Recombinant lead-acid cell and long life battery

• US 5,593,796 A
• Filed: 05/18/1995
• Issued: 01/14/1997
• Est. Priority Date: 02/10/1992
• Status: Expired due to Fees

• Current Assignee: C&D Technologies Incorporated (Angel Holdings LLC)
• Original Assignee: C & D Charter Power Systems, Inc.
• Inventors: Wagner, Franz, Misra, Sudhan S.
• Primary Examiner(s): NUZZOLILLO, MARIA
• Application Number:
  US08/444,072
• Time in Patent Office: 607 Days
• Field of Search: 429/204, 429/218, 429/233, 429/237, 429/238, 429/241
• US Class Current: 429/204
• CPC Class Codes: B29C 65/02 by heating, with or without pressure
• CPC Class Codes: B29C 65/20 with direct contact, e.g. using "mirror"
• CPC Class Codes: B29C 65/48 using adhesives , i.e. using supplementary joining material; solvent bonding
• CPC Class Codes: B29C 65/7802 Positioning the parts to be joined, e.g. aligning, indexing or centring
• CPC Class Codes: B29C 66/1122 Single lap to lap joints, i.e. overlap joints B29C66/45, B29C66/472, B29C66/52272 take precedence
• CPC Class Codes: B29C 66/53461 joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies
• CPC Class Codes: B29C 66/542 joining hollow covers or hollow bottoms to open ends of container bodies
• CPC Class Codes: B29C 66/71 characterised by the composition of the plastics material of the parts to be joined welding bar compositions B29C65/125
• CPC Class Codes: B29C 66/72521 comprising corrugated cores
• CPC Class Codes: B29C 66/7254 honeycomb structures
• CPC Class Codes: B29C 66/7392 characterised by the material of at least one of the parts being a thermoplastic
• CPC Class Codes: B29C 66/8322 Joining or pressing tools reciprocating along one axis
• CPC Class Codes: B29K 2023/12 PP, i.e. polypropylene
• CPC Class Codes: B29K 2027/06 PVC, i.e. polyvinylchloride
• CPC Class Codes: B29L 2031/7146 Battery-cases
• CPC Class Codes: H01M 10/12 Construction or manufacture
• CPC Class Codes: H01M 10/16 Suspending or supporting electrodes or groups of electrodes in the case
• CPC Class Codes: H01M 10/342 Gastight lead accumulators H01M10/121 takes precedence
• CPC Class Codes: H01M 10/613 Cooling or keeping cold
• CPC Class Codes: H01M 10/647 Prismatic or flat cells, e.g. pouch cells
• CPC Class Codes: H01M 10/6557 : arranged between the cells
• CPC Class Codes: H01M 10/6562 : with free flow by convection only
• CPC Class Codes: H01M 10/6563 : with forced flow, e.g. by blowers
• CPC Class Codes: H01M 10/6566 : Means within the gas flow to guide the flow around one or more cells, e.g. manifolds, baffles or other barriers H01M10/6565 takes precedence
• CPC Class Codes: H01M 4/73 : for lead-acid accumulators, e.g. frame plates
• CPC Class Codes: H01M 50/103 : prismatic or rectangular H01M50/109, H01M50/11 take precedence
• CPC Class Codes: H01M 50/169 : by welding, brazing or soldering
• CPC Class Codes: H01M 50/209 : adapted for prismatic or rectangular cells H01M50/216 takes precedence
• CPC Class Codes: H01M 50/253 : adapted for specific cells, e.g. electrochemical cells operating at high temperature
• CPC Class Codes: H01M 50/466 : U-shaped, bag-shaped or folded
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries
• CPC Class Codes: Y02P 70/50 : Manufacturing or production processes characterised by the final manufactured product

Abstract

A lead-acid cell includes a case, positive and negative plates within the case, microporous separator material between adjacent plates and electrolyte in a starved amount, with the case having jar and covers joined by a weldment along overlapping cover and jars. The positive plates include a grid frame with an intermediate member extending between spaced apart generally peripheral portions of the frame, with pasted active material on the grid frame separated substantially into two portions by the intermediate member. Compressive force is adjustably continuously applied to the positive and negative plates within the case. The plates are suspended within the case at positions removed from the wall of the case, while plate growth is permitted in a manner that plate shorting is avoided.

Claims

1. A lead-acid cell comprising:

a. a case;

b. positive and negative plates within said case, at least one of said positive plates comprising;

i. a grid comprising;

(1) an outer peripheral member of polygonal cross-section;

(2) a plurality of elongated polygonal cross-section members extending between spaced apart portions of said peripheral member;

(3) said elongated polygonal cross-section members intersecting within said outer peripheral polygonal cross-section member to define an open lattice including adjacent lattice paste holding confinements offset from and communicating with one another transversely to said grid, for holding paste to form said grid;

(4) at least one intermediate member of polygonal cross section extending between spaced apart sections of said outer peripheral polygonal cross-section member and connecting said elongated polygonal cross-section members together at positions intermediate respective extremities thereof;

(5) said elongated polygonal cross-section members having common length sides;

(6) said polygon of said intermediate member having at least two more sides than polygons of said elongated members and

ii. pasted active material in said lattice; and

c. electrolyte within said case.

2. The lead-acid cell of claim 1 wherein said intermediate member extends between spaced apart portions of said peripheral member.

3. The lead-acid cell of claim 2 wherein said spaced apart peripheral portions between which said intermediate member extends are parallel.

4. The lead acid cell of claim 3 wherein said positive plate further comprises a second intermediate member connecting additional ones of said plurality of elongated polygonal cross-section members together at positions between respective extremities thereof, remotely from said first intermediate member.

5. The lead-acid cell according to claim 4 wherein said first and second intermediate members are parallel.

6. The lead-acid cell according to claim 4 wherein said first and second intermediate members are perpendicular.

7. The lead-acid cell of claim 4 wherein said elongated polygonal cross-section members extend in two different directions.

8. The lead acid cell of claim 7 wherein said directions are transverse to one another.

9. The lead acid cell of claim 8 wherein said intermediate member extends in one of said two different directions.

10. The cell of claim 9 wherein said intermediate member has cross sectional area at least twice that of said elongated polygonal cross-section members.

11. The cell of claim 10 wherein said intermediate member has cross sectional area at least about thrice that of said elongated polygonal cross-section members.

12. The cell of claim 10 wherein said intermediate member has cross sectional area about that of said peripheral polygonal cross-section member.

13. The cell of claim 10 wherein intermediate members and said peripheral polygonal cross-section members have planar surfaces parallel with said grid and define a grid plane.

14. The cell of claim 10 wherein said elongated polygonal cross-section members further comprise first and second pluralities disposed transversely to one another, members of said first plurality being of triangular cross section with bases of said triangles aligned with a grid plane defined by said outer peripheral polygonal cross-section member;

members of said second plurality being of diamond cross section with midpoints of said diamonds in said grid plane.

15. The cell of claim 10 wherein said intermediate members and peripheral polygonal cross-section members are hexagonal and said elongated polygonal cross-section members further comprise first and second pluralities of elongated members, disposed transversely to one another, members of said first plurality being of triangular cross section with bases of said triangles co-planar with said grid plane and extending transversely to the direction of adjacency of said lattice paste holding confinements;

members of said second plurality being of diamond cross section with midpoints of said diamonds in said grid plane and extending in the direction of adjacency of said paste holding confinements.

16. The cell of claim 15 wherein said elongated polygonal cross-section members defining said paste holding confinements offset from and communicating with one another transversely to said grid plane are adjacent in a first direction and said intermediate member(s) are transverse to said first direction.

17. A lead-acid cell comprising:

a. a case;

b. positive and negative plates within said case, at least one of said positive plates comprising;

i. a planar grid comprising;

(1) an outer peripheral member defining a grid plane;

(2) a plurality of elongated members extending between spaced apart portions of said peripheral member;

(3) said elongated members intersecting within said outer peripheral member to define an open lattice for holding paste to form said grid;

(4) intermediate member(s) of cross sectional area substantially at least twice that of said elongated members extending between spaced apart sections of said peripheral member in sufficient number for restraining corrosive growth of said grid to about five percent over a preselected time in direction of extension of said intermediate member(s); and

ii. pasted active material within said lattice; and

c. electrolyte within said case.

18. A grid adapted for fabrication of an electrochemically active plate for use in a lead-acid cell, comprising:

a. a plurality of elongated members defining a paste support lattice;

b. at least one reinforcing member connecting at least some of said plurality of elongated members together at positions intermediate respective extremities thereof;

c. a second reinforcing member connecting additional ones of said plurality of elongated members together at positions intermediate respective extremities thereof, remotely from said first reinforcing member, being of larger cross-section than said elongated past support members and being of larger cross-section than said elongated members;

d. said reinforcing members being of the same cross-sectional area;

e. said first and second reinforcing members being parallel;

f. said reinforcing member being transverse to said connected elongated members;

g. said elongated members extending in two different directions transverse to one another;

h. said reinforcing member extending in one of said two different directions;

i. said grid further including a peripheral reinforcing member extending around the grid outer periphery with said elongated members and said first and second reinforcing members terminating in said peripheral reinforcing member.

19. A grid adapted for fabrication of an electrochemically active plate for use in a lead-acid cell, comprising:

a. a plurality of elongated members defining a paste support lattice;

b. at least one reinforcing member connecting at least some of said plurality of elongated members together at positions intermediate respective extremities thereof;

c. a second reinforcing member connecting additional ones of said plurality of elongated members together at positions intermediate respective extremities thereof, remotely from said first reinforcing member.

20. The grid of claim 19 wherein said reinforcing member(s) is of larger cross-section that said elongated paste support members.

21. The grid according to claim 20 wherein said reinforcing members are of the same cross-sectional area.

22. The grid according to claim 21 wherein said first and second reinforcing members are parallel.

23. The grid according to claim 21 wherein said first and second reinforcing members are perpendicular.

24. The grid of claim 22 wherein said reinforcing member is transverse to said connected elongated members.

25. The grid of claim 21 wherein said elongated members extend in two different directions.

26. The grid of claim 25 wherein said directions are transverse to one another.

27. The grid cell of claim 26 wherein said reinforcing member extends in one of said two different directions.

28. The grid according to claim 27 wherein said grid further includes a peripheral reinforcing member extending around the grid outer periphery with said elongated members and said first and second reinforcing members terminating in said peripheral reinforcing member.

29. A lead-acid cell comprising:

a. a case;

b. positive and negative plates within said case, at least one of said positive plates comprising;

i. a grid comprising;

(1) an outer rectangular peripheral member of hexagonal cross-section;

(2) a first plurality of diamond cross-section elongated members extending in a first direction between first and second spaced apart portions of said peripheral member;

(3) alternating first and second pluralities of equilateral triangular cross-section elongated members extending in a second direction transversely to said first direction between third and fourth spaced apart portions of said peripheral member, said first and second pluralities of triangular cross section members having bases of their respective triangular cross sections co-planar and with vertices opposite from said bases respectively extending in opposite directions;

(4) intermediate members of the same hexagonal cross section as said peripheral member, having corresponding coplanar top and bottom surfaces therewith and extending between said separated spaced portions of said outer peripheral cross-section member intermediate respective extremities thereof to define rectangular grid subsections bounded by hexagonal cross section members;

(5) said hexagon, diamond and triangular shapes having common slant height along single slanted sides;

(6) planar surfaces of said hexagonal shape being co-planar with top and bottom vertices of said diamond shape and with said triangular vertices opposite from said triangle bases;

(7) said slant surfaces of said triangles being parallel with selected slant surfaces of said diamond and said hexagon shapes;

(8) said slant surfaces of said diamond shape being parallel with slant surfaces of said hexagon shape; and

(9) said elongated diamond cross-sectional members intersecting with said elongated triangular cross-section members of said respective pluralities within said grid subsections to define an open lattice of adjacent slant-sided outwardly opening paste holding confinements transversely offset from one another at said base plane of said triangular members and communicating with one another perpendicularly to said grid across said base plane of said triangular members, for holding paste to form said plate;

ii. pasted active material in said lattice; and

c. electrolyte within said case.

30. A grid for a lead acid cell plate, comprising:

a. an outer rectangular peripheral member of hexagonal cross-section;

b. a first plurality of diamond cross-section elongated members extending in a first direction between first and second spaced apart portions of said peripheral member;

c. alternating first and second pluralities of equilateral triangular cross-section elongated members extending in a second direction transversely to said first direction between third and fourth spaced apart portions of said peripheral member, said first and second pluralities of triangular cross section members having bases of their respective triangular cross sections co-planar and with vertices opposite from said bases respectively extending in opposite directions;

p1 d. intermediate members of the same hexagonal cross section as said peripheral member, having corresponding coplanar top and bottom surfaces therewith and extending between said separated spaced portions of said outer peripheral cross-section member intermediate respective extremities thereof to define rectangular grid subsections bounded by hexagonal cross section members;

e. said hexagon, diamond and triangular shapes having common slant height along single slanted sides;

f. planar surfaces of said hexagonal shape being co-planar with top and bottom vertices of said diamond shape and with said triangular vertices opposite from said triangle bases;

g. said slant surfaces of said triangles being parallel with selected slant surfaces of said diamond and said hexagon shapes;

h. said slant surfaces of said diamond shape being parallel with slant surfaces of said hexagon shape; and

i. said elongated diamond cross-sectional members intersecting with said elongated triangular cross-section members of said respective pluralities within said grid subsections to define an open lattice of adjacent slant-sided outwardly opening paste holding confinements transversely offset from one another at said base plane of said triangular members and communicating with one another perpendicularly to said grid across said base plane of said triangular members, for holding paste to form said plate.

31. A lead-acid cell comprising:

a. a case;

b. positive and negative plates within said case, at least one of said positive plates comprising;

i. a grid comprising;

(1) an outer peripheral member of first polygonal cross-section;

(2) a plurality of second polygonal cross-section members extending between spaced apart portions of said peripheral member;

(3) a plurality of third polygonal cross-section members extending between second spaced apart portions of said peripheral member;

(4) intermediate members of the same polygonal cross section as said peripheral member, extending between said spaced apart portions of said outer peripheral cross-section member to define grid subsections bounded by first polygonal cross section members; and

(5) said second and third polygonal cross-section members intersecting to define an open lattice of adjacent alternately outwardly opening paste holding confinements adjoiningly transversely offset from and communicating with one another perpendicularly to a plane defined by said peripheral member for holding paste to form said plate;

ii. pasted active material in said lattice confinements; and

c. electrolyte within said case.

32. The cell of claim 31 wherein said polygons of said first shape have more sides than polygons of said second and third shapes.

33. The cell of claim 31 wherein said polygons of said first shape have more sides than polygons of said second shape.

34. The cell of claim 31 wherein said polygons of said second shape have more sides than polygons of said third shape.

35. The cell of claim 32 wherein said polygons of said second shape have more sides than polygons of said third shape.

36. The cell of claim 31 wherein slant sides of at least some of said polygons are parallel.

37. The cell of claim 35 wherein slant sides of at least some of said polygons are parallel.

38. The cell of claim 37 wherein sides of at least some of said polygons are parallel.

39. The cell of claim 31 wherein said first, second and third polygons have different numbers of sides.

40. The cell of claim 39 wherein some slanting sides of at least some of said polygons are parallel.

41. The cell of claim 31 wherein said polygonal shapes have common slant height along planar sides.

42. A grid for a lead acid cell plate, comprising:

a. an outer peripheral member of first polygonal cross-section;

b. a plurality of second polygonal cross-section members extending between spaced apart portions of said peripheral member;

c. a plurality of third polygonal cross-section members extending between second spaced apart portions of said peripheral member;

d. intermediate members of the same polygonal cross section as said peripheral member, extending between said spaced apart portions of said outer peripheral cross-section member to define grid subsections bounded by first polygonal cross section members; and

e. said second and third polygonal cross-section members intersecting to define an open lattice of adjacent alternately outwardly opening paste holding confinements adjoiningly transversely offset from and communicating with one another transversely to a plane defined by said peripheral member for holding paste to form said plate.

43. The grid of claim 42 wherein said polygons of said first shape have more sides than polygons of said second and third shapes.

44. The grid of claim 42 wherein said polygons of said first shape have more sides than polygons of said second shape.

45. The grid of claim 42 wherein said polygons of said second shape have more sides than polygons of said third shape.

46. The grid of claim 43 wherein said polygons of said second shape have more sides than polygons of said third shape.

47. The grid of claim 42 wherein slant sides of at least some of said polygons are parallel.

48. The grid of claim 46 wherein slant sides of at least some of said polygons are parallel.

49. The grid of claim 48 wherein sides of at least some of said polygons are parallel.

50. The grid of claim 42 wherein said first, second and third polygons have different numbers of sides.

51. The grid of claim 50 wherein some slanting sides of at least some of said polygons are parallel.

52. The grid of claim 42 wherein said polygonal shapes have common slant height along planar sides.

53. A long-life, recombinant lead-acid cell comprising:

a. a longitudinally elongated case;

b. a plurality of longitudinally elongated positive and negative plates of substantially alternating polarities within said case, at least one of said positive plates comprising;

i. a grid comprising;

(1) an outer peripheral member of first cross-section;

(2) a plurality of smaller cross-section members extending between spaced-apart portions of said peripheral member and intersecting to define an open lattice of adjacent confinements for holding paste to form said plate;

(3) intermediate members of greater cross-section than said smaller members, extending between said spaced-apart portions of said peripheral member to define grid subsections bounded by said peripheral member, for resisting transverse flexure of said peripheral member as said plate grows due to corrosion;

ii. pasted active material in said lattice confinements;

c. microporous glass mat separators between adjacent ones of said plates of opposite polarities; and

d. electrolyte within said separators.

54. The cell of claim 53 wherein said intermediate members are closer to circular cross-section than are said smaller members.

55. The cell of claim 53 wherein said peripheral member is closer to circular cross-section than are said intermediate members.

56. The cell of claim 55 wherein said intermediate members are closer to circular cross-section than said smaller members.

57. The cell of claim 56 wherein said intermediate members are between about one and one-half and about four times the cross-sectional area of said smaller members.

58. The cell of claim 53 wherein said intermediate members are between about one and one-half and about four times the cross-sectional area of said smaller members.

59. The cell of claim 58 wherein said intermediate members extend transversely between said portions of said peripheral member.

60. The cell of claim 59 wherein said intermediate members are parallel with portions of said peripheral member.

61. The cell of claim 60 wherein said smaller cross-section members extend between spaced-apart portions of said peripheral member transversely.

62. The cell of claim 61 wherein said smaller cross-section members intersect one another transversely.

63. The cell of claim 58 wherein said confinements open alternately outwardly.

64. The cell of claim 58 wherein said confinements are adjoiningly transversely offset from one another.

65. The cell of claim 58 wherein said confinements communicate with one another transversely to a plane defined by said peripheral member.

66. The cell of claim 58 wherein said plates are planar and outer surfaces of said peripheral and intermediate members are planar and parallel with said plates and outer extremities of said smaller members are coplanar with said outer surfaces of said peripheral and intermediate members.

67. The cell of claim 62 wherein said peripheral, intermediate and smaller members have polygonal cross-sections.

68. The cell of claim 67 wherein said peripheral, intermediate and smaller members polygonal cross-sections are of first, second and third shapes respectively.

69. The cell of claim 68 wherein said polygons of said first shape have more sides than polygons of said second shape.

70. The cell of claim 69 wherein said polygons of said second shape have more sides than polygons of said third shape.

71. The cell of claim 68 wherein said polygons of said second shape have more sides than polygons of said third shape.

72. The cell of claim 70 wherein slant sides of at least some of said polygons are parallel.

73. The cell of claim 71 wherein slant sides of at least some of said polygons are parallel.

74. The cell of claim 68 wherein sides of at least some of said polygons are parallel.

75. The cell of claim 68 wherein said first, second and third polygons have different numbers of sides.

76. The cell of claim 75 wherein some slanting sides of at least some of said polygons are parallel.

77. The cell of claim 76 wherein said polygonal shapes have common slant height along planar sides.

78. The cell of claim 66 wherein said plates are vertically upstanding.

79. A grid for a lead acid cell plate adapted for use in a longlife, recombinant lead-acid cell, comprising:

a. an outer peripheral member of first cross-section;

b. a plurality of smaller cross-section members extending between spaced-apart portions of said peripheral member and intersecting to define an open lattice of adjacent paste-holding confinements for holding paste to form said plate;

c. intermediate members of greater cross-section than said smaller members, extending between said spaced-apart portions of said peripheral member to define grid subsections bounded by said peripheral member, for resisting transverse flexure of said peripheral member as said grid, after pasting to provide said plate, grows due to corrosion.

80. The grid of claim 79 wherein said intermediate members are closer to circular cross-section than are said smaller members.

81. The grid of claim 79 wherein said peripheral member is closer to circular cross-section than are said intermediate members.

82. The grid of claim 81 wherein said intermediate members are closer to circular cross-section than said smaller members.

83. The grid of claim 82 wherein said intermediate members are between about one and one-half and about four times the cross-sectional area of said smaller members.

84. The grid of claim 79 wherein said intermediate members are between about one and one-half and about four times the cross-sectional area of said smaller members.

85. The grid of claim 84 wherein said confinements open alternately outwardly.

86. The grid of claim 89 wherein said confinements are adjoiningly transversely offset from one another.

87. The grid of claim 90 wherein said confinements communicate with one another transversely to a plane defined by said peripheral member.

88. The grid of claim 79 wherein said peripheral, intermediate and smaller members have polygonal cross-sections.

89. The grid of claim 88 wherein said peripheral, intermediate and smaller members polygonal cross-sections are of first, second and third shapes respectively.

90. The grid of claim 89 wherein said polygons of said first shape have more sides than polygons of said second shape.

91. The grid of claim 90 wherein said polygons of said second shape have more sides than polygons of said third shape.

92. The grid of claim 90 wherein said polygons of said second shape have more sides than polygons of said third shape.

93. The grid of claim 90 wherein slant sides of at least some of said polygons are parallel.

94. The grid of claim 91 wherein slant sides of at least some of said polygons are parallel.

95. The grid of claim 89 wherein sides of at least some of said polygons are parallel.

96. The grid of claim 88 wherein said first, second and third polygons have different numbers of sides.

97. The grid of claim 96 wherein some slanting sides of at least some of said polygons are parallel.

98. The grid of claim 97 wherein said polygonal shapes have common slant height along planar sides.

99. The grid of claim 98 wherein said plates are vertically upstanding.