Battery state detection apparatus and method for manufacturing same

• US 10,082,542 B2
• Filed: 05/28/2014
• Issued: 09/25/2018
• Est. Priority Date: 06/20/2013
• Status: Active Grant

• Current Assignee: Furukawa Automotive Systems Incorporated (Furukawa Electric Company Limited), Furukawa Electric Company Limited
• Original Assignee: Furukawa Automotive Systems Incorporated (Furukawa Electric Company Limited), Furukawa Electric Company Limited
• Inventors: Tanaka, Kazuyuki, Takeuchi, Haruhiko, Aburaya, Kengo
• Primary Examiner(s): PELTON, NATHANIEL R
• Application Number:
  US14/900,119
• Publication Number:
  US 20160139209A1
• Time in Patent Office: 1,581 Days
• Field of Search: 324426
• CPC Class Codes: B23K 20/10 making use of vibrations, e.g. ultrasonic welding
• CPC Class Codes: B29C 65/08 using ultrasonic vibrations non-plastics element to plastics elements B29C65/645
• CPC Class Codes: B29C 66/12821 comprising at least two overlap joint-segments
• CPC Class Codes: B29C 66/12841 comprising at least two butt joint-segments
• CPC Class Codes: B29C 66/1286 comprising at least one bevelled joint-segment
• CPC Class Codes: B29C 66/3022 said melt initiators being integral with at least one of the parts to be joined
• CPC Class Codes: B29C 66/322 Providing cavities in the joined article to collect the burr
• CPC Class Codes: B29C 66/542 joining hollow covers or hollow bottoms to open ends of container bodies
• CPC Class Codes: B29C 66/73921 characterised by the materials of both parts being thermoplastics
• CPC Class Codes: B29C 66/8322 Joining or pressing tools reciprocating along one axis
• CPC Class Codes: B29L 2031/3425 Printed circuits
• CPC Class Codes: B29L 2031/3481 Housings or casings incorporating or embedding electric or electronic elements
• CPC Class Codes: G01R 1/04 Housings; Supporting members; Arrangements of terminals
• CPC Class Codes: G01R 1/203 Resistors used for electric measuring, e.g. decade resistors standards, resistors for comparators, series resistors, shunts resistors in general H01C; microwave or radiowave terminations H01P1/26; coupling devices H01R
• CPC Class Codes: G01R 31/364 Battery terminal connectors with integrated measuring arrangements
• CPC Class Codes: G01R 31/3644 Constructional arrangements
• CPC Class Codes: H01M 10/4285 Testing apparatus
• CPC Class Codes: H01M 10/48 Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A battery state detection device includes a casing (8) and a lid part (24). The casing (8) includes a board storage space (23) that stores a circuit board. The casing (8) includes an open mouth through which one side of the board storage space (23) is opened. The lid part (24) closes the open mouth of the casing (8). The lid part (24) is provided with a tapered surface (77). The casing (8) is provided with a contact portion (78) that can be in contact with the tapered surface (77). In a state where the tapered surface (77) and the contact portion (78) are in contact with each other, ultrasonic welding between the casing (8) and the lid part (24) is performed.

Claims

1. A battery state detection device comprising:

a circuit board that detects a current;

a casing with a board storage space formed therein, the board storage space storing the circuit board, the casing including an open mouth through which one side of the board storage space is opened;

a lid part that closes the open mouth of the casing; and

a shunt resistor, wherein

a welded portion is formed along an edge portion of the open mouth, the welded portion being a portion in which the casing and the lid part are connected to each other by welding,

the circuit board detects a current having flowed through the shunt resistor,

the storage space of the casing stores the circuit board,

a plurality of anti-rattling pins is provided in the storage space of the casing, each anti-rattling pin of the plurality of anti-rattling pins includes;

a tapered portion having a tapered shape, the tapered portion being formed at the distal end of the anti-rattling pin; and

a plurality of crash ribs each having a rib-like shape starting from a position located at a proximal side relative to the tapered portion and extending in a longitudinal direction of the anti-rattling pin,

each of the plurality of crash ribs has a tapered shape that flares out toward the proximal side of the anti-rattling pin, and

the circuit board has a reception hole that receives the anti-rattling pin.

2. The battery state detection device according to claim 1, wherein

the casing has a first wall surface arranged inside the welded portion,

the lid part has a second wall surface arranged inside the welded portion, the second wall surface being opposed to the first wall surface,

an in-casing burr storage space is provided between the first wall surface and the second wall surface,

the in-casing burr storage space is in communication with the welded portion.

3. The battery state detection device according to claim 2, wherein

the casing or the lid part is provided with a burr receiver that is opposed to an end portion of the in-casing burr storage space.

4. The battery state detection device according to claim 1, wherein

the lid part has a third wall surface arranged outside the welded portion,

the casing has a fourth wall surface arranged outside the welded portion, the fourth wall surface being opposed to the third wall surface,

an out-of-casing burr storage space is provided between the third wall surface and the fourth wall surface,

the out-of-casing burr storage space is in communication with the welded portion.

5. The battery state detection device according to claim 1, wherein

The plurality of anti-rattling pins include a position settlement pin and a rotation restriction pin,

the circuit board has:

a position settlement hole that receives the position settlement pin; and

a rotation restriction hole that receives the rotation restriction pin,

the rotation restriction hole is an elongated hole elongated along a straight line connecting the rotation restriction hole to the position settlement hole.

6. The battery state detection device according to claim 1, wherein

a plurality of board fixing ribs are provided on a wall surface of the casing, the plurality of board fixing ribs coming into contact with the circuit board, the contact occurring from the proximal side of an anti-rattling pin from the plurality of anti-rattling pins.

7. The battery state detection device according to claim 6, wherein

an anti-warp rib is provided on the wall surface of the casing, the anti-warp rib being arranged between the board fixing ribs,

with respect to the longitudinal direction of the anti-rattling pin, a distal end portion of the anti-warp rib is positioned closer to the proximal side than a distal end portion of each of the board fixing ribs is.

8. The battery state detection device according to claim 1, comprising a board connection terminal that connects the shunt resistor to the circuit board, wherein

the casing is provided with a partition wall that separates the storage space and the shunt resistor from each other,

the partition wall has a terminal pass-through hole that allows the board connection terminal to pass therethrough,

the terminal pass-through hole is filled with a sealant.

9. The battery state detection device according to claim 8, wherein

a filling amount checker in the form of a recess is provided in the partition wall,

the filling amount checker is in communication with the terminal pass-through hole, the filling amount checker having a depth less than the depth of the terminal pass-through hole.

10. The battery state detection device according to claim 8, wherein

an edge portion of the terminal pass-through hole has a beveled contour.

11. A method for manufacturing a battery state detection device, the battery state detection device comprising:

a circuit board that detects a current;

a casing with a board storage space formed therein, the board storage space storing the circuit board, the casing including an open mouth through which one side of the board storage space is opened;

a lid part that closes the open mouth of the casing; and

a shunt resistor,

the method including a welding step of performing ultrasonic welding between the casing and the lid part in a state where a tapered surface provided in one of the casing and the lid part is in contact with a contact portion provided in the other of the casing and the lid part, the contact portion being brought into contact with the tapered surface, wherein

in the welding step, the ultrasonic welding is performed with an anti-deformation jig arranged along an outer peripheral wall surface of the casing, and wherein

the circuit board detects a current having flowed through the shunt resistor,

the storage space of the casing stores the circuit board,

a plurality of anti-rattling pins is provided in the storage space of the casing, each anti-rattling pin of the plurality of anti-rattling pins includes;

a tapered portion having a tapered shape, the tapered portion being formed at the distal end of the anti-rattling pin; and

a plurality of crash ribs each having a rib-like shape starting from a position located at a proximal side relative to the tapered portion and extending in a longitudinal direction of the anti-rattling pin,

each of the plurality of crash ribs has a tapered shape that flares out toward the proximal side of the anti-rattling pin, and

the circuit board has a reception hole that receives the anti-rattling pin.

12. The method for manufacturing a battery state detection device according to claim 11, wherein

the contact portion is provided in the casing,

the casing has a first wall surface facing inward, the first wall surface being arranged inside the contact portion,

the tapered surface is provided in the lid part,

the lid part has a second wall surface facing outward, the second wall surface being arranged inside the tapered surface,

in the welding step, a predetermined gap is formed between the first wall surface and the second wall surface in the state where the tapered surface and the contact portion are in contact with each other.