Battery pack and method of producing the same
DCFirst Claim
1. A battery pack comprising:
- a battery cell; and
a protection circuit unit for protecting said battery cell from overcurrent or overheating, wherein;
said protection circuit unit is an integrated body containing a protection IC and a printed circuit board mounted with a surface-mount type PTC thermistor,a heat conductive member thermally coupling said battery cell and said PTC thermistor member, and said heat conductive member is a soldering metal or a metal alloy whose melting point is 300°
C. or lower.
1 Assignment
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Accused Products
Abstract
The protection circuit unit 52 is an integrated body comprising a surface-mount type PTC thermistor 49 mounted by a soldering on a printed circuit board 44 through reflow soldering or the like soldering method together with a protection IC 45 and a FET unit 46. The surface-mount type PTC thermistor 49, as compared with a PTC thermistor with leads, can be mounted readily on the printed circuit board 44, without requiring bending and welding work of a lead to be connected to a negative terminal of prismatic battery cell 41, for forming a circuit. As a result, change in a resistance due to a bending stress, a thermal stress, etc. can be eliminated. Furthermore, a degree of thermal coupling with the battery cell 41 can be adjusted by changing a location of the thermistor 49. Thus, varieties of control functions can be implemented.
37 Citations
28 Claims
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1. A battery pack comprising:
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a battery cell; and a protection circuit unit for protecting said battery cell from overcurrent or overheating, wherein; said protection circuit unit is an integrated body containing a protection IC and a printed circuit board mounted with a surface-mount type PTC thermistor, a heat conductive member thermally coupling said battery cell and said PTC thermistor member, and said heat conductive member is a soldering metal or a metal alloy whose melting point is 300°
C. or lower. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of manufacturing a battery pack comprising:
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(a) soldering a protection IC and a surface-mount type PTC thermistor on a printed circuit board; (b) heat-treating said printed circuit board after step (a); (c) connecting connection leads to a positive electrode and a negative electrode respectively, of a battery cell; and (d) electrically connecting each of said connection leads. - View Dependent Claims (18, 19)
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20. A method of manufacturing a battery pack comprising:
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(a) soldering a protection IC and a surface-mount type PTC thermistor on a printed circuit board; (b) heat-treating said printed circuit board after step (a); (c) electrically-connecting connection leads for a positive electrode and a negative electrode on said printed circuit board; and (d) connecting said connection leads to a positive electrode and a negative electrode, respectively, of a battery cell after step (c). - View Dependent Claims (21, 22)
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23. A method of manufacturing a battery pack comprising:
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(a) soldering a protection IC and a surface-mount type PTC thermistor on a printed circuit board; (b) connecting connection leads to a positive electrode and a negative electrode, respectively, of a battery cell after step (a); (c) electrically connecting each of said connection leads on said printed circuit board; and (d) heat treating said battery cell and said printed circuit board, after step (c). - View Dependent Claims (24, 25)
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26. A method of manufacturing a battery pack comprising:
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(a) soldering a protection IC and a surface-mount type PTC thermistor on a printed circuit board; (b) electrically connecting connection leads for a positive electrode, respectively, and a negative electrode on said printed circuit board after step (a); (c) connecting said connection leads with a positive electrode and a negative electrode, respectively, of a battery cell; and (d) heat-treating said battery cell and said printed circuit board, after step (c). - View Dependent Claims (27, 28)
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Specification