Battery pack and method of producing the same
First Claim
1. (Amended) 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.
1 Assignment
0 Petitions
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.
49 Citations
34 Claims
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1. (Amended) 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. - View Dependent Claims (2, 3, 4, 5, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21, 22)
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6. (Deleted)
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14. (Deleted)
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23. A method of manufacturing a battery pack comprising the steps of:
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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 the step (a);
(c) connecting connection leads to a positive electrode and a negative electrode of a battery cell, respectively; and
(d) electrically connecting each of said connection leads on said printed circuit board, after the step (c). - View Dependent Claims (24, 25)
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26. A method of manufacturing a battery pack comprising the steps of:
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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 the 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 of a battery cell, respectively, after the step (c). - View Dependent Claims (27, 28)
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29. A method of manufacturing a battery pack comprising the steps of:
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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 of a battery cell, respectively, after the 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 the step (c). - View Dependent Claims (30, 31)
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32. A method of manufacturing a battery pack comprising the steps of:
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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 and a negative electrode on said printed circuit board, respectively, after the step (a);
(c) connecting said connection leads with a positive electrode and a negative electrode of a battery cell, respectively; and
(d) heat-treating said battery cell and said printed circuit board, after the step (c). - View Dependent Claims (33, 34)
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Specification