Separation method of secondary battery
AssigneePanasonic EV Energy Co., Ltd.
InventorsToshiaki Nakanishi, Shuhei Marukawa
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Abstract
A method for disassembling a battery pack to separate a secondary battery which can be reused, without impairing the performance of a secondary battery, having remaining life which, constitutes the battery pack. A pair of holding plates is brought into contact with binding plates on both ends of a battery pack to compress the battery pack in the stacking direction. The open circuit voltage before and after the compression is measured, and based on an amount of change of the open circuit voltage before and after compression, a battery pack which can be reused is separated.
Claims3
A separation method of a secondary battery for disassembling and separating a battery pack which is integrated by sandwiching a plurality of stacked secondary batteries by a pair of binding plates on both ends thereof and binding the whole battery pack with a coupling member coupled to the binding plates, so as to re-form a new battery pack,
- the method comprising the steps of:
- measuring an open circuit voltage of each of the secondary batteries while retaining a binding state by means of the pair of binding plates of the battery pack;
- compressing the battery pack in the stacking direction to a dimension of the battery pack at the time of design, while maintaining the pair of binding plates being parallel to each other;
- measuring the open circuit voltage of the secondary battery in a state in which the battery pack is compressed;
- and
- separating a secondary battery which can be reused for re-forming a battery pack, based on an amount of change of the open circuit voltage of the secondary battery before and after the compression of the battery pack in the binding state.
Dependencies are inferred from the claim text.