| CPC H01M 50/30 (2021.01) [H01M 50/124 (2021.01); H01M 50/183 (2021.01); H01M 50/3425 (2021.01); H01M 2220/20 (2013.01)] | 18 Claims |
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1. A battery pack, comprising:
a module, and
a container storing the module, wherein
the module includes one or more cell pairs;
each of the one or more cell pairs includes a first cell and a second cell,
the second cell is adjacent to the first cell,
the second cell is electrically connected to the first cell,
the first cell includes an exterior package, an electrode assembly, and an electrode terminal,
the exterior package includes a laminate film,
the laminate film includes a resin layer and a metal layer,
the resin layer covers the metal layer,
the resin layer includes a first thermoplastic resin,
the exterior package includes a storage portion storing the electrode assembly,
a sealing portion is formed at a peripheral edge of the exterior package,
the electrode terminal is connected to the electrode assembly,
the electrode terminal extends through the sealing portion and is drawn from inside of the exterior package to outside of the exterior package,
the electrode terminal has a flat plate shape,
the electrode terminal includes a first main surface and a second main surface,
the first main surface is oriented in a direction of the second cell,
the second main surface is a surface opposite to the first main surface,
the sealing portion includes a first region, a second region, and a third region,
the first region is formed between the first main surface and the resin layer,
the second region is formed between the second main surface and the resin layer,
the third region is formed between portions of the resin layer,
the second region includes a fracture promoting portion,
the fracture promoting portion is configured to, in response to at least one of temperature or internal pressure of the first cell increasing, be more likely to be fractured than the first region and the third region,
the electrode terminal is configured to, after the fracture promoting portion is fractured, maintain an electrical connection with the electrode assembly,
the battery pack is configured not to allow gas from the fracture promoting portion to flow to the storage portion of the second cell,
an exhaust duct is formed inside the container,
the fracture promoting portion is disposed inside the exhaust duct, and
the storage portion is disposed outside the exhaust duct.
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