Electrode assembly and secondary battery

A technology of electrode components and secondary batteries, which is applied in the direction of electrode manufacturing, electrical components, battery components, etc., can solve problems affecting the energy density of batteries, achieve the effects of improving overall mechanical properties, increasing energy density, and preventing thermal runaway

CN112687831AActive Publication Date: 2021-04-20NINGDE AMPEREX TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-04-20

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Abstract

The invention provides an electrode assembly which comprises a first pole piece and a second pole piece which are alternately arranged, the first pole piece comprises first current collectors, and in the thickness direction of the electrode assembly, the electrode assembly comprises a first area, a second area and a third area from outside to inside; and the thicknesses of the first current collectors in the first region, the second region and the third region are sequentially reduced. The thickness of the first current collector in the first region of the electrode assembly is the largest, so that the overall mechanical property of the battery can be improved, the short-circuit failure of the battery when the battery is impacted is effectively reduced, and meanwhile, the deformation of the battery in the cycle process can be inhibited; the second region adopts the first current collector with the medium thickness to play a role in buffering and transition, so that the thickness space is provided to improve the energy density of the battery while the mechanical property of the battery is improved when the battery is impacted; and the third region adopts the thinner first current collector, so that more thickness space is provided for improving the energy density of the battery.
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Description

technical field

[0001] The disclosure relates to the field of secondary batteries, in particular to an electrode assembly and a secondary battery. Background technique

[0002] The negative current collector material in the secondary battery is usually copper foil, and the thickness of the copper foil has a great influence on the performance of the battery when it is impacted. If the secondary battery uses thicker copper foil, it can make the battery have better mechanical strength. When the battery is hit, the thick copper foil can effectively reduce the short-circuit failure caused by the generation of debris. In the event of a short circuit, the thick copper foil can divert the current more, the voltage will drop rapidly, reduce the heat generation of the battery, and prevent the battery from thermal runaway.

[0003] Although the use of thick copper foil can effectively improve the pass rate when impacted, it greatly affects the improvement of battery energy density. ...

Examples

Embodiment Construction

[0042] The drawings illustrate embodiments of the disclosure and it is to be understood that the disclosed embodiments are merely examples of the disclosure, which may be embodied in various forms and therefore specific details disclosed herein should not be construed as limiting. , but merely as a basis for the claims and as a representative basis for teaching one of ordinary skill in the art to variously employ the present disclosure.

[0043] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present disclosure. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be ...