Battery, battery module, battery pack and electric vehicle

By using a double-layer sealing structure of a metal shell and an encapsulation film in the battery pack, the problems of pole core movement and poor sealing effect are solved, the stability and safety of the battery are improved, and longer life and more efficient are achieved. Battery design.

Active Publication Date: 2021-07-30
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the above method directly encapsulates the pole core and the electrolyte in the battery case, once the case is damaged, the electrolyte will easily leak, and the sealing effect is poor.
[0004] In addition, in order to increase the capacity of the battery, multiple pole cores are connected in series in the battery case. Under the condition of vibration and bumps, the multiple pole cores are easy to move in the case, and the relative displacement between the pole cores will occur. , causing damage to the pole core, for example, the current collector is damaged, the diaphragm is wrinkled, the active material layer on the pole piece falls off, the stability of the battery is poor, and safety problems are prone to occur

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0056] Embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary, and are only for explaining the present application, and should not be construed as limiting the present application.

[0057] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Rear", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Axial", "Radial", "Circumferential" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the application and simplif...

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PUM

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Abstract

The invention provides a battery, a battery module, a battery pack and an electric vehicle. The battery comprises a metal shell and a plurality of pole core groups which are packaged in the metal shell and are sequentially arranged; the pole core groups are connected in series, and each pole core group comprises at least one pole core; the pole core groups are packaged in a packaging film; and the air pressure between the metal shell and the packaging film is lower than the air pressure outside the metal shell. The air pressure in the packaging film is lower than the air pressure between the metal shell and the packaging film, so that the sealing effect and the strength of the battery are improved.

Description

Technical Field [0001] This invention belongs to the field of batteries, and particularly relates to a battery, a battery module, a battery pack, and an electric vehicle. Background Technology [0002] Battery packs used in electric vehicles typically include multiple batteries to increase battery capacity; these batteries are installed inside the battery pack casing. [0003] Batteries require the addition of electrolyte during manufacturing, necessitating sealing to prevent leakage. Current technology typically involves directly sealing the electrode core within the casing, then injecting the electrolyte through an inlet on the casing. After injection, the inlet is sealed to obtain the battery. However, this method, by directly encapsulating the electrode core and electrolyte within the battery casing, makes it susceptible to leakage if the casing is damaged, resulting in poor sealing. [0004] In addition, to increase battery capacity, multiple electrode cores are connect...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H01M50/103H01M50/129H01M50/51H01M50/209H01M50/249H01M50/186
CPCH01M2220/00Y02T10/70H01M50/209H01M2220/20H01M50/224H01M50/24H01M50/231B32B7/12B32B27/36B32B2307/7244B32B2307/7246B32B2457/10B32B2270/00B32B2307/31B32B27/34B32B7/027B32B27/08B32B27/32Y02E60/10H01M50/242H01M50/249H01M50/51H01M50/229H01M50/244B32B15/08B32B15/20C09J2423/00H01M50/186H01M50/529H01M50/119H01M50/103H01M50/451H01M50/317H01M10/0413
OwnerBYD CO LTD