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battery module

A battery module and battery unit technology, applied in the field of energy storage, can solve the problems of poor wettability of electrolyte, twisting and deformation of battery cells, and affecting battery cycle performance, so as to achieve excellent cycle performance, reduce expansion rate, and prevent distortion and deformation Effect

Active Publication Date: 2020-01-24
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] During the charging and discharging process of the single battery of the battery module, the electrode pole piece will expand in volume due to the different delithiation or lithium intercalation states of the active material. The volume expansion of the electrode pole piece will inevitably lead to stress in the single battery. These stresses cannot be effectively released, resulting in distortion and deformation of the battery core, which affects the cycle performance of the battery.
In addition, the volume expansion and distortion of the battery cell during the charging and discharging process lead to the locking of the internal interlayer gap, which will cause the wettability of the electrolyte to deteriorate and deteriorate the cycle performance of the battery.
This obviously cannot meet the increasingly higher requirements of the market for the cycle performance of battery modules in recent years.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Preparation of positive electrode sheet

[0081] The cathode active material LiNi 0.8 co 0.1 mn 0.1 o 2, conductive carbon black and binder polyvinylidene fluoride (PVDF) are dispersed in the solvent N-methylpyrrolidone (NMP) according to the weight ratio of 8:1:1, and stirred evenly to obtain the positive electrode slurry; the positive electrode slurry Evenly coated on the aluminum foil of the positive electrode current collector, after drying, cold pressing, slitting, and cutting into pieces, the positive electrode sheet is obtained.

[0082] Preparation of negative electrode sheet

[0083] Negative electrode active material artificial graphite, conductive carbon black, thickener carboxymethyl cellulose (CMC) and binder styrene-butadiene rubber (SBR) are dispersed in solvent deionized water according to the weight ratio 89:6:3:2, stir Evenly, the negative electrode slurry is obtained; the negative electrode slurry is evenly coated on the copper foil of the ne...

Embodiment 2～10

[0091] The difference from Example 1 is that the relevant parameters of the separator are adjusted, see Table 1 for details.

Embodiment 11

[0093] The difference from Example 2 is that a separator is provided between every two adjacent battery cells, each battery cell includes two single batteries, and the relevant parameters of the separator are adjusted, see Table 1 for details.

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Abstract

The invention discloses a battery module and belongs to the technical field of energy storage. The battery module includes: a frame, the frame has an accommodation space; a plurality of battery units, the plurality of battery units are sequentially arranged in the accommodation space of the frame along the thickness direction of the battery units; Separator, the separator has compressibility, and the compressibility δ of the separator under the pressure of 2MPa or less 1 Satisfy C 0 ×δ 1 ≤A 0 ×0.2, C 0 is the initial thickness of the separator, A 0 is the initial thickness of the battery cell. The battery module provided by the invention has excellent cycle performance.

Description

technical field [0001] The present application belongs to the technical field of energy storage, and in particular relates to a battery module. Background technique [0002] Batteries can convert chemical energy into electrical energy, have stable voltage and current, reliable performance, environmental friendliness, simple structure and easy portability, and have become the main power source of electric vehicles. In order to meet the requirements of high power and long-duration battery life, a battery module is usually composed of a plurality of single cells, or a battery pack is further composed of a plurality of battery modules. [0003] During the charging and discharging process of the single battery of the battery module, the electrode pole piece will expand in volume due to the different delithiation or lithium intercalation states of the active material. The volume expansion of the electrode pole piece will inevitably lead to stress in the single battery. These stre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/10H01M10/658H01M50/209H01M50/293
CPCH01M10/658H01M2220/20H01M50/209H01M50/293H01M10/0481H01M10/613H01M10/625H01M10/647H01M10/653Y02E60/10Y02P70/50H01M50/291H01M2200/10
Inventor 赵丰刚凃俊达陈小波沈聃王学辉
Owner CONTEMPORARY AMPEREX TECH CO