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Battery cell structure, secondary battery, battery pack and power utilization device

A technology for secondary batteries and battery packs, applied in secondary batteries, battery electrodes, structural parts, etc., can solve the problems of poor consistency of pole pieces, unstable pole piece performance, etc., to reduce low temperature and low SOC, improve safety performance, cost reduction effect

Pending Publication Date: 2022-07-22
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the purposes of the present invention is to provide a battery structure for the deficiencies of the prior art, which solves the problem of poor consistency of pole pieces when lithium iron phosphate is mixed with ternary materials to make active materials, and the problem of coating on the surface of the same pole piece When covering two layers of different active material layers, the performance of the pole piece is unstable

Method used

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  • Battery cell structure, secondary battery, battery pack and power utilization device
  • Battery cell structure, secondary battery, battery pack and power utilization device

Examples

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Embodiment 1

[0042]In the prior art, the mixed use of ternary material and lithium iron phosphate material is prone to poor consistency, and the mixed use of ternary material coating layer and lithium iron phosphate material coating layer is prone to instability. The primary material and the lithium iron phosphate material are separately produced, and two different positive electrode sheets are used in the same cell structure, so that the cell structure retains the advantages of the ternary material and the advantages of lithium iron phosphate. The two work together to improve the cell. performance. Specifically, as figure 1 As shown, a cell structure of the present invention includes a first cell unit, a second cell unit and a cell membrane 3, and the cell membrane 3 is arranged on the first cell unit and the second cell Between the cells, the first cell unit is provided with several first cell groups 1, the first cell group 1 sequentially includes a first positive electrode sheet 11, a ...

Embodiment 2

[0045] like figure 2 As shown in the figure, a cell structure of the present invention includes a first cell unit, a second cell unit and a cell diaphragm 3, and the cell diaphragm 3 is arranged on the first cell unit and the second cell Between the cells, the first cell unit is provided with several first cell groups 1, the first cell group 1 sequentially includes a first positive electrode sheet 11, a first diaphragm 12 and a first negative electrode sheet 13, and a second cell unit It includes two second cell groups 2 arranged in sequence, and the second cell group 2 includes a second positive electrode sheet 21 , a second diaphragm 22 and a second negative electrode sheet 23 in sequence, and between two adjacent second cell groups 2 Three first cell groups 1 are provided. The first positive electrode sheet 11 uses a ternary active material, the second positive electrode sheet 21 uses a lithium iron phosphate active material, and the lithium ion content in the first posit...

Embodiment 3

[0047] The difference from the first embodiment is that the quantity ratio of the first positive electrode sheet 11 to the second positive electrode sheet 21 is 90:10.

[0048] The rest are the same as those in the first embodiment, and are not repeated here.

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Abstract

The invention belongs to the technical field of secondary batteries, and particularly relates to a battery cell structure, a secondary battery, a battery pack and a power utilization device, and the battery cell structure comprises a first battery cell unit which comprises a first positive plate; the second battery cell unit comprises a second positive plate; the unit diaphragm is arranged between the first battery cell unit and the second battery cell unit; wherein the first positive plate and the second positive plate are respectively made of different positive active materials. The battery cell structure and the secondary battery have the advantages of high specific capacity, high energy density, excellent cycle performance and good needling and overcharge performance.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a battery core structure, a secondary battery, a battery pack and an electrical device. Background technique [0002] In the field of lithium-ion batteries, ternary materials have been widely used due to their high specific capacity, high energy density, relatively low cost, and excellent cycle performance. However, its safety performance is relatively poor compared to lithium iron phosphate, and the acupuncture and overcharge indicators are relatively difficult. In order to make comprehensive use of the advantages of the two, one of the methods commonly used at present is to mix lithium iron phosphate and ternary materials in proportion and coat them during mixing. The other is to coat the two materials in layers on the current collector, which is divided into a first active material layer and a second active material layer. The disadvantages of using t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0585H01M4/131H01M4/136
CPCH01M10/0525H01M10/0585H01M4/131H01M4/136H01M2220/30H01M2220/10H01M2220/20Y02E60/10
Inventor 刘飞武冬冬金敏
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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