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Safety and large-capacity lithium ion battery

A lithium-ion battery, high-capacity technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problem of difficulty in manufacturing core packs to dissipate heat, and achieve the effect of low cost and simple structure

Pending Publication Date: 2017-10-03
庄新国
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, in the present invention, it is hoped that a plurality of small-sized and small-capacity battery cell packs are connected in parallel to form a battery cell pack through a current-limiting connector, and each battery cell pack is separated by a heat-conducting separator to solve the problem of large-capacity lithium-ion batteries. Difficult to manufacture a single large-size core pack for batteries, heat dissipation and safety issues

Method used

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  • Safety and large-capacity lithium ion battery
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  • Safety and large-capacity lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In order to illustrate the present invention, a 450Ah lithium ion battery was made in this embodiment, and the shape is as figure 1 Shown. Lithium-ion battery cathode materials usually use LiFePO 4 , LiNiCoMnO 2 , LiNiCoAlO 2 , LiMn 2 O 4 , LiCoO2, or a mixture of two of them, the anode material uses C, Li 4 T i5 O 12 , Si or its compound, Sn or its compound, the electrolyte adopts 1.2MLiPF 6 +EC+EMC, the diaphragm adopts PE film, PP film, PP / PE film, coated with SiO 2 Or Ai 2 O 3 PE composite film.

[0025] Pre-made belt The injection hole 109, equipped with The aluminum positive pole cover plate 106 of the aluminum positive pole 107; The aluminum negative electrode end cover 112 of the copper negative pole 113; the aluminum and copper current limiting connectors 105 are made of 2mm thick aluminum sheet and 1mm copper sheet, respectively; 48×405mm is made of 2mm thick aluminum sheet, with 2 Thermally conductive separator 108 with through-hole 501; 225×410mm battery shel...

Embodiment 2

[0030] Make 450Ah lithium-ion battery, looks like figure 1 Shown. Except that the small core pack adopts a winding rectangular parallelepiped structure, the other battery materials, methods and dimensions are the same as those of Example 1. The coating width and smooth edge width of the positive and negative plates are the same as in Example 1. The positive and negative pole pieces of the entire roll are respectively cut into 377mm and 378mm wide positive and negative pole piece rolls, and the entire roll of separator is cut into 368mm wide. Diaphragm sheet roll; use a winding machine to roll into a core with a thickness of 8mm, a length of 388mm, and a width of 72mm. The six cores are ultrasonically welded, or laser welded, or riveted to connect the positive and negative sides of the core respectively. As a whole, a small core pack 104 with a winding rectangular parallelepiped structure is made; using the same method as in Example 1, three small core packs 104 are connected in...

Embodiment 3

[0032] Using the battery made in Example 1, after the battery is fully charged, an external short circuit test of the battery is performed with a wire. The result of the experiment is that the battery is safe. After disassembling the battery, it can be seen that the aluminum current-limiting connector 105 is fused, indicating that the current-limiting connector 105 plays a role of current limiting. .

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PUM

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Abstract

The invention provides a safety and large-capacity lithium ion battery. The safety and large-capacity lithium ion battery adopts a small core package, multiple small core packages are connected in parallel through a current-limiting connecting piece so as to form a battery core package, the small core packages are separated by heat-conducting partitions; the core package is simple in manufacturing by using the small core packages, the heat conducting partition deduces the internal heat of the battery and reinforces a battery structure, the current-limiting connecting piece prevents each small core package from over-current charging or discharging to influence the security of the battery; therefore, the monomer lithium ion battery manufactured through the invention has safety, high-capacity and high-power electrical property, and the formed battery system is simple in structure, safe, reliable and low in cost.

Description

Technical field [0001] The invention relates to the field of lithium ion battery manufacturing, in particular to a safe and large-capacity lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles, energy storage and other fields. These application fields require lithium-ion batteries with safety, high energy and high power performance, and simple battery structures. [0003] Usually, a number of small-capacity lithium-ion battery cells are connected in parallel to form a large-capacity lithium-ion battery block in external parallel and then connected in series, or the lithium-ion battery cells are connected in series and then clusters are connected in parallel to meet the requirements of large The needs of energy electric vehicles and energy storage systems. Multiple lithium-ion batteries are connected in parallel. Due to the inconsistent performance of each lithium-ion battery and only one voltage measurement position, when th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M2/10H01M10/6555H01M10/613
CPCH01M10/0525H01M10/613H01M10/6555H01M50/20Y02E60/10
Inventor 庄新国
Owner 庄新国
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