Regional design pole piece and battery provided with pole piece

A regionalization and pole piece technology, applied in the direction of secondary battery, battery pack components, secondary battery repair/maintenance, etc., can solve the problem of reducing battery, difficult to reduce battery ion current or electronic current, and internal short circuit Problems such as the partition of the surrounding electrode area can be solved to achieve the effect of improving safety and reducing the heating rate

Pending Publication Date: 2019-06-21
何志奇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of the above methods can effectively isolate the internal short-circuit point from the surrounding electrode area, and it is difficult to reduce the ionic current or electronic current of the battery as a whole, and it is also difficult to control the magnitude of the current rushing to the internal short-circuit point. Reduce the danger of the battery, especially the internal short circuit of the power battery

Method used

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  • Regional design pole piece and battery provided with pole piece
  • Regional design pole piece and battery provided with pole piece
  • Regional design pole piece and battery provided with pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A lithium-manganese dioxide battery.

[0056] Such as figure 1 As shown, the negative electrode current collector consists of a perforated conductive plate 1 . The main function of the conductive plate 1 is to conduct electronic current, and the material of the conductive plate 1 can be any one or a combination of metal materials, PTC materials, and conductive polymers. In this embodiment, the conductive plate 1 is a stainless steel foil, on which an oblong hole 2 is punched. The area surrounded by the oblong holes 2 forms the conductive plate area block 3; the distance between the adjacent oblong holes 2 is 0.1 mm to 50 mm, preferably 3 mm, and the uncut holes between the adjacent oblong holes 2 part, it forms the electronic current-limiting part between the adjacent area blocks. In this embodiment, the electronic current limiting part is integrally connected with the area block.

[0057] Such as figure 2 , image 3 ( image 3 is along figure 2 As shown in th...

Embodiment 2

[0065] A lithium-manganese dioxide battery.

[0066] The battery structure and preparation process are basically the same as in Example 1, the difference is that: Figure 4 , Figure 5 ( Figure 5 is along Figure 4 As shown in the cross-sectional view at the dotted line), a thermal insulation layer 6 and a liquid barrier layer 5 are coated in sequence at the adjacent positions between the conductive plate area blocks 3 (including the electronic current limiting part and slightly expanded). The main function of the heat insulating layer 6 is to insulate heat, slowing down the heat loss of the electronic current limiting part when it is blown; the main function of the liquid barrier layer 5 is to isolate the electrolyte. The components of the heat insulation layer 6 and the liquid barrier layer 5 are both aluminum oxide (Al2O3) + acrylic glue. The aluminum oxide content in the thermal insulation layer 6 is higher than that of the liquid barrier layer 5, and the thermal insu...

Embodiment 3

[0068] A lithium-manganese dioxide battery.

[0069] The battery structure and preparation process are basically the same as in Example 2, the difference is that: Image 6 , Figure 7 ( Figure 7 is along Image 6 As shown in the cross-sectional view at the dotted line), in addition to the oblong hole 2 on the conductive plate 1, there are thinned areas 7, large round holes 8, and small round holes 9 on the conductive plate. The oblong hole 2, the conductive plate thinning area 7, and the large circular hole 8 jointly form the electronic current limiting part between the conductive plate area blocks 3; the small circular hole 9 is conducive to the pressing of the lithium strip.

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Abstract

The invention relates to the field of battery design technologies and discloses a regional design pole piece and a battery provided with the pole piece. Regional design is adopted for a positive polepiece and a negative pole piece of the battery. The pole piece comprises a current collector and electrode materials arranged at the two sides of the current collector. The current collector comprisesat least one conductive plate with conducted electrons, wherein each conductive plate is dived into multiple regional blocks, and an electron current limiting part capable of being fused to limit a current is arranged between the adjacent regional blocks. Accordingly, each electrode material also can be divided into multiple regional blocks. Each electron current limiting part is provided with aliquid isolation layer, a heat isolation layer and a containing layer which are used for promoting smooth progress of fusing. A layer of insulation material is arranged between the adjacent regional blocks. Structural parts connected with all the regional blocks are arranged in the pole piece, so that the mechanical strength of the pole piece is improved. Through the pole piece, electron mutual conduction in the regional blocks of the conductive plates and the regional blocks of the electrode materials in case of an internal short circuit can be limited, therefore, an internal short-circuit current of the battery is remarkably lowered, and disastrous problems such as combustion and explosion are avoided.

Description

technical field [0001] The invention relates to the technical field of battery design, in particular to a regionally designed pole piece and a battery composed of the pole piece. Background technique [0002] During the safety test and actual use of lithium-ion batteries, internal short circuits are prone to occur between the positive and negative electrodes, resulting in fire, combustion, and explosion, causing safety accidents. In order to improve the safety of lithium-ion batteries, the usual design method is to take corresponding measures on the casing, electrolyte, diaphragm, and electrodes to block or reduce short circuits. For example, CN2762362Y proposes setting safety valves, fuses or thermistors on the battery case; CN1145233C proposes PTC electrode technology. However, none of the above methods can effectively isolate the internal short-circuit point from the surrounding electrode area, and it is difficult to reduce the ionic current or electronic current of the ...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M2/34H01M10/0525H01M10/42H01M50/583
CPCY02E60/10H01M4/13H01M10/0525H01M10/42H01M50/583
Inventor 何志奇
Owner 何志奇
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