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Battery, and positive electrode plate and roll core thereof

A positive electrode sheet and electrode sheet technology, which is applied in the direction of non-aqueous electrolyte battery electrodes, secondary batteries, and battery pack components, can solve problems such as limiting the use of lithium-ion batteries, unfavorable normal use of equipment, and heating on the surface of batteries. To achieve the effect of reducing internal resistance, reducing the rise, and reducing ohmic polarization

Inactive Publication Date: 2019-07-26
佛山市实达科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, when charging with high current, the surface of the battery cell will heat up seriously, the temperature rises obviously, and there are safety problems at the same time.
Therefore, low current and long-term charging seriously limit the use of lithium-ion batteries, such as emergency medical equipment, electric vehicles, communications, aerial photography, etc. Long-term charging is not conducive to the normal use of equipment

Method used

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  • Battery, and positive electrode plate and roll core thereof
  • Battery, and positive electrode plate and roll core thereof
  • Battery, and positive electrode plate and roll core thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A positive electrode sheet of a battery, such as figure 1 and figure 2 As shown, it includes a pole piece 1 and a pole piece 2, the number of the pole piece 1 is one, the pole piece 1 is located in the middle of the pole piece, and the front side of the pole piece 2 is connected to the first active layer 21, so The back side of the pole sheet 2 is connected with the second active layer 22, the first 21 and the second active layer 22 are composed of positive electrode active materials, and the surface density of the positive electrode sheet is 160 ~ 220g / m 2 . There is a tab 1 on the positive electrode sheet, and a main installation position 3 and a sub-installation position 4 are arranged in the middle of the pole piece 2, the main installation position 3 and the sub-installation position 4 are adjacently arranged, and the tab 1 is installed in one of the main installation position 3 and the auxiliary installation position 4, and the pole piece 2 is not coated with a...

Embodiment 2

[0037] A positive electrode sheet of a battery, such as Figure 6 and 7 As shown, including the pole lug 1 and the pole piece 2, the number of the pole lug 1 is not less than one, and at least one of the not less than one pole lug 1 is located in the middle of the pole piece 2, the pole piece The front of the sheet 2 is connected to the first active layer 21, and the back of the pole sheet 2 is connected to the second active layer 22. The first 21 and the second active layer 22 are composed of positive electrode active materials, and the positive electrode sheet The surface density is 160~220g / m 2. The positive electrode sheet includes a plurality of tabs 1, the number of the tabs 1 is n, where n>1; the pole piece 2 is provided with n main mounting positions 3 and n secondary mounting positions 4 , wherein the i-th tab among the n tabs 1, 1≤i≤n; the i-th tab is installed in one of the i-th main installation position and the i-th sub-installation position, and the pole piece...

Embodiment 3

[0040] A battery core such as Figure 3~5 As shown, it includes the above-mentioned positive electrode sheet 5 , separator 6 and negative electrode sheet 7 , and the core 8 is composed of positive electrode sheet 5 , separator 6 and negative electrode sheet 7 , and the electrode sheet is wound. The thickness of the diaphragm 6 is 12-16 μm, the porosity of the diaphragm 6 is 35-55%, and the air permeability of the diaphragm 6 is 150-300s. The length of the negative electrode sheet of the winding core 8 is greater than the length of the positive electrode sheet. It also includes glue lines, which include a first glue line 91, a second glue line 92, and a third glue line 93, and the first glue line 91 and the second glue line 92 are wound on the core 8, the third closing glue line 93 perpendicularly intersects the first 91 and the second closing glue line 92; the third closing glue line 93 is arranged between the positive pole and the negative pole of the core 8, and the third ...

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Abstract

The invention relates to the field of lithium ion batteries, and provides a battery, and a positive electrode plate and a roll core thereof, which are used for solving the problems of slow charging and quick temperature rise of the battery. The battery comprises tabs and electrode plates; the number of the tabs is not less than 1; at least one of the tabs is located in the middle of the corresponding electrode plate; the front surface of the corresponding electrode plate is connected with a first active layer; the back surface of the corresponding electrode plate is connected with a second active layer; the first active layer and the second active layer are composed of positive electrode active substances; and the surface density of the positive electrode plate is 160-220g / m<2>. The internal resistance of the battery can be reduced; and the rising amplitude of the surface temperature in a charging process of the battery can be reduced.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a battery, a positive electrode sheet and a winding core thereof. Background technique [0002] At this stage, lithium-ion batteries have been widely used in notebook computers, tablet computers, mobile phones, model aircraft, medical equipment, electric tools, automobiles and other industries, but the charging rate is still the main factor restricting its application. [0003] At present, the charging rate of lithium-ion batteries is generally 0.5C, and the charging time is generally more than 2.0 hours; the charging current is relatively small, and the charging time is relatively long. If the charging rate is increased to 3.0C, the charging capacity will be low, and lithium ions will be enriched on the surface of the positive electrode to form a lithium metal precipitation negative electrode. At the same time, when charging with high current, the surface of the battery cel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/26H01M4/13H01M10/0525H01M10/0587H01M50/538
CPCH01M4/13H01M10/0587H01M10/0525H01M50/538Y02E60/10Y02P70/50
Inventor 吴爱深罗新耀邝达辉赵敏杨月坤黄婉榕
Owner 佛山市实达科技有限公司
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