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Winding battery cell, preparation method thereof and winding battery

A cell, white area technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of limiting the energy density of winding batteries, waste of anode sheet materials, etc., to increase battery energy density, reduce area, The effect of high load

Pending Publication Date: 2022-03-04
佛山(华南)新材料研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the arrangement of the tabs and the winding method of the traditional wound battery, a large area of ​​uncoated plasma material remains on the anode sheet, which wastes the material of the anode sheet of the wound battery and limits the energy density of the wound battery

Method used

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  • Winding battery cell, preparation method thereof and winding battery
  • Winding battery cell, preparation method thereof and winding battery
  • Winding battery cell, preparation method thereof and winding battery

Examples

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preparation example Construction

[0044] see figure 1 , the invention provides a method for preparing a wound electric core, comprising:

[0045] S1: Provide aluminum foil 11, coat the positive electrode slurry on the front and back, and connect the first tab 13 to obtain the cathode sheet 1;

[0046] see image 3 , Figure 4 The front of the cathode sheet is provided with a first positive electrode slurry coating area 12 and a first blank area 14, and the back of the cathode sheet 1 is provided with a second positive electrode slurry coating area 16 and a second blank area 15. The first blank area 14 and the second blank area 15 are arranged at the winding end of the cathode sheet 1 .

[0047] Wherein, the width of the first blank area 14 and the second blank area 15 is the same as that of the aluminum foil 11, which is 60-70 mm. The lengths of the first blank area 14 and the second blank area 15 are the same, being 25-35 mm, exemplarily 26 mm, 29 mm, 32 mm, 35 mm, but not limited thereto. The first blan...

Embodiment 1

[0076] This embodiment provides a winding cell:

[0077] (1) provide the aluminum foil that width is 67mm, this aluminum foil is coated positive electrode slurry on its front and back side, and connects first tab, obtains cathode sheet,

[0078] Among them, the positive electrode slurry is made by mixing 90wt% LiNi0.5Co0.2Mn0.3O2, 5wt% Super P, and 5wt% pvdf, adding NMP solvent (60% of the mass of the first three substances) and stirring for 4 hours.

[0079] Wherein, the front side of the cathode sheet is provided with a first positive electrode slurry coating area and a first blank area, and the back side of the cathode sheet is provided with a second positive electrode slurry coating area and a second blank area. The first blank area and the second blank area are arranged at the winding end of the cathode sheet. The length of the first positive electrode slurry coating area and the second positive electrode slurry coating area is 1200mm; the length of the first blank area ...

Embodiment 2

[0090] This embodiment provides a winding cell:

[0091] The difference between embodiment 2 and embodiment 1 is;

[0092] The first positive electrode slurry coating area of ​​the cathode sheet is provided with a through hole with an aperture of 0.7 mm and a distance of 2 mm between adjacent through holes; the first negative electrode slurry coating area of ​​the anode sheet is provided with an aperture of 0.7 mm, and the distance between adjacent through holes is 2mm.

[0093] The wound battery made of the wound battery cell of Example 2 has an energy density of 289.97wh / kg through an electrolytic transformer regulator.

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Abstract

The invention discloses a preparation method of a wound battery, which comprises the following steps: (1) providing an aluminum foil, coating positive electrode slurry on the front surface and the back surface of the aluminum foil, connecting a first tab to obtain a cathode plate, and arranging the first tab between the winding starting end and the winding tail end of the cathode plate; (2) a copper foil is provided, the front face and the back face of the copper foil are coated with negative electrode slurry, a second tab is bonded, an anode strip is obtained, and the second tab is arranged between the winding starting end and the winding tail end of the anode strip; (3) providing a diaphragm sheet; and (4) sequentially laminating and winding the anode piece, the diaphragm piece and the cathode piece to form a wound battery cell. The invention also provides a winding battery cell prepared by the method, and the invention also provides a winding battery prepared by the technical scheme. According to the invention, by changing the position of the tab and the coiling mode of the coiled battery, the area of a blank area of the anode plate can be reduced, the load capacity of the cathode slurry is increased, and the battery capacity is further increased.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a winding battery core, a preparation method thereof, and a winding battery. Background technique [0002] A battery composed of batteries formed in a winding manner is called a wound battery. The winding battery has a super high-rate discharge capability, the maximum discharge rate is 18C10; excellent high and low temperature performance, can work at -55°C-75°C; stable high output voltage, higher energy density; strong structure, It has excellent shock resistance; no free electrolyte, it can be placed in any direction; it can be charged quickly, and more than 95% of the electricity can be charged within 40 minutes; it has a long life, and the designed float life can reach more than 8 years; extremely high The ability to withstand small current deep discharge. The advantages of winding batteries make them suitable for the field of new energy vehicles, but with the rap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0587H01M50/533
CPCH01M10/0587H01M50/533Y02E60/10Y02P70/50
Inventor 刘亭叶宇昊徐亚辉
Owner 佛山(华南)新材料研究院
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