Rapid formation method

A chemical formation method and rapid technology, applied in the field of cell manufacturing, can solve the problems of high cell energy density, affecting production efficiency, and poor cell hardness, and achieve the effects of improving infiltration effect, shortening formation time, and improving hardness.

Pending Publication Date: 2021-11-19
NINGBO VEKEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the formation current is 0.1-0.7C, which is fully formed, and the charging time is more than 90min, which affects the production efficiency and the production cycle is long
The polymer cell is a winding structure, and there is a difference in thickness between the lug and the position of the non-tab, the force of the cell is uneven, and the hardness of the cell becomes poor
At present, the energy density of the battery cell is relatively high, so that the wetting effect of the pole piece cannot be guaranteed
[0003] The existing battery cell manufacturing process mainly has the following problems: long formation time, poor cell hardness and poor wetting effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take the battery cell after standing at a high temperature of 50°C for 24 hours, and put it safely into the formation equipment to ensure that the main body of the battery cell is not exposed, and the tabs effectively contact the charging circuit board; the battery cell is transplanted into the formation fixture, and the device is opened to clamp the battery cell , Both sides of the clamping cell have a silicone layer with a hardness of 60° and a thickness of 1.5mm, and the heating temperature of the side plates is 80°C. Clamp the battery cells at different speeds in different pressure ranges, first pressurize to 200kg at a clamping speed of 0.4kg / s, and then pressurize to the required 235kg at a clamping speed of 12kg / s. Send the formation step charging step, the formation current is 0.3C, the constant current charging time is 15min, and the charging voltage is 3.5V. After the clamping pressure reaches the preset value of 590kg, charge it with a formation current of 1....

Embodiment 2

[0034] Compared with Example 1, when the clamping pressure is 236kg, the formation step charging step is sent, the formation current is 0.4C, the constant current charging time is 10min, and the formation voltage reaches 3.6V. When the clamping pressure is 560kg, the formation current is 1.6C, the charging time is 25min, and the formation voltage is 3.9V. When the pressure is 236kg, the formation current is 1.5C, the constant current charging time is 7min, and the formation voltage is 4.3V. The performance test results of the battery cell show that the performance of 800 cycles at room temperature reaches 90.1%, which is 80% higher than the target, and the performance of 500 cycles at 45°C reaches 84.6%, which is 60% higher than the target; the deformation of the battery cell is 0.048mm, The overall hardness is good; the electrolyte retention is 6.19g, and the infiltration effect is good.

Embodiment 3

[0036] Compared with Example 1, when the clamping pressure is 240kg, the formation step charging step is sent, the formation current is 0.5C, the constant current charging time is 12min, and the formation voltage reaches 3.7V. When the clamping pressure is 590kg, the formation current is 1.6C, the charging time is 30min, and the formation voltage is 4.1V. When the pressure is 240kg, the formation current is 1.7C, the constant current charging time is 14min, and the formation voltage is 4.4V. The test results of battery performance show that the performance of 800 cycles at room temperature reaches 90.0%, which is 80% higher than the target, and the performance of 500 cycles at 45°C reaches 84.3%, which is 60% higher than the target; the deformation of the battery is 0.0486mm, The overall hardness is good; the electrolyte retention is 6.16g, and the infiltration effect is good.

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Abstract

The invention discloses a rapid formation method, and belongs to the technical field of battery core manufacturing. The rapid formation method comprises the following steps: S1, pressurizing a battery core by controlling the clamping speed of two side plates of the battery core; S2, applying pressure to a clamping force critical value D1 for first formation charging, applying pressure to a clamping force critical value D2 for second formation charging, and reducing pressure to a clamping force critical value D3 for third formation charging; and S3, finishing charging, and releasing the battery core, wherein silica gel layers are arranged on the inner sides of the two side plates for clamping the battery core. According to the invention, the battery core is wrapped and clamped by the silica gel layer, so that the deformation of the battery core is reduced, and the hardness of the battery core is improved; the formation time is shortened by increasing the charging current in stages; and the infiltrating effect of the pole piece is improved by stepped pressurization.

Description

technical field [0001] The invention belongs to the technical field of electric core manufacturing and relates to a rapid formation method. Background technique [0002] At present, in the manufacturing process of polymer batteries, formation is a key process. The activation of batteries through the formation process directly affects the performance of batteries. At present, the formation current is 0.1-0.7C, which is fully formed, and the charging time is more than 90 minutes, which affects the production efficiency and the production cycle is long. The polymer cell has a winding structure, and there is a difference in thickness between the lug and the non-tab position, the force on the cell is uneven, and the hardness of the cell becomes poor. At present, the energy density of the battery cell is high, so that the wetting effect of the pole piece cannot be guaranteed. [0003] The existing battery cell manufacturing process mainly has the following problems: long formati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/04
CPCH01M10/446H01M10/04Y02P70/50Y02E60/10
Inventor 张衡陶胜孟旭徐志伟张汪汪
Owner NINGBO VEKEN BATTERY
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