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Lithium battery cavity negative pressure formation method and apparatus

A chemical synthesis method and technology for lithium batteries, which are applied in secondary batteries, electrochemical generators, non-aqueous electrolyte batteries, etc., can solve the problem that the injection hole is difficult to align with the negative pressure hole, so as to reduce the opening time, save costs, The effect of isolating external environmental interference

Pending Publication Date: 2019-03-08
ZHEJIANG HANGKE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a lithium battery cavity negative pressure formation technology, which can realize the overall negative pressure process of the battery cell, and solve the problem that the battery specifications cause the liquid injection hole to be difficult to align with the negative pressure hole

Method used

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  • Lithium battery cavity negative pressure formation method and apparatus
  • Lithium battery cavity negative pressure formation method and apparatus
  • Lithium battery cavity negative pressure formation method and apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Embodiment 1 The lithium battery cavity negative pressure formation method of the present invention comprises the following steps:

[0061] 1) Put the lithium battery that has been injected into the tray, and keep the upper and lower edges of the outer frame of the tray in sealed contact with the upper and lower needle plates; The contact part is equipped with a sealing groove, and when the cylinder is closed, it cooperates with the sealing strip at the needle plate to play a double sealing role; the removable inner village of the tray is made of corrosion-resistant materials, which is convenient for cleaning and battery specification replacement, and plays a certain role in restraint and guiding role;

[0062] 2) Form a sealed environment, airtight test:

[0063] The outer frame of the tray and the upper and lower needle boards are pressed and sealed under the drive of the driving cylinder, so that the entire tray forms a sealed cavity, and the battery contacts the pr...

Embodiment 2

[0076] Embodiment 2 The device constructed according to the lithium battery cavity negative pressure forming method described in Embodiment 1 includes a support device 1, a needle plate assembly 2, a driving cylinder 3, a tray 4 and a control device,

[0077] The support device 1 includes a support plate 11, a support guide rod 12 and a slide block 13, the support plate 11 is provided with holes for the probes to pass through to contact the electrodes of the battery 5, and a plurality of rods and electrodes are installed on the support plate 11. The supporting guide rod 12 that is vertical to the supporting plate and is rotatably connected with it; the supporting guide rod 12 is screwed with a slide block 13, and the sliding block 13 is fixed on the supporting plate 12, and can be moved along the supporting guide rod under the drive of the driving cylinder 3. The rod 12 moves up and down axially to adjust the distance between the needle plate assemblies;

[0078] The needle pl...

Embodiment 3

[0089] Embodiment 3 In terms of negative pressure control, adopt Figure 5 The control unit used. Its negative pressure control process:

[0090] 1) According to the negative pressure process, issue the negative pressure value. When the negative pressure is greater than the set value of 10kps, close the negative pressure valve; when the negative pressure is less than the set value of 10kps, open the negative pressure valve, and the negative pressure will value rises slowly;

[0091] 2) Change the negative pressure value according to the average voltage of the battery; because the type and volume of gas produced by the battery cell are different in different stages of formation; the state of the stage of formation is evaluated by the collected average voltage of the pallet cell, so as to automatically adjust Set value for the corresponding negative pressure;

[0092] 3) Set the negative pressure according to the process time; set the negative pressure value in different time...

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Abstract

The invention discloses a lithium battery cavity negative pressure formation method and an apparatus. The method comprises the following steps: 1) placing a battery core, for which liquid injection iscompleted, into a charging and discharging formation device; 2) turning on a vacuum valve, starting to vacuumize; 3) performing formation charging; 4) after completing formation charging, turning offthe vacuum valve, and breaking a vacuum state through inert gas; 5) taking out the battery from the charging and discharging device, namely, obtaining the needed lithium battery which is subjected tonegative pressure formation. The apparatus comprises a support apparatus, a needle plate component, a driving air cylinder, a tray and a control apparatus. The method and the apparatus provided by the invention have the following beneficial effects: negative pressure requirements of the lithium batteries of various forms can be guaranteed, alignment of battery liquid injection holes is not needed, moreover, a negative pressure pipeline is not directly contacted with the battery, and pollution to the battery caused by electrolyte of the previous batch is avoided. The cavity is sealed through aspecial seal groove design, tightness is better, negative pressure effect can be better, work time of a negative pressure pump is reduced, and an effect of saving energy and reducing emission is realized.

Description

technical field [0001] The invention relates to a lithium battery cavity negative pressure formation method and device. Background technique [0002] Lithium batteries have many advantages such as high energy, small size, light weight, high specific energy, good safety, and flexible design, and are widely used in new energy vehicles and mobile digital products. Among them, some specifications of lithium batteries, such as prismatic lithium batteries, some cylindrical lithium batteries, etc., need to add negative pressure process during the formation process to avoid swelling and dimensional deformation. [0003] Therefore, negative pressure formation is a very important step in the battery production process. During the formation process, the battery will form an SEI film. And this SEI film will affect the internal resistance, capacity, cycle life, self-discharge level, maximum discharge current and other parameters of the finished battery. And the formation of the SEI fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/44
CPCH01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 曹骥曹政桑宏宇马永平
Owner ZHEJIANG HANGKE TECH
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