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Tool for determining pre-tightening force of soft package battery, method for determining pre-tightening force of soft package battery and method for assembling soft package module

A soft-pack battery and preload technology, which is applied in battery assembly machines, secondary battery manufacturing, and electrical measurement, can solve the problems of not paying attention to the battery assembly process and introducing battery predictive force testing methods, etc.

Active Publication Date: 2020-08-14
SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] As can be seen from the above, in the process of testing cell pressure and size change, only the internal pressure change caused by cell expansion is concerned, that is, the battery expansion is caused by the battery during use. pressure changes, but did not pay attention to the battery assembly process
At present, there are very few studies on the test and determination methods of the preload force of pouch batteries, and no published literature or patents have introduced a scientific battery predictive force test method

Method used

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  • Tool for determining pre-tightening force of soft package battery, method for determining pre-tightening force of soft package battery and method for assembling soft package module

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] This embodiment provides a tool for determining the preload of a pouch battery. The tool includes an upper splint 5, a lower splint 7, a cylinder fixing plate 3, a cylinder 2, a pressure gauge 1, a support bolt 4, and a displacement sensor 8; The pouch battery is sandwiched between the upper splint 5 and the lower splint 7, and the lower splint 7 is connected to the support bolt 4; there are four holes on the upper splint 5 corresponding to the lower splint 7 and the support bolt 4; the cylinder fixing plate 3 passes through the support bolt 4 fixed; the cylinder 2 is fixed on the cylinder fixing plate 3 through the support bolt 4, the cylinder 2 includes a piston rod, the piston rod is in contact with the upper splint 5 and clamps the battery through the upper splint 5 when the cylinder 2 is ventilated; the pressure gauge 1 is connected with the cylinder, It is used to monitor the pressure between the pouch battery and the upper splint during the test and feed it back t...

Embodiment 2

[0055] This embodiment provides a method for determining the preload of a pouch battery using the tooling of Embodiment 1, the method comprising the following steps:

[0056] (1) Place the pouch battery between the upper splint 5 and the lower splint 7;

[0057] (2) Apply an initial pressure F to the upper splint 5 through the cylinder 2 0 The pouch battery is clamped, and the charge-discharge cycle test is performed on the pouch battery in the clamped state. During the charge-discharge cycle test, the pressure between the pouch battery and the upper splint 5 is monitored by the monitoring device, and the charge-discharge cycle is recorded. The actual pressure between the pouch battery and the upper splint 5 in the test is F 1 ; If the pressure F between the pouch battery and the upper splint 5 1 with F 0 different, the pressure information will be fed back to the pressure control device, and the pressure control device will adjust the cylinder 2 to restore the pressure bet...

Embodiment 3

[0062] This embodiment provides a method for assembling a pouch battery module, the method comprising the following steps:

[0063] (1) Stack the left side plate and the right side plate on the side of the cell pack respectively, and apply a pre-tightening force in the width direction of the module for clamping. The pre-tightening force is the pre-tightening force determined by the method described in Example 2 force;

[0064] (2) Under the condition of maintaining clamping, detachably connect the upper cover plate and the lower cover plate to the left side plate and the right side plate respectively, or connect the front side plate and the rear side plate to the left side plate respectively It is detachably connected with the right side plate, so that the upper and lower cover plates or the front and rear side plates exert continuous pressure on the left and right side plates;

[0065] (3) Release the clamping and continue to connect so that the left side plate, right side p...

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Abstract

The invention discloses a tool for determining the pre-tightening force of a soft package battery, a method for determining the pre-tightening force of a soft package battery and a method for assembling a soft package module. The tool comprises an upper clamping plate and a lower clamping plate which are used for clamping a soft package battery, an air cylinder being arranged on an air cylinder fixing plate and used for applying a pressure to the upper clamping plate so as to clamp the soft package battery, a pressure monitoring device being connected with the air cylinder and used for monitoring the pressure between the soft package battery and the upper clamping plate, and a control device being connected with the pressure monitoring device and the air cylinder and used for adjusting thepressure applied to the upper clamping plate by the air cylinder according to pressure information fed back by the monitoring device. According to the tool, the pressure is applied to the upper clamping plate through the air cylinder, the air cylinder can be adjusted according to the pressure information, fed back by the pressure monitoring device, between the soft package battery and the upper clamping plate, so that the pressure between the soft package battery and the upper clamping plate is kept unchanged, and thus a problem that the pre-tightening force of the soft package battery cannotbe determined in the prior art is solved.

Description

technical field [0001] The invention relates to the technical field of batteries, and relates to a tool for determining the pretension force of a pouch battery, a method for determining the pretension force of the pouch battery and module assembly. Background technique [0002] The volume expansion of pouch batteries will lead to performance changes during use or work. For example, the battery expands in the middle and late stages of life, resulting in increased thickness, increased internal resistance of the battery cell, and capacity attenuation. [0003] Existing studies have shown that when the pouch battery is applied with a certain preload, the expansion of the battery will be slowed down during the service life, so that the performance of the battery during the service life will be improved (slow internal resistance growth, slow capacity decay). However, the research on the pretightening force in the prior art is still in its infancy, and how to accurately and efficie...

Claims

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Application Information

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IPC IPC(8): G01L5/00G01R31/385H01M10/04
CPCG01L5/0028G01R31/385H01M10/0404Y02P70/50Y02E60/10
Inventor 李峥冯玉川何泓材陈凯杨帆
Owner SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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