Instrument and method for measuring volume change of battery cell

A technology of volume change and electric core, which is applied in the direction of instruments, measuring devices, and fluid devices, etc., can solve the problems of large battery consumption, high production cost, and high cost, and achieve accurate test results, simple operation, and low cost.

Active Publication Date: 2020-06-09
元能科技(厦门)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (3) Using ordinary balances for weighing, it is impossible to achieve long-term online stable and high-precision measurement;
[0007] (4) The test needs to consume a large number of batteries, the cost is high, and the influence of the inconsistency of the batteries cannot be ruled out
[0009] (1) The operation of the built-in pressure measuring device is cumbersome;
[0010] (2) This method is only applicable to steel shell cells;
[0011] (3) High production cost

Method used

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  • Instrument and method for measuring volume change of battery cell
  • Instrument and method for measuring volume change of battery cell
  • Instrument and method for measuring volume change of battery cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Such as Figure 1~2 As shown, this embodiment provides an instrument for measuring the volume change of the cell, which includes a housing 1, a high-precision mechanical sensing system and a measuring terminal.

[0041] Wherein, the housing 1 can be made of metal material, which forms a relatively closed accommodation space to accommodate the high-precision mechanical sensing system and the measuring end, thereby ensuring that the high-precision mechanical sensing system and the measuring end are in a relatively close position. Stable working environment.

[0042] In this embodiment, the high-precision mechanical sensing system includes a high-precision weight sensor 2 and a sensor bracket 3, and the high-precision weight sensor 2 is fixedly installed in the housing 1; the sensor bracket 3 is installed on the On the high-precision weight sensor 2, its two ends exceed the high-precision weight sensor 2.

[0043] Specifically, in this embodiment, the high-precision weig...

Embodiment 2

[0055] Such as figure 1 As shown, preferably, on the basis of the above embodiments, in this embodiment, the container is a double-layer beaker 8, the outer wall of the double-layer beaker 8 is provided with a water inlet 9 and a water outlet 10, and the double-layer beaker 8 is provided with a water inlet 9 and a water outlet 10, and the double-layer beaker The interlayer 11 of the beaker 8 can pass water to heat the bath liquid and the electric core in a water bath.

[0056] Heated by a water bath, it can meet the temperature conditions of the cell expansion test, which is safe and easy to control the temperature.

Embodiment 3

[0058] Such as image 3 As shown, preferably, on the basis of the above-mentioned embodiments, in this embodiment, an upper inner plate 12 and a lower inner plate 13 are also arranged in the housing 1; the high-precision weight sensor 2 is arranged on the On the upper inner plate 12, the lower inner plate 13 and the bottom plate of the housing 1 constitute the accommodating cavity 14; the first connecting arm 41 and the second connecting arm 42 of the measuring bracket 4 are not in contact with each other. Passes through the upper inner panel 12 and the lower inner panel 13 and extends into the accommodating cavity 14 ; the third connecting arm 43 is located in the accommodating cavity 14 . Non-contact traversal can eliminate the interference of friction force on test results.

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Abstract

The invention discloses an instrument and a method for measuring the volume change of a battery cell, and relates to the field of battery cell measuring. The instrument for measuring the volume changeof the battery cell comprises a shell, a high-precision mechanical sensing system and a measuring end, wherein the measuring end comprises a measuring bracket, a clamp for fixing a to-be-tested battery cell and a container for containing bath foam and the battery cell, the measuring end is connected to the high-precision mechanical sensing system, and a clamp is connected to the measuring bracket. The battery cell is placed on the clamp and immersed in liquid, the buoyancy change of the battery cell is monitored in real time through the high-precision mechanical sensing system, and then the volume change amount of the battery cell is calculated. The instrument can record the volume change of the battery cell in the whole charging and discharging process in situ, so that the accurate gas production volume and gas production rate of the battery cell in each stage can be obtained.

Description

technical field [0001] The invention relates to the field of electric core measurement, in particular to an instrument and method for measuring the volume change of electric cores. Background technique [0002] At present, the methods for measuring the volume change of the cell include a single volume measurement method and an internal pressure measurement method. The single volume measurement method is to use the drainage method to measure the volume of the cell. The internal pressure measurement method is to place a pressure measuring device inside the cell, and use the pressure change to characterize the volume change of the cell. [0003] Disadvantages of the single volumetric method are: [0004] (1) This method can only perform single-point measurement, and cannot obtain the volume change and gas production rate of the entire formation process of the cell; [0005] (2) Ex-situ measurement, this method is easily affected by the external environment during the transfe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B13/00G01B21/00
CPCG01B13/00G01B21/00
Inventor 王益颜旭涛魏奕民黄巍黄振宁张兴华
Owner 元能科技(厦门)有限公司
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