Battery cell test fixture

Abstract

The utility model discloses a battery cell test fixture which comprises an upper clamping plate and a lower clamping plate, and four corners of the upper clamping plate and four corners of the lower clamping plate are elastically connected through four springs. The lower clamping plate is provided with a plurality of air channels, and the air channels are connected with a ventilation pipeline or a water cooling pipeline and used for cooling the lower clamping plate. According to the test fixture, through the unique air channel design, a water cooling pipe can be installed in the air channel, the cooling effect is better, two application environments of air cooling and water cooling can be simulated, and good heat dissipation is guaranteed in the battery cell test process. In order to ensure that the battery cell has good temperature stability, release the expansion pressure of the battery cell and detect the change of the expansion force of the battery cell at the same time.

Description

Technical Field

[0001] The utility model relates to a battery testing device, in particular to a cell testing fixture. Background Art

[0002] After being made into a battery module, the cells generally adopt two common structures: liquid cooling and air cooling. During the cell testing process, it is necessary to simulate the two structures of air cooling and liquid cooling for testing. The existing testing fixtures generally can only simulate one application environment and cannot be switched arbitrarily. If it is necessary to switch the application environment, the fixture and supporting equipment need to be replaced. In addition, during the cell testing process, the cells will generate heat, and the battery is very sensitive to temperature. The cell fixtures are mostly made of aluminum alloy and steel. To ensure good temperature stability of the cells, it is necessary to dissipate heat from the fixture. And during the cell testing process, the cells will expand due to heat. The end plate structure of the existing fixture module fixedly clamps the cells, and too large expansion pressure of the cells will cause the cells to decay. Therefore, it is necessary to monitor the change of the expansion force of the cells at all times and be able to release the expansion pressure of the cells. Content of the Utility Model

[0003] In order to solve the above technical problems, the utility model provides a testing fixture that can simulate two application environments of air cooling and liquid cooling, and can release the expansion pressure of the cells and detect the change of the expansion force of the cells. The specific technical solutions are as follows:

[0004] A cell testing fixture includes: an upper clamping plate and a lower clamping plate, and the four corners of the upper clamping plate and the lower clamping plate are elastically connected by four springs; the lower clamping plate is provided with a plurality of air ducts, and the air ducts are connected to a ventilation pipeline or a water cooling pipeline for cooling the lower clamping plate. The four springs can ensure that the cells expand and contract cyclically under a constant force.

[0005] Preferably, a groove is provided on the inner side of the upper clamping plate; a pressure film sensor is installed in the groove, and after the pressure film sensor is installed, the inner side of the upper clamping plate is flush; the pressure film sensor is used to sense the change of the expansion pressure of the cells, and the detected data can be used as a reference for the design of the module.

[0006] The testing fixture of the utility model, through a unique air duct design, a water cooling pipe can also be installed in the air duct, and the cooling effect is better. It can simulate two application environments of air cooling and liquid cooling and ensure good heat dissipation during the cell testing process. To ensure good temperature stability of the cells, and can release the expansion pressure of the cells, and at the same time detect the change of the expansion force of the cells. Description of the Drawings

[0007] The drawings described herein are used to provide a further understanding of the utility model, and constitute a part of the utility model. The schematic embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an improper limitation to the utility model.

[0008] Figure 1 Schematic three-dimensional structure diagram of the cell testing fixture of the present utility model;

[0009] Figure 2 Top view structure diagram of the upper clamping plate of the cell testing fixture of the present utility model;

[0010] Figure 3 is Figure 1 Side structure diagram along the length direction in

[0011] Figure 4 is Figure 1 Side structure diagram along the width direction in Specific embodiments

[0012] For a clearer interpretation of the overall concept of this application, the following will be described in detail by way of examples in conjunction with the accompanying drawings of the specification.

[0013] As Figures 1 to 4 shown is the structure diagram of the cell testing fixture of the present utility model. A cell testing fixture 100 includes an upper clamping plate 110 and a lower clamping plate 120. The upper clamping plate 110 and the lower clamping plate 120 are generally rectangular and are generally made of aluminum or steel. The four corners of the upper clamping plate 110 and the lower clamping plate 120 are elastically connected by four springs 130, and the middle is used to prevent the cell from being tested. The springs 130 can ensure that the cell expands and contracts cyclically under a constant clamping force, and the distance between the upper clamping plate 110 and the lower clamping plate 120 also changes with the expansion and contraction of the cell, releasing the pressure of the cell expansion. Four adjusting bolts can also be inserted into the four springs 130, and when needed, the distance and clamping force between the upper clamping plate 110 and the lower clamping plate 120 can be adjusted and controlled.

[0014] The lower clamping plate 120 is provided with a plurality of air ducts 140, and the air ducts 140 are connected to ventilation pipelines or water cooling pipelines for cooling the lower clamping plate 120. By switching different cooling modes, different cooling application environments can be simulated. And there is no need to replace the fixture type, and good temperature stability of the cell can be ensured.

[0015] When the cell expands, the contact surface of the fixture that clamps it must be flat. An uneven inner side will cause the cell to be damaged. A groove 150 is provided on the inner side of the upper clamping plate 110; a pressure film sensor 160 is installed in the groove 150, and after the pressure film sensor 160 is installed, the inner side of the upper clamping plate is just flush. The pressure film sensor 160 is used to sense the pressure change of the cell expansion, and the detected data can be used as a reference for the module design.

[0016] The above examples are only embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the scope of the claims of the present utility model.

Claims

1. A cell test fixture (100), characterized in that, Comprising: an upper clamping plate (110) and a lower clamping plate (120); the four corners of the upper clamping plate (110) and the lower clamping plate (120) are elastically connected by four springs (130); the lower clamping plate (120) is provided with a plurality of air ducts (140), and the air ducts (140) are connected to a ventilation pipeline or a water cooling pipeline for cooling the lower clamping plate (120).

2. The cell testing fixture (100) according to claim 1, wherein: a groove (150) is provided on the inner side of the upper clamping plate (110); a pressure film sensor (160) is installed in the groove (150), and after the pressure film sensor (160) is installed, the inner side surface of the upper clamping plate (110) is flush; the pressure film sensor (160) is used for sensing the pressure change of the cell expansion.

Images