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CN-224216847-U - Testing device

CN224216847UCN 224216847 UCN224216847 UCN 224216847UCN-224216847-U

Abstract

The application relates to a testing device which comprises a base, a movable plate and a force application part, wherein the base comprises a bottom plate, the movable plate is parallel to the bottom plate and is arranged at intervals, a battery cell installation space is formed between the movable plate and the bottom plate, the movable plate can move relative to the bottom plate to be close to or far away from the bottom plate, the force application part is connected between the base and the movable plate, and the force application part acts on the movable plate with constant preset force to enable the movable plate to move to one side of the bottom plate. The testing device can be used for carrying out constant-voltage cyclic testing on the battery cell, and can simplify the whole structure, reduce the cost and facilitate the operation.

Inventors

  • ZHANG YANBING
  • LI WEI
  • LIU ZHIMIN

Assignees

  • 北京车和家汽车科技有限公司

Dates

Publication Date
20260508
Application Date
20250416

Claims (11)

  1. 1. The testing device is characterized by comprising a base (1), a movable plate (2) and a force application component (4); the base (1) comprises a bottom plate (11), and the movable plate (2) is parallel to the bottom plate (11) and is arranged at intervals, and a battery cell installation space is formed between the movable plate and the bottom plate (11); The movable plate (2) is movable relative to the base plate (11) to be close to or away from the base plate (11); The force application component (4) is connected between the base (1) and the movable plate (2), and the force application component (4) acts on the movable plate (2) with a constant preset force so as to enable the movable plate (2) to move to one side of the bottom plate (11).
  2. 2. The test device according to claim 1, wherein the force application member (4) is detachably connected to the base (1) and the movable plate (2), respectively.
  3. 3. The test device according to claim 1 or 2, further comprising a displacement detection portion (5), the displacement detection portion (5) being provided to the base (1) and configured to detect a displacement of the movable plate (2) with respect to the base plate (11).
  4. 4. A testing device according to claim 3, wherein the base (1) further comprises a supporting portion (12), the supporting portion (12) is located at a side of the movable plate (2) away from the bottom plate (11), the supporting portion (12) is fixed with the bottom plate (11), the displacement detecting portion (5) is fixedly arranged at the supporting portion (12), and the probe (51) of the displacement detecting portion (5) is abutted to a side of the movable plate (2) away from the bottom plate (11).
  5. 5. The test device according to claim 4, characterized in that the base (1) is further provided with a guide bar (3), the guide bar (3) passing through the movable plate (2), the movable plate (2) being movable relative to the base plate (11) in the axial direction of the guide bar (3).
  6. 6. Testing device according to claim 5, characterized in that the base plate (11) and the support (12) are fixed by means of the guide bar (3).
  7. 7. The test device according to claim 6, characterized in that the base plate (11) and the support (12) are fixed by a plurality of screws (13) arranged in the circumferential direction, the screws (13) forming the guide bar (3).
  8. 8. The test device according to any one of claims 4-7, wherein the force application member (4) comprises a resilient member (43), the resilient member (43) comprising a spring (431) and a slider (432) connected to one end of the spring (431), the axis of the spring (431) being arranged at an angle to the direction of movement of the movable plate (2); One end of the spring (431) away from the sliding block (432) is connected with the supporting part (12), a slideway is arranged on the side wall of the movable plate (2), the sliding block (432) can slide along the slideway, or one end of the spring (431) away from the sliding block (432) is connected with the movable plate (2), a slideway is arranged on the side wall of the supporting part (12), and the sliding block (432) can slide along the slideway; The sliding way and the moving direction of the movable plate (2) are arranged at an included angle.
  9. 9. The test device according to any one of claims 4 to 7, wherein the force application member (4) includes a connection block (44), a length of the connection block (44) has a stable restoring force within a preset deformation amount range, one end of the connection block (44) in a length direction is connected to the movable plate (2), and the other end of the connection block (44) in the length direction is connected to the support portion (12).
  10. 10. The test device according to any one of claims 1-7, wherein the force applying member (4) comprises a constant force spring (41), one end of the constant force spring (41) being connected to the base (1), the other end of the constant force spring (41) being connected to the movable plate (2).
  11. 11. The test device according to any one of claims 1-7, wherein the force applying member (4) comprises a pressure regulating valve and a driving cylinder (42), the driving cylinder (42) comprising a cylinder body (421) and a piston rod (422), one of the cylinder body (421) and the piston rod (422) being connected to the base (1) and the other being connected to the piston rod (422), the pressure regulating valve being adapted to regulate the pressure in the cylinder body (421) to a constant preset pressure.

Description

Testing device Technical Field The application relates to the technical field of test equipment, in particular to a test device. Background The constant pressure circulation mode is a main mode of the current battery cell charge-discharge circulation test, the thickness of the battery cell can be continuously accumulated along with the progress of charge-discharge circulation, the current research shows that the battery cell circulation is in a comfortable pressure range, when the expansion force is increased to exceed the comfortable pressure range, the circulation performance of the battery cell can be influenced, under the constant pressure circulation mode, the battery cell can be ensured to bear constant pressure in the whole life cycle, and when the constant pressure is arranged in the comfortable pressure range of the battery cell, the exertion of the circulation performance is facilitated. The scheme for realizing constant pressure circulation currently comprises the steps of realizing the constant pressure circulation by constant pressure circulation test equipment or applying gravity. The constant-pressure circulation test equipment consists of a force application system, a monitoring system and a feedback system, and the main principle is that the constant force is applied to the battery core through the force application system of equipment consisting of a servo motor or a hydraulic system, the monitoring system monitors the circulation expansion force of the battery core in real time, when the expansion force exceeds a set value, the feedback system feeds back a signal to the force application system to adjust the force applied to the battery core so as to ensure that the force is in a comfortable pressure range, the equipment structure is complex and the cost is high, and the battery core circulation generally needs to be circulated in the equipment, so that the selection of the circulation environment of the battery core, such as normal temperature circulation, high temperature circulation, water cooling circulation and the like, is limited. The constant pressure circulation is realized by applying a weight on the surface of the cell by using the principle of gravity constancy, but the constant comfortable pressure circulation is realized by applying the weight, the required weight is at least tens of kilograms, the weight and the volume of the weight are large, and the operation is inconvenient. In addition, the gravity direction is vertical downward, and the circulating expansion force direction of the battery cell is generally horizontal, so that the battery cell cannot be directly applied, and the conversion of the gravity direction is realized by means of a specific tool. Therefore, how to perform constant voltage power cycle test on the battery cell, which simplifies the whole structure, reduces the cost and is convenient to operate, is a technical problem that needs to be solved by those skilled in the art. Disclosure of utility model The application aims to provide a testing device which can be used for carrying out constant voltage power cycle testing on an electric core, and can simplify the whole structure, reduce the cost and facilitate the operation. In order to solve the technical problems, the application provides a testing device which comprises a base, a movable plate and a force application part, wherein the base comprises a bottom plate, the movable plate is parallel to the bottom plate and is arranged at intervals, a battery cell installation space is formed between the movable plate and the bottom plate, the movable plate can move relative to the bottom plate to be close to or far away from the bottom plate, the force application part is connected between the base and the movable plate, and the force application part acts on the movable plate with constant preset force to enable the movable plate to move towards one side of the bottom plate. In the process of carrying out constant-pressure charge-discharge cyclic test on the battery cell through the test device, the force application component applies constant preset force to the movable plate, so that the movable plate moves to one side of the bottom plate and clamps the battery cell, the comfortable pressure range of the battery cell is uncertain, therefore, the preset force adopted by each group of tests can be different through multiple groups of tests, and (3) carrying out charge and discharge cycle test on the battery cell until the capacity retention rate of the battery cell reaches a preset threshold value, or stopping the test after carrying out charge and discharge cycle test for preset times, wherein each group of test can obtain a cycle number and capacity retention rate curve, and the comfortable pressure range of the battery cell can be determined according to the curves of each group of test. The testing device can realize the cyclic test of the battery cell under constant pressure, and the optimal comforta