Detection clamp for testing charge and discharge expansibility of lithium battery

Abstract

The utility model discloses a detection clamp for testing the charging and discharging expansibility of a lithium battery, which comprises a sensor fixing plate, a movable plate, a battery fixing plate and a screw rod, a pressure sensor is arranged between the sensor fixing plate and the movable plate, the pressure sensor is fixedly connected with the sensor fixing plate, a test battery is clamped between the movable plate and the battery fixing plate, and the screw rod is fixedly connected with the test battery. At least six fixing through holes are formed in panels of the sensor fixing plate, the movable plate and the battery fixing plate, screws penetrate through the fixing through holes, and the two ends of each screw are movably connected through locking nuts. Compared with the prior art, the detection fixture has the advantages that the detection fixture is simple in structure and very convenient to assemble, parts are simple to mount and debug, the detection fixture can be assembled through matching of the locking nut and the screw rod, the detection cost is reduced, the heat dissipation performance of detection equipment is good, nature and explosion caused by over-high temperature in the battery detection process are avoided, and the detection efficiency is improved. The measurement data is accurate, and the sensor can be replaced, so that different test requirements can be met.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery detection auxiliary equipment, and in particular relates to a detection fixture for testing the charging and discharging expansion force of a lithium battery. Background Art

[0002] With the development and growth of the lithium battery industry, the requirements for battery safety, energy density, power density, reliability and cycle life are constantly increasing, and the performance of lithium-ion batteries is affected by many factors. During the charging and discharging process of lithium-ion batteries, the embedding and extraction of lithium ions in the electrode active materials will cause the battery to expand and shrink. Under ideal conditions, the volume change of the material during the embedding and extraction process should be reversible. However, in actual situations, there is always a part of lithium ions that cannot be completely extracted from the anode due to changes in battery balance, or deposited on the anode surface as insoluble byproducts during the cycle, causing abnormal expansion of the battery. If the abnormally expanded battery continues to be used, it is easy to catch fire and explode. In order to guide the safe design of battery cells, it is necessary to evaluate the expansion coefficient of different material systems, facilitate the screening of different material systems, and do a good job in factory inspection of batteries. It is necessary to test the expansion force of the battery during charging and discharging to meet the requirements of safe production.

[0003] In the prior art, the device for detecting the expansion degree of lithium batteries during the charging and discharging process is relatively complex in structure and inconvenient to operate. For some small and micro enterprises, the cost of conducting a battery charging and discharging expansion force test is high, which increases the burden on the enterprises. Moreover, the adaptability of the detection device is poor, and it can only be used for testing batteries of a certain specification, and is not suitable for testing batteries of many specifications. Utility Model Content

[0004] The utility model aims to provide a detection fixture for testing the charging and discharging expansion force of a lithium battery, so as to solve the problems in the prior art that the detection device has a complex structure, is inconvenient to operate, has a high detection cost, and has poor adaptability.

[0005] To achieve the above-mentioned purpose, the technical solution of the utility model is: a detection fixture for testing the expansion force of lithium battery charging and discharging, comprising a sensor fixing plate 1, a movable plate 2, a battery fixing plate 3 and a screw 4, a pressure sensor 5 is provided between the sensor fixing plate 1 and the movable plate 2, the pressure sensor 5 is fixedly connected to the sensor fixing plate 1, a test battery 6 is clamped between the movable plate 2 and the battery fixing plate 3, at least 6 fixed through holes 7 are provided on the panels of the sensor fixing plate 1, the movable plate 2 and the battery fixing plate 3, the screw 4 passes through the fixed through hole 7, and its two ends are movably connected by locking nuts 8.

[0006] Preferably, heat dissipation through holes 9 are provided in the middle of the sensor fixing plate 1 , the movable plate 2 and the battery fixing plate 3 .

[0007] Preferably, a temperature sensor 10 is fixedly connected to one side of the battery fixing plate 3 , and the temperature sensor 10 and the pressure sensor 5 are connected to a host computer via a data line 11 .

[0008] Preferably, the diameter of the fixing through hole 7 on the panel of the movable plate 2 is larger than the diameter of the fixing through hole 7 on the panel of the sensor fixing plate 1 and the battery fixing plate 3 .

[0009] Preferably, positioning rods 12 are provided at the bottom of the sensor fixing plate 1 and the battery fixing plate 3 .

[0010] Preferably, a battery limiting through hole 13 is provided between the fixing through holes 7 at the bottom of the sensor fixing plate 1 , the movable plate 2 and the battery fixing plate 3 , and the screw 4 passes through the battery limiting through hole 13 and is movably connected via a locking nut 8 .

[0011] The advantages of the utility model are: the detection fixture has a simple structure, is very convenient to assemble, and is easy to install and debug. It only requires passing the screw through the fixed through hole through three high-strength aluminum alloy plates, and arranging the pressure sensor and the test battery between two adjacent plates respectively. The assembly of the detection fixture can be completed by tightening the nut, and the detection fixture is fixed on the workbench by the positioning rod. The data cable is connected to the host computer to start the expansion force test during the charging and discharging process of the lithium battery, which reduces the detection cost and improves the adaptability of the detection fixture. The equipment can be adjusted according to different battery charging and discharging. The detection equipment has good heat dissipation performance, which avoids natural explosion caused by excessive temperature during battery detection. The force-bearing surface of the pressure sensor is a large circular surface, which is fixed in the center, the measurement data is accurate, and the sensor can be replaced to meet the needs of different tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model.

[0013] Figure 2 It is a side structural schematic diagram of the utility model.

[0014] Figure 3 It is a structural schematic diagram of the sensor fixing plate of the utility model.

[0015] The meanings of the reference numerals are as follows: sensor fixing plate (1), movable plate (2), battery fixing plate (3), screw (4), pressure sensor (5), test battery (6), fixing through hole (7), locking nut (8), heat dissipation through hole (9), temperature sensor (10), data cable (11), positioning rod (12), battery limit through hole (13). DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0017] like Figures 1 to 3 A detection fixture for testing the expansion force of lithium battery charging and discharging shown in the figure includes a sensor fixing plate 1, a movable plate 2, a battery fixing plate 3 and a screw 4. A pressure sensor 5 is provided between the sensor fixing plate 1 and the movable plate 2. The pressure sensor 5 is fixedly connected to the sensor fixing plate 1. A test battery 6 is clamped between the movable plate 2 and the battery fixing plate 3. At least 6 fixing through holes 7 are provided on the panels of the sensor fixing plate 1, the movable plate 2 and the battery fixing plate 3. The screw 4 passes through the fixing through holes 7, and its two ends are movably connected by locking nuts 8. The detection fixture has a simple structure. The screw cooperates with the three fixing plates, a pressure sensor is set between the sensor fixing plate 1 and the movable plate 2, and it is fixed by the locking nut 8, so that the assembly of the detection fixture can be completed, thereby reducing the cost of equipment and detection.

[0018] In order to further improve the heat dissipation effect of the sensor fixing plate 1, the movable plate 2 and the battery fixing plate 3 and avoid fire or even explosion caused by excessive temperature during the detection process, a heat dissipation through hole 9 is provided in the middle of the sensor fixing plate 1, the movable plate 2 and the battery fixing plate 3.

[0019] In order to facilitate the monitoring of the battery temperature during testing, a temperature sensor 10 is fixedly connected to one side of the battery fixing plate 3. The temperature sensor 10 and the pressure sensor 5 are connected to the host computer through a data line 11. The real-time data of the temperature sensor 10 and the pressure sensor 5 are connected to the host computer through the data line 11. The host computer can adjust the detection fixture in time according to the measured temperature and pressure data.

[0020] In order to facilitate the left and right displacement of the movable plate 2 during the test process more conveniently and flexibly, the diameter of the fixed through hole 7 on the panel of the movable plate 2 is set to be larger than the diameter of the fixed through hole 7 on the panel of the sensor fixing plate 1 and the battery fixing plate 3.

[0021] In order to facilitate the fixation of the detection fixture, the detection fixture is fixed on the workbench to ensure its stability during the detection process. A positioning rod 12 is provided at the bottom of the sensor fixing plate 1 and the battery fixing plate 3.

[0022] In order to limit the battery, a battery limiting through hole 13 is provided between the sensor fixing plate 1, the movable plate 2 and the fixed through hole 7 at the bottom of the battery fixing plate 3. The screw 4 passes through the battery limiting through hole 13 and is movably connected by a locking nut 8. The two screws 4 passing through the battery limiting through hole 13 can limit the test battery to prevent it from longitudinal displacement during the detection process.

[0023] The working process of the utility model is as follows: first, the detection fixture is equipped, the sensor fixing plate 1 and the battery fixing plate 3 are inserted into the corresponding jacks of the workbench through the positioning rods 12 at the bottom, and then the movable plate 2 is placed between the sensor fixing plate 1 and the battery fixing plate 3, so that it is close to one side of the pressure sensor 5, and the screw 4 is passed through the fixing through holes 7 and the battery limiting through holes 13 on the sensor fixing plate 1, the movable plate 2 and the battery fixing plate 3, and the two ends of the screw 4 are initially fixed by locking nuts 8; secondly, after the detection fixture is assembled, the test battery 6 to be tested is placed between the movable plate 2 and the battery fixing plate 3, and the battery fixing plate 3 is inserted through the electric The screw 4 of the battery limit hole 13 limits the test battery and prevents the test battery 6 from moving downward. After the test battery 6 is clamped, the locking nut 8 is tightened with a wrench to apply a pre-pressure to the test battery 6; again, the data line 11 of the pressure sensor 5 and the temperature sensor 10 is connected to the host computer; finally, the pressure of the battery is observed by the host computer. If the pre-pressure value does not meet the standard, it is adjusted by tightening the locking nut 8 again. When the preset value is reached, the test battery 6 is powered on for charge and discharge operations. The staff records the expansion force data during the battery charging and discharging process through the host computer for subsequent use.

[0024] At the same time, the side viewing fixture of the utility model can be installed not only vertically but also horizontally to meet the needs of different side viewing environments.

[0025] The above-described embodiments are only preferred examples of the present invention, and the technical solutions of the present invention are not limited thereto. It should be pointed out that for ordinary technicians in this field, under the technical enlightenment provided by the present invention, as common knowledge in the field, other equivalent deformations and improvements can be made, which should also be regarded as the protection scope of the present invention.

Claims

1. A detection fixture for testing the expansion force of a lithium battery during charge and discharge, comprising a sensor fixing plate (1), a movable plate (2), a battery fixing plate (3) and a screw (4), characterized in that: A pressure sensor (5) is provided between the sensor fixing plate (1) and the movable plate (2), and the pressure sensor (5) is fixedly connected to the sensor fixing plate (1). A test battery (6) is clamped between the movable plate (2) and the battery fixing plate (3). At least six fixing through holes (7) are provided on the panels of the sensor fixing plate (1), the movable plate (2) and the battery fixing plate (3), and the screw rod (4) passes through the fixing through hole (7), and its two ends are movably connected via locking nuts (8).

2. A detection fixture for testing the expansion force of a lithium battery during charge and discharge as claimed in claim 1, characterized in that: Heat dissipation through holes (9) are provided in the middle of the sensor fixing plate (1), the movable plate (2) and the battery fixing plate (3).

3. A detection fixture for testing the charge and discharge expansion force of a lithium battery as claimed in claim 2, characterized in that: A temperature sensor (10) is fixedly connected to one side of the battery fixing plate (3); the temperature sensor (10) and the pressure sensor (5) are connected to a host computer via a data line (11).

4. A detection fixture for testing the charge and discharge expansion force of a lithium battery as claimed in claim 3, characterized in that: The diameter of the fixed through hole (7) on the panel of the movable plate (2) is larger than the diameter of the fixed through hole (7) on the panel of the sensor fixing plate (1) and the panel of the battery fixing plate (3).

5. A detection fixture for testing the expansion force of a lithium battery during charge and discharge as claimed in claim 4, characterized in that: Positioning rods (12) are provided at the bottom of the sensor fixing plate (1) and the battery fixing plate (3).

6. A detection fixture for testing the expansion force of a lithium battery during charge and discharge as claimed in claim 5, characterized in that: A battery limiting through hole (13) is provided between the fixing through hole (7) at the bottom of the sensor fixing plate (1), the movable plate (2) and the battery fixing plate (3); the screw rod (4) passes through the battery limiting through hole (13) and is movably connected via a locking nut (8).

Images