Lithium battery performance testing device and testing method thereof

Abstract

The invention discloses a lithium battery performance testing device which comprises a testing box, a testing frame is arranged in the testing box, a plurality of testing units are arranged on the testing frame, each testing unit is of a hollow cube structure with two open ends and arranged in the testing frame in a rectangular mode, and a heat insulation layer is arranged in a unit partition wall of every two adjacent testing units. Each test unit is provided with a temperature control assembly and a charge and discharge test system which are independently controlled; the temperature control assembly comprises heating units and refrigerating units, the heating units are arranged on the left and right side walls of the placement unit, and the refrigerating units are arranged on the front and rear inner walls, corresponding to the placement unit, of the test box. According to the invention, multiple groups of samples can be tested at the same time through the multiple placement units arranged on the test frame, and each placement unit is internally provided with the independently controlled temperature control assembly and the charge-discharge test system, so that the performance parameters of the lithium battery under different temperature gradients can be obtained in the same test process, the test flow is optimized, and the test efficiency is improved. And the test efficiency is improved.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of battery testing, and specifically to a lithium battery performance testing device and a testing method thereof. Background Art

[0002] As a highly efficient energy carrier, lithium batteries are widely used in a variety of electronic devices, such as imaging devices, communication equipment, optical instruments, medical instruments, computers, mobile phones, etc. Before lithium batteries are put into use, they need to be performance tested to simulate various situations during battery use in order to verify the electrical properties and service life of lithium batteries.

[0003] The existing technology discloses a battery performance test device and method, which includes a box, a controller, a temperature adjustment unit, a battery tester and a liquid storage tank, wherein the liquid storage tank stores non-conductive coolant, the box has a liquid inlet and a liquid outlet, the outlet of the liquid storage tank is connected to the liquid inlet, and the liquid outlet is connected to the inlet of the liquid storage tank, at least one clamp for fixing the battery to be tested is installed in the box, and the battery tester is installed on the outside of the box for electrical connection with the battery to be tested; the controller and the temperature adjustment unit are electrically connected to adjust the temperature of the coolant. This test method can accurately simulate the normal temperature or cooling and cooling of the battery during actual use, effectively restore the thermal management conditions of the battery during use, ensure the authenticity and accuracy of the battery performance test, and improve the accuracy of the battery performance test parameters.

[0004] However, the above technology requires multiple test cycles to obtain the performance data of the battery at different temperatures. Each cycle also includes multiple charge and discharge operations and corresponding capacity calibration, internal resistance testing and other steps. The overall test process is time-consuming. In actual use, the battery may also be squeezed by external forces, and the battery performance test is also required in this case. Summary of the invention

[0005] The present invention mainly provides a lithium battery performance testing device and a testing method thereof, which are used to solve the technical problems raised in the above background technology.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: A lithium battery performance testing device comprises a test box, wherein a test frame is provided in the test box, and a plurality of placement units are provided on the test frame; The placement units are hollow cube structures with openings at both ends, which are arranged in a rectangular shape in the test rack, and a heat insulation layer is provided in the cell partition wall between adjacent placement units. In addition, each placement unit is provided with an independently controlled temperature control component and a charge and discharge test system; The temperature control component includes a heating unit and a refrigeration unit, and the heating unit is arranged on the left and right side walls of the placement unit; The refrigeration unit is arranged on the front and rear inner walls corresponding to the test box and the placement unit.

[0007] Furthermore, the heating unit is a heating plate composited with an electrical insulating material and a heating material, and its coverage area is designed according to the size of the placement unit to ensure that sufficient heat can be provided to the placement unit so that the temperature in the entire placement unit can reach the high temperature environment of 30°C-60°C required by the test.

[0008] Furthermore, the refrigeration unit is a semiconductor refrigeration chip, which is connected to the temperature control circuit to achieve precise control of the temperature in the placement unit and quickly adjust the cooling capacity so that the temperature in the entire placement unit can reach the -20℃-0℃ low temperature environment required by the test.

[0009] Furthermore, a temperature sensor is provided in the placement unit, and the temperature sensor is electrically connected to a control system. The control system is also electrically connected to a temperature control component. The heating unit and the refrigeration unit in the temperature control component work together under the control of the control system.

[0010] Furthermore, the test box is a hollow cube with one end open, and its shell is made of stainless steel. The inside of the test box shell is filled with an insulation layer, and the insulation layer is made of polyurethane foam. In addition, a heat sink is provided at the position where the refrigeration unit is installed in the test box.

[0011] Furthermore, the test stand is provided with a pressurizing unit, which includes an electric hydraulic jack. The output end of the electric hydraulic jack is connected to a pressure plate. A rubber pad is provided on the contact surface between the pressure plate and the battery. A pressure sensor is also provided on the pressure plate. The pressure sensor is electrically connected to the control system.

[0012] Furthermore, the test box is provided with a transfer mechanism, which includes a pair of parallel positioning cylinders, the positioning cylinders are installed on the top of the side walls of the test box, and a rotating cylinder is rotatably connected inside the positioning cylinder, one end of the rotating cylinder passes through the side wall of the test box and is transmission-connected to a driving mechanism, and the other end is rotatably connected to a threaded rod, and the end of the threaded rod away from the rotating cylinder is rotatably connected to the test frame through a bearing seat.

[0013] Furthermore, the driving mechanism includes a shell, a driving motor is arranged in the shell, an output end of the driving motor is connected to a driving gear, the driving gear is connected to two driven gears through a chain transmission, and the driven gears are respectively connected to the rotating cylinder.

[0014] Furthermore, a sealing door is provided on the side of the test stand away from the test box, the size of the sealing door matches the inner cavity size of the test box, and a sealing insulation strip is provided on the sealing door. In addition, two parallel dovetail grooves are provided at the bottom of the test box, and a dovetail slider corresponding to the dovetail groove is provided at the bottom of the test stand.

[0015] A lithium battery performance testing method, using a lithium battery testing device in the above technical solution for testing, comprises the following steps: SP1. Place the battery. Place the lithium battery sample in the placement unit on the test rack and electrically connect it to the charge and discharge test system. Then move the test rack into the test box through the transfer mechanism. SP2, battery testing, the control system controls the temperature control component and the pressurizing unit to work, and the charge and discharge test system detects the lithium battery samples to obtain the performance parameters of the lithium battery samples under different temperature and pressure environments; SP3. Take out the battery, shut down the temperature control component, pressurizing unit and charge and discharge test system through the control system, and after the environment in the test box returns to normal, move the test rack out of the test box through the transfer mechanism and take out the lithium battery sample; SP4: Data analysis: Analyze and compare the performance parameters of the lithium battery samples obtained in SP2 with the performance parameters under normal conditions to obtain test conclusions.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention can test multiple groups of samples at the same time by setting up multiple placement units on the test rack, and each placement unit is equipped with an independently controlled temperature control component and a charge and discharge test system, which can obtain the performance parameters of the lithium battery under different temperature gradients in the same test process, optimize the test process, and improve the test efficiency.

[0017] 2. The heating unit provided in the present invention is located on the left and right side walls of the placement unit, and the refrigeration unit is located on the front and rear walls of the test box. This layout, combined with the insulation layer of the partition wall of the adjacent placement unit, can create a complex and diverse temperature field environment in the test box. Not only can a single high-temperature or low-temperature environment simulation be achieved, but also a temperature gradient scenario can be constructed, such as simulating the temperature difference at different positions in the battery pack, which is helpful for in-depth research on the performance characteristics of lithium batteries under non-uniform temperature distribution, making the test results more in line with the actual application scenario, and providing strong support for optimizing the battery pack thermal management system.

[0018] 3. The present invention drives the pressure plate by means of an electric hydraulic jack, and is equipped with a rubber pad and a pressure sensor, and can flexibly adjust the pressure through a control system to simulate different pressure environments. This allows the pressure factors faced by lithium batteries in actual use to be fully considered when testing their performance, thereby evaluating the impact of pressure on lithium battery performance parameters and providing a basis for improving the reliability of lithium batteries in different mechanical stress environments.

[0019] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the back side of the overall structure of the present invention; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 It is a front cross-sectional view of the test stand of the present invention; Figure 5 is a side cross-sectional view of the test stand of the present invention; Figure 6 is a side cross-sectional view of the test box of the present invention; Figure 7 It is a side cross-sectional view of the driving structure of the present invention; Figure 8 It is a step diagram of the testing method of the present invention.

[0021] Description of the drawings: 1. Test box; 101. Insulation layer; 102. Heat sink; 103. Dovetail groove; 2. Test frame; 201. Sealed door; 202. Sealed insulation strip; 203. Dovetail slider; 3. Placement unit; 301. Insulation board; 302. Temperature sensor; 4. Temperature control assembly; 401. Heating unit; 402. Refrigeration unit; 5. Charge and discharge test system; 6. Pressurization unit; 601. Electric hydraulic jack; 602. Pressure plate; 603. Rubber pad; 604. Pressure sensor; 7. Transfer mechanism; 701. Positioning cylinder; 702. Rotating cylinder; 703. Threaded rod; 704. Bearing seat; 8. Driving mechanism; 801. Housing; 802. Driving motor; 803. Driving gear; 804. Chain; 805. Driven gear; 9. Control system. DETAILED DESCRIPTION

[0022] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive. Example

[0023] Please refer to the attached Figure 1 , 2 As shown in , 4 and 5, a lithium battery performance test device comprises a test box 1, a test rack 2 is arranged in the test box 1, and a plurality of placement units 3 are arranged on the test rack 2. The placement units 3 are hollow cube structures with openings at both ends, which are arranged in a rectangular shape in the test rack 2, and a heat insulation board 301 is arranged in the cell partition wall of adjacent placement units 3. In addition, each placement unit 3 is provided with an independently controlled temperature control component 4 and a charge and discharge test system 5. The temperature control component 4 comprises a heating unit 401 and a refrigeration unit 402. The heating unit 401 is arranged on the left and right side walls of the placement unit 3, and the refrigeration unit 402 is arranged on the front and rear inner walls corresponding to the test box 1 and the placement unit 3. A temperature sensor 302 is arranged in the placement unit 3, and the temperature sensor 302 is electrically connected to a control system 9, which is also electrically connected to the temperature control component 4. The heating unit 401 and the refrigeration unit 402 in the temperature control component 4 work together under the action of the control system 9.

[0024] It should be noted that the heating unit 401 and the cooling unit 402 work together in the placement unit, which can not only realize a single high temperature or low temperature environment simulation, but also construct a temperature gradient scene to simulate the performance test of lithium batteries under actual complex temperature fields (such as uneven temperature distribution in the battery pack).

[0025] It should be noted that the heating unit 401 is a heating plate composited with an electrical insulating material and a heating material, and its coverage area is designed according to the size of the placement unit 3 to ensure that sufficient heat can be provided to the placement unit 3, so that the temperature in the entire placement unit 3 can reach the 30°C-60°C high temperature environment required by the test; the refrigeration unit 402 is a semiconductor refrigeration plate, which is connected to the temperature control circuit to achieve precise control of the temperature in the placement unit 3 and quickly adjust the cooling capacity to simulate the performance test of the lithium battery in different low temperature environments and temperature dynamic change scenarios, so that the temperature in the entire placement unit 3 can reach the -20°C-0°C low temperature environment required by the test.

[0026] It should be noted that the test box 1 is a hollow cube with an open end, and its shell is made of stainless steel. Stainless steel has good corrosion resistance and high strength, and can maintain stable structural performance in various environments. It is suitable for long-term use and test scenarios with high protection requirements. The inside of the shell of the test box 1 is filled with an insulation layer 101, and the insulation layer 101 is made of polyurethane foam, which helps to maintain a relatively stable temperature environment inside the test box 1 and reduce the interference of external environmental temperature changes on the test conditions in the box. In addition, the test box 1 is provided with a heat sink 102 at the position where the refrigeration unit 402 is installed, which can dissipate the heat generated by the refrigeration unit 402 in time, ensure that the refrigeration unit 402 can work normally and stably, and maintain the overall good temperature control function of the test box 1.

[0027] Please refer to the attached Figure 1 , 2 As shown in Figures 4 and 6, the test stand 2 is provided with a pressurizing unit 6, which includes an electric hydraulic jack 601. The output end of the electric hydraulic jack 601 is connected to a pressure plate 602. A rubber pad 603 is provided on the contact surface between the pressure plate 602 and the battery, and a pressure sensor 604 is also provided on the pressure plate 602. The pressure sensor 604 is electrically connected to the control system 9.

[0028] It should be noted that the pressurizing unit 6 equipped on the test stand 2 uses the electric hydraulic jack 601 as a pressure source, obtains the pressure data fed back by the pressure sensor 604 in real time through the control system 9, and then adjusts the working state of the electric hydraulic jack 601 according to the preset pressure parameters, applies pressure to the lithium battery, and thus tests the performance parameters of the lithium battery under different pressure conditions.

[0029] It should be noted that the synergistic effect of the pressurizing unit 6 and the temperature control component 4 can create a more complex, accurate and practical test environment for lithium batteries, simulating real working conditions, and accurately detecting the performance of lithium batteries in the corresponding environment, thereby ensuring the stable operation of related equipment in a specific pressure and temperature combination environment.

[0030] Please refer to the attached Figure 1 , 2, 4, 5, 6, and 7, the test box 1 is provided with a transfer mechanism 7, which includes a pair of parallel positioning cylinders 701, which are installed on the top of the side wall of the test box 1, and a rotating cylinder 702 is rotatably connected in the positioning cylinder 701, one end of the rotating cylinder 702 penetrates the side wall of the test box 1 and is transmission-connected to the driving mechanism 8, and the other end is rotationally connected to a threaded rod 703, and the end of the threaded rod 703 away from the rotating cylinder 702 is rotationally connected to the test frame 2 through a bearing seat 704. The driving mechanism 8 includes a housing 801, and a driving motor 802 is arranged in the housing 801, and a driving gear 803 is connected to the output end of the driving motor 802, and the driving gear 803 is transmission-connected to two driven gears 805 through a chain 804, and the driven gears 805 are respectively connected to the rotating cylinder 702.

[0031] It should be noted that a sealing door 201 is provided on the side of the test rack 2 away from the test box 1. The size of the sealing door 201 matches the inner cavity size of the test box 1, and a sealing insulation strip 202 is provided on the sealing door 201. In addition, two parallel dovetail grooves 103 are provided at the bottom of the test box 1, and a dovetail slider 203 corresponding to the dovetail groove 103 is provided at the bottom of the test rack 2.

[0032] It should be noted that when the driving motor 802 rotates, the driving gear 803 also rotates accordingly. The rotation of the driving gear 803 is transmitted to the two driven gears 805 through the chain 804, so that the rotating cylinder 702 rotates in the positioning cylinder 701. Since the threads of the threaded rod 703 match the threads in the rotating cylinder 702, the rotating cylinder 702 will drive the threaded rod 703 to translate in the rotating cylinder 702. Through the cooperation of the dovetail groove 103 and the dovetail slider 203, the transfer mechanism 7 can move the test frame 2 out of or into the test box 1 more smoothly and accurately.

[0033] Please refer to the attached Figure 8 As shown, a lithium battery performance testing method is used to test the performance of a lithium battery using a lithium battery performance testing device in the above technical solution, comprising the following steps: SP1. Place the battery. Place the lithium battery sample in the placement unit 3 on the test rack 2 and electrically connect it to the charge and discharge test system 5. Then move the test rack 2 into the test box 1 through the transfer mechanism 7. SP2, battery test, the control unit controls the temperature control component 4 and the pressurizing unit 6 to work, and the charge and discharge test system 5 detects the lithium battery sample to obtain the performance parameters of the lithium battery sample under different temperature and pressure environments; SP3, take out the battery, turn off the temperature control assembly 4, the pressurizing unit 6 and the charge and discharge test system 5 through the control system 9, and after the environment in the test box 1 returns to normal, move the test rack 2 out of the test box 1 through the transfer mechanism 7 and take out the lithium battery sample; SP4: Data analysis: Analyze and compare the performance parameters of the lithium battery samples obtained in SP2 with the performance parameters under normal conditions to obtain test conclusions.

[0034] The specific operation process of the present invention is as follows: The lithium battery sample to be tested is placed in the placement unit 3 of the test rack 2, and is electrically connected to the charge and discharge test system 5 in each placement unit 3, and then the driving motor 802 is started to drive the driving gear 803 to rotate, thereby transmitting the power to the two driven gears 805 through the chain 804, so that the rotating cylinder 702 rotates in the positioning cylinder 701, and then drives the threaded rod 703 to translate in the rotating cylinder 702, and through the cooperation of the dovetail groove 103 and the dovetail slider 203, the transfer mechanism 7 can move the test rack 2 into the test box 1; The temperature control component 4 and the pressurizing unit 6 are controlled by the control system 9 to create a test environment for lithium battery samples that meets the experimental requirements, and then the charge and discharge test system 5 is started to test the lithium battery samples to obtain the performance parameters of the lithium battery samples under different temperature and pressure environments; After the test is completed, the temperature control component 4, the pressurizing unit 6 and the charge-discharge test system 5 are turned off by the control system 9. After the environment in the test box 1 returns to normal, the test rack 2 is moved out of the test box 1 by the transfer mechanism 7, and the lithium battery samples are taken out from each placement unit 3; The performance parameters of the lithium battery samples recorded by the charge and discharge test system 5 under different temperature and pressure environments during the test, such as voltage curve, current change, capacity attenuation and other data are exported to professional data analysis software or spreadsheets, and compared with the performance parameters of the lithium battery under normal conditions (normal temperature, normal pressure, no charge and discharge test). Through drawing charts, statistical analysis and other methods, in-depth research is conducted on the effects of temperature and pressure on the performance of lithium batteries, such as battery capacity retention rate at high temperature, charge and discharge efficiency at low temperature, changes in internal resistance of batteries under different pressures, etc., to draw test conclusions and provide a scientific basis for the research and development, production and application of lithium batteries.

[0035] The above is an exemplary description of the present invention in combination with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A lithium battery performance testing device, comprising a test box (1), characterized in that: A test frame (2) is provided in the test box (1), and a plurality of placement units (3) are provided on the test frame (2); The placement units (3) are hollow cubic structures with openings at both ends, and are arranged in a rectangular shape in the test rack (2). A heat insulation board (301) is provided in the cell partition wall between adjacent placement units (3). In addition, each placement unit (3) is provided with an independently controlled temperature control component (4) and a charge and discharge test system (5); The temperature control component (4) comprises a heating unit (401) and a refrigeration unit (402), and the heating unit (401) is arranged on the left and right side walls of the placement unit (3); The refrigeration unit (402) is arranged on the front and rear inner walls corresponding to the test box (1) and the placement unit (3).

2. A lithium battery performance testing device according to claim 1, characterized in that: The heating unit (401) is a heating plate made of a composite of an electrical insulating material and a heating material, and its coverage area is designed according to the size of the placement unit (3) to ensure that sufficient heat can be provided inside the placement unit (3) so that the temperature inside the entire placement unit (3) can reach the high temperature environment of 30°C-60°C required by the test.

3. A lithium battery performance testing device according to claim 1, characterized in that: The refrigeration unit (402) is a semiconductor refrigeration chip, which is connected to the temperature control circuit to achieve precise control of the temperature in the placement unit (3) and quickly adjust the refrigeration capacity so that the temperature in the entire placement unit (3) can reach the -20°C-0°C low temperature environment required by the test.

4. A lithium battery performance testing device according to claim 1, characterized in that: The placement unit (3) is provided with a temperature sensor (302), the temperature sensor (302) is electrically connected to a control system (9), the control system (9) is also electrically connected to a temperature control component (4), and the heating unit (401) and the refrigeration unit (402) in the temperature control component (4) work in coordination under the action of the control system (9).

5. A lithium battery performance testing device according to claim 1, characterized in that: The test box (1) is a hollow cube with an opening at one end, and its outer shell is made of stainless steel. The interior of the outer shell of the test box (1) is filled with a heat insulation layer (101), and the heat insulation layer (101) is made of polyurethane foam. In addition, a heat sink (102) is provided at the position where the refrigeration unit (402) is installed in the test box (1).

6. A lithium battery performance testing device according to claim 1, characterized in that: The test stand (2) is provided with a pressurizing unit (6), the pressurizing unit (6) comprising an electric hydraulic jack (601), the output end of the electric hydraulic jack (601) being connected to a pressure plate (602), a contact surface between the pressure plate (602) and the battery being provided with a rubber pad (603), and a pressure sensor (604) being further provided on the pressure plate (602), the pressure sensor (604) being electrically connected to a control system (9).

7. A lithium battery performance testing device according to claim 1, characterized in that: The test box (1) is provided with a transfer mechanism (7), the transfer mechanism (7) comprising a pair of parallel positioning cylinders (701), the positioning cylinders (701) being mounted on the top of the side wall of the test box (1), and a rotating cylinder (702) being rotatably connected inside the positioning cylinder (701), one end of the rotating cylinder (702) passing through the side wall of the test box (1) being transmission-connected to a driving mechanism (8), and the other end of the rotating cylinder being rotatably connected to a threaded rod (703), and the end of the threaded rod (703) away from the rotating cylinder (702) being rotatably connected to the test frame (2) via a bearing seat (704).

8. A lithium battery performance testing device according to claim 7, characterized in that: The driving mechanism (8) comprises a housing (801), wherein a driving motor (802) is arranged in the housing (801), an output end of the driving motor (802) is connected to a driving gear (803), the driving gear (803) is connected to two driven gears (805) via a chain (804), and the driven gears (805) are respectively connected to the rotating cylinder (702).

9. A lithium battery performance testing device according to claim 1, characterized in that: A sealing door (201) is provided on a side of the test stand (2) away from the test box (1); the size of the sealing door (201) matches the size of the inner cavity of the test box (1), and a sealing heat insulation strip (202) is provided on the sealing door (201); in addition, two parallel dovetail grooves (103) are provided at the bottom of the test box (1), and a dovetail slider (203) corresponding to the dovetail grooves (103) is provided at the bottom of the test stand (2).

10. A lithium battery performance testing method, comprising a lithium battery performance testing device as claimed in claims 1 to 9, characterized in that: The following steps are involved: SP1. Place the battery: place the lithium battery sample in the placement unit (3) on the test rack (2) and electrically connect it to the charge and discharge test system (5), and then move the test rack (2) into the test box (1) through the transfer mechanism (7); SP2, battery testing, controlling the temperature control component (4) and the pressurizing unit (6) through the control system (9), and testing the lithium battery sample by the charge and discharge test system (5), to obtain the performance parameters of the lithium battery sample under different temperature and pressure environments; SP3, taking out the battery, shutting down the temperature control assembly (4), the pressurizing unit (6) and the charge and discharge test system (5) through the control system (9), and after the environment in the test box (1) returns to normal, moving the test rack (2) out of the test box (1) through the transfer mechanism (7), and taking out the lithium battery sample; SP4: Data analysis: Analyze and compare the performance parameters of the lithium battery samples obtained in SP2 with the performance parameters under normal conditions to obtain test conclusions.

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