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 provides a lithium battery performance testing device and a testing method therefor. Background Art

[0002] As an efficient energy carrier, lithium batteries are widely used in various electronic devices, such as imaging devices, communication devices, optical instruments, medical instruments, computers, mobile phones, etc. Before a lithium battery is put into use, it is necessary to conduct performance tests on it to simulate various situations during the use of the battery, so as to test various electrical performances and service life of the lithium battery.

[0003] The existing technology discloses a battery performance testing device and method. The battery performance testing device includes a box body, a controller, a temperature adjustment unit, a battery tester, and a liquid storage tank. The liquid storage tank stores a non-conductive coolant. The box body has a liquid inlet and a liquid outlet. The outlet of the liquid storage tank is communicated with the liquid inlet, and the liquid outlet is communicated with the inlet of the liquid storage tank. At least one fixture for fixing the battery to be tested is installed in the box body. The battery tester is installed outside the box body and is used for electrically connecting with the battery to be tested; the controller is electrically connected with the temperature adjustment unit to adjust the temperature of the coolant. This testing method can accurately simulate the normal temperature or cooling and temperature reduction conditions 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, and the overall test process takes a long time; and in actual use, the battery may also be subjected to external extrusion, and it is also necessary to conduct performance tests on the battery in this case. Summary of the Invention

[0005] The present invention mainly provides a lithium battery performance testing device and a testing method therefor, so as to solve the technical problems proposed in the above background art.

[0006] The technical solution adopted by the present invention to solve the above technical problems is as follows: A lithium battery performance testing device includes a test box, a test rack is arranged in the test box, and a plurality of placement units are arranged on the test rack; The placement unit is a hollow cube structure with openings at both ends. It is arranged in a rectangular array in the test rack, and an insulating layer is arranged in the unit 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] Further, a sealing door is provided on the side of the test rack away from the test chamber. The size of the sealing door matches the inner cavity size of the test chamber, and a sealing and heat-insulating strip is provided on the sealing door. In addition, two parallel dovetail grooves are opened at the bottom of the test chamber, and dovetail sliders corresponding to the dovetail grooves are provided at the bottom of the test rack.

[0015] A method for testing the performance of a lithium battery uses a lithium battery testing device in the above technical solution for testing, and includes the following steps: SP1. Place the battery. Put the lithium battery sample into the placement unit on the test rack and electrically connect it to the charge and discharge test system, and then move the test rack into the test chamber through the transfer mechanism. SP2. Battery testing. Control the temperature control component and the pressurizing unit to work through the control system, and the charge and discharge test system 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 component, the pressurizing unit and the charge and discharge test system through the control system. After the environment in the test chamber returns to normal, move the test rack out of the test chamber through the transfer mechanism and take out the lithium battery sample. SP4. Data analysis. Analyze and compare the performance parameters of the lithium battery sample obtained in SP2 with the performance parameters under normal conditions to obtain a test conclusion.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. Through the multiple placement units provided on the test rack of the present invention, multiple groups of samples can be tested simultaneously, and each placement unit is provided with a temperature control component and a charge and discharge test system with independent control, which can obtain the performance parameters of the lithium battery at different temperature gradients during the same test process, optimize the test process, and improve the test efficiency.

[0017] 2. The heating unit of the present invention is located on the left and right side walls of the placement unit, and the refrigeration unit is on the front and back walls of the test chamber. This layout, combined with the heat-insulating layer of the partition wall between adjacent placement units, can create a complex and diverse temperature field environment in the test chamber. It can not only simulate a single high-temperature or low-temperature environment, but also construct a temperature gradient scenario, such as simulating the temperature difference at different positions in the battery pack, which helps to deeply study the performance characteristics of the lithium battery under non-uniform temperature distribution, makes the test results more in line with the actual application scenario, and provides strong support for optimizing the battery pack thermal management system.

[0018] 3. The electric hydraulic jack is provided in the present invention to drive the pressure plate, and is equipped with a rubber pad and a pressure sensor, which can flexibly adjust the pressure magnitude through the control system to simulate different pressure environments. This enables full consideration of the pressure factors faced by the lithium battery during actual use when testing the performance of the lithium battery, thereby evaluating the influence of pressure on the performance parameters of the lithium battery and providing a basis for improving the reliability of the lithium battery under different mechanical stress environments.

[0019] The following will explain and illustrate the present invention in detail in combination with the accompanying drawings and specific embodiments. Brief Description of the Drawings

[0020] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the back of the overall structure of the present invention; Figure 3 is Figure 2 an enlarged view of part A in Figure 4 is a front sectional view of the test stand of the present invention; Figure 5 is a side sectional view of the test stand of the present invention; Figure 6 is a side sectional view of the test box of the present invention; Figure 7 is a side sectional view of the driving structure of the present invention; Figure 8 is a step diagram of the test method of the present invention.

[0021] Brief Description of the Drawings: 1. Test box; 101. Heat insulation layer; 102. Heat sink; 103. Dovetail groove; 2. Test stand; 201. Sealing door; 202. Sealing heat insulation strip; 203. Dovetail slider; 3. Placing unit; 301. Heat insulation board; 302. Temperature sensor; 4. Temperature control component; 401. Heating unit; 402. Refrigeration unit; 5. Charge and discharge test system; 6. Pressurizing 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 Embodiment

[0022] To facilitate the 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 disclosure of the present invention more thorough and comprehensive. Embodiment

[0023] Please refer specifically to the attached Figure 1 、 2 As shown in Figures 4 and 5, a lithium battery performance testing device includes a testing box 1. Inside the testing box 1, there is a testing rack 2. On the testing rack 2, there are multiple placement units 3. The placement unit 3 is a hollow cubic structure with openings at both ends, and it is arranged in a rectangular pattern within the testing rack 2. Moreover, within the unit partition wall between adjacent placement units 3, there is a heat insulation plate 301. In addition, each placement unit 3 is equipped with an independently controlled temperature control component 4 and a charge and discharge testing system 5. The temperature control component 4 includes 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 of the testing box 1 corresponding to the placement unit 3. Inside the placement unit 3, there is a temperature sensor 302. The temperature sensor 302 is electrically connected to a control system 9, and the control system 9 is also electrically connected to the temperature control component 4. The heating unit 401 and the refrigeration unit 402 within 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 refrigeration unit 402 work together within the placement unit, which can not only simulate a single high-temperature or low-temperature environment, but also construct a temperature gradient scenario to simulate the performance test of a lithium battery under an actual complex temperature field (such as uneven temperature distribution within a battery pack).

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

[0026] It should be noted that the test chamber 1 is a hollow cube with one end open, and its outer 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 test scenarios that require long-term use and high protection requirements. Moreover, the inner part of the outer shell of the test chamber 1 is filled with a heat insulation layer 101, which is made of polyurethane foam and helps to maintain a relatively stable temperature environment inside the test chamber 1, reducing the interference of external environmental temperature changes on the test conditions inside the chamber. In addition, a heat sink 102 is provided at the position where the refrigeration unit 402 is installed in the test chamber 1, which can timely dissipate the heat generated by the refrigeration unit 402, ensuring that the refrigeration unit 402 can work normally and stably, and maintaining the overall good temperature control function of the test chamber 1.

[0027] Please refer to Attachment Figure 1 、 2 As shown in FIGS. 4 and 6, the test rack 2 is provided with a pressurizing unit 6. The pressurizing unit 6 includes an electric hydraulic jack 601. The output end of the electric hydraulic jack 601 is connected with a pressure plate 602. A rubber pad 603 is provided on the contact surface between the pressure plate 602 and the battery. Moreover, a pressure sensor 604 is also provided on the pressure plate 602, and 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 rack 2 uses the electric hydraulic jack 601 as the pressure source, and obtains the pressure data fed back by the pressure sensor 604 in real time through the control system 9. Then, according to the preset pressure parameters, the working state of the electric hydraulic jack 601 is adjusted to apply pressure to the lithium battery, so as to test 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 test environment that conforms to the actual application scenario of the lithium battery, simulate real working conditions, and can accurately detect the performance of the lithium battery in the corresponding environment, ensuring the stable operation of related equipment in a specific pressure and temperature combination environment.

[0030] Please refer to Attachment Figure 1 、 2As shown in Figures 4, 5, 6, and 7, a transfer mechanism 7 is provided on the test chamber 1. The transfer mechanism 7 includes a pair of parallel positioning cylinders 701 installed at the top of the side wall of the test chamber 1. A rotating cylinder 702 is rotatably connected within the positioning cylinder 701. One end of the rotating cylinder 702 penetrates the side wall of the test chamber 1 and is drivingly connected to a driving mechanism 8, and the other end is rotatably connected to a threaded rod 703. The end of the threaded rod 703 away from the rotating cylinder 702 is rotatably connected to the test rack 2 through a bearing block 704. The driving mechanism 8 includes a housing 801. A driving motor 802 is provided within the housing 801. The output end of the driving motor 802 is connected to a driving gear 803. The driving gear 803 is drivingly 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 chamber 1. The size of the sealing door 201 matches the inner cavity size of the test chamber 1, and a sealing and heat insulation strip 202 is provided on the sealing door 201. In addition, two parallel dovetail grooves 103 are opened at the bottom of the test chamber 1, and dovetail sliders 203 corresponding to the dovetail grooves 103 are 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 within the positioning cylinder 701. Since the thread of the threaded rod 703 matches the thread within the rotating cylinder 702, the rotation of the rotating cylinder 702 will drive the threaded rod 703 to translate within 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 rack 2 out of or into the test chamber 1 more smoothly and accurately.

[0033] Please refer specifically to the attached Figure 8 As shown, a lithium battery performance testing method uses a lithium battery performance testing device in the above technical solution to test the performance of a lithium battery, including the following steps: SP1. Place the battery. Put the lithium battery sample into 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 chamber 1 through the transfer mechanism 7; SP2. Battery testing. Control the temperature control component 4 and the pressurizing unit 6 to work through the control unit, 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. Remove the battery. Turn off the temperature control component 4, the pressurizing unit 6, and the charge and discharge test system 5 through the control system 9. After the environment in the test chamber 1 returns to normal, move the test rack 2 out of the test chamber 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 testing box (1), characterized in that, A test rack (2) is provided inside the test chamber (1), and a plurality of placement units (3) are provided on the test rack (2); The placement unit (3) is a hollow cubic structure with openings at both ends. It is arranged in a rectangular pattern inside the test rack (2), and a heat insulation board (301) is provided inside the unit partition wall between adjacent placement units (3). In addition, each placement unit (3) is provided with a temperature control component (4) and a charge-discharge test system (5) that are independently controlled; The temperature control component (4) includes 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); The refrigeration unit (402) is arranged on the front and rear inner walls of the test chamber (1) corresponding to the placement unit (3).

2. The lithium battery performance testing device according to claim 1, characterized in that, The heating unit (401) is a heating sheet composed of a composite of an electrically insulating material and a heat-generating material. 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 for testing.

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

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

5. The performance testing device for a lithium battery according to claim 1, wherein The test chamber (1) is a hollow cube with an opening at one end. Its outer shell is made of stainless steel, and a heat insulation layer (101) is filled inside the outer shell of the test chamber (1). 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 on the test chamber (1).

6. A lithium battery performance testing device according to claim 1, wherein The test rack (2) is provided with a pressurizing unit (6). The pressurizing unit (6) 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).

7. A lithium battery performance testing device according to claim 1, characterized in that A transfer mechanism (7) is provided on the test chamber (1). The transfer mechanism (7) includes a pair of parallel positioning cylinders (701). The positioning cylinders (701) are installed at the top of the side wall of the test chamber (1). A rotating cylinder (702) is rotatably connected inside the positioning cylinder (701). One end of the rotating cylinder (702) penetrates the side wall of the test chamber (1) and is drivingly connected to a driving mechanism (8), and the other end is rotatably connected to a threaded rod (703). The end of the threaded rod (703) away from the rotating cylinder (702) is rotatably connected to the test rack (2) through a bearing seat (704).

8. A lithium battery performance testing device according to claim 7, characterized in that, The driving mechanism (8) includes a housing (801). A driving motor (802) is provided inside the housing (801). The output end of the driving motor (802) is connected to a driving gear (803). The driving gear (803) is drivingly connected to two driven gears (805) through a chain (804). 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 one side of the test rack (2) away from the test chamber (1). The size of the sealing door (201) matches the inner cavity size of the test chamber (1). A sealing and heat-insulating strip (202) is provided on the sealing door (201). In addition, two parallel dovetail grooves (103) are opened at the bottom of the test chamber (1). Dovetail sliders (203) corresponding to the dovetail grooves (103) are provided at the bottom of the test rack (2).

10. A method for testing the performance of a lithium battery, including a lithium battery performance testing device as described in claims 1-9, characterized in that, It includes the following steps: SP1. Place the battery. Put the lithium battery sample into 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 chamber (1) through the transfer mechanism (7). SP2. Battery test. Control the temperature control component (4) and the pressurizing unit (6) to work through the control system (9). 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 component (4), the pressurizing unit (6) and the charge and discharge test system (5) through the control system (9). After the environment in the test chamber (1) returns to normal, move the test rack (2) out of the test chamber (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 sample obtained in SP2 with the performance parameters under normal conditions to obtain the test conclusion.

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