Lithium battery performance test system and non-uniform pressurizing device thereof

Abstract

The utility model relates to a lithium battery performance test system and a non-uniform pressurizing device thereof. The non-uniform pressurizing device comprises a mounting part and a non-uniform pressurizing part. The mounting component comprises a first mounting plate and a second mounting plate which are oppositely arranged and connected with each other. The non-uniform pressurizing part is arranged between the first mounting plate and the second mounting plate and comprises at least two pressurizing mechanisms, one ends of the pressurizing mechanisms are connected with the first mounting plate, the other ends of the pressurizing mechanisms are provided with pressurizing plates, the pressurizing plates and the second mounting plate are arranged at intervals, and lithium batteries are placed between the pressurizing plates and the second mounting plate; and each pressurizing mechanism is used for applying different pressures to the lithium battery. Different pressure is applied to different areas of the lithium battery through different pressurizing mechanisms, so that non-uniform pressurizing on the lithium battery is realized. The lithium battery performance test system can test different areas of the square shell type lithium battery under different pressures.

Description

Technical Field

[0001] The present application relates to the technical field of battery quality control and safety, and in particular to a lithium battery performance testing system and an uneven pressurization device thereof. Background Art

[0002] Faced with the global challenges of increasingly depleted fossil energy and worsening air pollution, the research and development and application of new energy technologies have become the key to promoting the development of mobile energy. The popularity and development of electric vehicles depends to a large extent on the progress of battery technology. Prismatic lithium batteries have been widely used in various power tools, electric vehicles and portable devices due to their significant advantages such as simple structure, light weight, high energy density, high power density and low self-discharge rate.

[0003] In actual use, square-shell lithium batteries are often affected by uneven external pressure, which may cause damage to the internal structure of the battery and performance degradation, thereby affecting its safety and performance. In order to ensure the reliability of battery energy storage, it is very important to conduct pre-delivery testing on square-shell lithium batteries.

[0004] However, the related art can only implement the testing of square shell batteries under uniform pressure, and cannot implement the testing of square shell lithium batteries under different pressures applied to different regions. Utility Model Content

[0005] Based on this, it is necessary to provide a lithium battery performance testing system and its uneven pressurization device to address the problem in the related art that it is impossible to test different areas of a square shell type lithium battery under different pressures.

[0006] A non-uniform pressurizing device, comprising:

[0007] The mounting component comprises a first mounting plate and a second mounting plate which are arranged opposite to each other and connected to each other, wherein the second mounting plate is used for placing a lithium battery;

[0008] An uneven pressure component is arranged between the first mounting plate and the second mounting plate. The uneven pressure component includes at least two pressure mechanisms. One end of the pressure mechanism is connected to the first mounting plate, and the other end is provided with a pressure plate. The pressure plate and the second mounting plate are arranged at intervals and lithium batteries are placed between the two. Each of the pressure mechanisms is used to apply different pressures to the lithium batteries.

[0009] In one embodiment, the at least two pressurizing mechanisms include a first pressurizing mechanism and a second pressurizing mechanism, a through hole is opened in the pressurizing plate of the first pressurizing mechanism, and the pressurizing plate of the second pressurizing mechanism can extend into the through hole to pressurize the lithium battery.

[0010] In one of the embodiments, at least one of the pressurizing mechanisms is a first pressurizing mechanism, which includes a fixed plate, a first guide rod, a pressurizing nut threadedly connected to the first guide rod, and a first elastic member sleeved outside the first guide rod. The fixed plate and the pressurizing plate are arranged opposite to each other, the first guide rod passes through the fixed plate and the pressurizing plate in sequence, one end of the first guide rod is connected to the second mounting plate, the pressurizing nut is located on a side of the fixed plate away from the pressurizing plate, and both ends of the first elastic member are respectively connected to the fixed plate and the pressurizing plate.

[0011] In one of the embodiments, at least one of the pressurizing mechanisms is a second pressurizing mechanism, and the second pressurizing mechanism includes a screw, and the screw is threadedly connected to the first mounting plate, and the pressurizing plate is provided at one end of the screw away from the first mounting plate.

[0012] In one embodiment, the first mounting plate includes a frame and a connecting plate disposed in the frame, one end of the first guide rod is connected to the connecting plate, and the other end is connected to the second mounting plate, and the screw rod is threadedly connected to the connecting plate.

[0013] In one embodiment, the second pressurizing mechanism further includes a connecting block and a second elastic member, wherein the connecting block is disposed at an end of the screw rod away from the first mounting plate, and the connecting block is connected to the pressurizing plate via the second elastic member.

[0014] In one embodiment, there are multiple second pressurizing mechanisms.

[0015] In one embodiment, the mounting component includes a second guide rod and a locking nut cooperating with the second guide rod, the second guide rod passes through the first mounting plate and the second mounting plate in sequence, and the locking nut is respectively provided on a side of the first mounting plate away from the second mounting plate and a side of the second mounting plate away from the first mounting plate.

[0016] In one embodiment, the surface of the pressure plate close to the second mounting plate is uneven.

[0017] A lithium battery performance testing system, the lithium battery performance testing system comprising:

[0018] A non-uniform pressurizing device, wherein the non-uniform pressurizing device is used to pressurize the lithium battery;

[0019] A pressure sensor, used to be arranged on the pressure-bearing surface of the lithium battery;

[0020] A microprocessor, electrically connected to the pressure sensor, and configured to convert and process data detected by the pressure sensor;

[0021] A charger and discharger, electrically connected to the microprocessor and the lithium battery, for receiving a signal from the microprocessor and cyclically charging and discharging the lithium battery according to the signal;

[0022] The electrochemical workstation is electrically connected to the microprocessor and the lithium battery, and is used for real-time detection of test data inside the lithium battery and transmission of the test data to the microprocessor.

[0023] The above-mentioned lithium battery performance test system and its uneven pressurization device are provided with at least two pressurization mechanisms, each of which is used to apply different pressures to the lithium battery, and each pressurization mechanism is respectively in contact with different areas of the lithium battery through a pressurization plate, that is, different pressures are applied to different areas of the lithium battery by different pressurization mechanisms, thereby achieving uneven pressurization of the lithium battery. When the square shell lithium battery is placed on the second mounting plate, different areas of the square shell lithium battery can be tested under different pressures, which is convenient for studying the influence of uneven pressure on the performance of the square shell lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the structure of a non-uniform pressurizing device in one embodiment.

[0025] Figure 2 Schematic diagram of the structure of the uneven pressure component in one embodiment.

[0026] Figure 3 4 is a system diagram of a lithium battery performance testing system in one embodiment.

[0027] Reference numerals: 100, mounting component; 110, first mounting plate; 111, frame; 112, connecting plate; 120, second mounting plate; 130, second guide rod; 140, locking nut; 201, pressure sensor; 202, amplifier circuit; 203, A / D converter; 204, microprocessor; 205, read-only memory; 206, detection device; 206a, charging and discharging machine; 206b, electrochemical workstation; 207, The first interface; 208, external device; 209, second interface; 210, LCD display; 211, bus; 212, PC terminal; 300, first pressurizing mechanism; 310, fixing plate; 320, first pressurizing plate; 330, first guide rod; 340, pressurizing nut; 350, first elastic member; 400, second pressurizing mechanism; 410, screw rod; 420, second pressurizing plate; 430, connecting block; 440, second elastic member. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0029] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0030] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0032] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0034] See also Figure 1 and Figure 2 The uneven pressure device provided by one embodiment of the present application includes a mounting component 100 and an uneven pressure component. The mounting component 100 includes a first mounting plate 110 and a second mounting plate 120 that are arranged opposite to each other and connected to each other. The uneven pressure component is arranged between the first mounting plate 110 and the second mounting plate 120, and the uneven pressure component includes at least two pressure mechanisms, one end of the pressure mechanism is connected to the first mounting plate 110, and the other end is provided with a pressure plate, the pressure plate and the second mounting plate 120 are spaced apart and a lithium battery is placed between the two, and each pressure mechanism is used to apply different pressures to the lithium battery.

[0035] In this embodiment, at least two pressurizing mechanisms are provided, each of which is used to apply different pressures to the lithium battery, and each of which is in contact with different regions of the lithium battery through a pressurizing plate, that is, different pressures are applied to different regions of the lithium battery by different pressurizing mechanisms, thereby achieving uneven pressurization of the lithium battery. When the square-shell lithium battery is placed on the second mounting plate 120, different regions of the square-shell lithium battery can be tested under different pressures, which is convenient for studying the influence of uneven pressure on the performance of the square-shell lithium battery.

[0036] In some embodiments, at least two pressurizing mechanisms include a first pressurizing mechanism 300 and a second pressurizing mechanism 400. A through hole is provided in the pressurizing plate of the first pressurizing mechanism 300, and the pressurizing plate of the second pressurizing mechanism 400 can extend into the through hole to pressurize the lithium battery.

[0037] In this embodiment, the pressurizing plate of the first pressurizing mechanism 300 is the first pressurizing plate 320, and the pressurizing plate of the second pressurizing mechanism 400 is the second pressurizing plate 420. The lithium battery can be fixed on the second mounting plate 120 by the first pressurizing plate 320, and the first pressurizing plate 320 can apply a first pressure to the entire lithium battery, and the second pressurizing plate 420 is used to apply a second pressure to a local area of ​​the lithium battery through the through hole, thereby applying different pressures to different areas of the lithium battery, which is convenient for studying the influence of uneven pressure on the performance of the lithium battery.

[0038] In some embodiments, at least one pressurizing mechanism is a first pressurizing mechanism 300, which includes a fixed plate 310, a first guide rod 330, a pressurizing nut 340 threadedly connected to the first guide rod 330, and a first elastic member 350 sleeved outside the first guide rod 330. The fixed plate 310 and the pressurizing plate are arranged opposite to each other, the first guide rod 330 passes through the fixed plate 310 and the pressurizing plate in sequence, one end of the first guide rod 330 is connected to the second mounting plate 120, the pressurizing nut 340 is located on the side of the fixed plate 310 away from the pressurizing plate, and the two ends of the first elastic member 350 are respectively connected to the fixed plate 310 and the pressurizing plate.

[0039] In this embodiment, the pressure plate of the first pressure mechanism 300 is the first pressure plate 320, the first elastic member 350 is arranged between the fixed plate 310 and the first pressure plate 320, the first guide rod 330 passes through the fixed plate 310, the first elastic member 350 and the first pressure plate 320 in sequence, and the two ends of the first elastic member 350 are respectively connected to the fixed plate 310 and the pressure plate, and the pressure nut 340 is located on the side of the fixed plate 310 away from the first elastic member 350. When the pressure nut 340 is tightened, the pressure nut 340 can push the first pressure plate 320 to move downward through the fixed plate 310 and the first elastic member 350 in sequence until the first pressure plate 320 contacts the lithium battery. When the pressure nut 340 is further tightened, the first elastic member 350 is compressed, so that the lithium battery is pressurized through the first pressure plate 320 and the lithium battery is fixed on the second mounting plate 120. That is, by adjusting the compression length of the first elastic member 350 , the magnitude of the force applied to the lithium battery can be controlled.

[0040] In some other embodiments, at least one pressurizing mechanism is a second pressurizing mechanism 400 , which includes a screw 410 threadedly connected to the first mounting plate 110 , and a pressurizing plate is provided at one end of the screw 410 away from the first mounting plate 110 .

[0041] In this embodiment, the pressurizing plate of the second pressurizing mechanism 400 is a second pressurizing plate 420. A threaded hole is provided on the first mounting plate 110, and the screw 410 cooperates with the threaded hole. When the screw 410 is rotated, the second pressurizing plate 420 can be driven by the screw 410 to move toward the side close to the second mounting plate 120, thereby pressurizing the lithium battery on the second mounting plate 120.

[0042] Furthermore, the second pressurizing mechanism further includes a connecting block 430 and a second elastic member 440. The connecting block 430 is disposed at one end of the screw 410 away from the first mounting plate 110, and the connecting block 430 is connected to the pressurizing plate via the second elastic member 440. The connecting block 430 is made of rubber to reduce damage to the lithium battery.

[0043] That is, the second elastic member 440 is provided to prevent the lithium battery from being damaged when the pressure of the pressurizing mechanism is too high. A nut is fixed at one end of the screw 410 to facilitate the rotation of the screw 410. During actual pressurization, the screw 410 moves downward by rotating the nut on the screw 410, pushing the connecting block 430, the second elastic member 440, and the second pressurizing plate 420 downward. When the second pressurizing plate 420 contacts the top of the square-shell lithium battery, the nut on the screw 410 continues to be rotated, and the second elastic member 440 begins to compress, and a different pressure is applied to the set area of ​​the square-shell lithium battery through the second pressurizing plate 420.

[0044] Specifically, a through hole is provided on the second pressurizing plate 420, and the first pressurizing plate 320 passes through the through hole to pressurize the lithium battery. A through hole is provided on the fixing plate 310, and the screw 410 of the second pressurizing mechanism 400 passes through the through hole, and a clearance fit is provided between the screw 410 and the through hole to prevent the friction between the screw 410 and the through hole from causing the pressure of the first pressurizing mechanism 300 to change when the screw 410 is rotated to pressurize, thereby affecting the test results.

[0045] In some embodiments, the mounting component 100 includes a second guide rod 130 and a locking nut 140 that cooperates with the second guide rod 130. The second guide rod 130 passes through the first mounting plate 110 and the second mounting plate 120 in sequence. The locking nuts 140 are respectively provided at one end of the first mounting plate 110 away from the second mounting plate 120 and the other end of the second mounting plate 120 away from the first mounting plate 110.

[0046] In this embodiment, by adjusting the locking nut 140 on the first mounting plate 110 or the locking nut 140 on the second mounting plate 120, the relative position of the first mounting plate 110 and the second mounting plate 120 can be adjusted, thereby accommodating lithium batteries of different sizes.

[0047] In some other embodiments, the first mounting plate 110 includes a frame 111 and a connecting plate 112 disposed in the frame 111 , one end of the first guide rod 330 is connected to the connecting plate 112 , and the other end is connected to the second mounting plate 120 , and the screw 410 is threadedly connected to the connecting plate 112 .

[0048] During the experiment, the mounting component 100 is fixed on the test bench. Specifically, the frame 111 and the second mounting plate 120 of the mounting component 100 are fixed on the test bench, and the lithium battery is set on the second mounting plate 120. The connecting plate 112 is connected to the first guide rod 330, and the frame 111 and the connecting plate 112 are not connected, so that the first pressurizing mechanism 300 of different sizes can be replaced according to the size of the battery. One end of the first guide rod 330 is connected to the connecting plate 112, and the other end is connected to the second mounting plate 120, that is, the connecting plate 112 can be fixed by the first guide rod 330. When the screw rod 410 is rotated, the screw rod 410 can drive the second pressurizing plate 420 to approach the second mounting plate 120, thereby pressurizing the lithium battery located on the second mounting plate 120.

[0049] In some embodiments, there are multiple second pressurizing mechanisms 400 .

[0050] Each of the second pressurizing mechanisms 400 has a second pressurizing plate 420 , and the through hole on the first pressurizing mechanism 300 is used to accommodate a plurality of second pressurizing plates 420 , so as to apply different pressures to a plurality of different regions of the battery block at the same time.

[0051] In some embodiments, the surface of the pressurizing plate adjacent to the second mounting plate 120 is uneven.

[0052] In this embodiment, when the pressure plate applies pressure to the lithium battery, since the surface of the pressure plate close to the second mounting plate 120 is uneven, the pressure plate of the same pressure mechanism can apply multiple pressures to the lithium battery respectively, which is convenient for testing the performance of the lithium battery under multiple uneven conditions.

[0053] The uneven pressure device of the present application can be used to apply uneven pressure to a square-shell lithium battery. The mounting component 100 is used to fix the square-shell lithium battery on a test bench, and at least two uneven pressure components are arranged in the mounting component 100 to apply different pressures to different areas of the square-shell lithium battery on the second mounting plate 120.

[0054] Compared with the related art, the present invention can apply different pressure values ​​to partial areas through the second pressurizing mechanism 400 to simulate uneven pressure conditions on the basis of uniformly pressurizing the entire square shell lithium battery through the first pressurizing mechanism 300. The height of the fixing plate 310 and the pressurizing plate of the second pressurizing mechanism 400 can be adjusted to adapt to the measurement of square shell batteries of different sizes, further improving the versatility of the uneven pressurizing device.

[0055] In addition, the battery is pressurized and fixed by the first pressurizing mechanism 300, and a through hole is opened on the first pressurizing plate 320 of the first pressurizing mechanism 300. The second pressurizing plate 420 extends into the through hole to pressurize the lithium battery, ensuring that the position of the uneven pressure application area is fixed in each experiment, with high repeatability and no errors caused by position offset.

[0056] In some embodiments, see Figure 3 , an embodiment of the present application further provides a lithium battery performance testing system comprising:

[0057] An uneven pressurizing device, used to fix the lithium battery on the test bench and pressurize the lithium battery;

[0058] A pressure sensor 201 is used to be arranged on the pressure-bearing surface of the lithium battery;

[0059] The microprocessor 204 is electrically connected to the pressure sensor 201 and is used to convert and process the data detected by the pressure sensor 201;

[0060] The charger / discharger 206a is electrically connected to the microprocessor 204 and the lithium battery, and is used to receive signals from the microprocessor 204 and cyclically charge and discharge the lithium battery according to the signals;

[0061] The electrochemical workstation 206b is electrically connected to the microprocessor 204 and the lithium battery, and is used to detect and record relevant test data such as the current value, capacitance value, voltage value, energy value, etc. inside the square shell lithium battery in real time.

[0062] The specific test process is as follows: the lithium battery is fixed by an uneven pressure device, and after pressure is applied, when the pressure sensor 201 shows that the pressure value of each area on the lithium battery reaches the set working condition, the microprocessor 204 controls the charger and discharger 206a and the electrochemical workstation 206b to start at the same time to perform a cycle test on the square shell lithium battery.

[0063] The performance detection system further includes an amplifier circuit 202, an A / D converter 203, a read-only memory 205, a detection device 206, a first interface 207, an external device 208, a second interface 209, an LCD display 210, a bus 211, and a PC terminal 212. The pressure sensor 201 detects stress changes in the lithium battery and converts non-electrical pressure signals into voltage signals; the amplifier circuit 202 is electrically connected to the pressure sensor 201, and amplifies the voltage signal converted by the pressure sensor 201 to make the analog signal suitable for the voltage conversion range of the A / D converter 203; the A / D converter 203 is electrically connected to the amplifier circuit 202, and is used to convert the analog signal into a digital signal; the microprocessor 204 is electrically connected to the A / D converter 203, and collects the digital signal output by the A / D converter 203, and performs analysis, judgment, calculation, and other processing to obtain the measured value. Results; the read-only memory 205 is electrically connected to the microprocessor 204 for expanding the storage capacity of the microprocessor 204; the external device 208 is electrically connected to the microprocessor 204 via the first interface 207, and the performance detection system is controlled through the external device input; the LCD display 210 is electrically connected to the microprocessor 204 via the second interface 209, and the measurement results of the microprocessor 204 are displayed; the signal output by the microprocessor 204 is electrically connected to the PC terminal 212 via the bus 211 after level conversion, and the PC terminal 212 can perform subsequent processing on the data and realize the control of the performance detection system.

[0064] The charger and discharger 206a and the electrochemical workstation 206b are the detection device 206. When the pressure sensor 201 shows that the pressure value of each part of the lithium battery reaches the set working condition, the microprocessor 204 controls the detection device 206 to start, that is, the charger and discharger 206a and the electrochemical workstation 206b are turned on at the same time to perform a cycle test on the square shell type lithium battery. The charger and discharger 206a is electrically connected to the microprocessor 204, and has a constant current and constant voltage charging and discharging function, which is used to perform a cycle test under the set working condition; the electrochemical workstation 206b is electrically connected to the microprocessor 204, and is used to detect and record the current value, capacitance value, voltage value, energy value and other related test data inside the square shell type lithium battery in real time. The PC terminal 212 performs subsequent analysis and processing on the output test data and draws a change curve chart. According to the curve chart, it can be judged that the uneven pressure has an impact on the safety and performance of the square shell type lithium battery.

[0065] In addition, based on the test data, it is also possible to verify the impact of replacing the positive and negative electrode materials, replacing the diaphragm, replacing the electrolyte, adjusting the production process and other parameters on the battery; and on this basis, verify the impact of different charging strategies and different cycle systems on the safety and performance of square shell lithium batteries, providing a reliable experimental basis and reference basis for subsequent research, which will help promote the further development of battery technology and improve the safety and performance of lithium batteries.

[0066] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A non-uniform pressurizing device, characterized in that: The uneven pressurizing device comprises: A mounting component (100) comprising a first mounting plate (110) and a second mounting plate (120) which are arranged opposite to each other and connected to each other; An uneven pressure component is arranged between the first mounting plate (110) and the second mounting plate (120), and the uneven pressure component includes at least two pressure mechanisms, one end of the pressure mechanism is connected to the first mounting plate (110), and the other end is provided with a pressure plate, the pressure plate and the second mounting plate (120) are arranged at a distance and a lithium battery is placed between the two, and each of the pressure mechanisms is used to apply different pressures to the lithium battery.

2. The uneven pressure device according to claim 1, characterized in that: The at least two pressurizing mechanisms include a first pressurizing mechanism (300) and a second pressurizing mechanism (400), wherein a through hole is provided in a pressurizing plate of the first pressurizing mechanism (300), and the pressurizing plate of the second pressurizing mechanism (400) can extend into the through hole to pressurize the lithium battery.

3. The uneven pressurizing device according to claim 1, characterized in that: At least one of the pressurizing mechanisms is a first pressurizing mechanism (300), and the first pressurizing mechanism (300) includes a fixed plate (310), a first guide rod (330), a pressurizing nut (340) threadedly connected to the first guide rod (330), and a first elastic member (350) sleeved outside the first guide rod (330), the fixed plate (310) and the pressurizing plate are arranged opposite to each other, the first guide rod (330) passes through the fixed plate (310) and the pressurizing plate in sequence, one end of the first guide rod (330) is connected to the second mounting plate (120), the pressurizing nut (340) is located on a side of the fixed plate (310) away from the pressurizing plate, and both ends of the first elastic member (350) are respectively connected to the fixed plate (310) and the pressurizing plate.

4. The uneven pressurizing device according to claim 3, characterized in that: At least one of the pressurizing mechanisms is a second pressurizing mechanism (400), and the second pressurizing mechanism (400) includes a screw (410), and the screw (410) is threadedly connected to the first mounting plate (110), and the pressurizing plate is provided at one end of the screw (410) away from the first mounting plate (110).

5. The uneven pressurizing device according to claim 4, characterized in that: The first mounting plate (110) comprises a frame (111) and a connecting plate (112) arranged in the frame (111); one end of the first guide rod (330) is connected to the connecting plate (112), and the other end is connected to the second mounting plate (120); the screw rod (410) is threadedly connected to the connecting plate (112).

6. The uneven pressurizing device according to claim 4, characterized in that: The second pressurizing mechanism (400) further comprises a connecting block (430) and a second elastic member (440), wherein the connecting block (430) is arranged at one end of the screw rod (410) away from the first mounting plate (110), and the connecting block (430) is connected to the pressurizing plate via the second elastic member (440).

7. The uneven pressurizing device according to claim 4, characterized in that: The number of the second pressurizing mechanisms (400) is plural.

8. The uneven pressurizing device according to claim 1, characterized in that: The mounting component (100) comprises a second guide rod (130) and a locking nut (140) matched with the second guide rod (130); the second guide rod (130) passes through the first mounting plate (110) and the second mounting plate (120) in sequence; the locking nut (140) is respectively arranged on a side of the first mounting plate (110) away from the second mounting plate (120) and a side of the second mounting plate (120) away from the first mounting plate (110).

9. The uneven pressurizing device according to claim 1, characterized in that: The surface of the pressure plate close to the second mounting plate (120) is uneven.

10. A lithium battery performance testing system, characterized in that: The lithium battery performance testing system comprises: The non-uniform pressurizing device according to any one of claims 1 to 9, wherein the non-uniform pressurizing device is used to pressurize a lithium battery; A pressure sensor (201), configured to be arranged on a pressure-bearing surface of the lithium battery; A microprocessor (204) is electrically connected to the pressure sensor (201) and is used to convert and process data detected by the pressure sensor (201); A charger and discharger (206a), electrically connected to the microprocessor (204) and the lithium battery, for receiving signals from the microprocessor (204) and cyclically charging and discharging the lithium battery according to the signals; The electrochemical workstation (206b) is electrically connected to the microprocessor (204) and the lithium battery, and is used to detect test data inside the lithium battery in real time and transmit the test data to the microprocessor (204).

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