CN222671568U - Lithium battery performance test system and nonuniform pressurizing device thereof - Google Patents
Lithium battery performance test system and nonuniform pressurizing device thereof Download PDFInfo
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- CN222671568U CN222671568U CN202420624068.6U CN202420624068U CN222671568U CN 222671568 U CN222671568 U CN 222671568U CN 202420624068 U CN202420624068 U CN 202420624068U CN 222671568 U CN222671568 U CN 222671568U
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Abstract
本申请涉及一种锂电池性能测试系统及其不均匀加压装置。不均匀加压装置包括安装部件和不均匀加压部件。安装部件包括相对设置的且相互连接的第一安装板和第二安装板。不均匀加压部件设置在第一安装板与第二安装板之间，不均匀加压部件包括至少两个加压机构，加压机构的一端与第一安装板连接，另一端设置有加压板，加压板与第二安装板间隔设置且两者之间用于放置锂电池，每个加压机构分别用于向锂电池施加不同的压力。通过不同的加压机构对锂电池的不同区域施加不同的压力，从而实现对锂电池的不均匀加压。锂电池性能测试系统可实现方壳型锂电池的不同区域在不同压力下的测试。
The present application relates to a lithium battery performance testing system and an uneven pressurizing device thereof. The uneven pressurizing device includes a mounting component and an uneven pressurizing component. The mounting component includes a first mounting plate and a second mounting plate that are arranged opposite to each other and connected to each other. The uneven pressurizing component is arranged between the first mounting plate and the second mounting plate, and the uneven pressurizing component includes at least two pressurizing mechanisms, one end of the pressurizing mechanism is connected to the first mounting plate, and a pressurizing plate is arranged at the other end. The pressurizing plate and the second mounting plate are arranged at intervals and the lithium battery is placed between the two, and each pressurizing mechanism is used to apply different pressures to the lithium battery. Different pressures are applied to different areas of the lithium battery by different pressurizing mechanisms, thereby achieving uneven pressurization of the lithium battery. The lithium battery performance testing system can realize the testing of different areas of the square shell lithium battery under different pressures.
Description
Technical Field
The application relates to the technical field of battery quality control and safety, in particular to a lithium battery performance test system and an uneven pressurizing device thereof.
Background
Under the global challenges of increasingly exhausting fossil energy and exacerbating air pollution, the development and application of new energy technologies are key to promoting the development of mobile energy. The popularity and development of electric vehicles is largely dependent on advances in battery technology. Square shell lithium batteries have been widely used in various electric tools, electric vehicles and portable devices because of their remarkable advantages of simple structure, light weight, high energy density, high power density, low self-discharge rate, etc.
In practical use, square-shell lithium batteries are often affected by external uneven pressure, which may cause damage to the internal structure of the battery and performance degradation, thereby affecting the safety and service performance thereof. In order to ensure the reliability of battery energy storage, it is important to carry out a detection experiment before leaving the factory on the square shell type lithium battery.
However, in the related art, only the test of the battery with the opposite case under the uniform pressure can be realized, and the test of the battery with the opposite case under the different pressures applied to the different areas of the battery with the opposite case cannot be realized.
Disclosure of utility model
Based on this, it is necessary to provide a lithium battery performance test system and an uneven pressurizing device thereof, aiming at the problem that the test under different pressures applied to different areas of a square-shell lithium battery cannot be realized in the related art.
An uneven pressurizing device, the uneven pressurizing device comprising:
The mounting component comprises a first mounting plate and a second mounting plate which are oppositely arranged and connected with each other, and the second mounting plate is used for placing a lithium battery;
The non-uniform pressurizing component 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 are arranged at intervals with the second mounting plate, 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 batteries.
In one embodiment, the at least two pressurizing mechanisms include a first pressurizing mechanism and a second pressurizing mechanism, a through hole is formed in a 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.
In one embodiment, at least one of the pressurizing mechanisms is a first pressurizing mechanism, the first pressurizing mechanism comprises a fixing plate, a first guide rod, a pressurizing nut in threaded connection with the first guide rod and a first elastic piece sleeved outside the first guide rod, the fixing plate and the pressurizing plate are oppositely arranged, the first guide rod sequentially penetrates through the fixing plate and the pressurizing plate, one end of the first guide rod is connected with the second mounting plate, the pressurizing nut is located on one side, far away from the pressurizing plate, of the fixing plate, and two ends of the first elastic piece are respectively connected with the fixing plate and the pressurizing plate.
In one embodiment, at least one of the pressurizing mechanisms is a second pressurizing mechanism, the second pressurizing mechanism comprises a screw rod, the screw rod is in threaded connection with the first mounting plate, and the pressurizing plate is arranged at one end, away from the first mounting plate, of the screw rod.
In one embodiment, the first mounting plate comprises a frame body and a connecting plate arranged in the frame body, one end of the first guide rod is connected with the connecting plate, the other end of the first guide rod is connected with the second mounting plate, and the screw rod is in threaded connection with the connecting plate.
In one embodiment, the second pressurizing mechanism further comprises a connecting block and a second elastic piece, the connecting block is arranged at one end of the screw far away from the first mounting plate, and the connecting block is connected with the pressurizing plate through the second elastic piece.
In one embodiment, the number of the second pressurizing mechanisms is plural.
In one embodiment, the mounting component comprises a second guide rod and a locking nut matched with the second guide rod, the second guide rod sequentially penetrates through the first mounting plate and the second mounting plate, and the locking nut is respectively arranged on one side, away from the second mounting plate, of the first mounting plate and one side, away from the first mounting plate, of the second mounting plate.
In one embodiment, the pressure plate is rugged near the surface of the second mounting plate.
A lithium battery performance testing system, the lithium battery performance testing system comprising:
the non-uniform pressurizing device is used for pressurizing the lithium battery;
A pressure sensor for being arranged on the pressed surface of the lithium battery;
The microprocessor is electrically connected with the pressure sensor and is used for converting the data detected by the pressure sensor;
The charging and discharging machine is electrically connected with the microprocessor and the lithium battery at the same time and is used for receiving signals of the microprocessor and circularly charging and discharging the lithium battery according to the signals;
and the electrochemical working station is electrically connected with the microprocessor and the lithium battery at the same time and is used for detecting the test data in the lithium battery in real time and transmitting the test data to the microprocessor.
According to the lithium battery performance test system and the non-uniform pressurizing device thereof, at least two pressurizing mechanisms are arranged, each pressurizing mechanism is used for applying different pressures to the lithium battery, each pressurizing mechanism is respectively abutted with different areas of the lithium battery through the pressurizing plate, namely, different pressurizing mechanisms are used for applying different pressures to different areas of the lithium battery, and therefore non-uniform pressurizing of the lithium battery is achieved. When the square shell type lithium battery is placed on the second mounting plate, the test of different areas of the square shell type lithium battery under different pressures can be realized, and the influence of the pressure non-uniformity on the performance of the square shell type lithium battery can be conveniently studied.
Drawings
FIG. 1 is a schematic diagram of a non-uniform pressurizing device according to an embodiment.
FIG. 2 is a schematic diagram of a non-uniform pressurizing member according to an embodiment.
Fig. 3 is a system diagram of a lithium battery performance test system in an embodiment.
Reference numerals 100, mounting parts, 110, first mounting plates, 111, frame bodies, 112, connecting plates, 120, second mounting plates, 130, second guide rods, 140, lock nuts, 201, pressure sensors, 202, amplifying circuits, 203, a/D converters, 204, microprocessors, 205, read only memories, 206, detection devices, 206a, charging and discharging motors, 206b, electrochemical workstations, 207, first interfaces, 208, external devices, 209, second interfaces, 210, LCD display screens, 211, buses, 212, PC ends, 300, first pressurizing mechanisms, 310, fixing plates, 320, first pressurizing plates, 330, first guide rods, 340, pressurizing nuts, 350, first elastic members, 400, second pressurizing mechanisms, 410, screws, 420, second pressurizing plates, 430, connecting blocks, 440, second elastic members.
Detailed Description
In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.
In the description of the present application, it should be understood that, if any, these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used herein with respect to the orientation or positional relationship shown in the drawings, these terms refer to the orientation or positional relationship for convenience of description and simplicity of description only, and do not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.
Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.
In the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, they may be fixedly connected, detachably connected or integrally formed, mechanically connected, electrically connected, directly connected or indirectly connected through an intermediate medium, and communicated between two elements or the interaction relationship between two elements unless clearly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.
Referring to fig. 1 and 2, an uneven pressurizing device according to an embodiment of the present application includes a mounting part 100 and an uneven pressurizing part. The mounting member 100 includes a first mounting plate 110 and a second mounting plate 120 disposed opposite and coupled to each other. The uneven pressurizing component is arranged between the first mounting plate 110 and the second mounting plate 120, the uneven pressurizing component comprises at least two pressurizing mechanisms, one end of each pressurizing mechanism is connected with the first mounting plate 110, the other end of each pressurizing mechanism is provided with a pressurizing plate, the pressurizing plates are arranged at intervals with the second mounting plate 120, 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 batteries.
In this embodiment, by setting at least two pressurizing mechanisms, each pressurizing mechanism is respectively used for applying different pressures to the lithium battery, and each pressurizing mechanism is respectively abutted with different areas of the lithium battery through the pressurizing plate, that is, different pressurizing mechanisms are used for applying different pressures to different areas of the lithium battery, so that uneven pressurizing of the lithium battery is realized. When the square-shell lithium battery is placed on the second mounting plate 120, the test of different areas of the square-shell lithium battery under different pressures can be realized, so that the influence of the pressure non-uniformity on the performance of the square-shell lithium battery can be conveniently studied.
In some embodiments, the at least two pressurizing mechanisms include a first pressurizing mechanism 300 and a second pressurizing mechanism 400, wherein a through hole is formed 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.
In the present embodiment, the pressing plate of the first pressing mechanism 300 is a first pressing plate 320, and the pressing plate of the second pressing mechanism 400 is a second pressing plate 420. Can fix the lithium cell on second mounting panel 120 through first pressurization board 320, first pressurization board 320 can wholly apply first pressure to the lithium cell simultaneously, and second pressurization board 420 passes the through-hole and is used for applying the second pressure to the local region of lithium cell to realize applying different pressures to the different regions of lithium cell, be convenient for research pressure uneven pressure's influence to the lithium cell performance.
In some embodiments, the at least one pressurizing mechanism is a first pressurizing mechanism 300, the first pressurizing mechanism 300 includes a fixing plate 310, a first guide rod 330, a pressurizing nut 340 screwed with the first guide rod 330, and a first elastic member 350 sleeved outside the first guide rod 330, the fixing plate 310 is opposite to the pressurizing plate, the first guide rod 330 sequentially passes through the fixing plate 310 and the pressurizing plate, one end of the first guide rod 330 is connected with the second mounting plate 120, the pressurizing nut 340 is located at one side of the fixing plate 310 away from the pressurizing plate, and two ends of the first elastic member 350 are respectively connected with the fixing plate 310 and the pressurizing plate.
In this embodiment, the pressing plate of the first pressing mechanism 300 is a first pressing plate 320, the first elastic member 350 is disposed between the fixing plate 310 and the first pressing plate 320, the first guide rod 330 sequentially passes through the fixing plate 310, the first elastic member 350 and the first pressing plate 320, two ends of the first elastic member 350 are respectively connected with the fixing plate 310 and the pressing plate, the pressing nut 340 is located at one side of the fixing plate 310 far away from the first elastic member 350, and when the pressing nut 340 is tightened, the pressing nut 340 can sequentially push the first pressing plate 320 to move downward through the fixing plate 310 and the first elastic member 350 until the first pressing plate 320 contacts with the lithium battery. As the pressing nut 340 continues to be tightened, the first elastic member 350 is compressed, thereby pressing the lithium battery through the first pressing plate 320 while fixing the lithium battery to the second mounting plate 120. I.e., by adjusting the compressed length of the first elastic member 350, i.e., controlling the amount of force applied to the lithium battery.
In other embodiments, at least one of the pressurizing mechanisms is a second pressurizing mechanism 400, the second pressurizing mechanism 400 including a screw 410, the screw 410 being threadedly coupled to the first mounting plate 110, the screw 410 being provided with a pressurizing plate at an end remote from the first mounting plate 110.
In the present embodiment, the pressing plate of the second pressing mechanism 400 is a second pressing plate 420. The first mounting plate 110 is provided with a threaded hole, the screw 410 is matched with the threaded hole, and when the screw 410 is rotated, the second pressurizing plate 420 can be driven to move to a side close to the second mounting plate 120 by the screw 410, so that the lithium battery on the second mounting plate 120 is pressurized.
Further, the second pressurizing mechanism further includes a connection block 430 and a second elastic member 440, the connection block 430 is disposed at an end of the screw 410 remote from the first mounting plate 110, and the connection block 430 is connected to the pressurizing plate through the second elastic member 440. Wherein the connection block 430 is made of rubber material for reducing damage to the lithium battery.
Namely, the second elastic member 440 is provided to prevent damage to the lithium battery when the pressurizing mechanism is excessively pressurized. Wherein one end of the screw 410 is fixed with a nut that facilitates rotation of the screw 410. In actual pressurization, the screw 410 moves downwards by rotating the nut on the screw 410, pushing the connecting block 430, the second elastic member 440 and the second pressurizing plate 420 to move downwards, and when the second pressurizing plate 420 contacts the upper part of the square-shell lithium battery, the nut on the screw 410 is continuously rotated, the second elastic member 440 starts to compress, and a different pressure is applied to the set area of the square-shell lithium battery by the second pressurizing plate 420.
Specifically, the second pressurizing plate 420 is provided with a through hole, and the first pressurizing plate 320 penetrates through the through hole to pressurize the lithium battery. The fixing plate 310 is provided with a via hole, the screw 410 of the second pressurizing mechanism 400 passes through the via hole, and the screw 410 is in clearance fit with the via hole, so as to prevent the pressure change of the first pressurizing mechanism 300 from affecting the test result when the rotating screw 410 is pressurized due to the friction force between the screw 410 and the via hole.
In some embodiments, the mounting member 100 includes a second guide bar 130 and a lock nut 140 engaged with the second guide bar 130, the second guide bar 130 passing through the first mounting plate 110 and the second mounting plate 120 in sequence, and the end of the first mounting plate 110 remote from the second mounting plate 120 and the end of the second mounting plate 120 remote from the first mounting plate 110 being provided with the lock nut 140, respectively.
In this embodiment, the adjustment of the relative positions of the first mounting plate 110 and the second mounting plate 120 can be achieved by adjusting the lock nut 140 on the first mounting plate 110 or the lock nut 140 on the second mounting plate 120, so as to be convenient for adapting to lithium batteries with different sizes.
In other embodiments, the first mounting plate 110 includes a frame 111 and a connection plate 112 disposed within the frame 111, one end of the first guide bar 330 is connected to the connection plate 112, the other end is connected to the second mounting plate 120, and the screw 410 is screw-coupled to the connection plate 112.
In the experiment, the mounting member 100 was fixed to a test stand, and specifically, the frame 111 of the mounting member 100 and the second mounting plate 120 were fixed to the test stand, and the lithium battery was mounted on the second mounting plate 120. The connection plate 112 is connected to the first guide bar 330, and the frame 111 is not connected to the connection plate 112, so that the first pressurizing mechanism 300 of a different size can be replaced according to the size of the battery. One end of the first guide rod 330 is connected with the connecting plate 112, and the other end is connected with the second mounting plate 120, namely, the fixing of the connecting plate 112 can be realized through the first guide rod 330, and when the screw 410 is rotated, the screw 410 can drive the second pressurizing plate 420 to be close to the second mounting plate 120, so that the lithium battery on the second mounting plate 120 is pressurized.
In some embodiments, the number of second pressurizing mechanisms 400 is a plurality.
Each second pressurizing mechanism 400 is provided with a second pressurizing plate 420, and a plurality of second pressurizing plates 420 are accommodated in through holes on the first pressurizing mechanism 300 so as to apply different pressures to a plurality of different areas of the battery block at the same time.
In some embodiments, the pressure plate is rugged near the surface of the second mounting plate 120.
In this embodiment, when the pressing plate applies pressure to the lithium battery, the pressing plate of the same pressing mechanism can apply various pressures to the lithium battery respectively due to the uneven surface of the pressing plate, which is close to the second mounting plate 120, so as to facilitate detection of performances of the lithium battery under various non-uniformities.
The non-uniform pressurizing device can be used for applying non-uniform pressure to the square shell type lithium battery. The mounting member 100 is used for fixing the square-case lithium battery on a test experiment table, and at least two non-uniform pressurizing members are disposed in the mounting member 100 for applying different pressurizing to different areas of the square-case lithium battery located on the second mounting plate 120.
Compared with the related art, the invention can apply different pressure values to the partial areas through the second pressurizing mechanism 400 on the basis of uniformly pressurizing the whole of the square-shell lithium battery through the first pressurizing mechanism 300 so as to simulate the pressure non-uniform working condition. The heights of the fixing plate 310 and the pressing plate of the second pressing mechanism 400 can be adjusted to accommodate the measurement of square-case type batteries of different sizes, further improving the versatility of the non-uniform pressing device.
In addition, the battery is pressurized and fixed through the first pressurizing mechanism 300, the through hole is formed in the first pressurizing plate 320 of the first pressurizing mechanism 300, the second pressurizing plate 420 stretches into the through hole to pressurize the lithium battery, the position fixing of the uneven pressure applying area in each experiment is guaranteed, the repeatability is high, and errors caused by position deviation cannot occur.
In some embodiments, referring to fig. 3, an embodiment of the present application further provides a lithium battery performance test system, including:
The non-uniform pressurizing device is used for fixing the lithium battery on the test bed and pressurizing the lithium battery;
a pressure sensor 201 for being disposed on a pressure receiving surface of the lithium battery;
The microprocessor 204 is electrically connected with the pressure sensor 201 and is used for converting data detected by the pressure sensor 201;
the charge-discharge machine 206a is electrically connected with the microprocessor 204 and the lithium battery, and is used for receiving the signal of the microprocessor 204 and circularly charging and discharging the lithium battery according to the signal;
The electrochemical workstation 206b is electrically connected to the microprocessor 204 and the lithium battery, and is used for detecting and recording relevant test data such as current value, capacitance value, voltage value, energy value and the like in the square shell lithium battery in real time.
The specific testing process is that the lithium battery is fixed by an uneven pressurizing device, and after pressurizing, when the pressure sensor 201 displays that the pressure value of each partial area on the lithium battery reaches the set working condition, the microprocessor 204 controls the charge-discharge machine 206a and the electrochemical workstation 206b to be simultaneously started so as to circularly test the square shell type lithium battery.
The performance detection system further includes an amplifying circuit 202, an a/D converter 203, a rom 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 the stress variation in the lithium battery and converts a non-electric pressure signal into a voltage signal, the amplifying circuit 202 is electrically connected with the pressure sensor 201 and amplifies the voltage signal converted by the pressure sensor 201 to enable the analog signal to be suitable for the voltage conversion range of the A/D converter 203, the A/D converter 203 is electrically connected with the amplifying circuit 202 and is used for converting the analog signal into a digital signal, the microprocessor 204 is electrically connected with the A/D converter 203, the microprocessor 204 is used for acquiring the digital signal output by the A/D converter 203 and then analyzing, judging, calculating and the like to obtain a measurement result, the read-only memory 205 is electrically connected with the microprocessor 204 and is used for expanding the storage capacity of the microprocessor 204, the external device 208 is electrically connected with the microprocessor 204 through the first interface 207 and is used for controlling the performance detection system through the external device, the LCD display screen 210 is electrically connected with the microprocessor 204 through the second interface 209 and displays the measurement result of the microprocessor 204, the signal output by the microprocessor 204 is electrically connected with the PC end 212 through the bus 211 after level conversion, and the PC end 212 can carry out subsequent processing on the data and realize the control of the performance detection system.
The charge-discharge machine 206a and the electrochemical workstation 206b are detection devices 206, and when the pressure sensor 201 displays that the pressure value of each partial area on the lithium battery reaches the set working condition, the microprocessor 204 controls the detection devices 206 to be turned on, i.e. the charge-discharge machine 206a and the electrochemical workstation 206b are turned on simultaneously, so as to perform the cycle test on the square-shell lithium battery. The charge-discharge machine 206a is electrically connected with the microprocessor 204 and has a constant-current and constant-voltage charge-discharge function for performing a cyclic test under a set working condition, and the electrochemical workstation 206b is electrically connected with the microprocessor 204 and is used for detecting and recording relevant test data such as a current value, a capacitance value, a voltage value, an energy value and the like in the square shell lithium battery in real time. The PC end 212 performs subsequent analysis processing on the output test data and draws a variation graph. According to the graph, the influence of the non-uniform pressure on the safety and performance of the shell-type lithium battery can be judged.
In addition, according to the test data, the influence on the battery after the parameters such as the replacement of the anode and cathode materials of the battery, the replacement of the diaphragm, the replacement of the electrolyte, the adjustment of the production process and the like can be verified, and on the basis, the influence on the safety and the performance of the shell-type lithium battery by different charging strategies and different circulation systems is verified, so that a reliable experimental basis and a reference basis are provided for the subsequent research, the further development of the battery technology is promoted, and the safety and the performance of the lithium battery are improved.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. An uneven pressurizing device, characterized in that the uneven pressurizing device comprises:
A mounting member (100) including a first mounting plate (110) and a second mounting plate (120) disposed opposite to each other and connected to each other;
The non-uniform pressurizing component is arranged between the first mounting plate (110) and the second mounting plate (120), the non-uniform pressurizing component comprises at least two pressurizing mechanisms, one end of each pressurizing mechanism is connected with the first mounting plate (110), the other end of each pressurizing mechanism is provided with a pressurizing plate, the pressurizing plates are arranged at intervals with the second mounting plate (120) and are used for placing lithium batteries, and each pressurizing mechanism is used for applying different pressures to the lithium batteries.
2. The non-uniform pressurizing device according to claim 1, wherein the at least two pressurizing mechanisms comprise a first pressurizing mechanism (300) and a second pressurizing mechanism (400), a through hole is formed 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, wherein at least one pressurizing mechanism is a first pressurizing mechanism (300), the first pressurizing mechanism (300) comprises a fixed plate (310), a first guide rod (330), a pressurizing nut (340) in threaded connection with the first guide rod (330) and a first elastic piece (350) sleeved outside the first guide rod (330), the fixed plate (310) is arranged opposite to the pressurizing plate, the first guide rod (330) sequentially penetrates through the fixed plate (310) and the pressurizing plate, one end of the first guide rod (330) is connected with the second mounting plate (120), the pressurizing nut (340) is located on one side, far away from the pressurizing plate, of the fixed plate (310), and two ends of the first elastic piece (350) are respectively connected with the fixed plate (310) and the pressurizing plate.
4. A non-uniform pressurizing device according to claim 3, wherein at least one of said pressurizing mechanisms is a second pressurizing mechanism (400), said second pressurizing mechanism (400) comprising a screw (410), said screw (410) being threadedly connected to said first mounting plate (110), said screw (410) being provided with said pressurizing plate at an end remote from said first mounting plate (110).
5. The non-uniform pressurizing device according to claim 4, wherein the first mounting plate (110) includes a frame (111) and a connection plate (112) provided in the frame (111), one end of the first guide bar (330) is connected to the connection plate (112), the other end is connected to the second mounting plate (120), and the screw (410) is screw-connected to the connection plate (112).
6. The non-uniform pressurizing device according to claim 4, wherein the second pressurizing mechanism (400) further comprises a connection block (430) and a second elastic member (440), the connection block (430) is disposed at an end of the screw (410) remote from the first mounting plate (110), and the connection block (430) is connected to the pressurizing plate through the second elastic member (440).
7. The non-uniform pressurizing device according to claim 4, wherein the number of the second pressurizing mechanisms (400) is plural.
8. The non-uniform pressurizing device according to claim 1, wherein the mounting member (100) includes a second guide bar (130) and a lock nut (140) engaged with the second guide bar (130), the second guide bar (130) sequentially passing through the first mounting plate (110) and the second mounting plate (120), and the side of the first mounting plate (110) away from the second mounting plate (120) and the side of the second mounting plate (120) away from the first mounting plate (110) are respectively provided with the lock nut (140).
9. The non-uniform pressure device of claim 1, wherein the pressure plate is rugged near the surface of the second mounting plate (120).
10. A lithium battery performance test system, the lithium battery performance test system comprising:
The non-uniform pressurizing device according to any one of claims 1 to 9, which is used for pressurizing a lithium battery;
A pressure sensor (201) for being arranged on the pressed surface of the lithium battery;
the microprocessor (204) is electrically connected with the pressure sensor (201) and is used for converting data detected by the pressure sensor (201);
The charge-discharge machine (206 a) is electrically connected with the microprocessor (204) and the lithium battery at the same time, and is used for receiving signals of the microprocessor (204) and circularly charging and discharging the lithium battery according to the signals;
And the electrochemical workstation (206 b) is electrically connected with the microprocessor (204) and the lithium battery, and is used for detecting the test data in the lithium battery in real time and transmitting the test data to the microprocessor (204).
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