CN118191625A - Uneven pressurization device for square-shell lithium batteries - Google Patents
Uneven pressurization device for square-shell lithium batteries Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
本申请涉及一种方壳型锂电池的不均匀加压装置，方壳型锂电池的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第一安装板和第二安装板，第二安装板上用于放置锂电池。不均匀加压部件包括移动机构和加压机构，移动机构可移动的设置在第一安装板和第二安装板之间，加压机构设置在移动机构上，移动机构用于带动加压机构在与第二安装板平行的平面内移动，加压机构包括加压板，加压板用于对锂电池的局部位置加压。移动机构带动加压机构在与第二安装板平行的平面内移动，以使得加压机构能够对位于第二安装板上的锂电池的不同位置进行加压，从而实现对锂电池不同位置的不均匀加压。
The present application relates to an uneven pressurizing device for a square-shell lithium battery, which includes a mounting component and an uneven pressurizing component. The mounting component includes a first mounting plate and a second mounting plate that are relatively arranged, and the second mounting plate is used to place the lithium battery. The uneven pressurizing component includes a moving mechanism and a pressurizing mechanism, the moving mechanism is movably arranged between the first mounting plate and the second mounting plate, the pressurizing mechanism is arranged on the moving mechanism, the moving mechanism is used to drive the pressurizing mechanism to move in a plane parallel to the second mounting plate, the pressurizing mechanism includes a pressurizing plate, and the pressurizing plate is used to pressurize a local position of the lithium battery. The moving mechanism drives the pressurizing mechanism to move in a plane parallel to the second mounting plate, so that the pressurizing mechanism can pressurize different positions of the lithium battery located on the second mounting plate, thereby achieving uneven pressurization of different positions of the lithium battery.
Description
Technical Field
The application relates to the technical field of battery quality control and safety, in particular to an uneven pressurizing device of a square shell type lithium battery.
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, the related art can only test the battery with the opposite shell under uniform pressure, and cannot test the battery with the opposite shell under different pressures applied to different positions.
Disclosure of Invention
Based on this, it is necessary to provide a non-uniform pressurizing device for a square-case lithium battery, aiming at the problem that the test under different pressures applied to different positions of the square-case lithium battery cannot be realized in the related art.
A non-uniform pressurizing device of a square-case type lithium battery, the non-uniform pressurizing device of the square-case type lithium battery 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 comprises a moving mechanism and a pressurizing mechanism, wherein the moving mechanism is movably arranged between the first mounting plate and the second mounting plate, the pressurizing mechanism is arranged on the moving mechanism and used for enabling the pressurizing mechanism to move in a plane parallel to the second mounting plate, and the pressurizing mechanism comprises a pressurizing plate which is used for pressurizing the local position of the lithium battery.
In one embodiment, the pressurizing mechanism includes a telescopic assembly for driving the pressurizing plate toward or away from the second mounting plate.
In one embodiment, the pressurizing mechanism includes: the device comprises a first fixing plate, at least one pair of supporting arms and an angle adjusting assembly, wherein each pair of supporting arms comprises a first supporting arm and a second supporting arm, the first supporting arms are connected with the second supporting arms in a rotating mode, one ends of the first supporting arms, which are far away from the second supporting arms, are connected with the first fixing plate in a rotating mode, one ends of the second supporting arms, which are far away from the first supporting arms, are connected with the pressurizing plate in a rotating mode, the first fixing plate is fixedly connected with the moving mechanism, and the angle adjusting assembly is used for adjusting angles between the first supporting arms and the second supporting arms.
In one embodiment, the pressurizing mechanism comprises two pairs of supporting arms, each pair of supporting arms further comprises a sleeve, and the first supporting arm and the second supporting arm are respectively connected with the sleeve in a rotating way;
The angle adjusting assembly comprises a screw, two pairs of sleeves of the supporting arms are respectively in threaded connection with the screw, and the threaded directions of the two sleeves are opposite.
In one embodiment, the pressing mechanism further includes a buffer assembly, and the second support arm is connected to the pressing plate through the buffer assembly.
In one embodiment, the non-uniform pressurizing device of the square-case lithium battery further comprises a fixing member disposed between the first and second mounting plates;
The fixed part comprises a first fixed plate and a second fixed plate which are oppositely arranged, the second fixed plate can be close to or far away from the first fixed plate, the moving mechanism is fixed on the first fixed plate, a through hole is formed in the second fixed plate, and the pressurizing plate can extend into the through hole to pressurize the lithium battery.
In one embodiment, the moving mechanism comprises a first moving component arranged along a first direction and a second moving component arranged along a second direction, the first moving component is fixed on the first fixing plate, the second moving component is arranged on the first moving component, the first moving component is used for driving the second moving component to move along the first direction, the pressurizing mechanism is arranged on the second moving component, the second moving component is used for driving the pressurizing mechanism to move along the second direction, and the first direction and the second direction are arranged in an angle.
In one embodiment, the first moving assembly comprises two oppositely arranged guide rails and first sliding blocks respectively arranged in the guide rails, the second moving assembly comprises a sliding rod and second sliding blocks matched with the sliding rod, two ends of the sliding rod are respectively connected with the first sliding blocks, the guide rails are arranged along a first direction, and the sliding rod is arranged along a second direction.
In one embodiment, the moving mechanism includes a first adsorption head for selectively adsorbing on any position of the first fixing plate.
In one embodiment, the first fixing plate is an iron plate, a cobalt plate or a nickel plate;
the moving mechanism comprises a magnetic attraction block, and the magnetic attraction block is selectively attracted to any position of the first fixed plate.
The uneven pressurizing device of the square shell type lithium battery comprises the moving mechanism and the pressurizing mechanism, wherein the moving mechanism can drive the pressurizing mechanism to move in a plane parallel to the second mounting plate, so that the pressurizing mechanism can pressurize different positions of the lithium battery on the second mounting plate, and uneven pressurizing of different positions of the lithium battery is realized. When the square shell type lithium battery is placed on the second mounting plate, testing under different pressures applied to different positions of the square shell type lithium battery can be achieved.
Drawings
Fig. 1 is a schematic structural diagram of a non-uniform pressurizing device of a square-case lithium battery according to an embodiment.
FIG. 2 is a schematic diagram of a non-uniform pressurizing member according to an embodiment.
Fig. 3 is a schematic view showing a connection structure of the fixing member and the mounting member in one embodiment.
Fig. 4 is a schematic structural diagram of a lithium battery performance test system according to an embodiment.
Reference numerals: 100. a mounting member; 110. a first mounting plate; 120. a second mounting plate; 130. a second guide bar; 140. a lock nut; 201. a pressure sensor; 202. an amplifying circuit; 203. an A/D converter; 204. a microprocessor; 205. a read-only memory; 206. a detection device; 206a, a charging and discharging motor; 206b, an electrochemical workstation; 207. a first interface; 208. an external device; 209. a second interface; 210. an LCD display screen; 211. a bus; 212. a PC end; 300. a fixing member; 310. a first fixing plate; 320. a second fixing plate; 330. a first guide bar; 340. a compression nut; 350. a first elastic member; 400. a moving mechanism; 410. a first moving assembly; 411. a guide rail; 412. a first slider; 420. a second moving assembly; 421. a slide bar; 422. a second slider; 500. a pressurizing mechanism; 510. a first connection plate; 520. a first support arm; 530. a second support arm; 540. a sleeve; 550. an angle adjustment assembly; 551. a screw; 552. a handle; 560. a second connecting plate; 570. a second elastic member; 580. and pressing the plate.
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, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly 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. 1to 3, the uneven pressing device for a square-case lithium battery according to an embodiment of the present application includes a mounting part 100 and an uneven pressing part. The mounting member 100 includes a first mounting plate 110 and a second mounting plate 120 disposed opposite and coupled to each other, and the second mounting plate 120 is used for placing a lithium battery thereon. The non-uniform pressurizing member includes a moving mechanism 400 and a pressurizing mechanism 500, the moving mechanism 400 is movably disposed between the first mounting plate 110 and the second mounting plate 120, the pressurizing mechanism 500 is disposed on the moving mechanism 400, the moving mechanism 400 is used to drive the pressurizing mechanism 500 to move in a plane parallel to the second mounting plate 120, the pressurizing mechanism 500 includes a pressurizing plate 580, and the pressurizing plate 580 is used to pressurize a local position of the lithium battery.
In this embodiment, the non-uniform pressurizing component includes a moving mechanism 400 and a pressurizing mechanism 500, where the moving mechanism 400 can drive the pressurizing mechanism 500 to move in a plane parallel to the second mounting plate 120, so that the pressurizing mechanism 500 can pressurize different positions of the lithium battery located on the second mounting plate 120, thereby implementing non-uniform pressurizing of different positions of the lithium battery. When the square-case type lithium battery is placed on the second mounting plate 120, testing under different pressures applied to different positions of the square-case type lithium battery can be achieved.
In some embodiments, referring to fig. 3, 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 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 are respectively provided with the lock nut 140. By adjusting the lock nut 140 on the first mounting plate 110 or the lock nut 140 on the second mounting plate 120, the relative positions of the first mounting plate 110 and the second mounting plate 120 can be adjusted, thereby being convenient for adapting to lithium batteries with different sizes.
In some embodiments, compression mechanism 500 includes a telescoping assembly for bringing compression plate 580 closer to or farther from second mounting plate 120.
Further, with reference to fig. 2, the pressing mechanism 500 includes: the device comprises a first connecting plate 510, at least one pair of supporting arms and an angle adjusting assembly 550, wherein each pair of supporting arms comprises a first supporting arm 520 and a second supporting arm 530, the first supporting arm 520 and the second supporting arm 530 are rotationally connected, one end of the first supporting arm 520 far away from the second supporting arm 530 is rotationally connected with the first connecting plate 510, one end of the second supporting arm 530 far away from the first supporting arm 520 is rotationally connected with a pressurizing plate 580, the first connecting plate 510 is fixedly connected with the moving mechanism 400, and the angle adjusting assembly 550 is used for adjusting the angle between the first supporting arm 520 and the second supporting arm 530.
In this embodiment, the first support arm 520 and the second support arm 530 are rotatably connected, that is, they can rotate to form any angle, and when the first support arm 520 and the second support arm 530 rotate to the same straight line, the pressure applied to the pressurizing plate 580 is the largest, that is, the pressure to the lithium battery is the largest; when the angle between the first support arm 520 and the second support arm 530 becomes smaller to coincide with each other, the pressure applied to the pressurizing plate 580 is minimized, i.e., the pressure to the lithium battery is minimized. Therefore, when the angle between the first support arm 520 and the second support arm 530 is adjusted by the angle adjusting assembly 550, the pressure applied to the lithium battery by the pressure plate 580 can be changed, thereby achieving the application of uneven pressures at different positions of the lithium battery.
Specifically, the pressing mechanism 500 includes two pairs of support arms, each pair of support arms further including a sleeve 540, and the first support arm 520 and the corresponding second support arm 530 are respectively rotatably connected to the sleeve 540. The angle adjusting assembly 550 comprises a screw 551, the sleeves 540 of the two pairs of support arms are respectively in threaded connection with the screw 551, and the threaded directions of the two sleeves 540 are opposite.
The threads of the two sleeves 540 are in opposite directions, so that when the screw 551 is rotated, the two sleeves 540 move closer to each other. In particular. Taking the example of clockwise rotation of screw 551, where the two sleeves 540 are adjacent to each other, the angle between the two pairs of first and second support arms 520, 530 increases simultaneously, thereby increasing the pressure exerted by pressure plate 580 on the battery. Of course, it is also possible to rotate screw 551 counterclockwise, so that the two sleeves 540 are moved away from each other.
Wherein, one end of the screw 551 is connected with a handle 552 perpendicular to the screw 551 through threads, and when the handle 552 is driven to rotate around the screw 551, the two pairs of the first support arm 520 and the second support arm 530 can be made to approach or separate from each other, thereby adjusting the pressure applied on the battery by the pressure plate 580.
In some embodiments, the compression mechanism 500 further includes a cushioning assembly by which the second support arm 530 is coupled to the compression plate 580.
Specifically, the buffer assembly includes a second connection plate 560 and a second elastic member 570, the second support arm 530 is rotatably coupled to the second connection plate 560, and the second connection plate 560 is coupled to the pressing plate 580 through the second elastic member 570. Namely, by adding the second connection plate 560 and the second elastic member 570, it is used to prevent the lithium battery from being damaged when the pressurizing mechanism 500 is excessively pressurized. The pressure plate 580 may be made of rubber.
In some embodiments, referring to fig. 3, the uneven pressurizing device of the square-case lithium battery further includes a fixing member 300, the fixing member 300 being disposed between the first mounting plate 110 and the second mounting plate 120; the fixing part 300 includes a first fixing plate 310 and a second fixing plate 320 which are oppositely disposed, the second fixing plate 320 can be close to or far away from the first fixing plate 310, the moving mechanism 400 is fixed on the first fixing plate 310, a lithium battery is disposed between the second fixing plate 320 and the second mounting plate 120, a through hole is disposed on the second fixing plate 320, and the pressurizing plate 580 can extend into the through hole to pressurize the lithium battery.
The second fixing plate 320 can be close to or far from the first fixing plate 310, and when the second fixing plate 320 is far from the first fixing plate 310, i.e., the second fixing plate 320 is close to the second mounting plate 120, the lithium battery positioned on the second mounting plate 120 can be pressurized by the second fixing plate 320, thereby fixing the lithium battery. In addition, the second fixing plate 320 can be close to or far from the first fixing plate 310, i.e. adapt to the measurement of lithium batteries with different sizes, so that the universality of the non-uniform pressurizing device of the lithium square shell type lithium battery is further improved.
Specifically, the fixing component 300 includes a first guide rod 330, a compression nut 340 screwed with the first guide rod 330, and a first elastic member 350 sleeved outside the first guide rod 330, where the first guide rod 330 sequentially passes through the first fixing plate 310 and the second fixing plate 320, the compression nut 340 is located at one side of the first fixing plate 310 far away from the second fixing plate 320, and two ends of the first elastic member 350 are respectively connected with the first fixing plate 310 and the second fixing plate 320.
In actual use, when the pressing nut 340 is tightened, the pressing nut 340 can push the second fixing plate 320 to move downward sequentially through the first fixing plate 310 and the first elastic member 350 until the second fixing plate 320 contacts 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 580 while fixing the lithium battery to the second mounting plate 120. By adjusting the compressed length of the first elastic member 350, the amount of force applied to the lithium battery can be controlled.
The battery is pressurized and fixed through the fixing part 300, and the through hole is formed in the second fixing plate 320, the pressurizing plate 580 can extend into the through hole to pressurize the lithium battery, namely, the position fixing of the uneven pressure applying area in each experiment can be ensured, the repeatability is high, and errors caused by position deviation can not be generated.
In some embodiments, the moving mechanism 400 includes a first moving component 410 disposed along a first direction and a second moving component 420 disposed along a second direction, the first moving component 410 is fixed on the first fixing plate 310, the second moving component 420 is disposed on the first moving component 410, the first moving component 410 is used to drive the second moving component 420 to move along the first direction, the pressing mechanism 500 is disposed on the second moving component 420, and the second moving component 420 is used to drive the pressing mechanism 500 to move along the second direction, and the first direction is disposed at an angle with respect to the second direction.
Further, the angle between the first direction and the second direction may be 0 ° -90 °, and in particular, the first direction is perpendicular to the second direction. The first moving component 410 and the second moving component 420 can drive the pressurizing mechanism 500 to move to any position on the lithium battery and located in the through hole, so as to facilitate pressurizing different positions of the lithium battery.
Specifically, the first moving assembly 410 includes two oppositely disposed guide rails 411 and first sliding blocks 412 respectively disposed in the guide rails 411, the second moving assembly 420 includes a sliding rod 421 and second sliding blocks 422 matched with the sliding rod 421, two ends of the sliding rod 421 are respectively connected with the first sliding blocks 412, the guide rails 411 are disposed along a first direction, and the sliding rod 421 is disposed along a second direction.
The first slider 412 is configured to drive the pressing mechanism 500 to move in the first direction when moving in the first direction in the guide 411. The second slider 422 is configured to drive the pressing mechanism 500 to move along the second direction when moving along the second direction on the sliding rod 421. The first moving assembly 410 and the second moving assembly 420 have simple structures, and the adjustment mode is convenient and flexible, so that the experimental test period and the preparation of the experimental mold can be greatly reduced.
In some embodiments, the bottom of the first fixing plate 310 is provided with a coordinate system and a grid pattern. In the case of a plurality of experiments, the same position of the pressure application region of the pressurizing mechanism 500 can be ensured in each experiment, the repeatability is improved, and an error caused by the positional deviation is not generated.
In other embodiments, the moving mechanism 400 includes a first suction head for selectively sucking on any position of the first fixing plate 310.
Further, the first fixing plate 310 is an iron plate, a cobalt plate, or a nickel plate. The moving mechanism 400 includes a magnetic attraction block selectively attracted to any position of the first fixing plate 310.
Of course, the first adsorption head may be adsorbed on the first fixing plate 310 by the negative pressure.
According to the nonuniform pressurizing device for the square shell type lithium battery, on the basis of integrally pressurizing the lithium battery through the fixing part 300, different pressure values are applied to a local area of the lithium battery through the nonuniform pressurizing part, so that a nonuniform pressure working condition can be simulated; by adjusting the position of the opening on the second fixing plate 320 and moving the pressing mechanism 500 by the moving mechanism 400, the effect of applying uneven pressure to different areas of the lithium battery can be achieved.
The heights of the upper plate and the lower plate of the fixing part 300 can be adjusted to adapt to the measurement of square-shell batteries with different sizes, so that the universality of the square-shell lithium battery clamp is further improved; the slide rail type square shell type lithium battery clamp for exerting uneven pressure in a non-fixed point manner adjusts the positions of the holes on the fixed block and the lower plate of the fixed part 300 so as to achieve the effect of exerting uneven pressure on different areas of the square shell type lithium battery.
The lithium battery is fixed by the non-uniform pressurizing device of the square-shell lithium battery, and after pressurization, 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 and discharge machine 206a and the electrochemical workstation 206b to be simultaneously started so as to carry out the cycle test of the square-shell lithium battery.
The performance detection system includes, in conjunction with fig. 4, a pressure sensor 201, an amplifying circuit 202, an a/D converter 203, a microprocessor 204, 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 detection device 206 includes a charge-discharge machine 206a, an electrochemical workstation 206b. The pressure sensor 201 detects the stress change 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, so that the analog signal is suitable for the voltage conversion range of the A/D converter 203; the a/D converter 203 is electrically connected to the amplifying circuit 202, and is configured to convert an analog signal into a digital signal; the microprocessor 204 is electrically connected with the A/D converter 203, and is used for acquiring the digital signals output by the A/D converter 203 and then carrying out analysis, judgment, operation and other processes to obtain measurement results; the rom 205 is electrically connected to the microprocessor 204, and is used for expanding the memory capacity of the microprocessor 204; the external device 208 is electrically connected with the microprocessor 204 through the first interface 207, and controls the performance detection system through the input of the external device; the LCD display 210 is electrically connected to 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 to the PC terminal 212 through the bus 211 after level conversion, and the PC terminal 212 can perform subsequent processing on the data and control the performance detection system.
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 device 206 to be turned on, i.e. the charge-discharge machine 206a and the electrochemical workstation 206b are simultaneously turned on, 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, has a constant-current constant-voltage charge-discharge function, and is used for performing a cycle test of a set working condition; the electrochemical workstation 206b is electrically connected to the microprocessor 204, 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 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, different charging strategies are verified, and different circulation systems influence the safety and performance of the shell-type lithium battery, so that a reliable experimental basis and a reference basis are provided for subsequent researches, the further development of battery technology is facilitated, and the safety and performance of the lithium battery are improved.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above 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 foregoing 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)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410369352.8A CN118191625A (en) | 2024-03-28 | 2024-03-28 | Uneven pressurization device for square-shell lithium batteries |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN118837768A (en) * | 2024-09-05 | 2024-10-25 | 华东理工大学 | Research method and loading device for aging mechanism of lithium ion battery under external load |
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| CN118837768A (en) * | 2024-09-05 | 2024-10-25 | 华东理工大学 | Research method and loading device for aging mechanism of lithium ion battery under external load |
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