Edge voltage testing device and testing system of soft package battery

Abstract

The invention relates to an edge voltage testing device and system for a soft package battery. The device comprises a frame body, a first driving mechanism and a puncturing mechanism, the first driving mechanism is in transmission connection with the frame body and used for driving the frame body to move in the first direction; the puncture mechanism is mounted on the frame body and comprises at least one puncture assembly; the puncturing assembly comprises an installation part and a knife rest capable of moving in the first direction relative to the installation part. The knife rest is provided with a head end and a tail end in the first direction, the head end faces the battery bearing piece, and a puncturing piece and an adjusting mechanism used for adjusting the extending distance of the puncturing piece are installed at the head end. According to the device provided by the invention, the puncture depth of the puncture piece can be accurately controlled, the puncture piece is prevented from puncturing the top sealing edge of the battery, the liquid leakage phenomenon caused by the fact that the top sealing edge of the battery is detected to be broken is further avoided, and the safety performance of the battery can be improved.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a side voltage testing device and a testing system for soft-pack batteries. Background Art

[0002] Soft-pack batteries are the third generation of lithium batteries developed on the basis of the original steel shell, aluminum shell, and plastic shell batteries. They are widely favored by users at home and abroad for their advantages such as lighter, thinner, better safety performance, high appearance requirements, high energy density, stable discharge platform, excellent power performance, and environmental protection and pollution-free. Soft-pack battery products are therefore widely used in electric vehicles, mobile power supplies, digital electronic products, smart wearable products, electric toys, and many other fields.

[0003] Theoretically, the battery of a soft-pack battery is insulated from the aluminum layer of the aluminum-plastic film covering the battery, that is, the voltage difference between the two is zero. However, during the actual processing, the inner polymer layer of the aluminum-plastic film, such as the PP layer, may be partially damaged, resulting in local conduction between the battery and the aluminum layer of the aluminum-plastic film, thereby generating a potential difference. The formation of electron channels and ion channels will cause the lithium ions in the battery to alloy with the aluminum of the aluminum-plastic film to form lithium-aluminum alloy, causing the risk of corrosion of the aluminum-plastic film. Therefore, edge voltage testing is required during the battery production process.

[0004] In the related art, a puncture needle is usually used to pierce the aluminum-plastic packaging film of the battery so that the puncture needle and the aluminum-plastic film are conductive, and a certain voltage or current is applied by a tester to measure the voltage difference between the aluminum-plastic film and the positive or negative electrode. However, the related art has poor accuracy in puncturing the aluminum-plastic film, and it is easy to pierce the top seal, resulting in the risk of leakage, and poor safety. Summary of the invention

[0005] In order to solve or partially solve the problems existing in the related art, the present application provides a side voltage testing device and a testing system for a soft-pack battery. The testing device can accurately control the puncture depth of the puncture member to prevent the puncture member from piercing the top seal of the battery, thereby avoiding leakage of the battery due to the puncture of the top seal, and can improve the safety performance of the battery.

[0006] The first aspect of the present application provides a side voltage test device for a soft-pack battery, comprising:

[0007] A frame and a first driving mechanism, wherein the first driving mechanism is drivingly connected to the frame and is used to drive the frame to move along a first direction;

[0008] A puncture mechanism is mounted on the frame, wherein the puncture mechanism comprises at least one puncture assembly; the puncture assembly comprises a mounting member and a knife holder movable along the first direction relative to the mounting member;

[0009] The knife holder is provided with a head end and a tail end in the first direction, the head end faces the battery carrier, and the head end is equipped with a piercing member and an adjusting mechanism for adjusting the extension distance of the piercing member.

[0010] In one implementation, it further includes a puncture depth control assembly, the puncture depth control assembly including an elastic member disposed between the rear end of the blade holder and the mounting member, a scale fixed relative to the mounting member, an indicator member fixedly connected to the blade holder, a sensor, and a controller, the controller being electrically connected to the sensor, and the indicator member being disposed corresponding to the scale member;

[0011] The sensor is used to sense the displacement information of the indicator along the scale or the deformation information of the elastic member, and send the displacement information or the deformation information to the controller. The controller sends a control signal to the first drive mechanism according to the displacement information or the deformation information to control the operating state of the first drive mechanism.

[0012] In one implementation, the adjustment mechanism includes a puncture limiting portion and a fastener provided on the puncture limiting portion;

[0013] The puncture member includes a main body and a puncture end, the fastener is used to fix the main body to one side of the puncture limiter, and the puncture end extends from the front end of the puncture limiter along the first direction by a preset distance.

[0014] In one implementation, the puncture end extends from the puncture limit portion along the first direction by a preset distance of 0.1 mm to 0.2 mm; and / or,

[0015] The deformation amount of the elastic member along the first direction is 2 mm to 4 mm.

[0016] In one implementation, the method further includes:

[0017] A battery carrier, disposed on one side of the frame;

[0018] The battery carrier is provided with at least one battery fixing portion, and the battery fixing portion is used to limit the battery to a puncture position, and the puncture position is opposite to the blade holder in the first direction.

[0019] In one implementation, the method further includes:

[0020] The battery clamping mechanism is arranged above the battery carrier, and includes a second driving mechanism and a clamping member transmission-connected to the second driving mechanism, wherein the second driving mechanism is used to drive the clamping member to move along a second direction to clamp the battery on the battery carrier.

[0021] In one implementation, the method further includes:

[0022] The third driving mechanism is arranged at the bottom of the battery carrier and is transmission-connected to the battery carrier. The third driving mechanism is used to drive the battery carrier to move upward along the second direction to position the battery carrier at an initial position or a working position. The initial position is far away from the tool holder, and the working position is aligned with the tool holder in the first direction.

[0023] In one implementation, the battery is a soft-pack battery, which includes a battery body and an aluminum-plastic film covering the body, the aluminum-plastic film having a top seal near the battery tab, and when the battery is fixed to the battery carrier, the tab faces the tool holder, and the puncture member corresponds to the top seal in a first direction.

[0024] In one implementation, the puncture mechanism includes a first puncture assembly and a second puncture assembly arranged in parallel, the first puncture assembly and the second puncture assembly correspond to different positions of the top edge seal, and when the puncture members of the first puncture assembly and the second puncture assembly pierce the top edge seal at the corresponding positions, the first puncture assembly, the second puncture assembly and the aluminum-plastic film form an electrically connected test circuit.

[0025] The second aspect of the present application provides a side voltage test system for a soft-pack battery, comprising:

[0026] The test device as described in the first aspect above; and a test machine, the test machine is electrically connected to the puncture member of the puncture mechanism, and is used to detect the side voltage of the battery based on the test loop formed by the puncture member and the aluminum-plastic film.

[0027] The technical solution provided by this application may have the following beneficial effects:

[0028] The battery testing device provided by the present application has a puncture piece and an adjustment mechanism for adjusting the extension distance of the puncture piece installed at the head end of the tool holder. The adjustment mechanism can adjust the extension distance of the puncture piece, thereby accurately controlling the depth of the puncture piece penetrating the top seal of the battery, thereby avoiding puncturing the top seal, thereby avoiding leakage of the battery due to the punctured top seal, and improving the safety performance of the battery; in addition, since the present application can accurately control the depth of the puncture piece penetrating the top seal of the battery, compared with the related art, the size of the puncture hole can be reduced, and the assembly space can be fully utilized, thereby facilitating the improvement of the energy density of the battery.

[0029] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0031] Figure 1 is a side view of a side voltage testing device shown in an embodiment of the present application;

[0032] Figure 2 is a three-dimensional diagram of a side voltage testing device shown in an embodiment of the present application;

[0033] Figure 3 is a structural schematic diagram of a puncture mechanism of a side voltage testing device shown in an embodiment of the present application;

[0034] Figure 4 It is a schematic diagram of the structure of the puncture component of the edge voltage testing device shown in the embodiment of the present application.

[0035] 1. The puncture mechanism is as follows: 100, first driving mechanism; 110, first driving member; 120, guide rail; 200, frame; 210, puncture mechanism; 211, mounting member; 212, knife holder; 2121, puncture limiter; 213, puncture member; 214, adjustment mechanism; 220, second driving mechanism; 221, second driving member; 222, pressing member; 223, connecting plate; 230, third driving mechanism; 231, third driving member; 232, connecting mechanism; 2111, elastic member; 2112, limiter; 2113, indicator; 2114, scale; 300, battery carrier; 310, battery; 311, pole ear; 312, top edge seal. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0037] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0038] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0039] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do 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 should not be understood as a limitation on the present application.

[0040] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral 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. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] In the related art, a puncture needle is used to pierce the aluminum-plastic packaging film of the battery, so that the puncture needle and the aluminum-plastic film are conductive, and a certain voltage or current is applied by a tester to measure the voltage difference between the aluminum-plastic film and the positive or negative electrode. However, the accuracy of the aluminum-plastic film puncture in the related art is poor, and it is easy to puncture the top seal, resulting in the risk of leakage, and the safety is poor. In response to the above problems, the embodiment of the present application provides a side voltage test device and test system for soft-pack batteries. The test device can accurately control the puncture depth of the puncture member to prevent the puncture member from puncturing the top seal of the battery, thereby avoiding the battery from leaking due to the top seal being broken, and can improve the safety performance of the battery.

[0042] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0043] Please also see Figure 1-Figure 4The present application provides a soft-pack battery testing device, which includes a frame 200, a first driving mechanism 100 and a puncture mechanism 210; the first driving mechanism 100 is connected to the frame 200 for driving the frame 200 to move along a first direction X. In this embodiment, the first direction X can be a horizontal direction; the puncture mechanism 210 is installed on the frame 200, and the puncture mechanism 210 includes at least one puncture assembly; the puncture assembly includes a mounting member 211 and a knife holder 212 that can move along the first direction X relative to the mounting member 211; the knife holder 212 is provided with a head end and a tail end in the first direction, the head end faces the battery carrier 300, and the head end is provided with a puncture member 213 and an adjustment mechanism 214 for adjusting the extension distance of the puncture member 213.

[0044] The edge voltage refers to the voltage of the aluminum layer between the positive electrode ear 311 or the negative electrode ear 311 and the aluminum-plastic film. In the soft-pack lithium battery 310, the value of the edge voltage can represent the packaging effect of the aluminum-plastic shell. If there is a problem with the packaging, such as the aluminum-plastic film is damaged or the packaging is not tight, it will cause the battery to swell and leak, seriously affecting the performance and safety of the battery. Therefore, the edge voltage detection is an important means to ensure the quality and safety of the battery. In this application, the edge voltage is detected by piercing the top sealing edge 312 of the aluminum-plastic film through the piercing member 213.

[0045] The battery 310 of the present application is a soft-pack battery, which includes a battery body, a tab 311 extending from the battery body, and an aluminum-plastic film covering the body. The aluminum-plastic film has a top seal 312 near the tab 311. When the battery 310 is in a fixed state to be detected, the tab 311 faces the tool holder 212, and the piercing member 213 corresponds to the top seal 312. The top seal 312 of the aluminum-plastic film refers to the edge portion of the aluminum-plastic film used for top sealing during the packaging process, and its main function is to ensure that the top opening of the battery 310 is tightly closed.

[0046] In the battery testing device provided in the present application, a puncture member 213 and an adjustment mechanism 214 for adjusting the extension distance of the puncture member 213 are installed at the head end of the tool holder 212. The adjustment mechanism 214 can adjust the extension distance of the puncture member 213, thereby accurately controlling the depth of the puncture member 213 penetrating the top sealing edge 312 of the battery 310, thereby avoiding puncturing the top sealing edge 312, thereby avoiding leakage of the battery 310 caused by the top sealing edge 312 being broken, and improving the test accuracy and the safety performance of the battery 310.

[0047] In addition, since the present application can accurately control the depth of the puncture member 213 penetrating the top sealing edge 312 of the battery 310, compared with the related art, the puncture size can be reduced, the assembly space can be fully utilized, and the energy density of the battery 310 can be improved.

[0048] See also Figure 1 and Figure 4The battery testing device of the present application also includes a battery carrier 300, which is arranged on one side of the frame 200. The battery carrier 300 can be a testing platform; the battery carrier 300 is provided with at least one battery fixing portion, which is arranged on the testing platform. The battery fixing portion is used to limit the battery 310 to a puncture position, and the puncture position is opposite to the tool holder 212 in the first direction.

[0049] In some embodiments, the battery fixing portion includes a vacuum adsorption hole provided on the test platform, the vacuum adsorption hole is connected to a vacuum pump, and the vacuum adsorption hole can adsorb the battery 310 on the test platform to keep the battery 310 stable during testing.

[0050] When the battery 310 is tested by the soft-pack battery testing device in this embodiment, the battery 310 is first placed on the test platform for positioning, and the first driving mechanism 100 drives the frame 200 to move toward the test platform in the first direction X to a predetermined position, so that the piercing member 213 can pierce the top sealing edge 312 of the aluminum-plastic film of the battery 310, and the testing system can collect the voltage between the positive or negative electrode of the battery cell and the aluminum-plastic film, thereby realizing the test of the side voltage of the battery 310.

[0051] It should be noted that the battery carrier 300 of the present application may not be limited to a test platform. In other embodiments, the battery carrier 300 may also be a turntable or a linear conveying mechanism capable of carrying the battery 310 .

[0052] See also Figure 4 The adjustment mechanism 214 includes a puncture limiter 2121 and a fastener disposed on the puncture limiter 2121, and the fastener may be a screw or a bolt; the puncture member 213 includes a main body and a puncture end, and the fastener is used to fix the main body of the puncture member 213 to the puncture limiter 2121, and the puncture end of the puncture member 213 extends from the front end of the puncture limiter 2121 to a preset distance along the first direction X. When the puncture member 213 penetrates the top sealing edge 312 of the battery 310 to a preset depth, the puncture limiter 2121 abuts against the battery 310, preventing the blade holder 212 from moving forward further, thereby allowing the puncture member 213 to penetrate to a preset depth.

[0053] In some embodiments, the battery testing device provided in the present application also includes a puncture depth control component, which includes an elastic member 2111 arranged between the tail end of the blade holder 212 and the mounting member 211, a scale 2114 fixed relative to the mounting member 211, an indicator 2113 fixedly connected to the blade holder 212, a sensor, and a controller.

[0054] The controller is electrically connected to the sensor, and the indicator 2113 is set corresponding to the scale 2114; the sensor is used to sense the displacement information of the indicator 2113 along the scale 2114 or the deformation information of the elastic member 2111, and send the displacement information or the deformation information to the controller. The controller sends a control signal to the first drive mechanism 100 according to the displacement information or the deformation information to control the operating state of the first drive mechanism 100.

[0055] In some embodiments, the puncture end of the puncture member 213 extends from the puncture stopper 2121 along the first direction by a distance of 0.1 mm to 0.2 mm, so that the depth of the puncture can be effectively controlled within the range of 0.3 mm, and the puncture depth can be accurately controlled to avoid penetrating the entire membrane layer and causing leakage. In addition, compared with the related art, the puncture size can be reduced, thereby increasing the assembly height space of the battery 310 by 0 to 0.6 mm, making full use of the assembly space of the battery, and facilitating the improvement of the energy density of the battery.

[0056] In some embodiments, the elastic member 2111 is a spring extending along the first direction, and the deformation of the spring is 2 mm to 4 mm. The displacement of the indicator 2113 relative to the scale 2114 can be the same as the deformation of the spring. When the deformation of the spring is 2 mm to 4 mm, the puncture depth of the puncture member 213 can be within 0.1 mm to 0.2 mm, thereby achieving precise control of the puncture depth.

[0057] In the present application, when the puncture depth exceeds a predetermined size, the system can sound an alarm and shut down. For example, when the displacement information of the scale 2114 or the deformation information of the elastic member 2111 exceeds 2 mm to 4 mm, the sensor can sense the distance information and send the distance information to the controller, and the controller sends a stop control signal to the first drive mechanism 100 to control the first drive mechanism 100 to stop running.

[0058] In the present application, the sensor may be a distance sensor, which can sense the displacement information of the indicator 2113 along the scale 2114 or the deformation information of the elastic member 2111. When the tool holder 212 moves along the first direction, since the indicator 2113 is fixed relative to the tool holder 212, the indicator 2113 can point to different scales of the scale 2114 when the tool holder moves with it, so that the moving distance of the tool holder 212 can be observed more intuitively, which is convenient for the staff to adjust the extension distance of the piercing member 213 according to the moving distance of the tool holder 212, and then the depth of the piercing member 213 piercing the top sealing edge 312 of the aluminum-plastic film can be more accurately controlled.

[0059] In this embodiment, during the puncture process, the frame 200 approaches the battery carrier 300 along the first direction, and the puncture end of the puncture member 213 contacts the top sealing edge 312 of the battery 310. Since an elastic member 2111 is provided at the tail end of the knife holder 212, the elastic member 2111 can make the puncture process of the puncture member 213 a flexible puncture, effectively controlling the puncture force and avoiding excessive puncture force from damaging the aluminum-plastic film.

[0060] Continue to see Figure 4 The elastic member 2111 can be a spring extending along the first direction. The mounting member 211 is provided with a mounting groove. The tail end of the blade holder 212 is accommodated in the mounting groove. The two ends of the spring are respectively pressed between the tail end of the blade holder 212 and the groove wall of the mounting groove. When the piercing member 213 pierces, the spring is compressed. When the piercing member 213 is away from the battery 310, the spring is reset.

[0061] In some embodiments, the first driving mechanism 100 drives the frame 200 until the puncture member 213 contacts the top sealing edge 312 of the battery 310 and reaches a predetermined contact pressure, that is, when the displacement information of the scale 2114 or the deformation information of the elastic member 2111 exceeds 2mm to 4mm, the sensor can sense the distance information and send the distance information to the controller, and the controller sends a stop control signal to the first driving mechanism 100 to control the first driving mechanism 100 to stop running. The knife holder 212 continues to move forward a predetermined distance under the elastic force of the elastic member 2111 until the limiter contacts the battery 310, so that the speed and puncture force of the puncture member 213 during the puncture process gradually decrease, and the puncture member 213 stops when it reaches the critical puncture depth of puncturing the aluminum-plastic film. Too light a force may cause the needle to fail to penetrate completely, while too heavy a force or too fast a speed may damage the structure of the aluminum-plastic film. When the piercing member 213 of the present application pierces the top sealing edge 312, the piercing force and speed can be accurately controlled, thereby improving the safety and effectiveness of the piercing process.

[0062] In some embodiments, the puncture member 213 is tilted relative to the second direction Z, so that a preset angle is formed between the puncture end of the puncture member 213 and the top sealing edge 312, and the second direction Z can be a vertical direction, so as to avoid increasing the penetration resistance and damaging the structure of the aluminum-plastic film. In some embodiments, the puncture member 213 can be a blade, which is arranged in the vertical direction, fixed to the blade holder by screws, and has a blade on the side facing the battery, and the blade is closely attached to one side of the puncture limiter and fixed by a fastener, and the blade extends a preset distance relative to the puncture limiter, and the blade is tilted relative to the second direction Z.

[0063] The mounting member 211 of the battery testing device of the present embodiment is further provided with a limit assembly, which includes two limit members 2112 arranged on both sides of the tool holder 212, and the two limit members 2112 contact the two sides of the tool holder 212 in the third direction Y, and accurately limit the movement of the tool holder 212 to the first direction X, so as to avoid the tool holder 212 from being offset in the Y direction during operation, and to avoid piercing the ear glue adjacent to the top sealing edge 312 due to inaccurate puncture position, wherein the first direction X is perpendicular to the third direction Y, and the first direction X, the second direction Z and the third direction Y are respectively along the three coordinate axes of the rectangular coordinate system.

[0064] See also Figure 1 and Figure 2 In some embodiments, in order to improve the position stability of the battery 310 during the detection process, the soft-pack battery detection device of the present application further includes a battery clamping mechanism, which is disposed above the battery carrier 300. The battery clamping mechanism includes a second drive mechanism 220 and at least one clamping member 222 connected to the second drive mechanism 220 by transmission, and at least one clamping member is connected to the output end of the second drive mechanism through a connecting plate 223. The clamping member 222 corresponds to the tab 311 of the battery 310 in the second direction Z. The second drive mechanism 220 is used to drive the clamping member 222 to move along the second direction Z. When the clamping member 222 moves downward, it can clamp the tab 311 of the battery on the battery carrier 300, thereby making the top seal 312 more stable during the process of puncturing the top seal 312 of the aluminum-plastic film, which is conducive to improving the puncture accuracy.

[0065] In some embodiments, when the battery carrier 300 is a detection platform, the soft-pack battery testing device further includes a third driving mechanism 230, which is disposed at the bottom of the battery carrier 300 and is connected to the battery carrier 300 through a connecting mechanism 232. The third driving mechanism 230 is used to drive the battery carrier 300 to move along the second direction Z to position the battery carrier 300 at an initial position or a working position, wherein the initial position is away from the tool holder 212, and the working position is aligned with the tool holder 212 in the first direction. After such arrangement, during the loading stage of the battery 310, the battery 310 and the tool holder 212 are misaligned in the second direction Z to prevent the piercing member 213 from accidentally contacting the battery 310 during the loading process and causing damage to the battery 310.

[0066] Before the test, the frame 200 is located at one end away from the battery carrier 300 in the first direction, and the battery carrier 300 is located in the initial position. At this time, the battery 310 is placed on the detection platform, and then the third driving mechanism 230 is operated to control the detection platform to rise to a position corresponding to the puncture member 213 in the first direction, and then the second driving mechanism 220 is controlled to operate, driving the clamping member 222 to move downward to clamp the battery ear 311 on the detection platform; then the first driving mechanism 100 is controlled to operate, driving the frame 200 to approach the detection platform along the first direction, and the knife holder 212 is pushed forward by the elastic member 2111. When the deformation of the spring exceeds 2mm-4mm, for example 2mm, 2.5mm, 3mm, 3.5mm or 4mm, the system issues an alarm and shuts down, which not only controls the puncture depth within a range of less than 0.3mm, but also has higher test safety.

[0067] In some embodiments, in order to increase the number of tests on the battery 310 per unit time, the puncture mechanism 210 of the soft-pack battery testing device of the present application includes a first puncture assembly and a second puncture assembly arranged in parallel along a third direction Y phase, and the first puncture assembly and the second puncture assembly correspond to different positions of the top sealing edge 312. When the puncture members 213 of the first puncture assembly and the second puncture assembly pierce the top sealing edge 312 at the corresponding position, the first puncture assembly, the second puncture assembly and the aluminum-plastic film form an electrically connected test circuit.

[0068] It should be noted that the present application does not limit the number of the first puncture assembly and the second puncture assembly. In other embodiments, the number of the first puncture assembly and the second puncture assembly can be increased or decreased according to the number of batteries 310 to be tested.

[0069] In the present application, the first driving mechanism 100, the second driving mechanism 220 and the third driving mechanism 230 include driving members for outputting power, wherein the first driving mechanism 100 includes a first driving member 110, the second driving mechanism 220 includes a second driving member 221, and the third driving mechanism 230 includes a third driving member 231, and the driving member may be a cylinder or a motor. The frame 200 may be movably mounted on the guide rail 120, for example, by a slider, and the driving member of the first driving mechanism 100 may be a servo motor, which can drive the frame 200 to move along the guide rail 120 so that the puncture mechanism 210 approaches or moves away from the battery carrier 300 in a first direction, wherein the first direction is the extension direction of the guide rail 120.

[0070] The above introduces the soft-pack battery testing device of the present application. Correspondingly, the present application also provides a soft-pack battery testing system, which includes a soft-pack battery testing device as in any of the above embodiments and a testing machine, the testing machine is electrically connected to the puncture member 213 of the puncture mechanism 210, and is used to detect the edge voltage of the battery 310 based on the test circuit formed by the puncture member 213 and the aluminum-plastic film.

[0071] The test machine includes a data processing module, which processes and analyzes the voltage data of the aluminum-plastic film collected by the puncture piece of the soft-pack battery test device, and finally presents the edge voltage detection results through the display module. Edge voltage detection is used to evaluate the battery's performance indicators such as capacity, internal resistance, and cycle life, and help optimize battery design and production processes. The detection system can detect potential battery problems in a timely manner by detecting the battery's edge voltage, providing operators with timely warnings and decision-making support.

[0072] In the test system provided by the present application, the blade holder 212 of the battery test device is equipped with a puncture piece 213 and an adjustment mechanism 214 for adjusting the extension distance of the puncture piece 213. The adjustment mechanism 214 can adjust the extension distance of the puncture piece 213, thereby accurately controlling the depth of the puncture piece 213 penetrating the top seal 312 of the battery 310, thereby avoiding puncturing the top seal 312, thereby avoiding leakage of the battery 310 due to the puncture of the top seal 312, and improving the safety performance of the battery 310; in addition, since the present application can accurately control the depth of the puncture piece 213 penetrating the top seal 312 of the battery 310, compared with the related art, the puncture size can be reduced, the space can be fully utilized, and the energy density of the battery 310 can be improved, meeting the requirements of small size and high energy density of soft-pack batteries.

[0073] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A side voltage test device for a soft pack battery, characterized in that: include: A frame and a first driving mechanism, wherein the first driving mechanism is drivingly connected to the frame and is used to drive the frame to move along a first direction; A puncture mechanism is mounted on the frame, wherein the puncture mechanism comprises at least one puncture assembly; the puncture assembly comprises a mounting member and a knife holder movable along the first direction relative to the mounting member; The knife holder is provided with a head end and a tail end in the first direction, the head end faces the battery carrier, and the head end is equipped with a piercing member and an adjusting mechanism for adjusting the extension distance of the piercing member.

2. The testing device according to claim 1, characterized in that: The device further comprises a puncture depth control assembly, wherein the puncture depth control assembly comprises an elastic member disposed between the rear end of the blade holder and the mounting member, a scale fixed relative to the mounting member, an indicator member fixedly connected to the blade holder, a sensor, and a controller, wherein the controller is electrically connected to the sensor, and the indicator member is disposed corresponding to the scale member; The sensor is used to sense the displacement information of the indicator along the scale or the deformation information of the elastic member, and send the displacement information or the deformation information to the controller. The controller sends a control signal to the first drive mechanism according to the displacement information or the deformation information to control the operating state of the first drive mechanism.

3. The testing device according to claim 2, characterized in that: The adjustment mechanism includes a puncture limiting portion and a fastener provided on the puncture limiting portion; The puncture member includes a main body and a puncture end, the fastener is used to fix the main body to one side of the puncture limiter, and the puncture end extends from the front end of the puncture limiter along the first direction by a preset distance.

4. The testing device according to claim 3, characterized in that: The puncture end extends from the puncture limit portion along the first direction by a preset distance of 0.1 mm to 0.2 mm; and / or, The deformation amount of the elastic member along the first direction is 2 mm to 4 mm.

5. The testing device according to claim 1, characterized in that: Also includes: A battery carrier, disposed on one side of the frame; The battery carrier is provided with at least one battery fixing portion, and the battery fixing portion is used to limit the battery to a puncture position, and the puncture position is opposite to the blade holder in the first direction.

6. The testing device according to claim 5, characterized in that: Also includes: The battery clamping mechanism is arranged above the battery carrier, and includes a second driving mechanism and a clamping member transmission-connected to the second driving mechanism, wherein the second driving mechanism is used to drive the clamping member to move along a second direction to clamp the battery on the battery carrier.

7. The testing device according to claim 5, characterized in that: Also includes: The third driving mechanism is arranged at the bottom of the battery carrier and is transmission-connected to the battery carrier. The third driving mechanism is used to drive the battery carrier to move along the second direction to position the battery carrier at an initial position or a working position, wherein the initial position is away from the tool holder, and the working position is aligned with the tool holder in the first direction.

8. The testing device according to claim 5, characterized in that: The battery is a soft-pack battery, which includes a battery body and an aluminum-plastic film covering the body, wherein the aluminum-plastic film has a top sealing edge near the battery tab, and when the battery is fixed to the battery carrier, the tab faces the tool holder, and the piercing member corresponds to the top sealing edge in the first direction.

9. The testing device according to claim 8, characterized in that: The puncture mechanism includes a first puncture assembly and a second puncture assembly arranged in parallel, the first puncture assembly and the second puncture assembly correspond to different positions of the top edge seal, and when the puncture members of the first puncture assembly and the second puncture assembly pierce the top edge seal at the corresponding positions, the first puncture assembly, the second puncture assembly and the aluminum-plastic film form an electrically connected test circuit.

10. A side voltage test system for a soft pack battery, characterized in that: include: The testing device according to any one of claims 1 to 9; as well as A testing machine is electrically connected to the puncture member of the puncture mechanism and is used to detect the side voltage of the battery based on a testing loop formed by the puncture member and the aluminum-plastic film.

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