Lithium battery testing device

Abstract

The utility model is applicable to the technical field of lithium battery detection equipment, and particularly relates to a lithium battery testing device, which comprises a bottom tray assembly, the bottom tray assembly comprises a bottom plate, limiting guide rails are arranged on two sides of the surface of the bottom plate, and movable tray assemblies are slidably connected in the limiting guide rails. A fixing assembly is arranged on the surface of the bottom plate. According to the utility model, the over-current copper bar can be accurately aligned with the battery opening pole piece, and each battery pole piece is ensured to be tightly contacted with the corresponding welding bolt. The accurate butt joint design not only improves the reliability of electrical connection, effectively reduces the contact resistance, ensures that stable conductivity can be provided in a high-magnification current test, but also eliminates errors caused by poor contact, and ensures the accuracy of a test result.

Description

Technical Field

[0001] This utility model relates to the technical field of lithium battery testing equipment, specifically a lithium battery testing device. Background Technology

[0002] With the rapid development of lithium battery technology, the performance and application fields of lithium batteries are constantly expanding, and their testing requirements are also increasing. In the testing process of lithium batteries, the accurate acquisition of parameters such as current, voltage, and temperature is crucial for evaluating battery performance. Traditional lithium battery testing equipment typically uses probes or clamps to contact the battery terminals or welded electrodes, relying on linear bearings to guide downward pressure to complete the current connection. However, because the pressure of this contact connection is difficult to control, it often leads to unstable connections, increases the internal resistance between the fixture and the battery, and thus affects the accuracy of the test results. This existing testing method struggles to provide sufficient connection reliability when facing high-rate current and low-temperature environments, failing to meet high-standard testing requirements.

[0003] Furthermore, existing lithium battery testing equipment typically focuses only on current connections, neglecting the synchronous connection of voltage and temperature harnesses. This necessitates manual connection operations by testers, increasing operational complexity and the likelihood of errors. Simultaneously, due to the significant variations in the size and thickness of lithium batteries, existing devices have limited adaptability, failing to accommodate batteries of different specifications and sizes, thus reducing the versatility and efficiency of the testing equipment. For example, patent application CN209070086U discloses a testing device that, while adaptable to different models of square lithium-ion batteries, suffers from increased electrode height as battery thickness increases, making tilting during connection prone to occur and compromising connection stability and safety. Moreover, this device fails to automatically acquire voltage and temperature data, requiring repeated manual connections, further reducing testing efficiency.

[0004] Therefore, existing lithium battery testing equipment has technical limitations when facing the rapidly developing battery industry. First, it cannot provide efficient and stable integrated current, voltage, and temperature connections, affecting the reliability of test results. Second, the equipment lacks versatility and struggles to adapt to batteries of different sizes and thicknesses. Furthermore, manual connection operations are cumbersome and inefficient, failing to meet the high efficiency and automation requirements of modern battery testing. These technical shortcomings urgently need improvement to enhance the connection reliability, ease of operation, and compatibility of lithium battery testing equipment. Utility Model Content

[0005] The purpose of this utility model embodiment is to provide a lithium battery testing device, which aims to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A lithium battery testing device includes a bottom tray assembly, and the bottom tray assembly includes a base plate. Limiting guide rails are provided on both sides of the surface of the base plate, and a movable tray assembly is slidably connected inside the limiting guide rails. A fixing component is provided on the surface of the base plate.

[0008] The fixing component includes a slotted support plate, which is detachably connected to the surface of the base plate. A first top plate is connected to the surface of the slotted support plate, and a voltage probe is provided on the side of the first top plate. A first groove is formed on the surface of the slotted support plate, and a current-carrying copper busbar is slidably connected inside the first groove. A welding bolt is provided on one side of the surface of the current-carrying copper busbar.

[0009] The first top plate has a second groove on its surface near the slotted support plate, and a fixed pressure plate is slidably connected inside the second groove. The surface of the first top plate has a positioning threaded hole, and a positioning screw is engaged inside the positioning threaded hole.

[0010] Furthermore, the surface of the base plate is provided with a first heat dissipation circular hole, and the surface of the base plate is provided with a plurality of base plate openings.

[0011] Furthermore, the mobile pallet assembly includes a pallet base plate, and the pallet base plate is detachably connected to the surface of the base plate. A first limiting block is detachably connected to one side of the surface of the pallet base plate, and a second limiting block is detachably connected to the other side of the surface of the pallet base plate.

[0012] Furthermore, the surface of the tray base plate is provided with several second heat dissipation holes.

[0013] Furthermore, the tray bottom plate and the slotted support plate are respectively equipped with thermocouple plug-in male and thermocouple plug-in female connectors on their adjacent sides.

[0014] Furthermore, a first guide groove is provided inside the first groove, and a first guide slider is installed on the surface of the current busbar. The current busbar is slidably connected inside the first groove through the cooperation of the first guide slider and the first guide groove.

[0015] Furthermore, a second guide groove is provided on the side wall of the second groove, and a second guide slider is provided on the side of the fixed pressure plate. The fixed pressure plate is slidably connected inside the second groove through the cooperation of the second guide slider and the second guide groove.

[0016] Furthermore, a wire harness connection through hole is provided on the side of the current-carrying copper busbar away from the welding bolt.

[0017] Furthermore, the lithium battery testing device also includes an auxiliary tightening assembly, which is used to help define the position of the welding bolts;

[0018] The auxiliary tightening assembly includes a fixing panel, which is disposed on the surface of the slotted support plate. The surface of the fixing panel is provided with a plurality of fixing screws, and one end of the plurality of fixing screws is connected to a second top plate.

[0019] The surface of the second top plate is equipped with a rolling bearing, and a transverse gear rod is rotatably installed inside the rolling bearing. The surface of the fixed panel is provided with a threaded transmission hole. A vertical gear rod is meshed with the outer side of the transverse gear rod, and a transmission thread is provided on one side of the surface of the vertical gear rod. The vertical gear rod is meshed with the inside of the threaded transmission hole through the transmission thread.

[0020] A locking sleeve is provided at one end of the vertical gear rod.

[0021] Furthermore, a tightening nut is installed on the outer side of the transverse gear rod, and the shape inside the locking sleeve is adapted to the shape of the welding bolt.

[0022] The lithium battery testing device provided by this utility model has the following beneficial effects:

[0023] The lithium battery testing device provided by this invention can precisely align the current-carrying copper busbar with the open electrode of the battery, ensuring that each battery electrode is in close contact with its corresponding welding bolt. This precise alignment design not only improves the reliability of the electrical connection and effectively reduces contact resistance, ensuring stable conductivity during high-rate current testing, but also eliminates errors caused by poor contact, guaranteeing the accuracy of the test results.

[0024] Furthermore, the combination of positioning screws and fixing plates in the device securely locks the position of the current-carrying copper busbar, making the entire connection process simple and easy to operate, while avoiding loosening or poor contact caused by improper human operation. The entire adjustment and fixing process requires no complicated tools, greatly improving the ease of use of the device.

[0025] In actual operation, the moving tray assembly can slide smoothly between the limiting guide rails, and the battery can be accurately moved to the test position with a simple push-pull operation, without the need for frequent adjustments, ensuring the efficiency and consistency of the testing process. At the same time, the structural design of the device can adapt to lithium batteries of different thicknesses, sizes and electrode positions, making it more compatible and widely applicable to the testing of various specifications of lithium batteries. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a lithium battery testing device.

[0027] Figure 2 This is a three-dimensional structural diagram of the bottom tray assembly in a lithium battery testing device.

[0028] Figure 3 This is a three-dimensional structural diagram of a movable tray assembly in a lithium battery testing device.

[0029] Figure 4 This is a three-dimensional structural diagram of a fixed component in a lithium battery testing device.

[0030] Figure 5 This is a front cross-sectional view of a fixed component in a lithium battery testing device.

[0031] Figure 6 This is a front view of an auxiliary tightening component in a lithium battery testing device.

[0032] In the diagram: 1. Bottom tray assembly; 101. Base plate; 102. Limiting guide rail; 103. Base plate opening;

[0033] 2. Moving pallet assembly; 201. Pallet base plate; 202. Second limit block; 203. Thermocouple plug-in male connector;

[0034] 3. Fixing components; 301. Slotted support plate; 302. First top plate; 303. Positioning screw; 304. Fixing pressure plate; 305. Current busbar; 306. Voltage probe; 307. Thermocouple plug-in female head; 308. Welding bolt;

[0035] 4. Auxiliary tightening assembly; 401. Tightening nut; 402. Horizontal gear rod; 403. Vertical gear rod; 404. Locking sleeve; 405. Fixing screw; 406. Second top plate; 407. Fixing panel. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0037] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0038] like Figure 1 , Figure 2 and Figure 4As shown in the figure, a lithium battery testing device provided in this embodiment of the present invention includes a bottom tray assembly 1, and the bottom tray assembly 1 includes a bottom plate 101. Limiting guide rails 102 are provided on both sides of the surface of the bottom plate 101, and a movable tray assembly 2 is slidably connected inside the limiting guide rails 102. A fixing assembly 3 is provided on the surface of the bottom plate 101.

[0039] The fixing component 3 includes a slotted support plate 301, which is detachably connected to the surface of the base plate 101. A first top plate 302 is connected to the surface of the slotted support plate 301, and a voltage probe 306 is provided on the side of the first top plate 302.

[0040] The slotted support plate 301 has a first groove on its surface, and a current-carrying copper busbar 305 is slidably connected inside the first groove. Preferably, there are two current-carrying copper busbars 305. A welding bolt 308 is provided on one side of the surface of the current-carrying copper busbar 305. A first guide groove is formed inside the first groove, and a first guide slider is installed on the surface of the current-carrying copper busbar 305. The current-carrying copper busbar 305 is slidably connected inside the first groove through the cooperation of the first guide slider and the first guide groove.

[0041] A second groove is formed on the surface of the first top plate 302 near the slotted support plate 301, and a fixed pressure plate 304 is slidably connected inside the second groove. A second guide groove is formed on the side wall of the second groove, and a second guide slider is provided on the side of the fixed pressure plate 304. The fixed pressure plate 304 is slidably connected inside the second groove through the cooperation of the second guide slider and the second guide groove.

[0042] The surface of the first top plate 302 is provided with a positioning threaded hole, and a positioning screw 303 is engaged inside the positioning threaded hole.

[0043] In one embodiment of this invention, the lithium battery under test is securely placed on the moving tray assembly 2 for testing. After the lithium battery under test is placed, the position of the current-carrying copper busbar 305 needs to be adjusted according to the specific position of the open electrode of the lithium battery to ensure that it is aligned with the open electrode of the battery. During the adjustment process, the horizontal movement of the moving tray assembly 2 and the lithium battery under test should ensure that the welding bolt 308 on the current-carrying copper busbar 305 is in contact with the open electrode of the battery. The specific adjustment process is as follows:

[0044] First, manually slide the current-carrying copper busbar 305 inside the first groove until one end of the current-carrying copper busbar 305 aligns with the battery opening electrode. Then, manually rotate the positioning screw 303, causing it to move downwards inside the positioning threaded hole until one end is firmly pressed against the surface of the fixing plate 304. At this point, the fixing plate 304 also presses the current-carrying copper busbar 305 firmly onto the slotted support plate 301. Through this process, the current-carrying copper busbar 305 is securely positioned, completing its position adjustment.

[0045] Next, the testing of the lithium battery under test will begin. First, manually push the moving tray assembly 2, allowing it to slide along the limiting guide rail 102 on the base plate 101, and gradually approach the fixing assembly 3. During the movement, ensure that the battery opening electrode on the lithium battery is in contact with the welding bolt 308. Then, securely connect the battery opening electrode to the welding bolt 308. After connection, power is applied and the lithium battery testing will begin.

[0046] Through the above technical solution, the lithium battery testing device provided by this utility model can accurately align the overcurrent copper busbar 305 with the open electrode of the battery, ensuring that each battery electrode is in close contact with the corresponding welding bolt 308. This precise docking design not only improves the reliability of the electrical connection and effectively reduces the contact resistance, ensuring stable conductivity in high-rate current testing, but also eliminates errors caused by poor contact, guaranteeing the accuracy of the test results.

[0047] Furthermore, the combination of positioning screws 303 and fixing plates 304 in the device can securely lock the position of the current busbar 305, making the entire connection process simple and easy to operate, while avoiding loosening or poor contact caused by improper human operation. The entire adjustment and fixing process requires no complicated tools, greatly improving the ease of use of the device.

[0048] In actual operation, the moving tray assembly 2 can slide smoothly between the limiting guide rails 102. A simple push-pull operation can accurately move the battery to the test position without frequent adjustments, ensuring the efficiency and consistency of the testing process. Meanwhile, the device's structural design can adapt to lithium batteries of different thicknesses, sizes, and electrode positions, giving it greater compatibility and enabling its widespread application in testing various specifications of lithium batteries.

[0049] The testing device of this invention not only improves the efficiency of testing operations but also enhances testing safety, especially in lithium battery testing under extreme environments such as high current and low temperature, where its stability and reliability are particularly outstanding. This technical solution effectively saves operation time and reduces labor costs, while significantly improving the consistency and accuracy of test results, demonstrating broad application prospects and market value.

[0050] In this embodiment, a first heat dissipation circular hole is formed on the surface of the base plate 101, and a plurality of base plate openings 103 are formed on the surface of the base plate 101. This design brings several advantages. First, these holes can significantly enhance the heat dissipation effect of the device. By increasing air circulation, the heat generated during the test is effectively dissipated, preventing overheating of the battery and device. Especially in high-current tests, maintaining temperature stability is crucial for test safety.

[0051] Secondly, optimized heat dissipation design helps extend the lifespan of the equipment. By avoiding the risk of component aging and failure due to heat buildup, the equipment performs more reliably in long-term use. Furthermore, stable heat dissipation performance maintains temperature uniformity during testing, preventing temperature fluctuations from affecting test results and further improving test accuracy and consistency.

[0052] Finally, the design of the heat dissipation holes also reduces the weight of the base plate while ensuring stable operation of the equipment during long-term testing. This structural optimization results in higher efficiency and safety during use.

[0053] In this embodiment, a wire harness connection through hole is provided on the side of the current busbar 305 away from the welding bolt 308. This design has several advantages. First, the wire harness connection through hole makes the current and voltage connection between the battery and the external detection equipment more convenient and reliable, simplifies the wire harness connection process, and improves the efficiency and convenience of operation.

[0054] Secondly, through-hole design helps to standardize the wiring path of the wire harness, avoid interference or poor contact caused by messy wiring, thereby ensuring the stability and consistency of electrical signal transmission during the test and helping to improve the accuracy of the test results.

[0055] Furthermore, the arrangement of these through-holes enhances the device's compatibility, accommodating wiring harnesses of different sizes and types to meet the needs of various testing equipment, thus increasing its applicability and flexibility. This design allows the testing device to more efficiently perform current and voltage testing connections for lithium batteries, further improving testing efficiency and reliability.

[0056] like Figure 1 and Figure 3 As shown, in one embodiment of this utility model, the movable tray assembly 2 includes a tray base plate 201, which is detachably connected to the surface of the base plate 101, facilitating installation and disassembly in different testing scenarios. A first limiting block is detachably connected to one side of the surface of the tray base plate 201 to fix and limit one side of the lithium battery, ensuring that the battery does not slide or shift during testing; a second limiting block 202 is detachably connected to the other side of the surface of the tray base plate 201 to securely position the other side of the battery.

[0057] In this embodiment, the detachable design of the first and second limiting blocks 202 allows the movable tray assembly 2 to adapt to lithium batteries of different sizes and shapes. By adjusting the position of the limiting blocks, the testing device can flexibly fix batteries of various specifications, enhancing its compatibility. Furthermore, a groove is provided on the side of the limiting block near the battery for arranging thermocouple data acquisition harnesses, enabling real-time monitoring of battery temperature and further improving the accuracy and safety of the test.

[0058] This design ensures the stability of the battery during testing, reduces testing errors caused by battery movement or poor contact, and improves the flexibility and convenience of testing operations, making it suitable for a wide range of battery testing scenarios.

[0059] In this embodiment, the surface of the tray base plate 201 is provided with a plurality of second heat dissipation holes, and the specifications of the second heat dissipation holes are the same as those of the first heat dissipation holes. This design has multiple advantages.

[0060] First, the second heat dissipation hole has the same specifications as the first heat dissipation hole, which ensures that the heat dissipation capacity of the entire device is balanced and uniform at different levels. This helps to dissipate the heat generated during the test more efficiently, prevent local overheating, and ensure the safe operation of the test device and lithium battery.

[0061] Secondly, the standardized design of the heat dissipation holes makes the overall heat dissipation structure more standardized, which not only improves the air circulation effect but also enhances the heat dissipation efficiency. Especially during high current or long-term testing, it can maintain the temperature stability of the equipment and prevent heat accumulation from affecting battery performance.

[0062] Finally, the ventilation holes on the tray base plate 201 help reduce the overall weight of the tray, making it lighter and easier to handle, reducing the structural burden during testing, and improving the operational flexibility and durability of the device. At the same time, the uniform layout of the ventilation holes further enhances the heat dissipation performance of the testing device, extending its service life.

[0063] This design optimizes the lithium battery testing device in terms of heat dissipation and operational performance, enabling it to perform various lithium battery testing operations more safely and efficiently.

[0064] In this embodiment, thermocouple plug-in male head 203 and thermocouple plug-in female head 307 are respectively installed on the sides of the tray bottom plate 201 and the slotted support plate 301 that are close to each other. This design has many advantages.

[0065] First, the design of the male connector 203 and female connector 307 on the thermocouple connector makes connecting and disconnecting the thermocouple harness simpler and faster. The automatic docking method avoids tedious manual wiring steps, significantly improving the connection efficiency of battery temperature monitoring and reducing the possibility of human wiring errors.

[0066] Secondly, this plug-in design helps ensure the reliability and stability of temperature acquisition during each test. The precise alignment of the plug-in components allows the thermocouple to acquire battery temperature data in a timely and accurate manner during the test, avoiding data transmission interruptions or errors caused by poor contact, thereby improving the accuracy of the test results.

[0067] Furthermore, the modular design of the plug-in components facilitates the maintenance and replacement of the testing device. When it is necessary to replace the thermocouple or related components, it is not necessary to disassemble the entire device; only the plug-in components need to be replaced, which greatly reduces maintenance difficulty and time costs.

[0068] Overall, this design effectively improves the ease of operation, reliability, and maintenance efficiency of the testing device, ensures the accuracy of battery temperature data acquisition, and thus optimizes the efficiency and safety of the entire lithium battery testing process.

[0069] like Figure 5 and Figure 6 As shown, in one embodiment of the present invention, the lithium battery testing device further includes an auxiliary tightening component 4, which is used to help limit the position of the welding bolt 308.

[0070] The auxiliary tightening assembly 4 includes a fixing panel 407, which is disposed on the surface of the slotted support plate 301. The surface of the fixing panel 407 is provided with a plurality of fixing screws 405, and one end of the plurality of fixing screws 405 is connected to the second top plate 406.

[0071] A rolling bearing is mounted on the surface of the second top plate 406, and a transverse gear rod 402 is rotatably mounted inside the rolling bearing. A threaded transmission hole is opened on the surface of the fixed panel 407. A vertical gear rod 403 is meshed with the outer side of the transverse gear rod 402. The number of vertical gear rods 403 is the same as the number of welding bolts 308. A transmission thread is opened on one side of the surface of the vertical gear rod 403, and the vertical gear rod 403 is meshed with the inside of the threaded transmission hole through the transmission thread.

[0072] A locking sleeve 404 is provided at one end of the vertical gear rod 403.

[0073] A tightening nut 401 is installed on the outside of the transverse gear rod 402, and the shape inside the locking sleeve 404 is adapted to the shape of the welding bolt 308.

[0074] In this embodiment, after the welding bolt 308 contacts the open electrode of the lithium battery under test, to ensure the stability of the connection between the two, the operator can manually rotate and tighten the nut 401, causing the transverse gear rod 402 to rotate via the rolling bearing. As the transverse gear rod 402 rotates, the two vertical gear rods 403 rotate synchronously and gradually move downwards through their internal transmission threads. Finally, the vertical gear rods 403 will securely fit around the welding bolt 308, ensuring tight contact between the welding bolt 308 and the open electrode of the battery, thus completing a stable limiting and fixing.

[0075] Through the above technical solution, the auxiliary tightening component 4 in the lithium battery testing device can effectively ensure the connection stability between the welding bolt 308 and the open electrode of the lithium battery under test. By rotating the tightening nut 401, the transverse gear rod 402 drives the vertical gear rod 403 to rotate through the rolling bearing. At the same time, the vertical gear rod 403 gradually moves downward under the action of the threaded drive hole until the locking sleeve 404 tightly fits the welding bolt 308. This process ensures a tight connection between the welding bolt 308 and the open electrode of the battery, thereby providing a solid current conduction path and avoiding poor contact or current interruption caused by loosening.

[0076] The advantage of this solution lies in the gear-driven design of the auxiliary tightening component 4, which allows operators to tighten multiple bolts simultaneously through simple manual operation. The rotation of the transverse gear rod 402 causes multiple vertical gear rods 403 to press down synchronously, ensuring that each welded bolt 308 is evenly and stably fixed in place. This not only improves operational efficiency but also ensures that multiple welded bolts 308 are tightened under the same force, thereby enhancing the reliability and consistency of the entire test connection.

[0077] Furthermore, the shape of the locking sleeve 404 matches the shape of the welding bolt 308, ensuring precise alignment between the sleeve and the bolt and preventing loosening or deviation due to shape mismatch. Simultaneously, the use of rolling bearings makes operation smoother and more efficient, reducing frictional resistance during tightening, lowering operator workload, and further enhancing operational convenience and reliability.

[0078] Through this design, the lithium battery testing device can simplify the operation process and improve the efficiency of operation while ensuring a stable connection between the welding bolt 308 and the open electrode of the battery. This makes the entire testing system more efficient, safe and stable, and suitable for testing various types of lithium batteries. It has broad application prospects and industrial value.

[0079] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lithium battery testing device, comprising a bottom tray assembly, wherein the bottom tray assembly includes a base plate, characterized in that, Both sides of the base plate surface are provided with limit guide rails, and the inside of the limit guide rails is slidably connected with a movable tray assembly. The surface of the base plate is provided with a fixing assembly. The fixing component includes a slotted support plate, which is detachably connected to the surface of the base plate. A first top plate is connected to the surface of the slotted support plate, and a voltage probe is provided on the side of the first top plate. A first groove is formed on the surface of the slotted support plate, and a current-carrying copper busbar is slidably connected inside the first groove. A welding bolt is provided on one side of the surface of the current-carrying copper busbar. The first top plate has a second groove on its surface near the slotted support plate, and a fixed pressure plate is slidably connected inside the second groove. The surface of the first top plate has a positioning threaded hole, and a positioning screw is engaged inside the positioning threaded hole.

2. The lithium battery testing device according to claim 1, characterized in that, The surface of the base plate is provided with a first heat dissipation circular hole, and the surface of the base plate is provided with a plurality of base plate openings.

3. The lithium battery testing device according to claim 1, characterized in that, The mobile pallet assembly includes a pallet base plate, and the pallet base plate is detachably connected to the surface of the base plate. A first limiting block is detachably connected to one side of the surface of the pallet base plate, and a second limiting block is detachably connected to the other side of the surface of the pallet base plate.

4. The lithium battery testing device according to claim 3, characterized in that, The surface of the tray bottom plate is provided with several second heat dissipation holes.

5. A lithium battery testing device according to claim 3, characterized in that, Thermocouple male connectors and thermocouple female connectors are respectively installed on the sides of the tray bottom plate and the slotted support plate that are close to each other.

6. A lithium battery testing device according to claim 1, characterized in that, The first groove has a first guide groove inside, and the surface of the current busbar is equipped with a first guide slider. The current busbar is slidably connected inside the first groove through the cooperation of the first guide slider and the first guide groove.

7. A lithium battery testing device according to claim 1, characterized in that, The second groove has a second guide groove on its side wall, and the fixed pressure plate has a second guide slider on its side. The fixed pressure plate is slidably connected to the inside of the second groove through the cooperation of the second guide slider and the second guide groove.

8. A lithium battery testing device according to claim 1, characterized in that, A wire harness connection through hole is provided on the side of the current-carrying copper busbar away from the welding bolt.

9. A lithium battery testing device according to claim 1, characterized in that, The lithium battery testing device also includes an auxiliary tightening component, which is used to help limit the position of the welding bolts; The auxiliary tightening assembly includes a fixing panel, which is disposed on the surface of the slotted support plate. The surface of the fixing panel is provided with a plurality of fixing screws, and one end of the plurality of fixing screws is connected to a second top plate. The surface of the second top plate is equipped with a rolling bearing, and a transverse gear rod is rotatably installed inside the rolling bearing. The surface of the fixed panel is provided with a threaded transmission hole. A vertical gear rod is meshed with the outer side of the transverse gear rod, and a transmission thread is provided on one side of the surface of the vertical gear rod. The vertical gear rod is meshed with the inside of the threaded transmission hole through the transmission thread. A locking sleeve is provided at one end of the vertical gear rod.

10. A lithium battery testing device according to claim 9, characterized in that, A tightening nut is installed on the outside of the transverse gear rod, and the shape inside the locking sleeve is adapted to the shape of the welding bolt.

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