Prismatic lithium battery liquid cooling test device

Abstract

The present invention provides a square lithium battery liquid cooling test device, which is used in high-performance battery test module equipment, including a bottom plate, a test cold water device, a liquid cooling test fixture, and a square lithium battery test fixture. The present invention has the beneficial effects that: the cold water connection heads on the first test cold water plate and the second test cold water plate are connected with the test cold water connection head through a cold water pipe, which plays a cooling role, and simulates the low temperature function of a high and low temperature box to provide a low temperature test environment for the battery. Compared with traditional temperature boxes, the energy consumption is lower and the temperature reduction is more direct. The first test cold water plate and the second test cold water plate are provided with a heating plate and a temperature probe, which plays a heating role, and simulates the high temperature function of the high and low temperature box to provide a high temperature test environment for the battery. Compared with traditional temperature boxes, the energy consumption is lower, the temperature increase is more direct, the temperature fluctuation is small, and a more accurate battery test environment is provided.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery testing devices, and in particular to a square lithium battery liquid cooling testing device used in a high-performance battery testing module device. Background Art

[0002] With the continuous maturity and improvement of the formation process, the battery requires not only high-precision charging and discharging equipment for high-precision charging and discharging during formation, but also requires the activity of lithium ions to be guaranteed under high temperature environment, and the deformation of the battery to be minimized during the charging and discharging process under high pressure. All batteries require high-precision charging and discharging equipment and pressure required by the process and high ambient temperature during formation. In the existing battery manufacturing, due to different needs, the types and specifications of batteries are diverse, and the sizes of batteries of different specifications and types are also different. There is a large difference in the distance between the positive and negative ears of the battery, which leads to the need for corresponding battery test fixtures of different types when testing different types of batteries. For battery production and design manufacturers, ordinary battery test fixtures cannot meet the testing requirements of different types of batteries. There is currently no water circulation test fixture of this structure on the market. During use, the clamping force at each position on the surface of the battery cell is difficult to grasp, which is not enough to achieve the purpose of force balance. The clamping force on the surface of the battery cell is different, which is likely to affect the state of the internal electrode of the battery. In the process of charging and discharging the battery with large current, it cannot meet all the requirements of battery hot pressing formation.

[0003] The main source of power for new energy vehicles is lithium batteries. In order to obtain sufficient energy, lithium batteries are usually used in the form of battery packs connected in series and parallel. During the use of the vehicle, the battery pack will complete the charging and discharging process under different circumstances. During charging and discharging, the battery pack will undergo various chemical reactions and generate a large amount of heat, which will cause the battery pack to have the risk of spontaneous combustion and explosion. In order to reduce the risk, the battery pack needs to be cooled. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned technical problems and to provide a new type of square lithium battery liquid cooling test device used in high-performance battery testing module equipment. The cold water connections on the first test cold water plate and the second test cold water plate are connected to the test cold water connection head through cold water pipes, which play a cooling role, simulating the low temperature function of the high and low temperature box to provide a low temperature testing environment for the battery. Compared with traditional temperature boxes, it has lower energy consumption and more direct cooling. The first test cold water plate and the second test cold water plate are provided with a heating plate and a temperature probe, which play a heating role, simulating the high temperature function of the high and low temperature box to provide a high temperature testing environment for the battery. Compared with traditional temperature boxes, it has lower energy consumption, more direct heating, small temperature fluctuation, and provides a more accurate battery testing environment.

[0005] The present invention is achieved through the following technical solutions:

[0006] A square lithium battery liquid cooling test device is used in a high-performance square lithium battery test module device, comprising a base plate, a test cold water device, a liquid cooling test fixture, and a square lithium battery test fixture. The test cold water device is provided on the left side of the base plate, and the liquid cooling test fixture is provided on the right side of the test cold water device. A square lithium battery test fixture is provided between two of the liquid cooling test fixtures. The two liquid cooling test fixtures move the square lithium battery under the test probes on the square lithium battery test fixtures, and tighten the square lithium battery, and then drive the probe quick handle, and the driving probe quick handle drives the test probe to align with the pole ear on the square lithium battery for testing.

[0007] As a further step, the test cold water device includes a test cold water fixing plate, a test cold water support plate, a test cold water test joint, a test cold water water head, a test cold water external threaded joint, a test cold water fixing block, and a test cold water outer cover. The test cold water support plate is installed on the upper left side of the bottom plate. A test cold water fixing plate is provided between the two test cold water support plates. A cold water head groove is provided at the lower part of the test cold water fixing plate. The test cold water head is embedded in the cold water head groove. A plurality of Test joint holes of different sizes, the test cold water test joints are embedded in test joint holes of different sizes on the upper part of the test cold water fixing plate, the test cold water fixing block is fixed on the upper left side of the base plate by a nut, a round hole is provided in the middle of the test cold water fixing block, one end of the test cold water connecting head passes through the round hole in the middle of the test cold water fixing block and is connected to the test cold water external threaded joint, the test cold water outer cover seamlessly connects the test cold water connecting head, the test cold water external threaded joint and the test cold water fixing block on the upper left side of the base plate.

[0008] As a further step, the liquid-cooled test fixture includes a first liquid-cooled guide rail, a first liquid-cooled slider, a second liquid-cooled slider, a first liquid-cooled support plate, a first liquid-cooled fixed block, a first test cold water plate, a second liquid-cooled guide rail, a third liquid-cooled slider, a fourth liquid-cooled slider, a second liquid-cooled support plate, a second liquid-cooled fixed block, and a second test cold water plate. The first liquid-cooled guide rail and the second liquid-cooled guide rail are respectively installed on the right side of the base plate, and the first liquid-cooled guide rail is provided with a first liquid-cooled slider and a second liquid-cooled slider at both ends, and the second liquid-cooled guide rail is provided with a third liquid-cooled slider and a fourth liquid-cooled slider at both ends. The first liquid-cooled support plate is provided with a third liquid-cooled slider and a fourth liquid-cooled slider at both ends. The two ends of the plate are respectively installed on the first liquid-cooled slider and the third liquid-cooled slider, a first liquid-cooled fixing block is provided on the upper part of the first liquid-cooled support plate, a first test cold water plate is provided on the first liquid-cooled fixing block, the two ends of the second liquid-cooled support plate are respectively installed on the second liquid-cooled slider and the fourth liquid-cooled slider, a second liquid-cooled fixing block is provided on the upper part of the second liquid-cooled support plate, a second test cold water plate is provided on the second liquid-cooled fixing block, cold water connections are respectively provided at the symmetrical angles of the first test cold water plate and the second test cold water plate, and the cold water connections are connected with the test cold water connections through a cold water pipe.

[0009] As a further feature, a heating plate is provided on the inner side of the first test cold water plate and the second test cold water plate, and the heating plate is electrically connected to the test cold water test connector via a wire, and a plurality of temperature probes are provided on the outer side of the first test cold water plate and the second test cold water plate.

[0010] Furthermore, the square lithium battery test fixture includes a test fixture base plate, a test fixture support plate, and a test fixture probe device. A card slot is provided at the bottom of the test fixture base plate, and the card slot at the bottom of the test fixture base plate is respectively installed on the first liquid cooling rail and the second liquid cooling rail. Test fixture support plates are provided at both ends of the test fixture base plate. A square lithium battery is provided on the test fixture base plate. A test fixture probe device is provided between the tops of the two test fixture support plates. A square lithium battery is provided under the test fixture probe device. The test probes on the test fixture probe device are aligned with the positive and negative ears on the square lithium battery for testing.

[0011] As a further step, the test fixture probe device includes a probe fixing plate, a probe connecting rod, a probe linear axis, a first probe guide rod, a second probe guide rod, a probe quick handle, a probe mounting plate, and a test probe. The probe fixing plate is installed on the top of the test fixture support plate, and guide holes are provided at both ends of the probe fixing plate. One end of the first probe guide rod passes through the guide hole at one end of the probe fixing plate and is connected to one end of the probe mounting plate, and is locked on the probe fixing plate through the probe linear axis. One end of the second probe guide rod passes through the guide hole at the other end of the probe fixing plate and is connected to the other end of the probe mounting plate, and is locked on the probe fixing plate through the probe linear axis. One end of the probe connecting rod is installed in the middle of the probe mounting plate, and the other end of the probe connecting rod passes through the circular hole in the middle of the probe fixing plate and is connected to the probe quick handle. Grooves are provided at both ends of the probe mounting plate. The test probe is installed in the grooves at both ends of the probe mounting plate, and the test probe can move left and right in the groove. The test probe is aligned with the positive and negative ears on the square lithium battery for testing.

[0012] As a further feature, a wiring board is provided on the upper portion of the test fixture support plate.

[0013] As a further feature, a limit block is provided on the inner side wall of the test fixture support plate, and the limit block can place the square lithium battery on the bottom plate of the test fixture to prevent the square lithium battery from loosening during testing.

[0014] Furthermore, a groove is provided on the top of the test fixture support plate, and a locking component is provided in the groove. The locking component locks one end of the probe fixing plate on the top of the test fixture support plate. The locking component includes a locking handle, a locking connecting rod, and a locking nut. A locking nut is provided in the groove on the top of the test fixture support plate, one end of the locking connecting rod passes through one end of the probe fixing plate and is connected to the locking nut, and the locking connecting rod is fixed to the top of the test fixture support plate, and the other end of the locking connecting rod is connected to the locking handle.

[0015] As a further feature, baffles are provided on both sides of the bottom plate.

[0016] The beneficial effects of the present invention are:

[0017] (1) The cold water heads on the first test cold water plate and the second test cold water plate are connected to the test cold water head through cold water pipes, which play a cooling role and simulate the low temperature function of the high and low temperature box to provide a low temperature test environment for the battery. Compared with traditional temperature boxes, it has lower energy consumption, more direct cooling, and provides a more accurate battery test environment;

[0018] (2) The first test cold water plate and the second test cold water plate are equipped with a heating plate and a temperature probe to increase the temperature, simulating the high temperature function of the high and low temperature box to provide a high temperature test environment for the battery. Compared with the traditional temperature box, it has lower energy consumption, more direct temperature increase, and small temperature fluctuation, providing a more accurate battery test environment;

[0019] (3) The probes on the square lithium battery test fixture are aligned with the positive and negative tabs of the square lithium battery for testing, and square lithium batteries of different specifications and with different positions of the positive and negative tabs can be tested, which can effectively avoid the test results being affected by the poor fit between the detection circuit and the positive and negative tabs during the test. The fixture is user-friendly, has a simple structure, is easy to use, and has low cost. Compared with the traditional square lithium battery test fixture that uses screws to fix the connecting wires, the fixture in the present invention is simple to operate, has high efficiency, good high current stability, and is easy to realize automated assembly.

[0020] (4) A wiring board is provided on the upper part of the test fixture support plate, which solves the advantages of convenient wiring and convenient assembly;

[0021] (5) The square lithium battery liquid cooling test fixture is modular and compatible with a wider range of lithium batteries of different shapes, making it easier to implement highly automated solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of a square lithium battery liquid cooling test device of the present invention;

[0023] Figure 2 This is a schematic diagram of the explosion structure of the square lithium battery liquid cooling test device of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the cold water testing device of the present invention;

[0025] Figure 4 This is a schematic diagram of the explosion structure of the cold water testing device of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the liquid cooling test fixture of the present invention;

[0027] Figure 6 This is a schematic diagram of the explosion structure of the liquid cooling test fixture of the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of the square lithium battery test fixture of the present invention;

[0029] Figure 8 This is a schematic diagram of the explosion structure of the square lithium battery test fixture of the present invention;

[0030] Fig. 9 This is a schematic diagram of the structure of the test fixture probe device of the present invention;

[0031] Fig.10 This is a schematic diagram of the explosion structure of the test fixture probe device of the present invention;

[0032] Fig.11 It is a schematic diagram of the structure of the locking component of the present invention;

[0033] Fig.12 This is a schematic diagram of the explosion structure of the locking component of the present invention;

[0034] Figure numerals: 1, bottom plate; 101, baffle; 2, test cold water device; 201, test cold water fixing plate; 202, test cold water support plate; 203, test cold water test joint; 204, test cold water water head; 205, test cold water external thread joint; 206, test cold water fixing block; 207, test cold water outer cover; 3, liquid cooling test fixture; 301, first liquid cooling rail; 302, first liquid cooling slider; 303, second liquid cooling slider; 304, first liquid cooling support plate; 305, first liquid cooling fixing block; 306, first test cold water plate; 307, second liquid cooling rail; 308, third liquid cooling slider; 309, fourth liquid cooling slider; 310, second liquid cooling support plate; 3 11. Second liquid cooling fixing block; 312. Second test cold water plate; 313. Heating plate; 314. Temperature probe; 4. Square lithium battery test fixture; 41. Test fixture bottom plate; 410. Groove; 42. Test fixture support plate; 420. Wiring board; 421. Limit block; 43. Test fixture probe device; 431. Probe fixing plate; 432. Probe connecting rod; 433. Probe linear axis; 434. First probe guide rod; 435. Second probe guide rod; 436. Probe quick handle; 437. Probe mounting plate; 438. Test probe; 44. Locking component; 440. Locking handle; 441. Locking connecting rod; 442. Locking nut; 5. Square lithium battery. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0037] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] Refer to Figure 1-12 As shown, a square lithium battery liquid cooling test device is used in a high-performance square lithium battery test module device, including a base plate 1, a test cold water device 2, a liquid cooling test fixture 3, and a square lithium battery test fixture 4. The test cold water device 2 is provided on the left side of the base plate 1, and the liquid cooling test fixture 3 is provided on the right side of the test cold water device 2. A square lithium battery test fixture 4 is provided between the two liquid cooling test fixtures 3. The two liquid cooling test fixtures 3 move the square lithium battery 5 to under the test probe 438 on the square lithium battery test fixture 4, and tighten the square lithium battery 5, and then drive the probe quick handle 436, and the driving probe quick handle 436 drives the test probe 438 to align with the pole ear on the square lithium battery 5 for testing.

[0039] Preferably, the test cold water device 2 includes a test cold water fixing plate 201, a test cold water support plate 202, a test cold water test joint 203, a test cold water water head 204, a test cold water external threaded joint 205, a test cold water fixing block 206, and a test cold water outer cover 207. The test cold water support plate 202 is installed on the upper left side of the base plate 1, and a test cold water fixing plate 206 is provided between the two test cold water support plates 202. A cold water head groove is provided at the lower part of the test cold water fixing plate 206, and the test cold water head 204 is embedded in the cold water head groove. The test cold water fixing plate 206 is provided at the upper part There are several test joint holes of different sizes, the test cold water test joint 203 is embedded in the test joint holes of different sizes on the upper part of the test cold water fixing plate 206, the test cold water fixing block 206 is fixed on the upper left side of the base plate 1 by a nut, a round hole is provided in the middle of the test cold water fixing block 206, one end of the test cold water connecting head 204 passes through the round hole in the middle of the test cold water fixing block 206 and is connected to the test cold water external threaded joint 205, and the test cold water outer cover 207 seamlessly connects the test cold water connecting head 204, the test cold water external threaded joint 205, and the test cold water fixing block 206 on the upper left side of the base plate 1.

[0040] Preferably, the liquid-cooled test fixture 3 includes a first liquid-cooled guide rail 301, a first liquid-cooled slider 302, a second liquid-cooled slider 303, a first liquid-cooled support plate 304, a first liquid-cooled fixed block 305, a first test cold water plate 306, a second liquid-cooled guide rail 307, a third liquid-cooled slider 308, a fourth liquid-cooled slider 309, a second liquid-cooled support plate 310, a second liquid-cooled fixed block 311, and a second test cold water plate 312. The first liquid-cooled guide rail 301 and the second liquid-cooled guide rail 307 are respectively installed on the right side of the base plate 1, and the first liquid-cooled guide rail 301 is provided with a first liquid-cooled slider 302 and a second liquid-cooled slider 303 at both ends, and the second liquid-cooled guide rail 307 is provided with a third liquid-cooled slider 308 and a fourth liquid-cooled slider 309 at both ends. The two ends of a liquid-cooled support plate 304 are respectively installed on the first liquid-cooled slider 302 and the third liquid-cooled slider 308, the first liquid-cooled support plate 304 is provided with a first liquid-cooled fixed block 305 on the upper part, and a first test cold water plate 306 is provided on the first liquid-cooled fixed block 305, the second liquid-cooled support plate 310 is respectively installed on the second liquid-cooled slider 303 and the fourth liquid-cooled slider 309 at both ends, the second liquid-cooled support plate 310 is provided with a second liquid-cooled fixed block 311 on the upper part, and a second test cold water plate 312 is provided on the second liquid-cooled fixed block 311, and the symmetrical angles of the first test cold water plate 306 and the second test cold water plate 312 are respectively provided with cold water connection heads, and the cold water connection heads are connected with the test cold water connection head 204 through a cold water pipe.

[0041] Preferably, a heating plate 313 is provided on the inner side of the first test cold water plate 306 and the second test cold water plate 312, and the heating plate 313 is electrically connected to the test cold water test connector 203 through a wire. A plurality of temperature probes 314 are provided on the outer side of the first test cold water plate 306 and the second test cold water plate 312.

[0042] Preferably, the square lithium battery test fixture 4 includes a test fixture base plate 41, a test fixture support plate 42, and a test fixture probe device 43. A card slot 410 is provided at the bottom of the test fixture base plate 41, and the card slot 410 at the bottom of the test fixture base plate 41 is respectively installed on the first liquid cooling rail 301 and the second liquid cooling rail 307. Test fixture support plates 42 are provided at both ends of the test fixture base plate 41. A square lithium battery 5 is provided on the test fixture base plate 41. A test fixture probe device 43 is provided between the tops of the two test fixture support plates 42. A square lithium battery 5 is provided under the test fixture probe device 43. The test probe 438 on the test fixture probe device 43 is aligned with the positive and negative ears on the square lithium battery 5 for testing.

[0043] Preferably, the test fixture probe device 43 includes a probe fixing plate 431, a probe connecting rod 432, a probe linear axis 433, a first probe guide rod 434, a second probe guide rod 435, a probe quick handle 436, a probe mounting plate 437, and a test probe 438. The probe fixing plate 431 is installed on the top of the test fixture support plate 42. Guide holes are provided at both ends of the probe fixing plate 431. One end of the first probe guide rod 434 passes through the guide hole at one end of the probe fixing plate 431 and is connected to one end of the probe mounting plate 437, and is locked on the probe fixing plate 431 through the probe linear axis 433. One end of the second probe guide rod 435 The guide hole passing through the other end of the probe fixing plate 431 is connected to the other end of the probe mounting plate 437, and is locked on the probe fixing plate 431 through the probe linear axis 433. One end of the probe connecting rod 432 is installed in the middle of the probe mounting plate 437, and the other end of the probe connecting rod 432 passes through the circular hole in the middle of the probe fixing plate 431 and is connected to the probe quick handle 436. Grooves are provided at both ends of the probe mounting plate 437. The test probe 438 is installed in the grooves at both ends of the probe mounting plate 437, and the test probe 438 can move left and right in the groove. The test probe 438 is aligned with the positive and negative ears on the square lithium battery 5 for testing.

[0044] Preferably, a wiring board 420 is provided on the upper portion of the test fixture support plate 42 .

[0045] Preferably, a limit block 424 is provided on the inner side wall of the test fixture support plate 42, and the limit block 421 can place the square lithium battery 5 on the test fixture bottom plate 41 to prevent the square lithium battery 5 from loosening during testing.

[0046] Preferably, a groove is provided at the top of the test fixture support plate 42, and a locking component 44 is provided in the groove. The locking component 44 locks one end of the probe fixing plate 431 to the top of the test fixture support plate 42. The locking component 44 includes a locking handle 440, a locking connecting rod 441, and a locking nut 442. A locking nut 442 is provided in the groove at the top of the test fixture support plate 42, one end of the locking connecting rod 441 passes through one end of the probe fixing plate 431 and is connected to the locking nut 442, and the locking connecting rod 441 is fixed to the top of the test fixture support plate 42, and the other end of the locking connecting rod 441 is connected to the locking handle 440.

[0047] Preferably, baffles 101 are provided on both sides of the bottom plate 1 .

[0048] When in use, first open the locking component, place the square lithium battery on the bottom plate of the test fixture, and then lock it with the locking component. The inner wall of the test fixture support plate is provided with a limit block, and the limit block can place the square lithium battery on the bottom plate of the test fixture to prevent the square lithium battery from loosening during testing. The first test cold water plate and the second test cold water plate on the liquid-cooled test fixtures on both sides move left and right on the first liquid cooling rail and the second liquid cooling rail respectively, and fit on the square lithium battery. The test probe is aligned with the positive and negative ears on the square lithium battery for testing. When the cold water heads on the first test cold water plate and the second test cold water plate pass through the cold water When the water pipe is connected to the test cold water head, it plays a role in cooling the square lithium battery, simulating the low temperature function of the high and low temperature box to provide a low temperature test environment for the battery. Compared with traditional temperature boxes, it has lower energy consumption, more direct cooling, and provides a more accurate battery testing environment. When the heating plates on the first test cold water plate and the second test cold water plate are electrically connected to the test cold water test connector through wires, it plays a role in heating the square lithium battery, simulating the high temperature function of the high and low temperature box to provide a high temperature test environment for the battery. Compared with traditional temperature boxes, it has lower energy consumption, more direct heating, small temperature fluctuations, and provides a more accurate battery testing environment.

[0049] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also make appropriate changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A square lithium battery liquid cooling test device, used in high-performance battery test module equipment, characterized by: The utility model comprises a bottom plate, a test cold water device, a liquid cooling test fixture, and a square lithium battery test fixture. The test cold water device is provided on the left side of the bottom plate, the liquid cooling test fixture is provided on the right side of the test cold water device, and a square lithium battery test fixture is provided between two liquid cooling test fixtures. The two liquid cooling test fixtures move the square lithium battery under the test probe on the square lithium battery test fixture, and tighten the square lithium battery, and then drive the probe quick handle, and the driving probe quick handle drives the test probe to align with the pole ear on the square lithium battery for testing; the test cold water device comprises a test cold water fixing plate, a test cold water support plate, a test cold water test joint, a test cold water water head, and a test cold water external threaded joint A test cold water head, a test cold water fixing block, and a test cold water outer cover, wherein the test cold water support plate is installed on the upper left side of the bottom plate, a test cold water fixing plate is provided between the two test cold water support plates, a cold water inlet groove is provided at the lower part of the test cold water fixing plate, the test cold water inlet is embedded in the cold water inlet groove, a plurality of test joint holes of different sizes are provided at the upper part of the test cold water fixing plate, the test cold water test joint is embedded in the test joint holes of different sizes at the upper part of the test cold water fixing plate, the test cold water fixing block is fixed to the upper left side of the bottom plate by a nut, a round hole is provided in the middle part of the test cold water fixing block, and one end of the test cold water inlet passes through the test cold water fixing block The circular hole on the top is connected with the test cold water external threaded joint, and the test cold water outer cover seamlessly connects the test cold water water head, the test cold water external threaded joint, and the test cold water fixing block on the upper left side of the bottom plate; the liquid-cooled test fixture includes a first liquid-cooled guide rail, a first liquid-cooled slider, a second liquid-cooled slider, a first liquid-cooled support plate, a first liquid-cooled fixing block, a first test cold water plate, a second liquid-cooled guide rail, a third liquid-cooled slider, a fourth liquid-cooled slider, a second liquid-cooled support plate, a second liquid-cooled fixing block, and a second test cold water plate. The first liquid-cooled guide rail and the second liquid-cooled guide rail are respectively installed on the right side of the bottom plate, and the first liquid-cooled guide rail is provided with a first liquid-cooled slider and a second liquid-cooled slider at both ends. A third liquid-cooled slider and a fourth liquid-cooled slider are respectively provided at both ends of the liquid-cooled guide rail, both ends of the first liquid-cooled support plate are respectively installed on the first liquid-cooled slider and the third liquid-cooled slider, a first liquid-cooled fixed block is provided on the upper part of the first liquid-cooled support plate, and a first test cold water plate is provided on the first liquid-cooled fixed block, both ends of the second liquid-cooled support plate are respectively installed on the second liquid-cooled slider and the fourth liquid-cooled slider, a second liquid-cooled fixed block is provided on the upper part of the second liquid-cooled support plate, and a second test cold water plate is provided on the second liquid-cooled fixed block, and cold water connections are respectively provided at the symmetrical angles of the first test cold water plate and the second test cold water plate, and the cold water connections are connected with the test cold water connections through cold water pipes.

2. The square lithium battery liquid cooling test device according to claim 1, characterized in that: A heating plate is provided on the inner side of the first test cold water plate and the second test cold water plate, and the heating plate is electrically connected to the test cold water test connector through a wire. A plurality of temperature probes are provided on the outer side of the first test cold water plate and the second test cold water plate.

3. The square lithium battery liquid cooling test device according to claim 1, characterized in that: The square lithium battery test fixture includes a test fixture base plate, a test fixture support plate, and a test fixture probe device. A card slot is provided at the bottom of the test fixture base plate, and the card slot at the bottom of the test fixture base plate is respectively installed on the first liquid cooling rail and the second liquid cooling rail. Test fixture support plates are provided at both ends of the test fixture base plate. A square lithium battery is provided on the test fixture base plate. A test fixture probe device is provided between the tops of the two test fixture support plates. A square lithium battery is provided below the test fixture probe device. The test probes on the test fixture probe device are aligned with the positive and negative ears on the square lithium battery for testing.

4. The square lithium battery liquid cooling test device according to claim 3, characterized in that: The test fixture probe device includes a probe fixing plate, a probe connecting rod, a probe linear axis, a first probe guide rod, a second probe guide rod, a probe quick handle, a probe mounting plate, and a test probe. The probe fixing plate is installed on the top of the test fixture support plate, and guide holes are provided at both ends of the probe fixing plate. One end of the first probe guide rod passes through the guide hole at one end of the probe fixing plate and is connected to one end of the probe mounting plate, and is locked on the probe fixing plate through the probe linear axis. One end of the second probe guide rod passes through the guide hole at the other end of the probe fixing plate and is connected to the other end of the probe mounting plate, and is locked on the probe fixing plate through the probe linear axis. One end of the probe connecting rod is installed in the middle of the probe mounting plate, and the other end of the probe connecting rod passes through the circular hole in the middle of the probe fixing plate and is connected to the probe quick handle. Grooves are provided at both ends of the test probe mounting plate, and the probe is installed in the grooves at both ends of the probe mounting plate, and the test probe can move left and right in the groove. The test probe is aligned with the positive and negative ears on the square lithium battery for testing.

5. The square lithium battery liquid cooling test device according to claim 3, characterized in that: A wiring board is provided on the upper part of the test fixture support plate.

6. The square lithium battery liquid cooling test device according to claim 5, characterized in that: The inner side wall of the test fixture support plate is provided with a limit block, and the limit block can place the square lithium battery on the bottom plate of the test fixture to prevent the square lithium battery from loosening during testing.

7. The square lithium battery liquid cooling test device according to claim 6, characterized in that: A groove is provided on the top of the test fixture support plate, and a locking component is provided in the groove. The locking component locks one end of the probe fixing plate to the top of the test fixture support plate. The locking component includes a locking handle, a locking connecting rod, and a locking nut. A locking nut is provided in the groove on the top of the test fixture support plate, one end of the locking connecting rod passes through one end of the probe fixing plate and is connected to the locking nut, and the locking connecting rod is fixed to the top of the test fixture support plate, and the other end of the locking connecting rod is connected to the locking handle.

8. The square lithium battery liquid cooling test device according to claim 1, characterized in that: Baffles are arranged on both sides of the bottom plate.

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