Battery testing device

Abstract

The invention relates to the technical field of battery testing, and particularly discloses a battery testing device which comprises a solid block, a cover body, a charging connecting piece, a puncture plug and a pressure release valve, the solid block is concavely provided with a containing cavity with an opening, the peripheral wall of the solid block is provided with a pressure release hole and a puncture hole which are communicated with the containing cavity, and the containing cavity is used for fixedly arranging a battery; the cover body is fixedly arranged on the solid block and used for sealing the opening, and the cover body is provided with a mounting hole communicating with the containing cavity; the charging connecting piece is arranged in the mounting hole in a penetrating manner, seals the mounting hole and is used for charging the battery in the accommodating cavity; the puncture plug is detachably arranged on the solid block and seals the puncture hole; the pressure relief valve is arranged on the solid block and seals the pressure relief hole. When the battery is in thermal runaway, the temperature in the accommodating cavity rises quickly and the pressure is increased quickly, the pressure release valve can be damaged by the internal and external pressure difference of the accommodating cavity, and high-temperature and high-pressure gas in the accommodating cavity can be quickly discharged from the pressure release hole, so that the shell consisting of the solid block and the cover body can be prevented from being exploded.

Description

Technical Field

[0001] The present invention relates to the technical field of battery testing, and in particular to a battery testing device. Background Art

[0002] With the substantial development of photovoltaic, wind power, hydropower, nuclear power and other industries, the source of electric energy has become more extensive, clean and economical. The development and popularization of electric vehicles has reduced the use of traditional energy, alleviated environmental pollution and eased the energy crisis. Electric vehicles use power batteries as their power source, and improving the performance of power batteries is crucial to the development of electric vehicles. Cylindrical lithium batteries are widely used in automotive power battery packs due to their advantages such as high power and energy density and long life.

[0003] The operating temperature of lithium batteries cannot be too high, as high temperature will accelerate the degradation of the material performance inside the battery. When the operating temperature of the battery rises to a certain level, the electrolyte will begin to decompose, causing thermal runaway of the battery.

[0004] The most dangerous situation of lithium batteries is thermal runaway, which will release a large amount of toxic and high-temperature gases and generate a large amount of heat to transfer to adjacent batteries, thereby causing thermal runaway of other cells and eventually causing thermal runaway of the entire battery pack, fire, explosion and endangering human safety. In order to better control the thermal runaway of the battery pack, it is necessary to conduct thermal runaway testing on the battery to reduce the risk of thermal runaway of the battery pack.

[0005] Existing battery testing devices usually expose the battery directly to the external environment for testing. This testing method has great safety hazards and is very likely to cause harm to the testers and the testing environment. To avoid this problem, testers place the battery in a sealed shell for testing. However, when the battery has thermal runaway, the pressure in the sealed shell increases rapidly. If the high-pressure gas in the sealed cavity cannot be quickly discharged, there is still a risk of the shell exploding. Summary of the invention

[0006] The purpose of the present invention is to provide a battery testing device to solve the problem that in the related art, the battery is placed in a sealed shell for testing. When the battery has thermal runaway, the pressure in the sealed shell rises rapidly. If the high-pressure gas in the sealed cavity cannot be quickly discharged, the shell will still explode.

[0007] The present invention provides a battery testing device, which includes:

[0008] A solid block, wherein the solid block is provided with a receiving cavity with an open opening, a pressure relief hole and a puncture hole communicating with the receiving cavity are provided on a peripheral wall of the solid block, the receiving cavity is used to fix a battery, and an axis of the puncture hole intersects with the battery;

[0009] A cover body, the cover body is fixedly mounted on the solid block and used to close the opening, and the cover body is provided with a mounting hole communicating with the accommodating cavity;

[0010] A charging connector, which is inserted into the mounting hole and closes the mounting hole, and is used to connect the charging electrode of the battery in the accommodating cavity;

[0011] A puncture plug, which is detachably disposed on the solid block and seals the puncture hole;

[0012] A pressure relief valve is disposed on the solid block and closes the pressure relief hole.

[0013] As a preferred technical solution of the battery testing device, the cover body is also provided with a harness hole communicating with the accommodating cavity;

[0014] It also includes a temperature sensor and a voltage sensor, both of which are arranged in the accommodating cavity, and the wiring harnesses of the temperature sensor and the voltage sensor are led out of the accommodating cavity through the wiring harness hole, and a sealing structure is arranged between the wiring harnesses of the temperature sensor and the voltage sensor and the hole wall of the wiring harness hole.

[0015] As a preferred technical solution of the battery testing device, it also includes a sealing ring. The surface where the solid block abuts against the cover body is provided with a sealing ring, and the solid block and the cover body clamp the sealing ring.

[0016] As a preferred technical solution of the battery testing device, the peripheral wall of the solid block is provided with a liquid inlet hole and a liquid outlet hole, the liquid inlet hole and the liquid outlet hole are respectively provided on two opposite side walls of the solid block, and the distance between the liquid inlet hole and the bottom wall of the accommodating cavity is greater than the distance between the liquid outlet hole and the bottom wall of the accommodating cavity;

[0017] It also includes a liquid inlet plug and a liquid outlet plug. The liquid inlet plug can be detachably arranged on the solid block and close the liquid inlet hole. The liquid outlet plug can be detachably arranged on the solid block and close the liquid outlet hole.

[0018] As a preferred technical solution of the battery testing device, at least two liquid inlet holes are provided, and the at least two liquid inlet holes are arranged in sequence and spaced apart along the direction of the opening.

[0019] As a preferred technical solution of the battery testing device, a pressure measuring hole connected to the accommodating cavity is provided on the solid block or the cover;

[0020] It also includes a pressure sensor, which is arranged in the pressure measuring hole and closes the pressure measuring hole.

[0021] As a preferred technical solution for the battery testing device, it also includes a limiting bottom plate, which is laid on the bottom wall of the accommodating cavity and fixedly connected to the solid block. The limiting bottom plate is recessed with a stepped hole along the direction of the opening, and the battery in the accommodating cavity is inserted into the stepped hole so that the battery is spaced apart from the bottom wall of the accommodating cavity.

[0022] As an optimal technical solution for the battery testing device, it also includes a limiting top plate, the limiting bottom plate is arranged in the accommodating cavity, the limiting bottom plate is spaced apart from the limiting bottom plate along the direction of the opening, the limiting bottom plate is provided with a limiting hole along the direction of the opening, and the battery in the accommodating cavity is inserted into the limiting hole.

[0023] As a preferred technical solution of the battery testing device, it also includes a side support plate, which is arranged in the accommodating cavity and attached to the side wall of the accommodating cavity opposite to the puncture hole.

[0024] As a preferred technical solution for the battery testing device, the charging connector includes a positive electrode row, a negative electrode row and an insulating sleeve, the positive electrode row and the negative electrode row are inserted into the mounting hole, one end of the positive electrode row and one end of the negative electrode row located in the accommodating cavity are respectively connected to the positive electrode and the negative electrode of the battery in the accommodating cavity, the insulating sleeve is sleeved on the positive electrode row and the negative electrode row and is located in the mounting hole, and the insulating sleeve is used to close the gap between the mounting hole, the positive electrode row and the negative electrode row.

[0025] The beneficial effects of the present invention are:

[0026] The present invention provides a battery testing device, which includes a solid block, a cover body, a charging connector, a puncture plug and a pressure relief valve. The solid block is recessed with an open accommodating cavity, and the surrounding wall of the solid block is provided with a pressure relief hole and a puncture hole connected to the accommodating cavity, and the accommodating cavity is used to fix the battery; the cover body is fixed to the solid block and used to close the opening, and the cover body is provided with a mounting hole connected to the accommodating cavity; the charging connector is penetrated through the mounting hole and closes the mounting hole, and the charging connector is used to charge the battery in the accommodating cavity; the puncture plug is detachably provided on the solid block and closes the puncture hole; the pressure relief valve is provided on the solid block and closes the pressure relief hole. When the battery thermal runaway is tested by the battery testing device, the battery is first fixed in the accommodating cavity, and then the battery is overcharged through the charging connector, or the battery is punctured through the puncture hole, and then the changes of the battery during the thermal runaway process are recorded, such as the temperature of the battery, the voltage of the battery, and the temperature and pressure in the accommodating cavity. Due to thermal runaway of the battery, the temperature in the containment chamber rises rapidly, and the pressure increases rapidly. The pressure relief valve will be destroyed by the pressure difference between the inside and outside of the containment chamber, and the high-temperature and high-pressure gas in the containment chamber will be quickly discharged from the pressure relief hole, thereby avoiding the explosion of the shell composed of the solid block and the cover body. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the structure of a battery testing device according to an embodiment of the present invention;

[0028] Figure 2 Schematic diagram of the structure of the battery testing device in the embodiment of the present invention (excluding the cover);

[0029] Figure 3 Schematic diagram of the structure of the battery testing device in the embodiment of the present invention (excluding the cover body and the limiting top plate);

[0030] Figure 4 Schematic diagram of the structure of the battery testing device in an embodiment of the present invention (excluding the solid block and the cover).

[0031] In the figure:

[0032] 100. Battery;

[0033] 1. solid block; 11. accommodating cavity; 12. puncture hole; 13. liquid inlet hole; 14. liquid outlet hole;

[0034] 2. Cover body; 21. Wire harness hole;

[0035] 3. Charging connector; 31. Positive electrode row; 32. Negative electrode row; 33. Insulating sleeve;

[0036] 4. Pressure sensor; 5. Pressure relief valve; 6. Sealing ring; 7. Limiting bottom plate; 71. Step hole; 8. Limiting top plate; 81. Limiting hole; 9. Side support plate; 10. Support column. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0041] like Figure 1 to Figure 4As shown, this embodiment provides a battery testing device, which includes a solid block 1, a cover body 2, a charging connector 3, a puncture plug and a pressure relief valve 5. The solid block 1 is recessed with an open accommodating cavity 11, and the surrounding wall of the solid block 1 is provided with a pressure relief hole and a puncture hole 12 connected to the accommodating cavity 11, and the accommodating cavity 11 is used to fix the battery 100; the cover body 2 is fixed to the solid block 1 and used to close the opening, and the cover body 2 is provided with a mounting hole connected to the accommodating cavity 11; the charging connector 3 is penetrated through the mounting hole and closes the mounting hole, and the charging connector 3 is used to charge the battery 100 in the accommodating cavity 11; the puncture plug is detachably provided on the solid block 1 and closes the puncture hole 12; the pressure relief valve 5 is provided on the solid block 1 and closes the pressure relief hole. When the battery 100 is tested for thermal runaway by the battery testing device, the battery 100 is first fixed in the accommodating chamber 11, and then the battery 100 is overcharged through the charging connector 3, or the battery 100 is punctured through the puncture hole 12, and then the changes of the battery 100 during the thermal runaway of the battery 100 are recorded, such as the temperature of the battery 100, the voltage of the battery 100, and the temperature and pressure in the accommodating chamber 11. Due to the thermal runaway of the battery 100, the temperature in the accommodating chamber 11 rises rapidly, and when the pressure increases rapidly, the pressure relief valve 5 will be destroyed by the pressure difference between the inside and outside of the accommodating chamber 11, and the high-temperature and high-pressure gas in the accommodating chamber 11 will be quickly discharged from the pressure relief hole, thereby avoiding the explosion of the shell composed of the solid block 1 and the cover body 2.

[0042] Optionally, the accommodating cavity 11 is machined on the solid block 1 by a milling process. After the opening of the accommodating cavity 11 is closed by the cover body 2, it is only necessary to consider the sealing of the connection between the cover body 2 and the solid block 1, and the connection strength between the cover body 2 and the solid block 1. Compared with the accommodating cavity 11 enclosed by welding or gluing, the workload of sealing the accommodating cavity 11 is effectively reduced.

[0043] Specifically, when it is necessary to perform a puncture test on the battery 100, the puncture plug is pulled out from the puncture hole 12, and then the puncture needle is inserted into the accommodating cavity 11 through the puncture hole 12, and the battery 100 is subjected to a puncture test by the puncture needle. When it is not necessary to perform a puncture test on the battery 100, the puncture plug is inserted into the puncture hole 12 to ensure the sealing of the accommodating cavity 11.

[0044] Optionally, the surface where the solid block 1 abuts against the cover body 2 is provided with a plurality of threaded holes at intervals around the axis of the opening, the cover body 2 is provided with through holes corresponding to the plurality of threaded holes one by one, the plurality of bolts, the plurality of through holes and the plurality of threaded holes correspond one by one, the bolts pass through the corresponding through holes and are screwed with the corresponding threaded holes. This arrangement can ensure the connection strength between the solid block 1 and the cover body 2.

[0045] Optionally, the cover body 2 is also provided with a harness hole 21 connected to the accommodating cavity 11; the battery testing device also includes a temperature sensor and a voltage sensor, both of which are arranged in the accommodating cavity 11, and the harnesses of the temperature sensor and the voltage sensor are led out of the accommodating cavity 11 through the harness hole 21, and a sealing structure is provided between the harnesses of the temperature sensor and the voltage sensor and the hole wall of the harness hole 21. In this embodiment, the temperature sensor is used to monitor the temperature in the accommodating cavity 11, and then transmit the detected information through the harness. The voltage sensor is used to monitor the voltage of the battery 100 in the accommodating cavity 11, and then transmit the detected information through the harness. In order to ensure the sealing of the accommodating cavity 11, a sealing structure is used to fill the gap between the harness and the hole wall of the harness hole 21. Preferably, the sealing structure can be a sealant.

[0046] Optionally, the battery testing device further comprises a sealing ring 6, and the sealing ring 6 is provided on the surface where the entity block 1 abuts the cover body 2, and the entity block 1 and the cover body 2 clamp the sealing ring 6. In this embodiment, in order to improve the sealing between the entity block 1 and the cover body 2, a sealing ring 6 is provided between the entity block 1 and the cover body 2, and a plurality of through holes corresponding to the plurality of threaded holes are provided on the sealing ring 6, and bolts pass through the through holes and the through holes in turn and are screwed to the threaded holes. This arrangement can prevent the sealing ring 6 from detaching from the abutting portion between the entity block 1 and the cover body 2, thereby causing failure of the seal. Preferably, the sealing ring 6 is made of rubber.

[0047] Optionally, the peripheral wall of the entity block 1 is provided with a liquid inlet hole 13 and a liquid outlet hole 14, and the liquid inlet hole 13 and the liquid outlet hole 14 are respectively provided on two opposite side walls of the entity block 1, and the distance between the liquid inlet hole 13 and the bottom wall of the accommodating chamber 11 is greater than the distance between the liquid outlet hole 14 and the bottom wall of the accommodating chamber 11; the battery testing device also includes a liquid inlet plug and a liquid outlet plug, the liquid inlet plug is detachably provided on the entity block 1 and closes the liquid inlet hole 13, and the liquid outlet plug is detachably provided on the entity block 1 and closes the liquid outlet hole 14. In this embodiment, by connecting the liquid outlet of the external coolant circulation system with the liquid inlet hole 13 on the entity block 1, and connecting the liquid inlet of the external coolant circulation system with the liquid outlet hole 14 on the entity block 1, the coolant can be circulated in the accommodating chamber 11, and the liquid cooling function in the immersed battery pack can be simulated to test the thermal runaway of the battery 100 under the premise of coolant cooling.

[0048] Optionally, at least two liquid inlet holes 13 are provided, and the at least two liquid inlet holes 13 are arranged in sequence and spaced apart along the direction of the opening. In this embodiment, by connecting the liquid outlet of the external coolant circulation system to different liquid inlet holes 13, the cooling effect of the liquid inlet holes 13 at different heights on the battery 100 can be tested.

[0049] Optionally, a pressure measuring hole connected to the accommodating cavity 11 is provided on the solid block 1 or the cover body 2; the battery testing device further comprises a pressure sensor 4, which is disposed in the pressure measuring hole and closes the pressure measuring hole. In this embodiment, the pressure measuring hole can detect the change data of the pressure in the accommodating cavity 11. The pressure measuring hole is a threaded hole, and the pressure sensor 4 is screwed into the pressure measuring hole, thereby achieving the sealing of the pressure measuring hole.

[0050] Optionally, the battery testing device further includes a limiting bottom plate 7, which is laid on the bottom wall of the accommodating cavity 11 and fixedly connected to the solid block 1. The limiting bottom plate 7 is recessed with a stepped hole 71 along the direction of the opening, and the battery 100 in the accommodating cavity 11 is inserted into the stepped hole 71 so that the battery 100 is spaced apart from the bottom wall of the accommodating cavity 11. In this embodiment, this arrangement can limit the battery 100 in a direction perpendicular to the direction of the opening. At the same time, the battery 100 is spaced apart from the bottom wall of the accommodating cavity 11, and this arrangement leaves an exhaust space at the bottom of the battery 100 to prevent the pressure from being out of control. Specifically, a plurality of stepped holes 71 can be provided, and a plurality of batteries 100 are inserted into the corresponding stepped holes 71 one by one.

[0051] Optionally, the material of the limiting bottom plate 7 is insulating bakelite, which has high mechanical strength, good insulation, heat resistance and corrosion resistance.

[0052] Optionally, the battery testing device further includes a limiting top plate 8, a limiting bottom plate 7 is arranged in the accommodating cavity 11, the limiting bottom plate 7 is spaced apart from the limiting bottom plate 7 along the direction of the opening, the limiting bottom plate 7 is provided with a limiting hole 81 along the direction of the opening, and the battery 100 in the accommodating cavity 11 is inserted into the limiting hole 81. In this embodiment, the limiting bottom plate 7 and the limiting top plate 8 are spaced apart along the direction of the opening, and this arrangement limits both ends of the battery 100, thereby improving the stability of fixing the battery 100. Specifically, a plurality of limiting holes 81 are provided, and the plurality of limiting holes 81 correspond to the plurality of stepped holes 71 one by one, and the plurality of batteries 100 are respectively inserted into the limiting holes 81 and the corresponding stepped holes 71. Optionally, the material of the limiting top plate 8 is insulating bakelite.

[0053] Optionally, the battery testing device further comprises a support column 10, one end of the support column 10 is fixedly connected to the limiting bottom plate 7, and the other end of the support column 10 is fixedly connected to the limiting top plate 8. The support column 10 is used to support the limiting top plate 8, so that the limiting bottom plate 7 and the limiting top plate 8 are spaced apart. Optionally, a plurality of support columns 10 are provided, and the plurality of support columns 10 are spaced apart around the circumference of the limiting bottom plate 7.

[0054] Optionally, the battery testing device further comprises a side support plate 9, which is arranged in the accommodating cavity 11, and the side support plate 9 is attached to the side wall of the accommodating cavity 11 opposite to the puncture hole 12. In this embodiment, when the puncture needle extends into the puncture hole 12 and punctures the battery 100, there is a possibility that the battery 100 will deform toward the side wall of the accommodating cavity 11 opposite to the puncture hole 12. When this happens, the side support plate 9 can support the battery 100, thereby reducing the deformation of the battery 100. Preferably, the side support plate 9 is arranged in contact with the battery 100. Optionally, the material of the side support plate 9 is insulating bakelite.

[0055] Optionally, the battery testing device further comprises a side support plate 9, which is disposed in the accommodating cavity 11 and attached to the side wall of the accommodating cavity 11 opposite to the puncture hole 12, and the side support plate 9 abuts against the battery 100 in the accommodating cavity 11. In this embodiment, when the battery 100 is subjected to a puncture test, during the process of the puncture needle being inserted into the battery 100, the battery 100 will be subjected to a force in a direction away from the puncture hole 12, thereby causing the battery 100 to tip over in a direction away from the puncture hole 12. To avoid this phenomenon, a side support plate 9 is further provided between the side wall of the accommodating cavity 11 opposite to the puncture hole 12 and the battery 100, thereby preventing the battery 100 from tipping over, and facilitating the insertion of the puncture needle into the battery 100.

[0056] Optionally, the charging connector 3 includes a positive electrode row 31, a negative electrode row 32 and an insulating sleeve 33. The positive electrode row 31 and the negative electrode row 32 are inserted into the mounting hole. One end of the positive electrode row 31 and one end of the negative electrode row 32 located in the accommodating cavity 11 are respectively connected to the positive electrode and the negative electrode of the battery 100 in the accommodating cavity 11. The insulating sleeve 33 is sleeved on the positive electrode row 31 and the negative electrode row 32 and is located in the mounting hole. The insulating sleeve 33 is used to close the gap between the mounting hole, the positive electrode row 31 and the negative electrode row 32. In this embodiment, the other end of the positive electrode row 31 and the other end of the negative electrode row 32 are respectively connected to the external power supply, so that the battery 100 in the accommodating cavity 11 can be charged. The insulating sleeve 33 plays a role in closing the gap between the mounting hole, the positive electrode row 31 and the negative electrode row 32 on the one hand, and supports the positive electrode row 31 and the negative electrode row 32 on the other hand. Specifically, the insulating sleeve 33 is a polytetrafluoroethylene filling block.

[0057] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery testing device, characterized in that: include: A solid block (1), wherein the solid block (1) is provided with a recessed accommodating cavity (11) with an opening, and a peripheral wall of the solid block (1) is provided with a pressure relief hole and a puncture hole (12) communicating with the accommodating cavity (11), and the accommodating cavity (11) is used to securely mount a battery (100); A cover body (2), the cover body (2) being fixedly mounted on the solid block (1) and used to close the opening, the cover body (2) being provided with a mounting hole communicating with the accommodating cavity (11); a charging connector (3), which is inserted into the mounting hole and closes the mounting hole, and the charging connector (3) is used to connect the charging electrode of the battery (100) in the accommodating cavity (11); A puncture plug, which is detachably arranged on the solid block (1) and seals the puncture hole (12); A pressure relief valve (5), the pressure relief valve (5) being arranged on the solid block (1) and closing the pressure relief hole.

2. The battery testing device according to claim 1, characterized in that: The cover body (2) is also provided with a harness hole (21) communicating with the accommodating cavity (11); It also includes a temperature sensor and a voltage sensor, both of which are arranged in the accommodating cavity (11), and the wiring harnesses of the temperature sensor and the voltage sensor are led out of the accommodating cavity (11) through the wiring harness hole (21), and a sealing structure is arranged between the wiring harnesses of the temperature sensor and the voltage sensor and the hole wall of the wiring harness hole (21).

3. The battery testing device according to claim 1, characterized in that: It also comprises a sealing ring (6). The surface where the solid block (1) abuts against the cover body (2) is provided with a sealing ring (6). The solid block (1) and the cover body (2) clamp the sealing ring (6).

4. The battery testing device according to claim 1, characterized in that: The peripheral wall of the solid block (1) is provided with a liquid inlet hole (13) and a liquid outlet hole (14), the liquid inlet hole (13) and the liquid outlet hole (14) are respectively arranged on two opposite side walls of the solid block (1), and the distance between the liquid inlet hole (13) and the bottom wall of the accommodating cavity (11) is greater than the distance between the liquid outlet hole (14) and the bottom wall of the accommodating cavity (11); It also comprises a liquid inlet plug and a liquid outlet plug, wherein the liquid inlet plug is detachably arranged on the solid block (1) and closes the liquid inlet hole (13), and the liquid outlet plug is detachably arranged on the solid block (1) and closes the liquid outlet hole (14).

5. The battery testing device according to claim 4, characterized in that: At least two liquid inlet holes (13) are provided, and the at least two liquid inlet holes (13) are arranged in sequence and at intervals along the direction of the opening.

6. The battery testing device according to claim 1, characterized in that: The solid block (1) or the cover body (2) is provided with a pressure measuring hole connected to the accommodating cavity (11); It also comprises a pressure sensor (4), wherein the pressure sensor (4) is arranged in the pressure measuring hole and closes the pressure measuring hole.

7. The battery testing device according to claim 1, characterized in that: The invention also comprises a limiting bottom plate (7), the limiting bottom plate (7) being laid on the bottom wall of the accommodating cavity (11) and being fixedly connected to the solid block (1), the limiting bottom plate (7) being recessed with a stepped hole (71) along the direction of the opening, the battery (100) in the accommodating cavity (11) being inserted into the stepped hole (71) so that the battery (100) is spaced apart from the bottom wall of the accommodating cavity (11).

8. The battery testing device according to claim 7, characterized in that: It also includes a limiting top plate (8), the limiting bottom plate (7) being arranged in the accommodating cavity (11), the limiting bottom plate (7) being spaced apart from the limiting bottom plate (7) along the direction of the opening, the limiting bottom plate (7) being provided with a limiting hole (81) along the direction of the opening, and the battery (100) in the accommodating cavity (11) being inserted into the limiting hole (81).

9. The battery testing device according to claim 8, characterized in that: It also includes a side support plate (9), which is arranged in the accommodating cavity (11), and the side support plate (9) is attached to the side wall of the accommodating cavity (11) opposite to the puncture hole (12).

10. The battery testing device according to claim 1, characterized in that: The charging connector (3) comprises a positive electrode row (31), a negative electrode row (32) and an insulating sleeve (33); the positive electrode row (31) and the negative electrode row (32) are inserted into the mounting hole; one end of the positive electrode row (31) and one end of the negative electrode row (32) located in the accommodating cavity (11) are respectively connected to the positive electrode and the negative electrode of the battery (100) in the accommodating cavity (11); the insulating sleeve (33) is sleeved on the positive electrode row (31) and the negative electrode row (32) and is located in the mounting hole; the insulating sleeve (33) is used to close the gap between the mounting hole, the positive electrode row (31) and the negative electrode row (32).

Images