Detection box

Abstract

The utility model relates to the technical field of power battery detection, and discloses a detection box which comprises a shell, a mounting frame, a heating piece, an explosion venting assembly and a measuring piece. The shell comprises a box body and a cover plate; an accommodating cavity is formed in the box body; the mounting frame is placed in the accommodating cavity; the heating piece is attached to the outer side of the battery cell to provide heat; the explosion venting assembly comprises an explosion venting pipe and a one-way valve; an air passage is arranged in the explosion venting pipe and is communicated with the accommodating cavity; the one-way valve is arranged on the side, away from the box body, of the explosion venting pipe and covers the air channel. The measuring piece is used for measuring the gas flow rate in the gas channel. The battery cell is fixed in the box body through the mounting frame, the heating piece heats the battery cell until thermal runaway, the explosion venting pipe is arranged to lead out airflow generated by explosion in the box body, and the measuring piece is arranged on the explosion venting pipe to detect the flow rate of gas in the gas channel, so that the impact load generated at the moment of thermal runaway of the battery cell is measured. Therefore, the design and research work of the battery shell structure can be carried out.

Description

Technical Field

[0001] The utility model relates to the technical field of power battery detection, in particular to a detection box. Background Art

[0002] In recent years, the electric vehicle industry has developed rapidly globally. The core component of an electric vehicle is the power battery; in China, lithium-ion batteries are mainly used for electric vehicle power batteries. However, due to frequent reports of fires and explosions caused by lithium-ion batteries, their safety issues have attracted much attention. The safety issues of lithium-ion batteries are mainly caused by thermal runaway. High temperature, overcharging, over-discharging, etc. are important reasons for the thermal runaway of lithium-ion batteries.

[0003] Existing power battery detection equipment mainly focuses on the detection of the thermal runaway state of the battery, that is, detecting how large the current and voltage reach during battery charging and discharging and how long it takes for the power battery to experience thermal runaway. However, there is no existing detection equipment that studies the energy generated at the moment when the battery undergoes thermal runaway. Studying the energy generated when the power battery undergoes thermal runaway is beneficial to the design and research of the battery housing structure strength. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is:

[0005] Currently, there is a lack of detection equipment for the energy generated at the moment when the battery cell undergoes thermal runaway.

[0006] To solve the above technical problems, the utility model provides a detection box, including:

[0007] A housing, the housing includes a box body and a cover plate; a receiving cavity is arranged in the box body, and the cover plate seals the receiving cavity;

[0008] A mounting rack, placed in the receiving cavity, and the mounting rack is used to clamp and fix the battery cell in the receiving cavity;

[0009] A heating element, arranged in the receiving cavity, and the heating element is used to attach to the outside of the battery cell to provide heat to the battery cell;

[0010] A pressure relief assembly, the pressure relief assembly includes a pressure relief pipe and a one-way valve; one end of the pressure relief pipe is connected to the box body, an air channel is arranged in the pressure relief pipe, and the air channel is communicated with the receiving cavity; the one-way valve is arranged on the side of the pressure relief pipe away from the box body, and the one-way valve seals the air channel; and

[0011] A measuring member, connected to the pressure relief pipe, and the measuring member is used to measure the gas flow rate in the air channel.

[0012] In one embodiment, the one-way valve is hinged to the explosion vent pipe, and the one-way valve rotates relative to the explosion vent pipe to open or close the air passage;

[0013] Wherein, when the one-way valve rotates to the state of closing the air passage, the explosion vent pipe abuts against one side of the one-way valve close to the box body.

[0014] In one embodiment, the one-way valve includes a cover part, an extension part and a hinge part; the cover part is in a straight plate shape, and the cover part covers one end of the explosion vent pipe away from the box body; the extension part protrudes on one side of the cover part close to the explosion vent pipe, and the extension part is in a long strip shape and extends along the rotation axis direction of the one-way valve relative to the explosion vent pipe; the hinge part is in a cylindrical shape, and on the extension direction of the extension part, the hinge parts are oppositely arranged on both sides of the extension part.

[0015] In one embodiment, an embedding groove is arranged on the explosion vent pipe; the embedding groove is arranged at one end of the explosion vent pipe away from the box body, and on the extension direction of the extension part, hinge holes are oppositely arranged on both sides of the embedding groove, the hinge holes are in a circular groove shape, the extension part correspondingly embeds into the embedding groove, and the hinge part is inserted into the hinge hole.

[0016] In one embodiment, the outer shell further includes a sealing gasket; the sealing gasket is in a ring shape, the sealing gasket extends along the periphery of the cover plate, and the sealing gasket is clamped between the box body and the cover plate.

[0017] In one embodiment, the measuring member is provided with an air inlet and an air outlet; the air inlet faces one side of the air passage close to the box body, and the air outlet faces one side of the air passage close to the one-way valve.

[0018] In one embodiment, the heating member includes a heating part and a wire part; the heating part is in a straight plate shape, the number of the heating parts is multiple, the heating parts are used for attaching to the outer side of the battery cell, and the wire part connects each heating part.

[0019] In one embodiment, a wire passing hole is arranged on the cover plate, and the wire part passes through the wire passing hole; a blocking block is arranged on the cover plate, the blocking block is arranged around the outside of the wire part, and the blocking block covers the wire passing hole.

[0020] In one embodiment, the mounting bracket includes a connecting rod and a pressing plate; the connecting rod is in a straight rod shape, and the pressing plates are oppositely arranged at both ends of the connecting rod to clamp and fix the battery cell between the pressing plates at both ends.

[0021] In one embodiment, the pressing plate is in the shape of a rectangular straight plate, and the connecting rods are respectively arranged at the corner positions of the pressing plate.

[0022] The beneficial effects of the above detection box are as follows:

[0023] The battery cell is fixed in the box body through the mounting frame, the battery cell is heated by the heating element until thermal runaway occurs, the airflow generated by the explosion in the box body is led out through the explosion vent pipe, and the gas flow rate in the airway is detected by arranging a measuring element on the explosion vent pipe, so as to measure the impact load generated at the moment of thermal runaway of the battery cell, which is beneficial to carrying out the design and research work of the battery housing structure and improving the safety of the power battery.

[0024] By designing the one-way valve as a cover part, an extension part and a hinge part, an embedding groove is arranged on the explosion vent pipe, and by embedding the extension part into the embedding groove, it is ensured that the cover part is closely attached to the end of the explosion vent pipe, and at the same time, it is ensured that the outside air cannot enter the airway through the one-way valve, thereby improving the accuracy of measuring the energy impact load generated when the battery cell undergoes thermal runaway and eliminating the influence of the external environment on the test. Description of the Drawings

[0025] Figure 1 It is a schematic structural diagram of a detection box according to an embodiment of the present invention;

[0026] Figure 2 It is Figure 1 the exploded structural diagram of the detection box in

[0027] Figure 3 It is Figure 1 the enlarged schematic diagram of part A in the circle in

[0028] Figure 4 It is Figure 1 the enlarged schematic diagram of part B in the circle in

[0029] Figure 5 It is Figure 2 the structural diagram of the one-way valve in

[0030] Figure 6 It is Figure 2 the structural diagram of the measuring element in

[0031] The meanings of the reference numerals in the drawings are as follows:

[0032] 100, detection box;

[0033] 10, outer shell; 11, box body; 111, accommodating cavity; 12, cover plate; 121, wire passing hole; 125, plug; 13, sealing gasket;

[0034] 20, mounting frame; 21, connecting rod; 22, pressing plate;

[0035] 30. Heating element; 31. Heating part; 32. Wire part;

[0036] 40. Pressure relief assembly; 41. Pressure relief pipe; 411. Air passage; 415. Embedded groove; 416. Hinge hole; 42. Check valve; 421. Cover part; 422. Extension part; 423. Hinge part;

[0037] 50. Measuring part; 51. Air inlet; 52. Air outlet;

[0038] 90. Battery cell. Detailed implementation manners

[0039] In order to make the above objects, features and advantages of the present utility model more obvious and understandable, the following will describe in detail the specific implementation manners of the present utility model with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0040] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model 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 should not be construed as limiting the present utility model.

[0041] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0042] In the present utility model, unless otherwise clearly specified or limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0043] In the present utility model, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0044] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be a middle element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a middle element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0045] Please refer to Figures 1 to 6, the detection box 100 according to an embodiment of the present invention includes a housing 10, a mounting bracket 20, a heating element 30, a pressure relief assembly 40, and a measuring element 50. The housing 10 includes a box body 11 and a cover plate 12; a receiving cavity 111 is provided in the box body 11, and the cover plate 12 seals the receiving cavity 111. The cover plate 12 is used to open or close the receiving cavity 111 to allow the battery cell 90 to be inserted into the receiving cavity 111 for detection. The mounting bracket 20 is placed in the receiving cavity 111, and the mounting bracket 20 is used to clamp and fix the battery cell 90 in the receiving cavity 111. The heating element 30 is provided in the receiving cavity 111, and the heating element 30 is used to attach to the outside of the battery cell 90 to provide heat to the battery cell 90, causing the battery cell 90 to undergo thermal runaway. The pressure relief assembly 40 includes a pressure relief pipe 41 and a one-way valve 42; one end of the pressure relief pipe 41 is connected to the box body 11, an air passage 411 is provided in the pressure relief pipe 41, and the air passage 411 is communicated with the receiving cavity 111; the one-way valve 42 is provided on the side of the pressure relief pipe 41 away from the box body 11, and the one-way valve 42 seals the air passage 411 to export the impact load generated when the battery cell 90 undergoes thermal runaway through the air passage 411. The measuring element 50 is connected to the pressure relief pipe 41, and the measuring element 50 is used to measure the gas flow rate in the air passage 411, thereby realizing the measurement of the impact load generated when the battery cell 90 undergoes thermal runaway.

[0046] Further, the box body 11 has a hollow rectangular structure, and a receiving cavity 111 is opened inside the box body 11. The receiving cavity 111 is used to receive the battery cell 90 to be detected, and the opening of the receiving cavity 111 faces the cover plate 12. The cover plate 12 is in the shape of a rectangular straight plate, and the cover plate 12 is sealed on the box body 11. The periphery of the cover plate 12 is connected and fixed to the box body 11 to make the receiving cavity 111 form a relatively closed space, ensuring the accuracy of measuring the energy impact generated when the battery cell 90 undergoes thermal runaway. In this embodiment, the housing 10 further includes a sealing gasket 13. The sealing gasket 13 is in a ring shape and extends along the periphery of the cover plate 12. The sealing gasket 13 is clamped between the box body 11 and the cover plate 12, and the sealing gasket 13 is used to seal the joint position between the box body 11 and the cover plate 12. It can be understood that the sealing gasket 13 is a rubber part.

[0047] Further, the mounting bracket 20 includes a connecting rod 21 and a pressing plate 22. The connecting rod 21 is in the shape of a straight rod, the pressing plate 22 is in the shape of a straight plate, the pressing plates 22 are oppositely arranged at both ends of the connecting rod 21, and the extending plane where the pressing plates 22 are located is perpendicular to the extending direction of the connecting rod 21. The pressing plates 22 are used to abut against the battery cell 90 to clamp and fix the battery cell 90 between the pressing plates 22 at both ends. In this embodiment, the pressing plates 22 are in the shape of rectangular straight plates, and the connecting rods 21 are respectively arranged at the corner positions of the pressing plates 22 to ensure that the force applied by the connecting rods 21 to the pressing plates 22 is more balanced, thereby improving the stability of the pressing plates 22 to clamp and fix the battery cell 90. The end of the connecting rod 21 and the pressing plate 22 are fixed by screws, and the screws pass through the pressing plate 22 and are threadedly connected to the end of the connecting rod 21.

[0048] Further, the heating member 30 includes a heating portion 31 and a wire portion 32. The heating portion 31 is in a straight plate shape and is used to adhere to the outer side of the battery cell 90, and the heating portion 31 is used to provide heat to the battery cell 90. The wire portion 32 is electrically connected to the heating portion 31. One end of the wire portion 32 is connected to the heating portion 31, and the other end of the wire portion 32 extends to the outside of the housing 10 to be connected to an external power source. In this embodiment, the number of the heating portions 31 is multiple. The wire portion 32 connects each heating portion 31, and the wire portion 32 delivers electric quantity to each heating portion 31 to heat the battery cell 90, so that the battery cell 90 undergoes thermal runaway. Preferably, a plurality of battery cells 90 are provided, and each battery cell 90 is arranged at intervals in sequence between the pressing plates 22 on both sides, and the heating portion 31 is clamped between two adjacent battery cells 90. The heating portion 31 is an electric heating sheet.

[0049] Further, a wire passing hole 121 is provided on the cover plate 12. The wire passing hole 121 is in a through hole shape and is communicated with the accommodating cavity 111. The wire portion 32 passes through the wire passing hole 121 to ensure that the wire portion 32 introduces external electric quantity into the heating portion 31. In this embodiment, a blocking block 125 is provided on the cover plate 12. The blocking block 125 is arranged around the outside of the wire portion 32, and the blocking block 125 seals the wire passing hole 121. The blocking block 125 is used to block the joint position between the cover plate 12 and the wire portion 32 to eliminate the influence of the external environment on the test result. The blocking block 125 is a rubber part. In another embodiment, the blocking block 125 can be replaced by glue. That is, after the wire portion 32 passes through the cover plate 12, sealing glue is applied to the wire passing hole 121 to seal the wire passing hole 121.

[0050] Further, the explosion vent pipe 41 is provided on one side of the box body 11. The explosion vent pipe 41 is in a hollow straight pipe shape, and an air passage 411 penetrates through both ends of the explosion vent pipe 41. One end of the air passage 411 is communicated with the accommodating cavity 111, and the other end of the air passage 411 is communicated with the outside to export the energy impact generated during the thermal runaway of the battery cell 90. The one-way valve 42 is hinged to the explosion vent pipe 41, and the one-way valve 42 rotates relative to the explosion vent pipe 41 to open or close the air passage 411. Among them, when the one-way valve 42 rotates to the state of closing the air passage 411, the explosion vent pipe 41 abuts against the side of the one-way valve 42 close to the box body 11 to ensure that external air cannot enter the accommodating cavity 111 through the one-way valve 42, thereby ensuring the accuracy of the test result. In this embodiment, the explosion vent pipe 41 and the box body 11 are an integral part to improve the connection reliability between the explosion vent pipe 41 and the box body 11. At the same time, the integral forming structure can ensure the airtightness at the joint position between the explosion vent pipe 41 and the box body 11.

[0051] Further, the one-way valve 42 includes a cover portion 421, an extension portion 422, and a hinge portion 423. The cover portion 421 is in a straight plate shape and covers one end of the explosion vent pipe 41 away from the box body 11. The extension portion 422 protrudes from the side of the cover portion 421 close to the explosion vent pipe 41, and the extension portion 422 is in a long strip shape and extends along the rotation axis direction of the one-way valve 42 relative to the explosion vent pipe 41. The hinge portion 423 is in a cylindrical shape. In the extension direction of the extension portion 422, the hinge portion 423 is oppositely arranged on both sides of the extension portion 422, and the extension direction of the extension portion 422 is the rotation axis direction of the one-way valve 42 relative to the explosion vent pipe 41. In this embodiment, an embedding groove 415 is provided on the explosion vent pipe 41. The embedding groove 415 is provided at one end of the explosion vent pipe 41 away from the box body 11. In the extension direction of the extension portion 422, hinge holes 416 are oppositely arranged on both sides of the embedding groove 415. The hinge holes 416 are in a circular groove shape. The extension portion 422 is correspondingly embedded in the embedding groove 415, and the hinge portion 423 is inserted into the hinge holes 416. By embedding the extension portion 422 into the embedding groove 415, the tightness of the fit between the cover portion 421 and the end of the explosion vent pipe 41 is ensured, thereby improving the sealing performance of the one-way valve 42 for the air passage 411; by inserting the hinge portion 423 into the hinge holes 416, the one-way valve 42 is hinged to the explosion vent pipe 41. When the battery cell 90 undergoes thermal runaway, the impact load will push the one-way valve 42 upward away from the box body 11, thereby opening the air passage 411, and the impact air flow is discharged through the air passage 411; after the thermal runaway of the battery cell 90 is completed, the impact load disappears, and the one-way valve 42 rotates back under its own gravity until the cover portion 421 fits with the explosion vent pipe 41, and the air passage 411 is closed.

[0052] Further, the measuring member 50 is provided with an air inlet 51 and an air outlet 52. One end of the measuring member 50 passes through the explosion vent pipe 41 and is inserted into the air passage 411. Both the air inlet 51 and the air outlet 52 are provided at the end of the measuring member 50 inserted into the air passage 411. The air inlet 51 faces the side of the air passage 411 close to the box body 11, and the air outlet 52 faces the side of the air passage 411 close to the one-way valve 42. When the battery cell 90 undergoes thermal runaway, during the process of the impact air flow flowing through the air passage 411 and being discharged, part of the impact air flow will enter the measuring member 50 from the air inlet 51 and be discharged from the air outlet 52. The measuring member 50 detects the flow rate of the air flow to judge the energy of the impact load, thereby measuring the energy impact released by the battery cell 90 at the moment of thermal runaway.

[0053] In summary, the embodiment of the present utility model provides a detection box 100, and its beneficial effects are as follows:

[0054] The battery cell 90 is fixed in the box body 11 through the mounting bracket 20, the battery cell 90 is heated by the heating element 30 until the battery cell 90 undergoes thermal runaway, the airflow generated by the explosion in the box body 11 is led out through the explosion vent pipe 41, and the gas flow rate in the airway 411 is detected by arranging the measuring element 50 on the explosion vent pipe 41, so as to measure the impact load generated at the moment of thermal runaway of the battery cell 90, which is beneficial to carrying out the design and research work of the battery housing structure and improving the safety of using the power battery.

[0055] By designing the one-way valve 42 into the cover part 421, the extension part 422 and the hinge part 423, an embedding groove 415 is arranged on the explosion vent pipe 41. By embedding the extension part 422 into the embedding groove 415, it is ensured that the cover part 421 is in close fit with the end of the explosion vent pipe 41, and at the same time, it is ensured that the outside air cannot enter the airway 411 through the one-way valve 42, thereby improving the accuracy of measuring the energy impact load generated when the battery cell 90 undergoes thermal runaway and eliminating the influence of the external environment on the test.

[0056] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered that the scope described in this specification.

[0057] The above-described embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.

Claims

1. A detection box (100), characterized in that, Comprising: A housing (10), the housing (10) includes a box body (11) and a cover plate (12); a receiving cavity (111) is provided inside the box body (11), and the cover plate (12) seals the receiving cavity (111); A mounting rack (20), placed inside the receiving cavity (111), the mounting rack (20) is used to clamp and fix the battery cell (90) inside the receiving cavity (111); A heating element (30), provided inside the receiving cavity (111), the heating element (30) is used to attach to the outside of the battery cell (90) to provide heat to the battery cell (90); An explosion relief assembly (40), the explosion relief assembly (40) includes an explosion relief pipe (41) and a one-way valve (42); one end of the explosion relief pipe (41) is connected to the box body (11), an air passage (411) is provided inside the explosion relief pipe (41), and the air passage (411) communicates with the receiving cavity (111); the one-way valve (42) is provided on the side of the explosion relief pipe (41) away from the box body (11), and the one-way valve (42) seals the air passage (411); and A measuring member (50), connected to the explosion relief pipe (41), the measuring member (50) is used to measure the gas flow rate inside the air passage (411).

2. The detection box (100) according to claim 1, wherein The one-way valve (42) is hinged to the explosion relief pipe (41), and the one-way valve (42) rotates relative to the explosion relief pipe (41) to open or close the air passage (411); Wherein, when the one-way valve (42) rotates to the state of closing the air passage (411), the explosion relief pipe (41) abuts against the side of the one-way valve (42) close to the box body (11).

3. The detection box (100) according to claim 2, wherein, The one-way valve (42) includes a sealing portion (421), an extension portion (422) and a hinge portion (423); the sealing portion (421) is in a straight plate shape, and the sealing portion (421) seals the end of the explosion relief pipe (41) away from the box body (11); the extension portion (422) protrudes on the side of the sealing portion (421) close to the explosion relief pipe (41), and the extension portion (422) is in a long strip shape and extends along the rotation axis direction of the one-way valve (42) relative to the explosion relief pipe (41); the hinge portion (423) is in a cylindrical shape, and on the extension direction of the extension portion (422), the hinge portion (423) is oppositely arranged on both sides of the extension portion (422).

4. The detection box (100) according to claim 3, characterized in that, An embedding groove (415) is provided on the explosion relief pipe (41); the embedding groove (415) is provided at the end of the explosion relief pipe (41) away from the box body (11), and on the extension direction of the extension portion (422), hinge holes (416) are oppositely arranged on both sides of the embedding groove (415), the hinge holes (416) are in a circular groove shape, the extension portion (422) is correspondingly embedded in the embedding groove (415), and the hinge portion (423) is inserted into the hinge holes (416).

5. The detection box (100) according to claim 1, characterized in that, The housing (10) further includes a gasket (13); the gasket (13) is annular, the gasket (13) extends along the periphery of the cover plate (12), and the gasket (13) is clamped between the box body (11) and the cover plate (12).

6. The detection box (100) according to claim 1, wherein, The measuring member (50) is provided with an air inlet (51) and an air outlet (52); the air inlet (51) faces the side of the air duct (411) close to the box body (11), and the air outlet (52) faces the side of the air duct (411) close to the one-way valve (42).

7. The detection box (100) according to claim 1, characterized in that, The heating member (30) includes a heating part (31) and a wire part (32); the heating part (31) is in a straight plate shape, the number of the heating parts (31) is multiple, the heating part (31) is used for attaching to the outside of the battery cell (90), and the wire part (32) connects each heating part (31).

8. The detection box (100) according to claim 7, characterized in that, A wire passing hole (121) is provided on the cover plate (12), and the wire part passes through the wire passing hole (121); a plug block (125) is provided on the cover plate (12), the plug block (125) is arranged around the outside of the wire part, and the plug block (125) seals the wire passing hole (121).

9. The detection box (100) according to claim 1, characterized in that, The mounting bracket (20) includes a connecting rod (21) and a pressing plate (22); the connecting rod (21) is in a straight rod shape, and the pressing plates (22) are oppositely arranged at both ends of the connecting rod (21) to clamp and fix the battery cell (90) between the pressing plates (22) at both ends.

10. The detection box (100) according to claim 9, characterized in that, The pressing plate (22) is in a rectangular straight plate shape, and the connecting rods (21) are respectively arranged at the corner positions of the pressing plate (22).

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