Battery cell

Abstract

The invention discloses a battery monomer, and belongs to the technical field of batteries, the battery monomer comprises a battery cell assembly, the battery cell assembly comprises a stacked core body, a first tab and a second tab, the first tab and the second tab are respectively arranged at one end of the stacked core body in a first direction, and the first tab and the second tab are arranged at an interval in a second direction; the first tab is provided with a first end connected with the laminated core body, the second tab is provided with a second end connected with the laminated core body, and the distance D between the first end and the second end is greater than or equal to 5mm and less than or equal to 20mm in the second direction; and in the second direction, the width of the first end is a, the width of the second end is b, the width of the laminated core body is T, and a / T is greater than or equal to 0.35 and less than or equal to 0.48, and / or b / T is greater than or equal to 0.35 and less than or equal to 0.48. According to the invention, the overcurrent area of the first tab and the second tab is increased, the internal resistance of the joints of the first tab, the second tab and the stack core body is reduced, and the charging and discharging energy efficiency of the battery monomer is improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a battery cell. Background Art

[0002] At present, in batteries where the positive and negative poles are located on the same side, the positive and negative poles and explosion-proof valves are usually integrated on the same cover. In order to reserve enough airways for the explosion-proof valve to open normally, the battery cell tabs in the battery need to avoid the explosion-proof valve and connect to the poles, which limits the size of the tabs themselves and affects the battery charging and discharging efficiency. Summary of the invention

[0003] Purpose of this application: The embodiment of this application provides a battery cell, aiming to overcome the above-mentioned technical problems.

[0004] Technical solution: A battery cell according to an embodiment of the present application includes:

[0005] A battery cell assembly, comprising a stacked core body, a first pole ear and a second pole ear, wherein the first pole ear and the second pole ear are respectively arranged at one end of the stacked core body in a first direction, and the first pole ear and the second pole ear are spaced apart in a second direction, the first direction is the length direction of the stacked core body, and the second direction is the width direction of the stacked core body;

[0006] The first pole tab has a first end connected to the stacked core body, the second pole tab has a second end connected to the stacked core body, and in the second direction, a distance D between the first end and the second end satisfies: 5 mm ≤ D ≤ 20 mm;

[0007] In the second direction, the width of the first end is a, the width of the second end is b, and the width of the stacked core body is T, satisfying: 0.35≤a / T≤0.48;

[0008] And / or, 0.35≤b / T≤0.48.

[0009] In some embodiments, in the first direction, the first pole tab has a third end disposed opposite to the first end, and the second pole tab has a fourth end disposed opposite to the second end;

[0010] In the second direction, the width of the third end is not greater than the width of the first end;

[0011] And / or, in the second direction, the width of the fourth end is not greater than the width of the second end.

[0012] In some embodiments, in the second direction, the width of the first tab decreases from the first end to the third end;

[0013] And / or, in the second direction, the width of the second pole tab decreases from the second end to the fourth end.

[0014] In some embodiments, in a plane perpendicular to the first direction, the orthographic projection of the third end is located within the orthographic projection of the first end;

[0015] And / or, in a plane perpendicular to the first direction, the orthographic projection of the fourth end is located within the orthographic projection of the second end.

[0016] In some embodiments, in the second direction, the width of the third end is c, the width of the fourth end is d, and the following conditions are satisfied: 0.34≤c / T≤0.47;

[0017] And / or, 0.34≤d / T≤0.47.

[0018] In some embodiments, in the first direction, the length of the first pole tab is e, satisfying: 1.5≤a / e≤2;

[0019] And / or, in the first direction, the length of the second pole tab is f, satisfying: 1.5≤b / f≤2.

[0020] In some embodiments, the battery cell further comprises:

[0021] The cover assembly comprises a cover plate, a first pole and a second pole, wherein the first pole and the second pole are respectively arranged through the cover plate, and the first pole is connected to the first pole lug, and the second pole is connected to the second pole lug.

[0022] In some embodiments, the battery cell assembly is provided in plurality, and the first pole tabs of the plurality of battery cell assemblies are respectively connected to the first pole column, and the second pole tabs of the plurality of battery cell assemblies are respectively connected to the second pole column.

[0023] In some embodiments, the battery cell further comprises:

[0024] A shell, the battery cell assembly is arranged in the shell, and the cover plate is arranged on the shell;

[0025] The explosion-proof component is arranged on the shell.

[0026] In some embodiments, the shell has a bottom wall, the bottom wall and the cover plate are arranged in the first direction, and the explosion-proof component is arranged on the bottom wall.

[0027] Beneficial effect: The battery cell of the embodiment of the present application includes a battery cell assembly. The battery cell assembly includes a stacked core body, a first pole ear and a second pole ear. The first pole ear and the second pole ear are respectively arranged at one end of the stacked core body in the first direction, and the first pole ear and the second pole ear are spaced apart in the second direction. The first direction is the length direction of the stacked core body, and the second direction is the width direction of the stacked core body. The first pole ear has a first end connected to the stacked core body, and the second pole ear has a second end connected to the stacked core body. In the second direction, the width of the first end is a, the width of the second end is b, the width of the stacked core body is T, and the spacing between the first end and the second end is D, which satisfies: 5mm≤D≤20mm; and satisfies: 0.35≤a / T≤0.48; and / or, 0.35≤b / T≤0.48. The width of the first end and / or the second end is set to account for 0.35 to 0.48 of the width of the stacked core body, and the spacing between the first end and the second end is set within 20 mm, that is, by reducing the spacing between the first pole ear and the second pole ear and increasing the size of the first pole ear and the second pole ear, the flow area of ​​the first pole ear and the second pole ear is increased, and the internal resistance of the battery cell assembly at the connection between the first pole ear, the second pole ear and the stacked core body is reduced, which is beneficial to improving the charging and discharging energy efficiency of the battery cell. At the same time, the spacing between the first end and the second end is ensured to be not less than 5 mm, reducing the risk of short-circuiting between the first pole ear and the second pole ear, and improving the safety of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 A schematic diagram of the structure of a battery cell assembly provided in an embodiment of the present application;

[0030] Figure 2 A schematic diagram of the structure of the cover assembly provided in an embodiment of the present application;

[0031] Figure 3 A schematic diagram of a structure in which a first electrode tab is connected to a first electrode column and a second electrode tab is connected to a second electrode column provided in an embodiment of the present application;

[0032] Figure 4 A schematic diagram of the structure of the housing and explosion-proof components provided in the embodiment of the present application;

[0033] Figure numerals: 1, battery cell assembly; 10, stacked core body; 11, first pole ear; 110, first end; 111, third end; 12, second pole ear; 120, second end; 121, fourth end; 13, weld mark; 2, shell; 20, bottom wall; 3, cover body assembly; 30, cover plate; 300, injection hole; 31, first pole; 32, second pole; 4, explosion-proof part; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0035] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "plurality" means two or more, and at least one means one, two or more, unless otherwise clearly and specifically defined.

[0036] At present, battery cells usually integrate components such as positive and negative poles and explosion-proof valves on the same cover. In addition, in order to monitor the working status of the battery cell in real time, other monitoring components may also be integrated on the cover. In order to reserve enough airways for the explosion-proof valve to open normally, the battery cell ears in the battery cell need to avoid the explosion-proof valve and connect the poles. At the same time, sufficient assembly space needs to be reserved for other components. The spacing between the positive and negative pole ears is mostly more than 30mm. Combining the above factors, the size of the pole ears themselves is also limited, affecting the charging and discharging efficiency of the battery cell.

[0037] In view of this, refer to Figures 1 to 4 , an embodiment of the present application provides a battery cell to overcome at least one of the above-mentioned technical problems.

[0038] Reference Figures 1 to 4 A battery cell includes a battery cell assembly 1. The battery cell assembly 1 includes a stacked core body 10, a first pole tab 11 and a second pole tab 12.

[0039] It should be noted that the following embodiments introduce an intersecting first direction X and second direction Y. The plane defined by the first direction X and the second direction Y is parallel to the large surface of the stacked core body 10, and it can also be understood that the first direction X is the length direction of the stacked core body 10, and the second direction Y is the width direction of the stacked core body 10.

[0040] The first pole tab 11 and the second pole tab 12 are respectively arranged at one end of the stacked core body 10 in the first direction X, and the first pole tab 11 and the second pole tab 12 are spaced apart in the second direction Y. The first pole tab 11 has a first end 110 connected to the stacked core body 10, and the second pole tab 12 has a second end 120 connected to the stacked core body 10. In the second direction Y, the width of the first end 110 is a, the width of the second end 120 is b, the width of the stacked core body 10 is T, and the distance between the first end 110 and the second end 120 is D, which satisfies: 5mm≤D≤20mm;

[0041] And the following conditions are satisfied: 0.35≤a / T≤0.48; and / or, 0.35≤b / T≤0.48.

[0042] In this embodiment, 0.35≤a / T≤0.48 and 0.35≤b / T≤0.48 are taken as an example. In other embodiments, only 0.35≤a / T≤0.48 or only 0.35≤b / T≤0.48 may be satisfied, which will not be repeated here.

[0043] D can be any one of 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, and 20mm, or a range value consisting of any two of them.

[0044] By setting D to be no less than 5 mm, it is beneficial to reduce the risk of short-circuiting between the first pole lug 11 and the second pole lug 12 while ensuring that a larger width expansion space is provided for the first pole lug 11 and the second pole lug 12, thereby improving the safety of the battery cell.

[0045] a / T can be any one of 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, and 0.48, or a range of any two of them.

[0046] b / T can be any one of 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, and 0.48, or a range of any two of them.

[0047] The width of the first end 110 and the second end 120 is set to account for 0.35 to 0.48 of the width of the stacked core body 10, and the spacing between the first end 110 and the second end 120 is set within 20 mm. By reducing the spacing between the first pole ear 11 and the second pole ear 12 and increasing the size of the first pole ear 11 and the second pole ear 12, the flow area of ​​the first pole ear 11 and the second pole ear 12 is increased, and the internal resistance of the battery cell assembly 1 at the connection between the first pole ear 11, the second pole ear 12 and the stacked core body 10 is reduced, which is beneficial to improving the charging and discharging energy efficiency of the battery cell.

[0048] In some embodiments, reference Figures 1 to 3 In the first direction X, the first electrode tab 11 has a third end 111 disposed opposite to the first end 110 , and the second electrode tab 12 has a fourth end 121 disposed opposite to the second end 120 .

[0049] In the second direction Y, the width of the third end 111 is not greater than the width of the first end 110;

[0050] And / or, in the second direction Y, the width of the fourth end 121 is not greater than the width of the second end 120 .

[0051] It should be noted that, in this embodiment, the first pole tab 11 and the second pole tab 12 are of the same shape and size as an example, in the second direction Y, the width of the third end 111 is not greater than the width of the first end 110, and the width of the fourth end 121 is not greater than the width of the second end 120. This is conducive to reducing the width of the third end 111 and the width of the fourth end 121 being too large, resulting in exceeding the coverage range of the pole, and thus easily causing the first pole tab 11 and the second pole tab 12 to short-circuit and connect the cover plate 30 and other problems.

[0052] It can be understood that, in the second direction Y, the width of the first end 110 and the width of the third end 111 can be equal, and similarly, the width of the second end 120 and the width of the fourth end 121 can be equal. Structurally, the first pole tab 11 and the second pole tab 12 can be structural members with large surfaces such as rectangles, parallelograms, etc. In some embodiments, in the second direction Y, the width of the first end 110 can be greater than the width of the third end 111, and similarly, the width of the second end 120 can be greater than the width of the fourth end 121.

[0053] In other embodiments, when the pole coverage range corresponding to the first pole tab 11 and the second pole tab 12 is sufficient, it is also possible to satisfy that the width of the third end 111 is not greater than the width of the first end 110 in the second direction Y. Or it is also possible to satisfy that the width of the fourth end 121 is not greater than the width of the second end 120 in the second direction Y, which will not be repeated here.

[0054] In some embodiments, reference Figure 1, in the second direction Y, the width of the first electrode tab 11 decreases from the first end 110 to the third end 111;

[0055] And / or, in the second direction Y, the width of the second electrode tab 12 decreases from the second end 120 to the fourth end 121 .

[0056] In this embodiment, in the second direction Y, the width of the first pole tab 11 decreases from the first end 110 to the third end 111, and the width of the second pole tab 12 decreases from the second end 120 to the fourth end 121. The width of the first end 110 of the first pole tab 11 is greater than the width of the third end 111, and the width of the second end 120 of the second pole tab 12 is greater than the width of the fourth end 121. If a structure member with a large surface of the first pole tab 11 and the second pole tab 12 is adopted, when welding the first pole tab 11 and the second pole tab 12 to the corresponding pole, the first pole tab 11 and the second pole tab 12 can rely on the structure that is wider at the end close to the stacked core body 10 relative to the end close to the corresponding pole, thereby tightening the large surface of the first pole tab 11 and the second pole tab 12, reducing the problem of curling and wrinkling of the first pole tab 11 and the second pole tab 12 during welding, thereby improving the stability of the process of connecting the first pole tab 11 and the second pole tab 12 to the pole, and improving the quality rate of the battery cell.

[0057] In some embodiments, reference Figure 1 and Figure 2 , in a plane perpendicular to the first direction X, the orthographic projection of the third end 111 is located within the orthographic projection of the first end 110;

[0058] And / or, in a plane perpendicular to the first direction X, the orthographic projection of the fourth end 121 is located within the orthographic projection of the second end 120 .

[0059] In this embodiment, it is taken as an example that in a plane perpendicular to the first direction X, the orthographic projection of the third end 111 is located within the orthographic projection of the first end 110, and the orthographic projection of the fourth end 121 is located within the orthographic projection of the second end 120. Specifically, in this embodiment, the large surfaces of the first pole tab 11 and the second pole tab 12 are both isosceles trapezoidal, which is not only convenient for measurement, calibration, and manufacturing, but also ensures the stability of the first pole tab 11 and the second pole tab 12 before connecting the poles.

[0060] In some embodiments, reference Figure 1 , in the second direction Y, the width of the third end 111 is c, and the width of the fourth end 121 is d, satisfying: 0.34≤c / T≤0.47;

[0061] And / or, 0.34≤d / T≤0.47.

[0062] In this embodiment, 0.34≤c / T≤0.47 and 0.34≤d / T≤0.47 are taken as an example. In other embodiments, only 0.34≤c / T≤0.47 or only 0.34≤d / T≤0.47 may be satisfied, which will not be repeated here.

[0063] c / T can be any one of 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, and 0.47, or a range of any two of them.

[0064] d / T may be any one of 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, and 0.47, or a range of any two of them.

[0065] The width of the third end 111 and the fourth end 121 in the second direction Y is also set to account for 0.34 to 0.47 of the width of the stacked core body 10, which is conducive to ensuring that the first pole ear 11, the second pole ear 12 have a larger contact area during the connection process with the corresponding pole, thereby ensuring the flow area of ​​the first pole ear 11, the second pole ear 12 and the corresponding pole connection end, reducing the internal resistance of the connection between the first pole ear 11, the second pole ear 12 and the corresponding pole, which is conducive to reducing the temperature rise at the pole during the use of the battery cell, improving the safety of the battery cell, and at the same time improving the charging and discharging energy efficiency of the battery cell.

[0066] In some embodiments, reference Figure 1 , in the first direction X, the length of the first pole ear 11 is e, satisfying: 1.5≤a / e≤2;

[0067] And / or, in the first direction X, the length of the second electrode tab 12 is f, satisfying: 1.5≤b / f≤2.

[0068] In this embodiment, 1.5≤a / e≤2 and 1.5≤b / f≤2 are taken as an example. In other embodiments, only 1.5≤a / e≤2 or only 1.5≤b / f≤2 may be satisfied, which will not be repeated here.

[0069] It is beneficial to ensure that the first pole lug 11 and the second pole lug 12 have good manufacturability, that is, to avoid the first pole lug 11 and the second pole lug 12 having an excessively large or small length-to-width ratio, which increases the difficulty of manufacturing. At the same time, as the width of the first pole lug 11 and the second pole lug 12 in the second direction Y increases, the length of the first pole lug 11 and the second pole lug 12 in the first direction X also increases in proportion. At this time, the first pole lug 11, the second pole lug 12 and the corresponding pole can be directly welded without using an adapter. Reduce the internal resistance of the connection end of the first pole lug 11, the second pole lug 12 and the corresponding pole, reduce the cost of the battery cell, improve the energy efficiency of charging and discharging, reduce the temperature rise at the pole during the use of the battery cell, and improve the safety of the battery cell.

[0070] Specifically, in some embodiments, referring to Figures 1 to 3 The battery cell further includes a cover assembly 3. The cover assembly 3 includes a cover plate 30, a first pole 31 and a second pole 32. The first pole 31 and the second pole 32 are respectively disposed on the cover plate 30, and the first pole 31 is connected to the first pole lug 11, and the second pole 32 is connected to the second pole lug 12.

[0071] In some embodiments, reference Figure 2 The battery cell assembly 1 is provided with a plurality of first pole ears 11 of the plurality of battery cell assemblies 1 are respectively connected to the first pole column 31 , and the second pole ears 12 of the plurality of battery cell assemblies 1 are respectively connected to the second pole column 32 .

[0072] In this embodiment Figure 2 Two battery cell assemblies 1 are shown connected to the same cover plate 30 assembly. Figure 2 The state is that the large surface of the first pole lug 11 and the second pole lug 12 are parallel to the end surface of the corresponding first pole column 31 and the second pole column 32. At this time, the first pole lug 11 and the first pole column 31, the second pole lug 12 and the second pole column 32 are directly welded to form a Figure 2 The weld mark 13 is shown. Subsequently, the two battery core assemblies 1 need to be rotated relative to each other (not shown in the figure) so as to be loaded into the housing of the battery cell.

[0073] In addition, it should be noted that after sufficient space is ensured on the cover plate 30 for assembling the first pole 31, the second pole 32, the first pole lug 11 and the second pole lug 12, Figure 3 As shown, the cover plate 30 may be provided with a liquid injection hole 300. In other embodiments, the liquid injection hole 300 may also be provided on the housing 2, which will not be described in detail herein.

[0074] In some embodiments, reference Figure 3 and Figure 4The battery cell further includes a housing 2 and an explosion-proof component 4. The battery cell assembly 1 is disposed in the housing 2, and the explosion-proof component 4 is disposed in the housing 2. That is, by assembling the explosion-proof component 4 to the housing 2, it is avoided that the explosion-proof component 4 is disposed on the cover plate 30 to limit the dimensions of the first pole 31, the second pole 32, and the first pole lug 11, and the second pole 32 in the second direction Y.

[0075] Specifically, in some embodiments, referring to Figure 4 The housing 2 has a bottom wall 20, the bottom wall 20 and the cover plate 30 are arranged in the first direction X, and the explosion-proof component 4 is arranged on the bottom wall 20. That is, the explosion-proof component 4 is arranged on the side away from the first pole 31 and the second pole 32. When the battery cells are assembled into a group, the explosion-proof component 4 is opposite to other electrical connection structures on the side of the first pole 31 and the second pole 32, so as to achieve thermal and electrical separation, which is beneficial to improve the safety of the battery cells.

[0076] The battery cells provided in the embodiments of the present application are introduced in detail above, and the principles and implementation methods of the present application are explained by using specific examples. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, characterized in that: include: A battery cell assembly (1), comprising a stacked core body (10), a first pole lug (11) and a second pole lug (12), wherein the first pole lug (11) and the second pole lug (12) are respectively arranged at one end of the stacked core body (10) in a first direction (X), and the first pole lug (11) and the second pole lug (12) are arranged at intervals in a second direction (Y), wherein the first direction (X) is the length direction of the stacked core body (10), and the second direction (Y) is the width direction of the stacked core body (10); The first pole tab (11) has a first end (110) connected to the stacked core body (10), and the second pole tab (12) has a second end (120) connected to the stacked core body (10). In the second direction (Y), the distance between the first end (110) and the second end (120) is D, which satisfies: 5 mm ≤ D ≤ 20 mm. In the second direction (Y), the width of the first end (110) is a, the width of the second end (120) is b, and the width of the stacked core body (10) is T, satisfying: 0.35≤a / T≤0.48; And / or, 0.35≤b / T≤0.

48.

2. The battery cell according to claim 1, characterized in that: In the first direction (X), the first pole lug (11) has a third end (111) arranged opposite to the first end (110), and the second pole lug (12) has a fourth end (121) arranged opposite to the second end (120); In the second direction (Y), the width of the third end (111) is not greater than the width of the first end (110); And / or, in the second direction (Y), the width of the fourth end (121) is not greater than the width of the second end (120).

3. The battery cell according to claim 2, characterized in that: In the second direction (Y), the width of the first electrode tab (11) decreases from the first end (110) to the third end (111); And / or, in the second direction (Y), the width of the second pole tab (12) decreases from the second end (120) to the fourth end (121).

4. The battery cell according to claim 3, characterized in that: In a plane perpendicular to the first direction (X), the orthographic projection of the third end (111) is located within the orthographic projection of the first end (110); And / or, in a plane perpendicular to the first direction (X), the orthographic projection of the fourth end (121) is located within the orthographic projection of the second end (120).

5. The battery cell according to claim 2, characterized in that: In the second direction (Y), the width of the third end (111) is c, and the width of the fourth end (121) is d, satisfying: 0.34≤c / T≤0.47; And / or, 0.34≤d / T≤0.

47.

6. The battery cell according to claim 1, characterized in that: In the first direction (X), the length of the first pole tab (11) is e, satisfying: 1.5≤a / e≤2; And / or, in the first direction (X), the length of the second pole tab (12) is f, satisfying: 1.5≤b / f≤2.

7. The battery cell according to any one of claims 1 to 6, characterized in that: The battery cell further comprises: The cover assembly (3) comprises a cover plate (30), a first pole (31) and a second pole (32), wherein the first pole (31) and the second pole (32) are respectively inserted through the cover plate (30), and the first pole (31) is connected to the first pole lug (11), and the second pole (32) is connected to the second pole lug (12).

8. The battery cell according to claim 7, characterized in that: The battery cell assembly (1) is provided in plurality, and the first pole lugs (11) of the plurality of battery cell assemblies (1) are respectively connected to the first pole column (31), and the second pole lugs (12) of the plurality of battery cell assemblies (1) are respectively connected to the second pole column (32).

9. The battery cell according to claim 7, characterized in that: The battery cell further comprises: A shell (2), the battery cell assembly (1) is arranged in the shell (2), and the cover plate (30) is covered on the shell (2); An explosion-proof component (4) is arranged on the housing (2).

10. The battery cell according to claim 9, characterized in that: The housing (2) has a bottom wall (20), the bottom wall (20) and the cover plate (30) are arranged in the first direction (X), and the explosion-proof component (4) is arranged on the bottom wall (20).

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