Containing box, battery pack and electric equipment

Abstract

The utility model discloses a containing box, a battery pack and electric equipment, and the battery pack comprises a first shell, a second shell, a sealing piece and a rigid supporting piece; the first shell is provided with a first accommodating cavity, and the second shell is provided with a second accommodating cavity; the first shell is fixedly connected with the second shell, and the first accommodating cavity and the second accommodating cavity are communicated to form a storage cavity; the sealing piece and the rigid supporting piece are both arranged between the first shell and the second shell, the rigid supporting piece penetrates through the sealing piece, and the two opposite ends of the rigid supporting piece abut against the first shell and the second shell respectively. According to the invention, the rigid supporting member is additionally arranged between the first shell and the second shell, so that the first shell and the second shell are in contact with the rigid supporting member, and therefore, the sealing member only plays a sealing role, and the connection strength of the first shell and the second shell is not affected by the soft support of the sealing member.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a containment box, a battery pack, and an electrical device. Background Art

[0002] The sealing condition of the battery pack directly affects the service life of the power battery. To ensure the sealing of the battery pack, a flexible gasket is generally added between the upper housing and the lower housing of the battery pack. However, adding a flexible gasket will affect the connection strength between the upper housing and the lower housing of the battery pack, resulting in a soft connection between the upper housing and the lower housing. Thus, under vibration conditions, the connection strength between the upper housing and the lower housing is greatly affected. Summary of the Utility Model

[0003] The purpose of the present application is to provide a containment box, a battery pack, and an electrical device to solve the above problems. By adding a rigid support member, the connection strength between the upper housing and the lower housing of the battery pack is ensured.

[0004] The first aspect of the present application provides a containment box, including: a first housing, a second housing, a sealing member, and a rigid support member; the first housing is fixedly connected to the second housing; both the sealing member and the rigid support member are disposed between the first housing and the second housing, the rigid support member penetrates through the sealing member, and opposite ends of the rigid support member respectively abut against the first housing and the second housing.

[0005] In some embodiments, the rigid support member has a first thickness, the sealing member has a second thickness, and in the case where the sealing member is in a natural state, the first thickness is less than the second thickness.

[0006] In some embodiments, the sealing member has a standard compression amount, and the difference between the first thickness and the second thickness is greater than or equal to the standard compression amount.

[0007] In some embodiments, the sealing member is provided with a mounting hole, and the rigid support member is located in the mounting hole.

[0008] In some embodiments, the containment box further includes a fastener; the first housing has an opening, a first flanging is provided on a side of the first housing facing the second housing, the first flanging surrounds the opening of the first housing for one week, a second flanging is provided on a side of the second housing facing the first housing, the second flanging surrounds a week of the second housing close to the first housing; the first flanging and the second flanging are connected by the fastener; both the sealing member and the rigid support member are disposed between the first flanging and the second flanging.

[0009] In some embodiments, the fastener penetrates through the rigid support member.

[0010] In some embodiments, the rigid support is fixedly connected to the first housing.

[0011] In some embodiments, the rigid support is fixedly connected to the second housing.

[0012] In some embodiments, the rigid support is integrally formed with the first housing or the second housing.

[0013] A second aspect of the present application provides a battery pack, including the accommodation box and the battery cell described in any one of the above, the first housing is provided with a first accommodation cavity; the first accommodation cavity and the second housing form a storage cavity, and the battery cell is installed in the storage cavity.

[0014] A third aspect of the present application provides an electrical device, including the power battery described above or the battery pack described in any one of the above.

[0015] The battery pack provided by the present application includes a first housing, a second housing, a seal and a rigid support; the first housing is provided with a first accommodation cavity, and the second housing is provided with a second accommodation cavity; the first housing is fixedly connected to the second housing, and the first accommodation cavity and the second accommodation cavity communicate to form a storage cavity; the seal and the rigid support are both arranged between the first housing and the second housing, the rigid support penetrates through the seal, and opposite ends of the rigid support respectively abut against the first housing and the second housing. In the present application, by adding a rigid support between the first housing and the second housing, both the first housing and the second housing are in contact with the rigid support. In this way, the seal only plays a sealing role and will not affect the connection strength between the first housing and the second housing due to the soft support of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the present application, the drawings required for use in the embodiments will be briefly introduced below.

[0017] Figure 1 It is a schematic diagram of the overall structure of the battery pack provided by the embodiment of the present application.

[0018] Figure 2 It is an exploded view of the battery pack provided by the embodiment of the present application.

[0019] Figure 3 It is a schematic diagram of the structure of the first housing of the battery pack provided by the embodiment of the present application.

[0020] Figure 4 is Figure 3 The enlarged view at A in

[0021] Figure 5It is a schematic structural diagram of the second housing of the battery pack provided by an embodiment of the present application.

[0022] Figure 6 It is a schematic structural diagram of the gasket of the battery pack provided by an embodiment of the present application.

[0023] Figure 7 It is a schematic cross-sectional structural diagram of the battery pack provided by an embodiment of the present application.

[0024] Figure 8 It is Figure 7 An enlarged schematic diagram of part B of

[0025] Explanation of reference numerals: 100 - First housing; 110 - First flanging; 111 - First connecting section; 112 - First through hole; 120 - First accommodating cavity; 130 - First bottom plate; 140 - First side plate; 200 - Second housing; 210 - Second flanging; 211 - Second connecting section; 212 - Second through hole; 220 - Second accommodating cavity; 230 - Second bottom plate; 240 - Second side plate; 300 - Sealing member; 310 - Mounting hole; 320 - Sealing section; 400 - Rigid support member; 410 - Through hole; 500 - Fastening member; 510 - Bolt; 520 - Nut. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application.

[0027] Please refer to Figure 1 and Figure 2 The battery pack provided by the embodiment of the present application may include a containing box and battery cells (not shown in the figure), and includes a first housing 100, a second housing 200, a sealing member 300, and a rigid support member 400.

[0028] Referring to Figure 3 and Figure 4 The first housing 100 is provided with a first accommodating cavity 120. Specifically, the first housing 100 is in the shape of a rectangular frame with one side open. The first housing 100 includes a first bottom plate 130 and four first side plates 140. The first bottom plate 130 and the first side plates 140 are both in the shape of rectangular plates. The four first side plates 140 are respectively connected to the four outer peripheral edges of the first bottom plate 130, and the four first side plates 140 are connected end to end in sequence. The first bottom plate 130 and the four first side plates 140 enclose the first accommodating cavity 120. The opening of the first housing 100 is opposite to the first bottom plate 130, and the opening of the first housing 100 is also the opening of the first accommodating cavity 120.

[0029] The first housing 100 is provided with a first flanging 110, and the first flanging 110 surrounds the opening of the first accommodation cavity 120 of the first housing 100 for one week. Specifically, the first flanging 110 is in a rectangular ring shape. The first flanging 110 includes four first connection segments 111, and the four first connection segments 111 are connected end to end in sequence, and the four first connection segments 111 are respectively fixed to the sides of the four first side plates 140 away from the first bottom plate 130.

[0030] A plurality of first through holes 112 are formed in the first flanging 110, and the plurality of first through holes 112 can be distributed at equal intervals on the first flanging 110. Of course, they can also be arranged at unequal intervals. Specifically, those skilled in the art can design according to the actual situation, and the embodiments of the present application do not make specific regulations. It can be understood that the four first connection segments 111 are all provided with first through holes 112, or some of the first connection segments 111 are provided with first through holes 112. Generally, at least two non-adjacent first connection segments 111 should be provided with first through holes 112.

[0031] Continue to refer to Figure 3 and Figure 4 , the rigid support 400 is fixedly connected to the first housing 100. Specifically, the rigid support 400 protrudes from the first flanging 110. The rigid support 400 can be made of metal such as alloy, or can be made of non-metal material, as long as its rigidity is ensured. In short, the strength of the rigid support 400 should be greater than the strength of the seal 300. The number of the rigid supports 400 is multiple, and the multiple rigid supports 400 are arranged at intervals on the first flanging 110. Among them, each first connection segment 111 can be provided with one or more rigid supports 400. The number of the rigid supports 400 on each first connection segment 111 can be the same or different. It is also possible that some of the first connection segments 111 are provided with rigid supports 400, and the other part of the first connection segments 111 are not provided with rigid supports 400. For example, two first connection segments 111 are provided with rigid supports 400, and the other two first connection segments 111 are not provided with rigid supports 400. The rigid support 400 is in the shape of a cylindrical tube, a hexagon or a square, etc., and is provided with a through hole 410, and the through hole 410 penetrates the rigid support 400 along the axial direction of the rigid support 400; of course, the rigid support 400 can also be in other shapes, such as a prism, etc.

[0032] Those skilled in the art can understand that the rigid support member 400 can be fixed on the first flanging 110 by means of welding, riveting, etc. Of course, the rigid support member 400 can also be integrally formed with the first housing 100. Fixing the rigid support member 400 on the first housing 100 by welding can save costs, but welding deformation needs to be guarded against. Integrally forming the rigid support member 400 with the first housing 100 can prevent welding deformation, but the cost is relatively high. Specifically, those skilled in the art can consider comprehensively, and the embodiments of the present application do not make specific limitations. By fixing the rigid support member 400 on the first flanging 110, the positioning of the rigid support member 400 can be facilitated, thereby facilitating the installation of the first housing 100 and the second housing 200.

[0033] In other embodiments, the rigid support member 400 can also be arranged on the second housing 200. The way of arranging the rigid support member on the second housing 200 refers to the way of arranging it on the first housing 100, and will not be elaborated here.

[0034] Reference Figure 5 , the shape and size of the second housing 200 are the same as those of the first housing 100. The second housing 200 is provided with a second accommodation cavity 220. Specifically, the second housing 200 is in the shape of a rectangular frame with one side open. The second housing 200 includes a second bottom plate 230 and four second side plates 240. The second bottom plate 230 and the second side plates 240 are both in the shape of rectangular plates. The four second side plates 240 are respectively connected to the four outer peripheral edges of the second bottom plate 230, and the four second side plates 240 are connected end to end in sequence. The second bottom plate 230 and the four second side plates 240 enclose the second accommodation cavity 220. The opening of the second housing 200 is opposite to the second bottom plate 230. The opening of the second housing 200 is also the opening of the second accommodation cavity 220.

[0035] The second housing 200 is provided with a second flanging 210, and the second flanging 210 surrounds the opening of the second accommodation cavity 220 of the second housing 200 for one week. Specifically, the second flanging 210 is in the shape of a rectangular ring. The second flanging 210 includes four second connection segments 211, and the four second connection segments 211 are connected end to end in sequence. The four second connection segments 211 are respectively fixed on the sides of the four second side plates 240 away from the second bottom plate 230.

[0036] The second flanging 210 is provided with a plurality of second through holes 212, and the plurality of second through holes 212 can be distributed on the second flanging 210 at equal intervals or unequal intervals. It can be understood that the second through holes 212 can be provided on all four second connection segments 211, or can be provided on some of the second connection segments 211; but generally, the first through holes 112 and the second through holes 212 should be arranged in one-to-one correspondence.

[0037] It can also be understood that the second housing 200 can be a flat cover plate. At this time, the second flanging 210 is the periphery of the flat cover plate. At this time, the flat cover plate covers the opening of the first accommodation cavity 120, thus forming a storage cavity for installing the battery cell. At this time, the plurality of second through holes 212 opened on the second flanging 210 can refer to the opening manner of the second through holes 212 when the second housing 200 has the same structure as the first housing 100, and will not be elaborated here.

[0038] The following will take the case where the first housing 100 and the second housing 200 have the same structure as an example for illustration. Of course, when the second housing 200 is a flat cover plate, this illustration can also be referred to and will not be elaborated again.

[0039] Reference Figure 6 , the seal 300 is in a rectangular ring shape, and the seal 300 includes four seal segments 320 connected end to end in sequence. The seal 300 is provided with a mounting hole 310, and along the thickness direction of the seal 300, the mounting hole 310 penetrates through the seal 300. The number of the mounting holes 310 is single or multiple, and the multiple mounting holes 310 are arranged at intervals or continuously on the seal. It can be understood that the four seal segments 320 can all be provided with the mounting holes 310, or some of the seal segments 320 can be provided with the mounting holes. It can also be understood that after the seal 300 is compressed, an interference fit can be formed between the seal 300 and the rigid support 400.

[0040] Reference Figure 2 , the accommodating box further includes a fastener 500, and the fastener 500 can include a bolt 510 and a nut 520. Those skilled in the art can understand that the nut 520 can be welded to the first housing 100 in advance. Specifically, the nut 520 can be welded to the first flanging 110, and further, it can be welded at the first through hole 112. In other embodiments, the nut 520 can be welded to the second flanging 210, specifically, it can be welded at the second through hole 212. The number of the fasteners 500 is multiple, and it can be understood that the number of the fasteners 500 generally should be the same as the number of the first through holes 112 or the second through holes 212.

[0041] Reference Figure 7 and Figure 8 , the first housing 100 is fixedly connected to the second housing 200, and the first accommodation cavity 120 and the second accommodation cavity 220 communicate to form a storage cavity. The seal 300 and the rigid support 400 are both arranged between the first housing 100 and the second housing 200, the rigid support 400 penetrates through the seal 300, and the opposite ends of the rigid support 400 respectively abut against the first housing 100 and the second housing 200.

[0042] Specifically, the first flanging 110, the seal 300, and the second flanging 210 are stacked in sequence, that is, the seal 300 is located between the first flanging 110 and the second flanging 210. Among them, the four first connecting segments 111, the four sealing segments 320, and the four second connecting segments 211 are stacked in one-to-one correspondence, so that the first accommodating cavity 120 and the second accommodating cavity 220 communicate to form a storage cavity. The plurality of rigid support members 400 are respectively located in the plurality of mounting holes 310 in one-to-one correspondence, and one end of the rigid support member 400 is fixed to the first flanging 110, and the other end of the rigid support member 400 abuts against the second flanging 210, that is, the rigid support member 400 is located between the first flanging 110 and the second flanging 210, realizing that the opposite ends of the rigid support member 400 respectively abut against the first housing 100 and the second housing 200. The plurality of first through holes 112, the plurality of through holes 410, and the second through holes 212 are in one-to-one correspondence, and the first through hole 112, the through hole 410, and the second through hole 212 are sequentially communicated and coaxial. The bolt 510 is inserted through the first through hole 112, the through hole 410, and the second through hole 212, and is threadedly connected to the nut 520, thereby realizing the fixed connection of the first housing 100 and the second housing 200.

[0043] It can be understood that the width of the seal 300 can be equal to or slightly smaller than the width of the first flanging 110 or the second flanging 210. In this way, it can be ensured that after the seal 300 is installed and compressed, it will not extend into the storage cavity or extend outside the first flanging 110. In this embodiment, the width of the first flanging 110 or the second flanging 210 refers to the width of the first connecting segment 111 or the second connecting segment 211; and the width of the seal 300 refers to the width of the part that fits on the first connecting segment 111 or the second connecting segment 211.

[0044] In the embodiment of the present application, by adding the rigid support member 400 between the first housing 100 and the second housing 200, the first housing 100 and the second housing 200 are both in contact with the rigid support member 400. In this way, the seal 300 only plays a sealing role and will not affect the connection strength of the first housing 100 and the second housing 200 due to the soft support of the seal 300.

[0045] Those skilled in the art can also understand that both opposite ends of the rigid support member 400 are flat surfaces, thereby increasing the contact area between the rigid support member 400 and the first housing 100 and the second housing 200, and increasing the connection stability of the first housing 100 and the second housing 200. The seal 300 can be a sealing foam or other sealing materials, such as a rubber pad. The shape of the cross-section of the rigid support member 400 perpendicular to the axial direction can be cylindrical or other shapes, such as hexagonal or square.

[0046] Figure 8The rigid support member 400 and the fastener 500 are coaxial. Of course, the rigid support member 400 and the fastener 500 may not be coaxial, and the fastener 500 passes through the rigid support member 400. That is, in the embodiment of the present application, the bolt 510 passes through the rigid support member 400. By setting it in this way, it is convenient for the bolt 510 to penetrate and position, and it is convenient for the rigid support member 400 to position. It can be understood that the number of rigid support members 400 can be the same as the number of fasteners 500. In other embodiments, the number of rigid support members 400 can also be less than the fasteners 500, that is, some fasteners 500 match the rigid support member 400 to achieve rigid support between the first shell 100 and the second shell 200, and the other part of the fasteners 500 do not match the rigid support member 400, so that the first shell 100 and the second shell 200 can be reliably connected.

[0047] In other embodiments, the rigid support member 400 may also be staggered with the fastener 500. That is, the fastener 500 may pass through the rigid support member 400 between the first flange 110 and the second flange 210, or may not pass through the rigid support member 400 between the first flange 110 and the second flange 210.

[0048] Figure 8 The fastening method of the fastener 500 described in the specification is that the bolt 510 passes through the second flange 210, the rigid support member 400, the first flange 110 in sequence, and extends out of the first flange 110, and then the nut 520 is screwed into the end of the bolt 510 extending out of the first flange 110, and then tightened.

[0049] Please continue to refer to Figure 8 In some embodiments, the rigid support member 400 has a first thickness, and the seal member 300 has a second thickness. When the seal member 300 is in a natural state, the first thickness is less than the second thickness. It can be understood by those skilled in the art that, in the embodiment of the present application, the thickness refers to the dimension from the first shell 100 to the second shell 200, and the second thickness of the seal member 300 refers to the thickness of the seal member 300 in a natural state. As is known to all, the sealing of the seal member 300 depends on the compression of the seal member 300. In the embodiment of the present application, the thickness of the seal member 300 in a natural state is greater than the thickness of the rigid support member 400. In this way, when the first shell 100 and the second shell 200 are fixedly connected, the first shell 100 and the second shell 200 squeeze the seal member 300, so that the seal member 300 is compressed, thereby ensuring the sealing of the storage cavity, preventing water vapor from entering the storage cavity, thereby preventing the battery cell in the storage cavity from short-circuiting due to water vapor, and ensuring the safety of the battery cell in the storage cavity.

[0050] In some embodiments, the seal 300 has a standard compression amount, and the difference between the first thickness and the second thickness is greater than or equal to the standard compression amount. Those skilled in the art can understand that since the opposite ends of the rigid support 400 respectively press against the first housing 100 and the second housing 200, the difference between the first thickness and the second thickness is also the compression amount of the seal 300. Therefore, in order to ensure the sealing effect of the seal 300, during the fastening process of the first housing 100 and the second housing 200, the compression amount of the seal 300 should be greater than or equal to the standard compression amount of the seal 300, that is, the difference between the first thickness and the second thickness should be greater than or equal to the standard compression amount of the seal 300. In this way, it can be ensured that no moisture enters the storage cavity, thereby ensuring the safe use of the battery cells in the storage cavity.

[0051] In the embodiments of the present application, during the process of fastening the first housing 100 and the second housing 200 by the fastener 500, the seal 300 will be compressed until the opposite ends of the rigid support 400 respectively abut against the first housing 100 and the second housing 200. At this time, the compression amount of the seal 300 is greater than or equal to the standard compression amount of the seal 300, so that the sealing effect of the seal 300 can be ensured. And the first housing 100 and the second housing 200 respectively abut against the opposite ends of the rigid support 400. In this way, a rigid connection is formed between the first housing 100, the rigid support 400 and the second housing 200, avoiding soft connection, so as to ensure the connection strength between the first housing 100 and the second housing 200 under vibration conditions, and ensure the service life and safe use of the battery pack.

[0052] Next, vibration tests will be carried out on the battery packs with and without the rigid support 400. The specific test method can refer to the vibration test standard in 6.4.2.3 of GB43854—2024, Safety Technical Specification for Lithium-Ion Batteries for Electric Bicycles. After the test, compare the torque before and after vibration.

[0053] As shown in Table 1, it is the vibration test results of the battery pack without the rigid support 400.

[0054] Table 1

[0055] Bolt 510 Torque before vibration test N·m Torque after vibration test N·m 1 8.12 3.52 2 8.21 4.67 3 8.09 4.50 4 8.10 5.17 5 8.16 3.26 6 8.20 3.86 7 8.18 3.48 8 8.15 4.78 9 8.19 4.24 10 8.11 3.79

[0056] As shown in Table 2, it is the vibration test results of the battery pack with the rigid support 400:

[0057] Table 2

[0058] Bolt 510 Torque before vibration test N·m Torque after vibration test N·m 1 8.15 7.23 2 8.18 7.19 3 8.20 6.98 4 8.13 7.32 5 8.18 7.45 6 8.16 7.28 7 8.10 7.15 8 8.24 7.26 9 8.19 7.36 10 8.23 7.11

[0059] As shown in Table 1, only a seal 300 is provided between the first housing 100 and the second housing 200 of the battery pack, and no rigid support 400 is provided. After the first housing 100 and the second housing 200 are fixed, torque measurement is performed. After vibration shock, torque measurement is performed again, and it is found that the torque has severely decayed, and the most severe decay exceeds 50%. This will inevitably cause poor airtightness of the entire pack and pose a safety hazard.

[0060] As shown in Table 2, not only a seal 300 is provided between the first housing 100 and the second housing 200 of the battery pack, but also a rigid support 400 is provided. After the first housing 100 and the second housing 200 are fixed, torque measurement is performed. After vibration shock, torque measurement is performed again, and it is found that the torque decay is relatively small, and the torque decay does not exceed 15%. Obviously, adding or reducing the rigid support 400 between the first housing 100 and the second housing 200 can greatly reduce the torque decay and increase the use safety of the battery pack.

[0061] From the above test results, those skilled in the art can know that when the battery cells in the battery pack are strongly electrically connected and the first housing 100 and the second housing 200 are connected by fasteners 500; when no rigid support 400 is used between the first housing 100 and the second housing 200, during the use of the battery pack, due to the decay of the torque, the strong electrical connection will be unreliable, there will be loosening, the contact resistance will increase, the temperature rise will increase, and there is a risk of fire in the battery pack; during the vibration of the first housing 100 and the second housing 200, it will also cause poor airtightness of the entire pack and there is a risk of water ingress and short circuit in the battery pack.

[0062] By adopting the technical solution provided by the present application, since there is a rigid support 400 between the first housing 100 and the second housing 200, therefore, the decay of the torque of the first housing 100 and the second housing 200 during vibration can be slowed down, thereby ensuring the extension of the service life of the battery pack and the improvement of safety.

[0063] The present application also provides an embodiment of an electrical device. In this embodiment, the electrical device includes the above-mentioned power battery or the battery pack described in any one of the above. Since the electrical device uses the above-mentioned power battery or the above-mentioned battery pack, therefore, the electrical device also has the technical effects of the above-mentioned battery pack. The electrical device can be a vehicle or an energy storage system, etc.

[0064] The above has introduced the embodiments of the present application in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application.

Claims

1. A container, characterized in that: include: A first shell, a second shell, a seal and a rigid support; The first shell is fixedly connected to the second shell; The sealing member and the rigid support member are both arranged between the first shell and the second shell, the rigid support member penetrates the sealing member, and opposite ends of the rigid support member abut against the first shell and the second shell respectively.

2. The storage box according to claim 1, characterized in that: The rigid support has a first thickness and the sealing member has a second thickness, and when the sealing member is in a natural state, the first thickness is less than the second thickness.

3. The storage box according to claim 2, characterized in that: The seal has a standard compression amount, and the difference between the first thickness and the second thickness is greater than or equal to the standard compression amount.

4. The storage box according to any one of claims 1 to 3, characterized in that: The sealing component is provided with a mounting hole, and the rigid supporting component is located in the mounting hole.

5. The storage box according to any one of claims 1 to 3, characterized in that: The storage box further includes a fastener; the first shell has an opening, a first flange is provided on a side of the first shell facing the second shell, and the first flange surrounds the opening of the first shell; the second shell has a second flange on a side facing the first shell, and the second flange surrounds a side of the second shell close to the first shell; The first flange and the second flange are connected by the fastener; the sealing member and the rigid support member are both arranged between the first flange and the second flange.

6. The storage box according to claim 5, characterized in that: The fastener extends through the rigid support.

7. The storage box according to any one of claims 1 to 3, characterized in that: The rigid support member is fixedly connected to the first shell or the second shell.

8. The storage box according to any one of claims 1 to 3, characterized in that: The rigid support member is integrally formed with the first shell or the second shell.

9. A battery pack, characterized in that: It comprises a battery cell and the storage box as claimed in any one of claims 1 to 8; the first shell is provided with a first storage cavity; the first storage cavity and the second shell form a storage cavity; the battery cell is arranged inside the storage cavity.

10. An electrical device, characterized in that: A battery pack comprising the battery pack of claim 9.

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