Battery pack

Abstract

The utility model discloses a battery pack. The connecting piece of the battery pack comprises a main body part and a connecting part, the main body part extends in the first direction and is contained in a second containing cavity in the frame. The connecting part extends in the second direction, and the connecting part extends into the first containing cavity to be electrically connected with the switching assembly. In other words, most of the connecting pieces are located in the second containing cavities in the frame, the situation that the connecting pieces additionally occupy the space of the first containing cavities used for containing the single batteries can be avoided as much as possible, and therefore the utilization rate of the space in the battery pack can be improved, and the energy density of the battery pack can be improved. And moreover, the connecting piece does not occupy the space of the first accommodating cavity additionally, so that the problem that elements such as the single batteries are difficult to assemble can be avoided as far as possible, and the assembly efficiency of the battery pack is improved.

Description

Technical Field

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

[0002] As an energy storage device, the battery pack is the core component of hybrid vehicles and electric vehicles. The battery pack is mainly composed of a box, a battery module and a copper busbar. The battery module is placed inside the box of the battery pack, and the battery module is composed of several single cells connected in series and parallel. The copper busbar leads the power of the battery module to the external power device through the power plug-in, that is, supplies power to the external power device.

[0003] However, the copper busbars that connect the power plug-in in the current battery packs occupy the space inside the box for accommodating the single battery, resulting in a reduced space utilization inside the battery pack, which is not conducive to improving the energy density of the battery pack. In addition, since the copper busbars occupy extra space, the space inside the battery pack is too small, which easily leads to difficulties in assembling components such as single batteries. Utility Model Content

[0004] The present application provides a battery pack, which is beneficial to improving the assembly efficiency of the battery pack and improving the energy density of the battery pack.

[0005] The present application provides a battery pack, which has a first direction and a second direction perpendicular to each other, and comprises: a box body, comprising a base and a frame arranged on the base, the frame and the base enclose a first accommodating cavity, wherein the frame has a second accommodating cavity inside; a single battery, accommodated in the first accommodating cavity; an electrical component, accommodated in the first accommodating cavity; a first plug-in, connected to the frame, the first plug-in and the electrical component are arranged at intervals along the second direction; a connector, comprising a main body and a connecting part; the main body extends along the first direction, the main body is accommodated in the second accommodating cavity, and the main body is electrically connected to the first plug-in; the connecting part extends along the second direction, and the connecting part extends into the first accommodating cavity; and an adapter component, accommodated in the first accommodating cavity, and the adapter component is electrically connected to the electrical component and the connecting part respectively.

[0006] In an embodiment of the present application, the connecting portion is connected to one end of the main body in the first direction, and the first plug-in is connected to the other end of the main body in the first direction.

[0007] In one embodiment of the present application, a first opening is provided on the outer wall of the frame facing away from the first accommodating cavity, and the first opening is connected to the second accommodating cavity; a second opening is provided on the inner wall of the frame facing the first accommodating cavity, and the second opening is connected to the second accommodating cavity; the main body is inserted into the second accommodating cavity through the first opening, and the connecting portion extends into the first accommodating cavity through the second opening.

[0008] In an embodiment of the present application, the second opening is disposed opposite to the adapter assembly.

[0009] In an embodiment of the present application, the second opening is relatively far away from the base relative to the main body.

[0010] In one embodiment of the present application, the battery pack also has a third direction, and the first direction, the second direction and the third direction are perpendicular to each other; the second opening has a target opening edge close to the base, and the target opening edge and the connecting portion are spaced apart from each other in the third direction.

[0011] In one embodiment of the present application, the battery pack also includes: a second plug-in, which is arranged on the frame; a battery management system, which is accommodated in the first accommodation cavity; and a communication harness, through which the second plug-in is electrically connected to the battery management system, wherein the communication harness passes through the second opening from the connecting part toward one side of the base.

[0012] In one embodiment of the present application, the two cavity walls of the second accommodating cavity in the first direction are respectively a first cavity wall and a second cavity wall, the first cavity wall is close to the main body, and the second cavity wall is close to the connecting part; wherein the distance between the first cavity wall and the main body is smaller than the distance between the second cavity wall and the connecting part.

[0013] In one embodiment of the present application, the battery pack also has a third direction, and the first direction, the second direction and the third direction are perpendicular to each other; the two cavity walls of the second accommodating cavity in the third direction are the third cavity wall and the fourth cavity wall, respectively, and the third cavity wall is farther away from the base than the fourth cavity wall; wherein the distance between the third cavity wall and the connecting portion is smaller than the distance between the fourth cavity wall and the main body.

[0014] In one embodiment of the present application, the battery pack also has a third direction, and the first direction, the second direction and the third direction are perpendicular to each other; the two cavity walls of the second accommodating cavity in the third direction are respectively the third cavity wall and the fourth cavity wall, and the third cavity wall is farther away from the base than the fourth cavity wall; wherein the third cavity wall and the connecting portion are spaced apart from each other, and the fourth cavity wall and the main body portion are spaced apart from each other.

[0015] In one embodiment of the present application, a first opening is provided on an outer wall of the frame facing away from the first accommodating cavity, and the first opening is connected to the second accommodating cavity; the battery pack also includes: a plug-in panel, the first plug-in is arranged on the plug-in panel, and the plug-in panel cover is arranged on the first opening; and a sealing member is arranged between the plug-in panel and the frame to seal the first opening.

[0016] The beneficial effect of the present application is as follows: Different from the prior art, the present application provides a battery pack. The connector of the battery pack includes a main body and a connecting portion. The main body extends along a first direction, and the main body is accommodated in a second accommodating cavity inside the frame. The connecting portion extends along a second direction, and the connecting portion extends into the first accommodating cavity to be electrically connected to the adapter assembly. In other words, most of the connector is located in the second accommodating cavity inside the frame, which can avoid the connector occupying additional space in the first accommodating cavity for accommodating single cells as much as possible, thereby facilitating the space utilization inside the battery pack, and further facilitating the improvement of the energy density of the battery pack. In addition, the connector does not occupy additional space in the first accommodating cavity, which can avoid problems such as difficulty in assembling components such as single cells as much as possible, and is conducive to improving the assembly efficiency of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 It is a structural schematic diagram of an embodiment of a battery pack of the present application;

[0019] Figure 2 It is a structural diagram of an embodiment of a plug-in component of the present application;

[0020] Figure 3 yes Figure 1 A schematic diagram of the top view of the battery pack shown;

[0021] Figure 4 yes Figure 3 The schematic diagram of the structure of the battery pack A area shown;

[0022] Figure 5 It is a structural schematic diagram of an embodiment of a connecting piece of the present application;

[0023] Figure 6 yes Figure 1 A schematic diagram of the side structure of the battery pack shown;

[0024] Figure 7 yes Figure 6 The schematic diagram of the structure of the battery pack B area shown;

[0025] Figure 8 yes Figure 1 A schematic diagram of the cross-sectional structure of the battery pack in CC direction is shown;

[0026] Fig. 9 yes Figure 8The schematic diagram of the structure of the battery pack E area shown;

[0027] Fig.10 It is a schematic diagram of the exploded structure of an embodiment of a box and plug-in assembly of a battery pack of the present application;

[0028] Fig.11 yes Fig.10 Schematic diagram of the structure of the battery pack box and plug-in component F area.

[0029] Description of reference numerals:

[0030] 10 housing; 11 base; 12 frame; 121 second accommodating cavity; 1211 first cavity wall; 1212 second cavity wall; 1213 third cavity wall; 1214 fourth cavity wall; 122 first opening; 123 second opening; 1231 target opening edge; 13 first accommodating cavity; 131 first sub-cavity; 132 second sub-cavity; 14 partition beam; 20 plug-in assembly; 21 first plug-in; 22 second plug-in; 23 plug-in panel; 24 sealing member; 31 connecting member; 311 main body; 312 connecting member; 40 adapter assembly; 41 adapter; 42 adapter bracket. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described 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 making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application and are not used to limit the present application. In the present application, unless otherwise stated, the directional words used, such as "up", "down", "left", and "right", generally refer to the up, down, left, and right of the device in actual use or working state, specifically the drawing direction in the accompanying drawings.

[0032] In this application, unless otherwise clearly specified and limited, the terms "connected", "connected", "stacked" and the like should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] The present application provides a battery pack, which is described in detail below. It should be noted that the description order of the following embodiments does not limit the preferred order of the embodiments of the present application. In the following embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0034] See also Figure 1 , Figure 1 It is a structural schematic diagram of an embodiment of a battery pack of the present application.

[0035] In one embodiment, the battery pack includes a box 10 and a plurality of single cells (not shown), and the plurality of single cells are accommodated in the box 10. Single cells include but are not limited to lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., which are not limited in the embodiments of the present disclosure. The battery pack is a power supply for electrical devices. Electrical devices can be mobile phones, portable devices, laptops, battery cars, electric cars, ships, spacecraft, electric toys and electric tools, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.

[0036] Please also read Figures 2 to 5 The box body 10 of the battery pack according to the embodiment of the present application is described below.

[0037] In one embodiment, the box body 10 includes a base 11 and a frame 12 disposed on the base 11. The frame 12 and the base 11 enclose a first accommodating cavity 13. The single battery is accommodated in the first accommodating cavity 13. Specifically, the box body 10 also includes a partition beam 14, which is accommodated in the first accommodating cavity 13. The partition beam 14 divides the first accommodating cavity 13 into a plurality of sub-cavities, including a first sub-cavity 131 and a second sub-cavity 132. The single battery is specifically accommodated in the first sub-cavity 131.

[0038] The battery pack also includes electrical components, which are used to control the charging and / or discharging of the single cells. The electrical components may include BDU (Battery Disconnect Unit) and BMS (Battery Management System). The electrical components are accommodated in the first accommodation cavity 13, specifically in the aforementioned second sub-cavity 132.

[0039] The battery pack further includes a plug-in assembly 20. The plug-in assembly 20 is electrically connected to the electrical components and is also used to connect to external devices. The single battery is charged and / or discharged through the plug-in assembly 20. The plug-in assembly 20 is connected to the frame 12, specifically to the rear frame 12a.

[0040] The plug-in assembly 20 includes a first plug-in 21. The battery pack also includes an adapter assembly 40. The first plug-in 21 is connected to the frame 12, and the first plug-in 21 is electrically connected to the electrical component through the adapter assembly 40. The first plug-in 21 can be specifically electrically connected to the BDU module of the electrical component. The first plug-in 21 is responsible for cutting off the high-voltage connection between the battery pack and other systems. When the battery pack needs to be maintained or safely operated, the first plug-in 21 can quickly cut off the high-voltage circuit to avoid the risk of electric shock. The first plug-in 21 usually has multiple safety protection functions. It can detect abnormal conditions such as overvoltage, overcurrent and overtemperature between the battery pack and the system, and take corresponding measures, such as cutting off the circuit, to ensure the safety of users and equipment. The first plug-in 21 can provide control and monitoring functions for the battery pack by communicating with the battery management system or the vehicle control module. It can send status information to the system and receive instructions to perform corresponding operations, such as cutting off or connecting the battery. The first plug-in 21 can monitor the battery pack and the circuit connected to it, and help identify faults in the battery pack or the power system by detecting abnormal signals and sending alarms, which helps to quickly locate and solve potential problems and improve the reliability and performance of the entire system. Specifically, the battery pack has a first direction perpendicular to each other (eg Figure 4 In the second direction (shown by the arrow X, the same below) and the second direction (as shown in Figure 4 As shown by arrow Y in the middle, the first plug-in 21 and the adapter assembly 40 are arranged in a spaced relationship along the first direction, and the first plug-in 21 and the electrical component are arranged in a spaced relationship along the second direction. The adapter assembly 40 is arranged on the partition beam 14 extending in the second direction.

[0041] The battery pack further includes a connector 31. The connector 31 is electrically connected to the first plug-in 21 and the adapter assembly 40, respectively, so that the first plug-in 21 is electrically connected to the adapter assembly 40. The frame 12 has a second accommodating cavity 121 inside, and at least part of the connector 31 is accommodated in the second accommodating cavity 121.

[0042] Please also read Figure 6 and Figure 7 , Figure 6 yes Figure 1 The side view of the battery pack is shown in FIG. Figure 7 yes Figure 6 Schematic diagram of the structure of the battery pack B area shown.

[0043] In one embodiment, the outer wall of the frame 12 away from the first accommodating cavity 13 is provided with a first opening 122, and the inner wall of the frame 12 close to the first accommodating cavity 13 is provided with a second opening 123, and both the first opening 122 and the second opening 123 are connected to the second accommodating cavity 121. The connecting member 31 includes a main body 311 and a connecting portion 312, such as Figure 5 As shown. The main body 311 is accommodated in the second accommodation cavity 121, and the main body 311 extends along the first direction. The connecting portion 312 extends along the second direction, and the connecting portion 312 extends into the first accommodation cavity 13. The connecting portion 312 is connected to one end of the main body 311 in the first direction, and the first plug-in 21 is connected to the other end of the main body 311 in the first direction. The connecting portion 312 passes through the second opening 123 and is electrically connected to the adapter assembly 40. The adapter assembly 40 is electrically connected to the portion of the connector 31 extending into the first accommodation cavity 13.

[0044] The volume of the portion of the connector 31 in the second accommodating cavity 121 is greater than the volume of the portion of the connector 31 outside the second accommodating cavity 121. In this way, most of the connector 31 is located in the second accommodating cavity 121 inside the frame 12, which can avoid the connector 31 from occupying additional space in the first accommodating cavity 13 for accommodating single cells as much as possible, thereby helping to improve the space utilization inside the battery pack, and further helping to improve the energy density of the battery pack. In addition, the connector 31 does not occupy additional space in the first accommodating cavity 13, which can avoid problems such as difficulty in assembling components such as single cells as much as possible, which is conducive to improving the assembly efficiency of the battery pack.

[0045] It should be noted that this embodiment allows the connector 31 to be installed into the second accommodating cavity 121 inside the frame 12 after the connector 31 is connected to the first plug-in 21, that is, the connector 31 and the first plug-in 21 are pre-assembled first, and then the connector 31 and the first plug-in 21 are installed into the frame 12 as a whole, thereby avoiding the connection operation between the connector 31 and the first plug-in 21 at the frame 12, which is beneficial to improving the assembly efficiency of the battery pack.

[0046] Furthermore, the opening area of ​​the first opening 122 is larger than the opening area of ​​the second opening 123. In this way, since the opening area of ​​the second opening 123 in this embodiment is smaller, the cut-off area of ​​the frame 12 is reduced, and the influence on the structural stability of the box body 10 is reduced to a certain extent.

[0047] Please also read Figure 8 and Fig. 9In one embodiment, the adapter assembly 40 includes an adapter 41 and an adapter bracket 42. The connecting portion 312 is electrically connected to the adapter 41 at the adapter bracket 42, and the adapter 41 extends along the second direction to the electrical component to be electrically connected to the electrical component, so that the connecting portion 312 is electrically connected to the electrical component. The connecting portion 31 and the adapter 41 both include positive and negative copper bars.

[0048] In one embodiment, the second opening 123 is arranged relative to the adapter assembly 40, and the connector 31 can be connected to the adapter assembly 40 after passing through the second opening 123, which can facilitate the connection between the connector 31 and the adapter assembly 40 and reduce the length of the connector 31. In addition, since the adapter assembly 40 is arranged on the partition beam 14 extending along the second direction, the adapter assembly 40 is relatively far away from the base 11. In view of this, the second opening 123 of this embodiment is far away from the base 11 relative to the main body 311, which can also facilitate the connection between the connector 31 and the adapter assembly 40 and reduce the length of the connector 31.

[0049] In one embodiment, the battery pack also has a third direction (such as Figure 7 As shown by the middle arrow Z, the same below), the first direction, the second direction and the third direction are perpendicular to each other. The second opening 123 has a target opening edge 1231 close to the base 11, that is, the target opening edge 1231 is the lower edge of the second opening 123. The target opening edge 1231 and the connecting portion 312 are spaced apart from each other in the third direction. The plug-in assembly 20 also includes a second plug-in 22, and the second plug-in 22 is arranged on the frame 12. The electrical component includes a battery management system, and the battery management system is accommodated in the first accommodating cavity 13. The second plug-in 22 is electrically connected to the battery management system. The battery pack also includes a communication harness, which is electrically connected to the second plug-in 22, and the communication harness passes through the gap between the target opening edge 1231 and the connecting portion 312 in the third direction to be electrically connected to the battery management system.

[0050] In one embodiment, the two cavity walls of the second accommodating cavity 121 in the first direction are respectively a first cavity wall 1211 and a second cavity wall 1212, wherein the first cavity wall 1211 is close to the end of the main body 311 away from the connecting portion 312, and the second cavity wall 1212 is close to the connecting portion 312. In the first direction, the first cavity wall 1211 and the main body 311 are spaced apart from each other, and the second cavity wall 1212 and the connecting portion 312 are spaced apart from each other, so as to provide sufficient operating space and facilitate the installation of the connecting member 31 into the second accommodating cavity 121.

[0051] Furthermore, considering that the connecting portion 312 needs to be connected to the adapter assembly 40, the installation position of the connecting portion 312 requires more operating space. In view of this, the distance D between the first cavity wall 1211 and the main body 311 in the first direction is smaller than the distance d between the second cavity wall 1212 and the connecting portion 312 in the first direction, so as to ensure that the installation position of the connecting portion 312 has sufficient operating space, so as to facilitate the connection between the connecting portion 312 and the adapter assembly 40.

[0052] In one embodiment, the two cavity walls of the second accommodating cavity 121 in the third direction are respectively the third cavity wall 1213 and the fourth cavity wall 1214, and the third cavity wall 1213 is farther away from the base 11 than the fourth cavity wall 1214. In the third direction, the third cavity wall 1213 and the connecting portion 312 are spaced apart from each other, and the fourth cavity wall 1214 and the main body portion 311 are spaced apart from each other, so as to provide sufficient operating space and facilitate the installation of the connecting member 31 into the second accommodating cavity 121.

[0053] Furthermore, considering that space for installing plastic parts needs to be reserved below the main body 311 and that screws at the bottom of the base 11 need to be avoided, more space needs to be reserved between the fourth cavity wall 1214 and the main body 311, that is, the distance w between the third cavity wall 1213 and the connecting portion 312 in the third direction is smaller than the distance W between the fourth cavity wall 1214 and the main body 311 in the third direction.

[0054] Please also read Fig.10 and Fig.11 , Fig.10 It is a schematic diagram of the exploded structure of an embodiment of the box and plug-in assembly of the battery pack of the present application, Fig.11 yes Fig.10 Schematic diagram of the structure of the battery pack box and plug-in component F area.

[0055] In one embodiment, the plug-in assembly 20 further includes a plug-in panel 23 and a seal 24. The first plug-in 21 and the second plug-in 22 are disposed on the plug-in panel 23, and the plug-in panel 23 covers the first opening 122. The seal 24 is disposed between the plug-in panel 23 and the frame 12 to seal the gap between the plug-in panel 23 and the frame 12. The seal 24 can be a sealing element such as a sealing ring, and the seal 24 is disposed around the outer periphery of the first opening 122 to ensure the airtightness of the internal space of the battery pack.

[0056] In summary, the present application provides a battery pack. The connector of the battery pack includes a main body and a connecting portion. The main body extends along a first direction, and the main body is accommodated in a second accommodating cavity inside the frame. The connecting portion extends along a second direction, and the connecting portion extends into the first accommodating cavity to be electrically connected to the adapter assembly. In other words, most of the connector is located in the second accommodating cavity inside the frame, which can avoid the connector occupying additional space in the first accommodating cavity for accommodating single cells as much as possible, thereby facilitating the space utilization inside the battery pack, and further facilitating the energy density of the battery pack. Moreover, the connector does not occupy additional space in the first accommodating cavity, which can avoid problems such as difficulty in assembling components such as single cells as much as possible, and is conducive to improving the assembly efficiency of the battery pack. In addition, the present application utilizes the structure of the box to provide a fixing point for the connector, and there is no need to add new parts such as a fixing bracket, which can save costs.

[0057] The battery pack provided by the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery pack, characterized in that: The battery pack has a first direction and a second direction perpendicular to each other, and the battery pack includes: The box body comprises a base and a frame arranged on the base, wherein the frame and the base are combined to form a first accommodating cavity, wherein the frame has a second accommodating cavity inside; A single battery is accommodated in the first accommodation cavity; An electrical component is accommodated in the first accommodation cavity; A first plug-in connected to the frame, wherein the first plug-in and the electrical component are spaced apart along the second direction; A connector, comprising a main body and a connecting portion; the main body extends along the first direction, the main body is accommodated in the second accommodation cavity, and the main body is electrically connected to the first plug-in; the connecting portion extends along the second direction, and extends into the first accommodation cavity; and The adapter assembly is accommodated in the first accommodation cavity, and the adapter assembly is electrically connected to the electrical component and the connecting portion respectively.

2. The battery pack according to claim 1, characterized in that: The connecting portion is connected to one end of the main body in the first direction, and the first plug-in is connected to the other end of the main body in the first direction.

3. The battery pack according to claim 1, characterized in that: The outer wall of the frame facing away from the first accommodating cavity is provided with a first opening, and the first opening is communicated with the second accommodating cavity; the inner wall of the frame facing the first accommodating cavity is provided with a second opening, and the second opening is communicated with the second accommodating cavity; the main body is inserted into the second accommodating cavity through the first opening, and the connecting portion extends into the first accommodating cavity through the second opening.

4. The battery pack according to claim 3, characterized in that: The second opening is arranged opposite to the adapter assembly.

5. The battery pack according to claim 3, characterized in that: The second opening is away from the base relative to the main body.

6. The battery pack according to claim 3, characterized in that: The battery pack further has a third direction, and the first direction, the second direction and the third direction are perpendicular to each other; The second opening has a target opening edge close to the base, and the target opening edge and the connecting portion are spaced apart from each other in the third direction.

7. The battery pack according to claim 3, characterized in that: The battery pack further comprises: A second plug-in, arranged on the frame; A battery management system is accommodated in the first accommodation cavity; and A communication harness, through which the second plug-in is electrically connected to the battery management system, wherein the communication harness passes through the second opening from the connecting portion toward one side of the base.

8. The battery pack according to claim 1, characterized in that: The two cavity walls of the second accommodating cavity in the first direction are respectively a first cavity wall and a second cavity wall, the first cavity wall is close to the main body portion, and the second cavity wall is close to the connecting portion; Wherein, the distance between the first cavity wall and the main body is smaller than the distance between the second cavity wall and the connecting part.

9. The battery pack according to claim 1, characterized in that: The battery pack further has a third direction, and the first direction, the second direction and the third direction are perpendicular to each other; two cavity walls of the second accommodating cavity in the third direction are respectively a third cavity wall and a fourth cavity wall, and the third cavity wall is farther away from the base than the fourth cavity wall; Wherein, the distance between the third cavity wall and the connecting portion is smaller than the distance between the fourth cavity wall and the main body portion.

10. The battery pack according to claim 1, characterized in that: The battery pack further has a third direction, and the first direction, the second direction and the third direction are perpendicular to each other; two cavity walls of the second accommodating cavity in the third direction are respectively a third cavity wall and a fourth cavity wall, and the third cavity wall is farther away from the base than the fourth cavity wall; Wherein, the third cavity wall and the connecting portion are spaced apart from each other, and the fourth cavity wall and the main body portion are spaced apart from each other.

11. The battery pack according to claim 1, characterized in that: The outer wall of the frame facing away from the first accommodating cavity is provided with a first opening, and the first opening is communicated with the second accommodating cavity; The battery pack further comprises: a plug-in panel, the first plug-in is disposed on the plug-in panel, and the plug-in panel covers the first opening; and A sealing member is disposed between the plug-in panel and the frame to seal the first opening.

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