Battery pack

Abstract

The utility model provides a battery pack which comprises a shell, a battery module and a battery management system (BMS) module, and the battery pack is arranged between the battery module and the BMS module through an isolation plate and is hermetically connected with the shell, so that the BMS module and the battery module are isolated, and the technical problem that the BMS module is damaged by gas, jets and the like generated by thermal runaway of the battery module is solved.

Description

Technical Field

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

[0002] BMS (Battery Management System) plays a vital role in the health and safety of the battery. When the battery management system fails or there is a problem with the battery itself, it may cause the so-called thermal runaway phenomenon, causing damage to the BMS. In related technologies, based on considerations of battery pack cost and space limitations, the battery pack design is often simple and highly integrated, and there are deficiencies in the protection design during thermal runaway. Utility Model Content

[0003] The embodiment of the utility model provides a battery pack, which can improve the technical problem of damaging the BMS module when the existing battery pack has thermal runaway.

[0004] The battery pack provided in this application includes:

[0005] A housing, wherein a receiving space is provided in the housing;

[0006] A battery module, wherein the battery module is disposed in the accommodation space;

[0007] A BMS module is spaced apart from the battery module;

[0008] The isolation plate is disposed between the battery module and the BMS module and is sealed and connected to the housing to isolate the battery module from the BMS module.

[0009] In one embodiment, the shell includes a bottom wall and a shell wall, the shell wall is arranged around the periphery of the bottom wall to form the accommodating space, a shell opening is provided at one end of the shell wall away from the bottom wall, the isolation plate is provided at the shell opening, and the periphery of the isolation plate is sealed and connected to the shell wall.

[0010] In one embodiment, the battery pack further comprises a sealant layer, and the sealant layer is sealed and connected to a connection between the isolation plate and the shell wall.

[0011] In one embodiment, the battery pack further includes a sealing ring, which is sleeved on the isolation plate and abuts between the shell wall and the isolation plate.

[0012] In one embodiment, the isolation plate is disposed in the accommodating space and divides the accommodating space into a first chamber and a second chamber, the BMS module is disposed in the first chamber, the battery module is disposed in the second chamber, and the periphery of the isolation plate is sealed and connected to the shell.

[0013] In one embodiment, the isolation plate has a first opening, and the battery pack further includes a connecting wire, which passes through the first opening, one end of the connecting wire is connected to the battery module, and the other end of the connecting wire is connected to the BMS module.

[0014] In one embodiment, the isolation plate includes a first inner wall surrounding the first opening, and the connection line is sealingly connected to the first inner wall.

[0015] In one embodiment, the BMS module includes a bar and a control board, the bar is connected to a side of the control board facing the battery module, and the bar is provided with a through hole;

[0016] The battery module includes a battery pack and a busbar connected to the battery pack, wherein the busbar is provided with a via hole corresponding to the through hole;

[0017] The battery pack further includes a fastener, the isolation plate is provided with a second opening, and the fastener is passed through the second opening, the through hole and the via hole to fix the tab and the busbar.

[0018] In one embodiment, the isolation plate includes a second inner wall surrounding the second opening, and the fastener is sealingly connected to the second inner wall.

[0019] In one embodiment, the BMS module includes a cover body, the cover body includes a first connecting edge facing the shell, the shell includes a bottom wall and a shell wall surrounding the bottom wall, the shell wall includes a second connecting edge facing the cover body, the second connecting edge is arranged around the isolation plate, and the first connecting edge and the second connecting edge are sealed and connected.

[0020] Beneficial effects of the embodiments of the utility model:

[0021] In an embodiment of the utility model, the battery pack includes a shell, a battery module and a BMS module. An isolation plate is arranged between the battery module and the BMS module and is sealed with the shell to achieve isolation between the BMS module and the battery module, thereby improving the technical problem of gas, ejection, etc. generated by thermal runaway of the battery module damaging the BMS module. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1It is a schematic diagram of the structure of a battery pack provided by an embodiment of the utility model;

[0024] Figure 2 The explosion diagram of the battery pack provided by the embodiment of the utility model is shown in FIG. Figure 1 ;

[0025] Figure 3 The explosion diagram of the battery pack provided by the embodiment of the utility model is shown in FIG. Figure 2 ;

[0026] Figure 4 The explosion diagram of the battery pack provided by the embodiment of the utility model is shown in FIG. Figure 3 ;

[0027] Figure 5 The top view of the battery pack provided by the embodiment of the utility model Figure 1 ;

[0028] Figure 6 yes Figure 5 A cross-sectional view of a battery pack along AA provided in an embodiment;

[0029] Figure 7 The top view of the battery pack provided by the embodiment of the utility model Figure 2 ;

[0030] Reference numerals:

[0031] 100. Battery pack;

[0032] 10. Shell; 101. Accommodation space; 11. Bottom wall; 12. Shell wall; 13. Shell opening; 14. Second connecting edge; 141. Gasket;

[0033] 20. Battery module; 21. Battery pack; 22. Bus bar; 221. Main body; 222. Extension section; 2221. First extension section; 2222. Second extension section;

[0034] 30. BMS module; 31. bar; 311. first bar; 312. second bar; 313. first through hole; 314. second through hole; 32. control board; 33. cover; 331. first connecting edge;

[0035] 40, isolation plate; 41, first opening; 411, first inner wall; 412, first notch; 42, second opening; 421, second inner wall;

[0036] 50. Sealing ring;

[0037] 60. Fasteners;

[0038] 70. connecting wire; 71. connecting terminal; 72. connector. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0040] BMS (Battery Management System) plays a vital role in the health and safety of the battery. When the battery management system fails or there is a problem with the battery itself, it may cause the so-called thermal runaway phenomenon, causing damage to the BMS. In related technologies, based on considerations of battery pack cost and space limitations, the battery pack design is often simple and highly integrated, and there are deficiencies in the thermal runaway protection design.

[0041] See also Figure 1-Figure 3 , Figure 1 It is a schematic diagram of the structure of a battery pack provided in an embodiment of the utility model. Figure 2 The explosion diagram of the battery pack provided by the embodiment of the utility model is shown in FIG. Figure 1 . Figure 3 The explosion diagram of the battery pack provided by the embodiment of the utility model is shown in FIG. Figure 2. The battery pack 100 includes a shell 10, a battery module 20, a BMS module 30 and an isolation plate 40. The shell 10 is provided with a accommodating space 101. The battery module 20 is arranged in the accommodating space 101. The battery module 20 is assembled from a plurality of battery cells. The BMS module 30 is spaced apart from the battery module 20. The BMS is used to intelligently manage and maintain the battery, monitor the status of the battery, prevent the battery from being overcharged and over-discharged, so as to extend the service life of the battery. The isolation plate 40 is arranged between the battery module 20 and the BMS module 30, and is sealed and connected to the shell 10 to isolate the battery module 20 and the BMS module 30. The isolation plate 40 may be a heat-resistant insulating plastic. On the one hand, the isolation plate 40 of the present application can block the high-temperature gas and high-temperature ejecta generated by thermal runaway from being sprayed toward the BMS module 30, thereby isolating the flue gas from the BMS module 30. Since the isolation plate 40 is sealed and connected, when thermal runaway occurs in the battery module 20, the high-temperature gas and high-temperature ejecta generated by the thermal runaway will not be transmitted to the BMS module 30 along the joint between the isolation plate 40 and the shell 10, so that the isolation plate 40 can block the impact from the thermal runaway, ensure that the BMS module 30 is not damaged, and avoid damage to the BMS system, so that the BMS module 30 can report a thermal runaway warning signal. On the other hand, the isolation plate 40 is firmly connected to the shell 10, which can separate the battery module 20 from the BMS module 30, isolate the heat and heat radiation generated by the operation of the BMS module 30, and avoid the heating of the lower battery, so as to achieve the effect of insulation and heat insulation. In addition, the BMS module 30 is arranged on the isolation plate 40, which can play a fixing role for the BMS module 30 and prevent the BMS module 30 from detaching, so as to improve battery safety.

[0042] In some embodiments, the shell 10 includes a bottom wall 11 and a shell wall 12, the shell wall 12 is arranged around the bottom wall 11 to form a receiving space 101, and the end of the shell wall 12 away from the bottom wall 11 is provided with a shell opening 13 facing the BMS module 30, and the isolation plate 40 is arranged at the shell opening 13, and the periphery of the isolation plate 40 is sealed and connected to the shell wall 12. Providing the isolation plate 40 at the shell opening 13 away from the bottom wall 11 can increase the space of the battery module 20 and avoid the BMS module 30 and the battery module 20 being too close. Specifically, the BMS module 30 is arranged at the top of the shell 10 and is independently arranged from the battery module 20. The shell wall 12 includes an end face facing the BMS module 30 and an inner side face facing the receiving space 101, and the end face is arranged around to form the shell opening 13. In some embodiments, the bottom periphery of the isolation plate 40 is sealed to the end surface, that is, the isolation plate 40 is entirely located outside the shell 10; in some embodiments, the side surface of the isolation plate 40 is sealed to the end of the inner surface away from the bottom wall 11, that is, the isolation plate 40 is at least partially located in the accommodating space 101, and the top surface of the isolation plate 40 may be higher than the end surface or flush with the end surface, but not lower than the end surface.

[0043] In some embodiments, an explosion-proof valve is provided on the shell wall 12. When thermal runaway occurs in the battery module 20, the electrolyte is ejected outward from the explosion-proof valve. Since the BMS module 30 is provided on the top of the battery module 20 and is not in the direction of the electrolyte ejection, the BMS module 30 will not be impacted first. Under the premise that the BMS module 30 is not damaged, a thermal runaway alarm can be issued to timely detect a thermal runaway accident of the battery module 20.

[0044] In some embodiments, the battery pack 100 further includes a sealant layer (not shown in the figure), which is sealed and connected to the connection between the isolation plate 40 and the shell wall 12. Specifically, the sealant layer can be applied to the periphery of the isolation plate 40, or to the inner periphery of the shell wall 12. The sealant can be a liquid sealant, a hot melt sealant, a paste sealant, etc. The sealant has strong stability and good bonding effect, and can prevent the isolation plate 40 from moving or falling off.

[0045] In some embodiments, the battery pack 100 further includes a sealing ring 50, which can be made of a flexible material such as rubber or silicone. The sealing ring 50 is sleeved on the isolation plate 40 and abuts against the shell wall 12 and the isolation plate 40. Specifically, the sealing ring 50 is sleeved on the edge of the isolation plate 40, and the side of the sealing ring 50 away from the isolation plate 40 is attached to the shell wall 12. For example, a ring groove can be provided in the sealing ring 50, and the peripheral edge of the isolation plate 40 is installed in the ring groove and fits tightly with the sealing ring 50.

[0046] In some embodiments, the battery pack 100 also includes a sealing tape, which can be arranged on the periphery of the isolation plate 40, and then the isolation plate 40 is adhered to the shell wall 12; the sealing tape can also be adhered to the inner periphery of the shell wall 12, and then the isolation plate 40 is aligned with the sealing tape and adhered to fix the isolation plate 40.

[0047] It is understandable that those skilled in the art may adopt other methods to seal the isolation plate 40 to the shell wall 12, and the present application does not limit this.

[0048] In some embodiments, the isolation plate 40 is not limited to the housing opening 13, and the isolation plate 40 can be disposed in the accommodation space 101, and the accommodation space 101 is divided into a first chamber and a second chamber, the BMS module 30 is disposed in the first chamber, the battery module 20 is disposed in the second chamber, and the periphery of the isolation plate 40 is sealed and connected to the housing 10. Since the volume of the battery module 20 is smaller than that of the BMS module 30, the size of the first chamber can be smaller than that of the second chamber.

[0049] Specifically, the housing 10 is a square structure, and includes a bottom wall 11 and a housing wall 12 surrounding the bottom wall 11, and the housing wall 12 includes two side walls and two end walls arranged opposite to each other, and the length of the side walls is greater than the length of the end walls. The housing 10 also includes a top wall (not shown in the figure), and the top wall cover is arranged on the housing wall 12 to seal the accommodating space 101. The isolation plate 40 includes two opposite long sides and two opposite short sides. In some embodiments, the isolation plate 40 is arranged parallel to the end wall, that is, the two short sides of the isolation plate 40 are respectively sealed and connected to the two side walls, one of the long sides is connected to the bottom wall 11, and one of the long sides is connected to the top wall, so that the periphery of the isolation plate 40 and the shell 10 are sealed and connected, and a first chamber and a second chamber are separated in the horizontal direction to separate the battery module 20 from the BMS module 30; in some embodiments, the isolation plate 40 is arranged parallel to the bottom wall 11, the two long sides are respectively sealed and connected to the two side walls, and the two short sides are respectively sealed and connected to the two end walls, so as to separate the first chamber and the second chamber in the vertical direction to separate the battery module 20 from the BMS module 30.

[0050] In some embodiments, the isolation plate 40 is provided with a first opening 41, and the battery pack 100 further includes a connecting wire 70, which is passed through the first opening 41, one end of the connecting wire 70 is connected to the battery module 20, and the other end of the connecting wire 70 is connected to the BMS module 30. Specifically, a bracket is provided in the accommodating space 101, and the battery module 20 includes a bus 22, and the bus 22 is electrically connected to the bus 22 by being installed on the bracket. One end of the connecting wire 70 is connected to the bus 22, and the other end is connected to the BMS module 30. The connecting wire 70 includes a plurality of branch harnesses, and the end of the branch harnesses close to the BMS is tightened together by a connecting terminal 71. The BMS module 30 is provided with a connector 72, and the connecting terminal 71 is correspondingly connected to the connector 72, so as to transmit the collected signal to the BMS module 30 to control and manage the operation of the battery pack 100. The first opening 41 provided on the isolation plate 40 can facilitate the connection of the connecting wire 70 to the BMS module 20 , thereby reducing the wire length required for wiring and facilitating the wiring of the battery module 20 .

[0051] In some embodiments, the battery module 20 also includes a heat conductive sheet, on which a temperature collection portion is provided. The heat conductive sheet is electrically connected to the battery pack 100 via a bus 22. A connecting line 70 is passed through the first opening 41 and connected to the BMS module 30. The temperature information of the battery pack 100 can be transmitted to the BMS module 30 via the connecting line 70, so that the BMS module 30 can detect the temperature information of the battery pack 100 to prevent the battery pack 100 from overheating.

[0052] In some embodiments, the isolation plate 40 includes a first inner wall 411 surrounding the first opening 41, and the connecting wire 70 is sealed and connected to the first inner wall 411. The sealed connection can further prevent the high-temperature gas and high-temperature ejecta generated by thermal runaway from being transmitted to the BMS module 30 along the gap of the first opening 41, thereby increasing the safety of the BMS module 30. Specifically, the connection method between the connecting wire 70 and the first inner wall 411 can be a sealed connection between one end of the branch wiring harness close to the connecting terminal 71 and the first inner wall 411, or a sealed connection between the connecting terminal 71 and the first inner wall 411. The size and shape of the first opening 41 can be set according to actual conditions to ensure that the connecting wire 70 can be passed through the first opening 41. It can be understood that when the number of connecting wires 70 increases, a plurality of first openings 41 can be set accordingly.

[0053] In some embodiments, the connection line 70 and the first inner wall 411 may be connected by a sealant, a sealing ring, a sealing tape, etc., such as a sealant bonded between the connection line 70 and the first inner wall 411. It is understandable that those skilled in the art may adopt other methods to seal the connection line 70 to the first inner wall 411, and the present application does not limit this.

[0054] In some embodiments, the isolation plate 40 includes a protrusion, which protrudes toward the accommodation space 101 and forms a groove, the first inner wall 411 is the groove wall of the groove, and the sealing structure is filled in the groove. The end of the protrusion away from the BMS module 30 is provided with a first notch 412 opposite to the first opening 41, and the first notch 412 is smaller than the first opening 41 to guide the connection line 70 to pass through the BMS module direction 30. After passing through the first notch 412, the connection line 70 extends to the first opening 41 and is connected to the connector 72. The connection line 70 can be sealed and connected to the first notch 412 to increase the structural stability.

[0055] Please combine Figure 3 See also Figure 4-Figure 6 , Figure 4 The explosion diagram of the battery pack provided by the embodiment of the utility model is shown in FIG. Figure 3 . Figure 5 The top view of the battery pack provided by the embodiment of the utility model with the BMS module retained Figure 1 . Figure 6 yes Figure 5The cross-sectional view of the battery pack along AA is provided. In some embodiments, the BMS module 30 also includes a bar 31 and a control board 32. The control board 32 is installed on the side facing the battery module 20. The control board 32 is used to collect information of the battery module 20 and upload the information to the host computer, wherein the host computer is a computer and corresponding control software for the integrated management control board. The bar 31 is connected to the side of the control board 32 facing the battery module 20, and the bar 31 is provided with a through hole. The battery module 20 includes a battery pack 21 and a bus 22 connected to the battery pack 21, and the bus 22 is provided with a through hole corresponding to the through hole. The bus 22 is used to realize the collection, distribution and derivation of current to ensure the safe and efficient operation of the battery system. The battery pack 100 also includes a fastener 60, and the isolation plate 40 is provided with a second opening 42. The fastener 60 is penetrated through the second opening 42, the through hole and the through hole to fix the bar 31 and the bus 22. By connecting the tab 31 and the bus 22, the BMS module 30 can measure the voltage of the battery module 20 to monitor the battery status. The second opening 42 is provided on the isolation plate 40 to facilitate the connection between the tab 31 and the bus 22, and ensure the stability and reliability of the battery pack 100 without changing the internal structure of the original battery pack 100.

[0056] Specifically, see Figure 7 , Figure 7 This is a top view of the battery pack provided by the embodiment of the utility model with the BMS module removed. Figure 2 . The battery pack 21 includes a plurality of battery cells, and the bus 22 includes a main body 221 and an extension section 222. The bus 22 can be a copper bus, an aluminum bus, etc. The main body 221 includes a plurality of busbars, and the two ends of each busbar are electrically connected to the first electrode of the first battery cell and the second electrode of the second battery cell, respectively. The first battery cell and the second battery cell are two adjacent battery cells in the direction of series connection among the plurality of battery cells, and the first electrode and the second electrode have opposite polarities. The third battery cell, the fourth battery cell, and so on are analogous. Since this is common knowledge in the art, this application will not be described in detail here. The busbar connected to the first battery cell is connected to the first extension section 2221, and the busbar connected to the last battery cell is connected to the second extension section 2222. The first extension section 2221 and the second extension section 2222 have opposite polarities.

[0057] Among them, the bar 31 is connected to the side of the control board 32 facing the battery pack 21, and the bar 31 includes a first bar 311 and a second bar 312. The first bar 311 and the first extension section 2221 have the same polarity, and the second bar 312 and the second extension section 2222 have the same polarity. For example, the first bar 311 is a negative electrode and is connected to the first extension section 2221, which is also a negative electrode. The second bar 312 is a positive electrode and is connected to the second extension section 2222, which is also a positive electrode. The battery pack 100 also includes a plurality of fasteners 60, and the fasteners 60 can be screws, bolts, studs, etc. The bus 22 and the bar 31 connected by the fasteners 60 are easy to install and disassemble, and the reliability and stability of the connection are higher. Specifically, there are at least two second openings 42, and each fastener 60 is penetrated in a second opening 42. The second opening 42 is arranged on one side of the isolation plate 40 and is spaced apart from the first opening 41. The size and shape of the second opening 42 can be set according to actual conditions to ensure that the fastener 60 can be inserted into the second opening 42. The first tab 311 is provided with a first through hole 313, the first extension section 2221 is provided with a first through hole, the first tab 311 is attached to the first extension section 2221, and a fastener 60 is inserted into the first through hole 313 and the first through hole to fix the first tab 311 and the first extension section 2221; the second tab 312 is provided with a second through hole 314, the second extension section 2222 is provided with a second through hole, the second tab 312 is attached to the second extension section 2222, and a fastener 60 is inserted into the second through hole 314 and the second through hole to fix the second tab 312 and the second extension section 2222.

[0058] In some embodiments, the isolation plate 40 includes a second inner wall 421 surrounding the second opening 42, and the fastener 60 is sealed and connected to the second inner wall 421. The sealed connection can further prevent the high-temperature gas and high-temperature ejecta generated by thermal runaway from being transmitted to the BMS module 30 along the gap of the second opening 42, thereby increasing the safety of the BMS module 30. Specifically, after a fastener 60 fixes the first extension section 2221 and the first bar 311, it is sealed and connected to the second inner wall 421 through a sealing structure; after a fastener 60 fixes the second extension section 2222 and the second bar 312, it is sealed and connected to the second inner wall 421 through a sealing structure. The fastener 60 and the second inner wall 421 can be connected by a sealant, a sealing ring, a sealing tape, and other structures, such as a sealant bonded between the fastener 60 and the second inner wall 421. It can be understood that those skilled in the art can adopt other methods to make the fastener 60 sealed and connected to the second inner wall 421, and the present application is not limited here.

[0059] Please continue reading Figure 6-Figure 7 , Figure 6 It is a cross-sectional view of a battery pack along AA provided by an embodiment of the present utility model. Figure 7The top view of the battery pack provided by the embodiment of the utility model Figure 2 In some embodiments, the BMS module 30 includes a cover 33, the cover 33 includes a first connection edge 331 facing the shell 10, the shell 10 includes a bottom wall 11 and a shell wall 12 surrounding the bottom wall 11, the shell wall 12 also includes a second connection edge 14 facing the cover 33, and the second connection edge 14 is arranged around the isolation plate 40. Specifically, the shell wall 12 includes an end face facing the BMS module 30, the second connection edge 14 is connected to the periphery of the end face, when the isolation plate 40 is arranged at the shell opening 13, the isolation plate 40 and the first connection edge 331 are located in the same plane, when the isolation plate 40 is arranged in the accommodating space 101, the isolation plate 40 is arranged lower than the first connection edge 331. Among them, the first connection edge 331 and the second connection edge 14 are adapted, when the cover 33 is covered on the shell 10, the first connection edge 331 and the second connection edge 14 are sealed and connected, and the first connection edge 331 and the second connection edge 14 can be fastened and connected around by fastening structures such as screws, bolts, and bolts. Those skilled in the art may also connect the cover 33 and the housing 10 by plugging, snapping, etc., which is not limited in the present application.

[0060] In some embodiments, the shell 10 also includes a gasket 141, a groove is provided in the second connecting edge 14, the gasket 141 is disposed in the groove, the cover body 33 includes a protrusion, the protrusion is connected to the first connecting edge 331 and protrudes toward the shell 10, when the cover body 33 is covered on the shell 10, the protrusion is embedded in the gasket 141 to increase the sealing effect of the cover body 33 and the shell 10.

[0061] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, 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 invention.

Claims

1. A battery pack, characterized in that: include: A housing, wherein a receiving space is provided in the housing; A battery module, wherein the battery module is disposed in the accommodation space; A BMS module is spaced apart from the battery module; The isolation plate is disposed between the battery module and the BMS module and is sealed and connected to the housing to isolate the battery module from the BMS module.

2. The battery pack according to claim 1, characterized in that: The shell comprises a bottom wall and a shell wall, wherein the shell wall is arranged around the periphery of the bottom wall to form the accommodating space, a shell opening is arranged at one end of the shell wall away from the bottom wall, the isolation plate is arranged at the shell opening, and the periphery of the isolation plate is sealed and connected to the shell wall.

3. The battery pack according to claim 2, characterized in that: The battery pack further comprises a sealing adhesive layer, and the sealing adhesive layer is sealingly connected to the connection between the isolation plate and the shell wall.

4. The battery pack according to claim 2, characterized in that: The battery pack further comprises a sealing ring, which is sleeved on the isolation plate and abuts between the shell wall and the isolation plate.

5. The battery pack according to claim 1, characterized in that: The isolation plate is arranged in the accommodating space and divides the accommodating space into a first chamber and a second chamber. The BMS module is arranged in the first chamber, and the battery module is arranged in the second chamber. The periphery of the isolation plate is sealed and connected to the shell.

6. The battery pack according to any one of claims 1 to 5, characterized in that: The isolation plate is provided with a first opening, and the battery pack further includes a connecting wire, which is passed through the first opening, one end of the connecting wire is connected to the battery module, and the other end of the connecting wire is connected to the BMS module.

7. The battery pack according to claim 6, characterized in that: The isolation plate includes a first inner wall surrounding the first opening, and the connection line is sealingly connected to the first inner wall.

8. The battery pack according to any one of claims 1 to 5, characterized in that: The BMS module includes a bar and a control board, wherein the bar is connected to a side of the control board facing the battery module, and the bar is provided with a through hole; The battery module includes a battery pack and a busbar connected to the battery pack, wherein the busbar is provided with a via hole corresponding to the through hole; The battery pack further includes a fastener, the isolation plate is provided with a second opening, and the fastener is passed through the second opening, the through hole and the via hole to fix the tab and the busbar.

9. The battery pack according to claim 8, characterized in that: The isolation plate includes a second inner wall surrounding the second opening, and the fastener is sealingly connected to the second inner wall.

10. The battery pack according to claim 1, characterized in that: The BMS module includes a cover body, the cover body includes a first connecting edge facing the shell, the shell includes a bottom wall and a shell wall surrounding the bottom wall, the shell wall includes a second connecting edge facing the cover body, the second connecting edge is arranged around the isolation plate, and the first connecting edge and the second connecting edge are sealed and connected.

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