Battery pack shell and battery pack

Abstract

The utility model relates to a battery pack shell and a battery pack, the battery pack shell comprises an upper cover, a bottom plate, a box body, a support and an explosion-proof valve mounted on the support, the upper cover, the bottom plate and the box body define a containing cavity used for containing battery monomers, and the support is mounted on the box body in a splicing manner and forms at least one part of the side wall of the box body; the anti-explosion valve can conduct or block communication between the containing cavity and the outside. The explosion-proof valve is installed on the box body through the support, in the whole battery pack machining process, the support can be independently machined, and then the machined support and the explosion-proof valve are fixed and then installed on the box body together, so that the structure of the box body is simplified, the machining difficulty of the box body is reduced, the design difficulty of a mold used for machining the box body can also be reduced, and the machining efficiency of the battery pack is improved. In addition, the installation difficulty of the explosion-proof valve is reduced, the installation time of the explosion-proof valve is shortened, and the assembly efficiency of the battery pack is improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery pack housing and a battery pack. Background Art

[0002] A battery pack includes a battery pack housing and a plurality of battery cells disposed within the battery pack housing. The battery pack housing includes an upper cover, a bottom plate, and a box body. The upper cover, the bottom plate, and the box body enclose a receiving cavity for accommodating the battery cells. The plurality of battery cells are stacked in the length direction, width direction, and height direction within the receiving cavity. In addition, an explosion-proof valve is installed on the battery pack housing. When one or more battery cells are thermally out of control, the explosion-proof valve can discharge high-temperature gas, high-temperature electrolyte, smoke, etc. in the receiving cavity to the outside to reduce the risk of damage to the battery pack.

[0003] Normally, the box body is integrally extruded in an aluminum profile in a rectangular shape. To reduce the difficulty of subsequent numerical control machining, the explosion-proof valve is installed on the upper cover. However, the upper cover is integrally injection-molded. When machining the upper cover, it is necessary to simultaneously machine structures such as mounting holes required for installing the explosion-proof valve, which increases the design difficulty of the upper cover, prolongs the design cycle, and complicates the machining process. At the same time, the structure of the injection mold for the upper cover is relatively complex, thereby increasing the overall machining cost of the battery pack housing. Summary of the Utility Model

[0004] This application provides a battery pack housing and a battery pack, which can reduce the design difficulty and machining cost of the battery pack housing.

[0005] This application provides a battery pack housing, including an upper cover, a bottom plate, and a box body. The upper cover, the bottom plate, and the box body enclose a receiving cavity for accommodating battery cells; it further includes a bracket and an explosion-proof valve. The bracket is installed on the box body in a spliceable manner and forms at least a part of the side wall of the box body. The explosion-proof valve is installed on the bracket, and the explosion-proof valve can conduct or block the communication between the receiving cavity and the outside.

[0006] In this application, the explosion-proof valve is installed on the box body through the bracket. During the entire machining process of the battery pack, the bracket can be machined separately. During the machining process of the bracket, holes for installing the explosion-proof valve are directly opened on the bracket. Thereafter, the machined bracket and the explosion-proof valve are fixed together and installed on the box body. This can simplify the structure of the box body and the battery pack housing, reduce the machining difficulty of the box body and the battery pack housing, and also reduce the design difficulty and cost of the mold for machining the box body. Furthermore, it is beneficial to reduce the machining cost of the battery pack housing. At the same time, the machining cycle of the mold is shortened, which is beneficial to shortening the machining cycle of the battery pack housing. In addition, the explosion-proof valve is first fixed to the bracket, and then the whole of the explosion-proof valve and the bracket is fixed to the box body, reducing the installation difficulty of the explosion-proof valve, which is beneficial to shortening the installation time of the explosion-proof valve.

[0007] In a possible design, the box body is provided with mounting hole positions, and at least a part of the bracket is located within the mounting hole positions; a limiting and mating portion is provided on the side wall of the bracket, and along the first direction and the third direction, the side wall of the mounting hole position abuts against the limiting and mating portion, the third direction is parallel to the thickness direction of the bracket, and the first direction is perpendicular to the third direction.

[0008] In a possible design, along the second direction, the mounting hole position penetrates through the side surface of the box body; both the first direction and the third direction are perpendicular to the second direction.

[0009] In a possible design, the bracket includes a body portion, a first end portion and a second end portion, the first end portion and the second end portion are respectively located on both sides of the body portion, and limiting and mating portions are provided on both the first end portion and the second end portion.

[0010] In a possible design, along the third direction, the thickness of the first end portion is greater than the thickness of the body portion, and / or the thickness of the second end portion is greater than the thickness of the body portion.

[0011] In a possible design, at least one of the side wall of the mounting hole position and the limiting and mating portion is provided with an adhesive, and the side wall of the mounting hole position and the limiting and mating portion are adhesively fixed.

[0012] In a possible design, the battery pack housing further includes a partition board, the partition board is installed on the box body, the partition board divides the accommodation cavity into a first cavity and a second cavity, the second cavity is used for accommodating battery cells, and the explosion-proof valve can conduct or block the second cavity from the outside.

[0013] In a possible design, the number of explosion-proof valves is one; or, the number of explosion-proof valves is multiple, and in a direction perpendicular to the third direction, the multiple battery cells are arranged at intervals.

[0014] In a possible design, the upper cover and the box body are fixedly connected by fasteners; along the width direction of the bracket, the bracket is located between two adjacent fasteners; or, at least one mounting and mating portion is provided on the bracket, the mounting and mating portion cooperates with the fastener for fixation, and the upper cover is fixedly connected to the bracket by the fastener.

[0015] In a possible design, the bracket is provided with a plurality of heat dissipation fins, the heat dissipation fins are located outside the box body, and along the length direction and / or the width direction of the bracket, the plurality of heat dissipation fins are arranged at intervals.

[0016] The second aspect of the present application provides a battery pack, the battery pack includes the battery pack housing described in any one of the above and at least one battery cell installed in the accommodation cavity.

[0017] In this application, the explosion-proof valve is installed on the box body through a bracket, which shortens the processing cycle and difficulty of the battery pack housing, reduces the processing cost. In addition, the explosion-proof valve is first fixed to the bracket, and then the whole of the explosion-proof valve and the bracket is fixed to the housing, which reduces the installation difficulty of the explosion-proof valve and thus improves the overall assembly efficiency of the battery pack.

[0018] It should be understood that the above general description and the following detailed description are only exemplary and do not limit this application. Brief Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of the battery pack provided by this application in one embodiment;

[0020] Figure 2 is Figure 1 a schematic structural diagram of the battery pack housing in one embodiment of ;

[0021] Figure 3 is Figure 1 a perspective view of the battery pack in one embodiment of ;

[0022] Figure 4 is Figure 3 an enlarged view of part A in ;

[0023] Figure 5 is Figure 3 a schematic structural diagram of the box body in one embodiment of ;

[0024] Figure 6 is Figure 3 a schematic structural diagram of the bracket in one embodiment of ;

[0025] Figure 7 is Figure 6 an enlarged view of part B in.

[0026] Reference Signs:

[0027] 1 - Battery pack housing;

[0028] 11 - Accommodating cavity;

[0029] 111 - First cavity;

[0030] 112 - Second cavity;

[0031] 12 - Upper cover;

[0032] 13 - Box body;

[0033] 131 - Mounting hole position;

[0034] 132 - Mounting mating part;

[0035] 14 - Partition board;

[0036] 15 - Bottom plate;

[0037] 2 - Battery cell;

[0038] 3 - Bracket;

[0039] 31 - Through hole;

[0040] 32 - Limit fitting part;

[0041] 33 - Body part;

[0042] 331 - Heat dissipation fin;

[0043] 34 - First end;

[0044] 35 - Second end;

[0045] 4 - Explosion - proof valve;

[0046] 5 - Electrical component.

[0047] The accompanying drawings here are incorporated into and constitute a part of this specification, showing embodiments in line with this application, and are used together with the specification to explain the principles of this application. Detailed implementation manners

[0048] For a better understanding of the technical solutions of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0049] It should be clear that the described embodiments are only a part of the embodiments of this application, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts belong to the scope of protection of this application.

[0050] The terms used in the embodiments of this application are only for the purpose of describing specific embodiments, and are not intended to limit this application. The singular forms of "a", "the" and "said" used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0051] It should be understood that the term " / and / " used herein is only a description of the associated relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0052] It should be noted that the orientation terms such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described from the angles shown in the drawings and should not be construed as limitations on the embodiments of the present application. In addition, in the context, it should also be understood that when it is mentioned that one component is connected "above" or "below" another component, it can not only be directly connected "above" or "below" another component, but also be indirectly connected "above" or "below" another component through an intermediate component.

[0053] The embodiments of the present application provide a battery pack. As Figure 1 shown, the battery pack includes a battery pack housing 1. As Figure 2 shown, the battery pack housing 1 includes an upper cover 12, a box body 13, and a bottom plate 15. The upper cover 12 and the bottom plate 15 respectively cover both sides of the box body 13, that is, the upper cover 12, the box body 13, and the bottom plate 15 together enclose a receiving cavity 11. A plurality of battery cells 2 and a plurality of electrical components 5 are installed in the receiving cavity 11. By dividing the battery pack housing 1 into three parts: the upper cover 12, the box body 13, and the bottom plate 15, during the processing, the upper cover 12, the box body 13, and the bottom plate 15 can be processed separately, thereby simplifying the processing technology and processing difficulty of the battery pack housing 1, which is conducive to shortening the processing cycle of the battery pack housing 1 and reducing the processing cost of the battery pack housing 1.

[0054] As Figure 2 shown, the battery pack further includes a partition 14. The partition 14 divides the receiving cavity 11 into a first cavity 111 and a second cavity 112. Among them, the partition 14 can be installed and fixed on the upper cover 12, can also be installed and fixed on the box body 13, or can be located between the upper cover 12 and the box body 13 and be clamped and fixed by the two. The embodiments of the present application do not make special limitations on the installation position and installation method of the partition 14. Figure 2 Taking the partition 14 installed and fixed on the box body 13 as an example, that is, the upper cover 12 and the partition 14 enclose the first cavity 111, and the partition 14, the box body 13, and the bottom plate 15 enclose the second cavity 112. The electrical components 5 are installed in the first cavity 111, and the battery cells 2 are installed in the second cavity 112. The explosion-proof valve 4 can conduct or block the connection between the second cavity 112 and the outside. A communication hole 31 can be provided on the partition 14. The communication hole 31 is used to communicate the first cavity 111 and the second cavity 112 to balance the pressure in the receiving cavity 11 and reduce the risk of damage to the battery cells 2, electrical components 5, partition 14, and even the battery pack housing 1 caused by different pressures between the first cavity 111 and the second cavity 112; at the same time, the partition 14 can play an insulating role between the first cavity 111 and the second cavity 112, reducing the mutual influence between the first cavity 111 and the second cavity 112, which is conducive to improving the working stability of the battery cells 2 and electrical components 5.

[0055] As Figure 2As shown in the figure, the battery pack housing 1 further includes a bracket 3 and an explosion-proof valve 4 mounted on the bracket 3. The explosion-proof valve 4 can conduct or block the communication between the accommodation chamber 11 and the outside. Specifically, when the battery pack is in a normal operating or non-operating state, the explosion-proof valve 4 blocks the communication between the accommodation chamber 11 and the outside to ensure the sealing inside the battery pack, thereby enhancing the stable operation of the battery cells 2 and electrical components 5 inside the battery pack. When one or more battery cells 2 inside the battery pack undergo thermal runaway, for example, when the temperature of the battery cell 2 rises abnormally, the temperature inside the accommodation chamber 11 increases, resulting in an increase in the pressure inside the accommodation chamber 11. Or when the electrolyte inside the battery cell 2 overflows inside the accommodation chamber 11, it will also cause the pressure inside the accommodation chamber 11 to increase. When the pressure inside the accommodation chamber 11 reaches the opening threshold of the explosion-proof valve 4, the explosion-proof valve 4 opens and conducts the communication between the accommodation chamber 11 and the outside, so that the high-temperature gas, high-temperature electrolyte, smoke, etc. inside the accommodation chamber 11 are discharged to the outside through the explosion-proof valve 4, thereby reducing the damage to the battery pack housing 1, electrical components 5 or other battery cells 2 due to excessive pressure inside the battery pack, thus enhancing the working stability of the battery pack, extending the service life of the battery pack, and reducing the maintenance cost of the battery pack.

[0056] Among them, as Figure 1 shown, the battery pack includes a first direction X, a second direction Y, and a third direction Z. Taking the bracket 3 as a reference, in the first direction X and the second direction Y, one is the length direction of the bracket 3, and the other is the width direction of the bracket 3. For example, the first direction X is the width direction of the bracket 3, the second direction Y is the length direction of the bracket 3, and the third direction Z is the thickness direction of the bracket 3.

[0057] A plurality of battery cells 2 and a plurality of electrical components 5 are installed inside the accommodation chamber 11. In the first direction X, the second direction Y, and the third direction Z, the battery cells 2 can be stacked in one direction, two directions, or even three directions. The electrical components 5 include, but are not limited to, busbars, circuit boards, etc. The embodiments of the present application do not make special limitations on the quantity, type, function, etc. of the electrical components 5 inside the battery pack housing 1.

[0058] In one embodiment, the bracket 3 is installed on the upper cover 12, which can reduce the cost and difficulty of numerical control machining of the box body 13.

[0059] In another embodiment, as Figure 3 and Figure 4As shown, the bracket 3 is installed on the box body 13 in a spliceable manner and forms at least a part of the side wall of the box body 13, which can reduce the design difficulty, processing difficulty and processing cost of the mold required for the injection molding of the upper cover 12. In addition, since the battery cell 2 is arranged in the second cavity 112 surrounded by the partition 14, the box body 13 and the bottom plate 15, and the explosion-proof valve 4 is arranged on the box body 13, the distance between the battery cell 2 and the explosion-proof valve 4 is reduced. When one or more battery cells 2 have thermal runaway, the high-temperature gas, high-temperature electrolyte, smoke, etc. in the second cavity 112 move to the explosion-proof valve 4 with a shorter distance, reducing the risk of the high-temperature gas, high-temperature electrolyte, smoke, etc. in the second cavity 112 moving into the first cavity 111, thereby reducing the risk that the electrical components 5 in the first cavity 111 work abnormally or are damaged under its influence, and further improving the working stability of the electrical components 5 and extending the service life of the electrical components 5.

[0060] In this embodiment, the explosion-proof valve 4 is installed on the box body 13 through the bracket 3. During the whole battery pack processing, the bracket 3 can be processed separately. During the processing of the bracket 3, holes for installing the explosion-proof valve 4 are directly opened on the bracket 3. After that, the processed bracket 3 and the explosion-proof valve 4 are fixed together and installed on the box body 13. This can simplify the structures of the box body 13 and the battery pack housing 1, reduce the processing difficulty of the box body 13 and the battery pack housing 1, and also reduce the design difficulty and cost of the mold for processing the box body 13, thereby facilitating the reduction of the processing cost of the battery pack housing 1. At the same time, the processing cycle of the mold is shortened, which is conducive to shortening the processing cycle of the battery pack housing 1. In addition, first fixing the explosion-proof valve 4 and the bracket 3, and then fixing the whole of the explosion-proof valve 4 and the bracket 3 on the box body 13 reduces the installation difficulty of the explosion-proof valve 4, which is conducive to shortening the installation time of the explosion-proof valve 4 and improving the overall assembly efficiency of the battery pack.

[0061] In the second direction Y, the explosion-proof valve 4 can be installed on the side of the box body 13 close to the upper cover 12, or the explosion-proof valve 4 can also be installed on the side of the box body 13 close to the bottom plate 15. Preferably, as Figure 1As shown, in the second direction Y (with the arrow of the second direction Y in the figure pointing upward and downward otherwise), the explosion-proof valve 4 is located in the middle of the box body 13, so that there is a small distance between the battery cells 2 stacked in the second direction Y and the explosion-proof valve 4. Taking the thermal runaway of the uppermost battery cell 2 as an example, the high-temperature gas, high-temperature electrolyte, smoke, etc. generated by the thermal runaway of the battery cell 2 will move towards the explosion-proof valve 4. Since the explosion-proof valve 4 is arranged in the middle of the box body 13, the risk of the high-temperature gas, high-temperature electrolyte, smoke, etc. passing through the battery cells 2 below the explosion-proof valve 4 is reduced, thereby reducing the impact of the battery cell 2 in the thermal runaway state on other battery cells 2, thus prolonging the service life of other battery cells 2. In addition, the movement distance of the high-temperature gas, high-temperature electrolyte, smoke, etc. is also shortened, which is beneficial for the explosion-proof valve 4 to quickly discharge them and improves the overall safety of the battery pack.

[0062] In addition, the number of the explosion-proof valves 4 can be one to reduce costs. The number of the explosion-proof valves 4 can also be multiple, and the multiple explosion-proof valves 4 are arranged at intervals along the first direction X and / or the second direction Y to improve the pressure relief effect of the explosion-proof valves 4.

[0063] The installation structure and installation method of the bracket 3 on the upper cover 12 are the same as those of the bracket 3 on the box body 13. Hereinafter, the installation of the bracket 3 on the box body 13 is taken as an example.

[0064] The specific structure of the box body 13 is as Figure 5 shown. The box body 13 is provided with mounting holes 131, and at least part of the bracket 3 is located in the mounting holes 131; the specific structure of the bracket 3 is as Figure 6 shown. The bracket 3 is provided with at least one through hole 31 for mounting the explosion-proof valve 4. In the embodiments of the present application, the types, sizes, numbers, etc. of the explosion-proof valves 4 are not specially limited, and parameters such as the number, position of the bracket 3, and the number and size of the through holes 31 on the bracket 3 can be adjusted according to requirements.

[0065] Specifically, as Figure 6 and Figure 7 shown, the side wall of the bracket 3 is provided with a limit matching portion 32. As Figure 4 shown, along the third direction Z and the first direction X, the side wall of the mounting hole 131 abuts against the limit matching portion 32.

[0066] In this embodiment, the limit matching portion 32 is taken as a groove. Then, as Figure 4As shown, a part of the side wall of the mounting hole 131 can be inserted into the groove, so as to realize the clamping connection between the bracket 3 and the box body 13 in the third direction Z and the first direction X, so as to realize the fixation of the bracket 3 and the box body 13. In addition, a groove can also be provided on the side wall of the mounting hole 131, and the limit matching part 32 is set as a protrusion, and a part of the protrusion is inserted into the groove to realize the clamping connection between the bracket 3 and the box body 13. The embodiment of the present application only takes the limit matching part 32 as a groove as an example for illustration.

[0067] In this embodiment, the fixed connection between the bracket 3 and the box body 13 is realized through the clamping connection between the bracket 3 and the box body 13, which simplifies the connection mode between the box body 13 and the bracket 3, thereby reducing the installation difficulty between the box body 13 and the bracket 3, and further facilitating the shortening of the installation cycle of the bracket 3 and the box body 13. In addition, it is also beneficial to simplify the structures of the box body 13 and the bracket 3, so as to reduce the design cycle, processing cycle and processing cost of the box body 13 and the bracket 3.

[0068] Specifically, after the bracket 3 and the box body 13 are clamped and matched, the bracket 3 and the box body 13 can also be fixedly bonded, welded or fixedly connected through parts such as bolts and pins to improve the connection stability between the bracket 3 and the box body 13. In this embodiment, at least one of the side wall of the mounting hole 131 and the limit matching part 32 is provided with an adhesive, and the side wall of the mounting hole 131 and the limit matching part 32 are fixedly bonded, thus simplifying the fixing form of the box body 13 and the bracket 3.

[0069] As Figure 5 shown, along the second direction Y, the mounting hole 131 penetrates through the side wall of the box body 13. Specifically, the mounting hole 131 can penetrate through one side or both sides of the box body 13.

[0070] In this embodiment, the mounting hole 131 penetrates through at least one side of the box body 13. During the process of installing the bracket 3, the bracket 3 can be slid into the mounting hole 131 from one side of the box body 13 along the second direction Y, thus simplifying the clamping connection mode between the bracket 3 and the box body 13, reducing the installation difficulty of the bracket 3 on the box body 13, and shortening the installation cycle.

[0071] In addition, after the bracket 3 is fixed to the box body 13, in the second direction Y, it is necessary to level the two side end faces of the bracket 3 and the box body 13, so that the end faces of the bracket 3 and the box body 13 on the side where the upper cover 12 is located are in the same plane, and the end faces of the bracket 3 and the box body 13 on the side where the bottom plate 15 is located are in the same plane. Taking the upper cover 12 as an example, when the end faces of the bracket 3 and the box body 13 on the side where the upper cover 12 is located are in the same plane, after the upper cover 12 is installed on the box body 13, the risk that the upper cover 12 is lifted by the bracket 3 resulting in a gap between the upper cover 12 and the box body 13 is reduced, and the contact between the upper cover 12 and the box body 13 is also reduced, thereby reducing the sealing difficulty between the upper cover 12 and the box body 13 and between the bottom plate 15 and the box body 13, which is conducive to improving the sealing performance of the battery pack.

[0072] As Figure 6 shown, the bracket 3 includes a body portion 33, a first end portion 34 and a second end portion 35. The first end portion 34 and the second end portion 35 are respectively located on both sides of the body portion 33. For example, the first end portion 34 and the second end portion 35 are located on both sides of the body portion 33 in the first direction X, and limiting and mating portions 32 are provided on both the first end portion 34 and the second end portion 35; along the third direction Z, the thickness of the first end portion 34 is greater than the thickness of the body portion 33, and / or the thickness of the second end portion 35 is greater than the thickness of the body portion 33.

[0073] In this embodiment, limiting and mating portions 32 are provided on both the first end portion 34 and the second end portion 35. During the process of sliding the bracket 3 into the mounting hole position 131 in the second direction Y, the two ends of the bracket 3 in the first direction X can be evenly stressed, thereby reducing the risk that one side of the bracket 3 is skewed and the bracket 3 is partially disengaged from the mounting hole position 131, thus improving the stability and reliability of the bracket 3 during the installation process. The thicknesses of the first end portion 34 and the second end portion 35 provided with the limiting and mating portions 32 are greater than the thickness of the body portion 33, which can increase the structural strength at the limiting and mating portions 32 while reducing the overall weight of the bracket 3, thereby reducing the risk of damage to the first end portion 34 and the second end portion 35 during processes such as processing, installation, transportation, and use, and further improving the service life of the bracket 3.

[0074] In any of the above embodiments, as Figure 4 and Figure 5 shown, the upper cover 12 and the box body 13, and the box body 13 and the bottom plate 15 are fixedly connected by fasteners. The fasteners include but are not limited to structures such as bolts and pins. That is, mounting and mating portions 132 are provided on the box body 13. When the fasteners are parts with threaded structures such as screws and bolts, the mounting and mating portions 132 are threaded holes or embedded parts with threaded holes. When the fasteners are pins, the mounting and mating portions 132 are grooves or through holes 31. The specific structures and types of the fasteners and the mounting and mating portions 132 are not particularly limited in the embodiments of the present application.

[0075] Among them, in one embodiment, as Figure 4 shown, along the first direction X, the bracket 3 is located between two adjacent mounting and mating parts 132, so as to simplify the structure of the bracket 3 and reduce the installation cost of the bracket 3.

[0076] In another embodiment, the width dimension of the bracket 3 in the first direction X is relatively large. At this time, at least one mounting and mating part 132 needs to be provided on the bracket 3 to improve the installation stability of the upper cover 12 and the bottom plate 15. Optionally, in order to increase the structural strength of the bracket 3, the overall thickness of the bracket 3 in the third direction Z can be increased to reduce the installation difficulty of the bracket 3, or the position where the mounting and mating part 132 is provided can be locally thickened to reduce the material cost and weight of the bracket 3.

[0077] In any of the above embodiments, as Figure 6 and Figure 7 shown, the bracket 3 is provided with a plurality of heat dissipation fins 331, and the heat dissipation fins 331 are located outside the box body 13. Along the first direction X and / or the second direction Y, the plurality of heat dissipation fins 331 are arranged at intervals.

[0078] In this embodiment, the provision of the heat dissipation fins 331 increases the contact area between the bracket 3 and the outside air, thereby facilitating the heat dissipation efficiency of the first cavity 111 at the bracket 3, and further reducing the risk of thermal runaway of the battery cells 2 in the first cavity 111.

[0079] In addition, a plurality of heat dissipation fins 331 can also be provided on the box body 13 to further improve the heat dissipation efficiency of the battery pack and improve the use safety of the battery pack.

[0080] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery pack housing, characterized in that, The battery pack housing (1) includes: an upper cover (12), a bottom plate (15), and a box body (13), the upper cover (12), the bottom plate (15), and the box body (13) enclose a receiving cavity (11) for receiving battery cells (2); a bracket (3), the bracket (3) is installed on the box body (13) in a spliceable manner and forms at least a part of the side wall of the box body (13); an explosion-proof valve (4), the explosion-proof valve (4) is installed on the bracket (3), and the explosion-proof valve (4) can conduct or block the connection between the receiving cavity (11) and the outside.

2. The battery pack housing according to claim 1, wherein, The box body (13) is provided with mounting holes (131), and at least a part of the bracket (3) is located within the mounting holes (131); The side wall of the bracket (3) is provided with a limit fitting portion (32), along the first direction (X) and the third direction (Z), the side wall of the mounting hole (131) abuts against the limit fitting portion (32), the third direction (Z) is parallel to the thickness direction of the bracket (3), and the first direction (X) is perpendicular to the third direction (Z).

3. The battery pack housing according to claim 2, characterized in that, Along the second direction (Y), the mounting hole (131) penetrates through the side surface of the box body (13); Both the first direction (X) and the third direction (Z) are perpendicular to the second direction (Y).

4. The battery pack housing according to claim 2, wherein, The bracket (3) includes a body portion (33), a first end portion (34), and a second end portion (35), the first end portion (34) and the second end portion (35) are respectively located on both sides of the body portion (33), and the first end portion (34) and the second end portion (35) are both provided with the limit fitting portion (32); Along the third direction (Z), the thickness of the first end portion (34) is greater than the thickness of the body portion (33), and / or the thickness of the second end portion (35) is greater than the thickness of the body portion (33).

5. The battery pack housing according to claim 2, characterized in that, At least one of the side wall of the mounting hole (131) and the limit fitting portion (32) is provided with an adhesive, and the side wall of the mounting hole (131) and the limit fitting portion (32) are adhesively fixed.

6. The battery pack housing according to any one of claims 1 to 5, characterized in that, The battery pack housing (1) further includes a partition plate (14), the partition plate (14) is installed on the box body (13), the partition plate (14) divides the receiving cavity (11) into a first cavity (111) and a second cavity (112), the second cavity (112) is used for receiving battery cells (2), and the explosion-proof valve (4) can conduct or block the connection between the second cavity (112) and the outside.

7. The battery pack housing according to any one of claims 1 to 5, characterized in that, The number of the explosion-proof valves (4) is one; Or, the number of the explosion-proof valves (4) is multiple, and in a direction perpendicular to the third direction (Z), the multiple explosion-proof valves (4) are arranged at intervals.

8. The battery pack housing according to any one of claims 1 to 5, characterized in that The upper cover (12) and the box body (13) are fixedly connected by fasteners; Along the width direction of the bracket (3), the bracket (3) is located between two adjacent fasteners; Alternatively, at least one mounting and mating portion (132) is provided on the bracket (3), the mounting and mating portion (132) is fixedly engaged with the fastener, and the upper cover (12) is fixedly connected to the bracket (3) through the fastener.

9. The battery pack housing according to any one of claims 1 to 5, characterized in that, The bracket (3) is provided with a plurality of heat dissipation fins (331), the heat dissipation fins (331) are located outside the box body (13), and a plurality of the heat dissipation fins (331) are arranged at intervals along the length direction and / or the width direction of the bracket (3).

10. A battery pack, characterized in that, The battery pack includes: The battery pack housing (1) according to any one of claims 1 to 9; At least one battery cell (2), and the battery cell (2) is installed in the accommodation cavity (11).

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