Battery holder and battery pack

Abstract

The application provides a battery support and a battery pack. The battery support is used for fixing a first battery module to one side of a second battery module along a first direction. The second battery module is provided with an exhaust port. The battery support comprises a body. The body is provided with an exhaust passage, a flow guide structure and a module mounting position for fixing the first battery module. The body comprises a first surface facing the first battery module and a second surface facing the second battery module. The exhaust passage comprises an air outlet provided on the first surface and an air inlet provided on the second surface. The exhaust passage is in communication with the exhaust port of the second battery module. The module mounting position is provided on the first surface. The air outlet of the exhaust passage is arranged in a staggered manner with the module mounting position. The flow guide structure is arranged in correspondence with the air outlet of the exhaust passage and is used for guiding the high-temperature gas discharged from the second battery module through the exhaust passage to a pressure relief valve of the battery pack. The high-temperature gas generated when the second battery module is in thermal runaway is discharged in time through the battery support.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing, and more specifically, to a battery holder and a battery pack. Background Technology

[0002] The driving range of an electric vehicle is closely related to the capacity of its onboard battery pack; therefore, battery packs with larger capacity have become a major demand. A battery pack typically includes multiple battery modules connected in series and parallel. To accommodate more battery modules within a limited volume, a two-layer architecture can be designed, consisting of two layers of battery modules. A bracket is placed above the bottom battery module to secure the upper battery module, and copper busbars connect the upper and lower modules in series and parallel, thereby increasing the battery pack's energy capacity.

[0003] For battery packs with a two-layer architecture, when the battery module at the bottom of the support experiences thermal runaway, the ejected hot airflow and particulate matter cannot be discharged quickly. This accelerates the failure rate inside the battery module at the bottom of the support, making the heat spread more intense. The hot airflow inside the battery pack will run around wildly, severely affecting the safety of other components and modules inside the battery pack, which in turn will cause the battery module at the top of the support to fail and spread heat. Summary of the Invention

[0004] The present invention aims to at least solve the problem in the prior art that when the bottom battery module in a double-layer battery pack experiences thermal failure, the high-temperature air generated cannot be quickly discharged, and proposes a battery bracket and a battery pack.

[0005] To achieve the purpose of this invention, a battery bracket is provided. The battery bracket is used to fix a first battery module to one side of a second battery module along a first direction. The second battery module is provided with an exhaust port. The battery bracket includes a body, on which an exhaust channel, a flow guiding structure, and a module mounting position for fixing the first battery module are provided. The body includes a first surface facing the first battery module and a second surface facing the second battery module. The exhaust channel includes an outlet on the first surface and an inlet on the second surface. The exhaust channel is connected to the exhaust port of the second battery module. The module mounting position is provided on the first surface. The outlet of the exhaust channel is offset from the module mounting position. The flow guiding structure is correspondingly provided at the outlet of the exhaust channel to guide the high-temperature gas discharged from the second battery module through the exhaust channel to the pressure relief valve of the battery pack.

[0006] Optionally, the flow guiding structure includes a back plate and two side plates. The back plate is located on the side of the exhaust channel away from the pressure relief valve at the outlet, and is inclined from bottom to top toward the side closer to the pressure relief valve. The two side plates are located opposite each other on both sides of the back plate and are connected to the back plate.

[0007] Optionally, the airflow guiding structure also includes a front panel, which is located on the side of the exhaust channel opposite to the back panel, and the front panel and the back panel are arranged parallel to each other.

[0008] Optionally, the body also includes a reinforcing rib disposed at the module mounting position. The reinforcing rib is recessed relative to the second surface of the body and protrudes relative to the first surface of the body to enhance the structural strength of the body.

[0009] Optionally, the portion of the reinforcing rib that is recessed relative to the second surface of the body is connected to the exhaust channel to guide the high-temperature gas discharged from the second battery module to the exhaust channel.

[0010] Optionally, the battery holder also includes a reinforcing structure for supporting the body. The reinforcing structure is disposed on the second surface of the body and includes a first reinforcing beam disposed around the edge of the second surface of the body and a second reinforcing beam disposed in the middle of the body.

[0011] Optionally, the first reinforcing beam encloses an inner space, the side of the first reinforcing beam facing the inner space is the first side, and the side away from the inner space is the second side. The first reinforcing beam is provided with an exhaust structure, which is used to connect the first side and the second side to exhaust high-temperature gas from the first side to the second side.

[0012] Optionally, the exhaust structure includes an exhaust port that extends through the first reinforcing beam along its width.

[0013] Optionally, the reinforcing structure also includes an inner reinforcing beam, the bottom of which is provided with a groove, and the inner reinforcing beam is embedded in the groove to enhance the structural strength of the second reinforcing beam.

[0014] Optionally, the second reinforcing beam includes two main beams and a connecting beam between the two main beams, with one end of the two main beams arranged to gradually approach each other along the extension direction.

[0015] Optionally, the battery bracket further includes a first connector and a second connector. The first connector is disposed at the module mounting position and is used to fix the first battery module at the module mounting position. The second connector is disposed on the body and is used for the battery bracket and the battery pack.

[0016] Optionally, both the first and second connectors are provided with ribs to enhance their structural strength.

[0017] Optionally, the battery bracket further includes a first reinforcing block and a second reinforcing block, the first reinforcing block being disposed below the first connector to support the first connector, and the second reinforcing block being disposed below the second connector to support the second connector.

[0018] The battery pack provided by the present invention includes a battery pack housing, a first battery module, a second battery module, and a battery bracket as described above. A pressure relief valve is provided on the battery pack housing, and the battery bracket is fixedly disposed inside the battery pack housing.

[0019] The present invention has the following beneficial effects:

[0020] The battery bracket provided in this application allows battery modules to be stacked within the battery pack. When the second battery module experiences thermal runaway due to an accident, the high-temperature gas it generates can be discharged to one side of the first battery module through the exhaust channel, and then flow to the pressure relief valve under the guidance of the flow guiding structure. This ensures that the high-temperature gas is well guided, avoiding poor discharge caused by disordered flow, thereby preventing heat accumulation from affecting other battery modules or components within the battery pack.

[0021] The battery pack provided by this invention uses a battery bracket to stack battery modules inside the battery pack, which increases the battery pack's capacity and allows high-temperature gases generated when the battery modules experience thermal runaway to be released in a timely manner, avoiding chain reactions and improving the safety of the battery pack. Attached Figure Description

[0022] Figure 1 This is a structural diagram of one embodiment of the battery holder used in this application;

[0023] Figure 2 This is a schematic diagram of the connection structure between the battery bracket and the first battery module and the second battery module used in this application;

[0024] Figure 3 for Figure 1 Exploded view of the structure;

[0025] Figure 4 This is an exploded view of the reinforcing structure used in this application;

[0026] Figure 5 This is a partial bottom surface structural diagram of the battery holder used in this application;

[0027] Figure 6 This is a schematic diagram of the structure of the first and second connectors used in this application;

[0028] Figure 7 This is a schematic diagram of the battery pack used in this application.

[0029] Figure Labels

[0030] 100 - Body, 110 - Exhaust channel, 120 - Airflow guide structure, 121 - Back plate, 122 - Side plate

[0031] 123-Front panel, 130-Module mounting position, 140-Reinforcing rib, 150-First connector, 151-Stamping rib structure, 160-Second connector, 200-Reinforcing structure, 210-First reinforcing beam, 211-Exhaust hole, 220-Second reinforcing beam, 221-Main beam, 222-Connecting beam, 230-Inner reinforcing beam, 300-Second reinforcing block, 400-First battery module, 500-Second battery module, 600-Battery pack housing, 610-Pressure relief valve, 620-Crossbeam. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solution of the present invention, the battery bracket and battery pack provided by the present invention will be described in detail below with reference to the accompanying drawings.

[0033] To achieve the purpose of this invention, a battery holder is provided. The battery holder is used to fix a first battery module 400 to one side of a second battery module 500 along a first direction. The second battery module 500 is provided with an exhaust port. The battery holder includes a body 100, on which an exhaust channel 110, a flow guiding structure 120, and a module mounting position 130 for fixing the first battery module 400 are provided. The body 100 includes a first surface facing the first battery module 400 and a surface facing the second battery module 500. The second surface, the exhaust channel 110 includes an outlet on the first surface and an inlet on the second surface. The exhaust channel 110 is connected to the exhaust port of the second battery module 500. The module mounting position 130 is located on the first surface. The outlet of the exhaust channel 110 is offset from the module mounting position 130. The flow guiding structure 120 is correspondingly located at the outlet of the exhaust channel 110 and is used to guide the high-temperature gas discharged from the second battery module 500 through the exhaust channel 110 to the pressure relief valve 610 of the battery pack.

[0034] It should be noted that the first direction refers to the stacking direction of multiple battery modules in the battery pack. Figure 1-2 For example, the figure shows one embodiment of the internal structure of the battery pack.

[0035] In this battery pack, the battery modules are stacked in two layers along the height of the battery pack. Thermal runaway of the battery modules typically occurs when the separator of the cells within the module ruptures for some reason, causing a short circuit between the positive and negative electrodes due to the internal electrolyte. This leads to a chemical reaction between the electrodes, generating numerous byproducts and releasing heat, which manifests as the module emitting smoke. This process is continuous; during combustion, newly generated smoke can push existing smoke to flow. Without guidance, the smoke will flow randomly within the battery pack; with guidance, the smoke will flow naturally. Furthermore, the thermal runaway of the battery modules generates high-temperature gas, which naturally has an upward flow tendency. Therefore, in this application, the first battery module 400 can be vertically positioned above the second battery module 500, and the battery support can naturally be positioned above the second battery module 500, thus achieving a better guiding effect on the generated high-temperature gas.

[0036] The battery bracket provided in this application allows battery modules to be stacked within the battery pack. When the second battery module 500 experiences thermal runaway due to an unexpected event, the high-temperature gas it generates can be discharged through the exhaust port on its outer casing. Specifically, the second battery module 500 can be sealed by applying adhesive to both ends along its length. An exhaust port is provided on the upper casing of the second battery module 500, ensuring that the high-temperature gas generated by the second battery module 500 will only be discharged through the exhaust port during thermal runaway. This allows the high-temperature gas generated by the second battery module 500 to be directly discharged towards the main body 100, minimizing disordered flow of the high-temperature gas. Simultaneously, the high-temperature gas generated by the second battery module 500 can be discharged through the exhaust channel 110 to one side of the first battery module 400, and then guided by the flow guiding structure 120 to the pressure relief valve 610. This ensures good guidance of the high-temperature gas, preventing poor discharge due to disordered flow and thus avoiding heat accumulation that could affect other battery modules or components within the battery pack.

[0037] In the above technical solution, the battery bracket can be made of high-strength steel, aluminum alloy, or other materials. Due to differences in the properties and strength of these materials, parameters such as the thickness of the structure can be set according to the characteristics of the material to meet the structural strength requirements of the battery bracket. Specifically, using... Figure 1 As shown in the example, this is one embodiment of the present application, which is manufactured using sheet metal processing, making the body 100 a thin plate structure. To enhance its strength, high-strength steel can be used as the material. Specifically, its thickness can be set to 1.5mm. High-strength steel has a higher melting point, thus it has better heat resistance and impact resistance. In the event of thermal runaway in a battery module within the battery pack, a battery bracket made of high-strength steel is better able to prevent damage to the battery structure compared to aluminum alloy. For battery brackets made of high-strength steel, such as... Figure 1 as well as Figure 3 As shown, the exhaust channel 110 provided on the main body 100 can be simplified to a through hole extending through the main body 100. When the main body 100 is a structure with a certain thickness, the exhaust channel 110 can also be a more complex structure, as long as it can connect both sides of the main body 100. The flow guiding structure 120 can guide the high-temperature gas in various ways. For example, a flow guide plate can be provided in the flow direction of the high-temperature gas to change the flow direction of the high-temperature gas, or a bent channel structure can be provided, or a component such as a fan can be used to change the flow direction of the high-temperature gas by driving the fan.

[0038] As a specific implementation method, such as Figure 1-3 As shown, the flow guiding structure 120 includes a back plate 121 and two side plates 122. The back plate 121 is located on the side of the exhaust channel 110 away from the pressure relief valve 610, and is inclined from bottom to top towards the side closer to the pressure relief valve 610. The two side plates 122 are arranged opposite to each other on both sides of the back plate 121 and are connected to the back plate 121. The back plate 121 ensures that the high-temperature gas discharged through the exhaust channel 110 flows towards the pressure relief valve 610 under the obstruction and guidance of the back plate 121.

[0039] Furthermore, such as Figure 1-3 As shown, the airflow guiding structure 120 also includes a front plate 123, which is disposed on the side of the exhaust channel 110 opposite to the back plate 121. The front plate 123 is arranged parallel to the back plate 121. The front plate 123 can prevent high-temperature gases from corroding components located near the exhaust channel 110. The height of the front plate 123 can be set according to the position and size of other components on the main body 100.

[0040] like Figure 1-3 as well as Figure 5 As shown, the body 100 also includes a reinforcing rib 140 disposed at the module mounting position 130. The reinforcing rib 140 is recessed relative to the second surface of the body 100 and protrudes relative to the first surface of the body 100 to enhance the structural strength of the body 100. By forming the reinforcing rib 140 disposed according to the above structure on the body 100, the deformation resistance of the body 100 can be improved without significantly increasing the weight by forming a downwardly curved arched structure on the body 100. This includes resistance to weight, vibration, and impact forces perpendicular to the body 100, as well as horizontal forces. Consequently, the body 100 has better structural strength to support the first battery module 400, preventing the body 100 from bending and deforming due to excessive weight of the first battery module 400, or preventing the first battery module 400 from falling off the module mounting position 130 due to insufficient structural strength.

[0041] The reinforcing rib 140 can be configured as a strip structure extending along the design direction, a simple convex hull structure, or a combination of the above configurations. Multiple reinforcing ribs 140 can be provided, such as... Figure 5 As shown, the portion of the reinforcing rib 140 that is recessed relative to the second surface of the body 100 is connected to the exhaust channel 110 to guide the high-temperature gas discharged from the second battery module 500 to the exhaust channel 110. Through these reinforcing ribs 140 connected to the exhaust channel 110, they can serve as an extension of the exhaust channel 110, further guiding the high-temperature gas generated by the second battery module 500.

[0042] To further improve the structural strength of the battery holder, such as Figures 1-4 As shown, the battery bracket also includes a reinforcing structure 200 for supporting the body 100. The reinforcing structure 200 is disposed on the second surface of the body 100 and includes a first reinforcing beam 210 disposed around the edge of the second surface of the body 100 and a second reinforcing beam 220 disposed in the middle of the body 100. The reinforcing structure 200 effectively strengthens the support strength at the edges and center of the body 100. These locations typically need to be connected to the internal structure of the battery pack or are the main stress-bearing locations supporting the battery module. Therefore, adding the reinforcing structure 200 at these locations not only ensures the strength of the battery bracket but also significantly improves its strength with only a small increase in weight. Specifically, the location of the reinforcing structure 200 can be adjusted according to the connection position between the battery bracket and the battery pack and the installation position of the battery module in actual use. The reinforcing structure 200 may be provided with screw holes to fix the battery bracket to the crossbeam 620 of the battery pack housing 600, thereby connecting the battery bracket to the battery pack housing 600.

[0043] The first reinforcing beam 210 and the second reinforcing beam 220 can be implemented in various ways, such as being made of solid metal materials or directly fabricated from profiles such as square steel or angle steel. To minimize weight, they can also be made by bending thin metal sheets, as shown in the figure. The lower side of the first reinforcing beam 210 or the second reinforcing beam 220 can have a groove or an inner cavity. The first reinforcing beam 210 and the second reinforcing beam 220 can be connected to the body 100 by means of fasteners such as screws or pins. As a preferred implementation, welding can be used for connection. Welded connections have higher strength and more stable connections, and can also avoid the problem of large local stress at the connection point when using fasteners.

[0044] To further enhance the emission of high-temperature gases generated by the second battery module 500, such as Figure 5As shown, the first reinforcing beam 210 encloses an inner space. The side of the first reinforcing beam 210 facing the inner space is the first side, and the side away from the inner space is the second side. The first reinforcing beam 210 is provided with an exhaust structure, which is used to connect the first side and the second side to exhaust high-temperature gas from the first side to the second side.

[0045] Specifically, the exhaust structure includes an exhaust hole 211 that extends through the first reinforcing beam 210 along its width direction.

[0046] like Figure 1-3 As shown, since the body 100 can be configured as a long, thin plate-like structure, the center of the body 100 is prone to bending due to the need to bear a large weight. To further enhance the structural strength at this location, the reinforcing structure 200 also includes an inner reinforcing beam 230. The bottom of the second reinforcing beam 220 is provided with a groove, and the inner reinforcing beam 230 is embedded in the groove to enhance the structural strength of the second reinforcing beam 220. The inner reinforcing beam 230 can be implemented in various ways. For example, the inner reinforcing beam 230 can be a metal strip arranged along the extension direction of the second reinforcing beam 220 and attached to the inner wall of the groove. Another example is that the inner reinforcing beam 230 can include multiple segments spaced apart along the extension direction of the groove, each segment of the inner reinforcing beam 230 extending along the inner wall of the groove and attached to the inner wall of the groove. Yet another example is... Figure 3-5 As shown, the shape of the inner reinforcing beam 230 matches the groove and is embedded within the groove.

[0047] Typically, other components can be installed on the main body 100 according to actual conditions or to avoid the placement of other components in the battery pack. The second reinforcing beam 220 includes two main beams 221 and a connecting beam 222 connecting the two main beams 221. One end of the two main beams 221 is set to gradually approach each other along the extension direction, which is similar to an "A" shape. The main body 100 is provided with an opening at the end of the two main beams 221 that gradually moves away from each other. The main beams 221 can avoid the opening by adopting the setting method in the above technical solution. In actual use, the second reinforcing beam 220 can be set to an "H" shape or other shapes as needed.

[0048] As an optional implementation method, such as Figure 1 , Figure 3 as well as Figure 6 As shown, the battery bracket also includes a first connector 150 and a second connector 160. The first connector 150 is disposed at the module mounting position 130 and is used to fix the first battery module 400 to the module mounting position 130. The second connector 160 is disposed on the body 100 and is used to connect the battery bracket and the battery pack housing 600.

[0049] Multiple first connectors 150 may be provided, and such as Figure 1 , Figure 3 as well as Figure 6 As shown, the first battery module 400 is fixed to the body 100 by the first connector 150 at the four corners of the module mounting position 130. Furthermore, the first connector 150 may be provided corresponding to the reinforcing structure 200.

[0050] The second connector 160 may also be provided along the edge of the main body 100 for connecting the battery bracket to the battery pack housing 600. The second connector 160 can have various implementations, such as snap-fit ​​fasteners or bolt mounting seats that engage with the internal structure of the battery pack housing 600. Specifically, it may have multiple mounting holes penetrating the main body 100 and the reinforcing structure 200, with the second connector 160 positioned at these holes to reinforce the structure. In this case, the second connector 160 can be a bolt mounting seat, and the battery bracket is fixed to the internal structure of the battery pack 600, such as the crossbeam 620 within the battery pack 600, by bolts passing through the mounting holes and the second connector 160. The second connector 160 may be positioned at mounting holes in key stress areas to reduce the weight of the battery bracket.

[0051] In addition, such as Figure 6 As shown, both the first connector 150 and the second connector 160 are provided with rib structures 151 to enhance their structural strength. Both the first connector 150 and the second connector 160 can be thin-walled parts manufactured by sheet metal processing. To enhance their strength, rib structures 151 can be formed by adding protrusions or recesses at the bends, thereby improving the structural strength of the first connector 150 and the second connector 160 and preventing cracking due to vibration during long-term use.

[0052] To further improve the load-bearing capacity of the first connector 150 and the second connector 160, such as Figure 3 as well as Figure 5 As shown, the battery bracket also includes a first reinforcing block and a second reinforcing block 300. The first reinforcing block is correspondingly disposed below the first connector 150 to support the first connector 150, and the second reinforcing block 300 is correspondingly disposed below the second connector 160 to support the second connector 160. The first reinforcing block and the second reinforcing block 300 can be fixed by welding. The first reinforcing block and the second reinforcing block 300 are mainly used to improve the load-bearing capacity of the first connector 150 and the second connector 160 in the direction perpendicular to the reinforcing beam.

[0053] The battery pack provided by this invention, such as Figure 7As shown, the battery pack includes a battery pack housing 600, a first battery module 400, a second battery module 500, and a battery bracket as described in the above technical solution. A pressure relief valve 610 is installed on the battery pack housing 600, and the battery bracket is fixedly installed inside the battery pack housing 600. Specifically, multiple crossbeams 620 may be installed inside the battery pack housing 600, and the battery bracket is fixed to the crossbeams 620. The battery bracket allows the battery modules to be stacked within the battery pack, increasing the battery pack's capacity. It also allows for the timely release of high-temperature gases generated when thermal runaway occurs within the battery modules, preventing chain reactions and improving the safety of the battery pack.

[0054] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A battery bracket, wherein the battery bracket is used to fix a first battery module to one side of a second battery module along a first direction, characterized in that, The second battery module is provided with a vent. The battery bracket includes a body, on which a venting channel, a flow guiding structure, and a module mounting position for fixing the first battery module are provided. The body includes a first surface facing the first battery module and a second surface facing the second battery module. The exhaust channel includes an outlet on the first surface and an inlet on the second surface. The exhaust channel is connected to the exhaust port of the second battery module. The module mounting position is located on the first surface, and the outlet of the exhaust channel is offset from the module mounting position. The flow guiding structure is correspondingly disposed at the outlet of the exhaust channel to guide the high-temperature gas discharged from the second battery module through the exhaust channel to the pressure relief valve of the battery pack. The flow guiding structure includes a back plate and two side plates. The back plate is disposed on the side of the exhaust channel outlet away from the pressure relief valve and is inclined from bottom to top toward the side closer to the pressure relief valve. The two side plates are disposed opposite to each other on both sides of the back plate and are connected to the back plate.

2. The battery holder of claim 1, wherein, The airflow guiding structure also includes a front plate, which is disposed on the side opposite to the back plate at the air outlet of the exhaust channel, and the front plate and the back plate are arranged parallel to each other.

3. The battery holder of claim 1, wherein, The body also includes a reinforcing rib disposed at the module mounting position. The reinforcing rib is recessed relative to the second surface of the body and protrudes relative to the first surface of the body to enhance the structural strength of the body.

4. The battery holder of claim 3, wherein, The portion of the reinforcing rib that is recessed relative to the second surface of the body is connected to the exhaust channel to guide the high-temperature gas discharged from the second battery module to the exhaust channel.

5. The battery holder of claim 1, wherein, The battery bracket also includes a reinforcing structure for supporting the body. The reinforcing structure is disposed on the second surface of the body and includes a first reinforcing beam disposed around the edge of the second surface of the body and a second reinforcing beam disposed in the middle of the body.

6. The battery holder of claim 5, wherein, The first reinforcing beam encloses an inner space. The side of the first reinforcing beam facing the inner space is the first side, and the side away from the inner space is the second side. The first reinforcing beam is provided with an exhaust structure, which is used to connect the first side and the second side to exhaust high-temperature gas from the first side to the second side.

7. The battery holder according to claim 6, characterized in that, The exhaust structure includes an exhaust hole that extends through the first reinforcing beam along its width.

8. The battery holder according to claim 5, characterized in that, The reinforcing structure also includes an inner reinforcing beam, and the bottom of the second reinforcing beam is provided with a groove. The inner reinforcing beam is embedded in the groove to enhance the structural strength of the second reinforcing beam.

9. The battery holder according to claim 5, characterized in that, The second reinforcing beam includes two main beams and a connecting beam between the two main beams, with one end of each main beam gradually moving closer to the other along the extension direction.

10. The battery holder according to claim 5, characterized in that, The battery bracket further includes a first connector and a second connector. The first connector is disposed at the module mounting position and is used to fix the first battery module to the module mounting position. The second connector is disposed on the main body and is used to connect the battery bracket and the battery pack.

11. The battery holder according to claim 10, characterized in that, Both the first connector and the second connector are provided with rib structures to enhance their structural strength.

12. The battery holder according to claim 10, characterized in that, The battery bracket further includes a first reinforcing block and a second reinforcing block. The first reinforcing block is disposed below the first connector to support the first connector, and the second reinforcing block is disposed below the second connector to support the second connector.

13. A battery pack, characterized in that, The battery pack includes a battery pack housing, a first battery module, a second battery module, and a battery bracket as described in any one of claims 1-12, wherein a pressure relief valve is provided on the battery pack housing, and the battery bracket is fixedly disposed within the battery pack housing.

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