Battery module and automobile

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery module and an automobile, the battery module comprises a box body, a battery cell, a box cover and a supporting piece, and the box body is concavely provided with an accommodating groove; the plurality of battery cells are arranged side by side in the first direction to form a battery cell group, and the battery cell group is arranged in the accommodating groove; the box cover is used for blocking a notch of the containing groove. The supporting piece is arranged between the box cover and the battery cell group, a pressure relief groove is formed in the supporting piece, the supporting piece comprises a base plate and a first reinforcing part, the first reinforcing part is arranged on the side, facing the box cover, of the base plate, the first reinforcing part abuts against the box cover, at least part of the pressure relief groove is formed in the first reinforcing part, and the pressure relief valves of all the battery cells are communicated with the pressure relief groove. According to the battery module disclosed by the utility model, through the arrangement of the supporting piece, the first reinforcing part can effectively reinforce the supporting of the box cover, so that the supporting strength of the box cover is improved, the situation of deformation caused by treading of a driver is prevented, and the product quality of the battery module is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery module and an automobile. Background Art

[0002] China is currently in the period of vehicle energy conversion, and new energy vehicles are increasing day by day. Lithium-ion powered vehicles are one of the representatives of new energy vehicles. The key technology of lithium-ion powered vehicles is lithium-ion batteries, and their design needs to consider many factors. On the one hand, it is necessary to ensure that the battery performance meets the requirements of the vehicle. On the other hand, it is necessary to ensure that the battery has sufficient safety and reliability.

[0003] Currently, due to factors such as weight reduction and cost reduction, the battery module is usually directly integrated on the vehicle frame, and the cover of the battery module is used as the floor of the vehicle passenger compartment. However, since passengers will step on it in the vehicle, using the cover as the floor of the vehicle passenger compartment usually has the problem of insufficient support strength and being easily deformed by stepping on, and the product quality is difficult to guarantee. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a battery module and an automobile, which have a simple structure and strong support for the cover.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] In the first aspect, a battery module is provided, which includes a box body, battery cells, a cover and a support member. The box body is recessed with a receiving groove; a plurality of the battery cells are arranged side by side in a first direction to form a battery cell group, and the battery cell group is arranged in the receiving groove; the cover is used to block the notch of the receiving groove; the support member is arranged between the cover and the battery cell group. A pressure relief groove is arranged on the support member, and the length of the pressure relief groove extends along the first direction. The support member includes a base plate and a first strengthening portion. The first strengthening portion is arranged on the side of the base plate facing the cover, and the first strengthening portion abuts against the side surface of the cover close to the battery cell group. The length of the first strengthening portion extends along the first direction. At least part of the pressure relief groove is arranged in the first strengthening portion, and the pressure relief valves of all the battery cells communicate with the pressure relief groove.

[0007] As a preferred solution of the battery module, the support member further includes a second strengthening portion. At least one second strengthening portion is respectively arranged at both ends of the base plate adjacent to the battery cell group along a second direction, and the length of the second strengthening portion extends along the first direction. The second strengthening portion abuts against the side surface of the cover close to the battery cell group, wherein the first direction and the second direction are arranged at an included angle.

[0008] As a preferred solution of the battery module, the substrate, the first reinforcing portion and the second reinforcing portion are integrally formed; or,

[0009] the substrate, the first reinforcing portion and the second reinforcing portion are detachably connected.

[0010] As a preferred solution of the battery module, a first glue groove is recessed on one side of the first reinforcing portion and / or the second reinforcing portion facing the box cover, the length of the first glue groove extends along the first direction, and the first glue groove is used for accommodating structural glue; and / or,

[0011] a plurality of second glue grooves are provided on one side of the substrate facing the battery cell group, the length of the second glue groove extends along the first direction, and the second glue groove is used for accommodating structural glue.

[0012] As a preferred solution of the battery module, the substrate and the first reinforcing portion are detachably connected, the first reinforcing portion includes a main body portion and a connecting portion, the length of the main body portion extends along the first direction, a pressure relief groove is provided on one side of the main body portion facing the battery cell group, connecting portions are respectively protruded on both sides of the main body portion along the second direction, the connecting portion is detachably connected to the substrate, a plurality of communication ports are penetrated through the substrate, and the pressure relief valve is communicated with the pressure relief groove through the communication ports.

[0013] As a preferred solution of the battery module, a limiting groove is recessed on the substrate, and the length of the limiting groove extends along the first direction. One end of the connecting portion and the main body portion adjacent to the battery cell group are bonded to the bottom of the limiting groove. A plurality of the communication ports are penetrated through the bottom of the limiting groove, and the projection of the communication port along the third direction is located in the pressure relief groove. Each pressure relief valve of each battery cell is correspondingly provided with a communication port, wherein the first direction, the second direction and the third direction are arranged at an angle to each other.

[0014] As a preferred solution of the battery module, the length of the pressure relief groove extends along the first direction and penetrates at least one side surface of the support member arranged along the first direction.

[0015] As a preferred solution of the battery module, the substrate and the first reinforcing portion are integrally formed, the pressure relief groove is provided on one side of the substrate facing the battery cell group, and the depth of the pressure relief groove extends into the first reinforcing portion along the third direction, wherein the first direction, the second direction and the third direction are arranged at an angle to each other.

[0016] As a preferred solution of the battery module, the battery module also includes a conductive sheet, the support member is an insulating support member, a mounting opening is provided on the support member relative to the pole position of the battery cell, the conductive sheet is arranged on the support member, and part of the guide sheet passes through the mounting opening to connect to the pole of the battery cell.

[0017] As a preferred solution of the battery module, the support member abuts against the battery cell group; and / or,

[0018] The battery module further includes a mounting beam, the mounting beams are disposed on both sides of the battery cell group along the first direction, and the length of the mounting beams extends along the second direction, the support member is connected to the mounting beam, wherein the first direction and the second direction are disposed at an angle; and / or,

[0019] The battery module also includes mica paper, and the mica paper is pasted in the pressure relief groove.

[0020] As a preferred solution of the battery module, the battery module also includes a mounting beam and foam, the mounting beams are arranged on both sides of the battery cell group along the first direction, and the length of the mounting beam extends along the second direction, the support member is connected to the mounting beam, the foam is arranged on the mounting beam, and the foam abuts against the box cover on a side away from the mounting beam, wherein the first direction is arranged at an angle to the second direction.

[0021] In a second aspect, a car is provided, comprising a frame and a battery module as described above, wherein the battery module is detachably connected to the bottom of the frame, and a cover of the battery module serves as a floor of the car.

[0022] The beneficial effects of the utility model are as follows: by arranging the support member, the first reinforcement part can effectively strengthen the support for the box cover, thereby improving the support strength of the box cover, reducing the deformation amplitude caused by the driver's stepping on it, and ensuring the product quality of the battery module; by arranging the pressure relief groove on the support member, and the pressure relief groove is always partially arranged in the first reinforcement part, on the one hand, the weight of the support member can be reduced, and the use of materials can be reduced to achieve cost reduction. On the other hand, the pressure relief groove is connected to the pressure relief valve of the battery cell, so that high-temperature gas and flame can be discharged from the pressure relief channel when the battery cell thermally runs away, reducing the occurrence of thermal runaway of the battery module caused by blockage of the pressure relief valve, and improving the safety of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The utility model is further described in detail below based on the drawings and embodiments.

[0024] Figure 1 It is a structural schematic diagram of a battery module of an embodiment of the utility model;

[0025] Figure 2 is a cross-sectional view of the battery module according to an embodiment of the present utility model;

[0026] Figure 3 is an exploded view of the battery module according to an embodiment of the present utility model;

[0027] Figure 4 is a schematic structural view of a support member according to an embodiment of the present utility model;

[0028] Figure 5 is a schematic structural view of a support member according to another embodiment of the present utility model;

[0029] Figure 6 is an exploded view of a support member according to another embodiment of the present utility model;

[0030] Figure 7 is Figure 6 an enlarged schematic view of portion A in

[0031] Figure 8 is Figure 6 an enlarged schematic view of portion B in

[0032] In the figure:

[0033] 1, box body; 11, receiving groove; 2, battery cell; 20, battery cell group; 3, box cover; 4, support member; 41, pressure relief groove; 42, substrate; 43, first strengthening portion; 431, main body portion; 432, connecting portion; 44, second strengthening portion; 45, first glue groove; 46, communication port; 47, limiting groove; 48, mounting port; 5, structural adhesive; 6, conductive sheet; 7, mounting beam; 8, vehicle frame. Detailed implementation manners

[0034] The present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only parts related to the present utility model rather than all structures are shown in the drawings.

[0035] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0037] In the description of the present embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operations, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0038] As Figure 1 、 Figure 2 and Figure 3 shown, the battery module of the embodiment of the present utility model includes a box body 1, battery cells 2, a box cover 3 and a support member 4. The box body 1 is recessed with a receiving groove 11; a plurality of battery cells 2 are arranged side by side along a first direction to form a battery cell group 20 (the first direction is the X direction shown in the figure), and the battery cell group 20 is arranged in the receiving groove 11; the box cover 3 is used to seal the notch of the receiving groove 11; the support member 4 is arranged between the box cover 3 and the battery cell group 20. A pressure relief groove 41 is arranged on the support member 4, and the length of the pressure relief groove 41 extends along the first direction and penetrates through both sides of the support member 4 along the first direction. The support member 4 includes a substrate 42 and a first reinforcing portion 43. The first reinforcing portion 43 is arranged on the side of the substrate 42 facing the box cover 3, and the first reinforcing portion 43 abuts against one side surface of the box cover 3 close to the battery cell group 20. The length of the first reinforcing portion 43 extends along the first direction, at least part of the pressure relief groove 41 is arranged in the first reinforcing portion 43, and the pressure relief valves of all the battery cells 2 communicate with the pressure relief groove 41.

[0039] It can be understood that, through the provision of the support member 4, the first reinforcement portion 43 can effectively strengthen the support for the box cover 3, thereby improving the supporting strength of the box cover 3, reducing the deformation amplitude caused by the driver's stepping on it, and ensuring the product quality of the battery module; by providing a pressure relief groove 41 on the support member 4, and the pressure relief groove 41 is always partially provided in the first reinforcement portion 43, on the one hand, the weight of the support member 4 can be reduced, and the use of materials can be reduced to achieve cost reduction. On the other hand, the pressure relief groove 41 is connected to the pressure relief valve of the battery cell 2, so that when the battery cell 2 is thermally runaway, the high-temperature gas and flame can be discharged from the pressure relief channel in time, reducing the occurrence of thermal runaway of the battery module caused by blockage of the pressure relief valve, thereby improving the safety of the battery module.

[0040] Optionally, the length of the pressure relief groove 41 extends along the first direction and penetrates at least one side of the support member 4 arranged along the first direction. That is, the pressure relief groove 41 extends along the first direction and penetrates both sides of the support member 4 arranged along the first direction, and both ends of the pressure relief groove 41 along the first direction can be connected to the outside, so that the thermal runaway gas can be discharged in time to avoid accumulation inside the battery module to cause explosion, and the thermal runaway gas discharge effect is good. Of course, the length of the pressure relief groove 41 can also be extended along the first direction and only penetrate one side of the support member 4 arranged along the first direction, that is, one end of the pressure relief groove 41 along the first direction can be connected to the outside for thermal runaway gas discharge. In addition, the length of the pressure relief groove 41 extends along the first direction and does not penetrate the support member 4. A connecting port connecting the outside and the pressure relief groove 41 is opened on the support member 4 for thermal runaway gas discharge. This structural design can effectively ensure the structural strength of the support member 4.

[0041] In this embodiment, if Figure 3 , Figure 4 and Figure 5 As shown, the support member 4 also includes a second reinforcing portion 44, and at least one second reinforcing portion 44 is respectively provided at both ends of the substrate 42 adjacent to the battery group 20 along the second direction (the second direction is the Y direction shown in the figure), and the length of the second reinforcing portion 44 extends along the first direction, and the second reinforcing portion 44 is pressed against a side of the box cover 3 close to the battery group 20, wherein the first direction and the second direction are arranged at an angle. Through the arrangement of the second reinforcing portion 44, the support for the box cover 3 can be strengthened, so that the box cover 3 has multi-point support to ensure the balance of the overall support of the box cover 3. In this embodiment, a second reinforcing portion 44 is respectively provided on both sides of the first reinforcing portion 43 along the second direction to achieve three-point support for the box cover 3. Of course, in other embodiments, when the use of the top structure of the battery group 20 is not affected, multiple second reinforcing portions 44 can be correspondingly arranged to ensure the support of the box cover 3.

[0042] In some embodiments, Figure 4As shown, the substrate 42, the first reinforcing part 43, and the second reinforcing part 44 are integrally formed, for example, integrally injection-molded. The integrally formed structure has high strength and is convenient for production.

[0043] Specifically, when the substrate 42 and the first reinforcing part 43 are integrally formed, the pressure relief groove 41 is arranged on the side of the substrate 42 facing the battery cell group 20, and the depth of the pressure relief groove 41 extends along the third direction into the first reinforcing part 43 (the third direction is the Z direction shown in the figure). Among them, the first direction, the second direction, and the third direction are arranged at an angle to each other. In this embodiment, the first direction, the second direction, and the third direction are perpendicular to each other. This structure is convenient for forming, has strong integrity, and effectively improves the production efficiency of the support member 4.

[0044] In some other embodiments, such as Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the substrate 42, the first reinforcing part 43, and the second reinforcing part 44 are detachably connected. The split-type setting makes the production difficulty of each part relatively low, the production is convenient, and the later maintenance and replacement costs are relatively low.

[0045] Exemplarily, the first reinforcing part 43 and the second reinforcing part 44 are respectively glued to the substrate 42. The glued connection is stable and convenient for disassembly and assembly. In addition, the first reinforcing part 43 and the second reinforcing part 44 can also be a bracket formed by extrusion molding with a combined material of glass fiber and epoxy resin, which has good flame retardancy and higher strength.

[0046] Optionally, when the substrate 42 and the first reinforcing part 43 are detachably connected, the first reinforcing part 43 includes a main body part 431 and a connecting part 432. The length of the main body part 431 extends along the first direction. A pressure relief groove 41 is recessed on the side of the main body part 431 facing the battery cell group 20. Connecting parts 432 are respectively protruded on both sides of the main body part 431 along the second direction. Preferably, the connecting part 432 is adjacent to the side of the main body part 431 where the pressure relief groove 41 is opened. The connecting part 432 is detachably connected to the substrate 42. A plurality of communication ports 46 are penetrated through the substrate 42. The pressure relief valve is communicated with the pressure relief groove 41 through the communication ports 46. The structure of the first reinforcing part 43 is simple and the connection is convenient. When the battery cell 2 has a thermal runaway, the high-pressure thermal runaway gas can break through the pressure relief valve, pass through the communication ports 46, and enter the pressure relief groove 41 for pressure relief. In this embodiment, the first reinforcing part 43 is connected to the substrate 42 by gluing. A third glue groove is arranged at the bottom side of the connecting part 432 of the first reinforcing part 43. The third glue groove is used to accommodate the structural glue 5. Through the arrangement of the third glue groove, the structural glue 5 can be limited and the offset of the structural glue 5 can be reduced.

[0047] Of course, in order to reduce the weight when the second reinforcement part 44 is set independently, the second reinforcement part 44 can be set to be hollow, that is, a through groove is set in the second reinforcement part 44, and the through groove extends along the first direction and passes through the second reinforcement part 44 on both sides along the first direction, that is, the second reinforcement part 44 is a tubular structure with a U-shaped cross-section. This structural setting facilitates the molding of the second reinforcement part 44 and consumes less material.

[0048] Furthermore, a limiting groove 47 is recessed on the substrate 42, and the length of the limiting groove 47 extends along the first direction. The connecting portion 432 and one end of the main body 431 adjacent to the battery cell group 20 are both bonded to the bottom of the limiting groove 47. The bottom of the limiting groove 47 is penetrated by a plurality of connecting ports 46, and the projection of the connecting ports 46 along the third direction is located in the pressure relief groove 41. Each pressure relief valve of each battery cell 2 is correspondingly provided with a connecting port 46, wherein the first direction, the second direction and the third direction are arranged at an angle to each other. By setting the limiting groove 47, the limitation of the installation position of the first reinforcement portion 43 can be strengthened, and the installation position accuracy of the first reinforcement portion 43 can be improved, that is, the relative position accuracy of the pressure relief groove 41 and the pressure relief valve of the battery cell 2 can be ensured, and at the same time, the height of the support member 4 along the third direction can be reduced, thereby reducing the overall occupied space of the overall battery module. The number of connecting ports 46 corresponds to the number of battery cells 2 one by one, which can ensure the structural strength of the connection of the substrate 42 on both sides of the connecting ports 46 along the second direction, and can ensure that the pressure relief port of each battery cell 2 is independently connected to the pressure relief channel, avoiding the impact of adjacent battery cells 2 when a battery cell 2 has thermal runaway.

[0049] Furthermore, the first reinforcement part 43 and the second reinforcement part 44 are recessed toward one side of the box cover 3 to form a first glue groove 45, the length of the first glue groove 45 extends along the first direction, and the first glue groove 45 is used to accommodate the structural glue 5. By setting the structural glue 5, the connection strength between the first reinforcement part 43, the second reinforcement part 44 and the box cover 3 can be strengthened, and the gap between the structures can be avoided to cause the subsequent impact, extrusion, etc. of the box cover 3 in a vibration environment, and the structural stability between the reinforcement part and the box cover 3 can be improved. And by setting the first glue groove 45, the structural glue 5 can be limited, the position stability of the structural glue 5 can be improved, and the overflow or offset of the structural glue can be avoided. Of course, in some embodiments, the first glue groove 45 can be set only on the first reinforcement part 43 or only on the second reinforcement part 44.

[0050] In addition, a plurality of second adhesive grooves are provided on the side of the substrate 42 facing the battery cell group 20, the length of the second adhesive grooves extends along the first direction, and the second adhesive grooves are used to accommodate the structural adhesive 5. The structural adhesive 5 is used to enhance the connection strength between the substrate 42 and the battery cell group 20, reduce the shaking gap between the support member 4 and the battery cell group 20, and at the same time, the structural adhesive 5 can be used to connect the battery cells 2 in the battery cell group 20 as a whole, reduce the shaking between the battery cells 2, and improve the overall structural stability of the battery module.

[0051] It should be noted that when the second reinforcing part 44 is detachably arranged with the substrate 42, in addition to arranging a second glue groove on the side of the substrate 42 facing the battery cell group 20, a second glue groove can also be arranged on the side of the second reinforcing part 44 facing the battery cell group 20, so that the second reinforcing part 44 is connected to the battery cell group 20, the substrate 42 and the box cover 3 integrally through the structural adhesive 5, improving the connection strength and position stability of the second reinforcing part 44.

[0052] In this embodiment, the battery module further includes a conductive sheet 6. The support member 4 is an insulating support member. An installation opening 48 is penetrated through the support member 4 at a position corresponding to the pole post of the battery cell 2. The conductive sheet 6 is arranged on the support member 4, and a part of the guide sheet passes through the installation opening 48 to connect the pole post of the battery cell 2. By setting the support member 4 as an insulating support member, the conductive sheet 6 used for series or parallel connection between the battery cells 2 can be installed on the support member 4, that is, the support member 4 is used as an isolation board of the battery module CCS (Cell Connection System) for installing the conductive sheet 6 and the sampling wire harness, improving the use functionality of the support member 4.

[0053] Optionally, as Figure 1 and Figure 2 shown, mounting beams 7 are arranged on both sides of the battery cell group 20 along the first direction, and the length of the mounting beam 7 extends along the second direction. The support member 4 is connected to the mounting beam 7, wherein the first direction and the second direction are arranged at an angle. Through the arrangement of the mounting beam 7, it is convenient to strengthen the support strength of the support member 4, thereby ensuring the support strength of the support member 4 for the box cover 3. In this embodiment, the dimension of the mounting beam 7 along the third direction is the same as the dimension of the battery cell 2 along the third direction, that is, the support member 4 abuts against the battery cell group 20 and the mounting beam 7 at the same time, which can ensure the overall structural support of the support member 4.

[0054] Furthermore, when the battery module is provided with the mounting beam 7, the battery module further includes a foam. The foam is arranged on the mounting beam 7, and the side of the foam away from the mounting beam 7 abuts against the box cover 3. Through the arrangement of the foam, the support for the box cover 3 can be further strengthened by using the mounting beam 7, improving the support strength of the box cover 3.

[0055] Preferably, the battery module further includes mica paper. Mica paper is pasted in the pressure relief groove 41. Mica paper has electrical insulation, high temperature resistance and corrosion resistance properties, effectively preventing the spread of the flame ejected by the pressure relief valve when the battery cell 2 is out of control thermally, improving the overall use safety of the battery module.

[0056] As Figures 1 to 8As shown in the figure, an embodiment of the present utility model further provides an automobile, which includes a vehicle frame 8 and a battery module as described in any of the above embodiments. The battery module is detachably connected to the bottom of the vehicle frame 8, and the cover 3 of the battery module serves as the floor of the automobile. Through the arrangement of the support member 4 of the battery module, the first strengthening portion 43 can effectively strengthen the support for the cover 3, thereby improving the support strength of the cover 3, that is, improving the strength of the floor of the automobile, preventing the deformation caused by the driver stepping on it, and ensuring the product quality of the automobile.

[0057] Obviously, the above embodiments of the present utility model are merely examples for clearly explaining the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the claims of the present utility model.

Claims

1. A battery module, characterized in that: include: A box body, wherein the box body is concavely provided with a receiving groove; A battery cell, wherein a plurality of the battery cells are arranged side by side along a first direction to form a battery cell group, and the battery cell group is arranged in the receiving groove; A box cover, the box cover is used to block the notch of the containing tank; A support member, wherein the support member is arranged between the box cover and the battery cell group, the support member is provided with a pressure relief groove, the length of the pressure relief groove extends along the first direction, the support member comprises a base plate and a first reinforcement portion, the base plate is provided with the first reinforcement portion protruding toward the box cover, the first reinforcement portion is pressed against a side surface of the box cover close to the battery cell group, the length of the first reinforcement portion extends along the first direction, at least part of the pressure relief groove is arranged in the first reinforcement portion, and the pressure relief valves of all the battery cells are communicated with the pressure relief groove.

2. The battery module according to claim 1, characterized in that: The support member also includes a second reinforcement portion, and at least one second reinforcement portion is respectively provided at two end positions of the substrate adjacent to the battery cell group along the second direction, and the length of the second reinforcement portion extends along the first direction, and the second reinforcement portion is used to press against a side surface of the box cover close to the battery cell group, wherein the first direction and the second direction are arranged at an angle.

3. The battery module according to claim 2, characterized in that: The substrate, the first reinforcement portion and the second reinforcement portion are integrally formed; or, The base plate, the first reinforcement portion, and the second reinforcement portion are detachably connected.

4. The battery module according to claim 2, characterized in that: The first reinforcement part and / or the second reinforcement part is recessed toward one side of the box cover to form a first glue groove, the length of the first glue groove extends along the first direction, and the first glue groove is used to accommodate structural glue; and / or, A plurality of second glue grooves are arranged on one side of the substrate facing the battery cell group. The lengths of the second glue grooves extend along the first direction. The second glue grooves are used to accommodate structural glue.

5. The battery module according to claim 2, characterized in that: The substrate and the first reinforcement part are detachably connected, the first reinforcement part includes a main body and a connecting part, the main body extends along the first direction, the pressure relief groove is provided on the side of the main body facing the battery cell group, the connecting parts are protrudingly provided on both sides of the main body along the second direction, the connecting parts are detachably connected to the substrate, a plurality of connecting ports are penetrated on the substrate, and the pressure relief valve is connected with the pressure relief groove through the connecting ports.

6. The battery module according to claim 5, characterized in that: A limiting groove is recessed on the substrate, and the length of the limiting groove extends along the first direction. The connecting portion and one end of the main body adjacent to the battery cell group are both bonded to the bottom of the limiting groove. A plurality of connecting ports are provided through the bottom of the limiting groove, and the projection of the connecting ports along the third direction is located in the pressure relief groove. The pressure relief valve of each battery cell is correspondingly provided with a connecting port, wherein the first direction, the second direction and the third direction are arranged at angles to each other.

7. The battery module according to claim 2, characterized in that: The substrate and the first reinforcement portion are integrally formed, the pressure relief groove is arranged on the side of the substrate facing the battery cell group, and the depth of the pressure relief groove extends into the first reinforcement portion along the third direction, wherein the first direction, the second direction and the third direction are arranged at an angle to each other.

8. The battery module according to any one of claims 1 to 7, characterized in that: The length of the pressure relief groove extends along the first direction and passes through at least one side surface of the support member arranged along the first direction.

9. The battery module according to any one of claims 1 to 7, characterized in that: The battery module also includes a conductive sheet, the support member is an insulating support member, a mounting opening is provided on the support member relative to the pole position of the battery cell, the conductive sheet is provided on the support member, and part of the conductive sheet passes through the mounting opening to connect to the pole of the battery cell.

10. The battery module according to any one of claims 1 to 7, characterized in that: The support member abuts against the battery cell group; and / or, The battery module further includes a mounting beam, the mounting beams are disposed on both sides of the battery cell group along the first direction, and the length of the mounting beams extends along the second direction, the support member is connected to the mounting beam, wherein the first direction and the second direction are disposed at an angle; and / or, The battery module also includes mica paper, and the mica paper is pasted in the pressure relief groove.

11. The battery module according to any one of claims 1 to 7, characterized in that: The battery module also includes a mounting beam and foam. The mounting beams are arranged on both sides of the battery cell group along the first direction, and the length of the mounting beam extends along the second direction. The support member is connected to the mounting beam, and the foam is arranged on the mounting beam. The side of the foam away from the mounting beam abuts against the box cover, wherein the first direction and the second direction are arranged at an angle.

12. A car, characterized in that: It comprises a vehicle frame and a battery module as claimed in any one of claims 1 to 11, wherein the battery module is detachably connected to the bottom of the vehicle frame, and the box cover of the battery module is the bottom plate of the vehicle.

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