Battery module and vehicle

Abstract

Battery module, including: a box body (1) which is provided with a concave receiving groove (11); several cells (2) arranged side by side along a first direction to form a cell group (20) arranged in the receiving groove (11); a box lid (3) configured to close the opening of the receiving groove (11); a support piece (4) arranged between the box lid (3) and the cell group (20), wherein the support piece (4) is provided with a pressure relief groove (41) the length of which extends along the first direction, wherein the support piece (4) comprises a substrate (42) and a first reinforcement section (43), and wherein the substrate (42) is provided on a side facing the box lid (3) with the first reinforcement section (43) projecting upwards, the first reinforcement section (43) abutting a side of the box lid (3) facing the cell group (20), wherein the length of the first reinforcement section (43) extends along the first direction, wherein at least a part of the pressure relief groove (41) is arranged in the first reinforcement section (43), and wherein pressure relief valves of all the cells (2) are connected to the pressure relief groove (41).

Description

AREA OF USE PATTERN

[0001] The present utility model relates to the technical field of batteries, for example a battery module and a vehicle. STATE OF THE ART

[0002] Vehicles are undergoing an energy transition. The number of vehicles powered by new energy sources is increasing daily, and lithium-ion vehicles are among the leading examples. The key technology in lithium-ion vehicles is lithium-ion batteries, and their design requires careful consideration of numerous factors to ensure both that the battery performance meets the vehicle's requirements and that the battery offers sufficient safety and reliability. DISCLOSURE OF THE USE SAMPLE Technical Problem

[0003] For reasons of weight reduction, cost savings, and other factors, a battery module is typically integrated directly into the vehicle frame, and the battery module's cover is used as the floor of the passenger compartment. However, because occupants step onto the vehicle and the cover serves as the passenger compartment floor, the cover is prone to deformation due to insufficient support, making product quality difficult to guarantee. Technical solution

[0004] The utility model provides a battery module and a vehicle and is characterized by a simple structure and strong support of the box lid.

[0005] In a first aspect, a battery module is provided. It comprises: a box body, cells, a box lid, and a support piece. The box body is provided with a concave receiving groove; the multiple cells are arranged side by side along a first direction to form a cell group that is positioned in the receiving groove; the box lid is configured to close the opening of the receiving groove;The support piece is arranged between the box lid and the cell group, the support piece being provided with a pressure relief groove the length of which extends along the first direction, the support piece comprising a substrate and a first reinforcement section, and the substrate being provided with the first reinforcement section projecting from a side facing the box lid, the first reinforcement section bearing against a side of the box lid facing the cell group, the length of the first reinforcement section extending along the first direction, at least a part of the pressure relief groove being arranged in the first reinforcement section, and pressure relief valves of all the cells being connected to the pressure relief groove.

[0006] In a second aspect, a vehicle is provided. It comprises a vehicle frame and a battery module as described in the first aspect, wherein the battery module is detachably connected to the underside of the vehicle frame and the box lid of the battery module forms a floor plate of the vehicle. Beneficial effects

[0007] Advantageous effects of the utility model: The arrangement of the support piece allows the first reinforcement section to effectively strengthen the support of the box lid, thereby improving the support strength of the box lid, reducing the deformation amplitude caused by the rider's pedaling, and ensuring the product quality of the battery module. By providing the pressure relief groove on the support piece, and always partially integrating it into the first reinforcement section, the weight of the support piece can be reduced, and material usage can be minimized, resulting in cost savings. Furthermore, the pressure relief groove is connected to the cell's pressure relief valve, allowing high-temperature gas and flames to be discharged from the pressure relief channel in the event of thermal runaway in the cell.The situation where the thermal spread of the battery module is reduced due to the blockage of the pressure relief valve is reduced, and the operational safety of the battery module is improved. Representation of the utility model

[0008] This shows Fig. 1 a schematic structural view of a battery module according to an embodiment of the present utility model; Fig. 2 a sectional view of the battery module according to an embodiment of the present utility model; Fig. 3 an exploded view of the battery module according to an embodiment of the present utility model; Fig. 4 a schematic structural view of a support piece according to an embodiment of the present utility model; Fig. 5 a schematic structural view of the support piece according to another embodiment of the present utility model; Fig. 6 an exploded view of the support element according to another embodiment of the present utility model; Fig. 7 the position A according to Fig. 6 in an enlarged view; Fig. 8 the position B according to Fig. 6 in an enlarged view. Reference symbol:

[0009] 1. Box body; 11. Receipt groove; 2. Cell; 20. Cell group; 3. Box lid; 4. Support piece; 41. Pressure relief groove; 42. Substrate; 43. First reinforcement section; 431. Main body section; 432. Connecting section; 44. Second reinforcement section; 45. First adhesive groove; 46. Connecting opening; 47. Limiting groove; 48. Mounting opening; 5. Structural adhesive; 6. Conductive sheet; 7. Mounting beam; 8. Vehicle frame. Embodiments of the utility model

[0010] The following section, with reference to the accompanying drawings, describes the present utility model in more detail using an exemplary embodiment. It is understood that the described specific embodiments serve only to explain the utility model and do not limit its scope. Furthermore, it should be noted that, to facilitate the description, the accompanying drawings only show parts related to the utility model, rather than all structures.

[0011] In the description of this utility model, the terms "connected," "connect," "fasten," etc., are to be understood in a broad sense unless expressly stated otherwise. Thus, they can refer, for example, to a permanent, detachable, or one-piece connection, as well as a mechanical or electrical connection. Furthermore, direct connections, indirect connections, connections made via an intermediate piece, and internal connections or interactions between two elements are also conceivable. Those skilled in the art in this field can use the circumstances as a basis to determine the intended meaning of the aforementioned terms according to this utility model.

[0012] In the present utility model, unless expressly stated or defined otherwise, a first feature positioned "above" or "below" a second feature may, among other things, directly touch the second feature, or the first and second features may be in contact without direct contact via an intervening feature. Furthermore, a first feature positioned "on," "above," or "above" the second feature may, among other things, lie directly above or obliquely above the second feature, or the horizontal position of the first feature may be higher than that of the second feature. A first feature positioned "below" or "below" the second feature may, among other things,It may be the case that the first feature lies directly below and diagonally below the second feature, or that the horizontal height of the first feature is lower than that of the second feature.

[0013] In the description of the present embodiment, the terms "top", "bottom", "left", "right", etc. are used in relation to the depicted The terms "orientation" and "position" are used in the respective illustrations solely to describe the operation and, where applicable, to simplify the description. In other words, these terms neither implicitly nor explicitly refer to the positioning, design, and operation of the device or element in question in a predetermined position, so there is no restriction of the application in this respect either. Furthermore, the terms "first" and "second," which have no particular meaning, are used merely to differentiate between the descriptions.

[0014] As in Fig. 1, Fig. 2 and Fig. As shown in Figure 3, the battery module according to one embodiment of the utility model comprises a box body 1, cells 2, a box lid 3, and a support piece 4. The box body 1 is provided with a concave receiving groove 11; the multiple cells 2 are arranged side by side along a first direction (the first direction corresponds to the X direction shown) to form a cell group 20, which is arranged in the receiving groove 11; the box lid 3 is configured to close the opening of the receiving groove 11;The support piece 4 is arranged between the box lid 3 and the cell group 20, the support piece 4 being provided with a pressure relief groove 41 whose length extends along the first direction, the support piece 4 comprising a substrate 42 and a first reinforcement section 43, and the substrate 42 being provided on a side facing the box lid 3 with the first reinforcement section 43 projecting upwards, the first reinforcement section 43 bearing against a side of the box lid 3 facing the cell group 20, the length of the first reinforcement section 43 extending along the first direction, at least a part of the pressure relief groove 41 being arranged in the first reinforcement section 43, and pressure relief valves of all the cells 2 being connected to the pressure relief groove 41.

[0015] The arrangement of the support piece 4 allows the first reinforcement section 43 to effectively reinforce the support of the box lid 3, thereby improving the support strength of the box lid 3, reducing the deformation amplitude caused by the rider's foot pedaling, and ensuring the product quality of the battery module. By providing the pressure relief groove 41 on the support piece 4, and by ensuring that the pressure relief groove 41 is always partially located within the first reinforcement section 43, the weight of the support piece 4 can be reduced, and material usage can be decreased, thus achieving cost savings. Furthermore, the pressure relief groove 41 is connected to the pressure relief valve of cell 2, allowing high-temperature gas and flames to be discharged from the pressure relief channel in the event of thermal runaway at cell 2.The situation where the thermal spread of the battery module is reduced due to the blockage of the pressure relief valve is reduced, and the operational safety of the battery module is improved.

[0016] The pressure relief groove 41 extends along the first direction and passes through at least one side surface of the support element 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 element 4 along the first direction. The two ends of the pressure relief groove 41 along the first direction can communicate with the outside, allowing gas to be released in a timely manner in the event of thermal runaway, thus preventing an explosion caused by gas accumulation inside the battery module and ensuring effective gas venting during thermal runaway. Alternatively, the pressure relief groove 41 can extend along the first direction and penetrate only one side surface of the support element 4 along the first direction.One end of the pressure relief groove 41 along the first direction can be connected to the outside for gas release in the event of thermal runaway. Furthermore, the length of the pressure relief groove 41 extends along the first direction and does not penetrate the support piece 4. The support piece 4 is provided with a connecting opening that communicates with the outside and the pressure relief groove 41 for gas release in the event of thermal runaway. The structural design effectively guarantees the structural strength of the support piece 4.

[0017] As in Fig. 3, Fig. 4 and Fig. As shown in Figure 5, the support element 4 in the present embodiment further comprises a second reinforcing section 44, wherein the substrate 42 is provided at both its ends along a second direction near the cell group 20 with at least one second reinforcing section 44 (the second direction corresponds to the Y-direction shown), the length of the second reinforcing section 44 extending along the first direction, and the second reinforcing section 44 being arranged such that it abuts a side surface of the box lid 3 facing the cell group 20, the first direction being at an angle to the second direction. The arrangement of the second reinforcing section 44 allows the support of the box lid 3 to be reinforced, so that the box lid 3 is supported at multiple points to ensure the overall stability of the support of the box lid 3.In this embodiment, a second reinforcing section 44 is arranged on both sides of the first reinforcing section 43 along the second direction to provide a three-point support for the box lid 3, and in other embodiments, if the use of the upper structure of the cell group 20 is not affected, a plurality of second reinforcing sections 44 can be arranged accordingly to ensure the support capability of the box lid 3.

[0018] In some embodiments, such as in Fig. As shown in Figure 4, the substrate 42, the first reinforcement section 43 and the second reinforcement section 44 are integrally formed, such as by integrated injection molding, and the strength of the integrally formed structure is high and the manufacturing is convenient.

[0019] In the case of one-piece molding of the substrate 42 and the first reinforcement section 43, the pressure relief groove 41 is arranged on one side of the substrate 42 facing the cell group 20, and the depth of the pressure relief groove 41 extends along the third direction into the first reinforcement section 43 (the third direction corresponds to the Z-direction shown), with the first, second, and third directions being arranged at angles to each other. In the present embodiment, the first, second, and third directions are arranged perpendicular to each other. The structure is suitable for molding, the integrity is strong, and the production efficiency of the support piece 4 is effectively improved.

[0020] In other embodiments, such as in Fig. 5, Fig. 6, Fig. 7 and Fig. As shown in Figure 8, the substrate 42, the first reinforcement section 43, and the second reinforcement section 44 are detachably connected. This segmented arrangement ensures minimal difficulties in manufacturing parts, convenient production, and low maintenance and replacement costs in later stages.

[0021] For example, the first reinforcement section 43 and the second reinforcement section 44 are each bonded to the substrate 42. The adhesive bond is stable, and disassembly and assembly are convenient. Alternatively, an extruded and molded bracket made of a combination of fiberglass and epoxy resin can be used as the first reinforcement section 43 and the second reinforcement section 44. This bracket offers good flame retardancy and higher strength.

[0022] If the substrate 42 and the first reinforcement section 43 are detachably connected, the first reinforcement section 43 comprises a main body section 431 and a connecting section 432, wherein the main body section 431 extends along the first direction and the main body section 431 is provided with a pressure relief groove 41 on a side facing the cell group 20, wherein the main body section 431 is provided on two sides along the second direction with the connecting section 432, which is arranged adjacent to a side of the main body section 431 provided with the pressure relief groove 41, wherein the connecting section 432 is detachably connected to the substrate 42, wherein several connecting openings 46 penetrating the substrate 42 are provided through which the pressure relief valve is connected to the pressure relief groove 41.The first reinforcement section 43 is of simple design and the connection is convenient. In the event of thermal runaway, high-pressure gas can rupture the pressure relief valve if thermal runaway occurs at cell 2 and enters the pressure relief groove 41 through the connection opening 46. In this embodiment, the first reinforcement section 43 is bonded to the substrate 42. The underside of the connection section 432 of the first reinforcement section 43 is provided with a third adhesive groove designed to receive a structural adhesive 5. The arrangement of the third adhesive groove allows the structural adhesive 5 to be contained and reduces its displacement.

[0023] To reduce the weight, if the second reinforcing section 44 is arranged independently, the second reinforcing section 44 can be hollow, i.e., a continuous groove is arranged in the second reinforcing section 44, and the continuous groove extends along the first direction and penetrates both sides of the second reinforcing section 44 along the first direction, i.e., the second reinforcing section 44 is a tubular structure with a -shaped cross-section, and such a structure is suitable for forming the second reinforcement section 44, and the material consumption is lower.

[0024] A concave limiting groove 47 is formed on the substrate 42, the length of which extends along the first direction. An end of the connecting section 432 or the main body section 431 facing the cell group 20 is bonded to the bottom of the limiting groove 47, and the bottom of the limiting groove 47 is provided with a plurality of connecting openings 46 penetrating these openings. The projection of the connecting opening 46 along the third direction lies in the pressure relief groove 41. The pressure relief valve of each cell 2 is accordingly provided with a connecting opening. The first, second, and third directions are arranged at angles to each other. By providing the limiting groove 47, the limitation of the installation position of the first reinforcement section 43 can be increased, and the installation position accuracy of the first reinforcement 43 can be improved.The relative positional accuracy of the pressure relief groove 41 and the pressure relief valve of cell 2 is ensured, and the height of the support piece 4 along the third direction can also be reduced, thus reducing the overall occupied space of the entire battery module. The number of connection openings 46 corresponds one-to-one to the number of cells 2, ensuring the structural strength of the connection of the substrate 42 on both sides of the connection opening 46 along the second direction. Furthermore, it can be ensured that the pressure relief opening of each cell 2 communicates independently with the pressure relief channel to prevent interference with adjacent cells 2 in the event of thermal runaway in one cell 2.

[0025] The first reinforcement section 43 and the second reinforcement section 44 are provided with a concave first adhesive groove 45 on a side facing the box lid 3. The length of the first adhesive groove 45 extends along the first direction and is designed to receive a structural adhesive 5. The presence of the structural adhesive 5 enhances the bond strength between the first reinforcement section 43, the second reinforcement section 44, and the box lid 3, and prevents subsequent impact and pressure on the box lid 3 in a vibrating environment due to a gap between the structures. The structural stability between the reinforcement section and the box lid 3 is improved. The provision of the first adhesive groove 45 limits the amount of structural adhesive 5, improves its positional stability, and prevents issues such as adhesive overflow or displacement.In some embodiments, the first adhesive groove 45 can be arranged only on the first reinforcement section 43 or only on the second reinforcement section 44.

[0026] Furthermore, the substrate 42 is provided with a plurality of secondary adhesive grooves on one side facing the cell group 20, the length of the secondary adhesive groove running along the first direction and the secondary adhesive groove being configured to receive the structural adhesive 5. The structural adhesive 5 increases the bond strength between the substrate 42 and the cell group 20 and reduces the gap between the support element 4 and the cell group 20 when subjected to movement. Simultaneously, the structural adhesive 5 is used to bond the majority of the cells 2 in the cell group 20 into a cohesive unit, thereby reducing the movement of the majority of the cells 2 and increasing the overall structural stability of the battery module.

[0027] If the second reinforcement section 44 and the substrate 42 are detachably arranged, in addition to the arrangement of the second adhesive groove on the side of the substrate 42 facing the cell group 20, a second adhesive groove can also be arranged on a side of the second reinforcement section 44 facing the cell group 20, so that the second reinforcement section 44 is connected to the cell group 20, the substrate 42 and the box lid 3 by the structural adhesive 5 to form a whole, thereby improving the bond strength and positional stability of the second reinforcement section 44.

[0028] In this embodiment, the battery module further comprises a conductive sheet 6, wherein the support 4 is an insulating support, and a mounting opening 48 penetrating the support 4 is provided at a position opposite a terminal of the cell 2. The conductive sheet 6 is arranged on the support 4, and a portion of the conductive sheet 6 extends through the mounting opening 48 to connect to the terminal of the cell 2. By designing the support 4 as an insulating support, the conductive sheet 6, arranged such that the multiple cells 2 are connected in series or parallel, can be installed on the support 4. In other words, the support 4 is used as an insulating plate for the cell connection system (CCS) of the battery module to install the conductive sheet 6 and a sampling cable harness, thereby improving the functionality of the support 4.

[0029] As in Fig. 1 and Fig. As shown in Figure 2, the cell group 20 is provided on two sides along the first direction with a mounting beam 7, the length of which extends along the second direction. The support piece 4 is connected to the mounting beam 7, and the first direction is arranged at an angle to the second direction. By arranging the mounting beam 7 to increase the support strength of the support piece 4, the support strength of the support piece 4 for the box lid 3 is ensured. In this embodiment, the dimensions of the mounting beam 7 along the third direction are consistent with the dimensions of the cell 2 along the third direction; that is, the support piece 4 bears against both the cell group 20 and the mounting beam 7 simultaneously, thus ensuring the overall structural support capability of the support piece 4.

[0030] When the battery module is fitted with the mounting beam 7, the battery module also has a foam insert arranged on the mounting beam 7. One side of the foam insert facing away from the mounting beam 7 rests against the box lid 3. The arrangement of the foam insert allows the mounting beam 7 to be used to reinforce the support of the box lid 3 and improve its structural integrity.

[0031] The battery module also includes a mica paper that is glued in the pressure relief groove 41. The mica paper has electrical insulation, high temperature resistance and corrosion resistance, thus effectively preventing the propagation of the flame sprayed out through the pressure relief valve in the event of thermal runaway of cell 2 and improving the overall safety of the battery module.

[0032] As shown in Figures 1 to 8, the embodiment of the present utility model provides a vehicle. It comprises a vehicle frame 8 and a battery module according to one of the embodiments of the utility model, wherein the battery module is detachably connected to the underside of the vehicle frame 8 and the battery module's housing cover 3 forms a floor panel of the vehicle. By providing the support element 4 of the battery module, the first reinforcing section 43 can effectively strengthen the support of the housing cover 3, thus improving the supporting force of the housing cover 3, i.e., improving the strength of the vehicle's floor panel, preventing deformation caused by the driver's footsteps, and ensuring the product quality of the vehicle.

Claims

[1] Battery module comprising: a box body (1) which is provided with a concave receiving groove (11); several cells (2) arranged side by side along a first direction to form a cell group (20) arranged in the receiving groove (11); a box lid (3) configured to close the opening of the receiving groove (11); a support piece (4) arranged between the box lid (3) and the cell group (20), wherein the support piece (4) is provided with a pressure relief groove (41) the length of which extends along the first direction, wherein the support piece (4) comprises a substrate (42) and a first reinforcement section (43), and wherein the substrate (42) is provided on a side facing the box lid (3) with the first reinforcement section (43) projecting upwards, the first reinforcement section (43) abutting a side of the box lid (3) facing the cell group (20), wherein the length of the first reinforcement section (43) extends along the first direction, wherein at least a part of the pressure relief groove (41) is arranged in the first reinforcement section (43), and wherein pressure relief valves of all the cells (2) are connected to the pressure relief groove (41). [2] Battery module according to claim 1, wherein the support piece (4) further comprises a second reinforcement section (44), wherein the substrate (42) is provided at both its ends along a second direction near the cell group (20) with at least one second reinforcement section (44), wherein the length of the second reinforcement section (44) extends along the first direction and the second reinforcement section (44) is arranged such that it abuts a side surface of the box lid (3) facing the cell group (20), wherein the first direction extends at an angle to the second direction. [3] Battery module according to claim 2, wherein the substrate (42), the first reinforcement section (43) and the second reinforcement section (44) are integrally formed; or wherein the substrate (42), the first reinforcement section (43) and the second reinforcement section (44) are detachably connected to each other. [4] Battery module according to claim 2 or 3, wherein at least one of the following conditions is met: at least one of the components first reinforcement section (43) and second reinforcement section (44) is provided with a first adhesive groove (45) on a side facing the box lid (3) in a concave shape, wherein the length of the first adhesive groove (45) runs along the first direction and the first adhesive groove (45) is designed to receive a structural adhesive (5); the substrate (42) is provided with a plurality of second adhesive grooves on one side facing the cell group (20), wherein the length of the second adhesive groove runs along the first direction and the second adhesive groove is designed to receive the structural adhesive. [5] Battery module according to one of claims 2 to 4, wherein the substrate (42) and the first reinforcement section (43) are detachably connected, wherein the first reinforcement section (43) comprises a main body section (431) and a connecting section (432), wherein the main body section (431) extends along the first direction and the main body section (431) is provided on a side facing the cell group (20) with a pressure relief groove (41), wherein the main body section (431) is provided on two sides along the second direction with the connecting section (432) projecting from each side, wherein the connecting section (432) is detachably connected to the substrate (42), wherein several connecting openings (46) penetrating the substrate (42) are provided through which the pressure relief valve is connected to the pressure relief groove (41). [6] Battery module according to claim 5, wherein a limiting groove (47) is formed concavely on the substrate (42), the length of which extends along the first direction, wherein an end of the connecting section (432) or of the main body section (431) facing the cell group (20) is bonded to the bottom of the limiting groove (47) and the bottom of the limiting groove (47) is provided with a plurality of connecting openings (46) penetrating it, wherein the projection of the connecting opening (46) lies along a third direction in the pressure relief groove (41), wherein the pressure relief valve of each cell (2) is accordingly provided with a connecting opening, wherein the first direction, the second direction and the third direction are arranged at angles to each other. [7] Battery module according to one of claims 2 to 4, wherein the substrate (42) and the first reinforcement section (43) are integrally formed, wherein the pressure relief groove (41) is arranged on a side of the substrate (42) facing the cell group (20) and the depth of the pressure relief groove (41) extends along the third direction into the first reinforcement section (43), wherein the first direction, the second direction and the third direction are arranged at angles to each other. [8] Battery module according to any one of claims 1 to 7, wherein the length of the pressure relief groove (41) extends along the first direction and passes through at least one side surface of the support piece (4) arranged along the first direction. [9] Battery module according to any one of claims 1 to 7, further comprising a conductive sheet (6), wherein the support piece (4) is an insulating support piece, wherein a mounting opening (48) penetrating the support piece (4) is provided at a position of the support piece (4) opposite a pole of the cell (2), wherein the conductive sheet (6) is arranged on the support piece (4) and a part of the conductive sheet (6) extends through the mounting opening (48) to be connected to the pole of the cell (2). [10] Battery module according to any one of claims 1 to 7, wherein at least one of the following conditions is met: the support piece (4) rests against the cell group (20); the battery module further comprises a mounting beam (7), wherein the cell group (20) is provided with the mounting beam (7) on two sides along the first direction, wherein the length of the mounting beam (7) extends along the second direction, wherein the support piece (4) is connected to the mounting beam (7), and wherein the first direction is arranged at an angle to the second direction; The battery module also includes a mica paper which is glued in the pressure relief groove (41). [11] Battery module according to any one of claims 1 to 7, wherein the battery module further comprises a mounting beam (7) and a foam, wherein the cell group (20) is provided on two sides along the first direction with the mounting beam (7), wherein the length of the mounting beam (7) extends along the second direction, wherein the support piece (4) is connected to the mounting beam (7), wherein the foam is arranged on the mounting beam (7) and a side of the foam facing away from the mounting beam (7) rests against the box lid (3), and wherein the first direction is arranged at an angle to the second direction. [12] Vehicle comprising a vehicle frame (8) and a battery module according to any one of claims 1 to 11, wherein the battery module is detachably connected to the underside of the vehicle frame and the box lid (3) of the battery module is a base plate of the vehicle.

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