Battery pack and energy storage system

Abstract

The present application provides a battery pack and an energy storage system. The battery pack comprises: a lower housing, a module unit, and an upper cover. The upper cover is fastened on the lower housing and encloses an accommodating cavity. The module unit is connected to the lower housing and is located in the accommodating cavity. The lower housing comprises: a heat exchange plate, which is provided with a first side and a second side opposite one another in a first direction, the first side of the heat exchange plate being provided with a heat exchange surface for bearing the module unit and exchanging heat with the module unit; a frame connected to the second side of the heat exchange plate; and a support plate abutting against the second side of the heat exchange plate and connected to the frame, the support plate being fixedly connected to the heat exchange plate. The yield strength of the material used for the support plate is greater than the yield strength of the material used for the heat exchange plate. According to the battery pack of the present application, by means of increasing the support strength of the support plate, the bearing upper limit of the support plate is increased, the bearing capacity of the lower housing is effectively increased, and the lower housing can bear a larger module unit, thereby increasing the energy density of the battery pack.

Description

Battery packs and energy storage systems Technical Field

[0001] This application relates to the field of energy storage technology, specifically to a battery pack and energy storage system. Background Technology

[0002] With the development of new energy storage systems, the development direction of batteries is towards larger capacity and larger size. For lithium iron phosphate batteries commonly used in energy storage, the ever-increasing battery capacity has led to a further increase in the size and weight of the batteries themselves.

[0003] In some related technologies, the battery pack typically uses a rectangular lower box that can support two 13-cell battery modules along its length. A middle module beam is set in the middle of the lower box to connect the two battery modules. However, when dealing with heavy batteries or modules with more than 13 cells in each cell, such as 16 or more cells, the load-bearing capacity of the lower box may be insufficient, thus limiting the energy density of the battery pack. Summary of the Invention

[0004] This application aims to at least solve the problem of insufficient load-bearing capacity of the lower casing of the battery pack in the prior art, which limits the energy density of the battery pack, and proposes a battery pack and energy storage system.

[0005] To achieve the purpose of this application, a battery pack is provided, comprising: a lower housing, a module unit, and a top cover, wherein the top cover is fastened to the lower housing and forms a receiving cavity, the module unit is connected to the lower housing and located within the receiving cavity, the lower housing comprising: a heat exchange plate having a first side and a second side disposed opposite to each other in a first direction, the first side of the heat exchange plate having a heat exchange surface for supporting the module unit and exchanging heat with the module unit; a frame connected to the second side of the heat exchange plate; and a support plate abutting against the second side of the heat exchange plate and connected to the frame, the support plate being fixedly connected to the heat exchange plate; wherein the yield strength of the material used for the support plate is greater than the yield strength of the material used for the heat exchange plate.

[0006] In some embodiments, the heat exchange plate is bonded to the support plate.

[0007] In some embodiments, the support plate and the heat exchange plate are made of different materials.

[0008] In some embodiments, the heat exchange plate is made of aluminum alloy, the support plate is made of alloy steel, and the heat exchange plate is riveted to the support plate.

[0009] In some embodiments, the frame is made of the same material as the support plate, the heat exchange plate is riveted to the frame, and the frame is welded to the support plate.

[0010] In some embodiments, the thermal conductivity of the material used for the heat exchange plate is greater than that of the material used for the support plate.

[0011] In some embodiments, a connector is provided on the support plate, the connector is connected to the heat exchange plate, and the support plate is fixedly connected to the heat exchange plate through the connector.

[0012] In some embodiments, the support plate has a plurality of protrusions abutting against a second side of the heat exchange plate, and the connector passes through at least a portion of the protrusions to fix at least a portion of the protrusions to the heat exchange plate.

[0013] In some embodiments, the second side of the heat exchange plate has a plurality of connecting protrusions. Among all the protrusions, some of the protrusions correspond one-to-one with the connecting protrusions and abut against each other. The protrusions and the connecting protrusions that abut against each other are fixedly connected by the connector.

[0014] In some embodiments, the protrusions are in multiple groups, the multiple groups of protrusions are spaced apart in the second direction, the protrusions in the same group are spaced apart in the third direction, at least one of the protrusions in each group corresponds to and abuts against the connecting protrusion, and the first direction, the second direction, and the third direction intersect each other.

[0015] In some embodiments, there are multiple support plates, each of which is disposed along the third direction, and all the support plates are spaced apart along the second direction. At least one of the protrusions on each support plate abuts against the connecting protrusion.

[0016] In some embodiments, the heat exchange plate includes: a heat-conducting plate, wherein the heat exchange surface is located on the heat-conducting plate and the connecting protrusion is located on the side of the heat-conducting plate opposite to the heat exchange surface; and a flow channel plate, which is fastened to the side of the heat-conducting plate opposite to the heat exchange surface, wherein the flow channel plate is provided with a relief opening corresponding to the connecting protrusion and the connecting protrusion passes through the relief opening.

[0017] In some embodiments, a first groove is formed on the heat exchange surface at a position corresponding to the connecting protrusion.

[0018] In some embodiments, the support plate has reinforcing ribs along a third direction on one side facing the heat exchange plate; in the third direction, a plurality of protrusions are spaced apart on the reinforcing ribs, and adjacent protrusions form a through groove in a second direction, wherein the first direction, the second direction, and the third direction intersect each other; the heat exchange plate has a first refrigerant channel arranged along the second direction inside, and the outer wall of the first refrigerant channel forms a protrusion structure on the second side of the heat exchange plate, the protrusion structure passes through the through groove, and the protrusion structure is clearance-fitted with the inner wall of the through groove.

[0019] In some embodiments, there are multiple first refrigerant channels, which are spaced apart in the third direction. The outer wall of each first refrigerant channel forms a protrusion structure on the second side of the heat exchange plate, and a second groove is formed between two adjacent protrusion structures. Among all the protrusions, some of the protrusions correspond one-to-one with the second groove and abut against the corresponding second groove.

[0020] In some embodiments, there are multiple reinforcing ribs, which are spaced apart along the second direction, and each reinforcing rib is provided with multiple protrusions.

[0021] In some embodiments, in the first direction, the frame has a first side away from the heat exchange plate and a second side facing the heat exchange plate, the outer periphery of the heat exchange plate is connected to the second side of the frame, the support plate is connected to the first side of the frame, and the heat exchange plate and the support plate clamp and fix the frame.

[0022] In some embodiments, in a third direction intersecting the first direction, the support plate has two oppositely disposed ends, and each end of the support plate has a first folded edge formed thereon. The support plate is connected to the first side of the frame through the first folded edge. Among all the protrusions, some of the protrusions are spaced apart along the third direction. The first and last of the protrusions spaced apart along the third direction are respectively located at both ends of the support plate and are adjacent to the corresponding first folded edge. The first and last of the protrusions spaced apart along the third direction are connected to the first side of the frame.

[0023] In some embodiments, the frame includes: a first side beam disposed along a second direction and having a first end and a second end, wherein there are two first side beams, which are spaced apart in a third direction, and the first direction, the second direction, and the third direction intersect each other; a second side beam disposed along the third direction, with both ends of the second side beam connected to the first ends of the two first side beams respectively; a connecting plate disposed along the third direction, with both ends of the connecting plate connected to the second ends of the two first side beams respectively, wherein the first side beam, the second side beam, and the connecting plate form a frame-like structure; and the first folded edge at the same end of the support plate and the protrusion adjacent to the first folded edge are all connected to the same first side beam.

[0024] In some embodiments, the first side beam includes: a first beam body extending along the second direction, the first beam body having a first connecting surface and a second connecting surface disposed opposite to each other in the first direction, the first connecting surface being located on a first side of the frame and the second connecting surface being located on a second side of the frame; a first eaves disposed along the second direction and located on the side of the first beam body facing another first side beam, the first eaves having a third connecting surface and a fourth connecting surface disposed opposite to each other in the first direction, the third connecting surface being located on a first side of the frame and the fourth connecting surface being located on a second side of the frame; a first folded edge connected to the first connecting surface, a protrusion adjacent to the first folded edge connected to the third connecting surface, and a heat exchange plate simultaneously connected to the second connecting surface and the fourth connecting surface.

[0025] In some embodiments, a mounting groove is provided on the first connecting surface, and the first folded edge is located within the mounting groove.

[0026] In some embodiments, the heat exchange plate includes: a heat-conducting plate having a first side and a second side disposed opposite to each other in a first direction, the heat exchange surface being located on the first side of the heat-conducting plate, and the second side of the heat-conducting plate having a fastening surface; a flow channel plate fastening to the fastening surface of the heat-conducting plate, the edges of the flow channel plate being respectively connected to the heat-conducting plate and the fourth connecting surface; and a second folded edge connected to the two edges of the heat-conducting plate in the third direction, the second folded edge being riveted to the second connecting surface.

[0027] In some embodiments, in the second direction, the heat-conducting plate has a first end and a second end, the first end of the heat-conducting plate being used to connect with a connecting plate; at the first end of the heat-conducting plate, a transition structure is formed at the connection position of the second folded edge and the heat-conducting plate, the transition structure having a first abutting surface facing the upper cover and a second abutting surface facing the connecting plate, the first abutting surface being connected to the heat exchange surface and used to fit and abut against the upper cover, the second abutting surface being connected to the fastening surface; the connecting plate is provided with a support boss corresponding to the transition structure, the support boss fitting and abutting against the second abutting surface.

[0028] In some embodiments, the position where the first contact surface is connected to the heat exchange surface forms an included angle A, and the included angle A ranges from 90° to A to 180°.

[0029] In some embodiments, the top cover has a first end and a second end along the second direction, the first end of the top cover corresponds to the first end of the heat-conducting plate, the first end of the top cover has a first pressing edge, an inclined segment matching the transition structure is formed on the first pressing edge, and the inclined segment of the first pressing edge is pressed onto the first abutting surface.

[0030] In some embodiments, the battery pack further includes: a limiting block disposed on the outer periphery of the frame for limiting the displacement of the battery pack in a second direction and / or a third direction, wherein the first direction, the second direction and the third direction intersect each other.

[0031] In some embodiments, the battery pack further includes a sealing ring disposed between the upper cover and the lower housing to achieve a sealing fit between the upper cover and the lower housing.

[0032] In some embodiments, the battery pack further includes an insulating sheet disposed between the steel strip and the copper busbar of the module unit to prevent the steel strip from short-circuiting upon contact with the copper busbar.

[0033] According to a second aspect of this application, an energy storage system is also disclosed, including the aforementioned battery pack.

[0034] The battery pack of this application improves the support strength of the support plate, thereby increasing the upper limit of the support plate's load-bearing capacity and effectively enhancing the support strength of the lower housing. Furthermore, because the yield strength of the material used for the support plate is greater than that of the material used for the heat exchange plate, the load-bearing capacity of the lower housing is effectively improved. This eliminates the need for a middle module beam, allowing the lower housing to support larger module units, thus increasing the energy density of the battery pack. Attached Figure Description

[0035] The accompanying drawings used in the description of the embodiments or prior art are briefly introduced below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 is a schematic diagram of the battery pack structure according to an embodiment of this application;

[0037] Figure 2 is a schematic diagram of the lower casing of the battery pack according to an embodiment of this application;

[0038] Figure 3 is a side view of the lower housing of the battery pack according to an embodiment of this application;

[0039] Figure 4 is a magnified view of part B in Figure 3;

[0040] Figure 5 is a magnified view of part C in Figure 3;

[0041] Figure 6 is a schematic diagram of the assembly of the frame and support frame according to an embodiment of this application;

[0042] Figure 7 is a schematic diagram of the structure of the first side beam in an embodiment of this application.

[0043] Figure 8 is a structural schematic diagram of the support beam according to an embodiment of this application;

[0044] Figure 9 is a schematic diagram of the back structure of the flow channel plate according to an embodiment of this application;

[0045] Figure 10 is a schematic diagram of the structure of the connecting plate according to an embodiment of this application;

[0046] Figure 11 is a magnified view of part A in Figure 3;

[0047] Figure 12 is a side view of the heat exchange plate in the second direction according to an embodiment of this application;

[0048] List of reference numerals in the attached drawings: 10. Lower housing; 11. Heat exchange plate; 111. Heat conduction plate; 1111. Heat exchange surface; 1112. Fastening surface; 1113. Connecting protrusion; 1114. First groove; 112. Flow channel plate; 1121. Clearance opening; 1122. First flow channel groove; 1123. Second flow channel groove; 1124. Protruding structure; 1125. Second groove; 1126. Buffer groove; 113. Second folded edge; 114. Third... 115. Folded edge; 1151. Transition structure; 1152. First abutment surface; 1152. Second abutment surface; 12. Frame; 121. First side beam; 1211. First beam body; 1211a. First connecting surface; 1211b. Second connecting surface; 1212. First eaves; 1212a. Third connecting surface; 1212b. Fourth connecting surface; 122. Second side beam; 1221. Second beam body; 1222. Second eaves 1213. Eaves; 1214. Mounting groove; 1215. Lifting hole; 123. Connecting plate; 1231. Support boss; 1232. Connecting boss; 1233. Pressing boss; 13. Support plate; 131. Plate body; 1311. First folded edge; 132. Reinforcing rib; 133. Protrusion; 1331. First protrusion; 1332. Second protrusion; 1333. Third protrusion; 134. Clearance groove; 14. Connector; 20. Module unit; 30. Top cover; 31. Cover body; 321. First pressing edge; 3211. Inclined section; 3212. Horizontal section; 322. Second pressing edge; 323. Third pressing edge; 32. Pressing edge; 41. Limiting block; 42. Module beam; 43. Module beam; 50. Sealing ring; 60. Electrical mounting panel; 71. Main positive socket; 72. Main negative socket; 80. Copper busbar; 91. Insulating sheet; 92. Steel strip. Detailed Implementation

[0049] To enable those skilled in the art to better understand the technical solution of this application, the battery pack and energy storage system provided in this application will be described in detail below with reference to the accompanying drawings.

[0050] With the development of new energy storage systems, the development direction of batteries is towards larger capacity and larger size. For lithium iron phosphate batteries commonly used in energy storage, the ever-increasing battery capacity has led to a further increase in the size and weight of the batteries themselves.

[0051] In some related technologies, the battery pack typically uses a rectangular lower box that can support two 13-cell battery modules along its length. The lower box has a central module beam in the middle to connect the two battery modules. However, when dealing with heavy batteries or modules with more than 13 cells in each cell (such as 16 or more), the load-bearing capacity of the lower box may be insufficient, thus limiting the energy density of the battery pack.

[0052] Existing lower enclosures typically include: a cold plate, a frame, and reinforcing plates. The cold plate is used to cool the battery modules, while the frame is connected around the cold plate and serves as the main load-bearing structure. The reinforcing plates are connected to the frame to strengthen the frame structure and improve its load-bearing capacity.

[0053] Typically, cold-rolled steel plates require aluminum profiles with good thermal conductivity. To ensure reliable welding with the cold-rolled steel plates, the frame and reinforcing ribs are usually made of the same material, namely aluminum profiles. However, aluminum profiles have a lower load-bearing capacity than steel profiles, which results in a lower overall load-bearing capacity of the lower housing.

[0054] Although steel profiles are structurally stronger than aluminum profiles, they have poor thermal conductivity. Therefore, using steel profiles as the material for cold plates will reduce thermal conductivity and affect the cooling effect of the cold plates on the battery modules. Thus, how to balance the thermal conductivity and load-bearing capacity of the lower housing is an urgent problem to be solved in this application.

[0055] To address the aforementioned problems, as shown in Figures 1 to 12, this application discloses a battery pack for use in an energy storage system. The battery pack includes a lower housing 10, a module unit 20, and an upper cover 30. The upper cover 30 is fastened to the lower housing 10 and forms a receiving cavity. The module unit 20 is connected to the lower housing 10 and located within the receiving cavity.

[0056] It should be noted that, as shown in Figures 1 to 12, the thickness direction of the battery pack is the first direction, which is the x-axis direction; the length direction of the battery pack is the second direction, which is the y-axis direction; and the width direction of the battery pack is the third direction, which is the z-axis direction. The first, second, and third directions are all perpendicular to each other.

[0057] As can be understood, as shown in Figure 1, the lower housing 10, the module unit 20, and the upper cover 30 are arranged sequentially along the first direction, the thickness direction of the lower housing 10 is arranged along the first direction, the length direction of the lower housing 10 is arranged along the second direction, and the width direction of the lower housing 10 is arranged along the third direction.

[0058] As shown in Figure 2, the lower housing 10 includes a heat exchange plate 11, a frame 12, and a support plate 13. The heat exchange plate 11 has a first side and a second side arranged opposite to each other in a first direction. The first side of the heat exchange plate 11 has a heat exchange surface 1111 for supporting the module unit 20 and exchanging heat with the module unit 20. Referring to Figures 3 and 4, the frame 12 is connected to the second side of the heat exchange plate 11. The support plate 13 abuts against the second side of the heat exchange plate 11 and is connected to the frame 12; the support plate 13 is fixedly connected to the heat exchange plate 11. The yield strength of the material used for the support plate 13 is greater than the yield strength of the material used for the heat exchange plate 11.

[0059] The battery pack of this application is fixedly connected to the heat exchange plate 11 via the support plate 13 of the lower housing 10, thereby achieving mutual connection and relative fixation between the heat exchange plate 11, the frame 12, and the support plate 13, making the entire lower housing 10 a whole. Since the yield strength of the material used for the support plate 13 is greater than that of the material used for the heat exchange plate 11, it is equivalent to increasing the support strength of the support plate 13, thereby increasing the upper limit of the load-bearing capacity of the support plate 13, which in turn increases the support strength of the entire lower housing 10. This effectively improves the load-bearing capacity of the lower housing 10, thus eliminating the need for the middle module beam. The space saved can support larger module units 20, thereby increasing the energy density of the battery pack.

[0060] It should be noted that the support plate 13 and the heat exchange plate 11 can be fixedly connected by means of bonding, welding, riveting, etc. Without departing from the inventive principles and concept of this application, the above situations are all within the protection scope of this application.

[0061] It should also be noted that in this embodiment, the module unit 20 includes at least one battery module. As the module unit becomes larger, the number of battery modules in the module unit also increases, and thus the energy density is correspondingly higher.

[0062] In some embodiments, the support plate 13 and the heat exchange plate 11 are made of different materials. For example, the heat exchange plate 11 may be made of aluminum alloy, and the support plate 13 may be made of alloy steel, and the heat exchange plate 11 and the support plate 13 may be riveted together. In addition, the heat exchange plate 11 may also be made of copper alloy or other materials, and the support plate 13 may also be made of titanium alloy or other materials.

[0063] It should be noted that although the support plate 13 and the heat exchange plate 11 are made of different materials in some embodiments, this is not limiting. In some other embodiments not shown in the figures, the support plate 13 and the heat exchange plate 11 may be made of the same material, or the support plate 13 and the heat exchange plate 11 may be made of the same type of alloy, but with different alloy ratios. Without departing from the inventive principles and concept of this application, all of the above situations are within the protection scope of this application.

[0064] In the embodiment shown in Figure 5, the thermal conductivity of the material used for the heat exchange plate 11 is greater than that of the material used for the support plate 13.

[0065] Compared with the prior art, since the support plate 13 and the heat exchange plate 11 are made of different materials, the heat exchange plate 11 can be made of a material with higher thermal conductivity, while the support plate 13 can be made of a material with higher yield strength. This improves the load-bearing capacity of the lower housing 10 while ensuring the heat dissipation effect of the module unit 20.

[0066] As shown in Figure 5, a connector 14 is provided on the support plate 13, and the connector 14 is connected to the heat exchange plate 11.

[0067] For example, the connector 14 can be a bolt, rivet, etc., to realize the screw connection or riveting between the support plate 13 and the heat exchange plate 11.

[0068] The battery pack of this application uses connectors 14 to pass through the support plate 13 of the lower housing 10, so that the support plate 13 of different materials and the heat exchange plate 11 are fixedly connected by the connectors 14. This achieves mutual connection between the heat exchange plate 11, the frame 12 and the support plate 13, and thus relatively fixes them, so that the entire lower housing 10 forms a whole, thereby improving the overall strength and the load-bearing capacity of the lower housing 10. It can eliminate the need for the middle module beam and support a larger module unit 20, thereby improving the energy density of the battery pack.

[0069] It should be noted that because the support plate 13 and the heat exchange plate 11 are made of different materials, they cannot be directly fixedly connected by welding. If they cannot be fixedly connected, the heat exchange plate 11 and the support plate 13 can only be indirectly fixedly connected through the frame 12. The support plate 13 and the heat exchange plate 11 are prone to relative movement, making it impossible for the entire lower housing 10 to form a whole, which would reduce the load-bearing capacity of the lower housing 10. However, by installing a connector 14 through the support plate 13, the support plate 13 and the heat exchange plate 11 can be fixedly connected through the connector 14, which is not affected by the different materials. This allows for a reliable connection between the support plate 13 and the heat exchange plate 11, making the entire lower housing 10 a whole and improving the load-bearing capacity of the lower housing 10.

[0070] For example, the heat exchange plate 11 is made of aluminum alloy, and the support plate 13 is made of alloy steel (e.g., high-strength steel). The heat exchange plate 11 and the support plate 13 are riveted together by connectors 14, for example, using SPR riveting technology. By using aluminum alloy as the material for the heat exchange plate 11, the thermal conductivity of aluminum alloy is typically between 130-220 W / (m·K), while that of alloy steel is typically between 10-50 W / (m·K). Therefore, compared to alloy steel, aluminum alloy has excellent thermal conductivity, thus ensuring the heat exchange efficiency of the heat exchange plate 11 and the module unit 20. At the same time, the yield strength of aluminum alloy is generally between 280 MPa and 320 MPa, while the yield strength of some alloy steels can reach 600 MPa or higher. Therefore, using alloy steel for the support plate 13 can effectively increase the load-bearing capacity of the lower housing 10. By riveting, the heat exchange plate 11 and the support plate 13 can be fixedly connected, ensuring heat exchange while making the entire lower box 10 a whole, thus improving the load-bearing capacity of the lower box 10.

[0071] In a further embodiment, the frame 12 is made of the same material as the support plate 13, the heat exchange plate 11 is riveted to the frame 12, and the frame 12 is welded to the support plate 13. By making the frame 12 the same material as the support plate 13, the strength of the frame 12 is improved. Furthermore, since the frame 12 and the support plate 13 are made of the same material, a reliable connection can be achieved through welding. Although the heat exchange plate 11 and the frame 12 are made of different materials, a reliable connection can still be achieved by riveting them together.

[0072] As shown in Figure 6, in this embodiment, there are multiple support plates 13. Each support plate 13 is arranged along a third direction in its length direction and along a second direction in its width direction. In the third direction, both ends of the support plate 13 are connected to the frame 12. The multiple support plates 13 are spaced apart in the second direction. Each support plate 13 abuts against the heat exchange plate 11 and is riveted to and fixed to the heat exchange plate 11. This provides multi-point support for the heat exchange plate 11, ensuring uniform support and improving overall strength. Furthermore, the riveting of each support plate 13 to the heat exchange plate 11 enables multi-point connection, dispersing stress generated during connection and preventing stress concentration.

[0073] As shown in Figure 8, the support plate 13 includes: a plate body 131, reinforcing ribs 132 disposed on the plate body 131, and protrusions 133 disposed on the reinforcing ribs 132. The length direction of the plate body 131 is along a third direction, and the width direction of the plate body 131 is along a second direction. The protrusions of the reinforcing ribs 132 face the heat exchange plate 11. There are multiple reinforcing ribs 132, each disposed along a third direction, and the multiple reinforcing ribs 132 are spaced apart along the second direction. There are also multiple protrusions 133, with multiple protrusions 133 disposed on each reinforcing rib 132, and the protrusions 133 on each reinforcing rib 132 are spaced apart along a third direction.

[0074] It should be noted that in this embodiment, there are five reinforcing ribs 132, but this is not limiting. In some other embodiments not shown in the figure, the number of reinforcing ribs 132 can be one, two, three, four, or six, etc. In other embodiments not shown in the figure, it is also feasible to omit the reinforcing ribs 132 and directly place the protrusions 133 on the plate 131. However, in this embodiment, by providing reinforcing ribs 132, the strength of the support plate 13 can be improved, thereby effectively enhancing the load-bearing capacity of the lower housing 10.

[0075] Referring to Figures 3 to 5, in this embodiment, the protrusion direction of the protrusion 133 is the first direction and faces the heat exchange plate 11. The protrusion 133 abuts against the second side of the heat exchange plate 11. The connector 14 passes through at least a portion of the protrusion 133, so that at least a portion of the protrusion 133 is fixedly connected to the heat exchange plate 11. In other words, among the multiple protrusions 133, at least a portion of the protrusions 133 are provided with connectors 14, thereby fixing these protrusions 133 with connectors 14 to the heat exchange plate 11. By having multiple protrusions 133 abut against the heat exchange plate 11, support for the heat exchange plate 11 in the first direction can be achieved. At the same time, by fixing a portion of the protrusions 133 to the heat exchange plate 11, the connection strength is improved, relative shaking is avoided, and thus the structural strength is improved.

[0076] In this embodiment, as shown in FIG5, the second side of the heat exchange plate 11 has a plurality of connecting protrusions 1113. Among all the protrusions 133, some protrusions 133 through which connectors 14 pass, correspond one-to-one with the connecting protrusions 1113 and abut against each other. The abutting protrusions 133 and the connecting protrusions 1113 are fixedly connected by the connectors 14. By forming connecting protrusions 1113 on the second side of the heat exchange plate 11, on the one hand, effective contact can be formed by the one-to-one correspondence and abutment with some of the protrusions 133, and a reliable connection can be achieved with the connectors 14. On the other hand, due to the presence of the connecting protrusions 1113, a certain distance is formed between the connection position of the abutting protrusions 133 and the heat exchange surface 1111. This can prevent deformation of the connection position during riveting, which would cause the heat exchange surface 1111 to form a protrusion, thereby avoiding poor contact between the module unit 20 and the heat exchange surface 1111 and ensuring the heat dissipation effect of the module unit 20.

[0077] For example, the plurality of protrusions 133 include a first protrusion 1331. Referring to Figures 5 and 7, it can be seen that among all the protrusions 133, the first protrusion 1331 is used for fixed connection with the heat exchange plate 11. As shown in Figure 5, the second side of the heat exchange plate 11 has a connecting protrusion 1113 corresponding to the first protrusion 1331. The first protrusion 1331 abuts against the connecting protrusion 1113, and a connector 14 passes through the first protrusion 1331 and fixes the first protrusion 1331 and the connecting protrusion 1113 together. By forming the connecting protrusion 1113 on the second side of the heat exchange plate 11, it can effectively contact the first protrusion 1331, and then achieve a reliable connection with the connector 14. On the other hand, the presence of the connecting protrusion 1113 creates a certain distance between the connection position of the first protrusion 1331 and the connecting protrusion 1113 and the heat exchange surface 1111. This prevents deformation of the connection position during riveting, which could cause the heat exchange surface 1111 to protrude, thus avoiding poor contact between the module unit 20 and the heat exchange surface 1111 and ensuring the heat dissipation effect of the module unit 20. It is understood that there are multiple first protrusions 1331 and connecting protrusions 1113, with each first protrusion 1331 corresponding to one connecting protrusion 1113. This improves the reliability of the connection.

[0078] Referring to Figures 2, 5, and 7, it can be seen that in this embodiment, there are multiple groups of protrusions 133, which are spaced apart in the second direction. Within the same group, the protrusions 133 are also spaced apart in the third direction. At least one protrusion 133 in each group corresponds to and abuts against the connecting protrusion 1113. In other words, at least one first protrusion 1331 in each group corresponds to and abuts against the connecting protrusion 1113.

[0079] For example, as shown in Figure 8, the first protrusions 1331 are in multiple groups, and these groups are spaced apart in the second direction. The first protrusions 1331 in the same group are also spaced apart in the third direction. In other words, the first protrusions 1331 in the same group are located on the same reinforcing rib 132, while the first protrusions 1331 in different groups are located on different reinforcing ribs 132, thus forming a matrix distribution. By forming a matrix distribution, the individual support plate 13 and heat exchange plate 11 are connected and fixed through the matrix-distributed first protrusions 1331 and connecting protrusions 1113. Therefore, the stress points are more dispersed, the stress is more uniform, and stress concentration is reduced.

[0080] It should be noted that the first protrusions 1331 on each reinforcing rib 132 can be the same or different, and the number of first protrusions 1331 on the reinforcing rib 132 is not limited; it can be zero, one, two, three, etc. Taking this embodiment as an example, the two outermost reinforcing ribs 132 are each provided with three first protrusions 1331, the middle reinforcing rib 132 is provided with two first protrusions 1331, and the remaining two reinforcing ribs 132 are not provided with first protrusions 1331. Furthermore, the first protrusions 1331 on different reinforcing ribs 132 are aligned in the second direction. For example, in Figure 8, the first protrusions 1331 on the two outermost reinforcing ribs 132 are aligned with each other in the second direction, and the two first protrusions 1331 on the middle reinforcing rib 132 are also aligned with the first protrusions 1331 on the two outermost reinforcing ribs 132 in the second direction.

[0081] Understandably, each support plate 13 is arranged along a third direction, and all support plates 13 are spaced apart along a second direction. Each support plate 13 has at least one protrusion 133 that abuts against a connecting protrusion 1113. That is, when there are multiple support plates 13, each support plate 13 has at least one first protrusion 1331 that abuts against a connecting protrusion 1113, thereby ensuring a reliable connection between the support plate 13 and the heat exchange plate 11. Furthermore, the first protrusions 1331 on all support plates 13 are arranged in a one-to-one correspondence with all connecting protrusions 1113. This allows the weight of the heat exchange plate 11 to be evenly distributed across each support plate 13, and further dispersed through the first protrusions 1331 and connecting protrusions 1113, thereby reducing stress concentration and improving the load-bearing capacity of the lower housing 10.

[0082] As shown in Figures 2 and 5, the heat exchange plate 11 includes a heat-conducting plate 111 and a flow channel plate 112. The heat-conducting plate 111 has a first side and a second side arranged opposite to each other in a first direction. The heat exchange surface 1111 is located on the first side of the heat-conducting plate 111, and the second side of the heat-conducting plate 111 has a fastening surface 1112. The connecting protrusion 1113 is located on the side of the heat-conducting plate 111 away from the heat exchange surface 1111, that is, on the fastening surface 1112. The flow channel plate 112 is fastened to the side of the heat-conducting plate 111 away from the heat exchange surface 1111, that is, the flow channel plate 112 is fastened and connected to the fastening surface 1112. The flow channel plate 112 is provided with a relief opening 1121 corresponding to the connecting protrusion 1113, and the connecting protrusion 1113 passes through the relief opening 1121.

[0083] As can be seen from Figures 2 and 5, the connecting protrusion 1113 is located on the mating surface 1112 of the heat exchange plate 11, and the flow channel plate 112 is provided with a relief opening 1121 corresponding to the connecting protrusion 1113. After the flow channel plate 112 and the heat exchange plate 11 are fastened together, the connecting protrusion 1113 passes through the relief opening 1121, thereby abutting against the first protrusion 1331. With this arrangement, it is equivalent to the heat conducting plate 111 and the support plate 13 being riveted together, forming a clamping force between them, which allows the flow channel plate 112 to fit more tightly with the heat conducting plate 111, improving the reliability of the connection between the heat conducting plate 111 and the flow channel plate 112.

[0084] As shown in Figures 2 and 5, a first groove 1114 is formed on the heat exchange surface 1111 at a position corresponding to the connecting protrusion 1113. That is, after the heat-conducting plate 111 is recessed from the heat exchange surface 1111 towards the fastening surface 1112, a connecting protrusion 1113 is formed on the side away from the heat exchange surface 1111. Therefore, a first groove 1114 is formed at the corresponding position on the heat exchange surface 1111. By adopting this method, on the one hand, after the first protrusion 1331 is riveted to the connecting protrusion 1113, the presence of the first groove 1114 can be used to accommodate the connector 14, preventing the connector 14 from protruding from the heat exchange surface 1111; on the other hand, even if the riveting position is slightly deformed, it will be located within the first groove 1114 and will not cause deformation of the heat exchange surface 1111. Therefore, the flatness of the heat exchange surface 1111 can be guaranteed, avoiding affecting the installation of the module unit 20, thereby ensuring sufficient contact between the heat exchange surface 1111 and the module unit 20 and ensuring heat exchange efficiency.

[0085] As shown in Figure 2, a first flow channel 1122 and a second flow channel 1123 are respectively provided on the front side of the flow channel plate 112, that is, on the side of the flow channel plate 112 facing the heat transfer plate 111. The first flow channel 1122 is arranged along the second direction, and there are multiple first flow channel 1122s, which are spaced apart along the third direction. The second flow channel 1123 is arranged along the third direction, and adjacent first flow channel 1122s are connected through the second flow channel 1123. When the flow channel plate 112 and the heat transfer plate 111 are fastened and welded together, the first flow channel 1122 and the fastening surface 1112 of the heat transfer plate 11 form a first refrigerant flow channel arranged along the second direction, and the second flow channel 1123 and the fastening surface 1112 of the heat transfer plate 11 form a second refrigerant flow channel arranged along the third direction.

[0086] It is understandable that the outer wall of the first refrigerant channel forms a protruding structure 1124 on the second side of the heat exchange plate 11. This is because the first channel groove 1122 is formed by recessing from the front to the back of the channel plate 112. Therefore, as shown in Figure 9, a protruding structure 1124 will be formed on the back of the channel plate 112, that is, on the side of the channel plate 112 away from the heat exchange plate 11, corresponding to the position of the first channel groove 1122. The back of the channel plate 112 is the second side of the heat exchange plate 11. The protruding structure 1124 is also arranged along the second direction and corresponds one-to-one with the first channel groove 1122, that is, the first refrigerant channel.

[0087] As shown in Figures 3, 4 and 8, in the same group of protrusions 133, adjacent protrusions 133 form a through groove 134 in the second direction, and a protrusion structure 1124 arranged in the second direction passes through the through groove 134, and the protrusion structure 1124 and the inner wall of the through groove 134 are fitted with a clearance. By forming a clearance groove 134 between adjacent protrusions 133, the protrusion structure 1124 formed on the back of the flow channel plate 112, that is, the second side of the heat exchange plate 11, is positioned in the clearance groove 134 and is clearance-fitted with the clearance groove 134, so that the protrusion structure 1124 does not contact the inner wall of the clearance groove 134. This avoids wear and cracking of the flow channel wall caused by vibration friction or collision. At the same time, as shown in Figure 5, due to the riveting of the first protrusion 1331 and the connecting protrusion 1113, the positions of the protrusion structure 1124 and the clearance groove 134 are relatively fixed, which can further prevent relative movement between the two, thereby effectively avoiding collision or friction between them. Moreover, the support plate 13 can also play a certain protective role for the first refrigerant flow channel, improving the reliability of the heat exchange plate 11.

[0088] Referring to Figures 4 and 9, there are multiple first refrigerant channels, which are spaced apart in a third direction. That is, the outer wall of each first refrigerant channel forms a protrusion 1124 on the second side of the heat exchange plate 11, and a second groove 1125 is formed between two adjacent protrusions 1124. A portion of the protrusions 133 correspond one-to-one with the second grooves 1125 and abut against them. By abutting a portion of the protrusions 133 against the second grooves 1125, the support area of ​​the support plate 13 on the heat exchange plate 11 is increased, allowing the weight of the heat exchange plate 11 to be more evenly distributed on the support plate 13. Furthermore, since the abutting position of a portion of the protrusions 133 is located between adjacent first refrigerant channels, avoiding the channels themselves, there is no wear on the channels, thus avoiding the risk of leakage due to damage.

[0089] For example, as shown in Figures 4 and 8, the plurality of protrusions 133 further include: a second protrusion 1332, wherein there are multiple second protrusions 1332, the second protrusions 1332 on the same reinforcing rib 132 are spaced apart along a third direction, while the second protrusions 1332 on different reinforcing ribs 132 are aligned in a second direction, and there is a clearance groove 134 between two adjacent second protrusions 1332.

[0090] It should be noted that a clearance groove 134 is formed between two adjacent protrusions 133. The two protrusions 133 can be the same or different. For example, if two adjacent protrusions 133 are both second protrusions 1332, then a clearance groove 134 is formed between two adjacent second protrusions 1332. Another example is if two adjacent protrusions 133 are respectively a first protrusion 1331 and a second protrusion 1332, then a clearance groove 134 is formed between adjacent first protrusions 1331 and second protrusions 1332. Yet another example is if two adjacent protrusions 133 are respectively a second protrusion 1332 and a third protrusion 1333 (described below), then a clearance groove 134 is formed between adjacent second protrusions 1332 and third protrusions 1333. Therefore, any situation where a clearance groove 134 is formed between two adjacent protrusions 133 is within the scope of protection of this application, provided it does not violate the principles and inventive concept of this application.

[0091] As shown in Figure 4, each second protrusion 1332 corresponds to a second groove 1125, and each second protrusion 1332 abuts against the corresponding second groove 1125. By having the second protrusion 1332 abut against the second groove 1125, the support area of ​​the support plate 13 on the heat exchange plate 11 is increased, allowing the weight of the heat exchange plate 11 to be more evenly distributed onto the support plate 13. Furthermore, since the abutting position of the second protrusion 1332 is located between adjacent first refrigerant channels, avoiding the first refrigerant channels, it will not cause wear to the channels, thus avoiding the risk of leakage due to damage.

[0092] As can be understood, as shown in Figure 8, in the second direction, the protrusions 133 on the different reinforcing ribs 132 are aligned with each other. Since all the protrusions 133 correspond to each other, the clearance grooves 134 are also aligned, and the protrusion structure 1124 corresponding to each first refrigerant flow channel can avoid wear by passing through multiple corresponding clearance grooves 134.

[0093] It should be noted that, in this embodiment, as shown in FIG9, both the first refrigerant flow channel and the protruding structure 1124 extend in a straight line along the second direction. Therefore, in this embodiment, the protrusions 133 on different reinforcing ribs 132 are aligned with each other, as shown in FIG8. That is, a straight distribution is formed between the corresponding protrusions 133 in the second direction, so that the corresponding clearance grooves 134 in the second direction are also straight, thereby allowing them to communicate with each other in the second direction to accommodate the straight-extending protruding structure 1124. However, this is not limiting. If the protruding structure 1124 is distributed in a curved or broken line manner, then the distribution of the protrusions 133 in the second direction is also adapted to the protruding structure 1124 so that the clearance grooves 134 can accommodate the protruding structure 1124.

[0094] As shown in Figure 2, a buffer groove 1126 is also provided on the flow channel plate 112. After the flow channel plate 112 and the heat conduction plate 111 are fastened and welded, the buffer groove 1126 and the fastening surface 1112 form a closed cavity to buffer the deformation caused by the welding heat of the flow channel plate 112. At the same time, it is used to accommodate the air discharged from the flow channel plate 112 and the heat conduction plate 111 during welding, so as to prevent the air from forming bubbles between the connection interface of the heat conduction plate 111 and the flow channel plate 112, which would cause the heat exchange plate 11 to deform.

[0095] As shown in Figures 2 and 4, in the first direction, the frame 12 has a first side facing away from the heat exchange plate 11 and a second side facing the heat exchange plate 11. The outer periphery of the heat exchange plate 11 is connected to the second side of the frame 12, and the support plate 13 is connected to the first side of the frame 12. The heat exchange plate 11 and the support plate 13 clamp and fix the frame 12. By connecting the support plate 13 and the heat exchange plate 11 to both sides of the frame 12 respectively, after the support plate 13 and the heat exchange plate 11 are riveted, additional clamping force can be provided to clamp and fix the frame 12, improving the connection strength. Thus, the heat exchange plate 11, the frame 12, and the support plate 13 form a whole, improving the load-bearing capacity of the lower housing 10.

[0096] As shown in Figure 8, the plate body 131 of the support plate 13 has two opposite ends in the third direction. The two ends of the plate body 131 of the support plate 13 are respectively formed with first folded edges 1311. As shown in Figure 4, the two ends of the plate body 131 are first bent towards the side of the plate body 131 away from the heat exchange plate 11, and then bent towards the outside in the third direction to form the first folded edges 1311. The support plate 13 is connected to the first side of the frame 12 through the first folded edges 1311.

[0097] Of all the protrusions 133, a portion of the protrusions 133 are spaced apart along a third direction. The first and last of the protrusions 133 spaced apart along the third direction are located at both ends of the support plate 13 and are adjacent to the corresponding first folded edge 1311. The first and last of the protrusions 133 spaced apart along the third direction are connected to the first side of the frame 12.

[0098] For example, as shown in FIG8, the plurality of protrusions 133 further include a third protrusion 1333. The first and last of the protrusions 133 spaced apart along a third direction are respectively the third protrusions 1333. That is, there is at least one pair of third protrusions 1333, and the same pair of third protrusions 1333 are respectively disposed at both ends of the support plate 13 and close to the first folded edge 1311, and the third protrusions 1333 are connected to the first side of the frame 12.

[0099] As shown in Figure 8, each reinforcing rib 132 is provided with two third protrusions 1333, which are located at both ends of the same reinforcing rib 132. As shown in Figure 4, the first folded edge 1311 and the third protrusions 1333 are respectively connected to the first side of the frame 12. By connecting the first folded edge 1311 and the third protrusions 1333 to the first side of the frame 12, the connection area between the support plate 13 and the frame 12 is increased, thereby improving the reliability of the connection.

[0100] As shown in Figure 6, the frame 12 includes a first side beam 121, a second side beam 122, and a connecting plate 123. The first side beam 121 is arranged along a second direction and has a first end and a second end. There are two first side beams 121, spaced apart in a third direction. The second side beam 122 is arranged along a third direction, and its two ends are respectively connected to the first ends of the two first side beams 121. The connecting plate 123 is arranged along a third direction, and its two ends are respectively connected to the second ends of the two first side beams 121. The first side beams 121, the second side beams 122, and the connecting plate 123 form a frame structure. The first flange 1311 and the adjacent protrusion 133 on the same end of the support plate 13 are both connected to the same first side beam 121. In other words, as shown in Figure 4, the first flange 1311 and the third protrusion 1333 on the same end are respectively connected to the same first side beam 121.

[0101] As shown in Figure 6, the first side beam 121 includes a first beam body 1211 and a first eaves 1212. The first beam body 1211 extends along a second direction. Referring to Figures 4 and 7, the first beam body 1211 has a first connecting surface 1211a and a second connecting surface 1211b arranged opposite each other in the first direction. The first connecting surface 1211a is located on the first side of the frame 12, and the second connecting surface 1211b is located on the second side of the frame 12. As shown in Figure 6, the first eaves 1212 is arranged along the second direction and located on the side of the first beam body 1211 facing the other first side beam 121, that is, the inner side of the first beam body 1211. As shown in Figure 7, the first... A protruding eave 1212 has a third connecting surface 1212a and a fourth connecting surface 1212b arranged opposite to each other in a first direction. The third connecting surface 1212a is located on the first side of the frame 12, and the fourth connecting surface 1212b is located on the second side of the frame 12. Referring to Figures 4 and 7, the first folded edge 1311 is connected to the first connecting surface 1211a, and the protrusion 133 adjacent to the first folded edge 1311 is connected to the third connecting surface 1212a. The heat exchange plate 11 is simultaneously connected to both the second connecting surface 1211b and the fourth connecting surface 1212b. In other words, as shown in Figure 4, the third protrusion 1333 is connected to the third connecting surface 1212a, and the heat exchange plate 11 is simultaneously connected to both the second connecting surface 1211b and the fourth connecting surface 1212b. By adding a first eave 1212 to the inner side of the first beam 1211, the connection area of ​​the first side beam 121 is increased. This allows the support plate 13 to be welded not only to the first connecting surface 1211a of the first side beam 121 via the first folded edge 1311, but also to the third connecting surface 1212a of the first eave 1212 via the third protrusion 1333, thereby improving the connection strength. Furthermore, since the heat exchange plate 11 is also connected to the other side of the first eave 1212, it can also be supported. Simultaneously, the third protrusion 1333 of the support plate 13 and the heat exchange plate 11 can clamp and fix the first eave 1212, thereby improving the overall connection strength and thus enhancing the load-bearing capacity of the lower housing 10.

[0102] As shown in Figure 7, a mounting groove 1213 is provided on the first connecting surface 1211a, and as shown in Figure 4, the first folded edge 1311 is located within the mounting groove 1213. By providing the mounting groove 1213 on the first connecting surface 1211a, the support plate 13 can be positioned by the cooperation between the first folded edge 1311 and the mounting groove 1213 when it is installed. Meanwhile, after the first folded edge 1311 is welded to the mounting groove 1213, the mounting groove 1213 limits the first folded edge 1311, improving the reliability of the connection. At the same time, since the first folded edge 1311 is located inside the mounting groove 1213, the first folded edge 1311 will not protrude from the first connecting surface 1211a. By adjusting the thickness of the first folded edge 1311 to match the thickness of the mounting groove 1213, the surface of the first folded edge 1311 and the first connecting surface 1211a can be located in the same plane. This allows the first folded edge 1311 and the first connecting surface 1211a to be supported together on the support surface of the battery bracket after the battery pack is placed on the battery bracket, making the force more even and avoiding stress concentration.

[0103] It should be noted that in this embodiment, the cross-section of the first beam 1211 is rectangular and is formed by roll forming of high-strength steel, thus having high strength. As shown in Figure 6, a lifting hole 1214 for lifting is provided on the side of the first beam 1211 away from the other first side beam 121, that is, on the outer side of the first beam 1211, to facilitate lifting.

[0104] As shown in Figure 4, the heat exchange plate 11 further includes a second folded edge 113, which is connected to the two sides of the heat conduction plate 111 in the third direction. As shown in Figure 4, the second folded edge 113 is first bent away from the support plate 13 in the first direction, and then bent to the outside of the heat conduction plate 111 in the third direction. The second folded edge 113 is riveted to the second connecting surface 1211b. The flow channel plate 112 is fastened to the fastening surface 1112 of the heat conduction plate 111. The two sides of the flow channel plate 112 in the third direction are respectively connected to the heat conduction plate 111 and the fourth connecting surface 1212b. By setting the second folded edge 113 on both sides of the heat conduction plate 111 and riveting the second folded edge 113 to the second connecting surface 1211b, the fixed connection between the heat exchange plate 11 and the first side beam 121 is achieved. Meanwhile, the edges of the flow channel plate 112 are connected to the heat conduction plate 111 and the fourth connecting surface 1212b respectively, which is equivalent to supporting the heat exchange plate 11 through the first eaves 1212, and in conjunction with the third protrusion 1333, the load-bearing capacity of the heat exchange plate 11 is improved.

[0105] For example, since the first side beam 121 and the heat exchange plate 11 are made of different materials, the first eaves 1212 and the heat exchange plate 11 are fixedly connected by adhesive bonding to improve the overall strength of the lower housing 10.

[0106] As can be understood, as shown in Figure 6, the second side beam 122 includes a second beam body 1221 and a second eaves 1222, both of which are arranged along a third direction. The second eaves 1222 are located on the side of the second beam body 1221 facing the connecting plate 123. Correspondingly, as shown in Figure 2, the heat exchange plate 11 is also provided with a third folded edge 114. The third folded edge 114 is first bent away from the support plate 13 in a first direction, and then bent towards the outside of the heat exchange plate 111 in a second direction. The third folded edge 114 corresponds to the second side beam 122 and is riveted to the second beam body 1221, while the flow channel plate 112 is connected to the second eaves 1222 on the side edge corresponding to the second side beam 122. The second eaves 1222 are provided on the second beam body 1221, which can form support along a third direction, thereby further improving the load-bearing capacity of the heat exchange plate 11.

[0107] As shown in Figures 2 and 10, in the second direction, the heat-conducting plate 111 has a first end and a second end. The first end of the heat-conducting plate 111 is used to connect with the connecting plate 123, and the second end of the heat-conducting plate 111 is used to connect with the second side beam 122. The third folded edge 114 is located at the second end of the heat-conducting plate 111.

[0108] The second fold 113 extends from the first end of the heat-conducting plate 111 to the second end. At the first end of the heat-conducting plate 111, a transition structure 115 is formed at the connection position between the second fold 113 and the heat-conducting plate 111. At the second end of the heat-conducting plate 111, the second fold 113 is connected to the third fold 114.

[0109] As shown in Figures 11 and 12, the transition structure 115 has a first abutting surface 1151 facing the upper cover 30 and a second abutting surface 1152 facing the connecting plate 123. The first abutting surface 1151 is connected to the heat exchange surface 1111 and is used to abut against the upper cover 30. The second abutting surface 1152 is connected to the fastening surface 1112. The connecting plate 123 is provided with a support boss 1231 corresponding to the transition structure 115. The support boss 1231 abuts against the second abutting surface 1152 of the transition structure 115. By providing the transition structure 115 and abutting against the upper cover 30 and the support boss 1231 respectively through the first abutting surface 1151 and the second abutting surface 1152 of the transition structure 115, longitudinal gaps can be prevented, thereby improving the reliability of the connection.

[0110] As shown in Figure 11, exemplarily, the transition structure 115 is a transition plate, and the two sides of the transition plate in the first direction are the first abutment surface 1151 and the second abutment surface 1152. As shown in Figure 12, the position where the first abutment surface 1151 connects with the heat exchange surface 1111 forms an included angle A, and the value of the included angle A is in the range of 90° < A < 180°. Exemplarily, the included angle A can be 91°, 95°, 100°, 120°, 135°, 150°, 170°, 179°, etc. Since the direction of the clamping force is along the first direction when the upper cover 30 is fastened, by setting the inclined transition structure 115, a downward pressure component force in the first direction can be formed on the first abutment surface 1151, thereby improving the reliability of the connection and the overall sealing performance.

[0111] In this embodiment, the connecting plate 123 is provided with support bosses 1231 at both ends in the third direction, and the surface of the support bosses 1231 is an inclined surface that matches the second abutment surface 1152. When the heat exchange plate 11 is assembled on the frame 12, the inclined surface of the support bosses 1231 on the connecting plate 123 fits and abuts against the second abutment surface 1152. When the heat exchange plate 11 and the connecting plate 123 are riveted, the support bosses 1231 can play the role of supporting the transition structure 115, thereby reducing the deformation of the transition structure 115, improving the connection reliability, and preventing the generation of longitudinal gaps.

[0112] As shown in Figure 1, the upper cover 30 has a first end and a second end along the second direction. The first end of the upper cover 30 corresponds to the first end of the heat-conducting plate 111 of the heat exchange plate 11. The first end of the upper cover 30 has a first pressing edge 321. An inclined section 3211 matching the transition plate is formed on the first pressing edge 321. The inclined section 3211 of the first pressing edge 321 is pressed onto the first abutting surface 1151 of the transition plate.

[0113] Specifically, as shown in Figure 1, the upper cover 30 includes a cover body 31 and a pressing edge 32 disposed on the outer periphery of the cover body 31. The cover body 31 has a first end and a second end in a second direction. The first end of the cover body 31 corresponds to the connecting plate 123, and the second end of the cover body 31 corresponds to the second side beam 122. The pressing edge 32 includes a first pressing edge 321, a second pressing edge 322, and a third pressing edge 323. The first pressing edge 321 is disposed along a third direction and located at the first end of the cover body 31 (forming the first end of the upper cover 30), and is used to be fixedly connected to the heat-conducting plate 111, the flow channel plate 112, and the connecting plate 123 of the heat exchange plate 11. The second pressing edge 322 is disposed along a third direction and located at the second end of the cover body 31 (forming the second end of the upper cover 30), and is used to be connected to the third folded edge 114 and the second side beam 122. There are two third pressing edges 323, both arranged along the second direction, connecting the first pressing edge 321 and the second pressing edge 322, and used to connect the second folded edge 113 and the first side beam 121.

[0114] As shown in Figure 1, the first pressing edge 321 includes an inclined section 3211 and a horizontal section 3212. The position of the inclined section 3211 corresponds to the position of the transition plate, and the position of the horizontal section 3212 corresponds to the position between the two transition plates on the heat exchange plate 11. After the upper cover 30 is fastened onto the lower housing 10, the inclined section 3211 of the first pressing edge 321 is pressed onto the upper surface of the transition plate, and the horizontal section 3212 is pressed onto the heat-conducting plate 111 between the two transition plates.

[0115] As shown in Figure 10, a pressing boss 1233 is provided between the two supporting bosses 1231. During assembly, the inclined section 3211 of the first pressing edge 321, the transition plate, and the supporting boss 1231 are pressed together in sequence; while the horizontal section 3212 of the first pressing edge 321 (see Figure 1), the heat-conducting plate 111 between the two transition plates, and the pressing boss 1233 of the connecting plate 123 (see Figure 10) are pressed together in sequence.

[0116] It should be noted that the transition plate and the support boss 1231 are riveted together by rivet nuts, while the inclined section 3211 of the first pressing edge 321 is fixedly connected to the transition plate by bolts. The bolts pass through the inclined section 3211 and are screwed into the rivet nuts on the transition plate to achieve a fixed connection, so that the inclined section 3211 of the first pressing edge 321 is in close contact with the transition plate, thereby improving the sealing performance.

[0117] Similarly, the area of ​​the heat-conducting plate 111 between the two transition plates and the pressing boss 1233 are also riveted together by rivet nuts. The horizontal section 3212 of the first pressing edge 321 is also fixedly connected to the heat-conducting plate 111 by bolts. After the bolts pass through the horizontal section 3212, they are screwed into the rivet nuts on the heat-conducting plate 111 to achieve a fixed connection, so that the horizontal section 3212 of the first pressing edge 321 is in close contact with the heat-conducting plate 111, thereby improving the sealing performance.

[0118] As shown in Figure 1, the battery pack also includes a limiting block 41. The limiting block 41 is disposed on the outer periphery of the frame 12 and is used to limit the displacement of the battery pack in the second and / or third directions by engaging with the battery pack bracket. This limits the battery pack's displacement on the battery bracket, thereby preventing excessive vibration. It is understood that there is a gap between the outer periphery of the frame 12 and the battery pack bracket. Therefore, under external force, the frame 12 is prone to move relative to the battery pack bracket, causing collisions or wear. By providing the limiting block 41 on the outer periphery of the frame 12, the limiting block 41 can abut against the battery pack bracket and limit the movement, thereby reducing the vibration amplitude of the battery pack.

[0119] The installation position of the limiting block 41 can be determined according to the gap between the frame 12 and the battery pack bracket. For example, if there is a gap between the frame 12 and the battery pack bracket in the third direction, then the limiting block 41 can be set on both sides of the frame 12 in the third direction. If there is a gap between the frame 12 and the battery pack bracket in the second direction, then the limiting block 41 can be set on both sides of the frame 12 in the second direction. If there are gaps between the frame 12 and the battery pack bracket in both the second direction and the third direction, the limiting block 41 can also be set on both sides of the frame 12 in the second direction and on both sides of the frame 12 in the third direction, respectively.

[0120] As shown in Figure 1, the battery pack also includes a sealing ring 50, which is disposed between the upper cover 30 and the lower housing 10 to ensure a sealing fit between them. Specifically, the sealing ring 50 is disposed between the pressing edge 32 and the heat exchange plate 11. Bolts pass through the pressing edge 32, the sealing ring 50, the heat exchange plate 11, and the frame 12, and are tightened with nuts, so that the pressing edge 32 presses the sealing ring 50 onto the heat exchange plate 11, thereby achieving a seal at the joint and improving the sealing effect.

[0121] The battery pack also includes an electrical mounting panel 60, a main positive socket 71, a main negative socket 72, and copper busbars 80. The electrical mounting panel 60 is located at the first end of the cover 31. The copper busbars 80 include a positive copper busbar and a negative copper busbar. The positive copper busbar is electrically connected to the positive terminal of each battery module in the module unit 20, and the negative copper busbar is electrically connected to the negative terminal of each battery module in the module unit 20. The main positive socket 71 and the main socket are located on the mounting panel and are used for electrical connection to external circuitry. Inside the battery pack, the conductive core of the main positive socket 71 is electrically connected to the positive copper busbar, and the conductive core of the main negative socket 72 is electrically connected to the negative copper busbar.

[0122] The battery pack also includes an insulating sheet 91 and a steel strip 92. The steel strip 92 surrounds the outer periphery of each battery module in the module unit 20 to secure the batteries within the module as a whole. As shown in Figure 1, the module unit 20 has a first end and a second end in a second direction. The first end of the module unit 20 corresponds to the first end of the cover 31 of the top cover 30, and a copper busbar 80 is disposed at the first end of the module unit 20. To prevent short circuits caused by contact between the copper busbar 80 and the steel strip 92 on the outer periphery of the module unit 20, the insulating sheet 91 is disposed between the steel strip 92 and the copper busbar 80 of the module unit 20 to improve the reliability of the battery pack.

[0123] As shown in Figure 1, the battery pack also includes a front module beam 42 and a rear module beam 43. The front module beam 42 is disposed at the first end of the heat exchange plate 11 along a third direction, and the rear module beam 43 is disposed at the second end of the heat exchange plate 11 along a third direction. The first end of the module unit 20 is connected to the front module beam 42, and the second end is connected to the rear module beam 43, thereby achieving a fixed connection with the heat exchange plate 11.

[0124] As shown in Figure 10, the connecting plate 123 is also provided with a plurality of connecting bosses 1232. The connecting bosses 1232 are distributed at intervals along the third direction. All connecting bosses 1232 correspond to the front module beam 42. The connecting bosses 1232 are provided with connecting holes. The connecting bosses 1232 are used to connect with the heat exchange plate 11 and the front module beam 42 so that the first end of the module unit 20 is fixedly connected to the front module beam 42.

[0125] For example, the heat exchange plate 11 is connected to the front module beam 42 by rivet nuts, and the connecting plate 123 is fixedly connected to the heat exchange plate 11 by bolts. The rivet nuts rivet the flow channel plate 112, the heat conduction plate 111, and the lower end face of the front module beam 42 of the heat exchange plate 11 in sequence from bottom to top, and the bolts are also inserted into the connecting holes of the connecting boss 1232 from bottom to top and threadedly connected to the rivet nuts, thereby achieving a fixed connection between the connecting plate 123 and the heat exchange plate 11 and the front module beam 42.

[0126] The rear module beam 43 is positioned corresponding to the position of the second eaves 1222. The second eaves 1222, the heat exchange plate 11, and the rear module beam 43 are connected in sequence so that the second end of the module unit 20 is fixedly connected to the rear module beam 43.

[0127] For example, the rivet nuts are used to fix the second eaves 1222, the heat exchange plate 11, and the rear module beam 43 in sequence from bottom to top.

[0128] According to another aspect of this application, an energy storage system comprising the aforementioned battery pack has also been developed.

[0129] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of this application, and this application is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this application, and these modifications and improvements are also considered to be within the scope of protection of this application.

Claims

1. A battery pack, comprising: The lower housing (10), module unit (20), and upper cover (30) are provided, wherein the upper cover (30) is fastened to the lower housing (10) and forms a receiving cavity, and the module unit (20) is connected to the lower housing (10) and located within the receiving cavity. The lower housing (10) comprises: A heat exchange plate (11) has a first side and a second side disposed opposite to each other in a first direction. The first side of the heat exchange plate (11) has a heat exchange surface (1111) for carrying the module unit (20) and exchanging heat with the module unit (20). A frame (12) is connected to the second side of the heat exchange plate (11); A support plate (13) abuts against the second side of the heat exchange plate (11) and is connected to the frame (12). The support plate (13) is fixedly connected to the heat exchange plate (11). The yield strength of the material used for the support plate (13) is greater than that of the material used for the heat exchange plate (11).

2. The battery pack according to claim 1, characterized in that, The heat exchange plate (11) is bonded to the support plate (13).

3. The battery pack according to claim 1, characterized in that, The support plate (13) is made of a different material than the heat exchange plate (11).

4. The battery pack according to claim 3, characterized in that, The heat exchange plate (11) is made of aluminum alloy, the support plate (13) is made of alloy steel, and the heat exchange plate (11) and the support plate (13) are riveted together.

5. The battery pack according to claim 3, characterized in that... The frame (12) is made of the same material as the support plate (13), the heat exchange plate (11) is riveted to the frame (12), and the frame (12) is welded to the support plate (13).

6. The battery pack according to claim 1, characterized in that, The thermal conductivity of the material used for the heat exchange plate (11) is greater than that of the material used for the support plate (13).

7. The battery pack according to claim 1, characterized in that, A connector (14) is provided on the support plate (13), the connector (14) is connected to the heat exchange plate (11), and the support plate (13) is fixedly connected to the heat exchange plate (11) through the connector (14).

8. The battery pack according to claim 7, characterized in that, The support plate (13) has a plurality of protrusions (133), the protrusions (133) abut against the second side of the heat exchange plate (11), and the connector (14) passes through at least a portion of the protrusions (133) so that at least a portion of the protrusions (133) are fixedly connected to the heat exchange plate (11).

9. The battery pack according to claim 8, characterized in that, The heat exchange plate (11) has a plurality of connecting protrusions (1113) on its second side. Among all the protrusions (133), some of the protrusions (133) correspond one-to-one with the connecting protrusions (1113) and abut against each other. The protrusions (133) and the connecting protrusions (1113) that abut against each other are fixedly connected by the connector (14).

10. The battery pack according to claim 9, characterized in that, The protrusions (133) are in multiple groups, and the multiple groups of protrusions (133) are spaced apart in the second direction. The protrusions (133) in the same group are spaced apart in the third direction. At least one of the protrusions (133) in each group corresponds to and abuts against the connecting protrusion (1113). The first direction, the second direction, and the third direction intersect each other.

11. The battery pack according to claim 10, characterized in that, There are multiple support plates (13), each of which is arranged along the third direction. All the support plates (13) are spaced apart along the second direction. At least one of the protrusions (133) on each support plate (13) abuts against the connecting protrusion (1113).

12. The battery pack according to claim 9, characterized in that, The heat exchange plate (11) includes: A heat-conducting plate (111), wherein the heat exchange surface (1111) is located on the heat-conducting plate (111), and the connecting protrusion (1113) is located on the side of the heat-conducting plate (111) away from the heat exchange surface (1111); The flow channel plate (112) is fastened to the side of the heat-conducting plate (111) away from the heat exchange surface (1111). The flow channel plate (112) is provided with a relief opening (1121) corresponding to the connecting protrusion (1113). The connecting protrusion (1113) passes through the relief opening (1121).

13. The battery pack according to claim 12, characterized in that, A first groove (1114) is formed on the heat exchange surface (1111) at a position corresponding to the connecting protrusion (1113).

14. The battery pack according to claim 8, characterized in that, The support plate (13) is provided with reinforcing ribs (132) along the third direction on the side facing the heat exchange plate (11); In the third direction, a plurality of protrusions (133) are spaced apart on the reinforcing rib (132), and a clearance groove (134) is formed between adjacent protrusions (133) in the second direction, wherein the first direction, the second direction, and the third direction intersect each other; The heat exchange plate (11) has a first refrigerant flow channel arranged along the second direction inside. The outer wall of the first refrigerant flow channel forms a protrusion structure (1124) on the second side of the heat exchange plate (11). The protrusion structure (1124) passes through the relief groove (134) and is clearance-fitted with the inner wall of the relief groove (134).

15. The battery pack according to claim 14, characterized in that, There are multiple first refrigerant channels, which are distributed at intervals in the third direction. The outer wall of each first refrigerant channel forms a protrusion structure (1124) on the second side of the heat exchange plate (11), and a second groove (1125) is formed between two adjacent protrusion structures (1124). Of all the protrusions (133), some of the protrusions (133) correspond one-to-one with the second groove (1125) and abut against the corresponding second groove (1125).

16. The battery pack according to claim 14, characterized in that, There are multiple reinforcing ribs (132), which are spaced apart along the second direction, and each reinforcing rib (132) is provided with multiple protrusions (133).

17. The battery pack according to claim 8, characterized in that, In the first direction, the frame (12) has a first side away from the heat exchange plate (11) and a second side facing the heat exchange plate (11), the outer periphery of the heat exchange plate (11) is connected to the second side of the frame (12), the support plate (13) is connected to the first side of the frame (12), and the heat exchange plate (11) and the support plate (13) clamp and fix the frame (12).

18. The battery pack according to claim 17, characterized in that, In a third direction intersecting the first direction, the support plate (13) has two oppositely arranged ends, and the two ends of the support plate (13) are respectively formed with first flanges (1311). The support plate (13) is connected to the first side of the frame (12) through the first flanges (1311). Of all the protrusions (133), some of the protrusions (133) are spaced apart along the third direction. The first and last of the protrusions (133) spaced apart along the third direction are located at both ends of the support plate (13) and are adjacent to the corresponding first folded edge (1311). The first and last of the protrusions (133) spaced apart along the third direction are connected to the first side of the frame (12).

19. The battery pack according to claim 18, characterized in that, The framework (12) includes: The first side beam (121) is arranged along the second direction and has a first end and a second end. There are two first side beams (121), and the two first side beams (121) are arranged at intervals in the third direction. The first direction, the second direction and the third direction intersect each other. The second side beam (122) is arranged along the third direction, and the two ends of the second side beam (122) are respectively connected to the first ends of the two first side beams (121); A connecting plate (123) is provided along the third direction. The two ends of the connecting plate (123) are respectively connected to the second ends of the two first side beams (121). The first side beams (121), the second side beams (122) and the connecting plate (123) form a frame structure. The first flange (1311) at the same end of the support plate (13) and the protrusion (133) adjacent to the first flange (1311) are both connected to the same first side beam (121).

20. The battery pack according to claim 19, characterized in that, The first side beam (121) includes: A first beam (1211) extends along the second direction. The first beam (1211) has a first connecting surface (1211a) and a second connecting surface (1211b) that are oppositely arranged in the first direction. The first connecting surface (1211a) is located on the first side of the frame (12), and the second connecting surface (1211b) is located on the second side of the frame (12). A first eave (1212) is provided along the second direction and located on the side of the first beam (1211) facing another first side beam (121). The first eave (1212) has a third connecting surface (1212a) and a fourth connecting surface (1212b) arranged opposite to each other in the first direction. The third connecting surface (1212a) is located on the first side of the frame (12), and the fourth connecting surface (1212b) is located on the second side of the frame (12). The first folded edge (1311) is connected to the first connecting surface (1211a), the protrusion (133) adjacent to the first folded edge (1311) is connected to the third connecting surface (1212a), and the heat exchange plate (11) is simultaneously connected to the second connecting surface (1211b) and the fourth connecting surface (1212b).

21. The battery pack according to claim 20, characterized in that, The first connecting surface (1211a) is provided with a mounting groove (1213), and the first folded edge (1311) is located in the mounting groove (1213).

22. The battery pack according to claim 20, characterized in that, The heat exchange plate (11) includes: A heat-conducting plate (111) has a first side and a second side disposed opposite to each other in a first direction. The heat exchange surface (1111) is located on the first side of the heat-conducting plate (111), and the second side of the heat-conducting plate (111) has a fastening surface (1112). The flow channel plate (112) is fastened to the fastening surface (1112) of the heat-conducting plate (111), and the edge of the flow channel plate (112) is connected to the heat-conducting plate (111) and the fourth connecting surface (1212b) respectively. The second fold (113) is connected to the heat-conducting plate (111) on both sides of the third upward side, and the second fold (113) is riveted to the second connecting surface (1211b).

23. The battery pack according to claim 22, characterized in that, In the second direction, the heat-conducting plate (111) has a first end and a second end, and the first end of the heat-conducting plate (111) is used to connect with the connecting plate (123); At the first end of the heat-conducting plate (111), a transition structure (115) is formed at the connection position between the second fold (113) and the heat-conducting plate (111). The transition structure (115) has a first abutting surface (1151) facing the upper cover (30) and a second abutting surface (1152) facing the connecting plate (123). The first abutting surface (1151) is connected to the heat exchange surface (1111) for fitting and abutting against the upper cover (30). The second abutting surface (1152) is connected to the fastening surface (1112). The connecting plate (123) is provided with a support boss (1231) corresponding to the transition structure (115), and the support boss (1231) is attached to and abuts against the second abutting surface (1152).

24. The battery pack according to claim 23, characterized in that, The first contact surface (1151) and the heat exchange surface (1111) are connected at an angle A, and the value of the angle A is in the range of 90° < A < 180°.

25. The battery pack according to claim 23, characterized in that, The upper cover (30) has a first end and a second end along the second direction. The first end of the upper cover (30) corresponds to the first end of the heat-conducting plate (111). The first end of the upper cover (30) has a first pressing edge (321). An inclined section (3211) matching the transition structure (115) is formed on the first pressing edge (321). The inclined section (3211) of the first pressing edge (321) is pressed onto the first abutting surface (1151).

26. The battery pack according to claim 1, characterized in that, The battery pack also includes: A limiting block (41) is disposed on the outer periphery of the frame (12) for limiting cooperation with the battery pack bracket to restrict the displacement of the battery pack in a second direction and / or a third direction, wherein the first direction, the second direction and the third direction intersect each other.

27. The battery pack according to claim 1, characterized in that, The battery pack also includes: A sealing ring (50) is disposed between the upper cover (30) and the lower housing (10) to provide a sealing fit between the upper cover (30) and the lower housing (10).

28. The battery pack according to claim 1, characterized in that, The battery pack also includes: An insulating sheet (91) is disposed between the steel strip (92) and the copper busbar (80) of the module unit (20) to prevent the steel strip (92) and the copper busbar (80) from short-circuiting upon contact.

29. An energy storage system, characterized in that, The battery pack includes any one of claims 1 to 28.

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