Battery pack and energy storage system

Abstract

The invention provides a battery pack and an energy storage system.The battery pack comprises a lower box body, module units and an upper cover, the upper cover is arranged on the lower box body in a buckled mode and defines a containing cavity, the module units are connected to the lower box body and located in the containing cavity, the lower box body comprises a heat exchange plate, and the heat exchange plate is provided with a first side and a second side which are oppositely arranged in the first direction; the first side of the heat exchange plate is provided with a heat exchange face used for bearing the module unit and exchanging heat with the module unit. The frame is connected to the second side of the heat exchange plate; the supporting plate abuts against the second side of the heat exchange plate and is connected with the frame, and the supporting plate is fixedly connected with the heat exchange plate; wherein the yield strength of a material used by the supporting plate is greater than that of a material used by the heat exchange plate. According to the battery pack, by improving the supporting strength of the supporting plate, the upper bearing limit of the supporting plate is improved, the bearing capacity of the lower box body is effectively improved, the lower box body can bear larger module units, and therefore the energy density of the battery pack is improved.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to a battery pack and an energy storage system. Background Art

[0002] With the development of new energy storage systems, batteries are moving towards large capacity and large size. For lithium iron phosphate batteries commonly used for energy storage, the increasing battery capacity further increases the size and weight of the battery itself.

[0003] In some related technologies, a long lower box is usually used in the battery pack, which can carry two 13-string battery modules in the length direction. There will be an intermediate module beam in the middle of the lower box. However, when the battery is heavy and the number of battery strings exceeds 13, such as modules with more than 16 strings, the carrying capacity of the lower box will be insufficient, thereby limiting the energy density of the battery pack. Summary of the invention

[0004] The present invention aims to at least solve the problem in the prior art that the lower box body of the battery pack has insufficient load-bearing capacity, thereby limiting the energy density of the battery pack, and proposes a battery pack and an energy storage system.

[0005] In order to achieve the purpose of the present invention, a battery pack is provided, comprising: a lower box body, a module unit and an upper cover, wherein the upper cover is buckled on the lower box body and surrounds a accommodating cavity, the module unit is connected to the lower box body and is located in the accommodating cavity, and the lower box body comprises: a heat exchange plate, which 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 has 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; a support plate, which abuts against the second side of the heat exchange plate and is connected to the frame, and the support plate is 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] Optionally, the heat exchange plate is bonded to the support plate.

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

[0008] Optionally, the heat exchange plate is made of aluminum alloy, the support plate is made of alloy steel, and the heat exchange plate and the support plate are riveted.

[0009] Optionally, the frame is made of the same material as the support plate, the heat exchange plate and the frame are riveted, and the frame and the support plate are welded.

[0010] Optionally, the thermal conductivity of the material used for the heat exchange plate is greater than the thermal conductivity of the material used for the support plate.

[0011] Optionally, 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 via the connector.

[0012] Optionally, the support plate has a plurality of protrusions, the protrusions abut against the second side of the heat exchange plate, and the connecting member is passed through at least part of the protrusions to fix at least part of the protrusions to the heat exchange plate.

[0013] Optionally, the second side of the heat exchange plate has a plurality of connecting protrusions, and among all the protrusions, some of the protrusions correspond to and abut against the connecting protrusions one by one, and the protrusions and the connecting protrusions abutting against each other are fixedly connected by the connecting piece.

[0014] Optionally, the protrusions are in multiple groups, and the multiple groups of protrusions are spaced apart in the second direction, and 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] Optionally, there are multiple support plates, each of which is arranged along the third direction, all of the support plates are spaced apart along the second direction, and at least one of the protrusions on each of the support plates abuts against the connecting protrusion.

[0016] Optionally, the heat exchange plate includes: a heat conducting plate, 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 away from the heat exchange surface; a flow channel plate, which is snap-fitted with the side of the heat conducting plate away from the heat exchange surface, and the flow channel plate is provided with a avoidance opening corresponding to the connecting protrusion, and the connecting protrusion is inserted into the avoidance opening.

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

[0018] Optionally, reinforcing ribs are provided on one side of the support plate facing the heat exchange plate along a third direction; in the third direction, a plurality of the protrusions are spaced apart on the reinforcing ribs, and avoidance grooves penetrating in the second direction are formed between adjacent protrusions, and the first direction, the second direction, and the third direction intersect each other; a first refrigerant flow channel is provided inside the heat exchange plate along the second direction, and an outer wall of the first refrigerant flow channel forms a protrusion structure on the second side of the heat exchange plate, the protrusion structure is penetrated in the avoidance groove, and the protrusion structure is gap-matched with the inner wall of the avoidance groove.

[0019] Optionally, there are multiple first refrigerant flow channels, and the multiple first refrigerant flow channels are spaced apart in the third direction. The outer wall of each first refrigerant flow channel forms a corresponding 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 to the second grooves one by one and abut against the corresponding second grooves.

[0020] Optionally, there are multiple reinforcing ribs, and the multiple reinforcing ribs are spaced apart along the second direction, and each of the reinforcing ribs is provided with multiple protrusions.

[0021] Optionally, in the first direction, the frame has a first side facing 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] Optionally, in a third direction intersecting with the first direction, the support plate has two oppositely arranged ends, and a first folded edge is respectively formed at the two ends of the support plate, and the support plate is connected to the first side of the frame through the first folded edge; among all the raised portions, some of the raised portions are arranged at intervals along the third direction, and the first and last of the raised portions arranged at intervals along the third direction are respectively located at the two ends of the support plate and are adjacent to the corresponding first folded edges, and the first and last of the raised portions arranged at intervals along the third direction are connected to the first side of the frame.

[0023] Optionally, the frame includes: a first side beam, which is arranged along the second direction and has a first end and a second end, there are two first side beams, and the two first side beams are arranged at intervals in the third direction, and the first direction, the second direction and the third direction intersect each other; a second side beam, which is arranged along the third direction, and the two ends of the second side beam are respectively connected to the first ends of the two first side beams; a connecting plate, which is arranged along the third direction, and the two ends of the connecting plate are respectively connected to the second ends of the two first side beams, and the first side beam, the second side beam and the connecting plate form a frame-like structure; the first folded edge at the same end of the support plate and the protrusion adjacent to the first folded edge are both connected to the same first side beam.

[0024] Optionally, 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 relatively set in the first direction, the first connecting surface is located on the first side of the frame, and the second connecting surface is located on the second side of the frame; a first convex eaves arranged along the second direction and located on the side of the first beam body facing the other first side beam, the first convex eaves having a third connecting surface and a fourth connecting surface relatively set in the first direction, the third connecting surface is located on the first side of the frame, and the fourth connecting surface is located on the second side of the frame; the first folded edge is connected to the first connecting surface, the raised portion adjacent to the first folded edge is connected to the third connecting surface, and the heat exchange plate is simultaneously connected to the second connecting surface and the fourth connecting surface.

[0025] Optionally, a mounting groove is provided on the first connecting surface, and the first folded edge is located in the mounting groove.

[0026] Optionally, the heat exchange plate includes: a heat conducting plate having a first side and a second side relatively arranged in a first direction, the heat exchange surface is located on the first side of the heat conducting plate, and the second side of the heat conducting plate has a snap-fit ​​surface; a flow channel plate snap-fitted with the snap-fit ​​surface of the heat conducting plate, the edges of the flow channel plate are respectively connected to the heat conducting plate and the fourth connecting surface; a second folded edge is connected to the edges of both sides of the heat conducting plate in the third direction, and the second folded edge is riveted to the second connecting surface.

[0027] Optionally, in the second direction, the heat conducting plate has a first end and a second end, and the first end of the heat conducting plate is used to be connected to the 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, and the transition structure has a first abutting surface facing the upper cover and a second abutting surface facing the connecting plate, the first abutting surface is connected to the heat exchange surface and is used to fit and abut with the upper cover, and the second abutting surface is connected to the buckling surface; a supporting boss corresponding to the transition structure is provided on the connecting plate, and the supporting boss fits and abuts with the second abutting surface.

[0028] Optionally, an angle A is formed at a position where the first abutting surface is connected to the heat exchange surface, and a value range of the angle A is 90°<A<180°.

[0029] Optionally, the upper cover has a first end and a second end along the second direction, the first end of the upper cover corresponds to the first end of the heat conduction plate, the first end of the upper cover has a first pressing edge, an inclined section matching the transition structure is formed on the first pressing edge, and the inclined section of the first pressing edge is pressed onto the first abutting surface.

[0030] Optionally, the battery pack further includes: a limit block, arranged on the outer peripheral side of the frame, for cooperating with the battery pack bracket to limit the displacement of the battery pack in the second direction and / or the third direction, the first direction, the second direction and the third direction intersecting each other.

[0031] Optionally, the battery pack further includes: a sealing ring, disposed between the upper cover and the lower box body, so as to ensure a sealing fit between the upper cover and the lower box body.

[0032] Optionally, the battery pack further includes: an insulating sheet, disposed between the steel strip and the copper busbar of the module unit, for preventing the steel strip and the copper busbar from short-circuiting due to contact.

[0033] According to a second aspect of the present invention, an energy storage system is also disclosed, comprising the above-mentioned battery pack.

[0034] The battery pack of the present invention improves the support strength of the support plate to increase the upper limit of the support plate's load-bearing capacity, thereby effectively improving the support strength of the lower box. Furthermore, since 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, the bearing capacity of the lower box is effectively improved, and the middle module beam is eliminated, so that the lower box can carry a larger module unit, thereby improving the energy density of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of the structure of a battery pack according to an embodiment of the present invention;

[0036] Figure 2 It is a schematic structural diagram of the lower box of the battery pack according to an embodiment of the present invention;

[0037] Figure 3 A side view of a lower box of a battery pack according to an embodiment of the present invention;

[0038] Figure 4 for Figure 3 A partial enlarged view of part B;

[0039] Figure 5 for Figure 3 A partial enlarged view of part C in the middle;

[0040] Figure 6 It is a schematic diagram of assembling the frame and the support frame of an embodiment of the present invention;

[0041] Figure 7 A schematic diagram of the structure of the first side beam according to an embodiment of the present invention

[0042] Figure 8 A schematic diagram of the structure of a support beam according to an embodiment of the present invention;

[0043] Fig. 9is a schematic structural diagram of the back side of the flow channel plate according to an embodiment of the present invention;

[0044] Fig.10 A schematic diagram of the structure of a connecting plate according to an embodiment of the present invention;

[0045] Fig.11 for Figure 2 A partial enlarged view of part A;

[0046] Fig.12 A side view of a heat exchange plate in a second direction according to an embodiment of the present invention;

[0047] List of reference numerals:

[0048] 10. lower box; 11. heat exchange plate; 111. heat conduction plate; 1111. heat exchange surface; 1112. buckling surface; 1113. connecting protrusion; 1114. first groove; 112. flow channel plate; 1121. avoidance port; 1122. first flow channel groove; 1123. second flow channel groove; 1124. protrusion structure;

[0049] 1125, second groove; 1126, buffer groove; 113, second folding edge; 114, third folding edge;

[0050] 115. transition structure; 1151. first abutting surface; 1152. second abutting surface; 12. frame;

[0051] 121, first side beam; 1211, first beam body; 1211a, first connecting surface; 1211b, second connecting surface; 1212, first convex eave; 1212a, third connecting surface; 1212b, fourth connecting surface; 122, second side beam; 1221, second beam body; 1222, second convex eave; 1213, mounting groove; 1214, lifting hole; 123, connecting plate; 1231, supporting boss; 1232, connecting boss; 1233, pressing boss; 13, supporting plate; 131, plate body; 1311, first folding edge; 132, reinforcing rib; 133, protrusion; 1331, first protrusion; 1332, second protrusion; 1333, third protrusion; 134, avoidance groove; 14, connecting piece; 20, module unit; 30, upper cover;

[0052] 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 installation panel; 71. Main positive socket; 72. Main negative socket; 80. Copper busbar; 91. Insulating sheet; 92. Steel belt. DETAILED DESCRIPTION

[0053] In order to enable those skilled in the art to better understand the technical solution of the present invention, the battery pack and energy storage system provided by the present invention are described in detail below with reference to the accompanying drawings.

[0054] With the development of new energy storage systems, batteries are moving towards large capacity and large size. For lithium iron phosphate batteries commonly used for energy storage, the increasing battery capacity further increases the size and weight of the battery itself.

[0055] In some related technologies, a long lower box is usually used in the battery pack, which can carry two 13-string battery modules in the length direction. There will be an intermediate module beam in the middle of the lower box. However, when the battery is heavy and the number of battery strings exceeds 13, such as modules with more than 16 strings, the carrying capacity of the lower box will be insufficient, thereby limiting the energy density of the battery pack.

[0056] The existing lower box usually includes: a cold plate, a frame and a reinforcing plate, and is used to cool the battery module. The frame is connected around the cold plate as the main body that bears the weight. The reinforcing plate is connected to the frame to strengthen the frame structure to improve the load-bearing capacity.

[0057] Normally, the cold plate needs to use aluminum profiles with good thermal conductivity. In order to ensure the reliability of welding with the cold plate, the frame and reinforcement ribs are usually made of the same material, that is, aluminum profiles. However, the bearing capacity of aluminum profiles is worse than that of steel profiles, which will lead to poor overall bearing capacity of the lower box.

[0058] Although steel profiles have a stronger structure than aluminum profiles, their thermal conductivity is poor. Therefore, if steel profiles are used as cold plate materials, the thermal conductivity efficiency will be reduced, thereby affecting the cooling effect of the cold plate on the battery module.

[0059] In order to solve the above problems, Figures 1 to 11 As shown, the invention discloses a battery pack for use in an energy storage system. The battery pack includes: a lower box 10, a module unit 20 and an upper cover 30, wherein the upper cover 30 is buckled on the lower box 10 and surrounds a receiving cavity, and the module unit 20 is connected to the lower box 10 and is located in the receiving cavity.

[0060] like Figure 1 As shown, the thickness direction of the battery pack is the first direction, that is, the x-axis direction; the length direction of the battery pack is the second direction, that is, the y-axis direction; the width direction of the battery pack is the third direction, that is, the z-axis direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0061] It is understandable that if Figure 1As shown, the lower box 10, the module unit 20 and the upper cover 30 are arranged in sequence along the first direction, the thickness direction of the lower box 10 is arranged along the first direction; the length direction of the lower box 10 is arranged along the second direction; the width direction of the lower box 10 is arranged along the third direction.

[0062] like Figure 2 As shown, the lower box 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, and 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; Figure 3 and Figure 4 As shown, 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, and 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.

[0063] The battery pack of the present invention is connected to the heat exchange plate 11 by fixing the support plate 13 of the lower box 10, so that the heat exchange plate 11, the frame 12 and the support plate 13 are connected to each other in pairs, and then relatively fixed, so that the entire lower box 10 forms a whole. Since 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, it is equivalent to improving the support strength of the support plate 13, so that the upper limit of the load-bearing capacity of the support plate 13 is increased, that is, the support strength of the entire lower box 10 is increased, so that the bearing capacity of the lower box 10 is effectively improved. Therefore, the middle module beam can be omitted, and the saved space can carry a larger module unit 20, thereby improving the energy density of the battery pack.

[0064] It should be noted that the support plate 13 and the heat exchange plate 11 can be fixedly connected by bonding, welding, riveting, etc. Without violating the inventive principle and inventive concept of the present invention, the above situations are within the protection scope of the present invention.

[0065] It should also be noted that, in the present embodiment, the module unit 20 includes at least one battery module. The larger the module unit is, the more battery modules therein are, and thus the energy density is correspondingly higher.

[0066] Furthermore, the support plate 13 and the heat exchange plate 11 are made of different materials. For example, the heat exchange plate 11 can be made of aluminum alloy, the support plate 13 can be made of alloy steel, and the heat exchange plate 11 and the support plate 13 can be riveted. In addition, the heat exchange plate 11 can also be made of copper alloy and other materials, and the support plate 13 can also be made of titanium alloy and other materials.

[0067] It should be noted that, although in this embodiment, the support plate 13 and the heat exchange plate 11 are made of different materials, this is not restrictive. In some other embodiments not shown in the figure, 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 alloy, but with different alloy proportions. The above situations are all within the protection scope of the present invention without violating the inventive principle and inventive concept of the present invention.

[0068] Furthermore, the thermal conductivity of the material used for the heat exchange plate 11 is greater than the thermal conductivity of the material used for the support plate 13 .

[0069] Compared with the prior art, since the materials of the support plate 13 and the heat exchange plate 11 are different, the heat exchange plate 11 can be made of a material with a higher thermal conductivity, while the support plate 13 can be made of a material with a higher yield strength, thereby improving the bearing capacity of the lower box 10 while ensuring the heat dissipation effect of the module unit 20.

[0070] like Figure 5 As shown, a connector 14 is provided on the support plate 13 , and the connector 14 is connected to the heat exchange plate 11 .

[0071] For example, the connection member 14 may be a bolt, a rivet, etc., to achieve screw connection or riveting connection between the support plate 13 and the heat exchange plate 11 .

[0072] The battery pack of the present invention is provided with a connector 14 on the support plate 13 of the lower box body 10, so that the support plate 13 made of different materials is fixedly connected to the heat exchange plate 11 through the connector 14, thereby realizing the mutual connection between the heat exchange plate 11, the frame 12 and the support plate 13, and then relatively fixed, so that the entire lower box body 10 forms a whole, thereby improving the overall strength, and improving the bearing capacity of the lower box body 10. The middle module beam can be omitted, and at the same time a larger module unit 20 can be carried, thereby improving the energy density of the battery pack.

[0073] In addition, since the support plate 13 and the heat exchange plate 11 are made of different materials, the support plate 13 and the heat exchange plate 11 cannot be directly fixedly connected by welding. If the two 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 easy to move relative to each other, so that the entire lower box 10 cannot form a whole, but will reduce the bearing capacity of the lower box 10. By arranging the connecting piece 14 on the support plate 13, the fixed connection between the support plate 13 and the heat exchange plate 11 can be achieved through the connecting piece 14, which will not be affected by different materials, so that the support plate 13 and the heat exchange plate 11 can be reliably connected, so that the entire lower box 10 forms a whole, and the bearing capacity of the lower box 10 is improved.

[0074] Exemplarily, the heat exchange plate 11 is made of aluminum alloy, the support plate 13 is made of alloy steel (e.g., high-strength steel), and the heat exchange plate 11 and the support plate 13 are riveted together by a connector 14, such as an SPR riveting process. By using aluminum alloy as the material of the heat exchange plate 11, since the thermal conductivity of aluminum alloy is generally between 130-220W / (m·K), and the thermal conductivity of alloy steel is generally between 10-50W / (m·K), compared with alloy steel, aluminum alloy has excellent thermal conductivity, thereby 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 280MPa and 320MPa, while the yield strength of some alloy steels can reach 600MPa or higher, therefore, using alloy steel as the support plate 13 can effectively increase the bearing capacity of the lower box 10. By riveting, the heat exchange plate 11 and the support plate 13 can be fixedly connected, so that the entire lower box body 10 can be formed into a whole while ensuring heat exchange, thereby improving the bearing capacity of the lower box body 10.

[0075] Furthermore, the material of the frame 12 is the same as that of 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 material of the frame 12 the same as that of the support plate 13, the strength of the frame 12 is improved, and at the same time, since the material of the frame 12 and the support plate 13 is the same as that of the support plate 13, a reliable connection can be achieved by welding. Although the heat exchange plate 11 and the frame 12 are made of different materials, the heat exchange plate 11 and the frame 12 can be reliably connected by riveting.

[0076] like Figure 6 As shown, in this embodiment, there are multiple support plates 13, and the length direction of each support plate 13 is arranged along the third direction, and the width direction is arranged along the second direction. In the third direction, both ends of the support plate 13 are respectively connected to the frame 12. Multiple support plates 13 are distributed at intervals in the second direction. Each support plate 13 is against the heat exchange plate 11 and is riveted to the heat exchange plate 11. On the one hand, it can form multi-point support for the heat exchange plate 11, so that the heat exchange plate 11 is evenly supported, thereby improving the overall strength. In addition, each support plate 13 is riveted to the heat exchange plate 11, which can achieve multi-point connection, disperse the stress generated by the connection, and avoid stress concentration.

[0077] like Figure 8As shown, the support plate 13 includes: a plate body 131, a reinforcing rib 132 arranged on the plate body 131, and a protrusion 133 arranged on the reinforcing rib 132. The length direction of the plate body 131 is arranged along the third direction, and the width direction of the plate body 131 is arranged along the second direction. The protrusion direction of the reinforcing rib 132 faces the heat exchange plate 11, and there are multiple reinforcing ribs 132, each of which is arranged along the third direction, and the multiple reinforcing ribs 132 are spaced apart along the second direction. There are also multiple protrusions 133, and each reinforcing rib 132 is provided with multiple protrusions 133, and the protrusions 133 on each reinforcing rib 132 are spaced apart along the third direction.

[0078] It should be noted that in this embodiment, there are five reinforcing ribs 132, but this is not restrictive. 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 some other embodiments not shown in the figure, it is also feasible not to set the reinforcing ribs 132 and directly set the protrusions 133 on the plate body 131. However, in this embodiment, by setting the reinforcing ribs 132, the strength of the support plate 13 can be improved, so that the bearing capacity of the lower box body 10 is effectively improved.

[0079] Combination Figures 3 to 5 It can be seen that in this embodiment, the protrusion 133 is protruded in the first direction and faces the heat exchange plate 11, the protrusion 133 abuts against the second side of the heat exchange plate 11, and the connecting member 14 is passed 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. By having a plurality of protrusions 133 abut against the heat exchange plate 11, the heat exchange plate 11 can be supported in the first direction, and at the same time, by having a portion of the protrusions 133 fixedly connected to the heat exchange plate 11, the connection strength is improved, relative shaking is avoided, and the structural strength is improved.

[0080] In this embodiment, the second side of the heat exchange plate 11 has a plurality of connecting protrusions 1113, and among all the protrusions 133, some of the protrusions 133 correspond to and abut against the connecting protrusions 1113 one by one, and the protrusions 133 and the connecting protrusions 1113 abutting against each other are fixedly connected by the connecting member 14. By forming the connecting protrusions 1113 on the second side of the heat exchange plate 11, on the one hand, it can correspond to and abut against some of the protrusions 133 one by one to form effective contact, and then cooperate with the connecting member 14 to achieve reliable connection. On the other hand, due to the existence of the connecting protrusions 1113, a certain distance is formed between the connecting position of the abutting protrusions 133 and the connecting protrusions 1113 and the heat exchange surface 1111, which can avoid the deformation of the connecting position during riveting to form a protrusion on the heat exchange surface 1111, 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.

[0081] Exemplarily, the multi-protrusion portion 133 includes: a first protrusion 1331. Figure 5 and Figure 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. Figure 5 As shown, 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 the connecting member 14 is passed through the first protrusion 1331 and fixedly connects the first protrusion 1331 and the connecting protrusion 1113. By forming the connecting protrusion 1113 on the second side of the heat exchange plate 11, on the one hand, it can cooperate with the first protrusion 1331 to form an effective contact, and then cooperate with the connecting member 14 to achieve a reliable connection. On the other hand, due to the existence of the connecting protrusion 1113, a certain distance is formed between the connecting position of the first protrusion 1331 and the connecting protrusion 1113 and the heat exchange surface 1111, which can avoid the deformation of the connecting position during riveting to form a protrusion on the heat exchange surface 1111, 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. It can be understood that there are multiple first protrusions 1331 and multiple connecting protrusions 1113, and each first protrusion 1331 corresponds to one connecting protrusion 1113, so as to improve the reliability of the connection.

[0082] Combination Figure 2 , Figure 5 and Figure 7 It can be seen that in this embodiment, there are multiple groups of protrusions 133, and the multiple groups of protrusions 133 are spaced apart in the second direction, and the same group of protrusions 133 are spaced apart in the third direction, and at least one of the protrusions 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 of protrusions 133 corresponds to and abuts against the connecting protrusion 1113.

[0083] For example, Figure 8 As shown, the first protrusions 1331 are multiple groups, and the multiple groups of first protrusions 1331 are spaced apart in the second direction, and the first protrusions 1331 of the same group are spaced apart in the third direction. In other words, the first protrusions 1331 of the same group are located on the same reinforcing rib 132, while the first protrusions 1331 of different groups are located on different reinforcing ribs 132, thereby forming a matrix distribution. By forming a matrix distribution, a single support plate 13 is connected and fixed to the heat exchange plate 11 through the first protrusions 1331 and the connecting protrusions 1113 distributed in a matrix, thereby making the force points more dispersed, the force more uniform, and reducing stress concentration.

[0084] It should be noted that the first protrusions 1331 on each reinforcing rib 132 may be the same or different, and the number of first protrusions 1331 provided on the reinforcing rib 132 is not limited, and may be zero, one, two, three, etc. Taking this embodiment as an example, three first protrusions 1331 are provided on the two outermost reinforcing ribs 132, two first protrusions 1331 are provided on the middle reinforcing rib 132, and no first protrusions 1331 are provided on the remaining two reinforcing ribs 132. In addition, the first protrusions 1331 on different reinforcing ribs 132 are aligned in the second direction, for example: 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.

[0085] It can be understood that each support plate 13 is arranged along the third direction, all support plates 13 are spaced apart along the second direction, and at least one protrusion 133 on each support plate 13 abuts against the connecting protrusion 1113. In other words, when there are multiple support plates 13, at least one first protrusion 1331 on each support plate 13 abuts against the 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. In this way, the weight received by the heat exchange plate 11 can be evenly distributed to each support plate 13, and then further dispersed through each first protrusion 1331 and the connecting protrusion 1113, thereby reducing stress concentration and improving the bearing capacity of the lower box 10.

[0086] like Figure 2 and Figure 5 As shown, 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 the first direction, a heat exchange surface 1111 is located on the first side of the heat conducting plate 111, and a buckling surface 1112 is provided on the second side of the heat conducting plate 111. A 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 buckling surface 1112; the flow channel plate 112 is buckled with the side of the heat conducting plate 111 away from the heat exchange surface 1111, that is, the flow channel plate 112 is buckled and connected to the buckling surface 1112, and a avoidance opening 1121 corresponding to the connecting protrusion 1113 is provided on the flow channel plate 112, and the connecting protrusion 1113 is penetrated in the avoidance opening 1121.

[0087] Combination Figure 2 and Figure 5It can be seen that the connection protrusion 1113 is located on the buckling surface 1112 of the heat exchange plate 11, and the flow channel plate 112 is provided with a avoidance opening 1121 corresponding to the connection protrusion 1113. After the flow channel plate 112 and the heat exchange plate 11 are buckled, the connection protrusion 1113 passes through the avoidance opening 1121, so as to abut against the first protrusion 1331. This arrangement is equivalent to forming a clamping force between the heat conduction plate 111 and the support plate 13 after they are riveted, so that the flow channel plate 112 can fit more closely with the heat conduction plate 111, thereby improving the reliability of the connection between the heat conduction plate 111 and the flow channel plate 112.

[0088] like Figure 2 and Figure 5 As shown, a first groove 1114 is formed on the heat exchange surface 1111 at a position corresponding to the connecting protrusion 1113. That is to say, after the heat exchange surface 1111 is recessed toward the side of the buckling surface 1112 on the heat conductive plate 111, a connecting protrusion 1113 is formed on the side away from the heat exchange surface 1111. Therefore, a first groove 1114 is formed at a corresponding position of the heat exchange surface 1111. By adopting this method, after the first protrusion 1331 is riveted to the connecting protrusion 1113, due to the existence of the first groove 1114, even if the riveting position is slightly deformed, it is located in 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 ensured, thereby ensuring effective contact between the heat exchange surface 1111 and the module unit 20, and ensuring heat exchange efficiency.

[0089] like Figure 2 As shown, on the front side of the flow channel plate 112, that is, on the side facing the heat transfer plate 111, a first flow channel groove 1122 and a second flow channel groove 1123 are respectively provided. The first flow channel groove 1122 is provided along the second direction, and there are a plurality of first flow channel grooves 1122, and the plurality of first flow channel grooves 1122 are spaced apart along the third direction. The second flow channel groove 1123 is provided along the third direction, and adjacent first flow channel grooves 1122 are connected through the second flow channel groove 1123. When the flow channel plate 112 is fastened and welded to the heat transfer plate 111, the first flow channel groove 1122 and the fastening surface 1112 of the heat exchange plate 11 enclose a first refrigerant flow channel provided along the second direction, and the second flow channel groove 1123 and the fastening surface 1112 of the heat exchange plate 11 enclose a second refrigerant flow channel provided along the third direction.

[0090] It can be understood that the outer wall of the first refrigerant flow channel forms a convex structure 1124 on the second side of the heat exchange plate 11. This is because the first flow channel groove 1122 is formed by being recessed from the front side to the back side of the flow channel plate 112. Fig. 9As shown, on the back side of the flow channel plate 112, that is, the side away from the heat exchange plate 11, a protruding structure 1124 is formed at the position corresponding to the first flow channel groove 1122, and the back side of the flow 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 flow channel groove 1122, that is, the first refrigerant flow channel.

[0091] like Figure 3 and Figure 4 As shown, an avoidance groove 134 penetrating in the third direction is formed between adjacent protrusions 133, and the protrusion structure 1124 is arranged in the avoidance groove 134, and the protrusion structure 1124 is gap-matched with the inner wall of the avoidance groove 134. By forming the avoidance groove 134 between adjacent protrusions 133, the protrusion structure 1124 formed on the back side of the flow channel plate 112, that is, the second side of the heat exchange plate 11, of the first refrigerant flow channel is arranged in the avoidance groove 134 and gap-matched with the avoidance groove 134, that is, the protrusion structure 1124 does not contact the inner wall of the avoidance groove 134, thereby avoiding vibration friction or collision that may cause the flow channel to rupture. At the same time, as shown in FIG. Figure 5 As shown, due to the riveting between the first protrusion 1331 and the connecting protrusion 1113, the positions of the protrusion structure 1124 and the avoidance groove 134 are relatively fixed, which can further prevent the two from moving relative to each other, thereby effectively avoiding collision or friction between the two. Moreover, the support plate 13 can also play a certain protective role on the first refrigerant flow channel, thereby improving the reliability of the heat exchange plate 11.

[0092] Please combine Figure 4 and Figure 8 As shown, there are multiple first refrigerant flow channels, and the multiple first refrigerant flow channels are spaced apart in the third direction, that is, the outer wall of each first refrigerant flow channel forms a convex structure 1124 corresponding to the second side of the heat exchange plate 11, and a second groove 1125 is formed between two adjacent convex structures 1124. Among all the convex parts 133, some of the convex parts 133 correspond to the second grooves 1125 one by one and abut against the corresponding second grooves 1125. By abutting some of the convex parts 133 against the second grooves 1125, the supporting area of ​​the support plate 13 for the heat exchange plate 11 is increased, so that the weight of the heat exchange plate 11 can be more evenly transferred to the support plate 13. Moreover, since the abutting position of some of the convex parts 133 is located between adjacent first refrigerant flow channels, avoiding the first refrigerant flow channel, because it will not cause wear to the flow channel, avoiding the risk of leakage due to damage.

[0093] Exemplary, combined Figure 4 and Figure 8As shown, the multiple protrusions 133 also 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 the third direction, and the second protrusions 1332 on different reinforcing ribs 132 are aligned in the second direction, and an avoidance groove 134 is provided between two adjacent second protrusions 1332.

[0094] It should be noted that an avoidance groove 134 is formed between two adjacent protrusions 133, and the two protrusions 133 may be the same or different. For example: two adjacent protrusions 133 are both second protrusions 1332, that is, an avoidance groove 134 is formed between two adjacent second protrusions 1332; for another example: two adjacent protrusions 133 are respectively first protrusions 1331 and second protrusions 1332, that is, an avoidance groove 134 is formed between the adjacent first protrusions 1331 and second protrusions 1332; for another example: two adjacent protrusions 133 are respectively second protrusions 1332 and third protrusions 1333, that is, an avoidance groove 134 is formed between the adjacent second protrusions 1332 and third protrusions 1333. Therefore, as long as the avoidance groove 134 is formed between two adjacent protrusions 133, it is within the protection scope of the present invention without violating the principles and inventive concepts of the present invention.

[0095] like Figure 4 As shown, each second protrusion 1332 corresponds to a second groove 1125, and each second protrusion 1332 abuts against the corresponding second groove 1125. By abutting the second protrusion 1332 against the second groove 1125, the support area of ​​the support plate 13 on the heat exchange plate 11 is increased, so that the weight of the heat exchange plate 11 can be more evenly transferred to the support plate 13. Moreover, since the abutting position of the second protrusion 1332 is located between adjacent first refrigerant flow channels, avoiding the first refrigerant flow channels, since no wear will be caused to the flow channels, the risk of leakage due to damage is avoided.

[0096] It is understandable that if Figure 8 As shown, in the second direction, the protrusions 133 on different reinforcing ribs 132 are aligned with each other. Since all the protrusions 133 correspond to each other, the avoidance grooves 134 are also aligned, and the protrusion structure 1124 corresponding to each first refrigerant flow channel can be inserted into a plurality of corresponding avoidance grooves 134 to avoid wear.

[0097] It should be noted that, in this embodiment, Fig. 9 As shown, the first refrigerant flow channel and the protruding structure 1124 both extend in a straight line along the second direction. Therefore, in this embodiment, the protruding portions 133 on different reinforcing ribs 132 are aligned with each other. Figure 8As shown, a straight line distribution is formed between the corresponding protrusions 133 in the second direction, so that the corresponding avoidance grooves 134 in the second direction are also distributed in a straight line, so that they can be interconnected in the second direction to accommodate the protrusion structure 1124 extending in a straight line. However, this is not restrictive. If the protrusion structure 1124 is distributed in a curve or a broken line, the distribution of the protrusions 133 in the second direction is also adapted to the protrusion structure 1124, so that the avoidance groove 134 can accommodate the protrusion structure 1124.

[0098] A buffer groove 1126 is also provided on the flow channel plate 112. After the flow channel plate 112 and the heat conducting plate 111 are buckled and welded, the buffer groove 1126 and the buckling surface 1112 form a closed cavity to buffer the deformation of the flow channel plate 112 caused by the heat during welding. At the same time, it is used to accommodate the air discharged from the flow channel plate 112 and the heat conducting plate 111 during welding to prevent the air from forming bubbles between the connection interface of the heat conducting plate 111 and the flow channel plate 112, causing deformation of the heat exchange plate 11.

[0099] like Figure 2 As shown, 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. 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, thereby improving the connection strength, so that the heat exchange plate 11, the frame 12 and the support plate 13 form a whole, and the bearing capacity of the lower box 10 is improved.

[0100] like Figure 8 As shown, the plate body 131 of the support plate 13 has two opposite ends in the third direction, and the two ends of the plate body 131 of the support plate 13 are respectively formed with a first folding edge 1311, as shown in FIG. Figure 4 As shown, both ends of the plate body 131 are first bent toward the side of the plate body 131 away from the heat exchange plate 11 , and then bent toward the outside in a third direction to form a first folded edge 1311 , and the support plate 13 is connected to the first side of the frame 12 via the first folded edge 1311 .

[0101] Among all the protrusions 133, some of the protrusions 133 are arranged at intervals along the third direction, the first and the last of the protrusions 133 arranged at intervals along the third direction are respectively located at two ends of the support plate 13 and are adjacent to the corresponding first folded edges 1311, and the first and the last of the protrusions 133 arranged at intervals along the third direction are connected to the first side of the frame 12.

[0102] For example, Figure 8As shown, the plurality of protrusions 133 further include: a third protrusion 1333. The first and the last of the protrusions 133 arranged at intervals along the third direction are respectively the third protrusions 1333. That is, the third protrusions 1333 are at least one pair, and the same pair of third protrusions 1333 are respectively arranged 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.

[0103] like Figure 8 As shown, each reinforcing rib 132 is provided with two third protrusions 1333, and the two third protrusions 1333 are respectively located at two ends of the same reinforcing rib 132. Figure 4 As shown, the first folded edge 1311 and the third protrusion 1333 are respectively connected to the first side of the frame 12. By connecting the first folded edge 1311 and the third protrusion 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.

[0104] like Figure 6 As shown, 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 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 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; the connecting plate 123 is arranged along the third direction, and the two ends of the connecting plate 123 are respectively connected to the second ends of the two first side beams 121, and the first side beam 121, the second side beam 122 and the connecting plate 123 form a frame-like structure; the first folded edge 1311 at the same end of the support plate 13 and the protrusion 133 adjacent to the first folded edge 1311 are both connected to the same first side beam 121. In other words, Figure 4 As shown, the first folded edge 1311 and the third protrusion 1333 at the same end are respectively connected to the same first side beam 121.

[0105] like Figure 6 As shown, the first side beam 121 includes: a first beam body 1211 and a first convex eave 1212. The first beam body 1211 extends along the second direction and is combined with Figure 4 and Figure 7 As shown, the first beam body 1211 has a first connecting surface 1211a and a second connecting surface 1211b arranged opposite to 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; Figure 6 As shown, the first convex eave 1212 is arranged along the second direction and is 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 FIG. Figure 7As shown, the first convex 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; Figure 4 As shown, the first folded edge 1311 is connected to the first connection surface 1211a, the protrusion 133 adjacent to the first folded edge 1311 is connected to the third connection surface 1212a, and the heat exchange plate 11 is connected to the second connection surface 1211b and the fourth connection surface 1212b at the same time. Figure 4 As shown, the third protrusion 1333 is connected to the third connection surface 1212a, and the heat exchange plate 11 is connected to the second connection surface 1211b and the fourth connection surface 1212b at the same time. By adding the first convex eaves 1212 on the inner side of the first beam body 1211, the connection area of ​​the first side beam 121 is increased, so that the support plate 13 can not only be welded to the first connection surface 1211a of the first side beam 121 through the first folding edge 1311, but also can be welded to the third connection surface 1212a of the first convex eaves 1212 through the third protrusion 1333, thereby improving the connection strength. In addition, since the heat exchange plate 11 is also connected to the other side of the first convex eaves 1212, the support of the heat exchange plate 11 can also be achieved. At the same time, from another perspective, the third protrusion 1333 of the support plate 13 and the heat exchange plate 11 can clamp and fix the first convex eaves 1212, thereby improving the overall connection strength, thereby improving the bearing capacity of the lower box body 10.

[0106] like Figure 4 As shown, the first connection surface 1211a is provided with a mounting groove 1213, and the first folded edge 1311 is located in the mounting groove 1213. By providing the mounting groove 1213 on the first connection surface 1211a, when the support plate 13 is installed, the first folded edge 1311 can be matched with the mounting groove 1213 to achieve positioning. At the same time, after the first folded edge 1311 is welded to the mounting groove 1213, the mounting groove 1213 limits the first folded edge 1311 to improve the reliability of the connection. At the same time, since the first folded edge 1311 is located in 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, so that after the battery pack is placed on the battery holder, the first folded edge 1311 and the first connecting surface 1211a are jointly supported on the supporting surface of the battery holder, so that the force is more uniform and stress concentration is avoided.

[0107] It should be noted that, in this embodiment, the cross section of the first beam body 1211 is a rectangular structure, and is formed by roll forming of high-strength steel, so the strength is relatively high. Figure 6As shown, a hoisting hole 1214 for hoisting 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 hoisting.

[0108] like Figure 4 As shown, the heat exchange plate 11 further includes: a second folded edge 113, the second folded edge 113 is connected to the two side edges of the heat conducting plate 111 in the third direction, as shown in FIG. Figure 4 As shown, the second folded edge 113 is first bent in the first direction away from the support plate 13, and then bent in the third direction toward the outer side of the heat conducting plate 111, and the second folded edge 113 is riveted to the second connecting surface 1211b. The flow channel plate 112 is buckled with the buckling surface 1112 of the heat conducting plate 111, and the two side edges of the flow channel plate 112 in the third direction are respectively connected to the heat conducting plate 111 and the fourth connecting surface 1212b. By arranging the second folded edge 113 on both sides of the heat conducting plate 111 and riveting the second folded edge 113 with the second connecting surface 1211b, the heat exchange plate 11 is fixedly connected to the first side beam 121. At the same time, the edges of the flow channel plate 112 are respectively connected to the heat conducting plate 111 and the fourth connecting surface 1212b, which is equivalent to supporting the heat exchange plate 11 through the first convex eaves 1212, and then cooperating with the third protrusion 1333, thereby improving the bearing capacity of the heat exchange plate 11.

[0109] Illustratively, since the first side beam 121 and the heat exchange plate 11 are made of different materials, the first convex eave 1212 and the heat exchange plate 11 are fixedly connected by bonding to improve the overall strength of the lower box body 10 .

[0110] It can be understood that the second side beam 122 includes: a second beam body 1221 and a second convex eave 1222, and the second beam body 1221 and the second convex eave 1222 are both arranged along the third direction. The second convex eave 1222 is arranged on the side of the second beam body 1221 facing the connecting plate 123. Correspondingly, the heat exchange plate 11 is also provided with a third folding edge 114, which is first bent in the first direction away from the support plate 13, and then bent toward the outer side of the heat transfer plate 111 along the second direction. The third folding edge 114 corresponds to the second side beam 122 and is riveted to the second beam body 1221, and the side edge of the flow channel plate 112 corresponding to the second side beam 122 is connected to the second convex eave 1222. The second convex eave 1222 is arranged on the second beam body 1221, and the second convex eave 1222 can form support along the third direction, thereby further improving the bearing capacity of the heat exchange plate 11.

[0111] like Figure 2 and Fig.10As shown, 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, the second end of the heat conducting plate 111 is used to connect with the second side beam 122, and the third folded edge 114 is located at the second end of the heat conducting plate 111.

[0112] The second folded edge 113 extends from the first end to the second end of the heat conducting plate 111 . At the first end of the heat conducting plate 111 , a transition structure 115 is formed at the connection position between the second folded edge 113 and the heat conducting plate 111 . At the second end of the heat conducting plate 111 , the second folded edge 113 is connected to the third folded edge 114 .

[0113] like Fig.11 As shown, 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 fit and abut against the upper cover 30. The second abutting surface 1152 is connected to the snap-fit ​​surface 1112. The connecting plate 123 is provided with a supporting boss 1231 corresponding to the transition plate. The supporting boss 1231 fits and abuts against the second abutting surface 1152 of the transition plate. By providing the transition structure 115 and by having the first abutting surface 1151 and the second abutting surface 1152 of the transition structure 115 fit and abut against the upper cover 30 and the supporting boss 1231 respectively, the generation of a longitudinal gap can be prevented, thereby improving the reliability of the connection.

[0114] like Fig.11 As shown, for example, the transition structure 115 is a transition plate, and two side surfaces of the transition plate in the first direction are a first abutting surface 1151 and a second abutting surface 1152. Fig.12 As shown, the first abutting surface 1151 and the heat exchange surface 1111 are connected to form an angle A, and the value range of the angle A is 90°<A<180°. For example, the angle A can be 91°, 95°, 100°, 120°, 135°, 150°, 170°, 179°, etc. Since the direction of the pressing force is along the first direction when the upper cover 30 is buckled, the downward pressure separation can be formed on the first abutting surface 1151 by providing the inclined transition structure 115, thereby improving the reliability of the connection and the overall sealing.

[0115] In this embodiment, the connecting plate 123 is provided with supporting bosses 1231 at both ends in the third direction, and the surface of the supporting bosses 1231 is an inclined surface matching the second abutting surface 1152. When the heat exchange plate 11 is assembled on the frame 12, the inclined surface of the supporting bosses 1231 on the connecting plate 123 is attached to and abuts against the second abutting surface 1152. When the heat exchange plate 11 and the connecting plate 123 are riveted, the supporting bosses 1231 can play a role in 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.

[0116] like Figure 1 As shown, 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, and an inclined section 3211 matching the transition plate is formed on the first pressing edge 321, and the inclined section 3211 of the first pressing edge 321 is pressed onto the first abutting surface 1151 of the transition plate.

[0117] Specifically, if Figure 1 As shown, the upper cover 30 includes: a cover body 31 and a pressure edge 32 arranged on the outer periphery of the cover body 31. The cover body 31 has a first end and a second end in the 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 pressure edge 32 includes a first pressure edge 321, a second pressure edge 322 and a third pressure edge 323. The first pressure edge 321 is arranged along the 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 with the heat conducting plate 111, the flow channel plate 112 and the connecting plate 123 of the heat exchange plate 11. The second pressure edge 322 is arranged along the 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 with the third folding edge 114 and the second side beam 122. There are two third pressing edges 323 , both of which are arranged along the second direction and connected between the first pressing edge 321 and the second pressing edge 322 , and are used to connect the second folding edge 113 and the first side beam 121 .

[0118] like Figure 1 As shown, 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 buckled onto the lower box body 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 conduction plate 111 between the two transition plates.

[0119] like Fig.10As shown, 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 in sequence; and the horizontal section 3212 of the first pressing edge 321 (see Figure 1 ), the heat conducting plate 111 between the two transition plates, the pressing boss 1233 of the connecting plate 123 (see Fig.10 ) are pressed in sequence.

[0120] It should be noted that the transition plate and the support boss 1231 are riveted together by rivet nuts, and the inclined section 3211 of the first pressure edge 321 is fixedly connected to the transition plate by bolts. The bolts penetrate the inclined section 3211 and are screwed with the rivet nuts on the transition plate to achieve a fixed connection, so that the inclined section 3211 of the first pressure edge 321 is in close contact with the transition plate, thereby improving the sealing performance.

[0121] Similarly, the heat conducting plate 111 area between the two transition plates and the pressing boss 1233 are also riveted together by rivet nuts, and the horizontal section 3212 of the first pressing edge 321 is also fixedly connected to the heat conducting plate 111 by bolts. The bolts penetrate the horizontal section 3212 and are screwed with 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.

[0122] like Figure 1 As shown, the battery pack also includes: a limit block 41, which is arranged on the outer peripheral side of the frame 12 and is used to cooperate with the battery pack bracket to limit the displacement of the battery pack in the second direction and / or the third direction, so that the battery pack is limited on the battery bracket to prevent the battery pack from vibrating too much. It can be understood that there is a gap between the outer peripheral side of the frame 12 and the battery pack bracket. Therefore, under the action of external force, the frame 12 is easy to move relative to the battery pack bracket, causing collision or wear. By arranging the limit block 41 on the outer peripheral side of the frame 12, the limit block 41 can be pressed against the battery pack bracket and limited to cooperate, thereby reducing the vibration amplitude of the battery pack.

[0123] The installation position of the limit block 41 can be determined according to the gap position 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, the limit 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, the limit block 41 can be set on both sides of the frame 12 in the second direction. If there is a gap between the frame 12 and the battery pack bracket in both the second and third directions, the limit 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.

[0124] like Figure 1 As shown, the battery pack further includes: a sealing ring 50, which is disposed between the upper cover 30 and the lower box body 10 to achieve a sealing fit between the upper cover 30 and the lower box body 10. Specifically, the sealing ring 50 is disposed between the edge clamp 32 and the heat exchange plate 11, and the bolts penetrate the edge clamp 32, the sealing ring 50, the heat exchange plate 11 and the frame 12 at the same time, and are locked by nuts, so that the edge clamp 32 presses the sealing ring 50 on the heat exchange plate 11, thereby achieving sealing of the joint gap and improving the sealing effect.

[0125] The battery pack also includes: an electrical installation panel 60, a total positive socket 71, a total negative socket 72 and a copper busbar 80. The electrical installation panel 60 is arranged at the first end of the cover body 31, and the copper busbar 80 includes: a positive copper busbar and a negative copper busbar, the positive copper busbar is electrically connected to the positive electrode of each battery module in the module unit 20, and the negative copper busbar is electrically connected to the negative electrode of each battery module in the module unit 20. The total positive socket 71 and the total socket are arranged on the installation panel for electrical connection with the external circuit. Inside the battery pack, the conductive core of the total positive socket 71 is electrically connected to the positive copper busbar, and the conductive core of the total negative socket 72 is electrically connected to the negative copper busbar.

[0126] The battery pack further includes: an insulating sheet 91 and a steel belt 92, the steel belt 92 being wrapped around the outer circumference of each battery module in the module unit 20 to fix the batteries in the battery module as a whole. Figure 1 As shown, the module unit 20 has a first end and a second end in the second direction, the first end of the module unit 20 corresponds to the first end of the cover body 31 of the upper cover 30, and the copper bar 80 is arranged at the first end of the module unit 20. In order to avoid the copper bar 80 from contacting and short-circuiting with the steel strip 92 on the outer peripheral side of the module unit 20, the insulating sheet 91 is arranged between the steel strip 92 of the module unit 20 and the copper bar 80, so as to improve the reliability of the battery pack.

[0127] like Figure 1 As shown, the battery pack further includes: a front module beam 42 and a rear module beam 43. The front module beam 42 is arranged at the first end of the heat exchange plate 11 along the third direction, and the rear module beam 43 is arranged at the second end of the heat exchange plate 11 along the 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, so as to achieve a fixed connection with the heat exchange plate 11.

[0128] like Fig.10 As shown, a plurality of connecting bosses 1232 are also provided on the connecting plate 123. The connecting bosses 1232 are spaced apart along the third direction. All the connecting bosses 1232 correspond to the front module beam 42. Connecting holes are provided on the connecting bosses 1232. The connecting bosses 1232 are used to connect to 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.

[0129] 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 conducting plate 111 and the lower end surface of the front module beam 42 of the heat exchange plate 11 from bottom to top, and the bolts are also inserted into the connecting holes of the connecting bosses 1232 from bottom to top and are threadedly connected to the rivet nuts, so that the connecting plate 123 is fixedly connected to the heat exchange plate 11 and the front module beam 42.

[0130] The rear module beam 43 is arranged at a position corresponding to the second convex eave 1222 . The second convex eave 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 .

[0131] Exemplarily, the rivet nuts are used to fix the second flange 1222, the heat exchange plate 11, and the rear module beam 43 in sequence from bottom to top.

[0132] According to another aspect of the present invention, an energy storage system is provided, comprising the above-mentioned battery pack.

[0133] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A battery pack, comprising: A lower box (10), a module unit (20) and an upper cover (30), wherein the upper cover (30) is buckled on the lower box (10) and surrounds a receiving cavity, and the module unit (20) is connected to the lower box (10) and is located in the receiving cavity, characterized in that the lower box (10) comprises: A heat exchange plate (11), having a first side and a second side arranged opposite to each other in a first direction, wherein 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) 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), wherein the support plate (13) is fixedly connected to the heat exchange plate (11); Wherein, 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).

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) and the heat exchange plate (11) are made of different materials.

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) and the frame (12) are riveted; and the frame (12) and the support plate (13) are welded.

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 the thermal conductivity of the material used for the support plate (13).

7. The battery pack according to claim 1, characterized in that: A connecting piece (14) is provided on the support plate (13), the connecting piece (14) is connected to the heat exchange plate (11), and the support plate (13) is fixedly connected to the heat exchange plate (11) via the connecting piece (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) abutting against the second side of the heat exchange plate (11), and the connecting member (14) is passed through at least part of the protrusions (133) so that at least part 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 second side of the heat exchange plate (11) has a plurality of connecting protrusions (1113), and among all the protrusions (133), some of the protrusions (133) correspond one-to-one with and abut against the connecting protrusions (1113), and the protrusions (133) and the connecting protrusions (1113) abutting against each other are fixedly connected via the connecting piece (14).

10. The battery pack according to claim 9, characterized in that: The protrusions (133) are 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), and 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 a plurality of support plates (13), each of which is arranged along the third direction, and all of which are spaced apart along the second direction. Each of the support plates (13) has at least one protrusion (133) abutting against the connecting protrusion (1113).

12. The battery pack according to claim 9, characterized in that: The heat exchange plate (11) comprises: A heat conducting plate (111), the heat exchange surface (1111) being located on the heat conducting plate (111), and the connecting protrusion (1113) being located on a side of the heat conducting plate (111) facing away from the heat exchange surface (1111); The flow channel plate (112) is buckled with a side of the heat conducting plate (111) facing away from the heat exchange surface (1111), and a avoidance opening (1121) corresponding to the connecting protrusion (1113) is provided on the flow channel plate (112), and the connecting protrusion (1113) is inserted into the avoidance 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: A reinforcing rib (132) is provided along a third direction on one side of the support plate (13) facing the heat exchange plate (11); In the third direction, a plurality of the protrusions (133) are spaced apart and distributed on the reinforcing rib (132), and avoidance grooves (134) penetrating in the second direction are formed between adjacent protrusions (133), and 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, and the outer wall of the first refrigerant flow channel forms a protruding structure (1124) on the second side of the heat exchange plate (11), and the protruding structure (1124) is penetrated in the avoidance groove (134), and the protruding structure (1124) is gap-matched with the inner wall of the avoidance groove (134).

15. The battery pack according to claim 14, characterized in that: There are a plurality of first refrigerant flow channels, and the plurality of first refrigerant flow channels are spaced apart in the third direction; the outer wall of each first refrigerant flow channel forms a corresponding 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); Among all the protrusions (133), some of the protrusions (133) correspond to the second grooves (1125) one by one and abut against the corresponding second grooves (1125).

16. The battery pack according to claim 14, characterized in that: There are a plurality of reinforcing ribs (132), and the plurality of reinforcing ribs (132) are distributed at intervals along the second direction, and each of the reinforcing ribs (132) is provided with a plurality of protrusions (133).

17. The battery pack according to claim 8, characterized in that: 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), 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 with the first direction, the support plate (13) has two oppositely arranged ends, the two ends of the support plate (13) are respectively formed with first folded edges (1311), and the support plate (13) is connected to the first side of the frame (12) via the first folded edges (1311); Among all the protrusions (133), some of the protrusions (133) are arranged at intervals along the third direction, the first and the last of the protrusions (133) arranged at intervals along the third direction are respectively located at two ends of the support plate (13) and are arranged adjacent to the corresponding first folded edges (1311), and the first and the last of the protrusions (133) arranged at intervals 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) comprises: A 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), the two first side beams (121) are arranged at intervals in the third direction, and the first direction, the second direction and the third direction intersect each other; A second side beam (122) is arranged along the third direction, and 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) arranged along the third direction, wherein two ends of the connecting plate (123) are respectively connected to the second ends of the two first side beams (121), and the first side beams (121), the second side beams (122) and the connecting plate (123) form a frame-shaped structure; The first folded edge (1311) at the same end of the support plate (13) and the protruding portion (133) adjacent to the first folded edge (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) comprises: a first beam body (1211) extending along the second direction, the first beam body (1211) having a first connecting surface (1211a) and a second connecting surface (1211b) arranged opposite to each other in the first direction, the first connecting surface (1211a) being located on a first side of the frame (12), and the second connecting surface (1211b) being located on a second side of the frame (12); a first convex eave (1212), arranged along the second direction and located on a side of the first beam body (1211) facing the other first side beam (121), the first convex eave (1212) having 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) being located on a first side of the frame (12), and the fourth connecting surface (1212b) being located on a second side of the frame (12); The first folded edge (1311) is connected to the first connecting surface (1211a), the raised portion (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) comprises: A heat conducting plate (111) having a first side and a second side arranged opposite to each other in a first direction, the heat exchange surface (1111) being located on the first side of the heat conducting plate (111), and the second side of the heat conducting plate (111) having a buckling surface (1112); A flow channel plate (112) is buckled with the buckling surface (1112) of the heat conducting plate (111), and the edge of the flow channel plate (112) is respectively connected to the heat conducting plate (111) and the fourth connecting surface (1212b); The second folded edge (113) is connected to the edges on both sides of the heat conducting plate (111) in the third direction, and the second folded edge (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 be connected to a connecting plate (123); At the first end of the heat conducting plate (111), a transition structure (115) is formed at a position where the second folded edge (113) is connected to 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) and is used to fit and abut against the upper cover (30); and the second abutting surface (1152) is connected to the buckling surface (1112); The connecting plate (123) is provided with a supporting boss (1231) corresponding to the transition structure (115), and the supporting boss (1231) is in contact with and abuts against the second abutting surface (1152).

24. The battery pack according to claim 23, characterized in that: An angle A is formed at the position where the first abutting surface (1151) is connected to the heat exchange surface (1111), and the value range of the angle A is 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), and 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 further comprises: A limit block (41) is arranged on the outer peripheral side of the frame (12) and is used to cooperate with the battery pack bracket to limit the displacement of the battery pack in the second direction and / or the third direction, and 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 further comprises: A sealing ring (50) is arranged between the upper cover (30) and the lower box body (10) to ensure a sealing fit between the upper cover (30) and the lower box body (10).

28. The battery pack according to claim 1, characterized in that: The battery pack further comprises: An insulating sheet (91) is arranged 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 contacting and short-circuiting.

29. An energy storage system, characterized in that: A battery pack comprising the battery pack described in any one of claims 1 to 28.

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