Lower box body and battery pack

Abstract

The utility model provides a lower box body and battery pack, the lower box body includes: a heat exchange plate having a first side and a second side in a first direction, the first side of the heat exchange plate being used for bearing a battery module and exchanging heat with the battery module; the first frame is arranged on the first side of the heat exchange plate; the first frame is arranged on the first side of the heat exchange plate, the second frame is arranged on the second side of the heat exchange plate and corresponds to the first frame, a clamping space is formed between the first frame and the second frame, the outer periphery of the heat exchange plate is located in the clamping space, and the heat exchange plate is clamped and fixed through the first frame and the second frame. According to the lower box body, due to the existence of the second frame, the height of the first frame can be reduced, so that the overall height of the lower box body is reduced, meanwhile, a double-layer frame structure is formed by the first frame and the second frame, and the overall rigidity and strength of the lower box body are improved through a plurality of closed cavities.

Description

Technical Field

[0001] This utility model relates to the field of energy storage, specifically to a lower housing and a battery pack. Background Technology

[0002] The battery pack is an important component of new energy vehicles and energy storage. The lower housing is an important part of the battery pack, mainly used to support and cool the battery modules.

[0003] 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 increasingly larger battery capacity has led to a further increase in the size and weight of the battery itself. Therefore, the requirements for the load-bearing capacity of the lower casing are also becoming higher and higher.

[0004] Traditionally, the lower casing accounts for about 20% of the battery system's weight. The industry tries to reduce the height of the lower casing as much as possible and increase the height of the upper casing. The advantage is that it can reduce the overall weight and cost of the battery pack, reduce assembly difficulty, and increase manufacturability. However, it will lead to a decrease in the rigidity and strength of the lower casing, creating safety hazards. Utility Model Content

[0005] This invention aims to at least solve the problem that the reduced height ratio of the lower housing in the prior art leads to a decrease in the rigidity and strength of the lower housing, and proposes a lower housing and battery pack.

[0006] To achieve the purpose of this utility model, a lower housing is provided, comprising: a heat exchange plate having a first side and a second side in a first direction, the first side of the heat exchange plate being used to support a battery module and exchange heat with the battery module; a first frame disposed on the first side of the heat exchange plate; and a second frame disposed on the second side of the heat exchange plate and corresponding to the first frame, a clamping space being formed between the first frame and the second frame, the outer periphery of the heat exchange plate being located within the clamping space, and the first frame and the second frame clamping and fixing the heat exchange plate.

[0007] Optionally, the lower housing further includes: a plurality of connectors, spaced apart along the outer periphery of the heat exchange plate; each connector is sequentially inserted through the first frame and the heat exchange plate and connected to the second frame, so that the first frame and the second frame clamp and fix the heat exchange plate.

[0008] Optionally, the first frame has a first clamping surface facing the heat exchange plate, the first clamping surface clamping the surface of the heat exchange plate on a first side; the second frame has a second clamping surface facing the heat exchange plate, the second clamping surface clamping the surface of the heat exchange plate on a second side, the first clamping surface and the second clamping surface corresponding to each other and forming the clamping space.

[0009] Optionally, the first frame includes: two first side beams, both arranged along a second direction, the two first side beams being spaced apart in a third direction; two second side beams, both arranged along the third direction, the two second side beams being spaced apart in the second direction and respectively connected between the two first side beams, the first side beams and the second side beams forming a frame structure; and a connecting beam, arranged along the third direction and located between the two second side beams, the two ends of the connecting beam being respectively connected to the two first side beams, the first direction, the second direction and the third direction intersecting each other.

[0010] Optionally, in the first direction, the first side beam has a first abutting surface that abuts against the first side of the heat exchange plate, and the second side beam has a second abutting surface that abuts against the first side of the heat exchange plate, wherein the first abutting surface and the second abutting surface together form the first clamping surface.

[0011] Optionally, the second frame includes: a third side beam, arranged along a second direction and having a first end and a second end, wherein there are two third side beams, which are spaced apart in a third direction; a fourth side beam, arranged along the third direction, with both ends of the fourth side beam connected to the first ends of the two third side beams respectively; a connecting plate, arranged along the third direction, with both ends of the connecting plate connected to the second ends of the two third side beams respectively, wherein the third side beams, the fourth side beams, and the connecting plate form a frame structure; and a reinforcing plate, arranged along the third direction and located between the fourth side beam and the connecting plate, with both ends of the reinforcing plate connected to the two third side beams respectively, wherein the first direction, the second direction, and the third direction intersect each other.

[0012] Optionally, in the first direction, the third side beam has a third abutting surface abutting against the second side of the heat exchange plate, the fourth side beam has a fourth abutting surface abutting against the second side of the heat exchange plate, and the connecting plate has a fifth abutting surface abutting against the second side of the heat exchange plate. The third abutting surface, the fourth abutting surface, and the fifth abutting surface together form the second clamping surface.

[0013] Optionally, the third side beam includes: a beam body extending along the second direction, the beam body having a first side facing the second side of the heat exchange plate in the first direction, the beam body having a second side facing another third side beam in the third direction, the first side being connected to the second side; and an eaves disposed on the second side of the beam body along the second direction, the eaves having a third side facing the second side of the heat exchange plate in the first direction, the third side being connected to the first side to form the third abutment surface.

[0014] Optionally, the eaves has a fourth side facing away from the second side of the heat exchange plate in the first direction, the fourth side is connected to the second side and forms a mounting groove, and the end of the reinforcing plate is located in the mounting groove and connected to the eaves.

[0015] Optionally, a first rib is provided on the connecting plate along the third direction, the first rib protruding toward the second side of the heat exchange plate, and the top surface of the first rib forms the fifth abutment surface.

[0016] Optionally, the reinforcing plate has a first protrusion facing the second side of the heat exchange plate, and the second side of the heat exchange plate has a connecting protrusion corresponding to the first protrusion, the first protrusion being riveted to the connecting protrusion.

[0017] Optionally, the connecting beam has a connecting portion for connecting with the battery module; the reinforcing plate has a second protrusion facing the second side of the heat exchange plate, the second protrusion corresponding to the position of the connecting beam, the second protrusion abutting against the second side of the heat exchange plate, and the connecting beam, the heat exchange plate and the second protrusion are connected in sequence.

[0018] According to a second aspect of the present invention, a battery pack is also disclosed, comprising: the aforementioned lower housing.

[0019] The lower housing of this invention can reduce the height of the first frame due to the presence of the second frame, thereby reducing the overall height of the lower housing. At the same time, the double-layer frame structure formed by the first and second frames, through multiple closed cavities, improves the overall rigidity and strength of the lower housing. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the lower housing of an embodiment of the present utility model;

[0021] Figure 2 This is a side view of the lower housing of an embodiment of the present utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the first frame of the lower box body according to an embodiment of the present utility model;

[0023] Figure 4 This is an exploded view of the lower housing of an embodiment of the present utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the second frame of the lower housing in an embodiment of the present utility model;

[0025] Figure 6 This is a schematic diagram of the structure of the third side beam of the lower box body according to an embodiment of the present invention;

[0026] Figure 7 for Figure 4 A magnified view of part A in the middle;

[0027] Figure 8 for Figure 1 A magnified view of part B in the middle section;

[0028] List of reference numerals in the attached diagram:

[0029] 10. Heat exchange plate; 11. Second through hole; 12. Heat conducting plate; 121. Connecting protrusion; 13. Flow channel plate; 131. Clearance opening; 20. First frame; 21. First through hole; 22. First clamping surface; 23. First side beam; 231. First abutment surface; 24. Second side beam; 241. Second abutment surface; 25. Connecting beam; 251. Connecting part; 26. Reinforcing beam; 30. Second frame; 31. Third through hole; 32. Third side beam; 321 3211. Beam body; 3212. First side; 3212. Second side; 322. Eaves; 3221. Third side; 3222. Fourth side; 323. Mounting groove; 324. Third abutment surface; 33. Fourth side beam; 331. Fourth abutment surface; 34. Connecting plate; 341. Fifth abutment surface; 342. First rib; 343. Connecting boss; 35. Reinforcing plate; 351. First protrusion; 352. Second protrusion; 36. Second clamping surface. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solution of this utility model, the lower housing and battery pack provided by this utility model will be described in detail below with reference to the accompanying drawings.

[0031] The battery pack is an important component of new energy vehicles and energy storage. The lower housing is an important part of the battery pack, mainly used to support and cool the battery modules.

[0032] 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 increasingly larger battery capacity has led to a further increase in the size and weight of the battery itself. Therefore, the requirements for the load-bearing capacity of the lower casing are also becoming higher and higher.

[0033] Traditionally, the lower casing accounts for about 20% of the battery system's weight. The industry tries to reduce the height of the lower casing as much as possible and increase the height of the upper cover. The advantage is that it can reduce the overall weight and cost of the battery pack, reduce assembly difficulty, and improve manufacturability.

[0034] In some related technologies, the lower enclosure includes a cold-rolled steel plate, a frame, and a bottom protective plate. The outer perimeter of the cold-rolled steel plate is connected to the frame, and the bottom protective plate is attached to the bottom of the cold-rolled steel plate to protect it. However, to reduce the height of the lower enclosure, the frame thickness must be reduced, which leads to a decrease in the frame's rigidity and strength, thus affecting the overall rigidity and strength of the lower enclosure. Although a bottom protective plate is provided at the bottom of the cold-rolled steel plate, its primary function is bottom protection, and its effect on strengthening rigidity and strength is relatively poor. Therefore, it still contributes to a decrease in the rigidity and strength performance of the lower enclosure, creating safety hazards.

[0035] To address the aforementioned problems, this utility model discloses a lower housing for a battery pack. For example... Figure 1 As shown, the thickness direction of the lower box is the first direction, which is the x-axis direction; the length direction of the lower box is the second direction, which is the y-axis direction; and the width direction of the lower box is the third direction, which is the z-axis direction. The first, second, and third directions are all perpendicular to each other.

[0036] The lower housing includes a heat exchange plate 10, a first frame 20, and a second frame 30. The heat exchange plate 10 has a first side and a second side in a first direction. The first side of the heat exchange plate 10 is used to support the battery module and exchange heat with the battery module. The first frame 20 is disposed on the first side of the heat exchange plate 10. The second frame 30 is disposed on the second side of the heat exchange plate 10 and corresponds to the first frame 20. A clamping space is formed between the first frame 20 and the second frame 30. The outer periphery of the heat exchange plate 10 is located within the clamping space. The first frame 20 and the second frame 30 clamp and fix the heat exchange plate 10.

[0037] During assembly, the heat exchange plate 10 is placed between the first frame 20 and the second frame 30. The edges of the heat exchange plate 10 are clamped and fixed by the first frame 20 and the second frame 30, making the heat exchange plate 10 less prone to deformation. Compared with the prior art, due to the presence of the second frame 30, the height of the first frame 20 of the lower housing of this utility model can be made lower. At the same time, the first frame 20 and the second frame 30 form a double-layer frame structure, and both the first frame 20 and the second frame 30 have closed cavity structures. Therefore, through multiple closed cavities, the overall rigidity and strength of the lower housing are improved, and the second frame 30 can support the heat exchange plate 10, reducing the stress on the heat exchange plate 10.

[0038] In the prior art, since a bottom guard plate is also required at the bottom of the heat exchange plate 10, the second frame 30 can replace the bottom guard plate. This not only protects the heat exchange plate 10 but also increases the strength and rigidity of the lower housing. Moreover, since the second frame 30 replaces the bottom guard plate, the thickness is not increased. This is equivalent to increasing the strength and rigidity of the lower housing without increasing its size.

[0039] Since both the first frame 20 and the second frame 30 have closed cavities, the stiffness and strength are greatly increased through multiple closed cavities, which can reduce the amount of material used in each frame, thereby reducing weight and cost while meeting strength requirements.

[0040] It should be noted that the lower housing also includes multiple connectors. The multiple connectors are distributed at intervals along the outer periphery of the heat exchange plate 10; each connector is sequentially inserted through the first frame 20 and the heat exchange plate 10 and connected to the second frame 30, so that the first frame 20 and the second frame 30 clamp and fix the heat exchange plate 10.

[0041] For example, the connecting component is a bolt. A first through hole 21 is provided on the first frame 20, a second through hole 11 corresponding to the first through hole 21 is provided on the outer periphery of the heat exchange plate 10, and a third through hole 31 corresponding to the second through hole 11 is provided on the second frame 30. The third through hole 31 has an internal thread. The bolt is sequentially inserted into the first through hole 21 and the second through hole 11, and engages with the internal thread of the third through hole 31, thereby achieving a threaded connection. By rotating the bolt, the first frame 20 and the second frame 30 can be moved closer or further apart. When the first frame 20 and the second frame 30 are closer together, the clamping force of the first frame 20 and the second frame 30 on the heat exchange plate 10 can be increased, thus making the connection between the first frame 20, the second frame 30, and the heat exchange plate 10 tighter and improving the overall rigidity and strength of the lower housing.

[0042] It is understandable that by setting multiple bolts, and by setting the first through hole 21, the second through hole 11 and the third through hole 31 to correspond one-to-one with the bolts, that is, by distributing the bolts circumferentially on the lower housing, the first frame 20, the second frame 30 and the heat exchange plate 10 can be subjected to more uniform force, thereby improving the overall rigidity and strength.

[0043] It should be noted that in this embodiment, the third through hole 31 is provided with internal threads, and the bolt is threaded into the third through hole 31. However, this is not limiting. In some other embodiments not shown in the figure, the third through hole 31 may not be provided with internal threads, and the bolt may be inserted into the third through hole 31 and fixed by a nut.

[0044] It should also be noted that in this embodiment, the connecting element is a bolt, but this is not a limitation. The connecting element can also be a rivet. That is to say, the first frame 20 and the second frame 30 can be connected by riveting to achieve clamping of the heat exchange plate 10.

[0045] like Figure 2As shown, the first frame 20 has a first clamping surface 22 facing the heat exchange plate 10, which clamps the surface of the heat exchange plate 10 on a first side. The second frame 30 has a second clamping surface 36 facing the heat exchange plate 10, which clamps the surface of the heat exchange plate 10 on a second side. The first clamping surface 22 and the second clamping surface 36 correspond to each other and form a clamping space. By setting the first clamping surface 22 on the first frame 20 and the second clamping surface 36 on the second frame 30, the heat exchange plate 10 is clamped by the first clamping surface 22 and the second clamping surface 36, achieving surface-to-surface contact between the first frame 20 and the heat exchange plate 10, and between the second frame 30 and the heat exchange plate 10. Traditional welding methods only involve line contact, resulting in a small contact area and poor connection reliability. Surface-to-surface contact improves the reliability of the connection, thereby increasing the overall rigidity and strength of the lower housing.

[0046] like Figure 3 As shown, the first frame 20 includes two first side beams 23, two second side beams 24, and a connecting beam 25. Both first side beams 23 are arranged along a second direction and are spaced apart in a third direction. Both second side beams 24 are arranged along a third direction and are spaced apart in the second direction, connecting to the two first side beams 23 respectively. The first side beams 23 and the second side beams 24 form a frame-like structure. The connecting beam 25 is arranged along a third direction and located between the two second side beams 24, with both ends of the connecting beam 25 connected to the two first side beams 23 respectively. By providing the connecting beam 25, the frame-like structure formed by the first side beams 23 and the second side beams 24 can be reinforced, thereby improving the overall strength and height of the first frame 20.

[0047] like Figure 3 As shown, in this embodiment, the first frame 20 further includes a reinforcing beam 26. The reinforcing beam 26 is arranged parallel to the connecting beam 25 and located between the second side beam 24 and the connecting beam 25. Both ends of the reinforcing beam 26 are connected to the two first side beams 23 respectively. By providing the reinforcing beam 26, the strength of the first frame 20 can be further improved, thereby increasing the overall rigidity and strength of the lower box body.

[0048] For example, such as Figure 3 As shown, there are two reinforcing beams 26, located near the second side beam 24.

[0049] like Figure 4As shown, in the first direction, the first side beam 23 has a first abutting surface 231 that abuts against the first side of the heat exchange plate 10, and the second side beam 24 has a second abutting surface 241 that abuts against the first side of the heat exchange plate 10. The first abutting surface 231 and the second abutting surface 241 together form a first clamping surface 22. By providing the first abutting surface 231 on the first side beam 23 and the second abutting surface 241 on the second side beam 24, the two first side beams 23 and the two second side beams 24 cooperate to form a hollow "U"-shaped first clamping surface 22, thereby making contact with the surface of the heat exchange plate 10.

[0050] like Figure 1 and Figure 5 As shown, the second frame 30 includes: a third side beam 32, a fourth side beam 33, a connecting plate 34, and a reinforcing plate 35. The third side beam 32 is arranged along a second direction and has a first end and a second end. There are two third side beams 32, spaced apart in a third direction. The fourth side beam 33 is arranged along a third direction, and its two ends are respectively connected to the first ends of the two third side beams 32. The connecting plate 34 is arranged along a third direction, and its two ends are respectively connected to the second ends of the two third side beams 32. The third side beams 32, the fourth side beam 33, and the connecting plate 34 form a frame structure. The reinforcing plate 35 is arranged along a third direction and located between the fourth side beam 33 and the connecting plate 34. Its two ends are respectively connected to the two third side beams 32. By setting up the reinforcing beam 26, the third side beam 32, the fourth side beam 33 and the connecting plate 34 can be reinforced to form a frame structure, thereby improving the overall reliability of the second frame 30, and thus improving the strength and rigidity of the second frame 30, so as to provide effective support for the heat exchange plate 10, thereby improving the overall strength and rigidity of the lower box.

[0051] like Figure 1 As shown, in the first direction, the third side beam 32 has a third abutting surface 324 abutting against the second side of the heat exchange plate 10, the fourth side beam 33 has a fourth abutting surface 331 abutting against the second side of the heat exchange plate 10, and the connecting plate 34 has a fifth abutting surface 341 abutting against the second side of the heat exchange plate 10. The third abutting surface 324, the fourth abutting surface 331, and the fifth abutting surface 341 together form a second clamping surface 36. By providing the third abutting surface 324 on the third side beam 32, the fourth abutting surface 331 on the fourth side beam 33, and the fifth abutting surface 341 on the connecting plate 34, a hollow "U"-shaped second clamping surface 36 is formed. Figure 1 As shown, the first contact surface 231 corresponds to the third contact surface 324, and the two second contact surfaces 241 correspond to the fourth contact surface 331 and the fifth contact surface 341 respectively, thereby achieving stable clamping of the two heat exchange plates 10.

[0052] like Figure 6As shown, the third side beam 32 includes a beam body 321 and an eaves 322. The beam body 321 extends along a second direction and has a first side surface 3211 facing the second side of the heat exchange plate 10 in a first direction. The beam body 321 also has a second side surface 3212 facing another third side beam 32 in a third direction. The first side surface 3211 is connected to the second side surface 3212. The eaves 322 is disposed along the second side surface 3212 of the beam body 321 in the second direction and has a third side surface 3221 facing the second side of the heat exchange plate 10 in the first direction. The third side surface 3221 is connected to the first side surface 3211 to form a third contact surface 324. By providing the eaves 322, the contact area with the heat exchange plate 10 can be increased, which not only improves the stability of the clamping but also increases the contact area with the heat exchange plate 10, reducing the stress on the heat exchange plate 10.

[0053] like Figure 6 As shown, the eaves 322 has a fourth side surface 3222 facing away from the second side of the heat exchange plate 10 in the first direction. The fourth side surface 3222 is connected to the second side surface 3212 and forms a mounting groove 323, as shown. Figure 7 As shown, the end of the reinforcing plate 35 is located in the mounting groove 323 and connected to the eaves 322. That is to say, the eaves 322 can not only increase the contact area with the heat exchange plate 10, but also be used to connect with the end of the reinforcing plate 35. It is a typical example of one thing serving multiple purposes. Furthermore, since the reinforcing plate 35 is located in the mounting groove 323, it does not occupy additional space and avoids increasing the thickness of the lower housing.

[0054] like Figure 8 As shown, a first rib 342 is provided on the connecting plate 34 along a third direction. The first rib 342 protrudes towards the second side of the heat exchange plate 10, and the top surface of the first rib 342 forms a fifth abutment surface 341. By providing the first rib 342 on the connecting plate 34, the strength of the connecting plate 34 can be increased; on the other hand, the fifth abutment surface 341 can be formed on the top surface of the first rib 342, thereby abutting against the heat exchange plate 10 through the fifth abutment surface 341. The fifth abutment surface 341 corresponds to one of the second abutment surfaces 241, thereby clamping the heat exchange plate 10.

[0055] The reinforcing plate 35 has a first protrusion 351 facing the second side of the heat exchange plate 10, and the second side of the heat exchange plate 10 has a connecting protrusion 121 corresponding to the first protrusion 351. The first protrusion 351 is riveted to the connecting protrusion 121.

[0056] Specifically, such as Figure 1 and Figure 4As shown, the heat exchange plate 10 includes a heat-conducting plate 12 and a flow channel plate 13. The heat-conducting plate 12 has a first side and a second side disposed opposite to each other in a first direction. The first side of the heat-conducting plate 12 is a heat exchange surface for placing the battery module and exchanging heat with the battery module, and the second side of the heat-conducting plate 12 has a fastening surface. The connecting protrusion 121 is located on the side of the heat-conducting plate 12 away from the heat exchange surface, that is, on the fastening surface; the flow channel plate 13 fastens to the side of the heat-conducting plate 12 away from the heat exchange surface, that is, the flow channel plate 13 fastens and is connected to the fastening surface. The flow channel plate 13 is provided with a relief opening 131 corresponding to the connecting protrusion 121, and the connecting protrusion 121 passes through the relief opening 131.

[0057] Combination Figure 1 and Figure 4 As can be seen, the connecting protrusion 121 is located on the mating surface of the heat exchange plate 10, and the flow channel plate 13 is provided with a relief opening 131 corresponding to the connecting protrusion 121. After the flow channel plate 13 and the heat exchange plate 10 are fastened together, the connecting protrusion 121 passes through the relief opening 131, thereby abutting against the first protrusion 351. With this arrangement, it is equivalent to the heat conducting plate 12 and the reinforcing plate 35 being riveted together, forming a clamping force between them, so that the flow channel plate 13 can fit more tightly with the heat conducting plate 12, improving the reliability of the connection between the heat conducting plate 12 and the flow channel plate 13.

[0058] like Figure 1 and Figure 4 As shown, a first groove is formed on the heat exchange surface at the position corresponding to the connecting protrusion 121. That is, after the heat exchange plate 12 is recessed on one side of the mating surface, a connecting protrusion 121 is formed on the side away from the heat exchange surface. Therefore, a first groove is formed at the corresponding position on the heat exchange surface. By using this method, after the first protrusion 351 and the connecting protrusion 121 are riveted together, due to the presence of the first groove, even if the riveting position is slightly deformed, it will remain within the first groove and will not cause deformation of the heat exchange surface. Therefore, the flatness of the heat exchange surface can be ensured, thereby ensuring effective contact between the heat exchange surface and the battery module unit, and ensuring heat exchange efficiency.

[0059] like Figure 1 As shown, the connecting beam 25 has a connecting portion 251 for connecting with the battery module; the reinforcing plate 35 has a second protrusion 352 facing the second side of the heat exchange plate 10, the second protrusion 352 is positioned corresponding to the connecting beam 25, and the second protrusion 352 abuts against the second side of the heat exchange plate 10. The connecting beam 25, the heat exchange plate 10, and the second protrusion 352 are connected in sequence. That is to say, the connecting beam 25 of this utility model not only strengthens the first frame 20, but also connects to the battery module through the connecting portion 251, and acts as a module beam through its connection with the heat exchange plate 10 and the second protrusion 352, so as to achieve a fixed connection between the battery module and the lower housing.

[0060] For example, such as Figure 1 As shown, the connecting part 251 is a screw hole provided on the top of the connecting beam 25 for connection and fixation with the battery module. The heat exchange plate 10 is riveted to the connecting beam 25 by a rivet nut, and the second protrusion 352 on the reinforcing plate 35 is fixedly connected to the rivet nut by bolts, thereby achieving a fixed connection with the heat exchange plate 10.

[0061] Similarly, two reinforcing beams are also fixedly connected to the heat exchange plate 10, and the battery module can also be fixedly connected to the reinforcing beam 26. For example, one of the reinforcing beams 26 is located near the connecting plate 34, such as... Figure 8 As shown, the connecting plate 34 is also provided with a plurality of connecting bosses 343. The connecting bosses 343 are distributed at intervals along the third direction. All connecting bosses 343 correspond to the reinforcing beam 26. The connecting bosses 343 are provided with connecting holes. The connecting bosses 343 are used to connect with the heat exchange plate 10 and the reinforcing beam 26 so that the battery module is fixedly connected to the reinforcing beam 26.

[0062] For example, the heat exchange plate 10 and the reinforcing beam 26 are connected by rivet nuts, and the connecting plate 34 is fixedly connected to the heat exchange plate 10 by bolts. This achieves a fixed connection between the connecting plate 34, the heat exchange plate 10, and the reinforcing beam.

[0063] Another reinforcing beam 26 is located near the fourth side beam 33. This other reinforcing beam 26 and the heat exchange plate 10 are riveted together so that the module unit is fixedly connected to the other reinforcing beam 26.

[0064] According to a second aspect of the present invention, a battery pack is also disclosed, comprising: the aforementioned lower housing.

[0065] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of this utility model, and the utility model is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of this utility model, and these modifications and improvements are also considered to be within the protection scope of this utility model.

Claims

1. A lower housing, characterized in that, include: The heat exchange plate (10) has a first side and a second side in a first direction. The first side of the heat exchange plate (10) is used to support the battery module and exchange heat with the battery module. A first frame (20) is disposed on the first side of the heat exchange plate (10); The second frame (30) is disposed on the second side of the heat exchange plate (10) and corresponds to the first frame (20). A clamping space is formed between the first frame (20) and the second frame (30). The outer periphery of the heat exchange plate (10) is located in the clamping space. The first frame (20) and the second frame (30) clamp and fix the heat exchange plate (10).

2. The lower housing according to claim 1, characterized in that, The lower housing also includes: Multiple connectors are spaced apart along the outer periphery of the heat exchange plate (10); Each of the connectors is sequentially inserted through the first frame (20) and the heat exchange plate (10) and connected to the second frame (30) so that the first frame (20) and the second frame (30) clamp and fix the heat exchange plate (10).

3. The lower housing according to claim 1, characterized in that, The first frame (20) has a first clamping surface (22) facing the heat exchange plate (10), and the first clamping surface (22) clamps the surface of the heat exchange plate (10) on a first side; The second frame (30) has a second clamping surface (36) facing the heat exchange plate (10), the second clamping surface (36) clamps the surface of the heat exchange plate (10) on the second side, and the first clamping surface (22) corresponds to the second clamping surface (36) and forms the clamping space.

4. The lower housing according to claim 3, characterized in that, The first frame (20) includes: The two first side beams (23) are both arranged along the second direction, and the two first side beams (23) are distributed at intervals in the third direction; Two second side beams (24) are arranged along the third direction. The two second side beams (24) are spaced apart in the second direction and are respectively connected between the two first side beams (23). The first side beams (23) and the second side beams (24) form a frame structure. A connecting beam (25) is provided along the third direction and located between two second side beams (24). The two ends of the connecting beam (25) are respectively connected to two first side beams (23). The first direction, the second direction and the third direction intersect each other.

5. The lower housing according to claim 4, characterized in that, In the first direction, the first side beam (23) has a first abutting surface (231) abutting against the first side of the heat exchange plate (10), and the second side beam (24) has a second abutting surface (241) abutting against the first side of the heat exchange plate (10). The first abutting surface (231) and the second abutting surface (241) together form the first clamping surface (22).

6. The lower housing according to claim 4, characterized in that, The second frame (30) includes: The third side beam (32) is arranged along the second direction and has a first end and a second end. There are two third side beams (32), and the two third side beams (32) are arranged at intervals in the third direction. The fourth side beam (33) is arranged along the third direction, and the two ends of the fourth side beam (33) are respectively connected to the first ends of the two third side beams (32); A connecting plate (34) is provided along the third direction. The two ends of the connecting plate (34) are respectively connected to the second ends of the two third side beams (32). The third side beams (32), the fourth side beams (33) and the connecting plate (34) form a frame structure. A reinforcing plate (35) is disposed along the third direction and located between the fourth side beam (33) and the connecting plate (34). The two ends of the reinforcing plate (35) are respectively connected to the two third side beams (32). The first direction, the second direction and the third direction intersect each other.

7. The lower housing according to claim 6, characterized in that, In the first direction, the third side beam (32) has a third abutting surface (324) abutting against the second side of the heat exchange plate (10), the fourth side beam (33) has a fourth abutting surface (331) abutting against the second side of the heat exchange plate (10), and the connecting plate (34) has a fifth abutting surface (341) abutting against the second side of the heat exchange plate (10). The third abutting surface (324), the fourth abutting surface (331), and the fifth abutting surface (341) together form the second clamping surface (36).

8. The lower housing according to claim 7, characterized in that, The third side beam (32) includes: A beam (321) extends along the second direction, the beam (321) having a first side (3211) facing the second side of the heat exchange plate (10) in the first direction, and a second side (3212) facing the other third side beam (32) in the third direction, the first side (3211) being connected to the second side (3212); An eave (322) is provided on the second side (3212) of the beam (321) along the second direction. The eave (322) has a third side (3221) facing the second side of the heat exchange plate (10) in the first direction. The third side (3221) is connected to the first side (3211) to form the third abutment surface (324).

9. The lower housing according to claim 8, characterized in that, The eaves (322) have a fourth side surface (3222) facing away from the second side of the heat exchange plate (10) in the first direction. The fourth side surface (3222) is connected to the second side surface (3212) and forms a mounting groove (323). The end of the reinforcing plate (35) is located in the mounting groove (323) and connected to the eaves (322).

10. The lower housing according to claim 7, characterized in that, The connecting plate (34) is provided with a first rib (342) along the third direction. The first rib (342) protrudes toward the second side of the heat exchange plate (10), and the top surface of the first rib (342) forms the fifth abutment surface (341).

11. The lower housing according to claim 6, characterized in that, The reinforcing plate (35) has a first protrusion (351) facing the second side of the heat exchange plate (10), and the second side of the heat exchange plate (10) has a connecting protrusion (121) corresponding to the first protrusion (351), and the first protrusion (351) is riveted to the connecting protrusion (121).

12. The lower housing according to claim 6, characterized in that, The connecting beam (25) has a connecting portion (251) for connecting to the battery module; The reinforcing plate (35) has a second protrusion (352) facing the second side of the heat exchange plate (10). The second protrusion (352) corresponds to the position of the connecting beam (25). The second protrusion (352) abuts against the second side of the heat exchange plate (10). The connecting beam (25), the heat exchange plate (10) and the second protrusion (352) are connected in sequence.

13. A battery pack, characterized in that, include: The lower housing according to any one of claims 1 to 12.

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