Battery module, battery pack and power device

Abstract

The utility model discloses a battery module, battery pack and power plant, the battery module is provided with a plurality of battery cells, the plurality of battery cells are arranged along the first direction, a gap is arranged between every two adjacent battery cells, both ends of the battery module in the first direction are provided with end plates, and the end plates are arranged in the first direction. The length L of the battery module in the first direction meets the following condition: L = 2 * L1 + (a + x) * L2 + (a + x-1) * L3, L1 is the thickness of the end plate, L2 is the thickness of the battery monomers, L3 is the width of a gap between every two adjacent battery monomers, a is the number of the battery monomers, x is the adjustment value of the number of the battery monomers, the positive number is increasing, and the negative number is decreasing. According to the battery module disclosed by the utility model, different numbers of battery monomers are stacked and welded according to the electric quantity demand, so that the development cycle and cost of a module section tool are reduced, and different gradients of the electric quantity of a module section product and the adaptability to different electric quantity demands of a battery pack are improved; and the universality and compatibility of the battery single body stacking and welding tool are realized.

Description

Technical Field

[0001] This utility model relates to the field of power device manufacturing technology, and in particular to a battery module, battery pack and power device. Background Technology

[0002] The relevant technology indicates that adding a power battery pack system and an electric drive system to a traditional fuel vehicle to create a hybrid electric vehicle (PHEV) or a mild hybrid electric vehicle (HEV) helps the vehicle accelerate during start-up and recover kinetic energy during braking. This is one of the methods used by major automakers to solve the problem of high fuel consumption in traditional fuel vehicles and improve fuel economy. Fuel vehicles with this solution are also called new energy vehicles.

[0003] With the increasing demand for new energy vehicles, this solution is gradually becoming a standard feature in newly launched gasoline-powered vehicles.

[0004] Under this solution, the material cost of the vehicle increases. In order to reduce the impact of this cost increase on the car manufacturer's production cost and the purchasing power of car buyers, the capacity of this power battery pack is not very large, often 1.5kWh to 5kWh. At the same time, in various aspects of the power battery pack design, low investment, low cost and short development cycle are pursued.

[0005] Because different car brands have different sizes, wheelbases, and battery pack mounting positions on the chassis, it is difficult to promote a power battery pack that is compatible with all car brands. Utility Model Content

[0006] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, this invention provides a battery module that has a short development cycle, low cost, and good versatility and compatibility.

[0007] This utility model also proposes a battery pack having the above-mentioned battery module.

[0008] This utility model also proposes a power device having the above-mentioned battery pack.

[0009] According to a battery module of the first aspect of the present invention, the battery module has a plurality of battery cells arranged along a first direction, with a gap between each pair of adjacent battery cells, and end plates are provided at both ends of the battery module in the first direction. The length L of the battery module in the first direction satisfies:

[0010] L=2×L1+(a+x)×L2+(a+x-1)×L3

[0011] Wherein, L1 is the thickness of the end plate, L2 is the thickness of the battery cell, L3 is the gap width between each pair of adjacent battery cells, a is the number of battery cells, and x is the adjustment value for the number of battery cells, with positive numbers indicating an increase and negative numbers indicating a decrease.

[0012] According to the present invention, the battery module stacks and welds different numbers of battery cells according to power requirements, which reduces the development cycle and cost of module segment tooling, improves the adaptability of module segment products to different power gradients and different power requirements of battery packs, and realizes the universality and compatibility of battery cell stacking and welding tooling.

[0013] In some embodiments, the battery module further includes: a cold plate disposed on one side of the plurality of battery cells in a second direction, the second direction being perpendicular to the first direction, and the plurality of battery cells being bonded to the cold plate; a cover plate disposed on the other side of the plurality of battery cells in the second direction, and the cover plate being connected to the end plate; and a heating film disposed on the other side of the plurality of battery cells in the second direction and located between the cover plate and the battery cells, and the plurality of battery cells being bonded to the heating film.

[0014] A battery pack according to a second aspect of the present invention includes: a housing having a receiving cavity formed therein; and a battery module according to the first aspect embodiment of the present invention, wherein the battery module is disposed within the receiving cavity, and the length L' of the housing matches the length L of the battery module.

[0015] According to the battery pack of this utility model, by setting the battery module of the first aspect above, the length L' of the outer shell is matched with the length L of the battery module, thereby reducing the development cycle and cost of the module segment tooling, improving the different power gradients of the module segment products and the adaptability to different power requirements of the battery pack, realizing the universality and compatibility of the battery pack, and reducing the development and production costs of the battery pack.

[0016] In some embodiments, the housing includes a shell and a cover, the shell having a base plate and side beams arranged circumferentially on the base plate, the base plate and the side beams defining the receiving cavity, the cover for sealing the receiving cavity, a seal being provided between the cover and the side beams, and the side beams in a first direction having mounting components on a side facing away from the receiving cavity.

[0017] In some embodiments, the base plate includes a liner having a mounting portion thereon, the battery module being fixed within the mounting portion, the mounting portion of the liner being formed by bending.

[0018] In some embodiments, the base plate further includes a body and a buffer, the body being disposed on the side of the liner away from the receiving cavity, and the buffer being disposed on the side of the body away from the liner.

[0019] In some embodiments, the side beam includes a first beam and a second beam, the first beam and the second beam are arranged symmetrically at the center, both the first beam and the second beam are formed by bending, and the first beam and the second beam are connected end to end.

[0020] In some embodiments, the battery pack further includes: an electrical module disposed within the receiving cavity and electrically connected to the battery module; a BMS assembly disposed within the receiving cavity and electrically connected to the battery module; and a mounting panel disposed on the side beam, the mounting panel having multiple plugs.

[0021] In some embodiments, the mounting assembly includes a mounting beam and a bushing, the mounting beam being welded to the side beam, and the length of the mounting beam being adjustable.

[0022] The power device according to the third aspect of the present invention includes the battery pack according to the second aspect of the present invention.

[0023] According to the power device of this utility model, by setting the battery pack of the second aspect mentioned above, the production cost of the power device is reduced and the development cycle of the power device is shortened.

[0024] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a battery module according to a first aspect embodiment of the present invention;

[0026] Figure 2 yes Figure 1 A side view of the battery module shown;

[0027] Figure 3 yes Figure 2 A schematic cross-sectional view of the battery module at point AA shown in the diagram;

[0028] Figure 4 A schematic diagram of a battery pack according to a second aspect embodiment of the present invention;

[0029] Figure 5 yes Figure 4 A schematic diagram of the battery pack casing shown;

[0030] Figure 6 yes Figure 5 A front view schematic diagram of the housing shown;

[0031] Figure 7 yes Figure 6 A schematic cross-sectional view of the shell at point BB shown;

[0032] Figure 8 yes Figure 5 A rear view of the housing shown;

[0033] Figure 9 yes Figure 7 An enlarged cross-sectional schematic diagram of the side beam shown;

[0034] Figure 10 yes Figure 8 A schematic diagram of the cross-section at CC of the side beam shown;

[0035] Figure 11 yes Figure 4 The diagram shows an assembly of the battery pack.

[0036] Figure 12 yes Figure 11 The battery pack shown is an assembly diagram from another angle;

[0037] Figure 13 yes Figure 5 A schematic diagram of the casing from another angle;

[0038] Figure 14 yes Figure 13 A schematic diagram of the casing at another angle;

[0039] Figure 15 yes Figure 13 A side view of the housing shown;

[0040] Figure 16 yes Figure 4 An assembly diagram of the base plate of the battery pack shown;

[0041] Figure 17 yes Figure 4 A schematic diagram of the cover of the battery pack shown.

[0042] Figure label:

[0043] 100. Battery pack;

[0044] 10. Battery module;

[0045] 1. End plate; 2. Battery cell; 3. Cold plate; 4. Cover plate; 5. Heating film;

[0046] 20. Outer shell;

[0047] 21. Shell; 22. Cover; 23. Side beam; 231. First beam; 232. Second beam;

[0048] 24. Mounting components; 241. Mounting beam; 242. Bushing; 25. Seals;

[0049] 26. Base plate; 261. Liner plate; 262. Body; 263. Buffer component; 264. Sink; 265. Rib;

[0050] 27. Electrical module; 28. BMS assembly; 29. ​​Mounting panel;

[0051] 30. Explosion-proof valve; 31. Insert. Detailed Implementation

[0052] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0053] The following is for reference. Figures 1-3 A battery module 10 according to a first aspect embodiment of the present invention is described.

[0054] like Figure 1 As shown, the battery module 10 according to the first aspect of the present invention includes: an end plate 1 and a battery cell 2.

[0055] Specifically, the battery module 10 has multiple battery cells 2, which are arranged along a first direction. A gap is provided between each pair of adjacent battery cells 2. The battery module 10 has end plates 1 at both ends in the first direction. The length L of the battery module 10 in the first direction satisfies the following:

[0056] L=2×L1+(a+x)×L2+(a+x-1)×L3

[0057] Where L1 is the thickness of end plate 1, L2 is the thickness of battery cell 2, L3 is the gap width between each two adjacent battery cells 2, a is the number of battery cells 2, and x is the adjustment value for the number of battery cells 2, with positive numbers indicating an increase and negative numbers indicating a decrease.

[0058] Understandably, in order to achieve the universality and compatibility of cell stacking and welding fixtures, multiple battery cells 2 in the battery module 10 are arranged along a first direction (e.g., Figure 1The battery cells 2 shown are arranged in the left and right directions (which is also the thickness direction of the battery cells 2). Adjacent battery cells 2 are spaced apart, meaning there is a gap between adjacent battery cells 2. In the thickness direction of the battery cells 2, end plates 1 are provided at both ends of the battery module 10, and gaps can also be provided between the end plates 1 and the battery cells 2. Thus, the length L of the battery module 10 satisfies:

[0059] L=2×L1+(a+x)×L2+(a+x-1)×L3

[0060] Where L1 is the thickness of end plate 1, L2 is the thickness of battery cell 2, L3 is the gap width between each two adjacent battery cells 2, a is the number of battery cells 2, and x is the adjustment value for the number of battery cells 2. If x is positive, the number of battery cells 2 increases; if x is negative, the number of battery cells 2 decreases.

[0061] Referring to the above formula, it can be understood that the length L of the battery module 10 is: the thickness of the two end plates 1, the total thickness of the multiple battery cells 2, and the sum of the gaps between all adjacent battery cells 2.

[0062] According to the battery module 10 of this utility model embodiment, different numbers of battery cells 2 are stacked and welded according to power requirements, which reduces the development cycle and cost of module segment tooling, improves the different power gradients of module segment products and the adaptability to different power requirements of battery pack 100, and realizes the universality and compatibility of battery cell 2 stacking and welding tooling.

[0063] In some embodiments of this utility model, such as Figure 1 and Figure 3 As shown, the battery module 10 also includes: a cold plate 3, a cover plate 4, and a heating film 5. The cold plate 3 is disposed on one side of the plurality of battery cells 2 in a second direction, which is perpendicular to the first direction. The plurality of battery cells 2 are bonded to the cold plate 3. The cover plate 4 is disposed on the other side of the plurality of battery cells 2 in the second direction and is connected to the end plate 1. The heating film 5 is disposed on the other side of the plurality of battery cells 2 in the second direction and is located between the cover plate 4 and the battery cells 2. The plurality of battery cells 2 are bonded to the heating film 5. In other words, the cold plate 3 is bonded to the battery cells 2 to dissipate heat from the battery cells 2 and maintain the battery operating temperature within a suitable range. The cover plate 4 is connected to the end plate 1 to protect the battery cells 2 and help enhance the overall structural strength. The heating film 5 is bonded to the battery cells 2 and is used to provide heat to the battery in low-temperature environments to ensure that the battery operates at the optimal operating temperature. In this way, the battery operating temperature can be effectively managed, ensuring the safety and performance of the battery whether heat dissipation or heating is required.

[0064] The assembly process of the battery module 10 according to the present invention is described below: First, multiple battery cells 2 are arranged with a specified gap and the positive and negative electrodes and the acquisition lines are welded. After welding, the end plate 1 is installed. Then, glue is applied to the upper and lower surfaces of the multiple battery cells 2 respectively, and the cold plate 3 and the heating film 5 are bonded to the battery cells 2. Finally, the cover plate 4 is assembled, thereby completing the integrated installation of the battery module 10.

[0065] The battery pack 100 according to a second aspect embodiment of the present invention includes the battery module 10 according to the first aspect embodiment of the present invention described above.

[0066] Specifically, such as Figures 4-17 As shown, the battery pack 100 includes a housing 20 and a battery module 10 according to the first aspect embodiment of the present invention. A receiving cavity is formed within the housing 20, and the battery module 10 is disposed within the receiving cavity. The length L' of the housing 20 matches the length L of the battery module 10. It is understood that the length of the housing 20 can be adaptively adjusted according to the length of the battery module 10 to meet installation requirements and adapt to more usage scenarios.

[0067] According to the battery pack 100 of the present utility model embodiment, by setting the battery module 10 of the first aspect embodiment above, the length L' of the outer shell 20 is matched with the length L of the battery module 10, thereby reducing the development cycle and cost of the module segment tooling, improving the different gradients of the module segment product power and the adaptability to different power requirements of the battery pack 100, realizing the universality and compatibility of the battery pack 100, and reducing the development and production cost of the battery pack 100.

[0068] In some embodiments of this utility model, such as Figure 4 As shown, the housing 20 includes a shell 21 and a cover 22. The shell 21 has a base plate 26 and side beams 23 arranged circumferentially on the base plate 26. The base plate 26 and the side beams 23 define a receiving cavity. The cover 22 is used to seal the receiving cavity. A sealing element 25 is provided between the cover 22 and the side beams 23. A mounting assembly 24 is provided on the side of the side beams 23 in the first direction facing away from the receiving cavity. That is, the battery module 10 is disposed in the shell 21. In order to ensure the sealing of the receiving cavity, a sealing element 25 is provided between the cover 22 and the side beams 23. In addition, in order to facilitate the installation of the battery pack 100 and the power unit, a mounting assembly 24 is provided on the battery pack 100. In this way, the housing 20 can be adapted to more assembly environments, can effectively shorten the development cycle of the battery pack 100, and can also reduce the development cost and production cost of the battery pack 100.

[0069] In some embodiments of this utility model, such as Figure 7As shown, the base plate 26 includes a liner 261, which has a mounting portion. The battery module 10 is fixed within the mounting portion, and the mounting portion of the liner 261 is formed by bending. It is understood that the purpose of providing the liner 261 is to provide mounting points and support points for components within the battery pack 100, along the length of the battery pack 100 (e.g., ...). Figure 4 The first direction shown provides rigidity. The liner 261 is made by bending and some fastening nuts are projected onto the liner 261. It can still be assembled without specific molds and tooling, which greatly reduces the development cycle and cost.

[0070] Specifically, when the length of the battery module 10 changes, the lengths of the front side beam 23, the rear side beam 23, and the liner 261 can be changed simultaneously. Then, the base plate 26 is welded to the side beam 23, which enables the installation of modules of different specifications without modifying the mold, thus improving the assembly convenience of the battery pack.

[0071] Furthermore, such as Figure 7 As shown, the base plate 26 also includes a body 262 and a buffer member 263. The body 262 is located on the side of the liner 261 away from the receiving cavity, and the buffer member 263 is located on the side of the body 262 away from the liner 261. It can be understood that the body 262 is located between the buffer member 263 and the liner 261, and the buffer member 263 is a buffer and heat-insulating material, meaning it has both buffering and heat-insulating functions. Therefore, the base plate 26 has a simple structure and ingenious design, ensuring the installation strength of the base plate 26 while maintaining the versatility and compatibility of the battery pack 100, thus reducing the development and production costs of the battery pack 100.

[0072] Here, the main body 262 adopts a flat planar plate structure, and a buffer insulation material (i.e., buffer 263) is sprayed on the bottom of the main body 262, which protects the internal parts of the battery pack 100, has the function of resisting impacts and stone blows, and also helps to improve the heat preservation performance of the battery pack 100. In addition, the main body 262 and the mounting part form a cavity structure, which improves the length of the shell 21 (e.g., Figure 4 The stiffness in the first direction shown is such that when the length and / or width of the battery pack 100 needs to be changed, the size of the base plate 26 also changes with the size of the battery pack 100, eliminating the need for new molds and reducing cost investment.

[0073] Furthermore, the cover 22 can be made by bending, splicing and welding sheet metal. When the length and / or width of the battery pack 100 need to be changed, there is no need to invest in new molds, which reduces development costs and shortens the development cycle of the battery pack 100.

[0074] In some embodiments of this utility model, such as Figure 7 and Figure 9As shown, the side beam 23 includes a first beam member 231 and a second beam member 232. The first beam member 231 and the second beam member 232 are arranged symmetrically at the center. Both the first beam member 231 and the second beam member 232 are formed by bending, and the first beam member 231 and the second beam member 232 are connected end to end. Figure 9 As shown, the cross-sections of the first beam 231 and the second beam 232 are both L-shaped. The first beam 231 and the second beam 232 are connected end to end and welded together. In this way, the side beam 23 can be obtained by bending machine and welding machine without the need for specific molds and tooling, which reduces the development cycle and cost investment.

[0075] Furthermore, when the height of the battery module 10 changes, only the bending positions of the first beam 231 and the second beam 232 need to be changed, without modifying the mold, which is very convenient.

[0076] Preferably, the first beam 231 and the second beam 232 are laser welded.

[0077] In some embodiments, such as Figure 7 and Figure 9 As shown, the height H of the side beam 23 satisfies: 30mm≤H≤60mm; the distance H1 from the end of the side beam 23 to the connection position of the two adjacent beams satisfies: 1 / 4H≤H1≤1 / 3H; the depth of the sink 264 satisfies: 1 / 3H1≤H2≤2 / 3H1; the distance L between the surfaces of the two side beams 23 on opposite sides in the front-rear direction satisfies: 900mm≤L≤1300mm; the width of the sink 264 satisfies: 1 / 4L≤L3≤1 / 3L; thus, the bottom plate 26 forms a sandwich structure, which improves the impact resistance of the battery pack 100. At the same time, the sink 264 and the ribs 265 on both sides form a wave rib, which improves the rigidity of the battery pack 100 and improves the safety performance of the battery pack 100.

[0078] In some embodiments of this utility model, such as Figure 4 As shown, the battery pack 100 also includes an electrical module 27, a BMS assembly 28, and a mounting panel 29. The electrical module 27 is located within the receiving cavity and is electrically connected to the battery module 10. The BMS assembly 28 is located within the receiving cavity and is electrically connected to the battery module 10. The mounting panel 29 is located on the side beam 23 and has multiple inserts 31. It is understood that the mounting panel 29 is preferably installed on the front side beam 23 and / or the rear side beam 23. The mounting panel 29 is welded to the side beam 23. This minimizes the installation area of ​​the inserts 31, reduces the scrap rate of individual parts and the finished housing 21, and allows different manufacturers to have different requirements for the models of inserts 31. Only the mounting panel 29 needs to be replaced and then welded to the side beam 23. This reduces the need for modifications to the housing 21, shortens the overall component development cycle and cost, and improves the compatibility of the battery pack 100.

[0079] In some embodiments of this utility model, the mounting assembly 24 includes a mounting beam 241 and a bushing 242. The mounting beam 241 is welded to the side beam 23, and the length of the mounting beam 241 is adjustable. Figure 15 As shown, the mounting beam 241 can be a square tube structure, welded to the side beam 23 and located at both ends of the battery pack 100 in the length direction. When the installation requirements of the battery pack 100 are different, the mounting beam 241 can be adjusted in length and welding position on the side beam 23 to match more vehicle bodies and frames, thereby improving the adaptability and compatibility of the battery pack 100.

[0080] like Figure 4 As shown, the mounting components 24 include multiple components, which are arranged at intervals to ensure the installation stability of the battery pack 100.

[0081] In addition, the battery pack 100 is equipped with an explosion-proof valve 30 to improve the safety of the battery pack 100.

[0082] The power device according to a third aspect embodiment of the present invention includes a battery pack 100 according to the second aspect embodiment of the present invention described above.

[0083] According to the power device of the present utility model embodiment, by providing the battery pack 100 of the second aspect embodiment described above, the production cost of the power device is reduced and the development cycle of the power device is shortened.

[0084] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0085] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0086] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0087] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0088] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery module, characterized in that, The battery module has multiple battery cells arranged along a first direction, with a gap between each pair of adjacent battery cells. The battery module has end plates at both ends along the first direction, and the length L of the battery module along the first direction satisfies: L=2×L1+(a+x)×L2+(a+x-1)×L3 Wherein, L1 is the thickness of the end plate, L2 is the thickness of the battery cell, L3 is the gap width between each pair of adjacent battery cells, a is the number of battery cells, and x is the adjustment value for the number of battery cells, with positive numbers indicating an increase and negative numbers indicating a decrease.

2. The battery module according to claim 1, characterized in that, The battery module also includes: A cold plate is disposed on one side of a plurality of battery cells in a second direction, the second direction being perpendicular to the first direction, and the plurality of battery cells are bonded to the cold plate. A cover plate is disposed on the other side of the plurality of battery cells in a second direction, and the cover plate is connected to the end plate; A heating film is disposed on the other side of the plurality of battery cells in a second direction and located between the cover plate and the battery cells, and the plurality of battery cells are bonded to the heating film.

3. A battery pack, characterized in that, include: An outer casing, wherein a receiving cavity is formed within the outer casing; The battery module according to any one of claims 1-2, wherein the battery module is disposed within the receiving cavity, and the length L' of the outer shell matches the length L of the battery module.

4. The battery pack according to claim 3, characterized in that, The housing includes a shell and a cover, the shell having a base plate and side beams arranged circumferentially on the base plate, the base plate and the side beams defining the receiving cavity, the cover for sealing the receiving cavity, a seal being provided between the cover and the side beams, and the side beams in a first direction having a mounting assembly on a side facing away from the receiving cavity.

5. The battery pack according to claim 4, characterized in that, The base plate includes a liner plate, the liner plate having a mounting portion, the battery module being fixed within the mounting portion, and the mounting portion of the liner plate being formed by bending.

6. The battery pack according to claim 5, characterized in that, The base plate further includes a body and a buffer member, wherein the body is disposed on the side of the liner away from the receiving cavity, and the buffer member is disposed on the side of the body away from the liner.

7. The battery pack according to claim 6, characterized in that, The side beam includes a first beam and a second beam. The first beam and the second beam are arranged symmetrically at the center. Both the first beam and the second beam are formed by bending, and the first beam and the second beam are connected end to end.

8. The battery pack according to claim 4, characterized in that, Also includes: An electrical module is disposed within the receiving cavity and is electrically connected to the battery module; BMS assembly, wherein the BMS assembly is disposed within the receiving cavity and is electrically connected to the battery module; The mounting panel is located on the side beam and has multiple plugs.

9. The battery pack according to claim 4, characterized in that, The mounting assembly includes a mounting beam and a bushing, wherein the mounting beam is welded to the side beam, and the length of the mounting beam is adjustable.

10. A power unit, characterized in that, The battery pack includes any one of claims 3-9.

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