Battery modules and battery packs

Abstract

This invention provides a battery module and a battery pack. The battery module includes a cell assembly and end plates disposed on opposite sides of the cell assembly. The cell assembly includes a plurality of cells arranged in sequence. The end plates have a first groove on the surface opposite to the cell assembly and a second groove on the surface of the end plates close to the cell assembly. The first and second grooves are arranged opposite to each other. A first reinforcing rib is disposed in the first groove and a second reinforcing rib is disposed in the second groove. By providing a groove structure on opposite sides of the end plates, the weight of the end plates of the battery module can be reduced, thereby alleviating the problem in related technologies where the end plates of battery modules are too heavy, increasing the weight of the battery module and directly affecting the overall energy density and driving range of the battery pack.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more specifically to a battery module and a battery pack. Background Technology

[0002] In related technologies, lithium-ion power batteries, as a clean and efficient new energy source, are widely used in various industries such as automobiles, ships, forklifts, and energy storage. To meet the needs of different working conditions, several individual cells are usually assembled into battery modules, and then several battery modules are combined with various electrical components to form a battery pack packaged in a sealed box for customer use.

[0003] The installation process for battery modules involves first arranging the battery cells into groups to form a cell assembly, then fixing two end plates onto both ends of the cell assembly. Next, pressure is applied to both ends of the cell assembly to ensure the cells are tightly bonded together, thus forming the battery module. The end plates of the battery module are typically made of aluminum, and their significant weight increases the overall weight of the battery module, directly impacting the overall energy density and driving range of the battery pack. Summary of the Invention

[0004] The embodiments of the present invention provide a battery module and a battery pack, which can improve the technical problem in the related art where the end plate of the battery module is too heavy, which increases the weight of the battery module and thus directly affects the overall energy density and driving time of the battery pack.

[0005] In a first aspect, embodiments of the present invention provide a battery module comprising:

[0006] A battery cell assembly, comprising multiple battery cells arranged sequentially; and

[0007] End plates are disposed on opposite sides of the battery cell assembly;

[0008] The end plate has a first groove on the side facing away from the battery cell assembly and a second groove on the side facing the battery cell assembly. The first groove and the second groove are arranged opposite to each other. A first reinforcing rib is provided in the first groove and a second reinforcing rib is provided in the second groove.

[0009] In one embodiment, at least a portion of the second reinforcing ribs are misaligned with the corresponding first reinforcing ribs.

[0010] In one embodiment, the first reinforcing rib includes a first transverse rib, a first longitudinal rib, and a first diagonal rib. Each first transverse rib is connected to a plurality of first longitudinal ribs, each first longitudinal rib is connected to a plurality of first transverse ribs, and each first diagonal rib is connected to a plurality of first longitudinal ribs and a plurality of first transverse ribs.

[0011] In one embodiment, the second reinforcing rib includes a second transverse rib, a second longitudinal rib, and a second diagonal rib. Each second transverse rib is connected to a corresponding second longitudinal rib, each second longitudinal rib is connected to a corresponding second transverse rib, and each second diagonal rib is connected to a plurality of second longitudinal ribs and a plurality of second transverse ribs.

[0012] In one embodiment, the battery module further includes a reinforcing plate located between the end plate and the cell assembly and filling the second groove. The reinforcing plate has a third groove at the position corresponding to the second reinforcing rib, and the second reinforcing rib is engaged in the third groove. The side surface of the reinforcing plate facing away from the end plate is a flat surface.

[0013] In one embodiment, the reinforcing plate is made of rigid polyurethane.

[0014] In one embodiment, a limiting groove is further provided on the side surface of the end plate opposite to the battery cell assembly, and the limiting groove communicates with the first groove;

[0015] The battery module also includes a fixing strap, which is embedded in the limiting groove and binds the end plate to the cell assembly.

[0016] In one embodiment, the battery module further includes an insulating protective film disposed between the battery cell assembly and the fixing strip.

[0017] In one embodiment, the battery module includes a CCS assembly disposed above the cell assembly and connected to the cell assembly.

[0018] Secondly, embodiments of the present invention provide a battery pack, which includes a battery box and a battery module of one of the foregoing embodiments, the battery module being assembled inside the battery box.

[0019] The beneficial effects of the embodiments of the present invention are as follows:

[0020] In an embodiment of the present invention, by providing a first groove on the side surface of the end plate of the battery module away from the cell assembly and a second groove on the side surface near the cell assembly, with the first groove and the second groove being arranged opposite to each other, a first reinforcing rib being provided in the first groove and a second reinforcing rib being provided in the second groove, the weight of the end plate of the battery module can be reduced, thereby improving the technical problem in the related art where the end plate of the battery module is too heavy, increasing the weight of the battery module and thus directly affecting the overall energy density and driving time of the battery pack. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A three-dimensional structural diagram of a battery module provided for an embodiment of the present invention.

[0023] Figure 2 for Figure 1 An exploded view of the battery module.

[0024] Figure 3 for Figure 2 A detailed structural diagram of the outer surface of the end plate.

[0025] Figure 4 for Figure 2 A detailed structural diagram of the inner surface of the end plate.

[0026] Figure 5 for Figure 3 A schematic diagram of a cross-sectional structure of the middle plate.

[0027] Figure 6 for Figure 4 A schematic diagram of a cross-sectional structure of the middle plate.

[0028] Figure 7 This is a schematic diagram of the structure of the first surface of the reinforcing plate provided in an embodiment of the present invention.

[0029] Figure 8 This is a schematic diagram of the structure of the second surface of the reinforcing plate provided in an embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 100. Battery module;

[0032] 10. Battery cell assembly; 11. Battery cell;

[0033] 20. End plate; 21. First groove; 22. Second groove; 23. Limiting groove; 24. Fixing hole;

[0034] 25. Clearance groove; 201. Outer surface; 202. Inner surface; 211. First transverse rib;

[0035] 212. The first longitudinal reinforcement; 213. The first oblique reinforcement; 221. The second transverse reinforcement;

[0036] 222. Second longitudinal reinforcement; 223. Second diagonal reinforcement;

[0037] 30. CCS component;

[0038] 40. Fixing strap;

[0039] 50. Insulating protective film;

[0040] 60. Adhesive;

[0041] 70. Reinforcing plate; 71. Third groove; 701. First surface; 702. Second surface;

[0042] 711, First sub-slot; 712, Second sub-slot; 713, Third sub-slot. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present invention and are not intended to limit the present invention. In the present invention, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0044] Please refer to Figures 1 to 4 , Figure 1 This is a three-dimensional structural diagram of a battery module provided in an embodiment of the present invention. Figure 2 for Figure 1 Exploded view of the battery module in the middle. Figure 3 for Figure 2 A detailed structural diagram of the outer surface of the end plate in the middle. Figure 4 for Figure 2 A detailed structural diagram of the inner surface of the end plate. Combined with... Figure 1 and Figure 2 The battery module 100 includes a cell assembly 10 and end plates 20 disposed on opposite sides of the cell assembly 10. The cell assembly 10 includes a plurality of cells 11 arranged sequentially. The plurality of cells 11 are arranged sequentially along the length direction of the battery module 100, and the cells 11 can be square cells 11.

[0045] There are two end plates 20, which are arranged along the length of the cell assembly 10. One end plate 20 is located on one side of the cell assembly 10, and the other end plate 20 is located on the other side of the cell assembly 10. The two end plates 20 are symmetrical about the cell assembly 10. Each end plate 20 includes an outer surface 201 facing away from the cell assembly 10 and an inner surface 202 close to the cell assembly 10. The surface of the end plate 20 facing away from the cell assembly 10 is the outer surface 201, and the surface of the end plate 20 close to the cell assembly 10 is the inner surface 202. The outer surface 201 and the inner surface 202 are arranged opposite to each other.

[0046] Continue to refer to Figure 2 The battery module 100 further includes a CCS assembly 30 disposed above the cell assembly 10, and the CCS assembly 30 is connected to the cell assembly 10. Optionally, the CCS assembly 30 includes several interconnected connecting pieces, a plastic bracket, a temperature sensing component, and a voltage sensing component. The connecting pieces, the temperature sensing component, and the voltage sensing component are all disposed on the plastic bracket. The connecting pieces are connected to the terminal of each cell 11 in the cell assembly 10, and adjacent cells 11 can be connected in series through the connecting pieces. At the same time, the connecting pieces are also connected to the sensing harness of the temperature sensing component, so that the temperature sensing component can sense the temperature of the cell 11. The voltage sensing component is also connected to the connecting pieces through the sensing harness, and the voltage sensing component can sense the voltage of the corresponding cell 11.

[0047] Furthermore, the battery module 100 also includes a fixing strap 40, which is used to bind and fix the end plate 20 to the cell assembly 10. Specifically, during the assembly of the battery module 100, multiple cells 11 are stacked sequentially to form a cell assembly 10, and two end plates 20 are respectively installed on both ends of the cell assembly 10. Then, a compressive force is applied to the end plates 20 at both ends. When the length of the battery module 100 reaches the installation size, while maintaining the length of the battery module 100, the fixing strap 40 is fitted onto the end plates 20, and then the compressive force is released, so that the fixing strap 40 generates a binding force on the battery module 100.

[0048] Optionally, to ensure the effective fixation of the fixing straps 40 to the battery module 100, the number of fixing straps 40 may be at least two. The fixing straps 40 include steel strips, such as those made of stainless steel (SUS) or other high-strength steel. The steel strips have good tensile strength and can provide sufficient strength after the battery module 100 is assembled, ensuring a good fixation effect for the battery module 100.

[0049] Furthermore, the battery module 100 also includes an insulating protective film 50, which is disposed between the battery cell assembly 10 and the fixing strip 40. The insulating protective film 50 provides good insulation, effectively preventing short circuits. Moreover, the insulating protective film 50 also protects the battery cell assembly 10, preventing direct contact between the fixing strip 40 and the battery cell 11, thus avoiding damage to the outer insulating film of the battery cell 11. The insulating protective film 50 includes at least one of the following insulating films: PET (Polyethylene terephthalate) film, PVC (Polyvinyl chloride) film, and PI (Polyimide) film.

[0050] Optionally, the battery module 100 further includes an adhesive 60 disposed between adjacent battery cells 11. The adhesive 60 can be considered as an insulating material, insulating the two adjacent battery cells 11. Simultaneously, the adhesive 60 can also create gaps between adjacent battery cells 11 to support the insulating space between them, maintain parallelism between adjacent battery cells 11, improve compression resistance, and prevent undesirable contact between adjacent battery cells 11 upon impact. Optionally, the adhesive 60 includes at least one of structural adhesives, aerogels, or other adhesive materials that are viscous and possess excellent shock absorption, cushioning, heat insulation, and sound absorption properties.

[0051] The specific structure of the end plate 20 will be described in detail below.

[0052] Reference Figure 3 The end plate 20 has a first groove 21 on its surface opposite to the battery cell assembly 10. That is, the outer surface 201 of the end plate 20 has the first groove 21. The area of ​​the first groove 21 occupies one-third to four-fifths of the area of ​​the outer surface 201 of the end plate 20, such as one-half or three-quarters. However, the invention is not limited to this; those skilled in the art can design the area of ​​the first groove 21 according to requirements. It is understood that the smaller the area ratio of the first groove 21, the greater the strength of the end plate 20; and the larger the area ratio of the first groove 21, the better the weight reduction effect of the end plate 20.

[0053] The first groove 21 includes a groove bottom and multiple groove walls surrounding the groove bottom. For example, when the first groove 21 is square, the first groove 21 includes four groove walls. By providing the first groove 21 on the outer surface 201, the weight of the end plate 20 can be reduced, thereby reducing the weight of the battery module 100 and increasing the energy density of the battery module 100.

[0054] Optionally, the end plate 20 can be made of metal materials such as aluminum profiles. For example, the end plate 20 is made of aluminum, which is lighter and has better heat dissipation than other metal materials. By providing the first groove 21 on the outer surface 201 of the end plate 20, the thickness of the outer surface 201 of the end plate 20 can be reduced, thereby reducing the amount of material used in the die-casting process of forming the end plate 20. This reduces the weight of the end plate 20 and also lowers the cost of manufacturing it.

[0055] A first reinforcing rib is provided within the first groove 21 to structurally reinforce the end plate 20. The first reinforcing rib includes a first transverse rib 211, a first longitudinal rib 212, and a first diagonal rib 213, such as... Figure 3 The illustration schematically shows three first horizontal ribs 211, three first vertical ribs 212, and two first diagonal ribs 213, but the invention is not limited thereto. The first reinforcing ribs of the invention may include more or fewer first horizontal ribs 211, first vertical ribs 212, and first diagonal ribs 213. Those skilled in the art can design the number of reinforcing ribs according to requirements. It is understood that the more first horizontal ribs 211, first vertical ribs 212, and first diagonal ribs 213 there are, the better the reinforcement effect on the end plate 20; the fewer first horizontal ribs 211, first vertical ribs 212, and first diagonal ribs 213 there are, the better the weight reduction effect on the end plate 20.

[0056] The first horizontal rib 211, the first vertical rib 212, and the first diagonal rib 213 are all disposed at the bottom of the first groove 21. The first horizontal rib 211 is connected to two opposite groove walls of the first groove 21, the first vertical rib 212 is connected to two opposite groove walls of the first groove 21, and the first diagonal rib 213 is connected to two adjacent groove walls of the first groove 21. Each first horizontal rib 211 is connected to multiple first vertical ribs 212, each first vertical rib 212 is connected to multiple first horizontal ribs 211, and each first diagonal rib 213 is connected to multiple first vertical ribs 212 and multiple first horizontal ribs 211.

[0057] Optionally, the first reinforcing rib is made of the same material as the end plate 20, that is, the first reinforcing rib is also made of aluminum profile. This allows the first reinforcing rib and the end plate 20 to be integrally formed, resulting in higher connection stability, better reinforcement of the end plate 20, and simplified manufacturing process. Of course, the invention is not limited to this; the first reinforcing rib can also be formed of other high-hardness materials, such as high-hardness plastic materials.

[0058] Furthermore, the end plate 20 is provided with a limiting groove 23 on the outer surface 201 of the cell assembly 10 away from the end plate 20. The limiting groove 23 communicates with the first groove 21. The limiting groove 23 is located on opposite sides of the first groove 21, and each side of the first groove 21 has two limiting grooves 23, which are spaced apart. The fixing band 40 is embedded in the limiting groove 23, and the limiting groove 23 is used to limit the fixing band 40 to prevent the position of the fixing band 40 and the end plate 20 from changing in the battery module 100, thereby better resisting the expansion force from each cell 11 in the cell assembly 10.

[0059] Optionally, the depth of the limiting groove 23 is less than the depth of the first groove 21, and the heights of the first horizontal rib 211, the first vertical rib 212, and the first oblique rib 213 are all less than the difference in depth between the first groove 21 and the limiting groove 23, so as to avoid the first horizontal rib 211, the first vertical rib 212, and the first oblique rib 213 interfering with the fixing band 40.

[0060] Furthermore, the end plate 20 is also provided with fixing holes 24 penetrating the end plate 20, and the fixing holes 24 are located on opposite sides of the first groove 21. The fixing holes 24 are used to install and fix the battery module 100 in the battery box. The number of fixing holes 24 can be designed according to the weight of the entire battery module 100. In this embodiment, two fixing holes 24 are provided on each end plate 20, so there are a total of four fixing holes 24 on the entire battery module 100.

[0061] Optionally, the end plate 20 is further provided with a clearance groove 25, which is located between the two fixing holes 24 and close to the CCS assembly 30. The CCS assembly 30 connects each of the cells 11 of the cell group 10 in series and outputs power through positive and negative terminals. An insulating base can be placed in the clearance groove 25 to install the positive and negative output terminals on the CCS assembly 30, ensuring that the installation height of the positive and negative output terminals on the CCS assembly 30 does not exceed the height of the battery module 100, thereby reducing the space occupied by the battery module 100. Furthermore, each end plate 20 is provided with two clearance grooves 25, so the end plates 20 no longer need to be distinguished as front end plate 20 and rear end plate 20, and the end plates 20 can be manufactured using the same mold.

[0062] Reference Figure 4The end plate 20 has a second groove 22 on its surface near the cell assembly 10, that is, the second groove 22 is provided on the inner surface 202 of the end plate 20. This further reduces the weight of the end plate 20, thereby reducing the weight of the battery module 100 and increasing the energy density of the battery module 100. Simultaneously, by providing the second groove 22 on the inner surface 202 of the end plate 20, the thickness of the inner surface 202 of the end plate 20 can be reduced, thereby reducing the amount of material used in the die-casting process of the end plate 20. Thus, while reducing the weight of the end plate 20, the manufacturing cost of the end plate 20 can also be reduced.

[0063] The first groove 21 and the second groove 22 are arranged opposite to each other, but are not connected. The space between the first groove 21 and the second groove 22 is the body portion of the end plate 20. Optionally, the area of ​​the second groove 22 occupies one-third to four-fifths of the area of ​​the inner surface 202 of the end plate 20, such as one-half or three-quarters. However, the present invention is not limited to this, and those skilled in the art can design the area of ​​the second groove 22 according to requirements. It is understood that the smaller the area ratio of the second groove 22, the greater the strength of the end plate 20; the larger the area ratio of the second groove 22, the better the weight reduction effect of the end plate 20. Moreover, the orthographic projection of the second groove 22 on the end plate 20 completely covers the orthographic projection of the first groove 21 on the end plate 20, and the orthographic projection area of ​​the second groove 22 is larger than the orthographic projection area of ​​the first groove 21, so as to maximize the second groove 22 and thereby maximize the weight reduction of the end plate 20.

[0064] Specifically, the second groove 22 includes a groove bottom and multiple groove walls surrounding the groove bottom. For example, when the second groove 22 is square, it includes four groove walls. A second reinforcing rib is provided within the second groove 22 to further strengthen the structure of the end plate 20.

[0065] The second reinforcing bar includes a second transverse bar 221, a second longitudinal bar 222, and a second diagonal bar 223, such as Figure 4The illustration schematically shows three second transverse ribs 221, three second longitudinal ribs 222, and two second diagonal ribs 223. However, the invention is not limited to this. The second reinforcing ribs of the invention may include more or fewer second transverse ribs 221, second longitudinal ribs 222, and second diagonal ribs 223. Those skilled in the art can design the number of reinforcing ribs according to requirements. It is understood that the more second transverse ribs 221, second longitudinal ribs 222, and second diagonal ribs 223 there are, the better the reinforcement effect on the end plate 20; the fewer second transverse ribs 221, second longitudinal ribs 222, and second diagonal ribs 223 there are, the better the weight reduction effect on the end plate 20.

[0066] The second horizontal rib 221, the second vertical rib 222, and the second diagonal rib 223 are all disposed at the bottom of the second groove 22, and the heights of the second horizontal rib 221, the second vertical rib 222, and the second diagonal rib 223 are all less than the depth of the second groove 22. Specifically, the second horizontal rib 221 is connected to two opposite groove walls of the second groove 22, the second vertical rib 222 is connected to two opposite groove walls of the second groove 22, and the second diagonal rib 223 is connected to two adjacent groove walls of the second groove 22.

[0067] Each second horizontal rib 221 is connected to a second vertical rib 222, each second vertical rib 222 is connected to a second horizontal rib 221, and each second diagonal rib 223 is connected to a plurality of second vertical ribs 222 and a plurality of second horizontal ribs 221. That is, at least some of the second horizontal ribs 221 and the second vertical ribs 222 are discontinuous. For example, there is a gap between the second horizontal ribs 221 in the same row and a gap between the second vertical ribs 222 in the same column. In this way, while satisfying the requirement of enhancing the structural strength of the end plate 20, the weight of the end plate 20 can also be further reduced.

[0068] Optionally, the material of the second reinforcing rib can also be the same as that of the end plate 20, that is, the material of the second reinforcing rib is also aluminum profile. In this way, the second reinforcing rib and the end plate 20 can be integrally formed, which makes the connection stability between the second reinforcing rib and the end plate 20 higher, the reinforcement effect of the end plate 20 better, and also simplifies the manufacturing process. Of course, the present invention is not limited to this. The second reinforcing rib of the present invention can also be formed of other high-hardness materials, such as high-hardness plastic materials.

[0069] In one embodiment, reference is made to... Figures 1 to 6 , Figure 5 for Figure 3 A schematic diagram of a cross-sectional structure of the middle end plate. Figure 6 for Figure 4A schematic diagram of a cross-sectional structure of the middle plate. (Refer to...) Figure 5 and Figure 6 At least some of the second reinforcing ribs are misaligned with the corresponding first reinforcing ribs to further improve the reinforcing effect of the first and second reinforcing ribs on the end plate 20.

[0070] Specifically, some of the second horizontal reinforcing bars 221 are misaligned with the corresponding first horizontal reinforcing bars 211, some of the second vertical reinforcing bars 222 are misaligned with the corresponding first vertical reinforcing bars 212, and some of the second diagonal reinforcing bars 223 are misaligned with the corresponding first diagonal reinforcing bars 213. For example... Figure 6 As shown, some of the second longitudinal ribs 222 are offset from the corresponding first longitudinal ribs 212, and the second oblique ribs 223 are offset from the corresponding first oblique ribs 213. Of course, in order to achieve structural symmetry of the first reinforcing ribs in the first groove 21 and the second reinforcing ribs in the second groove 22, one of the first longitudinal ribs 212 located in the middle part of the first groove 21 and one of the second longitudinal ribs 222 located in the middle part of the second groove 22 can be arranged to overlap.

[0071] It should be noted that, in this embodiment, "misalignment" refers to two structural components not completely overlapping or not overlapping at all. For example, the misalignment of the second oblique rib 223 and the corresponding first oblique rib 213 means that the orthographic projection of the second oblique rib 223 on the end plate 20 is not completely overlapping or not overlapping at all with the orthographic projection of the first oblique rib 213 on the end plate 20. This makes the reinforcement position of the second oblique rib 223 on the end plate 20 different from the reinforcement position of the first oblique rib 213 on the end plate 20, thereby further enhancing the reinforcement effect of the second oblique rib 223 and the first oblique rib 213 on the end plate 20.

[0072] In one embodiment, please refer to Figures 1 to 8 , Figure 7 This is a schematic diagram of the structure of the first surface of the reinforcing plate provided in an embodiment of the present invention. Figure 8 This is a schematic diagram of the structure of the second surface of the reinforcing plate provided in an embodiment of the present invention. (Refer to...) Figure 2 The battery module 100 further includes a reinforcing plate 70, which is located between the end plate 20 and the cell assembly 10. The reinforcing plate 70 fills the second groove 22 to further reinforce the end plate 20.

[0073] Optionally, the reinforcing plate 70 may be made of materials such as rigid polyurethane (RPU), which possess properties of strength, heat resistance, wear resistance, impact resistance, vibration resistance, and insulation. The reinforcing plate 70 can be formed by filling the inner surface 202 of the end plate 20 with polyurethane or other foaming materials through casting, thereby filling the remaining space of the inner surface 202 of the end plate 20, enhancing the mechanical strength of the end plate 20, and improving its impact and vibration resistance. Furthermore, filling the inner surface 202 of the end plate 20 with the reinforcing plate 70 is equivalent to replacing part of the end plate 20, reducing the material usage of the end plate 20 and offering a price advantage.

[0074] Specifically, refer to Figure 4 and Figure 7 After the reinforcing plate 70 fills the inner surface 202 of the end plate 20, a third groove 71 is formed on the reinforcing plate 70 at the position corresponding to the second reinforcing rib, so that the second reinforcing rib is engaged in the third groove 71. Specifically, the surface of the reinforcing plate 70 near the end plate 20 is defined as the first surface 701, and the surface of the reinforcing plate 70 away from the end plate 20 is defined as the second surface 702. The third groove 71 is formed on the first surface 701. The third groove 71 includes a first sub-groove 711, a second sub-groove 712, and a third sub-groove 713. The second transverse rib 221 is engaged in the first sub-groove 711, the second longitudinal rib 222 is engaged in the second sub-groove 712, and the second oblique rib 223 is engaged in the third sub-groove 713, so that the reinforcing plate 70 and the end plate 20 are tightly bonded together to enhance the mechanical strength of the end plate 20.

[0075] Reference Figure 8 The reinforcing plate 70 has a flat surface on the side facing away from the end plate 20, meaning the second surface 702 of the reinforcing plate 70 is flat. The second surface 702 contacts the battery cell assembly 10. The flatness of the second surface 702 improves the stability of the contact with the battery cell assembly 10, thereby allowing the fixing strap 40 to more firmly fix the end plate 20 and the battery cell assembly 10 together.

[0076] In one embodiment, the present invention also provides a battery pack, the battery pack including a battery box and a battery module 100 of one of the foregoing embodiments, the battery module 100 being assembled inside the battery box.

[0077] As can be seen from the above embodiments:

[0078] This invention provides a battery module and a battery pack. The battery module includes a cell assembly and end plates disposed on opposite sides of the cell assembly. The cell assembly includes a plurality of cells arranged sequentially. The end plates have a first groove on the surface opposite to the cell assembly and a second groove on the surface near the cell assembly. The first groove and the second groove are disposed opposite to each other. A first reinforcing rib is disposed in the first groove and a second reinforcing rib is disposed in the second groove. By providing a groove structure on opposite sides of the end plates, the weight of the end plates of the battery module can be reduced, thus alleviating the problem in related technologies where the end plates of battery modules are too heavy, increasing the weight of the battery module and directly affecting the overall energy density and range of the battery pack.

[0079] The embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A battery module, characterized in that, include: A battery cell assembly consists of multiple battery cells arranged in sequence. as well as End plates are disposed on opposite sides of the battery cell assembly; The end plate has a first groove on the side facing away from the battery cell assembly and a second groove on the side facing the battery cell assembly. The first groove and the second groove are arranged opposite to each other. A first reinforcing rib is provided in the first groove and a second reinforcing rib is provided in the second groove. The first groove and the second groove are not connected. The battery module also includes a reinforcing plate, which is cast between the end plate and the cell assembly to fill the second groove and make the side surface of the reinforcing plate away from the end plate a flat surface; the reinforcing plate is provided with a third groove at the position corresponding to the second reinforcing rib, and the second reinforcing rib is engaged in the third groove.

2. The battery module according to claim 1, characterized in that, At least some of the second reinforcing ribs are misaligned with the corresponding first reinforcing ribs.

3. The battery module according to claim 1, characterized in that, The first reinforcing bar includes a first transverse bar, a first longitudinal bar, and a first diagonal bar. Each first transverse bar is connected to a plurality of first longitudinal bars, each first longitudinal bar is connected to a plurality of first transverse bars, and each first diagonal bar is connected to a plurality of first longitudinal bars and a plurality of first transverse bars.

4. The battery module according to claim 1, characterized in that, The second reinforcing bar includes a second transverse bar, a second longitudinal bar, and a second diagonal bar. Each second transverse bar is connected to a corresponding second longitudinal bar, each second longitudinal bar is connected to a corresponding second transverse bar, and each second diagonal bar is connected to a plurality of second longitudinal bars and a plurality of second transverse bars.

5. The battery module according to claim 1, characterized in that, The reinforcing plate is made of rigid polyurethane.

6. The battery module according to any one of claims 1 to 4, characterized in that, The end plate is also provided with a limiting groove on the side surface opposite to the battery cell assembly, and the limiting groove is connected to the first groove. The battery module also includes a fixing strap, which is embedded in the limiting groove and binds the end plate to the cell assembly.

7. The battery module according to claim 6, characterized in that, It also includes an insulating protective film, which is disposed between the battery cell assembly and the fixing strip.

8. The battery module according to any one of claims 1 to 4, characterized in that, The battery module includes a CCS component, which is disposed above the cell assembly and connected to the cell assembly.

9. A battery pack, characterized in that, It includes a battery box and a battery module as described in any one of claims 1 to 8, wherein the battery module is assembled inside the battery box.

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