Battery module, battery pack and electric device

Abstract

The application provides a battery module, a battery pack and a power utilization equipment. The battery module comprises a first end plate, a second end plate, a plurality of first battery cells, a third end plate and a plurality of second battery cells. The first end plate, the second end plate and the third end plate are sequentially and spacedly arranged along a first direction. The third end plate is fixed opposite to the first end plate. The plurality of first battery cells are arranged between the first end plate and the second end plate and arranged in an array along the first direction. The plurality of second battery cells are arranged between the second end plate and the third end plate and arranged in an array along the first direction. The second end plate has a mounting hole penetratingly arranged along a second direction. The size of the mounting hole along the first direction is greater than the size of the mounting hole along a third direction. The first direction, the second direction and the third direction are perpendicular to each other. The battery module, the battery pack and the power utilization equipment provided by the application can improve the assembly efficiency of the battery module in a box while ensuring the anti-deformation ability and the energy density of the battery module.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and in particular relates to a battery module, a battery pack and an electrical device. Background Technology

[0002] With the continuous development of battery pack technology, users have increasingly higher performance requirements for battery packs, such as energy density and resistance to deformation. However, currently, the 26-cell modules in energy storage battery packs are generally composed of two 1P13S modules, resulting in a battery pack with more components, larger size, and lower energy density. Some related technologies directly connect the 26 cells in series to form a 1P26S module, resulting in an excessively long battery pack with lower resistance to deformation. Furthermore, during the assembly process, unavoidable dimensional errors in the cells can lead to misalignment between the battery module's end plate and the mounting position in the casing, affecting assembly efficiency. Utility Model Content

[0003] To address the shortcomings of existing technologies, this application provides a battery module, battery pack, and electrical equipment that can improve the assembly efficiency of battery modules into the housing while ensuring the deformation resistance and energy density of the battery module.

[0004] On one hand, this application provides a battery module, including: First end plate; The second end plate is spaced apart from the first end plate along a first direction; Multiple first cells are disposed between the first end plate and the second end plate and arranged along the first direction; The third end plate is disposed on the side of the second end plate away from the first end plate and spaced apart from the second end plate along the first direction; the third end plate is fixed relative to the first end plate. Multiple second cells are disposed between the second end plate and the third end plate and arranged along the first direction; The second end plate has a mounting hole that extends through the second direction, and the size of the mounting hole along the first direction is larger than the size of the mounting hole along the third direction; the first direction, the second direction, and the third direction are perpendicular to each other.

[0005] In one possible implementation, the mounting hole includes a first hole and a second hole, the first hole and the second hole being spaced apart along the third direction; the dimension of the first hole along the first direction is greater than the dimension of the first hole along the third direction, and the dimension of the second hole along the first direction is greater than the dimension of the second hole along the third direction.

[0006] In one possible implementation, the first hole is disposed near the second end plate on one side along the third direction, and the second hole is disposed near the second end plate on the other side along the third direction.

[0007] In one possible implementation, the battery module further includes a plurality of heat insulation pads and a plurality of buffer pads; in the first direction, a heat insulation pad and a buffer pad are disposed between any two adjacent first cells and between any two adjacent second cells, the projections of the heat insulation pad and the buffer pad between any two adjacent first cells and between any two adjacent second cells in the first direction do not coincide, and the thickness of the buffer pad in the first direction is greater than the thickness of the heat insulation pad in the first direction.

[0008] In one possible implementation, the buffer pad includes a first buffer pad and a second buffer pad; the first buffer pad is disposed on one side of the heat insulation pad along the second direction, and the thickness of the first buffer pad in the first direction is greater than the thickness of the heat insulation pad in the first direction; the second buffer pad is disposed on the other side of the heat insulation pad along the second direction, and the thickness of the second buffer pad in the first direction is greater than the thickness of the heat insulation pad in the first direction.

[0009] In one possible implementation, the first cushioning pad and the heat insulation pad are spaced apart in the second direction, and the second cushioning pad and the heat insulation pad are spaced apart in the second direction.

[0010] In one possible implementation, the battery module further includes a first fixing band and a second fixing band. The first fixing band is fixedly sleeved on the first end plate, the plurality of first cells, the second end plate, the plurality of second cells, and the third end plate. The second fixing band is fixedly sleeved on the first end plate, the plurality of first cells, the second end plate, the plurality of second cells, and the third end plate. The second fixing band and the first fixing band are spaced apart along the second direction.

[0011] In one possible implementation, the first fixing strap and the second fixing strap have the same thickness, and the thickness of the first fixing strap and the second fixing strap ranges from [1.2, 1.8] mm.

[0012] In one possible implementation, a plurality of the first battery cells, the second end plate, and a plurality of the second battery cells are arranged to form a slot.

[0013] In one possible implementation, the battery module further includes a bonding bar that covers at least a portion of the second end plate. One end of the bonding bar in the first direction is located on the side of the second end plate near the first end plate and is connected to the first battery cell. The other end of the bonding bar in the first direction is located on the side of the second end plate near the third end plate and is connected to the second battery cell. A plurality of first battery cells and a plurality of second battery cells are connected in series through the bonding bar.

[0014] On the other hand, this application provides a battery pack, including: At least one of the aforementioned battery modules; The battery module is housed and fixed within the housing.

[0015] In one possible implementation, a mounting strip is provided on the bottom wall of the housing, and the second end plate is mounted on the side of the mounting strip away from the bottom wall of the housing. The mounting strip is located between a plurality of first cells and a plurality of second cells in the first direction.

[0016] Furthermore, this application provides an electrical appliance, comprising: The aforementioned battery pack.

[0017] The battery module, battery pack, and electrical equipment provided in this application, on the one hand, involve multiple first cells fixedly disposed between a first end plate and a second end plate, and multiple second cells fixedly disposed between a second end plate and a third end plate. Only one end plate is required between the multiple first and second cells, eliminating the need for two end plates. This allows the battery module to be made smaller along the first direction, reducing its weight and increasing its energy density. On the other hand, the first and second end plates, which can fix multiple first cells, and the second and third end plates, which can fix multiple second cells, improve the battery module's resistance to deformation when the first and second cells deform, thus ensuring the overall stability of the battery module. Furthermore, because the mounting holes on the second end plate are larger along the first direction than along the third direction, even if the second end plate deviates in the first direction during battery module installation, the mounting holes can still mate with components inside the casing to fix the second end plate to the casing. This improves the success rate of installation of the second end plate and the battery module and increases assembly efficiency. Therefore, the battery module, battery pack and electrical equipment provided in this application can improve the assembly efficiency of battery module into the box while ensuring the deformation resistance and energy density of the battery module. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are merely some implementation methods provided by the embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of an electrical device provided in one embodiment of this application; Figure 2 This is a schematic diagram of a battery pack provided in one embodiment of this application; Figure 3 This is an assembly structure diagram of a battery module provided in one embodiment of this application; Figure 4 yes Figure 3 A top view of the battery module shown; Figure 5 yes Figure 3 The left view of the battery module shown; Figure 6 This is a partially exploded structural diagram of a battery module provided in one embodiment of this application; Figure 7 This is a structural diagram of a second end plate provided in one embodiment of this application; Figure 8 yes Figure 7 The top view of the second end plate shown; Figure 9 This is a structural diagram of a heat insulation pad and a cushioning pad provided in an embodiment of this application; Figure 10 yes Figure 9 The front view of the insulation pad and cushioning pad shown.

[0020] Explanation of icon numbers: Electrical equipment-1000, battery pack-100, load device-200, battery module-101, housing-102, first mounting strip-1021, second mounting strip-1022, third mounting strip-1023, first end plate-11, second end plate-12, mounting hole-121, first hole-1211, second hole-1212, third end plate-13, first battery cell-21, second battery cell-22, heat insulation pad-31 , Buffer pad-32, First buffer pad-321, Second buffer pad-322, First fixing strap-41, Second fixing strap-42, First connecting strip-51, Second connecting strip-52, Overlap strip-53, First output component-54, Second output component-55, First fixing seat-61, Second fixing seat-62, First insulating sheet-71, Second insulating sheet-72, Third insulating sheet-73, Fourth insulating sheet-74, Slot-80. Detailed Implementation

[0021] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0022] The following descriptions of the embodiments are based on the accompanying drawings and are used to illustrate specific embodiments in which this application can be implemented. Directional terms used in the description of this application, such as "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "top surface," "side surface," "bottom surface," "top wall," "side wall," "bottom wall," "inner side wall," "outer side wall," "length direction," "width direction," and "height direction," are merely for reference to the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of this application, and do not indicate or imply that the referred device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In the description of this application, terms such as "first," "second," "third," and "fourth" are only used to distinguish the described objects and do not have any sequential or technical meaning. In the description of this application, the terms "connection" and "linkage," unless otherwise specified, include both direct connection (linkage) and indirect connection (linkage). It should be understood that in the description of this application, the first direction is the length direction of the battery module (as shown by the X-axis in the figure), the second direction is the height direction of the battery module (as shown by the Z-axis in the figure), and the third direction is the width direction of the battery module (as shown by the Y-axis in the figure).

[0023] Please see Figure 1 , Figure 1 This is a schematic diagram of an electrical device provided in one embodiment of this application.

[0024] This application provides an electrical device 1000, which includes a battery pack 100 and a load device 200. The battery pack 100 and the load device 200 are electrically connected to supply power to the load device 200, thereby enabling the load device 200 to operate.

[0025] The electrical equipment 1000 provided in this application includes, but is not limited to, mobile power supplies, electric vehicles, electric aircraft, electric ships, household appliances, energy storage systems, medical equipment, aerospace equipment, robots, etc., and this application does not impose any restrictions on them.

[0026] Please see Figure 1 and Figure 2 , Figure 2 This is a schematic diagram of a battery pack provided in one embodiment of this application.

[0027] This application provides a battery pack 100 for use in the aforementioned electrical device 1000 to provide electrical energy to the load device 200 of the electrical device 1000. In one embodiment, the battery pack 100 includes at least one battery module 101 and a housing 102, wherein the battery module 101 is housed and fixed within the housing 102. The battery module 101 serves as the power source for the battery pack 100, enabling the battery pack to provide electrical energy to the load device 200 of the electrical device 1000.

[0028] In one specific embodiment, a first mounting strip 1021 is provided on the bottom wall of the housing 102, and the first mounting strip 1021 is fixedly disposed on the bottom wall of the housing 102. The battery module 101 is detachably mounted on the side of the first mounting strip 1021 away from the bottom wall of the housing 102, and at least a portion of the side of the first mounting strip 1021 away from the bottom wall of the housing 102 is embedded in the battery module 101. Thus, by fixing the first mounting strip 1021 to the bottom wall of the housing 102, and by embedding at least a portion of the side of the first mounting strip 1021 away from the bottom wall of the housing 102 in the battery module 101, the overall height of the battery module 101 after installation in the housing 102 is smaller, which helps to reduce the overall size of the battery pack 100, thereby increasing the energy density of the battery pack 100.

[0029] In one specific embodiment, the battery module 101 extends along a first direction, and a second mounting strip 1022 and a third mounting strip 1023 are further provided on the bottom wall of the housing 102. The second mounting strip 1022 and the third mounting strip 1023 are both fixedly disposed on the bottom wall of the housing 102, and the first mounting strip 1021, the second mounting strip 1022 and the third mounting strip 1023 are arranged sequentially at intervals along the first direction. At least a portion of the side of the second mounting strip 1022 away from the bottom wall of the housing 102 and at least a portion of the side of the third mounting strip 1023 away from the bottom wall of the housing 102 are embedded in the battery module 101. Therefore, since the second mounting strip 1022 and the third mounting strip 1023 are both fixedly disposed on the bottom wall of the housing 102, at least a portion of the second mounting strip 1022 on the side away from the bottom wall of the housing 102 and at least a portion of the third mounting strip 1023 on the side away from the bottom wall of the housing 102 are embedded in the battery module 101, so that the battery module 101 can be positioned by the second mounting strip 1022 and the third mounting strip 1023 during the installation process in the housing 102, which helps to improve the stability of the battery module 101 installed in the housing 102, thereby improving the stability of the battery pack 100.

[0030] Please see Figures 2 to 6 , Figure 3This is an assembly structure diagram of a battery module provided in one embodiment of this application. Figure 4 yes Figure 3 The top view of the battery module shown. Figure 5 yes Figure 3 The left view of the battery module shown. Figure 6 This is a partially exploded structural diagram of a battery module provided in one embodiment of this application.

[0031] This application provides a battery module 101 for use in the aforementioned battery pack 100. The battery module 101 includes a first end plate 11, a second end plate 12, a third end plate 13, a plurality of first battery cells 21, and a plurality of second battery cells 22. The first end plate 11 and the third end plate 13 are fixedly disposed relative to each other. In this embodiment, the first end plate 11, the second end plate 12, and the third end plate 13 are all fixedly disposed within a housing 102. The first end plate 11, the second end plate 12, and the third end plate 13 are sequentially spaced along a first direction; that is, the first end plate 11 is located on one side of the second end plate 12 and is spaced apart from the second end plate 12 along the first direction, and the third end plate 13 is located on the other side of the second end plate 12 and is spaced apart from the second end plate 12 along the first direction. The plurality of first battery cells 21 are connected in series and arranged sequentially along the first direction, and the plurality of first battery cells 21 are fixedly disposed between the first end plate 11 and the second end plate 12. Multiple second battery cells 22 are connected in series and arranged sequentially along a first direction, and are fixedly disposed between a second end plate 12 and a third end plate 13. The second end plate 12 has a through-hole 121 along a second direction, which allows the second end plate 12 to be fixed within the housing 102. The through-hole 121 is oblong, meaning its dimension along the first direction is larger than its dimension along the third direction. The first direction is the length direction of the battery module 101, the second direction is the height direction of the battery module 101, and the third direction is the width direction of the battery module 101. The first, second, and third directions are perpendicular to each other.

[0032] The battery module 101 provided in this application, on the one hand, has multiple first cells 21 fixedly disposed between a first end plate 11 and a second end plate 12, and multiple second cells 22 fixedly disposed between a second end plate 12 and a third end plate 13. Only one end plate is provided between the multiple first cells 21 and the multiple second cells 22, eliminating the need for two end plates. This allows the battery module 101 to be made smaller along the first direction, which helps reduce the weight of the battery module 101 and increase its energy density. On the other hand, the first end plate 11 and the second end plate 12 can fix the multiple first cells 21, and the second end plate 12 and the third end plate 13 can fix the multiple second cells 22. This helps improve the deformation resistance of the battery module 101 when the first cells 21 and the second cells 22 deform, thereby ensuring the overall stability of the battery module 101. Furthermore, since the dimension of the mounting hole 121 on the second end plate 12 along the first direction is larger than the dimension of the mounting hole 121 along the third direction, when the battery module 101 is installed in the housing 102, even if there is a positional deviation of the second end plate 12 in the first direction, the mounting hole 121 can still cooperate with the components inside the housing 102 to fix the second end plate 12 to the housing 102. This helps to improve the success rate and assembly efficiency of installing the second end plate 12 and the battery module 101 into the housing 102. Therefore, the battery module 101 provided in this application can improve the assembly efficiency of the battery module 101 into the housing while ensuring the deformation resistance and energy density of the battery module 101.

[0033] Please see Figures 2 to 6 In one embodiment, the second end plate 12 is fixed inside the housing 102 by screws passing through the mounting holes 121. It should be understood that during the process of installing the battery module 101 of the battery pack 100 into the housing 102, due to the unavoidable dimensional errors of the first cell 21 and the second cell 22 in the first direction, a deviation may easily occur between the second end plate 12 of the battery module 101 and the first mounting strip 1021 of the housing 102, causing the screws to be unable to pass through the mounting holes 121, thereby affecting the assembly efficiency of installing the battery module 101 into the housing 102 to form the battery pack 100. In this embodiment, since the size of the mounting hole 121 on the second end plate 12 along the first direction is larger than the size of the mounting hole 121 along the third direction, when the battery module 101 is installed in the housing 102, even if there is a positional deviation of the second end plate 12 in the first direction, the mounting hole 121 can still cooperate with the screw to fix the second end plate 12 to the housing 102. This helps to improve the success rate and assembly efficiency of installing the second end plate 12 and the battery module 101 in the housing 102.

[0034] Please see Figures 2 to 8 , Figure 7This is a structural diagram of a second end plate provided in one embodiment of this application. Figure 8 yes Figure 7 The top view of the second end plate shown.

[0035] In one specific embodiment, the mounting holes 121 on the second end plate 12 include a first hole 1211 and a second hole 1212. Both the first hole 1211 and the second hole 1212 are used for screws to pass through, so as to fix the second end plate 12 into the housing 102. The first hole 1211 and the second hole 1212 both penetrate the second end plate 12 along a second direction, and the first hole 1211 and the second hole 1212 are spaced apart along a third direction. The dimension of the first hole 1211 along the first direction is larger than the dimension of the first hole 1211 along the third direction, and the dimension of the second hole 1212 along the first direction is larger than the dimension of the second hole 1212 along the third direction.

[0036] The battery module 101 provided in this embodiment uses both the first hole 1211 and the second hole 1212 for screws to pass through, so as to fix the second end plate 12 inside the housing 102. This helps to improve the stability of the second end plate 12 and the battery module 101 inside the housing 102, and facilitates the transportation of the battery pack 100 formed by the battery module 101. Moreover, the dimension of the first hole 1211 along the first direction is larger than the dimension of the first hole 1211 along the third direction, and the dimension of the second hole 1212 along the first direction is larger than the dimension of the second hole 1212 along the third direction. When the battery module 101 is installed in the housing 102, if there is a deviation in the position of the second end plate 12 in the first direction, the first hole 1211 and the second hole 1212 can still cooperate with the corresponding screws to fix the second end plate 12 to the housing 102. This helps to improve the success rate and assembly efficiency of installing the second end plate 12 and the battery module 101 into the housing 102.

[0037] Please see Figures 2 to 8 In one specific embodiment, the first hole 1211 is disposed near the second end plate 12 on one side along a third direction, and the second hole 1212 is disposed near the second end plate 12 on the other side along a third direction. That is, the first hole 1211 and the second hole 1212 are disposed on opposite sides of the second end plate 12 in the third direction. Compared to the first hole 1211 and the second hole 1212 being disposed close together, in this embodiment the first hole 1211 and the second hole 1212 are disposed far apart, which is beneficial to improving the stability of the second end plate 12 within the housing 102. For example, the dimensions of the first hole 1211 and the second hole 1212 along the first direction are 22 mm, and the dimensions of the first hole 1211 and the second hole 1212 along the third direction are 9 mm. It is understood that the dimensions of the first hole 1211 and the second hole 1212 can be adjusted as needed, as long as there is sufficient assembly space for the screws in the first hole 1211 and the second hole 1212 along the first direction.

[0038] Please see Figures 2 to 6 , Figure 9 and Figure 10 , Figure 9 This is a structural diagram of a heat insulation pad and a cushioning pad provided in an embodiment of this application. Figure 10 yes Figure 9 The front view of the insulation pad and cushioning pad shown.

[0039] In one embodiment, the battery module 101 further includes a plurality of heat insulation pads 31 and a plurality of buffer pads 32. In a first direction, a heat insulation pad 31 and a buffer pad 32 are disposed between any two adjacent first cells 21 and between any two adjacent second cells 22. The projections of the heat insulation pads 31 and buffer pads 32 between any two adjacent first cells 21 and between any two adjacent second cells 22 in the first direction do not coincide, and the thickness of the buffer pads 32 in the first direction is greater than the thickness of the heat insulation pads 31 in the first direction.

[0040] In this embodiment, the battery module 101 has a relatively large contact force between the multiple first cells 21 and the multiple second cells 22 to ensure the overall deformation resistance of the battery module 101. Simultaneously, to achieve heat insulation, a heat insulation pad 31 is provided between any two adjacent first cells 21 and any two adjacent second cells 22 to reduce the thermal impact between the cells. A heat insulation pad 31 and a buffer pad 32 are provided between any two adjacent first cells 21 and any two adjacent second cells 22, and the projections of the heat insulation pad 31 and the buffer pad 32 in the first direction do not coincide. The thickness of the buffer pad 32 in the first direction is greater than the thickness of the heat insulation pad 31 in the first direction. On the one hand, the buffer pad 32 can further fill the gaps between adjacent first cells 21 and adjacent second cells 22 to provide cushioning and support for the multiple first cells 21 and multiple second cells 22, thereby increasing the preload of the battery module 101 and preventing the battery module 101 from becoming loose. On the other hand, the buffer pad 32 can reduce the impact of thickness deviations (errors in the manufacturing process of the multiple first cells 21 or multiple second cells 22) on the length of the battery module 101. The buffer pad 32 can also absorb the expansion force generated by the deformation of the multiple first cells 21 or multiple second cells 22, thereby reducing the risk that the battery module 101 will deform and fail to be installed in the housing 102 of the battery pack 100 or will fail. Furthermore, it can prevent the heat insulation pad 31 from being damaged due to direct contact between two adjacent first cells 21 or two adjacent second cells 22, thereby ensuring the heat insulation effect of the heat insulation pad 31 on the multiple first cells 21 and multiple second cells 22, and effectively preventing the occurrence of heat propagation.

[0041] Please see Figures 2 to 6 , Figure 9 and Figure 10 In this embodiment, the heat insulation pad 31 is made of nanoporous heat insulation material, and the buffer pad 32 has a foaming rate of 10 times. The buffer pad 32 is made of XPE or TPU material, so that the buffer pad 32 can absorb the thickness of a larger area of ​​multiple first battery cells 21 or multiple second battery cells 22, providing support and cushioning for the multiple first battery cells 21 and multiple second battery cells 22. It is understood that in some other embodiments, the material of the heat insulation pad 31 can also be other heat insulation materials, and the foaming rate of the buffer pad 32 can be 8 times, 12 times, etc. The material of the buffer pad 32 can also be other cushioning materials, and this application does not limit this.

[0042] Please see Figures 2 to 6 , Figure 9 and Figure 10 In one specific embodiment, the buffer pad 32 includes a first buffer pad 321 and a second buffer pad 322. The first buffer pad 321 is disposed on one side of the heat insulation pad 31 along a second direction, and the thickness of the first buffer pad 321 in the first direction is greater than the thickness of the heat insulation pad 31 in the first direction. The second buffer pad 322 is disposed on the other side of the heat insulation pad 31 along the second direction, and the thickness of the second buffer pad 322 in the first direction is greater than the thickness of the heat insulation pad 31 in the first direction. The first buffer pad 321 abuts against one of two adjacent first battery cells 21 or two adjacent second battery cells 22 on one side of the first direction, and the second buffer pad 322 abuts against one of two adjacent first battery cells 21 or two adjacent second battery cells 22 on one side of the first direction, and the second buffer pad 322 abuts against the other of two adjacent first battery cells 21 or two adjacent second battery cells 22 on the other side of the first direction.

[0043] The battery module 101 provided in this embodiment uses a first buffer pad 321, a heat insulation pad 31, and a second buffer pad 322 disposed between any two adjacent first cells 21 or any two adjacent second cells 22. The first buffer pad 321 and the second buffer pad 322 can provide more stable support for any two adjacent first cells 21 or any two adjacent second cells 22, which is beneficial to improving the overall stability of the battery module 101. Moreover, the first buffer pad 321 and the second buffer pad 322 are disposed on opposite sides of the heat insulation pad 31 along the second direction, which can better prevent two adjacent first cells 21 or two adjacent second cells 22 from directly contacting the heat insulation pad 31 and damaging the heat insulation pad 31, thereby ensuring the heat insulation effect of the heat insulation pad 31 on multiple first cells 21 and multiple second cells 22.

[0044] Understandably, in some other embodiments, the first buffer pad 321 and the second buffer pad 322 may be disposed on opposite sides of the heat insulation pad 31 along a third direction. Alternatively, the heat insulation pad 31 may have the first buffer pad 321 and the second buffer pad 322 disposed on opposite sides along a second direction, and the heat insulation pad 31 may also have the first buffer pad 321 and the second buffer pad 322 disposed on opposite sides along a third direction. Alternatively, the buffer pad 32 may be an integral structure in the shape of a "U", and the buffer pad 32 may be disposed around the heat insulation pad 31 in the first direction. All of these configurations can provide stable support for any two adjacent first cells 21 or any two adjacent second cells 22. This application does not impose any limitations on these configurations.

[0045] Please see Figures 2 to 6 , Figure 9 and Figure 10 In a more specific embodiment, the first buffer pad 321 and the second buffer pad 322 are disposed on opposite sides of the heat insulation pad 31 along the second direction, and the first buffer pad 321 is spaced apart from the heat insulation pad 31 in the second direction, and the second buffer pad 322 is spaced apart from the heat insulation pad 31 in the second direction.

[0046] The battery module 101 provided in this embodiment has a first buffer pad 321 spaced apart from the heat insulation pad 31 in the second direction, and a second buffer pad 322 spaced apart from the heat insulation pad 31 in the second direction, so that the first buffer pad 321 and the second buffer pad 322 will not extend to contact the heat insulation pad 31 and cause damage to the heat insulation pad 31 when subjected to the compressive force in the first direction, thereby ensuring the heat insulation effect of the heat insulation pad 31 on the multiple first cells 21 and multiple second cells 22.

[0047] For example, in one assembly configuration of a battery module 101, along the first direction, the gap between two adjacent first cells 21 and two adjacent second cells 22 is 2.5 mm, the thickness of the heat insulation pad 31 is 2 mm, and the thickness of the first buffer pad 321 and the second buffer pad 322 is 5 mm. The first buffer pad 321 and the second buffer pad 322 will deform after being compressed by two adjacent first cells 21 or two adjacent second cells 22, resulting in a thickness less than 5 mm. It is understood that the above dimensional design can be adaptively adjusted as needed, and this application does not impose any limitations on it.

[0048] Please see Figures 2 to 6In one embodiment, the battery module 101 further includes a first fixing band 41, which is fixedly sleeved on the first end plate 11, a plurality of first battery cells 21, a second end plate 12, a plurality of second battery cells 22, and a third end plate 13. Thus, even if the first battery cells 21 or 22 expand and deform, the first fixing band 41 can provide a certain degree of restraint on the battery module 101. In this embodiment, the first fixing band 41 is a steel band. It is understood that in some other embodiments, the first fixing band 41 may be made of other materials, and this application does not limit this.

[0049] The battery module 101 provided in this embodiment is fixedly sleeved on the first end plate 11, multiple first cells 21, the second end plate 12, multiple second cells 22 and the third end plate 13 by the first fixing band 41, so as to improve the overall stability of the battery module 101 and further improve the overall deformation resistance of the battery module 101.

[0050] Please see Figures 2 to 6 In one specific embodiment, the battery module 101 further includes a second fixing band 42, which is fixedly sleeved on the first end plate 11, a plurality of first cells 21, a second end plate 12, a plurality of second cells 22, and a third end plate 13. The second fixing band 42 and the first fixing band 41 are spaced apart along a second direction. Therefore, even if the first cells 21 or the second cells 22 expand and deform, the first fixing band 41 and the second fixing band 42 can simultaneously provide a certain degree of restraint on the battery module 101. In this embodiment, the second fixing band 42 is a steel band. It is understood that in some other embodiments, the second fixing band 42 may be made of other materials, and this application does not limit this.

[0051] The battery module 101 provided in this embodiment is fixedly sleeved on the first end plate 11, multiple first cells 21, the second end plate 12, multiple second cells 22 and the third end plate 13 by both the first fixing strap 41 and the second fixing strap 42, so as to improve the overall stability of the battery module 101 and further improve the overall deformation resistance of the battery module 101.

[0052] Please see Figures 2 to 6 In a more specific embodiment, the first fixing strap 41 and the second fixing strap 42 have equal thicknesses, and the thicknesses of the first fixing strap 41 and the second fixing strap 42 range from [1.2, 1.8] mm. For example, the thicknesses of the first fixing strap 41 and the second fixing strap 42 can both be 1.2 mm, 1.5 mm, 1.6 mm, etc.

[0053] The battery module 101 provided in this embodiment, by limiting the thickness of the first fixing strap 41 and the second fixing strap 42, can prevent insufficient binding force due to the thinness of the first fixing strap 41 and the second fixing strap 42, and can also prevent excessive spacing between adjacent battery modules 101 due to the thickness of the first fixing strap 41 and the second fixing strap 42. Therefore, the battery module 101 provided in this embodiment, while ensuring the binding effect of the first fixing strap 41 and the second fixing strap 42 on the battery module 101, can also improve the energy density of the battery pack 100 formed by the battery modules 101.

[0054] Please see Figures 2 to 6 In one embodiment, the battery module 101 further includes a plurality of first connecting blocks 51 and a plurality of second connecting blocks 52. Any two adjacent first cells 21 are connected in series through a first connecting block 51, and any two adjacent second cells 22 are connected in series through a second connecting block 52. In this embodiment, both the first connecting blocks 51 and the second connecting blocks 52 are aluminum. In some other embodiments, the first connecting blocks 51 and the second connecting blocks 52 may be made of other conductive materials, and this application does not limit this.

[0055] The battery module 101 provided in this embodiment connects any two adjacent first cells 21 in series through a first connecting bar 51, and connects any two adjacent second cells 22 in series through a second connecting bar 52. This eliminates the need for additional wire design, which simplifies the assembly difficulty of the battery module 101 and makes the structure of the battery module 101 simpler.

[0056] Please see Figures 2 to 6 In one embodiment, the battery module 101 further includes a bonding bar 53, which covers at least a portion of the second end plate 12. One end of the bonding bar 53 in a first direction is located on the side of the second end plate 12 near the first end plate 11 and exposes the second end plate 12, and this end of the bonding bar 53 is connected to a first battery cell 21. The other end of the bonding bar 53 in the first direction is located on the side of the second end plate 12 near the third end plate 13 and exposes the second end plate 12, and this end of the bonding bar 53 is connected to a second battery cell 22. In other words, one end of the bonding bar 53 in the first direction is electrically connected to the first battery cell 21 closest to the second end plate 12 among a plurality of first battery cells 21, and the other end of the bonding bar 53 in the first direction is electrically connected to the second battery cell 22 closest to the second end plate 12 among a plurality of second battery cells 22, so that the plurality of first battery cells 21 and the plurality of second battery cells 22 are connected in series through the bonding bar 53. In this embodiment, the bonding bar 53 is an aluminum busbar. In some other embodiments, the overlap strip 53 may be made of other conductive materials, and this application does not limit this.

[0057] The battery module 101 provided in this embodiment is connected in series by multiple first cells 21 and multiple second cells 22 through a connecting strip 53. This eliminates the need for additional wire design, which simplifies the assembly difficulty of the battery module 101 and makes the structure of the battery module 101 simpler.

[0058] Please see Figures 2 to 6 In one embodiment, the battery module 101 further includes a first fixing base 61, a second fixing base 62, a first output component 54, and a second output component 55. The first fixing base 61 is fixed to a first end plate 11. One end of the first output component 54 along a first direction is electrically connected to a first battery cell 21 near the first end plate 11 among a plurality of first battery cells 21, and the other end of the first output component 54 abuts against the first fixing base 61. The second fixing base 62 is fixed to a third end plate 13. One end of the second output component 55 along the first direction is electrically connected to a second battery cell 22 near the third end plate 13 among a plurality of second battery cells 22, and the other end of the second output component 55 abuts against the second fixing base 62. In this embodiment, both the first output component 54 and the second output component 55 are aluminum busbars. In some other embodiments, the first output component 54 and the second output component 55 may be made of other conductive materials, and this application does not impose any limitations on this.

[0059] The battery module 101 provided in this embodiment is electrically connected at one end of the first output component 54 to the first cell 21 near the first end plate 11 among a plurality of first cells 21, and at one end of the second output component 55 to the second cell 22 near the third end plate 13 among a plurality of second cells 22. This eliminates the need for additional wiring, simplifying the assembly of the battery module 101 and making its structure simpler. Furthermore, the fact that the other end of the first output component 54 abuts against the first fixing base 61, and the other end of the second output component 55 abuts against the second fixing base 62, improves the stability of the first and second output components 54 and 55 on the battery module 101, thereby enhancing the output stability of the battery module 101.

[0060] Please see Figures 2 to 6In one embodiment, the battery module 101 further includes a first insulating sheet 71, a second insulating sheet 72, a third insulating sheet 73, and a fourth insulating sheet 74. The first insulating sheet 71 is disposed between the second end plate 12 and a plurality of first battery cells 21, and the first insulating sheet 71 is in contact with the second end plate 12 in a first direction. The second insulating sheet 72 is disposed between the second end plate 12 and a plurality of second battery cells 22, and the second insulating sheet 72 is in contact with the second end plate 12 in a first direction. The third insulating sheet 73 is disposed between the first end plate 11 and a first battery cell 21 closer to the first end plate 11 among the plurality of first battery cells 21. The fourth insulating sheet 74 is disposed between the third end plate 13 and a second battery cell 22 closer to the third end plate 13 among the plurality of second battery cells 22. In this embodiment, the first insulating sheet 71, the second insulating sheet 72, the third insulating sheet 73, and the fourth insulating sheet 74 are all thin films of an alloy material made of polycarbonate and polyester composite. It is understood that in some other embodiments, the first insulating sheet 71, the second insulating sheet 72, the third insulating sheet 73 and the fourth insulating sheet 74 may be insulating sheets made of other materials, and this application does not limit them.

[0061] The battery module 101 provided in this embodiment, through the arrangement of the first insulating sheet 71, the second insulating sheet 72, the third insulating sheet 73 and the fourth insulating sheet 74, forms electrical isolation between the first cell 21 and the second end plate 12 and between the second cell 22 and the second end plate 12. It also forms electrical isolation between the first cell 21 and the first end plate 11 and between the second cell 22 and the third end plate 13. This can reduce the probability of short circuits in the battery module 101 and thus improve the safety of the battery module 101.

[0062] Please see Figures 2 to 6 In one embodiment, a plurality of first cells 21, a second end plate 12, and a plurality of second cells 22 of the battery module 101 are arranged to form a slot 80, which is used to provide positioning during the installation of the battery module 101. When the battery module 101 is installed inside the housing 102, the second end plate 12 is detachably mounted to the side of the housing 102 away from the bottom wall of the housing 102, and the first mounting strip 1021 of the housing 102 is embedded within the slot 80 formed by the plurality of first cells 21, the second end plate 12, and the plurality of second cells 22, such that the first mounting strip 1021 is positioned in a first direction between the plurality of first cells 21 and the plurality of second cells 22.

[0063] The battery module 101 provided in this embodiment is embedded in the slot 80 formed by multiple first cells 21, second end plate 12 and multiple second cells 22 through the first mounting strip 1021 of the housing 102, so that the overall height of the battery module 101 after installation in the housing 102 is small, which is beneficial to reduce the overall size of the battery pack 100 and thus improve the energy density of the battery pack 100.

[0064] Understandably, for the second mounting strip 1022 and the third mounting strip 1023 on the bottom wall of the housing 102, the first end plate 11 is detachably mounted on the side of the second mounting strip 1022 away from the bottom wall of the housing 102, and the third end plate 13 is detachably mounted on the side of the third mounting strip 1023 away from the bottom wall of the housing 102. At least a portion of the plurality of first cells 21 are disposed between the first mounting strip 1021 and the second mounting strip 1022, and at least a portion of the plurality of second cells 22 are disposed between the second mounting strip 1022 and the third mounting strip 1023. Thus, during the installation of the battery module 101 in the housing 102, it can be positioned by the second mounting strip 1022 and the third mounting strip 1023, which helps to improve the stability of the battery module 101 during installation in the housing 102, thereby improving the stability of the battery pack 100.

[0065] Please see Figures 2 to 6In this embodiment, there are 13 first battery cells 21, which are connected in series along a first direction. There are also 13 second battery cells 22, which are connected in series along the first direction. There are 24 heat insulation pads 31, with 12 heat insulation pads between each of the 13 first battery cells 21, and one heat insulation pad between any two adjacent first battery cells 21. Similarly, there are 24 first buffer pads 321, with 12 first buffer pads between each of the 13 first battery cells 21, and one first buffer pad between any two adjacent first battery cells 21. There are 24 second buffer pads 322. Twelve second buffer pads 322 are placed between the 13 first cells 21, and one second buffer pad 322 is placed between any two adjacent first cells 21. Similarly, twelve second buffer pads 322 are placed between the 13 second cells 22, and one second buffer pad 322 is placed between any two adjacent second cells 22. There are twelve first connecting bars 51, and the 13 first cells 21 are connected in series through these twelve first connecting bars 51. There are twelve second connecting bars 52, and the 13 second cells 22 are connected in series through these twelve second connecting bars 52. Understandably, in some other embodiments, the number of first battery cells 21 can be 10, 11, 12, 14, etc., and the number of second battery cells 22 can be 10, 11, 12, 14, etc. The corresponding number of heat insulation pads 31, first buffer pads 321, second buffer pads 322, first connecting strips 51 and second connecting strips 52 can be set according to the number of first battery cells 21 and second battery cells 22. This application does not limit this.

[0066] The above are some embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

Claims

1. A battery module (101), characterized by include: First end plate (11); The second end plate (12) is spaced apart from the first end plate (11) along a first direction; Multiple first cells (21) are disposed between the first end plate (11) and the second end plate (12) and arranged along the first direction; The third end plate (13) is disposed on the side of the second end plate (12) away from the first end plate (11) and spaced apart from the second end plate (12) along the first direction. The third end plate (13) is fixed relative to the first end plate (11). Multiple second cells (22) are disposed between the second end plate (12) and the third end plate (13) and arranged along the first direction; The second end plate (12) has a mounting hole (121) that extends through the second direction. The size of the mounting hole (121) along the first direction is greater than the size of the mounting hole (121) along the third direction. The first direction, the second direction and the third direction are perpendicular to each other.

2. The battery module (101) as described in claim 1, characterized in that, The mounting hole (121) includes a first hole (1211) and a second hole (1212), the first hole (1211) and the second hole (1212) being spaced apart along the third direction; the dimension of the first hole (1211) along the first direction is greater than the dimension of the second hole (1211) along the third direction, and the dimension of the second hole (1212) along the first direction is greater than the dimension of the second hole (1212) along the third direction.

3. The battery module (101) as described in claim 2, characterized in that, The first hole (1211) is disposed on one side of the second end plate (12) along the third direction, and the second hole is disposed on the other side of the second end plate (12) along the third direction.

4. The battery module (101) as described in any one of claims 1 to 3, characterized in that, The battery module (101) also includes multiple heat insulation pads (31) and multiple buffer pads (32). In the first direction, a heat insulation pad (31) and a buffer pad (32) are provided between any two adjacent first cells (21) and between any two adjacent second cells (22). The projections of the heat insulation pad (31) and the buffer pad (32) between any two adjacent first cells (21) and between any two adjacent second cells (22) in the first direction do not coincide. The thickness of the buffer pad (32) in the first direction is greater than the thickness of the heat insulation pad (31) in the first direction.

5. The battery module (101) as described in claim 4, characterized in that, The buffer pad (32) includes a first buffer pad (321) and a second buffer pad (322); the first buffer pad (321) is disposed on one side of the heat insulation pad (31) along the second direction, and the thickness of the first buffer pad (321) in the first direction is greater than the thickness of the heat insulation pad (31) in the first direction; the second buffer pad (322) is disposed on the other side of the heat insulation pad (31) along the second direction, and the thickness of the second buffer pad (322) in the first direction is greater than the thickness of the heat insulation pad (31) in the first direction.

6. The battery module (101) as described in claim 5, characterized in that, The first buffer pad (321) and the heat insulation pad (31) are spaced apart in the second direction, and the second buffer pad (322) and the heat insulation pad (31) are spaced apart in the second direction.

7. The battery module (101) as described in any one of claims 1 to 6, characterized in that, The battery module (101) further includes a first fixing band (41) and a second fixing band (42). The first fixing band (41) is fixedly sleeved on the first end plate (11), the plurality of first cells (21), the second end plate (12), the plurality of second cells (22), and the third end plate (13). The second fixing band (42) is fixedly sleeved on the first end plate (11), the plurality of first cells (21), the second end plate (12), the plurality of second cells (22), and the third end plate (13). The second fixing band (42) and the first fixing band (41) are spaced apart along the second direction.

8. The battery module (101) as described in claim 7, characterized in that, The first fixing band (41) and the second fixing band (42) have the same thickness, and the thickness of the first fixing band (41) and the second fixing band (42) ranges from [1.2, 1.8] mm.

9. The battery module (101) as described in claim 1, characterized in that, A plurality of first cells (21), a second end plate (12) and a plurality of second cells (22) are arranged to form a slot (80).

10. The battery module (101) as described in claim 1, characterized in that, The battery module (101) further includes a connecting strip (53) which covers at least a portion of the second end plate (12). One end of the connecting strip (53) in the first direction is located on the side of the second end plate (12) near the first end plate (11) and connected to the first battery cell (21). The other end of the connecting strip (53) in the first direction is located on the side of the second end plate (12) near the third end plate (13) and connected to the second battery cell (22). A plurality of first battery cells (21) and a plurality of second battery cells (22) are connected in series through the connecting strip (53).

11. A battery pack (100) characterized by, include: At least one battery module (101) as described in any one of claims 1 to 10. The battery module (101) is housed and fixed inside the housing (102); An mounting strip is provided on the bottom wall of the housing (102), and the second end plate (12) is installed on the side of the mounting strip away from the bottom wall of the housing (102). The mounting strip is located between a plurality of first cells (21) and a plurality of second cells (22) in the first direction.

12. An electric device (1000) characterized in that, include: The battery pack (100) as described in claim 11.

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