Battery module and battery pack

Abstract

The utility model provides a battery module and a battery pack, and relates to the technical field of batteries. The battery module in the embodiment of the utility model comprises a shell, a heat dissipation plate and a plurality of battery cells, the heat dissipation plate and the plurality of battery cells are arranged in the shell; the plurality of battery cells are stacked along the length direction of the shell; the heat dissipation plate is arranged between two adjacent battery cells and / or the heat dissipation plate is arranged between the battery cells and the shell. According to the battery module, the heat dissipation plates are arranged between the two adjacent battery cells and / or between the battery cells and the shell, and heat transfer in the battery module is accelerated through the heat dissipation plates, so that the temperature stability of the battery module is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery module and a battery pack. BACKGROUND

[0002] With the rapid development of the global new energy market and the continuous enhancement of environmental awareness, lithium batteries, as a kind of efficient and environmentally friendly new energy, have gradually become a hot topic. Lithium battery systems have been widely used in electric vehicles, energy storage systems, smart homes, unmanned aerial vehicles and other fields. The lithium battery module is one of the important components of the lithium battery system.

[0003] The lithium battery module has a serious heating problem during operation. In the related art, a cooling pipe system (such as a cooling water circulation pipe) is additionally provided to cool the battery, so that the battery has a relatively low working temperature. However, it has the problems of complex structure, low assembly efficiency, large volume expansion and large weight. CONTENT OF THE INVENTION

[0004] The present application provides a battery module and a battery pack, aiming to improve at least one of the above technical problems.

[0005] In one aspect, the present application provides a battery module, which comprises a shell, a heat dissipation plate and a plurality of battery cells.

[0006] The heat dissipation plate and the plurality of battery cells are arranged in the shell.

[0007] The plurality of battery cells are stacked along the length direction of the battery module.

[0008] The heat dissipation plate is arranged between two adjacent battery cells and / or the heat dissipation plate is arranged between the battery cell and the shell.

[0009] In some embodiments of the present application, the battery module further comprises a buffer plate arranged between the heat dissipation plate and the battery cell and / or arranged between the battery cell and the shell.

[0010] In some embodiments of the present application, the shell comprises a first plate body, the first plate body is provided with a first sealed cavity for accommodating a phase change material, the side of the first plate body facing the battery cell is provided with a plurality of grooves, and the grooves cooperate with one end of the battery cell in the width direction to limit the battery cell.

[0011] In some embodiments of the present application, the shape of one end of the battery cell in the width direction is adapted to the shape of the groove; and / or

[0012] The melting point of the phase change material is 30-80℃; and / or

[0013] an end of the battery cell in the width direction is square, and the groove is square; and / or

[0014] all of the end of the battery cell in the width direction is located in the groove; and / or

[0015] a length of the end of the battery cell close to the groove is L1, a length of the part of the battery cell located in the groove is L2, and L2 / L1 is not less than 0.8; and / or

[0016] the first plate body is an aluminum alloy plate.

[0017] In some embodiments of the present application, a plurality of grooves are arranged along the length direction of the battery module, and a plurality of grooves and a plurality of battery cells are arranged one by one; and / or

[0018] the shell comprises a pair of first plate bodies, a pair of first plate bodies are arranged opposite along the width direction of the battery module, a plurality of battery cells are arranged between a pair of first plate bodies, and two ends of the battery cell in the width direction are matched with the grooves on a pair of first plate bodies, respectively; and / or

[0019] a heat conduction layer is arranged between the battery cell and the first plate body; and / or

[0020] the first sealing cavity comprises a plurality of first sub-cavities, a plurality of first sub-cavities are distributed along the length direction of the battery module, and each first sub-cavity extends along the height direction of the battery module; and / or

[0021] along the length direction of the battery module, at least part of the first sub-cavities are arranged corresponding to two adjacent grooves.

[0022] In some embodiments of the present application, the shell further comprises a pair of second plate bodies, a pair of second plate bodies are arranged opposite along the length direction of the battery module, a plurality of battery cells are arranged between a pair of second plate bodies, the first plate body is arranged between a pair of second plate bodies, and two ends of the first plate body in the width direction are connected with a pair of second plate bodies, respectively.

[0023] In some embodiments of the present application, a second sealing cavity is arranged in the second plate body, and the second sealing cavity is used for accommodating phase change material; and / or

[0024] a second sealing cavity is arranged in the second plate body, the second sealing cavity comprises a plurality of second sub-cavities, at least part of the second sub-cavities are used for accommodating phase change material, a plurality of second sub-cavities are distributed along the height direction of the battery module, and each second sub-cavity extends along the width direction of the battery module.

[0025] In some embodiments of the present application, the battery module further comprises a connecting plate, the tabs of the plurality of battery cells are arranged on the same side; the connecting plate is arranged on the same side of the battery cells, and the connecting plate is electrically connected to the adjacent two battery cells through the tabs.

[0026] In some embodiments of the present application, the connecting plate has a first opening and a second opening arranged at intervals, and the adjacent two battery cells comprise a first battery cell and a second battery cell, the first tab of the first battery cell is located in the first opening, and the second tab of the second battery cell is located in the second opening, and the first tab and the second tab are electrically connected through the connecting plate.

[0027] The second aspect of the present application provides a battery pack, which comprises the battery module.

[0028] Advantages:

[0029] The battery module in the embodiments of the present application comprises a shell, a heat dissipation plate and a plurality of battery cells; the heat dissipation plate and the plurality of battery cells are arranged in the shell; the plurality of battery cells are stacked along the length direction of the battery module; the heat dissipation plate is arranged between the adjacent two battery cells and / or the heat dissipation plate is arranged between the battery cell and the shell. In the present application, the heat dissipation plate is arranged between the adjacent two battery cells and / or between the battery cell and the shell, which accelerates the heat transfer inside the battery module through the heat dissipation plate, thereby improving the temperature stability of the battery module. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0031] Figure 1 is a structural schematic diagram of one embodiment of the battery module provided by the present application;

[0032] Figure 2 is Figure 1 is a top view of the battery module provided in the present application;

[0033] Figure 3 is Figure 1 is a partial exploded structural schematic diagram of the battery module provided in the present application;

[0034] Figure 4 is a structural schematic diagram of one embodiment of the first plate provided by the present application;

[0035] Figure 5 is Figure 1 is a top view of the first plate provided in the present application;

[0036] Figure 6 is a partial explosion structure schematic diagram of another embodiment of the battery module provided by the embodiment of the present application;

[0037] Figure 7 is a structure schematic diagram of another embodiment of the battery module provided by the embodiment of the present application;

[0038] Figure 8 is a structure schematic diagram of one embodiment of the connecting plate provided by the embodiment of the present application;

[0039] Figure 9 is Figure 8 a top view of the connecting plate shown in the figure;

[0040] Figure 10 is a structure schematic diagram of another embodiment of the connecting plate provided by the embodiment of the present application. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0042] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0043] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0044] In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration." Any implementation described as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations. The following description is presented to enable any person skilled in the art to make and use the application. Details are set forth in the following description for purpose of explanation. It should be appreciated that one of ordinary skill in the art will realize that the application can be practiced without the use of these specific details. In other instances, well-known structures and processes are not elaborated as they would be appreciated reported by those with ordinary skill in the art. Thus, the present application is not intended to be limited by the

[0045] With the rapid development of global new energy market and the continuous enhancement of environmental awareness, lithium batteries as a kind of efficient and environmentally friendly new energy have gradually become a hot topic. Lithium battery systems have been widely used in electric vehicles, energy storage systems, smart homes, unmanned aerial vehicles and other fields. Lithium battery module is one of the important components of lithium battery system. Lithium battery module has a serious heating problem in the working process. In the related technology, a cooling pipe system (such as a cooling water circulation pipeline) is additionally provided to cool the battery, so that the battery has a relatively low working temperature, but it has the problems of complex structure, low assembly efficiency, large volume expansion and large weight.

[0046] In view of this, the embodiments of the present application provide a battery module, which has the advantages of simple structure, high assembly efficiency, light weight, stable working temperature and small volume expansion.

[0047] Referring to Figures 1 to 10 The embodiments of the present application provide a battery module 100, which includes a shell 10 and a plurality of battery cells 20, and the plurality of battery cells 20 are arranged in the shell 10. Exemplarily, the plurality of battery cells 20 in the embodiments of the present application are used for storing or releasing electric energy. The shell 10 is used for providing a mounting space and protecting the plurality of battery cells 20 mounted therein.

[0048] Referring to Figure 1 and Figure 2 In the embodiments of the present application, the plurality of battery cells 20 are stacked along the length direction F1 of the shell 10 (i.e. the length direction of the battery module 100). Exemplarily, the battery cell 20 can be a square battery cell or a soft package battery cell, which is not limited here. Unless otherwise specified, the length direction F1 of the shell 10 is also the length direction of the battery module 100. The width direction F2 of the shell 10 is also the length direction of the battery module 100.

[0049] For the convenience of processing and improving the space utilization, each battery cell 20 is generally in a square structure, and each battery cell 20 is identical or similar in shape and size, and the mounting space in the shell 10 is adapted to the size and shape of the plurality of battery cells 20. The thickness direction of each battery cell 20 (i.e., the length direction F1 of the shell 10 or the battery module 100) is parallel to the horizontal direction. The largest surface of each battery cell 20 is perpendicular to the length direction of the battery module 100, and the plurality of battery cells 20 are stacked along the length direction of the battery module 100, which can also be understood as the plurality of battery cells 20 are stacked along the thickness direction thereof.

[0050] In the embodiments of the present application, referring to Figures 3 to 5 , the shell 10 comprises a first plate body 11, and the first plate body 11 is provided with a first sealed cavity 111 for accommodating a phase change material. The side of the first plate body 11 facing the battery cell 20 is provided with a plurality of grooves 112. The groove 112 is arranged opposite to at least one battery cell 20, and cooperates with the end 23 of the opposite battery cell 20 in the width direction to limit the battery cell 20. For example, the groove 112 accommodates the end 23 of the opposite battery cell in the width direction and limits the battery cell 20, that is, the end 23 of the battery cell 20 in the width direction extends into the opposite groove 112, and the groove 112 can limit the battery cell 20 located in it. Specifically, the groove 112 is clamped with the end 23 of the opposite battery cell 20 in the width direction to limit the battery cell 20.

[0051] It should be noted that the groove 112 is arranged opposite to at least one battery cell 20, which means that one groove 112 can be arranged opposite to one battery cell 20, that is, the groove 112 is arranged opposite to the battery cell 20 one by one. Of course, one groove 112 can also be arranged opposite to a plurality of battery cells 20 (for example, two or three, etc.), which is not limited herein.

[0052] As shown in Figure 1 and Figure 2 , the width direction of the battery cell is also the width direction F2 of the shell 10. The end 23 of the width direction of the battery cell can also be understood as the end of the battery cell facing the first plate body 11. The number of the first plate body 11 in the present application can be one or more (for example, two), which is not limited herein.

[0053] It can be understood that, by arranging the first sealed cavity 111 on the shell 10 of the battery module 100 in the present application, the first sealed cavity 111 is used to accommodate the phase change material, which is advantageous to reduce the weight of the shell 10 compared with the prior art scheme of arranging the cooling water pipeline on the shell 10, thereby reducing the weight of the battery module 100 in the present application. At the same time, the phase change material in the present application can absorb a large amount of heat to reduce the temperature of the battery when the temperature of the battery cell 20 is relatively high, and release a large amount of heat to increase the temperature of the battery cell 20 when the temperature of the battery cell 20 is relatively low, so that the battery cell 20 in the shell 10 in the present application has a relatively stable working temperature.

[0054] At the same time, the present application further arranges a plurality of grooves 112 on the side of the first plate body 11 facing the battery cell 20, which increases the strength of the first plate body 11 and further reduces the weight of the plate body. The groove 112 cooperates with one end of the battery cell 20 in the width direction, and the battery cell 20 is limited by the groove 112, which is advantageous to improve the assembly efficiency and accuracy of the battery cell 20.

[0055] In addition, it should be noted that in the related art, a predetermined pressure is generally applied to the front surface of the battery cell 20 (i.e. the largest surface of the battery cell 20) to avoid expansion and deformation of the battery cell 20, and the position close to the side surface of the battery cell 20 (for example, the end in the width direction of the battery cell 20) is almost not subjected to the pre-pressure, which leads to the problem of easy deformation. Compared with the related art, the present application arranges the first sealed cavity 111 in the first plate body 11, the first sealed cavity 111 is used to accommodate the phase change material, and the grooves 112 are arranged on the side of the first plate body 11 facing the battery cell 20, so that one end of the battery cell 20 located in the groove 112 (i.e. one end of the battery cell 20 in the width direction) is closer to the first sealed cavity 111 than other regions of the battery cell 20, and has better temperature stability during the working process of the battery cell 20, and the battery cell 20 is limited by the groove 112, thereby being advantageous and reducing the deformation amount of the end of the battery cell 20 in the width direction which cooperates with the groove 112, improving the structural stability of the battery module 100 during working.

[0056] In some embodiments of the present application, the shape of the end of the battery cell 20 in the width direction is matched with the shape of the groove 112, which is advantageous to further improve the assembly accuracy of the battery cell 20, improve the contact area between the battery cell 20 and the body, further reduce the expansion and deformation of the battery cell 20 in the present application during working, and make the structure of the battery cell module more stable. For example, the structure of the battery cell 20 is square (i.e. the battery cell 20 is a square battery cell 20), and correspondingly, the groove 112 is a square groove. Of course, in other embodiments of the present application, the shape of the end of the battery cell 20 in the width direction can also be other shapes, which are not limited herein.

[0057] In some embodiments of the present application, the height of the cell 20 near one end of the groove 112 is L1, the height of the groove 112 is L2, and the entire width direction end of the cell 20 is located in the groove 112, and L2 / L1 is not less than 0.8. In this way, the contact area between the cell 20 and the first plate body 11 is further increased, the expansion deformation of the cell 20 in the present application during operation is further reduced, and the structure of the battery module 100 is more stable.

[0058] As shown in the examples, Figure 1 and Figure 3 the cell is a square cell, and the height of the cell is L1, which refers to the height direction of the shell. The height direction of the shell, the length direction of the shell, and the width direction of the shell are perpendicular to each other. As shown in the examples, the first sealing cavity of the first plate body contains a phase change material, and the melting point of the phase change material is 30-80°C. In this way, the temperature of the cell 20 or the battery module 100 in the present application is stabilized at 30-80°C.

[0059] Specifically, the shell 10 includes a pair of first plate bodies 11 (i.e., the shell 10 includes two first plate bodies 11), and the pair of first plate bodies 11 are oppositely arranged along the width direction of the battery module 100. The two ends of the cell 20 in the width direction are respectively matched with the grooves 112 on the pair of first plate bodies 11. In this way, the stability of the battery module 100 in the embodiments of the present application is further improved. As shown in the examples, the pair of first plate bodies 11 are generally symmetrically arranged, and the two ends of the cell 20 in the width direction are respectively matched with the corresponding grooves 112 on the pair of first plate bodies 11.

[0060] In some embodiments of the present application, a heat-conducting layer is arranged between the cell 20 and the first plate body 11. As shown in the examples, the side surface of the cell 20 (i.e., the surface of the cell 20 opposite to the groove 112) is provided with heat-conducting glue, and the cell 20 is fixed in the groove 112 by the heat-conducting glue. In this way, the heat-conducting glue is beneficial to faster conduction of heat on the cell 20 to the first plate body 11, and is beneficial to further improving the temperature stability and structural stability of the cell 20 in the shell 10.

[0061] In some embodiments of the present application, the first plate body 11 is an aluminum alloy plate. In this way, the strength of the shell 10 is ensured while the first shell 10 has a smaller volume and a lighter weight.

[0062] In some embodiments of the present application, a plurality of grooves 112 are arranged along the length direction of the battery module 100, and the plurality of grooves 112 and the plurality of cells 20 are one-to-one correspondingly arranged. In this way, the assembly precision of the cell 20 is further improved.

[0063] In some embodiments of the present application, the first sealed cavity 111 comprises a plurality of first sub-cavities 111a, the plurality of first sub-cavities 111a are distributed along the length direction of the battery module 100, and each of the first sub-cavities 111a extends along the height direction of the battery module 100. In this way, the temperature control of the battery cells 20 can be differentiated. For example, if the battery cells 20 located near the middle position have a higher temperature than the battery cells 20 located at the edge position, the first sub-cavities 111a corresponding to the battery cells 20 located near the middle position can be provided with better cooling effect or more phase change materials, so that the battery cells 20 located near the middle position can be cooled faster, thereby realizing differentiated temperature adjustment of the battery cells 20 at different positions and meeting more use scenarios.

[0064] In some embodiments of the present application, referring to Figure 4 and Figure 5 , along the length direction of the battery module 100, at least part of the first sub-cavities 111a are arranged corresponding to the adjacent two grooves 112, that is, at least part of the first sub-cavities 111a are arranged opposite to the side surfaces of the adjacent two battery cells 20. In this way, it is beneficial to reduce the temperature difference between the adjacent two battery cells 20, and further improve the stability of the battery cells 20 in operation.

[0065] In some embodiments of the present application, referring to Figures 1 to 3 , the shell 10 further comprises a pair of second plate bodies 12 (i.e. two second plate bodies), the pair of second plate bodies 12 are arranged opposite along the length direction of the battery module 100, the first plate body 11 is arranged between the pair of second plate bodies 12, and the two ends of the first plate body 11 in the width direction are connected with the pair of second plate bodies 12, respectively, that is, the pair of first plate bodies 11 and the pair of second plate bodies 12 form a square shell 10. In this way, it is beneficial to simplify the structure of the shell 10 and improve the structural compactness of the battery module 100.

[0066] In some embodiments of the present application, the second plate body 12 is provided with a second sealed cavity, and the second sealed cavity is used for accommodating phase change materials. In this way, it is beneficial to further reduce the weight and deformation amount of the battery module 100 in operation, and improve the stability of the battery module 100 in operation.

[0067] In some embodiments of the present application, the second plate body 12 is provided with a second sealed cavity, and the second sealed cavity comprises a plurality of second sub-cavities 121a, at least part of the second sub-cavities 121a are used for accommodating phase change materials, and the plurality of second sub-cavities 121a are distributed along the height direction of the battery module 100, and each of the second sub-cavities 121a extends along the width direction of the battery module 100. In this way, the temperature control of different regions of the battery cells 20 can be differentiated.

[0068] In some embodiments of the present application, the plurality of battery cells 20 are clamped between a pair of second plate bodies 12. In this way, the plurality of battery cells 20 in the housing 10 are further limited in deformation along the thickness direction (i.e. the length direction of the battery module 100) by the compression force of the battery cells 20 abutting against the second plate bodies.

[0069] In some embodiments of the present application, referring to Figure 6 , the battery module 100 further comprises a heat dissipation plate 30 arranged between two adjacent battery cells 20. Further, the heat dissipation plate 30 is also arranged between the second plate body 12 and the battery cell. In this way, by arranging the heat dissipation plate 30 between two adjacent battery cells 20, the heat transfer between the two adjacent battery cells 20 is facilitated, the temperature stability of the plurality of battery cells 20 in the housing 10 is improved, and the volume expansion of the battery cells 20 during operation is reduced, thereby improving the stability of the battery module 100. Exemplarily, the heat dissipation plate 30 can be a fiber heat dissipation plate 30 (e.g. a heat-conductive carbon fiber heat dissipation plate 30) or a rubber heat dissipation plate 30 (e.g. a silica gel heat dissipation plate 30), which is not limited herein.

[0070] Specifically, the heat dissipation plate 30 is provided with a sealed cavity for accommodating a phase change material. The sealed cavity and the phase change material can be referred to the first plate body or the second plate body, which is not repeated here.

[0071] In some embodiments of the present application, referring to Figure 6 , the battery module 100 further comprises a buffer plate 40 arranged between the battery cell 20 and the second plate body 12, i.e. the first plate body 11 and / or the second plate body 12 abut against the corresponding battery cell 20 through the buffer plate 40. Exemplarily, the buffer plate 40 is an insulating buffer plate, which is beneficial to avoid the leakage of the housing 10 and improve the buffering performance and safety performance of the battery module 100.

[0072] In some embodiments of the present application, the battery module 100 further comprises a buffer plate 40 arranged between two adjacent battery cells 20. In this embodiment, by arranging the buffer plate 40 between two adjacent battery cells 20, rigid contact between the two adjacent battery cells 20 is avoided, which is beneficial to improve the buffering performance of the battery module 100.

[0073] In some embodiments of the present application, the first plate body 11 and / or the second plate body 12 is a metal plate or an alloy plate. In this way, the mechanical strength of the housing 10 is improved, and the mass of the housing 10 is reduced.

[0074] In some embodiments of the present application, referring to Figures 7 to 10The battery module 100 further comprises a connecting plate 50, and the tab of each of the plurality of battery cells 20 is arranged on the same side; the connecting plate 50 is arranged on the same side as the battery cell 20, and the connecting plate 50 is electrically connected to the adjacent two battery cells 20 through the tab. For example, the connecting plate 50 is connected to the tabs of the adjacent two battery cells 20, and the adjacent two battery cells 20 are connected in series through the connecting plate 50.

[0075] Further, the connecting plate 50 has a first opening 50a and a second opening 50b arranged at intervals thereon, and the adjacent two battery cells 20 include a first battery cell and a second battery cell, the first tab 21 of the first battery cell is located in the first opening 50a, and the second tab 22 of the second battery cell is located in the second opening 50b, and the first tab 21 and the second tab 22 are electrically connected through the connecting plate 50. Specifically, the first tab 21 includes a first positive tab 21a and a first negative tab 21b, and the second tab 22 includes a second positive tab 22a and a second negative tab 22b, the first positive tab 21a and the second negative tab 22b are arranged adjacent to and opposite to each other, and the first positive tab 21a and the second negative tab 22b are electrically connected through the connecting plate 50.

[0076] In some embodiments of the present application, each battery cell 20 includes a positive tab and a negative tab, and the positive tab and the negative tab of each battery cell are arranged at intervals along the width direction of the battery cell 20. In the adjacent two battery cells 20, the positive tab of one battery cell 20 is arranged opposite to (i.e., on the same side as) the negative tab of the other battery cell 20. The battery module 100 includes a plurality of connecting plates 50, and along the width direction of the battery cell 20, the plurality of connecting plates 50 include a first connecting plate group and a second connecting plate group, the first connecting plate group includes a plurality of first connecting plates 51c arranged at intervals along the length direction of the battery module, and the second connecting plate group includes a plurality of second connecting plates 51d arranged at intervals along the length direction of the battery module, and the first connecting plate 51c or the second connecting plate 51d connects one positive tab and one negative tab arranged opposite to each other on the adjacent two battery cells 20.

[0077] Specifically, along the width direction of the battery module 100, the first connecting plate 51c and the second connecting plate 51d arranged adjacent to each other are arranged alternately, and along the height direction of the battery module 100 (i.e., the direction perpendicular to F1 and F2 respectively), the first connecting plate 51c and the second connecting plate 51d are located on the same plane. In this way, it is beneficial to improve the smoothness of the electrical connection between the adjacent two battery cells 20 and the connecting plate 50, and further improve the structural compactness of the battery module 100. It should be noted that in the embodiments of the present application, the structures of the first connecting plate 51c and the second connecting plate 51d can be the same or different, which is not limited herein. For example, the structures of the first connecting plate 51c and the second connecting plate 51d are the same.

[0078] In some embodiments of the present application, the connecting plate 50 comprises an insulating body 51 and a conductive layer 52 on the insulating body 51. The first opening 50a and the second opening 50b are provided on the insulating body 51, and the conductive layer 52 covers the portion of the insulating body 51 between the first opening 50a and the second opening 50b, and the first tab 21 and the second tab 22 are electrically connected through the conductive layer 52. The first opening 50a and the second opening 50b are arranged in the width direction of the insulating body 51 (i.e. the length direction of the battery module 100). The first opening 50a and the second opening 50b respectively extend in the length direction of the insulating body 51 (i.e. the width direction of the battery module 100), and in the length direction of the insulating body 51, the size of the first opening 50a is greater than the size of the first tab 21, the size of the second opening 50b is greater than the size of the second tab 22, and the area of the first opening 50a is greater than the cross-sectional area of the first tab 21, and the area of the second opening 50b is greater than the cross-sectional area of the second tab 22. In this way, the first tab 21 can smoothly pass through the first opening 50a, the second tab 22 can smoothly pass through the second opening 50b, then the end of the first tab 21 (i.e. the free end of the first tab 21 or the end away from the shell 10) passing through the first opening 50a is bent towards the conductive layer 52 to make it electrically connected with the conductive layer 52, and the end of the second tab 22 (i.e. the free end of the second tab 22 or the end away from the shell 10) passing through the second opening 50b is bent towards the conductive layer 52 to make it electrically connected with the conductive layer 52, which is conducive to improving the stability of the electrical connection between the two adjacent battery cells 20 and improving the assembly efficiency.

[0079] In some embodiments of the present application, in the width direction of the insulating body 51, please refer to Figure 10 , the conductive layer 52 has a first conductive end 52a and a second conductive end 52b, the first conductive end 52a extends into the first opening 50a, and the second conductive end 52b extends into the second opening 50b. In this way, it is conducive to increasing the contact area of the conductive layer 52 with the first tab 21 and the second tab 22, and further improving the convenience and stability of the electrical connection of the first tab 21 and the second tab 22.

[0080] The embodiments of the present application also provide a battery pack comprising at least one of the battery module 100. Since the battery pack in the embodiments of the present application comprises the above battery module 100, it has the beneficial effects of the battery module 100 described in the present application. For example, the battery pack comprises a box body and a plurality of battery modules 100, and the plurality of battery modules 100 are fixed in the box body.

[0081] In some embodiments of the present application, the battery pack further comprises an electrical system, a thermal management system, a bms (battery management system), etc. It should be noted that the electrical system, the thermal management system and the bms are not the main improvement points of the present application, and will not be described here.

[0082] In the above-described embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the detailed description of other embodiments above, which will not be repeated here.

[0083] The foregoing merely illustrates the principles of the application. It will thus be appreciated that those skilled in the art will be able to devise various arrangements which, although not explicitly described or shown herein, embody the principles of the application and are thus within its spirit and scope. It will be understood that the application is not limited to the embodiments described above, but includes all embodiments which would normally occur to persons of ordinary skill in the art upon reading the above description and appended claims.

[0084] Also, the use of "a" or "an" to describe embodiments is intended to be a non-limiting term, meaning one or more. Similarly, the use of "another" is intended to be a non-limiting term, meaning one or more. As used herein, the term "about" means that quantities, dimensions, sizes, formulations, parameters, shapes and other characteristics need not be exact, but can be approximated and / or

[0085] Similarly, it is to be noticed that the term "comprising", used in the description, is not intended to exclude other elements or steps. It is to be understood that the embodiments can also be in the form of a computer program containing one or more sequences of machine-readable instructions coded for execution by a computer. The machine-readable instructions provide the implementation of the various computer-implemented steps of the embodiments. The computer program is in itself a computer-implemented method, and can be in the form of a source code, an object code, a code intermediate source and object code such as in a partially compiled form, or in an interpreted form. The computer program can be stored on a computer-readable storage medium which can be any storage medium known or to be known in the art. The computer-readable storage medium can be a non-transitory computer-readable storage medium. The computer program can be in the form of a computer program product.

[0086] Some embodiments use numerical ranges to describe quantities of components, attributes, etc. It should be understood that the use of a numerical range is descriptive of some embodiments and that such ranges can be modified by the use of the modifier "about" or "approximately" in some examples. Unless otherwise stated, "about" or "approximately" means ±20% of the indicated value. Accordingly, numerical parameters such as those for quantities, proportions, mixing or reaction, or other preferred ranges, are approximations. As used herein, the term "about" means that quantities, dimensions, sizes, formulations, parameters, shapes and other characteristics need not be exact, but can be approximated and / or

[0087] The above has carried out the detailed introduction to the battery module and the battery pack provided by the embodiment of the application, the principle and the implementation mode of the application are described in the text by applying specific examples, the above embodiment description is only for helping understanding the method of the application and its core idea; meanwhile, for the person skilled in the art, according to the idea of the application, the specific implementation mode and the application range will have the change, and the above is described, and the content of the specification should not be understood as the limitation of the application.

Claims

1. A battery module, characterized by, The battery module comprises a shell, a heat dissipation plate and a plurality of battery cells; The heat dissipation plate and the plurality of battery cells are arranged in the shell; The plurality of battery cells are stacked along the length direction of the shell; The heat dissipation plate is arranged between adjacent two battery cells and / or the heat dissipation plate is arranged between the battery cell and the shell.

2. The battery module of claim 1, wherein, The battery module further comprises a buffer plate arranged between the heat dissipation plate and the battery cell and / or arranged between the battery cell and the shell; and / or The battery cell comprises a square battery cell or a soft package battery cell.

3. The battery module of claim 1, wherein, The shell comprises a first plate body, the first plate body is provided with a first sealed cavity for accommodating phase change material, the side of the first plate body facing the battery cell is provided with a plurality of grooves, the grooves are arranged opposite to at least one battery cell, and the grooves are matched with one end of the battery cell in the width direction to limit the battery cell.

4. The battery module of claim 3, wherein, The shape of one end of the battery cell in the width direction is matched with the shape of the groove; and / or The first sealed cavity of the first plate body contains phase change material, and the melting point of the phase change material is 30-80℃; and / or The height of one end of the battery cell close to the groove is L1, the height of the groove is L2, all the one end of the battery cell in the width direction is located in the groove, and L2 / L1 is not less than 0.8; and / or The first plate body is an aluminum alloy plate.

5. The battery module of claim 3, wherein, A plurality of grooves are arranged along the length direction of the shell, and a plurality of grooves and a plurality of battery cells are arranged one by one; and / or The groove is clamped with one end of the battery cell in the width direction to limit the battery cell; and / or The shell comprises two first plate bodies, the two first plate bodies are arranged opposite to each other along the width direction of the shell, the plurality of battery cells are arranged between the two first plate bodies, and the two ends of the battery cell in the width direction are matched with the grooves on the two first plate bodies, respectively; and / or A heat conduction layer is arranged between the battery cell and the first plate body; and / or The first sealed cavity comprises a plurality of first sub-cavities, a plurality of first sub-cavities are distributed along the length direction of the shell, and each first sub-cavity extends along the height direction of the shell; and / or Along the length direction of the shell, at least part of the first sub-cavities are arranged corresponding to adjacent two grooves.

6. The battery module of claim 3, wherein, The shell further comprises two second plate bodies, the two second plate bodies are arranged opposite to each other along the length direction of the shell, the plurality of battery cells are arranged between the two second plate bodies, the first plate body is arranged between the two second plate bodies, and the two ends of the first plate body in the width direction are connected with the two second plate bodies, respectively.

7. The battery module of claim 6, wherein, The second plate body is provided with a second sealed cavity for accommodating phase change material; or The second plate body is provided with a second sealed cavity, the second sealed cavity comprises a plurality of second sub-cavities, at least part of the second sub-cavities are used for accommodating phase change material, a plurality of second sub-cavities are distributed along the height direction of the shell, and each second sub-cavity extends along the width direction of the shell.

8. The battery module of claim 3, wherein, The battery module further comprises a connecting plate, the tabs of the plurality of battery cells are disposed on the same side; the connecting plate is disposed on the same side as the tabs, and the connecting plate is electrically connected to the adjacent two battery cells through the tabs.

9. The battery module of claim 8, wherein, The connecting plate has a first opening and a second opening disposed at intervals, and the adjacent two battery cells comprise a first battery cell and a second battery cell, the first tab of the first battery cell is located in the first opening, and the second tab of the second battery cell is located in the second opening, and the first tab and the second tab are respectively electrically connected to the connecting plate.

10. A battery pack, characterized by, The battery pack comprises at least one battery module according to any one of claims 1 to 9.

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