Battery module, battery with same, and electric device

Abstract

A battery module, a battery with same, and an electric device. The battery module (100) comprises: a plurality of battery cells (10), wherein the plurality of battery cells (10) are at least partially arranged in sequence in a first direction, in two adjacent battery cells (10) in the first direction, side walls of the two battery cells (10) that are arranged facing each other are both first casing walls (11), and a first recess (111) is formed in at least one of the two first casing walls (11); and thermal insulation pads (20), one of which is at least partially arranged in the first recess (111).

Description

Battery module, battery and power-consuming device having the same

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202420003456.2 and application date of January 2, 2024, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery module, a battery having the same, and an electrical device. Background Art

[0004] Relevant technologies point out that in order to solve the problem of damage to adjacent battery cells caused by thermal runaway of battery cells, thermal insulation pads are currently added between two adjacent battery cells for insulation to reduce heat spread between adjacent battery cells, thereby solving the problem of damage to adjacent battery cells caused by thermal runaway of battery cells. However, in order to play a barrier role, the thermal insulation pad usually has a certain thickness, which will lead to a loss of battery energy density.

[0005] Application Contents

[0006] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a battery module that can reduce the space occupied by the thermal insulation pad between two adjacent battery cells, thereby arranging more battery cells and thus improving the energy density of the battery.

[0007] The present application also provides a battery having the above-mentioned battery module.

[0008] The present application also provides an electrical device having the battery.

[0009] According to the first aspect of the present application, the battery module includes: a plurality of battery cells, the plurality of battery cells are at least partially arranged in sequence along a first direction, and in two adjacent battery cells in the first direction, the side walls of the two battery cells arranged facing each other are both first shell walls, and at least one of the two first shell walls is formed with a first groove; and a thermal insulation pad, the thermal insulation pad is at least partially arranged in the first groove.

[0010] According to the battery module of the present application, by forming a first groove on at least one of the two first shell walls and arranging the thermal insulation pad at least partially in the first groove, the space occupied by the thermal insulation pad between two adjacent battery cells can be reduced. Therefore, when the size of the battery module is certain, more battery cells can be arranged, thereby improving the energy density of the battery.

[0011] In some embodiments, surfaces of the two first shell walls facing each other in the first direction are outer surfaces, and the first groove is formed on the outer surfaces of the first shell walls.

[0012] This embodiment forms a first groove on the outer surface of the first shell wall, which can reduce the manufacturing process of the first groove and improve the production rate of the battery cell. At the same time, it is also beneficial to the installation of the thermal insulation pad, thereby improving the assembly rate of the battery module.

[0013] In some embodiments, the first groove is formed on both of the first shell walls, and both of the first grooves are formed on the outer surface of the first shell wall. The two first grooves are connected and cooperate to define an insulating space, and the insulating pad is arranged in the insulating space.

[0014] This embodiment can limit the installation position of the thermal insulation pad by setting the thermal insulation space, which is beneficial to the installation of the thermal insulation pad. At the same time, it can also limit the movement of the thermal insulation pad in multiple directions, effectively reducing the probability of the thermal insulation pad running off the track, thereby ensuring the thermal insulation effect of the thermal insulation pad.

[0015] In some embodiments, one thermal insulation pad is provided in the thermal insulation space; or, a plurality of thermal insulation pads are provided in the thermal insulation space.

[0016] This embodiment provides an insulation pad in the insulation pad space, which can reduce the assembly steps of the battery module and help improve the assembly rate of the battery module; by providing multiple insulation pads, insulation pads of different materials or sizes can be selected according to actual conditions, which can further improve the insulation effect of the insulation pad.

[0017] In some embodiments, surfaces of the two first shell walls facing each other in the first direction are inner surfaces, and the first groove is formed on the inner surfaces of the first shell walls.

[0018] In this embodiment, the surfaces of the two first shell walls facing each other in the first direction are set as inner surfaces, and the first groove is formed on the inner surface of the first shell wall, so that the thermal insulation pad is directly placed in the accommodating cavity of the battery cell. Therefore, when the battery cell suffers thermal runaway, the high-temperature and high-pressure material can be directly isolated from the shell, thereby further reducing the risk of the shell being melted, and further reducing the risk of heat and high-temperature and high-pressure material diffusing to other battery cells and causing damage to other battery cells.

[0019] In some embodiments, the number of the first grooves on the first shell wall is one or more, and the plurality of first grooves are arranged at intervals on the first shell wall.

[0020] In this embodiment, by setting the number of first grooves on the first shell wall to one or more, the size of the first groove and the thermal insulation pad arranged in the first groove can be designed according to the heating area of ​​the first shell wall, thereby further increasing the thermal insulation effect between two adjacent battery cells and further reducing the heat diffusion between two adjacent battery cells.

[0021] In some embodiments, the first groove is a circular groove, an elliptical groove, or a polygonal groove.

[0022] In this embodiment, by setting the first groove to be a circular groove, an elliptical groove or a polygonal groove, the shape of the first groove can be selected according to actual conditions, thereby improving flexibility of use. At the same time, the circular groove, the elliptical groove or the polygonal groove has a simple structure and is easy to manufacture, thereby reducing the difficulty of manufacturing the first groove and improving the manufacturing rate of the first shell wall.

[0023] In some embodiments, the distance between the periphery of the first groove and the periphery of the first shell wall is greater than or equal to 0.5 mm; and / or, in the length direction or width direction of the first shell wall, the ratio of the distance between the periphery of the first groove and the periphery of the first shell wall to the size of the first shell wall is 0.5 / 300 to 100 / 300.

[0024] In this embodiment, by setting the spacing between the perimeter of the first groove and the perimeter of the first shell wall to be greater than or equal to 0.5 mm, the first groove can avoid weak points in the first shell wall, ensuring the structural strength of the overall shell, effectively reducing the risk of cracking between adjacent walls, and thus improving the reliability of the battery cells. By setting the ratio of the spacing between the perimeter of the first groove and the perimeter of the first shell wall in the length or width direction of the first shell wall to the size of the first shell wall to be 1 / 600 to 1 / 3, the spacing between the perimeter of the first groove and the perimeter of the first shell wall is not too small, allowing the first groove to avoid weak points in the first shell wall, ensuring the structural strength of the overall shell, effectively reducing the risk of cracking between adjacent walls, and thus improving the reliability of the battery cells. The spacing between the perimeter of the first groove and the perimeter of the first shell wall is also not too large, ensuring sufficient space for installing the thermal insulation pad. The size of the thermal insulation pad meets the thermal insulation requirements of two adjacent battery cells, reducing the area of ​​direct contact between the two adjacent battery cells, and thus reducing heat diffusion and the risk of damage to adjacent battery cells.

[0025] In some embodiments, the spacing between the peripheral wall of the first groove and the peripheral edge of the first shell wall is 0.5 mm to 2 mm; and / or, in the length direction or width direction of the first shell wall, the ratio of the spacing between the peripheral edge of the first groove and the peripheral edge of the first shell wall to the size of the first shell wall is 2 / 300 to 10 / 300.

[0026] In this embodiment, the spacing between the peripheral wall of the first groove and the peripheral edge of the first shell wall is set to 0.5mm~2mm, so that the spacing between the peripheral wall of the first groove and the peripheral edge of the first shell wall will not be too small, and the first groove can avoid the weak points of the first shell wall, thereby ensuring the structural strength of the overall shell and effectively reducing the risk of cracking between two adjacent walls, thereby improving the reliability of the battery cell; it can also ensure that the spacing between the peripheral wall of the first groove and the peripheral edge of the first shell wall is not too large, thereby ensuring the installation space of the thermal insulation pad, so that the size of the thermal insulation pad can meet the thermal insulation requirements of two adjacent battery cells, reduce the area of ​​direct contact between two adjacent battery cells, and thereby reduce heat diffusion and reduce the risk of damage to adjacent battery cells. By arranging in the length direction or width direction of the first shell wall, the ratio between the distance between the circumference of the first groove and the circumference of the first shell wall and the size of the first shell wall is 1 / 150 to 1 / 30, so that the first groove does not affect the structural strength of the battery cell shell, and can ensure the installation space of the thermal insulation pad, so that the size of the thermal insulation pad can meet the thermal insulation requirements between adjacent battery cells, thereby reducing heat diffusion and reducing the risk of damage to adjacent battery cells.

[0027] In some embodiments, a concave first groove is formed on one side surface of the first shell wall in the first direction, and the other side surface of the first shell wall is a plane.

[0028] In this embodiment, a concave first groove is formed on one side surface of the first shell wall in the first direction, and the other side surface is flat, thereby reducing the influence of the first groove on the energy density of the battery cell.

[0029] In some embodiments, a ratio of the depth of the first groove to the thickness of the first shell wall is 1 / 6 to 5 / 6.

[0030] In this embodiment, by setting the ratio of the depth of the first groove to the thickness of the first shell wall to 1 / 6 to 5 / 6, the depth of the first groove can be prevented from being too deep, thereby ensuring the structural strength of the first shell wall; at the same time, the depth of the first groove can be prevented from being too shallow, which is conducive to placing the thermal insulation pad and ensuring the installation space of the thermal insulation pad.

[0031] In some embodiments, the ratio of the depth of the first groove to the thickness of the first shell wall is 1 / 4 to 1 / 2.

[0032] In this embodiment, by setting the ratio of the depth of the first groove to the thickness of the first shell wall to 1 / 4 to 1 / 2, the depth of the first groove can be further reduced on the basis of meeting the installation space of the thermal insulation pad, thereby further increasing the structural strength of the first shell wall and enhancing the protective effect of the first shell wall on the battery cell.

[0033] In some embodiments, the depth of the first groove is 0.1 mm to 2 mm.

[0034] In this embodiment, the depth of the first groove is set to 0.1mm to 2mm, so that the depth of the first groove can meet the placement space of the thermal insulation pad without affecting the structural strength required by the first shell wall, so that the first shell wall can still protect the battery cell.

[0035] In some embodiments, the first groove is stamped on the first shell wall.

[0036] In this embodiment, the first groove is provided on the first shell wall by stamping. The stamping process is simple to produce, thereby reducing the difficulty of producing the first groove and improving the production rate of the battery cell. At the same time, the stamping is performed according to the mold, has high dimensional accuracy and good interchangeability, and can meet general assembly and use requirements without further mechanical processing. In addition, during the stamping process, since the surface of the material is not damaged, it has good surface quality and a smooth and beautiful appearance, which provides convenient conditions for surface treatment such as installation and welding.

[0037] In some embodiments, the first groove is punched from the outer surface toward the inner surface of the first shell wall, and the depth of the first groove is 2 mm to 10 mm.

[0038] In this embodiment, the first groove is stamped from the outer surface of the first shell wall toward the inner surface, so that the first groove is formed on the outer surface of the first shell wall, which is conducive to the installation of the thermal insulation pad; at the same time, the depth of the first groove is set to 2mm~10mm, so that the depth of the first groove is not too large, thereby reducing the space occupied by the first shell wall in the accommodating cavity, thereby ensuring the energy density of the battery cell; at the same time, the depth of the first groove is not too small, so that the depth can be adapted to the thermal insulation pad, which is convenient for the installation of the thermal insulation pad.

[0039] In some embodiments, some of the multiple battery cells are arranged along a second direction, which is perpendicular to the first direction. In two adjacent battery cells in the second direction, the side walls of the two battery cells arranged facing each other are both second shell walls, and at least one of the two second shell walls is formed with a second groove, and the thermal insulation pad is provided in the second groove.

[0040] In this embodiment, a second groove is formed in at least one of the two second shell walls, and a thermal insulation pad is provided in the second groove. When thermal runaway occurs in a battery cell, the thermal insulation pad can block heat diffusion in multiple directions, thereby further reducing the risk of heat diffusion to adjacent battery cells and improving battery reliability.

[0041] In some embodiments, some of the multiple battery cells are arranged along a third direction, which is perpendicular to the first direction. In two adjacent battery cells in the third direction, the side walls of the two battery cells arranged facing each other are both third shell walls, and at least one of the two third shell walls is formed with a third groove, and the thermal insulation pad is provided in the third groove.

[0042] In this embodiment, a third groove is formed by providing at least one of the two third shell walls, and a thermal insulation pad is provided in the third groove, so that the thermal insulation pad can fully cover the meltable part of the battery cell shell, further reducing the risk of heat diffusion to adjacent battery cells, thereby improving the reliability of the battery.

[0043] In some embodiments, an explosion-proof valve is provided at at least one end of the battery cell in the third direction, and the thermal insulation pad is symmetrically arranged about the explosion-proof valve along a center line parallel to the first direction. In the second direction, the ratio of the size of the thermal insulation pad to the size of the explosion-proof valve is 1 to 30, and the first direction, the second direction and the third direction are perpendicular to each other.

[0044] In this embodiment, the ratio of the size of the thermal insulation pad to the size of the explosion-proof valve in the second direction is 1 to 30, so that the size of the thermal insulation pad is not too small, and the size of the thermal insulation pad arranged on the first shell wall in the second direction can completely cover the size of the explosion-proof valve, thereby allowing the thermal insulation pad to cover the easily melted part of the first shell wall, thereby reducing the high-temperature and high-pressure substances discharged through the melted part of the first shell wall and reducing the risk of heat diffusion to other battery cells; at the same time, it also ensures that the size of the thermal insulation pad is not too large, so that the size of the thermal insulation pad in the second direction can meet the thermal insulation requirements while reducing the material usage of the thermal insulation pad, thereby reducing the production cost of the thermal insulation pad.

[0045] In some embodiments, in the second direction, a ratio of a size of the thermal insulation pad to a size of the explosion-proof valve is 1.5-10.

[0046] In this embodiment, by setting the ratio of the size of the thermal insulation pad to the size of the explosion-proof valve in the second direction to 1.5 to 10, the size of the thermal insulation pad in the second direction can completely cover the size of the explosion-proof valve and the easily fusible portion of the first shell wall, thereby reducing the high-temperature and high-pressure substances discharged through the molten portion of the first shell wall, further reducing the risk of heat diffusion to other battery cells; at the same time, it can also reduce the material usage of the thermal insulation pad, thereby reducing the production cost of the thermal insulation pad.

[0047] In some embodiments, the battery cell is provided with an explosion-proof valve at at least one end in the third direction, and the width of the first groove in the second direction remains unchanged or gradually decreases in the direction gradually away from the explosion-proof valve in the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0048] In this embodiment, by keeping the width of the first groove in the second direction unchanged as it moves gradually away from the explosion-proof valve in the third direction, the thermal insulation pad can meet the thermal insulation requirements between adjacent battery cells, thereby reducing the difficulty of manufacturing the first groove; by gradually reducing the width of the first groove in the second direction as it moves gradually away from the explosion-proof valve in the third direction, the thermal insulation pad can reduce its usage area while still meeting the thermal insulation requirements between adjacent battery cells, thereby reducing the production cost of the battery module; at the same time, the area occupied by the first groove on the first shell wall can also be reduced, thereby improving the structural strength of the first shell wall.

[0049] In some embodiments, the thickness of the thermal insulation pad is 0.5 mm to 3 mm.

[0050] This embodiment sets the thickness of the thermal insulation pad to 0.5mm to 3mm, ensuring that the thickness is not too small. This helps the pad meet the thermal insulation requirements between battery cells. This effectively reduces the amount of heat transferred to adjacent battery cells when a battery cell experiences thermal runaway, reducing heat diffusion and the risk of damage to adjacent battery cells. Furthermore, the thickness of the thermal insulation pad is not too large, thereby reducing the space occupied by the pad in the battery module. This allows more battery cells to be stacked within the same size battery module, thereby increasing the battery's energy density.

[0051] In some embodiments, the thickness of the thermal insulation pad is 0.8 mm to 2.5 mm.

[0052] In this embodiment, by setting the thickness of the thermal insulation pad to 0.8mm to 2.5mm, the thickness of the thermal insulation pad can not only meet the thermal insulation requirements between battery cells, but also further reduce the space occupied by the thermal insulation pad, thereby further improving the energy density of the battery.

[0053] The battery according to the second aspect of the present application includes the battery module according to the first aspect of the present application.

[0054] According to the battery of the present application, the battery module of the first aspect is provided, thereby improving the overall performance of the battery.

[0055] An electrical device according to the third aspect of the present application includes the battery according to the second aspect of the present application, and the battery is used to provide electrical energy.

[0056] According to the electric device of the present application, the battery of the second aspect is provided, thereby improving the overall performance of the electric device.

[0057] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] FIG1 is a schematic diagram of a vehicle according to an embodiment of the present application;

[0059] FIG2 is a schematic diagram of a battery according to an embodiment of the present application;

[0060] FIG3 is an exploded view of a battery according to an embodiment of the present application;

[0061] FIG4 is a partial schematic diagram of a battery according to an embodiment of the present application;

[0062] FIG5 is a schematic diagram of a battery module according to an embodiment of the present application;

[0063] FIG6 is a partial schematic diagram of the battery module shown in FIG5 ;

[0064] FIG7 is a partial cross-sectional view of the battery module shown in FIG5;

[0065] FIG8 is a schematic diagram of the battery cell shown in FIG5;

[0066] FIG9 is a schematic diagram of the battery cell shown in FIG5 from another angle;

[0067] FIG10 is a schematic diagram of the battery cell shown in FIG5 from another angle;

[0068] FIG11 is a schematic diagram of the battery cell shown in FIG5 from another angle;

[0069] FIG12 is a schematic diagram of the battery cell shown in FIG5 from another angle;

[0070] FIG13 is a schematic diagram of a battery module according to another embodiment of the present application;

[0071] FIG14 is a partial schematic diagram of the battery module shown in FIG13;

[0072] FIG15 is a schematic diagram of the battery cell shown in FIG13;

[0073] FIG16 is a schematic diagram of a battery module according to another embodiment of the present application;

[0074] FIG17 is a schematic diagram of the battery cell shown in FIG13;

[0075] FIG18 is a schematic diagram of another battery cell;

[0076] FIG19 is a schematic diagram of another battery cell;

[0077] FIG20 is a cross-sectional view of a battery cell at one angle;

[0078] FIG21 is a cross-sectional view of a battery cell from another angle.

[0079] Figure numerals: 1. Vehicle; 1000. Battery; 100. Battery module; 10. Battery cell; 11. First shell wall; 111. First groove; 12. Terminal; 13. Explosion-proof valve; 20. Thermal insulation pad; 30. Longitudinal beam; 200. Box body; 201. Main box; 202. Cover plate; 2000. Controller; 3000. Motor. DETAILED DESCRIPTION

[0080] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0081] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0082] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0083] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0084] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0085] In the description of the embodiments of the present application, the term "plurality" refers to more than two (including two).

[0086] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0087] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0088] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0089] During the operation of a power battery, a battery cell may experience thermal runaway due to unexpected conditions such as a short circuit. When thermal runaway occurs, the internal pressure and temperature of the battery cell will rise rapidly, and high-temperature, high-pressure substances will be generated inside the battery cell. These high-temperature, high-pressure substances will flow within the battery cell's containment cavity and be discharged through the battery cell's explosion-proof valve. The explosion-proof valve needs to discharge high-temperature, high-pressure gas to the outside for a certain period of time. During this period, the high-temperature, high-pressure gas inside the shell will act on the shell wall, causing it to soften or even melt, and when the shell is softened or melted by the high-temperature, high-pressure substance, the high-temperature, high-pressure substance may break through the shell and leak to the outside of the shell. The high-temperature, high-pressure substance released through the shell will spread to other battery cells, easily causing the risk of thermal runaway in other battery cells.

[0090] In order to solve the problem of damage to adjacent battery cells caused by thermal runaway of battery cells, thermal insulation pads are currently added between two adjacent battery cells for insulation to reduce heat spread between adjacent battery cells, thereby solving the problem of damage to adjacent battery cells caused by thermal runaway of battery cells. However, in order to play a barrier role, the thermal insulation pad usually has a certain thickness, which will lead to a loss of battery energy density.

[0091] Based on the above considerations, in order to solve the problem of how to improve the energy density of the battery under the premise that thermal runaway of the battery cell does not cause damage to the adjacent battery cells, a battery module is designed. A first groove is formed on at least one of the two first shell walls of two adjacent battery cells arranged facing each other, and the thermal insulation pad is arranged in the first groove. In this way, the space occupied by the thermal insulation pad between the two adjacent battery cells can be reduced, thereby reducing the distance between the two adjacent battery cells. When the size of the battery module is certain, more battery cells can be arranged, thereby improving the energy density of the battery.

[0092] The battery module disclosed in the embodiments of the present application can be used in electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. The electrical devices may be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, battery-powered vehicles, electric cars, ships, spacecraft, and the like. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and spacecraft may include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0093] For the convenience of description, the following embodiments are described by taking a vehicle 1 as an example of an electrical device according to an embodiment of the present application.

[0094] Referring to Figure 1, Figure 1 is a schematic diagram of a vehicle 1 provided in some embodiments of the present application. The vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 1000 is provided inside the vehicle 1, and the battery 1000 can be provided at the bottom, head or tail of the vehicle 1. The battery 1000 can be used to power the vehicle 1. For example, the battery 1000 can serve as an operating power source for the vehicle 1. The vehicle 1 can also include a controller 2000 and a motor 3000. The controller 2000 is used to control the battery 1000 to power the motor 3000, for example, for starting, navigating and operating power requirements of the vehicle 1 during driving.

[0095] In some embodiments of the present application, the battery 1000 can serve not only as an operating power source for the vehicle 1 , but also as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0096] 2-4 , FIG2 is a schematic diagram of a battery 1000 according to some embodiments of the present application, FIG3 is an exploded view of a battery 1000 according to some embodiments of the present application, and FIG4 is a partial schematic diagram of a battery 1000 according to some embodiments of the present application. The battery 1000 includes a housing 200 and a battery cell 10. The housing 200 has a cavity, and the battery cell 10 is accommodated in the cavity of the housing 200. The housing 200 is used to provide a storage space for the battery cell 10, and the housing 200 can adopt a variety of structures. In some embodiments, the housing 200 can include a first part (such as the main box 201 described below) and a second part (such as the cover plate 202 described below). The first part and the second part cover each other, and the first part and the second part together define a storage space for accommodating the battery cell 10. The second part can be a hollow structure with one end open, and the first part can be a plate-like structure. The first part covers the open side of the second part, so that the first and second parts together define a storage space. The first and second parts can also be hollow structures with one end open, with the open side of the first part covering the open side of the second part. Of course, the box 200 formed by the first and second parts can be of various shapes, such as a cylinder, a cuboid, etc.

[0097] In the battery 1000, there may be multiple battery cells 10, and the multiple battery cells 10 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 10. The multiple battery cells 10 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 10 may be housed within the housing 200. Of course, the battery 1000 may also be in the form of a battery module 100 formed by first connecting multiple battery cells 10 in series, in parallel, or in a hybrid connection, and then the multiple battery modules 100 are further connected in series, in parallel, or in a hybrid connection to form an entire battery cell 100, and then housed within the housing 200. The battery 1000 may also include other structures, for example, the battery 1000 may also include a busbar component for electrically connecting the multiple battery cells 10.

[0098] Each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 10 can be cylindrical, flat, rectangular, or in other shapes.

[0099] The battery module 100 according to an embodiment of the first aspect of the present application will be described below with reference to Figures 5 to 21. Figure 5 is a schematic diagram of a battery module 100 according to an embodiment of the present application, Figure 6 is a partial schematic diagram of the battery module 100 shown in Figure 5, Figure 7 is a partial cross-sectional view of the battery module 100 shown in Figure 5, Figure 8 is a schematic diagram of the battery cell 10 shown in Figure 6, Figure 9 is a schematic diagram of the battery cell 10 shown in Figure 5 from another angle, Figure 10 is a schematic diagram of the battery cell 10 shown in Figure 5 from yet another angle, Figure 11 is a schematic diagram of the battery cell 10 shown in Figure 5 from yet another angle, Figure 12 is a schematic diagram of the battery cell 10 shown in Figure 5 from another angle, and Figure 13 is a schematic diagram of the battery cell 10 shown in Figure 5 from yet another angle. FIG14 is a schematic diagram of a battery module 100 according to another embodiment of the present application, FIG14 is a partial schematic diagram of the battery module 100 shown in FIG13, FIG15 is a schematic diagram of the battery cell 10 shown in FIG13, FIG16 is a schematic diagram of a battery module 100 according to another embodiment of the present application, FIG17 is a schematic diagram of the battery cell 10 shown in FIG16, FIG18 is a schematic diagram of another battery cell 10, FIG19 is a schematic diagram of yet another battery cell 10, FIG20 is a cross-sectional view of the battery cell 10 at one angle, and FIG21 is a cross-sectional view of the battery cell 10 at another angle.

[0100] An embodiment of the present application proposes a battery module 100, as shown in Figure 5, comprising: a plurality of battery cells 10 and a thermal insulation pad 20, wherein the plurality of battery cells 10 are at least partially arranged in sequence along a first direction, and in two adjacent battery cells 10 in the first direction, the side walls of the two battery cells 10 arranged facing each other are both first shell walls 11, and at least one of the two first shell walls 11 is formed with a first groove 111; the thermal insulation pad 20 is at least partially arranged in the first groove 111.

[0101] The phrase "multiple battery cells 10 are at least partially arranged in sequence along a first direction" should be understood to mean that the multiple battery cells 10 can be partially or completely arranged in sequence along the first direction to form a battery module 100. Specifically, the multiple battery cells 10 are primarily used to store and release energy and are the core components of the battery 1000. The number of battery cells 10 can be selected based on the space available within the battery case 200, and the length can be flexible and varied to accommodate batteries 1000 of different sizes. For example, the number of battery cells 10 can be two, three, or more.

[0102] The thermal insulation pad 20 has high temperature resistance and corrosion resistance and is primarily used to reduce heat transfer between battery cells 10. When a battery cell 10 experiences thermal runaway, the thermal insulation pad 20 can prevent the thermal runaway from worsening and reduce the impact of the thermal runaway of the battery cell 10 on adjacent battery cells 10. The thermal insulation pad 20 can be made of a variety of materials, such as mica board, epoxy board, ceramic, etc.

[0103] Here, “at least one of the two first shell walls 11 is formed with a first groove 111 ” can be understood as meaning that only one of the two first shell walls 11 may be formed with the first groove 111 , or both first shell walls 11 may be formed with the first groove 111 .

[0104] “The thermal insulation pad 20 is at least partially disposed in the first groove 111” can be understood as follows: the thermal insulation pad 20 can be partially disposed in the first groove 111, or completely disposed in the first groove 111, and the size of the thermal insulation pad 20 can be adapted to the size of the first groove 111. The first groove 111 can limit the installation position of the thermal insulation pad 20, which is beneficial to the installation of the thermal insulation pad 20. At the same time, the thermal insulation pad 20 is at least partially disposed in the first groove 111, which can also reduce the space occupied by the thermal insulation pad 20 between two adjacent battery cells 10. Therefore, when the size of the battery module 100 is certain, more battery cells 10 can be arranged, thereby improving the energy density of the battery 1000.

[0105] Furthermore, the first direction can be the length direction of the battery cell 10 (for example, the front-to-back direction shown in Figure 5), the thickness direction of the battery cell 10 (for example, the top-to-bottom direction shown in Figure 5), or the width direction of the battery cell 10 (for example, the left-to-right direction shown in Figure 5).

[0106] Specifically, when the first direction is the length direction of the battery cell 10, the first shell wall 11 is the two side walls in the length direction of the battery cell 10; when the first direction is the width direction of the battery cell 10, the first shell wall 11 is the two side walls in the width direction of the battery cell 10, that is, one side of the end cap and the side opposite to the end cap of the battery cell 10; when the first direction is the thickness direction of the battery cell 10, the first shell wall 11 is the two side walls in the thickness direction of the battery cell 10, that is, the two large surfaces of the battery cell 10. Therefore, it can be understood that any wall of the battery cell 10 in this embodiment can be formed as the first shell wall 11, and the position of the first shell wall 11 mainly depends on the arrangement of the multiple battery cells 10.

[0107] When assembling the battery module 100, the thermal insulation pad 20 can be first fixed in the first groove 111, and then the battery cells 10 can be arranged in sequence along the first direction. When the battery cell 10 experiences thermal runaway, the heat will first be transferred to the first shell wall 11, and then transferred to the thermal insulation pad 20 through the first shell wall 11. Compared with the first shell wall 11, the thermal insulation pad 20 can withstand higher temperatures. Therefore, even if the first shell wall 11 is partially melted by high-temperature and high-pressure substances, the thermal insulation pad 20 can cover at least a portion of the melted portion of the first shell wall 11, thereby reducing the high-temperature and high-pressure substances discharged through the melted portion of the first shell wall 11, reducing the risk of heat diffusion to other battery cells 10, and improving the reliability of the battery 1000.

[0108] According to the battery module 100 of the embodiment of the present application, by forming a first groove 111 on at least one of the two first shell walls 11 and disposing the thermal insulation pad 20 at least partially in the first groove 111, the space occupied by the thermal insulation pad 20 between two adjacent battery cells 10 can be reduced. Therefore, when the size of the battery module 100 is certain, more battery cells 10 can be arranged, thereby improving the energy density of the battery 1000.

[0109] According to some embodiments of the present application, as shown in FIG. 6 and FIG. 7 , surfaces of the two first shell walls 11 facing each other in the first direction are outer surfaces, and the first groove 111 is formed on the outer surfaces of the first shell walls 11 .

[0110] Specifically, the outer surface of the first shell wall 11 refers to the surface facing each other of two adjacent battery cells 10, that is, the surface facing away from the accommodating cavity. The first groove 111 is formed on the outer surface of the first shell wall 11, which is conducive to the production of the first groove 111 and the installation of the thermal insulation pad 20.

[0111] In this embodiment, by forming the first groove 111 on the outer surface of the first shell wall 11, the manufacturing process of the first groove 111 can be reduced, and the production rate of the battery cell 10 can be improved. At the same time, it is also beneficial to the installation of the thermal insulation pad 20, thereby improving the assembly rate of the battery module 100.

[0112] According to some embodiments of the present application, as shown in Figures 6 and 7, a first groove 111 is formed on each of the two first shell walls 11, and the two first grooves 111 are formed on the outer surface of the first shell wall 11. The two first grooves 111 are connected and cooperate to define an insulating space, and the insulating pad 20 is arranged in the insulating space.

[0113] The shape and size of the thermal insulation space are adapted to the shape and size of the thermal insulation pad 20 .

[0114] This embodiment can limit the installation position of the thermal insulation pad 20 by setting the thermal insulation space, which is beneficial to the installation of the thermal insulation pad 20. At the same time, it can also limit the movement of the thermal insulation pad 20 in multiple directions, effectively reducing the probability of the thermal insulation pad 20 running off the track, thereby ensuring the thermal insulation effect of the thermal insulation pad 20.

[0115] According to some embodiments of the present application, a thermal insulation pad 20 is provided in the thermal insulation space; or, a plurality of thermal insulation pads 20 are provided in the thermal insulation space.

[0116] In some specific embodiments, one insulation pad 20 is provided within the insulation pad 20 space. In other specific embodiments, multiple insulation pads 20 are provided within the insulation space. For example, the number of insulation pads 20 may be two, three, or more. The multiple insulation pads 20 may be arranged sequentially along the first direction. The materials and sizes of the multiple insulation pads 20 may vary and may be selected based on actual conditions.

[0117] Optionally, the thermal insulation pad 20 and the first groove 111 can be connected by bonding, and multiple thermal insulation parts can also be connected by bonding. The bonding connection structure is simple, which can improve the assembly rate of the thermal insulation pad 20 and the first groove 111, and further improve the assembly rate of the battery module 100.

[0118] In this embodiment, a thermal insulation pad 20 is provided in the space of the thermal insulation pad 20, which can reduce the assembly steps of the battery module 100 and help improve the assembly rate of the battery module 100; by providing multiple thermal insulation pads 20, thermal insulation pads 20 of different materials or sizes can be selected according to actual conditions, so that the thermal insulation effect of the thermal insulation pad 20 can be further improved.

[0119] According to some embodiments of the present application, as shown in FIG. 13 to FIG. 15 , surfaces of the two first shell walls 11 facing each other in the first direction are inner surfaces, and the first groove 111 is formed on the inner surfaces of the first shell walls 11 .

[0120] Specifically, the inner surface of the first shell wall 11 refers to a side surface facing the accommodating cavity of the battery cell 10 , wherein the first groove 111 is formed on the inner surface of the first shell wall 11 , thereby the thermal insulation pad 20 is placed in the accommodating cavity.

[0121] In this embodiment, the surfaces of the two first shell walls 11 facing each other in the first direction are set as inner surfaces, and the first groove 111 is formed on the inner surface of the first shell wall 11, so that the thermal insulation pad 20 is directly placed in the accommodating cavity of the battery cell 10. Therefore, when the battery cell 10 has thermal runaway, the high-temperature and high-pressure material can be directly isolated from the shell, thereby further reducing the risk of the shell being melted, and further reducing the risk of heat and high-temperature and high-pressure material diffusing to other battery cells 10 and causing damage to other battery cells 10.

[0122] According to some embodiments of the present application, the number of the first grooves 111 on the first shell wall 11 is one or more, and the plurality of first grooves 111 are arranged at intervals on the first shell wall 11 .

[0123] For example, the number of the first grooves 111 may be one, two, three or more.

[0124] It is understandable that when thermal runaway occurs in the battery cell 10 , heat flow moves in the battery cell 10 accommodating cavity, thereby causing different amounts of heat transferred to the first shell wall 11 , resulting in different heating zones in the first shell wall 11 .

[0125] Among them, the sizes of multiple first grooves 111 can be different. Specifically, the size of the first groove 111 is related to the size of the thermal insulation pad 20. The sizes of multiple first grooves 111 can be different. Therefore, the sizes of multiple first grooves 111 can be designed according to the heating area of ​​the first shell wall 11, thereby further increasing the thermal insulation effect between the two connected battery cells 10 and further reducing the heat diffusion between the two adjacent battery cells 10.

[0126] In this embodiment, by setting the number of first grooves 111 on the first shell wall 11 to one or more, the sizes of the first grooves 111 and the thermal insulation pad 20 arranged in the first grooves 111 can be designed according to the heating area of ​​the first shell wall 11, thereby further increasing the thermal insulation effect between two adjacent battery cells 10 and further reducing the heat diffusion between two adjacent battery cells 10.

[0127] According to some embodiments of the present application, the first groove 111 is a circular groove, an elliptical groove, or a polygonal groove.

[0128] It can be understood that the first groove 111 can be a circular groove; it can also be an elliptical groove; it can also be a polygonal groove, wherein the polygonal groove can include multiple types, for example, it can be a quadrilateral groove, such as a rectangular groove, a diamond groove, or it can be a pentagonal groove, such as a trapezoidal groove.

[0129] In this embodiment, by setting the first groove 111 to be a circular groove, an elliptical groove or a polygonal groove, the shape of the first groove 111 can be selected according to actual conditions, thereby improving flexibility of use; at the same time, the circular groove, the elliptical groove or the polygonal groove has a simple structure and is easy to manufacture, thereby reducing the difficulty of manufacturing the first groove 111 and improving the manufacturing rate of the first shell wall 11.

[0130] According to some embodiments of the present application, the distance between the periphery of the first groove 111 and the periphery of the first shell wall 11 is greater than or equal to 0.5 mm.

[0131] For example, the distance between the periphery of the first groove 111 and the periphery of the first shell wall 11 may be 0.5 mm, 0.6 mm, 0.8 mm, 1.0 mm, 2 mm, etc.

[0132] Specifically, the first shell wall 11 is a wall of the shell of the battery cell 10. The two adjacent side walls of the shell are generally connected by an arc, which can reduce the stress at the connection and improve the structural strength of the entire shell. Therefore, the distance between the periphery of the first groove 111 and the periphery of the first shell wall 11 is greater than or equal to 0.5 mm, which allows the first groove 111 to avoid the weak point of the first shell wall 11, ensure the structural strength of the entire shell, effectively reduce the risk of cracking between the two adjacent walls, and improve the reliability of the battery cell 10.

[0133] In this embodiment, by setting the distance between the periphery of the first groove 111 and the periphery of the first shell wall 11 to be greater than or equal to 0.5 mm, the first groove 111 can avoid the weak points of the first shell wall 11, thereby ensuring the structural strength of the entire shell and effectively reducing the risk of cracking between two adjacent walls, thereby improving the reliability of the battery cell 10.

[0134] According to some embodiments of the present application, as shown in Figures 20-21, in the length direction or width direction of the first shell wall 11, the ratio of the distance between the periphery of the first groove 111 and the periphery of the first shell wall 11 to the size of the first shell wall 11 is 1 / 600 to 1 / 3.

[0135] It can be understood that, in some specific embodiments, in the length direction of the first shell wall 11, the ratio of the distance between the periphery of the first groove 111 and the periphery of the first shell wall 11 to the size of the first shell wall 11 is 1 / 600 to 1 / 3; in other specific embodiments, in the width direction of the first shell wall 11, the ratio of the distance between the periphery of the first groove 111 and the periphery of the first shell wall 11 to the size of the first shell wall 11 is 1 / 600 to 1 / 3.

[0136] For example, in the length direction of the first shell wall 11, the distance between the periphery of the first groove 111 and the periphery of the first shell wall 11 is a1, the size of the first shell wall 11 in the length direction is b1, and in the width direction of the first shell wall 11, the distance between the periphery of the first groove 111 and the periphery of the first shell wall 11 is a2, and the size of the first shell wall 11 is b2. Then the value of a1 / b1 or a2 / b2 can be 1 / 600, 1 / 60, 2 / 30, 1 / 15, 1 / 10, 2 / 15, 1 / 6, 1 / 4 or 1 / 3.

[0137] In this embodiment, the ratio of the spacing between the circumference of the first groove 111 and the circumference of the first shell wall 11 to the size of the first shell wall 11 is 1 / 600 to 1 / 3, so that the spacing between the circumference of the first groove 111 and the circumference of the first shell wall 11 will not be too small, and the first groove 111 can avoid the weak points of the first shell wall 11, thereby ensuring the structural strength of the overall shell and effectively reducing the risk of cracking between the two adjacent walls, thereby improving the reliability of the battery cell 10; it can also ensure that the spacing between the circumference of the first groove 111 and the circumference of the first shell wall 11 is not too large, thereby ensuring the installation space of the thermal insulation pad 20, so that the size of the thermal insulation pad 20 can meet the thermal insulation requirements of the two adjacent battery cells 10, reduce the area of ​​direct contact between the two adjacent battery cells 10, and thereby reduce heat diffusion and reduce the risk of damage to the adjacent battery cells 10.

[0138] According to some embodiments of the present application, the distance between the peripheral wall of the first groove 111 and the peripheral edge of the first shell wall 11 is 0.5 mm to 2 mm;

[0139] For example, the distance between the peripheral wall of the first groove 111 and the peripheral edge of the first shell wall 11 may be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.5 mm or 2 mm.

[0140] In this embodiment, the spacing between the peripheral wall of the first groove 111 and the peripheral edge of the first shell wall 11 is set to 0.5mm~2mm, so that the spacing between the peripheral wall of the first groove 111 and the peripheral edge of the first shell wall 11 will not be too small, and the first groove 111 can avoid the weak points of the first shell wall 11, thereby ensuring the structural strength of the overall shell and effectively reducing the risk of cracking between the two adjacent walls, thereby improving the reliability of the battery cell 10; it can also ensure that the spacing between the peripheral wall of the first groove 111 and the peripheral edge of the first shell wall 11 is not too large, thereby ensuring the installation space of the thermal insulation pad 20, so that the size of the thermal insulation pad 20 can meet the thermal insulation requirements of the two adjacent battery cells 10, reduce the area of ​​direct contact between the two adjacent battery cells 10, and thereby reduce heat diffusion and reduce the risk of damage to the adjacent battery cells 10.

[0141] According to some embodiments of the present application, as shown in Figures 20-21, in the length direction or width direction of the first shell wall 11, the ratio of the distance between the periphery of the first groove 111 and the periphery of the first shell wall 11 to the size of the first shell wall 11 is 1 / 150 to 1 / 30.

[0142] It can be understood that, in some specific embodiments, in the length direction of the first shell wall 11, the ratio of the distance a1 between the circumference of the first groove 111 and the circumference of the first shell wall 11 to the size b1 of the first shell wall 11 is 1 / 150 to 1 / 30; in other specific embodiments, in the width direction of the first shell wall 11, the ratio of the distance a2 between the circumference of the first groove 111 and the circumference of the first shell wall 11 to the size b2 of the first shell wall 11 is 1 / 150 to 1 / 30.

[0143] For example, the ratio of the distance between the periphery of the first groove 111 and the periphery of the first shell wall 11 to the size of the first shell wall 11 may be 1 / 150, 1 / 75, 1 / 50, 2 / 75 or 1 / 30.

[0144] In this embodiment, by being arranged in the length direction or width direction of the first shell wall 11, the ratio of the distance between the circumference of the first groove 111 and the circumference of the first shell wall 11 to the size of the first shell wall 11 is 1 / 150 to 1 / 30, so that the first groove 111 does not affect the structural strength of the battery cell shell, and can ensure the installation space of the thermal insulation pad 20, so that the size of the thermal insulation pad 20 can meet the thermal insulation requirements between adjacent battery cells 10, thereby reducing heat diffusion and reducing the risk of damage to adjacent battery cells 10.

[0145] According to some embodiments of the present application, as shown in FIG21 , a concave first groove 111 is formed on one side surface of the first shell wall 11 in the first direction, and the other side surface of the first shell wall 11 is a plane.

[0146] That is, the first shell wall 11 may have a first groove 111 formed on its inner surface and a flat outer surface, or may have a first groove 111 formed on its outer surface and a flat inner surface. The thermal insulation pad 20 fits within the first groove 111. Thus, in some embodiments, the thermal insulation pad 20 may be disposed within the accommodating cavity of the battery cell 10, while in other embodiments, the thermal insulation pad 20 may be disposed outside the battery cell 10.

[0147] It can be understood that the first groove 111 in this embodiment is formed by digging, for example, it can be made by milling rather than stamping. In this way, the first groove 111 formed on the first shell wall 11 will reduce the thickness of the first shell wall 11 at the first groove 111, thereby reducing the overall weight of the first shell wall 11 and improving the lightweight of the battery cell 10.

[0148] In this embodiment, a concave first groove 111 is formed on one side surface of the first shell wall 11 in the first direction, and the other side surface is flat, so that the influence of the first groove 111 on the energy density of the battery cell 10 can be reduced.

[0149] According to some embodiments of the present application, as shown in FIG. 21 , the ratio of the depth of the first groove 111 to the thickness of the first shell wall 11 is 1 / 6 to 5 / 6.

[0150] For example, the depth of the first groove 111 is d, and the thickness of the first shell wall 11 is h, then the value of d / h can be 1 / 6, 2 / 6, 3 / 6, 4 / 6 or 5 / 6.

[0151] In this embodiment, by setting the ratio of the depth of the first groove 111 to the thickness of the first shell wall 11 to 1 / 6 to 5 / 6, the depth of the first groove 111 can be prevented from being too deep, thereby ensuring the structural strength of the first shell wall 11; at the same time, the depth of the first groove 111 can be prevented from being too shallow, which is conducive to placing the thermal insulation pad 20 and ensuring the installation space of the thermal insulation pad 20.

[0152] According to some embodiments of the present application, as shown in FIG. 21 , the ratio of the depth of the first groove 111 to the thickness of the first shell wall 11 is 1 / 4 to 1 / 2.

[0153] For example, the ratio of the depth d of the first groove 111 to the thickness h of the first shell wall 11 may be 1 / 4, 3 / 8 or 1 / 2.

[0154] In this embodiment, by setting the ratio of the depth of the first groove 111 to the thickness of the first shell wall 11 to 1 / 4 to 1 / 2, the depth of the first groove 111 can be further reduced on the basis of meeting the installation space of the thermal insulation pad 20, thereby further increasing the structural strength of the first shell wall 11 and enhancing the protective effect of the first shell wall 11 on the battery cell 10.

[0155] According to some embodiments of the present application, as shown in FIG. 21 , the depth of the first groove 111 is 0.1 mm to 2 mm.

[0156] For example, the depth d of the first groove 111 may be 0.1 mm, 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1.0 mm, 1.5 mm, or 2 mm.

[0157] In this embodiment, the depth of the first groove 111 is set to 0.1 mm to 2 mm, so that the depth of the first groove 111 can meet the placement space of the thermal insulation pad 20 without affecting the structural strength required by the first shell wall 11, so that the first shell wall 11 can still protect the battery cell 10.

[0158] According to some embodiments of the present application, the first groove 111 is formed by stamping on the first shell wall 11 .

[0159] Among them, stamping is a forming method that relies on a press and a mold to apply external force to plates, strips, pipes and profiles to cause them to undergo plastic deformation or separation, thereby obtaining a workpiece (stamping part) of the desired shape and size.

[0160] In this embodiment, the first groove 111 is provided on the first shell wall 11 by stamping. The stamping process is simple to manufacture, thereby reducing the difficulty of producing the first groove 111 and improving the production rate of the battery cell 10. At the same time, the stamping is performed according to the mold, has high dimensional accuracy and good interchangeability, and can meet general assembly and use requirements without further mechanical processing. In addition, during the stamping process, since the surface of the material is not damaged, it has good surface quality and a smooth and beautiful appearance, which provides convenient conditions for surface treatment such as installation and welding.

[0161] According to some embodiments of the present application, the first groove 111 is formed by stamping from the outer surface toward the inner surface of the first shell wall 11 , and the depth of the first groove 111 is 2 mm to 10 mm.

[0162] It can be understood that the outer surface of the first shell wall 11 protrudes toward the inner surface, that is, the first shell wall 11 protrudes toward the accommodating cavity of the battery cell 10, and the first shell wall 11 occupies a certain internal space of the accommodating cavity of the battery cell 10, wherein the depth of the first groove 111 is the depth dimension of the first shell wall 11 extending into the accommodating cavity.

[0163] For example, the depth of the first groove 111 may be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm.

[0164] In this embodiment, a first groove 111 is formed by stamping from the outer surface of the first shell wall 11 toward the inner surface, so that the first groove 111 is formed on the outer surface of the first shell wall 11, which is beneficial to the installation of the thermal insulation pad 20; at the same time, the depth of the first groove 111 is set to 2mm~10mm, so that the depth of the first groove 111 is not too large, thereby reducing the space occupied by the first shell wall 11 in the accommodating cavity, thereby ensuring the energy density of the battery cell 10; at the same time, the depth of the first groove 111 is not too small, so that the depth can be adapted to the thermal insulation pad 20, which is convenient for the installation of the thermal insulation pad 20.

[0165] According to some embodiments of the present application, some of the multiple battery cells 10 are arranged along a second direction, which is perpendicular to the first direction. In two adjacent battery cells 10 in the second direction, the side walls of the two battery cells 10 facing each other are both second shell walls, and at least one of the two second shell walls is formed with a second groove, and a thermal insulation pad 20 is provided in the second groove.

[0166] Specifically, the plurality of battery cells 10 are arranged partially along a first direction and partially along a second direction. A first groove 111 is formed on at least one of the two first shell walls 11 in the first direction, and a second groove is formed on at least one of the two second shell walls in the second direction. In other words, a thermal insulation pad 20 is arranged between two adjacent battery cells 10 in both the first and second directions. Therefore, if thermal runaway occurs in a battery cell 10, the thermal insulation pad 20 can block heat diffusion in multiple directions, further reducing the risk of heat diffusion to other battery cells 10 and improving the reliability of the battery 1000.

[0167] Here, “at least one of the two second shell walls is formed with a second groove” can be understood as meaning that the second groove may be formed on only one of the two second shell walls, or may be formed on both second shell walls.

[0168] In this embodiment, a second groove is formed by providing at least one of the two second shell walls, and a thermal insulation pad 20 is provided in the second groove, so that when thermal runaway occurs in the battery cell 10, the thermal insulation pad 20 can block heat diffusion in multiple directions, thereby further reducing the risk of heat diffusion to adjacent battery cells 10 and improving the reliability of the battery 1000.

[0169] According to some embodiments of the present application, some of the multiple battery cells 10 are arranged along a third direction, which is perpendicular to the first direction. In two adjacent battery cells 10 in the third direction, the side walls of the two battery cells 10 facing each other are both third shell walls, and at least one of the two third shell walls is formed with a third groove, and a thermal insulation pad 20 is provided in the third groove.

[0170] Specifically, multiple battery cells 10 can be arranged partially along the first direction and partially along the third direction; or multiple battery cells 10 can be arranged partially along the first direction, partially along the second direction, and partially along the third direction; wherein the first direction, the second direction and the third direction are perpendicular to each other, at least one of the two first shell walls 11 in the first direction is formed with a first groove 111, at least one of the two second shell walls in the second direction is formed with a second groove, and at least one of the two third shell walls in the third direction is formed with a third groove, and thermal insulation pads 20 are provided in the first groove 111, the second groove and the third groove, that is, thermal insulation pads 20 are arranged between the two walls facing each other between two adjacent battery cells 10.

[0171] In this embodiment, “at least one of the two third shell walls is formed with a third groove” can be understood as meaning that the third groove can be formed on one of the two third shell walls, or grooves can be formed on both third shell walls.

[0172] In this embodiment, a third groove is formed by setting at least one of the two third shell walls, and a thermal insulation pad 20 is provided in the third groove, so that the thermal insulation pad 20 can fully cover the meltable part of the battery cell 10 shell, further reducing the risk of heat diffusion to adjacent battery cells 10, and thus improving the reliability of the battery 1000.

[0173] According to some embodiments of the present application, as shown in Figures 20 and 21, the battery cell 10 is provided with an explosion-proof valve 13 at at least one end in the third direction, and the thermal insulation pad 20 is symmetrically arranged about the explosion-proof valve 13 on a center line parallel to the first direction. In the second direction, the ratio of the size of the thermal insulation pad 20 to the size of the explosion-proof valve 13 is 1 to 30, and the first direction, the second direction and the third direction are perpendicular to each other.

[0174] It is understandable that the battery cell 10 may be provided with an explosion-proof valve 13 at one end in the third direction, or may be provided with explosion-proof valves 13 at both ends in the third direction.

[0175] Specifically, when thermal runaway occurs in the battery cell 10, high-temperature and high-pressure substances gather at the explosion-proof valve 13 and are ejected through the explosion-proof valve 13. As a result, the temperature at the explosion-proof valve 13 is relatively high, and the corresponding first shell wall 11 at the explosion-proof valve 13 melts relatively quickly.

[0176] For example, in the second direction, the size of the thermal insulation pad 20 is m1, and the size of the explosion-proof valve 13 is m2, then m1 / m2 can be 1, 5, 10, 15, 20, 25 or 30.

[0177] In this embodiment, the ratio of the size of the thermal insulation pad 20 to the size of the explosion-proof valve 13 in the second direction is 1 to 30, so that the size of the thermal insulation pad 20 is not too small, and the size of the thermal insulation pad 20 arranged on the first shell wall 11 in the second direction can completely cover the size of the explosion-proof valve 13. As a result, the thermal insulation pad 20 can cover the easily fusible part of the first shell wall 11, thereby reducing the high-temperature and high-pressure substances discharged through the melted part of the first shell wall 11 and reducing the risk of heat diffusion to other battery cells 10; at the same time, the size of the thermal insulation pad 20 is not too large, so that the size of the thermal insulation pad 20 in the second direction can meet the insulation requirements while reducing the material usage of the thermal insulation pad 20, thereby reducing the production cost of the thermal insulation pad 20.

[0178] According to some embodiments of the present application, as shown in FIG. 21 , in the second direction, the ratio of the size of the thermal insulation pad 20 to the size of the explosion-proof valve 13 is 1.5-10.

[0179] For example, in the second direction, the ratio of the size m1 of the thermal insulation pad 20 to the size m2 of the explosion-proof valve 13 may be 1.5, 2, 3, 4, 5, 6, 7, 8, 9 or 10.

[0180] In this embodiment, by setting the ratio of the size of the thermal insulation pad 20 to the size of the explosion-proof valve 13 in the second direction to 1.5 to 10, the size of the thermal insulation pad 20 in the second direction can completely cover the size of the explosion-proof valve 13 and the easily fusible portion of the first shell wall 11, thereby reducing the high-temperature and high-pressure substances discharged through the molten portion of the first shell wall 11, and further reducing the risk of heat diffusion to other battery cells 10; at the same time, it can also reduce the material usage of the thermal insulation pad 20, thereby reducing the production cost of the thermal insulation pad 20.

[0181] According to some embodiments of the present application, the battery cell 10 is provided with an explosion-proof valve 13 at at least one end in the third direction. In the direction gradually away from the explosion-proof valve 13 in the third direction, the width of the first groove 111 in the second direction remains unchanged or gradually decreases, and the first direction, the second direction and the third direction are perpendicular to each other.

[0182] It is understandable that the battery cell 10 may be provided with the explosion-proof valve 13 only at one end in the third direction, or may be provided with the explosion-proof valve 13 at both ends in the third direction.

[0183] In some specific embodiments, the width of the first groove 111 in the second direction remains unchanged as the third direction gradually moves away from the explosion-proof valve 13; in other specific embodiments, the width of the first groove 111 in the second direction gradually decreases as the third direction gradually moves away from the explosion-proof valve 13.

[0184] Specifically, when thermal runaway occurs in the battery cell 10, the high-temperature gas will move along the exhaust space inside the battery cell 10 to the explosion-proof valve 13, gather and discharge the high-temperature gas through the explosion-proof valve 13. As a result, the temperature at the position of the explosion-proof valve 13 is relatively high, and the temperature away from the position of the explosion-proof valve 13 is relatively low. Furthermore, in the direction of gradually moving away from the explosion-proof valve 13 in the third direction, the width of the first groove 111 in the second direction remains unchanged, so that the thermal insulation pad 20 can meet the thermal insulation requirements between adjacent battery cells 10; the width of the first groove 111 in the second direction gradually decreases, so that the thermal insulation pad 20 can reduce the use area of ​​the thermal insulation pad 20 while being able to meet the thermal insulation requirements between adjacent battery cells 10, thereby reducing the production cost of the battery module 100; at the same time, the area occupied by the first groove 111 on the first shell wall 11 can also be reduced, thereby improving the structural strength of the first shell wall 11.

[0185] In this embodiment, the width of the first groove 111 in the second direction remains unchanged as it moves gradually away from the explosion-proof valve 13 in the third direction, so that the thermal insulation pad 20 can meet the thermal insulation requirements between adjacent battery cells 10, thereby reducing the difficulty of manufacturing the first groove 111; the width of the first groove 111 in the second direction gradually decreases as it moves gradually away from the explosion-proof valve 13 in the third direction, so that the thermal insulation pad 20 can reduce the usage area of ​​the thermal insulation pad 20 while still meeting the thermal insulation requirements between adjacent battery cells 10, thereby reducing the production cost of the battery module 100; at the same time, the area occupied by the first groove 111 on the first shell wall 11 can also be reduced, thereby improving the structural strength of the first shell wall 11.

[0186] According to some embodiments of the present application, as shown in FIG21 , the thickness of the thermal insulation pad 20 is 0.5 mm to 3 mm.

[0187] For example, the thickness f of the thermal insulation pad 20 may be 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, or 3 mm.

[0188] This embodiment sets the thickness of the thermal insulation pad 20 to 0.5mm to 3mm, ensuring that the thickness of the thermal insulation pad 20 is not too small. This helps the thermal insulation pad 20 meet the thermal insulation requirements between battery cells 10. In this way, when a battery cell 10 experiences thermal runaway, the heat transferred to adjacent battery cells 10 can be effectively reduced, reducing heat diffusion and thus reducing the risk of damage to adjacent battery cells 10. At the same time, the thickness of the thermal insulation pad 20 is not too large, thereby reducing the space occupied by the thermal insulation pad 20 in the battery module 100. This allows the battery module 100 to stack more battery cells 10 within the same size, thereby improving the energy density of the battery 100.

[0189] According to some embodiments of the present application, as shown in FIG21 , the thickness of the thermal insulation pad 20 is 0.8 mm to 2.5 mm.

[0190] For example, the thickness f of the thermal insulation pad 20 may be 0.8 mm, 0.9 mm, 1.0 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2.0 mm, or 2.5 mm.

[0191] In this embodiment, by setting the thickness of the thermal insulation pad 20 to 0.8mm to 2.5mm, the thickness of the thermal insulation pad 20 can not only meet the thermal insulation requirements between the battery cells 10, but also further reduce the space occupied by the thermal insulation pad 20, thereby further improving the energy density of the battery 1000.

[0192] In some specific embodiments, the battery module 100 further includes a longitudinal beam 30 , which is used to fix the plurality of battery cells 10 so as to assemble the battery cells 10 into the battery module 100 .

[0193] The battery 1000 according to the second aspect of the present application includes the battery module 100 according to the first aspect of the present application.

[0194] In some specific embodiments of the present application, such as shown in Figure 3, the battery 1000 may further include: a main box 201 and a cover plate 202, the main box 201 has a cavity with an open top, a plurality of battery cells 10 are arranged in the cavity, and the cover plate 202 is sealed on the top of the main box 201 by fasteners.

[0195] Optionally, a plurality of battery cells 10 may be stacked and arranged in the cavity along a thickness direction of the battery cells 10 .

[0196] Optionally, the main box 201 is formed in the shape of a rectangular box body, the inner side of the main box 201 defines a cavity, the top of the cavity is open, the main box 201 is provided with a plurality of first fixing holes, the cover plate 202 is formed in the shape of a horizontally arranged flat plate, the cover plate 202 is provided with a plurality of second fixing holes that pass through the cover plate 202 in the up and down directions, the plurality of first fixing holes correspond one to one with the plurality of second fixing holes and are opposite to each other up and down, the battery 1000 also includes a plurality of fasteners, and the plurality of fasteners pass through the first fixing holes and the second fixing holes to fasten the cover plate 202 to the upper side of the main box 201.

[0197] Optionally, the cover plate 202 may be a carbon steel plate, an aluminum plate, or a composite material plate.

[0198] This embodiment facilitates the installation of the battery cells 10 into the box body 200 by configuring the box body 200 to include a main box 201 and a cover plate 202 arranged separately. The main box 201 and the cover plate 202 are connected by fasteners to achieve a detachable connection, which is convenient for maintenance and replacement, and can ensure the connection strength between the main box 201 and the cover plate 202, thereby ensuring the overall structural strength of the battery 1000.

[0199] In some specific embodiments of the present application, a first adhesive layer is provided on the bottom wall of the cavity, and the bottoms of the multiple battery cells 10 are connected to the bottom wall of the main box 201 through the first adhesive layer; and / or, a second adhesive layer is provided on the cover plate 202, and the tops of the multiple battery cells 10 are connected to the cover plate 202 through the second adhesive layer.

[0200] The battery 1000 may include only the first adhesive layer, or only the second adhesive layer, or may include both the first adhesive layer and the second adhesive layer. The first adhesive layer is used to adhesively connect the bottom wall of the main box 201 and the battery cell 10, and the second adhesive layer is used to adhesively connect the cover plate 202 and the battery cell 10, so as to reliably fix multiple battery cells 10 in the box body 200, improve the reliability and stability of the connection between the battery cell 10 and the box body 200, and prevent the battery cell 10 from shaking in the box body 200.

[0201] In this embodiment, a first adhesive layer and a second adhesive layer are provided, and the bottom of the battery cell 10 is bonded and fixed to the bottom wall of the main box 201 through the first adhesive layer, and the top of the battery cell 10 is bonded and fixed to the cover plate 202 through the second adhesive layer. In this way, the overall strength of the battery 1000 can be improved and the connection stability of the battery cell 10 can be ensured.

[0202] According to the battery 1000 of the present application, the overall performance of the battery 1000 is improved by providing the battery module 100 according to the first aspect.

[0203] The electrical device according to the third aspect of the present application includes the battery 1000 according to the second aspect of the present application, and the battery 1000 is used to provide electrical energy.

[0204] According to the electric device of the present application, the battery 1000 of the second aspect is provided, thereby improving the overall performance of the electric device.

[0205] The battery module 100 according to five specific embodiments of the present application will be described below with reference to FIG. 5 to FIG. 21 .

[0206] Example 1:

[0207] 5 , the battery module 100 includes a plurality of battery cells 10, thermal insulation pads 20, and longitudinal beams 30. The battery cells 10 are arranged flat, with their thicknesses extending vertically. The battery cells 10 are stacked in two layers in the vertical direction. The thermal insulation pads 20 are positioned between two battery cells 10 arranged vertically to isolate them and reduce heat transfer between adjacent battery cells 10.

[0208] Specifically, the opposing sidewalls of the two battery cells 10 are each formed as a first shell wall 11. The first shell wall 11 includes an outer surface and an inner surface. The surfaces of the two first shell walls 11 facing each other are the outer surface, and the surfaces of the two first shell walls 11 facing each other are the inner surface. Both first shell walls 11 are formed with a first groove 111. The first groove 111 is formed on the outer surface of the first shell wall 11, and the inner surface of the first shell wall 11 is flat. The two first grooves 111 are identical in size and location. Vertically, the two first grooves 111 communicate with each other and define a thermal insulation space, within which the thermal insulation pad 20 is disposed.

[0209] Furthermore, the distance between the peripheral wall of the first groove 111 and the peripheral edge of the first shell wall 11 is 0.5 mm to 2 mm, the depth of the first groove 111 is 0.1 mm to 2 mm, and the thickness of the thermal insulation pad 20 is 0.8 mm to 2.5 mm.

[0210] Furthermore, two battery cells 10 arranged one above the other form a group, and multiple groups of battery cells 10 are arranged in sequence along the front and back, wherein the length direction of the battery cells 10 is the front and back direction.

[0211] The battery cell 10 also includes a terminal 12 and an explosion-proof valve 13. The terminal 12 is located on one side of the battery cell 10 in the width direction, and the explosion-proof valve 13 is located on the other side of the battery cell 10 in the width direction. The longitudinal beam 30 is located on the side of the battery cell 10 where the explosion-proof valve 13 is located to secure the multiple battery cells 10. The width direction of the battery cell 10 is the left-right direction.

[0212] When thermal runaway occurs in the battery cell 10, the heat will first be transferred to the first shell wall 11, and then transferred to the thermal insulation pad 20 through the first shell wall 11. Compared with the first shell wall 11, the thermal insulation pad 20 can withstand higher temperatures. Therefore, even if the first shell wall 11 is partially melted due to high-temperature and high-pressure substances, the thermal insulation pad 20 can cover at least a part of the melted part of the first shell wall 11 to reduce the high-temperature and high-pressure substances discharged through the melted part of the first shell wall 11, reduce the risk of heat diffusion to other battery cells 10, and improve the reliability of the battery 1000.

[0213] According to the battery module 100 of the embodiment of the present application, by forming a first groove 111 on the first shell wall 11 and arranging the thermal insulation pad 20 in the first groove 111, the space occupied by the thermal insulation pad 20 between two adjacent battery cells 10 can be reduced. Therefore, when the size of the battery module 100 is certain, more battery cells 10 can be arranged, thereby improving the energy density of the battery 1000.

[0214] Example 2:

[0215] 14 , the structure of this embodiment is substantially the same as that of the first embodiment, wherein the same components are designated by the same reference numerals, and the only difference is that the first groove 111 described in the first embodiment is formed on the outer surface of the first shell wall 11, while the first groove 111 described in the second embodiment is formed on the inner surface of the first shell wall 11.

[0216] Specifically, there are two first grooves 111, both formed on the inner surface of the first shell wall 11, and the outer surface of the first shell wall 11 is formed into a plane. There are two thermal insulation pads 20, and the two thermal insulation pads 20 are respectively pasted in the two first grooves 111 to cover the inner surface of the first shell wall 11, reducing the impact of high-temperature and high-pressure materials on the first shell wall 11, thereby reducing the risk of the first shell wall 11 being melted.

[0217] Example 3,

[0218] 16 , the structure of this embodiment is substantially the same as that of the first embodiment, wherein the same reference numerals are used for the same components, and the only difference is that the first shell wall 11 described in the first embodiment is the two side walls oppositely disposed between two upper and lower adjacent battery cells 10, while the first shell wall 11 described in the third embodiment is the two side walls oppositely disposed between two front and rear adjacent battery cells 10.

[0219] Specifically, multiple battery cells 10 are arranged in sequence along the front-to-back direction of the battery cells 10, and the first groove 111 is formed on the two side walls of the battery cells 10 in the front-to-back direction. The thermal insulation pad 20 is used to isolate the two adjacent battery cells 10 in the front and back direction to reduce heat transfer between the two adjacent battery cells 10 in the front-to-back direction.

[0220] Example 4:

[0221] 18 and 19 , the structure of this embodiment is substantially the same as that of the first embodiment, wherein the same components are designated by the same reference numerals, and the only difference is that the first shell wall 11 described in the first embodiment is two side walls of two upper and lower adjacent battery cells 10 arranged opposite to each other, while the first shell wall 11 described in the fourth embodiment is two side walls of two left and right adjacent battery cells 10 arranged opposite to each other.

[0222] Specifically, multiple battery cells 10 are stacked in two layers in the up-down direction, and multiple battery cells 10 are arranged in sequence in the front-to-back direction to form a battery module 100. Multiple battery modules 100 are arranged side by side in the left-to-right direction and connected to each other to form a battery 1000, wherein the pole 12 of the battery cell 10 is arranged at the left end of the battery cell 10, and the explosion-proof valve 13 of the battery cell 10 is arranged at the right end of the battery cell 10. Thus, the first groove 111 is formed on one side of the pole 12 or one side of the explosion-proof valve 13, which can effectively isolate the heat spread between two adjacent battery modules 100.

[0223] Example 5,

[0224] The structure of this embodiment is substantially the same as that of the first embodiment, wherein the same components are designated by the same reference numerals. The only difference is that the battery cell 10 described in the first embodiment is only formed with the first groove 111 , while the battery cell 10 described in the fifth embodiment is also formed with the second groove.

[0225] Specifically, two battery cells 10 arranged vertically form a group, and multiple groups of battery cells 10 are arranged in sequence along the front and back, wherein two first grooves 111 are formed on two first shell walls 11 of the two battery cells 10 arranged vertically and oppositely, and two second grooves are formed on two second shell walls of two adjacent battery cells arranged oppositely in the front and back, and thermal insulation pads 20 are arranged in both the first grooves 111 and the second grooves. In this way, when thermal runaway occurs in the battery cell 10, the thermal insulation pad 20 can block the spread of heat in multiple directions, thereby further reducing the risk of heat diffusion to adjacent battery cells 10, thereby improving the reliability of the battery 1000.

[0226] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery module, comprising: a plurality of battery cells, at least part of the plurality of battery cells are arranged in sequence along a first direction. Among two adjacent battery cells in the first direction, the side walls of the two battery cells arranged facing each other are both first shell walls (11), and at least one of the two first shell walls (11) is formed with a first groove (111); a heat insulation pad (20), at least part of the heat insulation pad (20) is disposed in the first groove (111).

2. The battery module according to claim 1, wherein, The surfaces of the two first shell walls (11) facing each other in the first direction are outer surfaces, and the first groove (111) is formed on the outer surface of the first shell wall (11).

3. The battery module according to claim 2, wherein, The first grooves (111) are formed on both of the two first shell walls (11), and both of the two first grooves (111) are formed on the outer surface of the first shell wall (11). The two first grooves (111) are communicated and cooperate to define a heat insulation space, and the heat insulation pad (20) is disposed in the heat insulation space.

4. The battery module according to claim 3, wherein One heat insulation pad (20) is disposed in the heat insulation space; or, a plurality of heat insulation pads (20) are disposed in the heat insulation space.

5. The battery module according to any one of claims 1-4, wherein The surfaces of the two first shell walls (11) facing away from each other in the first direction are inner surfaces, and the first groove (111) is formed on the inner surface of the first shell wall (11).

6. The battery module according to any one of claims 1-5, wherein, The number of the first grooves (111) on the first shell wall (11) is one or more, and the plurality of first grooves (111) are arranged at intervals on the first shell wall (11).

7. The battery module according to any one of claims 1-6, wherein, The first groove (111) is a circular groove, an elliptical groove or a polygonal groove.

8. The battery module according to any one of claims 1-7, wherein The distance between the peripheral edge of the first groove (111) and the peripheral edge of the first shell wall (11) is greater than or equal to 0.5 mm; and / or, in the length direction or width direction of the first shell wall (11), the ratio of the distance between the peripheral edge of the first groove (111) and the peripheral edge of the first shell wall (11) to the size of the first shell wall (11) is 0.5 / 300 - 100 / 300.

9. The battery module according to claim 8, wherein, The distance between the peripheral wall of the first groove (111) and the peripheral edge of the first shell wall (11) is 0.5 mm - 2 mm; and / or, in the length direction or width direction of the first shell wall (11), the ratio of the distance between the peripheral edge of the first groove (111) and the peripheral edge of the first shell wall (11) to the size of the first shell wall (11) is 2 / 300 - 10 / 300.

10. The battery module according to any one of claims 1-9, wherein, The first groove (111) which is recessed is formed on one side surface of the first shell wall (11) in the first direction, and the other side surface of the first shell wall (11) is a plane.

11. The battery module according to claim 10, wherein, The ratio of the depth of the first groove (111) to the thickness of the first shell wall (11) is 1 / 6 - 5 / 6.

12. The battery module according to claim 11, wherein, The ratio of the depth of the first groove (111) to the thickness of the first shell wall (11) is 1 / 4 - 1 / 2.

13. The battery module according to any one of claims 10-12, wherein, The depth of the first groove (111) is 0.1 mm - 2 mm.

14. The battery module according to any one of claims 1 to 13, wherein, The first groove (111) is formed by stamping on the first shell wall (11).

15. The battery module according to claim 14, wherein, The first groove (111) is formed by stamping from the outer surface to the inner surface of the first housing wall (11), and the depth of the first groove (111) is 2 mm to 10 mm.

16. The battery module according to any one of claims 1 to 15, wherein, Some of the plurality of battery cells are arranged in a second direction perpendicular to the first direction. Among two adjacent battery cells in the second direction, the side walls of the two battery cells facing each other are both second housing walls, and at least one of the two second housing walls is formed with a second groove, and the heat insulation pad (20) is disposed in the second groove.

17. The battery module according to any one of claims 1-16, wherein, Some of the plurality of battery cells are arranged in a third direction perpendicular to the first direction. Among two adjacent battery cells in the third direction, the side walls of the two battery cells facing each other are both third housing walls, and at least one of the two third housing walls is formed with a third groove, and the heat insulation pad (20) is disposed in the third groove.

18. The battery module according to any one of claims 1-17, wherein, An explosion-proof valve (13) is provided at at least one end of the battery cell in the third direction. The heat insulation pad (20) is symmetrically arranged about the explosion-proof valve (13) with respect to the center line parallel to the first direction. In the second direction, the ratio of the size of the heat insulation pad (20) to the size of the explosion-proof valve (13) is 1 to 30, and the first direction, the second direction, and the third direction are perpendicular to each other in pairs.

19. The battery module according to claim 18, wherein, In the second direction, the ratio of the size of the heat insulation pad (20) to the size of the explosion-proof valve (13) is 1.5 to 10.

20. The battery module according to any one of claims 1-19, wherein An explosion-proof valve (13) is provided at at least one end of the battery cell in the third direction. In the direction gradually away from the explosion-proof valve (13) in the third direction, the width of the first groove (111) in the second direction remains unchanged or gradually decreases, and the first direction, the second direction, and the third direction are perpendicular to each other in pairs.

21. The battery module according to any one of claims 1-20, wherein, The thickness of the heat insulation pad (20) is 0.5 mm to 3 mm.

22. The battery module according to claim 21, wherein, The thickness of the heat insulation pad (20) is 0.8 mm to 2.5 mm.

23. A battery, comprising the battery module according to any one of claims 1-22.

24. An electrical device, comprising the battery according to claim 23, wherein the battery is used to provide electrical energy.

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