Battery module, battery with same and electric device

Abstract

The utility model discloses a battery module, and a battery and an electric device with the same, the battery module comprises a plurality of battery monomers, the plurality of battery monomers are sequentially arranged along a first direction at least partially, and in two adjacent battery monomers in the first direction, the first direction of the plurality of battery monomers is at least partially parallel to the first direction, and the second direction of the plurality of battery monomers is at least partially parallel to the first direction. The oppositely arranged side walls of the two battery monomers are first shell walls, and at least one of the two first shell walls forms a first groove; and the heat insulation pad is at least partially arranged in the first groove. According to the battery module disclosed by the utility model, the first groove is formed in at least one of the two first shell walls, and the heat insulation pad is at least partially arranged in the first groove, so that the occupied space of the heat insulation pad between the two adjacent battery monomers can be reduced, and therefore, when the size of the battery module is fixed, more battery monomers can be arranged; and the energy density of the battery can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery module and a battery and an electric device having the same. Background Art

[0002] Relevant technologies point out that in order to solve the problem of damage to adjacent battery cells caused by thermal runaway of battery cells, a thermal insulation pad is currently added between two adjacent battery cells for insulation to reduce the 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 result in a loss of battery energy density. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a battery module, which can reduce the space occupied by the thermal insulation pad between two adjacent battery cells, thereby arranging more battery cells, thereby improving the energy density of the battery.

[0004] The utility model also provides a battery having the battery module.

[0005] The utility model also provides an electrical device having the battery.

[0006] According to the first aspect of the utility model, the battery module comprises: a plurality of battery cells, the plurality of battery cells are arranged in sequence at least partially 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.

[0007] According to the battery module of the present invention, by forming a first groove on at least one of the two first shell walls and disposing 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.

[0008] 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.

[0009] In this embodiment, by setting the first groove formed on the outer surface of the first shell wall, the manufacturing process of the first groove can be reduced, the production rate of the battery cell can be improved, and it is also beneficial to the installation of the thermal insulation pad, thereby improving the assembly rate of the battery module.

[0010] In some embodiments, the first grooves are formed on both of the first shell walls, and the two 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.

[0011] 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 track, thereby ensuring the thermal insulation effect of the thermal insulation pad.

[0012] In some embodiments, one of the thermal insulation pads is provided in the thermal insulation space; or, a plurality of the thermal insulation pads are provided in the thermal insulation space.

[0013] In this embodiment, a thermal insulation pad is provided in the thermal 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 thermal insulation pads, thermal insulation pads of different materials or sizes can be selected according to actual conditions, thereby further improving the thermal insulation effect of the thermal insulation pad.

[0014] In some embodiments, surfaces of the two first shell walls that are opposite to each other in the first direction are inner surfaces, and the first groove is formed on the inner surfaces of the first shell walls.

[0015] In this embodiment, by setting the surfaces of the two first shell walls opposite to each other in the first direction as inner surfaces, the first groove is formed on the inner surfaces of the first shell walls, so that the thermal insulation pad is directly placed in the accommodating cavity of the battery cell. Therefore, when thermal runaway occurs in the battery cell, 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.

[0016] 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.

[0017] 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.

[0018] In some embodiments, the first groove is a circular groove, an elliptical groove, or a polygonal groove.

[0019] 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.

[0020] In some embodiments, the spacing 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 spacing 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.

[0021] In this embodiment, by setting the spacing between the periphery of the first groove and the periphery of the first shell wall to be greater than or equal to 0.5 mm, the first groove can avoid the weak part of the first shell wall, ensure the structural strength of the overall shell, and effectively reduce the risk of cracking between two adjacent walls, thereby improving the reliability of the battery cell. By setting the ratio between the spacing between the periphery of the first groove and the periphery of the first shell wall in the length direction or width direction of the first shell wall and the size of the first shell wall to be 1 / 600 to 1 / 3, the spacing between the periphery of the first groove and the periphery of the first shell wall can be not too small, the first groove can avoid the weak part of the first shell wall, ensure the structural strength of the overall shell, and effectively reduce the risk of cracking between two adjacent walls, thereby improving the reliability of the battery cell; the spacing between the periphery of the first groove and the periphery of the first shell wall can be not too large, 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, reducing the area of ​​direct contact between two adjacent battery cells, thereby reducing heat diffusion and reducing the risk of damage to adjacent battery cells.

[0022] 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.

[0023] In this embodiment, by setting the spacing between the peripheral wall of the first groove and the peripheral edge of the first shell wall to 0.5mm~2mm, the spacing between the peripheral wall of the first groove and the peripheral edge of the first shell wall can be not 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; the spacing between the peripheral wall of the first groove and the peripheral edge of the first shell wall can be 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, reducing the area of ​​direct contact between two adjacent battery cells, thereby reducing heat diffusion and reducing 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.

[0024] In some embodiments, a concave first groove is formed on a side surface of the first shell wall in the first direction, and the other side surface of the first shell wall is a plane.

[0025] In this embodiment, a first groove is formed on one side surface of the first shell wall in the first direction, and the other side surface is a plane, so that the influence of the first groove on the energy density of the battery cell can be reduced.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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 satisfying 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.

[0030] In some embodiments, the depth of the first groove is 0.1 mm to 2 mm.

[0031] In this embodiment, the depth of the first groove is set to 0.1 mm to 2 mm, so that the depth of the first groove can meet the placement space of the thermal insulation pad and does not affect the structural strength required by the first shell wall, so that the first shell wall can still protect the battery cell.

[0032] In some embodiments, the first groove is stamped on the first shell wall.

[0033] In this embodiment, the first groove is formed by stamping on the first shell wall, wherein the stamping process is simple to manufacture, thereby reducing the difficulty of producing the first groove and increasing the production rate of the battery cell; at the same time, the stamping process is performed according to a mold, has high dimensional accuracy and good interchangeability, and does not require further machining to meet general assembly and use requirements; 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.

[0034] In some embodiments, the first groove is punched from the outer surface of the first shell wall toward the inner surface, and the depth of the first groove is 2 mm to 10 mm.

[0035] 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 beneficial 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.

[0036] In some embodiments, some of the multiple battery cells are arranged along a second direction, and the second direction 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 arranged in the second groove.

[0037] In this embodiment, at least one of the two second shell walls is provided with a second groove, and a thermal insulation pad is provided in the second groove, so that when thermal runaway occurs in the 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 the reliability of the battery.

[0038] In some embodiments, some of the multiple battery cells are arranged along a third direction, and the third direction 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 arranged in the third groove.

[0039] In this embodiment, a third groove is formed in 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.

[0040] In some embodiments, an explosion-proof valve is provided at least at one end of the battery cell in the third direction, and the thermal insulation pad is symmetrically arranged about the explosion-proof valve on 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.

[0041] 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 to 30, the size of the thermal insulation pad is not too small, so that 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 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 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.

[0042] In some embodiments, in the second direction, the ratio of the size of the thermal insulation pad to the size of the explosion-proof valve is 1.5-10.

[0043] 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 1.5-10, 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.

[0044] In some embodiments, at least one end of the battery cell in the third direction is provided with an explosion-proof valve, and in the direction of the third direction gradually away from the explosion-proof valve, the width of the first groove 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.

[0045] In this embodiment, by keeping the width of the first groove in the second direction unchanged as it moves away from the explosion-proof valve in the third direction, the thermal insulation pad can meet the thermal insulation requirements between adjacent battery cells and reduce the difficulty of making the first groove. By gradually reducing the width of the first groove in the second direction as it moves away from the explosion-proof valve in the third direction, the thermal insulation pad can reduce the usage area of ​​the thermal insulation pad while 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.

[0046] In some embodiments, the thickness of the thermal insulation pad is 0.5 mm to 3 mm.

[0047] In this embodiment, the thickness of the thermal insulation pad is set to 0.5mm to 3mm, so that the thickness of the thermal insulation pad is not too small, which is conducive to the thermal insulation pad meeting the thermal insulation requirements between battery cells. In this way, when a battery cell has thermal runaway, the heat transferred to the adjacent battery cell can be effectively reduced, reducing heat diffusion, thereby reducing the risk of adjacent battery cells being damaged. At the same time, the thickness of the thermal insulation pad is not too large, thereby reducing the space occupied by the thermal insulation pad in the battery module, so that the battery module can stack more battery cells in the same size, thereby improving the energy density of the battery.

[0048] In some embodiments, the thickness of the thermal insulation pad is 0.8 mm to 2.5 mm.

[0049] In this embodiment, by setting the thickness of the thermal insulation pad to 0.8 mm to 2.5 mm, 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.

[0050] A battery according to a second aspect of the present invention includes a battery module according to the first aspect of the present invention.

[0051] According to the battery of the utility model, the battery module of the first aspect is provided, thereby improving the overall performance of the battery.

[0052] The electrical device according to the third aspect of the utility model comprises the battery according to the second aspect of the utility model, and the battery is used to provide electrical energy.

[0053] According to the electric device of the utility model, the battery of the second aspect is provided, thereby improving the overall performance of the electric device.

[0054] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 is a schematic diagram of a vehicle according to an embodiment of the utility model;

[0056] Figure 2 is a schematic diagram of a battery according to an embodiment of the utility model;

[0057] Figure 3 is an exploded diagram of a battery according to an embodiment of the utility model;

[0058] Figure 4 is a partial schematic diagram of a battery according to an embodiment of the utility model;

[0059] Figure 5 is a schematic diagram of a battery module according to an embodiment of the utility model;

[0060] Figure 6 yes Figure 5 A partial schematic diagram of a battery module shown in ;

[0061] Figure 7 yes Figure 5 A partial cross-sectional view of a battery module shown in ;

[0062] Figure 8 yes Figure 5 A schematic diagram of a battery cell shown in ;

[0063] Fig. 9 yes Figure 5 A schematic diagram of a battery cell from another angle shown in ;

[0064] Fig.10 yes Figure 5 A schematic diagram of the battery cell shown in another angle;

[0065] Fig.11 yes Figure 5 A schematic diagram of a battery cell at another angle shown in FIG.

[0066] Fig.12 yes Figure 5 Schematic diagrams of other angles of the battery cell shown in ;

[0067] Fig.13 is a schematic diagram of a battery module according to another embodiment of the utility model;

[0068] Fig.14 yes Fig.13 A partial schematic diagram of a battery module shown in ;

[0069] Fig.15 yes Fig.13 A schematic diagram of a battery cell shown in ;

[0070] Fig.16 is a schematic diagram of a battery module according to another embodiment of the utility model;

[0071] Fig.17 yes Fig.13 A schematic diagram of a battery cell shown in ;

[0072] Fig.18 is a schematic diagram of another battery cell;

[0073] Fig.19 is a schematic diagram of another battery cell;

[0074] Fig. 20 It is a cross-sectional view of a battery cell at one angle;

[0075] Fig.21 This is a cross-sectional view of a battery cell from another angle.

[0076] Reference numerals:

[0077] 1. Vehicles;

[0078] 1000. Battery;

[0079] 100. Battery module;

[0080] 10. Battery cell; 11. First shell wall; 111. First groove; 12. Terminal column; 13. Explosion-proof valve;

[0081] 20. Insulation pad; 30. Stringer;

[0082] 200, box body; 201, main box; 202, cover plate;

[0083] 2000, controller; 3000, motor. DETAILED DESCRIPTION

[0084] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0085] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by technicians in the technical field to which the present invention belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" in the specification and claims of the present invention and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0086] In the description of the embodiments of the present utility model, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present utility model, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0087] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0088] In the description of the embodiments of the present utility model, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0089] In the description of the embodiments of the present invention, the term "plurality" refers to more than two (including two).

[0090] In the description of the embodiments of the present invention, 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. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0091] In the description of the embodiments of the present utility model, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0092] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0093] During the operation of the power battery, the battery cell may experience thermal runaway due to unexpected conditions such as short circuits. When thermal runaway occurs in the battery cell, the internal pressure and temperature of the battery cell will rise rapidly, and high-temperature and high-pressure substances will be generated inside the battery cell. These high-temperature and high-pressure substances will flow in the battery cell's accommodating cavity and be discharged through the battery cell's explosion-proof valve. The explosion-proof valve needs to discharge high-temperature and high-pressure gas to the outside for a certain period of time. During this period of time, the high-temperature and high-pressure gas inside the shell will act on the shell wall to soften it or even melt it. When the shell is softened or melted by the high-temperature and high-pressure substance, the high-temperature and high-pressure substance may break through the shell and discharge to the outside of the shell. The high-temperature and high-pressure substance discharged through the shell spreads to other battery cells, which is easy to cause the risk of thermal runaway of other battery cells.

[0094] In order to solve the problem of damage to adjacent battery cells caused by thermal runaway of battery cells, a thermal insulation pad is 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 result in a loss of battery energy density.

[0095] 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 opposite to 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.

[0096] 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. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0097] 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 utility model.

[0098] Reference Figure 1 , Figure 1 Schematic diagram of vehicle 1 provided for some embodiments of the utility model. Vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 1000 is arranged inside the vehicle 1, and the battery 1000 may be arranged at the bottom, head or tail of the vehicle 1. The battery 1000 may be used to power the vehicle 1, for example, the battery 1000 may be used as an operating power source for the vehicle 1. The vehicle 1 may also include a controller 2000 and a motor 3000, and the controller 2000 is used to control the battery 1000 to power the motor 3000, for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.

[0099] In some embodiments of the present application, the battery 1000 can not only serve as an operating power source for the vehicle 1 , but also serve 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 .

[0100] Reference Figure 2-Figure 4 , Figure 2 Schematic diagram of a battery 1000 according to some embodiments of the present invention. Figure 3 1 is an exploded view of a battery 1000 according to some embodiments of the present invention. Figure 4The figure is a partial schematic diagram of a battery 1000 in some embodiments of the utility model. The battery 1000 includes a box 200 and a battery cell 10, the box 200 has a cavity, and the battery cell 10 is accommodated in the cavity of the box 200. Among them, the box 200 is used to provide a storage space for the battery cell 10, and the box 200 can adopt a variety of structures. In some embodiments, the box 200 may 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 jointly define a storage space for accommodating the battery cell 10. The second part may be a hollow structure with one end open, the first part may be a plate-like structure, the first part covers the open side of the second part, so that the first part and the second part jointly define a storage space; the first part and the second part may also be hollow structures with one side open, and the open side of the first part covers the open side of the second part. Of course, the box 200 formed by the first part and the second part can be a variety of shapes, such as a cylinder, a cuboid, etc.

[0101] 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 mixed connection. A mixed connection means that the multiple battery cells 10 are both connected in series and in parallel. The multiple battery cells 10 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 10 is accommodated in the box 200; of course, the battery 1000 may also be a battery module 100 in the form of multiple battery cells 10 connected in series, in parallel, or in a mixed connection, and then the multiple battery modules 100 are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 200. The battery 1000 may also include other structures, for example, the battery 1000 may also include a busbar component for realizing electrical connection between the multiple battery cells 10.

[0102] Each battery cell 10 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 10 may be cylindrical, flat, rectangular, or in other shapes.

[0103] Reference below Figure 5-Figure 21 A battery module 100 according to an embodiment of the first aspect of the present invention is described. Figure 5 is a schematic diagram of a battery module 100 according to an embodiment of the present utility model. Figure 6 yes Figure 5 A partial schematic diagram of a battery module 100 is shown in FIG. Figure 7 yes Figure 5 A partial cross-sectional view of a battery module 100 is shown in FIG. Figure 8 yes Figure 6 A schematic diagram of a battery cell 10 is shown in FIG. Fig. 9 yes Figure 5 A schematic diagram of the battery cell 10 from another angle is shown in FIG. Fig.10 yes Figure 5 A schematic diagram of the battery cell 10 at another angle is shown in FIG. Fig.11 yes Figure 5 A schematic diagram of the battery cell 10 at another angle is shown in FIG. Fig.12 yes Figure 5 Schematic diagrams of the battery cell 10 from other angles shown in FIG. Fig.13 is a schematic diagram of a battery module 100 according to another embodiment of the present invention. Fig.14 yes Fig.13 A partial schematic diagram of a battery module 100 is shown in FIG. Fig.15 yes Fig.13 A schematic diagram of a battery cell 10 is shown in FIG. Fig.16 is a schematic diagram of a battery module 100 according to another embodiment of the present utility model. Fig.17 yes Fig.16 A schematic diagram of a battery cell 10 is shown in FIG. Fig.18 is a schematic diagram of another battery cell 10, Fig.19 is a schematic diagram of another battery cell 10, Fig. 20 is a cross-sectional view of a battery cell 10 at one angle. Fig.21 It is a cross-sectional view of the battery cell 10 at another angle.

[0104] The present utility model embodiment provides a battery module 100, such as Figure 5 As shown, it includes: a plurality of battery cells 10 and a thermal insulation pad 20, 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.

[0105] Among them, "a plurality of battery cells 10 are at least partially arranged in sequence along the first direction" can be understood as that a plurality of battery cells 10 can be partially arranged in sequence along the first direction, or can be arranged in sequence along the first direction to form a battery module 100. Specifically, a plurality of battery cells 10 are mainly used to store and release energy, and are core components of the battery 1000. The number of battery cells 10 can be selected according to the space conditions of the battery case 200, and the length is flexible and variable, which can meet the use of batteries 1000 of different sizes. For example, the number of battery cells 10 can be two, three or more.

[0106] The thermal insulation pad 20 has high high temperature resistance and corrosion resistance, and is mainly used to reduce heat transfer between battery cells 10. When a battery cell 10 has thermal runaway, the thermal insulation pad 20 can prevent the thermal runaway from aggravating and reduce the impact of the thermal runaway of the battery cell 10 on the adjacent battery cell 10. The thermal insulation pad 20 can be made of a variety of materials, for example, mica board, epoxy board, ceramic and other materials can be used.

[0107] 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 .

[0108] “The thermal insulation pad 20 is at least partially disposed in the first groove 111” It can be understood that the thermal insulation pad 20 can be partially disposed in the first groove 111, or can be 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, and 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, and the space occupied by the thermal insulation pad 20 between two adjacent battery cells 10 can also 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] Furthermore, the first direction may be the length direction of the battery cell 10 (eg Figure 5 The thickness direction of the battery cell 10 (eg, Figure 5 The direction from top to bottom as shown in FIG. 1 ) may also be the width direction of the battery cell 10 (e.g. Figure 5 left to right direction as shown).

[0110] Among them, 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 cover of the battery cell 10 and the side opposite to the end cover; 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 faces 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 multiple battery cells 10.

[0111] 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 has 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 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.

[0112] According to the battery module 100 of the embodiment of the utility model, 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 constant, more battery cells 10 can be arranged, thereby improving the energy density of the battery 1000.

[0113] According to some embodiments of the present invention, Figure 6-Figure 7 As shown, 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 surfaces of the first shell walls 11 .

[0114] Specifically, the outer surface of the first shell wall 11 refers to the surface facing two adjacent battery cells 10, that is, the surface 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.

[0115] In this embodiment, by setting the first groove 111 formed 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 insulation pad 20, thereby improving the assembly rate of the battery module 100.

[0116] According to some embodiments of the present invention, Figure 6-Figure 7 As shown, first grooves 111 are formed on 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 a heat-insulating space, and the heat-insulating pad 20 is arranged in the heat-insulating space.

[0117] The shape and size of the thermal insulation space are matched with the shape and size of the thermal insulation pad 20 .

[0118] 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 track, thereby ensuring the thermal insulation effect of the thermal insulation pad 20.

[0119] According to some embodiments of the present invention, a heat-insulating pad 20 is provided in the heat-insulating space; or, a plurality of heat-insulating pads 20 are provided in the heat-insulating space.

[0120] In some specific embodiments, one insulation pad 20 is provided in the insulation pad 20 space, and in other specific embodiments, multiple insulation pads 20 are provided in the insulation space, for example, the number of insulation pads 20 can be two, three or more. The multiple insulation pads 20 can be arranged in sequence along the first direction, and the materials and sizes of the multiple insulation pads 20 can be different, which can be selected according to actual conditions.

[0121] 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.

[0122] 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 is beneficial to improving 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.

[0123] According to some embodiments of the present invention, Figure 13-Figure 15 As shown, the 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 .

[0124] 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.

[0125] In this embodiment, by setting the surfaces of the two first shell walls 11 opposite to each other in the first direction as inner surfaces, a 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 thermal runaway occurs in the battery cell 10, the high-temperature and high-pressure substances 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 substances diffusing to other battery cells 10 and causing damage to other battery cells 10.

[0126] According to some embodiments of the present invention, 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 .

[0127] For example, the number of the first grooves 111 may be one, two, three or more.

[0128] 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 , so that the first shell wall 11 has different heating zones.

[0129] 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.

[0130] In this embodiment, by setting the number of the first grooves 111 on the first shell wall 11 to be one or more, the size 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.

[0131] According to some embodiments of the present invention, the first groove 111 is a circular groove, an elliptical groove or a polygonal groove.

[0132] 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.

[0133] 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 the 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.

[0134] According to some embodiments of the present invention, 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.

[0135] 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.

[0136] 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, so that the first groove 111 can 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 two adjacent walls, and improve the reliability of the battery cell 10.

[0137] 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 point 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.

[0138] According to some embodiments of the present invention, Figure 20-21 As shown, in the length direction or width direction of the first shell wall 11 , the ratio between the distance between the periphery of the first groove 111 and the periphery of the first shell wall 11 and the size of the first shell wall 11 is 1 / 600 to 1 / 3.

[0139] 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.

[0140] For example, in the length direction of the first shell wall 11, the spacing 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 spacing 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. 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.

[0141] In this embodiment, by setting in the length direction or width direction of the first shell wall 11, the ratio between the distance between the circumference of the first groove 111 and the circumference of the first shell wall 11 and the size of the first shell wall 11 is 1 / 600 to 1 / 3, so that the distance between the circumferential wall of the first groove 111 and the circumferential edge of the first shell wall 11 will not be too small, and the first groove 111 can avoid the weak point of the first shell wall 11, 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 10; it can also prevent the distance between the circumferential wall of the first groove 111 and the circumferential edge of the first shell wall 11 from being 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 two adjacent battery cells 10, reduce the area of ​​direct contact between two adjacent battery cells 10, and further reduce heat diffusion and reduce the risk of damage to adjacent battery cells 10.

[0142] According to some embodiments of the present invention, 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;

[0143] 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.

[0144] In this embodiment, by setting the spacing between the peripheral wall of the first groove 111 and the peripheral edge of the first shell wall 11 to 0.5mm~2mm, the spacing between the peripheral wall of the first groove 111 and the peripheral edge of the first shell wall 11 can be not 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 two adjacent walls, thereby improving the reliability of the battery cell 10; the spacing between the peripheral wall of the first groove 111 and the peripheral edge of the first shell wall 11 can be 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 two adjacent battery cells 10, reducing the area of ​​direct contact between two adjacent battery cells 10, and further reducing heat diffusion and reducing the risk of damage to adjacent battery cells 10.

[0145] According to some embodiments of the present invention, Figure 20-21 As shown, in the length direction or width direction of the first shell wall 11 , the ratio between the distance between the periphery of the first groove 111 and the periphery of the first shell wall 11 and the size of the first shell wall 11 is 1 / 150 to 1 / 30.

[0146] 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 periphery of the first groove 111 and the periphery 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 periphery of the first groove 111 and the periphery of the first shell wall 11 to the size b2 of the first shell wall 11 is 1 / 150 to 1 / 30.

[0147] 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.

[0148] In this embodiment, by setting the first shell wall 11 in the length direction or width direction, the ratio between the distance between the circumference of the first groove 111 and the circumference of the first shell wall 11 and 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.

[0149] According to some embodiments of the present invention, Fig.21 As shown, a first concave 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.

[0150] That is, the first shell wall 11 may have a first groove 111 formed on the inner surface and a plane formed on the outer surface, or may have a first groove 111 formed on the outer surface and a plane formed on the inner surface. The thermal insulation pad 20 fits in the first groove 111, so that in some specific embodiments, the thermal insulation pad 20 can be disposed in the accommodating cavity of the battery cell 10, and in other specific embodiments, the thermal insulation pad 20 is disposed on the outer side of the battery cell 10.

[0151] It can be understood that the first groove 111 in the present embodiment is formed by digging, for example, it can be formed 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.

[0152] In this embodiment, a 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 a plane, so that the influence of the first groove 111 on the energy density of the battery cell 10 can be reduced.

[0153] According to some embodiments of the present invention, Fig.21 As shown, 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.

[0154] For example, the depth of the first groove 111 is d, the thickness of the first shell wall 11 is h, and the value of d / h can be 1 / 6, 2 / 6, 3 / 6, 4 / 6 or 5 / 6.

[0155] 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 installable space of the thermal insulation pad 20.

[0156] According to some embodiments of the present invention, Fig.21 As shown, 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.

[0157] 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.

[0158] 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 satisfying 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.

[0159] According to some embodiments of the present invention, Fig.21 As shown, the depth of the first groove 111 is 0.1 mm to 2 mm.

[0160] 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.

[0161] 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 and does not affect the structural strength required by the first shell wall 11, so that the first shell wall 11 can still protect the battery cell 10.

[0162] According to some embodiments of the present invention, the first groove 111 is formed by stamping on the first shell wall 11 .

[0163] Among them, stamping forming is a forming processing 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.

[0164] In this embodiment, the first groove 111 is formed by stamping on the first shell wall 11, wherein the stamping process is simple to manufacture, thereby reducing the difficulty of producing the first groove 111 and increasing the production rate of the battery cell 10; at the same time, the stamping process is performed according to a mold, has high dimensional accuracy and good interchangeability, and does not require further machining to meet general assembly and use requirements; 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.

[0165] According to some embodiments of the present invention, the first groove 111 is formed by stamping from the outer surface of the first shell wall 11 toward the inner surface, and the depth of the first groove 111 is 2 mm to 10 mm.

[0166] 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.

[0167] 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.

[0168] In this embodiment, the first groove 111 is stamped 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.

[0169] According to some embodiments of the utility model, some of the multiple battery cells 10 are arranged along a second direction, the second direction is perpendicular to the first direction, and in two adjacent battery cells 10 in the second direction, the side walls of the two battery cells 10 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 a thermal insulation pad 20 is provided in the second groove.

[0170] Specifically, the plurality of battery cells 10 are partially arranged along the first direction and partially arranged along the second direction. Among them, at least one of the two first shell walls 11 in the first direction is formed with a first groove 111, and at least one of the two second shell walls in the second direction is formed with a second groove, that is, a plurality of battery cells 10 are arranged with a thermal insulation pad 20 between two adjacent battery cells 10 in the first direction and the second direction, so that when a battery cell 10 has thermal runaway, the thermal insulation pad 20 can block heat diffusion in multiple directions, thereby further reducing the risk of heat diffusion to other battery cells 10, and improving the reliability of the battery 1000.

[0171] Here, “at least one of the two second shell walls is formed with a second groove” can be understood as that the second groove can be formed on only one of the two second shell walls, or on both second shell walls.

[0172] In this embodiment, a second groove is formed in 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, thereby improving the reliability of the battery 1000.

[0173] According to some embodiments of the utility model, some of the multiple battery cells 10 are arranged along a third direction, and the third direction 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 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 a thermal insulation pad 20 is provided in the third groove.

[0174] Specifically, multiple battery cells 10 can be partially arranged along the first direction and partially arranged along the third direction; or multiple battery cells 10 can be partially arranged along the first direction, partially arranged along the second direction, and partially arranged 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, 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.

[0175] In this embodiment, “at least one of the two third shell walls is formed with a third groove” can be understood as follows: the third groove can be formed on one of the two third shell walls, or the groove can be formed on both of the two third shell walls.

[0176] In this embodiment, a third groove is formed by setting at least one of the two third shell walls, and an insulation pad 20 is provided in the third groove, so that the 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, thereby improving the reliability of the battery 1000.

[0177] According to some embodiments of the present invention, Figure 20-21 As shown, the battery cell 10 is provided with an explosion-proof valve 13 at least at 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.

[0178] 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.

[0179] Specifically, when thermal runaway occurs in the battery cell 10, high-temperature and high-pressure materials 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.

[0180] 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.

[0181] 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 to 30, the size of the thermal insulation pad 20 is not too small, so that 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, thereby allowing the thermal insulation pad 20 to cover 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 reducing the risk of heat diffusion to other battery cells 10; at the same time, it also prevents the size of the thermal insulation pad 20 from being 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.

[0182] According to some embodiments of the present invention, Fig.21 As shown, 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.

[0183] 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.

[0184] 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 1.5-10, 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.

[0185] According to some embodiments of the present invention, an explosion-proof valve 13 is provided at least at one end of the battery cell 10 in the third direction, and in the direction of the third direction gradually away from the explosion-proof valve 13, 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.

[0186] It is understandable that the battery cell 10 may be provided with an explosion-proof valve 13 at only one end in the third direction, or may be provided with explosion-proof valves 13 at both ends in the third direction.

[0187] In some specific embodiments, as the third direction gradually moves away from the explosion-proof valve 13, the width of the first groove 111 in the second direction remains unchanged; in other specific embodiments, as the third direction gradually moves away from the explosion-proof valve 13, the width of the first groove 111 in the second direction gradually decreases.

[0188] Specifically, when thermal runaway occurs in the battery cell 10, the high-temperature gas will move along the exhaust space in 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 third direction gradually away from the explosion-proof valve 13, 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 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.

[0189] In this embodiment, by keeping the width of the first groove 111 in the second direction unchanged as it moves away from the explosion-proof valve 13 in the third direction, 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; by gradually reducing the width of the first groove 111 in the second direction as it moves away from the explosion-proof valve 13 in the third direction, the thermal insulation pad 20 can reduce the use area of ​​the thermal insulation pad 20 while 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.

[0190] According to some embodiments of the present invention, Fig.21 As shown, the thickness of the thermal insulation pad 20 is 0.5 mm to 3 mm.

[0191] 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.

[0192] In this embodiment, the thickness of the thermal insulation pad 20 is set to 0.5mm to 3mm, so that the thickness of the thermal insulation pad 20 is not too small, which is conducive to the thermal insulation pad 20 meeting the thermal insulation requirements between the battery cells 10. In this way, when the battery cell 10 has thermal runaway, the heat transferred to the adjacent battery cell 10 can be effectively reduced, and the heat diffusion can be reduced, thereby reducing the risk of damage to the adjacent battery cell 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, so that the battery module 100 can stack more battery cells 10 in the same size, thereby improving the energy density of the battery 1000.

[0193] According to some embodiments of the present invention, Fig.21 As shown, the thickness of the thermal insulation pad 20 is 0.8 mm to 2.5 mm.

[0194] 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.

[0195] In this embodiment, by setting the thickness of the thermal insulation pad 20 to 0.8 mm to 2.5 mm, 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.

[0196] In some specific embodiments, the battery module 100 further includes a longitudinal beam 30 , and the longitudinal beam 30 is used to fix a plurality of battery cells 10 so that the battery cells 10 are assembled into the battery module 100 .

[0197] The battery 1000 according to the second aspect of the present invention includes the battery module 100 according to the first aspect of the present invention.

[0198] In some specific embodiments of the present invention, for example Figure 3 As shown, 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, and a plurality of battery cells 10 are disposed in the cavity. The cover plate 202 is sealed on the top of the main box 201 by fasteners.

[0199] Optionally, a plurality of battery cells 10 may be stacked and arranged in the cavity along a thickness direction of the battery cells 10 .

[0200] 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 penetrate the cover plate 202 in the up and down directions, the plurality of first fixing holes correspond to the plurality of second fixing holes one by one and are opposite to each other up and down, the battery 1000 also includes a plurality of fasteners, 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.

[0201] Optionally, the cover plate 202 may be a carbon steel plate, an aluminum plate or a composite material plate.

[0202] This embodiment can facilitate the loading of the battery cell 10 into the box body 200 by configuring the box body 200 as 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.

[0203] In some specific embodiments of the present invention, 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.

[0204] The battery 1000 may include only the first glue layer, or only the second glue layer, or may include both the first glue layer and the second glue layer. The first glue layer is used to bond and connect the bottom wall of the main box 201 and the battery cell 10, and the second glue layer is used to bond and connect the cover plate 202 and the battery cell 10, so as to reliably fix multiple battery cells 10 in the box 200, improve the reliability and stability of the connection between the battery cell 10 and the box 200, and prevent the battery cell 10 from shaking in the box 200.

[0205] 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.

[0206] According to the battery 1000 of the present invention, the battery module 100 of the first aspect is provided, thereby improving the overall performance of the battery 1000 .

[0207] The electrical device according to the third aspect of the utility model comprises the battery 1000 according to the second aspect of the utility model, and the battery 1000 is used to provide electrical energy.

[0208] According to the electric device of the present invention, the battery 1000 of the second aspect is provided, thereby improving the overall performance of the electric device.

[0209] The following will refer to Figure 5-Figure 21 The battery module 100 according to five specific embodiments of the present invention is described.

[0210] Embodiment 1,

[0211] Reference Figure 5The battery module 100 includes a plurality of battery cells 10, a heat insulating pad 20 and a longitudinal beam 30. The battery cells 10 are arranged flat, the thickness direction of the battery cells 10 is the up-down direction, the battery cells 10 are stacked in two layers in the up-down direction, and the heat insulating pad 20 is arranged between two battery cells 10 arranged up and down, and is used to isolate the two battery cells 10 to reduce heat transfer between two adjacent battery cells 10.

[0212] Specifically, the side walls of the two battery cells 10 arranged opposite to each other are formed as the first shell wall 11, and the first shell wall 11 includes an outer surface and an inner surface, wherein the surface of the two first shell walls 11 facing each other is the outer surface, and the surface of the two first shell walls 11 facing each other is the inner surface. The two first shell walls 11 are formed with a first groove 111, and 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 a plane. The size and setting position of the two first grooves 111 are exactly the same. In the up and down direction, the two first grooves 111 are connected and define a heat insulation space, and the heat insulation pad 20 is arranged in the heat insulation space.

[0213] 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.

[0214] Furthermore, 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 the length direction of the battery cells 10 is the front and back direction.

[0215] The battery cell 10 further includes a pole 12 and an explosion-proof valve 13, wherein the pole 12 is disposed on one side of the battery cell 10 in the width direction, and the explosion-proof valve 13 is disposed on the other side of the battery cell 10 in the width direction. The longitudinal beam 30 is disposed on the side of the battery cell 10 where the explosion-proof valve 13 is disposed, and is used to fix a plurality of battery cells 10, wherein the width direction of the battery cell 10 is the left-right direction.

[0216] 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 materials, the thermal insulation pad 20 can cover at least a part of the melted portion of the first shell wall 11 to reduce the high-temperature and high-pressure materials discharged through the melted portion 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.

[0217] According to the battery module 100 of the embodiment of the utility model, 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 constant, more battery cells 10 can be arranged, thereby improving the energy density of the battery 1000.

[0218] Embodiment 2:

[0219] Reference Fig.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.

[0220] 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 as 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, thereby reducing the impact of high-temperature and high-pressure materials on the first shell wall 11, and thus reducing the risk of the first shell wall 11 being melted.

[0221] Embodiment 3,

[0222] Reference Fig.16 The structure of this embodiment is substantially the same as that of the first embodiment, wherein the same components are marked with the same reference numerals, and the only difference is that the first shell wall 11 described in the first embodiment is two side walls oppositely disposed between two battery cells 10 adjacent to each other vertically, while the first shell wall 11 described in the third embodiment is two side walls oppositely disposed between two battery cells 10 adjacent to each other frontally.

[0223] 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 in the front-to-back direction of the battery cells 10. The thermal insulation pad 20 is used to isolate two adjacent battery cells 10 in the front and back direction to reduce heat transfer between two adjacent battery cells 10 in the front-to-back direction.

[0224] Embodiment 4:

[0225] Reference Fig.18 and Fig.19The structure of this embodiment is substantially the same as that of the first embodiment, wherein the same components are marked with the same reference numerals, and the only difference is that the first shell wall 11 described in the first embodiment is two side walls oppositely disposed between two battery cells 10 adjacent to each other vertically, while the first shell wall 11 described in the fourth embodiment is two side walls oppositely disposed between two battery cells 10 adjacent to each other horizontally.

[0226] 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, and 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, thereby, 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.

[0227] Embodiment 5,

[0228] The structure of this embodiment is substantially the same as that of the first embodiment, wherein the same components are marked with the same reference numerals, and the only difference is that the battery cell 10 described in the first embodiment is only formed with a first groove 111, while the battery cell 10 described in the fifth embodiment is also formed with a second groove.

[0229] 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 opposite to each other, and two second grooves are formed on two second shell walls of two adjacent battery cells 10 arranged horizontally opposite to each other, 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.

[0230] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it; although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and description of the utility model. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The utility model 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, characterized in that: include: A plurality of battery cells, wherein at least part of the plurality of battery cells are 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 (11), and at least one of the two first shell walls (11) is formed with a first groove (111); A thermal insulation pad (20), wherein the thermal insulation pad (20) is at least partially disposed in the first groove (111).

2. The battery module according to claim 1, characterized in that: 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).

3. The battery module according to claim 2, characterized in that: The first grooves (111) are formed on both of the 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 a heat-insulating space, and the heat-insulating pad (20) is arranged in the heat-insulating space.

4. The battery module according to claim 3, characterized in that: The thermal insulation space contains one thermal insulation pad (20); or, the thermal insulation space contains a plurality of thermal insulation pads (20).

5. The battery module according to claim 1, characterized in that: The 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).

6. The battery module according to claim 1, characterized in that: 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 claim 1, characterized in that: The first groove (111) is a circular groove, an elliptical groove or a polygonal groove.

8. The battery module according to claim 1, characterized in that: The spacing between the circumference of the first groove (111) and the circumference 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 between the spacing between the circumference of the first groove (111) and the circumference of the first shell wall (11) and the size of the first shell wall (11) is 0.5 / 300 to 100 / 300.

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

10. The battery module according to claim 1, characterized in that: 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.

11. The battery module according to claim 10, characterized in that: 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.

12. The battery module according to claim 11, characterized in that: 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.

13. The battery module according to claim 10, characterized in that: The depth of the first groove (111) is 0.1 mm to 2 mm.

14. The battery module according to claim 1, characterized in that: The first groove (111) is formed by stamping on the first shell wall (11).

15. The battery module according to claim 14, characterized in that: The first groove (111) is formed by punching from the outer surface of the first shell wall (11) toward the inner surface, and the depth of the first groove (111) is 2 mm to 10 mm.

16. The battery module according to claim 1, characterized in that: Some of the plurality of battery cells are arranged along a second direction, the second direction is perpendicular to the first direction, and 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, at least one of the two second shell walls is formed with a second groove, and the thermal insulation pad (20) is arranged in the second groove.

17. The battery module according to claim 1 or 16, characterized in that: Part of the plurality of battery cells are arranged along a third direction, the third direction being perpendicular to the first direction, and in two adjacent battery cells in the third direction, side walls of the two battery cells arranged facing each other are both third shell walls, at least one of the two third shell walls is formed with a third groove, and the thermal insulation pad (20) is arranged in the third groove.

18. The battery module according to claim 1, characterized in that: An explosion-proof valve (13) is provided at least at one end of the battery cell in the third direction, the heat 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 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.

19. The battery module according to claim 18, characterized in that: 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.

20. The battery module according to claim 1, characterized in that: At least one end of the battery cell in the third direction is provided with an explosion-proof valve (13); in a 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; the first direction, the second direction and the third direction are perpendicular to each other.

21. The battery module according to claim 1, characterized in that: The thickness of the thermal insulation pad (20) is 0.5 mm to 3 mm.

22. The battery module according to claim 21, characterized in that: The thickness of the thermal insulation pad (20) is 0.8 mm to 2.5 mm.

23. A battery, characterized in that: Comprising a battery module according to any one of claims 1-22.

24. An electrical device, characterized in that: A battery according to claim 23, for providing electrical energy.

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