Battery devices and electrical equipment

Abstract

This application discloses a battery device and an electrical appliance. The battery device includes a battery box, battery cells, a heat exchanger, and an insulation structure. The battery box has a support surface; the battery cells are disposed within the battery box, each having a first end face and multiple side faces; the first end face is connected to the support surface, and the multiple side faces are arranged circumferentially around the first end face; at least one side face is formed as a heat exchange surface, and the heat exchanger is heat-exchange connected to the heat exchange surface; the insulation structure includes an insulating coating and an insulating film, the insulating coating being disposed on the first end face, and the insulating film being disposed on the side faces; a portion of the insulating coating extends at least to the heat exchange surface and is laminated with the insulating film to form a first overlap area. The technical solution of this application can improve the reliability of the battery device.

Description

Technical Field

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

[0002] To improve weight reduction, battery devices in related technologies typically use aluminum for the casing of individual battery cells. However, this casing makes the battery cells prone to becoming charged, posing a risk of short circuits with external structures and affecting the reliability of the battery device. Utility Model Content

[0003] The main objective of this application is to provide a battery device and an electrical appliance designed to improve the reliability of the battery device.

[0004] To achieve the above objectives, the battery device proposed in this application includes:

[0005] The battery box has a support surface inside.

[0006] A battery cell is located inside a battery box. The battery cell has a first end face and multiple side faces. The first end face is connected to a support surface, and the multiple side faces are arranged around the first end face in a circumferential manner.

[0007] A heat exchanger element, wherein at least one side is formed as a heat exchange surface, and the heat exchanger element and the heat exchange surface are configured for heat exchange connection; and

[0008] An insulating structure includes an insulating coating and an insulating film. The insulating coating is disposed on a first end face, and the insulating film is disposed on a side face. A portion of the insulating coating extends at least to the heat exchange surface and is laminated with the insulating film to form a first overlapping area.

[0009] The battery device of this application has an insulating coating on the first end face of the battery cell. This insulating coating provides insulation protection to the side where the first end face is located, reducing the risk of short circuit between the battery cell and the battery box. Furthermore, since the insulating coating has strong adhesion to both the battery cell and the supporting surface of the battery box, it improves the stability of the connection between the battery cell and the battery box via the first end face. This achieves the dual function of the insulating coating on the side where the first end face is located, providing both insulation protection and enhancing the stability of the installation.

[0010] Meanwhile, the battery device also features an insulating film on the side of each battery cell. This film provides insulation and protection to the periphery of the battery cell, reducing the risk of short circuits between the battery cell and surrounding heat exchange components or other battery cells. Furthermore, the low cost of the insulating film allows for a balance between insulation protection and reduced manufacturing costs of the battery device.

[0011] Furthermore, the insulating coating extends at least to the heat exchange surface on the side where it is in heat exchange connection with the heat exchanger, and is stacked with the insulating film to form a first overlapping area. This first overlapping area can increase the creepage distance between the battery cell and the heat exchanger, thereby further improving the insulation protection effect of the insulating structure between the battery cell and the heat exchanger.

[0012] In other words, the battery device of this application, by providing an insulating coating and an insulating film on the first end face and the side peripheral face respectively, and the insulating coating extending to the heat exchange surface to form a first overlapping area with the insulating film, can better meet the stability of the battery cell installation and fixation in the battery box, as well as the stability of the insulation protection between the battery cell and the external structure, achieving reliable stability in both installation and insulation, thereby improving the reliability of the battery device while taking into account the manufacturing cost of the battery device.

[0013] In some embodiments, the normal direction of the first end face is defined as the first direction, the first overlapping area does not overlap with the projection of the heat exchanger on the heat exchange surface, and is arranged along the first direction.

[0014] This prevents the first overlapping area and the heat exchanger from stacking in the normal direction of the heat exchange surface, thus avoiding thickness accumulation. This helps to improve the compactness of the arrangement between the heat exchanger and the battery cell, thereby increasing the energy density of the battery device.

[0015] In some embodiments, along the first direction, the proportion of the first overlapping area on the heat exchange surface is greater than or equal to 2% and less than or equal to 6%.

[0016] Therefore, the length of the first overlapping area is not too small, which helps to increase the creepage distance between the battery cell and the heat exchanger; and the length of the first overlapping area is not too large, which prevents it from occupying too much space on the heat exchange surface, so that the heat exchanger can be arranged above or below the first overlapping area.

[0017] In some embodiments, along the first direction, the length of the insulating film is greater than the length of the insulating coating on the heat exchange surface, and the heat exchange element is located on the side of the first overlapping region away from the first end face.

[0018] Therefore, the insulating coating in the first overlapping area is shorter in the first direction, reducing the amount of insulating coating used. Since the cost of the insulating coating is higher than that of the insulating film, the manufacturing cost of the battery device can be reduced. Simultaneously, it allows the first overlapping area to extend upwards from the first end face, so that it can be close to the lower side of the battery cell, thus fully utilizing the space on the heat exchange surface below the heat exchange element. In this way, while ensuring a large heat exchange area and high heat exchange efficiency in most of the area corresponding to the heat exchange surface, the first overlapping area can still be easily offset to avoid the heat exchange element located above.

[0019] In some embodiments, the coverage area of ​​the heat exchanger on the heat exchange surface is an area extending from the center of the heat exchange surface to both sides along a first direction;

[0020] Along the first direction, the proportion of heat exchange components on the heat exchange surface is greater than or equal to 85% and less than or equal to 92%.

[0021] This allows the heat exchanger to cover most of the central area of ​​the heat exchange surface, resulting in a larger heat exchange area, which in turn improves the heat exchange efficiency of the heat exchanger for the individual battery cells. Simultaneously, it also allows space below the heat exchanger to facilitate the arrangement of the first overlap area.

[0022] In some embodiments, along the first direction, the length of the insulating film is less than the length of the insulating coating on the heat exchange surface, and the heat exchanger is located on the side of the first overlapping region near the first end face.

[0023] Therefore, the insulating coating in the first overlapping area has a longer length in the first direction, and the insulating coating has better insulation performance than the insulating film and is not easily damaged, which helps to improve the insulation protection effect on the battery cells.

[0024] In some embodiments, the battery cell further has a second end face, which is disposed at a relative distance from the first end face;

[0025] In the first end face and the second end face, the heat exchanger is positioned closer to the first end face;

[0026] Along the first direction, the proportion of heat exchange components on the heat exchange surface is greater than or equal to 70% and less than or equal to 85%.

[0027] This allows for the arrangement of parts of the insulating film that do not overlap with the insulating coating, as well as the first overlapping area, while also taking into account the heat exchange area between the heat exchanger and the battery cell.

[0028] In some embodiments, the first overlapping region at least partially overlaps with the projection of the heat exchanger onto the heat exchange surface.

[0029] This increases the length of the first overlap area in the first direction, which in turn increases the creepage distance between the battery cell and the heat exchanger, thereby improving the insulation protection of the insulation structure between the battery cell and the heat exchanger.

[0030] In some embodiments, the normal direction of the first end face is defined as the first direction, and along the first direction, the coverage of the first overlapping area on the heat exchanger is greater than or equal to 80%.

[0031] Therefore, setting the coverage of the heat exchanger in the first overlapping area to be greater than or equal to 80% can result in a larger contact area between the two, so that the heat exchanger can be flatly attached to the outside of the battery cell, which is beneficial to improving the uniformity of the force on the battery cell, so that the battery cell can operate normally and stably.

[0032] In some embodiments, the first overlap region covers a portion of the heat exchanger, and in the first overlap region, the insulating film is located outside the insulating coating. The battery device also includes a filler layer.

[0033] The first overlapping area is located on the side of the heat exchanger close to the first end face. The filling layer is disposed between the insulating film and the heat exchanger, and is disposed corresponding to the part of the heat exchanger that is misaligned with the first overlapping area.

[0034] Alternatively, the first overlapping area is located on the side of the heat exchanger away from the first end face, and the filling layer is disposed between the insulating coating and the heat exchanger, and is disposed corresponding to the part of the heat exchanger that is misaligned with the first overlapping area.

[0035] Therefore, the filling layer provides support, which facilitates the flat bonding of the heat exchange components to the outside of the battery cell, thereby improving the uniformity of the force on the battery cell and enabling the battery cell to operate normally and stably.

[0036] In some embodiments, the normal direction of the first end face is defined as the first direction, and along the first direction, the coverage of the first overlap area on the heat exchanger is less than 80%.

[0037] This allows for a shorter length of the first overlapping region in the first direction, which in turn helps reduce the amount of insulating film and insulating coating used, thereby lowering the manufacturing cost of the battery device.

[0038] In some embodiments, the filler layer is made of a thermally conductive material.

[0039] Therefore, the filling layer is made of a thermally conductive material so that it does not hinder the heat exchange between the battery cell and the heat exchanger, so that the heat exchanger can perform normal and stable heat exchange with the battery cell.

[0040] In some embodiments, a portion of the insulating film extends to the first end face and is laminated with the insulating coating to form a second overlapping area;

[0041] The second overlapping area is ring-shaped and is arranged around the circumference of the first end face.

[0042] This further increases the creepage distance between the battery cell and external structures such as heat exchangers, thereby improving the insulation protection provided by the insulation structure between the battery cell and the heat exchanger. Furthermore, the second overlapping area is a ring shape circumferentially surrounding the first end face, ensuring insulation protection on all circumferential sides of the battery cell.

[0043] In some embodiments, the coverage of the second overlapping area over the first end face is greater than or equal to 10% and less than or equal to 25%.

[0044] This design ensures that the width of the second overlapping area is not too small, thus improving the insulation protection effect. At the same time, it also ensures that the width of the second overlapping area is not too large, so that the insulating coating still has a large proportion. Compared with the insulating film, the insulating coating has a stronger bonding force with both the battery cell and the battery box, which helps to improve the stability of the battery cell when it is connected to the battery box through the insulating coating.

[0045] In some embodiments, portions of the insulating coating extend to all sides and are stacked with the insulating film to form a first overlapping area in the shape of a ring.

[0046] This allows the first overlapping area to provide insulation protection on all sides of the battery cell, thereby further improving the insulation protection effect of the insulation structure on the battery cell.

[0047] On the other hand, the electrical equipment proposed in this application includes the battery device in any of the above embodiments. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0049] Figure 1 This is a schematic diagram of the structure of one embodiment of the vehicle of this application;

[0050] Figure 2 This is an exploded structural diagram of an embodiment of the battery device of this application;

[0051] Figure 3 This is an exploded structural diagram of a single battery cell according to an embodiment of this application;

[0052] Figure 4This is a schematic diagram of the battery device according to an embodiment of the present application with the lid removed;

[0053] Figure 5 This is a partial structural schematic diagram of an embodiment of the battery device of this application;

[0054] Figure 6 for Figure 5 A magnified view of a section at point A in the middle;

[0055] Figure 7 This is a partial structural schematic diagram of another embodiment of the battery device of this application;

[0056] Figure 8 for Figure 7 A magnified view of a section at point B in the middle;

[0057] Figure 9 This is a partial structural schematic diagram of another embodiment of the battery device of this application;

[0058] Figure 10 for Figure 9 A magnified view of a section at point C;

[0059] Figure 11 This is a partial structural schematic diagram of another embodiment of the battery device of this application;

[0060] Figure 12 for Figure 11 A magnified view of a section at point D.

[0061] Explanation of icon numbers:

[0062] 100. Battery assembly; 1. Battery box; 1a. Receptacle; 11. Box cover; 12. Box body; 121. Support surface; 20. Battery cell; 21. End cap; 21a. Terminal post; 22. Housing; 221. First end face; 223. Side; 224. Heat exchange surface; 225. Second end face; 23. Electrode assembly; 231. Tab; 30. Heat exchange component; 40. Insulation structure; 41. Insulation coating; 43. Insulation film; 40a. First overlapping area; 40b. Second overlapping area; 50. Filler layer; 1000. Vehicle; 200. Controller; 300. Motor.

[0063] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0064] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0065] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0066] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0067] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0068] A battery device, or energy storage device, is widely used not only in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in other fields. A battery device may include a battery box and individual battery cells housed within the battery box. The battery box may include a box body and a cover that fits over the box body to enclose a cavity containing the individual battery cells. The individual battery cell is the smallest unit comprising a battery, typically including a casing and an electrode assembly housed within the casing. The electrode assembly is the component in the individual battery cell where the electrochemical reaction actually occurs, and may include a positive electrode, a negative electrode, and a separator located between them, formed by winding or stacking the positive electrode, negative electrode, and separator. Furthermore, at least two individual battery cells within the battery box may be connected in series, in parallel, or in a hybrid connection including both series and parallel connections.

[0069] Furthermore, to improve the lightweight effect of battery devices, the casing of individual battery cells is usually made of aluminum or steel. However, this makes the casing of the battery cells prone to becoming charged, potentially leading to a short circuit with external structures. To address this, related technologies cover the bottom and sides of the battery cells with insulating films. While these films provide insulation and protection for the bottom and sides of the battery cells, the limited bonding strength between the insulating film and the casing and battery box results in low stability of the battery cells within the battery box, still affecting the reliability of the battery device.

[0070] Therefore, based on the above considerations, and in order to solve the problem of low reliability of battery devices in related technologies, this application proposes a novel battery device. This battery device innovatively provides an insulating coating and an insulating film on the first end face and side face of the battery cell, respectively. The insulating coating provides insulation on the side of the battery cell where the first end face is located, and also improves the stability of the connection with the battery box. The insulating film provides insulation around the battery cell. Furthermore, a portion of the insulating coating extends at least to the heat exchange surface in the side face to form a first overlap area with the insulating film, thereby increasing the creepage distance between the battery cell and the heat exchange component, further improving the insulation protection between the battery cell and the heat exchange component. In this way, both the stability of the battery cell during installation and the stability of the insulation between the battery cell and the external structure can be improved, thus contributing to the improvement of the reliability of the battery device.

[0071] Furthermore, it should be noted that the battery device proposed in this application can be applied to electrical devices. These electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Further, electric toys can include stationary 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.

[0072] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0073] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0074] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0075] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a battery case 1 and a battery cell 20; the battery case 1 has a receiving cavity 1a, and the battery cell 20 is disposed inside the battery case 1.

[0076] The battery case 1 can be used to form a receiving cavity 1a to provide a space for accommodating the battery cell 20. The battery case 1 can adopt various structures. In some embodiments, the battery case 1 can include a cover 11 and a body 12 that overlap each other to jointly define the receiving cavity 1a for accommodating the battery cell 20. In this case, the body 12 can provide accommodating support for the battery cell 20. In addition, both the cover 11 and the body 12 can be hollow structures with an opening on one side. In this case, the opening side of the cover 11 can cover the opening side of the body 12. Of course, the cover 11 can also be a plate structure and cover the opening side of the body 12. In addition, the battery case 1 formed by the cover 11 and the body 12 can be of various shapes, such as a cylinder, a cuboid, etc. Furthermore, the cover 11 and the body 12 can be arranged along a first direction.

[0077] A battery cell 20 refers to the smallest unit constituting the battery device 100. The number of battery cells 20 can be one, two, or more. When there are multiple battery cells 20, they can be connected in series, parallel, or a combination thereof. A combination thereof means that multiple battery cells 20 are connected in both series and parallel. When the battery device 100 is in its normal installation and use state, the first direction can be defined as the vertical direction, and the second and third directions can be two intersecting horizontal directions. In this case, the multiple battery cells 20 can be arranged in a row along the second direction, or further arranged in at least two rows along the third direction. Alternatively, the multiple battery cells 20 can also be arranged in a row along the third direction, or further arranged in at least two rows along the second direction. This application does not limit the arrangement direction of the multiple battery cells 20. Of course, the first direction can also be other directions, and this application does not limit the specific direction type of the first, second, and third directions.

[0078] In addition, the battery device 100 may include other structures, such as busbars, for electrical connection between multiple battery cells 20. Furthermore, each battery cell 20 may be a secondary or primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, cuboid, or other shapes.

[0079] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. The battery cell 20 includes an end cap 21, a housing 22, an electrode assembly 23, and other functional components.

[0080] End cap 21 refers to a component that covers the opening of housing 22 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 21 can be adapted to the shape of housing 22 to fit it. Optionally, end cap 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 21 is not easily deformed under pressure and impact, giving battery cell 20 higher structural strength and improved safety performance. Functional components such as terminals 21a can be provided on end cap 21. Terminals 21a can be used to electrically connect to electrode assembly 23 for outputting or inputting electrical energy into battery cell 20. In some embodiments, end cap 21 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 20 reaches a threshold. The material of end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 21. The insulating element can be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0081] The housing 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The housing 22 and the end cap 21 can be independent components. An opening can be provided on the housing 22, and the end cap 21 can be used to close the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and the housing 22 can be integrated. Specifically, the end cap 21 and the housing 22 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 22, the end cap 21 closes the housing 22. The housing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.

[0082] Electrode assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. The casing 22 may contain one or more electrode assemblies 23. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 23, while the portions of the positive and negative electrode sheets without active material each constitute a tab 231. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery device 100, the positive and negative active materials react with the electrolyte, and the tabs 231 connect to the terminals 21a to form a current circuit.

[0083] Please refer to the reference. Figures 3 to 6 In one embodiment of this application, the battery box 1 has a support surface 121; the battery cell 20 has a first end face 221 and a plurality of side faces 223; the first end face 221 is connected to the support surface 121, and the plurality of side faces 223 are arranged circumferentially around the first end face 221. The battery device 100 also includes a heat exchanger 30 and an insulation structure 40; at least one side face 223 is formed as a heat exchanger 224, and the heat exchanger 30 is heat-exchange connected to the heat exchanger 224; the insulation structure 40 includes an insulating coating 41 and an insulating film 43, the insulating coating 41 is disposed on the first end face 221, and the insulating film 43 is disposed on the side face 223; a portion of the insulating coating 41 extends at least to the heat exchanger 224 and is laminated with the insulating film 43 to form a first overlap area 40a.

[0084] The support surface 121 can be used to install and support the battery cells 20 disposed inside the battery box 1. The support surface 121 can be located on the inner side of the box body 12 directly opposite its opening, or on the inner side of the box cover 11. Furthermore, in the first direction being vertical, with the box cover 11 covering the upper end of the box body 12, the support surface 121 can be positioned upwards.

[0085] The first end face 221 of the battery cell 20 can be connected to the support surface 121, thereby enabling the battery cell 20 to be installed and fixed within the battery case 1. The first end face 221 can be located on the outer side of the housing 22 of the battery cell 20, directly opposite its opening. Alternatively, when the support surface 121 is facing upwards, the first end face 221 can be facing downwards to form the bottom surface of the battery cell 20, and the normal direction of the first end face 221 can be the first direction described above. Furthermore, the first end face 221 and the support surface 121 can be bonded together with adhesive to increase the connection area between them, thereby improving the stability of the battery cell 20 installation and fixing, while avoiding damage to the first end face 221 and the support surface 121.

[0086] The side surface 223 of the battery cell 20 can be located outside the opening of the casing 22 surrounding the battery cell 20. To improve the regularity of the shape of the battery cell 20 and facilitate the orderly and compact arrangement of multiple battery cells 20 within the battery case 1, the shape of the battery cell 20 can be cuboid. In this case, the number of side surfaces 223 can be four. Each of the four side surfaces 223 can include two opposing large faces and two opposing small faces, with the area of ​​the large faces being larger than the area of ​​the small faces. Furthermore, since the battery cell 20 generates heat during operation, to ensure that the battery cell 20 operates within a suitable temperature range, at least one of the multiple side surfaces 223 is configured as a heat exchange surface 224 for heat exchange and cooling with the heat exchanger 30. This application does not limit the number of heat exchange surfaces 224; one of the multiple side surfaces 223 can be formed as a heat exchange surface 224, both sides can be formed as heat exchange surfaces 224, or all of the side surfaces 223 can be formed as heat exchange surfaces 224. In some embodiments, to increase the heat exchange area between the battery cell 20 and the heat exchanger 30, a large surface can be formed as a heat exchange surface 224.

[0087] The heat exchanger 30 can be used to connect with the battery cell 20 for heat exchange, thereby cooling the battery cell 20. Of course, in some instances, where the ambient temperature is relatively low, the heat exchanger 30 can also be used to heat the battery cell 20. The heat exchange connection proposed in this application refers to a connection where the two components can exchange heat, including direct contact and indirect heat exchange through air or other objects.

[0088] Furthermore, the heat exchanger 30 may be provided with a heat exchange channel to facilitate heat exchange by introducing a heat exchange medium such as water or oil, thereby forming the heat exchanger 30 into a liquid-cooled plate structure or a liquid-cooled pipe structure. The heat exchange channel can be a cavity structure or a long strip structure. When the heat exchange channel is a long strip structure, it can extend linearly, or at least partially along an S-shape, or even along a U-shape, etc. This application does not limit the extension shape of the heat exchange channel.

[0089] Of course, in some embodiments, the heat exchanger 30 can also be a phase change energy storage structure that exchanges heat through the absorption and release of heat by the phase change material. This application does not limit the structural type of the heat exchanger 30.

[0090] Furthermore, the number of heat exchangers 30 can be at least two, and the at least two heat exchangers 30 can be arranged at intervals along the normal direction of the heat exchange surface 224, with at least one battery cell 20 disposed between two adjacent heat exchangers 30. To improve heat exchange efficiency, heat exchangers 30 can be disposed on both opposite sides of each battery cell 20, allowing adjacent heat exchangers 30 to exchange heat with the opposite sides of the battery cell 20. Further, to reduce the required number of heat exchangers 30 and simplify the number of components in the battery device 100, when multiple battery cells 20 are arranged along the direction of multiple heat exchangers 30 to form a battery pack, the battery device 100 can have at least two side-by-side battery packs. In this case, two adjacent heat exchangers 30 can be used to exchange heat with the opposite sides of corresponding battery cells 20 in each row of battery packs. Of course, in other embodiments, the number of heat exchangers 30 can also be one, forming a reciprocating S-shaped structure so that it can pass sequentially between any two adjacent battery cells 20.

[0091] The insulating coating 41 of the insulating structure 40 can be disposed on the first end face 221 to provide insulation protection between the battery cell 20 and the supporting surface 121 of the battery box 1. Simultaneously, due to the strong adhesion of the insulating coating 41, a stable connection can be formed between it and the battery cell 20, and subsequently after bonding to the supporting surface 121. The insulating coating 41 can be formed by applying an insulating coating such as epoxy resin, polyurethane, or acrylic to the first end face 221. Furthermore, the insulating coating 41 can cover the entire first end face 221 to improve the insulation protection effect. Of course, in some embodiments, the insulating coating 41 can also only cover a portion of the first end face 221, with the remaining portion covered by an insulating film 43 extending to the first end face 221.

[0092] The insulating film 43 of the insulating structure 40 can be disposed on each side 223. For example, when the four sides 223 include two large surfaces and two small surfaces, the insulating film 43 can be disposed on each large surface and each small surface to provide insulation protection for the battery cell 20 on all circumferential sides. Furthermore, the insulating film 43 can be disposed around each side 223 along the circumference of the battery cell 20 to provide good insulation coverage for the edges at the junctions of the sides 223. Of course, the number of insulating films 43 can also correspond to the number of sides 223, with each insulating film 43 affixed to one side 223. Additionally, the insulating film 43 can be made of polyethylene terephthalate, polyimide, polycarbonate, polyethylene, polyvinylidene fluoride, or polytetrafluoroethylene. Furthermore, the insulating film 43 can cover the entire side 223 to improve the insulation protection effect. Alternatively, the insulating film 43 can partially cover the side 223, with the remaining portion covered by an insulating coating 41 extending to the side 223. That is, the insulating film 43 can extend from the side of the side 223 away from the first end face 221 to the side of the first end face 221, or it can extend to the middle of the side 223 or other parts.

[0093] A portion of the insulating coating 41 extends at least to the heat exchange surface 224 and is laminated with the insulating film 43 to form a first overlap region 40a. This means that when only a portion of the multiple sides 223 are formed as heat exchange surfaces 224, the portion of the insulating coating 41 may extend only to the heat exchange surface 224, or it may extend further to other sides 223 not formed as heat exchange surfaces 224. In other words, the portion of the insulating coating 41 may extend only to some sides 223, or it may extend to all sides 223. Furthermore, in the first overlap region 40a, the insulating coating 41 may be located on the inner side, and the insulating film 43 may be located on the outer side. That is, the insulating coating 41 is located between the battery cell 20 and the insulating film 43.

[0094] Furthermore, along the first direction, the length of the insulating film 43 can be greater than the length of the insulating coating 41 located on the heat exchange surface 224, so that the first overlapping area 40a can be positioned close to the side of the battery cell 20 away from the first end face 221. When the first direction is vertical and the first end face 221 is facing downwards, it can also be said that the first overlapping area 40a is positioned close to the lower side of the battery cell 20. Of course, along the first direction, the length of the insulating film 43 can also be less than the length of the insulating coating 41 located on the heat exchange surface 224, so that the first overlapping area 40a can be positioned close to the side of the battery cell 20 with the first end face 221, or it can be said that the first overlapping area 40a is positioned close to the upper side of the battery cell 20. This application does not limit the location of the first overlapping area 40a on the battery cell 20.

[0095] Furthermore, the projections of the first overlapping region 40a and the heat exchanger 30 onto the heat exchange surface 224 may not overlap, or they may at least partially overlap. "Not overlapping" means that the projections of the first overlapping region 40a and the heat exchanger 30 onto the heat exchange surface 224 may be spaced apart, or their projection outlines may touch on opposite sides. "At least partially overlapping" means that the projection of the first overlapping region 40a onto the heat exchange surface 224 may be partially or completely within the projection of the heat exchanger 30.

[0096] The battery device 100 of this application has an insulating coating 41 on the first end face 221 of the battery cell 20. This insulating coating 41 provides insulation protection to the side of the first end face 221, reducing the risk of short circuits between the battery cell 20 and the battery box 1. Furthermore, since the insulating coating 41 has strong adhesion to both the battery cell 20 and the support surface 121 of the battery box 1, it improves the stability of the connection between the battery cell 20 and the battery box 1 via the first end face 221. This achieves the dual function of the insulating coating 41 in providing insulation protection and enhancing the stability of the installation on the side of the first end face 221. Simultaneously, the battery device 100 also has an insulating film 43 on the side 223 of the battery cell 20. This insulating film 43 provides insulation protection to the periphery of the battery cell 20, reducing the risk of short circuits between the battery cell 20 and surrounding heat exchange components 30 or other battery cells 20 structures. Furthermore, since the insulating film 43 has a low cost, it can simultaneously achieve insulation protection and reduce the manufacturing cost of the battery device 100. Further, a portion of the insulating coating 41 extends at least to the heat exchange surface 224 of the side surface 223, which is in heat exchange connection with the heat exchange element 30, and is stacked with the insulating film 43 to form a first overlap area 40a. This first overlap area 40a increases the creepage distance between the battery cell 20 and the heat exchange element 30, thereby further improving the insulation protection effect of the insulating structure 40 between the battery cell 20 and the heat exchange element 30. In other words, the battery device 100 of this application has an insulating coating 41 and an insulating film 43 respectively provided on the first end face 221 and the side peripheral surface, with the insulating coating 41 extending to the heat exchange surface 224 and forming a first overlap area 40a with the insulating film 43. It can better meet the stability requirements of battery cell 20 installation and fixation in battery box 1, as well as the stability of insulation protection between battery cell 20 and external structure, achieving reliable stability in both installation and insulation, improving the reliability of battery device 100, while taking into account the manufacturing cost of battery device 100.

[0097] Please refer to the reference. Figure 5 and Figure 6In one embodiment of this application, the first overlapping area 40a does not overlap with the projection of the heat exchanger 30 on the heat exchange surface 224, and is arranged along the first direction.

[0098] When the first end face 221 is facing downwards, the first overlapping area 40a can be staggered and set below the heat exchanger 30, or it can be staggered and set above the heat exchanger 30.

[0099] In this embodiment, the first overlapping area 40a and the heat exchanger 30 are staggered on the heat exchange surface 224 so that they do not stack in the normal direction on the heat exchange surface 224 and cause thickness superposition. This helps to improve the compactness of the arrangement between the heat exchanger 30 and the battery cell 20, so as to improve the energy density of the battery device 100.

[0100] In one embodiment of this application, along the first direction, the first overlapping region 40a accounts for more than or equal to 2% and less than or equal to 6% of the heat exchange surface 224.

[0101] Along the first direction, the proportion of the first overlapping region 40a on the heat exchange surface 224 can be the ratio of the length of the first overlapping region 40a in the first direction to the length of the heat exchange surface 224 in the first direction. The length of the heat exchange surface 224 in the first direction can also be described as the height between the first end face 221 of the battery cell 20 and the side facing away from the first end face 221.

[0102] In this embodiment, the ratio of the length of the first overlapping region 40a in the first direction to the length of the heat exchange surface 224 in the first direction is set to 2% to 6%. This ensures that the length of the first overlapping region 40a is not too small, thereby increasing the creepage distance between the battery cell 20 and the heat exchange component 30; it also ensures that the length of the first overlapping region 40a is not too large, thus not occupying too much space on the heat exchange surface 224, so that the heat exchange component 30 can be arranged above or below the first overlapping region 40a. The ratio of the length of the first overlapping region 40a in the first direction to the length of the heat exchange surface 224 in the first direction can be 2%, 3%, 4%, 5%, or 6%, or any value within the above range.

[0103] Please refer to the reference. Figure 5 and Figure 6 In one embodiment of this application, along the first direction, the length of the insulating film 43 is greater than the length of the insulating coating 41 located on the heat exchange surface 224, and the heat exchange element 30 is located on the side of the first overlap region 40a away from the first end face 221.

[0104] In this embodiment, along the first direction, the coverage length of the insulating film 43 on the heat exchange surface 224 is set to be greater than the coverage length of the insulating coating 41, so that the first overlapping area 40a can be located on the lower side of the battery cell 20. At this time, the length of the insulating coating 41 in the first overlapping area 40a is shorter in the first direction, which reduces the amount of insulating coating 41 used. Since the cost of the insulating coating 41 is higher than the cost of the insulating film 43, the manufacturing cost of the battery device 100 can be reduced. Simultaneously, the first overlapping area 40a can extend upwards from the first end face 221, so that the first overlapping area 40a can be close to the lower side of the battery cell 20, thereby fully utilizing the space on the heat exchange surface 224 below the heat exchange element 30. Thus, while the heat exchange element 30 can have a large heat exchange area and high heat exchange effect in most of the area corresponding to the middle of the heat exchange surface 224, the first overlapping area 40a can still be easily offset to avoid the heat exchange element 30 located above.

[0105] Of course, in some embodiments, the first overlapping area 40a may also be spaced apart from the first end face 221. In this case, it can also be said that the insulating film 43 is spaced apart from the first end face 221.

[0106] Please refer to Figure 5 In one embodiment of this application, the heat exchanger 30 covers a region on the heat exchange surface 224 that extends from the center of the heat exchange surface 224 to both sides along a first direction; along the first direction, the proportion of the heat exchanger 30 on the heat exchange surface 224 is greater than or equal to 85% and less than or equal to 92%.

[0107] The coverage area of ​​the heat exchanger 30 on the heat exchange surface 224 extends from the center of the heat exchange surface 224 to both sides along the first direction. This means that the centerline of the heat exchanger 30 can coincide with the centerline of the heat exchanger 30, or it can be within a preset range of intervals from the centerline of the heat exchanger 30. The proportion of the heat exchanger 30 on the heat exchange surface 224 along the first direction refers to the ratio of the length of the heat exchanger 30 in the first direction to the length of the heat exchange surface 224 in the first direction.

[0108] In this embodiment, the heat exchanger 30 covers the heat exchange surface 224 by extending from the center of the heat exchange surface 224 to both sides along the first direction, covering 85% to 92% of the heat exchange surface 224. This allows the heat exchanger 30 to cover most of the middle area of ​​the heat exchange surface 224, resulting in a larger heat exchange area, which improves the heat exchange effect of the heat exchanger 30 on the battery cell 20. Simultaneously, space is left below the heat exchanger 30 on the heat exchange surface 224, facilitating the arrangement of the first overlap area 40a. Furthermore, since the heat exchanger 30 is spaced apart from both the upper and lower sides of the battery cell 20, it effectively avoids the sampling components for temperature and voltage located on the upper side of the battery cell 20, as well as the casing wall in the battery box 1 that supports the battery cell 20 from below. This reduces the possibility of the heat exchanger 30 warping and interfering with the upper and lower structures of the battery cell 20, thus affecting assembly. The proportion of heat exchanger 30 on heat exchange surface 224 can be 85%, 86%, 87%, 88%, 89%, 90%, 91% or 92%, or any value within the above range.

[0109] Please refer to the reference. Figure 7 and Figure 8 In one embodiment of this application, along the first direction, the length of the insulating film 43 is less than the length of the insulating coating 41 located on the heat exchange surface 224, and the heat exchange element 30 is located on the side of the first overlap region 40a near the first end face 221.

[0110] In this embodiment, along the first direction, the coverage length of the insulating film 43 on the heat exchange surface 224 is set to be less than the coverage length of the insulating coating 41, so that the first overlapping area 40a can be located on the upper side of the battery cell 20. At this time, the length of the insulating coating 41 in the first overlapping area 40a is longer in the first direction, and the insulating coating 41 has better insulation performance than the insulating film 43 and is not easily damaged, thereby improving the insulation protection effect on the battery cell 20.

[0111] Please refer to Figure 7 In one embodiment of this application, the battery cell 20 further has a second end face 225, which is disposed at a relative interval from the first end face 221; in the first end face 221 and the second end face 225, the heat exchanger 30 is disposed close to the first end face 221; along the first direction, the proportion of the heat exchanger 30 on the heat exchange surface 224 is greater than or equal to 70% and less than or equal to 85%.

[0112] When one end face is formed as the bottom surface of the battery cell 20 as described above, the second end face 225 can be formed as the top surface of the battery cell 20 and can be located on the end cap 21 of the battery cell 20, and the pole post 21a can be disposed on the second end face 225.

[0113] In this embodiment, when the first overlapping area 40a is disposed on the upper side of the battery cell 20, the portion of the insulating film 43 that does not overlap with the insulating coating 41 will also occupy a portion of the heat exchange surface 224 on the upper side of the battery cell 20; simultaneously, the first overlapping area 40a also needs to occupy a portion of the heat exchange surface 224 on the upper side of the battery cell 20. Therefore, the heat exchanger 30 is disposed close to the first end face 221, and its proportion on the heat exchange surface 224 is set to 70% to 85%, which facilitates the arrangement of the portion of the insulating film 43 that does not overlap with the insulating coating 41 and the first overlapping area 40a, while also taking into account the heat exchange area between the heat exchanger 30 and the battery cell 20. The proportion of the heat exchanger 30 on the heat exchange surface 224 can be 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, or 85%, or any value within the above range.

[0114] Please refer to the reference. Figure 9 and Figure 10 In one embodiment of this application, the first overlapping region 40a at least partially overlaps with the projection of the heat exchanger 30 on the heat exchange surface 224.

[0115] In this embodiment, the projection of the first overlapping region 40a and the heat exchanger 30 onto the heat exchange surface 224 is made to overlap. This increases the length of the first overlapping region 40a in the first direction, thereby increasing the creepage distance between the battery cell 20 and the heat exchanger 30 and improving the insulation protection provided by the insulation structure 40 between the battery cell 20 and the heat exchanger 30. In this case, the first overlapping region 40a can be located on the lower side of the battery cell 20, for example, along the first direction, the length of the insulating film 43 is greater than the length of the insulating coating 41. Alternatively, the first overlapping region 40a can also be located on the upper side of the battery cell 20, for example, along the first direction, the length of the insulating film 43 is less than the length of the insulating coating 41. Or, the first overlapping region 40a can also be located on the lower and middle parts of the battery cell 20. This application does not limit the position of the first overlapping region 40a on the side surface 223 of the battery cell 20.

[0116] Please refer to the reference. Figure 9 and Figure 10 In one embodiment of this application, along the first direction, the first overlap region 40a covers the heat exchanger 30 with a coverage of greater than or equal to 80%.

[0117] The coverage of the heat exchanger 30 by the first overlapping region 40a can be the ratio of the length of the part of the first overlapping region 40a overlapping with the heat exchanger 30 in the first direction to the length of the heat exchanger 30 in the first direction.

[0118] In this embodiment, setting the coverage of the first overlap region 40a over the heat exchanger 30 to be greater than or equal to 80% allows for a larger contact area, ensuring the heat exchanger 30 fits smoothly against the outer side of the battery cell 20. This improves the uniformity of force distribution on the battery cell 20, enabling it to operate normally and stably. The coverage of the first overlap region 40a over the heat exchanger 30 can be 80%, 85%, 90%, 95%, or 100%, or any value within this range.

[0119] Please refer to the reference. Figure 11 and Figure 12 In one embodiment of this application, the coverage of the first overlapping area 40a over the heat exchanger 30 along the first direction can also be set to less than 80% in order to shorten the length of the first overlapping area 40a in the first direction, thereby reducing the amount of insulating film 43 and insulating coating 41 used, so as to reduce the manufacturing cost of battery device 100.

[0120] Please refer to the reference. Figure 11 and Figure 12 In one embodiment of this application, when the coverage of the first overlapping area 40a over the heat exchanger 30 is less than 80%, the battery device 100 may include a filler layer 50 to ensure that the heat exchanger 30 is flatly attached to the outside of the battery cell 20. For example, in some embodiments, when the first overlapping area 40a is located on the side of the heat exchanger 30 near the first end face 221, that is, when the first overlapping area 40a is located near the lower side of the heat exchanger 30, the filler layer 50 may be disposed between the insulating film 43 and the heat exchanger 30, and disposed corresponding to the portion of the heat exchanger 30 that is misaligned with the first overlapping area 40a. In this case, part of the heat exchanger 30 may be attached to the insulating film 43 located outside the insulating coating 41, and part may be attached to the filler layer 50 located outside the insulating film 43.

[0121] Alternatively, in some embodiments, when the first overlapping region 40a is located on the side of the heat exchanger 30 away from the first end face 221, that is, when the first overlapping region 40a is disposed near the upper side of the heat exchanger 30, the filler layer 50 can be disposed between the insulating coating 41 and the heat exchanger 30, and disposed corresponding to the portion of the heat exchanger 30 that is misaligned with the first overlapping region 40a. In this case, part of the heat exchanger 30 can be attached to the insulating film 43 located outside the insulating coating 41, and part can be attached to the filler layer 50 located outside the insulating coating 41.

[0122] In one embodiment of this application, the filler layer 50 is made of a thermally conductive material.

[0123] In this embodiment, the filler layer 50 is made of a thermally conductive material so that it does not hinder the heat exchange between the battery cell 20 and the heat exchanger 30, allowing the heat exchanger 30 to perform normal and stable heat exchange with the battery cell 20. The thermally conductive material can be thermally conductive adhesive or a thermally conductive pad.

[0124] Please refer to the reference. Figure 5 and Figure 6 In one embodiment of this application, a portion of the insulating film 43 extends to the first end face 221 and is stacked with the insulating coating 41 to form a second overlapping area 40b; the second overlapping area 40b is annular in shape and is arranged around the first end face 221 in a circumferential direction.

[0125] In this embodiment, a portion of the insulating film 43 extends to the first end face 221, forming a second overlapping area 40b with the insulating coating 41 located on the first end face 221. This further increases the creepage distance between the battery cell 20 and external structures such as the external heat exchanger 30, thereby improving the insulation protection effect of the insulating structure 40 between the battery cell 20 and the heat exchanger 30. Furthermore, the second overlapping area 40b is a ring shape arranged circumferentially around the first end face 221, ensuring insulation protection on all circumferential sides of the battery cell 20. Within the second overlapping area 40b, the insulating film 43 is located outside the insulating coating 41. That is, the insulating film 43 is located on the side of the insulating coating 41 facing away from the first end face 221.

[0126] In one embodiment of this application, the second overlapping region 40b covers the first end face 221 with a coverage of greater than or equal to 10% and less than or equal to 25%.

[0127] In this embodiment, the coverage of the second overlapping area 40b over the first end face 221 is set to 10% to 25%. This ensures that the width of the second overlapping area 40b is not too small, thereby improving the insulation protection effect. Simultaneously, it prevents the width of the second overlapping area 40b from being too large, allowing the insulating coating 41 to still have a significant proportion. Compared to the insulating film 43, the insulating coating 41 has a stronger bonding force with both the battery cell 20 and the battery box 1. This improves the stability of the battery cell 20 when connected to the battery box 1 through the insulating coating 41. The coverage of the second overlapping area 40b over the first end face 221 can be 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, or 25%, or any value within the above range.

[0128] Please refer to the reference. Figure 5 and Figure 6In one embodiment of this application, a portion of the insulating coating 41 extends to all sides 223 and is stacked with the insulating film 43 to form a first overlapping area 40a in the shape of a ring.

[0129] In this embodiment, a portion of the insulating coating 41 is extended to all sides 223 to form a ring-shaped first overlapping area 40a, which can provide insulation protection on all circumferential sides of the battery cell 20, thereby further improving the insulation protection effect of the insulating structure 40 on the battery cell 20.

[0130] Please refer to the reference. Figures 3 to 6 In one embodiment of this application, the battery device 100 includes a battery box 1, a battery cell 20, a heat exchanger 30, and an insulation structure 40; the battery box 1 has a support surface 121; the battery cell 20 is disposed in the battery box 1, and the battery cell 20 has a first end face 221 and a plurality of side faces 223; the first end face 221 is connected to the support surface 121, and the plurality of side faces 223 are arranged around the first end face 221 in a circumferential direction; at least one side face 223 is formed as a heat exchange surface 224, and the heat exchanger 30 is heat-exchange connected to the heat exchange surface 224; the insulation structure 40 includes an insulating coating 41 and an insulating film 43, the insulating coating 41 is disposed on the first end face 221, and the insulating film 43 is disposed on the side face 223; wherein, a portion of the insulating coating 41 extends at least to the heat exchange surface 224 and is stacked with the insulating film 43 to form a first overlap area 40a. The normal direction of the first end face 221 is defined as the first direction. The first overlapping area 40a does not overlap with the projection of the heat exchanger 30 onto the heat exchange surface 224 and is arranged along the first direction. Along the first direction, the proportion of the first overlapping area 40a on the heat exchange surface 224 is greater than or equal to 2% and less than or equal to 6%. Along the first direction, the length of the insulating film 43 is greater than the length of the insulating coating 41 located on the heat exchange surface 224, and the heat exchanger 30 is located on the side of the first overlapping area 40a away from the first end face 221. The coverage area of ​​the heat exchanger 30 on the heat exchange surface 224 extends from the center of the heat exchange surface 224 to both sides along the first direction; along the first direction, the proportion of the heat exchanger 30 on the heat exchange surface 224 is greater than or equal to 85% and less than or equal to 92%. A portion of the insulating film 43 extends to the first end face 221 and is stacked with the insulating coating 41 to form a second overlapping area 40b; the second overlapping area 40b is annular and is arranged around the circumference of the first end face 221. The second overlapping area 40b covers the first end face 221 with a coverage of greater than or equal to 10% and less than or equal to 25%. A portion of the insulating coating 41 extends to all sides 223 and is laminated with the insulating film 43 to form a ring-shaped first overlapping area 40a.

[0131] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A battery device, characterized in that, include: A battery box, wherein the battery box has a supporting surface inside; A battery cell, wherein the battery cell is disposed inside the battery box, and the battery cell has a first end face and multiple side faces; The first end face is connected to the support surface, and a plurality of the side faces are arranged circumferentially around the first end face; A heat exchanger, wherein at least one of the said side surfaces is formed as a heat exchange surface, and the heat exchanger is heat-exchange connected to the heat exchange surface; and An insulating structure, comprising an insulating coating and an insulating film, wherein the insulating coating is disposed on the first end face and the insulating film is disposed on the side face; The insulating coating extends at least to the heat exchange surface and overlaps with the insulating film to form a first overlapping area.

2. The battery device as claimed in claim 1, characterized in that, The normal direction of the first end face is defined as the first direction. The first overlapping area does not overlap with the projection of the heat exchanger on the heat exchange surface and is arranged along the first direction.

3. The battery device as claimed in claim 2, characterized in that, Along the first direction, the first overlapping area accounts for more than or equal to 2% and less than or equal to 6% of the heat exchange surface.

4. The battery device as claimed in claim 2, characterized in that, Along the first direction, the length of the insulating film is greater than the length of the insulating coating on the heat exchange surface, and the heat exchange element is located on the side of the first overlapping area away from the first end face.

5. The battery device as claimed in claim 4, characterized in that, The heat exchanger covers an area on the heat exchange surface that extends from the center of the heat exchange surface to both sides along the first direction. Along the first direction, the heat exchange element occupies more than or equal to 85% and less than or equal to 92% of the heat exchange surface.

6. The battery device as claimed in claim 2, characterized in that, Along the first direction, the length of the insulating film is less than the length of the insulating coating on the heat exchange surface, and the heat exchange element is located on the side of the first overlapping area near the first end face.

7. The battery device as claimed in claim 6, characterized in that, The battery cell also has a second end face, which is spaced apart from the first end face; In the first end face and the second end face, the heat exchanger is disposed close to the first end face; Along the first direction, the heat exchange element occupies more than or equal to 70% and less than or equal to 85% of the heat exchange surface.

8. The battery device as claimed in claim 1, characterized in that, The first overlapping area at least partially overlaps with the projection of the heat exchanger onto the heat exchange surface.

9. The battery device as claimed in claim 8, characterized in that, The normal direction of the first end face is defined as the first direction, and along the first direction, the coverage of the first overlapping area on the heat exchanger is greater than or equal to 80%.

10. The battery device as claimed in claim 8, characterized in that, The first overlapping area covers a portion of the heat exchanger, and in the first overlapping area, the insulating film is located outside the insulating coating. The battery device also includes a filler layer. The first overlapping area is located on the side of the heat exchanger close to the first end face, and the filling layer is disposed between the insulating film and the heat exchanger, and is disposed corresponding to the part of the heat exchanger that is misaligned with the first overlapping area; Alternatively, the first overlapping area is located on the side of the heat exchanger away from the first end face, and the filling layer is disposed between the insulating coating and the heat exchanger, and is disposed corresponding to the portion of the heat exchanger that is misaligned with the first overlapping area.

11. The battery device as claimed in claim 10, characterized in that, The normal direction of the first end face is defined as the first direction. Along the first direction, the coverage of the first overlapping area on the heat exchanger is less than 80%.

12. The battery device as claimed in claim 10, characterized in that, The filling layer is made of a thermally conductive material.

13. The battery device as claimed in claim 1, characterized in that, A portion of the insulating film extends to the first end face and is stacked with the insulating coating to form a second overlapping area; The second overlapping area is ring-shaped and is arranged around the circumference of the first end face.

14. The battery device as claimed in claim 13, characterized in that, The second overlapping area covers the first end face with a coverage of greater than or equal to 10% and less than or equal to 25%.

15. The battery device according to any one of claims 1 to 14, characterized in that, A portion of the insulating coating extends to all of the sides and overlaps with the insulating film to form a ring-shaped first overlapping area.

16. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1 to 15.

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