Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device, the battery device comprises a box body, a heat exchange assembly and a battery monomer, the heat exchange assembly and the battery monomer are accommodated in the box body, and the heat exchange assembly exchanges heat with the battery monomer; the battery monomer comprises a second shell, a first shell and an electrode assembly, the second shell accommodates the electrode assembly, the first shell is provided with a first accommodating space, the second shell is accommodated in the first accommodating space, and a gap is formed between the first shell and the second shell. According to the battery device, the physical isolation layer is additionally arranged between the second shell and the heat exchange assembly, so that the insulation failure risk caused by electrolyte leakage or heat exchange medium leakage can be reduced, and the insulation performance and reliability of the battery device are improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to battery devices and electrical devices. Background Art

[0002] New energy batteries are increasingly widely used in life and industries. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in the energy storage field and so on.

[0003] In new energy vehicles equipped with batteries, the batteries can be used to provide power in whole or in part. In the energy storage field, the batteries can be installed in an energy storage box or directly installed on the user side. In the application scenarios of battery devices, there are adverse situations where the insulation between battery cells and heat exchange components fails. Therefore, how to improve the insulation reliability of battery devices is one of the research topics in the industry. Summary of the Utility Model

[0004] To solve the above technical problems, the present application provides a battery device and an electrical device.

[0005] The present application is implemented through the following technical solutions.

[0006] In a first aspect of an embodiment of the present application, a battery device is provided. The battery device includes a box body, a heat exchange component and battery cells. The heat exchange component and the battery cells are accommodated in the box body, and the heat exchange component exchanges heat with the battery cells. The battery cell includes a second outer shell, a first outer shell and an electrode assembly. The second outer shell accommodates the electrode assembly. The first outer shell has a first accommodation space, the second outer shell is accommodated in the first accommodation space, and there is a gap between the first outer shell and the second outer shell.

[0007] Since the second outer shell is accommodated in the first accommodation space of the first outer shell and there is a gap between the second outer shell and the first outer shell, the first shell provides an additional physical protection layer, and a physical isolation can be formed between the second shell and the heat exchange component, avoiding direct contact between the second shell and the heat exchange component, reducing the risk of insulation failure caused by electrolyte leakage or heat exchange medium leakage, and also reducing the risk of short circuit caused by external impact vibration, thereby improving the insulation performance and reliability of the battery device.

[0008] In some embodiments, an insulating layer is provided on a surface of the first outer shell close to the second outer shell.

[0009] Since the insulating layer is provided on the inner surface of the first outer shell, the insulating layer can provide an additional protection layer, reducing the possibility of direct contact between the liquid leakage and the second outer shell, thereby reducing the risk of insulation failure and improving the reliability of the battery cell.

[0010] In some embodiments, in the gap, a heat insulating member and / or a buffer member are disposed between the second housing and the first housing.

[0011] Since a heat insulating member and / or a buffer member are disposed between the second housing and the first housing, an additional insulating structure is formed therebetween, further improving the insulation performance of the battery cell and effectively reducing the risk of insulation failure between the battery cell and the heat exchange component. In addition, the heat insulating member can reduce the heat transfer between adjacent battery cells, thereby improving the thermal management ability of the entire battery device; while the buffer member can not only absorb the expansion force of the electrode assembly, but also enhance the anti-vibration and shock resistance ability of the battery cell to a certain extent. And disposing the heat insulating member and / or the buffer member inside the battery cell also improves the space utilization rate of the battery cell to a certain extent.

[0012] In some embodiments, the second housing has the same shape as the first housing.

[0013] Thus, since the second housing has the same shape as the first housing, it is convenient to assemble the two, improving the production efficiency.

[0014] In some embodiments, a plurality of the battery cells are arranged in a first direction. The first housing has two first side walls arranged along the first direction, and the second housing has two second side walls arranged along the first direction. A heat insulating member is disposed between the first side wall and the second side wall.

[0015] This can block the heat transfer between the battery cells arranged in the first direction, reduce the risk of heat diffusion, and improve the thermal management ability of the battery device.

[0016] In some embodiments, the first housing has two third side walls arranged along a second direction, and the second housing has two fourth side walls arranged along the second direction. A buffer member is disposed between the third side wall and the fourth side wall, and the second direction is perpendicular to the first direction.

[0017] Thus, the anti-vibration and shock resistance ability of the battery cell is enhanced to a certain extent, the influence of vibration and shock on the electrode assembly is reduced, and the stability of the battery cell is improved.

[0018] In some embodiments, the first housing includes a first end cap and a first housing body. One end of the first housing body along a third direction forms a first opening, and the first end cap closes the first opening; at least one convex portion is provided at the edge of the first end cap, and a concave portion corresponding to the convex portion is provided at the edge of the first opening, and the convex portion and the concave portion are in plug-in fit.

[0019] Thus, the first end cap and the first housing are in a plug-in fit, which not only facilitates precise positioning during assembly, improves the assembly efficiency of the battery cell, but also enhances the sealing effect of the first housing after assembly, further enhancing the reliability of the battery cell.

[0020] In some embodiments, along the third direction, the other end of the first housing has a bottom wall, and a thermal conductive adhesive layer is provided on the side of the bottom wall close to the second outer shell.

[0021] Thus, while fixing the second outer shell, the heat conduction efficiency of the battery cell can be improved, and the heat exchange efficiency of the battery cell can be further enhanced. In addition, the thermal conductive adhesive layer can also disperse heat and avoid the adverse situation of local temperature rise.

[0022] In some embodiments, the first outer shell includes a first end cap and a first housing. The first end cap is a non-metallic part, and the first housing is a metallic part.

[0023] Thus, the first end cap can be assembled with the first housing by non-welding means, improving the assembly efficiency of the battery cell.

[0024] In some embodiments, along the third direction, the second outer shell includes a second end cap and a second housing. Along the third direction, the second housing is formed with a second opening, and the second end cap closes the second opening; along the third direction, the second end cap and the first end cap are located on the same side, the second end cap is provided with electrode terminals, and the first end cap is provided with an electrode lead-out hole for leading out the electrode terminals.

[0025] Since the second end cap closes the second opening, the sealing effect of the second outer shell is improved. In addition, since the second end cap and the first end cap are located on the same side, it is easier to align and position during the assembly process, improving the assembly efficiency. In addition, the first end cap is provided with an electrode lead-out hole for leading out the electrode terminals, so it is convenient for the battery cell to input and output electric energy.

[0026] In some embodiments, the thickness of the first housing is less than that of the second housing, and the thickness of the first housing is 0.2 - 0.5 mm.

[0027] Thus, the thickness of the first housing is within a suitable range, which can reduce the space occupied by the battery cell and its weight to a certain extent, improving the space utilization rate and energy density of the battery device. On the other hand, the heat conduction rate of the first housing is also improved, reducing its influence on heat exchange.

[0028] The second aspect of the embodiments of the present application provides an electrical device, including the battery device according to the first aspect of the embodiments of the present application, and the battery device is used to store or provide electric energy.

[0029] Since the electrical device includes the battery device described in the first aspect of the embodiments of the present application, the insulation performance and reliability of the electrical device can be improved.

[0030] Through the present application, the risk of insulation failure caused by electrolyte leakage or heat transfer medium leakage can be reduced, and the insulation performance and reliability of the battery device can be improved. Description of the Drawings

[0031] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0032] Figure 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application;

[0033] Figure 2 is a three-dimensional exploded view of a battery device provided by some embodiments of the present application;

[0034] Figure 3 is a three-dimensional exploded view of a battery device provided by other embodiments of the present application;

[0035] Figure 4 is a three-dimensional exploded view of a battery cell provided by some embodiments of the present application;

[0036] Figure 5 is a schematic structural diagram of a battery cell provided by some embodiments of the present application;

[0037] Figure 6 is a schematic structural diagram of a first housing provided by some embodiments of the present application;

[0038] Figure 7 is a three-dimensional exploded view of a first outer shell provided by some embodiments of the present application;

[0039] Figure 8 is Figure 7 a partial enlarged view of part A in

[0040] Description of the Reference Numerals

[0041] 100. Battery device; 101. Box body; 102. Cover body; 103. Bottom plate; 104. Heat exchange component; 105. Battery cell; 200. Controller; 300. Motor; 10. Second outer shell; 10A. Second side wall; 10B. Fourth side wall; 11. Second end cover; 11A. Electrode terminal; 12. Second housing; 13. Second opening; 20. First outer shell; 20A. First side wall; 20B. Third side wall; 20C. Bottom wall; 21. First end cover; 21A. Convex part; 21B. Electrode lead-out hole; 22. First housing; 23. First opening; 23A. Concave part; 30. Electrode assembly; 40. Heat insulation part; 50. Buffer part; 60. Insulation layer; 70. Thermal conductive adhesive layer; 1000. Vehicle; S1. Second accommodation space; S2. First accommodation space. Detailed implementation manners

[0042] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in this specification and the above drawings are intended to cover non-exclusive inclusion.

[0044] In the description of the embodiments of the present application, technical terms such as "first", "second", "third", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0045] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0046] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0047] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0048] In the description of the embodiments of the present application, 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, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0049] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0050] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical terms "parallel" and "perpendicular" are both allowed to have a certain degree of tolerance and / or error, including the situations of being approximately parallel and approximately perpendicular.

[0051] Below, this application is described in detail.

[0052] At present, new energy batteries are increasingly used in life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0053] In an application scenario, a battery device may face various adverse situations, such as the intrusion of impurity particles, electrolyte leakage, and heat exchange medium leakage. These adverse situations may cause the potential difference between the battery cell and the heat exchange component to disappear, that is, the two are at the same potential, resulting in insulation failure and seriously affecting the safety and reliability of the battery device. Therefore, how to improve the reliability of the battery device is one of the research topics in the industry.

[0054] Through research and design, adding a physical isolation measure between the electrode component of the battery cell and the heat exchange component can greatly reduce the risk of insulation failure between the two. Specifically, multiple outer shells can be set outside the electrode component, and a certain gap can be left between these outer shells. This structural design can not only provide an additional physical barrier but also further enhance the insulation effect by filling the gap with insulating parts. This design can not only reduce the risk of insulation failure between the electrode component and the heat exchange component but also improve the insulation reliability of the entire battery device.

[0055] Based on such a design concept, this application designs a battery device. The battery device includes a box body, a heat exchange component, and a battery cell. The heat exchange component and the battery cell are accommodated in the box body, and the heat exchange component and the battery cell perform heat exchange; the battery cell includes a second outer shell, a first outer shell, and an electrode component. The second outer shell accommodates the electrode component. The first outer shell has a first accommodation space. The second outer shell is accommodated in the first accommodation space, and there is a gap between the first outer shell and the second outer shell.

[0056] Since the second outer shell is accommodated in the first accommodation space of the first outer shell and there is a gap between the second outer shell and the first outer shell, the first shell provides an additional physical protection layer, and a physical isolation can be formed between the second shell and the heat exchange component to prevent the second shell from directly contacting the heat exchange component, reducing the risk of insulation failure caused by electrolyte leakage or heat exchange medium leakage, and also reducing the risk of short circuit caused by external impact and vibration, improving the insulation performance and reliability of the battery device.

[0057] In the following embodiments, for the convenience of description, the electrical device in an embodiment of this application is taken as the vehicle 1000 as an example for description. The following is described with reference to the accompanying drawings.

[0058] Figure 1 The structural schematic diagram of the vehicle 1000 provided for some embodiments of this application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. As Figure 1As shown, a battery device 100 is provided inside the vehicle 1000. The battery device 100 can be arranged at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. For example, the battery device 100 can serve as the operating power source of the vehicle 1000. The vehicle 1000 can 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, it is used for the working power requirements during the start-up, navigation, and driving of the vehicle 1000.

[0059] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000, but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0060] In the embodiments of the present application, the battery cell can be a secondary battery. A secondary battery refers to a battery cell that can be activated by charging after discharging to continue use.

[0061] The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc. The embodiments of the present application do not limit this.

[0062] Although not shown, generally, the battery cell includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) shuttle back and forth between the positive electrode and the negative electrode for insertion and extraction. The separator is arranged between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes and at the same time allow the active ions to pass through.

[0063] In some embodiments, the electrode assembly is provided with tabs (not shown). The tabs can conduct the current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0064] In some embodiments, the electrode assembly can be in a wound structure, a stacked structure, or a hybrid structure of winding and stacking.

[0065] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0066] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc. The present application has no special limitation.

[0067] In some embodiments, the outer casing may be a sealed structure or a non-sealed structure. As an example, when the outer casing is a non-sealed structure, the outer casing serves to protect the electrode assembly, and a sealing bag is further included between the outer casing and the electrode assembly, and the sealing bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag may be a bag-shaped insulating member or an aluminum-plastic film. When the outer casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0068] The emissions from the battery cells mentioned in this application include but are not limited to: electrolyte, dissolved or fragmented positive and negative electrode plates, debris of the separator, high-temperature and high-pressure gases generated by the reaction, flames, and so on.

[0069] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel, or in a hybrid connection through a busbar component.

[0070] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly may be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells with cable ties.

[0071] In some embodiments, the battery apparatus may be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0072] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box body by fixing the battery module in the box body.

[0073] As an example, the battery cell assembly may also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0074] As an example, the box body may include a first box body and a second box body. The first box body and the second box body are snapped together so that a closed space is formed inside the box body to accommodate the battery cell assembly. The "closed" here means covered or closed, which may be sealed or non-sealed. The first box body may be a top cover or a bottom plate.

[0075] As an example, the box body may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0076] As an example, the box body can be part of the chassis structure of a vehicle. For example, the top cover of the box body can become at least part of the floor of the vehicle, or the frame of the box body can become at least part of the cross beams and longitudinal beams of the vehicle.

[0077] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box body with a door provided on at least one side thereof. The energy storage device includes an energy storage container, an energy storage electrical cabinet, etc.

[0078] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells and battery devices. For example, mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0079] Below, with reference to Figures 3 to 6 Some embodiments of the present application will be described in detail.

[0080] Figure 3 A three-dimensional exploded view of the battery device provided for some other embodiments of the present application; Figure 4 A three-dimensional exploded view of the battery cell provided for some embodiments of the present application; Figure 5 A structural diagram of the battery cell provided for some embodiments of the present application; Figure 6 A structural diagram of the first housing provided for some embodiments of the present application; Figure 7 A three-dimensional exploded view of the first outer shell provided for some embodiments of the present application; Figure 8 For Figure 7 The partial enlarged view at A in

[0081] In some embodiments of the present application, for the convenience of description, a first direction, a second direction, and a third direction are set. The directions where the first direction, the second direction, and the third direction are located are directions that cross each other. Here, crossing each other includes perpendicular crossing to each other. For the convenience of understanding the embodiments of the present application, in the embodiments shown in FIGS. 3 to 6, an example where the first direction, the second direction, and the third direction are perpendicular to each other is used for description. However, those skilled in the art should understand that the embodiments of the present application are not limited to the case where the three directions are perpendicular to each other. For the convenience of description, as shown by the arrows in FIGS. 3 to 6, the direction where the arrow Z is located is set as the third direction, the direction where the arrow X is located is set as the first direction, and the direction where the arrow Y is located is set as the second direction. Sometimes, the direction pointed by the arrow Z along the third direction is also called "upward", and its opposite direction is called "downward".

[0082] In a first aspect of the embodiments of the present application, a battery device 100 is provided. In the embodiments of the present application, the battery device 100 includes a box body 101, a heat exchange component 104, and battery cells 105. The heat exchange component 104 and the battery cells 105 are accommodated in the box body 101, and heat exchange occurs between the heat exchange component 104 and the battery cells 105. The battery cell 105 includes a second outer shell 10, a first outer shell 20, and an electrode assembly 30. The second outer shell 10 houses the electrode assembly 30. The first outer shell 20 has a first accommodation space S2, and the second outer shell 10 is accommodated in the first accommodation space S2. There is a gap between the first outer shell 20 and the second outer shell 10.

[0083] Optionally, the box body 101 may include a first box body 101 and a second box body 101. The first box body 101 and the second box body 101 are snapped together so that a closed space is formed inside the box body 101 to accommodate the battery cell 105 components. Here, "closed" means covered or closed, which can be sealed or non-sealed. The first box body 101 can be a cover body 102 or a bottom plate 103. The bottom plate 103 can be formed in a generally flat shape or in a tray shape with side walls and a bottom wall. The embodiments of the present application do not have special limitations on this.

[0084] Optionally, the box body 101 can adopt various structures. Optionally, the box body 101 can be a hollow structure with one side open. When the cover body 102 is covered on the open side, a box body 101 with a placement space is formed. Similarly optionally, the box body 101 can also be constructed as a closed box body 101.

[0085] Exemplarily, Figure 2 is a three-dimensional exploded view of the battery device 100 provided by the embodiments of the present application. As Figure 2 shown, the battery device 100 includes a box body 101, a heat exchange component 104, and at least one battery cell 105. The box body 101 includes a bottom plate 103 and a cover body 102. The cover body 102 covers above the bottom plate 103, thereby forming an accommodation space for the battery cell 105. The heat exchange component 104 is disposed at the bottom of the box body 101, contacts the battery cell 105, and exchanges heat with it.

[0086] Another exemplarily, Figure 3 is a three-dimensional exploded view of the battery device 100 provided by some other embodiments of the present application. The battery device 100 includes a box body 101, a heat exchange component 104, and at least one battery cell 105. The box body 101 includes a bottom plate 103 and a cover body 102. The cover body 102 covers above the bottom plate 103, thereby forming an accommodation space for the battery cell 105. The heat exchange component 104 contacts the large surface of the battery cell 105 and exchanges heat with it.

[0087] Optionally, the heat exchange component 104 may include at least one heat exchange plate. The heat exchange plate may be disposed between adjacent battery cells 105, or the heat exchange plate may be disposed between the battery cell 105 and the bottom plate 103 to support the battery cell 105. The heat exchange component 104 may further include a heat exchange pipeline, a liquid inlet, a liquid outlet, etc., which are not limited in the embodiments of the present application.

[0088] It can be understood that the heat exchange component 104 can perform heat exchange with the battery cell 105 to heat or cool the battery cell 105. Exemplarily, when the battery cell 105 operates under cold conditions, the battery cell 105 can be heated through the heat exchange component 104. During the operation of the battery cell 105, as the temperature of the battery cell 105 rises, the battery cell 105 can be cooled through the heat exchange component 104 to prevent further temperature rise of the battery cell 105, which is beneficial to ensuring the reliable performance of the battery cell 105. Exemplarily, as Figure 4 , Figure 5 shown, the battery cell 105 includes a second housing 10, a first housing 20 and an electrode assembly 30. The second housing 10 has a second accommodation space S1 capable of accommodating the electrode assembly 30.

[0089] Optionally, the second housing 10 and the first housing 20 may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum plastic film, etc. The material of the first housing 20 may be the same as or different from that of the second housing 10.

[0090] Optionally, the battery cell 105 may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc., and there is no special limitation in the embodiments of the present application. The shapes of the second housing 10 and the first housing 20 may also be cylindrical, prismatic, etc., which are not listed in the embodiments of the present application.

[0091] Optionally, the shapes of the second housing 10 and the first housing 20 may be the same or different.

[0092] Optionally, the second housing 10 and the first housing 20 may be a sealed structure or a non-sealed structure. As an example, when the second housing 10 is a non-sealed structure, the second housing 10 functions to protect the electrode assembly 30. A sealing bag may further be included between the second housing 10 and the electrode assembly 30, and the sealing bag is used to encapsulate the electrode assembly 30 and the electrolyte. Specifically, the sealing bag may be a bag-shaped insulating part or an aluminum plastic film. When the second housing 10 is a sealed structure, it is used to encapsulate components such as the electrode assembly 30 and the electrolyte.

[0093] Exemplarily, as Figure 4As shown, the first outer shell 20 has a first accommodation space S2, the second outer shell 10 is accommodated in the first accommodation space S2, and there is a gap between the first outer shell 20 and the second outer shell 10.

[0094] It can be understood that the first outer shell 20 is disposed outside the second outer shell 10. In the battery device 100, the first outer shell 20 is located between the second outer shell 10 and the heat exchange component 104, and the first outer shell 20 and the gap form a physical barrier layer. If the electrolyte or the heat exchange medium leaks accidentally, the first outer shell 20 can prevent these liquids from directly contacting the second outer shell 10 or the heat exchange component 104, avoiding the adverse situations such as short circuit or insulation damage caused by liquid contact, thereby reducing the risk of insulation failure to a certain extent and improving the insulation performance and reliability of the battery device 100.

[0095] In addition, by forming an isolation area between the two outer shells, the resistance to environmental factors (such as moisture, smoke, particles, etc.) is also improved to a certain extent, preventing them from directly contacting the second outer shell 10 and affecting the insulation performance of the battery cell 105.

[0096] Optionally, in the gap between the second outer shell 10 and the first outer shell 20, an insulating member can be provided to further reduce the risk of insulation failure, or the air gap can be used to reduce the risk of short circuit between the battery cell 105 and the heat exchange component 104 caused by mechanical damage (such as extrusion and puncture).

[0097] Since the second outer shell 10 is accommodated in the first accommodation space S2 of the first outer shell 20 and there is a gap between the second outer shell 10 and the first outer shell 20, the first housing 22 provides an additional physical protection layer, and a physical isolation can be formed between the second housing 12 and the heat exchange component 104, avoiding direct contact between the second housing 12 and the heat exchange component 104, reducing the risk of insulation failure caused by electrolyte leakage or heat exchange medium leakage, and also reducing the short circuit risk caused by external impact and vibration, improving the insulation performance and reliability of the battery device 100.

[0098] In the embodiment of the present application, an insulating layer 60 is provided on the surface of the first outer shell 20 close to the second outer shell 10.

[0099] Optionally, the insulating layer 60 can be an insulating coating, including but not limited to silicone resin coating, polyurethane coating, epoxy resin coating, polyimide coating, ceramic coating, etc. The thickness can be set to the micron level.

[0100] Exemplarily, as Figure 4 、 Figure 6 shown, the first outer shell 20 includes a first end cap 21 and a first housing 22. The insulating layer 60 can be provided on the inner surface of the first housing 22.

[0101] In a specific embodiment, asFigure 6 As shown, the insulating layer 60 can be disposed on the inner surfaces of the first sidewall 20A and the third sidewall 20B.

[0102] In a specific embodiment, the insulating layer 60 can also be disposed on the inner side of the bottom wall of the first housing 22 along the third direction.

[0103] In the embodiment of the present application, other insulating and protective structures can also be provided between the first outer shell 20 and the heat exchange component 104. For example, an insulating film (such as a blue film) is coated on the surface of the first outer shell 20, and an insulating coating is provided on the surface of at least a part (such as a heat exchange plate) of the heat exchange component 104. The insulating and protective effect between the battery cell 105 and the heat exchange component 104 is improved.

[0104] Since the insulating layer 60 is disposed on the inner surface of the first outer shell 20, the insulating layer 60 can provide an additional protective layer, reducing the possibility of direct contact between the liquid leakage and the second housing 12, thereby reducing the risk of insulation failure and improving the reliability of the battery cell 105.

[0105] In the embodiment of the present application, a heat insulating member 40 and / or a buffer member 50 are disposed between the second outer shell 10 and the first outer shell 20 in the gap.

[0106] Optionally, the heat insulating member 40 can be a heat insulating layer with a certain thickness.

[0107] Optionally, the heat insulating member 40 includes a laminate of one or both of a heat insulating layer and a phase change material layer. Among them, the heat insulating layer refers to a material layer that mainly plays a heat insulating role through the physical isolation of its own structure, and it contains materials that play a heat insulating role through the physical isolation of their own structures, such as a ceramic material layer. The phase change material layer refers to a material layer that mainly plays a heat insulating role through the phase change endotherm of the phase change material, and it contains a phase change material.

[0108] It can be understood that the heat insulating member 40 can include a heat insulating layer without a phase change material layer; it can also include a phase change material layer without a heat insulating layer. It can also include a laminate of a heat insulating layer and a phase change material layer at the same time. For example, the heat insulating member 40 includes a three-layer sandwich structure of a heat insulating layer, a phase change material layer, and a heat insulating layer. In this way, heat insulation can be achieved through different channels, improving the heat insulation performance.

[0109] It can be understood that the heat insulation member 40 can block the heat transfer between two adjacent battery cells 105 to a certain extent, thereby enhancing the heat insulation performance of the battery cell 105 and reducing the heat conduction between the battery cells 105. Specifically, when a certain battery cell 105 undergoes thermal runaway, the heat insulation member 40 can effectively inhibit the heat of the high-temperature battery cell 105 from spreading to the adjacent battery cell 105, thereby reducing the risk of thermal diffusion. This not only helps protect the unaffected battery cells 105 from high temperatures but also improves the thermal runaway resistance of the entire battery device 100.

[0110] By providing the heat insulation member 40, an effective heat barrier can be formed to ensure that even if an individual battery cell 105 fails, thermal runaway can be maximally prevented from spreading in the entire battery system to form thermal diffusion, thereby enhancing the reliability of the battery device 100.

[0111] Optionally, the heat insulation member 40 can be provided only in the gaps at the large surface positions of the battery cells 105. The above-mentioned large surface refers to the largest surface of the battery cell 105. Exemplarily, as Figure 4 shown, the two side surfaces along the first direction are the large surfaces of the battery cell 105, and the heat insulation member 40 is provided in the gaps on both sides along the first direction.

[0112] Optionally, the buffer member 50 can have insulating properties and be capable of generating a certain amount of deformation. During the expansion of the electrode assembly 30, providing the buffer member 50 can not only provide a certain binding force for the expansion of the electrode assembly 30 to reduce the risk of the electrode assembly 30 wrinkling during expansion but also reduce the risk of the electrode assembly 30 deforming due to excessive binding force during expansion, which is beneficial to further reducing the risk of lithium plating occurring in the electrode assembly 30 and thus improving the reliable performance of the battery cell 105.

[0113] Optionally, the buffer member 50 can be in various shapes, such as straight strip shape, plate shape, etc. Among them, the buffer member 50 can be made of various materials, such as silica gel, rubber, foam, etc.

[0114] In a specific embodiment, the buffer member 50 includes at least one of microcellular foamed polypropylene foam (MPP) and silicone foam.

[0115] It can be understood that microcellular foamed polypropylene foam is a foam made of microcellular foamed polypropylene, which has better softness, shock absorption, and characteristics such as lightness, durability, and environmental protection.

[0116] By making the buffer member 50 a foam, the buffer member 50 can have characteristics such as better plasticity, softness, shock absorption performance, light weight, and low cost, which can facilitate the design, molding, and layout of the buffer member 50, so that the buffer member 50 can fit the design and can effectively play its role.

[0117] Optionally, the buffer member 50 can be fixedly connected to the second housing 12 or the first housing 22 by means of bonding, hot melting, etc.

[0118] Exemplarily, the battery cell 105 can be a prismatic battery, and heat insulation members 40 are all arranged between the second housing 10 and the first housing 20 in the first direction and the second direction.

[0119] Another exemplarily, the battery cell 105 can be a prismatic battery, and buffer members 50 are all arranged between the second housing 10 and the first housing 20 in the first direction and the second direction.

[0120] Yet another exemplarily, the battery cell 105 can be a prismatic battery, and heat insulation members 40 and buffer members 50 are arranged between the second housing 10 and the first housing 20. Either one of them can be arranged in the first direction, and the other can be arranged in the second direction.

[0121] Since heat insulation members 40 and / or buffer members 50 are arranged between the second housing 10 and the first housing 20, an additional insulation structure is formed therebetween, further improving the insulation performance of the battery cell 105 and effectively reducing the risk of insulation failure between the battery cell 105 and the heat exchange component 104. In addition, the heat insulation member 40 can reduce the heat transfer between adjacent battery cells 105, thereby improving the thermal management ability of the entire battery device 100; while the buffer member 50 can not only absorb the expansion force of the electrode assembly 30, but also enhance the anti-vibration and shock resistance ability of the battery cell 105 to a certain extent. And arranging the heat insulation member 40 and / or the buffer member 50 in the battery cell 105 also improves the space utilization rate of the battery cell 105 to a certain extent.

[0122] In the embodiment of the present application, as Figure 4 、 Figure 5 shown, the second housing 10 and the first housing 20 have the same shape.

[0123] Optionally, the second housing 10 and the first housing 20 (hereinafter collectively referred to as the housing) can be of various shapes and various sizes. The shape of the housing can be a cylinder, a cuboid, a prism or other shapes. The prism is, for example, a hexagonal prism, etc. It can be understood that the shape of the housing can be determined according to the specific shape and size of the electrode assembly 30. For example, if the electrode assembly 30 is a cylindrical structure, a cylindrical housing can be selected; if the electrode assembly 30 is a cuboid structure, a cuboid housing can be selected.

[0124] Thus, it is convenient to assemble the second housing 10 and the first housing 20, improving the production efficiency.

[0125] In an embodiment of the present application, a plurality of battery cells 105 are arranged in a first direction. The first housing 20 has two first side walls 20A arranged in the first direction, and the second housing 10 has two second side walls 10A arranged in the first direction. A heat insulation member 40 is provided between the first side wall 20A and the second side wall 10A.

[0126] Exemplarily, as Figure 4 shown, the battery cell 105 may be a square shell battery. Along the first direction, the battery cell 105 has a larger side wall (large surface), and the heat insulation member 40 is provided on the inner sides of the two first side walls 20A. It can be understood that when two adjacent battery cells 105 are arranged, they can be arranged with the large surfaces facing each other. In this way, a heat insulation member 40 with a larger area can be provided, thereby achieving a better heat insulation effect.

[0127] Thus, the heat transfer between the battery cells 105 arranged in the first direction can be blocked, the risk of thermal diffusion can be reduced, and the thermal management ability of the battery device 100 can be improved.

[0128] In an embodiment of the present application, as Figure 4 shown, the first housing 20 has two third side walls 20B arranged in a second direction, and the second housing 10 has two fourth side walls 10B arranged in the second direction. A buffer member is provided between the third side wall 20B and the fourth side wall 10B, and the second direction is perpendicular to the first direction.

[0129] Thus, to a certain extent, the anti-vibration and impact resistance ability of the battery cell 105 is enhanced, the influence of vibration and impact on the electrode assembly 30 is reduced, and the stability of the battery cell 105 is improved.

[0130] In an embodiment of the present application, the first housing 20 includes a first end cap 21 and a first housing body 22. One end of the first housing body 22 in a third direction forms a first opening 23, and the first end cap 21 closes the first opening 23; at least one convex portion 21A is provided at the edge of the first end cap 21, and a concave portion 23A corresponding to the convex portion 21A is provided at the edge of the first opening 23, and the convex portion 21A and the concave portion 23A are inserted and matched.

[0131] Exemplarily, as Figure 4 、 Figure 6 shown, the third direction may be the up and down direction, the battery cell 105 is a square shell battery, and the first housing 20 includes a first end cap 21 and a first housing body 22. The insulating layer 60 may be provided on the bottom surface of the first housing body 22.

[0132] In a specific embodiment, the first housing 22 can be made of aluminum. This material not only has good thermal conductivity and mechanical strength but also can effectively protect the internal components. The first end cap 21 can be made of an insulating material (such as plastic, etc.) to ensure electrical isolation and safety. The first end cap 21 can be tightly closed over the first opening 23 by means of insertion. This method is not only easy to install but also provides a reliable sealing effect, preventing external moisture, dust, etc. from entering the battery interior.

[0133] Optionally, a gasket, a sealing ring, etc. can also be provided in the recess 23A to fill the fitting gap and enhance the sealing effect.

[0134] Optionally, the convex portions 21A can also be provided on both sides of the first end cap 21 along the first direction and / or on both sides along the second direction.

[0135] Exemplarily, as Figure 7 shown, the convex portions 21A are provided on both sides of the first end cap 21 along the second direction.

[0136] Optionally, as Figure 8 shown, the surface of the convex portion 21A can form shapes such as hooks, and the recess 23A can have structures that cooperate with the hooks, such as grooves, holes, etc., to enhance the connection effect. The embodiments of the present application do not limit this.

[0137] Thus, the first end cap 21 and the first housing 22 are in an insertion fit. This not only facilitates precise positioning during assembly, improving the assembly efficiency of the battery cell 105, but also enhances the sealing effect of the first housing 22 after assembly, further improving the reliability of the battery cell 105.

[0138] In an embodiment of the present application, along the third direction, the other end of the first housing 22 has a bottom wall 20C, and a thermal conductive adhesive layer 70 is provided on the side of the bottom wall 20C close to the second outer shell 10.

[0139] It can be understood that the thermal conductive adhesive layer 70 can be formed by a thermal conductive adhesive. The thermal conductive adhesive layer 70 can bond and fix the relative positions of the first outer shell 20 and the second outer shell 10, reducing the risk of the second outer shell 10 detaching from the installation position or making abnormal noises.

[0140] Exemplarily, as Figure 4 、 Figure 6 shown, the first housing 22 includes two first side walls 20A, two third side walls 20B, and a bottom wall 20C. The first side walls 20A, the third side walls 20B, and the bottom wall 20C can be formed into an integral structure by methods such as welding, or the first housing 22 can be directly manufactured by means such as stamping and injection molding. The embodiments of the present application do not limit this.

[0141] Exemplarily, the thermal conductive adhesive layer 70 can be formed of thermal conductive silica gel, which has good thermal conductivity and electrical insulation properties, and has good adhesiveness to most metal and non-metal materials. Using thermal conductive silica gel as the adhesive can enable the battery cell 105 to be fully connected to the heat conducting member, so that the heat of the battery cell 105 can be transferred to the heat conducting member to achieve the purpose of heat dissipation. The thermal conductive silica gel can fill some or all of the bonding gaps, thereby further increasing the thermal conductivity.

[0142] In a specific embodiment, as Figure 2 shown, the first housing 22 is in contact with the heat exchange assembly 104 and performs heat exchange. Exemplarily, as Figure 6 shown, the thermal conductive silica gel can be coated on the bottom wall of the first housing 22 to form the thermal conductive adhesive layer 70.

[0143] In a specific embodiment, as Figure 3 shown, the large surface of the battery cell 105 is in contact with the heat exchange assembly 104 and performs heat exchange, and the thermal conductive adhesive layer 70 can be provided inside the large surface of the first housing 22.

[0144] Thus, while fixing the second outer casing 10, the heat conduction efficiency of the battery cell 105 can be improved, and further the heat exchange efficiency of the battery cell 105 can be improved. In addition, the thermal conductive adhesive layer 70 can also disperse heat to avoid the adverse situation of local temperature rise.

[0145] In the embodiment of the present application, the first outer casing 20 includes a first end cap 21 and a first housing 22. The first end cap 21 is a non-metal member, and the first housing 22 is a metal member.

[0146] Optionally, the metal member can be a copper member, a stainless steel member, an aluminum alloy member, etc. The non-metal member can be a plastic member, a glass fiber member, etc.

[0147] Alternatively, the non-metal member can also be a composite member, such as a composite material of glass fiber and plastic. The embodiment of the present application does not limit this.

[0148] Thus, the first end cap can be assembled with the first housing by non-welding means, such as plugging, clamping, bonding, etc., to improve the assembly efficiency of the battery cell.

[0149] In the embodiment of the present application, as Figure 4 、 Figure 5 shown, along the third direction, the second outer casing 10 includes a second end cap 11 and a second housing 12. Along the third direction, the second housing 12 is formed with a second opening 13, and the second end cap 11 closes the second opening 13; along the third direction, the second end cap 11 and the first end cap 21 are located on the same side. The second end cap 11 is provided with an electrode terminal 11A, and the first end cap 21 is provided with an electrode lead hole 21B for leading out the electrode terminal 11A.

[0150] The electrode terminal 11A is used for electrically connecting with the electrode assembly 30 to facilitate outputting the electric energy of the battery cell 105 or inputting the electric energy into the battery cell 105.

[0151] The electrode terminal 11A can be electrically connected with the tab by directly connecting the tab or through an adapter.

[0152] Optionally, the electrode terminal 11A can be made of a single metal material or composed of a combination of multiple metal materials. The metal materials include but are not limited to copper, aluminum, nickel, zinc, iron, etc.

[0153] Optionally, the electrode terminal 11A can be an integrally formed component or composed of multiple parts that are separately formed and then connected to each other.

[0154] The electrode lead-out hole 21B penetrates through the first end cap 21 to facilitate leading out the electric energy in the electrode assembly 30 to the outside of the battery cell 105. Exemplarily, the electrode lead-out hole 21B penetrates through the first end cap 21 along the third direction.

[0155] In a specific embodiment, as Figure 4 、 Figure 5 shown, the electrode terminal 11A is cylindrical, and the electrode lead-out hole 21B is a round hole. The electrode lead-out hole 21B is not only used to fix the electrode terminal 11A but also can define its position. When multiple battery cells 105 are assembled into a group, the requirement for the position accuracy of the electrode terminal 11A can be reduced, the assembly process can be simplified, and the assembly efficiency can be improved.

[0156] Optionally, a sealing structure (such as a sealing ring, sealant, etc.) can be added around the electrode lead-out hole 21B; the sealing performance can be further improved, and the waterproof and dustproof capabilities of the battery cell 105 can be enhanced.

[0157] Optionally, the second end cap 11 can also be provided with an explosion-proof valve, a liquid injection hole, etc., and corresponding through holes are opened in the first end cap 21, such as Figure 5 the through hole for avoiding the explosion-proof valve in, which is not limited in the embodiments of the present application.

[0158] Since the second end cap 11 closes the second opening 13, the sealing effect of the second housing 10 is improved. In addition, since the second end cap 11 and the first end cap 21 are on the same side, it is easier to align and position during the assembly process, and the assembly efficiency is improved. In addition, the first end cap 21 is provided with the electrode lead-out hole 21B for leading out the electrode terminal 11A, so that it is convenient for the battery cell 105 to input and output electric energy.

[0159] In the embodiment of the present application, the thickness of the first housing 22 is less than that of the second housing 12, and the thickness of the first housing 22 is 0.2 - 0.5 mm.

[0160] Optionally, the thickness of the first housing 22 may be 0.20 mm, 0.25 mm, 0.30 mm, 0.35 mm, 0.40 mm, 0.45 mm, 0.50 mm, etc. Other values are not listed in the embodiments of the present application.

[0161] Thus, the thickness of the first housing 22 is within a suitable range, which can reduce the space occupied by the battery cell 105 and its weight to a certain extent, and improve the space utilization rate and energy density of the battery device 100. On the other hand, it also improves the thermal conductivity of the first housing 22 and reduces its influence on heat exchange.

[0162] The second aspect of the embodiments of the present application provides an electrical device. In the embodiments of the present application, the electrical device includes the battery device 100 of the first aspect of the embodiments of the present application, and the battery device 100 is used to store or provide electrical energy.

[0163] Exemplarily, the electrical device may be a vehicle 1000, and the vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. As Figure 1 shown, the battery device 100 is disposed inside the vehicle 1000, and the battery device 100 may be used to supply power to the vehicle 1000. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power requirements of the vehicle 1000 during startup, navigation, and driving.

[0164] Since the electrical device includes the battery device 100 of the first aspect of the embodiments of the present application, the insulation performance and reliability of the electrical device can be improved.

[0165] The specific solutions of the embodiments of the present application will be described below with reference to the accompanying drawings.

[0166] In the current bottom heat exchange project, problems such as particles, electrolyte leakage, and heat exchange medium leakage may cause an equipotential phenomenon between the bottom of the aluminum shell or a large area and the heat exchange component 104, thereby triggering insulation failure. In the large-area heat exchange project, the large-area part of the aluminum shell of the battery cell 105 is also prone to insulation failure with the heat exchange component 104. This double-point insulation failure may cause the battery device 100 to catch fire directly, bringing high risks.

[0167] To solve the problem of double-point insulation failure caused by particles, electrolyte leakage, and heat exchange medium leakage, an embodiment of the present application proposes a battery device 100. The battery device 100 includes a box body 101, a heat exchange component 104, and battery cells 105, where the heat exchange component 104 and the battery cells 105 are both accommodated in the box body 101 and are in contact with each other. The battery cell 105 includes a second outer shell 10, a first outer shell 20, and an electrode assembly 30. The second outer shell 10 is used to accommodate the electrode assembly 30, while the first outer shell 20 has an accommodation space for accommodating the second outer shell 10. There is a certain gap between the first outer shell 20 and the second outer shell 10. The thickness of the first shell 22 is 0.2 to 0.5 millimeters, and the inner surface is coated with an insulating layer 60 to enhance the electrical isolation performance. The gap between the second outer shell 10 and the first outer shell 20 is filled with a heat insulation member 40 or a buffer member 50 (such as MPP) to improve the heat insulation effect and absorb the expansion stress. The bottoms of the two layers of shells are bonded with a thermal conductive adhesive layer 70 to improve the overall heat dissipation effect. A barbed insertion connection is adopted between the first end cap 21 and the first shell 22 to ensure a stable interface. There is no electrical connection between the first outer shell 20 and the second shell 12 and the second end cap 11, thereby providing a reliable insulation barrier between the battery cell 105 and the heat exchange component 104 or other metal components.

[0168] In terms of the intrinsic mechanical strength and expansion cycle performance, the embodiment of the present application reaches the level equivalent to that of a single-layer aluminum shell. Compared with the single-layer aluminum shell, the embodiment of the present application is expected to occupy about 2 millimeters of space in the third direction, but the heat insulation space on the large surface and the side remains unchanged. Through the above design, without affecting the intrinsic mechanical strength and the system expansion cycle performance, the problem of double-point insulation failure of the battery device 100 caused by scenarios such as particle sputtering, electrolyte leakage, and heat exchange medium leakage between the battery cell 105 and the heat exchange component 104 is effectively solved, and the overall reliability of the battery device 100 is improved.

[0169] If there is no special description, all the embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0170] If there is no special description, all the technical features and optional technical features of the present application can be combined with each other to form a new technical solution.

[0171] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope claimed by the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claimed protection.

Claims

1. A battery device, characterized in that, It includes a box body, a heat exchange component and battery cells. The heat exchange component and the battery cells are accommodated in the box body, and the heat exchange component exchanges heat with the battery cells. The battery cell includes a second outer shell, a first outer shell and an electrode assembly. The second outer shell accommodates the electrode assembly. The first outer shell has a first accommodation space, the second outer shell is accommodated in the first accommodation space, and there is a gap between the first outer shell and the second outer shell.

2. The battery device according to claim 1, characterized in that, An insulating layer is provided on a surface of the first outer shell close to the second outer shell.

3. The battery device according to claim 1, characterized in that, In the gap, a heat insulation member and / or a buffer member is provided between the second outer shell and the first outer shell.

4. The battery device according to claim 1, characterized in that, The second outer shell and the first outer shell have the same shape.

5. The battery device according to claim 1, characterized in that, A plurality of the battery cells are arranged in a first direction. The first outer shell has two first side walls arranged along the first direction, and the second outer shell has two second side walls arranged along the first direction. A heat insulation member is provided between the first side wall and the second side wall.

6. The battery device according to claim 5, characterized in that, The first outer shell has two third side walls arranged along a second direction, and the second outer shell has two fourth side walls arranged along the second direction. A buffer member is provided between the third side wall and the fourth side wall. The second direction is perpendicular to the first direction.

7. The battery device according to any one of claims 1 to 6, characterized in that, The first outer shell includes a first end cover and a first housing. One end of the first housing along a third direction forms a first opening, and the first end cover closes the first opening. At least one convex portion is provided at an edge of the first end cover, and a concave portion corresponding to the convex portion is provided at an edge of the first opening. The convex portion and the concave portion are in plug-in fit.

8. The battery device according to claim 7, wherein, Along the third direction, the other end of the first housing has a bottom wall, and a thermally conductive adhesive layer is provided on a side of the bottom wall close to the second outer shell.

9. The battery device according to any one of claims 1 to 6, characterized in that, The first outer shell includes a first end cover and a first housing. The first end cover is a non-metal part, and the first housing is a metal part.

10. The battery device according to claim 7, characterized in that, Along the third direction, the second outer shell includes a second end cover and a second housing. Along the third direction, the second housing forms a second opening, and the second end cover closes the second opening. Along the third direction, the second end cover and the first end cover are on the same side. The second end cover is provided with electrode terminals, and the first end cover is provided with electrode lead holes for leading out the electrode terminals.

11. The battery device according to claim 10, wherein The thickness of the first housing is less than that of the second housing, and the thickness of the first housing is 0.2 - 0.5 mm.

12. An electrical device, characterized in that, It includes the battery device according to any one of claims 1 to 11, and the battery device is used for storing or providing electric energy.

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