Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device.The battery device comprises a plurality of battery monomers, a plurality of confluence pieces and a heat exchange piece, each battery monomer comprises a shell, an electrode assembly and an electrode terminal, at least part of the electrode assembly is contained in the shell, the shell comprises a wall part, and the wall part is located on the side, in the first direction, of the electrode assembly; the electrode terminal is arranged on the wall part and is electrically connected to the electrode assembly; the plurality of confluence pieces are electrically connected with the plurality of battery monomers, and the confluence pieces are connected to the electrode terminals; at least part of the heat exchange piece is located on the side, away from the electrode assembly, of the wall part and used for exchanging heat with the wall part, and the heat exchange piece is connected to the confluence piece and insulated from the confluence piece.

Description

Technical Field

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

[0002] In recent years, battery devices have made great strides and can be widely used in energy storage power systems such as hydropower, thermal power, wind power and solar power plants, as well as in electric vehicles, power tools, military equipment and aerospace.

[0003] Improving the reliability of battery devices is an important research direction in the battery field. Utility Model Content

[0004] This application provides a battery device and an electrical device that can improve the reliability of the battery device.

[0005] In a first aspect, embodiments of this application provide a battery device including a plurality of battery cells, a plurality of busbars, and a heat exchanger. The battery cell includes a housing, an electrode assembly, and an electrode terminal. At least a portion of the electrode assembly is housed in the housing. The housing includes a wall portion located on one side of the electrode assembly along a first direction. The electrode terminal is disposed on the wall portion and electrically connected to the electrode assembly. The plurality of busbars are electrically connected to the plurality of battery cells and are connected to the electrode terminal. At least a portion of the heat exchanger is located on the side of the wall portion away from the electrode assembly and is used for heat exchange with the wall portion. The heat exchanger is connected to the busbars and is insulated from the busbars.

[0006] In the above solution, by at least a portion of the heat exchanger is disposed on the side of the housing wall away from the electrode assembly, and used for heat exchange with the wall, the heat generated by the battery cell during operation can be removed in a timely manner, or the battery cell can be heated in a low-temperature environment, thereby improving the cycle performance of the battery cell. Furthermore, connecting the heat exchanger to the busbar allows the busbar to fix the heat exchanger and the battery cell, improving the structural strength of the heat exchanger and enhancing the reliability and tightness of the connection between the heat exchanger and the battery cell. This improves the heat exchange efficiency between the heat exchanger and the battery cell, thus enhancing the reliability of the battery device. In addition, connecting the heat exchanger to the busbar allows for direct transmission of external loads between the heat exchanger and the busbar, reducing the risk of increased assembly gaps between the heat exchanger and the battery cell wall due to external loads.

[0007] In some embodiments, the battery device includes a plurality of battery cell assemblies arranged along a second direction, the battery cell assembly including a plurality of battery cells arranged along a third direction, the first direction, the second direction and the third direction being perpendicular to each other; along the second direction, a portion of a heat exchanger is located between the electrode terminals of two adjacent battery cell assemblies and exchanges heat with the walls of the battery cells of the two battery cell assemblies.

[0008] In the above scheme, a portion of the heat exchange component is arranged in the space between the electrode terminals of two adjacent battery cell components, which helps to make the structure of the heat exchange component and the battery cell more compact and improves the space utilization rate within the battery device.

[0009] In some embodiments, the heat exchanger includes a first heat exchange plate and a second heat exchange plate. The first heat exchange plate includes a heat exchange portion and a connecting portion. The heat exchange portion and the second heat exchange plate are stacked along a first direction. A flow channel is formed between the heat exchange portion and the second heat exchange plate. The connecting portion connects the heat exchange portion and the manifold.

[0010] In the above scheme, the flow channel is formed by the first heat exchange plate and the second heat exchange plate together, which is beneficial to the production and manufacturing of heat exchange components.

[0011] In some embodiments, the rigidity of the first heat exchange plate is less than that of the second heat exchange plate.

[0012] In the above scheme, setting the rigidity of the first heat exchange plate to be less than that of the second heat exchange plate can, on the one hand, reduce the connection difficulty between the connection part of the first heat exchange plate and the busbar, and on the other hand, help reduce the overall rigidity of the heat exchange component. When there is a height deviation between the walls of the battery cells in adjacent battery cell assemblies in the first direction, the heat exchange component can deform towards the lower wall under the action of the corresponding busbar, making the structure of the heat exchange component and the lower wall more compact, reducing the assembly gap between the heat exchange component and the wall of the battery cell in the first direction, and reducing the risk of a large assembly gap between the heat exchange component and the lower wall affecting the heat exchange effect. The heat exchange component of this application embodiment can simultaneously form a compact structure with the wall of the corresponding battery cell in adjacent battery cell assemblies, which is beneficial to reduce or even eliminate the impact of the height deviation during the battery cell stacking process on the assembly gap between the heat exchange component and the battery cell, increase the contact area between the heat exchange component and the wall of the battery cell, improve the heat exchange efficiency of the heat exchange component and the battery cell, and improve the heat distribution uniformity between the two.

[0013] In some embodiments, the second heat exchange plate is located on the side of the heat exchange section near the wall.

[0014] In the above scheme, the second heat exchange plate has higher rigidity than the first heat exchange plate. Therefore, setting the second heat exchange plate on the side of the heat exchange section facing the wall and using the second heat exchange plate to support the first heat exchange plate is beneficial to improving the reliability of the connection between the connection part of the first heat exchange plate and the busbar. It is also beneficial to improve the heat exchange component's resistance to the expansion force generated by the battery cell during the cycle, reduce the risk of the flow channel being squeezed and deformed, maintain close contact between the heat exchange component and the wall of the battery cell, and improve the heat exchange efficiency between the heat exchange component and the battery cell.

[0015] In some embodiments, the thermal conductivity of the second heat exchange plate is higher than that of the first heat exchange plate, which is beneficial to improving the heat exchange efficiency between the heat exchange element and the wall of the battery cell.

[0016] In some embodiments, the heat exchange section is provided with connecting portions on both sides along the second direction, and the second direction is perpendicular to the first direction.

[0017] In the above solution, the heat exchange section is connected to the busbars of adjacent battery cells via connecting parts on both sides. This helps to further improve the reliability and tightness of the connection between the heat exchange section and the battery cells, and improve the heat exchange efficiency between the heat exchange section and the battery cells. Furthermore, the heat exchange section also transmits external loads to the busbars of adjacent battery cells, further reducing the risk of increased assembly gaps between the heat exchange section and the battery cell walls due to external loads.

[0018] In some embodiments, the connecting portion includes two first limiting portions and a second limiting portion. The second limiting portion connects the two first limiting portions, and the two first limiting portions clamp the two sides of the busbar to engage with the busbar, thereby reducing the difficulty of connecting the heat exchanger and the busbar.

[0019] In some embodiments, the first limiting portion includes a limiting body and a protrusion. The limiting bodies of the two first limiting portions are located on both sides of the busbar, and the protrusion protrudes from the limiting body on the side near the busbar. Along the first direction, the protrusion abuts against the side of the busbar near the battery cell.

[0020] In the above solution, the first limiting part includes a limiting body and a protrusion. The limiting bodies of the two first limiting parts are clamped on both sides of the busbar, and the protrusions of the two first limiting parts press against the side of the busbar closer to the battery cell along a first direction to restrict the movement of the connecting part relative to the busbar in a direction away from the battery cell. This reduces the risk of accidental separation between the connecting part and the busbar, and improves the reliability of the connection between the connecting part and the busbar. Furthermore, since the first heat exchange plate has low rigidity, it reduces the difficulty of snapping the connecting part and the busbar together, and also helps to reduce the risk of local stress concentration between the connecting part and the busbar, reducing the possibility of cracks in the connecting part and the busbar, and extending the service life.

[0021] In some embodiments, along a first direction, the second limiting portion presses against the side of the busbar away from the battery cell.

[0022] In the above solution, the second limiting part can be used to restrict the movement of the connecting part relative to the busbar in the direction close to the battery cell, further reducing the risk of the connecting part and the busbar separating due to accident.

[0023] In some embodiments, the connecting portion is bonded to the manifold to reduce the difficulty of connecting the heat exchanger and the manifold. When the connecting portion includes two first limiting portions and a second limiting portion, the connecting portion can be further bonded to the manifold while being engaged with it by the two first limiting portions and the second limiting portion, so as to further fix the heat exchanger and the manifold, and at the same time improve the structural durability of the heat exchanger.

[0024] In some embodiments, the battery device further includes a thermally conductive adhesive component, through which the heat exchange component is connected to the wall to further secure the heat exchange component, improve stability during the heat exchange process between the heat exchange component and the battery cell, and enhance the heat exchange effect. Simultaneously, the thermally conductive adhesive component has good thermal conductivity, which is beneficial for improving the heat exchange efficiency between the heat exchange component and the battery cell. Furthermore, since the heat exchange component is connected to the busbar, the busbar's limiting effect on the heat exchange component allows for shaping of the thermally conductive adhesive component, reducing the size of the assembly gap between the heat exchange component and the wall, as well as the thickness of the thermally conductive adhesive component. This improves the bonding reliability of the thermally conductive adhesive component to the heat exchange component and the wall, enhances the heat exchange efficiency and heat distribution uniformity between the heat exchange component and the battery cell, and reduces the risk of localized overheating between the heat exchange component and the battery cell.

[0025] In some embodiments, the thickness of the thermally conductive adhesive is 0.2mm-0.8mm along the first direction. On the one hand, this can improve the bonding reliability of the thermally conductive adhesive to the heat exchanger and the wall. On the other hand, it can also help reduce the impact of the thermally conductive adhesive on the heat exchange effect between the heat exchanger and the battery cell, thereby improving the heat exchange efficiency and heat distribution uniformity between the heat exchanger and the battery cell.

[0026] Secondly, embodiments of this application provide an electrical device, including any of the battery devices described above.

[0027] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application 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 these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0030] Figure 2Exploded views of battery devices according to some embodiments of this application;

[0031] Figure 3 This is an exploded structural diagram of a battery cell according to some embodiments of this application;

[0032] Figure 4 This is a partial top view of a battery device according to some embodiments of this application;

[0033] Figure 5 yes Figure 4 Schematic diagram of the cross section at point AA;

[0034] Figure 6 yes Figure 5 A magnified view of section BB in the middle.

[0035] The attached icons are numbered as follows:

[0036] Vehicle 1000; Battery unit 100; Controller 200; Motor 300;

[0037] Box body 10; first part 101; second part 102; battery cell assembly 50; battery cell 20; electrode assembly 21; outer shell 22; end cap 221; housing 222; wall 223; electrode terminal 23; busbar 30; heat exchanger 40; first heat exchange plate 41; heat exchange part 411; connecting part 412; first limiting part 4121; second limiting part 4122; limiting body 4123; protrusion 4124; flow channel 413; second heat exchange plate 42; thermally conductive adhesive 60; first direction Z; second direction X; third direction Y. Detailed Implementation

[0038] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0039] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0040] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0041] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0042] In this application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, cuboid / square battery cells, and pouch battery cells, and the embodiments of this application are not limited thereto.

[0043] In this embodiment of the application, the battery cell can be a secondary battery cell, which refers to a battery cell that can be used again after being discharged by recharging to activate the active materials.

[0044] The battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., but this application does not limit it to this type.

[0045] A single battery cell typically includes an electrode assembly. The electrode assembly consists of a positive electrode and a negative electrode. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes.

[0046] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0047] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0048] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0049] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0050] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0051] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0052] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0053] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0054] In some implementations, the electrode assembly is a stacked structure.

[0055] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0056] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0057] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0058] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0059] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0060] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0061] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0062] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0063] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0064] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte may include an electrolyte salt and a solvent.

[0065] In some embodiments, the electrolyte may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high-temperature performance of the battery cell, and additives that improve the low-temperature performance of the battery cell.

[0066] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via busbars.

[0067] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0068] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0069] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0070] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0071] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0072] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0073] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0074] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0075] Battery devices include heat exchangers to regulate the temperature of individual battery cells, ensuring they operate within a suitable temperature range. These heat exchangers typically contain a flowing heat exchange medium that exchanges heat with the individual battery cells to regulate their temperature. However, current systems suffer from low reliability in the connection between the heat exchangers and the battery cells, which can negatively impact heat exchange efficiency and consequently, the reliability of the entire battery device.

[0076] Based on the above considerations, this application provides a battery device including multiple battery cells, multiple busbars, and a heat exchanger. Each battery cell includes a housing, an electrode assembly, and electrode terminals. At least a portion of the electrode assembly is housed within the housing. The housing includes a wall located on one side of the electrode assembly along a first direction. The electrode terminals are disposed on the wall and electrically connected to the electrode assembly. Multiple busbars are electrically connected to the multiple battery cells and are connected to the electrode terminals. At least a portion of the heat exchanger is located on the side of the wall away from the electrode assembly and is used for heat exchange with the wall. The heat exchanger is connected to and insulated from the busbars. The busbars indirectly connect the heat exchanger and the battery cells, which improves the reliability and tightness of the connection between the heat exchanger and the battery cells, increases the heat exchange efficiency between the heat exchanger and the battery cells, and thus improves the reliability of the battery device.

[0077] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0078] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 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.

[0079] 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.

[0080] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device provided in some embodiments of this application. The battery device 100 includes a housing 10 and a battery cell 20. In some embodiments, the housing 10 may include a first portion 101 and a second portion 102, which overlap each other, and together define a receiving cavity for accommodating the battery cell 20. The second portion 102 may be a hollow structure open at one end, and the first portion 101 may be a plate-like structure, with the first portion 101 covering the open side of the second portion 102 so that the first portion 101 and the second portion 102 together define the receiving cavity; the first portion 101 and the second portion 102 may also be hollow structures both open on one side, with the open side of the first portion 101 covering the open side of the second portion 102. Either the first portion 101 and the second portion 102 may include a base plate, and at least one of the first portion 101 and the second portion 102 may include a frame. Of course, the battery box formed by the first part 101 and the second part 102 can be of various shapes, such as cylinder, cuboid, etc.

[0081] In the battery device 100, there can be multiple battery cells 20. These multiple battery cells 20 can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed configuration together, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also be composed of multiple battery cells 20 first connected in series, in parallel, or in a mixed configuration to form battery modules, and then multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10.

[0082] Each battery cell 20 can be a secondary battery cell or a primary battery cell; it can also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0083] Figure 3 This is an exploded structural diagram of the battery cell 20 according to some embodiments of this application. For example... Figure 3 As shown, the battery cell 20 includes an electrode assembly 21 and a housing 22. The housing 22 includes an end cap 221 and a casing 222. The casing 222 has an opening, and the end cap 221 is a component that closes onto the opening of the casing 222 to isolate the internal environment of the battery cell 20 from the external environment. The casing 222 may have one or more openings. The end cap 221 may also be provided in one or more ways.

[0084] Regardless of the specific type, the shape of the end cap 221 can be adapted to the shape of the housing 222 to fit the housing 222. Optionally, the end cap 221 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 221 is not easily deformed when subjected to compression and impact, so that the battery cell 20 can have higher structural strength and the safety performance can also be improved.

[0085] The end cap 221 may be provided with functional components such as electrode terminals 23. The electrode terminals 23 can be used to electrically connect with the electrode assembly 21 to output or input electrical energy to the battery cell 20. The electrode terminals 23 can be directly connected to the tab or indirectly connected to the tab through a current collector. The electrode terminals 23 can be provided on the end cap 221 or on the housing 222.

[0086] In some embodiments, the end cap 221 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The end cap 221 can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0087] In some embodiments, an insulating element may be provided on the inner side of the end cap 221. The insulating element can be used to isolate the electrical connection components within the housing 222 from the end cap 221 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0088] Figure 3 This is an exploded structural diagram of a battery cell according to some embodiments of this application. Figure 4 This is a partial top view of a battery device according to some embodiments of this application. Figure 5 yes Figure 4 A cross-sectional schematic diagram at point AA, wherein...Figure 5 The electrode assembly of the battery cell is not shown.

[0089] Please see Figures 3-5 In a first aspect, embodiments of this application provide a battery device 100, including a plurality of battery cells 20, a plurality of busbars 30, and a heat exchanger 40. The battery cell 20 includes a housing 22, an electrode assembly 21, and an electrode terminal 23. At least a portion of the electrode assembly 21 is housed in the housing 22. The housing 22 includes a wall 223 located on one side of the electrode assembly 21 along a first direction Z. The electrode terminal 23 is disposed on the wall 223 and electrically connected to the electrode assembly 21. The plurality of busbars 30 are electrically connected to the plurality of battery cells 20 and are connected to the electrode terminal 23. At least a portion of the heat exchanger 40 is located on the side of the wall 223 away from the electrode assembly 21 and is used for heat exchange with the wall 223. The heat exchanger 40 is connected to the busbars 30 and is insulated from the busbars 30.

[0090] The battery cell 20 is the basic unit for storing and releasing electrical energy in the battery device 100. There are various ways to arrange multiple battery cells 20. For example, multiple battery cells 20 can be arranged in the same direction, or multiple battery cells 20 can be arranged in different directions.

[0091] In the housing 22, the wall portion 223 may be at least a portion of the end cap 221, or it may be part of the housing 222. The wall portion 223 and the electrode assembly 21 are arranged along a first direction Z. When the wall portion 223 is at least a portion of the end cap 221 or a portion of the housing 222 opposite to the end cap 221, the first direction Z may be the height direction of the battery cell 20; when the wall portion 223 is a portion of the housing 222 adjacent to the end cap 221, the first direction Z may be the width direction or the thickness direction of the battery cell 20.

[0092] Electrode terminals 23 are disposed on the wall portion 223. Optionally, electrode terminals 23 may penetrate the wall portion 223 along a first direction Z. A portion of electrode terminals 23 may be exposed inside the housing 22 for electrical connection with the electrode assembly 21, while another portion may be exposed outside the housing 22 for input or output current. Busbars 30 are connected to the electrode terminals 23 for electrical connection with the battery cells 20. Multiple busbars 30 can be used to achieve series, parallel, or mixed connection of multiple battery cells 20.

[0093] At least a portion of the heat exchanger 40 is located on the side of the wall 223 away from the electrode assembly 21, and it can exchange heat with the corresponding wall 223 on the side of the corresponding electrode terminal 23. There can be one or more heat exchangers 40. At least one side of the heat exchanger 40 may have an electrode terminal 23, while the opposite side may not have an electrode terminal 23; or, at least one side of the heat exchanger 40 may have electrode terminals 23 on both opposite sides. All of the heat exchanger 40 may be located on the side of the corresponding electrode terminal 23 and exchange heat with the wall 223, in which case the side of the heat exchanger 40 may be connected to the side of the busbar 30; or, a portion of the heat exchanger 40 may be located on the side of the corresponding electrode terminal 23 and exchange heat with the wall 223, while the remaining portion may be located in other directions of the busbar 30 and connected to the busbar 30.

[0094] The heat exchanger 40 is connected to the busbar 30 to indirectly fix it to the battery cell 20 via the busbar 30. There are various ways to connect the heat exchanger 40 and the busbar 30; for example, the heat exchanger 40 can be snapped or glued to the busbar 30. The heat exchanger 40 is insulated from the busbar 30 to reduce the risk of short circuits within the battery device 100. There are various ways to insulate the heat exchanger 40 from the busbar 30; for example, the heat exchanger 40 may include insulating material, and at least a portion of the heat exchanger 40 may be an insulating element, thereby achieving insulation while connected to the busbar 30; alternatively, an insulating layer may be provided between the heat exchanger 40 and the busbar 30 to achieve insulation isolation between them.

[0095] In the above solution, by disposing at least a portion of the heat exchanger 40 on the side of the wall 223 of the housing 22 away from the electrode assembly 21, and using it to exchange heat with the wall 223, the heat generated by the battery cell 20 during operation can be removed in a timely manner, or the battery cell 20 can be heated in a low-temperature environment, thereby improving the cycle performance of the battery cell 20. Furthermore, by connecting the heat exchanger 40 to the busbar 30, the busbar 30 can be used to fix the heat exchanger 40 and the battery cell 20, improving the structural strength of the heat exchanger 40, enhancing the reliability and tightness of the connection between the heat exchanger 40 and the battery cell 20, and thus improving the heat exchange efficiency between the heat exchanger 40 and the battery cell 20, thereby improving the reliability of the battery device 100.

[0096] In addition, by connecting the heat exchanger 40 to the busbar 30, external loads can be directly transferred between the heat exchanger 40 and the busbar 30, which helps to reduce the risk of increased assembly gap between the heat exchanger 40 and the wall 223 of the battery cell 20 due to the action of external loads.

[0097] Please continue reading. Figure 4 and Figure 5In some embodiments, the battery device 100 includes a plurality of battery cell assemblies 50 arranged along a second direction X. Each battery cell assembly 50 includes a plurality of battery cells 20 arranged along a third direction Y. The first direction Z, the second direction X, and the third direction Y are perpendicular to each other. Along the second direction X, a portion of a heat exchanger 40 is located between the electrode terminals 23 of two adjacent battery cell assemblies 50 and exchanges heat with the walls 223 of the battery cells 20 of the two battery cell assemblies 50.

[0098] Multiple battery cell modules 50 are arranged along a second direction X, and within each battery cell module 50, multiple battery cells 20 are arranged along a third direction Y. The first direction Z, the second direction X, and the third direction Y can be three mutually perpendicular directions. For example, the first direction Z can be the height direction of the battery cell 20, the second direction X can be either the width direction or the thickness direction of the battery cell 20, and the third direction Y can be the other.

[0099] A portion of the heat exchanger 40 is located between the electrode terminals 23 of two adjacent battery cell assemblies 50. The heat exchanger 40 can extend in the third direction Y and can exchange heat with the walls 223 of multiple battery cells 20 in the two adjacent battery cell assemblies 50. Utilizing the space between the electrode terminals 23 of two adjacent battery cell assemblies 50 to arrange a portion of the heat exchanger 40 helps to make the structure of the heat exchanger 40 and the battery cells 20 more compact, thereby improving the space utilization within the battery device 100.

[0100] The number of heat exchangers 40 can be one or more. In one example, there are two battery cell assemblies 50, and the number of heat exchangers 40 can be one, with a portion of the heat exchanger 40 located between the electrode terminals 23 of the two battery cell assemblies 50. In another example, there are three or more battery cell assemblies 50, and the number of heat exchangers 40 can be two or more, with a portion of the heat exchanger 40 located between the electrode terminals 23 of any two adjacent battery cell assemblies 50.

[0101] Please see Figure 5 In some embodiments, the heat exchanger 40 includes a first heat exchange plate 41 and a second heat exchange plate 42. The first heat exchange plate 41 includes a heat exchange portion 411 and a connecting portion 412. The heat exchange portion 411 and the second heat exchange plate 42 are stacked along a first direction Z. A flow channel 413 is formed between the heat exchange portion 411 and the second heat exchange plate 42. The connecting portion 412 connects the heat exchange portion 411 and the manifold 30.

[0102] In the heat exchanger 40, the first heat exchange plate 41 and the second heat exchange plate 42 are used together to form a flow channel 413, which is beneficial to the production and manufacturing of the heat exchanger 40. The first heat exchange plate 41 includes a heat exchange portion 411 and a connecting portion 412. The heat exchange portion 411 and the connecting portion 412 can be integrally formed or separately formed. At least one of the heat exchange portion 411 and the second heat exchange plate 42 can be provided with a groove. When the heat exchange portion 411 and the second heat exchange plate 42 are stacked along the first direction Z, the heat exchange portion 411 and the second heat exchange plate 42 can be enclosed at the groove to form a flow channel 413 for the flow of heat exchange medium.

[0103] The heat exchange section 411 can be located on the side of the wall 223 away from the electrode assembly 21, and is located to the side of the corresponding electrode terminal 23. The electrode terminal 23 can be provided on one side of the heat exchange section 411, and a connecting portion 412 is provided on one side of the heat exchange section 411. This connecting portion 412 is fixedly connected to the busbar 30 connected to the corresponding electrode terminal 23. Alternatively, electrode terminals 23 can be provided on both sides of the heat exchange section 411. In this case, connecting portions 412 are provided on both sides of the heat exchange section 411, and the connecting portions 412 on both sides can be fixedly connected to the busbar 30 connected to the electrode terminals 23 on both sides respectively. The second heat exchange plate 42 can be located on the side of the first heat exchange plate 41 facing the wall 223, or the second heat exchange plate 42 can be located on the side of the first heat exchange plate 41 away from the wall 223.

[0104] In some embodiments, the rigidity of the first heat exchange plate 41 is less than that of the second heat exchange plate 42.

[0105] The first heat exchange plate 41 may be a structure that can deform under external force. For example, the first heat exchange plate 41 may include composite flexible materials such as carbon fiber reinforced resin and glass fiber epoxy resin, or the first heat exchange plate 41 may also include other easily deformable metal materials.

[0106] In the above scheme, the rigidity of the first heat exchange plate 41 is set to be less than that of the second heat exchange plate 42. On the one hand, this can reduce the connection difficulty between the connecting part 412 of the first heat exchange plate 41 and the busbar 30. On the other hand, it can also help reduce the overall rigidity of the heat exchange component 40. When the wall 223 of the battery cell 20 in the adjacent battery cell assembly 50 has a height deviation in the first direction Z, the heat exchange component 40 can deform towards the lower wall 223 under the action of the corresponding busbar 30. This makes the structure of the heat exchange component 40 and the lower wall 223 more compact, reduces the assembly gap between the heat exchange component 40 and the wall 223 of the battery cell 20 in the first direction Z, and reduces the risk of a large assembly gap between the heat exchange component 40 and the lower wall 223 affecting the heat exchange effect. The heat exchanger 40 in this embodiment can simultaneously form a tight structure with the wall 223 of the corresponding battery cell 20 in the adjacent battery cell assembly 50. This helps to reduce or even eliminate the influence of the height deviation during the stacking process of the battery cells 20 on the assembly gap between the heat exchanger 40 and the battery cells 20, increase the contact area between the heat exchanger 40 and the wall 223 of the battery cells 20, and improve the heat exchange efficiency and heat distribution uniformity between the heat exchanger 40 and the battery cells 20.

[0107] For example, the plurality of battery cell assemblies 50 include adjacent first battery cell assembly 50 and second battery cell assembly 50. In the first direction Z, when the surface of the wall portion 223 of the battery cell 20 in the first battery cell assembly 50 away from the electrode assembly 21 is higher than the wall portion 223 of the battery cell 20 in the second battery cell assembly 50, under the action of the busbar 30 corresponding to the second battery cell assembly 50, a portion of the heat exchange member 40 can deform in the direction close to the wall portion 223 of the battery cell 20 in the second battery cell assembly 50, so that the heat exchange member 40 forms a tight structure with both the wall portion 223 of the battery cell 20 in the first battery cell assembly 50 and the wall portion 223 of the battery cell 20 in the second battery cell assembly 50, thereby improving the heat exchange efficiency of the heat exchange member 40 with both the battery cell 20 in the first battery cell assembly 50 and the battery cell 20 in the second battery cell assembly 50.

[0108] Optionally, the bending strength of the first heat exchange plate 41 is greater than or equal to 150 MPa, which helps to reduce the risk of cracking in the first heat exchange plate 41 and improve the service life of the first heat exchange plate 41.

[0109] Please continue reading. Figure 5 In some embodiments, the second heat exchange plate 42 is located on the side of the heat exchange section 411 near the wall section 223.

[0110] The second heat exchange plate 42 has higher rigidity than the first heat exchange plate 41. Therefore, by placing the second heat exchange plate 42 on the side of the heat exchange section 411 facing the wall 223 and using the second heat exchange plate 42 to support the first heat exchange plate 41, it is beneficial to improve the reliability of the connection between the connecting part 412 of the first heat exchange plate 41 and the busbar 30. It is also beneficial to improve the resistance of the heat exchange section 40 to the expansion force generated by the battery cell 20 during the cycle, reduce the risk of the flow channel 413 being squeezed and deformed, maintain the close contact between the heat exchange section 40 and the wall 223 of the battery cell 20, and improve the heat exchange efficiency between the heat exchange section 40 and the battery cell 20.

[0111] In some embodiments, the thermal conductivity of the second heat exchange plate 42 is higher than that of the first heat exchange plate 41, which is beneficial to improving the heat exchange efficiency between the heat exchange element 40 and the wall 223 of the battery cell 20.

[0112] Please continue reading. Figure 5 In some embodiments, the heat exchange section 411 is provided with connecting sections 412 on both sides along the second direction X, and the second direction X is perpendicular to the first direction Z.

[0113] In the above scheme, the heat exchange section 411 is connected to the busbar 30 connected to the battery cells 20 of the adjacent battery cell assembly 50 via the connecting sections 412 on both sides. This helps to further improve the reliability and tightness of the connection between the heat exchange section 40 and the battery cells 20, and improve the heat exchange efficiency between the heat exchange section 40 and the battery cells 20. Furthermore, the heat exchange section 40 also transmits external loads to the busbar 30 connected to the battery cells 20 of the adjacent battery cell assembly 50, further reducing the risk of increased assembly gap between the heat exchange section 40 and the wall 223 of the battery cells 20 due to external loads.

[0114] Please see Figure 6 In some embodiments, the connecting part 412 includes two first limiting parts 4121 and a second limiting part 4122. The second limiting part 4122 connects the two first limiting parts 4121. The two first limiting parts 4121 are clamped on both sides of the busbar 30 to engage with the busbar 30, thereby reducing the difficulty of connecting the heat exchanger 40 and the busbar 30.

[0115] It should be noted that when the two first limiting portions 4121 are clamped on both sides of the busbar 30, all of the first limiting portions 4121 may be located on the side of the busbar 30, or a portion of the first limiting portions 4121 may be located on the side of the busbar 30, while the remaining portion may be located at other positions on the busbar 30. At least a portion of the second limiting portion 4122 is located between the two first limiting portions 4121 to connect the two first limiting portions 4121. At least a portion of the second limiting portion 4122 may be located on the side of the busbar 30, or the second limiting portion 4122 may be located on the side of the busbar 30 away from the battery cell 20 along the first direction Z.

[0116] Optionally, multiple battery cell assemblies 50 are arranged along the second direction X, and a portion of the heat exchanger 40 is located between the electrode terminals 23 of two adjacent battery cell assemblies 50. In this case, the two first limiting portions 4121 can be clamped on both sides of the busbar 30 along the second direction X.

[0117] Please continue reading. Figure 6 In some embodiments, the first limiting part 4121 includes a limiting body 4123 and a protrusion 4124. The limiting bodies 4123 of the two first limiting parts 4121 are located on both sides of the busbar 30, and the protrusion 4124 protrudes from the limiting body 4123 on the side near the busbar 30. Along the first direction Z, the protrusion 4124 presses against the side of the busbar 30 near the battery cell 20.

[0118] The limiting bodies 4123 of the two first limiting portions 4121 are arranged at a distance from each other and are clamped on both sides of the busbar 30, that is, the busbar 30 is located between the limiting bodies 4123 of the two first limiting portions 4121, and the second limiting portion 4122 connects the two limiting bodies 4123. Along the arrangement direction of the limiting bodies 4123 of the two first limiting portions 4121, a portion of the busbar 30 may protrude from the electrode terminal 23.

[0119] The protrusion 4124 is located on the side of the limiting body 4123 near the busbar 30, protruding from the surface of the limiting body 4123 near the busbar 30. Along the first direction Z, the protrusion 4124 may be located at one end of the limiting body 4123 near the battery cell 20, and the protrusion 4124 may press against the surface of the busbar 30 facing the battery cell 20 relative to the portion protruding from the electrode terminal 23. The limiting body 4123 and the protrusion 4124 may be integrally formed. The shape of the protrusion 4124 may be various, for example, the protrusion 4124 may be hook-shaped.

[0120] In the above solution, the first limiting part 4121 includes a limiting body 4123 and a protrusion 4124. The limiting bodies 4123 of the two first limiting parts 4121 are clamped on both sides of the busbar 30. Furthermore, the protrusions 4124 of the two first limiting parts 4121 press against the side of the busbar 30 near the battery cell 20 along the first direction Z, thereby restricting the movement of the connecting part 412 relative to the busbar 30 in a direction away from the battery cell 20. This reduces the risk of accidental separation between the connecting part 412 and the busbar 30, and improves the reliability of the connection between the connecting part 412 and the busbar 30. Moreover, since the first heat exchange plate 41 has low rigidity, the difficulty of engaging the connecting part 412 and the busbar 30 can be reduced, and the risk of local stress concentration between the connecting part 412 and the busbar 30 can also be reduced, decreasing the possibility of cracks in the connecting part 412 and the busbar 30, and extending their service life.

[0121] Please continue reading. Figure 6 In some embodiments, along the first direction Z, the second limiting portion 4122 presses against the side of the busbar 30 away from the battery cell 20.

[0122] Specifically, along the first direction Z, a portion of the protrusion 4124 and a portion of the second limiting portion 4122 are arranged at a distance from each other, and a portion of the busbar 30 is clamped between the protrusion 4124 and the second limiting portion 4122 along the first direction Z.

[0123] In the above solution, the second limiting part 4122 can be used to restrict the movement of the connecting part 412 relative to the busbar 30 in the direction close to the battery cell 20, further reducing the risk of the connecting part 412 and the busbar 30 separating due to accident.

[0124] Optionally, along the first direction Z, the distance between the protrusion 4124 and the second limiting part 4122 can be 0.3mm-0.5mm. For example, the distance can be 0.3mm, 0.32mm, 0.35mm, 0.4mm, 0.44mm, 0.47mm, 0.5mm or any other value between the two aforementioned values, in order to adapt to the thickness of the busbar 30 and reduce the assembly gap and fit tolerance between the connecting part 412 and the busbar 30.

[0125] In some embodiments, the connecting portion 412 is bonded to the manifold 30 to reduce the difficulty of connecting the heat exchanger 40 and the manifold 30.

[0126] Specifically, an adhesive may be provided between the connecting portion 412 and the busbar 30 to bond the connecting portion 412 and the busbar 30. The connecting portion 412 may be bonded to the busbar 30 from the side away from the battery cell 20 along the first direction Z; or, the connecting portion 412 may include two first limiting portions 4121 and a second limiting portion 4122, so that while being engaged with the busbar 30 by the two first limiting portions 4121 and the second limiting portion 4122, at least one of the first limiting portions 4121 and the second limiting portion 4122 is bonded to the busbar 30 to further fix the heat exchanger 40 and the busbar 30, while improving the structural durability of the heat exchanger 40.

[0127] Please see Figure 6 In some embodiments, the battery device 100 further includes a thermally conductive adhesive 60, through which the heat exchanger 40 is connected to the wall portion 223 to further fix the heat exchanger 40, improve the stability of the heat exchanger 40 and the battery cell 20 during the heat exchange process, and enhance the heat exchange effect. At the same time, the thermally conductive adhesive 60 has good thermal conductivity, which is beneficial to improving the heat exchange efficiency between the heat exchanger 40 and the battery cell 20.

[0128] In this embodiment, the heat exchanger 40 is connected to the busbar 30. The busbar 30 limits the heat exchanger 40, which can shape the thermally conductive adhesive 60 to reduce the size of the assembly gap between the heat exchanger 40 and the wall 223, as well as the thickness of the thermally conductive adhesive 60. This improves the bonding reliability of the thermally conductive adhesive 60 to the heat exchanger 40 and the wall 223, enhances the heat exchange efficiency and heat distribution uniformity between the heat exchanger 40 and the battery cell 20, and reduces the risk of local overheating between the heat exchanger 40 and the battery cell 20.

[0129] See Figure 6 In some embodiments, the thickness H of the thermally conductive adhesive 60 along the first direction Z is 0.2mm-0.8mm. On the one hand, this can improve the bonding reliability of the thermally conductive adhesive 60 to the heat exchanger 40 and the wall 223. On the other hand, it can also help reduce the impact of the thermally conductive adhesive 60 on the heat exchange effect between the heat exchanger 40 and the battery cell 20, thereby improving the heat exchange efficiency and heat distribution uniformity between the heat exchanger 40 and the battery cell 20.

[0130] As an example, the thickness H of the thermally conductive adhesive 60 can be 0.2 mm, 0.25 mm, 0.3 mm, 0.4 mm, 0.55 mm, 0.6 mm, 0.75 mm, 0.8 mm, or any other value between any two of the aforementioned values.

[0131] This application provides a battery device 100, including a plurality of battery cells 20, a plurality of busbars 30, and a heat exchanger 40. The battery cell 20 includes a housing 22, an electrode assembly 21, and an electrode terminal 23. At least a portion of the electrode assembly 21 is housed in the housing 22. The housing 22 includes a wall 223 located on one side of the electrode assembly 21 along a first direction Z. The electrode terminal 23 is disposed on the wall 223 and electrically connected to the electrode assembly 21. The plurality of busbars 30 are electrically connected to the plurality of battery cells 20 and are connected to the electrode terminal 23. At least a portion of the heat exchanger 40 is located on the side of the wall 223 away from the electrode assembly 21 and is used for heat exchange with the wall 223. The heat exchanger 40 is connected to the busbars 30 and is insulated from the busbars 30. The battery device 100 includes a plurality of battery cell assemblies 50 arranged along a second direction X. Each battery cell assembly 50 includes a plurality of battery cells 20 arranged along a third direction Y. The first direction Z, the second direction X, and the third direction Y are perpendicular to each other. Along the second direction X, a portion of a heat exchanger 40 is located between the electrode terminals 23 of two adjacent battery cell assemblies 50 and exchanges heat with the walls 223 of the battery cells 20 of the two battery cell assemblies 50. The heat exchanger 40 includes a first heat exchange plate 41 and a second heat exchange plate 42. The first heat exchange plate 41 includes a heat exchange portion 411 and a connecting portion 412. The heat exchange portion 411 and the second heat exchange plate 42 are stacked along the first direction Z, and a flow channel 413 is formed between the heat exchange portion 411 and the second heat exchange plate 42. The connecting portion 412 connects the heat exchange portion 411 and the manifold 30. The rigidity of the first heat exchange plate 41 is less than that of the second heat exchange plate 42. The connecting portion 412 includes two first limiting portions 4121 and a second limiting portion 4122. The second limiting portion 4122 connects the two first limiting portions 4121, and the two first limiting portions 4121 are clamped on both sides of the busbar 30. The first limiting portion 4121 includes a limiting body 4123 and a protrusion 4124. The limiting body 4123 of the two first limiting portions 4121 is located on both sides of the busbar 30, and the protrusion 4124 protrudes from the limiting body 4123 on the side near the busbar 30. Along the first direction Z, the protrusion 4124 abuts against the side of the busbar 30 near the battery cell 20.

[0132] Secondly, embodiments of this application provide an electrical device including the battery device 100 described above.

[0133] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Multiple battery cells, each battery cell including a housing, an electrode assembly and electrode terminals, at least a portion of the electrode assembly being housed in the housing, the housing including a wall portion located on one side of the electrode assembly along a first direction, and the electrode terminals being disposed on the wall portion and electrically connected to the electrode assembly; Multiple busbars are electrically connected to the multiple battery cells, and the busbars are connected to the electrode terminals; A heat exchanger, at least a portion of which is located on the side of the wall away from the electrode assembly and is used for heat exchange with the wall, the heat exchanger being connected to and insulated from the busbar; The heat exchanger includes a first heat exchange plate and a second heat exchange plate. The first heat exchange plate includes a heat exchange portion and a connecting portion. The heat exchange portion and the second heat exchange plate are stacked along the first direction, and a flow channel is formed between the heat exchange portion and the second heat exchange plate. The connecting portion connects the heat exchange portion and the manifold. The connecting portion includes two first limiting portions and a second limiting portion. The second limiting portion connects to the two first limiting portions, and the two first limiting portions are clamped on both sides of the manifold.

2. The battery device according to claim 1, characterized in that, The battery device includes a plurality of battery cell assemblies arranged along a second direction, and each battery cell assembly includes a plurality of battery cells arranged along a third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other. Along the second direction, a portion of the heat exchanger is located between the electrode terminals of two adjacent battery cell assemblies and exchanges heat with the walls of the battery cells of the two battery cell assemblies.

3. The battery device according to claim 1, characterized in that, The rigidity of the first heat exchange plate is less than that of the second heat exchange plate.

4. The battery device according to claim 3, characterized in that, The second heat exchange plate is located on the side of the heat exchange section near the wall.

5. The battery device according to claim 4, characterized in that, The thermal conductivity of the second heat exchange plate is higher than that of the first heat exchange plate.

6. The battery device according to claim 1, characterized in that, The heat exchange section is provided with the connecting section on both sides along the second direction, and the second direction is perpendicular to the first direction.

7. The battery device according to claim 6, characterized in that, The first limiting part includes a limiting body and a protrusion. The limiting bodies of the two first limiting parts are located on both sides of the busbar. The protrusion protrudes from the limiting body on the side near the busbar. Along the first direction, the protrusion abuts against the side of the busbar near the battery cell.

8. The battery device according to claim 6, characterized in that, Along the first direction, the second limiting portion presses against the side of the busbar that is away from the battery cell.

9. The battery device according to claim 1, characterized in that, The connecting part is bonded to the busbar.

10. The battery device according to any one of claims 1-9, characterized in that, The battery device further includes a thermally conductive adhesive, through which the heat exchange component is connected to the wall portion.

11. The battery device according to claim 10, characterized in that, Along the first direction, the thickness of the thermally conductive adhesive is 0.2mm-0.8mm.

12. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 1-11.

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