Battery device and electric equipment

Abstract

The utility model discloses a battery device and electric equipment, and relates to the technical field of batteries, the battery device comprises a box body, a plurality of battery monomers and a heat exchange plate; the plurality of battery monomers are arranged in the box body, each battery monomer comprises a shell and an end cover, the end cover covers the shell along a first direction, an electrode terminal is arranged on the end cover, and the electrode terminals in two adjacent battery monomers are electrically connected through a confluence component; the heat exchange plate is arranged in the box body and located on one side, in the first direction, of the single batteries, the heat exchange plate is provided with a contact part, the contact part abuts against the confluence component, and the contact part is made of an insulating heat conduction material. According to the technical scheme provided by the invention, the heat exchange plate is arranged on the side, where the confluence component is located, of the battery monomer, and the confluence component can be cooled through the heat exchange plate, so that heat transfer between two adjacent battery monomers through the confluence component is limited, and the problem that thermal runaway of the battery monomers in an existing battery device is easy to diffuse is solved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery device and an electrical equipment. Background Art

[0002] Considering the production difficulty and high voltage requirements, the battery device of new energy vehicles is usually composed of multiple battery cells combined in series and parallel. However, after a certain battery cell in the current battery device undergoes thermal runaway, it is easy to cause adjacent battery cells to also undergo thermal runaway, resulting in the spread of thermal runaway. Summary of the Utility Model

[0003] The main purpose of this application is to propose a battery device and an electrical equipment, aiming to improve the problem that thermal runaway of battery cells in the current battery device is prone to spread.

[0004] In a first aspect, the battery device proposed in this application includes:

[0005] A box body;

[0006] Multiple battery cells, arranged in the box body. The battery cells include a housing and an end cover. The end cover covers the housing along a first direction, and electrode terminals are arranged on the end cover. The electrode terminals in two adjacent battery cells are electrically connected through a busbar component; and,

[0007] A heat exchange plate, arranged in the box body and on one side of the battery cells along the first direction. The heat exchange plate has a main body part and a contact part. The contact part is connected to the main body part and together defines a heat exchange cavity. The contact part abuts against the busbar component, wherein the material of the contact part is an insulating and heat-conducting material.

[0008] In the technical solution provided by the present application, two adjacent battery cells are electrically connected through a busbar component. By arranging a heat exchange plate in contact with the busbar component, heat exchange can be achieved therewith. When one of the battery cells, as a heat source, undergoes a thermal runaway, the heat generated by it can be fully absorbed by the heat exchange plate during the process of being transferred to the adjacent battery cell through the busbar component, reducing the probability that the separator in the adjacent battery cell shrinks due to heat absorption. The corresponding electrode assembly is not likely to short-circuit abnormally to form a new heat source, that is, it hinders the spread of thermal runaway of the battery cell within the battery device. Moreover, since the heat exchange plate exchanges heat with the busbar component through its contact portion, and the material of the contact portion is set as an insulating and heat-conducting material, the contact portion can ensure the high-voltage insulation performance between the heat exchange plate and the busbar component while achieving heat transfer. The connection between the contact portion and the main body portion means that the material of the main body portion can be different from that of the contact portion, that is, the main body portion does not need to consider the insulation performance and can focus on the selection of high-performance heat-conducting materials, thereby increasing the upper limit of the heat exchange efficiency of the heat exchange plate.

[0009] In one embodiment, the insulating and heat-conducting material is polycarbonate, or polyphenylene sulfide, or epoxy resin.

[0010] In the above technical solution, polycarbonate, polyphenylene sulfide, and epoxy resin have good insulation performance and relatively high melting points. Based on this, when the contact portion made of the insulating and heat-conducting material exchanges heat with the busbar component, it is not easy to melt after absorbing a relatively high temperature, and the structural stability of the heat exchange plate at high temperatures is relatively high.

[0011] In one embodiment, the energy density of the battery cell is less than or equal to 390 Wh / L, and the melting point of the insulating and heat-conducting material is greater than or equal to 200 °C and less than or equal to 250 °C; or,

[0012] The energy density of the battery cell is greater than 390 Wh / L, and the melting point of the insulating and heat-conducting material is greater than 250 °C.

[0013] In the above technical solution, matching the melting point of the insulating and heat-conducting material with the energy density of the battery cell is beneficial to selecting a suitable insulating and heat-conducting material according to the corresponding type of battery cell, while ensuring that the contact portion has sufficient high-temperature stability and is also beneficial to controlling the production cost of the contact portion according to actual needs.

[0014] In one embodiment, the material of the main body portion is a metal heat-conducting material.

[0015] In the above technical solution, the material of the main body part is selected as a metal heat-conducting material. While ensuring that the main body part has sufficient mechanical strength, the metal heat-conducting material generally has better heat-conducting performance than non-metal materials, which helps to improve the heat exchange efficiency of the heat exchange plate.

[0016] In one embodiment, the contact part and the main body part are joined by a hot pressing process or an injection molding process.

[0017] In the above technical solution, through the hot pressing process or the injection molding process, the two local structures with different materials of the main body part and the contact part can be spliced into one body, and sufficient contact can be formed between the two, ensuring the sealing performance while also ensuring the heat transfer efficiency between the two.

[0018] In one embodiment, the heat exchange plate includes a cover plate and a bottom plate, and the cover plate and the bottom plate are arranged in mutual contact along the first direction;

[0019] The bottom plate includes a base part and the contact part, and the base part is connected to the contact part;

[0020] Among them, the main body part includes the base part and the cover plate.

[0021] Compared with the existing method of forming a cavity by casting or machining, in the above technical solution, the heat exchange plate is arranged to be formed by the mutual contact of the cover plate and the bottom plate, so as to form a heat exchange cavity between the two, which can reduce the forming difficulty of the heat exchange cavity. Moreover, the bottom plate is arranged to be formed by connecting the base part and the contact part, which can reduce the difficulty of arranging the contact part on the main body part.

[0022] In one embodiment, the heat exchange cavity at least partially overlaps with the current collecting component in the first direction.

[0023] In the above technical solution, arranging the heat exchange cavity to overlap with the current collecting component in the first direction is beneficial for the heat on the current collecting component to directly reach the heat exchange cavity through the contact part and be absorbed by the phase change heat exchange medium filled therein, improving the heat exchange efficiency of the heat exchange plate.

[0024] In one embodiment, the heat exchange cavity includes a heat exchange flow channel for flowing heat exchange fluid.

[0025] In the above technical solution, at least part of the heat exchange cavity is set as a heat exchange flow channel. By introducing heat exchange fluid into the heat exchange flow channel, the heat from the current collecting component can be continuously absorbed, which helps to further delay the spread of thermal runaway.

[0026] In one embodiment, the heat exchange cavity includes a sealed cavity filled with a phase change heat exchange medium.

[0027] In the above technical solution, at least part of the heat exchange cavity is set as a sealed cavity, and a phase change heat exchange medium is arranged in the sealed cavity. On the basis of meeting the heat exchange performance of the heat exchange plate, the relevance between the heat exchange plate and the surrounding structures can be reduced (for example, the sealed cavity does not need to be externally connected to a heat exchange pipeline), and the installation difficulty of the heat exchange plate can be reduced.

[0028] In one embodiment, the heat exchange plate has a first region and a second region adjacent to each other. A heat exchange flow channel is formed in the first region, and the sealed cavity is formed in the second region;

[0029] The heat exchange cavity includes the heat exchange flow channel.

[0030] In the above technical solution, the heat exchange plate has a first region and a second region adjacent to each other. By arranging a heat exchange flow channel in the first region, the heat exchange fluid in the heat exchange flow channel can take away and dissipate the heat of the heat exchange plate. By arranging a sealed cavity in the second region and filling it with a phase change heat exchange medium, the heat absorption capacity of the heat exchange plate can be improved, so that the heat exchange plate forms a composite heat exchange structure, making full use of the internal space of the heat exchange plate and further improving the heat exchange performance of the heat exchange plate.

[0031] In one embodiment, a heat-conducting colloid is arranged between the contact part and the current collecting component, and the thickness of the heat-conducting colloid in the first direction is between 1 mm and 2 mm.

[0032] In the above technical solution, through the arrangement of the heat-conducting colloid, the tiny gap between the contact part and the current collecting component can be filled, so as to form a continuous heat transfer path and improve the heat transfer efficiency between the current collecting component and the contact part. Since the heat-conducting colloid has certain adhesiveness and buffering properties, setting the thickness of the heat-conducting colloid in the first direction between 1 mm and 2 mm can absorb the vibration or impact between the heat exchange plate and the current collecting component, and will not excessively occupy the space inside the box body in the first direction, and control the heat conduction resistance existing in the heat-conducting colloid itself.

[0033] In one embodiment, the end cover has a third region and a fourth region distributed in the second direction. The third region is recessed into the shell inward compared with the fourth region, and the first direction intersects with the second direction;

[0034] The electrode terminal is arranged in the third region.

[0035] In the above technical solution, setting the third region of the end cover to be recessed into the shell inward compared with the fourth region and arranging the electrode terminal in the third region is beneficial to arranging the electrode terminal closer to the internal electrode assembly, compressing the void space inside the shell, thereby improving the space utilization rate inside the battery cell and increasing its energy density.

[0036] In one embodiment, a first buffer portion is provided between the heat exchange plate and the inner wall of the box body.

[0037] In the above technical solution, through the arrangement of the first buffer portion, a buffering effect can be achieved between the heat exchange plate and the inner wall of the box body, improving the overall structural stability of the box body and the heat exchange plate.

[0038] In one embodiment, the distance between the heat exchange plate and the inner wall of the box body in the first direction is between 2 mm and 10 mm;

[0039] Wherein, the first buffer portion is arranged under pressure.

[0040] In the above technical solution, the distance between the heat exchange plate and the inner wall of the box body is controlled between 2 mm and 10 mm, and the first buffer portion is arranged in a compressed state therebetween, ensuring that the first buffer portion can provide sufficient buffering and supporting effects while also reducing the excessive occupation of the box body space by the first buffer portion.

[0041] In one embodiment, a second buffer portion is further provided between the heat exchange plate and the battery cell.

[0042] In the above technical solution, a second buffer portion is provided between the heat exchange plate and the battery cell. Through the second buffer portion, the impact or gravity of the heat exchange plate can be transmitted to the housing or end cap of the battery cell, increasing the force application points between the heat exchange plate and the battery cell other than the electrode terminals, and preventing the electrode terminals from being damaged due to excessive pressure.

[0043] In one embodiment, at least a part of the second buffer portion overlaps with the housing in the first direction.

[0044] In the above technical solution, since the housing of the battery cell has a continuous solid structure in the first direction, the second buffer portion is arranged to at least partially overlap with the housing in the first direction, and the second buffer portion can transmit the acting force of the heat exchange plate to the housing of the battery cell, thereby reducing the force on the end cap and improving the deformation of the end cap due to force.

[0045] In one embodiment, a plurality of the battery cells are stacked along a third direction, and the third direction intersects with the first direction;

[0046] Two end plates are provided in the box body, and the two end plates are respectively arranged on both sides of the plurality of battery cells along the third direction;

[0047] The heat exchange plate is installed on the two end plates.

[0048] In the above technical solution, through the arrangement of the end plate, it is possible to tightly limit the battery cells stacked along the third direction, thereby resisting the expansion and deformation of the battery cells during the charge and discharge process. Using the end plate to provide an installation foundation for the heat exchange plate can increase the structural compactness of the end plate, the battery cells and the heat exchange plate, thereby improving the utilization rate of the internal space of the battery device and being beneficial to improving the energy density of the battery device.

[0049] In a second aspect, the present application also provides an electrical device, which includes the above battery device. Description of the Drawings

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0051] Figure 1 It is a schematic structural diagram of an embodiment where the electrical device provided by the present application is a vehicle;

[0052] Figure 2 It is an exploded structural schematic diagram of an embodiment of the battery device provided by the present application;

[0053] Figure 3 It is an exploded structural schematic diagram of an embodiment of the heat exchange plate in the battery device provided by the present application;

[0054] Figure 4 For Figure 3 It is a cross-sectional structural schematic diagram of the heat exchange plate in

[0055] Figure 5 For Figure 4 It is an enlarged structural schematic diagram of the local part A in

[0056] Figure 6 It is a structural schematic diagram of the battery cell and the busbar component in the battery device provided by the present application.

[0057] Explanation of the Reference Numerals in the Drawings:

[0058] 1000, vehicle;

[0059] 100, battery device; 200, controller; 300, motor;

[0060] 1. Heat exchange plate; 1a. Main body; 1b. Contact part; 1c. First region; 1d. Second region; 1e. Heat exchange cavity; 11e. Heat exchange flow channel; 12e. Sealing cavity; 11. Cover plate; 12. Bottom plate; 121. Base part; 13. Phase change heat transfer medium; 2. Box body; 21. Box main body; 22. Box cover; 3. Battery cell; 31. Shell; 32. End cover; 32a. Third region; 32b. Fourth region; 321. Electrode terminal; 4. First buffer part; 5. Bus bar component

[0061] X. First direction; Y. Second direction; Z. Third direction

[0062] The realization of the purpose of this application, functional features and advantages will be further described with reference to the embodiments and the accompanying drawings Specific embodiments

[0063] The embodiments of the technical solutions of this 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 this application more clearly, so they are only examples and cannot be used to limit the protection scope of this application

[0064] 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 the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion

[0065] In the description of the embodiments of this application, technical terms such as "first" and "second" 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 this application, "a plurality of" means more than two, unless otherwise specifically defined

[0066] 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 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 explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments

[0067] In the description of the embodiments of this application, the term "a plurality of" means more than two (including two). Similarly, "a plurality of groups" means more than two groups (including two groups), and "a plurality of sheets" means more than two sheets (including two sheets)

[0068] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the embodiments of the present application.

[0069] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside 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 specific situations.

[0070] Considering that the production of a single large battery cell is difficult, it is difficult to meet the high-voltage requirements, and it is difficult to control after thermal runaway and difficult to adapt to the chassis space of new energy vehicles, the battery devices of existing new energy vehicles are usually composed of multiple smaller battery cells combined in series and parallel. However, in the current battery device, after a certain battery cell undergoes thermal runaway, it is easy to cause adjacent battery cells to also undergo thermal runaway, resulting in the spread of thermal runaway.

[0071] Analysis shows that the electrode terminals (also called pole columns) of adjacent battery cells are usually electrically connected through a busbar component. When one battery cell undergoes thermal runaway, it will generate a lot of heat, that is, a heat source is formed. A considerable part of these heats will reach the busbar component through the electrode terminals, and then reach the electrode terminals of another battery cell through the busbar component, resulting in the heat shrinkage of the separator in the battery cell, and then causing a short circuit between the positive and negative plates of the corresponding electrode assembly, and finally forming a new heat source. This process repeats, resulting in the spread of the thermal runaway phenomenon of battery cells in the battery device.

[0072] Based on the above analysis, it can be considered to perform heat dissipation treatment on the busbar component to prevent heat from being transferred between the electrode terminals of adjacent two battery cells, that is, to improve the problem that the thermal runaway of battery cells in the current battery device is easy to spread.

[0073] The battery device disclosed in the embodiments of the present application can be used to provide electrical energy for electrical equipment. Among them, the electrical equipment can be, but is not limited to, battery cars, electric vehicles, ships, spacecraft, and so on. Among them, spacecraft can include airplanes, rockets, space shuttles, and spaceships, and so on.

[0074] For the convenience of description in the following embodiments, a vehicle is taken as an example of an electrical equipment in an embodiment of the present application for illustration.

[0075] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of an embodiment in which the electrical equipment provided by the present application is a vehicle. 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. A battery device 100 is disposed inside the vehicle 1000. The battery device 100 can be disposed at the bottom, the head, or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 may further 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, navigation, and driving of the vehicle 1000.

[0076] In some embodiments of the present application, the battery device 100 can not only be used as the operating power source of the vehicle 1000, but also be used 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.

[0077] For ease of understanding the battery device provided by the present application, please refer to Figure 2 , Figure 2 which is an exploded structural schematic diagram of an embodiment of the battery device provided by the present application. The battery device 100 generally includes a box body 2 and battery cells 3. An installation cavity is formed inside the box body 2, and the battery cells 3 are loaded through the installation cavity. The basic structure of the box body 2 generally includes a box main body 21 and a box cover 22. The box cover 22 is disposed on the box main body 21 and jointly defines the installation cavity with the box main body 21. Generally speaking, the battery cells 3 are generally disposed in the box main body 21. After the battery device 100 is mounted on the vehicle, the box cover 22 is generally close to the vehicle, and the box main body 21 is generally away from the vehicle; the installation cavity can be mainly formed in the box main body 21. At this time, the box main body 21 can be understood as a basin-like structure, and the box cover 22 is covered on the box main body 21 to cover the installation cavity; the installation cavity can also be mainly formed in the box cover 22. At this time, the box cover 22 can be understood as a cover-like structure, and the box cover 22 covers the box main body 21 to cover the battery cells 3 carried on the box main body 21 into the box cover 22. Of course, the structure of the box body 2 is not limited to this.

[0078] The number of battery cells 3 in the box body 2 can be one or multiple. When multiple battery cells 3 are provided, the multiple battery cells 3 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that there are both series and parallel connections among the multiple battery cells 3. The multiple battery cells 3 can be directly connected in series, in parallel, or in a hybrid connection to form a battery assembly. Of course, the multiple battery cells 3 can also be in the form that the battery cells 3 are first connected in series, in parallel, or in a hybrid connection to form battery modules, and then the multiple battery modules are connected in series, in parallel, or in a hybrid connection to form a battery assembly. The battery device 100 can also include other structures, such as a busbar component, which is used to realize the electrical connection between the multiple battery cells 3 or the multiple battery modules. Each battery cell 3 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 3 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0079] The structure of the battery cell 3 generally includes a housing, an electrode assembly, and an electrode terminal. An accommodation cavity is usually formed inside the housing. The electrode assembly is installed in the accommodation cavity and is led out to the outside of the housing through the electrode terminal provided on the housing wall to be connected to the busbar component of the battery device. According to the different structural types of the battery cell 3, the specific type of the "housing" is generally divided into a square housing and a cylindrical housing. The housing generally includes a shell body and an end cover. The end cover is covered on the shell body to enclose the accommodation cavity with the shell body. The electrode terminal is usually provided on the end cover so that after the electrode assembly is integrally connected to the end cover, it can be inserted into the shell body. The "electrode assembly" is usually composed of a positive electrode plate, a negative electrode plate, and a separator. Among them, the lithium-ion electrode assembly mainly works by the reciprocating deintercalation and intercalation of lithium ions between the positive electrode plate and the negative electrode plate.

[0080] To improve the above-mentioned technical problems, in the battery device provided in the present application, in addition to the box body 2 and the battery cells 3, a heat exchange plate is further included. To facilitate the understanding of the heat exchange plate provided in the present application and its connection method, the following will be described with reference to the accompanying drawings. Among them, Figure 3 is an exploded structural schematic diagram of an embodiment of the heat exchange plate in the battery device provided in the present application; Figure 4 is Figure 3 the cross-sectional structural schematic diagram of the heat exchange plate; Figure 5 is Figure 4 the enlarged structural schematic diagram of the partial area A; Figure 6 is the structural schematic diagram of the battery cell and the busbar component in the battery device provided in the present application.

[0081] Please combine Figure 2 and refer to Figure 3, in an embodiment of the present application, the battery device 100 includes a box body 2, a plurality of battery cells 3 and a heat exchange plate 1; the plurality of battery cells 3 are arranged in the box body 2, the battery cell 3 includes a housing 31 and an end cover 32, the end cover 32 is covered on the housing 31 along the first direction X, and an electrode terminal 321 is arranged on the end cover 32, and the electrode terminals 321 in two adjacent battery cells 3 are electrically connected through a bus bar component 5; the heat exchange plate 1 is arranged in the box body 2 and is on one side of the battery cell 3 along the first direction X, the heat exchange plate 1 has a contact portion 1b, and the contact portion 1b abuts against the bus bar component 5, wherein the material of the contact portion 1b is an insulating and heat-conducting material.

[0082] It should be noted that the first direction X mentioned in the embodiments of the present application and the second direction Y and the third direction Z mentioned in the following embodiments are relative to the battery device 100 itself, and have no necessary association with the setting direction of the overall structure of the battery device 100.

[0083] The "housing 31" usually forms a receiving cavity, the end cover 32 is covered on the housing 31 along the first direction X, which can also be understood as the receiving cavity opening along the first direction X, and the end cover 32 covers the opening of the receiving cavity. Based on the fact that the electrode terminal 321 is located on the end cover 32 and the heat exchange plate 1 is on one side of the battery cell 3 along the first direction X, that is, the heat exchange plate 1 and the bus bar component 5 are on the same side of the battery cell 3.

[0084] The "heat exchange plate 1" refers to a structure that can perform heat exchange with the bus bar component 5. Its heat exchange function includes absorbing heat from the bus bar component 5 to cool it down and conducting heat to the bus bar component 5 to heat it up. In the former function, the heat exchange plate 1 can be made of a material with a better heat conduction efficiency than the bus bar component 5, so that the heat on the bus bar component 5 is preferentially transferred to the heat exchange plate 1. It is worth mentioning that the purpose of the present application is to prevent the spread of thermal runaway between adjacent battery cells. Therefore, the heat exchange plate 1 may only cool down the bus bar component 5 for a period of time, and stop heat exchange after the heat absorbed by the heat exchange plate 1 is saturated or the temperature of the heat exchange plate 1 rises to the same as that of the bus bar component 5; in the latter function, the heat exchange plate 1 can also conduct heat to the bus bar component 5 to heat it up when necessary, for example, when the temperature of the battery cell 3 is relatively low, so as to quickly raise the battery cell 3 to the efficient temperature range.

[0085] "The heat exchange plate 1 has a contact portion 1b, and the contact portion 1b abuts against the bus bar component 5" means that the heat exchange plate 1 abuts against the bus bar component 5 through the contact portion 1b, that is, the part of the heat exchange plate 1 in contact with the bus bar component 5 is defined as the contact portion 1b; the "insulating and heat-conducting material" refers to a material with insulating and heat-conducting properties, and there are many materials that meet these requirements, and this embodiment does not limit this.

[0086] Multiple battery cells 3 have multiple electrode terminals 321, and electrical connection also needs to be achieved through multiple busbar components 5. In the embodiment of the present application, the heat exchange plate 1 abuts at least against some of the busbar components 5 through its contact portion 1b, and the spread of thermal runaway can be restricted by the heat exchange effect of the heat exchange plate 1 at least in a local area.

[0087] In the technical solution provided by the present application, two adjacent battery cells 3 are electrically connected through the busbar component 5. By arranging the heat exchange plate 1 to abut against the busbar component 5, heat exchange can be carried out therewith. When one of the battery cells 3 has a thermal runaway as a heat source, the heat generated by it can be fully absorbed by the heat exchange plate 1 during the process of being transferred to the adjacent battery cell 3 through the busbar component 5, reducing the probability that the separator in the adjacent battery cell 3 shrinks due to heat absorption. The corresponding electrode assembly is not likely to have a short - circuit abnormality to form a new heat source, that is, the thermal runaway of the battery cell 3 is hindered from spreading in the battery device 100. Moreover, since the heat exchange plate 1 abuts against the busbar component 5 through its contact portion 1b for heat exchange, and the material of the contact portion 1b is set as an insulating and heat - conducting material, the contact portion 1b can ensure the high - voltage insulation performance between the heat exchange plate 1 and the busbar component 5 while realizing heat transfer.

[0088] In one embodiment, the insulating and heat - conducting material is polycarbonate, or polyphenylene sulfide, or epoxy resin.

[0089] It should be noted that "polycarbonate, polyphenylene sulfide, epoxy resin" all have good insulation performance and also have good heat - conducting performance.

[0090] In the above - mentioned technical solution, polycarbonate, polyphenylene sulfide, and epoxy resin have high melting points while having good insulation performance. Based on this, when the contact portion 1b made of the insulating and heat - conducting material exchanges heat with the busbar component 5, it is not easy to melt after absorbing a high temperature, and the structural stability of the heat exchange plate 1 at high temperatures is relatively high.

[0091] In one embodiment, the energy density of the battery cell 3 is less than or equal to 390 Wh / L, and the melting point of the insulating and heat - conducting material is greater than or equal to 200 °C and less than or equal to 250 °C.

[0092] Among them, "the melting point of the insulating and heat - conducting material is greater than or equal to 200 °C and less than or equal to 250 °C" means that the melting point of the insulating and heat - conducting material can take any value between 200 °C and 250 °C. For example, the melting point of the insulating and heat - conducting material can be 200 °C, 235 °C, 250 °C. Generally speaking, on the premise of not melting itself, the higher the melting point of the material, the higher the reliability of the material.

[0093] In one embodiment, the energy density of the battery cell 3 is greater than 390 Wh / L, and the melting point of the insulating and heat-conducting material is greater than 250 °C.

[0094] Among them, "the melting point of the insulating and heat-conducting material is greater than 250 °C" means that the melting point of the insulating and heat-conducting material can take any value above 250 °C. For example, the melting point of the insulating and heat-conducting material can be 251 °C, 260 °C, 290 °C. Generally speaking, the higher the melting point of the material, the higher the reliability of the material.

[0095] It should be noted that in this embodiment, the unit of "the energy density of the battery cell 3" is watt-hour per liter (Wh / L), which refers to the electric energy that the battery cell 3 can store per unit volume. This energy density is an important indicator to measure the compactness of the battery cell 3. Generally speaking, the magnitude of the energy density of the battery cell 3 is closely related to the amount of heat that can be released after the battery cell 3 undergoes thermal runaway, that is, it is closely related to the temperature of the busbar component 5.

[0096] In the above technical solution, matching the melting point of the insulating and heat-conducting material with the energy density of the battery cell 3 is beneficial to selecting a suitable insulating and heat-conducting material according to the corresponding model of the battery cell 3. While ensuring that the contact portion 1b has sufficient high-temperature stability, it is also beneficial to control the production cost of the contact portion 1b according to actual requirements.

[0097] Please refer to Figures 3 to 5 , in one embodiment, the heat exchange plate 1 further includes a main body portion 1a. The contact portion 1b is connected to the main body portion 1a, and together they define a heat exchange cavity 1e, and the heat exchange cavity 1e is used to fill a phase change heat transfer medium 13.

[0098] It should be noted that the "main body portion 1a" belongs to the main structure of the heat exchange plate 1 except for the contact portion 1b. Generally, it can be considered that there is no direct contact between the main body portion 1a and the busbar component 5; "the contact portion 1b is connected to the main body portion 1a", and there are various connection methods. For example, it can be bonded with structural adhesive. Since the contact portion 1b and the main body portion 1a together define the heat exchange cavity 1e, the connection between the contact portion 1b and the main body portion 1a needs to meet sufficient sealing requirements; the "phase change heat transfer medium 13" refers to a medium that uses the absorption or release of a large amount of latent heat during the phase change process of a substance to carry out heat transfer and heat storage. Common phase change heat transfer media 13 include hydrated salts, molten salts, metals and metal alloys, paraffin, water, etc. The specific composition of the phase change heat transfer medium 13 is not limited in this embodiment.

[0099] In the above technical solution, the contact part 1b is connected to the main body part 1a, which means that the main body part 1a can be made of a different material from the contact part 1b. That is, the main body part 1a does not need to consider insulation performance and can focus on the selection of high-performance heat-conducting materials, thereby increasing the upper limit of the heat exchange efficiency of the heat exchange plate 1; by filling the phase change heat exchange medium 13 in the heat exchange cavity 1e, a large amount of heat can be exchanged with the contact part 1b by virtue of the heat exchange and phase change characteristics of the phase change heat exchange medium 13, further delaying the spread of thermal runaway.

[0100] In one embodiment, the material of the main body part 1a is a metal heat-conducting material.

[0101] It should be noted that there are various "metal heat-conducting materials". For example, copper, aluminum, silver, etc. The specific composition of the metal heat-conducting material in this embodiment is not limited. However, it is worth mentioning that metal heat-conducting materials generally have good heat-conducting performance and certain mechanical strength.

[0102] In the above technical solution, the material of the main body part 1a is selected as a metal heat-conducting material. While ensuring that the main body part 1a has sufficient mechanical strength, the metal heat-conducting material generally has better heat-conducting performance than non-metal materials, which helps to improve the heat exchange efficiency of the heat exchange plate 1.

[0103] In one embodiment, the contact part 1b and the main body part 1a are joined by a hot pressing process or an injection molding process.

[0104] It should be noted that the "hot pressing process" is a manufacturing process that tightly combines materials by heating or pressurizing; the "injection molding process" refers to a process of injecting molten plastic material into a mold and forming the required shape or structure after cooling. In this embodiment, the material of the contact part 1b is an insulating and heat-conducting material, and a corresponding plastic material can be specifically selected, so that the contact part 1b can be processed on the main body part 1a through the injection molding process.

[0105] In the above technical solution, through the hot pressing process or the injection molding process, the two locally different structures of the main body part 1a and the contact part 1b can be spliced into one body, and sufficient contact can be formed between the two, ensuring both the sealing performance and the heat transfer efficiency between the two.

[0106] Please refer to Figures 3 to 5 , in one embodiment, the heat exchange plate 1 includes a cover plate 11 and a bottom plate 12, and the cover plate 11 and the bottom plate 12 are arranged in mutual contact along the first direction X; the bottom plate 12 includes a base part 121 and a contact part 1b, and the base part 121 is connected to the contact part 1b; wherein, the main body part 1a includes the base part 121 and the cover plate 11.

[0107] It should be noted that "the cover plate 11 and the bottom plate 12 are arranged in mutual contact along the first direction X" can be realized by bonding with structural adhesive or by brazing. Regarding the processing method of brazing, this embodiment will not elaborate on it; after the fitting is completed, a heat exchange cavity 1e can be defined between the cover plate 11 and the bottom plate 12. For example, a process groove is formed in the area of the cover plate 11 corresponding to the contact part 1b of the bottom plate 12, and the contact part 1b covers the notch of the process groove, thus forming the heat exchange cavity 1e. In this embodiment, the heat exchange plate 1 is divided into the cover plate 11 and the bottom plate 12 according to the processing technology, and the base parts 121 of the cover plate 11 and the bottom plate 12 can be combined to form the main body part 1a after the fitting is completed.

[0108] Compared with the existing method of forming a cavity by casting or machining, in the above technical solution, the heat exchange plate 1 is arranged to be formed by the mutual fitting of the cover plate 11 and the bottom plate 12, so as to form the heat exchange cavity 1e therebetween, which can reduce the forming difficulty of the heat exchange cavity 1e. Moreover, the bottom plate 12 is arranged to be integrally connected by the base part 121 and the contact part 1b, which can reduce the difficulty of arranging the contact part 1b on the main body part 1a.

[0109] Please refer to Figure 2 , in an embodiment, the heat exchange cavity 1e at least partially overlaps with the current collecting component 5 in the first direction X.

[0110] It should be noted that "the heat exchange cavity 1e at least partially overlaps with the current collecting component 5 in the first direction X" includes that in the projection in the first direction X, the heat exchange cavity 1e completely covers the current collecting component 5, or the heat exchange cavity 1e partially overlaps with the current collecting component 5. Based on the above setting, the heat of the current collecting component 5 can be directly introduced into the heat exchange cavity 1e along the first direction X.

[0111] In the above technical solution, the heat exchange cavity 1e is arranged to overlap with the current collecting component 5 in the first direction X, which is beneficial to the heat on the current collecting component 5 reaching the heat exchange cavity 1e directly through the contact part 1b and being absorbed by the phase change heat transfer medium 13 filled therein, thus improving the heat exchange efficiency of the heat exchange plate 1.

[0112] Please refer to Figure 4 and Figure 5 , in an embodiment, the heat exchange cavity 1e includes a heat exchange flow channel 11e for flowing a heat exchange fluid.

[0113] It should be noted that "the heat exchange chamber 1e includes the heat exchange flow path 11e" can be understood as that the heat exchange chamber 1e is solely composed of the heat exchange flow path 11e, or it can also be understood that in addition to the heat exchange flow path 11e, the heat exchange chamber 1e further includes other chambers or channels; "the heat exchange flow path 11e is used for circulating the heat exchange fluid" means that the heat exchange flow path 11e also needs to be connected to an external heat exchange pipeline so as to circulate and introduce the heat exchange fluid, and the heat exchange fluid can be water, mineral oil, heat-conducting oil, etc.

[0114] In the above technical solution, at least a part of the heat exchange chamber 1e is set as the heat exchange flow path 11e. By introducing the heat exchange fluid into the heat exchange flow path 11e, the heat from the confluence component 5 can be continuously absorbed, which helps to further delay the spread of thermal runaway.

[0115] Please refer to Figure 4 and Figure 5 In an embodiment, the heat exchange chamber 1e includes a sealed chamber 12e, and a phase change heat exchange medium 13 is filled in the sealed chamber 12e.

[0116] It should be noted that "the heat exchange chamber 1e includes the sealed chamber 12e" can be understood as that the heat exchange chamber 1e is solely composed of the sealed chamber 12e, or it can also be understood that in addition to the sealed chamber 12e, the heat exchange chamber 1e further includes other chambers or channels; "the sealed chamber 12e" can generally be understood as a chamber inside the solid structure of the heat exchange plate 1 and isolated from the external environment of the heat exchange plate 1. "A phase change heat exchange medium 13 is filled in the sealed chamber 12e" means that the phase change heat exchange medium 13 is in contact with all the inner wall surfaces of the sealed chamber 12e.

[0117] In the above technical solution, at least a part of the heat exchange chamber 1e is set as the sealed chamber 12e, and a phase change heat exchange medium 13 is arranged in the sealed chamber 12e. On the basis of meeting the heat exchange performance of the heat exchange plate 1, the correlation between the heat exchange plate 1 and the surrounding structures can be reduced (for example, the sealed chamber 12e does not need to be externally connected to a heat exchange pipeline), and the installation difficulty of the heat exchange plate 1 can be reduced.

[0118] Please refer to Figure 4 and Figure 5 In an embodiment, the heat exchange plate 1 has a first region 1c and a second region 1d adjacent to each other. A heat exchange flow path 11e is formed in the first region 1c, and the sealed chamber 12e is formed in the second region 1d; the heat exchange chamber 1e includes the heat exchange flow path 11e.

[0119] It should be noted that the "first region 1c" and the "second region 1d" can be understood as physical structures on the heat exchange plate 1 observable in the first direction X; there can be only one first region 1c and second region 1d on the heat exchange plate 1, or there can be multiple, for example, multiple first regions 1c and multiple second regions 1d can be sequentially spaced in the second direction Y, that is, there is one second region 1d between two first regions 1c, or there is one first region 1c between two second regions 1d; the heat exchange plate 1 as a whole belongs to a plate-like structure, so it has a certain extended plane, and the first region 1c and the second region 1d are adjacently arranged in this extended plane.

[0120] In the above technical solution, the heat exchange plate 1 has an adjacently arranged first region 1c and second region 1d. By arranging a heat exchange flow channel 11e in the first region 1c, the heat exchange fluid in the heat exchange flow channel 11e can take away and dissipate the heat of the heat exchange plate 1. By arranging a sealed cavity 12e in the second region 1d and filling it with a phase change heat exchange medium 13, the heat absorption capacity of the heat exchange plate 1 can be improved, so that the heat exchange plate 1 forms a composite heat exchange structure, making full use of the internal space of the heat exchange plate 1 and further improving the heat exchange performance of the heat exchange plate 1.

[0121] In one embodiment, a heat conductive colloid is provided between the contact part 1b and the current collecting component 5, and the thickness of the heat conductive colloid along the first direction X is between 1 mm and 2 mm.

[0122] It should be noted that the "heat conductive colloid" is usually a colloid structure with good heat conduction performance and adhesion performance. For example, the heat conductive colloid can be a heat conductive gel, a heat conductive silicone grease or a heat conductive silicone rubber. The material of the heat conductive colloid is not limited in this embodiment; "the thickness of the heat conductive colloid along the first direction X is between 1 mm and 2 mm" means that the thickness of the heat conductive colloid along the first direction X can take any value between 1 mm and 2 mm, for example, it can be 1 mm, 1.5 mm, 2 mm, and the specific value of this thickness is not limited in this embodiment.

[0123] In the above technical solution, through the setting of the heat conductive colloid, the tiny gap between the contact part 1b and the current collecting component 5 can be filled, so as to form a continuous heat transfer path and improve the heat transfer efficiency between the current collecting component 5 and the contact part 1b. Since the heat conductive colloid has certain adhesiveness and buffering properties, setting the thickness of the heat conductive colloid along the first direction X between 1 mm and 2 mm can absorb the vibration or impact between the heat exchange plate 1 and the current collecting component 5, and will not overly occupy the space inside the box body 2 along the first direction X, and control the heat conduction resistance existing in the heat conductive colloid itself.

[0124] Please refer to Figure 6, in one embodiment, the end cap 32 has a third region 32a and a fourth region 32b distributed along the second direction Y. The third region 32a is recessed into the housing 31 compared to the fourth region 32b. The first direction X intersects with the second direction Y; the electrode terminal 321 is disposed in the third region 32a.

[0125] It should be noted that the "third region 32a" and the "fourth region 32b" can be understood as the physical structures on the end cap 32 observable in the first direction X; there can be one or multiple third regions 32a and fourth regions 32b on the end cap 32. For example, multiple third regions 32a and multiple fourth regions 32b can be sequentially spaced in the second direction Y, that is, there is one fourth region 32b between two third regions 32a, or there is one third region 32a between two fourth regions 32b; "the electrode terminal 321 is disposed in the third region 32a" means that the electrode terminal 321 penetrates through the third region 32a of the end cap 32 along the first direction X. Since the third region 32a is recessed inward compared to the fourth region 32b, the third region 32a should be closer to the electrode assembly inside the housing 31 than the fourth region 32b along the first direction X; generally, there will be a certain gap space between the end cap 32 and the electrode assembly to facilitate the accommodation of the adapter plate and the tab, and at the same time allow the gas generated by the electrode assembly to flow toward the pressure relief structure on the end cap 32.

[0126] In the above technical solution, the third region 32a of the end cap 32 is recessed into the housing 31 compared to the fourth region 32b, and the electrode terminal 321 is disposed in the third region 32a, which is beneficial to setting the electrode terminal 321 closer to the internal electrode assembly, compressing the void space inside the housing 31, thereby improving the space utilization rate inside the battery cell 3 and increasing its energy density.

[0127] Please refer to Figure 2 , in one embodiment, a first buffer portion 4 is provided between the heat exchange plate 1 and the inner wall of the box body 2.

[0128] It should be noted that the function of the "first buffer portion 4" is to mitigate the impact between the heat exchange plate 1 and the inner wall of the box body 2. There are various structural types of the first buffer portion 4. For example, the first buffer portion 4 can be a buffer foam or a buffer rubber; the shape and the number of settings of the first buffer portion 4 are not limited in this embodiment; "a first buffer portion 4 is provided between the heat exchange plate 1 and the inner wall of the box body 2" should generally be understood as that a first buffer portion 4 is provided between the heat exchange plate 1 and the inner wall of the box body 2 in the first direction X, and the inner wall of the box body 2 is usually the box cover 22.

[0129] In the above technical solution, through the setting of the first buffer part 4, a buffering effect can be achieved between the heat exchange plate 1 and the inner wall of the box body 2, improving the overall structural stability of the box body 2 and the heat exchange plate 1.

[0130] In one embodiment, the distance between the heat exchange plate 1 and the inner wall of the box body 2 in the first direction X is between 2 mm and 10 mm; wherein, the first buffer part 4 is arranged under pressure.

[0131] It should be noted that "the distance is between 2 mm and 10 mm" can be understood as that the distance can take any value between 2 mm and 10 mm, such as 2 mm, 3.5 mm, 7 mm, 10 mm, and the specific value of this distance is not limited in this embodiment; "the first buffer part 4 is arranged under pressure" means that in the natural state, that is, without any external force acting, the dimension of the first buffer part 4 in the first direction X should be greater than the distance between the heat exchange plate 1 and the inner wall of the box body 2 in the first direction X, that is, the first buffer part 4 can apply a supporting force in the first direction X to the heat exchange plate 1 and the inner wall of the box body 2 respectively.

[0132] In the above technical solution, the distance between the heat exchange plate 1 and the inner wall of the box body 2 is controlled between 2 mm and 10 mm, and the first buffer part 4 is arranged in a compressed state therebetween, ensuring that the first buffer part 4 can provide sufficient buffering and supporting effects while also being able to reduce the excessive occupation of the space of the box body 2 by the first buffer part 4.

[0133] In one embodiment, a second buffer part is also arranged between the heat exchange plate 1 and the battery cell 3.

[0134] It should be noted that the function of the "second buffer part" is to slow down the vibration and impact between the heat exchange plate 1 and the battery cell 3. There are various structural types of the second buffer part. For example, the second buffer part can be a buffer foam or a buffer rubber; the shape and the set number of the second buffer part are also not limited in this embodiment; the battery cell 3 is composed of a housing 31 and an end cap 32 covered, and this embodiment does not limit whether the second buffer part is specifically arranged between the heat exchange plate 1 and the housing 31 or between the heat exchange plate 1 and the end cap 32.

[0135] In the above technical solution, a second buffer part is arranged between the heat exchange plate 1 and the battery cell 3. Through the second buffer part, the impact or gravity of the heat exchange plate 1 can be transmitted to the housing 31 or the end cap 32 of the battery cell 3, increasing the force application points between the heat exchange plate 1 and the battery cell 3 other than the electrode terminal 321, and preventing the electrode terminal 321 from being damaged due to excessive pressure.

[0136] In one embodiment, the second buffer part at least partially overlaps with the housing 31 in the first direction X.

[0137] It should be noted that, based on the fact that the end cover 32 is closed on the housing 31 along the first direction X, it can be determined that the housing 31 has a continuous solid structure in the first direction X (for example, the side wall of the housing 31 extends in the first direction X); "the second buffer portion at least partially overlaps the housing 31 in the first direction X" should be understood as that in the projection of the second buffer portion in the first direction X, it at least partially overlaps the housing 31. Based on this, the impact force of the heat exchange plate 1 can act directly on the housing 31 through the second buffer portion.

[0138] In the above technical solution, since the housing 31 of the battery cell 3 has a continuous solid structure in the first direction X, the second buffer portion is arranged to at least partially overlap the housing 31 in the first direction X, and the second buffer portion can transfer the acting force of the heat exchange plate 1 to the housing 31 of the battery cell 3, thereby reducing the force on the end cover 32 and improving the deformation of the end cover 32 caused by the force.

[0139] In an embodiment, a plurality of battery cells 3 are stacked along the third direction Z, and the third direction Z intersects with the first direction X; two end plates are arranged in the box body 2, and the two end plates are respectively arranged on both sides of the plurality of battery cells 3 along the third direction Z; the heat exchange plate 1 is installed on the two end plates.

[0140] It should be noted that a plurality of battery cells 3 are stacked along the third direction Z, so as to form a battery row. The two end plates are respectively arranged on both sides of the battery row along the third direction Z. Generally, the end plates also abut against the corresponding solid structures in the box body 2, such as the expansion beam of the box body 2. The two ends of the heat exchange plate 1 along the third direction Z can be respectively installed on the two end plates through a threaded locking structure, or can be installed on the two end plates through a riveting structure. This embodiment does not limit this.

[0141] In the above technical solution, through the arrangement of the end plates, the battery cells 3 stacked along the third direction Z can be tightly limited, so as to resist the expansion deformation of the battery cells 3 during charging and discharging. Using the end plates to provide an installation basis for the heat exchange plate 1 can increase the structural compactness of the end plates, the battery cells 3 and the heat exchange plate 1, thereby improving the utilization rate of the internal space of the battery device 100 and being beneficial to improving the energy density of the battery device 100.

[0142] The present application also provides an electrical device, which includes a battery device 100 for providing electrical energy. The specific structure of the battery device 100 refers to the above embodiments. Since the present electrical device adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated herein one by one. Among them, the battery device 100 is used to provide electrical energy for the electrical device, and the electrical device includes, but is not limited to, new energy vehicles such as pure electric vehicles, hybrid electric vehicles, and range-extended electric vehicles, and may also include aircraft such as electric drones and electric passenger aircraft.

[0143] The present application provides a battery device 100, which includes a box body 2, a plurality of battery cells 3 and a heat exchange plate 1. The plurality of battery cells 3 are arranged in the box body 2. The battery cell 3 includes a housing 31 and an end cover 32. The end cover 32 covers the housing 31 along the first direction X. The end cover 32 has a third region 32a and a fourth region 32b distributed along the second direction Y. The third region 32a is recessed inward compared with the fourth region 32b. An electrode terminal 321 is arranged on the third region 32a. The electrode terminals 321 in two adjacent battery cells 3 are electrically connected through a bus bar component 5. The heat exchange plate 1 is arranged in the box body 2 and is located on one side of the battery cell 3 along the first direction X. A first buffer part 4 is arranged between the heat exchange plate 1 and the inner wall of the box body 2. The first buffer part 4 is compressed along the first direction X and has a thickness between 2 mm and 10 mm. The heat exchange plate 1 includes a cover plate 11 and a bottom plate 12 that are attached to each other along the first direction X, and a heat exchange cavity 1e is defined between the cover plate 11 and the bottom plate 12. The heat exchange cavity 1e includes an adjacent heat exchange flow channel 11e and a sealing cavity 12e. The bottom plate 12 includes a base part 121 and a contact part 1b. The contact part 1b and the base part 121 are joined by a hot pressing process or an injection molding process. Among them, the heat exchange flow channel 11e is defined between the contact part 1b and the cover plate 11 for flowing heat exchange fluid, and the sealing cavity 12e is defined between the base part 121 and the cover plate 11. A phase change heat exchange medium 13 is filled in the sealing cavity 12e. The materials of the base part 121 and the cover plate 11 are metal heat-conducting materials, and the contact part 1b is in contact with the bus bar component 5. The material of the contact part 1b is an insulating heat-conducting material. The melting point of the insulating heat-conducting material corresponds to the energy density of the battery cell 3. Among them, the energy density of the battery cell 3 is less than or equal to 390 Wh / L, and the melting point of the insulating heat-conducting material is greater than or equal to 200 °C and less than or equal to 250 °C; or, the energy density of the battery cell 3 is greater than 390 Wh / L, and the melting point of the insulating heat-conducting material is greater than 250 °C.

[0144] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the 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 of the claims and the description of 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 claims.

Claims

1. A battery device, characterized in that: include: Box; A plurality of battery cells are arranged in the box, the battery cells include a shell and an end cover, the end cover is covered on the shell along a first direction, an electrode terminal is arranged on the end cover, and the electrode terminals of two adjacent battery cells are electrically connected through a busbar component; and The heat exchange plate is arranged in the box body and is located on one side of the battery cell along the first direction. The heat exchange plate has a main body and a contact part. The contact part is connected to the main body and jointly defines a heat exchange cavity. The contact part abuts against the confluence component, wherein the material of the contact part is an insulating heat-conductive material.

2. The battery device according to claim 1, characterized in that: The insulating heat-conducting material is polycarbonate, polyphenylene sulfide, or epoxy resin.

3. The battery device according to claim 1, characterized in that: The energy density of the battery cell is less than or equal to 390Wh / L, and the melting point of the insulating thermal conductive material is greater than or equal to 200° C. and less than or equal to 250° C.; or, The energy density of the battery cell is greater than 390Wh / L, and the melting point of the insulating thermal conductive material is greater than 250°C.

4. The battery device according to claim 1, characterized in that: The material of the main body is a metal heat-conducting material.

5. The battery device according to claim 1, wherein: The contact portion and the main body portion are joined and arranged by a hot pressing process or an injection molding process.

6. The battery device according to claim 1, wherein: The heat exchange plate comprises a cover plate and a bottom plate, and the cover plate and the bottom plate are arranged in contact with each other along the first direction; The bottom plate includes a base portion and the contact portion, and the base portion is connected to the contact portion; Wherein, the main body includes the base part and the cover plate.

7. The battery device according to claim 1, characterized in that: The heat exchange chamber at least partially overlaps with the flow collecting component in the first direction.

8. The battery device according to claim 1, wherein: The heat exchange cavity includes a heat exchange channel, and the heat exchange channel is used for circulating a heat exchange fluid.

9. The battery device according to claim 1, characterized in that: The heat exchange cavity comprises a sealed cavity, and the sealed cavity is filled with a phase-change heat medium.

10. The battery device according to claim 9, characterized in that The heat exchange plate has a first region and a second region adjacent to each other, a heat exchange channel is formed in the first region, and the sealing cavity is formed in the second region; The heat exchange cavity includes the heat exchange flow channel.

11. The battery device according to any one of claims 1 to 10, characterized in that: A heat-conducting colloid is disposed between the contact portion and the current collecting component, and a thickness of the heat-conducting colloid along the first direction is between 1 mm and 2 mm.

12. The battery device according to any one of claims 1 to 10, characterized in that: The end cover has a third area and a fourth area distributed along a second direction, the third area is recessed into the shell compared to the fourth area, and the first direction intersects with the second direction; The electrode terminal is disposed in the third region.

13. The battery device according to any one of claims 1 to 10, characterized in that: A first buffer portion is provided between the heat exchange plate and the inner wall of the box body.

14. The battery device according to claim 13, characterized in that: The distance between the heat exchange plate and the inner wall of the box body in the first direction is between 2 mm and 10 mm; Wherein, the first buffer portion is arranged to be under pressure.

15. The battery device according to any one of claims 1 to 10, characterized in that: A second buffer portion is further provided between the heat exchange plate and the battery cell.

16. The battery device according to claim 15, characterized in that The second buffer portion at least partially overlaps the housing in the first direction.

17. The battery device according to any one of claims 1 to 10, characterized in that: The plurality of battery cells are stacked along a third direction, and the third direction intersects with the first direction; Two end plates are arranged in the box body, and the two end plates are respectively arranged on both sides of the plurality of battery cells along the third direction; The heat exchange plate is installed on the two end plates.

18. An electrical equipment, characterized in that: Comprising a battery device as claimed in any one of claims 1 to 17.

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