Battery device, power utilization device and energy storage device

Abstract

The utility model discloses a battery device, a power utilization device and an energy storage device. The battery device comprises a battery monomer group, the battery monomer group comprises at least two battery monomers arranged along a first direction, each battery monomer comprises a shell and an electrode terminal, the shell comprises first shell walls oppositely arranged along the first direction and second shell walls oppositely arranged along a second direction, and the electrode terminals are arranged on the second shell walls; the first heat exchange piece is arranged on the first side of the battery monomer group along the second direction; the second heat exchange piece is in contact with the first shell wall of the battery monomer; the third heat exchange piece is arranged on the second side of the battery monomer group in the second direction, and the first side and the second side are oppositely arranged; at least two of a first heat exchange flow channel of the first heat exchange piece, a second heat exchange flow channel of the second heat exchange piece and a third heat exchange flow channel of the third heat exchange piece are communicated, and the first direction is perpendicular to the second direction. Heat exchange is carried out on the two sides of the battery monomer group, so that the heat exchange efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to battery devices, power-consuming devices, and energy storage devices. Background Art

[0002] New energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly used in areas such as energy storage.

[0003] Temperature has an important impact on battery performance. Too high or too low a temperature may affect the performance and service life of the battery. Therefore, during the battery manufacturing process, it is necessary to assemble a heat exchange component on the battery to dissipate heat or increase the temperature of the battery so that the battery can work within a normal temperature range. How to improve the heat exchange efficiency of battery heat exchange is one of the research topics in the industry. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a battery device capable of improving heat exchange efficiency, and an electrical device and an energy storage device including the battery device.

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

[0006] A first aspect of the present application provides a battery device, comprising: a battery cell group, comprising at least two battery cells arranged along a first direction, the battery cells comprising a shell and an electrode terminal, the shell comprising a first shell wall arranged opposite to each other along the first direction and a second shell wall arranged opposite to each other along a second direction, the electrode terminal being arranged on the second shell wall; a first heat exchange member, a second shell wall arranged opposite to each other along the second direction, the electrode terminal being arranged on the second shell wall and arranged on a first side of the battery cell group in the second direction; a second heat exchange member, contacting the first shell wall of the battery cell; a third heat exchange member, arranged on a second side of the battery cell group along the second direction, the first side being arranged opposite to the second side; wherein at least two of the first heat exchange channel of the first heat exchange member, the second heat exchange channel of the second heat exchange member and the third heat exchange channel of the third heat exchange member are connected, and the first direction is perpendicular to the second direction.

[0007] The present application sets three heat exchangers, the first heat exchanger and the third heat exchanger are respectively located on both sides of the battery cell group, and the second heat exchanger is in contact with the first shell wall of the battery cell. Such a setting can perform heat exchange on both sides of the battery cell group, increasing the heat exchange area, thereby improving the heat exchange efficiency. In addition, the heat exchange channels of at least two of the three heat exchangers are connected, which is conducive to improving the circulation efficiency of the heat exchange medium.

[0008] In some embodiments, the battery device includes a connecting piece, a connecting cavity is formed in the connecting piece, and at least two of the first heat exchange channel, the second heat exchange channel, and the third heat exchange channel are connected through the connecting cavity.

[0009] At least two heat exchangers are connected by a connecting piece, so that the heat exchange channels of the two heat exchangers are connected through the connecting cavity to realize the circulation of the heat exchange medium in the two heat exchangers. The connecting piece is provided to connect the two heat exchangers, and the manufacturing of the device can be completed by assembly in the production process stage, which is conducive to reducing the difficulty of the production process and saving production costs.

[0010] In some embodiments, the connecting member is provided as a pair, and the pair of the connecting members are arranged opposite to each other along the first direction, or the pair of the connecting members are arranged at intervals along the third direction; the first direction, the second direction, and the third direction are perpendicular to each other.

[0011] Providing a pair of connecting pieces is beneficial to further improving the circulation efficiency of the heat exchange medium, thereby improving the heat exchange efficiency.

[0012] In some embodiments, the connecting piece includes a first connecting port, a second connecting port and a third connecting port, the first connecting port connects the first heat exchange channel and the connecting cavity, the second connecting port connects the second heat exchange channel and the connecting cavity, and the third connecting port of one of the connecting pieces in a pair of the connecting pieces connects the liquid inlet pipeline and the connecting cavity, and the third connecting port of the other connecting piece in a pair of the connecting pieces connects the liquid outlet pipeline and the connecting cavity; the heat exchange medium flows into the first heat exchange channel and the second heat exchange channel through the third connecting port connected to the liquid inlet pipeline, and the heat exchange medium in the first heat exchange channel and the second heat exchange channel flows out through the third connecting port connected to the liquid outlet pipeline.

[0013] The first heat exchanger and the second heat exchanger are connected through a connecting piece to realize the circulation of the heat exchange medium in the first heat exchanger and the second heat exchanger. The heat exchange medium transported through the liquid inlet pipeline can flow into the connecting cavity of the connecting piece through the third connecting port of one of the pair of connecting pieces, and flow out of the first heat exchange flow channel and the second heat exchange flow channel through the first connecting port and the second connecting port of the connecting piece respectively. The heat exchange medium in the first heat exchange flow channel and the second heat exchange flow channel flows into the connecting cavity of the connecting piece through the first connecting port and the second connecting port of the other connecting piece in the pair of connecting pieces respectively, and flows out to the liquid outlet pipeline through the third connecting port of the connecting piece. Therefore, through a pair of connecting pieces, a liquid inlet pipeline and a liquid outlet pipeline, not only can the effect of connecting the first heat exchanger and the second heat exchanger to improve the heat exchange efficiency be achieved, but also the heat exchange medium can flow in and out through the third connecting port to improve the circulation efficiency of the heat exchange medium, which is conducive to further improving the heat exchange efficiency, and is also conducive to reducing the number of parts, reducing the difficulty of assembly, and reducing production costs.

[0014] In some embodiments, the connecting piece includes a first connecting port, a second connecting port and a third connecting port, the first connecting port connects the third heat exchange channel and the connecting cavity, the second connecting port connects the second heat exchange channel and the connecting cavity, and the third connecting port of one connecting piece connects the liquid inlet pipeline and the connecting cavity, and the third connecting port of another connecting piece connects the liquid outlet pipeline and the connecting cavity; the heat exchange medium flows into the second heat exchange channel and the third heat exchange channel through the third connecting port connected to the liquid inlet pipeline, and the heat exchange medium in the second heat exchange channel and the third heat exchange channel flows out through the third connecting port connected to the liquid outlet pipeline.

[0015] The second heat exchanger and the third heat exchanger are connected through a connecting piece to realize the circulation of the heat exchange medium in the second heat exchanger and the third heat exchanger. The heat exchange medium transported through the liquid inlet pipeline can flow into the connecting cavity of the connecting piece through the third connecting port of one of the pair of connecting pieces, and flow out of the third heat exchange flow channel and the second heat exchange flow channel through the first connecting port and the second connecting port of the connecting piece, respectively. The heat exchange medium in the third heat exchange flow channel and the second heat exchange flow channel flows into the connecting cavity of the connecting piece through the first connecting port and the second connecting port of the other connecting piece in the pair of connecting pieces, respectively, and flows out to the liquid outlet pipeline through the third connecting port of the connecting piece. Therefore, through a pair of connecting pieces, a liquid inlet pipeline and a liquid outlet pipeline, not only can the effect of connecting the second heat exchanger and the third heat exchanger to improve the heat exchange efficiency be realized, but also the heat exchange medium can flow in and out through the third connecting port to improve the circulation efficiency of the heat exchange medium, which is conducive to further improving the heat exchange efficiency, and is also conducive to reducing the number of parts, reducing the difficulty of assembly, and reducing production costs.

[0016] In some embodiments, there are multiple second heat exchange elements, and the multiple second heat exchange elements are arranged at intervals along the first direction, and the second heat exchange channels of the multiple second heat exchange elements are connected through the tube cavity of the tube body, and the second connecting port of the connecting element connects the tube cavity and the connecting cavity.

[0017] The second heat exchanger is provided in plurality, and can achieve heat exchange for the plurality of battery cells by contacting with the first shell wall of the plurality of battery cells in a battery cell group, and the heat exchange efficiency is higher. The plurality of second heat exchangers are connected through the tube cavity, so that the heat exchange medium can flow through the plurality of second heat exchangers to achieve heat exchange. The tube cavity of the tube body is connected with the connecting cavity through the second connecting port of the connecting piece, so that after the plurality of second heat exchangers are connected to each other, they only need to be connected with one connecting piece to achieve connection with other heat exchangers, instead of each second heat exchanger requiring a separate connecting piece to achieve connection with other heat exchangers, which is conducive to simplifying the process and saving space.

[0018] In some embodiments, the connecting piece includes a first connecting port, a second connecting port and a third connecting port, the first connecting port connects the first heat exchange channel and the connecting cavity, the second connecting port connects the third heat exchange channel and the connecting cavity, and the third connecting port of one connecting piece connects the liquid inlet pipeline and the connecting cavity, and the third connecting port of another connecting piece connects the liquid outlet pipeline and the connecting cavity; the heat exchange medium flows into the first heat exchange channel and the third heat exchange channel through the third connecting port connected to the liquid inlet pipeline, and the heat exchange medium in the first heat exchange channel and the third heat exchange channel flows out through the third connecting port connected to the liquid outlet pipeline.

[0019] The first heat exchanger and the third heat exchanger are connected through a connecting piece to realize the circulation of the heat exchange medium in the first heat exchanger and the third heat exchanger. The heat exchange medium transported through the liquid inlet pipeline can flow into the connecting cavity of the connecting piece through the third connecting port of one of the pair of connecting pieces, and flow out of the first heat exchange flow channel and the third heat exchange flow channel respectively through the first connecting port and the second connecting port of the connecting piece. The heat exchange medium in the first heat exchange flow channel and the third heat exchange flow channel flows into the connecting cavity of the connecting piece through the first connecting port and the second connecting port of the other connecting piece in the pair of connecting pieces respectively, and flows out to the liquid outlet pipeline through the third connecting port of the connecting piece. Therefore, through a pair of connecting pieces, an inlet pipeline and a liquid outlet pipeline, not only can the effect of connecting the first heat exchanger and the third heat exchanger to improve the heat exchange efficiency be realized, but also the heat exchange medium can flow in and out through the third connecting port to improve the circulation efficiency of the heat exchange medium, which is conducive to further improving the heat exchange efficiency, and is also conducive to reducing the number of parts, reducing the difficulty of assembly, and reducing production costs.

[0020] In some embodiments, the connecting member includes a first connecting port, a second connecting port, a third connecting port and a fourth connecting port, the first connecting port connects the first heat exchange channel and the connecting cavity, the second connecting port connects the second heat exchange channel and the connecting cavity, the third connecting port connects the third heat exchange channel and the connecting cavity, and the fourth connecting port of one connecting member connects the liquid inlet pipeline and the connecting cavity, and the fourth connecting port of another connecting member connects the liquid outlet pipeline and the connecting cavity; the heat exchange medium flows into the first heat exchange channel, the second heat exchange channel and the third heat exchange channel through the fourth connecting port connected to the liquid inlet pipeline, and the heat exchange medium in the first heat exchange channel, the second heat exchange channel and the third heat exchange channel flows out through the fourth connecting port connected to the liquid outlet pipeline.

[0021] The first heat exchange element, the second heat exchange element and the third heat exchange element are connected through the connecting element to achieve the circulation of the heat exchange medium in the first heat exchange element, the second heat exchange element and the third heat exchange element. The heat exchange medium transported through the liquid inlet pipeline can flow into the connecting cavity of the connecting piece through the fourth connecting port of one of the connecting pieces in a pair of connecting pieces, and flow out of the first heat exchange channel, the second heat exchange channel and the third heat exchange channel through the first connecting port, the second connecting port and the third connecting port of the connecting piece, respectively. The heat exchange medium in the first heat exchange channel, the second heat exchange channel and the third heat exchange channel flows into the connecting cavity of the connecting piece through the first connecting port, the second connecting port and the third connecting port of the other connecting piece in the pair of connecting pieces, respectively, and flows out to the liquid outlet pipeline through the fourth connecting port of the connecting piece. Therefore, through a pair of connecting pieces, an inlet pipeline and a liquid outlet pipeline, not only can the effect of connecting the first heat exchange piece, the second heat exchange piece and the third heat exchange piece to improve the heat exchange efficiency be achieved, but also the heat exchange medium can flow in and out through the third connecting port to improve the circulation efficiency of the heat exchange medium, which is conducive to further improving the heat exchange efficiency, and is also conducive to reducing the number of parts, reducing the difficulty of assembly, and reducing production costs. In addition, the three heat exchange pieces are connected together through the connecting piece, which is conducive to saving space.

[0022] In some embodiments, the battery device further comprises a box body, wherein the battery cell group is accommodated in the box body; the box body is formed with a liquid inlet and a liquid outlet, and the liquid inlet pipeline and the liquid outlet pipeline are respectively connected to the liquid inlet and the liquid outlet.

[0023] The battery cell group is contained in the box, and the box can protect the battery cell group. The box is provided with a liquid inlet and a liquid outlet connected to the liquid inlet pipeline and the liquid outlet pipeline respectively, so as to facilitate the circulation of the heat exchange medium. In addition, since the heat exchange medium passes through the box during the circulation process, the box can also play a certain role in heat exchange to improve the heat exchange effect.

[0024] In some embodiments, a portion of the second shell wall is recessed along the second direction toward the interior of the shell to form a recessed portion, and the electrode terminal is disposed in the recessed portion.

[0025] Since a portion of the second shell wall is recessed along the second direction to form a recessed portion, and the electrode terminal is arranged in the recessed portion, the space occupied by the electrode terminal in the second direction is reduced, and the space utilization rate of the battery cell is improved, which is beneficial to improving the energy density of the battery device.

[0026] In some embodiments, the recessed portion is located at one end of the shell along the third direction, the recessed portions of each battery cell of a battery cell group are located on the same side along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other; the battery device also includes a sampling component, and along the second direction, the sampling component is arranged on a side of the battery cell group where the recessed portion is formed, or the sampling component is arranged at an end of the battery cell group along the second direction, and the sampling component is electrically connected to the electrode terminals of each of the battery cells.

[0027] Since the recessed portion is formed at one end of the shell along the third direction, the space reserved in the entire length direction of the battery cell for setting the electrode terminal is saved, and the saved space can be used to arrange components such as the sampling assembly. In addition, the electrode terminal does not occupy the space on both sides of the shell in the third direction, which improves the space utilization of the battery cell and the battery device, thereby facilitating the improvement of the energy density of the battery device.

[0028] In addition, the battery device includes a sampling component, which can collect information by electrically connecting to the electrode terminal provided in the recessed portion. When the sampling component is provided on the side of the battery cell group where the recessed portion is formed along the second direction, the space saved by the battery cells along the second direction can be fully utilized to arrange the sampling component, and no additional arrangement space needs to be reserved for the sampling component, thereby making the layout of each component in the battery device more reasonable, which is conducive to improving the space utilization rate, and further conducive to improving the energy density of the battery device. When the sampling component is provided at the end of the battery cell group, it will not occupy the space in the second direction of the battery device, and the recessed portion can reduce the waste of space in the box of the battery device when the battery cells are arranged, thereby improving the volume utilization rate of the battery device, and making the battery device composed of battery cells have a higher energy density.

[0029] In some embodiments, the battery device further includes a sampling assembly, the battery cell includes an electrode terminal, the sampling assembly is electrically connected to the electrode terminal, and the first heat exchange member is formed with an opening; in a projection plane perpendicular to the second direction, the projection of the sampling assembly falls within the projection range of the opening.

[0030] Thus, the sampling component can be electrically connected to the electrode terminal through the opening to collect information. Such a setting can increase the heat exchange area and improve the heat exchange efficiency while also facilitating the sampling component to collect information. In addition, the setting of the opening can reduce the overall weight of the battery device, which is conducive to achieving lightweight battery devices.

[0031] In some embodiments, there are multiple battery cell groups, and the multiple battery cell groups are arranged along a third direction. Along the third direction, the arrangement areas of the electrode terminals of two adjacent battery cell groups are arranged opposite to each other or back to back, and the first direction, the second direction, and the third direction are perpendicular to each other; there are multiple openings, and the multiple openings are arranged along the third direction.

[0032] Multiple battery cell groups can be arranged along a third direction, which is beneficial to further increase the energy density of the battery device. The arrangement areas of the electrode terminals of two adjacent battery cell groups are arranged opposite to each other or opposite to each other, and the opening is arranged along the third direction, so that the sampling component can be electrically connected to the electrode terminals of multiple battery cells in at least one battery cell group through an opening to collect information.

[0033] In some embodiments, the arrangement areas of the electrode terminals of two adjacent battery cell groups along the third direction are arranged relative to each other, and the arrangement areas of the electrode terminals arranged relatively to each other jointly form sampling areas of the two adjacent battery cell groups; in a projection plane perpendicular to the second direction, projections of the sampling areas of the two adjacent battery cell groups fall within the projection range of one of the openings.

[0034] Thus, the sampling assembly can be electrically connected to the electrode terminals of multiple battery cells in two adjacent battery cell groups through an opening to collect information. Such a setting, on the one hand, can reduce the setting of the opening to increase the area of ​​the first heat exchange component, thereby increasing the heat exchange area to improve the heat exchange efficiency. On the other hand, the information collection of multiple battery cells in two adjacent battery cell groups through an opening is conducive to achieving the compactness of the internal structure of the battery device.

[0035] In some embodiments, the recessed portion is configured to penetrate along the first direction, and the second shell wall includes a first section, a second section, and a third section connected in sequence. Along the second direction, the third section is recessed toward the interior of the shell relative to the first section, and the second section and the third section form the recessed portion; the electrode terminal is arranged in the third section.

[0036] Since the recessed portion is configured to penetrate along the first direction, when multiple battery cells are arranged and stacked along the first direction, the recessed portions of each battery cell can be connected to each other, thereby facilitating electrical connection between the electrode terminals of each battery cell and the external conductive structure, thereby achieving electrical connection between each battery cell in the battery cell group.

[0037] In some embodiments, a dimension of the second segment along the second direction is in a range of 3 mm to 10 mm.

[0038] Thus, the size of the second section along the second direction is within a suitable range, so that the recessed portion has a sufficient size to accommodate the electrode terminal while reducing the occupation of the internal space of the shell, thereby taking into account the reliability and energy density of the battery cell.

[0039] In some embodiments, a dimension of the electrode terminal protruding from the third section along the second direction is in a range of 0.5 mm to 3 mm.

[0040] As a result, the dimension of the electrode terminal protruding from the third section along the second direction is within an appropriate range, so that the electrode terminal will not exceed the recessed portion along the second direction without affecting the electrical connection of the electrode terminal to the external conductive structure, thereby reducing the dimension of the battery cell in the second direction, which is beneficial to improving the energy density of the battery cell.

[0041] In some embodiments, a dimension of the third segment along the third direction is in the range of 80 mm to 400 mm.

[0042] Thus, the dimension of the third section along the third direction is within a suitable range, so that the recessed portion has enough space to accommodate the two electrode terminals, and the two electrode terminals are not easily overlapped and short-circuited. In addition, the space occupied by the inner shell can be reduced, taking into account the reliability and energy density of the battery cell.

[0043] In some embodiments, the dimension of the battery cell along the first direction is in the range of 10mm to 35mm; and / or the dimension of the battery cell along the second direction is in the range of 80mm to 130mm; and / or the dimension of the battery cell along the third direction is in the range of 300mm to 1300mm.

[0044] Therefore, the battery cell is a blade battery, and by designing the size of the battery cell to satisfy the above relationship, it is beneficial to take into account both the energy density and the stacking efficiency of the battery cell.

[0045] In some embodiments, the first shell wall is the shell wall with the largest area of ​​the shell.

[0046] As a result, the second heat exchange element can exchange heat with the shell wall of the battery cell group with the largest area, which is beneficial to improving the heat exchange efficiency of the battery cell group.

[0047] A second aspect of the present application provides an electrical device, which includes the battery device described in the first aspect of the present application for providing electrical energy.

[0048] Since the electrical device includes the battery device provided by the first aspect of the embodiment of the present application, it is beneficial to increase the heat exchange area of ​​the electrical device, thereby improving the heat exchange efficiency.

[0049] A third aspect of the present application provides an energy storage device, which includes the battery device described in the first aspect of the present application for storing electrical energy or providing electrical energy.

[0050] Since the energy storage device includes the battery device provided by the first aspect of the embodiment of the present application, it is beneficial to increase the heat exchange area of ​​the energy storage device, thereby improving the heat exchange efficiency.

[0051] The beneficial effects of the embodiments of the present application include: through the present application, the heat exchange area of ​​the battery device can be increased, thereby improving the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0053] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application;

[0054] Figure 2 A three-dimensional exploded schematic diagram of a battery device (without a heat exchanger) provided in some embodiments of the present application;

[0055] Figure 3 A schematic diagram of a three-dimensional structure of multiple battery cell groups provided for some embodiments of the present application;

[0056] Figure 4 A schematic diagram of a partial three-dimensional exploded structure of a battery device provided in some embodiments of the present application;

[0057] Figure 5 A partial planar structural schematic diagram of a battery device provided in some embodiments of the present application;

[0058] Figure 6 A schematic diagram of a three-dimensional structure of a connecting piece of a battery device provided in some embodiments of the present application;

[0059] Figure 7 Schematic diagram of the planar structure of the battery device in the second direction provided in some embodiments of the present application Figure 1 ;

[0060] Figure 8 A schematic diagram of the three-dimensional structure of a battery cell group provided in some embodiments of the present application;

[0061] Fig. 9 Schematic diagram of the planar structure of the battery device in the second direction provided in some embodiments of the present application Figure 2 .

[0062] Description of Reference Numerals

[0063] 1. Battery cell; 10. Battery cell group; 2. Shell; 20. First heat exchange member; 30. Second heat exchange member; 31. Tube; 40. Third heat exchange member; 21. First shell wall; 22. Second shell wall; 211. First section; 212. Second section; 213. Third section; 23. Opening; 3. Electrode terminal; 4. Recessed portion; 5. Connecting piece; 50. Box; 50a. First box; 50b. Second box; 510. Accommodating space; 51. First connecting port; 52. Second connecting port; 53. Third connecting port; 501. Liquid inlet; 502. Liquid outlet; 100. Battery device; 200. Controller; 300. Motor; 1000. Vehicle; A. Sampling area. DETAILED DESCRIPTION

[0064] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions.

[0066] In the description of the embodiments of the present application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0067] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0068] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0069] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0070] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0071] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0072] Below, this application is described in detail.

[0073] At present, new energy batteries are increasingly used in life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0074] Temperature has an important impact on battery performance. Too high or too low a temperature may affect the performance and service life of the battery. Therefore, during the battery manufacturing process, it is necessary to assemble a heat exchange component on the battery to dissipate heat or increase the temperature of the battery so that the battery can work within a normal temperature range. How to improve the heat exchange efficiency of battery heat exchange is one of the research topics in the industry.

[0075] In the related art, heat exchange is performed by contacting the heat exchange component with the shell wall of the battery cell. However, such a configuration is difficult to further improve the heat exchange efficiency. Therefore, there is room for further optimization.

[0076] In response to the problems existing in the above-mentioned related technologies, the present application proposes a battery device, which includes a battery cell group, a first heat exchange member, a second heat exchange member and a third heat exchange member. The battery cell group includes at least two battery cells arranged along a first direction, and the battery cell includes a shell and an electrode terminal. The shell includes a first shell wall arranged oppositely along the first direction and a second shell wall arranged oppositely along the second direction, and the electrode terminal is arranged on the second shell wall. The first heat exchange member is arranged on the first side of the battery cell group along the second direction. The second heat exchange member contacts the first shell wall of the battery cell. The third heat exchange member is arranged on the second side of the battery cell group along the second direction, and the first side is arranged opposite to the second side. Among them, at least two of the first heat exchange channel of the first heat exchange member, the second heat exchange channel of the second heat exchange member and the third heat exchange channel of the third heat exchange member are connected, and the first direction is perpendicular to the second direction.

[0077] The present application sets three heat exchangers, the first heat exchanger and the third heat exchanger are respectively located on both sides of the battery cell group, and the second heat exchanger is in contact with the first shell wall of the battery cell. Such a setting can perform heat exchange on both sides of the battery cell group, increasing the heat exchange area, thereby improving the heat exchange efficiency. In addition, the heat exchange channels of at least two of the three heat exchangers are connected, which is conducive to improving the circulation efficiency of the heat exchange medium.

[0078] The battery device provided in the embodiments of the present application can be used, but is not limited to, in energy storage power supply systems, electrical devices such as vehicles, ships or aircraft, and energy storage devices such as energy storage containers and energy storage cabinets.

[0079] The embodiment of the present application provides an electric device including the above-mentioned battery device for providing electric energy, and the electric device includes but is not limited to mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, the electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc., and the spacecraft may include airplanes, rockets, space shuttles and spacecrafts, etc.

[0080] In the following embodiments, for the convenience of description, the electric device of one embodiment of the present application is taken as a vehicle 1000 as an example for description. The following is a description with reference to the accompanying drawings.

[0081] Figure 1 The schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. Figure 1 As shown, a battery device 100 is disposed inside the vehicle 1000, and the battery device 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000, for example, the battery device 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for the starting, navigation, and working power requirements of the vehicle 1000 during driving.

[0082] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0083] Below, refer to Figures 2 to 9 Some embodiments of the present application are described in detail.

[0084] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application; Figure 2 A three-dimensional exploded schematic diagram of a battery device (without a heat exchanger) provided in some embodiments of the present application; Figure 3 A schematic diagram of a three-dimensional structure of multiple battery cell groups provided for some embodiments of the present application; Figure 4 A schematic diagram of a partial three-dimensional exploded structure of a battery device provided in some embodiments of the present application; Figure 5 A partial planar structural schematic diagram of a battery device provided in some embodiments of the present application; Figure 6 A schematic diagram of a three-dimensional structure of a connecting piece of a battery device provided in some embodiments of the present application; Figure 7 Schematic diagram of the planar structure of the battery device in the second direction provided in some embodiments of the present application Figure 1 ; Figure 8 A schematic diagram of the three-dimensional structure of a battery cell group provided in some embodiments of the present application; Fig. 9 Schematic diagram of the planar structure of the battery device in the second direction provided in some embodiments of the present application Figure 2 .

[0085] In some embodiments of the present application, for the convenience of description, a first direction, a second direction, and a third direction are set, and the first direction, the second direction, and the third direction are perpendicular to each other, but those skilled in the art should understand that the embodiments of the present application are not limited to the situation where the three directions are perpendicular to each other. Figures 3 to 5 , Figure 8 and Fig. 9 As shown by the arrows in , the direction of arrow X is the first direction, the direction of arrow Y is the second direction, and the direction of arrow Z is the third direction. Sometimes, the first direction is also called the thickness direction of the battery cell, the second direction is called the height direction of the battery cell, and the third direction is called the length direction of the battery cell. Sometimes, the direction indicated by arrow Z is also called "upward", and the opposite direction is called "downward".

[0086] The first aspect of the present application provides a battery device 100, which includes a battery cell group 10, a first heat exchanger 20, a second heat exchanger 30 and a third heat exchanger 40. The battery cell group 10 includes at least two battery cells 1 arranged along a first direction, the battery cell 1 includes a shell 2 and an electrode terminal, the shell 2 includes a first shell wall 21 arranged oppositely along the first direction and a second shell wall 22 arranged oppositely along the second direction, and the electrode terminal 3 is arranged on the second shell wall 22. The first heat exchanger 20 is arranged on the first side of the battery cell group along the second direction. The second heat exchanger 30 contacts the first shell wall 21 of the battery cell 1. The third heat exchanger 40 is arranged on the second side of the battery cell group 10 along the second direction, and the first side is arranged opposite to the second side. Among them, at least two of the first heat exchange channel of the first heat exchanger 20, the second heat exchange channel of the second heat exchanger 30 and the third heat exchange channel of the third heat exchanger 40 are connected, and the first direction is perpendicular to the second direction.

[0087] The present application sets three heat exchangers, the first heat exchanger and the third heat exchanger are respectively located on both sides of the battery cell group, and the second heat exchanger is in contact with the first shell wall of the battery cell. Such a setting can perform heat exchange on both sides of the battery cell group, increasing the heat exchange area, thereby improving the heat exchange efficiency. In addition, the heat exchange channels of at least two of the three heat exchangers are connected, which is conducive to improving the circulation efficiency of the heat exchange medium.

[0088] The three heat exchangers of the first heat exchanger 20, the second heat exchanger 30 and the third heat exchanger 40 of the present application may refer to components for heat exchange of the battery cells 1 in the battery device 100, and each of them has a heat exchange flow channel. For example, a high-temperature medium may be introduced into the heat exchange flow channel of the heat exchanger to heat the battery cell 1, or a cooling medium may be introduced into the heat exchange flow channel to accelerate the heat dissipation of the battery cell 1, so that the battery cell 1 in the battery device 100 can always operate within a normal temperature range, thereby improving the performance and service life of the battery device 100.

[0089] The first heat exchange element 20, the second heat exchange element 30 and the third heat exchange element 40 can all be substantially in the shape of rectangular plates. The plate-shaped heat exchange elements can increase the contact area with the battery cell 1, thereby increasing the heat exchange area between the heat exchange elements and the battery cell 1 and improving the heat exchange efficiency.

[0090] Of course, those skilled in the art should understand that the embodiment of the present application does not specifically limit the shapes of the first heat exchanger 20, the second heat exchanger 30 and the third heat exchanger 40, and the first heat exchanger 20, the second heat exchanger 30 and the third heat exchanger 40 can also be any other suitable shape. The battery apparatus 100 mentioned in the embodiment of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly 10 may include a plurality of battery cells 1, and the plurality of battery cells 1 may be connected in series, in parallel or in mixed connection.

[0091] In some embodiments, the battery cell group 10 is generally formed by arranging a plurality of battery cells 1 .

[0092] As an example, the battery cell group 10 may be a battery module (Battery Module), which is formed by arranging and fixing a plurality of battery cells 1 to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells 1 with a cable tie.

[0093] In some embodiments, the battery device 100 may be a battery pack, which includes a case 50 and one or more battery cell groups 10 . The battery cell groups 10 are accommodated in the case 50 .

[0094] As an example, the battery cell group 10 may be a battery module, and the battery cell group 10 may be accommodated in the box body 50 by fixing the battery module in the box body 50 .

[0095] As an example, the battery cell group 10 may also be accommodated in the case 50 by directly fixing the plurality of battery cells 1 to the case 50 .

[0096] In the embodiment of the present application, the battery cell 1 may be a secondary battery. A secondary battery refers to a battery cell 1 that can be continuously used by activating active materials by charging after the battery cell 1 is discharged.

[0097] The battery cell 1 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0098] like Figure 2 and Figure 3 As shown, the battery cell 1 includes a housing 2, an electrode terminal 3 and an electrode assembly (not shown in the figure).

[0099] The housing 2 may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene) or a composite metal housing (such as a copper-aluminum composite housing), etc. The housing 2 may be a sealed structure or a non-sealed structure.

[0100] As an example, when the shell 2 is a non-sealed structure, the shell 2 plays a role in protecting the electrode assembly, and a sealing bag is also included between the shell 2 and the electrode assembly, and the sealing bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the shell 2 is a sealed structure, it is used to directly encapsulate components such as the electrode assembly and the electrolyte.

[0101] Although not shown in the figure, the electrode assembly includes a positive electrode, a negative electrode and a separator, and the separator is arranged between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell 1, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow the active ions to pass through.

[0102] In some embodiments, the electrode assembly is provided with tabs (not shown), which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0103] In some embodiments, the electrode assembly may be a wound structure, a laminated structure, or a mixed structure of a wound structure and a laminated structure.

[0104] The electrode terminal 3 may be, for example, a pole, and the electrode terminal 3 is electrically connected to the pole tab. Exemplarily, the electrode terminal 3 may be directly connected to the pole tab, or may be indirectly connected to the pole tab through a current collecting member.

[0105] like Figure 4 As shown, the shell 2 includes a plurality of shell walls, which together enclose a housing cavity of the shell, and the electrode assembly, electrolyte, etc. are located in the housing cavity.

[0106] Illustratively, the plurality of housing walls may be formed as a unitary structure.

[0107] As another example, the plurality of shell walls may be separate structures and then assembled together by welding, bonding, clamping, or the like.

[0108] In the embodiment of the present application, the housing 2 is substantially in the shape of a cuboid. In some other embodiments, the housing 2 may also be in any other suitable shape such as a cube.

[0109] Specifically, the housing wall includes a pair of first housing walls 21 arranged opposite to each other along a first direction. In the embodiment of the present application, the first housing wall 21 is the largest housing wall of the battery cell 1, so the first housing wall 21 can also be called the large surface of the battery cell 1.

[0110] In the present application, the second heat exchange element 30 has a second heat exchange flow channel for the heat exchange medium to flow. Figure 4 As shown, the second heat exchanger 30 contacts the first housing wall 21 of the battery cell 1, and through the contact, the second heat exchanger 30 can exchange heat with the battery cell 1. For example, the second heat exchanger 30 can remove heat from the battery cell 1 through heat exchange to cool the battery cell 1.

[0111] In some embodiments, the first housing wall 21 is the housing wall with the largest area of ​​the housing 2 .

[0112] In the present application, the housing 2 of the battery cell 1 may have a plurality of housing walls located in different planes, wherein the first housing wall 21 may be the housing wall with the largest area.

[0113] Based on the fact that the area of ​​the first shell wall 21 is the largest, the area of ​​the surface of the first shell wall 21 in contact with the second heat exchange element 30 is larger than the area of ​​the first side of the battery cell group 10, and the area of ​​the surface of the first shell wall 21 in contact with the second heat exchange element 30 is larger than the area of ​​the second side of the battery cell group 10.

[0114] As a result, the second heat exchange element can exchange heat with the shell wall of the battery cell group with the largest area, which is beneficial to improving the heat exchange efficiency of the battery cell group.

[0115] In the present application, the heat exchange medium includes but is not limited to ethylene glycol solution, pure water, oil, etc. During the flow of the heat exchange medium in the second heat exchange flow channel, when the temperature of the heat exchange medium is higher than the temperature of the battery cell 1, the heat of the heat exchange medium can be transferred to the battery cell 1, thereby increasing the temperature of the battery cell 1; when the temperature of the heat exchange medium is lower than the temperature of the battery cell 1, the heat of the battery cell 1 can be transferred to the heat exchange medium, thereby reducing the temperature of the battery cell 1. Thus, by introducing heat exchange media with different temperatures into the heat exchange flow channel, the battery cell 1 can always operate within a normal temperature range, which is beneficial to improving the performance and service life of the battery device 100.

[0116] In some embodiments of the present application, Figure 4 and Figure 5 As shown, the first heat exchange member 20 and the third heat exchange member 40 are respectively located on two opposite sides of the battery cell group 10 in the second direction. For example, in some embodiments, the second direction is parallel to the gravity direction, and the first heat exchange member 20 and the third heat exchange member 40 can be respectively located on two sides of the battery cell group 10 in the gravity direction, that is, the first heat exchange member 20 and the third heat exchange member 40 can be respectively located at the top and the bottom of the battery cell group 10.

[0117] By providing the first heat exchange element 20 and the third heat exchange element 40 , heat exchange with the battery cell group 10 can be achieved on both sides of the battery cell group 10 in the second direction, thereby increasing the heat exchange area and improving the heat exchange efficiency.

[0118] In some embodiments of the present application, the heat of the battery cell group 10 may be directly transferred to the first heat exchange element 20 and the third heat exchange element 40 .

[0119] In some embodiments of the present application, the heat of the battery cell group 10 can be transferred to the first heat exchange member 20 and the third heat exchange member 40 through a heat conductor (not shown). For example, a heat conductor can be provided between the battery cell group 10 and the first heat exchange member 20, and the heat of the battery cell group 10 is transferred to the first heat exchange member 20 through the heat conductor. For example, a heat conductor can be provided between the battery cell group 10 and the third heat exchange member 40, and the heat of the battery cell group 10 is transferred to the third heat exchange member 40 through the heat conductor.

[0120] In the present application, the first heat exchange element 20 has a first heat exchange channel for heat exchange medium to flow, and the third heat exchange element 40 has a third heat exchange channel for heat exchange medium to flow. At least two of the first heat exchange channel of the first heat exchange element 20, the second heat exchange channel of the second heat exchange element 30, and the third heat exchange channel of the third heat exchange element 40 are connected.

[0121] In some embodiments of the present application, the first heat exchange channel of the first heat exchange element 20 and the second heat exchange channel of the second heat exchange element 30 can be connected. Thus, the first heat exchange element 20 and the second heat exchange element 30 can share an inlet and an outlet for the heat exchange medium to flow in and out, thereby improving the heat exchange efficiency.

[0122] In addition, by providing the connecting piece 5, the heat exchange medium can flow into or out of the heat exchange flow channel of each heat exchange component through the connecting piece 5. Since the heat exchange medium is always in a flowing state, there is a constant supply of new heat exchange medium to exchange heat with the battery cell 1, which reduces the possibility of the heat exchange medium continuously exchanging heat with the battery cell 1 in a static state, thereby reducing the possibility of an unfavorable situation in which the heat exchange efficiency gradually decreases, such as the temperature of the heat exchange medium approaches the temperature of the battery cell 1 due to continuous heat exchange with the battery cell 1, thereby further improving the heat exchange efficiency and heat exchange reliability of the battery device 100.

[0123] In some embodiments of the present application, Figures 4 to 6 As shown, the battery device 100 may include a connecting piece 5, in which a connecting cavity is formed, and at least two of the first heat exchange channel, the second heat exchange channel, and the third heat exchange channel may be connected through the connecting cavity.

[0124] Exemplarily, the connecting piece 5 can be connected to the first heat exchange piece 20 and the second heat exchange piece 30 respectively, the first heat exchange channel and the second heat exchange channel can be connected through the connecting cavity of the connecting piece 5, and the liquid exchange medium can flow between the connecting cavity, the first heat exchange channel and the second heat exchange channel.

[0125] As another example, the connecting piece 5 can be connected to the second heat exchange piece 30 and the third heat exchange piece 40 respectively, the second heat exchange channel and the third heat exchange channel can be connected through the connecting cavity of the connecting piece 5, and the liquid exchange medium can flow between the connecting cavity, the second heat exchange channel and the third heat exchange channel.

[0126] As another example, the connecting piece 5 can be connected to the first heat exchange element 20 and the third heat exchange element 40 respectively, the first heat exchange channel and the third heat exchange channel can be connected through the connecting cavity of the connecting piece 5, and the liquid exchange medium can flow between the connecting cavity, the first heat exchange channel and the third heat exchange channel.

[0127] As another example, the connecting piece can respectively connect the first heat exchange element 20, the second heat exchange element 30 and the third heat exchange element 40, the first heat exchange channel, the second heat exchange channel and the third heat exchange channel can be connected through the connecting cavity of the connecting piece 5, and the liquid exchange medium can flow between the connecting cavity, the first heat exchange channel, the second heat exchange channel and the third heat exchange channel.

[0128] At least two heat exchangers are connected by a connecting piece, so that the heat exchange channels of the two heat exchangers are connected through the connecting cavity to realize the circulation of the heat exchange medium in the two heat exchangers. The connecting piece is provided to connect the two heat exchangers, and the manufacturing of the device can be completed by assembly in the production process stage, which is conducive to reducing the difficulty of the production process and saving production costs.

[0129] In some embodiments of the present application, the connecting member 5 can be provided as a pair, and the pair of connecting members 5 are arranged opposite to each other along the first direction, or the pair of connecting members 5 are arranged at intervals along the third direction. The first direction, the second direction, and the third direction are perpendicular to each other.

[0130] In the present application, a pair of connecting pieces 5 is provided, which is beneficial to further improve the circulation efficiency of the heat exchange medium, thereby improving the heat exchange efficiency.

[0131] like Figure 4 As shown, in the embodiment of the present application, a pair of connecting pieces 5 are arranged relatively along the third direction, that is, along the length direction of the battery cell 1. In this way, after the heat exchange medium flows into the heat exchange channel through one connecting piece 5, the heat exchange medium will flow through the battery cell 1 along the length direction of the battery cell 1 and then flow out of the heat exchange channel through another connecting piece 5, which is conducive to increasing the flow path of the heat exchange medium in the heat exchange channel, so that the heat exchange medium can flow through the entire heat exchange channel almost completely before flowing out, which is conducive to increasing the contact area between the heat exchange medium and the battery cell 1, thereby achieving a better heat exchange effect on the battery cell 1, and making the overall heat exchange of the battery device 100 more uniform and reliable.

[0132] Of course, those skilled in the art should understand that in some other embodiments, the number of connecting pieces 5 may be one or more (more than two), and the connecting piece 5 may be located at any other suitable position, which may be specifically arranged according to the size of the battery device 100 and the arrangement of the internal components, as long as the heat exchange channel connecting the heat exchange components can be realized.

[0133] For example, in some embodiments, a pair of connecting pieces 5 can be arranged relatively along the first direction respectively. In some embodiments, the connecting pieces 5 can be set to three or more. In some embodiments, a plurality of connecting pieces 5 can be arranged regularly in other directions. In some embodiments, a plurality of connecting pieces 5 can be arranged randomly and irregularly.

[0134] In some embodiments of the present application, Figures 4 to 6 As shown, the connecting member 5 may include a first connecting port 51, a second connecting port 52 and a third connecting port 53, the first connecting port 51 connects the first heat exchange flow channel with the connecting cavity, the second connecting port 52 connects the second heat exchange flow channel with the connecting cavity, and the third connecting port 53 of one connecting member 5 in a pair of connecting members 5 connects the liquid inlet pipeline with the connecting cavity, and the third connecting port 53 of the other connecting member 5 in a pair of connecting members 5 connects the liquid outlet pipeline with the connecting cavity. The heat exchange medium flows into the first heat exchange flow channel and the second heat exchange flow channel through the third connecting port 53 connected to the liquid inlet pipeline, and the heat exchange medium in the first heat exchange flow channel and the second heat exchange flow channel flows out through the third connecting port 53 connected to the liquid outlet pipeline.

[0135] The first heat exchange member 20 and the second heat exchange member 30 are connected via the connecting member 5 to achieve the circulation of the heat exchange medium in the first heat exchange member 20 and the second heat exchange member 30 . The heat exchange medium transported through the liquid inlet pipeline can flow into the connecting cavity of the connecting piece 5 through the third connecting port 53 of one of the pair of connecting pieces 5, and flow out of the first heat exchange channel and the second heat exchange channel respectively through the first connecting port 51 and the second connecting port 52 of the connecting piece 5. The heat exchange medium in the first heat exchange channel and the second heat exchange channel respectively flows into the connecting cavity of the connecting piece through the first connecting port 51 and the second connecting port 52 of the other connecting piece 5 in the pair of connecting pieces 5, and flows out to the liquid outlet pipeline through the third connecting port 53 of the connecting piece 5. Therefore, through a pair of connecting pieces 5, a liquid inlet pipeline and a liquid outlet pipeline, not only can the first heat exchange member 20 and the second heat exchange member 30 be connected to improve the heat exchange efficiency, but also the heat exchange medium can flow in and out through the third connecting port 53 to improve the circulation efficiency of the heat exchange medium, which is beneficial to further improve the heat exchange efficiency, and is also beneficial to reduce the number of components, reduce assembly difficulty, and reduce production costs.

[0136] It should be noted that the present application is not limited to the third connecting port 53 being connected to the liquid outlet pipeline and the liquid inlet pipeline. In some embodiments, the liquid outlet pipeline can be connected to the heat exchange channel of one heat exchange component, and the liquid inlet pipeline can be connected to the heat exchange channel of another heat exchange component. In some embodiments, the liquid outlet pipeline can be connected to the connecting cavity of the connecting member 5, and the liquid inlet pipeline can be connected to the heat exchange channel of one heat exchange component. In some embodiments, the liquid outlet pipeline can be connected to the heat exchange channel of one heat exchange component, and the liquid inlet pipeline can be connected to the connecting cavity of the connecting member 5. The specific setting can be based on the size of the battery device 100 and the arrangement of the internal components, as long as the heat exchange channel of the heat exchange component can be connected.

[0137] In some embodiments, Figure 7 As shown, the battery device 100 further includes a box 50, and the battery cell group 10 is accommodated in the box 50. The box 50 is formed with a liquid inlet 501 and a liquid outlet 502, and the liquid inlet pipeline and the liquid outlet pipeline can be connected to the liquid inlet 501 and the liquid outlet 502 respectively.

[0138] The battery cell group 10 is accommodated in the box body, and the box body 50 can protect the battery cell group 10. The box body 50 is provided with a liquid inlet 501 and a liquid outlet 502 respectively connected to the liquid inlet pipeline and the liquid outlet pipeline to facilitate the circulation of the heat exchange medium. In addition, since the heat exchange medium passes through the box body during the circulation process, the box body can also play a certain heat exchange role to improve the heat exchange effect.

[0139] Exemplarily, the liquid inlet 501 of the box 50 can be connected to the heat exchange medium supply structure outside the battery device 100, so that the heat exchange medium is supplied to each heat exchange component through the liquid inlet 501, the liquid inlet pipeline and the connecting piece 5. The liquid outlet 502 of the box 50 can be connected to the heat exchange medium recovery mechanism outside the battery device 100, so that the heat exchange medium flowing out of each heat exchange component is recovered through the liquid outlet 502, the liquid outlet pipeline and the connecting piece 5, so as to achieve good heat exchange and maintain the heat exchange stability of the battery device 100.

[0140] In addition, when two of the first heat exchanger 20, the second heat exchanger 30, and the third heat exchanger 40 are connected to each other, the two connected heat exchangers are connected to the liquid inlet and the liquid outlet respectively through the connecting piece 5 and a liquid inlet pipeline and a liquid outlet pipeline. At this time, the remaining separate heat exchangers will also be provided with additional liquid inlet pipelines and liquid outlet pipelines. In the embodiment of the present application, the liquid inlet pipelines and liquid outlet pipelines of the two connected heat exchangers and the liquid inlet pipelines and liquid outlet pipelines of the separate heat exchangers can be respectively connected near the liquid inlet and the liquid outlet. In this way, the inflow and outflow of the heat exchange medium in the three heat exchangers can be achieved only through one liquid inlet and one liquid outlet, which is conducive to reducing the number of components and saving production costs.

[0141] As an example, the box 50 may include a first box 50a and a second box 50b. The first box 50a and the second box 50b are buckled together to form a receiving space 510 inside the box 50 to accommodate the battery cell group 10. The closed here means covered or closed, which can be sealed or unsealed. The first box 50a can be a top cover or a bottom plate.

[0142] In some embodiments, the box 50 may be a part of the chassis structure of the vehicle 1000. For example, a portion of the box 50 may become at least a portion of the floor of the vehicle 1000, or a portion of the box 50 may become at least a portion of the cross beam and longitudinal beam of the vehicle 1000.

[0143] In the embodiment of the present application, the third heat exchange member 40 may be disposed at the bottom of the box body 50. For example, in the preparation process, the third heat exchange member 40 may be connected to the box body 50, or formed together with the box body 50. Alternatively, in the assembly process, the third heat exchange member 40 may be assembled with the bottom of the box body 50, and then assembled with other components.

[0144] In the present application, when the third heat exchanger 40 is disposed in the box 50, since the third heat exchanger 40 does not need to be connected to other heat exchangers, the space for the connection between the third heat exchanger 40 and other heat exchangers can be saved. Such a configuration can save space and realize the miniaturization of the battery device 100 on the one hand; on the other hand, the saved space can be used to install other components, such as a high-voltage distribution box.

[0145] In some embodiments, the number of second heat exchange elements 30 can be set to multiple, and the multiple second heat exchange elements 30 are arranged at intervals along the first direction, and the second heat exchange channels of the multiple second heat exchange elements 30 are connected through the tube cavity of the tube body 31, and the second connecting port 52 of the connecting element 5 connects the tube cavity and the connecting cavity.

[0146] The second heat exchanger 30 is provided in plurality, and can realize heat exchange of the plurality of battery cells 1 by respectively contacting the first shell wall 21 of the plurality of battery cells 1 in a battery cell group 10, and the heat exchange efficiency is higher. The plurality of second heat exchangers 30 are connected to each other through the tube cavity of the tube body 31, so that the heat exchange medium can flow through the plurality of second heat exchangers 30 to realize heat exchange. The tube cavity of the tube body 31 is connected to the connecting cavity through the second connecting port 52 of the connecting piece 5, so that after the plurality of second heat exchangers 30 are connected to each other, they only need to be connected to one connecting piece 5 to realize connection with other heat exchangers (for example, the first heat exchanger 20, the third heat exchanger 40), instead of each second heat exchanger 30 requiring a separate connecting piece 5 to realize connection with other heat exchangers, which is conducive to simplifying the process and saving space.

[0147] Illustratively, a plurality of second heat exchange elements 30 may be located between battery cells 1 adjacent to each other along the first direction.

[0148] As another example, the plurality of second heat exchange elements 30 may be located between the battery cells 1 and the inner wall of the box body 50 .

[0149] As another example, when the thickness of the battery cell 1 is small, every two adjacent battery cells 1 may share a second heat exchange member 30. It should be noted that in the present application, it is not limited to connecting the first heat exchange channel of the first heat exchange member 20 and the second heat exchange channel of the second heat exchange member 30. The heat exchange channels of other heat exchange members may also be connected.

[0150] In some embodiments of the present application, the connecting member 5 may include a first connecting port 51, a second connecting port 52, and a third connecting port 53, wherein the first connecting port 51 connects the third heat exchange channel with the connecting cavity, the second connecting port 52 connects the second heat exchange channel with the connecting cavity, and the third connecting port 53 of one connecting member 5 connects the liquid inlet pipeline with the connecting cavity, and the third connecting port 53 of another connecting member 5 connects the liquid outlet pipeline with the connecting cavity. The heat exchange medium flows into the second heat exchange channel and the third heat exchange channel through the third connecting port 53 connected with the liquid inlet pipeline, and the heat exchange medium in the second heat exchange channel and the third heat exchange channel flows out through the third connecting port 53 connected with the liquid outlet pipeline.

[0151] The second heat exchange element 30 and the third heat exchange element 40 are connected via the connecting element 5 to achieve the circulation of the heat exchange medium in the second heat exchange element 30 and the third heat exchange element 40 . The heat exchange medium transported through the liquid inlet pipeline can flow into the connecting cavity of the connecting piece 5 through the third connecting port 53 of one of the pair of connecting pieces 5, and flow out of the third heat exchange channel and the second heat exchange channel respectively through the first connecting port 51 and the second connecting port 52 of the connecting piece 5. The heat exchange medium in the third heat exchange channel and the second heat exchange channel respectively flows into the connecting cavity of the connecting piece through the first connecting port 51 and the second connecting port 52 of the other connecting piece 5 in the pair of connecting pieces 5, and flows out to the liquid outlet pipeline through the third connecting port 53 of the connecting piece 5. Therefore, through a pair of connecting pieces 5, a liquid inlet pipeline and a liquid outlet pipeline, not only can the second heat exchange element 30 and the third heat exchange element 40 be connected to improve the heat exchange efficiency, but also the heat exchange medium can flow in and out through the third connecting port 53 to improve the circulation efficiency of the heat exchange medium, which is beneficial to further improve the heat exchange efficiency, and is also beneficial to reduce the number of components, reduce assembly difficulty, and reduce production costs.

[0152] In some embodiments, the connecting member 5 may include a first connecting port 51, a second connecting port 52, and a third connecting port 53, wherein the first connecting port 51 connects the first heat exchange channel with the connecting cavity, the second connecting port 52 connects the third heat exchange channel with the connecting cavity, and the third connecting port 53 of one connecting member 5 connects the liquid inlet pipeline with the connecting cavity, and the third connecting port 53 of another connecting member 5 connects the liquid outlet pipeline with the connecting cavity. The heat exchange medium flows into the first heat exchange channel and the third heat exchange channel through the third connecting port 53 connected with the liquid inlet pipeline, and the heat exchange medium in the first heat exchange channel and the third heat exchange channel flows out through the third connecting port connected with the liquid outlet pipeline.

[0153] The first heat exchange element 20 and the third heat exchange element 40 are connected via the connecting element 5 to achieve the circulation of the heat exchange medium in the first heat exchange element 20 and the third heat exchange element 40 . The heat exchange medium transported through the liquid inlet pipeline can flow into the connecting cavity of the connecting piece 5 through the third connecting port 53 of one of the pair of connecting pieces 5, and flow out of the first heat exchange channel and the third heat exchange channel respectively through the first connecting port 51 and the second connecting port 52 of the connecting piece 5. The heat exchange medium in the first heat exchange channel and the third heat exchange channel respectively flows into the connecting cavity of the connecting piece through the first connecting port 51 and the second connecting port 52 of the other connecting piece 5 in the pair of connecting pieces 5, and flows out to the liquid outlet pipeline through the third connecting port 53 of the connecting piece 5. Therefore, through a pair of connecting pieces 5, a liquid inlet pipeline and a liquid outlet pipeline, not only can the first heat exchange element 20 and the third heat exchange element 40 be connected to improve the heat exchange efficiency, but also the heat exchange medium can flow in and out through the third connecting port to improve the circulation efficiency of the heat exchange medium, which is beneficial to further improve the heat exchange efficiency, and is also beneficial to reduce the number of components, reduce assembly difficulty, and reduce production costs.

[0154] In the present application, the heat exchange channels of two heat exchange elements are not limited to being connected. In some embodiments, the first heat exchange channel of the first heat exchange element 20, the second heat exchange channel of the second heat exchange element 30 and the third heat exchange channel of the third heat exchange element 40 are connected.

[0155] In some embodiments, the connecting member 5 may include a first connecting port 51, a second connecting port 52, a third connecting port 53 and a fourth connecting port (not shown), the first connecting port 51 connects the first heat exchange channel with the connecting cavity, the second connecting port 52 connects the second heat exchange channel with the connecting cavity, the fourth connecting port connects the third heat exchange channel with the connecting cavity, and the third connecting port 53 of one connecting member connects the liquid inlet pipeline with the connecting cavity, and the third connecting port 53 of another connecting member connects the liquid outlet pipeline with the connecting cavity. The heat exchange medium flows into the first heat exchange channel, the second heat exchange channel and the third heat exchange channel through the third connecting port 53 connected to the liquid inlet pipeline, and the heat exchange medium in the first heat exchange channel, the second heat exchange channel and the third heat exchange channel flows out through the third connecting port 53 connected to the liquid outlet pipeline.

[0156] The first heat exchange element 20 , the second heat exchange element 30 and the third heat exchange element 40 are connected through the connecting element 5 , so that the heat exchange medium can flow through the first heat exchange element 20 , the second heat exchange element 30 and the third heat exchange element 40 . The heat exchange medium transported via the liquid inlet pipeline can flow into the connecting cavity of the connecting piece 5 through the third connecting port 53 of one of the connecting pieces 5 in a pair of connecting pieces 5, and flow out of the first heat exchange channel, the second heat exchange channel and the third heat exchange channel respectively through the first connecting port, the second connecting port and the fourth connecting port of the connecting piece 5. The heat exchange medium in the first heat exchange channel, the second heat exchange channel and the third heat exchange channel respectively flows into the connecting cavity of the connecting piece through the first connecting port, the second connecting port and the fourth connecting port of the other connecting piece 5 in the pair of connecting pieces 5, and flows out to the liquid outlet pipeline through the third connecting port 53 of the connecting piece 5. Therefore, through a liquid inlet pipeline and a liquid outlet pipeline of a pair of connecting pieces 5, not only can the first heat exchange element 20, the second heat exchange element 30 and the third heat exchange element 40 be connected to improve the heat exchange efficiency, but also the heat exchange medium can flow in and out through the third connecting port to improve the circulation efficiency of the heat exchange medium, which is beneficial to further improve the heat exchange efficiency. In addition, the three heat exchange components are connected together through the connecting piece, which is conducive to saving space, reducing the number of parts, reducing assembly difficulty, and reducing production costs.

[0157] In some embodiments, Figure 3 and Figure 8 As shown, the battery cell 1 includes an electrode terminal 3, and the housing 2 also includes a second housing wall 22 arranged opposite to each other along the second direction, and the electrode terminal 3 can be arranged on the second housing wall 22. A portion of the second housing wall 22 is recessed toward the inside of the housing 2 in the second direction to form a recessed portion 4, and the electrode terminal 3 is arranged in the recessed portion 4.

[0158] In the embodiment of the present application, the shell wall includes a pair of second shell walls 22 arranged opposite to each other along the second direction. Sometimes, the second shell wall 22 can also be referred to as the top wall or bottom wall of the shell 2. Of course, those skilled in the art should understand that when the battery cell 1 is placed flat, that is, when the first shell wall 21 (that is, the large surface, the shell wall with the largest area) of the battery cell 1 is placed downward, the second shell wall 22 can also be referred to as the side wall of the shell 2. In the related art, the electrode terminal is usually protruded on the shell wall of the shell, so whether the multiple electrode terminals are formed on the same shell wall or on different shell walls, they will occupy a certain space along the protruding direction of the electrode terminal.

[0159] In the embodiment of the present application, the second shell wall 22 is recessed along the second direction toward the inside of the shell 2 to form a recessed portion 4, and the electrode terminal 3 is accommodated in the recessed portion 4, thereby reducing the space occupied by the electrode terminal 3 in the second direction, which is beneficial to improving the space utilization of the battery cell 1. Moreover, when the overall volume of the battery device 100 remains unchanged, the volume of the shell 2 of the battery cell 1 can be appropriately increased, so that more electrolyte and electrode assembly can be accommodated, which is beneficial to improving the energy density of the battery cell 1, and further to improving the energy density of the battery device 100.

[0160] Furthermore, since the electrode terminal 3 is disposed in the recessed portion 4 , the possibility of damage to the electrode terminal 3 due to external impact or vibration can be reduced, thereby facilitating the improvement of the reliability of the battery cell 1 .

[0161] The recessed portion 4 is a recessed structure with a certain depth and shape. Exemplarily, the recessed portion 4 can be a pit-shaped structure, such as a hemispherical pit, a truncated cone pit, a prism pit, a cubic pit, etc. Exemplarily, the recessed portion 4 can be in the shape of a groove. The recessed portion 4 can be a regular shape or an irregular shape.

[0162] Since the recessed portion 4 is formed at one end of the housing 2 along the third direction, the space reserved in the entire length direction of the battery cell 1 for arranging the electrode terminal 3 is saved, and the saved space can be used to arrange components such as the sampling assembly.

[0163] Of course, those skilled in the art should understand that in some other embodiments, the battery cell 1 may not be formed with a recessed portion.

[0164] In some embodiments, Figure 3 and Figure 8 As shown, the recessed portion 4 is located at one end of the housing 2 along the third direction, and the recessed portions 4 of each battery cell 1 of a battery cell group 10 are all located on the same side along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other. The battery device 100 further includes a sampling assembly (not shown), which is disposed on one side of the battery cell group 10 where the recessed portion is formed, or the sampling assembly is disposed at the end of the battery cell group 10 along the second direction, and the sampling assembly can be electrically connected to the electrode terminal 3 of each battery cell 1.

[0165] In the present application, since the recessed portion 4 is formed at one end of the housing 2 along the third direction, the space reserved in the entire length direction of the battery cell 1 for setting the electrode terminal 3 is saved, and the saved space can be used to arrange components such as the sampling assembly. In addition, the electrode terminal 3 does not occupy the space on both sides of the housing in the third direction, which improves the space utilization of the battery cell 1 and the battery device 100, thereby facilitating the improvement of the energy density of the battery device 100.

[0166] In addition, the battery device 100 includes a sampling component, which can collect information by electrically connecting to the electrode terminal 3 provided in the recessed portion 4. Exemplarily, the sampling component can send the collected information to the battery management system (BMS). In the embodiment of the present application, the recessed portions 4 of each battery cell 1 of a battery cell group 10 are all located on the same side along the third direction, so it is convenient for the sampling component to sample each battery cell 1 of the battery cell group 10 at the same time.

[0167] In some embodiments, when the sampling component is arranged on the side of the battery cell group 10 where the recessed portion 4 is formed along the second direction, the space saved by the battery cell 1 along the second direction can be fully utilized to arrange the sampling component, and there is no need to reserve additional arrangement space for the sampling component, thereby making the layout of various components in the battery device 100 more reasonable, which is beneficial to improving space utilization and further beneficial to improving the energy density of the battery device 100.

[0168] In some embodiments, the sampling assembly is disposed at the end of the battery cell group 10 along the second direction, so that the sampling assembly does not occupy the space in the second direction of the battery device 100. The recessed portion 4 can reduce the waste of space in the box 50 of the battery device 100 when the battery cells 1 are arranged, thereby improving the volume utilization of the battery device 100, so that the battery device 100 composed of the battery cells 1 has a higher energy density.

[0169] In some embodiments, Figure 4 , Figure 8 and Fig. 9 As shown, the battery device 100 includes a sampling assembly, the battery cell 1 includes an electrode terminal 3, the sampling assembly is electrically connected to the electrode terminal, and the first heat exchange member 20 is formed with an opening 23. In the projection plane perpendicular to the second direction, the projection of the sampling assembly falls within the projection range of the opening 23.

[0170] In the present application, in the projection plane perpendicular to the second direction, the projection of the sampling component and the projection of the opening 23 can be set to overlap each other, for example, the size of the sampling component and the size of the opening 23 can be the same. However, the present application is not limited thereto, and the size of the sampling component can be smaller than the size of the opening 23, or the size of the sampling component can be larger than the size of the opening 23.

[0171] Thus, the sampling component can collect information by being electrically connected to the electrode terminal 3 through the opening 23. Such a setting can increase the heat exchange area and improve the heat exchange efficiency while facilitating the sampling component to collect information. Moreover, the setting of the opening 23 can reduce the overall weight of the battery device 100, which is conducive to achieving lightweight battery device 100.

[0172] In this application, if Figure 3 and Figure 8 As shown, the housing 2 further includes second housing walls 22 arranged opposite to each other along the second direction. A portion of the second housing wall 22 is recessed toward the interior of the housing 2 along the second direction to form a recess 4 , and the electrode terminal 3 is disposed in the recess 4 .

[0173] like Figure 4 and Fig. 9 As shown, along the second direction, the sampling assembly is disposed on one side of the battery cell group 10 where the recess 4 is formed, so that the sampling assembly can be electrically connected to the electrode terminal disposed in the recess 4 through the opening 23 to collect information.

[0174] In the present application, the sampling assembly may include a sampling plate or a sampling harness, so that the battery cell group 10 can be sampled through the sampling plate or the sampling harness, etc. Different sampling assemblies can be selected according to different situations, which is conducive to improving the layout flexibility in the battery device 100.

[0175] Exemplarily, the sampling board includes, but is not limited to, a flexible printed circuit board (FPC), a flexible flat cable connect flexible die-cut circuit (FCC).

[0176] FPC is a printed circuit board made of polyimide or polyester film as a substrate. The weight of the flexible circuit board is relatively light, which can effectively reduce the volume and weight of the battery device 100, thereby achieving lightweight of the battery device 100, and the flexible circuit board has good flexibility, high reliability and long service life.

[0177] FCC is a signal acquisition component that is connected to FPC or FDC (Flexible Die-cutting Circuit) through a flexible flat cable (FFC).

[0178] In the present application, the opening 23 may be in a rectangular shape. However, the present application is not limited thereto, and in some embodiments, the shape of the opening 23 may be one or more of a circle, an ellipse, a triangle, a trapezoid, an arc, a wave, and other irregular shapes, as long as the sampling requirements can be met.

[0179] In some embodiments, Figure 3 and Figure 4 As shown, there are multiple battery cell groups 10, and the multiple battery cell groups 10 are arranged along the third direction. Along the third direction, the arrangement areas of the electrode terminals 3 of two adjacent battery cell groups 10 are arranged opposite to each other or opposite to each other. There are multiple openings 23, and the multiple openings 23 are arranged along the third direction.

[0180] In the present application, the shapes and sizes of the plurality of openings 23 may be the same or different, and the present application does not impose any specific limitation thereto.

[0181] Multiple battery cell groups 10 can be arranged along the third direction, which is beneficial to further increase the energy density of the battery device 100. The arrangement areas of the electrode terminals 3 of two adjacent battery cell groups 10 are arranged opposite to each other or opposite to each other, and the multiple openings 23 are arranged along the third direction, so that the sampling component can be electrically connected to the electrode terminals 3 of multiple battery cells 1 in at least one battery cell group 10 through one opening 23 to collect information.

[0182] In the embodiment where the electrode terminal 3 is disposed in the recessed portion 4, the recessed portion 4 can be considered to be the arrangement area of ​​the electrode terminal 3. Therefore, the recessed portions 4 of two adjacent battery cell groups 10 are disposed opposite to each other or opposite to each other, and the opening 23 is disposed along the third direction, so that the sampling component can be electrically connected to the electrode terminals 3 of multiple battery cells 1 in at least one battery cell group 10 through one opening 23 to collect information.

[0183] In some embodiments, Figure 3 , Figure 4 and Fig. 9 As shown, the arrangement areas of the electrode terminals 3 of two adjacent battery cell groups 10 along the third direction are arranged opposite to each other, and the arrangement areas of the electrode terminals 3 arranged opposite to each other jointly form the sampling areas A of the two adjacent battery cell groups 10. In the projection plane perpendicular to the second direction, the projections of the sampling areas A of the two adjacent battery cell groups 10 fall within the projection range of one opening 23.

[0184] Fig. 9 The dotted line in Schematically shows the sampling area A.

[0185] Thus, the sampling component can be electrically connected to the electrode terminals 3 of multiple battery cells 1 in two adjacent battery cell groups 10 through an opening 23 to collect information. Such a setting, on the one hand, can reduce the setting of the opening 23 to increase the area of ​​the first heat exchange member 20, thereby increasing the heat exchange area to improve the heat exchange efficiency. On the other hand, the information collection of multiple battery cells 1 in two adjacent battery cell groups 10 through an opening 23 is conducive to achieving the compactness of the internal structure of the battery device 100.

[0186] In the embodiment where the electrode terminal 3 is disposed in the recessed portion 4, the recessed portion 4 can be considered to be the arrangement area of ​​the electrode terminal 3. Thus, the electrode terminals 3 of two adjacent battery cell groups 10 along the third direction are arranged opposite to each other, and the electrode terminals 3 arranged opposite to each other jointly form the sampling area A of the two adjacent battery cell groups 10. Thus, the sampling component can be electrically connected to the electrode terminals 3 of multiple battery cells 1 in the two adjacent battery cell groups 10 through an opening 23 to collect information.

[0187] In some embodiments of the present application, the recessed portion 4 is configured to be continuous along the first direction, the second housing wall 22 includes a first section 211, a second section 212, and a third section 213 connected in sequence, along the second direction, the third section 213 is recessed toward the inside of the housing 2 relative to the first section 211, and the second section 212 and the third section 213 surround the recessed portion 4. The electrode terminal 3 is disposed in the third section 213.

[0188] Exemplarily, the first section 211 , the second section 212 and the third section 213 of the second shell wall 22 may be formed into an integrated structural component by stamping, bending or other processes.

[0189] As another example, the first section 211 and the second section 212 of the second housing wall 22 may be integrally formed, and formed into a split structure with the third section 213 and then assembled together, or the second section 212 and the third section 213 may be integrally formed, and formed into a split structure with the first section 211 and then assembled together, or the first section 211, the second section 212 and the third section 213 may all be formed into split structures and then assembled together. The assembly methods of the above split structures include, but are not limited to, bolt connection, welding, riveting, clamping or bonding, etc.

[0190] like Figure 7As shown, the first section 211 and the third section 213 of the second housing wall 22 extend along the third direction, the second section 212 extends along the second direction, and the second section 212 connects the first section 211 and the third section 213 .

[0191] Exemplarily, an orifice (not shown in the figure) is formed on the third section 213, and the electrode terminal 3 is inserted through the orifice and electrically connected to the electrode assembly inside the housing 2. For example, a seal may be provided between the orifice and the electrode terminal 3, so as to achieve a sealed fit between the electrode terminal 3 and the first housing wall 21.

[0192] In some embodiments, an insulating structure may be provided between the electrode terminal 3 and the third section 213 to insulate the electrode terminal 3 from the shell 2 , thereby reducing the possibility of adverse conditions such as short circuits in the battery cell 1 due to abnormal contact between the electrode terminal 3 and the shell 2 .

[0193] In the embodiment of the present application, the recessed portion 4 is configured to be through-going along the first direction. Therefore, when a plurality of battery cells 1 of a battery cell group 10 are arranged and stacked along the first direction, the recessed portions 4 of each battery cell 1 can be connected to each other, thereby facilitating electrical connection between the electrode terminals 3 of each battery cell 1 and an external conductive structure (for example, a busbar), thereby achieving electrical connection between each battery cell 1 in the battery cell group 10.

[0194] In some embodiments of the present application, a dimension of the second segment along the second direction is in a range from 3 mm (millimeter) to 10 mm.

[0195] In the present application, the dimension of the second section 212 along the second direction may also be referred to as the depth dimension of the recessed portion 4 .

[0196] Exemplarily, the dimension of the second section 212 along the second direction may be 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0197] Thus, the size of the second section 212 along the second direction is within a suitable range, which can reduce the internal space occupied by the shell 2 while ensuring that the recessed portion 4 has a sufficient size to accommodate the electrode terminal 3, thereby taking into account both the reliability and energy density of the battery cell 1.

[0198] In some embodiments of the present application, a dimension of the electrode terminal protruding from the third section along the second direction is in a range of 0.5 mm to 3 mm.

[0199] The electrode terminal 3 is arranged to protrude from the third section 213 along the second direction. In this way, the risk of short circuit leakage caused by the contact between the component electrically connected to the electrode terminal 3 and the housing 2 can be reduced.

[0200] Exemplarily, the dimension of the electrode terminal 3 protruding from the third section 213 along the second direction may be 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, etc.

[0201] As a result, the dimension of the electrode terminal 3 protruding from the third section 213 along the second direction is within a suitable range, so that the electrode terminal 3 does not exceed the recessed portion 4 along the second direction without affecting the electrical connection of the external conductive structure to the electrode terminal 3, thereby reducing the dimension of the battery cell 1 in the second direction, which is beneficial to improving the energy density of the battery cell 1.

[0202] In some embodiments of the present application, a dimension of the third segment along the third direction is in the range of 80 mm to 400 mm.

[0203] The dimension of the third section 213 along the third direction can also be referred to as the length dimension of the recess 4. It is understood that the dimension of the third section 213 along the third direction is equal to the difference between the dimension of the battery cell 1 along the third direction and the dimension of the first section 211 along the third direction.

[0204] Since the dimension of the third section 213 along the third direction is within a suitable range, the recessed portion 4 has enough space to accommodate the two electrode terminals 3, and the two electrode terminals 3 are not easily overlapped and short-circuited. In addition, the internal space occupied by the housing 2 can be reduced, and the reliability and energy density of the battery cell 1 are taken into account.

[0205] Exemplarily, the dimension of the third section 213 along the third direction may be 80 mm, 100 mm, 120 mm, 140 mm, 160 mm, 180 mm, 200 mm, 220 mm, 240 mm, 260 mm, 280 mm, 300 mm, 320 mm, 340 mm, 360 mm, 400 mm, etc.

[0206] In some embodiments of the present application, the dimension of the battery cell 1 along the first direction is in the range of 10mm to 35mm; and / or the dimension of the battery cell along the second direction is in the range of 80mm to 130mm; and / or the dimension of the battery cell along the third direction is in the range of 300mm to 1300mm.

[0207] Therefore, the battery cell 1 is a blade battery, which has the advantages of high efficiency, high safety and low cost. Moreover, the design of the blade battery can make more full use of the space in the box 50 of the battery device 100, so that the box 50 of the battery device 100 can store more energy under the same volume, which is conducive to improving the energy density of the battery device 100.

[0208] The battery cell 1 of the embodiment of the present application is formed with a recessed portion 4, which is a special blade battery structure. While taking into account the advantages of traditional blade batteries, it is also beneficial to reduce the space occupied by the electrode terminal 3 in the second direction, thereby facilitating the improvement of the space utilization of the battery cell 1, and further facilitating the improvement of the energy density of the battery cell 1.

[0209] Exemplarily, the size of the battery cell 1 along the first direction may be 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, etc. The size of the battery cell 1 along the first direction may also be referred to as the thickness of the battery cell 1, that is, the thickness of the battery cell 1 may be the maximum size of the battery cell 1 along the first direction.

[0210] As another example, the size of the battery cell 1 along the second direction may be 80 mm, 85 mm, 90 mm, 95 mm, 100 mm, 105 mm, 110 mm, 115 mm, 120 mm, 120 mm, 130 mm, etc. The size of the battery cell 1 along the second direction may also be referred to as the height of the battery cell 1, that is, the height of the battery cell 1 may be the maximum size of the battery cell 1 along the second direction.

[0211] As another example, the size of the battery cell 1 along the third direction may be 300 mm, 400 mm, 500 mm, 600 mm, 700 mm, 800 mm, 900 mm, 1000 mm, 1100 mm, 1200 mm, 1300 mm, etc. The size of the battery cell 1 along the third direction may also be referred to as the length of the battery cell 1, that is, the length of the battery cell 1 may be the maximum size of the battery cell 1 along the third direction.

[0212] By designing the size of the battery cell 1 to satisfy the above relationship, it is beneficial to take into account both the energy density and the stacking efficiency of the battery cell 1 .

[0213] A second aspect of the present application provides an electrical device, which includes the battery device 100 of the first aspect of the present application for providing electrical energy.

[0214] Electrical devices include, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0215] Since the electrical device includes the battery device 100 provided in the first aspect of the embodiment of the present application, it is beneficial to increase the heat exchange area of ​​the electrical device, thereby improving the heat exchange efficiency.

[0216] A third aspect of the present application provides an energy storage device, which includes the battery device of the first aspect of the present application for storing electrical energy or providing electrical energy.

[0217] Since the energy storage device includes the battery device 100 provided in the first aspect of the embodiment of the present application, it is beneficial to increase the heat exchange area of ​​the energy storage device, thereby improving the heat exchange efficiency.

[0218] Specific examples of some embodiments of the present application are described below with reference to the accompanying drawings.

[0219] In one embodiment, the battery device 100 includes a battery cell group 10, a first heat exchange member 20, a second heat exchange member 30, a third heat exchange member 40 and a connecting member 5. The battery cell group 10 includes at least two battery cells 1 arranged along a first direction, and the battery cell 1 includes a shell 2, and the shell 2 includes a first shell wall 21 arranged oppositely along the first direction. The first heat exchange member 20 is arranged on the first side of the battery cell group along the second direction. The second heat exchange member 30 contacts the first shell wall 21 of the battery cell 1. The third heat exchange member 40 is arranged on the second side of the battery cell group 10 along the second direction, and the first side is arranged oppositely to the second side. A connecting cavity is formed in the connecting member 5, and the connecting member 5 can be connected to the first heat exchange member 20 and the second heat exchange member 30 respectively. The first heat exchange flow channel and the second heat exchange flow channel can be connected through the connecting cavity of the connecting member 5, and the liquid exchange medium can flow between the connecting cavity, the first heat exchange flow channel and the second heat exchange flow channel.

[0220] The connecting piece 5 may be provided in a pair, and the pair of connecting pieces 5 are arranged at intervals along the third direction. The connecting piece 5 may include a first connecting port 51, a second connecting port 52, and a third connecting port 53, the first connecting port 51 connects the first heat exchange flow channel with the connecting cavity, the second connecting port 52 connects the second heat exchange flow channel with the connecting cavity, and the third connecting port 53 of one connecting piece 5 in the pair of connecting pieces 5 connects the liquid inlet pipeline with the connecting cavity, and the third connecting port 53 of the other connecting piece 5 in the pair of connecting pieces 5 connects the liquid outlet pipeline with the connecting cavity. The heat exchange medium flows into the first heat exchange flow channel and the second heat exchange flow channel through the third connecting port 53 connected to the liquid inlet pipeline, and the heat exchange medium in the first heat exchange flow channel and the second heat exchange flow channel flows out through the third connecting port 53 connected to the liquid outlet pipeline.

[0221] The battery cell 1 includes an electrode terminal 3 , and the housing 2 further includes a second housing wall 22 arranged opposite to each other along a second direction. A portion of the second housing wall 22 is recessed toward the inside of the housing 2 along the second direction to form a recess 4 , and the electrode terminal 3 is disposed in the recess 4 .

[0222] The first heat exchange member 20 is formed with an opening 23 . In a projection plane perpendicular to the second direction, the projection of the sampling assembly falls within the projection range of the opening 23 .

[0223] In the embodiment of the present application, the third heat exchange element 40 is disposed at the bottom of the box body 50. During the assembly process, the third heat exchange element 40 may be assembled with the bottom of the box body 50, and then assembled with other components.

[0224] In the present application, a water-cooling plate (first heat exchanger 20) is added to the top of the battery cell (battery monomer group 10), and a three-way sleeve (connecting piece 5) is used to connect the top water-cooling plate (first heat exchanger 20) and the large-surface water-cooling plate (second heat exchanger 30) between the modules, and then the bottom water-cooling plate (third heat exchanger 40) on the lower box is used to cool the top, large surface and bottom of the battery cell at the same time, thereby improving the cooling rate of the battery cell.

[0225] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope required by the present application.

Claims

1. A battery device, characterized in that: include: A battery cell group, comprising at least two battery cells arranged along a first direction, wherein the battery cells include a housing and an electrode terminal, wherein the housing includes a first housing wall disposed opposite to each other along the first direction and a second housing wall disposed opposite to each other along a second direction, and the electrode terminal is disposed on the second housing wall; A first heat exchange member is disposed on a first side of the battery cell group along the second direction; a second heat exchange member in contact with the first housing wall of the battery cell; a third heat exchange member, disposed on a second side of the battery monomer group along the second direction, the first side being disposed opposite to the second side; Wherein, at least two of the first heat exchange channel of the first heat exchange element, the second heat exchange channel of the second heat exchange element and the third heat exchange channel of the third heat exchange element are connected, and the first direction is perpendicular to the second direction.

2. The battery device according to claim 1, characterized in that: The battery device includes a connecting piece, a connecting cavity is formed in the connecting piece, and at least two of the first heat exchange channel, the second heat exchange channel and the third heat exchange channel are connected through the connecting cavity.

3. The battery device according to claim 2, characterized in that: The connecting member is provided as a pair, and the pair of connecting members are arranged opposite to each other along the first direction, or the pair of connecting members are arranged at intervals along the third direction; The first direction, the second direction, and the third direction are perpendicular to each other.

4. The battery device according to claim 3, characterized in that: The connecting piece includes a first connecting port, a second connecting port and a third connecting port, the first connecting port connects the first heat exchange flow channel with the connecting cavity, the second connecting port connects the second heat exchange flow channel with the connecting cavity, and the third connecting port of one of the connecting pieces in a pair of the connecting pieces connects the liquid inlet pipeline with the connecting cavity, and the third connecting port of the other of the connecting pieces in a pair of the connecting pieces connects the liquid outlet pipeline with the connecting cavity; The heat exchange medium flows into the first heat exchange channel and the second heat exchange channel through the third communication port connected to the liquid inlet pipeline, and the heat exchange medium in the first heat exchange channel and the second heat exchange channel flows out through the third communication port connected to the liquid outlet pipeline.

5. The battery device according to claim 3, characterized in that: The connecting member includes a first connecting port, a second connecting port and a third connecting port, the first connecting port connects the third heat exchange flow channel with the connecting cavity, the second connecting port connects the second heat exchange flow channel with the connecting cavity, and the third connecting port of one connecting member connects the liquid inlet pipeline with the connecting cavity, and the third connecting port of another connecting member connects the liquid outlet pipeline with the connecting cavity; The heat exchange medium flows into the second heat exchange channel and the third heat exchange channel through the third communication port connected to the liquid inlet pipeline, and the heat exchange medium in the second heat exchange channel and the third heat exchange channel flows out through the third communication port connected to the liquid outlet pipeline.

6. The battery device according to claim 4 or 5, characterized in that: There are multiple second heat exchange members, which are arranged at intervals along the first direction, and the second heat exchange channels of the multiple second heat exchange members are connected through the tube cavity of the tube body, and the second connecting port of the connecting member connects the tube cavity and the connecting cavity.

7. The battery device according to claim 3, characterized in that: The connecting member includes a first connecting port, a second connecting port and a third connecting port, the first connecting port connects the first heat exchange channel with the connecting cavity, the second connecting port connects the third heat exchange channel with the connecting cavity, and the third connecting port of one connecting member connects the liquid inlet pipeline with the connecting cavity, and the third connecting port of another connecting member connects the liquid outlet pipeline with the connecting cavity; The heat exchange medium flows into the first heat exchange channel and the third heat exchange channel through the third communication port connected to the liquid inlet pipeline, and the heat exchange medium in the first heat exchange channel and the third heat exchange channel flows out through the third communication port connected to the liquid outlet pipeline.

8. The battery device according to claim 3, characterized in that: The connecting member includes a first connecting port, a second connecting port, a third connecting port and a fourth connecting port, the first connecting port connects the first heat exchange channel with the connecting cavity, the second connecting port connects the second heat exchange channel with the connecting cavity, the third connecting port connects the third heat exchange channel with the connecting cavity, and the fourth connecting port of one connecting member connects the liquid inlet pipeline with the connecting cavity, and the fourth connecting port of another connecting member connects the liquid outlet pipeline with the connecting cavity; The heat exchange medium flows into the first heat exchange channel, the second heat exchange channel and the third heat exchange channel through the fourth connecting port connected to the liquid inlet pipeline, and the heat exchange medium in the first heat exchange channel, the second heat exchange channel and the third heat exchange channel flows out through the fourth connecting port connected to the liquid outlet pipeline.

9. The battery device according to any one of claims 4, 5, 7 or 8, characterized in that: The battery device further comprises a box, in which the battery cell group is accommodated; The box body is formed with a liquid inlet and a liquid outlet, and the liquid inlet pipeline and the liquid outlet pipeline are communicated with the liquid inlet and the liquid outlet respectively.

10. The battery device according to claim 1, characterized in that: A portion of the second housing wall is recessed toward the interior of the housing along the second direction to form a recessed portion, and the electrode terminal is disposed in the recessed portion.

11. The battery device according to claim 10, characterized in that: The recessed portion is located at one end of the housing along the third direction, the recessed portions of the battery cells of one battery cell group are located on the same side along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other; The battery device further includes a sampling component, which is disposed on a side of the battery cell group where the recess is formed along the second direction, or is disposed at an end of the battery cell group along the second direction, and is electrically connected to the electrode terminals of each of the battery cells.

12. The battery device according to any one of claims 1 to 5, 10 and 11, characterized in that The battery device further includes a sampling assembly, the battery cell includes an electrode terminal, the sampling assembly is electrically connected to the electrode terminal, and the first heat exchange member is formed with an opening; In a projection plane perpendicular to the second direction, the projection of the sampling component falls within the projection range of the opening.

13. The battery device according to claim 12, characterized in that: There are multiple battery cell groups, and the multiple battery cell groups are arranged along a third direction. Along the third direction, the arrangement areas of the electrode terminals of two adjacent battery cell groups are arranged opposite to each other or opposite to each other, and the first direction, the second direction, and the third direction are perpendicular to each other; The number of the openings is plural, and the plurality of openings are arranged along the third direction.

14. The battery device according to claim 13, characterized in that: The arrangement areas of the electrode terminals of two adjacent battery cell groups along the third direction are arranged opposite to each other, and the arrangement areas of the electrode terminals arranged opposite to each other jointly form sampling areas of the two adjacent battery cell groups; In a projection plane perpendicular to the second direction, projections of the sampling areas of two adjacent battery cell groups fall within a projection range of one opening.

15. The battery device according to claim 11, characterized in that: The recessed portion is configured to penetrate along the first direction, the second shell wall includes a first section, a second section and a third section connected in sequence, along the second direction, the third section is recessed toward the inside of the shell relative to the first section, and the second section and the third section surround the recessed portion; The electrode terminal is disposed in the third section.

16. The battery device according to claim 15, characterized in that: A dimension of the second segment along the second direction is in a range from 3 mm to 10 mm.

17. The battery device according to claim 15, characterized in that: A dimension of the electrode terminal protruding from the third section along the second direction is in a range of 0.5 mm to 3 mm.

18. The battery device according to claim 15, characterized in that: A dimension of the third section along the third direction is in the range of 80 mm to 400 mm.

19. The battery device according to claim 15, characterized in that The dimension of the battery cell along the first direction is in the range of 10 mm to 35 mm; and / or The dimension of the battery cell along the second direction is in the range of 80 mm to 130 mm; and / or The dimension of the battery cell along the third direction is in the range of 300 mm to 1300 mm.

20. The battery device according to any one of claims 1 to 5, 7, 8, 10, 11, 13 to 19, characterized in that: The first shell wall is a shell wall with the largest area of ​​the shell.

21. An electrical device, characterized in that: The electrical device comprises the battery device according to any one of claims 1 to 20 for providing electrical energy.

22. An energy storage device, characterized in that: The energy storage device comprises the battery device according to any one of claims 1 to 20 for storing electrical energy or providing electrical energy.

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