Battery device and electric device

Abstract

The application discloses a battery device and a power utilization device. The battery device comprises a heat management assembly and a plurality of battery monomer assemblies, the heat management assembly is arranged on one side of the plurality of battery monomer assemblies along a third direction, the heat management assembly comprises a first end heat exchange plate part, a middle heat exchange plate part and a second end heat exchange plate part which are arranged at intervals along a first direction respectively, an internal part of the middle heat exchange plate part is formed with a middle heat exchange flow channel for flowing of a heat exchange medium, an internal part of the first end heat exchange plate part is formed with a first end heat exchange flow channel for flowing of the heat exchange medium, an internal part of the second end heat exchange plate part is formed with a second end heat exchange flow channel for flowing of the heat exchange medium, the middle heat exchange flow channel is communicated with the first end heat exchange flow channel and the second end heat exchange flow channel, the middle heat exchange flow channel is a bidirectional flow channel, the first end heat exchange flow channel and the second end heat exchange flow channel are unidirectional flow channels, the flowing directions of the heat exchange medium of the first end heat exchange flow channel and the second end heat exchange flow channel are opposite, and the energy density of the battery device can be improved.

Description

Technical Field

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

[0002] In recent years, with the rapid development of new energy technologies, new energy vehicles have been increasingly widely used and are gradually replacing traditional fuel vehicles, becoming one of the mainstream modes of transportation. As the power source of new energy vehicles, the power battery is one of their core components; therefore, the safety performance of the power battery has become a key focus of attention.

[0003] In the development of battery technology, improving the energy density of battery devices is a research direction. Utility Model Content

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

[0005] In a first aspect, embodiments of this application provide a battery device, which includes a thermal management component and a plurality of battery cell assemblies. The plurality of battery cell assemblies are arranged along a first direction, and each battery cell assembly includes a plurality of battery cells arranged along a second direction. The thermal management component is disposed on one side of the plurality of battery cell assemblies along a third direction and exchanges heat with the plurality of battery cell assemblies. The thermal management component includes a first end heat exchange plate portion, a middle heat exchange plate portion, and a second end heat exchange plate portion arranged at intervals along the first direction. The interior of the middle heat exchange plate portion is formed with a heat exchange... The intermediate heat exchange channel for the flow of the heat medium has a first-end heat exchange channel formed inside the first-end heat exchange plate portion and a second-end heat exchange channel formed inside the second-end heat exchange plate portion. The intermediate heat exchange channel connects the first-end heat exchange channel and the second-end heat exchange channel. The intermediate heat exchange channel is a bidirectional channel, while the first-end heat exchange channel and the second-end heat exchange channel are both unidirectional channels. The flow directions of the heat exchange medium in the first-end heat exchange channel and the second-end heat exchange channel are opposite. The first direction, the second direction, and the third direction are arranged to intersect each other.

[0006] In the above scheme, by having the first end heat exchange plate, the middle heat exchange plate, and the second end heat exchange plate arranged at intervals along the first direction simultaneously exchange heat with multiple battery cells, the heat exchange area of ​​the thermal management component can be increased, thus improving the heat exchange effect. By setting the middle heat exchange channel as a bidirectional channel, the heat exchange efficiency of the middle heat exchange plate when exchanging heat with the battery cells can be improved. By setting the first end heat exchange channel and the second end heat exchange channel as unidirectional channels with opposite flow directions of the heat exchange medium, it is convenient to connect the first end heat exchange channel and the second end heat exchange channel in series with the middle heat exchange channel, reducing the number of connecting pipes used to connect the first end heat exchange channel, the middle heat exchange channel, and the second heat exchange channel, simplifying the structure, saving internal space of the battery device, and thus improving the energy density of the battery device.

[0007] In some embodiments, the thermal management assembly further includes a connecting plate portion extending along a first direction; along a second direction, a first end heat exchange plate portion, a second end heat exchange plate portion, and an intermediate heat exchange plate portion are located on the same side of the connecting plate portion; the connecting plate portion includes a first flow channel and a second flow channel disposed adjacent to each other, the intermediate heat exchange plate portion includes an inlet flow channel and an outlet flow channel, the flow direction of the heat exchange medium in the inlet flow channel is away from the connecting plate portion, the flow direction of the heat exchange medium in the outlet flow channel is towards the connecting plate portion, the inlet flow channel is connected to the first flow channel, and the outlet flow channel is connected to the second flow channel.

[0008] In the above solution, by connecting the first end heat exchange plate, the second end heat exchange plate, and the intermediate heat exchange plate to the same side of the connecting plate, the structure can be further simplified, saving internal space of the battery device. Furthermore, by integrating adjacent first and second flow channels, the connecting plate handles the liquid supply and return for multiple intermediate heat exchange plates, eliminating the need for separate external inlet and outlet pipes for each intermediate heat exchange plate. Moreover, the adjacent arrangement of the first and second flow channels improves the integration of the thermal management components, simplifies the structure, and further enhances the energy density of the battery device.

[0009] In some embodiments, a liquid inlet is provided at the end of the first heat exchange plate portion away from the connecting plate portion, and the liquid inlet is connected to the first heat exchange channel; a liquid outlet is provided at the end of the second heat exchange plate portion away from the connecting plate portion, and the liquid outlet is connected to the second heat exchange channel.

[0010] In the above scheme, by setting an inlet and an outlet at the ends of the first heat exchange plate and the second heat exchange plate away from the connecting plate, a circulating heat exchange path can be formed through only one connecting plate, which further saves space in the battery device. Moreover, by reducing the connecting pipes, the flow path of the heat exchange medium can be shortened, heat loss can be reduced, and the heat exchange effect of the thermal management component can be further improved.

[0011] In some embodiments, the intermediate heat exchange plate portion further includes a connecting channel, one end of which is connected to the liquid inlet channel and the other end of which is connected to the liquid outlet channel.

[0012] In the above scheme, the inlet flow channel and the outlet flow channel are connected by connecting flow channels, realizing the series connection of the internal flow channels in the intermediate heat exchange plate section. There is no need for external pipelines to connect the inlet flow channel and the outlet flow channel, which simplifies the structure and further saves the internal space of the battery device.

[0013] In some embodiments, the intermediate heat exchange plate is provided with a first through hole and a second through hole, the first through hole being connected to the liquid inlet channel and the second through hole being connected to the liquid outlet channel; the connecting plate is provided with a first flow hole being connected to the first channel, the first flow hole and the first through hole being connected in a corresponding third direction; the connecting plate is also provided with a second flow hole being connected to the second channel, the second flow hole and the second through hole being connected in a corresponding third direction.

[0014] In the above solution, by setting the first through hole of the heat exchange plate and the flow hole of the connecting plate in a corresponding third direction, and the second through hole and the second flow hole in a corresponding third direction, it is convenient to connect the heat exchange plate and the connecting plate in a corresponding third direction. This not only saves external connectors and further saves internal space of the battery device, but also makes full use of the space on one side of the battery cell assembly in a corresponding third direction, without occupying the space along the first and second directions.

[0015] In some embodiments, the inlet channel and the outlet channel of the intermediate heat exchange plate are arranged sequentially along a first direction, and both the inlet channel and the outlet channel extend along a second direction. The extension length of the inlet channel along the second direction is L1, and the extension length of the outlet channel along the second direction is L2, wherein L1 > L2.

[0016] The above solution improves the temperature uniformity of the battery cell assembly in the second direction, thereby improving the consistency of the operating state of multiple battery cells and extending cycle life.

[0017] In some embodiments, the first flow channel and the second flow channel are arranged adjacent to each other along the second direction, and the second flow channel is closer to the intermediate heat exchange plate portion relative to the first flow channel along the second direction.

[0018] In the above solution, by arranging the first flow channel and the second flow channel adjacent to each other along the second direction, the size of the connecting plate portion along the second direction can be reduced, further saving internal space of the battery device. By placing the second flow channel closer to the middle heat exchange plate portion, it is easier to ensure that the length of the liquid outlet flow channel along the second direction is less than the length of the liquid inlet flow channel along the second direction.

[0019] In some embodiments, the inlet channel includes two inlet sub-channels, and the outlet channel includes two outlet sub-channels, with the two inlet sub-channels and the two outlet sub-channels corresponding and connected one-to-one.

[0020] In the above scheme, by connecting two liquid inlet channels and two liquid outlet channels in a one-to-one correspondence, the heat exchange area of ​​the intermediate heat exchange channel can be increased, thereby improving the stability of the battery cell module.

[0021] In some embodiments, the liquid inlet channel further includes a liquid inlet confluence channel, which is located between the first channel and the two liquid inlet sub-channels. The liquid inlet confluence channel is connected to the first channel, and the two liquid inlet sub-channels are respectively connected to the liquid inlet confluence channel.

[0022] In the above scheme, the two liquid inlet sub-channels are connected to the first channel through a liquid inlet confluence channel, which can uniformly distribute the heat exchange medium entering the two liquid inlet sub-channels, thereby improving the temperature uniformity of the battery cells.

[0023] In some embodiments, the liquid outlet channel further includes a liquid outlet confluence channel, which is located between the second channel and the two liquid outlet sub-channels. The liquid outlet confluence channel is connected to the second channel, and the two liquid outlet sub-channels are respectively connected to the liquid outlet confluence channel.

[0024] In the above scheme, by connecting two liquid outlet sub-channels and the second channel through one liquid outlet channel, the heat exchange medium can be smoothly merged from two paths into one, the pressure of the return heat exchange medium can be balanced, and the uniform heat exchange of the dual channels can be improved.

[0025] In some embodiments, there are multiple intermediate heat exchange plates, which are located between the first end heat exchange plate and the second end heat exchange plate, and are spaced apart along a first direction.

[0026] In the above scheme, by setting multiple intermediate heat exchange plates in the first direction, the heat exchange area of ​​the thermal management component can be increased, thereby further improving the heat exchange effect.

[0027] In some embodiments, multiple intermediate heat exchange channels are connected in parallel.

[0028] In the above scheme, by connecting multiple intermediate heat exchange channels in parallel, the path of each intermediate heat exchange channel can be shortened, heat loss can be reduced, thereby improving the temperature uniformity between battery cells and modules.

[0029] In some embodiments, the connecting plate portion includes a first flow channel and a second flow channel disposed adjacent to each other; the connecting plate portion is provided with a third flow hole communicating with the first flow channel, and the first end heat exchange plate portion is provided with a third through hole corresponding to the third flow hole; the connecting plate portion is also provided with a fourth flow hole communicating with the second flow channel, and the second end heat exchange plate portion is provided with a fourth through hole corresponding to the fourth flow hole.

[0030] In the above scheme, by setting the third through hole of the first end heat exchange plate part to correspond with the third flow hole of the connecting plate part, and setting the fourth through hole of the second end heat exchange plate part to correspond with the fourth flow hole of the connecting plate part, it is convenient for the first end heat exchange plate part and the second end heat exchange plate part to directly contact and connect with the connecting plate part respectively, which can save external connectors and further save internal space of the battery device.

[0031] In some embodiments, the first end heat exchange channel includes a plurality of first end heat exchange sub-channels arranged sequentially along the second direction, and each of the first end heat exchange sub-channels is connected to a third flow hole; the second end heat exchange channel includes a plurality of second end heat exchange sub-channels arranged sequentially along the second direction, and each of the second end heat exchange sub-channels is connected to a fourth flow hole.

[0032] In the above scheme, by connecting multiple first-end heat exchange sub-channels arranged along the second direction to a third flow hole, and connecting multiple second-end heat exchange sub-channels arranged along the second direction to a fourth flow hole, the heat exchange area of ​​the first-end heat exchange plate and the second-end heat exchange plate along the second direction can be increased, the heat exchange effect can be improved, and the flow holes connecting each heat exchange sub-channel to the connecting plate can be saved, simplifying the structure.

[0033] In some embodiments, the intermediate heat exchange plate includes a sealing plate and a flow channel plate connected to each other. The flow channel plate is disposed on the side of the sealing plate away from the battery cell assembly. The flow channel plate protrudes to the side away from the sealing plate to form a protrusion, and an intermediate heat exchange flow channel is formed between the protrusion and the sealing plate.

[0034] In the above scheme, the interconnected sealing plates and flow channels form an intermediate heat exchange channel, which can reduce interference with individual battery cells and reduce the space occupied inside the battery device.

[0035] In some embodiments, the intermediate heat exchange channel includes two liquid inlet sub-channels; the protrusion includes two first protruding sub-parts spaced apart along a first direction, the two first protruding sub-parts forming two liquid inlet sub-channels with the sealing plate respectively; a first groove is provided between the two first protruding sub-parts, the side of the first groove facing the sealing plate is connected to the sealing plate.

[0036] In the above solution, the heat exchange area can be increased by setting the first protrusion and the first groove, as well as the structural strength and sealing performance of the intermediate heat exchange plate.

[0037] In some embodiments, the intermediate heat exchange channel includes two liquid outlet sub-channels; the protrusion includes two second protruding sub-parts spaced apart along a first direction, and the two second protruding sub-parts respectively form two liquid outlet sub-channels between the sealing plate; a second groove is provided between the two second protruding sub-parts, and the side of the second groove facing the sealing plate is connected to the sealing plate.

[0038] In the above solution, the heat exchange area can be increased, as well as the structural strength and sealing performance of the intermediate heat exchange plate, by setting the second protrusion and the second groove.

[0039] In some embodiments, the intermediate heat exchange channel includes two connecting sub-channels, each connecting sub-channel being connected to the liquid inlet sub-channel and the liquid outlet sub-channel respectively; the protrusion includes two third protruding sub-parts spaced apart along the second direction, the two third protruding sub-parts forming two connecting sub-channels with the sealing plate respectively; a third groove is provided between the two third protruding sub-parts, the side of the third groove facing the sealing plate being connected to the sealing plate.

[0040] In the above scheme, the setting of the third protruding part and the third groove can not only increase the heat exchange area, the structural strength and sealing performance of the middle heat exchange plate, but also improve the temperature uniformity of the heat exchange medium in the liquid inlet and liquid outlet channels.

[0041] In some embodiments, both the first end heat exchange plate portion and the second end heat exchange plate portion include a heat exchange shell and a partition rib. The partition rib is disposed inside the heat exchange shell. The first end heat exchange channel is divided into different first end heat exchange sub-channels by the partition rib, and the second end heat exchange channel is divided into different second end heat exchange sub-channels by the partition rib.

[0042] In the above scheme, by dividing the heat exchange channels of the first end heat exchange plate section and the second end heat exchange plate section into heat exchange sub-channels through the partition ribs, the conditions of unidirectional flow channels can be met, the flow rate of the heat exchange medium can be increased, and the heat exchange effect of the first end heat exchange plate section and the second end heat exchange plate section can be improved.

[0043] In some embodiments, the first end heat exchange plate portion and the second end heat exchange plate portion are both integrally formed structures.

[0044] In the above solution, the one-piece molded structure can improve the structural integrity and mechanical strength of the first and second heat exchange plates, enhance sealing performance, and reduce the risk of leakage of heat exchange medium.

[0045] In some embodiments, the thermal management assembly further includes a connecting plate portion, wherein the first end heat exchange plate portion and the second end heat exchange plate portion are respectively welded to the connecting plate portion.

[0046] In the above scheme, welding enables a high-strength connection between the heat exchange plates at the first and second ends and the connecting plate, forming a robust integral structure for the thermal management assembly with excellent shock and impact resistance. Compared to mechanical connections such as flanges and joints, welding is more compact, does not occupy additional space, and helps achieve high energy density in the battery device.

[0047] In some embodiments, the connecting plate portion is provided with a third flow hole and a fourth flow hole, the end of the first end heat exchange plate portion is inserted into the third flow hole, and the end of the second end heat exchange plate portion is inserted into the fourth flow hole.

[0048] In the above design, the insertion of the end of the second heat exchange plate into the fourth flow hole provides a clear installation positioning reference for the first and second heat exchange plates, enabling them to be quickly and accurately aligned when assembled with the connecting plate, thus improving assembly efficiency and precision. The insertion fit allows for more even stress distribution at the welded joint, resulting in a more reliable weld and further strengthening the sealing and connection.

[0049] In some embodiments, the battery cell includes a housing and electrode terminals. The electrode terminals are disposed on one side of the housing along a third direction. The first end heat exchange plate portion, the intermediate heat exchange plate portion, and the second end heat exchange plate portion are respectively spaced apart from the electrode terminals along a first direction.

[0050] The above solution can make full use of the space next to the electrode terminals without occupying other additional internal space of the battery device, thereby further improving the energy density of the battery device.

[0051] In some embodiments, the first end heat exchange plate portion, the middle heat exchange plate portion, and the second end heat exchange plate portion are respectively bonded to the outer casing on the side facing the battery cell assembly.

[0052] In the above solution, by directly bonding each heat exchange plate to the battery cell assembly, not only is the overall strength of the battery device improved, but space is also saved.

[0053] In some embodiments, the projection of the intermediate heat exchange plate portion along a third direction covers at least a portion of the adjacent battery cell assembly.

[0054] In the above solution, by covering at least part of the adjacent battery cells with the intermediate heat exchange plate, heat exchange can be carried out on the adjacent battery cells simultaneously, which simplifies the structure of the thermal management component and reduces the space occupied by the thermal management component inside the battery device without affecting the heat exchange effect, thereby further improving the space utilization rate inside the battery device.

[0055] In some embodiments, the intermediate heat exchange plate includes an inlet channel and an outlet channel, wherein the projection of the inlet channel in a third direction at least partially overlaps with the projection of one of the battery cell components in a third direction, and the projection of the outlet channel in a third direction at least partially overlaps with the projection of another battery cell component in a third direction.

[0056] In the above scheme, by having the inlet and outlet channels overlap with two adjacent battery cell modules, the temperature between the battery cell modules can be more uniform, enabling each battery cell module to maintain consistent operation and improving the cycle life of the battery device.

[0057] Secondly, embodiments of this application also provide an electrical device, including the aforementioned battery device, which is used to provide electrical energy.

[0058] The electrical device provided in this application embodiment has the same technical effect as the battery provided in the above embodiment, and will not be described again here. Attached Figure Description

[0059] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0060] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application; Figure 2 Exploded views of battery devices according to some embodiments of this application; Figure 3 This is a schematic diagram of the structure of a battery module according to some embodiments of this application; Figure 4 This is an exploded structural diagram of a battery cell according to some embodiments of this application; Figure 5 This is an exploded view of a battery device according to some embodiments of this application; Figure 6 This is a schematic diagram of the structure of a thermal management component according to some embodiments of this application; Figure 7 yes Figure 6 Enlarged diagram of section A in the middle; Figure 8 yes Figure 6 Enlarged schematic diagram of section B in the middle; Figure 9 This is a partial structural schematic diagram of the intermediate heat exchange plate portion in some embodiments of this application; Figure 10 This is a schematic diagram of the structure of the connecting plate portion according to some embodiments of this application; Figure 11 This is a schematic diagram of the structure of a thermal management component according to other embodiments of this application; Figure 12 yes Figure 11 Enlarged diagram of section C; Figure 13 This is a partially exploded schematic diagram of the thermal management components of some embodiments of this application; Figure 14 This is a partial structural schematic diagram of the first end heat exchange plate portion according to some embodiments of this application; Figure 15 This is a partial structural schematic diagram of the intermediate heat exchange plate portion in some other embodiments of this application; Figure 16 This is a side view of the first end heat exchange plate portion or the second end heat exchange plate portion according to some embodiments of this application; Figure 17 This is a side view of a battery device according to some embodiments of this application.

[0061] Explanation of reference numerals in the attached figures: 1000, Vehicle; 100, Battery Unit; 200, Controller; 300, Motor; 10, Top Cover; 20, Battery Cell; 21, End Cover; 22, Housing; 23, Electrode Assembly; 24, Outer Shell; 26, Electrode Terminal; 30, Box; 400, Battery Module; 40, Battery Cell Assembly; 50, Thermal Management Assembly; 51, First End Heat Exchange Plate; 511, First End Heat Exchange Channel; 512. Liquid inlet; 513. Third through hole; 514. First end heat exchange sub-channel; 515. Heat exchange shell; 516. Separating rib; 52. Intermediate heat exchange plate section; 521. Intermediate heat exchange channel; 522. Liquid inlet channel; 5221. Liquid inlet sub-channel; 5222. Liquid inlet confluence channel; 523. Liquid outlet channel; 5231. Liquid outlet sub-channel; 5232. Liquid outlet confluence channel; 524. Connection Flow channel; 525, First through hole; 526, Second through hole; 527, Sealing plate; 528, Flow channel plate; 5281, Protrusion; 5282, First protruding sub-part; 5283, First groove; 5284, Second protruding sub-part; 5285, Second groove; 5286, Third protruding sub-part; 5287, Connecting sub-flow channel; 5288, Third groove; 53, Second end heat exchange plate part; 531, Second end heat exchange flow channel; 532, Liquid outlet; 533, Fourth through hole; 534, Second end heat exchange sub-flow channel; 60, Connecting plate part; 61, First flow channel; 62, Second flow channel; 63, First flow hole; 64, Second flow hole; 65, Third flow hole; 66, Fourth flow hole; 67, First connecting pipe; 68, Second connecting pipe; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0062] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0063] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0064] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0065] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0066] In this application, "multiple" means two or more (including two).

[0067] In this application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0068] The battery mentioned in the embodiments of this application may be a single physical module comprising one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or mixed via a busbar.

[0069] In some embodiments, the battery can be a battery module; when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0070] In some embodiments, the battery can be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.

[0071] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0072] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0073] A single battery cell typically includes an electrode assembly. The electrode assembly comprises a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0074] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0075] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0076] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be made of silver-treated stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0077] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more.

[0078] In some embodiments, the positive electrode can be made of foamed carbon or foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or a foamed alloy, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal may also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0079] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0080] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, silver-surfaced stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium can be used. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0081] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0082] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0083] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc.

[0084] In some embodiments, the negative electrode can be made of foamed carbon or foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or foamed alloy, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not have a negative electrode active material.

[0085] As an example, lithium source material, potassium metal or sodium metal may also be filled or deposited in the negative electrode current collector, wherein the lithium source material is lithium metal and / or lithium-rich material.

[0086] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0087] In some embodiments, the electrode assembly further includes a separator disposed between the positive and negative electrodes. This application does not impose any particular limitation on the type of separator; any known porous separator with good chemical and mechanical stability can be selected.

[0088] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride, and ceramic.

[0089] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0090] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0091] In some implementations, the electrode assembly is a stacked structure.

[0092] Multiple positive and negative electrodes can be set separately, and multiple positive and multiple negative electrodes can be stacked alternately.

[0093] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0094] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0095] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0096] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0097] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0098] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0099] The battery device includes a thermal management component that exchanges heat between individual battery cells, ensuring they operate at suitable temperatures. Existing thermal management components typically consist of multiple water-cooled plates connected by numerous water-cooling pipes, allowing coolant flow between them. This complex piping system, with its numerous joints, consumes significant internal space, reducing space utilization and ultimately lowering the battery's energy density.

[0100] To address the aforementioned technical problems, this application provides a battery cell where a first end heat exchange plate, a middle heat exchange plate, and a second end heat exchange plate, arranged at intervals along a first direction, simultaneously exchange heat with multiple battery cell components. This increases the heat exchange area of ​​the thermal management component and improves the heat exchange effect. By setting the middle heat exchange channel as a bidirectional channel, the heat exchange efficiency of the middle heat exchange plate when exchanging heat with the battery cell components can be improved. By setting the first end heat exchange channel and the second end heat exchange channel as unidirectional channels with opposite flow directions of the heat exchange medium, it is convenient to connect the first end heat exchange channel and the second end heat exchange channel in series with the middle heat exchange channel, reducing the number of connecting pipes used to connect the first end heat exchange channel, the middle heat exchange channel, and the second heat exchange channel. This simplifies the structure, saves internal space in the battery device, and thus improves the energy density of the battery device.

[0101] The technical solutions described in the embodiments of this application are applicable to electrode assemblies, battery cells including electrode elements, batteries including battery cells, and electrical devices using batteries.

[0102] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0103] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0104] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0105] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0106] Please refer to Figure 2 , Figure 2 This is an exploded view of the apparatus provided in some embodiments of this application. The battery device 100 includes a battery housing and battery cells 20. In some embodiments, the battery housing may include a top cover 10 and a housing 30, with the top cover 10 and housing 30 covering each other, and the top cover 10 and housing 30 together defining a receiving cavity for receiving the battery cells 20. The housing 30 may be a hollow structure with one end open, and the top cover 10 may be a plate-like structure, with the top cover 10 covering the open side of the housing 30 so that the top cover 10 and housing 30 together define the receiving cavity; the top cover 10 and housing 30 may also be hollow structures with one side open, with the open side of the top cover 10 covering the open side of the housing 30. Of course, the battery housing formed by the top cover 10 and housing 30 can be of various shapes, such as a cylinder, a cuboid, etc.

[0107] Figure 3 This is a schematic diagram of the structure of a battery module according to some embodiments of this application. In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of multiple battery cells 20 is housed in a housing. Of course, the battery device 100 can also be in the form of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form a battery module 400, and then multiple battery modules 400 are connected in series, parallel, or in a mixed manner to form a whole and housed in a housing. The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component for realizing the electrical connection between multiple battery cells 20.

[0108] Each battery cell 20 can be a secondary battery cell or a primary battery cell; it can also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0109] Figure 4 This is an exploded structural diagram of a battery cell according to some embodiments of this application. The end cap 21 is a component that covers the opening of the housing 22 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 21 can be adapted to the shape of the housing 22 to fit it. Optionally, the end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 21 is less prone to deformation under pressure and impact, enabling the battery cell 20 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 26 can be provided on the end cap 21. The electrode terminals 26 can be used to electrically connect to the electrode assembly 23 for outputting or inputting electrical energy into the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application does not impose special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 21. The insulating element can be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0110] Figure 5 This is an exploded view of a battery device according to some embodiments of this application.

[0111] like Figure 5As shown, in a first aspect, embodiments of this application provide a battery device 100, which includes a thermal management component 50 and a plurality of battery cell assemblies 40. The plurality of battery cell assemblies 40 are arranged along a first direction X, and each battery cell assembly 40 includes a plurality of battery cells 20 arranged along a second direction Y. The thermal management component 50 is disposed on one side of the plurality of battery cell assemblies 40 along a third direction Z and exchanges heat with the plurality of battery cell assemblies 40. The thermal management component 50 includes a first end heat exchange plate portion 51, an intermediate heat exchange plate portion 52 and a second end heat exchange plate portion 53 arranged at intervals along the first direction X. The interior of the intermediate heat exchange plate portion 52 is formed for heat exchange. The intermediate heat exchange channel 521 for medium flow has a first-end heat exchange channel 511 for heat exchange medium flow inside the first-end heat exchange plate portion 51, and a second-end heat exchange channel 531 for heat exchange medium flow inside the second-end heat exchange plate portion 53. The intermediate heat exchange channel 521 connects the first-end heat exchange channel 511 and the second-end heat exchange channel 531. The intermediate heat exchange channel 521 is a bidirectional channel, while the first-end heat exchange channel 511 and the second-end heat exchange channel 531 are both unidirectional channels. The flow directions of the heat exchange medium in the first-end heat exchange channel 511 and the second-end heat exchange channel 531 are opposite. The first direction X, the second direction Y, and the third direction Z are arranged to intersect each other.

[0112] The first direction X can be the width direction of the battery cell 20, the second direction Y is the thickness direction of the battery cell 20, and the third direction Z is the height direction of the battery cell 20. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0113] The battery device 100 includes more than one battery cell assembly 40, which are arranged sequentially along the first direction X. Because the capacity of a single battery cell assembly 40 is limited, arranging multiple battery cell assemblies 40 along the first direction X can further increase the total voltage and total capacity of the entire battery device 100 through the connection of series plates, thus meeting the high power and long range requirements of electrical devices such as new energy vehicles.

[0114] The first end heat exchange plate 51, the middle heat exchange plate 52, and the second end heat exchange plate 53 can extend along the second direction Y, respectively. Their projection along the third direction Z can cover all the battery cells 20 of the multiple battery cell assembly 40, so that all the battery cells 20 of the multiple battery cell assembly 40 can contact the heat exchange components, thereby ensuring the temperature consistency of all the battery cells 20 of the battery cell assembly 40 to a certain extent. Alternatively, they can cover some of the battery cells 20 of the multiple battery cell assembly 40.

[0115] The first heat exchange plate portion 51, the intermediate heat exchange plate portion 52, and the second heat exchange plate portion 53 are disposed on one side of the battery cell assembly 40 along the third direction Z. For example, the first heat exchange plate portion 51, the intermediate heat exchange plate portion 52, and the second heat exchange plate portion 53 are disposed on the top of the battery cell assembly 40 or on the bottom of the battery cell assembly 40. The first heat exchange plate portion 51, the intermediate heat exchange plate portion 52, and the second heat exchange plate portion 53 can be disposed on the side of the battery cell 20 with the electrode terminal 26, and disposed beside the electrode terminal 26. The first heat exchange plate portion 51, the intermediate heat exchange plate portion 52, and the second heat exchange plate portion 53 are disposed respectively in the gap space between the electrode terminal 26 and the housing 30, without occupying any additional space.

[0116] Heat exchange media flow through the first heat exchange channel 511, the second heat exchange channel 531, and the intermediate heat exchange channel 521. The heat exchange media can include ethylene glycol, water, or silicone oil, etc. Depending on the ambient temperature, the heat exchange media can be used to cool or heat the battery cell 20. For example, when the vehicle is traveling at high speed (1000 km / h) or the battery device is charging and discharging at a high rate (100 km / h), the battery cell 20 generates a large amount of heat. The low-temperature heat exchange media circulates in the heat exchange channels, transferring the heat away, which can, to some extent, prevent the battery cell 20 from overheating, thereby extending the battery cell 20's lifespan. When the ambient temperature is very low, the battery cell 20 can be heated using a heated heat exchange media to ensure that the battery cell 20 operates at a suitable temperature.

[0117] The intermediate heat exchange plate portion 52 is located between the first end heat exchange plate portion 51 and the second end heat exchange plate portion 53. The first end heat exchange plate portion 51 is the outermost first heat exchange plate portion arranged along the first direction X, for example, the leftmost one. The second end heat exchange plate portion 53 is the outermost last heat exchange plate portion arranged along the first direction X, for example, the rightmost one.

[0118] The intermediate heat exchange plate section 52 has an intermediate heat exchange channel 521 that is a bidirectional channel, that is, it has two channels with opposite flow directions of heat exchange medium, such as an inlet channel 522 and an outlet channel 523. There can be multiple intermediate heat exchange plate sections 52, which are arranged at intervals along the first direction X. The multiple intermediate heat exchange plate sections 52 can be connected in parallel or in series.

[0119] The heat exchange medium can flow in from the first heat exchange channel 511, then through the middle heat exchange channel 521, and finally out through the second heat exchange channel 531. The first heat exchange channel 511 and the second heat exchange channel 531 are connected in series with the middle heat exchange channel 521.

[0120] In the above scheme, by having the first end heat exchange plate portion 51, the middle heat exchange plate portion 52, and the second end heat exchange plate portion 53 arranged at intervals along the first direction X to simultaneously exchange heat with multiple battery cell modules 40, the heat exchange area of ​​the thermal management component 50 can be increased, thereby improving the heat exchange effect. By setting the middle heat exchange channel 521 as a bidirectional channel, the heat exchange efficiency of the middle heat exchange plate portion 52 when exchanging heat with the battery cell module 40 can be improved. By setting the first end heat exchange channel 511 and the second end heat exchange channel 531 as unidirectional channels, and the flow direction of the heat exchange medium is opposite, it is convenient to connect the first end heat exchange channel 511 and the second end heat exchange channel 531 to the middle heat exchange channel 521 in series, thereby reducing the number of connecting pipes used to connect the first end heat exchange channel 511, the middle heat exchange channel 521 and the second heat exchange channel, simplifying the structure, saving internal space of the battery device 100, and thus improving the energy density of the battery device 100.

[0121] Figure 6 This is a schematic diagram of the structure of a thermal management component according to some embodiments of this application; Figure 7 yes Figure 6 Enlarged schematic diagram of part A in the middle.

[0122] Please refer to the following: Figure 6 and Figure 7 In some embodiments, the thermal management assembly 50 further includes a connecting plate portion 60 extending along a first direction X; along a second direction Y, a first end heat exchange plate portion 51, a second end heat exchange plate portion 53, and an intermediate heat exchange plate portion 52 are located on the same side of the connecting plate portion 60; the connecting plate portion 60 includes a first flow channel 61 and a second flow channel 62 arranged adjacent to each other, the intermediate heat exchange flow channel 521 includes an inlet flow channel 522 and an outlet flow channel 523, the flow direction of the heat exchange medium in the inlet flow channel 522 is away from the connecting plate portion 60, the flow direction of the heat exchange medium in the outlet flow channel 523 is towards the connecting plate portion 60, the inlet flow channel 522 is connected to the first flow channel 61, and the outlet flow channel 523 is connected to the second flow channel 62.

[0123] The connecting plate portion 60 may include a first connecting pipe 67 and a second connecting pipe 68 arranged sequentially adjacent to each other. A first flow channel 61 is formed inside the first connecting pipe 67, and a second flow channel 62 is formed inside the second connecting pipe 68. The first connecting pipe 67 and the second connecting pipe 68 share an intermediate plate, and the first flow channel 61 and the second flow channel 62 are separated by the intermediate plate so that the first flow channel 61 and the second flow channel 62 are not connected to each other.

[0124] The first flow channel 61 is used for liquid supply, conveying the low-temperature (during cooling) or high-temperature (during heating) heat exchange medium from the external system. The second flow channel 62 is used for liquid return, collecting the heat exchange medium that has completed heat exchange and flows back from each heat exchange plate section.

[0125] The connecting plate 60 is connected to the first end heat exchange channel 511, the middle heat exchange channel 521 and the second end heat exchange channel 531, and is used to transfer heat exchange medium to multiple heat exchange channels and to collect and merge the heat exchange medium.

[0126] The heat exchange medium pumped in by the external system first enters the first flow channel 61 of the connecting plate section 60. From the first flow channel 61, the heat exchange medium is distributed from the first flow channel 61 to the liquid inlet flow channel 522 of each intermediate heat exchange plate section 52. The heat exchange medium flows in the liquid inlet flow channel 522, and after the battery cell 20 absorbs or releases heat, it flows into the liquid outlet flow channel 523. The heat exchange medium flowing back from each intermediate heat exchange plate section 52 enters the second flow channel 62 of the connecting plate section 60 through its liquid outlet flow channel 523. All the heat exchange medium collects in the second flow channel 62 and finally flows out of the thermal management component 50, returning to the external heat exchanger (such as a condenser or heater) for cooling or heating, completing one cycle.

[0127] In the above solution, by connecting the first end heat exchange plate 51, the second end heat exchange plate 53, and the intermediate heat exchange plate 52 to the same side of the connecting plate 60, the structure can be further simplified and internal space of the battery device 100 can be saved. Moreover, by integrating adjacent first flow channels 61 and second flow channels 62, the connecting plate 60 undertakes the liquid supply and return of multiple intermediate heat exchange plate sections 52, eliminating the need to design independent external liquid inlet and return pipes for each intermediate heat exchange plate section 52. Furthermore, the adjacent arrangement of the first flow channel 61 and the second flow channel 62 improves the integration of the thermal management component 50, simplifies the structure, and can further improve the energy density of the battery device 100.

[0128] In some embodiments, the first heat exchange plate portion 51 is provided with a liquid inlet 512 at the end opposite to the connecting plate portion 60, and the liquid inlet 512 is connected to the first heat exchange channel 511; the second heat exchange plate portion 53 is provided with a liquid outlet 532 at the end opposite to the connecting plate portion 60, and the liquid outlet 532 is connected to the second heat exchange channel 531.

[0129] The inlet 512 and outlet 532 are located on the same side and opposite to the connecting plate 60, respectively. An inlet pipe is provided at the inlet 512 and an outlet pipe is provided at the outlet 532. The heat exchange medium enters from the inlet 512, flows into the first end heat exchange channel 511 of the first end heat exchange plate 51, and then flows into the connecting plate 60. The heat exchange medium flows through the connecting plate 60 into the inlet channels 522 of each intermediate heat exchange plate 52. The heat exchange medium flowing out from the outlet channels 523 of the intermediate heat exchange plate 52 flows into the connecting plate 60 and merges, finally entering the second end heat exchange plate 53 and flowing out to the outlet 532.

[0130] In the above scheme, by setting an inlet 512 and an outlet 532 at the ends of the first heat exchange plate 51 and the second heat exchange plate 53 away from the connecting plate 60, a circulating heat exchange path can be formed through only one connecting plate 60, which further saves space in the battery device 100. Moreover, by reducing the connecting pipes, the flow path of the heat exchange medium can be shortened, heat loss can be reduced, and the heat exchange effect of the thermal management component 50 can be further improved.

[0131] Figure 8 yes Figure 6 Enlarged schematic diagram of section B in the middle.

[0132] like Figure 8 As shown, in some embodiments, the intermediate heat exchange plate portion 52 further includes a connecting channel 524, one end of which is connected to the liquid inlet channel 522 and the other end is connected to the liquid outlet channel 523.

[0133] The inlet channel 522 and the outlet channel 523 can extend along the second direction Y, and the connecting channel 524 extends along the first direction X. The inlet channel 522, the connecting channel 524 and the outlet channel 523 are connected in sequence to form a U-shaped intermediate heat exchange channel 521.

[0134] In the above scheme, the inlet flow channel 522 and the outlet flow channel 523 are connected by the connecting flow channel 524, realizing the series connection of the internal flow channels in the intermediate heat exchange plate section 52. There is no need for external pipelines to connect the inlet flow channel 522 and the outlet flow channel 523, which simplifies the structure and further saves the internal space of the battery device 100.

[0135] Figure 9 This is a partial structural schematic diagram of the intermediate heat exchange plate portion in some embodiments of this application; Figure 10 This is a schematic diagram of the structure of the connecting plate portion according to some embodiments of this application.

[0136] Please see Figure 9 and Figure 10 In some embodiments, the intermediate heat exchange plate portion 52 is provided with a first through hole 525 and a second through hole 526. The first through hole 525 is connected to the liquid inlet channel 522, and the second through hole 526 is connected to the liquid outlet channel 523. The connecting plate portion 60 is provided with a first flow hole 63 connected to the first flow channel 61. The first flow hole 63 and the first through hole 525 are connected in a corresponding direction Z along the third direction. The connecting plate portion 60 is also provided with a second flow hole 64 connected to the second flow channel 62. The second flow hole 64 and the second through hole 526 are connected in a corresponding direction Z along the third direction.

[0137] A first flow passage 63 may be provided on the first connecting pipe 67, and a second flow passage 64 may be provided on the second connecting pipe 68. The first through hole 525 may be located above or below the first flow passage 63, and the second through hole 526 may be located above or below the second flow passage 64.

[0138] The first flow-through hole 63 and the first through hole 525 may have the same shape and size. The second flow-through hole 64 and the second through hole 526 may have the same shape and size. When assembling the intermediate heat exchange plate portion 52 to the connecting plate portion 60, the first flow-through hole 63 and the first through hole 525 may be aligned, and the second flow-through hole 64 and the second through hole 526 may be aligned. The connecting plate portion 60 along the periphery of the first flow-through hole 63 and the intermediate heat exchange plate portion 52 along the periphery of the first through hole 525 may be connected by welding or bonding, and the connecting plate portion 60 along the periphery of the second flow-through hole 64 and the intermediate heat exchange plate portion 52 along the periphery of the second through hole 526 may be connected by welding or bonding, etc.

[0139] In the above solution, by setting the first through hole 525 of the heat exchange plate part and the flow hole of the connecting plate part 60 in the third direction Z, and the second through hole 526 in the second flow hole 64, it is convenient to connect the heat exchange plate part and the connecting plate part 60 in the third direction Z. This not only saves external connectors and further saves internal space of the battery device 100, but also makes full use of the space on the side of the battery cell assembly 40 in the third direction Z, without occupying the space along the first direction X and the second direction Y.

[0140] Figure 11 This is a schematic diagram of the structure of a thermal management component according to other embodiments of this application.

[0141] like Figure 11 As shown, in some embodiments, the liquid inlet channel 522 and the liquid outlet channel 523 of the intermediate heat exchange plate portion 52 are arranged sequentially along the first direction X, and both the liquid inlet channel 522 and the liquid outlet channel 523 extend along the second direction Y. The extension length of the liquid inlet channel 522 along the second direction Y is L1, and the extension length of the liquid outlet channel 523 along the second direction Y is L2, wherein L1 > L2.

[0142] The longer inlet channel 522 allows the low-temperature heat exchange medium to undergo a deeper heat exchange path in the high heat load region, fully absorbing heat and slowing down its temperature rise rate. Meanwhile, the shorter return path allows the heated heat exchange medium to quickly leave the heat exchange zone, reducing its thermal interference to the low-temperature region and lowering the axial temperature gradient caused by the process.

[0143] The above solution improves the temperature uniformity of the battery cell assembly 40 in the second direction Y, thereby improving the consistency of the operating state of multiple battery cells 20 and extending the cycle life.

[0144] In some embodiments, the first flow channel 61 and the second flow channel 62 are arranged adjacent to each other along the second direction Y, and the second flow channel 62 is closer to the intermediate heat exchange plate portion 52 along the second direction Y relative to the first flow channel 61.

[0145] The first flow hole 63 and the second flow hole 64 are offset along the second direction Y, and correspondingly, the first through hole 525 and the second through hole 526 are offset along the second direction Y.

[0146] In the above solution, by arranging the first flow channel 61 and the second flow channel 62 adjacent to each other along the second direction Y, the size of the connecting plate portion 60 along the second direction Y can be reduced, further saving internal space of the battery device 100. By arranging the second flow channel 62 closer to the intermediate heat exchange plate portion 52, it is easier to ensure that the length of the liquid outlet flow channel 523 along the second direction Y is less than the length of the liquid inlet flow channel 522 along the second direction Y.

[0147] Figure 12 yes Figure 11 Enlarged schematic diagram of section C.

[0148] like Figure 12 As shown, in some embodiments, the liquid inlet channel 522 includes two liquid inlet sub-channels 5221, and the liquid outlet channel 523 includes two liquid outlet sub-channels 5231. The two liquid inlet sub-channels 5221 and the two liquid outlet sub-channels 5231 are connected in a one-to-one correspondence.

[0149] The two inlet channels 5221 are independent of each other, and the two outlet channels 5231 are independent of each other.

[0150] The area of ​​heat exchange between the heat exchange channel and the battery cell 20 mainly depends on the contact area between the channel wall and the battery cell 20. Dividing a wide channel into two narrow channels may result in a similar total cross-sectional area, but the total perimeter of the channels will increase significantly. For example, a wide channel only has its top and bottom surfaces in effective contact with the battery cell 20. However, in two parallel narrow channels, in addition to the top and bottom surfaces, the wall plate separating the two channels also becomes a heat exchange surface, thus increasing the total effective heat exchange area.

[0151] In the above scheme, by connecting the two liquid inlet channels 5221 and the two liquid outlet channels 5231 in a one-to-one correspondence, the heat exchange area of ​​the intermediate heat exchange channel 521 can be increased, thereby improving the stability of the battery cell module 40.

[0152] In some embodiments, the liquid inlet channel 522 further includes a liquid inlet confluence channel 5222, which is located between the first channel 61 and two liquid inlet sub-channels 5221. The liquid inlet confluence channel 5222 is connected to the first channel 61, and the two liquid inlet sub-channels 5221 are respectively connected to the liquid inlet confluence channel 5222.

[0153] The heat exchange medium first enters the inlet confluence channel 5222 from the first flow channel 61, and then flows into the two inlet sub-flow channels 5221 respectively. The inlet confluence channel 5222 acts as a buffer chamber and a pressure stabilizing chamber, so that the flow velocity of the heat exchange medium from the first flow channel 61 is reduced and the pressure reaches equilibrium here, and then it is distributed to the two inlet sub-flow channels 5221 almost simultaneously and in equal amounts. The flow rate and pressure of the coolant flowing through the two sub-flow channels are basically the same, so that the cooling (or heating) intensity obtained by the battery cell assembly 40 in different regions in the first direction X is the same.

[0154] In the above scheme, the two liquid inlet sub-channels 5221 and the first channel 61 are connected by a liquid inlet confluence channel 5222, which can uniformly distribute the heat exchange medium entering the two liquid inlet sub-channels 5221, thereby improving the temperature uniformity of the battery cell 20.

[0155] In some embodiments, the liquid outlet channel 523 further includes a liquid outlet confluence channel 5232, which is located between the second channel 62 and two liquid outlet sub-channels 5231. The liquid outlet confluence channel 5232 is connected to the second channel 62, and the two liquid outlet sub-channels 5231 are respectively connected to the liquid outlet confluence channel 5232.

[0156] The liquid outlet confluence channel 5232 serves as a buffer chamber and a collection chamber, which can mix and balance the heat exchange medium that may have slight pressure fluctuations and flow back from the two liquid outlet sub-channels 5231. This reduces the eddies and large flow resistance generated by the direct collision of the two fluids, allowing the heat exchange medium to flow smoothly and with low pressure loss into the second channel 62 of the connecting plate 60.

[0157] The liquid outlet confluence channel 5232 ensures that the heat exchange medium flowing back from different areas of the battery cell assembly 40 is smoothly collected without causing disturbance due to uneven return flow.

[0158] In the above scheme, by connecting two liquid outlet sub-channels 5231 and the second channel 62 through a liquid outlet channel 523, the heat exchange medium can be smoothly merged from two paths into one, the pressure of the return heat exchange medium can be balanced, and the uniform heat exchange of the dual channels can be improved.

[0159] In some embodiments, there are multiple intermediate heat exchange plate portions 52, which are located between the first end heat exchange plate portion 51 and the second end heat exchange plate portion 53, and are spaced apart along the first direction X.

[0160] A central heat exchange plate 52 can be provided on one side of the battery cell assembly 40 along the third direction Z so that each battery cell assembly 40 can receive sufficient heat exchange.

[0161] In the above scheme, by setting multiple intermediate heat exchange plates 52 in the first direction X, the heat exchange area of ​​the thermal management component 50 can be increased, thereby further improving the heat exchange effect.

[0162] In some embodiments, a plurality of intermediate heat exchange channels 521 are connected in parallel.

[0163] The heat exchange medium in the first flow channel 61 sequentially enters the inlet flow channel 522 of multiple intermediate heat exchange channels 521, and then flows into the second flow channel 62 from the outlet flow channel 523 of each intermediate heat exchange channel 521. Instead of passing through each intermediate heat exchange channel 521 sequentially, the heat exchange medium in each intermediate heat exchange channel 521 flows simultaneously and in parallel.

[0164] In the above scheme, by connecting multiple intermediate heat exchange channels 521 in parallel, the path through each intermediate heat exchange channel 521 can be shortened, heat loss can be reduced, thereby improving the temperature uniformity between battery cell modules 40.

[0165] Figure 13 This is a partially exploded schematic diagram of the thermal management components of some embodiments of this application.

[0166] like Figure 13 As shown, in some embodiments, the connecting plate portion 60 includes a first flow channel 61 and a second flow channel 62 arranged adjacent to each other; the connecting plate portion 60 is provided with a third flow hole 65 communicating with the first flow channel 61, and the first end heat exchange plate portion 51 is provided with a third through hole 513 corresponding to the third flow hole 65; the connecting plate portion 60 is also provided with a fourth flow hole 66 communicating with the second flow channel 62, and the second end heat exchange plate portion 53 is provided with a fourth through hole 533 corresponding to the fourth flow hole 66.

[0167] The third flow hole 65 can be provided on the first connecting pipe 67 of the connecting plate part 60, and the fourth flow hole 66 can be provided on the second connecting pipe 68 of the connecting plate part 60.

[0168] The third flow-through hole 65 and the third through hole 513 can have the same or similar shape and size. When the connecting plate part 60 is assembled with the first end heat exchange plate part 51, the third flow-through hole 65 and the third through hole 513 are aligned, and a sealed connection can be achieved by welding, bonding or snap-fitting.

[0169] The fourth flow-through hole 66 and the fourth through hole 533 can have the same or similar shape and size. When the connecting plate part 60 and the second end heat exchange plate part 53 are assembled together, the fourth flow-through hole 66 and the fourth through hole 533 are aligned, and a sealed connection can be achieved by welding, bonding or snap-fitting.

[0170] In the above solution, by correspondingly setting the third through hole 513 of the first end heat exchange plate 51 to the third flow hole 65 of the connecting plate 60, and corresponding the fourth through hole 533 of the second end heat exchange plate 53 to the fourth flow hole 66 of the connecting plate 60, it is convenient for the first end heat exchange plate 51 and the second end heat exchange plate 53 to directly contact and connect with the connecting plate 60, which can save external connectors and further save internal space of the battery device 100.

[0171] Figure 14 This is a partial structural schematic diagram of the first end heat exchange plate portion in some embodiments of this application.

[0172] like Figure 14 As shown, in some embodiments, the first end heat exchange channel 511 includes a plurality of first end heat exchange sub-channels 514 arranged sequentially along the second direction Y, and each of the first end heat exchange sub-channels 514 is connected to the third flow hole 65; the second end heat exchange channel 531 includes a plurality of second end heat exchange sub-channels 534 arranged sequentially along the second direction Y, and each of the second end heat exchange sub-channels 534 is connected to the fourth flow hole 66.

[0173] When the heat exchange medium enters the first end heat exchange channel 511 from the first flow channel 61, it will enter each of the first end heat exchange sub-channels 514 respectively. When the heat exchange medium enters the second end heat exchange channel 531 from the second flow channel 62, it will enter each of the second end heat exchange sub-channels 534 respectively.

[0174] The cross-sectional area of ​​each of the first heat exchange sub-channels can be the same, and the cross-sectional area of ​​each of the second heat exchange sub-channels can be the same, so that the heat exchange medium can be evenly distributed into each sub-channel.

[0175] In the above scheme, by connecting multiple first-end heat exchange sub-channels 514 arranged along the second direction Y to a third flow hole 65, and connecting multiple second-end heat exchange sub-channels 534 arranged along the second direction Y to a fourth flow hole 66, the heat exchange area of ​​the first-end heat exchange plate portion 51 and the second-end heat exchange plate portion 53 along the second direction Y can be increased, thereby improving the heat exchange effect. In addition, the flow holes connecting each heat exchange sub-channel to the connecting plate portion 60 can be saved, thus simplifying the structure.

[0176] Figure 15 This is a partial structural schematic diagram of the intermediate heat exchange plate section in some other embodiments of this application.

[0177] like Figure 15 As shown, in some embodiments, the intermediate heat exchange plate portion 52 includes a sealing plate 527 and a flow channel plate 528 connected to each other. The flow channel plate 528 is disposed on the side of the sealing plate 527 away from the battery cell assembly 40. The flow channel plate 528 protrudes to the side away from the sealing plate 527 to form a protrusion 5281. An intermediate heat exchange flow channel 521 is formed between the protrusion 5281 and the sealing plate 527.

[0178] When sealing plate 527 is the plate closest to the battery cell 20, it can be a flat thin plate that directly contacts the surface of the battery cell 20. As the main heat transfer interface, it can efficiently conduct the heat generated by the battery cell 20 to the internal heat exchange medium, or transfer the temperature of the heat exchange medium to the battery cell 20.

[0179] The flow channel plate 528 is located on the side of the sealing plate 527 opposite to the battery cell 20, and can be processed with a protrusion 5281 by stamping or other forming processes. The part of the flow channel plate 528 excluding the protrusion 5281 can be parallel to the sealing plate 527 and connected to the sealing plate 527 by brazing or bonding, so that they form a sealed channel for the flow of heat exchange medium, namely the intermediate heat exchange flow channel 521.

[0180] The protrusion 5281 may extend along the second direction Y, or it may be curved or otherwise. The cross-section of the protrusion 5281 along the first direction X may be rectangular, semi-circular, elliptical, or otherwise.

[0181] In the above scheme, the intermediate heat exchange channel 521 is formed by the interconnected sealing plate 527 and flow channel plate 528, which can reduce interference with the battery cell 20 and reduce the space occupied inside the battery device 100.

[0182] In some embodiments, the intermediate heat exchange channel 521 includes two liquid inlet sub-channels 5221; the protrusion 5281 includes two first protruding sub-parts 5282 spaced apart along a first direction X, the two first protruding sub-parts 5282 forming two liquid inlet sub-channels 5221 between the two first protruding sub-parts 5282 and the sealing plate 527 respectively; a first groove 5283 is provided between the two first protruding sub-parts 5282, and the side of the first groove 5283 facing the sealing plate 527 is connected to the sealing plate 527.

[0183] Each first protruding sub-section 5282 resembles a flattened semi-circular or trapezoidal tube. When these protruding sub-sections of the flow channel plate 528 are connected to the flat sealing plate 527, two independent, tubular liquid inlet sub-channels 5221 are naturally formed between them. By machining two independent protruding sub-sections, two parallel coolant flow paths are directly created. The dual-channel design helps the coolant to be distributed more evenly to the surface of the battery cell 20.

[0184] The first groove 5283 is located between the two first protrusions 5282 and is a recessed area. The bottom of this recessed area (i.e., the side facing the sealing plate 527) is tightly connected to the sealing plate 527. The connection point between the first groove 5283 and the sealing plate 527 is equivalent to adding a strong reinforcing rib between the two side-by-side protrusions 5281.

[0185] The side of the first groove 5283 facing the sealing plate 527 can be parallel to the sealing plate 527, and can be connected and fixed to the sealing plate 527 by welding or bonding.

[0186] The connection between the first groove 5283 and the sealing plate 527 forms a reliable sealing weld line. This sealing line completely isolates the two liquid inlet channels 5221, ensuring the independence and normal operation of the dual-channel system.

[0187] In the above solution, the heat exchange area can be increased by setting the first protruding part 5282 and the first groove 5283, as well as the structural strength and sealing performance of the intermediate heat exchange plate part 52.

[0188] In some embodiments, the intermediate heat exchange channel 521 includes two liquid outlet sub-channels 5231; the protrusion 5281 includes two second protrusion sub-parts 5284 spaced apart along the first direction X, the two second protrusion sub-parts 5284 respectively forming two liquid outlet sub-channels 5231 between the two second protrusion sub-parts 5284 and the sealing plate 527; a second groove 5285 is provided between the two second protrusion sub-parts 5284, and the side of the second groove 5285 facing the sealing plate 527 is connected to the sealing plate 527.

[0189] Each second protruding sub-section 5284 resembles a flattened semi-circular or trapezoidal tube. When these protruding sub-sections of the flow channel plate 528 are connected to the flat sealing plate 527, two independent, tubular liquid outlet sub-channels 5231 are naturally formed between them. By machining two independent protruding sub-sections, two parallel coolant flow paths are directly created. The dual-channel design helps the coolant to be distributed more evenly to the surface of the battery cell 20.

[0190] The second groove 5285 is located between the two second protrusions 5284 and is a recessed area. The bottom of this recessed area (i.e., the side facing the sealing plate 527) is tightly connected to the sealing plate 527. The connection point between the second groove 5285 and the sealing plate 527 is equivalent to adding a strong reinforcing rib between the two side-by-side protrusions 5281.

[0191] The side of the second groove 5285 facing the sealing plate 527 can be parallel to the sealing plate 527, and can be connected and fixed to the sealing plate 527 by welding or bonding.

[0192] The connection between the second groove 5285 and the sealing plate 527 forms a reliable sealing weld line. This sealing line completely isolates the two liquid inlet channels 5221, ensuring the independence and normal operation of the dual-channel system.

[0193] In the above solution, the heat exchange area can be increased by setting the second protrusion 5281 and the second groove 5285, as well as the structural strength and sealing performance of the intermediate heat exchange plate 52.

[0194] In some embodiments, the intermediate heat exchange channel 521 includes two connecting sub-channels 5287, each connecting sub-channel 5287 being connected to the liquid inlet sub-channel 5221 and the liquid outlet sub-channel 5231 respectively; the protrusion 5281 includes two third protruding sub-parts 5286 spaced apart along the second direction Y, the two third protruding sub-parts 5286 forming two connecting sub-channels 5287 between the two third protruding sub-parts 5286 and the sealing plate 527 respectively; a third groove 5288 is provided between the two third protruding sub-parts 5286, the third groove 5288 being connected to the sealing plate 527 on the side facing the sealing plate 527.

[0195] The first protruding sub-part 5282 and the second protruding sub-part 5284 can extend along the second direction Y, respectively, and the third protruding sub-part 5286 can extend along the first direction X. Each third protruding sub-part 5286 is like a flattened semi-circular tube or trapezoidal tube. When these protruding sub-parts of the flow channel plate 528 are connected to the flat sealing plate 527, two independent, tubular connecting sub-flow channels 5287 are naturally formed between them. By processing two independent protruding sub-parts, two parallel coolant flow paths are directly created. The dual-flow channel design helps the coolant to be distributed more evenly to the surface of the battery cell 20.

[0196] The third groove 5288 is located between the two third protrusions 5286 and is a recessed area. The bottom of this recessed area (i.e., the side facing the sealing plate 527) is tightly connected to the sealing plate 527. The connection point between the third groove 5288 and the sealing plate 527 is equivalent to adding a strong reinforcing rib between the two side-by-side protrusions 5281.

[0197] The side of the third groove 5288 facing the sealing plate 527 can be parallel to the sealing plate 527, and can be connected and fixed to the sealing plate 527 by welding or bonding.

[0198] The connection between the third groove 5288 and the sealing plate 527 forms a reliable sealing weld line. This sealing line completely isolates the two connecting sub-channels 5287, ensuring the independence and normal operation of the dual-channel system.

[0199] In the above scheme, by setting the third protruding part 5286 and the third groove 5288, not only can the heat exchange area be increased, as well as the structural strength and sealing performance of the intermediate heat exchange plate part 52, but also the temperature uniformity of the heat exchange medium in the liquid inlet channel 5221 and the liquid outlet channel 5231 can be improved.

[0200] Figure 16 This is a side view of the first or second heat exchange plate portion in some embodiments of this application.

[0201] like Figure 16As shown, in some embodiments, both the first end heat exchange plate portion 51 and the second end heat exchange plate portion 53 include a heat exchange shell 515 and a partition rib 516. The partition rib 516 is disposed inside the heat exchange shell 515. The first end heat exchange channel 511 is divided into different first end heat exchange sub-channels 514 by the partition rib 516, and the second end heat exchange channel 531 is divided into different second end heat exchange sub-channels 534 by the partition rib 516.

[0202] The heat exchange shell 515 can be a one-piece structure prepared by extrusion or by injection molding. The partition ribs 516 extend along the second direction Y, as do the first-end heat exchange sub-channels 514 and 534. Multiple partition ribs 516 can be spaced apart along the first direction X, and multiple first-end heat exchange sub-channels 514 and multiple second-end heat exchange sub-channels 534 are arranged sequentially along the first direction X. The heat exchange medium in the multiple first-end heat exchange sub-channels 514 flows in the same direction, and is a unidirectional flow channel. The heat exchange medium in the multiple second-end heat exchange sub-channels 534 flows in the same direction, and is a unidirectional flow channel.

[0203] The arrangement of the heat exchange shell 515 and the partition rib 516 makes the first end heat exchange plate portion 51 and the second end heat exchange plate portion 53 similar to a harmonica tube. Multiple first end heat exchange sub-channels 514 and multiple second end heat exchange sub-channels 534 can flow heat exchange medium simultaneously, increasing the flow rate of heat exchange medium in the first end heat exchange plate portion 51 and the second end heat exchange plate portion 53.

[0204] In the above scheme, by dividing the heat exchange channels of the first end heat exchange plate portion 51 and the second end heat exchange plate portion 53 into heat exchange sub-channels through the partition rib 516, the conditions of unidirectional flow channel can be met, the flow rate of heat exchange medium can be increased, and the heat exchange effect of the first end heat exchange plate portion 51 and the second end heat exchange plate portion 53 can be improved.

[0205] In some embodiments, the first end heat exchange plate portion 51 and the second end heat exchange plate portion 53 are both integrally formed structures.

[0206] The first and second end heat exchange plate sections 53 are manufactured as a single component through a one-time manufacturing process (such as aluminum extrusion molding, precision casting, or integral machining). Their internal flow channels (such as multiple first / second end heat exchange sub-channels 534) are formed synchronously with the external structure during the molding process, rather than being assembled or welded from multiple parts. This one-piece molding structure means there are no internal welds or splicing interfaces, making the component itself a completely sealed whole.

[0207] In the above solution, the one-piece molded structure can improve the structural integrity and mechanical strength of the first heat exchange plate 51 and the second heat exchange plate 53, improve the sealing performance, and reduce the risk of leakage of the heat exchange medium.

[0208] In some embodiments, the thermal management assembly 50 further includes a connecting plate portion 60, wherein a first end heat exchange plate portion 51 and a second end heat exchange plate portion 53 are respectively welded to the connecting plate portion 60.

[0209] In the above scheme, welding can achieve a high-strength connection between the first and second end heat exchange plate sections 53 and the connecting plate section 60, making the thermal management assembly 50 a stable integral structure with good seismic and impact resistance. Compared with mechanical connection methods such as flanges and joints, welding connection is more compact, does not occupy extra space, and helps to achieve high energy density of battery device 100.

[0210] In some embodiments, the connecting plate portion 60 is provided with a third flow hole 65 and a fourth flow hole 66, the end of the first end heat exchange plate portion 51 is inserted into the third flow hole 65, and the end of the second end heat exchange plate portion 53 is inserted into the fourth flow hole 66.

[0211] The periphery of the end of the first heat exchange plate portion 51 can be welded or bonded to the periphery of the third flow hole 65, and the periphery of the end of the second heat exchange plate portion 53 can be welded or bonded to the periphery of the fourth flow hole 66.

[0212] In the above scheme, the design of inserting the end of the second heat exchange plate portion 53 into the fourth flow hole 66 provides a clear installation positioning reference for the first and second heat exchange plate portions 53, enabling them to be quickly and accurately aligned when assembled with the connecting plate portion 60, thus improving assembly efficiency and precision. The insertion fit allows for more uniform stress distribution at the welding points, forming a more reliable weld, further strengthening the sealing and connection.

[0213] Figure 17 This is a side view of a battery device according to some embodiments of this application.

[0214] like Figure 17 As shown, in some embodiments, the battery cell 20 includes a housing 24 and an electrode terminal 26. The electrode terminal 26 is disposed on one side of the housing 24 along the third direction Z. The first end heat exchange plate portion 51, the intermediate heat exchange plate portion 52 and the second end heat exchange plate portion 53 are respectively spaced apart from the electrode terminal 26 along the first direction X.

[0215] The outer casing 24 includes a housing 22 and an end cap 21 disposed at the opening of the housing 22.

[0216] The first end heat exchange plate portion 51, the intermediate heat exchange plate portion 52, and the second end heat exchange plate portion 53 are respectively located on the same side of the battery cell 20 as the electrode terminal 26. Both the positive electrode terminal 26 and the negative electrode terminal 26 are located on the side of the battery cell 20 along the third direction Z. The first end heat exchange plate portion 51, the intermediate heat exchange plate portion 52, or the second end heat exchange plate portion 53 can be provided at the end of the positive electrode terminal 26 away from the negative electrode terminal 26, or vice versa. In other words, the first end heat exchange plate portion 51, the intermediate heat exchange plate portion 52, or the second end heat exchange plate portion 53 can be provided at the end of the negative electrode terminal 26 away from the positive electrode terminal 26. That is, the first end heat exchange plate portion 51, the intermediate heat exchange plate portion 52, or the second end heat exchange plate portion 53 are provided on the outer side of the two electrode terminals 26, such that each heat exchange plate portion is located at the end of the battery cell 20 along the first direction X, and the first end heat exchange plate portion 51, the intermediate heat exchange plate portion 52, or the second end heat exchange plate portion 53 respectively cover the shoulder of the battery cell assembly 40. The electrode terminal 26 has a certain gap space with the top cover 10 of the housing 30 of the battery device 100 along the first direction X. The first end heat exchange plate 51, the middle heat exchange plate 52 or the second end heat exchange plate 53 can be set in this gap space without occupying additional internal space of the battery device 100.

[0217] The above solution can make full use of the space next to the electrode terminal 26 without occupying other additional internal space of the battery device 100, thereby further improving the energy density of the battery device 100.

[0218] In some embodiments, the first end heat exchange plate portion 51, the middle heat exchange plate portion 52, and the second end heat exchange plate portion 53 are respectively bonded to the housing 24 on the side facing the battery cell assembly 40.

[0219] In the above solution, by directly bonding each heat exchange plate to the battery cell assembly 40, not only is the overall strength of the battery device 100 improved, but space is also saved.

[0220] In some embodiments, the projection of the intermediate heat exchange plate portion 52 along the third direction Z covers at least a portion of the adjacent battery cell assembly 40, that is, the intermediate heat exchange plate covers the shoulders of two adjacent battery cell assemblies 40 respectively. For example, the projection of the intermediate heat exchange plate portion 52 along the third direction Z will simultaneously cover the right side region of the left battery cell assembly 40 and the left side region of the right battery cell assembly 40, in which case the intermediate heat exchange plate portion 52 can simultaneously contact two adjacent battery cell assemblies 40.

[0221] In the above scheme, by covering at least part of the adjacent battery cell assembly 40 with the intermediate heat exchange plate 52, heat exchange can be carried out on the adjacent battery cell assembly 40 at the same time, which simplifies the structure of the thermal management component 50. Without affecting the heat exchange effect, the space occupied by the thermal management component 50 inside the battery device 100 is reduced, and the space utilization rate inside the battery device 100 is further improved.

[0222] In some embodiments, the intermediate heat exchange plate portion 52 includes an inlet channel 522 and an outlet channel 523. The projection of the inlet channel 522 in the third direction Z at least partially overlaps with the projection of one of the battery cell components 40 in the third direction Z, and the projection of the outlet channel 523 in the third direction Z at least partially overlaps with the projection of another battery cell component 40 in the third direction Z.

[0223] In the above scheme, by having the liquid inlet channel 522 and the liquid outlet channel 523 overlap with two adjacent battery cell components 40 respectively, the temperature between the battery cell components 40 can be more uniform, so that each battery cell component 40 can maintain consistent operation and improve the cycle life of the battery device 100.

[0224] According to some embodiments of this application, this application provides a battery device 100, which includes a thermal management component 50 and a plurality of battery cell assemblies 40. The plurality of battery cell assemblies 40 are arranged along a first direction X, and each battery cell assembly 40 includes a plurality of battery cells 20 arranged along a second direction Y. The thermal management component 50 is disposed on one side of the plurality of battery cell assemblies 40 along a third direction Z and exchanges heat with the plurality of battery cell assemblies 40. The thermal management component 50 includes a first end heat exchange plate portion 51, a middle heat exchange plate portion 52 and a second end heat exchange plate portion 53 arranged at intervals along the first direction X. The interior of the middle heat exchange plate portion 52 is formed with a heat exchange... The intermediate heat exchange channel 521 for heat exchange medium flow has a first-end heat exchange channel 511 formed inside the first-end heat exchange plate portion 51 for heat exchange medium flow, and a second-end heat exchange channel 531 formed inside the second-end heat exchange plate portion 53 for heat exchange medium flow. The intermediate heat exchange channel 521 connects the first-end heat exchange channel 511 and the second-end heat exchange channel 531. The intermediate heat exchange channel 521 is a bidirectional channel, while the first-end heat exchange channel 511 and the second-end heat exchange channel 531 are both unidirectional channels. The flow directions of the heat exchange medium in the first-end heat exchange channel 511 and the second-end heat exchange channel 531 are opposite; wherein the first direction X, the second direction Y, and the third direction Z are intersecting each other. The first-end heat exchange plate portion 51, the intermediate heat exchange plate portion 52, and the second-end heat exchange plate portion 53 are respectively bonded to the outer casing 24 on the side facing the battery cell assembly 40.

[0225] Secondly, embodiments of this application also provide an electrical device, including the aforementioned battery device, which is used to provide electrical energy.

[0226] The battery device 100 provided according to the embodiments of this application includes the battery cell 20 provided in the embodiments. Since the battery device 100 provided in the embodiments of this application adopts the battery cell 20 provided in the above embodiments, it has the same technical effect, which will not be repeated here.

[0227] The electrical device provided according to the embodiments of this application includes the battery device 100 provided in the above embodiments, and the battery device 100 is used to provide electrical energy.

[0228] The power supply device provided according to the embodiments of this application has the same technical effect as the battery device 100 provided in the embodiments of this application, and will not be described again here.

[0229] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Multiple battery cell assemblies are arranged along a first direction, and each battery cell assembly includes multiple battery cells arranged along a second direction; A thermal management component is disposed on one side of the plurality of battery cell assemblies along a third direction and exchanges heat with the plurality of battery cell assemblies. The thermal management component includes a first end heat exchange plate, a middle heat exchange plate, and a second end heat exchange plate arranged at intervals along the first direction. The middle heat exchange plate has an internal intermediate heat exchange channel for the flow of heat exchange medium. The first end heat exchange plate has an internal first end heat exchange channel for the flow of heat exchange medium. The second end heat exchange plate has an internal second end heat exchange channel for the flow of heat exchange medium. The middle heat exchange channel connects the first end heat exchange channel and the second end heat exchange channel. The middle heat exchange channel is a bidirectional channel. The first end heat exchange channel and the second end heat exchange channel are both unidirectional channels. The flow directions of the heat exchange medium in the first end heat exchange channel and the second end heat exchange channel are opposite. The first direction, the second direction, and the third direction are intersecting each other.

2. The battery device according to claim 1, characterized in that, The thermal management assembly further includes a connecting plate portion extending along the first direction; along the second direction, the first end heat exchange plate portion, the second end heat exchange plate portion, and the intermediate heat exchange plate portion are located on the same side of the connecting plate portion. The connecting plate portion includes a first flow channel and a second flow channel arranged adjacent to each other. The intermediate heat exchange plate portion includes an inlet flow channel and an outlet flow channel. The flow direction of the heat exchange medium in the inlet flow channel is away from the connecting plate portion, and the flow direction of the heat exchange medium in the outlet flow channel is towards the connecting plate portion. The inlet flow channel is connected to the first flow channel, and the outlet flow channel is connected to the second flow channel.

3. The battery device according to claim 2, characterized in that, A liquid inlet is provided at the end of the first heat exchange plate portion that is away from the connecting plate portion, and the liquid inlet is connected to the first heat exchange channel. The second heat exchange plate portion is provided with a liquid outlet at the end opposite to the connecting plate portion, and the liquid outlet is connected to the second heat exchange channel.

4. The battery device according to claim 2, characterized in that, The intermediate heat exchange plate section also includes a connecting channel, one end of which is connected to the liquid inlet channel and the other end of which is connected to the liquid outlet channel.

5. The battery device according to claim 2, characterized in that, The intermediate heat exchange plate is provided with a first through hole and a second through hole. The first through hole is connected to the liquid inlet channel, and the second through hole is connected to the liquid outlet channel. The connecting plate is provided with a first flow hole that communicates with the first flow channel, and the first flow hole and the first through hole are correspondingly connected in the third direction. The connecting plate is also provided with a second flow hole that communicates with the second flow channel, and the second flow hole and the second through hole are correspondingly connected in the third direction.

6. The battery device according to claim 2, characterized in that, The liquid inlet channel and the liquid outlet channel of the intermediate heat exchange plate are arranged sequentially along the first direction. Both the liquid inlet channel and the liquid outlet channel extend along the second direction. The extension length of the liquid inlet channel along the second direction is L1, and the extension length of the liquid outlet channel along the second direction is L2, wherein L1 > L2.

7. The battery device according to claim 6, characterized in that, The first flow channel and the second flow channel are arranged adjacent to each other along the second direction, and the second flow channel is closer to the intermediate heat exchange plate relative to the first flow channel along the second direction.

8. The battery device according to claim 2, characterized in that, The liquid inlet channel includes two liquid inlet sub-channels, and the liquid outlet channel includes two liquid outlet sub-channels. The two liquid inlet sub-channels and the two liquid outlet sub-channels are connected in a one-to-one correspondence.

9. The battery device according to claim 8, characterized in that, The liquid inlet channel further includes a liquid inlet confluence channel, which is located between the first channel and the two liquid inlet sub-channels. The liquid inlet confluence channel is connected to the first channel, and the two liquid inlet sub-channels are respectively connected to the liquid inlet confluence channel.

10. The battery device according to claim 8, characterized in that, The liquid outlet channel further includes a liquid outlet confluence channel, which is located between the second channel and the two liquid outlet sub-channels. The liquid outlet confluence channel is connected to the second channel, and the two liquid outlet sub-channels are respectively connected to the liquid outlet confluence channel.

11. The battery device according to claim 2, characterized in that, The number of intermediate heat exchange plates is multiple, and the multiple intermediate heat exchange plates are located between the first end heat exchange plate and the second end heat exchange plate, and the multiple intermediate heat exchange plates are spaced apart along the first direction.

12. The battery device according to claim 11, characterized in that, Multiple intermediate heat exchange channels are connected in parallel.

13. The battery device according to claim 2, characterized in that, The connecting plate includes a first flow channel and a second flow channel arranged adjacent to each other. The connecting plate portion is provided with a third flow hole communicating with the first flow channel, and the first end heat exchange plate portion is provided with a third through hole corresponding to the third flow hole. The connecting plate portion is also provided with a fourth flow hole communicating with the second flow channel, and the second end heat exchange plate portion is provided with a fourth through hole corresponding to the fourth flow hole.

14. The battery device according to claim 13, characterized in that, The first end heat exchange channel includes a plurality of first end heat exchange sub-channels arranged sequentially along the second direction, and each of the first end heat exchange sub-channels is connected to the third flow hole; the second end heat exchange channel includes a plurality of second end heat exchange sub-channels arranged sequentially along the second direction, and each of the second end heat exchange sub-channels is connected to the fourth flow hole.

15. The battery device according to any one of claims 1-14, characterized in that, The intermediate heat exchange plate includes a sealing plate and a flow channel plate connected to each other. The flow channel plate is disposed on the side of the sealing plate away from the battery cell assembly. The flow channel plate protrudes to the side away from the sealing plate to form a protrusion. The protrusion and the sealing plate form the intermediate heat exchange flow channel.

16. The battery device according to claim 15, characterized in that, The intermediate heat exchange channel includes two liquid inlet sub-channels; The protrusion includes two first protruding sub-parts spaced apart along the first direction, and the two first protruding sub-parts respectively form two liquid inlet channels with the sealing plate; A first groove is provided between the two first protruding sub-parts, and the side of the first groove facing the sealing plate is connected to the sealing plate.

17. The battery device according to claim 15, characterized in that, The intermediate heat exchange channel includes two liquid outlet sub-channels; The protrusion includes two second protruding sub-parts spaced apart along the first direction, and the two second protruding sub-parts respectively form two liquid outlet channels between themselves and the sealing plate; A second groove is provided between the two second protruding parts, and the side of the second groove facing the sealing plate is connected to the sealing plate.

18. The battery device according to claim 17, characterized in that, The intermediate heat exchange channel includes two connecting sub-channels, each of which is connected to the liquid inlet sub-channel and the liquid outlet sub-channel, respectively. The protrusion includes two third protruding sub-parts spaced apart along the second direction, and the two third protruding sub-parts respectively form two connecting sub-channels with the sealing plate; A third groove is provided between the two third protruding sub-parts, and the side of the third groove facing the sealing plate is connected to the sealing plate.

19. The battery device according to any one of claims 1-14, characterized in that, Both the first end heat exchange plate portion and the second end heat exchange plate portion include a heat exchange shell and a partition rib. The partition rib is disposed inside the heat exchange shell. The first end heat exchange channel is divided into different first end heat exchange sub-channels by the partition rib, and the second end heat exchange channel is divided into different second end heat exchange sub-channels by the partition rib.

20. The battery device according to claim 19, characterized in that, Both the first end heat exchange plate and the second end heat exchange plate are integrally formed structures.

21. The battery device according to claim 19, characterized in that, The thermal management component further includes a connecting plate portion, wherein the first end heat exchange plate portion and the second end heat exchange plate portion are respectively welded to the connecting plate portion.

22. The battery device according to claim 21, characterized in that, The connecting plate is provided with a third flow hole and a fourth flow hole. The end of the first heat exchange plate is inserted into the third flow hole, and the end of the second heat exchange plate is inserted into the fourth flow hole.

23. The battery device according to any one of claims 1-14, characterized in that, The battery cell includes a housing and electrode terminals. The electrode terminals are disposed on one side of the housing along the third direction. The first end heat exchange plate portion, the middle heat exchange plate portion, and the second end heat exchange plate portion are respectively spaced apart from the electrode terminals along the first direction.

24. The battery device according to claim 23, characterized in that, The first end heat exchange plate, the middle heat exchange plate, and the second end heat exchange plate are respectively bonded to the outer casing on the side facing the battery cell assembly.

25. The battery device according to claim 23, characterized in that, The intermediate heat exchange plate portion projects along the third direction and covers at least a portion of the adjacent battery cell assembly.

26. The battery device according to claim 25, characterized in that, The intermediate heat exchange plate includes an inlet channel and an outlet channel. The projection of the inlet channel in the third direction at least partially overlaps with the projection of one of the battery cell components in the third direction, and the projection of the outlet channel in the third direction at least partially overlaps with the projection of another battery cell component in the third direction.

27. An electrical device, characterized in that... Includes a battery device according to any one of claims 1-26, the battery device being used to provide electrical energy.

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