Battery device and electric equipment

Abstract

The utility model discloses a battery device and electric equipment, the battery device comprises a box body, a plurality of battery monomers and a heat exchange assembly, the plurality of battery monomers are arranged in the box body in an array structure, each battery monomer comprises an electrode terminal and a plurality of side walls, the plurality of side walls comprise a first side wall, the electrode terminal is arranged on the first side wall, and the heat exchange assembly is arranged on the first side wall. All the electrode terminals of the plurality of battery monomers face the same direction, the heat exchange assembly comprises a first heat exchange part, the first heat exchange part and the electrode terminals are located on the same side and can exchange heat with the battery monomers, on the same battery monomer, the first heat exchange part is arranged farther away from the center position of the first side wall than the electrode terminals, and in the preset direction, the first heat exchange part is arranged at the center position of the first side wall; the first heat exchange parts are arranged on the sides, away from the center position, of the electrode terminals at intervals, and the preset direction is parallel to the first side wall. The first heat exchange part and the electrode terminal of the battery monomer are arranged on the same side, so that the situation that the first heat exchange part independently occupies the space of the box body is reduced, and the space utilization rate of the box body is improved.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a battery device and electrical equipment. Background Technology

[0002] With the development of new energy sources, more and more fields are adopting new energy as a power source. Due to its advantages such as high energy density, rechargeability, safety, and environmental friendliness, battery devices are widely used in new energy vehicles, consumer electronics, energy storage systems, and other fields.

[0003] In related technologies, the battery device includes a housing, a heat exchanger with flow channels, and multiple battery cells. The multiple battery cells and the heat exchanger are respectively installed in the housing. The heat exchanger occupies space in the height direction of the housing, resulting in low space utilization in the height direction of the housing. Utility Model Content

[0004] In view of the above problems, this application provides a battery device and electrical equipment that solves the problem of low space utilization in the housing.

[0005] The first aspect of this application discloses a battery device, the battery device comprising:

[0006] Box;

[0007] Multiple battery cells are arranged in an array inside the housing. Each battery cell includes electrode terminals and multiple sidewalls. The multiple sidewalls include a first sidewall, and the electrode terminals are located on the first sidewall. All electrode terminals of the multiple battery cells have the same orientation.

[0008] A heat exchange assembly includes a first heat exchange portion located on the same side as the electrode terminal. The first heat exchange portion is connected to the first sidewall of the battery cell and can exchange heat with the battery cell. On the same battery cell, the first heat exchange portion is located further away from the center of the first sidewall than the electrode terminal. In a preset direction, the first heat exchange portion is spaced apart on the side of the electrode terminal away from the center position. The preset direction is parallel to the first sidewall.

[0009] Specifically, the electrode terminals of the battery cells occupy space inside the housing. By placing the first heat exchange section on the same side as the electrode terminals of the battery cells and placing the first heat exchange section within the space occupied by the electrode terminals, the space occupied by the first heat exchange section is reduced, thereby making the structure inside the housing more compact and improving the space utilization of the housing.

[0010] In some embodiments of this application, along the height direction of the box, the interior of the box includes an inner bottom surface and an inner top surface that are disposed opposite to each other;

[0011] The electrode terminals are positioned facing the inner bottom surface or the inner top surface.

[0012] This configuration allows for adjustments to the orientation of the electrode terminals of individual battery cells to meet the needs of different application scenarios, thereby expanding the applicability of the battery device.

[0013] In some embodiments of this application, the array structure is a rectangular array structure, which includes a first array direction and a second array direction that are perpendicular to each other. In the first array direction, the rectangular array structure includes multiple rows, each row including multiple battery cells. In the second array direction, the rectangular array structure includes multiple columns, each column including multiple battery cells. One of the first and second array directions is the length direction of the housing, and the other is the width direction of the housing. This arrangement facilitates the layout of multiple battery cells within the housing, improves the ease of battery cell assembly, and maximizes the space utilization within the housing.

[0014] In some embodiments of this application, the first heat exchange portion includes a plurality of first heat exchange elements, which are spaced apart along a first array direction. Each first heat exchange element is arranged along a second array direction, and at least a portion of the battery cells in two adjacent rows are respectively connected to the same first heat exchange element.

[0015] This configuration allows adjacent rows of battery cells to exchange heat through a single heat exchanger. While ensuring adequate heat exchange, it reduces the number of components, further improving the space utilization within the housing and lowering manufacturing costs.

[0016] In some embodiments of this application, the first heat exchange portion further includes a second heat exchange element. Along the first array direction, at least one side of the plurality of first heat exchange elements is provided with a second heat exchange element, and the second heat exchange element and the adjacent first heat exchange element are located on opposite sides of the electrode terminals of the same battery cell. In the rectangular array structure, at least some battery cells in the outermost row are thermally connected to the same second heat exchange element.

[0017] This configuration allows the battery cells in the outermost row of the rectangular array structure to exchange heat effectively, thereby improving the heat exchange efficiency.

[0018] In some embodiments of this application, along the first array direction, the first heat exchanger includes a first maximum size, and the second heat exchanger includes a second maximum size, wherein the second maximum size is greater than zero and less than or equal to half of the first maximum size. This arrangement facilitates the assembly of the second heat exchanger, reduces the space occupied by the second heat exchanger within the housing, thereby improving the space utilization of the housing. In addition, it also effectively reduces the interference of the second heat exchanger with the electrode terminals.

[0019] In some embodiments of this application, the heat exchange assembly further includes a second heat exchange section, which includes a plurality of third heat exchange elements. At least two adjacent battery cells are connected by a third heat exchange element, and the third heat exchange element is thermally connected to the two adjacent battery cells. This arrangement further improves the effective heat exchange of the battery cells in the rectangular array structure, thereby enhancing the heat exchange effect.

[0020] In some embodiments of this application, the third heat exchanger is arranged along the direction of the first array, and in two adjacent columns, at least some of the battery cells are thermally connected to the third heat exchanger. This arrangement allows the third heat exchanger to exchange heat between the battery cells in two adjacent columns, effectively achieving heat exchange for multiple battery cells using a single component. This simplifies the structure of the heat exchange assembly, reduces the space occupied within the housing, improves space utilization, and lowers manufacturing costs.

[0021] In some embodiments of this application, the multiple sidewalls further include a second sidewall, which intersects with the first sidewall. Among the multiple sidewalls, the second sidewall has the largest area and is thermally connected to the third heat exchanger. This arrangement increases the contact area between the battery cell and the third heat exchanger, thereby further improving the heat exchange efficiency of the third heat exchanger for the battery cell.

[0022] In some embodiments of this application, the third heat exchanger is arranged along the second array direction, and at least a portion of the battery cells in two adjacent rows are thermally connected to the third heat exchanger. This arrangement utilizes the third heat exchanger to exchange heat between the battery cells in two adjacent rows, effectively achieving heat exchange for multiple battery cells using a single component. This simplifies the structure of the heat exchange assembly, reduces the space occupied within the housing, improves space utilization, and lowers manufacturing costs.

[0023] In some embodiments of this application, the multiple sidewalls further include a second sidewall and a third sidewall, which intersect with the first sidewall. Among the multiple sidewalls, the second sidewall has the largest area, and the third sidewall is thermally connected to the third heat exchanger. This arrangement provides expansion space for the battery cell during use, thereby improving the safety performance of the battery device.

[0024] In some embodiments of this application, the first heat exchanger is a first plate-shaped member, and the thickness direction of the first plate-shaped member is consistent with the height direction of the box body.

[0025] And / or, the second heat exchanger is a second plate-shaped element, the thickness direction of the second plate-shaped element being consistent with the height direction of the box body;

[0026] And / or, the third heat exchanger is a third plate-shaped member, and the arrangement direction of the two adjacent battery cells that are thermally connected to the third heat exchanger is consistent with the thickness direction of the third plate-shaped member.

[0027] This design further reduces the space occupied inside the container, thereby improving the utilization rate of the space inside the container.

[0028] In some embodiments of this application, at least one of the first, second, and third heat exchangers includes a medium flow channel for containing the heat exchange medium. This configuration improves the heat exchange efficiency of the battery cells, effectively enhancing the heat exchange performance.

[0029] In some embodiments of this application, the first heat exchanger, the second heat exchanger, and the third heat exchanger all include a medium flow channel, and the heat exchange assembly also includes a flow collector, which is connected to the medium flow channels of the first heat exchanger, the second heat exchanger, and the third heat exchanger, respectively. This arrangement allows for the interconnection of the first, second, and third heat exchangers using the flow collector, facilitating a unified layout of the heat exchange assembly and improving assembly convenience.

[0030] In some embodiments of this application, the battery cell further includes a pressure relief mechanism;

[0031] The pressure relief mechanism is disposed on the first side wall and spaced apart from the electrode terminals and the first heat exchange section; or the pressure relief mechanism is disposed on one of the multiple side walls, and the pressure relief mechanism and the electrode terminals are disposed on different side walls. The pressure relief mechanism improves the safety performance of the individual battery cells, thereby enhancing the safety performance of the battery device. Furthermore, the placement of the pressure relief mechanism expands the application scenarios of the battery device.

[0032] In some embodiments of this application, the pressure relief mechanism is disposed on the first sidewall, and the electrode terminals include a first electrode terminal and a second electrode terminal disposed at intervals. The first electrode terminal and the second electrode terminal are respectively disposed at intervals on opposite sides of the pressure relief mechanism, and the center distance between the first electrode terminal and the second electrode terminal is in the range of 50 mm to 200 mm.

[0033] This configuration allows the first sidewall to provide more space for the first heat exchange section, thereby increasing the contact area between the first heat exchange section and the first sidewall, and thus improving the heat exchange efficiency of the first heat exchange section for the battery cells.

[0034] In some embodiments of this application, the center distance between the first electrode terminal and the second electrode terminal is in the range of 60 mm to 100 mm. This arrangement, by further controlling the distance between the first and second electrode terminals, allows for a larger space outside the first and second electrode terminals on the first sidewall, thereby increasing the contact area between the first heat exchange portion and the first sidewall, and ultimately improving the heat exchange efficiency of the first heat exchange portion for the battery cell.

[0035] In some embodiments of this application, the pressure relief mechanism is disposed on one of the multiple sidewalls, and the pressure relief mechanism and the electrode terminals are disposed on different sidewalls. The electrode terminals include a first electrode terminal and a second electrode terminal that are spaced apart, and the center distance between the first electrode terminal and the second electrode terminal is in the range of 30 mm to 200 mm.

[0036] This configuration, without adversely affecting the first electrode terminal, the second electrode terminal, and the pressure relief mechanism, allows the first sidewall to provide more space for the first heat exchange section, thereby increasing the contact area between the first heat exchange section and the first sidewall, and thus improving the heat exchange efficiency of the first heat exchange section for the battery cell.

[0037] In some embodiments of this application, the center distance between the first electrode terminal and the second electrode terminal is in the range of 40 mm to 80 mm. This arrangement, by further controlling the distance between the first and second electrode terminals, allows for a larger space outside the first and second electrode terminals on the first sidewall, thereby increasing the contact area between the first heat exchange portion and the first sidewall, and ultimately improving the heat exchange efficiency of the first heat exchange portion for the battery cell.

[0038] A second aspect of this application provides an electrical device that includes the battery device described above.

[0039] In the battery device of this electrical equipment, the electrode terminals of the battery cells occupy space inside the box. By placing the first heat exchange part on the same side as the electrode terminals of the battery cells and placing the first heat exchange part in the space occupied by the electrode terminals, the space occupied by the first heat exchange part alone in the box is reduced, thereby making the structure inside the box more compact and improving the space utilization of the box.

[0040] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0041] Figure 1A schematic diagram of the structure of a vehicle according to one embodiment of this application is shown.

[0042] Figure 2 A schematic diagram of the structure of a battery device according to one embodiment of this application is shown.

[0043] Figure 3 A schematic diagram of a portion of the structure of a battery device according to one embodiment of this application is shown.

[0044] Figure 4 for Figure 3 A cross-sectional view of the AA position of the battery device shown in the diagram;

[0045] Figure 5 for Figure 4 A magnified schematic diagram of part B in the structure shown;

[0046] Figure 6 A schematic diagram of a portion of the structure of a battery device according to one embodiment of this application is shown.

[0047] Figure 7 for Figure 6 A cross-sectional view of the battery device at the CC position shown;

[0048] Figure 8 for Figure 7 A magnified schematic diagram of part D in the structure shown;

[0049] Figure 9 for Figure 6 A partial structural schematic diagram of the battery device shown;

[0050] Figure 10 for Figure 9 A schematic diagram of the heat exchange assembly shown;

[0051] Figure 11 for Figure 3 A partial structural schematic diagram of the battery device shown;

[0052] Figure 12 for Figure 11 The diagram shows the structure of the heat exchange component.

[0053] The attached figures are labeled as follows:

[0054] 1000, vehicles;

[0055] 100. Battery assembly; 200. Controller; 300. Motor;

[0056] 10. Box body;

[0057] 11. First box;

[0058] 12. Second box; 121. Inner bottom surface;

[0059] 20. Battery cell;

[0060] 21. First sidewall; 22. Electrode terminal; 221. First electrode terminal; 222. Second electrode terminal; 23. Pressure relief mechanism;

[0061] 30. Heat exchange components;

[0062] 31. First heat exchange section; 311. First heat exchange element; 312. Second heat exchange element; 32. Manifold; 33. Second heat exchange section; 331. Third heat exchange element;

[0063] X, First array direction; Y, Second array direction; Z, Height direction; a, First center distance; b, Second center distance; c, First distance; d, Second distance; e, First maximum size; f, Second maximum size; p, Center position. Detailed Implementation

[0064] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0066] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0067] In this document, the term "embodiment" means that a particular 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 separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0068] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0069] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0070] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of 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. Therefore, they should not be construed as limitations on the embodiments of this application.

[0071] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0072] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0073] In related technologies, the battery device includes a housing, a heat exchanger with flow channels, and multiple battery cells. The multiple battery cells and the heat exchanger are respectively installed in the housing. The heat exchanger occupies space in the height direction of the housing, resulting in low space utilization in the height direction of the housing.

[0074] To address the aforementioned issues, this application provides a battery device comprising a housing, multiple battery cells, and a heat exchange assembly. The multiple battery cells are arranged in an array within the housing. Each battery cell includes electrode terminals and multiple sidewalls, including a first sidewall on which the electrode terminals are located. All electrode terminals of the multiple battery cells face the same direction. The heat exchange assembly includes a first heat exchange section located on the same side as the electrode terminals. The first heat exchange section is connected to the first sidewall of the battery cell and can exchange heat with the battery cell. On the same battery cell, the first heat exchange section is positioned further away from the center of the first sidewall than the electrode terminals. Furthermore, in a predetermined direction, the first heat exchange section is spaced apart on the side of the electrode terminals away from the center, and this predetermined direction is parallel to the first sidewall. By placing the first heat exchange section on the same side as the electrode terminals within the space occupied by the electrode terminals, the space occupied by the first heat exchange section is reduced, resulting in a more compact structure within the housing and improved space utilization.

[0075] The technical solutions described in this application are not limited to the devices described above, but can also be applied to all devices that use battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0076] For example, such as Figure 1 The diagram shown is a structural schematic of a vehicle according to one embodiment of this application. The vehicle 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. The vehicle's interior can include a motor 300, a controller 200, and a battery device 100. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be located at the bottom, front, or rear of the vehicle. The battery device 100 can be used to power the vehicle; for example, it can serve as the vehicle's operating power source for the vehicle's electrical system, such as for the power requirements of starting, navigation, and operation. In another embodiment of this application, the battery device 100 can not only serve as the vehicle's operating power source but also as the vehicle's driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle.

[0077] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0078] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0079] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0080] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0081] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0082] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0083] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0084] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0085] 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.

[0086] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0087] In some embodiments of this application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0088] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0089] In some embodiments of this application, the battery cell includes a housing, a pressure relief mechanism, an electrode assembly, and an insulating member. The housing includes multiple sidewalls, including a first sidewall. The pressure relief mechanism is provided on the first sidewall and is configured to open or close according to whether the internal pressure of the housing reaches a pressure threshold. The electrode assembly is disposed inside the housing. The insulating member is disposed inside the housing and between the housing and the electrode assembly for insulating and isolating the housing and the electrode assembly. The insulating member abuts against the electrode assembly.

[0090] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0091] The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. 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 between them while allowing active ions to pass through.

[0092] 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.

[0093] 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.

[0094] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. 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 alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0095] 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 battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0096] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, 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, a positive electrode active material is filled and / or deposited within the foamed metal.

[0097] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0098] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. 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 alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0099] 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.

[0100] 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.

[0101] 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. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0102] In some embodiments, the negative electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, 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.

[0103] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0104] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0105] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0106] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0107] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0108] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0109] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0110] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0111] In some implementations, the electrode assembly is a stacked structure.

[0112] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0113] 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.

[0114] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0115] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0116] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0117] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0118] In some embodiments, the electrode assembly has tabs on its plates that allow current to be drawn out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0119] In some embodiments, a pressure relief mechanism is provided on the casing. The pressure relief mechanism is used to release the internal gas of the battery cell.

[0120] As an example, the internal pressure or temperature of a battery cell is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is broken, thereby creating an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell.

[0121] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0122] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0123] The term "actuation" as used in this application refers to the activation or actuation of the pressure relief mechanism to a certain state, thereby releasing the internal pressure and temperature of the battery cell. The actions of the pressure relief mechanism may include, but are not limited to: movement of components within the mechanism to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the mechanism, etc. When the pressure relief mechanism is actuated, the high-temperature, high-pressure substances inside the battery cell are discharged as waste from the actuated portion. This method allows for pressure and temperature relief of the battery cell under controllable pressure or temperature, thereby reducing the potential for more serious accidents.

[0124] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be configured as a through hole for venting gas inside the battery cell.

[0125] The emissions from battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0126] The positive and negative electrodes can be drawn from the same end of the electrode plate, or they can be drawn from opposite ends of the electrode plate.

[0127] The structures of the positive and negative electrode tabs can be the same or different. Taking the positive electrode tab as an example, the positive electrode tab can include multiple positive electrode tab layers, which are stacked together to form the positive electrode tab. The positive electrode tab can include at least two parts: one part is located between the main body of the electrode sheet and the insulating component, and the other part is located between the insulating component and the electrode lead-out component.

[0128] The insulating component can insulate at least part of the tab from the end face of the main body, thereby reducing the risk of the tab being inserted into the main body when the battery cell is subjected to external impacts, vibrations, etc., thus reducing the risk of short circuit in the battery cell and improving the reliability of the battery cell.

[0129] The insulating component can be a one-piece structure or a modular structure. As one example, the insulating component is composed of multiple independently formed parts connected together. As another example, the insulating component is formed as a single piece by stamping.

[0130] For example, the insulating part is made of plastic. The insulating part is integrally molded by injection molding. Plastic parts are easy to process and have low manufacturing costs.

[0131] In some embodiments of this application, the housing includes a shell and an end cap, the shell having an opening, the end cap being connected to the shell and closing the opening, the end cap forming a first sidewall, and a pressure relief mechanism being disposed on the end cap.

[0132] In some embodiments of this application, the outer casing can be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the outer casing can be a sealed structure or a non-sealed structure. As an example, when the outer casing is a non-sealed structure, the outer casing serves to protect the electrode assembly, and a sealing bag is included between the outer casing and the electrode assembly. The sealing bag is used to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the outer casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte. The casing may have one or more openings. End caps may also be provided one or more.

[0133] In addition, the connection methods between the end cap and the housing include, but are not limited to, snap-fit, adhesive, welding or connection via connectors.

[0134] In some embodiments of this application, the battery cell further includes electrode terminals, which are disposed on the end cap and electrically connected to the electrode assembly. The electrode terminals are electrically connected to the tabs of the electrode assembly. The electrode terminals can be directly connected to the tabs or indirectly connected to the tabs through a current collector. The electrode terminals can be disposed on the end cap or on the housing. In the embodiments shown in this application, the electrode terminals are disposed on the end cap.

[0135] like Figures 2 to 12As shown, in some embodiments of this application, a battery device is proposed. The battery device includes a housing 10, a plurality of battery cells 20, and a heat exchange assembly 30. The plurality of battery cells 20 are arranged in an array within the housing 10. Each battery cell 20 includes a plurality of sidewalls and electrode terminals 22. The plurality of sidewalls includes a first sidewall 21. The electrode terminals 22 are disposed on the first sidewall 21. All electrode terminals 22 of the plurality of battery cells 20 have the same orientation. The heat exchange assembly 30 includes a first heat exchange portion 31. The first heat exchange portion 31 is located on the same side as the electrode terminals 22. The first heat exchange portion 31 is connected to the first sidewall 21 of the battery cell 20 and can exchange heat with the battery cell 20. On the same battery cell 20, the first heat exchange portion 31 is disposed further away from the center position p of the first sidewall 21 than the electrode terminals 22. In a preset direction, the first heat exchange portion 31 is spaced apart on the side of the electrode terminals 22 away from the center position p. The preset direction is parallel to the first sidewall 22.

[0136] In this embodiment, the housing 10 may include a first housing 11 and a second housing 12. The first housing 11 and the second housing 12 are fastened together, forming a closed space inside the housing 10 to accommodate the battery cells 20. An open receiving slot is formed inside the second housing 12, and multiple battery cells 20 and heat exchange components 30 are respectively disposed within the receiving slot. The first housing 11 is a cover structure (it can be a flat plate or a pressed structure), and the first housing 11 is connected to the second housing 12 (the connection method includes, but is not limited to, bonding, welding, or connection via connectors) and closes the opening of the receiving slot.

[0137] like Figures 2 to 12 As shown, the following explanation will be based on the example of a rectangular structure for box 10. The arrangement of the first box 11 and the second box 12 is the height direction Z of box 10. Both the first box 11 and the second box 12 are rectangular structures. The length direction of the second box 12 is the length direction of box 10, and the height direction Z of the second box 12 is the width direction of box 10.

[0138] The battery cell 20 includes multiple sidewalls, and the first sidewall 21 is one of the multiple sidewalls. In the height direction Z of the housing 10, the first sidewall 21 is disposed facing the first housing 11 or facing the second housing 12. The first sidewall 21 is a structure disposed on the housing of the battery cell 20, or it can be an end cap of the housing.

[0139] The electrode terminal 22 protrudes from the first side wall 21 and extends along the height direction Z of the housing 10. The electrode terminal 22 of the battery cell 20 occupies the space in the height direction Z of the housing 10 to meet the installation requirements of the battery cell 20.

[0140] In this application, the first heat exchange part 31 and the electrode terminal 22 of the battery cell 20 are located on the same side. The first heat exchange part 31 is located in the space occupied by the electrode terminal 22, which reduces the situation where the first heat exchange part 31 occupies the space of the housing 10 alone. As a result, the structure inside the housing 10 is more compact, and the space utilization rate of the housing 10 is improved.

[0141] It should be understood that in this application, the first heat exchange section 31 can exchange heat with the battery cell 20 through the first sidewall 21. The heat exchange method can be to cool only the battery cell 20, to heat only the battery cell 20, or to both heat and cool the battery cell 20.

[0142] In this application, as Figure 2 , Figure 3 , Figure 6 , Figure 9 and Figure 11 As shown, multiple battery cells 20 are arranged in an array within the housing 10. In this array structure, some of the battery cells 20 can form a battery cell assembly to form multiple battery cell assemblies, or all of the battery cells 20 can form a battery cell assembly.

[0143] In this application, the preset direction is parallel to the first sidewall 22. The preset direction can be consistent with the array direction of the array structure (for example, if the array is a rectangular array structure, the preset direction can be the row array direction of the rectangular array structure or the column array direction of the rectangular array structure). The preset direction can be consistent with the structural direction of the battery cell 20 (for example, when the battery cell 20 is a square battery cell, the rectangular preset direction can be the length direction of the square battery cell or the width direction of the square battery cell).

[0144] In addition, in this application, the center position p of the first sidewall 21 of the battery cell 20 refers to the geometric center of the surface of the first sidewall 21 facing outward.

[0145] The first heat exchange section 31 is farther away from the center position p of the battery cell 20 than the electrode terminal 22 (e.g., Figure 5 or Figure 8 As shown, the electrode terminal 22 is positioned close to the center position p of the first sidewall 21, while the first heat exchange portion 31 is positioned away from the center position p of the first sidewall 21.

[0146] It should be noted that the first heat exchange section 31 and the electrode terminal 22 are spaced apart, and the direction of the spacing is parallel to the first sidewall 21. This arrangement can reduce the adverse effects between the first heat exchange section 31 and the electrode terminal 22.

[0147] The first heat exchange section 31 can be a metal part (such as iron, copper, aluminum or stainless steel parts) or a non-metal part (a part with thermal conductivity, such as graphite parts).

[0148] In this application, the first heat exchange part 31 is a metal component, and the electrode terminal 22 is a live component. The distance between the first heat exchange part 31 and the electrode terminal 22 needs to be greater than or equal to 5 mm to achieve effective insulation between the first heat exchange part 31 and the electrode terminal 22. Alternatively, an insulating structure (such as insulating adhesive or insulating components) can be provided between the first heat exchange part 31 and the electrode terminal 22 to improve the insulation effect.

[0149] It should be noted that the first heat exchange section 31 is connected to the first side wall 21 of the battery cell 20. The two can be directly connected or indirectly connected. The battery cell 20 can transfer heat to each other through the first side wall 21 and the first heat exchange section 31, thereby using the first heat exchange section 31 to regulate the temperature of the battery cell 20 so that the battery can be positioned within the optimal operating temperature range.

[0150] Multiple battery cells 20 disposed within the housing 10 are arranged in an array structure, which includes, but is not limited to, a rectangular array structure, a circular array structure, or other forms of array structure.

[0151] Furthermore, the distance between the first heat exchange section 31 and the first sidewall 21 is a first distance c, and the distance between the electrode terminal 22 and the first sidewall 21 is a second distance d. The difference between the first distance c and the second distance d is greater than or equal to zero and less than or equal to 10 mm (for example, it can be 0 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm). This arrangement allows the first heat exchange section 31 to have sufficient heat exchange capacity while reducing the space occupied in the height direction Z of the housing 12.

[0152] In some embodiments of this application, along the height direction Z of the housing 10, the interior of the housing 10 includes opposing inner bottom surfaces 121 (e.g., ...). Figure 2 , Figure 3 and Figure 6 (shown in the figure) and the inner top surface (not shown in the figure). The electrode terminal 22 is disposed facing the inner bottom surface 121, or the electrode terminal 22 is disposed facing the inner top surface.

[0153] Specifically, the box 10 is formed by fastening together a first box 11 and a second box 12, and the arrangement direction of the first box 11 and the second box 12 is the thickness direction of the box 10. The first box 11 is located above the second box 12, with its inner top surface formed on the side of the first box 11 facing the second box 12, and its inner bottom surface 121 formed on the side of the second box 12 facing the first box 11.

[0154] All electrode terminals 22 of the battery cells 20 are located on the same side, and the electrode terminals 22 can all face the inner top surface or the inner bottom surface 121. This configuration allows for adjustment of the orientation of the electrode terminals 22 of the battery cells 20 to meet the needs of different application scenarios, thereby increasing the applicability of the battery device.

[0155] In some embodiments of this application, such as Figure 2 , Figure 3 , Figure 6 , Figure 9 and Figure 11 As shown, the array structure is a rectangular array structure, which includes a first array direction X and a second array direction Y that are perpendicular to each other. In the first array direction X, the rectangular array structure includes multiple rows, each row including multiple battery cells 20. In the second array direction Y, the rectangular array structure includes multiple columns, each column including multiple battery cells 20. One of the first array direction X and the second array direction Y is the length direction of the housing 10, and the other is the width direction of the housing 10.

[0156] Specifically, in this application, the housing 10 has a rectangular structure, and multiple battery cells 20 are arranged inside the housing 10 to form an array structure. By setting the array structure as a rectangular array structure, the array structure formed by the multiple battery cells 20 can be more adapted to the structure of the housing 10, thereby making full use of the space of the housing 10 and maximizing the space utilization rate inside the housing 10, thus improving the space utilization rate of the housing 10.

[0157] In addition, by setting the array structure to a rectangular array structure, it is easier to arrange and install multiple battery cells 20 in the housing 10, thereby improving the convenience of the assembly process, improving the assembly efficiency, and thus speeding up the production cycle.

[0158] It is important to understand that in a rectangular array structure, along the first array direction X, there are multiple rows, and the number of these multiple rows can be two, three, four, five, six, seven, eight, nine, ten, etc.

[0159] In a rectangular array structure, along the second array direction Y, there are multiple columns, where the number of columns can be two, three, four, five, six, seven, eight, nine, ten, etc.

[0160] In some embodiments of this application, the first heat exchange portion 31 includes a plurality of first heat exchange elements 311, which are spaced apart along a first array direction X. Each first heat exchange element 311 is arranged along a second array direction Y, and at least a portion of the battery cells 20 in two adjacent rows are respectively connected to the same first heat exchange element 311.

[0161] Specifically, there are multiple first heat exchange elements 311, and the number of multiple first heat exchange elements 311 can be two, three, four, five, six, seven, eight, nine, ten, etc.

[0162] Multiple first heat exchangers 311 are spaced apart in the first array direction X. Two adjacent first heat exchangers 311 are arranged in parallel. In addition, the multiple first heat exchangers 311 are spaced apart in the first array direction X by equal intervals or unequal intervals.

[0163] The first heat exchanger 311 is arranged along the second array direction Y, so that the battery cells 20 in two adjacent rows exchange heat through one first heat exchanger 311. While satisfying the heat exchange requirement, the number of components is reduced, which further improves the space utilization rate inside the housing 10 and also reduces the manufacturing cost.

[0164] It should be understood that, in the first array direction X, the heat exchange area of ​​the same first heat exchange element 311 and the battery cells 20 in two adjacent rows can be equal or unequal.

[0165] In some embodiments of this application, such as Figure 2 , Figure 3 , Figure 6 , Figure 9 and Figure 11 As shown, the first heat exchange section 31 also includes a second heat exchange element 312. Along the first array direction X, at least one side of the plurality of first heat exchange elements 311 is provided with a second heat exchange element 312, and the second heat exchange element 312 and the adjacent first heat exchange elements 311 are located on opposite sides of the electrode terminals 22 of the same battery cell 20. In the rectangular array structure, at least a portion of the battery cells 20 located in the outermost row are thermally connected to the same second heat exchange element 312.

[0166] Specifically, in the first array direction X, the multiple battery cells 20 in the rectangular array structure include two outermost rows. The row adjacent to the outermost row exchanges heat with two second heat exchangers 312 in the first array direction X, while the outermost row exchanges heat with only one second heat exchanger 312. By setting the second heat exchanger 312, the battery cells 20 in the outermost row of the rectangular array structure can fully exchange heat, thereby improving the heat exchange effect.

[0167] In some embodiments of this application, such as Figure 10 or Figure 12 As shown, along the first array direction X, the first heat exchanger 311 includes a first maximum size e, and the second heat exchanger 312 includes a second maximum size f, wherein the second maximum size f is greater than zero and less than half of the first maximum size e.

[0168] Specifically, all the battery cells 20 housed within the housing 10 are arranged in a rectangular array. The first array comprises multiple rows (each row including multiple battery cells 20), and the second array, in the Y direction, comprises multiple columns (each column including multiple battery cells 20). Along the X direction, two adjacent rows share a single first heat exchanger 311 for heat exchange. In the X direction, the inner side of the outermost row (the side with adjacent rows) shares a single first heat exchanger 311 with the adjacent row, while the outer side of the outermost row (the side without adjacent rows) exchanges heat with a second heat exchanger 312.

[0169] By setting the first maximum size e of the first heat exchanger 311 and the second maximum size f of the second heat exchanger 312 in the first array direction X, the multiple battery cells 20 in the outermost row can effectively exchange heat, thereby improving the heat exchange effect.

[0170] In addition, by setting the second maximum size to be greater than zero and less than or equal to half of the first maximum size e, it is easier to assemble the second heat exchanger 312, while reducing the space occupied by the second heat exchanger 312 in the internal space of the housing 10, thereby improving the space utilization of the housing 10. At the same time, it also effectively reduces the interference of the second heat exchanger 312 on the electrode terminal 22.

[0171] It should be noted that, in this application, the second maximum size f can be one-half, one-third, one-quarter, one-fifth, or one-sixth of the first maximum size e, etc.

[0172] In some embodiments of this application, such as Figure 2 , Figure 3 , Figure 6 , Figure 9 and Figure 11As shown, the heat exchange assembly 30 also includes a second heat exchange section 33, which includes a plurality of third heat exchange elements 331. At least one third heat exchange element 331 is provided between two adjacent battery cells 20, and the third heat exchange element 331 is thermally connected to the two adjacent battery cells 20.

[0173] Specifically, the thermal connection between the third heat exchanger 331 and the two adjacent battery cells 20 means that the third heat exchanger 331 can exchange heat with the two adjacent battery cells 20. The third heat exchanger 331 can heat only the battery cell 20, cool only the battery cell 20, or both heat and cool the battery cell 20.

[0174] The third heat exchanger 331 in the second heat exchange section 33 is disposed between two adjacent battery cells 20, and heat is exchanged between the two adjacent battery cells 20 by the third heat exchanger 331. By adding the second heat exchange section 33 on the basis of the first heat exchange section 31, the effective heat exchange of the battery cells 20 in the rectangular array structure can be further improved, and the heat exchange effect is further enhanced.

[0175] In some embodiments of this application, such as Figure 11 and Figure 12 As shown, the third heat exchanger 331 is arranged along the first array direction X, and in two adjacent columns, at least some of the battery cells 20 are thermally connected to the third heat exchanger 331.

[0176] Specifically, the third heat exchanger 331 is used to exchange heat with the battery cells 20 in two adjacent columns. That is, heat exchange with multiple battery cells 20 is achieved by using one part, which simplifies the structure of the heat exchange assembly 30, reduces the space occupied in the housing 10, improves the space utilization rate in the housing 10, and also reduces the manufacturing cost.

[0177] It should be understood that, in the first array direction X, the heat exchange area of ​​the same third heat exchanger 331 and the battery cells 20 in the two adjacent columns can be equal or unequal.

[0178] In some embodiments of this application, such as Figure 11 and Figure 12 As shown, the multiple sidewalls also include a second sidewall, which is intersecting with the first sidewall 21. Among the multiple sidewalls, the second sidewall has the largest area and is thermally connected to the third heat exchanger 331.

[0179] Specifically, the second sidewall intersects with the first sidewall 21 (the angle between them is greater than 0 degrees and less than 180 degrees, for example, it can be 90 degrees, etc.). By thermally connecting the "large surface (the second sidewall, i.e. the sidewall with the largest area)" of the battery cell 20 with the third heat exchanger 331, the contact area between the battery cell 20 and the third heat exchanger 331 can be increased, thereby further improving the heat exchange efficiency of the third heat exchanger 331 on the battery cell 20.

[0180] In some embodiments of this application, such as Figure 9 and Figure 10 As shown, the third heat exchanger 331 is arranged along the second array direction Y, and at least a portion of the battery cells 20 in two adjacent rows are thermally connected to the third heat exchanger 331.

[0181] Specifically, the third heat exchanger 331 is used to exchange heat with the battery cells 20 in two adjacent columns. That is, heat exchange with multiple battery cells 20 is achieved by using one part, which simplifies the structure of the heat exchange assembly 30, reduces the space occupied in the housing 10, improves the space utilization rate in the housing 10, and also reduces the manufacturing cost.

[0182] It should be understood that, in the second array direction Y, the heat exchange area of ​​the same third heat exchanger 331 and the battery cells 20 in the two adjacent rows can be equal or unequal.

[0183] In some embodiments of this application, such as Figure 9 and Figure 10 As shown, the multiple sidewalls also include a second sidewall and a third sidewall. The second sidewall and the third sidewall are respectively arranged to intersect with the first sidewall 21. Among the multiple sidewalls, the second sidewall is the sidewall with the largest area, and the third sidewall is thermally connected to the third heat exchanger 331.

[0184] Specifically, during the use of the battery device, the battery cell 20 will expand, and the expansion location will usually appear on the side wall with the largest area. By thermally connecting the third heat exchanger 331 to the third side wall, expansion space can be provided for the battery cell 20 during use, thereby improving the safety performance of the battery device.

[0185] In some embodiments of this application, such as Figure 10 or Figure 12 As shown, the first heat exchanger 311 is a first plate-shaped component, and the thickness direction of the first plate-shaped component is consistent with the height direction Z of the housing 10. This arrangement can further reduce the space occupied inside the housing 10, thereby improving the space utilization rate inside the housing 10.

[0186] In some embodiments of this application, such as Figure 10 or Figure 12 As shown, the second heat exchanger 312 is a second plate-shaped component, and the thickness direction of the second plate-shaped component is consistent with the height direction Z of the housing 10. This arrangement can further reduce the space occupied inside the housing 10, thereby improving the space utilization rate inside the housing 10.

[0187] In some embodiments of this application, such as Figure 10 or Figure 12 As shown, the third heat exchanger 331 is a third plate-shaped component, and the arrangement direction of the two adjacent battery cells 20 that are thermally connected to the third heat exchanger 331 is consistent with the thickness direction of the third plate-shaped component. This arrangement can further reduce the space occupied inside the housing 10, thereby improving the space utilization rate inside the housing 10.

[0188] In some embodiments of this application, at least one of the first heat exchanger 311, the second heat exchanger 312, and the third heat exchanger 331 includes a medium flow channel for accommodating the heat exchange medium.

[0189] Specifically, by providing a medium flow channel on at least one of the first heat exchanger 311, the second heat exchanger 312, and the third heat exchanger 331, the heat exchange medium is used to exchange heat with the battery, which can improve the heat exchange efficiency of the battery cell 20 and effectively enhance the heat exchange effect.

[0190] In some embodiments of this application, such as Figure 10 or Figure 12 As shown, the first heat exchanger 311, the second heat exchanger 312 and the third heat exchanger 331 all include a medium flow channel. The heat exchange assembly 30 also includes a flow collector 32, which is connected to the medium flow channel of the first heat exchanger 311, the medium flow channel of the second heat exchanger 312 and the medium flow channel of the third heat exchanger 331, respectively.

[0191] Specifically, in this application, the first heat exchange section 31 and the second heat exchange section 33 are respectively connected to the current collector 32, and the current collector 32 is connected to the external cooling system. The heat exchange medium flows into the first heat exchange section 31 and the second heat exchange section 33 through the current collector 32. The heat exchange medium after the first heat exchange section 31 and the second heat exchange section 33 exchange heat with the battery cell 20 flows back to the cooling system through the current collector 32.

[0192] By setting up the manifold 32, the first heat exchange section 31 and the second heat exchange section 33 are connected to the external cooling system, so that the coolant can use the manifold 32 to connect the first heat exchange section 311, the second heat exchange section 312 and the third heat exchange section 331, thereby facilitating the unified layout of the heat exchange components 30 and improving the ease of assembly.

[0193] In some embodiments of this application, the battery cell 20 further includes a pressure relief mechanism 23. The pressure relief mechanism 23 is disposed on the first sidewall 21 and spaced apart from the electrode terminals 22 and the first heat exchange portion 31 respectively (e.g., Figure 8 (as shown), or the pressure relief mechanism 23 is located on one of the multiple side walls (e.g. Figure 5 As shown), the pressure relief mechanism 23 and the electrode terminal 22 are located on different side walls.

[0194] Specifically, setting up a pressure relief mechanism 23 can improve the safety performance of the battery cell 20, thereby enhancing the safety performance of the battery device. In addition, by setting the position of the pressure relief mechanism 23, the application scenarios of the battery device can be expanded.

[0195] In some embodiments of this application, such as Figures 6 to 8 As shown, the pressure relief mechanism 23 is disposed on the first side wall 21. The electrode terminal 22 includes a first electrode terminal 221 and a second electrode terminal 222 disposed at intervals. The first electrode terminal 221 and the second electrode terminal 222 are respectively disposed at intervals on opposite sides of the pressure relief mechanism 23. The center distance between the first electrode terminal 221 and the second electrode terminal 222 is in the range of 50 mm to 200 mm.

[0196] Specifically, the first heat exchange section 31, the pressure relief mechanism 23, the first electrode terminal 221, and the second electrode terminal 222 are disposed on the same side of the battery cell 20, and are arranged in the same direction. The pressure relief mechanism 23 is disposed between the first electrode terminal and the second electrode terminal 222, and the first heat exchange section 31 is disposed at intervals outside the first electrode terminal 221 and the second electrode terminal 222.

[0197] By the center distance between the first electrode terminal 221 and the second electrode terminal 222 (i.e. Figure 8 The second center distance b) shown is set in the range of 50 mm to 200 mm, which allows the first sidewall 21 to provide more space for the first heat exchange part 31, thereby increasing the contact area between the first heat exchange part 31 and the first sidewall 21, and thus improving the heat exchange efficiency of the first heat exchange part 31 to the battery cell 20.

[0198] It should be noted that the specific value of the second center distance b (the center distance between the first electrode terminal 221 and the second electrode terminal 222) can be 50 mm, 65 mm, 75 mm, 85 mm, 95 mm, 105 mm, 115 mm, 125 mm, 135 mm, 145 mm, 155 mm, 165 mm, 175 mm, 185 mm, 195 mm, or 200 mm.

[0199] In some embodiments of this application, such as Figures 6 to 8 As shown, the center distance between the first electrode terminal 221 and the second electrode terminal 222 is in the range of 60 mm to 100 mm.

[0200] Specifically, the center distance between the first electrode terminal 221 and the second electrode terminal 222 (i.e. Figure 8 The second center distance b) shown is in the range of 60 mm to 100 mm. By further controlling the distance between the first electrode terminal 221 and the second electrode terminal 222, the space outside the first sidewall 21 located outside the first electrode terminal 221 and the second electrode terminal 222 can be increased to increase the contact area between the first heat exchange part 31 and the first sidewall 21, thereby improving the heat exchange efficiency of the first heat exchange part 31 to the battery cell 20.

[0201] It should be noted that the specific value of the second center distance b (the center distance between the first electrode terminal 221 and the second electrode terminal 222) can be 60 mm, 70 mm, 80 mm, 90 mm, or 100 mm.

[0202] In some embodiments of this application, such as Figures 3 to 5 As shown, the pressure relief mechanism 23 is disposed on one of the multiple sidewalls, and the pressure relief mechanism 23 and the electrode terminal 22 are disposed on different sidewalls. The electrode terminal 22 includes a first electrode terminal 221 and a second electrode terminal 222 disposed at intervals. The center distance between the first electrode terminal 221 and the second electrode terminal 222 is (i.e., Figure 5 The first center distance shown is in the range of 30 mm to 200 mm.

[0203] Specifically, the first heat exchange section 31, the first electrode terminal 221, and the second electrode terminal 222 are disposed on the same side of the battery cell 20, and are arranged in the same direction. The pressure relief mechanism 23 is disposed between the first electronic terminal and the second electrode terminal 222, and the first heat exchange section 31 is disposed at intervals outside the first electrode terminal 221 and the second electrode terminal 222.

[0204] By the center distance between the first electrode terminal 221 and the second electrode terminal 222 (i.e. Figure 5 The first center distance a) shown is set in the range of 30 mm to 200 mm. Without adversely affecting the first electrode terminal 221, the second electrode terminal 222 and the pressure relief mechanism 23, the first sidewall 21 can provide more space for the first heat exchange part 31, thereby increasing the contact area between the first heat exchange part 31 and the first sidewall 21, and thus improving the heat exchange efficiency of the first heat exchange part 31 to the battery cell 20.

[0205] It should be noted that the specific value of the first center distance a (the center distance between the first electrode terminal 221 and the second electrode terminal 222) can be 30 mm, 35 mm, 45 mm, 55 mm, 65 mm, 75 mm, 85 mm, 95 mm, 105 mm, 115 mm, 125 mm, 135 mm, 145 mm, 155 mm, 165 mm, 175 mm, 185 mm, 195 mm, or 200 mm.

[0206] In some embodiments of this application, such as Figures 3 to 5 As shown, the center distance between the first electrode terminal 221 and the second electrode terminal 222 is in the range of 40 mm to 80 mm.

[0207] Specifically, the center distance between the first electrode terminal 221 and the second electrode terminal 222 (i.e. Figure 5 The first center distance a) shown is in the range of 40 mm to 80 mm. By further controlling the distance between the first electrode terminal 221 and the second electrode terminal 222, the space outside the first sidewall 21 located outside the first electrode terminal 221 and the second electrode terminal 222 can be increased to increase the contact area between the first heat exchange part 31 and the first sidewall 21, thereby improving the heat exchange efficiency of the first heat exchange part 31 to the battery cell 20.

[0208] It should be noted that the specific value of the first center distance a (the center distance between the first electrode terminal 221 and the second electrode terminal 222) can be 40 mm, 50 mm, 60 mm, 70 mm, or 80 mm.

[0209] like Figures 1 to 12 As shown, a second aspect of this application provides an electrical device that includes the battery device described above.

[0210] In the battery device of this electrical equipment, the electrode terminals 22 of the battery cell 20 occupy space inside the housing 10. By placing the first heat exchange part 31 on the same side as the electrode terminals 22 of the battery cell 20 and placing the first heat exchange part 31 in the space occupied by the electrode terminals 22, the situation where the first heat exchange part 31 occupies the space of the housing 10 alone is reduced, thereby making the structure inside the housing 10 more compact and improving the space utilization rate of the housing 10.

[0211] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0212] In the embodiments of this application, such as Figures 2 to 12As shown, this application proposes a battery device, which includes a housing 10, a plurality of battery cells 20, and a heat exchange assembly 30. The plurality of battery cells 20 are arranged in an array within the housing 10. Each battery cell 20 includes a plurality of sidewalls and electrode terminals 22. The plurality of sidewalls includes a first sidewall 21, and the electrode terminals 22 are disposed on the first sidewall 21. All electrode terminals 22 of the plurality of battery cells 20 have the same orientation. The heat exchange assembly 30 includes a first heat exchange portion 31, which is located on the same side as the electrode terminals 22. The first heat exchange portion 31 is connected to the first sidewall 21 of the battery cell 20 and can exchange heat with the battery cell 20. On the same battery cell 20, the first heat exchange portion 31 is disposed further away from the center position p of the first sidewall 21 than the electrode terminals 22. In a preset direction, the first heat exchange portion 31 is spaced apart on the side of the electrode terminals 22 away from the center position p. The preset direction is parallel to the first sidewall 22.

[0213] In this application, the electrode terminals 22 of the battery cell 20 occupy space inside the housing 10. The first heat exchange part 31 is placed on the same side as the electrode terminals 22 of the battery cell 20. The first heat exchange part 31 is placed in the space occupied by the electrode terminals 22, which reduces the situation where the first heat exchange part 31 occupies the space of the housing 10 alone. As a result, the structure inside the housing 10 is more compact, and the space utilization rate of the housing 10 is improved.

[0214] Furthermore, along the height direction Z of the housing 10, the interior of the housing 10 includes an inner bottom surface 121 and an inner top surface that are disposed opposite to each other. The electrode terminals 22 are disposed facing either the inner bottom surface 121 or the inner top surface.

[0215] Furthermore, the array structure is a rectangular array structure, which includes a first array direction X and a second array direction Y that are perpendicular to each other. In the first array direction X, the rectangular array structure includes multiple rows, each row including multiple battery cells 20. In the second array direction Y, the rectangular array structure includes multiple columns, each column including multiple battery cells 20. One of the first array direction X and the second array direction Y is the length direction of the housing 10, and the other is the width direction of the housing 10.

[0216] Furthermore, the first heat exchange section 31 includes a plurality of first heat exchange elements 311, which are spaced apart along the first array direction X. Each first heat exchange element 311 is arranged along the second array direction Y. All the battery cells 20 in two adjacent rows are connected to the same first heat exchange element 311. The first heat exchange section 31 also includes a second heat exchange element 312. Along the first array direction X, at least one side of the plurality of first heat exchange elements 311 is provided with a second heat exchange element 312. The second heat exchange element 312 and the adjacent first heat exchange elements 311 are located on opposite sides of the electrode terminals 22 of the same battery cell 20. In the rectangular array structure, all the battery cells 20 in the outermost row are thermally connected to the same second heat exchange element 312.

[0217] Furthermore, along the first array direction X, the first heat exchanger 311 includes a first maximum dimension e, and the second heat exchanger 312 includes a second maximum dimension f, the second maximum dimension f being equal to half of the first maximum dimension e.

[0218] Furthermore, the heat exchange assembly 30 also includes a second heat exchange section 33, which includes a plurality of third heat exchange elements 331. At least one third heat exchange element 331 is provided between two adjacent battery cells 20, and the third heat exchange element 331 is thermally connected to the two adjacent battery cells 20.

[0219] Furthermore, the third heat exchanger 331 is arranged along the first array direction X, and in two adjacent columns, at least some of the battery cells 20 are thermally connected to the third heat exchanger 331.

[0220] In some examples of this embodiment, the multiple sidewalls also include a second sidewall, which is intersecting with the first sidewall 21. Among the multiple sidewalls, the second sidewall has the largest area and is thermally connected to the third heat exchanger 331. The third heat exchanger 331 is arranged along the second array direction Y, and at least a portion of the battery cells 20 in two adjacent rows are thermally connected to the third heat exchanger 331.

[0221] In some examples of this embodiment, the multiple sidewalls also include a second sidewall and a third sidewall, which are respectively intersecting with the first sidewall 21. Among the multiple sidewalls, the second sidewall has the largest area, and the third sidewall is thermally connected to the third heat exchanger 331.

[0222] Furthermore, the first heat exchanger 311 is a first plate-shaped component, the thickness direction of which is consistent with the height direction Z of the housing 10; the second heat exchanger 312 is a second plate-shaped component, the thickness direction of which is consistent with the height direction Z of the housing 10; and the third heat exchanger 331 is a third plate-shaped component, the arrangement direction of the two adjacent battery cells 20 that are thermally connected to the third heat exchanger 331 is consistent with the thickness direction of the third plate-shaped component.

[0223] Furthermore, the first heat exchanger 311, the second heat exchanger 312 and the third heat exchanger 331 all include a medium flow channel, and the heat exchange assembly 30 also includes a flow collector 32, which is connected to the medium flow channel of the first heat exchanger 311, the medium flow channel of the second heat exchanger 312 and the medium flow channel of the third heat exchanger 331 respectively.

[0224] In some examples of this embodiment, the battery cell 20 further includes a pressure relief mechanism 23, which is disposed on the first sidewall 21. The electrode terminal 22 includes a first electrode terminal 221 and a second electrode terminal 222 disposed at intervals. The first electrode terminal 221 and the second electrode terminal 222 are respectively disposed at intervals on opposite sides of the pressure relief mechanism 23. The center distance between the first electrode terminal 221 and the second electrode terminal 222 is in the range of 60 mm to 100 mm.

[0225] In some examples of this embodiment, the battery cell 20 further includes a pressure relief mechanism 23, which is disposed on one of the plurality of sidewalls and on different sidewalls from the electrode terminals 22. The electrode terminals 22 include a first electrode terminal 221 and a second electrode terminal 222 disposed at intervals, and the center distance between the first electrode terminal 221 and the second electrode terminal 222 is in the range of 40 mm to 80 mm.

[0226] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, The battery device includes: Box; Multiple battery cells are arranged in an array within the housing. Each battery cell includes electrode terminals and multiple sidewalls. The multiple sidewalls include a first sidewall, and the electrode terminals are disposed on the first sidewall. All the electrode terminals of the multiple battery cells have the same orientation. A heat exchange assembly includes a first heat exchange portion located on the same side as the electrode terminal. The first heat exchange portion is connected to the first sidewall of the battery cell and is capable of exchanging heat with the battery cell. On the same battery cell, the first heat exchange portion is located further away from the center of the first sidewall than the electrode terminal. In a preset direction, the first heat exchange portion is spaced apart on the side of the electrode terminal opposite to the center position. The preset direction is parallel to the first sidewall.

2. The battery device as claimed in claim 1, characterized in that, Along the height direction of the box, the interior of the box includes an inner bottom surface and an inner top surface that are disposed opposite to each other; The electrode terminals are positioned facing the inner bottom surface or the electrode terminals are positioned facing the inner top surface.

3. The battery device as claimed in claim 2, characterized in that, The array structure is a rectangular array structure, which includes a first array direction and a second array direction that are perpendicular to each other. In the first array direction, the rectangular array structure includes multiple rows, and each row includes multiple battery cells. In the second array direction, the rectangular array structure includes multiple columns, and each column includes multiple battery cells. The first array direction and the second array direction are the length direction of the housing and the other is the width direction of the housing.

4. The battery device as claimed in claim 3, characterized in that, The first heat exchange section includes a plurality of first heat exchange elements, which are arranged at intervals along the first array direction. Each first heat exchange element is arranged along the second array direction, and at least a portion of the battery cells in two adjacent rows are respectively connected to the same first heat exchange element.

5. The battery device as claimed in claim 3, characterized in that, The first heat exchange portion further includes a second heat exchange element. Along the first array direction, at least one side of the plurality of first heat exchange elements is provided with the second heat exchange element, and the second heat exchange element and the adjacent first heat exchange element are located on opposite sides of the electrode terminals of the same battery cell. In the rectangular array structure, at least a portion of the battery cells in the outermost row are thermally connected to the same second heat exchange element.

6. The battery device as claimed in claim 5, characterized in that, Along the first array direction, the first heat exchanger includes a first maximum size, and the second heat exchanger includes a second maximum size, wherein the second maximum size is greater than zero and less than or equal to half of the first maximum size.

7. The battery device as claimed in claim 5, characterized in that, The heat exchange assembly further includes a second heat exchange section, which includes a plurality of third heat exchange elements. At least one third heat exchange element is provided between two adjacent battery cells, and the third heat exchange element is thermally connected to the two adjacent battery cells.

8. The battery device as claimed in claim 7, characterized in that, The third heat exchanger is arranged along the direction of the first array, and in two adjacent columns, at least some of the battery cells are thermally connected to the third heat exchanger.

9. The battery device as claimed in claim 8, characterized in that, The plurality of sidewalls also includes a second sidewall, which is intersecting with the first sidewall. Among the plurality of sidewalls, the second sidewall has the largest area and is thermally connected to the third heat exchanger.

10. The battery device as claimed in claim 7, characterized in that, The third heat exchanger is arranged along the direction of the second array, and at least a portion of the battery cells in two adjacent rows are thermally connected to the third heat exchanger.

11. The battery device as claimed in claim 10, characterized in that, The plurality of sidewalls further includes a second sidewall and a third sidewall, the second sidewall and the third sidewall being respectively intersecting with the first sidewall. Among the plurality of sidewalls, the second sidewall is the sidewall with the largest area, and the third sidewall is thermally connected to the third heat exchanger.

12. The battery device as claimed in claim 7, characterized in that, The first heat exchanger is a first plate-shaped component, and the thickness direction of the first plate-shaped component is consistent with the height direction of the box body; And / or, the second heat exchanger is a second plate-shaped member, the thickness direction of the second plate-shaped member being consistent with the height direction of the housing; And / or, the third heat exchanger is a third plate-shaped member, and the arrangement direction of the two adjacent battery cells that are thermally connected to the third heat exchanger is consistent with the thickness direction of the third plate-shaped member.

13. The battery device as claimed in claim 7, characterized in that, At least one of the first heat exchanger, the second heat exchanger, and the third heat exchanger includes a medium flow channel for containing a heat exchange medium.

14. The battery device as claimed in claim 13, characterized in that, The first heat exchanger, the second heat exchanger, and the third heat exchanger all include a medium flow channel. The heat exchange assembly also includes a flow collector, which is connected to the medium flow channel of the first heat exchanger, the medium flow channel of the second heat exchanger, and the medium flow channel of the third heat exchanger, respectively.

15. The battery device according to any one of claims 1 to 14, characterized in that, The battery cell also includes a pressure relief mechanism; The pressure relief mechanism is disposed on the first sidewall and spaced apart from the electrode terminal and the first heat exchange portion, respectively; or the pressure relief mechanism is disposed on one of the plurality of sidewalls and the pressure relief mechanism and the electrode terminal are disposed on different sidewalls.

16. The battery device as claimed in claim 15, characterized in that, The pressure relief mechanism is disposed on the first side wall. The electrode terminals include a first electrode terminal and a second electrode terminal that are spaced apart. The first electrode terminal and the second electrode terminal are respectively spaced apart on opposite sides of the pressure relief mechanism. The center distance between the first electrode terminal and the second electrode terminal is in the range of 50 mm to 200 mm.

17. The battery device as claimed in claim 16, characterized in that, The center distance between the first electrode terminal and the second electrode terminal is in the range of 60 mm to 100 mm.

18. The battery device as claimed in claim 15, characterized in that, The pressure relief mechanism is located on one of the plurality of sidewalls, and the pressure relief mechanism and the electrode terminals are located on different sidewalls. The electrode terminals include a first electrode terminal and a second electrode terminal that are spaced apart, and the center distance between the first electrode terminal and the second electrode terminal is in the range of 30 mm to 200 mm.

19. The battery device as claimed in claim 18, characterized in that, The center distance between the first electrode terminal and the second electrode terminal is in the range of 40 mm to 80 mm.

20. An electrical appliance, characterized in that, The electrical equipment includes the battery device according to claim 19.

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