Battery device and electric equipment

Abstract

The invention discloses a battery device and electric equipment. The battery device comprises a box body, a battery cell assembly and a heat management part. Wherein the box body is provided with a containing space, and the box body comprises a limiting beam. The battery monomer assembly is arranged in the accommodating space, limiting beams are respectively arranged on two sides of the battery monomer assembly along the first direction, and the battery monomer assembly comprises a plurality of battery monomers. The heat management part is arranged in the accommodating space and comprises a plurality of heat exchange parts, the plurality of heat exchange parts are arranged along a second direction, a battery monomer is connected between two adjacent heat exchange parts in a heat conduction manner, the heat exchange parts are respectively connected with limiting beams positioned on two sides of the battery monomer along a first direction, and the first direction is intersected with the second direction; the common plane of the first direction and the second direction intersects with the height direction of the box body.

Description

Technical Field

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

[0002] During the cyclic charging and discharging process, the battery casing is subjected to repeated expansion forces, causing the casing to bear cyclic loads for a long time. This leads to a decrease in the strength of the casing, making it prone to cracking, severe deformation, and other problems. Summary of the Invention

[0003] In view of the above problems, this application provides a battery device and electrical equipment, which can improve the strength of the limiting beam by connecting the current collector to the limiting beam, thereby enhancing the limiting beam's ability to resist the expansion force of the battery cells and thus improving the strength of the casing.

[0004] In a first aspect, this application provides a battery device, comprising: The box-shaped structure has a storage space and includes a limiting beam. A battery cell assembly is disposed within an accommodating space. The battery cell assembly is provided with limiting beams on both sides along the first direction. The battery cell assembly includes multiple battery cells. A thermal management component is located within an accommodating space. The thermal management component includes multiple heat exchange elements arranged along a second direction. A battery cell is disposed between two adjacent heat exchange elements. The first direction and the second direction intersect. The plane containing both the first and second directions intersects with the height direction of the housing. The heat exchanger includes a collector and a body. The two ends of the body are connected to collectors in a first direction. The body has a heat exchange channel inside. The collector at one end of the body in the first direction is configured to supply heat exchange medium into the heat exchange channel. The collector at the other end of the body in the first direction is configured to discharge the heat exchange medium from the heat exchange channel. Along the first direction, there are limiting beams on both sides of the heat exchanger, namely a first limiting beam and a second limiting beam. The first limiting beam is connected to the collector at one end of the body, and the second limiting beam is connected to the collector at the other end of the body.

[0005] The battery device of this application places the current collectors at both ends of the main body along the first direction, which facilitates the connection between multiple heat exchange components. At the same time, the current collector of each heat exchange component is connected to the limiting beam, which helps to improve the strength of the limiting beam, thereby improving the ability of the limiting beam to resist the expansion force of the battery cell, and helping to improve the overall strength and rigidity of the housing.

[0006] In some embodiments, the current collector includes a first part and a second part, the first part extending along the height direction of the housing, the second part extending along a second direction, and the first part and the second part being connected. The main body includes a first heat exchange plate and a second heat exchange plate. Both the first heat exchange plate and the second heat exchange plate have heat exchange channels inside. The first part is connected to the first heat exchange plate, and the second part is connected to the second heat exchange plate. At least one of the first part and the second part is connected to a limiting beam.

[0007] The first and second heat exchange plates intersect and are connected to each other, which can increase the rigidity and strength of the main body, thereby improving the ability of the limiting beam to resist the expansion force of the battery cells and reducing the deformation of the box. At the same time, the first and second heat exchange plates can also exchange heat with both sides of the battery cells to improve the heat exchange effect between the thermal management components and the battery cells.

[0008] In some embodiments, the current collector and the limiting beam are connected by welding.

[0009] Compared to detachable connections, fixing the manifold to the limiting beam by welding can prevent loosening and noise / wear between the limiting beam and the manifold in vibration environments. This reduces the possibility of leakage caused by mutual wear between the manifold and the limiting beam due to loosening, thus improving operational reliability.

[0010] In some embodiments, along the second direction, chamfers are provided at the locations where the two sides of the current collector intersect with the sidewalls of the limiting beam, and the chamfers are filled with welds.

[0011] The chamfering design reduces the size of the weld protruding from the chamfer, thus reducing excessive compression of the battery cell during expansion. This reduces the deformation of the battery cell and lowers the risk of short circuits caused by damage to the battery cell due to excessive compression of the battery cell by the weld, thereby improving the safety of the battery cell.

[0012] In some embodiments, the wall of the limiting beam facing the battery cell has a groove, with one groove corresponding to each current collector, and the groove is used to accommodate at least a portion of the current collector.

[0013] The groove design provides positioning for the installation of the current collector and the limiting beam, preventing excessive offset of the current collector from causing narrow space between two adjacent heat exchange components, thus facilitating the installation of battery cells.

[0014] In some embodiments, the current collector has a protrusion extending along the first direction, a first portion protruding from a second portion along the first direction, and a groove accommodating at least a portion of the protrusion.

[0015] This allows the protruding part of the current collector to be easily inserted into the groove, facilitating the positioning of the current collector and reducing the amount of space occupied by the first part in the housing. This improves the space utilization of the housing and, consequently, increases the volumetric energy density of the battery device.

[0016] In some embodiments, the limiting beam has a cavity, the groove is connected to the cavity, and the collectors of two adjacent heat exchangers are connected in series or in parallel by pipelines, with some pipelines located in the cavity.

[0017] If the piping is directly placed within the enclosure, it will occupy additional space, reducing the space utilization of the enclosure and consequently affecting the volumetric energy density of the battery device. However, by incorporating a chamber within the limiting beam and placing the piping connecting adjacent current collectors within this chamber, the internal space of the limiting beam itself can be fully utilized, reducing the space occupied by the piping. This improved space utilization allows for the placement of larger battery cells within the limited space, thus increasing the volumetric energy density of the battery device. Furthermore, placing the piping within the chamber reduces the risk of compression during battery cell expansion, ensuring the stability of the piping connection.

[0018] In some embodiments, the groove extends through the top of the wall.

[0019] Installation is completed by inserting the manifold into the groove from the top and placing the piping inside the chamber. However, if the groove does not extend to the top of the wall, the manifold must be installed in the groove first, and then the piping connected inside the chamber. This is inconvenient due to the limited space inside the chamber. Therefore, extending the groove to the top of the wall facilitates the installation of both the piping and the manifold.

[0020] In some embodiments, the current collectors at both ends of the body portion along the first direction are a first current collector and a second current collector, respectively, and along the second direction, the size of the protrusion of the first current collector and the size of the protrusion of the second current collector are equal.

[0021] Since the protrusions of the first and second current collectors are of equal size, their positions can be interchanged during installation to facilitate insertion into the grooves, thus improving the ease of installation.

[0022] In some embodiments, the current collectors at both ends of the body portion along the first direction are configured to be connected to any one of the limiting beams.

[0023] If the manifold can only be connected to a specific limiting beam, it increases the difficulty of positioning during assembly and is prone to assembly errors. Configuring the manifold to connect to any limiting beam achieves its versatility, eliminating the need to strictly distinguish the installation orientation of the two manifolds during assembly, thus reducing assembly difficulty and errors.

[0024] In some embodiments, the body includes a first heat exchange plate, and the battery cell is thermally connected to the first heat exchange plate on both sides along the second direction. The first heat exchange plate has a receiving cavity and a first guide rib and a plurality of second guide ribs respectively disposed in the receiving cavity. The receiving cavity extends through both ends of the first heat exchange plate along the first direction. The two ends of the first heat exchange plate along the first direction are respectively connected to current collectors. The first guide rib is located on one side of the second guide rib along the first direction. The plurality of second guide ribs are spaced apart along the height direction of the housing and extend along the first direction. The heat exchange channel includes a first heat exchange channel. The first guide rib, the plurality of second guide ribs, the wall of the receiving cavity and the current collector together form a bent first heat exchange channel.

[0025] The cyclic charging and discharging of a single battery cell generates a large amount of heat. If the heat exchange channel is a direct current channel, the heat exchange medium flows through quickly, the heat exchange time is short, and the heat exchange efficiency is low, which can easily lead to excessively high battery cell temperatures and affect battery performance. The first heat exchange plate is designed with a bent first heat exchange channel, which can extend the flow path and residence time of the heat exchange medium within the heat exchange plate, increase the contact area between the heat exchange medium and the first heat exchange plate, and improve heat exchange efficiency. Simultaneously, the first and second guide ribs can improve the structural rigidity of the first heat exchange plate, enabling it to efficiently dissipate heat from the battery cells, provide more stable rigid support for the limiting beam through the current collectors at both ends, and prevent the first heat exchange channel from deforming under the pressure of the battery cells.

[0026] In some embodiments, the body portion further includes a second heat exchange plate, the first heat exchange plate and the second heat exchange plate intersect and are connected to each other, the second heat exchange plate is disposed on one side of the battery cell and is thermally connected to the battery cell along the height direction of the housing, the heat exchange channel includes a second heat exchange channel, the interior of the second heat exchange plate has a second heat exchange channel, and the first heat exchange channel is connected to the second heat exchange channel.

[0027] A second heat exchange plate is added and intersected with the first heat exchange plate. The second heat exchange plate is thermally connected to the battery cell along the height of the housing, which can achieve heat dissipation on the side and bottom surface, or the side or top surface of the battery cell. The first heat exchange channel and the second heat exchange channel are connected, so that the heat exchange medium can flow through the two heat exchange plates at the same time, ensuring heat dissipation uniformity and reducing local overheating of the battery cell. At the same time, the connection between the second heat exchange plate and the first heat exchange plate can further enhance the overall structural rigidity of the heat exchange component.

[0028] In some embodiments, the two heat exchangers that are furthest apart along the second direction are the first heat exchangers, and the heat exchanger between the two first heat exchangers is the second heat exchanger. In the same first heat exchanger, the side of the first heat exchange plate facing away from the battery cell is flush with the end of the second heat exchange plate facing away from the battery cell.

[0029] Therefore, the two heat exchangers furthest along the second direction can be configured in this structure. On the one hand, this increases the area of ​​thermal connection between the second heat exchange plate and the battery cell, thereby improving the heat exchange effect. On the other hand, compared with the first heat exchange plate being located between the two ends of the second heat exchange plate along the second direction, this improves the space utilization of the housing. That is, within a limited space, the distance between the first heat exchange plates of the two heat exchangers furthest along the second direction is increased, so that larger battery cells can be accommodated, which is beneficial to improving the volumetric energy density of the battery device.

[0030] In some embodiments, the two heat exchangers that are furthest apart along the second direction are the first heat exchangers, and the heat exchanger between the two first heat exchangers is the second heat exchanger. In the same second heat exchanger, along the second direction, both sides of the first heat exchange plate are spaced apart from the two ends of the second heat exchange plate along the second direction.

[0031] This allows for the same battery cell to be thermally connected to the second heat exchange plate of two heat exchange components, thereby increasing the heat exchange area and improving the heat exchange effect.

[0032] In some embodiments, the housing includes mounting beams for mounting battery devices, with mounting beams provided on both sides of the battery cell assembly along a second direction, and a first heat exchanger connected to the mounting beams.

[0033] This improves the strength and rigidity of the enclosure, which in turn enhances its protective performance against individual battery cells.

[0034] In some embodiments, the second heat exchange plate of each heat exchanger forms the bottom wall of the housing.

[0035] The second heat exchange plate forms the bottom wall of the housing. Compared with the existing technology where the water-cooling plate is installed on the bottom wall of the housing, the thickness of the bottom wall of the housing can be reduced. Under the premise that the height of the housing remains unchanged, the housing can be enlarged to accommodate larger battery cells, thereby improving the volumetric energy density of the battery device.

[0036] In some embodiments, the battery cell has a first side and a second side, the area of ​​the first side is larger than the area of ​​the second side, and the first side faces the limiting beam.

[0037] The expansion amount on the first side is relatively large. Since the first side faces the limiting beam, the limiting beam can absorb a large amount of expansion, thereby reducing the deformation of the box and improving the reliability of the battery device.

[0038] Secondly, this application provides an electrical device, including the battery device of the first aspect, which is used to provide electrical energy to the electrical device.

[0039] Since the electrical equipment includes all the technical features of the battery device in the first aspect, and its effect is the same as described above, it will not be repeated here.

[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] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram of the structure of an electrical device, specifically a vehicle, according to some embodiments of this application. Figure 2 This is an exploded view of a battery device according to some embodiments of this application; Figure 3 This is a top view of a battery device according to some embodiments of this application; Figure 4 This is a partial cross-sectional view of a battery device according to some embodiments of this application, perpendicular to the height direction and passing through the pipeline axis; Figure 5 This is an isometric view of a heat exchange component of a battery device according to some embodiments of this application; Figure 6 This is a perspective view of the internal structure of a heat exchanger in a battery device according to some embodiments of this application; Figure 7 for Figure 6 A magnified view of a portion of point I; Figure 8 This is a structural diagram of a heat exchanger component of a battery device according to some embodiments of this application; Figure 9 for Figure 8 AA section view; Figure 10 for Figure 8 BB section view; Figure 11 This is a top view of a heat exchange component of a battery device according to some embodiments of this application; Figure 12 for Figure 11 CC section view.

[0042] The reference numerals in the detailed embodiments are as follows: 1000, vehicle; 200, controller; 300, motor; 100. Battery device; 110. Box body; 111. Limiting beam; 1111. Groove; 1112. Chamber; 112. Mounting beam; 120. Battery cell assembly; 121. Battery cell; 1211. First side surface; 1212. Second side surface; 130. Thermal management component; 131. Heat exchanger; 1311. Current collector; 13111. First part; 13112. Second part; 13113. Protrusion; 1312. First heat exchange plate; 13121. First guide rib; 13122. Second guide rib; 13123. First heat exchange channel; 131231. First channel; 131232. Second channel; 131233. Third channel; 1313. Second heat exchange plate; 13131. Support rib; 13132. Second heat exchange channel; 132. Piping; 133. Weld; X, first direction; Y, second direction; Z, altitude direction. Detailed Implementation

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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).

[0049] 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.

[0050] 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.

[0051] During charge and discharge cycles, battery cells repeatedly expand and contract. Since the limiting beam of the battery box is a component that absorbs the expansion of the battery cells, when the expansion of the battery cells is large, it will cause large deformation of the limiting beam, which in turn will cause deformation of the box. Some components of the box may experience connection failure, such as weld breakage, which reduces the protection of the box for the battery cells.

[0052] In view of this, this application provides a battery device that connects the heat exchange component of the thermal management component to the limiting beam of the housing. By utilizing the structural rigidity of the heat exchange component itself, the structural strength of the limiting beam is enhanced, thereby increasing the limiting beam's ability to resist expansion and preventing excessive expansion of the battery cells, which would shorten the service life of the battery cells. This is beneficial to improving the overall strength and rigidity of the housing.

[0053] 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.

[0054] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0055] 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.

[0056] 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.

[0057] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0058] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0059] 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 house the battery cell assembly.

[0060] 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.

[0061] 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.

[0062] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices, such as electric vehicles, cars, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0063] In some embodiments, 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.

[0064] 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.

[0065] A single battery cell typically includes an electrode assembly. 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 while allowing active ions to pass through.

[0066] 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.

[0067] 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.

[0068] 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. A composite current collector may include a polymer base layer and a metal layer. A composite current collector can be formed by forming metal materials such as aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys on a polymer base material such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene.

[0069] 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, lithium iron phosphate (such as LiFePO4). 4， It can also be abbreviated as LFP), lithium iron phosphate and carbon composite materials, lithium manganese phosphate (such as LiMnPO4), etc. 4） At least one of lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxides (such as LiCoO2). 2） Lithium nickel oxides (such as LiNiO) 2） Lithium manganese oxides (such as LiMnO2, LiMn2O) 4）Lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi) 1 / 3 Co 1 / 3 Mn 1 / 3 O 2， It can also be abbreviated as NCM 333 LiNi 0.5 Co 0.2 Mn 0.3 O 2， It can also be abbreviated as NCM 523 LiNi 0.5 Co 0.25 Mn 0.25 O 2， It can also be abbreviated as NCM 211 LiNi 0.6 Co 0.2 Mn 0.2 O 2， It can also be abbreviated as NCM 622 LiNi 0.8 Co 0.1 Mn 0.1 O 2， It can also be abbreviated as NCM 811） Lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 O 2） At least one of the above-mentioned substances and their modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0070] 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.

[0071] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0072] 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 instance, the metal foil can be a pure metal, an alloy, or a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. A composite current collector may include a polymer substrate and a metal layer. Composite current collectors can be formed by depositing metallic materials such as copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys onto a polymer substrate such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0078] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0079] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0080] 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.

[0081] 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 ceramics. 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.

[0082] 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.

[0083] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0084] Liquid electrolytes include electrolyte salts and solvents.

[0085] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0086] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent, which may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0087] In some embodiments, the electrolyte may optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high-temperature performance of the battery cell, and additives that improve the low-temperature performance of the battery cell.

[0088] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid – lithium salt.

[0089] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0090] As an example, the polymers of polymeric solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0091] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor lithium germanium phosphosulfur, silver sulfide germanium ore, amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0092] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0093] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0094] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0095] In some embodiments, the electrode assembly has a stacked structure.

[0096] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0097] 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.

[0098] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0099] As an example, multiple separators can be provided, each positioned between any adjacent positive and negative electrode plates.

[0100] As an example, the separator can be continuously arranged between any adjacent positive and negative electrode plates by folding or rolling.

[0101] In some embodiments, the electrode assembly may be cylindrical, flat, or polygonal in shape.

[0102] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0103] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), or a composite metal casing (such as a copper-aluminum composite casing), etc. In some embodiments, the casing may be a sealed structure or an unsealed structure.

[0104] As an example, the battery cell can be a cylindrical battery cell, a prismatic 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.

[0105] In some embodiments, the housing includes an end cap and a housing, the housing having an opening and the end cap covering the opening. The housing may have one or more openings, and the end cap may also have one or more.

[0106] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0107] In some embodiments, a pressure relief mechanism is provided on the housing. The pressure relief mechanism is used to release the internal gas of the battery cell.

[0108] As an example, when the internal pressure or temperature of a battery cell reaches a predetermined threshold, a pressure relief mechanism is activated to release the internal pressure or temperature. When the internal pressure or temperature of a battery cell reaches the predetermined threshold, the pressure relief mechanism performs its action, or a weak structure within the pressure relief mechanism is damaged, thereby creating an opening or channel for the release of internal pressure or temperature. This threshold design varies depending on design requirements and may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell.

[0109] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0110] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0111] 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. When the pressure relief mechanism is activated, the high-temperature, high-pressure substances inside the battery cell are discharged as waste from the activated portion. This method allows for pressure and temperature relief of the battery cell under controllable pressure or temperature, thereby preventing potentially more serious accidents.

[0112] 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.

[0113] 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.

[0114] For ease of explanation, the following embodiments use an electrical device from some embodiments of this application as an example.

[0115] The electrical equipment includes a battery device 100 according to various embodiments, which is used to provide electrical energy to the electrical equipment.

[0116] Electrical equipment can include, but is not limited to, electric vehicles, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0117] Figure 1 This is a schematic diagram of the structure of a vehicle 1000, used as the electrical device in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0118] For ease of explanation, the following embodiments use a battery device 100 from some embodiments of this application as an example.

[0119] Please refer to Figure 2 and Figure 3The battery device 100 includes a housing 110, a battery cell assembly 120, and a thermal management component 130. The housing 110 has an accommodating space and includes limiting beams 111. The battery cell assembly 120 is disposed within the accommodating space, and the battery cell assembly 120 has limiting beams 111 on both sides along a first direction X. The battery cell assembly 120 includes multiple battery cells 121. The thermal management component 130 is disposed within the accommodating space and includes multiple heat exchange elements 131 arranged along a second direction Y. Adjacent heat exchange elements 131 are thermally connected to battery cells 121. The heat exchange elements 131 are connected to the limiting beams 111 located on both sides of the battery cells 121 along the first direction X. The first direction X intersects the second direction Y, and the plane containing the first direction X and the second direction Y intersects the height direction Z of the housing 110.

[0120] The limiting beam 111 is a beam-shaped structural component on the housing 110 of the battery device 100, arranged along the expansion direction of the battery cell 121, and is mainly used to bear and resist the expansion force of the battery cell 121.

[0121] Multiple battery cells 121 can be arranged along a first direction X to form a battery cell assembly 120, and the number of battery cell assemblies 120 can be one or more. When there are multiple battery cell assemblies 120, they can be arranged sequentially along a second direction Y, that is, along the arrangement direction of multiple heat exchange elements 131.

[0122] The connection methods between the heat exchanger 131 and the limiting beam 111 include, but are not limited to, welding, riveting, or integral molding.

[0123] The housing 110 can be one of the structures listed above, and will not be described in detail here. The housing 110 can be formed from plastic by injection molding, or it can be made of metal, or it can be a composite of metal and plastic.

[0124] A thermally conductive connection refers to a form of connection between two components that enables efficient heat transfer. Its purpose is to quickly conduct the heat generated by the battery cell 121 to the heat exchanger 131, achieving thermal management. Unlike traditional mechanical connections, it does not require additional fixing structures to form an effective thermally conductive connection, although it can also be established through fixing. Specifically, it can take the form of direct bonding (without additional fixing components, heat transfer is achieved solely through surface contact), or a medium such as thermally conductive adhesive or a thermally conductive pad can be placed between the bonding surfaces of the two components to reduce contact thermal resistance. For example, thermally conductive adhesive or a thermally conductive pad can be placed between the heat exchanger 131 and the battery cell 121.

[0125] The battery device 100 of this application connects the heat exchange component 131 of the thermal management component 130 to the limiting beam 111 of the housing 110. By utilizing the structural rigidity of the heat exchange component 131 itself, the structural strength of the limiting beam 111 is enhanced, preventing the battery cell 121 from expanding excessively and shortening its service life. This improves the ability of the limiting beam 111 to resist the expansion force of the battery cell 121, which is beneficial to improving the overall strength and rigidity of the housing 110.

[0126] In some embodiments, please refer to Figure 2 The heat exchanger 131 includes a collector 1311 and a body. The two ends of the body along the first direction X are respectively connected to the collectors 1311. The body has a heat exchange channel inside. The collector 1311 at one end of the body along the first direction X is configured to supply heat exchange medium into the heat exchange channel. The collector 1311 at the other end of the body along the first direction X is configured to discharge the heat exchange medium in the heat exchange channel. The limiting beams 111 located on both sides of the heat exchanger 131 along the first direction X are respectively the first limiting beam and the second limiting beam. The first limiting beam is connected to the collector 1311 located at one end of the body along the first direction X, and the second limiting beam is connected to the collector 1311 located at the other end of the body along the first direction X.

[0127] The heat exchanger 1311 is a component in which multiple heat exchange elements 131 are connected in parallel or in series. The heat exchange medium can be introduced into the heat exchange medium at one end of the main body along the first direction X. The heat exchange medium flows into the heat exchange channel of the main body through the heat exchange medium 1311, and flows out through the heat exchange channel to the heat exchange medium 1311 at the other end of the main body along the first direction X, and flows out through the heat exchange medium 1311.

[0128] The first and second limiting beams can have the same or different structures. In one example, the first and second limiting beams are symmetrically arranged on both sides of the heat exchanger 131 along the first direction X.

[0129] The collectors 1311 are arranged at both ends of the main body along the first direction X, which facilitates the connection between multiple heat exchange components 131. At the same time, the collectors 1311 of each heat exchange component 131 are connected to the limiting beam 111, which helps to improve the strength of the limiting beam 111, thereby improving the overall strength and rigidity of the box 110.

[0130] In some embodiments, the current collector 1311 is disposed on the top of the body portion, and the two ends of the body portion are connected to the first limiting beam and the second limiting beam respectively, specifically by welding.

[0131] In some embodiments, the current collector 1311 includes a first portion 13111 and a second portion 13112. The first portion 13111 extends along the height direction Z of the housing 110, and the second portion 13112 extends along the second direction Y. The first portion 13111 and the second portion 13112 are connected. The body includes a first heat exchange plate 1312 and a second heat exchange plate 1313. Both the first heat exchange plate 1312 and the second heat exchange plate 1313 have heat exchange channels inside. The first portion 13111 is connected to the first heat exchange plate 1312, and the second portion 13112 is connected to the second heat exchange plate 1313. At least one of the first portion 13111 and the second portion 13112 is connected to the limiting beam 111.

[0132] The connection method between the first part 13111 and the second part 13112 can be bonding, welding, or integral molding, etc.

[0133] In one example, the second part 13112 is used to block the heat exchange channel in the body, and the first part 13111 is provided with a heat exchange medium port communicating with the heat exchange channel. The heat exchange medium port of the collector 1311 at one end of the body along the first direction X is the inlet, and the heat exchange medium port of the collector 1311 at the other end is the outlet.

[0134] The first heat exchange plate 1312 and the second heat exchange plate 1313 can be perpendicular to each other.

[0135] In one example, the portion of the current collector 1311 connected to the first heat exchange plate 1312 and the other portion of the current collector 1311 connected to the second heat exchange plate 1313 are both welded to the limiting beam 111.

[0136] The first heat exchange plate 1312 and the second heat exchange plate 1313 intersect and are connected to each other, which can increase the rigidity and strength of the main body, thereby improving the ability of the limiting beam 111 to resist the expansion force of the battery cell 121 and reduce the deformation of the housing 110. At the same time, the first heat exchange plate 1312 and the second heat exchange plate 1313 can also exchange heat with both sides (first side 1211 and second side 1212) of the battery cell 121 to improve the heat exchange effect between the thermal management component 130 and the battery cell 121.

[0137] In some embodiments, please refer to Figure 4 The connection between the current collector 1311 and the limiting beam 111 is by welding.

[0138] Compared with detachable connections, fixing the current collector 1311 to the limiting beam 111 by welding can prevent loosening and abnormal noise and wear between the limiting beam 111 and the current collector 1311 in vibration environments. This reduces the possibility of leakage caused by mutual wear between the current collector 1311 and the limiting beam 111 due to loosening, and helps to improve the reliability of operation.

[0139] In some embodiments, please refer to Figure 4 Along the second direction Y, chamfers are provided at the locations where the current collector 1311 intersects with the sidewalls of the limiting beam 111 on both sides, and welds 133 are used to fill the chamfers. The welds 133 largely fill the chamfers, so that the welds 133 do not protrude from the chamfer, thereby reducing the possibility of the welds 133 squeezing the battery cell 121 during expansion. The welds 133 may also protrude slightly from the chamfer.

[0140] The chamfering reduces the size of the weld 133 protruding from the chamfer, reduces excessive compression of the battery cell 121 by the weld 133 during the expansion process, thereby reducing the deformation of the battery cell 121 and reducing the risk of short circuit caused by damage to the battery cell 121 due to excessive compression of the battery cell 121 by the weld 133, which is beneficial to improving the safety of the battery cell 121.

[0141] In some embodiments, please refer to Figure 2 The limiting beam 111 has a groove 1111 on the wall facing the battery cell 121. Each current collector 1311 corresponds to a groove 1111. The groove 1111 is used to accommodate at least part of the current collector 1311.

[0142] The outline of the projection of the groove 1111 along the first direction X onto the surface of the battery cell 121 can be rectangular, V-shaped, trapezoidal, or semi-circular, etc.

[0143] Taking the outline of the projection of the groove 1111 along the first direction X onto the surface of the battery cell 121 as a rectangle as an example, the groove 1111 and the current collector 1311 can be in clearance fit, and then the current collector 1311 is fixed to the limiting beam 111 by welding.

[0144] In the same limiting beam 111, the spacing between any two adjacent grooves 1111 along the second direction Y can be set to be equal, and the groove depth of the grooves 1111 can also be set to be equal.

[0145] The groove 1111 provides positioning for the installation of the current collector 1311 and the limiting beam 111, preventing the current collector 1311 from being offset too much and causing the space between two adjacent heat exchange components 131 to be narrow, thereby facilitating the installation of the battery cell 121.

[0146] In some embodiments, please refer to Figure 2 and Figure 5 The current collector 1311 has a protrusion 13113 extending along a first direction X, and the groove 1111 accommodates at least a portion of the protrusion 13113.

[0147] Specifically, the protrusion 13113 can be a part of the first part 13111, and can also be connected to the first part 13111. The specific connection method can be welding, bonding, or integral molding, etc.

[0148] The aforementioned heat exchange medium port can be located at the protrusion 13113.

[0149] Therefore, the first part 13111 of the current collector 1311 can be easily inserted into the groove 1111, which facilitates the positioning of the current collector 1311 and reduces the first part 13111 from occupying too much of the housing space of the box 110, which is conducive to improving the space utilization of the housing 110 and thus improving the volumetric energy density of the battery device 100.

[0150] In some embodiments, please refer to Figure 2 and Figure 3 The limiting beam 111 has a chamber 1112, and the groove 1111 is connected to the chamber 1112. The collectors 1311 of two adjacent heat exchangers 131 are connected in series or in parallel through pipes 132, and part of the pipes 132 are located in the chamber 1112.

[0151] The chamber 1112 extends along the length of the limiting beam 111. The top of the limiting beam 111 has an opening that communicates with the chamber 1112, through which the pipe 132 can be inserted into the chamber 1112. The top of the limiting beam 111 may also be provided with a top wall, which covers the opening and is connected to the limiting beam 111. Specifically, the connection can be made by bonding, welding, riveting, or screwing.

[0152] In one example, along the second direction Y, each current collector 1311 of the two heat exchangers 131 furthest apart is provided with a through hole, which communicates with the heat exchange flow channel within the heat exchanger 131. Along the first direction X, the through holes of two adjacent current collectors 1311 on the same side of the battery cell assembly 120 are connected by a pipe 132. Along the second direction Y, the current collectors 1311 of the two furthest heat exchangers 131 are provided with a groove that communicates with the heat exchange flow channel, and the through hole of the current collector 1311 adjacent to the furthest heat exchanger 131 is connected to the groove through the pipe 132.

[0153] If the pipe 132 is directly placed within the housing 110 without changing the housing space, it will occupy additional housing space, resulting in a decrease in the space utilization rate of the housing 110 and thus affecting the volumetric energy density of the battery device 100. However, by setting a chamber 1112 in the limiting beam 111 and placing the pipe 132 connecting the adjacent current collector 1311 in the chamber 1112, the internal space of the limiting beam 111 can be fully utilized, reducing the space occupied by the pipe 132 in the housing 110. With the improved space utilization rate, a larger volume battery cell 121 can be arranged in the limited housing space, which is conducive to improving the volumetric energy density of the battery device 100. At the same time, placing the pipe 132 in the chamber 1112 can also reduce the compression of the pipe 132 when the battery cell 121 expands, ensuring the stability of the connection of the pipe 132.

[0154] In some embodiments, please refer to Figure 2 The groove 1111 penetrates the top of the wall of the limiting beam 111 to form a notch.

[0155] The installation is completed by inserting the current collector 1311 into the groove 1111 from the top, and simultaneously placing the pipe 132 into the chamber 1112. However, if the groove 1111 does not penetrate the top of the wall, the current collector 1311 must first be installed in the groove 1111, and then the pipe 132 must be connected in the chamber 1112. Since the chamber 1112 is small, installation is inconvenient. Therefore, having the groove 1111 penetrate the top of the wall facilitates the installation of the pipe 132 and the current collector 1311.

[0156] In some embodiments, the current collectors 1311 at both ends of the body portion along the first direction X are respectively the first current collector and the second current collector, and along the second direction Y, the size of the first portion 13111 of the first current collector and the size of the first portion 13111 of the second current collector are equal.

[0157] Since the first part 13111 of the first current collector and the second current collector are of equal size, the positions of the first current collector and the second current collector can be interchanged and inserted into the groove 1111 during installation to improve the ease of installation.

[0158] In some embodiments, the current collectors 1311 at both ends of the body portion along the first direction X are configured to be connected to any one of the limiting beams 111. Specifically, the current collectors 1311 can be inserted into the grooves 1111 of the limiting beams 111 on both sides of the battery cell assembly 120.

[0159] If the current collector 1311 can only be connected to a specific limiting beam 111, it will increase the positioning difficulty during assembly and easily lead to assembly errors. By configuring the current collector 1311 to be able to connect to any limiting beam 111, the versatility of the current collector 1311 is achieved. During assembly, there is no need to strictly distinguish the installation direction of the two ends of the current collector 1311, which reduces the assembly difficulty and reduces assembly errors.

[0160] In some embodiments, please refer to Figure 2 , Figure 5 , Figures 10-12 The main body includes a first heat exchange plate 1312, and the battery cell 121 is thermally connected to the first heat exchange plate 1312 on both sides along the second direction Y. The first heat exchange plate 1312 has a receiving cavity inside, and a first guide rib 13121 and a plurality of second guide ribs 13122 are respectively disposed in the receiving cavity. The receiving cavity extends through both ends of the first heat exchange plate 1312 along the first direction X, and the first heat exchange plate 1312 is connected to a current collector 1311 at both ends along the first direction X. The first guide rib 13121 is located on one side of the second guide rib 13122 along the first direction X, and the plurality of second guide ribs 13122 are spaced apart along the height direction Z of the housing 110 and extend along the first direction X. The heat exchange channel includes a first heat exchange channel 13123, a first guide rib 13121, multiple second guide ribs 13122, the wall of the receiving cavity, and a collector 1311, which together form a bent first heat exchange channel 13123.

[0161] As an example, along the height direction Z of the housing 110, one end of one of the second guide ribs 13122, which are furthest apart, is connected to the first guide rib 13121. Along the first direction X, the other end of the second guide rib 13122 is spaced apart from the collector 1311 on the side of the second guide rib 13122 facing away from the first guide rib 13121. The ends of the remaining second guide ribs 13122 above the second guide rib 13122 facing the first guide rib 13121 are all spaced apart from the first guide rib 13121, and the end of one of the remaining second guide ribs 13122 above the second guide rib 13122 facing away from the first guide rib 13121 is connected to the collector 1311. Along the first direction X, the two ends of the remaining second guide ribs 13122 below the second guide rib 13122 are all spaced apart from the collectors 1311 at both ends of the main body.

[0162] As another example, multiple second guide ribs 13122 are offset along the first direction X to form a bent first heat exchange channel 13123.

[0163] As an example, multiple sets of second guide ribs 13122 are provided, with the same end of the second guide ribs 13122 in the same set being flush, and the second guide ribs 13122 in different sets being staggered along the first direction X.

[0164] The battery cell 121 generates a large amount of heat during cyclic charging and discharging. If the heat exchange channel is a direct current channel, the heat exchange medium flows through quickly, the heat exchange time is short, and the heat exchange efficiency is low, which can easily lead to excessively high temperatures in the battery cell 121 and affect battery performance. The first heat exchange plate 1312 is provided with a bent first heat exchange channel 13123, which can extend the flow path and residence time of the heat exchange medium in the heat exchange plate, increase the contact area between the heat exchange medium and the first heat exchange plate 1312, and improve the heat exchange efficiency. At the same time, the first guide rib 13121 and the second guide rib 13122 can improve the structural rigidity of the first heat exchange plate 1312, so that the first heat exchange plate 1312 can not only efficiently dissipate heat from the battery cell 121, but also provide more stable rigid support for the limiting beam 111 through the current collectors 1311 at both ends, and also prevent the first heat exchange channel 13123 from deforming under the compression of the battery cell 121. In other examples, only the second guide rib 13122 can be set, without setting the first guide rib 13121.

[0165] In some embodiments, please refer to Figures 5-10 The main body also includes a second heat exchange plate 1313, and the first heat exchange plate 1312 and the second heat exchange plate 1313 intersect and are connected to each other. Along the height direction Z of the housing 110, the second heat exchange plate 1313 is disposed on one side of the battery cell 121 and is thermally connected to the battery cell 121. The heat exchange channel includes a second heat exchange channel 13132. The second heat exchange plate 1313 has a second heat exchange channel 13132 inside. The first heat exchange channel 13123 is connected to the second heat exchange channel 13132.

[0166] The second heat exchange plate 1313 and the first heat exchange plate 1312 can be fixed by welding or bonding, or they can be integrally formed.

[0167] The second heat exchange plates 1313 of two adjacent heat exchange elements 131 can be spaced apart or abutted together.

[0168] The second heat exchanger connected to the first heat exchanger can form a T-shaped beam, meaning the outer contour of the beam's cross-section is generally T-shaped, or it can be an L-shaped beam, meaning the outer contour of the beam's cross-section is generally L-shaped. The two heat exchangers 131 furthest apart along the second direction Y can use L-shaped beams as their heat exchange structure, while the remaining heat exchangers 131 between the two furthest apart along the second direction Y can use T-shaped beams as their heat exchange structure.

[0169] As an example, the second heat exchange plate 1313 has a cavity inside and at least one support rib 13131 disposed in the cavity, the support rib 13131 extending along a first direction X. The two ends of the support rib 13131 are spaced apart from the current collector 1311 along the first direction X, and the support rib 13131 and the interior of the cavity together define the second heat exchange channel 13132.

[0170] The second heat exchange channel 13132 and the first heat exchange channel 13123 can be connected in parallel or in series.

[0171] As an example, the first heat exchange channel 13123 includes a first channel 131231, a second channel 131232, and a third channel 131233. The first channel 131231, the second channel 131232, and the third channel 131233 are connected in series and arranged sequentially from top to bottom along the height direction Z of the housing 110. The third channel 131233 is connected in parallel with the second heat exchange channel 13132 and is connected in series with the second channel 131232. Both are connected to the collector 1311 at one end of the main body, and the first channel 131231 is connected to the collector 1311 at the other end of the main body.

[0172] A second heat exchange plate 1313 is added and intersects with the first heat exchange plate 1312. The second heat exchange plate 1313 is thermally connected to the battery cell 121 along the height direction Z of the housing 110, enabling heat dissipation from the sides and bottom, or sides and top, of the battery cell 121. The first heat exchange channel 13123 and the second heat exchange channel 13132 are connected, allowing the heat exchange medium to flow through both heat exchange plates simultaneously, ensuring uniform heat dissipation and reducing local overheating of the battery cell 121. Furthermore, the connection between the second heat exchange plate 1313 and the first heat exchange plate 1312 further enhances the overall structural rigidity of the heat exchange component 131. In other examples, the second heat exchange plate 1313 may be omitted, and only the first heat exchange plate 1312 may be provided; the housing 110 may include a bottom wall for supporting the battery cell 121.

[0173] In some embodiments, please refer to Figure 2 The two heat exchangers 131 that are furthest apart along the second direction Y are the first heat exchangers, and the heat exchanger 131 between the two first heat exchangers is the second heat exchanger. In the same first heat exchanger, the side of the first heat exchange plate 1312 facing away from the battery cell 121 is flush with the end of the second heat exchange plate 1313 facing away from the battery cell 121.

[0174] Therefore, the two heat exchangers 131 furthest apart along the second direction Y can be configured in this structure. On the one hand, the area of ​​the second heat exchange plate 1313 in thermal connection with the battery cell 121 can be increased to improve the heat exchange effect; on the other hand, compared with the first heat exchange plate 1312 being located between the two ends of the second heat exchange plate 1313 along the second direction Y, the space utilization of the housing 110 can be improved. That is, within the limited accommodating space, the distance between the first heat exchange plate 1312 of the two heat exchangers 131 furthest apart along the second direction Y is increased, so that a larger volume battery cell 121 can be accommodated, which is beneficial to improving the volumetric energy density of the battery device 100.

[0175] In some embodiments, please refer to Figure 2 The two heat exchangers 131 that are furthest apart along the second direction Y are the first heat exchangers, and the heat exchanger 131 between the two first heat exchangers is the second heat exchanger. In the same second heat exchanger, along the second direction, both sides of the first heat exchange plate 1312 are spaced apart from the two ends of the second heat exchange plate 1313 along the second direction Y.

[0176] Therefore, the same battery cell 121 can be thermally connected to the second heat exchange plate 1313 of the two heat exchange elements 131 to increase the heat exchange area and improve the heat exchange effect.

[0177] In some embodiments, please refer to Figure 2 The housing 110 includes a mounting beam 112 for mounting the battery device 100. The battery cell assembly 120 is provided with mounting beams 112 on both sides along the second direction Y. The first heat exchanger is connected to the mounting beam 112.

[0178] Taking the application of the battery device 100 in a vehicle as an example, the mounting beam 112 is a connecting beam for mounting the battery device 100 to the vehicle, and the mounting beam 112 is provided with mounting holes (not shown in the figure) for connecting to the vehicle. Taking the vehicle's direction of travel as a reference, the second direction Y is typically perpendicular to both the vehicle's direction of travel and the height direction Z.

[0179] This improves the strength and rigidity of the housing 110, which is beneficial for enhancing the protection performance of the housing 110 for the battery cells 121.

[0180] In some embodiments, please refer to Figure 2 The second heat exchange plate 1313 of each heat exchange component 131 forms the bottom wall of the housing 110.

[0181] The second heat exchange plate 1313 forms the bottom wall of the housing 110. Compared with the prior art where the water-cooling plate is installed on the bottom wall of the housing 110, the thickness of the bottom wall of the housing 110 can be reduced. While keeping the height of the housing 110 unchanged, the housing 110's accommodating space can be increased to accommodate larger battery cells 121, thereby improving the volumetric energy density of the battery device 100. In another example, the second heat exchange plate 1313 can also be disposed on top of the battery cell 121. The second heat exchange plate 1313 is connected to two adjacent sets of battery cells 121 along the second direction Y, specifically by bonding. This arrangement helps improve the overall rigidity of the battery device 100 and reduces the possibility of electrical connection failure between adjacent battery cells 121 during the expansion of the battery cells 121 (adjacent battery cells 121 are usually electrically connected through a busbar).

[0182] In some embodiments, please refer to Figure 2 The battery cell 121 has a first side 1211 and a second side 1212. The area of ​​the first side 1211 is larger than the area of ​​the second side 1212. The first side 1211 is positioned facing the limiting beam 111.

[0183] The expansion amount of the first side 1211 is relatively large. The first side 1211 faces the limiting beam 111, which allows the limiting beam 111 to absorb the large expansion amount, thereby reducing the deformation of the box 110 and improving the reliability of the battery device 100.

[0184] In one specific alternative embodiment of the battery device 100, please refer to Figures 2-12The battery device 100 includes a housing 110, a battery cell assembly 120, and a thermal management component 130. The housing 110 has an accommodating space and includes limiting beams 111. The battery cell assembly 120 is disposed within the accommodating space, and the limiting beams 111 are respectively provided on both sides of the battery cell assembly 120 along a first direction X. The battery cell assembly 120 includes multiple battery cells 121. The thermal management component 130 is disposed within the accommodating space and includes multiple heat exchange elements 131 arranged along a second direction Y. Adjacent heat exchange elements 131 are thermally connected to each other by a battery cell 121. The heat exchanger 131 includes a first heat exchange plate 1312, a second heat exchange plate 1313, and a current collector 1311. The battery cell 121 is thermally connected to the first heat exchange plate 1312 on both sides along the second direction Y. The first heat exchange plate 1312 has a receiving cavity and a first guide rib 13121 and a plurality of second guide ribs 13122 respectively disposed in the receiving cavity. The receiving cavity extends through both ends of the first heat exchange plate 1312 along the first direction X. The current collector 1311 is connected to both ends of the first heat exchange plate 1312 along the first direction X. The first guide rib 13121 is located on one side of the second guide rib 13122 along the first direction X. The plurality of second guide ribs 13122 are spaced apart along the height direction Z of the housing 110 and extend along the first direction X. The first guide rib 13121, the plurality of second guide ribs 13122, the wall of the receiving cavity, and the current collector 1311 together form a bent first heat exchange channel 13123. The first heat exchange plate 1312 and the second heat exchange plate 1313 intersect and are connected to each other. Along the height direction Z of the housing 110, the second heat exchange plate 1313 is located on one side of the battery cell 121 and is thermally connected to the battery cell 121. The interior of the second heat exchange plate 1313 has a second heat exchange channel 13132, and the first heat exchange channel 13123 is connected to the second heat exchange channel 13132. The second heat exchange plate 1313 forms the bottom wall of the housing 110. The two ends of the first heat exchange plate 1312 are respectively connected to current collectors 1311, which respectively block the two ends of the first heat exchange plate 1312 and the two ends of the second heat exchange plate 1313. The current collectors 1311 are connected to the first heat exchange channel 13123 inside the first heat exchange plate 1312. The limiting beams 111 on both sides of the heat exchanger 131 along the first direction X are the first limiting beam and the second limiting beam, respectively. The current collectors 1311 at both ends of the first heat exchange plate 1312 are welded to the first limiting beam and the second limiting beam, respectively. The current collectors 1311 are provided with chamfers at the positions where they intersect with the side walls of the limiting beams 111 along the second direction Y, and the chamfers are filled with welds 133. The wall of the limiting beams 111 facing the battery cell 121 is provided with a groove 1111 that penetrates the top of the wall of the limiting beams 111. Each current collector 1311 corresponds to one groove 1111, and the groove 1111 is used to accommodate at least part of the current collector 1311.The collector 1311 includes a first part 13111 and a second part 13112. The first part 13111 is connected to the first heat exchange plate 1312, and the second part 13112 is connected to the second heat exchange plate 1313. Both the first part 13111 and the second part 13112 are welded to the limiting beam 111. The limiting beam 111 has a chamber 1112, and the groove 1111 is connected to the chamber 1112. The collectors 1311 of two adjacent heat exchange elements 131 are connected in series or in parallel through pipes 132, and part of the pipes 132 are located in the chamber 1112. The first direction X intersects the second direction Y, and the plane containing the first direction X and the second direction Y intersects the height direction Z of the housing 110.

[0185] In this application, the battery device 100 welds the current collector 1311 of the heat exchanger 131 to the limiting beam 111 of the housing 110. Utilizing the structural rigidity of the heat exchanger 131 itself, the structural strength of the limiting beam 111 is enhanced, preventing excessive expansion of the battery cell 121 and thus shortening its lifespan. This improves the limiting beam 111's ability to resist the expansion force of the battery cell 121, thereby enhancing the overall strength and rigidity of the housing 110. Simultaneously, by placing the pipeline 132 within the chamber 1112 of the limiting beam 111 and using the second heat exchange plate 1313 as the bottom wall of the housing 110, the thickness of the bottom wall of the housing 110 can be reduced, improving the space utilization of the housing 110. Furthermore, the current collector 1311 is chamfered at the points where it intersects with the side walls of the limiting beam 111 along the second direction Y, and these chamfered points are welded. This reduces damage to the battery cell 121 during its expansion, improving the safety of the battery device 100.

[0186] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: A box-shaped enclosure having a receiving space, the box-shaped enclosure including a limiting beam; A battery cell assembly is disposed within the accommodating space. The battery cell assembly is provided with limiting beams on both sides along the first direction. The battery cell assembly includes multiple battery cells. A thermal management component is disposed within the accommodating space. The thermal management component includes multiple heat exchange elements arranged along a second direction. A battery cell is disposed between two adjacent heat exchange elements. The first direction intersects the second direction. The plane containing the first direction and the second direction intersects the height direction of the housing. The heat exchanger includes a collector and a body. The collectors are connected to both ends of the body along the first direction. The body has a heat exchange channel inside. The collector at one end of the body along the first direction is configured to supply heat exchange medium into the heat exchange channel. The collector at the other end of the body along the first direction is configured to discharge the heat exchange medium from the heat exchange channel. Along the first direction, the limiting beams on both sides of the heat exchanger are a first limiting beam and a second limiting beam. The first limiting beam is connected to the collector at one end of the body, and the second limiting beam is connected to the collector at the other end of the body. The current collector includes a first part and a second part, the first part extends along the height direction of the housing, the second part extends along the second direction, and the first part and the second part are connected. The main body includes a first heat exchange plate and a second heat exchange plate. Both the first heat exchange plate and the second heat exchange plate have heat exchange channels inside. The first part is connected to the first heat exchange plate, and the second part is connected to the second heat exchange plate. At least one of the first part and the second part is connected to the limiting beam.

2. The battery device according to claim 1, characterized in that, The current collector is welded to the limiting beam.

3. The battery device according to claim 2, characterized in that, Along the second direction, chamfers are provided at the positions where the two sides of the current collector intersect with the side wall of the limiting beam, and the chamfers are filled with welds.

4. The battery device according to claim 1, characterized in that, The limiting beam has a groove on the wall facing the battery cell, and each current collector corresponds to one groove, the groove accommodating at least a portion of the current collector.

5. The battery device according to claim 4, characterized in that, The current collector has a protrusion extending along the first direction, and the groove accommodates at least a portion of the protrusion.

6. The battery device according to claim 5, characterized in that, The limiting beam has a cavity, the groove is connected to the cavity, and the collectors of two adjacent heat exchangers are connected in series or parallel through pipelines, with some of the pipelines located in the cavity. And / or, the groove extends through the top of the wall; And / or, the current collectors at both ends of the body portion along the first direction are respectively a first current collector and a second current collector, and along the second direction, the size of the protrusion of the first current collector and the size of the protrusion of the second current collector are equal; And / or, the current collectors at both ends of the body portion along the first direction are configured to be connected to any one of the limiting beams.

7. The battery device according to claim 1, characterized in that, The battery cell is thermally connected to the first heat exchange plate on both sides along the second direction. The first heat exchange plate has a receiving cavity and a first guide rib and a plurality of second guide ribs respectively disposed in the receiving cavity. The receiving cavity extends through both ends of the first heat exchange plate along the first direction. The current collector is connected to both ends of the first heat exchange plate along the first direction. The first guide rib is located on one side of the second guide rib along the first direction. The plurality of second guide ribs are spaced apart along the height direction of the housing and extend along the first direction. The heat exchange channel includes a first heat exchange channel. The first guide rib, the plurality of second guide ribs, the wall of the receiving cavity and the current collector together form a bent first heat exchange channel.

8. The battery device according to claim 7, characterized in that, The first heat exchange plate and the second heat exchange plate intersect and are connected to each other. Along the height direction of the housing, the second heat exchange plate is disposed on one side of the battery cell and is thermally connected to the battery cell. The heat exchange channel includes a second heat exchange channel. The second heat exchange plate has a second heat exchange channel inside. The first heat exchange channel is connected to the second heat exchange channel.

9. The battery device according to claim 8, characterized in that, The two heat exchange elements that are furthest apart along the second direction are the first heat exchange elements, and the heat exchange element between the two first heat exchange elements is the second heat exchange element; In the same first heat exchanger, the side of the first heat exchange plate facing away from the battery cell is flush with the end of the second heat exchange plate facing away from the battery cell, and / or, in the same second heat exchanger, along the second direction, both sides of the first heat exchange plate are spaced apart from the two ends of the second heat exchange plate along the second direction.

10. The battery device according to claim 9, characterized in that, The housing includes mounting beams for mounting the battery device, the battery cell assembly has mounting beams on both sides along the second direction, the first heat exchanger is connected to the mounting beams; and / or, the second heat exchange plates of each of the heat exchangers form the bottom wall of the housing.

11. The battery device according to any one of claims 1-10, characterized in that, The battery cell has a first side and a second side, the area of ​​the first side is larger than the area of ​​the second side, and the first side faces the limiting beam.

12. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1-11, the battery device being used to provide electrical energy to electrical equipment.

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