A battery device, a heat exchange assembly, and an electrical appliance.

Abstract

This application relates to the field of battery technology, providing a battery device, a heat exchange assembly, and an electrical device. The battery device includes a heat exchange assembly and at least two battery cells. The heat exchange assembly includes a heat exchange body and a current collector. The heat exchange body has at least one medium flow channel, which extends through at least one end of the heat exchange body along a first direction to form a port. The at least one medium flow channel is used to circulate a heat exchange medium for heat exchange with at least two battery cells. The current collector has a liquid inlet and a confluence flow channel communicating with the liquid inlet. At least one medium flow channel is connected to the confluence flow channel. The outer surface of the port and one of the current collectors have a connecting portion, and the other has a toothed portion. The connecting portion forms a groove, and the toothed portion is disposed within the groove. The depth of the groove is 0.1 to 0.5 times the wall thickness of the connecting portion. This improves the connection reliability and sealing performance between the current collector and the heat exchange body, thereby improving the reliability of the heat exchange assembly.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device, a heat exchange component, and an electrical appliance. Background Technology

[0002] Battery devices can be used to store or provide electrical energy, and they can be used in electrical equipment, such as vehicles. Taking vehicles as an example, in a vehicle equipped with a battery device, the battery device can provide all or part of the power.

[0003] In related technologies, during the use of battery devices, the temperature of the individual battery cells rises, requiring temperature control to prevent adverse effects on the performance and lifespan of the battery device. Therefore, improving the reliability of heat exchange components while regulating the temperature of individual battery cells has become an important research direction in this field. Utility Model Content

[0004] In view of this, embodiments of this application provide a battery device, a heat exchange component, and an electrical device, which can improve the reliability of the heat exchange component.

[0005] To achieve the above objectives, the technical solution of this application embodiment is implemented as follows:

[0006] This application provides a battery device, including:

[0007] At least two battery cells;

[0008] Heat exchange components, including:

[0009] A heat exchange body is formed with at least one medium flow channel, the medium flow channel passing through at least one end of the heat exchange body along a first direction to form a port portion, at least one of the medium flow channels is used for circulating heat exchange medium, the heat exchange medium is used for exchanging heat with the at least two battery cells;

[0010] A manifold has an inlet and a flow channel communicating with the inlet, and at least one of the medium channels is communicating with the flow channel.

[0011] The outer surface of the port portion and one of the current collectors have a connecting portion, and the other has a toothed portion. The connecting portion forms a groove, and the toothed portion is disposed in the groove. The depth of the groove is 0.1 to 0.5 times the wall thickness of the connecting portion.

[0012] The battery device provided in this application embodiment includes a heat exchange component for exchanging heat with individual battery cells. The inlet port can be used to inject or discharge heat exchange medium into the manifold. Heat exchange medium can be transported between the medium channel and the manifold. Teeth are embedded in grooves, and the teeth and grooves mesh. The depth of the groove is 0.1 to 0.5 times the wall thickness of the connection portion, balancing the connection strength between the heat exchange body and the manifold as well as the structural strength of the connection portion. This improves the connection reliability and sealing performance between the manifold and the heat exchange body, thereby enhancing the reliability of the heat exchange component.

[0013] In some embodiments, at least one of the grooves is a closed ring surrounding the connection.

[0014] In this embodiment, the closed-loop groove can form a complete sealing groove around the connection part, which is beneficial to further improve the sealing performance between the manifold and the heat exchange body and reduce the risk of heat exchange medium leakage.

[0015] In some embodiments, the depth of the groove is 30μm-180μm.

[0016] In this embodiment, the depth of the groove is 30μm-180μm, taking into account both the connection strength between the heat exchange body and the collector and the structural strength of the connection.

[0017] In some embodiments, the heat exchanger body is a metal structure and the manifold is a plastic structure.

[0018] In this embodiment, the heat exchanger body is a metal structure. Metal structures have a higher thermal conductivity than plastic structures, exhibiting excellent heat transfer and temperature resistance, thus meeting the requirements for higher-rate fast charging and thermal runaway. The current collector is a plastic structure. Plastic structures are lightweight and possess good corrosion resistance, fatigue resistance, and insulation and voltage withstand properties, which helps reduce the weight of the heat exchange components and achieve lightweighting of the battery device.

[0019] In some embodiments, at least a portion of the manifold is injection molded to the port portion.

[0020] In this embodiment, at least a portion of the manifold is injection molded to the port portion, which reduces the assembly steps between the manifold and the heat exchanger body and improves the connection reliability between the manifold and the heat exchanger body.

[0021] In some embodiments, the manifold includes an adapter ring and a manifold body, the manifold body forming the infusion port and the flow channel, the adapter ring being injection molded to the port portion, the adapter ring having the connecting portion or the toothed portion, and the manifold body being connected to the adapter ring.

[0022] In this embodiment, the adapter ring and the collector body are manufactured separately. The adapter ring is injection molded to the port portion, and the collector body is connected to the adapter ring. This simplifies the injection mold and facilitates demolding of the heat exchange body and the adapter ring after injection molding, thus reducing manufacturing difficulty.

[0023] In some embodiments, the adapter ring includes a first annular portion and a second annular portion. The first annular portion is disposed around the outer periphery of the port portion and has the connecting portion or the toothed portion. The second annular portion is connected to one end of the first annular portion that is close to the current collecting body along a first direction, and the second annular portion is connected to the current collecting body.

[0024] In this embodiment, the first annular portion and the second annular portion are roughly circular. The first annular portion is connected to the port portion, and the second annular portion is connected to the current collection body. Thus, the adapter ring structure is simple, easy to injection mold, and easy to demold.

[0025] In some embodiments, the first annular portion has the teeth, the port portion has the connecting portion, and the width of the first annular portion along the first direction is not less than the total width of all the grooves along the first direction.

[0026] In this embodiment, the width of the first annular portion along the first direction is not less than the total width of all grooves along the first direction, which can reduce the risk of local stress concentration caused by pressure on the heat exchange body during assembly, thereby improving the sealing performance of the heat exchange component during assembly into the thermal management system and during operation.

[0027] In some embodiments, the width of the groove along the first direction is 0.05 to 0.5 times the wall thickness of the connection.

[0028] In this embodiment, the width of the groove along the first direction is 0.05 to 0.5 times the wall thickness of the connecting part. The moderate width of the groove along the first direction is conducive to the teeth being set in the groove. In the embodiment where the adapter ring is injection molded into the port part, the flow resistance of the adapter ring during injection molding can be reduced, allowing the molten plastic particles to smoothly enter the groove and combine with the port part. At the same time, the risk of deforming the port part and causing the plastic particles to be unable to enter the groove is reduced.

[0029] In some embodiments, the connecting portion forms at least two grooves spaced apart along the first direction.

[0030] In this embodiment, the engagement of multiple grooves with multiple teeth not only enhances the connection strength but also improves the sealing performance.

[0031] In some embodiments, the width of the spacer wall between two adjacent grooves is 0.05 to 0.5 times the wall thickness of the connection.

[0032] In this embodiment, the width of the partition wall between two adjacent grooves is 0.05 to 0.5 times the wall thickness of the connecting part. The width of the partition wall is moderate, and the partition wall has good structural strength, which reduces the risk of groove deformation caused by partition wall deformation. This is beneficial for the teeth to fit into the groove. In the embodiment where the adapter ring is injection molded into the port, the risk of deforming the port and causing plastic particles to be unable to enter the groove can be reduced.

[0033] In some embodiments, the number of grooves is greater than 5 and less than 100.

[0034] In this embodiment, the number of grooves is greater than 5 and less than 100. The number of grooves is moderate, which can meet the structural strength requirements of the connection part, and also take into account the connection strength requirements of the port part and the current collector.

[0035] In some embodiments, the total width of all said grooves along the first direction is not less than 0.5 mm and not more than 15 mm.

[0036] In this embodiment, the total width of all grooves along the first direction is not less than 0.5mm and not more than 15mm, which can satisfy the sealing requirements at the connection between the current collector and the port, and also take into account the assembly requirements of the current collector and the port.

[0037] In some embodiments, the groove includes at least two sub-grooves, all of which intersect at one end.

[0038] In this embodiment, one end of all the sub-grooves intersects, and the groove forms multiple forked sub-grooves, which enhances the interlocking connection strength between the teeth and the groove and reduces the risk of the manifold detaching from the heat exchanger body during the process of the heat exchange medium being injected into the heat exchanger body.

[0039] In some embodiments, the heat exchange assembly includes a plug for sealing at least one of the port portions.

[0040] In this embodiment, a portion of the medium flow channel of the heat exchanger body is used for the flow of heat exchange medium, and the port of a portion of the medium flow channel is blocked by a block to restrict the flow path and flow direction of the heat exchange medium, thereby improving the heat exchange efficiency.

[0041] In some embodiments, the heat exchange assembly includes a plugging member disposed at one end of the plug block away from the medium flow channel, and the plugging member is injection molded into the port portion.

[0042] In this embodiment, the sealing element is located on the side of the plug block away from the medium flow channel. The plug block and the sealing element together seal the port, achieving localized double sealing of the medium flow channel. The sealing element can further improve the sealing performance. The sealing element is injection molded at the port and is made of plastic. This reduces the assembly process between the sealing element and the heat exchanger body and also improves the reliability of the connection between the sealing element and the heat exchanger body.

[0043] In some embodiments, the end face of the heat exchange body facing the sealing member forms a limiting groove, the sealing member forms a limiting flange, and the limiting flange is disposed in the limiting groove.

[0044] In this embodiment, the limiting flange is embedded in the limiting groove, and the connection strength between the heat exchange body and the sealing component is improved by the engagement of the limiting flange and the limiting groove.

[0045] In some embodiments, the heat exchange assembly includes a plugging member disposed at one end of the plug block away from the medium flow channel. The plugging member includes a plugging plate and a boss. The boss is connected to the end of the plugging plate near the plug head and is disposed within the port portion where the plug block is located.

[0046] In this embodiment, both the plug and the boss are disposed inside the port portion. The boss is located on the side of the plug away from the medium flow channel. The plug can restrict the movement of the boss towards the middle area of ​​the medium flow channel. The plug provides a limiting function for the boss. The plug and the boss together seal the port portion, achieving local double sealing of the medium flow channel. The boss can further improve the sealing performance and reduce the risk of overflow.

[0047] This application provides a heat exchange component, including:

[0048] A heat exchange body is formed with at least one medium flow channel, the medium flow channel extending through at least one end of the heat exchange body in a first direction to form a port portion, at least one of the medium flow channels is used for circulating heat exchange medium, the heat exchange medium is used for exchanging heat with at least two battery cells;

[0049] A manifold has an inlet and a flow channel communicating with the inlet, and at least one of the medium channels is communicating with the flow channel.

[0050] The outer surface of the port portion and one of the current collectors have a connecting portion, and the other has a toothed portion. The connecting portion forms a groove, and the toothed portion is disposed in the groove. The depth of the groove is 0.1 to 0.5 times the wall thickness of the connecting portion.

[0051] This application provides an electrical device, including any of the battery devices or heat exchange components described above. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the vehicle structure in some embodiments of this application;

[0053] Figure 2 This is an exploded schematic diagram of the battery device in some embodiments of this application;

[0054] Figure 3 This is a schematic diagram of the structure of the heat exchange components in some embodiments of this application;

[0055] Figure 4 for Figure 3 Cross-sectional schematic diagram of the heat exchange component;

[0056] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0057] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0058] Figure 7 This is a schematic diagram of the connecting portion and groove in other embodiments of this application;

[0059] Figure 8 This is an exploded view of the heat exchange components in some other embodiments of this application;

[0060] Figure 9 for Figure 8 A partial cross-sectional view of the heat exchanger assembly in its assembled state;

[0061] Figure 10 for Figure 8 A partially enlarged schematic diagram of the heat exchanger body;

[0062] Figure 11 This is a schematic diagram of the structure of the sealing element in some embodiments of this application;

[0063] Figure 12 This is a schematic diagram of the sealing element in some other embodiments of this application.

[0064] Explanation of reference numerals in the attached figures

[0065] 1000, Vehicle; 100, Battery Unit; 200, Controller; 300, Motor; 1, Battery Cell; 2, Heat Exchange Assembly; 21, Heat Exchange Body; 21a, Medium Flow Channel; 210a, Port Section; 21b, Limiting Groove; 22, Manifold; 22a, Infusion Port; 22b, Manifold; 221, Adapter Ring; 2211, First Annular Section; 2212, Second Annular Section; 222, Manifold Body; 201, Connecting Section; 201a, Groove; 202, Toothed Section; 23, Block; 24, Sealing Component; 241, Sealing Plate; 242, Boss; 3, Housing; 31, Cover; 32, Housing Body. Detailed Implementation

[0066] 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.

[0067] 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 belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application.

[0068] 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.

[0069] It should be noted that in this application, "at least two" refers to a quantity of two or more. "Multiple" refers to a quantity of two or more.

[0070] Please see Figure 1 and Figure 2 To facilitate understanding of the battery device 100 and electrical equipment provided in the embodiments of this application, some basic structures of the battery cell 1, battery device 100 and electrical equipment provided in the embodiments of this application will be introduced first.

[0071] In this embodiment of the application, the battery cell 1 can be a secondary battery, which refers to a battery cell that can be used again after being discharged by recharging to activate the active materials.

[0072] The battery cell 1 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.

[0073] A single battery cell 1 typically includes an electrode assembly, which comprises 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 the single battery cell 1, 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, serves to prevent short circuits between the electrodes while allowing active ions to pass through.

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

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

[0076] As an example, the positive 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.).

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

[0078] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0079] 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.).

[0080] 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.

[0081] 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.

[0082] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cell 1. 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 cell 1 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0083] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] In some embodiments, the battery cell 1 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-like, or solid.

[0088] Liquid electrolytes include electrolyte salts and solvents.

[0089] 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.

[0090] 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. Ether solvents 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.

[0091] 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 performance of the battery cell 1, such as additives that improve the overcharge / fast charge performance of the battery cell 1, additives that improve the high-temperature performance of the battery cell 1, additives that improve the low-temperature performance of the battery cell 1, etc.

[0092] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0093] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0094] 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.

[0095] 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 phosphorus sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0096] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0097] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0098] In some implementations, the electrode assembly is a stacked structure.

[0099] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0100] 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.

[0101] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0102] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0103] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0104] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0105] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0106] In some embodiments, the battery cell 1 may include a casing. The casing may 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 casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly for encapsulating the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating structure or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0107] As an example, the battery cell 1 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 battery cells. Multi-prismatic battery cells are, for example, hexagonal prismatic battery cells. This application does not have any particular limitations.

[0108] 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. The end cap may also have one or more.

[0109] 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.

[0110] In some embodiments, a pressure relief mechanism is provided on the outer casing. The pressure relief mechanism is used to release the internal gas of the battery cell 1.

[0111] As an example, when the internal pressure or temperature of battery cell 1 reaches a predetermined threshold, it is actuated to release the internal pressure or temperature. When the internal pressure or temperature of battery cell 1 reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is destroyed, thereby forming 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 battery cell 1.

[0112] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0113] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0114] The term "actuation" as used in this application refers to the pressure relief mechanism being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 1. The actions of the pressure relief mechanism may include, but are not limited to: movement of components within the pressure relief mechanism to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism, etc. When the pressure relief mechanism is actuated, the high-temperature, high-pressure substances inside the battery cell 1 are discharged outwards from the actuated portion as waste. This method enables the battery cell 1 to release pressure and temperature under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0115] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be configured as a through hole for discharging gas inside the battery cell 1.

[0116] The emissions from battery cell 1 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.

[0117] The battery device 100 provided in this application includes the battery cell 1 in any one embodiment of this application.

[0118] The battery device 100 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 1.

[0119] Multiple battery cells 1 can be connected in series, parallel, or mixed via a busbar. The busbar is used to achieve electrical connection between at least two battery cells 1.

[0120] For example, "hybrid connection" refers to at least two battery cells 1 that are connected in both series and parallel. At least two battery cells 1 can be directly connected in series, parallel, or hybrid connections; of course, at least two battery cells 1 can also be first connected in series, parallel, or hybrid connections to form a module, and then the module can be connected in series, parallel, or hybrid connections to form a whole.

[0121] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 1.

[0122] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 1 together to form an independent module. As an example, a battery module can be formed by bundling multiple battery cells 1 together with cable ties.

[0123] In some embodiments, the battery device 100 may be a battery pack.

[0124] Please see Figure 2 The battery device 100 may include a housing 3. As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be housed in the housing 3 by fixing the battery module in the housing 3.

[0125] As an example, the battery cell assembly can also be housed in the housing 3 by directly fixing multiple battery cells 1 to the housing 3.

[0126] In some embodiments, the housing 3 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 3 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 3 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0127] This application provides an electrical device, which includes a battery device 100 as described in any embodiment of this application. The battery device 100 is used to store or provide electrical energy.

[0128] Electrical equipment includes, but is not limited to, energy storage devices, mobile phones, tablets, laptops, electric toys, power tools, vehicles, ships, or spacecraft. Vehicles can include electric bicycles and electric cars; electric toys can include electric bicycle toys and electric car toys, etc., including stationary or mobile electric toys such as game consoles, electric car toys, electric boat toys, and electric airplane toys; spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0129] Energy storage devices include, but are not limited to, energy storage containers or energy storage cabinets.

[0130] In the following embodiments, for ease of explanation, a vehicle 1000 is used as an example of an electrical device according to an embodiment of this application. The description is as follows, with reference to the accompanying drawings.

[0131] Figure 1 The diagram illustrates the structure of a vehicle 1000 as provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Figure 1As shown, a battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0132] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0133] In related technologies, during the use of a battery device, the temperature of the individual battery cells rises, requiring temperature control. Heat exchange components are used to exchange heat with the battery cells to regulate their temperature. For example, when a battery cell is heating up during operation, the heat exchange component absorbs the heat to cool it down. When the ambient temperature is low and heating is needed to raise the temperature of the battery cell, the heat exchange component releases heat to the battery cell. In some cases, the heat exchange component includes a heat exchanger body and a current collector. The dimensions and surface flatness of the heat exchanger body are difficult to control, potentially leading to poor fit between the heat exchanger body and the current collector, affecting welding quality, and thus reducing the connection strength between the heat exchanger body and the current collector, thereby reducing the reliability of the heat exchange component.

[0134] In view of this, embodiments of this application provide a battery device, which includes a heat exchange assembly and at least two battery cells. The heat exchange assembly includes a heat exchange body and a current collector. The heat exchange body has at least one medium flow channel, which extends through at least one end of the heat exchange body in a first direction to form a port. The at least one medium flow channel is used to circulate a heat exchange medium, which is used to exchange heat with at least two battery cells. The current collector has a liquid inlet and a confluence channel communicating with the liquid inlet. The at least one medium flow channel is communicating with the confluence channel. The outer surface of the port and the current collector each have a connecting portion, and the other has a toothed portion. The connecting portion forms a groove, and the toothed portion is disposed in the groove. The depth of the groove is 0.1 to 0.5 times the wall thickness of the connecting portion.

[0135] The battery device provided in this application embodiment includes a heat exchange component for exchanging heat with individual battery cells. The inlet port can be used to inject or discharge heat exchange medium into the manifold. Heat exchange medium can be transported between the medium channel and the manifold. Teeth are embedded in grooves, and the teeth and grooves mesh. The depth of the groove is 0.1 to 0.5 times the wall thickness of the connection portion, balancing the connection strength between the heat exchange body and the manifold as well as the structural strength of the connection portion. This improves the connection reliability and sealing performance between the manifold and the heat exchange body, thereby enhancing the reliability of the heat exchange component.

[0136] The battery device 100 provided in the embodiments of this application is further described below with reference to the accompanying drawings. Please refer to the accompanying drawings. Figure 2 This application provides a battery device 100, which includes a heat exchange assembly 2 and at least two battery cells 1.

[0137] Please see Figures 3 to 6 This application provides a heat exchange component 2, which includes a heat exchange body 21 and a flow collector 22.

[0138] The heat exchange body 21 has at least one medium flow channel 21a, which extends through at least one end of the heat exchange body 21 along the first direction X to form a port portion 210a. The at least one medium flow channel 21a is used to circulate the heat exchange medium, which is used to exchange heat with at least two battery cells 1.

[0139] The manifold 22 has an inlet 22a and a flow channel 22b connected to the inlet 22a, and at least one medium flow channel 21a is connected to the flow channel 22b.

[0140] The outer surface of the port portion 210a and the current collector 22 have a connecting portion 201 and a toothed portion 202. The connecting portion 201 forms a groove 201a, and the toothed portion 202 is disposed in the groove 201a. The depth H1 of the groove 201a is 0.1 to 0.5 times the wall thickness H3 of the connecting portion 201.

[0141] The heat exchange medium is a flowable fluid, and the specific type of heat exchange medium is not limited here, as long as it can achieve a heat exchange effect on the battery cell 1. For example, it can be in a gaseous or liquid state. In this embodiment, a coolant is used as an example for the heat exchange medium.

[0142] The medium flow channel 21a is used to circulate the heat exchange medium. The heat exchange medium does not directly contact the battery cell 1, but exchanges heat with at least two battery cells 1 through the heat exchange body 21.

[0143] The principle of heat exchange body 21 for heat exchange of battery cell 1 is as follows: heat exchange medium output from heat exchange medium source (not shown in the figure) enters heat exchange body 21, heat exchange medium exchanges heat with battery cell 1, and then heat exchange medium is discharged from heat exchange body 21. The heat exchange medium can continuously circulate to enter and exit heat exchange body 21 to realize heat exchange of battery cell 1.

[0144] Here, the heat exchange body 21 can exchange heat with the battery cell 1 by either dissipating heat from the battery cell 1 or by heating the battery cell 1.

[0145] The principle of heat exchange body 21 for heat dissipation of battery cell 1 is as follows: heat exchange medium output from heat exchange medium source enters heat exchange body 21, heat exchange medium absorbs the heat generated by battery cell 1 during operation, and then heat exchange medium is discharged from heat exchange body 21 to complete the cooling and heat dissipation of battery cell 1.

[0146] The principle of the heat exchange body 21 heating the battery cell 1 is as follows: the heat exchange medium output from the heat exchange medium source enters the heat exchange body 21, the heat exchange medium transfers heat to the battery cell 1, and after heating the battery cell 1, the heat exchange medium is discharged from the heat exchange body 21, thus completing the heating of the battery cell 1.

[0147] The heat exchanger body 21 can form one or more medium flow channels 21a.

[0148] The medium flow channel 21a penetrates at least one end of the heat exchange body 21 along the first direction X to form a port portion 210a. This means that the medium flow channel 21a can penetrate one end of the heat exchange body 21 along the first direction X, so that the heat exchange body 21 has one port portion 210a; or the medium flow channel 21a can penetrate both ends of the heat exchange body 21 along the first direction X, so that the heat exchange body 21 has two port portions 210a.

[0149] At least one medium flow channel 21a is used for the flow of heat exchange medium, meaning that there may be one, two or more medium flow channels 21a used for the flow of heat exchange medium.

[0150] The inlet 22a can be used to inject or discharge heat exchange medium into the manifold 22b. The inlet 22a can be connected to the thermal management system, which provides heat exchange medium at different temperatures.

[0151] For example, multiple medium flow channels 21a may be connected to a confluence flow channel 22b, so that the heat exchange medium in the multiple medium flow channels 21a can be collected into the confluence flow channel 22b, or the heat exchange medium in the confluence flow channel 22b can be divided into multiple streams and enter the multiple medium flow channels 21a.

[0152] For example, in some embodiments, the outer surface of the port portion 210a has a connecting portion 201, and the current collector 22 has a toothed portion 202. In other embodiments, the current collector 22 has a connecting portion 201, and the outer surface of the port portion 210a has a toothed portion 202.

[0153] The depth of the groove 201a is denoted as H1, and the wall thickness of the connecting part 201 is denoted as H3. Then, 0.1*H3≤H1≤0.5*H3.

[0154] Preferably, the depth H1 of the groove 201a can be 0.3 times the wall thickness of the connecting part 201.

[0155] For example, the depth H1 of the groove 201a is 0.1 times, 0.2 times, 0.3 times, 0.4 times, or 0.5 times the wall thickness H3 of the connecting part 201, etc.

[0156] To reduce the risk of loosening at the connection interface between the heat exchanger body 21 and the manifold 22, the depth H1 of the groove 201a should be as deep as possible. However, if the depth H1 of the groove 201a is too deep, it will affect the remaining portion H2 at the location of the groove 201a (see [link to relevant documentation]). Figure 6 Due to the thickness of the groove 201, the connecting part 201 is prone to breakage. Therefore, in order to balance the gas-sealing requirements of the heat exchange component 2 and the strength requirements during use, the depth H1 of the groove 201a is 0.1 to 0.5 times the wall thickness H3 of the connecting part 201.

[0157] The battery device 100 provided in this application embodiment includes a heat exchange component 2 for exchanging heat with the battery cell 1. An inlet 22a can be used to inject or discharge heat exchange medium into the manifold 22b. Heat exchange medium can be transported between the medium flow channel 21a and the manifold 22b. Teeth 202 are embedded in grooves 201a, and the teeth 202 and grooves 201a mesh. The depth H1 of the groove 201a is 0.1 to 0.5 times the wall thickness H3 of the connecting part 201, balancing the connection strength between the heat exchange body 21 and the collector 22 as well as the structural strength of the connecting part 201. This improves the connection reliability and sealing performance between the collector 22 and the heat exchange body 21, thereby enhancing the reliability of the heat exchange component 2.

[0158] In some embodiments, please refer to Figures 3 to 4 The heat exchanger body 21 can be a harmonica tube. The medium flow channel 21a extends along the first direction X, and multiple medium flow channels 21a are arranged along the second direction Y. The second direction Y is perpendicular to the first direction X. The first direction X can be consistent with the length direction of the heat exchanger body 21, and the second direction Y can be consistent with the width direction of the heat exchanger body 21.

[0159] In some embodiments, all battery cells 1 and heat exchange components 2 can be located within the housing 3. The housing 3 can be used to house the battery cells 1, heat exchange components 2, and other structural components, providing protection for the battery cells 1, heat exchange components 2, and other structural components, and preventing foreign objects outside the housing 3 from affecting the charging or discharging of the battery cells 1.

[0160] In some embodiments, please refer to Figure 2 The housing 3 includes a cover 31 and a housing body 32 with an opening. The cover 31 closes the opening of the housing body 32 to jointly define a receiving cavity. The receiving cavity is used to house the battery cell 1, the heat exchange assembly 2, and other structural components.

[0161] The shape of the box 3 is not limited. For example, the box 3 can be a simple three-dimensional structure such as a single hexahedron, cylinder, or sphere, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as hexahedrons, cylinders, or spheres. In one example, the box 3 can be a cuboid shape, with both its length and width directions parallel to the horizontal plane, and its length direction parallel to the longest side of the cuboid.

[0162] The material of the enclosure 3 is not limited. For example, the material of the enclosure 3 can be metal materials such as aluminum alloy or iron alloy, or polymer materials such as polycarbonate or polyisocyanurate foam, or composite materials such as glass fiber and epoxy resin.

[0163] In some embodiments, the heat exchange body 21 may abut against the battery cell 1 or be connected through a thermally conductive structure.

[0164] A thermally conductive structure refers to a structure manufactured using a good conductor of heat. For example, the thermal conductivity of the thermally conductive structure is not less than 30 W / (m·K). The thermally conductive structure has good thermal conductivity and connection function. The thermally conductive structure can establish a heat conduction path between the heat exchange body 21 and the battery cell 1, thereby improving heat exchange efficiency.

[0165] The specific material of the thermally conductive structure is not limited. For example, the thermally conductive structure includes, but is not limited to, thermally conductive adhesives, etc.

[0166] In some embodiments, please refer to Figure 2 The terminal post of the battery cell 1 faces the top and bottom direction on one side. At least two battery cells 1 are arranged along a third direction to form a single cell unit. At least two single cell units are distributed along a fourth direction. The third direction, the fourth direction and the top and bottom direction are perpendicular to each other. A heat exchange body 21 is provided on at least one side of the single cell unit along the fourth direction.

[0167] The fact that the terminal post of battery cell 1 faces either the top or the bottom means that the terminal post can face either the top or the bottom.

[0168] The bottom side refers to the direction facing the ground, while the top side is the opposite direction.

[0169] The provision of a heat exchange body 21 on at least one side of a single unit along the fourth direction means that the heat exchange body 21 may be provided on one side of the single unit along the fourth direction, while there is no heat exchange body 21 on the other side; or the heat exchange body 21 may be provided on both sides of the single unit along the fourth direction. Thus, at least two single units may be provided with one or more heat exchange bodies 21 as needed.

[0170] For example, the large surface of the battery cell 1 can face the fourth direction, and the heat exchange body 21 can abut against or be connected to the large surface of the battery cell 1 through a heat-conducting structure.

[0171] The large surface of battery cell 1 is the surface with the largest area of ​​battery cell 1.

[0172] In this embodiment, a heat exchange body 21 is provided on at least one side of the single cell along the fourth direction. The heat exchange body 21 is located on the side of the battery cell 1. The heat exchange body 21 can not only exchange heat with the battery cell 1, but also adjust the temperature of the battery cells 1 at different positions according to the needs. It can also isolate adjacent single cells and reduce the risk of thermal runaway.

[0173] In some embodiments, a collector 22 is provided at one end of the heat exchange body 21 along the first direction X, while no collector 22 is provided at the other end of the heat exchange body 21 along the first direction X. In this embodiment, the collector 22 has two inlet ports 22a and two confluence channels 22b. One inlet port 22a is used to inject the heat exchange medium, and the other inlet port 22a is used to discharge the heat exchange medium. The two confluence channels 22b are respectively connected to different medium channels 21a. With this design, the heat exchange medium can flow in a tortuous and rotating manner within the heat exchange body 21.

[0174] In some embodiments, the heat exchange body 21 is provided with flow collectors 22 at both ends along the first direction X. In this embodiment, each flow collector 22 may have a liquid inlet 22a and a flow channel 22b, wherein the liquid inlet 22a of one flow collector 22 is used to inject the heat exchange medium, and the liquid inlet 22a of the other flow collector 22 is used to discharge the heat exchange medium. With this design, the heat exchange medium can flow in approximately one direction within the heat exchange body 21.

[0175] In some embodiments, please refer to Figure 8 and Figure 10 At least one groove 201a is a closed ring surrounding the connecting portion 201.

[0176] In other words, the groove 201a surrounds the connecting part 201 and connects the two ends.

[0177] In this embodiment, the closed-loop groove 201a can form a complete sealing groove around the connection 201, which is beneficial to further improve the sealing performance between the manifold 22 and the heat exchange body 21 and reduce the risk of heat exchange medium leakage.

[0178] In some embodiments, please refer to Figure 6 The depth H1 of groove 201a is 30μm-180μm.

[0179] For example, the depth H1 of the groove 201a is any value or a value between any two of the following: 30μm, 50μm, 100μm, 150μm, 160μm, 170μm and 180μm.

[0180] In this embodiment, the depth H1 of the groove 201a is 30μm-180μm, which takes into account both the connection strength between the heat exchange body 21 and the collector 22 and the structural strength of the connection part 201.

[0181] In some embodiments, the heat exchanger body 21 is a metal structure and the manifold 22 is a plastic structure.

[0182] The heat exchanger body 21 is a metal structure, which means that the heat exchanger body 21 is made of metal material.

[0183] The fact that the manifold 22 is made of plastic means that the manifold 22 is made of plastic material.

[0184] In this embodiment, the heat exchanger body 21 is a metal structure. The thermal conductivity of the metal structure is relatively high compared to the plastic structure, resulting in good heat transfer performance and temperature resistance, which can meet the requirements of higher-rate fast charging and thermal runaway. The current collector 22 is a plastic structure. Plastic structures are lightweight and have good corrosion resistance, fatigue resistance, and insulation and pressure resistance, which helps to reduce the weight of the heat exchanger assembly 2 and achieve the lightweighting of the battery device 100.

[0185] In some embodiments, at least a portion of the manifold 22 is injection molded to the port portion 210a.

[0186] For example, a portion of the manifold 22 is injection molded to the port portion 210a; or, the entire manifold 22 is injection molded to the port portion 210a.

[0187] In this embodiment, at least a portion of the manifold 22 is injection molded to the port portion 210a. This reduces the assembly steps between the manifold 22 and the heat exchange body 21 and improves the connection reliability between the manifold 22 and the heat exchange body 21.

[0188] In some embodiments, please refer to Figures 5 to 8The manifold 22 includes a transition ring 221 and a manifold body 222. The manifold body 222 forms an infusion port 22a and a flow channel 22b. The transition ring 221 is injection molded to the port portion 210a. The transition ring 221 has a connecting portion 201 or a toothed portion 202. The manifold body 222 is connected to the transition ring 221.

[0189] The adapter ring 221 is injection molded to the port portion 210a, which can be used as an insert. The adapter ring 221 and the port portion 210a are injection molded as inserts.

[0190] In this embodiment, the adapter ring 221 and the heat exchange body 222 are manufactured separately. The adapter ring 221 is injection molded to the port portion 210a. The heat exchange body 222 is connected to the adapter ring 221. This simplifies the injection mold and facilitates demolding of the heat exchange body 21 and the adapter ring 221 after injection molding, thus reducing manufacturing difficulty.

[0191] The connection method between the manifold body 222 and the adapter ring 221 is not limited. The manifold body 222 and the adapter ring 221 can be welded, heat-pressed, bonded, riveted, or other connection methods. The manifold body 222 and the adapter ring 221 can be sealed to prevent leakage at the connection part 201 between the manifold body 222 and the adapter ring 221.

[0192] The method of manufacturing the current collection body 222 is not limited, and the current collection body 222 can also be injection molded.

[0193] In some embodiments, please refer to Figures 5 to 8 The adapter ring 221 includes a first annular portion 2211 and a second annular portion 2212. The first annular portion 2211 is disposed around the outer periphery of the port portion 210a. The first annular portion 2211 has a connecting portion 201 or a toothed portion 202. The second annular portion 2212 is connected to one end of the first annular portion 2211 that is close to the current collecting body 222 along the first direction X. The second annular portion 2212 is connected to the current collecting body 222.

[0194] Specifically, the first annular portion 2211 and the second annular portion 2212 are both approximately annular, and the second annular portion 2212 is located at one end of the first annular portion 2211 along the first direction X near the current collection body 222.

[0195] In this embodiment, the first annular portion 2211 and the second annular portion 2212 are approximately annular. The first annular portion 2211 is connected to the port portion 210a, and the second annular portion 2212 is connected to the current collection body 222. Thus, the adapter ring 221 has a simple structure, is easy to injection mold, and is easy to demold.

[0196] In some embodiments, please refer to Figure 5 and Figure 6The first annular portion 2211 has a toothed portion 202, and the port portion 210a has a connecting portion 201. The width of the first annular portion 2211 along the first direction X is not less than the total width of all the grooves 201a along the first direction X.

[0197] The width of the first annular portion 2211 along the first direction X is represented as W3, and the total width of all grooves 201a along the first direction X is represented as W4, where W3 ≥ W4.

[0198] In this embodiment, the width of the first annular portion 2211 along the first direction X is not less than the total width of all grooves 201a along the first direction X, which can reduce the risk of local stress concentration caused by pressure on the heat exchange body 21 during assembly, thereby improving the sealing performance of the heat exchange component 2 during assembly into the thermal management system and during operation.

[0199] In some embodiments, please refer to Figure 5 and Figure 6 The width of the groove 201a along the first direction X is 0.05 to 0.5 times the wall thickness H3 of the connecting part 201.

[0200] The width of the groove 201a along the first direction X is represented as W1, where 0.05*H3≤W1≤0.5*H3.

[0201] For example, the width of the groove 201a along the first direction X is 0.05 times, 0.1 times, 0.2 times, 0.3 times, or 0.5 times the wall thickness H3 of the connecting portion 201, etc.

[0202] In this embodiment, the width of the groove 201a along the first direction X is 0.05 to 0.5 times the wall thickness H3 of the connecting portion 201. The moderate width of the groove 201a along the first direction X is beneficial for the tooth portion 202 to be disposed in the groove 201a. In the embodiment where the adapter ring 221 is injection molded into the port portion 210a, the flow resistance of the adapter ring 221 during injection molding can be reduced, allowing the molten plastic particles to smoothly enter the groove 201a and combine with the port portion 210a. At the same time, the risk of deforming the port portion 210a and causing the plastic particles to be unable to enter the groove 201a is reduced.

[0203] In some embodiments, please refer to Figure 10 The connecting portion 201 forms at least two grooves 201a spaced apart along the first direction X.

[0204] For example, the number of teeth 202 can be at least two, and the at least two teeth 202 can be spaced apart along the first direction X, and each groove 201a can correspond to one tooth 202.

[0205] In this embodiment, the multiple grooves 201a and the multiple teeth 202 are engaged, which can not only enhance the connection strength, but also improve the sealing performance.

[0206] In some embodiments, please refer to Figure 5 and Figure 6 The width of the partition wall between two adjacent grooves 201a is 0.05 to 0.5 times the wall thickness H3 of the connecting part 201. Preferably, the width of the partition wall between two adjacent grooves 201a is 0.2 to 0.3 times the wall thickness H3 of the connecting part 201.

[0207] The width of the partition wall between two adjacent grooves 201a is denoted as W2, where 0.05*H3≤W2≤0.5*H3.

[0208] For example, the width of the partition wall between two adjacent grooves 201a is 0.05 times, 0.1 times, 0.2 times, 0.3 times, or 0.5 times the wall thickness H3 of the connecting part 201, etc.

[0209] In this embodiment, the width of the partition wall between two adjacent grooves 201a is 0.05 to 0.5 times the wall thickness H3 of the connecting part 201. The width of the partition wall is moderate, and the partition wall has good structural strength, which reduces the risk of deformation of the groove 201a due to deformation of the partition wall. This is beneficial for the tooth 202 to fit into the groove 201a. In the embodiment where the adapter ring 221 is injection molded into the port part 210a, the risk of deforming the port part 210a and causing plastic particles to be unable to enter the groove 201a can be reduced.

[0210] In some embodiments, the number of grooves 201a is greater than 5 and less than 100.

[0211] For example, the number of grooves 201a is any one of 6, 10, 20, 50, 80, 90 and 99 or any two of them.

[0212] In this embodiment, the number of grooves 201a is greater than 5 and less than 100. The number of grooves 201a is moderate, which can meet the structural strength requirements of the connecting part 201 and also take into account the connection strength requirements of the port part 210a and the current collector 22.

[0213] In some embodiments, please refer to Figure 5 The total width of all grooves 201a along the first direction X is not less than 0.5mm and not more than 15mm.

[0214] Specifically, 0.5mm ≤ W4 ≤ 15mm.

[0215] The unit "mm" stands for millimeter.

[0216] In this embodiment, the total width of all grooves 201a along the first direction X is not less than 0.5mm and not more than 15mm, which can satisfy the sealing requirements at the connection between the current collector 22 and the port portion 210a, and also take into account the assembly requirements of the current collector 22 and the port portion 210a.

[0217] In some embodiments, please refer to Figure 7 The groove 201a includes at least two sub-grooves, and one end of all the sub-grooves intersects.

[0218] For example, the groove 201a may include two, three or more sub-grooves.

[0219] In this embodiment, one end of all the sub-grooves intersects, and the groove 201a forms multiple forked sub-grooves, which enhances the interlocking connection strength between the tooth 202 and the groove 201a and reduces the risk of the collector 22 detaching from the heat exchange body 21 during the process of the heat exchange medium being injected into the heat exchange body 21.

[0220] In some embodiments, please refer to Figure 8 and Figure 9 The heat exchange component 2 includes a plug 23 for blocking at least one port section 210a.

[0221] For example, the blocking block 23 can be interference-fitted with the port portion 210a, that is, the blocking block 23 can abut against the inner surface of the port portion 210a, so that the blocking block 23 can block the port portion 210a.

[0222] In this embodiment, a portion of the medium flow channel 21a of the heat exchange body 21 is used for the flow of heat exchange medium, and a portion of the port portion 210a of the medium flow channel 21a is blocked by the block 23 to restrict the flow path and flow direction of the heat exchange medium and improve the heat exchange efficiency.

[0223] The material of the block 23 is not limited; the block 23 can be made of metal or non-metal. For example, the block 23 can be made of plastic.

[0224] In some embodiments, please refer to Figure 8 and Figure 9 The heat exchange assembly 2 includes a plugging member 24, which is disposed at the end of the plug block 23 away from the medium flow channel 21a, and the plugging member 24 is injection molded in the port portion 210a.

[0225] Specifically, the blocking component 24 can block part of the port section 210a.

[0226] In this embodiment, the sealing element 24 is located on the side of the plug 23 away from the medium flow channel 21a. The plug 23 and the sealing element 24 jointly seal the port portion 210a, achieving localized double sealing of the medium flow channel 21a. The sealing element 24 can further improve the sealing performance. The sealing element 24 is injection molded into the port portion 210a and is made of plastic. This reduces the assembly process between the sealing element 24 and the heat exchange body 21 and also improves the connection reliability between the sealing element 24 and the heat exchange body 21.

[0227] In other embodiments, the sealing element 24 may be made of metal or other non-metallic materials.

[0228] In some embodiments, please refer to Figure 9 and Figure 10 The end face of the heat exchange body 21 facing the sealing member 24 forms a limiting groove 21b, and the sealing member 24 forms a limiting flange, which is disposed in the limiting groove 21b.

[0229] In this embodiment, the limiting flange is embedded in the limiting groove 21b, and the connection strength between the heat exchange body 21 and the sealing member 24 is improved by the engagement of the limiting flange and the limiting groove 21b.

[0230] In some embodiments, the sealing element 24 can be injection molded onto the port portion 210a. During the injection molding process, the plastic material of the sealing element 24 flows into the limiting groove 21b, and after the plastic material solidifies, it forms a limiting flange. This facilitates a tight connection between the sealing element 24 and the heat exchange body 21, improving the injection molding strength and the sealing performance of the partial sealing.

[0231] The number of limiting grooves 21b can be one or more. When there are multiple limiting grooves 21b, the multiple limiting grooves 21b can be arranged in a similar concentric circle manner.

[0232] The number of limiting flanges and the number of limiting grooves 21b can be the same, and each limiting groove 21b corresponds to one limiting flange.

[0233] In some embodiments, at least one limiting groove 21b is a closed loop. That is, the limiting groove 21b extends circumferentially along the port portion 210a and is connected end to end.

[0234] In this embodiment, the closed-loop limiting groove 21b can form a complete sealing groove, which is beneficial to further improve the sealing performance between the sealing component 24 and the heat exchange body 21 and reduce the risk of heat exchange medium leakage.

[0235] In some embodiments, a portion of the limiting groove 21b may be arc-shaped. That is, a portion of the limiting groove 21b is not connected end to end.

[0236] In some embodiments, please refer to Figures 10 to 12 The heat exchange assembly 2 includes a plugging member 24, which is disposed at the end of the plug block 23 away from the medium flow channel 21a. The plugging member 24 includes a plugging piece 241 and a boss 242. The boss 242 is connected to the end of the plugging piece 241 near the plug head and is disposed in the port portion 210a where the plug block 23 is located.

[0237] In this embodiment, both the plug 23 and the boss 242 are disposed within the port portion 210a. The boss 242 is located on the side of the plug 23 away from the medium flow channel 21a. The plug 23 can restrict the movement of the boss 242 towards the middle area of ​​the medium flow channel 21a. The plug 23 provides a limiting function for the boss 242. The plug 23 and the boss 242 jointly seal the port portion 210a, achieving local double sealing of the medium flow channel 21a. The boss 242 can further improve the sealing performance and reduce the risk of overflow.

[0238] In some embodiments, the blocking member 24 includes a clearance hole and a blocking portion. The blocking portion is located on the side of the block 23 near the collector 22, and the clearance hole is used to avoid the port portion 210a without the block 23. In this way, the port portion 210a without the block 23 can communicate with the confluence channel 22b, and the blocking portion and the block 23 can achieve double blocking.

[0239] In an embodiment where the sealing member 24 has a boss 242, the boss 242 is connected to the sealing part.

[0240] In some embodiments, a positioning groove may be formed on the inner surface of the port portion 210a, and a positioning post may be formed on the boss 242, with the positioning post disposed within the positioning groove. Exemplarily, during the injection molding process of the sealing member 24, molten plastic particles flow into the positioning groove under high pressure and solidify within the positioning groove to form a positioning post, thereby achieving a seal and increasing the connection strength.

[0241] In some embodiments, the plug 23 can be inserted into the port portion 210a first, then the adapter ring 221 can be injection molded into the heat exchange body 21, and then the sealing member 24 can be injection molded into the heat exchange body 21. Before injection molding the adapter ring 221, the plug 23 is inserted into the end opening and is interference-fitted with the port portion 210a. In this way, during injection molding, the plug 23 can support the port portion 210a to prevent the port portion 210a from deforming under the impact of high temperature and high pressure molten plastic particles.

[0242] In some embodiments, please refer to Figure 11 The sealing component 24 is an integral structure.

[0243] The sealing component 24 is a one-piece structure, meaning that the sealing component 24 can be a one-piece molded structure.

[0244] For example, the sealing element 24 can be a one-piece structure formed by injection molding, die casting or other processes.

[0245] In this embodiment, the sealing component 24 is an integral structure, which can save the assembly process of the sealing piece 241 and simplify the assembly process.

[0246] In some embodiments, please refer to Figure 12 The sealing element 24 can be a split structure. Specifically, multiple sealing elements 24 can be manufactured separately.

[0247] The following describes the battery device 100 provided in this application embodiment further with a specific example. Please refer to [link to specific example]. Figures 2 to 6 This application provides a battery device 100, which includes a heat exchange assembly 2 and at least two battery cells 1. The heat exchange assembly 2 includes a heat exchange body 21 and a current collector 22. The heat exchange body 21 has at least one medium flow channel 21a, which extends through at least one end of the heat exchange body 21 along a first direction X to form a port portion 210a. The at least one medium flow channel 21a is used to flow a heat exchange medium, which is used to exchange heat with the at least two battery cells 1. The manifold 22 has an infusion port 22a and a confluence channel 22b communicating with the infusion port 22a, and at least one medium channel 21a communicating with the confluence channel 22b; the outer surface of the port portion 210a and the manifold 22 have a connecting portion 201, and the other has a toothed portion 202. The connecting portion 201 forms a groove 201a, and the toothed portion 202 is disposed in the groove 201a. The depth H1 of the groove 201a is 0.1 to 0.5 times the wall thickness H3 of the connecting portion 201. The heat exchanger body 21 is a metal structure, and the manifold 22 is a plastic structure. The manifold 22 includes a transition ring 221 and a manifold body 222. The manifold body 222 forms the inlet 22a and the confluence channel 22b. The transition ring 221 is injection molded to the port portion 210a. The transition ring 221 has the connecting portion 201 or the toothed portion 202. The manifold body 222 is connected to the transition ring 221.

[0248] The battery device 100 provided in this application embodiment includes a heat exchange component 2 for heat exchange with the battery cell 1. An inlet 22a can be used to inject or discharge heat exchange medium into the manifold 22b. Heat exchange medium can be transported between the medium channel 21a and the manifold 22b. Teeth 202 are embedded in grooves 201a, and the teeth 202 and grooves 201a mesh. The depth H1 of the groove 201a is 0.1 to 0.5 times the wall thickness H3 of the connecting part 201, balancing the connection strength between the heat exchange body 21 and the current collector 22, as well as the structural strength of the connecting part 201. This improves the connection reliability and sealing performance between the current collector 22 and the heat exchange body 21, thereby enhancing the reliability of the heat exchange component 2. The heat exchange body 21 is a metal structure. Metal structures have a higher thermal conductivity than plastic structures, exhibiting good heat transfer and temperature resistance, and can meet the requirements of higher-rate fast charging and thermal runaway. The current collector 22 is made of plastic, which is lightweight and has good corrosion resistance, fatigue resistance, and insulation and pressure resistance, which helps to reduce the weight of the heat exchange assembly 2 and achieve the weight reduction of the battery device 100. The adapter ring 221 and the current collector body 222 are manufactured separately. The adapter ring 221 is injection molded to the port portion 210a, and the current collector body 222 is connected to the adapter ring 221. This simplifies the injection mold and facilitates demolding of the heat exchange body 21 and the adapter ring 221 after injection molding, reducing manufacturing difficulty.

[0249] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. 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. 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. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way.

Claims

1. A battery device, characterized by, include: At least two battery cells; Heat exchange components, including: A heat exchange body is formed with at least one medium flow channel, the medium flow channel passing through at least one end of the heat exchange body along a first direction to form a port portion, at least one of the medium flow channels is used for circulating heat exchange medium, the heat exchange medium is used for exchanging heat with the at least two battery cells; A manifold has an inlet and a flow channel communicating with the inlet, and at least one of the medium channels is communicating with the flow channel. The outer surface of the port portion and one of the current collectors have a connecting portion, and the other has a toothed portion. The connecting portion forms a groove, and the toothed portion is disposed in the groove. The depth of the groove is 0.1 to 0.5 times the wall thickness of the connecting portion.

2. The battery device according to claim 1, characterized by At least one of the grooves is a closed ring surrounding the connection portion.

3. The battery device of claim 1, wherein The depth of the groove is 30μm-180μm.

4. The battery device of claim 1, wherein The heat exchanger body is a metal structure, and the manifold is a plastic structure.

5. The battery device of claim 4, wherein, At least a portion of the manifold is injection molded to the port portion.

6. The battery device of claim 4, wherein The manifold includes an adapter ring and a manifold body. The manifold body forms the infusion port and the confluence channel. The adapter ring is injection molded to the port portion. The adapter ring has the connecting portion or the toothed portion. The manifold body is connected to the adapter ring.

7. The battery device of claim 6, wherein The adapter ring includes a first annular portion and a second annular portion. The first annular portion is disposed around the outer periphery of the port portion. The first annular portion has the connecting portion or the toothed portion. The second annular portion is connected to one end of the first annular portion that is close to the current collecting body along a first direction. The second annular portion is connected to the current collecting body.

8. The battery device of claim 7, wherein, The first annular portion has the toothed portion, the port portion has the connecting portion, and the width of the first annular portion along the first direction is not less than the total width of all the grooves along the first direction.

9. The battery device of claim 1, wherein, The width of the groove along the first direction is 0.05 to 0.5 times the wall thickness of the connecting part.

10. The battery device of claim 1, wherein The connecting portion forms at least two grooves spaced apart along the first direction.

11. The battery device of claim 10, wherein, The width of the partition wall between two adjacent grooves is 0.05 to 0.5 times the wall thickness of the connecting part.

12. The battery device of claim 10, wherein, The number of grooves is greater than 5 and less than 100.

13. The battery device of claim 10, wherein, The total width of all the grooves along the first direction is not less than 0.5 mm and not more than 15 mm.

14. The battery device of claim 1, wherein, The groove includes at least two sub-grooves, and one end of all the sub-grooves intersects.

15. The battery device of claim 1, wherein, The heat exchange assembly includes a plug for sealing at least one of the port portions.

16. The battery device of claim 15, wherein, The heat exchange assembly includes a plugging component, which is disposed at the end of the plug block away from the medium flow channel, and the plugging component is injection molded into the port portion.

17. The battery device of claim 16, wherein, The heat exchange body forms a limiting groove on its end face facing the sealing member, and the sealing member forms a limiting flange, which is disposed within the limiting groove.

18. The battery device of claim 15, wherein, The heat exchange assembly includes a plugging component, which is disposed at the end of the plug block away from the medium flow channel. The plugging component includes a plugging plate and a boss. The boss is connected to the end of the plugging plate near the plug head and is disposed within the port portion where the plug block is located.

19. A heat exchange assembly, characterized by include: A heat exchange body is formed with at least one medium flow channel, the medium flow channel extending through at least one end of the heat exchange body in a first direction to form a port portion, at least one of the medium flow channels is used for circulating heat exchange medium, the heat exchange medium is used for exchanging heat with at least two battery cells; A manifold has an inlet and a flow channel communicating with the inlet, and at least one of the medium channels is communicating with the flow channel. The outer surface of the port portion and one of the current collectors have a connecting portion, and the other has a toothed portion. The connecting portion forms a groove, and the toothed portion is disposed in the groove. The depth of the groove is 0.1 to 0.5 times the wall thickness of the connecting portion.

20. An electrical device, comprising: Includes the battery device according to any one of claims 1 to 18 or the heat exchange component according to claim 19.

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