Battery monomer, battery device, energy storage device and power utilization device

Abstract

The invention provides a battery monomer, a battery device, an energy storage device and a power utilization device, the battery monomer comprises a shell, a temperature detection assembly and at least one electrode assembly, the shell comprises a plurality of shell walls defining a containing cavity, and the plurality of shell walls comprise a first shell wall; the electrode assembly is arranged in the accommodating cavity; the temperature detection assembly comprises at least one temperature detection main body and an external end electrically connected with the at least one temperature detection main body, the temperature detection main body is arranged in the accommodating cavity, and the external end penetrates through the first shell wall and is exposed from one side, back to the accommodating cavity, of the first shell wall; the temperature detection main body comprises an induction part, a flexible base material, a transmission wire and an insulation protection structure, the induction part is electrically connected with the external end socket through the transmission wire, the induction part and the transmission wire are both connected to the flexible base material, and the insulation protection structure coats the outer sides of the flexible base material, the transmission wire and the induction part. The battery monomer, the battery device, the energy storage device and the power utilization device provided by the invention are beneficial to improving the thermal management effect.

Description

Technical Field

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

[0002] The application of new energy batteries in daily life and industry is becoming increasingly widespread. For example, new energy vehicles equipped with batteries are already widely used, and batteries are also increasingly being applied in energy storage. In new energy vehicles equipped with batteries, the batteries can provide all or part of the power. In the field of energy storage, batteries can be installed in energy storage battery boxes or directly on the user side.

[0003] With the continuous development of battery technology, how to improve the thermal management effect of batteries is one of the topics that the industry needs to study. Summary of the Invention

[0004] This application provides a battery cell, a battery device, an energy storage device, and an electrical device, which helps to improve thermal management performance.

[0005] The technical solution of this application embodiment is implemented as follows: A first aspect of this application provides a battery cell, comprising: a housing including a plurality of housing walls forming a receiving cavity, the plurality of housing walls including a first housing wall; at least one electrode assembly disposed within the receiving cavity; a temperature detection assembly including at least one temperature detection body and an external terminal electrically connected to the at least one temperature detection body, the temperature detection body being disposed within the receiving cavity for detecting the temperature within the receiving cavity, the external terminal passing through the first housing wall and protruding from the side of the first housing wall facing away from the receiving cavity, the external terminal being used to connect to a sampling connector; the temperature detection body including a sensing part, a flexible substrate, a transmission wire, and an insulating protective structure, the sensing part being electrically connected to the external terminal via the transmission wire, the sensing part and the transmission wire being connected to the flexible substrate, and the insulating protective structure covering the outside of the flexible substrate, the transmission wire, and the sensing part.

[0006] In this embodiment, by placing the temperature sensing body of the temperature sensing component within the receiving cavity, the temperature inside the cavity can be detected. The temperature sensing body is electrically connected to an external terminal, which passes through the first shell wall and protrudes from the side of the first shell wall facing away from the receiving cavity. This external terminal is used to connect to a sampling connector. Thus, the temperature information detected by the temperature sensing body can be transmitted to the sampling connector through the external terminal, enabling temperature sampling. This allows for real-time acquisition of the internal temperature of the battery cell, providing more accurate temperature data and facilitating timely thermal management of the battery cell, thereby improving the thermal management effect. Furthermore, by setting the external terminal on the first shell wall, during the assembly of the battery device using battery cells, the sampling connection can be completed simply by connecting the external terminal of the battery cell to the sampling connector, making operation convenient and improving assembly efficiency. Using a flexible substrate as the carrier for the transmission wires and sensing part allows the flexible substrate to adapt to the shape of the installation space within the shell, offering strong applicability and convenient assembly, thereby improving the layout flexibility of the temperature sensing body. By covering the flexible substrate, transmission wires, and sensing element with an insulating protective structure, on the one hand, the insulating protective structure electrically isolates the transmission wires and sensing element from other electrical components inside the casing, enabling them to perform their respective functions; on the other hand, the insulating protective structure separates the transmission wires and sensing element from the electrolyte inside the casing, reducing the impact of the electrolyte on the temperature detection function of the temperature detection body, thereby improving the reliability of temperature detection and thus facilitating the improvement of the thermal management effect of the battery cells.

[0007] In some embodiments, the external terminal is formed with a mating protrusion and / or a mating groove, and the external terminal is used to mat with the sampling connector through the mating protrusion and / or the mating groove.

[0008] In this way, the external terminal is used to connect to the sampling connector by plugging, which is convenient and helps to improve assembly efficiency.

[0009] In some embodiments, the wall thickness direction of the first shell wall is the first direction, the temperature detection body includes a plurality of sensing parts, at least a portion of the sensing parts of the same temperature detection body are at different distances from the first shell wall in the first direction, and / or at least a portion of the sensing parts of the same temperature detection body are at the same distance from the first shell wall in the first direction, and are arranged at intervals along a direction perpendicular to the first direction.

[0010] In this way, the multiple sensing elements of the temperature detection unit are arranged in multiple different locations, which can detect the temperature at different locations. This allows for a more comprehensive monitoring of the internal temperature distribution of the battery cell and improves the detection accuracy in harsh environments such as high temperature and high humidity.

[0011] In some embodiments, the insulating protective structure includes a moisture barrier layer and an insulating layer, wherein the moisture barrier layer covers the outside of the flexible substrate, the transmission wire and the sensing part, and the insulating layer covers the outside of the insulating layer.

[0012] Thus, by covering the flexible substrate, transmission lines, and sensing element with a moisture-proof layer, moisture can be isolated from the transmission lines and sensing element, reducing corrosion failure caused by electrolyte moisture contact. Furthermore, covering the moisture-proof layer with an insulating layer provides electrical insulation, reducing the occurrence of short circuits.

[0013] In some embodiments, the external terminal includes an insulating substrate and a connector wire passing through the insulating substrate. The connector wire is electrically connected to the transmission wire, and the insulating substrate is connected to the flexible substrate and the insulating protective structure.

[0014] In this way, the external terminal achieves electrical connection with the temperature detection body and the sampling connector through its connector wire. The insulating substrate covers the outside of the connector wire, which not only serves as the carrier of the connector wire but also provides insulation and protection for the connector wire. It can also form a structure that mates with the sampling connector, facilitating connection operations.

[0015] In some embodiments, the wall thickness direction of the first shell wall is the first direction, the electrode assembly is a wound structure with the winding axis parallel to the first direction, at least one temperature sensing body is disposed at the winding center axis of the electrode assembly, and / or, at least one temperature sensing body is disposed on the outer peripheral side of the electrode assembly.

[0016] Thus, by placing temperature sensing elements in the middle of the electrode assembly and on its outer periphery, a three-dimensional temperature monitoring network is formed. This network can more accurately and realistically reflect the temperature of the electrode assembly and more precisely acquire the temperature of the individual battery cells. This facilitates timely thermal management of the battery cells, thereby improving the thermal management effect. Furthermore, the electrode assembly's winding axis is parallel to the first direction, and the first shell wall is located on one side of the electrode assembly along the first direction. This ensures that the distances between the temperature sensing elements located at the winding center axis and on the outer periphery of the electrode assembly and the outer terminals on the first shell wall are relatively short, which helps to shorten the length of the transmission wires, saving materials and space.

[0017] In some embodiments, the electrode assembly includes a straight portion and two bent portions. The stacking direction of the straight portion is a second direction. The two bent portions are respectively connected to the two ends of the straight portion along a third direction. The first direction, the second direction and the third direction are perpendicular to each other. At least one side of the opposite sides of the straight portion along the second direction is provided with a temperature detection body.

[0018] In this way, the temperature of the central axis of the electrode assembly and the side along the second direction can be detected, which can more accurately and realistically reflect the temperature of the electrode assembly and more accurately obtain the temperature of the battery cell. This makes it easier for the battery cell to receive appropriate thermal management in a timely manner, thereby improving the thermal management effect of the battery cell.

[0019] In some embodiments, multiple electrode assemblies are arranged along the second direction, and a temperature detection body is provided between at least two adjacent electrode assemblies.

[0020] In this way, the temperature between adjacent electrode components can be detected, which can more accurately and realistically reflect the temperature inside the battery cell, thus facilitating timely thermal management of the battery cell and improving the thermal management effect of the battery cell.

[0021] In some embodiments, multiple temperature sensing bodies are spaced apart along the second direction, and the external terminals include multiple terminal sub-parts. Each temperature sensing body has a terminal sub-part connected to one end along the first direction, and each terminal sub-part passes through the first shell wall.

[0022] In this way, by connecting the external terminal to the sampling connector, the temperature detected by each temperature detection subject can be obtained, which helps to reduce the number of parts and simplify the structure.

[0023] In some embodiments, the battery cell further includes a first seal, which is provided between the end portion and the first housing wall.

[0024] Thus, by setting the first sealing element, a sealed space is formed inside the cavity, reducing the possibility of internal electrolyte leakage, reducing thermal runaway caused by electrolyte leakage, and reducing chemical corrosion caused by leaked electrolyte.

[0025] In some embodiments, the battery cell further includes a connector, which has a plurality of mating grooves formed on one side along a first direction and a plug-in structure for plugging into a sampling connector on the opposite side. The connector is attached to the surface of the first housing wall facing away from the receiving cavity and is plugged into a plurality of end portions through the plurality of mating grooves.

[0026] Thus, by using a connector with an external terminal, the structural design of the connector makes it more suitable for insertion with the sampling connector, and also simplifies the structure of the external terminal, facilitates the assembly of the external terminal and the first shell wall, simplifies the assembly difficulty, and helps to improve assembly efficiency.

[0027] In some embodiments, the electrode assembly is a cylindrical structure, and multiple temperature sensing bodies are provided, with at least a portion of the temperature sensing bodies located on the outer periphery of the electrode assembly and arranged sequentially at intervals along the circumference of the electrode assembly.

[0028] In this way, the temperature of the central axis and outer periphery of the electrode assembly can be detected, which can more accurately and realistically reflect the temperature of the electrode assembly and more accurately obtain the temperature of the battery cell. This makes it easier for the battery cell to receive appropriate thermal management in a timely manner, thereby improving the thermal management effect of the battery cell.

[0029] In some embodiments, the temperature sensing assembly further includes a plurality of connecting portions located on the side of the electrode assembly facing the first housing wall along the first direction. Each temperature sensing body located on the outer periphery of the electrode assembly is connected to a connecting portion, and all connecting portions extend toward the winding central axis of the electrode assembly and are connected to an external terminal.

[0030] In this way, all temperature sensing elements located on the outer periphery of the electrode assembly are connected to the same external connector. By connecting the external connector to the sampling connector, the temperatures detected by each temperature sensing element can be obtained, which helps to reduce the number of parts and simplify the structure. Furthermore, the convergence and extension of multiple connecting parts allows the external connector to form a smaller connection structure, reducing the space occupied on the first shell wall.

[0031] In some embodiments, the battery cell further includes a second seal, and the second seal is provided between the external terminal and the first housing wall.

[0032] Thus, by setting the second seal, a sealed space is formed inside the cavity, reducing the possibility of internal electrolyte leakage, reducing thermal runaway caused by electrolyte leakage, and reducing chemical corrosion caused by leaked electrolyte.

[0033] In some embodiments, the battery cell further includes a heat-conducting element disposed between circumferentially adjacent temperature sensing bodies along the electrode assembly.

[0034] In this way, by setting up heat-conducting components, the heat transfer efficiency is improved, and the response speed and accuracy of temperature monitoring are enhanced.

[0035] A second aspect of this application provides a battery device comprising a plurality of battery cells provided in the first aspect.

[0036] Since the battery cells provided in the first aspect are conducive to improving thermal management, the battery device is able to improve thermal management.

[0037] A third aspect of this application provides an energy storage device, including a plurality of battery cells provided in the first aspect or a plurality of battery devices provided in the second aspect, wherein the battery cells or battery devices are used to store or provide electrical energy.

[0038] Because the battery cells provided in the first aspect are conducive to improving thermal management, the energy storage device is able to improve thermal management.

[0039] A fourth aspect of this application provides an electrical device comprising a plurality of battery cells provided in the first aspect or a plurality of battery devices provided in the second aspect, wherein the battery cells or battery devices are used to store or provide electrical energy.

[0040] Since the battery cells provided in the first aspect are beneficial to improving thermal management, the electrical device is able to improve thermal management. 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 (vehicle) according to one or more embodiments.

[0042] Figure 2 This is an exploded perspective view of a battery device according to one or more embodiments; Figure 3 This is a three-dimensional structural diagram of a first structure of a battery cell according to one or more embodiments; Figure 4 This is a three-dimensional structural diagram of a second structure of a battery cell according to one or more embodiments; Figure 5 An exploded perspective view of a first structure of a battery cell according to one or more embodiments; Figure 6 An exploded perspective view of a structure of a temperature detection component according to one or more embodiments; Figure 7 A top view of a third structure of a battery cell according to one or more embodiments; Figure 8 This is a three-dimensional structural schematic diagram of a connector according to one or more embodiments; Figure 9 A bottom view of the connector according to one or more embodiments; Figure 10 A three-dimensional structural schematic diagram of a third structure of a battery cell according to one or more embodiments in an insertion state with a sampling connector; Figure 11 for Figure 10 The main view of the structure; Figure 12 for Figure 11 Sectional view at point AA; Figure 13 for Figure 11 Sectional view at point BB; Figure 14 This is an exploded perspective view of a second structure of a battery cell according to one or more embodiments; Figure 15 for Figure 14 Enlarged view of point C in the middle; Figure 16 This is an exploded perspective view of another structure of a temperature detection component according to one or more embodiments; Figure 17 This is a front view of a second structure of a battery cell according to one or more embodiments, in the state of mating with a sampling connector; Figure 18 for Figure 17 Sectional view at point DD; Figure 19 for Figure 17 Sectional view at EE.

[0043] Explanation of reference numerals in the attached figures: 1000, Vehicle; 100, Battery Unit; 10, Battery Box; 101, Box Cover; 102, Box Body; 200, Controller; 300, Motor; 20, Battery Cell; 1, Outer Shell; 11, Housing; 12, Top Cover; 12a, First Shell Wall; 121, First Opening; 122, Second Opening; 2, Electrode Assembly; 21, Straight Section; 22, Bending Section; 3, Temperature Detection Assembly; 31, Temperature Detection Body; 311, Flexible Substrate; 312, Sensing Section; 313, Transmission Wire; 314, Insulation Protection Structure; 3141, Insulation Layer; 3142, Moisture Separation Layer; 32, External Terminal; 3 21. Terminal part; 3211. Insulating base part; 3212. Insertion protrusion; 3213. Insertion groove; 3214. Connector wire; 33. Connecting part; 331. Line protection base; 332. Connecting wire; 4. First seal; 5. Connecting seat; 51. Seat part; 511. Mating groove; 512. Insertion structure; 5121. Insertion protrusion; 5122. Protrusion structure; 52. Conductive line; 6. Second seal; 7. Heat-conducting part; 71. Recessed structure; 8. Insulating protective film; 9. Temperature sensor; 30. Sampling connector; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0044] 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.

[0045] 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 and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0046] In the description of the embodiments of this application, technical terms such as "first," "second," and "third" 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.

[0047] 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.

[0048] 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 are in an "or" relationship.

[0049] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "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, be constructed, operated or used 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, 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0051] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0052] The following is a detailed description of this application.

[0053] Currently, new energy batteries are being used more and more widely in daily life and industry. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0054] In related technologies, the temperature acquisition point of a battery cell is set on the battery cell's heat exchanger or top cover. The temperature at this location differs significantly from the internal temperature of the battery cell, making it impossible to accurately reflect the internal temperature. This affects the timeliness of thermal management of the battery cell and results in poor thermal management performance.

[0055] To this end, the inventors of this application have designed a battery cell, which includes a casing, a temperature detection component, and at least one electrode component. The casing includes multiple shell walls that form a receiving cavity, and the multiple shell walls include a first shell wall. At least one electrode component is disposed within the receiving cavity. The temperature detection component includes at least one temperature detection body and an external terminal connected to the at least one temperature detection body. The temperature detection body is disposed within the receiving cavity and is used to detect the temperature within the receiving cavity. The external terminal passes through the first shell wall and protrudes from the side of the first shell wall facing away from the receiving cavity. The external terminal is used to connect to a sampling connector.

[0056] In this design, by placing the temperature sensing body of the temperature sensing component inside the receiving cavity, the temperature within the cavity can be detected. The temperature sensing body is connected to an external terminal, which passes through the first shell wall and protrudes from the side of the first shell wall facing away from the receiving cavity. This external terminal is used to connect to the sampling connector. Thus, the temperature information detected by the temperature sensing body can be transmitted to the sampling connector through the external terminal, enabling temperature sampling. This allows for real-time acquisition of the internal temperature of the battery cell, providing more accurate temperature data and facilitating timely thermal management of the battery cell, thereby improving the thermal management effect. Furthermore, by placing the external terminal on the first shell wall, during the assembly of the battery device using battery cells, the sampling connection can be completed simply by connecting the external terminal of the battery cell to the sampling connector, making operation convenient and improving assembly efficiency.

[0057] The battery apparatus provided in this application embodiment may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via busbars.

[0058] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0059] As an example, a battery cell assembly can be a battery module, which consists of multiple battery cells arranged and fixed together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0060] In some embodiments, the battery device may be a battery pack, which includes a battery case and one or more individual battery cells housed within the battery case.

[0061] As an example, a battery cell assembly can be a battery module, which can be housed in a battery case by fixing the battery module in the battery case.

[0062] As an example, battery cell assemblies can also be housed in a battery box by directly fixing multiple battery cells to the battery box.

[0063] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[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 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 the 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 can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive 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. 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.).

[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 include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxides include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co1 / 3 Mn 1 / 3 O2 (also known as NCM333), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[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 can be a negative electrode sheet, and the negative electrode sheet can include a negative 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 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.).

[0073] As an example, the negative electrode sheet may include a negative current collector and a negative active material disposed on at least one surface of the negative 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 made of 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 contain 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 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.

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

[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. 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.

[0087] In some embodiments, the electrolyte may optionally include additives. For example, 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 phosphorus sulfide, 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 implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0095] In some implementations, the electrode assembly is 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 or negative electrode plates.

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

[0101] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0102] The technical solutions described in the embodiments of this application can be applied to electrical devices that use battery devices. The electrical device includes the battery device of any embodiment of this application, and the battery device is used to provide electrical energy.

[0103] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, aircraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Aircraft generally refer to devices that fly within or outside the atmosphere (space), and can include aircraft flying within the atmosphere and spacecraft flying in space. Aircraft can include airplanes, airships, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose special limitations on the above-mentioned electrical devices.

[0104] The technical solutions described in the embodiments of this application can be applied to various energy storage devices that use battery devices, such as energy storage containers or energy storage cabinets.

[0105] 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.

[0106] Figure 1 This is a schematic diagram of the structure of an electrical device (vehicle 1000) according to one or more embodiments.

[0107] 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 vehicles, etc. For example... Figure 1 As 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.

[0108] 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.

[0109] Figure 2 This is an exploded perspective view of a battery device 100 according to one or more embodiments.

[0110] like Figure 2 As shown, the battery device 100 includes a battery box 10 and at least one battery cell 20. The battery box 10 has a receiving space, and at least one battery cell 20 is received in the receiving space.

[0111] In some embodiments of this application, the battery box 10 may include a cover 101 and a body 102. The cover 101 and the body 102 are fastened together, forming an accommodating space inside the battery box 10 to accommodate the individual battery cells 20. This accommodating space may be sealed or unsealed.

[0112] The housing 102 can be a hollow structure with one open end, and the cover 101 can be a plate-like structure. The cover 101 closes onto the open side of the housing 102 so that the cover 101 and the housing 102 together define the receiving space. Alternatively, both the cover 101 and the housing 102 can be hollow structures with one open side, and the open side of the cover 101 closes onto the open side of the housing 102. Of course, the battery box 10 formed by the cover 101 and the housing 102 can be of various shapes, such as a cylinder, a cuboid, etc.

[0113] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of multiple battery cells 20 is placed in the receiving space formed by the housing 102 and the cover 101. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is then housed within the receiving space formed by the housing 102 and the cover 101. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0114] Below, refer to Figures 3 to 19 Some embodiments of this application will be described in detail.

[0115] In the description of the embodiments of this application, for ease of explanation, the direction of arrow X represents the "first direction", the direction of arrow Y represents the "second direction", and the direction of arrow Z represents the "third direction". Among them, the first direction X, the second direction Y, and the third direction Z intersect each other perpendicularly.

[0116] Figure 3 This is a three-dimensional structural diagram of a first structure of a battery cell according to one or more embodiments; Figure 4 This is a three-dimensional structural diagram of a second structure of a battery cell according to one or more embodiments; Figure 5An exploded perspective view of a first structure of a battery cell according to one or more embodiments; Figure 6 An exploded perspective view of a structure of a temperature detection component according to one or more embodiments; Figure 7 A top view of a third structure of a battery cell according to one or more embodiments; Figure 8 This is a three-dimensional structural schematic diagram of a connector according to one or more embodiments; Figure 9 A bottom view of the connector according to one or more embodiments; Figure 10 A three-dimensional structural schematic diagram of a third structure of a battery cell according to one or more embodiments in an insertion state with a sampling connector; Figure 11 for Figure 10 The main view of the structure; Figure 12 for Figure 11 Sectional view at point AA; Figure 13 for Figure 11 Sectional view at point BB; Figure 14 This is an exploded perspective view of a second structure of a battery cell according to one or more embodiments; Figure 15 for Figure 14 Enlarged view of point C in the middle; Figure 16 This is an exploded perspective view of another structure of a temperature detection component according to one or more embodiments; Figure 17 This is a front view of a second structure of a battery cell according to one or more embodiments, in the state of mating with a sampling connector; Figure 18 for Figure 17 Sectional view at point DD; Figure 19 for Figure 17 Sectional view at EE.

[0117] The first aspect of this application provides a battery cell 20, such as Figures 3 to 5 As shown, the battery cell 20 includes a housing 1, a temperature detection component 3, and at least one electrode component 2. The housing 1 includes multiple shell walls that form a receiving cavity, including a first shell wall 12a. The electrode component 2 is disposed within the receiving cavity. The temperature detection component 3 includes at least one temperature detection body 31 and an external terminal 32 electrically connected to the at least one temperature detection body 31. The temperature detection body 31 is disposed within the receiving cavity and is used to detect the temperature within the receiving cavity. The external terminal 32 passes through the first shell wall 12a and protrudes from the side of the first shell wall 12a facing away from the receiving cavity. The external terminal 32 is used to connect to a sampling connector 30.

[0118] Electrode assembly 2 is the component in the battery cell 20 where the electrochemical reaction occurs. The casing 1 may contain one or more electrode assemblies 2. Electrode assembly 2 includes a positive electrode, a negative electrode, and a separator, with the separator disposed between the negative and positive electrode. The positive electrode includes a positive current collector and a positive active material layer disposed on at least one surface of the positive current collector. The positive active material layer is coated on the surface of the positive current collector; the positive current collector includes a positive current collector portion and a positive current collector protruding from the positive current collector portion. The positive current collector portion is coated with the positive active material layer, and at least a portion of the positive current collector protruding from the positive current collector portion is not coated with the positive active material layer, serving as a positive electrode tab. The negative electrode sheet includes a negative current collector and a negative active material layer disposed on at least one surface of the negative current collector, the negative active material layer being coated on the surface of the negative current collector; the negative current collector includes a negative current collector portion and a negative current convex portion protruding from the negative current collector portion, the negative current collector portion being coated with the negative active material layer, at least a portion of the negative current convex portion not being coated with the negative active material layer, the negative current convex portion serving as a negative electrode tab.

[0119] The outer casing 1 is a component with a cavity isolated from the external environment. This cavity houses the electrode assembly 2, the electrolyte, and other components. The outer casing 1 can be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite casing 1), or aluminum-plastic film. In some embodiments, the outer casing 1 can be a sealed structure or a non-sealed structure. As an example, when the outer casing 1 is a non-sealed structure, it protects the electrode assembly 2. A sealing bag is also included between the outer casing 1 and the electrode assembly 2 to encapsulate the electrode assembly 2 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the outer casing 1 is a sealed structure, it encapsulates the electrode assembly 2 and the electrolyte, among other components. Exemplarily, the outer casing 1 can be cylindrical or prismatic. Prismatic shapes include square shells, blade shapes, and multi-faceted prisms, such as hexagonal prisms. This application does not impose any particular limitation.

[0120] In some embodiments of this application, such as Figure 5 As shown, the outer casing 1 includes a top cover 12 and a housing 11. The housing 11 has an opening, and the top cover 12 closes the opening of the housing 11 to form a receiving cavity. The electrode assembly 2 is disposed in the receiving cavity.

[0121] It is understandable that, such as Figure 5 As shown, the top cover 12 is a shell wall, and the shell 11 is formed by connecting multiple other shell walls. One of the shell walls of the shell 11 can serve as the first shell wall 12a, or the top cover 12 can serve as the first shell wall 12a.

[0122] The top cover 12 is a component that closes onto the opening of the housing 11 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the top cover 12 can be adapted to the shape of the housing 11 to fit it. Optionally, the top cover 12 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the top cover 12 is less prone to deformation under pressure and impact, allowing the battery cell 20 to have higher structural strength and improved safety performance. The top cover 12 or the housing 11 is provided with terminals, which are electrically connected to the electrode assembly 2 for outputting or inputting electrical energy.

[0123] For example, the top cover 12 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The top cover 12 can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0124] For example, an insulating element may also be provided on the inner side of the top cover 12. The insulating element can be used to isolate the electrical connection components inside the housing 11 from the top cover 12 to reduce the risk of short circuit. For example, the insulating element may be made of plastic, rubber, etc.

[0125] The housing 11 is a component used to cooperate with the top cover 12 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 2, electrolyte, and other components. The housing 11 and the top cover 12 can be independent components. An opening can be provided on the housing 11, and the top cover 12 closes the opening to form the internal environment of the battery cell 20. The housing 11 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing 11 can be determined according to the specific shape and size of the electrode assembly 2. The housing 11 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic; this embodiment does not impose any special limitations on these materials.

[0126] For example, the housing 11 has openings at opposite ends, and the top cover 12 has two openings, which are respectively closed to isolate the internal environment of the battery cell 20 from the external environment. Both top covers 12 may be provided with pressure relief mechanisms, or one of the two top covers 12 may be provided with a pressure relief mechanism, or neither of the two top covers 12 may be provided with a pressure relief mechanism.

[0127] For example, such as Figure 5 As shown, at least two electrode assemblies 2 are provided. The at least two electrode assemblies 2 can be connected in series, in parallel, or in a mixed manner. A mixed connection means that at least two electrode assemblies 2 are connected in both series and parallel. The at least two electrode assemblies 2 can be directly connected in series, in parallel, or in a mixed manner, and then the whole assembly consisting of the at least two electrode assemblies 2 is placed in the receiving cavity formed by the top cover 12 and the housing 11.

[0128] The temperature sensing body 31 is the main component of the temperature sensing assembly 3 used for temperature detection, and it can detect the temperature of its surrounding environment. The temperature sensing body 31 can be configured to adapt to its spatial shape, for example, it can be configured as a flat plate, a curved plate, or other regular or irregular shape. It is understood that the temperature sensing body 31 is electrically connected to the external terminal 32 and can transmit the detected temperature information to the external terminal 32.

[0129] It is understood that at least a portion of the external terminal 32 penetrates within the first housing wall 12a, with a portion of the external terminal 32 protruding from the side of the first housing wall 12a facing away from the receiving cavity. The external terminal 32 may extend outwards beyond the outer surface of the first housing wall 12a, or it may not extend beyond the outer surface of the first housing wall 12a, but only protrudes through an opening formed on the outer surface of the first housing wall 12a. The external terminal 32 may employ, but is not limited to, a plug-in structure.

[0130] The sampling connector 30 can be a connector in the battery management system of the battery device 100 for connecting to the battery cell 20, thereby enabling the acquisition of temperature information. The sampling connector 30 may adopt, but is not limited to, a plug-in structure.

[0131] For example, a temperature detection body 31 is provided, and an external terminal 32 is provided, and the two are electrically connected.

[0132] For example, there are multiple temperature sensing bodies 31 and one external terminal 32, and all temperature sensing bodies 31 are electrically connected to the same external terminal 32.

[0133] In this embodiment, by placing the temperature sensing body 31 of the temperature sensing component 3 inside the receiving cavity, the temperature inside the receiving cavity can be detected. The temperature sensing body 31 is electrically connected to an external terminal 32, which passes through the first shell wall 12a and protrudes from the side of the first shell wall 12a facing away from the receiving cavity. This external terminal 32 is used to connect to the sampling connector 30. Thus, the temperature information detected by the temperature sensing body 31 can be transmitted to the sampling connector 30 through the external terminal 32, enabling temperature sampling. This allows for real-time acquisition of the internal temperature of the battery cell 20, providing more accurate temperature data and facilitating timely thermal management of the battery cell 20, thereby improving the thermal management effect. Furthermore, by providing the external terminal 32 on the first shell wall 12a, during the assembly of the battery device 100 using the battery cells 20, the sampling connection can be completed simply by connecting the external terminal 32 of the battery cell 20 to the sampling connector 30, making the operation convenient and improving assembly efficiency.

[0134] In some embodiments, such as Figure 3 and Figure 4 As shown, the external terminal 32 is formed with a plugging protrusion 3212 and / or a plugging groove 3213, and the external terminal 32 is used to plug into the sampling connector 30 through the plugging protrusion 3212 and / or the plugging groove 3213.

[0135] For example, such as Figure 3 and Figure 6 As shown, the external terminal 32 includes an insulating base portion 3211 and a connector wire 3214 passing through the insulating base portion 3211. Part of the insulating base portion 3211 passes through the first shell wall 12a, and another part passes outward from the outer surface of the first shell wall 12a. The part that passes out serves as a plug-in protrusion 3212.

[0136] For example, such as Figure 15 As shown, the external terminal 32 includes an insulating base portion 3211 and a connector wire 3214 partially inserted into the insulating base portion 3211. The insulating base portion 3211 has a recessed insertion groove 3213 facing the receiving cavity. A portion of the connector wire 3214 extends into the insertion groove 3213 through the bottom wall of the insertion groove 3213.

[0137] For example, the insertion direction of the insertion protrusion 3212 and / or insertion groove 3213 is parallel to the wall thickness direction of the first shell wall 12a.

[0138] Thus, the external terminal 32 is used to connect to the sampling connector 30 by plugging, which is convenient and helps to improve assembly efficiency.

[0139] Of course, it is understood that the connection method of the external terminal 32 is not limited to plugging. In some embodiments, the external terminal 32 can be connected to the sampling connector 30 by welding, snap-fitting, or bolting.

[0140] In some embodiments, such as Figure 5 , Figure 6 , Figure 14 and Figure 16 As shown, the wall thickness direction of the first shell wall 12a is the first direction X. The temperature detection body 31 includes a plurality of sensing parts 312. At least a portion of the sensing parts 312 of the same temperature detection body 31 are at different distances from the first shell wall 12a in the first direction X, and / or at least a portion of the sensing parts 312 of the same temperature detection body 31 are at the same distance from the first shell wall 12a in the first direction X, and are arranged at intervals in a direction perpendicular to the first direction X.

[0141] It is understood that the sensing part 312 is a component used to sense changes in the temperature around it, such as, but not limited to, thermistors, platinum resistance thermometers, thermocouples, semiconductor temperature sensors, infrared temperature sensors, ceramic semiconductors, copper wire, platinum wire, nickel wire, palladium-silver alloy, etc.

[0142] For example, at least a portion of the sensing parts 312 of the same temperature sensing body 31 are at different distances from the first shell wall 12a in the first direction X, and are arranged in a gradient with equal spacing.

[0143] For example, at least a portion of the sensing parts 312 of the same temperature sensing body 31 are at the same distance from the first shell wall 12a in the first direction X, and are arranged at equal intervals in a direction perpendicular to the first direction X.

[0144] In this way, the multiple sensing parts 312 of the temperature detection body 31 are arranged in multiple different positions, which can detect the temperature at different positions and comprehensively monitor the internal temperature distribution of the battery cell 20, thereby improving the detection accuracy in harsh environments such as high temperature and high humidity.

[0145] Of course, the temperature detection body 31 is not limited to including multiple sensing units 312. In some embodiments, the temperature detection body 31 includes one sensing unit 312.

[0146] In some embodiments, such as Figure 6 As shown, the temperature detection body 31 also includes a flexible substrate 311 and a transmission wire 313. Each sensing part 312 is electrically connected to an external terminal 32 through the transmission wire 313. Both the sensing part 312 and the transmission wire 313 are connected to the flexible substrate 311.

[0147] Flexible substrate 311 refers to a thin-film substrate material with bendable, rollable, and foldable properties. Flexible substrate 311 can adapt to curved surfaces, withstand deformation, and maintain the functionality of electronic devices. Optional materials for flexible substrate 311 include, but are not limited to, polyimide, polyester, polyethylene terephthalate, polyetheretherketone, and fluoropolymers.

[0148] The forming method of the transmission wire 313 and the sensing part 312 on the flexible substrate 311 can be, but is limited to, etching, addition and printing.

[0149] For example, a layered etching method is used to form the transmission line 313 and the sensing part 312 on the flexible substrate 311.

[0150] Thus, by using a flexible substrate 311 as the carrier for the transmission wire 313 and the sensing part 312, the flexible substrate 311 can adapt to the shape of the installation space inside the housing 1, making it highly applicable and easy to assemble, thereby improving the layout flexibility of the temperature detection body 31.

[0151] Of course, it is understood that the carriers of the transmission wire 313 and the sensing part 312 are not limited to using flexible substrate 311. In some embodiments, rigid substrates can be used as carriers of the transmission wire 313 and the sensing part 312.

[0152] In some embodiments, such as Figure 6 As shown, the temperature detection body 31 also includes an insulating protective structure 314, which covers the outside of the flexible substrate 311, the transmission wire 313 and the sensing part 312.

[0153] It is understood that the conductive wire encased within the insulating protective structure 314 is a transmission wire 313, and the end of the transmission wire 313 is connected to the connector wire 3214 of the external terminal 32.

[0154] For example, the sensing elements 312 are all covered by an insulating protective structure 314.

[0155] Thus, by covering the flexible substrate 311, the transmission wire 313, and the sensing part 312 with an insulating protective structure 314, on the one hand, the insulating protective structure 314 electrically isolates the transmission wire 313 and the sensing part 312 from other electrical components inside the housing 1, reducing the risk of short circuits and enabling them to perform their respective functions. On the other hand, the insulating protective structure 314 separates the transmission wire 313 and the sensing part 312 from the electrolyte inside the housing 1, reducing the impact of the electrolyte on the temperature detection function of the temperature detection body 31, thereby improving the reliability of temperature detection and thus improving the thermal management effect of the battery cell 20.

[0156] In some embodiments, such as Figure 6 As shown, the insulating protective structure 314 includes an insulating layer 3141 and a moisture barrier layer 3142. The moisture barrier layer 3142 covers the outside of the flexible substrate 311, the transmission wire 313 and the sensing part 312, and the insulating layer 3141 covers the outside of the insulating layer 3141.

[0157] For example, the insulating layer 3141 may be, but is not limited to, polyethylene terephthalate (PET) insulating film, polyethylene naphthalate (PEN) insulating film, etc.

[0158] For example, the moisture barrier layer 3142 can be made of aluminum-plastic film. Aluminum-plastic film has properties of resistance to electrolytes and greases, which can prevent electrolytes from corroding the flexible substrate 311, transmission wires 313, and sensing element 312, improving the structural integrity of the temperature detection body 31 and thus enhancing the reliability of temperature detection. Furthermore, the high thermal conductivity of aluminum allows the sensing element 312 to sense the average surface temperature rather than a single point temperature, improving the accuracy of temperature detection.

[0159] For example, the moisture barrier 3142 may be made of fluoroplastics. Fluoroplastics include soluble polytetrafluoroethylene (PFA), ethylene-tetrafluoroethylene copolymer (ETFE), or polyvinylidene fluoride (PVDF).

[0160] Thus, by covering the flexible substrate 311, the transmission wire 313, and the sensing part 312 with a moisture barrier layer 3142, moisture can be isolated from the transmission wire 313 and the sensing part 312, reducing corrosion failure caused by electrolyte moisture contacting the transmission wire 313 and the sensing part 312. Furthermore, covering the moisture barrier layer 3142 with an insulating layer 3141 provides electrical insulation, reducing the occurrence of short circuits.

[0161] In some embodiments, such as Figure 6 As shown, the external terminal 32 includes an insulating substrate 3211 and a connector wire 3214 passing through the insulating substrate 3211. The connector wire 3214 is electrically connected to the transmission wire 313. The insulating substrate 3211 is connected to the flexible substrate 311 and the insulating protective structure 314.

[0162] For example, the interconnected connector wires 3214 and the transmission wires 313 are integrally formed.

[0163] For example, the insulating substrate 3211 is connected to the end face of the flexible substrate 311 and the insulating protective structure 314 along the first direction X towards the first shell wall 12a.

[0164] See Figure 6 The boundary line between the connector wire 3214 and the transmission wire 313 is shown by a dashed line in the figure. The conductive line below the dotted line is the transmission wire 313, and the conductive line above the dotted line is the connector wire 3214. The connector wire 3214 passes through the insulating base part 3211. The insulating base part 3211 and the connector wire 3214 together constitute at least part of the external terminal 32.

[0165] For example, connector wire 3214 and transmission wire 313 are connected by soldering.

[0166] For example, the insulating substrate portion 3211 is formed with a plugging protrusion 3212 and / or a plugging groove 3213.

[0167] For example, the insulating substrate 3211 may be made of, but is not limited to, plastics, such as soluble polytetrafluoroethylene (PFA), ethylene-tetrafluoroethylene copolymer (ETFE), or polyvinylidene fluoride (PVDF).

[0168] Thus, the external terminal 32 achieves electrical connection with the temperature detection body 31 and the sampling connector 30 through its connector wire 3214. The insulating substrate 3211 covers the outside of the connector wire 3214, which not only serves as the carrier of the connector wire 3214 but also provides insulation and protection for the connector wire 3214. It can also form a structure that cooperates with the sampling connector 30, which facilitates the connection operation.

[0169] In some embodiments, such as Figure 5 and Figure 14 As shown, the wall thickness direction of the first shell wall 12a is the first direction X, the electrode assembly 2 is a wound structure with the winding axis parallel to the first direction X, at least one temperature sensing body 31 is disposed at the winding center axis of the electrode assembly 2, and / or, at least one temperature sensing body 31 is disposed on the outer peripheral side of the electrode assembly 2.

[0170] For example, the electrode assembly 2 can be flat or cylindrical.

[0171] For example, before manufacturing the electrode assembly 2, a hollow tube is placed first, and then the electrode assembly 2 is wound around it to form an electrode assembly 2 with a hollow structure, and then the temperature detection body 31 is inserted into the space in the middle.

[0172] Thus, by setting a temperature detection body 31 at the center of the electrode assembly 2 and setting temperature detection bodies 31 on the outer periphery of the electrode assembly 2, a three-dimensional temperature monitoring network is formed. This network can more accurately and realistically reflect the temperature of the electrode assembly 2 and more precisely obtain the temperature of the battery cell 20. This facilitates timely thermal management of the battery cell 20, thereby improving the thermal management effect of the battery cell 20. In addition, the winding axis of the electrode assembly 2 is parallel to the first direction X, and the first shell wall 12a is located on one side of the electrode assembly 2 along the first direction X. This makes the distance between the temperature detection bodies 31 located at the winding center axis and the outer periphery of the electrode assembly 2 and the outer end 32 located on the first shell wall 12a relatively short, which helps to shorten the length of the transmission wire 313, saving materials and space.

[0173] Of course, it is understood that the electrode assembly 2 is not limited to a wound structure; in some embodiments, the electrode assembly 2 can be a stacked structure.

[0174] In some embodiments, such as Figure 13 As shown, the electrode assembly 2 includes a straight portion 21 and two bent portions 22. The stacking direction of the straight portion 21 is the second direction Y. The two bent portions 22 are respectively connected to the two ends of the straight portion 21 along the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other. At least one side of the straight portion 21 along the opposite sides of the second direction Y is provided with a temperature detection body 31.

[0175] It should be noted that, as Figure 13 As shown in the figure, the two dotted lines represent the dividing line between the straight part 21 and the bent part 22. The part between the two dotted lines represents the straight part 21, and the part on the opposite side of the two dotted lines represents the bent part 22. This type of electrode assembly 2 has a flat structure, and the second direction Y is the thickness direction of the flat structure.

[0176] For example, the outer shell 1 is a square shell.

[0177] For example, a flat temperature sensing body 31 is provided at the winding center axis of the electrode assembly 2.

[0178] For example, each of the opposite sides of the electrode assembly 2 along the second direction Y is provided with a temperature detection body 31, and each temperature detection body 31 is a flat plate structure.

[0179] In this way, the temperature of the central axis of the electrode assembly 2 and the side along the second direction Y can be detected, which can more accurately and realistically reflect the temperature of the electrode assembly 2 and more accurately obtain the temperature of the battery cell 20. This makes it easier for the battery cell 20 to be subjected to corresponding thermal management in a timely manner, thereby improving the thermal management effect of the battery cell 20.

[0180] Of course, it is understood that the temperature detection body 31 is not limited to being provided on both the side of the electrode assembly 2 along the second direction Y and at the winding center axis. In some embodiments, the temperature detection body 31 may be provided only at the winding center axis, or only on the side of the electrode assembly 2 along the second direction Y, or on the side of the electrode assembly 2 along the third direction Z, or on the side of the electrode assembly 2 facing away from the first shell wall 12a.

[0181] In some embodiments, such as Figure 13 As shown, multiple electrode assemblies 2 are arranged along the second direction Y, and a temperature detection body 31 is provided between at least two adjacent electrode assemblies 2.

[0182] For example, the temperature sensing body 31 disposed between adjacent electrode assemblies 2 has a flat plate structure.

[0183] In this way, the temperature between adjacent electrode components 2 can be detected, which can more accurately and realistically reflect the temperature inside the battery cell 20, thereby facilitating timely thermal management of the battery cell 20 and improving the thermal management effect of the battery cell 20.

[0184] In some embodiments, such as Figure 3 and Figure 5As shown, the temperature detection body 31 is provided with multiple portions at intervals along the second direction Y, and the external end 32 includes multiple end portions 321. Each temperature detection body 31 is connected to an end portion 321 at one end along the first direction X, and each end portion 321 passes through the first shell wall 12a.

[0185] For example, two electrode assemblies 2 are provided along the second direction Y. A temperature detection body 31 is provided at the central axis of each electrode assembly 2, between the two electrode assemblies 2, and on the opposite side of the two electrode assemblies 2 along the second direction Y. Each temperature detection body 31 is connected to a terminal sub-part 321, and all terminal sub-parts 321 together constitute an external terminal 32.

[0186] For example, such as Figure 6 As shown, the external terminal 32 includes multiple terminal sub-parts 321. Each terminal sub-part 321 includes an insulating substrate 3211 and a connector wire 3214 passing through the insulating substrate 3211. The insulating substrate 3211 is connected to the flexible substrate 311 and the insulating protective structure 314 of the temperature detection body 31. The connector wire 3214 is electrically connected to the transmission wire 313 of the temperature detection body 31.

[0187] For example, such as Figure 3 As shown, each end portion 321 extends beyond the outer surface of the first shell wall 12a, and the extended portion serves as a plugging protrusion 3212. All plugging protrusions 3212 are used to plug into the same connector 5.

[0188] For example, the end portion 321 extends through the first shell wall 12a along the first direction X.

[0189] In this way, by connecting the external terminal 32 to the sampling connector 30, the temperature detected by each temperature detection body 31 can be obtained, which helps to reduce the number of parts and simplify the structure.

[0190] In some embodiments, such as Figure 5 and Figure 6 As shown, the battery cell 20 also includes a first sealing element 4, which is provided between the end portion 321 and the first shell wall 12a.

[0191] Specifically, the first shell wall 12a has a first opening 121, the end portion 321 protrudes through the first opening 121, and a first sealing element 4 is sealed between the outer peripheral surface of the end portion 321 and the hole wall of the first opening 121.

[0192] For example, the first seal 4 is sealed between the insulating substrate portion 3211 and the wall of the first opening 121.

[0193] For example, the first seal 4 may be made of, but is not limited to, an elastomeric material, such as nitrile rubber, hydrogenated nitrile rubber, EPDM rubber, silicone rubber, etc.

[0194] Thus, by setting the first sealing element 4, a sealed space is formed inside the cavity, reducing the possibility of internal electrolyte leakage, reducing thermal runaway caused by electrolyte leakage, and reducing chemical corrosion caused by leaked electrolyte.

[0195] In some embodiments, such as Figures 7 to 12 As shown, the battery cell 20 also includes a connector 5. The connector 5 has a plurality of mating grooves 511 formed on one side along the first direction X, and a plugging structure 512 for plugging into the sampling connector 30 is formed on the opposite side. The connector 5 is attached to the surface of the first shell wall 12a facing away from the receiving cavity, and is plugged into a plurality of end parts 321 through the plurality of mating grooves 511.

[0196] For example, such as Figure 8 and Figure 9 As shown, the connector 5 includes a seat body 51 and conductive lines 52 passing through the seat body 51. The seat body 51 has a plurality of mating grooves 511 formed on one side along the first direction X, and a plurality of insertion protrusions 5121 formed on the opposite side. The number of mating grooves 511 and the plurality of insertion protrusions 5121 are the same and are arranged in a one-to-one correspondence. The bottom walls of the corresponding insertion protrusions 5121 and the mating grooves 511 are provided with a plurality of conductive lines 52. The plurality of insertion protrusions 5121 are arranged closer to the plurality of mating grooves 511 in the second direction Y. The size of the insertion protrusions 5121 along the third direction Z is smaller than the size of the mating grooves 511 along the third direction Z. The seat portion 51 also has a protruding structure 5122 that surrounds all the plugging protrusions 5121 on the side where the plugging protrusions 5121 are provided. The protruding structure 5122, all the plugging protrusions 5121, and the space between the protruding structure 5122 and the plugging protrusions 5121 together constitute the plugging structure 512 of the connecting seat 5.

[0197] For example, the groove 511 is interference-fitted with the end portion 321.

[0198] Thus, by using a connector 5 in conjunction with the external terminal 32, the structural design of the connector 5 makes it more suitable for insertion into the sampling connector 30, and simplifies the structure of the external terminal 32, making it easier to assemble the external terminal 32 with the first shell wall 12a, simplifying the assembly difficulty and improving the assembly efficiency.

[0199] Of course, it is understood that the battery cell 20 is not limited to including the connector 5. In some embodiments, the battery cell 20 does not include the connector 5, and the battery cell 20 can be directly connected to the sampling connector 30 through the external terminal 32.

[0200] In some embodiments, such as Figures 14 to 19 As shown, the electrode assembly 2 has a cylindrical structure, and multiple temperature detection bodies 31 are provided. At least a portion of the temperature detection bodies 31 are located on the outer periphery of the electrode assembly 2 and are arranged sequentially at intervals along the circumference of the electrode assembly 2.

[0201] For example, the outer shell 1 is a cylindrical shell.

[0202] For example, a cylindrical temperature sensing body 31 is provided at the winding central axis of the electrode assembly 2.

[0203] For example, the outer periphery of the electrode assembly 2 is provided with a plurality of arc-shaped temperature sensing bodies 31.

[0204] In this way, the temperature of the central axis and the outer periphery of the electrode assembly 2 can be detected, which can more accurately and realistically reflect the temperature of the electrode assembly 2 and more accurately obtain the temperature of the battery cell 20. This makes it easier for the battery cell 20 to be subjected to corresponding thermal management in a timely manner, thereby improving the thermal management effect of the battery cell 20.

[0205] Of course, it is understood that the temperature detection body 31 is not limited to being provided on both the outer periphery of the electrode assembly 2 and the winding center axis. In some embodiments, the temperature detection body 31 may be provided only at the winding center axis or only on the outer periphery of the electrode assembly 2.

[0206] In some embodiments, such as Figure 14 and Figure 15 As shown, the temperature detection assembly 3 also includes a plurality of connecting parts 33. The connecting parts 33 are located on the side of the electrode assembly 2 facing the first shell wall 12a along the first direction X. Each temperature detection body 31 located on the outer periphery of the electrode assembly 2 is connected to a connecting part 33. All connecting parts 33 extend toward the winding central axis of the electrode assembly 2 and are connected to the external end 32.

[0207] For example, the external terminal 32 shares a central axis with the electrode assembly 2.

[0208] For example, the connecting portion 33 extends radially along the electrode assembly 2, with one end of the connecting portion 33 near the winding central axis of the electrode assembly 2 connected to the external terminal 32, and the other end connected to the temperature detection body 31.

[0209] For example, such as Figure 16As shown, the temperature detection body 31 includes a flexible substrate 311, a transmission wire 313, a sensing part 312, and an insulating protective structure 314. Each sensing part 312 is electrically connected to an external terminal 32 through the transmission wire 313. The sensing part 312 and the transmission wire 313 are both connected to the flexible substrate 311. The insulating protective structure 314 covers the outside of the flexible substrate 311, the transmission wire 313, and the sensing part 312. The insulating protective structure 314 is formed by hot pressing aluminum-plastic film and PET insulating film.

[0210] For example, the connection portion 33 includes a line protection substrate 331 and a connecting wire 332 passing through the line protection substrate 331. The connecting wire 332 extends radially along the electrode assembly 2, with one end connected to the transmission wire 313 of the temperature detection body 31 and the other end connected to the connector wire 3214 of the external terminal 32. The line protection substrate 331 extends radially along the electrode assembly 2, with one end connected to the insulating protection structure 314 and the other end connected to the insulating substrate portion 3211 of the external terminal 32. The line protection substrate 331, the insulating protection structure 314, and the insulating substrate portion 3211 are integrally formed. For example, the line protection substrate 331, the insulating protection structure 314, and the insulating substrate portion 3211 are made of the same material.

[0211] For example, such as Figure 15 As shown, the external terminal 32 includes an insulating base portion 3211 and a connector wire 3214 partially inserted into the insulating base portion 3211. The insulating base portion 3211 has a recessed insertion groove 3213 facing the receiving cavity. A portion of the connector wire 3214 extends into the insertion groove 3213 through the bottom wall of the insertion groove 3213.

[0212] For example, the temperature sensing body 31 located at the winding center axis of the electrode assembly 2 is connected to the external terminal 32.

[0213] In this way, all temperature sensing bodies 31 located on the outer periphery of the electrode assembly 2 are connected to the same external terminal 32. By connecting the external terminal 32 to the sampling connector 30, the temperatures detected by each temperature sensing body 31 can be obtained, which helps to reduce the number of parts and simplify the structure. Furthermore, the convergence and extension of multiple connecting parts 33 helps to form a smaller connecting structure for the external terminal 32, reducing the space occupied on the first shell wall 12a.

[0214] In some embodiments, such as Figure 14 and Figure 19 As shown, the battery cell 20 also includes a second sealing element 6, which is provided between the external end 32 and the first shell wall 12a.

[0215] Specifically, the first shell wall 12a has a second opening 122, the insulating base portion 3211 of the external end 32 passes through the second opening 122, and a second sealing member 6 is sealed between the outer peripheral surface of the insulating base portion 3211 and the hole wall of the second opening 122.

[0216] For example, the second seal 6 may be made of, but is not limited to, elastomeric materials, such as nitrile rubber, hydrogenated nitrile rubber, EPDM rubber, silicone rubber, etc.

[0217] For example, the seal of the first shell wall 12a meets the IP68 protection requirement.

[0218] Thus, by setting the second sealing element 6, a sealed space is formed inside the cavity, reducing the possibility of internal electrolyte leakage, reducing thermal runaway caused by electrolyte leakage, and reducing chemical corrosion caused by leaked electrolyte.

[0219] In some embodiments, such as Figure 14 , Figure 17 and Figure 18 As shown, the battery cell 20 also includes a heat-conducting element 7, which is disposed between adjacent temperature sensing bodies 31 along the circumferential direction of the electrode assembly 2.

[0220] For example, a heat-conducting element 7 is provided in the space enclosed between any two circumferentially adjacent temperature sensing bodies 31 of the electrode assembly 2, the outer peripheral surface of the electrode assembly 2, and the inner wall of the outer casing 1.

[0221] For example, the heat-conducting element 7 can come into contact with the temperature sensing body 31.

[0222] For example, the heat-conducting element 7 may contact the outer peripheral surface of the electrode assembly 2.

[0223] For example, the heat-conducting element 7 may contact the inner wall of the housing 1.

[0224] In the embodiments of this application, the contact can be direct contact, or contact through an intermediate medium layer, or contact between two contacting objects with essentially no interaction force, or contact between two contacting objects with interaction force.

[0225] For example, the outer periphery of the electrode assembly 2 is covered with an insulating film, and the heat-conducting element 7 is in contact with the outer surface of the insulating film.

[0226] For example, the thermal conductive component 7 may be made of, but is not limited to, thermally conductive silicone pads, ceramic sheets, alumina sheets, etc.

[0227] For example, such as Figure 14As shown, the temperature sensing body 31 located on the outer periphery of the electrode assembly 2 has a recessed structure 71 formed on both end faces along the circumferential direction, and the heat-conducting element 7 has a raised structure formed on both end faces along the circumferential direction. The surface of the raised structure is in contact with and connected to the surface of the recessed structure 71.

[0228] For example, the recessed structure 71 has a recessed depth of 0.5 mm.

[0229] Thus, by setting up the heat-conducting component 7, the heat transfer efficiency is improved, and the response speed and accuracy of temperature monitoring are enhanced.

[0230] In some embodiments, such as Figure 14 and Figure 18 As shown, both the outer peripheral surface of the electrode assembly 2 and the inner peripheral surface of the electrode assembly 2 facing its winding central axis are covered with an insulating protective film 8. The insulating protective film 8 separates the electrode assembly 2 from the temperature sensing body 31 and from the heat-conducting element 7. Exemplarily, the insulating protective film 8 is, but is not limited to, a PET insulating film.

[0231] In some embodiments, such as Figure 19 As shown, a temperature sensor 9 is also provided on the side of the electrode assembly 2 facing away from the first housing wall 12a. Exemplarily, the temperature sensor 9 is, but not limited to, a positive temperature coefficient thermistor (PTC thermistor).

[0232] A second aspect of this application provides a battery device 100, including a plurality of battery cells 20 provided in the first aspect.

[0233] For example, the battery device 100 includes a battery management system (BMS), and the external terminal 32 of the battery cell 20 is connected to the sampling connector 30 of the battery management system. The controller of the battery management system calculates the locations of the highest and lowest temperatures of the battery cell 20 in real time based on the resistance changes of each sensing element 312.

[0234] Since the battery cell 20 provided in the first aspect is conducive to improving thermal management, the battery device 100 is able to improve thermal management.

[0235] A third aspect of this application provides an energy storage device, including a plurality of battery cells 20 provided in the first aspect or a plurality of battery devices 100 provided in the second aspect, wherein the battery cells 20 or battery devices 100 are used to store or provide electrical energy.

[0236] Since the battery cell 20 provided in the first aspect is conducive to improving thermal management, the energy storage device is able to improve thermal management.

[0237] The fourth aspect of this application provides an electrical device including a plurality of battery cells 20 provided in the first aspect or a plurality of battery devices 100 provided in the second aspect, wherein the battery cells 20 or battery devices 100 are used to store or provide electrical energy.

[0238] Since the battery cell 20 provided in the first aspect is conducive to improving thermal management, the electrical device is able to improve thermal management.

[0239] The following describes specific examples of some embodiments of this application with reference to the accompanying drawings.

[0240] As a specific example, a square-shell battery cell (cell 20) is provided. The square-shell battery cell includes a cell housing (outer shell 1), a bare cell (electrode assembly 2), a flexible sheet-like temperature sensor assembly (temperature detection assembly 3), a top cover wiring structure (external terminal 32), and a parallel female terminal connector (connector 5). The battery cell housing serves as the structural foundation, providing installation reference and protection. The bare battery cell is a wound structure located within the battery cell housing cavity. A temperature sensor (temperature detection body 31) is arranged in the middle layer of the winding, and multiple temperature sensors are arranged on the outer side walls. Each temperature sensor group includes a flexible substrate (flexible substrate 311), a thermistor metal wire array etched on the surface of the flexible substrate (multiple sensing parts 312 and multiple transmission wires 313), and an aluminum-plastic film layer (moisture isolation layer 3142) and a Mylar insulating film layer (insulating layer 3141) covering the outside of the metal wire array. Signal lines (transmission wires 313 and connector wires 3214) pass through the opening (first opening 121) of the battery cell top cover (first shell wall 12a), and a silicone sealing ring (first sealing element 4) is provided at the edge of the opening. The ends of the signal lines are all connected to the insertion holes (fitting grooves 511) of the parallel female connector (connector 5), which is embedded in the mounting groove reserved in the top cover by interference fit.

[0241] As another concrete example, a cylindrical battery cell is provided, comprising a flexible insert-type temperature sensor (temperature sensing body 31), a battery cell housing (outer shell 1), a bare battery cell (electrode assembly 2), a thermally conductive structure (thermal conductive element 7), and a connector (external terminal 32). The flexible insert-type temperature sensor is embedded in the electrode winding axis of the bare battery cell through a winding process, and multiple temperature sensors (temperature sensing bodies 31) are attached to the sidewalls of the bare battery cell. The thermally conductive structure is a thermally conductive silicone pad, which fills the spaces between the temperature sensors spaced circumferentially along the bare battery cell. The connector adopts a parallel female terminal joint and integrates overcurrent protection function.

[0242] The above embodiments are merely illustrative of 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 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 all should be covered within the scope of the 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.

Claims

1. A battery cell, characterized in that, include: The outer shell includes a plurality of shell walls that form a receiving cavity, the plurality of shell walls including a first shell wall; At least one electrode assembly is disposed within the receiving cavity; A temperature detection assembly includes at least one temperature detection body and an external terminal electrically connected to the at least one temperature detection body. The temperature detection body is disposed in the receiving cavity and is used to detect the temperature in the receiving cavity. The external terminal passes through the first shell wall and protrudes from the side of the first shell wall facing away from the receiving cavity. The external terminal is used to connect to a sampling connector. The temperature detection body includes a sensing element, a flexible substrate, a transmission wire, and an insulating protective structure. The sensing element is electrically connected to the external terminal through the transmission wire. Both the sensing element and the transmission wire are connected to the flexible substrate. The insulating protective structure covers the outside of the flexible substrate, the transmission wire, and the sensing element.

2. The battery cell according to claim 1, characterized in that, The external terminal has a plug-in protrusion and / or a plug-in groove, and the external terminal is used to plug into the sampling connector through the plug-in protrusion and / or the plug-in groove.

3. The battery cell according to claim 1, characterized in that, The wall thickness direction of the first shell wall is the first direction. The temperature detection body includes a plurality of sensing parts, at least a portion of the sensing parts of the same temperature detection body are at different distances from the first shell wall in the first direction, and / or at least a portion of the sensing parts of the same temperature detection body are at the same distance from the first shell wall in the first direction, and are arranged at intervals along a direction perpendicular to the first direction.

4. The battery cell according to claim 1, characterized in that, The insulating protective structure includes a moisture barrier layer and an insulating layer. The moisture barrier layer covers the outside of the flexible substrate, the transmission wire, and the sensing part, and the insulating layer covers the outside of the insulating layer.

5. The battery cell according to claim 1, characterized in that, The external terminal includes an insulating substrate and a connector wire passing through the insulating substrate. The connector wire is electrically connected to the transmission wire, and the insulating substrate is connected to the flexible substrate and the insulating protective structure.

6. The battery cell according to any one of claims 1 to 5, characterized in that, The wall thickness direction of the first shell wall is the first direction, and the electrode assembly is a wound structure with the winding axis parallel to the first direction. At least one of the temperature sensing elements is located at the winding center axis of the electrode assembly, and / or at least one of the temperature sensing elements is located on the outer peripheral side of the electrode assembly.

7. The battery cell according to claim 6, characterized in that, The electrode assembly includes a straight portion and two bent portions. The straight portion is stacked in a second direction. The two bent portions are connected to the two ends of the straight portion along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The temperature detection body is provided on at least one side of the two opposite sides of the straight portion along the second direction.

8. The battery cell according to claim 7, characterized in that, The electrode assemblies are arranged in multiple ways along the second direction, and the temperature detection body is provided between at least two adjacent electrode assemblies.

9. The battery cell according to claim 7 or 8, characterized in that, The temperature detection elements are arranged in multiple intervals along the second direction. The external terminal includes multiple terminal sub-parts, and each of the temperature detection bodies is connected to one end of the terminal sub-part along the first direction, and each terminal sub-part passes through the first shell wall.

10. The battery cell according to claim 9, characterized in that, The battery cell also includes a first sealing element, which is provided between the end portion and the first shell wall.

11. The battery cell according to claim 9, characterized in that, The battery cell also includes a connector, which has a plurality of mating grooves on one side along the first direction and a plug-in structure for plugging into the sampling connector on the opposite side. The connector is attached to the surface of the first shell wall facing away from the receiving cavity and is plugged into the plurality of end parts through the plurality of mating grooves.

12. The battery cell according to claim 6, characterized in that, The electrode assembly has a cylindrical structure. The temperature detection body is provided in multiple ways, and at least a portion of the temperature detection bodies are located on the outer periphery of the electrode assembly and are arranged sequentially at intervals along the circumference of the electrode assembly.

13. The battery cell according to claim 12, characterized in that, The temperature detection assembly further includes multiple connecting parts, which are located on the side of the electrode assembly facing the first shell wall along the first direction. Each of the temperature detection bodies located on the outer periphery of the electrode assembly is connected to one of the connecting parts. All the connecting parts extend toward the winding central axis of the electrode assembly and are connected to the external end.

14. The battery cell according to claim 13, characterized in that, The battery cell also includes a second sealing element, which is provided between the external terminal and the first shell wall.

15. The battery cell according to any one of claims 12 to 14, characterized in that, The battery cell also includes a heat-conducting element disposed between the temperature sensing bodies that are circumferentially adjacent to the electrode assembly.

16. A battery device, characterized in that, It includes multiple battery cells as described in any one of claims 1 to 15.

17. An energy storage device, characterized in that, It includes a plurality of battery cells as described in any one of claims 1 to 15 or a plurality of battery devices as described in claim 16, wherein the battery cells or the battery devices are used to store or provide electrical energy.

18. An electrical appliance, characterized in that, It includes a plurality of battery cells as described in any one of claims 1 to 15 or a plurality of battery devices as described in claim 16, wherein the battery cells or the battery devices are used to store or provide electrical energy.

Images