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

Abstract

The utility model provides a battery monomer, a battery device, an energy storage device and a power utilization device. Wherein the battery monomer comprises a shell and an electrode assembly accommodated in the shell, the shell is provided with an opening, an end cover seals the opening, the end cover is provided with an electrode terminal, the electrode terminal is electrically connected with the electrode assembly, the electrode terminal is sleeved with a first insulating part on one side, far away from the electrode assembly, of the end cover, and the first insulating part is arranged along a first direction perpendicular to the thickness direction of the end cover; a heat absorbing piece is arranged between the electrode terminal and the first insulating piece, and the heat absorbing piece is respectively attached to the electrode terminal and the first insulating piece. According to the invention, the risk of temperature rise cracking of the insulating part during assembly can be reduced to a certain extent, and the reliability of the insulating part and the battery monomer is improved.

Description

Technical Field

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

[0002] New energy batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already widely used. In addition, batteries are being used more and more in the field of energy storage.

[0003] In battery-powered new energy vehicles, batteries can provide all or part of the power. In the energy storage field, batteries can be installed in energy storage enclosures or directly on the user side. In battery manufacturing, defects such as cracking and damage to insulation components can occur, affecting battery reliability. Therefore, reducing the risk of insulation component cracking and damage is one of the research topics in the industry. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides a battery cell, a battery device, an energy storage device, and an electrical device.

[0005] This application is achieved through the following technical solution.

[0006] A first aspect of this application provides a battery cell, the battery cell including a housing and an electrode assembly housed in the housing, the housing having an opening, an end cap closing the opening, the end cap having an electrode terminal electrically connected to the electrode assembly, the electrode terminal having a first insulating member sleeved on the side of the end cap away from the electrode assembly, and a heat-absorbing member disposed between the electrode terminal and the first insulating member along a first direction perpendicular to the thickness direction of the end cap, the heat-absorbing member being in contact with the electrode terminal and the first insulating member respectively.

[0007] Because a heat-absorbing element is provided between the electrode terminal and the first insulating component, and the heat-absorbing element is in contact with both the electrode terminal and the first insulating component, the heat-absorbing element can absorb the heat from the electrode terminal and the first insulating component during the welding process of the electrode terminal. This reduces the risk of the first insulating component overheating and cracking to a certain extent, and improves the reliability of the battery cell.

[0008] In some embodiments, the heat absorber includes a phase change material block having a melting point temperature of 25 to 65°C.

[0009] Therefore, the heat-absorbing component includes a phase change material block. The phase change material can change its phase state during heating and cooling to store heat. When welding the electrode terminals, the phase change material block can absorb a large amount of latent heat with almost no temperature change, further reducing the risk of the first insulating component heating up and cracking.

[0010] In some embodiments, the phase change material block is a paraffin-carbon fiber composite material block or a paraffin-aluminum foam material block.

[0011] Therefore, paraffin phase change materials have a wide phase change temperature range, as well as high latent heat of phase change and good chemical stability, which can improve the reliability of battery cells; composite thermally conductive materials can increase the thermal conductivity of phase change materials and further enhance the heat absorption capacity of phase change material blocks.

[0012] In some embodiments, when viewed along the thickness direction of the end cap, the first insulating member is formed in a ring shape and sleeved on the outer edge of the electrode terminal; along the first direction, the width of the heat-absorbing member is not less than one-quarter of the difference between the outer edge of the first insulating member and the outer edge of the electrode terminal, and the width of the heat-absorbing member is not greater than half of the difference between the outer edge of the first insulating member and the outer edge of the electrode terminal.

[0013] Because the width of the heat-absorbing component is within a suitable range, it is possible to balance the heat absorption effect with the structural strength of the first insulating component, thereby reducing the impact on the structural strength of the end cap.

[0014] In some embodiments, when viewed along the thickness direction of the end cap, the inner edge of the first insulating member is shaped along the outer edge of the electrode terminal; along the circumference of the first insulating member, the distance between the inner edge and the outer edge of the first insulating member is the same.

[0015] Therefore, the shape of the first insulating component can be adapted to the outer edge shape of the electrode terminal, reducing the processing difficulty of the first insulating component and improving assembly efficiency.

[0016] In some embodiments, a positioning member is provided between the first insulating member and the end cap along the thickness direction of the end cap. The positioning member is arranged around the outer periphery of the heat-absorbing member, and the first insulating member is engaged with the positioning member.

[0017] Since the positioning element is arranged around the outer periphery of the heat absorber, and the first insulating element is engaged with the positioning element, the engaging connection structure is simple, easy to install and disassemble, and has high connection strength and good stability. Thus, the structure formed by the positioning element and the first insulating element can be used to improve the overall strength of the first insulating element and the end cover, avoid the deformation of the first insulating element caused by squeezing or other reasons, and improve the reliability of the battery cell.

[0018] In some embodiments, the positioning member is provided with a locking groove, the first insulating member is provided with a protrusion that engages with the locking groove, and the heat-absorbing member is provided with a relief portion that avoids the protrusion.

[0019] Therefore, the engagement groove and the protrusion can be used to achieve rapid positioning and improve assembly efficiency. In addition, the shape of the heat-absorbing part can be matched with the engagement structure formed by the positioning part and the first insulating part, which further facilitates assembly.

[0020] In some embodiments, the electrode terminal includes a terminal plate and an electrode post connected to the terminal plate, the heat absorber is disposed around the terminal plate, and the electrode post is configured to be electrically connected to the electrode assembly.

[0021] Therefore, the terminal block can be electrically connected to external conductive components such as busbars, increasing the current-carrying area and thus increasing the current-carrying capacity of the battery cells.

[0022] In some embodiments, a seal is further provided between the electrode terminal and the end cap along the thickness direction of the end cap.

[0023] Therefore, when the electrode terminal is installed on the battery cell, the sealing element can seal the gap between the electrode terminal and the end cap, reducing the risk of air or liquid leakage from the battery cell through the gap in the end cap, and improving the reliability of the battery cell.

[0024] In some embodiments, the battery cell further includes a second insulating member disposed on the side of the end cap near the electrode assembly, the second insulating member being configured to insulatingly isolate the end cap from the electrode assembly.

[0025] Since the second insulating element can be disposed on the side of the end cap close to the electrode assembly, the second insulating element can insulate and isolate the end cap from the electrode assembly, thereby improving the insulation effect between the electrode assembly and the end cap.

[0026] A second aspect of this application provides a battery device including a plurality of battery cells provided in the first aspect of this application.

[0027] Since the battery device includes the battery cell disclosed in the first aspect of the embodiments of this application, it can reduce the risk of the first insulating component heating up and cracking during the assembly of the battery cell to a certain extent, which is beneficial to improving the assembly efficiency and reliability of the battery device.

[0028] A third aspect of the present application provides an energy storage device, including multiple battery cells provided in the first aspect of the present application or multiple battery devices provided in the second aspect of the present application, wherein the battery cells or the battery devices are used to store or provide electrical energy.

[0029] Since the energy storage device includes the battery cell disclosed in the first aspect of the present application or the battery device provided in the second aspect of the present application, it can reduce the risk of the first insulating component heating up and cracking during the assembly of the battery cell to a certain extent, which is beneficial to improving the assembly efficiency and reliability of the energy storage device.

[0030] A fourth aspect of the present application provides an electrical device, including a battery cell provided in the first aspect of the present application, a battery device provided in the second aspect of the present application, or an energy storage device provided in the third aspect of the present application, wherein the battery cell or the battery device is used to store or provide electrical energy.

[0031] Therefore, to a certain extent, the risk of the first insulating component cracking due to overheating during battery cell assembly can be reduced, which is beneficial to improving the assembly efficiency and reliability of electrical devices.

[0032] This application can reduce the risk of insulation components cracking due to overheating during assembly to a certain extent, and improve the reliability of insulation components and battery cells. Attached Figure Description

[0033] 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:

[0034] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0035] Figure 2 An exploded perspective view of a battery provided for some embodiments of this application;

[0036] Figure 3 An exploded perspective view of a battery provided for some embodiments of this application;

[0037] Figure 4 Exploded perspective view of the end cap provided for some embodiments of this application;

[0038] Figure 5 A cross-sectional schematic diagram of an end cap provided for some embodiments of this application;

[0039] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0040] Figure 7 Schematic diagrams of the heat-absorbing element provided for some embodiments of this application;

[0041] Figure 8Schematic diagrams of the heat-absorbing element provided in other embodiments of this application;

[0042] Figure 9 Schematic diagrams of electrode terminals provided for other embodiments of this application;

[0043] Figure 10 A schematic diagram of the structure of the first insulating element provided for some embodiments of this application;

[0044] Figure 11 This is a schematic diagram of the structure of an energy storage device provided in some embodiments of this application.

[0045] Explanation of reference numerals in the attached figures

[0046] 1. Battery cell; 2. Housing; 2A. Opening; 3. End cap; 4. Electrode terminal; 4A. Terminal plate; 4B. Terminal post; 5. Electrode assembly; 6. First insulating component; 6A. Protrusion; 7. Heat-absorbing component; 7A. Clearance component; 8. Positioning component; 8A. Engaging groove; 9. Sealing component; 10. Second insulating component; 11. Explosion-proof valve; 12. Adapter component; 100. Battery assembly; 101. Housing; 102. Cover; 103. Base plate; 200. Controller; 300. Motor; 1000. Vehicle; 2000. Energy storage device. Detailed Implementation

[0047] 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.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] The following is a detailed description of this application.

[0056] 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.

[0057] In battery manufacturing, when heat treatment is performed on electrode terminals, there is a problem where the insulating components crack and break due to temperature rise, affecting the insulation effect of the insulating components and the reliability of the battery.

[0058] Through research and design, a heat-absorbing component that fits between the insulating component and the electrode terminal can absorb some heat. When the electrode terminal is subjected to heat treatment, the risk of the insulating component cracking and breaking due to temperature rise can be reduced to a certain extent, thereby improving the reliability of the insulating component.

[0059] Based on this design concept, this application designs a battery cell, which includes a housing and an electrode assembly housed in the housing. The housing has an opening, and an end cap closes the opening. The end cap is provided with an electrode terminal, which is electrically connected to the electrode assembly. A first insulating member is sleeved on the side of the end cap away from the electrode assembly. A heat-absorbing member is provided between the electrode terminal and the first insulating member in a first direction perpendicular to the thickness direction of the end cap. The heat-absorbing member is in contact with the electrode terminal and the first insulating member respectively.

[0060] Because a heat-absorbing element is provided between the electrode terminal and the first insulating component, and the heat-absorbing element is in contact with both the electrode terminal and the first insulating component, the heat-absorbing element can absorb the heat from the electrode terminal and the first insulating component during the welding process of the electrode terminal. This reduces the risk of the first insulating component overheating and cracking to a certain extent, and improves the reliability of the battery cell.

[0061] 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.

[0062] Figure 1 The diagram illustrates the structure of a vehicle 1000 as provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Figure 1As shown, a battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0063] 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.

[0064] Figure 2 This is an exploded perspective view of the battery device 100 provided in an embodiment of this application. Figure 2 As shown, the battery device 100 includes a base plate 103, a cover 102 and at least one battery cell 1. The cover 102 covers the base plate 103, thereby forming a space for accommodating the battery cell 1 between the base plate 103 and the cover 102.

[0065] In this embodiment of the application, the battery cell 1 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.

[0066] The battery cell 1 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0067] Although not illustrated, a single battery cell 1 generally includes an electrode assembly 5. The electrode assembly 5 includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the single battery cell 1, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0068] In some embodiments, the electrode assembly 5 is provided with tabs (not shown) that can conduct current from the electrode assembly 5. The tabs include a positive tab and a negative tab.

[0069] In some embodiments, the battery cell 1 may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be a steel housing, an aluminum housing, a plastic housing (such as a polypropylene housing), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film, etc.

[0070] As an example, the battery cell 1 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0071] In some embodiments, such as Figure 3 As shown, the outer casing includes a housing 2 and an end cap 3. The housing 2 has an opening 2A, and the end cap 3 closes the opening 2A to form a sealed space for accommodating the electrode assembly 5 and substances such as electrolytes. The housing 2 may have one or more openings 2A. The end cap 3 may also have one or more.

[0072] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, it serves to protect the electrode assembly 5, and a sealing bag is included between the housing and the electrode assembly 5. The sealing bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film.

[0073] In some embodiments, such as Figure 3 As shown, at least one electrode terminal 4 is provided on the outer casing, and the electrode terminal 4 is electrically connected to a tab (not shown). The electrode terminal 4 can be directly connected to the tab, or it can be indirectly connected to the tab through an adapter. The electrode terminal 4 can be provided on the end cap 3, or it can be provided on the housing 2.

[0074] The emissions from battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0075] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0076] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0077] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0078] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0079] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0080] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0081] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0082] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0083] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0084] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0085] Below, refer to Figures 3 to 11 Some embodiments of this application will be described in detail.

[0086] Figure 3 An exploded perspective view of a battery provided for some embodiments of this application; Figure 4 Exploded perspective view of the end cap provided for some embodiments of this application; Figure 5 A cross-sectional schematic diagram of an end cap provided for some embodiments of this application; Figure 6 for Figure 5 Enlarged view of point A in the middle; Figure 7 Schematic diagrams of the heat-absorbing element provided for some embodiments of this application; Figure 8Schematic diagrams of the heat-absorbing element provided in other embodiments of this application; Figure 9 Schematic diagrams of electrode terminals provided for other embodiments of this application; Figure 10 A schematic diagram of the structure of the first insulating element provided for some embodiments of this application; Figure 11 This is a schematic diagram of the structure of an energy storage device provided in some embodiments of this application.

[0087] In some embodiments of this application, for ease of explanation, a first direction, a thickness direction of the end cap, and a circumferential direction of the electrode assembly are defined, wherein the first direction intersects the thickness direction of the end cap. For example... Figures 3 to 9 As shown by the arrows, the first direction is perpendicular to the thickness direction of the end cap. The direction where arrow Z is located is the thickness direction of the end cap, and the direction where arrow X is located is the first direction.

[0088] The first aspect of this application provides a battery cell 1, such as... Figure 3 , Figure 4 As shown, the battery cell 1 includes a housing 2 and an electrode assembly 5 housed in the housing 2. The housing 2 has an opening 2A, and an end cap 3 closes the opening 2A. The end cap 3 is provided with an electrode terminal 4, which is electrically connected to the electrode assembly 5. A first insulating member 6 is sleeved on the side of the end cap 3 away from the electrode assembly 5. A heat-absorbing member 7 is provided between the electrode terminal 4 and the first insulating member 6 along a first direction (X) perpendicular to the thickness direction (Z) of the end cap 3. The heat-absorbing member 7 is in contact with the electrode terminal 4 and the first insulating member 6 respectively.

[0089] End cap 3 refers to a component that covers the opening 2A of the housing 2 to isolate the internal environment of the battery cell 1 from the external environment. The shape of end cap 3 can be adapted to the shape of housing 2 to fit the housing 2. Optionally, end cap 3 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that end cap 3 is not easily deformed when subjected to compression and impact, so that battery cell 1 can have higher structural strength.

[0090] Optionally, such as Figure 4 As shown, the end cap 3 may be equipped with an explosion-proof valve 11, which is used to release the internal pressure and temperature of the battery cell 1. This application does not limit the number or type of explosion-proof valve 11.

[0091] The housing 2 is a component used to cooperate with the end cap 3 to form the internal environment of the battery cell 1, wherein the formed internal environment can be used to accommodate the electrode assembly 5, electrolyte (not shown in the figure), and other components. The housing 2 and the end cap 3 can be independent components, and an opening 2A can be provided on the housing 2. The end cap 3 closes the opening 2A to form the internal environment of the battery cell 1.

[0092] Alternatively, the end cap 3 and the housing 2 can be integrated. Specifically, the end cap 3 and the housing 2 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 2, the end cap 3 is then placed onto the housing 2. The housing 2 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc.

[0093] Specifically, the shape of the housing 2 can be determined according to the specific shape and size of the electrode assembly 5. The material of the housing 2 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special restrictions on it.

[0094] Understandably, the shape of the housing 2 can be determined according to the specific shape of the electrode assembly 5. For example, if the electrode assembly 5 is a cylindrical structure, then a cylindrical housing 2 can be selected; if the electrode assembly 5 is a cuboid structure, then a cuboid housing 2 can be selected.

[0095] Optionally, the housing 2 may have one opening 2A or two openings 2A. It is understood that if the housing 2 has one opening 2A, then there may be one end cap 3; if the housing 2 has two openings 2A, then there may be two end caps 3. The two end caps 3 respectively cover the two openings 2A.

[0096] Electrode terminal 4 can be used to electrically connect to electrode assembly 5 in order to output electrical energy from battery cell 1 or input electrical energy into battery cell 1.

[0097] For example, electrode terminal 4 is electrically connected to electrode tab, or electrode terminal 4 can be directly connected to the first electrode tab.

[0098] As another example, electrode terminal 4 and electrode tab can be electrically connected via adapter 12.

[0099] Optionally, the electrode terminal 4 can be made of one metal material or multiple metal materials, including but not limited to copper, aluminum, nickel, zinc, and iron. Alternatively, the electrode terminal 4 can be a single-piece molded component or composed of multiple separately molded parts connected together.

[0100] Optionally, the first insulating component 6 can be disposed on the outer periphery of the electrode terminal 4 using an overmolding injection molding process. The injection molding process is simple to operate and provides a good sealing effect after injection molding.

[0101] Alternatively, a pre-formed first insulating member 6 can be used to be disposed on the outer periphery of the electrode terminal 4 by nesting or bonding. The shape of the first insulating member 6 can be matched with the electrode terminal 4, which is beneficial for the first insulating member 6 to surround the outer periphery of the electrode terminal 4.

[0102] For example, such as Figure 3 , Figure 4As shown, the electrode terminal 4 is fitted with a first insulating member 6 on the side of the end cap 3 away from the electrode assembly 5.

[0103] The first insulating element 6 is disposed on the outer periphery of the electrode terminal 4, which can isolate the electrode terminal 4 from the end cap 3, improve the insulation between the electrode terminal 4 and the end cap 3, and prevent short circuits. In addition, the first insulating element 6 disposed on the outer periphery of the electrode terminal 4 also serves to fasten and protect the electrode terminal 4, and at the same time, the first insulating element 6 also serves to seal the electrode terminal 4 to prevent leakage.

[0104] In the embodiments of this application, a heat-absorbing element 7 is provided between the electrode terminal 4 and the first insulating member 6 along a first direction (X) perpendicular to the thickness direction (Z) of the end cap 3. The heat-absorbing element 7 can absorb the heat of the electrode terminal 4 and the first insulating member 6, and the heat-absorbing element 7 is respectively attached to the electrode terminal 4 and the first insulating member 6.

[0105] For example, such as Figure 4 , Figure 6 , Figure 7 As shown, the heat absorber 7 can be arranged around the electrode terminal 4.

[0106] For example, such as Figure 6 , Figure 7 , Figure 10 As shown, the heat-absorbing element 7 can be supported by the first insulating element 6, and the heat-absorbing element 7 is in contact with the first insulating element 6, which is beneficial to improving the heat absorption effect and heat absorption efficiency.

[0107] Since the heat-absorbing element 7 is attached to the electrode terminal 4 and the first insulating element 6, the heat-absorbing element 7 can directly exchange heat with the electrode terminal 4 and the first insulating element 6, absorbing the heat from both.

[0108] Optionally, the heat-absorbing element 7 can be made of a heat-absorbing agent, which can undergo a chemical reaction under heating to absorb a large amount of heat, thereby absorbing heat from the first insulating element 6 and the electrode terminal 4 through the heat-absorbing reaction. The heat-absorbing element 7 can be composed of a mixture of various heat-absorbing agents.

[0109] Alternatively, the heat absorber 7 can be made of a phase change material, which undergoes a change in physical state when the ambient temperature changes. Heat is stored during the phase change process, thereby absorbing heat from the first insulating member 6 and the electrode terminal 4. The heat absorber 7 can be composed of a single phase change material or a mixture of multiple phase change materials.

[0110] Optionally, the phase change material can be a solid-solid phase change material or a solid-liquid phase change material. The choice of phase change material is not limited to this, and will not be listed in the embodiments of this application.

[0111] Alternatively, the phase change material can be an inorganic phase change material, such as molten salt, hydrated salt, and metals and their compounds. The choice of phase change material is not limited to this, and will not be listed in the embodiments of this application.

[0112] Alternatively, the phase change material can be an organic phase change material, such as paraffin, alkanes, fatty acids and alcohol polymers. The choice of phase change material is not limited to this, and will not be listed in the embodiments of this application.

[0113] Alternatively, the phase change material can be a eutectic mixture of the above-mentioned organic and organic phase change materials, a eutectic mixture of the above-mentioned inorganic and inorganic phase change materials, or a eutectic mixture of the above-mentioned organic and inorganic phase change materials. The selection of phase change materials is not limited to these, and will not be listed in the embodiments of this application.

[0114] In addition, one or more of the following high thermal conductivity materials can be added to the phase change material: graphite, carbon fiber, foamed metal, nano-alumina, nano-sized metal particles, nano-sized metal oxide particles, and metal scrap, thereby increasing the thermal conductivity of the phase change material.

[0115] Because a heat-absorbing element 7 is provided between the electrode terminal 4 and the first insulating member 6, and the heat-absorbing element 7 is in contact with both the electrode terminal 4 and the first insulating member 6, the heat-absorbing element 7 can absorb the heat between the electrode terminal 4 and the first insulating member 6 during heat processing (such as welding), thereby reducing the risk of the first insulating member 6 overheating and cracking to a certain extent and improving the reliability of the battery cell 1. It is understood that welding includes processing the electrode terminal 4 using methods such as laser welding, friction welding, and arc welding.

[0116] In the embodiments of this application, the heat-absorbing element 7 includes a phase change material block with a melting point temperature of 25 to 65°C.

[0117] For example, the melting point of the phase change material block can be 25°C, 30°C, 35°C, 40°C, 45°C, 50°C, 55°C, 60°C, or 65°C. Other melting point temperatures are not listed.

[0118] Therefore, the heat-absorbing component 7 includes a phase change material block. The phase change material can change its phase state during heating and cooling to store heat. When welding the electrode terminal 4, the phase change material block can absorb a large amount of latent heat with almost no temperature change, further reducing the risk of the first insulating component 6 heating up and cracking.

[0119] In the embodiments of this application, the phase change material block is a paraffin-carbon fiber composite material block or a paraffin-aluminum foam material block.

[0120] Therefore, paraffin phase change materials have a wide phase change temperature range, as well as high latent heat of phase change and good chemical stability, which can improve the reliability of battery cell 1. Composite thermally conductive materials can increase the thermal conductivity of phase change materials and further enhance the heat absorption capacity of phase change material blocks.

[0121] In the embodiments of this application, when viewed along the thickness direction (Z) of the end cap 3, the first insulating member 6 is formed in a ring shape and is sleeved on the outer edge of the electrode terminal 4; along the first direction (X), the width of the heat-absorbing member 7 is not less than one-quarter of the difference between the outer edge of the first insulating member 6 and the outer edge of the electrode terminal 4, and the width of the heat-absorbing member 7 is not greater than half of the difference between the outer edge of the first insulating member 6 and the outer edge of the electrode terminal 4.

[0122] Optionally, when viewed along the thickness direction (Z) of the end cap 3, the first insulating element 6 can be a circular ring, an elliptical ring, or the like.

[0123] Optionally, when viewed along the first direction (X), the shape of the heat-absorbing element 7 can be circular, elliptical, triangular, quadrilateral or other polygonal.

[0124] For example, such as Figure 7 As shown, when viewed along the first direction (X), the shape of the heat-absorbing element 7 can be a triangle, with any two sides of the triangle in contact with the electrode terminal 4 and the first insulating element 6. In this embodiment, the type of triangle is not limited; it can be an acute triangle, a right triangle, or an obtuse triangle.

[0125] For example, such as Figure 6 As shown, when viewed along the first direction (X), the heat absorber 7 can be quadrilateral, with any two sides of the quadrilateral in contact with the electrode terminal 4 and the first insulating member 6. The shape of the heat absorber 7 is not limited to the rectangle shown in the figure, but can also be a trapezoid or other parallelogram.

[0126] For example, such as Figure 6 As shown, along the first direction (X), the width of the heat-absorbing element 7 is D1, and the difference between the outer edge of the first insulating element 6 and the outer edge of the electrode terminal 4 is D2. D1 is not less than one-quarter of D2 and not more than half of D2.

[0127] Since the width of the heat-absorbing component 7 is within a suitable range, it can balance the heat absorption effect with the structural strength of the first insulating component 6, thereby reducing the impact on the structural strength of the end cap 3.

[0128] In the embodiments of this application, when viewed along the thickness direction (Z) of the end cap 3, the inner edge of the first insulating member 6 is shaped along the outer edge of the electrode terminal 4; along the circumference of the first insulating member 6, the distance between the inner edge and the outer edge of the first insulating member 6 is the same.

[0129] For example, when viewed along the thickness direction (Z) of the end cap 3, the outer edge of the first insulating member 6 may be circular, and the outer edge of the electrode assembly may be the same circular shape.

[0130] As another example, when viewed along the thickness direction (Z) of the end cap 3, the outer edge of the first insulating member 6 may be elliptical, and the outer edge of the electrode assembly may be the same elliptical shape.

[0131] Therefore, the shape of the first insulating member 6 can be adapted to the outer edge shape of the electrode terminal 4, reducing the processing difficulty of the first insulating member 6 and improving assembly efficiency.

[0132] In the embodiments of this application, a positioning member 8 is provided between the first insulating member 6 and the end cover 3 along the thickness direction (Z). The positioning member 8 is arranged around the outer periphery of the heat-absorbing member 7, and the first insulating member 6 and the positioning member 8 are engaged and connected.

[0133] For example, the positioning member 8 is a component that can perform a fixing function. In this application, the positioning member 8 is a component used to fix the electrode terminal 4 to the end cover 3.

[0134] For example, the positioning element 8 is specifically a welding ring, which is welded to the end cap 3 by welding. It should be understood that the welding ring is a metal part, the end cap 3 is also a metal part, and the electrode terminal 4 is also a metal part. When the electrode terminal 4 is connected to the welding ring and / or the end cap 3, a short circuit will occur. Therefore, the positioning element 8, which is a welding ring, is spaced and fitted on the outside of the electrode terminal 4, and the first insulating element 6 is filled into the gap between the positioning element 8 and the electrode terminal 4 by injection molding or other means, thereby achieving insulation of the electrode terminal 4.

[0135] For example, the positioning element 8 can be formed by stamping. The shape of the positioning element 8 only needs to surround the electrode terminal 4, and there is no need to impose specific restrictions on the shape of the positioning element 8. The material of the positioning element 8 can be metals such as copper, iron, aluminum, stainless steel, and aluminum alloy. Optionally, the material of the positioning element 8 can be the same as that of the end cap 3 to reduce costs and enhance industrial applicability.

[0136] In a specific embodiment, the positioning member 8 is arranged around the electrode terminal 4, and the side of the positioning member 8 facing away from the end cover 3 is covered by the first insulating member 6. The positioning member 8 serves to support the first insulating member 6.

[0137] For example, the positioning member 8 is fitted around the outer periphery of the electrode terminal 4, and the first insulating member 6 is used to achieve insulation between the positioning member 8 and the electrode terminal 4. When the electrode terminal 4 is assembled, the positioning member 8 is connected and fixed to the end cover 3.

[0138] The positioning element 8 facilitates the connection and fixation between the electrode terminal 4 and the end cap 3. At the same time, the structure formed by the positioning element 8 and the first insulating element 6 can improve the overall strength of the first insulating element 6, avoid deformation of the first insulating element 6 due to compression or other reasons, and further improve the reliability of the battery cell 1.

[0139] It should be noted that the first insulating member 6 not only fills the space between the positioning member 8 and the electrode terminal 4, but also wraps the outer surface of the positioning member 8. The first insulating member 6 is not wrapped only at the connection structure position where the positioning member 8 is connected to the end cover 3, so as to prevent the external structure from having an adverse effect on the positioning member 8.

[0140] In the embodiments of this application, the first insulating member 6 is engaged with the positioning member 8.

[0141] Optionally, one of the first insulating member 6 and the positioning member 8 is provided with a locking groove 8A, and the other is provided with a protrusion 6A. The locking connection is achieved by assembling the locking groove 8A and the protrusion 6A.

[0142] Optionally, a locking groove 8A is formed on the inner side of the first insulating member 6, and a protrusion 6A corresponding to the locking groove 8A is provided on the outer periphery of the positioning member 8, so that the locking connection is achieved through assembly.

[0143] Alternatively, a locking groove 8A is provided on the outer periphery of the positioning member 8, and a protrusion 6A corresponding to the locking groove 8A is provided on the inner side of the first insulating member 6, so that the locking connection can be achieved through assembly.

[0144] Since the positioning element 8 is arranged around the outer periphery of the heat absorber 7, and the first insulating element 6 is engaged with the positioning element 8, the engaging connection structure is simple, easy to install and disassemble, and has high connection strength and good stability. Thus, the structure formed by the positioning element 8 and the first insulating element 6 can be used to improve the overall strength of the first insulating element 6 and the end cover 3, avoid the deformation of the first insulating element 6 due to compression or other reasons, and improve the reliability of the battery cell 1.

[0145] In a specific embodiment, the positioning member 8 is provided with a locking groove 8A, the first insulating member 6 is provided with a protrusion 6A that cooperates with the locking groove 8A, and the heat-absorbing member 7 is provided with a relief portion 7A that avoids the protrusion 6A.

[0146] Optionally, the clearance portion 7A can be a clearance hole or a clearance groove.

[0147] For example, such as Figure 4 , Figure 8 As shown, the positioning member 8 has a locking groove 8A on its outer periphery, the first insulating member 6 has a protrusion 6A corresponding to the locking groove 8A on its inner side, and the heat absorbing member 7 has a relief part 7A at the position corresponding to the protrusion 6A to avoid the protrusion 6A. The locking connection is achieved through assembly.

[0148] For example, the clearance portion 7A can be a blind hole.

[0149] Optionally, one or more clearance portions 7A may be provided along the circumference of the heat-absorbing member 7. When multiple clearance portions 7A are provided, the spacing between the clearance portions 7A may be the same or different.

[0150] For example, four clearance portions 7A are uniformly arranged along the circumference of the heat-absorbing member 7.

[0151] Therefore, the engagement groove 8A and the protrusion 6A can achieve rapid positioning and improve assembly efficiency. In addition, the shape of the heat-absorbing part 7 can match the engagement structure formed by the positioning part 8 and the first insulating part 6, which further facilitates assembly.

[0152] In the embodiments of this application, such as Figure 9 As shown, the electrode terminal 4 includes a terminal plate 4A and an electrode post 4B connected to the terminal plate 4A. The heat absorption element 7 is arranged around the terminal plate 4A, and the electrode post 4B is configured to be electrically connected to the electrode assembly 5.

[0153] Optionally, the terminal block 4A and the pole post 4B can be a single-piece molded structure or an assembled structure.

[0154] Optionally, the electrode post 4B can be directly electrically connected to the electrode assembly 5, or it can be electrically connected to the electrode assembly 5 through an electrical connector.

[0155] For example, the electrode terminal 4 is provided with a terminal plate 4A to facilitate electrical connection with an external conductive component such as a busbar, which increases the current-carrying area of ​​the electrode terminal 4, thereby increasing the current-carrying capacity of the battery cell 1.

[0156] Along the first direction (X), the width of the heat-absorbing element 7 is D1, and the difference between the distance between the outer edge of the first insulating element 6 (in this embodiment, the outer edge of the pole post 4B) and the outer edge of the electrode terminal 4 is D2. D1 is not less than one-quarter of D2 and not more than half of D2.

[0157] In the embodiments of this application, a sealing element 9 is also provided between the electrode terminal 4 and the end cover 3 along the thickness direction (Z) of the end cover 3.

[0158] For example, seal 9 is a sealing ring.

[0159] In specific embodiments, such as Figure 5 , Figure 6As shown, the sealing element 9 is arranged around the electrode terminal 4. The sealing element 9 seals the gap between the electrode terminal 4 and the end cover 3, preventing electrolyte or gas from seeping out and corroding the insulating parts, or corroding the electrode terminal 4 and causing a short circuit in the battery, thereby achieving internal and external isolation of the battery cell 1. At the same time, the sealing element 9 also insulates the electrode terminal 4 and the end cover 3, improving the reliability of the battery cell 1.

[0160] Alternatively, the seal 9 can be made of rubber, which has corrosion resistance, insulation, and high-temperature resistance properties. This reduces the adverse effects of welding heat on the seal 9.

[0161] Optionally, the number of seals 9 can be one or more.

[0162] Therefore, when the electrode terminal 4 is installed on the battery cell 1, the seal 9 can seal the gap between the electrode terminal 4 and the end cover 3, reduce the risk of air leakage or liquid leakage of the battery cell 1 through the gap of the end cover 3, and improve the reliability of the battery cell 1.

[0163] In this embodiment, the battery cell 1 further includes a second insulating member 10, which is disposed on the side of the end cover 3 near the electrode assembly 5. The second insulating member 10 is configured to insulate and isolate the end cover 3 from the electrode assembly 5.

[0164] Understandably, the second insulating component 10, as an insulating part, is used to provide insulation protection for the end cap 3, so as to reduce the probability of short circuit between the end cap 3 and the adapter 12 or the electrode assembly 5.

[0165] Alternatively, the material of the second insulating element 10 can be various, such as rubber, plastic or silicone.

[0166] Optionally, the first insulating element 6 and the second insulating element 10 may be made of the same material or different materials.

[0167] For example, the second insulating element 10 may be a lower plastic.

[0168] It is understood that in some embodiments, the second insulating member 10 may have through holes to allow the electrode terminal 4 or the electrode assembly 5 to pass through, and this application does not limit this.

[0169] Since the second insulating member 10 can be disposed on the side of the end cover 3 near the electrode assembly 5, the second insulating member 10 can insulate and isolate the end cover 3 from the electrode assembly 5, improve the insulation effect between the electrode assembly 5 and the end cover 3, and improve the reliability of the battery cell 1.

[0170] The second aspect of this application provides a battery device 100, including a plurality of battery cells 1 provided in the first aspect of this application.

[0171] In specific embodiments, such as Figure 2 As shown, multiple battery cells 1 can be placed in the housing 101. The housing 101 includes a cover 102 and a base plate 103 that can be fastened together. The cover 102 and the base plate 103 are fastened together, so that the interior of the housing 101 forms a closed space to accommodate the battery cells 1.

[0172] Since the battery device 100 includes the battery cell 1 disclosed in the first aspect of the present application, it can reduce the risk of the first insulating component 6 heating up and cracking during the assembly of the battery cell 1 to a certain extent, which is beneficial to improving the assembly efficiency and reliability of the battery device 100.

[0173] A third aspect of the present application provides an energy storage device 2000, including a plurality of battery cells 1 provided in the first aspect of the present application or a plurality of battery devices 100 provided in the second aspect of the present application, wherein the battery cells 1 or the battery devices 100 are used to store or provide electrical energy.

[0174] Since the energy storage device 2000 includes the battery cell 1 disclosed in the first aspect of the present application or the battery device 100 provided in the second aspect of the present application, it can reduce the risk of the first insulating component 6 heating up and cracking during the assembly of the battery cell 1 to a certain extent, which is beneficial to improving the assembly efficiency and reliability of the energy storage device 2000.

[0175] A fourth aspect of the present application provides an electrical device, including a battery cell 1 provided in the first aspect of the present application, a battery device 100 provided in the second aspect of the present application, or an energy storage device 2000 provided in the third aspect of the present application, wherein the battery cell 1 or the battery device 100 is used to store or provide electrical energy.

[0176] For example, such as Figure 1 As shown, the electrical device can be a vehicle 1000, and a battery device 100 is installed inside the vehicle 1000. The battery device 100 can be used to power the vehicle 1000.

[0177] Vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Vehicle 1000 has a battery device 100 installed inside. The battery device 100 can provide power to vehicle 1000.

[0178] Therefore, to a certain extent, the risk of the first insulating component 6 cracking due to temperature rise during the assembly of battery cell 1 can be reduced, which is conducive to improving the assembly efficiency and reliability of electrical devices.

[0179] A specific embodiment of this application will now be described with reference to the accompanying drawings.

[0180] By embedding a heat-absorbing element 7 in the inner layer of the first insulating element 6, which is directly attached to the electrode terminal 4, the heat-absorbing element 7 absorbs the temperature when the electrode terminal 4 heats up rapidly, thereby improving the phenomenon of cracking of the first insulating element 6 when it heats up rapidly.

[0181] In this embodiment, the heat absorber 7 can be a phase change material block. The phase change temperature of the heat absorber 7 is 25°C to 65°C; the main material of the heat absorber 7 is not limited to paraffin-carbon fiber composite material, paraffin-aluminum foam, etc.

[0182] The heat-absorbing element 7 has a ring structure and is located between the electrode terminal 4 and the first insulating element 6;

[0183] The inner diameter of the heat absorber 7 is the same as the diameter of the electrode terminal 4. The width of the heat absorber 7 is D1. The difference between the outer edge of the first insulating member 6 and the outer edge of the electrode terminal 4 is D2. D1 is not less than one-quarter of D2 and not more than half of D2.

[0184] In this embodiment, the heat-absorbing component 7 is provided with four clearance holes corresponding to the protrusions 6A of the first insulating component 6, which can fix the heat-absorbing component 7 and the electrode terminal 4 and prevent relative slippage during assembly.

[0185] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0186] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0187] 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 they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, The battery cell includes a housing and an electrode assembly housed within the housing. The housing has an opening, and an end cap closes the opening. The end cap is provided with electrode terminals, which are electrically connected to the electrode assembly. A first insulating element is sleeved on the side of the end cap away from the electrode assembly. Along a first direction perpendicular to the thickness direction of the end cap, a heat-absorbing element is disposed between the electrode terminal and the first insulating element, and the heat-absorbing element is respectively attached to the electrode terminal and the first insulating element.

2. The battery cell according to claim 1, characterized in that, The heat-absorbing element includes a phase change material block, the phase change material block having a melting point temperature of 25 to 65°C.

3. The battery cell according to claim 2, characterized in that, The phase change material block is a paraffin-carbon fiber composite material block or a paraffin-aluminum foam material block.

4. The battery cell according to claim 1, characterized in that, Viewed along the thickness direction of the end cap, the first insulating element is formed in a ring shape and is sleeved on the outer edge of the electrode terminal; Along the first direction, the width of the heat-absorbing element is not less than one-quarter of the difference between the outer edge of the first insulating element and the outer edge of the electrode terminal, and the width of the heat-absorbing element is not greater than half of the difference between the outer edge of the first insulating element and the outer edge of the electrode terminal.

5. The battery cell according to claim 2, characterized in that, Viewed along the thickness direction of the end cap, the first insulating element is formed in a ring shape and is sleeved on the outer edge of the electrode terminal; Along the first direction, the width of the heat-absorbing element is not less than one-quarter of the difference between the outer edge of the first insulating element and the outer edge of the electrode terminal, and the width of the heat-absorbing element is not greater than half of the difference between the outer edge of the first insulating element and the outer edge of the electrode terminal.

6. The battery cell according to claim 4, characterized in that, Viewed along the thickness direction of the end cap, the inner edge of the first insulating member is shaped along the outer edge of the electrode terminal; Along the circumference of the first insulating member, the distance between the inner edge and the outer edge of the first insulating member is the same.

7. The battery cell according to claim 1, characterized in that, Along the thickness direction of the end cap, a positioning member is provided between the first insulating member and the end cap. The positioning member is arranged around the outer periphery of the heat-absorbing member, and the first insulating member is engaged with the positioning member.

8. The battery cell according to claim 2, characterized in that, Along the thickness direction of the end cap, a positioning member is provided between the first insulating member and the end cap. The positioning member is arranged around the outer periphery of the heat-absorbing member, and the first insulating member is engaged with the positioning member.

9. The battery cell according to claim 7, characterized in that, The positioning member is provided with a locking groove, the first insulating member is provided with a protrusion that cooperates with the locking groove, and the heat-absorbing member is provided with a relief portion that avoids the protrusion.

10. The battery cell according to claim 1, characterized in that, The electrode terminal includes a terminal plate and an electrode post connected to the terminal plate. The heat-absorbing element is arranged around the terminal plate, and the electrode post is configured to be electrically connected to the electrode assembly.

11. The battery cell according to any one of claims 1 to 10, characterized in that, Along the thickness direction of the end cap, a sealing element is also provided between the electrode terminal and the end cap.

12. The battery cell according to any one of claims 1 to 10, characterized in that, The battery cell also includes a second insulating member disposed on the side of the end cap near the electrode assembly, the second insulating member being configured to insulate the end cap from the electrode assembly.

13. A battery device, characterized in that, It includes a plurality of battery cells according to any one of claims 1 to 12.

14. An energy storage device, characterized in that, It includes a battery cell as described in any one of claims 1 to 12 or a battery device as described in any one of claims 13, wherein the battery cell or the battery device is used to store or provide electrical energy.

15. An electrical appliance, characterized in that, Includes a battery cell according to any one of claims 1 to 12, a battery device according to claim 13, or an energy storage device according to claim 14, wherein the battery cell or the battery device is used to store or provide electrical energy.

Images