A battery cell, a battery device, and an electric device

Abstract

The application provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a connector, an electrode terminal and a first heat conductor. The electrode terminal is electrically connected with the connector and is fixed. The first heat conductor is in contact with the connector and the electrode terminal. In the application, the first heat conductor is arranged between the electrode terminal and the connector, an additional heat conduction path is formed between the electrode terminal and the connector, the heat dissipation performance is improved, the temperature of the position where the electrode terminal is electrically connected with the connector is reduced, the overcurrent capacity of the current between the electrode terminal and the connector is improved, the original outer contour size and the connection process between the electrode terminal and the connector are maintained, the manufacturing process is changed, and the production cost is reduced.

Description

Technical Field

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

[0002] In recent years, with the continuous improvement of the charge and discharge rates of battery devices, the requirements for heat dissipation inside battery devices have also become increasingly stringent.

[0003] During the charging and discharging process of a battery device, the individual battery cells are the primary heat source. Within each battery cell, connectors electrically connect the electrode assembly and the electrode terminals to create a conductive path between them.

[0004] Because the contact area between the adapter and the electrode terminals is limited, the contact area between the two is prone to overheating and limits the current carrying capacity, thus limiting the charging and discharging capacity of the battery cells. Utility Model Content

[0005] In view of this, embodiments of this application aim to provide a battery cell, battery device, and power device that are beneficial for improving heat dissipation.

[0006] To achieve this objective, the technical solution of this application embodiment is implemented as follows:

[0007] This application provides a battery cell, which includes:

[0008] Adapter;

[0009] The electrode terminals are electrically connected to and fixed to the adapter.

[0010] The first heat conductor is in contact with the adapter and the electrode terminal, respectively.

[0011] In the battery cell of this application embodiment, by arranging a first heat-conducting body in contact between the electrode terminal and the adapter, an additional heat conduction path is formed between the electrode terminal and the adapter. This is beneficial for improving heat dissipation performance, reducing the temperature at the electrical connection point between the electrode terminal and the adapter during the operation of the battery cell, improving the current carrying capacity between the electrode terminal and the adapter, maintaining the original outer contour dimensions and connection process between the electrode terminal and the adapter, reducing changes to the manufacturing process, and reducing production costs.

[0012] In some embodiments, the electrode terminals and the adapter are welded to form a first welding area, and the first heat conductor is in contact with the first welding area. This allows the heat generated in the first welding area when electrically conductive to be transferred to the electrode terminals through the additional heat conduction path formed by the first heat conductor, which helps to reduce the temperature of the first welding area and thus improves the current carrying capacity of the first welding area.

[0013] In some embodiments, a portion of the adapter and the electrode terminal are spaced apart to form a separation gap. At least a portion of the first heat conductor is filled in the separation gap. The adapter has a through-hole, one end of which communicates with the separation gap, and the other end communicates with the space on the side of the adapter opposite to the electrode terminal. The through-hole is used to fill the separation gap with the first heat conductor from the side of the adapter opposite to the electrode terminal. This helps to reduce the adverse effects of high temperatures generated by welding or other processes between the adapter and the electrode terminal on the first heat conductor. Furthermore, filling the space on the side of the adapter opposite to the electrode terminal through the through-hole reduces interference between the electrode terminal and the adapter during the filling process.

[0014] In some embodiments, the adapter includes a first connecting portion, a second connecting portion, and an adapter portion. The second connecting portion is spaced apart from the electrode terminal, and the spacing direction between them is a first direction. The first connecting portion and the second connecting portion are located on the same side of the electrode terminal along the first direction, and the first connecting portion is fixed to the electrode terminal along the first direction. The adapter portion connects the first connecting portion and the second connecting portion. The connection position of the adapter portion and the first connecting portion is closer to the electrode terminal along the first direction than the connection position of the adapter portion and the second connecting portion. The adapter portion, the second connecting portion, and the electrode terminal form the separation gap, and the through hole penetrates the adapter portion. Thus, the adapter portion, the second connecting portion, and the electrode terminal together limit the first heat conductor. The through hole is located in the adapter portion, which helps to reduce the movement of the first heat conductor in the separation gap to other areas within the battery cell under the action of gravity.

[0015] In some embodiments, the current cross-sectional area of ​​the portion of the adapter forming the through hole is smaller than the current cross-sectional area of ​​other portions of the adapter. Thus, since the connection position between the adapter and the first connecting portion is closer to the electrode terminal in the first direction than the connection position between the adapter and the second connecting portion, it is difficult for the molten portion to re-overlap and reconnect electrically after the adapter melts, thereby reducing the probability that the adapter can conduct current again after melting.

[0016] In some embodiments, the battery cell further includes an electrode assembly and a second heat conductor. The electrode assembly is electrically connected to and fixed to the adapter, and the second heat conductor is disposed between the adapter and the electrode assembly and contacts both. This improves the heat dissipation performance of the battery cell through the second heat conductor, reduces the temperature at the electrical connection point between the electrode assembly and the adapter during battery cell operation, and enhances the current carrying capacity between the electrode assembly and the adapter.

[0017] In some embodiments, the electrode assembly and the adapter are welded to form a second welding area, and the second heat conductor is in contact with the second welding area. This allows the heat generated in the second welding area when electrically conductive to be transferred to the adapter through the additional heat conduction path formed by the second heat conductor, improving heat dissipation and reducing the temperature of the second welding area, thereby increasing the current carrying capacity of the second welding area.

[0018] In some embodiments, the battery cell further includes an electrode assembly, a housing, and a third heat conductor. The electrode assembly is electrically connected to and fixed to the adapter. The housing has a receiving cavity, within which the electrode assembly, the adapter, the first heat conductor, and the third heat conductor are all located. Both the electrode assembly and the housing are in contact with the third heat conductor. Thus, the third heat conductor forms a heat conduction path from the electrode assembly to the housing, allowing the heat generated by the electrode assembly to be directly conducted to the housing and released to the outside of the battery cell, which helps to reduce the temperature of the electrode assembly.

[0019] In some embodiments, the electrode assembly is a wound structure, and at least a portion of the third heat conductor is located on one side of the electrode assembly along its axial direction. In this way, the third heat conductor can conduct heat from both sides of the electrode assembly along the axial direction to the housing, thereby improving the heat dissipation effect of the electrode assembly.

[0020] Alternatively, the electrode assembly may be a stacked structure, with at least a portion of the third heat conductor located on a side of the electrode assembly perpendicular to its stacking direction. In this way, the third heat conductor can conduct heat from the surface of the electrode assembly perpendicular to its stacking direction to the outer casing, thereby improving the heat dissipation effect of the electrode assembly.

[0021] In some embodiments, the battery cell further includes an insulating film located within the receiving cavity, the insulating film forming a receiving space, at least a portion of the electrode assembly located within the receiving space, and at least a portion of the third heat conductor located between and in contact with the inner wall of the receiving cavity and the insulating film. In this way, the heat generated by the electrode assembly can be conducted sequentially through the insulating film and the third heat conductor to the outer casing, thereby improving the heat dissipation effect on the electrode assembly.

[0022] In some embodiments, the insulating film includes a first wall with a through-hole that communicates with the receiving space. The third heat conductor contacts the outer casing and connects to the electrode assembly through the first heat conductor. This facilitates the direct formation of a heat conduction path from the electrode assembly through the third heat conductor to the outer casing, improving heat dissipation for the electrode assembly.

[0023] In some embodiments, the battery cell further includes a separator located between the inner wall of the receiving cavity and the first wall. The separator has a through-hole for second filling, and the third heat conductor contacts the electrode assembly through the first and second filling holes. This facilitates the direct formation of a heat conduction path from the electrode assembly through the third heat conductor to the outer casing, improving the heat dissipation effect on the electrode assembly.

[0024] In some embodiments, in a projection plane perpendicular to the direction opposite to the partition and the first wall, the projection of the first filling hole is outside the projection range of the second filling hole. At least a portion of the partition and the first wall are spaced apart along a first direction to form a filling gap, the filling gap connecting the first filling hole and the second filling hole. The third heat conductor contacts the electrode assembly and the housing respectively through the first filling hole, the filling gap, and the second filling hole. Thus, the first filling hole and the second filling hole are staggered, which helps reduce the risk of foreign objects passing through the first and second filling holes and contacting the electrode assembly, causing a short circuit.

[0025] This application also provides a battery device, which includes a housing and any of the battery cells described in the foregoing embodiments. The housing has a receiving space, and the battery cells are located within the receiving space.

[0026] Thus, by using the battery cells in the aforementioned embodiments, it is beneficial to improve the charge and discharge rates of the battery device by enhancing the heat dissipation performance of the battery cells.

[0027] This application also provides an electrical device, which includes the battery device in the foregoing embodiments, and the battery device is used as the power source for the electrical device.

[0028] Thus, by using the battery device in the aforementioned embodiments, it is beneficial to reduce the charging time of the power-consuming device and improve the user experience. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of an embodiment of the present application where the electrical device is a vehicle;

[0030] Figure 2This is a schematic diagram of a battery device in one embodiment of this application;

[0031] Figure 3 This is a schematic diagram of a single battery cell in the first embodiment of this application;

[0032] Figure 4 for Figure 3 An exploded view of an embodiment;

[0033] Figure 5 for Figure 3 A schematic diagram of an embodiment from another perspective;

[0034] Figure 6 for Figure 5 A cross-sectional diagram of position AA in the middle;

[0035] Figure 7 for Figure 6 A magnified view of a portion of position B in the diagram;

[0036] Figure 8 This is a schematic diagram of an adapter in one embodiment of this application;

[0037] Figure 9 for Figure 8 A magnified view of a portion of position D in the middle;

[0038] Figure 10 for Figure 8 A schematic diagram of an embodiment from another perspective;

[0039] Figure 11 for Figure 10 A schematic diagram of the location of the EE in the middle;

[0040] Figure 12 for Figure 11 A magnified view of a portion of position F in the middle;

[0041] Figure 13 for Figure 6 A magnified view of the area at position C in the middle;

[0042] Figure 14 This is a schematic diagram of the insulating film and the separator in one embodiment of this application.

[0043] Explanation of reference numerals in the attached figures

[0044] 1000, Vehicle; 100, Battery Unit; 200, Controller; 300, Motor; 10, Housing; 11, First Housing; 12, Second Housing; 20, Battery Cell; 21, Adapter; 21a, First Welding Area; 21b, Separation Gap; 21c, Through Hole; 21d, Second Welding Area; 211, First Connecting Part; 212, Second Connecting Part; 213, Adapter; 22, Electrode Terminal; 23, First Heat Conductor; 24, Electrode Assembly; 25, Second Heat Conductor; 26, Housing; 26a, Receiving Cavity; 27, Third Heat Conductor; 28, Insulating Film; 28a, Receiving Space; 281, First Wall; 281a, First Filling Hole; 29, Separator; 29a, Second Filling Hole; 29b, Filling Gap. Detailed Implementation

[0045] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed descriptions in the specific embodiments should be understood as explanations of the purpose of this application and should not be regarded as undue limitations on this application.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms “comprising” and “having”, and any variations thereof, in the specification and drawings of this application are intended to cover non-exclusive inclusion.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] In the description of the embodiments of this application, for ease of explanation, as shown in the accompanying drawings, the direction of arrow X is referred to as the "first direction".

[0051] 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. For those skilled in the art, the specific meaning of the terms in the embodiments of this application can be understood according to the specific circumstances.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0056] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0057] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0058] In some implementations, the electrode assembly is a stacked structure.

[0059] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0060] 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.

[0061] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0062] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0063] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0064] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0065] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0066] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0067] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0068] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0069] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0070] In some embodiments, a pressure relief mechanism is provided on the casing. The pressure relief mechanism is used to release the internal gas of the battery cell.

[0071] As an example, the internal pressure or temperature of a battery cell is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is broken, thereby creating an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell.

[0072] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0073] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0074] The term "actuation" as used in this application refers to the activation or actuation of the pressure relief mechanism to a certain state, thereby releasing the internal pressure and temperature of the battery cell. The actions of the pressure relief mechanism may include, but are not limited to: movement of components within the mechanism to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the mechanism, etc. When the pressure relief mechanism is activated, the high-temperature, high-pressure substances inside the battery cell are discharged as waste from the activated portion. This method allows for pressure and temperature relief of the battery cell under controllable pressure or temperature, thereby preventing potentially more serious accidents.

[0075] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be configured as a through hole for venting gas inside the battery cell.

[0076] The emissions from battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

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

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

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

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

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

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

[0083] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0084] As an example, see Figure 2 The housing 10 may include a first housing 11 and a second housing 12. The first housing 11 and the second housing 12 are fastened together to form a closed space inside the housing 10 to house the battery cell assembly. Here, "closed" refers to covering or closing, which can be sealed or unsealed. The first housing 11 may be a top cover or a bottom plate.

[0085] 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.

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

[0087] In 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.

[0088] 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 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.

[0089] 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.

[0090] The embodiments of this application will now be described in detail.

[0091] A single battery cell includes an adapter and electrode terminals, which are electrically connected to each other so that current can be conducted between them.

[0092] To maintain the stability of the electrical connection between the adapter and the electrode terminals, the adapter and electrode terminals are fixed by welding. Due to factors such as structural layout and welding process limitations, the area formed by welding the adapter and electrode terminals is relatively small. This results in poor current carrying capacity as current flows through this area, and it also easily leads to excessive heat generation in this area when electrically conductive, causing the temperature to rise and further deteriorating the current carrying capacity of this area. Consequently, the charge and discharge capacity of the battery cells is lower than expected.

[0093] In related technologies, if the heat generation in the area formed by welding the adapter and the electrode terminal is reduced by increasing the size of the adapter, it will have an adverse effect on the volumetric energy density of the battery cell and increase the difficulty of welding. If the heat generation is reduced by increasing the area of ​​the area formed by welding the adapter and the electrode terminal, it will place higher demands on factors such as welding manufacturing cost, welding process difficulty, required equipment and tooling fixtures.

[0094] Based on the above-mentioned problems and the drawbacks of the solutions in related technologies, the present application aims to provide a battery cell, a battery device, and an electrical device, wherein a first heat conductor is provided between the adapter and the electrode terminal of the battery cell. The first heat conductor can form an additional heat conduction path between the adapter and the electrode terminal, thereby enhancing the heat conduction capability between the adapter and the electrode terminal. This is beneficial for the heat generated in the electrically conductive state to be directly conducted to the electrode terminal for heat dissipation, and for reducing the temperature of the connection area between the adapter and the electrode terminal.

[0095] Specifically, see Figures 3 to 7 This application provides a battery cell 20, which includes an adapter 21, an electrode terminal 22, and a first heat conductor 23.

[0096] Electrode terminal 22 is electrically connected to and fixed to adapter 21.

[0097] The first heat conductor 23 is in contact with both the adapter 21 and the electrode terminal 22. That is, the first heat conductor 23 is in contact with both the adapter 21 and the electrode terminal 22, so that a heat conduction path is formed between the adapter 21, the first heat conductor 23 and the electrode terminal 22.

[0098] Electrode terminals 22 are used for discharging or charging battery cells 20. Electrode terminals 22 are electrically connected to the busbar in the battery device 100, and are electrically connected to the electrode terminals 22 of different battery cells 20 through the busbar, so as to realize the series or parallel connection between different battery cells 20.

[0099] Electrode terminal 22 can be either negative or positive.

[0100] The electrode terminal 22 is electrically connected to the adapter 21 so that current can be conducted between them.

[0101] The specific fixing method between the electrode terminal 22 and the adapter 21 is not limited, such as welding.

[0102] It is understandable that the area where the electrode terminal 22 is directly in contact with and fixed to the adapter 21 is also the area where the electrical connection between the two is achieved.

[0103] It is understood that the electrode terminal 22 and the adapter 21 are fixed together so that they are in contact with each other, thereby forming a heat conduction path between them. This allows the heat generated by the current to be conducted to the electrode terminal 22, and then dissipated to the outside of the battery cell 20 through the electrode terminal 22.

[0104] The first heat conductor 23 creates an additional indirect heat conduction path between the electrode terminal 22 and the adapter 21, in addition to the original direct contact path. This allows heat to be transferred not only directly from the adapter 21 to the electrode terminal 22, but also from the adapter 21 through the first heat conductor 23 to the electrode terminal 22.

[0105] In this embodiment of the application, the battery cell 20 forms an additional heat conduction path between the electrode terminal 22 and the adapter 21 by arranging a first heat conductor 23 in contact between the electrode terminal 22 and the adapter 21. This is beneficial for improving heat dissipation performance, reducing the temperature at the electrical connection point between the electrode terminal 22 and the adapter 21 during the operation of the battery cell 20, improving the current carrying capacity between the electrode terminal 22 and the adapter 21, maintaining the original outer contour dimensions and connection process between the electrode terminal 22 and the adapter 21, reducing changes to the manufacturing process, and reducing production costs.

[0106] Understandably, the first heat conductor 23 is insulating to reduce the risk of short circuits in the electrode terminals 22 and the adapter 21 caused by foreign objects in the battery cell 20 coming into contact with the first heat conductor 23.

[0107] In some embodiments, the thermal conductivity of the structure of the first heat conductor 23 is greater than that of the structure of the adapter 21. This is beneficial for the first heat conductor 23 to transfer heat to the electrode terminal 22 more quickly, thereby improving heat dissipation performance.

[0108] The material of the first heat conductor 23 can be ceramic, silicone, epoxy resin, etc.

[0109] In some embodiments, see Figure 7 The electrode terminal 22 and the adapter 21 are welded to form a first welding area 21a. The first heat conductor 23 is in contact with the first welding area 21a so that a heat conduction path is formed between the first welding area 21a and the first heat conductor 23.

[0110] It is understood that the first welding area 21a is the contact area between the adapter 21 and the electrode terminal 22, which is fixed by welding. Current is conducted between the adapter 21 and the electrode terminal 22 through the first welding area 21a.

[0111] In this way, the heat generated in the first welding area 21a when it is electrically conductive can be transferred to the electrode terminal 22 through the additional heat conduction path formed by the first heat conductor 23, which helps to reduce the temperature of the first welding area 21a and thus improve the current carrying capacity of the first welding area 21a.

[0112] The specific welding process for forming the first welding area 21a is not limited, such as laser welding.

[0113] In some embodiments, see Figure 7The first heat conductor 23 surrounds the first welding area 21a on the periphery of the first welding area 21a in a direction perpendicular to the relative direction of the adapter 21 and the electrode terminal 22. This helps to increase the contact area between the first heat conductor 23 and the first welding area 21a and improve the heat dissipation effect on the first welding area 21a.

[0114] It is understandable that during the welding process of the adapter 21 and the electrode terminal 22, the two need to be brought together to form a first bonding area along the relative direction of the adapter 21 and the electrode terminal 22, and then welding is performed on the first bonding area to form a first welding area 21a. Due to process limitations, the range of the first welding area 21a is smaller than the range of the bonding area. Therefore, after the welding operation is completed, the part of the first bonding area that has not formed the first welding area 21a may separate to form a gap.

[0115] In some embodiments, the first heat conductor 23 is a solid structure so that it can be directly installed in a preset position during the assembly of the battery cell 20, thereby improving assembly efficiency.

[0116] In some embodiments, see Figure 7 A portion of the adapter 21 and the electrode terminal 22 are spaced apart along a first direction to form a separation gap 21b, and at least a portion of the first heat conductor 23 is filled in the separation gap 21b.

[0117] In one embodiment, the first heat conductor 23 is a fluid medium with fluidity, allowing the first heat conductor 23 to enter the gap between the adapter 21 and the electrode terminal 22.

[0118] Thus, by utilizing the fluidity of the first heat conductor 23, it is beneficial for the first heat conductor to fill the narrow gap between the adapter 21 and the electrode terminal 22, thereby increasing the contact area between the first heat conductor 23 and the adapter 21 and the electrode terminal 22 respectively, and improving heat dissipation performance. In some embodiments where a first welding area 21a is provided, see [reference needed]. Figure 7 The first welding area 21a forms part of the inner wall of the partition gap 21b, so that the first heat conductor 23 in the partition gap 21b can contact the first welding area 21a.

[0119] The specific form of the first heat conductor 23 as a fluid medium is not limited. For example, the first heat conductor 23 can be thermal grease, ceramic filler thermal paste, metal filler thermal paste, composite material thermal paste, phase change thermal paste, etc.

[0120] In some embodiments, see Figure 7 , Figure 8 , Figure 9 and Figure 12The adapter 21 is provided with a through hole 21c. One end of the through hole 21c is open and communicates with the separation gap 21b, and the other end is open and communicates with the space on the side of the adapter 21 away from the electrode terminal 22. The through hole 21c is used to fill the first heat conductor 23 from the side of the adapter 21 away from the electrode terminal 22 into the separation gap 21b.

[0121] After the adapter 21 and the electrode terminal 22 are fixed together by welding or other means, the first heat conductor 23 is filled into the separation gap 21b through the through hole 21c from the side of the adapter 21 away from the electrode terminal 22.

[0122] This helps to reduce the adverse effects of high temperatures and other factors generated by welding and other processes between the adapter 21 and the electrode terminal 22 on the first heat conductor 23. The filling operation of the first heat conductor 23 through the through hole 21c from the space on the side of the adapter 21 away from the electrode terminal 22 helps to reduce the interference of the electrode terminal 22 and the adapter 21 on the filling operation of the first heat conductor 23.

[0123] The specific number of the separation gaps 21b is not limited; it can be one or more.

[0124] In some embodiments, see Figure 7 The number of through holes 21c is multiple, so that the first heat conductor 23 can be filled into different areas of the partition gap 21b simultaneously through each through hole 21c, thereby improving efficiency.

[0125] In some embodiments, see Figure 7 , Figure 8 and Figure 10 The adapter 21 includes a first connecting part 211, a second connecting part 212, and an adapter 213. The first connecting part 211 is fixed to the electrode terminal 22. The second connecting part 212 is spaced apart from the electrode terminal 22, and the spacing between them is in the first direction. The first connecting part 211 and the second connecting part 212 are located on the same side of the electrode terminal 22 along the first direction, and the first connecting part 211 is fixed to the electrode terminal 22 along the first direction. The adapter 213 connects the first connecting part 211 and the second connecting part 212. The connection position of the adapter 213 and the first connecting part 211 is closer to the electrode terminal 22 along the first direction than the connection position of the adapter 213 and the second connecting part 212. A separation gap 21b is formed between the adapter 213, the second connecting part 212, and the electrode terminal 22. A through hole 21c penetrates the adapter 213.

[0126] Thus, the adapter 213, the second connection 212, and the electrode terminal 22 together limit the first heat conductor 23; the through hole 21c is located in the adapter 213, which helps to reduce the flow of the first heat conductor 23 in the separation gap 21b through the through hole 21c to other areas in the battery cell 20 under the action of gravity.

[0127] In some embodiments, the first connecting portion 211 is arranged offset from the first connecting portion 212 along a first direction, meaning that the side surface of the first connecting portion 211 facing away from the electrode terminal 22 is closer to the electrode terminal 22 than the side surface of the second connecting portion 212 facing away from the electrode terminal 22.

[0128] It is understood that a first welding area 21a is formed between the first connecting portion 211 and the electrode terminal 22.

[0129] In some embodiments, see Figure 4 and Figure 6 The battery cell 20 also includes an electrode assembly 24. An adapter 21 is located between the electrode assembly 24 and the electrode terminal 22. The adapter 21 is electrically connected to and fixed to the electrode assembly 24. The electrode assembly 24 undergoes an electrochemical reaction with the electrolyte in the battery cell 20.

[0130] In some embodiments, see Figure 7 The electrode assembly 24 and the electrode terminal 22 are spaced apart along the first direction, and the second connecting part 212 is fixed to and electrically connected to the electrode assembly 24.

[0131] Understandably, if the current flowing through the adapter 21 exceeds its overcurrent capacity, the adapter 21 can melt and the current can no longer flow through it.

[0132] In some embodiments, the electrode assembly 24 includes tabs that are fixed to and electrically connected to the adapter 21.

[0133] In some embodiments, the current cross-sectional area of ​​the portion of the adapter 213 that forms the through hole 21c is smaller than the current cross-sectional area of ​​other portions of the adapter 213, so that the structure of the adapter 213 surrounding the through hole 21c can be melted when the adapter 21 is in an overcurrent state.

[0134] The current cross-sectional area refers to the cross-sectional area in the direction perpendicular to the connection position between the adapter 213 and the first connection 211 and the connection position between the adapter 213 and the second connection 212.

[0135] In other words, when the current passing through the adapter 21 exceeds the current-carrying capacity of the adapter 21, the portion of the adapter 213 that forms the through hole 21c will preferentially melt.

[0136] Thus, since the connection position between the adapter 213 and the first connection 211 is closer to the electrode terminal 22 in the first direction than the connection position between the adapter 213 and the second connection 212, it is difficult for the melted part of the adapter 213 to be re-connected after melting, thereby reducing the probability that the adapter 21 can conduct current again after melting.

[0137] In some embodiments, see Figure 7 and Figure 11 The first connecting portion 211 and the second connecting portion 212 are spaced apart along the first direction. This helps to further reduce the probability that the melted part of the transition portion 213 will re-lap after melting.

[0138] In some embodiments, see Figure 7 and Figure 11 In a projection plane perpendicular to the first direction, the projection of the first connecting portion 211 is outside the projection range of the second connecting portion 212. This helps to further reduce the probability of the melted part of the transition portion 213 re-attaching after it melts.

[0139] The specific method for achieving a fixed connection between the adapter 21 and the electrode assembly 24 is not limited, such as ultrasonic welding.

[0140] Understandably, due to factors such as structural layout and welding process limitations, the area formed by welding the adapter 21 and the electrode assembly 24 is relatively small. This results in poor current carrying capacity as the current flows through this area, and it also easily leads to more heat generation in this area when it is electrically conductive, causing the temperature to rise and further deteriorating the current carrying capacity of this area. Consequently, the charging and discharging capacity of the battery cell 20 is not as expected.

[0141] In some embodiments where the electrode assembly 24 is provided, see [reference]. Figure 7 The battery cell 20 also includes a second heat conductor 25, which is disposed between the adapter 21 and the electrode assembly 24 and contacts both of them, so that a heat conduction path is formed between the adapter 21, the second heat conductor 25 and the electrode assembly 24.

[0142] The second heat conductor 25 creates an additional indirect heat conduction path between the electrode assembly 24 and the adapter 21, in addition to the original direct contact path. This allows heat to be conducted from the electrode assembly 24 through the second heat conductor 25 to the adapter 21.

[0143] This is beneficial for improving the heat dissipation performance of the battery cell 20 through the second heat conductor 25, reducing the temperature at the electrical connection point between the electrode assembly 24 and the adapter 21 during the operation of the battery cell 20, and improving the current carrying capacity between the electrode assembly 24 and the adapter 21.

[0144] Understandably, the second heat conductor 25 is insulating to reduce the risk of short circuits in the electrode assembly 24 and the adapter 21 caused by foreign objects in the battery cell 20 coming into contact with the second heat conductor 25.

[0145] In some embodiments, the thermal conductivity of the structure of the second heat conductor 25 is greater than that of the structure of the electrode assembly 24. This is beneficial for the second heat conductor 25 to transfer heat to the adapter 21 more quickly, thereby improving the heat dissipation performance of the electrode assembly 24.

[0146] The material of the second heat conductor 25 can be ceramic, silicone, epoxy resin, etc.

[0147] In some embodiments, the material of the structure of the second heat conductor 25 is the same as that of the structure of the first heat conductor 23, in order to simplify the manufacturing process of the battery cell 20.

[0148] In some embodiments, see Figure 7 The electrode assembly 24 and the adapter 21 are welded to form a second welding area 21d, and the second heat conductor 25 comes into contact with the second welding area 21d to form a heat conduction path.

[0149] It is understandable that the second welding area 21d is the contact area between the adapter 21 and the electrode assembly 24, which is fixed by welding. Current is conducted between the adapter 21 and the electrode assembly 24 through the second welding area 21d.

[0150] In this way, the heat generated in the second welding area 21d when it is electrically conductive can be transferred to the adapter 21 through the additional heat conduction path formed by the second heat conductor 25, which improves the heat dissipation effect and helps to reduce the temperature of the second welding area 21d, thereby improving the current carrying capacity of the second welding area 21d.

[0151] The specific welding process for forming the second welding area 21d is not limited, such as ultrasonic welding.

[0152] In some embodiments, the second heat conductor 25 is a solid structure so that it can be directly installed in a preset position during the assembly of the battery cell 20, thereby improving assembly efficiency.

[0153] It is understandable that during the welding process of the adapter 21 and the electrode assembly 24, the two need to be brought together in the relative direction of the adapter 21 and the electrode assembly 24 to form a second bonding area. Then, welding is performed on the second bonding area to form a second welding area 21d. Due to process limitations, the range of the second welding area 21d is smaller than the range of the bonding area. Therefore, after the welding operation is completed, the part of the second bonding area that has not formed the second welding area 21d may separate to form a gap.

[0154] In some embodiments, the second heat conductor 25 is a fluid medium, such that the second heat conductor 25 fills the gap between the electrode assembly 24 and the adapter 21.

[0155] Thus, the fluidity of the second heat conductor 25 facilitates its filling of the narrow gap between the electrode assembly 24 and the adapter 21, increasing the heat dissipation area and further improving the heat dissipation effect.

[0156] The specific form of the fluid medium for the second heat conductor 25 is not limited. For example, the first heat conductor 23 can be thermal grease, ceramic filler thermal paste, metal filler thermal paste, composite material thermal paste, phase change thermal paste, etc.

[0157] It is understandable that the battery pack will also release heat during the charging and discharging process of individual battery cells.

[0158] In some embodiments where the electrode assembly 24 is provided, see [reference]. Figure 3 , Figure 6 and Figure 13 The battery cell 20 also includes a housing 26 and a third heat conductor 27. The housing 26 is provided with a receiving cavity 26a. The electrode assembly 24, the adapter 21, the first heat conductor 23 and the third heat conductor 27 are all located in the receiving cavity 26a. The electrode assembly 24 and the housing 26 are in contact with the third heat conductor 27.

[0159] The housing 26 provides mounting positions for the electrode assembly 24, the adapter 21, the first heat conductor 23 and the third heat conductor 27, and also provides a certain degree of protection.

[0160] Thus, through the third heat conductor 27, a heat conduction path can be formed from the electrode assembly 24 to the outer casing 26, thereby directly conducting the heat generated by the electrode assembly 24 to the outer casing 26 and releasing it to the outside of the battery cell 20, which is beneficial to reducing the temperature of the electrode assembly 24.

[0161] See Figure 3 and Figure 5 Electrode terminals 22 are located on the housing 26.

[0162] Understandably, the third heat conductor 27 is insulating to reduce the risk of short circuits in the electrode assembly 24 and the adapter 21 caused by foreign objects in the battery cell 20 coming into contact with the third heat conductor 27.

[0163] In some embodiments, the thermal conductivity of the third heat conductor 27 is greater than that of the electrode assembly 24. This allows the third heat conductor 27 to transfer heat to the housing 26 more quickly, thereby improving the heat dissipation performance of the electrode assembly 24.

[0164] The material of the third heat conductor 27 can be ceramic, silicone, epoxy resin, etc.

[0165] In some embodiments, see Figure 4 The electrode assembly 24 has a wound structure, and at least a portion of the third heat conductor 27 is located on one side of the electrode assembly 24 along its axial direction.

[0166] The electrode assembly 24 has a wound structure, meaning that the electrode sheets in the electrode assembly 24 are wound around a preset axis. The direction of the preset axis is the axial direction of the electrode assembly 24.

[0167] It is understandable that in the wound structure, the electrode assembly 24 has a multi-layer structure in the direction perpendicular to the axial direction of the electrode assembly 24. Since the multi-layer structure blocks each other, the heat generated inside the electrode assembly 24 is difficult to conduct to the surface of the electrode assembly 24 in the direction perpendicular to its axial direction, but is mainly conducted to the two sides of the electrode assembly 24 along the axial direction along the battery assembly.

[0168] In this way, the third heat conductor 27 can conduct the heat from both sides of the electrode assembly 24 along the axial direction to the outer casing 26, thereby improving the heat dissipation effect of the electrode assembly 24.

[0169] In some embodiments, the axial direction of the electrode assembly 24 is a first direction.

[0170] In some embodiments, the electrode assembly 24 is a stacked structure, and at least a portion of the third heat conductor 27 is located on one side of the electrode assembly 24 perpendicular to its stacking direction.

[0171] The electrode assembly 24 is a stacked structure, which means that the electrode assembly 24 includes multiple electrodes, and the electrodes are stacked together along the thickness direction of the electrodes to form a multi-layer structure.

[0172] It is understandable that in a stacked structure, due to the mutual obstruction between the multiple layers, the heat generated inside the electrode assembly 24 is difficult to conduct to the surface of the electrode assembly 24 along its stacking direction, but is mainly conducted to the surface of the electrode assembly 24 along the direction perpendicular to the stacking direction of the battery assembly.

[0173] In this way, the third heat conductor 27 can conduct the heat from the surface of the electrode assembly 24 perpendicular to its stacking direction to the outer casing 26, thereby improving the heat dissipation effect of the electrode assembly 24.

[0174] It is understandable that the third heat conductor 27 can be in direct contact with the inner wall of the cavity 26a to form a heat conduction path; or a heat conduction path can be formed through other components within the battery cell 20.

[0175] In some embodiments, see Figure 4 and Figure 13 The battery cell 20 also includes an insulating film 28, which is located within the receiving cavity 26a and forms a receiving space 28a. At least a portion of the electrode assembly 24 is located within the receiving space 28a.

[0176] The insulating film 28 is insulating and can separate the electrode assembly 24 from the housing 26 to reduce the risk of short circuit between the electrode assembly 24 and the housing 26 due to contact.

[0177] In some embodiments, referring to the figures, at least a portion of the third heat conductor 27 is located between the inner wall of the receiving cavity 26a and the insulating film 28, forming a heat conduction path between them.

[0178] In other words, a heat conduction path is formed between the electrode assembly 24, the insulating film 28, the third heat conductor 27, and the outer shell 26.

[0179] In this way, the heat generated by the electrode assembly 24 can be conducted to the outer casing 26 through the insulating film 28 and the third heat conductor 27 in sequence, so as to improve the heat dissipation effect of the electrode assembly 24.

[0180] In some embodiments, see Figure 13 and Figure 14 The insulating film 28 includes a first wall 281, the first wall 281 is provided with a through first filling hole 281a, the first filling hole 281a communicates with the receiving space 28a, the third heat conductor 27 contacts the outer shell 26, and the third heat conductor 27 contacts the electrode assembly 24 through the first filling hole 281a.

[0181] In other words, a portion of the third heat conductor 27 passes through the first filling hole 281a to enter the receiving space 28a and contacts the electrode assembly 24 in the receiving space 28a to form a heat conduction path.

[0182] This facilitates the direct formation of a heat conduction path from the electrode assembly 24 through the third heat conductor 27 to the outer casing 26, thereby improving the heat dissipation effect on the electrode assembly 24.

[0183] The specific number of the first filling hole 281a is not limited; it can be one or more.

[0184] In some embodiments, see Figure 4 , Figure 13 and Figure 14 The battery cell 20 also includes a separator 29, which is located between the inner wall of the receiving cavity 26a and the insulating film 28. The separator 29 can separate and support the insulating film 28 from the shell.

[0185] In some embodiments, see Figure 13 The partition 29 is located between the inner wall of the receiving cavity 26a and the first wall 281. The partition 29 is provided with a through second filling hole 29a. The third heat conductor 27 contacts the electrode assembly 24 through the first filling hole 281a and the second filling hole 29a.

[0186] That is, a portion of the third heat conductor 27 passes through the first filling hole 281a and the second filling hole 29a to enter the receiving space 28a and contacts the electrode assembly 24 in the receiving space 28a to form a heat conduction path.

[0187] This facilitates the direct formation of a heat conduction path from the electrode assembly 24 through the third heat conductor 27 to the outer casing 26, thereby improving the heat dissipation effect on the electrode assembly 24.

[0188] In some embodiments, the third heat conductor 27 is a solid structure so that it can be directly installed in a preset position during the assembly of the battery cell 20, thereby improving assembly efficiency.

[0189] In some embodiments, see Figure 13 In the projection plane perpendicular to the relative direction of the partition 29 and the first wall 281, the projection of the first filling hole 281a is outside the projection range of the second filling hole 29a. At least a portion of the partition 29 is spaced relative to the first wall 281 along the first direction to form a filling gap 29b. The filling gap 29b connects the first filling hole 281a and the second filling hole 29a. The third heat conductor 27 contacts the electrode assembly 24 and the outer shell 26 through the first filling hole 281a, the filling gap 29b and the second filling hole 29a, respectively.

[0190] Thus, the first filling hole 281a and the second filling hole 29a are staggered, which helps to reduce the risk of foreign objects passing through the first filling hole 281a and the second filling hole 29a and coming into contact with the electrode assembly 24, causing a short circuit.

[0191] In some embodiments, the third heat conductor 27 is a fluid medium. Utilizing the fluidity of the third heat conductor 27, it can flow under the action of external force, thereby passing through the first filling hole 281a, the filling gap 29b and the second filling hole 29a in sequence to contact the electrode assembly 24, which helps to simplify the manufacturing process of the third heat conductor 27.

[0192] During the assembly of the battery cell 20, a third heat conductor 27, which is a fluid medium, can be coated on the inner wall of the receiving cavity 26a. Then, the separator 29, the insulating film 28, and the electrode assembly 24 are installed into the receiving cavity 26a. The separator 29 compresses the third heat conductor 27, so that the third heat conductor 27 flows in the space between the separator 29 and the inner wall of the receiving cavity 26a and flows into the first filling hole 281a. It continues to flow under the compression and enters the receiving space 28a in sequence through the first filling hole 281a, the filling gap 29b, and the second filling hole 29a to contact the electrode assembly 24.

[0193] The specific form of the third heat conductor 27 is not limited. For example, the first heat conductor 23 can be thermal grease, ceramic filler thermal paste, metal filler thermal paste, composite material thermal paste, phase change thermal paste, etc.

[0194] In some embodiments, the relative direction between the partition 29 and the first wall 281 is the first direction.

[0195] The battery cell 20 in a specific embodiment of this application is described as follows:

[0196] The battery cell 20 includes an adapter 21, electrode terminals 22, a housing 26, a separator 29, a first heat conductor 23, a second heat conductor 25, and a third heat conductor 27. The electrode terminals 22 are electrically connected to and fixed to the adapter 21, and the first heat conductor 23 contacts both the adapter 21 and the electrode terminals 22. The electrode terminals 22 and the adapter 21 are welded to form a first welding area 21a, and the first heat conductor 23 contacts the first welding area 21a. A portion of the adapter 21 is spaced apart from the electrode terminals 22 to form a separation gap 21b. At least a portion of the first heat conductor 23 fills the separation gap 21b. The adapter 21 has a through hole 21c, one end of which communicates with the separation gap 21b, and the other end communicates with the space on the side of the adapter 21 away from the electrode terminals 22. The through hole 21c is used to fill the separation gap 21b from the side of the adapter 21 away from the electrode terminals 22 with the first heat conductor 23. The adapter 21 includes a first connecting portion 211, a second connecting portion 212, and an adapter portion 213. The first connecting portion 211 is fixed to the electrode terminal 22. The second connecting portion 212 is spaced apart from the electrode terminal 22, and the spacing between them is in a first direction. The first connecting portion 211 and the second connecting portion 212 are located on the same side of the electrode terminal 22 along the first direction, and the first connecting portion 211 is fixed to the electrode terminal 22 along the first direction. The adapter portion 213 connects the first connecting portion 211 and the second connecting portion 212. The connection position of the adapter portion 213 with the first connecting portion 211 is closer to the electrode terminal 22 along the first direction than the connection position of the adapter portion 213 with the second connecting portion 212. A separation gap 21b is formed between the adapter portion 213, the second connecting portion 212, and the electrode terminal 22. A through hole 21c penetrates the adapter portion 213. The current cross-sectional area of ​​the portion of the adapter portion 213 forming the through hole 21c is smaller than the current cross-sectional area of ​​the other portions of the adapter portion 213. Electrode assembly 24 is electrically connected to and fixed to adapter 21. A second heat conductor 25 is disposed between adapter 21 and electrode assembly 24 and contacts both, forming a heat conduction path between adapter 21, the second heat conductor 25, and electrode assembly 24. Electrode assembly 24 and adapter 21 are welded to form a second welding area 21d, and the second heat conductor 25 contacts the second welding area 21d. Electrode assembly 24 is electrically connected to and fixed to adapter 21. Housing 26 has a receiving cavity 26a, within which electrode assembly 24, adapter 21, first heat conductor 23, and third heat conductor 27 are all located. Electrode terminal 22 is disposed on housing 26. Electrode assembly 24 and housing 26 both form heat conduction paths with the third heat conductor 27.An insulating film 28 is located within a receiving cavity 26a, forming a receiving space 28a. At least a portion of the electrode assembly 24 is located within the receiving space 28a. The insulating film 28 includes a first wall 281, which has a through first filling hole 281a communicating with the receiving space 28a. A partition 29 is located between the inner wall of the receiving cavity 26a and the first wall 281, and has a through second filling hole 29a. In a projection plane perpendicular to the relative direction of the partition 29 and the first wall 281, the projection of the first filling hole 281a is outside the projection range of the second filling hole 29a. At least a portion of the partition 29 is spaced apart from the first wall 281 along a first direction to form a filling gap 29b, which communicates with the first filling hole 281a and the second filling hole 29a. A third heat conductor 27 contacts the electrode assembly 24 and the outer shell 26 via the first filling hole 281a, the filling gap 29b, and the second filling hole 29a, respectively.

[0197] This application embodiment also provides a battery device 100, which includes a housing 10 and any of the battery cells 20 in the foregoing embodiments. The housing 10 has a receiving space 28a, and the battery cells 20 are located in the receiving space 28a.

[0198] Thus, by using the battery cell 20 in the aforementioned embodiment, it is beneficial to improve the charge and discharge rate of the battery device 100 by improving the heat dissipation performance of the battery cell 20.

[0199] This application embodiment also provides an electrical device, which includes the battery device 100 in the foregoing embodiment, and the battery device 100 is used as the power source for the electrical device.

[0200] Thus, by using the battery device 100 in the aforementioned embodiments, it is beneficial to reduce the charging time of the power-consuming device and improve the user experience.

[0201] The various embodiments / implementations provided in this application can be combined with each other without creating contradictions.

[0202] The above are merely preferred embodiments of this application and are not intended to limit the embodiments in this application. For those skilled in the art, the embodiments of this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of the embodiments of this application.

Claims

1. A battery cell, characterized in that, The battery cell includes: Adapter; The electrode terminals are electrically connected to and fixed to the adapter. The first heat conductor is in contact with the adapter and the electrode terminal, respectively.

2. The battery cell according to claim 1, characterized in that, The electrode terminal and the adapter are welded together to form a first welding area, and the first heat conductor is in contact with the first welding area.

3. The battery cell according to claim 1, characterized in that, A portion of the adapter and the electrode terminal are spaced apart to form a separation gap. At least a portion of the first heat conductor is filled in the separation gap. The adapter is provided with a through hole. One end of the through hole is open and communicates with the separation gap, and the other end is open and communicates with the space on the side of the adapter away from the electrode terminal. The through hole is used to fill the first heat conductor from the side of the adapter away from the electrode terminal into the separation gap.

4. The battery cell according to claim 3, characterized in that, The adapter includes a first connecting portion, a second connecting portion, and an adapter portion. The second connecting portion is spaced apart from the electrode terminal, and the spacing direction between them is a first direction. The first connecting portion and the second connecting portion are located on the same side of the electrode terminal along the first direction, and the first connecting portion is fixed to the electrode terminal along the first direction. The adapter portion connects the first connecting portion and the second connecting portion. The connection position of the adapter portion and the first connecting portion is closer to the electrode terminal along the first direction than the connection position of the adapter portion and the second connecting portion. The adapter portion, the second connecting portion, and the electrode terminal form the separation gap. The through hole penetrates the adapter portion.

5. The battery cell according to claim 4, characterized in that, The current cross-sectional area of ​​the portion of the adapter that forms the through hole is smaller than the current cross-sectional area of ​​the other portions of the adapter.

6. The battery cell according to claim 1, characterized in that, The battery cell also includes an electrode assembly and a second heat conductor. The electrode assembly is electrically connected to and fixed to the adapter. The second heat conductor is disposed between the adapter and the electrode assembly and contacts both of them.

7. The battery cell according to claim 6, characterized in that, The electrode assembly and the adapter are welded to form a second welding area, and the second heat conductor is in contact with the second welding area.

8. The battery cell according to claim 1, characterized in that, The battery cell also includes an electrode assembly, a housing, and a third heat conductor. The electrode assembly is electrically connected to and fixed to the adapter. The housing has a receiving cavity. The electrode assembly, the adapter, the first heat conductor, and the third heat conductor are all located within the receiving cavity. The electrode assembly and the housing are both in contact with the third heat conductor.

9. The battery cell according to claim 8, characterized in that, The electrode assembly has a wound structure, and at least a portion of the third heat conductor is located on one side of the electrode assembly along its axial direction; Alternatively, the electrode assembly may be a stacked structure, with at least a portion of the third heat conductor located on one side of the electrode assembly perpendicular to its stacking direction.

10. The battery cell according to claim 8, characterized in that, The battery cell also includes an insulating film located within the receiving cavity, the insulating film forming a receiving space, at least a portion of the electrode assembly located within the receiving space, and at least a portion of the third heat conductor located between the inner wall of the receiving cavity and the insulating film and in contact with both.

11. The battery cell according to claim 10, characterized in that, The insulating film includes a first wall with a through-hole. The first filling hole communicates with the accommodating space. The third heat conductor is in contact with the outer shell and is in contact with the electrode assembly through the first filling hole.

12. The battery cell according to claim 11, characterized in that, The battery cell also includes a separator, which is located between the inner wall of the receiving cavity and the first wall. The separator has a through second filling hole, and the third heat conductor contacts the electrode assembly through the first filling hole and the second filling hole.

13. The battery cell according to claim 12, characterized in that, In a projection plane perpendicular to the direction opposite to the partition and the first wall, the projection of the first filling hole is outside the projection range of the second filling hole. At least a portion of the partition and the first wall are spaced apart relative to each other along a first direction to form a filling gap. The filling gap connects the first filling hole and the second filling hole. The third heat conductor contacts the electrode assembly and the housing respectively through the first filling hole, the filling gap and the second filling hole.

14. A battery device, characterized in that, The battery device includes a housing and a battery cell according to any one of claims 1 to 13, wherein the housing has a receiving space and the battery cell is located within the receiving space.

15. An electrical appliance, characterized in that, The electrical device includes the battery device of claim 14, the battery device being used as a power source for the electrical device.

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