Soft package battery monomer, battery device and power utilization device

Abstract

The embodiment of the utility model provides a soft package battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. The soft package battery cell comprises: a packaging film; the electrode assembly is accommodated in the packaging film; at least part of the heat conduction piece is inserted into the electrode assembly, and at least part of the heat conduction piece is located outside the electrode assembly and exchanges heat with the packaging film. Through the design of the heat conduction piece, the internal heat of the electrode assembly can be quickly transferred outwards, the cooling efficiency of the electrode assembly far away from the heat exchange interface is improved, the temperature gradient among all positions in the soft package battery monomer is reduced, the uniformity of the internal temperature of the soft package battery monomer is effectively improved, and the performance of the soft package battery monomer is optimized; and the service life of the soft package battery monomer is prolonged.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a soft-pack battery cell, a battery device, and an electric device. Background Art

[0002] In the related art, a large amount of heat is generated in the soft-pack battery cell during the fast charging process, which causes the internal temperature of the soft-pack battery cell to rise sharply. In addition, since the temperature is higher near the heat exchange plate and lower far from the heat exchange plate, the internal temperature of the soft-pack battery cell is extremely uneven, which seriously affects the performance and service life of the soft-pack battery cell. Utility Model Content

[0003] The present application provides a soft-pack battery cell, a battery device and an electrical device to reduce the temperature gradient between various positions inside the soft-pack battery cell and improve the uniformity of the temperature inside the soft-pack battery cell.

[0004] In a first aspect, an embodiment of the present application provides a soft-pack battery cell, comprising:

[0005] Packaging film;

[0006] An electrode assembly is contained in the packaging film;

[0007] A heat conductive member, at least a portion of which is inserted into the electrode assembly, and at least a portion of which is located outside the electrode assembly and exchanges heat with the packaging film.

[0008] In the above technical solution, through the design of the above-mentioned heat conductor, the internal heat of the electrode assembly can be quickly transferred outward, thereby increasing the cooling efficiency of the electrode assembly away from the heat exchange interface, and at the same time reducing the temperature gradient between various positions inside the soft-pack battery cell, effectively improving the uniformity of the internal temperature of the soft-pack battery cell, and helping to improve the efficiency and safety of the soft-pack battery cell during the charging and discharging process, thereby optimizing the performance of the soft-pack battery cell and extending the service life of the soft-pack battery cell.

[0009] In some embodiments, the heat conductive member includes a first heat conductive segment and an extension segment connected by a bend, the first heat conductive segment is inserted inside the electrode assembly, and at least a portion of the extension segment is attached to the outer wall surface of at least one side of the electrode assembly and to the packaging film.

[0010] In some embodiments, the heat conductive member is provided in plurality, and the first heat conductive segments of at least some of the heat conductive members are separated by some pole pieces of the electrode assembly.

[0011] In some embodiments, the extension section is disposed on a side of the electrode assembly where no electrode tab is disposed.

[0012] In some embodiments, the extension section includes a second heat-conducting section that is bent and connected to the first heat-conducting section, and the second heat-conducting section is attached to the outer wall surface of the electrode assembly and the inner wall surface of the packaging film.

[0013] In some embodiments, the extension section further includes a third heat-conducting section, the first heat-conducting section, the second heat-conducting section and the third heat-conducting section are bent and connected in sequence, and the first heat-conducting section and the third heat-conducting section are folded in the same direction relative to the second heat-conducting section, wherein:

[0014] The third heat-conducting section is inserted into the electrode assembly; or the third heat-conducting section is attached to the outer wall surface of the electrode assembly and the inner wall surface of the packaging film.

[0015] In some embodiments, the electrode assembly is of a wound type or a stacked type, and the extension section extends from a side of the electrode assembly opposite to the electrode tab.

[0016] In some embodiments, two heat conductive members are provided, and the two heat conductive members are distributed along the thickness direction of the packaging film. The first heat conductive sections of the two heat conductive members are inserted into the electrode assembly and fit each other, and the extension sections of the two heat conductive members are respectively fit to different areas of the bottom wall of the electrode assembly.

[0017] In some embodiments, the extension section of one of the heat conductive members is also attached to the first side wall of the electrode assembly, and the extension section of the other heat conductive member is also attached to the second side wall of the electrode assembly, wherein the first side wall and the second side wall are respectively located on opposite sides of the electrode assembly along the thickness direction of the packaging film.

[0018] In some embodiments, the electrode assembly is a laminate type, and the extension section extends from a side surface of the electrode assembly adjacent to the electrode tab.

[0019] In some embodiments, two heat conductive members are provided, and the two heat conductive members are spaced apart along the thickness direction of the packaging film, and the first heat conductive sections of the two heat conductive members are separately inserted inside the electrode assembly, wherein the extension section of one of the heat conductive members is attached to the third side wall of the electrode assembly, and the extension section of the other heat conductive member is attached to the fourth side wall of the electrode assembly, wherein the third side wall and the fourth side wall are respectively located on opposite sides of the electrode assembly along the length direction of the packaging film.

[0020] In some embodiments, the extension section suitable for bonding with the third side wall also bonds with the first side wall of the electrode assembly, and the extension section suitable for bonding with the fourth side wall also bonds with the second side wall of the electrode assembly, wherein the first side wall and the second side wall are respectively located on opposite sides of the electrode assembly along the thickness direction of the packaging film.

[0021] In a second aspect, an embodiment of the present application provides a battery device, including:

[0022] A plurality of soft-pack battery cells according to any of the above schemes;

[0023] A heat exchange plate, wherein the heat exchange plate is used to exchange heat with the soft-pack battery cell.

[0024] In a third aspect, an embodiment of the present application provides an electrical device, including:

[0025] As the battery device mentioned above, the battery device is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0028] Figure 2 An exploded view of the structure of a battery device provided in some embodiments of the present application;

[0029] Figure 3 A schematic diagram of the structure of a soft-pack battery cell and a heat transfer element provided in some embodiments of the present application;

[0030] Figure 4 One of the structural schematic diagrams of the electrode assembly and the heat conducting member provided in some embodiments of the present application;

[0031] Figure 5 The second schematic diagram of the structure of the electrode assembly and the heat conducting member provided in some embodiments of the present application;

[0032] Figure 6 One of the structural explosion diagrams of a soft-pack battery cell provided in some embodiments of the present application;

[0033] Figure 7 The second structural explosion diagram of a soft-pack battery cell provided in some embodiments of the present application;

[0034] Figure 8 One of the cross-sectional views of a soft-pack battery cell provided in some embodiments of the present application;

[0035] Fig. 9 This is a second cross-sectional view of a soft-pack battery cell provided in some embodiments of the present application.

[0036] Reference numerals:

[0037] Vehicles 1000;

[0038] Battery device 100;

[0039] Box body 10, first box body 11, second box body 12;

[0040] Soft pack battery cell 20;

[0041] Packaging film 21, aluminum-plastic film 211;

[0042] The electrode assembly 22 , a first side wall 221 , a second side wall 222 , a third side wall 223 , a fourth side wall 224 , and an electrode tab 225 ;

[0043] Heat conducting member 23, first heat conducting section 231, extension section 232, second heat conducting section 2321, third heat conducting section 2322;

[0044] Heat transfer element 30;

[0045] Controller 200; Motor 300. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0048] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0049] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0051] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0052] In the embodiment of the present application, the soft-pack battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating the active material by charging after the battery cell is discharged.

[0053] The soft-pack battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., which is not limited in the embodiments of the present application.

[0054] The soft-pack battery cell includes a packaging film, an electrode assembly and an electrolyte, and the packaging film is used to contain the electrode assembly and the electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The soft-pack battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode collector includes a positive electrode collector body and a positive electrode ear. The positive electrode active material layer is coated on the surface of the positive electrode collector body. The positive electrode ear is not coated with the positive electrode active material layer and protrudes from the positive electrode collector body. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode collector includes a negative electrode collector body and a negative electrode ear. The negative electrode active material layer is coated on the surface of the negative electrode collector body. The negative electrode ear is not coated with the negative electrode active material layer and protrudes from the negative electrode collector body. The negative electrode current collector may be made of copper, and the negative electrode active material may be carbon or silicon, etc. In order to ensure that a large current is passed without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0055] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a winding structure or a stacked structure, but the embodiments of the present application are not limited thereto.

[0056] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using soft-pack battery cells, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc. Battery cells are used to store or provide electrical energy.

[0057] The inventors found that the current prior art mainly cools or heats the soft-pack battery cells by increasing external heat exchange conditions. Since the temperature distribution and transfer of the electrode assembly inside the soft-pack battery cell are completely dependent on the inherent heat transfer characteristics of the electrode assembly itself, there is a strong heat exchange relationship between the electrode assembly near the heat exchange interface because the packaging film includes a metal material and has a high heat transfer rate. The physical properties of the electrode assembly's own material determine that the heat transfer rate inside the electrode assembly is low, which will cause a large temperature gradient between the temperature of the electrode assembly near the heat exchange interface and the temperature far from the heat exchange interface. For example, in the bottom cooling solution, the main heat source of the soft-pack battery cell is in the center of the internal electrode assembly and the upper part close to the pole, but the main cooling surface is at the bottom of the packaging film. Therefore, in the actual working process, there will be a large temperature gradient between the top and middle of the electrode assembly and the bottom of the electrode assembly, which may have a serious impact on the performance and service life of the soft-pack battery cell.

[0058] Based on the above considerations, in order to solve the problem that the temperature inside the soft-pack battery cell far from the heat exchange interface is too high, affecting the charge and discharge performance and safety of the soft-pack battery cell, the inventor has designed a soft-pack battery cell after in-depth research, including: a packaging film, an electrode assembly and a heat conductor. The electrode assembly is accommodated in the packaging film; at least part of the heat conductor is inserted into the electrode assembly, and at least part of the heat conductor is located outside the electrode assembly and exchanges heat with the packaging film.

[0059] In a soft-pack battery cell of this structure, by arranging the heat conductor to be at least partially inserted into the electrode assembly and at least partially located outside the electrode assembly and exchanging heat with the packaging film, this structure can quickly transfer the internal heat of the electrode assembly to the outside, increase the cooling efficiency of the electrode assembly away from the heat exchange interface, and reduce the temperature gradient between various positions inside the soft-pack battery cell, thereby effectively improving the uniformity of the internal temperature of the soft-pack battery cell, thereby optimizing the performance of the soft-pack battery cell and extending the service life of the soft-pack battery cell.

[0060] The battery device mentioned in the embodiments of the present application may include one or more soft-pack battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple soft-pack battery cells, which are connected in series, in parallel, or in mixed connection through a busbar component.

[0061] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of soft-pack battery cells.

[0062] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of soft-pack battery cells into an independent module. As an example, the battery module may be formed by bundling a plurality of soft-pack battery cells with a cable tie.

[0063] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0064] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0065] As an example, the battery cell assembly may also be housed in the box by directly fixing a plurality of soft-pack battery cells to the box.

[0066] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0067] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0068] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0069] The battery device involved in the embodiments of the present application can be used in an energy storage device, such as an energy storage container or an energy storage cabinet.

[0070] The embodiment of the present application provides an electric device using a soft-pack battery cell or a battery device as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, and a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0071] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0072] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle, and the battery device 100 may be provided at the bottom, head or tail of the vehicle. The battery device 100 may be used to power the vehicle, for example, the battery device 100 may be used as an operating power source for the vehicle. The vehicle may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and operating power requirements of the vehicle during driving.

[0073] In some embodiments of the present application, the battery device 100 can be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0074] Please refer to Figure 2 , Figure 2 The structural exploded diagram of the battery device 100 provided in some embodiments of the present application. The battery device 100 includes a box body 10 and a plurality of soft-pack battery cells 20, and the soft-pack battery cells 20 are used to be accommodated in the box body 10. Among them, the box body 10 is used to provide an assembly space for the soft-pack battery cells 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, and the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the soft-pack battery cells 20. The second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define an assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0075] In the battery device 100, multiple soft-pack battery cells 20 can be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple soft-pack battery cells 20 are connected in series and in parallel. Multiple soft-pack battery cells 20 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by multiple soft-pack battery cells 20 is accommodated in the box 10; of course, the battery device 100 can also be a battery module formed by multiple soft-pack battery cells 20 connected in series, in parallel, or in mixed connection, and multiple battery modules are then connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 10. The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component for realizing electrical connection between multiple soft-pack battery cells 20.

[0076] Please refer to Figure 2 The battery device 100 includes multiple rows of soft-pack battery cells 20, which are arranged along a first direction, and each row of soft-pack battery cells 20 includes multiple soft-pack battery cells 20 arranged along a second direction. The first direction and the second direction are respectively the length direction of the box body 10 and the width direction of the box body 10, and the first direction and the second direction are perpendicular to each other.

[0077] If there is no special instructions, Figure 3 , Figure 8 and Fig. 9 As shown, the length direction of the packaging film in the present application is the X direction in the figure, the thickness direction of the packaging film in the present application is the Y direction in the figure, and the height direction of the packaging film in the present application is the Z direction in the figure.

[0078] According to some embodiments of the present application, see Figure 6-Figure 9 As shown, the present application provides a soft-pack battery cell 20. The soft-pack battery cell 20 includes: a packaging film 21, an electrode assembly 22 and a heat conductor 23. The electrode assembly 22 is received in the packaging film 21; at least part of the heat conductor 23 is inserted into the electrode assembly 22, and at least part of the heat conductor 23 is located outside the electrode assembly 22 and exchanges heat with the packaging film 21.

[0079] The packaging film 21 is used to wrap and package the electrode assembly 22. The packaging film 21 can protect the internal electrode assembly 22 from being affected by the external environment as little as possible, and can also serve as an important medium for heat exchange between the heat exchange plate and the internal electrode assembly 22.

[0080] In this embodiment, reference Figure 6 , and further refer to Figure 7 The packaging film 21 can be formed by hot-pressing and packaging two pieces of aluminum-plastic films 211.

[0081] In other embodiments, the packaging film 21 may also be formed by folding a whole piece of aluminum-plastic film 211 and then hot-pressing and packaging it.

[0082] The electrode assembly 22 is composed of a positive electrode sheet, a negative electrode sheet and a separator. As the core part of the soft-pack battery cell 20, the electrode assembly 22 is responsible for the storage and release of electric energy.

[0083] The heat conductor 23 is used to efficiently conduct the internal center heat of the electrode assembly 22 to the packaging film 21 , and then conduct it to the heat exchange plate through the packaging film 21 .

[0084] The heat conducting member 23 may be made of a material with high thermal conductivity, such as graphite, graphene, aluminum or copper, etc., which is not limited here.

[0085] Understandably, see Figure 6-Figure 9As shown, the heat conductor 23 is at least partially inserted into the electrode assembly 22, directly contacts the pole piece and the diaphragm, and effectively collects the heat generated inside the electrode assembly 22; at the same time, at least another part of the heat conductor 23 extends to the outside of the electrode assembly 22, and directly or indirectly contacts the packaging film 21 to achieve heat transfer to the outside. The design of the heat conductor 23 enables the heat generated inside the electrode assembly 22 to be quickly transferred to the outside through the heat conductor 23, and heat exchange is carried out with the heat exchange plate through the packaging film 21, which significantly improves the heat conduction efficiency. At the same time, through the effective intervention of the heat conductor 23, the temperature gradient between different positions inside the soft-pack battery cell 20 is reduced, making the overall temperature distribution of the soft-pack battery cell 20 more uniform, which helps to improve the performance stability and cycle life of the soft-pack battery cell 20. In addition, the improvement of temperature uniformity reduces the performance degradation and safety hazards caused by local overheating, making the soft-pack battery cell 20 more efficient and safer during the charging and discharging process. In addition, efficient thermal management also reduces material aging caused by thermal stress and extends the overall service life of the soft-pack battery cell 20. In the actual production and processing process, the forming process of the electrode assembly 22 and the assembly process of the heat conductive member 23 can be carried out simultaneously. Specifically, the heat conductive member 23 can be placed at the corresponding position during the winding or lamination process of the positive electrode sheet, the negative electrode sheet and the separator. In this way, when the electrode assembly 22 is formed, at least part of the heat conductive member 23 can also be inserted into the electrode assembly 22. Therefore, compared with the solution of inserting the heat conductive member 23 after the electrode assembly 22 is formed, the above method can effectively reduce the risk of curling and damage of the electrode sheet caused by the later insertion of the heat conductive member 23, and improve the production qualification rate of the soft-pack battery cell 20 as much as possible.

[0086] The soft-pack battery cell 20 provided in the embodiment of the present application can quickly transfer the internal heat of the electrode assembly 22 to the outside through the design of the above-mentioned heat conductive member 23, thereby increasing the cooling efficiency of the electrode assembly 22 away from the heat exchange interface, and at the same time reducing the temperature gradient between various positions inside the soft-pack battery cell 20, thereby effectively improving the uniformity of the internal temperature of the soft-pack battery cell 20, and helping to improve the efficiency and safety of the soft-pack battery cell 20 during the charging and discharging process, thereby optimizing the performance of the soft-pack battery cell 20 and extending the service life of the soft-pack battery cell 20.

[0087] According to some embodiments of the present application, referring to Figure 8 , and further refer to Fig. 9 The heat conducting member 23 includes a first heat conducting section 231 and an extension section 232 which are connected by bending. The first heat conducting section 231 is inserted into the electrode assembly 22, and at least a portion of the extension section 232 is attached to the outer wall surface of at least one side of the electrode assembly 22, and at least a portion of the extension section 232 is attached to the packaging film 21.

[0088] The first heat-conducting section 231 is suitable for being directly inserted into the interior of the electrode assembly 22 to effectively contact the electrode sheet and the diaphragm, thereby collecting the heat generated by the soft-pack battery cell 20 during the charging and discharging process.

[0089] The specific shape of the first heat conducting segment 231 can be customized according to the internal structure and size of the electrode assembly 22 to maintain good adaptability and thermal contact.

[0090] For example, in some embodiments, see Figure 6-Figure 9 As shown, the first heat conducting segment 231 is in the shape of a square plate.

[0091] The extension section 232 is suitable for being attached to the outer wall surface of the electrode assembly 22 and in close contact with the packaging film 21, so as to further transfer the heat collected by the first heat conducting section 231 to the packaging film 21, and finally perform heat exchange with the heat exchange plate through the packaging film 21.

[0092] The specific shape of the extension section 232 can be customized according to the shape and size of the electrode assembly 22 to provide a sufficient heat conduction area.

[0093] For example, in some embodiments, see Figure 6-Figure 9 As shown, the extension section 232 is in an L-shaped plate shape.

[0094] For example, in some other embodiments, the extension section 232 is in the shape of a square plate.

[0095] The first heat-conducting section 231 and the extending section 232 are connected by a bend. This design not only maintains the integrity and continuity of the heat-conducting member 23 , but also allows the heat-conducting member 23 to be flexibly arranged between the inside and outside of the electrode assembly 22 .

[0096] The first heat conducting section 231 and the extension section 232 may be an integrated structure, and the bending connection may be achieved by stamping, bending or other processing techniques, so that the connection has sufficient strength and heat conduction performance.

[0097] The soft-pack battery cell 20 provided in the embodiment of the present application has the structure in which the heat conductive member 23 is set to include a first heat conductive segment 231 and an extension segment 232. The first heat conductive segment 231 is directly inserted into the electrode assembly 22, so that the heat generated inside the electrode assembly 22 can be more effectively collected and quickly transferred to the packaging film 21 through the extension segment 232, so as to achieve rapid heat extraction. The extension segment 232 is attached to the outer wall surface of the electrode assembly 22, which not only helps to evenly distribute the internal heat to the entire soft-pack battery cell 20, but also reduces the temperature gradient between different positions inside the soft-pack battery cell 20, thereby improving the uniformity of the overall temperature of the soft-pack battery cell 20. At the same time, the design of the bent connection enables the heat conductive member 23 to be compactly arranged around the electrode assembly 22, without significantly increasing the volume or weight of the soft-pack battery cell 20, which is conducive to maintaining the lightness and energy density of the soft-pack battery cell 20.

[0098] According to some embodiments of the present application, referring to Fig. 9 A plurality of heat-conducting members 23 are provided, and at least a portion of the first heat-conducting segments 231 of the heat-conducting members 23 are separated by a portion of the pole pieces of the electrode assembly 22 .

[0099] Here, multiple means two or more.

[0100] For example, in some embodiments, reference Fig. 9 Two heat-conducting members 23 are provided, and the first heat-conducting sections 231 of the two heat-conducting members 23 are separated by part of the pole pieces of the electrode assembly 22 .

[0101] For example, in some other embodiments, six heat-conducting members 23 are provided, among which the first heat-conducting segments 231 of four heat-conducting members 23 are separated by partial pole pieces of the electrode assembly 22 .

[0102] For example, in some other embodiments, four heat-conducting members 23 are provided, and the first heat-conducting segments 231 of any two adjacent heat-conducting members 23 are separated by a part of the electrode sheet of the electrode assembly 22 .

[0103] It is understandable that, when multiple heat-conducting members 23 are provided, the first heat-conducting sections 231 of at least some of the adjacent two heat-conducting members 23 are not directly adjacent, but are separated by some pole pieces inside the electrode assembly 22. On the one hand, the provision of multiple heat-conducting members 23 increases the heat conduction path, so that heat can be transferred from the inside of the soft-pack battery cell 20 to the external heat exchange plate more quickly, thereby improving the heat conduction efficiency; on the other hand, through the separation of the pole pieces, some or all of the heat-conducting members 23 can independently collect the heat in their respective areas, which can more evenly distribute the heat inside the electrode assembly 22, further reduce the temperature gradient, and thus maximize the uniformity of the temperature of the soft-pack battery cell 20. In addition, in actual design, the number and layout of the heat-conducting members 23 can be flexibly adjusted according to the specific size, shape and performance requirements of the soft-pack battery cell 20 to meet the needs of different application scenarios.

[0104] The soft-pack battery cell 20 provided in the embodiment of the present application is designed to have a layout in which the first heat-conducting sections 231 of at least part of the heat-conducting members 23 are separated by part of the pole pieces of the electrode assembly 22, so that part or all of the heat-conducting members 23 can independently collect heat from their respective areas, and can more evenly distribute the heat inside the electrode assembly 22, further reducing the temperature gradient, thereby maximizing the uniformity of the temperature of the soft-pack battery cell 20. At the same time, the provision of multiple heat-conducting members 23 directly increases the heat conduction path, so that heat can be transferred from the inside of the soft-pack battery cell 20 to the external heat exchange plate more quickly, further improving the heat conduction efficiency.

[0105] According to some embodiments of the present application, see Figure 6-Figure 9 As shown, the extension section 232 is disposed on the side of the electrode assembly 22 where the electrode ear 225 is not disposed.

[0106] Understandably, see Figure 6-Figure 9 As shown, the tab 225 is a key component for connecting the soft-pack battery cell 20 with an external circuit. By arranging the extension section 232 on the side where the tab 225 is not provided, the heat-conducting member 23 can be prevented from interfering with or damaging the function of the tab 225 during the heat conduction process, and the electrical connection of the soft-pack battery cell 20 can be kept stable and reliable. At the same time, by arranging the extension section 232 on the side where the tab 225 is not provided, the heat conduction path can be designed more flexibly. Such a layout helps to maximize the use of the space between the packaging film 21 and the electrode assembly 22, improve the heat conduction efficiency, and thus improve the overall performance and energy density of the soft-pack battery cell 20.

[0107] The soft-pack battery cell 20 provided in the embodiment of the present application is provided with the above-mentioned extension section 232 on the side of the electrode assembly 22 where the pole ear 225 is not provided, thereby reducing the interference between the pole ear 225 and the heat conductor 23, and can effectively avoid the situation where the heat conductor 23 interferes with or damages the function of the pole ear 225, thereby improving the stability and reliability of the electrical connection of the soft-pack battery cell 20. At the same time, the heat conduction path can be designed more flexibly, which helps to maximize the use of the space between the packaging film 21 and the electrode assembly 22, thereby improving the overall performance and energy density of the soft-pack battery cell 20.

[0108] According to some embodiments of the present application, the extension section 232 includes a second heat-conducting section 2321 that is bent and connected to the first heat-conducting section 231 , and the second heat-conducting section 2321 is attached to the outer wall surface of the electrode assembly 22 and the inner wall surface of the packaging film 21 .

[0109] In this embodiment, the first heat-conducting segment 231 and the second heat-conducting segment 2321 can be bent at a right angle, and the entire heat-conducting member 23 can be L-shaped. The first heat-conducting segment 231 can be inserted into the electrode assembly 22, and the second heat-conducting segment 2321 can be clamped between the outer wall surface of one side of the electrode assembly 22 and the inner wall surface of the packaging film 21. Therefore, the first heat-conducting segment 231 and the second heat-conducting segment 2321 can form a continuous heat-conducting path, thereby helping the heat inside the electrode assembly 22 to be quickly transferred to the packaging film 21.

[0110] The soft-pack battery cell 20 provided in the embodiment of the present application realizes rapid heat transfer from the first heat-conducting segment 231 to the second heat-conducting segment 2321 through the setting of the above-mentioned second heat-conducting segment 2321, thereby realizing efficient conduction of heat from the inside of the electrode assembly 22 to the packaging film 21. At the same time, by designing the heat-conducting member 23 as a two-stage structure, the overall structure of the heat-conducting member 23 is simplified as much as possible while fully matching the shape of the electrode assembly 22 in the insertion area, thereby reducing the weight and volume of the heat-conducting member 23, thereby realizing the overall miniaturization and lightweight of the soft-pack battery cell 20.

[0111] According to some embodiments of the present application, referring to Figure 8 , and further refer to Fig. 9 The extension section 232 also includes a third heat-conducting section 2322. The first heat-conducting section 231, the second heat-conducting section 2321 and the third heat-conducting section 2322 are bent and connected in sequence. The first heat-conducting section 231 and the third heat-conducting section 2322 are folded in the same direction relative to the second heat-conducting section 2321. The second heat-conducting section 2321 is attached to the outer wall surface of the electrode assembly 22 and the inner wall surface of the packaging film 21, wherein the third heat-conducting section 2322 is inserted into the electrode assembly 22; or, the third heat-conducting section 2322 is attached to the outer wall surface of the electrode assembly 22 and the inner wall surface of the packaging film 21.

[0112] In this embodiment, reference Figure 8 , and further refer to Fig. 9 The first heat-conducting segment 231 and the second heat-conducting segment 2321 can be bent at a right angle, and the second heat-conducting segment 2321 and the third heat-conducting segment 2322 can be bent at a right angle. The entire heat-conducting member 23 can be U-shaped, and the first heat-conducting segment 231 can be inserted into the electrode assembly 22, the second heat-conducting segment 2321 can be clamped between the outer wall surface of one side of the electrode assembly 22 and the inner wall surface of the packaging film 21, and the third heat-conducting segment 2322 can be clamped between the outer wall surface of one side of the electrode assembly 22 and the inner wall surface of the packaging film 21. Therefore, the first heat-conducting segment 231, the second heat-conducting segment 2321 and the third heat-conducting segment 2322 can form a continuous heat-conducting path, which can not only quickly guide the heat inside the electrode assembly 22 to the packaging film 21, but also quickly guide the two outer side walls of the electrode assembly 22 to the packaging film 21, thereby greatly increasing the heat exchange area and further reducing the temperature difference at various locations of the electrode assembly 22.

[0113] In other embodiments, the first heat-conducting segment 231 can be inserted into the electrode assembly 22, the second heat-conducting segment 2321 can be clamped between the outer wall surface of one side of the electrode assembly 22 and the inner wall surface of the packaging film 21, the third heat-conducting segment 2322 can be inserted into the electrode assembly 22, and the first heat-conducting segment 231 and the second heat-conducting segment 2321 can be separated by a partial electrode sheet of the electrode assembly 22.

[0114] The soft-pack battery cell 20 provided in the embodiment of the present application significantly increases the contact area between the heat conductive member 23 and the electrode assembly 22 and the packaging film 21 by setting the extension section 232 to include the second heat conductive section 2321 and the third heat conductive section 2322, which helps to transfer heat to the packaging film 21 more quickly and ultimately to the external heat exchange plate, while further reducing the temperature difference at various locations of the electrode assembly 22, thereby maximizing the overall temperature uniformity of the soft-pack battery cell 20.

[0115] According to some embodiments of the present application, see Figure 4 , Figure 6 and Figure 8 As shown, the electrode assembly 22 is of a wound type or a laminated type, and the extension section 232 extends from the side of the electrode assembly 22 opposite to the electrode ear 225 .

[0116] In this embodiment, see Figure 4 , Figure 6 and Figure 8 As shown, the electrode assembly 22 is of a wound type, and the electrode tab 225 can be led out from the top surface of the electrode assembly 22 , so the extension section 232 can extend from the bottom surface of the electrode assembly 22 .

[0117] In other embodiments, the electrode assembly 22 is of a wound type, and the electrode tab 225 can be led out from the bottom of the electrode assembly 22 , so that the extension section 232 can extend from the top of the electrode assembly 22 .

[0118] In some other embodiments, the electrode assembly 22 is of a laminated type, and the electrode tab 225 can be led out from the top surface of the electrode assembly 22 , so the extension section 232 can extend from the bottom surface of the electrode assembly 22 .

[0119] In some further embodiments, the electrode assembly 22 is of a laminated type, and the electrode tab 225 may be led out from the bottom of the electrode assembly 22 , so that the extension section 232 may extend from the top surface of the electrode assembly 22 .

[0120] In actual implementation, the heat conductive member 23 can be inserted into the wound electrode assembly 22 in the following manner: one or more target positions in the electrode assembly 22 can be pre-set before winding, and in the process of winding the positive electrode sheet, the negative electrode sheet, the separator and other materials into the electrode assembly 22, the relevant operator can place the corresponding heat conductive member 23 at the target position before winding to the target position, and then continue winding, so as to wrap and fix the portion of the heat conductive member 23 set at the target position. The heat conductive member 23 can be inserted into the laminated electrode assembly 22 in the following manner: one or more target positions in the electrode assembly 22 can be pre-set before lamination, and in the process of laminating the positive electrode sheet, the negative electrode sheet, the separator and other materials to form the electrode assembly 22, the relevant operator can place the corresponding heat conductive member 23 at the target position when laminating to the target position, and then continue laminating, so that the portion of the heat conductive member 23 set at the target position is covered by the sheet and the adjacent separator.

[0121] The soft-pack battery cell 20 provided in the embodiment of the present application is designed to minimize the interference of the heat conductor 23 with the pole ear 225 through the layout design of the above-mentioned extension section 232 extending from the side of the electrode assembly 22 opposite to the pole ear 225, thereby maintaining the stability and reliability of the electrical connection of the soft-pack battery cell 20, so that the soft-pack battery cell 20 can accommodate more electrode materials and electrolytes while maintaining a compact structure, thereby improving the energy density and endurance of the soft-pack battery cell 20.

[0122] According to some embodiments of the present application, two heat-conducting members 23 are provided, and the two heat-conducting members 23 are distributed along the thickness direction Y of the packaging film 21. The first heat-conducting sections 231 of the two heat-conducting members 23 are both inserted into the electrode assembly 22 and fit each other, and the extending sections 232 of the two heat-conducting members 23 are respectively fit to different areas of the bottom wall of the electrode assembly 22.

[0123] In this embodiment, each heat-conducting member 23 includes a first heat-conducting segment 231 and a second heat-conducting segment 2321. In other words, the two heat-conducting members 23 are both L-shaped. The tab 225 can be drawn out from the top surface of the electrode assembly 22, and the two heat-conducting members 23 are inserted into the electrode assembly 22 from the bottom of the electrode assembly 22. Specifically, the first heat-conducting segments 231 of the two heat-conducting members 23 are mutually attached and inserted into the electrode assembly 22, and the top surface of the first heat-conducting segments 231 of the two heat-conducting members 23 does not exceed the bottom surface of the tab 225 at the highest; the second heat-conducting segments 2321 of the two heat-conducting members 23 are clamped between the bottom wall of the electrode assembly 22 and the packaging film 21, and the second heat-conducting segments 2321 of the two heat-conducting members 23 are respectively attached to different areas of the bottom wall of the electrode assembly 22. The sizes of the first heat-conducting segment 231 and the second heat-conducting segment 2321 are designed in accordance with the principle of not interfering with the tab 225 and other components.

[0124] The soft-pack battery cell 20 provided in the embodiment of the present application is designed to have the two heat-conducting parts 23 in contact with each other inserted on the same side into the electrode assembly 22. On the one hand, it minimizes the damage of the heat-conducting parts 23 to the electrode material while reducing the difficulty of assembling the heat-conducting parts 23, thereby improving the production efficiency of the soft-pack battery cell 20. On the other hand, it maximizes the heat conduction path and increases the overall heat dissipation area of ​​the electrode assembly 22 without increasing the production cost and the overall volume and weight too much, thereby maximizing the heat conduction efficiency.

[0125] According to some embodiments of the present application, see Figure 4 , Figure 6 and Figure 8 As shown, the extension section 232 of one of the heat-conducting members 23 is also attached to the first side wall 221 of the electrode assembly 22, and the extension section 232 of the other heat-conducting member 23 is also attached to the second side wall 222 of the electrode assembly, wherein the first side wall 221 and the second side wall 222 are respectively located on opposite sides of the electrode assembly 22 along the thickness direction Y of the packaging film 21.

[0126] In this embodiment, see Figure 4 , Figure 6 and Figure 8As shown, each heat-conducting member 23 includes a first heat-conducting section 231, a second heat-conducting section 2321 and a third heat-conducting section 2322. In other words, the two heat-conducting members 23 are both U-shaped. The tab 225 can be drawn out from the top surface of the electrode assembly 22, and the two heat-conducting members 23 are inserted into the electrode assembly 22 from the bottom of the electrode assembly 22. Specifically, the first heat-conducting sections 231 of the two heat-conducting members 23 are mutually attached and inserted into the electrode assembly 22, and the top surface of the first heat-conducting sections 231 of the two heat-conducting members 23 does not exceed the bottom surface of the tab 225; the second heat-conducting sections 2321 of the two heat-conducting members 23 are clamped between the bottom wall of the electrode assembly 22 and the packaging film 21, and the second heat-conducting sections 2321 of the two heat-conducting members 23 are respectively They are respectively attached to different areas of the bottom wall of the electrode assembly 22; the third heat-conducting segment 2322 of one of the heat-conducting members 23 is clamped between the first side wall 221 of the electrode assembly 22 and one of the large surfaces of the packaging film 21, and the third heat-conducting segment 2322 of the other heat-conducting member 23 is clamped between the second side wall 222 of the electrode assembly 22 and the other large surface of the packaging film 21. The sizes of the first heat-conducting segment 231, the second heat-conducting segment 2321 and the third heat-conducting segment 2322 are designed in accordance with the principle of not interfering with the electrode ear 225 and other components.

[0127] The soft-pack battery cell 20 provided in the embodiment of the present application has a structural design in which the extended sections of the two heat-conducting members 23 are also respectively attached to the first side wall 221 and the second side wall 222. Without increasing the number of heat-conducting members 23, the heat exchange area between each heat-conducting member 23 and the electrode assembly 22 and the packaging film 21 is further expanded, so that the interior, bottom wall, first side wall 221 and second side wall 222 of the entire electrode assembly 22 can be cooled over a large area, thereby maximizing the overall temperature uniformity of the soft-pack battery cell 20.

[0128] According to some embodiments of the present application, see Figure 5 , Figure 7 and Fig. 9 As shown, the electrode assembly 22 is a laminate type, and the extension section 232 extends from the side of the electrode assembly 22 adjacent to the electrode ear 225.

[0129] In this embodiment, see Figure 5 , Figure 7 and Fig. 9 As shown, the electrode assembly 22 is a laminated type, the electrode tab 225 can be led out from the top surface of the electrode assembly 22, and the extension section 232 can extend from the side of the electrode assembly 22.

[0130] In other embodiments, the electrode assembly 22 is a laminated type, the electrode tab 225 can be led out from the top surface of the electrode assembly 22 , and the extension section 232 can extend from the side and bottom surface of the electrode assembly 22 .

[0131] The soft-pack battery cell 20 provided in the embodiment of the present application has a structural design in which the extension section 232 extends from the side of the electrode assembly 22 adjacent to the pole ear 225. Considering that the laminated electrode assembly 22 can provide a variety of assembly methods for the heat conductor 23 due to its own structural characteristics, the flexibility and diversity of the soft-pack battery cell 20 are increased, and the interference of the heat conductor 23 on the pole ear 225 is minimized, and the electrical connection of the soft-pack battery cell 20 is maintained stable and reliable, so that the soft-pack battery cell 20 can accommodate more electrode materials and electrolytes while maintaining a compact structure, thereby improving the energy density and endurance of the soft-pack battery cell 20.

[0132] According to some embodiments of the present application, two heat-conducting members 23 are provided, and the two heat-conducting members 23 are spaced apart along the thickness direction Y of the packaging film 21, and the first heat-conducting sections 231 of the two heat-conducting members 23 are separated and inserted inside the electrode assembly 22, wherein an extension section 232 of one heat-conducting member 23 is attached to the third side wall 223 of the electrode assembly 22, and an extension section 232 of the other heat-conducting member 23 is attached to the fourth side wall 224 of the electrode assembly 22, wherein the third side wall 223 and the fourth side wall 224 are respectively located on opposite sides of the electrode assembly 22 along the length direction X of the packaging film 21.

[0133] In this embodiment, each heat conducting member 23 includes a first heat conducting segment 231 and a second heat conducting segment 2321 . In other words, the two heat conducting members 23 are both L-shaped. The electrode assembly 22 is a stacked type, and the pole ear 225 can be led out from the top surface of the electrode assembly 22. The two heat-conducting members 23 are respectively inserted into the electrode assembly 22 from both sides of the electrode assembly 22 along the length direction X of the packaging film 21, and are staggered. Specifically, the first heat-conducting sections 231 of the two heat-conducting members 23 are both inserted into the electrode assembly 22 and separated by part of the pole sheets of the electrode assembly 22, and the top surfaces of the first heat-conducting sections 231 of the two heat-conducting members 23 do not exceed the bottom surface of the pole ear 225 at most; the second heat-conducting section 2321 of one of the heat-conducting members 23 is clamped between the third side wall 223 of the electrode assembly 22 and the packaging film 21, and the second heat-conducting section 2321 of the other heat-conducting member 23 is clamped between the fourth side wall 224 of the electrode assembly 22 and the packaging film 21. The sizes of the first heat-conducting section 231 and the second heat-conducting section 2321 are designed in accordance with the principle of not interfering with the pole ear 225 and other components.

[0134] The soft-pack battery cell 20 provided in the embodiment of the present application is designed to be assembled by inserting the two heat-conducting parts 23 on opposite sides of the stacked electrode assembly 22 in an offset manner, which helps to promote the temperature uniformity of the third side wall 223 and the fourth side wall 224 of the electrode assembly 22, reduce the accumulation of heat on a single side, and reduce the difficulty of assembling the heat-conducting part 23, thereby improving the production efficiency of the soft-pack battery cell 20. Under the premise of not increasing the production cost and the overall volume and weight too much, the heat conduction path is maximized, the overall heat dissipation area of ​​the electrode assembly 22 is increased, and the heat conduction efficiency is maximized.

[0135] According to some embodiments of the present application, see Figure 5 , Figure 7 and Fig. 9 As shown, the extension section 232 suitable for fitting with the third side wall 223 is also fitted to the first side wall 221 of the electrode assembly 22, and the extension section 232 suitable for fitting with the fourth side wall 224 is also fitted to the second side wall 222 of the electrode assembly 22, wherein the first side wall 221 and the second side wall 222 are respectively located on two opposite sides of the electrode assembly 22 along the thickness direction Y of the packaging film 21.

[0136] In this embodiment, see Figure 5 , Figure 7 and Fig. 9 As shown, each heat-conducting member 23 includes a first heat-conducting segment 231, a second heat-conducting segment 2321 and a third heat-conducting segment 2322. In other words, the two heat-conducting members 23 are both U-shaped. The electrode assembly 22 is a laminated type, and the pole ear 225 can be led out from the top surface of the electrode assembly 22. The two heat-conducting members 23 are respectively inserted into the electrode assembly 22 from both sides of the electrode assembly 22 along the length direction X of the packaging film 21. Specifically, the first heat-conducting segments 231 of the two heat-conducting members 23 are inserted into the electrode assembly 22 and separated by part of the pole pieces of the electrode assembly 22. The top surface of the first heat-conducting segments 231 of the two heat-conducting members 23 does not exceed the bottom surface of the pole ear 225; the second heat-conducting segment 2321 of one of the heat-conducting members 23 is clamped between the third side wall 223 of the electrode assembly 22 and the packaging film 21. The second heat-conducting section 2321 of another heat-conducting member 23 is clamped between the fourth side wall 224 of the electrode assembly 22 and the packaging film 21; the third heat-conducting section 2322 of one of the heat-conducting members 23 is clamped between the first side wall 221 of the electrode assembly 22 and one of the large surfaces of the packaging film 21, and the third heat-conducting section 2322 of another heat-conducting member 23 is clamped between the second side wall 222 of the electrode assembly 22 and the other large surface of the packaging film 21. The sizes of the first heat-conducting section 231, the second heat-conducting section 2321 and the third heat-conducting section 2322 are designed in accordance with the principle of not interfering with the electrode ear 225 and other components.

[0137] In other embodiments, the electrode assembly 22 is of a stacked type, the electrode ear 225 is led out from the top surface of the electrode assembly 22, a plurality of heat conductive members 23 may be provided, and the extension sections 232 of a portion of the plurality of heat conductive members 23 may extend from the side surface of the electrode assembly 22, and the extension sections 232 of another portion of the plurality of heat conductive members 23 may extend from the bottom surface of the electrode assembly 22.

[0138] In some other embodiments, the electrode assembly 22 is a laminated type, the tab 225 is extended from the top surface of the electrode assembly 22 , and a plurality of heat conductive members 23 may be provided, wherein the extension section 232 of each heat conductive member 23 may extend from the bottom surface of the electrode assembly 22 .

[0139] The soft-pack battery cell 20 provided in the embodiment of the present application is designed to have an extension section 232 of one of the heat-conducting members 23 affixed to the first side wall 221 and the third side wall 223 and an extension section 232 of the other heat-conducting member 23 affixed to the second side wall 222 and the fourth side wall 224. Under the premise of not increasing the number of heat-conducting members 23, the heat exchange area between each heat-conducting member 23 and the laminated electrode assembly 22 and the packaging film 21 is further expanded, so that the interior of the entire laminated electrode assembly 22, the first side wall 221, the second side wall 222, the third side wall 223 and the fourth side wall 224 can be cooled over a large area, thereby maximizing the overall temperature uniformity of the soft-pack battery cell 20.

[0140] According to some embodiments of the present application, the present application further provides a battery device 100 , which includes a plurality of soft-pack battery cells 20 and a heat exchange plate of any of the above schemes, and the heat exchange plate is used for exchanging heat with the soft-pack battery cells 20 .

[0141] For example, refer to Figure 3 The battery device 100 may further include a heat transfer member 30, which is used to quickly transfer heat from the packaging film of the soft-pack battery cell 20 to the heat exchange plate.

[0142] The heat exchange plate may be installed at the bottom or side of the plurality of soft-pack battery cells 20 , which is not limited here.

[0143] The heat exchange plate may be a liquid-cooled heat exchange plate, a direct-cooled heat exchange plate or other forms, which is not limited in the embodiments of the present application.

[0144] The heat transfer member 30 may be attached to the outer surface of the soft-pack battery cell 20 .

[0145] For example, in some embodiments, reference Figure 3 The heat transfer member 30 is attached to the bottom surface and one of the large surfaces of the soft-pack battery cell 20 .

[0146] For example, in other embodiments, the heat transfer member 30 is attached to the bottom surface of the soft-pack battery cell 20 and two large surfaces along the thickness direction of the packaging film.

[0147] For example, in some other embodiments, the heat transfer member 30 is attached to the bottom surface of the soft-pack battery cell 20 .

[0148] According to some embodiments of the present application, the present application further provides an electric device, which includes the above battery device 100, and the battery device 100 is used to provide electric energy.

[0149] The power-consuming device may be any of the aforementioned devices or systems using the battery device 100 .

[0150] According to some embodiments of the present application, see Figure 3 , Figure 4 , Figure 6 as well as Figure 8 As shown, the present application provides a soft-pack battery cell 20, which includes: a packaging film 21, an electrode assembly 22 and a heat-conducting member 23, wherein the electrode assembly 22 is accommodated in the packaging film 21; at least part of the heat-conducting member 23 is inserted into the electrode assembly 22, and at least part of the heat-conducting member 23 is located outside the electrode assembly 22 and exchanges heat with the packaging film 21. The heat-conducting member 23 includes a first heat-conducting section 231 and an extension section 232 connected by bending, wherein the first heat-conducting section 231 is inserted into the electrode assembly 22, and at least part of the extension section 232 is attached to the outer wall surface of at least one side of the electrode assembly 22 and attached to the packaging film 21. The extension section 232 is provided on the side of the electrode assembly 22 where the pole ear 225 is not provided. The extension section 232 includes a second heat-conducting section 2321 and a third heat-conducting section 2322. The first heat-conducting section 231, the second heat-conducting section 2321 and the third heat-conducting section 2322 are bent and connected in sequence. The first heat-conducting section 231 and the third heat-conducting section 2322 are folded in the same direction relative to the second heat-conducting section 2321. The second heat-conducting section 2321 is attached to the outer wall surface of the electrode assembly 22 and the inner wall surface of the packaging film 21, wherein the third heat-conducting section 2322 is attached to the outer wall surface of the electrode assembly 22 and the inner wall surface of the packaging film 21. The electrode assembly 22 is a winding type, and the extension section 232 extends from the side of the electrode assembly 22 opposite to the pole ear 225. Two heat-conducting members 23 are provided, and the two heat-conducting members 23 are distributed along the thickness direction Y of the packaging film 21. The first heat-conducting sections 231 of the two heat-conducting members 23 are both inserted into the electrode assembly 22 and fit each other, wherein an extension section 232 of one heat-conducting member 23 fits the bottom wall and the first side wall 221 of the electrode assembly 22, and an extension section 232 of the other heat-conducting member 23 fits the bottom wall and the second side wall 222 of the electrode assembly 22, wherein the first side wall 221 and the second side wall 222 are respectively located on opposite sides of the electrode assembly 22 along the thickness direction Y of the packaging film 21.

[0151] If not otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0152] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0153] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A soft pack battery cell, characterized in that: include: Packaging film; An electrode assembly is contained in the packaging film; A heat conductive member, at least a portion of which is inserted into the electrode assembly, and at least a portion of which is located outside the electrode assembly and exchanges heat with the packaging film.

2. The soft-pack battery cell according to claim 1, characterized in that: The heat conducting member includes a first heat conducting section and an extension section which are connected by bending. The first heat conducting section is inserted into the electrode assembly. At least a portion of the extension section is attached to the outer wall surface of at least one side of the electrode assembly and to the packaging film.

3. The soft-pack battery cell according to claim 2, characterized in that: The heat conducting members are provided in plurality, and the first heat conducting sections of at least some of the heat conducting members are separated by some pole pieces of the electrode assembly.

4. The soft-pack battery cell according to claim 2, characterized in that: The extension section is arranged on a side of the electrode assembly where no electrode ear is arranged.

5. The soft-pack battery cell according to claim 2, characterized in that: The extension section includes a second heat-conducting section connected to the first heat-conducting section by a bend, and the second heat-conducting section is attached to the outer wall surface of the electrode assembly and the inner wall surface of the packaging film.

6. The soft-pack battery cell according to claim 5, characterized in that: The extension section further includes a third heat-conducting section, the first heat-conducting section, the second heat-conducting section and the third heat-conducting section are bent and connected in sequence, and the first heat-conducting section and the third heat-conducting section are folded in the same direction relative to the second heat-conducting section, wherein: The third heat-conducting section is inserted into the electrode assembly; or the third heat-conducting section is attached to the outer wall surface of the electrode assembly and the inner wall surface of the packaging film.

7. The soft-pack battery cell according to any one of claims 2 to 6, characterized in that: The electrode assembly is of a winding type or a stacked type, and the extension section extends from a side surface of the electrode assembly opposite to the electrode ear.

8. The soft-pack battery cell according to claim 7, characterized in that: Two heat-conducting members are provided, and the two heat-conducting members are distributed along the thickness direction of the packaging film. The first heat-conducting sections of the two heat-conducting members are inserted into the electrode assembly and fit each other, and the extending sections of the two heat-conducting members are respectively fit to different areas of the bottom wall of the electrode assembly.

9. The soft-pack battery cell according to claim 8, characterized in that: The extended section of one of the heat conductive members is also attached to the first side wall of the electrode assembly, and the extended section of the other heat conductive member is also attached to the second side wall of the electrode assembly, wherein the first side wall and the second side wall are respectively located on opposite sides of the electrode assembly along the thickness direction of the packaging film.

10. The soft-pack battery cell according to any one of claims 2 to 6, characterized in that: The electrode assembly is of a laminated type, and the extension section extends from a side surface of the electrode assembly adjacent to the electrode ear.

11. The soft-pack battery cell according to claim 10, characterized in that: Two heat-conducting members are provided, and the two heat-conducting members are spaced apart along the thickness direction of the packaging film, and the first heat-conducting sections of the two heat-conducting members are separately inserted inside the electrode assembly, wherein the extension section of one of the heat-conducting members is attached to the third side wall of the electrode assembly, and the extension section of the other heat-conducting member is attached to the fourth side wall of the electrode assembly, wherein the third side wall and the fourth side wall are respectively located on opposite sides of the electrode assembly along the length direction of the packaging film.

12. The soft-pack battery cell according to claim 11, characterized in that: The extension section suitable for fitting with the third side wall also fits with the first side wall of the electrode assembly, and the extension section suitable for fitting with the fourth side wall also fits with the second side wall of the electrode assembly, wherein the first side wall and the second side wall are respectively located on opposite sides of the electrode assembly along the thickness direction of the packaging film.

13. A battery device, characterized in that: include: A plurality of soft-pack battery cells according to any one of claims 1 to 12; A heat exchange plate, wherein the heat exchange plate is used to exchange heat with the soft-pack battery cell.

14. An electrical device, characterized in that: Comprising a battery device as claimed in claim 13, the battery device is used to provide electrical energy.

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