Battery apparatus and electric device

Abstract

A battery apparatus (100) and an electric device. The battery apparatus (100) comprises a plurality of pouch cells (10) and heat dissipation members (20); the plurality of pouch cells (10) are arranged in a first direction; and each heat dissipation member (20) is arranged between two adjacent pouch cells (10).

Description

Battery devices and electrical equipment Technical Field

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

[0002] In related technologies, batteries are widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. Batteries can be broadly classified into pouch batteries and hard-shell batteries based on the rigidity of their casing. Pouch batteries have advantages such as higher mass / volume energy density and better safety, leading to their increasingly widespread application. During charging and discharging, pouch batteries inevitably generate heat. High temperatures can negatively impact their performance. Therefore, reducing the temperature rise of pouch batteries is a key technical problem to be solved. Summary of the Invention

[0003] This application provides a battery device and an electrical appliance that can reduce the temperature rise of pouch batteries.

[0004] The battery device according to the present application includes a plurality of pouch cells and a heat sink, wherein the plurality of pouch cells are arranged along a first direction; the heat sink is disposed between two adjacent pouch cells.

[0005] In the battery device described above, a heat sink is disposed between two adjacent pouch cells. The heat sink can quickly transfer and dissipate the heat of the pouch cells to the surrounding environment, thereby reducing the temperature rise of the pouch cells and improving their performance.

[0006] In some embodiments of this application, the pouch cell includes a first outer surface, which is the largest surface of the pouch cell. The first outer surfaces of a plurality of pouch cells are arranged along the first direction, and the heat sink is disposed between the first outer surfaces of two adjacent pouch cells.

[0007] In the above technical solution, since the first outer surface is the largest surface of the pouch cell, the heat sink is disposed between the first outer surfaces of two adjacent pouch cells, which makes the heat transfer efficiency between the heat sink and the pouch cell higher and can reduce the temperature rise of the pouch battery more quickly.

[0008] In some embodiments of this application, the projection of the heat sink in the first direction lies within the first outer surface of the pouch cell.

[0009] In the above technical solution, the size of the heat sink is smaller than that of the pouch cell. While the heat sink meets the requirements for heat transfer, it occupies less space in the battery device, thereby improving the energy density of the battery device.

[0010] In some embodiments of this application, the surface of the heat sink facing the pouch cell is planar.

[0011] In the above technical solution, the surface of the heat sink facing the pouch cell is flat, which increases the contact area between the heat sink and the pouch cell when they come into contact, thereby improving the heat transfer efficiency between them.

[0012] In some embodiments of this application, the heat sink is spaced apart from the pouch cell.

[0013] In the above technical solution, since the pouch cell will inevitably expand and deform during use, the heat sink is spaced apart from the pouch cell. This provides a certain space for the expansion and deformation of the pouch cell, reduces the stress of the pouch cell, and improves the working performance of the pouch cell.

[0014] In some embodiments of this application, the heat sink is a solid structural component.

[0015] In the above technical solutions, solid heat sinks have higher heat conduction efficiency, which can improve the efficiency of heat sinks in transferring heat to the surrounding environment.

[0016] In some embodiments of this application, the heat sink is a plate of uniform thickness, and the thickness direction of the heat sink is the same as the first direction.

[0017] In the above technical solution, the heat sink with equal thickness makes the heat conduction efficiency of each part of the heat sink approximately the same, which can improve the consistency of heat transfer of the heat sink.

[0018] In some embodiments of this application, the heat sink is a metal component.

[0019] In the above technical solutions, the heat sink made of metal has good thermal conductivity, which can improve the heat conduction efficiency of the heat sink. In addition, the heat sink has high strength, which can support the pouch cell when it is subjected to impact, reduce the degree of deformation of the pouch cell, and improve the stability of the pouch cell in use.

[0020] In some embodiments of this application, the thickness of the heat sink is D1, where 0.2mm≤D1≤2mm.

[0021] In the above technical solutions, when the thickness of the heat sink is within the above range, the heat sink is easy to manufacture, has a suitable volume, occupies less space, can improve the energy density of the battery device, and has high thermal conductivity.

[0022] In some embodiments of this application, the battery device includes a support member disposed at the edge of the heat sink and abutting against the pouch cell.

[0023] In the above technical solution, the support component can provide support for the pouch cell, thereby improving the positional stability of the pouch cell.

[0024] In some embodiments of this application, the support surrounds the heat sink.

[0025] In the above technical solution, the support member can limit the position of the heat sink, improving its positional stability and thus enhancing its heat dissipation effect on the pouch cell. Furthermore, the support member has more contact points with the pouch cell, further improving its support effect.

[0026] In some embodiments of this application, the pouch cell includes a first outer surface, which is the largest surface of the pouch cell. The first outer surface of the pouch cell is arranged along the first direction. The heat sink is disposed between the first outer surfaces of two adjacent pouch cells. The outer contour area of ​​the support member is smaller than the area of ​​the first outer surface of the pouch cell.

[0027] In the above technical solution, the outer contour area of ​​the support member is smaller than the area of ​​the first outer surface of the soft-pack battery cell. When the support member can support the soft-pack battery cell, the support member occupies less space in the battery device, thereby improving the energy density of the battery device.

[0028] In some embodiments of this application, the support member is combined with the side of the heat sink member.

[0029] In the above technical solution, the side connection between the support and the heat sink not only allows the support and the heat sink to form a whole, which facilitates the reduction of the number of parts in the battery assembly process and improves the assembly efficiency of the battery device, but also allows the heat sink to maintain a stable position under the connection of the support, thereby improving the heat dissipation effect of the heat sink on the soft-pack battery cell.

[0030] In some embodiments of this application, the thickness of the support member is greater than the thickness of the heat sink member along the first direction.

[0031] In the above technical solution, the support member is arranged such that at least one side of the heat sink is spaced apart from the corresponding pouch cell, providing space for the expansion and deformation of the pouch cell.

[0032] In some embodiments of this application, the thickness ratio of the support member to the pouch cell is less than 10% along the first direction.

[0033] In the above technical solution, the thickness ratio of the support component to the soft-pack cell is relatively small, that is, the support component occupies less space, while the soft-pack cell occupies more space, which can improve the energy density of the battery device.

[0034] In some embodiments of this application, the support is made of a polypropylene-based material.

[0035] In the above technical solutions, the support component has good insulation performance, which can improve the stability of the battery device. In addition, the support component has relatively stable chemical properties, which can improve the life of the battery device.

[0036] In some embodiments of this application, the support member is a deformable elastic member.

[0037] In the above technical solution, the support can deform, which can reduce the stress on the soft-pack battery cell and improve its stability during the expansion and deformation process.

[0038] In some embodiments of this application, the battery device includes a water-cooled plate, and the pouch cell is thermally connected to the water-cooled plate.

[0039] In the above technical solution, the water-cooled plate can cool the pouch cell and reduce the temperature rise of the pouch cell.

[0040] In some embodiments of this application, the pouch cell rests against the water-cooling plate along a second direction, where the first direction intersects the second direction.

[0041] In the above technical solution, the pouch cell rests on the water-cooled plate, which brings the pouch cell closer to the water-cooled plate. This improves the heat exchange efficiency between the pouch cell and the water-cooled plate, thereby quickly reducing the temperature rise of the pouch cell.

[0042] In some embodiments of this application, a heat-conducting element is provided between the water-cooled plate and the pouch cell, and the heat-conducting element connects the pouch cell and the water-cooled plate.

[0043] In the above technical solution, the heat-conducting component can improve the heat exchange efficiency between the water-cooled plate and the pouch cell, which is beneficial for the water-cooled plate to cool the pouch cell.

[0044] According to some embodiments of this application, optionally, the pouch cell is any one of lithium iron phosphate battery cell, ternary battery cell, and solid-state battery cell.

[0045] In the above technical solutions, the use of the aforementioned types of pouch cells provides more options for battery device design to meet different application needs. Specifically, pouch cells are lithium iron phosphate battery cells, which have advantages such as high reliability, long cycle life, light weight, large capacity, and low internal resistance; pouch cells are ternary lithium battery cells, which have advantages such as high energy density and good electrochemical performance; and pouch cells are solid-state battery cells, which have advantages such as high energy density, high reliability, light weight, and good high and low temperature performance.

[0046] According to some embodiments of this application, optionally, the pouch cell is a lithium iron phosphate battery cell, and the ratio of the amount of positive active material, binder and conductive agent in the positive electrode material of the pouch cell is 96:(1-3):(1-3); and / or, the pouch cell is a ternary battery cell, and the ratio of the amount of the amount of positive active material, binder and conductive agent in the positive electrode material of the pouch cell is 96:(2-3):(1-2).

[0047] In the above technical solutions, when the pouch cell is a lithium iron phosphate battery cell, a high proportion of positive electrode active material means that more substances capable of electrochemical reactions can be accommodated within a limited electrode assembly. This is beneficial for increasing the capacity and energy density of the battery device, allowing the lithium iron phosphate battery cell to output higher power while maintaining a relatively small volume and weight, meeting the application scenarios with certain energy density requirements. Using the above-mentioned range for binder and conductive agent dosages can reduce the cost of auxiliary materials, thereby reducing the overall cost of the battery device. When the pouch cell is a ternary lithium battery cell, due to the relatively complex structure and surface properties of ternary materials, using the above-mentioned proportions of positive electrode active material, binder, and conductive agent helps ensure good adhesion between positive electrode active material particles and between the active material and the current collector, thereby improving the mechanical stability and integrity of the electrode assembly. This helps reduce the risk of active material shedding and electrode pulverization during charging and discharging, and extends the cycle life of the battery device.

[0048] An electrical device comprising the battery device described in any of the above embodiments.

[0049] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0050] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0051] Figure 1 is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0052] Figure 2 is an exploded perspective view of a battery device according to some embodiments of this application;

[0053] Figure 3 is a partial schematic diagram of a battery device according to some embodiments of this application;

[0054] Figure 4 is a second partial schematic diagram of a battery device according to some embodiments of this application;

[0055] Figure 5 is a partially exploded view of a battery device according to some embodiments of this application;

[0056] Figure 6 is a partial structural schematic diagram of a battery device according to some embodiments of this application.

[0057] Explanation of reference numerals in the attached drawings: 100-Battery assembly; 110-Casing; 10-Soft-pack battery cell; 11-First outer surface; 12-Second outer surface; 20-Heat dissipation component; 21-Side panel; 30-Support component; 40-Water cooling plate; 50-Heat conductive component; 1000-Vehicle; 200-Controller; 300-Motor. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0059] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0060] In this application, the reference to "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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0061] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0062] 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, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0063] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0064] In this application, "multiple" means two or more (including two).

[0065] In the embodiments of this application, unless otherwise specified, all implementation methods and optional implementation methods of this application can be combined with each other to form new technical solutions.

[0066] In the embodiments of this application, unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form new technical solutions.

[0067] In related technologies, batteries are widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. Batteries can be broadly classified into pouch batteries and hard-shell batteries based on the rigidity of their casing. Pouch batteries have advantages such as higher mass / volume energy density and better safety, leading to their increasingly widespread application. During charging and discharging, pouch batteries inevitably generate heat. If the temperature of a pouch battery is too high, it will affect its performance.

[0068] For example, after thermal runaway occurs in a pouch cell, due to the poor thermal conductivity of the pouch cell itself, two adjacent pouch cells come into contact with each other. This makes it difficult for the heat generated by the thermally runaway pouch cell to dissipate quickly, which causes the temperature of the adjacent pouch cells to rise rapidly, increasing the risk of thermal runaway.

[0069] Therefore, this application provides a battery device, which includes a plurality of pouch cells and a heat sink, wherein the plurality of pouch cells are arranged along a first direction; and the heat sink is disposed between two adjacent pouch cells.

[0070] In the battery device described above, a heat sink is disposed between two adjacent pouch cells. The heat sink can quickly transfer and dissipate the heat of the pouch cells to the surrounding environment, thereby reducing the temperature rise of the pouch cells and improving their performance.

[0071] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0072] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0073] Referring to Figure 1, vehicle 1000 can be a new energy vehicle, which can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. Further, vehicle 1000 can be a commercial vehicle. A battery device 100 is installed inside vehicle 1000, which can be located at the bottom, front, or rear of vehicle 1000. Battery device 100 can be used to power vehicle 1000; for example, battery device 100 can serve as the operating power source for vehicle 1000. Vehicle 1000 may also include a controller 200 and a motor 300. Controller 200 controls the battery device 100 to supply power to motor 300, for example, to meet the power needs of vehicle 1000 during starting, navigation, and driving.

[0074] 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.

[0075] Referring to Figure 2, in the embodiments of this application, the battery apparatus 100 may include one or more cell assemblies for providing voltage and capacity. The cell assembly may include multiple pouch cells 10, which are connected in series, parallel, or mixed connections via busbars. For example, a cell assembly is typically formed by arranging multiple pouch cells 10; a cell assembly may also be a battery module, which is formed by arranging and fixing multiple pouch cells 10 into a single module. As an example, a battery module may be formed by bundling multiple pouch cells 10 together with cable ties.

[0076] The battery device 100 can be a battery pack, which includes a housing 110 and one or more cell assemblies housed within the housing 110. The cell assembly can be a battery module, which can be housed within the housing 110 by fixing the battery module to the housing 110; alternatively, the cell assembly can be housed within the housing 110 by directly fixing multiple pouch cells 10 to the housing 110.

[0077] In embodiments of this application, the housing 110 may include a first housing and a second housing. The first housing and the second housing are fastened together, forming a closed space inside the housing 110 to house the battery cell assembly. Here, "closed" refers to covering or shutting off; it can be sealed or unsealed. The first housing may be a top cover or a bottom plate. For example, the housing 110 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, forming a closed space inside the housing 110 to house the battery cell assembly.

[0078] In embodiments of this application, the housing 110 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 110 can be at least a portion of the floor of the vehicle 1000, or a portion of the housing 110 can be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0079] In this embodiment, the pouch cell 10 can be a secondary battery, which refers to a pouch cell 10 that can be recharged after discharge to activate the active materials and continue to be used. The pouch cell 10 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 this embodiment is not limited to this. The pouch cell 10 can be flat, cuboid, or other shapes, and this embodiment is not limited to these shapes either.

[0080] Please refer to Figures 3-5. The battery device 100 of this application embodiment includes a plurality of pouch cells 10 and a heat sink 20. The plurality of pouch cells 10 are arranged along a first direction X. The heat sink 20 is disposed between two adjacent pouch cells 10.

[0081] Specifically, the pouch cell 10 can have a flexible outer shell. The flexible outer shell of the pouch cell 10 has good flexibility and can be formed into a pouch shape. The electrode assembly of the pouch cell 10 is housed inside the flexible outer shell, making the pouch cell 10 a pouch battery. For example, the flexible outer shell can be an aluminum-plastic film.

[0082] The electrode assembly of the pouch cell 10 can be a wound electrode assembly or a stacked electrode assembly. The electrode assembly can include electrode sheets and tabs. The electrode assembly can be formed by winding electrode sheets or by stacking electrode sheets.

[0083] Multiple pouch cells 10 can be cells with identical dimensions, shapes, and other parameters, or at least two pouch cells 10 can have different parameters. The first direction X can be the horizontal direction under normal operating conditions of the battery device 100.

[0084] The heat sink 20 has excellent thermal conductivity, which is superior to that of the pouch cell 10. The heat generated by the pouch cell 10 can be transferred to the heat sink 20, which then transfers the heat to the surrounding environment. The "surrounding environment" referred to here can be the pouch cell 10, the atmosphere, or other substances that can exchange heat with the heat sink 20.

[0085] It should be noted that the number of heat sinks 20 can be one or more. When there are multiple heat sinks 20, the heat sinks 20 can be set between any two adjacent pouch cells 10, or the heat sinks 20 can be set between some of the two adjacent pouch cells 10.

[0086] Therefore, in the battery device 100 of the above embodiment, the heat sink 20 is disposed between two adjacent pouch cells 10. The heat sink 20 can quickly transfer and dissipate the heat of the pouch cell 10 to the surrounding environment, thereby reducing the temperature rise of the pouch cell 10 and improving the working performance of the pouch cell 10.

[0087] For example, in a plurality of pouch cells 10, if one of the pouch cells 10 experiences thermal runaway and generates a large amount of heat, the heat sink 20 near the thermal runaway can evenly transfer the heat to the other pouch cells 10, reducing the risk of another pouch cell 10 adjacent to the thermally runaway pouch cell 10 experiencing thermal runaway.

[0088] Please refer to Figure 3. In some embodiments of this application, the pouch cell 10 includes a first outer surface 11, which is the largest surface of the pouch cell 10. The first outer surface 11 of a plurality of pouch cells 10 are arranged along a first direction X. The heat sink 20 is disposed between the first outer surfaces 11 of two adjacent pouch cells 10.

[0089] Specifically, the pouch cell 10 can be flat, and it may also include a second outer surface 12 connected to the first outer surface 11, the area of ​​which is smaller than the area of ​​the first outer surface 11. The first outer surface 11 is substantially perpendicular to the first direction X. For example, the angle between the normal of the first outer surface 11 and the first direction X can be less than 30°.

[0090] It is understandable that when the first outer surface 11 of the pouch cell 10 is the largest surface area, most of the heat generated by the pouch cell 10 is also dissipated through the first outer surface 11, and the heat of the pouch cell 10 is mainly concentrated on the first outer surface 11. Therefore, the heat sink 20 is disposed between the first outer surfaces 11 of two adjacent pouch cells 10, which makes the heat transfer efficiency between the heat sink 20 and the pouch cell 10 higher, and can reduce the temperature rise of the pouch battery more quickly.

[0091] Referring to Figure 3, in some embodiments of this application, the projection of the heat sink 20 in the first direction X lies within the first outer surface 11 of the pouch cell 10. Alternatively, the outer contour of the first outer surface 11 can surround the outer contour of the projection of the heat sink 20 in the first direction X. For example, the outer contour of the first outer surface 11 can be a first square, and the outer contour of the projection of the heat sink 20 in the first direction X can be a second square, with the first direction X contained within the second square.

[0092] Therefore, the heat sink 20 is recessed relative to the outline of the pouch cell 10 and will not protrude from the pouch cell 10. This reduces the probability of interference with surrounding components and also makes the pouch cell 10 occupy a larger space in the overall battery device 100.

[0093] Thus, in the above technical solution, the size of the heat sink 20 is smaller than the size of the soft-pack battery cell 10. While the heat sink 20 satisfies the heat transfer requirement, the heat sink 20 occupies less space in the battery device 100, thereby increasing the energy density of the battery device 100.

[0094] In some embodiments of this application, the surface of the heat sink 20 facing the pouch cell 10 is planar.

[0095] In the above technical solution, the surface of the heat sink 20 facing the pouch cell 10 is flat, which increases the contact area between the heat sink 20 and the pouch cell when they come into contact, thereby improving the heat transfer efficiency between them. Furthermore, the heat sink 20 is easy to manufacture, reducing its manufacturing cost.

[0096] Referring to Figure 3, in some embodiments of this application, the heat sink 20 and the pouch cell 10 are spaced apart. Alternatively, there is a gap between the heat sink 20 and the pouch cell 10. It should be noted that the gap between the heat sink 20 and the pouch cell 10 is formed when the pouch cell 10 has not expanded or deformed, or has only a low degree of deformation. When the pouch cell 10 expands and deforms significantly, it can contact the heat sink 20.

[0097] In the above technical solution, since the soft-pack battery cell 10 will inevitably expand and deform during use, the heat sink 20 is spaced apart from the soft-pack battery cell 10. This provides a certain space for the expansion and deformation of the soft-pack battery cell 10, reduces the stress of the soft-pack battery cell 10, and improves the working performance of the soft-pack battery cell 10.

[0098] In some embodiments of this application, the heat sink 20 is a solid structure. In other words, the heat sink 20 has no internal holes or other structures, resulting in consistent thermal conductivity across all parts of the heat sink 20. Therefore, in the above-described technical solution, the solid heat sink 20 has higher thermal conductivity, which improves the efficiency of heat transfer from the heat sink 20 to the surrounding environment.

[0099] Referring to Figure 3, in some embodiments of this application, the heat sink 20 is a plate-shaped component of uniform thickness, and the thickness direction of the heat sink 20 is the same as the first direction X. In other words, the thickness of the heat sink 20 is equal everywhere along the first direction X.

[0100] In the above technical solution, the heat sink 20 with uniform thickness makes the heat conduction efficiency of each position of the heat sink 20 approximately the same, which can improve the consistency of heat transfer of the heat sink 20.

[0101] In some embodiments of this application, the heat sink 20 is a metal component. For example, the material of the heat sink 20 can be aluminum, steel, or copper. In the above technical solutions, the heat sink 20 made of metal has better thermal conductivity, which can improve the thermal conductivity efficiency of the heat sink 20. In addition, the heat sink 20 has high strength, which can support the pouch cell 10 when it is subjected to impact, reduce the deformation of the pouch cell 10, and improve the stability of the pouch cell 10 in use.

[0102] Please refer to Figure 3. In some embodiments of this application, the thickness of the heat sink 20 is D1, where 0.2mm ≤ D1 ≤ 2mm. For example, the thickness D1 of the heat sink 20 can be 0.2mm, 0.3mm, 0.8mm, 1.5mm, 2mm, etc.

[0103] In the above technical solution, the thickness D1 of the heat sink 20 is greater than or equal to 0.2 mm, which makes the heat sink 20 easy to manufacture. In addition, the thickness of the heat sink 20 is less than or equal to 2 mm, which makes the volume of the heat sink 20 suitable and the space occupied is small, which can improve the energy density of the battery device 100 and has high thermal conductivity.

[0104] Referring to Figures 3-5, in some embodiments of this application, the battery device 100 includes a support member 30, which is disposed at the edge of the heat sink 20 and abuts against the pouch cell 10. Specifically, the support member 30 may be disposed at one edge or all edges of the heat sink 20. The support member 30 connects two adjacent pouch cells 10, preventing relative movement between adjacent pouch cells 10.

[0105] In the above technical solution, the support member 30 can provide support for the soft-pack battery cell 10 and improve the positional stability of the soft-pack battery cell 10.

[0106] In some embodiments of this application, the support member 30 surrounds the heat sink 20. Specifically, the support member 30 may be frame-shaped, extending circumferentially along the heat sink 20, and connected at all edges of the support member 30.

[0107] In the above technical solution, the support member 30 can limit the position of the heat sink 20, improve the positional stability of the heat sink 20, and thus improve the heat dissipation effect of the heat sink 20 on the pouch cell 10. In addition, the support member 30 has more contact points with the pouch cell 10, improving the support effect of the support member 30 on the pouch cell 10.

[0108] Please refer to Figures 3-5. In some embodiments of this application, the outer contour area of ​​the support member 30 is smaller than the area of ​​the first outer surface 11 of the pouch cell 10.

[0109] Specifically, the outer contour area of ​​the support member 30 refers to the area enclosed by the outer contour of the projection formed by the support member 30 along the first direction X. The outer contour area of ​​the support member 30 is smaller than the area of ​​the first outer surface 11 of the pouch cell 10, that is, the projection of the support member 30 along the first direction X onto the first outer surface 11 lies within the first outer surface 11. For example, the support member 30 has four outer edges, and at least one outer surface is recessed relative to the outer edge of the pouch cell 10.

[0110] In the above technical solution, the outer contour area of ​​the support member 30 is smaller than the area of ​​the first outer surface 11 of the soft-pack battery cell 10. When the support member 30 can support the soft-pack battery cell 10, the support member 30 occupies less space in the battery device 100, thereby improving the energy density of the battery device 100.

[0111] Please refer to Figures 3-5. In some embodiments of this application, the support member 30 is combined with the side surface 21 of the heat sink 20. Alternatively, the support member 30 and the heat sink 20 are connected to form a single unit. For example, the support member 30 and the heat sink 20 can be combined through processes such as bonding, fitting, or in-mold injection molding. The side surface 21 of the heat sink 20 forms a surface parallel to the first direction X.

[0112] In the above technical solution, the support 30 is combined with the side 21 of the heat sink 20, which not only allows the support 30 and the heat sink 20 to form an integral whole, making it easier to reduce the number of parts in the battery device 100 assembly process and improve the assembly efficiency of the battery device 100, but also allows the heat sink 20 to maintain a stable position under the connection of the support 30, thereby improving the heat dissipation effect of the heat sink 20 on the soft-pack battery cell 10.

[0113] Referring to Figure 3, in some embodiments of this application, the thickness of the support member 30 is greater than the thickness of the heat sink 20 along the first direction X. Thus, since the support member 30 is disposed at the edge of the heat sink 20, when the thickness of the support member 30 is greater than the thickness of the heat sink 20, at least one side of the support member 30 protrudes from the heat sink 20 along the first direction X and abuts against the pouch cell 10. Therefore, in the above technical solution, the support member 30 ensures that at least one side of the heat sink 20 is spaced apart from the corresponding pouch cell 10, providing space for the expansion and deformation of the pouch cell 10.

[0114] Please refer to Figure 3. In some embodiments of this application, the thickness ratio of the support member 30 to the soft-pack battery cell 10 along the first direction X is less than 10%. For example, the thickness of the support member 30 is D2, the thickness of the soft-pack battery cell 10 is D3, and D2 / D3 < 10%. For example, D2 / D3 can be values ​​such as 1%, 2%, 5%, 6%, 9%, etc.

[0115] In the above technical solution, the thickness ratio of the support member 30 to the soft-pack cell 10 is relatively small, that is, the support member 30 occupies a smaller space, while the soft-pack cell 10 occupies a larger space, which can improve the energy density of the battery device 100.

[0116] In some embodiments of this application, the support member 30 is made of polypropylene. Polypropylene is a type of polymer material polymerized from propylene monomers, mainly including homopolymer polypropylene, copolymer polypropylene, etc.

[0117] In the above technical solution, the support member 30 has good insulation performance, which can improve the stability of the battery device 100. In addition, the support member 30 has relatively stable chemical properties, which can improve the life of the battery device 100.

[0118] In some embodiments of this application, the support member 30 is a deformable elastic member. In other words, the support member 30 can elastically deform when subjected to external force. As mentioned above, the support member 30 can be made of polypropylene-based materials, giving it a certain degree of elasticity.

[0119] In the above technical solution, the support member 30 can deform. During the expansion and deformation process of the soft-pack battery cell 10, the stress of the soft-pack battery cell 10 can be reduced, and the stability of the soft-pack battery cell 10 in use can be improved.

[0120] In one example, when the support member 30 is subjected to a pressure of 0.9 MPa, the support member 30 can be compressed by 80%. Or, when the support member 30 is subjected to 0.9 MPa, the thickness of the support member 30 is 20% of that before being subjected to pressure.

[0121] Referring to Figure 6, in some embodiments of this application, the battery device 100 includes a water-cooled plate 40, and the pouch cell 10 is thermally connected to the water-cooled plate 40. Specifically, the pouch cell 10 can be in direct contact with the water-cooled plate 40 or indirectly connected. The water-cooled plate 40 can be disposed on one side of the pouch cell 10 along the second direction Y. A flowing heat-conducting liquid can be introduced into the interior of the water-cooled plate 40, and the heat-conducting liquid can exchange heat with the pouch cell 10 during the flow, thereby adjusting the temperature of the pouch cell 10. In the above technical solution, the water-cooled plate 40 can cool the pouch cell 10 and reduce the temperature rise of the pouch cell 10.

[0122] Referring to Figure 6, in some embodiments of this application, the pouch cell 10 rests against the water-cooling plate 40 along the second direction Y, and the first direction X intersects the second direction Y. For example, the second direction Y is perpendicular to the first direction X. Under normal use of the battery device 100, the second direction Y can be vertical, and the water-cooling plate 40 can be disposed at the bottom of the pouch cell 10.

[0123] In the above technical solution, the pouch cell 10 rests on the water-cooled plate 40, making the pouch cell 10 and the water-cooled plate 40 relatively close. This can improve the heat exchange efficiency between the pouch cell 10 and the water-cooled plate 40, thereby quickly reducing the temperature rise of the pouch cell 10.

[0124] Referring to Figure 6, in some embodiments of this application, a thermally conductive element 50 is provided between the water-cooled plate 40 and the pouch cell 10, and the thermally conductive element 50 connects the pouch cell 10 and the water-cooled plate 40. Specifically, the thermally conductive element 50 can be a thermally conductive adhesive, such as a thermally conductive silicone gel, epoxy thermally conductive adhesive, or other colloids.

[0125] In the above technical solution, the heat-conducting component 50 can improve the heat exchange efficiency between the water-cooled plate 40 and the soft-pack battery cell 10, which is beneficial for the water-cooled plate 40 to cool down the soft-pack battery cell 10.

[0126] According to some embodiments of this application, optionally, the pouch cell 10 is any one of a lithium iron phosphate battery cell, a ternary battery cell, and a solid-state battery cell.

[0127] Solid-state battery cells can be, but are not limited to, polymer solid-state battery cells, oxide solid-state battery cells, sulfide solid-state battery cells, halide solid-state battery cells, etc. Solid-state battery cells can also be semi-solid-state battery cells or all-solid-state battery cells.

[0128] In the above technical solutions, the use of the aforementioned types of pouch cells 10 provides more options for the design of battery devices to meet different application needs. Specifically, the pouch cell 10 is a lithium iron phosphate battery cell, which has advantages such as high reliability, long cycle life, light weight, large capacity, and low internal resistance; the pouch cell 10 is a ternary lithium battery cell, which has advantages such as high energy density and good electrochemical performance; and the pouch cell 10 is a solid-state battery cell, which has advantages such as high energy density, high reliability, light weight, and good high and low temperature performance.

[0129] According to some embodiments of this application, optionally, the pouch cell 10 is a lithium iron phosphate battery cell, and the ratio of the amount of positive active material, binder and conductive agent in the positive electrode material of the pouch cell 10 is 96:(1-3):(1-3); or the pouch cell 10 is a ternary battery cell, and the ratio of the amount of the amount of positive active material, binder and conductive agent in the positive electrode material of the pouch cell 10 is 96:(2-3):(1-2).

[0130] In some embodiments, the positive electrode of the pouch cell 10 can be a positive electrode sheet, which can include a positive current collector and a positive electrode film layer disposed on at least one surface of the positive current collector, the positive electrode film layer including a positive active material.

[0131] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive electrode film layer is disposed on either or both of the two opposite surfaces of the positive current collector.

[0132] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, titanium, silver-surfaced aluminum, or stainless steel can be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0133] As an example, when the pouch cell 10 of this application embodiment is a lithium-ion battery, the positive electrode active material may include at least one of the following materials: phosphate, layered transition metal oxide, and their respective modified compounds; optionally, the positive electrode active material may include layered transition metal oxide and their respective modified compounds, which is beneficial to improving the energy density of the pouch cell 10. However, this application is not limited to these materials, and other conventional materials that can be used as the positive electrode film layer of a battery may also be used. These positive electrode active materials may be used alone or in combination of two or more.

[0134] Examples of phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites.

[0135] Layered transition metal oxides include those with the general formula Li a Ni b Co c M d O e A f At least one of the compounds and their modified compounds. 0.8 ≤ a ≤ 1.2, 0.3 ≤ b < 1, 0 < c < 1, 0 < d < 1, 1 ≤ e ≤ 2, 0 ≤ f ≤ 1, M includes at least one of Mn, Al, Zr, Zn, Cu, Cr, Mg, Fe, V, Ti, and B, and A includes at least one of N, F, S, and Cl. Optionally, 0.5 ≤ b < 1, and further optionally, 0.75 ≤ b ≤ 0.98.

[0136] Examples of layered transition metal oxides may include, but are not limited to, lithium cobalt oxides (such as LiCoO2), lithium nickel oxides (such as LiNiO2), lithium manganese oxides (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, and lithium nickel cobalt manganese oxides (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM)333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 LiNi 0.9 Co 0.05 Mn 0.05 O2 (also known as Ni90), lithium nickel cobalt aluminum oxide (such as LiNi) 0.80 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0137] When the soft-pack battery cell 10 in this application embodiment is a sodium-ion battery, the positive electrode active material may include, but is not limited to, at least one of sodium-containing transition metal oxides, polyanionic materials (such as phosphates, fluorophosphates, pyrophosphates, sulfates, etc.), and Prussian blue materials.

[0138] As an example, positive electrode active materials for sodium-ion batteries may include NaFeO2, NaCoO2, NaCrO2, NaMnO2, NaNiO2, and NaNi 1 / 2 Ti 1 / 2 O2, NaNi 1 / 2 Mn 1 / 2 O2, Na 2 / 3 Fe 1 / 3 Mn 2 / 3 O2, NaNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2, NaFePO4, NaMnPO4, NaCoPO4, Prussian blue materials, with the general formula X p M' q (PO4) r O x Y 3-x At least one of the materials in general formula X. p M' q (PO4) r O x Y3-x In the given information, 0 < p ≤ 4, 0 < q ≤ 2, 1 ≤ r ≤ 3, 0 ≤ x ≤ 2, X includes at least one of H+, Li+, Na+, K+ and NH4+, M' is a transition metal cation, optionally at least one of V, Ti, Mn, Fe, Co, Ni, Cu and Zn, and Y is a halide anion, optionally at least one of F, Cl and Br.

[0139] In the embodiments of this application, the modified compounds of the above-mentioned positive electrode active materials can be doped and / or surface coated to modify the positive electrode active materials, such as carbon coating modification, fast ion conductor coating modification, etc.

[0140] During the charging and discharging process, the soft-pack battery cell 10 undergoes the insertion and extraction of active ions such as Li, resulting in a different molar content of Li at different discharge states. In the examples of positive electrode active materials in this application, the molar content of Li refers to the initial state of the material, i.e., the state before feeding. When the positive electrode active material is applied to the battery system, the molar content of Li may change after charge-discharge cycles.

[0141] In the examples of positive electrode active materials in this application, the molar content of oxygen (O) is only a theoretical value. Oxygen release from the crystal lattice will cause the molar content of oxygen (O) to change. In reality, the molar content of oxygen (O) will fluctuate.

[0142] In this embodiment, the elemental content in the positive electrode active material is defined in a way known in the art and can be detected using equipment and methods known in the art. For example, referring to EPA 6010D-2014, it can be measured by inductively coupled plasma atomic emission spectrometry (ICP-OES, instrument model: Thermo ICAP7400). First, 0.4g of the positive electrode active material is weighed and 10ml (50% concentration) of aqua regia is added. Then, it is placed on a plate at 180℃ for 30min. After digestion on the plate, the volume is adjusted to 100mL, and quantitative testing is performed using the standard curve method.

[0143] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the positive electrode, a positive electrode film layer may or may not be provided on the surface of the foamed metal. As an example, lithium source material, potassium metal, or sodium metal may also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0144] In some embodiments, the positive electrode film layer may optionally include a positive electrode conductive agent. This application embodiment does not particularly limit the type of positive electrode conductive agent. As an example, the positive electrode conductive agent includes at least one selected from superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers. In some embodiments, the mass percentage of the positive electrode conductive agent in the positive electrode film layer is ≤5 wt%.

[0145] In some embodiments, the positive electrode film layer may optionally include a positive electrode binder. This application embodiment does not impose any particular limitation on the type of positive electrode binder. As an example, the positive electrode binder may include at least one selected from polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), PVDF-tetrafluoroethylene-propylene terpolymer, PVDF-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer, and fluorinated acrylate resins. In some embodiments, the mass percentage of the positive electrode binder in the positive electrode film layer is ≤5 wt%.

[0146] The positive electrode film is typically formed by coating a positive electrode slurry onto a positive electrode current collector, followed by drying and cold pressing. The positive electrode slurry is usually formed by dispersing the positive electrode active material, optional conductive agent, optional binder, and any other components in a solvent and stirring until homogeneous. The solvent can be N-methylpyrrolidone (NMP), but is not limited to it.

[0147] In some embodiments, the negative electrode may be a negative electrode sheet, which may include a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector, the negative electrode film layer including a negative electrode active material.

[0148] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode film layer is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0149] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0150] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in pouch cells 10. As an example, the negative electrode active material may include at least one of the following materials: carbon materials (e.g., carbon materials include at least one of artificial graphite, natural graphite, soft carbon, and hard carbon), silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may include at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may include at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode films in batteries may also be used. These negative electrode films may be used alone or in combination of two or more.

[0151] In some embodiments, the negative electrode active material includes silicon, which may exist in the form of a silicon-based material, such as elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The introduction of silicon can improve the energy density of the pouch cell 10.

[0152] In some embodiments, the mass content of silicon in the negative electrode film layer is from 1 wt% to 32 wt%, optionally from 2 wt% to 19 wt%, and further optionally from 6 wt% to 13 wt%. In the pouch cell 10 system, when the mass content of silicon is within the above range, the energy density of the pouch cell 10 can be improved.

[0153] In the embodiments of this application, the mass content of silicon in the negative electrode film layer has a meaning known in the art and can be detected using equipment and methods known in the art. For example, the negative electrode sheet can be immersed in a solvent such as water to separate the negative electrode active material from the negative electrode current collector, and the negative electrode active material can be obtained by filtration. The silicon content of the negative electrode active material can be obtained by using an ICAP7400 inductively coupled plasma atomic emission spectrometer from Thermo Fisher Scientific, USA, in accordance with the GB / T30902-2014 standard.

[0154] In some embodiments, the negative electrode film layer may optionally include a negative electrode conductive agent. This application embodiment does not particularly limit the type of negative electrode conductive agent. As an example, the negative electrode conductive agent may include at least one selected from superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers. In some embodiments, the mass percentage of the negative electrode conductive agent in the negative electrode film layer is ≤5 wt%.

[0155] In some embodiments, the negative electrode film layer may optionally include a negative electrode binder. This application embodiment does not impose any particular limitation on the type of negative electrode binder. As an example, the negative electrode binder may include at least one of styrene-butadiene rubber (SBR), water-soluble unsaturated resin SR-1B, waterborne acrylic resins (e.g., polyacrylic acid PAA, polymethacrylic acid PMAA, sodium polyacrylate PAAS), polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium alginate (SA), and carboxymethyl chitosan (CMCS). In some embodiments, the mass percentage of the negative electrode binder in the negative electrode film layer is ≤5%.

[0156] In some embodiments, the negative electrode film may optionally include other additives. As an example, other additives may include thickeners, such as sodium carboxymethyl cellulose (CMC-Na), PTC thermistor materials, etc. In some embodiments, the mass percentage of other additives in the negative electrode film is ≤2 wt%.

[0157] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0158] In some embodiments, the separator includes a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0159] This application does not impose any particular restrictions on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0160] In some embodiments, the material of the separator may include one or more of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer may be the same or different, without particular limitation.

[0161] In some embodiments, the separator may include a porous base membrane and a coating disposed on at least one side of the porous base membrane, the coating including at least one of inorganic particles or organic particles.

[0162] Porous base membranes may include one or more of polyethylene and polypropylene.

[0163] Inorganic particles possess good heat resistance, which can improve the overall heat resistance of the separator. Within the operating voltage range of sodium-ion batteries, inorganic particles essentially do not undergo oxidation and reduction reactions with metal dendrites. In other words, inorganic particles are configured to prevent oxidation and reduction reactions with alkali metals and / or alkaline earth metals at the nominal voltage of sodium-ion batteries.

[0164] In some embodiments, the inorganic particles include one or more of boehmite γ-AlOOH, aluminum oxide Al2O3, aluminum hydroxide Al(OH)3, barium sulfate BaSO4, magnesium oxide MgO, magnesium hydroxide Mg(OH)2, calcium oxide CaO, cerium oxide CeO2, zirconium titanate SrTiO3, barium titanate BaTiO3, and magnesium fluoride MgF2.

[0165] In some embodiments, the organic particles include at least one of polystyrene, polyethylene, polyimide, melamine resin, phenolic resin, polypropylene, polyester (e.g., polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate), polyphenylene sulfide, polyarylamide, polyamide-imide, polyimide, copolymers of butyl acrylate and ethyl methacrylate, and mixtures thereof.

[0166] In some embodiments, the pouch cell 10 further includes an electrolyte.

[0167] During the charging and discharging process of a single battery cell, active ions repeatedly insert and extract between the positive and negative electrode plates, while the electrolyte acts as a conductor for these active ions. This application does not impose any particular restrictions on the type of electrolyte; it can be selected according to actual needs.

[0168] Electrolytes consist of electrolyte salts and solvents. The types of electrolyte salts and solvents are not specifically limited and can be selected according to actual needs.

[0169] In some embodiments, the electrolyte may optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain battery performance, such as additives that improve battery overcharge performance, additives that improve battery high-temperature performance, and additives that improve battery low-temperature power performance.

[0170] For example, the additives include at least one of the following: cyclic carbonate compounds containing unsaturated bonds, sulfate compounds, sulfite compounds, sulfonyl lactone compounds, disulfonic acid compounds, nitrile compounds, aromatic compounds, isocyanate compounds, phosphonitrile compounds, acid anhydrides, cyclic acid anhydride compounds, phosphite compounds, phosphate compounds, borate esters, and carboxylic acid esters.

[0171] It is understandable that when the pouch cell 10 is a lithium iron phosphate battery cell, the positive electrode active material accounts for 96 parts of the total weight of the positive electrode material, the binder accounts for 1 to 3 parts of the total weight of the positive electrode material (for example, including but not limited to 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, etc.), and the conductive agent accounts for 1 to 3 parts of the total weight of the positive electrode material (for example, including but not limited to 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, etc.).

[0172] For example, when the soft-pack battery cell 10 is a lithium iron phosphate battery cell, the positive electrode active material is LFP (which can refer to LiFePO4, i.e., lithium iron phosphate), the binder can be PVDF (polyvinylidene fluoride), and the conductive agent can be conductive carbon black. The ratio of LFP:PVDF:conductive carbon black can be 96:2:2, meaning that the total weight of the positive electrode active material is divided into 100 parts, with LFP accounting for 96 parts, PVDF accounting for 2 parts, and conductive carbon black also accounting for 2 parts. The weight unit of the positive electrode active material can be grams.

[0173] When the pouch cell 10 is a ternary lithium battery cell, in the positive electrode material of the pouch cell 10, the positive electrode active material accounts for 96 parts of the total weight of the positive electrode material, the binder accounts for 2 to 3 parts of the total weight of the positive electrode material (for example, including but not limited to 2, 2.2, 2.5, 2.8, 3, etc.), and the conductive agent accounts for 1 to 2 parts of the total weight of the positive electrode material (for example, including but not limited to 1, 1.2, 1.5, 1.8, 2, etc.). The ternary lithium battery cell can be, but is not limited to, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, etc.

[0174] For example, the ternary material of the ternary battery cell can be an octet LiNi. 0.8 Co 0.1 Mn 0.1 The weight ratio of O2, positive electrode active material, binder, and conductive agent is 96:2.5:1.5, meaning the total weight of the positive electrode material is divided into 100 parts. (This refers to the octet LiNi...) 0.8 Co 0.1 Mn 0.1 The composition of O2 is 96 parts, the composition of adhesive is 2.5 parts, and the composition of conductive agent is 1.5 parts.

[0175] In the above technical solutions, when the pouch cell 10 is a lithium iron phosphate battery cell, a high proportion of positive electrode active material means that more substances capable of electrochemical reactions can be accommodated within a limited electrode assembly. This is beneficial for increasing the capacity and energy density of the battery device 100, enabling the lithium iron phosphate battery cell to output higher power while maintaining a relatively small volume and weight, meeting the application scenarios with certain energy density requirements. Using the above-mentioned range for the amount of binder and conductive agent can reduce the cost of auxiliary materials, thereby reducing the overall cost of the battery device 100. When the pouch cell 10 is a ternary battery cell, due to the relatively complex structure and surface properties of ternary materials, using the above-mentioned proportions of positive electrode active material, binder, and conductive agent helps to ensure good adhesion between positive electrode active material particles and between the active material and the current collector, thereby improving the mechanical stability and integrity of the electrode assembly. This helps to reduce the risk of active material detachment and electrode pulverization during charging and discharging, and extends the cycle life of the battery device 100.

[0176] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, wherein, The battery device includes: Multiple pouch cells, wherein the multiple pouch cells are arranged along a first direction; and A heat sink is disposed between two adjacent pouch cells.

2. The battery device according to claim 1, wherein, The pouch cell includes a first outer surface, which is the largest surface of the pouch cell. The first outer surfaces of multiple pouch cells are arranged along the first direction, and the heat sink is disposed between the first outer surfaces of two adjacent pouch cells.

3. The battery device according to claim 2, wherein, The projection of the heat sink in the first direction lies within the first outer surface of the pouch cell.

4. The battery device according to claim 2 or 3, wherein, The surface of the heat sink facing the pouch cell is flat.

5. The battery device according to any one of claims 1-4, wherein, The heat sink is spaced apart from the pouch cell.

6. The battery device according to any one of claims 1-5, wherein, The heat sink is a solid structural component.

7. The battery device according to any one of claims 1-6, wherein, The heat sink is a plate-shaped component of uniform thickness, and the thickness direction of the heat sink is the same as the first direction.

8. The battery device according to any one of claims 1-7, wherein, The heat sink is a metal component.

9. The battery device according to any one of claims 1-8, wherein, The thickness of the heat sink is D1, where 0.2mm ≤ D1 ≤ 2mm.

10. The battery device according to any one of claims 1-9, wherein, The battery device includes a support member disposed at the edge of the heat sink and abutting against the pouch cell.

11. The battery device according to claim 10, wherein, The support surrounds the heat sink.

12. The battery device according to claim 11, wherein, The pouch cell includes a first outer surface, which is the largest surface of the pouch cell. The first outer surface of the pouch cell is arranged along the first direction. The heat sink is disposed between the first outer surfaces of two adjacent pouch cells. The outer contour area of ​​the support is smaller than the area of ​​the first outer surface of the pouch cell.

13. The battery device according to any one of claims 10-12, wherein, The support member is attached to the side of the heat sink.

14. The battery device according to any one of claims 10-13, wherein, Along the first direction, the thickness of the support member is greater than the thickness of the heat dissipation member.

15. The battery device according to any one of claims 10-14, wherein, Along the first direction, the thickness ratio of the support member to the thickness of the pouch cell is less than 10%.

16. The battery device according to any one of claims 10-15, wherein, The support is made of polypropylene.

17. The battery device according to any one of claims 10-16, wherein, The support member is a deformable elastic element.

18. The battery device according to any one of claims 1-17, wherein, The battery device includes a water-cooled plate, and the pouch cell is thermally connected to the water-cooled plate.

19. The battery device according to claim 18, wherein, The pouch cell rests against the water-cooled plate along the second direction, where the first direction intersects the second direction.

20. The battery device according to claim 19, wherein, A heat-conducting component is provided between the water-cooled plate and the pouch cell, and the heat-conducting component connects the pouch cell and the water-cooled plate.

21. The battery device according to any one of claims 1-20, wherein, The pouch cell is any one of lithium iron phosphate battery cell, ternary battery cell, and solid-state battery cell.

22. The battery device according to any one of claims 1-20, wherein, The pouch cell is a lithium iron phosphate battery cell, and the ratio of the positive electrode active material, binder, and conductive agent in the positive electrode material of the pouch cell is 96:(1-3):(1-3); and / or, the pouch cell is a ternary battery cell, and the ratio of the positive electrode active material, binder, and conductive agent in the positive electrode material of the pouch cell is 96:(2-3):(1-2).

23. An electrical appliance, wherein, The electrical equipment includes the battery device according to any one of claims 1-22.

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