Battery cell, battery pack, and power consuming device

Abstract

This application relates to the field of battery technology, specifically to a battery cell, a battery pack, and an electrical device. The disclosed battery cell includes: a housing, a wetting element, and an electrode assembly; the wetting element is disposed within the housing; the electrode assembly is at least partially disposed within the wetting element; the wetting element includes an end plate, one side of which is attached to the inner wall of the housing along the length and / or width direction, and the other side of which is attached to at least a portion of the electrode assembly; a first flow channel is provided in the end plate along the height direction of the housing; a second flow channel is also provided on the end plate, one end of which communicates with the first flow channel. The battery cell of this application enables the electrode assembly within the cell to be uniformly wetted with electrolyte, preventing a portion of the electrode assembly from failing to effectively contact the electrolyte due to gravity and electrolyte consumption during charging and discharging, thus avoiding a decrease in the cell's dynamic performance and affecting its cycle performance and safety performance.

Description

Technical Field

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

[0002] As the requirements for battery capacity continue to increase, the size of battery cells is also getting larger, and the time for the electrolyte to soak into the electrode assembly after filling the cell is also getting longer. However, due to gravity, the electrolyte usually concentrates at the end of the cell closest to the ground, resulting in uneven wetting of the cell, which can easily lead to cell cycle failure. Utility Model Content

[0003] In view of this, this application aims to at least partially solve one of the technical problems in the related art. To this end, this application provides a battery cell, a battery pack, and an electrical device that can uniformly wet the electrode assembly in the battery cell with electrolyte, preventing a portion of the electrode assembly from failing to effectively contact the electrolyte due to gravity and electrolyte consumption during charging and discharging, thereby reducing the dynamic performance of the battery cell and affecting its cycle performance and safety performance.

[0004] To solve the above-mentioned technical problems, this application is implemented as follows:

[0005] According to one aspect of this application, this application provides a battery cell, comprising:

[0006] case;

[0007] The immersion element is disposed within the housing;

[0008] The electrode assembly is at least partially disposed in the immersion member;

[0009] The immersion member includes an end plate, one side of which is abutted against the inner wall of the housing in the length and / or width direction of the housing, and the other side of which is abutted against at least a portion of the electrode assembly;

[0010] Along the height direction of the housing, a first flow channel is provided in the end plate; a second flow channel is also provided on the end plate, and one end of the second flow channel is connected to the first flow channel.

[0011] In one optional implementation, the thickness of the end plate is 0.5 mm to 2 mm.

[0012] In one alternative implementation, the length of the first guide channel is greater than or equal to the length of the end plate in the height direction of the housing.

[0013] In one optional embodiment, in the width direction of the housing, the width of the end plate is smaller than the width of the housing, and the width difference between the end plate and the housing is 0.1 mm to 0.5 mm.

[0014] In one alternative embodiment, the immersion member further includes a base plate located between the bottom wall of the electrode assembly and the bottom wall of the housing;

[0015] A third flow channel is provided on the bottom plate in the height direction of the housing.

[0016] In one alternative implementation, the thickness of the base plate is 0.5 mm to 2 mm.

[0017] In one alternative implementation, the length of the third flow channel is greater than or equal to the thickness of the base plate in the height direction of the housing.

[0018] In one alternative implementation, the bottom plate and the end plate sidewall near the bottom wall of the housing are connected in the length and / or width direction of the housing.

[0019] According to a second aspect of this application, this application also provides a battery pack, including: the battery cell described in any embodiment of one aspect of this application.

[0020] According to a third aspect of this application, this application also provides an electrical device, comprising: a battery cell as described in any embodiment of one aspect of this application, or a battery pack as described in any embodiment of the second aspect of this application.

[0021] The technical solution of this application has at least the following beneficial effects:

[0022] 1. In this application, by providing a wetting element in the battery cell, the wetting element is disposed in the housing, and at least part of the electrode assembly is disposed in the wetting element; and the wetting element includes an end plate, one side of the end plate is attached to the inner sidewall of the housing in the length and / or width direction of the housing, and the other side of the end plate is attached to at least part of the electrode assembly, and a first guide channel and a second guide channel are respectively provided on the end plate; this enables the electrode assembly in the battery cell to be uniformly wetted with electrolyte, and will not cause a part of the electrode assembly to fail to effectively contact the electrolyte due to gravity and electrolyte consumption during charging and discharging, thereby reducing the dynamic performance of the battery cell and affecting the cycle performance and safety performance of the battery cell.

[0023] 2. In a preferred embodiment of this application, the immersion member further includes a base plate, an end plate, and a base plate that are adapted to the housing. The electrode assembly is installed in the immersion member, which can effectively deliver the electrolyte to all positions of the electrode assembly, so that the entire electrode assembly is uniformly immersed in the electrolyte, thereby improving the cycle performance and capacity of the battery cell. At the same time, the immersion member can also protect the electrode assembly from damage, preventing damage to the electrode assembly when the battery cell is collided. It can also provide a certain degree of support for the electrode assembly, making it stable and preventing the electrode assembly from moving around in the housing, thereby improving the safety performance of the battery cell.

[0024] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0026] Figure 1 The diagram shown is a schematic diagram of the battery cell structure provided in this application;

[0027] Figure 2 The diagram shown is a front view of the end plate structure provided in this application;

[0028] Figure 3 The diagram shown is a side view of the end plate structure provided in this application. Figure 1 ;

[0029] Figure 4 The diagram shown is a side view of the end plate structure provided in this application. Figure 2 ;

[0030] Figure 5 The diagram shown is a schematic of the base plate structure provided in this application. Figure 1 ;

[0031] Figure 6 The diagram shown is a schematic of the base plate structure provided in this application. Figure 2 .

[0032] Explanation of reference numerals in the attached figures:

[0033] 100 — Battery cell;

[0034] 110 – Housing; 120 – Electrode assembly; 130 – Cover plate; 140 – Wetting element;

[0035] 141—End plate; 142—First guide channel; 143—Second guide channel; 144—Bottom plate; 145—Third guide channel.

[0036] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0037] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0038] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges or individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0039] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0040] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0041] Currently, the demand for high-capacity batteries is gradually increasing. To improve battery capacity, larger-sized cells are usually designed. However, after injecting electrolyte into large-sized cells, the immersion time of the electrode assembly is generally extended to ensure sufficient wetting of the electrolyte. Research has found that after injecting electrolyte into large-sized cells, due to gravity, the electrolyte quickly flows towards and concentrates at the end of the cell closest to the ground. This ensures that the end of the electrode assembly closest to the ground is fully wetting, while the end furthest from the ground may not be sufficiently wetting, resulting in uneven electrolyte wetting of the electrode assembly within the cell. Insufficient wetting of the electrode assembly reduces the contact area between the positive and negative electrode active materials and the electrolyte, increasing the lithium-ion transport path. Consequently, the impedance during lithium-ion insertion and extraction increases, reducing the cell's kinetic performance. Furthermore, insufficient wetting also hinders the formation of a uniform solid-liquid interface, leading to incomplete or unstable SEI film formation, further increasing interfacial impedance and reducing charge-discharge efficiency. In addition, even if the electrode assembly can be uniformly wetted with electrolyte after the cell is filled with electrolyte, the viscosity of the electrolyte containing additives will increase during subsequent charging and discharging processes, and the electrolyte will concentrate at the end of the cell closest to the ground, resulting in uneven electrolyte distribution, which may lead to cell cycle failure.

[0042] In view of the technical problems existing in the prior art, this application provides a battery cell, a battery pack, and an electrical device. By setting an impregnation element between the battery cell casing and the electrode assembly, and setting a flow guiding channel in the end plate of the impregnation element, a capillary effect can be formed to transport the electrolyte to the end of the battery cell away from the ground. This can avoid uneven distribution of electrolyte during the filling or cycling process of the battery cell, which would prevent the electrode assembly from being effectively impregnated with electrolyte and affect the overall performance of the battery cell.

[0043] In some embodiments of this application, a battery cell is provided, including: a housing 110, a wetting member 140, and an electrode assembly 120; the wetting member 140 is disposed within the housing 110; the electrode assembly 120 is at least partially disposed within the wetting member 140; the wetting member 140 includes an end plate 141, one side of the end plate 141 is attached to the inner wall of the housing 110 in the length and / or width direction, and the other side of the end plate 141 is attached to at least a portion of the electrode assembly 120; a first flow channel 142 is provided in the end plate 141 along the height direction of the housing 110; a second flow channel 143 is also provided on the end plate 141, one end of the second flow channel 143 communicating with the first flow channel 142.

[0044] refer to Figure 1The housing 110 can be made of metal materials such as aluminum foil, copper foil, or aluminum alloy. The housing 110 can be made into a cube or cylinder. One end of the housing 110 is open, allowing the electrode assembly 120 to be placed and installed inside the housing 110. The impregnating element 140 is made of an insulating material. For example, the impregnating element 140 can be made of materials such as nitrile rubber, neoprene rubber, polyurethane elastomer, epoxy resin, polyimide, or polyolefin. In a preferred embodiment, the shape of the immersion member 140 can be adapted to the housing 110, thereby ensuring that the assembly and manufacturing of the battery cell is more convenient and efficient. For example, the immersion member 140 can be configured to fit the housing 110, having a certain accommodating space. When the immersion member 140 is placed in the housing 110, the outer sidewall of the immersion member 140 is in contact with the inner sidewall of the housing 110. The electrode assembly 120 can be placed in the accommodating space of the immersion member 140. The cover plate assembly in the battery cell is placed at the open end of the housing 110 and is fixedly connected to the housing 110 by welding, bonding, or other methods. The electrode tabs on the electrode assembly 120 can be connected to the electrode posts. Furthermore, the inner sidewall of the immersion member 140 is in contact with the electrode assembly 120. The battery cell also includes a cover plate 130, which is made of metal and is placed at the open end of the housing 110. It is understood that the cover plate 130 also has an explosion-proof valve, a liquid injection hole, and electrode posts.

[0045] Continue to refer to Figure 2 and Figure 3The wetting element 140 can be composed of one, two, three, or four or more end plates 141; in the length and / or width direction of the housing 110, one side of the end plate 141 is attached to the inner wall of the housing 110, and the other side of the end plate 141 is attached to at least a portion of the electrode assembly 120. A first guide channel 142 is provided in the end plate 141 along the height direction of the housing 110. Those skilled in the art will understand that one, two, three or more first guide channels 142 can be provided in the end plate 141; thus, the first guide channel 142 can generate a capillary effect, directing the flow of fluids from the end plate 141 into the housing 110. The electrolyte at the bottom of the casing 110 is transported to the top of the casing 110. When the cell is placed, the end of the cell furthest from the cover assembly is in contact with the ground. The electrolyte in the cell may be partially concentrated at this end. During charging and discharging, the end of the cell closest to the cover assembly may lack electrolyte. The first guide channel 142 on the end plate 141 can transport the electrolyte from the end of the cell furthest from the cover assembly to the end closest to the cover assembly, thus ensuring that the entire electrode assembly 120 in the cell is uniformly immersed in the electrolyte, guaranteeing good dynamic performance, cycle performance, and safety performance of the cell. Furthermore, compared to the prior art that uses sponges or similar materials to wet the electrode assembly, the two sides of the end plate 141 in this application are respectively attached to the inner walls of the electrode assembly 120 and the casing 110, providing support and stability for the electrode assembly 120, preventing it from shifting and affecting the safety performance of the cell.

[0046] Continue to refer to Figure 2 One end of the second flow channel 143 is connected to the first flow channel 142. It can be understood that the second flow channel 143 can be perpendicular to the first flow channel 142 or not perpendicular to it. That is, the second flow channel 143 and the first flow channel 142 can form any acute or obtuse angle. At least one second flow channel 143 is provided on each first flow channel 142. In a preferred embodiment, multiple second flow channels 143 are uniformly provided on each first flow channel 142. In this way, when the first flow channel 142 transports the electrolyte from one end of the battery cell to the other end of the battery cell, the second flow channel 143 can also transport the electrolyte to various parts of the electrode assembly 120, thereby ensuring that the electrode assembly 120 in the battery cell can be uniformly wetted with electrolyte, and thus giving the battery cell better cycle performance. It is understood that in some embodiments of this application, the first guide channel 142 may be perpendicular to the bottom end of the housing 110 or may not be perpendicular to the bottom end of the housing 110. Those skilled in the art can make adjustments based on the actual situation and on the basis of this application.

[0047] This application provides a battery cell in which a wetting element is disposed within a housing, and at least a portion of the electrode assembly is disposed within the wetting element. The wetting element includes an end plate, one side of which is attached to the inner wall of the housing along the length and / or width direction, and the other side of which is attached to at least a portion of the electrode assembly. A first flow channel is provided in the end plate along the height direction of the housing. A second flow channel is also provided on the end plate, one end of which is connected to the first flow channel. The battery cell of this application enables the electrode assembly in the battery cell to be uniformly wetted with electrolyte, preventing a portion of the electrode assembly from failing to effectively contact the electrolyte due to gravity and electrolyte consumption during charging and discharging, thus avoiding a decrease in the dynamic performance of the battery cell and affecting its cycle performance and safety performance.

[0048] In some embodiments, the thickness of the end plate 141 is 0.5 mm to 2 mm.

[0049] refer to Figure 2 It is understood that the thickness of the end plate 141 can be any one of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.2mm, 1.5mm, 1.8mm, or 2.0mm, or any value between any two. By limiting the thickness of the end plate 141, it can be ensured that the wetting member 140, including the end plate 141, can evenly distribute the electrolyte to the entire cell, so that all parts of the electrode assembly 120 can be effectively immersed in the electrolyte for a long time. At the same time, it can also enable the cell to have a high capacity. If the end plate 141 If the thickness of the end plate 141 is greater than the above range, it may encroach on the internal space of the cell, making the size of the electrode assembly smaller and thus affecting the capacity of the cell. If the thickness of the end plate 141 is less than the above range, the viscosity of the electrolyte will gradually increase with the continuous charging and discharging process. If the thickness of the end plate 141 is too small, the aperture of the second and first flow channels may become smaller, making it difficult to transport electrolyte with excessive viscosity. That is, in electrolyte with excessive viscosity, it is difficult to form a capillary effect, which may cause a part of the electrode assembly to be unable to effectively contact the electrolyte, thus affecting the overall performance of the cell.

[0050] In some embodiments, the length of the first flow channel 142 is greater than or equal to the length of the end plate 141 in the height direction of the housing 110.

[0051] refer to Figure 2 and Figure 4In the height direction of the housing 110, the length of the first flow channel 142 can be equal to the length of the end plate 141, that is, in the height direction of the housing 110, the edge of the first flow channel 142 is parallel to the edge of the end plate 141; of course, the length of the first flow channel 142 can also be greater than the length of the end plate 141, that is, in the height direction of the housing 110, the edge of the first flow channel 142 is not parallel to the edge of the end plate 141; that is, the first flow channel 142 can connect any two ends inside the cell, and can transport the electrolyte from one end inside the cell to the other end inside the cell. Under the influence of gravity, the electrolyte will concentrate at the end of the cell closer to the ground. This ensures that the first flow channel 142 can transport the electrolyte to the end of the cell with less electrolyte, thereby making the electrolyte evenly distributed throughout the cell.

[0052] In some embodiments, in the width direction of the housing 110, the width of the end plate 141 is less than the width of the housing 110, and the width difference between the end plate 141 and the housing 110 is 0.1 mm to 0.5 mm.

[0053] refer to Figure 1 In the width direction of the housing 110, the width of the end plate 141 is less than the width of the housing 110, and the difference in width between the end plate 141 and the housing 110 can be any one of 0.1mm, 0.2mm, 0.3mm, 0.4mm or 0.5mm or any point value between any two. By limiting the width of the end plate 141, it can be ensured that the wetting member 140 including the end plate 141 can deliver the electrolyte to various positions in the cell through the capillary effect, so that the electrode group 120 and the electrolyte can be in full contact. At the same time, it can also provide a larger capacity for the cell, allowing for the installation of a larger electrode group, thus giving the cell a higher capacity. If the width of the end plate 141 is greater than or equal to that of the housing 110, the wetting member 140 may not be able to be installed in the housing 110. If the width of the end plate 141 is too small, it may affect the size of the electrode group 120, thus wasting the internal space of the housing 110 and reducing the capacity of the cell. In addition, by limiting the width of the end plate 141 and the width of the housing 110, the housing 110 can be guaranteed to have a suitable thickness to a certain extent, so that the housing 110 has excellent mechanical strength. If the thickness of the housing 110 is too thin, the battery cell may be easily damaged when it is hit. The housing 110 does not have enough strength to protect the internal components such as the electrode group of the battery cell. If the thickness of the housing 110 is too thick, it will waste raw materials and increase the manufacturing cost.

[0054] In some embodiments, the immersion member 140 further includes a base plate 144, which is located between the bottom wall of the electrode assembly 120 and the bottom wall of the housing 110; a third flow channel 145 is provided on the base plate 144 in the height direction of the housing 110.

[0055] refer to Figure 1 and Figure 5 The base plate 144 is disposed between the bottom end of the electrode group 120 and the housing 110. The base plate 144 can be fixedly connected to the end plate 141 by welding, bonding or other means, or it can be detachably connected by pins or snap-fits. Alternatively, one end of the base plate 144 may or may not be in contact with one end of the end plate 141. Along the height direction of the housing 110, the base plate 144 is also provided with a third flow channel 145. The third flow channel 145 can transport the electrolyte from one side of the base plate 144 to the other side through the capillary effect.

[0056] In some embodiments, the thickness of the base plate 144 is 0.5 mm to 2 mm.

[0057] refer to Figure 1 It is understandable that the thickness of the base plate 144 can be any one of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.2mm, 1.5mm, 1.8mm, or 2.0mm, or any value between any two. By limiting the thickness of the base plate 144, a larger internal space can be ensured within the cell, resulting in a larger electrode assembly 120 and thus a higher capacity. If the thickness of the base plate 144 is too large, it may encroach on the internal space of the cell, thereby affecting the capacity of the cell. If the thickness of the base plate 144 is too thin, the length of the third flow channel 145 may be too small, making it difficult to form an effective capillary effect and difficult to transport electrolyte with excessive viscosity.

[0058] In some embodiments, the length of the third flow channel 145 is greater than or equal to the thickness of the base plate 144 in the height direction of the housing 110.

[0059] refer to Figure 5 and Figure 6 Similarly, it can be understood that in the thickness direction of the base plate 144, the length of the third flow channel 145 is equal to or greater than the thickness of the base plate 144. That is, the third flow channel 145 can be perpendicular to the bottom end of the housing 110, or the third flow channel 145 can be non-perpendicular to the bottom end of the housing 110. The third flow channel 145 can transport the electrolyte from one side of the base plate 144 to the other side. In a preferred embodiment, the base plate 144 is provided with a plurality of uniform third flow channels 145, which can transport the electrolyte from the bottom end of the cell to the bottom end of the electrode group 120, so that the electrode group 120 can be effectively wetted with electrolyte and ensure the overall performance of the cell.

[0060] In some embodiments, the bottom plate 144 and the sidewall of the end plate 141 near the bottom wall of the housing 110 are connected in the length and / or width direction of the housing 110.

[0061] refer to Figure 1 It is understood that, in the preferred embodiment, the immersion member 140 includes a base plate 144 and a plurality of end plates 141, wherein the base plate 144 is connected to the side wall of the end plate 141 near the bottom wall of the housing 110. In this way, the base plate 144 can prevent the first flow channel 142 in the end plate 141 from being blocked, thereby enabling the first flow channel 142 to play the role of conveying electrolyte. At the same time, the base plate 144 and the plurality of end plates 141 form a housing with a accommodating space that is adapted to the housing 110, which makes the battery cell installation convenient and quick, stabilizes the electrode group, and makes the electrode group less prone to movement.

[0062] It is understood that, according to this application, the end plate 141 and / or the base plate 144 are made of polyolefin, such as polyethylene, polypropylene, or polyvinylidene fluoride. The end plate 141 and the base plate 144 made of polyolefin can not only transport electrolyte and make the electrode group uniformly contact the electrolyte, but also protect the electrode group 120. Since the end plate 141 and / or the base plate 144 made of the above materials have good elastic properties, when the cell is hit, the end plate 141 and / or the base plate 144 can effectively protect the electrode group from damage, thereby making the cell have higher safety performance.

[0063] In some embodiments of this application, a battery pack is also provided, including the battery cells described in any of the above embodiments.

[0064] Understandably, the battery pack also includes a housing, in which multiple series or parallel battery cells are installed. The battery pack also includes a battery swapping device, electrical components, battery swapping cooling plugs, or battery swapping high and low voltage plugs, etc.

[0065] In some embodiments of this application, an electrical device is also provided, including: the battery cell in any of the above embodiments.

[0066] In some embodiments, the electrical device further includes the battery pack described in any of the above embodiments.

[0067] It is understood that electrical equipment includes, but is not limited to, vehicles such as electric cars, electric motorcycles or electric bicycles, or electric storage cabinets.

[0068] In the above embodiments, the descriptions of each embodiment have their own emphasis. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0069] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0070] It should be noted that the terms "and / or" or " / " used herein are merely descriptions 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. The singular forms "a," "the," and "the" used in the embodiments of this application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0071] In the detailed description and claims, a list of items connected by the terms "at least one of," "at least one of," "at least one of," or other similar terms may mean any combination of the listed items. For example, if items A and B are listed, then the phrase "at least one of A and B" means only A; only B; or A and B. In another example, if items A, B, and C are listed, then the phrase "at least one of A, B, and C" means only A; or only B; only C; A and B (excluding C); A and C (excluding B); B and C (excluding A); or all of A, B, and C. Item A may contain a single element or multiple elements. Item B may contain a single element or multiple elements. Item C may contain a single element or multiple elements.

[0072] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A battery cell, characterized in that, include: Shell (110); An immersion member (140) is disposed within the housing (110); The electrode assembly (120) is at least partially disposed in the immersion member (140); The immersion member (140) includes an end plate (141) in the length and / or width direction of the housing (110), one side of the end plate (141) is attached to the inner wall of the housing (110), and the other side of the end plate (141) is attached to at least a portion of the electrode assembly (120); Along the height direction of the housing (110), a first flow channel (142) is provided in the end plate (141); a second flow channel (143) is also provided on the end plate (141), one end of the second flow channel (143) being connected to the first flow channel (142).

2. The battery cell according to claim 1, characterized in that, The thickness of the end plate (141) is 0.5 mm to 2 mm.

3. The battery cell according to claim 1, characterized in that, The length of the first flow channel (142) is greater than or equal to the length of the end plate (141) in the height direction of the housing (110).

4. The battery cell according to claim 1, characterized in that, In the width direction of the housing (110), the width of the end plate (141) is smaller than the width of the housing (110), and the width difference between the end plate (141) and the housing (110) is 0.1mm to 0.5mm.

5. The battery cell according to claim 1, characterized in that, The immersion member (140) further includes a base plate (144) located between the bottom wall of the electrode assembly (120) and the bottom wall of the housing (110); A third flow channel (145) is provided on the bottom plate (144) in the height direction of the housing (110).

6. The battery cell according to claim 5, characterized in that, The thickness of the base plate (144) is 0.5mm to 2mm.

7. The battery cell according to claim 5, characterized in that, The length of the third flow channel (145) is greater than or equal to the thickness of the base plate (144) in the height direction of the housing (110).

8. The battery cell according to claim 5, characterized in that, In the length and / or width direction of the housing (110), the bottom plate (144) is connected to the side wall of the end plate (141) near the bottom wall of the housing (110).

9. A battery pack, characterized in that, include: The battery cell according to any one of claims 1 to 8.

10. An electrical appliance, characterized in that, include: The battery cell according to any one of claims 1 to 8, or the battery pack according to claim 9.

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