Battery cell and electric device

Abstract

The application relates to the technical field of battery manufacturing, in particular to a battery cell and an electric device. The battery cell comprises a cover plate and a shell. The cover plate comprises a cover plate body and a first plastic part, and the first plastic part is connected with one side of the cover plate body. The cover plate body is provided with a liquid injection hole penetrating through the cover plate body along a thickness direction. The first plastic part comprises a liquid injection part corresponding to the liquid injection hole, and the liquid injection part is provided with a flow guide through hole penetrating through the liquid injection part along the thickness direction. The flow guide through hole is aligned and communicated with the liquid injection hole. The shell is connected with the outer edge of the cover plate body and forms a first exhaust gap with the liquid injection part. The liquid injection part is further provided with an exhaust channel. One end of the exhaust channel is communicated with the first exhaust gap, and the other end of the exhaust channel is communicated with the flow guide through hole. The application solves the problem that in the existing battery cell structure, the insulating tape on the surface of the pole group is easy to form physical interference with the electrolyte flow guide hole arranged below the plastic under the cover plate, thereby blocking the exhaust hole, resulting in incomplete exhaust of the battery cell and causing the battery cell to swell.

Description

Technical Field

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

[0002] In the battery manufacturing process, the pre-charging stage and the baking stage before electrolyte filling are key processes to ensure battery performance and safety. Among them, the pre-charging process is the core link for the first charging activation of the battery cell. During this process, the electrolyte and electrode materials undergo an interfacial reaction, which inevitably generates trace amounts of gas. The baking process before electrolyte filling aims to remove moisture from the inside of the battery cell (including components such as the electrode assembly and casing) to prevent moisture from reacting with the electrolyte to generate harmful gases that affect battery performance. During this baking process, trace amounts of residual organic matter inside the battery cell and the evaporation of moisture will also generate a certain amount of gas.

[0003] To effectively expel the gas generated during the aforementioned processes, existing battery cell structures typically include electrolyte drainage holes beneath the plastic under the cover plate as venting ports. These holes guide the gas inside the cell to the outside, preventing gas accumulation and pressure buildup. However, during cell assembly, the electrode assembly surfaces are usually covered with insulating tape to secure the electrode assembly structure and prevent short circuits between the electrode assembly and metal components such as the casing and cover plate. However, the tape is prone to misalignment, wrinkles, or over-covering, causing physical interference between the tape and the electrolyte drainage holes beneath the cover plate. This blockage of the venting ports leads to incomplete gas expulsion and cell bulging. Summary of the Invention

[0004] The purpose of this application is to provide a battery cell and an electrical device that solves the problem that existing battery cell structures typically have electrolyte drainage holes under the plastic cover as venting holes to guide the gas inside the battery cell to the outside. However, the insulating tape on the electrode surface and the venting holes are prone to physical interference, which can block the venting holes and cause the battery cell to bulge due to incomplete venting.

[0005] According to a first aspect of this application, a battery cell is provided, the battery cell including a cover plate and a housing. The cover plate has a thickness direction and includes a cover plate body and a first plastic part. The first plastic part is connected to one side of the cover plate body in the thickness direction, and a projection of the first plastic part and the cover plate body is made along the thickness direction onto a plane perpendicular to the thickness direction. The projection outline of the first plastic part falls completely within the projection outline range of the cover plate body. The cover plate body has an injection hole that penetrates itself along the thickness direction. The first plastic part includes an injection portion corresponding to the injection hole. The injection portion has a guide hole that penetrates itself along the thickness direction and is aligned and connected to the injection hole. The housing is connected to the cover plate body at a portion corresponding to the outer edge of its projection outline, and a first venting gap is formed between the housing and the injection portion. The injection portion is also provided with a venting channel, one end of which is connected to the first venting gap and the other end of which is connected to the guide hole.

[0006] In any of the above technical solutions, the venting channel is further formed as a venting groove, and the venting groove is disposed on the side of the injection part facing the cover plate body.

[0007] In any of the above technical solutions, the cover plate body further includes a processing part, the processing part having a boss protruding toward the side where the first plastic part is located; the side of the injection part facing the cover plate body is also provided with a positioning groove communicating with the venting groove, the guiding hole passes through the positioning groove, the positioning groove is correspondingly provided with the boss, so that the injection hole and the guiding hole are aligned and communicated, a second venting gap is formed between the boss and the bottom surface of the positioning groove, one end of the venting groove extends to the positioning groove, and the other end extends to the first venting gap, so as to connect the second venting gap and the first venting gap.

[0008] In any of the above technical solutions, the cover plate further has a length direction perpendicular to the thickness direction, the injection hole is disposed at the end of the cover plate body, and the injection part is disposed at the end of the first plastic part; the venting groove extends along the length direction, and the other end of the venting groove extends to the edge of the injection part.

[0009] In any of the above technical solutions, a plurality of injection grooves are provided on the side of the injection part opposite to the cover plate body. The plurality of injection grooves are arranged circumferentially along the guide hole, and each injection groove is connected to the guide hole.

[0010] In any of the above technical solutions, one end of each injection groove extends to the guide hole, and the other end extends to the edge of the injection section.

[0011] In any of the above technical solutions, the cover plate further satisfies: S1 / S2≥0.5, where S1 is the cross-sectional area of ​​the opening connecting the exhaust groove and the first exhaust gap, and S2 is the cross-sectional area of ​​the injection hole perpendicular to the thickness direction.

[0012] In any of the above technical solutions, the cover plate further includes a width direction, and the length direction, width direction, and thickness direction are mutually perpendicular; the venting groove is a rectangular groove, and the injection hole is a circular hole; wherein, S1=m×h, m is the dimension of the venting groove in the width direction, and h is the dimension of the venting groove in the thickness direction; S2=πd 2 / 4, where d is the diameter of the injection hole.

[0013] In any of the above technical solutions, further, in the thickness direction, the distance between the boss and the bottom surface of the positioning groove is 0.5mm-1.5mm.

[0014] According to a second aspect of this application, an electrical device is provided, including the battery cell as described above.

[0015] The battery cell of this application includes a cover plate and a housing. The cover plate includes a cover plate body and a first plastic part. The first plastic part is connected to one side of the cover plate body, and its projection onto a plane perpendicular to the thickness direction is along the thickness direction, with the projection outline of the first plastic part completely falling within the projection outline of the cover plate body. The cover plate body has a liquid injection hole penetrating through itself along the thickness direction. The first plastic part includes a liquid injection portion corresponding to the liquid injection hole, and the liquid injection portion has a guide hole penetrating through itself along the thickness direction, which is aligned and connected to the liquid injection hole. The housing is connected to the cover plate body at a location corresponding to the outer edge of its projection outline, and a first venting gap is formed between the housing and the liquid injection portion. The liquid injection portion also has a venting channel, one end of which communicates with the first venting gap, and the other end of which communicates with the guide hole.

[0016] Based on the above technical features, the beneficial effects of this application are as follows:

[0017] The cover plate of this application adds an additional venting path to the original venting path (guide hole - injection hole), that is, an venting channel is set on the injection part, one end of the venting channel is connected to the first venting gap, and the other end is connected to the guide hole, thus forming a new additional venting path (first venting gap - venting channel - guide hole - injection hole). With this setting, when the guide hole is blocked, the gas inside the cell can pass through the first venting gap - venting channel - guide hole - injection hole, so as to avoid the problem of cell swelling caused by incomplete venting of the cell.

[0018] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 An exploded view of the overall structure of the cover plate according to an embodiment of this application is shown.

[0021] Figure 2 Show Figure 1 Top view;

[0022] Figure 3 Show Figure 2 A schematic diagram of the AA cross-sectional structure;

[0023] Figure 4 Show Figure 3 Enlarged schematic diagram of part of the structure;

[0024] Figure 5 A schematic diagram of a first exhaust path according to an embodiment of this application is shown;

[0025] Figure 6 A schematic diagram of the second exhaust path according to an embodiment of this application is shown;

[0026] Figure 7 A top view of a first plastic part according to an embodiment of this application is shown;

[0027] Figure 8 Show Figure 7 Schematic diagram of CC cross-section structure;

[0028] Figure 9 A schematic diagram of the overall structure of the first plastic part according to an embodiment of this application is shown;

[0029] Figure 10 Show Figure 9 Enlarged schematic diagram of part of the structure;

[0030] Figure 11 Show Figure 10 A structural diagram from another perspective.

[0031] Icons: 100-Cover plate body; 110-Injection hole; 120-Machining part; 121-Boss; 200-First plastic part; 210-Injection part; 211-Guide hole; 212-Ventilation groove; 213-Positioning groove; 214-Injection groove; X-Length direction; Y-Width direction; Z-Thickness direction. Detailed Implementation

[0032] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0033] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0034] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0035] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0036] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0037] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0038] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0039] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0040] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0041] The first aspect of this application provides a battery cell that solves the problem that existing battery cell structures typically have electrolyte drainage holes under the plastic cover as venting holes to guide gas inside the cell to the outside. However, the insulating tape on the electrode surface easily interferes with the venting holes, thus blocking them and causing incomplete venting and cell bulging. See below for reference. Figures 1 to 11 The cover plate described according to some embodiments of this application is further illustrated. Additionally, for ease of description, the cover plate will hereinafter be described as having a length direction X, a width direction Y, and a thickness direction that are perpendicular to each other.

[0042] like Figures 1 to 4 As shown, the battery cell of this application includes a cover plate and a housing. The cover plate includes a cover plate body 100 (e.g., a plain aluminum plate) and a first plastic part 200. The first plastic part 200 is connected to one side of the cover plate body 100, and along the thickness direction Z, the projection of the first plastic part 200 and the cover plate body 100 onto a plane perpendicular to the thickness direction Z is made. The projection outline of the first plastic part 200 falls completely within the projection outline range of the cover plate body 100. The cover plate body 100 has an injection hole 110 that penetrates itself along the thickness direction Z. The first plastic part 200 includes an injection part 210 corresponding to the injection hole 110. The injection part 210 has a guide hole 211 that penetrates itself along the thickness direction Z. The guide hole 211 is aligned and connected to the injection hole 110. The shell is connected to the outer edge of the cover plate body 100 (i.e., the shell is connected to the part of the cover plate body 100 corresponding to the outer edge of its projection outline), and a first venting gap is formed between the shell and the injection part 210 (the shell is not shown in the figure). The injection part 210 is also provided with a venting channel. One end of the venting channel is connected to the first venting gap, and the other end is connected to the guide hole 211.

[0043] With this configuration, the cover plate of this application adds an additional venting path to the original venting path (guide hole 211 - injection hole 110). Specifically, an venting channel is provided on the injection section 210, with one end connected to the first venting gap and the other end connected to the guide hole 211, thus forming a new additional venting path (first venting gap - venting channel - guide hole 211 - injection hole 110). With this configuration, when the guide hole 211 is blocked, the gas inside the cell can pass through the first venting gap - venting channel - guide hole 211 - injection hole 110, avoiding the problem of incomplete venting causing cell swelling. On the other hand, when a vacuum is drawn during the injection process, because the guide hole 211 is connected to the inside of the cell by the additional venting path, the gas pressure inside the guide hole 211 is close to that inside the cell, making it less likely for the electrode assembly to block the guide hole 211, thus facilitating venting.

[0044] In embodiments of this application, to further facilitate the manufacture of the cover plate, as an example, such as... Figure 4 , Figure 10 and Figure 11 As shown, the venting channel is formed as a venting groove 212, which is provided on the side of the injection section 210 facing the cover plate body 100. Figure 4 As shown, the cover plate body 100 includes a processing section 120, which is stamped to form a boss 121 protruding toward the side where the first plastic part 200 is located; as Figure 4 , Figure 10 and Figure 11 As shown, the side of the injection section 210 facing the cover plate body 100 is also provided with a positioning groove 213 that communicates with the venting groove 212. The guide hole 211 passes through the positioning groove 213. The positioning groove 213 is correspondingly provided with the boss 121 (matched installation) so that the injection hole 110 and the guide hole 211 are aligned and connected. A second venting gap is formed between the bottom surface of the boss 121 and the positioning groove 213. One end of the venting groove 212 extends to the positioning groove 213, and the other end extends to the first venting gap to connect the second venting gap and the first venting gap.

[0045] With this configuration, a second exhaust gap is formed between the bottom surface of the boss 121 and the positioning groove 213. One end of the exhaust groove 212 extends to the positioning groove 213, and the other end extends to the first exhaust gap, connecting the second exhaust gap and the first exhaust gap, thereby forming a new additional exhaust path, such as... Figure 5 As shown (first venting gap - venting groove 212 - second venting gap on guide hole 211 - liquid injection hole 110), when the guide hole 211 is blocked, the gas inside the cell can pass through the first venting gap - venting groove 212 - second venting gap on guide hole 211 - liquid injection hole 110, thus avoiding the problem of incomplete venting of the cell causing cell bulging. Furthermore, it also ensures that the internal and external air pressure of the cell is balanced before sealing.

[0046] Furthermore, in the embodiments of this application, during the cell electrolyte injection process, when the upper surface of the electrode assembly blocks the flow-through hole 211, the electrolyte can flow out from the second venting gap-venting groove 212 to avoid the risk of electrolyte overflow. Simultaneously, during the cell electrolyte injection process, if the upper surface of the electrode assembly blocks the flow-through hole 211 without the new venting path of this application, incomplete venting inside the cell will occur, affecting the injection volume and thus reducing the efficiency of electrolyte injection and increasing the injection time. With the addition of the new venting path in this application, the gas inside the cell can pass through the first venting gap-venting groove 212-the second venting gap on the flow-through hole 211-the injection hole 110, ensuring complete venting inside the cell and thus not affecting the injection volume, thereby increasing the injection efficiency.

[0047] In the embodiments of this application, the distance between the boss 121 and the bottom surface of the positioning groove 213 in the thickness direction Z is 0.5mm-1.5mm. If the distance between the boss 121 and the bottom surface of the positioning groove 213 is <0.5mm, the second venting gap is too small, affecting the venting efficiency. If the distance between the boss 121 and the bottom surface of the positioning groove 213 is >1.5mm, the dimension of the injection part 210 in the thickness direction Z is too small (excluding the thickness of the positioning groove 213 and the venting groove 212), which in turn affects the hot-melt bonding of the insulating film on the outside of the injection part 210. Preferably, the dimension of the injection part 210 in the thickness direction Z (excluding the thickness of the positioning groove 213 and the venting groove 212) is >3mm.

[0048] In the embodiments of this application, such as Figure 4 , Figure 10 and Figure 11 As shown, the injection hole 110 is located at the end of the cover plate body 100, the injection part 210 is located at the end of the first plastic part 200, and the venting groove 212 extends along the length direction X, with the other end of the venting groove 212 extending to the edge of the injection part 210. With this arrangement, both the injection hole 110 and the injection part 210 are located at the end, and the venting and injection-related structures are arranged in an orderly manner along the length direction X. The overall structural layout is neat and avoids complex processing steps caused by structural intersections.

[0049] In the embodiments of this application, as an example, such as Figure 10 and Figure 11 As shown, the exhaust groove 212 is a rectangular groove, and the injection hole 110 is a circular hole. The cover plate satisfies: S1 / S2≥0.5, where S1 is the cross-sectional area of ​​the opening connecting the exhaust groove 212 to the first exhaust gap, and S2 is the cross-sectional area of ​​the injection hole 110 perpendicular to the thickness direction Z. With this configuration, if S1 / S2<0.5, the flow capacity of the exhaust groove 212 will be insufficient, which will reduce the exhaust efficiency.

[0050] Among them, such as Figure 7 and Figure 8 As shown, S1 = m × h, where m is the dimension of the exhaust groove 212 in the width direction Y, and h is the dimension of the exhaust groove 212 in the thickness direction Z. Figure 5 As shown, S2=πd 2 / 4, where d is the diameter of injection hole 110.

[0051] Specific case data is as follows:

[0052] 1. The diameter of the injection hole 110 and the width of the venting groove 212 are fixed, d=3mm and m=3mm; by taking different values ​​of the venting groove 212 depth h, the cell thickness in the process is measured to see if it meets the requirements (17.5mm±0.2mm) under different values ​​of venting groove 212 depth.

[0053]

[0054] 2. The diameter of the injection hole 110 and the width of the venting groove 212 are fixed, d=3.5mm and m=3mm; by taking different values ​​of the venting groove 212 depth h, the cell thickness in the process is measured to see if it meets the requirements (20mm±0.2mm) under different values ​​of venting groove 212 depth.

[0055]

[0056] 3. The diameter of the injection hole 110 and the width of the venting groove 212 are fixed, d=3.5mm and m=4mm; by taking different values ​​of the venting groove 212 depth h, the cell thickness in the process is measured to see if it meets the requirements (21mm±0.2mm) under different values ​​of venting groove 212 depth.

[0057]

[0058] The above cases show that when S1 / S2≥0.5, there are no abnormalities in the cell manufacturing process and no swelling.

[0059] In the embodiments of this application, such as Figure 4 , Figure 9 and Figure 10 As shown, a plurality of injection grooves 214 are provided on the side of the injection section 210 opposite to the cover plate body 100. The plurality of injection grooves 214 are arranged circumferentially along the guide hole 211, and each injection groove 214 is connected to the guide hole 211. With this arrangement, during the injection process, the electrolyte flowing down from the guide hole 211 is guided to various directions through the plurality of injection grooves 214, which not only makes the injection uniform, but also improves the injection efficiency (the electrode assembly is in contact with the bottom surface of the injection section 210). Moreover, the present application provides a plurality of injection grooves 214 on one side of the injection section 210, which simplifies the manufacturing process.

[0060] Furthermore, in the embodiments of this application, such as Figure 9 As shown, Figure 9 The diagram illustrates the configuration of four injection slots 214 arranged in a cross shape. One end of each injection slot 214 extends to the guide hole 211, and the other end extends to the edge of the injection section 210, communicating with the first venting gap. This arrangement allows for proper functioning when the guide hole 211 becomes blocked, such as... Figure 6 As shown, the gas inside the battery cell can pass through the first venting gap - liquid injection tank 214 - guide hole 211 - liquid injection hole 110 to avoid the problem of battery cell swelling caused by incomplete venting.

[0061] A second aspect of this application provides an electrical device including a battery cell as described above.

[0062] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the scope of the technology disclosed in this application, or make equivalent substitutions for some of the technical features. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application.

Claims

1. A battery cell, characterized in that, The battery cell includes a cover plate and a housing. The cover plate has a thickness direction and includes a cover plate body and a first plastic part. The first plastic part is connected to one side of the cover plate body in the thickness direction. Along the thickness direction, the first plastic part and the cover plate body are projected onto a plane perpendicular to the thickness direction. The projection outline of the first plastic part falls completely within the projection outline range of the cover plate body. The cover plate body has an injection hole that penetrates itself along the thickness direction; The first plastic part includes an injection portion corresponding to the injection hole, the injection portion having a guide hole that extends through itself along the thickness direction, the guide hole being aligned and communicating with the injection hole; The housing is connected to the part of the cover plate body corresponding to the outer edge of its projected outline, and a first venting gap is formed between the housing and the liquid injection part; The injection section is also provided with an exhaust channel, one end of which is connected to the first exhaust gap and the other end is connected to the guide hole.

2. The battery cell according to claim 1, characterized in that, The venting channel is formed as a venting groove, which is located on the side of the injection section facing the cover plate body.

3. The battery cell according to claim 2, characterized in that, The cover plate body includes a processing part, and the processing part is formed with a boss protruding toward the side where the first plastic part is located; The side of the injection section facing the cover plate body is also provided with a positioning groove that communicates with the venting groove. The guide hole passes through the positioning groove. The positioning groove is correspondingly provided with the boss so that the injection hole and the guide hole are aligned and communicated. A second venting gap is formed between the boss and the bottom surface of the positioning groove. One end of the venting groove extends to the positioning groove, and the other end extends to the first venting gap so as to connect the second venting gap and the first venting gap.

4. The battery cell according to claim 2, characterized in that, The cover plate also has a length direction perpendicular to the thickness direction, the injection hole is disposed at the end of the cover plate body, and the injection part is disposed at the end of the first plastic part; The venting groove extends along the length direction, and the other end of the venting groove extends to the edge of the injection section.

5. The battery cell according to claim 4, characterized in that, The cover plate satisfies: S1 / S2≥0.5, where S1 is the cross-sectional area of ​​the opening connecting the exhaust groove and the first exhaust gap, and S2 is the cross-sectional area of ​​the injection hole perpendicular to the thickness direction.

6. The battery cell according to claim 5, characterized in that, The cover plate also has a width direction, and the length direction, the width direction and the thickness direction are perpendicular to each other; The venting groove is a rectangular groove, and the injection hole is a round hole; Where S1 = m × h, m is the dimension of the exhaust groove in the width direction, and h is the dimension of the exhaust groove in the thickness direction; S2 = πd 2 / 4, where d is the diameter of the injection hole.

7. The battery cell according to claim 3, characterized in that, In the thickness direction, the distance between the boss and the bottom surface of the positioning groove is 0.5mm-1.5mm.

8. The battery cell according to any one of claims 1-7, characterized in that, The injection section has multiple injection grooves on the side opposite to the cover plate body. The multiple injection grooves are arranged circumferentially along the guide hole, and each injection groove is connected to the guide hole.

9. The battery cell according to claim 8, characterized in that, One end of each of the injection grooves extends to the guide hole, and the other end extends to the edge of the injection section.

10. An electrical appliance, characterized in that, The battery cell includes any one of claims 1-9.

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