Battery cell and electric equipment

Abstract

The invention relates to the technical field of battery manufacturing, in particular to a battery cell and electric equipment. 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; a liquid injection hole penetrating through the cover plate body in the thickness direction is formed in the cover plate body; the first plastic part comprises a liquid injection part corresponding to the liquid injection hole, the liquid injection part is provided with a flow guide through hole penetrating through the liquid injection part in the thickness direction, and 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 a first exhaust gap is formed between the shell and the liquid injection part; the liquid injection part is further provided with an exhaust channel, one end of the exhaust channel communicates with the first exhaust gap, and the other end of the exhaust channel communicates with the flow guide through hole. According to the battery cell structure, the problem that in an existing battery cell structure, an insulating rubber tape on the surface of a pole group and an electrolyte flow guide hole formed below cover plate lower plastic cement are prone to forming physical interference, then exhaust holes are blocked, and battery cell inflation is caused due to incomplete battery cell exhaust is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery manufacturing, and particularly relates to a battery cell and a power consumption device. BACKGROUND

[0002] In the production and manufacturing process of a battery, a pre-charging stage of a battery cell and a baking stage before liquid injection are key processes for guaranteeing the performance and safety of the battery. The pre-charging process is a core link of the first charging activation of the battery cell, and in this process, an interface reaction occurs between the electrolyte and the electrode material, which inevitably produces a small amount of gas. The baking process before liquid injection aims to remove the moisture in the battery cell (including the pole group, the shell and other components) to avoid the reaction between the moisture and the electrolyte to generate harmful gas and affect the performance of the battery. In the baking process, the evaporation of the small amount of organic matter and moisture remaining in the battery cell also forms a certain amount of gas.

[0003] To realize the effective discharge of the gas generated in the above processes, the existing battery cell structure usually sets an electrolyte flow guide hole under the plastic below the cover plate as an exhaust hole for guiding the gas in the battery cell to the outside to avoid the accumulation of the gas in the battery cell and the increase of the pressure. However, in the assembly process of the battery cell, the surface of the pole group is usually covered with an insulating tape for fixing the pole group structure and preventing the short circuit of the pole group and the metal components such as the shell and the cover plate. However, the insulating tape on the surface of the pole group is prone to position deviation, wrinkle or excessive covering, which causes the physical interference between the tape and the electrolyte flow guide hole below the cover plate, and further blocks the exhaust hole, resulting in the incomplete discharge of the battery cell and the swelling of the battery cell. SUMMARY

[0004] The present application aims to provide a battery cell and a power consumption device, thereby solving the problem that the existing battery cell structure usually sets an electrolyte flow guide hole under the plastic below the cover plate as an exhaust hole for guiding the gas in the battery cell to the outside, but the insulating tape on the surface of the pole group is prone to physical interference with the exhaust hole, which further blocks the exhaust hole, resulting in the incomplete discharge of the battery cell and the swelling of the battery cell.

[0005] According to the first aspect of the present application, an electric cell is provided, which comprises a cover plate and a shell, the cover plate has a thickness direction, the cover plate comprises a cover plate body and a first plastic part, the first plastic part is connected with one side of the cover plate body in the thickness direction, and along the thickness direction, the projection of the first plastic part and the cover plate body in a plane perpendicular to the thickness direction, the projection profile of the first plastic part is completely within the projection profile of the cover plate body, the cover plate body is provided with a liquid injection hole penetrating through itself along the thickness direction; the first plastic part comprises a liquid injection part corresponding to the liquid injection hole, the liquid injection part is provided with a flow guide through hole penetrating through itself along the thickness direction, and the flow guide through hole is aligned and communicated with the liquid injection hole; the shell is connected with the part of the cover plate body corresponding to the outer edge of the projection profile, and a first exhaust gap is formed between the shell and 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 is communicated with the flow guide through hole.

[0006] In any of the above technical solutions, further, the exhaust channel is formed as an exhaust groove, and the exhaust groove is arranged on the side of the liquid injection part facing the cover plate body.

[0007] In any of the above technical solutions, further, the cover plate body comprises a processing part, and the processing part is formed with a boss protruding to the side where the first plastic part is located; the side of the liquid injection part facing the cover plate body is further provided with a positioning groove communicated with the exhaust groove, the flow guide through hole passes through the positioning groove, and the positioning groove is arranged corresponding to the boss, so that the liquid injection hole is aligned and communicated with the flow guide through hole, a second exhaust gap is formed between the boss and the bottom surface of the positioning groove, one end of the exhaust groove extends to the positioning groove, and the other end extends to the first exhaust gap, so as to communicate the second exhaust gap with the first exhaust gap.

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

[0009] In any of the above technical solutions, further, the side of the liquid injection part opposite to the cover plate body is provided with a plurality of liquid injection grooves, the plurality of liquid injection grooves are arranged along the circumferential direction of the flow guide through hole, and each of the liquid injection grooves is communicated with the flow guide through hole.

[0010] In any of the above technical solutions, further, one end of each of the liquid injection grooves extends to the flow guide through hole, and the other end extends to the edge of the liquid injection part.

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

[0012] In any of the above technical solutions, further, the cover plate further has a width direction, the length direction, the width direction and the thickness direction are perpendicular to each other; the exhaust groove is a rectangular groove, and the liquid injection hole is a circular hole; wherein S1=m×h, m is the size of the exhaust groove in the width direction, and h is the size of the exhaust groove in the thickness direction; S2=πd 2 / 4, and d is the diameter of the liquid 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 the second aspect of the present application, a power consuming device is provided, which comprises the battery cell as described above.

[0015] The battery cell of the present application comprises a cover plate and a shell. The cover plate comprises a cover plate body and a first plastic part. The first plastic part is connected to one side of the cover plate body, and along the thickness direction, the projection of the first plastic part and the cover plate body on a plane perpendicular to the thickness direction is completely within the projection contour of the cover plate body. The cover plate body is provided with a liquid injection hole penetrating through itself along the thickness direction. The first plastic part comprises a liquid injection part corresponding to the liquid injection hole. The liquid injection part is provided with a flow guide through hole penetrating through itself along the thickness direction. The flow guide through hole is aligned and communicated with the liquid injection hole. The shell is connected to the part of the cover plate body corresponding to the outer edge of the projection contour, and forms a first exhaust gap with the liquid injection part. The liquid injection part is further provided with an exhaust passage. One end of the exhaust passage is communicated with the first exhaust gap, and the other end is communicated with the flow guide through hole.

[0016] According to the above technical features, the present application has the following beneficial effects: The cover plate of the present application increases an additional exhaust path on the basis of the original exhaust path (flow guide through hole-liquid injection hole), i.e. an exhaust passage is arranged on the liquid injection part. One end of the exhaust passage is communicated with the first exhaust gap, and the other end is communicated with the flow guide through hole, thereby forming a new additional exhaust path (first exhaust gap-exhaust passage-flow guide through hole-liquid injection hole). In this way, when the flow guide through hole is blocked, the gas inside the battery cell can pass through the first exhaust gap-exhaust passage-flow guide through hole-liquid injection hole, thereby avoiding the problem of battery cell swelling caused by incomplete battery cell exhaust.

[0017] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. Attached Figure Description

[0018] 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.

[0019] Figure 1 An exploded view of the overall structure of the cover plate according to an embodiment of this application is shown. Figure 2 Show Figure 1 Top view; Figure 3 Show Figure 2 A schematic diagram of the AA cross-sectional structure; Figure 4 Show Figure 3 Enlarged schematic diagram of part of the structure; Figure 5 A schematic diagram of a first exhaust path according to an embodiment of this application is shown; Figure 6 A schematic diagram of the second exhaust path according to an embodiment of this application is shown; Figure 7 A top view of a first plastic part according to an embodiment of this application is shown; Figure 8 Show Figure 7 Schematic diagram of CC cross-section structure; Figure 9 A schematic diagram of the overall structure of the first plastic part according to an embodiment of this application is shown; Figure 10 Show Figure 9 Enlarged schematic diagram of part of the structure; Figure 11 Show Figure 10 A structural diagram from another perspective.

[0020] 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

[0021] The following detailed description is presented to aid the reader in gaining a comprehensive understanding of the methods, apparatuses, and / or systems described herein. However, various changes, modifications, and equivalents can be used, and thus particular embodiments described herein are not intended as being exhaustive of what the present disclosure can provide. For example, although processes are described with regard to the present disclosure, such processes can include more, fewer, or only a single process. Additionally, some processes can not be implemented even though they are described. Moreover, although processes are described herein as various separate processes, which can be performed by different systems, such processes can not necessarily be performed by different systems and the order of some processes can be changed, including that certain processes could be performed in an iterative or parallel manner. Additionally, various features that are described herein can be implemented as hardware, software, firmware, or combinations thereof, and can be implemented within one or more processors or external to one or more processors, including being implemented across multiple processors. Further, it will be appreciated that features described herein as being implemented with or across one or more processors can be implemented by one or more other processors.

[0022] The features described herein can be implemented in different forms and are not to be construed as limited to the examples described herein. Rather, the described examples have been provided for illustrative purposes so that those skilled in the art will be able to implement the methods, apparatuses, and / or systems described herein in a variety of ways.

[0023] Throughout the specification, when an element (such as a layer, region, or substrate) is referred to as being "on" another element, "connected to" another element, "coupled to" another element, "adjacent to" another element, "on top of" another element, or "covering" another element, it can be directly on, connected to, coupled to, adjacent to, on top of, or covering the other element, or one or more other elements can be interposed therebetween. In contrast, when an element is referred to as being "directly on," "directly connected to," "directly coupled to," "directly adjacent to," "directly on top of," or "directly covering" another element, there are no other elements interposed therebetween.

[0024] As used herein, the term "and / or" includes any one of the listed items and any combination of two or more of the listed items.

[0025] Although terms such as "first" and "second" can be used herein to describe various elements, components, regions, layers, or sections, these elements, components, regions, layers, or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer, or section from another element, component, region, layer, or section. Thus, the first element, component, region, layer, or section described in the examples described herein could also be called a second element, component, region, layer, or section, without departing from the teachings of the examples.

[0026] For ease of description, spatially relative terms, such as "on", "upper", "lower", "above", and "below", can be used herein for the purpose of illustrating one element's or portion's relationship to another element(s) or portion(s) as illustrated in the figures. Such spatially relative terms can be interpreted differently depending on the specific context in which they are used. For example, if an element in the figures is turned over, then a portion that was above another portion would now be below that portion. Such a relative term can include both the case where the specific spatial relationship is shown in the figures and the case where the specific spatial relationship is reversed. For example, if the device in the figures is turned over, then a portion that is above another portion would now be below that portion. Accordingly, the term "above" encompasses both the cases where the element is above the other element and where the element is below the other element unless the context indicates otherwise. The device can be oriented in other ways (e.g., rotated 90 degrees or at other orientations) and the spatially relative terms used herein interpreted accordingly.

[0027] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has", "having" and the like are inclusive and open-ended and specify the presence of stated features, integers, operations, members, elements and / or groups but do not preclude the presence or addition of one or more other features, integers, operations, members, elements and / or groups thereof.

[0028] Variations in the shapes of the elements illustrated in the figures can occur as a result of manufacturing processes and / or tolerances. Thus, the examples described herein are not limited to the specific shapes illustrated in the figures, but include variations in shapes that would occur as a result of manufacturing processes.

[0029] Features of the examples described herein can be combined with one another as would be apparent to one of ordinary skill in the art after having the benefit of the present disclosure. Furthermore, although examples are described herein with various configurations, other configurations can also be possible as would be apparent to one of ordinary skill in the art after having the benefit of the present disclosure.

[0030] The first aspect of the present application provides an electric core, thereby solving the problem that the existing electric core structure usually sets an electrolyte flow guide hole under the plastic under the cover plate as an exhaust hole to guide the gas inside the electric core to the outside, but the insulating tape on the surface of the electrode group is easy to form physical interference with the exhaust hole, thereby blocking the exhaust hole, causing the electric core to swell due to incomplete exhaust of the electric core. Below, with reference to Figures 1 to 11 A cover plate according to some embodiments of the present application is described. In addition, for ease of description, the following will introduce the length direction X, the width direction Y and the thickness direction Z perpendicular to each other which the cover plate has.

[0031] As Figures 1 to 4As 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.

[0032] 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.

[0033] 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 11As 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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 the injection hole 110.

[0040] Specific case data is as follows: 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.

[0041]

[0042] 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.

[0043]

[0044] 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.

[0045]

[0046] The above cases show that when S1 / S2≥0.5, there are no abnormalities in the cell manufacturing process and no swelling.

[0047] 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.

[0048] 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.

[0049] A second aspect of this application provides an electrical device including a battery cell as described above.

[0050] 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 outer edge of the cover plate body corresponding to 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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