Battery cell and electric equipment
By setting additional venting paths on the cell cover, the problem of insulating tape blocking the venting holes was solved, enabling effective venting and liquid injection of the cell, and avoiding cell bulging and reduced liquid injection efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SVOLT ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2026-03-11
- Publication Date
- 2026-05-08
AI Technical Summary
In the existing cell structure, the insulating tape on the surface of the electrode group is prone to physical interference with the electrolyte guide hole under the cover plate, which leads to blockage of the vent hole, resulting in incomplete venting and swelling of the cell.
An additional venting path is added to the cell cover plate by setting an inwardly recessed venting groove on the side wall of the injection tank and opening an venting hole on the side to form a new venting path (venting gap - venting groove - venting hole - injection tank - injection hole) to facilitate gas discharge.
This avoids the swelling problem caused by incomplete venting of the battery cell, improves venting efficiency, and maintains the internal and external air pressure balance of the battery cell during the liquid injection process, preventing the electrode group from clogging the liquid injection guide hole and increasing the liquid injection efficiency.
Smart Images
Figure CN122000416A_ABST
Abstract
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 having a length direction and a thickness direction perpendicular to each other, the cover plate including 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 first plastic part and the cover plate body are projected onto a plane perpendicular to the thickness direction, the projected outline of the first plastic part completely falling within the projected outline range of the cover plate body; the cover plate body has a through-hole for liquid injection, the first plastic part includes a liquid injection groove corresponding to the liquid injection hole, the liquid injection groove is disposed at one end of the first plastic part in the length direction, and the bottom wall of the liquid injection groove has a through-hole for liquid injection; the housing is connected to the cover plate body at a portion corresponding to the outer edge of its projected outline, and an venting gap exists between the housing and the liquid injection groove; the side wall of the liquid injection groove has a venting groove recessed into the liquid injection groove on one side in the length direction, the venting groove is open on one side in the length direction, the venting groove has a through-hole for venting, the venting hole connecting the venting gap and the liquid injection groove.
[0006] In any of the above technical solutions, the cover plate further includes a width direction, and the length direction, the width direction, and the thickness direction are perpendicular to each other. The exhaust groove is open on one side facing the cover plate body, on both sides opposite each other in the width direction, and on one side in the length direction.
[0007] In any of the above technical solutions, the injection tank further includes a main structure and an exhaust structure. The exhaust structure includes a horizontal plate and a vertical plate connected to each other. The horizontal plate is perpendicular to the thickness direction, and the vertical plate is perpendicular to the length direction. The side wall of the main structure has an L-shaped notch. The L-shaped notch faces the cover plate body. The exhaust structure is fitted into the L-shaped notch, and the outer peripheral surface of the exhaust structure is connected to the groove wall surface of the L-shaped notch to form the exhaust groove. The vertical plate is attached to the cover plate body, and there is a distance between the horizontal plate and the cover plate body. The exhaust hole is opened on the horizontal plate.
[0008] In any of the above technical solutions, the first plastic part further includes a reinforcing rib; the sidewall of the main structure includes two first connecting walls opposite each other in the width direction and a second connecting wall in the length direction, and the L-shaped notch is formed on the side of the two first connecting walls and the second connecting wall facing the cover plate body; one end of the reinforcing rib is connected to the bottom wall and the second connecting wall, and the other end extends to the vertical plate and is connected to the vertical plate.
[0009] In any of the above technical solutions, the number of exhaust holes is multiple, and the multiple exhaust holes are spaced apart along the width direction.
[0010] In any of the above technical solutions, the cover plate further satisfies: S1 / S2≥0.5, where S1 is the sum of the cross-sectional areas of the plurality of vent holes, S2 is the cross-sectional area of the injection hole, and the cross-sectional direction is perpendicular to the thickness direction.
[0011] In any of the above technical solutions, further, in the thickness direction, the distance h1 from the horizontal plate to the cover plate body is 0.5mm-1.5mm.
[0012] In any of the above technical solutions, the cover plate further satisfies: h-h1>3mm, where h is the distance from the bottom wall to the cover plate body in the thickness direction.
[0013] In any of the above technical solutions, the central region of the bottom wall is positioned directly opposite the injection hole, the central region of the bottom wall is a solid structure, and there are multiple injection guide holes arranged circumferentially along the solid structure.
[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 outer edge is located inside the outer edge of the cover plate body. The cover plate body has a through-hole for liquid injection. The first plastic part includes a liquid injection groove corresponding to the liquid injection hole, located at one end of the first plastic part along its length. The bottom wall of the liquid injection groove has a through-hole for liquid injection. The housing is connected to the outer edge of the cover plate body, and there is an venting gap between the housing and the liquid injection groove. One side of the sidewall of the liquid injection groove along its length has a venting groove recessed into the groove. One side of the venting groove along its length is open, and it has a through-hole for venting, which connects the venting gap to the liquid injection groove.
[0016] Based on the above technical features, the beneficial effects of this application are as follows: The cell cover plate of this application adds an additional venting path to the existing venting path (injection guide hole - injection tank - injection hole). First, the injection hole and injection tank are both located at the end, and the venting and injection-related structures are arranged in an orderly manner along the length direction, resulting in a neat overall structure layout and avoiding complex processing steps caused by structural intersections. Second, an venting groove that is recessed into the injection tank is provided on one side of the sidewall of the injection tank along the length direction. The venting groove is open on one side along the length direction and has a through-hole. The venting hole connects the venting gap and the injection tank, thus forming a new additional venting path (venting gap - venting groove - venting hole - injection tank - injection hole). With this arrangement, when the injection guide hole is blocked, the gas inside the cell can pass through the venting gap - venting groove - venting hole - injection tank - injection hole, thus avoiding the problem of cell swelling caused by incomplete venting. On the other hand, when a vacuum is drawn during the liquid injection process, the liquid injection tank and the inside of the cell are connected by an additional venting path, and the air pressure inside the liquid injection tank and the cell is close to the same. The electrode group is less likely to block the liquid injection guide hole, which facilitates venting.
[0017] 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
[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 A partially enlarged structural diagram; Figure 5 A schematic diagram of the exhaust path of an embodiment of this application is shown; Figure 6 A schematic diagram of the structure of a first plastic part according to an embodiment of this application is shown; Figure 7 Show Figure 6 A partially enlarged structural diagram; Figure 8 Show Figure 6Top view; Figure 9 Show Figure 6 Side view.
[0020] Icons: 100-Cover plate body; 110-Injection hole; 200-First plastic part; 210-Injection groove; 211-Main structure; 2112-First connecting wall; 2113-Second connecting wall; 2114-Bottom wall; 2115-Injection guide hole; 2116-L-shaped notch; 212-Exhaust structure; 2121-Horizontal plate; 2122-Vertical plate; 213-Exhaust hole; 230-Reinforcing rib; X-Length direction; Y-Width direction; Z-Thickness direction. Detailed Implementation
[0021] 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.
[0022] 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.
[0023] 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.
[0024] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.
[0025] 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.
[0026] 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.
[0027] 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.
[0028] 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.
[0029] 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.
[0030] 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 9 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.
[0031] like Figures 1 to 5 As shown, the battery cell of this application includes a cover plate and a housing (the housing is not shown). 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 the outer edge of the first plastic part 200 is located inside the outer edge of the cover plate body 100 (i.e., 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, the projection outline of the first plastic part 200 completely falls within the projection outline range of the cover plate body 100). The cover plate body 100 has a through-hole injection hole 110, and the first plastic part 200 includes an injection groove 210 corresponding to the injection hole 110. The injection groove 210 is located... At one end of the first plastic part 200 in the length direction X, the bottom wall 2114 of the injection tank 210 has an injection guide hole 2115 that penetrates itself; the shell and the cover plate body 100 are connected at the part corresponding to the outer edge of its projected outline, and there is an exhaust gap between them and the injection tank 210; the side wall of the injection tank 210 is provided with an exhaust groove that is recessed into the injection tank 210 on one side in the length direction X, the exhaust groove is open on one side in the length direction X, and the exhaust groove has an exhaust hole 213 that penetrates itself, and the exhaust hole 213 connects the exhaust gap and the injection tank 210.
[0032] With this configuration, the cell cover of this application adds an additional venting path to the existing venting path (injection guide hole 2115 - injection groove 210 - injection hole 110). Firstly, the injection hole 110 and injection groove 210 are both located at the ends, and the venting and injection-related structures are arranged in an orderly manner along the length direction X, resulting in a neat overall layout and avoiding complex processing steps caused by structural intersections. Secondly, an venting groove recessed into the injection groove 210 is provided on one side of the sidewall of the injection groove 210 along the length direction X. The venting groove is open on one side along the length direction X and has a through-hole venting hole 213. The venting hole 213 connects the venting gap and the injection groove 210, thus forming a new additional venting path (venting gap - venting groove - venting hole 213 - injection groove 210 - injection hole 110). With this configuration, when the injection guide hole 2115 is blocked, such as... Figure 5As shown, the gas inside the cell can pass through the venting gap-venting groove-venting hole 213-injection groove 210-injection hole 110 to avoid the problem of incomplete venting causing cell bulging. On the other hand, when a vacuum is drawn during the injection process, since the injection groove 210 and the inside of the cell are connected by an additional venting path, the gas pressure in the injection groove 210 and the inside of the cell is close to the same, and the electrode assembly is less likely to block the injection guide hole 2115, thus facilitating venting.
[0033] In the embodiments of this application, preferably, such as Figure 6 and Figure 7 As shown, the exhaust groove is open on one side facing the cover plate body 100, on both sides opposite each other in the width direction Y, and on one side in the length direction X. That is, when the exhaust groove of this application is connected to the cover plate body 100, the side of the exhaust groove facing the cover plate body 100 is in contact with the cover plate, and the two sides opposite each other in the width direction Y and one side in the length direction X are open, all communicating with the exhaust gap, thus increasing exhaust efficiency. As an example, the exhaust groove can be an L-shaped exhaust groove formed by an L-shaped structural member; the specific structure of the exhaust groove of this application will be described below.
[0034] In the embodiments of this application, such as Figure 6 and Figure 7 As shown, the injection tank 210 includes a main structure 211 and an exhaust structure 212. The exhaust structure 212 includes a horizontal plate 2121 and a vertical plate 2122 connected to each other. The horizontal plate 2121 is perpendicular to the thickness direction Z, and the vertical plate 2122 is perpendicular to the length direction X. An L-shaped notch 2116 is formed on the side wall of the main structure 211. The L-shaped notch 2116 is positioned facing the cover plate body 100. The exhaust structure 212 is fitted into the L-shaped notch 2116, and the outer peripheral surface of the exhaust structure 212 is connected to the groove wall surface of the L-shaped notch 2116 to form an exhaust groove. Figure 4 As shown, the vertical plate 2122 is attached to the cover plate body, and there is a distance between the horizontal plate 2121 and the cover plate body 100. The vent 213 is opened on the horizontal plate 2121.
[0035] With this configuration, when the injection guide hole 2115 becomes blocked, such as Figure 5 As shown, the gas inside the battery cell can pass through the venting gap - venting groove (venting structure 212) - venting hole 213 - liquid injection groove 210 - liquid injection hole 110 to avoid the problem of incomplete venting of the battery cell causing bulging. At the same time, it can also make the internal and external air pressure of the battery cell equal before sealing.
[0036] Furthermore, in the embodiments of this application, during the cell electrolyte injection process, when the upper surface of the electrode assembly blocks the electrolyte flow hole 2115 on the bottom wall 2114, the electrolyte in the injection tank 210 can flow out through the vent hole 213 to avoid the risk of electrolyte overflow. Simultaneously, during the cell electrolyte injection process, if the upper surface of the electrode assembly blocks the electrolyte flow hole 2115 on the bottom wall 2114 without the additional venting path of this application, the internal venting of the cell will be incomplete, thus affecting the injection volume, reducing the efficiency of electrolyte injection, and increasing the injection time. With the addition of a new additional venting path in this application, the gas inside the cell can pass through the venting gap – venting tank (venting structure 212) – vent hole 213 – injection tank 210 – injection hole 110, ensuring complete venting inside the cell, thus not affecting the injection volume and increasing the injection efficiency.
[0037] Furthermore, in the embodiments of this application, such as Figure 5 and Figure 7 As shown, the first plastic part 200 also includes a reinforcing rib 230. The sidewalls of the main structure 211 include two first connecting walls 2112 facing each other in the width direction Y, and a second connecting wall 2113 in the length direction X. An L-shaped notch 2116 is formed on the side of the two first connecting walls 2112 and the second connecting wall 2113 facing the cover plate body 100. One end of the reinforcing rib 230 is connected to the bottom wall 2114 and the second connecting wall 2113, and the other end extends to and is connected to the vertical plate 2122, thereby increasing the structural strength of the injection groove 210.
[0038] In the embodiments of this application, such as Figure 7 As shown, there are multiple exhaust holes 213, which are spaced apart along the width direction Y to further improve exhaust efficiency. Figure 7 The diagram shows that the exhaust holes 213 are arranged in a row, with three exhaust holes 213 in a row.
[0039] In the embodiments of this application, the cover plate satisfies: S1 / S2≥0.5, thereby ensuring exhaust efficiency. Here, S1 is the sum of the cross-sectional areas of the multiple exhaust holes 213, and S2 is the cross-sectional area of the injection hole 110, wherein the cross-sectional direction is perpendicular to the thickness direction Z. As... Figure 8 As shown, S1=n πr1 2 ,like Figure 5 As shown, S2=πd 2 / 4.
[0040] Specific example data is as follows: 1. With d=3mm, measure the cell thickness for different r1 values to confirm whether the cell thickness for different r1 values meets the requirement (17.5±0.2mm):
[0041] 2. With d=4mm, measure the cell thickness for different r1 values to confirm whether the cell thickness for different r1 values meets the requirement (20±0.2mm):
[0042] 3. With d=2.5mm, measure the cell thickness for different r1 values to confirm whether the cell thickness for different r1 values meets the requirement (16±0.2mm):
[0043] The data above shows that under the condition that S1 / S2≥0.5, the battery cell will not bulge (the cell thickness meets the tolerance requirements).
[0044] In the embodiments of this application, such as Figure 4 and Figure 9 As shown, in the thickness direction Z, the distance h1 from the horizontal plate 2121 to the cover plate body 100 is 0.5mm-1.5mm. With this setting, if h1 < 0.5mm, the distance from the horizontal plate 2121 to the cover plate body 100 is too small, affecting exhaust efficiency. If h1 > 1.5mm, h-h1 is too small, which in turn affects the heat-melt bonding of the insulating film to the outer side of the second connecting wall 2113 and the horizontal plate 2121. Preferably, the cover plate satisfies: h-h1 > 3mm, where h is the distance from the bottom wall 2114 to the cover plate body 100 in the thickness direction Z.
[0045] In addition, in the embodiments of this application, the middle region of the bottom wall 2114 is positioned directly opposite the injection hole 110. In order to prevent the electrolyte from impacting the electrode assembly and causing damage to the electrode sheet during the cell injection process, the middle region of the bottom wall 2114 of this application is a solid region, and multiple injection guide holes 2115 are provided around the solid region.
[0046] In summary, the cell cover of this application adds an additional venting path to the existing venting path (injection guide hole 2115 - injection groove 210 - injection hole 110). Firstly, the injection hole 110 and injection groove 210 are both located at the end, and the venting and injection-related structures are arranged in an orderly manner along the length direction X, resulting in a neat overall layout and avoiding complex processing steps caused by structural intersections. Secondly, a venting groove recessed into the injection groove 210 is provided on one side of the sidewall of the injection groove 210 along the length direction X. The venting groove is open on one side along the length direction X and has a through-hole venting hole 213. The venting hole 213 connects the venting gap and the injection groove 210, thus forming a new additional venting path (venting gap - venting groove - venting hole 213 - injection groove 210 - injection hole 110). With this configuration, when the injection guide hole 2115 is blocked, such as... Figure 5 As shown, the gas inside the cell can pass through the venting gap-venting groove-venting hole 213-injection groove 210-injection hole 110 to avoid the problem of incomplete venting causing cell bulging. On the other hand, when a vacuum is drawn during the injection process, since the injection groove 210 and the inside of the cell are connected by an additional venting path, the gas pressure in the injection groove 210 and the inside of the cell is close to the same, and the electrode assembly is less likely to block the injection guide hole 2115, thus facilitating venting.
[0047] A second aspect of this application provides an electrical device including a battery cell as described above.
[0048] 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 length direction and a thickness direction that are perpendicular to each other. 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 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 projected outline of the first plastic part falls completely within the projected outline range of the cover plate body. The cover plate body has a through-hole for liquid injection, the first plastic part includes a liquid injection groove corresponding to the liquid injection hole, the liquid injection groove is disposed at one end of the first plastic part in the length direction, and the bottom wall of the liquid injection groove has a through-hole for liquid injection guide; the shell is connected to the part of the cover plate body corresponding to the outer edge of its projected contour, and there is an exhaust gap between the shell and the liquid injection groove. The sidewall of the injection tank has a venting groove recessed into the injection tank on one side in the length direction. The venting groove is open on one side in the length direction and has a venting hole that penetrates through it. The venting hole connects the venting gap with the injection tank.
2. The battery cell according to claim 1, characterized in that, The cover plate also has a width direction, and the length direction, width direction and thickness direction are perpendicular to each other. The exhaust groove is open on one side facing the cover plate body, on both sides opposite each other in the width direction and on one side in the length direction.
3. The battery cell according to claim 2, characterized in that, The injection tank includes a main structure and an exhaust structure. The exhaust structure includes a horizontal plate and a vertical plate connected to each other. The horizontal plate is perpendicular to the thickness direction, and the vertical plate is perpendicular to the length direction. The sidewall of the main structure has an L-shaped notch, which faces the cover plate body. The exhaust structure is fitted into the L-shaped notch, and the outer peripheral surface of the exhaust structure is connected to the groove wall of the L-shaped notch to form the exhaust groove. The vertical plate is attached to the cover plate body, and there is a distance between the horizontal plate and the cover plate body. The vent is opened on the horizontal plate.
4. The battery cell according to claim 3, characterized in that, The first plastic part also includes reinforcing ribs; The sidewall of the main structure includes two first connecting walls that are opposite each other in the width direction and a second connecting wall in the length direction, and the L-shaped notch is formed on the side of the two first connecting walls and the second connecting wall facing the cover plate body; One end of the reinforcing rib is connected to the bottom wall and the second connecting wall, and the other end extends to the vertical plate and is connected to the vertical plate.
5. The battery cell according to claim 3, characterized in that, The number of exhaust holes is multiple, and the multiple exhaust holes are spaced apart along the width direction.
6. The battery cell according to claim 5, characterized in that, The cover plate satisfies: S1 / S2≥0.5, where S1 is the sum of the cross-sectional areas of the plurality of vent holes, S2 is the cross-sectional area of the injection hole, and the cross-sectional direction is perpendicular to the thickness direction.
7. The battery cell according to claim 3, characterized in that, In the thickness direction, the distance h1 from the horizontal plate to the cover plate body is 0.5mm-1.5mm.
8. The battery cell according to claim 7, characterized in that, The cover plate satisfies: h-h1>3mm, where h is the distance from the bottom wall to the cover plate body in the thickness direction.
9. The battery cell according to any one of claims 1-8, characterized in that, The central region of the bottom wall is positioned directly opposite the injection hole. The central region of the bottom wall is a solid structure. There are multiple injection guide holes, which are arranged circumferentially along the solid structure.
10. An electrical appliance, characterized in that, Includes the battery cell as described in any one of claims 1-9.