Battery cells and electrical equipment

Abstract

This application relates to the field of battery manufacturing technology, and in particular to a battery cell and an electrical device. The battery cell includes an electrode assembly, 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 the side of the cover plate body facing the electrode assembly. The cover plate body includes a liquid injection hole processing section with a through-hole. The first plastic part includes a liquid injection groove corresponding to the liquid injection hole, and 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 a venting gap exists between the housing and the first plastic part. A venting groove is formed on the side of the cover plate body facing the electrode assembly, with one end extending to the outer edge of the cover plate body and the other end extending to the outer edge of the liquid injection hole processing section to connect the venting gap and the liquid injection groove. This application solves the problem that the additional venting channels added in the prior art are not only complex to process but also have low venting efficiency.

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 incorporate electrolyte drainage holes beneath the plastic under the cover plate as venting ports to guide internal gas to the outside, preventing gas accumulation and pressure buildup. However, during battery cell assembly, the electrode surfaces are usually covered with insulating tape. Unfortunately, this tape is prone to misalignment, wrinkling, 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 release and cell bulging.

[0004] In response to this, existing technologies incorporate additional venting channels during the manufacturing process of some batteries to effectively expel gases generated inside the cell, preventing cell bulging caused by incomplete venting. However, these additional venting channels are not only complex to manufacture but also have low venting efficiency. Summary of the Invention

[0005] The purpose of this application is to provide a battery cell and electrical device that solves the problem that the additional exhaust channels added in the prior art are not only complicated to process, but also have low exhaust efficiency.

[0006] According to a first aspect of this application, a battery cell is provided, the battery cell including an electrode assembly, a cover plate, and a housing. The cover plate has a thickness direction and includes a cover plate body and a first plastic part connected to each other in the thickness direction. The first plastic part is connected to the side of the cover plate body facing the electrode assembly, and along the thickness direction, a projection of the first plastic part and the cover plate body is made onto a plane perpendicular to the thickness direction, the projection outline of the first plastic part falling completely within the projection outline range of the cover plate body. The cover plate body includes a liquid injection hole processing part, the liquid injection hole processing part having a liquid injection hole that penetrates itself. The first plastic part includes a liquid injection groove corresponding to the liquid injection hole, the bottom wall of the liquid injection groove having a liquid injection guide hole that penetrates itself. The housing is connected to the cover plate body at a portion corresponding to the outer edge of its projection outline, and an exhaust gap exists between the housing and the first plastic part. An exhaust groove is provided on the side of the cover plate body facing the electrode assembly, one end of the exhaust groove extending to the outer edge of the cover plate body, and the other end extending to the outer edge of the liquid injection hole processing part to connect the exhaust gap and the liquid injection groove.

[0007] In any of the above technical solutions, the injection hole processing part is further disposed at the end of the cover plate body, and the injection groove is disposed at the end of the first plastic part; the cover plate also has a length direction and a width direction, and the length direction, the width direction and the thickness direction are perpendicular to each other; the cover plate body includes two first sides opposite to each other in the width direction and a second side in the length direction; the number of venting grooves is multiple, and the multiple venting grooves are divided into three groups, the number of venting grooves in the first group and the second group is at least one, one end of the venting grooves in the first group and the second group respectively extends to the two first sides, the number of venting grooves in the third group is at least one, and one end of the venting grooves in the third group extends to the second side.

[0008] In any of the above technical solutions, further, the number of venting grooves in the first group, the second group, and the third group is one each; the venting grooves in the first group and the second group extend along the width direction, and the center line of the venting grooves in the first group and the second group, which is parallel to the width direction, intersects the axis of the injection hole; the venting grooves in the third group extend along the length direction, and the center line of the venting grooves in the third group, which is parallel to the length direction, intersects the axis of the injection hole.

[0009] In any of the above technical solutions, the exhaust groove further satisfies: 0.2mm≤Hn≤1.2mm, where Hn is the dimension of the exhaust groove in the thickness direction.

[0010] In any of the above technical solutions, the cover plate body further includes a substrate, the liquid injection hole is formed on the substrate, and the venting groove is opened on the side of the substrate facing the electrode group; the venting groove satisfies: 5%≤Hn / H≤35%, where Hn is the dimension of the venting groove in the thickness direction and H is the dimension of the substrate in the thickness direction.

[0011] In any of the above technical solutions, further, the exhaust grooves of the first and second groups satisfy: 1.0mm≤M1≤5.0mm, where M1 is the dimension of the exhaust groove in the length direction; the exhaust grooves of the third group satisfy: 1.0mm≤M2≤5.0mm, where M2 is the dimension of the exhaust groove in the width direction.

[0012] In any of the above technical solutions, further, the venting grooves of the first and second groups satisfy: M1 < D / 1.5, where M1 is the dimension of the venting groove in the length direction and D is the diameter of the injection hole processing part; the venting grooves of the third group satisfy: M2 < D / 1.5, where M2 is the dimension of the venting groove in the width direction and D is the diameter of the injection hole processing part.

[0013] In any of the above technical solutions, the exhaust groove of the third group further satisfies: 0.05≤M2 / W≤0.25, where M2 is the dimension of the exhaust groove in the width direction and W is the dimension of the cover plate body in the width direction.

[0014] In any of the above technical solutions, the bottom of the exhaust groove is provided with a transition fillet, and the radius R of the transition fillet satisfies: 0.1mm≤R≤1.0mm.

[0015] According to a second aspect of this application, an electrical device is provided, including the battery cell as described above.

[0016] The battery cell of this application includes an electrode assembly, 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 the side of the cover plate body facing the electrode assembly, and the outer edge of the first plastic part is located inside the outer edge of the cover plate body. The cover plate body includes a liquid injection hole processing part with a liquid injection hole that penetrates through it. The first plastic part includes a liquid injection groove corresponding to the liquid injection hole, and the bottom wall of the liquid injection groove has a liquid injection guide hole that penetrates through it. The housing is connected to the outer edge of the cover plate body, and there is an exhaust gap between the housing and the first plastic part. An exhaust groove is provided on the side of the cover plate body facing the electrode assembly. One end of the exhaust groove extends to the outer edge of the cover plate body, and the other end extends to the outer edge of the liquid injection hole processing part to connect the exhaust gap and the liquid injection groove.

[0017] Based on the above technical features, the beneficial effects of this application are as follows:

[0018] The cell cover of this application adds an additional venting path to the original venting path (injection guide hole - injection tank - injection hole). Specifically, an venting groove is opened on the side of the cover body facing the electrode group. One end of the venting groove extends to the outer edge of the cover body, and the other end extends to the outer edge of the injection hole processing part to connect the venting gap and the injection tank, thereby forming a new additional venting path (venting gap - venting groove - injection tank - injection hole). With this configuration, when the injection guide hole is blocked, the gas inside the cell can be discharged through the venting gap - venting groove - injection tank - injection hole.

[0019] Moreover, based on this, one end of the exhaust groove extends to the outer edge of the cover plate body (the exhaust groove end is open), and the other end extends to the outer edge of the injection hole processing part. Not only is the processing technology simple, but the volume of the exhaust groove and the cross-sectional area of ​​the exhaust groove in the exhaust gap / injection groove (air port cross-sectional area) are both large, resulting in high exhaust efficiency.

[0020] 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

[0021] 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.

[0022] Figure 1 A top view of the cover plate according to an embodiment of this application is shown;

[0023] Figure 2 Show Figure 1 A schematic diagram of the AA cross-sectional structure;

[0024] Figure 3 Show Figure 2 Partial structural diagram;

[0025] Figure 4 Show Figure 1 A schematic diagram of the BB cross-sectional structure;

[0026] Figure 5 A schematic diagram of the exhaust path of an embodiment of this application is shown;

[0027] Figure 6 A schematic diagram of the overall structure of the cover plate according to an embodiment of this application is shown;

[0028] Figure 7 Show Figure 6 Partial structural diagram;

[0029] Figure 8 A top view of the cover body according to an embodiment of this application is shown;

[0030] Figure 9 Show Figure 8 Partial structural diagram;

[0031] Figure 10 Show Figure 8 A partial structural schematic diagram of the EE cross-section structure;

[0032] Figure 11 Show Figure 8 Schematic diagram of CC cross-section structure;

[0033] Figure 12 A schematic diagram of the structure of the exhaust channel according to an embodiment of this application is shown;

[0034] Figure 13 A schematic diagram of the structure of the injection hole processing part according to an embodiment of this application is shown.

[0035] Icons: 100-Cover plate body; 110-Injection hole machining section; 111-Protrusion; 112-Injection hole; 113-Annular groove; 120-Ventilation groove; 131-First step section; 132-Second step section; 200-First plastic part; 210-Injection groove; 211-Injection guide hole; 212-Bottom wall; 300-Second plastic part; 400-Riveting block; 500-Pole post; X-Length direction; Y-Width direction; Z-Thickness direction. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] The first aspect of this application provides a battery cell that solves the problem of the additional venting channels in the prior art, which not only complicates processing but also results in low venting efficiency. See below for reference. Figures 1 to 12 The present application describes a battery cell according to some embodiments. Additionally, for ease of description, the cover plate will be described below as having a length direction X, a width direction Y, and a thickness direction that are perpendicular to each other.

[0046] like Figures 2 to 7 As shown, the battery cell of this application includes an electrode assembly, a cover plate, and a housing (the electrode assembly and housing are not shown in the figure). The cover plate includes a cover plate body 100 and a first plastic part 200. The first plastic part 200 is connected to the side of the cover plate body 100 facing the electrode assembly, 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, the projection of the first plastic part and the cover plate body onto a plane perpendicular to the thickness direction completely falls within the projection outline of the cover plate body). The cover plate body 100 includes a liquid injection hole processing section 110, which has a through-hole 112. The first plastic part 200 includes a liquid injection hole 112... The corresponding injection tank 210 has an injection guide hole 211 that penetrates through itself on the bottom wall; the shell is connected to the outer edge of the cover plate body 100 (that is, the shell is connected to the part of the cover plate body corresponding to the outer edge of its projected outline), and there is an exhaust gap between it and the first plastic part 200. An exhaust groove 120 is provided on the side of the cover plate body 100 facing the electrode assembly. One end of the exhaust groove 120 extends to the outer edge of the cover plate body 100, and the other end extends to the outer edge of the injection hole processing part 110 to connect the exhaust gap and the injection tank 210.

[0047] With this configuration, the cover plate of this application adds an additional venting path to the original venting path (injection guide hole 211 - injection groove 210 - injection hole 112). Specifically, an venting groove 120 is formed on the side of the cover plate body 100 facing the electrode assembly. One end of the venting groove 120 extends to the outer edge of the cover plate body 100, and the other end extends to the outer edge of the injection hole processing section 110, connecting the venting gap and the injection groove 210, thus forming a new additional venting path (venting gap - venting groove 120 - injection groove 210 - injection hole 112). With this configuration, when the injection guide hole 211 is blocked, such as... Figure 5 As shown, the gas inside the battery cell can be discharged through the venting gap - venting groove 120 - liquid injection groove 210 - liquid injection hole 112.

[0048] Meanwhile, during the electrolyte injection process, if the guide holes on the upper surface of the electrode assembly are blocked, without the new venting path of this application, the internal venting of the cell will be incomplete, thus affecting the electrolyte injection volume, 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 be discharged through the venting gap-venting groove 120-injection groove 210-injection hole 112, ensuring complete venting inside the cell, thus not affecting the electrolyte injection volume and increasing the injection efficiency.

[0049] Furthermore, based on this, one end of the venting groove 120 extends to the outer edge of the cover plate body 100 (the end of the venting groove 120 is open), and the other end extends to the outer edge of the injection hole processing section 110. This not only simplifies the processing technology, but also results in a larger volume of the venting groove 120 and a larger cross-sectional area (air port cross-sectional area) of the venting groove 120 within the venting gap / injection groove 210, leading to high venting efficiency. As an example, the venting groove 120 can be formed by stamping.

[0050] In the embodiments of this application, such as Figure 3 As shown, the cover plate body 100 (e.g., a plain aluminum plate) includes a substrate, an injection hole processing portion 110 is formed on the substrate, and an venting groove 120 is formed on one side of the substrate facing the electrode assembly. Figure 3 and Figure 13 As shown, the injection hole processing part 110 can be formed by stamping. The injection hole processing part includes a protrusion 111 protruding on the side facing the electrode assembly formed by stamping, and an annular groove 113 naturally formed around the protrusion 111. One end of the venting groove 120 extends to the outer edge of the cover plate body 100, and the other end extends to the outer edge of the annular groove 113.

[0051] In the embodiments of this application, such as Figure 3As shown, the substrate includes a first step portion 131 and a second step portion 132 connected to each other from top to bottom. The cross-sectional area of ​​the second step portion 132 is smaller than that of the first step portion 131. The step surface formed at the connection between the second step portion 132 and the first step portion 131 is used for housing mounting. An exhaust groove 120 is opened on one side of the second step portion 132 facing the electrode assembly. One end of the exhaust groove 120 extends to the outer edge of the second step portion 132 (the end of the exhaust groove 120 is open), and the other end extends to the outer edge of the injection hole processing portion 110.

[0052] In embodiments of this application, the number of venting grooves 120 can be multiple, and the multiple venting grooves 120 are arranged around the injection hole 112, starting from the outer edge of the annular groove 113 and leading to the edge of the cover plate body 100. In embodiments of this application, as... Figures 2 to 7 As shown, the injection hole processing part 110 is provided at the end of the cover plate body 100, and the injection groove 210 is provided at the end of the first plastic part 200. Figure 7 and Figure 8 As shown, the cover body 100 includes two first sides opposite to each other in the width direction Y, and a second side in the length direction X. There are multiple exhaust channels 120, which are divided into three groups. At least one exhaust channel 120 is present in the first and second groups, with one end of each group extending to the two first sides. At least one exhaust channel 120 is present in the third group, with one end extending to the second side.

[0053] Preferably, such as Figure 7 and Figure 8 As shown, the first, second, and third groups each have one venting groove 120. The venting grooves 120 of the first and second groups extend along the width direction Y, and the center lines of the venting grooves 120 of the first and second groups, which are parallel to the width direction Y, intersect the axis of the injection hole 112. The venting groove 120 of the third group extends along the length direction X, and the center line of the venting groove 120 of the third group, which is parallel to the length direction X, intersects the axis of the injection hole 112. With this configuration, the length of the venting grooves 120 is minimized, meaning the venting path (venting gap - venting groove 120 - injection groove 210 - injection hole 112) is the fastest path, which can improve venting efficiency.

[0054] In the embodiments of this application, such as Figure 10 and Figure 11 As shown, the exhaust grooves in the first, second, and third groups satisfy the following condition: 0.2mm ≤ Hn ≤ 1.2mm, where Hn is the dimension (depth) of the exhaust groove in the thickness direction Z. With this setting, if 0.2mm > Hn, the exhaust efficiency is low and cannot meet the exhaust requirements; if Hn > 1.2mm, it will affect the structural strength of the cover plate body 100.

[0055] See also Figure 10 and Figure 11 The exhaust channels in the first, second, and third groups satisfy the following condition: 5% ≤ Hn / H ≤ 35%, where Hn is the dimension (depth) of the exhaust channel in the thickness direction Z, and H is the dimension (thickness) of the substrate in the thickness direction Z. With this setting, if 5% > Hn / H, the exhaust efficiency will be low and the exhaust requirements will not be met; if Hn / H > 35%, the structural strength of the cover plate body 100 will be affected.

[0056] In the embodiments of this application, such as Figure 9 As shown, the exhaust channels in the first and second groups satisfy the following condition: 1.0 ≤ M1 ≤ 5.0, where M1 is the dimension of the exhaust channel in the length direction X; the exhaust channels in the third group satisfy the following condition: 1.0 ≤ M2 ≤ 5.0, where M2 is the dimension of the exhaust channel in the width direction Y. That is, the width of the exhaust channels in the first, second, and third groups satisfies the condition: 1.0 ≤ exhaust channel width ≤ 5.0. With this configuration, if 1.0 > exhaust channel width, the exhaust efficiency will be low and the exhaust requirements will not be met. If the exhaust channel width > 5.0, there may be interference between the exhaust channels in the two directions, causing large-area material loss and affecting the structural strength of the cover plate body 100.

[0057] In the embodiments of this application, such as Figure 9 As shown, the first and second groups of venting grooves satisfy the following condition: M1 < D / 1.5, where M1 is the dimension of the venting groove in the length direction X, and D is the diameter of the injection hole machining part 110 (i.e., the diameter of the annular groove 113). The third group of venting grooves satisfies the following condition: M2 < D / 1.5, where M2 is the dimension of the venting groove in the width direction Y, and D is the diameter of the injection hole machining part 110 (i.e., the diameter of the annular groove 113). That is, the width of the venting grooves in the first, second, and third groups is < D / 1.5. With this arrangement, if the width of the venting groove is ≥ D / 1.5, there may be interference between the venting grooves in the two directions, causing a large area of ​​material loss and affecting the structural strength of the cover plate body 100.

[0058] In the embodiments of this application, such as Figure 9 As shown, the exhaust channels in the third group satisfy the following condition: 0.05 ≤ M2 / W ≤ 0.25, where M2 is the dimension of the exhaust channel in the width direction Y, and W is the dimension of the cover plate body 100 in the width direction Y. With this setting, if 0.05 > M2 / W, the exhaust efficiency will be low and the exhaust requirements will not be met; if M2 / W > 0.25, it will affect the structural strength of the cover plate body 100, and there may also be interference between the exhaust channels in the two directions.

[0059] In the embodiments of this application, such as Figure 12As shown, the bottom of the exhaust channels in the first, second, and third groups has a rounded transition corner to prevent fatigue cracks from easily occurring due to localized stress concentration under vibration. The radius R of the rounded transition corner satisfies: 0.1mm ≤ R ≤ 1.0mm. With this setting, if 0.1mm > R, the transition will be close to a sharp point, failing to effectively disperse stress; if R > 1.0mm, it will excessively encroach on the effective space of the channel, reducing the exhaust efficiency.

[0060] The test results of the exhaust channels of the first, second and third groups of this application are shown in Tables 1 and 2 below. The dimensions of the exhaust channels in the embodiments in Table 1 meet the above requirements, and the test results obtained also meet the requirements. The dimensions of the exhaust channels in the embodiments in Table 2 do not meet the above requirements, and the test results obtained also do not meet the requirements.

[0061] Table 1

[0062]

[0063] Table 2

[0064]

[0065] As shown in the table above, if the dimensions of the exhaust channels in the first, second, and third groups of this application meet the above requirements, the test results obtained will also meet the requirements; if the dimensions of the exhaust channels do not meet the above requirements, the test results obtained will also not meet the requirements.

[0066] The cover plate of this application adds an additional venting path to the existing venting path (injection guide hole 211 - injection groove 210 - injection hole 112). Specifically, an venting groove 120 is formed on the side of the cover plate body 100 facing the electrode assembly. One end of the venting groove 120 extends to the outer edge of the cover plate body 100, and the other end extends to the outer edge of the injection hole processing section 110, connecting the venting gap and the injection groove 210, thus forming a new additional venting path (venting gap - venting groove 120 - injection groove 210 - injection hole 112). With this configuration, when the injection guide hole 211 is blocked, such as... Figure 5 As shown, the gas inside the battery cell can be discharged through the venting gap-venting groove 120-injection groove 210-injection hole 112. Moreover, one end of the venting groove 120 extends to the outer edge of the cover plate body 100 (the end of the venting groove 120 is open), and the other end extends to the outer edge of the injection hole processing part 110. This not only simplifies the processing technology, but also makes the volume of the venting groove 120 and the cross-sectional area (air port cross-sectional area) of the venting groove 120 within the venting gap / injection groove 210 large, resulting in high venting efficiency.

[0067] Additionally, in the embodiments of this application, such as Figure 6 and Figure 7As shown, the middle region of the bottom wall 212 of the injection tank 210 of the first plastic part 200 is set directly opposite the injection hole 112. In order to prevent the electrolyte from impacting the electrode group and causing damage to the electrode sheet during the battery cell injection process, the middle region of the bottom wall 212 of this application is a solid region, and multiple injection guide holes 211 are provided around the solid region.

[0068] like Figure 2 As shown, the cover plate of this application also includes a pole post 500, a second plastic part 300 and a riveting block 400. The pole post 500 passes through the through holes of the first plastic part 200, the cover plate body 100, the second plastic part 300 and the riveting block 400 in sequence, and is riveted to the riveting block 400.

[0069] According to a second aspect of this application, an electrical device is provided, including the battery cell as described above.

[0070] 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. An electric cell, characterized by, The battery cell includes an electrode assembly, a cover plate, and a housing. The cover plate has a thickness direction and includes a cover plate body and a first plastic part connected to each other in the thickness direction. The first plastic part is connected to the side of the cover plate body facing the pole group, and along the thickness direction, the first plastic part and the cover plate body are projected onto a plane perpendicular to the thickness direction, and the projection outline of the first plastic part falls completely within the projection outline range of the cover plate body. The cover plate body includes a liquid injection hole processing part, the liquid injection hole processing part has a liquid injection hole that penetrates itself, the first plastic part includes a liquid injection groove corresponding to the liquid injection hole, and the bottom wall of the liquid injection groove has a liquid injection guide hole that penetrates itself. The housing is connected to the outer edge of the cover plate body corresponding to its projected outline, and there is an exhaust gap between the housing and the first plastic part. An exhaust groove is provided on the side of the cover plate body facing the electrode assembly. One end of the exhaust groove extends to the outer edge of the cover plate body, and the other end extends to the outer edge of the injection hole processing part to connect the exhaust gap and the injection groove.

2. The electric cell of claim 1, wherein, The injection hole processing part is located at the end of the cover plate body, and the injection groove is located at the end of the first plastic part; The cover plate also has a length direction and a width direction, wherein the length direction, the width direction and the thickness direction are perpendicular to each other; the cover plate body includes two first sides that are opposite to each other in the width direction, and a second side in the length direction; The number of exhaust slots is multiple, and the multiple exhaust slots are divided into three groups. The number of exhaust slots in the first group and the second group is at least one, and one end of the exhaust slots in the first group and the second group extends to the two first sides respectively. The number of exhaust slots in the third group is at least one, and one end of the exhaust slots in the third group extends to the second side.

3. The electric cell of claim 2, wherein, The number of exhaust slots in the first group, the second group, and the third group is one each; The first and second groups of venting grooves extend along the width direction, and the centerline of the first and second groups of venting grooves, which is parallel to the width direction, intersects the axis of the injection hole. The third group of venting grooves extends along the length direction, and the centerline of the third group of venting grooves, which is parallel to the length direction, intersects the axis of the injection hole.

4. The electric cell of any one of claims 1-3, wherein, The exhaust groove satisfies the following condition: 0.2mm≤Hn≤1.2mm, where Hn is the dimension of the exhaust groove in the thickness direction.

5. The battery cell according to any one of claims 1-3, characterized in that, The cover plate body includes a base plate, the liquid injection hole is formed on the base plate, and the venting groove is opened on the side of the base plate facing the electrode assembly; The venting groove satisfies: 5%≤Hn / H≤35%, where Hn is the dimension of the venting groove in the thickness direction and H is the dimension of the substrate in the thickness direction.

6. The battery cell according to claim 3, characterized in that, The exhaust slots of the first and second groups satisfy the following condition: 1.0mm≤M1≤5.0mm, where M1 is the dimension of the exhaust slot in the length direction; The exhaust groove of the third group satisfies: 1.0mm≤M2≤5.0mm, where M2 is the dimension of the exhaust groove in the width direction.

7. The battery cell according to claim 3, characterized in that, The first and second groups of venting grooves satisfy the following condition: M1 < D / 1.5, where M1 is the dimension of the venting groove in the length direction and D is the diameter of the injection hole machining part. The third group of venting grooves satisfies the following condition: M2 < D / 1.5, where M2 is the dimension of the venting groove in the width direction and D is the diameter of the injection hole machining part.

8. The battery cell according to claim 3, characterized in that, The exhaust groove of the third group satisfies: 0.05≤M2 / W≤0.25, where M2 is the dimension of the exhaust groove in the width direction and W is the dimension of the cover plate body in the width direction.

9. The battery cell according to claim 1, characterized in that, The bottom of the exhaust groove is provided with a transition fillet, and the radius R of the transition fillet satisfies: 0.1mm≤R≤1.0mm.

10. An electrical appliance, characterized in that, Includes the battery cell as described in any one of claims 1-9.

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