Cover plate, battery cell and electric equipment

Abstract

The invention relates to the technical field of batteries, in particular to a cover plate, a battery cell and electric equipment. 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; a liquid injection hole penetrating through the cover plate body is formed in the cover plate body, the first plastic part comprises an exhaust hole penetrating through the first plastic part and a liquid injection groove corresponding to the liquid injection hole, and a liquid injection flow guide hole penetrating through the first plastic part is formed in the bottom wall of the liquid injection groove; an exhaust groove is formed in the side, facing the first plastic part, of the cover plate body, one end of the exhaust groove extends to the exhaust hole, and the other end of the exhaust groove extends to the liquid injection groove so as to communicate the exhaust hole with the liquid injection groove. According to the battery cell structure, the problems that in an existing battery cell structure, electrolyte flow guide holes are generally formed below cover plate lower plastic cement to serve as exhaust holes to guide gas in the battery cell to the outside, but physical interference is easily formed between the insulating rubber tape on the surface of the pole group and the exhaust holes, then the exhaust holes are blocked, battery cell exhausting is not complete, and battery cell bulging is caused are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a cover plate, a battery cell and an electric device. BACKGROUND

[0002] In the production and manufacturing process of a battery, the pre-charging stage of a battery cell and the 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, interface reactions occur between the electrolyte and the electrode material, which inevitably produce trace amounts of gas. The baking process before liquid injection is aimed at removing moisture inside 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 trace amounts 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 below the plastic under the cover plate as an exhaust hole to guide the gas inside the battery cell to the outside to avoid the accumulation of gas inside the battery cell and cause the pressure to rise. However, during the assembly of the battery cell, the surface of the pole group is usually covered with an insulating tape. However, the insulating tape on the surface of the pole group is prone to positional deviation, wrinkles or excessive coverage, which causes the tape to form physical interference with the electrolyte flow guide hole set below the cover plate, thereby blocking the exhaust hole and causing the battery cell to swell due to incomplete exhaust. SUMMARY

[0004] The purpose of the present application is to provide a cover plate, a battery cell and an electric device, thereby solving the problem that the existing battery cell structure usually sets an electrolyte flow guide hole below the plastic under the cover plate as an exhaust hole to guide the gas inside the battery cell to the outside, but the insulating tape on the surface of the pole group is prone to form physical interference with the exhaust hole, thereby blocking the exhaust hole and causing the battery cell to swell due to incomplete exhaust.

[0005] According to a first aspect of the present application, a cover plate is provided, which comprises a cover plate body and a first plastic part; the first plastic part is connected to one side of the cover plate body; the cover plate body is provided with a liquid injection hole penetrating through itself, the first plastic part comprises an exhaust hole penetrating through itself and a liquid injection groove corresponding to the liquid injection hole, and the bottom wall of the liquid injection groove is provided with a liquid injection flow guide hole penetrating through itself; the side of the cover plate body facing the first plastic part is provided with an exhaust groove, one end of the exhaust groove extends to the exhaust hole, and the other end extends to the liquid injection groove to connect the exhaust hole and the liquid injection groove.

[0006] In any of the above technical solutions, further, the cover plate has a length direction, the injection hole is disposed at the end of the cover plate body, and the injection groove is disposed at the end of the first plastic part; the number of vent holes is at least one, the number of vent grooves is at least one, and the vent holes and vent grooves correspond one-to-one, and one end of the vent hole is connected to the corresponding vent groove; the vent holes and the injection grooves are arranged along the length direction, and the vent grooves and the injection holes are arranged along the length direction.

[0007] In any of the above technical solutions, the vent hole and the injection groove are further provided at intervals along the length direction, and the vent groove and the injection hole are provided at intervals along the length direction.

[0008] In any of the above technical solutions, the cover plate further has a thickness direction perpendicular to the length direction; the number of vent holes is one, and the number of vent grooves is one; the vent groove extends along the length direction, the centerline of the vent groove parallel to the length direction passes through the center of the injection hole, and along the thickness direction, the cross section of the vent groove perpendicular to the thickness direction completely covers the cross section of the vent hole perpendicular to the thickness direction.

[0009] In any of the above technical solutions, the middle region of the bottom wall of the injection tank is positioned directly opposite the injection hole, the middle region of the bottom wall is a solid structure, and there are multiple injection guide holes arranged circumferentially along the solid structure.

[0010] In any of the above technical solutions, the portion of the venting groove that communicates with the injection groove has a length dimension L of 0.5mm-1mm.

[0011] 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 satisfies: 0.5mm≤W≤3mm, where W is the dimension of the exhaust groove in the width direction.

[0012] In any of the above technical solutions, the cover plate further has a thickness direction; the exhaust groove satisfies: 0.1mm≤H≤0.5mm, where H is the dimension of the exhaust groove in the thickness direction.

[0013] According to a second aspect of this application, a battery cell is provided, including the cover plate as described above.

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

[0015] The cover plate of this application includes a cover plate body and a first plastic part, the first plastic part being connected to one side of the cover plate body; the cover plate body has a through-hole for liquid injection, the first plastic part includes a through-hole for venting and a liquid injection groove corresponding to the liquid injection hole, the bottom wall of the liquid injection groove has a through-hole for liquid injection guide; the side of the cover plate body facing the first plastic part has a vent groove, one end of the vent groove extending to the vent hole and the other end extending to the liquid injection groove, so as to connect the vent hole and the liquid injection groove.

[0016] Based on the above technical features, the beneficial effects of this application are as follows: The battery 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 hole is opened through the first plastic part, and an venting groove is opened on the side of the cover body facing the first plastic part. One end of the venting groove extends to the venting hole, and the other end extends to the injection tank to connect the venting hole and the injection tank, thereby forming a new additional venting path (venting hole - venting groove - injection tank - injection hole). With this configuration, when the injection guide hole is blocked, the gas inside the battery cell can pass through the venting hole - venting groove - injection tank - injection hole, thus avoiding the problem of battery cell swelling caused by incomplete 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 A top view of the cover plate according to an embodiment of this application is shown; Figure 2 Show Figure 1 A schematic diagram of the AA cross-sectional structure; Figure 3 Show Figure 2 Partial structural diagram; Figure 4 A schematic diagram of the exhaust path of an embodiment of this application is shown; Figure 5 A schematic diagram showing the dimensions of the exhaust channel according to an embodiment of this application; Figure 6 A schematic diagram of the structure of a first plastic part according to an embodiment of this application is shown; Figure 7 ShowFigure 6 Top view; Figure 8 A schematic diagram of the cover plate body according to an embodiment of this application is shown; Figure 9 Show Figure 8 Top view.

[0020] Icons: 100-Cover plate body; 110-Injection hole; 120-Ventilation groove; 200-First plastic part; 210-Injection groove; 211-Injection guide hole; 212-Bottom wall; 220-Ventilation hole; 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 cover plate, thereby solving the problem that in existing battery cell structures, electrolyte drainage holes are typically provided under the plastic of the cover plate 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 can easily form physical interference, thereby blocking the venting holes and causing incomplete venting of the battery cell, resulting in battery cell swelling. 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 Figure 1 and Figure 2 As shown, the cover plate of this application includes a cover plate body 100 (e.g., a plain aluminum plate) and a first plastic part 200, the first plastic part 200 being connected to one side of the cover plate body 100; as Figures 2 to 9 As shown, the cover plate body 100 has a through-hole injection hole 110, the first plastic part 200 includes a through-hole vent 220 and an injection groove 210 corresponding to the injection hole 110, and the bottom wall 212 of the injection groove 210 has a through-hole injection guide hole 211; the side of the cover plate body 100 facing the first plastic part 200 has a vent groove 120, one end of the vent groove 120 extends to the vent hole 220, and the other end extends to the injection groove 210 to connect the vent hole 220 and the injection groove 210.

[0032] With this configuration, the battery cell cover of this application adds an additional venting path to the existing venting path (injection guide hole 211-injection groove 210-injection hole 110). Specifically, a through-hole vent 220 is formed on the first plastic part 200, and a venting groove 120 is formed on the side of the cover body 100 facing the first plastic part 200. One end of the venting groove 120 extends to the venting hole 220, and the other end extends to the injection groove 210, connecting the venting hole 220 and the injection groove 210, thus forming a new additional venting path (venting hole 220-venting groove 120-injection groove 210-injection hole 110). With this configuration, when the injection guide hole 211 is blocked, the gas inside the battery cell can pass through the venting hole 220-venting groove 120-injection groove 210-injection hole 110, thus avoiding the problem of incomplete venting causing battery cell swelling. Figure 4 As shown.

[0033] In the embodiments of this application, such as Figures 5 to 8As shown, the injection hole 110 is located at the end of the cover plate body 100, and the injection groove 210 is located at the end of the first plastic part 200; there is at least one vent hole 220 and at least one vent groove 120, and the vent hole 220 and the vent groove 120 correspond one-to-one, with one end of the vent hole 220 connected to one end of the corresponding vent groove 120; the vent hole 220 and the injection groove 210 are arranged along the length direction X, and the vent groove 120 and the injection hole 110 are arranged along the length direction X. With this arrangement, the injection hole 110 and the 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 structural layout and avoiding complex processing steps caused by structural intersections.

[0034] Preferably, such as Figures 6 to 9 As shown, the vent hole 220 and the injection groove 210 are spaced apart along the length direction X, and the vent groove 120 and the injection hole 110 are spaced apart along the length direction X. This arrangement prevents interference between the vent hole 220 and the injection groove 210, or between the vent groove 120 and the injection hole 110, during processing, thereby reducing the compressive and impact resistance of the cover plate body 100 and the first plastic part 200.

[0035] Preferably, in the embodiments of this application, such as Figures 6 to 9 As shown, there is one vent hole 220 and one vent groove 120. The vent groove 120 extends along the length direction X, and its centerline, parallel to the length direction X, passes through the center of the injection hole 110. Along the thickness direction Z, the cross-section of the vent groove 120 perpendicular to the thickness direction Z completely covers the cross-section of the vent hole 220 perpendicular to the thickness direction Z. With this configuration, the length of the vent groove 120 is minimized, meaning the venting path (vent hole 220 - vent groove 120 - injection groove 210 - injection hole 110) is the fastest path, which improves venting efficiency.

[0036] In the embodiments of this application, such as Figure 5 As shown, the portion of the venting groove 120 that connects to the injection groove 210 has a length dimension L of 0.5mm-1mm in the X direction. 0.5mm≤L≤1mm. If L<0.5mm, the venting efficiency is low and cannot meet the venting requirements. If L>1mm, there will be a positioning deviation during the assembly process of the first plastic part 200 and the cover plate body 100, which may easily interfere with the venting hole 220, thus causing the venting groove 120 and the venting hole 220 to not be connected.

[0037] In the embodiments of this application, such as Figure 9As shown, the venting groove 120 satisfies the following condition: 0.5mm ≤ W ≤ 3mm, where W is the dimension of the venting groove 120 in the width direction Y. If W < 0.5mm, the venting efficiency is low and cannot meet the venting requirements; if W > 3mm, the width of the venting groove 120 is too large, affecting the structural strength of the cover plate body 100. Similarly, the dimension of the venting hole 220 in the width direction Y is equal to the dimension of the venting groove 120 in the width direction Y. If the width of the venting hole 220 is too small, the venting efficiency is low and cannot meet the venting requirements; if the width of the venting hole 220 is too large, it affects the structural strength of the first plastic part 200.

[0038] Example data is as follows:

[0039] As mentioned above, when 0.5mm≤L≤1mm and 0.5mm≤W≤3mm, the battery cell did not bulge, and the structural strength of the cover plate met the requirements.

[0040] In the embodiments of this application, such as Figure 5 As shown, the exhaust groove 120 satisfies the following condition: 0.1mm ≤ H ≤ 0.5mm, where H is the dimension (depth) of the exhaust groove 120 in the thickness direction Z. With this setting, if 0.1mm > H, the exhaust efficiency is low and cannot meet the exhaust requirements; if H > 0.5mm, it will affect the structural strength of the cover plate body 100.

[0041] Additionally, in the embodiments of this application, such as Figure 3 and Figure 7 As 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 110. 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.

[0042] In summary, the battery cell cover of this application adds an additional venting path to the existing venting path (injection guide hole 211-injection groove 210-injection hole 110). Specifically, a through-hole vent 220 is formed on the first plastic part 200, and a venting groove 120 is formed on the side of the cover body 100 facing the first plastic part 200. One end of the venting groove 120 extends to the venting hole 220, and the other end extends to the injection groove 210, connecting the venting hole 220 and the injection groove 210, thus forming a new additional venting path (venting hole 220-venting groove 120-injection groove 210-injection hole 110). With this configuration, when the injection guide hole 211 is blocked, the gas inside the battery cell can pass through the venting hole 220-venting groove 120-injection groove 210-injection hole 110, thus avoiding the problem of incomplete venting causing battery cell swelling. Figure 4 As shown.

[0043] In addition, the cover plate of this application also includes a pole post, a second plastic part and a riveting block. The pole post passes through the through holes of the first plastic part 200, the cover plate body 100, the second plastic part and the riveting block in sequence, and is riveted to the riveting block.

[0044] According to a second aspect of this application, a battery cell is provided, including a cover plate as described above. The battery cell also includes a housing connected to the outer edge of the cover plate body 100, and an electrode assembly disposed inside the housing.

[0045] According to a third aspect of this application, an electrical device is provided, including the battery cell described above.

[0046] 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 cover plate, characterized in that, The cover plate includes a cover plate body and a first plastic component; the first plastic component is connected to one side of the cover plate body. The cover plate body has a liquid injection hole that penetrates through itself. The first plastic part includes a vent hole that penetrates through itself and a liquid injection groove corresponding to the liquid injection hole. The bottom wall of the liquid injection groove has a liquid injection guide hole that penetrates through itself. The cover plate body has an exhaust groove on the side facing the first plastic part. One end of the exhaust groove extends to the exhaust hole, and the other end extends to the injection groove to connect the exhaust hole and the injection groove.

2. The cover plate according to claim 1, characterized in that, The cover plate has a length direction, the injection hole 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 number of exhaust holes is at least one, the number of exhaust grooves is at least one, and the exhaust holes and exhaust grooves correspond one-to-one, with one end of the exhaust hole connected to one end of the corresponding exhaust groove; The vent hole and the injection groove are arranged along the length direction.

3. The cover plate according to claim 2, characterized in that, The vent hole and the injection tank are spaced apart along the length direction, and the vent tank and the injection hole are spaced apart along the length direction.

4. The cover plate according to claim 2, characterized in that, The cover plate also has a thickness direction perpendicular to the length direction; the number of vent holes is one, and the number of vent grooves is one; The venting groove extends along the length direction, the centerline of the venting groove parallel to the length direction passes through the center of the injection hole, and the cross section of the venting groove perpendicular to the thickness direction completely covers the cross section of the venting hole perpendicular to the thickness direction.

5. The cover plate according to claim 1, characterized in that, The middle region of the bottom wall of the injection tank is directly opposite the injection hole. The middle region of the bottom wall is a solid structure. There are multiple injection guide holes, which are arranged circumferentially along the solid structure.

6. The cover plate according to claim 4, characterized in that, The portion of the venting groove that communicates with the injection groove has a length dimension L of 0.5mm-1mm.

7. The cover plate according to claim 4, 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 exhaust groove satisfies the following condition: 0.5mm≤W≤3mm, where W is the dimension of the exhaust groove in the width direction.

8. The cover plate according to any one of claims 1-7, characterized in that, The cover plate has a thickness direction; The exhaust groove satisfies the following condition: 0.1mm≤H≤0.5mm, where H is the dimension of the exhaust groove in the thickness direction.

9. A battery cell, characterized in that, Includes the cover plate as described in any one of claims 1-8.

10. An electrical appliance, characterized in that, Includes the battery cell as described in claim 9.

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