Battery cell cover plate and battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell cover plate and a battery cell. The battery cell cover plate comprises a cover plate main body provided with a mounting hole; the pole column comprises a material expanding part, a first column body part, a second column body part and a connecting part which are sequentially arranged in the axial direction, the first column body part is arranged in the mounting hole, and the size of the second column body part in the length direction of the cover plate is larger than that of the second column body part in the width direction of the cover plate; the shape of the cross section, perpendicular to the axial direction, of the second cylinder part is different from that of the cross section, perpendicular to the axial direction, of the expansion part, and the shape of the cross section, perpendicular to the axial direction, of the first cylinder part is the same as that of the cross section, perpendicular to the axial direction, of the expansion part; and the riveting piece is riveted with the pole. According to the utility model, the cross sectional area of the second column body part is increased, the overcurrent capacity of the pole is improved, the quick charging requirement of a battery cell is met, the temperature rise is prevented from being too high, the use safety of the battery cell is ensured, the material expansion part is not influenced by the second column body part with the increased cross sectional area, and the uniform material expansion of the pole and the riveting strength are ensured when the pole is riveted with a riveting piece.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cover and a battery. Background Art

[0002] As lithium-ion battery technology matures, it's widely used as a power battery in electric vehicles and energy storage applications, leading to increasing demands for performance and safety. The lithium-ion battery cover is a key component in lithium-ion batteries, welding to the battery case to form a sealed cavity, extracting the positive and negative electrodes, and serving as an assembly carrier.

[0003] Traditional cover plates consist of a rivet block, a pole, and a top cover. The pole is riveted to the rivet block to form the cover. The reliability of the connection between the pole and the rivet block determines the stress on the pole and the required strength of the cover. Existing poles struggle to balance current handling capacity with the reliability of their connection to the rivet block. Impacts can cause the rivet block to fall off, or the battery cell's current handling capacity to fail to meet fast charging requirements, leading to excessive temperature rise and unsafe battery cell operation. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a battery cell cover and a battery cell to solve the problem in the existing battery cell cover that the current carrying capacity of the pole and the connection strength with the rivet block cannot be achieved at the same time.

[0005] A first aspect of the present invention provides a cell cover, wherein the cell cover comprises:

[0006] The cover plate body is provided with a mounting hole;

[0007] The electrode comprises a bulging portion, a first column portion, a second column portion, and a connecting portion arranged in sequence along the axial direction, the second column portion being disposed in the mounting hole, the second column portion having a dimension in the length direction of the cell cover plate being greater than the dimension in the width direction of the cell cover plate, the cross-section of the second column portion perpendicular to the axial direction being different from the cross-section of the bulging portion perpendicular to the axial direction, and the cross-section of the first column portion perpendicular to the axial direction being the same as the cross-section of the bulging portion perpendicular to the axial direction;

[0008] The rivet piece is provided with a rivet hole, and the expanding portion and the first column portion are passed through the rivet hole, so that the pole and the rivet piece are riveted.

[0009] Preferably, the cross section of the bulging portion perpendicular to the axial direction is circular, and the second column portion is formed into a strip structure extending along the length direction of the battery cell cover.

[0010] Preferably, the circumferential side walls of the second cylindrical portion are smoothly transitioned and connected.

[0011] Preferably, after riveting, the cross-sectional area of the second column portion is greater than the cross-sectional area of the swelling portion and greater than the cross-sectional area of the first column portion.

[0012] Preferably, the central axis of the cross section of the first column portion, the central axis of the cross section of the second column portion, and the central axis of the cross section of the expanding portion coincide with each other.

[0013] Preferably, the rivet hole is formed as a stepped hole structure including a first stepped section and a second stepped section, the material expansion portion is arranged at the first stepped section, and the first column portion is arranged at the second stepped section.

[0014] Preferably, the connecting portion is arranged on a side of the cover plate body facing the interior of the battery cell; the bulging portion and the first column portion are arranged on a side of the cover plate body facing the exterior of the battery cell.

[0015] Preferably, it also includes:

[0016] A sealing member is sleeved on the circumferential side wall of the second column portion, and a portion of the sealing member is sandwiched between the connecting portion and the cover plate body.

[0017] Preferably, it also includes:

[0018] a first insulating member disposed between the rivet member and the cover plate body, wherein a portion of the first insulating member is disposed around a circumferential side wall of the rivet member;

[0019] The second insulating member is arranged on a side of the cover body facing the interior of the battery cell.

[0020] A second aspect of the present invention provides a battery cell, comprising the battery cell cover plate described in any of the above technical solutions.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] In the battery cell cover of the present invention, the second column portion is a structure in which the dimension in the length direction of the battery cell cover is larger than the dimension in the width direction of the battery cell cover. This increases the cross-sectional area of the second column portion, improves the current capacity of the pole, meets the fast charging requirements of the battery cell, avoids excessive temperature rise, and ensures the safety of the battery cell. On this basis, the cross-section of the second column portion perpendicular to the axial direction is different from the cross-sectional shape of the bulging portion perpendicular to the axial direction, and the cross-sectional shape of the first column portion perpendicular to the axial direction is the same as the cross-sectional shape of the bulging portion perpendicular to the axial direction. In this way, the bulging portion is not affected by the second column portion with an increased cross-sectional area, and when the pole and the rivet are riveted, the pole is ensured to be evenly and fully bulged, thereby ensuring the riveting strength, avoiding the rivet falling off when the battery cell cover is impacted, and thereby improving the service life of the battery cell.

[0023] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A schematic structural diagram of a cell cover provided in an embodiment of the present utility model;

[0026] Figure 2 A schematic structural diagram of a cell cover provided by an embodiment of the present utility model from another perspective;

[0027] Figure 3 For the Figure 2 Cross-section taken at AA in the middle;

[0028] Figure 4 For the Figure 2 Cross-section taken at BB in the middle;

[0029] Figure 5 A schematic diagram of the structure of the pole in the battery cover provided by an embodiment of the utility model;

[0030] Figure 6 A schematic structural diagram of a pole in a cell cover provided by an embodiment of the present invention from another perspective;

[0031] Figure 7 This is a schematic structural diagram of the pole in the battery cover provided by an embodiment of the present invention from another perspective.

[0032] Icons: 10-cover body; 11-mounting hole; 12-liquid injection hole; 20-pole; 21-inflating part; 22-first column part; 23-second column part; 24-connecting part; 30-rivet; 31-rivet hole; 311-first step section; 312-second step section; 40-sealing part; 50-first insulating part; 60-second insulating part. DETAILED DESCRIPTION

[0033] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent upon 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. Rather, except for operations that must occur in a particular order, changes may be made that will be apparent upon understanding the disclosure of this application. Furthermore, descriptions of features known in the art may be omitted for clarity and brevity.

[0034] 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 possible ways to implement the methods, devices, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0035] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, it may be directly “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on,” “directly connected to,” “directly coupled to,” “directly over,” or “directly covering” another element, there may be no other elements intervening therebetween.

[0036] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0037] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are used only to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Thus, a first member, component, region, layer, or portion in the examples described herein may also be referred to as a second member, component, region, layer, or portion without departing from the teachings of the examples.

[0038] For ease of description, spatial relational terms such as "above," "upper," "below," and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element would subsequently be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientations "above" and "below," 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 relational terms used herein will be interpreted accordingly.

[0039] The terms used herein are intended only to describe various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular is intended to include the plural. The terms "comprise," "include," and "have" list the presence of stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0040] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include changes in shapes that occur during manufacturing.

[0041] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0042] According to a first aspect of the present invention, a cell cover is provided, which specifically includes a cover body 10 , a pole 20 and a rivet 30 .

[0043] Hereinafter, the specific structure of the cell cover plate as described above according to this embodiment will be described.

[0044] In this embodiment, if Figures 1 to 4 As shown, the cover body 10 is formed into a plate-like structure; when the battery cell is a square shell battery cell or a blade battery cell, the cover body 10 is a rectangular plate-like structure; when the battery cell is a cylindrical battery cell, the cover body 10 is a circular plate-like structure, and a mounting hole 11 is opened on the cover body 10, and the mounting hole 11 is formed into a through-hole structure that penetrates the cover body 10.

[0045] In addition, in an optional embodiment, as Figures 1 to 3 As shown, the cover body 10 is further provided with an injection hole 12, through which electrolyte can be injected into the battery cell after the battery cell is assembled. In an optional embodiment, the cover body 10 is further provided with an exhaust hole, which is equipped with an explosion-proof valve. When the battery cell fails and produces gas to a preset pressure, it opens to discharge the gas inside the battery cell and alleviate the battery cell failure.

[0046] In this embodiment, if Figures 1 to 7 As shown, the pole 20 includes a rising portion 21, a first column portion 22, a second column portion 23 and a connecting portion 24 arranged in sequence along the axial direction, wherein the rising portion 21, the first column portion 22 and the second column portion 23 are all formed into a block structure, and the connecting portion 24 is formed into a plate structure arranged parallel to the cover body 10, and the second column portion 23 is arranged in the mounting hole 11, and the rising portion 21 and the first column portion 22 are arranged on the side of the cover body 10 facing the outside of the battery cell, and the rising portion 21 and the first column portion 22 extend from one side of the cover body 10 for connecting to the bus outside the battery cell; the connecting portion 24 is arranged on the side of the cover body 10 facing the inside of the battery cell, and the connecting portion 24 extends from the other side of the cover body 10 for connecting to the pole ear on the pole group inside the battery cell.

[0047] In this embodiment, if Figures 1 to 4 As shown, the rivet 30 is formed into a block structure, for example, a rectangular block structure, and a rivet hole 31 is opened on the rivet 30. The rivet hole 31 is a through-hole structure that passes through the rivet 30. The expanding portion 21 and the first column portion 22 are passed through the rivet hole 31. Before riveting, the radial dimension of the expanding portion 21 is the same as the radial dimension of the first column portion 22; after riveting, the circumferential side wall of the expanding portion 21 expands radially outward, so that the pole 20 and the rivet 30 are riveted.

[0048] It should be noted that, in this embodiment, radial direction only refers to the direction perpendicular to the axial direction. Figure 7 The vertical direction of the viewing angle does not necessarily mean that the cross section perpendicular to the axial direction is necessarily circular. In addition, the cross section is expressed as a section perpendicular to the axial direction.

[0049] Specifically, in this embodiment, Figures 5 to 7As shown, the size of the second column portion 23 in the length direction of the cover (i.e., the length direction of the battery cell cover) is larger than the size of the second column portion 23 in the width direction of the cover (i.e., the width direction of the battery cell cover). In this way, the cross-sectional area of the second column portion 23 is increased, the current capacity of the pole 20 is improved, the fast charging demand is met, excessive temperature rise is avoided, and the safety of the battery cell is ensured. In addition, the cross-section of the second column portion 23 perpendicular to the axial direction is different from the cross-section of the expanded portion 21 perpendicular to the axial direction, and the cross-section of the first column portion 22 perpendicular to the axial direction is the same as the cross-section of the expanded portion 21 perpendicular to the axial direction. In this way, the expanded portion 21 is not affected by the second column portion 23 with an increased cross-sectional area, and the pole 20 is ensured to be evenly and fully expanded when the pole 20 is riveted to the rivet 30, thereby ensuring the riveting strength between the rivet 30 and the pole 20, avoiding the rivet 30 from falling off when the battery cover is impacted, thereby improving the service life of the battery cover, so that the pole 20 on the battery cover meets both the overcurrent capacity requirements and the connection strength requirements.

[0050] In a preferred embodiment, Figures 5 to 7 As shown, the cross-section of the rising portion 21 perpendicular to the axial direction is circular, so that the rising portion 21 can expand outward evenly after riveting to ensure that the expanded material is full, thereby further improving the connection reliability between the pole 20 and the rivet 30 and avoiding the rivet 30 from falling off; further, the second column portion 23 is formed into a strip structure extending along the length direction of the battery cover, so as to adapt to the layout space of the battery cover, which can effectively increase the cross-sectional area of the second column portion 23 without interfering with other components in the battery cover.

[0051] In this embodiment, the surface of the rivet 30 facing the cover plate body 10 abuts against the surface of the second column portion 23 facing the rivet 30 .

[0052] In a preferred embodiment, the circumferential sidewalls of the second column portion 23 are smoothly transitioned to avoid sharp corners on the circumference of the second column portion 23, thereby preventing wear on the seal 40 described below. The cross-section of the second column portion 23 can be a racetrack-shaped structure with a central rectangle and semicircular sides, an elliptical structure, or a rectangular structure with curved chamfers at the four corners.

[0053] In this embodiment, if Figure 3 and Figure 4As shown, the rivet hole 31 is formed as a stepped hole structure including a first step section 311 and a second step section 312. The second step section 312 is arranged on the side facing the cover plate body 10. The radial dimension of the first step section 311 is greater than the radial dimension of the second step section 312. The rising portion 21 is arranged on the first step section 311, and the first column portion 22 is arranged on the second step section 312. Before riveting, the radial dimensions of the rising portion 21 and the first column portion 22 are the same, thereby ensuring that the rising portion 21 can extend into the first step section 311 through the second step section 312. After riveting, the radial dimension of the rising portion 21 increases to abut against the step between the first step section 311 and the second step section 312, thereby achieving riveting.

[0054] In addition, in this embodiment, Figure 3 and Figure 4 As shown, a third step section is further provided on the side of the first step section 311 facing away from the second step section 312. The radial dimension of the third step section is greater than the radial dimension of the first step section 311. The pole 20 and the rivet 30 are first riveted and then welded. The third step section can avoid welding, meet the welding process requirements, and ensure the welding strength and the flatness of the rivet 30 after welding.

[0055] In this embodiment, if Figures 5 to 7 As shown, after riveting, the cross-sectional area of the second column portion 23 is greater than the cross-sectional area of the rising portion 21 and greater than the cross-sectional area of the first column portion 22, thereby ensuring that the cross-sectional area of the second column portion 23 is the largest among the three, thereby improving the current-carrying capacity of the pole 20, and making the second column portion 23 protrude outward from the circumferential side wall of the first column portion 22 and abut against the rivet 30 to limit the position of the rivet 30; the cross-sectional area of the rising portion 21 is greater than the cross-sectional area of the first column portion 22 to ensure that the pole 20 and the rivet 30 are reliably riveted.

[0056] In this embodiment, the circumferential side wall of the first column portion 22 is gap-fitted with the second step section 312 , and the circumferential side wall of the riveted rising portion 21 is gap-fitted with the first step section 311 , thereby ensuring convenient and reliable assembly.

[0057] In this embodiment, if Figure 6 and Figure 7 As shown, the axis of the cross section of the first column portion 22, the axis of the cross section of the second column portion 23 and the axis of the cross section of the expanding portion 21 coincide with each other, so that the first column portion 22 and the expanding portion 21 are both arranged in the middle position of the second column portion 23, ensuring the structural strength of the pole 20, and the first column portion 22 is arranged in the middle position of the expanding portion 21 after riveting, ensuring uniform expansion and improving the riveting strength.

[0058] In addition, in this embodiment, Figure 1 and Figure 2As shown, multiple poles 20 are provided, and the rivet holes 31 on the rivet 30 are arranged one-to-one with the poles 20. The multiple poles 20 are arranged in an interval along the length of the cover body 10, and the connection portions 24 of adjacent poles 20 are spaced apart. The multiple poles 20 on the battery cover can be all positive, all negative, or some positive and the rest negative. The length of the cover body 10 is the length of the battery cover.

[0059] In this embodiment, if Figure 3 and Figure 4 As shown, the cell cover further includes a seal 40, a first insulating member 50, and a second insulating member 60. The seal 40 is a compressible seal ring, such as a seal ring made of fluororubber. The seal 40 is sleeved on the circumferential side wall of the second column portion 23, so that part of the seal 40 is sandwiched between the hole wall of the mounting hole 11 and the circumferential side wall of the second column portion 23, and part of the seal 40 is sandwiched between the connecting portion 24 and the cover body 10, thereby ensuring the assembly sealing of the cell cover.

[0060] like Figures 1 to 4 As shown, the first insulating member 50 and the second insulating member 60 are made of insulating materials, such as PP (polypropylene), PPS (polyphenylene sulfide), LCP (liquid crystal polymer), etc., to play an insulating role. Specifically, the first insulating member 50 is arranged between the rivet 30 and the cover body 10 to separate the rivet 30 and the pole 20 from the cover body 10, ensure the insulation of the cover body 10, and avoid overlapping and causing short circuits; wherein part of the first insulating member 50 is arranged around the circumferential side wall of the rivet 30, thereby improving the insulation reliability. More specifically, the second insulating member 60 is arranged on the side of the cover body 10 facing the interior of the battery cell, and at least part of the second insulating member 60 is covered on the circumferential side wall of the connecting portion 24 to separate the pole 20 and the pole group inside the battery cell from the cover body 10 and the battery cell shell, ensure the insulation performance of the battery cell shell and the cover body 10, and improve the safety of the battery cell.

[0061] According to a battery cell cover provided by the present invention, the second column portion is a structure in which the size in the length direction of the battery cell cover is larger than the size in the width direction of the battery cell cover, thereby increasing the cross-sectional area of the second column portion, improving the current capacity of the pole, meeting the fast charging requirements, avoiding excessive temperature rise, and ensuring the safety of the battery cell. On this basis, the cross-section of the second column portion perpendicular to the axial direction is different from the cross-sectional shape of the bulging portion perpendicular to the axial direction, and the cross-sectional shape of the first column portion perpendicular to the axial direction is the same as the cross-sectional shape of the bulging portion perpendicular to the axial direction, so that the bulging portion is not affected by the second column portion with an increased cross-sectional area, and when the pole and the rivet are riveted, the pole is guaranteed to be evenly and full of bulging material, thereby ensuring the riveting strength, avoiding the rivet falling off when the battery cell cover is impacted, and thereby improving the service life of the battery cell cover.

[0062] A battery cell provided by the present invention includes the battery cell cover plate as described above, and thus has all the beneficial effects of the battery cell cover plate, which will not be described in detail here.

[0063] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The scope of protection of the present application is not limited thereto. Although the present application has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed in the present application, or perform equivalent replacements for some of the technical features thereof. These modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the scope of protection of the claims.

Claims

1. A battery cover, characterized in that: The battery cover comprises: The cover plate body is provided with a mounting hole; The electrode comprises a bulging portion, a first column portion, a second column portion, and a connecting portion arranged in sequence along the axial direction, the second column portion being disposed in the mounting hole, the second column portion having a dimension in the length direction of the cell cover plate being greater than the dimension in the width direction of the cell cover plate, the cross-section of the second column portion perpendicular to the axial direction being different from the cross-section of the bulging portion perpendicular to the axial direction, and the cross-section of the first column portion perpendicular to the axial direction being the same as the cross-section of the bulging portion perpendicular to the axial direction; The rivet piece is provided with a rivet hole, and the expanding portion and the first column portion are passed through the rivet hole, so that the pole and the rivet piece are riveted.

2. The cell cover according to claim 1, characterized in that: The cross section of the bulging portion perpendicular to the axial direction is circular, and the second column portion is formed into a strip structure extending along the length direction of the battery cell cover.

3. The cell cover according to claim 1, wherein: The circumferential side walls of the second column portion are smoothly transitioned and connected.

4. The cell cover according to claim 1, wherein: After riveting, the cross-sectional area of the second column portion is greater than the cross-sectional area of the swelling portion and greater than the cross-sectional area of the first column portion.

5. The battery cell cover according to claim 1, characterized in that: The central axis of the cross section of the first column portion, the central axis of the cross section of the second column portion, and the central axis of the cross section of the expanding portion coincide with each other.

6. The cell cover according to claim 1, characterized in that: The rivet hole is formed as a stepped hole structure including a first stepped section and a second stepped section. The rising portion is arranged at the first stepped section, and the first column portion is arranged at the second stepped section.

7. The battery cell cover according to claim 1, characterized in that: The connecting portion is arranged on a side of the cover plate body facing the inside of the battery cell; the bulging portion and the first column portion are arranged on a side of the cover plate body facing the outside of the battery cell.

8. The cell cover according to claim 1, characterized in that: Also includes: A sealing member is sleeved on the circumferential side wall of the second column portion, and a portion of the sealing member is sandwiched between the connecting portion and the cover plate body.

9. The battery cell cover according to claim 1, characterized in that: Also includes: a first insulating member disposed between the rivet member and the cover plate body, wherein a portion of the first insulating member is disposed around a circumferential side wall of the rivet member; The second insulating member is arranged on a side of the cover body facing the interior of the battery cell.

10. A battery cell, characterized in that: The battery cell cover comprises the battery cell cover according to any one of claims 1 to 9.

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