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 pole and a cover plate, wherein the pole comprises a pole body part and a plate body part, and the pole body part penetrates through a mounting hole of a cover plate main body; the terminal post is riveted with the riveting piece, so that the circumferential side wall of part of the post body part expands outwards to form a material expansion part; the section, perpendicular to the axis of the pole, of the pole forms a strip-shaped structure, K is equal to (1 / 3-2 / 3) L, and M is equal to (1 / 3-2 / 3) W. The section, perpendicular to the axis of the pole, of the pole is of the strip-shaped structure, so that compared with a traditional cylindrical pole structure, the pole has the advantages that the overflowing capacity is improved, and the size proportion relation between the pole body part and the plate body part of the pole is defined as K = (1 / 3-2 / 3) L and M = (1 / 3-2 / 3) W, so that the overflowing capacity of the pole is effectively improved; and the structural strength of the cover plate main body is not influenced by the opening size of the mounting hole, so that the structural strength of the battery cell cover plate meets the battery cell use requirement.

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] With the increasing demand for fast charging and overcurrent capacity of batteries, the cylindrical pole structure can no longer meet the fast charging requirements of 4C, 5C, or even 6C. Therefore, it is necessary to increase the area of the pole to increase the overcurrent capacity. However, simply increasing the rod diameter of the circular pole can increase the overcurrent, but for example, in blade batteries, the thickness of the entire battery is relatively small. Increasing the rod diameter of the circular pole is affected by the thickness of the entire battery, and the effect of increasing the area is not obvious, and the cost is high. In addition, increasing the rod diameter of the pole will correspondingly increase the size of the opening on the top cover, thereby affecting the structural strength of the top cover and failing to ensure the safety of the battery cell. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery cell cover and a battery cell to solve the problem that the existing battery cell cover cannot ensure the structural strength of the top cover by increasing the rod diameter of the pole to increase the current carrying capacity of the pole, thereby affecting the safety performance of the battery cell.

[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 pole comprises a column portion and a plate portion sequentially arranged along the axial direction of the pole, the column portion is passed through the mounting hole, and the plate portion is arranged on a side of the cover body facing the interior of the battery cell;

[0008] A rivet having a rivet hole, wherein one end of the column away from the plate portion is passed through the rivet hole, and the pole is riveted to the rivet so that a portion of the circumferential side wall of the column portion expands outward to form a bulging portion;

[0009] The cross section of the pole perpendicular to its axis is formed into a strip structure, K = (1 / 3 to 2 / 3) L, M = (1 / 3 to 2 / 3) W;

[0010] Among them, K is the maximum length dimension of the column part before riveting, in mm; M is the maximum width dimension of the column part before riveting, in mm; L is the length dimension of the plate part, in mm; W is the width dimension of the plate part, in mm.

[0011] Preferably, the height dimension of the plate portion in the axial direction of the pole is h, 1mm≤h≤3mm.

[0012] Preferably, the column portion includes a first column portion and a second column portion arranged along the axial direction of the pole, the second column portion is arranged between the plate portion and the first column portion, and the expanding portion is formed by expanding outward a portion of the circumferential side wall of the first column portion.

[0013] Preferably, 0.5 mm ≤ KA ≤ 2 mm, K is the maximum length of the second column portion before riveting, and A is the maximum length of the first column portion before riveting.

[0014] Preferably, 0.5 mm ≤ MB ≤ 2 mm; M is the maximum width of the second column portion before riveting, and B is the maximum width of the first column portion before riveting.

[0015] Preferably, the rivet hole is formed as a stepped hole structure including a first step section, a second step section and a third step section, the first step section, the second step section and the third step section are arranged sequentially along the axial direction of the rivet hole, and the end of the rising portion facing the cover plate body abuts against the boss between the second step section and the third step section.

[0016] Preferably, it also includes:

[0017] The first insulating member is sandwiched between the cover plate body and the riveted member, and a portion of the first insulating member is disposed around the circumferential side wall of the riveted member.

[0018] Preferably, it also includes:

[0019] The second insulating member is arranged on a side of the cover plate body facing the interior of the battery cell, and a portion of the second insulating member is sandwiched between the cover plate body and the plate body.

[0020] Preferably, it also includes:

[0021] The sealing member is sleeved on the column portion, and part of the sealing member is sandwiched between the cover plate body and the plate body portion.

[0022] 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.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] In the battery cell cover of the present invention, the cross-section of the pole perpendicular to its axis is formed into a strip structure, which increases the flow capacity compared to the traditional cylindrical pole structure. By limiting the size ratio between the column part and the plate part of the pole to K = (1 / 3~2 / 3)L and M = (1 / 3~2 / 3)W, the flow capacity of the pole is effectively increased while the structural strength of the cover body is not affected by the opening size of the mounting hole, thereby ensuring that the structural strength of the battery cell cover meets the use requirements of the battery cell, and the battery cell meets the fast charging requirements while also having reliable safety performance.

[0025] 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

[0026] 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.

[0027] Figure 1 A schematic structural diagram of a cell cover provided in an embodiment of the present utility model;

[0028] Figure 2 A schematic structural diagram of a cell cover provided by an embodiment of the present utility model from another perspective;

[0029] Figure 3 For the Figure 2 Cross-sectional view taken at EE in the middle;

[0030] Figure 4 For the Figure 2 Cross-sectional view taken at FF in the middle;

[0031] Figure 5 A schematic diagram of the structure of the battery cover before the pole is riveted provided by an embodiment of the present invention;

[0032] Figure 6 A schematic structural diagram of a battery cell cover plate provided by an embodiment of the present invention before the pole is riveted from another perspective;

[0033] Figure 7 A schematic structural diagram of a battery cell cover plate provided by an embodiment of the present invention before the pole is riveted from another perspective;

[0034] Figure 8 A schematic diagram of the structure of the battery cover after the poles are riveted provided by an embodiment of the utility model;

[0035] Figure 9 This is a structural schematic diagram of the battery cell cover provided by an embodiment of the present invention after the poles are riveted from another perspective.

[0036] Icons: 10-cover plate body; 11-mounting hole; 20-pole; 21-first column part; 211-expansion part; 22-second column part; 23-plate part; 30-rivet; 31-rivet hole; 311-first step section; 312-second step section; 313-third step section; 40-first insulating part; 50-second insulating part; 60-sealing part. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] 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.

[0040] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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 .

[0047] Hereinafter, the specific structure of the cell cover plate as described above according to this embodiment will be described.

[0048] 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 sheet 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. A mounting hole 11 is opened on the cover body 10. The mounting hole 11 is formed as a through-hole structure penetrating the cover body 10. The axial direction of the mounting hole 11 is the thickness direction of the cover body 10.

[0049] In this embodiment, if Figures 1 to 9 As shown, the pole 20 includes a column portion and a plate portion 23 arranged in sequence along its axial direction. The column portion is passed through the mounting hole 11, and part of the column portion extends out of the side of the cover body 10 facing the outside of the battery cell, and is used to connect with components such as the bus bar outside the battery cell; the plate portion 23 is formed into a plate-like structure, for example, it can be a polygonal plate structure, and the plate portion 23 is arranged on the side of the cover body 10 facing the inside of the battery cell, and is used to connect with the pole ear on the pole group arranged inside the battery cell to realize the transmission of electric energy.

[0050] In this embodiment, if Figures 1 to 4 As shown, the rivet 30 is formed as a block structure arranged on the side of the cover body 10 facing the outside of the battery cell. A rivet hole 31 is opened on the rivet 30. The rivet hole 31 is a through-hole structure that penetrates the rivet 30. The end of the column part away from the plate part 23 is passed through the rivet hole 31. The pole 20 is riveted with the rivet 30 so that part of the circumferential side wall of the column part expands outward to form a bulging portion 211. The bulging portion 211 can be formed by stamping the end of the pole 20 arranged outside the battery cell. In this way, the pole 20 and the cover body 10 are fixed by riveting the pole 20 and the rivet 30.

[0051] In this embodiment, the cross-section of the pole 20 perpendicular to its axis is formed into a strip structure, that is, any cross-section of the pole 20 perpendicular to its axis is formed into a strip structure with a length dimension and a width dimension, for example, it can be an elliptical, rectangular or runway-shaped strip structure with semicircular ends and a rectangular middle. Compared with the traditional pole 20 structure with a circular cross-section, the current capacity can be effectively improved, and when the battery cell is a blade battery cell with a smaller thickness dimension (that is, the width dimension of the cover body 10 is smaller), the strip structure can extend along the length direction of the cover body 10, thereby avoiding the opening size of the mounting hole 11 being too large to affect the structural strength of the cover body 10.

[0052] Furthermore, in this embodiment, Figure 7As shown, K = (1 / 3 ~ 2 / 3) L, that is, K is 1 / 3 to 2 / 3 times L; M = (1 / 3 ~ 2 / 3) W, that is, M is 1 / 3 to 2 / 3 times W; wherein, K is the maximum length dimension of the column before riveting, in mm; M is the maximum width dimension of the column before riveting, in mm; L is the length dimension of the plate portion 23, in mm; W is the width dimension of the plate portion 23, in mm, thereby ensuring that the pole 20 effectively increases the overcurrent capacity while making the structural strength of the cover plate body 10 not affected by the opening size of the mounting hole 11, thereby ensuring that the structural strength of the battery cover meets the use requirements of the battery cell.

[0053] It should be noted that the length of the column or plate portion 23 is Figure 7 The horizontal dimension of the column or plate portion 23 is the width dimension of the column or plate portion 23 under the viewing angle. Figure 7 It should be further explained that, in this embodiment, the maximum length dimension of the column before riveting is in the same direction as the length dimension of the rectangular cover plate body 10, and the maximum width dimension of the column before riveting is in the same direction as the width dimension of the rectangular cover plate body 10.

[0054] In this embodiment, if Figures 2 to 4 As shown, the mounting hole 11 is set in the middle position in the width direction of the cover body 10, so as to ensure that the mounting hole 11 is at equal distances from the edges on both sides of the width direction of the cover body 10, thereby ensuring the structural strength of the cover body 10.

[0055] It should be noted that the length direction of the cover body 10 is Figure 2 In the horizontal direction of the viewing angle, the width direction of the cover body 10 is Figure 2 In the vertical direction of the viewing angle, the thickness direction of the cover body 10 is Figure 3 Vertical direction of viewing angle.

[0056] In this embodiment, if Figure 6 As shown, the height dimension of the plate body 23 in the axial direction of the pole 20 is h, 1mm≤h≤3mm, preferably, h=1.5mm, so as to ensure that the cover body 10 and the plate body 23 can be effectively pressed against the seal 60 described below, so that the seal 60 has a reliable compression amount, ensuring the sealing of the battery cover, and avoiding the plate body 23 from excessively occupying the space inside the battery cell, thereby affecting the energy density.

[0057] Furthermore, in this embodiment, Figures 1 to 9As shown, the column portion includes a first column portion 21 and a second column portion 22 arranged in sequence along the axial direction of the pole 20, and the second column portion 22 is arranged between the plate portion 23 and the first column portion 21, that is, the first column portion 21, the second column portion 22 and the plate portion 23 are arranged in sequence along the axial direction of the pole 20, the first column portion 21 extends out of the mounting hole 11 and is arranged on the side of the cover body 10 facing the outside of the battery cell, and the rising portion 211 is formed by the outward expansion of part of the circumferential side wall of the first column portion 21. Specifically, the rising portion 211 is formed on the circumferential side wall of the first column portion 21 away from the second column portion 22.

[0058] In this embodiment, the shape of the cross section of the first column portion 21 perpendicular to the axial direction of the pole 20 is the same as the shape of the cross section of the second column portion 22 perpendicular to the axial direction of the pole 20 , but the areas are different.

[0059] Furthermore, in this embodiment, if Figure 7 As shown, 0.5mm≤KA≤2mm, K is the maximum length of the second column portion 22 before riveting, and A is the maximum length of the first column portion 21 before riveting. This ensures that after the rising portion 211 is formed, the pole 20 and the rivet 30 are reliably riveted, avoiding the rivet 30 from falling off the battery cover, thereby ensuring the safety of the battery cell.

[0060] Furthermore, in this embodiment, if Figure 7 As shown, 0.5mm≤MB≤2mm; M is the maximum width dimension of the second column portion 22 before riveting, and B is the maximum width dimension of the first column portion 21 before riveting. This ensures that after the rising portion 211 is formed, the pole 20 and the rivet 30 are reliably riveted, avoiding the rivet 30 from falling off the battery cover, thereby ensuring the safety of the battery cell.

[0061] In this embodiment, the axis of the first column portion 21 is colinear with the axis of the second column portion 22 , thereby ensuring that the post 20 is reliably riveted to the rivet 30 after the expanded portion 211 on the first column portion 21 is formed.

[0062] In this embodiment, if Figures 2 to 4As shown, the pole 20 and the rivet 30 are first riveted and then welded. Specifically, the rivet hole 31 is formed into a stepped hole structure including a first step section 311, a second step section 312 and a third step section 313. The first step section 311, the second step section 312 and the third step section 313 are arranged in sequence along the axial direction of the rivet hole 31. The size of the first step section 311 in the length direction of the cover plate body 10 is greater than the size of the second step section 312 in the length direction of the cover plate body 10. The dimension of the stepped section 313 along the length of the cover plate body 10, and the dimension of the first stepped section 311 along the width of the cover plate body 10, greater than the dimension of the second stepped section 312 along the width of the cover plate body 10, greater than the dimension of the third stepped section 313 along the width of the cover plate body 10. The end of the rising portion 211 facing the cover plate body 10 abuts against the boss between the second stepped section 312 and the third stepped section 313, thereby achieving a riveted connection between the terminal 20 and the rivet 30. After riveting, the end of the rising portion 211 facing the outside of the battery cell is welded to the second stepped section 312 to form a weld mark. The first stepped section 311 can accommodate part of the weld mark to prevent the weld mark from protruding and affecting the flatness of the rivet 30 on the side facing away from the cover plate body 10.

[0063] In this embodiment, if Figures 1 to 4 As shown, the cell cover further includes a first insulating member 40 formed of an insulating material. The first insulating member 40 is sandwiched between the cover body 10 and the rivet 30 to separate the cover body 10 and the rivet 30, thereby providing insulation protection for the cover body 10. Preferably, a portion of the first insulating member 40 is disposed around the circumferential sidewall of the rivet 30, thereby enhancing the insulation protection effect of the cover body 10.

[0064] In this embodiment, if Figures 1 to 4 As shown, the cell cover also includes a second insulating member 50. The second insulating member 50 and the first insulating member 40 described above can be formed of insulating materials such as PP (polypropylene), PPS (polyphenylene sulfide) or LCP (liquid crystal polymer). The second insulating member 50 is arranged on the side of the cover body 10 facing the interior of the cell to prevent the electrode group and the pole 20 arranged inside the cell from contacting the cover body 10, so as to further provide insulation protection for the cover body 10. Preferably, part of the second insulating member 50 is sandwiched between the cover body 10 and the plate portion 23, so as to avoid overlapping of the cover body 10 and the plate portion 23 of the pole 20 to cause a short circuit, thereby improving the insulation protection effect of the second insulating member 50 on the cover body 10.

[0065] In addition, in this embodiment, Figure 3 and Figure 4As shown, the cell cover also includes a seal 60, which can be an elastic fluororubber sealing ring. The seal 60 is sleeved on the column portion, specifically on the circumferential side wall of the second column portion 22. Part of the seal 60 is clamped between the cover body 10 and the plate portion 23. In this way, after the pole 20 is riveted to the rivet 30, the seal 60 is compressed to a certain extent, thereby ensuring the sealing performance of the cell cover.

[0066] According to a battery cell cover provided by the utility model, the cross-section of the pole perpendicular to its axis is formed into a strip structure, which increases the flow capacity compared to the traditional cylindrical pole structure. By limiting the size ratio between the column part and the plate part of the pole to K = (1 / 3~2 / 3)L and M = (1 / 3~2 / 3)W, the flow capacity of the pole is effectively increased, while the structural strength of the cover body is not affected by the opening size of the mounting hole, thereby ensuring that the structural strength of the battery cell cover meets the use requirements of the battery cell.

[0067] According to a battery cell provided by the utility model, including the battery cell cover as described above, the battery cell meets the fast charging requirements while also having reliable safety performance.

[0068] 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 plate includes: The cover plate body is provided with a mounting hole; The pole comprises a column portion and a plate portion sequentially arranged along the axial direction of the pole, the column portion is passed through the mounting hole, and the plate portion is arranged on a side of the cover body facing the interior of the battery cell; A rivet having a rivet hole, wherein one end of the column away from the plate portion is passed through the rivet hole, and the pole is riveted to the rivet so that a portion of the circumferential side wall of the column portion expands outward to form a bulging portion; The cross section of the pole perpendicular to its axis is formed into a strip structure, K = (1 / 3 to 2 / 3) L, M = (1 / 3 to 2 / 3) W; Among them, K is the maximum length dimension of the column part before riveting, in mm; M is the maximum width dimension of the column part before riveting, in mm; L is the length dimension of the plate part, in mm; W is the width dimension of the plate part, in mm.

2. The cell cover according to claim 1, characterized in that: The height dimension of the plate body in the axial direction of the pole is h, 1mm≤h≤3mm.

3. The cell cover according to claim 1, wherein: The column portion includes a first column portion and a second column portion arranged along the axial direction of the pole, the second column portion is arranged between the plate portion and the first column portion, and the expanding portion is formed by expanding part of the circumferential side wall of the first column portion outward.

4. The cell cover according to claim 3, characterized in that: 0.5mm≤KA≤2mm, K is the maximum length of the second column before riveting, and A is the maximum length of the first column before riveting.

5. The battery cell cover according to claim 3, characterized in that: 0.5mm≤MB≤2mm; M is the maximum width of the second column before riveting, and B is the maximum width of the first column before riveting.

6. The cell cover according to claim 1, characterized in that: The rivet hole is formed as a stepped hole structure including a first step section, a second step section and a third step section. The first step section, the second step section and the third step section are arranged sequentially along the axial direction of the rivet hole, and the end of the rising portion facing the cover plate body abuts against the boss between the second step section and the third step section.

7. The battery cell cover according to claim 1, characterized in that: Also includes: The first insulating member is sandwiched between the cover plate body and the riveted member, and a portion of the first insulating member is disposed around the circumferential side wall of the riveted member.

8. The cell cover according to claim 1, characterized in that: Also includes: The second insulating member is arranged on a side of the cover plate body facing the interior of the battery cell, and a portion of the second insulating member is sandwiched between the cover plate body and the plate body.

9. The battery cell cover according to claim 1, characterized in that: Also includes: The sealing member is sleeved on the column portion, and part of the sealing member is sandwiched between the cover plate body and the plate body portion.

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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