Cover plate and battery cell

Abstract

The utility model provides a cover plate and a battery cell, and relates to the technical field of batteries. The cover plate comprises a connecting piece and a pole, the connecting piece comprises a mounting piece and two connecting pieces, the mounting piece is provided with a mounting cavity, part of the pole extends into the mounting cavity and is connected with the hole wall of the mounting cavity, the two connecting pieces are both connected with the mounting piece, and the connecting pieces are used for being connected with tabs. When the battery cell with the cover plate disclosed by the utility model is assembled, the pole group and the pole can be connected only by connecting the pole with the mounting piece and connecting the connecting piece with the tab, so that the assembling process of the battery cell is simplified.

Description

Cover plate and battery cell Technical Field

[0001] This application relates to the field of battery technology, and in particular to a cover plate and a battery cell. Background Technology

[0002] A battery cell generally consists of a casing, a cover plate, and electrode assemblies. The casing has an opening, and the cover plate covers the opening. The electrode assemblies are housed inside the casing. The cover plate includes a plain aluminum plate, electrode posts, connecting tabs, and rivet blocks. An opening is formed in the plain aluminum plate, and the electrode posts are placed within the opening. The rivet blocks are located on one side of the plain aluminum plate, connecting the electrode posts to the rivet blocks for fixation. The electrode tabs of the electrode assemblies are connected to the electrode posts in the cover plate via connecting tabs, thus connecting the electrode assemblies to the electrode posts. Therefore, during battery cell assembly, the electrode posts and rivet blocks need to be riveted together, and the electrode posts need to be welded to the connecting tabs, as well as the connecting tabs to the electrode tabs, to achieve the connection between the electrode assemblies and the electrode posts. The battery cell assembly process is relatively complex. Summary of the Invention

[0003] In view of this, this application provides a cover plate and a battery cell to solve the problem that the assembly process of existing battery cells is relatively complicated.

[0004] According to one aspect of this application, a cover plate is provided, the cover plate including a connecting piece and an electrode post, the connecting piece including a mounting member and two connecting members, the mounting member having a mounting cavity, a portion of the electrode post extending into the mounting cavity and connected to the bore wall of the mounting cavity, both connecting members being connected to the mounting member, the connecting members being used to connect to an electrode tab.

[0005] Preferably, the pole post includes a first conductive element, the first conductive element includes a main body and a riveting part, the riveting part protruding from the outer side wall of the main body;

[0006] The mounting cavity includes a first mounting hole and a second mounting hole, both of which extend along a first direction. The first mounting hole communicates with the second mounting hole. The main body fits against the wall of the first mounting hole, and the riveting part is connected to the wall of the second mounting hole.

[0007] Preferably, the width of the riveted portion is greater than or equal to 0.25 mm and less than or equal to 1 mm.

[0008] Preferably, the cover plate further includes a plate body, on which an installation opening is provided, and the portion of the pole post is located within the installation opening;

[0009] The connector includes a connecting surface facing the plate body, and the connecting surface is used to connect with the electrode tab.

[0010] Preferably, the pole further includes a second conductive element and a third conductive element, the two ends of the second conductive element in the first direction are respectively connected to the first conductive element and the third conductive element, and the first conductive element and the third conductive element are respectively located on both sides of the plate body in the first direction.

[0011] Preferably, the electrode post has a weight-reducing groove, which extends from the end face of the first conductive element opposite to the second conductive element in the first direction toward the interior of the electrode post.

[0012] Preferably, the two connectors are respectively connected to the two sides of the mounting member in the second direction. The connectors are provided with a plurality of through slots that pass through the connectors. The plurality of through slots are arranged at intervals along a third direction, and the third direction is perpendicular to the plane determined by the first direction and the second direction.

[0013] Preferably, the cover plate further includes a sealing element, the sealing element including a first sealing portion, the first sealing portion including a first sealing surface and a second sealing surface opposite to each other in the first direction, the first sealing surface being in contact with the mounting member, a portion of the second sealing surface being in contact with the second conductive member, and another portion of the second sealing surface being in contact with the plate body.

[0014] Preferably, the seal further includes a second sealing portion, which is connected to the second sealing surface and is located between the inner wall of the mounting port and the second conductive element.

[0015] According to another aspect of this application, a battery cell is provided, the battery cell including the aforementioned cover plate.

[0016] The cover plate of this application includes a connecting piece and a terminal post. The connecting piece includes a mounting member and two connecting members. The mounting member has a mounting cavity, and a portion of the terminal post extends into the mounting cavity and connects to the wall of the mounting cavity. Both connecting members are connected to the mounting member and are used to connect to the electrode tab. When assembling a battery cell with the cover plate of this application, it is only necessary to connect the terminal post to the mounting member and the connecting members to the electrode tab to complete the connection between the electrode group and the terminal post, thereby simplifying the battery cell assembly process. Attached Figure Description

[0017] 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.

[0018] Figure 1 shows a schematic diagram of the planar structure of the cover plate;

[0019] Figure 2 shows a cross-sectional view of the cover plate in Figure 1 obtained by cutting along A-A';

[0020] Figure 3 shows a cross-sectional view of the connecting piece when the connector is in the second state;

[0021] Figure 4 shows a three-dimensional structural diagram of the connecting piece when the connector is in the first state;

[0022] Figure 5 shows a three-dimensional structural diagram of the connecting piece when the connector is in the second state;

[0023] Figure 6 shows a schematic diagram of the battery cell structure;

[0024] Figure 7 shows the relative positions of the electrode lug and the connector when the connector is not bent;

[0025] Figure 8 shows a cross-sectional view of the battery cell;

[0026] Figure 9 shows an enlarged view of part B in Figure 8.

[0027] Icons: 1-Plate body; 2-Electrical post; 21-First conductive element; 211-Main body; 212-Riveting part; 22-Second conductive element; 23-Third conductive element; 24-Weight reduction groove; 3-Connecting piece; 31-Mounting part; 32-Connecting part; 321-Fusible part; 33-Through groove; 34-Mounting cavity; 341-First mounting hole; 342-Second mounting hole; 35-Connecting hole; 4-Sealing element; 41-First sealing part; 42-Second sealing part; 5-Plastic part; 51-Supporting plate; 52-Enclosure plate; 6-Electrical assembly; 61-Electrical assembly body; 62-Electrical tab; 7-Housing; S1-Connecting surface; L1-First direction; L2-Second direction; L3-Third direction. Detailed Implementation

[0028] 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.

[0029] 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.

[0030] 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.

[0031] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] The cover plate and battery cell of this application will be described below with reference to Figures 1 to 9. In Figures 1 to 9, the first direction L1, the second direction L2 and the third direction L3 are perpendicular to each other.

[0038] According to one aspect of this application, a cover plate is provided, as shown in Figures 1 to 6. The cover plate includes a connecting piece 3 and a terminal post 2. The connecting piece 3 includes a mounting member 31 and two connecting members 32. The mounting member 31 has a mounting cavity 34. A portion of the terminal post 2 extends into the mounting cavity 34 and connects to the wall of the mounting cavity 34. Both connecting members 32 are connected to the mounting member 31 and are used to connect to the electrode tab 62. Thus, when assembling a battery cell with the cover plate of this application, it is only necessary to connect the terminal post 2 to the mounting member 31 and connect the connecting members 32 to the electrode tab 62 to complete the connection between the electrode group 6 and the terminal post 2, thereby simplifying the battery cell assembly process.

[0039] Furthermore, the cover plate of this application achieves the connection between the pole group 6 and the pole post 2 and the fixation of the pole post 2 through the connecting piece 3, thereby reducing the number of parts in the cover plate.

[0040] Preferably, the entire connecting piece 3 is integrally formed.

[0041] Furthermore, the connector 32 includes a connecting surface S1 for connecting with the tab 62. The connector 32 is bendable, allowing it to switch from a first state to a second state. When the connector 32 is in the first state, as shown in Figure 5, the connecting surface S1 is perpendicular to the second direction L2. When the connector 32 is in the second state, as shown in Figure 6, the connecting surface S1 faces the board body 1. Thus, as shown in Figure 9, the tab 62 only occupies the space between the board body 1 and the connecting surface S1, resulting in a smaller space occupied by the tab 62 and improving the space utilization rate of the battery cell.

[0042] In the embodiments of this application, as shown in Figures 3 to 6, the connector 32 has multiple through grooves 33 that penetrate through the connector 32. By creating the through grooves 33, multiple disconnected portions are formed on the connector 32, which are called fusion breaks 321. The number of fusion breaks 321 is greater than or equal to 2. The location of the fusion break 321 is the weak point of the connector 32. After the connector 32 is in the first state and the electrode 62 is welded to the connecting surface S1, the connector 32 can be forced by a tool to bend at the location of the fusion break 321, thereby switching the connector 32 to the second state. When the connector 32 is in the second state, the through grooves 33 extend along the first direction L1, the multiple through grooves 33 overlap in the second direction L2, and the multiple through grooves 33 are spaced apart along the third direction L3. In this way, the connector 32 is in the first state when welding with the electrode 62, which improves the convenience of welding the electrode 62. After the connector 32 is welded to the tab 62, it can be bent, which places part of the tab 62 between the connector 32 and the plate body 1. This reduces the space occupied by the tab 62, thereby improving the space utilization of the cell.

[0043] It should be noted that the relative positions of the tab 62 and the connector 32 are only schematically shown in Figures 7, 8 and 9. During the process of bending the mounting part 31 by 90 degrees with the help of the tooling, the position of the tab 62 will shift.

[0044] Furthermore, when the current increases sharply, the fuse 321 can melt to cut off the circuit, thereby improving the safety of the battery cell.

[0045] In an embodiment of this application, as shown in FIG2, the electrode post 2 includes a first conductive element 21, which includes a main body portion 211 and a riveting portion 212. The riveting portion 212 protrudes from the outer side wall of the main body portion 211. The mounting cavity 34 includes a first mounting hole 341 and a second mounting hole 342, both of which extend along a first direction L1. The first mounting hole 341 communicates with the second mounting hole 342. The main body portion 211 fits against the wall of the first mounting hole 341, and the riveting portion 212 fits against the wall of the second mounting hole 342. They are connected by laser welding. Thus, by cooperating with the first conductive element 21 and the mounting cavity 34, the connection between the electrode post 2 and the connecting piece 3 can be achieved.

[0046] Furthermore, the width W of the riveting portion 212 is greater than or equal to 0.25 mm and less than or equal to 1 mm, i.e., 0.25 mm ≤ W ≤ 1 mm, to ensure the connection strength between the pole post 2 and the mounting part 31. The width W of the riveting portion 212 can be 0.25 mm, 0.26 mm, 0.27 mm or 0.28 mm.

[0047] In addition, the mounting component 31 is also provided with a connecting hole 35, and the first mounting hole 341, the second mounting hole 342 and the connecting hole 35 all pass through the mounting component 31.

[0048] As shown in Figure 2, the pole post 2 also includes a second conductive element 22 and a third conductive element 23. The two ends of the second conductive element 22 in the second direction L2 are respectively connected to the first conductive element 21 and the third conductive element 23. The cover plate also includes a plate body 1. The plate body 1 has an installation port that penetrates through the plate body 1. Part of the second conductive element 22 is located in the installation port. The first conductive element 21 and the third conductive element 23 are located on both sides of the plate body 1 in the first direction L1.

[0049] Furthermore, the electrode post 2 is provided with a weight-reducing groove 24, which extends from the end face of the first conductive member 21 opposite to the second conductive member 22 in the first direction L1 toward the interior of the electrode post 2. Thus, a portion of the electrode post 2 is hollow, reducing the mass of the cover plate. Optionally, the weight-reducing groove 24 extends to the middle of the second conductive member 22.

[0050] As shown in Figure 2, the cover plate also includes a sealing element 4, which includes a first sealing portion 41. The first sealing portion 41 includes a first sealing surface and a second sealing surface that are opposite to each other in the first direction L1. The first sealing surface is in contact with the mounting member 31, a portion of the second sealing surface is in contact with the second conductive member 22, and the other portion of the second sealing surface is in contact with the plate body 1. In this way, the first sealing portion 41 achieves a seal between the connector 32 and the plate body 1, as well as between the connector 32 and the plate body 1.

[0051] Furthermore, the seal 4 also includes a second sealing part 42, which is connected to the second sealing surface. The second sealing part 42 is located between the inner wall of the mounting port and the second conductive element 22, thereby achieving a seal between the pole post 2 and the plate body 1. The first sealing part 41 and the second sealing part 42 cooperate to achieve a seal between the plate body 1, the pole post 2, and the connector 32.

[0052] In addition, the cover plate also includes a plastic component 5, which includes a support plate 51 and a surrounding plate 52. The support plate 51 is attached to the plate body 1, and the surrounding plate 52 surrounds the support plate 51. The support plate 51 has a connection port that communicates with the mounting port. A portion of the second conductive component 22 is located within the connection port, and the side of the third conductive component 23 facing the second conductive component 22 abuts against the support plate 51. The outer side wall of the third conductive component 23 is attached to the surrounding plate 52. Thus, by providing the plastic component 5, insulation between the pole post 2 and the housing 7 can be achieved.

[0053] Preferably, there are two pole posts 2, and each pole post 2 is provided with a connecting piece 3, a sealing element 4 and a plastic part 5.

[0054] According to another aspect of this application, a battery cell is provided, the battery cell including the aforementioned cover plate.

[0055] As shown in Figures 6 to 9, the battery cell also includes an electrode group 6 and a housing 7. The electrode group 6 includes an electrode group body 61 and two tabs 62. The two tabs 62 extend from the electrode group body 61 respectively. One tab 62 is a positive tab and the other tab 62 is a negative tab. There are two electrode groups 6. The two positive tabs in the two electrode groups 6 are connected to the two connectors 32 of the same connecting piece 3, and the two negative tabs in the two electrode groups 6 are connected to the two connectors 32 of another connecting piece 3.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A cover plate, characterized in that, The cover plate includes a connecting piece and an electrode post. The connecting piece includes a mounting member and two connecting members. The mounting member has a mounting cavity. A portion of the electrode post extends into the mounting cavity and is connected to the wall of the mounting cavity. Both connecting members are connected to the mounting member. The connecting members are used to connect to the electrode tab.

2. The cover plate according to claim 1, characterized in that, The pole includes a first conductive element, which includes a main body and a riveting part. The riveting part protrudes from the outer side wall of the main body. The mounting cavity includes a first mounting hole and a second mounting hole. Both the first mounting hole and the second mounting hole extend along a first direction. The first mounting hole communicates with the second mounting hole. The main body fits against the hole wall of the first mounting hole, and the riveting part is connected to the hole wall of the second mounting hole.

3. The cover plate according to claim 2, characterized in that, The width of the riveted part is greater than or equal to 0.25 mm and less than or equal to 1 mm.

4. The cover plate according to claim 2, characterized in that, The cover plate also includes a plate body, on which an installation opening is provided, and the portion of the pole is located within the installation opening; the connector includes a connecting surface, which faces the plate body, and the connecting surface is used to connect with the electrode tab.

5. The cover plate according to claim 4, characterized in that, The pole also includes a second conductive element and a third conductive element. The two ends of the second conductive element in the first direction are respectively connected to the first conductive element and the third conductive element. The first conductive element and the third conductive element are respectively located on both sides of the plate body in the first direction.

6. The cover plate according to claim 5, characterized in that, The electrode post has a weight-reducing groove, which extends from the end face of the first conductive element opposite to the second conductive element in the first direction toward the interior of the electrode post.

7. The cover plate according to claim 5, characterized in that, Two connectors are respectively connected to the two sides of the mounting member in the second direction. The connectors are provided with multiple through slots that pass through the connectors. The multiple through slots are arranged at intervals along a third direction, and the third direction is perpendicular to the plane determined by the first direction and the second direction.

8. The cover plate according to claim 5, characterized in that, The cover plate also includes a sealing element, which includes a first sealing portion. The first sealing portion includes a first sealing surface and a second sealing surface that are opposite to each other in the first direction. The first sealing surface is in contact with the mounting component, a portion of the second sealing surface is in contact with the second conductive component, and another portion of the second sealing surface is in contact with the plate body.

9. The cover plate according to claim 8, characterized in that, The sealing element further includes a second sealing portion, which is connected to the second sealing surface and is located between the inner wall of the mounting port and the second conductive element.

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

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