Pole, cover plate assembly and battery cell assembling mold core

Abstract

The utility model provides a pole column, a cover plate assembly and a battery cell assembling mold core, and relates to the technical field of batteries. The pole comprises a pole body, a base and two positioning tables, the base comprises a first plane and a second plane which are opposite to each other in a first direction, the pole body is fixed on the first plane, and the two positioning tables are respectively fixed on two sides of the base in a second direction. One side, back to the pole, of the positioning table in the first direction is higher than the second plane, and the first direction is crossed with the second direction. In the assembling process of the cover plate assembly, the pole columns can be fixed through the two positioning tables protruding relative to the first plane and the two positioning grooves in the battery cell assembling mold core, at the moment, the base is not used for positioning any more, the height difference of 1 mm does not need to be guaranteed for the mounting plane of the base and the lower plastic part, the internal space of a shell of a battery cell is increased, and the assembling efficiency is improved. And the capacity of the battery cell is improved.

Description

Technical Field

[0001] The present application relates to the field of battery terminals, and in particular to a terminal, a cover plate assembly and a core assembly die core for a battery cell. Background Art

[0002] Lithium-ion batteries are currently widely used in various fields such as transportation power sources, power energy storage power sources, new energy storage power sources, aerospace and military industries due to their advantages such as large capacity, high working voltage, strong charge retention ability, and long cycle life.

[0003] The structure of a single lithium-ion battery generally includes a pole group, electrolyte, cover plate, housing, and internal and external insulating materials. Among them, the cover plate and the housing are usually fixed by laser welding to form a sealed space with a certain structural strength to protect the pole group. The cover plate generally integrates functional areas such as terminals, explosion-proof valves, and liquid injection holes. The pole group is electrically connected by laser welding the pole ear to the pole base of the cover plate, thereby leading the current inside the battery cell out of the housing.

[0004] Existing cover plates are generally of a riveting structure. The cover plate includes a terminal, lower plastic, sealing ring, light aluminum sheet, upper plastic, riveting block, etc. During the assembly process, the terminal is first fixed by a mold, and then the lower plastic, sealing ring, light aluminum sheet, upper plastic, and riveting block are sequentially passed through the column part of the terminal. Then, using the fluidity of the material of the terminal body itself, at the center position of the top of the terminal column, under the punching action of a punch, the material is extruded to the hanging platform position of the riveting block, thereby fixing the various parts of the terminal.

[0005] However, during the assembly process of the cover plate, first, the base of the terminal needs to be fixed in the terminal assembly die core, and this requires a height difference of more than 1 mm between the base of the terminal and the lower plastic plane, that is, the base of the terminal is higher than the lower plastic plane by more than 1 mm, so as to ensure that the base of the terminal can be positioned along the width direction through the terminal assembly die core, thereby ensuring the symmetry of the overall assembly of the cover plate. However, the base of the terminal is relatively higher than the lower plastic plane by more than 1 mm, which reduces the internal space of the housing of the battery cell and decreases the capacity of the battery cell. Summary of the Utility Model

[0006] In view of this, the present application provides a terminal, a cover plate assembly and a core assembly die core for a battery cell to solve the problem that the base of the terminal is relatively higher than the lower plastic plane by more than 1 mm, which reduces the internal space of the housing of the battery cell and decreases the capacity of the battery cell.

[0007] According to a first aspect of the present application, a terminal post is provided. The terminal post includes a terminal post body, a base, and two positioning platforms. The base includes a first plane and a second plane that face away from each other in a first direction. The terminal post body is fixed on the first plane. The two positioning platforms are respectively fixed on both sides of the base in a second direction. The side of the positioning platform facing away from the terminal post in the first direction is higher than the second plane. The first direction intersects with the second direction.

[0008] Preferably, the positioning platform includes a third plane and a fourth plane that face away from each other in the first direction. The first plane is flush with the third plane. The distance between the first plane and the second plane is less than the distance between the third plane and the fourth plane.

[0009] Preferably, the distance between the second plane and the fourth plane is 0.5 mm - 1.0 mm.

[0010] Preferably, the dimension of the positioning platform in a third direction is smaller than the dimension of the base in the third direction. The third direction intersects with the plane determined by the first direction and the second direction.

[0011] According to a second aspect of the present application, a cover plate assembly is provided. The cover plate assembly includes the above-mentioned terminal post, and the terminal post is connected to the lower plastic part.

[0012] Preferably, the cover plate assembly further includes a lower plastic part. The lower plastic part includes a first placement groove and a through hole. The through hole penetrates through the lower plastic part and is communicated with the first placement groove. The base is located in the first placement groove, and the terminal post body passes through the through hole.

[0013] Preferably, the lower plastic part further includes two second placement grooves. The two second placement grooves are respectively located on both sides of the first placement groove in the second direction. The two positioning platforms respectively correspond to the two second placement grooves. A part of the positioning platform is located in the corresponding second placement groove, and the other part protrudes from the corresponding second placement groove.

[0014] According to a third aspect of the present application, a core assembly die core is provided. The core assembly die core is used to fix the above-mentioned terminal post. The core assembly die core includes a positioning plane and two positioning grooves. The positioning grooves are recessed from the positioning plane along the first direction towards the inside of the core assembly die core. The two positioning grooves are arranged at intervals along the second direction. The two positioning platforms respectively correspond to the two positioning grooves, and a part of the positioning platform is located in the corresponding positioning groove.

[0015] Preferably, the dimension of the positioning groove in the first direction is 0.3 mm - 0.5 mm.

[0016] Preferably, the first plane is higher than the positioning plane, and the distance between the first plane and the positioning plane is 1.5 mm - 2.0 mm.

[0017] In the terminal post of the present application, the terminal post includes a terminal post body, a base, and two positioning platforms. The base includes a first plane and a second plane that face away from each other in a first direction. The terminal post body is fixed on the first plane, and the two positioning platforms are respectively fixed on both sides of the base in a second direction. The side of the positioning platform facing away from the terminal post in the first direction is higher than the second plane. During the assembly process of the cover plate assembly, the terminal post can be fixed by the two positioning platforms protruding relative to the first plane and the two positioning slots in the battery cell assembly die core. At this time, the base is no longer used for positioning, and there is no need to ensure a height difference of 1 mm between the installation plane of the base and the lower plastic part. The internal space of the housing of the battery cell increases, improving the capacity of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 Showing a three-dimensional structural schematic diagram of the terminal post;

[0020] Figure 2 Showing a partial structural schematic diagram of the terminal post;

[0021] Figure 3 Showing a relative position diagram of the terminal post and the lower plastic part;

[0022] Figure 4 Showing a structural schematic diagram of the lower plastic part;

[0023] Figure 5 Showing an exploded view of the cover plate assembly;

[0024] Figure 6 Showing a structural schematic diagram of the battery cell assembly die core;

[0025] Figure 7 Showing a partial sectional view when the terminal post is placed in the battery cell assembly die core.

[0026] Icon: 1 - terminal post; 11 - terminal post body; 12 - base; 121 - first plane; 122 - second plane; 13 - positioning platform; 131 - third plane; 132 - fourth plane; 133 - side surface; 2 - lower plastic part; 21 - through hole; 22 - first placement groove; 23 - second placement groove; 3 - polished aluminum sheet; 31 - first connection hole; 4 - upper plastic part; 41 - second connection hole; 5 - sealing ring; 6 - connecting piece; 61 - third connection hole; 7 - battery cell assembly die core; 71 - positioning plane; 72 - positioning groove; 73 - connection groove; L1 - first direction; L2 - second direction; L3 - third direction. Detailed implementation manners

[0027] The following detailed implementation manners are provided to assist the reader in obtaining a comprehensive understanding of the methods, devices, and / or systems described herein. However, after understanding the disclosure of this application, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein. Rather, changes that will be apparent after understanding the disclosure of this application can be made, except for operations that must occur in a specific order. In addition, descriptions of features known in the art may be omitted for the sake of clarity and conciseness.

[0028] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, devices, and / or systems described herein that will be apparent after understanding the disclosure of this application.

[0029] Throughout the specification, when an element (such as a layer, region, or substrate) is described as "on" another element, "connected to" another element, "bonded to" another element, "above" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "above" another element, or "covering" another element, or there may be one or more other elements therebetween. In contrast, when an element is described as "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly above" another element, or "directly covering" another element, there may be no other elements therebetween.

[0030] As used herein, the term "and / or" includes any one of the listed related items and any combination of any two or more of them.

[0031] Although terms such as "first", "second", and "third" may be used herein to describe various components, elements, regions, layers, or sections, these components, elements, regions, layers, or sections are not limited by these terms. Rather, these terms are only used to distinguish one component, element, region, layer, or section from another. Thus, a first component, element, region, layer, or section as referred to in the examples described herein may also be referred to as a second component, element, region, layer, or section without departing from the teachings of the examples.

[0032] For ease of description, spatial relationship terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another as shown in the figures. Such spatial relationship terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, an element described as "above" or "upper" relative to another element will then be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientation of "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 relationship terms used herein will be interpreted accordingly.

[0033] The terms used herein are for the purpose of describing various examples only and are not intended to limit the disclosure. Unless the context clearly dictates otherwise, the singular forms are also intended to include the plural forms. The terms "comprises", "comprising", and "having" list the stated features, quantities, operations, components, elements, and / or combinations thereof that exist, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0034] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the figures may occur. Thus, the examples described herein are not limited to the specific shapes shown in the figures but include changes in shape that occur during manufacturing.

[0035] The features of the examples described herein may 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 a variety of configurations, other configurations will be apparent after understanding the disclosure of the present application.

[0036] The following will be combined with Figures 1 to 7 to describe the terminal post 1, cover plate assembly, and cell assembly die core 7 of the present application. In Figures 1 to 7In it, the first direction L1 intersects with the second direction L2, and the third direction L3 intersects with the plane determined by the first direction L1 and the second direction L2. Preferably, the first direction L1, the second direction L2, and the third direction L3 are perpendicular to each other in pairs.

[0037] According to the first aspect of the present application, a terminal post 1 is provided, as Figure 1 and Figure 2 shown. The terminal post 1 includes a terminal post body 11, a base 12, and two positioning platforms 13. The base 12 includes a first plane 121 and a second plane 122 that face away from each other in the first direction L1. The first plane 121 is parallel to the second plane 122. The terminal post body 11 is fixed on the first plane 121. The two positioning platforms 13 are respectively fixed on both sides of the base 12 in the second direction L2. The side of the positioning platform 13 facing away from the terminal post 1 in the first direction L1 is higher than the second plane 122. During the assembly process of the cover plate assembly, as Figure 7 shown, the two positioning platforms 13 protruding relative to the first plane 121 can be used to fix the terminal post 1 with the two positioning grooves 72 in the battery cell assembly die core 7. At this time, the base 12 is no longer used for positioning, and there is no need to ensure a height difference of 1 mm between the installation plane of the base 12 and the lower plastic part 2. The internal space of the battery cell housing increases, and the capacity of the battery cell is improved.

[0038] In an embodiment of the present application, as Figure 1 and Figure 2 shown, the positioning platform 13 includes a side surface 133, and a third plane 131 and a fourth plane 132 that face away from each other in the first direction L1. The side surface 133 can be a part of the side surface of a cylinder. The third plane 131 is parallel to the fourth plane 132. The first plane 121 is flush with the third plane 131. The distance between the first plane 121 and the second plane 122 is less than the distance between the third plane 131 and the fourth plane 132. That is, one side of the positioning platform 13 in the first direction L1 is flush with the base 12, and the other side in the first direction L1 protrudes relative to the base 12. The positioning of the terminal post 1 can be achieved through the protruding part of the positioning platform 13 relative to the base 12.

[0039] Preferably, the distance a between the second plane 122 and the fourth plane 132 is 0.5 mm - 1.0 mm. That is, the size of the protruding part of the positioning platform 13 relative to the base 12 in the first direction L1 is 0.5 mm - 1.0 mm. For example, the size of the protruding part of the positioning platform 13 relative to the base 12 in the first direction L1 can be 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.8 mm, 0.9 mm, or 1.0 mm, etc. By setting the protruding part of the positioning platform 13 relative to the base 12 to the above size, the positioning requirements for the terminal post 1 can be met.

[0040] Further, the dimension of the positioning platform 13 in the third direction L3 is smaller than that of the base 12 in the third direction L3. In this way, the relatively protruding positioning platform 13 with a smaller volume can achieve the positioning of the pole column 1, and the space occupied by the pole column 1 inside the housing of the battery cell can be reduced.

[0041] According to a second aspect of the present application, a cover plate assembly is provided, and the cover plate assembly includes the above-mentioned pole column 1.

[0042] Further, as Figure 3 、 Figure 4 and Figure 5 shown, the cover plate assembly further includes a lower plastic part 2, a light aluminum sheet 3, an upper plastic part 4, a sealing ring 5 and a connecting part 6. The lower plastic part 2 and the upper plastic part 4 are respectively located on both sides of the light aluminum sheet 3 in the first direction L1. The sealing ring 5 is sleeved on the pole column body 11. The lower plastic part 2 includes a first placement groove 22 and a through hole 21. The through hole 21 penetrates through the lower plastic part 2, and the through hole 21 communicates with the first placement groove 22. The base 12 is located in the first placement groove 22. The pole column body 11 passes through the through hole 21, the first connection hole 31 on the light aluminum sheet 3, the second connection hole 41 on the upper plastic part 4 and the third connection hole 61 on the connecting part 6.

[0043] As Figure 4 shown, the lower plastic part 2 further includes two second placement grooves 23. The two second placement grooves 23 are respectively located on both sides of the first placement groove 22 in the second direction L2. The two positioning platforms 13 respectively correspond to the two second placement grooves 23. A part of the positioning platform 13 is located in the corresponding second placement groove 23, and the other part protrudes from the corresponding second placement groove 23. By providing two second placement grooves 23 corresponding to the positioning platforms 13, it is convenient to install the pole column 1 on the lower plastic part 2. The part of the positioning platform 13 located outside the second placement groove 23 is the part for cooperating with the positioning groove 72 in the battery cell assembly die core 7. When installing the lower plastic part 2 on the pole column 1 fixed on the battery cell assembly die core 7, a part of the positioning platform 13 is located in the second placement groove 23, and the other part is located in the positioning groove 72 in the battery cell assembly die core 7. After the entire cover plate assembly is assembled, the battery cell assembly die core 7 is removed, and at this time, a part of the positioning platform 13 protrudes from the second placement groove 23.

[0044] According to a third aspect of the present application, a battery cell assembly die core 7 is provided. When assembling the cover plate assembly, the battery cell assembly die core 7 is used to fix the pole column 1. As Figure 6 and Figure 7As shown, the battery cell assembly die core 7 is in a plate shape. The battery cell assembly die core 7 includes a positioning plane 71 and two positioning grooves 72. The positioning grooves 72 are recessed from the positioning plane 71 towards the inside of the battery cell assembly die core 7 along the first direction L1. The two positioning grooves 72 are arranged at intervals along the second direction L2. The two positioning platforms 13 respectively correspond to the two positioning grooves 72, and part of the positioning platform 13 is located within the positioning groove 72. Through the two positioning grooves 72 arranged at intervals, positioning of the pole column 1 in the first direction L1 can be achieved.

[0045] Furthermore, the battery cell assembly die core 7 further includes a connecting groove 73. The connecting groove 73 is recessed from the positioning plane 71 towards the inside of the battery cell assembly die core 7 along the first direction L1. The two positioning grooves 72 are located on both sides of the connecting groove 73 in the second direction L2, and the positioning grooves 72 communicate with the connecting groove 73. The position of the connecting groove 73 corresponds to the position of the base 12.

[0046] Optionally, the dimension b of the positioning groove 72 in the first direction L1 is 0.3 mm - 0.5 mm, that is, the depth of the positioning groove 72 is 0.3 mm - 0.5 mm. For example, the dimension of the positioning groove 72 in the first direction L1 can be 0.3 mm, 0.35 mm, 0.4 mm, 0.42 mm, 0.48 mm or 0.5 mm, etc.

[0047] When installing the pole column 1 on the battery cell assembly die core 7, the first plane 121 is higher than the positioning plane 71, and the distance c between the first plane 121 and the positioning plane 71 is 1.5 mm - 2.0 mm. For example, the distance between the first plane 121 and the positioning plane 71 can be 1.5 mm, 1.6 mm, 1.65 mm, 1.7 mm, 1.8 mm, 1.9 mm or 2 mm, etc.

[0048] Optionally, the battery cell assembly die core 7 can be a structure for fixing the pole column 1 in a device for assembling the cover plate assembly. When assembling the cover plate assembly, the two positioning platforms 13 of the pole column 1 are respectively arranged in the two positioning grooves 72 to fix the pole column 1. After completing the assembly of the pole column 1, the light aluminum sheet 3, the upper plastic part 4, the sealing ring 5 and the connecting piece 6, the cover plate assembly can be removed, so that the pole column 1 is separated from the battery cell assembly die core 7.

[0049] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A terminal post, characterized in that, The terminal post includes a terminal post body, a base, and two positioning platforms. The base includes a first plane and a second plane that face away from each other in a first direction. The terminal post body is fixed on the first plane. The two positioning platforms are respectively fixed on both sides of the base in a second direction. The side of the positioning platform facing away from the terminal post in the first direction is higher than the second plane. The first direction intersects with the second direction.

2. The terminal post according to claim 1, wherein, The positioning platform includes a third plane and a fourth plane that face away from each other in the first direction. The first plane is flush with the third plane. The distance between the first plane and the second plane is less than the distance between the third plane and the fourth plane.

3. The terminal post according to claim 2, characterized in that, The distance between the second plane and the fourth plane is 0.5 mm - 1.0 mm.

4. The terminal post according to any one of claims 1-3, characterized in that, The size of the positioning platform in a third direction is smaller than the size of the base in the third direction. The third direction intersects with the plane determined by the first direction and the second direction.

5. A cover plate assembly, characterized in that, The cover plate assembly includes the terminal post according to any one of claims 1-4.

6. The cover plate assembly according to claim 5, wherein The cover plate assembly further includes a lower plastic part. The lower plastic part includes a first placement groove and a through hole. The through hole penetrates through the lower plastic part. The through hole is communicated with the first placement groove. The base is located in the first placement groove. The terminal post body passes through the through hole.

7. The cover plate assembly according to claim 6, wherein The lower plastic part further includes two second placement grooves. The two second placement grooves are respectively located on both sides of the first placement groove in the second direction. The two positioning platforms respectively correspond to the two second placement grooves. A part of the positioning platform is located in the corresponding second placement groove, and the other part protrudes from the corresponding second placement groove.

8. A core assembly die core, characterized in that, The battery cell assembly die core is used to fix the terminal post according to any one of claims 1-4. The battery cell assembly die core includes a positioning plane and two positioning grooves. The positioning grooves are recessed from the positioning plane towards the inside of the battery cell assembly die core along the first direction. The two positioning grooves are arranged at intervals along the second direction. The two positioning platforms respectively correspond to the two positioning grooves. A part of the positioning platform is located in the corresponding positioning groove.

9. The cell assembly die core according to claim 8, characterized in that, The size of the positioning groove in the first direction is 0.3 mm - 0.5 mm.

10. The cell assembly die core according to claim 9, wherein, The first plane is higher than the positioning plane. The distance between the first plane and the positioning plane is 1.5 mm - 2.0 mm.

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