Battery cell, battery cell module and battery pack

Abstract

The utility model provides a battery cell, a battery cell module and a battery pack, and relates to the field of battery cell structures. According to the utility model, the protruding part and the concave part which correspond to each other are respectively arranged at the positions of the pole and the connecting piece, and the pole and the connecting piece are correspondingly assembled, welded and fixed through the protruding part and the concave part, so that the pole and the connecting piece can be fixed under the condition that a riveting block is not used, and the assembling mode has no influence of instantaneous impulsive force and improves the space utilization rate of the battery cell; in addition, the connecting sheet can serve as a part of the pole structure, so that materials are saved, the internal resistance of a product is reduced, the cost is reduced, and other components can be conveniently connected and fixed. Furthermore, the pole group is also welded with the connecting sheet, so that the current in the battery cell is led out of the battery cell.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery cell structure, in particular to a battery cell, a battery cell module and a battery pack. BACKGROUND

[0002] The electrode structure in the existing battery cell is generally riveted connection of the shell and the pole post, and then the pole post is welded with the connecting piece. However, the stability of the explosion-proof valve is seriously affected due to the instantaneous impact during riveting, thereby affecting the performance of the battery cell. In addition, the axial space of the battery cell is seriously occupied due to the existence of the riveting block, thereby leading to low space utilization of the battery cell and affecting the energy density of the battery cell. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the purpose of the present application is to provide a battery cell, a battery cell module and a battery pack to solve the problem that the riveting assembly method of the electrode of the existing battery cell affects the performance of the battery cell and reduces the space utilization of the battery cell.

[0004] To achieve the above purpose, a first aspect of the present application provides a battery cell, wherein the battery cell comprises:

[0005] a shell, an inside of the shell is provided with a pole group;

[0006] a cover plate assembly connected with the shell; the cover plate assembly comprises a pole post and a connecting piece, the pole post is formed with a protruding portion, the connecting piece is formed with a recess corresponding to the protruding portion, the protruding portion is inserted into the recess and welded with the recess; the pole group is also welded with the connecting piece.

[0007] Preferably, the connecting piece is formed with a pole post connecting portion and a pole group connecting portion connected in sequence along a first direction; the pole post connecting portion is formed as a stepped structure.

[0008] Preferably, the axial direction of the pole post is the same as the axial direction of the pole post connecting portion and both are perpendicular to the first direction; the protruding portion is located at the center of the bottom end of the pole post, and the recess is located at the top of the pole post connecting portion.

[0009] Preferably, the outer side wall of the protruding portion is welded with the inner side wall of the recess.

[0010] Preferably, when the protruding portion is welded with the recess, the bottom end of the pole post is attached to the top end of the pole post connecting portion; the distance between the end face of the protruding portion away from the bottom end of the pole post and the bottom end of the recess is formed as L, L≥0.15mm.

[0011] Preferably, the cover plate assembly further comprises a sealing ring, the sealing ring is correspondingly sleeved on the outer side of the pole post connecting portion, and the axial cross section of the sealing ring is formed as a Z-shaped structure.

[0012] Preferably, the cover plate assembly further comprises an insulating piece sleeved on the outer side of the pole post; the cover plate assembly further comprises an aluminum plate formed with a connecting hole, the pole post, the connecting piece, the sealing ring and the insulating piece are correspondingly assembled with the aluminum plate through the connecting hole, and the aluminum plate is correspondingly connected with the shell.

[0013] Preferably, the pole group is formed with a lug, the lug is folded and welded corresponding to the pole group connecting part.

[0014] According to the second aspect of the present application, an electric core module is provided, wherein the electric core module comprises the electric core as described above.

[0015] According to the third aspect of the present application, a battery pack is provided, wherein the battery pack is provided with the electric core module as described above.

[0016] According to the electric core, the electric core module and the battery pack of the present application, the corresponding protruding part and recess are respectively arranged at the pole post and the connecting piece, the pole post and the connecting piece are correspondingly assembled and welded and fixed through the protruding part and the recess, so that the pole post and the connecting piece can be fixed without using a riveting block, the assembling mode has no instantaneous force influence and improves the space utilization rate of the electric core; in addition, the connecting piece can act as part of the pole post structure, material is saved, product internal resistance is reduced, cost is reduced, and connection and fixation of other components are facilitated. Further, the pole group is also welded with the connecting piece to lead out the current inside the electric core to the outside of the electric core.

[0017] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are specifically described below, and the accompanying drawings are described in detail as follows. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the present application, and should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Fig. 1 is a sectional view of an electric core according to an embodiment of the present application;

[0020] Fig. 2 is an enlarged schematic view of A according to an embodiment of the present application;

[0021] Fig. 3 is a partial schematic view of an electric core according to an embodiment of the present application.

[0022] Figure: 1 - housing; 2 - pole group; 20 - tab; 30 - light aluminum plate; 31 - insulating piece; 32 - sealing ring; 330 - positive pole post; 331 - negative pole post; 332 - protrusion; 340 - positive pole connecting piece; 341 - negative pole connecting piece; 342 - pole post connecting part; 343 - pole group connecting part. DETAILED DESCRIPTION

[0023] The following detailed description is presented to aid the reader in gaining a comprehensive understanding of the methods, apparatuses, and / or systems described herein. However, various changes, modifications, and equivalents can be used, and the

[0024] The features described herein can be implemented in different forms and should not be construed as limited to the examples described herein. Rather, these examples have been provided so that this disclosure will be thorough and complete, and will fully convey the scope of the methods, apparatuses, and / or systems to those skilled in the art. Further, the description should not be interpreted as a general abatement of equivalents or other claims.

[0025] Throughout the specification, when an element (such as a layer, region, or substrate) is referred to as being "on", "connected to", "coupled to", "bonds to", "on top of", or "covering" another element, it can be directly on, connected to, coupled to, bonds to, on top of, or covering the other element, or one or more other elements can be interposed therebetween. In contrast, when an element is referred to as being "directly on", "directly connected to", "directly coupled to", "directly bonds to", "directly on top of", or "directly covering" another element, there are no other elements interposed therebetween.

[0026] As used herein, the term "and / or" includes any one of the listed items and any combination of any two or more of the listed items.

[0027] Although terms such as "first" and "second" and "third" can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, elements, components, regions, layers and / or sections described herein as being called a first element, component, region, layer or section can also be called a second element, component, region, layer or section, without departing from the teachings of the examples.

[0028] For ease of description, spatial relationship terms such as "on", "upper", "under", and "lower" can be used herein to describe the relationship between one element and another element as shown in the drawings. Such spatial relationship terms are intended to include, in addition to the orientation depicted in the drawings, different orientations of the device in use or operation. For example, if the device in the drawings is turned over, the element described as being "on" or "upper" relative to another element would then be "under" or "lower" relative to the other element. Therefore, the term "on" includes both "on" and "under" depending on the spatial orientation of the device. The device can 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.

[0029] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has", "having" and the like are inclusive and open-ended and specify the presence of stated features, integers, operations, components, elements, and / or groups but do not preclude the presence or addition of one or more other features, integers, operations, components, elements, and / or groups thereof.

[0030] Variations in the shapes illustrated in the drawings can occur as a result of manufacturing processes and / or tolerances. Thus, the examples described herein are not limited to the precise shapes illustrated in the drawings, but include variations in shapes that occur as a result of manufacturing processes.

[0031] Features of the examples described herein can be combined with one another as would be apparent to one of ordinary skill in the art after understanding the disclosure provided herein. Furthermore, although examples are described herein with various configurations, other configurations are possible as would be apparent to one of ordinary skill in the art after understanding the disclosure provided herein.

[0032] According to the utility model provides a kind of electric core, such as Figs. 1-3As shown, the battery cell in the embodiment includes a shell 1 and a cover plate assembly connected with the shell 1, the inside of the shell 1 is provided with a pole group 2, and the pole group 2 is also connected with the cover plate assembly to realize the conduction of current. In addition, the cover plate assembly in the embodiment includes a pole and a connecting piece, both of which are assembled and fixed by welding to improve the space utilization of the battery cell and ensure the performance of the battery cell. In the following, the specific structure and assembly relationship of each part of the battery cell according to the utility model will be described in detail.

[0033] As shown, Figs. 1-2 The cover plate assembly in the embodiment includes an aluminum plate 30, which extends in a first direction, and along the first direction, the aluminum plate 30 is formed with two spaced apart connecting holes to facilitate the assembly of the following pole and other components; in addition, the aluminum plate 30 is connected with the shell 1 to form a sealed inner cavity of the battery cell. The cover plate assembly further includes a positive pole 330 and a negative pole 331, in particular, the positive pole 330 in the embodiment is formed as an aluminum material piece, while the negative pole 331 is formed as a copper-aluminum composite pole and its axis direction is close to the bottom end of the pole group 2. Formed as a copper material, so as to avoid corrosion and other situations of the pole, so as to ensure the safety of the battery cell. It should be noted that the structure of the negative pole 331 is simple, which can be formed by stamping process once, thereby effectively reducing the cost. In addition, the axis direction of the positive pole 330 and the negative pole 331 is perpendicular to the above-mentioned first direction.

[0034] In addition, the bottom center of the axis direction of the positive pole 330 and the negative pole 331 is respectively formed with a protrusion 332, and correspondingly, the connecting piece in the embodiment includes a positive connecting piece 340 and a negative connecting piece 341 corresponding to the positive pole 330 and the negative pole 331 respectively, the positive connecting piece 340 and the negative connecting piece 341 are respectively formed with a recess corresponding to the protrusion 332, the protrusion 332 is inserted into the recess and welded with the recess, so as to realize the corresponding connection of the pole and the connecting piece.

[0035] Specifically, as shown, Fig. 2As shown, taking the negative connection sheet 341 and the negative post 331 as an example, the negative connection sheet 341 is formed with a post connecting portion 342 and a pole group connecting portion 343 connected in sequence along the first direction, the (outer side of the) post connecting portion 342 is formed in a stepped structure to facilitate stable assembly of the sealing ring 32 described below; in addition, the axis of the post connecting portion 342 is collinear with the axis of the negative post 331, thereby facilitating the stability of the overall structure of the battery cell. More specifically, the bottom end of the axis direction of the post connecting portion 342 is formed with a stepped recess structure, and the top end of the axis direction of the post connecting portion 342 is formed with the recess, that is, the recess penetrates into the recess structure, so when the negative post 331 is assembled with the negative connection sheet 341, first extend the protruding portion 332 into the recess and make the bottom end of the negative post 331 fit with the top end of the post connecting portion 342 of the negative connection sheet 341, and then weld the outer side wall of the protruding portion 332 with the inner side wall of the recess, further, it is also necessary to ensure that the distance L between the end face of the bottom end of the protruding portion 332 away from the post and the bottom end of the recess is not less than 0.15mm (i.e. L≥0.15mm), to avoid the occurrence of the situation that the welding point protrudes.

[0036] It should be noted that the structure, specification, etc. of the positive connection sheet 340 and the negative connection sheet 341 are consistent, and will not be described again.

[0037] In addition, the cover plate assembly in the embodiment also includes and the insulating part 31, like Figs. 1-2 As shown, the sealing ring 32 is correspondingly sleeved on the outer side of the post connecting portion 342 of the positive sheet and the negative sheet, the axial cross section of the sealing ring 32 is formed in a Z-shaped structure, so that the inner ring of the sealing ring 32 can ensure the sealing between the bottom end of the positive post 330 and the negative post 331 and the corresponding positive connection sheet 340 and negative connection sheet 341, to prevent defects such as welding spark from causing the battery cell to leak; the outer ring of the sealing ring 32 can ensure the sealing between the positive post 330 and the negative post 331 and the light aluminum plate 30.

[0038] In addition, the cover plate assembly also includes an insulating part 31 sleeved on the outer side of the positive post 330 and the negative post 331. When the cover plate assembly is assembled, the insulating part 31, the positive post 330 and the negative post 331 are assembled from above the light aluminum plate 30, and the sealing ring 32, the positive connection sheet 340 and the negative connection sheet 341 are assembled from below the light aluminum plate 30. It should be noted that the specific assembly scheme of each component in the battery cell cover plate belongs to the conventional technical means in the art, and therefore will not be described again.

[0039] As described above, as shown in Fig. 3 As shown, the pole lug 20 in the embodiment of the application extends out of the pole group 2 and is folded over the top of the pole group connecting portion 343, and then the pole lug 20 is welded to the pole group connecting portion 343 to realize current conduction.

[0040] According to the electric core of the utility model, corresponding protruding part 332 and recess are arranged at the pole and the connecting piece respectively, the pole and the connecting piece are assembled and welded fixedly through the protruding part 332 and the recess, so the pole and the connecting piece can be fixed without using riveting block, the assembling mode has no instantaneous force influence and improves the space utilization of the electric core; in addition, the connecting piece can act as part of the pole structure after being welded with the corresponding pole, saves the material, reduces the product internal resistance, reduces the cost and can be convenient for the connection and fixation of other components. Further, the pole group 2 is also welded with the corresponding connecting piece to lead out the current inside the electric core to the outside of the electric core.

[0041] According to the second aspect of the utility model, an electric core module is provided, wherein the electric core module comprises the electric core as described above.

[0042] According to the third aspect of the utility model, a battery pack is provided, wherein the battery pack is provided with the electric core module as described above.

[0043] Finally, it should be noted that: the above-described embodiments are merely specific embodiments of the present application, used to illustrate the technical solutions of the present application, and not to limit them, the protection scope of the present application is not limited thereto, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand: any person skilled in the art in the technical range disclosed by the present application, it can still modify or easily think of changes to the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications, changes or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and all should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be the protection scope of the claims.

Claims

1. An electric cell, characterized by, The electric core comprises: a shell, an inside of the shell is provided with a pole group; a cover plate assembly connected with the shell; the cover plate assembly comprises a pole post and a connecting sheet, the pole post is formed with a protruding part, the connecting sheet is formed with a recess part corresponding to the protruding part, the protruding part is inserted into the recess part and welded with the recess part; the pole group is also welded with the connecting sheet.

2. The electric cell of claim 1, wherein, The connecting sheet is formed with a pole post connecting part and a pole group connecting part connected in sequence along a first direction; the pole post connecting part is formed as a stepped structure.

3. The electric cell of claim 2, wherein, The axial direction of the pole post and the axial direction of the pole post connecting part are the same and both are perpendicular to the first direction; the protruding part is located at the center of the bottom end of the pole post, and the recess part is located at the top of the pole post connecting part.

4. The electric cell of claim 3, wherein, The outer side wall of the protruding part is welded with the inner side wall of the recess part.

5. The electric cell of claim 3, wherein, When the protruding part is welded with the recess part, the bottom end of the pole post is fitted with the top end of the pole post connecting part; the distance between the end face of the protruding part away from the bottom end of the pole post and the bottom end of the recess part is formed as L, L≥0.15mm.

6. The electric cell of claim 2, wherein, The cover plate assembly further comprises a sealing ring, the sealing ring is correspondingly sleeved on the outer side part of the pole post connecting part, and the axial section of the sealing ring is formed as a Z-shaped structure.

7. The electric cell of claim 6, wherein, The cover plate assembly further comprises an insulating piece sleeved on the outer side part of the pole post; the cover plate assembly further comprises an aluminum plate formed with a connecting hole, the pole post, the connecting sheet, the sealing ring and the insulating piece are correspondingly assembled with the aluminum plate through the connecting hole, and the aluminum plate is correspondingly connected with the shell.

8. The electric cell of claim 2, wherein, The pole group is formed with a tab, the tab is folded and welded with the pole group connecting part.

9. An electrochemical cell module, characterized by, The electric core module comprises the electric core as claimed in any one of claims 1 to 8.

10. A battery pack, characterized by, The battery pack is provided with the electric core module as claimed in claim 9.

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