Battery monomer, battery and electric equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a battery monomer, a battery and electric equipment. The battery monomer comprises a shell, an electrode assembly, a connecting piece, a confluence plate and a cover body, the connecting piece comprises a first mounting part and a second mounting part, a first distance between a first surface and the electrode assembly along a first direction is smaller than a second distance between a second surface and the electrode assembly along the first direction, and the first surface is a surface, far away from the electrode assembly, of the first mounting part; the second surface is the surface, away from the electrode assembly, of the second installation part, the convergence disc is arranged on the first surface and connected with the electrode assembly, and the cover body is arranged on the second surface. The confluence plate is connected with the edge of the opening of the shell through the connecting piece, so that the confluence plate does not need to be connected with the edge of the opening of the shell by adopting a complicated edge bending structure, the structure of the confluence plate is simplified, and the assembly process difficulty of the confluence plate is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to battery cells, batteries and electrical equipment. Background Art

[0002] With the development of power batteries, people have higher requirements in pursuit of fast charging, lifespan, battery life, cost-effectiveness, safety, etc. In addition to increasing the battery volume, reducing process steps and optimizing the structure during the manufacturing process can also improve composition efficiency, reduce costs, and improve space utilization.

[0003] The most common steel-shell cylindrical battery has tabs at both ends. During the assembly process, the busbar is welded to the tab and the end of the shell respectively. In the current structure, the busbar is mostly bent from the end of the shell to the position of the tab, resulting in a complex structure of the bent busbar and a difficult assembly process. Utility Model Content

[0004] In view of this, the present application provides a battery cell, a battery, and an electrical device, which can simplify the busbar structure and reduce the difficulty of the assembly process of the busbar.

[0005] In a first aspect, the present application provides a battery cell, comprising: a shell having an opening at one end; an electrode assembly disposed in the shell; a connector disposed at the opening of the shell, the connector comprising at least a first mounting portion and a second mounting portion connected to each other, a side of the first mounting portion away from the electrode assembly being a first surface, and a side of the second mounting portion away from the electrode assembly being a second surface; a first distance between the first surface and the electrode assembly along a first direction being smaller than a second distance between the second surface and the electrode assembly along the first direction; a busbar disposed on the first surface and connected to the electrode assembly; and a cover disposed on the second surface.

[0006] In combination with the first aspect, in a possible implementation, the battery cell has an axis along the first direction, the first mounting portion and the second mounting portion are arranged in a ring shape around the axis at the opening of the shell, and the first surface and the second surface form a step structure in the first direction, and at least part of the busbar overlaps the step structure.

[0007] In combination with the first aspect, in a possible implementation, along the first direction, the distance between the first surface and the second surface is d1, and the thickness of the overlapping portion of the busbar on the step structure is h1, satisfying: d1≥h1.

[0008] In combination with the first aspect, in a possible implementation, the electrode assembly also includes a pole ear; the first mounting portion also includes a third surface located on the opposite side of the first surface, and the distance d2 between the second surface and the third surface satisfies: d2<2.5h1+h2; h2 is the thickness of the portion of the busbar used for welding to the pole ear.

[0009] In combination with the first aspect, in a possible implementation, it also includes: a third mounting portion, arranged between the second mounting portion and the shell, one end of the third mounting portion and the end of the shell along the first direction are welded to each other or integrally formed, and the other end of the third mounting portion is connected to the second mounting portion.

[0010] In combination with the first aspect, in a possible implementation, one end of the third mounting portion away from the shell is bent toward the inner cavity of the shell to form a flange portion, and the flange portion is connected to the second mounting portion.

[0011] In combination with the first aspect, in a possible implementation manner, a portion of the busbar that overlaps the step structure is a first connecting portion, and the first connecting portion is welded to the first surface.

[0012] In combination with the first aspect, in a possible implementation manner, the busbar further includes a second connection portion for connecting a pole lug, and the second connection portion and the first connection portion are connected to each other via a bending portion.

[0013] In a second aspect, the present application provides a battery, comprising the aforementioned battery cell.

[0014] In a third aspect, the present application provides an electrical device comprising the aforementioned battery.

[0015] When the present application is used, the busbar is connected to the edge of the shell opening through a connector, so the busbar does not need to use a complex edge bending structure to connect to the edge of the shell opening, which simplifies the structure of the busbar and reduces the difficulty of the assembly process of the busbar. During the assembly process, the connector is connected to the edge of the shell opening, and the busbar is connected to the first mounting portion, thereby improving the connection reliability between the busbar and the shell. In addition, since there is a height difference between the first surface and the second surface, the first mounting portion and the second mounting portion form a sink structure, and the busbar is assembled in the sink structure, and the sink structure can limit and fix the busbar. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Shown is a partial structural schematic diagram of a battery provided in one embodiment of the present application.

[0017] Figure 2Shown is a partial structural schematic diagram of a battery provided in another embodiment of the present application.

[0018] Figure 3 Shown is a partial structural schematic diagram of a battery provided in another embodiment of the present application.

[0019] Figure 4 Shown is a partial structural schematic diagram of a battery provided in another embodiment of the present application. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] The following description is given to enable those skilled in the art to implement and use the utility model and incorporate it into specific application contexts. Various modifications, as well as various uses in different applications will be readily apparent to those skilled in the art, and the general principles defined herein are applicable to a wide range of embodiments. Thus, the utility model is not limited to the embodiments given herein, but should be granted the broadest scope consistent with the principles and novel features disclosed herein.

[0022] In the following detailed description, many specific details are set forth to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the practice of the present invention need not be limited to these specific details. In other words, well-known structures and devices are shown in block diagram form without detailed display to avoid obscuring the present invention.

[0023] The reader is reminded of all documents and literature filed simultaneously with this specification and open to public inspection, and the contents of all such documents and literature are incorporated herein by reference. Unless otherwise directly stated, all features disclosed in this specification (including any attached claims, abstracts and drawings) can be replaced by alternative features for achieving the same, equivalent or similar purposes. Therefore, unless otherwise explicitly stated, each feature disclosed is only an example of a group of equivalent or similar features.

[0024] Note that, where used, the symbols left, right, front, back, top, bottom, forward, reverse, clockwise and counterclockwise are used only for convenience and do not imply any specific fixed direction. In fact, they are used to reflect the relative position and / or direction between the various parts of the object. In addition, the terms "first" and "second" are used only for descriptive purposes and should not be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Note that, in the case of use, further, preferably, further and more preferably are simple beginnings for explaining another embodiment based on the previous embodiment, and the content of further, preferably, further or more preferably followed by the above embodiment is combined with the previous embodiment as a complete composition of another embodiment. Several further, preferably, further or more preferably settings followed by the same embodiment can be arbitrarily combined to form another embodiment.

[0027] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. Note that the aspects described below in conjunction with the accompanying drawings and specific embodiments are only exemplary and should not be construed as limiting the scope of protection of the present invention.

[0028] With the development of power batteries, people have higher requirements in pursuit of fast charging, lifespan, battery life, cost-effectiveness, safety, etc. In addition to increasing the battery volume, reducing process steps and optimizing the structure during the manufacturing process can also improve composition efficiency, reduce costs, and improve space utilization.

[0029] The most common steel-shell cylindrical battery has tabs at both ends. During the assembly process, the busbar is welded to the tab and the end of the shell respectively. In the current structure, the busbar is mostly bent from the end of the shell to the position of the tab, resulting in a complex structure of the bent busbar and a difficult assembly process.

[0030] In view of this, the present application provides a battery cell, a battery, and an electrical device, which can simplify the busbar structure and reduce the difficulty of the assembly process of the busbar.

[0031] Exemplary battery cells are as follows:

[0032] Figure 1Shown is a partial structural schematic diagram of a battery provided in one embodiment of the present application. Figure 2 Shown is a partial structural schematic diagram of a battery provided in another embodiment of the present application. Figure 4 FIG. 1 is a partial structural schematic diagram of a battery provided by another embodiment of the present application. The present application provides a battery cell. In one embodiment, as Figure 1 , Figure 2 and Figure 4 As shown, the battery cell includes: a shell 1, an electrode assembly (not shown in the figure), a busbar 2, a connector 3 and a cover 4. One end of the shell 1 has an opening. The electrode assembly is arranged in the shell 1. The connector 3 is arranged at the opening of the shell 1, and the connector 3 at least includes a first mounting portion 302 and a second mounting portion 304 connected to each other, and the side of the first mounting portion 302 away from the electrode assembly is a first surface 3021, and the side of the second mounting portion 304 away from the electrode assembly is a second surface 3041; the first distance between the first surface 3021 and the electrode assembly along the first direction is less than the second distance between the second surface 3041 and the electrode assembly along the first direction. The busbar 2 is arranged on the first surface 3021 and connected to the electrode assembly. The cover 4 is arranged on the second surface 3041.

[0033] When this embodiment is used, the busbar 2 is connected to the edge of the opening of the shell 1 through the connecting piece 3, so the busbar 2 does not need to adopt a complex edge bending structure to connect to the edge of the opening of the shell 1, which simplifies the structure of the busbar 2 and reduces the difficulty of the assembly process of the busbar 2. During the assembly process, the connecting piece 3 is connected to the edge of the opening of the shell 1, and the busbar 2 is connected to the first mounting portion 302, thereby improving the connection reliability between the busbar 2 and the shell 1. In addition, since there is a height difference between the first surface 3021 and the second surface 3041, the first mounting portion 302 and the second mounting portion 304 form a sink structure, and the busbar 2 is assembled in the sink structure, and the sink structure can limit and fix the busbar 2.

[0034] The battery cell has an axis along a first direction. Figure 1 and Figure 2 In the figure, the first direction is the up and down direction, that is, the first direction is the height direction of the cylindrical battery, the first mounting portion 302 and the second mounting portion 304 are arranged in a ring shape around the axis at the opening of the shell 1, and the first surface 3021 and the second surface 3041 form a step structure 305 in the first direction, and at least part of the busbar 2 is overlapped on the step structure 305.

[0035] In one embodiment, along the first direction, the distance between the first surface 3021 and the second surface 3041 is d1, and the thickness of the overlapping portion of the bus plate 2 on the step structure 305 is h1, satisfying: d1 ≥ h1, so that the bus plate 2 can be completely sunk into the step structure 305, and the upper surface of the bus plate 2 will not protrude from the second surface 3041. On the one hand, the upper surface of the bus plate 2 can be protected to a certain extent; on the other hand, it can ensure that there is no positional interference between the installation of the bus plate 2 and the cover body 4.

[0036] In one embodiment, the electrode assembly further includes a tab. Figure 2 As shown, the first mounting portion 302 also includes a third surface 3022 located on the opposite side of the first surface 3021, and the distance d2 between the second surface 3041 and the third surface 3022 satisfies: d2<2.5h1+h2; h2 is the thickness of the portion of the busbar 2 used for welding with the tab. The portion of the busbar 2 that is not overlapped on the step structure 305 is used to connect with the tab. The size limit of d2 can improve the internal space utilization, and the step height of the step structure 305 can be compressed as much as possible while ensuring the stable connection of the busbar 2, thereby improving the space utilization of the battery and thus improving the energy density.

[0037] Figure 3 FIG. 1 is a partial structural schematic diagram of a battery provided in another embodiment of the present application. Figure 1 , Figure 2 and Figure 3 As shown, the battery cell further includes a third mounting portion 301, which is disposed between the second mounting portion 304 and the housing 1, one end of the third mounting portion 301 and the end of the housing 1 along the first direction are welded or integrally formed, and the other end of the third mounting portion 301 is connected to the second mounting portion 304. Figure 2 As shown, one end of the third mounting portion 301 away from the housing 1 is bent toward the inner cavity of the housing 1 to form a flange portion 303 , and the flange portion 303 is connected to the second mounting portion 304 .

[0038] In one embodiment, if Figure 1 As shown, the portion of the busbar 2 overlapping the step structure 305 is the first connection portion 201 , and the first connection portion 201 is welded to the first surface 3021 .

[0039] In one embodiment, if Figure 1 As shown, the busbar 2 further includes a second connection portion 202 for connecting a pole lug, and the second connection portion 202 and the first connection portion 201 are connected to each other via a bending portion 203 .

[0040] The assembly process of the present application can adopt the following steps: the connecting member 3 is installed into the shell 1, the third mounting portion 301 of the connecting member 3 is overlapped on the opening of the shell 1, and then the confluence plate 2 is installed so that the first connecting portion 201 of the confluence plate 2 is docked on the first mounting portion 302, and then the cover body 4 is assembled on the confluence plate 2, and the cover body 4 is provided with a liquid injection hole 401 in the middle. After completing the necessary processes such as liquid injection and chemical formation, the sealing nail 5 is installed in the liquid injection hole 401.

[0041] Exemplary batteries and powered devices are as follows:

[0042] The present application also provides a battery and an electrical device. The battery may specifically be a battery module or a battery pack. The battery includes the aforementioned battery cell, and the electrical device includes the aforementioned battery.

[0043] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0044] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0045] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0046] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features of this utility model.

[0047] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: A housing (1) having an opening at one end; An electrode assembly is arranged in the housing (1); A connecting member (3) is arranged at the opening of the shell (1), the connecting member (3) comprising at least a first mounting portion (302) and a second mounting portion (304) connected to each other, the side of the first mounting portion (302) away from the electrode assembly being a first surface (3021), and the side of the second mounting portion (304) away from the electrode assembly being a second surface (3041); a first distance between the first surface (3021) and the electrode assembly along a first direction is smaller than a second distance between the second surface (3041) and the electrode assembly along the first direction; A busbar (2) disposed on the first surface (3021) and connected to the electrode assembly; and The cover body (4) is arranged on the second surface (3041).

2. The battery cell according to claim 1, characterized in that: The battery cell has an axis along the first direction, the first mounting portion (302) and the second mounting portion (304) are arranged in a ring shape around the axis at the opening of the shell (1), and the first surface (3021) and the second surface (3041) form a step structure (305) in the first direction, and at least a portion of the busbar (2) overlaps the step structure (305).

3. The battery cell according to claim 2, characterized in that: Along the first direction, the distance between the first surface (3021) and the second surface (3041) is d1, and the thickness of the overlapping portion of the busbar (2) overlapping the step structure (305) is h1, satisfying: d1≥h1.

4. The battery cell according to claim 3, characterized in that: The electrode assembly also includes a tab; The first mounting portion (302) further comprises a third surface (3022) located on the opposite side of the first surface (3021), and a distance d2 between the second surface (3041) and the third surface (3022) satisfies: d2<2.5h1+h2; h2 is the thickness of a portion of the busbar (2) for welding to the tab.

5. The battery cell according to claim 1, characterized in that: Also includes: The third mounting portion (301) is arranged between the second mounting portion (304) and the shell (1); one end of the third mounting portion (301) and the end of the shell (1) along the first direction are welded to each other or integrally formed; the other end of the third mounting portion (301) is connected to the second mounting portion (304).

6. The battery cell according to claim 5, characterized in that: One end of the third mounting portion (301) away from the shell (1) is bent towards the inner cavity of the shell (1) to form a flange portion (303), and the flange portion (303) is connected to the second mounting portion (304).

7. The battery cell according to claim 2, characterized in that: The portion of the busbar (2) overlapping the step structure (305) is a first connection portion (201), and the first connection portion (201) is welded to the first surface (3021).

8. The battery cell according to claim 7, characterized in that: The busbar (2) further comprises a second connection portion (202) for connecting a pole lug, and the second connection portion (202) and the first connection portion (201) are connected to each other via a bent portion (203).

9. A battery, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 8.

10. An electrical device, characterized in that: Comprising a battery as claimed in claim 9.

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