CN210073953U

CN210073953U - Cylindrical aluminum shell battery and battery module

Info

Publication number: CN210073953U
Application number: CN201920859665.6U
Authority: CN
Inventors: 龚晓冬; 许玉林; 王爱淑; 娄豫皖; 许袆凡
Original assignee: Suzhou Ankao Energy Co Ltd
Current assignee: Suzhou Ankao Energy Co Ltd
Priority date: 2019-06-10
Filing date: 2019-06-10
Publication date: 2020-02-14
Anticipated expiration: 2029-06-10

Abstract

The application discloses cylindrical aluminum hull battery and battery module, cylindrical aluminum hull battery includes: the battery case is cylindrical, at least one end of the battery case is open, and the battery case is made of aluminum; the battery case is provided with a first end and a second end which are deviated from each other in the axial direction, the first end is of an open structure, a negative electrode cap which is in conductive connection with the negative electrode of the inner core is fixed at the open position of the first end of the battery case in a closed mode, the battery case is in conductive connection with the positive electrode of the inner core, and the negative electrode cap is arranged in an insulating mode with the battery case; the outer part of the second end of the battery case is provided with a steel sleeve fixedly connected with the battery case in an abutting mode. The application solves the corrosion problem of the conductive steel sheet and the battery butt part in the battery module.

Description

Cylindrical aluminum shell battery and battery module

Technical Field

The application relates to a cylindrical aluminum-shell battery and a battery module.

Background

The battery module is mainly formed by connecting a plurality of battery monomers in series or/and in parallel, and when the battery module is assembled, the battery monomers are usually connected with each other by means of a stainless steel conducting strip. The positive electrode welding-free battery module utilizes a conductive elastic sheet made of stainless steel to circumferentially hold a battery shell with positive electricity on a battery monomer, and the conductive elastic sheet is directly connected with the battery shell by utilizing circumferential clamping force. And the other side of the conductive elastic sheet is welded and fixed with the negative electrode cap of the other battery monomer, so that the two battery monomers are connected in series.

However, some batteries have aluminum battery cases and conductive elastic sheets between the batteries are made of steel, and because the two batteries are made of different materials, the two batteries have larger potential difference and the contact area between the conductive elastic sheets and the battery cases is smaller, and the two batteries abut against the connection part to corrode after being used for a period of time.

Disclosure of Invention

The purpose of the application is: a cylindrical aluminum shell battery with a novel structure and a battery module with the battery are provided, and the problem of corrosion of a contact part of a conductive steel sheet and the battery in the battery module is solved.

The technical scheme of the application is as follows:

a cylindrical aluminum-can battery comprising:

a cylindrical battery can which is open at least at one end and is made of aluminum, an

An inner core housed in the battery case;

the battery case is provided with a first end and a second end which are deviated from each other in the axial direction, the first end is of an open structure, a negative electrode cap which is in conductive connection with the negative electrode of the inner core is fixed at the open position of the first end of the battery case in a closed mode, the battery case is in conductive connection with the positive electrode of the inner core, and the negative electrode cap is arranged in an insulating mode with the battery case;

the outer part of the second end of the battery case is provided with a steel sleeve fixedly connected with the battery case in an abutting mode.

On the basis of the technical scheme, the application also comprises the following preferable scheme:

the steel sleeve is welded and fixed with the battery shell.

The steel jacket is composed of:

a circular bottom wall, and

the annular ring wall integrally extends from the outer edge of the bottom wall in the axial direction and surrounds the periphery of the bottom wall;

the annular wall is arranged outside the second end of the battery shell in an abutting and sleeving mode.

the second end of the battery case is of an open structure, a positive electrode cap which is in conductive connection with the positive electrode of the inner core is fixedly sealed at the opening of the second end of the battery case, and the bottom wall is connected with the positive electrode cap in an abutting mode.

The second end of the battery shell is a closed end with a shell bottom, and the bottom wall is connected with the shell bottom in an abutting mode.

An insulating sealing ring for insulating and separating the battery shell and the negative electrode cap is arranged between the battery shell and the negative electrode cap.

A battery module, comprising:

the battery clamp is provided with a battery inserting hole;

the conductive steel sheet is of an integrated structure and is embedded in the battery insertion hole, and the conductive steel sheet consists of a bottom sheet and a plurality of elastic claws which are integrally arranged on the periphery of the bottom sheet and are arranged at intervals along the circumferential direction; and

the cylindrical battery of the above structure;

the steel sleeve is inserted into the battery insertion hole and is surrounded by the elastic claws on the conductive steel sheet in an abutting mode.

The application has the advantages that:

the steel bushing is fixedly sleeved outside the charged aluminum battery case of the battery, the steel conductive steel sheet in the battery module is abutted and contacted with the steel bushing on the battery, the steel-steel contact is conductive, and the potential difference is basically zero, so that the corrosion phenomenon of the abutted part of the conductive steel sheet and the battery is eliminated. In addition, because the steel sleeve and the battery case can be in large-area conductive contact, although the steel sleeve and the battery case are made of different materials, the corrosion phenomenon is not obvious because the flow area is large. In addition, the abutting part of the steel sleeve and the battery shell is relatively sealed, so that impurities are not easy to enter, and the corrosion problem is further reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a battery module according to an embodiment of the present application;

fig. 2 is an exploded view of a battery module in the embodiment of the present application;

FIG. 3 is a schematic perspective view of a battery according to an embodiment of the present invention;

fig. 4 is an exploded view of a battery in an embodiment of the present application;

wherein: 1-battery case, 2-negative electrode cap, 3-steel sleeve, 301-bottom wall, 302-annular wall, 4-battery clamp, 401-battery insertion hole, 5-conductive steel sheet, 501-bottom sheet, 502-elastic claw, 6-parallel networking.

Detailed Description

The present application will be described in further detail below with reference to the accompanying drawings by way of specific embodiments. The present application may be embodied in many different forms and is not limited to the embodiments described in the present embodiment. The following detailed description is provided to facilitate a more thorough understanding of the present disclosure, and the words used to indicate orientation, top, bottom, left, right, etc. are used solely to describe the illustrated structure in connection with the accompanying figures.

One skilled in the relevant art will recognize, however, that one or more of the specific details can be omitted, or other methods, components, or materials can be used. In some instances, some embodiments are not described or not described in detail.

Furthermore, the technical features, aspects or characteristics described herein may be combined in any suitable manner in one or more embodiments. It will be readily appreciated by those of skill in the art that the order of the steps or operations of the methods associated with the embodiments provided herein may be varied. Thus, any sequence in the figures and examples is for illustrative purposes only and does not imply a requirement in a certain order unless explicitly stated to require a certain order.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).

Fig. 1 and 2 show an embodiment of the battery module according to the present invention, and like the conventional battery module, the battery module also includes a battery holder 4 (or battery support), a parallel net 6, a plurality of conductive steel sheets 5 and a plurality of batteries, and for the reader's clarity, only one metal conductive sheet 4 and one battery are shown in fig. 2. Wherein:

the battery holder 4 is an integral injection molding structure, and only has a plurality of battery insertion holes 401 arranged in a matrix. The conductive steel sheets 5 are fitted into the battery insertion holes 401, respectively. The conductive steel sheet 5 is an integrated structure, and is composed of a circular bottom plate 501 and a plurality of elastic claws 502 integrally arranged around the bottom plate and arranged at intervals along the circumferential direction. The cells are arranged in a matrix shape, and the right end of each cell is inserted into the cell insertion hole 401 of the cell clamp.

In fig. 1 and 2, the battery holder 4 is further formed at its left end surface with slits for interconnecting the battery insertion holes 401, and the metallic parallel net 6 is fitted into the slits and the battery insertion holes and is in conductive contact with the base plate 501 of each of the metallic conductive sheets 5. The function of the parallel network 6 is to connect the individual cells in parallel.

The battery is a cylindrical lithium ion aluminum-shell battery which comprises a cylindrical aluminum battery shell 1, obviously, the cylindrical battery shell 1 is provided with a first end and a second end which are positioned at two sides which are deviated from each other in the axial direction, and one end of the battery shell 1 is open and the other end is closed in the embodiment, specifically: the first end is an open structure and the second end is a closed end with a shell bottom. An inner core (not shown in the figure) formed by winding a positive plate, a negative plate and a diaphragm is arranged in the battery case 1, an opening at the first end of the battery case 1 is sealed and fixed with a negative electrode cap 2, and the negative electrode cap is electrically connected with a negative electrode of the inner core through a tab (or a current collecting disc), so that the negative electrode cap 2 is charged negatively. And the battery case 1 of aluminum is electrically connected to the positive electrode of the core, so that the battery case 1 is negatively charged. In order to prevent short-circuiting, an insulating gasket (not shown) for insulating and separating the battery can 1 and the negative electrode cap 2 is interposed between them.

Referring to fig. 3 and 4, the key improvement of this embodiment is that the second end of the battery case 1 is externally and tightly sleeved with a steel sleeve 3, i.e. a steel sleeve, fixedly connected with the battery case. The steel sleeve 3 is inserted into the battery insertion hole 401, and the steel sleeve 3 is tightly and closely embraced by each elastic claw 502 on the conductive steel sheet 5 inserted into the battery insertion hole 401, so that the conductive connection between the battery anodes and the conductive steel sheets 5 is realized, and the parallel network 6 is in conductive contact with the bottom sheets 501 of the conductive steel sheets 5, so that the interconnection of the battery anodes, namely the parallel connection of the anodes of the batteries is realized.

The steel sleeve 3 and the battery case 1 may be fixedly connected by interference fit, may be adhesively fixed by an adhesive, or may be fixedly connected by welding.

In practical application, a group of cylindrical batteries arranged in a matrix shape (for convenience of describing the solution of the present embodiment, these cylindrical batteries are referred to as right batteries) is usually arranged on the right side of the battery clamp 4 in fig. 1, the negative end of the left side of the right battery is inserted into the battery insertion hole 401 of the battery clamp 4 to the left and is welded and fixed with the bottom plate of the conductive steel sheet 5, the right end (steel sleeve end) of the left battery shown in fig. 1 is inserted into the battery insertion hole 401 to the right, and the steel sleeve 3 on the right end of the left battery is tightly embraced by the elastic claws 502 on the conductive steel sheet 5, so as to achieve the series connection between the left battery and the right battery.

After the assembly is finished, each elastic claw 502 of the conductive steel sheet 5 is tightly clamped between the hole wall of the battery insertion hole 401 and the outer peripheral surface of the steel sleeve 3, and the steel sleeve 3 can be separated from the battery insertion hole 401 only by applying a large axial drawing force, so that the cylindrical battery can be stably and reliably connected with a battery clamp without welding the conductive steel sheet 5 and the steel sleeve 3, and meanwhile, the conductive steel sheet 5 and the steel sleeve 3 have good conductive stability

As shown in fig. 4, the steel sleeve 3 is a unitary structure, and is composed of a cylindrical bottom wall 301 and an annular wall 302, wherein the annular wall 302 is formed by integrally and axially extending from an annular outer edge of the bottom wall 301, and the annular wall 302 surrounds the periphery of the bottom wall 301. Wherein the annular wall 302 is closely sleeved outside the second end of the battery case 1.

As already described above, the second end of the battery can 1 is a closed end with a bottom that is part of the battery can 1, which is also positively charged. In the embodiment, the bottom wall 301 of the steel sleeve 3 is abutted against the shell bottom of the closed end to reduce the connection resistance of the steel sleeve 3 and the battery shell 1, and simultaneously, the connection stability of the steel sleeve 3 and the battery shell 1 is improved.

Of course, the second end of the battery case 1 may be open (i.e. both ends of the battery case 1 are open), and the opening of the second end of the battery case 1 is closed and fixed with a positive electrode cap, which is electrically connected with the positive electrode of the inner core. In this case, it is preferable to connect the bottom wall 301 of the steel sleeve 3 against the aforementioned positive electrode cap.

The above embodiments are only for illustrating the technical concepts and features of the present application, and the purpose of the embodiments is to enable people to understand the content of the present application and implement the present application, and not to limit the protection scope of the present application. All equivalent changes and modifications made according to the spirit of the main technical scheme of the application are covered in the protection scope of the application.

Claims

1. A cylindrical aluminum-can battery comprising:

a cylindrical battery case (1) of aluminum having at least one open end, and

an inner core housed in the battery case;

the battery case (1) is provided with a first end and a second end which are deviated from each other in the axial direction, the first end is of an open structure, a negative electrode cap (2) which is in conductive connection with the negative electrode of the inner core is fixed at the opening of the first end of the battery case (1) in a closed mode, the battery case (1) is in conductive connection with the positive electrode of the inner core, and the negative electrode cap (2) is arranged in an insulating mode with the battery case (1);

the battery is characterized in that a steel sleeve (3) fixedly connected with the battery shell is sleeved outside the second end of the battery shell (1) in an attached mode.

2. The cylindrical aluminum-can battery according to claim 1, wherein the steel sleeve (3) is welded and fixed to the battery can (1).

3. The cylindrical aluminum-can battery of claim 1, wherein the steel sleeve (3) is made of:

a circular bottom wall (301), and

the annular ring wall (302) integrally extends from the outer edge of the bottom wall in the axial direction and surrounds the periphery of the bottom wall;

the annular wall (302) is closely sleeved outside the second end of the battery shell (1).

4. The cylindrical aluminum-can battery according to claim 3, wherein the second end of the battery can (1) is in an open structure, and a positive cap conductively connected with the positive electrode of the inner core is fixed at the opening of the second end of the battery can (1) in a closed manner, and the bottom wall (301) is in abutting connection with the positive cap.

5. The cylindrical aluminum can cell as defined in claim 3 wherein the second end of the cell can (1) is a closed end with a can bottom against which the bottom wall (301) is connected.

6. The cylindrical aluminum-can battery according to claim 1, wherein an insulating sealing ring for insulating and separating the battery can (1) and the negative electrode cap (2) is clamped between the battery can and the negative electrode cap.

7. A battery module, comprising:

the battery clamp (4) is provided with a battery inserting hole (401);

the conductive steel sheet (5) is embedded in the battery insertion hole (401) and is of an integrated structure, and the conductive steel sheet (5) is composed of a bottom sheet (501) and a plurality of elastic claws (502) which are integrally arranged on the periphery of the bottom sheet and are arranged at intervals along the circumferential direction; and

a battery;

the cylindrical aluminum-shell battery is characterized in that the battery is the cylindrical aluminum-shell battery as claimed in any one of claims 1 to 6, the steel sleeve (3) is inserted into the battery insertion hole (401) and is abutted and encircled by the elastic claws (502) on the conductive steel sheet (5).