CN210692657U

CN210692657U - Current collecting plate, battery cap and cylindrical battery

Info

Publication number: CN210692657U
Application number: CN201921196382.4U
Authority: CN
Inventors: 黄伟东; 娄豫皖; 许玉林; 王爱淑; 张朋; 张瑞; 陈永杰
Original assignee: Suzhou Ankao Energy Co Ltd
Current assignee: Shanghai Qike Network Technology Co ltd
Priority date: 2019-07-26
Filing date: 2019-07-26
Publication date: 2020-06-05
Anticipated expiration: 2029-07-26

Abstract

The application discloses a current collecting disc, a battery cap and a cylindrical battery, wherein the current collecting disc comprises a disc body and a tail body, one end of the tail body is integrally connected with the disc body; the disc body is provided with a plane surface and a first bulge protruding out of the plane surface, the tail body is provided with a plane surface and a second bulge protruding out of the plane surface, the first bulge is in abutting contact with the plane surface of the tail body, and the second bulge is in abutting contact with the plane surface of the disc body. This application has increased the water conservancy diversion area and the heat conduction area of battery current collector, and then has reduced the internal resistance of battery, promotes the heat-sinking capability that the battery had.

Description

Current collecting plate, battery cap and cylindrical battery

Technical Field

The application relates to a current collecting disc, a battery cap and a cylindrical battery.

Background

The requirements of new energy automobiles on endurance mileage and quick charging require that lithium batteries have high specific energy and must also have high specific power requirements. In order to realize the quick charge of the lithium battery and shorten the charging time, the large-current charging capacity of the battery needs to be improved. The bottleneck influencing the large-current charging and discharging capacity in the lithium battery is mainly on a tab bundle, a current collecting disc and a connecting sheet at the confluence part. For a cylindrical battery of the full-lug battery, a connecting sheet on a battery cover plate is a weak link of the current-guiding capacity, and the current-guiding capacity of the battery is determined. The connecting sheet leads the current collected by the lug and the current collecting disc out to the positive and negative terminals of the battery. When the battery is charged and discharged by heavy current, the connecting sheet has the largest heat productivity, and plays a key role in charging and discharging the battery by heavy current. The positive electrode of the cylindrical battery pole lug with the full pole lug is a pure aluminum foil, and the negative electrode of the cylindrical battery pole lug with the full pole lug is a pure copper foil, so that the large-current conductive capacity can be met. However, the soft connecting sheet for connecting the tab and the cover plate needs to be folded during production and assembly, so that the connecting sheet cannot be too thick, the width of the connecting sheet is limited by the diameter of the battery and cannot be widened, and the defect of weak flow conductivity in the soft connecting sheet cannot be completely overcome by adopting a multi-sheet stacking mode. Even if widen the thickening with the connection piece and satisfied the water conservancy diversion requirement, the connection piece is bent the difficulty, and the space of bending lets the inside heat-conduction of battery obstructed, and the battery heat dissipation is poor, and it is fast to cause the battery to be located the temperature rise at the connection piece to finally make the battery temperature high, appear thermal runaway when serious.

Disclosure of Invention

The purpose of the application is: to the above problem, a current collecting disc, a battery cap and a cylindrical battery with novel structures are provided to increase the flow guide area and the heat conduction area of the battery current collecting disc, so that the internal resistance of the battery is reduced, and the heat dissipation capacity of the battery is improved.

The technical scheme of the application is as follows:

a collector plate comprising:

a tray body, and

a tail body with one end integrally connected with the tray body;

the disc body is provided with a plane surface and a first bulge protruding out of the plane surface, the tail body is provided with a plane surface and a second bulge protruding out of the plane surface, the first bulge is in abutting contact with the plane surface of the tail body, and the second bulge is in abutting contact with the plane surface of the disc body.

The first protrusion and the second protrusion have the same height.

A battery cap comprises a circular cover plate and a current collecting plate with the structure, and the other end of the tail body is fixedly connected with the circular cover plate.

The outer edge of the tray body is a flange which extends out perpendicularly towards the circular cover plate, and the circular cover plate and the flange are arranged in an abutting mode in the axial direction of the circular cover plate.

The outer contour of the tray body is circular.

The other end of the tail body is welded and fixed with the circular cover plate.

The other end of the tail body is riveted and fixed with the round cover plate.

A cylindrical battery comprising:

a cylindrical battery case having a cylindrical shape and a cylindrical shape,

a battery core accommodated in the battery case, and

the battery cap with the structure is fixed at the opening at the end part of the battery shell in a closed manner;

the disk body is welded and fixed with the positive electrode or the negative electrode of the battery inner core, and the outer edge of the circular cover plate is in sealing fit with the opening of the end part of the battery case.

The application has the advantages that:

1. the first bulge on the collector disc body is abutted and contacted with the plane surface of the collector disc tail body, and the second bulge on the collector disc tail body is abutted and contacted with the plane surface of the collector disc body, so that the flow guide area of the collector disc is increased, the overcurrent capacity of the collector disc is enhanced, the internal resistance of the battery is further reduced, and the electric energy loss in the battery is reduced. Meanwhile, the axial heat conduction area of the current collecting disc is increased by the structure, so that the temperature rise of the battery under high current is obviously reduced.

2. The outer edge of the collector plate body is a vertically extending flange, and the circular cover plate is axially abutted to the flange, so that the flow capacity and the axial heat conduction capacity of the collector plate are further enhanced.

3. The bulges arranged on the collector body and the tail body have the structure strengthening function, so that the structural strength of the collector body and the tail body is improved.

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 diagram of a battery cap according to an embodiment of the present disclosure after being unfolded;

FIG. 2 is a schematic structural view of a battery cap in an embodiment of the present application when the battery cap is not deployed;

wherein: 100-collector plate, 101-plate body, 102-tail body, 101 a-first bulge, 101 b-flanging, 102 a-second bulge and 200-circular cover plate.

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 a specific example of a battery cap according to the present invention for closing an opening portion of a battery case mounted to a cylindrical battery to be used as a positive electrode cap or a negative electrode cap of the battery. Like some conventional battery caps, the battery cap also includes a circular cover plate 200 and a current collecting plate 100 located inside the circular cover plate, and the current collecting plate 100 is composed of a plate body 101 and a tail body 102, wherein the outer contour of the plate body 101 is circular, one end of the tail body 102 is integrally connected with the plate body 101, and the other end is welded (or fixed by other fixing means, such as riveting) with the circular cover plate 200.

The key improvement of this embodiment is that the tray body 101 has a planar surface and a first protrusion 101a protruding from the planar surface, the tail body 102 has a planar surface and a second protrusion 102a protruding from the planar surface, the first protrusion 101a is in abutting contact with the planar surface (the portion indicated by the lead of reference numeral 102 in fig. 1) of the tail body 102, and the second protrusion 102a is in abutting contact with the planar surface (the portion indicated by the lead of reference numeral 101 in fig. 1) of the tray body 101.

Specifically, the first protrusion 101a is formed by press working the tray body 101, and the second protrusion 102a is formed by press working the tail body 102. The heights of the first protrusion 101a and the second protrusion 102a are preferably substantially the same, so as to ensure that the first protrusion has better fitting property with the tail body and the second protrusion has larger abutting area with the tray body.

In addition, in the present embodiment, the outer edge of the disc body 101 is provided as the flange 101b extending perpendicularly toward the circular cover plate 200, and the circular cover plate 200 and the flange 101b are disposed against each other in the axial direction of the circular cover plate 200, so as to further increase the flow guide area from the collecting disc to the circular cover plate.

The battery cap is installed at one axial end of a cylindrical battery in practical application, the outer edge of a circular cover plate 200 is ensured to be in sealing fit with an opening part at the end part of the cylindrical battery shell, and a disc body 101 of a current collecting disc is welded and fixed with the positive electrode or the negative electrode of a battery inner core accommodated in the battery shell. The circular cover plate 200 may be fixed to the end opening of the battery case by welding, or may be fixed to the end opening of the battery case by mechanical rolling.

When the battery works, the anode or the cathode of the battery inner core is led to the circular cover plate 200 through the current collecting disc, so that the circular cover plate 200 is used as an anode output terminal or a cathode output terminal of the battery to output electric energy outwards.

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 collector plate comprising:

a tray body (101), and

a tail body (102) with one end integrally connected with the tray body;

the tray body (101) is provided with a plane surface and a first bulge (101a) protruding out of the plane surface, the tail body (102) is provided with a plane surface and a second bulge (102a) protruding out of the plane surface, the first bulge (101a) is in abutting contact with the plane surface of the tail body (102), and the second bulge (102a) is in abutting contact with the plane surface of the tray body (101).

2. Collecting disk according to claim 1, characterized in that the first elevation (101a) and the second elevation (102a) have the same height.

3. A battery cap comprising a circular cap plate (200) and a current collecting disc (100), wherein the current collecting disc (100) is a current collecting disc according to claim 1 or 2, and the other end of the tail body (102) is fixedly connected with the circular cap plate (200).

4. A battery cap according to claim 3, characterized in that the outer edge of the tray body (101) is a flange (101b) projecting perpendicularly toward the circular cover plate (200), and the circular cover plate (200) and the flange (101b) are disposed against each other in the axial direction of the circular cover plate (200).

5. A battery cap as claimed in claim 4, characterised in that the outer profile of the tray (101) is circular.

6. A battery cap as claimed in claim 3, characterized in that the other end of the tail body (102) is welded and fixed with the circular cover plate (200).

7. A battery cap according to claim 3, characterized in that the other end of the tail body (102) is riveted with the circular cap plate (200).

8. A cylindrical battery comprising:

a cylindrical battery case having a cylindrical shape and a cylindrical shape,

a battery core accommodated in the battery case, and

the battery cap is fixed at the opening of the end part of the battery shell in a sealing way;

the battery cap is the battery cap as claimed in any one of claims 3 to 7, the tray body (101) is welded and fixed with the positive electrode or the negative electrode of the battery core, and the outer edge of the circular cover plate (200) is in sealing fit with the opening part of the end part of the battery case.