CN210073928U

CN210073928U - Cylindrical battery and battery cap thereof

Info

Publication number: CN210073928U
Application number: CN201920481586.6U
Authority: CN
Inventors: 娄豫皖; 许玉林; 王爱淑; 周培荣; 张朋; 印杏莲; 李佳旭
Original assignee: Suzhou Ankao Energy Co Ltd
Current assignee: Suzhou Ankao Energy Co Ltd
Priority date: 2019-04-10
Filing date: 2019-04-10
Publication date: 2020-02-14
Anticipated expiration: 2029-04-10

Abstract

The application discloses cylindrical battery and battery block thereof, wherein the battery block includes the electrode end cover and is located the inboard current collection dish of electrode end cover, the system has the turn-ups hole of turning up on the current collection dish, the lateral surface system of electrode end cover has the recess of indent, the tank bottom of recess set up with the coaxial through-hole of arranging in turn-ups hole, inlay in the recess and establish a buckle, the hole of buckle be with the coaxial explosion-proof pressure release hole of arranging of through-hole, the axial inboard and the axial outside of buckle respectively fixedly connected with will explosion-proof pressure release hole seals up explosion-proof membrane and the blue membrane of plastics, the turn-ups in turn-ups hole stretches into the through-hole and with the pore wall of through-hole radially supports to lean on arranging. The battery cap has the advantages of simple and ingenious structure, convenience in manufacturing, low internal resistance and explosion-proof capability.

Description

Cylindrical battery and battery cap thereof

Technical Field

The application relates to the field of batteries, in particular to a cylindrical battery and a battery cap thereof.

Background

In the existing battery structure, the electrode cap has the disadvantages of complex structure, difficult manufacture and higher cost. And after the battery finished product made of the traditional electrode cap is finished, the internal resistance is higher.

Disclosure of Invention

The purpose of the application is: aiming at the problems, the battery cap with simple and ingenious structure, convenient manufacture, low internal resistance and explosion-proof capability is provided, and a cylindrical battery with the battery cap is also provided.

The technical scheme of the application is as follows:

the utility model provides a battery cap, includes the electrode end cover and is located the inboard current collector disc of electrode end cover, the system has the turn-ups hole of turning up on the current collector disc, the lateral surface system of electrode end cover has the recess of indent, the tank bottom of recess set up with the through-hole of turn-ups hole coaxial arrangement, inlay in the recess and establish a buckle, the hole of buckle be with the explosion-proof pressure release hole that the through-hole is coaxial to be arranged, the axial inboard and the axial outside of buckle respectively fixedly connected with explosion-proof pressure release hole seal closed's rupture membrane and plastics blue membrane, the turn-ups of turn-ups hole stretch into the through-hole and with the pore wall of through-hole radially supports to lean on and arranges.

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

the outer edge of the retaining ring is arranged against the side wall of the groove.

The axial outer end face of the retaining ring, the axial outer end face of the plastic blue film and the axial outer end face of the electrode end cover are arranged in a flush mode.

The flanging of the flanging hole extends out of the through hole and is welded and fixed with the retaining ring, so that the electrode end cover is axially clamped between the current collecting disc and the retaining ring

The outer contours of the current collecting disc, the electrode end cover and the retaining ring are circular, the flanging hole is formed in the center of the current collecting disc, the through hole is formed in the center of the electrode end cover, and the explosion-proof pressure relief hole is formed in the center of the retaining ring.

The center of the collecting disc is punched with a first reinforcing convex plate protruding outwards, and the flanging hole is formed in the middle of the first reinforcing convex plate.

And a second reinforcing convex plate protruding inwards is punched in the center of the electrode end cover, so that the groove is formed on the outer side of the second reinforcing convex plate, and the outer side surface of the first reinforcing convex plate is abutted against the inner side surface of the second reinforcing convex plate.

And the outer side surface of the first reinforcing convex plate is welded and fixed with the inner side surface of the second reinforcing convex plate.

The cylindrical battery proposed in the present application includes:

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

an inner core accommodated in the battery case, an

The positive electrode cap and the negative electrode cap are respectively arranged at two axial ends of the battery shell;

the battery cover is characterized in that the anode cover cap or the cathode cover cap is the battery cover cap, and the current collecting disc is welded and fixed with the anode end face or the cathode end face of the inner core.

The positive electrode cap and the negative electrode cap are both the electric battery cap, the current collecting disc of the positive electrode cap is fixedly welded with the positive electrode end face of the inner core, and the current collecting disc of the negative electrode cap is fixedly welded with the negative electrode end face of the inner core.

The application has the advantages that:

1. this application sets up through-hole and flanging hole respectively on electrode end cover and current collection dish, through the cooperation of inserting to through-hole and flanging hole, has not only increaseed the area of overflowing of current collection dish with the electrode end cover, and then has reduced the internal resistance of battery, has made things convenient for current collection dish to be connected with the accurate counterpoint of electrode end cover moreover. In addition, this application utilizes the pressure release air permeability in aforementioned through-hole and flanging hole, arranges the buckle of taking the pressure release hole in the through-hole outside, seals on the buckle and sets up the rupture membrane for this battery block has still possessed explosion-proof function, and is very ingenious.

2. The battery of this kind of battery block of configuration this application need not to set up and annotates the liquid hole, before the buckle installation, can pour into electrolyte into from the through-hole of electrode end cover and the turn-ups hole of current collection dish, and is very convenient.

3. The center department of current collecting disc has punched outwards convex first enhancement flange, and the center department of electrode end cover has punched inwards convex second enhancement flange, and the lateral surface of first enhancement flange and the medial surface of second enhancement flange lean on to arrange and welded fastening, have not only promoted the structural strength of current collecting disc and electrode end cover self, have further increased current collecting disc and electrode end cover area of overflowing moreover.

4. If the flanging of the flanging hole is axially lengthened, the flanging can extend outwards to form the through hole to be welded and fixed with the retaining ring, so that the electrode end cover can be axially clamped between the current collecting disc and the retaining ring, the current collecting disc and the electrode end cover do not need to be welded, the retaining ring and the electrode end cover do not need to be welded, a welding procedure is reduced, the assembling efficiency is high, and the cost is saved.

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 perspective view of a battery cap according to an embodiment of the present disclosure;

FIG. 2 is a schematic axial sectional view of a battery cap according to an embodiment of the present disclosure;

FIG. 3 is an exploded view of a battery cap in an embodiment of the present application;

wherein: 1-electrode end cover, 2-current collecting disc, 3-retaining ring, 4-explosion-proof film, 5-plastic blue film, 101-groove, 102-through hole, 103-second reinforcing convex plate, 201-flanging hole, 201 a-flanging, 202-first reinforcing convex plate and 301-explosion-proof pressure relief hole.

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 to 3 show a preferred embodiment of a cell cap of the present application, which also comprises, like a conventional cell cap, an electrode end cap 1 and a current collecting disc 2 inside the electrode end cap. In the present application, the terms "inside" and "outside", unless otherwise specified, refer to the side of the battery cap facing the center of the battery as "inside" when the battery cap is attached to the battery, and vice versa as "outside".

The key improvement of the embodiment is that the collecting plate 2 is provided with an outward turned flanging hole 201, and the outward turned flanging means that the flanging of the flanging hole is turned outwards. The outer side surface of the electrode end cover 1 is provided with an inwards concave groove 101, and the bottom of the groove 101 is provided with a through hole 102 which is coaxial with the flanging hole 201. A retaining ring 3 is embedded in the groove 101, and an inner hole (the retaining ring is of an annular structure and therefore necessarily has an inner hole) of the retaining ring 3 is an explosion-proof pressure relief hole 301 which is coaxially arranged with the through hole 102. An explosion-proof membrane 4 is welded and fixed on the axial inner side of the retaining ring 3, a plastic blue membrane 5 is pasted on the axial outer side of the retaining ring 3, and the explosion-proof pressure relief hole 301 is sealed and sealed by the explosion-proof membrane 4 and the plastic blue membrane 5. The flange 201a of the flange hole 201 extends into the through hole 102, and the flange 201a is radially disposed against the hole wall of the through hole 102.

It can be easily understood that the flanging of the flanging hole 201 on the current collecting disc 2 is radially abutted against the hole wall of the through hole 102 on the electrode end cover 1, so that the assembly and positioning of the current collecting disc 2 and the electrode end cover 1 are facilitated, the flow area of the current collecting disc 2 and the electrode end cover 1 is increased, and the reduction of the internal resistance of the battery is facilitated.

In order to improve the structural integrity of the battery cap, the current collecting plate 2 and the retaining ring 3 are welded and fixed with the electrode end cover 1.

In order to prevent contaminants or moisture in the environment from entering the battery through the gap between the retaining ring 3 and the side wall of the groove 101, the present embodiment arranges the outer edge of the retaining ring 3 in close contact with the side wall of the groove 101 without a gap therebetween.

The axial outer end face of the retaining ring 3, the axial outer end face of the plastic blue film 5 and the axial outer end face of the electrode end cover 1 are arranged in a flush mode, and therefore the flatness of the end face of the battery cap is guaranteed.

The battery cap is used for a cylindrical battery, so the outer contours of the current collecting plate 2, the electrode end cover 1 and the retaining ring 3 are all circular. The flanging hole 201 is arranged at the central part of the current collecting disc 2, the through hole 102 is arranged at the central part of the electrode end cover 1, and the explosion-proof pressure relief hole 301 is arranged at the central part of the retaining ring 3.

In order to improve the structural strength of the current collecting disc 2 and the electrode end cover 1 and further increase the flow area of the current collecting disc 2 and the electrode end cover 1, in this embodiment, a first reinforcing convex plate 202 protruding outwards is punched at the center of the current collecting disc 2, and the flanging hole 201 is specifically arranged in the middle of the first reinforcing convex plate 202. A second reinforcing protrusion 103 protruding inward is punched at the center of the electrode cap 1, so that the above-mentioned groove 101 is formed on the outer side of the second reinforcing protrusion 103. The outer side surface of the first reinforcing convex plate 202 is abutted against the inner side surface of the second reinforcing convex plate 103.

The welding position between the current collecting disc 2 and the electrode end cap 1 is specifically the abutting position between the first reinforcing convex plate 202 and the second reinforcing convex plate 103, that is, the outer side surface of the first reinforcing convex plate 202 and the inner side surface of the second reinforcing convex plate 103 are welded and fixed.

Of course, the flange 201a of the flange hole 201 may be axially lengthened, so that the flange 102a may extend outward from the through hole 102, and the extending portion of the flange 102a is welded and fixed to the retaining ring 3, so that the electrode end cover 1 may be axially clamped between the current collecting plate 2 and the retaining ring 3. Therefore, the current collecting disc 2 and the electrode end cover 1 do not need to be welded, the retaining ring 3 and the electrode end cover 1 do not need to be welded, and a welding process is reduced.

The battery cap of the present embodiment may be used as a positive electrode cap of a battery or as a negative electrode cap of a battery, and is generally disposed in a cylindrical lithium ion battery. Such as: a typical cylindrical battery includes a cylindrical battery case, an inner core accommodated in the battery case, and a positive electrode cap and a negative electrode cap respectively provided at both ends of the battery case in an axial direction. The battery shell can be a cylinder structure with two open ends or a cylinder structure with one open end and the other closed end and with a bottom. If the positive electrode cap adopts the battery cap structure of the embodiment, the current collecting plate 2 and the positive electrode end surface of the inner core need to be welded and fixed. If the negative electrode cap adopts the battery cap structure of the embodiment, the current collecting plate 2 and the negative electrode end surface of the inner core need to be welded and fixed. When the internal pressure of the battery case is rapidly increased due to the failure of the battery, the high-pressure gas can burst the explosion-proof membrane 4 and the plastic blue membrane 5 to discharge the internal pressure, so that the explosion of the battery is prevented. The plastic blue film 5 is used for protecting the inner explosion-proof film.

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 battery cap comprises an electrode end cover (1) and a current collecting disc (2) positioned on the inner side of the electrode end cover, it is characterized in that the collecting plate (2) is provided with an eversion flanging hole (201), the outer side surface of the electrode end cover (1) is provided with an inwards concave groove (101), the bottom of the groove (101) is provided with a through hole (102) which is coaxial with the flanging hole (201), a retaining ring (3) is embedded in the groove (101), an inner hole of the retaining ring (3) is an explosion-proof pressure relief hole (301) which is coaxial with the through hole (102), the axial inner side and the axial outer side of the retaining ring (3) are respectively and fixedly connected with an explosion-proof film (4) and a plastic blue film (5) which seal and seal the explosion-proof pressure relief hole (301), and a flanging (201a) of the flanging hole (201) extends into the through hole (102) and is radially abutted against the hole wall of the through hole (102).

2. The battery cap according to claim 1, characterized in that the outer rim of the retaining ring (3) is arranged against the side wall of the groove (101).

3. The battery cap according to claim 1, characterized in that the axially outer end face of the snap ring (3), the axially outer end face of the plastic blue film (5) and the axially outer end face of the electrode end cap (1) are arranged flush.

4. The battery cap according to claim 1, wherein a flange (201a) of the flange hole (201) extends outward from the through hole (102) and is welded and fixed to the retaining ring (3), so that the electrode cap (1) is axially sandwiched between the current collecting plate (2) and the retaining ring (3).

5. The battery cap according to claim 1, wherein the current collecting disc (2), the electrode end cap (1) and the retaining ring (3) are all circular in outer contour, the flanging hole (201) is formed in the center of the current collecting disc (2), the through hole (102) is formed in the center of the electrode end cap (1), and the explosion-proof pressure relief hole (301) is formed in the center of the retaining ring (3).

6. The battery cap according to claim 5, wherein a first reinforcing convex plate (202) protruding outwards is punched in the center of the current collecting disc (2), and the flanging hole (201) is formed in the middle of the first reinforcing convex plate (202).

7. A battery cap according to claim 6, characterized in that the center of the electrode end cap (1) is punched with a second reinforcing flange (103) protruding inwards, so that the groove (101) is formed on the outer side of the second reinforcing flange (103), and the outer side face of the first reinforcing flange (202) is arranged against the inner side face of the second reinforcing flange (103).

8. The battery cap according to claim 7, wherein the outer side surface of the first reinforcing flange (202) is welded and fixed to the inner side surface of the second reinforcing flange (103).

9. A cylindrical battery comprising:

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

an inner core accommodated in the battery case, an

the battery cover cap is characterized in that the positive electrode cover cap or the negative electrode cover cap is the battery cover cap as claimed in any one of claims 1 to 8, and the current collecting disc (2) is fixedly welded with the positive electrode end face or the negative electrode end face of the inner core.

10. The cylindrical battery according to claim 9, wherein the positive electrode cap and the negative electrode cap are the battery cap according to any one of claims 1 to 8, the current collecting plate (2) of the positive electrode cap is welded and fixed to the positive electrode end face of the inner core, and the current collecting plate (2) of the negative electrode cap is welded and fixed to the negative electrode end face of the inner core.