CN219457687U - Cylindrical battery - Google Patents

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a cylindrical battery. The device comprises a shell, a bare cell, an end cover and a current collecting disc; the shell is provided with an opening; the bare cell is accommodated in the shell through the opening and comprises a first tab; the end cover covers one end of the shell; the current collecting disc comprises a lug connecting part and an end cover connecting part, and the lug connecting part is connected with the end cover connecting part through a flexible connecting part; the tab connection portion is electrically connected with the first tab, and the end cover connection portion is electrically connected with the end cover. The cylindrical battery of the utility model has the beneficial effects that: the bare cell is electrically connected with the end cover through the current collecting disc with the flexible connecting part, flexible deformation capability is provided, a buffer effect can be achieved under the conditions of vibration, impact or end cover compression deformation and the like, the problem that electrical connection failure occurs due to overlarge electrical connection stress between the current collecting disc and the bare cell and between the current collecting disc and the end cover is avoided, and the reliability of electrical connection is ensured.

Description

Cylindrical battery

Technical Field

The utility model belongs to the technical field of batteries, and particularly relates to a cylindrical battery.

Background

At present, a current collecting disc of a cylindrical battery cell is often electrically connected with a wall surface of a shell in a welding mode, so that the welding difficulty is high, and if the current collecting disc is welded at the inner side of the battery cell, metal scraps are generated to influence the safety of the battery cell; if a penetration welding mode is adopted, the shell is welded from the outer wall of the shell, and the roll groove in the welding area is easy to produce stronger stretching, so that the shell is easy to leak liquid and lose efficacy in the penetration welding area.

Although there is also to connect the current collecting disc with the end cap electrically, and then connect the end cap with the shell electrically, in order to avoid the current collecting disc from welding with the shell laser, the problem that follows is, under the vibration, impact working condition of the electric core, or under the deformation of the end cap caused by the internal pressure gas production, the current collecting disc is connected with the end cap electrically, or the current collecting disc is connected with the tab electrically, the stress concentration is easy to occur, serious problems even lead to the disconnection of the electric connection position, the failure of the electric connection, etc., affect the normal use of the electric core.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present utility model is to provide a cylindrical battery, which is used for solving the problem that in the prior art, electrical connection among a current collecting disc, a bare cell and an end cover is prone to failure due to excessive stress.

To achieve the above and other related objects, the present utility model provides a cylindrical battery comprising:

a housing having an opening;

the bare cell is accommodated in the shell through the opening and comprises a first tab;

an end cap closing an end of the housing having an opening;

the current collecting disc comprises a tab connecting part and an end cover connecting part, and the tab connecting part is connected with the end cover connecting part through a flexible connecting part; the tab connection portion is electrically connected with the first tab, and the end cover connection portion is electrically connected with the end cover.

Optionally, the end cap is electrically connected with the housing.

Optionally, the position that is close to the opening of casing inboard is equipped with inwards convex bulge, the casing has open-ended one end inwards to buckle and forms the folded part, the end cover is located the bulge with between the folded part, the upper surface of end cover with the folded part contact electricity is connected, the lower surface of end cover with be provided with the rubber ring between the bulge.

Optionally, a gap is formed between the outer edge of the end cover and the side wall of the shell along the radial direction, and the outer edge of the rubber ring extends along the side opposite to the protruding part in a bending way and extends into the gap to form a seal.

Optionally, the bare cell further includes a second tab, and a terminal is mounted at an end of the housing far away from the opening, and the terminal is electrically connected with the second tab and insulated from the housing.

Optionally, the tab connection portion, the end cover connection portion, and the flexible connection portion are integrally formed; or the lug connection part and the end cover connection part are of a split molding structure, and the flexible connection part is formed by extending the lug connection part or by extending the end cover connection part.

Optionally, the end cover connecting portion hang in utmost point ear connecting portion top, one side of end cover connecting portion pass through flexible connection portion with utmost point ear connecting portion link to each other, just end cover connecting portion with utmost point ear connecting portion can pass through flexible connection portion turns over relatively.

Optionally, the end cover connection part and the flexible connection part are formed by stripping surface parts of the tab connection part.

Optionally, the edge portion of the tab connection portion extends to one side of the tab connection portion to form a bendable flexible connection portion, and the flexible connection portion and the end cover connection portion are connected into a whole.

Optionally, the end cover connecting portion is the banded structure, the one end extension of end cover connecting portion is buckled and is formed the flexible connection portion, the flexible connection portion with utmost point ear connecting portion electricity is connected.

Optionally, the end cover connecting portion is located above the tab connecting portion, and has a distance with the tab connecting portion, and the end cover connecting portion is electrically connected with the tab connecting portion through at least two flexible connecting portions.

Optionally, the end cover connecting portion is in a belt structure, and two ends of the end cover connecting portion extend and bend to form two flexible connecting portions which are symmetrically distributed.

Optionally, the end cover connecting portion is suspended above the center of the tab connecting portion, the end cover connecting portion is disc-shaped, the outer edge of the end cover connecting portion extends and bends to form an annular flexible connecting portion, and the flexible connecting portion is electrically connected with the tab connecting portion.

Optionally, the thickness of the flexible connection part is smaller than the thickness of the tab connection part and the thickness of the end cover connection part; alternatively, the flexible connection unit is formed by stacking a plurality of metal films.

As described above, the cylindrical battery of the present utility model has at least the following advantageous effects: the current collecting disc is respectively and electrically connected with the bare cell and the end cover through the lug connection part and the end cover connection part, and is in transitional electrical connection through the flexible connection part between the lug connection part and the end cover connection part, so that flexible deformability is provided, a buffer effect can be achieved under the conditions of vibration, impact or end cover compression deformation and the like, the problem that electrical connection failure occurs due to overlarge stress of electrical connection between the current collecting disc and the bare cell and between the current collecting disc and the end cover is avoided, and the reliability of electrical connection is ensured.

Drawings

Fig. 1 is a cross-sectional view of a first embodiment of a cylindrical battery of the present utility model;

FIG. 2 is an enlarged schematic view of portion A of FIG. 1;

fig. 3 is a schematic view showing the structure of the collecting tray in fig. 1;

fig. 4 is a schematic structural view of a current collecting plate according to a second embodiment of the cylindrical battery of the present utility model.

Fig. 5 is a cross-sectional view of a third embodiment of a cylindrical battery of the present utility model;

fig. 6 is a schematic view showing the structure of the collecting tray in fig. 4;

fig. 7 is a schematic structural view of a current collecting plate according to a fourth embodiment of the cylindrical battery of the present utility model;

fig. 8 is a schematic structural view of a current collecting plate of a fifth embodiment of a cylindrical battery according to the present utility model;

fig. 9 is a front view of the manifold plate of fig. 8.

Description of the part reference numerals

100-a housing; 101-a turnover part; 102-a projection; 103-opening; 200-end caps; 300-rubber ring; 400-bare cell; 401-a first tab; 402-second pole ear; 500-collecting tray; 501-tab connection; 502-end cap connection; 503-flexible connection; 600-pole.

Detailed Description

Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present utility model, which is described by the following specific examples.

It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the utility model to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the utility model, are not intended to be critical to the essential characteristics of the utility model, but are intended to fall within the spirit and scope of the utility model. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the utility model, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the utility model may be practiced.

Referring to fig. 1 and 2, in an alternative embodiment, the present application provides a cylindrical battery including a case 100, a bare cell 400, an end cap 200, and a current collecting tray 500. In addition to the above components, the above cylindrical battery may further include a post 600.

Alternatively, the case 100 has an opening 103, the bare cell 400 is accommodated inside the case 100 through the opening 103, the bare cell 400 is loaded into the case 100 from the opening 103, and one end of the case 100 having the opening 103 is capped by the cap 200.

Referring to fig. 1 to 3, in an alternative embodiment, a current collecting plate 500 includes tab connection parts 501 and end cap connection parts 502, and the tab connection parts 501 and the end cap connection parts 502 are connected by flexible connection parts 503. The bare cell 400 includes a first tab 401, a tab connection portion 501 electrically connected to the first tab 401, and an end cap connection portion 502 electrically connected to the end cap 200. The flexible connection portion 503 can provide a certain amount of flexible deformation when the positions of the end cover 200 and the bare cell 400 change, so as to avoid failure caused by overlarge stress of the electrical connection between the current collecting plate 500 and the first tab 401 and between the current collecting plate 500 and the end cover 200, and ensure the reliability of electrical connection under various conditions such as vibration, impact or deformation of the end cover 200 due to internal pressure.

Referring to fig. 2, in an alternative embodiment, an end cap 200 may be electrically connected to the housing 100.

Optionally, the bare cell 400 further includes a second tab 402, the terminal 600 is mounted on an end of the housing 100 remote from the opening 103 and electrically connected to the second tab 400, and the terminal 600 is insulated from the housing 100. Specifically, the first tab 401 may be negatively charged, the second tab 402 may be positively charged, that is, the housing 100 may be negatively charged, and the post 600 may be positively charged, so that the same end of the cylindrical battery may have the negatively charged housing 100 and the positively charged post 600, so that the same-side connection between the positive and negative electrodes may be realized, and when two or more cylindrical batteries are assembled for use, the connection assembly is simpler and more convenient.

Referring to fig. 1 and 2, a protrusion 102 is provided at a position near the opening 103 inside the case 100, and the protrusion 102 may be formed by a roller groove at a position near the opening 103 of the case 100. Wherein, the end of the shell 100 with the opening 103 is bent inwards to form the turnover part 101, the end cover 200 is positioned between the protruding part 102 and the turnover part 101, the upper surface of the end cover 200 is in contact electrical connection with the turnover part 101, a rubber ring 300 is arranged between the lower surface of the end cover 200 and the protruding part 102, and the end cover 200 and the protruding part 102 are matched to squeeze the rubber ring 300 to form a seal.

Optionally, a gap is formed between the outer edge of the end cap 200 and the side wall of the housing 100 in the radial direction, and the outer edge of the rubber ring 300 extends along the side facing away from the protruding portion 102 in a bending manner, and extends into the gap to form a seal.

Alternatively, the cross section of the rubber ring 300 may be L-shaped.

Referring to fig. 3 and 4, in some embodiments, tab connection 501, end cap connection 502, and flexible connection 503 may be an integrally formed structure.

Referring to fig. 5 to 7, in some embodiments, the tab connection portion 501 and the end cap connection portion 502 are formed as a separate piece.

Alternatively, the flexible connection part 503 may be formed by extending the tab connection part 501, and the flexible connection part 503 is electrically connected with the end cap connection part 502. Further, the flexible connection portion 503 and the tab connection portion 501 may be electrically connected by a thermal compression method or a molecular welding method.

Alternatively, the flexible connection part 503 may be formed by extending the end cap connection part 501, and the flexible connection part 503 is electrically connected to the tab connection part 501. Further, the flexible connection part 503 and the end cover connection part 502 may be electrically connected by a thermal compression method or a molecular welding method.

Referring to fig. 1 to 6, in some embodiments, the end cap connection portion 502 is suspended above the tab connection portion 501, one side of the end cap connection portion 502 is connected to the tab connection portion 501 through the flexible connection portion 503, and the end cap connection portion 502 and the tab connection portion 501 can be turned relatively through the flexible connection portion 503.

Alternatively, referring to fig. 3, the end cap connection part 502 and the flexible connection part 503 are formed by partial peeling of the surface of the tab connection part 501.

Alternatively, referring to fig. 4, the edge portion of the tab connection portion 501 extends to one side of the tab connection portion 501 to form a bendable flexible connection portion 503, and the flexible connection portion 503 is integrally connected with the end cap connection portion 502. Further, the end cap connection portion 502 may have a disk shape, the tab connection portion 501 may also have a disk shape, the area of the end cap connection portion 502 may be smaller than the area of the tab connection portion 501, and the axis lines of the end cap connection portion 502 and the tab connection portion 501 coincide.

Alternatively, referring to fig. 6, the end cap connection part 502 has a strip structure, one end of the end cap connection part 502 is extended and bent to form a flexible connection part 503, and the flexible connection part 503 is electrically connected with the tab connection part 501.

In the cylindrical battery of the above embodiment, the end cover connecting portion 502 is suspended on one side, and the end cover connecting portion 502 can be turned over relative to the tab connecting portion 501 through the flexible connecting portion 503, so that the end cover 200 and the end cover connecting portion 502 can be turned over and inclined together before welding, and the welding operation can be performed from the inner side of the end cover 200 when the end cover connecting portion 502 and the end cover 200 are welded, which is beneficial to improving the welding effect of the end cover connecting portion 502 and the end cover 200, after the welding is completed, the end cover 200 and the end cover connecting portion 502 are turned over downwards to be in a horizontal state, and one end of the casing 100 with the opening 103 is bent again to form the turnover portion 101.

Referring to fig. 7, in an alternative embodiment, an end cap connection 502 is located above the tab connection 501 with a space between the end cap connection 502 and the tab connection 501, and the end cap connection 502 is electrically connected to the tab connection 501 through at least two flexible connections 503.

Optionally, the end cover connecting portion 502 has a strip structure, and two ends of the end cover connecting portion 502 extend and are bent to form two symmetrically distributed flexible connecting portions 503.

In the cylindrical battery in the above embodiment, the contact area between the end cover connection portion 502 and the tab connection portion 501 is increased, the overcurrent capacity is stronger, and the heat dissipation performance is better.

Referring to fig. 8 and 9, in an alternative embodiment, the end cap connection part 502 is suspended above the center of the tab connection part 501, the end cap connection part 502 may have a disc shape, and the outer edge of the end cap connection part 502 extends and bends to form an annular flexible connection part 503, and the flexible connection part 503 is electrically connected with the tab connection part 501.

In the cylindrical battery in the above embodiment, the contact area between the end cover connection portion 502 and the tab connection portion 501 is further increased, the overcurrent capacity is stronger, and the heat dissipation performance is better.

Referring to fig. 3 and 4, in some embodiments, the thickness of the flexible connection 503 is less than the thickness of the tab connection 501, and the thickness of the flexible connection 503 is less than the thickness of the end cap connection 502. The thickness of the flexible connection part 503 is thinned, so that the flexible connection part 503 can provide certain flexible deformation capacity, the thinning treatment is simple to operate, the integrated forming is convenient, the stability of connection between the tab connection part 501 and the end cover connection part 502 is ensured, and the production difficulty and cost are reduced.

Referring to fig. 6 and 7, in some embodiments, the flexible connection part 503 may be formed by stacking multiple metal films, the number of metal films may be flexibly set according to requirements, and the deformability of the flexible connection part 503 is improved, so that the relative movement between the tab connection part 501 and the end cover connection part 502 is more flexible.

According to the cylindrical battery, the end cover 200 is electrically connected with the bare cell 400 through the current collecting disc 500 with the flexible connection part 503, so that the flexible connection part 503 can provide flexible deformation capability under the conditions of vibration, impact or internal pressure deformation of the end cover 200, and the like, and the problem of electrical connection failure caused by overlarge stress of the electrical connection among the current collecting disc 500, the end cover 200 and the bare cell 400 is avoided; and the manufacturing difficulty and risk are reduced, and the process assembly and the automation are facilitated.

In the description of the present specification, the descriptions of the terms "present embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (14)

1. A cylindrical battery, comprising:

a housing having an opening;

the bare cell is accommodated in the shell through the opening and comprises a first tab;

an end cap closing an end of the housing having an opening;

the current collecting disc comprises a tab connecting part and an end cover connecting part, and the tab connecting part is connected with the end cover connecting part through a flexible connecting part; the tab connection portion is electrically connected with the first tab, and the end cover connection portion is electrically connected with the end cover.

2. The cylindrical battery according to claim 1, wherein: the end cap is electrically connected with the housing.

3. The cylindrical battery according to claim 2, wherein: the inside bulge that is close to the open-ended of casing is equipped with inwards protruding, the casing has open-ended one end inwards to buckle and forms the folded part, the end cover is located the bulge with between the folded part, the upper surface of end cover with the folded part contact electricity is connected, the lower surface of end cover with be provided with the rubber ring between the bulge.

4. A cylindrical battery according to claim 3, wherein: a gap is formed between the outer edge of the end cover and the side wall of the shell along the radial direction, and the outer edge of the rubber ring is bent and extended along one side back to the protruding part and extends into the gap to form a seal.

5. The cylindrical battery according to claim 2, wherein: the bare cell further comprises a second lug, a pole is mounted at one end, far away from the opening, of the shell, and the pole is electrically connected with the second lug and insulated from the shell.

6. The cylindrical battery according to any one of claims 1 to 5, wherein: the lug connection part, the end cover connection part and the flexible connection part are of an integrated structure; or the lug connection part and the end cover connection part are of a split molding structure, and the flexible connection part is formed by extending the lug connection part or by extending the end cover connection part.

7. The cylindrical battery according to any one of claims 1 to 5, wherein: the end cover connecting portion is suspended above the lug connecting portion, one side of the end cover connecting portion is connected with the lug connecting portion through the flexible connecting portion, and the end cover connecting portion and the lug connecting portion can be turned over relatively through the flexible connecting portion.

8. The cylindrical battery according to claim 7, wherein: the end cover connecting part and the flexible connecting part are formed by stripping surface parts of the tab connecting parts.

9. The cylindrical battery according to claim 7, wherein: the edge part of the tab connection part extends to one side of the tab connection part to form a bendable flexible connection part, and the flexible connection part is connected with the end cover connection part into a whole.

10. The cylindrical battery according to claim 7, wherein: the end cover connecting portion is of a strip-shaped structure, one end of the end cover connecting portion extends and bends to form the flexible connecting portion, and the flexible connecting portion is electrically connected with the lug connecting portion.

11. The cylindrical battery according to any one of claims 1 to 5, wherein: the end cover connecting parts are positioned above the lug connecting parts, a distance is reserved between the end cover connecting parts and the lug connecting parts, and the end cover connecting parts are electrically connected with the lug connecting parts through at least two flexible connecting parts.

12. The cylindrical battery according to claim 11, wherein: the end cover connecting part is of a strip-shaped structure, and two ends of the end cover connecting part extend and bend to form two flexible connecting parts which are symmetrically distributed.

13. The cylindrical battery according to any one of claims 1 to 5, wherein: the end cover connecting portion is suspended above the center of the tab connecting portion, the end cover connecting portion is disc-shaped, the outer edge of the end cover connecting portion extends and bends to form an annular flexible connecting portion, and the flexible connecting portion is electrically connected with the tab connecting portion.

14. The cylindrical battery according to claim 1, wherein: the thickness of the flexible connecting part is smaller than the thickness of the lug connecting part and the thickness of the end cover connecting part; alternatively, the flexible connection unit is formed by stacking a plurality of metal films.