CN217134632U

CN217134632U - Cylindrical battery cell

Info

Publication number: CN217134632U
Application number: CN202220807792.3U
Authority: CN
Inventors: 单雪燕
Original assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Current assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Priority date: 2022-04-08
Filing date: 2022-04-08
Publication date: 2022-08-05
Anticipated expiration: 2032-04-08

Abstract

The utility model belongs to the technical field of batteries, and discloses a cylindrical battery cell, which comprises a shell, a pole group and a liquid absorbing piece, wherein the bottom end of the shell is covered with a bottom cover; the pole group is arranged in the shell, and electrolyte is arranged in the shell between the pole group and the bottom cover; the liquid absorbing piece is provided with a pore communicated up and down, and the liquid absorbing piece is arranged on the bottom cover and is abutted against the pole group. The utility model provides a cylinder electricity core because the setting of imbibition piece, can promote the liquid level of electrolyte between utmost point group and the bottom, simultaneously, because the hole of intercommunication about having on the imbibition piece, the passageway of electrolyte can be regarded as to the hole for electrolyte can move up to utmost point group, guarantees that electrolyte homoenergetic can obtain make full use of in the life cycle in the cylinder electricity core, promotes the reliability of electric core. Therefore, the utility model provides a cylinder electricity core can guarantee that electrolyte obtains make full use of, prolongs electric core life-span, reduces the waste of electrolyte.

Description

Cylindrical battery cell

Technical Field

The utility model belongs to the technical field of the battery, especially, relate to a cylinder electricity core.

Background

The integration trend of batteries has been developed from small modules to large modules, ultra-long modules, and even no module solutions to increase the amount of power. With this trend, CTC battery integration technology allows batteries to become part of the vehicle body, and therefore large steel-shelled cylindrical cells have come into production. The scheme of the large cylindrical battery cell generally adopts positive pole riveting and negative pole pier sealing to form a battery cell main body structure.

When the battery is recycled, the electrolyte between the cell-level chips is consumed. After the electrolyte between the battery cell stages is consumed, the free electrolyte at the bottom of the battery cell is absorbed between the battery cell stages again through the siphon effect. However, in the CTC integration mode of a cylindrical cell, the positive electrode of the cell is generally upward, and the negative electrode of the cell is vertically placed downward. The battery cell free electrolyte is stored in the negative position, and when the free electrolyte is consumed and the liquid level is lower than the roller slot position, the battery cell pole group can not absorb the free electrolyte through the siphon effect, so that the service life of the battery cell is reduced and the electrolyte is wasted.

Therefore, a cylindrical battery cell is needed to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a cylinder electricity core can guarantee that electrolyte obtains make full use of in the electric core, and extension electric core life-span reduces the waste of electrolyte.

To achieve the purpose, the utility model adopts the following technical proposal:

a cylindrical cell, comprising:

the bottom end of the shell is covered with a bottom cover;

the pole group is arranged in the shell, and electrolyte is arranged between the pole group and the bottom cover in the shell;

the liquid absorbing piece is provided with a hole which is communicated up and down, and the liquid absorbing piece is arranged on the bottom cover and is abutted against the pole group.

As a preferable technical solution of the above cylindrical battery cell, a central hole is formed at a central axis of the pole group, and a top of the liquid suction member is inserted into the central hole.

As a preferable technical scheme of the above cylindrical battery cell, the liquid absorbing member includes a main body portion and a protruding portion disposed on the main body portion, the main body portion is disposed on the bottom cover, and the protruding portion is disposed in the central hole in a penetrating manner.

As a preferable technical solution of the above cylindrical battery cell, the main body portion and the protruding portion are both cylindrical structures, and the diameter of the protruding portion is smaller than that of the main body portion.

As a preferable technical solution of the above cylindrical battery cell, the protrusion is disposed at a center of a top surface of the main body portion.

As a preferable technical solution of the above cylindrical battery core, the thickness of the main body portion is 0.5mm to 3mm greater than the distance between the pole group and the bottom cover.

As a preferred technical scheme of the above cylindrical battery cell, the negative electrode of the electrode group faces the bottom cover, the bottom cover is made of aluminum, and the liquid absorbing member is made of an insulating material.

As a preferable technical solution of the above cylindrical battery core, the liquid absorbing member is made of a non-woven fabric material.

As a preferred technical scheme of the cylindrical battery core, the bottom cover is made of steel, and the liquid absorbing piece is made of a conductive material.

As a preferable technical scheme of the cylindrical battery cell, the liquid absorbing piece is made of foamed nickel.

The utility model has the advantages that:

the utility model provides a cylinder electricity core because the setting of imbibition piece, can promote the liquid level of electrolyte between utmost point group and the bottom, simultaneously, because the hole of intercommunication about having on the imbibition piece, the passageway of electrolyte can be regarded as to the hole for electrolyte can move up to utmost point group, guarantees that electrolyte homoenergetic can obtain make full use of in the life cycle in the cylinder electricity core, promotes the reliability of electric core. Therefore, the utility model provides a cylinder electricity core can guarantee that electrolyte obtains make full use of, prolongs electric core life-span, reduces the waste of electrolyte.

Drawings

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

Fig. 1 is a cross-sectional view of a cylindrical battery cell provided in an embodiment of the present invention;

fig. 2 is a front view of a liquid absorbing member provided in an embodiment of the present invention;

fig. 3 is a top view of a wicking element provided by an embodiment of the present invention.

In the figure:

1. a housing; 2. a pole group; 3. a liquid absorbing member;

11. a bottom cover; 12. a roller groove; 21. a central bore; 31. a main body portion; 32. a raised portion.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts throughout, or parts having the same or similar functions. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, unless otherwise specifically stated or limited, the terms "connected," "connected," and "mounted" are to be construed broadly and may include, for example, mounted or demounted connections, mechanical or electrical connections, direct or indirect connections through an intermediary, communication between two elements, or interaction between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, unless otherwise expressly specified or limited, the first feature "on" or "under" the second feature may include both the first and second features being in direct contact, and may also include the first and second features being in contact, not in direct contact, but with another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

As shown in fig. 1 to fig. 3, the present embodiment provides a cylindrical battery cell, which includes a casing 1, a pole group 2, and a liquid absorbing member 3, wherein a bottom cover 11 is covered on a bottom end of the casing 1; the pole group 2 is arranged in the shell 1, and electrolyte is arranged between the pole group 2 and the bottom cover 11 in the shell 1; the liquid absorbing member 3 has a hole communicated with the upper part and the lower part, and the liquid absorbing member 3 is arranged on the bottom cover 11 and is abutted against the pole group 2.

The cylinder electricity core that this embodiment provided, because imbibition piece 3's setting, can promote the liquid level of electrolyte between utmost point group 2 and bottom 11, simultaneously, because the hole of intercommunication about having on imbibition piece 3, the passageway of electrolyte can be regarded as to the hole for electrolyte can move up to utmost point group, guarantees in the cylinder electricity core that electrolyte homoenergetic enough obtains make full use of in life cycle, promotes the reliability of electric core. Therefore, the cylindrical battery cell provided by the embodiment can ensure that the electrolyte is fully utilized, the service life of the battery cell is prolonged, and the waste of the electrolyte is reduced.

Specifically, the pole group 2 has a central hole 21 at the central axis, and the top of the liquid absorbing member 3 is inserted into the central hole 21. This arrangement facilitates the flow of electrolyte to a higher position and also facilitates the positioning of the absorbent member 3.

More specifically, the liquid absorbing member 3 includes a main body portion 31 and a protrusion portion 32 provided on the main body portion 31, the main body portion 31 is provided on the bottom cover 11, and the protrusion portion 32 is inserted into the central hole 21.

Preferably, the main body portion 31 and the protrusion portion 32 are integrally formed, improving production efficiency.

Specifically, as shown in fig. 2 and 3, the main body portion 31 and the protrusion portion 32 are both cylindrical structures, and the diameter of the protrusion portion 32 is smaller than that of the main body portion 31. Of course, in other embodiments, the main body 31 and the protrusion 32 may have other shapes, and are not described herein again.

More specifically, the convex portion 32 is provided at the center of the top surface of the main body portion 31. In the present embodiment, the main body portion 31 and the protrusion portion 32 share a central axis, so that the electrolyte uniformly moves upward.

Specifically, the thickness of the main body 31 is 0.5mm to 3mm larger than the distance between the pole group 2 and the bottom cover 11. This arrangement allows the main body portion 31 to be interference fitted between the pole group 2 and the bottom cover 11.

Specifically, the negative electrode of the electrode group 2 is disposed toward the bottom cover 11, the bottom cover 11 is made of aluminum, and the liquid absorbing member 3 is made of an insulating material. Because the aluminum material is easy to corrode after the negative electrode is conductive, when the bottom cover 11 is made of the aluminum material, the liquid absorbing member 3 is made of an insulating material, so that the bottom cover 11 is prevented from being conductive, and the bottom cover 11 is protected. The absorbent member 3 is preferably a nonwoven material.

Alternatively, the negative electrode of the electrode group 2 is disposed toward the bottom cover 11, the bottom cover 11 is made of steel, and the liquid absorbing member 3 is made of conductive material. The wicking member 3 is preferably foamed nickel.

Alternatively, in some embodiments, the positive electrode of the electrode assembly 2 is disposed toward the bottom cover 11, and when the bottom cover 11 is made of steel or aluminum, the liquid absorbing member 3 may be made of insulating material or conductive material.

Specifically, the circumferential side wall of the bottom of the shell 1 is deformed inward to form a roller groove 12, the upper side of the roller groove 12 abuts against the bottom of the pole group 2, the lower side of the roller groove 12 abuts against the upper surface of the bottom cover 11, and the side wall at the bottom opening of the shell 1 is bent inward to abut against the lower surface of the bottom cover 11, so that the bottom cover 11 is fixed.

More specifically, an insulating pad is disposed between the side wall of the case 1 and the bottom cover 11.

When the cylindrical battery cell provided by this embodiment is assembled, the protruding portion 32 of the liquid absorbing member 3 is inserted into the central hole 21 of the electrode assembly 2, then the insulating pad coated around the bottom cover 11 is placed into the bottom opening of the casing 1, and then the bottom cover 11 is fixed by bending the side wall of the opening.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A cylindrical cell, comprising:

the bottom end of the shell (1) is covered with a bottom cover (11);

the pole group (2) is arranged in the shell (1), and electrolyte is arranged between the pole group (2) and the bottom cover (11) in the shell (1);

the liquid absorbing piece (3) is provided with a pore communicated up and down, and the liquid absorbing piece (3) is arranged on the bottom cover (11) and is abutted to the pole group (2).

2. The cylindrical cell of claim 1, wherein the pole group (2) has a central hole (21) at its central axis, and the top of the wicking member (3) is inserted into the central hole (21).

3. The cylindrical cell according to claim 2, wherein the liquid absorbing member (3) comprises a main body portion (31) and a protrusion portion (32) disposed on the main body portion (31), the main body portion (31) is disposed on the bottom cover (11), and the protrusion portion (32) is disposed in the central hole (21).

4. The cylindrical cell of claim 3, wherein the main body portion (31) and the protrusion portion (32) are both cylindrical structures, and the diameter of the protrusion portion (32) is smaller than the diameter of the main body portion (31).

5. The cylindrical cell of claim 3, wherein the protrusion (32) is disposed at a center of a top surface of the body portion (31).

6. The cylindrical cell of claim 3, wherein the thickness of the main body portion (31) is 0.5mm to 3mm greater than the spacing between the pole group (2) and the bottom cover (11).

7. The cylindrical cell according to any of claims 1 to 6, wherein the negative electrode of the electrode group (2) is disposed towards the bottom cover (11), the bottom cover (11) is made of aluminum, and the liquid absorbing member (3) is made of insulating material.

8. The cylindrical cell according to claim 7, wherein the liquid absorbing member (3) is made of a non-woven fabric material.

9. The cylindrical cell according to any of claims 1 to 6, wherein the bottom cover (11) is made of steel and the liquid absorbing member (3) is made of conductive material.

10. The cylindrical cell according to claim 9, wherein the wicking member (3) is foamed nickel.