CN217562721U - Square lithium ion battery cell supporting structure - Google Patents

Abstract

The utility model provides a square lithium ion battery electricity core bearing structure, include: square shell, coiling electricity core and support column, coiling electricity core embedding is installed inboard at the square shell, the square shell inner wall includes four right angle inner walls of arranging along the circumference array of coiling electricity core, and the length direction of right angle inner wall is parallel with the axis direction of coiling electricity core, and every right angle inner wall department equal fixed mounting has a support column, and the lateral wall of support column includes two right angle faces and a holding surface, and two right angle faces paste tightly with two walls of right angle inner wall respectively, and the holding surface pastes tightly with coiling electricity core surface. The utility model has the advantages of simple structure, can effectively improve the atress degree of consistency of winding electric core among the square battery to avoid rolling up the inside of core unusual problems such as fold and utmost point group spiral to appear.

Description

Square lithium ion battery cell supporting structure

Technical Field

The utility model relates to the technical field of batteries, especially, relate to a square lithium ion battery electricity core bearing structure.

Background

At present, the market application of the square lithium ion battery is wide, the winding core of the square battery is generally obtained by a winding process, and the wound winding core is directly assembled in a square shell.

However, in the winding process of the winding core, according to the difference of the winding needle structure, an elliptic cylindrical winding core or a cylindrical winding core with a long circular cross section generally exists, the winding cores are all without exception, circular arc-shaped edges exist, the circular arc-shaped edges cannot be tightly attached to the inner wall of the square shell after being embedded into the square shell, the corresponding parts lack effective support, electrode materials of the lithium ion battery can expand in the charging and discharging process, the problem that the stress is uneven easily occurs at other places when the circular arc-shaped edges lack support are compared, abnormal problems such as folds, pole group spirals and the like can be caused in the winding core finally, and the performance of the battery is seriously affected.

In view of this, how to improve the supporting force uniformity of the winding core in the square-shell battery cell becomes a technical problem to be solved urgently in the field.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a can improve square lithium ion battery electricity core bearing structure of inside atress.

The technical scheme of the utility model is realized like this: the utility model provides a square lithium ion battery electricity core bearing structure, include: square shell, coiling electricity core and support column, coiling electricity core embedding is installed inboard at the square shell, the square shell inner wall includes four right angle inner walls of arranging along the circumference array of coiling electricity core, and the length direction of right angle inner wall is parallel with the axis direction of coiling electricity core, and every right angle inner wall department equal fixed mounting has a support column, and the lateral wall of support column includes two right angle faces and a holding surface, and two right angle faces paste tightly with two walls of right angle inner wall respectively, and the holding surface pastes tightly with coiling electricity core surface.

On the basis of the above technical scheme, preferably, the supporting surface is an outward convex arc surface, and an axis of the arc surface is parallel to an axis direction of the winding battery core.

On the basis of the technical scheme, preferably, the radian of the convex arc surface is not more than 90 degrees.

On the basis of the above technical scheme, preferably, the supporting surface is an inward concave arc surface, and the axis of the arc surface is parallel to the axis direction of the winding battery cell.

On the basis of the technical scheme, preferably, the radian of the concave arc surface is not more than 90 degrees.

On the basis of the above technical scheme, preferably, a through groove is formed in the end surface of the support column, and an opening at one end of the through groove is opposite to the winding battery cell.

Still further preferably, each surface of the support column is provided with at least one small hole, and the small holes on different surfaces are communicated with each other.

On the basis of the above technical scheme, preferably, the support column is made of polypropylene.

The utility model discloses following beneficial effect has for prior art:

(1) The utility model provides a square lithium ion battery cell supporting structure, which is characterized in that supporting columns are arranged at four corners inside a square shell, and the arc position of a winding cell is supported by the supporting columns, so that the problem of later deformation of a winding core caused by insufficient supporting force at the right corners of the cell inside the square lithium ion battery is avoided;

(2) The utility model discloses still carried out the configuration optimization to bearing structure, designed into arc to its holding surface, the arc surface of evagination can agree with the external shape of electric core better, nevertheless support the contact surface relatively less, also appear local small range atress inhomogeneous easily, the arc surface of indent then can overcome the inhomogeneous problem of contact, but the structure of indent arc surface evagination relatively, the material is more, and the degree of agreeing with the degree of contact requirement is high with the electric core;

(3) Further, the utility model discloses a reduce the weight of support column as far as possible and account for the ratio, adopted the surface to have a support column structure of a plurality of apertures, the aperture that communicates each other on the one hand allows the electrolyte circulation, and on the other hand then can reduce the bulk density of support column to improve the energy density of battery.

Drawings

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

Fig. 1 is an isometric view of a square lithium ion battery cell support structure of the present invention;

FIG. 2 is an exploded view of FIG. 1;

fig. 3 is a top view of the cell support structure of the square lithium ion battery of the present invention;

fig. 4 is an axonometric view of a support column in the square lithium ion battery cell support structure of the present invention;

fig. 5 is a top view of a support column in the square lithium ion battery cell support structure of the present invention;

fig. 6 is an axonometric view of another embodiment of the support column in the square lithium ion battery cell support structure of the present invention.

In the figure: 1-square shell, 2-winding cell, 3-support column, 11-right-angle inner wall, 31-right-angle surface, 32-support surface, 33-through groove and 34-small hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

As shown in fig. 1, combine fig. 2-6, the utility model discloses a square lithium ion battery electricity core bearing structure, it includes square shell 1, coiling electricity core 2 and support column 3, and square shell 1 has cube form inner chamber, and coiling electricity core 2 is the columnar structure, it is inboard at square shell 1 to coil the embedding of electricity core 2, four right angle inner walls 11 that the circumference array of coiling electricity core 2 was arranged are included to square shell 1 inner wall, and the length direction of right angle inner wall 11 is parallel with the axis direction of coiling electricity core 2, and the equal fixed mounting in 11 departments of every right angle inner wall has a support column 3, and the lateral wall of support column 3 includes two right angle faces 31 and a holding surface 32, and two right angle faces 31 paste tightly with the two walls of right angle inner wall 11 respectively, and holding surface 32 pastes tightly with coiling electricity core 2 surface.

In the above embodiment, the supporting column 3 is used as a filling structure, the gap between the square shell 1 and the winding battery core 2 is filled, because the winding battery core 2 is formed by winding the pole piece around a winding needle, the surface of the winding battery core at least comprises four arc surfaces at intervals or continuously connected, in order to maximize the filling degree of the battery core in the square shell as much as possible, the corresponding arc surface can be necessarily over against the right-angled edge of the square shell 1, the right-angled edge is correspondingly arranged on the inner side of the square shell 1 to be the right-angled inner wall 11, the arc surface of the battery core can not be completely attached to the right-angled inner wall 11, and therefore the supporting column 3 is arranged at the right-angled inner wall 11, so that the gap at the position can be filled, and meanwhile, the supporting surface 32 is used for supporting the arc surface of the battery core, so that the supporting stress at the position is improved, the supporting stress at the position and the stress at other positions of the battery core can be kept balanced as much as possible, and abnormal problems such as wrinkles and spiral poles caused by unbalanced stress in the interior of the winding core are avoided.

In a specific embodiment, the supporting surface 32 is a convex arc surface, and an axis of the arc surface is parallel to an axis direction of the winding electric core 2.

In the above embodiment, the arc surface of evagination can be on can carrying out the basis that supports to coiling electricity core 2, reduce the material quantity of support column 3, simultaneously because the arc surface of evagination has different contact surface along the radial direction of symmetry axis, consequently, can improve the adaptability of the support column 3 that corresponds to not unidimensional coiling electricity core 2, however, the arc surface of evagination can't contact with the arc surface of coiling electricity core 2 completely, consequently, can't the pressure of the 2 surperficial different positions departments of coiling electricity core completely balanced.

In a specific embodiment, the two right-angle surfaces 11 may be the same in size or different in size, and at this time, the contact position between the support surface 32 and the winding electric core 2 may change along with the difference in length between the two right-angle surfaces 11.

In a specific embodiment, the supporting surface 32 is a concave arc surface, and an axis of the arc surface is parallel to an axis direction of the winding electric core 2.

In the above embodiment, the contact area of the arc surface of the concave arc surface at the surface care-over position with the winding battery cell 2 can be increased, but it is corresponding, in order to achieve better contact effect, the distance between the concave arc surface and the winding battery cell 2 surface must be able to satisfy the requirement of the mounting position of the winding battery cell 2 in the square shell 1, at this moment, if the position of the concave arc surface is not appropriate, or the concave arc surface cannot directly contact with the winding battery cell 2, the support effect cannot be realized, or the pressure in contact with the winding battery cell is greater than the pressure at other positions, thereby the problem of unbalanced contact pressure can be caused, and the winding battery cell is difficult to mount.

In a specific embodiment, a through groove 33 is formed in an end surface of the support pillar 3, and an opening at one end of the through groove 33 faces the winding electric core 2.

In the above embodiment, the through grooves 33 can reduce the amount of material used for the support posts 3.

In a specific embodiment, each surface of the support column 3 is provided with at least one small hole 34, and the small holes 34 on different surfaces are communicated with each other.

In the above embodiment, a plurality of apertures 34 that communicate each other can reduce the bulk density of support column 3 by a wide margin to be favorable to improving the energy density of battery, secondly the aperture can let electrolyte infiltration whereabouts more easily, and aperture 34 can also mutually support with logical groove 33, lets the electrolyte that the later stage was irritated flow to the battery bottom more easily, thereby is absorbed by the electric core of convoluteing.

In a specific embodiment, the supporting column 3 is made of polypropylene.

In the above embodiment, the polypropylene support pillar can maintain good structural strength, has relatively low density, and is more environment-friendly, and as other optional embodiments, the support pillar 3 may also be made of other known polymer materials that can be used for batteries.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A square lithium ion battery cell support structure, comprising: square shell (1), coiling electric core (2) and support column (3), it is inboard in square shell (1) to coil electric core (2) embedding installation, square shell (1) inner wall includes four right angle inner walls (11) of arranging along the circumference array of coiling electric core (2), and the length direction of right angle inner wall (11) is parallel with the axis direction of coiling electric core (2), and equal fixed mounting is located in every right angle inner wall (11) has a support column (3), and the lateral wall of support column (3) includes two right angle faces (31) and a holding surface (32), and two right angle faces (31) are pasted tightly with the two walls of right angle inner wall (11) respectively, and holding surface (32) are pasted tightly with coiling electric core (2) surface.

2. The cell support structure of a square lithium ion battery of claim 1, characterized in that the support surface (32) is a convex arc surface, and the axis of the arc surface is parallel to the axial direction of the winding cell (2).

3. The square lithium ion battery cell support structure of claim 2, wherein the arc of the convex arc surface is no more than 90 °.

4. The cell support structure of a square lithium ion battery of claim 1, characterized in that the support surface (32) is an inwardly concave circular arc surface, and the axis of the circular arc surface is parallel to the axial direction of the winding cell (2).

5. The square lithium ion battery cell support structure of claim 4, wherein the arc of the concave arc surface is no more than 90 °.

6. The square lithium ion battery cell support structure of claim 1, wherein a through groove (33) is formed in the end surface of the support column (3), and one end of the through groove (33) is open and faces the winding cell (2).

7. The square lithium ion battery cell support structure of claim 1, wherein each surface of the support column (3) is provided with at least one small hole (34), and the small holes (34) on different surfaces are communicated with each other.

8. The square lithium ion battery cell support structure of claim 1, wherein the support columns (3) are made of polypropylene.

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