CN219393478U

CN219393478U - Battery winding core easy to permeate liquid

Info

Publication number: CN219393478U
Application number: CN202320587500.4U
Authority: CN
Inventors: 李云峰; 杨华春; 韩广欣; 马玉; 徐习岭; 闫昶秀
Original assignee: Duofudo New Material Co ltd
Current assignee: Duofudo New Material Co ltd
Priority date: 2023-03-23
Filing date: 2023-03-23
Publication date: 2023-07-21
Anticipated expiration: 2033-03-23

Abstract

A battery winding core easy to permeate liquid comprises a winding core body with a columnar full-tab structure, wherein two ends of the winding core body are respectively provided with a positive tab end face and a negative tab end face, and the positive tab end face and the negative tab end face are in a compact state; and be equipped with a plurality of infiltration district that open the infiltration hole on the negative pole ear terminal surface of rolling up the core body, and set up to the imperforate district between the adjacent infiltration district, after the negative pole ear terminal surface after the battery rolling up the core and being rubbed the flat was made a lot of infiltration holes, inside the infiltration of electrolyte can be smooth and easy to roll up the core, has shown to accelerate the infiltration speed, has promoted notes liquid production efficiency by a wide margin.

Description

Battery winding core easy to permeate liquid

Technical Field

The utility model belongs to the technical field of lithium ion battery processing, and particularly relates to a battery winding core easy to permeate liquid.

Background

With the vigorous development of electric automobiles, lithium ion power batteries have also come into a flourishing period as a core component. The power battery has three main forms of soft package, square and cylinder, and wherein the cylinder structure is mainly applied to the small-size battery below capacity 5Ah, and its capacity is little, and is numerous, and the time consuming takes time and is loaded down with trivial details when PACK. In the effort of many technicians, large cylindrical batteries with 30Ah or more have been developed in recent years, mainly thanks to the development and application of full tab structures. The full tab structure shortens the conductive path, greatly improves the power performance, has high production efficiency and low manufacturing cost, and is popular with vast automobile manufacturers.

The cylindrical battery with the full tab structure is manufactured by a flattening procedure, namely flattening and compacting aluminum foils and copper foils fluffy at two ends of a battery winding core, so that the subsequent laser welding is facilitated. However, the laser welding is also followed by a liquid injection process, the path of electrolyte penetrating into the winding core is mainly the gaps at the two ends of the winding core, the two ends of the winding core become compact after being kneaded flat, the gaps are very small, the liquid penetration is very slow when the liquid injection is carried out, even if the battery core is put into a closed environment for carrying out positive pressure-negative pressure circulation for many times, the electrolyte penetration is still slow, the production efficiency is seriously affected, and in order to meet the capacity, the quantity of liquid injection equipment and operators is increased, so that the investment and the manufacturing cost are increased intangibly.

The utility model of publication number CN218351690U discloses a button cell insulating sheet, which is mainly characterized in that an insulating part and a penetrating part are arranged on a sheet-shaped insulating sheet body, and the surface of the insulating part is larger than the area of the penetrating part, so that the button cell insulating sheet cannot be popularized and applied to a winding core with a cylindrical structure.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art and provide a battery winding core easy to permeate liquid, so that electrolyte can smoothly permeate into the winding core to accelerate the liquid permeation speed.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the battery winding core easy to permeate liquid comprises a winding core body, wherein the winding core body is of a columnar full-tab structure, two ends of the winding core body are respectively provided with a positive tab end face and a negative tab end face, and the positive tab end face and the negative tab end face are in a kneading and compacting state;

a plurality of permeation areas with permeation holes are arranged on the end face of the negative electrode lug of the winding core body, no-hole areas are arranged between adjacent permeation areas, and the permeation areas are of a fan-shaped structure; the diameter of the penetrating hole is 0.1-1.0 mm, and the depth of the penetrating hole is 1.0-2.0 mm.

The distance between the permeation holes in the same permeation area is 2-8 mm.

The diameter of the penetrating hole is 0.4-0.6 mm.

The depth of the penetration holes is 1.2-1.5 mm.

The penetration holes are formed by a hole forming plate, and the hole forming plate comprises a round steel plate and steel needles fixedly arranged on the round steel plate.

The diameter of the round steel plate is the same as that of the winding core body, and the thickness of the round steel plate is 3-10 mm.

The steel needles are distributed corresponding to the penetration holes.

The diameter of the steel needle is 0.4-0.6 mm, the length of the steel needle is 1.2-1.5 mm, and the front end of the steel needle is conical.

The beneficial effects of the utility model are as follows:

the battery winding core easy to permeate liquid comprises a winding core body with a columnar full-tab structure, wherein the two ends of the winding core body are respectively a positive tab end face and a negative tab end face, and the positive tab end face and the negative tab end face are in a kneaded compact state; and be equipped with a plurality of infiltration district that open the infiltration hole on the negative pole ear terminal surface of rolling up the core body, and set up to the imperforate district between the adjacent infiltration district, after the negative pole ear terminal surface after the battery rolling up the core and being rubbed the flat was made a lot of infiltration holes, inside the infiltration of electrolyte can be smooth and easy to roll up the core, has shown to accelerate the infiltration speed, has promoted notes liquid production efficiency by a wide margin.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

fig. 2 is a schematic structural view of the orifice plate.

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.

The utility model provides a battery winding core easy to permeate liquid, which is shown in fig. 1 and 2.

The battery winding core easy to permeate liquid comprises a winding core body, wherein the winding core body is of a columnar full-tab structure, two ends of the winding core body are respectively provided with a positive tab end face and a negative tab end face, and the positive tab end face and the negative tab end face are in a kneading and compacting state; the end face of the anode ear after being kneaded is provided with a plurality of penetrating holes, the penetrating holes are distributed in a plurality of sectors on the end face, a plurality of non-porous areas are reserved among the sectors, and the non-porous areas are used for subsequent laser welding; the diameter of the penetration hole is 0.1-1.0 mm, and the depth of the penetration hole is 1.0-2.0 mm; the distance between adjacent penetration holes in the same sector is 2-8 mm; in this embodiment, the penetration holes are made by the hole-making plate. The diameter of the permeation hole is preferably 0.4-0.6 mm, because too small a diameter of the permeation hole can delay the liquid permeation speed and too large a diameter can lead to the deformation of the pole piece in the winding core.

The thickness of the compact layer on the end face of the rolled core is generally 0.8-1.0 mm, the compact layer cannot be penetrated through when the hole depth is too small, the purpose of rapid seepage cannot be achieved, the pole piece inside the rolled core can be damaged due to the too large hole depth, and the short circuit is caused, so that the depth of a seepage hole is preferably 1.2-1.5 mm.

The penetration holes are formed at the negative electrode end only, and because the copper foil at the negative electrode end has good toughness, metal scraps are not generated during hole forming, and the aluminum foil at the positive electrode end is brittle, and the metal scraps are easily generated during hole forming, the hole forming cannot be performed.

The pore-forming plate used for pore-forming comprises a round steel plate and steel needles, the diameter of the round steel plate is the same as that of the battery core, the thickness of the round steel plate is 3-10 mm, the steel needles are welded on the same side face of the steel plate and are vertical to the steel plate, and the steel needles are distributed in a plurality of sectors and correspond to the distribution of the permeation holes of the winding core; the diameter of the steel needle is 0.4-0.6 mm, the length of the steel needle is 1.2-1.5 mm, and the front end of the steel needle is conical. When in hole forming, the circumference of the hole forming plate is aligned with the circumference of the winding core, the steel needle slowly penetrates into the end face of the negative electrode of the winding core, the penetrating speed is 0.2-2.0 mm/s, and the steel needle is completely immersed into the winding core and then pulled out.

The bus plate connected with the negative electrode end is in a concave-convex alternate shape, the convex part is contacted with the non-porous area of the end face of the winding core and is connected with the non-porous area of the end face of the winding core through laser welding, the concave part corresponds to but is not contacted with the porous area of the end face of the winding core, and the formed gap is just an electrolyte channel.

When the electrolyte is injected, the winding core is immersed in the electrolyte, and when positive pressure-negative pressure is circulated, gas in the winding core can easily escape from the permeation hole, and the electrolyte can easily permeate into the winding core from the permeation hole.

More specifically, the end face of the anode of the battery winding core 1 which is easy to permeate liquid is provided with a plurality of permeation holes 2, the permeation holes are distributed in six sectors on the end face, six non-porous areas 3 are reserved between the sectors, and the non-porous areas are used for subsequent laser welding; the diameter of the cell is 58mm, the length of the cell is 125mm, the thickness of the compact layer at the negative electrode end is 0.8mm, the diameter of the hole is 0.6mm, and the depth of the hole is 1.2mm; the distance between adjacent holes in the same sector is 4-8 mm; the penetration holes are made of a hole-making plate.

The pore-forming plate comprises a round steel plate 5 and steel needles 4, the diameter of the round steel plate is 58mm, the thickness of the round steel plate is 5mm, the steel needles are welded on the same side face of the steel plate and are perpendicular to the steel plate, and the distribution of the steel needles is in six sectors corresponding to the distribution of the penetration holes of the electric core; the diameter of the steel needle is 0.6mm, the length is 1.2mm, and the front end of the steel needle is conical. When in hole forming, the circumference of the hole forming plate is aligned with the circumference of the winding core, the steel needle slowly penetrates into the end face of the negative electrode of the winding core, the penetrating speed is 0.3mm/s, and the steel needle is completely immersed into the winding core and then pulled out.

When the electrolyte is injected, positive pressure and negative pressure circulate for 2 to 3 times, and the electrolyte fully permeates the inside of the winding core, so that the speed is high.

Where the terms "first," "second," and the like are used in this patent to define components, those skilled in the art will recognize: the use of "first" and "second" is for convenience only as well as to simplify the description of the present utility model, and the words described above are not meant to be limiting.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which are all within the scope of the claimed utility model. The scope of the utility model is defined by the appended claims and equivalents.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "front", "rear", "left", "right", "center", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the protection of the present utility model.

Claims

1. The utility model provides an easily ooze battery core, includes a core body, its characterized in that: the winding core body is of a columnar full-tab structure, two ends of the winding core body are respectively provided with a positive tab end face and a negative tab end face, and the positive tab end face and the negative tab end face are in a kneading and compacting state;

2. The battery core of claim 1, wherein the battery core is permeable to liquid: the distance between the permeation holes in the same permeation area is 2-8 mm.

3. The battery core of claim 2, wherein the battery core is permeable to liquid: the diameter of the penetrating hole is 0.4-0.6 mm.

4. The battery core of claim 1, wherein the battery core is permeable to liquid: the depth of the penetration holes is 1.2-1.5 mm.

5. The battery core of claim 1, wherein the battery core is permeable to liquid: the penetration holes are formed by a hole forming plate, and the hole forming plate comprises a round steel plate and steel needles fixedly arranged on the round steel plate.

6. The battery core of claim 5, wherein the battery core is permeable to liquid: the diameter of the round steel plate is the same as that of the winding core body, and the thickness of the round steel plate is 3-10 mm.

7. The battery core of claim 5, wherein the battery core is permeable to liquid: the steel needles are distributed corresponding to the penetration holes.

8. The battery core of claim 5, wherein the battery core is permeable to liquid: the diameter of the steel needle is 0.4-0.6 mm, the length of the steel needle is 1.2-1.5 mm, and the front end of the steel needle is conical.