CN214411272U

CN214411272U - Electricity core hot press unit

Info

Publication number: CN214411272U
Application number: CN202120594216.0U
Authority: CN
Inventors: 马毅; 丁亚男; 杨树涛; 苏夏
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2021-03-23
Filing date: 2021-03-23
Publication date: 2021-10-15
Anticipated expiration: 2031-03-23

Abstract

The utility model provides an electric core hot-pressing device, which comprises a vacuum box and a baffle plate, wherein the baffle plate is arranged in the vacuum box and divides the vacuum box into an open cavity and an electric core accommodating cavity which are arranged up and down, the open cavity is communicated with the outside, and the baffle plate is configured to be drawn out from the vacuum box; the film is laid in the open cavity, and the electric core accommodating cavity can form a sealed cavity by laying the film; and the vacuum connecting piece is connected with the battery cell accommodating cavity and is configured to be connected with an external vacuumizing device so as to vacuumize the battery cell accommodating cavity. Electric core hot press unit, the district of thinning that utilizes vacuum hot pressing mode to make electric core also can obtain abundant hot pressing, does benefit to the hot pressing effect that improves the pole piece and thins the district.

Description

Electricity core hot press unit

Technical Field

The utility model relates to a battery electricity core processing technology field, in particular to electricity core hot press unit.

Background

Currently, lithium batteries are a field of rapid development in the new energy industry and have been applied to people's daily life. Especially in the digital products and automobile industries, the demand for lithium batteries is very outstanding, so that the production of lithium batteries has already formed a certain scale at home and abroad and is increasingly applied to automobiles and other energy storage fields.

The hot pressing of the battery core (post-lamination hot pressing) is an important process in the production of lithium batteries, and in popular terms, the laminated battery core is placed in a hot press, parameters of the hot press are set, and a positive plate, a negative plate and an isolating membrane in the battery core are pressed together, so that the positive plate, the negative plate and a diaphragm are tightly attached, and the hot-pressed battery core is used in the next process.

In the production process of the lithium ion battery, due to the characteristics of the slurry, the coated pole piece has a thinning area which cannot be avoided. The thickness of the thinning area of each single pole piece is 8-10 μm thinner than that of the normal pole piece, and if the thinning areas of the single pole pieces are superposed, the thickness of the thinning area of one cell can be reduced by 0.65-0.81mm compared with that of the normal cell if the thinning areas of the single pole pieces are superposed. Also, as the number of layers of the laminate increases, the thickness difference becomes more pronounced. Because the cell has the skived area, the skived area of the cell is often not hot-pressed during the hot-pressing process.

The insufficient hot pressing of the battery core can cause a plurality of problems, mainly the contact between the thinning area and the isolating film is insufficient, in the ultrasonic welding process of the lug, metal dust easily enters the battery core through the gap between the thinning area and the isolating film which are not tightly attached, and the short circuit of the battery core is easily caused; moreover, the edge of the battery cell can be softened if the hot pressing is insufficient, so that the later assembly of the battery cell is not facilitated.

In the existing hot pressing process, the problem that a thinning area is not contacted sufficiently with an isolating membrane is solved mainly by increasing hot pressing time, but after the time is increased, a cell main body is easy to be over-pressed, so that a diaphragm is shrunk, and a defective product is generated. Some hot pressboards are made into concave-convex shapes to carry out hot pressing on the battery core, the problem of insufficient hot pressing of the thinning area can be solved by the mode, but the types of batteries are different, the distribution situation of the thinning area is also different, the hot pressboards need to be replaced according to different sizes of the battery core, and the model replacement is complex.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a cell hot-pressing apparatus to improve the hot-pressing effect of the thinning region of the electrode plate in the cell.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

a cell hot press apparatus, comprising:

a vacuum box;

the separator is arranged in the vacuum box and divides the vacuum box into an open cavity and a battery cell accommodating cavity which are arranged up and down, the open cavity is communicated with the outside, and the separator is configured to be drawn out from the vacuum box;

the film is laid in the open cavity, and the electric core accommodating cavity can form a sealed cavity by laying the film;

and the vacuum connecting piece is connected with the battery cell accommodating cavity and is configured to be connected with an external vacuumizing device so as to vacuumize the battery cell accommodating cavity.

Further, the electric core hot-pressing device further comprises a heating mechanism for heating the open cavity.

Furthermore, the heating mechanism comprises an electric heating unit and a temperature detection unit which are arranged in the open cavity, and an electric control device which is respectively connected with the electric heating unit and the temperature detection unit and is used for controlling the electric heating unit to open and close.

Furthermore, the side wall in the vacuum box is provided with a bulge, a through hole is formed in the side wall on one side of the vacuum box corresponding to the bulge, and the partition plate is supported on the bulge and can be drawn out from the through hole.

Furthermore, the inner wall of the through hole is provided with a sealing strip which is abutted to the partition plate.

Furthermore, the baffle is made of non-metal materials.

Furthermore, the film is made of PE material.

Further, the height of the open cavity is more than or equal to 300 mm.

Furthermore, the vacuum connector comprises a vacuum tube and a valve connected in series with the vacuum tube.

Furthermore, a water outlet is formed in the bottom of one side of the battery cell accommodating cavity.

Compared with the prior art, the utility model discloses following advantage has:

electric core hot press unit, make electric core hold the chamber and form sealed cavity through laying the film to utilize the vacuum to carry out hot pressing to electric core, take the baffle out after the evacuation, make the sealed laminating of film in the bottom of vacuum chamber, sealed electric core simultaneously can make the whole of pole piece, especially cut thin the district and receive same pressure, can improve the degree that thin district and film of pole piece closely laminated, do benefit to the hot pressing effect that the district was cut to the pole piece in improving electric core.

In addition, the heating mechanism can be used for heating liquid added above the battery cell, namely in the open cavity, the heated liquid can provide a heat source for the hot pressing of the battery cell, the hot pressing problem of the pole piece thinning area can be improved, and the hot pressing effect of the battery cell can be improved.

Drawings

The accompanying drawings, which form a part of the present disclosure, are provided to provide a further understanding of the present disclosure, and the exemplary embodiments and descriptions thereof are provided to explain the present disclosure, wherein the related terms in the front, back, up, down, and the like are only used to represent relative positional relationships, and do not constitute an undue limitation of the present disclosure. In the drawings:

fig. 1 is a schematic view of an overall structure of a cell hot-pressing apparatus according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of a cell hot-pressing device according to an embodiment of the present invention.

Description of reference numerals:

1. a vacuum box; 101. an open cavity; 102. a battery cell accommodating cavity; 103. a protrusion; 104. a through hole; 2. a partition plate; 3. a film; 4. a vacuum connection; 401. a vacuum tube; 402. a valve; 5. a heating mechanism; 501. an electrical heating unit; 502. a temperature detection unit; 6. a sealing strip; 7. a water outlet;

D. open cavity height.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms first, second, etc. in this specification are not necessarily all referring to the same item, but are to be construed as indicating or implying any particular importance.

In addition, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless otherwise specifically limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood in combination with the specific situation.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The embodiment relates to a cell hot-pressing device, which comprises a vacuum box 1 and a partition board 2 arranged in the vacuum box 1, wherein the partition board 2 divides the interior of the vacuum box 1 into an open cavity 101 and a cell accommodating cavity 102 which are arranged up and down; the open cavity 101 is communicated with the outside, the partition board 2 is configured to be drawn out from the vacuum box 1, on the basis, the film 3 is laid in the open cavity 101, and the cell accommodating cavity 102 can form a sealed cavity along with the laying of the diaphragm; in addition, the vacuum box 1 is provided with a vacuum connector 4 connected to the cell accommodating cavity 102, and the vacuum connector 4 is configured to be connectable to an external vacuum-pumping device, so as to realize vacuum-pumping of the cell accommodating cavity 102.

The electric core hot press unit of this embodiment arranges electric core in electric core holds chamber 102 to hold the air in chamber 102 through extraction electric core and make electric core be in vacuum state, take out baffle 2 in the vacuum chamber 1, make film 3 laminate rapidly on the surface of electric core under the condition of negative pressure, film 3 can cover electric core sealedly, thereby improve the pole piece and cut the uneven condition of district atress.

Based on the above overall design, an exemplary structure of the cell hot-pressing apparatus of this embodiment is as shown in fig. 1 and fig. 2, and in this embodiment, as a preferred implementation manner, the cell hot-pressing device further includes a heating mechanism 5 that heats the inside of the open cavity 101, specifically, the heating mechanism 5 includes an electric heating unit 501 and a temperature detection unit 502 that are disposed in the open cavity 101, and an electric control device that is connected to the electric heating unit 501 and the temperature detection unit 502 respectively and controls the electric heating unit 501 to open and close.

It should be noted that, liquid needs to be added into the open cavity 101 for heating, so that the electric core is pressurized in the process of hot pressing the electric core, and the thinning area of the pole piece can be more closely attached to the film 3, which is beneficial to improving the hot pressing effect of the thinning area of the pole piece in the electric core; further, the film 3 may be a PE film, nylon, or the like, and is not particularly limited.

In addition, since the liquid is added above the film 3, the liquid added in the open cavity 101 can directly contact with the film 3, and the film 3 is protected, so that the liquid in the embodiment is selected from deionized water, and the deionized water has the advantages of high heating speed, strong fluidity, difficulty in damaging the film 3 and the like, and can play a role in sealing and providing a heat source. Of course, deionized water may be replaced with purified water or other liquids.

In addition, set up the height D of open chamber 101 to be more than or equal to 300mm, in concrete implementation, for guaranteeing electric core hot pressing effect, the height that deionized water added is higher than 300mm and is excellent, and deionized water after the heating carries on film 3 to carry out the hot pressing to electric core, can improve the hot pressing effect of electric core.

Still referring to fig. 2, a protrusion 103 is disposed on a sidewall of the vacuum chamber 1, and a through hole 104 is disposed on a sidewall of the vacuum chamber 1 corresponding to the protrusion 103, it can be understood that the partition plate 2 is supported on the protrusion 103 and can be drawn out through the through hole 104; preferably, the inner wall of the through hole 104 is provided with a sealing strip 6 abutted to the separator 2, so that in the process of drawing out the separator 2, air is prevented from entering the cell accommodating cavity 102 to affect the hot-pressing effect of the cell.

It should be noted that the partition board 2 is made of a non-metallic material, so that friction with the film 3 can be reduced when the partition board 2 is pulled out, and the film 3 is prevented from being damaged in the process of pulling out the partition board 2; in this embodiment, the vacuum connector 4 includes a vacuum tube 401 and a valve 402 connected in series to the vacuum tube 401; the vacuum tube 401 is connected to an external vacuum pumping device, so as to realize vacuum pumping of the cell accommodating cavity 102.

Because the partition plate 2 is taken out, deionized water carries the film 3 to carry out hot pressing on the battery cell, as a preferred embodiment, a water outlet 7 is arranged at the bottom of one side of the battery cell accommodating cavity 102, the water outlet 7 can discharge liquid in the vacuum box 1 after the hot pressing of the battery cell is finished, and a pipe valve is arranged at the water outlet 7 to open or close the water outlet 7.

In the hot pressing process of electric core, at first place electric core in electric core holds chamber 102 with electric core, put into baffle 2, lay film 3 in open chamber 101 afterwards, pour the deionized water again, adopt heating mechanism 5 to heat the deionized water, it is preferred in this embodiment, with the temperature heating of deionized water to 95 +/-3 can, treat that the deionized water heats to the required temperature of hot pressing, hold chamber 102 to electric core and carry out the evacuation, take out baffle 2 afterwards, film 3 seals the laminating on the surface of electric core under hydraulic effect, can accomplish the hot pressing of electric core.

This embodiment electric core hot press unit, electric core hot press unit make electric core hold chamber 102 and form sealed cavity through laying film 3 to utilize the vacuum to carry out hot pressing to electric core, take out baffle 2 after the evacuation, make the sealed laminating of film 3 in the bottom of vacuum chamber 1, sealed electric core simultaneously can make the whole of pole piece, especially cut thin the district and receive same pressure, can improve the degree that the thin district of cutting of pole piece and film 3 closely laminated, do benefit to the hot pressing effect that the pole piece cut thin the district in improving electric core.

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

1. The utility model provides a electricity core hot press unit which characterized in that, electricity core hot press unit includes:

a vacuum box (1);

the separator (2) is arranged in the vacuum box (1) and divides the vacuum box (1) into an open cavity (101) and a battery cell accommodating cavity (102) which are arranged up and down, the open cavity (101) is communicated with the outside, and the separator (2) is configured to be drawn out from the vacuum box (1);

the film (3) is laid in the open cavity (101), and the cell accommodating cavity (102) can form a sealed cavity by laying the film (3);

and the vacuum connecting piece (4) is connected with the battery cell accommodating cavity (102) and is configured to be connected with an external vacuumizing device so as to vacuumize the battery cell accommodating cavity (102).

2. The cell hot-pressing device of claim 1, characterized in that: the battery cell hot-pressing device further comprises a heating mechanism (5) used for heating the interior of the open cavity (101).

3. The cell hot-pressing device of claim 2, characterized in that: the heating mechanism (5) comprises an electric heating unit (501) and a temperature detection unit (502) which are arranged in the open cavity (101), and an electric control device which is respectively connected with the electric heating unit (501) and the temperature detection unit (502) to control the opening and closing of the electric heating unit (501).

4. The cell hot-pressing device of claim 1, characterized in that: be equipped with arch (103) on the lateral wall in vacuum box (1), and correspond to arch (103), in through-hole (104) have been seted up on the lateral wall of one side of vacuum box (1), baffle (2) are supported on arch (103), and can be by through-hole (104) take out.

5. The cell hot-pressing device of claim 4, characterized in that: and the inner wall of the through hole (104) is provided with a sealing strip (6) which is abutted against the partition plate (2).

6. The cell hot-pressing device of claim 1, characterized in that: the partition plate (2) is made of non-metal materials.

7. The cell hot-pressing device of claim 1, characterized in that: the film (3) is made of PE material.

8. The cell hot-pressing device of claim 1, characterized in that: the height D of the open cavity is greater than or equal to 300 mm.

9. The cell hot-pressing device of claim 1, characterized in that: the vacuum connector (4) comprises a vacuum tube (401) and a valve (402) connected in series to the vacuum tube (401).

10. The cell core hot-pressing device according to any one of claims 1 to 9, characterized in that: a water outlet (7) is arranged at the bottom of one side of the battery cell accommodating cavity (102).