CN204424392U - A kind of polymer Li-ion battery sealer mechanism of improvement - Google Patents

Abstract

The utility model discloses an improved polymer lithium-ion battery sealing film mechanism, which comprises a lifting cylinder, a head pressing plate pushed by the lifting cylinder, and a heat storage block fixed at the lower end of the head pressing plate; the heat storage block includes mutual Laminated and compressed fixed piece and heat storage piece, corresponding bolt holes are distributed on the head pressure plate, fixed piece and heat storage piece, the fixed piece is wedged into the head pressure plate, and passes through the corresponding bolt hole The bolts are fastened to the pressure plate of the head; the heat storage sheets are superimposed side by side on the side of the fixed sheet, and are fastened to the fixed sheet by pressing bolts on the corresponding bolt holes. The fixed sheet and the heat storage sheet are connected with the battery The surface of the film to be sealed is perpendicular to each other; a heating wire is arranged in the fixed sheet; a silica gel layer is arranged on the side of the heat storage block composed of the fixed sheet and the heat storage sheet for heat sealing. The utility model has the advantages of convenient use, strong applicability, good thermal sealing effect and stable packaging.

Description

An improved polymer lithium-ion battery sealing mechanism

technical field

The utility model belongs to the field of battery sealing tools, in particular to an improved polymer lithium ion battery sealing mechanism, especially suitable for the top sealing welding sol of 300Ah and above large-capacity batteries.

Background technique

Since the shell of the polymer lithium-ion battery is heat-sealed with aluminum-plastic film as a sealed battery shell, the aluminum-plastic film on the top of the battery must be welded together with the positive and negative tabs of the battery at high temperature, but the original device of the top sealer The sealing film indenter can only meet the aluminum-plastic film thermal packaging of cells with a number of layers of 20pcs and a tab size of less than 280mm. When making ultra-large capacity or large-capacity batteries, the packaging conditions for making small-capacity batteries, that is, the pressure The temperature is 0.6Mpa, the temperature is 195±5℃, and the time is 17s, once on the front and back sides, but after the liquid injection, it is easy to have air intake, liquid leakage, and poor corrosion caused by the poor packaging of the lugs, which shows that it is used to make small capacity The packaging conditions of the battery are not suitable for making ultra-large capacity or high-capacity batteries. The super-large capacity refers to greater than or equal to 500AH, and the term large capacity refers to greater than or equal to 300AH.

The solution at this stage is to prolong the heat-sealing time. Generally, the packaging time is increased to 21s. Although the packaging effect has been improved, due to the long packaging time, there is over-sealing at the non-tab and the diaphragm melts, resulting in Corrosion of the battery core and the unfavorable consequences of easy breakage at the non-tab.

In addition, when pressing down welding, the strip-shaped lower pressing plate originally conducts heat to the top of the battery for high-temperature melting welding, but in fact, part of the heat will be conducted to the main body of the battery through the positive and negative tabs, and the larger the battery capacity, the main body also The larger the battery, the larger the body, the more heat will be conducted to the battery body, and the heat will be absorbed by the battery body. Therefore, the larger the battery, the lower the top sealing welding temperature will be. In view of the above reasons, in the production The sealing film indenter that can be used for small cells can no longer be used in the production of large cells, which not only brings inconvenience to the processing of batteries with different capacities, but also takes time and effort to replace the sealing film indenter, and makes a large number of different The large or small sealing film pressure head causes waste of resources and increases the cost of production.

For the requirements of sealing and welding, the temperature should not be too low or too high. If it is too low, the welding will not work, and if it is too high, the aluminum-plastic film will become brittle due to over-melting. Therefore, the sealing and welding of large-capacity batteries cannot solve the problem of top sealing by increasing the temperature, otherwise the sol is not good and the welding is not strong in the parts with tabs, and the aluminum-plastic film will be over-melted and brittle in places without tabs, and the capacity will crack. , leading to problems such as battery leakage, gas production, and serious performance degradation in the later stage.

Utility model content

The technical problem to be solved by the utility model is to provide an improved polymer lithium-ion battery sealing film mechanism with convenient use, strong applicability, good thermal sealing effect and stable packaging.

The utility model adopts the following technical solutions:

An improved polymer lithium-ion battery sealing mechanism, which includes a lifting cylinder, a head pressing plate pushed by the lifting cylinder, and a heat storage block fixed at the lower end of the head pressing plate;

The heat storage block includes a fixed sheet and a heat storage sheet that are stacked and pressed against each other. Corresponding bolt holes are distributed on the head pressure plate, the fixed sheet and the heat storage sheet. The fixed piece is wedged into the head pressure plate, and The bolt holes are fastened to the head pressure plate through clamping bolts; the heat storage fins are superimposed side by side on the side of the fixed fins, and are fastened to the fixed fins through compression bolts on the corresponding bolt holes. The sheet and the heat storage sheet are perpendicular to the surface of the battery to be sealed.

As a further improvement to this solution, a heating wire is arranged in the fixing piece.

As a further improvement to this solution, the heat storage block composed of the fixed sheet and the heat storage sheet is provided with a silica gel layer on the side for heat sealing.

As a further improvement to this solution, the silica gel layer is fixed to the heat storage block by Teflon.

As a further improvement to this solution, the fixed sheet and the heat storage sheet on the side provided with the silica gel layer are arranged to form a groove, and the silica gel layer is arranged in the groove formed by the fixed sheet and the heat storage sheet.

As a further improvement to this solution, the fixed piece and the heat storage piece are made of copper material.

As a further improvement to this solution, the pressing bolts are evenly arranged in sequence on the heat storage sheet, and the clamping bolts are evenly arranged in sequence on the head pressure plate.

As a further improvement to this solution, the number of heat storage sheets is set according to the capacity of the battery to be heat-sealed. The larger the battery capacity, the more heat storage sheets to be added on the side of the fixed sheet. The heating surface area of the heat conduction part composed of the sheet and the heat storage sheet is also larger, so as to improve the heat storage.

For further description of this solution, the heat storage sheet can be arranged on both sides of the fixed sheet, or on one side of the fixed sheet; when the heat storage sheet is arranged on both sides of the fixed sheet, the two sides of the fixed sheet The heat storage sheets arranged on the side can be of different lengths, arranged into a groove according to the length, and the silica gel layer is placed in the groove, so that the silica gel layer is not easy to fall off and move. and the heat storage block are fixed tightly; when the heat storage sheet is arranged on one side of the fixed sheet, the lower edge of the heat storage sheet should be flush with the lower edge of the fixed sheet.

The beneficial effects of the utility model are:

(1) The utility model is provided with a fixed piece and a heat storage piece that can be freely disassembled and adjusted in width, so that the area of the heat-sealed head can be adjusted, which is convenient for flexible application, and can reduce the heat storage piece when used in a small battery , when used for large-capacity batteries, increase the heat storage sheet, that is, by reducing or increasing the heat storage capacity, one machine can be used for both small-size batteries and large-capacity batteries, saving time and effort, and avoiding the need to replace the sealing film pressure head At the same time, the cost is reduced. At the same time, there is a fixed piece inserted into the head pressure plate, so that after expansion after heating, it will not be separated from the head pressure plate due to deformation, but will be fixed more firmly due to expansion, and the fixed piece is inserted into the head pressure plate. There are bolt holes on the part, and the fixing piece is further fastened on the head pressure plate through the clamping bolts. Corresponding bolt holes are also set on the part of the fixing piece that is not inserted into the head pressure plate, so that the heat storage piece Fastened with the fixed piece, which greatly improves the stability of the package.

(2) The utility model proposes that the heat sealing of large-capacity batteries no longer solves the problem of top sealing by increasing the temperature, but improves the temperature of the top sealing position by adding detachable fixing pieces and heat storage pieces, thereby solving the problem of large-capacity batteries. The top seal welding of the capacity battery is not strong, and there are problems such as battery leakage and gas production in the later stage.

(3) The original encapsulation time is 21s, but the utility model only needs 17s encapsulation time after adding the fixing plate and the heat storage plate, which shortens the encapsulation time and improves the encapsulation efficiency.

(4) The fixing piece and the heat storage piece in the utility model are all fixed by means of bolt fastening, which is convenient for disassembly and assembly, simple and easy to operate.

(5) The utility model adds a silica gel layer for heat conduction, which has certain ductility after being pressed, so that the places with and without tabs are heated more evenly, and at the same time, it has a buffer for the pressing action of the head pressure plate and shock absorption.

Description of drawings

Fig. 1 is a schematic diagram of the use state of Embodiment 1 of the present utility model.

Fig. 2 is a schematic diagram of the use state of Embodiment 2 of the present utility model.

Fig. 3 is a schematic structural view of Embodiment 2 of the present utility model.

Among them, 1 battery, 2 heat storage block, 2-1 heat storage sheet, 2-2 fixed sheet, 3 silica gel layer, 4 compression bolt, 5 negative pole ear, 6 positive pole ear, 7 head pressure plate, 8 lifting cylinder, 9 Snap bolts.

Detailed ways

Below in conjunction with accompanying drawing 1～3, the utility model is further described.

Embodiment 1, referring to FIG. 1 : it includes a lifting cylinder 8, a head pressure plate 7 pushed by the lifting cylinder 8, and a heat storage block 2 fixed at the lower end of the head pressure plate 7;

The heat storage block 2 includes a fixed piece 2-2 and a heat storage piece 2-1 that are stacked and pressed against each other. Corresponding bolts are distributed on the head pressure plate 7, the fixed piece 2-2 and the heat storage piece 2-1. hole, the fixed piece 2-2 is wedged into the head pressure plate 7, and is fastened to the head pressure plate 7 through the locking bolt 9 on the corresponding bolt hole; the heat storage piece 2-1 is superimposed on the fixed piece side by side 2-2 side, and fasten the fixing piece 2-2 through the compression bolt 4 on the corresponding bolt hole, the fixing piece 2-2 and the heat storage piece 2-1 are connected with the surface of the battery 1 to be sealed perpendicular to each other.

As a further improvement to this solution, a heating wire is arranged in the fixing piece 2-2.

As a further improvement to this solution, a silica gel layer 3 is provided on the side of the heat storage block 2 composed of the fixed sheet 2-2 and the heat storage sheet 2-1 which is used for heat sealing.

As a further improvement to this solution, the silica gel layer 3 is fixed to the heat storage block 2 by Teflon.

As a further improvement to this solution, the fixing sheet 2-2 and the heat storage sheet 2-1 are made of copper material.

As a further improvement to this solution, the pressing bolts 4 are uniformly arranged sequentially on the heat storage sheet 2 - 1 , and the clamping bolts 9 are uniformly arranged sequentially on the head pressure plate 7 .

Referring to Figures 2 to 3, Embodiment 2 is a further improvement to this scheme. The fixed sheet 2-2 and the heat storage sheet 2-1 on the side provided with the silica gel layer 3 are arranged in grooves, and the silica gel layer 3 is arranged on the In the groove formed by the fixed sheet 2-2 and the heat storage sheet 2-1.

As a further improvement to this solution, set the number of heat storage sheets 2-1 according to the capacity of the battery to be heat-sealed. The larger the battery capacity, the more heat storage sheets 2-1 will be added on the side of the fixed sheet 2-2. The more the number, the larger the heating surface area of the heat conduction part made up of the stationary sheet 2-2 and the heat storage sheet 2-1, so as to improve the heat storage.

For further description of this solution, the heat storage sheet 2-1 can be arranged on both sides of the fixed sheet 2-2, or on one side of the fixed sheet 2-2; when the heat storage sheet 2-1 is arranged on When the two sides of the fixed piece 2-2 are arranged, the heat storage pieces 2-1 arranged on both sides of the fixed piece 2-2 can be of different lengths, arranged into a groove according to the length, and the silica gel layer 3 is placed in the groove , so that the silica gel layer 3 is not easy to fall off and move. In order to further fix, the silica gel layer 3 and the heat storage block 2 can be fixed tightly with Teflon; when the heat storage sheet 2-1 is arranged on the side of the fixed sheet 2-2, The lower edge of the heat storage sheet 2-1 should be flush with the lower edge of the fixed sheet 2-2.

The realization principle of the present utility model is as follows:

According to the size of the battery capacity to be heat-sealed, the quantity of the heat storage sheet 2-1 is set, the larger the battery capacity, the more the quantity of the heat storage sheet 2-1 to be increased on the side of the fixed sheet 2-2, namely The heating surface area of the heat conduction part made up of the heat storage sheet 2-1 and the fixed sheet 2-2 is also larger, so as to improve the heat storage capacity.

The polymer battery casing is heat-packed with aluminum-plastic film as a sealed battery casing. The aluminum-plastic film on the top of the battery must be welded together with the positive tab 6 and negative tab 5 of the battery at high temperature. When the equipment is welded, the head is pressed. 7 is embedded with a piece of copper fixing piece 2-2, which has a heating wire. When the battery is welded, the head pressure plate 7 with the heat storage piece 2-1 will descend under the drive of the lifting cylinder 8, and press on the aluminum-plastic plate of the battery. Membrane and positive pole ear 6, negative pole ear 5, make it hot-melt welding together, according to the needs of battery capacity size, heat storage piece 2-1 is installed on the side of fixed piece 2-2 additionally as required.

When welding under pressure, the heat is transferred to the heat storage sheet 2-1 through the fixed sheet 2-2, and the heat on the heat storage sheet 2-1 will be conducted to the main body of the battery through the positive tab 6 and the negative tab 5, so that the aluminum plastic The dissolution effect of the film and the ear gel reaches the standard.

The specific working process is as follows:

1. Add a 1200mm long, 0mm wide, and 15mm high pure copper heat conduction piece composed of heat storage sheet 2-1 and fixed sheet 2-2 under the head pressure plate 7;

2. Put the cell of battery 1 to be heat-sealed into the punched Pocket, and the size of the punching hole depends on the thickness of the cell;

3. Adjust the packaging parameters, the pressure is 0.6Mpa, the temperature is 195±5°C, and the time is 17s, front and back, each once, because the sealing film pressure head is soft-sealed when the pressure head drops, and one-time packaging can only guarantee the packaging of the upper head. effect, so the front and back sides should be packaged once. Of course, it can also be hard-sealed, but the versatility for batteries is poor, and a set of hard-sealed heads can only be fixed for one model, so the cost of producing batteries of different specifications will increase. Compared with the soft seal, it is not limited by the size of the model, so the soft seal is commonly used. Soft sealing is to make a groove under the sealing film pressure head, the purpose is that the silicone layer 3 placed in the groove is not easy to run, and then use Teflon to fix the silicone layer 3 together with the head pressure plate 7 tightly;

4. Push the jig of the battery cell with the battery 1 directly into the top sealing machine, press the packaging button, the lifting cylinder 8 drives the head pressure plate 7 and the heat storage sheet 2-1 and the fixing sheet 2-2 at the lower part After pressing down, the device will execute the packaging action. After the first packaging action is completed, the reverse side of the cell of battery 1 will be the same as the first packaging, and the entire top sealing action will be completed.

The above-mentioned implementations are only preferred embodiments of the present utility model, rather than an exhaustive list of feasible implementations of the present utility model. For those skilled in the art, any obvious changes made without departing from the principle and spirit of the utility model should be considered to be included in the protection scope of the claims of the utility model.

Claims (7)

1. An improved polymer lithium-ion battery sealing mechanism, characterized in that it includes a lifting cylinder (8), a head pressure plate (7) pushed by the lifting cylinder (8) and a head pressure plate (7) fixed on the The heat storage block (2) at the lower end; The heat storage block (2) includes a fixed piece (2-2) and a heat storage piece (2-1) that are laminated and pressed together, and the head pressure plate (7), the fixed piece (2-2) and the heat storage piece Corresponding bolt holes are distributed on the sheet (2-1), and the fixed sheet (2-2) is wedged into the head pressure plate (7), and is connected to the head pressure plate by the locking bolts (9) on the corresponding bolt holes. (7) are fastened; the heat storage fins (2-1) are superimposed side by side on the side of the stationary plate (2-2), and are connected to the stationary plate (2-2) through the compression bolts (4) on the corresponding bolt holes. 2) fastened to each other, the fixed sheet (2-2) and the heat storage sheet (2-1) are perpendicular to the surface of the battery (1) to be sealed. 2. An improved polymer lithium-ion battery sealing mechanism according to claim 1, characterized in that: said fixing piece (2-2) is provided with a heating wire. 3. An improved polymer lithium-ion battery sealing mechanism according to claim 1, characterized in that: the heat storage block ( 2) A silicone layer (3) is provided on the upper side for heat sealing. 4. An improved polymer lithium-ion battery sealing mechanism according to claim 3, characterized in that: the silica gel layer (3) is fixed to the heat storage block (2) by Teflon. 5. An improved polymer lithium-ion battery sealing mechanism according to claim 3 or 4, characterized in that: the fixing piece (2-2) and the heat storage piece on one side of the silicone layer (3) are placed (2-1) are arranged in a groove, and the silica gel layer (3) is arranged in the groove formed by the fixing sheet (2-2) and the heat storage sheet (2-1). 6. An improved polymer lithium-ion battery sealing mechanism according to claim 1, characterized in that: the fixing piece (2-2) and the heat storage piece (2-1) are made of copper material. 7. An improved polymer lithium-ion battery sealing mechanism according to claim 1, characterized in that: said compression bolts (4) are uniformly arranged in sequence on the heat storage sheet (2-1), said The retaining bolts (9) are evenly arranged sequentially on the head pressure plate (7).