A roller soft-pack lithium battery sealing device

Abstract

The present invention discloses a roller soft-pack lithium battery sealing device, including a roller assembly for air bag sealing and a clamping assembly for clamping the air bag, the roller assembly includes a plurality of upper roller modules and a plurality of lower roller modules, the upper roller module includes an upper roller, a first electric slip ring, a transmission shaft and a driving mechanism, and the upper roller has a first heating plate built in; the lower roller module includes a lower roller and a second electric slip ring, and the lower roller has a second heating plate built in; the upper roller corresponds to the lower roller up and down, and the upper roller and the lower roller are attached to the sealing position of the battery air bag; the clamping assembly clamps the two ends of the air bag. The beneficial effects of the present invention are: the present invention uses the upper and lower rollers arranged in a continuous manner to heat and pressurize the battery air bag, and realizes hot melt packaging synchronously during the circulation process; the heating temperature of each roller is relatively independent, and the hot melt packaging can be selected by constant temperature heating or variable temperature heating.

Description

Technical Field

[0001] The invention relates to the technical field of lithium batteries, in particular to a roller soft-pack lithium battery sealing device. Background Art

[0002] Soft-pack batteries are a common type of lithium-ion batteries. They are made by wrapping a layer of battery airbags on the surface of the wound battery core. The battery airbags are usually made of aluminum-plastic film. When a safety hazard occurs in a soft-pack battery, it will only burst due to inflation, rather than bursting like a steel-shell battery. In addition, soft-pack batteries are also light in weight, large in capacity, low in internal resistance, and flexible in design, and are very popular among electronic product manufacturers.

[0003] Among them, air bag sealing is an important process in the production of soft-pack batteries. The traditional packaging method is to seal the upper and lower ends of the air bag mouth with static pressure heating of the head. This method requires the soft-pack battery and the sealing head to be kept still, and the soft-pack battery cannot be packaged simultaneously during the circulation process. Secondly, the temperature setting of the head is constant, and the packaging process of the head gradually changing temperature cannot be realized. According to the deviation of the contact time, area and contact position between the air bag and the head, poor packaging will occur. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a roller soft-pack lithium battery sealing device in view of the deficiencies of the above-mentioned prior art.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a roller soft-pack lithium battery sealing device, comprising a roller assembly for air bag sealing and a clamping assembly for clamping the air bag, the roller assembly comprising a plurality of upper roller modules and a plurality of lower roller modules, the upper roller module comprising an upper roller, a first electric slip ring, a transmission shaft and a driving mechanism, the upper roller has a first heating plate built in, the upper roller is connected to the first electric slip ring, and the first electric slip ring is connected to the driving mechanism through the transmission shaft; the lower roller module comprises a lower roller and a second electric slip ring, the lower roller has a second heating plate built in, and the lower roller is connected to the second electric slip ring; the upper roller is arranged along an axial direction of a plane, the upper roller corresponds to the lower roller up and down, and the upper roller and the lower roller are attached to the sealing position of the battery air bag; the clamping assembly clamps the two ends of the air bag to move the battery along the arrangement direction of the upper and lower rollers.

[0006] In the above technical solution, the temperatures of the upper rollers and the lower rollers in the roller assembly are not all the same, and the roller assembly heats the air bag at a variable temperature.

[0007] In the above technical solution, the upper roller module is connected to an upper roller lifting mechanism, which drives the upper roller module to reciprocate in the vertical direction; the lower roller module is connected to a lower roller lifting mechanism, which drives the lower roller module to reciprocate in the vertical direction.

[0008] In the above technical solution, the upper roller lifting mechanism and the lower roller lifting mechanism are cylinders.

[0009] In the above technical solution, the upper and lower positions of the upper roller module and the lower roller module are interchanged.

[0010] In the above technical solution, the clamping assembly includes a clamping slider, a screw and a screw motor. The clamping slider is connected to the screw, the screw is connected to the screw motor, the clamping slider clamps the air bag, and the screw motor drives the screw to rotate and then drives the clamping slider to move linearly in the horizontal direction.

[0011] The beneficial effects of the present invention are as follows: the present invention uses continuously arranged upper and lower rollers to heat and pressurize the battery air bag, and simultaneously realizes hot melt packaging during the circulation process; the heating temperature of each roller is relatively independent, and constant temperature heating or variable temperature heating can be selected for hot melt packaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the planar structure of an embodiment of the present invention.

[0013] Figure 2 It is a schematic diagram of a top view of the structure of an embodiment of the present invention.

[0014] Reference numerals

[0015] 1. Roller assembly; 11. Upper roller module; 111. Upper roller; 112. First heating plate; 113. First electric slip ring; 114. Transmission shaft; 115. Driving mechanism; 116. Upper roller lifting mechanism; 12. Lower roller module; 121. Lower roller; 122. Second heating plate; 123. Second electric slip ring; 124. Lower roller lifting mechanism; 2. Clamping assembly; 3. Battery cell; 31. Air bag; 32. Sealing position. DETAILED DESCRIPTION

[0016] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0017] like Figure 1-2The figure shows an embodiment, a roller soft-pack lithium battery sealing device, including a roller assembly 1 and a clamping assembly 2, the roller assembly 1 includes a plurality of upper roller modules 11 and a plurality of lower roller modules 12, the upper roller module 11 includes an upper roller 111, a first electric slip ring 113, a transmission shaft 114 and a driving mechanism 115, the upper roller 111 has a first heating plate 112 built in, the upper roller 111 is connected to the first electric slip ring 113, the driving mechanism 115 is connected to the first electric slip ring 113 through the transmission shaft 114, the driving mechanism 115 drives the upper roller 111 to rotate and move, all the upper roller modules 11 are connected to an upper roller lifting mechanism 116, and the upper roller lifting mechanism 116 drives the upper roller module 11 to reciprocate in the vertical direction. Each lower roller module 12 includes a lower roller 121 and a second electric slip ring 123. The inner ring of the lower roller 121 is provided with a second heating plate 122. The lower roller 121 is connected to the second electric slip ring 123. The electric wire connection of the second heating plate 122 is connected to the external power supply through the second electric slip ring 123. All lower roller modules 12 are connected to a lower roller lifting mechanism 124. The lower roller lifting mechanism 124 drives the lower roller module 12 to reciprocate in the vertical direction. Each upper roller 111 and the lower roller 121 are in a corresponding relationship up and down. A plurality of upper rollers 111 and lower rollers 121 are arranged in sequence along a certain axial direction in the horizontal direction. Among them, the upper roller lifting mechanism 116 and the lower roller lifting mechanism 124 can use cylinders to achieve vertical reciprocating motion.

[0018] The outer layer of the battery cell 3 is wrapped with an air bag 31, which is generally made of an aluminum-plastic film shell. A section of aluminum-plastic film is left at the tail end and both sides of the wrapped battery. The front end of the battery is an opening of the aluminum-plastic film. The clamping assembly 2 clamps the air bag 31 at the opening end and the tail end of the battery. The supporting assembly generally uses a clamping slider, which is connected to a screw rod, which is connected to a screw motor. The clamping slider clamps the air bag 31, and the screw motor drives the screw rod to rotate and then drives the clamping slider to make a linear motion in the horizontal plane along the same axial direction as the upper and lower rollers. The upper roller 111 and the lower roller 121 are arranged at the upper and lower ends of the sealing position 32 at the open end of the aluminum-plastic film.

[0019] The upper roller lifting mechanism 116 drives the upper roller module 11 to move upward, and the lower roller lifting mechanism 124 drives the lower roller module 12 to move downward, so that space is vacated between the upper and lower rollers 121 for the battery to enter. The air bag 31 of the battery is clamped by the clamping assembly 2 and moved between the upper and lower rollers.

[0020] When performing heating and pressurizing sealing, the upper roller lifting mechanism 116 drives the upper roller module 11 to move downward, and the lower roller lifting mechanism 124 drives the lower roller module 12 to move upward, the upper roller 111 and the lower roller 121 move closer, the upper roller 111 is close to the upper surface of the sealing position 32 of the air bag 31, and the lower roller 121 is close to the lower surface of the sealing position 32 of the air bag 31, and the bottom end of the upper roller 111 and the top end of the lower roller 121 jointly squeeze the sealing position 32.

[0021] The first heating plate 112 in the upper roller 111 and the second heating plate 122 in the lower roller 121 are electrically heated to heat the upper roller 111 and the lower roller 121 to the temperature required for heat sealing. The driving mechanism 115 connected to the upper roller 111 drives the upper roller 111 to move. The speed at which the driving mechanism 115 drives the upper roller 111 to move is consistent with the speed at which the clamping assembly 2 clamps the air bag 31. The lower roller 121 rotates when the air bag 31 moves. The sealing position 32 of the air bag 31 is hot-melt packaged under the action of heating and pressurization.

[0022] Furthermore, the heating temperature of each upper roller 111 and lower roller 121 is adjustable, and the heating temperatures between the lower rollers 121 can be different from each other. According to the requirements of the heat sealing process, there can be a constant temperature heat sealing or a variable temperature heat sealing method. During constant temperature heat sealing, each upper roller 111 and lower roller 121 are set to the same temperature condition, and the air bag 31 is moved and heated at a constant temperature between the upper and lower rollers. During variable temperature heating, a constant temperature increase, an exponential temperature increase, or a temperature increase followed by a temperature decrease can be adopted. Specifically, it is necessary to adjust the temperature change amplitude between adjacent upper rollers 111 and lower rollers 121 to achieve the effect of variable temperature heating, and the temperatures of the corresponding upper and lower rollers should be consistent.

[0023] Furthermore, the upper roller module 11 and the lower roller module 12 can be interchanged in actual application, the lower roller 121 is connected to the driving mechanism for active rotation, and the upper roller 111 is not connected to the driving mechanism 115 for driven rotation.

[0024] Furthermore, the lower roller module 12 can also rotate in an active rotation manner, and the second electric slip ring 123 connected to the lower roller 121 is connected to a second transmission shaft (not marked), and the second transmission shaft is connected to a second drive mechanism (not marked), and the second drive mechanism drives the lower roller 121 to rotate actively. The upper roller 111 and the lower roller 121 rotate at the same linear speed. In order to ensure consistent speed, the drive mechanism 115 connected to each upper roller 111 is an integrated structure, and the drive mechanism 115 is driven by a motor, and the motor is connected to each transmission shaft through a belt; when the lower roller 121 also rotates actively, the second drive mechanism connected to the lower roller 121 can also be driven in an integrated structure, and the upper roller module 11 and the lower roller module 12 can also use a unified drive mechanism to ensure consistent speed.

[0025] The above embodiments are only for illustration rather than limitation of the present invention, so all equivalent changes or modifications made according to the method described in the scope of the present patent application are included in the scope of the present patent application.

Claims

1. A roller soft-pack lithium battery sealing device, characterized in that: The invention comprises a roller assembly for sealing an air bag and a clamping assembly for clamping the air bag, wherein the roller assembly comprises a plurality of upper roller modules and a plurality of lower roller modules, wherein the upper roller module comprises an upper roller, a first electric slip ring, a transmission shaft and a driving mechanism, wherein the upper roller has a first heating plate built in, the upper roller is connected to the first electric slip ring, and the first electric slip ring is connected to the driving mechanism through the transmission shaft; wherein the lower roller module comprises a lower roller and a second electric slip ring, wherein the lower roller has a second heating plate built in, and the lower roller is connected to the second electric slip ring; wherein the upper roller is arranged along an axial direction of a plane, and the upper roller and the lower roller are connected to each other. The rollers correspond to each other up and down, and the upper roller and the lower roller are attached to the sealing position of the battery air bag; the clamping assembly clamps the two ends of the air bag to move the battery along the arrangement direction of the upper and lower rollers; the temperatures of the upper rollers and lower rollers in the roller assembly are not all the same, and the roller assembly heats the air bag at a variable temperature; the upper roller module is connected to an upper roller lifting mechanism, and the upper roller lifting mechanism drives the upper roller module to reciprocate in the vertical direction; the lower roller module is connected to a lower roller lifting mechanism, and the lower roller lifting mechanism drives the lower roller module to reciprocate in the vertical direction.

2. The roller soft-pack lithium battery sealing device according to claim 1, characterized in that: The upper roller lifting mechanism and the lower roller lifting mechanism are cylinders.

3. The roller soft-pack lithium battery sealing device according to claim 1, characterized in that: The clamping assembly includes a clamping slider, a screw and a screw motor. The clamping slider is connected to the screw, the screw is connected to the screw motor, the clamping slider clamps the air bag, and the screw motor drives the screw to rotate and then drives the clamping slider to move linearly in the horizontal direction.

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