Glue injection jig and edge sealing process for an arc-shaped soft-pack lithium-ion battery

Abstract

The present invention provides a glue injection jig and an edge sealing process for an arc-shaped soft-pack lithium-ion battery. The glue injection jig includes an upper jig and a lower jig. The upper jig includes an upper panel and a glue blocking portion. The glue blocking portion is disposed on the lower surface of the upper panel. An arc-shaped groove for placing the arc-shaped soft-pack lithium-ion battery is provided on the upper side of the lower jig. The glue blocking portion enters the arc-shaped groove, and there is a gap between the glue blocking portion and the two fan-shaped side surfaces of the arc-shaped groove. A through glue injection hole is provided at the position of the upper panel above the gap. By using the glue injection jig provided by the present invention to assist in completing the edge sealing process of the arc-shaped soft-pack lithium-ion battery, the potential safety hazards during the use of the arc-shaped soft-pack lithium-ion battery can be reduced, the probability of edge folding and edge explosion can be reduced, the product quality can be improved, the glue injection jig is simple to operate, and the glue injection efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of soft-pack lithium-ion batteries, and particularly relates to a glue injection jig and a sealing edge process for an arc-shaped soft-pack lithium-ion battery. Background Art

[0002] With the continuous increase of the national GDP, people's requirements for digital products are also getting higher and higher, and various new types of smart watches, bracelets, and Bluetooth earphones are emerging in an endless stream. Due to the special shapes of these products, the requirements for the three-dimensional structure design of the battery are also getting higher and higher. The irregular-shaped soft-pack lithium-ion battery has quickly become one of the main energy sources for these products due to its flexible and variable design advantages. As a type of irregular-shaped soft-pack lithium-ion battery, the arc-shaped soft-pack lithium-ion battery is currently widely used. When manufacturing an arc-shaped soft-pack lithium-ion battery, it is necessary to use an aluminum-plastic film to wrap the battery cell. After wrapping, it is necessary to seal the edges of the aluminum-plastic film on both sides of the battery cell. The currently commonly used sealing edge process is to first fold the edge, and then perform hot sealing by ironing the edge after the folding is completed. When using the existing process for edge sealing, the folded edge after sealing is prone to bursting, and there are often burrs on the cross-section of the aluminum-plastic film. Due to the special shape of the arc-shaped soft-pack lithium-ion battery, wrinkles will be generated on the aluminum-plastic film after folding, and the burrs and wrinkles are likely to scratch the surface of the adjacent battery after battery grouping. If the battery surface is scratched, it is easy to cause phenomena such as battery swelling, edge rupture, and fire, posing a safety hazard for the subsequent use of the battery. Summary of the Invention

[0003] In order to solve the deficiencies of the existing technology, the present invention provides a glue injection jig and a sealing edge process for an arc-shaped soft-pack lithium-ion battery to improve the safety performance of the arc-shaped soft-pack lithium-ion battery.

[0004] In order to achieve the above object, the technical solution of the present invention is realized as follows:

[0005] A glue injection jig for an arc-shaped soft-pack lithium-ion battery includes an upper jig and a lower jig. The upper jig includes an upper panel and a glue blocking part. The glue blocking part is arranged on the lower surface of the upper panel. An arc-shaped groove for placing an arc-shaped soft-pack lithium-ion battery is arranged on the upper side of the lower jig. The glue blocking part enters the arc-shaped groove, and there is a gap between the glue blocking part and the two fan-shaped side surfaces of the arc-shaped groove. A through glue injection hole is arranged at the position of the upper panel above the gap.

[0006] Further, the glue blocking part includes a group of first baffles, a group of second baffles and an arc-shaped protrusion. The first baffles and the second baffles are connected end to end around the arc-shaped protrusion, and there is a gap between the first baffles and the two fan-shaped side surfaces of the arc-shaped groove.

[0007] Further, there are at least four glue injection holes, and they are arranged in pairs on the upper panel on both sides of the glue blocking part.

[0008] Further, a set of ear slots for clamping battery ear tabs are provided at one end of the arc-shaped groove.

[0009] Further, a liquid level sensor is disposed through the upper panel. The liquid level sensor includes a sensing end, and the sensing end extends into a gap left between the first baffle and the two fan-shaped sides of the arc-shaped groove.

[0010] Further, an edge-sealing process for an arc-shaped soft-pack lithium-ion battery using a glue injection jig includes the following steps:

[0011] (1) Cut off the corner materials on both sides of the sealing part of the aluminum-plastic film of the arc-shaped soft-pack lithium-ion battery.

[0012] (2) Fold the aluminum-plastic film at the sealing part of the aluminum-plastic film of the arc-shaped soft-pack lithium-ion battery along the direction of the center of the circle and closely attach it to the side of the battery cell to form an edge to be sealed, and the width of the edge to be sealed is less than the thickness of the battery cell.

[0013] (3) Place the arc-shaped soft-pack lithium-ion battery in the arc-shaped groove of the lower jig, and the ear tabs are clamped in the ear slots.

[0014] (4) Place the upper jig on the arc-shaped soft-pack lithium-ion battery. A set of first baffles respectively block the parts on both sides of the battery cell that are not covered by the edge to be sealed, and a set of second baffles respectively block the head end and the tail end of the battery cell, and the arc-shaped protrusion abuts against the arc-shaped concave surface of the battery cell.

[0015] (5) Use a syringe to inject glue into the gap from the glue injection hole. The liquid level sensor senses the glue liquid level in the gap. When the gap is filled with glue, the liquid level sensor gives an alarm and stops injecting glue.

[0016] (6) Place for 0.5 min to 8 min, and take out the battery after the glue is cured.

[0017] Further, the glue is one of acrylate pressure-sensitive glue, rubber-type pressure-sensitive glue, silicone-based pressure-sensitive glue, thermoplastic elastomer pressure-sensitive glue, and polyurethane pressure-sensitive glue that will not damage the aluminum-plastic film. The manufacturer of the liquid level sensor is: Shanghai Muxi Electronic Technology Co., Ltd., and the model is: M12.

[0018] Compared with the prior art, the glue injection jig and edge-sealing process for an arc-shaped soft-pack lithium-ion battery provided by the present invention have the following advantages:

[0019] 1. Using glue to seal the edge of the aluminum-plastic film can effectively seal the burrs at the cross-section of the aluminum-plastic film and the wrinkles of the outer fold, increase the smoothness on both sides of the battery cell, reduce the probability of scratching the surface of adjacent batteries after battery matching, and reduce the potential safety hazards during the use of the arc-shaped soft-pack lithium-ion battery.

[0020] 2. Using glue to seal the edge can seal the folded edge, reduce the explosion rate of the battery folded edge, and thus improve the product quality.

[0021] 3. Use glue that will not damage the aluminum-plastic film. After the glue is applied, it will not cause damage to the aluminum-plastic film, ensuring the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0023] Attached Figure 1 is a schematic diagram of the overall structure of the present invention;

[0024] Attached Figure 2 is a schematic diagram of the structure of the upper jig;

[0025] Attached Figure 3 is a schematic diagram of the overall structure of the arc-shaped soft-pack lithium-ion battery;

[0026] Attached Figure 4 is a comparison of the battery yield data produced by the processes of the examples and the comparative examples.

[0027] Explanation of the reference numerals in the drawings: 1 - glue-blocking part; 101 - arc-shaped protrusion; 102 - first baffle; 103 - second baffle; 2 - lower jig; 201 - arc-shaped groove; 202 - tab slot; 3 - arc-shaped soft-pack lithium-ion battery; 301 - tab; 302 - aluminum-plastic film; 303 - edge to be sealed; 304 - battery core; 4 - upper panel; 401 - glue injection hole; 402 - liquid level sensor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0029] Embodiment:

[0030] An arc-shaped soft-pack lithium-ion battery, as Figure 3 shown, includes a tab 301 and an arc-shaped battery core 304. One end of the arc-shaped battery core 304 leads out the tab 301, and the arc-shaped battery core 304 is wrapped with an aluminum-plastic film 302. A glue injection jig for an arc-shaped soft-pack lithium-ion battery, as Figures 1 to 2As shown in the figure, it includes an upper fixture and a lower fixture 2. The upper fixture includes an upper panel 4 and a glue-blocking part 1. The glue-blocking part 1 is arranged on the lower surface of the upper panel 4. The glue-blocking part 1 includes a group of first baffles 102, a group of second baffles 103 and an arc-shaped protrusion 101. The first baffles 102 and the second baffles 103 are connected end to end around the arc-shaped protrusion 101. An arc-shaped groove 201 for placing an arc-shaped soft-pack lithium-ion battery 3 is arranged on the upper side of the lower fixture 2. A group of ear slots 202 for clamping battery ear tabs are arranged at one end of the arc-shaped groove 201. The glue-blocking part 1 enters the arc-shaped groove 201. There is a gap between the first baffle 102 and the two fan-shaped sides of the arc-shaped groove 201. A through glue injection hole 401 is arranged at the position of the upper panel 4 above the gap. Preferably, there are at least four glue injection holes 401, and they are arranged in pairs on the upper panel 4 on both sides of the glue-blocking part 1. A liquid level sensor 402 is arranged through the upper panel 4. The liquid level sensor 402 includes an induction end, and the induction end extends into the gap left between the first baffle 102 and the two fan-shaped sides of the arc-shaped groove 201.

[0031] The edge sealing process of the arc-shaped soft-pack lithium-ion battery using the above glue injection fixture is as follows: First, cut off the corner materials on both sides of the sealing part of the aluminum-plastic film 302 of the arc-shaped soft-pack lithium-ion battery 3. Fold the aluminum-plastic film 302 at the sealing part of the aluminum-plastic film 302 of the arc-shaped soft-pack lithium-ion battery 3 along the direction of the center of the circle and closely adhere it to the side of the battery cell 304 to form a to-be-edge-sealed part 303. The width of the to-be-edge-sealed part 303 is smaller than the thickness of the battery cell 304. Place the arc-shaped soft-pack lithium-ion battery 3 in the arc-shaped groove 201 of the lower fixture 2, and the ear tab 301 is clamped in the ear slot 202. Place the upper fixture on the arc-shaped soft-pack lithium-ion battery 3. A group of first baffles 102 respectively block the places on both sides of the battery cell 304 that are not covered by the to-be-edge-sealed part 303. A group of second baffles 103 respectively block the head and tail of the battery cell 304, and the arc-shaped protrusion 101 abuts against the arc-shaped concave surface of the battery cell 304. The places where the battery cell 304 is covered by the first baffle 102, the second baffle 103 and the arc-shaped protrusion 101 can avoid being covered by glue. After the above operations are completed, use a syringe to inject glue into the gap from the glue injection hole 401. Acrylate pressure-sensitive adhesive is selected as the edge-sealing glue. In addition, rubber-type pressure-sensitive adhesive, silicone-based pressure-sensitive adhesive, thermoplastic elastomer pressure-sensitive adhesive, polyurethane pressure-sensitive adhesive and other glues that will not damage the aluminum-plastic film 302 can also be selected as the edge-sealing glue. The liquid level sensor 402 can sense the glue liquid level in the gap. When the glue is injected to the required liquid level, it will send an alarm to remind to stop injecting glue. After stopping injecting glue, place it for 0.5 min to 8 min to wait for the glue to cure. After the glue cures, the arc-shaped soft-pack lithium-ion battery 3 can be taken out, and the edge sealing of the aluminum-plastic film 302 is completed.

[0032] Comparative example:

[0033] An arc-shaped soft-pack lithium-ion battery, asFigure 3 As shown, it includes a tab 301 and a curved battery cell 304. One end of the curved battery cell 304 leads out the tab 301, and the curved battery cell 304 is coated with an aluminum-plastic film 302.

[0034] The edge-sealing process of the curved soft-pack lithium-ion battery includes the following steps:

[0035] (1) Battery trimming: Cut off the excess corner materials at the sealing part of the aluminum-plastic film 302 on both sides of the battery according to requirements, and the remaining width is less than the thickness of the battery.

[0036] (2) Battery edge folding: Fold the sealing edges at the two side positions of the battery in the direction of the center of the circle so that they are closely attached to the side of the battery cell 304.

[0037] (3) Battery edge ironing: Turn on the edge ironing machine. After the temperature and pressure reach the specifications, place the battery in the placement area of the edge ironing machine, press the double-start button, and take out the battery after completion.

[0038] The edge-folding yield rates of the curved soft-pack lithium-ion 3 produced by the processes of the examples and the comparative examples are respectively tested and recorded. As Figure 4 shown, the average yield rate of the curved soft-pack lithium-ion 3 produced by the examples is 99.02%, and the average yield rate of the curved soft-pack lithium-ion 3 produced by the comparative examples is 75.40%. The battery yield rate is significantly improved.

[0039] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A glue injection fixture for an arc-shaped soft-pack lithium-ion battery, characterized in that: It includes an upper fixture and a lower fixture (2). The upper fixture includes an upper panel (4) and a glue-blocking part (1). The glue-blocking part (1) is arranged on the lower surface of the upper panel (4). An arc-shaped groove (201) for placing an arc-shaped soft-pack lithium-ion battery (3) is arranged on the upper side of the lower fixture (2). The glue-blocking part (1) enters the arc-shaped groove (201), and there is a gap between the glue-blocking part (1) and the two sector-shaped side surfaces of the arc-shaped groove (201). A through glue injection hole (401) is arranged at the position of the upper panel (4) above the gap. The glue-blocking part (1) includes a group of first baffles (102), a group of second baffles (103) and an arc-shaped protrusion (101). The first baffles (102) and the second baffles (103) are connected end to end around the arc-shaped protrusion (101). There is a gap between the first baffles (102) and the two sector-shaped side surfaces of the arc-shaped groove (201). A liquid level sensor (402) is arranged through the upper panel 4. The liquid level sensor (402) includes a sensing end, and the sensing end extends into the gap left between the first baffle (102) and the two sector-shaped side surfaces of the arc-shaped groove (201). The arc-shaped soft-pack lithium-ion battery includes electrode tabs and an arc-shaped battery core, and the arc-shaped battery core is coated with an aluminum-plastic film.

2. The glue injection fixture for an arc-shaped soft-pack lithium-ion battery according to claim 1, wherein: A group of electrode tab slots (202) for clamping the electrode tabs of the battery are arranged at one end of the arc-shaped groove (201).

3. Edge sealing process of the arc-shaped soft-pack lithium-ion battery using the glue injection fixture for the arc-shaped soft-pack lithium-ion battery, characterized in that: It includes the following steps: (1) Cut off the corner materials on both sides of the sealing part of the aluminum-plastic film (302) of the arc-shaped soft-pack lithium-ion battery (3). (2) Fold the aluminum-plastic film (302) at the sealing part of the aluminum-plastic film (302) of the arc-shaped soft-pack lithium-ion battery (3) along the direction of the center of the circle and closely attach it to the side surface of the battery core (304) to form a to-be-sealed edge (303). (3) Place the arc-shaped soft-pack lithium-ion battery (3) in the arc-shaped groove (201) of the lower fixture (2), and clamp the electrode tabs (301) in the electrode tab slots (202). (4) Place the upper fixture on the arc-shaped soft-pack lithium-ion battery (3). A group of first baffles (102) respectively block the places on both sides of the battery core (304) that are not covered by the to-be-sealed edge (303). A group of second baffles (103) respectively block the head and tail of the battery core (304), and the arc-shaped protrusion (101) abuts against the arc-shaped concave surface of the battery core (304). (5) Inject glue into the gap from the glue injection hole (401) by using a syringe. (6) Take out the battery after the glue is cured. The glue injection fixture for the arc-shaped soft-pack lithium-ion battery includes an upper fixture and a lower fixture (2). The upper fixture includes an upper panel (4) and a glue-blocking part (1). The glue-blocking part (1) is arranged on the lower surface of the upper panel (4). An arc-shaped groove (201) for placing the arc-shaped soft-pack lithium-ion battery (3) is arranged on the upper side of the lower fixture (2). The glue-blocking part (1) enters the arc-shaped groove (201), and there is a gap between the glue-blocking part (1) and the two sector-shaped side surfaces of the arc-shaped groove (201). A through glue injection hole (401) is arranged at the position of the upper panel (4) above the gap. The glue-blocking part (1) includes a group of first baffles (102), a group of second baffles (103) and an arc-shaped protrusion (101). The first baffles (102) and the second baffles (103) are connected end to end around the arc-shaped protrusion (101). There is a gap between the first baffle (102) and the two sector-shaped side surfaces of the arc-shaped groove (201). There are at least four glue injection holes (401), and they are arranged in two groups on the upper panel (4) on both sides of the glue-blocking part (1) respectively. A group of ear slots (202) for clamping the battery ear tabs are arranged at one end of the arc-shaped groove (201). A liquid level sensor (402) is arranged through the upper panel (4). The liquid level sensor (402) includes an induction end, and the induction end extends into the gap between the first baffle (102) and the two sector-shaped side surfaces of the arc-shaped groove (201).

4. The edge sealing process of the arc-shaped soft-pack lithium-ion battery according to claim 3, wherein: In step (2), the width of the edge to be sealed (303) after folding the aluminum-plastic film (302) is less than the thickness of the battery core (304).

5. The edge sealing process of the arc-shaped soft-pack lithium-ion battery according to claim 3, characterized in that: The glue in step (5) is one of acrylate pressure-sensitive glue, rubber-type pressure-sensitive glue, silicone-based pressure-sensitive glue, thermoplastic elastomer pressure-sensitive glue, and polyurethane pressure-sensitive glue.

6. The edge sealing process of the arc-shaped soft-pack lithium-ion battery according to claim 3, characterized in that: In step (5), the liquid level sensor (402) senses the glue liquid level in the gap. When the glue is filled up, the liquid level sensor (402) gives an alarm.

7. The edge sealing process of the arc-shaped soft-pack lithium-ion battery according to claim 3, characterized in that: In step (6), the curing time of the glue is 0.5 min to 8 min.

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