Extrusion sealing device for lithium ion battery

Abstract

The utility model discloses a lithium ion battery extrusion sealing device which comprises a bottom plate, a battery extrusion mechanism is arranged on the upper end face of the bottom plate, and the battery extrusion mechanism comprises a front fixing plate and a rear fixing plate which are fixedly installed on the front side and the rear side of the bottom plate respectively. A plurality of guide shafts which are transversely arranged in parallel are connected between the front fixing plate and the rear fixing plate, and a front base plate, a plurality of battery partition plates and a rear base plate are sequentially connected to the guide shafts from the front side to the rear side in a sliding mode. The rear side of the front base plate, the front and rear sides of the battery partition plates and the front side of the rear base plate are respectively provided with bosses for extruding the large surfaces of the batteries to be sealed; the batteries to be sealed are placed between the front base plate and the battery partition plates, between the battery partition plates and the rear base plate and between the two battery partition plates; the sealing tool is simple in structure and convenient to operate, compared with an original sealing tool, the battery partition plate is added when the battery is extruded, negative extrusion on the two sides of the large face of the battery is achieved through the bosses on the battery partition plate, and the sealing thickness of the battery can be guaranteed to the maximum extent.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium-ion battery processing, and particularly relates to a lithium-ion battery extrusion sealing device. Background Art

[0002] In the current production of lithium-ion batteries, the sealing process can prevent the electrode materials and electrolytes of lithium-ion batteries from coming into contact with external air, moisture, and oxygen, and prevent the rapid deterioration of battery performance. This process is generally carried out in a dry environment. However, usually, after sealing, during the charge and discharge process, the positive electrode material and the negative electrode material react with the electrolyte to varying degrees, generating gas. As the amount of gas increases continuously, the lithium-ion battery gradually expands. When it expands to a certain extent, the lithium-ion battery can not only not be placed in the original battery position, but also its cycle performance and capacity deteriorate significantly. This is the so-called "gas swelling" problem of lithium-ion batteries.

[0003] The existing battery extrusion sealing tooling uses a ball screw to extrude the battery, and manual handwheels need to be rotated. The batteries are in contact with each other. The main problems are that the battery thickness is the center thickness of the large surface of the battery, and the large surface of the battery is prone to bulging. In this overall extrusion method where the batteries are in contact with each other, since the edges of the battery case are difficult to be extruded, the extrusion effect of the battery thickness is not good. Summary of the Utility Model

[0004] Aiming at the technical problems brought by the mutual contact of batteries when the existing battery extrusion sealing tooling extrudes the battery as pointed out in the above background art, the purpose of the utility model is to provide a lithium-ion battery extrusion sealing device.

[0005] To achieve the purpose of the utility model, the technical solution provided by the utility model is as follows:

[0006] A lithium-ion battery extrusion sealing device includes a bottom plate. A battery extrusion mechanism is arranged on the upper end surface of the bottom plate. The battery extrusion mechanism includes a front fixing plate and a rear fixing plate fixedly installed on the front and rear sides of the bottom plate respectively. A plurality of laterally parallel guide shafts are connected between the front fixing plate and the rear fixing plate. A front cushion plate, a plurality of battery partition plates, and a rear cushion plate are sequentially slidably connected on the guide shafts from the front side to the rear side. Convex platforms for extruding the large surfaces of the batteries to be sealed are respectively arranged on the rear side of the front cushion plate, the front and rear sides of the battery partition plates, and the front side of the rear cushion plate. The batteries to be sealed are placed between the front cushion plate and the battery partition plates, between the battery partition plates and the rear cushion plate, and between two battery partition plates;

[0007] A driving mechanism is installed on the front fixing plate, and the front cushion plate is driven to move on the guide shaft through the driving mechanism to extrude the batteries to be sealed.

[0008] Among them, there are 4 guiding shafts, which are arranged in a square shape and pass through the four corners of the front cushion plate, the battery separator and the rear cushion plate respectively.

[0009] Among them, battery positioning mechanisms are arranged on the rear side of the front cushion plate and the battery separator or on the front side of the battery separator and the rear cushion plate.

[0010] Among them, the battery positioning mechanism includes two positioning blocks arranged at longitudinal intervals, and the battery to be sealed is arranged between the two positioning blocks.

[0011] Among them, the upper end of the structure between the two positioning blocks is open.

[0012] Among them, the driving mechanism includes a cylinder, the cylinder is horizontally fixed on the front fixing plate, and the end of its piston rod is connected to the front side of the front cushion plate. By the telescopic movement of the piston rod, the front cushion plate is driven to move.

[0013] Among them, on the bottom plate, a steel ball impact pin mechanism is further arranged on one side of the battery extrusion mechanism.

[0014] Among them, the steel ball impact pin mechanism includes a side bracket capable of moving in a direction close to and away from the battery extrusion mechanism. A striker mounting beam is arranged on the side bracket in the front-back direction, and a plurality of striker assemblies corresponding to the liquid injection holes of a plurality of batteries to be sealed are arranged on the striker mounting beam.

[0015] Among them, the striker assembly includes a striker, a guide sleeve, a spring and a limit ring. The guide sleeve is installed in the mounting hole on the striker mounting beam. The striker includes an upper end portion, a middle portion and a lower end portion with gradually decreasing diameters. The guide hole of the guide sleeve includes a large-diameter hole and a small-diameter hole connected in sequence from top to bottom. The upper end portion is slidably connected to the large-diameter hole. A spring is sleeved on the middle portion located in the large-diameter hole. The middle portion is slidably connected to the small-diameter hole. A limit ring for preventing the striker from disengaging from the guide sleeve is sleeved on the middle portion extending out of the guide sleeve.

[0016] Among them, the side bracket is slidably connected to the linear slideway arranged on the bottom plate.

[0017] Compared with the prior art, the structure of the present application is simple and the operation is convenient. Compared with the original sealing tooling, a battery separator is added when extruding the battery. Through the convex platform on the battery separator, negative extrusion is realized on both sides of the large surface of the battery, and the sealing thickness of the battery can be guaranteed to the greatest extent.

[0018] In addition, by indirectly hitting the ball with the impact pin, it can avoid the depression at the liquid injection hole of the battery cover caused by the non-horizontal falling of the hammer head when hitting the steel ball, thus causing the problem of liquid leakage from the liquid injection hole, effectively eliminating the defect of liquid leakage, thereby improving the overall production qualification rate and safety of the battery, reducing the labor intensity of employees and improving the operation efficiency, being beneficial to be widely applied in production, and having great practical significance in production.

[0019] In addition, using a cylinder to squeeze instead of a hand-cranked handwheel reduces the labor intensity of employees and improves operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the first schematic diagram of the device structure provided by the embodiment of the present utility model;

[0021] In the figure, side bracket 1, linear slideway 2, slideway mounting block 3, striker mounting beam 4, striker assembly 5, cylinder 6, front fixing plate 7, bottom plate 8, front cushion plate 9, positioning block 10, battery to be sealed 11, guide shaft 12, battery partition 13, rear fixing plate 14, rear cushion plate 15;

[0022] Figure 2 It is the second schematic diagram of the device structure provided by the embodiment of the present utility model;

[0023] Figure 3 It is the schematic diagram of the structure at the rear side of the front cushion plate provided by the embodiment of the present utility model;

[0024] Figure 4 It is the schematic diagram of the structure at the front side of the partition provided by the embodiment of the present utility model;

[0025] In the figure, boss 132;

[0026] Figure 5 It is the schematic diagram of the structure at the rear side of the partition provided by the embodiment of the present utility model;

[0027] Figure 6 It is the schematic diagram of the structure at the front side of the rear cushion plate provided by the embodiment of the present utility model;

[0028] Figure 7 It is the schematic diagram of the structure at the rear side of the rear cushion plate provided by the embodiment of the present utility model;

[0029] Figure 8 It is the schematic diagram of the structure of the steel ball striker mechanism provided by the embodiment of the present utility model;

[0030] In the figure, striker 51, guide sleeve 52, spring 53, limit ring 54. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] Next, with reference to the drawings in the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0032] As Figures 1 - 8As shown, it is the structural embodiment of the present application.

[0033] Embodiment 1

[0034] This embodiment provides a lithium-ion battery extrusion sealing device, including a bottom plate 8. On the upper end surface of the bottom plate 8, a battery extrusion mechanism is provided. The battery extrusion mechanism includes a front fixing plate 7 and a rear fixing plate 14 fixedly installed on the front and rear sides of the bottom plate 8 respectively. Between the front fixing plate 7 and the rear fixing plate 14, a plurality of horizontally parallel guide shafts 12 are connected. On the guide shafts 12, a front backing plate 9, a plurality of battery separators 13, and a rear backing plate 15 are slidably connected in sequence from the front side to the rear side. On the rear side of the front backing plate 9, on the front and rear sides of the battery separators 13, and on the front side of the rear backing plate 15, convex platforms 132 for extruding the large surfaces of the battery 11 to be sealed are respectively provided. The battery 11 to be sealed is placed between the front backing plate 9 and the battery separators 13, between the battery separators 13 and the rear backing plate 15, and between two battery separators 13.

[0035] A driving mechanism is installed on the front fixing plate 7. By driving the driving mechanism, the front backing plate 9 is driven to move on the guide shafts 12 to extrude the battery to be sealed.

[0036] It should be noted that, as Figure 1 shown, in this embodiment, the guide shafts 12 are four in number, and the four guide shafts 12 are arranged in a square shape, passing through the four corners of the front backing plate 9, the battery separators 13, and the rear backing plate 15 respectively. Of course, two can also be used, arranged diagonally.

[0037] It should be noted that in this embodiment, there are 7 battery separators, and a total of 8 batteries are placed. The setting of the battery separators is convenient for the gas inside the battery to be discharged. The setting of the convex platforms ensures the extrusion effect on both sides of the large surface of the battery.

[0038] In a preferred embodiment, a battery positioning mechanism is provided on the rear side of the front backing plate 9 and the battery separators 13 or on the front side of the battery separators 13 and the rear backing plate 15.

[0039] Among them, the battery positioning mechanism provided in this embodiment includes two positioning blocks 10 arranged at intervals longitudinally. The battery 11 to be sealed is arranged between the two positioning blocks 10.

[0040] In a preferred embodiment, the upper end of the structure between the two positioning blocks 10 is open, which is convenient for the battery to be put in.

[0041] Working process:

[0042] Step 1, place the battery to be sealed with the liquid injection hole facing up and upright between the front backing plate 9 and the battery separators 13, between the battery separators 13 and the rear backing plate 15, and between two battery separators 13.

[0043] Step 2: Control the driving mechanism to drive the front backing plate 9 to extrude the battery to be sealed, and discharge the gas inside the battery to be sealed;

[0044] Step 3: Place the steel ball on the liquid injection hole;

[0045] Step 4: Pull the side bracket to the innermost end. At this time, the position of the firing pin exactly corresponds to the position of the steel ball. Use a hammer to strike the firing pin to drive the steel ball into the liquid injection hole;

[0046] Step 5: Control the driving mechanism to pull the front backing plate 9 back to the left, and take out the battery to be sealed from the battery separator.

[0047] Embodiment 2

[0048] In the traditional technology, the extrusion method used requires manual hand-cranking of the handwheel to extrude the battery through the ball screw, which is time-consuming and laborious. To solve this problem, the driving mechanism provided in this embodiment includes a cylinder 6, the cylinder 6 is horizontally fixed on the front fixing plate 7, and the end of its piston rod is connected to the front side of the front backing plate 9. By the telescopic movement of the piston rod, the front backing plate 9 is driven to move.

[0049] Using cylinder extrusion instead of hand-cranking the handwheel reduces the labor intensity of employees and improves the operation efficiency.

[0050] Embodiment 3

[0051] In the traditional technology, when sealing the ball, manually use a hammer to directly strike the steel ball located on the liquid injection hole of the battery cover. When sealing the ball, the plane of the hammer head cannot be guaranteed to be completely horizontal, which easily deforms the battery cover and causes liquid leakage at the sealed ball of the battery.

[0052] To solve the above problems, the technical solution provided in this embodiment is as follows: On the bottom plate 8, a steel ball firing pin mechanism is further provided on one side of the battery extrusion mechanism.

[0053] In this embodiment, the steel ball firing pin mechanism includes a side bracket 1 that can move in the direction close to and away from the battery extrusion mechanism. A firing pin mounting beam 4 is arranged on the side bracket 1 in the front-back direction, and a plurality of firing pin assemblies 5 corresponding to the positions of the liquid injection holes of a plurality of batteries 11 to be sealed are arranged on the firing pin mounting beam 4. Among them, the firing pin assembly includes a firing pin 51, a guide sleeve 52, a spring 53, and a limit ring 54. The guide sleeve 52 is installed in the mounting hole on the firing pin mounting beam 4. The firing pin 51 includes an upper end portion, a middle portion, and a lower end portion with gradually decreasing diameters. The guide hole of the guide sleeve 52 includes a large-diameter hole and a small-diameter hole connected in sequence from top to bottom. The upper end portion is slidably connected to the large-diameter hole. A spring 53 is sleeved on the middle portion located in the large-diameter hole. The middle portion is slidably connected to the small-diameter hole. A limit ring 54 for preventing the firing pin 51 from disengaging from the guide sleeve 52 is sleeved on the middle portion extending out of the guide sleeve 52.

[0054] The side bracket 1 is slidably connected to the linear slideway 2 provided on the bottom plate 8. As shown in the figure, the linear slideway 2 is connected to the bottom plate 8 through a slideway mounting block 3.

[0055] Finally, it should be noted that the above embodiments are only used for exemplifying and explaining the present invention, and are not intended to limit the present invention to the scope of the described embodiments. In addition, those skilled in the art can understand that the present invention is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of protection required by the present invention.

Claims

1. A lithium-ion battery extrusion sealing device, characterized in that: The invention comprises a bottom plate (8), wherein the upper end surface of the bottom plate (8) is provided with a battery extrusion mechanism, wherein the battery extrusion mechanism comprises a front fixing plate (7) and a rear fixing plate (14) respectively fixedly mounted on the front and rear sides of the bottom plate (8), wherein a plurality of transversely parallel guide shafts (12) are connected between the front fixing plate (7) and the rear fixing plate (14), wherein a front pad (9), a plurality of battery separators (13), and a rear pad (15) are sequentially slidably connected to the guide shafts (12) from the front side to the rear side, wherein the rear side of the front pad (9), the front and rear sides of the battery separator (13), and the front side of the rear pad (15) are respectively provided with bosses (132) for extruding the large surface of the battery (11) to be sealed, wherein the battery (11) to be sealed is placed between the front pad (9) and the battery separator (13), between the battery separator (13) and the rear pad (15), and between the two battery separators (13); A driving mechanism is installed on the front fixing plate (7), and the driving mechanism drives the front pad (9) to move on the guide shaft (12) to squeeze the sealed battery to be tested.

2. The lithium-ion battery extrusion sealing device according to claim 1, characterized in that: There are four guide shafts (12), which are arranged in a square shape and pass through the four corners of the front pad (9), the battery separator (13), and the rear pad (15) respectively.

3. The lithium-ion battery extrusion sealing device according to claim 1, characterized in that: A battery positioning mechanism is provided on the rear sides of the front pad (9) and the battery separator (13) or on the front sides of the battery separator (13) and the rear pad (15).

4. The lithium-ion battery extrusion sealing device according to claim 3, characterized in that: The battery positioning mechanism comprises two positioning blocks (10) arranged at a longitudinal interval, and the battery (11) to be sealed is arranged between the two positioning blocks (10).

5. The lithium-ion battery extrusion sealing device according to claim 4, characterized in that: The upper end of the structure between the two positioning blocks (10) is open.

6. The lithium-ion battery extrusion sealing device according to claim 1, characterized in that: The driving mechanism comprises a cylinder (6) which is transversely fixed on a front fixing plate (7). The end of a piston rod of the cylinder (6) is connected to the front side of a front pad (9). The front pad (9) is driven to move by the extension and retraction of the piston rod.

7. The lithium-ion battery extrusion sealing device according to any one of claims 1 to 6, characterized in that: A steel ball striker mechanism is also provided on the bottom plate (8) on one side of the battery squeezing mechanism.

8. The lithium-ion battery extrusion sealing device according to claim 7, characterized in that: The steel ball striker mechanism comprises a side bracket (1) that can move in a direction approaching and away from a battery pressing mechanism, a striker mounting beam (4) is arranged on the side bracket (1) in a front-to-rear direction, and a plurality of striker assemblies (5) corresponding to the positions of injection holes of a plurality of batteries (11) to be sealed are arranged on the striker mounting beam (4).

9. The lithium-ion battery extrusion sealing device according to claim 8, characterized in that: The striker assembly comprises a striker (51), a guide sleeve (52), a spring (53) and a limit ring (54); the guide sleeve (52) is mounted in a mounting hole on a striker mounting beam (4); the striker (51) comprises an upper end, a middle portion and a lower end with diameters decreasing successively; the guide hole of the guide sleeve (52) comprises a large diameter hole and a small diameter hole connected successively from top to bottom; the upper end is slidably connected to the large diameter hole; the middle portion located in the large diameter hole is sleeved with a spring (53); the middle portion is slidably connected to the small diameter hole; the middle portion extending out of the guide sleeve (52) is sleeved with a limit ring (54) for preventing the striker (51) from escaping from the guide sleeve (52).

10. The lithium-ion battery extrusion sealing device according to claim 9, characterized in that: The side bracket (1) is slidably connected to a linear slideway (2) arranged on the bottom plate (8).

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