Liquid injection transplanting jig of lithium ion battery

Abstract

The utility model relates to a liquid injection transplanting jig of a lithium ion battery, and belongs to the field of liquid injection of lithium battery cells. The jig body is provided with a plurality of battery cell accommodating cavities, the sealing ring is arranged between the jig body and the end cover, and sealing ring accommodating grooves for mounting the sealing ring are formed in the peripheries of the battery cell accommodating cavities; a vent groove communicated with the cavity is formed in the wall of the battery cell accommodating cavity, and an inflation groove communicated with the vent groove is formed above the vent groove; and the inflating groove is communicated with the bottom of the sealing ring accommodating groove. According to the utility model, through the arrangement of the vent groove and the inflation groove, when the internal pressure of the external jig for the battery cell is very high, gas enters the inflation groove through the vent groove and applies upward pressure to the sealing ring covering the upper part of the inflation groove, so that the sealing ring is more tightly combined with the tool jig, and the air tightness of the cavity is higher; and the problem that the air tightness is reduced due to high air pressure in the cavity is solved.

Description

Technical Field

[0001] The utility model relates to a structure for primary liquid injection of a lithium battery core, in particular to a liquid injection and transplanting fixture for a lithium ion battery, belonging to the field of liquid injection of lithium batteries. Background Art

[0002] With the rapid economic development and the continuous growth of energy demand, lithium batteries, as an efficient and environmentally friendly energy storage technology, are receiving more and more attention and application.

[0003] Injection is a key step in the lithium battery manufacturing process, and its purpose is to inject electrolyte into the battery. However, how to make the battery core absorb electrolyte efficiently and stably is a key research direction in this field.

[0004] In the prior art, a primary liquid injection machine usually adopts an isobaric liquid injection process to apply pressure to the inside and outside of the battery cell at the same time. The pressure difference between the inside of the battery cell and the outside of the shell is very small or non-existent. Logically speaking, the isobaric liquid injection process is a means to achieve high pressure and equal pressure. The electrolyte flows into the cup body through the liquid injection pump, and the cup body forces the electrolyte to be injected into the battery cell through the liquid injection nozzle by applying pressure. During the isobaric cycle process, vacuum, positive pressure, and normal pressure are alternately applied to allow the battery cell to fully absorb the electrolyte. However, in order to ensure equal pressure inside the battery cell and outside the shell, the air tightness of the liquid injection cavity is extremely high. Once the gas leaks and the pressure difference between the inside and outside is too large, it will cause irreversible damage to the battery cell. How to maintain a constant pressure inside the battery cell and inside the cavity (outside the battery cell) under high pressure is a technical problem that has always existed in the liquid injection process. Utility Model Content

[0005] The utility model aims to solve the above problems, thereby providing a liquid injection and transplanting jig for lithium ion batteries.

[0006] The technical solution of the utility model to solve the above problems is as follows:

[0007] A liquid injection and transplanting jig for lithium-ion batteries comprises a jig body having a plurality of battery cell accommodating cavities, an end cover and a sealing ring arranged between the jig body and the end cover, wherein the battery cell accommodating cavities are surrounded by sealing ring accommodating grooves for installing the sealing rings; a ventilation groove communicating with the cavity is arranged on the wall of the battery cell accommodating cavity, and an air filling groove communicating with the ventilation groove is arranged above the ventilation groove; the air filling groove is communicated with the bottom of the sealing ring accommodating groove.

[0008] As a preferred embodiment of the above technical solution, the battery cell accommodating cavity is divided into an upper part, a middle part and a lower part; the upper part and the lower part are used to place the cushion seat, and the width of the middle part is narrower than that of the upper part / lower part.

[0009] As a preferred embodiment of the above technical solution, the ventilation groove is arranged at a position corresponding to the middle part.

[0010] As a preferred embodiment of the above technical solution, the ventilation groove is a rectangular structure, which is connected to the battery cell accommodating cavity in the horizontal direction and connected to the charging groove in the vertical direction.

[0011] As a preferred embodiment of the above technical solution, a blank area is provided at the bottom of the sealing ring.

[0012] As a preferred embodiment of the above technical solution, the height of the sealing ring is greater than the depth of the sealing ring accommodating groove.

[0013] As a preferred embodiment of the above technical solution, the end cover is provided with a hollow groove matched with the upper end portion of the sealing ring.

[0014] As a preferred embodiment of the above technical solution, a V-shaped protrusion is provided at the center of the upper end surface of the sealing ring, and a V-shaped positioning groove is provided at the center of the empty groove.

[0015] As a preferred embodiment of the above technical solution, the width of the sealing ring is greater than the width of the inflation groove.

[0016] As a preferred embodiment of the above technical solution, the shape of the cushion seat is a U-shaped structure with a bottom cover.

[0017] In summary, the utility model has the following beneficial effects:

[0018] 1. The utility model provides a venting groove and an air-charging groove. When the pressure inside the external fixture of the battery core is very high, the gas will enter the air-charging groove through the venting groove and exert upward pressure on the sealing ring covering the upper part of the air-charging groove, so that the sealing ring is more tightly combined with the tooling fixture, thereby making the cavity more airtight, solving the problem of reduced airtightness caused by high air pressure in the cavity;

[0019] 2. The implementation of the technical solution of the utility model can make the liquid injection process not limited by the air tightness of the cavity, promote the absorption of electrolyte by the battery cell through high voltage, reduce the pressure maintenance time, and improve the production efficiency of the production line;

[0020] 3. With the implementation of the technical solution of the utility model, the air tightness of the cavity is no longer achieved only by pressing the gland, but also by using the cavity air pressure to push the sealing ring to achieve double sealing; the utilization of the sealing ring is improved, and the service life of the sealing ring can be extended;

[0021] 4. The technical solution of the utility model has a simple structure and a simple processing technology, which can achieve efficient production and save production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a structural schematic diagram of the utility model;

[0023] Figure 2 yes Figure 1 A sectional view from the main perspective;

[0024] Figure 3 yes Figure 2 A partial enlarged view of

[0025] In the figure, 1- fixture body, 11- battery cell accommodating chamber, 12- partition wall, 121- ventilation groove, 122- charging groove, 123- sealing ring accommodating groove, 11-1- upper part, 11-2- middle part, 11-3- lower part;

[0026] 2-sealing ring, 2-1-blank area, 2-2-V-shaped protrusion;

[0027] 3-end cover, 3-1 empty groove, 3-2-V-shaped positioning groove. DETAILED DESCRIPTION

[0028] The present invention is further explained below in conjunction with the accompanying drawings.

[0029] This specific implementation is merely an explanation of the utility model, not a limitation of the utility model. Any changes made by a person skilled in the art after reading the specification of the utility model will be protected by the patent law as long as they are within the scope of the claims.

[0030] like Figure 1-2 As shown, a lithium-ion battery injection and transplanting jig includes a jig body 1 having a battery cell accommodating cavity 11. Figure 1 As shown, the fixture body 1 of this embodiment has eight battery cell accommodating cavities 11. Adjacent battery cell accommodating cavities 11 share a partition wall 12, and the battery cell accommodating cavities 11 are formed between adjacent partition walls 12.

[0031] like Figure 1 As shown, the battery cell accommodating cavity 11 is divided into three parts. The upper part 11-1 and the lower part 11-3 are used to place the gasket seat, so the width of the middle part 11-3 is slightly narrower than the upper part to accommodate the correct placement of the battery cell. When the battery cell is placed, both ends are placed inside the gasket seat. The shape of the gasket seat is usually a hexahedral structure with a cavity and two open sides. The cavity is the same as the outside world through the two open sides, that is, one end of the battery cell is placed. The shape of the gasket seat is a U-shaped structure with a bottom cover. This is conventional for those skilled in the art, so it is not shown in the figure.

[0032] like Figure 2As shown, a venting groove 121 is provided on the wall of the partition wall 12; the venting groove 121 is provided on the wall corresponding to the middle part 11-3; an air filling groove 122 is provided at the upper end of the venting groove 121 and communicates with the venting groove 121; the venting groove 121 is also provided on the wall corresponding to the middle part 11-3. Figure 2 From the perspective of FIG. 1 , the ventilation groove 121 and the charging groove 122 are combined to form an L-shaped groove structure.

[0033] like Figure 1 As shown, a sealing ring accommodating groove 123 is downwardly provided on the upper end surface of the partition wall 12 . The sealing ring accommodating groove 123 is rectangular and is arranged around the battery cell accommodating cavity 11 and is close to the four edges of the battery cell accommodating cavity 11 .

[0034] like Figure 3 As shown, the vent groove 121 extends toward the inner direction of the wall, and the gas-filling groove 122 is arranged above the vent groove 121. Therefore, the sealing ring receiving groove 123 corresponds to the vent groove 121 in position, and in fact, the two are also connected, but the function of the sealing ring receiving groove 123 is to provide the sealing ring 2 for installation, so when the liquid injection process is implemented, the sealing ring receiving groove 123 is still blocked by the sealing ring 2 although it is connected with the vent groove 121. Furthermore, in this embodiment, a blank area 2-1 is arranged at the bottom of the sealing ring 2 to better bear the gas pressure, and bends and expands to both sides after bearing the gas, so that the bottom of the sealing ring 2 and the groove wall of the sealing ring receiving groove 123 are more closely attached to the ground.

[0035] The height of the sealing ring 2 is greater than the depth of the sealing ring accommodating groove 123 , so after the sealing ring 2 is installed, the upper portion of the sealing ring 2 protrudes from the upper end surface of the partition wall 12 .

[0036] It also includes an end cap 3, and the end cap 3 is provided with a hollow groove 3-1 at the position corresponding to the sealing ring 2, and the upper bottom of the hollow groove 3-1 is provided with a V-shaped positioning groove 3-2, and the upper end surface of the sealing ring 2 is provided with a V-shaped protrusion 2-2, and the V-shaped protrusion 2-2 is adapted to the V-shaped positioning groove 3-2 structure, so when the sealing ring 2 is subjected to upward pressure, it will be positioned without lateral displacement, and usually the V-shaped positioning groove 3-2 and the V-shaped protrusion 2-2 are both centrally arranged, so the sealing ring 2 is positioned in the central area of ​​the hollow groove 3-1, and will not be offset due to the effect of air pressure. This is very helpful for air tightness, because it means that there will not be a problem of a large gap on one side and a small gap on the other side, and a large gap on one side and a small gap on the other side will cause a problem of low air tightness, because in actual situations, especially when viewed from a magnified perspective, it is impossible for the sealing ring 2 to be completely sealed with the sealing ring accommodating groove / empty groove, and there is always a gap, and evenly distributing this gap can often further improve the air tightness.

[0037] Therefore, during the process of filling the battery cell, when the gas pressure inside the cavity increases, the gas will enter the charging groove 122 through the ventilation groove 121, thereby acting on the bottom of the sealing ring 2, causing the empty area 2-1 at the bottom of the sealing ring 2 to deform, and causing the edge of the empty area 2-1 to bend and expand to both sides, so that the bottom of the sealing ring 2 and the groove wall of the sealing ring accommodating groove 123 are more closely attached to the ground, thereby increasing the air tightness and avoiding the problem of air leakage caused by the increase in air pressure.

Claims

1. A lithium-ion battery injection and transplanting jig, comprising a jig body (1) having a plurality of battery cell accommodating cavities (11), an end cover (3), and a sealing ring (2) arranged between the jig body (1) and the end cover (3), wherein the battery cell accommodating cavities (11) are surrounded by sealing ring accommodating grooves (123) for installing the sealing ring (2); the characteristics are: A ventilation groove (121) in communication with the cavity is provided on the wall of the battery cell accommodating cavity (11); an air filling groove (122) in communication with the ventilation groove (121) is provided above the ventilation groove (121); the air filling groove (122) is in communication with the bottom of the sealing ring accommodating groove (123).

2. The lithium-ion battery injection and transplanting jig according to claim 1, characterized in that: The battery cell accommodating cavity (11) is divided into an upper portion (11-1), a middle portion (11-2) and a lower portion (11-3); the upper portion (11-1) and the lower portion (11-3) are used to place a cushion seat, and the width of the middle portion is narrower than that of the upper portion / the lower portion.

3. The lithium-ion battery injection and transplanting jig according to claim 2, characterized in that: The ventilation groove (121) is arranged at a position corresponding to the middle portion (11-2).

4. The lithium-ion battery injection and transplanting jig according to claim 1, characterized in that: The ventilation groove (121) is a rectangular structure, and is in communication with the battery cell accommodating cavity (11) in the horizontal direction, and is in communication with the inflation groove (122) in the vertical direction.

5. The lithium-ion battery injection and transplanting jig according to claim 1, characterized in that: A blank area (2-1) is provided at the bottom of the sealing ring (2).

6. The lithium-ion battery injection and transplanting jig according to claim 1, characterized in that: The height of the sealing ring (2) is greater than the depth of the sealing ring accommodating groove (123).

7. The lithium-ion battery injection and transplanting jig according to claim 6, characterized in that: The end cover (3) is provided with a hollow groove (3-1) adapted to the upper end portion of the sealing ring (2).

8. The lithium-ion battery injection and transplanting jig according to claim 7, characterized in that: A V-shaped protrusion (2-2) is provided at the center of the upper end surface of the sealing ring (2), and a V-shaped positioning groove (3-2) is provided at the center of the hollow groove (3-1).

9. The lithium-ion battery injection and transplanting jig according to claim 6, characterized in that: The width of the sealing ring (2) is greater than the width of the inflation groove (122).

10. The lithium-ion battery injection and transplanting jig according to claim 2, characterized in that: The cushion seat is in the shape of a U-shaped structure with a bottom cover.

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