Battery liquid injection tool with sealing performance detection function

Abstract

The utility model discloses a battery liquid injection tool with a sealing performance detection function. The battery liquid injection tool comprises a material cup, a supporting plate is arranged at the top of the cup; an upper pressing plate is arranged at the top opening of the material cup; rubber bases are arranged at the bottoms of the supporting plates; the rubber base is arranged at the top of the upper pressing plate; a liquid injection needle and a vacuum tube are arranged on the supporting plate, the rubber base and the upper pressing plate; the lower ends of the liquid injection needle and the vacuum tube extend into the cavity of the material cup; liquid injection heads are arranged at the bottoms of the material cups; the lower end of the liquid injection head is connected with a liquid injection opening in the top of a shell of the battery; an opening in the top end of the liquid injection needle is connected with one end of a liquid injection pipeline; the vacuum pipe is connected with one end of a vacuum pipeline; the other end of the vacuum pipeline is communicated with an extraction opening of vacuumizing equipment; and the other end of the electrolyte injection pipeline is communicated with an electrolyte injection port of the electrolyte injection machine. According to the utility model, the sealing performance of the battery shell can be detected, and liquid is directly injected after the sealing performance of the battery shell is detected to be qualified, so that a good infiltration effect of electrolyte on a pole piece in the battery shell is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially a battery liquid injection tool with sealing detection function. BACKGROUND

[0002] At present, lithium ion batteries have the advantages of high specific energy, multiple cycle times and long storage time, and are widely used not only in portable electronic devices (such as mobile phones, digital cameras and laptop computers), but also in electric vehicles, electric bicycles and electric tools and other large and medium-sized electric devices, so the performance requirements for lithium ion batteries are becoming higher and higher.

[0003] In the production process of lithium ion batteries, the liquid injection process is an extremely important link. With the increase of battery cell energy density, the compaction of pole pieces and the improvement of internal space utilization, the liquid injection difficulty increases, resulting in poor electrolyte infiltration effect, which will directly affect the performance of the battery in all aspects.

[0004] Battery liquid injection generally includes two processes. The first process is the process of electrolyte flowing from the outside of the battery into the inside of the shell. The second process is the infiltration process of electrolyte into the pole piece, diaphragm and inter-particle gap inside the battery after the first process is completed. The existing liquid injection process mainly uses the first process, and the second process is carried out in the normal temperature and high temperature standing process after liquid injection.

[0005] In addition, since the existing large cylindrical battery (large cylindrical battery, i.e. large size cylindrical battery, such as 4680, 4695 and other large cylindrical batteries) generally uses laser welding sealing, sealing detection of the battery shell needs to be carried out in advance when the liquid injection process is carried out. The common sealing detection method is to draw a certain vacuum degree in the battery, and then observe the pressure value after maintaining for a period of time. After the sealing of the battery shell is qualified, liquid injection is carried out, and then the electrolyte is sent into the pressure tank body for vacuum and pressure circulation to make the electrolyte completely enter the inside of the battery cell.

[0006] However, since the sealing detection tool and the liquid injection tool are two separate tools, after the sealing detection of the battery shell, the pressure in the battery shell is restored to normal pressure, and then liquid injection is carried out. At this time, the pressure inside the battery shell is equivalent to the outside, and it is difficult for the electrolyte to enter the inside of the shell from the outside of the battery shell. It is necessary to send the battery into the pressure tank body for vacuum and pressure circulation operation to realize the liquid injection of the electrolyte. This process requires longer time and energy consumption, and the electrolyte has poor infiltration effect on the pole piece.

[0007] Therefore, it is urgent to develop a technology that can solve the above technical problems. UTILITY MODEL CONTENTS

[0008] The utility model discloses a battery liquid injection tool with sealing detection function.

[0009] Therefore, the utility model provides a battery liquid injection tool with sealing detection function, including material cup, support plate, liquid injection needle and vacuum pipe,

[0010] The hollow material cup top is provided with the support plate of horizontal distribution,

[0011] The top opening of material cup is sealed with upper pressing plate,

[0012] The bottom of support plate is provided with rubber base,

[0013] The rubber base is arranged on the top of upper pressing plate,

[0014] The hollow liquid injection needle and hollow vacuum pipe are vertically penetrated and sealed on the support plate, rubber base and upper pressing plate,

[0015] The lower end of liquid injection needle and vacuum pipe extends into the inner cavity of material cup,

[0016] The bottom of material cup is provided with hollow liquid injection head,

[0017] The upper end opening of liquid injection head is communicated with the inner cavity of material cup,

[0018] The lower end of liquid injection head is sealedly connected with the shell top liquid injection port of battery needing to inject electrolyte,

[0019] The battery is arranged on the top of battery tray,

[0020] The top end opening of liquid injection needle is connected with one end of liquid injection pipeline,

[0021] The vacuum pipe is connected with one end of vacuum pipeline,

[0022] The other end of vacuum pipeline is communicated with the air outlet of external vacuumizing equipment,

[0023] The other end of liquid injection pipeline is communicated with the liquid injection port of external electrolyte liquid injection machine.

[0024] From the above technical scheme provided by the utility model can see, compared with the prior art, the utility model discloses a battery liquid injection tool with sealing detection function, scientific design, which can detect the sealing of the battery shell, and directly injects liquid after the sealing detection of the battery shell is qualified, at this time, the inside of the battery shell is under negative pressure, and there is a pressure difference with the outside world, under the action of atmospheric pressure, the electrolyte can be quickly injected into the battery shell, at the same time, because the sealing detection negative pressure is low, the gas between the pole pieces in the battery is effectively extracted, so the electrolyte entering the battery shell also speeds up the infiltration speed, ensuring the good infiltration effect of the electrolyte on the pole pieces in the battery shell, which has great practical significance. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 The utility model provides a kind of battery liquid injection tool with sealing detection function overall structure schematic view provided by the utility model;

[0026] Fig. 2 In the battery liquid injection tool with sealing detection function provided by the utility model, the structure schematic view of support plate and each component assembled thereon. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0028] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0029] In the description of the patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connect", "set" should be broadly understood, for example, it can be fixedly connected, set, or it can be detachably connected, set, or integrally connected, set. For those skilled in the art, the specific meaning of the above terms in the patent can be understood according to the specific circumstances.

[0030] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0031] Referring to Figs. 1-2 The utility model provides a battery liquid injection tool with sealing detection function, including cup 1, support plate 2, liquid injection needle 4 and vacuum pipe 4,

[0032] The hollow cup 1 top is provided with the support plate 2 of horizontal distribution,

[0033] The top opening of cup 1 is sealed with the upper pressing plate 102,

[0034] The bottom of support plate 2 is provided with rubber base 3,

[0035] The rubber base 3 is arranged on the top of upper pressing plate 102,

[0036] The hollow liquid injection needle 4 and hollow vacuum pipe 5 are vertically penetrated and sealed on support plate 2, rubber base 3 and upper pressing plate 102,

[0037] The lower end of liquid injection needle 4 and vacuum pipe 5 extends into the inner cavity of cup 1,

[0038] The bottom of cup 1 is provided with hollow liquid injection head 101,

[0039] The upper end opening of liquid injection head 101 is communicated with the inner cavity of cup 1,

[0040] The lower end of liquid injection head 101 is sealed and connected with the shell top liquid injection port of battery 6 needing to inject electrolyte,

[0041] The battery 6 is arranged on the top of battery tray 7,

[0042] The top end opening of liquid injection needle 4 is connected with one end of liquid injection pipeline,

[0043] The vacuum pipe 4 is connected with one end of vacuum pipeline,

[0044] The other end of vacuum pipeline is communicated with the air outlet of external vacuumizing equipment (such as vacuum pump),

[0045] The other end of liquid injection pipeline is communicated with the liquid injection port of external electrolyte liquid injection machine (namely liquid injection pump).

[0046] In the utility model, specifically realize, support board 2, be provided with first liquid injection needle through -hole and first vacuum pipe through -hole,

[0047] Rubber base 3 and upper pressing plate 102, in the position corresponding with first liquid injection needle through -hole, be provided with second liquid injection needle through -hole and third liquid injection needle through -hole respectively,

[0048] Rubber base 3 and upper pressing plate 102, in the position corresponding with first vacuum pipe through -hole, be provided with second vacuum pipe through -hole and third vacuum pipe through -hole respectively,

[0049] Liquid injection needle 4, from top to bottom sequentially pass through first liquid injection needle through -hole, second liquid injection needle through -hole and third liquid injection needle through -hole,

[0050] Vacuum pipe 5, from top to bottom sequentially pass through first vacuum pipe through -hole, second vacuum pipe through -hole and third vacuum pipe through -hole.

[0051] Specifically realize, liquid injection needle 4 and second liquid injection needle through -hole and third liquid injection needle through -hole are interference fit.

[0052] Specifically realize, vacuum pipe 5 and second vacuum pipe through -hole and third vacuum pipe through -hole are interference fit.

[0053] In the utility model, specifically realize, the top of battery tray 7 is provided with the positioning recess of cylindrical,

[0054] The lower end of battery 6 is embedded in the positioning recess of battery tray 7.

[0055] Specifically realize, the shape and size of the lower end of battery 6 correspond with the shape and size of the positioning recess of battery tray 7.

[0056] In the utility model, specifically realize, the shape of liquid injection head 101 is hollow cylindrical, and the upper and lower ends are both open.

[0057] In the utility model, specifically realize, the lower end of the liquid injection head 101 of the bottom of material cup 1 is inserted into the liquid injection port of the top of the shell of battery 6,

[0058] In the utility model, specifically realize, the lower end of the liquid injection head 101 of the bottom of material cup 1 is inserted into the liquid injection port of the top of the shell of battery 6,

[0059] In the utility model, specifically realize, the vertical length of liquid injection needle 4 is 2 / 5-1 / 2 of the vertical depth of material cup 1,

[0060] Specifically realize, the diameter of liquid injection needle 4 is 3-6mm.

[0061] In the utility model, specifically realize, vacuum pipe 5 is specifically vacuum metal pipe.

[0062] In the utility model, the vertical length of the vacuum tube 5 is 1 / 10-1 / 5 of the vertical depth of the material cup 1.

[0063] In the utility model, the diameter of the vacuum tube 5 is 3-6mm.

[0064] In the utility model, the bottom height of the liquid injection needle 4 is lower than the bottom height of the vacuum tube 5, and specifically can be 2-4mm apart, that is, the bottom of the liquid injection needle 4 is 2-4mm lower than the bottom of the vacuum tube 5.

[0065] It should be noted that the liquid injection needle 4 and the vacuum tube 5 have a certain height difference, which can avoid the electrolyte from splashing into the vacuum tube 5 during the liquid injection process, causing pollution and electrolyte loss.

[0066] In the utility model, a switch valve (i.e. vacuum valve) is arranged on the vacuum pipeline.

[0067] In the utility model, a pressure gauge is arranged on the vacuum pipeline.

[0068] In the utility model, the pressure gauge is located between the switch valve (i.e. vacuum valve) and the vacuum tube 4 on the vacuum pipeline, and the pressure gauge is closer to the vacuum tube 4 than the switch valve (i.e. vacuum valve).

[0069] It should be noted that for the utility model, the vacuumization operation on the material cup 1 and the shell of the battery 6 can be controlled through the program on the vacuumization equipment (such as a vacuum pump), and the pressure gauge is used to display the pressure in the material cup and the battery shell connected by the vacuum pipeline.

[0070] It should be noted that in the utility model, the pressure gauge is used to display the negative pressure value of the leakage test, and whether the leakage test is qualified can be judged.

[0071] It should be noted that for the utility model, the rubber base 4 is located at the bottom of the supporting plate 2 and contacts the upper part of the material cup 1 to improve the sealing performance, and the diameter of the rubber base 4 is 18-20mm.

[0072] It should be noted that the liquid injection pipeline and the liquid injection needle, the vacuum pipeline and the vacuum tube, and the rubber base are combined into one piece through the supporting plate 2.

[0073] It should be noted that the device of the present application can integrate leak detection (i.e. sealing detection) and liquid injection workpiece, can inject liquid under vacuum condition, utilize the pressure difference between the material cup and the outside (the inside of the material cup and the inside of the battery shell are negative pressure), accelerate the liquid electrolyte, and at the same time, when leak detection (i.e. sealing detection) is performed, the battery shell inside the battery shell is removed, so that the electrolyte on the pole piece, the diaphragm is also fast, and the immersion effect is improved.

[0074] In the present application, the vacuumizing equipment (such as vacuum pump) is a mature product equipment in the prior art, and will not be repeated here. It should be noted that the vacuum pump is connected with the tool of the present application, and is used to draw negative pressure when leak detection is performed. At the same time, the vacuum pump can be connected with the sealed tank (i.e. pressure tank body) to draw negative pressure for the sealed tank.

[0075] In the present application, the electrolyte injection machine (i.e. electrolyte injection pump) is a mature product equipment in the prior art, and will not be repeated here. It should be noted that the electrolyte injection pump is connected with the injection needle 4 through the injection pipeline, and is used to extract the electrolyte from the external tank body storing the electrolyte, and is used to complete the injection function.

[0076] In order to more clearly understand the technical scheme of the present application, the working process of the present application will be described below in conjunction with the embodiments.

[0077] Embodiment 1.

[0078] The tool of the present application is used for leak detection and liquid injection process of large cylindrical battery. In the whole process, the following are needed: the cell (i.e. the battery shell has been loaded into the cell) has been loaded into the shell, the existing liquid injection machine (i.e. the liquid injection pump) and the existing vacuum pump.

[0079] Firstly, the rubber base 3 at the bottom of the support plate 2 is pressed and combined with the top surface of the upper pressing plate 102, and the lower end of the injection head 101 at the bottom of the material cup 1 is pressed and combined with the injection port at the top of the shell of the battery 6 (i.e. is pressed and connected); then, the injection needle 4 and the vacuum tube 5 enter the inside of the material cup 1 through the small holes (i.e. the third injection needle through hole and the third vacuum tube through hole) on the upper pressing plate 102, the depth of the material cup 1 is 20mm, the length of the injection needle 4 is 8mm, and the diameter of the injection needle is 5mm;

[0080] The length of the leak detection metal pipe (i.e. the vacuum tube 5) is 1.5mm, and the diameter is 5mm;

[0081] The leak detection metal pipe (i.e. the vacuum tube 5) and the injection needle 4 form a height difference, so that the electrolyte pollution of the leak detection metal pipe can be effectively reduced when the liquid is injected.

[0082] Second step, open the vacuum valve on the vacuum pipeline (i.e. open and close the valve), through the vacuum pump, the inner cavity of the cup 1 and the shell of the battery 6 are vacuumized, vacuumized to-95kpa, then the vacuum valve is closed and maintained for 15s, the vacuum degree of the shell of the battery 6 and the inner cavity of the cup 1 connected through the pressure gauge on the vacuum pipeline (i.e. vacuum pressure gauge) can be obtained, if the vacuum degree in the cup 1 is less than-80kpa, it is determined that the sealing performance of the battery 6 is qualified. Otherwise, it is determined that the sealing performance of the battery 6 is unqualified.

[0083] Third step, the battery cell with qualified sealing performance is injected, and the injection machine (i.e. injection pump) is controlled to inject electrolyte into the cup. After the injection is completed, the sealing detection operation and the injection operation of the battery 6 are completed.

[0084] After the sealing detection operation and the injection operation are completed, the support plate 2 and the various components (i.e. integrated tooling) mounted thereon are separated from the upper pressing plate 102, and then the above first step to third step can be repeatedly executed for a new battery 6, so as to complete the sealing detection operation and the injection operation of the new battery 6.

[0085] The above operations are repeatedly executed for a plurality of different batteries 6, so as to complete the sealing detection operation and the injection operation of the plurality of batteries.

[0086] It should be noted that after the injection, there is a pressure difference between the inside of the battery shell and the outside, and the electrolyte will enter the shell faster. In order to further make the electrolyte completely enter the battery shell, the tray on which the battery is placed can be further sent into the sealed tank (i.e. pressure tank body), and the sealed tank (i.e. pressure tank body) is subjected to vacuum and pressure cyclically for 3 times (each vacuum and pressure cyclic operation specifically includes: first, the inside of the sealed tank is vacuumized, the vacuum degree inside the sealed tank is-90kpa, and the duration is 60s, then the inside of the sealed tank is pressurized, the pressure of the pressurization is 550kpa, and the duration is 150s), so that the electrolyte in the cup 1 enters the shell of the battery completely,

[0087] It should be noted that before the first step, the battery 6 after the cell (i.e. pole group) enters the shell and the drying operation can be weighed by the electronic scale. After the above first step to third step operation is completed, the battery 6 after the injection can be weighed again. The difference between the two weights is the electrolyte injection amount in the battery 6. If the electrolyte injection amount in the battery 6 is less than the pre-required electrolyte injection amount, it is considered that the electrolyte injection amount in the battery 6 is unqualified. Otherwise, it is considered that the electrolyte injection amount in the battery 6 is qualified.

[0088] The qualified battery is transferred to the subsequent processing procedure, and the unqualified battery is treated by supplementing liquid or being discarded. The qualified battery is transferred to the subsequent processing procedure, and the unqualified battery is treated by supplementing liquid or being discarded.

[0089] Compared with the prior art, the battery liquid injection tool with the sealing detection function has the following beneficial effects:

[0090] For the utility model, by combining the leak detection pipe (namely the vacuum pipe) with the liquid injection needle, electrolyte can be injected into the battery shell under negative pressure of the material cup and the battery shell after leak detection (namely sealing detection), because there is a pressure difference between the material cup and the outside world, the electrolyte injected into the material cup is more likely to enter the battery shell, and the liquid injection efficiency is improved.

[0091] At the same time, when leak detection is performed, the pressure difference between the material cup and the outside world (the material cup inside and the battery shell inside are under negative pressure) is utilized to draw away the gas between the pole pieces in the battery shell, so that the wetting speed of the electrolyte on the pole pieces and the diaphragm is also fast, and the wetting effect is improved.

[0092] The above is only the preferred embodiment of the utility model, and it should be pointed out that for ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the principle of the utility model, and these improvements and refinements should also be regarded as the protection range of the utility model.

Claims

1. A battery filling fixture with a sealing test function, characterized in that, It comprises a material cup (1), a support plate (2), a liquid injection needle (4) and a vacuum tube (5); The hollow material cup (1) is provided with a horizontally distributed support plate (2) at the top; The top opening of the material cup (1) is provided with an upper pressing plate (102) in a sealing manner; The bottom of the support plate (2) is provided with a rubber base (3); The rubber base (3) is arranged on the top of the upper pressing plate (102); The support plate (2), the rubber base (3) and the upper pressing plate (102) are vertically and sealingly provided with a hollow liquid injection needle (4) and a hollow vacuum tube (5); The lower end of the liquid injection needle (4) and the vacuum tube (5) extends into the inner cavity of the material cup (1); The bottom of the material cup (1) is provided with a hollow liquid injection head (101); The upper end opening of the liquid injection head (101) is connected with the inner cavity of the material cup (1); The lower end of the liquid injection head (101) is sealingly connected with the top liquid injection port of the shell of the battery (6) which needs to be injected with electrolyte; The battery (6) is arranged on the top of a battery tray (7); The top end opening of the liquid injection needle (4) is connected with one end of a liquid injection pipeline; The vacuum tube (5) is connected with one end of a vacuum pipeline; The other end of the vacuum pipeline is connected with the air outlet of an external vacuum equipment; The other end of the liquid injection pipeline is connected with the liquid injection port of an external electrolyte injection machine.

2. The battery liquid injection tooling with a sealing detection function according to claim 1, wherein The support plate (2) is provided with a first liquid injection needle through hole and a first vacuum tube through hole; The rubber base (3) and the upper pressing plate (102) are respectively provided with a second liquid injection needle through hole and a third liquid injection needle through hole at positions corresponding to the first liquid injection needle through hole; The rubber base (3) and the upper pressing plate (102) are respectively provided with a second vacuum tube through hole and a third vacuum tube through hole at positions corresponding to the first vacuum tube through hole; The liquid injection needle (4) passes through the first liquid injection needle through hole, the second liquid injection needle through hole and the third liquid injection needle through hole in sequence from top to bottom; The vacuum tube (5) passes through the first vacuum tube through hole, the second vacuum tube through hole and the third vacuum tube through hole in sequence from top to bottom.

3. The battery liquid injection tooling with a sealing detection function according to claim 2, wherein The liquid injection needle (4) is in interference fit with the second liquid injection needle through hole and the third liquid injection needle through hole; The vacuum tube (5) is in interference fit with the second vacuum tube through hole and the third vacuum tube through hole.

4. The battery liquid injection tooling with a sealing detection function according to any one of claims 1 to 3, wherein The top of the battery tray (7) is provided with a cylindrical positioning groove; The lower end of the battery (6) is embedded in the positioning groove of the battery tray (7).

5. The battery liquid injection tool with a sealing detection function according to claim 1, wherein The shape of the liquid injection head (101) is hollow cylindrical, and both ends thereof are open.

6. The battery liquid injection tool with a sealing detection function according to claim 1, wherein The lower end of the liquid injection head (101) at the bottom of the material cup (1) is inserted into the top liquid injection port of the shell of the battery (6).

7. The battery liquid injection tool with a sealing detection function according to claim 1, wherein The vertical length of the liquid injection needle (4) is in the range of 2 / 5-1 / 2 of the vertical depth of the material cup (1); The vertical length of the vacuum tube (5) is in the range of 1 / 10-1 / 5 of the vertical depth of the material cup (1).

8. The battery liquid injection tool with a sealing detection function according to claim 1, wherein The bottom height of the liquid injection needle (4) is lower than that of the vacuum tube (5).

9. The battery liquid injection tooling with a sealing detection function according to any one of claims 1 to 8, wherein A vacuum valve and a pressure gauge are arranged on the vacuum pipeline.

10. The battery liquid injection tooling with a sealing detection function according to claim 9, wherein The pressure gauge is arranged on the vacuum pipeline between the vacuum valve and the vacuum tube (5).

Images