Secondary battery liquid injection nozzle and liquid injection device

Abstract

The utility model relates to the technical field of liquid injection devices, in particular to a secondary battery liquid injection nozzle and a liquid injection device.The secondary battery liquid injection nozzle comprises a shell sleeve and a liquid injection pipe, an opening is formed in the bottom of the shell sleeve, the liquid injection pipe and liquid absorption filler are arranged in the shell sleeve, and the liquid injection pipe is used for conducting negative pressure pumping on a secondary battery and injecting electrolyte; the liquid absorption filler is arranged between the liquid injection pipe and the shell sleeve, the lower end of the liquid absorption filler extends below the lower end face of the shell sleeve, the liquid absorption filler is used for absorbing residual electrolyte at a liquid injection port of the secondary battery, a suction cavity is formed in the shell wall of the shell sleeve, a suction hole is formed in the inner wall of the shell sleeve, and a negative pressure connecting port is formed in the outer wall of the shell sleeve. And electrolyte of the liquid absorption filler is sucked out through the suction hole, the suction cavity and the negative pressure connecting port in sequence. According to the utility model, the problems of explosion points caused by foreign matters in laser welding of the liquid injection port and blockage of the liquid injection pipe and the liquid absorption filler caused by separation and crystallization of the electrolyte can be solved, and the production stability is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid injection device technical field, concretely relates to a secondary battery liquid injection nozzle and liquid injection device. BACKGROUND

[0002] With the development of battery industry, the degree of automation is higher and higher, and the battery production line capacity increases, at this time, the battery manufacturing process has a great influence on manufacturing efficiency. After the battery is baked, electrolyte needs to be injected, at this time, the electrolyte needs to meet the requirements of infiltrating the battery internal roll core as much as possible, so that the next step of formation can be better carried out.

[0003] The Chinese invention patent application with the application publication number CN118888883A discloses a battery formation floating suction nozzle needle matching structure, which makes the negative pressure rod self-correct the deviation when deviating from the battery liquid injection port through the guide sleeve with a guide shape, completes the butt joint under the premise of avoiding the hard contact between the negative pressure suction nozzle head and the battery liquid injection port, and reduces the risk of battery damage and liquid leakage. However, in actual production, due to problems such as battery pole piece design, the electrolyte cannot quickly infiltrate the pole piece, causing insufficient space and liquid overflow or residual liquid from the liquid injection head dropping on the liquid injection port. At this time, the electrolyte on the liquid injection port may crystallize after formation and liquid supplement due to evaporation, resulting in welding defects such as burst points during laser welding of the liquid injection port. At present, the above problems can be solved by manual wiping or plasma cleaning after machine recognition, but in the production line with high automation degree, the wiping speed of workers cannot meet the requirements; plasma cleaning requires additional purchase of equipment and increase of production cost. SUMMARY

[0004] The utility model aims at the defects of the prior art, and provides a secondary battery liquid injection nozzle and liquid injection device, which can improve the problems of burst points caused by foreign matters in laser welding of the liquid injection port and blockage of the liquid injection pipe and the liquid suction filler caused by electrolyte crystallization, thereby greatly improving the production stability and reducing the workload of personnel maintenance.

[0005] In order to solve the above technical problems, in the first aspect, the utility model provides a secondary battery liquid injection nozzle, which comprises a shell sleeve, an opening is arranged at the bottom of the shell sleeve, a liquid injection pipe and a liquid suction filler are arranged in the shell sleeve, the liquid injection pipe is used for negative pressure extraction and injection of electrolyte for the secondary battery, the liquid suction filler is arranged between the liquid injection pipe and the shell sleeve, the lower end of the liquid suction filler extends below the lower end face of the shell sleeve, the liquid suction filler is used for absorbing residual electrolyte at the liquid injection port of the secondary battery, a suction cavity is arranged in the shell wall of the shell sleeve, a suction hole is arranged on the inner wall of the shell sleeve, and a negative pressure connection port is arranged on the outer wall of the shell sleeve. The electrolyte of the liquid suction filler is sequentially sucked out through the suction hole, the suction cavity and the negative pressure connection port.

[0006] In some embodiments, the liquid injection pipe is in sliding sealing connection with the top of the shell sleeve.

[0007] In some embodiments, a limiting ring and a spring are arranged on the liquid injection pipe, the limiting ring and the spring are arranged above the shell sleeve, one end of the spring abuts against the limiting ring, the other end of the spring is connected with the shell sleeve, and the lower end of the liquid injection pipe is retracted into the shell sleeve under the action of the spring.

[0008] In some embodiments, the negative pressure connection port is arranged at a position close to the lower end of the outer wall of the shell sleeve.

[0009] In some embodiments, the suction holes are uniformly arranged along the height direction of the shell sleeve.

[0010] In some embodiments, a cooling jacket is arranged on the outer wall of the shell sleeve, and the cooling jacket is used for cooling the liquid injection nozzle of the secondary battery.

[0011] In some embodiments, the cooling jacket is provided with a water inlet and a water outlet, the water inlet is arranged at the bottom of the cooling jacket, and the water outlet is arranged at the top of the cooling jacket.

[0012] In the second aspect, the utility model provides a kind of liquid injection device, including hollow pressure rod, the lower end of the hollow pressure rod is connected with the upper end of the liquid injection pipe, the upper end of the hollow pressure rod is connected with driving mechanism, and the driving mechanism is used to butt the lower end of the liquid injection pipe with the liquid injection port of the secondary battery simultaneously, and the shell sleeve is placed at the liquid injection port of the secondary battery.

[0013] In some embodiments, a injection frame is included, a through hole is arranged in the injection frame, the shell sleeve is in sliding connection with the lower end of the through hole, and the lower end of the hollow pressure rod is inserted into the through hole and connected with the upper end of the liquid injection pipe.

[0014] In some embodiments, the driving mechanism is fixedly arranged on the injection frame.

[0015] The utility model has the following beneficial effects:

[0016] 1. The liquid suction filler of the utility model can absorb residual electrolyte on the liquid injection port of the secondary battery, improve the problem of explosion point caused by foreign matter in laser welding of the liquid injection port, and simultaneously, by arranging the suction hole, the suction cavity and the negative pressure connection port, the electrolyte in the liquid suction filler can be sucked out, so that the liquid suction filler can be repeatedly used.

[0017] 2. The lower end of the liquid injection pipe of the utility model can be retracted into the shell sleeve, so that residual electrolyte on the liquid injection pipe can also be absorbed by the liquid suction filler, to avoid blockage of the liquid injection pipe and affect the liquid injection efficiency.

[0018] 3. The utility model discloses a spring is provided, make with the injection liquid pipe and the injection liquid mouth of secondary battery butt joint, under the action of spring, liquid suction filler is automatically pressed at the injection liquid mouth of secondary battery.

[0019] 4. The utility model discloses a cooling jacket is set up, can guarantee injection liquid pipe and liquid suction filler keep low temperature, reduce electrolyte volatilization rate, can effectively improve the problem that electrolyte precipitates crystallization leads to injection liquid pipe and liquid suction filler block, thereby greatly improve production stability, reduce the workload of personnel maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the structure schematic drawing of the utility model injection liquid nozzle initial state;

[0021] Figure 2 It is the structure schematic drawing of the utility model injection liquid nozzle injection.

[0022] Reference Signs: 1-injection liquid pipe;2-spring;3-liquid suction filler;4-outer shell cover;5-negative pressure connecting port;6-cooling jacket;7-water inlet;8-water outlet;9-suction hole;10-suction cavity. DETAILED DESCRIPTION

[0023] In order to make the technical problem of the present application, technical scheme and beneficial effect more clearly, the following combining with the embodiment, the present application is further detailed. It should be understood that the specific embodiments described here are only used to explain the present application, and are not used to limit the present application.

[0024] As Figure 1 The utility model discloses a secondary battery injection liquid nozzle, including outer shell cover 4, the bottom of outer shell cover 4 sets up the opening, i. e. the blind hole is seted up in the outer shell cover 4, and the opening of blind hole is downward, and the injection liquid pipe 1 and liquid suction filler 3 are arranged in the outer shell cover 4, and the injection liquid pipe 1 is used to carry out the negative pressure of secondary battery and injects electrolyte, and the liquid suction filler 3 is arranged between the injection liquid pipe 1 and the outer shell cover 4, and the lower end of liquid suction filler 3 extends to below the lower end surface of outer shell cover 4, and the liquid suction filler 3 is used to absorb the electrolyte remaining at the injection liquid mouth of secondary battery, and the suction cavity 10 is seted up in the shell wall of outer shell cover 4, and the suction hole 9 is seted up on the inner wall of outer shell cover 4, and the negative pressure connecting port 5 is seted up on the outer wall of outer shell cover 4, and the electrolyte of liquid suction filler 3 is sucked out in turn through suction hole 9, suction cavity 10 and negative pressure connecting port 5. Wherein, the liquid suction filler 3 is the porous columnar structure, and the material quality can be cloth or sponge or porous ceramic compound.

[0025] It can be understood that, since the lower end of the liquid absorbing filler 3 extends below the lower end surface of the shell sleeve 4, when the shell sleeve 4 is pressed at the liquid injection port of the secondary battery, the liquid absorbing filler 3 will wrap the liquid injection port of the secondary battery, and the electrolyte seeping from the liquid injection port can be quickly absorbed by the liquid absorbing filler 3, thereby improving the problem of explosion point caused by foreign matter in laser welding of the liquid injection port, and in addition, by arranging the suction hole 9, the suction cavity 10, and the negative pressure connection port 5, and connecting the negative pressure device with the negative pressure connection port 5, the electrolyte in the liquid absorbing filler 3 can be sucked out, so that the liquid absorbing filler 3 can repeatedly absorb the electrolyte.

[0026] In some embodiments, the liquid injection pipe 1 is in sliding sealing connection with the top of the shell sleeve 4.

[0027] It should be noted that, in the case of shift handover of the liquid injection production line, suspension of the product liquid injection process, and the like, the liquid injection equipment will stop working, at this time, the electrolyte remaining on the liquid injection nozzle will cause EC or lithium to precipitate due to volatilization, resulting in crystallization and blockage of the liquid injection nozzle, affecting the liquid injection efficiency. The lower end of the liquid injection pipe 1 of the utility model can be retracted into the shell sleeve 4, so that the electrolyte remaining on the liquid injection pipe 1 can also be absorbed by the liquid absorbing filler 3, avoiding blockage of the liquid injection pipe 1 and affecting the liquid injection efficiency.

[0028] In some embodiments, as shown in Figure 1 , 2 , a limiting ring and a spring 2 are arranged on the liquid injection pipe 1, both the limiting ring and the spring 2 are arranged above the shell sleeve 4, one end of the spring 2 abuts against the limiting ring, and the other end of the spring 2 is connected with the shell sleeve 4, under the action of the spring 2, the lower end of the liquid injection pipe 1 will retract into the shell sleeve 4.

[0029] The utility model sets the spring 2, so that when the liquid injection pipe 1 is connected with the liquid injection port of the secondary battery, the liquid absorbing filler 3 is automatically pressed at the liquid injection port of the secondary battery under the action of the spring 2. And, since the spring 2 is arranged, after the liquid injection is completed, the lower end of the liquid injection pipe 1 can automatically retract into the shell sleeve 4, so that the electrolyte remaining on the liquid injection pipe 1 is absorbed by the liquid absorbing filler 3.

[0030] In some embodiments, the negative pressure connection port 5 is arranged at a position close to the lower end of the outer wall of the shell sleeve 4. As much as possible, it is ensured that the seeping electrolyte can be discharged.

[0031] In some embodiments, the suction holes 9 are uniformly arranged along the height direction of the shell sleeve 4.

[0032] In some embodiments, as shown in Figure 1 , a cooling jacket 6 is sleeved on the outer wall of the shell sleeve 4, and the cooling jacket 6 is used for cooling the liquid injection nozzle of the secondary battery.

[0033] Since the electrolyte exists in the liquid injection pipe 1 and the liquid absorbing filler 3, the electrolyte volatilization is easy to cause the liquid injection pipe 1 and the liquid absorbing filler 3 to be blocked, the liquid injection pipe 1 and the liquid absorbing filler 3 are cooled by using the cooling jacket 6, the electrolyte volatilization rate is reduced, the problem that the electrolyte precipitation crystallization causes the liquid injection pipe 1 and the liquid absorbing filler 3 to be blocked can be effectively improved, and therefore the production stability is greatly improved and the workload of personnel maintenance is reduced.

[0034] In some embodiments, the cooling jacket 6 is provided with a water inlet 7 and a water outlet 8, the water inlet 7 is arranged at the bottom of the cooling jacket 6, and the water outlet 8 is arranged at the top of the cooling jacket 6. The cooling liquid enters from the bottom of the cooling jacket 6 and flows out from the top, which is beneficial to improve the cooling effect of the cooling liquid, and the electrolyte at the lower end of the liquid absorbing filler 3 is more, the electrolyte at the lower end of the liquid injection pipe 1 is more easy to volatilize, and more cooling is needed.

[0035] In the second aspect, the utility model provides a kind of liquid injection device, including hollow pressure rod, the lower end of hollow pressure rod is connected with the upper end of liquid injection pipe 1, and the upper end of hollow pressure rod is connected with driving mechanism, and driving mechanism is used to the lower end of liquid injection pipe 1 with secondary battery liquid injection port is docked while, with shell cover 4 is placed at secondary battery liquid injection port.

[0036] It can be understood that the driving mechanism can be a motor, a pneumatic cylinder or a hydraulic cylinder, etc., the hollow pressure rod is pressed down by the driving mechanism, and the liquid injection pipe 1 is pressed down and docked with the liquid injection port of the secondary battery by the hollow pressure rod. Due to the action of the spring 2, the shell cover 4 will also be placed at the liquid injection port of the secondary battery, so that the liquid absorbing filler 3 is automatically pressed at the liquid injection port of the secondary battery. The electrolyte can be injected into the liquid injection pipe 1 through the hollow pressure rod.

[0037] In some embodiments, a injection frame is included, a through hole is formed in the injection frame, the shell cover 4 is slidably connected with the lower end of the through hole, and the lower end of the hollow pressure rod is inserted into the through hole and connected with the upper end of the liquid injection pipe 1. By providing the injection frame, the stability of the movement of the shell cover 4 can be ensured.

[0038] In some embodiments, the driving mechanism is fixedly arranged on the injection frame.

[0039] The use method of the liquid injection device is as follows:

[0040] Position and match the liquid injection nozzle with the liquid injection port of the secondary battery;

[0041] Press down the liquid injection nozzle, the liquid injection pipe 1 is docked with the liquid injection port of the secondary battery, at this time, the spring 2 is compressed, and the liquid absorbing filler 3 is squeezed and tightly contacted with the liquid injection port of the secondary battery, as shown in Figure 2

[0042] ​According to the liquid injection process setting steps, the secondary battery is subjected to negative pressure extraction and injection of electrolyte with a set quality. If necessary, the negative pressure extraction and multiple small volume injection cycle operations can be repeated to ensure that the designed electrolyte can be accommodated by the battery. The negative pressure extraction is performed by the circulation of the injection pipe 1 and the vacuum cup in the injection device;

[0043] Partially lifting the liquid injection nozzle, the liquid injection nozzle is slightly lifted, the lower end of the injection pipe 1 is retracted into the shell sleeve 4, the residual electrolyte in the nozzle of the injection pipe 1 is absorbed by the filler, at this time the liquid absorbing filler 3 and the liquid injection port of the secondary battery still maintain close contact, the electrolyte absorbed by the liquid absorbing filler 3 is extracted through the suction hole 9 and the suction cavity 10 by using the negative pressure device;

[0044] Lifting the liquid injection nozzle and positioning the next batch of batteries, the above steps are repeated to complete continuous production;

[0045] Low temperature maintenance: if the machine stops, open the cooling water, the cooling water enters the cooling jacket 6 through the water inlet 7 and is discharged through the water outlet 8 to complete the circulation, maintaining the low temperature environment of the liquid injection nozzle, reducing the evaporation rate of the electrolyte; the cooling water temperature is controlled between 4-15℃.

[0046] The above-described embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A liquid injection nozzle for a secondary battery, characterized by: The shell sleeve (4) is provided with an opening at the bottom, and the shell sleeve (4) is provided with a liquid injection pipe (1) and a liquid suction filler (3) inside, the liquid injection pipe (1) is used for negative pressure extraction and electrolyte injection of the secondary battery, the liquid suction filler (3) is arranged between the liquid injection pipe (1) and the shell sleeve (4), the lower end of the liquid suction filler (3) extends below the lower end face of the shell sleeve (4), the liquid suction filler (3) is used for absorbing residual electrolyte at the liquid injection port of the secondary battery, a suction cavity (10) is arranged in the shell wall of the shell sleeve (4), a suction hole (9) is arranged on the inner wall of the shell sleeve (4), and a negative pressure connection port (5) is arranged on the outer wall of the shell sleeve (4); the electrolyte of the liquid suction filler (3) is sequentially sucked out through the suction hole (9), the suction cavity (10) and the negative pressure connection port (5).

2. The secondary battery filling nozzle according to claim 1, characterized by: The liquid injection pipe (1) is in sliding sealing connection with the top of the shell sleeve (4).

3. The secondary battery filling nozzle according to claim 2, characterized by: A limiting ring and a spring (2) are arranged on the liquid injection pipe (1), the limiting ring and the spring (2) are arranged above the shell sleeve (4), one end of the spring (2) abuts against the limiting ring, the other end of the spring (2) is connected with the shell sleeve (4), and the lower end of the liquid injection pipe (1) is retracted into the shell sleeve (4) under the action of the spring (2).

4. The secondary battery filling nozzle according to any one of claims 1 to 3, characterized by: The negative pressure connection port (5) is arranged at a position close to the lower end of the outer wall of the shell sleeve (4).

5. The secondary battery filling nozzle according to any one of claims 1 to 3, characterized by: The suction holes (9) are uniformly arranged along the height direction of the shell sleeve (4).

6. The secondary battery filling nozzle according to any one of claims 1 to 3, characterized by: A cooling jacket (6) is arranged on the outer wall of the shell sleeve (4), and the cooling jacket (6) is used for cooling the liquid injection nozzle of the secondary battery.

7. The secondary battery filling nozzle according to claim 6, characterized by: The cooling jacket (6) is provided with a water inlet (7) and a water outlet (8), the water inlet (7) is arranged at the bottom of the cooling jacket (6), and the water outlet (8) is arranged at the top of the cooling jacket (6).

8. A liquid injection apparatus of a liquid injection nozzle of a secondary battery according to any one of claims 1 to 7, characterized by: A hollow pressing rod is arranged, the lower end of the hollow pressing rod is connected with the upper end of the liquid injection pipe (1), the upper end of the hollow pressing rod is connected with a driving mechanism, the driving mechanism is used for abutting the shell sleeve (4) against the liquid injection port of the secondary battery while abutting the lower end of the liquid injection pipe (1) with the liquid injection port of the secondary battery.

9. The liquid injection device according to claim 8, wherein: An injection frame is arranged, a through hole is arranged in the injection frame, the shell sleeve (4) is in sliding connection with the lower end of the through hole, and the lower end of the hollow pressing rod is inserted into the through hole and connected with the upper end of the liquid injection pipe (1).

10. The liquid injection device according to claim 9, wherein: The driving mechanism is fixedly arranged on the injection frame.

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