CN217405662U

CN217405662U - Lithium battery liquid injection device

Info

Publication number: CN217405662U
Application number: CN202220814640.6U
Authority: CN
Inventors: 陈慕天; 李核志; 蒋浩
Original assignee: Sany Technology Equipment Co Ltd
Current assignee: Sany Technology Equipment Co Ltd
Priority date: 2022-04-07
Filing date: 2022-04-07
Publication date: 2022-09-09
Anticipated expiration: 2032-04-07

Abstract

The utility model provides a lithium battery liquid injection device. Lithium battery priming device includes: the quantitative cups are sequentially arranged at intervals and are provided with liquid inlets, overflow ports and liquid outlets, and the liquid outlets are suitable for filling liquid into lithium batteries corresponding to the quantitative cups one to one; and the circulating liquid supply system is connected with the liquid inlet and the overflow port, so that the circulating liquid supply system supplies liquid to the plurality of quantitative cups through at least one liquid inlet and returns the liquid through at least one overflow port. This lithium battery priming device pours into electrolyte into to a plurality of quantitative cups excessively through circulation liquid supply system, can guarantee that the electrolyte in every quantitative cup is full, and the volume of the electrolyte in every quantitative cup is unanimous, and the electrolyte that also pours into every lithium cell is unanimous, and simple structure easily realizes.

Description

Lithium battery liquid injection device

Technical Field

The utility model relates to a lithium cell technical field, concretely relates to lithium cell priming device.

Background

Lithium batteries are batteries using a nonaqueous electrolyte solution, which uses lithium metal or lithium alloy as a positive electrode material and a negative electrode material. Lithium batteries can be broadly classified into two types: lithium metal batteries and lithium ion batteries, wherein the lithium ion batteries are rechargeable.

The lithium cell needs to fill electrolyte in inside in process of production, and some lithium cells annotate the liquid volume great, and more high to efficiency requirement. In order to meet the requirements, some need dispose a plurality of liquid injection pumps and adopt high accuracy ceramic pump to annotate liquid when the design, and some adopt a plurality of quantitative jars to annotate liquid.

No matter a plurality of liquid injection pumps and high-precision ceramic pumps with limited discharge capacity or a plurality of quantitative cylinders are adopted, the consistency of the liquid injection quantity of each lithium battery cannot be ensured.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the technical defect that the unable assurance that exists keeps unanimity to the notes liquid volume of every battery among the prior art to a lithium cell priming device is provided.

In order to solve the above problem, the utility model provides a lithium battery liquid injection device, include: the quantitative cups are sequentially arranged at intervals and are provided with liquid inlets, overflow ports and liquid outlets, and the liquid outlets are suitable for filling liquid into lithium batteries corresponding to the quantitative cups one to one; and the circulating liquid supply system is connected with the liquid inlet and the overflow port, so that the circulating liquid supply system supplies liquid to the plurality of quantitative cups through at least one liquid inlet and returns liquid through at least one overflow port.

The application provides a lithium battery liquid injection device excessively pours into electrolyte into in to a plurality of quantitative cups through circulation liquid supply system, can guarantee that the electrolyte in every quantitative cup is full, and the volume of the electrolyte in every quantitative cup is unanimous, and the electrolyte that also pours into every lithium cell is unanimous, and simple structure, easily realization.

Preferably, the circulating liquid supply system comprises: the liquid storage tank is provided with a liquid outlet and a liquid return port; the hydraulic pipeline supplies the liquid pipeline, with the liquid outlet, return the liquid mouth, be located the difference the ration cup go into the liquid mouth with the overflow mouth is connected, makes circulation feed liquid system pass through one go into the liquid mouth in proper order to a plurality of ration cup supplies liquid and through one the overflow mouth is to liquid storage pot returns the liquid.

Preferably, the liquid supply line includes: the infusion mechanism is connected with the liquid outlet; an overflow pipe, one end of which is connected to the liquid inlet of one of the dosing cups and the other end of which is connected to the overflow port of the other adjacent dosing cup; one end of the liquid return pipe is connected with the liquid return port; the liquid inlet which is not connected with the overflow pipe is connected with the output port of the transfusion mechanism, and a liquid level meter is arranged in the overflow port which is not connected with the overflow pipe and is connected with the other end of the liquid return pipe.

Preferably, the overflow port is arranged at the top of the quantitative cup, and the liquid outlet is arranged at the bottom of the quantitative cup.

Preferably, the lithium battery liquid injection device further comprises: and the pressurizing system is connected with at least one liquid inlet.

Preferably, the lithium battery liquid injection device further comprises: the buffer cups are in one-to-one correspondence with the quantitative cups and are provided with liquid inlets and liquid injection ports, the liquid inlets are connected with the liquid outlets, and the liquid injection ports are connected with the liquid injection ports of the lithium batteries; a jacking mechanism; the lithium battery is arranged on the jacking mechanism, and the jacking mechanism is suitable for driving the cache cup to enable the liquid inlet and the liquid outlet to be connected or separated.

Preferably, the jacking mechanism comprises: a telescopic part; a top plate connected to the telescopic part; wherein the lithium battery is disposed on the top plate.

Preferably, the buffer cup has an inner bottom wall inclined from an inner side wall of the buffer cup to the pouring port.

Preferably, the lithium battery electrolyte injection device further comprises: the vacuumizing device is provided with a vacuumizing pipeline; the buffer memory cup is provided with an air outlet, the air outlet is connected with the vacuumizing pipeline, and the liquid injection port is hermetically connected with a liquid filling port of the lithium battery.

Preferably, the liquid injection port and the liquid outlet are respectively connected with a liquid injection nozzle.

The utility model has the advantages of it is following:

1. the quantitative cups are subjected to over-filling by the circulating liquid supply system, so that the consistency of the electrolyte in the quantitative cups can be ensured;

2. positive pressure is applied to the quantitative cup through a pressurizing system, so that the speed of the electrolyte flowing out of the quantitative cup can be accelerated, and the electrolyte completely flows out of the quantitative cup;

3. the lithium battery and the cache cup are driven by the jacking mechanism to be separated from or combined with the quantifying cup, so that the efficiency can be improved;

4. the electrolyte can be sucked into the buffer cup by a vacuumizing device.

5. The liquid storage of a plurality of quantitative cups can be realized only by adopting one set of liquid conveying system, namely a circulating liquid supply system, and the liquid conveying system can adopt a common liquid conveying device with larger discharge capacity, so that the cost is low and the efficiency is high.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following descriptions are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a lithium battery electrolyte injection device according to an embodiment;

fig. 2 is a schematic diagram of a lithium battery liquid injection device in another embodiment.

Description of reference numerals:

100. a lithium battery liquid injection device; 110. a dosing cup; 111. a liquid inlet; 113. an overflow port; 115. a liquid outlet; 120. a circulating liquid supply system; 121. a liquid storage tank; 1211. a liquid outlet; 1213. a liquid return port; 123. a liquid supply line; 1231. a transfusion mechanism; 1233. an overflow pipe; 1235. a liquid return pipe; 130. A pressurized system; 140. caching a cup; 141. a liquid inlet; 143. a liquid injection port; 145. an inner bottom wall; 147. An air outlet; 150. a jacking mechanism; 151. a telescopic part; 153. a top plate; 160. a vacuum pumping device; 161. a vacuum pumping pipeline; 170. and a liquid injection nozzle.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Summary of the application

At present, the liquid injection amount of a square power battery in a lithium battery is large, the requirement on efficiency is higher and higher, a plurality of liquid injection pumps need to be configured during design for meeting the requirement, and the cost is high. And the requirement of ensuring the consistent liquid injection amount of each battery when one-time liquid injection is required to be met, wherein the precision requirement is 1%. Although the precision requirement can be theoretically met by adopting the high-precision ceramic pump for liquid injection, because one ceramic pump is required to be calculated to correspond to one battery or a plurality of batteries according to the liquid injection amount and the time sequence requirement, the liquid injection precision of the batteries is actually controlled through the precision of the ceramic pump, and the liquid injection precision of the batteries is limited by a plurality of conditions. In addition, since the ceramic pump has a limited pump displacement, it is often necessary to configure a plurality of pumps to meet the efficiency requirement, which is costly. And the quantitative cylinder is adopted for liquid injection, and each intermediate storage cylinder needs to be provided with a piston rod, so that the structure is complex and the cost is high.

Exemplary lithium battery liquid injection device

Fig. 1 is a schematic diagram of a lithium battery electrolyte injection device in an embodiment, in which a lithium battery electrolyte injection device 100 includes: the liquid circulating system 120 and the plurality of dosing cups 110 may be fixed to a bottom plate, and the fixing manner is not limited, so long as it is ensured that the dosing cups 110 do not move when electrolyte is injected into the dosing cups 110. The plurality of dosing cups 110 are sequentially arranged at intervals, the dosing cups 110 are provided with liquid inlets 111, overflow ports 113 and liquid outlets 115, and the liquid outlets 115 are suitable for filling the lithium batteries 200 corresponding to the dosing cups 110 one by one. Each of the quantitative cups 110 corresponds to one lithium battery 200, that is, each of the quantitative cups 110 injects electrolyte into one lithium battery 200. The circulating liquid supply system 120 is connected with the liquid inlets 111 and the overflow outlets 113, so that the circulating liquid supply system 120 supplies liquid to the plurality of dosing cups 110 through at least one liquid inlet 111 and returns liquid through at least one overflow outlet 113.

The above-mentioned circulation feed liquid system 120 uses with a plurality of ration cups 110 cooperation, and electrolyte is poured into to ration cup 110 through the income liquid mouth 111 of ration cup 110 into to circulation feed liquid system 120, and circulation feed liquid system 120 is equipped with check valve and control valve on the pipeline that leads to at least one income liquid mouth 111, and the control valve is used for controlling the switching of this pipeline, and the check valve makes electrolyte can only flow to income liquid mouth 111 from circulation feed liquid system. When the electrolyte in the measuring cup 110 is excessive, the electrolyte can flow back to the circulating liquid supply system 120 through the overflow port 113, and no waste is generated. The circulating liquid supply system 120 can independently supply liquid through each liquid inlet 111, and the overflow port 113 independently returns liquid. Alternatively, the circulation liquid supply system 120 can feed liquid through one liquid inlet 111, and a plurality of dosing cups 110 are connected in series, wherein one overflow port 113 returns liquid. When the overflow port 113 detects a liquid level, it indicates that the electrolyte in the measuring cup 110 is full. Because the volume of the quantitative cup 110 is fixed, when all overflow ports detect the liquid level, all the quantitative cups 110 are full of electrolyte, so that the quantitative cup structure is adopted, the electrolyte injected into the battery is ensured to be consistent through the quantitative cups, the excessive liquid injection is adopted, the electrolyte in each quantitative cup 110 is ensured to be full, the electrolyte in each quantitative cup 110 is ensured to be consistent, that is, the electrolyte injected into each lithium battery 200 is consistent, the structure is simple, and the realization is easy.

Specifically, and with continued reference to FIG. 1, the circulating liquid supply system 120 includes: a liquid storage tank 121 and a liquid supply pipeline 123, the liquid storage tank 121 is provided with a liquid outlet 1211 and a liquid return port 1213, and the liquid storage tank 121 is used for storing electrolyte. The liquid supply pipeline 123 is connected with the liquid outlet 1211, the liquid return port 1213, the liquid inlets 111 and the overflow ports 113 of different quantitative cups 110, so that the circulating liquid supply system 120 sequentially supplies liquid to the quantitative cups 110 through one liquid inlet 111 and returns the liquid to the liquid storage tank 121 through one overflow port 113.

It can be understood that when the circulating liquid supply system 120 injects electrolyte into the corresponding quantitative cup 110 through one liquid inlet 111, since the quantitative cup 110 is provided with the overflow port 113, when the quantitative cup 110 is filled with electrolyte, the electrolyte can flow out into another quantitative cup 110 through the overflow port 113, and thus, a plurality of quantitative cups 110 can be filled with electrolyte in sequence. When the electrolyte in one of the quantitative cups 110 flows out through the overflow port 113, it is determined that the overflow port 113 can detect the liquid level, that is, the electrolyte in the quantitative cup 110 is full. When the plurality of measuring cups 110 are filled in sequence, the overflow port 113 of the last measuring cup 110 filled with the electrolyte may flow back to the liquid supply line 123.

More specifically, as shown in continued reference to fig. 1, the liquid supply line 123 includes: the infusion mechanism 1231, the overflow pipe 1233, and the liquid return pipe 1235 is provided with a control valve. The liquid supply mechanism 1231 is connected to the liquid outlet 1211 such that the liquid supply mechanism 1231 can supply the electrolyte flowing out of the liquid outlet 1211 to the inlet 111 of the fixed quantity cup 110. The fluid infusion mechanism 1231 may be a hydraulic pump or a pressure pipeline, and an inlet of the hydraulic pump or the pressure pipeline is connected to the liquid outlet 1211 of the fluid reservoir 121, which is not limited in this embodiment.

More specifically, as shown in fig. 1, one end of the overflow pipe 1233 is connected to the liquid inlet 111 of one of the quantitative cups 110, and the other end of the overflow pipe 1233 is connected to the overflow port 113 of another adjacent quantitative cup 110, that is, two ends of the overflow pipe 1233 are connected to different quantitative cups 110, and the position of the overflow pipe 1233 is higher than the position of the overflow port 113, so that the electrolyte in one quantitative cup 110 flows into another quantitative cup 110 through the overflow port 113 and the overflow pipe 1233, and thus the liquid can be sequentially filled into a plurality of quantitative cups 110 by the circulating liquid supply system. One end of the liquid return pipe 1235 is connected to the liquid return port 1213, so that the electrolyte flowing out of one of the overflow ports 113 can flow back to the liquid reservoir 121 through the liquid return pipe 1235. The inlet 111 not connected to the overflow pipe 1233 is connected to the outlet of the infusion mechanism 1231, and the overflow port 113 not connected to the overflow pipe 1233 is provided therein with a level gauge and connected to the other end of the liquid return pipe 1235. The liquid level meter in the overflow port 113 connected to the liquid return pipe 1235 may be separately set, or may be set in a control valve provided at the overflow port 113, which are all the prior art and will not be described herein again.

More specifically, as shown in fig. 1, the overflow port 113 is disposed at the top of the quantitative cup 110, so that the electrolyte can flow out through the overflow port 113 after being filled with the electrolyte, and the liquid outlet 115 is disposed at the bottom of the quantitative cup 110, so that the electrolyte in the quantitative cup 110 can be completely filled into the lithium battery 200 under the action of gravity.

Specifically, with continuing reference to fig. 1, the lithium battery electrolyte injection device 100 further includes: and the pressurizing system 130, wherein the pressurizing system 130 is connected with at least one liquid inlet 111. Wherein, the liquid feeding pipeline from the liquid feeding mechanism 1231 of the circulating liquid feeding system 120 to the liquid inlet 111 is provided with a control valve, and the gas input pipeline of the pressurization system 130 is connected to the pipeline between the outlet of the control valve and the liquid inlet 111. After closing this control valve, can not influence pressurization system 130 and to the gas that has certain pressure of inputing in the ration cup 110, adopt compressed air pressurization, can accelerate the speed that electrolyte flows out ration cup 110, and can guarantee that electrolyte can all flow out from the ration cup 110 to can further guarantee the uniformity of annotating liquid of every lithium cell 200, and improve lithium cell 200's notes liquid efficiency. A control valve is also provided in a pipe between the pressurizing system 130 and the liquid inlet 111. The control valve is generally of a conventional design and will not be described further herein.

As shown in fig. 2, the lithium battery electrolyte injection device 100 further includes: a plurality of cache cups 140 and a jacking mechanism 150. The plurality of buffer cups 140 correspond to the plurality of dosing cups 110 one by one, the buffer cups 140 are provided with liquid inlets 141 and liquid injection ports 143, the liquid inlets 141 are connected with the liquid outlets 115, and the liquid injection ports 143 are connected with liquid injection ports of the lithium batteries 200. The lithium battery 200 is disposed on the jacking mechanism 150, and the jacking mechanism 150 is adapted to drive the buffer cup 140 to connect or disconnect the liquid inlet 141 and the liquid outlet 115.

The lithium battery 200 is connected to the buffer cup 140, and the buffer cup 140 is used for buffering the electrolyte injected from the dosing cup 110. Specifically, the jacking mechanism 150 can jack the lithium battery 200 and the buffer cup 140. When the jacking mechanism 150 jacks up the lithium battery 200 and the buffer cup 140, the liquid inlet 141 of the buffer cup 140 is connected with the liquid outlet 115 of the dosing cup 110, the control valve arranged on the pipeline between the liquid inlet 141 and the liquid outlet 115 is opened, and the electrolyte enters the buffer cup 140 and the lithium battery 200 from the dosing cup 110. Undetermined measuring cup 110's liquid is whole to be flowed out, then control climbing mechanism 150 drives the height decline of lithium cell 200 and buffer memory cup 140 to make inlet 141 and liquid outlet 115 alternate segregation, can conveniently transport lithium cell 200 and buffer memory cup 140 to the station of stewing together this moment and stew, annotate liquid to other lithium cell 200 again, stew together along with lithium cell 200 when buffer memory cup 140, can raise the efficiency.

Specifically, as shown in fig. 2, the jacking mechanism 150 includes a telescopic part 151 and a top plate 153, for example, the jacking mechanism 150 may be a hydraulic cylinder or an air cylinder, and the telescopic part 151 is a telescopic rod. The top plate 153 is connected to the bellows 151 such that the top plate 153 and the bellows 151 can be simultaneously extended or retracted. The lithium battery 200 is disposed on the top plate 153, and the lifting mechanism 150 drives the buffer cup 140 through the telescopic portion 151 so that the liquid inlet 141 is connected to or separated from the liquid outlet 115.

When the telescopic part 151 is extended, the liquid inlet 141 of the buffer cup 140 is connected to the liquid outlet 115 of the fixed amount cup 110. And if all the liquid in the cup 110 to be measured flows out, the telescopic part 151 is controlled to retract, so that the telescopic part 151 drives the top plate, the lithium battery 200 and the buffer cup 140 to be lowered.

More specifically, as shown in fig. 2, the buffer cup 140 has an inner bottom wall 145 inclined from the inner side wall of the buffer cup 140 to the pouring port 143, and the inner bottom wall 145 inclined from top to bottom in use can guide the electrolyte, thereby further increasing the speed of the electrolyte flowing out of the buffer cup 140.

Specifically, with reference to fig. 2, the lithium battery electrolyte injection device 100 further includes: the vacuum-pumping device 160, the vacuum-pumping device 160 has a vacuum-pumping pipeline 161. The buffer cup 140 has an air outlet 147, the air outlet 147 is connected to the vacuum pumping pipeline 161, and the liquid filling port 143 is hermetically connected to the liquid filling port of the lithium battery 200. The vacuum pumping device 160 is configured in a conventional manner, and the vacuum pumping device 160 pumps air to the buffer cup 140 through the vacuum pumping pipeline 161, so that a near vacuum state can be present in the buffer cup 140. Because the buffer cup 140 is hermetically connected with the liquid filling port of the lithium battery 200 through the liquid filling port 143, the inner cavity of the lithium battery 200 is communicated with the buffer cup 140 through the liquid filling port 143 and is also in a vacuum state. Therefore, the electrolyte can be injected into the lithium battery 200 through the buffer cup 140 at a further increased speed in a vacuum state or a near vacuum state.

More specifically, the liquid filling port 143 and the liquid outlet 115 are respectively connected to a liquid filling nozzle 170, wherein the liquid outlet 115 is connected to a liquid outlet pipe hermetically connected to the liquid outlet 115, or the liquid outlet 115 is provided as a liquid outlet pipe integrally provided with the dosing cup 110. A control valve is arranged on the liquid outlet pipeline, and the tail end of the liquid outlet pipeline is hermetically connected with a liquid injection nozzle 170. The bottom of the liquid filling nozzle 170 may be made of rubber with elastic material, and when the bottom of the liquid filling nozzle 170 disposed on the liquid outlet 143 contacts with the top surface of the buffer cup 140, the sealing between the liquid filling nozzle 170 and the buffer cup 140 may be achieved. Similarly, the pouring nozzle 170 at the pouring port 143 may be provided as above, but the control valve may not be provided in the pipe line at the pouring port 143.

Referring to fig. 1 and fig. 2, a lithium battery filling apparatus 100 includes a circulating liquid supply system 120, a dosing cup 110, a buffer cup 140, and a valve. The circulating liquid supply system 120 comprises a liquid storage tank 121, the dosing cups 110 are added on each buffer cup 140, the volume of each dosing cup 110 is the same, the dosing cups 110 are provided with inlet and outlet nozzles, and electrolyte in the liquid storage tank 121 is injected into the dosing cups 110 through the circulating liquid supply system 120.

The lithium battery electrolyte injection device 100 works as follows: 1. after the lithium battery 200 is combined with the cache cup 140, the lithium battery is jacked up by the jacking mechanism 150, and the cache cup 140 is combined with the liquid injection nozzle 170 of the quantifying cup 110; 2. The circulating liquid supply system 120 injects the electrolyte into the dosing cups 110 from the liquid storage tank 121, and ensures that the dosing cups 110 are filled with the electrolyte and the volumes of the dosing cups 110 are consistent through saturated liquid injection; 3 closing the liquid inlet/outlet valve; 4. opening a vacuumizing pipeline valve of the cache cup 140, vacuumizing the cache cup 140 and the lithium battery 200 to enable the interiors of the cache cup 140 and the lithium battery 200 to be in a vacuum state, and detecting whether the connection part of each part is sealed or not through vacuum leakage; 5. opening a control valve between the dosing cups 110 and the buffer cups 140, wherein the electrolyte enters the buffer cups 140 and the lithium battery 200 through negative pressure, and simultaneously opening a compressed air valve of the dosing cups 110, so that the electrolyte is accelerated to flow into the buffer cups 140 by applying positive pressure to the dosing cups 110, and the liquid of each dosing cup 110 is ensured to flow into the buffer cups 140; 6. after the liquid injection is completed, the jacking mechanism 160 descends, the buffer cup 140 is separated from the quantifying cup 110, and the lithium battery 200 and the buffer cup 140 enter a standing station.

According to the above description, the present application has the following advantages:

1. by arranging the quantifying cup 110, the precise quantification of the electrolyte can be realized;

2. the plurality of quantitative cups 110 are sequentially filled with liquid through the circulating liquid supply system 120, and then the quantitative cups 110 filled with the electrolyte overflow through the overflow ports 113, so that the consistency of the electrolyte in the plurality of quantitative cups 110 can be ensured through an excessive liquid injection mode;

3. positive pressure is applied to the quantitative cup 110 through the pressurizing system 130, so that the electrolyte in the quantitative cup 110 can be completely injected into the buffer cup 140 under the action of air pressure, the speed can be increased, and the efficiency is improved;

4. the buffer cup 140 is arranged on the lithium battery 200, the buffer cup 140 is connected with the lithium battery 200, the lithium battery 200 and the buffer cup 140 are driven by the jacking mechanism 150 to be separated from or combined with the quantifying cup 110, and the separated lithium battery 200 and the buffer cup 140 are placed still together, so that the efficiency can be improved;

5. through evacuating device 160, when annotating the liquid earlier to cache cup 140 and lithium cell 200 evacuation to ensure each connection portion leakproofness, under the effect of negative pressure, can inhale buffer cup 140 with electrolyte, guaranteed that the electrolyte in the buffer cup 140 can all get into in the lithium cell 200.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. A lithium battery liquid injection device is characterized by comprising:

the quantitative cup comprises a plurality of quantitative cups (110), wherein the quantitative cups (110) are sequentially arranged at intervals, each quantitative cup (110) is provided with a liquid inlet (111), an overflow port (113) and a liquid outlet (115), and the liquid outlets (115) are suitable for filling liquid into lithium batteries (200) which correspond to the quantitative cups (110) one by one;

and the circulating liquid supply system (120) is connected with the liquid inlets (111) and the overflow ports (113), so that the circulating liquid supply system (120) supplies liquid to the plurality of dosing cups (110) through at least one liquid inlet (111) and returns liquid through at least one overflow port (113).

2. The lithium battery filling device as recited in claim 1, wherein the circulating liquid supply system (120) comprises:

a liquid storage tank (121) having a liquid outlet (1211) and a liquid return port (1213);

and the liquid supply pipeline (123) is connected with the liquid outlet (1211), the liquid return port (1213), the liquid inlet (111) and the overflow port (113) of different quantitative cups (110), so that the circulating liquid supply system (120) sequentially supplies liquid to the quantitative cups (110) through one liquid inlet (111) and returns the liquid to the liquid storage tank (121) through one overflow port (113).

3. The lithium battery electrolyte injection device according to claim 2, wherein the liquid supply pipeline (123) comprises:

an infusion mechanism (1231) connected to the liquid outlet (1211);

an overflow pipe (1233) having one end connected to the liquid inlet (111) of one of the quantitative cups (110), and the other end of the overflow pipe (1233) connected to the overflow port (113) of another adjacent quantitative cup (110);

a liquid return pipe (1235) with one end connected with the liquid return port (1213);

the liquid inlet (111) which is not connected with the overflow pipe (1233) is connected with the output port of the transfusion mechanism (1231), and a liquid level meter is arranged in the overflow port (113) which is not connected with the overflow pipe (1233) and is connected with the other end of the liquid return pipe (1235).

4. The lithium battery electrolyte injection device according to any one of claims 1 to 3, wherein the overflow port (113) is arranged at the top of the quantitative cup (110), and the liquid outlet (115) is arranged at the bottom of the quantitative cup (110).

5. The lithium battery filling device according to any one of claims 1 to 3, further comprising:

a pressurization system (130) connected to at least one of the liquid inlets (111).

6. The lithium battery electrolyte injection device according to any one of claims 1 to 3, further comprising:

the buffer cups (140) correspond to the quantifying cups (110) one by one, each buffer cup (140) is provided with a liquid inlet (141) and a liquid injection port (143), the liquid inlet (141) is connected with the liquid outlet (115), and the liquid injection port (143) is connected with a liquid injection port of the lithium battery (200);

a jacking mechanism (150);

the lithium battery (200) is arranged on the jacking mechanism (150), and the jacking mechanism (150) is suitable for driving the buffer cup (140) to enable the liquid inlet (141) and the liquid outlet (115) to be connected or separated.

7. The lithium battery liquid injection device according to claim 6, wherein the jacking mechanism (150) comprises:

a telescopic section (151);

a top plate (153) connected to the telescopic part (151);

wherein the lithium battery (200) is disposed on the top plate (153).

8. The lithium battery electrolyte injection device according to claim 6, wherein the buffer cup (140) has an inner bottom wall (145) inclined from an inner side wall of the buffer cup (140) to the electrolyte injection port (143).

9. The lithium battery electrolyte injection device according to claim 6, further comprising:

a vacuum-pumping device (160) having a vacuum-pumping line (161);

the buffer cup (140) is provided with an air outlet (147), the air outlet (147) is connected with the vacuumizing pipeline, and the liquid filling port (143) is hermetically connected with a liquid filling port of the lithium battery (200).

10. The lithium battery liquid injection device according to claim 6, wherein a liquid injection nozzle (170) is connected to each of the liquid injection port (143) and the liquid outlet (115).