CN220324670U - Liquid pumping and filling device of high-capacity battery - Google Patents

Abstract

The utility model belongs to the field of batteries, and particularly relates to a liquid pumping and injecting device of a high-capacity battery. The problem that electrolyte is difficult to inject into the inner cavities of all the single batteries through the shared cavity is solved. The device comprises a first electrolyte storage tank, a protective gas bottle, a vacuumizing device, a first tee pipe section and a second tee pipe section; one end of the first three-way pipe section is connected with the vacuumizing equipment, the other end of the first three-way pipe section extends into the first electrolyte storage tank through the liquid port of the first electrolyte storage tank, and the third end of the first three-way pipe section is used for being connected with a shared cavity port of the high-capacity battery; two ends of the second three-way pipe section are respectively connected with a protective gas bottle and a vacuumizing device, and the other end of the second three-way pipe section extends into the first electrolyte storage tank through a gas port of the first electrolyte storage tank; and after the first three-way pipe section is connected with the port of the shared cavity of the high-capacity battery, the liquid sucking and injecting process can be realized outside the glove box by controlling the on-off of each valve.

Description

Liquid pumping and filling device of high-capacity battery

Technical Field

The utility model belongs to the field of batteries, and particularly relates to a liquid pumping and injecting device of a high-capacity battery.

Background

In the market, a plurality of single batteries are connected in parallel or in series to form a large-capacity battery (also called a battery module or a battery pack).

However, in the existing large-capacity battery, each single battery has a difference, and due to the existence of the barrel effect, the single battery with the worst performance is often affected, so that the upper limit of the capacity and the cycle number of the whole large-capacity battery are extremely limited. Therefore, how to improve the uniformity of each single battery in the large-capacity battery becomes an important point and a difficult point of research in the field.

In order to solve the above-mentioned problems, a related art proposes a large-capacity battery including a battery pack body formed by connecting a plurality of unit cells in parallel and at least one shared chamber; each single battery inner cavity comprises a gas area and an electrolyte area; the inner cavities of all the single batteries are communicated with the sharing chamber through the through holes formed in the outer shells of all the single batteries and the open holes formed in the sharing chamber.

When the high-capacity battery is prepared, the sealing film layer is required to be arranged at the through hole, so that the inner cavity of the single battery is isolated from air, when electrolyte is injected from the outside to the inside of the battery shell through the shared cavity, the electrolyte acts on the sealing film layer to open the sealing film layer, and the electrolyte enters the inside of each battery shell, so that the electrolytes and/or gases in a plurality of battery shells circulate mutually, and the performance and the service life of the battery are improved.

The large-capacity battery needs to go through a trial production stage before mass production, and because the requirement on external environment is more severe in the step of injecting electrolyte in the manufacturing process of the large-capacity battery, a workshop suitable for the production of the large-capacity battery is directly built, and large time cost and economic cost are needed to be input, so that the device and the method for injecting the electrolyte into the inner cavities of all batteries through the shared cavity in the trial production stage are the technical problem which needs to be solved currently.

Disclosure of Invention

The utility model aims to provide a liquid pumping and injecting device for a high-capacity battery, which solves the problem that electrolyte is difficult to inject into the inner cavities of all single batteries through a shared cavity.

The technical scheme of the utility model is to provide a liquid pumping and injecting device of a high-capacity battery, which is characterized in that: the device comprises a first electrolyte storage tank, a protective gas bottle, a vacuumizing device, a first tee pipe section and a second tee pipe section;

the first electrolyte storage tank is provided with a liquid port and a gas port;

one end of the first three-way pipe section is connected with a vacuumizing device, the other end of the first three-way pipe section extends into the first electrolyte storage tank through a liquid port of the first electrolyte storage tank, and a third end of the first three-way pipe section is used for being connected with a shared cavity port of the high-capacity battery;

two ends of the second tee pipe section are respectively connected with a protective gas bottle and a vacuumizing device, and the other end of the second tee pipe section extends into the first electrolyte storage tank through a gas port of the first electrolyte storage tank and is more distant from the bottom of the first electrolyte storage tank than the other end of the first tee pipe section;

and a plurality of valves are arranged on the first tee pipe section and the second tee pipe section, and the liquid pumping and injecting process is realized by controlling the on-off of the valves.

Further, the first tee pipe section comprises a first pipe section, a second pipe section and a third pipe section which are connected through tee joints; the first pipe section, the second pipe section and the third pipe section are respectively provided with a first valve, a second valve and a third valve;

the free end of the first pipe section is used for being connected with a shared chamber port of the high-capacity battery;

the free end of the second pipe section extends into the first electrolyte storage tank through the liquid port of the first electrolyte storage tank;

the free end of the third pipe section is connected with a vacuum pumping device.

Further, the liquid pumping and filling device of the high-capacity battery further comprises a pagoda joint; the free end of the first pipe section is connected with a shared cavity port of the high-capacity battery through a pagoda joint.

Further, the second tee pipe section comprises a fourth pipe section, a fifth pipe section and a sixth pipe section which are connected through a tee joint; the fourth pipe section, the fifth pipe section and the sixth pipe section are respectively provided with a fourth valve, a fifth valve and a sixth valve;

the free end of the fourth pipe section extends into the first electrolyte storage tank through the gas port of the first electrolyte storage tank;

the free end of the fifth pipe section is connected with a vacuumizing device;

the free end of the sixth pipe section is connected with a protective gas bottle.

Further, the liquid pumping and filling device of the high-capacity battery further comprises a second electrolyte storage tank, a seventh pipe section and an eighth pipe section;

the second electrolyte storage tank is provided with a liquid port and a gas port;

a seventh valve and an eighth valve are respectively arranged on the seventh pipe section and the eighth pipe section;

one end of the seventh pipe section extends into the second electrolyte storage tank through a liquid port of the second electrolyte storage tank, the other end of the seventh pipe section is connected with the second pipe section, and the connecting part is positioned between the three-way joint and the second valve;

one end of the eighth pipe section extends into the second electrolyte storage tank through a gas port of the second electrolyte storage tank, and the distance between the eighth pipe section and the bottom of the second electrolyte storage tank is larger than that between the seventh pipe section and the bottom of the second electrolyte storage tank; the other end of the eighth pipe section is connected with the sixth pipe section, and the connecting part is positioned between the fifth valve and the sixth valve.

Further, the liquid pumping and injecting device of the high-capacity battery further comprises a quick screwing joint, and the free end of the first pipe section is connected with the port of the shared cavity of the high-capacity battery through the quick screwing joint.

The beneficial effects of the utility model are as follows:

1. according to the utility model, the protection gas bottle, the vacuumizing equipment and the electrolyte storage tank are integrated into a reliable liquid pumping and injecting device through ingenious arrangement of the pipelines and the valves, the high-capacity battery and the electrolyte storage tank are connected with part of the structure of the liquid pumping and injecting device in the glove box, the influence of the external environment on the inner cavity of the high-capacity battery and the inner cavity environment of the electrolyte storage tank is avoided, and after connection of other parts is completed outside the glove box, the liquid pumping and injecting process is realized by controlling the on-off states of all the valves of the liquid pumping and injecting device and the start and stop of the protection gas bottle and the vacuumizing equipment; in addition, in order to avoid the influence of gas or impurities in the liquid pumping and injecting device on the liquid pumping and injecting process of the high-capacity battery, before liquid pumping and injecting is carried out, the protective gas can be replaced into the liquid pumping and injecting device outside the glove box by controlling the on-off state of each valve of the liquid pumping and injecting device, and the start and stop of the protective gas bottle and the vacuum pumping equipment.

2. The port of the shared cavity of the high-capacity battery is also convenient to connect, after the port of the shared cavity is opened in the glove box, the port can be sealed by utilizing a valve on the liquid sucking and injecting device, and the assembly can be taken out of the glove box and the rest part of the liquid sucking and injecting device for assembly.

3. By using the liquid pumping and injecting device, the liquid pumping and injecting process of the high-capacity battery can be completed at the same time, and after liquid pumping or liquid injection is completed, liquid injection or liquid injection can be realized by controlling the opening or closing of the related valve, so that a new liquid pumping and injecting device is not required to be replaced in the middle, the operation is convenient, and the use cost is low.

Drawings

Fig. 1 is a schematic diagram showing the structure of a connection between a liquid pumping and injecting device and a large-capacity battery in embodiment 1;

FIG. 2 is a schematic diagram of the liquid extraction and injection device according to the embodiment 1;

fig. 3 is a schematic diagram showing the structure of the connection of the liquid pumping and injecting device and the large-capacity battery in embodiment 2;

FIG. 4 is a schematic diagram of the liquid pumping and injecting device according to the embodiment 2;

the reference numerals are as follows: 11. a first pipe section; 111. a first sub-pipe of the first pipe section; 12. a second pipe section; 121. a first sub-pipe of the second pipe section; 13. a third pipe section; 14. a fourth pipe section; 141. a first sub-pipe of the fourth pipe section; 15. a fifth pipe section; 16. a sixth pipe section; 17. a seventh pipe segment; 171. a first sub-pipe of the seventh pipe section; 18. an eighth pipe section; 181. a first sub-pipe of the eighth pipe section; 20. a first valve; 21. a second valve; 22. a third valve; 23. a fourth valve; 24. a fifth valve; 25. a sixth valve; 26. a seventh valve; 27. an eighth valve; 30. a first electrolyte storage tank; 31. a second electrolyte storage tank; 40. a vacuum pumping device; 41. a shielding gas bottle; 50. a high-capacity battery; 501. a shared chamber; 60. a pagoda joint; 61. a three-way joint; 62. tee joint with ball valve; 63. and (5) screwing the joint quickly.

Detailed Description

So that the manner in which the above recited objects, features and advantages of the present utility model can be understood in detail, a more particular description of the utility model, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, but the present utility model may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be noted that the azimuth or positional relationship indicated by "top, bottom" or the like in terms are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first, second, third, fourth, etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The utility model relates to a liquid pumping and injecting device for a high-capacity battery, which comprises a battery pack main body and at least one sharing chamber; the battery pack main body comprises a plurality of unit batteries which are connected in parallel; the single battery is a square shell battery, and the square shell battery comprises an upper cover plate, a lower cover plate, a cylinder body, a battery cell component and electrolyte; the cell assembly may be referred to herein as an electrode assembly, which is assembled by sequentially arranging a positive electrode, a separator, and a negative electrode, using a lamination or winding process. The cell assembly described herein may also be a commercially available shell battery; the upper cover plate, the cylinder body and the lower cover plate form a square shell battery shell, and the battery core component and the electrolyte are positioned in the single battery shell.

The sharing cavity is fixed on the group battery main part, and sharing cavity inner chamber link up with the inner chamber of each battery cell.

When the sharing chamber is fixed at the bottom of the battery pack main body, the sharing chamber can be used as an electrolyte sharing chamber, and the electrolytes in the inner cavities of all the single batteries are communicated through the electrolyte sharing chamber, so that the electrolytes of all the single batteries are in the same system, the difference between the electrolytes of all the single batteries is reduced, the consistency between the single batteries is improved to a certain extent, and the cycle life of the high-capacity battery is prolonged to a certain extent.

When the sharing cavity is fixed at the top of the battery pack main body, the sharing cavity can be used as a gas communication cavity, and the gas in the inner cavities of all the single batteries is communicated through the gas communication cavity, so that the gas in the inner cavities of the whole large-capacity battery is balanced, and the cycle life of the large-capacity battery is prolonged to a certain extent.

The sharing chamber can also be used as an electrolyte sharing chamber and a gas communication chamber when the sharing chamber is fixed on the side wall of the battery pack main body, gas and electrolyte in each single battery can enter the sharing chamber at the same time, at the moment, the gas is distributed on the upper half part of the sharing chamber, and the electrolyte is distributed on the lower half part of the sharing chamber; the gas-liquid sharing can be realized through one sharing chamber.

By utilizing the liquid pumping and injecting device provided by the utility model, electrolyte in the inner cavities (comprising the inner cavities of all the single batteries and the inner cavities of the shared cavity) of the large-capacity battery can be pumped out from the outside of the glove box, and electrolyte can be injected into the inner cavities of the large-capacity battery, so that the liquid pumping and injecting device has lower requirement on the liquid pumping and injecting environment.

The utility model is further described below in connection with specific embodiments.

Example 1

The sharing chamber 501 of the large-capacity battery 50 to be pumped and injected in this embodiment is fixed at the bottom of the battery pack body and serves as an electrolyte sharing chamber.

The liquid pumping and priming device of this embodiment is shown in fig. 1 and 2, and includes a first pipe section 11, a first electrolyte storage tank 30 connected in parallel to one end of the first pipe section 11 through a second pipe section 12 and a third pipe section 13, and a vacuum pumping device 40. The first electrolyte reservoir 30 is provided with a gas port and a liquid port through which the free end of the second tube section 12 extends into the first electrolyte reservoir 30. The vacuum-pumping apparatus 40 may employ a vacuum generator, a vacuum pump, or the like.

Wherein the other end of the first tube section 11 is adapted to be connected to one end of a shared chamber 501 of the large-capacity battery 50 to be pumped and injected. In order to facilitate connection and ensure tightness after connection, the present embodiment adopts the pagoda joint 60 to achieve connection of the two.

The first pipe section 11, the second pipe section 12 and the third pipe section 13 are connected by a three-way joint 61 to form a first three-way pipe section. Valves are arranged on the first pipe section 11, the second pipe section 12 and the third pipe section 13, and the pumping and injecting states of the first electrolyte storage tank 30 can be respectively controlled by controlling the on-off states of the corresponding valves. For convenience of description, the valves on the first, second and third pipe sections 11, 12 and 13 may be defined as first, second and third valves 20, 21 and 22, respectively.

As can be seen from the figure, the liquid pumping and injecting device of the present embodiment further includes a protective gas bottle 41, for example, a nitrogen bottle, or argon, helium, etc.; the shielding gas bottle 41 is connected to the first electrolyte storage tank 30 and the evacuation device 40 through second three-way pipe sections, respectively. For convenience of description, the three pipe sections of the second three-way pipe section may be defined as a fourth pipe section 14, a fifth pipe section 15, and a sixth pipe section 16, respectively. In this embodiment, a tee 62 with a ball valve is used to connect the fourth pipe segment 14, the fifth pipe segment 15 and the sixth pipe segment 16 to form a second tee pipe segment. A fourth valve 23 is provided on the fourth pipe section 14. Two valves of the tee 62 with ball valves may be defined as a fifth valve 24 and a sixth valve 25, located at the interfaces with the fifth pipe segment 15 and the sixth pipe segment 16, respectively. In other embodiments, the fourth pipe section 14, the fifth pipe section 15 and the sixth pipe section 16 may be connected by using a common three-way joint, and the fifth valve 24 and the sixth valve 25 are respectively disposed on the fifth pipe section 15 and the sixth pipe section 16. The free end of the fourth pipe section extends into the first electrolyte storage tank 30 through the gas port, and in order to monitor the pressure during the liquid pumping and injecting process, a pressure gauge is further provided in the fourth pipe section 14 in this embodiment. The free ends of the fifth pipe section 15 and the sixth pipe section 16 are connected to a vacuum pumping device 40 and a shielding gas bottle 41, respectively.

It should be noted that:

1. in the first electrolyte storage tank 30, the end of the second pipe section 12 is at a smaller distance from the bottom of the first electrolyte storage tank 30 than the end of the fourth pipe section 14.

2. In the process of liquid extraction and injection, electrolyte is arranged in the liquid extraction and injection device, so that the connection parts of each pipe section and the valve are required to be sealed, and the influence of the external environment on the electrolyte is avoided.

3. The pipe sections, the valves, and the first electrolyte storage tank 30 are made of materials that do not react with the electrolyte, and may be made of polytetrafluoroethylene, PE (polyethylene), PP (polypropylene), or the like.

4. Because there is a vacuum negative pressure in the process of pumping and injecting liquid, the selected first electrolyte storage tank 30 should resist a certain negative pressure, otherwise, the tank body will be flattened.

The liquid extraction can be carried out by the following steps:

because the glove box has limited space, the following partial steps are carried out in the glove box, and the partial steps are carried out outside the glove box;

step 1, connecting a liquid pumping and injecting device with a high-capacity battery 50;

step 1.1, opening a plug at the end part of a sharing cavity 501 of the large-capacity battery 50 in a glove box, plugging a pagoda joint 60 at the end part of the sharing cavity 501 of the large-capacity battery 50, connecting a first sub-pipe 111 of a first pipe section to the pagoda joint 60, connecting a first valve 20 at the end part of the first sub-pipe, and closing the first valve 20; taking the assembly out of the glove box for standby;

step 1.2, inserting one end of a first sub-pipe 121 of a second pipe section into a first electrolyte storage tank 30 in a glove box, connecting a second valve 21 to the other end of the first sub-pipe 121 of the second pipe section, and closing the second valve 21; inserting one end of the first sub-pipe 141 of the fourth pipe section into the first electrolyte storage tank 30, then connecting the fourth valve 23 to the other end of the first sub-pipe 141 of the fourth pipe section, and closing the fourth valve 23; taking the assembly out of the glove box for standby;

step 1.3, connecting the rest pipe sections, the vacuumizing equipment 40 and the shielding gas bottle 41 outside the glove box;

step 1.4, assembling the assembly parts of step 1.1, step 1.2 and step 1.3, and completing the connection of the liquid pumping and injecting device and the large-capacity battery 50.

In other embodiments, the liquid extraction and injection device may be connected to the large-capacity battery 50 inside the glove box after the assembly is completed outside the glove box.

Step 2, ventilation;

the third valve 22, the fifth valve 24 and the sixth valve 25 are opened, and the rest valves are kept in a closed state and the shielding gas bottle 41 is closed; opening the vacuumizing equipment 40 to perform vacuumizing treatment, pumping out the pipelines between the first valve 20, the second valve 21 and the third valve 22 and the gas in the third pipe section 13, part of the fourth pipe section 14, the fifth pipe section 15 and the sixth pipe section 16, opening the protective gas bottle 41 to supply protective gas when the gauge head of the pressure gauge is displayed as negative pressure, closing the vacuumizing equipment 40 at the moment, and completing a ventilation process after the gauge head of the pressure gauge is observed as positive pressure; after the ventilation operation is performed a plurality of times, the fifth valve 24 and the sixth valve 25 are closed.

Step 3, liquid pumping;

sequentially closing the third valve 22, opening the vacuumizing device 40, closing the sixth valve 25, and opening the fifth valve 24, the fourth valve 23, the second valve 21 and the first valve 20, wherein electrolyte in the inner cavity of the large-capacity battery 50 is pumped out to the first electrolyte storage tank; after the liquid is pumped, the first valve 20 is closed, and then the second valve 21, the fourth valve 23, the fifth valve 24 and the vacuumizing device 40 are sequentially closed.

The liquid injection can be carried out by the following steps:

step 1, connecting a liquid pumping and injecting device with a high-capacity battery 50;

this step is substantially identical to step 1 in the above-described drawing process, except that in step 1.2, it is necessary to inject the electrolyte into the first electrolyte storage tank 30.

Step 2, ventilation;

this step is completely identical to step 2 in the above-mentioned liquid extraction process, and will not be described here again.

Step 3, injecting liquid;

and closing the third valve 22 and the fifth valve 24, sequentially opening the shielding gas bottle 41, the sixth valve 25, the fourth valve 23, the second valve 21 and the first valve 20, filling liquid, sequentially closing the first valve 20, the second valve 21, the fourth valve 23 and the sixth valve 25 after filling liquid, and finally closing the shielding gas bottle 41.

It should be noted that if both the liquid and the liquid are to be pumped from the same large-capacity battery 50, two sets of liquid pumping and injecting devices according to this embodiment may be used. Alternatively, a set of valves may be used, after the liquid extraction is completed, all valves are closed, the first sub-tube 121 with the second tube section, the first sub-tube 141 with the fourth tube section, the second valve 21 and the first electrolyte storage tank 30 with the fourth valve 23 are placed in a glove box, the electrolyte in the first sub-tube is replaced by the electrolyte required for liquid injection, and then the first sub-tube is connected to a pipeline outside the glove box to form a liquid extraction and injection device, so that the steps 2 and 3 are performed.

Example 2

Unlike embodiment 1, this embodiment further includes a second electrolyte storage tank 31. The liquid sucking and injecting device can simultaneously realize liquid sucking and injecting. In addition, the present embodiment connects the first pipe section 11 with the large-capacity battery 50 sharing chamber 501 through the quick-screw fitting 63.

As can be seen from fig. 3 and 4, the second electrolyte storage tank 31 of the present embodiment is connected to the first pipe section 11 through the seventh pipe section 17 and connected to the sixth pipe section 16 through the eighth pipe section 18. In order to make the first electrolyte storage tank 30, the second electrolyte storage tank 31 and the vacuum pumping device 40 all connected in parallel at one end of the first pipe section 11, in this embodiment, two tee joints 61 are connected in series at one end of the first pipe section 11, and three external joints of the two tee structures are respectively connected with the second pipe section 12, the third pipe section 13 and the seventh pipe section 17.

As can be seen from the figure, the present embodiment is provided with at least one valve on each of the seventh pipe section 17 and the eighth pipe section 18, which can be defined as a seventh valve 26 and an eighth valve 27, respectively.

In this embodiment, the tee 62 with ball valve in embodiment 1 is replaced by a common tee joint, the fifth valve 24 is disposed near the evacuation device 40, and the sixth valve 25 is disposed near the shielding gas bottle 41.

The liquid pumping and injecting can be carried out by the following steps:

step 1, connecting a liquid pumping and injecting device with a high-capacity battery 50;

step 1.1, opening a plug at the end of the sharing cavity 501 of the high-capacity battery 50 in a glove box, connecting the first valve 20 to the end of the sharing cavity 501, and closing the first valve 20; taking the assembly out of the glove box for standby;

step 1.2, in a glove box, injecting electrolyte into the second electrolyte storage tank 31, inserting one end of the first sub-tube 171 of the seventh tube section into the second electrolyte storage tank 31 with the end below the electrolyte level, then connecting the seventh valve 26 to the other end of the first sub-tube 171 of the seventh tube section, and closing the seventh valve 26; inserting one end of the first sub pipe 181 of the eighth pipe section into the second electrolyte storage tank 31 with the end above the electrolyte level, then connecting the eighth valve 27 to the other end of the first sub pipe 181 of the eighth pipe section, and closing the eighth valve 27; taking the assembly out of the glove box for standby;

step 1.3, connecting the rest pipe sections, the first electrolyte storage tank 30, the vacuumizing device 40 and the shielding gas bottle 41 outside the glove box;

step 1.4, assembling the assembly parts of step 1.1, step 1.2 and step 1.3, and completing the connection of the liquid pumping and injecting device and the large-capacity battery 50.

Step 2, ventilation;

the first valve 20, the seventh valve 26 and the sixth valve 25 are closed and the remaining valves are opened. Opening the vacuumizing equipment 40, vacuumizing, opening the sixth valve 25 when the pressure gauge displays negative pressure, introducing protective gas into the system, and closing the vacuumizing equipment 40; after observing that the gauge head of the pressure gauge is positive pressure, finishing a ventilation process; after a plurality of ventilation operations, the evacuation equipment 40 and the sixth valve 25 are closed.

Step 3, pumping and injecting liquid;

and (3) liquid pumping: closing the third valve 22, opening the vacuumizing device 40, closing the sixth valve 25, and sequentially opening the fifth valve 24, the fourth valve 23, the second valve 21 and the first valve 20, wherein electrolyte in the inner cavity of the large-capacity battery 50 is pumped out into the first electrolyte storage tank 30; after the liquid extraction is completed, the first valve 20 is closed, and then the second valve 21, the fourth valve 23, the fifth valve 24 and the vacuum extraction equipment 40 are sequentially closed;

and (3) liquid injection: the sixth valve 25, the eighth valve 27, the seventh valve 26 and the first valve 20 are sequentially opened to fill liquid, the liquid filling speed can be controlled through the flow adjusting function of the sixth valve 25, the first valve 20, the seventh valve 26 and the eighth valve 27 are sequentially closed after the liquid filling is finished, the sixth valve 25 is finally closed, and the liquid filling is finished.

Claims (6)

1. The utility model provides a high-capacity battery's drawing and filling liquid device which characterized in that: comprises a first electrolyte storage tank (30), a protective gas bottle (41), a vacuumizing device (40), a first three-way pipe section and a second three-way pipe section;

the first electrolyte storage tank (30) is provided with a liquid port and a gas port;

one end of the first three-way pipe section is connected with a vacuumizing device (40), the other end of the first three-way pipe section extends into the first electrolyte storage tank (30) through a liquid port of the first electrolyte storage tank (30), and a third end of the first three-way pipe section is used for being connected with a port of a sharing cavity (501) of the high-capacity battery (50);

two ends of the second three-way pipe section are respectively connected with a protective gas bottle (41) and a vacuumizing device (40), and the other end of the second three-way pipe section extends into the first electrolyte storage tank (30) through a gas port of the first electrolyte storage tank (30) and is farther from the bottom of the first electrolyte storage tank (30) than the other end of the first three-way pipe section;

and valves are arranged on each passage of the first tee pipe section and the second tee pipe section, and the liquid pumping and injecting process is realized by controlling the on-off of the valves.

2. The liquid pumping and injecting device for a large-capacity battery according to claim 1, wherein: the first tee pipe section comprises a first pipe section (11), a second pipe section (12) and a third pipe section (13) which are connected through a tee joint (61); a first valve (20), a second valve (21) and a third valve (22) are respectively arranged on the first pipe section (11), the second pipe section (12) and the third pipe section (13);

the free end of the first pipe section (11) is used for being connected with a port of a shared cavity (501) of the high-capacity battery (50);

the free end of the second pipe section (12) extends into the first electrolyte storage tank (30) through a liquid port of the first electrolyte storage tank (30);

the free end of the third tube section (13) is connected to a vacuum-pumping device (40).

3. The liquid pumping and injecting device for a large-capacity battery as claimed in claim 2, wherein: the device also comprises a pagoda joint (60); the free end of the first pipe section (11) is connected with a port of a shared cavity (501) of the high-capacity battery (50) through a pagoda joint (60).

4. The liquid pumping and injecting device for a large-capacity battery as claimed in claim 2, wherein: the second tee pipe section comprises a fourth pipe section (14), a fifth pipe section (15) and a sixth pipe section (16) which are connected through a tee joint (61); a fourth valve (23), a fifth valve (24) and a sixth valve (25) are respectively arranged on the fourth pipe section (14), the fifth pipe section (15) and the sixth pipe section (16);

the free end of the fourth pipe section (14) extends into the first electrolyte storage tank (30) through a gas port of the first electrolyte storage tank (30);

the free end of the fifth pipe section (15) is connected with a vacuumizing device (40);

the free end of the sixth pipe section (16) is connected with a shielding gas bottle (41).

5. The liquid pumping and injecting device for a large capacity battery as claimed in claim 4, wherein: the device also comprises a second electrolyte storage tank (31), a seventh pipe section (17) and an eighth pipe section (18);

the second electrolyte storage tank (31) is provided with a liquid port and a gas port;

a seventh valve (26) and an eighth valve (27) are respectively arranged on the seventh pipe section (17) and the eighth pipe section (18);

one end of the seventh pipe section (17) extends into the second electrolyte storage tank (31) through a liquid port of the second electrolyte storage tank (31), the other end of the seventh pipe section is connected with the second pipe section (12), and the connecting part is positioned between the three-way joint (61) and the second valve (21);

one end of the eighth pipe section (18) extends into the second electrolyte storage tank (31) through a gas port of the second electrolyte storage tank (31), and the distance between the eighth pipe section and the bottom of the second electrolyte storage tank (31) is larger than that between the seventh pipe section (17) and the bottom of the second electrolyte storage tank (31); the other end of the eighth pipe section (18) is connected with the sixth pipe section (16), and the connecting part is positioned between the fifth valve (24) and the sixth valve (25).

6. The liquid pumping and injecting device for a large capacity battery according to claim 5, wherein: the device further comprises a quick-twist joint (63), and the free end of the first pipe section (11) is connected with a port of a shared cavity (501) of the high-capacity battery (50) through the quick-twist joint (63).