CN114583418B - Lithium battery liquid injection production method, liquid injection mechanism and liquid injection production equipment - Google Patents

Abstract

The invention discloses a lithium battery liquid injection production method, a liquid injection mechanism and liquid injection production equipment, wherein a plurality of rotary circulation type stations are arranged on a rotary table liquid injection production line, the battery can be vacuumized through the liquid injection mechanism in the rotation process of each station, electrolyte is quickly injected into the battery by utilizing the negative pressure effect, the injection time is shortened, and the injected electrolyte is further quickly permeated into the whole battery by pressurization; in the standing process of the battery, the vacuum pumping and the pressurization are respectively carried out on the inside of the battery by utilizing the first liquid injection hole and the second liquid injection hole, so that the injected electrolyte forms reciprocating motion in the inside of the battery between the first liquid injection hole and the second liquid injection hole, and the absorption efficiency of the electrolyte is accelerated. The invention can simply, conveniently and efficiently realize continuous production and processing of the lithium battery injection liquid, and remarkably improves the injection liquid production efficiency.

Description

Lithium battery liquid injection production method, liquid injection mechanism, and liquid injection production equipment

technical field

The invention relates to the technical field of lithium batteries, in particular to a liquid injection production method for lithium batteries, a liquid injection mechanism, and liquid injection production equipment.

Background technique

At present, the lithium battery industry is developing rapidly, and the power battery is advancing by leaps and bounds. With the advancement of technology, power batteries have become a major mainstream.

In the production process of lithium batteries, liquid injection is a very critical process. During the production process of the battery, the electrolyte needs to be injected through the liquid injection hole opened on it. However, since the position of the liquid injection hole is fixed, and most batteries only have a single liquid injection hole, the electrolyte solution entering the battery cavity through the liquid injection hole is prone to uneven distribution. Moreover, due to the existence of a certain amount of gas inside the battery, the injected electrolyte cannot well cover the entire space inside the battery, resulting in a small coverage area and slow liquid absorption by the battery. In addition, since the liquid injection needle and the liquid injection hole of the battery are in a sealed state before the liquid injection, the air pressure in the cavity will gradually increase during the liquid injection process, which in turn hinders the absorption speed of the electrolyte. These above-mentioned problems all can bring the deficiency that production efficiency reduces. However, if the injection pressure or injection speed is forcibly increased, hidden dangers such as liquid spraying and battery bulging may occur, which will affect product efficiency and quality.

Therefore, in order to cope with the rapid development of electronic products and the power battery market with a large demand, there is an urgent need for a new lithium battery injection technology.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned defects existing in the prior art, and provide a lithium battery liquid injection production method, liquid injection mechanism, and liquid injection production equipment, which can effectively improve or solve the problems of low liquid injection efficiency and battery deformation of existing power batteries. Adverse effects, improve the yield rate of the liquid injection process and the quality and safety of the battery, and shorten the production cycle of the overall battery manufacturing.

To achieve the above object, the technical scheme of the present invention is as follows:

The invention provides a lithium battery injection production method, comprising the following steps:

Step 1: Arranging the battery to be injected on the loading station, vacuuming the inside of the battery to a first vacuum degree through the first liquid injection hole provided on the top surface of the battery, and maintaining it for a first time;

Step 2: Turn the battery to the liquid injection station along the rotation center, continue to inject electrolyte solution into the battery through the first liquid injection hole and use the pressure difference, and the liquid injection time is the second time;

Step 3: pressurize the inside of the battery to a first pressure through the first liquid injection hole, and maintain it for a third time, and then release the pressure of the battery to normal pressure;

Step 4: Continue to transfer the battery to the static station, and during the static process, vacuumize the interior of the battery through the second liquid injection hole on the battery opposite to the first liquid injection hole To the second degree of vacuum, and maintain the fourth time;

Step 5: continue to pressurize the interior of the battery to a second pressure through the second liquid injection hole, and keep it for a fifth time;

Step 6: evacuate the interior of the battery to a third vacuum degree through the first liquid injection hole, and keep it for a sixth time;

Step 7: continue to pressurize the inside of the battery to a third pressure through the first liquid injection hole, and keep it for a seventh time;

Step 8: continue to transfer the battery to the unloading station, and release the pressure of the battery to normal pressure;

Wherein, the interior of the battery is vacuumed and pressurized respectively through the first liquid injection hole and the second liquid injection hole, so that the electrolyte injected into the battery is in the first liquid injection hole and the second liquid injection hole. The interior of the battery between the second liquid injection holes forms a reciprocating motion to accelerate the absorption efficiency of the electrolyte.

The beneficial effect of the above lithium battery liquid injection production method of the present invention is: by opening double liquid injection holes for the battery, so that the flow of the injected electrolyte can be controlled by pressure between the two liquid injection holes, and the electrolyte can be flown in the battery. Full coverage of the inside of the battery; by vacuuming the inside of the battery, the negative pressure formed can be used to quickly inject the electrolyte into the battery, shortening the injection time, and further pressurizing, so that the injected electrolyte can quickly penetrate into the entire battery and, during the standing process of the battery, by using the first liquid injection hole and the second liquid injection hole to perform vacuuming and pressurization respectively on the inside of the battery, the electrolyte injected into the battery is in the first liquid injection hole and the second liquid injection hole. The inside of the battery between the two liquid injection holes forms a reciprocating motion to accelerate the absorption efficiency of the electrolyte. Therefore, the above method can ensure the accuracy of battery liquid injection, speed up battery liquid absorption efficiency, improve battery quality, reduce the risk of liquid leakage, and can greatly reduce the risk of battery deformation, and is also conducive to improving the safety of the battery. The rotation and flow between the loading station and the unloading station reasonably allocates each production step to each station, so that the continuous production and processing of lithium battery liquid injection can be realized simply and efficiently.

Further, the steps 4 to 7 are cyclically executed one or more times. Among them, according to the size of the battery capacity, the amount of liquid injection and the composition of the battery, one or more static stations can be set up to adjust the number and time of alternating cycles. In this way, when the electrolyte circulates back and forth inside the battery between the first liquid injection hole and the second liquid injection hole, the absorption efficiency of the electrolyte can be accelerated.

Further, the first vacuum degree is greater than the second vacuum degree and the third vacuum degree. In this way, a relatively greater negative pressure state can be formed inside the battery before the liquid is injected, the injection speed of the electrolyte can be accelerated, and a large amount of electrolyte can be prevented from overflowing from the battery when it is flowing after injection.

Further, the first pressure, the second pressure and the third pressure are equal. In this way, the electrolyte in different stages can form a uniform flow inside the battery.

Further, the step 1 also includes the following steps:

performing an insulation test on the battery;

Weighing the battery before filling;

Carrying out loading into a jig for the battery;

After the eighth step, the following steps are also included:

performing dismantling of the battery;

Weighing the battery after liquid filling;

performing a sealing process on the first liquid injection hole and the second liquid injection hole;

And performing discharging and packing on the battery. In this way, the quality of the incoming battery before liquid injection can be guaranteed, and the liquid injection effect of the battery can be confirmed, and the sealing state after the battery liquid injection can be guaranteed; it is also possible to form a one-to-one traceable relationship between the battery and the fixture, and realize Closed-loop management of battery status.

The present invention also provides a lithium battery liquid injection mechanism, including:

The first needle and the second needle are used to be driven to respectively engage with the first liquid injection hole and the second liquid injection hole provided on the opposite ends of the top surface of the battery to be filled; wherein the first needle passes through the first liquid injection hole. A liquid storage cup is respectively connected to the liquid injection pipeline, the first vacuum pipeline and the first dry gas pipeline, and the second needle is respectively connected to the second vacuum pipeline and the second dry gas pipeline through the second liquid storage cup. Connected to the liquid injection pump, the first vacuum pipeline and the second vacuum pipeline are connected to a vacuum source, the first dry gas pipeline and the second dry gas pipeline are connected to a dry gas source, and the liquid injection pipeline There is a first valve on the first vacuum pipeline, a second valve on the first vacuum pipeline, a third valve on the first dry gas pipeline, a fourth valve on the second vacuum pipeline, and a fourth valve on the second dry gas pipeline. There is a fifth valve on the road;

Wherein, when the battery is sequentially transferred from the feeding station to the liquid injection station and the static station along the rotation center, by performing different combinations of opening and closing the first valve to the fifth valve, to The electrolyte is injected into the battery under negative pressure, and the inside of the battery is vacuumed and pressurized through the first liquid injection hole and the second liquid injection hole respectively, so that the electrolyte is in the The interior of the battery between the first liquid injection hole and the second liquid injection hole forms a reciprocating motion to accelerate the absorption efficiency of the electrolyte.

The beneficial effect of the lithium battery liquid injection mechanism of the present invention is that: by setting the first needle and the second needle, it can be driven to move to form a sealing engagement with the first liquid injection hole and the second liquid injection hole on the battery, Effectively ensure that the internal pressure of the battery meets the requirements during liquid injection and standing still; connect the first needle and the second needle to the vacuum source and the dry gas source respectively, and the battery can be pumped through the first needle or the second needle respectively. Vacuum and pressurization realize the reciprocating movement of the electrolyte inside the battery between the first liquid injection hole and the second liquid injection hole; The part of the electrolyte sucked out by the first liquid injection hole or the second liquid injection hole is buffered to prevent the electrolyte from flowing back to the vacuum source; by setting the first valve to the fifth valve, and executing the Different combinations of opening and closing, control the electrolyte to be injected into the battery under negative pressure, and control the vacuuming and pressurization of the battery through the first liquid injection hole and the second liquid injection hole, and control the electrolyte in the first The interior of the battery between the liquid injection hole and the second liquid injection hole forms a reciprocating motion to accelerate the absorption efficiency of the electrolyte.

Further, the different combinations of opening and closing the first valve to the fifth valve include:

When the battery is on the charging station, by opening the second valve and closing the first valve, the third valve to the fifth valve, the first liquid injection the hole draws a vacuum inside the battery;

When the battery is on the liquid injection station, by opening the first valve and closing the second valve to the fifth valve, the first liquid injection hole can be passed through the first liquid injection hole and the pressure difference can be used to Electrolyte is injected into the battery;

After liquid injection, by opening the third valve, and closing the first valve to the second valve and the fourth valve to the fifth valve, to pass through the first liquid injection hole to the Internal pressurization of the battery;

When the battery is at the resting station, firstly open the fourth valve, and close the first valve to the third valve and the fifth valve to pass the second injection The liquid hole vacuumizes the interior of the battery; then, by opening the fifth valve and closing the first valve to the four valves, the interior of the battery is pressurized through the second liquid injection hole; Then, by opening the second valve and closing the first valve, the third valve to the fifth valve, the interior of the battery is evacuated through the first liquid injection hole; after that, by The third valve is opened, and the first valve to the second valve and the fourth valve to the fifth valve are closed to pressurize the inside of the battery through the first liquid injection hole. In this way, through different combinations of opening and closing of the first valve to the fifth valve, the electrolyte can be injected into the battery under negative pressure, and the battery can be pumped through the first liquid injection hole and the second liquid injection hole respectively. Vacuum and pressurization make the electrolyte form an effective control of reciprocating movement inside the battery between the first liquid injection hole and the second liquid injection hole.

The present invention also provides a lithium battery liquid injection production equipment, including the above lithium battery liquid injection mechanism.

The beneficial effects of the above-mentioned lithium battery liquid injection production equipment of the present invention are: it can ensure the accuracy of battery liquid injection, speed up battery liquid absorption efficiency, improve battery quality, reduce the risk of liquid leakage, and can greatly reduce the risk of battery deformation, which is also conducive to improving The safety of the battery, and the equipment can easily and efficiently realize the continuous production and processing of lithium battery liquid injection.

Further, it also includes:

Turntable liquid injection production line, which is equipped with battery loading station, liquid injection station, one or more static stations and unloading station in sequence according to the rotation direction of the turntable. Each station is used to load the battery, and Through the rotation of the turntable, the batteries are sequentially circulated between the stations, and the liquid injection mechanisms are arranged above the stations of the turntable one by one, and can be driven synchronously Rotate and lift, so as to seal between the feeding station and the first liquid injection hole and the second liquid injection hole on the battery through the first needle and the second needle Engage, and move to the unloading station to separate from the first liquid injection hole and the second liquid injection hole. In this way, by setting up a turntable liquid injection production line, not only can the length of the production line be shortened and the production space saved, but also when the battery is injected and distributed alternately, it can cooperate with the liquid injection mechanism to effectively improve the efficiency of battery liquid absorption and The consistency of the liquid injection volume of the battery and the quality of the battery forming are guaranteed, and the production cycle of the overall battery manufacturing is shortened, thereby significantly reducing the cost.

Further, it also includes: a circulation production line, located on one side of the turntable liquid injection production line, which is sequentially provided with a battery incoming station, an insulation test station, a weighing station before liquid injection, a fixture buffer station, and a fixture dismantling station. Workstation, weighing station after liquid injection, post-processing station, and discharging and loading station;

Wherein, there is also a fixture loading station between the fixture buffer station and the loading station, the insulation test station, the weighing station before liquid injection, the weighing station after liquid injection, and the post-processing station. There is also a defective product buffering station on one side of the station, and the battery is connected between the weighing station before liquid injection and the fixture loading station through a robot. In this way, by setting up an insulation test station, the insulation performance of incoming batteries can be tested one by one, which is conducive to improving the safety of the battery; by setting up a weighing station before liquid injection and a weighing station after liquid injection, the batteries can be tested one by one. Scanning code before and after weighs to achieve closed-loop management of the production cycle of the battery injection process, which is conducive to improving battery quality. The battery provided by the embodiment of the present invention has good quality, which is beneficial to improving the energy density and safety of the battery.

Description of drawings

Fig. 1 is a schematic structural view of a liquid injection mechanism for a lithium battery according to a preferred embodiment of the present invention;

Fig. 2 is a schematic layout structure diagram of a lithium battery liquid injection production equipment according to a preferred embodiment of the present invention;

Fig. 3 is a schematic flowchart of a liquid injection production method for a lithium battery according to a preferred embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. the embodiment. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by those skilled in the art to which the present invention belongs. As used herein, "comprising" and similar words mean that the elements or items appearing before the word include the elements or items listed after the word and their equivalents, without excluding other elements or items.

The present invention is to provide a lithium battery liquid injection production method, liquid injection mechanism, and liquid injection production equipment, which can effectively improve or solve the adverse effects such as low liquid injection efficiency and battery deformation of current power batteries, and improve the yield rate of the liquid injection process and the battery quality. safety.

In the embodiment of the present invention, double liquid injection holes are opened for the battery, and the insulation test is performed on the incoming material, and then the code is scanned and weighed, and the battery is bound to the fixture to ensure that the battery has a one-to-one corresponding traceability effect, and then the liquid is injected , and then carry out distributed and alternating standing. After the standing is completed, the fixture is removed from the plate, and then the battery liquid injection effect is confirmed to realize the closed-loop management of the battery state. After that, the battery liquid injection hole is sealed, and finally the battery is put out material.

The invention can ensure the accuracy of battery liquid injection, speed up the battery liquid absorption efficiency, improve battery quality, reduce the risk of liquid leakage, greatly reduce the risk of battery deformation, and is also conducive to improving the safety of the battery. At the same time, the invention can conveniently and efficiently realize the continuous production and processing of lithium battery liquid injection.

The specific embodiment of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Refer to Figure 1. A lithium battery injection mechanism 20 of the present invention includes a first needle 202 and a second needle 220 . The first needle head 202 and the second needle head 220 are used to respectively engage with the first liquid injection hole 101 and the second liquid injection hole 103 provided on the opposite ends of the top surface of the battery 10 to be liquid injected below when being driven, The battery 10 is filled with liquid.

The first needle 202 is respectively connected to the liquid injection pipeline 205 , the first vacuum pipeline 211 and the first drying gas pipeline 209 through the first liquid storage cup 203 . The second needle 220 is respectively connected to the second vacuum pipeline 213 and the second drying gas pipeline 215 through the second liquid storage cup 219 .

The infusion line 205 is connected to an infusion pump 206 . The first vacuum line 211 and the second vacuum line 213 may be commonly connected to a vacuum source 212 . The first dry gas conduit 209 and the second dry gas conduit 215 may be commonly connected to a dry gas source 217 .

The liquid injection pipeline 205 is provided with a first valve 204, the first vacuum pipeline 211 is provided with a second valve 210, the first drying gas pipeline 209 is provided with a third valve 208, and the second vacuum pipeline 213 is provided with a fourth valve 214 , the second dry gas pipeline 215 is provided with a fifth valve 216 .

In a preferred embodiment, the first vacuum pipeline 211 and the first drying gas pipeline 209 can be connected to the first liquid storage cup 203 through the first communication pipeline 207; the second vacuum pipeline 213 and the second drying gas pipeline 215 can pass through The second communication pipe 218 is commonly connected to the second liquid storage cup 219 .

In a preferred embodiment, the first valve 204 to the fifth valve 216 may comprise diaphragm valves. But not limited to this.

In a preferred embodiment, a first sealing ring 201 may be provided on the lower end of the first needle 202 , and a second sealing ring 221 may be provided on the lower end of the second needle 220 . When the first needle 202 and the second needle 220 are driven to engage with the first liquid injection hole 101 and the second liquid injection hole 103 on the battery 10 respectively, the first sealing ring 201 and the second sealing ring 221 can be used to make the second The first needle 202 and the second needle 220 form a sealed joint with the first liquid injection hole 101 and the second liquid injection hole 103 to avoid liquid leakage and effectively ensure the internal pressure of the battery 10 during liquid injection and standing meet the requirements.

The liquid injection mechanism 20 can be arranged above a rotating platform, for example above the turntable type liquid injection production line 30 shown in FIG. 2 . Wherein, the turntable type liquid injection production line 30 is provided with a turntable 301, and the turntable 301 has a rotation center. On the turntable 301, according to the rotation direction of the turntable 301, a battery loading station 3001, a liquid injection station 3002, one or more alternate static stations 3003 and a discharging station 3004 can be arranged in sequence.

When the battery 10 is sequentially transferred from the feeding station 3001 to the liquid injection station 3002 and the alternate static station 3003 along the rotation center of the turntable 301, the first valve 204 to the fifth valve 216 are opened and closed differently. Combined, to inject the electrolyte solution into the battery 10 under negative pressure, and perform vacuuming and pressurization on the inside of the battery 10 through the first liquid injection hole 101 and the second liquid injection hole 103, so that the electrolyte solution is in the first liquid injection hole 103. A reciprocating movement is formed inside the battery 10 between the hole 101 and the second liquid injection hole 103 to accelerate the absorption efficiency of the electrolyte.

Further, by performing different combinations of opening and closing the first valve 204 to the fifth valve 216, it may specifically include:

When the battery 10 is on the feeding station 3001 before the liquid injection, by opening the second valve 210, and closing the first valve 204, the third valve 208 to the fifth valve 216, the battery can be charged through the first liquid injection hole 101. 10 Vacuum inside.

When the battery 10 is on the liquid injection station 3002 during liquid injection, the first valve 204 is opened, and the second valve 210 to the fifth valve 216 are closed to pass through the first liquid injection hole 101 and use the pressure difference to charge the battery 10. Electrolyte is injected inside.

After filling, open the third valve 208 and close the first valve 204 to the second valve 210 and the fourth valve 214 to the fifth valve 216 to pressurize the inside of the battery 10 through the first liquid injection hole 101 .

When the battery 10 is on the alternate stationary station 3003 when standing still, at first the fourth valve 214 is opened, and the first valve 204 to the third valve 208 and the fifth valve 216 are closed to pass through the second liquid injection hole. 103 to evacuate the interior of the battery 10; then, by opening the fifth valve 216, and closing the first valve 204 to four valves, to pressurize the interior of the battery 10 through the second liquid injection hole 103; then, by opening the second valve 210 , and close the first valve 204, the third valve 208 to the fifth valve 216 to evacuate the interior of the battery 10 through the first liquid injection hole 101; after that, by opening the third valve 208, and closing the first valve 204 to the fifth valve The second valve 210 and the fourth valve 214 to the fifth valve 216 are used to pressurize the inside of the battery 10 through the first liquid injection hole 101 .

In the present invention, by connecting the first needle 202 and the second needle 220 to the vacuum source 212 and the dry gas source 217 respectively, the battery 10 can be evacuated and pressurized through the first needle 202 or the second needle 220 respectively, and the electrolyte solution can be realized. Reciprocating movement inside the battery 10 between the first liquid injection hole 101 and the second liquid injection hole 103 . The present invention also arranges the first liquid storage cup 203 and the second liquid storage cup 219 on the first needle head 202 and the second needle head 220 respectively, which can prevent the liquid from the first liquid injection hole 101 or the second liquid injection hole 103 due to vacuuming. The sucked part of the electrolyte is buffered to prevent the electrolyte from flowing back to the vacuum source 212 . The present invention also sets the first valve 204 to the fifth valve 216 and performs different combinations of opening and closing the first valve 204 to the fifth valve 216 to control the injection of the electrolyte solution into the battery 10 under negative pressure, and to control the flow through The first liquid injection hole 101 and the second liquid injection hole 103 respectively perform vacuuming and pressurization on the inside of the battery 10, and control the electrolyte to form inside the battery 10 between the first liquid injection hole 101 and the second liquid injection hole 103. Reciprocating motion realizes accelerated electrolyte absorption efficiency.

Refer to Figure 2. A lithium battery liquid injection production equipment of the present invention may include the above-mentioned lithium battery liquid injection mechanism 20 (not shown) arranged on a turntable liquid injection production line 30 , and a circulation production line 40 .

Among them, the turntable type liquid injection production line 30 is provided with a turntable 301, and the turntable 301 is sequentially provided with a battery feeding station 3001, a liquid injection station 3002, one or more alternate static stations 3003 and a lower station according to the rotation direction of the turntable 301. Material station 3004. For example, as shown in the figure, three alternate stationary stations 3003 are provided. But not limited to this. Each station is used to load the battery 10 respectively, and the battery 10 is sequentially circulated among the stations through the rotation of the turntable 301 . The liquid injection mechanism 20 is arranged one by one above each station of the turntable 301, and is driven to rotate synchronously and lift on each station, so that the first needle head 202 and the second needle head 220 are positioned at the material loading worker by descending. The first liquid injection hole 101 and the second liquid injection hole 103 on the battery 10 on the position 3001 are respectively sealed and engaged, or when the battery 10 is rotated to the unloading station 3004, the first needle 202 and the first needle 202 are lifted by rising. The second needle 220 is separated from the first liquid injection hole 101 and the second liquid injection hole 103 .

During the process of synchronous rotation with the battery 10, the liquid injection mechanism 20 performs the above-mentioned liquid injection and resting of the battery 10, including performing different combinations of the above-mentioned opening and closing of the first valve 204 to the fifth valve 216, so as to operate under negative pressure. The electrolyte is injected into the battery 10, and the inside of the battery 10 is vacuumed and pressurized through the first liquid injection hole 101 and the second liquid injection hole 103, so that the electrolyte is in the first liquid injection hole 101 and the second liquid injection hole. The inside of the battery 10 between the holes 103 forms a reciprocating motion to accelerate the absorption efficiency of the electrolyte.

The circulation production line 40 is located on the side of the turntable liquid injection production line 30, which can be successively equipped with a battery incoming station 401, a hipot insulation test station 402, a weighing and scanning station before liquid injection 403, a fixture buffer station 404, and a fixture Dismantling station 405, code scanning and weighing station 406 after liquid injection, post-processing station 407, and discharging and loading station 408.

Wherein, there is also a fixture loading station 409 between the fixture buffering station 404 and the loading station 3001 on the turntable liquid injection production line 30 . In addition, the battery 10 is connected between the pre-injection weighing and code scanning station 403 and the jig loading station 409 through the manipulator 50 .

Insulation test station 402, pre-injection weighing and scanning station 403, post-injection weighing and weighing station 406, and post-processing station 407 are also equipped with defective product NG buffer station 410.

Each of the above-mentioned workstations is equipped with corresponding operating equipment, and the transfer of batteries and fixtures can be carried out through the transmission line.

The above-mentioned lithium battery liquid injection production equipment of the present invention can test the insulation performance of the incoming battery 10 one by one by setting the insulation test station 402, which is conducive to improving the safety of the battery; by setting the code scanning station 403 before liquid injection, Scan code weighing station 406 after liquid injection can scan and weigh batteries one by one before and after, so as to achieve closed-loop management of the production cycle of the battery liquid injection process, which is conducive to improving battery quality; by setting up a turntable liquid injection production line 30, After the battery 10 is injected and distributed alternately, the liquid absorption efficiency of the battery and the consistency of the liquid injection volume of the battery can be effectively improved, and the forming quality of the battery 10 is guaranteed, and the production cycle of the overall battery manufacturing is shortened.

Moreover, the above-mentioned lithium battery liquid injection production equipment of the present invention can ensure the accuracy of battery liquid injection, reduce the risk of liquid leakage, and can greatly reduce the risk of battery deformation, which is also conducive to improving the safety of the battery, and the equipment can be realized simply and efficiently. Continuous production and processing of liquid injection for lithium batteries.

The battery produced by using the lithium battery liquid injection production equipment of the present invention has good quality, which is beneficial to improving the energy density and safety of the battery.

Refer to Figure 3. A lithium battery liquid injection production method of the present invention can use the above lithium battery liquid injection production equipment for battery liquid injection. A kind of lithium battery liquid injection production method of the present invention may comprise the following steps:

Step S100: incoming battery material.

Firstly, the incoming battery to be filled is provided to the battery incoming station 401 . Wherein, two liquid injection holes, ie, a first liquid injection hole 101 and a second liquid injection hole 103 , are provided on opposite ends of the top surface of the battery 10 . The first liquid injection hole 101 and the second liquid injection hole 103 can be respectively located on the outer positions of the two poles 102 of the battery 10 (refer to FIG. 1 ).

It should be understood that, in the embodiment of the present invention, the first obtained battery 10 should be a battery that has passed the water content test.

The water content test requirement of the battery 10 is, for example, water content≤500ppm. A water content of ≤ 200 ppm is preferred.

The batteries 10 can be loaded on trays or fixtures for circulation, and a single battery 10 can also be circulated by manipulators or other auxiliary mechanisms.

Step S200: insulation test.

It should be understood that, in the embodiment of the present invention, the raw battery 10 is firstly positioned at the insulation testing station 402, and the specific positioning methods may include various conventional methods. Then, a tester can be used to conduct insulation tests on the poles 102 of the battery 10 respectively. The test requirement is, for example, insulation resistance ≤ 25mΩ. Preferably, the insulation resistance is ≤20mΩ.

Bad cells can be diverted to NG cache station 410. Bad batteries are dealt with in a unified manner as required; and the insulation test data of single batteries can be uploaded to the traceability system in real time and managed centrally by the system.

Step S300: Scan the code before weighing.

It should be understood that, in the embodiment of the present invention, the code scanning station 403 scans and weighs the body of the battery 10 before the liquid injection, so as to obtain the corresponding data of the battery 10 before the liquid injection. , and the data can be uploaded to the traceability system for centralized management, and the current state of the battery 10 can also be identified and judged when scanning the code. By setting up the NG cache station 410, defective products can be removed to the NG cache station 410, eliminating the risk of bad circulation.

Before the battery 10 is weighed, the weight range of the battery 10 can be set, that is, the standard range of the battery 10 weight can be defined. This range can be obtained according to the battery design and the standard deviation of battery sampling, for example, the weight judgment range can be ≤±2%, preferably ±1%. By setting up the NG cache station 410, defective products can be removed to the NG cache station 410, eliminating the risk of bad circulation.

Step S400: Putting the battery into the jig and loading it into a tray.

It should be understood that, in the embodiment of the present invention, the weighed battery 10 is firstly packed into a tray. Through the equipped empty jig buffer station 404 , when loading materials, the empty jig is first transferred to the jig loading station 409 . Then drive the two splints of the fixture to push away. Then the battery 10 is put into the fixture by the manipulator 50 . The top-opening driving mode of the fixture splint can be selected from motor, cylinder, cam, etc. The fixture can be designed in one piece, and the splints on both sides can be connected by tension springs, and the bottom of the fixture can be equipped with positioning pins, so that the transfer process can be quickly and accurately positioned.

The fixture cache station 404 is equipped with a small number of empty fixtures, preferably one for use and one for standby.

Then the battery is loaded, the order and position of battery loading and the corresponding relationship with the fixture can be memorized and bound by the program control of the liquid injection machine to achieve a one-to-one traceability effect. After the battery 10 is loaded into the tray, the jig is transferred to the loading station 3001 of the turntable 301 as a whole, that is, the battery 10 to be filled is arranged on the loading station 3001 .

Step S500: Inject liquid into the battery.

It should be understood that, in the embodiment of the present invention, firstly, after the battery 10 loaded on the tray is transferred to the loading station 3001, the liquid injection machine confirms that there is the battery 10 in the jig, and starts the liquid injection procedure. The execution of the liquid injection program may specifically include the following steps:

Step S5001: evacuate the interior of the battery 10 to a first vacuum degree through the first liquid injection hole 101, and keep it for a first time.

When the battery 10 is located on the loading station 3001 of the turntable 301, it is driven to lower the first needle 202 and the second needle 220 of the liquid injection mechanism 20, and the first needle 202 passes through the first sealing ring 201 and the first liquid injection. The hole 101 is press-fitted, and the second needle 220 is press-fitted with the second liquid injection hole 103 through the second sealing ring 221 . Next, the second valve 210 on the first vacuum pipeline 211 is opened, and the other valves are closed. Then, vacuumize the battery 10 in the jig. The air inside the cavity of the battery 10 is pumped out through the first needle 202 to ensure that the inside of the battery 10 is in a vacuum environment, and the vacuum is evacuated to a degree of <-95kPa, and kept for 5s, and then the first valve 204 is closed.

Step S5002: Inject the electrolyte solution into the battery 10 through the first liquid injection hole 101 using the pressure difference, and the injection time is the second time.

When the liquid injection mechanism 20 rotates synchronously with the turntable 301 from the loading station 3001 to the liquid injection station 3002 , the first valve 204 is opened, and the other valves are closed, and the liquid injection is performed by the liquid injection pump 206 . The liquid is injected into the battery 10 on the fixture from the first liquid storage cup 203 through the first needle 202 and the first liquid injection hole 101 , and the liquid is injected using the pressure difference. The liquid injection time may be, for example, 30 s to 1 min, and the specific time may be adjusted according to the liquid injection volume.

Step S5003: pressurize the interior of the battery 10 to a first pressure through the first liquid injection hole 101, and keep it for a third time.

Open the third valve 208 and close the rest of the valves, pass dry gas or inert gas or nitrogen and other low dew point gas into the battery 10 through the first liquid injection hole 101 to 200kpa, and keep it for 10-60s, then close the third valve. Valve 208.

Step S5004: Release the pressure of the battery 10 to normal pressure.

Since the liquid injection turntable 301 is designed with multiple stations, the above-mentioned overall liquid injection process can be decomposed to reduce waiting time. That is, when the turntable 301 is in operation, other mechanisms can operate synchronously without interfering with each other. Moreover, the turntable 301 can reserve a certain pause time at each station to ensure that the actions of each mechanism or station are coordinated and coordinated, and the action of the liquid injection program is decomposed and completed through the feeding station 3001 and the liquid injection station 3002 , thereby improving the injection efficiency.

Step S600: Stand still alternately.

It should be understood that, in the embodiment of the present invention, firstly, through the rotation of the turntable 301, the battery 10 that has been filled with liquid is moved from the liquid injection station 3002 to the alternate static station 3003, and the distributed alternate static is carried out, that is, Start the standstill program. Alternate standing can include the following steps:

Step S6001: evacuate the interior of the battery 10 to a second vacuum degree through the second liquid injection hole 103, and keep it for a fourth time.

Continue to transfer the battery 10 and the liquid injection mechanism 20 to the alternate static station 3003 synchronously. During the standing process, the fourth valve 214 on the second vacuum pipeline 213 is opened, and the other valves are closed. Then, vacuumize the battery 10 in the jig. The gas inside the cavity of the battery 10 is pumped out through the second needle 220 to ensure that the inside of the battery 10 is a vacuum environment, and the vacuum is evacuated to a degree of <-80kpa, and kept for 10s-60s, and then the fourth valve 214 is closed.

Step S6002: continue to pressurize the inside of the battery 10 to the second pressure through the second liquid injection hole 103, and keep it for a fifth time.

The fifth valve 216 is opened and the other valves are closed. Through the second liquid injection hole 103 , dry gas or inert gas or low dew point gas such as nitrogen is introduced into the battery 10 to 200 kPa, and kept for 10-60 seconds, and then the fifth valve 216 .

Step S6003: evacuate the interior of the battery 10 to a third vacuum degree through the first liquid injection hole 101, and keep it for a sixth time.

Open the second valve 210 and close the other valves. Then, vacuumize the battery 10 in the jig. The air inside the cavity of the battery 10 is pumped out through the first needle 202 to ensure that the inside of the battery 10 is in a vacuum environment, and the vacuum is evacuated to a degree of <-80kpa, and kept for 10s-60s; then the second valve 210 is closed.

Step S6004: continue to pressurize the inside of the battery 10 to the third pressure through the first liquid injection hole 101, and maintain it for a seventh time.

Open the third valve 208 and close the rest of the valves, pass dry gas or inert gas or nitrogen and other low dew point gas into the battery 10 through the first liquid injection hole 101 to 200kpa, and keep it for 10-60s, then close the third valve. Valve 208.

The above step S6001 to step S6004 may be cyclically executed one or more times. Wherein, the number and time of alternate cycles can be adjusted according to the capacity of the battery 10 , the liquid injection volume and the composition of the battery 10 . In this way, when the electrolyte circulates back and forth inside the battery 10 between the first liquid injection hole 101 and the second liquid injection hole 103 , the absorption efficiency of the electrolyte can be accelerated.

Step S6005: after the standing still, the battery 10 is transferred to the unloading station 3004, and the pressure of the battery 10 can be released to normal pressure by raising the liquid injection mechanism 20 .

Since the liquid injection turntable 301 is designed with multiple stations, the above-mentioned overall standing process can be decomposed to reduce the waiting time. That is, when the turntable 301 is in operation, other mechanisms can operate synchronously without interfering with each other. Moreover, the turntable 301 can reserve a certain pause time at each station to ensure that the actions of each mechanism or station are coordinated and coordinated, and the resting program action is decomposed and completed through three alternate resting stations 3003, thereby Improve the liquid absorption efficiency of the battery 10 .

In a preferred embodiment, the first vacuum degree is set to be greater than the second vacuum degree and the third vacuum degree, so that a relatively larger negative pressure state is formed inside the battery 10 before liquid injection, and the injection speed of the electrolyte is promoted, And prevent the electrolyte solution from overflowing from the battery 10 in a large amount when flowing after injection.

In a preferred embodiment, the first pressure, the second pressure and the third pressure are set to be equal, so that the electrolyte in different stages can form a uniform flow inside the battery 10 .

In an optional embodiment, the method for pressurizing the interior of the battery includes passing dry inert gas or nitrogen into the interior of the battery 10 through the first liquid injection hole 101 or the second liquid injection hole 103, which can ensure that the interior of the battery 10 is always It is in a state where the water content reaches the standard, and effectively prevents unexpected reactions from occurring, ensuring the safety of injection production.

Step S700: The battery 10 is removed.

It should be understood that, in the embodiment of the present invention, firstly, the turntable 301 is rotated to the unloading station 3004, and the battery 10 that has been filled with liquid and left still is unloaded, and then transferred to the fixture dismantling station 405 to unload the battery 10. To disassemble. The order and position of battery 10 blanking and the corresponding relationship with the fixture can be memorized and bound by the program control of the liquid injection machine to achieve a one-to-one traceability effect. After the battery 10 is disassembled, it is transferred to the code scanning and weighing station 406 after liquid injection, and the empty fixture is transferred to the fixture buffer station 404 as a whole.

Step S800: Post-scanning and weighing.

It should be understood that, in the embodiment of the present invention, firstly, the code scanning and weighing station 406 scans the code and weighs the battery 10 body after liquid injection, so as to obtain the corresponding data after the liquid injection of the battery 10, which is automatically performed by the system. Judgment, and upload the data to the traceability system for centralized management. Moreover, when scanning the code, the current state of the battery 10 can also be identified and judged. Through the NG cache station 410, defective products can be removed to the NG cache station 410, eliminating the risk of bad circulation.

In addition, before the battery 10 is weighed, the weight range of the battery 10 can be set, that is, the standard range of the battery 10 weight can be defined. The range can be obtained according to the design of the battery 10 and the standard deviation of the battery 10 sampling, for example, the weight determination range can be ≤±2%, preferably ±1%. By setting up the NG cache station 410, defective products can be removed to the NG cache station 410, eliminating the risk of bad circulation, and achieving closed-loop management of the battery 10 cell cycle in the liquid injection process.

Step S900: post-sealing treatment.

It should be understood that, in the embodiment of the present invention, the first liquid injection hole 101 and the second liquid injection hole 103 on the battery 10 body are firstly sealed at the post-processing station 407 . The sealing method may include rubber plugging, sticking tape or other sealing methods to ensure the sealed state of the battery 10 after leaving the liquid injection machine.

Step S1000: discharging and loading into trays.

It should be understood that, in the embodiment of the present invention, the batteries 10 after the sealing treatment are firstly packed into trays at the tray loading station 408 . Or it can be flowed as a single unit. According to the feeding method of the next process, the material transfer between the processes is seamlessly connected, and the overall production of the battery 10 is improved smoothly.

In the present invention, double liquid injection holes are provided on the battery 10 so that the flow of the injected electrolyte can be controlled by pressure between the two liquid injection holes, so as to realize the full coverage of the electrolyte inside the battery 10; The production line 30 can evacuate the inside of the battery 10, and use the formed negative pressure to quickly inject the electrolyte into the battery 10, shorten the injection time, and further pressurize, so that the injected electrolyte can quickly penetrate into the entire battery 10 and, during the standing process of the battery 10, by utilizing the first liquid injection hole 101 and the second liquid injection hole 103 to perform vacuuming and pressurization respectively on the inside of the battery 10, the electrolyte solution injected into the battery 10 is in the first The interior of the battery 10 between the liquid injection hole 101 and the second liquid injection hole 103 forms a reciprocating motion, so as to accelerate the absorption efficiency of the electrolyte.

Therefore, the above method can ensure the accuracy of battery liquid injection, speed up battery liquid absorption efficiency, improve battery quality, reduce the risk of liquid leakage, and can greatly reduce the risk of battery deformation, and is also conducive to improving the safety of the battery, and the method can be easily and efficiently Realize the continuous production and processing of lithium battery liquid injection; at the same time, this method can also ensure the quality of the incoming battery before liquid injection, and can confirm the liquid injection effect of the battery, and ensure the sealing state of the battery after liquid injection; it can also make the battery and A one-to-one traceable relationship is formed between the fixtures to realize closed-loop management of the state of the battery.

Although the embodiments of the present invention have been described in detail above, it will be apparent to those skilled in the art that various modifications and changes can be made to the embodiments. However, it should be understood that such modifications and changes are within the scope and spirit of the invention as defined in the claims. Furthermore, the invention described herein is capable of other embodiments and of being practiced or carried out in various ways.

Claims (6)

1. The lithium battery injection production method is characterized by comprising the following steps of:

step one: arranging a battery to be injected on a feeding station, vacuumizing the interior of the battery to a first vacuum degree through a first injection hole formed in the top surface of the battery, and keeping for a first time;

Step two: the battery is rotated onto a liquid injection station along the rotation center, continuously passes through the first liquid injection hole, and electrolyte is injected into the battery by utilizing pressure difference, wherein the liquid injection time is second time;

step three: pressurizing the interior of the battery to a first pressure through the first liquid injection hole, maintaining for a third time, and then decompressing the battery to normal pressure;

step four: continuously turning the battery to a standing station, vacuumizing the interior of the battery to a second vacuum degree through a second liquid injection hole which is arranged on the battery and is opposite to the first liquid injection hole in the standing process, and keeping for a fourth time;

step five: continuing to pressurize the interior of the battery to a second pressure through the second liquid injection hole and maintaining for a fifth time;

step six: vacuumizing the battery to a third vacuum degree through the first liquid injection hole, and keeping the sixth time;

step seven: continuing to pressurize the interior of the battery to a third pressure through the first liquid injection hole and maintaining for a seventh time;

step eight: continuously transferring the battery to a blanking station, and decompressing the battery to normal pressure;

the first liquid injection hole and the second liquid injection hole are used for respectively vacuumizing and pressurizing the inside of the battery, so that electrolyte injected into the battery forms reciprocating motion in the battery between the first liquid injection hole and the second liquid injection hole, and the absorption efficiency of the electrolyte is accelerated;

Performing one or more times of the steps four to seven in a circulating way;

the first vacuum degree is greater than the second vacuum degree and the third vacuum degree;

the first pressure, the second pressure, and the third pressure are equal.

2. The method for producing a lithium battery injection liquid according to claim 1, further comprising the following steps before the first step:

performing an insulation test on the battery;

weighing the battery before filling the liquid;

performing clamp loading on the battery;

the eighth step further comprises the following steps:

performing disketting on the battery;

weighing the battery after filling the liquid;

sealing the first liquid injection hole and the second liquid injection hole; and

and carrying out discharging and dishing on the battery.

3. The utility model provides a lithium cell annotates liquid mechanism which characterized in that includes:

the first needle head and the second needle head are used for being driven to be respectively connected with a first liquid injection hole and a second liquid injection hole which are arranged at two opposite ends of the top surface of the battery to be injected; the first needle is respectively connected with a liquid injection pipeline, a first vacuum pipeline and a first drying gas pipeline through a first liquid storage cup, the second needle is respectively connected with a second vacuum pipeline and a second drying gas pipeline through a second liquid storage cup, the liquid injection pipeline is connected to a liquid injection pump, the first vacuum pipeline and the second vacuum pipeline are connected to a vacuum source, the first drying gas pipeline and the second drying gas pipeline are connected to a drying gas source, a first valve is arranged on the liquid injection pipeline, a second valve is arranged on the first vacuum pipeline, a third valve is arranged on the first drying gas pipeline, a fourth valve is arranged on the second vacuum pipeline, and a fifth valve is arranged on the second drying gas pipeline;

When the battery sequentially rotates from a feeding station to a liquid injection station and a standing station along the rotation center, electrolyte is injected into the battery under negative pressure by executing different combinations of opening and closing on the first valve to the fifth valve, and vacuumizing and pressurizing are respectively executed on the battery through the first liquid injection hole and the second liquid injection hole, so that the electrolyte forms reciprocating motion in the battery between the first liquid injection hole and the second liquid injection hole, and the absorption efficiency of the electrolyte is accelerated;

the different combinations of opening and closing by performing on the first valve to the fifth valve include:

when the battery is positioned on the feeding station, the second valve is opened, and the first valve, the third valve and the fifth valve are closed, so that the interior of the battery is vacuumized through the first liquid injection hole;

when the battery is positioned on the liquid injection station, electrolyte is injected into the battery through the first liquid injection hole by opening the first valve and closing the second valve to the fifth valve by utilizing the pressure difference;

after the liquid is injected, the third valve is opened, and the first valve, the second valve, the fourth valve, the fifth valve are closed, so that the inside of the battery is pressurized through the first liquid injection hole;

When the battery is positioned on the standing station, firstly, vacuumizing the interior of the battery through the second liquid injection hole by opening the fourth valve and closing the first valve to the third valve and the fifth valve; then, the fifth valve is opened, and the first valve is closed to the four valves, so that the interior of the battery is pressurized through the second liquid injection hole; then, the second valve is opened, and the first valve, the third valve and the fifth valve are closed, so that the inside of the battery is vacuumized through the first liquid injection hole; and then, opening the third valve, and closing the first valve to the second valve and the fourth valve to the fifth valve to pressurize the inside of the battery through the first liquid injection hole.

4. A lithium battery liquid injection production device, comprising the lithium battery liquid injection mechanism of claim 3.

5. The lithium battery injection liquid production device according to claim 4, further comprising:

the rotary table type liquid injection production line is provided with a battery feeding station, a liquid injection station, one to a plurality of standing stations and a discharging station in turn according to the rotary table rotation direction, wherein each station is respectively used for loading the battery, the battery is sequentially circulated among the stations through the rotation of the rotary table, the liquid injection mechanism is arranged above the stations of the rotary table in a one-to-one correspondence manner and driven to synchronously rotate and lift so as to be respectively and hermetically jointed with the first liquid injection hole and the second liquid injection hole on the battery on the feeding station and to be separated from the first liquid injection hole and the second liquid injection hole on the discharging station.

6. The lithium battery injection liquid production device according to claim 5, further comprising:

the circulation production line is positioned at one side of the rotary disc type liquid injection production line and is sequentially provided with a battery incoming material station, an insulation test station, a liquid injection front weighing station, a clamp buffer station, a clamp tray disassembling station, a liquid injection rear weighing station, a post-treatment station and a discharging tray loading station;

the device comprises a charging station, an insulating test station, a liquid injection front weighing station, a liquid injection rear weighing station, a post-treatment station and a defective product buffer station, wherein the clamp buffer station is further arranged between the clamp buffer station and the charging station, the defective product buffer station is further arranged on one side of the insulating test station, the liquid injection front weighing station, the liquid injection rear weighing station and the post-treatment station, and the battery is connected between the liquid injection front weighing station and the clamp tray station through a manipulator.

Images