CN111540876A - A lithium ion pole piece battery pack injection and opening activation device - Google Patents

Abstract

The invention discloses a lithium ion pole piece battery pack liquid injection and opening activation device which comprises a first pressurizing mould, a pressurizer, an air inlet and an air outlet, a first pressure tank shell, a liquid level sensor, a sealing clamping piece, a direct current power supply integrated control box, a second pressure tank shell, a heat medium inlet and outlet pipe, an electrolyte inlet and outlet, a temperature sensor, a refrigerant inlet and outlet pipe, a second pressurizing mould and a gas pressure sensor. The device aims at the lithium ion pole piece capacity unit after stacking and welding, and is not a single battery core in the traditional process, a closed protective gas environment with controllable environmental conditions such as temperature, air pressure and the like is provided through structural design, liquid injection and opening activation are carried out on the battery pack, closed packaging is carried out after the process, a finished product battery pack is formed, and the problem that no lithium ion pole piece battery pack liquid injection and opening activation device exists in the prior art is solved.

Description

A lithium ion pole piece battery pack injection and opening activation device

technical field

The invention relates to the technical field of lithium batteries, in particular to a liquid filling and opening activation device for a lithium ion pole piece battery pack.

Background technique

With the promotion and application of new energy vehicles and 5G technology, smart society has entered people's daily life, and the demand for off-grid energy storage power is increasing in quantity and quality. As an energy storage device, the safety, service life and life-cycle cost of batteries have attracted much attention. The problems of liquid leakage, ignition, attenuation, low energy density and high cost exposed by liquid lithium-ion batteries have all become important bottlenecks in their applications.

The ultimate application of battery products, especially power supply and energy storage power supply, is battery pack. At present, the production of battery packs is divided into the process of cell production, cell grouping, and mold forming PACK. The production of cells is divided into mixing, coating, rolling, drying, lamination, liquid injection, and chemical formation. , sealing, aging, volume distribution, sorting and other steps. The liquid injection and activation steps in the existing battery pack preparation process are aimed at single cells. The preparation of single cell is divided into two types: one is the single cell encapsulated by aluminum plastic film, which needs to undergo pre-sealing, vacuum injection, sealing, activation and secondary sealing; since gas will be generated during the activation process, so The liquid injection activation packaging process of the cell is cumbersome and requires multiple packaging. The second is the single cell encapsulated in the steel shell. Due to the structural strength of the steel shell itself, vacuuming, electrolyte injection, and opening activation are generally used. Finally, the packaging is completed. After the liquid injection is completed, the opening is activated, and it is necessary to control the environment. Water oxygen value, etc., the steps are cumbersome and difficult. The traditional activation method causes the inconsistency of the single cell, resulting in the shortcomings of low grouping rate of the single cell, low production efficiency and high manufacturing cost. After the single cells are prepared by processes such as liquid injection and activation, after aging, capacity separation, and sorting, the single cells are assembled in series and parallel through the connectors to form a module, and then the modules are assembled into a finished battery through the connectors. Bag.

SUMMARY OF THE INVENTION

In view of the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a liquid injection and opening activation device for a lithium ion pole piece battery pack.

The technical solution of the present invention to solve the technical problem is to provide a lithium ion pole piece battery pack liquid injection and opening activation device, which is characterized in that the device includes a pressurizing mold 1, a pressurizer, an air inlet and outlet, and a pressure tank shell 1. Liquid level sensor, sealing clamp, integrated control box for DC power supply, pressure tank shell ;

The pressure tank shell 1 and the pressure tank shell 2 are connected by a sealing clamp to form a detachable pressure tank; the pressure mold 1 and the pressure mold 2 are placed inside the pressure tank; the pressurizer is set On the outer wall of the pressure tank, its output end extends into the inside of the pressure tank and is in contact with one of the pressure mold 1 and the pressure mold 2 for applying pressure; the other of the pressure mold 1 and the pressure mold 2 is set On the inner wall of the pressure tank, the inner wall is located on the opposite side of the pressurizer; the lithium-ion pole piece battery pack to be activated by injection is placed between the pressurizing die 1 and the pressurizing die 2, and the pressure is realized by the pressurization of the pressurizer. Clamping or clamping the battery pack between the first die and the second pressurizing die; the liquid level sensor is arranged on the inner wall of the pressure tank, above the battery pack, and is used to measure the liquid level of the electrolyte in the pressure tank; The top is provided with a transparent air inlet and outlet, which is located above the liquid level sensor, which is used to realize the vacuuming of the pressure tank and the introduction of protective gas to form a specific air pressure; the bottom of the pressure tank is provided with a transparent electrolyte inlet and outlet. It is used for the introduction and discharge of electrolyte; the gas pressure sensor is arranged on the inner wall of the pressure tank, above the liquid level sensor, to measure the ambient vacuum and the ambient air pressure after the protective gas is introduced;

The heating medium inlet and outlet pipes and the refrigerant inlet and outlet pipes are used to provide a hot and cold environment for the battery pack; the temperature sensor is arranged inside the pressure tank to measure the ambient temperature of the battery pack in the pressure tank and the temperature of the battery pack itself.

Compared with the prior art, the beneficial effects of the present invention are:

(1) The device provides a closed protective gas environment with controllable environmental conditions such as temperature and air pressure through structural design for the stacked and welded lithium-ion pole piece capacity units, rather than the single cell in the traditional process. , perform liquid injection and opening activation on the battery pack, and then carry out airtight packaging after this process to form a finished battery pack, which solves the problem that there is no lithium ion pole piece battery pack liquid injection and opening activation device in the prior art.

(2) The use of this device shortens the production process of the battery pack, does not need to divide the capacity and group, and the environment is controllable. The same environment and process flow between the cells greatly improves the consistency of the battery, improves the production efficiency, and reduces the manufacturing cost. .

Description of drawings

1 is an internal schematic diagram of the overall structure of the device according to an embodiment of the present invention;

2 is an internal schematic diagram of the overall structure of a lithium-ion pole piece battery pack to be activated by liquid injection according to an embodiment of the present invention;

In the picture: 1. Lithium-ion pole piece battery pack to be activated by liquid injection; 2. Pressurized mold 1; 3. Pressurizer; 4. Air inlet and outlet; 5. Pressure tank shell 1; 6. Liquid level sensor; 7. Sealing and clamping parts; 8. DC power integrated control box; 9. Voltage collection wiring harness; 10. Positive bus; 11. Pressure tank shell 2; 12. Heat medium inlet and outlet pipes; 13. Electrolyte inlet and outlet; 14. Temperature Sensor; 15. Refrigerant inlet and outlet pipe; 16. Pressure tank base; 17. Pressurized mold II; 18. Gas pressure sensor; 19. Negative bus.

Detailed ways

Specific embodiments of the present invention are given below. The specific embodiments are only used to further illustrate the present invention in detail, and do not limit the protection scope of the claims of the present application.

The present invention provides a lithium-ion pole piece battery pack liquid injection and opening activation device (referred to as the device, see FIG. 1 ), which is characterized in that the device includes a pressurizing die 2, a pressurizer 3, an air inlet and outlet 4, and a pressure tank. Shell one 5, liquid level sensor 6, sealing clamp 7, DC power integrated control box 8, pressure tank shell two 11, heating medium inlet and outlet pipe 12, electrolyte inlet and outlet 13, temperature sensor 14, refrigerant inlet and outlet Tube 15, pressurizing die two 17 and gas pressure sensor 18;

The pressure tank shell 1 5 and the pressure tank shell 2 11 are closed and sealed through the sealing clamp 7 to form a detachable pressure tank; the pressure mold 1 2 and the pressure mold 2 17 are placed inside the pressure tank. The pressurizer 3 is arranged on the outer wall of the pressure tank, and its output end extends into the inside of the pressure tank, and contacts with one of the pressurizing die one 2 and the pressurizing die two 17, for applying pressure, the pressure of the pressurizer 3 Can be set; the other one of the pressurizing die one 2 and the pressurizing die two 17 is arranged on the inner wall of the pressure tank, and this inner wall is located on the opposite side of the pressurizer 3 (this embodiment is that the pressurizer 3 is arranged on the top of the pressure tank On the outer wall of the pressure tank, its output end extends into the pressure tank and is in contact with the pressure mold one 2; the pressure mold two 17 is fixed on the inner wall of the bottom of the pressure tank); the lithium ion pole piece battery pack (referred to as the battery pack for short) is activated by liquid injection ) 1 is placed between the pressurizing die one 2 and the pressurizing die two 17, and the clamping or clamping of the battery pack 1 by the pressurizing die one 2 and the pressurizing die two 17 is realized by the pressurization of the pressurizer 3; The position sensor 6 is arranged on the inner wall of the pressure tank, above the battery pack 1, and is used to measure the liquid level of the electrolyte in the pressure tank so that the electrolyte can completely immerse the battery pack 1 and judge whether the injection is completed; the top of the pressure tank A transparent air inlet and outlet 4 is provided, which is located above the liquid level sensor 6, and is used to realize the vacuuming of the gas in the pressure tank and the introduction of protective gases such as nitrogen (preferably inert gas) to form a specific air pressure; the bottom of the pressure tank is provided with The transparent electrolyte inlet and outlet 13 are used for the introduction and discharge of the electrolyte; the gas pressure sensor 18 is arranged on the inner wall of the pressure tank, above the liquid level sensor 6, and is used to measure the environmental vacuum degree and the protection of the access. The ambient air pressure after the gas;

The heating medium inlet and outlet pipes 12 and the refrigerant inlet and outlet pipes 15 are used to provide a hot and cold environment for the battery pack 1, cooling or heating (in Example 1, the heating medium inlet and outlet pipes 12 and the refrigerant inlet and outlet pipes 15 pass through the shell of the pressure tank. , the ends are located in one or both of the pressure mold one 2 and the pressure mold two 17; the embodiment 2 is that the ends of the heat medium inlet and outlet pipes 12 and the refrigerant inlet and outlet pipes 15 are located in the pressure tank shell one 5 and the pressure tank shell In one or both of the two bodies 11; Embodiment 3 is in the temperature regulation pipeline inside the pressure tank at the end of the heating medium inlet and outlet pipe 12 and the refrigerant inlet and outlet pipe 15, and the temperature regulation pipeline is arranged outside the battery pack 1); The temperature sensor 14 is arranged inside the pressure tank and is used to measure the ambient temperature of the battery pack 1 in the pressure tank and the temperature of the battery pack 1 itself;

Preferably, the device further includes a pressure tank base 16; the pressure tank base 16 is arranged at the bottom of the pressure tank, and is used for adjusting the levelness and stably supporting the pressure tank.

The lithium-ion pole piece battery pack 1 to be activated by liquid injection has a voltage collection harness 9, a positive bus 10 and a negative bus 19; the DC power integrated control box 8 is communicated with the battery pack 1 through the voltage collection harness 9, the positive bus 10 and the negative bus 19, The battery pack 1 is charged and discharged by the positive bus 10 and the negative bus 19, and the voltage and other data are collected through the voltage collection wire harness 9; the voltage collection wire harness 9 is located on the side of the battery pack 1. The voltage signal passes through the shell of the pressure tank and is electrically connected to the DC power integrated control box 8; the positive bus 10 and the negative bus 19 are located on both sides of the battery pack 1, which are used to charge and discharge the battery pack 1, and pass through the shell of the pressure tank. The body is electrically connected to the DC power integrated control box 8; the DC power integrated control box 8 controls the voltage of the parallel capacity units of the battery pack 1 through the voltage collection harness 9, and the DC power integrated control box 8 controls the battery pack through the positive bus 10 and the negative bus 19. 1 for the input voltage and current.

The DC power integrated control box 8 is respectively connected with the pressurizer 3, the valve of the air inlet and outlet 4, the liquid level sensor 6, the valve of the heating medium inlet and outlet pipe 12, the valve of the electrolyte inlet and outlet 13, the temperature sensor 14, the refrigerant inlet and outlet. The valve of the tube 15, the gas pressure sensor 18, the voltage collection harness 9 of the battery pack 1, the positive bus 10 of the battery pack 1 and the negative bus 19 of the battery pack 1 are connected to collect the liquid level signal of the electrolyte in the pressure tank, The ambient temperature signal and ambient air pressure signal in the pressure tank, as well as the pressure value of the pressurizer 3, the amount of electrolyte in and out, the amount of heat medium in and out, the amount of refrigerant in and out, the amount of protective gas in and out, the magnitude of voltage and current, etc.

The DC power integrated control box 8 is integrated with an automatically adjustable constant-current constant-voltage DC power supply (preferably a high-voltage equalized constant-current constant-voltage DC power supply).

The lithium-ion pole piece battery pack 1 to be activated by liquid injection is obtained by cutting and stacking the pole pieces to obtain the pole piece capacity unit 101, and then welding the pole piece capacity unit 101. The specific preparation process is: After the sheet, several negative electrode sheets and several separators are cut, a separator is adhered between the positive electrode sheet and the negative electrode sheet, and a stacking unit is obtained by stacking in this way; several stacking units are connected in parallel to form a pole piece capacity unit 101 Obtain several pole piece capacity units 101 according to this method; The pole piece positive ear lugs of all stacking units of each pole piece capacity unit 101 are connected into a capacity unit positive pole ear 103 by ultrasonic welding process, and each pole piece capacity unit 101 All the pole piece negative lugs are connected to a capacity unit negative lug 102 by ultrasonic welding process; the capacity unit negative lug 102 of one pole piece capacity unit 101 is connected to the capacity unit positive electrode of the previous or next pole piece capacity unit 101 by ultrasonic welding process ear 103, and then all the pole piece capacity units 101 are connected end to end one by one to form a positive and negative series structure to improve the output voltage level of the battery pack; the capacity unit positive lug 103 of the first pole piece capacity unit 101 leads out the battery The total positive terminal 105 of the package; the negative tab 102 of the capacity unit of the last pole piece capacity unit 101 leads to the total negative terminal 106 of the battery pack; the positive tab 103 of the capacity unit or the negative electrode of the capacity unit between two adjacent pole piece capacity units 101 The ear 102 is connected to a voltage collection harness 9 by an ultrasonic welding process; the capacity unit positive ear 103 of the first pole piece capacity unit 101 is connected to a voltage collection harness 9 by an ultrasonic welding process, and the capacity unit negative electrode of the last pole piece capacity unit 101 The ears 102 are connected to a voltage collection harness 9 through an ultrasonic welding process; an insulating and impermeable membrane 104 is arranged between two adjacent pole piece capacity units 101, and then each pole piece capacity unit 101 is separated separately to form an independent unit, Ensure that the electrolyte of each pole piece capacity unit 101 does not communicate with each other, and obtain the lithium ion pole piece battery pack 1 to be activated by liquid injection;

The total positive terminal 105 of the battery pack is connected to the positive bus 10 by a welding fixture, and the total negative terminal 106 of the battery pack is connected to the negative bus 19 by a welding fixture.

The working principle and workflow of the present invention are:

Step 1. Drying: Put the lithium-ion pole piece battery pack 1 to be activated by liquid injection into the pressure mold 1 2 and the pressure die 2 17, and apply pressure through the pressurizer 3 to hold the position of the battery pack 1. Fix; then lead the voltage collection harness 9 of the battery pack 1, the external terminals of the positive bus 10 and the negative bus 19 out of the pressure tank; Combined into a closed pressure tank; after the heat medium is introduced through the heat medium inlet and outlet pipe 12, the ambient temperature in the pressure tank is raised to the temperature required for drying to dry the battery pack 1; Vacuum and introduce protective gas such as nitrogen to purify the environment in the tank, discharge water vapor, make the environment in the pressure tank pure, ensure that water, oxygen, etc. do not contact the lithium ion electrolyte to be injected, and do not pollute the electrolyte; preferably, The protective gas is introduced through the air inlet and outlet 4 and the air pressure signal is collected by the gas pressure sensor 18 to reach the ambient air pressure required for drying the battery pack 1;

Step 2. Liquid injection: After the drying is completed, adjust the ambient temperature in the pressure tank to the temperature required for the battery pack 1 to infiltrate the electrolyte through the cooperation of the heating medium inlet and outlet pipes 12, the refrigerant inlet and outlet pipes 15 and the temperature sensor 14 to speed up The flow speed of the electrolyte; inject the electrolyte through the electrolyte inlet 13 and measure the liquid level position of the electrolyte through the liquid level sensor 6, stop injecting the electrolyte after the electrolyte is completely immersed in the battery pack 1; control the external device through the air inlet and outlet 4 The air volume and protective gas intake volume are evacuated and the air pressure signal is collected by the gas pressure sensor 18 to reach the ambient air pressure required for the battery pack 1 to infiltrate the electrolyte (maintain positive pressure), and the air pressure assists the electrolyte to infiltrate the inside of the pole piece; battery pack 1 Soak in the electrolyte and let it stand, fully infiltrate and absorb enough liquid; after the infiltration is completed, empty the excess electrolyte through the electrolyte inlet and outlet 13;

Preferably, the liquid level difference of the electrolyte in the pressure tank can be detected by the liquid level sensor 6 to obtain the infiltration amount of the electrolyte entering the inside of the pole piece of the battery pack 1, and whether the liquid injection is completed is judged by the infiltration amount or the infiltration time;

Step 3. Opening activation: After the excess electrolyte is emptied, adjust the ambient temperature in the pressure tank to the temperature required for activation of the battery pack 1 opening through the cooperation of the heating medium inlet and outlet pipes 12, the refrigerant inlet and outlet pipes 15 and the temperature sensor 14 ( 30 to 65°C, preferably 45°C to 60°C); control the vacuuming air volume and the protective gas air intake through the external equipment of the air inlet and outlet 4, and collect the air pressure signal through the gas pressure sensor 18, and activate the required ambient air pressure until the opening of the battery pack 1 (150kpa～250kpa); apply pressure through the pressurizer 3 to achieve the clamping force required for the activation of the opening of the battery pack 1, so as to realize the clamping of the battery pack 1; The wire harness 9 is connected to the automatically adjustable constant current and constant voltage DC power supply of the DC power integrated control box 8 to activate the battery pack 1 by high-voltage constant current and constant voltage subsection charging and discharging; the activation DC voltage is 5V～1000V (preferably 5V～750V);

Preferably, after the opening is activated, the battery pack is completely filled and sealed, and the positive bus 10 , the negative bus 19 and the voltage collection harness 9 of the battery pack 1 are positioned through the filled sealed package and are pre-positioned on the outside of the filled sealed package. Leave the external terminal, and then connect the electrical appliance and the battery management system to make a charge and discharge energy storage power supply.

What is not described in the present invention applies to the prior art.

Claims (8)

1. a lithium ion pole piece battery pack liquid injection and opening activation device, it is characterized in that the device comprises a pressurizing die 1, a pressurizer, an air inlet and outlet, a pressure tank shell 1, a liquid level sensor, a sealing clamp, DC power integrated control box, pressure tank shell 2, heating medium inlet and outlet pipes, electrolyte inlet and outlet, temperature sensor, refrigerant inlet and outlet pipes, pressure mold 2 and gas pressure sensor; The pressure tank shell 1 and the pressure tank shell 2 are connected by a sealing clamp to form a detachable pressure tank; the pressure mold 1 and the pressure mold 2 are placed inside the pressure tank; the pressurizer is set On the outer wall of the pressure tank, its output end extends into the inside of the pressure tank and is in contact with one of the pressure mold 1 and the pressure mold 2 for applying pressure; the other of the pressure mold 1 and the pressure mold 2 is set On the inner wall of the pressure tank, the inner wall is located on the opposite side of the pressurizer; the lithium-ion pole piece battery pack to be activated by injection is placed between the pressurizing die 1 and the pressurizing die 2, and the pressure is realized by the pressurization of the pressurizer. Clamping or clamping the battery pack between the first die and the second pressurizing die; the liquid level sensor is arranged on the inner wall of the pressure tank, above the battery pack, and is used to measure the liquid level of the electrolyte in the pressure tank; The top is provided with a transparent air inlet and outlet, which is located above the liquid level sensor, which is used to realize the vacuuming of the pressure tank and the introduction of protective gas to form a specific air pressure; the bottom of the pressure tank is provided with a transparent electrolyte inlet and outlet. It is used for the introduction and discharge of electrolyte; the gas pressure sensor is arranged on the inner wall of the pressure tank, above the liquid level sensor, to measure the ambient vacuum and the ambient air pressure after the protective gas is introduced; The heating medium inlet and outlet pipes and the refrigerant inlet and outlet pipes are used to provide a hot and cold environment for the battery pack; the temperature sensor is arranged inside the pressure tank to measure the ambient temperature of the battery pack in the pressure tank and the temperature of the battery pack itself. 2. The lithium ion pole piece battery pack liquid injection and opening activation device according to claim 1, characterized in that the heating medium inlet and outlet pipes and the refrigerant inlet and outlet pipes pass through the casing of the pressure tank, and the ends are located at the pressure mold one and the other. Pressurize one or both of the two molds. 3. The lithium-ion pole piece battery pack liquid injection and opening activation device according to claim 1, characterized in that the ends of the heating medium inlet and outlet pipes and the refrigerant inlet and outlet pipes are located between the first pressure tank shell and the second pressure tank shell. one or both. 4. The lithium ion pole piece battery pack liquid injection and opening activation device according to claim 1, characterized in that in the temperature regulation pipeline inside the end pressure tank of the heating medium inlet and outlet pipes and the refrigerant inlet and outlet pipes, the temperature regulation pipe The road is set outside the battery pack. 5. The lithium-ion pole piece battery pack liquid injection and opening activation device according to claim 1, characterized in that the device further comprises a pressure tank base; the pressure tank base is arranged at the bottom of the pressure tank for adjusting the levelness and stability Support the pressure tank. 6. The lithium ion pole piece battery pack liquid injection and opening activation device according to claim 1, characterized in that the DC power integrated control box is respectively connected with a pressurizer, a valve of an air inlet and outlet, a liquid level sensor, and a heat medium inlet and outlet. The valve of the outlet pipe, the valve of the electrolyte inlet and outlet, the temperature sensor, the valve of the refrigerant inlet and outlet pipe, the gas pressure sensor, the voltage collection wiring harness of the battery pack, the positive bus of the battery pack and the negative bus of the battery pack are connected. 7. The lithium ion pole piece battery pack liquid injection and opening activation device according to claim 1 or 6, characterized in that the DC power supply integrated control box is integrated with an automatically adjustable constant current and constant voltage DC power supply. 8. The lithium-ion pole piece battery pack liquid injection and opening activation device according to claim 7, characterized in that the DC power supply integrated control box is integrated with a high-voltage equalized constant-current constant-voltage DC power supply.

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