Formation method of semi-solid soft package lithium battery

Abstract

The invention relates to the technical field of lithium battery manufacturing, in particular to a formation method of a semi-solid soft package lithium battery. A formation module is arranged in the upper cavity of the cabinet body, the formation module comprises a plurality of heating plates which are arranged at intervals, and a liquid channel is arranged in each heating plate; a heating water tank and a cooling water tank are arranged in the lower cavity of the cabinet body; a first water pump in the heating water tank is connected with a hot water main inlet pipe; the hot water main inlet pipe is connected to a water inlet of the liquid channel through a hot water inlet branch pipe; a water outlet of the liquid channel is connected to a hot water main return pipe through a hot water return branch pipe; a water outlet end of the hot water main return pipe is connected to the heating water tank; a second water pump in the cooling water tank is connected with a cold water main inlet pipe; the cold water main inlet pipe is connected to a water inlet of the liquid channel through a cold water inlet branch pipe; a water outlet of the liquid channel is connected to a cold water main return pipe through a cold water return branch pipe, and the water outlet end of the cold water main return pipe is connected to the cooling water tank.

Description

Technical Field

[0001] The invention relates to the technical field of lithium battery manufacturing, and in particular to a formation method of a semi-solid soft-pack lithium battery. Background Art

[0002] The formation process is one of the most critical processes in the production of semi-solid soft-pack lithium batteries. The formation is often carried out at 30 to 60 degrees Celsius to improve the battery's cycle performance and storage performance. The main functions of the formation include: ① Activating the active substances in the battery. Through the first charge, the active substances in the battery are activated to activate the lithium battery. ② Forming the SEI film. During the formation process, the lithium salt reacts with the electrolyte to form a solid electrolyte interface film on the negative electrode side of the lithium battery. This film can prevent further side reactions and reduce the loss of active lithium, while increasing the safety and stability of the battery. ③ Improving battery performance. Through the formation process, the electrochemical performance of the battery can be optimized to ensure that the battery exhibits better performance and longer life during use.

[0003] The equipment used for the formation is a formation cabinet, which has a formation module, and has multiple overlapping heating plates in the formation mode. When the semi-solid soft-pack lithium battery is formed, the semi-solid soft-pack lithium battery is placed between two adjacent heating plates, and the heating plates are compressed by the cylinder on the formation module, and then the hot pressing formation operation is performed. In the prior art, a patent with a publication number of CN206098585U discloses a fully automatic high-temperature pressurized formation machine for polymer lithium batteries. Another example is a patent with a publication number of CN206098584U discloses a horizontal high-temperature pressurized formation machine for polymer lithium batteries.

[0004] However, the above prior art forming machine has the following problems: after the formation is completed, the semi-solid soft-pack lithium battery is still sandwiched between two heating plates, so it is impossible to achieve rapid cooling. In addition, the heating plates in the traditional forming machine are electrically heated, resulting in high power consumption. Summary of the invention

[0005] The main purpose of the present invention is to provide a formation method for a semi-solid soft-pack lithium battery, aiming to solve the above technical problems.

[0006] To achieve the above object, the present invention provides a formation method for a semi-solid soft-pack lithium battery, which uses a formation cabinet to form a semi-solid soft-pack lithium battery, comprising the following steps:

[0007] S1, preparing a heating plate, wherein a liquid channel is provided inside the heating plate;

[0008] S2, assembling a plurality of heating plates into a formation module of a formation cabinet, wherein the plurality of heating plates are arranged at intervals from each other;

[0009] S3, placing the semi-solid soft-pack lithium battery to be formed in the gap between two adjacent heating plates, and pressing the heating plates tightly;

[0010] S4, introducing circulating hot water into the liquid channel to heat the heating plate;

[0011] S5. Introduce circulating cold water into the liquid channel to cool the heating plate.

[0012] S6. After the formation is completed, release the heating plate and take out the semi-solid soft-pack lithium battery.

[0013] Preferably, the formation cabinet comprises a cabinet body, the cabinet body has an upper cavity and a lower cavity, a formation module is arranged in the upper cavity of the cabinet body, and the heating plate is installed in the formation module; a heating water tank and a cooling water tank are arranged in the lower cavity of the cabinet body; the liquid channel is distributed inside the heating plate in a circuitous manner up and down; a first water pump is arranged in the heating water tank, and the first water pump is connected to a hot water main inlet pipe; a hot water inlet branch pipe is connected to the hot water main inlet pipe, and the hot water inlet branch pipe is connected to the water inlet of the liquid channel; the water outlet of the liquid channel is connected to the hot water return pipe through the hot water return pipe. The water branch pipe is connected to the hot water main return pipe, and the water outlet end of the hot water main return pipe is connected to the heating water tank; a second water pump is arranged in the cooling water tank, and the second water pump is connected to the cold water main inlet pipe; a cold water inlet branch pipe is connected to the cold water main inlet pipe, and the cold water inlet branch pipe is connected to the water inlet of the liquid channel; the water outlet of the liquid channel is connected to the cold water main return pipe through the cold water return branch pipe, and the water outlet end of the cold water main return pipe is connected to the cooling water tank; solenoid valves are arranged on the hot water inlet branch pipe, the hot water return branch pipe, the cold water inlet branch pipe, and the cold water return branch pipe.

[0014] Preferably, in step S4, when the heating plate is heated, the solenoid valves on the cold water inlet branch and the cold water return branch are closed, the solenoid valves on the hot water inlet branch and the hot water return branch are opened, the first water pump is started, and the hot water in the heating water tank flows into the liquid channel of the heating plate through the hot water main inlet pipe and the hot water inlet branch to heat the heating plate, and then the hot water flows back to the heating water tank from the hot water return branch and the hot water main return pipe.

[0015] Preferably, in step S5, when cooling the heating plate, the solenoid valves on the hot water inlet branch and the hot water return branch are closed, the solenoid valves on the cold water inlet branch and the cold water return branch are opened, the second water pump is started, and the cold water in the cooling water tank flows into the liquid channel of the heating plate through the cold water main inlet pipe and the cold water inlet branch to cool the heating plate, and then the cold water flows back to the cooling water tank from the cold water return branch and the cold water main return pipe.

[0016] Preferably, a three-way pipe joint is provided at the water inlet and the water outlet of the liquid channel respectively.

[0017] Preferably, the formation cabinet further comprises a controller, which is controllably connected to the solenoid valve, the first water pump and the second water pump, and is used to control the opening and closing of the solenoid valve, and the starting and stopping of the first water pump and the second water pump.

[0018] Preferably, a first temperature sensor is provided on the heating plate and a heating tube is provided in the heating water tank; the first temperature sensor is connected to the controller; the controller is control-connected to the heating tube for controlling turning the heating tube on or off according to the temperature signal of the first temperature sensor.

[0019] Preferably, a temperature display device is provided on the cabinet; the first temperature sensor is connected to the temperature display device; a second temperature sensor is provided in the heating water tank, and the second temperature sensor is connected to the temperature display device; a third temperature sensor is provided in the cooling water tank, and the third temperature sensor is connected to the temperature display device.

[0020] Preferably, water supply connection ports are respectively provided at the upper parts of the heating water tank and the cooling water tank; and drainage ports are provided at the bottoms of the heating water tank and the cooling water tank.

[0021] Preferably, the outer peripheral surface of the heating water tank is wrapped with thermal insulation cotton; and filter nets are respectively provided at the water inlets of the first water pump and the second water pump.

[0022] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0023] (1) In the present invention, the heating plate can be continuously cooled by circulating cold water, which is conducive to achieving rapid cooling.

[0024] (2) In the present invention, the heating plate is heated by hot water circulation, which overcomes the problem of high power consumption caused by electric heating of the heating plate in the traditional chemical forming machine.

[0025] (3) The formation cabinet provided by the present invention can achieve rapid heating and cooling of the heating plate, thereby meeting the needs of semi-solid soft-pack lithium battery formation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0027] Figure 1 This is the overall structural diagram of the formation cabinet provided by the present invention;

[0028] Figure 2 It is a front view of the heating plate in the present invention;

[0029] Figure 3 for Figure 2 Middle AA section view;

[0030] Figure 4 This is a schematic diagram of the connecting pipes of the heating water tank, the cooling water tank and the heating plate in the present invention, and the arrows in the figure indicate the direction of water flow.

[0031] Explanation of the accompanying drawings: 1. Cabinet; 2. Heating plate; 2a. Liquid channel; 3. Heating water tank; 4. Cooling water tank; 5. First water pump; 6. Hot water main inlet pipe; 7. Hot water inlet branch pipe; 8. Hot water return branch pipe; 9. Hot water main return pipe; 10. Second water pump; 11. Cold water main inlet pipe; 12. Cold water inlet branch pipe; 13. Cold water return branch pipe; 14. Cold water main return pipe; 15. Three-way pipe joint; 16. Heating pipe; 17. Insulation cotton; 18. Filter; 19. First temperature sensor; 20. Temperature display device; 21. Second temperature sensor; 22. Third temperature sensor; 23. Water supply pipe port; 24. Drain port. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] As shown in the accompanying drawings, the present invention provides a formation method for a semi-solid soft-pack lithium battery, which uses a formation cabinet to form a semi-solid soft-pack lithium battery, comprising the following steps:

[0036] S1. Prepare a heating plate 2, wherein a liquid channel 2a is provided inside the heating plate 2; the liquid channel 2a is distributed inside the heating plate 2 in an up-and-down circuitous manner.

[0037] S2, assembling a plurality of heating plates 2 into a formation module of a formation cabinet, wherein the plurality of heating plates 2 are arranged at intervals from each other;

[0038] S3, placing the semi-solid soft-pack lithium battery to be formed in the interval between two adjacent heating plates 2, and pressing the heating plates 2;

[0039] S4, circulating hot water is introduced into the liquid channel 2a to heat the heating plate 2;

[0040] S5. Introduce circulating cold water into the liquid channel 2a to cool the heating plate 2.

[0041] S6. After the formation is completed, release the heating plate 2 and take out the semi-solid soft-pack lithium battery.

[0042] Combination Figure 1 As shown, the formation cabinet comprises a cabinet 1, the cabinet 1 has an upper cavity and a lower cavity, a formation module is arranged in the upper cavity of the cabinet 1, and the formation module comprises a plurality of heating plates 2 arranged at intervals from each other. The structure of the formation module is conventional prior art, which has been disclosed in patents CN206098585U and CN206098584U, and will not be repeated here.

[0043] Combination Figures 2 to 4As shown, in this embodiment, a liquid channel 2a is provided inside each of the heating plates 2; a heating water tank 3 and a cooling water tank 4 are provided in the lower cavity of the cabinet 1; a first water pump 5 is provided in the heating water tank 3, and the first water pump 5 is connected to a hot water main water inlet pipe 6; a hot water inlet branch pipe 7 is connected to the hot water main water inlet pipe 6, and the hot water inlet branch pipe 7 is connected to the water inlet of the liquid channel 2a; the water outlet of the liquid channel 2a is connected to the hot water main return pipe 9 through a hot water return branch pipe 8, and the water outlet end of the hot water main return pipe 9 is connected to the heating water tank 3; a second water pump 10 is arranged in the cooling water tank 4, and the second water pump 10 is connected to a cold water main inlet pipe 11; a cold water inlet branch pipe 12 is connected to the cold water main inlet pipe 11, and the cold water inlet branch pipe 12 is connected to the water inlet of the liquid channel 2a; the water outlet of the liquid channel 2a is connected to the cold water main return pipe 14 through the cold water return branch pipe 13, and the water outlet end of the cold water main return pipe 14 is connected to the cooling water tank 4; solenoid valves are arranged on the hot water inlet branch pipe 7, the hot water return branch pipe 8, the cold water inlet branch pipe 12, and the cold water return branch pipe 13.

[0044] By adopting the above structure, combined with Figure 4 The specific usage principle is as follows:

[0045] In step S4, when heating the heating plate 2, the solenoid valves on the cold water inlet branch 12 and the cold water return branch 13 are closed, the solenoid valves on the hot water inlet branch 7 and the hot water return branch 8 are opened, the first water pump 5 is started, and the hot water in the heating water tank 3 flows into the liquid channel 2a of the heating plate 2 through the hot water main inlet pipe 6 and the hot water inlet branch 7 to heat the heating plate 2. After that, the hot water flows back to the heating water tank 3 from the hot water return branch 8 and the hot water main return pipe 9. This cycle can continuously heat the heating plate 2.

[0046] In step S5, when cooling the heating plate 2, the solenoid valves on the hot water inlet branch 7 and the hot water return branch 8 are closed, the solenoid valves on the cold water inlet branch 12 and the cold water return branch 13 are opened, and the second water pump 10 is started. The cold water in the cooling water tank 4 flows into the liquid channel 2a of the heating plate 2 through the cold water main inlet pipe 11 and the cold water inlet branch 12 to cool the heating plate 2. After that, the cold water flows back to the cooling water tank 4 from the cold water return branch 13 and the cold water main return pipe 14. This cycle can continuously cool the heating plate 2.

[0047] Combination Figure 4As shown, in order to facilitate the connection of pipelines, three-way pipe joints 15 are respectively provided at the water inlet and the water outlet of the liquid channel 2a. Specifically, the outlet ends of the hot water inlet branch pipe 7 and the cold water inlet branch pipe 12 are respectively connected to the two inlets of the three-way pipe joint 15 at the water inlet of the liquid channel 2a; the water inlet ends of the hot water return branch pipe 8 and the cold water return branch pipe 13 are respectively connected to the two outlets of the three-way pipe joint 15 at the water outlet of the liquid channel 2a.

[0048] In this embodiment, the formation cabinet further includes a controller, which is connected to the solenoid valve, the first water pump 5 and the second water pump 10 for controlling the opening and closing of the solenoid valve and the starting and stopping of the first water pump 5 and the second water pump 10.

[0049] A first temperature sensor 19 is provided on the heating plate 2, and a heating tube 16 is provided in the heating water tank 3; the purpose of providing the heating tube 16 is to heat the water in the heating water tank 3. The first temperature sensor 19 is connected to the controller; the controller is connected to the heating tube 16 for controlling the opening or closing of the heating tube 16 according to the temperature signal of the first temperature sensor 19. When the temperature detected by the first temperature sensor 19 is higher than the set value, the controller turns off the heating tube 16, and conversely, when the temperature detected by the first temperature sensor 19 is lower than the set value, the controller turns on the heating tube 16. In this embodiment, the temperature setting value is 55 degrees Celsius.

[0050] In this embodiment, in order to improve the heat preservation effect of the heating water tank 3, a heat preservation cotton 17 is wrapped on the outer peripheral surface of the heating water tank 3. In order to prevent impurities in the heating water tank 3 and the cooling water tank 4 from entering the liquid channel 2a of the heating plate 2 and causing blockage, a filter screen 18 is provided at the water inlet of the first water pump 5 and the second water pump 10 respectively.

[0051] Combination Figure 1 and Figure 4As shown, a temperature display device 20 is provided on the cabinet 1, and a first temperature sensor 19 is provided on the heating plate 2; the first temperature sensor 19 is connected to the temperature display device 20. The first temperature sensor 19 is used to sense the temperature on the heating plate 2 and convert it into a usable output signal, which is transmitted to the temperature display device 20, thereby realizing real-time display of the temperature. Further, a second temperature sensor 21 is provided in the heating water tank 3, and the second temperature sensor 21 is connected to the temperature display device 20. The second temperature sensor 21 is used to sense the water temperature in the heating water tank 3 and convert it into a usable output signal, which is transmitted to the temperature display device 20, thereby realizing real-time display of the temperature of the heating water tank 3. Similarly, a third temperature sensor 22 is provided in the cooling water tank 4, and the third temperature sensor 22 is connected to the temperature display device 20. The third temperature sensor 22 is used to sense the water temperature in the cooling water tank 4 and convert it into a usable output signal, which is transmitted to the temperature display device 20, thereby realizing real-time display of the temperature of the cooling water tank 4.

[0052] Combination Figure 4 As shown, water supply pipe ports 23 are respectively provided on the upper parts of the heating water tank 3 and the cooling water tank 4. The water supply pipe ports 23 are used to connect to a water source. In this embodiment, the water source is a tap water pipe.

[0053] After the heating water tank 3 is used for a long time, the water evaporates and causes the water level to drop. Water is replenished by connecting the water replenishment connection port 23 to the tap water pipe.

[0054] A drain port 24 is provided at the bottom of the heating water tank 3 and the cooling water tank 4. After long-term use, impurities will accumulate in the water inside the heating water tank 3 and the cooling water tank 4, so water can be drained through the drain port 24, and the two water tanks can be cleaned and then replenished with water.

[0055] In addition, when cold water is used for circulating cooling, some hot water produced in the liquid channel 2a will enter the cooling water tank 4. At the same time, the water temperature in the cooling water tank 4 will rise during the cooling process. Therefore, some water can be discharged through the drain port 24, and water can be replenished using the water replenishment pipe port 23 to maintain the water temperature in the cooling water tank 4 and ensure the cooling effect.

[0056] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A formation method for a semi-solid soft-pack lithium battery, using a formation cabinet to form a semi-solid soft-pack lithium battery, characterized in that: The following steps are involved: S1, preparing a heating plate (2), wherein a liquid channel (2a) is provided inside the heating plate (2); S2, assembling a plurality of heating plates (2) into a formation module of a formation cabinet, wherein the plurality of heating plates (2) are arranged in a spaced relationship from each other; S3, placing the semi-solid soft-pack lithium battery to be formed in the gap between two adjacent heating plates (2), and pressing the heating plates (2); S4, introducing circulating hot water into the liquid channel (2a) to heat the heating plate (2); S5. Circulating cold water is introduced into the liquid channel (2a) to cool the heating plate (2). S6. After the formation is completed, release the heating plate (2) and take out the semi-solid soft-pack lithium battery.

2. A formation method for a semi-solid soft-pack lithium battery as claimed in claim 1, characterized in that: The formation cabinet comprises a cabinet (1), the cabinet (1) having an upper cavity and a lower cavity, a formation module being arranged in the upper cavity of the cabinet (1), and the heating plate (2) being installed in the formation module; a heating water tank (3) and a cooling water tank (4) being arranged in the lower cavity of the cabinet (1); the liquid channel (2a) being distributed in an up-and-down circuitous manner inside the heating plate (2); A first water pump (5) is arranged in the heating water tank (3), and the first water pump (5) is connected to a hot water main inlet pipe (6); a hot water inlet branch pipe (7) is connected to the hot water main inlet pipe (6), and the hot water inlet branch pipe (7) is connected to the water inlet of the liquid channel (2a); the water outlet of the liquid channel (2a) is connected to the hot water main return pipe (9) through a hot water return branch pipe (8), and the water outlet end of the hot water main return pipe (9) is connected to the heating water tank (3); A second water pump (10) is arranged in the cooling water tank (4), and the second water pump (10) is connected to a cold water main inlet pipe (11); a cold water inlet branch pipe (12) is connected to the cold water main inlet pipe (11), and the cold water inlet branch pipe (12) is connected to the water inlet of the liquid channel (2a); the water outlet of the liquid channel (2a) is connected to the cold water main return pipe (14) through a cold water return branch pipe (13), and the water outlet end of the cold water main return pipe (14) is connected to the cooling water tank (4); Solenoid valves are provided on the hot water inlet branch pipe (7), the hot water return branch pipe (8), the cold water inlet branch pipe (12), and the cold water return branch pipe (13).

3. A formation method for a semi-solid soft-pack lithium battery as claimed in claim 2, characterized in that: In step S4, when the heating plate (2) is heated, the solenoid valves on the cold water inlet branch pipe (12) and the cold water return branch pipe (13) are closed, the solenoid valves on the hot water inlet branch pipe (7) and the hot water return branch pipe (8) are opened, the first water pump (5) is started, and the hot water in the heating water tank (3) flows into the liquid channel (2a) of the heating plate (2) through the hot water main inlet pipe (6) and the hot water inlet branch pipe (7), heating the heating plate (2), and then the hot water flows back to the heating water tank (3) from the hot water return branch pipe (8) and the hot water main return pipe (9).

4. A formation method for a semi-solid soft-pack lithium battery as claimed in claim 2, characterized in that: In step S5, when cooling the heating plate (2), the solenoid valves on the hot water inlet branch pipe (7) and the hot water return branch pipe (8) are closed, the solenoid valves on the cold water inlet branch pipe (12) and the cold water return branch pipe (13) are opened, the second water pump (10) is started, and the cold water in the cooling water tank (4) flows into the liquid channel (2a) of the heating plate (2) through the cold water main inlet pipe (11) and the cold water inlet branch pipe (12) to cool the heating plate (2), and then the cold water flows back to the cooling water tank (4) from the cold water return branch pipe (13) and the cold water main return pipe (14).

5. A formation method for a semi-solid soft-pack lithium battery as claimed in claim 2, characterized in that: A three-way pipe joint (15) is respectively provided at the water inlet and the water outlet of the liquid channel (2a).

6. A formation method for a semi-solid soft-pack lithium battery as claimed in claim 2, characterized in that: The formation cabinet further comprises a controller, which is connected to the solenoid valve, the first water pump (5) and the second water pump (10) for controlling the opening and closing of the solenoid valve and the starting and stopping of the first water pump (5) and the second water pump (10).

7. A formation method for a semi-solid soft-pack lithium battery as claimed in claim 6, characterized in that: A first temperature sensor (19) is arranged on the heating plate (2), and a heating tube (16) is arranged in the heating water tank (3); the first temperature sensor (19) is connected to the controller; the controller is control-connected to the heating tube (16) and is used to control the heating tube (16) to be turned on or off according to a temperature signal of the first temperature sensor (19).

8. A formation method for a semi-solid soft-pack lithium battery as claimed in claim 7, characterized in that: A temperature display device (20) is arranged on the cabinet (1); the first temperature sensor (19) is connected to the temperature display device (20); a second temperature sensor (21) is arranged in the heating water tank (3), and the second temperature sensor (21) is connected to the temperature display device (20); a third temperature sensor (22) is arranged in the cooling water tank (4), and the third temperature sensor (22) is connected to the temperature display device (20).

9. A formation method for a semi-solid soft-pack lithium battery as claimed in claim 2, characterized in that: Water supply pipe openings (23) are respectively arranged at the upper parts of the heating water tank (3) and the cooling water tank (4); and drainage openings (24) are arranged at the bottom parts of the heating water tank (3) and the cooling water tank (4). The formation method of a semi-solid soft-pack lithium battery as claimed in claim 2, characterized in that: The outer peripheral surface of the heating water tank (3) is wrapped with heat-insulating cotton (17); and filter screens (18) are respectively provided at the water inlets of the first water pump (5) and the second water pump (10).

Images