Secondary battery formation equipment and secondary battery production process

Abstract

The present invention provides a secondary battery formation device and a secondary battery production process, the formation device includes a cabinet, the cabinet stores a formation component, the formation device also includes: a liquid cooling component, which is arranged on the cabinet, the liquid cooling component includes a circulation pipe, the circulation pipe is used to circulate a heat exchange medium, at least part of the circulation pipe is in contact with the formation component; wherein the formation component includes a formation component, the circulation pipe is in contact with the formation component, a sealing component is arranged on the formation component, the sealing component has an avoidance position and a blocking position, and the sealing component is movably arranged between the avoidance position and the blocking position. The present application solves the problem that the battery cell formation formation device in the prior art uses liquid cooling to control the temperature, and water vapor easily enters the battery cell and affects the quality of the battery cell.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage battery production, and in particular, to a formation device for secondary batteries and a production process for secondary batteries. Background Art

[0002] During the battery production process, after the battery cells are assembled, a series of operations such as liquid injection, sealing and formation are required, and finally the qualified batteries are packaged.

[0003] Currently, after the battery cells are filled with liquid and left to soak, they need to be sent to a formation cabinet for formation. In order to ensure the quality of the solid electrolyte interface film during the formation of the battery cells, there are high requirements for the ambient temperature of the battery cells during formation. The formation temperature affects the viscosity and conductivity of the electrolyte, as well as the diffusion rate of ions in the electrode material. Therefore, when the battery cells are stored on the storage cabinet, it is necessary to adjust the ambient temperature of the battery cells.

[0004] In the prior art, in order to improve the control accuracy of the ambient temperature of the battery cells and avoid interfering with the temperature of the storage location where the formation cabinet is located, a liquid cooling temperature control device is provided on the formation cabinet to control the ambient temperature of the battery cells. However, since the electrolyte is sensitive to moisture, water vapor may penetrate into the battery cells during the liquid cooling temperature control process, thereby affecting the battery quality. Summary of the Invention

[0005] The main object of the present invention is to provide a formation device for secondary batteries and a production process for secondary batteries to solve the problem that in the prior art, the formation device for battery cells uses liquid cooling to control the temperature, and water vapor easily enters the battery cells and affects the quality of the battery cells.

[0006] To achieve the above object, according to one aspect of the present invention, there is provided a formation device for secondary batteries, including a cabinet body on which a formation component is stored. The formation device further includes: a liquid cooling component provided on the cabinet body, the liquid cooling component including a circulation pipeline for circulating a heat exchange medium, at least a part of the circulation pipeline being in contact with the formation component to adjust the temperature of the formation component; wherein, the formation component includes a formation part, the circulation pipeline is in contact with the formation part, and a sealing component is provided on the formation part. The sealing component has an avoidance position and a blocking position, and the sealing component is movably provided between the avoidance position and the blocking position so that the formation part is in an open state or a sealed state.

[0007] Further, the formation component further includes: a tray provided with a plurality of placement stations, each placement station being used for placing the formation component, the tray being provided on the cabinet body, and the circulation pipeline being in contact with the tray.

[0008] Further, the formation device further includes: a fan assembly disposed within the cabinet, the fan assembly including an air outlet passage for blowing air into the cabinet; wherein, the fan assembly is disposed at the top of the cabinet, and the air outlet of the air outlet passage faces the bottom surface of the cabinet.

[0009] Further, the formation component includes: a liquid storage cup for storing electrolyte, a communication passage is provided on the liquid storage cup, at least a part of the sealing component is disposed within the communication passage, and the position of the sealing component is movably arranged to avoid or block the communication passage.

[0010] Further, the sealing component includes: a sealing plug, at least a part of the sealing plug is disposed within the communication passage; a support frame disposed within the liquid storage cup; an elastic component disposed on the support frame, and two ends of the elastic component are respectively connected to the support frame and the sealing plug, and the sealing plug is pushed into the communication passage by the elastic force of the elastic component.

[0011] Further, in the direction from the inner side to the outer side of the liquid storage cup, the cross-sectional area of the flow cross-section of the communication passage gradually decreases, and at least a part of the surface of the sealing plug fits with the channel wall surface of the communication passage.

[0012] Further, the formation component further includes a formation cover covering the liquid storage cup, the formation cover is detachably connected to the liquid storage cup, and the formation device further includes: an ejecting component disposed within the formation cover, the ejecting component abuts against the sealing component and pushes the sealing component to a position avoiding the communication passage, so that the formation cover and the liquid storage cup are in a connected state.

[0013] Further, there are multiple communication passages, the multiple communication passages are spaced apart on the liquid storage cup, there are multiple sealing components, and the multiple sealing components are arranged in one-to-one correspondence with the multiple communication passages; there are multiple ejecting components, and the multiple ejecting components are arranged in one-to-one correspondence with the multiple sealing components.

[0014] According to another aspect of the present invention, there is provided a secondary battery production process applicable to the above-mentioned formation device of the secondary battery. The secondary battery production process includes: controlling the sealing component in the formation device to move to an avoidance position to inject electrolyte into the cell body through the formation component in the formation device; after the electrolyte injection is completed, controlling the sealing component to move to a blocking position to seal the formation component; performing charge and discharge on the cell body to form a solid electrolyte interface film; after the solid electrolyte interface film is formed, performing high-temperature aging on the cell body; then, sealing the electrolyte injection port on the cell body to obtain a battery; wherein, the environmental temperature where the cell body is located is controlled to be 45°C ± 5°C by the liquid cooling component in the formation device.

[0015] Further, after the electrolyte injection is completed, the battery cell body is subjected to high-temperature standing; during the process of injecting the electrolyte into the battery cell body and sealing the liquid injection port, the formation component is kept installed on the battery cell body, there is no need to seal the liquid injection port, and there is no need to perform secondary injection of the electrolyte into the battery cell body; wherein, the length of the formation component is L1, the width is W1, and the height is H1; the length of the battery cell body is L2, the width is W2, and the height is H2; L1 = (1~0.8)L2; W1 = (1~0.8)W2; H1 = (1~0.8)H2.

[0016] Applying the technical solution of the present invention, according to the formation equipment of the secondary battery provided by the present application, it includes a cabinet body, a formation component, a liquid cooling component and a sealing component. The formation component is stored on the cabinet body, the liquid cooling component is arranged on the cabinet body, the liquid cooling component includes a circulation pipeline, and the circulation pipeline is used for circulating a heat exchange medium. At least part of the circulation pipeline is attached to the formation component to adjust the temperature of the formation component; wherein, the formation component includes a formation part, the circulation pipeline is attached to the formation part, and a sealing component is arranged on the formation part. The sealing component has an avoidance position and a blocking position, and the sealing component is movably arranged between the avoidance position and the blocking position. Such a setting can control the temperature of the formation component through the liquid cooling component, that is, use the circulation pipeline to exchange heat with the formation component to adjust the temperature of the formation component. At the same time, in order to prevent the liquid medium from flowing into the formation component and then seeping into the battery cell body, affecting the battery performance, a sealing component is arranged on the formation part. The sealing component has an avoidance position and a blocking position. When injecting the electrolyte into the battery cell body, the sealing component moves to the avoidance position. After the injection is completed, the sealing component moves to the blocking position. By setting the sealing component, during the battery formation temperature control process, the sealing performance of the formation component is ensured, and thus the production quality of the battery is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The specification drawings forming a part of the present application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0018] Figure 1 The structural schematic diagram of the cabinet body in the formation equipment of the secondary battery according to the present invention is shown;

[0019] Figure 2 The structural schematic diagram of the circulation pipeline in the formation equipment of the secondary battery according to the present invention is shown;

[0020] Figure 3 The structural schematic diagram of the fan assembly in the formation equipment of the secondary battery according to the present invention is shown;

[0021] Figure 4Shows a schematic structural diagram of a first embodiment of a sealing component in a formation device of a secondary battery according to the present invention;

[0022] Figure 5 Shows a schematic structural diagram of a tray in a formation device of a secondary battery according to the present invention;

[0023] Figure 6 Shows a schematic structural diagram of a second embodiment of a sealing component in a formation device of a secondary battery according to the present invention;

[0024] Figure 7 Shows a schematic structural diagram of an embodiment of a liquid storage cup in a formation device of a secondary battery according to the present invention;

[0025] Figure 8 Shows a flowchart of a production process of a secondary battery according to the present invention;

[0026] Figure 9 Shows a flowchart of a production process of a secondary battery in the prior art.

[0027] Among them, the above-mentioned drawings include the following reference numerals:

[0028] 100, cabinet body; 200, formation assembly; 300, liquid cooling assembly; 310, circulation pipeline; 210, battery cell body; 220, formation component; 221, liquid storage cup; 222, formation cover; 2210, communication channel; 400, sealing component; 311, temperature adjustment branch; 230, tray; 231, placement station; 312, liquid inlet main pipe; 313, first liquid inlet branch pipe; 314, second liquid inlet branch pipe; 315, avoidance space; 500, fan assembly; 510, air outlet channel; 520, air guiding channel; 521, air guiding component; 530, heat exchange channel; 410, sealing plug; 420, support frame; 430, elastic component; 610, magnetic core; 620, electromagnetic component; 630, ejecting component. Detailed implementation manners

[0029] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0030] As mentioned in the background art, when forming a battery cell in the prior art, the battery cell is placed in a forming cabinet for processing. In order to conveniently control the ambient temperature of the battery cell, a liquid cooling device is provided on the forming cabinet to adjust the temperature of the battery cell body, thereby improving the forming effect. However, when using the liquid cooling device, water vapor is easily generated, and these water vapors are easily infiltrated into the battery cell body, affecting the quality of the battery. Therefore, in view of the above technical problems, the forming device for a secondary battery provided in this application adjusts the ambient temperature of the battery cell body through the liquid cooling assembly 300. Furthermore, a sealing member 400 is provided on the forming member 220. The sealing member 400 is provided with an avoidance position and a blocking position, and the sealing member 400 is movably provided between the avoidance position and the blocking position. When injecting electrolyte into the battery cell body, the sealing member 400 moves to the avoidance position. After the electrolyte injection is completed, the sealing member 400 moves to the blocking position. In this way, during the entire forming process, the sealing member 400 will not affect the electrolyte injection, and at the same time, the sealing member 400 can be used to maintain the seal of the forming member 220, preventing the water vapor generated by the heat exchange medium from entering the battery cell body through the forming member 220, thereby ensuring the sealing performance of the battery cell body during the entire forming step and ensuring the battery quality.

[0031] Please refer to Figures 1 to 7 , this application provides a forming device for a secondary battery, including a cabinet 100, on which a forming assembly 200 is stored. The forming device further includes: a liquid cooling assembly 300, provided on the cabinet 100. The liquid cooling assembly 300 includes a circulation pipeline 310 for circulating a heat exchange medium. At least a part of the circulation pipeline 310 is attached to the forming assembly 200 to adjust the temperature of the forming member 220. Among them, the forming assembly 200 includes a forming member 220, the circulation pipeline 310 is attached to the forming member 220, and a sealing member 400 is provided on the forming member 220. The sealing member 400 has an avoidance position and a blocking position, and the sealing member 400 is movably provided between the avoidance position and the blocking position to make the forming member 220 in an open state or a sealed state.

[0032] The formation device for a secondary battery provided by the present application includes a cabinet body 100, a formation assembly 200, a liquid cooling assembly 300, and a sealing member 400. The formation assembly 200 is stored on the cabinet body 100, and the liquid cooling assembly 300 is arranged on the cabinet body 100. The liquid cooling assembly 300 includes a circulation pipeline 310 for circulating a heat exchange medium, and at least a part of the circulation pipeline 310 is attached to the formation assembly 200. Among them, the formation assembly 200 includes a formation part 220, and the circulation pipeline 310 is attached to the formation part 220 to adjust the temperature of the formation part 220. A sealing member 400 is arranged on the formation part 220. The sealing member 400 has an avoidance position and a blocking position, and the sealing member 400 is movably arranged between the avoidance position and the blocking position to make the formation part 220 in an open state or a sealed state. Such a setting can control the temperature of the formation part 220 through the liquid cooling assembly 300, that is, use the circulation pipeline 310 to exchange heat with the formation part 220 to adjust the temperature of the formation part 220. At the same time, in order to prevent the liquid medium from flowing into the formation part 220 and then seeping into the battery cell body, affecting the battery performance, a sealing member 400 is arranged on the formation part 220. The sealing member 400 has an avoidance position and a blocking position. When injecting electrolyte into the battery cell body, the sealing member 400 moves to the avoidance position. After the injection is completed, the sealing member 400 moves to the blocking position. By setting the sealing member 400, during the battery formation temperature control process, the sealing performance of the formation part 220 is ensured, and thus the production quality of the battery is ensured.

[0033] Specifically, in order to improve the temperature control accuracy of the liquid cooling assembly 300, the circulation pipeline 310 is arranged around the formation part 220; or, the circulation pipeline 310 includes a plurality of temperature adjustment branches 311, and each temperature adjustment branch 311 is attached to the bottom surface or side surface of the formation part 220. By arranging the circulation pipeline 310 around the formation part 220, or each temperature adjustment branch 311 is respectively attached to the bottom surface or side surface of the formation part 220, the temperature distribution of the formation part 220 is made uniform, and thus the formation effect of the battery cell body is improved.

[0034] In the process of specific implementation, such as Figure 2As shown in the figure, the circulation pipeline 310 includes: a main liquid inlet pipe 312 extending along the length direction of the cabinet body 100; a first liquid inlet branch pipe 313 communicating with the main liquid inlet pipe 312, the first liquid inlet branch pipe 313 extending along the width direction of the cabinet body 100, and the first liquid inlet branch pipe 313 being attached to the first side surface of the forming component 220; a second liquid inlet branch pipe 314 communicating with the first liquid inlet branch pipe 313, the second liquid inlet branch pipe 314 extending along the height direction of the cabinet body 100, and the second liquid inlet branch pipe 314 being attached to the second side surface of the forming component 220; wherein, at least two second liquid inlet branch pipes 314 are communicated with one first liquid inlet branch pipe 313, and an avoidance space 315 for avoiding the forming assembly 200 is arranged between each second liquid inlet branch pipe 314 and the first liquid inlet branch pipe 313. With such a setting, after the forming component 220 is placed into the cabinet body 100, temperature control is realized for the first side surface and the second side surface of the forming component 220 respectively. By setting the second liquid inlet branch pipes 314 to be at least two, the two second liquid inlet branch pipes 314 can respectively be attached to two forming components 220 in two groups of forming assemblies 200.

[0035] In order to avoid the generation of condensed water on the circulation pipeline 310, a heat insulation layer is coated on the circulation pipeline 310, and a pressure detection component is arranged on the circulation pipeline 310 for detecting the sealing performance inside the circulation pipeline 310.

[0036] Specifically, the forming assembly 200 further includes: a tray 230, a plurality of placement stations 231 are arranged on the tray 230, and each placement station 231 is used for placing the forming component 220. The tray 230 is arranged on the cabinet body 100, and the circulation pipeline 310 is attached to the tray 230. In the specific implementation process, a plurality of forming components 220 are respectively arranged on each tray 230, and a plurality of trays 230 are placed on the cabinet body 100 to process the battery cells. The circulation pipeline 310 is directly attached to the tray 230, so as to control the temperature of a plurality of forming components 220 on the tray 230. Among them, the first liquid inlet branch pipe 313 and the second liquid inlet branch pipe 314 are respectively attached to the tray 230.

[0037] In the embodiment provided by the present application, as Figure 3As shown in the figure, the formation device further includes: a fan assembly 500 disposed within the cabinet 100. The fan assembly 500 includes an air outlet passage 510 for blowing air flow into the cabinet 100. Among them, the fan assembly 500 is disposed at the top of the cabinet 100, and the air outlet of the air outlet passage 510 faces the bottom surface of the cabinet 100. The fan assembly 500 is combined with the liquid cooling assembly 300 to make the temperature distribution in the entire cabinet 100 more uniform. After the liquid cooling assembly 300 operates, the generated cold / hot air is circulated in the entire cabinet 100 by the fan assembly 500. The fan assembly 500 is preferably disposed at the top of the cabinet 100, and the air outlet of the air outlet passage 510 faces the bottom surface of the cabinet 100, so as to realize air supply in the cabinet 100 from top to bottom.

[0038] Further, the fan assembly 500 further includes: an air induction passage 520, in which an air induction component 521 is disposed for introducing the air flow in the cabinet 100 into the air induction passage 520; a heat exchange passage 530, in which a heat exchanger is disposed, and both ends of the heat exchange passage 530 are respectively communicated with the air induction passage 520 and the air outlet passage 510. In this way, the air flow in the cabinet 100 is drawn into the heat exchange passage 530 through the air induction passage 520 for heat exchange, and then blown out through the air outlet passage 510, which further ensures that the ambient temperature in the cabinet 100 is always maintained within the preset temperature range. And under the action of the air flow, the water vapor generated by the liquid cooling assembly 300 can be quickly evaporated, reducing the humidity in the cabinet 100. A heat exchanger is disposed in the heat exchange passage 530. After the air flow in the air induction passage 520 exchanges heat through the heat exchanger, the temperature decreases, and the cold air flows from bottom to top, taking away the heat of the formation component 200, and then is introduced into the air induction passage 520 to complete a complete cycle.

[0039] In specific implementation, as Figure 6 shown, the formation part 220 includes: a liquid storage cup 221 for storing electrolyte. A communication channel 2210 is provided on the liquid storage cup 221, and at least part of the sealing component 400 is disposed in the communication channel 2210. The position of the sealing component 400 is movably disposed to avoid or block the communication channel 2210. When the sealing component 400 is in the avoidance position, electrolyte is injected into the battery cell body through the communication channel 2210. After the injection is completed, the sealing component 400 blocks the communication channel 2210, so that the sealing component 400 is in the blocking position to ensure the sealing performance of the liquid storage cup 221.

[0040] The sealing component 400 includes: a sealing plug 410, at least part of which is arranged in the connecting channel 2210; a support frame 420, which is arranged in the liquid storage cup 221; an elastic component 430, which is arranged on the support frame 420, and the two ends of the elastic component 430 are respectively connected to the support frame 420 and the sealing plug 410, and the elastic force of the elastic component 430 is used to push the sealing plug 410 into the connecting channel 2210. By setting the elastic component 430, under the action of the elastic restoring force of the elastic component 430, the sealing plug 410 is pushed to remain in the connecting channel 2210 and in a blocked state, thereby preventing water vapor from entering the battery cell from the connecting channel 2210.

[0041] In one embodiment provided in the present application, as Figure 4 As shown in FIG. 1 , preferably, there are at least two connecting channels 2210, each of which is provided with a sealing plug 410, and the elastic component 430 is provided in one-to-one correspondence with each sealing plug 410, and each elastic component 430 is provided on the support frame 420 for installation. The elastic component 430 is preferably a spring.

[0042] Preferably, the cross-sectional area of ​​the flow section of the communication channel 2210 gradually decreases from the inside to the outside of the liquid storage cup 221, and at least part of the surface of the sealing plug 410 fits the channel wall of the communication channel 2210. In this way, when the sealing plug 410 moves from the avoidance position to the blocking position, the change in the cross-sectional area of ​​the flow section of the communication channel 2210 can be used to guide the sealing plug 410 to a certain extent, and at the same time, it can also ensure that the sealing plug 410 can completely block the communication channel 2210.

[0043] Specifically, at least part of the channel wall surface of the communication channel 2210 is a conical surface, and at least part of the surface of the sealing plug 410 is in contact with the channel wall surface. Preferably, the channel wall surface of the communication channel 2210 is a conical surface; the sealing plug 410 is a conical structure or a truncated cone structure. In this way, the conical surface is used to guide the sealing plug 410 during its movement.

[0044] ​​In the specific implementation process, the formation component 220 further includes a formation cover 222, which is sleeved on the liquid storage cup 221. The formation cover 222 is detachably connected to the liquid storage cup 221. The formation device further includes: an ejection component 630, which is arranged in the formation cover 222. The ejection component 630 abuts against the sealing component 400 and pushes the sealing component 400 to a position where the communication channel 2210 is avoided, so that the formation cover 222 and the liquid storage cup 221 are in a connected state. When injecting electrolyte, the formation cover 222 is sleeved on the liquid storage cup 221. At this time, the ejection component 630 contacts the sealing plug 410 and pushes the sealing plug 410 to move downward against the elastic force of the elastic component 430, so that a gap is generated between the sealing plug 410 and the communication channel 2210, and the electrolyte flows into the liquid storage cup 221 through the gap to complete the liquid injection; when the liquid injection is completed, the formation cover 222 is removed. At this time, the ejection component 630 is separated from the sealing plug 410, and the sealing plug 410 gradually moves to the blocking position only under the action of the elastic component 430.

[0045] In this embodiment, the formation device further includes a magnetic core 610, which is arranged in the sealing plug 410; an electromagnetic component 620, which is arranged in the formation cover 222 and above the magnetic core 610. By energizing the electromagnetic component 620, the magnetic force generated by the electromagnetic component 620 pushes the magnetic core 610, and the magnetic core 610 drives the sealing plug 410 to move to avoid the communication channel 2210. By arranging the magnetic core 610 in the sealing plug 410, a magnetic force is generated when the electromagnetic component 620 is energized, and then the magnetic core 610 is pushed to drive the sealing plug 410 to move downward. Among them, the end of the magnetic core 610 opposite to the electromagnetic component 620 is located in the same plane as the end face of the sealing plug 410, or the end of the magnetic core 610 opposite to the electromagnetic component 620 protrudes from the end face of the sealing plug 410, so as to ensure that the electromagnetic force generated by the electromagnetic component 620 can be applied to the magnetic core 610.

[0046] In another embodiment provided by the present application, there are multiple communication channels 2210, and the multiple communication channels 2210 are arranged at intervals on the liquid storage cup 221. There are multiple sealing components 400, and the multiple sealing components 400 are arranged in one-to-one correspondence with the multiple communication channels 2210; there are multiple ejection components 630, and the multiple ejection components 630 are arranged in one-to-one correspondence with the multiple sealing components 400. In this embodiment, each ejection component 630 is arranged to be vertically telescopic, and each ejection component 630 is separately controlled. Each ejection component 630 is arranged in the formation cover 222. During the liquid injection process, only one or several required communication channels 2210 need to be opened. When gas is generated during formation, each ejection component 630 can be controlled to push each sealing component 400 to the avoidance position respectively, so as to achieve rapid exhaust.

[0047] The present application also provides a secondary battery production process, such asFigure 8 As shown, the formation device for secondary batteries applicable to the above embodiments, the secondary battery production process includes: controlling the sealing member 400 in the formation device to move to the avoidance position, so as to inject electrolyte into the battery cell body 210 through the formation member 220 in the formation device; after the electrolyte injection is completed, controlling the sealing member 400 to move to the blocking position to seal the formation member 220; performing charge and discharge on the battery cell body 210 to form a solid electrolyte interface film; after the solid electrolyte interface film is formed, performing high-temperature aging on the battery cell body 210; thereafter, sealing the electrolyte injection port on the battery cell body 210 to obtain a battery; wherein, controlling the ambient temperature of the battery cell body 210 to be 45°C ± 5°C through the liquid cooling component 300 in the formation device. In this way, the temperature in the high-temperature aging step for the battery cell body 210 is 45°C ± 5°C, and the temperature of the battery cell body 210 itself is 40°C to 60°C.

[0048] After the electrolyte injection is completed, the battery cell body is left standing; during the process from injecting electrolyte into the battery cell body 210 to sealing the injection port, the formation member 220 is kept installed on the battery cell body, there is no need to seal the injection port, and there is no need to perform secondary injection of electrolyte into the battery cell body; wherein, the length of the formation member 220 is L1, the width is W1, and the height is H1; the length of the battery cell body 210 is L2, the width is W2, and the height is H2; L1 = (1 to 0.8)L2; W1 = (1 to 0.8)W2; H1 = (1 to 0.8)H2.

[0049] Specifically, the secondary battery production process includes the following steps:

[0050] Controlling the sealing member 400 in the formation device to move to the avoidance position, so as to inject electrolyte into the battery cell body 210 through the formation member 220 in the formation device;

[0051] Wherein, when the liquid storage cup 221 is placed on the battery cell body and the formation cover 222 is buckled on the liquid storage cup 221, the ejecting member 630 in the formation cover 222 pushes the sealing plug 410 downward, so that the sealing plug 410 avoids the communication channel 2210, thereby injecting electrolyte into the battery cell body for the first time.

[0052] After the electrolyte injection is completed, controlling the sealing member 400 to move to the blocking position to seal the formation member 220;

[0053] Wherein, after the electrolyte injection is completed, the formation cover 222 is removed, and the sealing plug 410 is pushed back to the position where it blocks the communication channel 2210 under the action of the elastic member 430. In this state, the battery cell body and the liquid storage cup 221 are an integral whole, and the sealing state of the battery cell body is maintained by using the sealing plug 410.

[0054] Charge and discharge the battery cell body 210 to form a solid electrolyte interface film;

[0055] Among them, formation is the first charging process of the battery, which is used to activate the active substances in the battery and form a solid electrolyte interface film on the negative electrode side. During this process, the liquid storage cup 221 is kept sealed by the sealing plug 410 to prevent the water vapor generated by the liquid cooling component 300 from entering the inside of the battery cell body and affecting the battery quality.

[0056] After forming the solid electrolyte interface film, perform high-temperature aging on the battery cell body 210;

[0057] In this step, ensure that the electrolyte can fully infiltrate the electrode plates, which is beneficial to the stability of the battery performance. Among them, the liquid cooling component 300 is used to control the ambient temperature of the battery cell body and the self-temperature of the battery cell body.

[0058] After that, seal the electrolyte injection port on the battery cell body 210 to obtain the battery.

[0059] In the actual operation process, when injecting the electrolyte for the first time, calculate the amount of electrolyte used. After the first injection, the liquid storage cup 221 of the injection port does not disconnect from the battery cell body and is directly sent to high-temperature infiltration, formation, and aging. Since gas will be generated inside the battery cell body during the formation process, the formation cover 222 is buckled on the liquid storage cup 221 to push open the sealing plug 410, so that the liquid storage cup 221 is connected to negative pressure to discharge the gas. If the liquid cooling component 300 malfunctions during this process, directly remove the formation cover 222 to restore the seal.

[0060] In the prior art, as Figure 9 shown, it mainly includes the following processes: First, inject the electrolyte, and then insert the formation nail into the injection port of the battery cell body. The battery needs to be sealed to prevent electrolyte leakage and external contamination; stand still before formation to ensure that the electrolyte fully infiltrates the positive and negative electrode materials and the separator of the battery; remove the formation nail to ensure that the gas generated inside the battery can be smoothly discharged during the formation process; formation, activate the active substances in the battery, and form a solid electrolyte interface film on the negative electrode side; then insert the formation nail into the injection port of the battery cell body again for sealing and standing still; if secondary injection is required, remove the formation nail, place the battery cell into the electrolyte injection device for secondary injection. Among them, the battery cell body needs to be weighed to calculate the amount of electrolyte for secondary injection. After the secondary injection is completed, seal the injection port to ensure the sealing and safety of the battery.

[0061] Using the formation device of the present application, compared with the prior art formation process, that is, after the first liquid injection is completed, a formation nail is inserted into the liquid injection port of the battery cell body, then left standing before formation, the formation nail is pulled out, the battery cell body is formed, and after formation, the formation nail is inserted into the liquid injection port and left standing; the present application cancels the steps of inserting and pulling out the formation nail, and can directly perform secondary liquid injection by using the liquid storage cup 221, and directly uses the liquid storage cup 221 and the sealing member 400 to achieve sealing and exhaust.

[0062] In the present application, electrolyte is injected into the formation cup with an upper sealing structure before formation, and the entire formation tray is connected to the entire tray of battery cells. After standing, it is sent to the corresponding formation cabinet for formation. After standing, it is sent for secondary liquid injection or not (if liquid injection has been performed in the first injection), and directly completes tray separation after completion. The overall formation area and the standing before and after formation adopt a water-cooled temperature control method without humidity control. After the process is changed, the process is simplified and the plugging and unplugging mechanism can be cancelled; water-cooled temperature control is adopted to achieve overall tray control instead of workshop environment control, which is more energy-saving; by calculating the amount of electrolyte used, the first electrolyte injection and the second electrolyte injection can be combined, further streamlining the process and achieving extreme manufacturing.

[0063] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0064] According to the formation device provided by the present application, it includes a cabinet 100, a formation component 200, a liquid cooling component 300 and a sealing component 400. The formation component 200 is stored on the cabinet 100, the liquid cooling component 300 is arranged on the cabinet 100, the liquid cooling component 300 includes a circulation pipeline 310, and the circulation pipeline 310 is used for circulating a heat exchange medium. At least part of the circulation pipeline 310 is attached to the formation component 200; wherein, the formation component 200 includes a formation part 220, the circulation pipeline 310 is attached to the formation part 220 to adjust the temperature of the formation part 220, and a sealing component 400 is arranged on the formation part 220. The sealing component 400 has an avoidance position and a blocking position, and the sealing component 400 is movably arranged between the avoidance position and the blocking position to make the formation part 220 in an open state or a sealed state. Such a setting can control the temperature of the formation part 220 through the liquid cooling component 300, that is, use the circulation pipeline 310 to exchange heat with the formation part 220 to adjust the temperature of the formation part 220. At the same time, in order to prevent the liquid medium from flowing into the formation part 220 and then seeping into the battery cell body, affecting the battery performance, a sealing component 400 is arranged on the formation part 220. The sealing component 400 has an avoidance position and a blocking position. When injecting electrolyte into the battery cell body, the sealing component 400 moves to the avoidance position. After the liquid injection is completed, the sealing component 400 moves to the blocking position. By setting the sealing component 400, during the battery formation temperature control process, the sealing performance of the formation part 220 is ensured, and thus the production quality of the battery is ensured.

[0065] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A secondary battery formation device, comprising a cabinet (100), wherein a formation component (200) is stored on the cabinet (100), characterized in that: The formation equipment also includes: A liquid cooling component (300) is arranged on the cabinet (100), the liquid cooling component (300) comprises a circulation pipe (310), the circulation pipe (310) is used to circulate a heat exchange medium, and at least a portion of the circulation pipe (310) is in contact with the formation component (200); The formation assembly (200) comprises a formation component (220), and the flow pipe (310) is in contact with the formation component (220) to adjust the temperature of the formation component (220); The formation component (220) is provided with a sealing component (400), the sealing component (400) having an avoidance position for avoiding the formation component (220) and a blocking position for blocking the formation component (220), the sealing component (400) being movably arranged between the avoidance position and the blocking position so that the formation component (220) is in an open state or a sealed state; The formation component (220) comprises: a liquid storage cup (221) for storing electrolyte, the liquid storage cup (221) being provided with a communication channel (2210), at least a portion of the sealing component (400) being provided in the communication channel (2210), a gap being provided between the sealing component (400) and the communication channel (2210), so that the sealing component (400) is in the avoidance position, the sealing component (400) blocks the communication channel (2210), and the sealing component (400) is in the blocking position; The formation component (220) further comprises a formation cover (222), which is arranged on the liquid storage cup (221), and the formation cover (222) is detachably connected to the liquid storage cup (221). The formation equipment further comprises: The ejection component (630) is arranged in the formation cover (222), the ejection component (630) abuts against the sealing component (400), and pushes the sealing component (400) to a position avoiding the communication channel (2210), so that the formation cover (222) and the liquid storage cup (221) are in a connected state.

2. The secondary battery formation equipment according to claim 1, characterized in that: The formation assembly (200) further comprises: A tray (230), wherein a plurality of placement stations (231) are arranged on the tray (230), each of the placement stations (231) is used to place the formation component (200), the tray (230) is arranged on the cabinet (100), and the circulation duct (310) is in contact with the tray (230).

3. The secondary battery formation equipment according to claim 1, characterized in that: The formation equipment also includes: A fan assembly (500) is arranged in the cabinet (100), and the fan assembly (500) comprises an air outlet channel (510), and the air outlet channel (510) is used to blow air into the cabinet (100); wherein the fan assembly (500) is arranged at the top of the cabinet (100), and the air outlet of the air outlet channel (510) faces the bottom surface of the cabinet (100).

4. The secondary battery formation equipment according to claim 1, characterized in that: The sealing component (400) comprises: a sealing plug (410), wherein at least a portion of the sealing plug (410) is disposed within the communication channel (2210); A support frame (420) is arranged in the liquid storage cup (221); An elastic component (430) is arranged on the support frame (420), and two ends of the elastic component (430) are respectively connected to the support frame (420) and the sealing plug (410), and the sealing plug (410) is pushed to be inserted into the connecting channel (2210) by the elastic force of the elastic component (430).

5. The secondary battery formation equipment according to claim 4, characterized in that: In a direction from the inside to the outside of the liquid storage cup (221), the cross-sectional area of ​​the flow cross section of the communication channel (2210) gradually decreases, and at least a portion of the surface of the sealing plug (410) is in contact with the channel wall surface of the communication channel (2210).

6. The secondary battery formation equipment according to claim 1, characterized in that: There are a plurality of the communication channels (2210), and the plurality of the communication channels (2210) are arranged at intervals on the liquid storage cup (221); there are a plurality of the sealing components (400), and the plurality of the sealing components (400) are arranged in a one-to-one correspondence with the plurality of the communication channels (2210); There are a plurality of ejection components (630), and the plurality of ejection components (630) are arranged in a one-to-one correspondence with the plurality of sealing components (400).

7. A secondary battery production process, applicable to the secondary battery formation equipment according to any one of claims 1 to 6, characterized in that: The secondary battery production process comprises: Controlling a sealing component (400) in a formation device to move to an avoidance position, so as to inject electrolyte into the battery cell body (210) through the formation component (220) in the formation device; After the electrolyte injection is completed, the sealing component (400) is controlled to move to a blocking position to seal the formation component (220); Charging and discharging the battery cell body (210) to form a solid electrolyte interface film; After the solid electrolyte interface film is formed, the battery cell body (210) is subjected to high temperature aging; Afterwards, the electrolyte injection port on the battery cell body (210) is sealed to obtain a battery; The ambient temperature of the battery cell body (210) is controlled to be 45°C±5°C by means of a liquid cooling component (300) in the formation equipment.

8. The secondary battery production process according to claim 7, characterized in that: After the electrolyte is injected, the battery cell body is left to stand at high temperature; During the process from injecting electrolyte into the battery body (210) to sealing the injection port, the formation component (220) is kept mounted on the battery body, without sealing the injection port, and without injecting electrolyte into the battery body a second time; The formation component (220) has a length of L1, a width of W1, and a height of H1; The battery cell body (210) has a length of L2, a width of W2, and a height of H2; L1=(1~0.8)L2; W1=(1~0.8)W2; H1=(1~0.8)H2.

Images