CN109449495B - Negative pressure formation method and device for lithium battery cavity - Google Patents
Negative pressure formation method and device for lithium battery cavity Download PDFInfo
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- CN109449495B CN109449495B CN201811329052.8A CN201811329052A CN109449495B CN 109449495 B CN109449495 B CN 109449495B CN 201811329052 A CN201811329052 A CN 201811329052A CN 109449495 B CN109449495 B CN 109449495B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention discloses a negative pressure formation method and device for a lithium battery cavity, wherein the method comprises the following steps: 1) Placing the battery cell with the liquid injection into charge-discharge formation equipment; 2) Opening a vacuum valve, and starting to extract vacuum 3) to perform formation charging; 4) After formation charging is completed, closing a vacuum valve, and breaking a vacuum state by using inert gas; 5) Taking the battery out of the charging and discharging equipment to obtain the required lithium battery subjected to negative pressure formation; the device comprises a supporting device, a needle plate assembly, a driving cylinder, a tray and a control device. The beneficial effects of the invention are as follows: the negative pressure requirement of various forms of lithium batteries can be ensured, the alignment of a battery liquid injection hole is not needed, a negative pressure pipeline is not in direct contact with the battery, and the pollution of the previous batch of electrolyte to electricity is avoided. The sealing of the cavity uses the special sealing groove design, so that the sealing performance is better, the negative pressure effect can be better, the working time of the negative pressure pump is shortened, and the energy saving and emission reduction effects are achieved.
Description
Technical Field
The invention relates to a negative pressure formation method and device for a lithium battery cavity.
Background
The lithium battery has the advantages of high energy, small volume, light weight, high specific energy, good safety, flexible design and the like, and is widely applied to new energy automobiles and mobile number products. The lithium battery with partial specification, such as square shell lithium battery, partial cylindrical lithium battery, and the like, needs to be added with a negative pressure process in the formation process, so that the swelling and the size deformation are avoided.
Negative pressure formation is therefore a very important step in the battery production process. During formation, the battery will form an SEI film. The SEI film influences various parameters such as internal resistance, capacity, cycle life, self-discharge level, maximum discharge current and the like of a battery finished product. The SEI film is formed in an irreversible state, so that the advantages and disadvantages of the negative pressure formation process are not only to ensure that the gas generated in the battery formation process is sucked out, but also to avoid physical factors such as swelling deformation of the battery core, poor pole lug compactness and the like; and also determines the compactness, uniformity and consistency of SEI film formation. Therefore, a good negative pressure system is important in the production process of lithium batteries.
With the development of the lithium battery industry, various types of lithium batteries have market demands. There is a need for devices that are compatible for the production of a wide variety of lithium battery products. For each type of lithium battery, the liquid injection hole sites often exist differently. Therefore, the prior negative pressure formation using the suction nozzle mode has the defects of fixed hole site and complicated adjustment. Meanwhile, the suction nozzle is directly contacted with the battery, electrolyte crystallization is generated by the suction nozzle, so that the tightness is poor, and the negative pressure effect is reduced.
Disclosure of Invention
The invention aims to provide a negative pressure formation technology of a lithium battery cavity, which can realize the whole negative pressure process of a battery core and solve the problem that a liquid injection hole is difficult to align with a negative pressure hole due to the specification of a battery. Meanwhile, the phenomenon that the negative pressure loop of a single cell of the cell leaks to cause the whole negative pressure to collapse is avoided. In addition, the fire-fighting effect of monitoring, controlling and external isolation of the battery compartment environment can be achieved.
The negative pressure formation method of the lithium battery cavity comprises the following steps:
1) Placing the lithium battery after liquid injection into the tray, and keeping the upper and lower edges of the outer frame of the tray in sealing contact with the upper and lower needle plates; the tray outer frame is made of sealing electrolyte corrosion resistant materials, a sealing groove is arranged at the contact part of the edge of the outer frame and the needle plate assembly, and the sealing groove is matched with a sealing strip at the needle plate when the air cylinder is closed, so that a double sealing effect is achieved; the detachable inner village of the tray is made of corrosion-resistant materials, is convenient to clean and replace the battery specification, and plays a certain role in restraint and guide;
2) Forming a sealed environment, and airtight testing:
The outer frame of the tray, the upper needle plate and the lower needle plate are tightly pressed and sealed under the drive of the driving cylinder, so that a sealing cavity is formed in the whole tray, and meanwhile, the battery is contacted with the probes on the needle plates;
the pressure in the sealing cavity is regulated, so that the negative pressure value in the sealing cavity is increased to a set value, and the sealing cavity of the tray is subjected to air tightness test to ensure the air tightness of the sealing cavity;
3) Charging and negative pressure formation:
After the air tightness detection, starting a chemical charging process of the lithium batteries placed in the tray, and starting a negative pressure process;
4) Control of negative pressure value:
In the formation process, monitoring and adjusting the negative pressure value in the sealing cavity in real time so that the negative pressure value is kept stable;
5) Breaking vacuum:
after the formation charging process is finished or when an abnormal alarm is given, inert gases such as nitrogen and the like or atmosphere are injected into the sealing cavity so as to break the vacuum state of the sealing cavity;
4) Discharging:
After the negative pressure formation is completed, the tray leaves from the warehouse to complete the negative pressure formation.
Further, the air tightness test in step 2) comprises the steps of:
① Adjusting the pressure in the sealing cavity to enable the negative pressure value in the sealing cavity to rise to a set value, wherein the set value is-90 kps;
② After the set negative pressure value is stabilized for a set time, measuring the negative pressure value of the closed environment again, wherein the actual value of the negative pressure value is more than 10kps larger than the negative pressure set value, and the air tightness can be determined to be good; otherwise, the air tightness is poor.
The set value of the negative pressure value is-90 kps, and the set time is 60s.
The device constructed by the lithium battery cavity negative pressure formation method is characterized in that: comprises a supporting device, a needle plate assembly, a driving cylinder, a tray and a control device,
The supporting device comprises a supporting plate, supporting guide rods and a sliding block, wherein holes for the probes to pass through are formed in the supporting plate so as to contact with the battery electrodes, and a plurality of supporting guide rods which are perpendicular to the supporting plate and are in rotary connection with the supporting plate are arranged on the supporting plate; the support guide rod is in threaded connection with a sliding block, the sliding block is fixedly arranged on the support plate, and the sliding block can move up and down along the axis of the support guide rod under the drive of the driving cylinder so as to adjust the distance between the needle plate components;
The upper needle plate assembly and the lower needle plate assembly are respectively arranged at the top ends of the supporting guide rods, the lower needle plate assembly is fixedly arranged under the supporting plates, the upper needle plate assembly and the lower needle plate assembly are kept parallel to the supporting plates, probes for contacting with battery electrodes are fully distributed on the inner end surfaces of the upper needle plate assembly and the lower needle plate assembly, and the inner end surfaces of the upper needle plate assembly and the inner end surfaces of the lower needle plate assembly are respectively arranged oppositely and are used for contacting and sealing with the upper edge and the lower edge of the tray; the driving cylinder is arranged on the supporting plate, and an output shaft of the driving cylinder is connected with the supporting guide rod through the transmission assembly so as to drive the supporting guide rod to rotate; at least one set of plate body of the needle plate assembly is provided with a vent hole for communicating with an external air source and a negative pressure hole for communicating with a vacuum pump, wherein the negative pressure hole is used for extracting air in the sealed cavity to form a vacuum environment in the sealed cavity, and the vent hole is used for breaking the vacuum environment in the sealed cavity;
the tray comprises a tray outer frame and a tray lining, wherein the tray outer frame is detachably connected with the tray lining arranged in the tray outer frame, and sealing grooves for contact sealing with the upper needle plate assembly and the lower needle plate assembly are formed in the upper edge and the lower edge of the tray outer frame along the circumferential direction; a plurality of clamping grooves for placing lithium batteries are formed in the end face of the inner lining of the tray; when the upper needle plate assembly and the lower needle plate assembly press the upper edge and the lower edge of the tray outer frame, the upper needle plate assembly, the lower needle plate assembly and the tray outer frame enclose a sealing cavity for placing a battery;
The control device comprises a controller, a man-machine operation interface and a negative pressure sensor, wherein the negative pressure sensor is arranged on a pipeline connected with a negative pressure hole, a signal input end of the controller is in signal connection with the man-machine operation interface, and a signal output end of the controller is electrically connected with a control end of the driving cylinder, a control end of the vacuum pump and a signal output end of the negative pressure sensor.
Further, a temperature sensor for detecting the temperature in the sealing cavity is arranged on the plate body of the needle plate assembly, and the signal output end of the temperature sensor is electrically connected with the signal input end of the controller.
Further, the sealing strip matched with the sealing groove of the outer frame edge of the tray is embedded in the edge of the inner end face of the needle plate assembly along the circumferential direction and is used for sealing between the edge of the inner end face of the needle plate assembly and the edge of the tray.
Further, a fire-fighting spraying port which can be communicated with an external spraying device is arranged on the plate body of the needle plate assembly and is used for spraying cooling liquid into the sealing cavity so as to cool the sealing cavity.
Further, an electromagnetic valve and a throttle valve are assembled on a pipeline connected with the negative pressure hole, and the control end of the electromagnetic valve is electrically connected with the signal output end of the controller and used for controlling the negative pressure value in the sealing cavity.
The invention has the beneficial effects that:
(1) The negative pressure forming device can be widely used for negative pressure forming of various specification battery cells, and the negative pressure forming can not be performed or the negative pressure effect can not meet the process requirements because the specification of the battery cells is not changed or the battery cells can not be aligned to the liquid injection hole;
(2) The negative pressure hole is not in direct contact with the battery, so that the reduction of tightness caused by electrolyte crystallization is avoided, the starting time of a negative pressure pump is shortened, and the effects of energy conservation and emission reduction are achieved;
(3) The negative pressure value can be monitored and controlled. The negative pressure value can be regulated in different chemical stages;
(4) The negative pressure suction nozzle, the collecting cup and the busbar system are not required to be cleaned and replaced. The tray and the needle plate assembly can be integrally pulled out for cleaning, so that manpower resources are saved;
(5) The inner lining and the outer lining of the sealing tray are designed, and the outer lining is firm and corrosion-resistant. The inner village is corrosion-resistant and detachable, is used for changing the specification of the battery cell, and plays a role in guiding and restraining the battery cell;
(6) The number of negative pressure components is reduced, and each cell is provided with one set of electrolyte buffer collection cup, so that one set of electrolyte buffer collection cup is changed into one set of tray, and the cost is saved;
(7) The effect of the whole negative pressure system is reduced due to the fact that a certain cell liquid injection hole and a negative pressure port are inclined, and the number of the cells of the tray is insufficient due to the fact that unqualified cells are taken away in the tray;
(8) The environment of the battery compartment is sealed, so that the external environment interference can be isolated;
(9) Plays a role in closed fire control, can perform fire control, spray and extinguish fire for the first time, and avoids disaster diffusion.
Drawings
Fig. 1a is a front view of the present invention.
Fig. 1b is a side view of the present invention.
Fig. 1c is a top view of the present invention.
FIG. 1d is a cross-sectional view A-A of FIG. 1 c.
Fig. 2a is a structural view of the tray of the present invention.
Fig. 2b is a side view of the tray of the present invention.
Fig. 2c is a cross-sectional view A-A of fig. 2 b.
Fig. 3a is a front view of the upper needle plate assembly of the present invention.
Fig. 3b is a top view of the upper needle plate assembly of the present invention.
Fig. 3c is a front view of the upper needle plate assembly of the present invention.
Fig. 3d is a side view of the upper needle plate assembly of the present invention.
Fig. 4a is a front view of the lower needle plate assembly of the present invention.
Fig. 4b is a top view of the lower needle plate assembly of the present invention.
Fig. 4c is a front view of the lower needle plate assembly of the present invention.
Fig. 4d is a side view of the lower needle plate assembly of the present invention.
Fig. 5 is a schematic diagram of negative pressure control logic.
Detailed Description
The invention will be further described with reference to the accompanying drawings
Referring to the drawings:
embodiment 1 the negative pressure formation method of the lithium battery cavity of the invention comprises the following steps:
1) Placing the lithium battery after liquid injection into the tray, and keeping the upper and lower edges of the outer frame of the tray in sealing contact with the upper and lower needle plates; the tray outer frame is made of sealing electrolyte corrosion resistant materials, a sealing groove is arranged at the contact part of the edge of the outer frame and the needle plate assembly, and the sealing groove is matched with a sealing strip at the needle plate when the air cylinder is closed, so that a double sealing effect is achieved; the detachable inner village of the tray is made of corrosion-resistant materials, is convenient to clean and replace the battery specification, and plays a certain role in restraint and guide;
2) Forming a sealed environment, and airtight testing:
The outer frame of the tray, the upper needle plate and the lower needle plate are tightly pressed and sealed under the drive of the driving cylinder, so that a sealing cavity is formed in the whole tray, and meanwhile, the battery is contacted with the probes on the needle plates;
the pressure in the sealing cavity is regulated, so that the negative pressure value in the sealing cavity is increased to a set value, and the sealing cavity of the tray is subjected to air tightness test to ensure the air tightness of the sealing cavity;
3) Charging and negative pressure formation:
After the air tightness detection, starting a chemical charging process of the lithium batteries placed in the tray, and starting a negative pressure process;
4) Control of negative pressure value:
In the formation process, monitoring and adjusting the negative pressure value in the sealing cavity in real time so that the negative pressure value is kept stable;
5) Breaking vacuum:
after the formation charging process is finished or when an abnormal alarm is given, inert gases such as nitrogen and the like or atmosphere are injected into the sealing cavity so as to break the vacuum state of the sealing cavity;
6) Discharging:
After the negative pressure formation is completed, the tray leaves from the warehouse to complete the negative pressure formation.
Further, the air tightness test in step 2) comprises the steps of:
① Adjusting the pressure in the sealing cavity to enable the negative pressure value in the sealing cavity to rise to a set value, wherein the set value is-90 kps;
② After the set negative pressure value is stabilized for a set time, the negative pressure value of the closed environment is measured again, and the actual value of the negative pressure value is kept above-80 kps, so that the air tightness can be considered to be good; otherwise, the air tightness is poor; the set time was 60s.
Example 2 the device constructed according to the negative pressure formation method of lithium battery cavity of example 1 comprises a supporting device 1, a needle plate assembly 2, a driving cylinder 3, a tray 4 and a control device,
The supporting device 1 comprises a supporting plate 11, a supporting guide rod 12 and a sliding block 13, wherein a hole for a probe to pass through is formed in the supporting plate 11 so as to contact with an electrode of the battery 5, and a plurality of supporting guide rods 12 which are perpendicular to the supporting plate and are rotatably connected with the supporting plate 11 are arranged on the supporting plate 11; the support guide rod 12 is in threaded connection with a sliding block 13, the sliding block 13 is fixedly arranged on the support plate 12, and can move up and down along the axial direction of the support guide rod 12 under the drive of the driving cylinder 3 so as to adjust the distance between needle plate components;
the needle plate assemblies 2 are two sets, namely an upper needle plate assembly 21 and a lower needle plate assembly 22, the upper needle plate assembly 21 is arranged at the top end of the supporting guide rod 12, the lower needle plate assembly 22 is fixedly arranged under the supporting plate 11, the upper needle plate assembly 21 and the lower needle plate assembly 22 are kept parallel to the supporting plate 11, the inner end surfaces of the upper needle plate assembly 21 and the inner end surfaces of the lower needle plate assembly 22 are fully distributed with probes for contacting with electrodes of the battery 5, and the inner end surfaces of the upper needle plate assembly 21 and the inner end surfaces of the lower needle plate assembly 22 are respectively oppositely arranged and are used for contacting and sealing with the upper edge and the lower edge of the tray 4; the driving cylinder 3 is arranged on the supporting plate 11, and an output shaft of the driving cylinder 3 is connected with the supporting guide rod through a transmission assembly to drive the supporting guide rod 12 to rotate; at least one set of plate body of the needle plate assembly 2 is provided with a vent hole 23 for communicating with an external air source and a negative pressure hole 24 for communicating with a vacuum pump, wherein the negative pressure hole 24 is used for extracting air in the sealed cavity to form a vacuum environment in the sealed cavity, and the vent hole 23 is used for breaking the vacuum environment in the sealed cavity; the tray 4 comprises a tray outer frame 41 and a tray inner liner 42, the tray outer frame 41 is detachably connected with the tray inner liner 42 arranged in the tray outer frame, and sealing grooves 411 for contacting and sealing with the upper needle plate assembly and the lower needle plate assembly are formed in the upper edge and the lower edge of the tray outer frame 41 along the circumferential direction; the end face of the tray lining 42 is provided with a plurality of clamping grooves for placing lithium batteries; when the upper needle plate assembly 21 and the lower needle plate assembly 22 press the upper edge and the lower edge of the tray outer frame 41, the upper needle plate assembly 21 and the lower needle plate assembly 22 enclose a sealing cavity for placing batteries;
The control device comprises a controller, a man-machine operation interface and a negative pressure sensor, wherein the negative pressure sensor is arranged on a pipeline connected with a negative pressure hole, a signal input end of the controller is in signal connection with the man-machine operation interface, and a signal output end of the controller is electrically connected with a control end of the driving cylinder, a control end of the vacuum pump and a signal output end of the negative pressure sensor.
Further, a temperature sensor 25 for detecting the temperature in the sealing cavity is arranged on the plate body of the needle plate assembly 2, wherein a signal output end of the temperature sensor 25 is electrically connected with a signal input end of the controller.
Further, the inner end surface edge of the needle plate assembly 2 is embedded with a sealing strip 26 matched with a sealing groove 411 of the outer frame edge of the tray along the circumferential direction, so as to realize the sealing between the inner end surface edge of the needle plate assembly and the edge of the tray.
Further, a fire-fighting spraying port 27 which can be communicated with an external spraying device is arranged on the plate body of the needle plate assembly 2 and is used for spraying cooling liquid into the sealing cavity so as to cool the sealing cavity.
Further, a solenoid valve and a throttle valve are assembled on a pipeline connected with the negative pressure hole 24, and a control end of the solenoid valve is electrically connected with a signal output end of the controller and is used for controlling a negative pressure value in the sealing cavity.
Specifically, fig. 1 is a schematic cavity diagram, and after the cylinder is closed, the upper needle plate assembly, the tray and the lower needle plate assembly are closed; the gap is sealed by the sealing ring in fig. 3, so that a closed cavity is formed. And the probes on the upper needle plate assembly and the lower needle plate assembly are contacted with the battery.
The tray in fig. 2 is divided into a tray frame and a detachable tray for placing a certain number of batteries. The tray lining is replaceable and is used for adapting to the battery cores with different specifications and plays a certain role in guiding and restraining.
The needle plate assembly of fig. 3 is integrally detachable: the inner end surface of the plate body is fully covered with probes, and the installation position of the plate body is determined by the specification of the battery. The edge of the plate body is embedded with a sealing ring and is used for contacting with the tray outer frame to form a sealing cavity; the plate body is provided with a temperature sensor for detecting the temperature in the sealing cavity; the negative pressure hole on the plate body is used for controlling the negative pressure value in the sealing cavity; the fire-fighting spraying port on the plate body is used for reducing the temperature in the sealing cavity, and the plate body can be internally introduced with nitrogen through the breaking vacuum hole to break the vacuum environment of the sealing cavity.
In the formation process, the negative pressure hole is connected with a negative pressure pipeline to pump out the gas in the cavity to form a negative pressure state, so that the negative pressure formation of the battery is ensured. After the formation charging process is finished or before the cylinder needs to be opened, the vacuum breaking hole is subjected to vacuum breaking operation, so that normal air pressure in the cavity is recovered, and the cylinder is opened.
When the combustion condition of the battery core of the battery occurs in the charging process, the spraying device is operated after the temperature sensor confirms, and the danger is handled in time. Because of the package of the needle plate and the tray outer frame, the spreading of disasters can be controlled at the first time, and enough time is obtained for manual treatment.
Embodiment 3 adopts the control unit used in fig. 5 in the negative pressure control. The negative pressure control process comprises the following steps:
1) According to the negative pressure flow, a negative pressure value is issued, and when the negative pressure is more than a set value of 10kps, the negative pressure valve is closed; when the negative pressure is less than 10kps of the set value, the negative pressure valve is opened, and the negative pressure value slowly rises under the action of the throttle valve;
2) Changing the negative voltage value according to the average voltage of the battery; because the battery cell is formed in different stages, the generated gases are different in type and volume; evaluating the formed stage state by the collected average voltage of the tray battery cell, thereby automatically adjusting the state to a corresponding negative pressure set value;
3) Setting negative pressure according to the flow time; and setting negative pressure values of different time periods according to the standard curve of the formed battery cell.
Since the interior of the chamber is in a low vacuum state, three ways of heat transfer: heat transfer, heat convection, heat radiation, only heat radiation is present. Therefore, in order to achieve the heat dissipation effect of the battery, after the temperature sensor detects that the heat dissipation threshold value is reached, the nitrogen valve is opened, the nitrogen valve slowly enters the cavity under the action of the throttle valve, and the air convection heat dissipation is formed under the condition that the vacuum degree is not damaged.
The embodiments described in the present specification are merely examples of implementation forms of the inventive concept, and the scope of protection of the present invention should not be construed as being limited to the specific forms set forth in the embodiments, but also equivalent technical means that can be conceived by those skilled in the art according to the inventive concept.
Claims (8)
1. Lithium cell cavity negative pressure becomes device, its characterized in that: comprises a supporting device, a needle plate assembly, a driving cylinder, a tray and a control device,
The supporting device comprises a supporting plate, supporting guide rods and a sliding block, wherein holes for the probes to pass through are formed in the supporting plate so as to contact with the battery electrodes, and a plurality of supporting guide rods which are perpendicular to the supporting plate and are in rotary connection with the supporting plate are arranged on the supporting plate; the support guide rod is in threaded connection with a sliding block, the sliding block is fixedly arranged on the support plate, and the sliding block can move up and down along the axis of the support guide rod under the drive of the driving cylinder so as to adjust the distance between the needle plate components;
The upper needle plate assembly and the lower needle plate assembly are respectively arranged at the top ends of the supporting guide rods, the lower needle plate assembly is fixedly arranged under the supporting plates, the upper needle plate assembly and the lower needle plate assembly are kept parallel to the supporting plates, probes for contacting with battery electrodes are fully distributed on the inner end surfaces of the upper needle plate assembly and the lower needle plate assembly, and the inner end surfaces of the upper needle plate assembly and the inner end surfaces of the lower needle plate assembly are respectively arranged oppositely and are used for contacting and sealing with the upper edge and the lower edge of the tray; the driving cylinder is arranged on the supporting plate, and an output shaft of the driving cylinder is connected with the supporting guide rod through the transmission assembly so as to drive the supporting guide rod to rotate; at least one set of plate body of the needle plate assembly is provided with a vent hole for communicating with an external air source and a negative pressure hole for communicating with a vacuum pump, wherein the negative pressure hole is used for extracting air in the sealed cavity to form a vacuum environment in the sealed cavity, and the vent hole is used for breaking the vacuum environment in the sealed cavity; the tray comprises a tray outer frame and a tray lining, wherein the tray outer frame is detachably connected with the tray lining arranged in the tray outer frame, and sealing grooves for contact sealing with the upper needle plate assembly and the lower needle plate assembly are formed in the upper edge and the lower edge of the tray outer frame along the circumferential direction; a plurality of clamping grooves for placing lithium batteries are formed in the end face of the inner lining of the tray; when the upper needle plate assembly and the lower needle plate assembly press the upper edge and the lower edge of the tray outer frame, the upper needle plate assembly, the lower needle plate assembly and the tray outer frame enclose a sealing cavity for placing a battery;
The control device comprises a controller, a man-machine operation interface and a negative pressure sensor, wherein the negative pressure sensor is arranged on a pipeline connected with a negative pressure hole, a signal input end of the controller is in signal connection with the man-machine operation interface, and a signal output end of the controller is electrically connected with a control end of the driving cylinder, a control end of the vacuum pump and a signal output end of the negative pressure sensor.
2. The apparatus according to claim 1, wherein: the needle plate assembly comprises a needle plate body, wherein the needle plate assembly is characterized in that a temperature sensor for detecting the temperature in the sealing cavity is arranged on the needle plate body, and a signal output end of the temperature sensor is electrically connected with a signal input end of the controller.
3. The apparatus according to claim 1, wherein: the sealing strip matched with the sealing groove at the edge of the outer frame of the tray is embedded at the edge of the inner end face of the needle plate assembly along the circumferential direction and is used for sealing between the edge of the inner end face of the needle plate assembly and the edge of the tray.
4. The apparatus according to claim 1, wherein: the plate body of the needle plate assembly is provided with a fire-fighting spray port which can be communicated with an external spray device and is used for spraying cooling liquid into the sealing cavity to cool the sealing cavity.
5. The apparatus according to claim 1, wherein: the pipeline that the negative pressure hole links to each other is equipped with solenoid valve and choke valve to the control end of solenoid valve with the signal output part electricity of controller is connected for the negative pressure value in the control seal chamber.
6. A lithium battery cavity negative pressure formation method using the lithium battery cavity negative pressure formation device of claim 1, comprising the steps of:
1) Placing the lithium battery after liquid injection into the tray, and keeping the upper and lower edges of the outer frame of the tray in sealing contact with the upper and lower needle plates;
2) Forming a sealed environment, and airtight testing:
The outer frame of the tray, the upper needle plate and the lower needle plate are tightly pressed and sealed under the drive of the driving cylinder, so that a sealing cavity is formed in the whole tray, and meanwhile, the battery is contacted with the probes on the needle plates;
the pressure in the sealing cavity is regulated, so that the negative pressure value in the sealing cavity is increased to a set value, and the sealing cavity of the tray is subjected to air tightness test to ensure the air tightness of the sealing cavity;
3) Charging and negative pressure formation:
After the air tightness detection, starting a chemical charging process of the lithium batteries placed in the tray, and starting a negative pressure process;
4) Control of negative pressure value:
In the formation process, monitoring and adjusting the negative pressure value in the sealing cavity in real time so that the negative pressure value is kept stable;
5) Breaking vacuum:
after the formation charging process is finished or when an abnormal alarm is given, inert gases such as nitrogen and the like or atmosphere are injected into the sealing cavity so as to break the vacuum state of the sealing cavity;
6) Discharging:
After the negative pressure formation is completed, the tray leaves from the warehouse to complete the negative pressure formation.
7. The method of claim 6, wherein: the air tightness test in step 2) comprises the following steps:
① Adjusting the pressure in the sealing cavity to enable the negative pressure value in the sealing cavity to rise to a set value, wherein the set value is-90 kps;
② After the set negative pressure value is stabilized for a set time, measuring the negative pressure value of the closed environment again, wherein the actual value of the negative pressure value is more than 10kps larger than the negative pressure set value, and the air tightness can be determined to be good; otherwise, the air tightness is poor.
8. The method of claim 6, wherein: in step ②: the negative pressure set value is-90 kps; the set time was 60s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811329052.8A CN109449495B (en) | 2018-11-09 | 2018-11-09 | Negative pressure formation method and device for lithium battery cavity |
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|---|---|---|---|
| CN201811329052.8A CN109449495B (en) | 2018-11-09 | 2018-11-09 | Negative pressure formation method and device for lithium battery cavity |
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| CN109449495A CN109449495A (en) | 2019-03-08 |
| CN109449495B true CN109449495B (en) | 2024-07-19 |
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| CN109856541B (en) * | 2019-03-21 | 2021-04-06 | 宁波市鄞州特尔斐电子有限公司 | Formation and capacity grading detection equipment for distributed battery |
| CN110474100B (en) * | 2019-07-22 | 2024-04-16 | 深圳市精实机电科技有限公司 | Quick change type structure of lithium battery formation composition equipment |
| CN111490306B (en) * | 2020-04-16 | 2021-08-10 | 海口安博尔能源技术开发有限公司 | Device and method for negative pressure formation of soft package lithium ion battery |
| CN113363655A (en) * | 2021-06-03 | 2021-09-07 | 宜春清陶能源科技有限公司 | Secondary packaging device and secondary packaging method for soft package battery |
| CN113447218B (en) * | 2021-09-01 | 2021-11-23 | 苏州华智诚精工科技有限公司 | Battery leakage detection method, structure and system |
| CN117848602B (en) * | 2023-12-31 | 2024-06-14 | 同技智能装备(嘉兴)有限公司 | New energy automobile battery tray is with leakproofness detection equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107706461A (en) * | 2017-10-12 | 2018-02-16 | 合肥国轩高科动力能源有限公司 | Negative pressure formation method for power lithium ion battery |
| CN207052723U (en) * | 2017-08-16 | 2018-02-27 | 微宏动力系统（湖州）有限公司 | Formation of Li-ion batteries case |
| CN209487635U (en) * | 2018-11-09 | 2019-10-11 | 浙江杭可科技股份有限公司 | Lithium battery cavity negative pressure formation device |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101887994B (en) * | 2009-05-15 | 2012-08-29 | 深圳市鸿德电池有限公司 | Vacuum formation method of lithium ion battery |
| KR101488043B1 (en) * | 2010-04-23 | 2015-01-29 | 주식회사 엘지화학 | Method for activating high capacity lithium secondary battery |
| CN203553288U (en) * | 2013-11-08 | 2014-04-16 | 合肥国轩高科动力能源股份公司 | Square aluminum shell lithium battery negative-pressure formation auxiliary device |
| CN106058297A (en) * | 2016-08-12 | 2016-10-26 | 合肥国轩高科动力能源有限公司 | Vacuum forming device for power battery |
| CN206134850U (en) * | 2016-11-03 | 2017-04-26 | 珠海泰坦新动力电子有限公司 | A square power lithium battery negative pressure needle bed modular structure |
| CN107464956A (en) * | 2017-08-17 | 2017-12-12 | 云南锡业集团（控股）有限责任公司 | A kind of new process for making of lithium ion battery |
| CN207587895U (en) * | 2017-12-11 | 2018-07-06 | 合肥国轩高科动力能源有限公司 | Power lithium battery vacuum pumping device |
| CN108417920B (en) * | 2018-03-21 | 2023-09-01 | 浙江杭可科技股份有限公司 | Power battery formation negative pressure equipment |
| CN108598579B (en) * | 2018-03-28 | 2020-09-01 | 深圳市新浦自动化设备有限公司 | Battery vacuum formation mechanism |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207052723U (en) * | 2017-08-16 | 2018-02-27 | 微宏动力系统（湖州）有限公司 | Formation of Li-ion batteries case |
| CN107706461A (en) * | 2017-10-12 | 2018-02-16 | 合肥国轩高科动力能源有限公司 | Negative pressure formation method for power lithium ion battery |
| CN209487635U (en) * | 2018-11-09 | 2019-10-11 | 浙江杭可科技股份有限公司 | Lithium battery cavity negative pressure formation device |
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