CN216389496U - High-temperature negative-pressure formation device for whole cavity - Google Patents

Abstract

The utility model belongs to the technical field of cylindrical power batteries, and discloses a whole cavity high-temperature negative pressure formation device which comprises a cavity outer cover, wherein an upper probe support is fixedly arranged at the upper end inside the cavity outer cover, upper probes are equidistantly arranged at the lower end of the upper probe support, temperature sensors are arranged at two ends of the top of the upper probe support, and upper support columns are fixedly arranged in the middles of two ends of the bottom of the upper probe support. The utility model achieves the purposes of simple operation, low cost and small risk by the matching work of the structures such as the cavity outer cover, the tray, the cylindrical battery and the like, optimizes the stage vacuumizing mode and controls the amount of the electrolyte to be pumped out; optimizing staged formation, shortening formation time, improving the quality of an SEI film of the battery cell and ensuring the performance of the battery cell; battery rotating equipment can be eliminated, and process equipment is reduced; the tray is simple in design, and the cost can be reduced; the air leakage risk is avoided, the utilization rate of the equipment can be improved, and the production efficiency is improved.

Description

High-temperature negative-pressure formation device for whole cavity

Technical Field

The utility model belongs to the technical field of cylindrical power batteries, and particularly relates to a high-temperature negative-pressure formation device for an entire cavity.

Background

In the conventional formation manufacturing process of the cylindrical battery cell, the adopted process is formed in stages in a stage negative pressure state at a high temperature state, the vacuumizing step is the high vacuum state at the beginning, and then the vacuum degree is reduced step by step, so that the formation process has more steps, the formation time is long, the efficiency is low, the equipment investment is more, and the cost is increased. Secondly, formation is carried out in a high vacuum state in the first step, and the more electrolyte is extracted along with time, so that film formation of the battery cell is influenced, and the performance of the battery cell is influenced.

The formation equipment adopts a single high-temperature negative pressure form, and aims at the liquid injection hole through the suction nozzle on each channel to perform negative pressure formation on the battery, and the structure has the following defects:

1. the battery is required to be rotationally positioned by a battery rotating machine before negative pressure formation, the tray is required to be provided with an anti-slip pad, the position of the tray is prevented from changing in the transferring process, the battery positioning precision is high, the working procedure is complicated, the production difficulty is high, and the air leakage rate and the liquid leakage rate are high;

2. when the battery is replaced, when the position of the battery liquid injection hole is changed, the equipment mechanism needs to be replaced, and the replacement cost is high;

3. the suction nozzle is used for contacting the battery to carry out negative pressure formation, so that electrolyte is remained on the surface of the battery, crystals are generated on the suction nozzle, and the service life and air leakage of the suction nozzle are influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems, and provides a high-temperature negative-pressure forming device for an entire cavity, which has the advantages of simplicity in operation, low cost and small risk.

In order to achieve the purpose, the utility model provides the following technical scheme: a whole cavity high-temperature negative pressure formation device comprises a cavity outer cover, wherein an upper probe support is fixedly mounted at the upper end inside the cavity outer cover, upper probes are mounted at the lower end of the upper probe support in an equal distance mode, temperature sensors are arranged at two ends of the top of the upper probe support, upper support columns are fixedly mounted at the middle parts of two ends of the bottom of the upper probe support, guide rods are fixedly mounted at four corners of the bottom of the upper probe support, a tray support and a lower probe support are movably sleeved at the middle and lower ends of the four guide rods, a lower probe is fixedly mounted at the top of the lower probe support in an equal distance mode, tray guide grooves are fixedly mounted at four corners of the top of the tray support, a tray is movably clamped at the inner side of each tray guide groove, cylindrical batteries are uniformly placed inside the tray, and air cylinders are fixedly mounted at the front side and the rear side of the middle part of the lower probe support, the tops of the two cylinders are fixedly contacted with the upper probe support, a cavity sealing door is arranged on the right side of the cavity outer cover, lower support columns positioned on the periphery of the tray guide groove are arranged at four corners of the tray support frame, a power supply interface is arranged at the left end of the top of the tray support frame, and a negative pressure port is arranged at the upper right corner of an inner cavity of the cavity outer cover;

a temperature sensor for detecting the temperature in the cavity; an upper probe support for fixing the probe; the upper supporting column and the lower supporting column are matched for use to limit the clamp; when the clamp is closed, the guide rod guides the probes, the probes are made of metal and used for charging the battery, the battery is a cylindrical battery in the application, positive and negative electrode posts are respectively arranged on two sides of the battery, and the upper and lower ends of the positive and negative electrode posts respectively need to be in contact with the positive and negative electrodes of the battery; the lower probe is made of metal and used for charging the battery; the air cylinder is connected with the tray support frame and the lower probe support frame together, and when the clamp is closed, the air cylinder lifts the tray and the lower probe to enable the upper probe and the lower probe to tightly press the battery pole column to charge the battery; the power supply interface is connected with the plug on the tray and is a quick-inserting type connector, so that good contact can be ensured, and the battery in the tray is heated; and the negative pressure port is used for pumping negative pressure and breaking vacuum of the cavity.

As a preferred technical scheme of the utility model, the upper probe support is composed of a square plate and a C-shaped block, the upper probes are uniformly mounted on the C-shaped block in a 16 x 5 manner, the upper probe support and the upper probe structure are symmetrically designed with the lower probe and the lower probe support, the upper probe support is integrally limited and fixed by a guide rod, the lower probe support can move up and down under the guidance of the guide rod, and the upper probes and the lower probes are correspondingly distributed and designed.

As a preferred technical solution of the present invention, the cylindrical batteries are uniformly placed in the tray in a 16 × 5 manner, the top and the bottom of the cylindrical batteries are respectively designed corresponding to the upper probe and the lower probe, and the upper support column is located right above the lower support column.

As a preferred technical scheme of the utility model, the middle part of the tray is provided with a heating column, and the contact area between the tray and the cylindrical battery is a non-conductor;

the tray adopts depression heat conduction's metal material to make, punches on the metal sheet, puts into the metal sheet with the heating rod (the principle is that the electric current can produce the heat through resistance), and the heat that the heating rod produced is conducted on the battery through the metal sheet, and this heating rod has a plurality ofly.

As a preferable technical scheme of the utility model, the length and width of the cavity sealing door are larger than the width of the tray, and rubber sealing strips are arranged on four sides of the inner side of the cavity sealing door.

Compared with the prior art, the utility model has the following beneficial effects:

1. the battery and the tray are placed on the tray support frame in advance, then the upper probe and the lower probe are matched to work by means of the auxiliary work of the air cylinder, and meanwhile, the interior of the battery and the tray also need to be subjected to vacuum treatment testing, the stage vacuumizing mode is optimized, and the electrolyte drawing amount is controlled; optimizing staged formation, shortening formation time, improving the quality of an SEI film of the battery cell and ensuring the performance of the battery cell; battery rotating equipment can be eliminated, and process equipment is reduced; the tray is simple in design, and the cost can be reduced; the air leakage risk is avoided, the utilization rate of the equipment can be improved, and the production efficiency is improved.

Drawings

FIG. 1 is a schematic view of the overall interior front of the structure of the present invention;

FIG. 2 is a schematic view of the overall internal side of the present invention.

In the figure: 1. a cavity housing; 2. a temperature sensor; 3. an upper probe holder; 4. an upper support column; 5. a guide bar; 6. an upper probe; 7. a tray; 8. a cylindrical battery; 9. a lower support pillar; 10. a lower probe; 11. a lower probe support; 12. a cavity sealing door; 13. a cylinder; 14. a tray support frame; 15. a power interface; 16. a tray guide groove; 17. and a negative pressure port.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in figures 1 to 2, the utility model provides a whole cavity high-temperature negative pressure formation device, which comprises a cavity outer cover 1, wherein an upper probe support 3 is fixedly arranged at the upper end inside the cavity outer cover 1, upper probes 6 are equidistantly arranged at the lower end of the upper probe support 3, temperature sensors 2 are arranged at two ends of the top of the upper probe support 3, upper support columns 4 are fixedly arranged at the middle parts of two ends of the bottom of the upper probe support 3, guide rods 5 are fixedly arranged at four corners of the bottom of the upper probe support 3, a tray support frame 14 and a lower probe support 11 are movably sleeved at the middle lower ends of the four guide rods 5, lower probes 10 are fixedly arranged at the top of the lower probe support 11 at an equal distance, tray guide grooves 16 are fixedly arranged at four corners of the top of the tray support frame 14, trays 7 are movably clamped at the inner sides of the tray guide grooves 16, cylindrical batteries 8 are uniformly arranged inside the trays 7, air cylinders 13 are fixedly arranged at the front side and the rear side of the middle part of the lower probe support 11, the tops of the two cylinders 13 are fixedly contacted with the upper probe support 3, the right side of the cavity outer cover 1 is provided with a cavity sealing door 12, four corners of the tray support frame 14 are provided with lower support columns 9 positioned at the periphery of the tray guide groove 16, the left end of the top of the tray support frame 14 is provided with a power supply interface 15, and the upper right corner of the inner cavity of the cavity outer cover 1 is provided with a negative pressure port 17;

the temperature sensor 2 detects the temperature in the cavity; the probe support 3 is arranged on the probe support for fixing the probe 6; the upper supporting column 4 is matched with the lower supporting column 9 for use, and the clamp is limited; when the clamp is closed, the guide rod 5 guides the probe 6 which is made of metal and used for charging the battery, the battery is a cylindrical battery 8 in the application, positive and negative electrode posts are respectively arranged on two sides of the battery, and the upper part and the lower part of the positive and negative electrode posts respectively need to be contacted with the positive and negative electrodes of the battery; a lower probe 10, which is made of metal and is used for charging the battery; the air cylinder 13 is connected with the tray support frame 14 and the lower probe support frame 11 together, when the clamp is closed, the air cylinder 13 lifts the tray 7 and the lower probe 10, so that the upper probe and the lower probe tightly press the battery pole to charge the battery; the power interface 15 is connected with the plug on the tray 7 and is a quick-inserting type connector, so that good contact can be ensured, and the battery in the tray can be heated; and the negative pressure port 17 is used for pumping negative pressure and breaking vacuum of the cavity.

Wherein, go up probe holder 3 and comprise square board and C-shaped piece, go up probe 6 and adopt 16 x 5's even installation of form on the C-shaped piece, go up probe holder 3, go up probe 6 structure and probe 10, the design of probe holder 11 structural symmetry down, go up probe holder 3 wholly by guide arm 5 spacing fixed, probe holder 11 can go up and down the activity under the guide of guide arm 5 down, go up probe 6 and the corresponding distribution design of probe 10 down.

Wherein, the cylindrical battery 8 is uniformly placed in the tray 7 in a 16 x 5 mode, the top and the bottom of the cylindrical battery 8 are respectively designed to correspond to the upper probe 6 and the lower probe 10, and the upper support column 4 is positioned right above the lower support column 9.

Wherein, the middle part of tray 7 is provided with the heating post, and tray 7 and cylindrical battery 8 contact area are nonconductor.

Wherein, the length and width value of the cavity sealing door 12 is greater than the width value of the tray 7, and the four sides of the inner side of the cavity sealing door 12 are provided with rubber sealing strips.

In order to achieve the purpose of the application, the following scheme is adopted: injecting 75-85% of electrolyte into the battery cell, standing the battery cell for 36-48 h, vacuumizing and charging, circulating the following steps to obtain the formed battery cell, wherein the vacuumizing mode adopts low vacuum-high vacuum-low vacuum, and the charging current mode adopts low current-high current.

This application is adopting the low vacuum in electric core undercurrent charging earlier stage, takes out a small amount of gas that will produce, along with the increase of the degree of depth of charging, and the gas yield increases, and at this moment need carry out the high vacuum and in time, effectual taking out the gas that produces, avoid gaseous influence SEI film's formation, lead to electric core to have abnormal state, and at last electric core SEI film formation back, the electric current increase, the gas production becomes few, and the low vacuum of reuse is degasified, guarantees that no gas exists in the electric core. Therefore, the time for high vacuum degassing can be effectively reduced, excessive extraction of electrolyte is avoided, and the phenomenon that the electrolyte is insufficient to form SEI film defects to influence the performance of the battery cell is avoided.

Vacuum in each step is in a constant vacuum state, and after pressure is relieved in each step, standing is adopted to enable the electrolyte to flow back into the battery cell;

the electrolyte has the advantages that the electrolyte is selected at a high temperature of 40-60 ℃, the conductivity of the electrolyte is improved, and the viscosity is reduced, so that the reaction speed of the battery cell is increased, negative reactions are reduced, and the formation of an SEI film is promoted;

the negative pressure is-30 KPa to-95 KPa, and the current is 0.01C-0.5C;

firstly, the current is 0.01-0.1C, the charging capacity is 4% -6%, and the negative pressure is-30 KPa to-50 KPa;

secondly, the current is 0.1-0.15C, the charging capacity is 10% -12%, and the negative pressure is-80 KPa to-95 KPa;

thirdly, the current is 0.3-0.5C, the charging capacity is 40-50%, and the negative pressure is-30 KPa to-50 KPa;

standing for 1-10 min;

aiming at the operation, the equipment is provided with a set of control software, and a process flow can be set on the software (the following description in the step is that the current of 0.01C-0.1C is adopted in the first step, the negative pressure is-30 KPa to-50 KPa, the control software on the equipment can control a power supply to generate the current of 0.01C-0.1C to charge a battery, then a vacuum pump pumps the negative pressure of a cavity to 30KPa to-50 KPa, and then the vacuum degree is kept); the operations are manually set and then automatically controlled by software.

The working principle and the using process of the utility model are as follows:

when in specific use: the cavity sealing door 12 is opened, and the tray 7 and the cylindrical battery 8 are put into the tray supporting frame 14 of the negative pressure cavity for description: firstly, the cylindrical battery 8 is put into the tray 7 and then put into the cavity;

in the process that the tray is placed on the tray supporting frame 14, the quick-insertion type connector on the tray is connected with the power supply interface 15 on the clamp through the tray guide groove 16, the cylindrical battery in the tray is electrically heated, and the cavity sealing door 12 is closed;

the vacuum system vacuumizes the cavity through the negative pressure port 17 (the cavity is subjected to tightness detection, the cavity is vacuumized through the vacuum pump, the vacuum source is closed after the set value is reached, and the leakage rate of the vacuum of the cavity is observed (the vacuum is pumped to-90 kpa, the vacuum is qualified within 3kpa in 10 minutes), so that the tightness of the cavity is judged);

the controller controls the cylinder 13 to act, the tray support frame 14 is lifted along the guide rod 5, the lower support column 9 is in contact with the upper support column 4, the upper and lower poles of the cylindrical battery are in contact with the upper probe 6 and the lower probe 10, and then the power supply is started to charge the battery;

after the battery formation process is finished, the power supply and the heating are automatically turned off through the control system, dry air is filled into the cavity through the negative pressure port 17 to break the vacuum of the cavity, the cavity sealing door 12 is opened, and the tray 7 and the cylindrical battery 8 are taken out of the cavity.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (5)

1. The utility model provides a whole cavity high temperature negative pressure ization becomes device, includes cavity dustcoat (1), its characterized in that: the upper end of the interior of the cavity outer cover (1) is fixedly provided with an upper probe support (3), the lower end of the upper probe support (3) is equidistantly provided with an upper probe (6), the two ends of the top of the upper probe support (3) are provided with temperature sensors (2), the middle parts of the two ends of the bottom of the upper probe support (3) are respectively fixedly provided with an upper support column (4), the four corners of the bottom of the upper probe support (3) are respectively and fixedly provided with guide rods (5), the four middle lower ends of the guide rods (5) are movably sleeved with a tray support (14) and a lower probe support (11), the top of the lower probe support (11) is equidistantly and fixedly provided with a lower probe (10), the four corners of the top of the tray support (14) are respectively and fixedly provided with a tray guide groove (16), the inner side of the tray guide groove (16) is movably clamped with a tray (7), and cylindrical batteries (8) are uniformly placed in the interior of the tray (7), equal fixed mounting in both sides has cylinder (13) around probe support (11) lower extreme middle part down, and the top of two cylinders (13) all contacts fixedly with last probe support (3), the right side of cavity dustcoat (1) is provided with cavity sealing door (12), the four corners of tray support frame (14) all is provided with and is located tray guide way (16) outlying lower support column (9), the left end at tray support frame (14) top is provided with power source (15), the upper right corner of cavity dustcoat (1) inner chamber is provided with negative pressure port (17).

2. The whole chamber high-temperature negative-pressure formation device according to claim 1, wherein: go up probe holder (3) and comprise square board and C-shaped piece, go up probe (6) and adopt the even installation in C-shaped piece of 16 x 5's form, go up probe holder (3), go up probe (6) structure and probe (10) down, probe holder (11) structural symmetry design down, it is whole by guide arm (5) spacing fixed to go up probe holder (3), probe holder (11) can go up and down the activity under the guide of guide arm (5) down, go up probe (6) and probe (10) down and correspond the distribution design.

3. The whole chamber high-temperature negative-pressure formation device according to claim 1, wherein: the cylindrical battery (8) is uniformly placed in the tray (7) in a 16 x 5 mode, the top and the bottom of the cylindrical battery (8) are respectively designed to correspond to the upper probe (6) and the lower probe (10), and the upper support column (4) is located right above the lower support column (9).

4. The whole chamber high-temperature negative-pressure formation device according to claim 1, wherein: the middle part of tray (7) is provided with the heating post, and tray (7) and cylinder battery (8) contact area are nonconductor.

5. The whole chamber high-temperature negative-pressure formation device according to claim 1, wherein: the length and width value of the cavity sealing door (12) is greater than the width value of the tray (7), and rubber sealing strips are arranged on four inner sides of the cavity sealing door (12).

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