CN113161656A - Battery cover plate, cover plate and battery liquid injection method - Google Patents
Battery cover plate, cover plate and battery liquid injection method Download PDFInfo
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- CN113161656A CN113161656A CN202110400842.6A CN202110400842A CN113161656A CN 113161656 A CN113161656 A CN 113161656A CN 202110400842 A CN202110400842 A CN 202110400842A CN 113161656 A CN113161656 A CN 113161656A
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- 239000007788 liquid Substances 0.000 title claims abstract description 308
- 238000002347 injection Methods 0.000 title claims abstract description 288
- 239000007924 injection Substances 0.000 title claims abstract description 288
- 238000000034 method Methods 0.000 title claims abstract description 61
- 239000003792 electrolyte Substances 0.000 claims abstract description 143
- 238000004804 winding Methods 0.000 claims abstract description 35
- 230000008569 process Effects 0.000 claims abstract description 31
- 238000004891 communication Methods 0.000 claims description 18
- 238000005086 pumping Methods 0.000 claims description 11
- 230000008859 change Effects 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims description 6
- 238000013022 venting Methods 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 230000008595 infiltration Effects 0.000 abstract description 13
- 238000001764 infiltration Methods 0.000 abstract description 13
- 238000005265 energy consumption Methods 0.000 abstract description 10
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 230000006837 decompression Effects 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 239000012466 permeate Substances 0.000 description 5
- 230000008961 swelling Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000000265 homogenisation Methods 0.000 description 2
- 235000015110 jellies Nutrition 0.000 description 2
- 239000008274 jelly Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Classifications
-
- 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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Filling, Topping-Up Batteries (AREA)
Abstract
The invention relates to the technical field of batteries, and discloses a battery cover plate, a battery and a battery liquid injection method. The battery cover plate is used for plugging two winding cores which are arranged side by side along a first direction in the shell body, the battery cover plate comprises a plate body, the first direction is parallel to the plate body, two liquid injection holes are formed in the plate body, and each liquid injection hole is correspondingly located above one winding core. The battery cover plate can improve the liquid injection speed of a corresponding battery, avoid battery bulging in the liquid injection process, shorten the standing time after liquid injection and reduce the production energy consumption. The battery provided by the invention has the advantages of short production cycle, low energy consumption and good quality by arranging the battery cover plate. The electrolyte injection method has the advantages that when the battery is injected with electrolyte, the electrolyte injection efficiency is high, the electrolyte infiltration efficiency is high, the subsequent standing time can be shortened, and the energy consumption is reduced.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery cover plate, a battery and a liquid injection method of the battery.
Background
The lithium ion battery has the advantages of higher specific energy, no pollution, no memory effect and the like, and is widely applied to the fields of electronic communication, energy storage equipment, electric automobiles, aerospace and the like. The electrolyte is used as a medium for lithium ion migration and charge transfer, is an indispensable important component of a lithium ion battery, and the injection of the electrolyte is also a key step in the production process of the lithium battery.
With the rapid development of the electric automobile industry, the lithium ion battery develops towards the trend of increasing the volume energy density gradually, and the porosity in the shell of the lithium ion battery gradually becomes smaller, so that the electrolyte injection difficulty of the electrolyte is higher, and the time consumption is longer. In the prior art, a square battery includes a case, the case includes a case body and a cover plate 1 ' plugged at an opening of the case body, as shown in fig. 1, two winding cores 2 ' are arranged side by side in the case body along a first direction (i.e. X ' direction), a liquid injection hole 11 ' is arranged at a midpoint of the cover plate 1 ' along the first direction, i.e. the liquid injection hole 11 ' is located right above a gap between the two winding cores 2 ', when liquid is injected into the case body through the liquid injection hole 11 ', an electrolyte part falls on an edge of the first winding core along the first direction, a part falls on the gap of the two winding cores 2 ', and a part falls on an edge of the second winding core along the first direction. That is, for each winding core 2 ', the initial position of the electrolyte infiltrating and permeating on the winding core 2 ' is at the edge of the winding core 2 ', so after the liquid injection is finished, the battery needs to stand for a long time to ensure that the electrolyte infiltrates and permeates the whole winding core, and the manufacturing period of the battery is long. In addition, when liquid is injected through one liquid injection hole, the pressure in the shell is gradually increased, so that the liquid injection speed is low, and the shell is easy to expand and deform.
Therefore, a battery cover, a battery and a method for filling liquid into the battery are needed to solve the above-mentioned problems.
Disclosure of Invention
The first purpose of the present invention is to provide a battery cover plate, which can improve the liquid injection speed of a corresponding battery, avoid battery swelling during the liquid injection process, shorten the standing time after liquid injection, and reduce the production energy consumption.
The second purpose of the invention is to provide a battery, which has the advantages of short production period, low energy consumption and good quality by arranging the battery cover plate.
The third objective of the present invention is to provide a battery electrolyte injection method, which has high electrolyte injection efficiency and high electrolyte infiltration efficiency, and can shorten the subsequent standing time and reduce the energy consumption when injecting the battery.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a battery apron for with two roll up the core shutoff that sets up side by side along the first direction in this body of shell, battery apron includes the body of board, the first direction is on a parallel with the body of board, be provided with two on the body of board and annotate the liquid hole, every it is located one to annotate the correspondence of liquid hole roll up the top of core.
Optionally, the distance from the two liquid injection holes to the center line of the plate body extending along the first direction is equal.
Optionally, the battery cover plate further includes two poles, the two poles are arranged on a central line of the plate body extending along a second direction at intervals, and the second direction is perpendicular to the first direction.
Optionally, the length of the plate body along the second direction is L, and the distance between the liquid injection hole and the pole closer to the liquid injection hole along the second direction is S, where 1/8 ≦ S/L ≦ 1/4.
A battery, comprising a shell body and the battery cover plate as claimed in any one of claims 1 to 4, wherein the battery cover plate is sealed and sealed on the shell body to form a containing cavity, and two winding cores are arranged in the containing cavity side by side along the first direction.
A battery electrolyte injection method for injecting the battery of claim 5, comprising the steps of:
step 10, connecting a first liquid injection cup and a second liquid injection cup to the two liquid injection holes respectively to be communicated with the accommodating cavity respectively;
step 20, respectively injecting electrolyte with preset quantity into the first liquid injection cup and the second liquid injection cup;
step 30, introducing high-pressure gas into the first liquid injection cup and maintaining the pressure for a certain time to inject the electrolyte in the first liquid injection cup into the accommodating cavity, wherein the second liquid injection cup is not communicated with the atmosphere in the process;
step 40, releasing the pressure of the first liquid injection cup and the second liquid injection cup;
step 50, introducing high-pressure gas into the second liquid injection cup and maintaining the pressure for a certain time to inject the electrolyte in the second liquid injection cup into the accommodating cavity, wherein the first liquid injection cup is not communicated with the atmosphere in the process;
step 60, relieving pressure of the first liquid injection cup and the second liquid injection cup;
step 70, repeating the step 30 to the step 60 for preset times;
and 80, blowing the residual electrolyte in the first liquid injection cup and the residual electrolyte in the second liquid injection cup into the accommodating cavity.
Optionally, after step 30 and before step 40, the battery electrolyte injection method further includes:
step 31, releasing the pressure of the first liquid injection cup and the second liquid injection cup;
step 32, pumping negative pressure to the second liquid injection cup and maintaining the pressure for a certain time, wherein the first liquid injection cup is not communicated with the atmosphere in the process;
after step 50 and before step 60, the battery electrolyte injection method further includes:
and step 52, pumping negative pressure and maintaining the pressure of the first liquid injection cup for a certain time, wherein the second liquid injection cup is not communicated with the atmosphere in the process.
Optionally, in step 31, the method for venting the first and second pour cups is: communicating the first liquid injection cup with the second liquid injection cup, and communicating the second liquid injection cup with the atmosphere to realize pressure relief;
Alternatively, after step 10 and before step 20, step 11 is performed in which airtightness is detected, communication between the first liquid-pouring cup and the atmosphere is cut off, communication between the second liquid-pouring cup and the atmosphere is cut off, negative pressure is drawn into the first liquid-pouring cup and/or the second liquid-pouring cup and pressure is maintained for a certain time, and step 20 is started if a pressure change before and after pressure maintenance is within a preset range.
Optionally, before step 10, step 00 is performed, and the battery before liquid injection is weighed and recorded; after step 80 is completed, step 90 is performed, and the battery after filling is weighed and recorded.
The invention has the beneficial effects that:
according to the battery cover plate, the two liquid injection holes are formed in the cover plate, so that when liquid is injected into a corresponding battery through the liquid injection holes, when liquid is injected through one liquid injection hole, gas in a battery shell can be properly discharged through the other liquid injection hole, the electrolyte injection process is smoother, the liquid injection speed is improved, swelling deformation of the battery shell due to overhigh internal pressure can be avoided, and the quality of the battery is improved; because each liquid injection hole is correspondingly positioned above one winding core, namely the electrolyte can directly fall on the upper end surface of the winding core after entering the shell, for the winding core, the electrolyte has a better infiltration initial position, so that the electrolyte can infiltrate and infiltrate the whole winding core more quickly; when annotating the liquid, can follow every notes liquid hole department and respectively pour into some electrolyte into, the infiltration is started from the up end of two book cores respectively to electrolyte, consequently can evenly permeate two book cores more fast, and infiltration efficiency is high to can shorten the battery and annotate the stationary cycle after the liquid, reduce the energy consumption, improve the production efficiency of battery.
The battery provided by the invention has the advantages of short production period, low energy consumption and good quality by arranging the battery cover plate.
According to the liquid injection method, when the battery is injected with liquid, the electrolyte is respectively injected into the accommodating cavity from the two liquid injection holes at different times, so that the electrolyte starts to infiltrate and penetrate from the upper side end faces of the two winding cores respectively, and the electrolyte can uniformly penetrate the two winding cores more quickly; when the first liquid injection cup injects liquid under pressure, the second liquid injection cup is not communicated with the atmosphere, the pressure of the accommodating cavity is increased along with the injection of the electrolyte into the accommodating cavity, and part of gas in the accommodating cavity can pass through the electrolyte in the second liquid injection cup in a bubble form and enter a cavity of the second liquid injection cup, so that the swelling and deformation of the shell body caused by the overlarge pressure in the accommodating cavity are avoided; on the other hand, the second liquid injection cup is not communicated with the atmosphere, so that the accommodating cavity still can be in a state with a certain positive pressure, the positive pressure state can assist in pressing the electrolyte into the pores of the pole piece (the component of the winding core), the infiltration effect of the electrolyte is improved, the standing time after liquid injection is shortened, and the production efficiency is improved; the step of the liquid is annotated in the step of the alternately pressurization of first notes liquid cup and second notes liquid cup and the step of blowing raffinate of repetition guarantees that all electrolyte are all poured into and hold the intracavity to guarantee to annotate the liquid precision.
Drawings
Fig. 1 is a plan view of a prismatic battery provided in the prior art;
FIG. 2 is a top view of a battery provided in accordance with an embodiment of the present invention;
FIG. 3 is a top view of a battery cover plate according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a battery according to an embodiment of the present invention during electrolyte injection;
fig. 5 is a process flow chart of a battery electrolyte injection method according to an embodiment of the present invention.
In the figure:
1' -a cover plate; 11' -liquid injection hole; 2' -a roll core;
1-a battery cover plate; 11-a plate body; 111-liquid injection hole; 112-explosion-proof valve mounting hole; 12-pole column;
2-a winding core;
3-a shell body;
41-first liquid injection cup; 42-a first positive pressure tube; 43-a first negative pressure tube; 44-a first liquid inlet pipe;
51-second liquid injection cup; 52-second positive pressure tube; 53-a second negative pressure tube; 54-a second liquid inlet pipe;
61-communicating tube; 62-air stop valve.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
This embodiment provides a battery cover plate and battery, wherein the battery can be square battery, including the casing, the casing includes casing body 3 and battery cover plate 1, in this embodiment, casing body 3 is the cuboid casing of only a side open-ended, battery cover plate 1 sealing connection holds the chamber in order to form in the opening of casing body 3, as shown in fig. 2, it has two book cores 2 to hold intracavity along first direction (X in fig. 2) side by side, battery cover plate 1 includes board body 11, the opening size of board body 11 and casing body 3 is unanimous, so that the opening of shutoff casing body 3, first direction is on a parallel with board body 11 and is on a parallel with the minor face of board body 11, be provided with two on the board body 11 and annotate liquid hole 111, every annotates liquid hole 111 and is located the top of a book core 2 correspondingly.
When the electrolyte is injected into the shell through the two electrolyte injection holes 111 on the battery cover plate 1 of the embodiment, when one electrolyte injection hole 111 is used for injecting the electrolyte, the other electrolyte injection hole 111 can properly discharge the gas in the shell, so that the electrolyte injection process is smoother, the electrolyte injection speed is improved, the swelling deformation of the shell due to overhigh internal pressure can be avoided, and the quality of the battery is improved; because each liquid injection hole 111 is correspondingly positioned above one winding core 2, namely the electrolyte can directly fall on the upper end surface of the winding core 2 after entering the shell, for the winding core 2, the electrolyte has a better infiltration initial position, so that the electrolyte can infiltrate and infiltrate the whole winding core 2 more quickly; when annotating the liquid operation, can annotate liquid hole 111 from every and respectively pour into some electrolyte into, make electrolyte begin to soak the infiltration from the up end of two book cores 2 respectively, consequently can evenly permeate two book cores 2 more fast, infiltration efficiency is high to can shorten the battery and annotate the stationary cycle after the liquid, reduce the energy consumption, improve the production efficiency of battery. The battery of this embodiment is short in production cycle, low in energy consumption and good in quality by arranging the battery cover plate 1.
Preferably, as shown in fig. 2, the two electrolyte injection holes 111 on the plate body 11 are respectively located at the center position of one winding core 2 along the first direction, that is, after the electrolyte is injected into the shell from the electrolyte injection holes 111, the electrolyte falls at the center position of the end face of the corresponding winding core 2 along the first direction, and the infiltration starts from the center position, so that the efficiency of the electrolyte infiltrating and finishing the winding core 2 can be further improved.
Specifically, in this embodiment, the plate body 11 is an aluminum plate, and the case body 3 is also composed of an aluminum plate, which has a low density, so as to reduce the total weight of the battery and improve the energy density of the battery; in addition, aluminum plate intensity is high, corrosion-resistant, and is effectual to the protection of inside book core 2. As shown in fig. 2, the Y direction in the figure represents the second direction, the second direction is perpendicular to the first direction and is parallel to the long side of the plate body 11, and the two jelly rolls 2 of the battery are symmetrically arranged with the central line of the plate body 11 extending along the second direction, so correspondingly, the distance from the two liquid injection holes 111 to the central line of the plate body 11 extending along the second direction is equal so as to be respectively opposite to the centers of the jelly rolls 2 along the first direction.
Preferably, as shown in FIG. 3, the distance from the pour hole 111 to the edge of the plate body 11 closer thereto in the first direction (i.e., the distance from the pour hole 111 to the long side of the plate body 11 closer thereto) is H, and the length of the side edge of the plate body 11 extending in the first direction (i.e., the short side of the plate body 11) is H, preferably 1/5. ltoreq. H/H. ltoreq. 2/5, i.e., the two pour holes 111 are provided within the size range which is advantageous for securing the structural strength of the entire plate body 11 on the basis of satisfying the correspondence relationship between the pour hole 111 and the winding core 2.
Furthermore, the distance from the two electrolyte injection holes 111 to the center line of the plate body 11 extending along the first direction is equal, that is, the two electrolyte injection holes 111 are respectively located at the two ends of the battery along the second direction, so that the injected electrolyte is also respectively distributed at the two ends of the battery along the second direction, so that the electrolyte can be respectively infiltrated from the two ends of the battery along the second direction, uniform infiltration in the second direction can be more rapidly realized, the standing period after electrolyte injection is reduced, and the manufacturing period of the battery is shortened.
As shown in fig. 2, the battery cover plate 1 further includes two poles 12, and the two poles 12 are disposed at intervals on a central line of the plate body 11 extending along the second direction, i.e., the poles 12 are disposed between the two winding cores 2, so that the two winding cores 2 can be electrically connected to the poles 12. Further, as shown in fig. 3, the plate body 11 is further provided with an explosion-proof valve mounting hole 112, and the explosion-proof valve mounting hole 112 is provided at a midpoint of a connecting line of the two poles 12. The explosion-proof valve mounting hole 112 keeps a certain distance from the two poles 12, so that when the explosion-proof valve is mounted, the position interference between the explosion-proof valve and the poles 12 can be avoided, and the operation is more convenient.
Preferably, as shown in FIG. 3, the length of the plate body 11 in the second direction is L, and the distance from the liquid injection hole 111 to the one of the poles 12 closer thereto in the second direction is S, wherein 1/8 ≦ S/L ≦ 1/4. Therefore, the two poles 12, the two liquid injection holes 111 and the explosion-proof valve mounting hole 112 are uniformly spaced on the plate body 11 in the first direction or the second direction, so that the overall strength of the battery cover plate 1 is uniform, and the safety of the battery is ensured.
The embodiment also provides a battery electrolyte injection method, which is suitable for injecting the battery provided by the embodiment, and specifically, as shown in fig. 4 and 5, the battery electrolyte injection method includes:
step 10, connecting the first liquid injection cup 41 and the second liquid injection cup 51 to the two liquid injection holes 111 respectively so as to be communicated with the containing cavities respectively;
step 20, respectively injecting electrolyte with preset amount into the first liquid injection cup 41 and the second liquid injection cup 51;
step 30, introducing high-pressure gas into the first liquid injection cup 41 and maintaining the pressure for a certain time to inject the electrolyte in the first liquid injection cup into the accommodating cavity, wherein the second liquid injection cup 51 is not communicated with the atmosphere in the process;
step 40, releasing the pressure of the first liquid injection cup 41 and the second liquid injection cup 51;
step 50, introducing high-pressure gas into the second liquid injection cup 51 and maintaining the pressure for a certain time to inject the electrolyte in the second liquid injection cup into the accommodating cavity, wherein the first liquid injection cup 41 is not communicated with the atmosphere in the process;
step 60, releasing the pressure of the first liquid injection cup 41 and the second liquid injection cup 51;
step 70, repeating the step 30 to the step 60 for preset times;
in step 80, the residual electrolyte in the first pouring cup 41 and the residual electrolyte in the second pouring cup 51 are blown into the accommodating chamber.
In the battery electrolyte injection method of the embodiment, the electrolyte is respectively injected into the accommodating cavity from the two electrolyte injection holes 111 at different times, so that the electrolyte starts to infiltrate and permeate from the centers of the two winding cores in the first direction, the electrolyte can permeate the two winding cores 2 more quickly and uniformly, and the overall infiltration efficiency of the electrolyte is improved; when the first liquid injection cup 41 injects liquid under pressure (or the second liquid injection cup 51 injects liquid under pressure), the second liquid injection cup 51 (or the first liquid injection cup 41) is not communicated with the atmosphere, and as the pressure of the containing cavity increases after the electrolyte is injected into the containing cavity, part of the gas in the containing cavity can pass through the electrolyte in the second liquid injection cup 51 (or the first liquid injection cup 41) and enter the cavity at the upper part of the second liquid injection cup 51 (or the first liquid injection cup 41) in the form of bubbles, so that on one hand, the swelling and deformation of the shell body 3 caused by the excessive pressure in the containing cavity are avoided; on the other hand, the second liquid injection cup 51 (or the first liquid injection cup 41) is not communicated with the atmosphere, so that the accommodating cavity is still in a state with a certain positive pressure, and the positive pressure state can assist in pressing the electrolyte into the pores of the pole piece (the component of the winding core 2), so that the infiltration effect of the electrolyte is improved, the standing time after liquid injection is shortened, and the production efficiency is improved; repeating the step of alternately pressurizing and injecting the first injection cup 41 and the second injection cup 51 and the step of blowing the residual liquid ensures that all the electrolyte is injected into the accommodating cavity, thereby ensuring the injection precision.
Specifically, in step 10, the connection between the first pouring cup 41 and the second pouring cup 51 and the corresponding pouring hole 111 is conventional in the prior art, as long as the connection is air-tight, and will not be described herein again.
As shown in FIG. 4, the first liquid inlet pipe 44, the first positive pressure pipe 42 and the first negative pressure pipe 43 are respectively communicated with the first liquid inlet cup 41, and the second liquid inlet pipe 54, the second positive pressure pipe 52 and the second negative pressure pipe 53 are respectively communicated with the second liquid inlet cup 51. In step 20, injecting electrolyte into the first liquid injection cup 41 through the first liquid inlet pipe 44, and after liquid injection, closing a communication port between the first liquid inlet pipe 44 and the first liquid injection cup 41 and not opening; electrolyte is injected into the second liquid injection cup 51 through the second liquid inlet pipe 54, and after liquid injection, the communication port between the second liquid inlet pipe 54 and the second liquid injection cup 51 is closed and is not opened any more. After the electrolyte is poured into the first pouring cup 41 and the second pouring cup 51, part of the electrolyte is automatically poured into the containing cavity under the action of gravity, but as the pressure in the containing cavity increases, the residual electrolyte in the first pouring cup 41 and the residual electrolyte in the second pouring cup 51 cannot automatically enter the containing cavity any more. In the present embodiment, the same amount of electrolyte is poured into the first and second electrolyte pouring cups 41 and 51, but in other embodiments, the amount of electrolyte poured into the first electrolyte pouring cup 41 does not have to be equal to the amount of electrolyte poured into the second electrolyte pouring cup 51, and the sum of the amounts of electrolyte poured into the two electrolyte pouring cups may be equal to the amount of electrolyte required by the battery.
Further, in step 30, high-pressure gas is injected into the first liquid injection cup 41 through the first positive pressure pipe 42 to inject the electrolyte remaining in the first liquid injection cup 41 into the accommodating chamber, and in the process, the first negative pressure pipe 43, the second positive pressure pipe 52 and the second negative pressure pipe 53 are all in a closed state. Specifically, the pressure of the gas injected into the first liquid injection cup 41 is 500-700 Kpa, and the pressure maintaining time is not less than 20s, so that the electrolyte remaining in the first liquid injection cup 41 is rapidly injected into the accommodating cavity, and the electrolyte enters the accommodating cavity and then infiltrates as soon as possible, thereby being beneficial to reducing the backflow amount of the electrolyte in the accommodating cavity when the first liquid injection cup 41 is depressurized.
Preferably, after step 30 and before step 40, further comprising:
step 31, releasing the pressure of the first liquid injection cup 41 and the second liquid injection cup 51;
step 32, pumping negative pressure to the second liquid injection cup 51 and maintaining the pressure for a certain time, wherein the first liquid injection cup 41 is not communicated with the atmosphere in the process;
since the containing chamber is under high pressure in step 30, when the first and second pouring cups 41 and 51 are depressurized in step 31, a part of the electrolyte in the containing chamber will flow back into the first pouring cup 41 under the action of high pressure. Preferably, as shown in FIG. 4, the method for venting the first and second pour cups 41, 51 is: the first and second pour cups 41, 51 are allowed to communicate, and the second pour cup 51 is allowed to communicate with the atmosphere, to allow venting. In step 30, the second liquid injection cup 51 is not communicated with the atmosphere, so that the pressure in the second liquid injection cup 51 is slightly higher than the external atmospheric pressure, that is, the pressure difference between the first liquid injection cup 41 and the second liquid injection cup 51 is smaller than the pressure difference between the first liquid injection cup 41 and the external atmosphere, in this embodiment, the first liquid injection cup 41 is communicated with the second liquid injection cup 51 first and then is depressurized, for the first liquid injection cup 41, the depressurization pressure difference is reduced, and the depressurization path is lengthened, so that the depressurization speed of the first liquid injection cup 41 can be reduced, thereby avoiding the occurrence of the situation that the electrolyte in the containing cavity flows back to the first liquid injection cup 41 in a well-spraying manner due to the excessively high depressurization speed of the first liquid injection cup 41, reducing the backflow amount of the first liquid injection cup 41 in the depressurization process, correspondingly reducing the number of subsequent repeated pressurization, improving the liquid injection efficiency, and further improving the production efficiency of the battery.
Specifically, in this embodiment, the first pouring cup 41 and the second pouring cup 51 are connected through a communication pipe 61, a gas stop valve 62 is arranged between the communication pipes 61, and the first pouring cup 41 and the second pouring cup 51 can be communicated by opening the gas stop valve 62. In this embodiment, the pressure relief time is not less than 30S, so as to ensure that the pressure in the first liquid-pouring cup 41, the second liquid-pouring cup 51 and the accommodating cavity after the pressure relief is close to the external atmospheric pressure. After the pressure release is completed, the air stop valve 62 is closed, and the second liquid-pouring cup 51 is shut off from the atmosphere.
Although the electrolyte in the first liquid injection cup 41 is injected into the accommodating cavity at a high pressure and maintained for a certain period of time in the step 30, the distribution of the electrolyte in the accommodating cavity is concentrated near the first liquid injection cup 41, and the second liquid injection cup 51 is subjected to negative pressure extraction in the step 32, so that not only can part of the gas in the accommodating cavity be extracted, but also the uniform distribution of the electrolyte in the accommodating cavity is facilitated. Specifically, the second liquid pouring cup 51 is evacuated of negative pressure through the second negative pressure pipe 53, and in this process, the second positive pressure pipe 52, the first positive pressure pipe 42, and the first negative pressure pipe 43 are all in a closed state. In this embodiment, the negative pressure is not greater than-70 Kpa and the pressure-holding time is not less than 20s for the second pouring cup 51.
Alternatively, in step 40, when the first liquid pouring cup 41 and the second liquid pouring cup 51 are depressurized, the first liquid pouring cup 41 and the second liquid pouring cup 51 can be directly communicated with the external atmosphere to be depressurized respectively; the air stop valve 62 may be opened to communicate the second pouring cup 51 with the first pouring cup 41 and to communicate the first pouring cup 41 with the atmosphere to release the pressure, which is not specifically limited. In this embodiment, the pressure relief time in step 40 is not less than 30 s.
After the end of step 40, the first pressurized filling and homogenizing process of the first filling cup 41 is completed, and at this time, the second filling cup 51 contains the electrolyte, and the first filling cup 41 contains a part of the reflowed electrolyte. The process of the first pressurized liquid injection and homogenization in the second liquid injection cup 51 is followed by the steps 40 to 60, which is similar to the process of the pressurized liquid injection and homogenization in the first liquid injection cup 41.
In step 50, high-pressure gas is injected into the second liquid injection cup 51 through the second positive pressure pipe 52 to inject the electrolyte in the second liquid injection cup 51 into the accommodating cavity, and in the process, the second negative pressure pipe 53, the first positive pressure pipe 42 and the first negative pressure pipe 43 are all in a closed state. Specifically, the pressure of the gas injected into the second liquid injection cup 51 is 500-700 Kpa, and the pressure maintaining time is not less than 20s, so that the residual electrolyte in the second liquid injection cup 51 is ensured to be injected into the accommodating cavity quickly, and the electrolyte is infiltrated and permeated as soon as possible after entering the accommodating cavity, so that the backflow amount of the electrolyte in the accommodating cavity is reduced when the pressure of the second liquid injection cup 51 is released in the subsequent steps.
Preferably, after step 50 and before step 60, the method further comprises:
since the containing chamber is under high pressure in step 50, when the first and second pour cups 41 and 51 are depressurized in step 51, a portion of the electrolyte in the containing chamber will flow back into the second pour cup 51 under the action of the high pressure. Preferably, as shown in FIG. 4, the method for venting the first and second pour cups 41, 51 is: the second pour cup 51 and the first pour cup 41 are placed in communication, and the first pour cup 41 is placed in communication with the atmosphere to allow venting. In the step 50, the first liquid injection cup 41 is not communicated with the atmosphere, so the pressure in the first liquid injection cup 41 is slightly higher than the external atmospheric pressure, namely the pressure difference between the second liquid injection cup 51 and the first liquid injection cup 41 is smaller than the pressure difference between the second liquid injection cup 51 and the external atmosphere, the second liquid injection cup 51 is communicated with the first liquid injection cup 41 firstly and then is decompressed, for the second liquid injection cup 51, the decompression pressure difference is reduced, and the decompression path is lengthened, so the decompression speed of the second liquid injection cup 51 can be reduced, the situation that the electrolyte in the containing cavity flows back to the second liquid injection cup 51 in a well-spraying manner due to the overhigh decompression speed of the second liquid injection cup 51 is avoided, the backflow amount of the second liquid injection cup 51 in the decompression process is reduced, the subsequent repeated pressurization and liquid injection times can be reduced, the efficiency is improved, and the liquid injection efficiency of the battery is improved.
Similarly, the first and second filler cups 41 and 51 can be connected by opening the air stop valve 62. In this embodiment, the pressure relief time in step 51 is not less than 30S, so as to ensure that the pressure in the first liquid-pouring cup 41, the second liquid-pouring cup 51 and the accommodating cavity after pressure relief is close to the external atmospheric pressure. After the pressure release is completed, the air stop valve 62 is closed, and the first liquid-pouring cup 41 is shut off from the atmosphere.
Although the electrolyte in the second liquid injection cup 51 is injected into the accommodating cavity at a high pressure and maintained for a certain period of time in step 50, at this time, the distribution of the electrolyte in the accommodating cavity is still concentrated near the second liquid injection cup 51, and the first liquid injection cup 41 is subjected to negative pressure extraction in step 52, so that not only can part of the gas in the accommodating cavity be extracted, but also the uniform distribution of the electrolyte in the accommodating cavity is facilitated. Specifically, the first liquid-pouring cup 41 is evacuated of negative pressure through the first negative-pressure pipe 43, and in the process, the first positive-pressure pipe 42, the second positive-pressure pipe 52, and the second negative-pressure pipe 53 are all in the closed state. In this embodiment, the pressure for pumping the negative pressure of the first pouring cup 41 is not more than-70 Kpa, and the pressure maintaining time is not less than 20 s.
Alternatively, in step 60, when the first liquid pouring cup 41 and the second liquid pouring cup 51 are depressurized, the first liquid pouring cup 41 and the second liquid pouring cup 51 can be directly communicated with the external atmosphere to be depressurized respectively; the air stop valve 62 may be opened to allow the second pouring cup 51 to communicate with the first pouring cup 41 and to allow the second pouring cup 51 to communicate with the atmosphere to release the pressure, and the pressure may not be particularly limited. Specifically, the pressure relief time of step 60 is not less than 30 s.
In this embodiment, in step 70, the number of times of repeating steps 30 to 60 is 8 to 48, based on the fact that the amount of the electrolyte remaining in the first liquid injection cup 41 and the amount of the electrolyte remaining in the second liquid injection cup 51 are less than the predetermined value.
Further, in step 80, when the first liquid pouring cup 41 is purged with the residual liquid, the second liquid pouring cup 51 is allowed to communicate with the atmosphere, and at the same time, positive pressure gas is blown into the first liquid pouring cup 41 through the first positive pressure pipe 42 and the pressure is maintained for a certain period of time so that all the electrolyte remaining in the first liquid pouring cup 41 enters the storage chamber. Specifically, at this time, since the second liquid-pouring cup 51 is in communication with the outside air, the high-pressure gas to be blown into the first liquid-pouring cup 41 is not less than 100Kpa, and the pressure holding time is 3 to 10 seconds. Similarly, when blowing the residual liquid into the second liquid pouring cup 51, the first liquid pouring cup 41 is opened to the atmosphere, and positive pressure gas is blown into the second liquid pouring cup 51 and the pressure is maintained for a certain period of time so that all the electrolyte remaining in the second liquid pouring cup 51 enters the storage chamber. Specifically, at this time, since the second liquid-pouring cup 51 is in communication with the outside air, the high-pressure gas to be blown into the first liquid-pouring cup 41 is not less than 100Kpa, and the pressure holding time is 3 to 10 seconds.
Preferably, in order to ensure that the liquid filling process is carried out smoothly, after the first liquid filling cup 41 and the second liquid filling cup 51 are respectively installed on the two liquid filling holes 111, the airtightness of the communication space formed by the first liquid filling cup 41, the containing cavity and the second liquid filling cup 51 needs to be detected, in the present embodiment, after the step 10 and before the step 20, the step 11 is carried out, and the airtightness is detected, specifically, the communication between the first liquid filling cup 41 and the atmosphere is cut off, the communication between the second liquid filling cup 51 and the atmosphere is cut off, negative pressure is pumped out and maintained for a certain time for the first liquid filling cup 41 and/or the second liquid filling cup 51, and if the pressure change before and after the pressure maintaining is within a preset range, the operation of the step 20 is carried out. In this embodiment, the value of the negative pressure extracted by the air-tightness detection is not greater than-95 Kpa, the pressure holding time is not less than 10s, the pressure value change is observed, if the pressure change value is not greater than 0.3Kpa, the air-tightness is qualified, and then the step 20 is performed. If the pressure change value is greater than 0.3Kpa, the airtightness is not qualified, and the checking reason needs to be rechecked. In addition, in the process of detecting the air tightness, the negative pressure pumping can also pump out air among the pores of the pole piece of the winding core 2, so as to facilitate the subsequent soaking of electrolyte.
Preferably, in order to ensure the liquid injection precision of the battery, before the step 10, the step 00 is performed, and the battery before liquid injection is weighed and recorded; and after step 80 is completed, step 90 is performed, and the battery after the liquid injection is weighed and recorded. By comparing the weight difference of the battery before and after liquid injection, the actual liquid injection amount can be accurately calculated, and the liquid injection amount precision of the battery is further ensured. The weighing method before and after battery liquid injection can be carried out according to the prior art, and is not repeated herein.
In summary, the battery electrolyte injection method of the embodiment includes the steps of:
step 00, weighing and recording the battery before liquid injection;
step 10, connecting the first liquid injection cup 41 and the second liquid injection cup 51 to the two liquid injection holes 111 respectively so as to be communicated with the containing cavities respectively;
step 20, respectively injecting electrolyte with preset amount into the first liquid injection cup 41 and the second liquid injection cup 51;
step 30, introducing high-pressure gas into the first liquid injection cup 41 and maintaining the pressure for a certain time to inject the electrolyte in the first liquid injection cup into the accommodating cavity, wherein the second liquid injection cup 51 is not communicated with the atmosphere in the process;
step 31, communicating the first liquid injection cup 41 with the second liquid injection cup 51, and communicating the second liquid injection cup 51 with the atmosphere to release the pressure of the first liquid injection cup 41 and the second liquid injection cup 51;
step 32, pumping negative pressure to the second liquid injection cup 51 and maintaining the pressure for a certain time, wherein the first liquid injection cup 41 is not communicated with the atmosphere in the process;
step 40, releasing the pressure of the first liquid injection cup 41 and the second liquid injection cup 51;
step 50, introducing high-pressure gas into the second liquid injection cup 51 and maintaining the pressure for a certain time to inject the electrolyte in the second liquid injection cup into the accommodating cavity, wherein the first liquid injection cup 41 is not communicated with the atmosphere in the process;
step 60, releasing the pressure of the first liquid injection cup 41 and the second liquid injection cup 51;
step 70, repeating the step 30-step 60 for 8-48 times;
step 80, blowing the residual electrolyte in the first liquid injection cup 41 and the residual electrolyte in the second liquid injection cup 51 into the accommodating cavity;
step 90, weighing and recording the battery after liquid injection.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the invention and are not to be construed as limitations of the embodiments of the present invention, but may be modified in various embodiments and applications by those skilled in the art according to the spirit of the present invention, and the content of the present description should not be construed as a limitation of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The utility model provides a battery cover plate for with two roll up core (2) shutoff that set up side by side along first direction in shell body (3), its characterized in that, battery cover plate includes plate body (11), first direction is on a parallel with plate body (11), be provided with two on plate body (11) and annotate liquid hole (111), every annotate liquid hole (111) and correspond and be located one roll up the top of core (2).
2. The battery lid plate according to claim 1, wherein the two pour holes (111) are equidistant from a center line of the plate body (11) extending in the first direction.
3. The battery cover plate according to claim 1 or 2, further comprising two poles (12), wherein the two poles (12) are spaced apart from each other on a center line of the plate body (11) extending in a second direction perpendicular to the first direction.
4. The battery lid according to claim 3, wherein the length of the plate body (11) in the second direction is L, and the distance from the pour hole (111) to the one of the poles (12) closer thereto in the second direction is S, wherein 1/8 ≦ S/L ≦ 1/4.
5. A battery, characterized in that it comprises a case body (3) and a battery cover plate according to any one of claims 1 to 4, said battery cover plate being sealed to said case body (3) to form a containing cavity in which two winding cores (2) are arranged side by side along said first direction.
6. A battery electrolyte injection method for injecting the battery of claim 5, comprising the steps of:
step 10, connecting a first liquid injection cup (41) and a second liquid injection cup (51) to the two liquid injection holes (111) respectively so as to be communicated with the containing cavities respectively;
step 20, respectively injecting electrolyte with preset quantity into the first liquid injection cup (41) and the second liquid injection cup (51);
step 30, introducing high-pressure gas into the first liquid injection cup (41) and maintaining the pressure for a certain time to inject the electrolyte in the first liquid injection cup into the accommodating cavity, wherein the second liquid injection cup (51) is not communicated with the atmosphere in the process;
step 40, releasing the pressure of the first liquid injection cup (41) and the second liquid injection cup (51);
step 50, introducing high-pressure gas into the second liquid injection cup (51) and maintaining the pressure for a certain time to inject the electrolyte in the second liquid injection cup into the accommodating cavity, wherein the first liquid injection cup (41) is not communicated with the atmosphere in the process;
step 60, releasing the pressure of the first liquid injection cup (41) and the second liquid injection cup (51);
step 70, repeating the step 30 to the step 60 for preset times;
and 80, blowing the residual electrolyte in the first liquid injection cup (41) and the residual electrolyte in the second liquid injection cup (51) into the accommodating cavity.
7. The battery electrolyte injection method according to claim 6, wherein after step 30 and before step 40, the battery electrolyte injection method further comprises:
step 31, releasing the pressure of the first liquid injection cup (41) and the second liquid injection cup (51);
step 32, pumping negative pressure to the second liquid injection cup (51) and maintaining the pressure for a certain time, wherein the first liquid injection cup (41) is not communicated with the atmosphere in the process;
after step 50 and before step 60, the battery electrolyte injection method further includes:
step 51, releasing the pressure of the first liquid injection cup (41) and the second liquid injection cup (51);
and step 52, pumping negative pressure to the first liquid injection cup (41) and maintaining the pressure for a certain time, wherein the second liquid injection cup (51) is not communicated with the atmosphere in the process.
8. The battery electrolyte injection method according to claim 7, wherein the step 31 of venting the first electrolyte injection cup (41) and the second electrolyte injection cup (51) comprises the steps of: communicating the first liquid injection cup (41) with the second liquid injection cup (51), and communicating the second liquid injection cup (51) with the atmosphere to realize pressure relief;
step 51, the method for releasing the pressure of the first liquid injection cup (41) and the second liquid injection cup (51) is as follows: and communicating the second liquid injection cup (51) with the first liquid injection cup (41), and communicating the first liquid injection cup (41) with the atmosphere to realize pressure relief.
9. The battery electrolyte injection method according to any of claims 6-8, wherein after step 10 and before step 20, step 11 is performed in which the airtightness is detected, the communication between the first electrolyte injection cup (41) and the atmosphere is cut off, the communication between the second electrolyte injection cup (51) and the atmosphere is cut off, negative pressure is pumped to the first electrolyte injection cup (41) and/or the second electrolyte injection cup (51) and pressure is maintained for a certain time, and step 20 is started when the pressure change before and after pressure maintenance is within a preset range.
10. The battery electrolyte injection method according to any of claims 6 to 8, wherein, before performing step 10, step 00 is performed, and the battery before electrolyte injection is weighed and recorded; after step 80 is completed, step 90 is performed, and the battery after filling is weighed and recorded.
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| CN202110400842.6A CN113161656A (en) | 2021-04-14 | 2021-04-14 | Battery cover plate, cover plate and battery liquid injection method |
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| CN202110400842.6A CN113161656A (en) | 2021-04-14 | 2021-04-14 | Battery cover plate, cover plate and battery liquid injection method |
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