CN113300017B - Battery formation method and formation device - Google Patents
Battery formation method and formation device Download PDFInfo
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- CN113300017B CN113300017B CN202110573415.8A CN202110573415A CN113300017B CN 113300017 B CN113300017 B CN 113300017B CN 202110573415 A CN202110573415 A CN 202110573415A CN 113300017 B CN113300017 B CN 113300017B
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- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 123
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000011282 treatment Methods 0.000 claims abstract description 78
- 239000003792 electrolyte Substances 0.000 claims description 32
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 68
- 229910001416 lithium ion Inorganic materials 0.000 description 68
- 238000006243 chemical reaction Methods 0.000 description 11
- 238000001764 infiltration Methods 0.000 description 6
- 230000008595 infiltration Effects 0.000 description 6
- 238000005086 pumping Methods 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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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
-
- 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
- H01M10/04—Construction or manufacture in general
- H01M10/049—Processes for forming or storing electrodes in the battery container
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
- H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
- H01M50/618—Pressure control
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
- H01M50/691—Arrangements or processes for draining liquids from casings; Cleaning battery or cell casings
-
- 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
-
- 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
Abstract
The invention relates to a battery formation method and a battery formation device, wherein the battery formation method comprises the steps of sequentially carrying out multi-step formation treatment on a battery, and shelving the battery for preset shelving time between every two adjacent steps of formation treatment; each step of formation treatment comprises a first treatment step and a second treatment step which are performed in a circulating manner; the first processing step comprises the steps that when the interior of the battery is in a negative pressure state, the battery is charged for first preset charging time by adopting preset current; the second processing step comprises the step of charging the battery for a second preset charging time by adopting preset current when the interior of the battery is in a normal pressure state; meanwhile, according to the sequence of the step formation treatment, the preset current and the vacuum degree of the negative pressure state in the step formation treatment are set in an increasing mode, and the second preset charging time is shorter than the first preset charging time. The battery formation method provided by the invention not only can timely extract gas, but also can enable the battery to form a better SEI film.
Description
Technical Field
The invention relates to the technical field of battery manufacturing, in particular to a battery formation method, and also relates to a battery formation device for executing the battery formation method.
Background
At present, in order to solve the problem of environmental pollution caused by using traditional energy, people are beginning to advocate clean energy vigorously, and along with this, the technology of lithium ion batteries is rapidly developed. The formation treatment of the lithium ion battery is used as an important step in the manufacturing process of the lithium ion battery, and the quality of the treatment quality has important influence on the safety performance and the service performance of the lithium ion battery.
When the conventional lithium ion battery is subjected to formation treatment, the interior of the battery is vacuumized in the process of charging the lithium ion battery, and gas generated by reaction in the lithium ion battery is pumped out in time, so that the lithium ions can be smoothly separated from the anode, and meanwhile, the lithium ions are dissociated into electrolyte and pass through the diaphragm and are embedded into the cathode, so that the adverse phenomena of black spots, lithium precipitation, insufficient lithium intercalation and the like are effectively solved. However, this method not only easily causes a part of the free Electrolyte to be evacuated, resulting in waste, but also reduces the Electrolyte participating in the chemical reaction, which is not favorable for the formation of the SEI film (short for Solid Electrolyte interface).
Disclosure of Invention
In view of the above, the present invention is directed to a battery formation method, which can timely extract gas generated by internal reaction of a battery and is also beneficial to forming a better SEI film.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a battery formation method comprises the steps of sequentially carrying out multi-step formation treatment on a battery, and allowing the battery to be placed for a preset placing time between every two adjacent steps of formation treatment; wherein:
the formation treatment in each step comprises a first treatment step and a second treatment step which are circularly performed;
the first processing step comprises the steps that when the interior of the battery is in a negative pressure state, the battery is charged by adopting preset current and lasts for first preset charging time;
the second processing step comprises the steps of charging the battery by adopting the preset current when the interior of the battery is in a normal pressure state, and continuing for a second preset charging time;
and according to the sequence of the formation treatment in each step, the preset current and the vacuum degree in the negative pressure state in the formation treatment in each step are set in an increasing mode, and the second preset charging time in the formation treatment in each step is shorter than the first preset charging time.
Further, the battery formation method comprises four steps of formation treatment which are sequentially carried out, wherein the preset current in the formation treatment in the first step is 0.02-0.05C, the first preset charging time is 5-10 s, the second preset charging time is 3-8 s, and the vacuum degree in a negative pressure state is-30 KPa-50 KPa.
Further, the preset current in the formation treatment in the second step is between 0.05 and 0.1C, the first preset charging time is between 5 and 10 seconds, the second preset charging time is between 3 and 8 seconds, and the vacuum degree in a negative pressure state is between-50 and-70 KPa.
Further, in the third step, the preset current in the formation treatment is between 0.2C and 0.33C, the first preset charging time is between 5 and 10s, the second preset charging time is between 3 and 8s, and the vacuum degree in a negative pressure state is between-70 KPa and-90 KPa.
Further, the preset current in the formation treatment in the fourth step is between 0.33C and 0.5C, the first preset charging time is between 5 and 10s, the second preset charging time is between 3 and 8s, and the vacuum degree in a negative pressure state is between-70 KPa and-90 KPa.
Further, the formation time of the first formation treatment is 25-35 min; in the second step, the formation time of the formation treatment is 15-25 min; thirdly, the formation time of the formation treatment is 15-25 min; and the formation time of the formation treatment in the fourth step is 45-55 min.
Further, the preset standing time is 1-5 min.
Further, in the first processing step, the interior of the battery is vacuumized by a vacuumizing device, and the battery enters the negative pressure state; and the number of the first and second groups,
and in the vacuumizing process, the electrolyte flowing out of the battery is stored through the electrolyte buffer part.
Further, in the second processing step, dry nitrogen or dry air is charged into the battery, so that the interior of the battery enters a normal pressure state; and the number of the first and second groups,
and when the normal pressure state is entered, the electrolyte stored in the electrolyte buffer part is caused to flow back into the battery.
Compared with the prior art, the invention has the following advantages:
according to the battery formation method, each formation treatment comprises a first treatment step and a second treatment step which are carried out in a circulating mode, the battery is charged by adopting the preset current when the interior of the battery is in a negative pressure state in the first treatment step, and the battery is charged by adopting the preset current when the interior of the battery is in a normal pressure state in the second treatment step, so that gas generated by the reaction in the battery can be extracted in time, and the extracted electrolyte can continuously flow back to the interior of the battery to participate in infiltration and chemical reaction, and a better SEI film can be formed.
In addition, another objective of the present invention is to provide a battery formation device, which includes a power supply, a vacuum pumping device, an electrolyte buffer portion, a gas source and a controller; wherein:
the power supply is used for charging the battery;
the vacuumizing device is used for vacuumizing the interior of the battery;
the electrolyte buffer part is arranged between the battery and the vacuumizing device and is used for storing electrolyte flowing out of the battery during vacuumizing;
the gas source is connected with the battery through a control valve and is used for filling gas into the battery;
the controller is used for controlling the power supply, the vacuumizing device and the control valve to act so as to execute the battery formation method.
Compared with the prior art, the battery formation device and the battery formation method have the same beneficial effects, and are not repeated herein.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a battery formation device according to an embodiment of the present invention in a state of being connected to a lithium ion battery;
FIG. 2 is a diagram illustrating the relationship between the vacuum (P), the predetermined current (I) and the time (T) in each step of the formation process according to an embodiment of the present invention.
Description of reference numerals:
1. a lithium ion battery; 2. a negative pressure suction nozzle; 3. caching a cup; 4. a vacuum pump; 5. a gas source; 6. and (4) controlling the valve.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless otherwise specifically limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in conjunction with specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The embodiment first relates to a battery formation device, a battery subjected to formation processing by the battery formation device is specifically a lithium ion battery 1, and in the overall structure, referring to fig. 1, the battery formation device includes a power supply, a vacuum pumping device, an electrolyte buffer storage part, an air source 5 and a controller.
Wherein the power supply is used for charging the lithium ion battery 1, which is not shown in fig. 1. The vacuum-pumping device is used for vacuum-pumping the interior of the lithium ion battery 1, and as a specific implementation manner, the vacuum-pumping device of the present embodiment specifically adopts a vacuum pump 4. The electrolyte buffer part is arranged between the lithium ion battery 1 and the vacuum pump 4 and is used for storing the electrolyte flowing out of the lithium ion battery 1 during vacuum pumping.
As a feasible implementation manner, the electrolyte buffer part of the present embodiment is specifically a buffer cup 3 disposed above the lithium ion battery 1, and a closed buffer cavity for buffering the electrolyte is formed inside the buffer cup. In addition, the bottom end of the buffer cup 3 is communicated with the interior of the lithium ion battery 1 through the negative pressure suction nozzle 2, and the top end of the buffer cup is connected with the vacuum pump 4 through a vacuum tube. Wherein, when the concrete implementation, negative pressure suction nozzle 2 adopts current structure can.
The gas source 5 of the present embodiment is connected to the lithium ion battery 1 through the control valve 6, and is configured to charge gas into the lithium ion battery 1, so that the interior of the lithium ion battery 1 enters a normal pressure state. The gas of the gas source 5 may be dry nitrogen or dry air. The controller is in signal connection with the power supply, the vacuum pump 4 and the control valve 6 to control the power supply, the vacuum pump 4 and the control valve 6 to act, so that the starting and stopping of the vacuum pump 4 and the connection and disconnection between the air source 5 and the lithium ion battery 1 are realized, and the formation method of the lithium ion battery 1 is executed as follows.
From the above description of the battery formation device, when the embodiment is used specifically, the battery formation device is specifically used for formation processing of the lithium ion battery 1, and the corresponding battery formation method mainly includes sequentially performing multi-step formation processing on the lithium ion battery 1, and leaving the lithium ion battery 1 for a preset leaving time between each adjacent step of formation processing.
The formation treatment comprises a first treatment step and a second treatment step which are carried out in a circulating mode, wherein the first treatment step comprises the step of charging the lithium ion battery 1 by adopting preset current when the interior of the lithium ion battery 1 is in a negative pressure state, and the first preset charging time is continued. The second processing step includes charging the lithium ion battery 1 with a preset current for a second preset charging time when the interior of the lithium ion battery 1 is in a normal pressure state. And according to the sequence of the step formation processing, the preset current and the vacuum degree of the negative pressure state in the step formation processing are set in an increasing mode, and in addition, the second preset charging time in the step formation processing is smaller than the first preset charging time.
As a specific embodiment, the present embodiment is described by taking as an example that the battery formation method includes four formation processes performed in sequence, and the relationship among the vacuum degree (P), the preset current (I) and the time (T) in each formation process of the battery formation method is shown in fig. 2, where the horizontal line shown in fig. 2 represents the preset current (I). Of course, the battery formation method of the present embodiment may include five steps, six steps, and other multi-step processes besides the four steps described below.
Specifically, the lithium ion battery 1 may be generally left for a certain time before the first formation treatment, for example, the lithium ion battery may be left for 1 to 5min, and may be left for 1min, 2min, or 5min, as the case may be. The preset shelf time for shelf between two adjacent formation treatments is also 1-5 min, and can be 1min, 2min or 5min and the like according to specific conditions.
And then, carrying out first-step formation treatment, wherein in the formation process, the preset current is between 0.02C and 0.05C, the first preset charging time is between 5 and 10s, the second preset charging time is between 3 and 8s, the vacuum degree in a negative pressure state is between-30 and-50 kPa, and the formation time of the step is between 25 and 35 min.
And after standing for 1-5 min, carrying out second-step formation treatment, wherein in the formation process, the preset current is 0.05-0.1 ℃, the first preset charging time is 5-10 s, the second preset charging time is 3-8 s, the vacuum degree is-50-70 kPa, and the formation time in the step is 15-25 min.
And after standing for 1-5 min, carrying out a third formation treatment, wherein in the formation process, the preset current is 0.2-0.33C, the first preset charging time is 5-10 s, the second preset charging time is 3-8 s, the vacuum degree is-70-90 kPa, and the formation time in the step is 15-25 min.
And after standing for 1-5 min, carrying out a fourth step of formation treatment, wherein in the formation process, the preset current is 0.33-0.5C, the first preset charging time is 5-10 s, the second preset charging time is 3-8 s, the vacuum degree is-70-90 kPa, and the formation time in the step is 45-55 min.
In addition, in order to better explain the battery formation method of the embodiment, based on the above description, the following is a more specific embodiment, and the battery formation method specifically includes the following steps:
and S1, charging the lithium ion battery 1 at a current of 0.02C in the first step of formation treatment, vacuumizing the lithium ion battery 1 to-30 kPa by using a vacuum pump 4 in the first treatment step, entering a negative pressure state, and continuing for 10S. And in the process of vacuumizing, the electrolyte flowing out of the lithium ion battery 1 is stored through the buffer cup 3.
Then, in the second processing step, dry nitrogen or dry air is charged into the lithium ion battery 1, so that the interior of the lithium ion battery 1 is in a normal pressure state for 8 seconds. When the lithium ion battery enters the normal pressure state, the negative pressure suction nozzle 2 is communicated with the bottom of the cache cup 3, and the vacuum pump 4 breaks the vacuum, so that the electrolyte stored in the cache cup 3 flows back to the lithium ion battery 1 to participate in infiltration and chemical reaction.
And circularly performing the first treatment step and the second treatment step until the charging time is 25min, stopping charging, and standing for 1 min.
And S2, charging the lithium ion battery 1 with a current of 0.05C in the second step of formation treatment, vacuumizing the lithium ion battery 1 to-50 kPa by using a vacuum pump 4 in the first treatment step, entering a negative pressure state, and continuing for 10S. And in the process of vacuumizing, the electrolyte flowing out of the lithium ion battery 1 is stored through the buffer cup 3.
Then, in the second processing step, dry nitrogen or dry air is charged into the lithium ion battery 1, so that the interior of the lithium ion battery 1 is in a normal pressure state for 8 seconds. When the lithium ion battery enters the normal pressure state, the negative pressure suction nozzle 2 is communicated with the bottom of the cache cup 3, and the vacuum pump 4 breaks the vacuum, so that the electrolyte stored in the cache cup 3 flows back to the lithium ion battery 1 to participate in infiltration and chemical reaction.
And circularly performing the first treatment step and the second treatment step until the charging is stopped after 15min, and standing for 1 min.
And S3, in the third step of formation treatment, charging the lithium ion battery 1 with a current of 0.2C, in the first treatment step, vacuumizing the lithium ion battery 1 to-70 kPa by using a vacuum pump 4, entering a negative pressure state, and continuing for 10S. And in the process of vacuumizing, the electrolyte flowing out of the lithium ion battery 1 is stored through the buffer cup 3.
Then, in the second processing step, dry nitrogen or dry air is charged into the lithium ion battery 1, so that the interior of the lithium ion battery 1 is in a normal pressure state for 8 seconds. When the lithium ion battery enters the normal pressure state, the negative pressure suction nozzle 2 is communicated with the bottom of the cache cup 3, and the vacuum pump 4 breaks the vacuum, so that the electrolyte stored in the cache cup 3 flows back to the lithium ion battery 1 to participate in infiltration and chemical reaction.
And circularly performing the first treatment step and the second treatment step until the charging is stopped after 15min, and standing for 1 min.
And S4, in the fourth step of formation treatment, charging the lithium ion battery 1 at a current of 0.33C, in the first treatment step, vacuumizing the lithium ion battery 1 to-80 kPa by using a vacuum pump 4, entering a negative pressure state, and continuing for 10S. And in the process of vacuumizing, the electrolyte flowing out of the lithium ion battery 1 is stored through the buffer cup 3.
Then, in the second processing step, dry nitrogen or dry air is charged into the lithium ion battery 1, so that the interior of the lithium ion battery 1 is in a normal pressure state for 8 seconds. When the lithium ion battery enters the normal pressure state, the negative pressure suction nozzle 2 is communicated with the bottom of the cache cup 3, and the vacuum pump 4 breaks the vacuum, so that the electrolyte stored in the cache cup 3 flows back to the lithium ion battery 1 to participate in infiltration and chemical reaction.
And (3) circularly performing the first processing step and the second processing step until the lithium ion battery 1 can be charged to 60% SOC (State of Charge) after charging for 45min, stopping charging, and standing for 1min to finish formation processing of the lithium ion battery 1.
Here, it should be noted that, in addition to the specific values shown above, each preset current, each first preset charging time, each second preset charging time, each vacuum degree, and each formation time may be adjusted to other values within the range of the corresponding interval as the case may be.
In the battery formation method of the embodiment, each formation treatment includes a first treatment step and a second treatment step which are performed cyclically, and in the first treatment step, when the inside of the lithium ion battery 1 is in a negative pressure state, the lithium ion battery 1 is charged with a preset current, and in the second treatment step, when the inside of the lithium ion battery 1 is in a normal pressure state, the lithium ion battery 1 is charged with a preset current. Therefore, gas generated by the internal reaction of the lithium ion battery 1 can be timely extracted, and meanwhile, the extracted electrolyte can continuously flow back to the inside of the lithium ion battery 1 to participate in infiltration and chemical reaction, so that a better SEI film can be formed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The battery formation method is characterized by comprising the steps of sequentially carrying out multi-step formation treatment on a battery, and shelving the battery for preset shelving time between every two adjacent steps of formation treatment; wherein:
the formation treatment in each step comprises a first treatment step and a second treatment step which are circularly performed;
the first processing step comprises the steps that when the interior of the battery is in a negative pressure state, the battery is charged by adopting preset current and lasts for first preset charging time;
the second processing step comprises the steps of charging the battery by adopting the preset current when the interior of the battery is in a normal pressure state, and continuing for a second preset charging time;
and according to the sequence of the formation treatment in each step, the preset current and the vacuum degree in the negative pressure state in the formation treatment in each step are set in an increasing mode, and the second preset charging time in the formation treatment in each step is shorter than the first preset charging time.
2. The battery formation method according to claim 1, comprising four steps of the formation process performed in sequence, wherein:
the preset current in the formation treatment in the first step is 0.02-0.05C, the first preset charging time is 5-10 s, the second preset charging time is 3-8 s, and the vacuum degree in a negative pressure state is-30 to-50 kPa.
3. The battery formation method according to claim 2, characterized in that:
in the second step, the preset current in the formation treatment is between 0.05 and 0.1C, the first preset charging time is between 5 and 10 seconds, the second preset charging time is between 3 and 8 seconds, and the vacuum degree in a negative pressure state is between 50 and 70 kPa.
4. The battery formation method according to claim 3, characterized in that:
and thirdly, the preset current in the formation treatment is between 0.2 and 0.33C, the first preset charging time is between 5 and 10 seconds, the second preset charging time is between 3 and 8 seconds, and the vacuum degree in a negative pressure state is between-70 and-90 kPa.
5. The battery formation method according to claim 4, characterized in that:
and fourthly, the preset current in the formation treatment is between 0.33 and 0.5C, the first preset charging time is between 5 and 10s, the second preset charging time is between 3 and 8s, and the vacuum degree in a negative pressure state is between-70 and-90 kPa.
6. The battery formation method according to claim 5, characterized in that:
the formation time of the formation treatment in the first step is 25-35 min;
in the second step, the formation time of the formation treatment is 15-25 min;
thirdly, the formation time of the formation treatment is 15-25 min;
and the formation time of the formation treatment in the fourth step is 45-55 min.
7. The battery formation method according to claim 1, characterized in that:
the preset standing time is 1-5 min.
8. The battery formation method according to any one of claims 1 to 7, characterized in that:
in the first processing step, the interior of the battery is vacuumized through a vacuumizing device so as to enter the negative pressure state; and the number of the first and second groups,
and in the vacuumizing process, the electrolyte flowing out of the battery is stored through the electrolyte buffer part.
9. The battery formation method according to claim 8, characterized in that:
in the second treatment step, dry nitrogen or dry air is filled into the battery, so that the battery enters a normal pressure state; and the number of the first and second groups,
and when the normal pressure state is entered, the electrolyte stored in the electrolyte buffer part is caused to flow back into the battery.
10. A battery formation device is characterized by comprising a power supply, a vacuumizing device, an electrolyte buffer part, an air source (5) and a controller; wherein:
the power supply is used for charging a battery;
the vacuumizing device is used for vacuumizing the interior of the battery;
the electrolyte buffer part is arranged between the battery and the vacuumizing device and is used for storing electrolyte flowing out of the battery during vacuumizing;
the gas source (5) is connected with the battery through a control valve (6) and is used for filling gas into the battery;
the controller is used for controlling the power supply, the vacuum device and the control valve (6) to act so as to execute the battery formation method of any one of claims 1 to 9.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110573415.8A CN113300017B (en) | 2021-05-25 | 2021-05-25 | Battery formation method and formation device |
| PCT/CN2022/090446 WO2022247586A1 (en) | 2021-05-25 | 2022-04-29 | Battery formation method and formation apparatus |
| DE112022000268.9T DE112022000268T5 (en) | 2021-05-25 | 2022-04-29 | Method and device for battery formation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110573415.8A CN113300017B (en) | 2021-05-25 | 2021-05-25 | Battery formation method and formation device |
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| Publication Number | Publication Date |
|---|---|
| CN113300017A CN113300017A (en) | 2021-08-24 |
| CN113300017B true CN113300017B (en) | 2022-04-05 |
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| CN108598581A (en) * | 2018-04-02 | 2018-09-28 | 浙江衡远新能源科技有限公司 | A kind of chemical synthesizing method of soft bag lithium ionic cell |
| CN110661050A (en) * | 2019-09-27 | 2020-01-07 | 安徽益佳通电池有限公司 | Method for improving formation interface of lithium ion battery |
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| CN107768723B (en) * | 2017-08-30 | 2020-09-25 | 中航锂电科技有限公司 | Formation method of lithium ion battery |
| CN107634268A (en) * | 2017-09-13 | 2018-01-26 | 中航锂电（洛阳）有限公司 | A kind of negative pressure formation method of lithium ion battery |
| CN110994056B (en) * | 2019-12-31 | 2022-06-17 | 中盐安徽红四方锂电有限公司 | Formation activation process for high-capacity lithium iron phosphate battery |
| CN113300017B (en) * | 2021-05-25 | 2022-04-05 | 蜂巢能源科技有限公司 | Battery formation method and formation device |
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| CN108598581A (en) * | 2018-04-02 | 2018-09-28 | 浙江衡远新能源科技有限公司 | A kind of chemical synthesizing method of soft bag lithium ionic cell |
| CN110661050A (en) * | 2019-09-27 | 2020-01-07 | 安徽益佳通电池有限公司 | Method for improving formation interface of lithium ion battery |
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