CN114388893A - Long-circulation soft package power battery formation method and long-circulation soft package power battery - Google Patents
Long-circulation soft package power battery formation method and long-circulation soft package power battery Download PDFInfo
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- CN114388893A CN114388893A CN202111553128.7A CN202111553128A CN114388893A CN 114388893 A CN114388893 A CN 114388893A CN 202111553128 A CN202111553128 A CN 202111553128A CN 114388893 A CN114388893 A CN 114388893A
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- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 56
- 238000007600 charging Methods 0.000 claims abstract description 103
- 238000010277 constant-current charging Methods 0.000 claims abstract description 18
- 238000009489 vacuum treatment Methods 0.000 claims abstract description 12
- 210000004027 cell Anatomy 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 7
- 238000010280 constant potential charging Methods 0.000 claims description 6
- 210000005056 cell body Anatomy 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 10
- 229910001416 lithium ion Inorganic materials 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical group [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 3
- 206010027146 Melanoderma Diseases 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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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
- H01M10/052—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
-
- 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
-
- 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 long-circulation soft package power battery formation method and a long-circulation soft package power battery, which comprise the following steps: at a preset temperature, performing constant current charging on the battery by adopting a first current; judging whether the charging state of the battery meets a first preset condition or not; if the first preset condition is met, taking out the battery from the formation cabinet, and carrying out vacuum treatment; after the vacuum treatment is finished, the battery is placed in the formation cabinet again; and charging the battery to a second preset condition at a preset temperature by adopting the first current. The invention can effectively solve the problem of black spots generated in the formation process of the battery, has low requirements on environment and equipment, can effectively ensure the formation effect, can ensure the safety of the battery, can also improve the reliability of the battery, and prolongs the service life of the battery.
Description
Technical Field
The invention relates to the technical field of battery formation, in particular to a long-cycle soft package power battery formation method and a long-cycle soft package power battery.
Background
With the adjustment and growth of the market of power batteries, the characteristics of high energy density and long endurance require that the thickness and the volume of the battery core tend to be thicker and more developed.
The soft packet of power lithium ion battery of tradition becomes the in-process and produces more gas, and gas piles up between positive plate, negative pole piece, diaphragm, leads to this regional positive, negative pole piece can not the in close contact with, and the unable normal embedding of lithium ion, this region easily forms black spot, and the capacity of black spot department can't exert, and the lithium ion can here pile up through long-time charge-discharge cycle, produces the potential safety hazard.
In order to solve the problem, the conventional methods include an opening formation method and a negative pressure formation method, but the opening formation method has high requirements on environment or equipment, and the humidity of air entering the battery cell in the opening process must be ensured to be low enough, otherwise, the formation effect cannot be ensured. The negative pressure formation method is to vacuumize in the formation process to enable the inside of the battery cell to be in a negative pressure state and remove generated gas, but the requirement on equipment is high, and the conventional soft package hot pressing formation cabinet does not have the function.
Disclosure of Invention
The invention aims to solve the technical problem of providing a long-cycle soft package power battery formation method and a long-cycle soft package power battery aiming at the defects of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a long-circulation soft package power battery formation method is constructed, and the method comprises the following steps:
at a preset temperature, performing constant current charging on the battery by adopting a first current;
judging whether the charging state of the battery meets a first preset condition or not;
if the first preset condition is met, taking the battery out of the formation cabinet, and carrying out vacuum treatment;
after the vacuum treatment is completed, the battery is placed in the formation cabinet again;
and charging the battery to a second preset condition at the preset temperature by adopting the first current in a constant current mode.
In the formation method of the long-cycle soft package power battery, after the constant-current charging of the battery at the preset temperature by using the first current is carried out to a second preset condition, the formation method further comprises the following steps:
charging the battery by adopting a second current, and judging whether the charging state of the battery meets a third preset condition or not;
and if the third preset condition is met, charging the battery to a fourth preset condition by adopting a third current.
In the formation method of the long-cycle soft package power battery, the first current includes: 0.05-0.10C; the first preset condition includes: the charging quantity of the battery is 7% -10%; or the charging cut-off voltage of the battery is 3.35-3.55V.
In the formation method of the long-cycle soft package power battery, the judging whether the charging state of the battery meets a first preset condition includes:
judging whether the charging amount of the battery reaches 7% -10%;
if so, judging that the charging state of the battery meets the first preset condition;
or judging whether the charge cut-off voltage of the battery reaches 3.35-3.55V or not;
and if the voltage reaches 3.35-3.55V, judging that the charging state of the battery meets the first preset condition.
In the formation method of the long-cycle soft package power battery, the battery comprises the following steps: a cell body and an air pocket; the taking out of the battery from the formation cabinet and the vacuum treatment comprises the following steps:
taking the battery out of the formation cabinet;
keeping the airbag facing upwards;
vacuumizing the air bag by adopting a preset vacuum degree;
and after vacuumizing for a preset time period, stopping vacuumizing, and finishing the sealing treatment of the airbag.
In the formation method of the long-cycle soft package power battery, the preset vacuum degree is as follows: -60Kpa to-100 Kpa; the preset time period is as follows: 10 to 20 seconds.
In the formation method of the long-cycle soft-package power battery, the second preset condition includes: the charging amount of the battery is 3% -5%; or the charging cut-off voltage of the battery is 3.45-3.65V.
In the formation method of the long-cycle soft package power battery, the constant-current charging of the battery to a second preset condition at the preset temperature by using the first current comprises the following steps:
charging the battery at the preset temperature by adopting the first current in a constant current manner;
judging whether the charging electric quantity of the battery reaches 3% -5% or whether the charging cut-off voltage of the battery reaches 3.45-3.65V;
and if the charging electric quantity of the battery reaches 3% -5%, or the charging cut-off voltage of the battery reaches 3.45-3.65V, judging that the battery is charged to a second preset condition in a constant current mode.
In the formation method of the long-cycle soft package power battery, the second current is as follows: 0.20-0.40 ℃ C; the third current is: 0.10-0.30C;
the third preset condition is as follows: the charging time is 100-200 min; or the charge cut-off voltage is 3.45-3.65V, and the cut-off current is 0.02-0.10C;
the fourth preset condition is as follows: the charging time is 80-220 min; alternatively, the charge cut-off voltage is 3.45 to 3.65V, and the cut-off current is 0.02 to 0.10C.
In the formation method of the long-cycle soft package power battery, the charging the battery with the second current and the determining whether the charging state of the battery meets a third preset condition include:
carrying out constant-current and constant-voltage charging on the battery by adopting a current of 0.20-0.40C;
judging whether the charging time of the battery reaches 100-200 min or not, or whether the charging cut-off voltage of the battery reaches 3.45-3.65V or not and whether the charging cut-off current reaches 0.02-0.10C or not;
the charging the battery to a fourth preset condition with the third current comprises:
carrying out constant-current and constant-voltage charging on the battery by adopting a current of 0.10-0.30C;
judging whether the charging time of the battery reaches 80-220 min or not, or whether the charging cut-off voltage of the battery reaches 3.45-3.65V or not and whether the charging cut-off current reaches 0.02-0.10C or not;
and if the charging time of the battery reaches 80-220 min, or the charging cut-off voltage of the battery reaches 3.45-3.65V and the charging cut-off current reaches 0.02-0.10C, judging that the battery is charged to a fourth preset condition.
The invention also provides a long-circulation soft package power battery which is formed by adopting the forming method of the long-circulation soft package power battery.
The implementation of the forming method of the long-circulation soft package power battery and the long-circulation soft package power battery has the following beneficial effects: the method comprises the following steps: at a preset temperature, performing constant current charging on the battery by adopting a first current; judging whether the charging state of the battery meets a first preset condition or not; if the first preset condition is met, taking out the battery from the formation cabinet, and carrying out vacuum treatment; after the vacuum treatment is finished, the battery is placed in the formation cabinet again; and charging the battery to a second preset condition at a preset temperature by adopting the first current. The invention can effectively solve the problem of black spots generated in the formation process of the battery, has low requirements on environment and equipment, can effectively ensure the formation effect, can ensure the safety of the battery, can also improve the reliability of the battery, and prolongs the service life of the battery.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic flow chart of a first embodiment of a long-cycle soft package power battery formation method provided by the invention;
fig. 2 is a schematic flow chart of a long-cycle soft package power battery formation method according to a second embodiment of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Referring to fig. 1, a schematic flow chart of a first embodiment of a long-cycle soft package power battery formation method provided by the present invention is shown.
Specifically, as shown in fig. 1, the formation method of the long-cycle soft package power battery includes the following steps:
and S101, performing constant current charging on the battery by adopting a first current at a preset temperature.
Optionally, in the embodiment of the present invention, the preset temperature is 45 ± 5 ℃.
Step S102, judging whether the charging state of the battery meets a first preset condition.
Optionally, in an embodiment of the present invention, the first current includes: 0.05-0.10C. The first preset condition includes: the charging quantity of the battery is 7% -10%; or the charge cut-off voltage of the battery is 3.35-3.55V.
In some embodiments, determining whether the state of charge of the battery satisfies the first preset condition includes: judging whether the charge amount of the battery reaches 7% -10%; if so, judging that the charging state of the battery meets a first preset condition; or judging whether the charge cut-off voltage of the battery reaches 3.35-3.55V or not; and if the voltage reaches 3.35-3.55V, judging that the charging state of the battery meets the first preset condition.
Specifically, in the process of performing constant-current charging on the battery by using the first current, the charging time can be monitored in real time, the charging amount of the battery can be obtained by calculating according to the charging time and the first current, and whether the charging amount reaches the set charging amount (7% -10%) is judged according to the calculated charging amount. The calculation mode of the charge amount can be calculated by adopting the following formula:
charge amount is charge current charge time/60. Wherein the unit of the charging time is minutes (min).
And S103, if the first preset condition is met, taking out the battery from the formation cabinet, and performing vacuum treatment.
Optionally, in an embodiment of the present invention, the battery includes: cell main part and gasbag bag. Specifically, the battery core main body and the airbag are of an integrated structure, in the process of manufacturing the battery, a shell punching operation is required to be performed firstly, namely, a part of a flat aluminum-plastic film is punched into a pit, then a winding core is placed into the pit to form the battery core main body, the unfilled part is the airbag, the airbag is used for containing gas generated in the formation process, and after the formation is completed, the airbag is cut off.
In some embodiments, removing the battery from the formation cabinet and subjecting to vacuum comprises: taking out the battery from the formation cabinet; keeping the airbag upwards in the positive direction; vacuumizing the air bag; and after vacuumizing for a preset time period, stopping vacuumizing, and finishing the sealing treatment of the air bag.
Optionally, the preset period of vacuumizing can be set to be 10-20 s.
During vacuumizing, a needle tube connected with a vacuum buffer tank can be punctured into the air bag, the vacuumizing is carried out for 10-20 s under the condition that the vacuum degree is-60 Kpa to-100 Kpa, the needle tube is taken out after the gas in the air bag is exhausted, and the sealing is rapidly completed. Alternatively, the seal can be completed within 10 seconds.
In the embodiment of the invention, the conventional vacuumizing equipment is adopted, the air bag can be operated in a conventional open environment by vacuumizing the air bag through the needle tube, and no special requirement is imposed on the temperature and the humidity of the environment.
Optionally, in the embodiment of the present invention, when the airbag is sealed, a conventional soft sealing head is used. The soft seal end socket is adopted to seal the air bag, so that the inside of the battery cell can be kept airtight.
And step S104, after the vacuum treatment is finished, the battery is placed in the formation cabinet again.
And step S105, charging the battery to a second preset condition at a preset temperature by adopting the first current.
Optionally, in this embodiment of the present invention, the second preset condition includes: the charging quantity of the battery is 3% -5%; or the charge cut-off voltage of the battery is 3.45-3.65V.
In some embodiments, the constant current charging the battery to the second preset condition at the preset temperature by using the first current comprises: charging the battery at a preset temperature by adopting a first current in a constant current manner; judging whether the charging electric quantity of the battery reaches 3% -5% or whether the charging cut-off voltage of the battery reaches 3.45-3.65V; and if the charging electric quantity of the battery reaches 3% -5%, or the charging cut-off voltage of the battery reaches 3.45-3.65V, judging that the battery is charged to a second preset condition in a constant current mode.
In the embodiment of the invention, after the vacuum pumping is finished, the constant current charging is continuously carried out on the battery by adopting the small current of 0.05-0.10C, so that a dense SEI film can be formed in the area where the black spots are generated originally, the capacity of the area can be exerted, and the problem of the black spots caused by the existing formation method is effectively solved.
Referring to fig. 2, a schematic flow chart of a long-cycle pouch power battery formation method according to a second embodiment of the present invention is shown.
Specifically, as shown in fig. 2, on the basis of the first embodiment, after the step S105 is executed, the embodiment further includes the following steps:
and step S106, charging the battery by adopting the second current, and judging whether the charging state of the battery meets a third preset condition.
Optionally, before the battery is charged with the second current at constant current and constant voltage, the battery needs to be silenced for a preset time. The optional preset time can be 3-10 min.
And S107, if the third preset condition is met, adopting the third current to charge the battery to a fourth preset condition.
Optionally, after the battery meets the third preset condition, the battery is required to stand for 3-10 min, and then step S107 is executed.
Optionally, in this embodiment of the present invention, the second current is: 0.20-0.40 ℃ C; the third current is: 0.10-0.30 ℃.
The third preset condition is as follows: the charging time is 100-200 min; alternatively, the charge cut-off voltage is 3.45 to 3.65V, and the cut-off current is 0.02 to 0.10C.
The fourth preset condition is as follows: the charging time is 80-220 min; alternatively, the charge cut-off voltage is 3.45 to 3.65V, and the cut-off current is 0.02 to 0.10C.
In some embodiments, the charging the battery with the second current and determining whether the charging state of the battery satisfies the third preset condition includes: carrying out constant-current and constant-voltage charging on the battery by adopting a current of 0.20-0.40 ℃; and judging whether the charging time of the battery reaches 100-200 min or not, or whether the charging cut-off voltage of the battery reaches 3.45-3.65V or not and whether the charging cut-off current reaches 0.02-0.10C or not.
In some embodiments, charging the battery to the fourth predetermined condition with the third current includes: carrying out constant-current and constant-voltage charging on the battery by adopting a current of 0.10-0.30C; judging whether the charging time of the battery reaches 80-220 min or not, or whether the charging cut-off voltage of the battery reaches 3.45-3.65V or not and whether the charging cut-off current reaches 0.02-0.10C or not; and if the charging time of the battery reaches 80-220 min, or the charging cut-off voltage of the battery reaches 3.45-3.65V and the charging cut-off current reaches 0.02-0.10C, judging that the battery is charged to a fourth preset condition.
Optionally, the formation method of the long-cycle soft package power battery provided by the embodiment of the invention is applicable to a lithium ion battery, wherein the anode of the lithium ion battery is lithium iron phosphate, and the cathode of the lithium ion battery is a carbon cathode.
The method for forming the long-cycle soft package power battery disclosed by the embodiment of the invention can effectively improve the negative electrode interface of the soft package battery, form a compact and stable SEI film, completely remove gas generated by formation, and effectively improve the available capacity, cycle performance, consistency and safety of the battery. The scheme only adopts conventional vacuumizing equipment, gas in the air bag is removed through vacuumizing, expensive negative pressure formation equipment is not needed, the process is simple, the operation is easy, and the production cost is saved. And the formation interface can be ensured, the cycle life of the battery is prolonged, and the satisfaction degree of customers is improved.
The following description will be given by taking a lithium ion battery in which a positive electrode is lithium iron phosphate and a negative electrode is a carbon negative electrode as an example:
in the first step, the battery is charged for 60min at a constant current of 0.1C, and the cut-off voltage is 3.45V.
And step two, after the battery is taken out of the formation cabinet, keeping the air bag upwards, vacuumizing for 10s by using a needle tube connected with the vacuum cache tank, and sealing.
And thirdly, the battery subjected to the sealing is placed in a formation cabinet again, and the battery is charged for 20min at a constant current of 0.1C.
And fourthly, standing for 5 min.
And fifthly, charging for 130min at a constant current and a constant voltage of 0.3C, wherein the cut-off current is 0.05C, and the cut-off voltage is 3.65V.
And sixthly, standing for 5 min.
And seventhly, charging for 105min at a constant current of 0.2C with the cutoff current of 0.05C and the cutoff voltage of 3.65V.
And eighth, finishing formation.
The invention also provides a long-circulation soft package power battery which can be formed by adopting the forming method of the long-circulation soft package power battery disclosed by the embodiment of the invention.
Optionally, the long-cycle soft package power battery may be a lithium ion battery, wherein the positive electrode of the lithium ion battery is lithium iron phosphate, and the negative electrode of the lithium ion battery is a carbon negative electrode.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (11)
1. A long-circulation soft package power battery formation method is characterized by comprising the following steps:
at a preset temperature, performing constant current charging on the battery by adopting a first current;
judging whether the charging state of the battery meets a first preset condition or not;
if the first preset condition is met, taking the battery out of the formation cabinet, and carrying out vacuum treatment;
after the vacuum treatment is completed, the battery is placed in the formation cabinet again;
and charging the battery to a second preset condition at the preset temperature by adopting the first current in a constant current mode.
2. The long-cycle pouch power cell formation method according to claim 1, wherein after the constant-current charging of the battery at the preset temperature to a second preset condition with the first current further comprises:
charging the battery by adopting a second current, and judging whether the charging state of the battery meets a third preset condition or not;
and if the third preset condition is met, charging the battery to a fourth preset condition by adopting a third current.
3. The long-cycle pouch power cell formation method of claim 1, wherein the first current comprises: 0.05-0.10C; the first preset condition includes: the charging quantity of the battery is 7% -10%; or the charging cut-off voltage of the battery is 3.35-3.55V.
4. The long-cycle soft-package power battery formation method according to claim 3, wherein the judging whether the charge state of the battery meets a first preset condition comprises:
judging whether the charging amount of the battery reaches 7% -10%;
if so, judging that the charging state of the battery meets the first preset condition;
or judging whether the charge cut-off voltage of the battery reaches 3.35-3.55V or not;
and if the voltage reaches 3.35-3.55V, judging that the charging state of the battery meets the first preset condition.
5. The long-cycle pouch power cell formation method of claim 1, wherein the cell comprises: a cell body and an air pocket; the taking out of the battery from the formation cabinet and the vacuum treatment comprises the following steps:
taking the battery out of the formation cabinet;
keeping the airbag facing upwards;
vacuumizing the air bag by adopting a preset vacuum degree;
and after vacuumizing for a preset time period, stopping vacuumizing, and finishing the sealing treatment of the airbag.
6. The long-cycle soft-package power battery formation method according to claim 5, wherein the preset vacuum degree is: -60Kpa to-100 Kpa; the preset time period is as follows: 10 to 20 seconds.
7. The long-cycle pouch power cell formation method according to claim 1, wherein the second preset condition comprises: the charging amount of the battery is 3% -5%; or the charging cut-off voltage of the battery is 3.45-3.65V.
8. The long-cycle pouch power cell formation method according to claim 7, wherein the constant-current charging of the battery to a second preset condition at the preset temperature using the first current comprises:
charging the battery at the preset temperature by adopting the first current in a constant current manner;
judging whether the charging electric quantity of the battery reaches 3% -5% or whether the charging cut-off voltage of the battery reaches 3.45-3.65V;
and if the charging electric quantity of the battery reaches 3% -5%, or the charging cut-off voltage of the battery reaches 3.45-3.65V, judging that the battery is charged to a second preset condition in a constant current mode.
9. The long-cycle pouch power cell formation method of claim 2, wherein the second current is: 0.20-0.40 ℃ C; the third current is: 0.10-0.30C;
the third preset condition is as follows: the charging time is 100-200 min; or the charge cut-off voltage is 3.45-3.65V, and the cut-off current is 0.02-0.10C;
the fourth preset condition is as follows: the charging time is 80-220 min; alternatively, the charge cut-off voltage is 3.45 to 3.65V, and the cut-off current is 0.02 to 0.10C.
10. The long-cycle soft-package power battery formation method according to claim 8, wherein the charging the battery with the second current and determining whether the charging state of the battery meets a third preset condition includes:
carrying out constant-current and constant-voltage charging on the battery by adopting a current of 0.20-0.40C;
judging whether the charging time of the battery reaches 100-200 min or not, or whether the charging cut-off voltage of the battery reaches 3.45-3.65V or not and whether the charging cut-off current reaches 0.02-0.10C or not;
the charging the battery to a fourth preset condition with the third current comprises:
carrying out constant-current and constant-voltage charging on the battery by adopting a current of 0.10-0.30C;
judging whether the charging time of the battery reaches 80-220 min or not, or whether the charging cut-off voltage of the battery reaches 3.45-3.65V or not and whether the charging cut-off current reaches 0.02-0.10C or not;
and if the charging time of the battery reaches 80-220 min, or the charging cut-off voltage of the battery reaches 3.45-3.65V and the charging cut-off current reaches 0.02-0.10C, judging that the battery is charged to a fourth preset condition.
11. The long-cycle soft package power battery is characterized by being formed by the long-cycle soft package power battery formation method according to any one of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111553128.7A CN114388893A (en) | 2021-12-17 | 2021-12-17 | Long-circulation soft package power battery formation method and long-circulation soft package power battery |
Applications Claiming Priority (1)
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| CN101950815A (en) * | 2010-08-23 | 2011-01-19 | 八叶(厦门)新能源科技有限公司 | Method for forming cylindrical lithium-ion secondary battery |
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| CN109755680A (en) * | 2018-12-19 | 2019-05-14 | 龙能科技(宁夏)有限责任公司 | The chemical synthesizing method of soft package power lithium ion battery |
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