CN107516750A - A kind of method and device for determining lithium ion battery safe charging condition - Google Patents
A kind of method and device for determining lithium ion battery safe charging condition Download PDFInfo
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- CN107516750A CN107516750A CN201710657853.6A CN201710657853A CN107516750A CN 107516750 A CN107516750 A CN 107516750A CN 201710657853 A CN201710657853 A CN 201710657853A CN 107516750 A CN107516750 A CN 107516750A
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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
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention provides a kind of method and device for determining lithium ion battery safe charging condition, including：The step of three electrode lithium ion batteries are charged using preset charged multiplying power under preset temperature or unit；Determine that the three electrodes lithium ion battery does not occur to analyse lithium, i.e., the step of being charged as lithium ion battery safe charging condition using the preset charged multiplying power under the preset temperature or unit if the voltage difference between the negative pole and the reference electrode is more than zero.The present invention realizes the condition for determining lithium ion battery safe charging, so as to avoid the security that lithium ion battery causes analysis lithium to influence lithium ion battery because of irrational charge condition, reach the purpose of the service life and security performance that improve lithium ion battery, and there is simple, maneuverable advantage.
Description
Technical field
The present invention relates to technical field of lithium ion, and in particular to a kind of determination lithium ion battery safe charging condition
Method and device.
Background technology
Lithium ion battery has energy density is high, have extended cycle life, operating voltage is high, charging rate is fast, self discharge is small etc.
Significant advantage turns into most advantageous secondary cell, and current lithium ion battery is by extensive digital product, energy-accumulating power station, electronic vapour
The fields such as car.As the continuous expansion in lithium ion battery applications field, its application conditions are also further harsh.Especially electric automobile
Field, due to the requirement of use condition, the demand of quick charge be present, especially under low temperature during big multiplying power charging, electricity can be caused
The larger polarization in pond, and cause the analysis lithium of battery to occur, so as to cause greatly to endanger to the security performance of battery, so to carry
Before determine lithium ion battery safe charging condition, that is, determine the boundary condition of lithium ion battery analysis lithium.
In order to judge whether battery analyses lithium, in general way is that battery is entered after battery is charged under certain condition
Row is disassembled, and judges whether lithium ion battery analyses lithium, and passes through a series of experiment, determines the perimeter strip of lithium ion battery analysis lithium
Part.Such as Publication No. CN106168652A patent application is mentioned in order to judge whether battery analyses lithium, by disassembling battery, mesh
Judge whether negative terminal surface analyses lithium depending on observation.On the one hand for lithium ion battery, especially automobile-used lithium ion battery, battery volume
Larger with capacity, some batteries or box hat battery, disassembling battery needs labor intensive and material resources, and for a small amount of analysis lithium
It can not accomplish that visually observation judges, propose analysis lithium whether occur using power spectrum, XRD analysis means observation negative terminal surface for this, but
It is due to disassemble to recycle after battery instrument to carry out testing negative terminal surface to be seen and can expose a period of time in atmosphere, due to
The lithium metal of precipitation is very active, the products such as generation lithium carbonate has often been reacted before being tested, and can bring sentencing for mistake
It is disconnected.Coulombic efficiency when being circulated by comparative cell is mentioned in Publication No. CN106093777A patent application
It is no analysis lithium occur, on the one hand, the analysis lithium of battery can cause the change of coulombic efficiency, but the change of coulombic efficiency is but not necessarily
There is analysis lithium；On the other hand, the method process is cumbersome, in order to obtain the rule of battery coulombic efficiency, it is necessary to carry out more weeks
Circulation.Therefore the analysis lithium of lithium ion battery is judged exactly and determines that lithium ion battery safe charging condition is current urgent need to resolve
Technical problem.
The content of the invention
For in the prior art the defects of, the present invention provide it is a kind of determine lithium ion battery safe charging condition method and
Device, the condition for determining lithium ion battery safe charging is realized, improve safety of the lithium ion battery in the case of quick charge
Property.
To achieve the above object, the present invention provides following technical scheme：
On the one hand, the invention provides a kind of method for determining lithium ion battery safe charging condition, including：
Three electrode lithium ion batteries are charged using preset charged multiplying power under preset temperature；Wherein, three electricity
The electrode of pole lithium ion battery is respectively：Positive pole, negative pole and reference electrode；
If the voltage difference between the negative pole and the reference electrode is more than zero, it is determined that the three electrodes lithium ion battery
Do not occur to analyse lithium, i.e., safe charging bar is charged as to lithium ion battery using the preset charged multiplying power under the preset temperature
Part.
Alternatively, the step that three electrode lithium ion batteries are charged using preset charged multiplying power under preset temperature
Suddenly, also include before：
Reference electrode is placed on the outside of the naked battery core of lithium ion battery three electrode lithium ion batteries are made.
Alternatively, positive/negative plate of the reference electrode parallel or perpendicular to lithium ion battery.
Alternatively, the material of the reference electrode is：Lithium metal or lithium alloy；The lithium alloy includes：Lithium-tin alloy, lithium
Copper alloy or lithium-aluminium alloy.
Alternatively, the reference electrode is shaped as：One-dimensional rod-like or two-dimensional sheet.
Alternatively, the scope of the preset temperature is：- 40 DEG C~55 DEG C.
Alternatively, the scope of the preset charged multiplying power is：0.1C~10C.
Alternatively, the equipment to be charged to three electrode lithium ion batteries is：Battery charging and discharging tester or electrochemistry work
Stand；The equipment for measuring the voltage between the negative pole and reference electrode of three electrode lithium ion batteries is：Electrochemical workstation, universal meter
Or voltmeter.
On the other hand, the invention provides a kind of device for determining lithium ion battery safe charging condition, including：
Charhing unit, for being charged under preset temperature using preset charged multiplying power to three electrode lithium ion batteries；
Wherein, the electrode of the three electrodes lithium ion battery is respectively：Positive pole, negative pole and reference electrode；
Judging unit, if being more than zero for the voltage difference between the negative pole and the reference electrode, it is determined that described three
Electrode lithium ion battery does not occur to analyse lithium, i.e., lithium ion battery is filled using the preset charged multiplying power under the preset temperature
Electricity is safe charging condition.
Alternatively, described device also includes：
Preparation unit, three electrode lithium-ion electrics are made for reference electrode to be placed on the outside of the naked battery core of lithium ion battery
Pond.
As shown from the above technical solution, it is of the present invention it is a kind of determine lithium ion battery safe charging condition method and
Device, the condition for determining lithium ion battery safe charging is realized, so as to avoid lithium ion battery from being led because of irrational charge condition
Cause analysis lithium to influence the security of lithium ion battery, reach the purpose of the service life and security performance that improve lithium ion battery, and
And there is simple, maneuverable advantage.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 is a kind of schematic flow sheet of the method for determination lithium ion battery safe charging condition of the present invention；
Fig. 2 is the schematic flow sheet of another method for determining lithium ion battery safe charging condition of the present invention；
Fig. 3 is the change of the current potential between negative pole and reference electrode when being charged at -10 DEG C with 0.5C to lithium ion battery
Curve map；
Fig. 4 is a kind of structural representation of the device of determination lithium ion battery safe charging condition of the present invention.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, clear, complete description is carried out to the technical scheme in the embodiment of the present invention, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
The embodiment of the present invention provides a kind of method for determining lithium ion battery safe charging condition, referring to Fig. 1, this method tool
Body comprises the following steps：
S101：Three electrode lithium ion batteries are charged using preset charged multiplying power under preset temperature；Wherein, it is described
The electrode of three electrode lithium ion batteries is respectively：Positive pole, negative pole and reference electrode；
In this step, the multiplier value of the temperature value of preset temperature and preset charged multiplying power is respectively in the scope of two set
Within, the preset temperature and the preset charged multiplying power are belonging respectively to one group of data in this two set；At different temperature
After carrying out charging process to three electrode lithium ion batteries using different rate of charge, the three electrodes lithium ion battery is examined
Survey.
Further, the scope of the preset temperature is：- 40 DEG C~55 DEG C.The scope of the preset charged multiplying power is：
0.1C~10C.
S102：If voltage difference between the negative pole and the reference electrode is more than zero, it is determined that the three electrodes lithium from
Sub- battery does not occur to analyse lithium, i.e., is charged as safety to lithium ion battery using the preset charged multiplying power under the preset temperature
Charge condition.
In this step, after by above-mentioned steps S101, the voltage difference between negative pole and reference electrode is detected, is passed through
Voltage difference judges whether three electrode lithium ion batteries send analysis lithium；Wherein, if the voltage difference between negative pole and reference electrode is big
In zero, then judge that three electrode lithium ion batteries do not occur to analyse lithium, conversely, then judging that analysis lithium occurs for three electrode lithium ion batteries.
Analysis lithium does not occur and then shows at current temperature for three electrode lithium ion batteries, with current rate of charge to three electricity
Pole lithium ion battery charging belongs to safe charging condition；Conversely, analysis lithium occurs, then with current charging times at current temperature
Rate carries out charging and belongs to non-security charge condition.
Due in above-mentioned steps S101, being carried out at different temperatures using different rate of charge to three electrode lithium ion batteries
Charging, judge whether that analysis lithium occurs in the mode in step S102, then analysis lithium can occur with three electrode lithium ion batteries
Boundary condition, that is, the boundary temperature and border rate of charge of analysis lithium occurs.Boundary condition according to analysis lithium occurs therefore can be true
Determine the safe charging condition that lithium ion battery is charged.
It was found from foregoing description, the present embodiment analyses lithium detection by being carried out to lithium ion battery, you can passes through lithium-ion electric
Whether pond analyses lithium, characterizes the safe charging condition of lithium ion battery, realizes the condition for determining lithium ion battery safe charging, so as to
Lithium ion battery is avoided to reach raising lithium ion because irrational charge condition causes analysis lithium to influence the security of lithium ion battery
The service life of battery and the purpose of security performance and identification and the prevention ability for improving lithium ion battery charging security,
Perfect leak and potential safety hazard existing for existing conventional detection means, great charging security risk can be avoided to occur, solution
The basic reason of certainly most of charging security incidents.
The embodiment of the present invention provides a kind of method for determining lithium ion battery safe charging condition, referring to Fig. 2, in above-mentioned side
On the basis of method embodiment, also comprise the following steps：
S100：Reference electrode is placed on the outside of the naked battery core of lithium ion battery three electrode lithium ion batteries are made.
In this step, three electricity that there is identical positive/negative plate with the lithium ion battery of safe charging condition to be confirmed are prepared
Pole lithium ion battery, reference electrode is specifically placed in the battery outermost layer of pole piece parallel direction or vertical direction.
Further, the material of the reference electrode is：Lithium metal or lithium alloy；The lithium alloy includes：Lithium-tin alloy,
Lithium-copper alloy or lithium-aluminium alloy.The reference electrode is shaped as：One-dimensional rod-like or two-dimensional sheet.
It was found from foregoing description, the present embodiment adds reference electrode on the basis of lithium ion battery, by measuring reference
Voltage difference between electrode and negative pole judges whether lithium ion battery occurs to analyse lithium, with being sentenced by the voltage of independent measurement negative pole
It is more accurate whether disconnected lithium ion battery occurs to analyse lithium, and is not influenceed by the structure of lithium ion battery and improves and judge whether
The accuracy of analysis lithium occurs.
Further, on the basis of above method embodiment, the equipment to be charged to three electrode lithium ion batteries is：
Battery charging and discharging tester or electrochemical workstation；Measure the voltage between the negative pole and reference electrode of three electrode lithium ion batteries
Equipment is：Electrochemical workstation, universal meter or voltmeter.
By foregoing description, the embodiments of the invention provide the method for determining lithium ion battery safe charging condition,
This method is simple, easily operation, can carry out safe charging condition test to various types of lithium ion batteries, judge lithium ion
The boundary condition of cell safety charging, so as to avoid battery from causing to analyse lithium safety behavior due to the charging behavior of irrational temperature
Occur.
It is described in detail for the method to the present invention more further, this law is bright to provide a kind of determination lithium ion battery peace
The concrete application example of the method for full charge condition, particular content are as follows：
The principle of this programme is：Security risk in lithium ion battery charging is that analysis lithium behavior occurs for negative pole in charging,
By introducing reference electrode, the comparative electrode current potential between negative pole and reference electrode is quantitatively detected, electricity during analysis lithium occurs for negative pole
The current potential that Lithium-ion embeding occurs for position and negative pole has obvious difference, when analysis lithium occurs, PNegative pole-PReference≤ 0V, come accordingly, by not
With the experiment of condition, to determine the boundary condition of lithium ion battery safe charging, so as to avoid lithium ion battery due to unreasonable
Charging behavior cause analyse lithium security incident generation.
Referring to Fig. 3, at a temperature of showing -10 DEG C, the change curve of negative electrode current potential when being charged with 0.5C to battery, from
It may determine that in Fig. 3, at a temperature of -10 DEG C, 45%SOC charged to 0.5C and (State of Charge, state-of-charge, also cried surplus
Remaining electricity) when negative pole current potential be down to below 0V, there occurs analysis lithium, so as to judge, at a temperature of -10 DEG C, 0.5C charging side
Boundary is below 45%SOC.
Embodiment 1：
Determine that the method for lithium-ion safe charge condition is achieved by the following steps：
1) three-electrode battery is prepared.Three-electrode battery is consistent with flexible packing lithium ion battery structure to be confirmed, has phase
Same both positive and negative polarity, reference electrode selection two-dimensional metallic lithium piece, reference electrode are placed in the battery outermost layer of pole piece parallel direction；
2) three-electrode battery is tested, at different temperatures, battery is charged with different charge conditions, sentenced
Whether lithium is analysed in power-off pond.Battery is charged with electrochemical workstation, and records the voltage between negative pole and reference electrode simultaneously.
Under the conditions of -40 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 5C, 10C respectively and recorded negative
Voltage between pole and reference electrode；
Under the conditions of -30 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 5C, 10C respectively and recorded negative
Voltage between pole and reference electrode；
Under the conditions of -20 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 5C, 10C respectively and recorded negative
Voltage between pole and reference electrode；
Under the conditions of -10 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 5C, 10C respectively and recorded negative
Voltage between pole and reference electrode；
Under the conditions of 0 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 5C, 10C respectively and records negative pole
Voltage between reference electrode；
Under the conditions of 10 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 5C, 10C respectively and recorded negative
Voltage between pole and reference electrode；
Under the conditions of 20 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 5C, 10C respectively and recorded negative
Voltage between pole and reference electrode；
Under the conditions of 55 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 5C, 10C respectively and recorded negative
Voltage between pole and reference electrode；
3) whether occurred to analyse the judgement of lithium as battery according to the voltage between negative pole and reference electrode, so that it is determined that lithium ion
The condition of cell safety charging.According to the result of step 2), the safe charging condition of flexible packing lithium ion battery, such as following table are drawn
It is shown.
Embodiment 2：
Determine that the method for lithium-ion safe charge condition is achieved by the following steps：
1) three-electrode battery is prepared.Three-electrode battery is consistent with square lithium ion battery structure to be confirmed, has identical
Both positive and negative polarity, reference electrode selects one-dimensional lithium-tin alloy line, and reference electrode is placed in the battery outermost layer of pole piece parallel direction.
2) three-electrode battery is tested, at different temperatures, battery is charged with different charge conditions, sentenced
Whether lithium is analysed in power-off pond.Battery is charged with charge-discharge test instrument, and marks record negative pole and reference electrode with voltage simultaneously
Between voltage.
Under the conditions of -30 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 5C, 10C respectively and recorded negative
Voltage between pole and reference electrode；
Under the conditions of -20 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 5C, 10C respectively and recorded negative
Voltage between pole and reference electrode；
Under the conditions of -10 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 5C, 10C respectively and recorded negative
Voltage between pole and reference electrode；
Under the conditions of 0 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 5C, 10C respectively and records negative pole
Voltage between reference electrode；
Under the conditions of 10 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 5C, 10C respectively and recorded negative
Voltage between pole and reference electrode；
Under the conditions of 20 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 5C, 10C respectively and recorded negative
Voltage between pole and reference electrode；
Under the conditions of 55 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 5C, 10C respectively and recorded negative
Voltage between pole and reference electrode；
3) whether occurred to analyse the judgement of lithium as battery according to the voltage between negative pole and reference electrode, so that it is determined that lithium ion
The condition of cell safety charging.According to the result of step 2), the safe charging condition of rectangular lithium ion battery is drawn, such as following table institute
Show.
Embodiment 3：
Determine that the method for lithium-ion safe charge condition is achieved by the following steps：
1) three-electrode battery is prepared.Three-electrode battery is consistent with flexible packing lithium ion battery structure to be confirmed, has phase
Same both positive and negative polarity, reference electrode select one-dimensional lithium-copper alloy rod, and reference electrode is placed in the battery outermost layer of pole piece vertical direction.
2) three-electrode battery is tested, at different temperatures, battery is charged with different charge conditions, sentenced
Whether lithium is analysed in power-off pond.Battery is charged with charge-discharge test instrument, and records negative pole and reference electrode with universal meter simultaneously
Between voltage.
Under the conditions of -40 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 5C respectively and record negative pole with
Voltage between reference electrode；
Under the conditions of -30 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 5C respectively and record negative pole with
Voltage between reference electrode；
Under the conditions of -20 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 5C respectively and record negative pole with
Voltage between reference electrode；
Under the conditions of -10 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 5C respectively and record negative pole with
Voltage between reference electrode；
Under the conditions of 0 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 5C respectively and records negative pole with joining
Than interelectrode voltage；
Under the conditions of 10 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 5C respectively and record negative pole with
Voltage between reference electrode；
Under the conditions of 20 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 5C respectively and record negative pole with
Voltage between reference electrode；
Under the conditions of 55 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 5C respectively and record negative pole with
Voltage between reference electrode；
3) whether occurred to analyse the judgement of lithium as battery according to the voltage between negative pole and reference electrode, so that it is determined that lithium ion
The condition of cell safety charging.According to the result of step 2), the safe charging condition of flexible packing lithium ion battery, such as following table are drawn
It is shown.
Embodiment 4：
Determine that the method for lithium-ion safe charge condition is achieved by the following steps：
1) three-electrode battery is prepared.Three-electrode battery is consistent with cylindrical lithium ion battery structure to be confirmed, has identical
Both positive and negative polarity, reference electrode selects one-dimensional lithium-copper alloy piece, and reference electrode is placed in the battery outermost layer of pole piece parallel direction.
2) three-electrode battery is tested, at different temperatures, battery is charged with different charge conditions, sentenced
Whether lithium is analysed in power-off pond.Battery is charged with electrochemical workstation, and records the voltage between negative pole and reference electrode simultaneously.
Under the conditions of -30 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 3C respectively and record negative pole with
Voltage between reference electrode；
Under the conditions of -20 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 3C respectively and record negative pole with
Voltage between reference electrode；
Under the conditions of -10 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 3C respectively and record negative pole with
Voltage between reference electrode；
Under the conditions of 0 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 3C respectively and records negative pole with joining
Than interelectrode voltage；
Under the conditions of 10 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 3C respectively and record negative pole with
Voltage between reference electrode；
Under the conditions of 20 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 3C respectively and record negative pole with
Voltage between reference electrode；
Under the conditions of 55 DEG C, battery is charged with 0.1C, 0.2C, 0.5C, 1C, 2C, 3C respectively and record negative pole with
Voltage between reference electrode；
3) whether occurred to analyse the judgement of lithium as battery according to the voltage between negative pole and reference electrode, so that it is determined that lithium ion
The condition of cell safety charging.According to the result of step 2), the safe charging condition of cylindrical lithium ion battery is drawn, such as following table institute
Show.
It was found from foregoing description, lithium is analysed by the negative pole of the lithium ion battery to being charged under certain temperature and accurately examined
Survey, avoid determining the condition of lithium ion battery safe charging because negative pole analysis lithium influences the security of lithium ion battery during charging,
Reach the purpose of the service life and security performance that improve lithium ion battery.
The embodiment of the present invention provides a kind of device for determining lithium ion battery safe charging condition, referring to Fig. 4, device tool
Body includes：
Charhing unit 20, for being filled under preset temperature using preset charged multiplying power to three electrode lithium ion batteries
Electricity；Wherein, the electrode of the three electrodes lithium ion battery is respectively：Positive pole, negative pole and reference electrode；
Judging unit 30, if being more than zero for the voltage difference between the negative pole and the reference electrode, it is determined that described
Three electrode lithium ion batteries do not occur to analyse lithium, i.e., using the preset charged multiplying power to lithium ion battery under the preset temperature
It is charged as safe charging condition.
Further, described device also includes：
Preparation unit 10, three electrode lithium ions are made for reference electrode to be placed on the outside of the naked battery core of lithium ion battery
Battery.
By foregoing description,
A kind of device for determining lithium ion battery safe charging condition of the present invention, realizes and determines lithium ion battery peace
Completely charged condition, so as to avoid the safety that lithium ion battery causes analysis lithium to influence lithium ion battery because of irrational charge condition
Property, reach the purpose of the service life and security performance that improve lithium ion battery, and there is simple, maneuverable advantage.
Above example is merely to illustrate technical scheme, rather than its limitations；Although with reference to the foregoing embodiments
The present invention is described in detail, it will be understood by those within the art that：It still can be to foregoing each implementation
Technical scheme described in example is modified, or carries out equivalent substitution to which part technical characteristic；And these are changed or replaced
Change, the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
- A kind of 1. method for determining lithium ion battery safe charging condition, it is characterised in that methods described includes：Three electrode lithium ion batteries are charged using preset charged multiplying power under preset temperature；Wherein, the three electrodes lithium The electrode of ion battery is respectively：Positive pole, negative pole and reference electrode；If the voltage difference between the negative pole and the reference electrode is more than zero, it is determined that the three electrodes lithium ion battery is not sent out Raw analysis lithium, i.e., be charged as safe charging condition to lithium ion battery under the preset temperature using the preset charged multiplying power.
- 2. according to the method for claim 1, it is characterised in that described that preset charged multiplying power is used under preset temperature to three The step of electrode lithium ion battery is charged, also includes before：Reference electrode is placed on the outside of the naked battery core of lithium ion battery three electrode lithium ion batteries are made.
- 3. according to the method for claim 2, it is characterised in that the reference electrode is parallel or perpendicular to lithium ion battery Positive/negative plate.
- 4. according to the method for claim 2, it is characterised in that the material of the reference electrode is：Lithium metal or lithium alloy； The lithium alloy includes：Lithium-tin alloy, lithium-copper alloy or lithium-aluminium alloy.
- 5. according to the method for claim 4, it is characterised in that the reference electrode is shaped as：One-dimensional rod-like or two dimension Sheet.
- 6. according to the method for claim 1, it is characterised in that the scope of the preset temperature is：- 40 DEG C~55 DEG C.
- 7. according to the method for claim 1, it is characterised in that the scope of the preset charged multiplying power is：0.1C~10C.
- 8. according to the method for claim 1, it is characterised in that the equipment to be charged to three electrode lithium ion batteries is： Battery charging and discharging tester or electrochemical workstation；Measure the voltage between the negative pole and reference electrode of three electrode lithium ion batteries Equipment is：Electrochemical workstation, universal meter or voltmeter.
- 9. a kind of device for determining lithium ion battery safe charging condition, it is characterised in that described device includes：Charhing unit, for being charged under preset temperature using preset charged multiplying power to three electrode lithium ion batteries；Wherein, The electrode of the three electrodes lithium ion battery is respectively：Positive pole, negative pole and reference electrode；Judging unit, if being more than zero for the voltage difference between the negative pole and the reference electrode, it is determined that three electrode Lithium ion battery does not occur to analyse lithium, i.e., lithium ion battery is charged as using the preset charged multiplying power under the preset temperature Safe charging condition.
- 10. device according to claim 9, it is characterised in that described device also includes：Preparation unit, three electrode lithium ion batteries are made for reference electrode to be placed on the outside of the naked battery core of lithium ion battery.
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