CN108226803A - A kind of battery testing method and system for becoming extruding force - Google Patents
A kind of battery testing method and system for becoming extruding force Download PDFInfo
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- CN108226803A CN108226803A CN201810034504.3A CN201810034504A CN108226803A CN 108226803 A CN108226803 A CN 108226803A CN 201810034504 A CN201810034504 A CN 201810034504A CN 108226803 A CN108226803 A CN 108226803A
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- battery
- internal resistance
- extruding force
- time period
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- Tests Of Electric Status Of Batteries (AREA)
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Abstract
The embodiment of the present invention provides a kind of battery testing method and system for becoming extruding force.Two batteries first apply identical extruding force respectively, and the extruding force is kept first time period.The first battery is charged to simultaneously and is full of, by the second battery discharge to discharging, and after second time period is stood, records the first charge capacity of the first battery and ohmic internal resistance, the polarization resistance of two batteries.Then the extruding force is discharged, and two batteries are stood into second time period again.After standing, by the first battery discharge to discharging, the second battery is charged to and is full of, and by two battery standing second time periods and record the second battery the second charging capacity.Change extruding force, continue above-mentioned steps.Test result is obtained according to charging capacity, ohmic internal resistance and the polarization resistance of first battery of the record under different extruding forces and the second battery.As a result, battery is carried out becoming the test of extruding force tolerance rather than the situation that only failed by charge and discharge number to battery capacity is tested.
Description
Technical field
The present invention relates to battery technology field, in particular to a kind of battery testing method and system for becoming extruding force.
Background technology
It is increasingly severe for the pollution of environment with the continuous development of science and technology.Wherein, vehicle exhaust is the main of pollution
Source.And the exhaust emissions amount of pure electric automobile is less even without therefore the research and development of pure electric automobile increasingly attract attention.
The power of pure electric automobile is battery.For current battery after finished product is manufactured, general evaluation method is by being melted into charge and discharge
Electric number screens battery parameter, so as to judge whether finished battery meets manufacture specification requirement.With pure electric automobile
Large-scale popularization and application, battery charging safety problem it is more and more important, it is impossible to only by charge and discharge number realize to battery
Test.
Invention content
In order to overcome above-mentioned deficiency of the prior art, the technical problems to be solved by the invention are to provide a kind of become and squeeze
The battery testing method and system of power, can be under charge status, by applying different extruding force completions pair to battery
The test of battery, and obtain test result.
The embodiment of the present invention provides a kind of battery testing method for becoming extruding force, the method includes：
After the first battery discharge terminates and the second battery charges, first battery and the second battery are applied respectively
Add extruding force, and keep the extruding force first time period, while first battery is charged to and is full of, by second battery
It is discharged to and discharges；
In the first time period, second battery standing that will be filled with first battery of electricity and be discharged
After two periods, the first charge capacity, the first ohmic internal resistance and the first polarization resistance and the second electricity of first battery are recorded
Second ohmic internal resistance and the second polarization resistance in pond, wherein, the second time period is less than the first time period；
Release is applied to extruding force on first battery and the second battery, and by first battery and the second battery
Stand the second time period；
After the second time period is stood, by first battery discharge to discharging, and described in standing after being discharged
Second battery is charged to and is full of by second time period, and is stood described in the second time period and record after fully charged
Second charging capacity of the second battery；
Change the extruding force, repeat above step, filled according to first of first battery under different extruding forces
Second charge capacity of power consumption, the first ohmic internal resistance and the first polarization resistance and the second battery, the second ohmic internal resistance and second
Polarization resistance obtains test result.
In embodiments of the present invention, described after the first battery discharge terminates and the second battery charges, to described
First battery and the second battery apply extruding force respectively, and keep the extruding force first time period, while by first battery
It charges to and is full of, by second battery discharge to before the step of discharging, the method further includes：
First battery and the second battery are pre-processed；
Described the step of being pre-processed to first battery and the second battery, includes：
It is before extruding force is not applied, first battery progress standard charge and discharge are primary, and record first battery
The first charging capacity；
After first battery discharge, by second time period described in first battery standing；
By second battery discharge to discharging, and stand the second time period.
In embodiments of the present invention, the method further includes：
Judged according to the second charge volume of the first charge capacity of first battery of different extruding forces and the second battery
Inside battery whether there is lithium ion dendrite.
In embodiments of the present invention, the method further includes：
Respectively is obtained according to the first ohmic internal resistance of first battery under different extruding forces and the first polarization resistance
One ohmic internal resistance curve and the first polarization resistance curve；
Respectively is obtained according to the second ohmic internal resistance of second battery under different extruding forces and the second polarization resistance
Two ohmic internal resistance curves and the second polarization resistance curve；
The first ohmic internal resistance curve and the second ohmic internal resistance curve are analyzed, to first polarization resistance song
Line and the second polarization resistance curve are analyzed, and judge the state of battery pole piece.
In embodiments of the present invention, the method further includes：
According to the system states filter battery of battery pole piece.
In embodiments of the present invention, the mode packet for applying extruding force respectively to first battery and the second battery
It includes：
Horizontal type extruding is carried out to first battery and the second battery respectively.
The embodiment of the present invention also provides a kind of battery test system for becoming extruding force, applied to the method, the system
System includes control unit, squeeze unit, measuring unit and the charge/discharge unit of electric connection, wherein, first battery and the
Two batteries are arranged on a testboard,
The squeeze unit is kept at the first time for applying extruding force respectively to first battery and the second battery
Section；
The measuring unit is used to measure the first charge capacity of first battery, the first ohmic internal resistance and the first polarization
Second charge capacity of internal resistance and second battery, the second ohmic internal resistance and the second polarization resistance；
The charge/discharge unit is used to carry out charge and discharge to first battery and the second battery；
Described control unit is used to control the working condition and root of the squeeze unit, measuring unit and charge/discharge unit
According to the first charge capacity, the first ohmic internal resistance and the first polarization resistance and second of first battery under different extruding forces
The second charge capacity, the second ohmic internal resistance and the second polarization resistance of battery obtain test result.
In embodiments of the present invention, described control unit is additionally operable to according to first battery under different extruding forces
Second charge capacity of the first charge capacity, the first ohmic internal resistance and the first polarization resistance and the second battery, the second ohmic internal resistance
And second polarization resistance carry out battery screening.
In embodiments of the present invention, the system also includes connector, the quantity of the connector and the quantity of battery
Match,
The positive or negative pole of described connector one end and battery is electrically connected, and the other end electrically connects with the measuring unit
It connects, the measuring unit measures charge capacity, ohmic internal resistance and the polarization resistance of battery by the connector.
In embodiments of the present invention, the contact being electrically connected with the measuring unit, institute are provided on the testboard
The positive or negative pole that contact is stated with fixed battery contacts, so that the measuring unit measures the charge capacity of battery, Europe
Nurse internal resistance and polarization resistance.
In terms of existing technologies, the invention has the advantages that：
The embodiment of the present invention provides a kind of battery testing method and system for becoming extruding force.Terminate in the first battery discharge and
In the case that the charging of second battery terminates, identical extruding force is applied respectively to first battery and the second battery first, and
The extruding force is kept into first time period.In the case where applying extruding force, first battery is charged to and is full of, and is being filled
The second time period is stood after full, wherein, the second time period is less than the first time period；Simultaneously by the described second electricity
Tank discharge is to discharging, and the second time period is stood after discharging.After standing, the first charging of first battery is recorded
Electricity, the first ohmic internal resistance and the first polarization resistance；Record the second ohmic internal resistance and the second polarization resistance of second battery.
Then the extruding force is discharged, and first battery and the second battery are stood into the second time period again.Terminate in standing
Afterwards, by first battery discharge to discharging, and stand the second time period；Second battery is charged to and is full of, and
It stands the second time period and records the second charging capacity of second battery.Change extruding force, continue above-mentioned steps.
It is obtained according to charging capacity, ohmic internal resistance and the polarization resistance of first battery of the record under different extruding forces and the second battery
Test result.As a result, battery is carried out becoming the test of extruding force tolerance rather than only be declined by charge and discharge number to battery capacity
The situation of moving back is tested.New battery can not only be tested by the above method, can also by test to used batteries into
Row screening.
For the above-mentioned purpose of invention, feature and advantage is enable to be clearer and more comprehensible, present pre-ferred embodiments cited below particularly, and
Attached drawing appended by cooperation, is described in detail below.
Description of the drawings
It in order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range, for those of ordinary skill in the art, without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is one of flow diagram of battery testing method provided in an embodiment of the present invention for becoming extruding force.
Fig. 2 is charging current, cell voltage and the relational graph of time of battery.
Fig. 3 is the two of the flow diagram of the battery testing method provided in an embodiment of the present invention for becoming extruding force.
Fig. 4 is the flow diagram of the sub-step that step S110 includes in Fig. 3.
Fig. 5 is the three of the flow diagram of the battery testing method provided in an embodiment of the present invention for becoming extruding force.
Fig. 6 is the block diagram of the battery test system provided in an embodiment of the present invention for becoming extruding force.
Icon：100- battery test systems；110- control units；120- squeeze units；130- measuring units；140- charge and discharges
Electric unit.
Specific embodiment
Below in conjunction with attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Ground describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.Usually exist
The component of the embodiment of the present invention described and illustrated in attached drawing can be configured to arrange and design with a variety of different herein.Cause
This, the detailed description of the embodiment of the present invention to providing in the accompanying drawings is not intended to limit claimed invention below
Range, but it is merely representative of the selected embodiment of the present invention.Based on the embodiment of the present invention, those skilled in the art are not doing
Go out all other embodiments obtained under the premise of creative work, shall fall within the protection scope of the present invention.
It should be noted that：Similar label and letter represents similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need to that it is further defined and explained in subsequent attached drawing.Meanwhile the present invention's
In description, term " first ", " second " etc. are only used for distinguishing description, and it is not intended that instruction or hint relative importance.
Below in conjunction with the accompanying drawings, it elaborates to some embodiments of the present invention.In the absence of conflict, it is following
Feature in embodiment and embodiment can be combined with each other.
Please refer to Fig. 1, Fig. 1 be the battery testing method provided in an embodiment of the present invention for becoming extruding force flow diagram it
One.Internal resistance and polarized state can all change battery in a compressed state.In the present embodiment, to the electricity under different extruding forces
The ohmic internal resistance and polarization resistance in pond are recorded, and the data of record are analyzed to obtain test result.Below to the change
The battery testing method of extruding force is described in detail.
In the present embodiment, when first battery and the second battery are lithium battery, battery is in charging process, lithium
Ion is deviate from from anode and is embedded in cathode, and cathode expansion, anode volume is caused to be reduced；Battery in discharge process, lithium ion from
Cathode is deviate from and is embedded in anode, and positive electrode expansion, negative electrode volume is caused to reduce.Using the volume change of anode and cathode,
The extruding force of different charging and discharging moment cooperation outside batteries carries out battery testing.
In the present embodiment, battery testing is carried out using the first battery and the second battery.Wherein, first battery and
Two batteries can be different battery, for example, the first battery is as normal cell, using the measurement data of the first battery as mark
Standard analyzes the measurement data of the second battery, obtains the test result of the second battery.
Step S120, after the first battery discharge terminates and the second battery charges, to first battery and second
Battery applies extruding force respectively, and keeps the extruding force first time period, while first battery is charged to and is full of, by institute
The second battery discharge is stated to discharging.
In the present embodiment, after first battery discharge, extruding force is applied, and applying to first battery
First battery is charged in the case of adding extruding force and is full of.Meanwhile after second battery charges, to described
Second battery applies same extruding force, and be discharged to discharging by second battery in the case where applying extruding force.
Wherein, after extruding force is applied, which is kept into first time period.
In the embodiment of the present embodiment, the mode for applying extruding force respectively to first battery and the second battery can
It to be, but is not limited to, horizontal type extruding is carried out to first battery and the second battery respectively.
Wherein, when extruding force is maximum extrusion pressure, it is impossible to inside battery structure be made to cave in and short trouble.It is in
The battery of squeezed state and the anode being not in the battery of squeezed state and interface and cathode and the contact condition at interface
It is different.Inside battery is typically winding, stacking or zigzag shape, after power is squeezed, the pressured state of each pole piece of inside battery
Relatively uniform, the internal resistance of battery and polarized state can change.
Wherein, interface is SEI (Solidelectrolyteinterface, solid electrolyte interface (film)) film, SEI films
It is the passivation film with solid electrolyte property.SEI is the excellence conductor of lithium ion, lithium ion can be allowed to be passed wherein
It is defeated, graphite surface is entered, carries out removal lithium embedded work.It is again simultaneously good electronic body, inside can be effectively reduced
Short-circuit probability.SEI films can effectively imitate the common insertion for preventing solvent molecule, avoid because solvent molecule is embedded in electrode material altogether
Destruction caused by material, thus substantially increase the cycle performance and service life of electrode
Step S130 in the first time period, will be filled with first battery of electricity and described second be discharged
After battery standing second time period, record in the first charge capacity, the first ohmic internal resistance and the first polarization of first battery
Resistance and the second ohmic internal resistance and the second polarization resistance of the second battery.
In the present embodiment, in the case where applying above-mentioned extruding force, it will be filled with first battery standing second of electricity
Second battery being discharged equally is stood the second time period by the period.After the second time period is stood, note
Record the first charging capacity, the first ohmic internal resistance and the first polarization resistance of first battery and the second Europe of second battery
Nurse internal resistance and the second polarization resistance.Wherein, the second time period is less than the first time period.The first time period and
Two periods can be configured according to actual conditions, for example, the second time period is 30min.
Fig. 2 is please referred to, Fig. 2 is charging current, cell voltage and the relational graph of time of battery.Lithium ion battery is charging
Cell voltage will appear curve as shown in Figure 2 under impulse action.Vr1, Vr2, Vr3 in Fig. 2 are indexes caused by the internal resistance of cell
Variation other than voltage increase in battery, contain a part battery polarization voltage.Therefore, extruding force test is being carried out
When, the ohmic internal resistance and polarization resistance of battery can be recorded.
Step S140, release are applied to extruding force on first battery and the second battery, and by first battery
And second second time period described in battery standing.
In the present embodiment, it after the second time period is stood, will be applied on first battery and the second battery
Extruding force release, and after extruding force release, again by second time period described in first battery and the second battery standing,
Think that subsequent operation is prepared.
Step S150, after the second time period is stood, by first battery discharge to discharging, and after being discharged
Stand the second time period, second battery charged to and is full of, and stand after fully charged the second time period and
Record the second charging capacity of second battery.
In the present embodiment, after standing again, by first battery discharge to discharging, and stand described second
Period.After standing again, second battery is charged to and is full of, after filling, by second battery standing
The second time period；After standing, the second charging capacity of second battery is recorded.
Change the extruding force, repeat above step, obtain charging capacity, the ohmic internal resistance of battery under different extruding forces
And polarization resistance.Wherein, shifting gears for extruding force can gradually be increased.
Step S160, according to the first charge capacity, the first ohmic internal resistance of first battery under different extruding forces
And first the second charge capacity, the second ohmic internal resistance and the second polarization resistance of polarization resistance and the second battery obtain test knot
Fruit.
It in the present embodiment, can be using the wherein battery in first battery, the second battery as standard, so as to root
According to the charging capacity of standard, ohmic internal resistance, polarization resistance to the measurement data of another battery (including charging capacity, ohmic internal resistance
And polarization resistance) be compared, so as to obtain test result.
Please refer to Fig. 3, Fig. 3 be the battery testing method provided in an embodiment of the present invention for becoming extruding force flow diagram it
Two.Before step S120, the method can also include step S110.
Step S110 pre-processes first battery and the second battery.
Fig. 4 is please referred to, Fig. 4 is the flow diagram of the sub-step that step S110 includes in Fig. 3.Step S110 can include
Sub-step S111, sub-step S112 and sub-step S113.
Sub-step S111, it is before extruding force is not applied, first battery progress standard charge and discharge are primary, and record institute
State the first charging capacity of the first battery.
Sub-step S112, after first battery discharge, by second time period described in first battery standing.
Sub-step S113, by second battery discharge to discharging, and stand the second time period.
In the present embodiment, it before extruding force is not applied, by the way that first battery is carried out standard charge and discharge, obtains simultaneously
Record the first charging capacity of first battery.Then, first battery is charged to and be full of, while is electric by described second
Then first battery and the second battery are stood the second time period by pond respectively to discharging, subsequently to apply extruding force
In the case of battery is tested.
By the above method, new battery can be carried out to become the test of extruding force tolerance, so as to avoid only passing through charge and discharge
Number tests battery capacity decline situation, to be further ensured that battery charging safety.
In the present embodiment, a wherein battery can include the cycle that echelon utilizes in first battery, the second battery
Battery afterwards.It, can be according to the first charge capacity of first battery of different extruding forces and the second electricity by above-mentioned test
Second charge volume in pond judges that inside battery whether there is lithium ion dendrite.Wherein, echelon, which utilizes, refers to that some has been used
The product crossed has reached primary projected life, then makes what its function completely or partially restored to be continuing with by other methods
Journey.
In the battery there are-release-cyclic process for applying-discharging during Li dendrite, is applied by extruding force, ladder will be changed
SEI films and positive plate and the interface state of negative plate in the secondary battery utilized, after squeezing apparent Li dendrite, it will lead to one
Determine the micro-short circuit or internal short-circuit of degree.Therefore it can judge that inside battery whether there is lithium ion branch according to the charge volume of battery
Crystalline substance, and then screen battery.It as a result, can be with according to whether storage lithium ion dendrite screens used batteries based on the above method.
To echelon using cycle battery carry out becoming extruding force and test, the SEI of cathode graphite linings and electrolyte can be rebuild
Film.The reliability of negative electrode of lithium ion battery has notable help after newly-built SEI films recycle raising.
Please refer to Fig. 5, Fig. 5 be the battery testing method provided in an embodiment of the present invention for becoming extruding force flow diagram it
Three.The method can also include step S171, step S172 and step S173.
Step S171, respectively according in the first ohmic internal resistance of first battery under different extruding forces and the first polarization
Resistance obtains the first ohmic internal resistance curve and the first polarization resistance curve.
Step S172, respectively according in the second ohmic internal resistance of second battery under different extruding forces and the second polarization
Resistance obtains the second ohmic internal resistance curve and the second polarization resistance curve.
Step S173 analyzes the first ohmic internal resistance curve and the second ohmic internal resistance curve, to described first
Polarization resistance curve and the second polarization resistance curve are analyzed, and judge the state of battery pole piece.
Ohmic internal resistance curve of the new battery under different extruding forces, polarization resistance curve are respectively with used batteries in identical extruding
Ohmic internal resistance curve under power, there are marked differences for polarization resistance curve.It therefore, can be by ohmic internal resistance curve, polarization
The pole piece health status of curve resolution battery is hindered, so as to the system states filter battery according to battery pole piece.
In the embodiment of the present embodiment, the battery testing method can be used for, but be not limited to, ternary lithium battery,
Lithium manganate battery, ferric phosphate lithium cell etc..
Fig. 6 is please referred to, Fig. 6 is the box signal of the battery test system 100 provided in an embodiment of the present invention for becoming extruding force
Figure.The battery test system 100 for becoming extruding force is applied to become the battery testing method of extruding force.The battery test system 100
It can include control unit 110, squeeze unit 120, measuring unit 130 and the charge/discharge unit 140 of communication connection.Wherein, institute
It states the first battery and the second battery is arranged on a testboard.
The squeeze unit 120 keeps first for applying extruding force respectively to first battery and the second battery
Period.
The measuring unit 130 is used to measure the first charge capacity, the first ohmic internal resistance and first of first battery
Second charge capacity of polarization resistance and second battery, the second ohmic internal resistance and the second polarization resistance.
The charge/discharge unit 140 is used to carry out charge and discharge to first battery and the second battery.
Described control unit 110 is used to control the work of the squeeze unit 120, measuring unit 130 and charge/discharge unit 140
Make state and the first charge capacity, the first ohmic internal resistance and the first pole according to first battery under different extruding forces
The second charge capacity, the second ohmic internal resistance and the second polarization resistance for changing internal resistance and the second battery obtain test result.
In the embodiment of the present embodiment, described control unit 110 can be computing device, for example, desktop computer, control
Device processed etc..
Described control unit 110 be additionally operable to the first charge capacity according to first battery under different extruding forces,
Second charge capacity of the first ohmic internal resistance and the first polarization resistance and the second battery, the second ohmic internal resistance and the second polarization resistance
Carry out battery screening.
In an embodiment of the present embodiment, the system can also include connector, the quantity of the connector
With the quantity Matching of battery.When battery is placed on testboard, the positive or negative pole of described connector one end and battery electrically connects
It connects, the other end is electrically connected with the measuring unit 130.The measuring unit 130 measures filling for battery by the connector
Power consumption, ohmic internal resistance and polarization resistance.
In the another embodiment of the present embodiment, it is provided on the testboard electrical with the measuring unit 130
The contact of connection, the contact are contacted with the positive or negative pole of fixed battery.It is set, can caused again by above-mentioned
The measuring unit 130 measures charge capacity, ohmic internal resistance and the polarization resistance of battery.
In the implementation embodiment of the present embodiment, the charge/discharge unit 140 can pass through connecting line or other modes
The battery charges.
In conclusion the embodiment of the present invention provides a kind of battery testing method and system for becoming extruding force.In the first battery
In the case that electric discharge terminates and the charging of the second battery terminates, first battery and the second battery are applied respectively first identical
Extruding force, and the extruding force is kept into first time period.In the case where applying extruding force, first battery is charged to
It is full, and the second time period is stood after filling, wherein, the second time period is less than the first time period；Simultaneously will
Second battery discharge is to discharging, and the second time period is stood after discharging.After standing, first battery is recorded
The first charge capacity, the first ohmic internal resistance and the first polarization resistance；Record the second ohmic internal resistance and of second battery
Two polarization resistances.Then the extruding force is discharged, and first battery and the second battery are stood into the second time period again.
After standing, by first battery discharge to discharging, and stand the second time period；Second battery is charged
To being full of, and stand the second time period and record the second charging capacity of second battery.Change extruding force, continue
Above-mentioned steps.According to charging capacity, ohmic internal resistance and the pole of first battery of the record under different extruding forces and the second battery
Change internal resistance and obtain test result.Battery is carried out as a result, to become the test of extruding force tolerance rather than only by charge and discharge number pair
Battery capacity decline situation is tested.New battery can not only be tested by the above method, it can also be to used batteries
It is screened.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, that is made any repaiies
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of battery testing method for becoming extruding force, which is characterized in that the method includes：
After the first battery discharge terminates and the second battery charges, first battery and the second battery are applied respectively crowded
Pressure, and the extruding force first time period is kept, while first battery is charged to and is full of, by second battery discharge
To discharging；
In the first time period, when will be filled with electric first battery and second battery standing the second being discharged
Between after section, record the first charge capacity, the first ohmic internal resistance and the first polarization resistance and the second battery of first battery
Second ohmic internal resistance and the second polarization resistance, wherein, the second time period is less than the first time period；
Release is applied to extruding force on first battery and the second battery, and by first battery and the second battery standing
The second time period；
After the second time period is stood, by first battery discharge to discharging, and described second is stood after being discharged
Second battery is charged to and is full of by the period, and the second time period is stood after fully charged and records described second
Second charging capacity of battery；
Change the extruding force, repeat above step, according to first of first battery under different extruding forces the charging electricity
Amount, the first ohmic internal resistance and the second charge capacity of the first polarization resistance and the second battery, the second ohmic internal resistance and the second polarization
Internal resistance obtains test result.
2. according to the method described in claim 1, it is characterized in that, terminate described in the first battery discharge and the second battery fills
After electricity, extruding force is applied respectively to first battery and the second battery, and keep the extruding force first time period, simultaneously
First battery is charged to and is full of, by second battery discharge to before the step of discharging, the method further includes：
First battery and the second battery are pre-processed；
Described the step of being pre-processed to first battery and the second battery, includes：
Before extruding force is not applied, first battery carries out to standard charge and discharge are primary, and record the of first battery
One charging capacity；
After first battery discharge, by second time period described in first battery standing；
By second battery discharge to discharging, and stand the second time period.
3. according to the method described in claim 1, it is characterized in that, the method further includes：
Battery is judged according to the first charge capacity of first battery of different extruding forces and the second charge volume of the second battery
Inside whether there is lithium ion dendrite.
4. according to the method described in claim 1, it is characterized in that, the method further includes：
The first Europe is obtained according to the first ohmic internal resistance of first battery under different extruding forces and the first polarization resistance respectively
Nurse internal drag curve and the first polarization resistance curve；
The second Europe is obtained according to the second ohmic internal resistance of second battery under different extruding forces and the second polarization resistance respectively
Nurse internal drag curve and the second polarization resistance curve；
The first ohmic internal resistance curve and the second ohmic internal resistance curve are analyzed, to the first polarization resistance curve and
Second polarization resistance curve is analyzed, and judges the state of battery pole piece.
5. according to the method described in claim 4, it is characterized in that, the method further includes：
According to the system states filter battery of battery pole piece.
6. according to the method described in claim 1, it is characterized in that, described apply first battery and the second battery respectively
The mode of extruding force includes：
Horizontal type extruding is carried out to first battery and the second battery respectively.
7. a kind of battery test system for becoming extruding force, which is characterized in that applied to described in any one in claim 1-6
Method, the system comprises the control unit of electric connection, squeeze unit, measuring unit and charge/discharge unit, wherein, described
One battery and the second battery are arranged on a testboard,
The squeeze unit is used to apply extruding force respectively, and keep first time period to first battery and the second battery；
The measuring unit is used to measure the first charge capacity, the first ohmic internal resistance and the first polarization resistance of first battery
And the second charge capacity, the second ohmic internal resistance and the second polarization resistance of second battery；
The charge/discharge unit is used to carry out charge and discharge to first battery and the second battery；
Described control unit be used for control the squeeze unit, measuring unit and charge/discharge unit working condition and according to
The first charge capacity, the first ohmic internal resistance and the first polarization resistance and the second battery of first battery under different extruding forces
The second charge capacity, the second ohmic internal resistance and the second polarization resistance obtain test result.
8. system according to claim 7, which is characterized in that described control unit is additionally operable to according under different extruding forces
First battery the first charge capacity, the first ohmic internal resistance and the first polarization resistance and the second battery second charging electricity
Amount, the second ohmic internal resistance and the second polarization resistance carry out battery screening.
9. system according to claim 7, which is characterized in that the system also includes connector, the number of the connector
Amount and the quantity Matching of battery,
The positive or negative pole of described connector one end and battery is electrically connected, and the other end is electrically connected with the measuring unit, institute
State charge capacity, ohmic internal resistance and polarization resistance that measuring unit measures battery by the connector.
10. system according to claim 7, which is characterized in that be provided on the testboard and measuring unit electricity
Property connection contact, the contact contacts with the positive or negative pole of fixed battery, so that measuring unit measurement
Charge capacity, ohmic internal resistance and the polarization resistance of battery.
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| CN112903164B (en) * | 2021-03-09 | 2023-07-14 | 武汉三江航天远方科技有限公司 | Detection device for simultaneously monitoring internal resistance load pressure and elastic deformation on line |
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