CN110456275A - A kind of method and system of judgement battery core analysis lithium - Google Patents
A kind of method and system of judgement battery core analysis lithium Download PDFInfo
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- CN110456275A CN110456275A CN201910791588.XA CN201910791588A CN110456275A CN 110456275 A CN110456275 A CN 110456275A CN 201910791588 A CN201910791588 A CN 201910791588A CN 110456275 A CN110456275 A CN 110456275A
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- battery core
- expansive force
- single battery
- soh value
- analysis lithium
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
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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]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
-
- 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
- G01R31/387—Determining ampere-hour charge capacity or SoC
-
- 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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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Abstract
The invention discloses a kind of method and system of judgement battery core analysis lithium, and wherein method includes: to detect the expansive force and SOH value of single battery core；The variation tendency of the expansive force and SOH value is analyzed respectively；When the variation tendency of the expansive force of the single battery core and SOH value occurs abnormal simultaneously, the single battery core analysis lithium is determined.System includes: first detection unit, the second detection unit of the expansive force and SOH value for detecting single battery core；For analyzing the variation tendency of the expansive force and SOH value and the analysis determination unit of determining analysis lithium phenomenon respectively.The method and system of judgement battery core analysis lithium provided by the invention, it is reacted by analysis battery core expansive force and SOH value variation tendency with timely and accurately judging whether battery core generates analysis lithium, ensure that battery using safe, reduce the incidence of safety accident to a certain extent.
Description
Technical field
The present invention relates to technical field of lithium battery detection more particularly to a kind of method and system of judgement battery core analysis lithium.
Background technique
Rectangular/soft package power lithium ion battery is able to its high-energy density and characteristic convenient for assembly in new energy vapour
It is widely applied in vehicle.
There is analysis lithium phenomenon with the passage for using the time or the increase of cycle charging number inside battery core in single battery core
When, inner pole piece can accelerate to thicken, and lead to battery core internal expansion power accelerated growth, simultaneous battery core SOH (State Of
Health completely fills percentage of the capacity with respect to rated capacity) accelerate decaying.If occurring to analyse lithium phenomenon it is possible to that safety can be brought
Hidden danger: on the one hand, since the part lithium metal of precipitation can not be oxidized to lithium ion in electric discharge, it will cause declining for battery capacity
Subtract；On the other hand, if the dendrite that the lithium metal of precipitation forms continued propagation pierces through diaphragm, it is likely that can induce short in battery
Road leads to serious safety accident.
It is single for the Comparison between detecting methods of negative electrode of lithium ion battery analysis lithium in the prior art, after mostly using dismantling battery greatly
Morphology analysis is carried out to it by Electronic Speculum or microscope, but if dendrite has grown into the degree come that can observe, electricity
Pond has often failed safety standards.If analysis lithium phenomenon cannot be detected in time, the subsequent detection of all is likely to be horse
Big gun afterwards can not take in time means to avoid the generation of safety accident.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of method and system of judgement battery core analysis lithium, solves existing skill
In art is difficult to for battery core analysis lithium phenomenon the problem of detected in time.
To achieve the above object, the present invention provides technical solution below:
A method of judging that battery core analyses lithium, comprising:
Detect the expansive force and SOH value (State Of Health) of single battery core；The SOH value is for reflecting battery
Capacity, health degree and performance state, i.e. battery completely fill percentage of the capacity with respect to rated capacity, the SOH value of the new battery that dispatches from the factory
It is 100%, the SOH value of battery is 80% when scrapping completely；
The variation tendency of the expansive force and SOH value is analyzed respectively；When the expansive force of the single battery core and the change of SOH value
When change trend occurs abnormal simultaneously, the single battery core analysis lithium is determined.
Optionally, the expansive force and SOH value of single battery core the step: are detected, comprising:
When charge and discharge cycles of every completion, the expansive force and SOH value of single battery core are detected.
Optionally, the step: the variation tendency of the expansive force and SOH value is analyzed respectively, comprising:
The variation tendency of the expansive force in unit detection cycle and SOH value is analyzed；M charge and discharge of every progress
Circulation is a detection cycle；M is the natural number greater than 1.
Optionally, the step: when exception occur simultaneously in the expansive force of the single battery core and the variation tendency of SOH value
When, determine the single battery core analysis lithium, comprising:
The expansive force of the corresponding single battery core of number of number and each charge and discharge cycles based on charge and discharge cycles carries out
Curve matching obtains expansion force curve；When expansive force slope of a curve change rate described in unit detection cycle is greater than preset
When expansive force slope variation threshold value, or when expansion force curve deviated line growth/parabola growth growth trend path, determine
The expansive force variation tendency of the single battery core occurs abnormal.
Optionally, the step: when exception occur simultaneously in the expansive force of the single battery core and the variation tendency of SOH value
When, determine the single battery core analysis lithium, comprising:
Expansive force is very poor in acquisition unit detection cycle, analyzes the change rate that expansive force is very poor in N number of unit detection cycle；
When the very poor change rate of expansive force change threshold very poor greater than preset expansive force, the expansion of the single battery core is determined
Power variation tendency occurs abnormal；N is the natural number greater than 1.
Optionally, the step: when exception occur simultaneously in the expansive force of the single battery core and the variation tendency of SOH value
When, determine the single battery core analysis lithium, comprising:
The SOH value march of the corresponding single battery core of number of number and each charge and discharge cycles based on charge and discharge cycles
Line fitting, obtains SOH value curve；When SOH value slope of a curve change rate described in unit detection cycle is oblique greater than preset SOH
It is abnormal to determine that the SOH value variation tendency of the single battery core occurs for rate change threshold.
Optionally, the value of the M is 50 or 100.
Optionally, the value range of the N is 2-100.
The present invention also provides a kind of systems of judgement battery core analysis lithium, comprising:
First detection unit, for detecting the expansive force of single battery core；
Second detection unit, the SOH value for single battery core；
Determination unit is analyzed, for analyzing the variation tendency of the expansive force and SOH value respectively；And in the single battery core
Expansive force and the variation tendency of SOH value when occurring abnormal, determine the single battery core analysis lithium.
It optionally, further include counting unit, the counting unit is used in the detection process to the number of charge and discharge cycles
And detection cycle is counted；
The first detection unit and second detection unit are in charge and discharge cycles of every completion, respectively to single battery core
Expansive force and SOH value detected；
The analysis determination unit divides the variation tendency of the expansive force and SOH value in unit detection cycle
Analysis, and every M charge and discharge cycles of progress are a detection cycle.
Compared with prior art, the invention has the following advantages:
The present invention provides a kind of method and system of judgement battery core analysis lithium, are become by analysis battery core expansive force and SOH value
Change trend timely and accurately to judge whether battery core generates analysis lithium reaction, ensure that battery using safe, to a certain degree
The upper incidence for reducing safety accident.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other attached drawings according to these attached drawings.
Fig. 1 is the flow diagram for the method that a kind of judgement battery core provided by the invention analyses lithium；
Fig. 2 be it is provided by the invention it is a kind of judgement battery core analyse lithium method in it is corresponding with table one, based on expansion force data
The curve graph being fitted with the number of charge and discharge cycles；
Fig. 3 be a kind of judgement battery core provided by the invention analyse in the method for lithium it is corresponding with table one, based on SOH value data and
The curve graph of the number fitting of charge and discharge cycles；
Fig. 4 be it is provided by the invention it is a kind of judgement battery core analyse lithium method in it is corresponding with table two, based on expansion force data
The curve graph being fitted with the number of charge and discharge cycles；
Fig. 5 be a kind of judgement battery core provided by the invention analyse in the method for lithium it is corresponding with table two, based on SOH value data and
The curve graph of the number fitting of charge and discharge cycles；
Fig. 6 is the knot that a kind of judgement battery core provided by the invention analyses first detection unit and single battery core in the system of lithium
Structure schematic diagram；
Fig. 7 is the structural block diagram for the system that a kind of judgement battery core provided by the invention analyses lithium.
In above-mentioned figure: 10, single battery core；11, first detection unit；12, second detection unit；13, counting unit；14,
Analyze determination unit.
Specific embodiment
To enable the purpose of the present invention, feature, advantage more obvious and understandable, implement below in conjunction with the present invention
Attached drawing in example, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that reality disclosed below
Applying example is only a part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, this field is common
Technical staff's all other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
With the passage for using the time or the increase of cycle charging number, inner pole piece can expand to be thickened single battery core, is led
Core inner expansive force is sent a telegraph to gradually increase；And the increase of thickness is possible to will lead to the generation of analysis lithium phenomenon, analyses the meeting again of lithium phenomenon
Expansive force is caused to sharply increase.Since a power battery pack includes multiple mould groups, a mould group includes multiple battery core monomers, mesh
The expansive force that a mould group can bear in preceding new energy car battery packet is about in 2000Kg.f or so, if battery core expansive force is super
The range is crossed, then consequence is hardly imaginable.
In addition, other than expansive force sharply increases, being accompanied by SOH acceleration when generating analysis lithium reaction inside battery core and declining
Subtract.In order to improve the safety improved in battery use process, need to increase in the detection to battery core for analysis lithium phenomenon
Detection.But since the detection in the prior art for analysis lithium phenomenon is more single, on the one hand it is difficult to accurately judge to analyse lithium
Occur, it is on the other hand, also not prompt enough for the judgement for analysing lithium, lead to when detecting analysis lithium phenomenon that be possible to battery existing
Higher security risk can not play preventive effect.
The present invention intends to provide a kind of method and system of judgement battery core analysis lithium, occurred when analysing lithium phenomenon using battery core
Expansive force sharply increase with SOH accelerate decaying property, with judge whether to occur inside battery core analyse lithium phenomenon.
To further illustrate the technical scheme of the present invention below with reference to the accompanying drawings and specific embodiments.
Embodiment one
Referring Figure 1, including the following steps: the embodiment of the invention provides a kind of method of judgement battery core analysis lithium
S1, the expansive force and SOH value for detecting single battery core.
In the step, a whens charge and discharge cycles of every completion, detects the expansive force and SOH value of single battery core.Its
In, by installing membrane-type pressure sensors between single battery core, to obtain single battery core during expansion caused by pressure, into
And obtain the expansion force data of single battery core.
SOH detecting instrument in the prior art can be used in the detection of SOH value and method is realized.For example, application No. is
CN201810196318.X, a kind of entitled battery pack SOH detection method, device and equipment patent document in, it is detailed
Ground describes the correlation detection technology of SOH, therefore for the specific technical solution of SOH value detection, is not repeated here herein.
S2, the variation tendency for analyzing the expansive force and SOH value respectively.
It in the step, is analyzed respectively by the variation tendency to expansive force and SOH, for judging whether to analyse
Lithium phenomenon.
Specifically, in analysis, the variation tendency of the expansive force in unit detection cycle and SOH value is divided
Analysis；It is every to carry out M charge and discharge cycles as a detection cycle.Moreover, analyzing the expansive force of M charge and discharge cycles in a cycle
When variation, the expansive force recycled every time must take identical SOC or voltage.
In addition, one detection cycle may also be configured to if the battery core is applied to the battery pack of New-energy electric vehicle: every
Completing the nominal maximum course continuation mileage (such as 400Km) of M train enterprise is a detection cycle.In the present embodiment, the value of M is 50
Or 100, i.e., the every maximum course continuation mileage of 50/100 charge and discharge cycles or vehicle enterprise nominally that carries out is a detection cycle.
It is understood that the value of M can be adjusted according to the actual situation, such as be taken as 200,300 etc., due to for
The adjustment of the value does not need to make the creative labor, therefore other values of M are within the scope of the invention.
S3, when the variation tendency of the expansive force of the single battery core and SOH value simultaneously occur abnormal when, determine the monomer
Battery core analyses lithium.
It is understood that this refer to simultaneously be not it is temporal simultaneously, and refer to expansive force and SOH value and be all satisfied exception
It is when condition while exception occurs.
In the step, by analyze result judge single battery core expansive force and SOH value variation tendency whether occur it is different
Often；When the variation tendency of expansive force and SOH value is judged as that appearance is abnormal simultaneously, determine that the single battery core analyses lithium.
Specifically, for the analysis of the variation tendency of expansive force, mainly pass through expansive force extreme value change rate and expansive force
Variation pattern two ways analyzed, meeting one can be judged as that appearance is abnormal.
Analysis for the variation pattern of expansive force is specific as follows:
The expansive force of the corresponding single battery core of number of number and each charge and discharge cycles based on charge and discharge cycles carries out
Curve matching obtains expansion force curve；When expansive force slope of a curve change rate described in unit detection cycle is greater than preset
When expansive force slope variation threshold value, or when expansion force curve deviated line growth/parabola growth growth trend path, determine
The expansive force variation tendency of the single battery core occurs abnormal.
Specifically, expansive force slope variation threshold value is 30% in the present embodiment.
It is understood that the growth trend path that expansion force curve deviated line growth/parabola increases, i.e. expansive force
Curve is not belonging to linear increase or parabola increases, and when there is this kind of situation, the variation tendency of expansive force is judged as that appearance is different
Often.
Analysis for the extreme value change rate of expansive force is specific as follows:
It is very poor to obtain expansive force in unit detection cycle, i.e., the maximum value and minimum value of expansive force in unit detection cycle,
Analyze the change rate that expansive force is very poor in N number of unit detection cycle；When the very poor change rate of the expansive force is greater than preset swollen
When the very poor change threshold of expansive force, it is abnormal to determine that the expansive force variation tendency of the single battery core occurs.
Specifically, the very poor change threshold 50% of expansive force in the present embodiment.
In the present embodiment, under the premise of every 50 or 100 charge and discharge cycles of circulation are a detection cycle, N's is taken
Being worth range is 2~100.
It is analyzed as follows for the variation tendency of SOH value:
The SOH value march of the corresponding single battery core of number of number and each charge and discharge cycles based on charge and discharge cycles
Line fitting, obtains SOH value curve；When SOH value slope of a curve change rate described in unit detection cycle is oblique greater than preset SOH
It is abnormal to determine that the SOH value variation tendency of the single battery core occurs for rate change threshold.
Specifically, SOH slope variation threshold value is 30% in the present embodiment.
It is understood that in the another embodiment of the present embodiment, adjustment expansive force slope variation threshold value, expansion
The very poor change threshold of power and the numerical value of SOH slope variation threshold value can be adjusted according to the actual situation.
In addition, by adjusting expansive force slope variation threshold value, the very poor change threshold of expansive force and SOH slope variation threshold value
There is abnormal threshold in numerical value, also adjustable be judged as.If above-mentioned numerical value value range includes may when analysis lithium will occur
The variation range of appearance reduces and is judged as abnormal threshold occur, early warning can be carried out when that will occur and analyse lithium, to reach
To the purpose for identifying security risk in advance.
Below by taking every charge and discharge cycles of completion are to carry out the experimental method of one-time detection as an example, Binding experiment data print
Demonstrate,prove the reliability of above-mentioned detection method.
Incorporated by reference to reference Fig. 2,3 and following table one.
Table one
Wherein, table one is to expand the variation of force data and SOH value data with the increase of the number of charge and discharge cycles.Its
In, expansion force data obtains the battery core detection under 50%SOC state by the thickness membranous type piezoelectric transducer with a thickness of 1mm.
In addition, 1# battery core is the battery core under normal condition, 2# battery core is that the battery core of analysis lithium phenomenon occurs.
Incorporated by reference to reference Fig. 4,6 and following table two.
Table two
Wherein, table two is to expand the variation of force data and SOH value data with the increase of the number of charge and discharge cycles.Its
In, expansion force data obtains the battery core detection under 100%SOC state by the thickness membranous type piezoelectric transducer with a thickness of 2mm.
In addition, 3# battery core is the battery core under normal condition, 4# battery core is that the battery core of analysis lithium phenomenon occurs.
The method of judgement battery core analysis lithium provided in this embodiment, it is anti-on the one hand can to judge whether battery core occurs analysis lithium in time
It answers, effectively to identify potential security risk；On the one hand it can be realized and early warning carried out to battery core analysis lithium, arranged to take in advance
It applies, further increases safety；In addition, expansive force number of the battery core under various use conditions can also be collected by this method
According to the design for battery core, mould group and battery pack provides data basis.
Embodiment two
Based on embodiment one, the present embodiment two provides a kind of system of judgement battery core analysis lithium, for realizing as described above
Judgement battery core analysis lithium method.
Specifically, the system of judgement battery core analysis lithium includes: first detection unit 11, for detecting the swollen of single battery core 10
Expansive force；Second detection unit 12, the SOH value for single battery core 10；Determination unit 14 is analyzed, for analyzing the expansion respectively
The variation tendency of power and SOH value；And occurs exception simultaneously in the variation tendency of the expansive force of the single battery core 10 and SOH value
When, determine that the single battery core 10 analyses lithium.The first detection unit 11, second detection unit 12 and analysis determination unit 14 pass through
Wired or wireless mode connects.
As shown in Figure 6, Figure 7, in the present embodiment, first detection unit 11 is set between single battery core 10, including pressure
Sensor, such as diffusion silicon pressure sensor, piezoelectric pressure indicator, foil gauge (mechanics) pressure sensor, sapphire pressure
Sensor, ceramic pressure sensor etc. to realize the detection to single battery core 10 because of the pressure of expansion formation, and then are able to detect
The expansive force of battery core.In addition, varistor or piezoelectric transducer also can be used in the first detection unit 11.
Due to the usual light weight of pressure sensor above-mentioned, small in size, when being placed between single battery core 10, in addition to providing
Detection function, additionally it is possible to buffering spacer is served as, so that the expansion for battery core volume provides certain buffer function.
Determination unit 14 is analyzed, BMS (BATTERY MANAGEMENT SYSTEM, battery management system) specifically can be used
It is realized.The expansive force and SOH value of single battery core 10 are detected by first detection unit 11, second detection unit 12, concurrently
It send into the analysis determination unit 14, whether occurs analysing lithium phenomenon with comprehensive descision.
In addition, the system of judgement battery core analysis lithium further includes counting unit 13, the counting unit 13 was for detecting
The number of the maximum course continuation mileage nominal to the number of charge and discharge cycles or completion vehicle enterprise and detection cycle are counted in journey
Number.Based on this, the first detection unit 11 and second detection unit 12 are in charge and discharge cycles of every completion or every completion vehicle
When looking forward to nominal maximum course continuation mileage, the expansive force and SOH value of single battery core 10 are detected respectively；The analysis determines single
Member 14 analyzes the variation tendency of the expansive force and SOH value in unit detection cycle, and M charge and discharge of every progress follow
Ring is a detection cycle.In the present embodiment, it 50/100 charge and discharge cycles of every progress or every carries out filling vehicle enterprise for 50/100 time
Nominal maximum course continuation mileage is a detection cycle.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although referring to before
Stating embodiment, invention is explained in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of method of judgement battery core analysis lithium characterized by comprising
Detect the expansive force and SOH value of single battery core；
The variation tendency of the expansive force and SOH value is analyzed respectively；When the expansive force of the single battery core and the variation of SOH value become
When gesture occurs abnormal simultaneously, the single battery core analysis lithium is determined.
2. the method for judgement battery core analysis lithium according to claim 1, which is characterized in that the step: detection single battery core
Expansive force and SOH value, comprising:
When charge and discharge cycles of every completion, the expansive force and SOH value of single battery core are detected.
3. the method for judgement battery core analysis lithium according to claim 2, which is characterized in that the step: respectively described in analysis
The variation tendency of expansive force and SOH value, comprising:
The variation tendency of the expansive force in unit detection cycle and SOH value is analyzed；M charge and discharge cycles of every progress
For a detection cycle；M is the natural number greater than 1.
4. the method for judgement battery core analysis lithium according to claim 3, which is characterized in that the step: when the monomer electricity
When the expansive force of core and the variation tendency of SOH value occur abnormal simultaneously, the single battery core analysis lithium is determined, comprising:
The expansive force of the corresponding single battery core of number of number and each charge and discharge cycles based on charge and discharge cycles carries out curve
Fitting obtains expansion force curve；When expansive force slope of a curve change rate described in unit detection cycle is greater than preset expansion
When power slope variation threshold value, or when expansion force curve deviated line growth/parabola growth growth trend path, described in determination
The expansive force variation tendency of single battery core occurs abnormal.
5. the method for judgement battery core analysis lithium according to claim 4, which is characterized in that the step: when the monomer electricity
When the expansive force of core and the variation tendency of SOH value occur abnormal simultaneously, the single battery core analysis lithium is determined, further includes:
Expansive force is very poor in acquisition unit detection cycle, analyzes the change rate that expansive force is very poor in N number of unit detection cycle；Work as institute
When stating the very poor change rate of expansive force greater than the very poor change threshold of preset expansive force, determine that the expansive force of the single battery core becomes
Change trend occurs abnormal；N is the natural number greater than 1.
6. the method for judgement battery core analysis lithium according to claim 5, which is characterized in that the step: when the monomer electricity
When the expansive force of core and the variation tendency of SOH value occur abnormal simultaneously, the single battery core analysis lithium is determined, comprising:
It is quasi- that the SOH value of the corresponding single battery core of number of number and each charge and discharge cycles based on charge and discharge cycles carries out curve
It closes, obtains SOH value curve；When SOH value slope of a curve change rate described in unit detection cycle becomes greater than preset SOH slope
Change threshold value, it is abnormal to determine that the SOH value variation tendency of the single battery core occurs.
7. the method for judgement battery core analysis lithium according to claim 3, which is characterized in that the value of the M is 50 or 100.
8. it is according to claim 5 judgement battery core analysis lithium method, which is characterized in that the value range of the N be 2~
100。
9. a kind of system of judgement battery core analysis lithium characterized by comprising
First detection unit, for detecting the expansive force of single battery core；
Second detection unit, the SOH value for single battery core；
Determination unit is analyzed, for analyzing the variation tendency of the expansive force and SOH value respectively；And in the swollen of the single battery core
When the variation tendency of expansive force and SOH value occurs abnormal, the single battery core analysis lithium is determined.
10. the system of judgement battery core analysis lithium according to claim 9, which is characterized in that it further include counting unit, the meter
Counting unit is in the detection process counting the number of charge and discharge cycles and detection cycle；
The first detection unit and second detection unit are in charge and discharge cycles of every completion, respectively to the swollen of single battery core
Expansive force and SOH value are detected；
The analysis determination unit analyzes the variation tendency of the expansive force and SOH value in unit detection cycle, and
It is every to carry out M charge and discharge cycles as a detection cycle.
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