CN109888416A - A kind of method that lithium ion battery combines in series and parallel - Google Patents
A kind of method that lithium ion battery combines in series and parallel Download PDFInfo
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- CN109888416A CN109888416A CN201910161893.0A CN201910161893A CN109888416A CN 109888416 A CN109888416 A CN 109888416A CN 201910161893 A CN201910161893 A CN 201910161893A CN 109888416 A CN109888416 A CN 109888416A
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- 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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- 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
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Abstract
The present invention relates to a kind of methods that lithium ion battery combines in series and parallel, take the connection type composition battery module for first connecting again in parallel, multiple single battery cores are first subjected to series connection welding with nickel strap, form Li-ion batteries piles, postsearch screening is carried out by unit of Li-ion batteries piles, sorting combination is carried out further according to demand principle in parallel, is welded parallel using nickel strap, finally forms lithium ionic cell module.The method that lithium ion battery provided by the invention combines in series and parallel, scientific structure design is reasonable, overall performance is stablized, overcome the elder generation of the prior art and the connection type gone here and there afterwards present in high and excessively high to the technical requirements of welding in the subsequent welding procedure defect of the coherence request to single battery core, the needs of practical application can be met well.
Description
Technical field
The invention belongs to technical field of lithium ion, and in particular to a kind of method that lithium ion battery combines in series and parallel.
Background technique
Demand of the country in terms of clean energy resource is increasing at present, in using energy source, clean energy vehicle nearly 2 years
Have become the fastest industry of China Automobile Industry, electric car makes novel energy-storing to the requirements at the higher level of lithium ion battery
The technology of battery is fast-developing, and the novel energy storage cells such as lithium ion key technology, critical material and product research all achieve weight
Big progress.The main performance of monomer lithium ion battery needs to combine monomer in series and parallel it is impossible to meet requirement, with
Adapt to the actual demand of different user.
Lithium ion battery popularization and application have entered fast-developing period, and lithium ion battery is widely used at present: intelligent hand
Machine battery product, cells in notebook computer product, tablet computer battery product, balance car battery product, personal nursing and suction
The small household appliances battery product such as dirt device, power and energy-storage battery product, other digital class battery products, lamps and lanterns market battery product
Deng.
The main problem of lithium ion lithium battery applications is still to be declined afterwards using capacity decline, the lost of life, safety in groups
The problem of.The reason of causing problem above is: the development of previous stage lithium ion battery focuses on critical material, battery knot
In structure design, battery manufacture key technology and single battery core product development, the series-parallel designing technique of combination does not obtain deeply thin
The research of cause.Even if the consistent battery core of performance in actual use still can be because of combination in screening process
It is not scientific and reasonable, and there are the risks of performance decline, even result in battery failure.
When lithium ion battery parallel connection, voltage is equal everywhere, i.e. Ua=Ub=Uc=Uo；Electric current be each sub- battery current it
With i.e. Io=Ia+Ib+Ic.Sub- battery parallel connection is suitble to voltage constant, and electric current needs the occasion increased.When lithium ion battery is connected,
Electric current is equal everywhere, i.e. Io=Ia=Ib=Ic；Voltage is the sum of each sub- cell voltage, i.e. Uo=Ua+Ub+Uc.Sub- battery
It is used in series the occasion that suitable electric current is constant, and voltage needs increase.Either series connection or in parallel, the output of Li-ion batteries piles
Power all increases.
The combinatorial principle of lithium ion battery cell seems simply, and actual conditions are extremely complex, because between single battery core
Even if only existing fine difference, can be also amplified during go here and there mostly simultaneously, to bring the very big trouble of application end, very more
To a series of problems, such as leading to failure, safety.In lithium ionic cell module, in the fabrication process due to each single battery core
Various conditions are unable to reach identical, cause between each single battery core in battery pack there are a degree of otherness, even
Difference caused by continuous charge and discharge cycles will lead to the performance decline of certain single battery cores, such as capacity accelerates decaying etc., therefore
The inhomogeneities that the performance decline of certain single battery cores will lead to battery module increases, and eventually leads to the overall performance of battery module
Decline, reduced service life.Therefore, the combination of lithium ion battery needs well-designed and corresponding technological means is taken to guarantee
Reach design requirement.
Summary of the invention
For above-mentioned problems of the prior art, it can avoid above-mentioned skill occur the purpose of the present invention is to provide one kind
The method that the lithium ion battery of art defect combines in series and parallel.
In order to achieve the above-mentioned object of the invention, technical solution provided by the invention is as follows:
A kind of method that lithium ion battery combines in series and parallel takes the connection type composition battery pack mould for first connecting again in parallel
Block.
Further, which comprises multiple single battery cores are first subjected to series connection welding with nickel strap, form lithium-ion electric
Pond group carries out postsearch screening by unit of Li-ion batteries piles, sorting combination is carried out further according to demand principle in parallel, using nickel strap
Parallel welding, finally forms lithium ionic cell module.
A kind of lithium ionic cell module, the Li-ion batteries piles including multiple parallel connections, each Li-ion batteries piles are by multiple
Single battery core is composed in series.
A kind of method of the single battery core of performance decline in detection lithium ionic cell module, comprising the following steps:
Step 1): proof discharge experiment is carried out to lithium ionic cell module, records each list of lithium ionic cell module
Body battery core is during discharge in the voltage at each time point of setting；
The voltage value at each the last one time point of single battery core recorded in experiment in step 1) is denoted as sample by step 2)
This A judges whether the sample A is in normal distribution, if so, being then directly transferred to step 3)；Otherwise, sample A is carried out non-linear
Transformation makes it be transferred to step 3) again in after normal distribution；
Step 3) finds out the confidence interval of the normal distribution mean μ of sample A, and taking the lower limit of the confidence interval is standard, institute
State sample A lower than this standard single battery core be then performance decline single battery core.
Further, judgement sample A whether be in normal distribution method are as follows: calculate sample A coefficient skewness sc, work as calculating
When coefficient skewness sc out is between 0.5~0.5, it is believed that sample A is in normal distribution；Otherwise, it is believed that sample A is unsatisfactory for just
State distribution.
Further, the calculation formula of the coefficient skewness sc is as follows:
,
Wherein, sample A=(x1, x2..., xi..., xN), N is the number of single battery core in battery module, namely sample A
In the single battery core voltage value number that records；X is i-th of single battery core voltage value in sample A, i=1,2 ... N；With σ (x)
The mean value and standard deviation of each voltage value in respectively sample A, are calculated using following formula:
,
。
Further, judgement sample A whether be in normal distribution method are as follows: using in matrix labotstory software carry ginseng
Number examines order to test sample A, if carrying out normal distribution-test to sample A in the case where significance is α
As a result it is 1, then determines that sample A is unsatisfactory for normal distribution；α is the value in [0,1] range, is determined by width of confidence interval.
Further, to sample A carry out nonlinear transformation method are as follows: to each voltage value carry out exponentiation, open radical sign, fall
Number, index take logarithm.
Further, the step 3) includes: to find out setting for sample A with the parameter command carried in matrix labotstory software
Believe section.
The method that lithium ion battery provided by the invention combines in series and parallel, scientific structure design is reasonable, and overall performance is stablized,
Overcome the elder generation of the prior art and the connection type gone here and there afterwards present in it is high to the coherence request of single battery core and subsequent
Welding procedure in the defect excessively high to the technical requirements of welding, the needs of practical application can be met well.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of Li-ion batteries piles；
Fig. 2 is the structural schematic diagram of lithium ionic cell module.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawing and specific implementation
The present invention will be further described for example.It should be appreciated that described herein, specific examples are only used to explain the present invention, and does not have to
It is of the invention in limiting.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
A kind of method that lithium ion battery combines in series and parallel, voltage and appearance according to Li-ion batteries piles actually required
Amount takes the connection type composition battery module for first connecting again in parallel；Single battery core is first subjected to series connection welding with nickel strap, is reached
To the actual demand of voltage, form Li-ion batteries piles, be that unit carries out postsearch screening with group, further according to demand principle in parallel into
Row sorting combination, is welded parallel using nickel strap, to meet the actual demand of capacity, finally forms lithium ionic cell module.
As depicted in figs. 1 and 2, lithium ionic cell module of the invention is using cylindrical battery core as minimum unit, in embodiment
Connection type be equally applicable to other type lithium ion batteries.Include in the on-link mode (OLM) monocell battery core 1 shown in Fig. 1,2,
3,4,5, include three battery core unit groups 8,9,10 shown in the cathode 6 of entire battery core unit, 7, Fig. 2 of anode, and entire lithium from
The module negative 11 and anode 12 of sub- battery.
Single battery core 1,2,3,4,5 is first subjected to series connection welding with nickel strap, welds negative electrode lug 6 and anode ear 7.Reach voltage
Actual demand, formed Li-ion batteries piles, with group be unit carry out postsearch screening, sorted further according to demand principle in parallel
Combination, is welded 8,9,10 using nickel strap, welds negative electrode lug 11 and anode ear 12, parallel to meet the practical need of capacity
It asks, finally forms lithium ionic cell module.
The present invention can solve the below technical problem that in the use process of battery module when performance occurs in single battery core
When decline, the capacity decline of entire battery pack or entire battery pack failure.
The consistency of single battery core is wanted present in the connection type gone here and there the present invention overcomes the elder generation of the prior art and afterwards
Seek high and excessively high to the technical requirements of welding defect in subsequent welding procedure.
It detects the single battery core of performance decline, and it is replaced with new single battery core, this is to solve certain monomer electricity
The inhomogeneities that the performance decline of core will lead to battery module increases, and eventually leads to the overall performance decline of battery module, uses
A kind of method of this problem of the lost of life.
A method of detecting the single battery core that performance declines in above-mentioned lithium ionic cell module, comprising the following steps:
Step 1): proof discharge experiment is carried out to lithium ionic cell module, records each list of lithium ionic cell module
Body battery core is during discharge in the voltage at each time point of setting；
The voltage value at each the last one time point of single battery core recorded in experiment in step 1) is denoted as sample by step 2)
This A judges whether the sample A is in normal distribution, if so, being then directly transferred to step 3)；Otherwise, sample A is carried out non-linear
Transformation makes it be transferred to step 3) again in after normal distribution；
Judgement sample A whether be in normal distribution method are as follows: calculate sample A coefficient skewness sc, it is inclined when what is calculated
When oblique coefficient sc is between 0.5~0.5, it is believed that sample A is in normal distribution；Otherwise, it is believed that sample A is unsatisfactory for normal distribution；
The calculation formula of the coefficient skewness sc is as follows:
,
Wherein, sample A=(x1, x2... xi..., xN), N is the number of single battery core in battery module, namely in sample A
The single battery core voltage value number of record；X is i-th of single battery core voltage value in sample A, i=1,2 ... N；With σ (x) points
Not Wei in sample A each voltage value mean value and standard deviation, calculated using following formula:
,
；
Judgement sample A whether be in normal distribution method are as follows: using in MATLAB software carry parametric test order pair
Sample A tests, if carrying out the result of normal distribution-test to sample A in the case where significance is α is 0, then sentences
This A of random sample meets normal distribution；If being to the sample A result for carrying out normal distribution-test in the case where significance is α
1, then determine that sample A is unsatisfactory for normal distribution；α is the value in [0,1] range, is determined by width of confidence interval.
The method that nonlinear transformation is carried out to sample A are as follows: exponentiation is carried out to each voltage value, radical sign, inverse, index is opened or takes
Logarithm.
Assuming that sample A be meet normal distribution or t distribution (by knowledge of statistics, it can be seen that t to be distributed in sample enough
It is very close to normal distribution in the case where more).The occurrence of sample A is as shown in table 1.
The voltage value of each single battery core in 1 sample A of table
| Battery number | 1 | 2 | 3 | 4 | 5 |
| Voltage | 2.11 | 2.07 | 2.03 | 2.06 | 2.09 |
| Battery number | 6 | 7 | 8 | 9 | 10 |
| Voltage | 2.07 | 2.12 | 1.99 | 2.07 | 2.04 |
| Battery number | 11 | 12 | 13 | 14 | 15 |
| Voltage | 2.11 | 2.03 | 2.06 | 2.08 | 1.98 |
It is tested, is taken to the sample in table 1 with the parametric test order carried in MATLAB (matrix labotstory) software
Significance is 0.05, and calculated result shows that the normal distribution-test result of sample A meets null hypothesis, that is, illustrates that sample A is full
Sufficient normal distribution.
Step 3): finding out the confidence interval of the normal distribution mean μ of sample A, and taking the lower limit of the confidence interval is standard, institute
State sample A lower than this standard single battery core be then performance decline single battery core.
The confidence interval that sample A is found out with the parameter command carried in MATLAB (matrix labotstory) software, passes through inspection
After proving that sample meets normal distribution, the confidence interval under significance 0.05 is found out, the confidence level that μ is calculated is
0.95 confidence interval is [2.038,20762], samples the lower limit of confidence interval 2.038 of the normal distribution mean μ of this A as mark
Standard, the single battery core lower than this standard then think that it is the single battery core of performance decline.
The data of each single battery core are compared, single battery core of the available voltage less than 2.038 is No. 12, No. 8
With No. 15, then it is assumed that three single battery cores are the single battery core of performance decline, it should be given with new single battery core it
Replacement.
Embodiments of the present invention above described embodiment only expresses, the description thereof is more specific and detailed, but can not
Therefore limitations on the scope of the patent of the present invention are interpreted as.It should be pointed out that for those of ordinary skill in the art,
Without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection model of the invention
It encloses.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (9)
1. a kind of method that lithium ion battery combines in series and parallel, which is characterized in that take connection type group in parallel again of first connecting
At battery module.
2. the method that lithium ion battery according to claim 1 combines in series and parallel, which is characterized in that the described method includes:
Multiple single battery cores are first subjected to series connection welding with nickel strap, form Li-ion batteries piles, are carried out by unit of Li-ion batteries piles
Postsearch screening is carried out sorting combination further according to demand principle in parallel, is welded parallel using nickel strap, final to form lithium ion battery mould
Block.
3. a kind of lithium ionic cell module, which is characterized in that the Li-ion batteries piles including multiple parallel connections, each lithium ion battery
Group is composed in series by multiple single battery cores.
4. a kind of method of the single battery core of performance decline in detection lithium ionic cell module, which is characterized in that including following step
It is rapid:
Step 1): carrying out proof discharge experiment to lithium ionic cell module, records each monomer electricity of lithium ionic cell module
Core is during discharge in the voltage at each time point of setting；
The voltage value at each the last one time point of single battery core recorded in experiment in step 1) is denoted as sample A by step 2),
Judge whether the sample A is in normal distribution, in this way, is then directly transferred to step 3)；Otherwise, nonlinear transformation is carried out to sample A,
It is set to be transferred to step 3) again in after normal distribution；
Step 3) finds out the confidence interval of the normal distribution mean μ of sample A, and taking the lower limit of the confidence interval is standard, the sample
This A is lower than the single battery core that the single battery core of this standard is then that performance declines.
5. the method that lithium ion battery according to claim 4 combines in series and parallel, which is characterized in that whether judgement sample A
In the method for normal distribution are as follows: calculate sample A coefficient skewness sc, when the coefficient skewness sc calculated between 0.5~0.5 it
Between when, it is believed that sample A be in normal distribution；Otherwise, it is believed that sample A is unsatisfactory for normal distribution.
6. the method that lithium ion battery according to claim 5 combines in series and parallel, which is characterized in that the coefficient skewness sc
Calculation formula it is as follows:
,
Wherein, sample A=(x1, x2... xi..., xN), N is the number of single battery core in battery module, namely records in sample A
Single battery core voltage value number；X is i-th of single battery core voltage value in sample A, i=1,2 ... N；It is respectively with σ (x)
The mean value and standard deviation of each voltage value in sample A, are calculated using following formula:
,
。
7. the method that lithium ion battery according to claim 6 combines in series and parallel, which is characterized in that whether judgement sample A
In the method for normal distribution are as follows: it is tested using the parametric test order carried in matrix labotstory software to sample A, if
It is 1 that significance, which carries out the result of normal distribution-test to sample A in the case where being α, then determines that sample A is unsatisfactory for normal state point
Cloth；α is the value in [0,1] range, is determined by width of confidence interval.
8. the method that lithium ion battery according to claim 7 combines in series and parallel, which is characterized in that carried out to sample A non-
The method of linear transformation are as follows: is carried out by exponentiation, open radical sign, inverse, index or takes logarithm for each voltage value.
9. the method that lithium ion battery according to claim 4 combines in series and parallel, which is characterized in that the step 3) packet
It includes: finding out the confidence interval of sample A with the parameter command carried in matrix labotstory software.
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Application publication date: 20190614 |