CN111554990A - Screening method for battery consistency and battery module - Google Patents
Screening method for battery consistency and battery module Download PDFInfo
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- CN111554990A CN111554990A CN202010404248.XA CN202010404248A CN111554990A CN 111554990 A CN111554990 A CN 111554990A CN 202010404248 A CN202010404248 A CN 202010404248A CN 111554990 A CN111554990 A CN 111554990A
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- 238000012216 screening Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000007599 discharging Methods 0.000 abstract description 17
- 230000000875 corresponding effect Effects 0.000 description 8
- 210000004027 cell Anatomy 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 210000004460 N cell Anatomy 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 235000020660 omega-3 fatty acid Nutrition 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
-
- 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
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a screening method for battery consistency, and relates to the technical field of batteries. The screening method for the consistency of the battery comprises the following steps: carrying out primary screening on the N batteries to obtain M primary qualified batteries; and taking the average value of the capacities of the M batteries under the preset discharge voltage as a reference capacity, and carrying out consistency grouping according to the voltage difference of the batteries under the reference capacity. In the discharging process of the battery, after the discharging voltage is smaller than a certain value, the difference performance of the battery is obvious, so that the discharging voltage smaller than the value is taken as the preset discharging voltage, the average value of the capacity of the M batteries corresponding to the preset discharging voltage is taken as a reference, the voltage corresponding to the reference is selected, and the consistency screening is carried out by the voltage difference corresponding to the reference, so that the accuracy of battery grouping is improved, and the consistency of the matched batteries is effectively improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a screening method for battery consistency and a battery module.
Background
With the popularization of electric vehicles, the service life of the electric vehicles becomes a focus of attention. One of the important reasons affecting the service life of electric vehicles, however, is the consistency of the batteries making up the battery system.
The single batteries have low energy, the single batteries need to form a module in a series-parallel connection mode in practical application, and the service life of the module can be seriously influenced due to the consistency problem of the batteries in the use process of the battery module. To improve consistency, battery manufacturers have adopted highly accurate automated equipment by reducing the number of raw material suppliers, and have been screened for voltage, capacity, and internal resistance prior to shipment to improve battery consistency. The method is low in cost and simple to operate, is a method for controlling the consistency of the batteries commonly used by the current battery factory, but the batteries screened by the method still have the condition that the batteries with consistency deviation are mixed with normal batteries, and after the batteries form a module, the deviation of one battery can influence the service life of the whole module.
Disclosure of Invention
The invention aims to provide a screening method for battery consistency, which is used for improving the accuracy of battery grouping and effectively improving the consistency of matched batteries.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for screening for cell consistency, comprising the steps of:
carrying out primary screening on the N batteries to obtain M primary qualified batteries;
and carrying out consistency grouping according to the voltage difference of the batteries under the reference capacity by taking the capacity average value of the M batteries under the preset discharge voltage as the reference capacity.
Optionally, the step of performing consistent grouping according to the voltage difference of the batteries at the reference capacity by using the average value of the capacities of the M batteries at the preset discharge voltage as the reference capacity includes:
calculating the reference capacity, and calculating the voltage difference of the battery at the reference capacity;
and grouping the consistency of the voltage difference according to the set gear.
Optionally, the method for calculating the reference capacity includes:
performing discharge test on the M batteries to obtain voltage/capacity data of the M batteries during discharge;
acquiring the capacity of a single battery under the preset discharge voltage;
and calculating the average value of the capacities of the M batteries under the preset discharge voltage according to the capacity of the single battery.
Optionally, the current value for the discharge test of the M batteries is 1C.
Optionally, the calculating method of the voltage difference includes:
taking the average value of the capacities of the M batteries as the reference capacity, and acquiring the voltage value of a single battery corresponding to the reference capacity;
calculating a voltage average value of the M cells from the voltage value of the single cell, and the voltage difference between the voltage value of the single cell and the voltage average value of the M cells.
Optionally, the set gear comprises 0.0V to 0.3V, 0.3V to 0.5V, 0.5V to 1.0V, and 1.0V to 1.5V.
Optionally, the preset discharge voltage is 1.5V to 2.5V.
Optionally, the step of preliminary screening comprises:
screening voltage consistency;
and (5) screening the internal resistance consistency.
Optionally, the screening of the voltage consistency is performed after the battery is kept still for 24 to 72 hours in an environment with a temperature of 30 to 60 ℃ when the voltage of the battery is 30 to 80% of the SOC.
Another object of the present invention is to provide a battery module, which can improve the service life and safety of the battery module.
In order to achieve the purpose, the invention adopts the following technical scheme:
a battery module is characterized in that a set number of batteries with the same voltage difference gear under the standard capacity are screened by the screening method for battery consistency.
The invention has the beneficial effects that:
according to the screening method for battery consistency, M primary qualified batteries are obtained after N batteries are primarily screened, and then consistency grouping is performed according to the voltage difference of the batteries under the reference capacity by taking the capacity average value of the M batteries under the preset discharge voltage as the reference capacity. In the discharging process of the battery, after the discharging voltage is smaller than a certain value, the difference performance of the battery is obvious, so that the discharging voltage smaller than the value is taken as the preset discharging voltage, the average value of the capacity of the M batteries corresponding to the preset discharging voltage is taken as a reference, the voltage corresponding to the reference is selected, and the consistency screening is carried out by the voltage difference corresponding to the reference, so that the accuracy of battery grouping is improved, and the consistency of the matched batteries is effectively improved. The screening method for the consistency of the batteries solves the problem of the prior art that the circulation attenuation is accelerated due to the self difference of the batteries after the batteries are graded, and the scheme is simple in actual operation, strong in practicability and capable of being popularized on a production line.
According to the battery module, the batteries with the same voltage difference and gears under the reference capacity are grouped, the performance consistency of the batteries is high, and the service life and the safety of the battery module are improved.
Drawings
Fig. 1 is a simulated distribution diagram of voltage/capacity variation of a 10pcs battery in the same gear during discharging after the battery is screened for consistency of voltage, capacity and internal resistance according to an embodiment of the present invention;
fig. 2 is an enlarged view of simulated distribution of voltage/capacity change of a 10pcs battery in the same gear after the battery is screened for consistency of voltage, capacity and internal resistance, when the discharge voltage is smaller than a certain value, according to an embodiment of the present invention;
FIG. 3 is a first schematic flow chart of a method for screening battery consistency according to an embodiment of the present invention;
FIG. 4 is a second schematic flow chart of a method for screening battery consistency according to an embodiment of the present invention;
fig. 5 is a simulation distribution diagram of cycle verification of consistency of the battery module according to the embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly and encompass, for example, both fixed and removable connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in direct contact with the second feature but being in contact with the second feature by another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Fig. 1 and 2 are voltage/capacity variation simulation distribution diagrams drawn by randomly selecting 10pcs of batteries from ternary lithium batteries of the same gear (capacity difference: 10mAh, internal resistance difference: 2m omega, voltage difference: 3mV) to discharge to 1.5V after the batteries are screened for consistency of voltage, capacity and internal resistance. As can be seen from fig. 1, when the discharge voltage is less than 3.4V, the differential performance of the battery is more obvious. FIG. 2 is an enlarged view of voltage-capacity variation simulation distribution after the discharge voltage is less than 3.4V, and it can be clearly seen that the discharge voltage varies between 3.4V and 1.5V.
Based on the above characteristics of the battery, as shown in fig. 3 and 4, the present embodiment provides a screening method for battery consistency, including the following steps:
s1, carrying out primary screening on the N batteries to obtain M primary qualified batteries;
the preliminary screening provided by this embodiment includes:
s11, screening voltage consistency;
optionally, the screening of the voltage consistency is performed after the battery is kept still for 24 to 72 hours in an environment with a temperature of 30 to 60 ℃ when the voltage is 30 to 80% of the SOC.
After the assembly and liquid injection of the battery are finished, the battery is charged to 30-80% SOC, and is kept stand for 24-72 h in the environment with the temperature of 30-60 ℃, so that the electrode plate is fully soaked by the electrolyte, and the stability of the electrochemical performance of the battery is ensured.
Optionally, a screening criterion for voltage uniformity: the voltage difference is in the range of 0 mV-20 mV. In this embodiment, (N-A) cells having A voltage of 3.59V + -0.01V among the N cells are screened.
And S12, screening internal resistance consistency.
Optionally, the screening criterion of the internal resistance consistency: the internal resistance difference value is within the range of 0m omega-3 m omega. In this embodiment, (N-A) batteries with the same voltage are screened for internal resistance uniformity, and (N-A-B) batteries with an internal resistance of 3.2M Ω ± 1.5M Ω are screened to obtain M primary qualified batteries, where M is (N-A-B).
It should be noted that the order of the screening of the voltage consistency and the screening of the internal resistance consistency is not limited, and the screening can be performed simultaneously without affecting the screening result.
And S2, taking the average value of the capacities of the M batteries under the preset discharge voltage as a reference capacity, and carrying out consistency grouping according to the voltage difference of the batteries under the reference capacity.
Optionally, the step specifically includes:
s21, calculating a reference capacity, and calculating the voltage difference of the battery under the reference capacity;
optionally, the reference capacity is calculated by:
s211, performing discharge test on the M batteries to obtain voltage/capacity data of the M batteries during discharge;
alternatively, the current value for the discharge test of the M cells is 1C.
In this embodiment, as shown in fig. 1, after the difference in the discharge test process of the M primary qualified batteries is analyzed, the difference of the batteries is more obvious after the discharge voltage is less than 3.4V. In order to further improve the uniformity of the batteries, the batteries need to be further screened according to the differences to improve the uniformity of the batteries.
S212, acquiring the capacity of a single battery under a preset discharge voltage;
optionally, the preset discharge voltage is 1.5V to 2.5V. As can be seen from fig. 2, when the discharge voltage is 1.5V to 2.5V, the capacity of the single battery does not change much, and therefore the reference capacity of the voltage can be calculated within this voltage range. In the present embodiment, the preset discharge voltage is 1.5V. In this embodiment, 1.5V is the cutoff voltage of a single battery, and the discharge voltage of the single battery is 1.5V at the lowest. In other embodiments, the preset discharge voltage may be set according to an actual discharge minimum operating voltage of the single battery.
And S213, calculating the average value of the capacities of the M batteries under the preset discharge voltage according to the capacity of the single battery.
In the present embodiment, the average value of the capacities of M batteries is calculated from the capacity of a single battery when the discharge voltage is 1.5V.
Optionally, the voltage difference is calculated by:
s214, taking the average value of the capacities of the M batteries as a reference capacity, and acquiring a voltage value of a single battery corresponding to the reference capacity;
and S215, calculating the average value of the voltages of the M batteries according to the voltage value of the single battery, and the voltage difference between the voltage value of the single battery and the average value of the voltages of the M batteries.
And S22, grouping the consistency of the voltage difference according to the set gear.
Optionally, the set gears include 0.0V to 0.3V, 0.3V to 0.5V, 0.5V to 1.0V, and 1.0V to 1.5V. In the present embodiment, the voltage difference is divided into 4 steps. And matching the batteries with the same gear. A separate group for discharging voltages less than 1.5V at the reference capacity.
The screening method for battery consistency provided by this embodiment obtains M primary qualified batteries after performing primary screening on N batteries, and then performs consistency grouping according to the voltage difference of the batteries under the reference capacity by using the capacity average value of the M batteries under the preset discharge voltage as the reference capacity. In the discharging process of the battery, after the discharging voltage is smaller than a certain value, the difference performance of the battery is obvious, so that the discharging voltage smaller than the value is taken as the preset discharging voltage, the average value of the capacity of the M batteries corresponding to the preset discharging voltage is taken as a reference, the voltage corresponding to the reference is selected, and the consistency screening is carried out by the voltage difference corresponding to the reference, so that the accuracy of battery grouping is improved, and the consistency of the matched batteries is effectively improved. The screening method for the consistency of the batteries solves the problem of the prior art that the circulation attenuation is accelerated due to the self difference of the batteries after the batteries are graded, and the scheme is simple in actual operation, strong in practicability and capable of being popularized on a production line.
According to the batteries screened by the screening method for battery consistency, the batteries with the voltage differences of 0.0V-0.3V, 0.3V-0.5V, 0.5V-1.0V and 1.0V-1.5V are randomly selected to form four 5S1P modules respectively, cycle verification is carried out, the voltage difference of 4 groups of batteries at 100 cycles is shown in figure 5, and the initial voltage is positively correlated with the voltage difference at 100 cycles.
The embodiment also provides a battery module, and the battery modules are grouped by the set number of the batteries with the same voltage difference gears under the standard capacity screened by adopting the screening method for battery consistency.
The battery module that this embodiment provided adopts the battery that the voltage difference gear is the same under benchmark capacity to be in groups, and the performance uniformity of battery is high, has improved battery module's life and security.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (10)
1. A screening method for battery consistency is characterized by comprising the following steps:
carrying out primary screening on the N batteries to obtain M primary qualified batteries;
and carrying out consistency grouping according to the voltage difference of the batteries under the reference capacity by taking the capacity average value of the M batteries under the preset discharge voltage as the reference capacity.
2. The method for screening consistency of batteries according to claim 1, wherein the step of performing consistency grouping according to the voltage difference of the batteries at a reference capacity by taking the average value of the capacities of the M batteries at a preset discharge voltage as the reference capacity comprises:
calculating the reference capacity, and calculating the voltage difference of the battery at the reference capacity;
and grouping the consistency of the voltage difference according to the set gear.
3. The method for screening battery consistency according to claim 2, wherein the reference capacity is calculated by:
performing discharge test on the M batteries to obtain voltage/capacity data of the M batteries during discharge;
acquiring the capacity of a single battery under the preset discharge voltage;
and calculating the average value of the capacities of the M batteries under the preset discharge voltage according to the capacity of the single battery.
4. The method for screening battery consistency according to claim 3, wherein the current value for the discharge test of the M batteries is 1C.
5. The method for screening battery consistency according to claim 3, wherein the voltage difference is calculated by:
taking the average value of the capacities of the M batteries as the reference capacity, and acquiring the voltage value of a single battery corresponding to the reference capacity;
calculating a voltage average value of the M cells from the voltage value of the single cell, and the voltage difference between the voltage value of the single cell and the voltage average value of the M cells.
6. The method for screening battery consistency according to claim 2, wherein the set steps include 0.0V to 0.3V, 0.3V to 0.5V, 0.5V to 1.0V, and 1.0V to 1.5V.
7. The method for screening battery consistency according to claim 1, wherein the preset discharge voltage is 1.5V to 2.5V.
8. The method for screening battery consistency according to claim 1, wherein the preliminary screening step comprises:
screening voltage consistency;
and (5) screening the internal resistance consistency.
9. The method of claim 8, wherein the screening of the consistency of the voltage is performed after the voltage of the battery is 30% SOC to 80% SOC and the battery is left to stand at 30 ℃ to 60 ℃ for 24 hours to 72 hours.
10. A battery module, characterized in that a set number of batteries with the same voltage difference step at the reference capacity are grouped by the battery consistency screening method according to any one of claims 1 to 9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113013498A (en) * | 2021-02-22 | 2021-06-22 | 天能电池集团股份有限公司 | Method for judging lead storage battery assembly quality |
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| CN110707382A (en) * | 2019-10-18 | 2020-01-17 | 瑞浦能源有限公司 | Lithium ion battery matching method |
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- 2020-05-13 CN CN202010404248.XA patent/CN111554990A/en active Pending
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| CN103901350A (en) * | 2014-03-13 | 2014-07-02 | 奇瑞汽车股份有限公司 | Worn-out power battery secondary use screening method |
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