CN111929595A - Method for measuring electric quantity state of lithium iron phosphate battery pack through hybrid series connection - Google Patents
Method for measuring electric quantity state of lithium iron phosphate battery pack through hybrid series connection Download PDFInfo
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- CN111929595A CN111929595A CN202010519667.8A CN202010519667A CN111929595A CN 111929595 A CN111929595 A CN 111929595A CN 202010519667 A CN202010519667 A CN 202010519667A CN 111929595 A CN111929595 A CN 111929595A
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- Prior art keywords
- electric quantity
- iron phosphate
- battery
- battery pack
- lithium
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- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 28
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910001416 lithium ion Inorganic materials 0.000 claims abstract description 8
- 229910052744 lithium Inorganic materials 0.000 claims description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- PFYQFCKUASLJLL-UHFFFAOYSA-N [Co].[Ni].[Li] Chemical compound [Co].[Ni].[Li] PFYQFCKUASLJLL-UHFFFAOYSA-N 0.000 claims description 2
- QTHKJEYUQSLYTH-UHFFFAOYSA-N [Co]=O.[Ni].[Li] Chemical compound [Co]=O.[Ni].[Li] QTHKJEYUQSLYTH-UHFFFAOYSA-N 0.000 claims description 2
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 claims description 2
- BDKWOJYFHXPPPT-UHFFFAOYSA-N lithium dioxido(dioxo)manganese nickel(2+) Chemical compound [Mn](=O)(=O)([O-])[O-].[Ni+2].[Li+] BDKWOJYFHXPPPT-UHFFFAOYSA-N 0.000 claims description 2
- URIIGZKXFBNRAU-UHFFFAOYSA-N lithium;oxonickel Chemical compound [Li].[Ni]=O URIIGZKXFBNRAU-UHFFFAOYSA-N 0.000 claims description 2
- 239000007774 positive electrode material Substances 0.000 claims description 2
- SOXUFMZTHZXOGC-UHFFFAOYSA-N [Li].[Mn].[Co].[Ni] Chemical compound [Li].[Mn].[Co].[Ni] SOXUFMZTHZXOGC-UHFFFAOYSA-N 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000178 monomer Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical compound [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 description 1
- KFDQGLPGKXUTMZ-UHFFFAOYSA-N [Mn].[Co].[Ni] Chemical compound [Mn].[Co].[Ni] KFDQGLPGKXUTMZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Images
Classifications
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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
- 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]
- G01R31/3644—Constructional arrangements
- G01R31/3646—Constructional arrangements for indicating electrical conditions or variables, e.g. visual or audible indicators
-
- 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
Abstract
The invention discloses a method for measuring the electric quantity state of a lithium iron phosphate battery pack through hybrid series connection, which is summarized as follows: (1) a group of indicating lithium ion batteries are connected in series on the basis of the lithium iron phosphate battery pack, and the voltage of the indicating batteries is obviously changed along with the state of electric quantity; (2) determining a state of charge indicative of the battery by measuring a voltage indicative of the battery; (3) and reflecting the electric quantity state of the main body lithium iron phosphate battery pack by indicating the electric quantity state of the battery. The hybrid series connection method has the advantages of accurate measurement result, low cost, basically no influence on the performance of the main battery pack and the like, and is suitable for measuring and displaying the electric quantity state of the lithium iron phosphate battery pack in some occasions.
Description
Technical Field
The invention relates to the field of lithium ion batteries, in particular to a method for measuring the electric quantity state of a lithium iron phosphate battery and a battery pack.
Background
In the existing lithium ion battery, the lithium iron phosphate battery is widely applied due to the characteristics of good safety, good cycle performance, flat charging and discharging voltage curve, cheap and environment-friendly raw materials and the like; however, the charging and discharging voltage curve of the lithium iron phosphate battery is relatively flat, and the correlation between the voltage and the electric quantity state is not obvious, so that the residual electric quantity state of the lithium iron phosphate battery is difficult to accurately determine by using a voltage measuring mode; in order to accurately display the electric quantity state of the lithium iron phosphate battery, the electric quantity state of the lithium iron phosphate battery is generally measured and displayed by using a current integration method or various algorithms in the industry, but the current integration method is high in cost, and the result obtained by using the algorithms is not ideal in accuracy.
Disclosure of Invention
The invention mainly aims to provide a method for accurately measuring the electric quantity state of a lithium iron phosphate battery pack at low cost, and the method has the characteristics of low cost, accurate measurement result, simplicity, convenience and feasibility.
In order to achieve the above object, the present invention provides the following technical method, which is characterized in that:
1. the method is realized by connecting the indicating battery on the lithium iron phosphate battery in series;
2. the method comprises the steps of reflecting the electric quantity state of an indication battery by measuring the voltage of the indication battery so as to reflect the electric quantity state of a lithium iron phosphate battery;
3. the indicating battery in the method is a lithium ion battery with voltage changing obviously along with the state of electric quantity, and the state of electric quantity of the battery can be accurately reflected by measuring the voltage;
4. the lithium ion battery according to claim 3, wherein the positive electrode material of the lithium ion battery capable of accurately reflecting the state of charge of the battery by measuring the voltage is one or more of lithium cobaltate, lithium manganate, lithium nickel cobalt manganate (ternary material), lithium nickel cobalt aluminate, lithium nickel manganate, lithium nickel cobalt oxide, and lithium nickel oxide;
5. the indicating battery is also a part of the battery pack, and is used for indicating electric quantity and storing electric energy;
6. the state of charge, also referred to as state of charge, remaining capacity, SOC, etc., as described in the present method is typically expressed in percentage or scale.
In order to ensure the normal performance of the measured lithium iron phosphate battery pack, parameters such as the capacity of the battery, the large-current discharge capacity, the residual capacity after circulation and the like are generally equal to or higher than the measured lithium iron phosphate battery pack.
Compared with the existing measuring method, the method has the beneficial effects that:
1. the cost is low, and the realization is easy;
2. the indication battery pack not only serves for indicating the electric quantity state, but also provides the energy storage capacity, and generally has no negative influence on parameters such as energy density and power density of the whole battery pack.
Drawings
FIG. 1 is a schematic diagram of a structure of the present invention
Detailed Description
Example 1:
manufacturing and state of charge measurement of 36V10Ah lithium battery pack by using the method
1. Manufacturing a battery main body part: 5Ah of lithium iron phosphate battery monomer is used, and a combination mode of 2-in-10 series is adopted to combine a lithium iron phosphate battery pack with the nominal voltage of 32.3V and the nominal capacity of 10 Ah;
2. manufacturing an indication battery part: forming an indicating battery pack with nominal voltage of 3.7V and nominal capacity of 13.2Ah by using a nickel-cobalt-manganese ternary material battery with 2.2Ah and adopting a 6-in-1-string combination mode;
3. adjusting the electric quantity state of the indicating battery pack to make the electric quantity of the indicating battery pack consistent with the electric quantity of the main battery pack or slightly higher than the electric quantity of the main battery pack;
4. the main part and the indicating part of the battery pack are connected in series to obtain a hybrid series battery with the nominal voltage of 36V and the nominal capacity of 10 Ah;
5. connecting a measuring line of the voltage and electricity meter to a positive electrode and a negative electrode of the indicating battery, and adjusting the corresponding proportion to enable the relation between the electricity quantity display and the voltage to be proper;
6. mounting a suitable battery management system or protective plate on the battery pack;
7. after the battery pack is put into use, the electric quantity state of the battery pack can be judged according to the display of the voltage and electricity meter.
Example 2
Manufacturing and state of charge measurement of 12V20Ah lithium battery pack by using the method
1. Manufacturing a battery main body part: 5Ah of lithium iron phosphate battery monomer is used, and a 4-parallel 3-series combination mode is adopted to combine a lithium iron phosphate battery pack with the nominal voltage of 9.6V and the nominal capacity of 20 Ah;
2. manufacturing an indication battery part: a ternary-lithium titanate material battery monomer is used, the nominal voltage is 2.4V, and the nominal capacity is 20 Ah;
3. adjusting the electric quantity state of the indication battery pack to make the electric quantity of the indication battery pack consistent with the electric quantity of the main battery pack;
4. the main part and the indicating part of the battery pack are connected in series to obtain a hybrid series battery with the nominal voltage of 12V and the nominal capacity of 20 Ah;
5. connecting a measuring line of a voltage electricity meter to a positive electrode and a negative electrode of the battery pack, and adjusting the corresponding proportion to enable the relation between the electricity quantity display and the voltage to be proper;
6. mounting a suitable battery management system or protective plate on the battery pack;
7. after the battery pack is put into use, the electric quantity state of the battery pack can be judged according to the display of the voltage and electricity meter.
The above description is only one of the embodiments of the present invention, but the scope of the present invention is not limited thereto, and the technical method and concept of the present invention can be equally replaced or changed, including but not limited to the change of the electric quantity display mode, the change of the number of the battery strings connected in parallel, and the change of the corresponding relationship between the electric quantity and the voltage, and the like, within the technical scope of the present invention.
Claims (6)
1. The method is characterized in that the method is realized by connecting indication batteries in series on the lithium iron phosphate batteries.
2. A method for measuring the electric quantity state of a lithium iron phosphate battery pack through hybrid series connection is characterized in that the electric quantity state of an indication battery is reflected by measuring the voltage of the indication battery, and then the electric quantity state of the lithium iron phosphate battery is reflected.
3. The method for measuring the electric quantity state of the lithium iron phosphate battery pack through hybrid series connection is characterized in that the indicating battery in the method is a lithium ion battery with voltage which changes obviously along with the residual electric quantity and can accurately reflect the electric quantity state of the battery through measuring the voltage.
4. The method for measuring the electric quantity state of the lithium iron phosphate battery pack through hybrid series connection is characterized in that in the method, the positive electrode material of the lithium ion battery for indication can be one or more of lithium cobaltate, lithium manganate, lithium nickel cobalt manganese (ternary material), lithium nickel cobalt aluminate, lithium nickel manganate, lithium nickel cobalt oxide and lithium nickel oxide.
5. The method for measuring the electric quantity state of the lithium iron phosphate battery pack through hybrid series connection is characterized in that an indication battery is also a part of the battery pack and is used for displaying the electric quantity and storing electric energy.
6. A method for measuring the state of charge, also known as state of charge, remaining capacity, SOC, etc., of a lithium iron phosphate battery by hybrid tandem, is generally expressed in percentage or ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010519667.8A CN111929595A (en) | 2020-06-09 | 2020-06-09 | Method for measuring electric quantity state of lithium iron phosphate battery pack through hybrid series connection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010519667.8A CN111929595A (en) | 2020-06-09 | 2020-06-09 | Method for measuring electric quantity state of lithium iron phosphate battery pack through hybrid series connection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111929595A true CN111929595A (en) | 2020-11-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010519667.8A Pending CN111929595A (en) | 2020-06-09 | 2020-06-09 | Method for measuring electric quantity state of lithium iron phosphate battery pack through hybrid series connection |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114035068A (en) * | 2021-10-26 | 2022-02-11 | 上海兰钧新能源科技有限公司 | Hybrid battery system and residual capacity estimation method thereof |
| EP4027444A1 (en) * | 2021-01-08 | 2022-07-13 | Nio Technology (Anhui) Co., Ltd | Battery pack, method and vehicle |
| WO2022183459A1 (en) * | 2021-03-04 | 2022-09-09 | 宁德时代新能源科技股份有限公司 | Method and apparatus for estimating soc of battery pack, and battery management system |
| WO2022257556A1 (en) * | 2021-06-07 | 2022-12-15 | 蜂巢能源科技股份有限公司 | Apparatus and method for determining state of charge of battery pack |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2598158Y (en) * | 2003-01-27 | 2004-01-07 | 国营建中化工总公司 | Lithium primary battery with residual capacity display device |
| CN102890243A (en) * | 2011-07-20 | 2013-01-23 | 海洋王照明科技股份有限公司 | Measuring circuit and measuring device for battery capacity as well as battery capacity meter |
| CN104204832A (en) * | 2012-03-29 | 2014-12-10 | 罗伯特·博世有限公司 | Method for connecting battery cells in a battery, battery and monitoring device |
-
2020
- 2020-06-09 CN CN202010519667.8A patent/CN111929595A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2598158Y (en) * | 2003-01-27 | 2004-01-07 | 国营建中化工总公司 | Lithium primary battery with residual capacity display device |
| CN102890243A (en) * | 2011-07-20 | 2013-01-23 | 海洋王照明科技股份有限公司 | Measuring circuit and measuring device for battery capacity as well as battery capacity meter |
| CN104204832A (en) * | 2012-03-29 | 2014-12-10 | 罗伯特·博世有限公司 | Method for connecting battery cells in a battery, battery and monitoring device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4027444A1 (en) * | 2021-01-08 | 2022-07-13 | Nio Technology (Anhui) Co., Ltd | Battery pack, method and vehicle |
| WO2022183459A1 (en) * | 2021-03-04 | 2022-09-09 | 宁德时代新能源科技股份有限公司 | Method and apparatus for estimating soc of battery pack, and battery management system |
| WO2022257556A1 (en) * | 2021-06-07 | 2022-12-15 | 蜂巢能源科技股份有限公司 | Apparatus and method for determining state of charge of battery pack |
| CN114035068A (en) * | 2021-10-26 | 2022-02-11 | 上海兰钧新能源科技有限公司 | Hybrid battery system and residual capacity estimation method thereof |
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