CN106785122B - Lithium ion battery matching method for smart home - Google Patents
Lithium ion battery matching method for smart home Download PDFInfo
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- CN106785122B CN106785122B CN201710012327.4A CN201710012327A CN106785122B CN 106785122 B CN106785122 B CN 106785122B CN 201710012327 A CN201710012327 A CN 201710012327A CN 106785122 B CN106785122 B CN 106785122B
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- lithium ion
- ion batteries
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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
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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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
- H01M10/04—Construction or manufacture in general
-
- 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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- 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
- H01M10/448—End of discharge regulating measures
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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
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a lithium ion battery matching method for smart home, which simulates the use condition of a battery in the smart home through pulse discharge under two different states of full charge and discharge of the battery, simulates normal-temperature long-term storage through high-temperature short-term storage, and finally matches the batteries with consistent capacity performance and storage attenuation performance under various conditions through a cycle test, so that the whole uniformity of a battery pack can be ensured and the service life of the battery pack is prolonged even if the battery pack is attenuated in the use process.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a matching method of lithium ion batteries for smart homes.
Background
The intelligent home (English: smart home, home automation) is characterized in that a home is used as a platform, facilities related to home life are integrated by utilizing a comprehensive wiring technology, a network communication technology, a safety precaution technology, an automatic control technology and an audio and video technology, a high-efficiency management system of home facilities and home schedule affairs is constructed, home safety, convenience, comfortableness and artistry are improved, and an environment-friendly and energy-saving living environment is realized.
The existing intelligent home system generally needs to be communicated with an external power supply to work. In many cases, people want to use some functions of the smart home system, such as data reading, signal transceiving, etc., even without an external power source. Therefore, a lithium ion battery needs to be built in the smart home, so that a necessary power supply is provided for basic functions of the smart home without an external power supply, such as data storage, signal transceiving and the like. If the lithium ion batteries in the lithium ion battery pack have capacity differences, the lithium ion batteries with the capacity lower than the average level are overcharged or overdischarged, so that the service life and the safety performance of the lithium ion batteries are seriously influenced; in the prior art, lithium ion battery matching is performed according to the capacity of a lithium ion battery in a factory stage, the problem that the matching of the lithium ion battery is not matched due to capacity attenuation difference caused by long-time use or storage is not considered too much, a built-in lithium ion battery in an intelligent home can be subjected to long-time storage or work, no matching technology aiming at the intelligent home is found at present, and if the lithium ion battery is matched according to storage time, the production cycle of the battery is increased, and the cost is increased.
In view of the above, there is an urgent need to design a new lithium ion battery grouping method for an intelligent home system so as to overcome the above-mentioned defects of the existing lithium ion batteries.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a lithium ion battery matching method for smart home. The definition of grouping in the present invention means that batteries meeting the requirements are grouped into the same group. When the battery pack is assembled at a later stage, the same set of cells is used.
The specific scheme is as follows:
a matching method of lithium ion batteries for smart home,
1) selecting a group of lithium ion batteries, charging to cut-off voltage, wherein the cut-off voltage is 4.2-4.5V, measuring the capacities of the lithium ion batteries, and sequencing according to the capacities;
2) matching lithium ion batteries with capacity difference within a preset range A, wherein the preset range A is less than or equal to 10%;
3) placing the lithium ion batteries for 10 to 20 hours at the temperature of between 40 and 70 ℃, measuring the capacity of the lithium ion batteries, eliminating the lithium ion batteries with the SOC reduction range higher than 15 percent, sequencing the lithium ion batteries in the same group according to the capacity, and regrouping the lithium ion batteries with the capacity difference within a preset range B, wherein the preset range B is smaller than the preset range A;
4) carrying out pulse discharge on the lithium ion battery at the frequency of 10-100Hz, wherein the pulse amplitude is 0.01-0.5C until the SOC of the lithium ion battery reaches a preset value, and the preset value is 50-70% of the SOC;
5) placing the lithium ion batteries for 10 to 20 hours at the temperature of between 40 and 70 ℃, measuring the capacity of the lithium ion batteries, eliminating the lithium ion batteries with the SOC reduction range higher than 15 percent, sequencing the lithium ion batteries in the same group according to the capacity, and regrouping the lithium ion batteries with the capacity difference within a preset range C, wherein the preset range C is smaller than the preset range B;
6) discharging at constant current until cut-off voltage is 2.6-2.8V and current is 0.05-0.1C;
7) placing the lithium ion batteries for 10 to 20 hours at the temperature of between 40 and 70 ℃, measuring the capacity of the lithium ion batteries, eliminating the lithium ion batteries with the SOC reduction range higher than 15 percent, sequencing the lithium ion batteries in the same group according to the capacity, and regrouping the lithium ion batteries with the capacity difference within a preset range D, wherein the preset range D is smaller than a preset range C;
9) charging to cut-off voltage with constant current of 0.1-0.5C, wherein the cut-off voltage is 4.2-4.5V;
10) the constant voltage charging is carried out by cut-off voltage until the charging current is less than 0.01C;
11) and repeating the steps 1-3 of the steps 2-10 to finish the final matching.
Further, the cut-off voltage of the step 1 is 4.2-4.3V
Further, predetermined range A is 8%, predetermined range B is 7%, predetermined range C is 6%, and predetermined range D is 5%
Further, the cut-off voltage of the step 6 is 2.7V;
further, repeat step 2-10 step 2 times.
Further wherein the temperature in step 1), 5) and/or 7) is 50-60 degrees celsius.
The invention has the following beneficial effects:
(1) the storage performance test is respectively carried out under two different states of full charge and discharge of the battery, so that the uniformity of the performance of the battery at each stage is ensured;
(2) the use condition of the battery in the smart home is simulated through pulse discharge, and the storage performance test is measured in the state.
(3) And the high-temperature short-term storage is adopted to simulate the normal-temperature long-term storage, so that the time required by matching is shortened.
(4) Through the cycle test and the multiple matching, not only the capacity performance is considered, but also the battery matching with consistent storage attenuation performance under various conditions is considered, even if the battery is attenuated in the use process, the uniformity of the battery in the battery pack can be ensured, and the service life of the battery pack is prolonged.
Detailed Description
The present invention will be described in more detail below with reference to specific examples, but the scope of the present invention is not limited to these examples.
Example 1
1) Selecting 1000 lithium ion batteries, charging to cut-off voltage, wherein the cut-off voltage is 4.5V, measuring the capacity of the lithium ion batteries, and sequencing according to the capacity;
2) matching lithium ion batteries with capacity difference within a preset range A, wherein the preset range A is equal to 10%;
3) placing the lithium ion batteries at the temperature of 70 ℃ for 10 hours, measuring the capacity of the lithium ion batteries, eliminating the lithium ion batteries with the SOC reduction range higher than 15%, sequencing the lithium ion batteries in the same group according to the capacity, and grouping the lithium ion batteries with the capacity difference within a preset range B again, wherein the preset range B is 8%;
4) carrying out pulse discharge on the lithium ion battery at the frequency of 10Hz, wherein the pulse amplitude is 0.5C until the SOC of the lithium ion battery reaches a preset value, and the preset value is 50% of the SOC;
5) placing the lithium ion batteries at the temperature of 70 ℃ for 10 hours, measuring the capacity of the lithium ion batteries, eliminating the lithium ion batteries with the SOC reduction range higher than 15%, sequencing the lithium ion batteries in the same group according to the capacity, and grouping the lithium ion batteries with the capacity difference within a preset range C again, wherein the preset range C is 7%;
6) discharging at constant current until the cut-off voltage is 2.6V and the current is 0.1C;
7) placing the lithium ion batteries at the temperature of 70 ℃ for 10-20 hours, measuring the capacity of the lithium ion batteries, eliminating the lithium ion batteries with the SOC reduction range higher than 15%, sequencing the lithium ion batteries in the same group according to the capacity, and grouping the lithium ion batteries with the capacity difference within a preset range D again, wherein the preset range D is 6%;
9) charging to cut-off voltage with 0.5C constant current, wherein the cut-off voltage is 4.5V;
10) the constant voltage charging is carried out by cut-off voltage until the charging current is less than 0.01C;
11) and repeating the step 1 of the step 2-10 for times to finish the final matching.
Example 2
1) Selecting 1000 lithium ion batteries, charging the lithium ion batteries to cut-off voltage, wherein the cut-off voltage is 4.2V, measuring the capacities of the lithium ion batteries, and sequencing the lithium ion batteries according to the capacities;
2) matching lithium ion batteries with capacity difference within a preset range A, wherein the preset range A is less than or equal to 8%;
3) placing the lithium ion batteries for 20 hours at the temperature of 40 ℃, measuring the capacity of the lithium ion batteries, eliminating the lithium ion batteries with the SOC reduction range higher than 15%, sequencing the lithium ion batteries in the same group according to the capacity, and grouping the lithium ion batteries with the capacity difference within a preset range B again, wherein the preset range B is 7%;
4) carrying out pulse discharge on the lithium ion battery at the frequency of 100Hz, wherein the pulse amplitude is 0.01C until the SOC of the lithium ion battery reaches a preset value, and the preset value is 70% of the SOC;
5) placing the lithium ion batteries for 20 hours at the temperature of 40 ℃, measuring the capacity of the lithium ion batteries, eliminating the lithium ion batteries with the SOC reduction range higher than 15%, sequencing the lithium ion batteries in the same group according to the capacity, and grouping the lithium ion batteries with the capacity difference within a preset range C again, wherein the preset range C is 6%;
6) discharging at constant current until the cut-off voltage is 2.8V and the current is 0.05C;
7) placing the lithium ion batteries for 20 hours at the temperature of 40 ℃, measuring the capacity of the lithium ion batteries, eliminating the lithium ion batteries with the SOC reduction range higher than 15%, sequencing the lithium ion batteries in the same group according to the capacity, and grouping the lithium ion batteries with the capacity difference within a preset range D again, wherein the preset range D is 5%;
9) charging to cut-off voltage with 0.1C constant current, wherein the cut-off voltage is 4.2V;
10) the constant voltage charging is carried out by cut-off voltage until the charging current is less than 0.01C;
11) and repeating the steps 2-10 for 3 times to finish the final matching.
Comparative example 1;
selecting 1000 lithium ion batteries, performing charge-discharge cycle for three times, charging to cut-off voltage, wherein the cut-off voltage is 4.2V, measuring the capacities of the lithium ion batteries, and sequencing according to the capacities;
2) matching lithium ion batteries with capacity difference within a preset range A, wherein the preset range A is less than or equal to 5%;
and testing the uniformity of the battery pack, selecting 10 batteries in the same battery pack after group matching to form the battery pack, performing charge-discharge cycle 10 times and cycle 300 times after storing for 200 hours, detecting the single batteries in the battery pack, and searching the number of the batteries with the capacity attenuation exceeding 70%.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (6)
1. A matching method of lithium ion batteries for smart home,
1) selecting a group of lithium ion batteries, charging to cut-off voltage, wherein the cut-off voltage is 4.2-4.5V, measuring the capacities of the lithium ion batteries, and sequencing according to the capacities;
2) matching lithium ion batteries with capacity difference within a preset range A, wherein the preset range A is less than or equal to 10%;
3) placing the lithium ion batteries for 10 to 20 hours at the temperature of between 40 and 70 ℃, measuring the capacity of the lithium ion batteries, eliminating the lithium ion batteries with the SOC reduction range higher than 15 percent, sequencing the lithium ion batteries in the same group according to the capacity, and regrouping the lithium ion batteries with the capacity difference within a preset range B, wherein the preset range B is smaller than the preset range A;
4) carrying out pulse discharge on the lithium ion battery at the frequency of 10-100Hz, wherein the pulse amplitude is 0.01-0.5C until the SOC of the lithium ion battery reaches a preset value, and the preset value is 50-70% of the SOC;
5) placing the lithium ion batteries for 10 to 20 hours at the temperature of between 40 and 70 ℃, measuring the capacity of the lithium ion batteries, eliminating the lithium ion batteries with the SOC reduction range higher than 15 percent, sequencing the lithium ion batteries in the same group according to the capacity, and regrouping the lithium ion batteries with the capacity difference within a preset range C, wherein the preset range C is smaller than the preset range B;
6) discharging at constant current until cut-off voltage is 2.6-2.8V and current is 0.05-0.1C;
7) placing the lithium ion batteries for 10 to 20 hours at the temperature of between 40 and 70 ℃, measuring the capacity of the lithium ion batteries, eliminating the lithium ion batteries with the SOC reduction range higher than 15 percent, sequencing the lithium ion batteries in the same group according to the capacity, and regrouping the lithium ion batteries with the capacity difference within a preset range D, wherein the preset range D is smaller than a preset range C;
9) charging to cut-off voltage with constant current of 0.1-0.5C, wherein the cut-off voltage is 4.2-4.5V;
10) the constant voltage charging is carried out by cut-off voltage until the charging current is less than 0.01C;
11) repeating the steps 2) to 10) for 1 to 3 times to finish the final matching; the predetermined range a is 8%, the predetermined range B is 7%, the predetermined range C is 6%, and the predetermined range D is 5%.
2. The method of claim 1, wherein the cut-off voltage of step 1) is 4.2-4.3V.
3. The method of claim 1, wherein the cutoff voltage of step 6) is 2.7V.
4. The method of claim 1, wherein the steps 1) -10) are repeated 2 times.
5. The method of claim 1, wherein the temperature in step 5) and/or 7) is 50-60 degrees celsius.
6. The battery pack consisting of the same battery pack is obtained according to the grouping method described in claim 1.
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| CN109216788A (en) * | 2017-06-29 | 2019-01-15 | 青岛恒金源电子科技有限公司 | A kind of method for group matching and its battery pack of lithium ion battery |
| CN108183271A (en) * | 2017-12-08 | 2018-06-19 | 北京康力优蓝机器人科技有限公司 | A kind of smart home lithium rechargeable battery method for group matching |
| CN110780220B (en) * | 2019-11-06 | 2021-10-29 | 浙江国净净化科技有限公司 | Power supply group selection method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104037456A (en) * | 2014-06-16 | 2014-09-10 | 张晶晶 | Rapid forming process of iron phosphate lithium battery |
| CN104607395A (en) * | 2013-11-01 | 2015-05-13 | 北汽福田汽车股份有限公司 | lithium ion battery sorting method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104607395A (en) * | 2013-11-01 | 2015-05-13 | 北汽福田汽车股份有限公司 | lithium ion battery sorting method |
| CN104037456A (en) * | 2014-06-16 | 2014-09-10 | 张晶晶 | Rapid forming process of iron phosphate lithium battery |
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