CN103390775A - Grouping method for lithium iron phosphate secondary batteries - Google Patents

Grouping method for lithium iron phosphate secondary batteries Download PDF

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Publication number
CN103390775A
CN103390775A CN2012101625256A CN201210162525A CN103390775A CN 103390775 A CN103390775 A CN 103390775A CN 2012101625256 A CN2012101625256 A CN 2012101625256A CN 201210162525 A CN201210162525 A CN 201210162525A CN 103390775 A CN103390775 A CN 103390775A
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CN
China
Prior art keywords
batteries
voltage
battery
grouping
standing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2012101625256A
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Chinese (zh)
Inventor
张良新
杨智宁
李学智
陈庆武
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZHEJIANG NABOOR POWER TECHNOLOGY Co Ltd
Original Assignee
ZHEJIANG NABOOR POWER TECHNOLOGY Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ZHEJIANG NABOOR POWER TECHNOLOGY Co Ltd filed Critical ZHEJIANG NABOOR POWER TECHNOLOGY Co Ltd
Priority to CN2012101625256A priority Critical patent/CN103390775A/en
Publication of CN103390775A publication Critical patent/CN103390775A/en
Pending legal-status Critical Current

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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The invention discloses a grouping method for lithium iron phosphate secondary batteries. The method comprises the following steps: a) subjecting batteries having undergone internal resistance sieving to charge-discharge test once, with end-off voltage being 2.0 V; b) grading batteries with qualified capacity into N grades according to a certain capacity range M; c) standing batteries having undergone discharging and grading for t1 h, allowing batteries of a same grade to be in parallel connection for t2 h, enabling mutual voltage difference to be less than or equal to 1 mV, carrying out measuring and recording voltage V1; d) standing the batteries at normal temperature for t3 h, carrying out measuring again, recording voltage V2 and calculating deltaV which satisfies the equation that deltaV=V2-V1; and e) grouping batteries with same deltaV together. According to the invention, the batteries are stood for a certain period of time after reaching a same voltage value, then voltage drop is calculated, batteries with a same voltage drop are grouped together, so consistency of batteries is guaranteed, and grouping quality is improved.

Description

A kind of method for group matching of LiFePO4 secondary cell
Technical field
The present invention relates to a kind of method for group matching of LiFePO4 secondary cell.
Background technology
Since secondary lithium battery and commercialization were developed in Japanese Sony company invention in 1991, lithium ion battery developed rapidly, its range of application expanding day, in recent years, lithium iron phosphate dynamic battery is at electric bicycle, and battery-operated motor cycle, constantly apply on electric automobile; Electrokinetic cell generally has the first combo of also going here and there again of cell to become battery pack, present method for group matching mainly contains three kinds, a kind of is according to internal resistance, capacity and self discharge sorting battery, the method is certain limit owing to setting self discharge, causing unavoidably the battery of the battery of self discharge maximum in setting range and self discharge minimum to be joined is a Battery pack, causes inconsistency between cell to strengthen gradually; Another kind of method for group matching is to carry out combo according to discharge curve, and also having a kind of is that simulated condition is measured voltage difference and carried out combo, and the common shortcoming of rear two kinds of methods is that present detecting box precision is inadequate, be difficult to accomplish the end in view, and process is loaded down with trivial details.
Summary of the invention
The method for group matching that the purpose of this invention is to provide a kind of LiFePO4 secondary cell, simplify the combo process, guarantees the consistency of cell, improved the combo quality.
To achieve the above object of the invention, the technical solution used in the present invention is: a kind of method for group matching of LiFePO4 secondary cell comprises the steps:
A) battery that through internal resistance, screens is carried out charge-discharge test one time, discharge cut-off voltage is 2.0V;
B) to carry out stepping by certain capacity scope M be the N shelves to the battery that capacity is qualified;
C) will discharge and finish to have divided the battery standing t of shelves 1After hour, will be with shelves cell parallel t 2Hour, make mutual voltage difference less than or equal to 1mV, measure and recording voltage V 1
D) the standing t of normal temperature 3Hour, measuring voltage and record V again 2, calculate Δ V=V 2-V 1
It is one group that the battery that e) will have an identical Δ V is joined.
Above-mentioned lithium ion battery grouping method, in step b, certain capacity scope M can be 50~500mA.Above-mentioned lithium ion battery grouping method, t in step c 1Be 2~12h, t 2Be 12~48h, t 3Be 144~264h.
Its technique effect is: the present invention places the certain hour calculating voltage and falls after making battery reach same magnitude of voltage, it is one group that the battery that voltage drop is identical is joined, guaranteeing to join is that the cell self discharge of a group is identical, has guaranteed the consistency of battery, has improved the combo quality.Easy operating of the present invention, have a good application prospect.
Embodiment
Below in conjunction with embodiment, the present invention is described further:
Embodiment one
Method for group matching of the present invention, carry out combo by following steps to battery:
1. choose 500, the qualified 10Ah battery of internal resistance,, with grading system on battery, after first being full of electricity by 0.5C, shelve 15min, then press the 0.5C discharge, cut-ff voltage is 2.0V;
2. get greater than the 10Ah battery totally 496 differences by 100mAh carry out stepping and be: 31 of 10.0~10.1Ah; 10.2 76 of~10.3Ah; 10.3 145 of~10.4Ah; 10.4 127 of~10.5Ah; 10.5 63 of~10.6Ah; 10.6 35 of~10.7Ah; 10.7 18 of~10.8Ah; 10.9 1 of~11.0Ah;
3. after battery standing 5h, select 76 cell parallel 24h of 10.2~10.3Ah capacity shelves after test capacity being finished, measuring voltage is V 1For 2.605V, individual cell is 2.604V and 2.606V;
4. after standing 264h, measure and recording voltage V 2Calculate Δ V=V 2-V 1
5. following concrete data for this example test
Numbering V 1(mV) V 2(mV) ΔV(mV)
1 2605 2608 3
2 2605 2609 4
3 2605 2609 4
4 2605 2604 -1
5 2605 2605 0
6 2605 2607 2
7 2605 2608 3
8 2605 2609 4
9 2605 2603 -2
10 2605 2608 3
11 2605 2600 -5
12 2605 2608 3
13 2605 2608 3
14 2604 2609 5
15 2605 2608 3
16 2605 2607 2
17 2606 2610 4
18 2605 2609 4
19 2605 2608 3
20 2605 2609 4
21 2605 2602 -3
22 2605 2618 13
23 2605 2603 -2
24 2605 2609 4
25 2605 2612 7
26 2605 2608 3
27 2605 2608 3
28 2605 2609 4
29 2605 2598 -7
30 2605 2609 4
31 2605 2604 -1
32 2605 2608 3
33 2605 2608 3
34 2605 2607 2
35 2605 2502 -103
36 2605 2608 3
37 2605 2608 3
38 2604 2609 5
39 2605 2605 0
40 2605 2604 -1
41 2605 2606 1
42 2605 2604 -1
43 2605 2602 -3
44 2605 2608 3
45 2606 2607 1
46 2605 2609 4
47 2605 2605 0
48 2605 2608 3
49 2605 2608 3
50 2605 2609 4
51 2605 2609 4
52 2605 2605 0
53 2605 2603 -2
54 2605 2613 8
55 2604 2607 3
56 2605 2606 1
57 2605 2602 -3
58 2605 2608 3
59 2605 2597 2
60 2605 2608 3
61 2605 2605 0
62 2605 2606 1
63 2605 2602 -3
64 2605 2608 3
65 2605 2607 2
66 2605 2605 0
67 2605 2607 2
68 2605 2609 4
69 2605 2613 8
70 2605 2600 -5
71 2605 2608 3
72 2605 2609 4
73 2605 2607 2
74 2605 2608 3
75 2605 2609 4
76 2605 2607 2
6., from upper table data, will be numbered 1,7,10,12,13,15,19,26,32,33,36, No. 37 battery and join the battery pack for 36V 10Ah, because cell has identical self discharge, for the consistency of battery pack provides good guarantee.Easy operating of the present invention, have a good application prospect.

Claims (3)

1. the method for group matching of a LiFePO4 secondary cell, is characterized in that the method comprises the steps:
A) battery that through internal resistance, screens is carried out charge-discharge test one time, discharge cut-off electricity is 2.0V;
B) to carry out stepping by certain capacity scope M be the N shelves to the battery that capacity is qualified;
C) will discharge and finish to have divided the battery standing t of shelves 1After h, will be with shelves cell parallel t 2H, make mutual voltage difference less than or equal to 1mV, measures and recording voltage V 1
D) the standing t of normal temperature 3H, measuring voltage and record V again 2, calculate Δ V=V 2-V 1
It is one group that the battery that e) will have an identical Δ V is joined.
2. lithium ion battery grouping method according to claim 1, is characterized in that in step b, certain capacity scope M can be 50~500mA.
3. lithium ion battery grouping method according to claim 1, is characterized in that t in step c 1Be 2~12h, t 2Be 12~48h, t 3Be 144~264h.
CN2012101625256A 2012-05-08 2012-05-08 Grouping method for lithium iron phosphate secondary batteries Pending CN103390775A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012101625256A CN103390775A (en) 2012-05-08 2012-05-08 Grouping method for lithium iron phosphate secondary batteries

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012101625256A CN103390775A (en) 2012-05-08 2012-05-08 Grouping method for lithium iron phosphate secondary batteries

Publications (1)

Publication Number Publication Date
CN103390775A true CN103390775A (en) 2013-11-13

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Country Link
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104091975A (en) * 2014-07-22 2014-10-08 合肥国轩高科动力能源股份公司 Efficient lithium battery matching method
CN104198943A (en) * 2014-08-05 2014-12-10 深圳市拓思创新科技有限公司 Performance detection method and system for lithium battery pack
CN103996543B (en) * 2014-05-22 2017-01-25 山东精工电子科技有限公司 Distribution and assembly method for supercapacitors
CN106371027A (en) * 2016-08-24 2017-02-01 合肥国轩高科动力能源有限公司 Testing method for echelon recycling and utilization of decommissioning batteries

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007220658A (en) * 2006-01-18 2007-08-30 Matsushita Electric Ind Co Ltd Packed battery, power supply system, and method of manufacturing packed battery
CN101764259A (en) * 2010-01-15 2010-06-30 苏州星恒电源有限公司 Method for group matching of power lithium-ion rechargeable battery
CN101924247A (en) * 2010-07-29 2010-12-22 江苏双登集团有限公司 Lithium ion battery grouping method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007220658A (en) * 2006-01-18 2007-08-30 Matsushita Electric Ind Co Ltd Packed battery, power supply system, and method of manufacturing packed battery
CN101764259A (en) * 2010-01-15 2010-06-30 苏州星恒电源有限公司 Method for group matching of power lithium-ion rechargeable battery
CN101924247A (en) * 2010-07-29 2010-12-22 江苏双登集团有限公司 Lithium ion battery grouping method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103996543B (en) * 2014-05-22 2017-01-25 山东精工电子科技有限公司 Distribution and assembly method for supercapacitors
CN104091975A (en) * 2014-07-22 2014-10-08 合肥国轩高科动力能源股份公司 Efficient lithium battery matching method
CN104198943A (en) * 2014-08-05 2014-12-10 深圳市拓思创新科技有限公司 Performance detection method and system for lithium battery pack
CN106371027A (en) * 2016-08-24 2017-02-01 合肥国轩高科动力能源有限公司 Testing method for echelon recycling and utilization of decommissioning batteries
CN106371027B (en) * 2016-08-24 2019-05-21 合肥国轩高科动力能源有限公司 A kind of test method that the echelon of retired battery recycles

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Application publication date: 20131113