CN102148393A - Battery pack and manufacturing method thereof - Google Patents
Battery pack and manufacturing method thereof Download PDFInfo
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- CN102148393A CN102148393A CN2010101117758A CN201010111775A CN102148393A CN 102148393 A CN102148393 A CN 102148393A CN 2010101117758 A CN2010101117758 A CN 2010101117758A CN 201010111775 A CN201010111775 A CN 201010111775A CN 102148393 A CN102148393 A CN 102148393A
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- 238000012216 screening Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 8
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 6
- 229910001416 lithium ion Inorganic materials 0.000 description 6
- 230000014759 maintenance of location Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
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- 101100121770 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GID8 gene Proteins 0.000 description 1
- 101100009020 Schizosaccharomyces pombe (strain 972 / ATCC 24843) dcr1 gene Proteins 0.000 description 1
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- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
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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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention discloses a manufacturing method of a battery pack. The method comprises the following steps: controlling discharge total current I under a certain discharge depth, connecting P batteries with the same type in parallel for discharge, and collecting parallel connection current I1, I2...In...IP of each battery, wherein the discharge total current I=I1+I2+...In...+IP at this time, n is serial number of the battery, and the batteries with the parallel connection current in the following range are qualified batteries: In is not less than I*(1-0.066)/P and not more than I*(1+0.066)/P; selecting at least one group of batteries from the qualified batteries, wherein each group comprises Q batteries; and connecting the Q batteries in each group in parallel for forming the battery pack. The invention further discloses the battery pack, and the battery pack is prepared according to the method. By adopting the method, the performances of the battery pack can be improved.
Description
Technical field
The present invention relates to a kind of battery pack and manufacture method thereof.
Background technology
Along with exploitation, the application of lithium-ion electric electrical automobile and electric tool are increasingly extensive, the demand of lithium ion battery group is also increasing, but the production process of lithium ion battery is very complicated, and the consistency of lithium ion battery is difficult to accomplish.
The inconsistent meeting that constitutes the lithium ion battery of lithium ion battery group causes the cycle life of whole battery group to shorten, even super-charge super-discharge, causes safety problem.Often a battery is relatively poor, can influence the performance of whole battery group, therefore need screen cell, and selection consistency battery is preferably made battery pack.
The consistency of battery is meant the consistency of the parameters of battery, mainly is the capacity and the internal resistance of battery.The mode of usually cell being screened is that the interchange internal resistance (ACR) of battery is selected, but in actual charge and discharge process all be D.C. resistance (DCR) in action.
The test of D.C. resistance is normally tested after battery reaches stable state, but the value of D.C. resistance changes with the variation of depth of discharge (DOD), so the method for testing more complicated of D.C. resistance, and to the equipment precision requirement height.The resolution of existing method of testing can't reach the requirement that filters out the good battery of consistency usually, and therefore, it is not good that the battery that existing method filters out carries out the battery performance that combo produces.
Summary of the invention
The invention provides a kind of method of making battery pack, can improve the performance of battery pack.
On the one hand, the invention discloses a kind of manufacture method of battery pack, comprise following steps:
(1) under certain depth of discharge, control discharge total current I with P battery of the same type parallel discharge, gathers the parallel-current I of each battery
1, I
2... I
n... I
P, total current I=I discharges this moment
1+ I
2+ ... I
n...+I
P, wherein n is the battery sequence number;
(2) parallel-current is qualified battery: I* (1-0.066)/P≤I in following scope
n≤ I* (1+0.066)/P;
(3) from qualified battery, choose at least one Battery pack, every group of Q battery;
(4) with every group of Q battery and be unified into battery pack.
Among the embodiment of the manufacture method of above-mentioned battery pack, in the described step (1), carry out parallel discharge under certain depth of discharge, described depth of discharge is for being not more than 50%.
Among the embodiment of the manufacture method of above-mentioned battery pack, in the described step (1), carry out parallel discharge under certain depth of discharge, described depth of discharge is for being not more than 30%.
Among the embodiment of the manufacture method of above-mentioned battery pack, in the described step (1), carry out parallel discharge under certain depth of discharge, described depth of discharge is 5%-15%.
Among the embodiment of the manufacture method of above-mentioned battery pack, in the described step (1), carry out parallel discharge under certain depth of discharge, described depth of discharge is 10%.
Among the embodiment of the manufacture method of above-mentioned battery pack, in the described step (1), the scope of discharge total current I is: 0.4C*P≤I≤3C*P, and wherein C is a current value, be the constant current value that battery discharged fully with 1 hour time, its value equals the rated capacity value of this battery.
Among the embodiment of the manufacture method of above-mentioned battery pack, in the described step (1), 0.7C*P≤I≤1.5C*P.
Among the embodiment of the manufacture method of above-mentioned battery pack, described step (3) also comprises battery parallel-current I
nOrdering, parallel-current I when guaranteeing to choose every group of Q battery
nThe dispersion minimum.
Among the embodiment of the manufacture method of above-mentioned battery pack, described step (1) is the constant current discharge.
Among the embodiment of the manufacture method of above-mentioned battery pack, in the described step (3),, then also comprise step (5) afterwards: will organize the battery pack series connection that constitutes by Q battery in described step (4) if chosen at least two Battery packs more.
On the other hand, the invention also discloses a kind of battery pack, described battery pack is according to above-mentioned method manufacturing.
Compared with prior art, beneficial effect of the present invention is:
The present invention adopts and will wait to select the battery parallel discharge, under certain depth of discharge, gather the parallel-current that each waits to select battery, filter out the battery of parallel-current in acceptability limit, with qualified battery by parallel-current sort, combo, make the method for required battery pack and make battery pack, when parallel discharge, control certain depth of discharge, can make battery dc resistance comparatively stably the stage discharge, make by the consistency of parallel-current and judge that the conforming result of D.C. resistance is comparatively accurate; Control certain depth of discharge, also can improve the resolution of screening; Control discharge total current is carried out parallel discharge, can make the screening of parallel-current more accurate; Filter out qualified battery by parallel-current, and with qualified battery ordering, combo, make battery pack, method is simple, and the reliability height is made battery pack by said method, can improve the performance of battery pack.
Description of drawings
Fig. 1 has exemplarily described the structure chart that battery is selected cabinet;
Fig. 2 has exemplarily described the variation diagram of dc resistance with depth of discharge;
Fig. 3 has exemplarily described the variation diagram of parallel-current with depth of discharge;
Fig. 4 exemplarily described depth of discharge less than 50% o'clock, the graph of a relation of D.C. resistance and parallel-current;
Fig. 5 has exemplarily described the performance comparison figure that adopts the inventive method battery pack of making and the battery pack that adopts prior art to make.
Embodiment
Contrast accompanying drawing and the present invention is further elaborated below in conjunction with embodiment.
The invention discloses a kind of battery that is used to make battery pack and select cabinet, as shown in Figure 1, this battery is selected cabinet and is comprised a plurality of passages, and each passage parallel connection is used for battery parallel discharge to be selected.Battery is selected cabinet and is also comprised the current acquisition module, is used to gather the parallel-current that each waits to select battery.
The invention also discloses a kind of method of making battery pack, said method comprising the steps of:
(1) under certain depth of discharge, control discharge total current I with P battery of the same type parallel discharge, gathers the parallel-current I of each battery
1, I
2... I
n... I
P, total current I=I discharges this moment
1+ I
2+ ... I
n...+I
P, wherein n is the battery sequence number;
(2) parallel-current is qualified battery: I* (1-0.066)/P≤I in following scope
n≤ I* (1+0.066)/P;
(3) from qualified battery, choose at least one Battery pack, every group of Q battery;
(4) with every group of Q battery and be unified into battery pack.
As shown in Figure 2, the resistance of the D.C. resistance of battery changes with depth of discharge, when depth of discharge less than 60% the time, the value of D.C. resistance is comparatively steady, when depth of discharge greater than 60% the time, the variation of D.C. resistance is comparatively obvious.
In theory, the consistency of judging battery is meant when same depth of discharge, judge the capacity and the internal resistance of battery, the method for test internal resistance is the electric discharge electric current normally, but in the reality test, all batteries all accurately can't be controlled at same depth of discharge discharges, therefore, in order to improve accuracy of test, need depth of discharge with all batteries all be controlled at dc resistance stage comparatively stably, therefore, depth of discharge should be controlled at less than 60%.
The size of the parallel-current of same battery is relevant with depth of discharge, Fig. 3 has exemplarily described the relation of four batteries parallel-currents when different depth of discharge, the D.C. resistance difference of four batteries among the figure, DCR1＞DCR2=DCR3=DCR4, these four battery parallel discharge total currents are 10A, and average current is 2.5A.
As shown in Figure 3, at depth of discharge less than 50% o'clock, parallel-current I1＜I2 ≈ I3 ≈ I4, when depth of discharge greater than 50% the time, parallel-current I1＞I2 ≈ I3 ≈ I4.
Hence one can see that, when depth of discharge less than 50% the time, the parallel-current of the battery that D.C. resistance is identical is basic identical, the parallel-current difference of the battery that D.C. resistance is different, and depth of discharge is more little, it is big more that the parallel-current of the battery that D.C. resistance is different differs, be that depth of discharge is more little, the resolution of parallel-current is high more, therefore, depth of discharge is more little, judges that by the consistency of parallel-current the conforming resolution of D.C. resistance is just high more.
In conjunction with the relation between depth of discharge, D.C. resistance, the parallel-current three among Fig. 2, Fig. 3, can release, when screening the battery of high conformity by the collection parallel-current, depth of discharge need be controlled at and be not more than 50%, in order to improve resolution, depth of discharge can be controlled at and be not more than 30%, rule of thumb be worth, effect was better when depth of discharge was 5%-15%.
The more little resolution of depth of discharge is high more in theory, but is difficult in the practical operation depth of discharge is controlled at very little scope, so depth of discharge is 10% to be preferred value.
At depth of discharge less than 50% o'clock, the relation of parallel-current and D.C. resistance as shown in Figure 4,20 batteries exemplarily having described random choose among Fig. 4 carry out the test result of parallel discharge, the average current of these 20 batteries is 2.7A, as seen from Figure 4, D.C. resistance is little, and parallel-current is big; D.C. resistance is big, and parallel-current is little.
Therefore, less than 50% o'clock, can pass through relatively parallel-current at depth of discharge, the battery that D.C. resistance is higher and on the low side is rejected away, and the battery that therefrom filters out high conformity is then made battery pack.
Embodiment one:
When battery sum to be selected is selected the passage number of cabinet less than battery, when battery sum promptly to be selected is counted less than maximum batteries in parallel connection, for example battery is selected totally 200 of cabinet port numbers, wait to select totally 20 on battery 18650 (rated capacity 2.2Ah), need make 2 and 3 string notebook battery pack this moment, the method for then making battery pack may further comprise the steps:
Step 101 is put into battery with 20 batteries and is selected cabinet, when depth of discharge 10%, control discharge total current I=2.2*20=44A parallel discharge, the parallel-current of gathering each battery, the parallel-current that collects as shown in Table 1:
Table one
Gather parallel-current and can also can gather electric current by the ammeter collection by the voltage of gathering fixed value resistance.
In this embodiment, during parallel discharge be the constant current discharge.
Step 102 filters out the battery of parallel-current in acceptability limit.
The parallel-current I of cell
nAt I* (1-0.066)/P≤I
n≤ I* (1+0.066)/P scope with interior be judged to be qualified.
In the practical operation, parallel-current accurately can't be controlled at 44A discharges, therefore need be within the specific limits with the control of discharge total current, the scope of discharge total current is: 0.4C*P≤I≤3C*P, preferable range is 0.7C*P≤I≤1.5C*P, wherein C is a current value, i.e. the battery constant current value of discharging fully with 1 hour time, and its value equals the rated capacity value of this battery.
In the present embodiment, the scope of discharge total current is 17.6A≤I≤132A, and preferable range is 30.8A≤I≤66A, among this embodiment, calculates the total current I=43.9992A that can discharge according to the parallel-current of table one, within preferable range.
The parallel-current acceptability limit that calculates is 2.0548A≤I
n≤ 2.3452A, the battery that exceeds this scope is defective, needs to reject, in the last table, the underproof battery of rejecting is represented with strikethrough.
Step 103 sorts by parallel-current to qualified battery, carries out combo then on request.
2 and 3 string battery pack are to constitute sub-battery pack by 2 batteries in parallel connection, then 3 groups of these sub-battery pack series connection are constituted.Therefore, battery is sorted by the descending order of parallel-current, then according to ordering, 2 one group is carried out combo in parallel, the combo situation as shown in Table 2:
Table two
| First group | Second group | The 3rd group | The 4th group | The 5th group | The 6th group | The 7th group | |
| 2.3267 | 2.3004 | 2.2408 | 2.2032 | 2.1892 | 2.1837 | 2.1537 | 2.0599 |
| 2.3093 | 2.2902 | 2.2274 | 2.1962 | 2.1878 | 2.1832 | 2.1341 |
If only need a sub-battery pack in parallel, choose then that arbitrary batteries in parallel connection group that combines gets final product in the table two.
Step 104 is chosen any 3 groups of sub-battery pack series connection in the table two, makes 2 and 3 required string battery pack.
Usually select the parallel-current value better, so can select fourth, fifth, six group of sub-battery pack in parallel to be connected into needed battery pack in the present embodiment near the performance of the produced battery pack of in parallel sub-battery pack of rated current 2.2A.
Generally speaking, if battery sum to be selected is selected the passage number of cabinet less than battery, and what need manufacturing is the battery pack of i and j string, then after the ordering, choose i the continuous battery of ordering successively and be made into a sub-battery pack of parallel connection, select j sub-battery pack series connection in parallel then, manufacture required battery pack.
According to after the parallel-current ordering, select the continuous battery of ordering to be made into sub-battery pack in parallel, parallel-current I in the time of can guaranteeing to choose every Battery pack
nThe dispersion minimum.
Adopt method of the present invention, can filter out consistency preferably cell be made into battery pack, can obviously improve the cycle performance of battery pack.
Fig. 5 is the comparison diagram that adopts the present invention and adopt the cycle performance of the battery pack that prior art makes respectively, and the cycle performance curve of the battery pack that fine rule is made for the present invention among the figure, thick line are the cycle performance curve of the battery pack made of prior art.
By finding out among the figure, increase along with the cycle charging number of times, the capability retention of the battery pack that the present invention and prior art are made all descends to some extent, but the capability retention of battery pack of the present invention is better than the battery pack of prior art: when the cycle charging number of times is about 100 times, the capability retention of battery pack of the present invention descends not obvious, and the battery pack of prior art descends comparatively obvious; When about 300 times of cycle charging number of times, the capability retention of battery pack of the present invention slightly descends, but still greater than 90%, the capability retention of the battery that prior art is made then drops to below 80%; When about 600 times of cycle charging number of times, the capability retention of battery pack of the present invention is still more than 80%, and the battery pack of prior art then drops to about 60%.
This shows, the battery pack that adopts method of the present invention to manufacture, performance is better, adopts method of the present invention to make battery pack, can obviously improve the performance of battery pack.
Embodiment two:
When battery sum to be selected is selected the passage number of cabinet greater than battery, for example battery is selected totally 200 of cabinet port numbers, totally 2000 on battery 26650 (rated capacity 2.7Ah), the Notebook Battery group of configuration 50 and 20 strings, the method for then making battery pack may further comprise the steps:
Step 201,2000 batteries are divided into 20 groups, every group of 100 batteries, arbitrary Battery pack is put into battery select cabinet, under 10% depth of discharge, control parallel discharge total current I=2.7*100=270A carries out parallel discharge, gathers the parallel-current of each battery, the parallel-current that collects as shown in Table 3:
Table three
The 100PCS battery current
Generally speaking, make the battery pack of M and N string, need N sub-battery pack in parallel, then battery to be selected is divided into N group, for example present embodiment is 50 and 20 string battery pack, needs 20 sub-battery pack of parallel connection, then 2000 batteries is divided into 20 groups, can save testing time and time like this, also can make every group battery as much as possible to be screened is arranged.
Certainly, in the specific implementation, need divide into groups as the case may be, below be several grouping situations:
Battery to be screened is divided into after N the group,, then a Battery pack is put into battery at every turn and selected cabinet and carry out parallel discharge if every group battery number is selected the port number of cabinet less than battery.
Battery to be screened is divided into after N the group,, then needs every Battery pack is carried out parallel discharge in batches if every group battery number is still selected the port number of cabinet greater than battery.For example there are 300 batteries grouping back for every group, but battery selects cabinet and have only 200 passages, needs that then these 300 batteries are divided into two batches again and puts into battery and select cabinet and carry out parallel discharge.
If battery is selected the battery number that the port number of cabinet needs less than the sub-battery pack of parallel connection, for example the sub-battery pack of parallel connection needs 50 batteries, but battery is selected cabinet and is had only 40 passages, parallel discharge after can dividing into groups according to every group of 40 batteries this moment, but two groups or more test result need be merged in the time of screening, therefrom filter out 50 batteries; Also can divide into groups many batches of parallel discharges of every component according to the number of the sub-battery pack of required parallel connection.
Step 202 filters out the battery of parallel-current in acceptability limit.
As calculated, present embodiment discharge total current is 271.8661A, and in preferable range, and the parallel-current acceptability limit is 2.5392A≤I
n≤ 2.8981A, the battery that exceeds this scope is defective, in the table three, the underproof battery of rejecting is represented with strikethrough.
Group technology during parallel discharge is a lot, but is screening, in the combo, needing to guarantee the battery number that every group battery number for screening needs greater than the sub-battery pack of parallel connection, therefore need be according to preliminary treatment such as actual conditions merge.For example in the present embodiment, each sub-battery pack in parallel needs 50 batteries, then want 50 batteries at least for every group, the parallel-current of considering some battery can exceed acceptability limit, therefore every group should have 60 or more battery, if every Battery pack then needs to merge before screening less than 60 during parallel discharge.
Step 203 sorts by parallel-current to qualified battery, therefrom selects the battery of 50 continuous parallel-current correspondences that sort to be made into sub-battery pack in parallel.
Usually select the performance of the battery pack that the parallel-current value manufactures near the in parallel sub-battery pack of rated current 2.7A better, therefore in the present embodiment, with the 2.7006A near rated current is the center, in sequencing table, select parallel-current greater than 2.7006A's, 24 on continuous battery sorts, select parallel-current less than 2.7006A's, 25 on continuous battery sorts, add the battery of rated current 2.7006A correspondence, totally 50 continuous batteries of parallel-current ordering are formed sub-battery pack in parallel, also can select other 50 the continuous batteries of ordering to be made into sub-battery pack in parallel according to actual conditions.
Step 204, repeating step 201 be to step 203, all the other 19 Battery packs are screened, are made into sub-battery pack in parallel after, the Notebook Battery groups of 50 and 20 required strings are made in 20 sub-battery pack series connection of parallel connection altogether.
The present invention adopts and will wait to select the battery parallel discharge, under certain depth of discharge, gather the parallel-current that each waits to select battery, filter out the battery of parallel-current in acceptability limit, with qualified battery by parallel-current sort, combo, make the method for required battery pack and make battery pack, when parallel discharge, control certain depth of discharge, can make battery dc resistance comparatively stably the stage discharge, make by the consistency of parallel-current and judge that the conforming result of D.C. resistance is comparatively accurate; Control certain depth of discharge, also can improve the resolution of screening; Control discharge total current is carried out parallel discharge, can make the screening of parallel-current more accurate; Filter out qualified battery by parallel-current, and with qualified battery ordering, combo, make battery pack, method is simple, and the reliability height is made battery pack by said method, can improve the performance of battery pack.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, but this example of just lifting for ease of understanding should not think that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can make various possible being equal to and change or replacement, these changes or replacement all should belong to protection scope of the present invention.
Claims (11)
1. the manufacture method of a battery pack is characterized in that, comprises following steps:
(1) under certain depth of discharge, control discharge total current I with P battery of the same type parallel discharge, gathers the parallel-current I of each battery
1, I
2... I
n... I
P, total current I=I discharges this moment
1+ I
2+ ... I
n...+I
P, wherein n is the battery sequence number;
(2) parallel-current is qualified battery: I* (1-0.066)/P≤I in following scope
n≤ I* (1+0.066)/P;
(3) from qualified battery, choose at least one Battery pack, every group of Q battery;
(4) with every group of Q battery and be unified into battery pack.
2. the manufacture method of battery pack as claimed in claim 1 is characterized in that, in the described step (1), described depth of discharge is for being not more than 50%.
3. the manufacture method of battery pack as claimed in claim 1 is characterized in that, in the described step (1), described depth of discharge is for being not more than 30%.
4. the manufacture method of battery pack as claimed in claim 1 is characterized in that, in the described step (1), described depth of discharge is 5%-15%.
5. the manufacture method of battery pack as claimed in claim 1 is characterized in that, in the described step (1), described depth of discharge is 10%.
6. the manufacture method of battery pack as claimed in claim 1, it is characterized in that, in the described step (1), the scope of discharge total current I is: 0.4C*P≤I≤3C*P, wherein C is a current value, be the constant current value that battery discharged fully with 1 hour time, its value equals the rated capacity value of this battery.
7. the manufacture method of battery pack as claimed in claim 6 is characterized in that, in the described step (1), and 0.7C*P≤I≤1.5C*P.
8. the manufacture method of battery pack as claimed in claim 1 is characterized in that, described step (3) is carried out as follows: to battery parallel-current I
nThe continuous battery of ordering is selected in ordering, parallel-current I when guaranteeing to choose every group of Q battery
nThe dispersion minimum.
9. the manufacture method of battery pack as claimed in claim 1 is characterized in that, described step (1) is the constant current discharge.
10. the manufacture method of battery pack as claimed in claim 1 is characterized in that, in the described step (3), if chosen at least two Battery packs, then also comprises step (5) afterwards in described step (4): will organize the battery pack series connection that is made of Q battery more.
11. a battery pack is characterized in that, described battery pack is according to each described method manufacturing of claim 1 to 10.
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|---|---|---|---|
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|---|---|---|---|
| CN201010111775.8A CN102148393B (en) | 2010-02-08 | 2010-02-08 | Battery pack and manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113161996A (en) * | 2021-05-11 | 2021-07-23 | 国网湖南省电力有限公司 | Energy storage battery stack protection circuit and protection method thereof |
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| US20030041445A1 (en) * | 2001-09-03 | 2003-03-06 | Jee-Hwan Jang | Method of grouping single cells of power sources to build optimal packs using parameters obtained by analysis of impedance spectrum |
| CN1876256A (en) * | 2005-06-06 | 2006-12-13 | 深圳市比克电池有限公司 | Battery screening system and method |
| CN101073800A (en) * | 2006-05-16 | 2007-11-21 | 顺达科技股份有限公司 | Method for sifting and classifying assembled battery efficiency |
-
2010
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030041445A1 (en) * | 2001-09-03 | 2003-03-06 | Jee-Hwan Jang | Method of grouping single cells of power sources to build optimal packs using parameters obtained by analysis of impedance spectrum |
| CN1876256A (en) * | 2005-06-06 | 2006-12-13 | 深圳市比克电池有限公司 | Battery screening system and method |
| CN101073800A (en) * | 2006-05-16 | 2007-11-21 | 顺达科技股份有限公司 | Method for sifting and classifying assembled battery efficiency |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113161996A (en) * | 2021-05-11 | 2021-07-23 | 国网湖南省电力有限公司 | Energy storage battery stack protection circuit and protection method thereof |
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