CN111665442A - Method for detecting connection quality of bus bar in series circuit in new energy lithium battery pack - Google Patents
Method for detecting connection quality of bus bar in series circuit in new energy lithium battery pack Download PDFInfo
- Publication number
- CN111665442A CN111665442A CN202010454007.6A CN202010454007A CN111665442A CN 111665442 A CN111665442 A CN 111665442A CN 202010454007 A CN202010454007 A CN 202010454007A CN 111665442 A CN111665442 A CN 111665442A
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- Prior art keywords
- battery pack
- bus
- bus bar
- series circuit
- voltage
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- 238000000034 method Methods 0.000 title claims abstract description 23
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 14
- 238000007600 charging Methods 0.000 claims abstract description 9
- 230000002159 abnormal effect Effects 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 238000010277 constant-current charging Methods 0.000 claims description 2
- 238000012512 characterization method Methods 0.000 abstract 1
- 230000010354 integration Effects 0.000 description 3
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- 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]
-
- 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]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
-
- 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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
Abstract
The invention provides a method for detecting the connection quality of a bus bar in a series circuit in a new energy lithium battery pack, which comprises the following steps: exposing the battery pack bus bar; to battery pack IEDischarging to a cut-off voltage; for battery pack with IECharging, namely measuring terminal voltages at two ends of a bus in the circuit, wherein the terminal voltage of the No. x bus is Vx; the maximum and minimum values of the terminal voltages in each bus are cut off, and the remaining terminal voltage values are averaged to obtain VAverage(ii) a Calculating the voltage Vx and V of each bus bar terminalAverageEx, Ex ═ Vx-VAverage|/VAverage(ii) a The control range of the difference Ex is not more than E; calculating Ex corresponding to each bus one by one, and judging that the x-number bus is well connected when the Ex is less than or equal to E; on the contrary, if Ex > E, the bus connection of number x is judged to be abnormal. Can carry out the data characterization to the busbar quality, the effectual quality problem to the busbar is screened, and can not increase the integrated degree of difficulty and the cost of battery package.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a method for detecting the connection quality of a bus bar in a series circuit in a new energy lithium battery pack.
Background
The bus bar in the new energy battery pack can ensure effective transmission of current only through reliable connection. If the bus bar connection fails, a large amount of heat is easily generated at the abnormal connection, which can lead to more rapid aging and attenuation of the battery and even to fire of the power battery in an extreme case. Therefore, detecting and controlling the connection quality of the busbars in the battery pack is of great importance to the performance and safety of the battery pack. Patent publication No. 206208240U provides a method of detecting a gap between a tab and a busbar by an apparatus; the clearance between the bus bar and the connecting piece is usually very small or even zero, which requires extremely high detection precision of the equipment, and meanwhile, the method is difficult to obtain accurate bus bar quality; patent application No. 201910168145.5 proposes a method for detecting busbars by using a control circuit, which can effectively detect each busbar in real time; however, this solution may increase many circuit components, increase the integration cost of the battery pack system, and increase the volume and the integration difficulty of the battery pack system.
Disclosure of Invention
The invention aims to provide a method for detecting the connection quality of a bus in a series circuit in a new energy lithium battery pack, which can effectively quantize the connection reliability of the bus in the battery pack; and the bus with the fault connection can be screened and recovered through a maintenance means through the quantized data.
In order to solve the technical problems, the invention adopts the following technical scheme: a method for detecting the connection quality of a bus bar in a series circuit in a new energy lithium battery pack comprises the following steps:
a: taking out the battery pack needing to detect the connection quality condition of the bus bar, and exposing the bus bar;
b: to battery pack pressing current IEDischarging the constant current to the cut-off voltage of the constant current, and holding Tmin n;
c: applying a current I to the battery packEPerform constant currentCharging, wherein the terminal voltage of two ends of each bus in the series circuit is measured in the charging process, and the terminal voltage of the No. x bus is Vx;
d: the maximum and minimum values of the terminal voltages in the buses are cut off, and the rest terminal voltage values are averaged to obtain VAverage；
e: calculating the voltage Vx and V of each bus bar terminalAverageThe difference between the terminal voltage of the x-th bus and the average value is Ex, Ex ═ Vx-VAverage|/VAverage；
f: voltage Vx and V at each busAverageThe control range of the difference Ex is not more than E;
g: calculating Ex corresponding to each bus one by one, and judging that the x-number bus is well connected when the Ex is less than or equal to E; on the contrary, if Ex is larger than E, the bus connection of the number x is judged to be abnormal;
wherein x is 1-n, and n is the total number of the busbars in the series circuit of the battery pack.
Optimized, it also includes step h: and c, replacing or reinstalling the backflow row with abnormal connection, and detecting again according to the steps b-g until Ex is less than or equal to E.
Optimized, E is less than or equal to 10-20%.
Optimally, the battery pack voltage is lower than the safe voltage in the charging process.
Optimized, T is more than 15 min.
Optimized, IE＞0.5C。
Further, in step b, the battery pack is discharged to its cut-off voltage at a constant current of the current 1C.
The invention has the beneficial effects that: according to the invention, through simple charging and discharging tests on the battery pack, data representation can be carried out on the quality of the busbar, the quality problem of the busbar can be effectively screened, and the integration difficulty and cost of the battery pack can not be increased.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention is described in detail below with reference to embodiments shown in the drawings to which:
as shown in fig. 1
The method for detecting the connection quality of the bus bar in the series circuit in the new energy lithium battery pack comprises the following steps:
a: taking out the battery pack needing to detect the connection quality condition of the bus bar, and exposing the bus bar;
b: discharging the battery pack to cut-off voltage according to a constant current of 1C, and standing for Tmin;
c: charging the battery pack with a constant current of 1C, measuring terminal voltages at two ends of each bus in the series circuit in the charging process, wherein the terminal voltage of the x-th bus is Vx;
d: the maximum and minimum values of the terminal voltages in the buses are cut off, and the rest terminal voltage values are averaged to obtain VAverage；
e: calculating the voltage Vx and V of each bus bar terminalAverageThe difference between the terminal voltage of the x-th bus and the average value is Ex, Ex ═ Vx-VAverage|/VAverage；
f: voltage Vx and V at each busAverageThe control range of the difference Ex is not more than E;
g: calculating Ex corresponding to each bus one by one, and judging that the x-number bus is well connected when the Ex is less than or equal to E; on the contrary, if Ex is larger than E, the bus connection of the number x is judged to be abnormal;
h: replacing or reinstalling the backflow rows with abnormal connection, and redetecting according to the steps b-g until Ex is less than or equal to E;
wherein x is 1-n, n is the total number of busbars in the series circuit of the battery pack, E is less than or equal to 10-20%, the voltage of the battery pack is lower than the safe voltage in the charging process, T is more than 15min, and the optimal value is 20 min.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (7)
1. A method for detecting the connection quality of a bus bar in a series circuit in a new energy lithium battery pack is characterized by comprising the following steps:
a: taking out the battery pack needing to detect the connection quality condition of the bus bar, and exposing the bus bar;
b: to battery pack pressing current IEDischarging at constant current until the cut-off voltage is reached, and holding Tmin;
c: applying a current I to the battery packEPerforming constant-current charging, wherein the terminal voltage of two ends of each bus in the series circuit is measured in the charging process, and the terminal voltage of the No. x bus is Vx;
d: the maximum and minimum values of the terminal voltages in the buses are cut off, and the rest terminal voltage values are averaged to obtain VAverage；
e: calculating the voltage Vx and V of each bus bar terminalAverageThe difference between the terminal voltage of the x-th bus and the average value is Ex, Ex ═ Vx-VAverage|/VAverage；
f: voltage Vx and V at each busAverageThe control range of the difference Ex is not more than E;
g: calculating Ex corresponding to each bus one by one, and judging that the x-number bus is well connected when the Ex is less than or equal to E; on the contrary, if Ex is larger than E, the bus connection of the number x is judged to be abnormal;
wherein x is 1-n, and n is the total number of the busbars in the series circuit of the battery pack.
2. The method for detecting the connection quality of the bus bar in the series circuit in the new energy lithium battery pack as claimed in claim 1, further comprising the step h of: and c, replacing or reinstalling the backflow row with abnormal connection, and detecting again according to the steps b-g until Ex is less than or equal to E.
3. The method for detecting the connection quality of the bus bar in the series circuit in the new energy lithium battery pack according to claim 1, wherein E is less than or equal to 10-20%.
4. The method for detecting the connection quality of the bus bars in the series circuit in the new energy lithium battery pack according to claim 1, wherein the battery pack voltage is lower than a safe voltage in the charging process.
5. The method for detecting the connection quality of the bus bar in the series circuit in the new energy lithium battery pack as claimed in claim 1, wherein T is more than 15 min.
6. The method for detecting the connection quality of the bus bar in the series circuit in the new energy lithium battery pack as claimed in claim 1, wherein IE＞0.5C。
7. The method for detecting the connection quality of the bus bar in the series circuit in the new energy lithium battery pack as claimed in claim 6, wherein in the step b, the battery pack is discharged to the cut-off voltage according to the constant current of the current 1C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010454007.6A CN111665442A (en) | 2020-05-26 | 2020-05-26 | Method for detecting connection quality of bus bar in series circuit in new energy lithium battery pack |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010454007.6A CN111665442A (en) | 2020-05-26 | 2020-05-26 | Method for detecting connection quality of bus bar in series circuit in new energy lithium battery pack |
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| CN111665442A true CN111665442A (en) | 2020-09-15 |
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| CN202010454007.6A Pending CN111665442A (en) | 2020-05-26 | 2020-05-26 | Method for detecting connection quality of bus bar in series circuit in new energy lithium battery pack |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749482A (en) * | 2015-03-25 | 2015-07-01 | 中航锂电（洛阳）有限公司 | Method for testing welding reliability of battery core |
| CN106932722A (en) * | 2015-12-30 | 2017-07-07 | 华为技术有限公司 | The internal short-circuit detection method and device of a kind of electrokinetic cell |
| CN108923084A (en) * | 2018-08-16 | 2018-11-30 | 超威电源有限公司 | A kind of test method of pole group pole plate current distribution |
| CN109342968A (en) * | 2018-11-02 | 2019-02-15 | 湖北德普智能装备有限公司 | Test device and test method before a kind of battery modules are welded |
| CN209280758U (en) * | 2018-11-02 | 2019-08-20 | 湖北德普智能装备有限公司 | A kind of testing jig for battery measurement |
| EP3817182A2 (en) * | 2020-08-18 | 2021-05-05 | Baidu Online Network Technology (Beijing) Co., Ltd. | Apparatus and method for controlling battery module, power supply device and system |
-
2020
- 2020-05-26 CN CN202010454007.6A patent/CN111665442A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749482A (en) * | 2015-03-25 | 2015-07-01 | 中航锂电（洛阳）有限公司 | Method for testing welding reliability of battery core |
| CN106932722A (en) * | 2015-12-30 | 2017-07-07 | 华为技术有限公司 | The internal short-circuit detection method and device of a kind of electrokinetic cell |
| CN108923084A (en) * | 2018-08-16 | 2018-11-30 | 超威电源有限公司 | A kind of test method of pole group pole plate current distribution |
| CN109342968A (en) * | 2018-11-02 | 2019-02-15 | 湖北德普智能装备有限公司 | Test device and test method before a kind of battery modules are welded |
| CN209280758U (en) * | 2018-11-02 | 2019-08-20 | 湖北德普智能装备有限公司 | A kind of testing jig for battery measurement |
| EP3817182A2 (en) * | 2020-08-18 | 2021-05-05 | Baidu Online Network Technology (Beijing) Co., Ltd. | Apparatus and method for controlling battery module, power supply device and system |
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Application publication date: 20200915 |