CN102004204A - Method for detecting false solder of battery pack - Google Patents
Method for detecting false solder of battery pack Download PDFInfo
- Publication number
- CN102004204A CN102004204A CN 200910189809 CN200910189809A CN102004204A CN 102004204 A CN102004204 A CN 102004204A CN 200910189809 CN200910189809 CN 200910189809 CN 200910189809 A CN200910189809 A CN 200910189809A CN 102004204 A CN102004204 A CN 102004204A
- Authority
- CN
- China
- Prior art keywords
- joint
- cell
- electric battery
- battery
- voltage
- 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.)
- Granted
Links
Images
Landscapes
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a method for detecting the false solder of a battery pack formed by connecting n single batteries in series and/or parallel through electrode terminals. The method comprises the following steps of: charging the battery pack with current not smaller than 2C multiplying power and detecting the voltage Ui of each single battery; and judging that the ith single battery has false solder when the voltage Ui of the ith single battery is larger than a preset value, wherein i and n are both natural numbers, and i is the number of the single battery. The test method provided by the invention can very rapidly, simply, conveniently and accurately detect connecting false solder joints in the battery pack, find the false solder position in time, maintain the battery pack, not only ensure the normal use of the battery pack, but also ensure the safe application of the battery pack to an electric vehicle.
Description
[technical field]
The present invention relates to a kind of power battery pack, especially relate to the detection method that rosin joint connects in a kind of power battery pack.
[background technology]
Rechargeable lithium battary has very wide range of application, such as the power supply of Notebook Battery, battery of mobile phone, electric tool, the network equipment and other personal electronic equipments.The power supply of these device requirements is that lightweight, electric power output require medium or littler battery.Yet on other equipment, rechargeable lithium battary also can provide than the higher electric power of the said equipment demand electric power, and the lithium battery of exporting as height can be used as industrial power equipment, high power communication facility, electric automobile etc.In the electric automobile field, the maturation of the lithium battery system of high output is a tangible expulsive force.
Lithium battery will reach high output, needs a plurality of cell serial or parallel connections to improve the energy content of battery or battery output efficiency.A plurality of cells can adopt modes such as electrode terminal is welded to connect, screw retention connection to carry out serial or parallel connection usually in the prior art, and when electric battery is applied in the electric motor car, may can cause connections such as battery sealing-off or rosin joint unreliable owing to following reason: it is unreasonable that battery cell connects design; Becoming flexible or disconnecting appears in the junction through long-time vibration battery.When a kind of rosin joint situation in back occurring, be difficult to find faulty soldered joint again by methods such as visual inspections, and the existence of faulty soldered joint has a strong impact on the use that discharges and recharges of electric battery, more likely cause the safety problem of electric battery.Therefore find the rosin joint position as early as possible, and the rosin joint battery safeguarded seem very important.
[summary of the invention]
The technical matters that the present invention solves is that prior art medium power electric battery rosin joint etc. in use takes place connects indiscoverable problem when insecure, and a kind of method of the detection electric battery rosin joint that is easy to realize is provided especially.
The invention provides a kind of method that detects the electric battery rosin joint, comprise that n joint cell is through electrode tip substring and/or parallel battery; Electric battery is carried out the charging that electric current is not less than the 2C multiplying power, detect the voltage U of every joint cell simultaneously
iVoltage U when i joint cell
iDuring greater than predetermined value, i.e. i joint cell generation rosin joint; Wherein i, n are natural number, and i is the cell numbering.
The method of detection electric battery rosin joint provided by the invention, by electric battery being carried out large current charge (electric current is more than or equal to 2C), voltage when testing every joint cell heavy-current discharge again, if the voltage that records is greater than the charging deboost of a predetermined value or lithium battery, can judge electric battery rosin joint position, time spent is extremely lacked (about 0.1 second), thereby very easy and can accurately detect connection faulty soldered joint in the electric battery.And in time find the rosin joint position, and electric battery is safeguarded, be not only electric battery normally to use, and can guarantee the application of electric battery safety in electric vehicle.
[description of drawings]
Fig. 1 is a kind of concrete cell potential test point distribution schematic diagram in the method for testing provided by the invention.
Fig. 2 is a batteries charging voltage curve synoptic diagram in the embodiment provided by the invention.
[embodiment]
Describe the detailed content of test battery group rosin joint method provided by the invention in detail below in conjunction with the drawings and the specific embodiments.
The invention provides a kind of method that detects the electric battery rosin joint, comprise that n joint cell is through electrode tip substring and/or parallel battery; Electric battery is carried out the charging that electric current is not less than the 2C multiplying power, detect the voltage U of every joint cell simultaneously
iVoltage U when i joint cell
iDuring greater than predetermined value, i.e. i joint cell generation rosin joint; Wherein i, n are natural number, and i is the cell numbering.Wherein, described predetermined value is the charging limiting protecting magnitude of voltage of lithium battery generally speaking, also can be a value about the big 0.3V of charging platform of relative cell.And adopting the lithium battery of different positive electrode systems, charge protection magnitude of voltage difference is 3.8V as the charge protection voltage that adopts LiFePO 4 material to do positive electrode; And adopt lithium manganate material to do positive electrode charge protection voltage is 4.2V.
The inventor further discovers, take place in the electric battery rosin joint maximum may be junction between cell and the adjacent monomer battery, no matter be the electric battery that is welded to connect by electrode terminal, or the electric battery that connects of other modes such as screw, be not always the case.For making the present invention can test out faulty soldered joint between cell and the adjacent monomer battery more easily, the present invention is further preferably undertaken by following method.
Shown in Figure of description 1, shown a kind of concrete cell potential test point distribution schematic diagram in the method for testing provided by the invention, wherein, n joint cell 1 forms electric battery, 3 places among pad such as the figure by electrode terminal 2 welding series connection.
At first, demarcate the extreme electromotive force V of described electric battery negative electricity
1=0V from the negative electricity of electric battery extremely, tests the electromotive force V of the negative electrode terminal of every joint cell successively
2..., V
i..., V
N-1, V
n, V
N+1As shown in fig. 1, the pad 3 between the 1st joint cell and the 2nd joint cell is positioned at V
1Potential test point and V
2Between the potential test point, the pad 3 between i joint cell and the i+1 joint cell is positioned at V
iPotential test point and V
I+1Between the potential test point, there is not pad between described n joint cell negative electrode terminal and the anode electrode terminal, therefore, U
i=V
I+1-V
i
In like manner, and method of the present invention is also feasible fully for the test starting point from the positive electricity end of electric battery.Demarcate the electromotive force V ' of described electric battery positive electricity end
i=0V from the positive electricity end of electric battery, tests the electromotive force V ' of the anode electrode terminal of every joint cell successively
i, the tie point of described i joint cell and i+1 joint cell is distributed between adjacent two potential test points, therefore, and U '
i=V '
i-V '
I+1
Monomer battery voltage U in the time of can testing out large current charge respectively by above step
i, work as voltage U
iDuring greater than predetermined value, promptly can judge it is that i joint and i+1 save the electrode terminal weld generation rosin joint between the cell.
The present inventor finds unexpectedly, when big multiplying power electric current passes through weld, if weld is talked about normally, the voltage that the test of each potential test point obtains can be represented the magnitude of voltage of every joint monomer normally, if rosin joint then near the magnitude of voltage this fluctuate at short notice greatly.
The inventor further finds, if there is rosin joint in certain point of electric battery, when big electric current passes through, can cause the contact resistance between battery to increase, and the single battery voltage swells causes electric battery can not filled when charging.Therefore detection means of the present invention uses big multiplying power electric current that the contact resistance at rosin joint place is risen rapidly, and electric current is 2C at least.
In the method for the present invention, for electric battery is carried out large current charge, further be preferably greater than and equal the charging of 2C smaller or equal to 3C, if electric current does not reach the purpose of test less than 2C, unsafe factor may appear but too greatly also can try test, and therefore proper smaller or equal to the scope of 3C more than or equal to 2C.
Embodiment
One electric battery faulty soldered joint is detected.Described battery capacity is 50A, and is that 10 joint cells form by electrode terminal welding series connection.The positive electrode system of cell adopts LiFePO 4 material, and charge protection voltage is 3.8V.
At first, adopt shown in the Figure of description 1 the electromotive force check point is set, wherein n is 10.Electric battery is carried out the charging of 2C, wherein, charging current is 100A again, and the duration is 0s-1.2s, and 0.1s, and detection at interval respectively saves monomer battery voltage, and the voltage of record cell is U
1-U
10After charging finished, it is normal that each monomer battery voltage recovers.Test result such as table 1, test curve such as accompanying drawing 2.
Table 1 test result
| Time (s) | U 1(V) | U 2(V) | U 3(V) | U 4(V) | U 5(V) | U 6(V) | U 7(V) | U 8(V) | U 9(V) | U 10(V) |
| 0.0 | 3.288 | 3.29 | 3.287 | 3.287 | 3.318 | 3.318 | 3.289 | 3.291 | 3.318 | 3.319 |
| 0.1 | 3.288 | 3.29 | 3.287 | 3.287 | 3.318 | 3.318 | 3.289 | 3.291 | 3.318 | 3.319 |
| 0.2 | 3.288 | 3.29 | 3.287 | 3.287 | 3.318 | 3.318 | 3.289 | 3.291 | 3.318 | 3.319 |
| 0.3 | 3.288 | 3.29 | 3.287 | 3.287 | 3.318 | 3.318 | 3.289 | 3.291 | 3.318 | 3.319 |
| 0.4 | 3.576 | 3.623 | 3.626 | 3.585 | 3.318 | 3.318 | 3.289 | 3.291 | 3.318 | 3.319 |
| 0.5 | 3.576 | 3.623 | 3.626 | 3.585 | 3.781 | 3.669 | 3.614 | 3.583 | 3.318 | 3.319 |
| Time (s) | U 1(V) | U 2(V) | U 3(V) | U 4(V) | U 5(V) | U 6(V) | U 7(V) | U 8(V) | U 9(V) | U 10(V) |
| 0.6 | 3.576 | 3.623 | 3.626 | 3.585 | 3.781 | 3.669 | 3.614 | 3.583 | 3.318 | 3.319 |
| 0.7 | 3.576 | 3.623 | 3.626 | 3.585 | 3.781 | 3.669 | 3.614 | 3.583 | 3.675 | 3.688 |
| 0.8 | 3.576 | 3.623 | 3.626 | 3.585 | 3.781 | 3.669 | 3.614 | 3.583 | 3.675 | 3.688 |
| 0.9 | 3.576 | 3.623 | 3.626 | 3.585 | 3.781 | 3.669 | 3.614 | 3.583 | 3.675 | 3.688 |
| 1.0 | 3.594 | 3.641 | 3.654 | 3.598 | 3.781 | 3.669 | 3.614 | 3.583 | 3.675 | 3.688 |
| 1.1 | 3.594 | 3.641 | 3.654 | 3.598 | 3.781 | 3.669 | 3.614 | 3.583 | 3.675 | 3.688 |
| 1.2 | 3.594 | 3.641 | 3.654 | 3.598 | 3.808 | 3.693 | 3.637 | 3.592 | 3.675 | 3.688 |
From above table 1 and Figure of description 2, can obviously find out U
5In charging 0.4 (the corresponding existence of charging equipment property time lag) when the 0.5s, voltage swells has arrived 3.781V, and the 0.1s 0.63V that risen only is far above the voltage increasing degree of other joint cells; And during to 1.2s, arrived charge protection voltage, promptly stopped charging.Be connected between cell the 5th joint being described and the 6th saving rosin joint has taken place.
Therefore, the method of detection electric battery rosin joint provided by the invention can be very fast and convenient and can accurately be detected connection faulty soldered joint in the electric battery, and in time find the rosin joint position, electric battery is safeguarded, be not only electric battery and normally use, and can guarantee the application of electric battery safety in electric vehicle.
Claims (5)
1. a method that detects the electric battery rosin joint comprises that n joint cell is through electrode tip substring and/or parallel battery; Electric battery is carried out the charging that electric current is not less than the 2C multiplying power, detect the voltage U of every joint cell simultaneously
iVoltage U when i joint cell
iDuring greater than predetermined value, i.e. i joint cell generation rosin joint; Wherein i, n are natural number, and i is the cell numbering.
2. the method for detection electric battery rosin joint according to claim 1, wherein, described predetermined value is a cell charge protection magnitude of voltage.
3. the method for detection electric battery rosin joint according to claim 1 wherein, is demarcated the extreme electromotive force V of described electric battery negative electricity
1=0V from the negative electricity of electric battery extremely, tests the electromotive force V of the negative electrode terminal of every joint cell successively
n, the tie point of described i joint cell and i+1 joint cell is distributed between adjacent two potential test points, therefore, and U
i=V
I+1-V
i
4. the method for detection electric battery rosin joint according to claim 1 wherein, is demarcated the electromotive force V ' of described electric battery positive electricity end
1=0V from the positive electricity end of electric battery, tests the electromotive force V ' of the anode electrode terminal of every joint cell successively
i, the tie point of described i joint cell and i+1 joint cell is distributed between adjacent two potential test points, therefore, and U '
i=V '
i-V '
I+1
5. according to the method for any described detection electric battery rosin joint among the claim 1-4, wherein, electric battery is carried out electric current more than or equal to the charging of 2C smaller or equal to 3C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910189809 CN102004204B (en) | 2009-08-31 | 2009-08-31 | Method for detecting false solder of battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910189809 CN102004204B (en) | 2009-08-31 | 2009-08-31 | Method for detecting false solder of battery pack |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102004204A true CN102004204A (en) | 2011-04-06 |
| CN102004204B CN102004204B (en) | 2013-01-02 |
Family
ID=43811728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910189809 Active CN102004204B (en) | 2009-08-31 | 2009-08-31 | Method for detecting false solder of battery pack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102004204B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103163463A (en) * | 2011-12-12 | 2013-06-19 | 北汽福田汽车股份有限公司 | Detection method for lithium ion batteries |
| 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 |
| CN105445668A (en) * | 2015-11-25 | 2016-03-30 | 合肥国轩高科动力能源有限公司 | Detection method for lithium power battery module insufficient soldering |
| CN106154181A (en) * | 2016-08-22 | 2016-11-23 | 上海方德尚动新能源科技有限公司 | A kind of battery bag bonding welding detection system and welding and method |
| CN106597297A (en) * | 2016-11-18 | 2017-04-26 | 常州普莱德新能源电池科技有限公司 | Lithium ion battery pseudo soldering detection method |
| CN109093268A (en) * | 2018-06-05 | 2018-12-28 | 湖北锂诺新能源科技有限公司 | Power battery module Laser Welding Quality appraisal procedure |
| CN110361670A (en) * | 2018-03-26 | 2019-10-22 | 株式会社京滨 | Voltage check device |
| CN112666476A (en) * | 2020-12-09 | 2021-04-16 | 北京车和家信息技术有限公司 | Battery connecting piece connection state detection method, device and equipment |
| CN117388740A (en) * | 2023-10-13 | 2024-01-12 | 国科能源(滁州)有限公司 | Method for detecting false welding of battery pack |
-
2009
- 2009-08-31 CN CN 200910189809 patent/CN102004204B/en active Active
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103163463A (en) * | 2011-12-12 | 2013-06-19 | 北汽福田汽车股份有限公司 | Detection method for lithium ion batteries |
| CN103163463B (en) * | 2011-12-12 | 2015-05-20 | 北汽福田汽车股份有限公司 | Detection method for lithium ion batteries |
| 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 |
| CN105445668A (en) * | 2015-11-25 | 2016-03-30 | 合肥国轩高科动力能源有限公司 | Detection method for lithium power battery module insufficient soldering |
| CN106154181A (en) * | 2016-08-22 | 2016-11-23 | 上海方德尚动新能源科技有限公司 | A kind of battery bag bonding welding detection system and welding and method |
| CN106597297A (en) * | 2016-11-18 | 2017-04-26 | 常州普莱德新能源电池科技有限公司 | Lithium ion battery pseudo soldering detection method |
| CN110361670A (en) * | 2018-03-26 | 2019-10-22 | 株式会社京滨 | Voltage check device |
| CN109093268A (en) * | 2018-06-05 | 2018-12-28 | 湖北锂诺新能源科技有限公司 | Power battery module Laser Welding Quality appraisal procedure |
| CN109093268B (en) * | 2018-06-05 | 2019-06-28 | 湖北锂诺新能源科技有限公司 | The method for obtaining power battery module laser welding bonding wire normal voltage |
| CN112666476A (en) * | 2020-12-09 | 2021-04-16 | 北京车和家信息技术有限公司 | Battery connecting piece connection state detection method, device and equipment |
| CN112666476B (en) * | 2020-12-09 | 2024-02-23 | 北京车和家信息技术有限公司 | Method, device and equipment for detecting connection state of battery connecting piece |
| CN117388740A (en) * | 2023-10-13 | 2024-01-12 | 国科能源(滁州)有限公司 | Method for detecting false welding of battery pack |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102004204B (en) | 2013-01-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102004204B (en) | Method for detecting false solder of battery pack | |
| CN101017986B (en) | Balancer in the charging/discharging process of the dynamic battery group | |
| CN203932181U (en) | A kind of stack type lithium battery system | |
| CN205484533U (en) | Battery voltage monitored control system | |
| CN101510698A (en) | Energy-storage system of accumulator | |
| CN209454592U (en) | The protection control circuit of battery pack | |
| KR102160646B1 (en) | The crack detecting method for protection circuit module type of Li ion battery | |
| CN202405763U (en) | Over-discharge protection circuit and battery utilizing same | |
| CN105048571A (en) | Circuit for realizing full-cycle charging and discharging of multiple battery packs and method for circuit | |
| CN105048568A (en) | Circuit and method for solving problems of mutual charging and discharging of multiple battery packs | |
| Dirani et al. | Impact of the current and the temperature variation on the Ni-Cd battery functioning | |
| CN101635342A (en) | Method for fastening connection between pole lug and pole post of lithium ion power battery | |
| CN105048575A (en) | Circuit for solving problem of mutual charging and discharging among multiple battery packs and method thereof | |
| CN105048579A (en) | Method for solving problem of mutual charging and discharging of different battery packs | |
| CN105048017A (en) | Method for solving problem of mutual charging and discharging among multiple battery packs | |
| CN105811444B (en) | A kind of electric vehicle and power grid interactive simulation load system and its electrical protection method | |
| CN104009525A (en) | Intelligent communication type battery charge and discharge optimization control system and method | |
| CN2922233Y (en) | Over-charging protecting circuit for power lithium ion cell | |
| CN209233536U (en) | Compensation circuit, energy-storage system for energy-storage system | |
| CN107369859A (en) | A kind of electric vehicle battery system charging and discharging method | |
| CN202435069U (en) | Battery management system and corresponding electronic system | |
| CN206332439U (en) | A kind of intrinsically safe battery protection circuit | |
| CN111092471A (en) | Use method of overcharge and overdischarge protection circuit for energy storage battery pack | |
| CN220752264U (en) | BMS battery protection board test equipment | |
| CN104362398B (en) | Battery management system and its high pressure Detection ＆ Controling main controller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |