CN104749482A - Method for testing welding reliability of battery core - Google Patents
Method for testing welding reliability of battery core Download PDFInfo
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Abstract
The invention discloses a method for testing welding reliability of a battery core. The method judges if corresponding welding points are abnormally welded according to the temperature change of the welding points to be detected after charging a to-be-detected battery unit for a period of time; the method is very intuitional and convenient; moreover, for every battery unit is configured with a battery management system in assembling, the temperature value and voltage value belong to the extractable data of the battery management system, so the temperature or voltage detection value in the invention can be directly obtained through a temperature collecting line and a voltage collecting line of the battery management system built in the battery unit, and the temperature or voltage detection value is only required to analyze by using the existing data without additionally adding a sensor; the cost is very low, the testing efficiency is high, and the accuracy is also high; meanwhile, the method avoids the damage to the battery unit when the welding reliability test is carried out by strain relief test.
Description
Technical field
The present invention relates to a kind of battery testing technical field, particularly relate to soldering reliability method of testing between a kind of lug of battery battery core and welding.
Background technology
Battery (especially soft-package battery) is in groups time, some battery cores are needed to be stacked, and by each battery pole ear and welding (or positive and negative bus-bar) corresponding mode of welding being realized the series and parallel relation between battery, form an electric battery thus.When welding, because the contact compactedness before lug welds with welding (bus-bar) is subject to many-sided impact, there is certain interval, when welding, missing solder, rosin joint and solder skip phenomenon easily occurring, having had a strong impact on the performance of whole electric battery.
The insecure situation of soft-package battery bond pads mainly produces in weld seam, adopts the method for tensile test at present to the detection method of soldering reliability between soft-package battery lug and bus-bar, uses chest expander to test to the battery after welding.As Chinese Patent Application No. CN201010583528 discloses a kind of fixture for testing of welding tension of battery core, by this fixture, battery battery core is fixedly positioning, ensureing the problems such as battery core there will not be slip, deviate from when testing the welding pulling force of nickel strap on battery battery core, realizing the testing precision of nickel strap welding origin on battery battery core.Chinese Patent Application No. CN201110339931 discloses a kind of weld strength proving installation of lithium ion battery, is also to be measured welding intensity level by fixing battery core recycling tautness meter.The defect of above-mentioned employing pull force test method is: because soft-package battery lug is very soft, and battery in groups after the characteristic such as cannot to dismantle, tensile test belongs to destructive test, the battery doing tensile test cannot continue to use, some welding samples can only be extracted as formulating the use of welding condition, cannot be real-time measure each weld seam and whether weld reliably.
Therefore, how a kind of soft-package battery group lug and bus-bar soldering reliability method of testing are provided, to reach when not damaging battery, between all lugs and bus-bar, the soldering reliability of weld seam all can be tested, and is the current technical issues that need to address of those skilled in the art.
Summary of the invention
The object of this invention is to provide a kind of soldering reliability method of testing of battery battery core, judge the situation whether arbitrary solder joint exists not prison welding and lean on, to avoid causing damage to electric battery when adopting tensile test method to carry out soldering reliability test.
In order to realize above object, the technical solution adopted in the present invention is: a kind of soldering reliability method of testing of battery battery core, mesuring battary group is connected in a charge or discharge loop, after continuing energising one section of setting-up time, measure the temperature change value of this solder joint in the real-time temperature values of solder joint to be measured or conduction time, the real-time temperature values of solder joint to be measured, the absolute value of temperature difference between this solder joint and other each solder joints during arbitrary time point in conduction time, in conduction time this weld point temperature changing value absolute value in, if wherein any one is greater than the setting threshold value of its correspondence, then judge that this solder joint is abnormal welding point.
By measuring real-time temperature values or the temperature change value of corresponding solder joint in conduction time of each cell anode ear and the corresponding solder joint of negative electrode lug in mesuring battary group, accurately to search abnormal welding point in mesuring battary group.
Measure the voltage between the voltage of adjacent two solder joints and corresponding monomer or adjacent two solder joints, if one of them magnitude of voltage is greater than corresponding setting threshold value, then judge to there is abnormal welding point in these two solder joints, more accurately search the abnormal welding point in two solder joints by the temperature conditions of corresponding solder joint.
When mesuring battary group carries out discharge and recharge, the maximum permission that the charging and discharging currents in corresponding charge or discharge loop is not more than the corresponding welding that this electric battery uses with this electric battery passes through electric current.
When mesuring battary group carries out discharge and recharge, its charge-discharge magnification is not less than 1C.
In the charge and discharge process of mesuring battary group, the setting threshold value that in conduction time, during arbitrary time point, between solder joint to be measured with other each solder joints, the absolute value of temperature difference is corresponding is 10 DEG C.
In the charge and discharge process of mesuring battary group, the setting threshold value that in conduction time, the absolute value of weld point temperature changing value to be measured is corresponding is 5 DEG C.
The energising setting-up time of mesuring battary group is 5 ~ 8 minutes.
The soldering reliability method of testing of battery battery core of the present invention judges corresponding solder joint whether abnormal welding by the temperature variation of solder joint to be measured after a period of time that is energized to electric battery to be measured, the method is intuitive and convenient very, and because each electric battery can be equipped with battery management system when assembling, and temperature value and magnitude of voltage belong to the data of must adopting of battery management system, so temperature acquisition line of the battery management system that the acquisition of temperature or voltage detecting value can be carried by electric battery in the present invention, voltage acquisition line directly obtains, do not need additionally to increase sensor, only available data need be utilized to carry out analyzing, cost is very low, testing efficiency is high, accuracy is also higher, avoid when adopting tensile test method to carry out soldering reliability test simultaneously and damage is caused to electric battery.
Can subtest by the detection of magnitude of voltage, the accurate location of abnormal welding point can be realized, substantially increase detection efficiency.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of method of testing of the present invention;
Fig. 2 is for being series battery temperature detection schematic diagram;
Fig. 3 is batteries in parallel connection group temperature detection schematic diagram;
Fig. 4 is the schematic diagram that series battery voltage detects the first embodiment;
Fig. 5 is the schematic diagram that series battery voltage detects the second embodiment;
Fig. 6 is normal battery module voltage curve map;
Fig. 7 is abnormal battery module voltages curve map.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the present invention is described further.
Be illustrated in figure 1 the process flow diagram of the soldering reliability method of testing of battery battery core of the present invention, the method mesuring battary group is connected in a charge or discharge loop, after continuing energising one section of setting-up time, measure the temperature change value of this solder joint in the real-time temperature values of solder joint to be measured or conduction time, the real-time temperature values of solder joint to be measured, the absolute value of temperature difference between this solder joint and other each solder joints during arbitrary time point in conduction time, in conduction time this weld point temperature changing value absolute value in, if wherein any one is greater than the setting threshold value of its correspondence, then judge that this solder joint is abnormal welding point.
Abnormal welding in the embodiment of the present invention mainly refers to rosin joint, namely the situation of loose contact is welded, and for missing solder and solder skip, namely the cell that solder joint is corresponding is not connected in power-on circuit completely, then after energising a period of time, the temperature of this solder joint is without any change, and the temperature change value of this solder joint before and after energising is 0 in other words, can judge that this solder joint exists the situation of missing solder or solder skip thus.Certainly, for series battery, also can carry out by being connected in series a pilot lamp in power circuit the situation whether this electric battery of intuitive judgment exists missing solder or solder skip.
When electric battery with plastic case group is assembled, be generally temperature sensor is arranged on battery cell sidewall on intuitively to measure the temperature variation of cell battery core, but for soft-package battery group, when variation of ambient temperature or abnormal conditions occur, the temperature variation at its lug place is the most obvious, therefore, its temperature sensor is generally the junction being arranged on single battery pole ears and welding, intuitively to observe the temperature variations of cell battery core.
Embodiment 1:
Judged by the real-time temperature values of solder joint to be measured: when environment temperature is certain, if tester rule of thumb or other test conditions preset a temperature threshold, this temperature threshold determines certain in charging and discharging currents, conduction time, so electric battery to be measured is being applied to same charging and discharging currents and after conduction time, if the real time temperature of solder joint to be measured is larger than the threshold value of setting, so can judge that the welding of this solder joint exists abnormal.
Embodiment 2:
By solder joint to be measured within conduction time during arbitrary time point between solder joint to be measured and other each solder joints the absolute value of temperature difference judge: the present embodiment is set in the charge and discharge process of mesuring battary group, the threshold value that in conduction time, the absolute value of weld point temperature changing value to be measured is corresponding is 5 DEG C, that is in mesuring battary group all temperature acquisition points at one time in, the absolute value of the difference of maximum temperature and minimum temperature is no more than 5 DEG C.So when electric battery is by electric current, in group, the temperature of each cell all can change, because the internal resistance of welding rear battery is different, also can difference to some extent by battery temperatures all in synchronization electric battery, when when lateral comparison, between electric battery, the absolute value of temperature difference is less than 5 DEG C, the internal resistance difference in tolerance interval can be thought in technological requirement, when in the temperature and electric battery of somewhere battery, the absolute value of the difference of the temperature of all the other batteries is greater than 5 DEG C, it is abnormal for both can having assert that this place's battery pole ear welded with welding (or bus-bar).
Embodiment 3:
Judged by the absolute value of weld point temperature changing value to be measured in conduction time: be set in the charge and discharge process of mesuring battary group in the present embodiment, the threshold value that in conduction time, during arbitrary time point, between solder joint to be measured with other each solder joints, the absolute value of temperature difference is corresponding is 10 DEG C, and the absolute value of the maximum temperature that is in single temperature acquisition point real time temperature and the difference of minimum temperature is no more than 10 DEG C.Here be consider because season is different, environment temperature is also different, the battery temperature that therefore need not collect judges, but the temperature variation produced in the process passed through at electric current by single battery carries out longitudinal comparison, when when longitudinal comparison, the absolute value of battery temperature difference is less than 10 DEG C, can think that in technological requirement electric current is by fever phenomenon normal during bus-bar, when the absolute value of the temperature difference of somewhere battery is greater than 10 DEG C, it is abnormal for can assert that this place's battery pole ear welds with bus-bar.
Below in conjunction with concrete example, method of testing is described in detail: be illustrated in figure 2 the electric battery that 5 cells are in series, using the total positive pole of the anode ear of 1# battery as electric battery, using the total negative pole (not shown) of the negative electrode lug of last battery as electric battery, the anode ear of the negative electrode lug of 1# battery and 2# battery is welded together by welding, the anode ear of the negative electrode lug of 2# battery and 3# battery is welded together by welding ... each cell is connected and composed series battery in the manner described above successively.Be illustrated in figure 3 the electric battery that the parallel connection of 5 cells is formed, anode ear and positive bus by each cell are weldingly connected, and the negative electrode lug of each cell and negative bus-bar are weldingly connected, thus formation batteries in parallel connection group.No matter be series battery or batteries in parallel connection group, the temperature sensor that all can be arranged by the negative pole lug welding point place of each cell gathers the temperature value of corresponding solder joint, then judges corresponding solder joint whether abnormal welding by above-mentioned several judgment mode.
What more than introduce is the mode judging that whether some solder joints are abnormal, so for an electric battery, wants the position while welding accurately finding abnormal welding, also can be accomplished in several ways, below provide the embodiment that two kinds concrete.
Embodiment 4:
By measuring real-time temperature values or the temperature change value of corresponding solder joint in conduction time of each cell anode ear and the corresponding solder joint of negative electrode lug in mesuring battary group, then the object of accurately searching abnormal welding point in mesuring battary group can be reached in conjunction with above-mentioned several determination methods.
Embodiment 5:
By measuring the voltage between the voltage of adjacent two solder joints and corresponding monomer or adjacent two solder joints, if one of them magnitude of voltage is greater than corresponding setting threshold value, then judge to there is abnormal welding point in these two solder joints, more accurately search the abnormal welding point in two solder joints by the temperature conditions of corresponding solder joint.
The principle of this test mode is: the threshold value that the magnitude of voltage between adjacent two solder joints of the present embodiment setting is corresponding is 20mv, and when that is mesuring battary group is by electric current, in the electric battery of collection, between group, cell voltage pressure reduction is no more than 20mv.Due to the characteristic of soft-package battery, when SOC is consistent, dynamic electric voltage change curve between battery has certain difference, but difference is very little, when its voltage difference is no more than 20mv, standard compliant voltage differences is thought in technological requirement, when there is the situation of lug and welding (bus-bar) abnormal welding in electric battery, the cell voltage profiles change at abnormal welding place is certain and all the other cell voltage profiles are inconsistent, as shown in Figure 6, Figure 7, voltage difference is abnormal more than judging during 20mv that this place's battery pole ear welds with bus-bar.
Mode for measuring voltage also has multiple, and the present invention also provides and is described with under type.
Embodiment 6:
As shown in Figure 4, for series battery, V wherein
1+, V
1-, V
2-, V
3-, V
4-, V
5-be respectively the voltage acquisition line of 1# ~ 5# voltage acquisition point, as seen from the figure, V
1-, V
2-, V
3-, V
4-, V
5-that connection welding belt between each battery is connected, V
1+with V
1-between voltage difference be the voltage of 1# battery self add 1# battery cathode ear solder joint place magnitude of voltage and, if this voltage difference is greater than the threshold value of setting, then clearly can infer that 1# battery cathode ear solder joint place exists abnormal welding.In addition, V
1-with V
2-between the voltage difference voltage that is 2# battery self add the magnitude of voltage at 2# battery positive and negative lug two solder joint place and, V
2-with V
3-between the voltage difference voltage that is 2# battery self add the magnitude of voltage at 2# battery positive and negative lug two solder joint place and ... following formula can be obtained: V according to above-mentioned analysis
(n-1)--V
n-1=V
n, i.e. V
(n-1)-with V
n-between difference V
nvoltage for n# battery self add the magnitude of voltage at n# battery positive and negative lug two solder joint place and, so can know by inference, if V
nbe greater than the threshold value of setting, or V
1~ V
nbetween the absolute value of difference of any two values be greater than corresponding setting threshold value (being equivalent to the 20mv in embodiment 5), then can judge that two solder joints at the n-th battery plus-negative plate ear place exist abnormal welding, this just reduces test specification greatly, more accurately searches the abnormal welding point in two solder joints in conjunction with the temperature conditions of these two solder joints.
Embodiment 7:
As shown in Figure 5, still for series battery, wherein V
1+, V
1-, V
2+, V
2-, V
3+, V
3-, V
4+, V
4-, V
5+, V
5-be respectively the voltage acquisition line of the positive and negative lug voltage acquisition point of each battery of 1# ~ 5#, as seen from the figure, compared with embodiment 6, each voltage acquisition line of the present embodiment is connected with each battery plus-negative plate ear, instead of to be connected with welding, this acquisition mode by directly gathering the voltage between two lugs (these two lugs correspond to different cells) corresponding to each welding, also can be realized by the pressure reduction between adjacent cell, such as gathering V
1+with V
2+between voltage or V
1-with V
2-between voltage, V
1+with V
2+between voltage be the voltage of 1# battery self add 1# battery cathode ear, 2# anode ear solder joint place magnitude of voltage and, V
1-with V
2-between voltage be the voltage of 2# battery self add 1# battery cathode ear, 2# anode ear solder joint place magnitude of voltage and ... following formula can be obtained: V according to above-mentioned analysis
(n-1)+-V
n+=V
n-1', i.e. V
(n-1)+with V
n+between voltage difference V
n-1' for the voltage of (n-1) # battery self add (n-1) # battery cathode ear, n# anode ear solder joint place magnitude of voltage and, or V
(n-1)--V
n-=V
n", i.e. V
(n-1)-with V
n-between voltage difference V
n" voltage for n# battery self add (n-1) # battery cathode ear, n# anode ear solder joint place magnitude of voltage and, so can know by inference, if V
n-1' or V
n" be greater than the threshold value of setting, or V
1' ~ V
n-1' between the absolute value of difference of any two values be greater than corresponding setting threshold value (being equivalent to the 20mv in embodiment 5), or V
1" ~ V
n" between the absolute value (being equivalent to the 20mv in embodiment 5) of difference of any two values; then can judge that two solder joints at the n-th battery plus-negative plate ear place exist abnormal welding; this just reduces test specification greatly, more accurately search the abnormal welding point in two solder joints in conjunction with the temperature conditions of these two solder joints.
In addition, in order to prevent, electric current is excessive to be impacted battery performance, and in order to prevent electric current from crossing ambassador's welding or bus-bar generation potential safety hazard, when mesuring battary group carries out discharge and recharge, the maximum permission that charging and discharging currents in corresponding charge circuit or discharge loop is not more than the corresponding welding that this electric battery and this electric battery use passes through electric current, and its charge-discharge magnification is not less than 1C, if electric current is too small, in charge or discharge process, change in voltage can be not obvious, temperature variation is also not obvious, and the present embodiment generally adopts 1C ~ 1.5C; And conduction time is generally set as 5 ~ 8 minutes.
After checking out abnormal welding by said method, corresponding remedial measures need be taked to electric battery, all welds of electric battery can normally be used.And after the measure of reparation abnormal welding, again can be retested by said method, fully ensure that the electric battery after reparation again abnormal welding does not occur.
The principle of the method for testing in the present invention is as follows: when the electric current in electric battery power circuit is by weld seam, if the welding of weld seam is unreliable, the abnormal welding such as such as rosin joint, so the internal resistance of this exception will increase, now electric current is by producing following phenomenon: the surface temperature of (1) this exception raises obviously, within more than 5 minutes, can find out obvious difference; (2) the cell voltage change of this exception differs from other cell voltages in electric battery, the voltage curve carried by battery management system can be known and find out intuitively, and the cell voltage profiles flex point of this exception differs from other cell voltage profiles flex points in electric battery.Can judge whether there is in soft-package battery group the insecure weld seam of welding by above two kinds of criterion, and battery temperature value that can be specifically abnormal according to the observation, voltage accurately find the position while welding of abnormal welding, the damage that the method can avoid physical testing to cause lug.
Above embodiment only understands core concept of the present invention for helping; the present invention can not be limited with this; for those skilled in the art; every according to thought of the present invention; the present invention is modified or equivalent replacement; any change done in specific embodiments and applications, all should be included within protection scope of the present invention.
Claims (8)
1. the soldering reliability method of testing of a battery battery core, it is characterized in that: mesuring battary group is connected in a charge or discharge loop, after continuing energising one section of setting-up time, measure the temperature change value of this solder joint in the real-time temperature values of solder joint to be measured or conduction time, the real-time temperature values of solder joint to be measured, the absolute value of temperature difference between this solder joint and other each solder joints during arbitrary time point in conduction time, in conduction time this weld point temperature changing value absolute value in, if wherein any one is greater than the setting threshold value of its correspondence, then judge that this solder joint is abnormal welding point.
2. the soldering reliability method of testing of battery battery core according to claim 1, it is characterized in that: by measuring real-time temperature values or the temperature change value of corresponding solder joint in conduction time of each cell anode ear and the corresponding solder joint of negative electrode lug in mesuring battary group, accurately to search abnormal welding point in mesuring battary group.
3. the soldering reliability method of testing of battery battery core according to claim 1, it is characterized in that: measure the voltage between the voltage of adjacent two solder joints and corresponding monomer or adjacent two solder joints, if one of them magnitude of voltage is greater than corresponding setting threshold value, then judge to there is abnormal welding point in these two solder joints, more accurately search the abnormal welding point in two solder joints by the temperature conditions of corresponding solder joint.
4. the soldering reliability method of testing of battery battery core according to claim 1, it is characterized in that: when mesuring battary group carries out discharge and recharge, the maximum permission that the charging and discharging currents in corresponding charge or discharge loop is not more than the corresponding welding that this electric battery uses with this electric battery passes through electric current.
5. the soldering reliability method of testing of battery battery core according to claim 4, is characterized in that: when mesuring battary group carries out discharge and recharge, its charge-discharge magnification is not less than 1C.
6. the soldering reliability method of testing of battery battery core according to claim 1, it is characterized in that: in the charge and discharge process of mesuring battary group, the setting threshold value that in conduction time, during arbitrary time point, between solder joint to be measured with other each solder joints, the absolute value of temperature difference is corresponding is 10 DEG C.
7. the soldering reliability method of testing of battery battery core according to claim 1, is characterized in that: in the charge and discharge process of mesuring battary group, the setting threshold value that in conduction time, the absolute value of weld point temperature changing value to be measured is corresponding is 5 DEG C.
8. the soldering reliability method of testing of battery battery core according to claim 1, is characterized in that: the energising setting-up time of mesuring battary group is 5 ~ 8 minutes.
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