Method for detecting connection quality of busbar in series circuit in new energy lithium battery pack
A series circuit and connection quality technology, which is applied in the field of detecting the bus connection quality in the series circuit in the new energy lithium battery pack, can solve the problem of increasing the integration cost of the battery pack system, the difficulty in obtaining the quality of the bus bar, increasing the volume of the battery pack system and Integration difficulty and other issues, to achieve the effect of increasing integration difficulty and cost
Pending Publication Date: 2020-09-15
SHANGHAI POWERSHARE TECH LTD
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Problems solved by technology
Patent Publication No. 206208240U provides a method for detecting the gap between tabs and busbars through equipment; the gap between busbars and connectors is usually very small or even zero, which requires the equipment to have extremely high detection accuracy. It is difficult to obtain accurate bus quality through this method; Patent Application No. 201910168145.5 proposes a method of using a control circuit to detect bus bars, which can effectively detect each bus bar in real time; Adding a lot of circuit components will increase the integration cost of the battery pack system, and will increase the volume and integration difficulty of the battery pack system
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[0021] Below in conjunction with the embodiment shown in the accompanying drawings, the present invention is described in detail as follows:
[0022] Such as figure 1 shown
[0023] A method for detecting the connection quality of a bus bar in a series circuit in a new energy lithium battery pack, comprising the following steps:
[0024] a: Take out the battery pack that needs to detect the connection quality of the bus bar, so that the bus bar is exposed;
[0025] b: Discharge the battery pack at a constant current of 1C to its cut-off voltage, and set aside Tmin;
[0026] c: Charge the battery pack with a constant current of 1C, measure the terminal voltage at both ends of each busbar in the series circuit during the charging process, and the terminal voltage of the xth busbar is Vx;
[0027] d: Discard the maximum and minimum values of the terminal voltages of the above-mentioned busbars, and calculate the average value of the remaining terminal voltage values, which a...
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The invention provides a method for detecting the connection quality of busbars in a series circuit in a new energy lithium battery pack. The method comprises the following steps: exposing busbars ofa battery pack; discharging the battery pack to a cut-off voltage according to IE; charging the battery pack with IE, and measuring the terminal voltage at the two ends of a busbar in the circuit, theterminal voltage of the xth busbar being Vx; rejecting the maximum value and the minimum value of the terminal voltage in each busbar, calculating the average value of the remaining terminal voltagevalues, and recording the average value as V average; calculating the average Ex of the terminal voltage Vx and V of each busbar, wherein Ex = | Vx-V average | / V average, wherein the difference Ex control range is not greater than delta E; calculating Ex corresponding to each busbar one by one, and when Ex is smaller than or equal to delta E, judging that the number x busbar is well connected; otherwise, if the Ex is greater than the delta E, judging that the connection of the x busbar is abnormal. Data representation can be carried out on the busbar quality, the busbar quality problem can beeffectively screened, and the integration difficulty and cost of the battery pack cannot be increased.
Description
technical field [0001] The invention belongs to the technical field of batteries, and in particular 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 technique [0002] Only when the bus bars in the new energy battery pack are reliably connected can the effective transmission of current be guaranteed. Once the bus connection fails, it is easy to cause a large amount of heat to be generated at the abnormal connection, which will lead to faster aging and attenuation of the battery, and even cause the power battery to catch fire in extreme cases. Therefore, detecting and controlling the connection quality of the bus bars in the battery pack is crucial to the performance and safety of the battery pack. Patent Publication No. 206208240U provides a method for detecting the gap between tabs and busbars through equipment; the gap between busbars and connectors is usually very small or even zero...
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Login to View More IPC IPC(8): G01R31/36G01R31/367G01R31/396
CPCG01R31/36G01R31/367G01R31/396
Inventor 柯鹏许海涛钱磊朱卓敏
Owner SHANGHAI POWERSHARE TECH LTD