Single-cell short-circuit test: According to the requirements of GBT31485, the short-circuit resistance is <5 milliohms and the time is 10 minutes. It is actually necessary to increase the simulation of this situation based on the minimum cell connection of the battery.
Discussing the recent work priorities with the boss, the ability to make some achievements in the short term is mainly concentrated on the electrical system. So starting from high-voltage harnesses, electronically controlled hardware circuits, power distribution boxes, and some strategic content, I will sort out the simple content and then apply it further into the work. As shown in the figure below, the influence inside the electrical system is quite large, and many of the contents are also in the design process of the battery system, and the electrical part needs to be designed and tolerated.
Figure 1 Some problems in the electrical level of the battery system
As stated in the previous table, short-circuit/overcurrent strictly means that each level (single, module, half-pack, and battery package) exceeds the rated discharge design.
Table 1 function failure problem
Figure 2 Short-circuit requirements for each level
Battery system short circuit test: According to GBT31476.3, short circuit resistance <20 milliohms, short circuit for 10 minutes.
MSD Breaking Half-Pack Test: This content mainly considers an extreme situation, and looks at the entire design under the condition that the system fuse does not work in the MSD.
Short-circuit test of the module: According to the requirements of GBT31485, the short-circuit resistance is <5 milliohms and the time is 10 minutes.
Single-cell short-circuit test: According to the requirements of GBT31485, the short-circuit resistance is <5 milliohms and the time is 10 minutes. It is actually necessary to increase the simulation of this situation based on the minimum cell connection of the battery.
Table 2 Existing domestic and international standards and future GB
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