2018年04月14日 | Bolt EV电芯出现故障可能会导致车辆瞬间失去动力

2017年4月份，有部分Bolt EV的电池被报道出问题：“2017 Chevy Bolt EV battery may fail due to faulty cell; new pack needed for a few GM electric cars”，现在进一步扩大了，事情变得有些大条了。

部分2017年型号的Bolt EV电芯出现故障，当这个故障发生的时候，可能会导致车辆瞬间失去动力，没办法有效驱动，在高速道路上，这个事情可能会非常危险。这里有几点值得考虑：

部分电芯的衰减比较快

部分电芯在后期会突然跳水

采取措施：通用汽车一直在通过其OnStar 的车辆网程序监控这个问题，通过车辆网收集电池的实时数据和BMS计算出来的电池的健康状况，现在的问题是，车联网本身追踪也不能完全覆盖所有的潜在失效，对于通用来说，Bolt的部分车型是个大问题。

有些广告要给拿出来比一比，在某些情况下，非预设性的诊断覆盖的东西，车联网没办法。

如下图所示，这是车主在车辆论坛里面吐槽

I've had the car for about2 months now (Purchased 9/30)and today while driving on the freeway home I got a message saying Loss of Propulsion. I noticed that the car was only allowing around30kwh of power to be dischargedeven when I mash the throttle down. I exit the freeway and proceed to try to make it home thinking I'd be able to make it as it's about a mile or so down the road.I come to a complete halt at a stop light and proceed to accelerate normally when the light turns green and I noticed the limit on battery discharging again and hit a max speed of around 45 miles an hour. 

Stop for another red light and this time it is a big hill so I tried to accelerate as hard as possible to make it up the hill and I make it to about 30mph before the screen starts throwing up error messages andI notice my battery level go from around 40 miles(25% battery) down to 29 miles left and into the orange and then rapidly declining to 0followed by more error messages of battery is drained and I am now stuck on the side of the road. 

With 0 miles left and no drive to the wheels I do my best to pull over to the side and use OnStar to call for assistance. They call a tow truck which took about an hour to get there and now the car is sitting at the dealer because service isn't open. I sure hope it is dealt with quickly and a rental car provided. 

Notes: Car was manufactured in August 2017 so if it is a battery failure that is certainly not a good sign for everyone with bolts older than that. Torontonian69 likes this.

从以上的现象来看，这个N2.1系列的电芯，反应还是真奇怪，一放电本身的特性就出现大问题，触发BMS的故障，等恢复一加负载又跳水。这下损失可不小呢

When a cell "fails", its voltage tends to drop off very quickly, especially compared to other cells. Once the system detects the voltage of ANY SINGLE cell group is below minimum, it shuts down to protect the cells from over discharge. Obviously, if the battery is at 50% SOC and then suddenly a single cell drops to Vmin, then that cell is already damaged. This is why you get no warning. The new software must be more sensitive to detecting this. This is the equivalent of your phone shutting down during heavy use.  I recommend anyone covered by this recall run your battery DOWN to 10% to maximize the chance of finding this fault. Staying at 90-100% SOC is not going to help the battery, but rather mask this problem.

电动汽车产业里面，这大概是第一个因为电芯问题，导致的召回，往前走，步步惊心，如履薄冰。成本还要降呢