The safety of the battery system is partly the safety of the battery core, part of it is thermal safety, then mechanical safety, electrical safety, and functional safety.
The so-called safety refers to the use of this material to make batteries, in the environment of abuse, such as overcharge, over discharge, extrusion, over temperature, etc., the system can maintain a relatively stable, not There is a state of thermal runaway.
The quality system also plays a very important role here.
If there is no strict quality system to control this set of things, even if you have the best materials, even the best chemical ratio produces the battery, its quality will be problematic, and the safety of the system you produce will also have problem.
How can thermal safety be avoided? When one of the cells is thermally out of control, the other cells next to it are not affected. Overcharge, the currently designed system has at least two protections when it is overcharged, and the software layer protects. When the voltage reaches a certain level, the software needs to perform short electrodes, and the hardware also needs to perform short electrodes. The design result of the concept of safety setting is one aspect of the quality system.
In other words, this reason can be controlled, if your system is doing well, if your quality system is doing well.
If the former solves the fundamental problem of the real cause through the quality system, it will be very small to do the work behind it, and the investment in the cost of the battery system will be small, which will have a great effect on the sustainable development of the industry.
For example, in terms of functional safety, the entire system design should initially consider how the functional safety is to ensure the system from the system level. When various problems occur, the control system can solve this problem. Give this problem to it before it happens.
Mechanical design can be designed with a variety of simulations to ensure that your mechanical system does not have a major impact on the battery when it is hit, thermal management fuse design, and finally thermal runaway diffusion technology to ensure.
The so-called seal safety problem is that now design a battery pack, the seal is done well, sinking into the water tank can be achieved.
The so-called electrical safety, electrical causes actually cause a lot of problems are the so-called insulation failure, the adhesion of the machine and the internal connection is not good, resulting in thermal runaway problems in local heating. In fact, many of these problems can be eliminated by the quality system to avoid such problems.
For example, the problem is that when the relay is connected to the Pak, such a large relay places dozens of wires here, each wire is very close to each wire, and does not meet the gap and creepage distance requirements at all. In addition, after using seven or eight years, there are a lot of embarrassing things sticking on the line, which causes the insulation of the line to be a problem.
If you are like this kind of thing, you can think about it at the beginning of the design. If there are strict internal specifications, what the creepage distance and gap should be, these problems can be completely avoided. But if you don't have such a quality system, you can't do it. There is also the adhesion of the relay. If there is a clear relay to match the standard of such fatigue testing, this problem can also be solved. So I said that through the complete quality system, electrical safety can also play a big role.
The so-called functional safety, in fact, this is a problem that must be considered for the system of the automakers, but the work done in the battery industry is a step backward compared to the OEM. If many European and American OEMs and domestically leading OEMs have already regarded functional safety as a very important task.
A123 quality development process, APQP process, this process is really important to ensure your quality system is very important.
Different deliverables ensure that these things go smoothly during the product development process, which is an important process. In fact, the risk of battery system safety can be largely avoided. The APQP process is a core part of the entire quality system.
Finally, if the industry wants to be sustainable, the quality system is very, very important. This is the basis for us to fundamentally compete with our competitors and our foreign competitors. If there is no such thing. If you go over-emphasis on certain technical details, it may make us somewhat biased. 
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