NineSights里面一些与电池有关的设计需求

 在Nine Sights里面的有关电池的引用的一些需求描述，和之前那个BMW的类似，从需求端来说写的还是不错的。从2016年至今，有不少的选题其实是我们一直在研究的：

1）Battery Pack with Balancing Electronics

2）Safety Technology of Lithium-Ion Battery for Vehicles

3）Lithium-Ion Battery Modeling For Safety Verification

4）Develop a Process to Inspect Welds During Battery Manufacturing

5）Thermal Management of a Battery System

6）High Current Connection for Batteries

     在这些里面首先从电连接开始谈，这个项目是2016年提的，已经过期

具体的技术要求为

• 这个电流现在看下来有些偏低Max current 400A (~10ms)
  

• Resistance < 0.1mOhm

• Lifetime ~ 15years

• Temperature stable -40°C to +85°C

• Joining or Pressfit components

• <1 Euro per part

• Ideally fit following sizes

• Cell to cell size =  5mm

• Module to module size = 100mm

• Detachable > 5 times

• Environmentally friendly materials

可行的考虑点为：

• New materials for Al / Cu electrode endpoints 

• New Pressfit / joining technologies 

• Low resistance clips / fixers 

• New design concepts

2）锂电池失效模式分析

Developing a LIB simulation model based on big data collected through a development, production or failure-analysis of the actual LIB products. Developing the LIB safety verification model that incorporates chemistry perspectives into consideration.

技术要求

Can simulate not only behaviors of LIB at charging or discharging under ordinary use but also at least one of the following mechanisms of internal shorts in the LIB, which may cause firing of the LIB:

• 内短路发生机理Occurrence mechanism of internal shorts
  

• 内短路发生之后的链式反应机理Chain mechanism where thermos runaway is caused by internal shorts

• 导致内短路的退化机理Degradation mechanism and how such a degradation causes internal shorts

• 由于制程差异导致的内短路机理How property variation due to manufacturing process causes internal shorts

Models of the entire LIB system are ideal but models of individual LIB cells are also welcomed.

Simply an equivalent circuit model

Simply a look up table comprised of measured data

需要仿真的机理

• occurrence of internal shorts 

• thermos runaway caused by internal shorts

• internal shorts caused by internal degradation

• internal shorts caused by production or characteristics variation
  

      把这些研究的点，切开成一个个课题，找到不同的办法，然后再进行组合，效果还是在集中研发的效果要更好一些。这种聚合的形式，特别是征求合作和意向，某种程度也是汽车产业里面比较缺少的。有点从Concept阶段一步步帮着金主去做工程试验，去做一些试错。

小结：在依赖供应商的阶段，把现在把每一项课题的要求写成SOR，而随着自己去做设计或者做整体解决方案，就需要把大部分技术点分成需要实现的要点予以分解和细化，把在不同地方用过的可行的导入到汽车行业里面来，我觉得兼收并蓄的方式是汽车零部件技术演进和发展的关键。