What is the root cause of the new energy vehicle power lithium-ion battery safety hazard?

　　Author ：Iflowpower – Portable Power Station Supplier

On June 27, it was publicly expressed that because some vehicles had battery thermal out-of control and fire hidden dangers, 4803 ES8 electric vehicles will recall for them to replace the improved power lithium-ion battery pack to eliminate safety hazards. ES8 is the first mass production model, which is also the first batch delivery of the "New Force" in China. As of April 30 this year, it has delivered 16,461 units.

This recall, at least 30% of the ES8 that has been delivered will be affected. In addition, it is also said that all of its battery circulation systems have all security risks will be replaced. In order to solve the user's "mileage anxiety", it is also available in a conventional charging system, but also serves a battery at a specific site, so there is a "circulation" battery in the market.

The recovery technology and the accumulation of services have brought convenience to the aware recall work, and on the other hand, the workload of the battery recall is also increased. The 21st century economic report reporter learned that the current power saving station in the city is basically not open to the outside, and the recall of the entire battery and the vehicle is expected to carry out two months. Earlier, it was repeatedly involved in the fire, and the negative rumors of smoke.

The active recall was regarded by many people as a responsible and active performance. However, compared to recall, the original battery is the focus of consumers and industry insiders. According to it, the battery pack is thermostat and the risk of the fire comes from the module, and there is a case where the voltage sampling wire harness of the module may be extruded by it, and there is a fire risk in extreme cases.

Available battery module supplier is Ningde Times. Ningde Times is the first power lithium-ion battery system supplier in the world's sales, which is not only the first quantity of the best, but also has different degrees of cooperation with many car companies, and is known as the "unicorn" category of dynamic lithium-ion batteries. ".

However, Ningde Times did not recognize that there is a safety hazard in the module, but it means that "there is interference in battery pack and module structure, and there may be safety hazards under certain extreme conditions. "From two demonstrations, the two sides of the Tingde did not reach a consensus on the risk point, and it was aware of the quality problems of the module, and the Ningde Times believed that the module quality passed, the problem is the adaptation of the module and battery pack. It should be pointed out that in the cooperation with the Ningde Times, the assembly of the battery pack and module is responsible for it.

Two is completely inconsistent, showing the source of battery safety hidden dangers. In the multi-battery industry, the reporter of the 21st century economy said that from the current information is not good, it is the responsibility of the Ningde Times, both sides will lock the focus on the module, but exactly the module or the module No matter what to know. There are industry insiders to decompose, and the commonality in the Time Times is, the short circuit caused by causing the risks of the battery is extrusion and wear, while the long-width high of the battery pack is three latitude, modules and boxes The gap of the body is quite compact.

However, there is also a question. Since it is a problem with each other in the module and the box, it should be a relative space according to the common sense, eliminating interference, or shrinking the module, either a large box, but there is no need to replace the module, can only explain " Ten eight nine is the problem of the module ". It is worth mentioning that in the second day of the recall, Tesla also issued a self-ignition incident in Shanghai in late April, which is the same as the module failure.

Tesla is the same as it, due to frequent vehicle fire incidents have received attention, plus them from new companies in traditional vehicle enterprises, and amplifying people's safety concerns about their products. However, Tesla did not explain that the battery module has a detailed failure. But Tesla's question "simple", because Tesla battery module is processed by ourselves, and its battery supplier is only responsible for supplying electrical cells.

It is not difficult to find from the above-mentioned propulsions and Tesla. With the electric development trend of the automotive industry, the automotive industry chain is also a profound change. Taking a powerful lithium-ion battery as an example, upstream battery manufacturers are becoming the most important suppliers of automotive industries, but there is a relatively complex cooperative model between vehicle enterprises and battery manufacturers.

This also brought difficult to the responsibility of both sides. These three modes, the connection between battery products and battery suppliers gradually weaken, and from another perspective, the technical requirements of the vehicle enterprises are gradually improved. In the new car company, there are many companies in order to better carry out cost-controlled control, and they are more integrated by the battery category, typical examples are Tesla, which only receives the battery, starting from the module.

It is our own research and development, and it is often emphasized that the technology accumulated in "three electric" categories. It should be pointed out that Tesla is even further further in battery development. Some news shows that Tesla is stepping up the R & D battery, hoping to reduce the battery supply to the Panasonic, and significantly reduce costs.

In fact, in the cooperation between the vehicle enterprises and battery manufacturers, there are also games. "In the context of technology relatively unsuccessful, vehicle enterprises often face new options: Do you want to do this?" Electric car battery decomposition master, Luo Lanberg Director said to reporters, car, try to break through While multi-technical nodes, it also means that there are more superimposed on the main plant and suppliers on the value chain layout. "The power lithium-ion battery is a high barrier, but when this technology is highly mastered in the hands of the vehicle factory, the battery manufacturer is not a way to grasp its safety border.

"A dynamic lithium-ion battery industry said that he believes that battery manufacturers should have more discourse rights in the professional category. The awareness of this is also inadvertently demonstrating that there is no "translucent" in the electric car industry chain, such as the design leadership of the vehicle factory and suppliers in the core components. This recall may once again cause reflection of the division of labor of the industry chain, and it may also be able to further enhance the importance of these links.