First look at the high-voltage power distribution box, referred to as PDU (Power DistribuTIon Unit), the high-voltage power distribution unit in the high-voltage system solution of new energy vehicles. The high-voltage components are electrically connected through busbars and wiring harnesses to provide functions such as charge and discharge control, high-voltage component power-on control, circuit overload short-circuit protection, high-voltage sampling, and low-voltage control for the high-voltage system of new energy vehicles to protect and monitor the operation of the high-voltage system .
PDU can also integrate BMS main control, charging module, DC module, PTC control module and other functions. Compared with traditional PDU, it has more vehicle functional modules, which is more functionally integrated and more complex in structure, with water cooling or air cooling. Heat dissipation structure. PDU configuration is flexible, can be customized development according to customer requirements, to meet the needs of different customers and different models. BDU (Battery Disconnect Unit) battery pack disconnect unit is designed for the interior of the battery pack and is also a type of high-voltage power distribution box.
Various PDUs on the market:
PDU market demand analysis, the following picture is my Datianchao's new energy vehicle sales trend chart. Looking at a car matching a PDU, everyone knows how much it has. Calculating with the market price of 3000-6000 yuan, we know how big the market of the entire PDU is!
From January to November 2017, Datianchao's passenger car sales totaled 476,600 units, a year-on-year increase of 64.4%. See the chart below. Dear friends, what models and OEMs does your PDU get?
Technical requirements and prospects
1. Adopt cast aluminum shell and Connectors, the protection level reaches IP67.
2. With current and voltage acquisition function.
3. Real-time monitoring of high voltage connection status and insulation status.
4. Manage high-voltage safety, with over-current, over-voltage and over-temperature protection functions.
5. Manage high-voltage power distribution to achieve separate control of each output.
6. When the vehicle collides and rolls over, it has the function of cutting off the high voltage.
7. With CAN communication function, exchange data in real time.
8. Solve the technical problems of vehicle integration, advanced intelligent diagnosis and power management.
9. Improve the safety performance of electrical systems and the reliability of high-voltage power distribution systems.
10. The EMC level is getting higher and higher. The next step is to achieve class5 level.
Types of major PDU players in the existing market:
1. Manufacturers producing PDU core devices (high-voltage connectors): such as XE, X Feno, X Aviation Optoelectronics, X Expensive, X Spa, X Da, X Ni, X Green, X Da, Rong X, X Seoul, etc. Basically all PDUs are developed, but it is only a matter of the size of the market share.
As the high-voltage connector is used as the contact point of the high-voltage system of the entire new energy vehicle, it is almost bundled with high-voltage wiring harnesses. This type of player is very worthy of attention.
2. Manufacturers of PDU core devices (high voltage contactors), such as X hair and X force, Hong X and Guo X, which have produced high voltage contactors, have established subsidiaries to produce PDUs; or tie your own good partners, you got it!
The cost proportion of high-voltage contactors accounts for about 20-30% of the cost of the entire PDU, and is the core gas piece. Such manufacturers have joined the PDU army; Suzhou Anlaiqiang Electronics is also on the way to catch up.
3. Traditional motor electronic control manufacturers have developed earlier, such as Pin X, Hui X, Xinrui X, etc.; similarly, DCDC/ACDC manufacturers have also rushed. Among them, Pin X insists on using PCB copper to integrate the internal high-voltage system. As a technical selling point, can it only withstand the rising cost pressure?
4. Enterprises that are closely related to the OEM: such as Hai X Electronic Control, etc.
5. Some companies doing PACK and BMS, such as CXTL, etc.
6. Some companies that make PDU cabinets take advantage of the speed of sample delivery, and also get a slice of the cake.
7. Other capital players, etc.
Difficulties and pain points of PDU market:
From the above, it is not difficult to see that from the technical door, PDU is not technically difficult. It is a bit embarrassing to mix with new energy car friends when it is said that it is impossible to develop PDU as a new energy vehicle component. There are many players, but in fact, there are not many who can really do well. This is one of them;
Second, the product quality risk is high. Because the PDU integrates the two high-voltage protection and loss parts in the high-voltage system, the fuse and the high-voltage contactor (fuse, personally considered to be a wearing part), regardless of whether the gas part itself is abnormal, or Other abnormalities are basically reflected in these two types of gas parts, such as fuse fuse, high-voltage contactor adhesion, etc., the quality of the product itself, other abnormalities will also be reflected on the PDU;
Third, it is a component of the high-voltage system, which makes quality management difficult; for example, thousands of PDUs produced by the TX company for Ji X Automobile were inspected for missing screws, resulting in the recall of the entire batch of products;
Fourth, the price is transparent and continues to go down; the core gas parts of the product, such as high-voltage contactors, fuses, high-voltage connectors, etc., become transparent, and the price of PDUs continues to decline; it can be said that they are selling white powder and earning It must be cabbage money.
Faced with many masters, how to get a slice of the soup in the huge PDU market? Especially latecomers.
From the perspective of the market, everyone can play this product. It does not mean that everyone has the determination and ability to make the product the ultimate. PDU is also a process of scouring the sand. This is one of them;
Second, it is best to have core products and technologies as the selling point of the market, such as being able to develop or control high-voltage connectors, or high-voltage contactors, or at least a good friend with such gas parts;
Third, a good quality control system and quality anti-risk capabilities, such as component and process traceability systems, etc.;
Fourth, the road is simple, less process means less quality risk of a process, from the above design, manufacturing, gas parts selection, etc. as simple as possible; this type of product is not the pursuit of advanced, but the stability of the product;
Fifth, the necessary technical ideas and innovative thinking. For example, in the previous MSD, a company proposed the concept of QCD and put it into action, and obtained good market feedback. Qing Qingjun boldly imagined: Can this design concept be used on PDU?
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