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Blind and buried via circuit board: detailed knowledge of power battery safety

Blind and buried via circuit board: detailed knowledge of power battery safety

  • Categories:Industry News
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  • Time of issue:2020-09-17 16:20
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Blind and buried via circuit board: detailed knowledge of power battery safety

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The core of the blind and buried via circuit board of the power battery is the safety issue, which is the most difficult and thorny issue among all contradictions. Security is a very complex system, involving all aspects, energy density, cycling, fast charging, cost, etc. are all complex hybrid systems, which are quite complex links.


  Lithium battery is a device for storing energy, which is divided into two parts: one is reversible conversion, and the other is reversible at both ends of charge and discharge. The second is its own energy consumption, which can release heat in the oxidation reaction.


  Under normal working conditions of the battery, the charging and discharging or energy conversion speed of the battery is controllable, but the energy is in the form of electricity. If the short circuit, the energy release rate is very fast, which will lead to a large amount of heat accumulation. When the speed reaches When it cannot be controlled, explosions and fires will occur, which is the root cause of safety accidents caused by lithium batteries.


  There is a trigger mechanism in which the heat of the battery's blind buried via circuit board is out of control. The trigger mechanism has several stages. First of all, the anode material itself decomposes, and the anode material generates heat, which in turn causes the entire energy release to go out of control, and the battery explodes and catches fire. How to prevent battery thermal runaway? The circuit board factory believes that the first choice is the choice of raw materials, and try to choose high-level safety or materials that release less energy to make batteries. In addition, from the perspective of battery design, most battery safety accidents are caused by battery defects. Safety is a system engineering, it is not only a material link, from the battery system materials to the entire battery packaging, and then to the battery use link.


  From raw materials to battery components, BAK cylindrical batteries have made a comprehensive breakthrough in safety. In the battery package, 28 batteries are randomly selected to detonate once. After the battery was detonated, the impact of the entire thermal system and the vehicle was satisfactorily evaluated.


  What factors affect the safety of blind buried vias for power batteries?


  The battery pack needs to ensure that the battery pack is still in good condition and can still operate normally in the event that the battery is out of control. Any single battery will lose heat control, and the battery pack still has a normal voltage. In the vehicle, any battery will not burn out after a safety accident, and it can continue to run, and the driver needs to be reminded to drive to the 4S store for maintenance.


  As for the relationship between battery performance and safety, high energy density is very worthy of attention. HDI board factory believes that there are two directions for high energy density. One is to choose some new materials, and now more are high nickel + silicon materials, and the other is to provide more materials and more energy in a limited space. Due to the application of high nickel + silicon materials, the thermal energy of new energy vehicles has dropped from the initial trivalent nickel content to the current eight valent nickel content.

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The evaluation system of the circuit board factory should follow the following principles

The evaluation system of the circuit board factory should follow the following principles

Establishing a good cooperative relationship with circuit board factories is conducive to cost reduction, response time reduction and the creation of new market value, etc. The core issue is how to choose the ideal circuit board factory. There are many factors involved in the evaluation of circuit board factories, and the evaluation index systems are diverse, both qualitative and quantitative, and the index weights are also different. Therefore, it is necessary to establish a universal and expandable evaluation index system for circuit board factories. , And the indicator system should follow the following principles:
The use of soft and hard circuit boards?

The use of soft and hard circuit boards?

In our daily life, circuit boards are mostly single-sided, double-sided, or multi-layer boards, rigid boards, metal-based circuit boards, aluminum, copper substrates, thermally conductive fiberboards, etc., do you know what a flexible and rigid circuit board is? Rigid-flex circuit board: refers to a special circuit board made by pressing a rigid circuit board (PCB) and a flexible circuit board (FPC). The main board materials used are rigid board FR4 and flexible board polyimide (PI). Rigid and flexible circuit boards combine the rigid characteristics of rigid circuit boards and the advantages of flexible circuit
Soft and hard circuit board production process

Soft and hard circuit board production process

The flexible and hard circuit board is the flexible circuit board and the rigid circuit board. After pressing and other processes, they are combined according to the relevant process requirements to form a circuit board with FPC characteristics and PCB characteristics. In the past, two hard boards were connected by using soft boards and connectors to connect each other. In order to improve the reliability of the connection between the rigid board and the flexible board, the flexible board is directly fabricated between two rigid boards in the printed circuit board (PCB) factory, which can avoid the subsequent connection process, whether it is a rigid board manufacturer or FPC manufacturers are now able to supply rigid-flex boards. Under the demand for light and thin end products, the

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