The Outlines of how power battery match "four modernizations"

In China's auto new "four modernizations" (electric, intelligent, snatched, sharing) is put forward and the development of today, highly amalgamation characteristic must be the development trend of the future.The core of electric technology and parts,The batteryAnd integration technology how to better adapt to and match the "four modernizations" progress, not only need batteries technical breakthrough, more in need of integration technology highlights its features.As the saying goes "makes no garland, slanting solution is, in the process of new energy development over the years, has been fully proved this point, that is, the integration technology of batteries.

Power batteryIntegration is an urgent need to innovation

New four modernizations "battery as a power source, do not drag the hind legs."This warning is not alarmist.Electric into for new modernization first, not only is the core of electric technology, more importantly, there are too many problems are not solved."Prime minister visited Japan, saw what he looked dignified gap is so big," this is the recent media of high frequency words.Although said the fuel cell, but usLithium ion batteriesThe gap!There is no denying the fact that the battery integrated technology, there are still a big gap.Silent and cultivated battery technology from abroad in recent years, "batteries technology to see Japan and South Korea, integration technology to see Europe and the United States", this sentence is not unfounded.Technology, using materials, vehicle integration advantages and experience, used in power battery research and development and application.Of course, it is undeniable for the long-term development of the domestic level.Standard fast tracking and perfect, is a typical symbol.Our advantage is obvious, can use with market driving industrialization (market) in front of us;The use of centralized and unified policy, deployment of resources.But, how to make good use of advantages and opportunities, catching up fast, still need to intensify "innovation".

Integration of higher requirements on batteries

1. The security issues

Although musk always complain after tesla vehicles on fire: why don't the media focus on traditional fuel car accident.But I still think that the user is right, the customer is right to worry.Our technology innovation and progress, is to solve the problem of the user to worry about, let the accident ratio of small small again.This is our responsibility.From batteries, battery safety, on the one hand, internal nature breakthrough, on the other hand is the "integration" seek breakthrough technology.Application at present most monitoring technology, power technology, fusing technology, heat isolation technique, seems also to resist the tesla flame.Still need to work.

From May 25 black technology: "recently in southern Switzerland ticino state highway, a German driver tesla ModelS into the central isolation belt, then the vehicle rollover and quickly caught fire, and the driver was trapped in the car.Swiss fire department via Facebook announced that the cause may be the vehicleThe lithium batteryAfter the violent collision happened "thermal runaway.

2. The BMS management techniques

Most of the time, SOC estimation accuracy, not too much progress.Still unable to accurately capture the chemical energy work and the difference of the stationary state in the head and tail set aside absorption capacity of battery charging and discharging deviation allowance, let the battery cost wasted 5 ~ 10%.Foreign products, in this regard, do more meticulous, work from the leaf lower limit SOC16.35 % state accuracy of the calibration value as you can see, behind it is the cost of the bloody sense of urgency.New four modernizations, driven by BMS is not only estimate the exact problem, its management functions, diagnostic function, strategy, hardware architecture and software integration, modularity, requires innovation and breakthrough.

3. Lightweight battery system

The weight of the battery, have always been much-maligned, has a long history, are numb.Emotions are batteries.But work from nearly a period of time, communication or parameter in the table, when put forward the concept of energy density, quietly changed.Is no longer put the first cell energy density, but in front of the energy density, heavy added two word "system".Someone had done statistics, the electric car weight by 10%, the corresponding range can be increased by 5.5%.In leaf2018 product, also with traces of lightweight, "to reduce the weight of the battery case, reduce the number of screws used to fix the battery module, and remove the bracket redundant wall thickness, but also reduce the battery module outside."

4. The battery integrated standardization process

The standardization of battery, is the most effective way of authors.This problem, some manufacturers at home, early to see the problem, and has a standard module products.However, market benefit is not so good.Investigate the reason and standardization in the early stages of the development, is the survival of the need to rely on a certain platform.The status quo of domestic, even the most basic cell shape, with diversified forms.Although has the relative standards of domestic, execution effect is not ideal.Personally, in the standard dimension too much, too much diversified system requirements, give attention to two or morethings equals no standard.In contrast, VDA single square housing standard cell size, why can obtain many battery industry recognition is worth thinking about.The standardization of battery, can effectively promote integrated modular development of battery.

Modular "integration" technology innovation and development

1. The module "modular" new trend, transverse "generality" platform

Modular, the concept is not new, as early as 2012, the public's new application platform of powertrain MMBMQBMLB modular multiple brands, have been put forward and taste: reduce the development cycle and risk, greatly reduce the redundancy of models.Actually, itself to reduce the cost of increased reliability and security of the vehicle.

The battery module design, the public USES the thinking of the same: to build battery pack modular platform.That is to say, don't need every models to design module."The Volkswagen group is responsible for research and development of canossa (Heinz - JakobNeusser) members of the board of directors told the media: although different battery car specifications, but a unified cells can be used in a different way of packaging quantity and, to meet various needs.Group's goal is to simplify the battery unit designed to reduce costs by 66%."This is already a few years ago, we are not to wonder whether the target has reached, however, modular thinking is correct.

New modularization, in addition to realize the modular structure Angle, to authors and increase the reliability for the purpose, and, more importantly, needs to implement modularity in terms of function control.Emphasizing the independence of the function and integrity.For example, to realize the collection module of the terminal, charge and discharge management, security management, hot functions in one body.Narrow point of view, and battery electronic components in addition to the collection, equilibrium function, also need to have the function of the battery management module BCU.Use of Internet communication, more effective regulation battery safety.

Modular not only realizing the unity of the height of the structure, function, at the same time, when the module into "energy" concept, completely can choice according to the requirements of the vehicle battery size.If the new four modernizations vehicles, equipped with is flexible, safe, portable power, power will no longer be the bottleneck problem of concern.

2, batteries, connection technology revolution, through longitudinal "sequence using and recycling value chain"

Batteries group connection, from the initial bolted to the present welding technology, the advantages, the stability, consistency, life got a lot of ascension, structure also small volume, at a much lower internal resistance, make batteries power can get the biggest release.Its shortcomings, is unique in the lithium ion battery of the draftees utilization and recycling application link, caused the trouble, increase the cost.Welding process in the production front end, need special equipment, tooling and complete;The backend maintenance, arrangement in use, terminal and dismantling, is also very for the inconvenience.Currently in sequence using the link, the general disassembly to module is over.Sequence to use is not complete.So, while welding is existing batteries connected, the main technology of group, however, from the value chain analysis, the welding process is a one-way process, hindered the reuse of lithium ion batteries.

In recent years, some factories in trying new connection technology.This kind of innovation, it is worth for sure.The batteries and optional combination, is not only greatly authors problem, more important is to improve the module of modularization and standardization.Is also in line with the new thinking of the development of the four modernizations.

3, module voltage standardized platform, open up more purposes

The new development trend of modernization, from the perspective of Shared in the broad sense, also apply to the needs of the parts.We imagine that if the power battery module, also applies to future vehicle platform for 48 v low voltage;Also can put the passenger car retired 72 v module used in low-speed electric cars and so on, because of the independence of the modularization and standardization, application scope will increase greatly.At the same time, also facilitate product performance in safety and subsoil.Shared power battery modular units, open up more and more application fields.

summary

Power battery as a power source, the technological progress cognition, from the initial "batteries is all", rise to PACK the system integration design concept.However, with the implement of back fill, in the face of the inherent cost pressure, safety and reliability, power battery innovation and development is imminent.At the same time, new car, modernization need better batteries to match demand.Innovation on the road to the battery, many ways, also need to learn from the traditional approach to the development of the car;Also need to develop a new innovative thinking.

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