Power lithium battery monomer supply steering module supply

Power lithium battery monomer supply steering module supply

In the context of the government to enforce fuel consumption and new energy vehicle points parallel management, a large number of car companies have launched a new energy vehicle development listing plan, and to continue. In order to meet this series of plans, in the field of PHEV (including EREV), EV, automotive companies should use different new energy vehicles to meet the policy norms, meet market demand and cater to consumers, this is to model models The core indicator (battery life, hundred kilometer acceleration and charging speed) performs some dynamic configuration and management, and can deal with future possible battery providers conversion. In this process, we met to talk about the value of the battery management system, and how to do battery management system.

The first part of the module supply is simple. With the development of the electric motor industry, my country may also be the same as German VDA, launching a car lithium-ion battery standard, battery monomer and module standardization. By mixing the battery cells, in parallel, the battery module is unified, and the mechanical properties, thermal characteristics, and safety characteristics of the battery body are considering the mechanical properties of the battery body.

. In the case where the design is constant, supply different battery capacity according to different battery life and power requirements to meet different needs..

This modular application can achieve large-scale automation production in the monomer and module end, which greatly reduces production costs, which makes the entire battery company to minimize units.. The modular supply has changed the original battery company’s construction.

It turns out that the battery monomer is supplied. The basic unit turns into a module small assembly..

In this process, the next integrated battery module is compared to the traditional electric vehicle module to house a larger capacity battery pack.. In the past, the battery module generally consists of 12 capacities of 2-3kWh battery pack, and now starts to accommodate a 6-8kWh battery group that can accommodate 24 monomers.

. This will increase the battery capacity in the same battery space, effectively add electric vehicle life..

Research Weekly | Power Lithium Battery Monomer Supply Steering Module Supply, Analysis of the Value of Battery Management System and Implementation of Figure 1PHEV and EV Modules Software The basic situation is similar, and it is also beginning to develop this direction. Research Weekly | Power Lithium Battery Monomer Supply Steering Module Supply, Analysis of the Value of Battery Management System and Implementation Figure 2 Module of Soft Caps As shown in Figure 3, the module is embedded with LECU function, basic molding Group temperature acquisition and monomer voltage collection and voltage protection are done. Monomer voltage measurement and voltage monitoring: the collection and protection of the voltage of the monomer, this function is decentralized.

Here is: Collecting a monomer voltage: Accuracy affects the comparison of overalls and undervoltage of monomer differentiation: the logical function checks that can be completed under the bottom: The discrimination of monomer accumulation and module voltage is realized. Diagnostic processing battery temperature for the entire function: It is usually placed in a module to collect buswork welding temperature, and the battery temperature difference communication and signal in the module: transfer the temperature, voltage information, and Basic monomer overvoltage undervoltage transmits the actual control of the equalization equalization: Important includes actual circuit diagram 3lecu and its basic function second part battery management function as mentioned earlier, due to the change of supply mode, the battery management function must match the entire Battery system, underlying basic components become a module. The problem of automotive companies is: the difference in demand of the vehicle power system: according to the demand of the actual configuration of different vehicles, the discharge capability and power characteristics of the battery have different requirements charging characteristics: according to the actual situation of use, can be Special to make a custom area usage characteristic: depending on the vehicle’s use area environment, even the difference in configuring the module for different thermal management characteristics may be different depending on the needs of the whole vehicle, to switch the chemical system of the monomer.

Research Weekly | Power Lithium Battery Unit Supply Steering Module Supply, Analysis of the Value of Battery Management System and Implementation Figure 4 High Pressure System Architecture This Single supply steering module supply, analytical battery management system value and implementation Figure 5 Battery management system kernel This area is divided into “variable portion” and “non-variable part”, with a common part of which: 1) battery parameter detection: Including total voltages, total current, insulation detection (monitoring leakage), collision detection, etc.. Total voltage measurement: When subsequent calculation of SOC, it is often calculated using the total voltage of the battery pack.

This is one of the important parameters of the battery pack parameters; if the meter voltage is measured by the monomer voltage, the battery monomer voltage is sampling. Time difference, there is no way to achieve accurate alignment with the data of the battery sensor, so the battery pack voltage is often used as the main parameter..

When diagnosing the relay, it is more compared to the internal and external voltage of the battery pack.. Total current measurement: Current measurement means important division two intelligent splitter or Hall current sensor.

Since the current value to be processed by the battery system is often large, such as the charging current of the vehicle accelerates the discharge current and energy recovery, the output current (discharge) and input current (charging) of the measurement battery pack are evaluated. And precision. Insulation resistance detection: Insulation detection of the entire battery system and the high pressure system, it is relatively simple to relieverate the insulation resistance of the bus positive and negative electrode to the ground wire.

. You can also use active signal injection, it is important to detect the insulation resistance of the battery..

High-voltage interlock detection (HVIL): Used to confirm the integrity of the entire high voltage system (can be divided into two parts of the discharge loop and charging circuit), when the high-voltage system loop is disconnected or the integrity is damaged, security measures should be launched. In. SOC and SOH estimates: including Paler (SOC) or Discharge Deefficient (DOD), Health State (SOH), Function Status (SOF), Energy Status (SOE), Fault and Security (SOS), etc.

2) Troubleshooting and Fault-tolerant operation fault detection refers to the diagnostic algorithm to diagnose a fault type by analyzing the collected sensor signals, and performs an early warning.. Battery fault refers to a sensor failure of individual subsystems such as battery pack, high voltage circuit, and thermal management, an actuator failure (such as contactor, fan, pump, heater, etc.

), and network failure, various controller hardware and software failures Wait. The battery pack itself fails to refer to overpressure (overturbation), undervoltage (over) overcurrent, ultra high temperature, short-circuit fault, linker loose, electrolyte leak, insulation, etc..

The failure of the battery management unit also conducts alarm in a fault code (DTC), through the indicator of the DTC trigger dashboard, there is also a corresponding indicator light in the new energy vehicle in the new energy vehicle to remind the driver.. Since there is a certain risk of the battery, it is often necessary to transfer information directly to the vehicle system to deal with sudden accidents.

. For example, when an accident occurs, when the airbag pops up, the relay is directly cut by the vehicle controller, and the vehicle system is handled by positioning and warning, especially battery discharge..

Troubleshooting includes diagnosing battery cells, battery pack voltages, current, battery pack temperature measuring circuitry, determines fault location and fault level, and makes corresponding fault tolerance control. Fail-Safe’s fault-tolerant operation mechanism refers to the downgrade operation processing of the vehicle after the vehicle encounters an error during the operation..

In fact, this function is more like all over the above features and backups.. This mechanism includes fault detection, fault type judgment, fault location, fault information output, etc.

. 3) Relay Control Control The battery pack generally has a multi-relay system, completes the driving supply and state detection of the relay, and relay control is often confirmed after the controller is coordinated, and the collision signal output by the airbag controller is generally Relay controller is open directly. Battery packs Relay generally have primary, main negative, precharge relays and charging relays, and independent distribution boxes outside the battery pack are more detailed for the entire current distribution.

. The relay control, closing, disconnected state of the battery pack is important..

Variable part: 1) Hot management: to detect temperature parameters of battery pack heat management system (temperature inlet and exit temperature), detection circuit and monomer detection. According to the temperature distribution information and charge and discharge requirements in the battery pack, the strength of the active heating / heat dissipation is determined, so that the battery is as best as possible to give full play to the performance of the battery..

Heat control: The chemical performance of the battery is very affected by the temperature of the environment. To ensure that the battery life must make the battery within a reasonable temperature range, and to give the vehicle controller according to different temperatures to the vehicle controller. Input maximum power.

About the temperature control of the battery system is important to use the CFD simulation analysis. The core is the external way of selecting different thermal management, and then guarantees the temperature threshold by the internal management policy..

Research Weekly | Dynamic Lithium Battery Monomer Supply Steering Module Supply, Analysis of the Value of Battery Management System and Implementation of Figure 6 Boundary BACT 2) A set of BMU systems 2) Charge control The original battery management system It is a demand for monitoring battery systems during charging process, which is responsible for current input of the entire battery system, contains controlled control of conventional charging and energy recovery.. Now the variable part is a fast-charged design, because the consumer’s needs and the actual situation, this place is also a highly high change area.

. 3) Equilibrium management: The series battery pack is in the actual use process, and the output capacity of each series is different..

The battery does not only have the limitations of over-discharge and overcharge, but also in different temperatures and different SOCs, the power of input and output also limit. That is to say, the limitations of a single battery will affect the entire battery. Individual differences between individual cells in the battery pack: differences in monomer capacity, variation in monomers, differences in monomers, current differences in current differences, and time of time.

With time changes in the battery pack, the unit capacity of the battery, the internal resistance, and the monomer self-discharge occurs.. Customer use: charging time, discharge time external environment: self-discharge at the same temperature, self-discharge system under different SOC interaction: BMS work condition, this factor and BMS work status is related.

When the actual battery capacity changes, the upper end of the BMU is to give different strategies in the case where the balance capability is killed.. Therefore, the future possible change is that the battery management system forms the separation of the lower end and the upper end.

In order to pay a large number of projects, save management and change management, the automotive plant must form Party B, specialize in system software, to be responsible The core algorithm and configuration process of the entire battery system management, they are responsible for setting up the protection and use of the battery, responsible for the availability and after-sales of the entire vehicle. The hardware of the entire BMS management is that it is not related to the car enterprise. Here is a very good hardware and software interface file, otherwise it is very easy to go wrong.

. The things we have in the future are quite limited.

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