CN204068383U - A kind of battery management system of mobile energy-accumulating power station - Google Patents

Abstract

The utility model relates to a kind of battery management system of mobile energy-accumulating power station, and system comprises: data acquisition module: the operational factor of acquisition system, and parameter is uploaded to main control module; Battery balanced administration module: main control module, according to the system operational parameters of data collecting module collected, manages the energy of single battery, makes each single battery balancing energy; Temperature equalization administration module: temperature during acquisition system work, makes temperature in a dynamic range by cooling measure; Main control module: analyzing and processing is carried out to the parameter of data acquisition module, and according to the operating state of these state modulator and battery balanced administration module and temperature equalization administration module; Power module: for modules provides stable working voltage.The utility model is by detecting the external characteristic parameter (as voltage, electric current, temperature etc.) of battery, adopt suitable algorithm, realize estimation and the monitoring of inside battery state (as capacity and SOC etc.), this is the basis effectively run of battery management system and key.

Description

A kind of battery management system of mobile energy-accumulating power station

Technical field

The utility model belongs to mobile technical field of energy storage, is specifically related to a kind of battery management system of mobile energy-accumulating power station.

Background technology

Energy storage technology is mainly used in the fluctuation of stabilizing solar energy power generating/wind power generation, improves the ability to arrange jobs of electrical network to new forms of energy, has part concurrently to electric-net valley-electricity energy storage peak value power supply function simultaneously.Consider to take into account distributed energy storage and the grid-connected application of scale, energy-storage system should adopt modular assembly to build mode, mainly comprises battery module, battery management system, bidirectional energy-storage current transformer, monitor protective system four layers of framework from bottom to top.Wherein, battery management system is the charge-discharge control unit of whole movable energy storage system, takes into account the collection to system operational parameters simultaneously, the safe operation of control system, is the indispensable part of mobile energy-accumulating power station.The balancing technique of battery management system can change the electric current of discharge and recharge between different battery or charge and discharge adds up electricity, is the key technology solving battery consistency difference in groups.The current balance of continuous and effective and correct Balance route strategy, can prevent battery from occurring consistency difference, useful life in groups index has conclusive effect at battery.

Utility model content

The utility model provides a kind of battery management system of mobile energy-accumulating power station, the state of Real-Time Monitoring battery, the operational factor of acquisition system, correct obtain the running status of battery after carry out battery heat management, battery balanced management, management of charging and discharging and fault alarm etc.

The technical solution of the utility model is: a kind of battery management system of mobile energy-accumulating power station, and described management system comprises: data acquisition module: the operational factor of acquisition system, and parameter is uploaded to main control module; Battery balanced administration module: main control module, according to the system operational parameters of data collecting module collected, manages the energy of single battery, makes each single battery balancing energy; Temperature equalization administration module: temperature during acquisition system work, makes temperature in a dynamic range by cooling measure; Main control module: analyzing and processing is carried out to the parameter of data acquisition module, and according to the operating state of these state modulator and battery balanced administration module and temperature equalization administration module; Power module: for modules provides stable working voltage.Described data acquisition module comprises voltage detection unit, current detecting unit and insulating properties detecting unit, and the data of collection are sent to main control module by voltage detection unit, current detecting unit and insulating properties detecting unit.Described current detecting unit adopts Hall current sensor.Also be connected with light-coupled isolation module between described data acquisition module and main control module, number, the digital signal of data collecting module collected input main control module after light-coupled isolation module.Described battery management system also comprises insulating power supply module, and power module obtains the power supply of voltage detecting, current detecting, insulating properties detecting unit through insulating power supply module.Described power module input front end adds diode and completes reverse protection, strengthens the anti-interference of system.Described battery management system also comprises display module, and display module connects main control module.Described battery management system also comprises alarm module, and alarm module connects main control module.

The utility model has following good effect: 1) Real-Time Monitoring battery status.By detecting the external characteristic parameter (as voltage, electric current, temperature etc.) of battery, adopt suitable algorithm, realize estimation and the monitoring of inside battery state (as capacity and SOC etc.), this is the basis effectively run of battery management system and key; (2) after the state of correct acquisition battery, heat management, battery balanced management, management of charging and discharging, fault alarm etc. are carried out.

Accompanying drawing explanation

Fig. 1 is the system construction drawing of the utility model embodiment.

Embodiment

Contrast accompanying drawing below, by the description to embodiment, embodiment of the present utility model is as the effect of the mutual alignment between the shape of involved each component, structure, each several part and annexation, each several part and operation principle, manufacturing process and operation using method etc., be described in further detail, to help, those skilled in the art conceive utility model of the present utility model, technical scheme has more complete, accurate and deep understanding.

Battery management system refers to can the parameter information of Real-Time Monitoring electrokinetic cell, state-of-charge (the State of Charge of estimating battery, SOC), effectively battery capacity managed and distribute, possessing the system of the complete set of the functions such as perfect fault detect, warning, data processing and transmission.

Battery management system of the present utility model comprises main control module, data acquisition module, display module, battery balanced administration module, temperature equalization administration module, power module and relay control module, main control module is the nucleus module of whole battery management system, the data acquisition of system operational parameters is carried out for control data acquisition module, and to the data analysis process returned, according to the result of data processing, control the operating state of battery balanced administration module and temperature equalization administration module, make the electric quantity balancing of single battery and the temperature of whole system, avoid temperature too high, damage instrument, reduce useful life.Main control module by relay control module come control relay adhesive, disconnect and control battery pack and whether outwards power, power module provides stabilized power supply to various electricity consumption device.

Data acquisition module comprises voltage detection unit, current detecting unit and insulating properties detecting unit, and the voltage of lithium ion battery best embodies the situation of battery.It is the foundation of lithium ion battery super-charge super-discharge, can also by the SOC of measuring junction voltage lithium ion battery according to a preliminary estimate.In car load actual condition, along with the carrying out of battery set charge/discharge, the voltage of battery pack constantly changes, and between cell, the consistency of voltage also can affect the performance of battery pack greatly, so be also necessary the voltage detecting each cell.After adopting special voltage acquisition chip to carry out analog-to-digital conversion to monomer battery voltage, by optocoupler, digital signal is reached main control module, the accuracy of detection of monomer battery voltage is 10mV.

The operating current of battery pack and temperature are also the important parameters of battery pack one, and whether it occurred putting and overcurrent can to lead to over-current judging, can also by the SOC of ampere-hour method estimating battery.Battery pack is in the actual condition of car load, and the excursion of electric current is between-200A to+500A (precision: 1A), in order to ensure the precision of current acquisition, adopts the shunt that gamut equally accurate is higher to detect battery pack total current.Signal is sent into high-speed AD and is carried out digital-to-analogue conversion and current integration computing after conditioning, and digital signal inputs main control module and processes after light-coupled isolation, and the detection of electric current generally adopts Hall current sensor.

Whether insulating properties detecting unit is used for test judgement power battery pack and car body and insulate up to standard, by measuring the voltage between DC bus and electric chassis, calculates the insulating resistance value of system.

Temperature equalization administration module is an important component part of battery system management.The amount of heat that battery produces at work, by spatial limitation and accumulating, causes non-uniform temperature everywhere thus affects the consistency of battery cell.Therefore will reduce battery charging and discharging cycle efficieny, the power and the energy that affect battery play, and also will cause thermal runaway, influential system safety and reliability time serious.In order to make battery pack play best performance and life-span, needing the structure optimizing power brick, heat management is carried out to battery pack.

The temperature detecting battery pack on the one hand in order to prevent the too high and excessive temperature differentials of battery pack temperature, prevents security incident; On the other hand, judge the operating state of battery according to the temperature of battery pack, provide foundation for SOC revises.Detected temperatures is generally add multiple temperature sensor in battery pack, detects the temperature of each point in battery pack.Because the electric current of dynamical lithium-ion battery packs is often larger.After system temperature is uploaded to main control module by temperature equalization administration module, main control module judges whether to take cooling measure according to Current Temperatures, reduces performance to avoid uneven between battery; Eliminate the potential hazard relevant with runaway temperature; Directly or indirectly contact initiatively or passive heating/cool batteries bag by using air, liquid and battery; Ventilation is provided, ensures that the potential pernicious gas that battery produces can be discharged in time, thus ensure that battery can safe operation.

The power module that battery management system of the present utility model uses is that vehicle-mounted 24V is transformed into 5V, adopts insulating power supply module to obtain voltage detecting, current detecting, insulating properties detection, temperature detection power supply.Add diode at power supply input front end and complete reverse protection, two stage filter circuit is conducive to the anti-interference of system.

The accurate estimation of battery charge state (State of Charge, SOC) is the important evidence of electrokinetic cell charge and discharge control and energy source optimization management, directly affects the useful life of battery.Visible, the Measurement accuracy of battery dump energy is very crucial problem.But battery SOC can not directly be measured, its size can only be estimated by parameters such as battery terminal voltage, charging and discharging currents and internal resistances.And these parameters also can be subject to the impact of the multiple uncertain factors such as cell degradation, variation of ambient temperature and motoring condition, therefore SOC estimates to have become problem demanding prompt solution in electric battery management system accurately.

Choosing battery charging and discharging electric current is system input variable, and battery SOC is state variable, and cell voltage is system output variable.In discrete system, sample to battery behavior parameter at each sampled point, as system input variable, the input variable that algorithm records in conjunction with current time and the state estimation in a upper moment, complete the renewal to state variable and output variable.The utility model adopts expanded Kalman filtration algorithm, and calculate the SOC of battery, its iterative step is as follows:

Step (1): first determine parameter A _k-1, C _k.

$A_{k-1}=\frac{\∂f(x_{k-1},u_{k-1})}{{\∂x}_{k-1}}=1---\left(1\right)$

$C_k=\frac{{\∂y}_k}{{\∂x}_k}=\frac{K_1}{x_k^2}-K_2+\frac{K_3}{x_k}-\frac{K_4}{1-x_k}---\left(2\right)$

Step (2): obtain an initial SOC value SOC ₀all square evaluated error initial value P ₀ ⁺.

$x_0^{+}={\mathrm{SOC}}_0,P_0^{+}=\mathrm{var}\left(x_0\right)---\left(3\right)$

Step (3): obtain prediction SOC value x _k ^-with predicted voltage value y _k ^-.

$x_k^{-}=x_{k-1}^{+}-\left(\frac{{\mathrm{\η}}_i\mathrm{\Δt}}{{\mathrm{\η}}_T{Q}_n}\right)i_k---\left(4\right)$

$y_k^{-}=K_0-{\mathrm{Ri}}_k-\frac{K_1}{x_k^{-}}-K_2{x}_k^{-}+K_3\ln \left(x_k^{-}\right)+K_4\ln (1-x_k^{-})---\left(5\right)$

Step (4): obtain all square evaluated error P of prediction _k ^-, calculate kalman gain L _k.

$P_k^{-}=A_{k-1}{P}_{k-1}^{+}{A}_{k-1}^T+D_w,L_k=\frac{P_k^{-}{C}_k^T}{C_k{P}_k^{-}{C}_k^T+D_w}---\left(6\right)$

Step (5): the optimal estimation x calculating SOC _k ⁺, all square evaluated error P _k ⁺optimal estimation.

$x_k^{+}=x_k^{-}+L_k(y_k^{+}-y_k^{-}),P_k^{+}=(1-L_k{C}_k)P_k^{-}---\left(7\right)$

By reference to the accompanying drawings the utility model is exemplarily described above; obvious the utility model specific implementation is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present utility model is conceived and technical scheme is carried out; or design of the present utility model and technical scheme directly applied to other occasion, all within protection range of the present utility model without to improve.

Claims (8)

1. a battery management system for mobile energy-accumulating power station, is characterized in that: described management system comprises:

Data acquisition module: the operational factor of acquisition system, and parameter is uploaded to main control module;

Battery balanced administration module: main control module, according to the system operational parameters of data collecting module collected, manages the energy of single battery, makes each single battery balancing energy;

Temperature equalization administration module: temperature during acquisition system work, makes temperature in a dynamic range by cooling measure;

Main control module: analyzing and processing is carried out to the parameter of data acquisition module, and according to the operating state of these state modulator and battery balanced administration module and temperature equalization administration module;

Power module: for modules provides stable working voltage.

2. the battery management system of mobile energy-accumulating power station according to claim 1, it is characterized in that: described data acquisition module comprises voltage detection unit, current detecting unit and insulating properties detecting unit, the data of collection are sent to main control module by voltage detection unit, current detecting unit and insulating properties detecting unit.

3. the battery management system of mobile energy-accumulating power station according to claim 2, is characterized in that: described current detecting unit adopts Hall current sensor.

4. the battery management system of mobile energy-accumulating power station according to claim 1, it is characterized in that: be also connected with light-coupled isolation module between described data acquisition module and main control module, number, the digital signal of data collecting module collected input main control module after light-coupled isolation module.

5. the battery management system of mobile energy-accumulating power station according to claim 1, it is characterized in that: described battery management system also comprises insulating power supply module, power module obtains the power supply of voltage detecting, current detecting, insulating properties detecting unit through insulating power supply module.

6. the battery management system of mobile energy-accumulating power station according to claim 5, is characterized in that: described power module input front end adds diode and completes reverse protection, strengthens the anti-interference of system.

7. the battery management system of mobile energy-accumulating power station according to claim 1, is characterized in that: described battery management system also comprises display module, and display module connects main control module.

8. the battery management system of mobile energy-accumulating power station according to claim 1, is characterized in that: described battery management system also comprises alarm module, and alarm module connects main control module.