CN201904627U - Balanced charging and discharging management device for lithium ion battery pack - Google Patents
Balanced charging and discharging management device for lithium ion battery pack Download PDFInfo
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- CN201904627U CN201904627U CN2010205979237U CN201020597923U CN201904627U CN 201904627 U CN201904627 U CN 201904627U CN 2010205979237 U CN2010205979237 U CN 2010205979237U CN 201020597923 U CN201020597923 U CN 201020597923U CN 201904627 U CN201904627 U CN 201904627U
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Abstract
The utility model discloses a balanced charging and discharging management device for a lithium ion battery pack. The balanced charging and discharging management device is provided with a plurality of extension management modules (1). An insulating type controller area network (CAN) bus signal is connected between a master control module (2) and each extension management module (1). A power line is also connected between the master control module (2) and each extension management module (1). A power line is connected between each battery unit (3) to be charged and discharged and each corresponding extension management module (1). A battery pack formed by connecting the battery units (3) in series is connected with the master control module (2). Two-way synchronous energy of the charging and discharging of each battery unit in the lithium ion battery pack can be directly transferred and balanced, so as to realize the balanced current the same as the charging current, and realize the energy balanced transfer changing in the process of the balanced charging and discharging of the large current in the charging process of each battery unit in the battery pack, improve the service efficiency, and prolong the service life of the battery pack.
Description
Technical field:
The utility model relates to that the charge and discharge of lithium ion power that the series connection of a kind of multiple unit uses and energy-storage battery group are distributed, the dynamic battery management device of digitlization and system integration.
Background technology:
Along with to country to new forms of energy and new-energy automobile, particularly electric automobile is encouraged the appearance in succession of support policy, the application of chargeable lithium ion energy storage and power battery pack more and more widely, as a kind of novel chemical power source, lithium ion battery has that light weight, volume are little, memory-less effect, have extended cycle life, safe, pollution-free, advantage such as adaptive temperature is wide, be the NI-G that substitutes present mainstream applications, the optimal electrokinetic cell and the energy-storage battery of Ni-MH battery.
But, because present homemade lithium ion battery material performance and batch unstable properties, battery production technology is from mixing oar, film, roll-in, the section film-making, assembling, welding, fluid injection, change into and the humidity of partial volume in the finished product process, temperature, viscosity, machining accuracy is perfect not to the utmost with control technology, even through strict trace routine, the voltage of each battery unit, resistance, capacity is basically identical also, but forming several strings, tens strings even the battery pack more than the string up to a hundred are after a period of time recycles, because its particular electrical chemical characteristic, the internal resistance of battery, voltage, parameters such as capacity also can produce fluctuation, form inconsistent state, cause the difference between the battery unit.This species diversity body surface now be full of for battery pack or the series-connected cell core when having put between voltage and capacity inequality.This situation has directly caused the battery of battery pack overtension in the process of charging to trigger the battery pack overcharge protection ahead of time; And the battery of brownout can cause the battery pack in discharge process, thereby the whole volume of battery pack is obviously descended.The actual capacity of the capacity that whole battery group embodies for the poorest battery of performance in the battery pack, thus further aggravation overcharges and crosses the appearance of putting phenomenon, buries potential safety hazard, reduces the whole cycle life of battery pack, causes it to lose efficacy in advance.Therefore, the circuit of the difference requirements operation between the unit of lithium ion battery group can be finished the equalization operation to battery unit, accurately manages the charging and the discharge of lithium ion battery group.
The balance charge/discharge technology mainly is in order to solve the bias phenomenon of the electrochemical properties of each unit in long-term charge and discharge cycles process in the lithium ion battery group.Lithium ion battery substitutes cadmium nickel, Ni-H cell can not be applied mechanically traditional simple " plug and play " mode.This is that promptly lithium ion battery must be forbidden to overcharge and overdischarge because lithium ion battery and cadmium nickel, Ni-H cell have the difference of a maximum.Therefore, must be in conjunction with lithium ion battery characteristics design new management of charging and discharging circuit structure and control and management technology.
In through engineering approaches was used, the battery unit that the battery cell of lithium ion battery composes in parallel must be connected into battery pack, so the balance phenomenon of each battery unit or battery unit module in must the consideration charging process.As time goes on, this balance phenomenon can be serious further, influences battery life and reliability.Therefore, equalizing charge and discharge are the key core technology that lithium ion discharges and recharges, i.e. overall process, dynamic and intelligent balanced management technology in the charge and discharge process.
So-called lithium ion battery group equalizing charge and discharge are exactly that the voltage deviation between lithium ionic cell unit is remained in the default scope, thereby guarantee that each battery unit carries out equalizing charge and discharge control in the process of recycling; And, alleviate or reduce the voltage differentiation between each battery unit along with the increase of charge and discharge cycles.
Equalization methods commonly used at present has the balanced and resistance equilibrium of energy storage.The energy storage equilibrium is to utilize the discharge and recharge function of battery to energy-storage travelling wave tubes such as inductance or electric capacity, realizes the switching of energy-storage travelling wave tube between unbalanced battery unit by relay or switching device, and the energy that reaches between battery shifts.The general more complicated of this balanced charging method Control Network is had relatively high expectations to security management, notes also in use and grasps discharging and recharging the time of energy-storage travelling wave tube.Its biggest advantage is during charge and discharge (work) are used, but functions of each element cell of balance all, and do not consume the electric energy of lithium ion battery group; The resistance equilibrium generally is by the break-make of controller controlling resistance network battery pack to be shunted equilibrium, balanced principle is in the process of batteries charging, when certain batteries charging rate very fast, voltage is higher than other batteries, system reduces the charging rate of battery, to reach the purpose of each batteries equalizing charge by the conducting shunting of control switch control equalizing resistance, this method can be carried out equilibrium to multiple batteries simultaneously, and control is simple.If but resistance choosing excessive in the balancing procedure, then euqalizing current is too little, has little effect; If the resistance choosing is too small, then resistor power is very big, and the system capacity loss is big, and balanced efficient is low, and system's opposite heat tube reason is had relatively high expectations, and need carry out temperature detection control.
The battery management system major function of having gone on the market at present, is to detect data targets such as the total voltage of the voltage of battery unit, battery pack, total current.But; the basic principle of its design is as a unique unit according to multiple unit series connected battery group; occur overcharging in the unit or when condition to one's heart's content, report to the police and (or reduction) electric current until cutting off total anodal and total negative pole, to realize to the simple logical circuit protection of battery pack.
Because this series products does not possess the charge and discharge balancing management to distributed unit, whole charging and discharge are close to " naked filling or naked putting ", can't make the high efficiency charge or discharge of normal battery unit, lasting circulation is gone down and can directly be reduced the overall operation ability and the cycle life of battery, so, from the technological layer definition, belong to elementary battery pack checkout gear.
The maximum characteristics of another kind of product are the control template that is provided with the battery module that some battery units form, and when setting index, stop the charging of this module in the voltage that detects this module or predefined control index, avoid overcharging.This pattern belongs to terminal charge balancing, does not possess the equalization discharge function, and the control template volume under this pattern is big, weight is big, also needs to carry out information exchange with charging system independently and communicates by letter, can't integrated two systems.Being because of the similar bypass circuit technical approach of this control module in addition of this pattern with drawback, it is low excessively to avoid the charge balancing electric current that the battery assembly module series connection causes, and actual effect is not good, can't really play the function of charge balancing.
Summary of the invention:
Goal of the invention of the present utility model is to disclose a kind of charging of each battery unit in the lithium ion battery group and discharge bi-directional synchronization energy realized directly to shift equilibrium, realized that euqalizing current is the same with charging current, and reached that each battery unit shifts charging in the big current balance charging of charging process and the balancing energy in the discharge process in the battery pack, made the service efficiency and the life-span raising of battery pack.
Realize that technical solution of the present utility model is: described device has a plurality of extension set administration modules 1, between main control module 2 and each the extension set administration module 1 isolated CAN bus is arranged, this CAN bus is the category of fieldbus, it is the serial communication network of distributed control of a kind of effective support or real-time control, its bus specification has been formulated by ISO International Standards Organization and has been international standard, and be acknowledged as one of the most promising fieldbus, or the serial bus signal of other same types connects, also have the power line to be connected between main control module 2 and each extension set administration module 1, have the power line to connect between each battery unit to be discharged and recharged 3 extension set administration module 1 corresponding with, the battery pack that each battery unit 3 series connection constitutes is connected with main control module 2.
Described main control module 2 is that a detection module 4 is connected with the full-bridge circuit that Q1～4 (high-power igbt module) constitutes, one Mcu one chip microcomputer control unit 5 is connected with full-bridge circuit, Mcu control unit 5 also is connected with communication bus with detection module 4, and full-bridge circuit is connected with extension set administration module 1.
Connect PWM (pulse width modulation) processor controls 8 of Mcu control unit 5 after described extension set administration module 1 has a switch transformer 6 and rectification circuit 7 is connected again, PWM processor controls 8 connects each battery unit 3 of battery pack.
Above-mentioned the utility model utilizes the components and parts of prior art integrated and draw described lithium ion battery group balance charge/discharge management devices, it is to manage by the discharging current of main control module to whole series battery, the data of coming through isolated CAN bus transfer are unified arrangement to be calculated, and each extension set administration module sent command signal, the extension set administration module is to the corresponding charging of the battery unit of each connection, stop, the adjustment charging current manages, unbalanced each battery unit can be charged accordingly by technical indicator separately, in the discharge process battery unit near discharge cut-off voltage is charged, to realize the equalization discharge function of discharge process.The utility model structure is simple relatively, makes full use of the components and parts of prior art and has realized effectively having improved the balanced effectively management of charging and discharging of lithium ion battery group the life-span of battery pack and the high-quality power supply performance can be provided.
Description of drawings:
Fig. 1 is the schematic block circuit diagram of management devices of the distributed lithium ion battery group of an embodiment of the present utility model.
Fig. 2 is the circuit topology schematic diagram of the master control administration module among the embodiment.
Fig. 3 is the circuit topology schematic diagram of the extension set administration module among the embodiment.
Embodiment:
See also Fig. 1～Fig. 3, specific embodiment of the utility model is as follows: a plurality of extension set administration modules 1 are arranged, the battery pack parallel connection that a plurality of extension set administration modules 1 and corresponding a plurality of battery units 3 constitute, there is isolated CAN bus signals to be connected between main control module 2 and each extension set administration module 1, each module all has address separately, also have the power line to be connected between main control module 2 and each extension set administration module 1, the battery pack of each battery unit 3 series connection formation is connected with main control module 2; During concrete the use, detection module 4 in the main control module 2 connects battery pack and is connected with electrical network and with the full-bridge circuit of Q1～4 formations, the power supply of the 4 pairs of systems of detection module is switched and the parameters such as electric current, voltage, capacity and temperature of each module, battery unit is detected, through the primary Calculation arrangement, send to main control module 2 through isolated CAN bus, there is a Mcu control unit 5 to be connected with full-bridge circuit, Mcu control unit 5 also is connected with communication bus with detection module 4, and full-bridge circuit is connected with extension set administration module 1; The PWM processor controls 8 of above-mentioned main control module 2 by Mcu control unit 5 is converted to high-frequency and high-voltage power supply with the pulse direct current high voltage source and offers each extension set administration module 1 so that each extension set administration module 1 self work, charging, the required energy voltage of balance to be provided, connect the PWM processor controls 8 of Mcu control unit after described extension set administration module 1 has a switch transformer 6 and rectification circuit 7 is connected again, PWM processor controls 8 connects each battery unit 3 of battery pack; To detect and after result calculated sends to main control module 2 at detection module 4, the hf and hv pulse electric current isolation that main control module 2 is provided is converted to the low-tension current that each battery unit 3 can be accepted again, after PWM processor controls 8 processing by the Mcu control unit, carry out equalizing charge with certain electric current for each battery unit 3, then can realize each battery unit 3 is carried out the specific targetedly charging of tool, in charging process, with the charging cut-ff voltage is standard, part of module is according to certain current charges, part of module stops charging after reaching the charging cut-ff voltage first automatically, stop charging module and descend naturally and be lower than after charging voltage and can start charging procedure automatically detecting battery unit 3 voltages, till repetitive cycling to battery unit is full of; In discharge process, as when detecting 3 unbalanced phenomenas of battery unit or some battery unit, start 2 pairs of these unbalance part battery units 3 chargings of master control module automatically, to realize the equalization discharge in the discharge process near final discharging voltage.
Of the present utility model simple in structure, each components and parts or the integration module that make full use of prior art obtain the utility model through the integrated design of uniqueness, realized each battery unit of series battery is detected in real time, and in charge and discharge process, concrete technical indicator according to each battery unit, carry out the adjustment of charging current targetedly, realize independent management, be in optimum state in working order down all the time to guarantee each battery unit to each unit.
Claims (3)
1. lithium ion battery group balance charge/discharge management devices, it is characterized in that having a plurality of extension set administration modules (1), there is isolated CAN bus signals to be connected between main control module (2) and each extension set administration module (1), also have the power line to be connected between main control module (2) and each extension set administration module (1), have the power line to connect between each battery unit to be discharged and recharged (3) extension set administration module (1) corresponding with, the battery pack that each battery unit (3) series connection constitutes is connected with main control module (2).
2. by the described lithium ion battery group of claim 1 balance charge/discharge management devices, it is characterized in that described main control module (2) is that a detection module (4) is connected with the full-bridge circuit that Q1-4 constitutes, one Mcu control unit (5) is connected with full-bridge circuit, Mcu control unit (5) also is connected with communication bus with detection module (4), and full-bridge circuit is connected with extension set administration module (1).
3. by the described lithium ion battery group of claim 1 balance charge/discharge management devices, it is characterized in that connecing after described extension set administration module (1) has a switch transformer (6) and rectification circuit (7) is connected the PWM processor controls (8) of Mcu control unit (5), PWM processor controls (8) connects each battery unit (3) of battery pack again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205979237U CN201904627U (en) | 2010-04-26 | 2010-11-09 | Balanced charging and discharging management device for lithium ion battery pack |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020170032 | 2010-04-26 | ||
| CN201020170032.3 | 2010-04-26 | ||
| CN2010205979237U CN201904627U (en) | 2010-04-26 | 2010-11-09 | Balanced charging and discharging management device for lithium ion battery pack |
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| CN201904627U true CN201904627U (en) | 2011-07-20 |
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| CN2010205979237U Expired - Fee Related CN201904627U (en) | 2010-04-26 | 2010-11-09 | Balanced charging and discharging management device for lithium ion battery pack |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105656105A (en) * | 2014-12-03 | 2016-06-08 | 国家电网公司 | Battery pack system |
| WO2023077701A1 (en) * | 2021-11-08 | 2023-05-11 | 西安快舟机电科技有限公司 | Tray charging and discharging switching circuit |
-
2010
- 2010-11-09 CN CN2010205979237U patent/CN201904627U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105656105A (en) * | 2014-12-03 | 2016-06-08 | 国家电网公司 | Battery pack system |
| CN105656105B (en) * | 2014-12-03 | 2018-01-02 | 国家电网公司 | battery pack system |
| WO2023077701A1 (en) * | 2021-11-08 | 2023-05-11 | 西安快舟机电科技有限公司 | Tray charging and discharging switching circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110720 Termination date: 20111109 |