CN105871037B - Battery management system and method - Google Patents

Battery management system and method Download PDF

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Publication number
CN105871037B
CN105871037B CN201610451398.XA CN201610451398A CN105871037B CN 105871037 B CN105871037 B CN 105871037B CN 201610451398 A CN201610451398 A CN 201610451398A CN 105871037 B CN105871037 B CN 105871037B
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China
Prior art keywords
substring
battery
management system
battery management
total
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CN201610451398.XA
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CN105871037A (en
Inventor
王俊毅
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Suzhou Hengmei Electronic Polytron Technologies Inc
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Suzhou Hengmei Electronic Polytron Technologies Inc
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Priority to CN201610451398.XA priority Critical patent/CN105871037B/en
Publication of CN105871037A publication Critical patent/CN105871037A/en
Priority to US15/437,138 priority patent/US20170373512A1/en
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Publication of CN105871037B publication Critical patent/CN105871037B/en
Priority to US17/506,906 priority patent/US20220055483A1/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0036Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
    • H02J7/0086
    • H02J7/0091
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00302Overcharge protection
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00306Overdischarge protection

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a kind of battery management system and method, which includes: battery pack, and the battery pack is formed in parallel by several substring batteries, and the substring battery is connected in series by several single batteries;Substring battery management system, the quantity of the substring battery management system is identical as the quantity of substring, and each tie point in every group of substring battery between single battery draws two conducting wires, wherein one directly connect with the substring battery management system, and another is then connect by thermistor with the substring battery management system;And total battery management system, total battery management system are connect with the control system of the substring battery management system and electric car.The present invention can have found temperature and voltage failure in the shortest time, and it is even on fire to avoid battery pack damage, improve the security performance of battery pack significantly.

Description

Battery management system and method
Technical field
The present invention relates to battery technology field, in particular to a kind of battery management system and method.
Background technique
Battery management system (BMS, Battery Management System) is between battery and automobile driving system The utilization rate of battery can be improved in tie, prevents battery from excessive charge and discharge phenomena occur, extends the service life of battery, monitors The state of battery.
Currently, the composition of the power battery pack of electric car is complex, usually elder generation by several minor comonomer batteries and is unified into The module of larger capacity is finally supplied from battery pack to motor then with many block coupled in series at the battery pack of required high voltage Electricity, or even there are also more complicated series-parallel schemes.Minor comonomer battery in above-mentioned module is since quantity is more, battery management system Be only capable of being monitored module, cannot specific to the voltage and temperature of each single battery, once a certain batteries because failure send out Heat, since heat transfer needs a period of time to get to nearest temperature sensor, BMS often fails to find failure in time, have Cause battery pack damage even automobile hidden danger on fire.If monitoring each section single battery, battery management system again excessively Bulky complex involves great expense, this is always an an open question.
Summary of the invention
The present invention provides a kind of battery management system and method, to solve above-mentioned particular problem existing in the prior art.
In order to solve the above technical problems, the present invention provides a kind of battery management system, comprising:
Battery pack, the battery pack are formed in parallel by several substring batteries, and the substring battery is by several single battery strings Join, the total voltage of substring battery is equal with battery pack total voltage;
The quantity of substring battery management system, the substring battery management system is identical as the quantity of the substring, and every Each tie point in group substring battery between single battery draws two conducting wires, wherein one directly with the substring cell tube The connection of reason system, another is then connect by thermistor with the substring battery management system;
And
Total battery management system, total battery management system and the substring battery management system and electric car Control system passes through two different CAN bus connections.
Preferably, being also connected with sample circuit between the substring battery management system and the single battery.
Preferably, the sub- battery management system and sample circuit are integrated into SoC (System on Chip) chip.
Preferably, being in series with a relay on every group of substring battery, the relay is by total battery management system System control.
Preferably, being connected between the substring battery management system and total battery management system by CAN bus.
Preferably, passing through another way CAN between total battery management system and the other control system of electric car Bus connection.
Preferably, the thermistor is attached on the single battery.
The present invention also provides a kind of battery management methods, using the battery management system, substring battery management system The working condition of system detection substring battery, so as to when the failure of unrepairable occurs in substring battery, to total battery management system Report, the latter disconnect the substring battery and other substring batteries;Total battery management system calculates the total current of battery pack, And with the substring battery management system cooperate, control charge and discharge when substring battery incision, cut out.
Preferably, total battery management system is up to the substring electricity of alarm for high voltage degree when battery pack charging Pond and other substring batteries disconnect, and this mode ensures that each substring battery is filled with.
Preferably, total battery management system is up to the substring electricity of low pressure alarming degree when battery pack electric discharge Pond and other substring batteries disconnect, with ensure automobile can normally travel as far as possible to charging station.
Compared with prior art, the invention has the following advantages that
1, the present invention may be implemented to be monitored the temperature and voltage of each single battery, this is previous battery management system What system was not accomplished.When a certain single battery breaks down, failure can be found within scheme more any than the past short time, It is even on fire to avoid battery pack damage, substantially increases the security performance of battery pack;
2, the present invention can apply the contracting to reduce cost using standard, modular SoC chip with mass production Small size lowers complexity, solves that monitor system that each single battery faces in the prior art excessively huge high Expensive problem;
3, the quantity of single battery, the quantity of substring battery can be adjusted according to actual needs, entire cell tube The assembling of reason system facilitates just as playing with building blocks, wide adaptation range;
4, single battery of the invention, which is disposably connected, reaches required voltage, forms substring battery, then by substring electricity Parallel connection reaches required capacity according to actual needs in pond, and the substring of brownout of going here and there is postponed and is incorporated to battery pack, thus will not be Electric current in generating inside battery pack, this interior electric current are where causing the hidden danger of fever, internal consumption.Battery proposed by the present invention Management system internal current can be zero when vehicle stops, because the relay of every a string of substrings can be disconnected.
Detailed description of the invention
Fig. 1 is the configuration diagram of substring battery in battery management system of the invention;
Fig. 2 is the connection relationship of total battery management system and substring battery management system in battery management system of the invention Figure.
It is as shown in the figure: 10- substring battery, 101- single battery, 20- substring battery management system, 30- thermistor, 40- Total battery management system, 50- sample circuit
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention Specific embodiment be described in detail.It should be noted that attached drawing of the present invention is all made of simplified form and uses non-essence Quasi- ratio, only for the purpose of facilitating and clarifying the purpose of the embodiments of the invention.
As shown in Figure 1 to Figure 2, the present invention provides a kind of battery management system, comprising:
Battery pack, the battery pack are formed in parallel by several substring batteries 10, and the substring battery 10 is by several monomer electricity Pond series connection 101 forms;
Substring battery management system 20, the quantity of the quantity of the substring battery management system 20 and the substring battery 10 It is identical, and in every group of substring battery 10 single battery 101 each tie point draw two conducting wires, wherein one directly with it is described For the connection of substring battery management system 20 to measure monomer voltage, another then passes through thermistor 30 and the substring battery management System 20 connects, and the thermistor 30 is attached on the single battery 101 with precise measurement monomer temperature;Specifically, institute It states substring battery management system 20 to be used to measure the voltage of each monomer, temperature in corresponding substring battery 10, calculating should (State Of Power, SOP refer to lower a period of time to SOC (battery charging state), SOH (service life of battery) and the SOP of substring battery Carve such as next 2 seconds, 10 seconds, 30 seconds maximum discharge powers being capable of providing with battery when lasting heavy-current discharge Or the power being electrically charged), the single battery 101 there are failure is alarmed and handled, to monomer electricity each in substring battery Pond 101 carries out active and passive equilibrium, while communicating with total battery management system 40;
And
Total battery management system 40, total battery management system 40 and the substring battery management system 20 and electronic The other control system of automobile passes through two different CAN bus connections.Total battery management system 40 passes through electric with substring The communication of pond management system 20 is realized to the incision of each substring battery 10, is cut out and the communication with other controllers in automobile. When the failure of unrepairable occurs to a certain substring battery 10 in (temperature, electric voltage exception) for some reason, which is entirely cut It limits in addition to battery pack out, while to the power of vehicle, and then is repaired to car owner's time enough.
Preferably, being also connected with sample circuit between the substring battery management system 20 and the single battery string 10 50, further, the sub- battery management system 20 can integrate with sample circuit 50 as SoC (System on Chip) core Piece, to reduce volume, reduce cost.
Preferably, being in series with a relay on every group of substring battery 10, the relay is by total battery management System 40 controls, and in other words, in practical applications, can according to circumstances determine whether the substring battery 10 needs to seal in, this It is to be realized by using the relay.
Preferably, passing through CAN bus between the substring battery management system 20 and total battery management system 40 Connection is connected between total battery management system 40 and the general control system of electric car by another CAN bus, is realized The interaction of information, and then preferably manage entire battery pack.
With continued reference to Fig. 1 and Fig. 2, the present invention also provides a kind of battery management methods, using the battery management system System, specifically: due to battery pack of the invention, single single battery 101 is directly connected into the substring of required high voltage Battery 10, and independent standardized substring battery management system 20 is used on substring battery 10, in this way, each section monomer The voltage of battery 101, temperature, SOC, equilibrium are all monitored.Entire battery pack it is in parallel by several such substring batteries 10 and At, then by the relatively simple total management of the battery management system 40 substring battery management system 20 of a function, by substring cell tube Reason system 20 manages substring battery 10.When several or dozens of substring battery 10 and when being unified into battery pack, each substring battery 10 Total voltage it is not necessarily equal (can accurately be measured when the relay of every string is not switched on), and each substring battery 10 is total Voltage is calculated by the voltage addition of concatenated all single batteries.Therefore, the substring battery low in order to avoid voltage 10 load as composition battery pack after other 10 parallel connections of substring battery, can suitably postpone the substring battery 10 of low-voltage simultaneously At the time of entering battery pack, namely start electric discharge when, the low substring battery 10 of voltage is first not incorporated in way circuit, waits the substring battery 10 Voltage it is equal with the voltage of other substring batteries 10 when be incorporated to again.Electricity can also be switched out in short term in electric discharge operational process Press through low substring battery 10.
In other words, battery management system of the invention can be in electric discharge, by the substring battery 10 of brownout alarm It disconnects.Since the capacity of every substring battery 10 is little, having lacked a string of battery pack performance influences less, or can at least cooperate Limit power enables driver that vehicle is reached charging station.And in charging, the substring battery 10 filled with can be switched out, in this way may be used To achieve the purpose that each substring battery 10 is all filled.Certainly, charger cooperation adjustment charging current is needed during this.Such as This, energy wave caused by balanced cost is far below general active equalization in the past, while no big euqalizing current is inevitable Take, and depth of discharge also increased.Substitution as suggested in the present invention scheme balanced in the past is likely to become balanced in the future Mainstream.
Obviously, those skilled in the art can carry out various modification and variations without departing from spirit of the invention to invention And range.If in this way, these modifications and changes of the present invention belong to the claims in the present invention and its equivalent technologies range it Interior, then the invention is also intended to include including these modification and variations.

Claims (7)

1. a kind of battery management system characterized by comprising
Battery pack, the battery pack are formed in parallel by several substring batteries, the substring battery connected by several single batteries and At the total voltage of substring battery is equal with battery pack total voltage;
The quantity of substring battery management system, the substring battery management system is identical as the quantity of substring, and every group of substring electricity Each tie point in pond between single battery draws two conducting wires, wherein one directly connects with the substring battery management system Connect, another is then connect with the substring battery management system by thermistor, the substring battery management system with it is described Be also connected with sample circuit between single battery, the substring battery management system to the voltage of each section single battery, temperature, SOC, equilibrium are monitored and handle, and communicate with total battery management system;
The sub- battery management system and sample circuit are integrated into SoC (System on Chip) chip, the thermistor patch It is attached on the single battery;
And
Other of total battery management system, total battery management system and the substring battery management system and electric car Controller connection, total battery management system are realized by the communication with substring battery management system to each substring battery It cuts, cut out and the communication with other controllers in automobile.
2. battery management system as described in claim 1, which is characterized in that be in series with a relay on every group of substring battery Device, the relay are controlled by total battery management system.
3. battery management system as described in claim 1, which is characterized in that the substring battery management system and total electricity It is connected between the management system of pond by CAN bus.
4. battery management system as described in claim 1, which is characterized in that total battery management system and electric car It is connected between other control system by another CAN bus.
5. a kind of battery management method, using the battery management system as described in claim 1-4 any one, feature exists The working condition of substring battery is detected in, substring battery management system, so as to when there is the failure of unrepairable in substring battery, Total battery management system disconnects the substring battery and other substring batteries;Total battery management system is in charging and discharging When, according to strategy incision, cut out relevant substring battery.
6. battery management method as claimed in claim 5, which is characterized in that when battery pack charging, total battery management System is up to the substring battery of alarm for high voltage degree and other substring batteries disconnect, to ensure that all substring batteries can be by It is full of.
7. battery management method as claimed in claim 6, which is characterized in that when battery pack electric discharge, total battery management System is up to the substring battery of low pressure alarming degree and other substring batteries disconnect, to ensure that automobile being capable of row as normal as possible Sail to charging station.
CN201610451398.XA 2016-06-21 2016-06-21 Battery management system and method Active CN105871037B (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201610451398.XA CN105871037B (en) 2016-06-21 2016-06-21 Battery management system and method
US15/437,138 US20170373512A1 (en) 2016-06-21 2017-02-20 First Series Then Parallel Battery Pack System
US17/506,906 US20220055483A1 (en) 2016-06-21 2021-10-21 First series then parallel battery pack system

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Application Number Priority Date Filing Date Title
CN201610451398.XA CN105871037B (en) 2016-06-21 2016-06-21 Battery management system and method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106740179A (en) * 2016-11-30 2017-05-31 王俊毅 A kind of battery system framework, battery system, electric automobile and battery system control strategy
CN108879835A (en) * 2018-06-27 2018-11-23 翊工动力科技(上海)有限公司 A kind of lithium battery intelligent connection method of lithium battery management system
CN114148205A (en) * 2021-11-29 2022-03-08 四川驹马科技有限公司 Standard battery pack communication method suitable for new energy automobile

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CN203218398U (en) * 2013-03-22 2013-09-25 万向电动汽车有限公司 Power battery management system of electric automobile

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CN201839036U (en) * 2010-10-27 2011-05-18 哈尔滨冠拓电源设备有限公司 Lithium-powered battery pack management system
CN102231550B (en) * 2011-07-05 2014-11-19 张化锴 Active charge/discharge balancing system of power battery and implementation method thereof
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Publication number Priority date Publication date Assignee Title
CN102361099A (en) * 2011-07-29 2012-02-22 南京华博科技有限公司 Balancing control system and method for cell array
CN203218398U (en) * 2013-03-22 2013-09-25 万向电动汽车有限公司 Power battery management system of electric automobile

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