CN106772093A - Battery pack sampling system and battery management system - Google Patents

Battery pack sampling system and battery management system Download PDF

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Publication number
CN106772093A
CN106772093A CN201710005854.2A CN201710005854A CN106772093A CN 106772093 A CN106772093 A CN 106772093A CN 201710005854 A CN201710005854 A CN 201710005854A CN 106772093 A CN106772093 A CN 106772093A
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China
Prior art keywords
battery
sampling
battery pack
unit
information
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Pending
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CN201710005854.2A
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Chinese (zh)
Inventor
乔森林
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Shandong Heng Heng Electronic Technology Co Ltd
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Shandong Heng Heng Electronic Technology Co Ltd
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Publication date
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Priority to CN201710005854.2A priority Critical patent/CN106772093A/en
Publication of CN106772093A publication Critical patent/CN106772093A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery

Abstract

Battery pack sampling system provided in an embodiment of the present invention and battery management system, the battery pack sampling system includes battery pack and sampling unit, battery pack includes multiple battery modules, battery pack is electrically connected with sampling unit, and sampling unit is used to gather the information of voltage and temperature information of battery pack.Sampling unit includes multiple collecting units and communication unit, and multiple collecting units are electrically connected with multiple battery modules one by one, the information of voltage and temperature information for gathering battery modules.Communication unit is used to receive information of voltage and temperature information that collecting unit is collected with multiple collecting unit cascades, communication unit.Each collecting unit is electrically connected with a battery modules, and the information of voltage and temperature information of one battery modules are acquired by each collecting unit.Because each collecting unit only gathers an information for battery modules, there is provided a kind of working environment of low pressure, potential safety hazard is reduced.

Description

Battery pack sampling system and battery management system
Technical field
The present invention relates to cell art, in particular to a kind of battery pack sampling system and battery management system.
Background technology
Energy problem is the subject matter that fuel-engined vehicle faces.Electric vehicle is from the battery of single vehicular energy Power is obtained, using motor as motive power, vehicle traveling is driven.Because electric vehicle belongs to " zero-emission " vehicle, noise is small, Comfortable clean and easily operated and maintenance, the substitute as the best fuel combustion vehicle of present development prospect.
In electric vehicle, key technology is battery, but due to the distinctive chemical property of battery, the security of battery Also there is hidden danger with stability aspect, such as too high gentle overcharging may all burn or set off an explosion, and overdischarge may make Into battery damage in itself.
In order to ensure the security that battery is used, improve battery in itself material property and strengthening process control it is same When, battery management system also turns into the most important thing of research.Battery management system is generally used for detecting voltage, the temperature of battery pack And dump energy, judge battery pack whether occur visitor overcharge, national defence, excess temperature, excessively stream and situations such as short circuit, and close in good time Battery pack, with the damage for avoiding causing battery pack.
Existing battery management system, including from plate, hardboard and master control borad.It is right to be realized as collecting unit from plate The data acquisition of battery pack, each includes multiple sampling A/D chips from plate, and multiple PACK modules voltages and temperature information are transmitted to one Block is transmitted to master control borad from plate by from plate.
But this mode has a problem that, due to one from plate need multiple battery modules are sampled, due to , it is necessary to concentrate assembling sampling wire harness, in high pressure conditions, there is certain safety hidden when battery is constituted and wrapped in multiple battery modules Suffer from.
The content of the invention
It is an object of the invention to provide a kind of battery pack sampling system and battery management system, to solve the above problems.
In a first aspect, the invention provides a kind of battery pack sampling system, being applied to battery management system, the battery pack Sampling system includes battery pack and sampling unit, and the battery pack includes multiple battery modules, and the battery pack is adopted with described Sample unit is electrically connected, and the sampling unit is used to gather the information of voltage and temperature information of the battery pack.The sampling is single Unit includes multiple collecting units and communication unit, and the multiple collecting unit is electrically connected with the multiple battery modules one by one Connect, the information of voltage and temperature information for gathering the battery modules.The communication unit and the multiple collection Unit cascade, the communication unit is used to receive the information of voltage and temperature information that the collecting unit is collected.
Further, the battery pack is multiple, and the quantity of the sampling unit is identical with the quantity of the battery pack, and Communication is realized by CAN between the communication unit of each sampling unit.
Further, the quantity of the multiple battery modules is N, and the sampling unit includes N-1 collecting unit and 1 Individual communication unit is that N is more than 1.
Further, the collecting unit include the first acquisition chip, the communication unit include the second acquisition chip with And communication chip, first acquisition chip electrically connects with second acquisition chip and the battery pack respectively, and described Two acquisition chips are connected with the communication chip.
Further, communicated by SPI between second acquisition chip and communication chip.
Further, first acquisition chip and the second acquisition chip are LTC6804 chips, the communication chip It is MC9S12G128 chips.
Further, each battery modules in the multiple battery modules include the battery core of multiple series connection, described The sampling parameter of LTC6804 chips is configured according to the number of the multiple series connection battery core.
Further, the quantity of the multiple series connection battery core is at least 6, up to 12.
Second aspect, the embodiment of the invention provides a kind of battery management system, it is characterised in that including mainboard and electricity Pond group sampling system, the communication unit in the battery pack sampling system is electrically connected with the mainboard, described for transmitting Information of voltage and temperature information are to the mainboard.
Further, the communication mainboard is communicated with the mainboard by CAN.
The beneficial effect of the embodiment of the present invention is:
A kind of battery pack sampling system provided in an embodiment of the present invention and battery management system, sampling unit are adopted including multiple Collection unit and communication unit, each collecting unit is electrically connected with a battery modules, by each collecting unit to a battery The information of voltage and temperature information of module are acquired.Because each collecting unit only gathers an information for battery modules, There is provided a kind of working environment of low pressure, reduce potential safety hazard.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be attached to what is used needed for embodiment Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, thus be not construed as it is right The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this A little accompanying drawings obtain other related accompanying drawings.
Fig. 1 is the structural representation of the battery management system of prior art;
A kind of structural representation of battery pack sampling system that Fig. 2 is provided for present pre-ferred embodiments;
The structural representation of another battery pack sampling system that Fig. 3 is provided for present pre-ferred embodiments;
The structural representation of the battery management system system that Fig. 4 is provided for present pre-ferred embodiments.
Icon:100- battery management systems;110- mainboards;120- is from plate;130- hardboards;130- battery packs;131- electricity Pond module;200- battery pack sampling systems;210- sampling units;220- collecting units;The acquisition chips of 221- first;230- is communicated Unit;The acquisition chips of 231- second;233- communication chips;300- battery management systems.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is A part of embodiment of the present invention, rather than whole embodiments.Present invention implementation generally described and illustrated in accompanying drawing herein The component of example can be arranged and designed with a variety of configurations.
Therefore, the detailed description of embodiments of the invention below to providing in the accompanying drawings is not intended to limit claimed The scope of the present invention, but be merely representative of selected embodiment of the invention.Based on the embodiment in the present invention, this area is common The every other embodiment that technical staff is obtained under the premise of creative work is not made, belongs to the model of present invention protection Enclose.
It should be noted that:Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi It is defined in individual accompanying drawing, then it need not be further defined and explained in subsequent accompanying drawing.
Term " first ", " second " etc. are only used for distinguishing description, and it is not intended that indicating or implying relative importance.
In the description of the invention, in addition it is also necessary to explanation, unless otherwise clearly defined and limited, term " coupling ", " connected ", " connection " should be interpreted broadly, for example, it may be being fixedly connected, or being detachably connected, or integratedly connect Connect;Can mechanically connect, or electrically connect;Can be joined directly together, it is also possible to be indirectly connected to by intermediary, can Being two connections of element internal.For the ordinary skill in the art, above-mentioned term can be understood with concrete condition Concrete meaning in the present invention.
Other features and advantages of the present invention will illustrate in subsequent specification, also, partly become from specification It is clear that or being understood by implementing the embodiment of the present invention.The purpose of the present invention and other advantages can be by being write Specifically noted structure is realized and obtained in specification, claims and accompanying drawing.
With the development and the popularization of automobile of society, the living trip to us brings great convenience.Bringing While convenience, many negative effects are also brought, environmental protection and the energy are exactly two aspects of most important of which.In order to reduce vapour Car pollutes, and energy resource consumption.Noise is small, discharge few electric automobile arises at the historic moment.
Electric automobile is at least to use a kind of power source as vehicle power, all or part of by motor-driven automobile, Including using high-energy power accumulator as the pure electric automobile of main power source, using internal combustion engine and high power power electric power storage Mixed power electric car and the fuel cell car three types with hydrogen as onboard fuel that pond drives jointly.In electronic vapour In the research of car, battery pack as electric automobile heart, be related to once charge continual mileage, the startup of electric motor car, plus Speed and climbing capacity etc..Battery pack has apparent non-linear and time-varying characteristics, the characteristic such as capacity, maximum of battery various aspects Charge, discharge power, equivalent internal resistance etc. can not determine only by the test of upper Chinese herbaceous peony, because they are in vehicle traveling process Be able to can also be changed with the change of the factors such as life-span, the charging and discharging state of battery, battery pack.So battery management system is just It is particularly important, receives extensive concern.The most important function of battery management system has:
Firstth, the parameter information such as the total voltage of Real-time Collection battery pack, module voltage, loop current, battery temperature, and will These information are transmitted by communication bus to vehicle management system;
Secondth, by the detection of the running state parameter to battery system, if the value of parameter exceedes safe range, such as Stagnation pressure is excessive, then be considered as there occurs the failure of battery system, can send failure shape to vehicle management system by bus State code is alarmed, and carries out corresponding troubleshooting measure, for example, can temporarily forbid energy feedback, only allows the energy content of battery Output, with battery total voltage.
3rd, when vehicle runs, battery charge state be battery management system to vehicle management system transmit it is important One of information, vehicle management system determines how many energy, Huo Zhexiang are obtained from battery according to current battery charge state Battery feeds back how many energy.Simultaneously for battery in itself for, the electrical characteristics of battery are relevant with battery charge state.For example, electric The internal resistance in pond is smaller in medium battery state-of-charge, but when battery charge state is close to 0% or 100%, there is larger amplitude The increase of degree, therefore, the accurate estimation of battery charge state will have influence on the power performance of vehicle, in addition security quality, Meaning is very great.
Fig. 1 is referred to, is the structural representation of the battery management system 100 of prior art, existing battery management system 100, including from plate 120 and mainboard 110, battery pack 130, multiple battery cores are included in battery pack 130, between multiple battery cores It is serially connected, and according to actual conditions, by the packet of multiple battery cores, each group is a battery modules 131, comprising a fixed number The battery core of amount a, battery case includes multiple battery modules 131.From plate 120 as realizing adopting the data of battery pack 130 Collection, each includes the voltage and temperature information for being used for gathering one or more battery module 131 from plate 120, then is passed by from plate 120 Transport to mainboard 110.For example, a battery pack includes 100 battery cores, 100 battery cores are divided into ten groups, every group there are ten battery cores. It it is 3 pieces from the quantity of plate, first piece is used to gather the first Battery pack module, the second Battery pack module, the 3rd Battery pack mould from plate The information of voltage and temperature information of group and the 4th Battery pack module;Second piece from plate be used for gather the 5th Battery pack module, The information of voltage and temperature information of the 6th Battery pack module and the 7th Battery pack module;3rd piece is used to gather the 8th from plate The information of voltage and temperature information of Battery pack module, the 9th Battery pack module and the tenth Battery pack module.First piece from plate, Second piece total by communication bus such as CAN from plate and the 3rd piece of information of voltage that will be collected again from plate and temperature information Line is transmitted to mainboard i.e. vehicle management system, and treatment is analyzed to information of voltage and temperature information.
But this mode has a problem that, need to adopt multiple battery modules 131 from plate 120 due to one Sample, because multiple battery modules 131 assemble sampling wire harness in 130 one-tenth bags of battery pack, it is necessary to concentrate, is concentrating assembling sampling line , in high pressure conditions, there is certain potential safety hazard in Shu Shi.
In view of this, inventor is by long-term research and constantly explores, and proposes electricity provided in an embodiment of the present invention Pond group sampling system and battery management system, to solve the above problems.
First embodiment
Refer to Fig. 2, a kind of structured flowchart of battery pack sampling system 200 that Fig. 2 is provided for present pre-ferred embodiments, The battery pack 130 of battery pack sampling system 200 and sampling unit 210, the sampling unit 210 and the electricity of the battery pack 130 Connection, information of voltage and temperature information for gathering the battery pack 130.
Because the voltage of each battery core is smaller.It is not enough to drive electric motor car, therefore in order to provide sufficiently large voltage, institute State battery pack 130 and include multiple battery cores, be connected in series between multiple battery cores, wherein, a number of battery core combination, as Battery modules 131.Used as a kind of implementation method, the battery core quantity that each battery modules 131 is included is any one in 6-12.
To make it clear, be illustrated for the relation of battery pack 130 and battery modules 131 and battery core, For example, a battery case needs to reach sufficiently large voltage, it is necessary to 100 battery cores are divided into ten by 100 battery core series connection Group, every group includes ten battery cores, and this battery case just contains ten battery modules, respectively the first battery modules, the second electricity Pond module, the 3rd battery modules ... and the tenth battery modules.
Certainly, this is a kind of implementation method, can not be interpreted as here to the number of battery core, classification in battery pack 130 Situation and battery modules 131 are limited, and this programme includes any battery core of battery pack 130 that can realize the purpose of the present invention Group technology.
The sampling unit 210 is used to gather the information of voltage and temperature information of the battery modules 131, including multiple Collecting unit 220 and communication unit 230, the multiple collecting unit 220 are electrically connected with the multiple battery modules 131 respectively Connect.The multiple collecting unit 220 of the communication unit 230 is cascaded, specifically, for example, sampling unit 210 includes N number of collection Unit 220 and a communication unit 230, communication unit 230 are sampling node 1, by twisted-pair feeder and a sampling unit 210 Cascaded, formed sampling node 2 ... ..., by that analogy, communication unit 230 is cascaded with n-th sampling unit 210, shape Into sampling node n.Additionally, communication unit 230 is also connected with battery modules 131, the communication unit 230 is used to receive described adopting Collection unit 220 information of voltage and temperature information that collect, and directly gather the information of voltage of battery modules 131 with And temperature information.
Each of which collecting unit 220 and each communication unit 230 correspond to one battery modules 131 of collection Information of voltage and temperature information.
Further, because the cost of communication unit 230 is higher, for cost-effective and its accounting in battery case According to space, sampling unit 210 includes a communication unit 230 and multiple collecting units 220.If a battery pack The quantity of the battery modules 131 included in 130 is N, then sampling unit 210 is logical including N-1 collecting unit 220 and 1 News unit 230, wherein N is the integer more than 1.
Collecting unit 220 includes the first acquisition chip 221, and specifically, the first acquisition chip 221 can be adopted for LTC6804 Sample chip, LTC6804 sampling A/D chips can at most gather 12 tunnel battery core voltages.Specifically, can be according to the electricity of battery modules 131 Core series connection joint number, configures LTC6804 sampling A/D chip parameters, realizes sampling and 1 to the 5 road temperature acquisitions of the string battery cores of collection 6 to 12. LTC6804 sampling A/D chips have the overall measurement error less than 1.2mv, and relatively low data acquisition rate can be selected to be made an uproar to realize height The suppression of sound, LTC6804 chips provide two kinds of communication patterns of ISOSPI and SPI, and the twisted-pair feeder cascade system of support uploads voltage With temperature information and receive MOS detection and equalization command.LTC6804 chips have dormancy, await orders and the filling such as test, by not The purpose of power consumption is saved in the completion measurement reached with the switching of state.
Further, LTC6804 chips also include NTC sensor, and the collection of temperature information is realized by NTC sensor And transmission.
Communication unit 230 includes the second acquisition chip 231 and communication chip 233, and the second acquisition chip 231 is LTC6804 sampling A/D chips and a MC9S12G128 chips composition.
Second acquisition chip 231 uses LTC6804 sampling A/D chips, gathers most 12 tunnel battery core voltages;Comprising NTC sensings Device, can at most gather 5 road temperature informations, the battery core series connection joint number according to battery mould 131, configure LTC6804 sampling A/D chip parameters, Realize sampling and 1 to the 5 road temperature acquisitions of the string battery core of collection 6 to 12.
Using MC9S12G128 chips, communicated by SPI, voltage and temperature for receiving the collection of LTC6804 sampling A/D chips Degree information, sends MOS orders and equalization command, and by itself CAN communication, the information that will be received is uploaded.
Can be according to the requirement of battery modules 131 in present pre-ferred embodiments, cascade before and after being realized by twisted-pair feeder, side Just it is flexible to gather battery core voltage.
Further, because the vehicle of different automobile types is different to the cell voltage of needs, some Large Electric vehicles may Bigger voltage is needed to provide power, but, due to each battery case, the volume of itself is designed, it is therefore desirable to Duo Ge electricity Pond case.
Fig. 2 and Fig. 3 is referred to, is another knot of the battery pack sampling system 200 that present pre-ferred embodiments are provided Structure schematic diagram.
Battery pack sampling system 200 includes multiple battery packs 130, and multiple sampling units 210, sampling unit 210 Quantity is identical with the quantity of battery case.If the quantity of battery case is three, then the quantity of sampling unit 210 is also three.Each Sampling unit 210 includes at least one communication unit 230, and communication is realized by CAN between each communication unit 230.Often Individual sampling unit 210 includes communication unit 230 and multiple collecting units 220, communication unit 230 and multiple collecting units 220 are cascaded successively by twisted-pair feeder.
It is elementary cell to sample from plate 120 with the development of battery bag modularity technology, and battery bag modularity Front-end sampling system, implements that comparing is clumsy, and there is certain potential safety hazard.
The battery pack sampling system 200 that present pre-ferred embodiments are provided, sampling unit 210 includes multiple collecting units 220 and communication unit 230, each collecting unit 220 is electrically connected with a battery modules 131, by each collecting unit 220 pairs The information of voltage and temperature information of one battery modules 131 are acquired.Due to each collecting unit 220 collections, one electricity The information of pond module 131, the data sampling of the convenient, flexible information of voltage and temperature information of realizing each module, and realize Data transfer between multiple collecting units 220, improves the security of production, and reduces cost.
Second embodiment
Fig. 4 is referred to, is the battery management system 300 that present pre-ferred embodiments are provided, the battery management system 300 is wrapped Include battery pack sampling system 200 and mainboard 110.Battery pack sampling system 200 is identical with previous embodiment, here no longer Repeat one by one.
The communication unit 230 in the battery pack sampling system 200 is electrically connected with the mainboard 110, for transmitting The information of voltage and temperature information are to the mainboard 110.Mainboard 110 is used to receive the voltage letter of the transmission of communication unit 230 Breath and temperature information, and information of voltage and temperature information to receiving process, and battery pack 130 is in a monkey The state of that balance of son and safety.
Further, the communication unit 230 is communicated with the mainboard 110 by CAN.
CAN is a kind of serial data communication agreement, solves data exchange in electric automobile between each device Problem.CAN is that communication data is encoded, and is encoded rather than traditional station address.The identifier of data block includes:29 Position CAN2.OB or CAN2.OA.Using binary number representation, so reaching 229 or 221 data blocks.This mode can be same One moment allowed different sampling nodes to receive same data, using widely in distributed battery management system.Communication Realize communicating by CAN between unit 230 and between communication unit 230 and collecting unit 220, because CAN is total Line has the advantages that communication speed is fast, reliability is high, and CAN has the characteristics that:First, communication mode is flexible, and not The nodal informations such as address are needed, multi-level backup system is constituted very convenient;Second, its nodal information is divided into different priority, Ensureing the data of high priority can transmit within the most short time, so as to meet different requirement of real time;3rd, support various numbers According to transmission means;4th, transmission medium is not specified by, can be coaxial cable, twisted-pair feeder or optical fiber, there is very flexible choosing Selecting property;5th, when there is gross error, node can be automatically switched off output function, from without influenceing other nodes.
In sum, a kind of battery pack sampling system 200 provided in an embodiment of the present invention and battery management system 300, adopt Sample unit 210 includes multiple collecting units 220 and communication unit 230, each collecting unit 220 and a battery modules 131 Electrical connection, is acquired by the information of voltage and temperature information of battery modules 131 of each collecting unit 220 pair.Due to One information of battery modules 131 of collection of each collecting unit 220, the convenient, flexible information of voltage for realizing each module with And the data sampling of temperature information, and the data transfer between multiple collecting units 220 is realized, the security of production is improve, And reduce cost.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for the skill of this area For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair Change, equivalent, improvement etc., should be included within the scope of the present invention.

Claims (10)

1. a kind of battery pack sampling system, it is characterised in that be applied to battery management system, the battery pack sampling system includes Battery pack and sampling unit, the battery pack include multiple battery modules, and the battery pack is electrically connected with the sampling unit, The sampling unit is used to gather the information of voltage and temperature information of the battery pack;
The sampling unit includes multiple collecting units and communication unit, the multiple collecting unit one by one with it is the multiple Battery modules are electrically connected, the information of voltage and temperature information for gathering the battery modules;
The communication unit is cascaded with the multiple collecting unit, and the communication unit is collected for receiving the collecting unit The information of voltage and temperature information.
2. battery pack sampling system according to claim 1, it is characterised in that the battery pack is multiple, the sampling The quantity of unit is identical with the quantity of the battery pack, and passes through CAN between the communication unit of each sampling unit Bus realizes communication.
3. battery pack sampling system according to claim 1, it is characterised in that the quantity of the multiple battery modules is N, The sampling unit includes that N-1 collecting unit and 1 communication unit are, N is more than 1.
4. battery pack sampling system according to claim 1, it is characterised in that the collecting unit includes the first collection core Piece, the communication unit includes the second acquisition chip and communication chip, and first acquisition chip is adopted with described second respectively Collection chip and battery pack electrical connection, second acquisition chip are connected with the communication chip.
5. battery pack sampling system according to claim 4, it is characterised in that second acquisition chip and communication core Communicated by SPI between piece.
6. battery pack sampling system according to claim 4, it is characterised in that first acquisition chip and second adopt Collection chip is LTC6804 chips, and the communication chip is MC9S12G128 chips.
7. battery pack sampling system according to claim 6, it is characterised in that each electricity in the multiple battery modules Pond module includes multiple series connection battery cores, the number of the sampling parameter of the LTC6804 chips according to the multiple series connection battery core Configured.
8. battery pack sampling system according to claim 6, it is characterised in that the quantity of the multiple series connection battery core is at least It is 6, up to 12.
9. a kind of battery management system, it is characterised in that including the battery pack sampling system described in mainboard and claim 1, The communication unit in the battery pack sampling system is electrically connected with the mainboard, for transmitting the information of voltage and temperature Degree information is to the mainboard.
10. battery management system according to claim 9, it is characterised in that the communication unit passes through with the mainboard CAN is communicated.
CN201710005854.2A 2017-01-04 2017-01-04 Battery pack sampling system and battery management system Pending CN106772093A (en)

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CN111123134A (en) * 2020-01-14 2020-05-08 东南大学 Marine lithium battery health management system based on multilevel temperature monitoring and internal resistance measurement and calculation
CN111169321A (en) * 2018-11-09 2020-05-19 宝沃汽车(中国)有限公司 Control method for automobile, battery pack and battery information acquisition system
CN112086696A (en) * 2020-09-15 2020-12-15 安徽江淮汽车集团股份有限公司 Battery pack management system for new energy automobile

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