CN206540956U - A kind of voltage acquisition system for battery pack framework - Google Patents

A kind of voltage acquisition system for battery pack framework Download PDF

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Publication number
CN206540956U
CN206540956U CN201720249879.2U CN201720249879U CN206540956U CN 206540956 U CN206540956 U CN 206540956U CN 201720249879 U CN201720249879 U CN 201720249879U CN 206540956 U CN206540956 U CN 206540956U
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China
Prior art keywords
voltage
module
acquisition
isolation module
battery
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Expired - Fee Related
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CN201720249879.2U
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Chinese (zh)
Inventor
丁更新
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Anhui Jianghuai Automobile Group Corp
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Anhui Jianghuai Automobile Group Corp
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Abstract

The utility model provides a kind of voltage acquisition system for battery pack framework, the battery pack is composed in series by one or more battery module, battery modules are made up of multiple cells, and each battery modules carries out voltage acquisition by the voltage acquisition module connected one to one, including:First high_voltage isolation module, the second high_voltage isolation module and primary processor.Each voltage acquisition module is according to passing through I2C buses are sequentially connected according to chrysanthemum chain pattern head and the tail, and the voltage acquisition module positioned at end passes through I2C buses are connected with the input of the first high_voltage isolation module, and the voltage acquisition module positioned at head end passes through I2C buses are connected with the input of the second high_voltage isolation module.Primary processor obtains the voltage of each cell by the first high_voltage isolation module and the second high_voltage isolation module.When the existing System of voltage acquisition of the utility model communicates disconnection between voltage acquisition chip, it is impossible to the problem of accurately obtaining monomer voltage, high battery management system framework layout can be made more reasonable.

Description

A kind of voltage acquisition system for battery pack framework
Technical field
The utility model is related to electrokinetic cell voltage acquisition field, more particularly to a kind of voltage acquisition system for battery pack frame Structure.
Background technology
Battery management system is the core component of electric automobile, and it is mainly used in monomer electricity in monitoring electrokinetic cell bag The voltage in pond and the total voltage of electrokinetic cell bag, therefore, battery management system will be directly affected for battery voltage collection Combination property.The current collection to each monomer battery voltage value in battery pack, which is typically powered, presses acquisition chip to enter cell Row voltage acquisition, and each voltage acquisition chip is passed through into I2C buses are sequentially connected according to chrysanthemum chain pattern head and the tail, positioned at end Voltage acquisition chip passes through I2The I of C buses and high_voltage isolation module2After C-terminal mouthful connection, then with the core in battery management system Component primary processor realizes communication.But this framework is in the I of some voltage acquisition chip2The interruption of C order circuits, will lead Cause the interruption of whole high pressure information circuits, just occur the information of voltage before the breakpoint be can not pass back to isolation module and Primary processor, the loop that can cause whole communication system is abnormal, and battery management system can not gather accurate monomer voltage, And then influence the safety of power vehicle.
Utility model content
The utility model provides a kind of voltage acquisition system for battery pack framework, solves existing batteries monomer voltage acquisition and exists When communicating disconnection between voltage acquisition chip, it is impossible to accurately obtain monomer voltage, the problem of influence electrokinetic cell is safe can make height Battery management system framework layout is more reasonable.
To realize object above, the utility model provides following technical scheme:
A kind of voltage acquisition system for battery pack framework, the battery pack is composed in series by one or more battery module, institute State battery modules to be made up of multiple cells, each described battery modules is carried out by the voltage acquisition module connected one to one Voltage acquisition, including:First high_voltage isolation module, the second high_voltage isolation module and primary processor;
Each described voltage acquisition module is according to passing through I2C buses are sequentially connected according to chrysanthemum chain pattern head and the tail, positioned at end The voltage acquisition module at end passes through I2C buses are connected with the input of the first high_voltage isolation module, positioned at the voltage of head end Acquisition module passes through I2C buses are connected with the input of the second high_voltage isolation module;
The first input end of the primary processor is connected with the output end of the first high_voltage isolation module, the main process task Second input of device is connected with the output end of the second high_voltage isolation module;
The primary processor obtains each list by the first high_voltage isolation module and the second high_voltage isolation module The voltage of body battery.
It is preferred that, the voltage acquisition module includes:AD AD conversion units, Acquisition Circuit, acquisition chip;
The output end of the Acquisition Circuit is connected with the input of the AD AD conversion units, the acquisition chip it is defeated Enter end with the output end of the AD AD conversion units to be connected;
The Acquisition Circuit is used to carry out each cells of the battery modules monomer voltage collection, and by each Monomer voltage is sent to the AD AD conversion units.
It is preferred that, the acquisition chip includes I2C serial ports, the corresponding acquisition chip of each described battery modules passes through described I2C serial ports is connected.
It is preferred that, the voltage acquisition module also includes:Voltage balancing module;
The voltage balancing module is serially connected in the two ends of cell, when battery pack is charged, if the battery The voltage of cell in module is inconsistent, and the acquisition chip controls the voltage balancing module to consume the cell Power so that the monomer voltage in battery modules is consistent.
It is preferred that, the voltage balancing module includes:Discharge resistance and switch element;
The discharge resistance and the switch element are serially connected in the two ends of cell, the control end of the switch element with The output end of the acquisition chip is connected, and when battery pack charges, the acquisition chip is according to the monomer voltage controlling switch Element carries out power consumption to corresponding cell.
It is preferred that, the first high_voltage isolation module and the second high_voltage isolation module are high_voltage isolation chip.
It is preferred that, the primary processor includes:Numbering acquiring unit and reading control unit;
The numbering acquiring unit is used to receive the battery modules numbering that each described acquisition chip is sent;
The control unit that reads judges whether all to obtain each battery modules pair in battery pack according to the numbering The numbering answered, in this way, then the reading control unit obtains each cell by the first high_voltage isolation module Voltage, otherwise, it is described reading control unit simultaneously obtained by the first high_voltage isolation module and second isolation module Take the voltage of each cell.
The utility model provides a kind of voltage acquisition system for battery pack framework, and voltage acquisition module uses the first high_voltage isolation Module and the second high_voltage isolation module transmit the monomer voltage of battery pack to primary processor respectively.Solve existing batteries monomer electricity When pressure collection communicates disconnection between voltage acquisition chip, it is impossible to accurately obtain monomer voltage, asking for electrokinetic cell safety is influenceed Topic, can make high battery management system framework layout more reasonable.
Brief description of the drawings
, below will be attached to what is used required in embodiment in order to illustrate more clearly of specific embodiment of the utility model Figure is briefly described.
Fig. 1:It is a kind of voltage acquisition system for battery pack configuration diagram that the utility model is provided;
Fig. 2:It is a kind of structural representation for high_voltage isolation module that the utility model is provided.
Embodiment
In order that those skilled in the art more fully understand the scheme of the utility model embodiment, below in conjunction with the accompanying drawings and Embodiment is described in further detail to the utility model embodiment.
For in current battery voltage acquisition, if the communication between acquisition chip disconnects, it is impossible to accurately obtain monomer Voltage.The utility model provides a kind of voltage acquisition system for battery pack framework, and voltage acquisition module uses the first high_voltage isolation mould Block and the second high_voltage isolation module transmit the monomer voltage of battery pack to primary processor respectively.Solve existing batteries monomer voltage When collection communicates disconnection between voltage acquisition chip, it is impossible to accurately obtain monomer voltage, the problem of electrokinetic cell is safe is influenceed, High battery management system framework layout can be made more reasonable.
As shown in figure 1, a kind of voltage acquisition system for battery pack framework, the battery pack is by one or more battery module string Joint group is into the battery modules are made up of multiple cells, and each described battery modules is adopted by the voltage connected one to one Collect module and carry out voltage acquisition, including:First high_voltage isolation module, the second high_voltage isolation module and primary processor.Described in each Voltage acquisition module is according to passing through I2C buses are sequentially connected according to chrysanthemum chain pattern head and the tail, the voltage acquisition module positioned at end Pass through I2C buses are connected with the input of the first high_voltage isolation module, and the voltage acquisition module positioned at head end is total by I2C Line is connected with the input of the second high_voltage isolation module.The first input end of the primary processor and first high pressure every Output end from module is connected, the second input of the primary processor and the output end phase of the second high_voltage isolation module Even.The primary processor obtains each cell by the first high_voltage isolation module and the second high_voltage isolation module Voltage.
Specifically, primary processor obtains the voltage of each cell by two-way high_voltage isolation module, if wherein two When communication connection between individual voltage acquisition module disconnects, primary processor can obtain phase respectively from the voltage acquisition module of head and end Close the voltage of cell.If the communication connection between voltage acquisition module is not turned off, the signal of whole order circuit is just Can be from battery modules m to battery modules m-1 until the voltage acquisition module of Section 1 battery modules passes through the first high_voltage isolation mould Block is sent to primary processor.
Further, the voltage acquisition module includes:AD AD conversion units, Acquisition Circuit, acquisition chip.The collection The output end of circuit is connected with the input of the AD AD conversion units, the input of the acquisition chip and the AD moduluses The output end of converting unit is connected.The Acquisition Circuit is used to carry out monomer voltage to each cell of the battery modules Collection, and each monomer voltage is sent to the AD AD conversion units.
The acquisition chip includes I2C serial ports, the corresponding acquisition chip of each described battery modules passes through the I2C serial ports It is connected.
The voltage acquisition module also includes:Voltage balancing module;The voltage balancing module is serially connected in cell Two ends, when battery pack is charged, if the voltage of the cell in the battery modules is inconsistent, the acquisition chip The voltage balancing module is controlled to consume the power of the cell, so that the monomer voltage in battery modules is consistent.
Further, the voltage balancing module includes:Discharge resistance and switch element;The discharge resistance and the switch Element is serially connected in the two ends of cell, and the control end of the switch element is connected with the output end of the acquisition chip, in electricity During the group charging of pond, the acquisition chip carries out power to corresponding cell according to the monomer voltage controlling switch element and disappeared Consumption.
In actual applications, the first high_voltage isolation module and the second high_voltage isolation module are high_voltage isolation core Piece.As shown in Fig. 2 the clock signal clk and data-signal SDA that are exported by acquisition chip are separately input into high_voltage isolation chip Pin SCL2 and pin SDA2, carries out high_voltage isolation output, the pin SCL1 and pin SDA1 of high_voltage isolation chip are exported respectively The clock signal corresponding with clock signal and data-signal is to primary processor.
The primary processor includes:Numbering acquiring unit and reading control unit.The numbering acquiring unit is used to receive The battery modules numbering that each described acquisition chip is sent.The reading control unit judges whether all to obtain according to the numbering The corresponding numbering of each battery modules in battery pack is obtained, in this way, then the reading control unit is high by described first Pressure isolation module obtains the voltage of each cell, otherwise, the reading control unit simultaneously by first high pressure every From the voltage that module and second isolation module obtain each cell.
Specifically, primary processor obtains monomer voltage information and 1 can from top to bottom obtained from battery modules m to battery modules Take, can also from bottom to top be obtained from battery modules 1 to battery modules m.Meanwhile, if logical between two battery modules wherein After news open circuit, the voltage of corresponding cell can be still obtained from the battery modules of head and end, whole list has been effectively ensured The security and reliability of bulk voltage collection.
It can be seen that, the utility model provides a kind of voltage acquisition system for battery pack framework, and voltage acquisition module is high using first Isolation module and the second high_voltage isolation module is pressed to transmit the monomer voltage of battery pack to primary processor respectively.Solve existing battery pack When monomer voltage collection communicates disconnection between voltage acquisition chip, it is impossible to accurately obtain monomer voltage, influence electrokinetic cell peace Full the problem of, high battery management system framework layout can be made more reasonable.
Construction of the present utility model, feature and action effect is described in detail according to diagrammatically shown embodiment above, with Upper described is only preferred embodiment of the present utility model, but the utility model is not to limit practical range shown in drawing, it is every according to According to the made change of conception of the present utility model, or the equivalent embodiment of equivalent variations is revised as, still without departing from specification and figure , all should be in protection domain of the present utility model when showing covered spirit.

Claims (7)

1. a kind of voltage acquisition system for battery pack framework, the battery pack is composed in series by one or more battery module, described Battery modules are made up of multiple cells, and each described battery modules carries out electricity by the voltage acquisition module connected one to one Pressure collection, it is characterised in that including:First high_voltage isolation module, the second high_voltage isolation module and primary processor;
Each described voltage acquisition module is according to passing through I2C buses are sequentially connected according to chrysanthemum chain pattern head and the tail, the electricity positioned at end Pressure acquisition module passes through I2C buses are connected with the input of the first high_voltage isolation module, positioned at the voltage acquisition mould of head end Block passes through I2C buses are connected with the input of the second high_voltage isolation module;
The first input end of the primary processor is connected with the output end of the first high_voltage isolation module, the primary processor Second input is connected with the output end of the second high_voltage isolation module;
The primary processor obtains each monomer electricity by the first high_voltage isolation module and the second high_voltage isolation module The voltage in pond.
2. framework according to claim 1, it is characterised in that the voltage acquisition module includes:AD AD conversion units, Acquisition Circuit, acquisition chip;
The output end of the Acquisition Circuit is connected with the input of the AD AD conversion units, the input of the acquisition chip It is connected with the output end of the AD AD conversion units;
The Acquisition Circuit is used to carry out each cells of the battery modules monomer voltage collection, and by each monomer Voltage is sent to the AD AD conversion units.
3. framework according to claim 2, it is characterised in that the acquisition chip includes I2C serial ports, each described battery The corresponding acquisition chip of module passes through the I2C serial ports is connected.
4. framework according to claim 3, it is characterised in that the voltage acquisition module also includes:Voltage balancing module;
The voltage balancing module is serially connected in the two ends of cell, when battery pack is charged, if the battery modules The voltage of interior cell is inconsistent, and the acquisition chip controls the work(of the voltage balancing module consumption cell Rate, so that the monomer voltage in battery modules is consistent.
5. framework according to claim 4, it is characterised in that the voltage balancing module includes:Discharge resistance and switch Element;
The discharge resistance and the switch element are serially connected in the two ends of cell, the control end of the switch element with it is described The output end of acquisition chip is connected, and when battery pack charges, the acquisition chip is according to the monomer voltage controlling switch element Power consumption is carried out to corresponding cell.
6. framework according to claim 5, it is characterised in that the first high_voltage isolation module and second high pressure every It is high_voltage isolation chip from module.
7. framework according to claim 6, it is characterised in that the primary processor includes:Numbering acquiring unit and reading Control unit;
The numbering acquiring unit is used to receive the battery modules numbering that each described acquisition chip is sent;
The control unit that reads judges whether that each battery modules in all acquisition battery packs are corresponding according to the numbering The numbering, it is in this way, then described to read the electricity that control unit obtains each cell by the first high_voltage isolation module Pressure, otherwise, the reading control unit are obtained by the first high_voltage isolation module and the second high_voltage isolation module simultaneously Take the voltage of each cell.
CN201720249879.2U 2017-03-15 2017-03-15 A kind of voltage acquisition system for battery pack framework Expired - Fee Related CN206540956U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108802473A (en) * 2018-03-05 2018-11-13 博科能源系统(深圳)有限公司 Battery pack cascade voltage acquisition system and more battery pack cascade voltage acquisition systems
CN109507607A (en) * 2018-10-29 2019-03-22 国家电网有限公司 Portable storage battery group voltage acquisition instrument
CN110661305A (en) * 2018-06-28 2020-01-07 宁德时代新能源科技股份有限公司 Battery pack management system and control method thereof
CN110967648A (en) * 2019-02-26 2020-04-07 宁德时代新能源科技股份有限公司 Sampling circuit and control method thereof
CN111725574A (en) * 2019-03-20 2020-09-29 立锜科技股份有限公司 Battery system, battery module and battery control circuit therein

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108802473A (en) * 2018-03-05 2018-11-13 博科能源系统(深圳)有限公司 Battery pack cascade voltage acquisition system and more battery pack cascade voltage acquisition systems
CN110661305A (en) * 2018-06-28 2020-01-07 宁德时代新能源科技股份有限公司 Battery pack management system and control method thereof
US11031789B2 (en) 2018-06-28 2021-06-08 Contemporary Amperex Technology Co., Limited Battery pack management system and control method thereof
CN109507607A (en) * 2018-10-29 2019-03-22 国家电网有限公司 Portable storage battery group voltage acquisition instrument
CN110967648A (en) * 2019-02-26 2020-04-07 宁德时代新能源科技股份有限公司 Sampling circuit and control method thereof
CN111725574A (en) * 2019-03-20 2020-09-29 立锜科技股份有限公司 Battery system, battery module and battery control circuit therein

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Granted publication date: 20171003

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