CN110995558A - Battery management system compatible with CAN and daisy chain connection - Google Patents
Battery management system compatible with CAN and daisy chain connection Download PDFInfo
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- CN110995558A CN110995558A CN201911011254.2A CN201911011254A CN110995558A CN 110995558 A CN110995558 A CN 110995558A CN 201911011254 A CN201911011254 A CN 201911011254A CN 110995558 A CN110995558 A CN 110995558A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/42—Loop networks
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40215—Controller Area Network CAN
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
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- General Physics & Mathematics (AREA)
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
Abstract
The invention aims to provide a battery management system compatible with CAN and daisy chain connection.A MCU module is connected with an SPI conversion chip, the SPI conversion chip is connected with a first battery measuring unit through a UART _ SPI, and the first battery measuring unit is connected with a second battery measuring unit; when the CAN carries OUT external communication, the UART _ OUT1 interface and the UART _ OUT2 interface of the two battery measuring units adopt a pin short-circuit mode, 4 AFEs of the first battery measuring unit form a 'ring', and data of the 4 AFEs are transmitted to the MCU through the UART _ SPI for processing and then are finally communicated through the CAN; when daisy chain connection communication is adopted, the UART _ OUT1 of the first battery measurement unit is connected with the SPI conversion chip, the UART _ OUT2 of the first battery measurement unit is connected with the UART _ OUT1 of the second battery measurement unit, the UART _ OUT2 of the second battery measurement unit is in short circuit, and the data of 8 AFEs of the two units are transmitted to the MCU for processing; the CAN and daisy chain are compatible for external communication and CAN be switched according to different requirements.
Description
Technical Field
The invention relates to the field of battery management systems, in particular to a battery management system compatible with CAN and daisy chain connection.
Background
In the prior art, the traditional CAN and external communication have been subjected to market verification for decades, and the reliability is widely accepted. And, as technology innovations, daisy-chaining and external communication applications in the BMS have been gradually developed in recent years. Compared with the CAN and external communication mode, the daisy chain and external communication has the advantages of lower cost and higher transmission speed. However, the general battery management system communicates with the outside only through the CAN or only through the daisy chain, so that different communication modes are required to be designed for different project requirements, resulting in reduction of development efficiency and increase of design cost.
Disclosure of Invention
In order to solve the problems, the invention provides a battery management system compatible with CAN and daisy chain connection.A MCU module is connected with an SPI conversion chip, the SPI conversion chip is connected with a first battery measurement unit through a UART _ SPI, and the first battery measurement unit is connected with a second battery measurement unit; when the CAN carries OUT external communication, the UART _ OUT1 interfaces and the UART _ OUT2 interfaces of the two battery measuring units adopt a pin short-circuit mode; 4 AFEs of the first battery measurement unit form a 'ring', and data of the 4 AFEs are transmitted to the MCU through the UART _ SPI for processing and then are finally communicated through the CAN; when daisy chain connection communication is adopted, the UART _ OUT1 of the first battery measuring unit is connected with the SPI conversion chip, the UART _ OUT2 of the first battery measuring unit is connected with the UART _ OUT1 of the second battery measuring unit, and the UART _ OUT2 of the second battery measuring unit is in short circuit, so that two units are connected in series to form a 'ring', and data of 8 AFEs of the two units are transmitted to the MCU for processing through the UART _ OUT1 of the first battery measuring unit; the first battery measuring unit is communicated with the MCU and the second battery measuring unit through UART communication respectively; therefore, the communication between the CAN and the daisy chain is compatible with the external communication, and the conversion CAN be carried out according to different requirements, thereby solving the problems in the background technology.
The invention aims to provide a battery management system compatible with CAN and daisy chain connection, which comprises an MCU module, wherein the MCU module is connected with an SPI conversion chip, the SPI conversion chip converts SPI into UART _ SPI daisy chain communication, and the SPI conversion chip is connected with a first battery measurement unit through the UART _ SPI; the first battery measuring unit is connected with a second battery measuring unit; the MCU module is also connected with a CAN module and an LDO module; the two ends of each of the two battery measuring units are respectively connected with a UART _ OUT1 interface and a UART _ OUT2 interface, and the UART _ OUT1 interface of the first battery measuring unit is connected with the SPI conversion chip; four AFE battery front end acquisition chips connected in series through a UART interface form a battery measurement unit, and each AFE battery front end acquisition chip is connected with a battery.
The further improvement lies in that: the AFE battery front-end acquisition chip comprises three modules of voltage acquisition, passive equalization and temperature detection; the model of the AFE chip is LTC6811 or Maxim17823 or NXP 33771.
The further improvement lies in that: when CAN communication is adopted, the UART _ OUT1 interface and the UART _ OUT2 interface of the two battery measurement units adopt a pin short circuit mode; 4 AFEs of the first battery measurement unit form a 'ring', and data of the 4 AFEs are transmitted to the MCU through the UART _ SPI for processing and then are finally communicated through the CAN.
The further improvement lies in that: when daisy chain connection communication is adopted, the UART _ OUT1 of the first battery measuring unit is connected with the SPI conversion chip, the UART _ OUT2 of the first battery measuring unit is connected with the UART _ OUT1 of the second battery measuring unit, and the UART _ OUT2 of the second battery measuring unit is in short circuit, so that the two units are cascaded into a 'ring', and data of 8 AFEs of the two units are transmitted to the MCU for processing through the UART _ OUT1 of the first battery measuring unit; the first battery measuring unit is communicated with the MCU and the second battery measuring unit through UART communication respectively.
The invention has the beneficial effects that: the MCU module is connected with an SPI conversion chip, the SPI conversion chip is connected with a first battery measuring unit through a UART _ SPI, and the first battery measuring unit is connected with a second battery measuring unit; when the CAN carries OUT external communication, the UART _ OUT1 interfaces and the UART _ OUT2 interfaces of the two battery measuring units adopt a pin short-circuit mode; 4 AFEs of the first battery measurement unit form a 'ring', and data of the 4 AFEs are transmitted to the MCU through the UART _ SPI for processing and then are finally communicated through the CAN; when daisy chain connection communication is adopted, the UART _ OUT1 of the first battery measuring unit is connected with the SPI conversion chip, the UART _ OUT2 of the first battery measuring unit is connected with the UART _ OUT1 of the second battery measuring unit, and the UART _ OUT2 of the second battery measuring unit is in short circuit, so that two units are connected in series to form a 'ring', and data of 8 AFEs of the two units are transmitted to the MCU for processing through the UART _ OUT1 of the first battery measuring unit; the first battery measuring unit is communicated with the MCU and the second battery measuring unit through UART communication respectively; thus, the CAN and the daisy chain are compatible with the external communication and CAN be changed according to different requirements.
The CAN communication mode is selected, and under the condition that a plurality of battery measuring units are used simultaneously, each measuring unit needs to be provided with a corresponding MCU and a corresponding CAN module independently.
With the daisy chain communication mode, only one MCU and CAN transceiver CAN be used.
Therefore, in practical application, the method can be flexibly selected and matched according to the actual requirements of projects, and the development can be carried out under a unified platform, so that the development efficiency is obviously improved, and the development and production costs are reduced.
Drawings
FIG. 1 is a system block diagram of the present invention.
Fig. 2 is a system block diagram in CAN communication according to the present invention.
Fig. 3 is a system block diagram of the daisy chain communication of the present invention.
Detailed Description
For the purpose of enhancing understanding of the present invention, the present invention will be further described in detail with reference to the following examples, which are provided for illustration only and are not to be construed as limiting the scope of the present invention.
As shown in fig. 1-3, the present embodiment provides a battery management system compatible with CAN and daisy chain connection, including an MCU module, where the MCU module is connected with an SPI conversion chip, the SPI conversion chip converts SPI into UART _ SPI daisy chain communication, and the SPI conversion chip is connected with a first battery measurement unit through UART _ SPI; the first battery measuring unit is connected with a second battery measuring unit; the MCU module is also connected with a CAN module and an LDO module; the two ends of each of the two battery measuring units are respectively connected with a UART _ OUT1 interface and a UART _ OUT2 interface, and the UART _ OUT1 interface of the first battery measuring unit is connected with the SPI conversion chip; four AFE battery front end acquisition chips connected in series through a UART interface form a battery measurement unit, and each AFE battery front end acquisition chip is connected with a battery. The AFE battery front-end acquisition chip comprises three modules of voltage acquisition, passive equalization and temperature detection.
When CAN communication is adopted, the UART _ OUT1 interface and the UART _ OUT2 interface of the two battery measurement units adopt a pin short circuit mode; 4 AFEs of the first battery measurement unit form a 'ring', and data of the 4 AFEs are transmitted to the MCU through the UART _ SPI for processing and then are finally communicated through the CAN; and one battery measuring unit is independently transmitted to the MCU for communication. When daisy chain connection communication is adopted, the UART _ OUT1 of the first battery measuring unit is connected with the SPI conversion chip, the UART _ OUT2 of the first battery measuring unit is connected with the UART _ OUT1 of the second battery measuring unit, and the UART _ OUT2 of the second battery measuring unit is in short circuit, so that the two units are cascaded into a 'ring', and data of 8 AFEs of the two units are transmitted to the MCU for processing through the UART _ OUT1 of the first battery measuring unit; the first battery measuring unit is communicated with the MCU and the second battery measuring unit through UART communication respectively; the two battery measurement units are connected and communicated, and then are transmitted to the MCU together for communication.
The MCU module is connected with an SPI conversion chip, the SPI conversion chip is connected with a first battery measuring unit through a UART _ SPI, and the first battery measuring unit is connected with a second battery measuring unit; when the CAN carries OUT external communication, the UART _ OUT1 interfaces and the UART _ OUT2 interfaces of the two battery measuring units adopt a pin short-circuit mode; 4 AFEs of the first battery measurement unit form a 'ring', and data of the 4 AFEs are transmitted to the MCU through the UART _ SPI for processing and then are finally communicated through the CAN; when daisy chain connection communication is adopted, the UART _ OUT1 of the first battery measuring unit is connected with the SPI conversion chip, the UART _ OUT2 of the first battery measuring unit is connected with the UART _ OUT1 of the second battery measuring unit, and the UART _ OUT2 of the second battery measuring unit is in short circuit, so that two units are connected in series to form a 'ring', and data of 8 AFEs of the two units are transmitted to the MCU for processing through the UART _ OUT1 of the first battery measuring unit; the first battery measuring unit is communicated with the MCU and the second battery measuring unit through UART communication respectively; thus, the CAN and the daisy chain are compatible with the external communication and CAN be changed according to different requirements.
The CAN communication mode is selected, and under the condition that a plurality of battery measuring units are used simultaneously, each measuring unit needs to be provided with a corresponding MCU and a corresponding CAN module independently.
With the daisy chain communication mode, only one MCU and CAN transceiver CAN be used.
Therefore, in practical application, the method can be flexibly selected and matched according to the actual requirements of projects, and the development can be carried out under a unified platform, so that the development efficiency is obviously improved, and the development and production costs are reduced.
Claims (4)
1. A battery management system compatible with CAN and daisy chain connection comprises an MCU module, and is characterized in that: the MCU module is connected with an SPI conversion chip, the SPI conversion chip converts the SPI into UART _ SPI daisy chain communication, and the SPI conversion chip is connected with a first battery measurement unit through the UART _ SPI; the first battery measuring unit is connected with a second battery measuring unit; the MCU module is also connected with a CAN module and an LDO module; the two ends of each of the two battery measuring units are respectively connected with a UART _ OUT1 interface and a UART _ OUT2 interface, and the UART _ OUT1 interface of the first battery measuring unit is connected with the SPI conversion chip; four AFE battery front end acquisition chips connected in series through a UART interface form a battery measurement unit, and each AFE battery front end acquisition chip is connected with a battery.
2. The CAN and daisy chain connection compatible battery management system of claim 1 wherein: the AFE battery front-end acquisition chip comprises three modules of voltage acquisition, passive equalization and temperature detection; the model of the AFE chip is LTC6811 or Maxim17823 or NXP 33771.
3. The CAN and daisy chain connection compatible battery management system of claim 1 wherein: when CAN communication is adopted, the UART _ OUT1 interface and the UART _ OUT2 interface of the two battery measurement units adopt a pin short circuit mode; 4 AFEs of the first battery measurement unit form a 'ring', and data of the 4 AFEs are transmitted to the MCU through the UART _ SPI for processing and then are finally communicated through the CAN; and one battery measuring unit is independently transmitted to the MCU for communication.
4. The CAN and daisy chain connection compatible battery management system of claim 1 wherein: when daisy chain connection communication is adopted, the UART _ OUT1 of the first battery measuring unit is connected with the SPI conversion chip, the UART _ OUT2 of the first battery measuring unit is connected with the UART _ OUT1 of the second battery measuring unit, and the UART _ OUT2 of the second battery measuring unit is in short circuit, so that the two units are cascaded into a 'ring', and data of 8 AFEs of the two units are transmitted to the MCU for processing through the UART _ OUT1 of the first battery measuring unit; the first battery measuring unit is communicated with the MCU and the second battery measuring unit through UART communication respectively; the two battery measurement units are connected and communicated, and then are transmitted to the MCU together for communication.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911011254.2A CN110995558A (en) | 2019-10-23 | 2019-10-23 | Battery management system compatible with CAN and daisy chain connection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911011254.2A CN110995558A (en) | 2019-10-23 | 2019-10-23 | Battery management system compatible with CAN and daisy chain connection |
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| CN110995558A true CN110995558A (en) | 2020-04-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111775769A (en) * | 2020-06-28 | 2020-10-16 | 联合汽车电子有限公司 | Battery management system and method |
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| US20190280903A1 (en) * | 2018-03-12 | 2019-09-12 | Nxp B.V. | Isolation circuit and method therefor |
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2019
- 2019-10-23 CN CN201911011254.2A patent/CN110995558A/en active Pending
Patent Citations (4)
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| CN106080251A (en) * | 2016-08-05 | 2016-11-09 | 合肥工业大学 | There is the electric automobile power battery management system of complete fault self-diagnosis function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111775769A (en) * | 2020-06-28 | 2020-10-16 | 联合汽车电子有限公司 | Battery management system and method |
| CN111775769B (en) * | 2020-06-28 | 2022-04-08 | 联合汽车电子有限公司 | Battery management system and method |
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