CN214225269U - Wireless current and voltage acquisition system for power storage battery - Google Patents
Wireless current and voltage acquisition system for power storage battery Download PDFInfo
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- CN214225269U CN214225269U CN202022790710.2U CN202022790710U CN214225269U CN 214225269 U CN214225269 U CN 214225269U CN 202022790710 U CN202022790710 U CN 202022790710U CN 214225269 U CN214225269 U CN 214225269U
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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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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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Abstract
The utility model provides a wireless acquisition system for current and voltage of a power storage battery, which comprises a main control module and a high-voltage acquisition unit; the high-voltage acquisition module is further connected with a shunt, the shunt is connected at the negative end of the power storage battery, one end of the shunt is connected with the negative electrode of the power storage battery, the other end of the shunt is connected at the position of the main negative relay, and the high-voltage acquisition unit calculates the current passing through the power storage battery by acquiring the pressure difference at the two ends of the shunt and the resistance value of the shunt. A wireless high-voltage collection system among power battery electric current and the wireless collection system of voltage can carry out nimble arranging according to battery package high pressure position, reduce the design degree of difficulty and practice thrift the space, application integrated form collection module, this module has collection and operation function, reduces peripheral circuit configuration, directly carries out the collection of shunt, voltage, can carry out the output of multiple communication mode, reduces wireless control system's the design degree of difficulty, saves the controller space, practices thrift the controller cost.
Description
Technical Field
The utility model belongs to the technical field of pure electric vehicles, especially, relate to a power battery electric current and wireless collection system of voltage.
Background
The development of automobile electromotion and intellectualization enables the part link to accelerate the conversion from a mechanical system to an electronic system. In the field of battery management systems BMS, with the advancement of weight reduction, reliability, and intelligence in electric vehicles, all automobile manufacturers are also seeking ways to improve the performance and reliability of battery management systems. Wireless BMS are currently an important direction for technology development and application by virtue of their flexibility. The basis of BMS is the understanding of the state of the car battery through the measurement of voltage, current, temperature, and host factories are becoming more and more sensitive to the weight reduction, cost reduction, etc. of power storage batteries, which naturally gives the opportunity for faster commercialization of wireless BMS technologies. The BMS system mainly comprises a battery monomer collection part, a temperature collection part, a current collection part, a power storage battery voltage collection part, a relay control part, an insulation detection part and the like. The whole BMS system consists of a plurality of acquisition units for acquiring the information of the single batteries, a high-voltage acquisition unit for acquiring the information of the battery packs and a main control unit for operation control. The current and voltage of the power storage battery are collected in a wireless mode, and the method is also part of the development of a wireless BMS. The method has important significance for optimizing the internal structure of the power storage battery and reducing the cost of the controller.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention is directed to a wireless current and voltage collection system for power storage batteries, which solves the above-mentioned problems.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
a wireless acquisition system for current and voltage of a power storage battery comprises a main control module and a high-voltage acquisition unit;
the high-voltage acquisition module is also connected with a shunt, the shunt is connected to the negative end of the power storage battery, one end of the shunt is connected with the negative electrode of the power storage battery, the other end of the shunt is connected to the main negative relay, and the high-voltage acquisition unit calculates the current passing through the power storage battery by acquiring the voltage difference between the two ends of the shunt and the resistance value of the shunt;
the high-voltage acquisition unit is also connected with an acquisition wiring harness connector, and the acquisition wiring harness connector is used for acquiring the voltage of the power storage battery, the battery voltage at the rear end of the main positive relay and the battery voltage at the rear end of the main negative relay;
the high-voltage acquisition unit is in wireless communication with the main control module and is used for transmitting acquired voltage and current information.
Furthermore, the high-voltage acquisition unit comprises an acquisition communication module and a wireless transmitting module, and is used for acquiring voltage and current and wirelessly communicating with the main control unit.
Furthermore, the acquisition communication module has a differential AD input function and is used for directly connecting acquisition points at two ends of the shunt to a module differential AD input pin, and the current value of the power storage battery is obtained through internal operation logic.
Furthermore, the wireless transmitting module is used for receiving the data of the integrated communication module through the SPI and transmitting the data to the main control unit through the wireless Bluetooth module.
Furthermore, the wiring harness of the collection wiring harness connector is connected with a positive electrode HV + of the high-voltage power storage battery, a rear end voltage MOT + of the main positive relay, and a rear end MOT-of the main negative relay, and is used for collecting the voltage of the power storage battery, the battery voltage at the rear end of the main positive relay and the battery voltage at the rear end of the main negative relay.
Further, the device also comprises a high-voltage-to-12V DC-DC converter and a high-voltage-to-3.3V DC-DC converter which are connected with the high-voltage power storage battery;
the high-voltage-to-12V DC-DC is used for supplying power to the acquisition communication module, and the 12V-to-3.3V DC-DC is used for supplying power to the wireless transmitting module.
Furthermore, the master control unit is used for receiving the voltage and current information of the high-voltage acquisition unit and comprises a wireless Bluetooth receiving module and a master control MCU (microprogrammed control unit), wherein the wireless Bluetooth receiving module is used for receiving the wireless information of the high-voltage acquisition unit, and the wireless receiving module sends the received voltage and current information to the master control MCU through SPI (serial peripheral interface) communication for logical operation of the battery management system.
Compared with the prior art, a power battery electric current and wireless collection system of voltage have following advantage:
(1) a power battery electric current and wireless collection system of voltage pass through power battery and give the power supply of high pressure collection unit, need not on-vehicle 12V power supply, adopt non-contact wireless transmission's mode to give the main control unit with the electric current of power battery, battery voltage (including battery package voltage, relay back end voltage), the main control unit carries out real time monitoring to the battery package state, wireless communication fault rate is low, arranges in a flexible way, simple structure, the cost is lower.
(2) A wireless high-voltage acquisition system among power battery electric current and the wireless acquisition system of voltage can carry out nimble arranging according to battery package high-pressure position, reduce the design degree of difficulty and practice thrift the space. The integrated acquisition module has acquisition and operation functions, reduces the configuration of peripheral circuits, directly acquires shunt and voltage, has SPI, LIN and CAN communication interfaces, CAN output various communication modes, reduces the design difficulty of a wireless control system, saves the space of a controller and saves the cost of the controller.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
fig. 1 is an overall layout diagram of a voltage and current acquisition monitoring system of a wireless power storage battery according to an embodiment of the present invention;
fig. 2 is an internal schematic diagram of a voltage and current collecting and monitoring system for a wireless power storage battery according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a receiving end of a wireless power storage battery voltage and current collection monitoring system according to an embodiment of the present invention.
Description of reference numerals:
1-negative terminal of high-voltage power accumulator; 2-a high-voltage power storage battery; 3-positive terminal of high-voltage power accumulator; 4-main positive relay; 5-output anode MOT +; 6-a main control unit; 7-a wireless high-voltage acquisition unit; 8-a main negative relay; 9-output negative pole MOT-; 10-a flow divider; 11-high voltage to 12V DC-DC; 12-acquisition line interface; converting 13-12V to 3.3V DC-DC; 14-wireless bluetooth transmitting module; 15-a transmitting antenna; 16-acquisition communication module; 17-a receiving antenna; 18-a wireless bluetooth receiving module; 19-master MCU.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
A wireless acquisition system for current and voltage of a power storage battery comprises a main control module and a high-voltage acquisition unit;
the high-voltage acquisition module is also connected with a shunt, the shunt is connected to the negative end of the power storage battery, one end of the shunt is connected with the negative electrode of the power storage battery, the other end of the shunt is connected to the main negative relay, and the high-voltage acquisition unit calculates the current passing through the power storage battery by acquiring the voltage difference between the two ends of the shunt and the resistance value of the shunt;
the high-voltage acquisition unit is also connected with an acquisition wiring harness connector, and the acquisition wiring harness connector is used for acquiring the voltage of the power storage battery, the battery voltage at the rear end of the main positive relay and the battery voltage at the rear end of the main negative relay;
the high-voltage acquisition unit is in wireless communication with the main control module and is used for transmitting acquired voltage and current information.
The high-voltage acquisition unit comprises an acquisition communication module and a wireless transmitting module and is used for acquiring voltage and current and wirelessly communicating with the main control unit.
The acquisition communication module has a differential AD input function and is used for directly accessing acquisition points at two ends of the shunt into a module differential AD input pin, and the current value of the power storage battery is obtained through internal operation logic.
The wireless transmitting module is used for receiving the data of the integrated communication module through the SPI and transmitting the data to the main control unit through the wireless Bluetooth module.
The wiring harness of the collection wiring harness connector is connected with a positive electrode HV of the high-voltage power storage battery, a rear end voltage MOT of the main positive relay, and a rear end MOT of the main negative relay, and is used for collecting the voltage of the power storage battery, the battery voltage at the rear end of the main positive relay and the battery voltage at the rear end of the main negative relay.
The high-voltage DC-DC converter also comprises a high-voltage DC-DC converter which is connected with the high-voltage power storage battery 2 and converts 12V to 3.3V DC-DC;
the high-voltage-to-12V DC-DC is used for supplying power to the acquisition communication module, and the 12V-to-3.3V DC-DC is used for supplying power to the wireless transmitting module.
The master control unit is used for receiving voltage and current information of the high-voltage acquisition unit and comprises a wireless Bluetooth receiving module and a master control MCU (microprogrammed control unit), wherein the wireless Bluetooth receiving module is used for receiving the wireless information of the high-voltage acquisition unit, and the wireless receiving module transmits the received voltage and current information to the master control MCU through SPI (serial peripheral interface) communication for logical operation of the battery management system.
In the specific implementation process, as shown in fig. 1, the wireless current voltage acquisition system is mainly applied to a high-voltage power storage battery system of a new energy automobile and used for acquiring the voltage and the current of a power storage battery. The negative electrode end HV-1 of the high-voltage power storage battery is connected with a shunt of the high-voltage acquisition unit 7, the other end of the shunt is connected to a main negative relay 8, and the other end of the main negative relay 8 is connected with a battery negative electrode output 9 MOT-.
The main positive relay 4 is connected to the positive terminal 3HV + of the power storage battery 2, and the other end of the main positive relay 4 is connected to the positive output 5MOT +, so that the whole power storage battery loop is formed.
The high-voltage acquisition unit 7 acquires the current of the whole power storage battery through a shunt connected in series in the main negative main circuit, and connects the wire harnesses fixed on HV +, MOT + and MOT-to the high-voltage acquisition unit 7 for acquiring the voltage of the high-voltage storage battery, the rear end voltage of the main positive relay and the rear end voltage of the main negative relay.
The high-voltage acquisition unit sends current and voltage data of the high-voltage power storage battery to the main control unit through the processes of acquisition, data processing, information interaction, wireless communication and the like, and the main control unit controls the response according to the acquired current of the power storage battery and the voltage conditions of all parts. ///
As shown in figure 2, the wireless acquisition core part of the power storage battery is mainly composed of a current divider 10, a 600-12V DC-DC 11, an acquisition line interface 12, a 12-3.3V DC-DC 13, a wireless transmitting module 14, a transmitting antenna 15 and an acquisition and communication module 16.
The current divider 10 in the high voltage acquisition unit has a directional relationship, and the position marked with the negative pole sign needs to be connected with the negative pole of the power storage battery. The end is used as a common negative end of the wireless high-voltage acquisition unit. The shunt 10 is similar to a resistor with a fixed resistance value, when a current flows through the power storage battery, a certain voltage difference is generated at two ends of the shunt, and the collection lines HV-, shunt + at two ends of the shunt are connected to a shunt collection pin of a collection communication module.
The acquisition line interface 12 is the only interface between the wireless high-voltage acquisition unit and the external connection, and the main wiring harnesses are a power storage battery positive electrode terminal HV +, a main positive relay rear end MOT + and a main negative relay rear end MOT-.
The positive electrode end HV + of the power storage battery not only plays a role in collecting voltage, but also plays a role in being applied together with the negative electrode HV-of the power storage battery and a power supply source of the whole wireless high-voltage collection system. The positive and negative poles HV +, HV-of the power storage battery are connected into the 600-12V DC-DC module 11. The module is a non-isolated high-voltage to low-voltage chip with ultra-wide input range, can support 600V direct-current voltage input at most, and can be applied to vehicle power storage batteries with the voltage below 600V.
The module has the characteristics of small standby power, low temperature rise and the like. According to the power supply requirement of the acquisition communication module 16, the power consumption requirement of the whole wireless high-voltage acquisition module is combined, and the power supply voltage is selected to be 12V. The conversion process from high pressure to 12V low pressure is accomplished by module 11.
After the module 11 obtains the power supply required by the acquisition communication module 16, the acquisition communication module acquires and processes corresponding data.
The voltage of the power storage battery 2, the rear end voltage of the main positive relay and the rear end voltage of the main negative relay cannot be directly connected to the acquisition communication module. The AD input range of the acquisition communication chip is 0-5V, so that the voltage of the high-voltage power storage battery needs to be subjected to voltage division treatment.
The acquisition communication module is provided with a plurality of divider resistors, the voltage between HV + and HV-is divided into the acquisition range of the acquisition communication module, and the voltage of the power storage battery is converted by applying the corresponding proportional relation. And sending the data in the acquisition communication module 16 to the wireless transmission module 14 through SPI communication.
The 12-3.3V DC-DC module 13 mainly converts the 12V voltage into 3.3V for supplying power to the wireless transmitting module 14. The 12V voltage output by the module 11 is input into the module 13 and is used as the input of the module 13, the main input parameters are 12V + and 12V-, the 12V voltage input is converted into 3.3V through the module 13, and the 3.3V voltage output is input into the module 14, so that the normal work of the wireless transmitting module is ensured.
The wireless transmitting module 14 adopts an ultra-low power consumption and highly integrated single chip microcomputer device, supports at most 8 simultaneous Bluetooth LE connections, and can be used as a master device, a slave device or any combination. Bluetooth low energy release 5 and general FSK (250kbps, 500kbps and 1000kbps) connections may be supported. The module has an RF radio frequency circuit and an external antenna 15, and has high anti-interference capability. The module operating voltage ranges from 2.1V to 3.6V. The module 13 provides 3.3V voltage for the wireless transmitting module 14, and the SPI communication and the acquisition communication module 16 are adopted for information interaction to obtain the voltage and the current of the power storage battery. The wireless transmitting module adopts the Bluetooth communication technology to send the information of the high-voltage power storage battery to the main control unit 6.
As shown in fig. 3, the part of the main control unit 6 for receiving the high-voltage acquisition information is composed of a receiving antenna 17, a wireless receiving module 18 and a main control MCU 19.
Because the main control unit has a single body acquisition function, relay control and other functions besides receiving high-voltage information, and the main control unit adopts 12V external power supply, only the part designed to receive high-voltage wireless signals is described in fig. 3. The wireless receiving module 18 and the main control MCU module 19 adopt SPI communication to send a wake-up instruction and receive voltage and current information of the high-voltage acquisition module. The wireless receiving module 17 receives the current and voltage information of the high-voltage power storage battery sent by the high-voltage acquisition unit 7, and the wireless receiving module 17 transmits the received information to the master control MCU19 through SPI communication for calculation of the control logic of the battery management system and completion of transmission of the whole high-voltage information.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a power battery current and wireless collection system of voltage which characterized in that: the device comprises a main control module and a high-voltage acquisition unit;
the high-voltage acquisition module is also connected with a shunt (10), the shunt (10) is connected to the negative end of the power storage battery, one end of the shunt (10) is connected with the negative electrode of the power storage battery, the other end of the shunt (10) is connected to a main negative relay (8), and the high-voltage acquisition unit calculates the current passing through the power storage battery by acquiring the pressure difference at the two ends of the shunt (10) and the resistance value of the shunt (10);
the high-voltage acquisition unit is also connected with an acquisition wiring harness connector, and the acquisition wiring harness connector is used for acquiring the voltage of the power storage battery, the battery voltage at the rear end of the main positive relay (4) and the battery voltage at the rear end of the main negative relay (8);
the high-voltage acquisition unit is in wireless communication with the main control module and is used for transmitting acquired voltage and current information.
2. The system for wirelessly collecting current and voltage of a power storage battery according to claim 1, wherein: the high-voltage acquisition unit comprises an acquisition communication module (16) and a wireless transmitting module, and is used for acquiring voltage and current and wirelessly communicating with the main control unit (6).
3. The system for wirelessly collecting current and voltage of a power storage battery according to claim 2, wherein: the acquisition communication module (16) has a differential AD input function and is used for directly connecting acquisition points at two ends of the current divider (10) into a module differential AD input pin, and the current value of the power storage battery is obtained through internal operation logic.
4. The system for wirelessly collecting current and voltage of a power storage battery according to claim 2, wherein: the wireless transmitting module is used for receiving the integrated communication module through the SPI and transmitting data to the main control unit (6) through the wireless Bluetooth module.
5. The system for wirelessly collecting current and voltage of a power storage battery according to claim 1, wherein: the wiring harness of the collection wiring harness connector is connected with a positive electrode HV + of a high-voltage power storage battery (2), a rear end voltage MOT + of a main positive relay (4), a rear end MOT + of a main negative relay (8) and used for collecting the voltage of the power storage battery, the battery voltage at the rear end of the main positive relay (4) and the battery voltage at the rear end of the main negative relay (8).
6. The system for wirelessly collecting current and voltage of a power storage battery according to claim 1, wherein: the high-voltage DC-DC converter also comprises a high-voltage-to-12V DC-DC (11) and a high-voltage-to-3.3V DC-DC (13) which are connected with the high-voltage power storage battery (2);
the high-voltage-to-12V DC-DC (11) is used for supplying power for the acquisition communication module (16), and the 12V-to-3.3V DC-DC (13) is used for supplying power for the wireless transmitting module.
7. The system for wirelessly collecting current and voltage of a power storage battery according to claim 1, wherein: the master control unit (6) is used for receiving voltage and current information of the high-voltage acquisition unit and comprises a wireless Bluetooth receiving module (18) and a master control MCU (19), the wireless Bluetooth receiving module (18) is used for receiving the wireless information of the high-voltage acquisition unit, and the wireless receiving module transmits the received voltage and current information to the master control MCU (19) unit through SPI communication for logical operation of a battery management system.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115436684A (en) * | 2022-07-29 | 2022-12-06 | 中国第一汽车股份有限公司 | Universal static current detection system and method for trial-production sample car and car |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115436684A (en) * | 2022-07-29 | 2022-12-06 | 中国第一汽车股份有限公司 | Universal static current detection system and method for trial-production sample car and car |
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