CN205123346U - Hybrid vehicle carries lithium battery management device - Google Patents

Abstract

The utility model discloses a hybrid vehicle-mounted lithium battery management device, which belongs to the technical field of power supplies and relates to the direction of battery management. The management device includes an STM32 processor, a battery parameter acquisition system, a charging and discharging system, a man-machine interaction interface system, a cooling system and The alarm circuit, the battery parameter acquisition system and the charging and discharging system are connected to the battery pack of the hybrid vehicle lithium battery to detect the state of the battery pack. The input terminal of the STM32 processor is connected to the battery parameter collecting system and the charging and discharging system, and the output of the STM32 processor The terminal is connected to the human-computer interaction interface system, cooling system and alarm circuit. The utility model solves the problem that the lithium battery management system in the prior art has relatively single functions and low degree of human-computer interaction, has the advantages of rich functions and high degree of human-computer interaction, enhances battery balance and estimation of remaining power, and has a high degree of intelligence .

Description

A hybrid vehicle lithium battery management device

technical field

The utility model belongs to the technical field of power supplies and relates to the direction of battery management, in particular to a hybrid vehicle lithium battery management device.

Background technique

With the development of society, the construction of information technology is getting faster and faster. From gasoline-powered cars to hybrid cars, pure electric cars will eventually be adopted. This not only alleviates energy consumption, but also protects the environment; however, under conditions such as heating, overcharging, over-discharging, extrusion, and vibration, lithium batteries may shorten battery life and cause damage, and may also cause fire and explosion events. Safety issues have become a major constraint on the commercialization of pure power and hybrid vehicles; from the use of electric vehicles, it has been found that the life of a single battery is much longer than that of the battery pack in an electric vehicle, and studies have shown that this is because the single battery In an unbalanced state, the charging and discharging process is not balanced, and the repeated charging and discharging process aggravates the unbalanced phenomenon of the single battery, causing the shortening of the life of the single battery and shortening the life of the battery where it is located, thus making the entire battery The life of the system is shortened; this is very important for the management of the lithium battery, which not only affects the service life of the lithium battery, but also affects the performance of the car; currently on the market and some car companies have made many lithium battery management systems, but The function is relatively single, and the degree of human-computer interaction is not high. Some are biased towards the estimation of battery charging and discharging, remaining capacity (SOC); some are biased towards battery equalization, thermal management and performance evaluation, and are relatively weak in lithium battery equalization and performance evaluation, and the battery management system on the market is expensive. The battery is not managed efficiently.

Contents of the invention

According to the deficiencies of the prior art above, the technical problem to be solved by this utility model is to propose a hybrid vehicle lithium battery management device, by setting the battery parameter acquisition system and optimizing the human-computer interaction interface system, it solves the problems of the lithium battery in the prior art. The function of the management system is relatively single, and the degree of human-computer interaction is not high. It has the advantages of rich functions and high degree of human-computer interaction. It enhances battery balance and estimation of remaining power, and has a high degree of intelligence.

In order to solve the above technical problems, the technical solution adopted by the utility model is: a hybrid vehicle lithium battery management device, the hybrid vehicle lithium battery management device includes an STM32 processor, a battery parameter acquisition system, a charging and discharging system, a man-machine The interactive interface system, heat dissipation system and alarm circuit, the battery parameter acquisition system and the charge and discharge system are connected to the battery pack of the hybrid vehicle lithium battery to detect the state of the battery pack, and the input terminal of the STM32 processor is connected to the battery parameter acquisition system and the charge and discharge system. system, the output of the STM32 processor is connected to the human-computer interaction interface system, cooling system and alarm circuit.

In the above device, the battery parameter collection system includes a battery monitoring module, the battery monitoring module includes 8 power detection sub-modules, and the power detection sub-modules are simultaneously connected with 8 monomer groups provided in the battery pack, each monomer The group includes 6 monomers, and each monomer group is connected to a power detection sub-module, which is connected to the STM32 processor and controls the work of the power detection sub-module. The battery monitoring module uses a battery management chip AD7280, and the power detection sub-module uses a battery fuel gauge chip DS2788. The battery monitoring module includes a plurality of equalizing charging circuits composed of resistors and MOS tubes. The 8 power detection sub-modules in the battery monitoring module are connected through a daisy chain, and 48 cells are connected and detected at the same time to collect voltage and temperature information data of the cells. The charging and discharging system includes a bidirectional DC-DC module, a first current detection module, a second current detection module and a relay switching module, the first current detection module is connected to the battery pack, and the first current detection module is connected to the STM32 processor and sends The detected battery pack data is sent to the STM32 processor, the relay switching module is connected to the first current detection module, the second current detection module and the STM32 processor, and the STM32 processor is connected to the bidirectional DC-DC module and the second current detection module. The human-computer interaction interface system includes a vehicle controller, a CAN bus module and a vehicle display, the STM32 processor is connected to the CAN bus module, the CAN bus module is connected to the vehicle controller, and the vehicle controller is connected to the vehicle display. The heat dissipation system includes a multipoint temperature detection module and a heat dissipation circuit. The multipoint temperature detection module is connected to the battery pack and collects the temperature information of the battery pack. The STM32 processor is connected to the multipoint temperature detection module and receives the detection of the multipoint temperature detection module. information, the multi-point temperature detection module is connected to the heat dissipation circuit. The hybrid vehicle lithium battery management device also includes a remote control terminal connected to the human-computer interaction interface system. The remote control terminal includes a WIFI wireless module, a wireless router, a central server, a control terminal and a smart phone, the human-computer interaction interface system is connected to the WIFI wireless module and transmits data information through the WIFI wireless module, and the wireless router is connected to the WIFI wireless module and receives data information , the wireless router is connected to the central server, the central server is connected to the control terminal and transmits the information to the control terminal, and the control terminal transmits the fault information to the smart phone through the network.

The beneficial effects of the utility model are: the utility model aims to provide a management device for a hybrid vehicle-mounted lithium battery, which is mainly used for lithium battery management of a current hybrid vehicle and a pure power vehicle, and can display the status of the battery in real time through a vehicle-mounted display Various parameters and circuit parameters, as well as an alarm device can give timely warning of faults, improve the safety of lithium battery charging and discharging and use, improve the service life and efficiency of the battery, and have low cost, which has a good market prospect.

The lithium battery management system invented by the utility model can collect the signal of the battery when charging and discharging up to 48 battery cells at the same time, and also has the detection of the remaining power (SOC) and the detection of overvoltage, undervoltage, and overvoltage. It can also display various parameters on the man-machine interface, and the human can set the early warning value of various parameters of the battery through the interface.

Description of drawings

The following is a brief description of the content expressed in the drawings of this specification and the marks in the drawings:

Fig. 1 is a functional block diagram of a hybrid vehicle lithium battery management device according to a specific embodiment of the present invention.

Fig. 2 is a structural block diagram of a battery parameter acquisition system according to a specific embodiment of the present invention.

Fig. 3 is a schematic circuit diagram of the remaining power collection of the specific embodiment of the present invention.

Fig. 4 is a schematic diagram of a circuit for collecting battery information in the battery monitoring module according to a specific embodiment of the present invention.

Fig. 5 is a functional block diagram of the charging and discharging system of the specific embodiment of the present invention.

Fig. 6 is a schematic circuit diagram of a bidirectional DC-DC module according to a specific embodiment of the present invention.

Fig. 7 is a functional block diagram of a remote control terminal according to a specific embodiment of the present invention.

Specific implementation plan:

In the following, by referring to the accompanying drawings of the description, through the description of the embodiments, the specific implementation of the present utility model, such as the shape and structure of each component involved, the mutual position and connection relationship between each part, the function and working principle of each part, The manufacturing process, operation and use method, etc. are further described in detail to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present utility model.

A hybrid vehicle lithium battery management device, its functional block diagram is shown in Figure 1, the device includes a STM32 processor, battery parameter acquisition system, charging and discharging system, human-computer interaction interface system, heat dissipation system and alarm circuit, battery parameter acquisition system It is connected with the charging and discharging system to the battery pack of the hybrid vehicle lithium battery to detect the state of the battery pack. The input end of the STM32 processor is connected to the battery parameter acquisition system and the charging and discharging system, and the output end of the STM32 processor is connected to the human-computer interaction interface system. , cooling system and alarm circuit. In the management device, the battery parameter acquisition system collects the information of the battery pack, charges and discharges the battery pack through the charging and discharging system, and transmits the information to the man-machine interaction interface system for display through the CAN bus module of the man-machine interface system, and the cooling system is connected to The battery pack detects the temperature of the battery pack and drives the heat dissipation circuit to cool down according to the STM32 processor. The alarm circuit is used to warn of overvoltage, undervoltage, overtemperature, overcurrent and other phenomena. STM32 processors are all processors with STM32 single-chip microcomputer as the core. For the convenience of narration, they are distinguished. STM32 single-chip microcomputer is a 32-bit single-chip microcomputer with low cost and wide application, and its function is powerful and cost-effective; The control core of the battery management system is used to drive and control the modules connected to it.

The structural block diagram of the battery parameter acquisition system is shown in Figure 2. The battery parameter acquisition system includes a battery monitoring module. The battery monitoring module includes 8 power detection sub-modules. Each monomer group includes 6 monomers, and each monomer group is connected with a power detection sub-module. The power detection sub-module is connected to the STM32 processor and controls the work of the power detection sub-module. The 8 power detection sub-modules of the battery monitoring module are connected through a daisy chain, and a total of 48 monomers can be detected at the same time, and each sub-module is connected to the monomers to collect the voltage and temperature information of the monomers. Balanced charging of batteries. The battery monitoring module uses the battery management chip AD7280, and the power detection sub-module uses the battery fuel gauge chip DS2788. The battery monitoring module includes multiple equalizing charging circuits composed of resistors and MOS tubes.

The circuit diagram of the battery monitoring module is shown in Figure 3 and Figure 4. The power detection sub-module uses DS2788 as the main chip for collecting the remaining power, as shown in Figure 3. The entire circuit is powered by PK+ and PK-, and the positive and negative poles are connected to the The two ends of the battery are connected, and the STM32 processor reads data from the DATA port through a single bus. First, you need to completely discharge a fully charged battery through the DS2788 host computer provided by the manufacturer to record the total power of the single battery, and then use the STM32 processor to read the remaining power through the single bus.

As shown in Figure 4, the schematic diagram of collecting battery information in the battery monitoring module. The battery monitoring module uses the power management chip AD728 as the main chip, and a lithium battery can be placed between each adjacent pin of VIN0 to VIN6. R37, R43, R41, and Q11 constitute its equalizing charging circuit, and control the on-off of the gate of the MOS transistor Q11 through the CB1 pin to control the equalizing charging of the battery. As mentioned above, there are multiple equalization circuits in the battery monitoring module. CB2 to CB6 are also controlled in the same way. The latter circuits are all superimposed on the basis of the first level. There are six battery interfaces in total; R4, R6, The six thermistors R8, R10, R11, and R13 are respectively placed on six single batteries, and the resistance of the thermistor changes through the temperature change on the battery. AD7280 causes the pin The voltage is different to calculate the temperature, and the temperature information of the monomer is collected. Further, in fact, it is necessary to use 8 similar circuits for cascading, and through the pins of ALERTHI, SDIHI, /CNVSTHI, SDOHI, SCLKHI, /CSHI, /PDHI, they are respectively connected to the ALERT, SDI, /CNVST, The SDO, SCLK, /CS, and /PD pins are connected to form a daisy chain, and the microcontroller writes commands and reads data to the AD7280 battery detection system through the daisy chain.

As shown in Figure 5, the charging and discharging system includes a bidirectional DC-DC module, a first current detection module, a second current detection module and a relay switching module, the first current detection module is connected to the battery pack to detect the state of the battery pack, the first The current detection module is connected to the STM32 processor and sends the detected battery pack data to the STM32 processor, the relay switching module is connected to the first current detection module, the second current detection module and the STM32 processor, and the STM32 processor is connected to the bidirectional DC-DC module and The second current detection module. When the battery is charging, the relay switching module is connected to the power supply. The relay switching module is controlled by the STM32 processor to switch to the charging mode, and then the current information is transmitted back to the STM32 processor through the second current detection module, and then the electric energy is transmitted through the bidirectional DC-DC module. Through the first current detection module, it is sent to the battery pack for charging; when the battery is discharged, the battery pack passes through the first current detection module, and then connects with the relay switching module. The current detection modules are connected to transmit electric energy to the load to realize the management of charging and discharging of lithium batteries. The structure of the first current detection module is similar to that of the second current detection module. It uses a manganese-copper shunt. When the current passes through the manganese-copper shunt, the voltage is measured. Through I=U/R, the input and output current can be obtained, and the measured voltage can be used AD acquisition of STM32.

As shown in Figure 6, the bidirectional DC-DC module uses the switching power supply management chip TL494 as the main chip, and the voltage and current can be controlled through the two comparators of TL494; U4 is mainly used as the main chip for charging, forming a BUCK step-down The chopper circuit feeds back the voltage between R20 and R17 to pin 1 of TL494, and then inputs a given voltage to pin 2 of TL494 through the STM32 processor DA, and then the PWM wave generated by TL494 drives Q5, Q6, Three N-MOSFETs connected in parallel in Q7 realize step-down, and then the voltage can be stabilized at a constant value through comparison, and the charging voltage can be adjusted by changing the input DA value; through the switching of the relay U3, the three voltages of R27, R28, and R29 can be adjusted. The voltage on two parallel constantan wire resistors is fed back to pin 1 of TL494, and then a voltage is input to pin 2 of TL494 through the microcontroller DA, and the voltages of these two pins are compared, and then the PWM wave generated by TL494 drives Q5 and Q6 , Q7 three N-MOSFETs in parallel can adjust the output to reach a constant current value by changing the input DA value.

U1 is mainly used as the main chip for discharge, which constitutes a Boost chopper circuit; the voltage of R1 and R3 is fed back to the 16th pin of TL494, and a voltage is given to DA2 through the single-chip microcomputer, and the 15th and 16th pins of TL494 are compared. , and then the PWM wave generated by TL494 drives the three parallel N-MOSFETs of Q1, Q2, and Q3 to realize the boost voltage, and the output voltage can be adjusted by adjusting the voltage value of DA2; the three parallel constantan of R27, R28, and R29 can be connected The voltage on the wire resistor is fed back to pin 1 of TL494, and then the input voltage of DA1 is adjusted to pin 2 of TL494. Through comparison, the output current can be limited within a certain range, which acts as a current limiter.

The human-computer interaction interface system includes the vehicle controller, CAN bus module and vehicle display, the STM32 processor is connected to the CAN bus module, the CAN bus module is connected to the vehicle controller, the vehicle controller is connected to the vehicle display, and the STM32 processor transmits information through CAN The bus module sends back to the vehicle controller, and the vehicle controller is connected to the vehicle display to display the information through the vehicle display. A remote control terminal is also installed in the hybrid vehicle lithium battery management device, and the remote control terminal is connected to the human-computer interaction interface system, as shown in Figure 7, the remote control terminal includes a WIFI wireless module, a wireless router, a central server, a control terminal and a smart phone , the human-computer interaction interface system is connected to the WIFI wireless module and transmits data information through the WIFI wireless module, the wireless router is connected to the WIFI wireless module and receives data information, the wireless router is connected to the central server, the central server is connected to the control terminal and transmits the information to the control terminal, Usually, the Internet is used to transmit information to the control terminal, and the control terminal transmits the fault information to the smart phone through the network to notify the management personnel to realize unmanned management.

The heat dissipation system includes a multi-point temperature detection module and a heat dissipation circuit. The multi-point temperature detection module is connected to the battery pack and collects the temperature information of the battery pack. The STM32 processor is connected to the multi-point temperature detection module and receives the detection information of the multi-point temperature detection module. The multi-point temperature detection module is connected with the cooling circuit. The heat dissipation system collects the temperature information of the battery pack through the multi-point temperature detection module, and sends the information back to the STM32 processor for processing. The STM32 processor is connected with a heat dissipation circuit and an alarm circuit, and the heat dissipation circuit is driven by the STM32 processor. The alarm circuit is used for early warning of over-voltage, under-voltage, over-temperature, over-current and other phenomena, and sends out an alarm signal after receiving the alarm command from the processor. The main function of the utility model is to display data information such as the circuit working mode, the voltage and temperature of the monomer, the voltage and temperature of the battery pack, the total charge and discharge current, and the remaining power of the monomer group on the vehicle through the human-computer interaction interface system. On the display screen, real-time monitoring is carried out, and it can be operated manually to realize friendly human-computer interaction; and faults such as overvoltage, overcurrent, undervoltage and overtemperature are displayed, and the above faults are alarmed through the alarm circuit. Realize the intelligence of the battery management system.

The specific working process of the utility model is as follows: the hybrid vehicle lithium battery mainly has a battery power supply state and a battery charging state. When it is in the charging state, the power supply is switched to the charging mode through the relay switching circuit, and is processed by the second current detection module through STM32. The device collects the output current of the power supply, controls the bidirectional DC-DC module through the STM32 processor, and outputs a given current. Through the first current detection module, the collected output current is fed back to the single-chip microcomputer for PID adjustment, so that the output current is constant, and the output voltage is adjusted according to the battery The limit value is limited, and the battery monitoring module is used to balance the lithium battery cells through the STM32 processor to achieve balanced charging; when it is in the discharge state, the battery pack is connected to the first current detection module, and the relay switching circuit is switched Go to the discharge mode, then connect to the bidirectional DC-DC module, control the bidirectional DC-DC module through the STM32 processor, keep the output voltage constant, limit the current, and pass the output current back to the STM32 for processing through the second current detection module switch, and then switch to the load through the relay switching circuit to supply power to the load. The battery monitoring module collects the voltage and temperature of the cell, the power detection sub-module detects the remaining power of the cell group, the multi-point temperature detection module collects the temperature of the battery pack, and sends the information back to the STM32 processor for processing. If it is too high, the cooling circuit will be driven to dissipate heat. If there are faults such as overcurrent, overvoltage, undercurrent, undervoltage, and overtemperature, the STM32 processor will drive the alarm circuit to realize early warning of the fault. The STM32 processor then transmits the information back to the vehicle sensor through the CAN bus module, and the vehicle processor is connected to the vehicle display to display the information on the vehicle display to realize human-computer interaction that is friendly to manual operations.

The utility model has been exemplarily described above in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited by the above-mentioned methods, as long as various insubstantial improvements are made by adopting the method concept and technical solutions of the utility model, or Directly applying the ideas and technical solutions of the utility model to other occasions without improvement is within the protection scope of the utility model. The protection scope of the present utility model should be determined by the protection scope defined in the claims.

Claims (9)

1. a hybrid vehicle lithium battery management devices, it is characterized in that, described hybrid vehicle lithium battery management devices comprises STM32 processor, battery parameter acquisition system, charge-discharge system, human-computer interaction interface system, cooling system and warning circuit, the battery pack that battery parameter acquisition system and charge-discharge system are connected to hybrid vehicle lithium battery is used for detecting battery state, the input of STM32 processor connects battery parameter acquisition system and charge-discharge system, the output of STM32 processor connects human-computer interaction interface system, cooling system and warning circuit.

2. hybrid vehicle lithium battery management devices according to claim 1, it is characterized in that, described battery parameter acquisition system comprises battery detection module, battery detection module comprises 8 electric power detection submodules, electric power detection submodule is connected with 8 set of monomers be provided with in battery pack simultaneously, each set of monomers comprises 6 monomers, and each set of monomers is connected to electric power detection submodule, and electric power detection submodule is all connected to STM32 processor and controls the work of electric power detection submodule.

3. hybrid vehicle lithium battery management devices according to claim 2, it is characterized in that, that described battery detection module adopts is battery management chip AD7280, that electric power detection submodule adopts is battery meter chip DS2788, and battery detection module comprises multiple equalization charging circuit be made up of resistance and metal-oxide-semiconductor.

4. hybrid vehicle lithium battery management devices according to claim 2, it is characterized in that, 8 electric power detection submodules in described battery detection module are connected by daisy chain, connect voltage, temperature information data that detection 48 pieces of monomers are used for gathering monomer simultaneously.

5. hybrid vehicle lithium battery management devices according to claim 1, it is characterized in that, described charge-discharge system comprises bi-directional DC-DC module, first current detection module, second current detection module and relay handover module, first current detection module connects on the battery pack, the battery pack data that the concurrent censorship of first current detection module connection STM32 processor measures are to STM32 processor, relay handover module connects the first current detection module, second current detection module and STM32 processor, STM32 processor connects bi-directional DC-DC module and the second current detection module.

6. hybrid vehicle lithium battery management devices according to claim 1, it is characterized in that, described human-computer interaction interface system comprises entire car controller, CAN module and Vehicular display device, STM32 processor connects CAN module, CAN model calling entire car controller, entire car controller connects Vehicular display device.

7. hybrid vehicle lithium battery management devices according to claim 1, it is characterized in that, described cooling system comprises multi-point temp detection module and radiating circuit, multi-point temp detection module connects on the battery pack and gathers the temperature information of battery pack, STM32 processor connects multi-point temp detection module and receives the Detection Information of multi-point temp detection module, and multi-point temp detection module connects radiating circuit.

8. hybrid vehicle lithium battery management devices according to claim 1, is characterized in that, described hybrid vehicle lithium battery management devices also comprises remote control terminal, and remote control terminal connects human-computer interaction interface system.

9. hybrid vehicle lithium battery management devices according to claim 8, it is characterized in that, described remote control terminal comprises WIFI wireless module, wireless router, central server, control terminal and smart mobile phone, human-computer interaction interface system connects WIFI wireless module and passes through WIFI wireless module data information, wireless router connects WIFI wireless module and receiving data information, wireless router is connected with central server, information is also sent to control terminal by central server connection control terminal, control terminal sends smart mobile phone fault message to by networking.