Utilization system and utilization method for whole retired battery pack of passenger car

Abstract

The invention relates to a utilization system and a utilization method of a whole retired battery pack of a passenger car in the field of passenger car batteries, the utilization system comprises a retired battery cluster and a retired battery management system, the retired battery cluster is connected with the retired battery management system through a signal line, and the retired battery cluster is connected with a direct current converter through a distribution line; the direct current converter is connected with a new battery management system and an electric energy management system through signal lines, the new battery management system is in communication connection with the retired battery management system through a protocol conversion card, and the communication of the retired battery management system is connected to the protocol conversion card; as a battery chip protocol on the retired battery management system is standard and universal, the protocol conversion card converts a communication protocol into a standard communication protocol of a conventional new battery management system in the market for adaptation, and the communication protocol of the retired battery management system is converted into a standard protocol adaptive to the new battery management system through the protocol conversion card. The problem of communication of the retired battery of the passenger car is solved.

Description

Technical Field

[0001] The present invention relates to the field of passenger vehicle batteries, and in particular to a system and method for utilizing a whole package of retired passenger vehicle batteries. Background Art

[0002] New energy, also known as unconventional energy, refers to newly developed energy in addition to traditional energy such as coal, oil, and natural gas. New energy is usually environmentally friendly and can be used sustainably. It is an energy resource that humans have only recently begun to develop and utilize and needs further research and development. There are many types of new energy, such as solar energy, biomass energy, wind energy, nuclear fusion energy, etc. Most of them realize energy utilization through power generation.

[0003] New energy technologies are widely used in various industries. Currently, the largest and most widespread application is in the transportation industry. For example, electric vehicles are gradually replacing traditional fuel vehicles. New energy passenger vehicles use non-fossil fuels as a power source, so they do not produce exhaust emissions during use and are environmentally friendly. Compared with traditional fuel vehicles, new energy passenger vehicles have obvious advantages in energy consumption and can significantly reduce energy consumption. New energy passenger vehicles usually integrate advanced battery technology, motor technology, control technology, etc., and have a high technological content.

[0004] With the rapid development of new energy, the market for the reuse of retired passenger car batteries is growing. Traditionally, retired passenger car batteries are mainly disassembled and reassembled for reuse. As the capacity of passenger car batteries increases and the cooling method becomes more advanced, retired passenger car batteries can no longer be disassembled and reassembled for reuse. Only the retired batteries can be used as a whole package. However, the communication protocol of the retired battery management system cannot be obtained through car companies. The communication protocol of the retired battery management system is different from that of the new battery management system, and data transmission cannot be achieved between them. Summary of the invention

[0005] In order to overcome the shortcomings of the existing technical solutions, the present invention provides a system and method for utilizing a whole pack of retired batteries for passenger vehicles, which can effectively solve the technical problem that a new battery management system and a retired battery management system cannot exchange data.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A system for utilizing a whole pack of retired batteries for passenger vehicles comprises a retired battery cluster and a retired battery management system. The retired battery cluster comprises more than two old battery boxes, which are connected in series with each other. The retired battery cluster is connected to the retired battery management system via a signal line. The retired battery cluster is connected to a DC converter via a distribution line, and the DC converter is connected to a new battery management system and an electric energy management system via a signal line. The new battery management system and the retired battery management system are communicated via a protocol conversion card, and the protocol conversion card is used to convert the communication protocol of the retired battery management system into a standard protocol adapted to the new battery management system. The retired battery management system is used to collect the voltage and temperature of the cells in the retired battery cluster in real time, and balance the cells of the battery pack according to the balancing instructions of the new battery management system. The new battery management system is used to read the cell voltage and temperature information data, and calculate parameters and send control instructions according to an algorithm. The electric energy management system is used to control the working state of the DC converter, and the retired battery cluster is charged and discharged through the DC converter.

[0008] Furthermore, a starting and protection circuit is provided between the retired battery cluster and the DC converter, and the starting and protection circuit is automatically disconnected when the current passing through is abnormal.

[0009] Furthermore, the starting and protection circuit includes a circuit breaker, a fuse and a contactor, which are connected in series in sequence. The contactor is used to control the start and stop of the circuit. When a fault occurs in the circuit, the circuit breaker or the fuse will quickly cut off the circuit.

[0010] Furthermore, the fuse is connected in parallel with a soft-start circuit, and the soft-start circuit is used to gradually increase the voltage so as to reduce the starting current.

[0011] Furthermore, the starting and protection circuit is connected to the new battery management system via a dry node, and the dry node is used to transmit the status of the starting and protection circuit and the instructions of the new battery management system, thereby controlling the conduction and disconnection of the circuit breaker and the fuse.

[0012] Furthermore, the starting and protection circuit is also connected in series with a voltage and current detection device, a leakage current detection device and an insulation detection device. The voltage and current detection device is used to monitor the voltage and current values ​​in the starting and protection circuit in real time to ensure that they are within a normal range. The leakage current detection part is used to detect the leakage current in the starting and protection circuit, that is, the current that flows directly into the earth through the conductor without passing through the electrical equipment. The insulation monitoring part is used to monitor the insulation performance in the starting and protection circuit.

[0013] Furthermore, the protocol conversion card is composed of a northbound communication protocol, a core chip and a bridge chip, and the northbound communication protocol and the bridge chip are both electrically connected to the core chip.

[0014] A method for utilizing a whole pack of retired passenger vehicle batteries, the method is an operation process of a system for utilizing a whole pack of retired passenger vehicle batteries, comprising the following steps:

[0015] S1, the retired battery management system collects battery voltage and temperature data of the retired battery cluster. The battery voltage range of the retired battery cluster is 2.5V-3.65V, and the temperature range of the retired battery cluster is -20℃-60℃;

[0016] S2, the retired battery management system transmits the collected data to the protocol conversion card;

[0017] S3, the protocol conversion card converts the data into a standard protocol received by the new battery management system and transmits it to the new battery management system;

[0018] S4, the new battery management system transmits the data of the retired battery cluster to the DC converter. The data of the retired battery cluster includes the battery voltage of the old battery box, the battery temperature of the old battery box, the total voltage of the retired battery cluster, the total current of the retired battery cluster and the insulation resistance of the total positive and negative electrodes of the retired battery cluster to the ground. The battery voltage of the old battery box is 2.8V-3.6V, the battery temperature of the old battery box is 0℃-40℃, and the insulation resistance of the total positive and negative electrodes of the retired battery cluster to the ground is ≥1MΩ;

[0019] S5, the DC converter transmits the battery data of the retired battery cluster and the operation data of the DC converter to the power management system. The data of the retired battery cluster includes the battery voltage of the old battery box, the battery temperature of the old battery box, the total voltage of the retired battery cluster, the total current of the retired battery cluster and the insulation resistance of the total positive and negative electrodes of the retired battery cluster to the ground. The operation data of the DC converter includes the operation status of the DC converter, alarm information and charge and discharge power. The battery voltage of the old battery box is 2.8V-3.6V, the battery temperature of the old battery box is 0℃-40℃, and the insulation resistance of the total positive and negative electrodes of the retired battery cluster to the ground is ≥1MΩ;

[0020] S6, the power management system transmits control data to the DC converter, and realizes the charging and discharging of the retired battery cluster through the DC converter. The control data includes a switch signal and a target charging and discharging power.

[0021] Compared with the prior art, the beneficial effect of the present invention is that the communication protocol of the retired battery management system is converted into a standard protocol adapted to the new battery management system through the protocol conversion card, and the communication of the retired battery management system is first connected to the protocol conversion card. Since the battery chip protocol on the retired battery management system is standard and universal, the protocol conversion card converts the communication protocol into the communication protocol of the standard conventional new battery management system on the market for adaptation, so that the new battery management system can communicate with the retired battery management system, and at the same time, the voltage and current calculation, insulation resistance detection, charge and discharge management, battery cluster alarm and protection of the old battery box can be performed, and the northbound standard protocol can be provided to the power management system for monitoring and management, thus solving the problem of communication of retired batteries in passenger cars, and the old battery box only needs to be replaced with a new battery management system and a protocol conversion card to complete the rework and utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the whole package utilization system of retired passenger car batteries in the present invention;

[0023] Figure 2 It is a schematic diagram of the communication circuit of the present invention;

[0024] Figure 3 A sampling schematic diagram of a retired battery management system in the present invention;

[0025] Figure 4 It is a communication diagram of the retired battery management system in the present invention;

[0026] Figure 5 It is a communication sampling schematic diagram of the new battery management system in the present invention;

[0027] Figure 6 It is a schematic diagram of the protocol conversion card in the present invention. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Combine the following Figure 1-Figure 6 A system and method for utilizing a whole package of retired passenger vehicle batteries of the present invention are described in detail:

[0030] A system for utilizing a whole pack of retired batteries for passenger vehicles comprises a retired battery cluster and a retired battery management system. The retired battery cluster comprises more than two old battery boxes, which are connected in series with each other. The retired battery cluster is connected to the retired battery management system via a signal line. The retired battery cluster is connected to a DC converter via a distribution line. The DC converter is connected to a new battery management system and an electric energy management system via a signal line. The electric energy management system is also connected to the new battery management system via a signal line. The new battery management system and the retired battery management system are connected for communication via a protocol conversion card. The protocol conversion card is used to convert the communication protocol of the retired battery management system into a standard protocol adapted to the new battery management system. The retired battery management system is used to collect the voltage and temperature of the cells in the retired battery cluster in real time, and balance the cells of the battery pack according to the balancing instructions of the new battery management system. The new battery management system is used to read the cell voltage and temperature information data, and calculate parameters and send control instructions according to an algorithm. The electric energy management system is used to control the working state of the DC converter. The retired battery cluster is charged and discharged via the DC converter.

[0031] Through the protocol conversion card, the communication protocol of the retired battery management system is converted into a standard protocol adapted to the new battery management system. First, the communication of the retired battery management system is connected to the protocol conversion card. Since the battery chip protocol on the retired battery management system is standard and universal, the protocol conversion card converts the communication protocol into the standard communication protocol of the new battery management system on the market for adaptation. In this way, the new battery management system can communicate with the retired battery management system. At the same time, the voltage and current calculation, insulation resistance detection, charge and discharge management, battery cluster alarm and protection of the old battery box can be performed. It can also provide the northbound standard protocol to the power management system for monitoring and management, thus solving the problem of retired battery communication in passenger cars. For the old battery box, it only needs to be replaced with a new battery management system and a protocol conversion card to complete the rework and utilization, solving the problem of incompatible communication protocols. The retired battery cluster can realize the charging and discharging of power and the balanced management of the battery cells under the monitoring and control of the new battery management system, which improves the reuse efficiency of retired batteries and extends their service life.

[0032] A starting and protection circuit is arranged between the retired battery cluster and the DC converter. When the current passing through is abnormal, the starting and protection circuit will automatically disconnect. The protection circuit includes a circuit breaker, a fuse and a contactor. The circuit breaker, the fuse and the contactor are connected in series in sequence. The contactor controls the closing and disconnection of the contacts by electromagnetic force, thereby realizing the on-off of the circuit and controlling the start and stop of the circuit. When a fault occurs in the circuit, the circuit breaker or the fuse will quickly cut off the circuit. The fuse is connected in parallel with a soft-start circuit. The soft-start circuit is used for the circuit for smoothly starting the load. It can reduce the starting current by controlling the gradual increase of the power supply voltage, thereby protecting the circuit and the equipment. During startup, the soft-start circuit can significantly reduce the starting current to avoid impact on the circuit. The starting and protection circuit is connected to the new battery management system through a dry node. The dry node is used to transmit the state of the starting and protection circuit and the instructions of the new battery management system, thereby controlling the conduction and disconnection of the circuit breaker and the fuse. In the normal starting process, the circuit breaker is closed first, and the new battery management system controls the start of the soft-start circuit. After the current is normal, the contactor is closed and the soft-start circuit is disconnected.

[0033] The starting and protection circuit is also connected in series with a voltage and current detection device, a leakage current detection device and an insulation detection device. The voltage and current detection device is used to monitor the voltage and current values ​​in the starting and protection circuit in real time to ensure that they are within the normal range. When the voltage or current exceeds the set value, the voltage and current detection device will sound an alarm or cut off the power supply to protect the safety of the equipment and the circuit. The leakage current detection part is used to detect the leakage current in the starting and protection circuit, that is, the current that flows directly into the earth through the conductor without passing through the electrical equipment. When the leakage current exceeds the set value, the detection device will sound an alarm or cut off the power supply to prevent the occurrence of dangerous accidents such as electric shock and fire. The insulation monitoring part is used to monitor the insulation performance in the starting and protection circuit. When the insulation resistance is reduced or a short circuit occurs, the monitoring device will sound an alarm or cut off the power supply to ensure the safe operation of the equipment and the circuit.

[0034] The protocol conversion card consists of a northbound communication protocol, a core chip and a bridge chip. The northbound communication protocol and the bridge chip are electrically connected to the core chip. The northbound communication protocol is CAN and RS485 communication protocols. The bridge chips include LTC6820, Max17841, BQ79600 and L9963T. The core chip is GD32F303. The daisy chain communication protocol of the retired battery management system is converted into CAN or RS485 communication protocol to adapt to the standard protocol of the new battery management system. It has universality and scalability, can adapt to retired battery management systems of different brands and models, and can flexibly access retired battery clusters from different sources without the need for special adaptation processing for each old battery box, thereby greatly enhancing the flexibility and scalability of the system.

[0035] A method for utilizing a whole pack of retired passenger vehicle batteries, the method is an operation process of a system for utilizing a whole pack of retired passenger vehicle batteries, comprising the following steps:

[0036] S1, the retired battery management system collects battery voltage and temperature data of the retired battery cluster. The battery voltage range of the retired battery cluster is 2.5V-3.65V, and the temperature range of the retired battery cluster is -20℃-60℃;

[0037] S2, the retired battery management system transmits the collected data to the protocol conversion card;

[0038] S3, the protocol conversion card converts the data into a standard protocol received by the new battery management system and transmits it to the new battery management system;

[0039] S4, the new battery management system transmits the data of the retired battery cluster to the DC converter. The data of the retired battery cluster includes the battery voltage of the old battery box, the battery temperature of the old battery box, the total voltage of the retired battery cluster, the total current of the retired battery cluster and the insulation resistance of the total positive and negative electrodes of the retired battery cluster to the ground. The battery voltage of the old battery box is 2.8V-3.6V, the battery temperature of the old battery box is 0℃-40℃, and the insulation resistance of the total positive and negative electrodes of the retired battery cluster to the ground is ≥1MΩ;

[0040] S5, the DC converter transmits the battery data of the retired battery cluster and the operation data of the DC converter to the power management system. The data of the retired battery cluster includes the battery voltage of the old battery box, the battery temperature of the old battery box, the total voltage of the retired battery cluster, the total current of the retired battery cluster and the insulation resistance of the total positive and negative electrodes of the retired battery cluster to the ground. The operation data of the DC converter includes the operation status of the DC converter, alarm information and charge and discharge power. The battery voltage of the old battery box is 2.8V-3.6V, the battery temperature of the old battery box is 0℃-40℃, and the insulation resistance of the total positive and negative electrodes of the retired battery cluster to the ground is ≥1MΩ;

[0041] S6, the power management system transmits control data to the DC converter, and realizes the charging and discharging of the retired battery cluster through the DC converter. The control data includes a switch signal and a target charging and discharging power.

[0042] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A system for utilizing a whole package of retired batteries for passenger vehicles, comprising a retired battery cluster and a retired battery management system, wherein the retired battery cluster comprises two or more old battery boxes, the two or more old battery boxes are connected in series, and the retired battery cluster is connected to the retired battery management system via a signal line, characterized in that: The retired battery cluster is connected to a DC converter via a distribution line, and the DC converter is connected to a new battery management system and an electric energy management system via a signal line. The new battery management system and the retired battery management system are communicated via a protocol conversion card, and the protocol conversion card is used to convert the communication protocol of the retired battery management system into a standard protocol adapted to the new battery management system. The retired battery management system is used to collect the cell voltage and temperature in the retired battery cluster in real time, and balance the battery pack cells according to the balancing instructions of the new battery management system. The new battery management system is used to read the cell voltage and temperature information data, and calculate parameters and send control instructions according to the algorithm. The electric energy management system is used to control the working state of the DC converter, and the retired battery cluster is charged and discharged through the DC converter.

2. The system for utilizing a whole package of retired passenger vehicle batteries according to claim 1, characterized in that: A starting and protection circuit is provided between the retired battery cluster and the DC converter, and the starting and protection circuit is automatically disconnected when the current passing through is abnormal.

3. The system for utilizing a whole package of retired passenger vehicle batteries according to claim 2, characterized in that: The starting and protection circuit includes a circuit breaker, a fuse and a contactor, which are connected in series in sequence. The contactor is used to control the start and stop of the circuit. When a fault occurs in the circuit, the circuit breaker or the fuse will quickly cut off the circuit.

4. The system for utilizing a whole package of retired passenger vehicle batteries according to claim 3 is characterized in that: The fuse is connected in parallel with a soft-start circuit, which is used to gradually increase the voltage so as to reduce the starting current.

5. The system for utilizing a whole package of retired passenger vehicle batteries according to claim 3 is characterized in that: The starting and protection circuit is connected to the new battery management system via a dry node, which is used to transmit the status of the starting and protection circuit and the instructions of the new battery management system, thereby controlling the conduction and disconnection of the circuit breaker and the fuse.

6. The system for utilizing a whole package of retired passenger vehicle batteries according to claim 3 is characterized in that: The starting and protection circuit is also connected in series with a voltage and current detection device, a leakage current detection device and an insulation detection device. The voltage and current detection device is used to monitor the voltage and current values ​​in the starting and protection circuit in real time to ensure that they are within a normal range. The leakage current detection part is used to detect the leakage current in the starting and protection circuit, that is, the current that flows directly into the earth through the conductor without passing through the electrical equipment. The insulation monitoring part is used to monitor the insulation performance in the starting and protection circuit.

7. The system for utilizing a whole package of retired passenger vehicle batteries according to claim 1, characterized in that: The protocol conversion card is composed of a northbound communication protocol, a core chip and a bridge chip, and both the northbound communication protocol and the bridge chip are electrically connected to the core chip.

8. A method for utilizing a whole package of retired passenger car batteries, characterized in that: The method is an operation process of a system for utilizing a whole pack of retired passenger vehicle batteries as described in any one of claims 1 to 7, comprising the following steps: S1, the retired battery management system collects battery voltage and temperature data of the retired battery cluster. The battery voltage range of the retired battery cluster is 2.5V-3.65V, and the temperature range of the retired battery cluster is -20℃-60℃; S2, the retired battery management system transmits the collected data to the protocol conversion card; S3, the protocol conversion card converts the data into a standard protocol received by the new battery management system and transmits it to the new battery management system; S4, the new battery management system transmits the data of the retired battery cluster to the DC converter. The data of the retired battery cluster includes the battery voltage of the old battery box, the battery temperature of the old battery box, the total voltage of the retired battery cluster, the total current of the retired battery cluster and the insulation resistance of the total positive and negative electrodes of the retired battery cluster to the ground. The battery voltage of the old battery box is 2.8V-3.6V, the battery temperature of the old battery box is 0℃-40℃, and the insulation resistance of the total positive and negative electrodes of the retired battery cluster to the ground is ≥1MΩ; S5, the DC converter transmits the battery data of the retired battery cluster and the operation data of the DC converter to the power management system. The data of the retired battery cluster includes the battery voltage of the old battery box, the battery temperature of the old battery box, the total voltage of the retired battery cluster, the total current of the retired battery cluster and the insulation resistance of the total positive and negative electrodes of the retired battery cluster to the ground. The operation data of the DC converter includes the operation status of the DC converter, alarm information and charge and discharge power. The battery voltage of the old battery box is 2.8V-3.6V, the battery temperature of the old battery box is 0℃-40℃, and the insulation resistance of the total positive and negative electrodes of the retired battery cluster to the ground is ≥1MΩ; S6, the power management system transmits control data to the DC converter, and realizes the charging and discharging of the retired battery cluster through the DC converter. The control data includes a switch signal and a target charging and discharging power.

Images