New energy vehicle-mounted battery management and acquisition device

Abstract

The utility model relates to a new energy vehicle-mounted battery management and acquisition device, and belongs to the technical field of power battery management. The system comprises at least two acquisition units. Each acquisition unit comprises a slave control acquisition module, a communication module and a microcontroller, wherein the slave control acquisition module is used for being connected with the corresponding battery module to acquire electric quantity information data of the battery module, and the microcontroller is connected with the slave control acquisition module and the communication module in the same acquisition unit; wherein one acquisition unit is a first acquisition unit; the first acquisition unit further comprises a master control function module used for executing BMS master control operation, and the communication module in the first acquisition unit is further in communication connection with the communication modules in the other acquisition units through wire harnesses so as to receive data, processed by the microcontroller, acquired by the slave control acquisition modules in the other acquisition units. And the main control function module is also connected with the microcontroller in the first acquisition unit so as to interact data corresponding to BMS main control operation.

Description

Technical Field

[0001] The utility model belongs to the technical field of power battery management, and specifically relates to a new energy vehicle-mounted battery management and collection device. Background Art

[0002] The battery pack used in electric vehicles typically includes multiple battery modules or battery boxes connected in series. Each battery module and battery box requires a corresponding battery management system to manage the batteries, and the battery management system must be connected according to a predetermined wiring harness. In particular, as the driving range of the vehicle increases, the number of battery packs installed in the vehicle increases, and the number of modules within the packs also increases. This not only places higher demands on the battery management system, but also increases the cost of using the battery management system. In addition, with the application of distributed master-slave battery management systems, especially in multi-battery module and multi-battery box applications, battery management systems with multiple acquisition boards will face the problem of how to complete communication with the master control and the cost issue.

[0003] Currently, the existing distributed BMS battery management systems for new energy vehicle batteries mainly include two solutions. One solution is: the BMS acquisition system solution consists of a BMS master control and multiple slave controls, where the BMS master control is assembled on the entire vehicle, and the slave controls are distributed in the battery pack. CAN communication is used for information exchange between the master control and the slave controls. This arrangement requires a wiring harness to connect the master control and the slave controls, and an adapter harness is also required between the slave control and the electrical connector for communication. The problem with this solution is that the connection relationship between the master control and the slave control is complex, requiring an independent CAN communication network to realize information exchange between the master and the slave. In addition, the master control also requires a separate microprocessor for logic and related calculations, which will increase costs. Another solution is: the BMS acquisition system solution also consists of a BMS master control and multiple slave controls, where the communication method between the master and the slave is wireless communication. However, each acquisition unit needs to be equipped with a wireless communication module, which is costly and the signal transmission is susceptible to interference. Utility Model Content

[0004] The purpose of this utility model is to provide a new energy vehicle battery management and acquisition device to solve the problems in the prior art of complex and costly connection relationships between the master and slave controllers in the solution using a wired CAN communication network, and the signal transmission in the solution using wireless communication is susceptible to interference.

[0005] To solve the above technical problems, the present invention provides a new energy vehicle-mounted battery management and data collection device, comprising: at least two data collection units; each data collection unit includes a slave control data collection module for connecting to a corresponding battery module to collect electrical quantity information data of the battery module, a communication module, and a microcontroller connected to the slave control data collection module and the communication module in the same data collection unit;

[0006] One of the acquisition units is the first acquisition unit; the first acquisition unit also includes a main control function module for performing BMS main control operations. The communication module in the first acquisition unit is also connected to the communication modules in other acquisition units through wiring harness communication to receive data collected by the slave control acquisition modules in other acquisition units after processing by the microcontroller. The main control function module is also connected to the microcontroller in the first acquisition unit to exchange data corresponding to the BMS main control operation.

[0007] Furthermore, at least one acquisition unit further includes a communication conversion module, and the slave acquisition module and the microcontroller in the same acquisition unit are connected via the communication conversion module in the acquisition unit.

[0008] Furthermore, at least one acquisition unit also includes a power control module, which is arranged on the battery module corresponding to the acquisition unit. The output end of the power control module is connected to the microcontroller in the same acquisition unit, and the input end of the power control module is used to be respectively connected to the battery module corresponding to the acquisition unit and the communication conversion module in the same acquisition unit.

[0009] Furthermore, the main control function module is a module including contactor driving, SOX management and charge and discharge management functions.

[0010] Furthermore, the slave control acquisition module is a module including voltage acquisition, voltage balancing and temperature acquisition functions.

[0011] The beneficial effects of the above technical solution are as follows: the utility model provides a new new energy vehicle battery management and acquisition device, which connects the master control function module for executing the BMS master control operation with the MCU processing chip corresponding to the slave control acquisition module of an acquisition unit, so that the master control function module and the slave control acquisition module of the acquisition unit itself for realizing the slave control function share the same microcontroller, and the remaining acquisition units are connected to the acquisition unit through wiring harness communication to obtain the data collected by the slave control acquisition modules of other acquisition units to realize the master control function, thereby obtaining a first acquisition unit with both master and slave control functions, which is equivalent to integrating the main controller that realizes the BMS master control function with the slave control of a certain acquisition unit, thereby eliminating the connection line between the main controller and the slave control of the acquisition unit and the independent microcontroller required for the main controller, saving costs. At the same time, due to the use of wiring harness communication, the problem of signal transmission being susceptible to interference due to the use of wireless communication in the prior art can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural diagram of a new energy vehicle-mounted battery management and data collection device embodiment of the utility model. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0014] New energy vehicle battery management and collection device embodiment:

[0015] A new energy vehicle battery management and acquisition device in this embodiment integrates a main controller that realizes the BMS main control function with a slave control of a certain acquisition unit by sharing a microcontroller with a main control function module and a slave control acquisition module of an acquisition unit, and connecting the remaining acquisition units to the acquisition unit through a wiring harness. This can eliminate the connection lines between the main controller and the slave control of the acquisition unit and the independent microcontroller required for the main controller, saving costs. At the same time, due to the use of wiring harness communication, the problem of signal transmission being susceptible to interference due to the use of wireless communication in the prior art can be avoided.

[0016] The new energy vehicle battery management and acquisition device includes:

[0017] At least two acquisition units; each acquisition unit includes a slave acquisition module, a communication module, and a microcontroller connected to the slave acquisition module and the communication module in the same acquisition unit for respectively connecting to the corresponding battery module to collect the electrical quantity information data of the battery module;

[0018] One of the acquisition units is the first acquisition unit; the first acquisition unit also includes a main control function module for performing BMS main control operations. The communication module in the first acquisition unit is also connected to the communication modules in other acquisition units through wiring harness communication to receive data collected by the slave control acquisition modules in other acquisition units after processing by the microcontroller. The main control function module is also connected to the microcontroller in the first acquisition unit to exchange data corresponding to the BMS main control operation.

[0019] This embodiment connects the master control function module for performing BMS master control operations with the MCU processing chip corresponding to the slave control acquisition module of an acquisition unit, so that the master control function module and the slave control acquisition module of the acquisition unit itself for realizing the slave control function share the same microcontroller, and the remaining acquisition units are connected to the acquisition unit through wiring harness communication to obtain data collected by the slave control acquisition modules of other acquisition units to realize the master control function, thereby obtaining a first acquisition unit with both master and slave control functions, which is equivalent to integrating the main controller that realizes the BMS master control function with the slave control of a certain acquisition unit. This can eliminate the connection line between the main controller and the slave control of the acquisition unit and the independent microcontroller required for the main controller, saving costs. At the same time, due to the use of wiring harness communication, the problem of signal transmission being susceptible to interference due to the use of wireless communication in the prior art can be avoided.

[0020] In this embodiment, at least one acquisition unit further includes a communication conversion module, and the slave acquisition module and the microcontroller in the same acquisition unit are connected via the communication conversion module in the acquisition unit.

[0021] Specifically, the slave acquisition module and the microcontroller communicate via daisy chain to SPI.

[0022] In this embodiment, at least one acquisition unit also includes a power control module, which is arranged on the battery module corresponding to the acquisition unit. The output end of the power control module is connected to the microcontroller in the same acquisition unit, and the input end of the power control module is used to connect respectively to the battery module corresponding to the acquisition unit and the communication conversion module in the same acquisition unit.

[0023] Specifically, if Figure 1 The first acquisition unit shown is composed of circuits with master and slave functions. It is mainly responsible for the voltage and temperature acquisition of the first module and cell voltage balancing. It is also responsible for managing the total voltage acquisition, charging and discharging, and SOX management of the entire battery system. Other acquisition units are only responsible for single cell voltage acquisition, temperature acquisition, and cell voltage balancing control, and pass the collected data to the first acquisition unit.

[0024] In this embodiment, the main control function module is a module including contactor driving, SOX management and charge and discharge management functions.

[0025] The slave control acquisition module is a module that includes voltage acquisition, voltage balancing and temperature acquisition functions.

[0026] The primary acquisition unit, battery module, and slave acquisition module are connected via wiring harnesses. These units are responsible for collecting voltage and temperature data from the battery module and implementing balancing control. The primary acquisition unit's circuit board integrates a master control module, which provides charge and discharge management, contactor drive, total voltage acquisition, and SOX management. The power supply module provides power to the acquisition unit's internal communication circuits and MCU processing chip (microcontroller).

[0027] The other acquisition units consist of an MCU processing chip, a power control module, a slave acquisition module, a communication conversion module, and a communication module. The battery modules and slave acquisition modules of these other acquisition units are also connected to the modules via wiring harnesses to collect voltage and temperature. The collected data is then transmitted to the first acquisition unit via the communication module. CAN communication or daisy chain communication is used between the MCU processing chips.

[0028] Taking a battery system composed of two 51-cell battery packs as an example, the first acquisition unit is located in the first battery pack and is responsible for collecting 51 cell voltages and 8 temperature data within the first battery pack. The second acquisition unit is located in the second battery pack and is responsible for collecting 51 cell voltages and 8 temperature data within the second battery pack. The first acquisition unit is responsible for processing 102 cell voltages, 16 temperature data, and SOX calculations. After interacting with the entire vehicle, it can perform charge and discharge management. This eliminates the need for a separate BMS main controller on the entire vehicle, saving costs and improving the reliability of the battery management system.

[0029] While specific implementations have been described above, the present invention is not limited to these implementations. The fundamental concept of the present invention lies in the aforementioned basic scheme. Based on the teachings of this invention, those skilled in the art can devise various variations of models, formulas, and parameters without inventive effort. Changes, modifications, substitutions, and variations to the implementations that do not depart from the principles and spirit of this invention remain within the scope of protection of this invention.

Claims

1. A new energy vehicle battery management and collection device, characterized in that: The device includes: at least two acquisition units; each acquisition unit includes a slave control acquisition module and a communication module for respectively connecting to a corresponding battery module to collect electrical quantity information data of the battery module; and a microcontroller respectively connected to the slave control acquisition module and the communication module in the same acquisition unit; One of the acquisition units is the first acquisition unit; the first acquisition unit also includes a main control function module for performing BMS main control operations. The communication module in the first acquisition unit is also connected to the communication modules in other acquisition units through wiring harness communication to receive data collected by the slave control acquisition modules in other acquisition units after processing by the microcontroller. The main control function module is also connected to the microcontroller in the first acquisition unit to exchange data corresponding to the BMS main control operation.

2. The new energy vehicle battery management and acquisition device according to claim 1 is characterized in that: At least one acquisition unit further includes a communication conversion module, and the slave acquisition module and the microcontroller in the same acquisition unit are connected via the communication conversion module in the acquisition unit.

3. The new energy vehicle battery management and acquisition device according to claim 2 is characterized in that: At least one acquisition unit also includes a power control module, which is arranged on the battery module corresponding to the acquisition unit. The output end of the power control module is connected to the microcontroller in the same acquisition unit, and the input end of the power control module is used to be respectively connected to the battery module corresponding to the acquisition unit and the communication conversion module in the same acquisition unit.

4. The new energy vehicle battery management and acquisition device according to claim 1 is characterized in that: The main control function module is a module including contactor driving, SOX management and charge and discharge management functions.

5. The new energy vehicle battery management and acquisition device according to claim 1 is characterized in that: The slave control acquisition module is a module including voltage acquisition, voltage balancing and temperature acquisition functions.

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