CN209691889U

CN209691889U - A kind of battery management system

Info

Publication number: CN209691889U
Application number: CN201822020082.2U
Authority: CN
Inventors: 李航; 文黎阳; 雷晶晶; 欧阳文斌; 黄靖
Original assignee: Sunwoda Huizhou Power New Energy Co Ltd
Current assignee: Sunwoda Huizhou Power New Energy Co Ltd
Priority date: 2018-12-04
Filing date: 2018-12-04
Publication date: 2019-11-26
Anticipated expiration: 2028-12-04

Abstract

A kind of battery management system provided by the utility model, including analog front-end module, high-speed converters, MCU processing module, current detection module, stagnation pressure detection module, low-voltage power supply management module, wake-up module, CAN communication module, analog signal detection module, HVIL detection module, insulation monitoring module, diagnostic module, NVM module and real-time clock module；The current detection module and the stagnation pressure detection module are directly connect with the analog front-end module by the utility model, detection data is reported to module at MCU using daisy chain and high-speed converters, balanced relevant strategy still can be efficiently executed while reducing the components uses such as MCU, CAN；The insulation monitoring module is connect with the MCU processing module, data processing is carried out using the MCU processing module, Insulation monitoring is carried out using non-equilibrium electric-resistivity method simultaneously, the MCU of data processing is not only omitted, the electrical isolation design between high-low pressure is also reduced, while H.D reliability can also be proposed.

Description

A kind of battery management system

Technical field

The utility model belongs to new-energy automobile power battery management system field more particularly to a kind of battery management system System.

Background technique

With the fast development of new energy industry, new-energy automobile is increasingly accepted by people, and electrokinetic cell system is The key position of new-energy automobile.Because lithium ion battery has, small in size, energy density is high, storage life is long, memoryless effect It answers, the excellent performances such as high voltage and self-discharge rate are low, is widely applied in new-energy automobile field.

And battery management system is the core component of entire electrokinetic cell system, it can to electrokinetic cell system Safe and effective operation carries out real-time monitoring and effective control.

In the prior art, it is still had about the technology of battery management system and designs lengthy and jumbled complicated, required member device Problem more than part, such as front end analogue module include multiple MCU and CAN communication module, and the design of insulation monitoring module not only needs Individual MCU is connected, with greater need for isolation high-low pressure.

Summary of the invention

To solve the above-mentioned problems, the utility model provides a kind of battery management system, and design advantages of simple can be reduced The use of many components, while H.D reliability can also be proposed.

A kind of battery management system provided by the utility model, including analog front-end module, high-speed converters, MCU processing Module, current detection module, stagnation pressure detection module, low-voltage power supply management module, wake-up module, CAN communication module, analog signal Detection module, HVIL detection module, insulation monitoring module, diagnostic module, NVM module and real-time clock module；Before the simulation End module includes the first AFE(analog front end), the second AFE(analog front end), N AFE(analog front end), and N number of AFE(analog front end) is communicated by daisy chain Connection, first analog front-end module and the high-speed converters are communicated to connect by daisy chain；

Further, the high-speed converters other end and the MCU processing module connect；

Further, the analog front-end module is connect with the current detection module, the stagnation pressure detection module；

Further, it is based on shunting that the current detection module, which is connect to the detection of electric current with the analog front-end module, The use of device, current divider are linked into the total negative terminal of electrokinetic cell system, the electricity that the electric current of electrokinetic cell system is generated by current divider Press signal by Double-strand transmission to battery management system signal input port, the voltage signal by port filtering processing Sample quantization is carried out by the analog front-end module, the current detection module afterwards, then is passed by the analog front-end module It is directed at the MCU processing module;

Further, ESD protection is done in the port for current divider voltage signal being received to battery management system.

Further, the stagnation pressure detection module, which connect the scheme detected to stagnation pressure with the analog front-end module, is Stagnation pressure is accessed resistance pressure-dividing network by the application based on resistance pressure-dividing network, and the voltage signal after partial pressure is by filtering processing, warp The analog front-end module acquisition quantification treatment is crossed, obtains stagnation pressure value further according to the ratio calculation of resistance pressure-dividing network resistance, from And complete stagnation pressure detection.

Further, the MCU processing module respectively with the low-voltage power supply management module, wake-up module, described CAN communication module, the analog signal detection module, the HVIL detection module, the insulation monitoring module, the diagnosis mould Block, the NVM module are connected with the real-time clock module；

Further, the insulation monitoring module is directly connect with affiliated MCU processing module, handles mould using the MCU Block carries out data processing, while carrying out Insulation monitoring using non-equilibrium electric-resistivity method.

The utility model has the advantages that a kind of battery management system of the utility model, the current detection module and the stagnation pressure are examined It surveys module directly to connect with the analog front-end module, reports testing number to module at MCU using daisy chain and high-speed converters According to still capable of efficiently executing balanced relevant strategy while reducing the components use such as MCU, CAN；By the Insulation monitoring mould Block is connect with the MCU processing module, carries out data processing using the MCU processing module, while using non-equilibrium electric-resistivity method Insulation monitoring is carried out, the MCU of a data processing is not only omitted, also reduces the electrical isolation design between high-low pressure, together When can also propose H.D reliability.

Detailed description of the invention

A kind of battery management system block diagram of Fig. 1 the utility model

Fig. 2 is that current detection scheme opens up complement

Fig. 3 is that stagnation pressure detection scheme opens up complement

Fig. 4 is that Insulation monitoring scheme opens up complement

Specific embodiment

In order to be more easily understood the solution and advantage of the utility model, done further below in conjunction with attached drawing Detailed description.

As shown in Figure 1, a kind of battery management system provided by the utility model, including analog front-end module 1, high-speed transitions Device 13, MCU processing module 14, current detection module 2, stagnation pressure detection module 3, low-voltage power supply management module 4, wake-up module 5, CAN communication module 6, analog signal detection module 7, HVIL detection module 8, insulation monitoring module 9, diagnostic module 10, NVM module 11 and real-time clock module 12；Analog front-end module 1 includes the first AFE(analog front end), the second AFE(analog front end), N AFE(analog front end), institute It states N number of AFE(analog front end) to communicate to connect by daisy chain, first analog front-end module and the high-speed converters 13 pass through chrysanthemum Pattern chain communication connection；

Further, 13 other end of high-speed converters is connect with the MCU processing module 14；

Further, the analog front-end module 1 is connect with the current detection module 2, the stagnation pressure detection module 3；

Further, the MCU processing module 14 respectively with the low-voltage power supply management module 4, the wake-up module 5, The CAN communication module 6, the analog signal detection module 7, the HVIL detection module 8, the insulation monitoring module 9, institute Diagnostic module 10, the NVM module 11 and the real-time clock module 12 is stated to connect；

In this embodiment, as depicted in figs. 1 and 2, current detection module 2 is connect with analog front-end module 1 to electricity The detection scheme of stream is the use based on current divider, and current divider is linked into the total negative terminal of electrokinetic cell system, electrokinetic cell system Electric current passes through signal input port of the Double-strand transmission to battery management system, the voltage by the voltage signal that current divider generates Signal carries out sample quantization by analog front-end module 1 after the filtering processing of port, then passes through height by analog front-end module 1 Fast converter 13 is conducted to MCU processing module 14.That is, the electricity that will be connect in prior art with MCU processing module Stream detection module 2 moves to front, and is directly connected to analog front-end module 1, is communicated by daisy chain, so that it may realize CAN communication With the function of MCU, the use of CAN and MCU is omitted.

Further, ESD protection is done in the port for receiving current divider voltage signal to battery management system, in BMS environment temperature When degree changes, need to carry out temperature drift calibration.

In the present embodiment, as shown in figures 1 and 3, stagnation pressure detection module 3 connect with analog front-end module 1 to stagnation pressure into Row detection, scheme are as follows: stagnation pressure is accessed resistance pressure-dividing network by battery management system closure switch Q1, the voltage letter after partial pressure Number by filtering processing, by analog front-end module 1 acquire quantification treatment, further according to R1, R2 resistance in resistance pressure-dividing network Ratio calculation obtains stagnation pressure value, to complete stagnation pressure detection.That is, stagnation pressure detection module 3 and analog front-end module 1 is straight It connects in succession, reduces the use of CAN and MCU, still can use the detection that resistance pressure-dividing network completes stagnation pressure.

Preferably, R1, R2 use Low Drift Temperature, high voltage, high value, high-precision resistance in resistor voltage divider network；

Preferably, switch Q1 is the MOS switch that pressure voltage is more than or equal to 600V；

In the present embodiment, as shown in Figure 1 and Figure 4, insulation monitoring module 9 accesses MCU processing module 14, with MCU processing 14 collective effect of module carries out Insulation monitoring using non-equilibrium electric-resistivity method, that is to say, that connect insulation monitoring module 9 at MCU Module 14 is managed, a MCU is shared with system, is not only able to achieve Insulation monitoring function, also reduces electrical isolation design, while Reduce the use of CAN and extra MCU.Its detection scheme is as follows:

As shown in figure 4, the program is detected using non-equilibrium electric-resistivity method, including the equivalent anode electricity of electrokinetic cell system Hinder Rp, negative terminal insulation impedance Rn, resistance R3(R3=Ra+Rb), R4(R4=Rc+Rd), switch Q1, Q2, battery management system control Switch Q1 and Q2, resistance R3, R4 are linked into measure loop, the voltage value in R3, R4 resistor voltage divider network are acquired, under utilization The equivalent anode resistance Rp of battery system, negative terminal insulation impedance Rn value is calculated in formula, to judge insulation performance.

Specific switch control mode is as follows:

Step 1: control switch Q1, Q2 closure can obtain:

(formula one)

(formula two)

Step 2: control switch Q1 is disconnected, Q2 is closed, and can be obtained:

(formula three)

Step 3: control switch Q1 closure, Q2 are disconnected, and can be obtained；

(formula four)

Step 4: simultaneous formula one, two, three, four:

By controlling above and detection method, the positive and negative end insulation impedance of battery system can be measured.

Preferably, switch Q2, Q3 is small, photoMOS switch of the pressure resistance greater than 1000V that leak electricity;

Preferably, shown resistor network Ra, Rb, Rc, Rd are Low Drift Temperature, high voltage, high value, high-precision resistance.

A kind of battery management system of the invention is described in detail above in conjunction with the drawings and specific embodiments, but It is that the present invention is not limited to embodiments describe above, in short, within the knowledge of those skilled in the art, no It is detached from the various change that present inventive concept is made, is still within the scope of the present invention.

Claims

1. a kind of battery management system, including analog front-end module, high-speed converters, MCU processing module, current detection module, Stagnation pressure detection module, low-voltage power supply management module, wake-up module, CAN communication module, analog signal detection module, HVIL detection Module, insulation monitoring module, diagnostic module, NVM module and real-time clock module；It is characterized in that, the analog front-end module It is connect with the current detection module, the stagnation pressure detection module；The MCU processing module respectively with the low-voltage power supply management It is module, the wake-up module, the CAN communication module, the analog signal detection module, the HVIL detection module, described Insulation monitoring module, the diagnostic module, the NVM module are connected with the real-time clock module；The analog front-end module It is communicated to connect with the high-speed converters by daisy chain, the current detection module is connect with the analog front-end module to electricity The detection of stream is the use based on current divider, and the stagnation pressure detection module is connect with the analog front-end module examines stagnation pressure The scheme of survey is the application based on resistance pressure-dividing network, and the insulation monitoring module is directly connect with the MCU processing module, benefit Data processing is carried out with the MCU processing module, while Insulation monitoring is carried out using non-equilibrium electric-resistivity method.

2. a kind of battery management system according to claim 1, which is characterized in that the analog front-end module includes first AFE(analog front end), the second AFE(analog front end), N AFE(analog front end) pass through daisy chain between N number of AFE(analog front end) and communicate to connect.

3. a kind of battery management system according to claim 2, which is characterized in that the high-speed converters pass through daisy chain Communication is connect with first analog front-end module.

4. a kind of battery management system according to claim 1, which is characterized in that the high-speed converters other end and institute State MCU processing module company.

5. a kind of battery management system according to claim 1, which is characterized in that the battery management system, which receives, to be shunted The port of device voltage signal need to do ESD protection.