CN106532800A - Battery management system with parallel connection of multiple BMS modules and realization method thereof - Google Patents

Abstract

The invention discloses a method for realizing a battery management system in which a plurality of BMS modules are connected in parallel. The steps include: S1, connecting a plurality of BMS modules in parallel, and setting any one of the BMS modules as the main module, and the remaining BMS modules as sub-modules; S2. The sub-module sends its own module data to the main module, and the main module receives the data of each sub-module, and processes the data of its own module and the data of the sub-modules. The implementation method of a battery management system with multiple BMS modules connected in parallel provided by the present invention is provided with a main module and a sub-module in multiple BMS modules, and each BMS module has a clear division of labor, which improves the use efficiency of the battery management system and increases the reliability of the battery management system. sex. At the same time, the main module also monitors the data collection of each BMS module in real time. If data or information is missing, it can immediately control and stop the work of each BMS module to improve the safety of the battery management system.

Description

A battery management system with multiple BMS modules connected in parallel and its implementation method

technical field

The invention relates to the field of battery management systems, in particular to a battery management system with multiple BMS modules connected in parallel and an implementation method thereof.

Background technique

The battery management system (BMS) is a new energy storage product that was born in this century. Because of the difficulty in controlling the electrochemical reaction and the elusive changes in the performance of materials in this process, it is necessary to have such a housekeeper to supervise and adjust the limit battery pack at all times. Behavior to ensure safe use.

The battery management system (BMS) is a key component of electric vehicles, energy storage power stations, and home energy storage. In order to ensure the safe and reliable operation of the battery, the battery management system needs to have functions such as battery status monitoring and evaluation, charge and discharge control, and battery equalization. Since 2013, fire accidents of electric vehicles, especially pure electric vehicles, have occurred frequently, causing consumers to have safety doubts about electric vehicles. Compared with hybrid electric vehicles (HEV), the battery system structures of plug-in hybrid electric vehicles (PHEV) and battery electric vehicles (BEV) are more complex, and have higher requirements for battery life and safety, and must be equipped with more mature and reliable battery management system. Therefore, the battery management system industry will benefit from the expansion of the electric vehicle market and the development of home energy storage. The main functions of the battery management system are: 1. Detection and correction of the measurement accuracy of the battery management system, mainly including voltage measurement accuracy, current measurement accuracy, temperature detection accuracy, and single voltage measurement accuracy. 2. The safety protection function test of the battery management system is to verify the reliability and sensitivity of the protection action of the battery management system. 3. Battery charge and discharge function test. 4. Algorithm verification of the battery management system: verify the SCO estimation accuracy.

However, with the expansion of the electric vehicle market and the development of household energy storage, there are many types of energy storage products with different demands. Application is not flexible. Generally, the maximum power consumption of a battery management system is fixed; the same battery management system may only be used for one energy storage system, if the actual power used is greater than the power of the current battery management system, the battery The management system cannot provide enough energy to feed. Conversely, if the actual power consumption is much smaller than the power of the battery management system, resources will be wasted, and redesign and development will be required to increase development costs.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art, provide a battery management system with multiple BMS modules connected in parallel and its implementation method, and improve the reliability and safety of the battery management system.

The purpose of the present invention is achieved through the following technical solutions:

A method for implementing a battery management system in which multiple BMS modules are connected in parallel, the steps comprising:

S1. Connect multiple BMS modules in parallel, and set any one of the BMS modules as the main module, and the remaining BMS modules as sub-modules;

S2. The sub-module sends its own module data to the main module, and the main module receives the data of each sub-module, and processes the data of its own module and the data of the sub-modules.

As a further preferred solution, the steps of setting any one of the BMS modules in the step S1 as the main module, and the remaining BMS modules as sub-modules are specifically:

Use the ID setting unit of the BMS module to assign addresses to its own BMS modules, set one of the BMS modules as the main module, and set the other BMS modules as sub-modules.

As a further preferred solution, the steps of setting any one of the BMS modules in the step S1 as the main module, and the remaining BMS modules as sub-modules are specifically:

The upper computer sends the corresponding address to each BMS module through the CAN bus, and one of the BMS modules is set as the main module, and the other BMS modules are set as sub-modules.

As a further preferred solution, the data of the main module and the submodule include: voltage data, current data and warning and protection information.

As a further preferred solution, in the step S2, the step of processing the data of the main module and the sub-modules by the main module includes: calculating voltage data by using an average algorithm, calculating current data by using an addition algorithm, and analyzing warning and protection information by using an OR algorithm.

As a further preferred scheme, the following steps are also included:

The main module sends the data of the main module and the submodule to the load through the CAN bus;

The load controls the charging and discharging of the main module and sub-modules through the CAN bus.

As a further preferred solution, it also includes the step of starting the main module protection program:

If the main module detects that the main module and/or sub-modules have data or information missing, the main module closes its own data output, and sends alarm protection information to each sub-module through the CAN bus, after each sub-module receives the alarm protection information , each sub-module immediately closes its own data output, and the main module and sub-module enter the standby state respectively.

As a further preferred solution, the step of starting the submodule protection program is also included:

If there is a lack of data or information inside the sub-module, the sub-module closes its own data output, and sends alarm protection information to the main module through the CAN bus. After the main module receives the alarm protection information, the main module closes its own data output and sends The alarm protection information is sent to the remaining sub-modules. After the remaining sub-modules receive the alarm protection information, the remaining sub-modules immediately close their own data output, and the main module and the sub-modules enter the standby state respectively.

As a further preferred scheme, the following steps are also included:

After the main module closes its own data output, it sends alarm protection information to the load through the CAN bus, and the load stops charging and discharging the main module and sub-modules after receiving the alarm protection information.

A battery management system with multiple BMS modules connected in parallel includes: a plurality of BMS modules connected in parallel; the BMS module includes a CAN communication unit, the CAN communication unit is connected to a load through a CAN bus, and the CAN communication of a plurality of the BMS modules The units are connected through a CAN bus; the BMS module also includes an ID setting unit, and the ID setting unit is used to set the address of its corresponding BMS module.

Advantages and beneficial effects of the present invention compared to prior art are as follows:

1. The present invention provides a method for realizing a battery management system in which multiple BMS modules are connected in parallel. Multiple BMS modules are provided with a main module and a sub-module. Battery management system reliability.

2. The present invention adopts the average value algorithm, the addition algorithm and the OR gate algorithm in the data processing, which can effectively process the data of each module in real time, and improve the data processing capability and efficiency; meanwhile, the main module also monitors the data of each BMS module in real time If there is any data or information missing, the work of each BMS module can be stopped immediately to improve the safety of the battery management system.

3. In the battery management system with multiple BMS modules connected in parallel provided by the present invention, after multiple BMS modules are connected in parallel, multiple BMS modules can be used in parallel by setting the address, which greatly shortens the development cycle, and the problems that occur in user use Reduced production costs, and at the same time, can meet the application requirements of different end customers in practical applications.

4. The battery management system with multiple BMS modules connected in parallel provided by the present invention is easy to install. Only two power lines and two data lines are needed to form a battery system management system with multiple BMSs connected in parallel. It is easy to use and the battery management system is reliable. high.

Description of drawings

Fig. 1 is a flowchart of a method for implementing a battery management system with multiple BMS modules connected in parallel in the present invention;

Fig. 2 is a structural block diagram of a battery management system in which multiple BMS modules are connected in parallel according to the present invention;

FIG. 3 is another structural block diagram of a battery management system in which multiple BMS modules are connected in parallel according to the present invention.

detailed description

In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of illustration only and are not intended to represent the only embodiments.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terminology used herein in the description of the present invention is only for the purpose of describing specific embodiments, and is not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Example 1

Please refer to Figure 1, a method 20 for implementing a battery management system with multiple BMS modules connected in parallel, the steps include:

S1. Connect multiple BMS modules in parallel, and set any one of the BMS modules as the main module, and the remaining BMS modules as sub-modules;

S2. The sub-module sends its own module data to the main module, and the main module receives the data of each sub-module, and processes the data of its own module and the data of the sub-modules.

In this embodiment, the steps of setting any one of the BMS modules in the step S1 as the main module, and the remaining BMS modules as sub-modules are specifically:

Use the ID setting unit of the BMS module to assign addresses to its own BMS modules, set one of the BMS modules as the main module, and set the other BMS modules as sub-modules.

The ID setting unit is specifically a multi-way dialer, and the multi-way dialer can set the main module and the sub-module through the address.

Take the parallel connection of three BMS modules as an example: set the ID of one of the BMS modules to 000, and this BMS module is the main module, responsible for receiving the data of each sub-module, and processing the data of the main module and each sub-module. The remaining two BMS modules are set as sub-modules, the IDs of each sub-module are ID=100 and ID=101, and each sub-module is responsible for sending its own data to the main module.

The data of the main module and the submodule include: voltage data, current data and warning and protection information. In the step S2, the step of the main module processing the data of the main module and the sub-module includes: calculating the voltage data by using the mean value algorithm, calculating the current data by using the addition algorithm, and analyzing the warning and protection information by using the OR gate algorithm.

The average value algorithm adopted by the voltage data: refers to the voltage sum (U1+U2+...UN) of all BMS modules divided by the number of modules N, that is, the average value of all parallel BMS modules: U=(U1+U2+. ....UN)/N. The addition algorithm of the current data: refers to the current sum (I1+I2+.....IN) of all parallel BMS modules, namely: I=(I1+I2+.....IN). The OR algorithm used in the warning information: simply speaking, when a module is alarmed and protected, the entire system will alarm and protect.

The implementation method 20 of the battery management system with multiple BMS modules connected in parallel also includes the following steps:

The main module sends the data of the main module and the submodule to the load through the CAN bus;

The load controls the charging and discharging of the main module and sub-modules through the CAN bus.

The implementation method 20 of the battery management system with multiple BMS modules connected in parallel also includes the step of starting the main module protection program: if the main module detects that there is data or information missing in the main module and/or sub-modules, the main module closes its own data output , and send alarm protection information to each sub-module through the CAN bus. After each sub-module receives the alarm protection information, each sub-module immediately closes its own data output, and the main module and sub-module enter the standby state respectively. After the main module closes its own data output, it sends alarm protection information to the load through the CAN bus. After the load receives the alarm protection information, the load stops charging or discharging the main module and the sub-module.

The implementation method 20 of the battery management system with multiple BMS modules connected in parallel also includes the step of starting the sub-module protection program: if at least one sub-module is missing data or information, the sub-module with data or information missing closes its own data output, and passes CAN The bus sends alarm protection information to the main module. After the main module receives the alarm protection information, the main module closes its own data output and sends alarm protection information to the rest of the sub-modules. The rest of the sub-modules immediately close their own data after receiving the alarm protection information. output, the main module and the submodule enter the standby state respectively. After the main module closes its own data output, it sends alarm protection information to the load through the CAN bus. After the load receives the alarm protection information, the load stops charging or discharging the main module and the sub-module.

The lack of data or information here means that if a BMS module of the battery management system is disconnected due to a hardware failure, the communication information of the module cannot be received through CAN communication, which is called information loss.

It should be noted that: the load root alarm protection signal type takes corresponding actions: for example, when receiving an undervoltage alarm protection signal, the load will cut off the electrical equipment; when an overcharge and overvoltage alarm protection signal occurs, the load will turn off the charging power supply, Stop charging to the BMS; when a discharge overcurrent alarm protection signal occurs, it will cut off the electrical equipment to prevent the system from over-discharging; when a charging overcurrent alarm protection signal occurs, it will cut off the charging power supply to prevent the system from overcharging.

Example 2

Except for the following technical features, the other technical features of this embodiment are the same as those of Embodiment 1. In the step S1, any one of the BMS modules is set as the main module, and the rest of the BMS modules are sub-modules. The bus sends corresponding addresses to each BMS module, and one of the BMS modules is set as the main module, and the other BMS modules are set as sub-modules.

Take the parallel connection of three BMS modules as an example: the host computer sets the address of one of the BMS modules to ID=000, and sets this BMS module as the main module, which is responsible for receiving the data of each sub-module and controlling the data of the main module and each sub-module. The data is processed. The remaining two BMS modules are set as sub-modules, and the IDs of the two sub-modules are 100 and 101 respectively, and each sub-module is responsible for sending its own data to the main module.

Example 3

Please refer to FIG. 2 , a battery management system 10 in which multiple BMS modules are connected in parallel includes: multiple BMS modules are connected in parallel, the BMS modules include a positive output 1 and a negative output 2, and the positive outputs 1 of the multiple BMS modules are connected in sequence , the negative outputs 2 of multiple BMS modules are connected in sequence. The positive output 1 and the negative output 2 are also externally connected with loads.

The BMS module also includes a CAN communication unit 3, the CAN communication unit 3 is connected to the load through the CAN bus, and the CAN communication units 3 of a plurality of the BMS modules are sequentially connected through the CAN bus; the BMS module also includes an ID setting A unit 4, the ID setting unit 4 is used to set the address of the BMS module. The load controls the charging and discharging of each BMS module.

The battery management system with multiple BSM modules connected in parallel can flexibly control the power of the BMS system used, without re-developing a new BMS system or replacing the BMS project, modularizing complex application systems, saving resources, and reducing The development cost of BMS system.

Example 4

Please refer to Figure 3, except for the following technical features, other technical features of this embodiment are the same as those of Embodiment 3, the CAN communication unit 3 is also connected to the host computer through the CAN bus, and the host computer can be set according to the address of the BMS module. One BMS module is the main module, and the other BMS modules are sub-modules, and the load controls the charging and discharging of each BMS module.

Specifically, the upper computer sends addresses to each BMS module through the CAN bus, and sets the address of one of the BMS modules to ID=000, and sets this BMS module as the master module, and sets the addresses of the remaining BMS modules to ID=001, ID=000 002, ... set these BMS modules as sub-modules, the main module with ID=000 accepts the data of each sub-module, and processes the data of the main module and sub-modules; and the rest of the sub-modules send their own data information to the main module.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (10)

1. a kind of battery management system implementation method of many BMS wired in parallel, it is characterised in that step includes：

S1, by multiple BMS wired in parallel connect, and arrange wherein any one BMS module be primary module, remaining BMS module For submodule；

, by own module data is activation to primary module, the primary module receives the data of each submodule, and right for S2, the submodule The data of own module data and submodule are processed.

2. the battery management system implementation method of many BMS wired in parallel according to claim 1, it is characterised in that described Step S1 arrange wherein any one BMS module be primary module, remaining BMS module be submodule the step of be specially：

Enter row address distribution to its own BMS module using the ID setup units of BMS modules, one of BMS modules are arranged For primary module, remaining BMS module is set to submodule.

3. the battery management system implementation method of many BMS wired in parallel according to claim 1, it is characterised in that described Step S1 arrange wherein any one BMS module be primary module, remaining BMS module be submodule the step of be specially：

Host computer sends corresponding address to each BMS modules by CAN, and one of BMS modules are set to primary module, Remaining BMS module is set to submodule.

4. the battery management system implementation method of many BMS wired in parallel according to claim 1, it is characterised in that described The data of primary module and submodule include：Voltage data, current data and warning protection information.

5. the battery management system implementation method of many BMS wired in parallel according to claim 4, it is characterised in that described In step S2, include the step of the data of master module processes primary module and submodule：Calculate voltage data, adopt using mean algorithm Protection information is alerted with addition algorithm calculating current data, using OR gate Algorithm Analysis.

6. the battery management system implementation method of many BMS wired in parallel according to claim 1, it is characterised in that also wrap Include following steps：

The primary module sends the data of primary module and submodule to load by CAN；

Load the discharge and recharge for controlling primary module and submodule by CAN.

7. the battery management system implementation method of many BMS wired in parallel according to claim 1, it is characterised in that also wrap The step of including startup primary module defence program：

If the primary module detects primary module and/or when submodule has data or loss of learning, primary module closes its data Output, and each submodule is given by CAN transmission alarm and protection information, each submodule receives alarm and protection information Afterwards, each submodule closes its data output immediately, and primary module and submodule respectively enter holding state.

8. the battery management system implementation method of many BMS wired in parallel according to claim 1, it is characterised in that also wrap The step of including promoter module protection program：

If occur data or loss of learning inside the submodule, submodule closes its data output, and passes through CAN Alarm and protection information is sent to primary module, after primary module receives alarm and protection information, primary module closes its data output, and Send alarm and protection information and give remaining submodule, after remaining submodule receives alarm and protection information, remaining submodule Its data output is closed immediately, and primary module and submodule respectively enter holding state.

9. the battery management system implementation method of many BMS wired in parallel according to claim 7 or 8, it is characterised in that also Comprise the following steps：

After the primary module closes itself output, alarm and protection information is sent to load by CAN, the load-receipt is arrived After alarm and protection information, load stops the discharge and recharge to primary module and submodule.

10. a kind of battery management system of many BMS wired in parallel, it is characterised in that include：Multiple BMS modules being connected in parallel； The BMS modules include CAN communication unit, and the CAN communication unit is connected with load by CAN, multiple BMS moulds The CAN communication unit of block is connected by CAN；The BMS modules also include ID setup units, and the ID setup units are used for Set the address of its correspondence BMS module.