阅读说明：本技术 一种锂电池组智能监控系统及方法 (Intelligent monitoring system and method for lithium battery pack ) 是由 严春 许靓 于 2021-05-27 设计创作，主要内容包括：本发明公开了一种锂电池组智能监控系统及方法,锂电池组智能监控系统包括电池模组,包括多个通过串并联组合连接且呈矩阵式排列的电池组,并根据电池组的数量及串并联组合连接关系形成系统条形码,所述电池组包括多个串联连接的锂电池；多个监控模块,所述监控模块包括微控制器、均与微控制器电性连接的采样模块、功率管控制模块、通讯接口、检测模块和编码识别模块,且用于监控每个电池组的电池状态、电池容量和电池温度,所述微控制器通过通讯接口连接有无线传输模块。本发明可实现电池模组的标准化设计,并通过系统条形码和编码对每个电池组进行监控显示,实时监控电池组的容量、电压和健康状况,监控数据直观且便于故障时进行维修、更换。(The invention discloses an intelligent monitoring system and method for a lithium battery pack, wherein the intelligent monitoring system for the lithium battery pack comprises a battery module, a plurality of battery packs and a plurality of intelligent monitoring modules, wherein the battery packs are connected in series-parallel combination and arranged in a matrix form; a plurality of monitoring modules, monitoring module include microcontroller, all with microcontroller electric connection's sampling module, power tube control module, communication interface, detection module and code identification module, and be used for the battery state of every group battery of control, battery capacity and battery temperature, microcontroller has wireless transmission module through communication interface connection. The invention can realize the standardized design of the battery module, monitor and display each battery pack through the system bar code and the code, monitor the capacity, the voltage and the health condition of the battery pack in real time, monitor data visually and facilitate the maintenance and the replacement when in failure.)

1. The utility model provides a lithium cell group intelligent monitoring system which characterized in that: the method comprises the following steps:

the battery module comprises a plurality of battery packs which are connected in series-parallel combination and arranged in a matrix form, and a system bar code is formed according to the number of the battery packs and the series-parallel combination connection relation, wherein each battery pack comprises a plurality of lithium batteries connected in series;

the monitoring module comprises a microcontroller, a sampling module, a power tube control module, a communication interface, a detection module and a coding identification module, wherein the sampling module, the power tube control module, the communication interface, the detection module and the coding identification module are all electrically connected with the microcontroller and are used for monitoring the battery state, the battery capacity and the battery temperature of each battery pack;

and the display terminal is used for calculating and displaying the real-time monitoring data of the monitoring module, tracking and positioning the battery module to realize the anti-theft function, and is electrically connected with the monitoring module through the wireless transmission module.

2. The intelligent monitoring system for the lithium battery pack as claimed in claim 1, wherein: the sampling module includes the processing unit, with processing unit electric connection's voltage sampling unit, battery temperature sampling unit and electric current sampling unit, the positive pole and the negative pole of every section lithium cell are connected to the voltage sampling unit, the lithium cell is connected to battery temperature sampling unit, the negative pole and the other end connection power tube control module of group battery are connected to electric current sampling unit one end.

3. The intelligent monitoring system for the lithium battery pack according to claim 2, is characterized in that: the battery temperature sampling unit adopts negative temperature coefficient resistance NTC, and the current sampling unit adopts current sampling resistance.

4. The intelligent monitoring system for the lithium battery pack as claimed in claim 1, wherein: the power tube control module comprises a power tube control unit and a MOSFET tube group, the power tube control unit is electrically connected with the microcontroller, a grid electrode of the MOSFET tube group is connected with the power tube control unit, and a drain electrode or a source electrode of the MOSFET tube group is connected with a negative electrode of the current sampling unit or the control panel and is used for controlling charging and discharging of the battery pack according to sampling data and detection data of the detection module.

5. The intelligent monitoring system for the lithium battery pack as claimed in claim 1, wherein: the communication interface includes UART communication interface, RS485 communication interface and CAN communication interface, microcontroller still is connected with the LCD display screen, display terminal includes wireless display terminal and wired display terminal, microcontroller connects wireless display terminal through wireless transmission module and is used for system management, or connects wired display terminal through communication interface and is used for system management.

6. The intelligent monitoring system for the lithium battery pack as claimed in claim 5, wherein: the detection module comprises a charging detection circuit, a discharging detection circuit, an overcharging voltage detection circuit, an overdischarging voltage detection circuit, a charging overcurrent detection circuit, a discharging overcurrent detection circuit and a short-circuit protection circuit, is respectively used for detecting the charging state, the discharging state, the overcharging voltage state, the overdischarging voltage state, the charging overcurrent state and the discharging overcurrent state of the battery pack, performs short-circuit protection, and transmits real-time detection data to the display terminal through the LCD display screen or the wireless transmission module to display the real-time detection data.

7. The intelligent monitoring system for the lithium battery pack as claimed in claim 1, wherein: the real-time monitoring data of the display terminal comprises the working state of the battery module, the running speed of the locomotive, the total discharge time, the total voltage value of the battery module, the total current value, the total power value, the total capacity, the highest temperature value of the battery packs, the number of the battery packs, the battery state of each battery pack, the charging completion time, the health condition, the voltage value, the battery capacity and the temperature value.

8. A monitoring method using the intelligent monitoring system for lithium battery pack according to any one of claims 1 to 7, characterized in that: the method comprises the following steps:

s1, generating system bar codes (0A, 0B) according to the number of the battery packs and the series-parallel combination connection relation, wherein A represents the number of the battery packs connected in series, B represents the number of the battery packs connected in parallel, namely, a battery unit is formed after the B battery packs are connected in parallel and used for improving the capacity of the battery unit, then the A battery units are connected in series to form a battery module and used for improving the total voltage value of the battery module, the total number of the battery packs is A and B, namely, the total number of series-parallel combination connection codes of the generated battery packs is A and B;

s2, according to the system bar codes (0A and 0B), the code of the kth battery pack is (0A 0B), wherein a is an integer which is more than 0 and less than or equal to A, B is an integer which is more than 0 and less than or equal to B, k is an integer which is more than 0 and less than or equal to A and B, (0A 0B) represents that the kth battery pack is connected with a parallel connection position No. 0B and a series connection position No. 0A, and the series-parallel combination connection of the battery packs is realized through the series-parallel combination connection of the control boards;

s3, monitoring the temperature of each lithium battery by the sampling module through the battery temperature sampling unit, extracting the highest temperature to represent the working temperature of the battery pack, detecting the voltage value of each lithium battery through the voltage sampling unit, and detecting the current value of the battery pack through the current sampling unit;

and S4, uploading the working temperature value, the current value, the voltage value of each lithium battery, the code of each battery pack and the working state detection data of the battery pack to a microcontroller, transmitting the working temperature value, the current value, the voltage value of each lithium battery, the code of each battery pack and the working state detection data of the battery pack to a display terminal through a wireless transmission module for statistical analysis, displaying the total capacity, the total discharge time, the total voltage, the total current value, the total power value and the maximum temperature value of the battery module obtained through calculation in real time, and simultaneously displaying the battery state, the capacity, the voltage value, the current value, the maximum temperature value, the health assessment condition of the battery pack and the maximum voltage value, the minimum voltage value and the maximum voltage difference value of the lithium batteries in the battery pack according to the code of each battery pack.

Technical Field

The invention relates to the technical field of lithium battery monitoring, in particular to an intelligent monitoring system and method for a lithium battery pack.

Background

When the lead-acid battery is used, the lead-acid battery is connected in series to form a battery module, and has the defects of small energy density, short service life, heavy metal pollution, fussy maintenance, memory effect, small discharge depth and the like, and the lithium battery is a battery which uses lithium metal or lithium alloy as a positive/negative electrode material and uses a non-aqueous electrolyte solution. The lithium battery gradually replaces a lead-acid battery by the characteristics of high storage energy density, long service life, extremely low self-discharge rate, environmental protection and the like, is manufactured into a level and is widely applied to a plurality of fields of electric tools, electric bicycles, electric motorcycles, electric automobiles and the like.

In the prior art, a plurality of lithium batteries are connected in series-parallel combination to form a complete battery module, and in order to prolong the service life of the battery module, a matched battery management system is required to be used for monitoring and managing the battery module. The patent with publication number CN111541287A discloses a battery management system and a control method for an energy storage type lithium battery pack, which monitor the input end current, the output end current, the charging and discharging current, the battery life, the battery temperature, the charging current and the discharging current of the system through a battery management unit, and control a charging relay to realize the on-off of a charging loop through collecting data. However, due to the fact that the number of the battery packs is large and the connection relationship is complex, the battery management system of the energy storage type lithium battery pack cannot clearly show the connection relationship among the battery packs, and monitoring, overhauling and replacement of a single battery pack are inconvenient.

Disclosure of Invention

In order to solve the problems, the invention provides an intelligent monitoring system and method for a lithium battery pack, which are used for realizing the standardized design of a battery module, monitoring and displaying each battery pack through a system bar code and a code, monitoring the capacity, the voltage and the health condition of the battery pack in real time, monitoring data intuitively and facilitating the maintenance and replacement of the battery pack when the battery pack breaks down.

The technical scheme adopted by the invention is as follows:

the application provides a lithium cell group intelligent monitoring system, includes:

the battery module comprises a plurality of battery packs which are connected in series-parallel combination and arranged in a matrix form, and a system bar code is formed according to the number of the battery packs and the series-parallel combination connection relation, wherein each battery pack comprises a plurality of lithium batteries connected in series;

the monitoring module comprises a microcontroller, a sampling module, a power tube control module, a communication interface, a detection module and a coding identification module, wherein the sampling module, the power tube control module, the communication interface, the detection module and the coding identification module are all electrically connected with the microcontroller and are used for monitoring the battery state, the battery capacity and the battery temperature of each battery pack;

and the display terminal is used for calculating and displaying the real-time monitoring data of the monitoring module, tracking and positioning the battery module to realize the anti-theft function, and is electrically connected with the monitoring module through the wireless transmission module.

Preferentially, the sampling module includes the processing unit, with processing unit electric connection's voltage sampling unit, battery temperature sampling unit and current sampling unit, the positive pole and the negative pole of every section lithium cell are connected to the voltage sampling unit, the lithium cell is connected to battery temperature sampling unit, power tube control module is connected to the negative pole and the other end of group battery are connected to current sampling unit one end.

Preferably, the battery temperature sampling unit adopts a negative temperature coefficient resistor NTC, and the current sampling unit adopts a current sampling resistor.

Preferably, the power management and control module includes a power tube control unit and a MOSFET tube set, the power tube control unit is electrically connected to the microcontroller, the gate of the MOSFET tube set is connected to the power tube control unit, and the drain or source of the MOSFET tube set is connected to the negative electrode of the current sampling unit or the control board and is used for controlling the charging and discharging of the battery pack according to the sampling data and the detection data of the detection module.

Preferentially, the communication interface includes UART communication interface, RS485 communication interface and CAN communication interface, microcontroller still is connected with the LCD display screen, display terminal includes wireless display terminal and wired display terminal, microcontroller connects wireless display terminal through wireless transmission module and is used for system management, or connects wired display terminal through communication interface and is used for system management.

Preferably, the detection module includes a charging detection circuit, a discharging detection circuit, an overcharging voltage detection circuit, an overdischarging voltage detection circuit, a charging overcurrent detection circuit and a discharging overcurrent detection circuit, and is respectively used for detecting a charging state, a discharging state, an overcharging voltage state, an overdischarging voltage state, a charging overcurrent state and a discharging overcurrent state of the battery pack, and transmitting the real-time detection data to the display terminal through the LCD display screen or the wireless transmission module to display the real-time detection data.

Preferably, the real-time monitoring data of the display terminal includes a battery module working state, a locomotive running speed, a total discharge time, a battery module total voltage value, a total current value, a total power value, a total capacity, a maximum temperature value of the battery pack, a number of the battery packs, a battery state of each battery pack, a charge completion time, a health condition, a voltage value, a battery capacity and a temperature value.

Based on the intelligent monitoring system for the lithium battery pack, the application also provides a monitoring method using the intelligent monitoring system for the lithium battery pack, which comprises the following steps:

s1, generating system bar codes (0A, 0B) according to the number of the battery packs and the series-parallel combination connection relation, wherein A represents the number of the battery packs connected in series, B represents the number of the battery packs connected in parallel, namely, a battery unit is formed after the B battery packs are connected in parallel and used for improving the capacity of the battery unit, then the A battery units are connected in series to form a battery module and used for improving the total voltage value of the battery module, the total number of the battery packs is A and B, namely, the total number of series-parallel combination connection codes of the generated battery packs is A and B;

s2, according to the system bar codes (0A and 0B), the code of the kth battery pack is (0A 0B), wherein a is an integer which is more than 0 and less than or equal to A, B is an integer which is more than 0 and less than or equal to B, k is an integer which is more than 0 and less than or equal to A and B, (0A 0B) represents that the kth battery pack is connected with a parallel connection position No. 0B and a series connection position No. 0A, and the series-parallel combination connection of the battery packs is realized through the series-parallel combination connection of the control boards;

s3, monitoring the temperature of each lithium battery by the sampling module through the battery temperature sampling unit, extracting the highest temperature to represent the working temperature of the battery pack, detecting the voltage value of each lithium battery through the voltage sampling unit, and detecting the current value of the battery pack through the current sampling unit;

and S4, uploading the working temperature value, the current value, the voltage value of each lithium battery, the code of each battery pack and the working state detection data of the battery pack to a microcontroller, transmitting the working temperature value, the current value, the voltage value of each lithium battery, the code of each battery pack and the working state detection data of the battery pack to a display terminal through a wireless transmission module for statistical analysis, displaying the total capacity, the total discharge time, the total voltage, the total current value, the total power value and the maximum temperature value of the battery module obtained through calculation in real time, and simultaneously displaying the battery state, the capacity, the voltage value, the current value, the maximum temperature value, the health assessment condition of the battery pack and the maximum voltage value, the minimum voltage value and the maximum voltage difference value of the lithium batteries in the battery pack according to the code of each battery pack.

The invention has the beneficial effects that:

1. the number and the series-parallel relation of the battery packs in the battery module are represented by the system bar code, the series-parallel relation of each battery pack is represented by a code and is used as an identification code of the battery pack, so that each battery pack is conveniently and independently monitored, the battery packs are overhauled and replaced when the battery module breaks down, and the efficiency is improved;

2. through the independent monitoring of single group battery, the statistical analysis of whole battery module is carried out to the display terminal of being convenient for, improves the real-time of control.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic connection diagram of the present invention;

fig. 2 is a schematic view of the arrangement of the battery pack of the present invention;

fig. 3 is a schematic diagram of the battery pack encoding of the present invention.

Detailed Description

Example one

As shown in fig. 1, the present application provides an intelligent monitoring system for a lithium battery pack, including:

the battery module comprises a plurality of battery packs which are connected in series-parallel combination and arranged in a matrix form, and system bar codes are formed according to the number of the battery packs and the series-parallel combination connection relation, wherein each battery pack comprises a plurality of lithium batteries connected in series.

A plurality of monitoring module, monitoring module includes microcontroller, all with microcontroller electric connection's sampling module, power tube control module, communication interface, detection module and code identification module, and be used for monitoring the battery state of every group battery, battery capacity and battery temperature, microcontroller has wireless transmission module through communication interface connection, code identification module is used for expressing the series connection position and the parallel connection position that every group battery is connected through the code, and transmit to microcontroller, code identification module includes coding unit and control panel, the series-parallel combined connection of group battery is realized to the series-parallel combined connection through the series-parallel combined connection of control panel, a total voltage and the battery capacity for changing the battery module.

And the display terminal is used for calculating and displaying the real-time monitoring data of the monitoring module, tracking and positioning the battery module to realize the anti-theft function, and is electrically connected with the monitoring module through the wireless transmission module.

As shown in fig. 1 to 3, based on the above-mentioned intelligent monitoring system for lithium battery pack, the present application also provides a monitoring method using the above-mentioned intelligent monitoring system for lithium battery pack, which includes the following steps:

s1, generating system bar codes of (0A, 0B) according to the number of the battery packs and the series-parallel combination connection relation, wherein A represents the number of the battery packs connected in series, B represents the number of the battery packs connected in parallel, namely, after the B battery packs are connected in parallel, a battery unit is formed and used for improving the capacity of the battery unit, then the A battery units are connected in series to form a battery module and used for improving the total voltage value of the battery module, the total number of the battery packs is A and B, namely, the total number of series-parallel combination connection codes of the generated battery packs is A and B.

And S2, according to the system bar codes (0A and 0B), the code of the kth battery pack is (0A 0B), wherein a is an integer which is more than 0 and less than or equal to A, B is an integer which is more than 0 and less than or equal to B, k is an integer which is more than 0 and less than or equal to A and B, and (0A 0B) represents that the kth battery pack is connected with a parallel connection bit of No. 0B and a series connection bit of No. 0A, and the series-parallel combination connection of the battery packs is realized through the series-parallel combination connection of the control boards.

As shown in fig. 2 to 3, the capacity of the battery module is selected according to the driving distance of the electric vehicle, and further, the number of battery packs and the series-parallel relationship are selected. Assuming that the voltage of each battery pack is 12.0V, the capacity is 10Ah, the system bar code of the battery module is (04, 04), it indicates that 4 battery packs are connected in parallel to form one battery unit, the voltage of the battery unit is 12V, the capacity is 40Ah, the 4 battery units are connected in series to form a complete battery module, the voltage of the battery module is 48V, the capacity is 40Ah, and the number of the battery packs is 16, that is, 16 different codes exist, and the codes are shown in fig. 2.

Wherein each row represents 4 battery packs in the same battery cell connected in parallel and 4 columns represent 4 battery cells connected in series. Four parallel positions and 1 series position are arranged in each battery unit, and the serial number of the series positions is the same as that of the battery units. (0101) Indicating that the battery pack is connected with the parallel bit number 01 and the series bit number 01 in the first battery unit, and being used as the code of the battery pack, (0102) indicating that the battery pack is connected with the parallel bit number 02 and the series bit number 01 in the first battery unit, and so on, (0404) indicating that the battery pack is connected with the parallel bit number 04 and the series bit number 04 in the fourth battery unit.

S3, monitoring the temperature of each lithium battery by the sampling module through the battery temperature sampling unit, extracting the highest temperature to represent the working temperature of the battery pack, detecting the voltage value of each lithium battery through the voltage sampling unit, and detecting the current value of the battery pack through the current sampling unit;

s4, uploading the working temperature value, the current value, the voltage value of each lithium battery, the code of each battery pack and the working state detection data of the battery pack to a microcontroller, transmitting the working temperature value, the current value, the voltage value of each lithium battery, the code of each battery pack and the working state detection data of the battery pack to a display terminal for statistical analysis through a wireless transmission module, connecting the battery capacities in parallel during calculation, connecting the expanded voltage values in series, displaying the total capacity, the total discharge time, the total voltage, the total current value, the total power value and the highest temperature value of the battery module obtained by calculation in real time by the display terminal, simultaneously displaying the battery state, the capacity, the voltage value, the current value, the highest temperature value, the health assessment condition of the battery pack and the highest voltage value, the lowest voltage value and the maximum voltage value of the lithium batteries in the battery pack according to the code of each battery pack, playing roles of monitoring and protection, and facilitating the user to select parameters in a certain range, such as the capacity, the voltage value and the current value of the battery pack, and the like, so that the user experience is improved.

Example two

As shown in fig. 1, the present embodiment is different from the second embodiment in that: the sampling module comprises a processing unit, a voltage sampling unit, a battery temperature sampling unit and a current sampling unit, wherein the voltage sampling unit is electrically connected with the processing unit, the voltage sampling unit is connected with the anode and the cathode of each lithium battery, the battery temperature sampling unit is connected with the lithium batteries, and one end of the current sampling unit is connected with the cathode of the battery pack and the other end of the current sampling unit is connected with the power tube control module.

As shown in fig. 1, the power transistor control module includes a power transistor control unit and a MOSFET tube set, the power transistor control unit is electrically connected to the microcontroller, a gate of the MOSFET tube set is connected to the power transistor control unit, and a drain or a source of the MOSFET tube set is connected to the current sampling unit or a negative electrode of the control board, and is configured to control charging and discharging of the battery pack according to the sampling data and the detection data of the detection module. If when charging, under the excessive pressure, overcurrent or high temperature state, microcontroller passes through power tube control unit control MOSFET of charging of MOSFET nest of tubes and cuts off, stops charging, plays the guard action to the group battery, improves life.

As shown in fig. 1, the communication interface includes a UART communication interface, an RS485 communication interface and a CAN communication interface, satisfy the wireless transmission module of different interfaces, the display terminal includes a wireless display terminal and a wired display terminal, the wireless display terminal includes a mobile phone, a tablet computer, a smart television, etc., the wired display terminal includes a PC, the microcontroller connects the wireless display terminal through the wireless transmission module and is used for system management, or connects the wired display terminal through the communication interface and is used for system management, it is convenient to select a proper communication interface and system management mechanism according to actual conditions. The microcontroller is also connected with an LCD display screen, and data can be visually displayed.

As shown in fig. 1, the real-time monitoring data of the display terminal includes a battery module operating state, a locomotive running speed, a total discharge time, a total battery module voltage value, a total current value, a total power value, a total capacity, a maximum temperature value of the battery packs, the number of the battery packs, a battery state of each battery pack, a charge completion time, a health condition, a voltage value, a battery capacity, and a temperature value.

EXAMPLE III

As shown in fig. 1, the present embodiment is different from the third embodiment in that: the battery temperature sampling unit adopts a negative temperature coefficient resistor NTC, and the current sampling unit adopts a current sampling resistor, so that the cost is reduced on the basis of realizing the same function.

As shown in fig. 1, the detection module includes a charging detection circuit, a discharging detection circuit, an overcharging voltage detection circuit, an overdischarging voltage detection circuit, a charging overcurrent detection circuit and a discharging overcurrent detection circuit, and is respectively used for detecting a charging state, a discharging state, an overcharging voltage state, an overdischarging voltage state, a charging overcurrent state and a discharging overcurrent state of the battery pack, and transmitting real-time detection data to a display terminal through an LCD display screen or a wireless transmission module, and the microcontroller performs early warning in time through detection data.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.