CN115817272A - Battery management system, electric quantity monitoring method and device thereof, and new energy automobile - Google Patents

Abstract

The application relates to the technical field of new energy automobiles, and discloses a battery management system, an electric quantity monitoring method and device thereof, and a new energy automobile. The battery management system is additionally provided with the current detection device in the existing battery management system to detect the power supply current of the analog front end and monitor the electric quantity of the analog front end under the condition that the power supply current meets the preset condition, so that the power consumption abnormity caused by the power supply current of the analog front end can be avoided, and the safety of the new energy automobile is improved.

Description

Battery management system and its power monitoring method, device, new energy vehicle

technical field

The present application relates to the technical field of new energy vehicles, for example, to a battery management system and its power monitoring method, device, and new energy vehicles.

Background technique

BMS (Battery management system, battery management system) is a vital component in new energy vehicles. It can ensure the safe, reliable and efficient use of the battery during its life cycle. The main function of BMS is to detect that the voltage, current, temperature, capacity, and even other environmental parameters of the battery are within the safe range during charging and discharging, so as to ensure the safety of the battery, and then improve the service life and efficiency.

In the BMS of new energy vehicles, AFE (analog front end, analog front end) is the battery sampling chip, which is used to collect parameters such as cell voltage and temperature. When the existing BMS estimates or monitors the power consumption of the power battery pack, it often considers the power consumption of the power battery pack and whether the power consumption of the power battery pack is abnormal. However, the actual operation of new energy vehicles At the same time, other devices including AFE also consume power, and the power consumption of these other devices is easy to be ignored.

It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the application, and therefore may include information that does not constitute prior art known to those of ordinary skill in the art.

Contents of the invention

In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is presented below. The summary is not intended to be an extensive overview nor to identify key/important elements or to delineate the scope of these embodiments, but rather serves as a prelude to the detailed description that follows.

Embodiments of the present application provide a battery management system and its power monitoring method, device, and new energy vehicle, so as to improve battery safety.

In some embodiments, the battery management system includes: a plurality of battery modules connected in series, each battery module includes a battery or a plurality of batteries connected in series, and the battery module is configured as the new energy source Vehicle power supply; multiple analog front ends, one end of each analog front end is connected to one or more battery modules through a current detection device, and the analog front end is configured to send the supply current of the analog front end detected by the current detection device ; The controller is communicatively connected with all the analog front ends, the controller is configured to receive the supply current sent by the analog front ends, and when the supply current of the analog front ends satisfies a predetermined condition, according to the supply current to the The analog front end performs power monitoring.

Optionally, the current detection device is a resistor.

Optionally, it also includes: an anti-reverse diode disposed between the analog front end and the battery module.

Optionally, it also includes: a MOS transistor disposed between the analog front end and the battery module, the MOS transistor is configured to disconnect the analog front end when the current of the analog front end is greater than a threshold connection with the battery module.

Optionally, the MOS transistor is a PMOS transistor.

In some embodiments, the method is applied to a battery management system, and the battery management system includes a plurality of battery modules connected in series, and each battery module includes one battery or a plurality of batteries connected in series, each of which The battery module is connected to an analog front-end, and the method includes: obtaining the supply current of the analog front-end; when the supply current of the analog front-end satisfies a predetermined condition, performing power monitoring according to the supply current of the analog front-end .

In some embodiments, the device is applied to the battery management system, the battery management system includes a plurality of battery modules, each battery module includes a battery or a plurality of batteries connected in series, each of the The battery module is connected to an analog front-end, and the device includes: an acquisition module configured to acquire the supply current of the analog front-end; a monitoring module configured to, when the supply current of the analog front-end satisfies a predetermined condition, Power monitoring is performed according to the supply current of the analog front end.

In some embodiments, the new energy vehicle includes: a new energy vehicle body, the above-mentioned battery management system is installed in the new energy vehicle body, or the above-mentioned power monitoring device for the battery management system is installed in the body of the new energy vehicle.

The battery management system and its power monitoring method, device, and new energy vehicle provided in the embodiments of the present application can achieve the following technical effects:

By adding a current detection device to the existing battery management system to detect the supply current of the analog front end, and to monitor the power consumption of the analog front end when the supply current meets the predetermined conditions, the power consumption caused by the supply current of the analog front end itself can be avoided To improve the safety of new energy vehicles.

The foregoing general description and the following description are exemplary and explanatory only and are not intended to limit the application.

Description of drawings

One or more embodiments are exemplified by the corresponding drawings, and these exemplifications and drawings do not constitute a limitation to the embodiments, and elements with the same reference numerals in the drawings are shown as similar elements, The drawings are not limited to scale and in which:

FIG. 1 is a schematic structural diagram of a battery management system in the related art;

FIG. 2 is a schematic structural diagram of a battery management system provided in an embodiment of the present application;

FIG. 3 is a schematic structural diagram of another battery management system provided by an embodiment of the present application;

FIG. 4 is a schematic structural diagram of an analog front-end provided by an embodiment of the present application;

FIG. 5 is a schematic structural diagram of another analog front-end provided by the embodiment of the present application;

FIG. 6 is a flow chart of a method for monitoring electricity in a battery management system provided in an embodiment of the present application;

FIG. 7 is a flow chart of another power monitoring method for a battery management system provided in an embodiment of the present application;

FIG. 8 is a schematic structural diagram of a power monitoring device used in a battery management system provided in an embodiment of the present application;

FIG. 9 is a schematic structural diagram of another power monitoring device used in a battery management system provided in an embodiment of the present application;

Fig. 10 is a schematic diagram of a new energy vehicle provided by the embodiment of the present application.

Detailed ways

In order to understand the characteristics and technical contents of the embodiments of the present application in more detail, the implementation of the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. The attached drawings are only for reference and description, and are not intended to limit the embodiments of the present application. In the following technical description, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawings.

The terms "first" and "second" in the description and claims of the embodiments of the present application and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It should be understood that the data so used may be interchanged under appropriate circumstances so that the embodiments of the present application described herein are embodiments of the embodiments. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion.

Unless stated otherwise, the term "plurality" means two or more.

In the embodiment of the present application, the character "/" indicates that the preceding and following objects are an "or" relationship. For example, A/B means: A or B.

The term "and/or" is an associative relationship describing objects, indicating that there can be three relationships. For example, A and/or B means: A or B, or, A and B, these three relationships.

In the current technical route of BMS, most of the AFE power supply is provided by the module of the power battery. The current BMS only considers the influence of the total current on the SOC of the power battery during charging and discharging when estimating the SOC of the power battery (using the ampere-hour integration method). , without taking into account the power consumption of the AFE itself. Regardless of the charging or discharging phase, the AFE handles the working state, and is powered by the power battery module. Based on the above analysis, the current technical solution has the following problems: 1. The SOC estimation of the power battery is not accurate, which affects the estimation of the cruising range and charging time of the vehicle; 2. The current of the AFE itself is not monitored. If the AFE acquisition circuit power consumption of the BMS Abnormal, if the BMS fails to diagnose in time, it will cause the module battery to be unbalanced, which will seriously affect the cruising range and charging time estimation of the vehicle.

As shown in Fig. 1, it is a schematic structural diagram of a power battery pack of a new energy vehicle. In the prior art, each device of a new energy vehicle is powered by a power battery pack. As shown in Figure 1, all batteries are connected in series, and several series-connected batteries are connected to an AFE chip. These batteries form a battery module BM1. AFE is a chip used to detect battery parameters, such as battery voltage, temperature, etc. The AFEs are connected through a serial communication link. According to the settings of the battery management system of different vehicles, AFE sends the parameters to BMS or ACU.

The power battery is composed of power battery modules BM1~BMn, and each battery module is connected with the analog front-end (AFE) chip of the battery management system (BMS) and related hardware circuits, and is used for all battery cells connected in series in the module and Analog signal detection in the high voltage area of the battery module. Current sensor A1 is used to detect the total current of the power battery in charging or discharging mode, which is also an important basis for BMS to estimate SOC. I_C1 is the current direction during charging, and I_D1 is the current direction during discharging. MSD can be called a maintenance switch, which is used to disconnect the battery link during maintenance to avoid electric shock.

In the embodiment of the present application, the power supply current acquisition device of the AFE chip is added on the basis of the original BMS, and the parameters of the collected current value and module voltage value are referred to the ampere-hour integral of the BMS to realize the correction of the module ampere-hour integral. The real current value of power battery charging or discharging can be calculated through the current detection of AFE's own consumption, so as to improve the accuracy of power battery SOC estimation of new energy vehicles. When the AFE detects that the current value of the power supply exceeds the predetermined threshold, it sends out an alarm signal for the abnormal consumption of the AFE power supply current, which is used for BMS and the whole vehicle to analyze and deal with the fault.

As shown in FIG. 2 , it is a battery management system 200 provided by the embodiment of the present application. The battery management system 200 includes: a battery module 202 , a current detection device 204 , an analog front end 206 and a controller 208 . in:

There are multiple battery modules 202 (202 in FIG. 2 is an exemplary battery module listed), and each battery module 202 in the multiple battery modules includes a plurality of batteries 2021 connected in series, so The battery module 202 is configured to supply power for the new energy vehicle.

There are multiple analog front ends 206 (only one of them is schematically listed in FIG. 2 ), and one end of each analog front end 206 in the plurality of analog front ends 206 is connected to one or more battery modules 202 through the current detection device 204 connected, the analog front end 406 is configured to send the supply current of the analog front end 206 detected by the current detection device 204;

The controller 208 is connected in communication with all the analog front ends 206, and the controller 208 is configured to receive the supply current sent by the analog front ends 206, and when the supply current of the analog front ends 206 satisfies a predetermined condition, according to the The current monitors the power of the analog front end 206 .

The battery management system provided by the embodiment of the present application can avoid The abnormal power consumption caused by the power supply current of the analog front end improves the safety of new energy vehicles.

Optionally, the current detection device is a resistor.

In this way, current detection based on resistance only requires a simple modification of the battery pack in the prior art, which is low in cost and easy to implement.

In the following, combined with the battery management system shown in Figure 3, taking AFE1 power supply current collection as an example to introduce in detail how to simulate the supply current of the front-end AFE, correct the SOC based on the supply current, and monitor the power consumption of the AFE. . As shown in FIG. 3 , a sampling resistor R1 is connected in series between the power supply input pins of the battery module BM1 and AFE1 .

(1) The auxiliary analog acquisition interface of AFE1 measures the voltages before and after R1 as V1 and V2 respectively.

(2) AFE1 sends the collected values of V1 and V2 to the BMS main control unit.

The BMS main control unit is the controller 208 in the above embodiments.

(3) The BMS main control unit uses the following formula to calculate the power supply current collected by each battery module:

I=(V1-V2)/R1

Wherein, I is the current of AFE1 itself, V1 is the supply voltage of the battery module BM1, and I is the supply current of the battery module BM1.

(4) The BMS main control unit calculates the corrected SOC through the following formula:

SOC_module=SOC_calculated value*(1-I_AFE/I_total current)

Wherein, I_AFE is the supply current value of the battery module AFE1; I_total current is the charging and discharging current value of the battery module.

All battery modules constitute the battery pack of the entire new energy vehicle. The above-mentioned charge and discharge current value is the total current value of the battery pack. Since all the batteries in the battery module are connected in series, the total current value of the battery pack is the current value of each battery. current value.

(5) The BMS main control unit sets the reference value Imax of the power supply current of each battery module AFE. When the calculated AFE power supply current value I is greater than Imax, the AFE power supply current abnormal alarm signal is triggered for the VCU to perform alarm processing.

Specifically, the alarm processing is divided into three levels, which are specifically divided as follows:

Level 1: Serious power consumption, stop immediately.

Level 2: Prompt for maintenance.

Level 3: One or more of the following operations can be performed:

Degradation handling, limited speed, recording, instrument display.

It can be understood that the above step (4) and step (5) can be started after the current value of each AFE is calculated, that is, step (4) and step (5) do not need to be performed at the same time, and there is no Restrictions on the order of execution before and after.

As shown in FIG. 4, it is a schematic structural diagram of an analog front-end provided by the embodiment of the present application. On the basis of FIG. Between group 202.

In this way, through the one-way conduction characteristic of the diode, when the current of the analog front-end flows to the battery module in reverse, the analog front-end and the battery module can be disconnected in time to avoid damage to the battery module.

Optionally, the embodiment of the present application also provides a battery management system, which, on the basis of the battery management system 200 shown in FIG. Between the modules 202, the MOS transistor is configured to disconnect the analog front end 206 from the battery module 202 when the current of the analog front end 206 is greater than a threshold.

Optionally, the MOS tube can be installed on the battery management system shown in FIG. 2 or on the battery management system shown in FIG. 3 .

Optionally, the MOS transistor is a PMOS transistor.

FIG. 5 is a schematic structural diagram of an analog front-end including a PMOS transistor provided in an embodiment of the present application. In this way, when the current of the analog front-end is too large, the power supply voltage of the analog front-end can be quickly shut down through the characteristics of the MOS tube itself. Compared with the ACU or BMS through software control, it can eliminate potential safety hazards in a timely and rapid manner, and further improve battery safety. sex.

As shown in FIG. 6 , it is a power monitoring method for a battery management system provided by an embodiment of the present application. The battery management system includes a plurality of battery modules connected in series, and each battery module includes a battery or A plurality of batteries connected in series, each of the battery modules is connected to an analog front end, and the method is applied to a controller in a battery management system, which includes the following steps:

S602: The controller obtains the supply current of the analog front end.

S604: The controller performs power monitoring according to the power supply current of the analog front end when the power supply current of the analog front end satisfies a predetermined condition.

The power monitoring method provided by the embodiment of the present application detects the power supply current of the analog front end, and monitors the power consumption of the analog front end when the power supply current meets the predetermined conditions, which can avoid abnormal power consumption caused by the power supply current of the analog front end itself , Improve the safety of new energy vehicles.

Optionally, the analog front end is connected to the battery through a voltage detection device, and the above step S602 obtaining the supply current of the analog front end includes: obtaining the supply voltage of the analog front end detected by the voltage detection device; according to the The supply voltage of the analog front end determines the supply current of the analog front end.

Optionally, the voltage detection device is a resistor, and the supply current is determined by the following formula:

I=(V1-V2)/R1

Among them, I is the current of AFE itself, V1 is the power supply voltage of the module, and I is the power supply current of the module.

In this way, current detection based on resistance only requires a simple modification of the battery pack in the prior art, which is low in cost and easy to implement.

As shown in FIG. 7, another power monitoring method provided by the embodiment of the present application focuses on describing the response method when abnormal power consumption of the analog front end is detected. As shown in FIG. 7, the method specifically includes the following step:

S702: The controller obtains the supply current of the analog front end.

S704: The controller judges whether the supply current of the analog front end is greater than a current threshold, and if yes, execute step S706.

If the power supply current of the analog front end is less than or equal to the current threshold, it means that the current power consumption of the analog front end is normal or the current power consumption of the analog front end is within a controllable range, no operation is required, and the new energy vehicle runs normally.

S706: The controller performs power monitoring according to the supply current of the analog front end.

Specifically, monitoring can be measures such as alarming, decelerating, notifying the control system of the new energy vehicle for corresponding processing, or directly stopping the vehicle.

Optionally, the above steps determine that the supply current of the analog front-end satisfies a predetermined condition, including: judging whether the supply current of the analog front-end is greater than a current threshold; when the supply current of the analog front-end is greater than the current threshold, It is determined that the supply current of the analog front end satisfies a predetermined condition.

In this way, when the power supply current of the analog front-end is greater than the threshold, it is determined that the power supply of the analog front-end is abnormal. The comparison process is simple and accurate, and the reaction speed is fast. The abnormal situation of the analog front-end can be quickly found and dealt with in time, further improving the safety of the battery pack.

Optionally, the power monitoring according to the power supply current includes: when the power supply current is greater than a first predetermined current, issuing a power abnormality alarm; when the power supply current is greater than a second predetermined current, Reduce the running speed of the new energy vehicle where the battery pack is located; wherein, the first predetermined current is smaller than the second predetermined current.

Specifically, when it is detected that the power supply current of the analog front-end exceeds the preset threshold, it indicates that the analog front-end is currently in an abnormal state of power consumption. If no reminder or control is performed, it may cause abnormalities in the power supply system of new energy vehicles, which in turn affects new energy vehicles. Energy vehicles are running normally. In actual implementation, one threshold can be set, and when it is greater than the threshold, it will be prompted. Of course, multiple thresholds can also be set, and the analog front-end supply current can be judged according to the relationship between the current analog front-end supply current and multiple thresholds. The relationship between. For example, two thresholds may be set as a first predetermined current and a second predetermined current.

In this way, the analog front-end is monitored in stages, and when the abnormality of the power supply current is relatively slight, a mild alarm method is used to prompt the abnormality of the current, so as to avoid the loss caused by excessive control. When the power supply current is abnormally serious, emergency measures are taken to prevent serious consequences from happening in time. The level-by-level power monitoring can more accurately control the current state of the analog front end, improving the accuracy and rationality of monitoring.

Optionally, after acquiring the supply current of the analog front end, the method further includes: determining the SOC value of the battery state of charge of the new energy vehicle according to the supply current of the analog front end.

In the existing technology, the BMS current in new energy vehicles mostly uses mature third-party current sensors to realize the total current measurement of the power battery charging or discharging phase. The ampere-hour integration method is one of the common SOC estimation methods for new energy vehicle power battery management systems. The accuracy and real-time performance of current acquisition will affect the SOC estimation results.

In this way, compared to the prior art that only considers the power consumption of the battery, the embodiment of the present application also considers the power consumption of the analog front end itself when calculating the state of charge of the battery pack. For the calculation of the state of charge of the entire battery pack more precise.

Optionally, the battery SOC value of the new energy vehicle is determined by the following formula:

SOC_module=SOC_calculated value*(1-I_AFE/I_total current)

Among them, I_AFE is the AFE supply current value of the battery module; I_total current is the charging and discharging current value of the module.

As shown in FIG. 8 , an embodiment of the present application provides a power monitoring device 800 for a battery management system. The battery management system includes a plurality of battery modules connected in series, and each battery module includes a battery or A plurality of batteries are connected in series, each of the battery modules is connected to an analog front end, and the power monitoring device 800 includes: an acquisition module 802 and a monitoring module 804 .

in,

The obtaining module 802 is configured to obtain the supply current of the analog front end. The monitoring module 804 is configured to perform power monitoring according to the supply current of the analog front end when the supply current of the analog front end satisfies a predetermined condition.

The power monitoring device provided in the embodiment of the present application detects the power supply current of the analog front end, and monitors the power consumption of the analog front end when the power supply current meets the predetermined conditions, which can avoid abnormal power consumption caused by the power supply current of the analog front end itself , Improve the safety of new energy vehicles.

Optionally, the analog front end is connected to the battery through a voltage detection device, and the acquisition module 802 is further configured to: acquire the power supply voltage of the analog front end detected by the voltage detection device; The supply voltage determines the supply current of the analog front end.

Optionally, the voltage detection device is a resistor, and the supply current is determined by the following formula:

I=(V1-V2)/R1

Among them, I is the current of AFE itself, V1 is the power supply voltage of the module, and I is the power supply current of the module.

Optionally, the determining that the supply current of the analog front end satisfies a predetermined condition includes: judging whether the supply current of the analog front end is greater than a current threshold; when the supply current of the analog front end is greater than the current threshold, It is determined that the supply current of the analog front end satisfies a predetermined condition.

Optionally, the monitoring module 804 is further configured to: when the power supply current is greater than a first predetermined current, issue a power abnormality alarm; The running speed of the car where the battery pack is located; wherein, the first predetermined current is smaller than the second predetermined current.

Optionally, the power monitoring device 800 further includes: a state of charge determination module configured to determine the SOC value of the battery state of charge of the new energy vehicle according to the supply current of the analog front end.

Optionally, the battery SOC value of the new energy vehicle is determined by the following formula:

SOC_module=SOC_calculated value*(1-I_AFE/I_total current), wherein, I_AFE is the supply current value of the AFE of the battery module; I_total current is the charge and discharge current value of the module.

As shown in FIG. 9 , an embodiment of the present application provides a power monitoring device 900 for a battery management system, including a processor (processor) 100 and a memory (memory) 101 . Optionally, the device may further include a communication interface (Communication Interface) 102 and a bus 103 . Wherein, the processor 100 , the communication interface 102 , and the memory 101 can communicate with each other through the bus 103 . Communication interface 102 may be used for information transfer. The processor 100 can call the logic instructions in the memory 101 to execute the method for monitoring the power of a battery management system in the above embodiments.

In addition, the above logic instructions in the memory 101 may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as an independent product.

As a computer-readable storage medium, the memory 101 can be used to store software programs and computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present application. The processor 100 executes functional applications and data processing by running the program instructions/modules stored in the memory 101 , that is, implements the power monitoring method for the battery management system of the above-mentioned embodiments.

The memory 101 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application program required by at least one function; the data storage area may store data created according to the use of the terminal device, and the like. In addition, the memory 101 may include a high-speed random access memory, and may also include a non-volatile memory.

As shown in FIG. 10 , the embodiment of the present application provides a new energy vehicle 1000 , including: a new energy vehicle body, the above-mentioned battery management system 200 or 300 , or the above-mentioned power monitoring device 800 or 900 for the battery management system. The above-mentioned battery management system 200 or 300, or the above-mentioned power monitoring device 800 or 900 for the battery management system is installed in the body of the new energy vehicle. The installation relationship expressed here is not limited to the placement inside the new energy vehicle, but also includes the installation connection with other components of the new energy vehicle, including but not limited to physical connection, electrical connection or signal transmission connection. Those skilled in the art can understand that the above-mentioned battery management system 200 or 300, or the above-mentioned power monitoring device 800 or 900 for the battery management system, can be adapted to the feasible new energy vehicle 1000, and then realize other feasible implementations example.

An embodiment of the present application provides a computer-readable storage medium, which stores computer-executable instructions, and the computer-executable instructions are configured to execute the power monitoring method for a battery management system of the above-mentioned embodiments.

An embodiment of the present application provides a computer program product, the computer program product includes a computer program stored on a computer-readable storage medium, the computer program includes program instructions, and when the program instructions are executed by a computer, the The computer executes the power monitoring method for the battery management system of the above embodiments.

The above-mentioned computer-readable storage medium may be a transitory computer-readable storage medium, or a non-transitory computer-readable storage medium.

The technical solutions of the embodiments of the present application can be embodied in the form of software products, which are stored in a storage medium and include one or more instructions to make a computer device (which can be a personal computer, a server, or a network equipment, etc.) to perform all or part of the steps of the method described in the embodiments of the present application. The aforementioned storage medium can be a non-transitory storage medium, including: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk, etc. A medium that can store program code, or a transitory storage medium.

The above description and accompanying drawings sufficiently illustrate the embodiments of the present application to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, procedural, and other changes. The examples merely represent possible variations. Individual components and functions are optional unless explicitly required, and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. Also, the terms used in the present application are used to describe the embodiments only and are not used to limit the claims. As used in the examples and description of the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well unless the context clearly indicates otherwise . Similarly, the term "and/or" as used in this application is meant to include any and all possible combinations of one or more of the associated listed ones. Additionally, when used in this application, the term "comprise" and its variants "comprises" and/or comprising (comprising) etc. refer to stated features, integers, steps, operations, elements, and/or The presence of a component does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groupings of these. Without further limitations, an element defined by the statement "comprising a ..." does not exclude the presence of additional identical elements in the process, method or apparatus comprising said element. Herein, what each embodiment focuses on may be the difference from other embodiments, and the same and similar parts of the various embodiments may refer to each other. For the method, product, etc. disclosed in the embodiment, if it corresponds to the method part disclosed in the embodiment, then the relevant part can refer to the description of the method part.

Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed by hardware or software may depend on the specific application and design constraints of the technical solution. The skilled person may use different methods for each specific application to realize the described functions, but such realization should not be regarded as exceeding the scope of the embodiments of the present application. The skilled person can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units may only be a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined Or it can be integrated into another system, or some features can be ignored, or not implemented. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to implement this embodiment. In addition, each functional unit in the embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.

The flowcharts and block diagrams in the figures show the architecture, functions and operations of possible implementations of the systems, methods and computer program products according to the embodiments of the present application. In this regard, each block in a flowchart or block diagram may represent a module, program segment, or part of code that includes one or more Executable instructions. In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks in succession may, in fact, be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than that disclosed in the description, and sometimes there is no specific agreement between different operations or steps. order. For example, two consecutive operations or steps may, in fact, be performed substantially concurrently, or they may sometimes be performed in the reverse order, depending upon the functionality involved. Each block in the block diagrams and/or flowcharts, and combinations of blocks in the block diagrams and/or flowcharts, can be implemented by a dedicated hardware-based system that performs the specified function or action, or can be implemented by dedicated hardware implemented in combination with computer instructions.

Claims (12)

1. A battery management system, comprising: A plurality of battery modules connected in series, each battery module comprising one battery or a plurality of batteries connected in series, the battery modules configured to supply power for new energy vehicles; A plurality of analog front ends, one end of each analog front end is connected to one or more battery modules through a current detection device, and the analog front end is configured to send the supply current of the analog front end detected by the current detection device; A controller, connected in communication with all the analog front ends, the controller is configured to receive the supply current sent by the analog front ends, and when the supply current of the analog front ends satisfies a predetermined condition, according to the supply current Perform power monitoring on the analog front end. 2. The battery management system according to claim 1, further comprising: The anti-reverse diode is arranged between the analog front end and the battery module. 3. The battery management system according to claim 1, further comprising: A field effect MOS transistor is arranged between the analog front end and the battery module, and the MOS transistor is configured to disconnect the analog front end and the battery module when the current of the analog front end is greater than a threshold set of connections. 4. A power monitoring method for a battery management system, wherein the battery management system includes a plurality of battery modules connected in series, and each battery module includes one battery or a plurality of batteries connected in series, Each of the battery modules is connected to an analog front end; the method includes: obtaining the supply current of the analog front end; When the power supply current of the analog front end satisfies a predetermined condition, power monitoring is performed according to the power supply current of the analog front end. 5. The power monitoring method according to claim 4, wherein the analog front end is connected to the battery through a voltage detection device, and the obtaining the supply current of the analog front end comprises: Acquiring the power supply voltage of the analog front end detected by the voltage detection device; The supply current of the analog front end is determined according to the supply voltage of the analog front end. 6. The power monitoring method according to claim 4, wherein the determining that the supply current of the analog front end satisfies a predetermined condition comprises: judging whether the supply current of the analog front end is greater than a current threshold; If the supply current of the analog front end is greater than the current threshold, it is determined that the supply current of the analog front end satisfies a predetermined condition. 7. The power monitoring method according to claim 6, wherein the power monitoring according to the power supply current comprises: When the power supply current is greater than the first predetermined current, an abnormal power alarm is issued; When the supply current is greater than a second predetermined current, reduce the running speed of the vehicle where the battery pack is located; wherein, the first predetermined current is smaller than the second predetermined current. 8. The power monitoring method according to claim 4, characterized in that, after acquiring the supply current of the analog front end, further comprising: The SOC value of the battery state of charge of the new energy vehicle is determined according to the supply current of the analog front end. 9. A power monitoring device for a battery management system, characterized in that the battery management system includes a plurality of battery modules connected in series, and each battery module includes one battery or a plurality of batteries connected in series, Each of the battery modules is connected to an analog front end; the device includes: An acquisition module configured to acquire the supply current of the analog front end; The monitoring module is configured to perform power monitoring according to the power supply current of the analog front end when the power supply current of the analog front end satisfies a predetermined condition. 10. A power monitoring device for a battery management system, comprising a processor and a memory storing program instructions, wherein the processor is configured to, when executing the program instructions, perform the following steps as claimed in claims 4 to 10. 8. The power monitoring method for a battery management system described in any one of these items. 11. A new energy vehicle, characterized in that it comprises: New energy vehicle body; The battery management system according to any one of claims 1 to 3, installed in the body of the new energy vehicle; or, The power monitoring device for the battery management system according to claim 9 or 10 is installed in the main body of the new energy vehicle. 12. A computer-readable storage medium, characterized in that, the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are configured to execute the method according to any one of claims 4 to 8. A power monitoring method for a battery management system.

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