CN115817272A

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

Info

Publication number: CN115817272A
Application number: CN202211646279.1A
Authority: CN
Inventors: 黄钧
Original assignee: Beijing Ziguang Xinneng Technology Co Ltd
Current assignee: Beijing Ziguang Xinneng Technology Co Ltd
Priority date: 2022-12-21
Filing date: 2022-12-21
Publication date: 2023-03-21

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, electric quantity monitoring method and device thereof, and new energy automobile

Technical Field

The application relates to the technical field of new energy vehicles, for example, to a battery management system, an electric quantity monitoring method and device thereof, and a new energy vehicle.

Background

BMS (Battery management system) is a vital component in new energy vehicles. The battery can be safely, reliably and efficiently used in the life cycle. The BMS has the main functions of detecting the voltage, the current, the temperature, the capacity and even other environmental parameters of the battery in the use process of charging, discharging and the like in a safety range, ensuring the use safety of the battery, prolonging the service life, improving the efficiency and the like.

In a BMS of a new energy vehicle, an AFE (analog front end), i.e., a battery sampling chip, is used to collect parameters such as cell voltage and temperature. When the existing BMS estimates or monitors the electric quantity of the power battery pack, the electric quantity of the power battery pack is usually considered, and whether the electric quantity of the power battery pack is abnormal or not is considered, however, when the new energy automobile actually runs, other devices including the AFE also have the electric quantity consumption, and the electric quantity of the other devices is easily ignored.

It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present application and therefore may include information that does not constitute prior art known to a person of ordinary skill in the art.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.

The embodiment of the application provides a battery management system, an electric quantity monitoring method and device thereof and a new energy automobile, so that the safety of a battery is improved.

In some embodiments, the battery management system comprises: a plurality of battery modules connected in series, each battery module including one battery or a plurality of batteries connected in series, the battery modules being configured to supply power to the new energy vehicle; the system comprises a plurality of analog front ends, a plurality of battery modules and a plurality of control modules, wherein one end of each analog front end is connected with one or more battery modules through a current detection device, and the analog front ends are configured to send supply currents of the analog front ends detected by the current detection devices; the controller is connected with all the analog front ends in a communication mode and is configured to receive the power supply current sent by the analog front ends and monitor the electric quantity of the analog front ends according to the power supply current under the condition that the power supply current of the analog front ends meets a preset condition.

Optionally, the current detection device is a resistor.

Optionally, the method further comprises: and the anti-reverse diode is arranged between the analog front end and the battery module.

Optionally, the method further comprises: the MOS tube is arranged between the analog front end and the battery module and is configured to disconnect the analog front end from the battery module under the condition that the current of the analog front end is greater than a threshold value.

Optionally, the MOS transistor is a PMOS transistor.

In some embodiments, the method is applied to a battery management system, 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, each battery module is connected to an analog front end, and the method includes: acquiring the power supply current of the analog front end; and under the condition that the power supply current of the analog front end meets a preset condition, monitoring the electric quantity according to the power supply current of the analog front end.

In some embodiments, the apparatus 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 battery module is connected to an analog front end, and the apparatus includes: an acquisition module configured to acquire a supply current of the analog front end; the monitoring module is configured to monitor electric quantity according to the supply current of the analog front end under the condition that the supply current of the analog front end meets a preset condition.

In some embodiments, the new energy vehicle includes: the new energy automobile body, the above battery management system are installed in the new energy automobile body, or the above electric quantity monitoring device for the battery management system is installed in the new energy automobile body.

The battery management system, the electric quantity monitoring method and device thereof and the new energy automobile provided by the embodiment of the application can realize the following technical effects:

through increasing current detection device in current battery management system to detect the supply current of simulation front end, and carry out the electric quantity control of simulation front end under the condition that supply current satisfies predetermined condition, can avoid simulating the power consumption anomaly that the supply current of front end self leads to, improve new energy automobile's security.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:

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 according to an embodiment of the present disclosure;

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

fig. 4 is a schematic structural diagram of an analog front end according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of another analog front end provided in the embodiment of the present application;

fig. 6 is a flowchart of a power monitoring method for a battery management system according to an embodiment of the present disclosure;

fig. 7 is a flowchart of another power monitoring method for a battery management system according to an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of an electric quantity monitoring apparatus for a battery management system according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of another power monitoring apparatus for a battery management system according to an embodiment of the present disclosure;

fig. 10 is a schematic view of a new energy vehicle according to an embodiment of the present application.

Detailed Description

So that the manner in which the features and elements of the present embodiments can be understood in detail, a more particular description of the embodiments, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, 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 in simplified form in order to simplify the drawing.

The terms "first," "second," and the like in the description and in the claims of the embodiments of the application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present application are described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

The term "plurality" means two or more unless otherwise specified.

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

The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.

Most of AFE power supply in the technical route of the current BMS is provided by a module of the power battery, and the current BMS only considers the influence of total current on the SOC of the power battery during charging and discharging when carrying out SOC estimation (using an ampere-hour integration method), and does not consider the power consumption of the AFE. The AFE processes the working state in the charging or discharging phase 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 inaccurate, and the estimation of the endurance mileage and the charging time of the whole vehicle is influenced; 2. AFE self electric current is in the unmonitored state, if BMS's AFE acquisition circuit consumption is unusual, BMS can't in time diagnose and can cause the module battery unbalanced, seriously influences the continuation of the journey mileage and the charging time estimation of whole car.

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

The power battery is composed of power battery modules BM 1-BMn, and each battery module is connected with an Analog Front End (AFE) chip of a Battery Management System (BMS) and a related hardware circuit and is used for detecting all serially connected battery monomers in the module and analog signals of a high-voltage area of the battery module. The current sensor A1 is used to detect the total current of the power battery in the charging or discharging operation mode, and this current is also an important basis for the BMS to estimate the SOC. I _ C1 is the current direction during charging, and I _ D1 is the current direction during discharging. MSD may be referred to as a maintenance switch for disconnecting the battery link while performing maintenance to avoid electrical shock.

According to the embodiment of the application, the supply current collecting device of the AFE chip is added on the basis of the original BMS, and module ampere-hour integral correction is realized by using the collected current value and the module voltage value as parameters and referring to the ampere-hour integral of the BMS. The actual current value of the power battery for charging or discharging can be calculated through the current detection consumed by the AFE, so that the SOC estimation accuracy of the power battery of the new energy automobile is improved. And when the AFE detects that the current value of the power supply exceeds a preset threshold value, sending an AFE power supply current consumption abnormity alarm signal for the BMS and the whole vehicle to perform fault analysis and processing.

Referring to fig. 2, a battery management system 200 according to an embodiment of the present disclosure is provided, where the battery management system 200 includes: a battery module 202, a current detection device 204, an analog front end 206, and a controller 208. Wherein:

the battery module 202 is a plurality of (as 202 in fig. 2 is an exemplary listed battery module), each battery module 202 in the plurality of battery modules includes a plurality of batteries 2021 connected in series, and the battery module 202 is configured to supply power to the new energy vehicle.

The analog front end 206 is a plurality of analog front ends (fig. 2 only schematically lists one analog front end), one end of each analog front end 206 of the plurality of analog front ends 206 is connected with one or more battery modules 202 through a current detection device 204, and the analog front end 406 is configured to transmit the supply current of the analog front end 206 detected by the current detection device 204;

a controller 208 is communicatively coupled to all of the analog front ends 206, and the controller 208 is configured to receive the supply current sent by the analog front ends 206 and monitor the analog front ends 206 according to the supply current if the supply current of the analog front ends 206 meets a predetermined condition.

The battery management system that this application embodiment provided is through increasing current detection device in current battery management system to detect the supply current of simulation front end, and carry out the electric quantity control of simulation front end under supply current satisfies the condition of predetermined condition, can avoid the power consumption that the supply current of simulation front end self leads to unusual, improve new energy automobile's security.

Optionally, the current detection device is a resistor.

Like this, carry out current detection based on resistance, only need carry out simple transformation to the group battery among the prior art, it is with low costs, and easily realize.

In the following, referring to the battery management system shown in fig. 3, taking AFE1 power supply current collection as an example, how to perform the supply current of the analog front end AFE, modify SOC based on the supply current, and monitor power consumption of the AFE will be described in detail. 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 the AFE 1.

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

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

The BMS master control unit is the controller 208 in the above-described embodiment.

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

I＝(V1-V2)/R1

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

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

SOC _ module = SOC _ calculated value (1-I _ AFE/I _ total current)

Wherein, I _ AFE is the power supply current value of the battery module AFE 1; the I _ total current is the charging and discharging current value of the battery module.

All the battery modules form the battery pack of the whole new energy automobile, the charging and discharging current value is the total current value of the battery pack, and the total current value of the battery pack is the current value of each battery as all the batteries in the battery modules are connected in series.

(5) And the BMS main control unit sets a reference value Imax of the supply current of each battery module AFE, and when the calculated AFE supply current value I is larger than Imax, an AFE supply current abnormity alarm signal is triggered for the VCU to alarm.

Specifically, the alarm processing is divided into three stages, specifically divided as follows:

first-stage: the power consumption is serious, and the vehicle can be stopped immediately.

And (2) second stage: and prompting maintenance.

Third-stage: one or more of the following operations may be performed:

degradation processing, speed limiting, recording and instrument display.

It is understood that the above steps (4) and (5) can be performed after calculating the current value of each AFE, i.e. the steps (4) and (5) do not need to be performed simultaneously, and there is no limitation on the order of performing the steps one after another.

With reference to fig. 4, a schematic structural diagram of an analog front end provided in an embodiment of the present application is shown, where the analog front end further includes, on the basis of fig. 2: an anti-reverse diode 302 is disposed between the analog front end 206 and the battery module 202.

Therefore, through the one-way conduction characteristic of the diode, the simulation front end and the battery module can be disconnected in time when the current of the simulation front end flows to the battery module in a reverse phase manner, so that the damage to the battery module is avoided.

Optionally, an embodiment of the present application further provides a battery management system, where on the basis of the battery management system 200 shown in fig. 2, the battery management system further includes: a MOS transistor disposed between the analog front end 206 and the battery module 202, the MOS transistor being configured to disconnect the analog front end 206 from the battery module 202 when a current of the analog front end 206 is greater than a threshold value.

Alternatively, the MOS transistor may be mounted on the battery management system shown in fig. 2, or may be mounted 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 according to an embodiment of the present disclosure. Like this, when the electric current of simulation front end was too big, turn off the supply voltage of simulation front end fast through the characteristic of MOS pipe self, compare and control through ACU or BMS through software, can get rid of the potential safety hazard more in time fast, further promote the security of battery.

Referring to fig. 6, a method for monitoring power of a battery management system according to an embodiment of the present application is provided, where the battery management system includes a plurality of battery modules connected in series, each battery module includes one battery or a plurality of batteries connected in series, and each battery module is connected to an analog front end, and the method is applied to a controller in the battery management system, and includes the following steps:

s602: the controller obtains the supply current of the analog front end.

S604: and the controller monitors the electric quantity according to the power supply current of the analog front end under the condition that the power supply current of the analog front end meets a preset condition.

The electric quantity monitoring method provided by the embodiment of the application detects the supply current of the analog front end, monitors the electric quantity of the analog front end under the condition that the supply current meets the preset condition, can avoid the abnormal power consumption caused by the supply current of the analog front end, and improves the safety of the new energy automobile.

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

wherein, I is the current of AFE, V1 is the supply voltage of the module, and I is the supply current of the module.

Referring to fig. 7, another power consumption monitoring method provided in the embodiment of the present application focuses on describing a corresponding manner when detecting that power consumption of an analog front end is abnormal, and as shown in fig. 7, the method specifically includes the following steps:

s702: the controller obtains the supply current of the analog front end.

S704: the controller determines whether the supply current of the analog front end is greater than a current threshold, and if so, executes step S706.

If the power supply current of the analog front end is smaller than or equal to the current threshold, 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, operation is not needed, and the new energy automobile runs normally.

S706: and the controller monitors the electric quantity according to the power supply current of the analog front end.

Specifically, the monitoring can be measures such as alarming, decelerating, informing a new energy automobile control system to perform corresponding processing, or directly stopping the automobile.

Optionally, the determining that the supply current of the analog front end satisfies a predetermined condition includes: judging whether the power supply current of the analog front end is larger than a current threshold value; and determining that the supply current of the analog front end meets a predetermined condition when the supply current of the analog front end is greater than the current threshold.

Therefore, when the power supply current of the analog front end is larger than the threshold value, the power supply abnormality of the analog front end is determined, the comparison process is simple and accurate, the reaction speed is high, the abnormal condition of the analog front end can be rapidly found and timely processed, and the safety of the battery pack is further improved.

Optionally, the monitoring the electric quantity according to the supply current includes: sending out an electric quantity abnormal alarm under the condition that the power supply current is greater than a first preset current; reducing the running speed of the new energy automobile where the battery pack is located under the condition that the power supply current is larger than a second preset current; wherein the first predetermined current is less than the second predetermined current.

Specifically, when the fact that the power supply current of the analog front end exceeds a preset threshold value is detected, the fact that the analog front end is in an abnormal power consumption state currently is indicated, and if the power supply current of the analog front end is not reminded or controlled, the fact that a new energy automobile power supply system is abnormal may be caused, and therefore normal operation of the new energy automobile is affected. In actual implementation, one threshold may be set, and when the threshold is larger than the threshold, the indication is given, or naturally, a plurality of thresholds may be set, and the relationship between the current supply current of the analog front end and the plurality of thresholds may be determined according to the relationship between the current supply current of the analog front end and the plurality of thresholds. For example, two thresholds may be set to a first predetermined current and a second predetermined current.

Therefore, the analog front end is monitored in a grading mode, when the power supply current is slightly abnormal, a mild alarm means is adopted to prompt the current abnormality, and loss caused by excessive control is avoided. And when the power supply current is abnormal seriously, an emergency measure is adopted to timely prevent serious consequences, the current state of the analog front end can be more accurately controlled by monitoring the classified electric quantity, and the monitoring accuracy and the monitoring rationality are improved.

Optionally, after obtaining the supply current of the analog front end, the method further includes: and determining the SOC value of the battery of the new energy automobile according to the power supply current of the analog front end.

In the prior art, a mature third-party current sensor is selected for BMS current in a new energy automobile, so that total current measurement of a power battery in a charging or discharging stage is realized. An ampere-hour integral method is one of common SOC estimation methods for a new energy automobile power battery management system, and the accuracy and real-time performance of current collection can affect the estimation result of SOC.

In this way, compared with the prior art that only the power consumption of the battery is considered, the power consumption of the analog front end is also considered when the charge state of the battery pack is calculated in the embodiment of the application, and the charge state of the whole battery pack is calculated more accurately.

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

SOC _ module = SOC _ calculated value (1-I _ AFE/I _ total current)

Wherein, I _ AFE is the power supply current value of the battery module AFE; the I _ total current is the module charging/discharging current value.

Referring to fig. 8, an embodiment of the present application provides an electric quantity monitoring apparatus 800 for a battery management system, where 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 each battery module is connected to an analog front end, and the electric quantity monitoring apparatus 800 includes: an acquisition module 802 and a monitoring module 804.

Wherein the content of the first and second substances,

the acquisition module 802 is configured to acquire a supply current of the analog front end. The monitoring module 804 is configured to monitor the power according to the supply current of the analog front end in case the supply current of the analog front end satisfies a predetermined condition.

The electric quantity monitoring device that this application embodiment provided detects the supply current of simulation front end to carry out the electric quantity control of simulation front end under the condition that supply current satisfies the predetermined condition, can avoid simulating the power consumption anomaly that the supply current of front end self leads to, improve new energy automobile's security.

Optionally, the analog front end is connected to the battery through a voltage detection device, and the obtaining module 802 is further configured to: acquiring the power supply voltage of the analog front end detected by the voltage detection device; and determining the supply current of the analog front end according to the supply voltage of the analog front end.

I＝(V1-V2)/R1

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

Optionally, the monitoring module 804 is further configured to: sending out an electric quantity abnormal alarm under the condition that the power supply current is greater than a first preset current; reducing the running speed of the automobile where the battery pack is located under the condition that the power supply current is greater than a second preset current; wherein the first predetermined current is less than the second predetermined current.

Optionally, the power monitoring apparatus 800 further includes: the state of charge determining module is configured to determine a battery state of charge (SOC) value of the new energy automobile according to the power supply current of the simulation front end.

SOC _ module = SOC _ calculated value (1-I _ AFE/I _ total current), where I _ AFE is a battery module AFE supply current value; the I _ total current is the module charging/discharging current value.

As shown in fig. 9, an embodiment of the present application provides a power monitoring apparatus 900 for a battery management system, which includes a processor (processor) 100 and a memory (memory) 101. Optionally, the apparatus may also include a Communication Interface (Communication Interface) 102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other via a bus 103. The communication interface 102 may be used for information transfer. The processor 100 may call logic instructions in the memory 101 to perform the power monitoring method for the battery management system of the above embodiment.

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

The memory 101 is a computer-readable storage medium and can be used for storing software programs, 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 executing program instructions/modules stored in the memory 101, that is, implements the power monitoring method for the battery management system of the above-described embodiment.

The memory 101 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data 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 nonvolatile memory.

Referring to fig. 10, an embodiment of the present application provides a new energy vehicle 1000, including: the new energy automobile body, the battery management system 200 or 300, or the electric quantity monitoring device 800 or 900 for the battery management system. The battery management system 200 or 300 or the electric quantity monitoring device 800 or 900 for the battery management system is installed in the new energy vehicle body. The installation relation stated herein is not limited to be placed inside the new energy vehicle, but also includes installation connection with other components of the new energy vehicle, including but not limited to physical connection, electrical connection, or signal transmission connection. It will be understood by those skilled in the art that the battery management system 200 or 300, or the power monitoring apparatus 800 or 900 for a battery management system, may be adapted to a feasible new energy vehicle 1000, so as to implement other feasible embodiments.

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

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

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

The technical solution of the embodiment of the present application may be embodied in the form of a software product, where the computer software product is stored in a storage medium and includes one or more instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method described in the embodiment of the present application. And the aforementioned storage medium may be a non-transitory storage medium comprising: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes, and may also be a transient storage medium.

The above description and drawings sufficiently illustrate embodiments of the application to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. Furthermore, the words used in the specification are words of description for example only and are not limiting upon the claims. As used in the description of the embodiments and 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 encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising a" \8230; "does not exclude the presence of additional like elements in a process, method or apparatus comprising the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosures, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.

Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the embodiments of the present application. It can be clearly understood by the skilled person that, for convenience and simplicity of description, the specific working processes of the above-described systems, apparatuses, and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be merely a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than disclosed in the description, and sometimes there is no specific order between the different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Claims

1.A battery management system, comprising:

the system comprises a plurality of battery modules connected in series, a controller and a controller, wherein each battery module comprises a battery or a plurality of batteries connected in series, and the battery modules are configured to supply power for the new energy automobile;

the system comprises a plurality of analog front ends, a plurality of battery modules and a plurality of control modules, wherein one end of each analog front end is connected with one or more battery modules through a current detection device, and the analog front ends are configured to send supply currents of the analog front ends detected by the current detection devices;

the controller is connected with all the analog front ends in a communication mode and is configured to receive the power supply current sent by the analog front ends and monitor the electric quantity of the analog front ends according to the power supply current under the condition that the power supply current of the analog front ends meets a preset condition.

2. The battery management system of claim 1, further comprising:

and the anti-reverse diode is arranged between the analog front end and the battery module.

3. The battery management system of claim 1, further comprising:

the field-effect MOS tube is arranged between the analog front end and the battery module, and the MOS tube is configured to disconnect the analog front end from the battery module under the condition that the current of the analog front end is greater than a threshold value.

4. The electric quantity monitoring method for the battery management system is characterized in that the battery management system comprises a plurality of battery modules which are connected in series, each battery module comprises a battery or a plurality of batteries which are connected in series, and each battery module is connected with an analog front end; the method comprises the following steps:

acquiring the power supply current of the analog front end;

and under the condition that the power supply current of the analog front end meets a preset condition, monitoring the electric quantity according to the power supply current of the analog front end.

5. The method for monitoring electric quantity according to claim 4, wherein the analog front end is connected to the battery through a voltage detection device, and the obtaining of the supply current of the analog front end includes:

acquiring the power supply voltage of the analog front end detected by the voltage detection device;

and determining the supply current of the analog front end according to the supply voltage of the analog front end.

6. The method for monitoring power consumption according to claim 4, wherein the determining that the supply current of the analog front end satisfies a predetermined condition comprises:

judging whether the power supply current of the analog front end is larger than a current threshold value;

determining that the supply current of the analog front end satisfies a predetermined condition when the supply current of the analog front end is greater than the current threshold.

7. The method for monitoring electric quantity according to claim 6, wherein the step of monitoring electric quantity according to the supply current comprises:

sending out an electric quantity abnormal alarm under the condition that the power supply current is greater than a first preset current;

reducing the running speed of the automobile where the battery pack is located under the condition that the power supply current is greater than a second preset current; wherein the first predetermined current is less than the second predetermined current.

8. The method for monitoring electric quantity according to claim 4, further comprising, after obtaining the supply current of the analog front end:

and determining the SOC value of the battery of the new energy automobile according to the power supply current of the analog front end.

9. The electric quantity monitoring device for the battery management system is characterized in that the battery management system comprises a plurality of battery modules which are connected in series, each battery module comprises a battery or a plurality of batteries which are connected in series, and each battery module is connected with an analog front end; the device comprises:

an acquisition module configured to acquire a supply current of the analog front end;

the monitoring module is configured to monitor electric quantity according to the supply current of the analog front end under the condition that the supply current of the analog front end meets a preset condition.

10. A power monitoring apparatus for a battery management system, comprising a processor and a memory having stored thereon program instructions, wherein the processor is configured to perform the power monitoring method for a battery management system of any of claims 4 to 8 when executing the program instructions.

11. A new energy automobile is characterized by comprising:

a new energy automobile body;

the battery management system according to any one of claims 1 to 3, being installed in the new energy vehicle body; alternatively, the first and second electrodes may be,

the electric quantity monitoring device for the battery management system according to claim 9 or 10, which is installed in the new energy vehicle body.

12. A computer-readable storage medium storing computer-executable instructions configured to perform the method for monitoring power of a battery management system according to any one of claims 4 to 8.