Low-voltage lithium battery power management system and method, electronic equipment and storage medium

Abstract

The invention provides a low-voltage lithium battery power management system and method, electronic equipment and a storage medium, and relates to the technical field of lithium batteries, and the system comprises an analog front end acquisition module which is used for acquiring the current, voltage and temperature of a battery cell, and transmitting the current, voltage and temperature to a domain controller in a daisy chain communication mode; the domain controller is used for determining whether the low-voltage lithium battery is in an abnormal state or not based on the current, the voltage and the temperature; if yes, an instruction for cutting off the charging and discharging circuit is sent to an analog front-end acquisition module in a daisy chain communication mode, so that the analog front-end acquisition module controls an MOS switch to cut off the charging and discharging circuit through an MOS driving module according to the instruction; if not, the MOS switch is controlled to enable the low-voltage lithium battery to supply power to the domain controller and other power utilization modules, and the high-voltage battery of the vehicle charges the low-voltage lithium battery through the high-low voltage converter. According to the invention, the specification of the analog front-end acquisition module can be effectively reduced, so that the hardware cost of the system is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to a low-voltage lithium battery power management system, method, electronic equipment and storage medium. Background Art

[0002] With the popularity of new energy vehicles and the increase in functional configurations, the whole vehicle has put forward more requirements for 12V batteries. Compared with traditional lead-acid batteries, low-voltage lithium batteries have the advantages of high energy density, long life, small size, light weight, environmental protection, pollution-free and non-toxicity, which conforms to the development trend of the vehicle industry and gradually replaces lead-acid batteries.

[0003] At present, low-voltage lithium battery power management systems usually collect the state parameters of the low-voltage lithium battery cells, calculate them through the local microcontroller unit (MCU), and control the relays of the load circuits to achieve the on and off control of each load circuit to meet the external power supply needs and the shutdown protection of itself. However, the low-voltage lithium battery power management system has high requirements on the computing power of the local MCU. Summary of the invention

[0004] The purpose of the present invention is to provide a low-voltage lithium battery power management system, method, electronic device and storage medium to solve the problem that the current low-voltage lithium battery power management system has high requirements on the computing power of the local MCU.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A low-voltage lithium battery power management system comprises: an analog front-end acquisition module, a MOS drive module, a MOS switch and a domain controller; wherein the analog front-end acquisition module is respectively connected to the battery cell of the low-voltage lithium battery of a vehicle, the MOS drive module and the domain controller; the MOS switch is respectively connected to the MOS drive module, the battery cell of the low-voltage lithium battery, the domain controller, the high-low voltage converter of the vehicle and other power-consuming modules; the analog front-end acquisition module is used to acquire the current, voltage and temperature of the battery cell, and send the current, voltage and temperature to the domain controller via a daisy chain communication method; the domain controller is used to determine whether the low-voltage lithium battery is in an abnormal state based on the current, voltage and temperature; if so, an instruction for cutting off a charge and discharge circuit is sent to the analog front-end acquisition module via a daisy chain communication method, so that the analog front-end acquisition module controls the MOS switch to cut off the charge and discharge circuit according to the instruction through the MOS drive module; if not, the MOS switch is controlled so that the low-voltage lithium battery supplies power to the domain controller and other power-consuming modules, and the high-voltage battery of the vehicle charges the low-voltage lithium battery via the high-low voltage converter.

[0007] According to the above technical means, the redundant computing power of the domain controller is fully utilized, and based on the current, voltage and temperature of the battery cell sent by the analog front-end acquisition module through the daisy chain communication method, it is determined whether the low-voltage lithium battery is in an abnormal state; when the low-voltage lithium battery is in an abnormal state, the MOS switch is promptly controlled by the MOS driver module to cut off the charging and discharging circuit to protect the safety of the low-voltage lithium battery and the entire vehicle, and the MCU is no longer used. Therefore, the specifications of the analog front-end acquisition module can be effectively reduced. On the premise of meeting the functional safety level of the entire vehicle, the hardware cost of the low-voltage lithium battery power management system can be greatly reduced.

[0008] Furthermore, the analog front-end acquisition module includes a filter, an amplifier and a differential signal conversion submodule; when the analog front-end acquisition module is used to send current, voltage and temperature to the domain controller via a daisy chain communication method, it is specifically used to: preprocess the collected current, voltage and temperature to obtain a preprocessed current, a preprocessed voltage and a preprocessed temperature, the preprocessing including filtering the current, voltage and temperature through a filter, amplifying the current, voltage and temperature through an amplifier, and converting the current, voltage and temperature from analog signals to differential signals through a differential signal conversion submodule; and sending the preprocessed current, preprocessed voltage and preprocessed temperature to the domain controller via a daisy chain communication method.

[0009] Furthermore, when the domain controller is used to determine whether the low-voltage lithium battery is in an abnormal state based on current, voltage and temperature, it is specifically used to determine whether the low-voltage lithium battery is in an abnormal state based on pre-processed current, pre-processed voltage and pre-processed temperature.

[0010] Furthermore, the domain controller is also used for at least one of the following: obtaining the charge state of the low-voltage lithium battery based on current, voltage, temperature and time; obtaining the health status of the low-voltage lithium battery based on current, voltage, temperature, internal resistance of the low-voltage lithium battery and number of charge and discharge cycles; and actively or passively balancing the battery cells based on current, voltage and temperature.

[0011] Furthermore, when the domain controller is used to determine whether the low-voltage lithium battery is in an abnormal state based on current, voltage and temperature, it is specifically used to: if the voltage is less than the voltage threshold or the charge state of the low-voltage lithium battery is less than the charge threshold, it is determined that the low-voltage lithium battery is in an abnormal state, and the abnormal state is an over-discharge state.

[0012] Furthermore, when the domain controller is used to determine whether the low-voltage lithium battery is in an abnormal state based on current, voltage and temperature, it is specifically used to: if the temperature is greater than the temperature threshold, it is determined that the low-voltage lithium battery is in an abnormal state, and the abnormal state is an overheating state.

[0013] Furthermore, when the analog front-end acquisition module is used to collect the current, voltage and temperature of the battery cell, it is specifically used to: collect current by cooperating with the vehicle's current measuring equipment; collect voltage through the circuit connected to the battery cell; and collect temperature through the temperature sensor integrated in the analog front-end acquisition module.

[0014] A low-voltage lithium battery power management method is applied to the low-voltage lithium battery power management system as described above in the present invention, and the low-voltage lithium battery power management method comprises: an analog front-end acquisition module acquires the current, voltage and temperature of the battery cell of the low-voltage lithium battery, and sends the current, voltage and temperature to a domain controller via a daisy chain communication method; the domain controller determines whether the low-voltage lithium battery is in an abnormal state based on the current, voltage and temperature; if so, an instruction for cutting off a charge and discharge circuit is sent to the analog front-end acquisition module via a daisy chain communication method, so that the analog front-end acquisition module controls a MOS switch to cut off the charge and discharge circuit according to the instruction through a MOS driving module; if not, the MOS switch is controlled so that the low-voltage lithium battery supplies power to the domain controller and other power-consuming modules, and the high-voltage battery of the vehicle charges the low-voltage lithium battery via a high-low voltage converter.

[0015] Furthermore, the analog front-end acquisition module includes a filter, an amplifier and a differential signal conversion submodule; the analog front-end acquisition module sends current, voltage and temperature to the domain controller via a daisy chain communication method, including: preprocessing the collected current, voltage and temperature to obtain preprocessed current, preprocessed voltage and preprocessed temperature, the preprocessing includes filtering the current, voltage and temperature through a filter, amplifying the current, voltage and temperature through an amplifier, and converting the current, voltage and temperature from analog signals to differential signals through a differential signal conversion submodule; sending the preprocessed current, preprocessed voltage and preprocessed temperature to the domain controller via a daisy chain communication method.

[0016] Further, the domain controller determines whether the low-voltage lithium battery is in an abnormal state based on the current, voltage and temperature, including: determining whether the low-voltage lithium battery is in an abnormal state based on the pre-processed current, pre-processed voltage and pre-processed temperature.

[0017] Furthermore, the low-voltage lithium battery power management method also includes at least one of the following: the domain controller obtains the charge state of the low-voltage lithium battery based on current, voltage, temperature and time; the domain controller obtains the health status of the low-voltage lithium battery based on current, voltage, temperature, internal resistance and number of charge and discharge cycles of the low-voltage lithium battery; the domain controller performs active or passive balancing on the battery cells based on current, voltage and temperature.

[0018] Furthermore, the domain controller determines whether the low-voltage lithium battery is in an abnormal state based on the current, voltage and temperature, including: if the voltage is less than the voltage threshold or the charge state of the low-voltage lithium battery is less than the charge threshold, it is determined that the low-voltage lithium battery is in an abnormal state, and the abnormal state is an over-discharge state.

[0019] Furthermore, the domain controller determines whether the low-voltage lithium battery is in an abnormal state based on the current, voltage and temperature, including: if the temperature is greater than the temperature threshold, it is determined that the low-voltage lithium battery is in an abnormal state, and the abnormal state is an overheating state.

[0020] Furthermore, the analog front-end acquisition module collects the current, voltage and temperature of the battery cell, including: collecting current by cooperating with the vehicle's current measuring equipment; collecting voltage through a circuit connected to the battery cell; and collecting temperature through a temperature sensor integrated in the analog front-end acquisition module.

[0021] A vehicle comprises a vehicle body, front wheels and rear wheels, wherein the vehicle body is arranged between the front wheels and the rear wheels; the vehicle also comprises a low-voltage lithium battery power management system as described above in the present invention arranged on the vehicle body.

[0022] An electronic device comprises: a processor and a memory connected to the processor in communication; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the low-voltage lithium battery power management method as described above in the present invention.

[0023] A computer-readable storage medium stores computer program instructions. When the computer program instructions are executed, the low-voltage lithium battery power management method of the present invention is implemented.

[0024] A computer program product includes a computer program. When the computer program is executed, the low-voltage lithium battery power management method of the present invention is implemented.

[0025] Beneficial effects of the present invention: The low-voltage lithium battery power management system, method, electronic device and storage medium provided by the present invention, the low-voltage lithium battery power management system includes an analog front-end acquisition module, a MOS drive module, a MOS switch and a domain controller; the analog front-end acquisition module is used to collect the current, voltage and temperature of the battery cell, and send the current, voltage and temperature to the domain controller through a daisy chain communication method; the domain controller is used to determine whether the low-voltage lithium battery is in an abnormal state based on the current, voltage and temperature; if so, an instruction for cutting off the charge and discharge circuit is sent to the analog front-end acquisition module through a daisy chain communication method, so that the analog front-end acquisition module controls the MOS switch to cut off the charge and discharge circuit according to the instruction through the MOS drive module; if not, the MOS switch is controlled so that the low-voltage lithium battery supplies power to the domain controller and other power-consuming modules, and the high-voltage battery of the vehicle charges the low-voltage lithium battery through a high-low voltage converter. The present invention makes full use of the redundant computing power of the domain controller, and determines whether the low-voltage lithium battery is in an abnormal state based on the current, voltage and temperature of the battery cell sent by the analog front-end acquisition module through the daisy chain communication mode; when the low-voltage lithium battery is in an abnormal state, the MOS switch is promptly controlled by the MOS driving module to cut off the charging and discharging circuit to protect the safety of the low-voltage lithium battery and the whole vehicle, and the MCU is no longer used. Therefore, the specifications of the analog front-end acquisition module can be effectively reduced. On the premise of meeting the functional safety level of the whole vehicle, the hardware cost of the low-voltage lithium battery power management system can be greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 A schematic diagram of a low-voltage lithium battery power management system provided by an embodiment of the present invention;

[0028] Figure 2 A schematic diagram of a low-voltage lithium battery power management system provided by another embodiment of the present invention;

[0029] Figure 3 A schematic diagram of a flow chart of a low-voltage lithium battery power management method provided by an embodiment of the present invention;

[0030] Figure 4 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0032] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0033] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in the present invention are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards, and corresponding operation entrances shall be provided for users to choose to authorize or refuse.

[0034] First, some technical terms involved in the present invention are explained:

[0035] Metal-Oxide-Semiconductor (MOS) is a technology used to manufacture integrated circuits; the core component of MOS technology is the Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET).

[0036] With the popularity of new energy vehicles and the increase in functional configurations, the whole vehicle has put forward more requirements for 12V batteries, which are difficult to meet with traditional lead-acid batteries: (1) The intelligent charging function requires 50% deep discharge (DOD) of the 12V battery during the warranty period, and the cycle life is greater than 3000 times; (2) For every 1 kilogram (kg) increase in the weight of the 12V battery, the vehicle's range will be reduced by about 0.2 kilometers (km); (3) Smaller volume and layout space, for example, the battery is arranged under the rear seat of the vehicle, which requires a smaller Z-direction dimension; (4) Under low-temperature and high-speed emergency parking conditions, the 12V battery is required to continuously supply power for more than 1 minute and the discharge capacity is greater than 1 kilowatt (kw). Compared with traditional lead-acid batteries, low-voltage lithium batteries have the advantages of high energy density, long life, small size, light weight, environmental protection, pollution-free and non-toxicity, etc., which are in line with the development trend of the vehicle industry and gradually replace lead-acid batteries.

[0037] At present, the low-voltage lithium battery power management system usually collects the state parameters of the low-voltage lithium battery cells, and after calculation by the local MCU, controls the relays of the load circuit to realize the connection and disconnection control of each load circuit to meet the external power supply requirements and its own shutdown protection. However, the low-voltage lithium battery power management system has high requirements on the computing power of the local MCU. In addition, since L3 intelligent driving and wire-controlled chassis have functional safety requirements for 12V low-voltage lithium batteries, the MCU also needs to reach the Automotive Safety Integrity Level (ASIL) B level, which greatly increases the cost of the low-voltage lithium battery power management system, resulting in a large proportion of the cost of the low-voltage lithium battery power management system relative to the total cost of the low-voltage lithium battery. Therefore, there is an urgent need for a solution that can reduce the cost of the 12V low-voltage lithium battery power management system while meeting the performance requirements of the entire vehicle.

[0038] Based on the above problems, the present invention provides a low-voltage lithium battery power management system, including an analog front end (AnalogFront End, AFE) acquisition module, a MOS driver module, a MOS switch and a domain controller; an analog front end acquisition module supporting a daisy chain communication mode is used to send the collected current, voltage and temperature of the low-voltage lithium battery cell to the domain controller through the daisy chain communication mode, and the domain controller determines whether the low-voltage lithium battery is in an abnormal state through an internal algorithm logic; in combination with the current needs of the whole vehicle, when the low-voltage lithium battery is in an abnormal state, the MOS driver module is used to control the MOS switch to cut off the charge and discharge circuit in time to protect the safety of the low-voltage lithium battery and the whole vehicle; when the low-voltage lithium battery is not in an abnormal state, the MOS switch is controlled to charge and discharge normally, that is, the redundant computing power of the domain controller is fully utilized, and the daisy chain communication mode is used for communication instead of the MCU, therefore, the specifications of the analog front end acquisition module can be effectively reduced, and the hardware cost of the low-voltage lithium battery power management system can be greatly reduced on the premise of meeting the functional safety level of the whole vehicle.

[0039] The present invention is applicable to vehicles whose low-voltage batteries adopt lithium battery technology.

[0040] The technical solution of the present invention is described in detail below through specific embodiments. It should be noted that the following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0041] Figure 1 Schematic diagram of a low-voltage lithium battery power management system provided by an embodiment of the present invention. Figure 1 As shown, the low-voltage lithium battery power management system 100 of the embodiment of the present invention includes an analog front-end acquisition module 101, a MOS driver module 102, a MOS switch 103 and a domain controller 104. The analog front-end acquisition module 101 is respectively connected to the battery cell of the low-voltage lithium battery of the vehicle, the MOS driver module 102 and the domain controller 104; the MOS switch 103 is respectively connected to the MOS driver module 102, the battery cell of the low-voltage lithium battery, the domain controller 104, the high-low voltage converter of the vehicle and other power modules.

[0042] The analog front-end acquisition module 101 is used to collect the current, voltage and temperature of the battery cell, and send the current, voltage and temperature to the domain controller 104 via daisy chain communication.

[0043] The domain controller 104 is used to determine whether the low-voltage lithium battery is in an abnormal state based on the current, voltage and temperature; if so, it sends an instruction for cutting off the charge and discharge circuit to the analog front-end acquisition module 101 through a daisy chain communication method, so that the analog front-end acquisition module 101 controls the MOS switch 103 to cut off the charge and discharge circuit through the MOS driver module 102 according to the instruction; if not, it controls the MOS switch 103 so that the low-voltage lithium battery supplies power to the domain controller 104 and other power-consuming modules, and the high-voltage battery of the vehicle charges the low-voltage lithium battery through the high-low voltage converter.

[0044] In an embodiment of the present invention, the low-voltage lithium battery is, for example, a 12V low-voltage lithium battery, and the battery cell of the 12V low-voltage lithium battery is, for example, connected in parallel with four strings. The low-voltage lithium battery power management system 100 includes an analog front-end acquisition module 101, a MOS driver module 102, a MOS switch 103, and a domain controller 104. Among them, the analog front-end acquisition module 101, the MOS driver module 102, and the MOS switch 103 are, for example, located on a printed circuit board (PCB) of a vehicle; the analog front-end acquisition module 101 is respectively connected to the battery cell of the low-voltage lithium battery of the vehicle, the MOS driver module 102, and the domain controller 104; the MOS driver module 102 is connected to the MOS switch 103; the MOS switch 103 is also respectively connected to the battery cell of the low-voltage lithium battery, the domain controller 104, the high-low voltage converter of the vehicle, and other power modules. The high-voltage battery of the vehicle charges the low-voltage lithium battery through the high-low voltage converter, and other power modules include, for example, the wake-up controller, load controller, and load of the vehicle.

[0045] Optionally, when the analog front-end acquisition module 101 is used to collect the current, voltage and temperature of the battery cell, it can be specifically used to: collect current by cooperating with the vehicle's current measuring equipment; collect voltage through a circuit connected to the battery cell; and collect temperature through a temperature sensor integrated in the analog front-end acquisition module.

[0046] Exemplarily, when the analog front-end acquisition module 101 is used to collect the current of the battery cell, it can monitor the current of the battery cell by cooperating with the current measuring device of the vehicle. Among them, the current measuring device is, for example, a shunt or a Hall sensor. Taking the current measuring device as an example, when the current flows through the shunt, a voltage drop proportional to the current size will be generated on the shunt. The analog front-end acquisition module 101 can obtain the current size of the battery cell by measuring the voltage drop and then according to the resistance value of the shunt.

[0047] When the analog front-end acquisition module 101 is used to collect the voltage of the battery cell, it can monitor the voltage of each battery cell in real time through the circuit connected to the battery cell. Assuming that the battery cell of the low-voltage lithium battery adopts a one-in-four-in-one mode, the analog front-end acquisition module 101 can accurately measure the voltage of each battery cell and provide accurate voltage data for the low-voltage lithium battery power management system.

[0048] When the analog front-end acquisition module 101 is used to collect the temperature of the battery cell, the temperature of the battery cell can be monitored by a temperature sensor integrated in the analog front-end acquisition module 101. The temperature sensor can be, for example, a thermistor or other temperature sensitive element built into the analog front-end acquisition module 101. When the temperature of the battery cell changes, the resistance value or other characteristics of the temperature sensor will also change accordingly. The analog front-end acquisition module 101 obtains the temperature of the battery cell by measuring these changes.

[0049] Optionally, after the analog front-end acquisition module 101 acquires the current, voltage and temperature of the battery cell, it can pre-process the current, voltage and temperature; the pre-processing includes filtering, amplifying and differential signal conversion of the current, voltage and temperature. Among them, the differential signal conversion process is used to convert the current, voltage and temperature output by the battery cell from analog signals to differential signals, so as to transmit them to the domain controller 104 via daisy chain communication. For how to perform pre-processing specifically, please refer to the subsequent embodiments, which will not be repeated here.

[0050] In this embodiment, after the analog front-end acquisition module 101 acquires the current, voltage and temperature of the battery cell, it sends the current, voltage and temperature to the domain controller 104 through a daisy chain communication method. Correspondingly, the domain controller 104 receives the current, voltage and temperature of the battery cell sent by the analog front-end acquisition module 101. Based on the current, voltage and temperature, the domain controller 104 determines whether the low-voltage lithium battery is in an abnormal state. Abnormal states include, for example, over-discharge state, overheating state, overcharge state and overcurrent state, etc., and specific reference can be made to subsequent embodiments. If the domain controller 104 determines that the low-voltage lithium battery is in an abnormal state, it sends an instruction for cutting off the charge and discharge circuit to the analog front-end acquisition module 101 through a daisy chain communication method, so that the analog front-end acquisition module 101 controls the MOS switch 103 through the MOS driver module 102 to cut off the charge and discharge circuit according to the instruction to protect the safety of the low-voltage lithium battery and the vehicle. If the domain controller 104 determines that the low-voltage lithium battery is not in an abnormal state, the MOS switch 103 is controlled to allow the low-voltage lithium battery to power the domain controller 104 and other power-consuming modules, and the high-voltage battery of the vehicle charges the low-voltage lithium battery through the high-low voltage converter.

[0051] Optionally, the domain controller 104 can also be used to obtain the state of charge (SOC) and health state (SOH) of the low-voltage lithium battery and perform active or passive balancing on the battery cells. For details, please refer to subsequent embodiments and will not be repeated here.

[0052] A low-voltage lithium battery power management system provided by an embodiment of the present invention includes an analog front-end acquisition module, a MOS drive module, a MOS switch and a domain controller; the analog front-end acquisition module is used to collect the current, voltage and temperature of the battery cell, and send the current, voltage and temperature to the domain controller through a daisy chain communication method; the domain controller is used to determine whether the low-voltage lithium battery is in an abnormal state based on the current, voltage and temperature; if so, an instruction for cutting off the charge and discharge circuit is sent to the analog front-end acquisition module through a daisy chain communication method, so that the analog front-end acquisition module controls the MOS switch to cut off the charge and discharge circuit according to the instruction through the MOS drive module; if not, the MOS switch is controlled so that the low-voltage lithium battery supplies power to the domain controller and other power-consuming modules, and the high-voltage battery of the vehicle charges the low-voltage lithium battery through a high-low voltage converter. The embodiment of the present invention makes full use of the redundant computing power of the domain controller, and determines whether the low-voltage lithium battery is in an abnormal state based on the current, voltage and temperature of the battery cell sent by the analog front-end acquisition module through the daisy chain communication method; when the low-voltage lithium battery is in an abnormal state, the MOS switch is promptly controlled by the MOS driving module to cut off the charging and discharging circuit to protect the safety of the low-voltage lithium battery and the whole vehicle, and the MCU is no longer used. Therefore, the specifications of the analog front-end acquisition module can be effectively reduced. On the premise of meeting the functional safety level of the whole vehicle, the hardware cost of the low-voltage lithium battery power management system can be greatly reduced.

[0053] On the basis of the above embodiment, optionally, when the domain controller is used to determine whether the low-voltage lithium battery is in an abnormal state based on the current, voltage and temperature, it can be specifically used to: if the voltage is less than the voltage threshold or the SOC of the low-voltage lithium battery is less than the power threshold, it is determined that the low-voltage lithium battery is in an abnormal state, and the abnormal state is an over-discharge state.

[0054] Exemplarily, the voltage threshold and the power threshold can be set as needed, and the embodiments of the present invention do not limit this. In the process of the battery cell supplying power to the domain controller and other power-consuming modules, if the domain controller detects that the voltage of the battery cell is less than the voltage threshold or the SOC of the low-voltage lithium battery is less than the power threshold, it is determined that the low-voltage lithium battery is over-discharged. Therefore, an instruction for disconnecting the MOS switch is sent to the analog front-end acquisition module through a daisy chain communication method. After receiving the instruction, the analog front-end acquisition module disconnects the MOS switch through the MOS driver module to stop the battery cell from discharging to the outside.

[0055] Optionally, when the domain controller is used to determine whether the low-voltage lithium battery is in an abnormal state based on current, voltage and temperature, it can be specifically used to: if the temperature is greater than a temperature threshold, it is determined that the low-voltage lithium battery is in an abnormal state, and the abnormal state is an overheating state.

[0056] Exemplarily, the temperature threshold may be set as required, and the embodiment of the present invention is not limited to this.

[0057] The domain controller continuously monitors the temperature sent by the analog front-end acquisition module. If the detected temperature is greater than the temperature threshold, it is determined that the low-voltage lithium battery is overheated. Therefore, an instruction to disconnect the MOS switch is sent to the analog front-end acquisition module through daisy chain communication. After receiving the instruction, the analog front-end acquisition module disconnects the MOS switch through the MOS driver module to ensure that the temperature of the battery cell does not rise any more.

[0058] Optionally, during the process of the high-low voltage converter charging the battery cell, if the domain controller detects that the voltage of the high-low voltage converter is too large, such as exceeding 16 volts (V), it is determined that the low-voltage lithium battery is overcharged. Therefore, an instruction for disconnecting the MOS switch is sent to the analog front-end acquisition module through a daisy chain communication method. After receiving the instruction, the analog front-end acquisition module disconnects the MOS switch through the MOS driver module to cut off the charging of the low-voltage lithium battery by the high-low voltage converter.

[0059] Optionally, when a short circuit occurs in other power-consuming modules, a short-term large current (for example, 500 amperes) will be immediately generated in the power-consuming circuit. When the domain controller detects the abnormal large current, it determines that the low-voltage lithium battery is in an overcurrent state. Therefore, an instruction for disconnecting the MOS switch is sent to the analog front-end acquisition module through daisy chain communication. After receiving the instruction, the analog front-end acquisition module disconnects the MOS switch through the MOS driver module to protect the battery cell and the entire low-voltage lithium battery power management system.

[0060] Figure 2 Schematic diagram of a low-voltage lithium battery power management system provided by another embodiment of the present invention. Based on the above embodiment, the embodiment of the present invention further describes the low-voltage lithium battery power management system 100. Figure 2As shown, in the low-voltage lithium battery power management system 100 of the embodiment of the present invention, the analog front-end acquisition module 101 includes a filter 1011, an amplifier 1012 and a differential signal conversion submodule 1013; when the analog front-end acquisition module 101 is used to send current, voltage and temperature to the domain controller 104 via a daisy chain communication method, it is specifically used to: pre-process the collected current, voltage and temperature to obtain a pre-processed current, a pre-processed voltage and a pre-processed temperature, the pre-processing includes filtering the current, voltage and temperature through the filter 1011, amplifying the current, voltage and temperature through the amplifier 1012, and converting the current, voltage and temperature from analog signals to differential signals through the differential signal conversion submodule 1013; sending the pre-processed current, pre-processed voltage and pre-processed temperature to the domain controller 104 via a daisy chain communication method. When the domain controller 104 is used to determine whether the low-voltage lithium battery is in an abnormal state based on the current, voltage and temperature, it is specifically used to: determine whether the low-voltage lithium battery is in an abnormal state based on the pre-processed current, pre-processed voltage and pre-processed temperature; if so, send an instruction for cutting off the charge and discharge circuit to the analog front-end acquisition module 101 through a daisy chain communication method, so that the analog front-end acquisition module 101 controls the MOS switch 103 to cut off the charge and discharge circuit through the MOS driver module 102 according to the instruction; if not, control the MOS switch 103 so that the low-voltage lithium battery supplies power to the domain controller 104 and other power-consuming modules, and the high-voltage battery of the vehicle charges the low-voltage lithium battery through the high-low voltage converter.

[0061] Exemplarily, the current, voltage and temperature output by the battery cell are analog signals. Considering that the analog signals output by the battery cell collected by the analog front-end acquisition module 101 may contain some noise and interference, the analog front-end acquisition module 101 filters the collected current, voltage and temperature through the built-in filter 1011 to improve the signal-to-noise ratio of the analog signal. The filter 1011 can remove high-frequency noise and low-frequency interference in the analog signal, making the analog signal purer, and obtaining the filtered current, voltage and temperature for subsequent processing and analysis.

[0062] Considering that the analog signal output by the battery cell collected by the analog front-end acquisition module 101 may be relatively weak and needs to be amplified, the analog front-end acquisition module 101 amplifies the filtered current, voltage and temperature to appropriate amplitudes through the internal amplifier 1012 to obtain the amplified current, voltage and temperature for subsequent conversion and processing.

[0063] Considering that the daisy chain communication mode transmits differential signals, the analog front-end acquisition module 101 converts the amplified current, voltage and temperature into two signals with equal amplitudes but opposite phases, i.e., differential signals, through the differential signal conversion submodule 1013, thereby obtaining the pre-processed current, pre-processed voltage and pre-processed temperature, so as to facilitate transmission through the daisy chain communication mode. Among them, the differential signal conversion submodule 1013 is, for example, a differential amplifier or a differential driver.

[0064] After obtaining the pre-processed current, pre-processed voltage and pre-processed temperature, the analog front-end acquisition module 101 sends the pre-processed current, pre-processed voltage and pre-processed temperature to the domain controller 104 through a daisy chain communication method. Accordingly, the domain controller 104 determines whether the low-voltage lithium battery is in an abnormal state based on the pre-processed current, pre-processed voltage and pre-processed temperature; if so, an instruction for cutting off the charge and discharge circuit is sent to the analog front-end acquisition module 101 through a daisy chain communication method, so that the analog front-end acquisition module 101 controls the MOS switch 103 to cut off the charge and discharge circuit through the MOS driver module 102 according to the instruction; if not, the MOS switch 103 is controlled so that the low-voltage lithium battery supplies power to the domain controller 104 and other power modules, and the high-voltage battery of the vehicle charges the low-voltage lithium battery through the high-low voltage converter.

[0065] It can be understood that in the current signal transmission link, the analog signal output by the battery cell is usually converted into a digital signal, and then the digital signal is processed by the local MCU. It can also communicate with the upstream controller through the Controller Area Network (CAN) collector module, and the analog front-end acquisition module 101 in the embodiment of the present invention supports the daisy chain communication protocol, not the CAN communication protocol. By adopting the daisy chain communication protocol, the analog front-end acquisition module 101 can directly transmit the processed differential signal (pre-processed current, pre-processed voltage and pre-processed temperature) to the upstream domain controller 104 of the low-voltage lithium battery power management system through the daisy chain communication method, and no longer use the MCU, thereby achieving the purpose of reducing system costs.

[0066] The low-voltage lithium battery power management system provided by the embodiment of the present invention includes an analog front-end acquisition module, a MOS driving module, a MOS switch and a domain controller; wherein the analog front-end acquisition module includes a filter, an amplifier and a differential signal conversion submodule; the analog front-end acquisition module is used to collect the current, voltage and temperature of the battery cell, pre-process the collected current, voltage and temperature to obtain the pre-processed current, pre-processed voltage and pre-processed temperature, which can improve the accuracy of the collected data; the pre-processing includes filtering the current, voltage and temperature through a filter, amplifying the current, voltage and temperature through an amplifier, and converting the current, voltage and temperature from analog signals to differential signals through a differential signal conversion submodule; and sending the pre-processed current, pre-processed voltage and pre-processed temperature to the domain controller through a daisy chain communication method. The domain controller is used to determine whether the low-voltage lithium battery is in an abnormal state based on the pre-processed current, pre-processed voltage and pre-processed temperature; if so, an instruction for cutting off the charge and discharge circuit is sent to the analog front-end acquisition module through a daisy chain communication method, so that the analog front-end acquisition module controls the MOS switch to cut off the charge and discharge circuit according to the instruction through the MOS driver module; if not, the MOS switch is controlled so that the low-voltage lithium battery supplies power to the domain controller and other power-consuming modules, and the high-voltage battery of the vehicle charges the low-voltage lithium battery through the high-low voltage converter. The embodiment of the present invention makes full use of the redundant computing power of the domain controller, and accurately determines whether the low-voltage lithium battery is in an abnormal state based on the pre-processed current, pre-processed voltage and pre-processed temperature sent by the analog front-end acquisition module through the daisy chain communication method; when the low-voltage lithium battery is in an abnormal state, the MOS switch is promptly controlled by the MOS driver module to cut off the charge and discharge circuit to protect the safety of the low-voltage lithium battery and the whole vehicle, and the MCU is no longer used. Therefore, the specifications of the analog front-end acquisition module can be effectively reduced, and the hardware cost of the low-voltage lithium battery power management system can be greatly reduced on the premise of meeting the functional safety level of the whole vehicle.

[0067] Based on the above embodiments, the domain controller is also used for at least one of the following: obtaining the charge state of the low-voltage lithium battery based on current, voltage, temperature and time; obtaining the health status of the low-voltage lithium battery based on current, voltage, temperature, internal resistance of the low-voltage lithium battery and number of charge and discharge cycles; performing active or passive balancing of the battery cells based on current, voltage and temperature.

[0068] Exemplarily, after the domain controller receives the current, voltage and temperature of the battery cell sent by the analog front-end acquisition module, it can use its own redundant computing power to implement the logic algorithm for the low-voltage lithium battery. Specifically, the domain controller can use a specific algorithm (such as open circuit voltage method and model estimation method, etc.) to obtain the SOC of the low-voltage lithium battery based on current, voltage, temperature and time. Among them, SOC refers to the ratio of the current remaining power of the battery to the total capacity of the battery, which is an important indicator for measuring the remaining power of the battery. By accurately calculating the SOC of the low-voltage lithium battery, the low-voltage lithium battery power management system can understand the remaining power of the low-voltage lithium battery in real time and provide users with accurate power information.

[0069] The domain controller can also use specific algorithms (such as internal resistance method and cycle life method, etc.) to obtain the SOH of the low-voltage lithium battery based on current, voltage, temperature, internal resistance of the low-voltage lithium battery and the number of charge and discharge cycles. Among them, SOH refers to the ratio of the current performance of the battery to the performance of the new battery, reflecting the aging degree and performance degradation of the battery. By evaluating the SOH of the low-voltage lithium battery, the low-voltage lithium battery power management system can promptly discover potential problems of the low-voltage lithium battery, predict the service life of the low-voltage lithium battery, and provide a basis for the maintenance and replacement of the low-voltage lithium battery.

[0070] It can be understood that in a low-voltage lithium battery pack, since the performance and usage of each battery cell may be different, there will be differences in parameters such as voltage and capacity between the battery cells. In order to ensure the overall performance and service life of the low-voltage lithium battery pack, the domain controller can start the vehicle's balancing module to balance the various batteries of the low-voltage lithium battery. The balancing control method includes, for example, active balancing and passive balancing. Among them, active balancing is to transfer the excess power of the battery cell with higher voltage to the battery cell with lower voltage by energy transfer, so as to achieve energy balance between the battery cells; passive balancing is to connect resistors between the battery cells, and consume the excess power of the battery cell with higher voltage through the resistor, so as to balance the voltage between the battery cells. In this embodiment, a specific algorithm (such as a capacitor transfer method, etc.) can be used to actively balance the battery cells based on current, voltage and temperature, or a specific algorithm (such as a resistor discharge method, etc.) can be used to passively balance the battery cells.

[0071] Based on the above embodiments, Figure 3 The flowchart of the low-voltage lithium battery power management method provided in one embodiment of the present invention is applied to the low-voltage lithium battery power management system in any of the above embodiments. Figure 3 As shown, the method of the embodiment of the present invention includes:

[0072] S301, the analog front-end acquisition module collects the current, voltage and temperature of the battery cell of the low-voltage lithium battery, and sends the current, voltage and temperature to the domain controller through daisy chain communication.

[0073] Exemplarily, the low-voltage lithium battery is, for example, a 12V low-voltage lithium battery, and the battery cell of the 12V low-voltage lithium battery is, for example, connected in parallel with four strings. The analog front-end acquisition module can collect current by cooperating with the vehicle's current measurement device; collect voltage through a circuit connected to the battery cell; and collect temperature through a temperature sensor integrated in the analog front-end acquisition module. The analog front-end acquisition module converts the collected current, voltage, and temperature into corresponding differential signals and sends them to the domain controller via a daisy chain communication method.

[0074] S302. The domain controller determines whether the low-voltage lithium battery is in an abnormal state based on the current, voltage and temperature; if so, it sends an instruction for cutting off the charge and discharge circuit to the analog front-end acquisition module through the daisy chain communication method, so that the analog front-end acquisition module controls the MOS switch through the MOS driver module to cut off the charge and discharge circuit according to the instruction; if not, it controls the MOS switch so that the low-voltage lithium battery supplies power to the domain controller and other power-consuming modules, and the high-voltage battery of the vehicle charges the low-voltage lithium battery through the high-low voltage converter.

[0075] Exemplarily, after receiving the current, voltage and temperature sent by the analog front-end acquisition module, the domain controller determines whether the low-voltage lithium battery is in an abnormal state based on the current, voltage and temperature. The abnormal state includes, for example, over-discharge state, overheat state, overcharge state and overcurrent state. If the domain controller determines that the low-voltage lithium battery is in an abnormal state, it sends an instruction for cutting off the charge and discharge circuit to the analog front-end acquisition module through a daisy chain communication method, so that the analog front-end acquisition module controls the MOS switch to cut off the charge and discharge circuit through the MOS driver module according to the instruction to protect the safety of the low-voltage lithium battery and the vehicle. If the domain controller determines that the low-voltage lithium battery is not in an abnormal state, it controls the MOS switch so that the low-voltage lithium battery supplies power to the domain controller and other power modules, and the high-voltage battery of the vehicle charges the low-voltage lithium battery through the high-low voltage converter.

[0076] The low-voltage lithium battery power management method provided by the embodiment of the present invention collects the current, voltage and temperature of the battery cell of the low-voltage lithium battery through an analog front-end acquisition module, and sends the current, voltage and temperature to the domain controller through a daisy chain communication method; the domain controller determines whether the low-voltage lithium battery is in an abnormal state based on the current, voltage and temperature; if so, an instruction for cutting off the charge and discharge circuit is sent to the analog front-end acquisition module through a daisy chain communication method, so that the analog front-end acquisition module controls the MOS switch to cut off the charge and discharge circuit through the MOS driving module according to the instruction; if not, the MOS switch is controlled so that the low-voltage lithium battery supplies power to the domain controller and other power-consuming modules, and the high-voltage battery of the vehicle charges the low-voltage lithium battery through the high-low voltage converter. The embodiment of the present invention makes full use of the redundant computing power of the domain controller, and determines whether the low-voltage lithium battery is in an abnormal state based on the current, voltage and temperature of the battery cell sent by the analog front-end acquisition module through the daisy chain communication method; when the low-voltage lithium battery is in an abnormal state, the MOS switch is promptly controlled by the MOS driving module to cut off the charging and discharging circuit to protect the safety of the low-voltage lithium battery and the whole vehicle, and the MCU is no longer used. Therefore, the specifications of the analog front-end acquisition module can be effectively reduced. On the premise of meeting the functional safety level of the whole vehicle, the hardware cost of the low-voltage lithium battery power management system can be greatly reduced.

[0077] On the basis of the above-mentioned embodiment of the low-voltage lithium battery power management method, further, the analog front-end acquisition module preprocesses the collected current, voltage and temperature to obtain the preprocessed current, preprocessed voltage and preprocessed temperature, and the preprocessing includes filtering the current, voltage and temperature through the filter in the analog front-end acquisition module, amplifying the current, voltage and temperature through the amplifier in the analog front-end acquisition module, and converting the current, voltage and temperature from analog signals to differential signals through the differential signal conversion submodule in the analog front-end acquisition module; sending the preprocessed current, preprocessed voltage and preprocessed temperature to the domain controller through the daisy chain communication mode.

[0078] Further, the domain controller determines whether the low-voltage lithium battery is in an abnormal state based on the pre-processed current, the pre-processed voltage, and the pre-processed temperature.

[0079] Furthermore, the low-voltage lithium battery power management method also includes at least one of the following: the domain controller obtains the SOC of the low-voltage lithium battery based on current, voltage, temperature and time; the domain controller obtains the SOH of the low-voltage lithium battery based on current, voltage, temperature, internal resistance and number of charge and discharge cycles of the low-voltage lithium battery; the domain controller performs active or passive balancing on the battery cells based on current, voltage and temperature.

[0080] Further, if the voltage is less than the voltage threshold or the SOC of the low-voltage lithium battery is less than the power threshold, the domain controller determines that the low-voltage lithium battery is in an abnormal state, and the abnormal state is an over-discharge state.

[0081] Further, if the temperature is greater than the temperature threshold, the domain controller determines that the low-voltage lithium battery is in an abnormal state, and the abnormal state is an overheating state.

[0082] Furthermore, the analog front-end acquisition module collects current by cooperating with the vehicle's current measuring device; the analog front-end acquisition module collects voltage through a circuit connected to the battery cell; and the analog front-end acquisition module collects temperature through a temperature sensor integrated in the analog front-end acquisition module.

[0083] The low-voltage lithium battery power management method provided in the embodiment of the present invention can be applied to the low-voltage lithium battery power management system in any of the above embodiments, and its implementation principle and technical effect are similar.

[0084] The present invention also provides a vehicle, comprising a vehicle body, front wheels and rear wheels, wherein the vehicle body is arranged between the front wheels and the rear wheels; the vehicle also includes a low-voltage lithium battery power management system as described above in the embodiment of the present invention, which is arranged on the vehicle body.

[0085] Figure 4 This is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. Figure 4 As shown, the electronic device 400 may include: at least one processor 401 and a memory 402 .

[0086] The memory 402 is used to store programs. Specifically, the programs may include program codes, and the program codes include computer-executable instructions.

[0087] The memory 402 may include a high-speed random access memory (RAM), and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0088] The processor 401 is used to execute the computer-executable instructions stored in the memory 402 to implement the low-voltage lithium battery power management method described in the aforementioned method embodiment. Among them, the processor 401 may be a central processing unit (CPU), or an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention. Specifically, when implementing the low-voltage lithium battery power management method described in the aforementioned method embodiment, the electronic device may be, for example, a domain controller of a vehicle.

[0089] Optionally, the electronic device 400 may further include a communication interface 403. In a specific implementation, if the communication interface 403, the memory 402 and the processor 401 are implemented independently, the communication interface 403, the memory 402 and the processor 401 may be interconnected through a bus and communicate with each other. The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc., but it does not mean that there is only one bus or one type of bus.

[0090] Optionally, in a specific implementation, if the communication interface 403, the memory 402 and the processor 401 are integrated on a chip, the communication interface 403, the memory 402 and the processor 401 can communicate through an internal interface.

[0091] The present invention also provides a computer-readable storage medium, in which computer program instructions are stored. When a processor executes the computer program instructions, the above-mentioned low-voltage lithium battery power management method is implemented.

[0092] The present invention also provides a computer program product, including a computer program, which implements the above-mentioned low-voltage lithium battery power management method when executed by a processor.

[0093] The computer-readable storage medium mentioned above can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read only memory (EEPROM), erasable programmable read only memory (EPROM), programmable read only memory (PROM), read only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk. The readable storage medium can be any available medium that can be accessed by a general or special-purpose computer.

[0094] An exemplary readable storage medium is coupled to a processor so that the processor can read information from the readable storage medium and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can be located in a dedicated integrated circuit. Of course, the processor and the readable storage medium can also exist as discrete components in the low-voltage lithium battery power management system.

[0095] Those skilled in the art can understand that all or part of the steps of implementing the above-mentioned method embodiments can be completed by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the steps of the above-mentioned method embodiments are executed; and the aforementioned storage medium includes: ROM, RAM, disk or optical disk and other media that can store program codes.

[0096] Finally, it should be noted that the above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or change made by a person skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. A low voltage lithium battery power management system, characterized in that: include: Analog front-end acquisition module, MOS driver module, MOS switch and domain controller; The analog front-end acquisition module is respectively connected to the battery cell of the low-voltage lithium battery of the vehicle, the MOS driving module and the domain controller; the MOS switch is respectively connected to the MOS driving module, the battery cell of the low-voltage lithium battery, the domain controller, the high-low voltage converter of the vehicle and other power modules; The analog front-end acquisition module is used to collect the current, voltage and temperature of the battery cell, and send the current, voltage and temperature to the domain controller via a daisy chain communication method; The domain controller is used to determine whether the low-voltage lithium battery is in an abnormal state based on the current, the voltage and the temperature; if so, an instruction for cutting off the charge and discharge circuit is sent to the analog front-end acquisition module through the daisy chain communication method, so that the analog front-end acquisition module controls the MOS switch to cut off the charge and discharge circuit through the MOS driving module according to the instruction; if not, the MOS switch is controlled so that the low-voltage lithium battery supplies power to the domain controller and the other power-consuming modules, and the high-voltage battery of the vehicle charges the low-voltage lithium battery through the high-low voltage converter.

2. The low-voltage lithium battery power management system according to claim 1, characterized in that: The analog front-end acquisition module includes a filter, an amplifier, and a differential signal conversion submodule; when the analog front-end acquisition module is used to send the current, the voltage, and the temperature to the domain controller through a daisy chain communication mode, it is specifically used to: Preprocessing the collected current, voltage and temperature to obtain a preprocessed current, a preprocessed voltage and a preprocessed temperature, wherein the preprocessing includes filtering the current, voltage and temperature through the filter, amplifying the current, voltage and temperature through the amplifier, and converting the current, voltage and temperature from analog signals to differential signals through the differential signal conversion submodule; The preprocessed current, the preprocessed voltage, and the preprocessed temperature are sent to the domain controller via a daisy chain communication method.

3. The low-voltage lithium battery power management system according to claim 2, characterized in that: When the domain controller is used to determine whether the low-voltage lithium battery is in an abnormal state based on the current, the voltage and the temperature, it is specifically used to: Based on the pre-processed current, the pre-processed voltage and the pre-processed temperature, it is determined whether the low-voltage lithium battery is in an abnormal state.

4. The low-voltage lithium battery power management system according to any one of claims 1 to 3, characterized in that: The domain controller is also used for at least one of the following: Based on the current, the voltage, the temperature and the time, obtaining a state of charge of the low-voltage lithium battery; Obtaining a health status of the low-voltage lithium battery based on the current, the voltage, the temperature, the internal resistance of the low-voltage lithium battery, and the number of charge and discharge cycles; Based on the current, the voltage and the temperature, active balancing or passive balancing is performed on the battery cell.

5. The low-voltage lithium battery power management system according to claim 4, characterized in that: When the domain controller is used to determine whether the low-voltage lithium battery is in an abnormal state based on the current, the voltage and the temperature, it is specifically used to: If the voltage is less than a voltage threshold or the state of charge of the low-voltage lithium battery is less than a power threshold, it is determined that an abnormal state occurs in the low-voltage lithium battery, and the abnormal state is an over-discharge state.

6. The low-voltage lithium battery power management system according to any one of claims 1 to 3, characterized in that: When the domain controller is used to determine whether the low-voltage lithium battery is in an abnormal state based on the current, the voltage and the temperature, it is specifically used to: If the temperature is greater than the temperature threshold, it is determined that the low-voltage lithium battery is in an abnormal state, and the abnormal state is an overheating state.

7. The low-voltage lithium battery power management system according to any one of claims 1 to 3, characterized in that: When the analog front-end acquisition module is used to collect the current, voltage and temperature of the battery cell, it is specifically used to: Collecting the current by cooperating with a current measuring device of the vehicle; collecting the voltage through a circuit connected to the battery cell; The temperature is collected by a temperature sensor integrated in the analog front-end collection module.

8. A low-voltage lithium battery power management method, the low-voltage lithium battery power management method is applied to the low-voltage lithium battery power management system according to any one of claims 1 to 7, the low-voltage lithium battery power management method comprising: The analog front-end acquisition module acquires the current, voltage and temperature of the battery cell of the low-voltage lithium battery, and sends the current, voltage and temperature to the domain controller through a daisy chain communication method; The domain controller determines whether the low-voltage lithium battery is in an abnormal state based on the current, the voltage and the temperature; If so, an instruction for cutting off the charge and discharge circuit is sent to the analog front-end acquisition module through the daisy chain communication method, so that the analog front-end acquisition module controls the MOS switch to cut off the charge and discharge circuit through the MOS driving module according to the instruction; if not, the MOS switch is controlled so that the low-voltage lithium battery supplies power to the domain controller and other power-consuming modules, and the high-voltage battery of the vehicle charges the low-voltage lithium battery through the high-low voltage converter.

9. A vehicle, characterized in that: The vehicle comprises a vehicle body, front wheels and rear wheels, wherein the vehicle body is arranged between the front wheels and the rear wheels; the vehicle also comprises a low-voltage lithium battery power management system as claimed in any one of claims 1 to 7 arranged on the vehicle body.

10. An electronic device, characterized in that: include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the low-voltage lithium battery power management method as claimed in claim 8.

11. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed, the low-voltage lithium battery power management method as claimed in claim 8 is implemented.

12. A computer program product, comprising a computer program, characterized in that When the computer program is executed, the low-voltage lithium battery power management method as claimed in claim 8 is implemented.

Images