CN115015743A - Relay aging prediction method and system for automobile power battery and automobile - Google Patents
Relay aging prediction method and system for automobile power battery and automobile Download PDFInfo
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Abstract
The invention discloses a relay aging prediction method and a system of an automobile power battery and an automobile, wherein the method comprises the steps of obtaining a battery current signal of the power battery and a whole automobile load current signal of the automobile after starting a preset stabilization time threshold of the power battery; when the working state of a relay of the power battery is detected to be changed in real time, according to the load current signal of the whole vehicle and the current signal of the battery, an aging numerical value corresponding to the relay is inquired from a preset relay life table; acquiring an aging numerical value accumulated value of the relay; and carrying out aging prediction on the relay according to the aging numerical value accumulated value. The invention improves the accuracy of the aging prediction of the service life of the relay, and improves the user experience and the safety.
Description
Technical Field
The invention relates to the field of relay aging prediction, in particular to a method and a system for predicting relay aging of an automobile power battery and an automobile.
Background
In the use process of the electric automobile, a relay in a power battery of the electric automobile needs to be opened or closed, so that high-voltage power-on and power-off of the electric automobile are realized; however, as the service life of the relay is longer, the relay is likely to fail, and a high-voltage circuit is formed in the power battery or the electric vehicle loses power, so that it is very important to predict the aging of the relay of the power battery.
In the prior art, a battery management system is used for monitoring voltages at two ends of a battery pack in a power battery pack, and a terminal voltage after passing through a relay and a relay state return detection signal fed back by bottom layer software are used for predicting the service life of the relay. However, this solution has the following disadvantages: because the terminal voltage passing through the relay has the problem of sampling precision and the variation fluctuation range of the terminal voltage is large, the accuracy rate of the aging prediction of the service life of the relay is low.
Disclosure of Invention
The embodiment of the invention provides a method and a system for predicting the aging of a relay of an automobile power battery and an automobile, and aims to solve the problem of low accuracy of the aging prediction of the service life of the relay.
A relay aging prediction method for an automobile power battery comprises the following steps:
after a preset stabilization time threshold value of a power battery is started, acquiring a battery current signal of the power battery and a finished automobile load current signal of an automobile;
when the working state of a relay of the power battery is detected to be changed in real time, according to the load current signal of the whole vehicle and the current signal of the battery, an aging numerical value corresponding to the relay is inquired from a preset relay life table;
acquiring an aging numerical value accumulated value of the relay;
and carrying out aging prediction on the relay according to the aging numerical value accumulated value.
A relay aging prediction system of an automobile power battery comprises the automobile power battery and a control module used for executing the relay aging prediction method of the automobile power battery.
An automobile comprises the relay aging prediction system of the automobile power battery.
According to the relay aging prediction method and system for the automobile power battery and the automobile, after the preset stability time threshold value of the power battery is started, a battery current signal of the power battery and a finished automobile load current signal of the automobile are obtained; when the working state of a relay of the power battery is detected to be changed in real time, according to the load current signal of the whole vehicle and the current signal of the battery, an aging numerical value corresponding to the relay is inquired from a preset relay life table; acquiring an aging numerical value accumulated value of the relay; the aging numerical value accumulated value is the accumulated value of the corresponding aging numerical value when the working state of the relay is changed every time after the relay is installed in the power battery; and carrying out aging prediction on the relay according to the aging numerical value accumulated value.
When the working state of each relay of the power battery is detected to be changed, the aging prediction of the service life of the relay is carried out according to the aging numerical value corresponding to the current value when the working state is changed every time, so that the aging prediction accuracy of the service life of the relay is improved; furthermore, whether the relay fails due to service life aging can be predicted in advance, the probability that a high-voltage loop is formed in the power battery or the power of the electric automobile is lost is reduced, and user experience and battery safety are improved.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a flowchart of a method for predicting relay aging of an automotive power battery according to an embodiment of the present invention;
FIG. 2 is a flowchart of step S10 of the method for predicting the aging of the relay of the vehicle power battery according to an embodiment of the present invention;
FIG. 3 is a flowchart of step S20 of the method for predicting the aging of the relay of the vehicle power battery according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating the method for predicting the aging of the relay of the vehicle power battery according to the embodiment of the present invention at step S40;
FIG. 5 is a schematic diagram of a computer device according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
In one embodiment, as shown in fig. 1, a method for predicting the aging of a relay of an automotive power battery is provided, which includes the following steps:
s10: and after a preset stable time threshold value for starting the power battery is reached, acquiring a battery current signal of the power battery and a finished automobile load current signal of an automobile.
It can be understood that, no matter in the charging or discharging state of the power Battery, the cell voltage and the module temperature of the power Battery can be accurately obtained from the BMS (Battery Management System) after the power Battery is powered on and a preset stabilization time threshold is passed. Alternatively, the preset settling time threshold may be 0.4s, 0.5s, etc. Preferably, the power battery is a power battery mounted on an electric vehicle, and the power battery may be a lithium ion battery or the like.
Furthermore, the battery current signal comprises a charging current signal and a discharging current signal of the power battery, and the battery current signal can be obtained by collecting the current value of the power battery through a Hall sensor in the power battery. The whole vehicle load current signal refers to the current value of other load devices (such as the current value when a heater on the vehicle is heated) in the vehicle except for the power battery, and is a signal received from a whole vehicle control system through vehicle CAN communication.
In an embodiment, the step S10, namely the acquiring the battery current signal of the power battery, includes:
acquiring an initial current signal of the power battery in real time, and preprocessing the initial current signal after determining that the initial current signal is effective to obtain the battery current signal.
Understandably, after the power battery enters a stable state, acquiring an initial current signal of the power battery through a Hall sensor in the power battery, transmitting the initial current signal to a BMS through CAN communication, and verifying the sampling precision and the sampling period of the initial current signal to determine whether the acquired initial current signal meets the system requirements; after the initial current signal is determined to meet the sampling precision and the sampling period, validity diagnosis is performed on the initial current signal, for example, overrun diagnosis, open circuit diagnosis and the like are performed on the initial current signal, so that after the initial current signal is determined to be valid, preprocessing such as signal conversion, filtering and the like is performed on the initial current signal, and then the battery current signal is obtained.
In an embodiment, the step S10 further includes, that is, the acquiring a battery current signal of the power battery and a vehicle load current signal of the vehicle includes:
s101: and detecting whether the message transmission signal related to the load current signal of the whole vehicle is interrupted.
It CAN be understood that the vehicle load current signal is a signal received from the vehicle control system through the vehicle CAN communication, so that before the vehicle load current signal at the current moment is obtained, it is required to detect whether a message transmission signal associated with the vehicle load current signal is interrupted, that is, whether the CAN communication between the control module and the vehicle control system is interrupted, and when the message transmission signal is interrupted, the control module cannot receive the vehicle load current signal sent by the vehicle control system through the CAN communication at the current moment; when the message transmission signal is not interrupted, the load current signal of the whole vehicle sent by the whole vehicle control system through CAN communication at the current moment CAN be received.
S102: and when the message transmission signal related to the finished automobile load current signal is not interrupted, recording the load current signal contained in the current message transmission signal as the finished automobile load current signal.
Specifically, after detecting whether a message transmission signal associated with a load current signal of the entire vehicle is interrupted or not, when the message transmission signal associated with the load current signal of the entire vehicle is not interrupted, the message transmission signal currently sent by a control system of the entire vehicle is received through vehicle CAN communication, and then the load current signal contained in the message transmission signal is recorded as the load current signal of the entire vehicle.
S103: when the message transmission signal related to the whole vehicle load current signal is interrupted, recording the load current signal contained in the last message transmission signal before interruption as the whole vehicle load current signal, or recording the whole vehicle load current signal as zero.
Specifically, after detecting whether a message transmission signal associated with a load current signal of the entire vehicle is interrupted or not, when the message transmission signal associated with the load current signal of the entire vehicle is interrupted, a load current signal contained in the last message transmission signal before interruption is recorded as the load current signal of the entire vehicle, or the load current signal of the entire vehicle is recorded as zero.
S20: when the working state of a relay of the power battery is detected to be changed in real time, according to the load current signal of the whole vehicle and the current signal of the battery, an aging numerical value corresponding to the relay is inquired from a preset relay life table.
It is understood that the operating state refers to the on state and the off state of the relay, and the change of the operating state refers to the switching between the on state and the off state. The relay of the power battery includes, but is not limited to, main positive relay, main negative relay, pre-charging relay, and the like.
The preset relay life table stores aging values corresponding to various types of relays, one aging value corresponds to one current value, that is, after the current value of a relay is determined according to a vehicle-mounted load current signal and a battery current signal, the aging value corresponding to the current value of the relay can be inquired through the preset relay life table. Further, the preset relay life table is generated according to the times of change of theoretical working states of the relays under different currents and recommended values in a factory specification of a relay supplier. For example, the number of times of change of the theoretical operating state refers to that, after the number of times of change of the operating state of the relay is set to 1000 times under a certain current, the aging condition of the relay is considered to occur, and therefore, a preset relay life table can be generated according to the current value corresponding to the aging condition and the recommended value in the factory specification of the relay supplier.
Specifically, after acquiring a battery current signal of the power battery and a finished automobile load current signal of an automobile, detecting whether the working state of a relay of the power battery changes or not in real time, when the working state of the relay is detected to change, determining a current value corresponding to the relay according to the finished automobile load current signal and the battery current signal, and inquiring an aging numerical value corresponding to the relay from a preset relay life table.
It can be understood that the change of the working state of the relay of the power battery can be executed after receiving the change of the working state of the relay; for example, after the power battery reaches the preset charging requirement, a charging completion is received, a charging relay command is cut off, and then the connection between the charging relay and the power battery is cut off. Further, since there is a time difference between the time when the working state of the relay is changed and the time when the working state change instruction of the relay is received, when the working state of the relay of the power battery is detected to be changed, the maximum battery current signal in the preset period (one or more battery current signals may be periodically collected in the preset period) should be selected as the basis for querying in the preset relay life table.
In an embodiment, in step S20, that is, the querying, according to the entire vehicle load current signal and the battery current signal, an aging value corresponding to the relay from a preset relay life table includes:
s201: when the relay with the changed working state is determined to be the charging relay in the power battery, recording the sum of the charging current and the load current of the whole vehicle as a first current value, and recording the difference between the first current value and the discharging current as a second current value.
It can be understood that, when the relay which detects that the working state changes in real time is the charging relay, because the charging relay changes the working state, the corresponding state of the current power battery may be: the charging equipment is connected with the power battery through the charging relay switched to the on state and starts to charge the power battery, or the power battery is just charged, so that the connection between the charging equipment and the charging equipment is cut off through the charging relay switched to the off state, or the connection between the charging equipment and the charging equipment is cut off through the charging relay switched to the off state, so that the charging of the power battery is interrupted, and the like; at this time, the current of the charging relay should be calculated according to the charging current, the discharging current and the entire vehicle load current, that is, the sum of the charging current and the entire vehicle load current is recorded as a first current value, and the difference between the first current value and the discharging current is recorded as a second current value corresponding to the charging relay.
S202: and acquiring a first aging numerical value associated with the second current value from the preset relay life table, and recording the first aging numerical value as the aging numerical value of the charging relay.
The relay life table comprises a preset relay life table, a plurality of relays, a plurality of charging relays, a plurality of discharging relays, a plurality of relays and a plurality of relays, wherein the preset relay life table stores aging values corresponding to the relays, one aging value corresponds to one current value, each different relay has an associated preset relay life table, then when the relay which detects that the working state changes in real time is the charging relay, the sum of the charging current and the load current of the whole vehicle is recorded as a first current value, the difference between the first current value and the discharging current is recorded as a second current value of the charging relay, the preset relay life table which is associated with the charging relay is obtained, the first aging value which is associated with the second current value is obtained from the preset relay life table, and the first aging value is recorded as the aging value of the charging relay.
In an embodiment, in step S20, that is, according to the entire vehicle load current signal and the battery current signal, querying an aging value corresponding to the relay from a preset relay life table further includes:
and when the relay with the changed working state is confirmed to be other relays except the charging relay in the power battery, acquiring a second aging numerical value associated with the discharging current from the preset relay life table, and recording the second aging numerical value as the aging numerical values of the other relays.
It can be understood that when the relay whose working state is changed is determined to be another relay in the power battery except the charging relay, for example, when the current power battery is in a non-charging state, the working state of the charging relay does not change, but the working states of other relays, such as a main positive relay, a main negative relay, etc., change, and then it is not necessary to consider the charging current and the load current of the entire vehicle at this time, and after determining which specific type of relay has changed its working state, a second aging value associated with the discharging current is obtained from a preset relay life table associated with the relay whose working state has changed, and the second aging value is recorded as the aging value of the relay.
S30: and acquiring an aging numerical value accumulated value of the relay.
As can be understood, for the electric vehicle, the working state of the relay in the power battery is changed (that is, when the relay is switched between the on state and the off state), so as to implement the functions of powering on, powering off, charging and the like of the entire vehicle high voltage of the electric vehicle; however, each time the working state of the relay is changed, the service life aging of the relay is affected, and when the working state is changed, if current exists, the larger the current value is, the larger the influence on the service life aging of the relay is, so the invention predicts the service life aging of the relay through the battery current signal when each time the working state of the relay is changed and the load current signal of the whole vehicle. The aging numerical value accumulated value is the accumulated value of the corresponding aging numerical value when the working state of the relay is changed every time after the relay is installed in the power battery.
Furthermore, in order to facilitate debugging of each relay of the power battery, an external interface is reserved in the automobile, and the external interface is used for performing zero clearing processing on the aging value accumulated value corresponding to the relay of the type after any relay is replaced.
S40: and carrying out aging prediction on the relay according to the aging numerical value accumulated value. Specifically, step S40 includes:
s401: acquiring a preset aging parameter design table; and the preset aging parameter design table stores aging parameter design values related to the relay.
It is to be understood that, in step S20, a preset relay life table is provided, which is used to look up the aging value corresponding to the relay, and is generated according to the number of times that the theoretical operating state of each relay changes at different currents and the recommended value in the factory specification of the relay supplier. Further, the preset aging parameter design table in this embodiment may be generated according to the preset relay life table in step S20, that is, the preset aging parameter design table may be obtained by performing an aging test on the relay in advance; illustratively, an aging test is performed on a charging relay of the power battery, and after the number of times that the working state of the charging relay is changed reaches 1000 times, the aging condition of the relay is considered to occur, so that the aging value of the current charging relay is obtained and recorded as the aging parameter design value corresponding to the charging relay.
S402: and recording the ratio of the aging numerical value accumulated value to the aging parameter design value as an aging ratio.
S403: and when the aging ratio is greater than or equal to the first aging threshold and smaller than the second aging threshold, sending a relay aging replacement alarm instruction to a preset receiver, wherein the first aging threshold is smaller than the second aging threshold.
Understandably, when the service life of the relay is seriously aged, the relay may be out of work (for example, the relay cannot be normally opened or closed), so that a high-voltage loop is formed in the power battery or the power of the electric vehicle is lost. Optionally, the first aging threshold may be set to 80% of the corresponding aging value when the relay fails; the second aging threshold may be set to 90% of the corresponding aging value when the relay fails.
Specifically, after recording the ratio between the aging numerical value accumulated value and the aging parameter design value as an aging ratio, comparing the aging ratio with a first aging threshold and a second aging threshold, when the aging ratio is greater than or equal to the first aging threshold and smaller than the second aging threshold, determining that the aging state of the current service life of the relay reaches an alarm value, displaying the name of the relay reaching the alarm value on a display device (such as an instrument panel, an external display screen and the like) of the automobile, displaying the lighting of a lighting assembly on the automobile, and sending an aging replacement alarm instruction of the relay to a preset receiver. The preset receiver can be an owner of the automobile.
In an embodiment, after step S402, that is, after recording the ratio between the accumulated aging value and the design aging parameter value as the aging ratio, the method further includes:
and when the aging ratio is smaller than the first aging threshold value, confirming that the relay does not need to be replaced currently.
Specifically, after the ratio between the aging numerical value accumulated value and the aging parameter design value is recorded as an aging ratio, when the aging ratio is smaller than a first aging threshold, the service life of the relay does not reach an alarm value, that is, the relay can still work normally, and it can be confirmed that the relay does not need to be replaced currently.
In an embodiment, after step S402, that is, after recording the ratio between the accumulated aging value and the design aging parameter value as the aging ratio, the method further includes:
and when the aging ratio is greater than or equal to the second aging threshold, sending a relay severe aging instruction to the preset receiver, and switching off the relay to control the power battery to be switched off.
Specifically, after the ratio between the aging numerical value accumulated value and the aging parameter design value is recorded as an aging ratio, when the aging ratio is greater than or equal to the second aging threshold, it is characterized that the current relay is seriously aged and needs to be replaced, so that the relay is prevented from being out of service due to serious aging, and further a high-voltage loop is formed in a power battery or the electric vehicle is prevented from losing power; therefore, a relay severe aging instruction is sent to the preset receiver at the moment, and the connection between the relay and the power battery is cut off to control the power battery to be closed, so that high-voltage power failure is caused, and the automobile stops running.
In the embodiment, when the working state of each relay of the power battery is detected to change, the aging prediction of the service life of the relay is carried out through the aging numerical value corresponding to the current value when the change occurs each time, so that the accuracy of the aging prediction of the service life of the relay is improved; and whether the relay fails due to service life aging can be predicted in advance, and the probability that a high-voltage loop is formed in the power battery or the electric automobile loses power is reduced.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
In one embodiment, a relay aging prediction system for an automobile power battery is provided, which includes the automobile power battery and a control module for executing the relay aging prediction method for the automobile power battery in the above embodiment.
In one embodiment, an automobile is provided, which includes the relay aging prediction system of the automobile power battery in the above embodiment.
In one embodiment, a computer device is provided, which may be a server, the internal structure of which may be as shown in fig. 5. The computer device includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operating system and the computer program to run on the non-volatile storage medium. The database of the computer device is used for storing the relay aging prediction method of the automobile power battery in the embodiment. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method for predicting relay aging of an automotive power battery.
In one embodiment, a computer device is provided, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the relay aging prediction method for a vehicle power battery in the above embodiments is implemented.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, implements the relay aging prediction method of the automotive power battery in the above-described embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A relay aging prediction method for an automobile power battery is characterized by comprising the following steps:
after a preset stable time threshold value for starting a power battery is reached, acquiring a battery current signal of the power battery and a finished automobile load current signal of an automobile;
when the working state of a relay of the power battery is detected to be changed in real time, according to the load current signal of the whole vehicle and the current signal of the battery, an aging numerical value corresponding to the relay is inquired from a preset relay life table;
acquiring an aging numerical value accumulated value of the relay;
and carrying out aging prediction on the relay according to the aging numerical value accumulated value.
2. The method for predicting the relay aging of the automobile power battery as set forth in claim 1, wherein the obtaining the battery current signal of the power battery comprises:
acquiring an initial current signal of the power battery in real time, and preprocessing the initial current signal after determining that the initial current signal is effective to obtain the battery current signal.
3. The method for predicting the relay aging of the automobile power battery according to claim 1, wherein the obtaining of the battery current signal of the power battery and the entire automobile load current signal of the automobile comprises:
detecting whether a message transmission signal associated with the vehicle load current signal is interrupted;
when the message transmission signal related to the finished automobile load current signal is not interrupted, recording a load current signal contained in the current message transmission signal as the finished automobile load current signal;
when the message transmission signal related to the whole vehicle load current signal is interrupted, recording the load current signal contained in the last message transmission signal before interruption as the whole vehicle load current signal, or recording the whole vehicle load current signal as zero.
4. The method of claim 1, wherein the relay comprises a charge relay; the battery current signal comprises a charging current and a discharging current;
according to whole car load current signal and battery current signal, from predetermineeing relay life table inquiry with the ageing numerical value that the relay corresponds includes:
when the relay with the changed working state is determined to be a charging relay in the power battery, recording the sum of the charging current and the load current of the whole vehicle as a first current value, and recording the difference between the first current value and the discharging current as a second current value;
and inquiring a first aging numerical value associated with the second current value from the preset relay life table, and recording the first aging numerical value as the aging numerical value of the charging relay.
5. The method for predicting the aging of the relay of the automobile power battery as claimed in claim 4, wherein the method for searching the aging value corresponding to the relay from the preset relay life table according to the load current signal of the whole automobile and the battery current signal further comprises:
and when the relay with the changed working state is confirmed to be other relays except the charging relay in the power battery, acquiring a second aging numerical value associated with the discharging current from the preset relay life table, and recording the second aging numerical value as the aging numerical values of the other relays.
6. The method for predicting the aging of the relay of the automobile power battery according to any one of claims 1 to 5, wherein the predicting the aging of the relay according to the accumulated value of the aging value comprises the following steps:
acquiring a preset aging parameter design table; the preset aging parameter design table stores aging parameter design values related to the relay;
recording the ratio of the aging numerical value accumulated value to the aging parameter design value as an aging ratio;
and when the aging ratio is greater than or equal to a first aging threshold and smaller than a second aging threshold, sending a relay aging replacement alarm instruction to a preset receiver, wherein the first aging threshold is smaller than the second aging threshold.
7. The method for predicting relay aging of an automotive power battery as set forth in claim 6, wherein, after recording the ratio between the accumulated value of the aging numerical values and the design value of the aging parameter as an aging ratio, further comprising:
and when the aging ratio is smaller than the first aging threshold value, confirming that the relay does not need to be replaced currently.
8. The method for predicting relay aging of an automotive power battery as set forth in claim 6, wherein, after recording the ratio between the accumulated value of the aging numerical values and the design value of the aging parameter as an aging ratio, further comprising:
and when the aging ratio is greater than or equal to the second aging threshold, sending a relay severe aging instruction to the preset receiver, and switching off the relay to control the power battery to be switched off.
9. A relay aging prediction system for an automotive power battery, comprising an automotive power battery and a control module for executing the relay aging prediction method for the automotive power battery according to any one of claims 1 to 8.
10. An automobile, characterized by comprising the relay aging prediction system for an automobile power battery according to claim 9.
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