T-BOX built-in battery health diagnosis method and system and vehicle

Abstract

The invention discloses a T-BOX built-in battery health diagnosis method and system and a vehicle, and relates to the technical field of vehicle-mounted electronic equipment, and the method comprises the steps: measuring a no-load voltage value of a built-in battery, and measuring a load voltage value of the built-in battery when the built-in battery is loaded; calculating the internal resistance value of the built-in battery according to the no-load voltage value and the load voltage value, and finally comparing the internal resistance value with a preset threshold value to obtain the health state of the battery. The internal resistance value of the built-in battery is calculated by measuring the no-load voltage value of the built-in battery and the load voltage value of the built-in battery with the load, and then the health state of the battery is judged according to the internal resistance value, so that the technical problem of how to accurately judge the health state of the T-BOX built-in battery is solved.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle-mounted electronic equipment, and in particular to a T-BOX built-in battery health diagnosis method, system and vehicle. Background Art

[0002] With the development of vehicle electronic technology, T-BOX is widely used in vehicle systems as an electronic control unit of the vehicle. The normal operation of T-BOX is crucial to the safety and communication functions of the vehicle. In order to ensure the stable power supply of T-BOX, the health status of its built-in battery must be accurately judged.

[0003] At present, the health status of T-BOX's built-in battery is mainly determined by simple voltage detection or fixed charge and discharge cycle counts. However, it is difficult to accurately judge the health status of the battery based on voltage parameters alone, and transient changes in voltage may lead to misjudgment. These methods cannot accurately and real-time evaluate the health status of the battery.

[0004] On the other hand, the working environment of T-BOX is complex and changeable, which puts higher requirements on the power supply stability of its built-in battery. How to accurately judge the health status of T-BOX's built-in battery has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The main purpose of this application is to provide a T-BOX built-in battery health diagnosis method, system and vehicle, aiming to solve the technical problem of accurately judging the health status of the T-BOX built-in battery.

[0006] To achieve the above objectives, the present application proposes a T-BOX built-in battery health diagnosis method, the T-BOX built-in battery health diagnosis method comprising:

[0007] Measure the no-load voltage of the built-in battery;

[0008] Measuring a load voltage value of the built-in battery when it is loaded;

[0009] Calculating the internal resistance of the built-in battery according to the no-load voltage value and the load voltage value;

[0010] The internal resistance value is compared with a preset threshold value to obtain the battery health status.

[0011] In one embodiment, the step of measuring the no-load voltage value of the battery specifically includes:

[0012] Connecting a no-load load to both ends of the built-in battery, wherein the no-load load is used to control both ends of the built-in battery to be electrically equivalent to a disconnected state;

[0013] When both ends of the built-in battery are in a disconnected state, a no-load voltage value at both ends of the built-in battery is measured.

[0014] In one embodiment, the step of measuring the load voltage value of the built-in battery when it is loaded specifically includes:

[0015] When the no-load voltage value measurement is completed, disconnecting the no-load load from the built-in battery, and connecting a loaded load to both ends of the battery;

[0016] When the on-load load is connected to the built-in battery, the built-in battery is controlled to discharge, and the load voltage value is obtained during the discharge process of the built-in battery.

[0017] In one embodiment, the step of comparing the internal resistance value with a preset threshold value to obtain a battery health status specifically includes:

[0018] When the internal resistance value is less than the preset threshold value, it is determined that the built-in battery is in a healthy state at this time;

[0019] When the internal resistance value is greater than or equal to the preset threshold, it is determined that the built-in battery is in an unhealthy state.

[0020] In addition, to achieve the above-mentioned purpose, the present application also proposes a T-BOX built-in battery health diagnosis system, the system comprising: a control module, an on-off module, a load connection port, an unloaded load, and a loaded load;

[0021] The input end of the on-off module is connected to the built-in battery, the control end is connected to the output end of the control module, the output end is connected to the load connection port, the load connection port is also connected to the control module, and the input end of the control module is connected to the load connection port;

[0022] The control module is used to generate a detection signal and transmit the detection signal to the on-off module;

[0023] The on-off module is used to conduct the connection between the built-in battery and the load connection port when receiving the detection signal;

[0024] The control module is used to measure the no-load voltage value of the built-in battery when the load connection port is connected to the no-load load, and to measure the load voltage value of the built-in battery when the load connection port is connected to the loaded load;

[0025] The control module is also used to determine the internal resistance value of the built-in battery according to the no-load voltage value and the load voltage value, and compare the internal resistance value with a preset threshold value to obtain the battery health status.

[0026] In one embodiment, the on-off module includes: a first filtering subunit, a second filtering subunit, a protection subunit and a switch subunit;

[0027] One end of the first filter subunit is connected to the built-in battery, and the other end is connected to the ground;

[0028] One end of the protection subunit is connected to the built-in battery, and the other end is connected to the switch subunit;

[0029] One end of the switch subunit is connected to the built-in battery, one end is connected to the ground, and one end is connected to the output end of the control module;

[0030] One end of the second filter subunit is connected to one end of the switch subunit connected to the control module, one end is connected to the output end of the control module, and one end is grounded.

[0031] In one embodiment, the first filtering subunit includes: a first capacitor, the second filtering subunit includes: a second capacitor, a first resistor and a second resistor, the protection subunit includes: a third resistor and a fourth resistor, and the switch subunit includes a first MOS tube and a first transistor;

[0032] One end of the first capacitor is connected to the built-in battery, and the other end is connected to the ground;

[0033] One end of the first resistor is connected to the ground, and the other end is connected to the second capacitor and the second resistor at the same time, the other end of the second capacitor is connected to the ground, and the other end of the second resistor is connected to the output end of the control module;

[0034] The base of the first transistor is connected to the second resistor and one end of the first resistor is connected, the emitter of the first transistor is connected to the ground and the load module, the collector of the emitter is connected to the gate of the first MOS tube, the source of the first MOS tube is connected to the load module, and the drain of the first MOS tube is connected to the built-in battery;

[0035] One end of the third resistor is connected to the emitter of the first transistor, and the other end is connected to the gate of the first MOS tube. One end of the fourth resistor is connected to the built-in battery, and the other end is connected to the gate of the first MOS tube.

[0036] In one embodiment, the no-load load includes: a fifth resistor, a sixth resistor, and a seventh resistor;

[0037] One end of the fifth resistor is connected to the source of the first MOS tube, and the other end is connected to one end of the sixth resistor. The end of the sixth resistor connected to the fifth resistor is also connected to the other end of the seventh resistor. The other end of the sixth resistor is connected to the emitter of the first transistor, and the other end of the seventh resistor is connected to the input end of the control module.

[0038] In one embodiment, the load includes: an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a third capacitor and a seventh resistor;

[0039] The two ends of the eighth resistor are respectively connected to the two ends of the ninth resistor, the two ends of the tenth resistor are respectively connected to the two ends of the eleventh resistor, one end of the eighth resistor is also connected to the source of the first MOS tube, the other end of the eighth resistor is also connected to one end of the tenth resistor and one end of the seventh resistor, the other end of the tenth resistor is connected to the emitter of the first transistor, the other end of the seventh resistor is connected to the input end of the control module, one end of the third capacitor is connected to one end connected to the tenth resistor and the emitter of the first transistor, and the other end of the third capacitor is connected to the input end of the control module.

[0040] In addition, to achieve the above objectives, the present application also provides a vehicle, which includes the above-mentioned T-BOX built-in battery health diagnostic system.

[0041] One or more technical solutions proposed in this application have at least the following technical effects:

[0042] The present application measures the no-load voltage value of the built-in battery and the load voltage value of the built-in battery when it is loaded, then calculates the internal resistance value of the built-in battery based on the no-load voltage value and the load voltage value, and finally compares the internal resistance value with a preset threshold value to obtain the battery health status.

[0043] Since the technical solution of measuring the no-load voltage value and the load voltage value of the built-in battery when loaded, calculating the internal resistance value of the built-in battery, and comparing it with the preset threshold value to judge the battery health status is adopted, the health status of the battery can be evaluated more comprehensively and accurately, which effectively solves the limitation of judging the battery health status based on the battery voltage parameter alone in the prior art, and thus realizes the accurate diagnosis of the health status of the T-BOX built-in battery. Measuring the voltage parameters of the built-in battery in two working states of no-load and load can reflect the power supply capacity of the battery from two dimensions. Judging the battery health status according to the internal resistance value can eliminate the risk of misjudgment caused by transient voltage changes, making the judgment more accurate and reliable. Compared with the method of judging the battery health status based on the voltage parameter alone in the prior art, this technical solution provides a more comprehensive and accurate health status assessment, which can effectively reduce the false alarm rate, realize accurate diagnosis of the battery, provide a basis for scientific decision-making in subsequent battery management, and improve the reliability and safety of T-BOX. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0045] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0046] Figure 1 A flowchart of a T-BOX built-in battery health diagnosis method embodiment 1 provided in this application;

[0047] Figure 2 A flowchart of a T-BOX built-in battery health diagnosis method embodiment 2 provided in this application;

[0048] Figure 3 A schematic diagram of functional modules provided in Example 3 of a T-BOX built-in battery health diagnosis system of the present application;

[0049] Figure 4 A circuit structure diagram provided for a fourth embodiment of a T-BOX built-in battery health diagnosis system of the present application;

[0050] Figure 5 Another circuit structure diagram provided for Example 4 of a T-BOX built-in battery health diagnosis system of the present application.

[0051] Description of Figure Numbers:

[0052]

[0053]

[0054] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0055] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0056] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0057] It should be noted that the execution subject of this embodiment may be a computing service device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic device capable of realizing the above functions, etc. The following takes the T-BOX built-in battery health diagnosis system as an example to illustrate this embodiment and the following embodiments.

[0058] Based on this, the present application embodiment provides a harmonic T-BOX built-in battery health diagnosis method, referring to Figure 1 , Figure 1 This is a flow chart of a first embodiment of a method for determining a harmonic current injection control index of the present application.

[0059] In this embodiment, the method for determining the harmonic current injection control index includes steps S10 to S40:

[0060] Step S10, measuring the no-load voltage value of the built-in battery.

[0061] Among them, measurement refers to obtaining the voltage parameters of the battery using a voltmeter or data acquisition device; the built-in battery refers to the battery embedded inside the T-BOX host and powers the T-BOX; the no-load voltage value refers to the value of the open circuit voltage measured when the battery power supply circuit is equivalent to an open circuit.

[0062] Specifically, this step is one of the preparatory steps before performing a health diagnosis on the built-in battery. Its purpose is to obtain the open circuit voltage value of the built-in battery under no-load conditions to prepare the parameters for the subsequent calculation of the internal resistance. Before performing the diagnosis and calculation, the built-in battery needs to be in a no-load state. Then the T-BOX built-in battery health diagnosis system reads the voltage value at both ends of the battery through the voltage test module. The voltage value obtained is the no-load voltage value. The no-load voltage value can reflect the battery power status.

[0063] In some embodiments, this can be achieved in a variety of ways:

[0064] Optionally, a voltage test module is provided, whose input terminal is connected to the positive and negative electrodes of the built-in battery, and the voltage value collected by the voltage test module is read as the no-load voltage value by controlling both ends of the battery to be in an open circuit state;

[0065] Optionally, design a voltage measurement circuit, including an op amp voltage follower and a voltage divider resistor network. While ensuring that both ends are open, connect the input end of the circuit to the positive and negative poles of the built-in battery, obtain the voltage value of the built-in battery through the voltage follower, and convert the voltage value to the ADC measurement range of the MCU through the voltage divider circuit. Then, the MCU collects the divided voltage value through the ADC to obtain the no-load voltage value.

[0066] It is understandable that other methods may be used to implement no-load voltage measurement, which is not limited here.

[0067] Step S20, measuring the load voltage value of the built-in battery when it is loaded;

[0068] Among them, measurement refers to using a voltmeter or data acquisition device to obtain the voltage parameters of the battery; the built-in battery refers to the battery embedded inside the T-BOX host to power the T-BOX; the load voltage value refers to the value of the working voltage measured when a load is connected to both ends of the battery for discharge.

[0069] Specifically, this step is performed after measuring the no-load voltage value. Its purpose is to obtain the output voltage value of the built-in battery when it is working under load, and also to prepare the parameters for the subsequent calculation of the internal resistance. After the no-load voltage measurement is completed, it is necessary to connect a rated resistance load to both ends of the battery to put it into working state, and read the voltage value at the same time. The voltage obtained is the load voltage value. This value can reflect the power supply capacity of the battery.

[0070] In some embodiments, this can be achieved in a variety of ways:

[0071] Optionally, a rated resistance load is connected to both ends of the built-in battery through an electronic switch, and its voltage value is measured and recorded as the load voltage value;

[0072] Optionally, an adjustable electronic load module is connected to both ends of the built-in battery, a fixed resistance is set, the battery enters a discharge state, and its voltage value is measured and recorded as the load voltage value.

[0073] It is understandable that other methods may be used to obtain the load voltage, which is not limited here.

[0074] Step S30, calculating the internal resistance of the built-in battery according to the no-load voltage value and the load voltage value;

[0075] The internal resistance of the built-in battery refers to the equivalent series resistance value caused by comprehensive factors such as the battery cells, leads, and connectors inside the built-in battery.

[0076] Specifically, this step is a calculation step performed after obtaining the two key voltage parameters of the no-load open-circuit voltage value and the load operating voltage value of the built-in battery. Its purpose is to use the circuit voltage division principle formula to calculate the equivalent internal resistance value of the built-in battery based on these two voltage values. The internal resistance value is a key parameter for diagnosing the health status of the built-in battery. The calculation formula is: internal resistance value = (no-load voltage value - load voltage value) / load current, where the load current can be calculated from the rated load resistance value. The calculated internal resistance value can reflect the health status of the built-in battery and the severity of degradation.

[0077] In some embodiments, the calculation can be achieved in a variety of ways:

[0078] Optionally, use an MCU and a programming algorithm to automatically read the measured voltage value, substitute it into the formula to perform the operation and output the calculated internal resistance value result; it is understood that the internal resistance value can also be obtained by other calculation methods, which are not limited here.

[0079] Step S40, comparing the internal resistance value with a preset threshold value to obtain a battery health status;

[0080] Among them, the internal resistance value refers to the digital equivalent internal resistance value of the built-in battery calculated in the previous steps; the preset threshold value is the upper threshold value of the internal resistance value obtained based on the performance parameter analysis of the built-in battery of this model, which can be saved in advance as a basis for judgment; the battery health status refers to the judgment result of the good or bad status of the built-in battery after comparing with the threshold value.

[0081] Specifically, this step is performed after calculating the internal resistance value of the built-in battery. Its purpose is to compare the internal resistance value with the preset internal resistance threshold upper limit, and judge the health status of the built-in battery according to the comparison result. The judgment rule is that if the calculated internal resistance value is greater than or equal to the preset internal resistance threshold, the built-in battery is judged to be in an unhealthy state; conversely, if the internal resistance value is less than the internal resistance threshold, the built-in battery is judged to be in a healthy state. In addition, the closer the internal resistance value is to the preset threshold, the worse the health status of the built-in battery is.

[0082] In some embodiments, the comparison and judgment can be implemented in a variety of ways:

[0083] Optionally, the system compares the calculated internal resistance value with a set threshold value through MCU programming, and directly outputs the comparison result as a health status according to the rules;

[0084] Optionally, the system collects the internal resistance value and the preset threshold value, and outputs the internal resistance value and the preset threshold value at the same time, so that the user can judge the health status of the built-in battery.

[0085] It is understood that other judgment methods may also be used and are not limited here.

[0086] In summary, this embodiment measures the no-load voltage value of the built-in battery and the load voltage value of the built-in battery when it is loaded, then calculates the internal resistance value of the built-in battery based on the no-load voltage value and the load voltage value, and finally compares the internal resistance value with a preset threshold to obtain the battery health status.

[0087] Since the technical solution of measuring the no-load voltage value and the load voltage value of the built-in battery when loaded, calculating the internal resistance value of the built-in battery, and comparing it with the preset threshold value to judge the battery health status is adopted, the health status of the battery can be evaluated more comprehensively and accurately, which effectively solves the limitation of judging the battery health status based on the battery voltage parameter alone in the prior art, and thus realizes the accurate diagnosis of the health status of the T-BOX built-in battery. Measuring the voltage parameters of the built-in battery in two working states of no-load and load can reflect the power supply capacity of the battery from two dimensions. Judging the battery health status according to the internal resistance value can eliminate the risk of misjudgment caused by transient voltage changes, making the judgment more accurate and reliable. Compared with the method of judging the battery health status based on the voltage parameter alone in the prior art, this technical solution provides a more comprehensive and accurate health status assessment, which can effectively reduce the false alarm rate, realize accurate diagnosis of the battery, provide a basis for scientific decision-making in subsequent battery management, and improve the reliability and safety of T-BOX.

[0088] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can be referred to the above introduction and will not be repeated later.

[0089] refer to Figure 2 , based on the first embodiment, this embodiment provides a more detailed implementation.

[0090] Step S101, connecting an unloaded load to both ends of the built-in battery;

[0091] The no-load load refers to a load module or device used in a circuit to simulate making the two ends of a built-in battery electrically equivalent to a disconnected state.

[0092] Specifically, this step is a preparatory step before conducting the no-load open circuit voltage test of the built-in battery. The purpose is to connect a no-load load to the positive and negative terminals of the built-in battery so that the two terminals are electrically disconnected. The no-load load can be implemented by using a load circuit with a very large resistance value, so that the equivalent load current value at both ends of the built-in battery is very small and can be ignored, which is close to an open circuit state. After connecting the no-load load, the two terminals of the built-in battery are electrically equivalent to being completely disconnected. This is the parameter preparation for measuring the no-load open circuit voltage.

[0093] In some embodiments, accessing an idle load can be achieved in two ways:

[0094] Optionally, use a resistor voltage divider network circuit module with a large resistance value as a no-load load and install it between the positive and negative electrodes of the built-in battery, so that its two ends are electrically equivalent to an open circuit;

[0095] Optionally, a MOS tube switch circuit is used to put the MOS tube in a cut-off state to achieve an equivalent open circuit effect at both ends of the built-in battery.

[0096] Of course, other types of circuits may also be used to form the no-load load, and the specific implementation form of the no-load load circuit is not limited here.

[0097] Step S102, measuring a no-load voltage value at both ends of the built-in battery when both ends of the built-in battery are in a disconnected state;

[0098] The no-load voltage value refers to the open circuit voltage value across the built-in battery measured when the positive and negative electrodes of the built-in battery are completely disconnected, that is, when no load is connected to the two ends.

[0099] Specifically, this step is performed immediately after connecting a no-load load in the previous step to make the two ends of the built-in battery equivalent to an open circuit. The purpose is to measure the open circuit voltage value of the built-in battery when the two ends are completely disconnected. The collected open circuit voltage value is defined as the no-load voltage value. During measurement, the open circuit voltage of the built-in battery can be measured by a voltage test instrument when the positive and negative ends of the built-in battery are completely disconnected, and the measured voltage value is recorded as the no-load voltage value of the built-in battery. The measured no-load voltage value can be used to reflect the current state of sufficient power of the built-in battery pack.

[0100] In some embodiments, measuring the no-load voltage value can be achieved in two ways:

[0101] Optionally, a voltage test module is provided, whose input terminal is connected to the positive and negative electrodes of the built-in battery, and the voltage value collected by the voltage test module is read as the no-load voltage value by controlling both ends of the battery to be in an open circuit state;

[0102] Optionally, a data acquisition card is used to collect an open circuit voltage waveform at both ends of the built-in battery in an open circuit state, and its effective value RMS is calculated as the open circuit voltage value.

[0103] Of course, other types of measuring devices and methods may also be used to obtain the no-load voltage value, and the form of the measuring device is not limited here.

[0104] Step S201, when the no-load voltage value measurement is completed, disconnecting the no-load load from the built-in battery, and connecting a loaded load to both ends of the battery;

[0105] The on-load load refers to a load circuit used to make the built-in battery work under rated load conditions.

[0106] Specifically, this step is performed after the no-load open-circuit voltage value of the built-in battery is measured and recorded using an ammeter test device. The purpose is to prepare to measure the working voltage parameters of the built-in battery under load conditions. The T-BOX built-in battery health diagnosis system needs to disconnect the no-load load circuit connected to both ends of the built-in battery, and then connect a load circuit with a rated resistance value to both ends, so that the built-in battery can enter the rated load working state from the no-load state. In this way, the working mode of the built-in battery can be changed to prepare for the subsequent measurement of its output voltage value under load conditions.

[0107] In some embodiments, different load circuits can be switched in two ways:

[0108] Optionally, a relay control circuit is used to switch the no-load load and the loaded load across the built-in battery;

[0109] Optionally, an analog switch chip is used to automatically switch between a no-load load circuit and a loaded load circuit connected to both ends of the built-in battery.

[0110] Of course, other types of switching methods may also be used to accurately connect the load circuit, and the specific form of the switching circuit is not limited here.

[0111] Step S202, when the on-load load is connected to the built-in battery, controlling the built-in battery to discharge, and obtaining the load voltage value during the discharge process of the built-in battery;

[0112] The load voltage value refers to the output working voltage value at both ends of the built-in battery when it performs normal discharge operation under the action of the load circuit.

[0113] Specifically, this step is performed immediately after the loaded circuit is correctly connected to the two ends of the built-in battery. The purpose is that the T-BOX built-in battery health diagnosis system controls the built-in battery to discharge at the rated current under the action of the load, and at the same time measures and records the instantaneous working voltage value at both ends of the built-in battery through the voltage test equipment. A complete discharge working cycle can be set in advance, and the working voltage value is collected during this cycle time, and the average value or effective value is calculated as the final load voltage value of the built-in battery. The load voltage value can directly reflect the output performance and power supply capacity of the built-in battery.

[0114] In some embodiments, measuring the load working voltage of the built-in battery can be achieved in two ways:

[0115] Optionally, a storage-type digital oscilloscope is used to detect and store the instantaneous voltage waveform across the built-in battery during the discharge process;

[0116] Optionally, a high-speed data acquisition card is used to acquire the instantaneous voltage value during the discharge process.

[0117] Of course, other types of measuring devices may also be used to obtain the load voltage value, and the specific implementation form of the measuring device is not limited here.

[0118] Step S301, calculating the internal resistance of the built-in battery according to the no-load voltage value and the load voltage value;

[0119] This step refers to step 30 of the first embodiment and will not be described in detail here.

[0120] Step S401, when the internal resistance value is less than the preset threshold, it is determined that the built-in battery is in a healthy state at this time;

[0121] Among them, the preset threshold is an upper threshold value of the internal resistance value obtained by comprehensive analysis of factors such as the specification parameters and service life requirements of the built-in battery of this model. It can be pre-set and saved according to actual conditions as a basis for judging the health status of the battery; judging that the built-in battery is in a healthy state means comparing it with the preset threshold. If the internal resistance value is lower than the upper threshold value, it can be determined that the built-in battery is currently in normal working condition.

[0122] Specifically, this step is a judgment operation performed after calculating the internal resistance value of the built-in battery. Its purpose is to compare the calculated internal resistance value with the preset threshold upper limit saved in advance to determine the size. If the internal resistance value is lower than the preset threshold, it can be judged that the built-in battery is still in normal working condition and can continue to be used without maintenance or replacement. In addition, the closer the internal resistance value is to the preset threshold, the worse the health status of the built-in battery. The judgment rule is that if the calculated internal resistance value is smaller than the preset threshold upper limit, it means that the increase in the internal resistance of the built-in battery is still within the controllable range, and the battery's power supply capacity can still meet the use requirements and has not reached the state of needing maintenance or replacement. Therefore, it can be judged that the built-in battery is still in a healthy state and can continue to be used normally.

[0123] In some embodiments, the comparison between the internal resistance value and the threshold value can be achieved in two ways:

[0124] Optionally, an MCU is used to automatically compare the internal resistance value with a set threshold value through programming, and the comparison result is output according to the judgment rule;

[0125] Optionally, the system collects the internal resistance value and the preset threshold value, and outputs the internal resistance value and the preset threshold value at the same time, so that the user can judge the health status of the built-in battery.

[0126] Of course, other reasonable hardware circuits or software codes may also be used to implement the determination and comparison of the internal resistance value and the threshold value, and the specific implementation form is not limited here.

[0127] Step S402, when the internal resistance value is greater than or equal to the preset threshold, it is determined that the built-in battery is in an unhealthy state at this time;

[0128] Among them, the internal resistance value still refers to the numerical equivalent internal resistance of the built-in battery obtained in the previous calculation step; the preset threshold is also the upper limit of the internal resistance value set in advance according to the battery specification parameters and service life requirements; judging that the built-in battery is in an unhealthy state means comparing with the threshold value. If the internal resistance value is greater than or equal to the threshold value, it can be determined that the built-in battery has begun to decay and has decayed to a level that affects normal use.

[0129] Specifically, this step is also a judgment operation performed after calculating the internal resistance value of the built-in battery. Its purpose is to compare the internal resistance value with the pre-saved preset threshold upper limit. If the calculated internal resistance value is greater than or equal to the set threshold, it can be judged that the health status of the built-in battery has declined to the extent that it affects normal use, which may affect subsequent normal use and requires maintenance or replacement. The judgment rule is that if the calculated internal resistance value is greater than or equal to the preset threshold, it means that the increase in the internal resistance of the built-in battery is already in an uncontrollable range, the battery's power supply capacity has decreased, and it may not be able to meet normal use requirements. It is close to a state that requires maintenance or replacement, so at this time it can be determined that the built-in battery is in an unhealthy state and corresponding maintenance measures need to be taken.

[0130] In some embodiments, the internal resistance value and the threshold value can also be determined in two ways:

[0131] Optionally, the MCU can be programmed to automatically compare the calculated internal resistance value with a set threshold value and output the judgment result according to the rules;

[0132] Optionally, the calculated internal resistance values ​​and the set threshold values ​​are manually collected for visual comparison, and a final determination conclusion is written according to a predetermined rule.

[0133] Of course, other methods may also be used to implement the determination and comparison of the internal resistance value and the threshold value, and the specific implementation form is not limited here.

[0134] In summary, in this embodiment, since different load circuits are switched after the no-load voltage value measurement is completed, the no-load load is disconnected first, and then the loaded load is connected. The technical solution, the no-load open circuit voltage value and the load working voltage value can be accurately obtained by controlling the working state of the battery in a targeted manner, which effectively solves the problem that the working state of the battery in the prior art is uncontrollable, resulting in the difficulty in obtaining the no-load and load voltages, thereby realizing the effective knowledge of the voltage characteristics of the built-in battery under different working states. Specifically, the innovation in this technical solution is that it is proposed to change the working state of the built-in battery by switching different load circuits to obtain the voltage parameters under different states. Its beneficial effect is that compared with the prior art that cannot control the working state of the battery in a targeted manner, this technical means can effectively obtain the voltage values ​​under two states by switching the no-load load and the loaded load, providing reliable parameters for calculating the internal resistance and judging the health state, thereby improving the accuracy and controllability of the test. At the same time, changing the working state by switching the load circuit avoids the voltage parameter fluctuation caused by the spontaneous change of the battery state, ensuring that the acquisition of the no-load voltage value and the load voltage value is carried out under the same reference conditions, and enhancing the comparability of the test results. In short, this technical solution realizes effective control of the working status of the built-in battery, thereby improving the accuracy of voltage parameter acquisition and internal resistance calculation, providing a more reliable basis for the final battery health judgment and achieving the purpose of more accurate diagnosis of the battery health status.

[0135] Based on the first embodiment and / or the second embodiment of the present application, in the third embodiment of the present application, the same or similar contents as those of the above-mentioned embodiments one and two can be referred to the above introduction and will not be repeated later. Figure 3 This application provides a functional module diagram of a T-BOX built-in battery health diagnosis system.

[0136] The T-BOX built-in battery health diagnosis device includes: a control module 10, a switch module 20, a load connection port 30, an unloaded load 40, and a loaded load 50;

[0137] The input end of the on-off module 20 is connected to the built-in battery, the control end is connected to the output end of the control module 10, the output end is connected to the load connection port 30, the load connection port 30 is also connected to the control module 10, and the input end of the control module 10 is connected to the load connection port 30;

[0138] Among them, the control module 10 refers to a core processing device with control, processing and calculation functions, which is used for the control and scheduling of the entire battery health diagnosis system.

[0139] Specifically, the control module 10 plays a control and calculation role in the battery health diagnosis system. It can generate various control and detection signals, connect with other modules through lines, and coordinate various operation processes of the system. During diagnosis, it can control the on-off module 20 to conduct the connection between the built-in battery and the load module, and can also collect voltage measurement values ​​when the no-load load 40 and the loaded load 50 are connected, calculate the internal resistance based on the voltage value, and compare it with the threshold to determine the battery health status. In short, the control module 10 realizes the overall control of the entire diagnostic system.

[0140] In some embodiments, the control module 10 can be implemented in two ways:

[0141] Optionally, a single chip microcomputer or a microcontroller is used as the control module 10, and a firmware program is written to implement the diagnostic control logic;

[0142] Optionally, the control module 10 is constructed using a field programmable gate array or an application specific integrated circuit.

[0143] It is understandable that the control module 10 may also be implemented in other ways, which are not limited here.

[0144] The on-off module 20 refers to a switch device having the function of connecting and disconnecting the built-in battery and the load, and is used to control the connection state of the built-in battery power supply circuit.

[0145] Specifically, the on-off module 20 plays the role of a built-in battery power supply controller in the diagnostic system. It can accurately control the conduction or disconnection of the power supply circuit between the built-in battery and the load module according to the instructions of the control module 10. At the beginning of the diagnostic process, the on-off module 20 first connects the built-in battery and the load module to establish a power supply connection. After the no-load voltage measurement is completed, it disconnects the no-load load 40, and then turns on the loaded load 50 to achieve precise switching between no-load and load states, thereby ensuring accurate collection of voltage parameters under different load conditions. In short, the on-off module 20 realizes precise power supply control between the built-in battery and the load.

[0146] In some embodiments, the on-off module 20 can be implemented in two ways:

[0147] Optionally, a relay or a mechanical contact switch is used to construct the on-off module 20, and the on-off is realized by driving the contact action by an electromagnet;

[0148] Optionally, a solid-state switch circuit such as a MOS tube or an IGBT is used to form the on-off module 20, and precise control is achieved by controlling the switch through an electrical signal.

[0149] Of course, other suitable switch circuits can also be used, and the specific circuit structure is not limited here. The load connection port 30 refers to a physical port or interface in the system for connecting a load.

[0150] Specifically, the load connection port 30 serves as a bridge between the output terminal of the built-in battery and the input terminal of the load in the system, and is used to connect the load device to the built-in battery. During the diagnosis process, it is connected to the no-load load 40 and the loaded load 50 in turn, and the two different types of loads are connected to the two ends of the built-in battery so that the system can obtain the corresponding voltage parameters.

[0151] In summary, the load connection port 30 realizes the physical connection between the built-in battery and the load device.

[0152] In some embodiments, the load connection port 30 can be implemented in two ways:

[0153] Optionally, a cable connection terminal or a connector is used as the load connection port 30;

[0154] Optionally, use a pin header or pin header on a PCB as a connection port.

[0155] It is understandable that other methods may be used to achieve port connection, which is not limited here.

[0156] The no-load load 40 refers to a load circuit used to simulate that both ends of the built-in battery are electrically equivalent to a disconnected state. The specific circuit structure is not limited here.

[0157] Specifically, the no-load load 40 is first connected to both ends of the built-in battery during the diagnosis process to simulate the no-load state of the built-in battery. The no-load load 40 can be implemented by a resistor network with a very large resistance value, so that the equivalent load current at both ends of the built-in battery can be almost ignored, which is approximately an open circuit state to achieve an electrically disconnected effect. In this way, the no-load open circuit voltage of the built-in battery can be accurately measured to obtain the voltage parameters under the no-load state. In short, the no-load load 40 is used to simulate the no-load equivalent state of the battery.

[0158] In some embodiments, no-load load 40 can be achieved in two ways:

[0159] Optionally, use a voltage divider resistor network with very large resistance values;

[0160] Optionally, use a high value heat sink resistor.

[0161] It is understandable that the no-load load 40 may be formed in other ways, which are not limited here.

[0162] The load 50 is a load circuit that can operate the built-in battery at a rated current.

[0163] Specifically, the load 50 is connected to both ends of the built-in battery during the diagnosis process to simulate the rated load working state of the built-in battery. The load 50 can be composed of several fixed resistors of appropriate resistance connected in series. When the built-in battery is powered, these resistors can produce a load effect approximately equal to the rated current, so that the built-in battery works in the rated load state. In this way, the load working voltage of the built-in battery can be measured and the voltage parameters under the load state can be obtained. In short, the load 50 is used to simulate the rated load state of the battery.

[0164] In some embodiments, carrying load 50 can be achieved in two ways:

[0165] Optionally, a fixed-resistance resistor is used to construct the load 50 so that the built-in battery provides a rated current;

[0166] Optionally, a dedicated electronic load device is used to construct the on-load load 50 and set a rated current value.

[0167] Of course, other methods may also be used to construct the circuit with load 50, and the specific circuit structure is not limited here.

[0168] When the T-BOX built-in battery health diagnosis system of the third embodiment of the present application performs diagnosis, the control module 10 first generates a detection signal and sends it to the on-off module 20. After receiving the signal, the on-off module 20 turns on the connection between the built-in battery and the load connection port 30 to establish a power supply circuit for the built-in battery. Then the control module 10 controls the load port to successively connect the no-load load 40 and the loaded load 50. When the no-load load 40 is connected, the no-load open circuit voltage of the built-in battery is measured, and when the loaded load 50 is connected, the load working voltage of the built-in battery is measured. Finally, the control module 10 calculates the internal resistance value of the built-in battery based on the measured no-load and load voltages, and compares it with the preset internal resistance threshold value, thereby judging the health status of the built-in battery.

[0169] In the embodiment of the present application, due to the use of the system architecture of the control module 10, the on-off module 20, the load connection port 30 and the switchable no-load load 40 and the loaded load 50, the working state of the built-in battery can be accurately controlled, and the voltage values ​​under the no-load and load states can be accurately obtained, which effectively solves the problem of inaccurate voltage parameter acquisition caused by the inability to distinguish different working states of the battery in the prior art, thereby improving the accuracy of internal resistance calculation and health judgment. Specifically, the innovation of the technical solution lies in the proposal of a system framework dedicated to the health diagnosis of the built-in battery. The framework can control the working state of the built-in battery in a targeted manner and obtain characteristic voltage parameters under different states through the overall scheduling of the control module 10, the precise switching of the on-off module 20, and the access of different load modes. Its beneficial effect is: compared with the prior art that cannot distinguish the working state of the battery, the diagnostic system can accurately obtain the no-load and load voltage values ​​through state switching and control, overcomes the problem of uncontrollable voltage acquisition, and thus the calculated internal resistance value is more accurate and reliable, and the final health state judgment is also more accurate. At the same time, the system framework provides a modular and flexibly configurable diagnostic platform, which can be applied to different types of built-in batteries by adjusting the parameters of the load circuit, and has strong expansibility. In short, this technical solution achieves effective control of the working status of the built-in battery through the application of a dedicated system architecture, improves the accuracy of key parameter acquisition and diagnosis, and achieves the purpose of more accurate judgment of the battery health status.

[0170] Based on the first embodiment, the second embodiment and / or the third embodiment of the present application, in the fourth embodiment of the present application, the same or similar contents as those of the above-mentioned first embodiment, the second embodiment and the third embodiment can be referred to the above introduction and will not be repeated later.

[0171] Figure 4 This application provides a circuit diagram of a T-BOX built-in battery health diagnosis system when connected to an unloaded load 40.

[0172] As shown in the figure, the on-off module 20 includes: a first filtering subunit 201, a second filtering subunit 202, a protection subunit 203 and a switch subunit 204;

[0173] One end of the first filter subunit 201 is connected to the built-in battery, and the other end is connected to the ground;

[0174] One end of the protection subunit 203 is connected to the built-in battery, and the other end is connected to the switch subunit 204;

[0175] The switch subunit 204 has one end connected to the built-in battery, one end connected to the ground, and one end connected to the output end of the control module 10;

[0176] One end of the second filter subunit 202 is connected to one end of the switch subunit 204 connected to the control module 10 , one end is connected to the output end of the control module 10 , and one end is grounded.

[0177] The first filtering subunit 201 refers to a filtering circuit disposed at the positive terminal of the built-in battery, and is used to filter and suppress various pulse interferences and noises from the battery.

[0178] Specifically, the first filtering subunit 201 is connected to the positive terminal of the built-in battery. As the first-stage filtering circuit on the battery side, it can filter and suppress various pulse interferences and high-frequency noises generated by the built-in battery during operation. The function of the first filtering subunit 201 is to suppress these millisecond or microsecond pulses and high-frequency interferences within an acceptable range through its frequency domain characteristics, ensure the quality of the current and voltage signals supplied by the built-in battery, and provide cleaner and more stable power supply conditions for the normal operation of the built-in battery. During the operation of the entire diagnostic system, the first filtering subunit 201 plays the role of input-end filtering, which can effectively suppress the influence of various millisecond and microsecond fast transient interferences from the battery side on the stable operation of the system, and ensure the reliable operation of the system.

[0179] In some embodiments, the first filtering subunit 201 can be implemented in two ways:

[0180] Optionally, a passive LC low-pass filter circuit consisting of an inductor and a capacitor is used to implement the first stage of filtering;

[0181] Optionally, an active RC filter circuit with an operational amplifier is used to form the first stage of filtering.

[0182] Of course, a filtering topology may also be used to implement the filtering function of the first filtering subunit 201. The specific circuit structure is not limited here.

[0183] The second filtering subunit 202 refers to a filtering circuit disposed between the switch subunit 204 and the control module 10 , and is used to filter the signal output by the control module 10 .

[0184] Specifically, the input end of the second filter subunit 202 is connected to one side of the switch subunit 204, and the output end is connected to one side of the control module 10. It filters the control signal output by the control module 10 to drive the switch subunit 204. The function of the second filter subunit 202 is to filter the millisecond or microsecond pulse interference in the control signal to ensure the quality of the control signal provided to the switch subunit 204, thereby ensuring the precise control of the switch subunit 204 and avoiding malfunction. During the operation of the entire system, the second filter subunit 202 plays the role of filtering the control output signal, which can effectively suppress the interference of noise in the control line on the control of the switch subunit 204.

[0185] In some embodiments, the second filtering subunit 202 can be implemented in two ways:

[0186] Optionally, use a passive LC low-pass filter circuit with inductors and capacitors;

[0187] Optionally, an active RC filter circuit using an operational amplifier is used.

[0188] Of course, other filter topologies can also be used to implement the second filter function. The specific circuit structure is not limited here.

[0189] The protection subunit 203 refers to a protection circuit provided between the built-in battery and the switch subunit 204, and is used to implement protection functions such as overcurrent and overvoltage.

[0190] Specifically, the protection subunit 203 is connected between the built-in battery and the switch subunit 204. It can monitor the circuit in real time and quickly disconnect the circuit when the current or voltage exceeds the safety threshold to prevent the built-in battery and other electronic devices from being damaged. The protection subunit 203 usually integrates multiple protection functions such as overcurrent protection and overvoltage protection. It acts as a protector when the circuit is working normally. Once an abnormality occurs, protective measures are taken quickly to ensure the safety and reliability of the circuit. During the operation of the entire system, the protection subunit 203 can promptly prevent potential power supply abnormalities from causing damage to the system.

[0191] In some embodiments, the protection subunit 203 can be implemented in two ways:

[0192] Optionally, use fuses, circuit breakers or current-limiting resistors to implement overcurrent protection;

[0193] Optionally, overvoltage protection can be achieved by using a voltage-controlled switch, a TVS diode, etc.

[0194] Of course, multiple protection components may also be integrated to realize the comprehensive protection function of the protection subunit 203. The specific circuit structure is not limited here.

[0195] The switch subunit 204 is a switch circuit device that realizes precise conduction and disconnection between the built-in battery and the load module.

[0196] Specifically, the switch subunit 204, as the core switching component in the diagnostic system, receives the digital or analog control signal of on or off from the control module 10, and performs on or off operation according to the control signal in a precise time sequence and action specification, thereby controlling the connection and shielding of the power supply circuit of the built-in battery to the load module in real time, realizing the smooth switching of the system between the no-load state and the load state, and promoting the normal working process of the diagnostic system. The precise switching operation of the switch subunit 204 is crucial to ensure the controllability and accuracy of the voltage parameter acquisition of the system in different working modes.

[0197] In some embodiments, the switch subunit 204 can be implemented in two ways:

[0198] Optionally, a metal oxide semiconductor field effect transistor (MOSFET) is used to construct a switch circuit, and the gate control characteristics of the MOS tube are used to achieve precise on-off control, which has the advantages of rapid action and long life;

[0199] Optionally, a mechanical relay is used to construct a switching circuit, and the isolation and disconnection characteristics of the relay are utilized. This can be suitable for precise switching of high-power loads, and has the advantages of strong anti-interference ability, etc.

[0200] Of course, other types of switch devices or circuits may also be used to implement the function of the switch subunit 204. In short, accurate control of the switch subunit 204 is crucial to the reliable operation of the system.

[0201] For further reference, Figure 4 For the on-off module 20, this application provides a more specific circuit implementation for reference.

[0202] The first filtering subunit 201 includes: a first capacitor C1, the second filtering subunit 202 includes: a second capacitor C2, a first resistor R1 and a second resistor R2, the protection subunit 203 includes: a third resistor R3 and a fourth resistor R4, and the switch subunit 204 includes a first MOS tube Q2 and a first transistor Q1;

[0203] One end of the first capacitor C1 is connected to the built-in battery, and the other end is connected to the ground;

[0204] One end of the first resistor R1 is connected to the ground, and the other end is connected to the second capacitor C2 and the second resistor R2 at the same time. The other end of the second capacitor C2 is connected to the ground, and the other end of the second resistor R2 is connected to the output end of the control module 10;

[0205] The base of the first transistor Q1 is connected to the second resistor R2 and one end of the first resistor R1, the emitter of the first transistor Q1 is connected to the ground and the load module, the collector of the emitter is connected to the gate of the first MOS tube Q2, the source of the first MOS tube Q2 is connected to the load module, and the drain of the first MOS tube Q2 is connected to the built-in battery;

[0206] One end of the third resistor R3 is connected to the emitter of the first transistor Q1, and the other end is connected to the gate of the first MOS tube Q2. One end of the fourth resistor R4 is connected to the built-in battery, and the other end is connected to the gate of the first MOS tube Q2.

[0207] For no-load load 40, this application also provides a specific circuit implementation method, refer to Figure 4 , as shown in the figure, the no-load load 40 includes: a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7;

[0208] One end of the fifth resistor R5 is connected to the source of the first MOS tube Q2, and the other end is connected to one end of the sixth resistor R6. The end of the sixth resistor R6 connected to the fifth resistor R5 is also connected to the other end of the seventh resistor R7. The other end of the sixth resistor R6 is connected to the emitter of the first transistor Q1, and the other end of the seventh resistor R7 is connected to the input end of the control module 10.

[0209] The fifth resistor R5 and the sixth resistor R6 are high-resistance resistors constituting the no-load load 40 module, and the two are connected together to provide a very large equivalent load resistance.

[0210] Specifically, one end of the fifth resistor R5 is connected to the source of the first MOS tube Q2 at the output end of the built-in battery load, and the other end is connected to one end of the sixth resistor R6; the other end of the sixth resistor R6 is connected to the seventh resistor R7 and the emitter of the first transistor Q1. When the no-load load 40 is working, the fifth resistor R5 and the sixth resistor R6 are connected in series, and together with the seventh resistor R7, they form a huge resistance circuit, so that the current from the electric circuit of the built-in battery is extremely small, approximately zero, to achieve the effect of the built-in battery equivalent to no load, so that the test system can accurately measure the no-load voltage value. The fifth resistor R5 and the sixth resistor R6 together play the role of providing a very large resistance.

[0211] In addition, the seventh resistor R7 is a protection resistor and a current limiting resistor. During the entire system operation, the seventh resistor R7 can timely prevent potential current anomalies from causing damage to the system.

[0212] In summary, when the system is connected to the no-load load 40 for diagnosis, the first filtering subunit 201 first filters the pulse noise from the built-in battery to ensure the power quality; the second filtering subunit 202 filters the driving signal of the control module 10 to ensure the signal quality; the protection subunit 203 monitors the current and voltage in real time to prevent abnormalities; the switch subunit 204 conducts the built-in battery and the no-load load 40 under the drive of the control module 10. Specifically, the first capacitor C1 filters the high-frequency noise of the built-in battery; the first resistor R1, the second resistor R2 and the second capacitor C2 form the second-level filter to filter the control signal; the first transistor Q1 and the first MOS tube Q2 constitute the switch subunit 204, which switches the connection of the built-in battery under the drive of the control signal; the third resistor R3 and the fourth resistor R4 divide the built-in battery voltage to adapt the control level. In terms of the no-load load 40, the fifth resistor R5 and the sixth resistor R6 provide a large resistance value, so that the built-in battery is equivalent to no load, and the seventh resistor R7 transmits the no-load voltage to the control module 10. In summary, the electronic components work together to accurately obtain the no-load voltage parameters.

[0213] In the embodiment of the present application, due to the use of multi-stage filtering and protection circuits in the on-off module 20, and the high-resistance no-load load 40 circuit, the noise interference of the built-in battery and the control end can be effectively filtered out to avoid misoperation, and the no-load state of the built-in battery can be accurately simulated, which effectively solves the problem that the accuracy of no-load voltage testing in the prior art is difficult to ensure, thereby improving the accuracy of the acquisition of no-load voltage parameters. Specifically, the innovation of this technical solution is that the filter protection circuit is designed at both the built-in battery end and the control end, and the no-load state of the built-in battery is accurately achieved through the high-resistance circuit. Its beneficial effects are: compared with the prior art, which cannot effectively filter out the noise at each end, the diagnostic circuit ensures the quality of the power supply and control signal through two-stage filtering, and enhances the test reliability; at the same time, the no-load load 40 circuit can accurately simulate the no-load state, stably obtain the no-load voltage, and improve the test accuracy. In short, this technical solution accurately controls the no-load state of the built-in battery through filtering protection and high-resistance load circuits, obtains more accurate no-load voltage parameters, and lays the foundation for subsequent internal resistance calculation and health judgment.

[0214] Figure 5 This is a functional module diagram of a T-BOX built-in battery health diagnosis system when connected to a load of 50. Figure 4 The same content will not be repeated below.

[0215] Figure 5 and Figure 4 The main difference is the loaded load 50 and the no-load load 40. This embodiment provides a more specific circuit implementation of the loaded load 50. Please refer to Figure 5 :

[0216] The load 50 includes: an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a third capacitor C3 and a seventh resistor R7;

[0217] Among them, since the output current value of the built-in battery is large, the present application uses the eighth resistor R8, the ninth resistor R9, the tenth resistor R10 and the eleventh resistor R11 to form a fixed resistance resistor network with load 50, which are connected together to provide a suitable equivalent load resistance.

[0218] Specifically, the two ends of the eighth resistor R8 are respectively connected to the two ends of the ninth resistor R9, the two ends of the tenth resistor R10 are respectively connected to the two ends of the eleventh resistor R11, one end of the eighth resistor R8 is also connected to the source of the first MOS tube Q2, the other end of the eighth resistor R8 is also connected to one end of the tenth resistor R10 and one end of the seventh resistor R7, the other end of the tenth resistor R10 is connected to the emitter of the first transistor Q1, the other end of the seventh resistor R7 is connected to the input end of the control module 10, one end of the third capacitor C3 is connected to the end connected to the emitter of the tenth resistor R10 and the first transistor Q1, and the other end of the third capacitor C3 is connected to the input end of the control module 10. A suitable resistance value is formed so that the built-in battery can supply power with a stable rated current and accurately simulate the rated load state of the built-in battery so that the system can measure the load working voltage. The four resistors together constitute a suitable equivalent load.

[0219] In addition, the seventh resistor R7 is a protection resistor and a current limiting resistor. During the entire system operation, the seventh resistor R7 can timely prevent potential current anomalies from causing damage to the system. The third capacitor C3 is a filter capacitor for filtering out noise signals in the load voltage signal output by the load 50.

[0220] In summary, when the system switches to work with load 50, the eighth, ninth, tenth and eleventh resistors R11 are connected to form a suitable load resistance value, so that the built-in battery can supply power with a stable rated current; the seventh resistor R7 acts as a protective resistor to prevent overcurrent; the third capacitor C3 filters the load voltage. Specifically, the two ends of the eighth resistor R8 are connected to the two ends of the ninth resistor R9 to form a suitable resistance network, so that the built-in battery discharges to generate a stable rated current, simulating a normal working state, and the system measures the load voltage value at this time. The seventh resistor R7 prevents current abnormalities, and the third capacitor C3 filters out noise in the load voltage. The electronic components cooperate to achieve accurate acquisition of voltage under load.

[0221] In the embodiment of the present application, since a fixed resistance resistor network is used to form the load 50, as well as a protective resistor and a filter capacitor, the rated load state of the built-in battery can be accurately simulated, and current anomalies and noise interference are prevented, which effectively solves the problem that the accuracy of the load voltage test in the prior art is difficult to ensure, and improves the accuracy of the acquisition of the load voltage parameters. Specifically, the innovation of this technical solution is to accurately achieve the rated load through a fixed resistance resistor network and design a protective filter circuit. Its beneficial effect is that the diagnostic circuit can accurately reach the rated load state through a resistor network composed of four resistors, stably obtain the load voltage value, and prevent overcurrent from damaging the system, thereby improving the test accuracy and reliability. In short, this technical solution accurately simulates the rated load state of the built-in battery through a resistor network, a protective resistor and a filter capacitor, obtains more accurate load voltage parameters, and lays the foundation for subsequent internal resistance calculation and health judgment.

[0222] An embodiment of the present application also provides a vehicle, in which the above-mentioned T-BOX built-in battery health diagnosis system is installed.

[0223] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the method for determining the harmonic current injection control index of the present application. More simple transformations based on this technical concept are all within the scope of protection of the present application.

[0224] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A T-BOX built-in battery health diagnosis method, characterized in that: The T-BOX built-in battery health diagnosis method comprises: Measure the no-load voltage of the built-in battery; Measuring a load voltage value of the built-in battery when it is loaded; Calculating the internal resistance of the built-in battery according to the no-load voltage value and the load voltage value; The internal resistance value is compared with a preset threshold value to obtain the battery health status.

2. The method according to claim 1, characterized in that The step of measuring the load voltage value of the built-in battery when it is loaded specifically includes: Connecting a no-load load to both ends of the built-in battery, wherein the no-load load is used to control both ends of the built-in battery to be electrically equivalent to a disconnected state; When both ends of the built-in battery are in a disconnected state, a no-load voltage value at both ends of the built-in battery is measured.

3. The method according to claim 2, characterized in that The step of measuring the load voltage value of the built-in battery when it is loaded specifically includes: When the no-load voltage value measurement is completed, disconnecting the no-load load from the built-in battery, and connecting a loaded load to both ends of the battery; When the on-load load is connected to the built-in battery, the built-in battery is controlled to discharge, and the load voltage value is obtained during the discharge process of the built-in battery.

4. The method according to claim 1, characterized in that The step of comparing the internal resistance value with a preset threshold value to obtain a battery health status specifically includes: When the internal resistance value is less than the preset threshold value, it is determined that the built-in battery is in a healthy state at this time; When the internal resistance value is greater than or equal to the preset threshold, it is determined that the built-in battery is in an unhealthy state.

5. A T-BOX built-in battery health diagnosis system, characterized in that: The T-BOX built-in battery health diagnosis device includes: a control module, an on-off module, a load connection port, an unloaded load, and a loaded load; The input end of the on-off module is connected to the built-in battery, the control end is connected to the output end of the control module, the output end is connected to the load connection port, the load connection port is also connected to the control module, and the input end of the control module is connected to the load connection port; The control module is used to generate a detection signal and transmit the detection signal to the on-off module; The on-off module is used to conduct the connection between the built-in battery and the load connection port when receiving the detection signal; The control module is used to measure the no-load voltage value of the built-in battery when the load connection port is connected to the no-load load, and to measure the load voltage value of the built-in battery when the load connection port is connected to the loaded load; The control module is also used to determine the internal resistance value of the built-in battery according to the no-load voltage value and the load voltage value, and compare the internal resistance value with a preset threshold value to obtain the battery health status.

6. The T-BOX built-in battery health diagnosis system as claimed in claim 5, characterized in that: The on-off module includes: a first filtering subunit, a second filtering subunit, a protection subunit and a switch subunit; One end of the first filter subunit is connected to the built-in battery, and the other end is connected to the ground; One end of the protection subunit is connected to the built-in battery, and the other end is connected to the switch subunit; One end of the switch subunit is connected to the built-in battery, one end is connected to the ground, and one end is connected to the output end of the control module; One end of the second filter subunit is connected to one end of the switch subunit connected to the control module, one end is connected to the output end of the control module, and one end is grounded.

7. The T-BOX built-in battery health diagnosis system according to claim 6, characterized in that: The first filtering subunit includes: a first capacitor, the second filtering subunit includes: a second capacitor, a first resistor and a second resistor, the protection subunit includes: a third resistor and a fourth resistor, and the switch subunit includes a first MOS tube and a first transistor; One end of the first capacitor is connected to the built-in battery, and the other end is connected to the ground; One end of the first resistor is connected to the ground, and the other end is connected to the second capacitor and the second resistor at the same time, the other end of the second capacitor is connected to the ground, and the other end of the second resistor is connected to the output end of the control module; The base of the first transistor is connected to the second resistor and one end of the first resistor is connected, the emitter of the first transistor is connected to the ground and the load module, the collector of the emitter is connected to the gate of the first MOS tube, the source of the first MOS tube is connected to the load module, and the drain of the first MOS tube is connected to the built-in battery; One end of the third resistor is connected to the emitter of the first transistor, and the other end is connected to the gate of the first MOS tube. One end of the fourth resistor is connected to the built-in battery, and the other end is connected to the gate of the first MOS tube.

8. The T-BOX built-in battery health diagnosis system as claimed in claim 7, characterized in that: The no-load load includes: a fifth resistor, a sixth resistor and a seventh resistor; One end of the fifth resistor is connected to the source of the first MOS tube, and the other end is connected to one end of the sixth resistor. The end of the sixth resistor connected to the fifth resistor is also connected to the other end of the seventh resistor. The other end of the sixth resistor is connected to the emitter of the first transistor, and the other end of the seventh resistor is connected to the input end of the control module.

9. The T-BOX built-in battery health diagnosis system as claimed in claim 8, characterized in that: The load includes: an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a third capacitor and a seventh resistor; The two ends of the eighth resistor are respectively connected to the two ends of the ninth resistor, the two ends of the tenth resistor are respectively connected to the two ends of the eleventh resistor, one end of the eighth resistor is also connected to the source of the first MOS tube, the other end of the eighth resistor is also connected to one end of the tenth resistor and one end of the seventh resistor, the other end of the tenth resistor is connected to the emitter of the first transistor, the other end of the seventh resistor is connected to the input end of the control module, one end of the third capacitor is connected to one end connected to the tenth resistor and the emitter of the first transistor, and the other end of the third capacitor is connected to the input end of the control module.

10. A vehicle, characterized in that: The vehicle includes the T-BOX built-in battery health diagnostic system as described in any one of claims 5 to 9.

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