WO2022007709A1

WO2022007709A1 - Vehicle storage battery detection method and battery detection device

Info

Publication number: WO2022007709A1
Application number: PCT/CN2021/104091
Authority: WO
Inventors: 唐新光
Original assignee: 深圳市道通科技股份有限公司
Priority date: 2020-07-07
Filing date: 2021-07-01
Publication date: 2022-01-13
Also published as: CN111751748A

Abstract

A vehicle storage battery detection method and a battery detection device (100). The method comprises: obtaining the initial voltage of a storage battery (200) to be detected, and the discharge voltage of said storage battery (200) for discharging at a preset discharge condition; calculating the voltage reduction value of said storage battery (200) as a difference value between the initial voltage and the discharge voltage; then obtaining the battery features of said storage battery (200), and according to the voltage reduction value, the battery features, and preset mapping relationships, determining whether said storage battery (200) needs to be replaced. That is, said storage battery (200) is controlled to perform discharging at the preset discharge condition to obtain the voltage reduction value, and according to the voltage reduction value, the battery features of said storage battery (200), and the preset mapping relationships, it can be determined whether said storage battery (200) needs to be replaced, thereby making detection be rapid and accurate, and improving detection efficiency.

Description

A kind of vehicle battery detection method and battery detection equipment

This application claims the priority of the Chinese patent application filed on July 7, 2020 with the application number 202010647710.9 and the application title is "a vehicle battery testing method and battery testing equipment", the entire contents of which are incorporated by reference in this application.

technical field

The present application relates to the technical field of battery detection, and in particular, to a detection method and battery detection device for a vehicle battery.

Background technique

The vehicle battery is a necessary part of the vehicle operation, such as the most common lead-acid battery used in electric vehicles, etc., not only used to start the car, but also used to support all electronic loads on the car, such as ECU, etc. In the process of use, it is extremely important to be able to determine whether the vehicle battery needs to be replaced in advance, so that the user can clearly understand the load capacity of the battery and replace it with a new battery in time, so as to avoid the risk of starting and running, for example, during long-distance driving, the battery is damaged halfway, Or, it cannot carry loads such as the ECU of the car.

At present, for open-type batteries, the quality of the battery can be detected by observation method, discharge method, specific gravity measurement, etc., to determine whether it needs to be replaced. But for sealed batteries, the internal condition of the battery cannot be seen by observation, and the specific gravity of the electrolyte cannot be measured. Generally, the discharge method (input a large current to the battery to observe the battery characteristics) or the conductance method (input a small signal to the battery to Calculate the conductance value or other value that represents the characteristics of the battery) Check the quality of the battery to determine whether it needs to be replaced.

In the process of implementing the embodiments of the present invention, the inventor of the present invention found that: at present, when the battery is detected by the discharge method, the measurement time is long, the measurement process will generate a large amount of heat energy, and the measurement cannot be repeated continuously, and the test error is large; When testing batteries, there are problems of inaccuracy and troublesome measurement.

SUMMARY OF THE INVENTION

The main technical problem solved by the embodiments of the present invention is to provide a vehicle battery detection method and battery detection device, which can quickly and accurately determine whether the battery to be tested needs to be replaced.

In order to solve the above technical problems, in the first aspect, the embodiment of the present invention provides a detection method for a vehicle battery, including:

Obtain the initial voltage of the battery to be tested and the battery characteristics of the battery to be tested;

Acquiring the discharge voltage of the battery to be tested under the preset discharge condition;

Calculate the voltage drop value of the battery to be tested as the difference between the initial voltage and the discharge voltage;

Determine whether the battery to be tested needs to be replaced according to the voltage drop value, the battery characteristics and the preset mapping relationship;

The preset mapping relationship includes the corresponding relationship between the battery characteristics and the voltage drop interval, and the lower limit value of the voltage drop interval is determined by the voltage drop value obtained by the new battery according to the preset discharge condition. The upper limit of the drop interval is determined by the voltage drop value obtained by the critical battery according to the preset discharge condition, and the critical battery is a battery with a battery capacity of 80% of the rated capacity.

In some embodiments, the battery characteristics include battery type, and at least one of rated battery capacity and rated battery voltage.

In some embodiments, the preset discharge condition includes discharging the battery under test for a preset duration according to a preset discharge current.

In some embodiments, the obtaining the discharge voltage of the battery to be tested when the battery is discharged under a preset discharge condition includes:

collecting a plurality of voltages discharged from the battery to be measured according to a preset sampling rate within a period of time that includes the cut-off time point in the preset time period;

The discharge voltage is determined to be an average value of the plurality of voltages.

In some embodiments, determining whether the battery to be tested needs to be replaced according to the voltage drop value, the battery characteristics and the preset mapping relationship includes:

determining a voltage drop interval corresponding to the battery characteristic in the preset mapping relationship;

It is determined whether the voltage drop value falls within the voltage drop range, and if so, it is determined that the battery to be tested does not need to be replaced, and if no, it is determined that the battery to be tested needs to be replaced.

In some embodiments, the preset mapping relationship includes a corresponding relationship between an initial voltage, a battery characteristic and a voltage drop interval;

The determining whether the battery to be tested needs to be replaced according to the voltage drop value, the battery characteristics and the preset mapping relationship includes:

determining a voltage drop interval corresponding to the initial voltage and the battery characteristic in the preset mapping relationship;

In order to solve the above-mentioned technical problems, in the first aspect, an embodiment of the present invention provides a battery detection device, and the battery detection device includes:

a first connection end, a second connection end, a third connection end and a fourth connection end, wherein the first connection end, the second connection end, the third connection end and the fourth connection end are respectively Used to connect the battery to be tested;

a discharge circuit, electrically connected to the battery to be tested through the first connection end and the fourth connection end, and used to trigger the battery to be tested to discharge under a preset discharge condition;

a voltage sampling circuit, which is electrically connected to the battery to be tested through the second connection terminal and the third connection terminal, and is used to detect the voltage at both ends of the battery to be tested;

a controller, which is electrically connected to the discharge circuit and the voltage sampling circuit respectively, and the controller is used for:

Acquire the initial voltage of the battery to be tested through the voltage acquisition circuit;

controlling the discharge circuit, so that the discharge circuit triggers the battery to be tested to discharge under a preset discharge condition;

Acquiring the discharge voltage of the battery to be tested under the preset discharge condition by using the voltage acquisition circuit;

In some embodiments, the discharge circuit includes a switch circuit, a load, and a current sampling circuit:

The first end of the switch circuit is connected to the first connection end, the second end of the switch circuit is connected to the controller, and the third end of the switch circuit is connected to the fourth connection end through the load;

The first end of the current sampling circuit is connected to the controller, the second end of the current sampling circuit is connected to the load, and the current sampling circuit is used to detect the discharge current of the battery to be tested;

The controller is specifically used for:

The switch circuit is adjusted according to the magnitude of the discharge current detected by the current sampling circuit, so that the battery to be tested is discharged under the preset discharge condition, wherein the preset discharge condition includes charging the battery according to the preset discharge current. The preset discharge time of the battery under test.

In some embodiments, the controller is specifically configured to:

In some embodiments, the switch circuit includes a MOS transistor and a first operational amplifier;

The non-inverting input terminal of the first operational amplifier is connected to the controller, the inverting input terminal of the first operational amplifier is connected to the source of the MOS transistor, and the output terminal of the first operational amplifier is connected to the MOS transistor The gate of the MOS transistor is connected to the first terminal of the load, and the drain of the MOS transistor is connected to the first connection terminal.

In some embodiments, the discharge circuit further includes a diode, a first end of the diode is connected to the first connection end, and a second end of the diode is connected to the drain of the MOS transistor.

In some embodiments, the current sampling circuit includes a second operational amplifier, the non-inverting input terminal of the second operational amplifier is connected to the first terminal of the load, and the inverting input terminal of the second operational amplifier is connected to the The second end of the load, the output end of the second operational amplifier is connected to the controller.

In some embodiments, the voltage sampling circuit includes:

The third operational amplifier, the non-inverting input terminal of the third operational amplifier is connected to the second connection terminal, the inverting input terminal of the third operational amplifier is connected to the third connection terminal, and the output of the third operational amplifier connected to the controller.

In some embodiments, the controller is specifically configured to:

Determine whether the voltage drop value falls within the voltage drop interval, if yes, then determine that the battery to be tested does not need to be replaced, if not, then determine that the battery to be tested needs to be replaced.

In some embodiments, the preset mapping relationship includes a corresponding relationship between an initial voltage, a battery characteristic and a voltage drop interval, and the controller is specifically configured to:

Beneficial effects of the embodiments of the present invention: Different from the situation in the prior art, the method for detecting a vehicle battery and the battery detecting device provided by the embodiment of the present invention can obtain the voltage drop by controlling the battery to be tested to discharge under a preset discharge condition. According to the voltage drop value, the battery characteristics of the battery to be tested and the preset mapping relationship, it can be determined whether the battery to be tested needs to be replaced, so that the detection is fast and accurate, and the detection efficiency is improved.

Description of drawings

One or more embodiments are exemplified by the pictures in the corresponding drawings, and these exemplifications do not constitute limitations of the embodiments, and elements with the same reference numerals in the drawings are denoted as similar elements, Unless otherwise stated, the figures in the accompanying drawings do not constitute a scale limitation.

FIG. 1 is a schematic diagram of a circuit structure of a battery detection device according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the circuit structure of the discharge circuit and the voltage sampling circuit shown in FIG. 1;

3 is a schematic diagram of circuit connection of a battery detection device provided by an embodiment of the present invention;

4 is a schematic flowchart of a method for detecting a vehicle battery according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a sub-flow of step 420 shown in FIG. 4;

FIG. 6 is a schematic diagram of a sub-flow of step 440 shown in FIG. 4;

FIG. 7 is a detection area diagram provided by an embodiment of the present invention;

FIG. 8 is a schematic diagram of another sub-flow of step 440 shown in FIG. 4 .

detailed description

The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.

It should be noted that, if there is no conflict, various features in the embodiments of the present invention may be combined with each other, which are all within the protection scope of the present application. In addition, although the functional modules are divided in the schematic diagram of the device, and the logical sequence is shown in the flowchart, in some cases, the modules in the device may be divided differently, or the sequence shown in the flowchart may be performed. or the described steps. In addition, the words "first", "second" and "third" used herein do not limit the data and execution order, but only distinguish the same or similar items with substantially the same function and effect.

Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the technical field of the present invention. The terms used in the description of the present invention in this specification are only for the purpose of describing specific embodiments, and are not used to limit the present invention. As used in this specification, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

Please refer to FIG. 1 , which is a schematic diagram of a circuit structure of a battery detection device according to an embodiment of the present invention. As shown in FIG. 1 , the battery detection device 100 is electrically connected to the battery to be tested 200 , and the battery detection device 100 includes a discharge circuit 10 , a voltage sampling circuit 20 and a controller 30 .

As shown in FIG. 2 , the battery detection device 100 includes a first connection end 101 , a second connection end 102 , a third connection end 103 and a fourth connection end 104 . The first connection end 101 , the second connection end 101 and the second connection end 104 The terminal 102 , the third connection terminal 103 and the fourth connection terminal 104 are respectively used to connect the battery to be tested. In this embodiment, the first connection end 101 and the second connection end 102 are both electrically connected to the positive electrode of the battery under test 200 , and the third connection end 103 and the fourth connection end 104 are both electrically connected It is electrically connected to the negative electrode of the battery to be tested 200 . In some embodiments, the first connection end 101 , the second connection end 102 , the third connection end 103 and the fourth connection end 104 can also be Kelvin connectors, that is, the battery testing device 100 passes through the Kelvin connectors. The connector electrically connects the battery under test 200 , which can eliminate wiring, and eliminate resistance generated by contact connection when current flows through the positive or negative electrode of the battery under test 100 .

For the above-mentioned discharge circuit 10, the battery under test 200 is electrically connected through the first connection end 101 and the fourth connection end 104, so as to trigger the battery under test 200 to discharge. When the discharge circuit 10 is in an on state, the discharge circuit 10 and the battery to be tested 200 form a discharge loop, triggering the battery to be tested 100 to discharge.

In some of the embodiments, please refer to FIG. 2 together, the discharge circuit 10 includes a switch circuit 11 , a load 12 and a current sampling circuit 13 .

The first end of the switch circuit 11 is connected to the first connection end 104 , the second end of the switch circuit 11 is connected to the controller 30 , and the third end of the switch circuit 11 is connected to the controller 30 through the load 12 . The fourth connection terminal 104 is used to close or open the discharge circuit between the switch circuit 11, the load 12 and the battery to be tested 200 according to the voltage signal sent by the controller 30, and to adjust the The degree of conduction of the discharge circuit.

The first end of the current sampling circuit 13 is connected to the controller 30 , the second end of the current sampling circuit 13 is connected to the load 12 , and the current sampling circuit 13 is used to detect the switch circuit 11 and the load 12 and the current in the discharge circuit formed by the battery to be tested 200 , that is, the discharge current of the battery to be tested 200 .

The controller 30 adjusts the switch circuit 11 according to the magnitude of the discharge current detected by the current sampling circuit 20, so that the battery to be tested 200 is discharged under the preset discharge condition, wherein the preset discharge The condition includes discharging the battery under test 200 for a preset duration according to a preset discharge current.

In some embodiments, please refer to FIG. 3 , the switch circuit 11 includes a MOS transistor Q and a first operational amplifier U1 , and the non-inverting input terminal of the first operational amplifier U1 is connected to the controller 30 (the DAC port of the microcontroller U4 ) ), the inverting input terminal of the first operational amplifier U1 is connected to the source of the MOS transistor Q, the output terminal of the first operational amplifier U1 is connected to the gate of the MOS transistor Q, the The source is connected to the first terminal of the load 12 , and the drain of the MOS transistor Q is connected to the first connection terminal 101 . The second end of the load 12 is connected to the fourth connection end 104 , and the fourth connection end 104 is electrically connected to the negative electrode of the battery under test 200 .

When the MOS transistor Q is disconnected, the voltage of the first terminal of the load 12 and the source voltage of the MOS transistor Q are both the negative voltage of the battery to be tested 200, that is, the first operation The negative voltage is input to the inverting input terminal of the amplifier U1. When the controller 30 sends a voltage signal to the non-inverting input terminal of the first operational amplifier U1, the first operational amplifier U1 processes the voltage signal and the negative voltage, and outputs a first driving signal until The gate of the MOS transistor Q, so that a voltage difference VGS is formed between the gate and the source of the MOS transistor Q. Wherein, the magnitude of the first driving signal is related to the magnitude of the voltage signal. By adjusting the voltage signal, the first driving signal is further adjusted, so that when the voltage difference VGS is greater than the turn-on voltage of the MOS transistor Q, the MOS transistor Q is turned on, and the discharge loop generates current, that is, The battery to be tested 200 begins to discharge.

When the MOS transistor Q is turned on, the discharge current flows through the load 12 , and the voltage of the first end of the load 12 increases, that is, the voltage of the first end of the load 12 is equivalent to the voltage of the load 12 . The voltage drop value of the load 12 is sent to the inverting input terminal of the first operational amplifier U1 as a voltage drop signal. Due to the negative feedback effect of the first operational amplifier U1, after processing the voltage signal and the voltage drop signal, the first operational amplifier U1 will output a stable second driving signal to the MOS transistor Q's gate. Under the action of the stable second driving signal, the conduction degree of the MOS transistor Q is certain, and the internal resistance of the channel of the MOS transistor Q is stable, so that the discharge current in the discharge loop can be ensured to be stable. In addition, the magnitude of the second driving signal is related to the magnitude of the voltage signal sent by the controller 30 , so that a stable discharge current of a corresponding magnitude can be obtained by adjusting the voltage signal sent by the controller 30 .

In some embodiments, the load 12 includes a resistor, a first terminal of the resistor is electrically connected to the source of the MOS transistor Q, and a second terminal of the resistor is electrically connected to the fourth connection terminal 104 . The resistance value of the resistor can be set according to the actual situation, for example, the resistance value of the resistor is 10 mΩ, so that the discharge current of the battery to be tested 200 can be a large current.

In some embodiments, the current sampling circuit 13 includes a second operational amplifier U2, the non-inverting input terminal of the second operational amplifier U2 is connected to the first terminal of the load 12, and the inverting phase of the second operational amplifier U2 The input terminal is connected to the second terminal of the load 12, and the output terminal of the second operational amplifier U2 is connected to the controller. Therefore, the voltage of the first terminal of the load 12 is input to the non-inverting terminal of the second operational amplifier U2, and the voltage of the second terminal of the load 12 is input to the inverting terminal of the second operational amplifier U2. After processing by the operational amplifier U2, the voltage across the load 12 is obtained and sent to the controller 30, and the controller 30 can determine the flow through the The current of the load 12 is the discharge current in the discharge circuit.

In some embodiments, the discharge circuit 10 further includes a diode D1, a first end of the diode D1 is connected to the first connection end 101, and a second end of the diode D1 is connected to the The drain of the MOS transistor Q, the diode D1 is used to prevent the discharge current from flowing back into the battery under test 200 . When the first connection terminal 101 is connected to the positive electrode of the battery to be tested 200, the anode of the diode D1 is connected to the first connection terminal 101, and the cathode of the diode D1 is connected to the MOS transistor The drain of Q uses the unidirectional conductivity of the diode D1, so that in the discharge circuit, the discharge current always flows from the positive electrode of the battery to be tested 200 through the MOS transistor Q and the load 12, and finally flows back to The negative electrode of the battery to be tested 200 prevents current from flowing backwards and burns the battery to be tested 200 .

For the above-mentioned voltage sampling circuit 20 , the battery under test 200 is electrically connected through the second connection end 102 and the third connection end 103 for detecting the voltage across the battery under test 200 . When the discharge circuit 10 is in the disconnected state, the voltage at both ends of the battery under test 200 collected by the voltage sampling circuit 20 is the initial voltage; when the discharge circuit 10 is in the connected state, the battery under test 200 is discharged, and the voltage at both ends of the battery to be tested 200 collected by the voltage sampling circuit 20 is the voltage after discharge.

In some embodiments, the voltage sampling circuit 20 includes a third operational amplifier U3, the non-inverting input terminal of the third operational amplifier U3 is connected to the second connection terminal 102, and the inverting input terminal of the third operational amplifier U3 The terminal is connected to the third connection terminal 103 , and the output terminal of the third operational amplifier U3 is connected to the controller 30 . In this embodiment, the second connection end 102 is connected to the positive electrode of the battery to be tested 200 , and the third connection end 103 is connected to the negative electrode of the battery to be tested 200 , then the third operational amplifier U3 collects the The voltage is the voltage across the battery 200 to be tested.

The above-mentioned controller 30 is electrically connected to the discharge circuit 10 and the voltage sampling circuit 20 respectively, and the controller 30 is used to obtain the initial voltage of the battery to be tested 200 through the voltage sampling circuit 20, and control the the discharge circuit, so that the discharge circuit 10 triggers the battery under test 200 to discharge under the preset discharge condition, and the voltage acquisition circuit 20 obtains the battery under test 200 to discharge under the preset discharge condition Calculate the voltage drop value of the battery under test 200 as the difference between the initial voltage and the discharge voltage, and finally, determine the voltage drop value, the battery characteristics and the preset mapping relationship according to the voltage drop value Whether the battery 200 to be tested needs to be replaced. The preset mapping relationship includes the corresponding relationship between the battery characteristics and the voltage drop interval, and the lower limit value of the voltage drop interval is determined by the voltage drop value obtained by the new battery according to the preset discharge condition. The upper limit of the drop interval is determined by the voltage drop value obtained by the critical battery according to the preset discharge condition, and the critical battery is a battery with a battery capacity of 80% of the rated capacity.

As shown in FIG. 3 , the controller 30 includes a single-chip microcomputer U4, and the single-chip microcomputer U4 can adopt 51 series, Arduino series, STM32 series, etc., and the single-chip microcomputer U4 includes a DAC port, an ADC1 port, and an ADC2 port. The DAC port of the single-chip microcomputer U4 is electrically connected to the non-inverting input terminal of the first operational amplifier U1, the ADC1 port of the single-chip microcomputer U4 is electrically connected to the output terminal of the second operational amplifier U2, and the ADC2 port of the single-chip microcomputer U4 is electrically connected to the third operational amplifier U2. The output terminal of the amplifier U3 is electrically connected.

In other embodiments, the controller 30 may also be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), an ARM (Acorn RISC Machine) or other Programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of these components; can also be any conventional processor, controller, microcontroller, or state machine; can also be implemented as a combination of computing devices, For example, a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration.

To sum up, the working process of the battery detection device 100 is as follows:

(1) When the discharge circuit 10 is disconnected and the battery to be tested 200 is not discharged, the third operational amplifier U3 performs signal processing on the voltage at both ends of the battery to be tested 200 to obtain the battery to be tested 200 initial voltage.

(2) The DAC port of the single-chip microcomputer U4 outputs a voltage signal to the non-inverting input terminal of the first operational amplifier U1, and the source voltage of the MOS transistor Q is input to the inverting input terminal of the first operational amplifier U1. At this time, The source voltage of the MOS transistor Q is the negative electrode voltage of the battery to be tested 200 . The first operational amplifier U1 performs signal processing on the voltage signal input at the non-inverting input terminal and the negative voltage input at the inverting input terminal to obtain a first driving signal, the magnitude of which is related to the magnitude of the voltage signal . The first driving signal acts on the gate of the MOS transistor Q, so that a voltage difference VGS is formed between the gate and the source of the MOS transistor Q. By adjusting the voltage signal, the first driving signal is further adjusted, so that when the voltage difference VGS is greater than or equal to the turn-on voltage of the MOS transistor Q, the MOS transistor Q is turned on, and the discharge loop generates a current , that is, the battery under test 200 starts to discharge.

When the MOS transistor Q is turned on, the discharge current flows through the load 12 , and the voltage of the first end of the load 12 increases, that is, the voltage of the first end of the load 12 is equivalent to the voltage of the load 12 . The voltage drop value of the load 12 is sent to the inverting input terminal of the first operational amplifier U1 as a voltage drop signal. Due to the negative feedback effect of the first operational amplifier U1, after processing the voltage signal and the voltage drop signal, the first operational amplifier U1 will output a stable second driving signal to the MOS transistor Q's gate. Under the action of the stable second drive signal, the battery to be tested 200 is discharged with a stable discharge current, wherein the magnitude of the discharge current is related to the magnitude of the second drive signal, and further, the discharge current The size is related to the voltage signal input by the controller 30 . Therefore, by adjusting the voltage signal, the battery to be tested 200 can be discharged for a preset duration at a preset discharge current.

When the battery under test 200 is discharged at the preset discharge current, the battery under test 200 generates a discharge voltage. The third operational amplifier U3 performs signal processing on the discharge voltage to obtain the discharge voltage, and sends the discharge voltage to the ADC2 port of the microcontroller U4.

When the discharge time reaches the preset duration, stop outputting the voltage signal or adjust the voltage signal, so that the voltage difference VGS between the gate and the source of the MOS transistor Q is smaller than the conduction of the MOS transistor Q When the voltage is turned on, the MOS transistor Q is turned off, and the discharge circuit of the battery to be tested 200 is cut off, and the battery to be tested 200 stops discharging.

(3) The single chip U4 calculates the voltage drop value of the battery to be tested 200 as the difference between the initial voltage and the discharge voltage.

(4) The single-chip microcomputer U4 determines whether the battery to be tested 200 needs to be replaced according to the voltage drop value, the battery characteristics and the preset mapping relationship.

The above product can execute the method provided by the embodiment of the present invention, and has corresponding functional modules and beneficial effects for executing the method. For technical details not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.

Please refer to FIG. 4 , which is a schematic flowchart of a method for detecting a vehicle battery according to an embodiment of the present invention. The method can be applied to any suitable battery detection circuit, for example, the battery detection device described in any of the above embodiments, such as As shown in Figure 4, the detection method includes:

Step 410: Obtain the initial voltage of the battery to be tested and the battery characteristics of the battery to be tested.

The initial voltage is the voltage at both ends of the battery to be tested when the battery is not discharged, and can be obtained by detecting the voltage at both ends of the positive and negative electrodes of the battery to be tested when the battery is in an open circuit. The battery characteristics refer to the unique properties of the battery, such as factory parameters and rated parameters of the battery.

In some embodiments, the battery characteristics include battery type, and at least one of rated battery capacity and rated battery voltage. For example, when the battery feature includes a battery type, the battery feature may be an AGM-type battery, an EFB-type battery, or a Flooded-type battery. In this embodiment, acquiring the battery characteristics of the battery to be tested is to acquire the battery type of the battery to be tested. When the feature to be tested includes the battery type and the rated battery capacity, acquiring the battery feature of the battery to be tested is to obtain the battery type and rated battery capacity of the battery to be tested, respectively. It can be understood that these battery characteristics can be obtained from the nameplate of the battery to be tested, or from the factory data of the battery to be tested.

Step 420: Acquire a discharge voltage of the battery to be tested that is discharged under a preset discharge condition.

The discharge voltage is the voltage at both ends of the positive and negative electrodes of the battery to be tested collected during the process of discharging the battery to be tested under a preset discharge condition.

The preset discharge current may be set according to the rated parameters of the battery to be tested, for example, by presetting the corresponding relationship between the rated parameters and the preset discharge current, and combining the rated parameters to determine the preset discharge current. In some embodiments, the preset discharge current may be determined according to the rated current of the battery to be tested, for example, the preset discharge current is less than the rated current, accounting for a preset percentage of the rated current. If the rated current is relatively high, the preset percentage can be reduced to reduce the heat generated by the discharge of the battery under test. It can be understood that the preset discharge current can also be set manually according to historical experience values, for example, the preset discharge current is a large current such as 10A, 20A or 30A. In addition, in order to stabilize the preset discharge current to a preset value, a preset value of the preset discharge current is set in the battery detection device, and according to the preset discharge current and the current pre-stored in the battery detection device- A voltage signal relationship table, outputting a voltage signal to control the discharge current of the battery under test to be equal to the preset discharge current, that is, the current of the discharge circuit between the battery detection device and the battery under test is equal to the preset discharge current current.

The preset duration refers to the duration that the battery to be tested is discharged at the preset discharge current. The discharge current is a large current, and the preset duration is short. In some embodiments, the preset duration is in the order of milliseconds, for example, the preset duration is 50ms, 100ms, 200ms, or 300ms, or the like. The preset duration is related to the discharge current. For example, when the discharge current is relatively large, a shorter preset duration can be selected for discharging. It is detected whether the battery to be tested needs to be replaced by discharging for a short preset time. On the one hand, the detection time is saved, and it can be quickly determined whether the battery to be tested needs to be replaced, which improves the detection efficiency. The preset duration is milliseconds, and the discharge time is short, which can prevent the battery to be tested from generating a large amount of heat, so that no additional heat sink is required during the detection process.

In order to make the discharge voltage more accurate, in some embodiments, referring to FIG. 5 , the step 420 specifically includes:

Step 421 : Collect a plurality of discharge voltages of the battery to be measured according to a preset sampling rate within a period of time that includes a cut-off time point in the preset time period.

Step 422: Determine that the discharge voltage is an average value of the plurality of voltages.

The plurality of voltages are obtained by sampling the discharge voltages within a time period including a cut-off time point in the preset time period at a certain sampling rate. Wherein, the time period including the cut-off time point in the preset time period is the period from a certain time point in the preset time period to the cut-off time point, that is, the end of the preset time period. For example, when the preset duration is 100ms and the preset sampling rate is 1ms, in the 91ms-100ms period of the preset duration, the sampling rate is sampled every 1ms to obtain the voltage values V1, V2. .V10, where V1 corresponds to the discharge voltage at 91ms, V2 corresponds to the discharge voltage at 92ms, and so on, V10 corresponds to the discharge voltage at 100ms. Then, the average value Va of the plurality of voltages is calculated and used as the discharge voltage.

Specifically, the preset duration is accumulated by means of a timer, and when the discharge time of the battery to be tested reaches the preset duration, the timer reaches a set stop threshold, triggering the battery to be tested to stop discharge. During the preset time period, that is, during the discharge process of the battery to be tested, count 0 at a preset sampling rate by means of a counter. When n=0, collect the initial voltage of the battery to be tested. When the counter n is greater than the preset number, for example, when n>90, the number is collected every preset sampling rate, for example, every 1ms, until the counter reaches the stop threshold set in the timer, then stop Pick numbers. When the counter n is greater than the preset number, the collected voltage is the discharge voltage at the end of the preset duration. In some embodiments, prior to starting the timer and counter, the method further includes initializing the battery detection device.

In this embodiment, by collecting multiple voltages at the end of the preset duration, and using the average value of the multiple voltages as the discharge voltage, the risk of errors can be reduced, abnormal data can be eliminated, and the accuracy of the discharge voltage can be increased .

Step 430: Calculate the voltage drop value of the battery to be tested as the difference between the initial voltage and the discharge voltage.

After the battery to be tested is discharged for the preset time period, the voltage across the battery to be tested will decrease. After the initial voltage and the discharge voltage are obtained, the difference between the initial voltage and the discharge voltage is calculated as the voltage drop value of the battery to be tested.

Step 440: Determine whether the battery to be tested needs to be replaced according to the voltage drop value, the battery characteristics and the preset mapping relationship.

The preset mapping relationship may be pre-built and stored in the battery detection device. The preset mapping relationship includes the corresponding relationship between the battery characteristics and the voltage drop interval, the lower limit value of the voltage drop interval is determined by the voltage drop value obtained by the new battery according to the preset discharge condition, and the voltage drop interval is determined. The upper limit value of is determined by the voltage drop value obtained by the critical battery according to the preset discharge condition, and the critical battery is a battery with a battery capacity of 80% of the rated capacity.

The battery characteristics correspond to the voltage drop intervals one-to-one. For example, the voltage drop intervals corresponding to the battery characteristics C1, C2, and Cn are S1, S2, and Sn. In some embodiments, the battery characteristics include a battery type, and at least one of a rated battery capacity and a rated battery voltage, that is, the battery type, and at least one of a rated battery capacity and a rated battery voltage constitute the Describe the battery characteristics. Wherein, both the rated battery capacity and the rated battery voltage can be classified by ranges, for example, the rated battery capacity includes 0-50Ah/50-100Ah/100Ah or more, or includes 0-30Ah/30-60Ah /60-90Ah/90-120Ah etc. For example, when battery feature C1=(battery type, rated battery capacity), the battery is divided into features according to battery type and rated battery capacity. In the preset mapping relationship, each battery feature corresponds to a voltage drop interval. Therefore, after determining the voltage drop value and battery characteristics of the battery to be tested, in the preset mapping relationship, after finding out the battery characteristics corresponding to the battery characteristics of the battery to be tested, the corresponding voltage can be obtained. drop interval.

Wherein, the lower limit value of the voltage drop interval is determined by the voltage drop value obtained by the new battery according to the preset discharge condition. The new battery refers to a battery that has passed the new factory inspection and can be used as a reference for judging the voltage drop. When constructing the preset mapping relationship, the new battery is classified according to the battery characteristics, the voltage drop value of the new battery can be calculated according to

steps

410, 420 and 430, and the voltage drop of the new battery can be calculated. The pressure drop value is used as the lower limit value of the pressure drop interval, and is recorded in the preset mapping relationship.

As the battery is used, the battery will gradually age, the battery capacity will decrease, and the voltage drop will increase. When the battery capacity is lower than 80% of the rated battery capacity, the battery capacity may drop in a diving manner, resulting in insufficient load capacity of the battery. The load carrying capacity of the battery refers to the output power when the battery drives the load to work when the battery supplies power to the load. That is, when the battery capacity is lower than 80% of the rated battery capacity, the output power of the battery is not enough to drive the load to work.

Therefore, a battery with a battery capacity of 80% of the rated battery capacity is used as a critical battery, and a voltage drop value is obtained according to the preset discharge conditions, as the upper limit value of the voltage drop interval, which is used to compare and judge the to-be-measured battery. The load capacity of the battery. When constructing the preset mapping relationship, the critical battery is classified according to the battery characteristics, and the voltage drop value of the critical battery can be calculated according to step 410, step 420 and step 430, and the voltage drop of the critical battery can be calculated. The pressure drop value is used as the upper limit value of the pressure drop interval, and is recorded in the preset mapping relationship.

In this embodiment, for each battery feature, it is determined whether the load capacity of the battery to be tested is based on the voltage drop value of the battery to be tested, the voltage drop value of the new battery, and the voltage drop value of the critical battery. If the load capacity of the battery to be tested is insufficient, the battery to be tested needs to be replaced; otherwise, the battery to be tested can continue to be used. In addition, the pressure drop test time is short, simple and efficient.

In some embodiments, referring to FIG. 6 , the step 440 further includes:

Step 441a: Determine the voltage drop interval corresponding to the battery characteristic in the preset mapping relationship.

Through battery feature matching, a battery feature corresponding to the battery feature of the battery to be tested is found in the preset mapping relationship, and a corresponding voltage drop interval can be determined according to the preset mapping relationship.

Step 442a: Determine whether the voltage drop value falls within the voltage drop range, if yes, determine that the battery to be tested does not need to be replaced, if not, determine that the battery to be tested needs to be replaced.

If the voltage drop value of the battery to be tested falls within the voltage drop interval, the voltage drop value is greater than or equal to the lower limit of the voltage drop interval, and less than or equal to the upper limit of the voltage drop interval value. That is, when the load carrying capacity of the battery to be tested is greater than the load carrying capacity of the critical battery and smaller than the load carrying capacity of the new battery, the load carrying capacity of the battery to be tested is sufficient and does not need to be replaced. If the voltage drop value of the battery to be tested is outside the voltage drop range, the voltage drop value is greater than the upper limit of the voltage drop range, and the load capacity of the battery to be tested is smaller than the critical battery With load capacity, the battery under test has insufficient load capacity and needs to be replaced, or if the voltage drop value is less than the lower limit of the voltage drop interval, the battery under test is abnormal and needs to be replaced.

In this embodiment, the voltage drop value is obtained by controlling the battery to be tested to discharge under a preset discharge condition. According to the voltage drop value, the battery characteristics of the battery to be tested and the preset mapping relationship, that is, It can be determined whether the battery to be tested needs to be replaced, so that the detection is fast and accurate, and the detection efficiency is improved.

In order to make the preset mapping relationship more accurate, considering the influence of the initial voltage of the battery on the voltage drop interval, in some embodiments, the preset mapping relationship includes the corresponding relationship between the initial voltage, battery characteristics and the voltage drop interval. As shown in Table 1, which shows a way of the preset mapping relationship, within the range of the initial voltage of 6V-14V, a voltage interval is constructed with 0.05V as an interval interval. For each of the voltage intervals and each of the battery characteristics, acquire several new batteries with initial voltages in the voltage interval and corresponding to the battery characteristics. Calculate the voltage drop value of the new battery according to

steps

410, 420 and 430 for the several new batteries, and use the maximum voltage drop value in the several new batteries as the lower limit value of the voltage drop interval . Repeat the above operations to cover each voltage interval between 6V and 14V, and obtain the lower limit value of the voltage drop interval corresponding to each voltage interval and each battery characteristic. For example, for 50 new batteries with a rated battery capacity of 0-50Ah, a battery type of AGM, and an initial voltage of 12.75V-12.80V, the voltage drop values are obtained according to the

above steps

410, 420, and 430, respectively. The lower limit of the voltage drop interval corresponding to the initial voltage (12.75V-12.80V) and battery characteristics (battery rated capacity is 0-50Ah, battery type is AGM) is the maximum value among 50 voltage drop values.

For each of the voltage intervals and each of the battery characteristics, obtain a number of critical batteries whose initial voltage is located in the voltage interval and corresponding to the battery characteristics, and calculate the number of critical batteries according to

steps

410 , 420 and 430 for the number of temporary batteries. The voltage drop value of the critical battery, and the minimum voltage drop value among several critical batteries is used as the upper limit value of the voltage drop interval. Repeat the above operation to cover each voltage interval between 6V-14V, and obtain the upper limit value of the voltage drop interval corresponding to each voltage interval and each battery characteristic. For example, for a critical battery with a rated battery capacity of 0-50Ah, a battery type of AGM, and an initial voltage of 12.75V-12.80V, there are 50 critical batteries, and the voltage drop values are obtained according to the above steps 410-430 respectively, then the initial voltage ( 12.75V-12.80V), battery characteristics (battery rated capacity is 0-50Ah, battery type is AGM) The upper limit of the voltage drop interval corresponding to the minimum value of 50 voltage drop values.

Table 1 Default mapping relationship

It is worth noting that the interval can also be other values, such as 0.03V, 0.04V, or 0.06V, etc., which can be artificially set according to actual experience. The voltage interval can also be other interval values, such as 5V-13V, etc., which can be manually set according to the actual situation. 40 or 60 new batteries can be sampled for each voltage interval and each battery feature, and 40 or 60 critical batteries can be sampled for each voltage interval and each battery feature. The specific number can be artificially set according to the actual situation. Certainly.

In order to express the preset mapping relationship more intuitively, so as to facilitate the determination of the detection result, in some embodiments, a detection area map 500 may be established according to the preset mapping relationship in Table 1. As shown in FIG. 7 , each Each battery feature has a corresponding detection area map, for example, battery feature C1 corresponds to detection area map (a), battery feature C2 corresponds to detection area map (b), and so on, until the detection area maps corresponding to all battery features are established. Finish.

Taking the detection area diagram (a) of the pair of battery characteristics C1 as an example, the battery characteristics C1 include battery type, and at least one of rated battery capacity and rated battery voltage, and the horizontal axis of the detection area diagram (a) is In the voltage interval [X1, Xn], that is, the first column in Table 1, the vertical axis is the voltage drop value, and the detection area diagram (a) includes a first curve 501 and a second curve 502 . The region G between the first curve 501 and the second curve 502 represents the battery with sufficient load capacity and does not need to be replaced, and the region R outside the first curve 501 and the second curve 502 represents the battery with load capacity Insufficient and needs to be replaced.

The first curve 501 is the linear fitting relationship between the lower limit value of the voltage drop interval and the voltage interval in Table 1, which is the voltage drop of the new battery whose initial voltage is located in the voltage interval and corresponds to the battery characteristic C1 A curve of values. For example, when the battery characteristic C1 includes that the battery rated capacity is 0-50 Ah and the battery type is AGM, the ordinate of the midpoint of the first curve 501 is the lower limit value in the second column of Table 1. The second curve 502 is the linear fitting relationship between the upper limit value of the voltage drop interval and the voltage interval in Table 1, and is composed of the voltage drop value of the critical battery whose initial voltage is located in the voltage interval and corresponds to the battery characteristic C1. the curve. For example, when the battery characteristic C1 includes that the battery rated capacity is 0-50 Ah and the battery type is AGM, the ordinate of the midpoint of the second curve 502 is the upper limit value in the third column of Table 1.

For different battery characteristics, the first curve 501 and the second curve 502 have different curve characteristics, and the curve characteristics are functions of the curves in the coordinates.

By establishing a detection area map corresponding to the characteristics of the battery, comparison can be made intuitively, and it is convenient to determine whether the battery to be tested needs to be replaced.

In this embodiment, referring to FIG. 8, the step 440 further includes:

Step 441b: Determine the voltage drop interval corresponding to the initial voltage and the battery characteristic in the preset mapping relationship.

Step 442b: Determine whether the voltage drop value falls within the voltage drop range, if yes, determine that the battery to be tested does not need to be replaced, if not, determine that the battery to be tested needs to be replaced.

By matching the initial test voltage and the battery characteristics, a voltage drop interval corresponding to the initial voltage and the battery characteristics is found in the preset mapping relationship. For example, if the initial voltage of the battery to be tested is 6.12V, the rated battery capacity is 40Ah, the battery type is AGM, and the voltage drop value is V0, first, the initial voltage is 6.12V to locate the voltage range [6.10V, 6.15V ), that is, the 3rd row in Table 1, from the battery rated capacity of 40Ah to the battery rated capacity of 0-50Ah, and the battery type AGM to the 2nd, 3rd, and 2nd columns in Table 1. The lower limit value in the column V1 and the lower limit V2 in the third column are the corresponding voltage drop intervals.

Through the preset mapping relationship, it is determined whether the voltage drop value falls within the voltage drop interval. For example, in the example of step 441b, the voltage drop value V0 is compared with the voltage drop interval [V1, V2]. When When V1≤V0≤V2, the voltage drop value V0 falls within the voltage drop interval [V1, V2], it is determined that the battery to be tested does not need to be replaced, if V0<V1 or V0>V2, the voltage drop value V0 is not in the voltage drop Within the interval [V1, V2], it is determined that the battery to be tested needs to be replaced.

In some embodiments, the corresponding detection area map can also be determined according to the battery characteristics. The battery type is AGM), then determine the corresponding detection area map (a). In the detection area map (a), the coordinates of the battery to be tested are determined according to the initial voltage and voltage drop value of the battery to be tested. When the coordinates of the battery to be tested fall within the area G, it is determined that the battery to be tested has a sufficient load capacity and does not need to be replaced. When the coordinates of the battery to be tested fall within the region R, it is determined that the battery to be tested has insufficient load capacity and needs to be replaced.

In this embodiment, the voltage drop value is obtained by controlling the battery to be tested to discharge under a preset discharge condition. According to the voltage drop value, the battery characteristics of the battery to be tested, the initial voltage and the preset According to the mapping relationship, it can be determined whether the battery to be tested needs to be replaced, so that the detection is fast and accurate, and the detection efficiency is improved.

It should be noted that the detection method of the embodiment of the present invention uses the voltage drop value of the detection battery to confirm whether the battery needs to be replaced, so it is applicable to any suitable circuit that can detect the voltage drop of the battery. The battery described in any embodiment of the present invention The detection device is only one of the implementations.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; under the idea of the present invention, the technical features in the above embodiments or different embodiments can also be combined, The steps may be carried out in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the invention has been The skilled person should understand that it is still possible to modify the technical solutions recorded in the foregoing embodiments, or to perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the implementation of the present invention. scope of technical solutions.

Claims

A detection method for a vehicle battery, comprising:

Obtain the initial voltage of the battery to be tested and the battery characteristics of the battery to be tested;

Acquiring the discharge voltage of the battery to be tested under the preset discharge condition;

Calculate the voltage drop value of the battery to be tested as the difference between the initial voltage and the discharge voltage;

Determine whether the battery to be tested needs to be replaced according to the voltage drop value, the battery characteristics and the preset mapping relationship;

The preset mapping relationship includes the corresponding relationship between the battery characteristics and the voltage drop interval, and the lower limit value of the voltage drop interval is determined by the voltage drop value obtained by the new battery according to the preset discharge condition. The upper limit of the drop interval is determined by the voltage drop value obtained by the critical battery according to the preset discharge condition, and the critical battery is a battery with a battery capacity of 80% of the rated capacity.
The method of claim 1, wherein the battery characteristics include battery type, and at least one of a rated battery capacity and a rated battery voltage.
The method according to claim 1, wherein the preset discharge condition comprises discharging the battery under test for a preset duration according to a preset discharge current.
The method according to claim 3, wherein the acquiring the discharge voltage of the battery to be tested for discharging under a preset discharge condition comprises:

collecting a plurality of voltages discharged from the battery to be measured according to a preset sampling rate within a period of time that includes the cut-off time point in the preset time period;

The discharge voltage is determined to be an average value of the plurality of voltages.
The method according to any one of claims 1-4, wherein, determining whether the battery to be tested needs to be replaced according to the voltage drop value, the battery characteristics and the preset mapping relationship, include:

determining a voltage drop interval corresponding to the battery characteristic in the preset mapping relationship;

It is determined whether the voltage drop value falls within the voltage drop range, and if so, it is determined that the battery to be tested does not need to be replaced, and if no, it is determined that the battery to be tested needs to be replaced.
The method according to claim 1, wherein the preset mapping relationship includes a corresponding relationship between an initial voltage, a battery characteristic and a voltage drop interval;

The determining whether the battery to be tested needs to be replaced according to the voltage drop value, the battery characteristics and the preset mapping relationship includes:

determining a voltage drop interval corresponding to the initial voltage and the battery characteristic in the preset mapping relationship;

It is determined whether the voltage drop value falls within the voltage drop range, and if so, it is determined that the battery to be tested does not need to be replaced, and if no, it is determined that the battery to be tested needs to be replaced.
A battery detection device, characterized in that the battery detection device comprises:

a first connection end, a second connection end, a third connection end and a fourth connection end, wherein the first connection end, the second connection end, the third connection end and the fourth connection end are respectively Used to connect the battery to be tested;

a discharge circuit, electrically connected to the battery to be tested through the first connection end and the fourth connection end, and used to trigger the battery to be tested to discharge under a preset discharge condition;

a voltage sampling circuit, which is electrically connected to the battery to be tested through the second connection terminal and the third connection terminal, and is used to detect the voltage at both ends of the battery to be tested;

a controller, which is electrically connected to the discharge circuit and the voltage sampling circuit respectively, and the controller is used for:

Acquire the initial voltage of the battery to be tested through the voltage acquisition circuit;

controlling the discharge circuit, so that the discharge circuit triggers the battery to be tested to discharge under a preset discharge condition;

Acquire the discharge voltage of the battery to be tested under the preset discharge condition by using the voltage acquisition circuit;

Calculate the voltage drop value of the battery to be tested as the difference between the initial voltage and the discharge voltage;

Determine whether the battery to be tested needs to be replaced according to the voltage drop value, the battery characteristics and the preset mapping relationship;

The preset mapping relationship includes the corresponding relationship between the battery characteristics and the voltage drop interval, and the lower limit value of the voltage drop interval is determined by the voltage drop value obtained by the new battery according to the preset discharge condition. The upper limit of the drop interval is determined by the voltage drop value obtained by the critical battery according to the preset discharge condition, and the critical battery is a battery with a battery capacity of 80% of the rated capacity.
The battery detection device according to claim 7, wherein the discharge circuit comprises a switch circuit, a load and a current sampling circuit:

The first end of the switch circuit is connected to the first connection end, the second end of the switch circuit is connected to the controller, and the third end of the switch circuit is connected to the fourth connection end through the load;

The first end of the current sampling circuit is connected to the controller, the second end of the current sampling circuit is connected to the load, and the current sampling circuit is used to detect the discharge current of the battery to be tested;

The controller is specifically used for:

The switch circuit is adjusted according to the magnitude of the discharge current detected by the current sampling circuit, so that the battery to be tested is discharged under the preset discharge condition, wherein the preset discharge condition includes charging the battery according to the preset discharge current. The preset discharge time of the battery under test.
The battery detection device according to claim 8, wherein the controller is specifically used for:

collecting a plurality of voltages discharged from the battery to be measured according to a preset sampling rate within a period of time that includes the cut-off time point in the preset time period;

The discharge voltage is determined to be an average value of the plurality of voltages.
The battery detection device according to claim 8, wherein the switch circuit comprises a MOS transistor and a first operational amplifier;

The non-inverting input terminal of the first operational amplifier is connected to the controller, the inverting input terminal of the first operational amplifier is connected to the source of the MOS transistor, and the output terminal of the first operational amplifier is connected to the MOS transistor The gate of the MOS transistor is connected to the first terminal of the load, and the drain of the MOS transistor is connected to the first connection terminal.
The battery testing device according to claim 10, wherein the discharge circuit further comprises a diode, the first end of the diode is connected to the first connection end, and the second end of the diode is connected to the first connection end the drain of the MOS transistor.
The battery detection device according to any one of claims 8-11, wherein the current sampling circuit comprises a second operational amplifier, and a non-inverting input end of the second operational amplifier is connected to the first end of the load, The inverting input terminal of the second operational amplifier is connected to the second terminal of the load, and the output terminal of the second operational amplifier is connected to the controller.
The battery detection device according to any one of claims 7-11, wherein the voltage sampling circuit comprises:

The third operational amplifier, the non-inverting input terminal of the third operational amplifier is connected to the second connection terminal, the inverting input terminal of the third operational amplifier is connected to the third connection terminal, and the output of the third operational amplifier connected to the controller.
The battery detection device according to any one of claims 7-11, wherein the controller is specifically used for:

determining a voltage drop interval corresponding to the battery characteristic in the preset mapping relationship;

It is determined whether the voltage drop value falls within the voltage drop range, and if so, it is determined that the battery to be tested does not need to be replaced, and if no, it is determined that the battery to be tested needs to be replaced.
The battery detection device according to any one of claims 7-11, wherein the preset mapping relationship includes a corresponding relationship between an initial voltage, a battery characteristic and a voltage drop interval, and the controller is specifically configured to:

determining a voltage drop interval corresponding to the initial voltage and the battery characteristic in the preset mapping relationship;

It is determined whether the voltage drop value falls within the voltage drop range, and if so, it is determined that the battery to be tested does not need to be replaced, and if no, it is determined that the battery to be tested needs to be replaced.