Battery protection detection circuit and battery detection system

Abstract

The utility model provides a battery protection detection circuit and a battery detection system, and belongs to the technical field of electronic circuits. The circuit comprises a control processing module, a signal generation unit, a sampling resistor and a protection unit, the first output end of the control processing module is connected with the first end of the protection unit, the second output end of the control processing module is connected with the first end of the sampling resistor, and the first input end of the control processing module is connected with the second end of the sampling resistor. The second input end of the control processing module is connected with the output end of the signal generation unit; the second end of the protection unit is connected with the input end of the signal generation unit, and the third end and the fourth end of the protection unit are connected with the first end and the second end of the sampling resistor respectively. The limitation of the battery protection detection circuit can be reduced, and the effect of improving the flexibility of the battery protection detection circuit is further achieved.

Description

Technical Field

[0001] This application relates to the field of electronic circuit technology, and more specifically, to a battery protection detection circuit and a battery detection system. Background Technology

[0002] With the rapid development of technology, various mobile devices have quickly become ubiquitous in households, and these devices generally include energy storage devices such as batteries. Furthermore, these batteries undergo testing during manufacturing to verify their performance.

[0003] In related technologies, a corresponding circuit test circuit is usually set up for the battery. The current sampling circuit in the circuit test circuit is set in the negative terminal circuit of the battery, and the protection switching device used to protect the battery is set in the positive terminal circuit of the battery. Therefore, when performing protection tests on the battery, a current is usually applied to the negative terminal of the battery so that the corresponding feedback voltage and protection time can be collected through the current sampling circuit of the negative terminal, and then the test results can be obtained.

[0004] However, this approach can only perform asymmetric testing on battery protection circuits, which has significant limitations and poor flexibility. Utility Model Content

[0005] The purpose of this application is to provide a battery protection detection circuit and a battery detection system, which can reduce the limitations of battery protection detection circuits and thus improve the flexibility of battery protection detection circuits.

[0006] The embodiments of this application are implemented as follows:

[0007] A first aspect of this application provides a battery protection detection circuit, the battery protection detection circuit comprising: a control processing module, a signal generation unit, a sampling resistor, and a protection unit;

[0008] The first output terminal of the control processing module is connected to the first terminal of the protection unit, the second output terminal of the control processing module is connected to the first terminal of the sampling resistor, the first input terminal of the control processing module is connected to the second terminal of the sampling resistor, and the second input terminal of the control processing module is connected to the output terminal of the signal generating unit. The control processing module is used to output a first voltage to the protection unit, output a second voltage to the sampling resistor, stop outputting the first and second voltages under the action of the target level signal output by the signal generating unit, acquire the sampling voltage of the sampling resistor, and record the protection time.

[0009] The second terminal of the protection unit is connected to the input terminal of the signal generating unit, and the third and fourth terminals of the protection unit are connected to the first and second terminals of the sampling resistor, respectively. The protection unit is used to acquire the sampling voltage and to turn off when the sampling voltage is greater than a preset threshold. The signal generating unit is used to output the target level signal to the control processing module when the protection unit is turned off.

[0010] Optionally, the control processing module includes: a control unit, a first conversion unit, and a second conversion unit;

[0011] The first output terminal of the control unit is connected to the input terminal of the first conversion unit, the second output terminal of the control unit is connected to the first input terminal of the second conversion unit, the first input terminal of the control unit is connected to the first output terminal of the second conversion unit, and the second input terminal of the control unit is connected to the output terminal of the signal generating unit; the control unit is used to output a first digital voltage to the first conversion unit, output a second digital voltage to the second conversion unit, stop outputting the first digital voltage and the second digital voltage under the action of the target level signal, receive the sampled digital voltage output by the second conversion unit, and record the protection time;

[0012] The first output terminal of the first conversion unit is connected to the first terminal of the protection unit; the first conversion unit is used to convert the first digital voltage into the first voltage.

[0013] The second output terminal of the second conversion unit is connected to the first terminal of the sampling resistor, and the second input terminal of the second conversion unit is connected to the second terminal of the sampling resistor; the second conversion unit is used to convert the second digital voltage into the second voltage and to convert the received sampling voltage into the sampling digital voltage.

[0014] Optionally, the second conversion unit includes: a first digital-to-analog converter and a first analog-to-digital converter;

[0015] The input terminal of the first digital-to-analog converter is connected to the first output terminal of the control unit, and the output terminal of the first digital-to-analog converter is connected to the first terminal of the sampling resistor; the first digital-to-analog converter is used to convert the second digital voltage into the second voltage.

[0016] The input terminal of the first analog-to-digital converter is connected to the second terminal of the sampling resistor, and the output terminal of the first analog-to-digital converter is connected to the first input terminal of the control unit; the first analog-to-digital converter is used to convert the sampling voltage into the sampling digital voltage.

[0017] Optionally, the first conversion unit includes a second digital-to-analog converter;

[0018] The input terminal of the second digital-to-analog converter is connected to the second output terminal of the control unit, and the output terminal of the second digital-to-analog converter is connected to the first terminal of the protection unit;

[0019] The second digital-to-analog converter is used to convert the first digital voltage into the first voltage.

[0020] Optionally, the first conversion unit further includes a second analog-to-digital converter;

[0021] The input terminal of the second analog-to-digital converter is connected to the second terminal of the protection unit and the input terminal of the signal generating unit, respectively, and the output terminal of the second analog-to-digital converter is connected to the third input terminal of the control unit; the second analog-to-digital converter is used to receive the detection voltage input from the protection unit and convert the detection voltage into a digital signal and output it to the control unit;

[0022] The control unit is also used to determine whether the voltage of the digital signal meets a preset voltage.

[0023] Optionally, the control unit includes: a first control subunit and a second control subunit;

[0024] The output terminal of the first control subunit is connected to the input terminal of the first conversion unit, the first input terminal of the first control subunit is connected to the output terminal of the signal generating unit, and the control terminal of the first control subunit is connected to the control terminal of the second control subunit; the first control subunit is used to output the first digital voltage.

[0025] The output terminal of the second control subunit is connected to the first input terminal of the second conversion unit, the first input terminal of the second control subunit is connected to the output terminal of the signal generating unit, and the second input terminal of the second control subunit is connected to the first output terminal of the second conversion unit.

[0026] The second control subunit is used to output the second digital voltage, receive the sampled digital voltage, stop outputting the second digital voltage under the action of the target level signal and control the first control subunit to stop outputting the first digital voltage, and record the protection time.

[0027] Optionally, the control unit further includes a signal isolator;

[0028] The first end of the signal isolator is connected to the output end of the signal generating unit, the second and third ends of the signal isolator are respectively connected to the first input end of the first control subunit and the first input end of the second control subunit, and the fourth and fifth ends of the signal isolator are respectively connected to the control end of the first control subunit and the control end of the second control unit.

[0029] The signal isolator is used at least to forward the target level signal to the first control subunit and the second control subunit.

[0030] Optionally, the protection unit includes: a protection processor and a switching transistor;

[0031] The first and second acquisition terminals of the protection processor are respectively connected to the first and second terminals of the sampling resistor, and the control terminal of the protection processor is connected to the gate of the switching transistor; the protection processor is used to acquire the sampling voltage and output a control signal to the switching transistor when the sampling voltage is greater than a preset threshold.

[0032] The source of the switching transistor is connected to the input terminal of the signal generating unit and the positive terminal of the electrical load, respectively, and the drain of the switching transistor is used to connect to the positive terminal of the battery under test.

[0033] A second aspect of this application provides a battery detection system, characterized in that the battery detection system includes: an electronic device and any of the battery protection detection circuits described in the first aspect above.

[0034] Optionally, the battery detection system further includes: at least one serial communication device;

[0035] Each of the serial communication devices is respectively connected between the electronic device and the battery protection detection circuit.

[0036] The beneficial effects of the embodiments of this application include:

[0037] This application provides a battery protection test circuit comprising a control processing module, a signal generation unit, a sampling resistor, and a protection unit. The first output terminal of the control processing module is connected to the first terminal of the protection unit, the second output terminal of the control processing module is connected to the first terminal of the sampling resistor, the first input terminal of the control processing module is connected to the second terminal of the sampling resistor, and the second input terminal of the control processing module is connected to the output terminal of the signal generation unit. The second terminal of the protection unit is connected to the input terminal of the signal generation unit, and the third and fourth terminals of the protection unit are connected to the first and second terminals of the sampling resistor, respectively.

[0038] Because the solutions provided by related technologies can generally only apply current to the negative terminal of the battery and collect the corresponding feedback voltage and protection time through the current sampling circuit of the negative terminal to obtain test results, the solutions of related technologies cannot perform symmetrical testing of battery protection circuits.

[0039] However, in the battery protection test circuit provided in this application, the control processing module is connected to the first terminal of the protection unit and the first terminal of the sampling resistor, respectively. Therefore, the control processing module can output the first voltage and the second voltage to the positive and negative terminals of the battery protection board through the first terminal of the protection unit and the first terminal of the sampling resistor, respectively. This solves the problem that related technologies cannot simulate a load at the positive and negative terminals of the battery and test the positive and negative terminals simultaneously with the same current. Moreover, in the battery protection test circuit provided in this application, the protection unit can also shut down to cut off the transmission path of the first voltage when it detects that the sampling voltage is too high, thereby causing the signal generation unit to output the target level signal to the control processing module. This enables the protection of the battery and the synchronous output or synchronous stop of the first voltage and the second voltage, thus completing the symmetrical test of the positive and negative terminals of the battery with the same current and obtaining the test results of the symmetrical test.

[0040] In addition, the circuit provided in this application embodiment can not only perform symmetrical testing of the positive and negative terminals of the battery with equal current, but also perform asymmetrical testing of the negative terminal by applying current only to the negative terminal of the battery.

[0041] This reduces the limitations of battery protection detection circuits, thereby improving their flexibility. Attached Figure Description

[0042] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the structure of the first battery protection test circuit provided in the embodiments of this application;

[0044] Figure 2 This is a schematic diagram of the structure of the second battery protection test circuit provided in the embodiments of this application;

[0045] Figure 3 This is a schematic diagram of the structure of the third battery protection test circuit provided in the embodiments of this application;

[0046] Figure 4 This is a schematic diagram of the structure of the fourth battery protection test circuit provided in the embodiments of this application;

[0047] Figure 5 This is a schematic diagram of the structure of the fifth battery protection test circuit provided in the embodiments of this application;

[0048] Figure 6 This is a schematic diagram of the sixth battery protection test circuit provided in the embodiments of this application;

[0049] Figure 7 This is a schematic diagram of the structure of the seventh battery protection test circuit provided in the embodiments of this application;

[0050] Figure 8 This is a schematic diagram of the structure of a system provided in an embodiment of this application. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0052] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0053] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0054] In the description of this application, it should be noted that the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0055] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0056] In related technologies, a corresponding circuit test circuit is usually set up for the battery. The current sampling circuit in the circuit test circuit is set in the negative terminal circuit of the battery, and the protection switching device used to protect the battery is set in the positive terminal circuit of the battery. Therefore, when performing protection tests on the battery, a current is usually applied to the negative terminal of the battery so that the corresponding feedback voltage and protection time can be collected through the current sampling circuit of the negative terminal, and then the test results can be obtained.

[0057] For example, when users need to apply current to the positive and negative terminals of a battery or battery pack to test the battery's protection performance and the protection's response time, the relevant technical solutions can only apply current to the negative terminal of the battery, and cannot simulate a load at the positive and negative terminals of the battery respectively and test the positive and negative terminals simultaneously with the same current.

[0058] In other words, the solutions of the relevant technologies can only perform asymmetrical testing on battery protection circuits, and cannot be applied to testing the positive and negative terminals with equal current. Therefore, they have significant limitations and poor flexibility.

[0059] To address this, this application provides a battery protection detection circuit. This circuit comprises a control processing module, a signal generation unit, a sampling resistor, and a protection unit. The first output terminal of the control processing module is connected to the first terminal of the protection unit, the second output terminal of the control processing module is connected to the first terminal of the sampling resistor, the first input terminal of the control processing module is connected to the second terminal of the sampling resistor, and the second input terminal of the control processing module is connected to the output terminal of the signal generation unit. The second terminal of the protection unit is connected to the input terminal of the signal generation unit, and the third and fourth terminals of the protection unit are connected to the first and second terminals of the sampling resistor, respectively. This design reduces the limitations of traditional battery protection detection circuits, thereby improving their flexibility.

[0060] This application uses a battery protection detection circuit applied in a battery protection board of a terminal device as an example for illustration. However, it does not imply that this application embodiment can only be applied to battery protection boards in terminal devices for battery load performance detection.

[0061] Normally, the positive terminal of the battery is connected to the positive input terminal of the battery protection board, the negative terminal of the battery is connected to the negative input terminal of the battery protection board, the positive output terminal of the battery protection board is connected to the positive terminal of the electrical load, and the negative output terminal of the battery protection board is connected to the negative terminal of the electrical load. This application embodiment does not limit this.

[0062] The battery protection detection circuit provided in the embodiments of this application will be explained in detail below.

[0063] Figure 1This is a schematic diagram of a battery protection detection circuit provided in this application. This circuit can be used for battery performance testing, such as testing parameters like protection response speed, protection response time, feedback voltage, and current feedback value. This application does not limit the specific parameters described herein. See also... Figure 1 This application provides a battery protection detection circuit 100, including: a control processing module 101, a signal generation unit 102, a sampling resistor R, and a protection unit 103.

[0064] The first output terminal of the control processing module 101 is connected to the first terminal of the protection unit 103, the second output terminal of the control processing module 101 is connected to the first terminal of the sampling resistor R, the first input terminal of the control processing module 101 is connected to the second terminal of the sampling resistor R, and the second input terminal of the control processing module 101 is connected to the output terminal of the signal generating unit 102.

[0065] The second terminal of the protection unit 103 is connected to the input terminal of the signal generating unit 102, and the third and fourth terminals of the protection unit 103 are connected to the first and second terminals of the sampling resistor R, respectively.

[0066] The control processing module 101 is used to output a first voltage to the protection unit 103, output a second voltage to the sampling resistor R, stop outputting the first and second voltages under the action of the target level signal output by the signal generation unit 102, collect the sampling voltage of the sampling resistor R, and record the protection time.

[0067] The protection unit 103 is used to acquire the sampled voltage and to shut it off when the sampled voltage is greater than a preset threshold.

[0068] The signal generating unit 102 is used to output the target level signal to the control processing module when the protection unit 103 is turned off.

[0069] Understandably, the first terminal of the protection unit 103 is also used to connect to the positive terminal of the battery under test, that is, the first terminal of the protection unit 103 can serve as the positive input terminal B+ of the battery protection board. The second terminal of the protection unit 103 is also used to connect to the positive terminal of the electrical load, that is, the second terminal of the protection unit 103 can serve as the positive output terminal P+ of the battery protection board. The first terminal of the sampling resistor R is also used to connect to the negative terminal of the battery under test, that is, the first terminal of the sampling resistor R can serve as the negative input terminal B- of the battery protection board. The second terminal of the sampling resistor R is also used to connect to the negative terminal of the electrical load, that is, the second terminal of the sampling resistor R can serve as the negative output terminal P- of the battery protection board.

[0070] The battery under test can be any possible battery or battery pack, and the battery under test may include one or more cells. This application embodiment does not limit this.

[0071] Optionally, both the first voltage and the second voltage can be analog signals. Generally, the first voltage is a positive voltage and the second voltage is a negative voltage. The voltage levels of the first voltage and the second voltage can be the same to achieve symmetrical testing.

[0072] The first voltage can specifically be the voltage used to simulate the voltage input to the positive input terminal B+ of the battery under test during the test, and the second voltage can specifically be the voltage used to simulate the voltage input to the negative input terminal B- of the battery under test during the test.

[0073] Optionally, the sampling voltage may be the voltage generated across the sampling resistor based on the second voltage, or it may refer to the voltage across the sampling resistor collected by the protection unit 103.

[0074] Optionally, the preset threshold can be set by relevant technical personnel according to actual needs, and the preset threshold can specifically indicate the voltage at which the battery under test needs to be protected.

[0075] For example, if the sampled voltage is greater than the preset threshold, it indicates that the battery under test needs to be protected, that is, the protection unit 103 needs to be turned off. If the sampled voltage is less than or equal to the preset threshold, it indicates that the battery under test does not need to be protected, that is, the protection unit 103 can remain on.

[0076] Furthermore, when the protection unit 103 is turned off, the first voltage cannot be output to the second terminal of the protection unit 103 through the protection unit 103.

[0077] In other words, when the protection unit 103 is turned on, the first voltage can be output to the signal generation unit 102 through the protection unit 103. When the protection unit 103 is turned off, the first voltage cannot be output to the signal generation unit 102 through the protection unit 103.

[0078] Optionally, the signal generating unit 102 can be a trigger. For example, the signal generating unit 102 can output a default signal or not output a signal to the control processing module 101 when the first voltage input is present; however, when the first voltage input is absent, the signal generating unit 102 outputs the target level signal to the control processing module 101.

[0079] Furthermore, if the signal generating unit 102 outputs the default signal when the first voltage input is present, then the target level signal can be a signal obtained by inverting the default signal. That is, the potential of the target level signal and the default signal can be opposite. This application embodiment does not limit this.

[0080] Optionally, the protection time can refer to the duration from the moment when the circuit 100 begins to perform the protection action to the moment when the circuit 100 completes the protection action or collects the required data.

[0081] In this embodiment, the control processing module 101 can generally output the first voltage to the protection unit 103 first, and then output the second voltage to the sampling resistor R. However, in some special cases, the second voltage can be output to the sampling resistor R first, and then the first voltage can be output to the protection unit 103. The specific settings can be configured according to actual needs, and this embodiment does not limit this.

[0082] Optionally, after the control processing module 101 acquires the sampling voltage, it can also perform calculations based on the sampling voltage and the resistance value of the sampling resistor R to obtain the sampling current flowing through the sampling resistor R. This embodiment of the application does not limit this.

[0083] Generally, the sampling voltage, sampling current, and / or protection time collected by the control processing module 101 can be used as the final test results obtained by the circuit 100. This application embodiment does not limit this.

[0084] Furthermore, the control processing module 101 can actively output the first voltage and the second voltage when certain conditions are met, or it can output the first voltage and the second voltage only after receiving a test start command from other devices or equipment. This application embodiment does not limit this aspect.

[0085] It is worth noting that if the signal generating unit 102 outputs the target level signal to the control processing module 101, it indicates that the first voltage is not currently input to the signal generating unit 102 and the protection unit 102 is turned off. That is, the battery under test has already implemented corresponding protection measures, preventing the voltage output by the battery under test or the first voltage from being output to the electrical load. Therefore, when the control processing module 101 receives the target level signal, it can determine that the test is complete and stop outputting the first voltage and the second voltage.

[0086] It should be noted that, in order to better explain the circuit 100 provided in the embodiments of this application, the specific working principle of the circuit 100 is described below:

[0087] In the initial or default state, i.e., when the control processing module 101 does not output the first voltage and the second voltage, there is no voltage across the sampling resistor R and no current flows through the sampling resistor R. The sampling resistor value acquired by the protection unit 103 should be 0V, therefore the protection unit 103 does not activate. Although the signal generation unit 102 also has no voltage input, since the control processing module 101 does not output the first voltage, i.e., it is not currently in a test state, the control processing module 101 also does not activate.

[0088] When the control processing module 101 outputs the first voltage to the protection unit 103 and then outputs the second voltage to the sampling resistor R, since the first voltage is input first, the protection unit 102 has not yet acquired the sampling voltage. Therefore, the protection unit 102 remains in the conducting state, and the first voltage can be output to the signal generation unit 102 through the protection unit 102. Thus, the signal generation unit 102 outputs a default signal or does not output a signal, and the control processing module 101 can determine that the test process has been entered.

[0089] When the second voltage is output to the sampling resistor R, current begins to flow through the sampling resistor R, and both the protection unit 103 and the control processing module 101 can acquire the sampled voltage. If the sampled voltage is less than or equal to the preset threshold, the protection unit 103 will remain on, and the signal generation unit 102 will not output the target level signal. In this case, the control processing module 101 can actively stop outputting the first voltage and the second voltage after a period of time to restore the default state.

[0090] If the sampled voltage exceeds the preset threshold, the protection unit 103 shuts off. At this time, the first voltage cannot be output to the signal generation unit 102 through the protection unit 102. Therefore, the signal generation unit 102 starts outputting the target level signal. Upon receiving the target level signal, the control processing module 101 determines that the protection unit 102 has performed a protection action, and thus stops outputting the first and second voltages. Furthermore, the control processing module 101 can record the protection time by using the start time of the second voltage output as the start time and the end time of receiving the target level signal or stopping the second voltage output. In this way, the battery protection test can be completed, and the corresponding test results can be obtained.

[0091] It is worth noting that, since the circuit 100 provided in this application embodiment can output the first voltage and the second voltage to the positive and negative terminals of the battery protection board, and can realize the synchronous output or synchronous stop of the first voltage and the second voltage, it is possible to perform symmetrical testing of the positive and negative terminals of the battery with the same current.

[0092] In this embodiment, a control processing module 101, a signal generating unit 102, a sampling resistor R, and a protection unit 103 are configured. The first output terminal of the control processing module 101 is connected to the first terminal of the protection unit 103; the second output terminal of the control processing module 101 is connected to the first terminal of the sampling resistor R; the first input terminal of the control processing module 101 is connected to the second terminal of the sampling resistor R; and the second input terminal of the control processing module 101 is connected to the output terminal of the signal generating unit 102. The second terminal of the protection unit 103 is connected to the input terminal of the signal generating unit 102; and the third and fourth terminals of the protection unit 103 are respectively connected to the first and second terminals of the sampling resistor R.

[0093] The control processing module 101 can output the first voltage and the second voltage to the positive and negative terminals of the battery protection board. Furthermore, the protection unit 103 can shut down to cut off the transmission path of the first voltage when it detects an excessively high sampling voltage. This causes the signal generation unit 102 to output the target level signal to the control processing module, thereby achieving synchronous output or synchronous cessation of the first and second voltages. This allows for symmetrical testing of the positive and negative terminals of the battery with equal current.

[0094] In addition, the circuit 100 provided in this application embodiment can also apply current only to the negative terminal of the battery to perform asymmetric testing of the negative terminal.

[0095] This reduces the limitations of battery protection detection circuits, thereby improving their flexibility.

[0096] In one possible implementation, see [link to relevant documentation]. Figure 2 The control processing module 101 includes: a control unit 1011, a first conversion unit 1012, and a second conversion unit 1013.

[0097] The first output terminal of the control unit 1011 is connected to the input terminal of the first conversion unit 1012, the second output terminal of the control unit 1011 is connected to the first input terminal of the second conversion unit 1013, the first input terminal of the control unit 1011 is connected to the first output terminal of the second conversion unit 1013, and the second input terminal of the control unit 1011 is connected to the output terminal of the signal generating unit 102.

[0098] The first output terminal of the first conversion unit 1012 is connected to the first terminal of the protection unit 103.

[0099] The second output terminal of the second conversion unit 1013 is connected to the first terminal of the sampling resistor R, and the second input terminal of the second conversion unit 1013 is connected to the second terminal of the sampling resistor R.

[0100] Optionally, the control unit 1011 can be any processing device with functions such as processing, control, calculation, and communication, such as a microcontroller unit (MCU) or a digital signal processor (DSP). This application embodiment does not limit this.

[0101] Specifically, the control unit 1011 is used to output a first digital voltage to the first conversion unit 1012, output a second digital voltage to the second conversion unit 1013, stop outputting the first digital voltage and the second digital voltage under the action of the target level signal, receive the sampled digital voltage output by the second conversion unit 1013, and record the protection time.

[0102] In one possible approach, the control unit 1011 may also calculate the sampling current value based on the resistance value of the sampling resistor R and the voltage level corresponding to the sampling digital voltage upon receiving the sampled digital voltage. This embodiment of the application does not limit this approach.

[0103] In this embodiment, the control unit 1011 may include at least one control subunit, and each control subunit may output corresponding digital signals such as the first digital voltage and / or the second digital voltage.

[0104] Optionally, the first conversion unit 1012 is used to convert the first digital voltage into the first voltage. The first digital voltage may be a digital signal corresponding to the first voltage.

[0105] Optionally, the second conversion unit 1013 is used to convert the second digital voltage into the second voltage and to convert the received sampled voltage into the sampled digital voltage.

[0106] The second digital voltage can be a digital signal corresponding to the second voltage, and the sampled digital voltage can be a digital signal corresponding to the sampled voltage.

[0107] It is worth noting that, under normal circumstances, the signals output by the control unit 1011 and the signals that can be correctly received and identified are digital signals, while the electrical signals flowing through the sampling resistor R and the protection unit 103 are generally analog signals. Therefore, it is necessary to convert the various signals in the circuit 100 through the first conversion unit 1012 and the second conversion unit 1013 to ensure that each device in the circuit 100 can work normally. In this way, the practicality and usability of the circuit 100 can be ensured.

[0108] In one possible implementation, see [link to relevant documentation]. Figure 3The second conversion unit 1013 includes: a first digital-to-analog converter DAC1 and a first analog-to-digital converter ADC1.

[0109] The input terminal of the first digital-to-analog converter DAC1 is connected to the first output terminal of the control unit 1011, and the output terminal of the first digital-to-analog converter DAC1 is connected to the first terminal of the sampling resistor R. The input terminal of the first analog-to-digital converter ADC1 is connected to the second terminal of the sampling resistor R, and the output terminal of the first analog-to-digital converter ADC1 is connected to the first input terminal of the control unit 1011.

[0110] Optionally, the first digital-to-analog converter DAC1 can be used to convert the second digital voltage into the second voltage.

[0111] Optionally, the first analog-to-digital converter ADC1 can be used to convert the sampled voltage into the sampled digital voltage.

[0112] It is worth noting that, since a digital-to-analog converter is a device that can convert digital signals into analog signals and an analog-to-digital converter is a device that can convert analog signals into digital signals, the first digital-to-analog converter DAC1 and the first analog-to-digital converter ADC1 can reliably and quickly convert the voltage signal corresponding to the negative terminal of the battery protection board into digital-to-analog or analog-to-digital signals to ensure that the circuit 100 can work normally.

[0113] In one possible implementation, see [link to previous section] Figure 3 The first conversion unit 1012 includes a second digital-to-analog converter DAC2.

[0114] The input terminal of the second digital-to-analog converter DAC2 is connected to the second output terminal of the control unit 1011, and the output terminal of the second digital-to-analog converter DAC2 is connected to the first terminal of the protection unit 103.

[0115] Optionally, a second digital-to-analog converter DAC2 is used to convert the first digital voltage into the first voltage.

[0116] It is worth noting that, since a digital-to-analog converter is a device that can convert digital signals into analog signals, the second digital-to-analog converter DAC2 can reliably and quickly convert the first digital voltage output by the control unit 1011 into the first voltage, so as to ensure that the protection unit 103 can be turned on or off normally, and that the signal generation unit 102 can operate correctly to output the target level signal or the default signal to the control unit 1011.

[0117] In one possible implementation, see [link to relevant documentation]. Figure 4 The first conversion unit 1012 also includes a second analog-to-digital converter ADC2.

[0118] The input terminal of the second analog-to-digital converter ADC2 is connected to the second terminal of the protection unit 103 and the input terminal of the signal generation unit 102, respectively, and the output terminal of the second analog-to-digital converter ADC2 is connected to the third input terminal of the control unit 1011.

[0119] Optionally, the second analog-to-digital converter ADC2 is used to receive the detection voltage input from the protection unit 103 and convert the detection voltage into a digital signal and output it to the control unit 1011.

[0120] The control unit 1011 is also used to determine whether the voltage of the digital signal meets the preset voltage.

[0121] Optionally, the detection voltage may refer to the voltage output from the protection unit 103 to the second analog-to-digital converter ADC2 and the signal generation unit 102. That is, the detection voltage is generated based on the first voltage.

[0122] Optionally, the digital signal can be used to indicate the voltage level of the detected voltage. The preset voltage can be set by a skilled technician according to actual needs, and this embodiment does not limit this setting.

[0123] Under normal circumstances, if the voltage of the digital signal meets the preset voltage, it indicates that the detection voltage is in a normal state, and that the first voltage output by the control unit 1011 meets the test requirements. Conversely, if the voltage of the digital signal does not meet the preset voltage, it indicates that the detection voltage is in an abnormal state, and that the first voltage output by the control unit 1011 does not meet the test requirements, the circuit at the positive terminal of the battery protection board is faulty, or the protection unit 103 is not conducting properly.

[0124] It is worth noting that if the control unit 1011 determines that the voltage of the digital signal meets the preset voltage, it can be determined that the first voltage output by the control unit 1011 is normal, and that the battery protection board and the protection unit 103 are normal. At this time, the control unit 1011 can execute the subsequent test process normally.

[0125] If the control unit 1011 determines that the voltage of the digital signal does not meet the preset voltage, it can determine that the first voltage output by the control unit 1011 is abnormal, or that the battery protection board or the protection unit 103 is faulty. In this case, even if the subsequent test process is continued, accurate test results may not be obtained. Therefore, the control unit 1011 can stop outputting the first voltage and the second voltage.

[0126] In addition, the control unit 1011 can also output prompt signals to other external devices or apparatuses that are capable of communication, so as to remind relevant technical personnel to handle the matter.

[0127] This improves the practicality of circuit 100 and the reliability of measurement results.

[0128] In one possible implementation, see [link to relevant documentation]. Figure 5 The control unit 1011 includes: a first control subunit M1 and a second control subunit M2.

[0129] The output terminal of the first control subunit M1 is connected to the input terminal of the first conversion unit 1012, the first input terminal of the first control subunit M1 is connected to the output terminal of the signal generating unit, and the control terminal of the first control subunit M1 is connected to the control terminal of the second control subunit M2.

[0130] The output terminal of the second control subunit M2 is connected to the first input terminal of the second conversion unit 1013, the first input terminal of the second control subunit M2 is connected to the output terminal of the signal generating unit, and the second input terminal of the second control subunit M2 is connected to the first output terminal of the second conversion unit 1013. Optionally, the first control subunit M1 is used to output the first digital voltage.

[0131] Optionally, the second control subunit M2 is used to output the second digital voltage, receive the sampled digital voltage, stop outputting the second digital voltage under the action of the target level signal and control the first control subunit M1 to stop outputting the first digital voltage, and record the protection time.

[0132] In this embodiment, the first control subunit M1 and the second control subunit M2 can be MCU or DSP, and this application embodiment does not limit this.

[0133] Alternatively, the first control subunit M1 can output the first digital voltage first, and then the second control subunit M2 can output the second digital voltage.

[0134] For example, when the second control subunit M2 controls the first control subunit M1 to stop outputting the first digital voltage, the second control subunit M2 can generally send a corresponding stop signal to the first control subunit M1. After receiving the stop signal, the first control subunit M1 can stop outputting the first digital voltage.

[0135] Understandably, the first control subunit M1 can act as a slave, and the second control subunit M2 can act as a master. By outputting corresponding digital signals from the two control subunits, the first and second voltages are respectively supplied to the protection unit 103 and the sampling resistor R, thereby enabling symmetrical testing of the positive and negative terminals of the battery with equal current. This reduces the computational burden and processing logic complexity of a single control subunit, and also avoids the pin shortage problem that would arise from using a single control subunit as the control unit 1011.

[0136] In one possible implementation, see [link to relevant documentation]. Figure 6 The control unit 1011 also includes a signal isolator U.

[0137] The first end of the signal isolator U is connected to the output end of the signal generating unit 102. The second and third ends of the signal isolator U are connected to the first input end of the first control subunit M1 and the first input end of the second control subunit M2, respectively. The fourth and fifth ends of the signal isolator U are connected to the control end of the first control subunit M1 and the control end of the second control subunit M2, respectively.

[0138] Optionally, the signal isolator U is used at least to forward the target level signal to the first control subunit M1 and the second control subunit M2.

[0139] Optionally, the signal isolator U can also be used to transmit communication signals between the first control subunit M1 and the second control subunit M2.

[0140] For example, when the second control subunit M2 needs to control the first control subunit M1 to stop outputting the first digital voltage, the second control subunit M2 can first send the stop signal to the signal isolator U, and then the signal isolator U can forward the stop signal to the first control subunit M1.

[0141] It is worth noting that this allows for digital level isolation via the signal isolator U, preventing signal interference and level pulses between the two control subunits. It also prevents interference between the signal generation unit 102 and the two control subunits, thus avoiding situations that could affect the normal operation of circuit 100. This improves the stability and reliability of circuit 100.

[0142] In one possible implementation, see [link to relevant documentation]. Figure 7 The protection unit 102 includes: a protection processor M3 and a switching transistor Q.

[0143] The first and second acquisition terminals of the protection processor M3 are connected to the first and second terminals of the sampling resistor R, respectively, and the control terminal of the protection processor M3 is connected to the gate of the switching transistor Q.

[0144] The protection processor M3 is used to acquire the sampled voltage and output a control signal to the switch Q when the sampled voltage is greater than a preset threshold.

[0145] The source of the switching transistor Q is connected to the input terminal of the signal generation unit 102 and the positive terminal of the electrical load, respectively, and the drain of the switching transistor Q is used to connect to the positive terminal of the battery under test.

[0146] Optionally, the protection processor M3 can be any integrated circuit (IC) used for battery protection. Simply put, the protection processor M3 controls the switch Q to turn off when the sampled voltage is too high, thereby cutting off the path between the positive terminal of the battery under test and the positive terminal of the electrical load, and / or cutting off the path of the first voltage transmitted to the signal generation unit 102.

[0147] Optionally, the control signal can be an analog signal, specifically used to turn off the switching transistor Q.

[0148] Optionally, the switching transistor Q can be an N-channel metal-oxide-semiconductor field-effect transistor (NMOS transistor). This application does not limit this.

[0149] In this way, the sampling voltage of the sampling resistor R can be detected by the protection processor M3, and the switching transistor Q can be turned off, thereby cutting off the circuit to achieve the purpose of battery protection.

[0150] The following describes a battery testing system that belongs to the same concept as the battery testing system provided in this application. The specific implementation process and technical effects are described above, and will not be repeated in detail below.

[0151] Figure 8 This is a schematic diagram of the structure of a battery detection system provided in an embodiment of this application. See also... Figure 8 The battery detection system includes an electronic device E and a battery protection detection circuit 100 provided in any of the above embodiments.

[0152] Optionally, the electronic device E can serve as the host computer of the battery protection detection circuit 100. The electronic device E can be used to send corresponding start commands to the control processing module 101, control unit 1011, first control subunit M1 and / or second control subunit M2 in the battery protection detection circuit 100, so that the control processing module 101, control unit 1011, first control subunit M1 and / or second control subunit M2 output the aforementioned first voltage and / or second voltage.

[0153] In addition, the battery protection detection circuit 100 can send the final test results, such as protection time, sampling voltage, and sampling current value, to the electronic device E. This application embodiment does not limit this aspect.

[0154] Optionally, the electronic device E can be any possible device such as a computer, tablet computer, laptop computer, server, or smartphone, and this application embodiment does not limit this.

[0155] Optionally, the battery detection system further includes at least one serial communication device C.

[0156] Each serial communication device C is connected between the electronic device E and the battery protection detection circuit 100.

[0157] Optionally, the serial communication device C can be any possible serial communication level conversion chip, specifically used to convert the digital signal output by the control processing module 101 in the battery protection detection circuit 100 into a form that the host computer can recognize. For example, if the first control subunit M1 and the second control subunit M2 are MCUs and the electronic device E is a computer, the serial communication device C can be a single-supply level conversion chip capable of converting the MCU's TTL level signal into a 232 level signal, specifically a MAX232 chip. This application does not limit this aspect.

[0158] For example, see [link to previous article] Figure 8 The battery detection system includes two serial communication devices C, and the battery protection detection circuit 100 includes a first control subunit M1 and a second control subunit M2. These two serial communication devices C can be connected between the first control subunit M1 and the electronic device E, and between the second control subunit M2 and the electronic device E, respectively.

[0159] The battery detection system described above includes the battery protection detection circuit provided in the aforementioned embodiments. Its implementation principle and technical effects are similar, and will not be described again here.

[0160] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0161] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery protection detection circuit, characterized by, The battery protection detection circuit comprises a control processing module, a signal generating unit, a sampling resistor and a protection unit. A first output end of the control processing module is connected with a first end of the protection unit, a second output end of the control processing module is connected with a first end of the sampling resistor, a first input end of the control processing module is connected with a second end of the sampling resistor, and a second input end of the control processing module is connected with an output end of the signal generating unit; the control processing module is used for outputting a first voltage to the protection unit, outputting a second voltage to the sampling resistor, stopping outputting the first voltage and the second voltage under the action of a target level signal output by the signal generating unit, collecting a sampling voltage of the sampling resistor, and recording a protection time; A second end of the protection unit is connected with an input end of the signal generating unit, and a third end and a fourth end of the protection unit are respectively connected with the first end and the second end of the sampling resistor; the protection unit is used for collecting the sampling voltage and being turned off when the sampling voltage is greater than a preset threshold; and the signal generating unit is used for outputting the target level signal to the control processing module when the protection unit is turned off.

2. The battery protection detection circuit of claim 1, wherein, The control processing module comprises a control unit, a first conversion unit and a second conversion unit. A first output end of the control unit is connected with an input end of the first conversion unit, a second output end of the control unit is connected with a first input end of the second conversion unit, a first input end of the control unit is connected with a first output end of the second conversion unit, and a second input end of the control unit is connected with an output end of the signal generating unit; the control unit is used for outputting a first digital voltage to the first conversion unit, outputting a second digital voltage to the second conversion unit, stopping outputting the first digital voltage and the second digital voltage under the action of the target level signal, receiving a sampling digital voltage output by the second conversion unit, and recording the protection time; A first output end of the first conversion unit is connected with a first end of the protection unit; the first conversion unit is used for converting the first digital voltage into the first voltage; A second output end of the second conversion unit is connected with a first end of the sampling resistor, and a second input end of the second conversion unit is connected with a second end of the sampling resistor; the second conversion unit is used for converting the second digital voltage into the second voltage and converting the received sampling voltage into the sampling digital voltage.

3. The battery protection detection circuit of claim 2, wherein, The second conversion unit comprises a first digital-to-analog converter and a first analog-to-digital converter. An input end of the first digital-to-analog converter is connected with a first output end of the control unit, and an output end of the first digital-to-analog converter is connected with a first end of the sampling resistor; the first digital-to-analog converter is used for converting the second digital voltage into the second voltage; An input end of the first analog-to-digital converter is connected with a second output end of the second conversion unit, and an output end of the first analog-to-digital converter is connected with a second end of the sampling resistor; the first analog-to-digital converter is used for converting the sampling voltage into the sampling digital voltage. The input end of the first analog-digital converter is connected with the second end of the sampling resistor, and the output end of the first analog-digital converter is connected with the first input end of the control unit; the first analog-digital converter is used for converting the sampling voltage into the sampling digital voltage.

4. The battery protection detection circuit of claim 2, wherein, The first conversion unit comprises a second digital-analog converter; The input end of the second digital-analog converter is connected with the second output end of the control unit, and the output end of the second digital-analog converter is connected with the first end of the protection unit; The second digital-analog converter is used for converting the first digital voltage into the first voltage.

5. The battery protection detection circuit of claim 4, wherein, The first conversion unit further comprises a second analog-digital converter; The input end of the second analog-digital converter is connected with the second end of the protection unit and the input end of the signal generating unit respectively, and the output end of the second analog-digital converter is connected with the third input end of the control unit; the second analog-digital converter is used for receiving the detection voltage input from the protection unit and converting the detection voltage into a digital signal and outputting the digital signal to the control unit; The control unit is further used for determining whether the voltage of the digital signal meets a preset voltage.

6. The battery protection detection circuit of claim 2, wherein, The control unit comprises a first control sub-unit and a second control sub-unit; The output end of the first control sub-unit is connected with the input end of the first conversion unit, the first input end of the first control sub-unit is connected with the output end of the signal generating unit, and the control end of the first control sub-unit is connected with the control end of the second control sub-unit; the first control sub-unit is used for outputting the first digital voltage; The output end of the second control sub-unit is connected with the first input end of the second conversion unit, the first input end of the second control sub-unit is connected with the output end of the signal generating unit, and the second input end of the second control sub-unit is connected with the first output end of the second conversion unit; The second control sub-unit is used for outputting the second digital voltage, receiving the sampling digital voltage, stopping outputting the second digital voltage under the action of the target level signal, controlling the first control sub-unit to stop outputting the first digital voltage, and recording the protection time.

7. The battery protection detection circuit of claim 6, wherein, The control unit further comprises a signal isolator; The first end of the signal isolator is connected with the output end of the signal generating unit, the second end and the third end of the signal isolator are connected with the first input end of the first control sub-unit and the first input end of the second control sub-unit respectively, and the fourth end and the fifth end of the signal isolator are connected with the control end of the first control sub-unit and the control end of the second control sub-unit respectively; The signal isolator is used for at least forwarding the target level signal to the first control sub-unit and the second control sub-unit.

8. The battery protection detection circuit of claim 1, wherein, The protection unit comprises a protection processor and a switch tube; The first and second collecting ends of the protection processor are connected with the first and second ends of the sampling resistor respectively, and the control end of the protection processor is connected with the gate of the switch tube; the protection processor is used for collecting the sampling voltage and outputting a control signal to the switch tube when the sampling voltage is greater than a preset threshold value; The source of the switch tube is connected with the input end of the signal generating unit and the anode of the power load respectively, and the drain of the switch tube is used for connecting the anode of the battery to be tested.

9. A battery detection system, characterized by, The battery detection system comprises an electronic device and the battery protection detection circuit according to any one of claims 1 to 8.

10. The battery detection system of claim 9, wherein, The battery detection system further comprises at least one serial communication device. Each serial communication device is connected between the electronic device and the battery protection detection circuit respectively.

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