Circuit and device for detecting service life of battery and electronic equipment

Abstract

The utility model relates to a battery life detection circuit, a battery life detection device and electronic equipment. The circuit comprises a first resistor module, a second resistor module, a third resistor module, a switch module and a controller. The controller is used for controlling the switch module to be switched on, so that a voltage division loop is formed among the to-be-detected battery, the first resistor module, the second resistor module, the third resistor module and the common ground, and the to-be-detected battery is detected by collecting an anode voltage signal between the anode of the to-be-detected battery and the common ground and a cathode voltage signal between the cathode of the to-be-detected battery and the common ground. And outputting a service life detection result of the to-be-detected battery. According to the invention, the test precision of the voltage difference between the positive electrode and the negative electrode of the to-be-tested battery can be improved through a simple circuit structure, and the safety condition of the to-be-tested battery can be judged.

Description

Technical Field

[0001] The present application relates to the technical field of battery safety detection, and particularly to a battery life detection circuit, device, and electronic device. Background Art

[0002] With the wide application of battery technology, the safety issue of battery systems has become increasingly important. If a battery system with potential safety hazards cannot be detected and replaced in time, it will pose a significant risk to the device.

[0003] The life of a battery is an important indicator for evaluating whether the battery is in a safe state. Traditional battery life detection circuits are often complex in structure and high in cost, making it difficult to meet the requirements of modern battery systems for high precision and low cost. Summary of the Utility Model

[0004] Based on this, it is necessary to provide a battery life detection circuit with a simple structure that can accurately measure the voltage difference between the positive and negative electrodes of the battery and the ground wire, achieve high-precision, low-cost, safe, and reliable battery insulation detection, and thus obtain the battery life detection result.

[0005] In a first aspect, a battery life detection circuit is provided. The circuit includes a first resistor module R1, a second resistor module R2, a third resistor module R3, a switch module, and a controller.

[0006] The first end of the first resistor module R1 is used to connect to the positive electrode of the battery under test, the second end of the first resistor module R1 is connected to the first end of the second resistor module R2, and the second end of the second resistor module R2 is used to connect to the negative electrode of the battery under test; the first end of the third resistor module R3 is connected to the second end of the first resistor module R1, and the second end of the third resistor module R3 is connected to the common ground; the switch module is connected between the first resistor module R1, the second resistor module R2, the third resistor module R3, and the battery under test.

[0007] The controller, connected to the switch module, is used to control the switch module to close, so as to form a voltage division loop between the battery under test, the first resistor module R1, the second resistor module R2, the third resistor module R3, and the common ground.

[0008] The first input terminal of the controller is connected to the first end of the second resistor module R2, and the second input terminal is connected to the second end of the second resistor module R2. It is used to collect the positive voltage signal between the positive electrode of the battery under test and the common ground and the negative voltage signal between the negative electrode of the battery under test and the common ground based on the voltage division loop; and output the battery life detection result of the battery under test according to the positive voltage signal and the negative voltage signal.

[0009] In one embodiment, the controller includes a voltage difference calculation module, a first storage module, and a first judgment module. The first judgment module is connected to the voltage difference calculation module and the first storage module.

[0010] The voltage difference calculation module has its first input terminal connected to the first end of the second resistor module R2 and its second input terminal connected to the second end of the second resistor module R2. It is used to calculate the positive and negative voltage difference of the battery under test according to the positive voltage signal and the negative voltage signal.

[0011] The first storage module is used to store the standard voltage difference parameter.

[0012] The first judgment module is used to compare the positive and negative voltage difference with the standard voltage difference parameter and output the life detection result of the battery under test.

[0013] In one embodiment, the controller includes an impedance calculation module, a second storage module, and a second judgment module. The second judgment module is connected to the impedance calculation module and the second storage module.

[0014] The impedance calculation module is used to calculate the positive insulation impedance between the positive electrode of the battery under test and the common ground and the negative insulation impedance between the negative electrode of the battery under test and the common ground according to the positive voltage signal and the negative voltage signal.

[0015] The second storage module is used to store the standard insulation impedance parameter.

[0016] The second judgment module is used to compare the positive insulation impedance and the negative insulation impedance with the standard insulation impedance parameter to obtain a second comparison result, and output the life detection result of the battery under test according to the second comparison result.

[0017] In one embodiment, the impedance calculation module includes:

[0018] A differential detection circuit, whose first input terminal is connected to the first end of the second resistor module R2 and whose second input terminal is connected to the second end of the second resistor module R2. It is used to perform differential amplification and level conversion on the collected positive voltage signal and negative voltage signal and output a single common-ground voltage signal.

[0019] An AD conversion circuit, connected to the differential detection circuit, is used to perform digital conversion on the common-ground voltage signal and output a positive and negative differential signal.

[0020] A calculation module, connected to the AD conversion circuit, is configured to calculate the insulation impedance between the positive electrode of the battery under test and the positive electrode of the common ground, and the insulation impedance between the negative electrode of the battery under test and the negative electrode of the common ground according to the positive and negative differential signals.

[0021] In one embodiment, the switch module includes at least one switch S1.

[0022] One end of the switch S1 is connected to the positive electrode of the battery under test, and the other end is connected to the first end of the first resistor module R1; or, one end of the switch S1 is connected to the negative electrode of the battery under test, and the other end is connected to the second end of the second resistor module R2.

[0023] The switch S1 is configured to close or open after receiving the switch switching signal generated by the controller, so as to form a voltage division loop between the battery under test, the first resistor module R1, the second resistor module R2, the third resistor module R3 and the common ground.

[0024] In one embodiment, the switch module includes at least one switch S2 and at least one switch S3. One end of the switch S2 is connected to the second end of the first resistor module R1, and the other end is connected to the first end of the second resistor module R2; one end of the switch S3 is connected to the second end of the first resistor module R1, and the other end is connected to the first end of the third resistor module R3.

[0025] The switches S2 and S3 are configured to close after receiving the switch switching signal generated by the controller, so as to form a voltage division loop between the battery under test, the first resistor module R1, the second resistor module R2, the third resistor module R3 and the common ground.

[0026] In one embodiment, the switch module includes a transistor Q1 and a relay SW1. The transistor Q1 is connected to the controller, and the relay SW1 is connected to the emitter of the transistor Q1.

[0027] The switch module is configured to receive the switch switching signal generated by the controller, control the conduction of the transistor Q1 to control the attraction of the relay SW1, so as to form a voltage division loop between the battery under test, the first resistor module R1, the second resistor module R2, the third resistor module R3 and the common ground.

[0028] In one embodiment, the resistance values of the first resistor module R1 and the second resistor module R2 are equal.

[0029] In a second aspect, a battery life detection device is provided, including the battery life detection circuit described in the first aspect above.

[0030] In a third aspect, an electronic device is provided, including the battery life detection device as described in the second aspect and an alarm device. The alarm device is connected to the battery life detection device and is configured to give a response alarm according to the life detection result output by the battery life detection device.

[0031] For the above-mentioned battery life detection circuit, device and electronic device, a resistor voltage division network is formed by the first resistor module R1, the second resistor module R2, and the third resistor module R3. By controlling the closing of the switch module through the controller, a voltage division loop is formed between the battery under test, the first resistor module R1, the second resistor module R2, the third resistor module R3 and the common ground, and the positive voltage signal between the positive electrode of the battery under test and the common ground and the negative voltage signal between the negative electrode of the battery under test and the common ground are measured. The circuit structure is simple, the safety condition of the battery under test can be judged, and the battery life detection result can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 It is the battery life detection circuit of an embodiment;

[0034] Figure 2 It is a structure of the controller in an embodiment;

[0035] Figure 3 It is another structure of the controller in an embodiment;

[0036] Figure 4 It is a structure of the impedance calculation module in an embodiment;

[0037] Figure 5 It is the differential detection circuit in an embodiment;

[0038] Figure 6 It is a structure of the switch module in an embodiment;

[0039] Figure 7 It is another structure of the switch module in an embodiment;

[0040] Figure 8 It is yet another structure of the switch module in an embodiment;

[0041] Figure 9 It is still another structure of the switch module in an embodiment. Detailed implementation manners

[0042] For ease of understanding of the present application, the present application will be described more comprehensively below with reference to the relevant accompanying drawings. Embodiments of the present application are shown in the accompanying drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0044] It can be understood that the terms "first", "second", etc. used in this application can be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor can be referred to as a second resistor, and similarly, a second resistor can be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0045] It can be understood that in the following embodiments, "connection", if there is an electrical signal or data transfer between the connected circuits, modules, units, etc., should be understood as "electrical connection", "communication connection", etc.

[0046] It can be understood that "at least one" means one or more, and "a plurality" means two or more. "At least part of an element" means part or all of the element.

[0047] As used herein, the singular forms "a", "an", and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprise / include" or "have" etc. specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the related listed items.

[0048] As Figure 1 shown, the life detection circuit of the battery includes a first resistor module R1, a second resistor module R2, a third resistor module R3, a switch module, and a controller. Among them, the resistance values of the first resistor module R1 and the second resistor module R2 are equal.

[0049] The first end of the first resistor module R1 is used to connect to the positive electrode Bat+ of the battery under test, the second end of the first resistor module R1 is connected to the first end of the second resistor module R2, and the second end of the second resistor module R2 is used to connect to the negative electrode Bat- of the battery under test; the first end of the third resistor module R3 is connected to the second end of the first resistor module R1, and the second end of the third resistor module R3 is connected to the common ground PE; the switch module is connected between the first resistor module R1, the second resistor module R2, the third resistor module R3 and the battery under test.

[0050] The controller, connected to the switch module, is used to control the switch module to close, so as to form a voltage division loop between the battery under test, the first resistor module R1, the second resistor module R2, the third resistor module R3 and the common ground PE.

[0051] The first input end of the controller is connected to the first end of the second resistor module R2, and the second input end is connected to the second end of the second resistor module R2, and is used to collect the positive voltage signal V between the positive electrode of the battery under test and the common ground according to the voltage division loop. PE-TEXT and the negative voltage signal V between the negative electrode of the battery under test and the common ground. Bat-TEXT According to the positive voltage signal V PE-TEXT and the negative voltage signal V Bat-TEXT , output the life detection result of the battery under test.

[0052] In this embodiment, a resistor voltage division network is formed by the first resistor module R1, the second resistor module R2, and the third resistor module R3. The controller controls the closing of the switch module so as to form a voltage division loop between the battery under test, the first resistor module R1, the second resistor module R2, the third resistor module R3 and the common ground, and measures the positive voltage signal between the positive electrode of the battery under test and the common ground and the negative voltage signal between the negative electrode of the battery under test and the common ground, thereby realizing the judgment of the safety status of the battery under test and obtaining the life detection result of the battery.

[0053] In one embodiment, as Figure 2 shown, the controller includes a voltage difference calculation module 11, a first storage module 12, and a first judgment module 13 connected to the voltage difference calculation module 11 and the first storage module 12.

[0054] The voltage difference calculation module 11, its first input end is connected to the first end of the second resistor module R2, and the second input end is connected to the second end of the second resistor module R2, and is used to calculate the positive and negative voltage difference V of the battery under test according to the positive voltage signal V PE-TEXT and the negative voltage signal V Bat-TEXT of the battery under test.diff 。

[0055] The first storage module 12 is configured to store standard voltage difference parameters.

[0056] The first judgment module 13 is configured to compare the positive and negative voltage difference V diff with the standard voltage difference parameter to obtain a first comparison result, and output a life detection result of the battery under test according to the first comparison result.

[0057] Specifically, the standard voltage difference parameter is an interval parameter. If the first comparison result of the first judgment module shows that the positive and negative voltage difference V diff is greater than the interval range of the standard voltage difference parameter, it indicates that the insulation performance between the positive and negative electrodes of the battery under test has deteriorated, there are potential safety hazards of leakage or poor insulation, and the life of the battery under test has expired. Otherwise, the battery under test is within the safe use range.

[0058] In this embodiment, by comparing and judging the positive and negative voltage difference of the battery under test with the standard voltage difference parameter, accurate measurement of the voltage difference between the positive and negative electrodes of the battery is achieved, and the reliability of battery life safety detection is improved.

[0059] In one embodiment, as Figure 3 shown, the controller includes an impedance calculation module 21, a second storage module 22, and a second judgment module 23. The second judgment module 23 is connected to the impedance calculation module 21 and the second storage module 22.

[0060] The impedance calculation module 21 has its first input terminal connected to the first end of the second resistor module R2, and its second input terminal connected to the second end of the second resistor module R2. It is configured to calculate the positive insulation impedance R PE-TEXT between the positive electrode of the battery under test and the positive electrode of the common ground, and the negative insulation impedance R Bat-TEXT between the negative electrode of the battery under test and the negative electrode of the common ground according to the positive voltage signal V Bat+ and the negative voltage signal V Bat- .

[0061] The second storage module 22 is configured to store standard insulation impedance parameters.

[0062] The second judgment module 23 is configured to compare the positive insulation impedance R Bat+ and the negative insulation impedance R Bat- with the standard insulation impedance parameter to obtain a second comparison result, and output a life detection result of the battery under test according to the second comparison result.

[0063] Specifically, the standard insulation impedance parameter is an interval parameter. Through the impedance calculation module, the positive voltage signal V PE-TEXT and the negative voltage signal V Bat-TEXT are processed, and the positive insulation impedance R Bat+ between the positive electrode of the battery under test and the positive electrode of the common ground PE and the negative insulation impedance R Bat- between the negative electrode and the negative electrode of the common ground PE are calculated. If the second comparison result of the second judgment module shows that the positive insulation impedance R Bat+ or the negative insulation impedance R Bat- is greater than or less than the interval of the standard insulation impedance parameter, it indicates that there is a potential safety hazard of battery leakage or poor insulation. Otherwise, the insulation impedance of the battery under test is within the safe range, and the battery under test can be used safely.

[0064] In this embodiment, through the positive voltage signal V PE-TEXT and the negative voltage signal V Bat-TEXT , the positive insulation impedance R Bat+ between the positive electrode of the battery under test and the positive electrode of the common ground and the negative insulation impedance R Bat- between the negative electrode and the negative electrode of the common ground are calculated, realizing the accurate detection of the insulation impedance between the positive and negative electrodes of the battery, improving the detection accuracy of battery leakage safety, and realizing the life detection of the battery.

[0065] In one of the embodiments, as Figure 4 shown, the impedance calculation module 21 includes:

[0066] A differential detection circuit 211, whose first input terminal is connected to the first end of the second resistor module R2, and whose second input terminal is connected to the second end of the second resistor module R2, is used for differentially amplifying and level converting the collected positive voltage signal V PE-TEXT and the negative voltage signal V Bat-TEXT , and outputting a single common-ground voltage signal V PE-TEXT-IN .

[0067] An AD conversion circuit 212, connected to the differential detection circuit, is used for digitally converting the common-ground voltage signal V PE-TEXT-IN and outputting a positive and negative differential signal V PE-TEXT-IN-ADC .

[0068] A calculation module 213, connected to the AD conversion circuit 212, is used for calculating the positive insulation impedance R PE-TEXT-IN-ADC between the positive electrode of the battery under test and the positive electrode of the common ground and the negative insulation impedance R Bat+ between the negative electrode of the battery under test and the negative electrode of the common ground according to the positive and negative differential signal V Bat- .

[0069] More specifically, as Figure 5As shown, the differential detection circuit 211 includes: differential resistors R4 and R5, resistor R6, resistor R7, resistor R8, resistor R9, resistor R10, capacitors C1, C2, C3, C4, C5, C6, C7, clamping diodes D1 and D2, operational amplifier U1, and operational amplifier U2.

[0070] One end of the differential resistor R4 is connected to the first end of the second resistor module R2, and the other end is connected to one end of the resistor R6. The other end of the resistor R6 is connected to the positive terminal of the operational amplifier U1. One end of the differential resistor R5 is connected to the second end of the second resistor module R2, and the other end is connected to one end of the resistor R7. The other end of the resistor R7 is connected to the negative terminal of the operational amplifier U1. One end of the resistor R8 is connected to the positive terminal of the operational amplifier U1, and the other end is connected to the common ground. One end of the resistor R9 is connected to the output terminal of the operational amplifier U1, and the other end is connected to the resistor R10. The other end of the resistor R10 is connected to the negative terminal of the operational amplifier U1. One end of the capacitor C1 is connected to the positive terminal of the operational amplifier U1, and the other end is connected to the common ground. The capacitor C2 is connected in parallel between the positive and negative terminals of the operational amplifier U1. The capacitor C3 is connected in parallel between the negative terminal and the output terminal of the operational amplifier U1. The capacitor C4 is connected in parallel across the resistor R10. One end of the capacitor C5 is connected to one end of the resistor R9, and the other end is connected to the common ground. One end of the capacitor C6 is connected to the negative voltage source, and the other end is connected to the common ground. One end of the capacitor C7 is connected to the positive voltage source, and the other end is connected to the common ground. The first and second ends of the clamping diode D1 are connected to the positive terminal of the operational amplifier U1, and the third end of the clamping diode D1 is connected to the third end of the clamping diode D2. The first end of the clamping diode D2 is connected to the positive voltage source, and the second end is connected to the negative voltage source. The positive terminal of the operational amplifier U2 is connected to the output terminal of the operational amplifier U1, and the negative terminal of the operational amplifier U2 is connected to the output terminal of the operational amplifier U2.

[0071] More specifically, the AD conversion circuit 212 includes resistor R11, resistor R12, resistor R13, capacitors C8, C9, C10, operational amplifier U3, operational amplifier U4, resistor R14, capacitor C11, and clamping diode D3.

[0072] One end of the resistor R11 is connected to the output end of the operational amplifier U2, and the other end is connected to the positive electrode of the operational amplifier U3; one end of the resistor R12 is connected to the positive electrode of the operational amplifier U3, and the other end is connected to the common ground; one end of the resistor R13 is connected to the output end of the operational amplifier U3, and the other end is connected to the positive electrode of the operational amplifier U4, and the negative electrode of the operational amplifier U4 is connected to the output end of the operational amplifier U4. One end of the capacitor C8 is connected to the output end of the operational amplifier U2, and the other end is connected to the common ground; one end of the capacitor C9 is connected to the negative voltage source, and the other end is connected to the common ground; one end of the capacitor C10 is connected to the positive voltage source, and the other end is connected to the common ground. One end of the resistor R14 is connected to the output end of the operational amplifier U4, and the other end is connected to one end of the capacitor C11, and the other end of the capacitor C11 is connected to the common ground; the first end of the clamping diode D3 is connected to the positive voltage source, the second end is connected to the common ground, and the third end is connected to the output end of the operational amplifier U4.

[0073] Specifically, the positive voltage signal V PE-TEXT passes through the differential resistor R4, and the negative voltage signal V Bat-TEXT passes through the differential resistor R5. Then, the high-voltage signals directly output by the battery for the positive and negative voltages are converted into corresponding low-voltage signals V PE-TEXT-RES-IN 、V Bat-TEXT-RES-IN . Then, the operational amplifier U1 and the operational amplifier U2 perform differential amplification on the two converted signals and convert the two differential signals into a single common-ground voltage signal V PE-TEXT-IN to facilitate the signal processing of the subsequent calculation module. The common-ground voltage signal V PE-TEXT-IN is converted into a digital positive and negative differential signal V PE-TEXT-IN-ADC after passing through the operational amplifier U3 and the operational amplifier U4. The calculation module processes the digital positive and negative differential signals and outputs the positive electrode insulation impedance R Bat+ between the positive electrode of the battery under test and the common ground, and the negative electrode insulation impedance R Bat- between the negative electrode and the common ground.

[0074] In one embodiment, as Figure 6 shown, the switch module includes at least one switch S1. One end of the switch S1 is connected to the positive electrode of the battery under test, and the other end is connected to the first end of the first resistor module R1.

[0075] Optionally, as Figure 7 shown, the connection method of the switch S1 can also be: one end of the switch S1 is connected to the negative electrode of the battery under test, and the other end is connected to the second end of the second resistor module R2.

[0076] Specifically, when the switch switching signal generated by the controller, i.e., the IO signal, is sent to the switch S1, the switch S1 closes, and a voltage division loop is formed between the battery under test, the first resistor module R1, the second resistor module R2, the third resistor module R3, and the common ground.

[0077] In one embodiment, as Figure 8 shown, the switch module includes at least one switch S2 and at least one switch S3. One end of the switch S2 is connected to the second end of the first resistor module R1, and the other end is connected to the first end of the second resistor module R2; one end of the switch S3 is connected to the second end of the first resistor module R1, and the other end is connected to the first end of the third resistor module R3.

[0078] Optionally, the switch S2 can be connected at any position between the first end and the second end of the first resistor module R1 and the second resistor module R2.

[0079] Specifically, when the switch switching signal generated by the controller, i.e., the IO signal, is sent to the switches S2 and S3, the switches S2 and S3 close, so that a voltage division loop is formed between the battery under test, the first resistor module R1, the second resistor module R2, the third resistor module R3, and the common ground.

[0080] In one embodiment, the switch module includes a transistor Q1 and a relay SW1. The transistor Q1 is connected to the controller, and the relay SW1 is connected to the emitter of the transistor Q1. The switch module receives the switch switching signal generated by the controller, controls the conduction of the transistor Q1 to control the attraction of the relay SW1, so that a voltage division loop is formed between the battery under test, the first resistor module R1, the second resistor module R2, the third resistor module R3, and the common ground.

[0081] Specifically, as Figure 9 shown, the pins 3 and 6 of the relay SW1 are connected. The second end of the first resistor module R1 is connected to the pin 3 of the relay SW1, the first end of the second resistor module R2 is connected to the pin 4 of the relay SW1, and the first end of the third resistor module is connected to the pin 5 of the relay SW1. When the pin 3 and the pin 4 are closed and connected, and at the same time the pin 5 and the pin 6 are closed and connected, it is equivalent to the switch module S1 being closed.

[0082] In this embodiment, by controlling the attraction of the pins of the multi-channel relay SW1 through the transistor Q1, the conduction of the voltage division loop between the first resistor module R1, the second resistor module R2, the third resistor module R3, and the common ground PE is realized, and the detection efficiency of the battery is improved.

[0083] In one embodiment, the switch module can be composed of any switch components, including single-pole switches, transistors, etc.

[0084] In one embodiment, the first resistor module R1, the second resistor module R2, and the third resistor module R3 can be respectively composed of a plurality of resistors connected in series.

[0085] In one embodiment, a battery life detection device is provided, including the battery life detection circuit described in each of the above embodiments. The device is used to implement the functions of the modules described in each of the above embodiments.

[0086] In one embodiment, an electronic device is provided, including the battery life detection device and an alarm device described in the above embodiments. The alarm device is connected to the battery life detection device, and the alarm device is used to give a response alarm according to the life detection result output by the battery life detection device.

[0087] Specifically, if the life detection result shows that the battery has leakage or poor insulation, the alarm device is controlled to give a response alarm; otherwise, no alarm is given. The alarm device can be a buzzer or an LED lamp, etc.

[0088] In the description of this specification, the descriptions referring to terms "some embodiments", "other embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0089] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0090] The above-described embodiments only represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A battery life detection circuit, characterized in that: The circuit includes a first resistance module R1, a second resistance module R2, a third resistance module R3, a switch module, and a controller; The first end of the first resistor module R1 is used to connect the positive electrode of the battery to be tested, the second end of the first resistor module R1 is connected to the first end of the second resistor module R2, and the second end of the second resistor module R2 is used to connect the negative electrode of the battery to be tested; the first end of the third resistor module R3 is connected to the second end of the first resistor module R1, and the second end of the third resistor module R3 is connected to the common ground; the switch module is connected between the first resistor module R1, the second resistor module R2, the third resistor module R3 and the battery to be tested; The controller is connected to the switch module and is used to control the switch module to close, so that a voltage dividing loop is formed between the battery to be tested, the first resistor module R1, the second resistor module R2, the third resistor module R3 and a common ground; The first input end of the controller is connected to the first end of the second resistance module R2, and the second input end is connected to the second end of the second resistance module R2, and is used to collect the positive electrode voltage signal between the positive electrode of the battery to be tested and the common ground, and the negative electrode voltage signal between the negative electrode of the battery to be tested and the common ground based on the voltage divider circuit; and output the life detection result of the battery to be tested according to the positive electrode voltage signal and the negative electrode voltage signal.

2. The battery life detection circuit according to claim 1, characterized in that: The controller includes a voltage difference calculation module, a first storage module and a first judgment module, wherein the first judgment module is connected to the voltage difference calculation module and the first storage module. The voltage difference calculation module, whose first input end is connected to the first end of the second resistance module R2, and whose second input end is connected to the second end of the second resistance module R2, is used to calculate the positive and negative electrode voltage difference of the battery to be tested according to the positive electrode voltage signal and the negative electrode voltage signal; The first storage module is used to store standard voltage difference parameters; The first judgment module is used to compare the positive and negative voltage difference with the standard voltage difference parameter to obtain a first comparison result, and output the life detection result of the battery to be tested according to the first comparison result.

3. The battery life detection circuit according to claim 1, characterized in that: The controller includes an impedance calculation module, a second storage module and a second judgment module, wherein the second judgment module is connected to the impedance calculation module and the second storage module. The impedance calculation module is used to calculate the positive electrode insulation impedance between the positive electrode of the battery to be tested and the common ground, and the negative electrode insulation impedance between the negative electrode of the battery to be tested and the common ground according to the positive electrode voltage signal and the negative electrode voltage signal; The second storage module is used to store standard insulation impedance parameters; The second judgment module is used to compare the positive electrode insulation impedance, the negative electrode insulation impedance and the standard insulation impedance parameter to obtain a second comparison result, and output the life detection result of the battery to be tested according to the second comparison result.

4. The battery life detection circuit according to claim 3, characterized in that: The impedance calculation module comprises: A differential detection circuit, wherein a first input end thereof is connected to a first end of the second resistor module R2, and a second input end thereof is connected to a second end of the second resistor module R2, and is used to differentially amplify and level-convert the collected positive voltage signal and the negative voltage signal, and output a single common ground voltage signal; An AD conversion circuit, connected to the differential detection circuit, for digitally converting the common ground voltage signal and outputting a positive and negative differential signal; The calculation module is connected to the AD conversion circuit and is used to calculate the positive electrode insulation impedance between the positive electrode of the battery to be tested and the common ground, and the negative electrode insulation impedance between the negative electrode of the battery to be tested and the common ground according to the positive and negative electrode differential signals.

5. The battery life detection circuit according to claim 1, characterized in that: The switch module includes at least one switch S1, One end of the switch S1 is connected to the positive electrode of the battery to be tested, and the other end is connected to the first end of the first resistor module R1; or one end of the switch S1 is connected to the negative electrode of the battery to be tested, and the other end is connected to the second end of the second resistor module R2; The switch S1 is used to close or open after receiving the switch switching signal generated by the controller, so as to form a voltage dividing loop between the battery to be tested, the first resistance module R1, the second resistance module R2, the third resistance module R3 and the common ground.

6. The battery life detection circuit according to claim 1, characterized in that: The switch module includes at least one switch S2 and at least one switch S3. One end of the switch S2 is connected to the second end of the first resistor module R1, and the other end is connected to the first end of the second resistor module R2; one end of the switch S3 is connected to the second end of the first resistor module R1, and the other end is connected to the first end of the third resistor module R3; The switch S2 and the switch S3 are used to close after receiving the switch switching signal generated by the controller, so as to form a voltage dividing loop between the battery to be tested, the first resistance module R1, the second resistance module R2, the third resistance module R3 and the common ground.

7. The battery life detection circuit according to claim 1, characterized in that: The switch module includes a transistor Q1 and a relay SW1. The transistor Q1 is connected to the controller, and the relay SW1 is connected to the emitter of the transistor Q1. The switch module is used to receive the switch switching signal generated by the controller, control the conduction of the transistor Q1 to control the relay SW1 to be attracted, so that a voltage dividing loop is formed between the battery to be tested, the first resistance module R1, the second resistance module R2, the third resistance module R3 and the common ground.

8. The battery life detection circuit according to claim 1, characterized in that: The resistance values ​​of the first resistance module R1 and the second resistance module R2 are equal.

9. A battery life detection device, characterized in that: A battery life detection circuit comprising a battery as claimed in any one of claims 1 to 8.

10. An electronic device, characterized in that: The device comprises the battery life detection device and an alarm device as claimed in claim 9, wherein the alarm device is connected to the battery life detection device. The alarm device is used to respond to the alarm according to the life detection result output by the battery life detection device.

Images