Battery health detection circuit and detection terminal

Abstract

This utility model discloses a battery health detection circuit and detection terminal, including: a voltage detection module, a load module, a control module, and a load switching module; the control module is electrically connected to the load module through the load switching module; the load module is electrically connected to the control module through the voltage detection module; the positive terminal of the load is electrically connected to the positive terminal of the battery. Beneficial effects: Through dynamic load switching and voltage difference detection, the battery health status can be predicted in advance, avoiding the interruption of backup power function due to sudden battery failure, and ensuring that the equipment can still work normally when the mains power is lost.

Description

Technical Field

[0001] This utility model relates to the field of battery testing, and in particular to a battery health testing circuit and testing terminal. Background Technology

[0002] Smart terminal products are generally powered by mains electricity and use backup batteries in emergencies. However, there is a lack of prediction of battery health status, and batteries are often replaced periodically or only after they are damaged.

[0003] Therefore, it is necessary to test the backup battery. Currently, ADC (Analog-to-Digital Converter) detection is used to obtain voltage signals, and the battery health status is determined by judging the voltage threshold.

[0004] However, since the backup battery is only used after the mains power fails, it has no load when the mains power is available. Therefore, the ADC detection cannot reflect the load-carrying capacity and the voltage when the mains power is on. If the mains power fails to detect the battery, the battery health may already be very poor or damaged, and the backup power function will not be available when the mains power fails.

[0005] The detection is lagging. When there is mains power, the ADC detects that the voltage is below the threshold, indicating that the battery can no longer be charged, the battery is damaged, and it can no longer function as a backup power source after the mains power is cut off. Utility Model Content

[0006] Purpose of this utility model: The purpose of this utility model is to solve the problems in the prior art and provide a battery health detection circuit, including: a voltage detection module, a load module, a control module, and a load switching module;

[0007] The control module is electrically connected to the load module through a load switching module;

[0008] The load module is electrically connected to the control module through a voltage detection module;

[0009] The positive terminal of the load is electrically connected to the positive terminal of the battery;

[0010] The control module is used to switch between two modes: no-load and loaded, via the load switching module.

[0011] The voltage detection module is used to obtain the difference between the first voltage value and the second voltage value when the load is unloaded and under load.

[0012] Preferably, the voltage detection module includes a first resistor and a second resistor;

[0013] The first resistor is electrically connected to the second resistor and the control module. One end of the first resistor is electrically connected to the battery and the load module, and the other end of the second resistor is grounded.

[0014] Preferably, the voltage detection module further includes a capacitor;

[0015] The second resistor and capacitor are connected in parallel.

[0016] Preferably, the load module includes a third resistor and a fourth resistor, which are connected in parallel. One end of the third resistor is electrically connected to the battery, and the other end of the third resistor is electrically connected to the load switching module.

[0017] Preferably, the load switching module includes a transistor and a fifth resistor;

[0018] The base of the transistor is electrically connected to the control module through the fifth resistor;

[0019] The collector of the transistor is electrically connected to the negative terminal of the load module.

[0020] Preferably, the load switching module further includes a sixth resistor;

[0021] The base of the transistor is electrically connected to the emitter of the transistor through a sixth resistor, and the emitter of the transistor is grounded.

[0022] Preferably, the control module is the main control chip.

[0023] This application also proposes a detection terminal, including the detection circuit described in the above embodiments.

[0024] Beneficial effects:

[0025] By using dynamic load switching and voltage difference detection, the battery health status can be predicted in advance, avoiding the interruption of backup power function due to sudden battery failure, and ensuring that the equipment can still work normally when the mains power fails.

[0026] When mains power is available, a dynamic load (millisecond level) is actively applied to simulate a real load scenario and detect changes in battery voltage. This solves the problems of inaccuracy and lag in traditional no-load detection (ADC) and avoids the situation of passively replacing the battery only after it is damaged.

[0027] By accurately assessing battery health, batteries can be replaced only when necessary, avoiding the waste of healthy batteries caused by regular replacements. This also reduces the need for emergency maintenance due to battery failure, lowering maintenance costs and resource waste.

[0028] It adopts pure hardware control combined with software logic, with a simple circuit structure, no need for complex algorithms or high-cost components, and is suitable for various battery types. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of this utility model;

[0030] Figure 2 This is a schematic diagram of the circuit structure of this utility model.

[0031] Figure label:

[0032] 1. Voltage detection module; 2. Control module; 3. Load switching module; 4. Load module. Detailed Implementation

[0033] To make the technical solution of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Example 1

[0035] To make the technical solution of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "comprising" and similar expressions used herein mean that the element or object preceding the word covers the element or object listed following the word and its equivalents, but does not exclude other elements or objects.

[0037] In response to the problems existing in the current technology, combined with Figure 1-2 A battery health detection circuit includes: a voltage detection module 1, a load module 4, a control module 2, and a load switching module 3.

[0038] The control module 2 is electrically connected to the load module 4 through the load switching module 3;

[0039] The load module 4 is electrically connected to the control module 2 through the voltage detection module 1;

[0040] The positive terminal of the load module 4 is electrically connected to the positive terminal of the battery BAT;

[0041] The control module 2 is used to switch between two modes, namely no-load and loaded, through the load switching module 3.

[0042] The voltage detection module 1 is used to obtain the difference between the first voltage value and the second voltage value when the load is unloaded and under load.

[0043] In some specific embodiments, the voltage detection module 1 includes a first resistor R1 and a second resistor R2;

[0044] The first resistor R1 is electrically connected to the second resistor R2 and the control module 2. One end of the first resistor R1 is electrically connected to the battery BAT and the load module 4, and the other end of the second resistor R2 is grounded to GND.

[0045] Specifically, the first resistor R1 and the second resistor R2 are voltage divider resistors that divide the high voltage of the battery BAT to a safe range suitable for ADC sampling. Through a resistor voltage divider network (such as the first resistor R1 and the second resistor R2 connected in series), the battery voltage (such as 12V) is reduced to the ADC input range (such as 0-3.3V), ensuring detection accuracy and protecting the ADC module.

[0046] In some specific embodiments, the voltage detection module 1 further includes a capacitor C1;

[0047] The second resistor R2 and capacitor C1 are connected in parallel.

[0048] Specifically, the filter capacitor C1 filters out high-frequency noise in the circuit, stabilizes the ADC sampling voltage, and is connected in parallel at the output of the voltage divider resistor and the input of the ADC.

[0049] In some specific embodiments, the load module 4 includes a third resistor R3 and a fourth resistor R4, which are connected in parallel. One end of the third resistor R3 is electrically connected to the battery BAT, and the other end of the third resistor R3 is electrically connected to the load switching module 3.

[0050] In some specific embodiments, the load switching module 3 includes a transistor Q1 and a fifth resistor R5;

[0051] The base of the transistor Q1 is electrically connected to the control module 2 through the fifth resistor R5;

[0052] The collector of the transistor Q1 is electrically connected to the negative electrode of the load module 4.

[0053] Specifically, the fifth resistor R5 limits the current from the control signal source to the transistor Q1 to prevent excessive current from damaging the transistor Q1.

[0054] In some specific embodiments, the load switching module 3 further includes a sixth resistor R6;

[0055] The base of transistor Q1 is electrically connected to the emitter of transistor Q1 through the sixth resistor R6, and the emitter of transistor Q1 is grounded to GND.

[0056] Specifically, pull down the sixth resistor R6 to ensure that when the BAT_DEC signal is not activated (low level), the transistor Q1 is in a clearly low level state, preventing false turn-on and enhancing the circuit's anti-interference capability.

[0057] In some specific embodiments, the control module 2 is the main control chip.

[0058] This application also proposes a detection terminal, including the detection circuit described in the above embodiments.

[0059] In practice,

[0060] The third resistor R3 and the fourth resistor R4 are the assumed loads for testing in this application, which facilitates testing.

[0061] The battery BAT is connected to the third resistor R3 and the fourth resistor R4, and is grounded to GND through the transistor Q1.

[0062] One end of capacitor C1 is connected to the main control chip of control module 2, as shown in the figure (ADC_BACK BAT). The main control chip is an existing mature chip used to acquire voltage signals.

[0063] One end of the fifth resistor R5, as shown in the figure, is also connected to the main control chip of the control module 2. It is used to control the output of a high-level signal or a low-level signal. This application only performs detection when there is mains power to test the dynamic data of the battery BAT. When BAT DEC is given a high level, the transistor Q1 does not conduct, and the load module 4 and the battery BAT cannot form a circuit. The open-circuit voltage of the battery BAT, i.e., the first voltage value, is directly detected through the ADC_BACK BAT terminal.

[0064] When BAT DEC is given a low level, transistor Q1 is turned on, and a circuit is formed between load module 4 and battery BAT. At this time, the detected voltage is the voltage of battery BAT under load, which is the second voltage value. The health status of the battery is determined by comparing the voltage difference and comparing it with the battery health status truth table of the prior art.

[0065] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A battery health detection circuit, characterized in that, include: Voltage detection module, load module, control module, load switching module; The control module is electrically connected to the load module through a load switching module; The load module is electrically connected to the control module through a voltage detection module; The positive terminal of the load module is electrically connected to the positive terminal of the battery; The control module is used to switch between two modes: no-load and loaded, via the load switching module. The voltage detection module is used to obtain the difference between the first voltage value and the second voltage value when the load is unloaded and under load.

2. The battery health detection circuit according to claim 1, characterized in that, The voltage detection module includes a first resistor and a second resistor; The first resistor is electrically connected to the second resistor and the control module. One end of the first resistor is electrically connected to the battery and the load module, and the other end of the second resistor is grounded.

3. The battery health detection circuit according to claim 2, characterized in that, The voltage detection module also includes a capacitor; The second resistor and capacitor are connected in parallel.

4. The battery health detection circuit according to claim 1, characterized in that, The load module includes a third resistor and a fourth resistor, which are connected in parallel. One end of the third resistor is electrically connected to the battery, and the other end of the third resistor is electrically connected to the load switching module.

5. A battery health detection circuit according to claim 1, characterized in that, The load switching module includes a transistor and a fifth resistor; The base of the transistor is electrically connected to the control module through the fifth resistor; The collector of the transistor is electrically connected to the negative terminal of the load module.

6. The battery health detection circuit according to claim 5, characterized in that, The load switching module also includes a sixth resistor; The base of the transistor is electrically connected to the emitter of the transistor through a sixth resistor, and the emitter of the transistor is grounded.

7. The battery health detection circuit according to claim 1, characterized in that, The control module is the main control chip.

8. A detection terminal, characterized in that, Includes the detection circuit as described in any one of claims 1-7.

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