Lithium iron phosphate lithium ion battery with power consumption early warning function

Abstract

The utility model discloses a lithium ion battery of lithium iron phosphate with power consumption early warning function, including battery group, low frequency pulse circuit, control circuit, sampling circuit, low power early warning circuit, low frequency pulse circuit is used to produce low frequency pulse signal, control circuit is used to according to low frequency pulse signal control the working condition of sampling circuit, sampling circuit is used to the power of battery group is sampled, low power early warning circuit is used to send early warning signal when the battery power that sampling circuit acquires is lower than the preset threshold value. Its remarkable effect is: not only realizes intermittent flashing display remaining power, and the display mode is easier to cause the attention of user, and the battery power indication circuit indication effect is better, still effectively reduced the power consumption of power consumption early warning module.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery technology, specifically to a lithium iron phosphate lithium-ion battery with a power depletion warning function. Background Technology

[0002] Currently, lithium iron phosphate batteries are mainly used in power batteries. During use, batteries with low charge may be over-discharged, while batteries with high charge may be over-charged, resulting in excessive battery wear and affecting the overall lifespan of the lithium-ion battery pack. Therefore, it is necessary to estimate the remaining capacity of lithium iron phosphate batteries.

[0003] However, in existing lithium-ion battery power indicator circuits, the remaining battery power is typically indicated by a constantly lit LED. This method is unreliable when the battery is nearly depleted, making it difficult to attract the user's attention and resulting in poor indicator performance. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a lithium iron phosphate battery with a power depletion warning function. This battery can not only intermittently display the remaining power and provide a power depletion warning, but also effectively reduce the power consumption of the power depletion warning module.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A lithium iron phosphate lithium-ion battery with a low-power warning function, the key components of which include: a battery pack, a low-frequency pulse circuit, a control circuit, a sampling circuit, and a low-power warning circuit, wherein:

[0007] The low-frequency pulse circuit is used to generate low-frequency pulse signals;

[0008] The control circuit is used to control the operating state of the sampling circuit according to the low-frequency pulse signal;

[0009] The sampling circuit is used to sample the power level of the battery pack;

[0010] The low battery warning circuit is used to issue a warning signal when the battery level obtained by the sampling circuit is lower than a preset threshold.

[0011] Furthermore, the battery also includes an energy harvesting and power supply module, which is used to obtain electrical energy from the battery pack to power the low-frequency pulse circuit.

[0012] Furthermore, the power supply module includes a power extraction circuit and an overvoltage protection circuit. The voltage input terminal of the power extraction circuit is connected to the positive terminal of the battery pack, the voltage output terminal of the power extraction circuit is connected to the voltage input terminal of the overvoltage protection circuit, and the voltage output terminal of the overvoltage protection circuit is connected to the voltage input terminal of the low-frequency pulse circuit.

[0013] Furthermore, the battery also includes a power monitoring circuit, the input of which is connected to the output of the sampling circuit, for indicating the battery power obtained by the sampling circuit.

[0014] Furthermore, the low-frequency pulse circuit adopts an oscillation circuit based on an oscillation device, which is one of a crystal oscillator, Wien bridge oscillator, LC oscillator, RC oscillator, analog circuit oscillator, digital circuit monostable multivibrator, or astable multivibrator.

[0015] Furthermore, the control components used in the control circuit are microcontrollers, optocouplers, transistors, operational amplifiers, or relays.

[0016] Furthermore, the warning signal is at least one of the following: light flashing frequency, light color change, or sound prompt.

[0017] The significant advantages of this invention are:

[0018] 1. A low-frequency pulse signal is generated by a low-frequency pulse circuit. The low-frequency pulse signal drives the control circuit to send a control signal to the sampling circuit to sample the battery pack's power level. The power level is then displayed by the power monitoring circuit. The low power warning circuit issues a warning when the battery level is below a preset threshold. This achieves the functions of intermittently flashing the remaining power level and warning when the battery is depleted. Compared with existing technologies, this not only achieves intermittent flashing of the remaining power level, but also makes the display method more attractive to users. The battery power indicator circuit has a better indication effect and effectively reduces the power consumption of the power depletion warning module.

[0019] 2. The low-frequency pulse circuit can reduce the pulse frequency to lengthen the interval time and reduce the pulse width to shorten the flashing duration, thereby further reducing the energy consumption of the power monitoring circuit. In the specific implementation process, the flashing cycle and duration can be adjusted as needed to achieve the purpose of automatically displaying the remaining power with the lowest power consumption.

[0020] 3. The low battery warning circuit has multiple warning methods, which makes it easier to attract the user's attention and improves the effectiveness of use. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the circuit structure of this utility model;

[0022] Figure 2 This is the circuit diagram of a low-frequency pulse circuit;

[0023] Figure 3 It is the circuit schematic of the control circuit and the sampling circuit;

[0024] Figure 4 This is the circuit diagram of the power monitoring circuit;

[0025] Figure 5 This is the circuit diagram of a low battery warning circuit;

[0026] Figure 6 This is the circuit diagram of an overvoltage protection circuit. Detailed Implementation

[0027] The specific embodiments and working principle of this utility model will be further described in detail below with reference to the accompanying drawings. Example

[0028] like Figure 1 As shown, a lithium iron phosphate lithium-ion battery with a low battery warning function includes a casing and a battery pack and circuit board disposed within the casing. The circuit board includes an energy harvesting and power supply module, a low-frequency pulse circuit, a control circuit, a sampling circuit, a power monitoring circuit, and a low battery warning circuit. Specifically:

[0029] The power supply module is used to obtain electrical energy from the battery pack to power the low-frequency pulse circuit.

[0030] The low-frequency pulse circuit is used to generate low-frequency pulse signals;

[0031] The control circuit is used to control the operating state of the sampling circuit according to the low-frequency pulse signal;

[0032] The sampling circuit is used to sample the power level of the battery pack;

[0033] The input terminal of the power monitoring circuit is connected to the output terminal of the sampling circuit, and is used to intermittently indicate the battery power obtained by the sampling circuit.

[0034] The low battery warning circuit is used to issue a warning signal when the battery level obtained by the sampling circuit is lower than a preset threshold.

[0035] Based on the above circuit structure, it can be seen that the power supply module obtains power from the battery pack to power the low-frequency pulse circuit. The low-frequency pulse circuit generates a low-frequency pulse signal, which drives the control circuit to send a control signal to the sampling circuit to sample the battery pack's power. The sampled remaining power is displayed through the power monitoring circuit and a low power warning circuit issues a warning when the battery power is below a preset threshold. This achieves the function of intermittently flashing the remaining power and issuing a power depletion warning, thereby effectively overcoming the defects of the existing technology.

[0036] In implementation, the low-frequency pulse signal generated by the low-frequency pulse circuit is based on the generation of an oscillation circuit. By properly designing the parameters of the oscillation device, a pulse waveform with a very narrow bandwidth can be generated. Currently, oscillation circuits mainly consist of crystal oscillators, Wien bridge oscillators, LC oscillators, RC oscillators, analog circuit oscillators, and digital circuit monostable multivibrators and astable multivibrators. To achieve power saving, this patent uses low-power oscillation circuits to generate pulses as much as possible.

[0037] The low-frequency pulse signal is characterized by using a narrow-bandwidth low-frequency pulse signal generated by an oscillation circuit, which can be adjusted as needed to achieve optimal power saving. Preferably, the pulse interval can be adjusted between 0.1s and 100s, and the pulse width can be adjusted between 1ns and 10s. The low-frequency pulse signal is as follows: Figure 2 As shown. The waveform of the low-frequency pulse signal is as follows. Figure 3 As shown, it can be a square wave, triangle wave, sawtooth wave, trapezoidal wave, etc., as long as it can control the display circuit to flash intermittently or provide sound prompts.

[0038] Please refer to the appendix for the circuit structure of the low-frequency pulse circuit in this embodiment. Figure 2 It includes a dual-time base circuit U1. The second pin EA+ of the dual-time base circuit U1 is connected to the sliding end of the resistor R11. The two fixed ends of the resistor R11 are connected between the voltage output terminal VCC of the power supply module and the ground terminal, respectively. The fifth pin CT and the seventh pin Discharge of the dual-time base circuit U1 are connected and then grounded through the capacitor C11. The sixth pin RT of the dual-time base circuit U1 is grounded through the resistors R12 and R13. The sliding end of the resistor R13 is also grounded. The thirteenth pin of the dual-time base circuit U1 outputs a low-frequency pulse signal.

[0039] Therefore, one channel of the dual-time base circuit U1, together with resistors R11 and R13, and capacitor C11, forms a multivibrator. The low-frequency pulse signal generated can be adjusted by changing the values ​​of resistor R13 and capacitor C11, while adjusting the value of resistor R11 can adjust the pulse width. The pulse interval can be between 0.1s and 100s, and the pulse width can be between 1ns and 10s, adjustable according to actual needs. This allows users to easily observe the remaining battery power while significantly reducing the power consumption of the display device.

[0040] The aforementioned low-frequency pulse circuit can reduce the pulse frequency to lengthen the interval time and reduce the pulse width to shorten the flashing duration, thereby further reducing the energy consumption of the power monitoring circuit. In specific implementation, the flashing cycle and duration can be adjusted as needed to achieve the purpose of automatically displaying the remaining power with the lowest power consumption.

[0041] In implementation, the control circuit can use microcontrollers, optocouplers, transistors, operational amplifiers, or relays to intermittently control the sampling circuit to sample battery power. Since optocoupler circuits are simple and practical, this embodiment uses optocouplers to control the sampling circuit. See the appendix for the specific circuit. Figure 3 The input terminal of optocoupler U2 is connected to the output terminal of the low-frequency pulse circuit via resistor R21, and the output terminal of optocoupler U2 is grounded via resistor R22. That is, the sampling circuit is resistor R22. When optocoupler U2 is turned on, the battery pack and resistor R22 are connected. Battery power detection can be achieved by detecting the amount of charge applied to resistor R22.

[0042] In implementation, the power monitoring circuit can display the remaining power through methods such as digital tube display of percentage, changes in LED color, flashing frequency, or number of LEDs, or even other methods such as voice announcements, audio sounds, or vibrations. However, the main feature of this embodiment is that it does not continuously display the power level, but rather uses pulse control to indicate it intermittently. This intermittent display or indication method can significantly save energy consumption. Please refer to the appendix for the circuit structure of the power monitoring circuit. Figure 4This circuit includes resistors R31 and R32, a first comparator U3A, a second comparator U3B, a third comparator U3C, and a fourth comparator U3D. One end of resistor R31 is connected to the output of the sampling circuit, and the other end of resistor R31 is connected to one end of resistor R32. The other end of resistor R32 is connected to the cathode of Zener diode D6, and the anode of Zener diode D6 is grounded. The other end of resistor R32 is also connected to the non-inverting input of the first comparator U3A and one end of resistor R35. The other end of resistor R35 is connected to the non-inverting input of the second comparator U3B and one end of resistor R36. The other end of resistor R36 is connected to the non-inverting input of the third comparator U3C and one end of resistor R37. The other end of resistor R37 is connected to the non-inverting input of the fourth comparator U3D and one end of resistor R38. The other end of resistor R38 is grounded. The negative input of the first comparator U3A... The negative input terminals of the first comparator U3A, the second comparator U3B, the third comparator U3C, and the fourth comparator U3D are all connected to one end of resistor R33. The other end of resistor R33 is connected to the other end of resistor R31. The output terminal of the first comparator U3A is connected to the cathode of LED D1. The anode of LED D1 is connected to the other end of resistor R310 and resistor R31. The output terminal of the second comparator U3B is connected to the cathode of LED D2. The anode of LED D2 is connected to the other end of resistor R311 and resistor R31. The output terminal of the third comparator U3C is connected to the cathode of LED D3. The anode of LED D3 is connected to the other end of resistor R312 and resistor R31. The output terminal of the fourth comparator U3D is connected to the cathode of LED D4. The anode of LED D4 is connected to the other end of resistor R313 and resistor R31.

[0043] In this example, the first comparator U3A, the second comparator U3B, the third comparator U3C, and the fourth comparator U3D use the LM324 comparator chip based on the OPAMP. Based on the circuit structure described above, whenever the non-inverting terminal of a specific OPAMP is at a higher potential than the inverting terminal, the OPAMP output will be pulled high to a level approximately equal to the sampling circuit output voltage VDD, which in this embodiment is the battery voltage being measured. Because the anode and cathode voltages of the LED are equal at this point, no current flows, and the LED will not light up. If the voltage at the inverting terminal is higher than the voltage at the non-inverting terminal, the OPAMP output will be pulled low to ground, and the LED will light up due to the potential difference between its two ends. In this embodiment, four resistors with the same resistance value (R35, R36, R37, and R38) are connected in series to ground. Each resistor has the same voltage drop, which is used to compare with the battery voltage. By configuring the resistor values, the voltage point at which the corresponding LED is lit can be determined. In this embodiment, four LEDs are used to indicate the battery level. When the first LED, D1, is lit, the battery level is 0-25%. When the second LED, D2, is lit, the battery level is 26-50%. When the third LED, D3, is lit, the battery level is 51-75%. When the fourth LED, D4, is lit, the battery level is 76-100%.

[0044] During implementation, the low battery alarm circuit primarily uses methods such as flashing light frequency, color changes, or audible alerts. Please refer to the appendix for the specific circuit diagram. Figure 5 The circuit includes a voltage comparator U4. The inverting input of the voltage comparator U4 is connected to the output of the sampling circuit via resistor R41. The non-inverting input of the voltage comparator U4 is connected to the sliding end of resistor R43. The two fixed ends of resistor R43 are connected to the output of the sampling circuit and the ground terminal, respectively. The output of the voltage comparator U4 is connected to the cathode of LED D7. The anode of LED D7 is connected to the output of the sampling circuit via resistor R42. The output of the voltage comparator U4 is also connected to the output of the sampling circuit via buzzer H1. The inverting input of the voltage comparator U4 is also grounded via a reverse-biased Zener diode D6.

[0045] When the non-inverting terminal of voltage comparator U4 is at a higher potential than the inverting terminal, the output of voltage comparator U4 will be pulled high to approximately VDD voltage level, which in this embodiment is the voltage of the battery being measured. Since the anode and cathode voltages of LED D7 are equal here, no current flows, and LED D7 will not light up; similarly, buzzer H1 will not sound. If the voltage at the inverting terminal is higher than the voltage at the non-inverting terminal, the output of voltage comparator U4 will be pulled low to ground level, and LED D7 will light up due to the potential difference between its two terminals, while buzzer H1 will sound an alarm.

[0046] Preferably, the Zener diode D6 is a Zener diode, and the warning start-up power can be adjusted by adjusting the resistance value of resistor R43.

[0047] See appendix Figure 6 In this embodiment, the overvoltage protection circuit includes resistors R51 and R52, transistor Q1, and Zener diode D8. One end of resistor R51 is connected to the positive terminal of the battery pack, and the other end of resistor R51 is connected to the collector of transistor Q1. The other end of resistor R51 is also connected to the cathode of Zener diode D8 via resistor R52. The anode of Zener diode D8 is grounded. The base of transistor Q1 is connected to the common connection point of resistor R52 and Zener diode D8. The emitter of transistor Q1 outputs a working voltage VCC to power the low-frequency pulse circuit.

[0048] In summary, in the battery described in this embodiment, the low-frequency pulse circuit generates a low-frequency pulse signal, which drives the control circuit to send a control signal to the sampling circuit to sample the battery pack's power level. The power level is then displayed by the power monitoring circuit, and the low power warning circuit issues a warning when the battery level is below a preset threshold. This achieves the functions of intermittently flashing the remaining power level and providing a power depletion warning. Compared to existing technologies, this not only achieves intermittent flashing of the remaining power level with a display method that is more likely to attract the user's attention, but also provides a better indication effect from the battery power indicator circuit and effectively reduces the power consumption of the power depletion warning module.

[0049] The technical solution provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A lithium iron phosphate lithium-ion battery with a power depletion warning function, comprising a battery pack, characterized in that: It also includes a low-frequency pulse circuit, a control circuit, a sampling circuit, and a low battery warning circuit, among which: The low-frequency pulse circuit is used to generate low-frequency pulse signals; The control circuit is used to control the operating state of the sampling circuit according to the low-frequency pulse signal; The sampling circuit is used to sample the power level of the battery pack; The low battery warning circuit is used to issue a warning signal when the battery level obtained by the sampling circuit is lower than a preset threshold.

2. The lithium iron phosphate lithium-ion battery with a power depletion warning function according to claim 1, characterized in that: It also includes an energy harvesting and power supply module, which is used to obtain electrical energy from the battery pack to power the low-frequency pulse circuit.

3. The lithium iron phosphate lithium-ion battery with a power depletion warning function according to claim 2, characterized in that: The power supply module includes a power extraction circuit and an overvoltage protection circuit. The voltage input terminal of the power extraction circuit is connected to the positive terminal of the battery pack, the voltage output terminal of the power extraction circuit is connected to the voltage input terminal of the overvoltage protection circuit, and the voltage output terminal of the overvoltage protection circuit is connected to the voltage input terminal of the low-frequency pulse circuit.

4. The lithium iron phosphate lithium-ion battery with a power depletion warning function according to claim 1, characterized in that: It also includes a power monitoring circuit, the input of which is connected to the output of the sampling circuit, for indicating the battery power obtained by the sampling circuit.

5. The lithium iron phosphate lithium-ion battery with a power depletion warning function according to any one of claims 1-4, characterized in that: The low-frequency pulse circuit adopts an oscillation circuit based on an oscillation device, which is one of the following: crystal oscillator, Wien bridge oscillator, LC oscillator, RC oscillator, analog circuit oscillator, digital circuit monostable multivibrator, or astable multivibrator.

6. The lithium iron phosphate lithium-ion battery with a power depletion warning function according to any one of claims 1-4, characterized in that: The control components used in the control circuit are microcontrollers, optocouplers, transistors, operational amplifiers, or relays.

7. The lithium iron phosphate lithium-ion battery with a power depletion warning function according to any one of claims 1-4, characterized in that: The warning signal is at least one of the following: light flashing frequency, light color change, or sound prompt.

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