Automatic activation circuit for single lithium thionyl chloride battery

Abstract

The utility model discloses an automatic activation circuit for a single lithium thionyl chloride battery, which comprises a lithium thionyl chloride battery to be activated, a voltage detection circuit, an activation completion indicating circuit, an activation latch circuit, an activation circuit and an activation indicating circuit. And the condition that the battery cannot be discharged in the use process due to battery passivation is avoided. Existing lithium thionyl chloride battery activation equipment is tedious and inconvenient to use, the equipment is large and inconvenient to carry on site, and the lithium thionyl chloride battery activation device is simple and effective, and is convenient to carry when being manufactured. The application scene is widened, and the device can be applied to lithium thionyl chloride battery power supply equipment, such as a lithium thionyl chloride battery power supply portable power supply, and can be activated for use without taking out the lithium thionyl chloride battery; an innovative activation latch circuit is included, the lithium thionyl chloride battery is only activated once during startup, redundant activation actions are not triggered even if the electric quantity is reduced or the power is temporarily cut off, and an intelligent control mechanism ensures that the battery is safe and stable to use.

Description

Technical Field

[0001] This utility model relates to the field of battery circuits, and in particular to an automatic activation circuit for a single-cell lithium-ion battery. Background Technology

[0002] As a special type of chemical power source, lithium-thionyl chloride (LTC) batteries inevitably undergo passivation during long-term storage, a phenomenon inherent to LTC batteries themselves. The degree of passivation is closely related to storage time and environmental conditions.

[0003] A deeper examination reveals that the passivation is primarily due to complex chemical reactions occurring within the battery. Metallic lithium reacts with thionyl chloride, gradually forming a dense lithium chloride film on the positive electrode surface. This film acts as a robust barrier, significantly hindering further reactions between lithium and thionyl chloride. This barrier is particularly pronounced during the initial discharge phase, causing a sharp increase in internal resistance. Under these conditions, the battery cannot release a large current instantaneously, leading to a rapid voltage drop. This poses a serious problem for devices requiring high current startup or demanding stable voltage operation.

[0004] To reuse these passivated lithium-ion batteries, technicians typically need to activate them. Currently, the industry standard activation method involves gradually removing the lithium chloride film adhering to the positive electrode through discharge. However, this process is often complex and difficult to visually assess. Therefore, designing a circuit and device that is both simple to use and allows for visual monitoring of the activation process is crucial. Such a design would not only simplify the operation but also ensure the effectiveness and reliability of the activation process.

[0005] The technical solution mentioned in existing patent document CN217240347U uses a voltage detection chip in conjunction with a MOSFET to activate a lithium-ion battery. Specifically, the MOSFET is activated when the detected voltage is below a certain threshold and deactivated when it is above the threshold. However, this solution has several problems: First, the circuit cannot ensure that the battery voltage is below the detection voltage of the voltage detection chip at the moment the battery is connected. Since the passivated lithium-ion battery simply cannot release a large current instantaneously, its voltage is not necessarily very low, which may prevent it from entering the activation state. Second, due to the lack of a latching circuit, once the battery voltage decreases after activation, it will re-enter the activation state, thus falling into a cyclic activation process.

[0006] The above background information is provided only to aid in understanding the concept and technical solution of this utility model. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above information was disclosed on the filing date of this patent application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Utility Model Content

[0007] The purpose of this invention is to propose an automatic activation circuit for a single-cell lithium-ion battery to solve the technical problems of complex operation, cumbersome equipment, and repeated activation caused by the lack of a latching circuit in the existing technology.

[0008] To solve the above technical problems, the present invention adopts the following technical solution.

[0009] An automatic activation circuit for a single-cell lithium-ion battery includes a lithium-ion battery to be activated, a voltage detection circuit, an activation completion indicator circuit, an activation latch circuit, an activation circuit, and an activation indicator circuit. The lithium-ion battery to be activated is connected to the voltage detection circuit, the voltage detection circuit is connected to the activation completion indicator circuit, the activation completion indicator circuit is connected to the activation latch circuit, the activation latch circuit is connected to the activation circuit, and the activation circuit is connected to the activation indicator circuit.

[0010] Furthermore, the positive terminal of the lithium-ion battery to be activated is connected to one end of resistor R2, and the negative terminal is connected to ground.

[0011] Furthermore, the VIN pin of the voltage detection circuit U1 is connected to the positive terminal of the battery through resistor R2, the GND pin is connected to ground, and the other pins are connected to the activation circuit and the activation completion indicator circuit for control and signal transmission.

[0012] Furthermore, one end of resistor R9 in the activation completion indicator circuit is connected to the relevant pin of U1, and the other end is connected to the positive terminal of LED LD2 for current limiting; one end of resistor R11 is connected to the base of NPN transistor Q3, and the other end is connected to one end of current limiting resistor R9; the negative terminal of LD2 is connected to ground, and the activation completion indication is realized through the control signal of U1.

[0013] Furthermore, the drain of the NMOS transistor Q1 in the activation latch circuit is connected to the relevant components of the activation circuit via resistor R7, the source is connected to the base of the NPN transistor Q3, and the gate is connected to the relevant components of the activation indicator circuit for latching the activation state; resistor R12 is connected between the source of NMOS transistor Q1 and ground, and resistor R7 is connected between the drain of NMOS transistor Q1 and the relevant components for setting appropriate operating conditions; the base of NPN transistor Q3 is connected to the source of NMOS transistor Q1, the emitter is connected to ground, and the collector is connected to the relevant components for auxiliary control.

[0014] Furthermore, in the activation circuit, one end of resistor R6 is connected to the power supply, and the other end is connected to the collector of NPN transistor Q3; one end of resistor R8 is connected to the collector of NPN transistor Q3, and the other end is connected to the base of NPN transistor Q2; one end of resistor R10 is connected to the base of NPN transistor Q3, and the other end is connected to ground; capacitor C1 is connected in parallel across resistor R8; resistors R3, R4, and R5 are connected in parallel, with one end connected to the power supply and the other end connected to the negative terminal of LD1.

[0015] Furthermore, one end of the resistor R1 in the activation indicator circuit is connected to the power supply, and the other end is connected to the positive terminal of the light-emitting diode LD1 for current limiting; the negative terminal of LD1 is connected to the collector of the NPN transistor Q2, and the transistor controls the on / off state of the light-emitting diode; the base of the NPN transistor Q2 is connected to the relevant components of the activation circuit, and the emitter is connected to ground.

[0016] Furthermore, the voltage detection circuit includes a voltage detection chip U1, model SSP61CC3002MR; a resistor R2 with a resistance of 510RΩ; and a capacitor C2 with a capacitance of 100nF.

[0017] Furthermore, the activation completion indication circuit includes a voltage detection chip U1, model SSP61CC3002MR; a resistor R9 with a resistance value of 20KΩ; a resistor R11 with a resistance value of 4.7KΩ; and a light-emitting diode LD2, which is a green light-emitting diode.

[0018] Furthermore, the activation latch circuit includes an NMOS transistor Q1, model 2N7002; a resistor R7, with a resistance of 4.7KΩ; a resistor R12, with a resistance of 51KΩ; and an NPN transistor Q3, model S8050.

[0019] Furthermore, the activation circuit includes resistor R6 with a resistance of 1KΩ; resistor R8 with a resistance of 330Ω; resistor R10 with a resistance of 1MΩ; capacitor C1 with a capacitance of 100nF; NPN transistor Q2, model FZT651TA; resistor R3 with a resistance of 100Ω; resistor R4 with a resistance of 100Ω; and resistor R5 with a resistance of 100Ω.

[0020] Furthermore, the activation indicator circuit includes a resistor R1 with a resistance value of 1KΩ; a light-emitting diode LD1, which is a red light-emitting diode; and an NPN transistor Q2, which is an FZT651TA.

[0021] Furthermore, the resistor R9 and the light-emitting diode LD2 in the activation completion indicator circuit are connected in series; the capacitor C1 and the two ends of the resistor R8 in the activation circuit are connected in parallel; the resistors R3, R4, and R5 in the activation circuit are connected in parallel; and the resistor R1 and the light-emitting diode LD1 in the activation completion indicator circuit are connected in series.

[0022] Compared with the prior art, this utility model has the following significant advantages:

[0023] 1. Improved ease of operation: Traditional professional lithium-thionyl chloride battery activation equipment is cumbersome to operate, requires professional knowledge and skills, and is bulky and inconvenient to carry, limiting its application in emergency or outdoor scenarios. This utility model features a simple activation circuit design, resulting in a compact and portable device suitable for various scenarios, enabling rapid activation of lithium-thionyl chloride batteries with convenient and flexible operation.

[0024] 2. Expanded Application Scenarios: Existing activation devices have limited functionality. This utility model's activation circuit is applicable to ordinary lithium-thionyl chloride batteries and lithium-thionyl chloride battery-powered devices, such as portable power supplies and outdoor exploration equipment. When the lithium-thionyl chloride battery in the device is passivated, there is no need to remove the battery; simply connecting this circuit allows for rapid activation, simplifying the maintenance process and extending the device's lifespan.

[0025] 3. Innovative Intelligent Activation Mechanism: Traditional activation devices are prone to repeated or unnecessary activation, wasting energy and damaging the battery. This utility model's activation circuit includes an innovative activation latching circuit, ensuring that the lithium-ion battery is activated only once upon power-on. Even when the battery level drops or there is a brief power outage, no additional activation actions are triggered. This intelligent control mechanism ensures safe and stable battery use.

[0026] 4. Cost-effectiveness considerations: Professional activation equipment is expensive and complex. The activation circuit and equipment of this utility model are low-cost, simple in design, and have low material, manufacturing and maintenance costs, making them affordable for users. They are also easy to integrate into various lithium-thionyl chloride battery power supply devices, providing manufacturers with a cost-effective solution and facilitating the promotion of lithium-thionyl chloride battery technology. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the automatic activation circuit structure of a single-cell lithium-ion battery as described in this utility model. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to specific embodiments and the accompanying drawings. It should be emphasized that the following description is merely exemplary and not intended to limit the scope or application of the present invention. The same reference numerals denote the same parts unless otherwise specified.

[0029] Example 1

[0030] Component designation Component meaning Component Specifications U1 Voltage detection chip SSP61CC3002MR R2 resistance 510R C2 capacitance 100nF

[0031] Component designation Component meaning Component Specifications U1 Voltage detection chip SSP61CC3002MR R9 resistance 20KΩ R11 resistance 4.7KΩ LD2 LED Green LED

[0032] Depend on Figure 1 The component designations, meanings, and specifications in the activation latch circuit are shown in the table below:

[0033] Component designation Component meaning Component Specifications R6 resistance 1KΩ R8 resistance 330Ω R10 resistance 1MΩ C1 capacitance 100nF Q2 NPN transistor FZT651TA R3 resistance 100Ω R4 resistance 100Ω R5 resistance 100Ω

[0034] Component designation Component meaning Component Specifications R1 resistance 1KΩ LD1 LED Red LED Q2 NPN transistor FZT651TA

[0035] The structure of the automatic activation circuit for a single lithium-ion battery is as follows: Figure 1 As shown, an automatic activation circuit for a single-cell lithium-ion battery includes a lithium-ion battery to be activated, a voltage detection circuit, an activation completion indicator circuit, an activation latch circuit, an activation circuit, and an activation indicator circuit. The lithium-ion battery to be activated is connected to the voltage detection circuit, the voltage detection circuit is connected to the activation completion indicator circuit, the activation completion indicator circuit is connected to the activation latch circuit, the activation latch circuit is connected to the activation circuit, and the activation circuit is connected to the activation indicator circuit.

[0036] The positive terminal of the lithium-ion battery to be activated is connected to one end of resistor R2, and the negative terminal is connected to ground.

[0037] The VIN pin of the voltage detection circuit U1 is connected to the positive terminal of the battery through resistor R2, the GND pin is connected to ground, and the other pins are connected to the activation circuit and the activation completion indicator circuit for control and signal transmission.

[0038] The activation completion indicator circuit has one end of resistor R9 connected to the relevant pin of U1 and the other end connected to the positive terminal of LED LD2 for current limiting; one end of resistor R11 is connected to the base of NPN transistor Q3 and the other end is connected to one end of current limiting resistor R9; the negative terminal of LD2 is connected to ground, and the activation completion indication is realized through the control signal of U1.

[0039] The drain of the NMOS transistor Q1 in the activation latch circuit is connected to the relevant components of the activation circuit via resistor R7, the source is connected to the base of the NPN transistor Q3, and the gate is connected to the relevant components of the activation indicator circuit, for latching the activation state; resistor R12 is connected between the source of NMOS transistor Q1 and ground, and resistor R7 is connected between the drain of NMOS transistor Q1 and the relevant components, for setting appropriate operating conditions; the base of NPN transistor Q3 is connected to the source of NMOS transistor Q1, the emitter is connected to ground, and the collector is connected to the relevant components, for auxiliary control.

[0040] In the activation circuit, one end of resistor R6 is connected to the power supply, and the other end is connected to the collector of NPN transistor Q3; one end of resistor R8 is connected to the collector of NPN transistor Q3, and the other end is connected to the base of NPN transistor Q2; one end of resistor R10 is connected to the base of NPN transistor Q3, and the other end is connected to ground; capacitor C1 is connected in parallel across resistor R8; resistors R3, R4, and R5 are connected in parallel, with one end connected to the power supply and the other end connected to the negative terminal of LD1.

[0041] The resistor R1 of the activation indicator circuit is connected to the power supply at one end and to the positive terminal of the light-emitting diode LD1 at the other end for current limiting; the negative terminal of LD1 is connected to the collector of the NPN transistor Q2, and the transistor controls the on / off state of the light-emitting diode; the base of the NPN transistor Q2 is connected to the relevant components of the activation circuit, and the emitter is connected to ground.

[0042] The activation principle of this utility model is as follows:

[0043] 1. After connecting the lithium-thionyl chloride battery to be activated, close switch S1. At this time, resistor R2 and capacitor C2 form an RC circuit to ensure that U1 is not accidentally triggered at the moment of power-on. Due to the passivation effect of the lithium-thionyl chloride battery, NPN transistor Q2 will conduct at the moment of power-on. At this time, the passivated battery is activated by discharging through resistors R3, R4, and R5, with a discharge current of approximately 100mA. Resistor R1 and red LED LD1 form an activation indicator circuit, which keeps LD1 lit during the activation process.

[0044] 2. Due to passivation, the battery voltage is very low at the beginning of activation. As activation progresses, the battery voltage gradually increases. When the battery voltage rises to approximately 3.5V, the voltage detection circuit U1 starts working. At this time, the VOUT pin of U1 outputs a high level, turning on NPN transistor Q3 and causing NPN transistor Q2 to turn off. Simultaneously, the activation indicator LD1 turns off, NMOS transistor Q1 starts working, and the activation completion indicator LD2 lights up.

[0045] 3. After the passivated battery is activated, the activation latch circuit remains operational. Even if the activated battery is left unremoved for an extended period, it will not re-enter the repeated activation state. Similarly, in scenarios where lithium-ion batteries are used, the battery will not re-enter the activation state due to voltage drops during use. If the inserted battery is not a passivated battery, the voltage detection circuit will start working after approximately 150ms due to the effect of resistor R2 and capacitor C2, thereby cutting off the activation circuit.

[0046] The foregoing has broadly described the features and technical advantages of this utility model in order to provide a better understanding of its detailed description. Other features and advantages of this utility model will be described below. Those skilled in the art will understand that the disclosed concepts and specific embodiments can be readily used as a basis for modifying or designing other structures to accomplish the same purpose of this utility model. Those skilled in the art will also recognize that such equivalent constructions do not depart from the spirit and scope of this utility model. The novel features considered characteristic of this utility model, its structure and method of operation, as well as further objects and advantages, will be better understood from the following description in conjunction with the accompanying drawings. However, it should be clearly understood that each feature provided is for description and illustration only and is not intended to limit the definition of this utility model.

Claims

1. An automatic activation circuit for a single-cell lithium-ion battery, characterized in that, It includes a lithium-ion battery to be activated, a voltage detection circuit, an activation completion indicator circuit, an activation latch circuit, an activation circuit, and an activation indicator circuit; the lithium-ion battery to be activated is connected to the voltage detection circuit, the voltage detection circuit is connected to the activation completion indicator circuit, the activation completion indicator circuit is connected to the activation latch circuit, the activation latch circuit is connected to the activation circuit, and the activation circuit is connected to the activation indicator circuit.

2. The automatic activation circuit for a single-cell lithium-ion battery according to claim 1, characterized in that, The voltage detection circuit includes a voltage detection chip U1, a resistor R2, and a capacitor C2.

3. The automatic activation circuit for a single-cell lithium-ion battery according to claim 1, characterized in that, The activation completion indication circuit includes a voltage detection chip U1; resistor R9; resistor R11; and light-emitting diode LD2.

4. The automatic activation circuit for a single-cell lithium-ion battery according to claim 3, characterized in that, The resistor R9 in the activation completion indicator circuit is connected in series with the light-emitting diode LD2.

5. The automatic activation circuit for a single-cell lithium-ion battery according to claim 1, characterized in that, The activation latch circuit includes an NMOS transistor Q1, a resistor R7, a resistor R12, and an NPN transistor Q3.

6. The automatic activation circuit for a single-cell lithium-ion battery according to claim 1, characterized in that, The activation circuit includes resistors R6, R8, and R10; capacitor C1; NPN transistor Q2; resistors R3, R4, and R5.

7. The automatic activation circuit for a single-cell lithium-ion battery according to claim 1, characterized in that, The capacitor C1 and resistor R8 in the activation circuit are connected in parallel.

8. The automatic activation circuit for a single-cell lithium-ion battery according to claim 6, characterized in that, The resistors R3, R4, and R5 in the activation circuit are connected in parallel.

9. The automatic activation circuit for a single-cell lithium-ion battery according to claim 1, characterized in that, The activation indicator circuit includes a resistor R1, a light-emitting diode LD1, and an NPN transistor Q2.

10. The automatic activation circuit for a single-cell lithium-ion battery according to claim 8, characterized in that, The resistor R1 in the activation completion indicator circuit is connected in series with the light-emitting diode LD1.

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