Battery pack over-temperature stop charging two suggestions and one warning circuit

Abstract

The application discloses a battery over-temperature stop-charging two-prompts-one-warning foolproof circuit, a plurality of normally closed temperature control switches which are attached to the surface of the battery are connected in series to form a multi-point temperature control normally closed loop, the multi-point temperature control normally closed loop is connected with a single battery over-temperature alarm circuit, when the temperature of a certain battery reaches the action value of the temperature control switch, the multi-point temperature control normally closed loop is disconnected, the single battery over-temperature alarm circuit will alarm and disconnect the charging circuit to stop charging, the multi-point temperature control normally closed loop is connected with a charger access prompt circuit and a charger pull-out prompt circuit, when the multi-point temperature control normally closed loop is closed, the charger access prompt circuit will play a prompt sound when the charger is connected, and the charger pull-out prompt circuit will play a prompt sound when the charger is pulled out, if the multi-point temperature control normally closed loop is disconnected or the single battery over-temperature alarm circuit is faulty, the charger access prompt circuit and the charger pull-out prompt circuit will not play normal sound, so that the user can know that the current charging is not safe.

Description

Technical Field

[0001] This invention relates to the field of battery charging technology and is a battery pack over-temperature charging stop circuit with two alerts and one warning to prevent mistaken charging. Background Technology

[0002] In the previously patented battery high-temperature alarm self-locking passive circuit, a normally open temperature control switch was attached to each individual cell of the battery pack.

[0003] When the battery temperature rises to the threshold of the temperature control switch, the switch closes, triggering the relay to stop charging and activating an audible and visual alarm.

[0004] This circuit effectively prevents thermal runaway caused by overcharging. It has the advantage of monitoring battery temperature without consuming power, and eliminates the need for complex data acquisition mechanisms.

[0005] Circuitry, computing circuitry, etc., can prevent battery thermal runaway at a very low cost. However, electric vehicles are ridden on complex road conditions, and battery assembly is more complex due to the...

[0006] This system is generally simple to manufacture and install. However, if a physical disconnection occurs in the temperature control switch circuit during use, or if the temperature control switch is activated due to a high battery temperature, there is no...

[0007] To address the issue of ineffective alarms due to circuit breaks, it is necessary to develop a closed-loop over-temperature stop-charging warning circuit that prevents circuit breaks.

[0008] Another requirement is that users need to periodically press the test button to check if the circuit is damaged. If the circuit is damaged, it will also fail to alarm.

[0009] This results in the loss of protection. To address this deficiency, the temperature control switch circuit is monitored when the user plugs in and unplugs the charger.

[0010] If everything is normal, an audible and visual signal will be emitted. If there is no signal, it indicates that the circuit is damaged and has lost its temperature protection. Charging at this time poses a safety hazard and should be stopped as soon as possible.

[0011] Troubleshooting. Summary of the Invention

[0012] In view of the problems existing in the prior art, this invention provides a battery pack over-temperature charging stop two-prompt-one-alarm foolproof circuit.

[0013] The main body consists of a multi-point temperature control normally closed circuit, a charging diode, a single-cell high-temperature alarm circuit, a charger connection indication circuit, and a charger unplug indication circuit.

[0014] Circuit, main charging relay, stop charging relay, alarm self-locking relay, DC-DC converter circuit, reset switch, test switch, fuse.

[0015] The path consists of optical couplers.

[0016] The aforementioned multi-point temperature control normally closed circuit uses a corresponding number of normally closed temperature control switches, one-to-one, based on the number of individual cells in the battery pack.

[0017] Each temperature control switch is individually attached to the surface of a single battery cell, with its leads connected in series with the next temperature control switch in sequence. The temperature control switches do not have...

[0018] When the operating temperature is reached, the circuit is in a closed state, therefore the two ends of the entire circuit are also in a short-circuit closed state. One end of the circuit is connected to the negative terminal of the battery through the fuse.

[0019] The other end is connected to the individual battery high-temperature alarm circuit, the charger connection indicator circuit, and the charger disconnection indicator circuit; any single battery...

[0020] The heat generated by the battery cell triggers the attached temperature control switch, changing it from normally closed to normally open. This also disconnects the closed bus, thereby triggering a high-temperature response in the individual battery cell.

[0021] The temperature alarm circuit sounds and stops charging. Simultaneously, the charger connection indicator circuit activates. When the charger is unplugged, the indicator circuit fails to emit an alarm sound, allowing the user to be aware of the situation.

[0022] The battery is in an unsafe charging state; the temperature control switch setting is less than or equal to the maximum safe operating temperature of the battery being applied, typically between 50-60 degrees Celsius.

[0023] Charging within this temperature range is safe and will not cause thermal runaway.

[0024] The main charging relay is a normally open circuit breaker, which, together with the charging diode, forms the battery charging circuit. The positive terminal of the diode is connected to...

[0025] The positive input terminal of the charger interface is connected, the negative terminal is connected to one contact of the main charging relay, and the other contact of the main charging relay is connected to the positive terminal of the battery.

[0026] The charger's negative terminal is directly connected to the battery's negative terminal. After the main charging relay closes, the charging current flows from the charger's positive terminal to the battery's positive terminal, but...

[0027] The current can flow from the positive terminal of the battery to the positive terminal of the charger. When the charger is not plugged into the port, the positive terminal of the diode is in a de-energized state, while when plugged in...

[0028] After the charger is connected, the positive terminal of the diode is charged.

[0029] The aforementioned high-temperature alarm circuit for a single battery, together with the aforementioned charge stop relay, alarm lock relay, and high-temperature audible and visual alarm, constitutes...

[0030] The battery pack's individual cell high-temperature charge stop alarm function utilizes a multi-point temperature control normally closed circuit as a trigger point. Upon a circuit break in this circuit, a signal is sent.

[0031] The main charging relay is activated to stop charging by disconnecting its coil circuit, and the alarm lock relay is activated to maintain the alarm.

[0032] The high temperature alarm in the pool triggered an alarm.

[0033] The charger insertion indication circuit, when the charger is plugged into the charging interface, is energized and sends a signal to the positive terminal of the optocoupler input.

[0034] The negative terminal of the optocoupler output is connected to the negative terminal of the circuit through a multi-point temperature-controlled normally closed loop. When the temperature-controlled loop is normally closed, the input terminal is conductive. Similarly, the optocoupler output...

[0035] Only after the output side is also connected can the connected voice circuit produce sound. After hearing the sound, the user knows that the temperature protection board is working normally and the battery temperature is within range.

[0036] This is also within the normal range. For example, if the normally closed circuit of the multi-point temperature control is open, or the optocoupler circuit cannot conduct and cannot play the connection prompt sound, it indicates that the battery is currently charging.

[0037] The insecurity is inherent.

[0038] The charger unplugging indication circuit, as described above, is energized and stores a certain amount of electrical energy after the charger is plugged into the charging interface, and indicates when the charger is unplugged.

[0039] After the charging interface, the stored electrical energy is used to send a signal to the optocoupler. The optocoupler is connected to the normally closed circuit of the multi-point temperature control switch, such as the multi-point temperature control switch.

[0040] When the normally closed circuit is properly closed, the optocoupler circuit will conduct and an audible prompt will sound. If the normally closed circuit of the multi-point temperature control switch is open, the optocoupler circuit will not conduct.

[0041] The system is unable to play the charging stop notification sound.

[0042] The reset switch and the test switch together constitute an alarm reset and test function. The reset switch is a normally closed switch, with one end...

[0043] One end is connected to the negative terminal of the circuit, and the other end is connected to a contact of the alarm lockout relay coil. Normally, it is closed and energized; when pressed, it is opened and de-energized. Test the switch.

[0044] It is a normally closed switch, with one end connected to the negative terminal of the circuit and the other end connected to a multi-temperature control switch circuit. Normally it is closed to provide power, and when pressed, it is closed to de-energize.

[0045] The aforementioned DC-DC converter circuit has its input terminal connected to the positive terminal of the battery via a fuse, and its negative terminal connected to the negative terminal of the circuit. The output terminal is divided into...

[0046] Connected to the following circuits: single-cell high-temperature alarm circuit, charging stop relay, alarm self-locking relay, charger connection indication circuit, and charger disconnection indication circuit.

[0047] The circuit includes voice prompts and a high-temperature battery alarm. This circuit provides a stable voltage for the aforementioned devices and reduces standby power consumption.

[0048] This ensures that the circuit has a wide operating voltage range to accommodate the voltage difference between a fully charged and a low-charged battery pack.

[0049] The aforementioned safety circuit consists of three components. One of them is connected in series to the positive terminal of the charger and to the charger connection indicator circuit, which indicates when the charger is unplugged.

[0050] Between the two circuits, one of the two circuits is connected in series between the positive terminal of the battery and the DC-DC conversion circuit, and the other of the two circuits is connected in series between the negative terminal of the battery and the negative terminal of this circuit.

[0051] There are two optocouplers in total. One input terminal is connected to the output terminal of the charger connection indicator circuit, and the other input terminal is connected to the charger unplugged circuit.

[0052] The output terminal of the indicator circuit is connected to the other input terminal of the optocoupler, which is simultaneously connected to the normally closed circuit of the multi-temperature control switch. The positive terminal of the output terminal is simultaneously connected to the DC-DC converter.

[0053] In this circuit, the negative terminal of the output is also connected to the negative terminal. Attached Figure Description

[0054] To more clearly illustrate the technical solutions in the embodiments of this invention, the following are the accompanying drawings used in the embodiments of this invention.

[0055] The following description is provided for clarity and convenience in illustrating some aspects of the technical solution of this invention.

[0056] For example, those skilled in the art can obtain other drawings from these drawings without any creative effort.

[0057] Figure 1. Explanation of the circuit structure for preventing battery pack overheating and charging stop with two alerts and one warning.

[0058] Figure 2. Flowchart illustrating the operation of the battery pack over-temperature charging stop circuit with two alerts and one warning.

[0059] Figure 3 shows the actual circuit diagram of the battery pack over-temperature charging stop two-prompt-one-alarm foolproof circuit.

[0060] Legend: 1. Multi-point temperature control normally closed circuit; 2. Charger interface; 3. Charging diode; 4. Individual battery over-temperature alarm.

[0061] Circuit 5, Charger connection indication circuit 6, Charger disconnection indication circuit 7, Main charging relay 8, Charging stop relay 9,

[0062] Alarm self-locking relay 10, battery high temperature audible and visual alarm 11, DC-DC converter circuit 12, reset switch 13, testing

[0063] Switch 14, fuse circuit 15, connected to audible and visual alarm 16, connected to audible and visual alarm 17, connected to battery pack.

[0064] 18. Isolation optocoupler. Detailed Implementation

[0065] Electric vehicles commonly use 48V battery packs. If 12V lead-acid batteries are used, only four temperature control switches are needed, employing ternary lithium batteries.

[0066] A lithium battery requires 13 cells, and therefore 13 temperature control switches. If the number of batteries increases, a corresponding number of temperature control switches will also be needed. Additionally, the circuit...

[0067] These parameters are adjusted to accommodate higher voltages, so it should be understood that the specific embodiments described herein are only for explaining the utility of this invention and are not intended to be used for practical purposes.

[0068] This invention is applicable to all applications.

[0069] In this embodiment, four temperature control switches form a multi-point temperature control normally closed loop 1, which is connected in series. In the initial state, the overall loop is closed.

[0070] One end of this circuit is connected to the negative terminal of this circuit, and the other end is connected to the single-cell over-temperature alarm circuit 4. The charger is connected to the indication circuit 5.

[0071] The appliance removal indication circuit 6 will trigger an alarm 4 in the single-cell over-temperature alarm circuit 4 when the normally closed circuit 1 of the multi-temperature control switch is opened, and will also drive the charging stop relay.

[0072] Electrical appliance 8, alarm lock relay 9, thus preventing charging; if the alarm circuit fails, the charger will not be alerted when connected to or unconnected from the circuit.

[0073] The test switch is connected in series to a multi-point temperature control normally closed circuit, which is normally on and off.

[0074] The main charging relay 7, charging diode 3, and stop charging relay 8 constitute a charging control circuit. The positive terminal of charging diode 3 is connected to the charging circuit.

[0075] Connect the positive input terminal of the electrical interface to the battery, connect the negative terminal to the normally open contact of the relay, connect the other normally open contact of the relay to the positive terminal of the battery, and connect the charger interface to the battery.

[0076] The negative terminal is directly connected to the negative terminal of the battery. After the charging relay is closed, the charging current flows from the positive terminal of the charger interface through the diode and the relay contacts.

[0077] The current flows to the positive terminal of the battery. Charging stops when the relay is disconnected. One end of the coil of the main charging relay is connected to the positive terminal of the charger interface.

[0078] The other end is connected to the contact of the charge stop relay, the other contact of the charge stop relay is connected to the negative terminal, and one end of the coil of the charge stop relay is connected to the DC-DC converter circuit.

[0079] 11 outputs the positive terminal, and the other end is connected to the collector of transistor Q3. After the battery over-temperature alarm circuit 4 is triggered, Q3 conducts, activating the charging stop relay coil.

[0080] When energized, the relay engages, the contacts open, the main charging relay coil is de-energized and disconnects, and charging terminates.

[0081] The single-cell over-temperature alarm circuit 4 mainly consists of transistor Q3, resistors R4 and R13, diodes D1 and D4.

[0082] The battery high-temperature audible and visual alarm LS3 consists of: the collector of transistor Q3, which is connected to the coil of charging stop relay 8 and alarm lockout relay 9.

[0083] The other end of the coil is connected to the positive output of the DC-DC converter circuit 11 after step-down; the base of Q3 is connected to the positive terminal of diode D1, and diode D1...

[0084] The negative terminal is connected to one end of the multi-point temperature control normally closed circuit, and the other end of the multi-point temperature control normally closed circuit is connected to the negative terminal of the battery. Simultaneously, it is connected to the negative terminal via resistor R4.

[0085] The positive terminal of the transistor Q3 is connected to the DC-DC converter circuit 11 via R13. Here, R4 and R13 provide a suitable bias voltage for the transistor Q3. (Battery)

[0086] The high-temperature audible and visual alarm LS3 has its positive terminal connected to the positive terminal of the DC-DC converter circuit, and its negative terminal connected to the collector of transistor Q3; the entire circuit...

[0087] Operating principle: The normally closed circuit of the multi-temperature control switch is closed under normal conditions, with zero resistance, short-circuiting the emitter and base voltage of Q3. Therefore, transistor Q3...

[0088] The circuit cannot conduct. When the battery temperature rises to the operating point of the temperature control switch, the temperature control switch changes from normally closed to normally open, and the emitter and base of Q3 are not connected.

[0089] When voltage is applied, Q3 conducts, energizing the charging stop relay coil. This causes the main charging relay to de-energize and stop charging, triggering an alarm and locking the relay coil.

[0090] When the coil is energized and engaged, the LS3 audible and visual alarm is also energized and sounds an alarm. The function of diode D1 is to, after the normally closed circuit of the multi-point temperature control is opened,

[0091] The current in the charger disconnection warning circuit 5 and charger disconnection warning circuit 6 flows to the negative terminal through transistor Q3, thus causing erroneous conduction.

[0092] The instruction indicates that the positive terminal of diode D4 is connected to the emitter of the transistor, and the negative terminal is connected to the negative terminal of the battery. Its function is to balance the voltage of Q3 after adding diode D1.

[0093] The base and emitter voltages.

[0094] The alarm lockout relay 9, reset switch 12, and test switch 13 constitute the alarm continuous lockout and testing mechanism of the alarm circuit.

[0095] The reset function synchronizes the alarm lock relay coil with the charge stop relay, with one end connected to the positive output of the DC-DC converter circuit 11, and the other end...

[0096] Connected to the collector of transistor Q3, after the battery over-temperature alarm circuit 3 is triggered, the coil is energized, and one end of the alarm lock relay contact is activated via a reset circuit.

[0097] The position switch is connected to the negative terminal, and the other end is connected to the collector of transistor Q3. After the alarm circuit is triggered, the charging relay stops, the alarm self-locking relay is activated, and there is an audible and visual alarm.

[0098] The current from the alarm does not need to flow through Q3; instead, it flows directly to the negative terminal through reset switch 12 until the reset switch is closed, de-energizing the relay coil.

[0099] Only after that will it return to its initial state; the test switch 13 is a normally closed switch, with one end connected to the negative terminal of the circuit and the other end connected in series to multiple terminals.

[0100] The temperature control switch circuit is normally closed and disconnected when switched off, which is equivalent to the disconnection of a multi-point temperature control normally closed circuit.

[0101] The charger is connected to a warning circuit consisting of resistors R6, R3, R7, transistor Q2, capacitor C2, optocoupler U3, and an audible and visual alarm.

[0102] The circuit LS1 is composed of resistors R6 and R3. One end of R3 is connected to the positive terminal of the charging diode through a fuse, and the other end of R3 is connected to the emitter of Q2. The other end of R6...

[0103] The transistor Q2 is connected to its base. Resistor R7 is connected at one end to the base of Q2 and at the other end to the negative terminal. Here, R6 and R7 provide appropriate bias voltage to transistor Q2.

[0104] The capacitor C2's positive terminal is connected to the base of Q2, and its negative terminal is connected to the circuit's negative terminal. The collector of transistor Q2 is connected to the positive input terminal of optocoupler U3.

[0105] The negative terminal of the input is connected to the negative terminal of the circuit through a multi-point temperature control normally closed loop, and the positive terminal of the optocoupler's output is connected to the positive output of DC-DC converter circuit 11.

[0106] Connect the input terminal of the audible and visual alarm to the positive terminal, and connect the output terminal of the audible and visual alarm to the negative terminal. When the charger is connected, due to the presence of C2, the base voltage of Q2 is pulled up.

[0107] When the temperature is low, Q2 is on, and the positive terminal of the U3 optocoupler input is energized. If the temperature control switch circuit is fully closed at this time, the optocoupler output is connected to the negative terminal.

[0108] The output is also conducting, and the audible and visual alarm is powered on and emits a warning alarm; over time, C2 charges through R6, and as the voltage increases, Q2 turns off to stop the light.

[0109] The output is coupled; changing the values ​​of the capacitor and resistor can change the conduction time.

[0110] The charger unplug warning circuit consists of resistors R1, R8, R9, transistor Q1, capacitor C1, optocoupler U2, and an audible and visual alarm.

[0111] The circuit consists of LS2. The base of transistor Q1 is connected to the positive terminal of the charging diode through resistor R9 and a fuse, and then connected to the circuit through resistor R8.

[0112] The negative terminal, where R9 and R8 provide a suitable bias voltage for transistor Q1 and Q3; the emitter of Q1 is connected to diode D3 through resistor R1.

[0113] The negative terminal of D3 is connected to the positive terminal of the charging diode through the fuse; the positive terminal of capacitor C1 is connected to the emitter of Q1, and the negative terminal is connected to the circuit's negative terminal.

[0114] The collector of Q1 is connected to the positive input terminal of the optocoupler. The negative input terminal of the optocoupler is connected to the negative terminal through a normally closed circuit of a multi-temperature control switch. The output of the optocoupler...

[0115] The positive terminal is connected to the positive output of DC-DC converter circuit 11, the negative terminal is connected to the input terminal of the audible and visual alarm, and the output terminal of the audible and visual alarm is connected to the negative terminal; charger

[0116] When connected, because the branch with resistor r1 has an additional resistor D3 compared to the branch with resistor R9, the emitter voltage of Q1 is lower than its base voltage, so Q1 cannot conduct.

[0117] At this time, C1 will store electrical energy through R1 and D3. After the charger is unplugged, the base of Q1 will lose voltage, and C1 will discharge to the base.

[0118] Thus, Q1 conducts, and the positive terminal of the optocoupler U3 is energized. If the temperature control switch circuit is closed at this time, the input terminal of the optocoupler is connected to the negative terminal, and the output terminal is the same.

[0119] When the circuit is turned on, the LS2 audible and visual alarm will be powered on and issue a warning alarm; the on-time can be changed by changing the values ​​of the capacitor and resistor.

[0120] The aforementioned fuse circuit has a total of 3 fuses, of which f1 is connected in series to the positive terminal of the charger and the charger is connected to the indicator circuit.

[0121] The circuit is connected between the disconnection indicator circuit and the DC-DC converter circuit; F2 is connected in series between the positive terminal of the battery and the DC-DC converter circuit; F3 is connected in series between the negative terminal of the battery and the DC-DC converter circuit.

[0122] The negative terminal of this circuit, acting as a fuse, disconnects the load and ensures the safety of the circuit in case of malfunction in this circuit, the battery, or the charger.

[0123] In standby mode without alarm, the standby current is less than 1mA. After an alarm is triggered, the current depends mainly on the power of the emitted sound and light, but generally will not exceed 100mA.

[0124] Therefore, a fuse with an ampere rating of 1A or less is sufficient.

[0125] The DC-DC converter circuit 11 has its input terminal connected to the positive terminal of the battery via fuse F2, and its output terminal supplies power to the alarm circuit.

[0126] The negative terminal is connected to the negative terminal of the battery via a fuse. In this example, if the voltage is 5V, then any battery pack with a voltage of 5V or higher can be used, depending on the DC-DC converter.

[0127] The input voltage of the chip is capped at 80V and can be used in many electric vehicles currently on the market.

[0128] The aforementioned audible and visual alarm has three circuits: a closed-loop alarm circuit LS3 and a charger connection indicator circuit.

[0129] LS1, Charger unplugging reminder circuit LS2.

[0130] The optocoupler 18 is located in the charger input circuit and the charger output circuit, and is connected to the output signal terminal of the circuit, and to the DC-DC converter.

[0131] The circuit with the lower voltage after the conversion circuit is stepped down forms electrical isolation to prevent voltage surges and reduce the failure rate.

[0132] The above-described embodiments are merely one relatively simple implementation of this invention and are not all embodiments. They should not be construed as exhaustive.

[0133] This should not be interpreted as a limitation on the scope of the patent application. Any person skilled in the art, within the scope of the technology disclosed in this utility model, may modify...

[0134] Changing the circuit parameters or replacing components, such as replacing the internal branch circuits with integrated chips, can achieve a similar cost-effective solution, especially in charging applications.

[0135] There are already hundreds of integrated chips, which can be easily replaced or modified according to the practical technical solution and concept of this new invention, but regardless of...

[0136] Any substitutions or alterations should be covered within the scope of protection of this utility model.

Claims

1. A battery pack over-temperature charging stop circuit with two alerts and one alarm, characterized in that, The main circuit comprises: a multi-point temperature control normally closed circuit, a charging diode, a single-cell over-temperature alarm circuit, a charger connection indication circuit, a charger disconnection indication circuit, a main charging relay, a charging stop relay, an alarm self-locking relay, a DC-DC conversion circuit, a reset switch, a test switch, a fuse circuit, and an optocoupler. The multi-point temperature control normally closed circuit is characterized by attaching the same number of normally closed temperature control switches, one-to-one, to the surface of each single cell, with each switch connected in series on its lead. The activation value of each temperature control switch is less than or equal to the maximum safe operating temperature of the cell to which it is attached. The single-cell over-temperature alarm circuit is characterized by using the multi-point temperature control normally closed circuit as a trigger point. When this circuit is broken, a signal is sent to drive the charging stop relay, disconnecting the coil circuit of the main charging relay to stop charging. Simultaneously, the alarm lock relay is activated for continuous alarm, and the battery high-temperature audible and visual alarm is activated. The charger... The connection prompt circuit is characterized in that, after the charger is connected to the charging interface, the circuit sends a signal to the optocoupler, which is then connected to a multi-point temperature control normally closed circuit. If the multi-point temperature control normally closed circuit is closed, the optocoupler circuit is conductive and a prompt sound can be played; if the multi-point temperature control normally closed circuit is open, the optocoupler circuit cannot conduct and the connection prompt sound cannot be played. The charger unplug prompt circuit is characterized in that, after the charger is connected to the charging interface, the circuit is energized and stores a certain amount of electrical energy. After the charger is unplugged from the charging interface, the stored electrical energy is used to send a signal to the optocoupler, which is connected to a multi-point temperature control normally closed circuit. If the multi-point temperature control normally closed circuit is closed, the optocoupler circuit is conductive and a unplug prompt sound can be played; if the multi-point temperature control normally closed circuit is open, the optocoupler circuit cannot conduct and the charging stop prompt sound cannot be played.

2. The battery pack over-temperature charging stop two-prompt-one-alarm foolproof circuit according to claim 1, characterized in that, The main charging relay is a normally open circuit breaker, forming a battery charging circuit together with the charging diode. The positive terminal of the diode is connected to the positive input terminal of the charger interface, and the negative terminal is connected to one contact of the main charging relay. The other contact of the main charging relay is connected to the positive terminal of the battery, and the negative terminal of the charger interface is directly connected to the negative terminal of the battery. After the main charging relay is closed, the charging current can flow from the positive terminal of the charger to the positive terminal of the battery, but cannot flow from the positive terminal of the battery to the positive terminal of the charger. When the charger interface is not plugged in, the diode... The positive terminal of the tube is in a state of no electricity.

3. The battery pack over-temperature charging stop two-prompt-one-alarm foolproof circuit according to claim 1, characterized in that, The reset switch and the test switch constitute an alarm reset and test function. The reset switch is a normally closed switch, with one end connected to the negative terminal of the battery and the other end connected to a contact of the alarm lock relay. It is normally closed and energized, and is de-energized when pressed. The test switch is a normally closed switch, connected in series in a multi-point temperature control normally closed circuit. It is normally closed and energized, and is de-energized when pressed.

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