Water inlet detection circuit

Abstract

The utility model discloses a water inlet detection circuit. The water inlet detection circuit comprises a waterproof detection terminal, a waterproof detection module, a switch module, an awakening module and a main control module. The switch module is connected between the waterproof detection terminal and the waterproof detection module; the waterproof detection module and the switch module are also connected with the main control module; the battery pack comprises a first electrode and a second electrode, the awakening module is connected with the first electrode or the second electrode of the battery pack, and the awakening module is connected with the main control module. According to the technical scheme provided by the embodiment of the utility model, the main control module controls the output loop of the battery pack to be disconnected according to the second water inlet signal, so that the current path between the first electrode and the second electrode of the battery pack is disconnected, and the electrolytic corrosion of the first electrode and the second electrode of the battery pack can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of battery waterproof detection, in particular to a water ingress detection circuit. Background Art

[0002] The battery pack is one of the core components of modern electric vehicles and portable electronic devices. Water entering the battery pack may cause safety issues such as battery damage, short circuit, and even fire or explosion.

[0003] Battery packs are usually used in various environmental conditions, including humid, rainy or water-contacted environments. Most battery packs on the market are not waterproof. When a battery pack falls into water, water is generally not completely pure and has a certain resistance. Electricity leaks or electrolysis occurs through the resistance of the water, causing electrolytic corrosion of the output contact terminals and output pins of the battery pack, affecting the performance and use of the battery pack and posing safety risks. Therefore, it is necessary to detect whether the battery pack has been flooded. Utility Model Content

[0004] The utility model provides a water ingress detection circuit to realize water ingress detection on a battery pack.

[0005] The utility model provides a water inlet detection circuit, which includes a waterproof detection terminal, a waterproof detection module, a switch module, a wake-up module and a main control module;

[0006] The switch module is connected between the waterproof detection terminal and the waterproof detection module; the waterproof detection module and the switch module are also connected to the main control module;

[0007] The battery pack includes a first electrode and a second electrode, the wake-up module is connected to the first electrode or the second electrode of the battery pack, the wake-up module is connected to the main control module, and the wake-up module is used to wake up the main control module according to a first water inflow signal of the first electrode or the second electrode;

[0008] The main control module is used to control the on or off of the switch module after being awakened; the waterproof detection module is used to detect whether water has entered the battery pack after the switch module is turned on, and output a second water inlet signal after water has entered the battery pack; the main control module is also used to control the output circuit of the battery pack to be disconnected according to the second water inlet signal.

[0009] Optionally, the waterproof detection module includes a voltage detection circuit, a voltage stabilizing circuit and a filtering circuit; the voltage detection circuit includes a first resistor, a second resistor and a third resistor; the voltage stabilizing circuit includes a voltage stabilizing diode;

[0010] The first end of the first resistor is connected to the first end of the main control module, the second end of the first resistor is respectively connected to the first end of the second resistor, the first pole of the voltage-regulating diode, and the first end of the third resistor, the second end of the second resistor is connected to the second end of the main control module, the first pole of the voltage-regulating diode is grounded, and the second end of the third resistor is connected to the filter circuit.

[0011] Optionally, the filtering circuit includes a fourth resistor and a first capacitor;

[0012] The first end of the fourth resistor is respectively connected to the first end of the first capacitor and the second end of the third resistor, the first end of the first capacitor is also connected to the switch module, and the second end of the fourth resistor and the second end of the first capacitor are both grounded.

[0013] Optionally, the switch module includes a first switch tube;

[0014] The control electrode of the first switch tube is connected to the third end of the main control module, the first electrode of the first switch tube is connected to the waterproof detection terminal, and the second electrode of the first switch tube is connected to the waterproof detection module.

[0015] Optionally, the water inlet detection circuit further includes a state indication module and a detection control module;

[0016] The state indication module is connected between the power supply and the main control module, and the detection control module is connected between the state indication module and the main control module;

[0017] The main control module is also used to control the state of the status indication module after receiving the detection signal output by the detection control module; the status indication module is used to indicate the water ingress status of the battery pack in response to the control signal of the main control module.

[0018] Optionally, the status indication module includes a first light emitting diode, a second light emitting diode and a third light emitting diode;

[0019] The first end of the first light-emitting diode, the first end of the second light-emitting diode, and the first end of the third light-emitting diode are all connected to the power line, the second end of the first light-emitting diode is connected to the fourth end of the main control module, the second end of the second light-emitting diode is connected to the fifth end of the main control module, and the second end of the third light-emitting diode is connected to the sixth end of the main control module.

[0020] Optionally, the detection control module includes a button; a first end of the button is connected to a power line and to a seventh end of the main control module, and a second end of the button is grounded.

[0021] Optionally, the wake-up module includes a second switch tube, a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor;

[0022] The control electrode of the second switch tube is connected to the first end of the fifth resistor, the second end of the fifth resistor is connected to the eighth end of the main control module, the first electrode of the second switch tube is connected to the first end of the sixth resistor, the second electrode of the second switch tube is connected to the first end of the seventh resistor and the first end of the eighth resistor, the second end of the sixth resistor is connected to the first electrode or the second electrode of the battery pack, the second end of the seventh resistor is connected to the ninth end of the main control module, and the second end of the eighth resistor is grounded.

[0023] Optionally, the waterproof detection terminal is arranged outside the battery pack, and the output circuit of the battery pack includes a discharge module; the discharge module is used to disconnect in response to the control signal output by the main control module according to the second water inlet signal on the waterproof detection terminal; the discharge module includes a third switch tube, and the third switch tube is connected in series between the first electrode and the second electrode of the battery pack.

[0024] Optionally, the circuit further includes a front-end detection module and a battery pack;

[0025] The battery pack and the third switch tube are connected in series and connected in series between the first electrode and the second electrode of the battery pack;

[0026] The front-end detection module is connected to each battery cell of the battery pack and to the control electrode of the third switch tube. The front-end detection module is used to detect the voltage of each battery cell and transmit it to the main control module.

[0027] The technical solution provided by the embodiment of the utility model is that the water inflow detection circuit is provided with a wake-up module, a switch module and a main control module, so that when water enters the battery pack, the first water inflow signal on the first electrode or the second electrode of the battery pack flows to the wake-up module, the wake-up module wakes up the control module after detecting the first water inflow signal, the control module controls the switch module to be turned on after responding to the wake-up signal, the waterproof detection module detects whether water enters the waterproof detection terminal through the switch module, and after detecting water inflow, the waterproof detection module outputs a second water inflow signal to the main control module, and the control module controls the switch module to be turned off after responding to the second water inflow signal, so that the waterproof detection terminal and the waterproof detection module are disconnected, that is, the current path between the waterproof detection terminal and the waterproof detection module is disconnected, which can avoid electrolytic corrosion of the waterproof detection terminal. The main control module controls the output circuit of the battery pack to be disconnected according to the second water inflow signal, so that the current path between the first electrode and the second electrode of the battery pack is disconnected, which can avoid electrolytic corrosion of the first electrode and the second electrode of the battery pack.

[0028] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present utility model, nor are they intended to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 A schematic diagram of the structure of a water inlet detection circuit provided by an embodiment of the utility model;

[0031] Figure 2 A schematic diagram of the structure of another water inlet detection circuit provided by an embodiment of the utility model;

[0032] Figure 3 A schematic diagram of the structure of another water inlet detection circuit provided by an embodiment of the utility model;

[0033] Figure 4 A schematic diagram of the structure of another water inlet detection circuit provided by an embodiment of the utility model;

[0034] Figure 5 A schematic diagram of the structure of another water inlet detection circuit provided by an embodiment of the utility model;

[0035] Figure 6 A schematic diagram of the structure of another water inlet detection circuit provided by an embodiment of the utility model;

[0036] Figure 7 A flow chart of a water ingress detection method provided by an embodiment of the utility model;

[0037] Figure 8 A flow chart of another water ingress detection method provided by an embodiment of the utility model;

[0038] Fig. 9 A flow chart of another water ingress detection method provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0040] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0041] Figure 1 A schematic diagram of a water inlet detection circuit provided by an embodiment of the utility model, referring to Figure 1 The water inlet detection circuit includes a waterproof detection terminal 1, a waterproof detection module 2, a switch module 3, a wake-up module 4 and a main control module 5; the switch module 3 is connected between the waterproof detection terminal 1 and the waterproof detection module 2; the waterproof detection module 2 and the switch module 3 are also connected to the main control module 5; the battery pack includes a first electrode and a second electrode, the wake-up module 4 is connected to the first electrode or the second electrode of the battery pack, the wake-up module 4 is connected to the main control module 5, and the wake-up module 4 is used to wake up the main control module 5 according to the first water inlet signal of the first electrode or the second electrode; the main control module 5 is used to control the conduction or shutdown of the switch module 3 after being awakened; the waterproof detection module 2 is used to detect whether the battery pack is water-infiltrated after the switch module 3 is turned on, and output a second water inlet signal after the battery pack is water-infiltrated; the main control module 5 is also used to control the output circuit of the battery pack to be disconnected according to the second water inlet signal.

[0042] Among them, the waterproof detection terminal 1 can extend to the outside of the battery pack through the plastic shell to detect whether the battery pack has water ingress. The second water ingress signal is generated on the waterproof detection terminal 1, and the second water ingress signal is input to the waterproof detection module 2; the first electrode and the second electrode of the battery pack are two terminals of the battery pack, that is, the first electrode of the battery pack is the positive terminal BAT+, and the second electrode is the negative terminal BAT-, or the first electrode of the battery pack is the negative terminal BAT-, and the second electrode is the positive terminal BAT+; the wake-up module is always connected to the negative terminal BAT- of the battery pack.

[0043] Optionally, the battery pack may be a lithium battery pack.

[0044] Specifically, under normal circumstances, that is, when the battery pack is not flooded and when the battery pack does not need to be discharged, the battery pack is in a dormant state to save energy, extend the battery life, and prevent the battery from being completely discharged and damaged; when the battery pack needs to be discharged, the positive terminal BAT+ and the negative terminal BAT- of the battery pack are connected to the load, and at this time the wake-up module 4 outputs a wake-up signal through the negative terminal BAT- of the battery pack via the voltage flowing into the battery pack, and then the main control module 5 responds to the wake-up signal to activate the battery pack, and the output circuit of the battery pack is opened, so that the battery pack can normally supply power to the load.

[0045] When water enters the battery pack, the positive terminal BAT+ and the negative terminal BAT- of the battery pack will generate a certain impedance due to the presence of water, so that the current of the positive terminal BAT+, that is, the first water inflow signal, flows to the negative terminal BAT- through the water circuit, and then flows to the wake-up module 4. The wake-up module 4 outputs a wake-up signal, and the main control module 5 activates the battery pack in response to the wake-up signal. The main control module 5 further outputs a control signal to control the switch module 3 to open, and the current of the positive terminal BAT+ flows to the negative terminal BAT- through the water circuit, and also flows to the waterproof detection terminal 1. The voltage on the waterproof detection terminal 1, that is, the second water inflow signal, is transmitted to the main control module 5 through the switch module 3 and the waterproof detection module 2. Therefore, the main control module 5 detects the voltage signal on the waterproof detection terminal 1 and turns off the switch module 3, and further outputs a control signal to disconnect the output circuit of the battery pack.

[0046] The technical solution provided by the embodiment of the utility model is that the water inflow detection circuit is provided with a wake-up module, a switch module 3 and a main control module 5, so that when water enters the battery pack, the first water inflow signal on the first electrode or the second electrode of the battery pack flows to the wake-up module 4, the wake-up module 4 wakes up the control module 5 after detecting the first water inflow signal, and the control module 5 controls the switch module 2 to be turned on in response to the wake-up signal, and the waterproof detection module 2 detects whether water enters the waterproof detection terminal 1 through the switch module 3, and after detecting water inflow, the waterproof detection module 2 outputs a second water inflow signal to the main control module 5, and the main control module 5 controls the switch module 3 to be turned off in response to the second water inflow signal, so that the waterproof detection terminal 1 and the waterproof detection module 2 are disconnected, that is, the current path between the waterproof detection terminal 1 and the waterproof detection module 2 is disconnected, which can avoid electrolytic corrosion of the waterproof detection terminal 1. Further, the main control module 5 controls the output circuit of the battery pack to be disconnected according to the second water inflow signal, so that the current path between the first electrode and the second electrode of the battery pack is disconnected, which can avoid electrolytic corrosion of the first electrode and the second electrode of the battery pack.

[0047] Optionally, in other embodiments, the waterproof detection terminal 1 can also be set as a corresponding metal terminal inside the battery pack, which is used to determine whether water has entered the battery pack by detecting whether a voltage signal is generated on the waterproof detection terminal 1 inside the battery pack.

[0048] Figure 2 A schematic diagram of another water inlet detection circuit provided by an embodiment of the utility model, referring to Figure 2 On the basis of the above embodiment, the waterproof detection module 2 includes a voltage detection circuit 21, a voltage stabilizing circuit 22 and a filtering circuit 23; the voltage detection circuit 21 includes a first resistor R1, a second resistor R2 and a third resistor R3; the voltage stabilizing circuit 22 includes a voltage stabilizing diode ZD1; the filtering circuit 23 includes a fourth resistor R4 and a first capacitor C1; the first end of the first resistor R1 is connected to the first end 51 of the main control module 5, the second end of the first resistor R1 is respectively connected to the first end of the second resistor R2, the first pole of the voltage stabilizing diode ZD1, and the first end of the third resistor R3, the second end of the second resistor R2 is connected to the second end 52 of the main control module 5, the second pole of the voltage stabilizing diode ZD1 is grounded, the second end of the third resistor R3 is respectively connected to the first end of the fourth resistor R4 and the first end of the first capacitor C1, the first end of the first capacitor C1 is also connected to the switch module 3, and the second end of the fourth resistor R4 and the second end of the first capacitor C1 are both grounded.

[0049] The first resistor R1 , the second resistor R2 and the third resistor R3 are used to detect the voltage in the loop; the voltage regulator diode ZD1 is used to provide a stable voltage to other circuits.

[0050] Optionally, the waterproof detection module 2 further includes a second capacitor C2.

[0051] The second capacitor C2 is used for filtering.

[0052] Specifically, when the battery pack is flooded, the wake-up module 4 wakes up the main control module 5 after receiving the first water inflow signal from the negative terminal BAT-, and then the main control module 5 controls the switch module 3 to turn on. Therefore, the current of the positive terminal BAT+ flows to the negative terminal BAT- through the water circuit, and then flows to the waterproof detection terminal 1. The voltage on the waterproof detection terminal 1, that is, the second water inflow signal, flows to the first end 51 of the main control module 5 through the switch module 3, the third resistor R3 and the first resistor R1, and flows to the second end 52 of the main control module 5 through the switch module 3, the third resistor R3 and the second resistor R2. Therefore, when the battery pack is flooded, the main control module 5 can detect voltage signals at the first end 51 and the second end 52 at the same time. At this time, the main control module 5 no longer responds to the wake-up signal of the wake-up module 4, and then turns off the output circuit of the switch module 4 and the battery pack. At the same time, due to the presence of the fourth resistor R4, the first capacitor C1 and the voltage-stabilizing diode ZD1, the voltage input to the main control module 5 can be filtered and stabilized, further protecting the main control module 5 and other components in the circuit.

[0053] The technical solution provided in this embodiment is to set up a voltage detection circuit 21, a voltage stabilizing circuit 22 and a filtering circuit 23, and the voltage detection circuit 21 is respectively connected to the first end 51 and the second end 52 of the main control module 5, so that when the battery pack is flooded, the main control module 5 can detect voltage signals on two pins at the same time, and then control the switch module 3 to disconnect, which can ensure the accuracy and reliability of water ingress detection of the main control module 5. At the same time, since the voltage stabilizing circuit 22 and the filtering circuit 23 are set up, the voltage flowing into the main control module 5 is filtered and stabilized, which can ensure that the main control module 5 will not be damaged due to excessive input voltage.

[0054] Of course, in other embodiments, the waterproof detection module 2 may include a waterproof detection sensor, which is used to cause the circuit parameters of the waterproof detection sensor to change after detecting water ingress into the waterproof detection terminal 1 or water ingress into the battery pack, and then output a corresponding signal indicating that water has entered the battery pack, wherein the circuit parameters at least include a voltage signal; or the waterproof detection module 2 may include a pressure sensor, which is used to cause the circuit parameters of the internal circuit of the pressure sensor to change after detecting water ingress into the waterproof detection terminal 1 or water ingress into the battery pack, thereby indicating that water has entered the battery pack, wherein the circuit parameters at least include a resistance change signal.

[0055] Figure 3 A schematic diagram of another water inlet detection circuit provided by an embodiment of the utility model, referring to Figure 3On the basis of the above embodiments, the switch module 4 includes a first switch tube MOS1; the control electrode of the first switch tube MOS1 is connected to the third end 53 of the main control module 5, the first electrode of the first switch tube MOS1 is connected to the waterproof detection terminal 1, and the second electrode of the first switch tube MOS1 is connected to the waterproof detection module 2.

[0056] The first switch tube MOS1 is used to be turned on when the third terminal 53 of the main control module 5 outputs a high level, and turned off when the third terminal 53 of the main control module 5 outputs a low level. Alternatively, the first switch tube MOS1 is turned off when the third terminal 53 of the main control module 5 outputs a high level, and turned on when the third terminal 53 of the main control module 5 outputs a low level.

[0057] Optionally, the second electrode of the first switch tube MOS1 is connected to the first end of the first capacitor C1.

[0058] Optionally, the switch module 4 further includes a ninth resistor R9 , a first end of the ninth resistor R9 is connected to the control electrode of the first switch tube MOS1 , and a second end of the ninth resistor R9 is connected to the third end 53 of the main control module 5 .

[0059] The ninth resistor R9 is used for current limiting.

[0060] Exemplarily, when the battery pack is operating normally, the voltage on the third terminal 53 of the main control module 5 outputs a high level, controls the first switch tube MOS1 to be turned on, and the switch module 4 is in a conducting state, and the battery pack can be charged. When the battery pack is flooded, the first terminal 51 and the second terminal 52 of the main control module 5 simultaneously detect a voltage signal. At this time, the voltage on the third terminal 53 of the main control module 5 outputs a low level, controls the first switch tube MOS1 to be turned off, and then the switch module 4 is in a turned-off state so that the circuit where the waterproof detection terminal 1 is located is disconnected. It can avoid electrolytic corrosion of the waterproof detection terminal 1 due to the presence of external water, thereby extending the service life of the battery pack and improving safety.

[0061] Figure 4 A schematic diagram of another water inlet detection circuit provided by an embodiment of the utility model, referring to Figure 4 On the basis of the above embodiments, it also includes a status indication module 6 and a detection control module 7; the status indication module 6 is connected between the power supply VCC and the main control module 5, and the detection control module 7 is connected between the status indication module 6 and the main control module 5; the main control module 5 is also used to control the state of the status indication module 6 after receiving the detection signal output by the detection control module 7; the status indication module 6 is used to respond to the control signal of the main control module 5 to indicate the water ingress status of the battery pack.

[0062] Specifically, when water enters the battery pack, the detection control module 7 is controlled to output a detection signal, and then the main control module 5 responds to the detection signal and outputs a control signal to control the state of the state indication module 6, and the state indication module 6 is observed to determine whether there is still water on the battery pack. Exemplarily, the state indication module 6 may include at least a first state and a second state, which are used to indicate the water ingress state of the battery pack. For example, the first state may be a flashing state of an LED light, which is used to indicate that there is water on the battery pack, and the second state may be a state where the LED light is always on, which is used to indicate that there is no water on the battery pack. When water enters the battery pack, it is necessary to remove the water on the battery pack, such as manually drying the water on the battery pack. At this time, the detection control module 7 is controlled to output a detection signal, and then the main control module 5 responds to the detection signal and outputs a control signal to control the state of the state indication module 6, and then indicates whether there is residual water in the battery pack. If the control signal output by the main control module 5 causes the state indication module 6 to be in a flashing state of the LED light, it indicates that there is still residual water at the output terminal of the battery pack; if the control signal output by the main control module 5 causes the state indication module 6 to be in a state where the LED light is always on, it indicates that there is no residual water at the output terminal of the battery pack.

[0063] The technical solution provided in this embodiment, by setting the status indication module 6 and the detection control module 7, can simply and conveniently observe whether there is residual water at the output terminal after the battery pack has been flooded and dewatered.

[0064] Continue to refer Figure 4 Optionally, the status indication module 6 includes a first light-emitting diode LED1, a second light-emitting diode LED2 and a third light-emitting diode LED3; the detection control module 7 includes a button S1; the first pole of the first light-emitting diode LED1, the first pole of the second light-emitting diode LED2, the first pole of the third light-emitting diode LED3 and the first end of the button S1 are all connected to the power supply VCC, the first end of the button S1 is also connected to the seventh end 57 of the main control module 5, the second end of the button S1 is grounded, the second pole of the first light-emitting diode LED1 is connected to the fourth end 54 of the main control module 5, the second pole of the second light-emitting diode LED2 is connected to the fifth end 55 of the main control module 5, and the second pole of the third light-emitting diode LED3 is connected to the sixth end 56 of the main control module 5.

[0065] The button S1 is used to output a detection signal, and the first light emitting diode LED1, the second light emitting diode LED2 and the third light emitting diode LED3 are used to indicate whether there is residual water at the output terminal of the battery pack through different light emitting states.

[0066] Optionally, the status indication module 6 also includes a tenth resistor R10, an eleventh resistor R11 and a twelfth resistor R12, the first end of the tenth resistor R10, the first end of the eleventh resistor R11 and the first end of the twelfth resistor R12 are all connected to the power supply VCC, the second end of the tenth resistor R10 is connected to the first pole of the first light-emitting diode LED1, the second end of the eleventh resistor R11 is connected to the first pole of the second light-emitting diode LED2, and the second end of the twelfth resistor R12 is connected to the first pole of the third light-emitting diode LED3; the detection control module 7 also includes a thirteenth resistor R13 and a third capacitor C3, the first end of the thirteenth resistor R13 is connected to the power supply VCC, the second end of the thirteenth resistor R13 is respectively connected to the first end of the button S1, the first end of the third capacitor C3, and the seventh end 57 of the main control module 5, and the second end of the third capacitor C3 is grounded.

[0067] The tenth resistor R10, the eleventh resistor R11 and the twelfth resistor R12 are used for current limiting, and the third capacitor C3 is used for filtering.

[0068] Specifically, when the battery pack is flooded, the battery pack is taken out of the water, and the water remaining on the battery pack needs to be shaken off by hand. At this time, the button S1 is pressed, and after the seventh terminal 57 of the main control module 5 responds to the detection signal output by the button S1, the fourth terminal 54, the fifth terminal 55 and the sixth terminal 56 of the main control module 5 output control signals to make the first light-emitting diode LED1, the second light-emitting diode LED2 and the third light-emitting diode LED3 emit light, and it is judged whether there is residual water at the output terminal of the battery pack according to the different light-emitting states. Exemplarily, when the button S1 is pressed, if the control signal output by the main control module 5 makes the first light-emitting diode LED1, the second light-emitting diode LED2 and the third light-emitting diode LED3 emit light in a flashing state, it indicates that there is residual water at the output terminal of the battery pack; if the control signal output by the main control module 5 makes the first light-emitting diode LED1, the second light-emitting diode LED2 and the third light-emitting diode LED3 emit light in a constant light state, it indicates that there is no residual water at the output terminal of the battery pack.

[0069] The technical solution provided in this embodiment allows the user to intuitively judge whether there is any residual water in the output terminal of the battery pack through the different lighting states of the first light-emitting diode LED1, the second light-emitting diode LED2 and the third light-emitting diode LED3, thereby avoiding short circuit of the battery pack due to corrosion caused by water ingress and avoiding the risk of heating and fire in the battery pack.

[0070] Figure 5 A schematic diagram of another water inlet detection circuit provided by an embodiment of the utility model, referring to Figure 5On the basis of the above embodiments, the wake-up module 4 includes a second switch tube MOS2, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8; the control electrode of the second switch tube MOS2 is connected to the first end of the fifth resistor R5, the second end of the fifth resistor R5 is connected to the eighth end 58 of the main control module 5, the first electrode of the second switch tube MOS2 is connected to the first end of the sixth resistor R6, the second electrode of the second switch tube MOS2 is connected to the first end of the seventh resistor R7 and the first end of the eighth resistor R8, the second end of the sixth resistor R6 is connected to the first electrode or the second electrode of the battery pack, the second end of the seventh resistor R7 is connected to the ninth end 59 of the main control module 5, and the second end of the eighth resistor R8 is grounded.

[0071] Among them, the second switch tube MOS2 is used to transmit the current of the negative terminal BAT- to the main control module 5 when it is turned on, the fifth resistor R5 is used to be voltage-regulated by the main control module 5 to control the conduction and cutoff of the second switch tube MOS2, and the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 are used for current limiting.

[0072] Optionally, the wake-up module 4 further includes a fourth capacitor C4, a first end of the fourth capacitor C4 is connected to the ninth end 59 of the main control module 5, and a second end of the fourth capacitor C4 is grounded.

[0073] The fourth capacitor C4 is used for filtering.

[0074] Specifically, when the second switch tube MOS2 is turned on, the current on the negative terminal BAT- of the battery pack is input to the ninth terminal 59 of the main control module 5 through the sixth resistor R6, the second switch tube MOS2 and the seventh resistor R7, thereby waking up the main control module 5. By waking up the main control module 5 when the second switch tube MOS2 is turned on, the availability and flexibility of the device can be improved, and through this setting, power is consumed only when the main control module 5 needs to be woken up, avoiding unnecessary energy waste.

[0075] Figure 6 A schematic diagram of another water inlet detection circuit provided by an embodiment of the utility model, referring to Figure 6 On the basis of the above embodiments, the waterproof detection terminal 1 is arranged outside the battery pack, and the output circuit of the battery pack includes a discharge module 8; the circuit also includes a front-end detection module 9 and a battery pack 10; the discharge module 8 includes a third switch tube MOS3; the battery pack 10 and the third switch tube MOS3 are connected in series and connected in series between the first electrode and the second electrode of the battery pack; the front-end detection module 9 is connected to each battery cell unit of the battery pack 10 and is connected to the control electrode of the third switch tube MOS3; the discharge module 8 is used to disconnect in response to the control signal output by the main control module 5 according to the second water inlet signal on the waterproof detection terminal 1; the front-end detection module 9 is used to detect the voltage of each battery cell and transmit it to the main control module 5.

[0076] Among them, the third switch tube MOS3 is used to make the battery pack discharge normally when it is turned on, and prohibit the battery pack from discharging when it is turned off; the battery pack includes a plurality of battery cells, and the plurality of battery cells are connected in series. For example, the battery pack includes five battery cells, namely a first battery cell 101, a second battery cell 102, a third battery cell 103, a fourth battery cell 104 and a fifth battery cell 105, and the five battery cells are connected in series.

[0077] Optionally, the water inlet detection circuit also includes a nineteenth resistor R19.

[0078] The nineteenth resistor R19 is used for current limiting.

[0079] Optionally, the first battery cell unit 101 includes a fourteenth resistor R14, a fifth capacitor C5 and a first battery cell CL1, the second battery cell unit 102 includes a fifteenth resistor R15, a sixth capacitor C6 and a second battery cell CL2, the third battery cell unit 103 includes a sixteenth resistor R16, a seventh capacitor C7 and a third battery cell CL3, the fourth battery cell unit 104 includes a seventeenth resistor R17, an eighth capacitor C8 and a fourth battery cell CL4, and the fifth battery cell unit 105 includes an eighteenth resistor R18, a ninth capacitor C9 and a fifth battery cell CL5; the first end of the fourteenth resistor R14 is connected to the first end of the fifth capacitor C5 and to the seventh end 97 of the front-end detection module 9, and the second end of the fourteenth resistor R14 is connected to the first end of the fifth capacitor C5 and to the seventh end 97 of the front-end detection module 9. The first end of the fifteenth resistor R15 is connected to the first end of the sixth capacitor C6 and is connected to the fifth end 95 of the front-end detection module 9. The second end of the fifteenth resistor R15 is connected to the positive electrode of the second battery cell CL2, and the negative electrode of the second battery cell CL2 is respectively connected to the second end of the fourteenth resistor R14 and the positive electrode of the first battery cell CL1. The second end of the sixth capacitor C6 is respectively connected to the first end of the fourteenth resistor R14 and the first end of the fifth capacitor C5, and is connected to the sixth end 96 of the front-end detection module 9. The first end of the sixteenth resistor R16 is connected to the first end of the seventh capacitor C7 and is connected to the The fourth end 94 of the front-end detection module 9 is connected, the second end of the sixteenth resistor R16 is connected to the positive electrode of the third battery cell CL3, the negative electrode of the third battery cell CL3 is respectively connected to the second end of the fifteenth resistor R15 and the positive electrode of the second battery cell CL2, the second end of the seventh capacitor C7 is respectively connected to the first end of the fifteenth resistor R15 and the first end of the sixth capacitor C6, and is connected to the fifth end 95 of the front-end detection module 9; the first end of the seventeenth resistor R17 is connected to the first end of the eighth capacitor C8, and is connected to the third end 93 of the front-end detection module 9, the second end of the seventeenth resistor R17 is connected to the positive electrode of the fourth battery cell CL4, the negative electrode of the fourth battery cell CL4 is respectively connected to the second end of the sixteenth resistor R16 and the first end of the sixth capacitor C6, and is connected to the fifth end 95 of the front-end detection module 9; The positive electrode of the third battery cell CL3 is connected, the second end of the eighth capacitor C8 is respectively connected to the first end of the sixteenth resistor R16 and the first end of the seventh capacitor C7, and is connected to the fourth end 94 of the front-end detection module 9; the first end of the eighteenth resistor R18 is connected to the first end of the ninth capacitor C9, and is connected to the second end 92 of the front-end detection module 9, the second end of the eighteenth resistor R18 is connected to the positive electrode of the fifth battery cell CL5, the negative electrode of the fifth battery cell CL5 is respectively connected to the second end of the seventeenth resistor R17 and the positive electrode of the fourth battery cell CL4, the second end of the ninth capacitor C9 is respectively connected to the first end of the seventeenth resistor R17 and the first end of the eighth capacitor C8, and is connected to the third end 93 of the front-end detection module 9;

[0080] Optionally, the water inlet detection circuit also includes a tenth capacitor C10 and a second voltage-stabilizing tube ZD2; the first end of the tenth capacitor C10 is respectively connected to the second end 92 of the front-end detection module 9, the first pole of the second voltage-stabilizing tube ZD2, the first end of the ninth capacitor C9, and the first end of the eighteenth resistor R18, and the second end of the tenth capacitor C10 and the second pole of the second voltage-stabilizing tube ZD2 are grounded.

[0081] The tenth capacitor C10 is used for filtering, and the second voltage regulator ZD2 is used for voltage stabilization.

[0082] Optionally, the water inlet detection circuit also includes a twentieth resistor R20, an eleventh capacitor C11, a twelfth capacitor C12 and a diode D1. The first end of the twelfth capacitor C12 is respectively connected to the first end 91 of the front-end detection module 9, the first end of the eleventh capacitor C11 and the first end of the twentieth resistor R20, the second end of the twelfth capacitor C12 and the second end of the eleventh capacitor C11 are both grounded, the second end of the twentieth resistor R20 is connected to the first pole of the diode D1, the second pole of the diode D1 is connected to the first end of the anti-static wiring T, and the second end of the anti-static wiring T is connected to the positive terminal BAT+ of the battery pack.

[0083] The eleventh capacitor C11 and the twelfth capacitor C12 are used for filtering, the twentieth resistor R20 is used for current limiting, and the diode D1 is used for reverse connection prevention.

[0084] Optionally, the water inlet detection circuit also includes a twenty-first resistor R21 and a twenty-second resistor R22, the first end of the twenty-first resistor R21 is connected to the eighth end 98 of the front-end detection module 9, the second end of the twenty-first resistor R21 is connected to the first end of the twenty-second resistor R22, and is connected to the control electrode of the third switch tube MOS3, and the second end of the twenty-second resistor R22 is connected to the second electrode of the third switch tube MOS3.

[0085] The twenty-first resistor R21 and the twenty-second resistor R22 are used for current limiting.

[0086] Optionally, the water inlet detection circuit further includes a temperature detection module 11 , and the temperature detection module 11 includes three temperature detection units, namely a first temperature detection unit 111 , a second temperature detection unit 112 and a third temperature detection unit 113 .

[0087] The first temperature detection unit 111 is used to detect the temperature of the battery cell of the battery pack 10, the second temperature detection unit 112 is used to detect the temperature of the third switch tube MOS3, and the third temperature detection unit 113 is used to detect the temperature of the battery cell assembly positive CL5+.

[0088] Optionally, the first temperature detection unit 111 includes a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28 and an eighteenth capacitor C18, the second temperature detection unit 112 includes a twenty-ninth resistor R29, a thirtieth resistor R30, a thirty-first resistor R31 and a nineteenth capacitor C19, and the third temperature detection unit 113 includes a thirty-second resistor R32, a thirty-third resistor R33, a thirty-fourth resistor R34 and a twenty-fourth capacitor C20; the first end of the twenty-eighth resistor R28, the first end of the thirty-first resistor R31 and the first end of the thirty-fourth resistor R34 are all connected to the first power supply Vout, the first end of the twenty-sixth resistor R26 is respectively connected to the second end of the twenty-eighth resistor R28 and the first end of the twenty-seventh resistor R27, the second end of the twenty-sixth resistor R26 is connected to the twenty-seventh end 77 of the main control module 5, and The first end of the twenty-ninth resistor R29 is connected to the second end of the thirty-first resistor R31 and the first end of the thirtieth resistor R30, respectively, the second end of the twenty-ninth resistor R29 is connected to the twenty-eighth terminal 78 of the main control module 5, and is connected to the first end of the nineteenth capacitor C19, and the second end of the thirtieth resistor R30 and the second end of the nineteenth capacitor C19 are both grounded; the first end of the thirty-second resistor R32 is connected to the second end of the thirty-fourth resistor R34 and the first end of the thirty-third resistor R33, respectively, the second end of the thirty-second resistor R32 is connected to the twenty-ninth terminal 79 of the main control module 5, and is connected to the first end of the twentieth capacitor C20, and the second end of the thirty-third resistor R33 and the second end of the twentieth capacitor C20 are both grounded.

[0089] Among them, the first power supply Vout is used for power supply; the twenty-sixth resistor R26, the twenty-seventh resistor R27, the twenty-eighth resistor R28, the twenty-ninth resistor R29, the thirtieth resistor R30, the thirty-first resistor R31, the thirty-second resistor R32, the thirty-third resistor R33 and the thirty-fourth resistor R34 are used for current limiting; the eighteenth capacitor C18, the nineteenth capacitor C19 and the twentieth capacitor C20 are used for filtering.

[0090] Optionally, the water inlet detection circuit also includes an overcurrent protection module 12, which includes a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a thirteenth capacitor C13 and a fourteenth capacitor C14; the first end of the twenty-third resistor R23 is connected to the first end of the fourteenth capacitor C14, and is connected to the twenty-fifth end 75 of the main control module 5, the second end of the twenty-third resistor R23 is respectively connected to the second end of the fourteenth capacitor C14, the twenty-sixth end 76 of the main control module 5 and the first end of the twenty-fifth resistor R25, the second end of the twenty-fifth resistor R25 is connected to the second end of the fifth capacitor C5, the first end of the twenty-fourth resistor R24 ​​is respectively connected to the twenty-fourth end 74 of the main control module 5, the first end of the thirteenth capacitor C13 and the first end of the twenty-sixth resistor R26, the second end of the twenty-fourth resistor R24 ​​is connected to the second power supply VCur, the second end of the thirteenth capacitor C13 is grounded, and the second end of the twenty-sixth resistor R26 is connected to the second end of the nineteenth resistor R19.

[0091] The overcurrent protection module 12 is used to protect the battery pack when the first electrode and the second electrode are short-circuited. The twenty-third resistor R23 and the fourteenth capacitor C14 are used for current sampling; the twenty-fourth resistor R24, the twenty-fifth resistor R25 and the twenty-sixth resistor R26 are used for current limiting, and the thirteenth capacitor C13 is used for filtering.

[0092] Optionally, the water inlet detection circuit also includes a communication module 13, the communication module 13 includes a thirty-fifth resistor R35, a thirty-sixth resistor R36 and a fourth switch tube MOS4; the first end of the thirty-fifth resistor R35 is connected to the second end of the first resistor R1, the second end of the thirty-fifth resistor R35 is connected to the control electrode of the fourth switch tube MOS4, the first end of the thirty-sixth resistor R36 is connected to the power supply VCC, the second end of the thirty-sixth resistor R36 is connected to the first electrode of the fourth switch tube MOS4, and is connected to the thirtieth end 80 of the main control module 5, and the second electrode of the fourth switch tube MOS4 is grounded.

[0093] The communication module 13 is used to transmit parameters such as the voltage, temperature and overcurrent of the battery pack. The thirty-fifth resistor R35 and the thirty-sixth resistor R36 are used for current limiting, the fourth switch tube MOS4 is used to be turned on when the thirty-fifth resistor R35 is at a high level, and to make the 30th terminal 80 of the main control module 5 output a low level signal, and the fourth switch tube MOS4 is used to be turned off when the thirty-fifth resistor R35 is at a low level, and to make the 30th terminal 80 of the main control module 5 output a high level signal.

[0094] Optionally, the water inlet detection circuit also includes a burning module 14, which includes a terminal block CN1, a thirty-seventh resistor R37 and a twenty-first capacitor C21; the first end of the terminal block CN1 is connected to the power supply VCC, the second end is connected to the twelfth end 62 of the main control module 5, the third end is connected to the eleventh end 61 of the main control module 5, the fourth end is connected to the tenth end 60 of the main control module 5, and is connected to the second end of the thirty-seventh resistor R37 and the first end of the twenty-first capacitor C21, the fifth end is grounded, the first end of the thirty-seventh resistor R37 is connected to the power supply VCC, and the second end of the twenty-first capacitor C21 is grounded.

[0095] The burning module 14 is used for burning the program, and the thirty-seventh resistor R37 and the twenty-first capacitor C21 are used for resetting.

[0096] Optionally, the water inlet detection circuit also includes a thirty-eighth resistor R38, a twenty-second capacitor C22 and a twenty-third capacitor C23; the first end of the thirty-eighth resistor R38 is respectively connected to the thirteenth terminal 63 of the main control module 5, the power supply VCC and the first end of the twenty-second capacitor C22, the second end of the thirty-eighth resistor R38 is connected to the first end of the twenty-third capacitor C23, and is connected to the ninth terminal 99 of the front-end detection module 9, the first end of the twenty-second capacitor C22 is connected to the fourteenth terminal 64 of the main control module 5 and is grounded, and the second end of the twenty-third capacitor C23 is grounded.

[0097] The thirty-eighth resistor R38 is used for current limiting, and the twenty-second capacitor C22 and the twenty-third capacitor C23 are used for filtering.

[0098] Optionally, the water inlet detection circuit also includes a thirty-ninth resistor R39 and a twenty-fourth capacitor C24, the first end of the thirty-ninth resistor R39 is connected to the twenty-second end 72 of the main control module 5, and is connected to the first end of the twenty-fourth capacitor C24, the second end of the thirty-ninth resistor R39 is connected to the seventeenth end 107 of the front-end detection module 9, and the second end of the twenty-fourth capacitor C24 is grounded.

[0099] Among them, the thirty-ninth resistor R39 is used for current limiting, and the twenty-fourth capacitor C24 is used for filtering.

[0100] Optionally, the fifteenth end 65 of the main control module 5 is connected to the tenth end 100 of the front-end detection module 9, the sixteenth end 66 of the main control module 5 is connected to the eleventh end 101 of the front-end detection module 9, the seventeenth end 67 of the main control module 5 is connected to the twelfth end 102 of the front-end detection module 9, the eighteenth end 68 of the main control module 5 is connected to the thirteenth end 103 of the front-end detection module 9, the nineteenth end 69 of the main control module 5 is connected to the fourteenth end 104 of the front-end detection module 9, the twentieth end 70 of the main control module 5 is connected to the fifteenth end 105 of the front-end detection module 9, the twenty-first end 71 of the main control module 5 is connected to the sixteenth end 106 of the front-end detection module 9, and is connected to the first power supply Vout.

[0101] Optionally, the water inlet detection circuit further includes a bidirectional transient suppression diode TVS1, and the bidirectional transient suppression diode TVS1 is connected between the positive terminal BAT+ and the negative terminal BAT- of the battery pack.

[0102] Among them, the bidirectional transient suppression diode TVS1 is used to limit the overvoltage and transient voltage in the circuit.

[0103] refer to Figure 7 , the specific working process of the water inlet detection circuit is:

[0104] When the battery pack is in a normal charging process, the voltage on the third terminal 53 of the main control module 5 outputs a high level, controls the first switch tube MOS1 to be turned on, and the switch module 4 is in a conducting state, so that the COM terminal is connected to the communication module 13. At this time, the communication module 13 communicates with the battery pack charger, that is, the COM terminal, to transmit the voltage, temperature and overcurrent signal of the battery pack. The input signal of the COM terminal is a high and low level. When the input is a high level, the high level signal flows to the fourth switch tube MOS4 through the thirty-fifth resistor R35, thereby turning on the fourth switch tube MOS4, and the output of the 30th terminal 80 of the main control module 5 is a low level; when the input is a low level, the low level signal flows to the fourth switch tube MOS4 through the thirty-fifth resistor R35, thereby turning on the fourth switch tube MOS4, and the output of the 30th terminal 80 of the main control module 5 is a high level (that is, VCC). Therefore, according to the high and low levels output by the 30th terminal 80 of the main control module 5, the charging operation of the battery pack can be indicated.

[0105] When the battery pack is in a normal discharge process, the positive terminal BAT+ and the negative terminal BAT- of the battery pack are connected to the load. At this time, the wake-up module 4 outputs a wake-up signal by flowing current through the negative terminal BAT- of the battery pack, and then the main control module 5 responds to the wake-up signal to activate the battery pack, and further controls the third switch tube MOS3 to turn on, so that the battery pack can normally power the load.

[0106] When the battery pack is flooded, the wake-up module 4 wakes up the main control module 5 after receiving the first water inflow signal from the negative terminal BAT-, and then the main control module 5 controls the switch module 3 to turn on. Therefore, the current of the positive terminal BAT+ flows to the negative terminal BAT- through the water circuit, and then flows to the waterproof detection terminal 1. The voltage on the waterproof detection terminal 1, that is, the second water inflow signal, flows to the first end 51 of the main control module 5 through the switch module 3, the third resistor R3 and the first resistor R1, and flows to the second end 52 of the main control module 5 through the switch module 3, the third resistor R3 and the second resistor R2. Therefore, after the battery pack is flooded, the main control module 5 can detect voltage signals at the first end 51 and the second end 52 at the same time, and then the voltage at the third end 53 of the main control module 5 outputs a low level, controls the first switch tube MOS1 to be turned off, and then the switch module 4 is in the off state so that the waterproof detection terminal 1 is disconnected from the waterproof detection module 2 circuit. At the same time, the main control module 5 no longer responds to the wake-up signal of the wake-up module 4, and then turns off the output circuit of the switch module 4 and the battery pack. At the same time, due to the presence of the fourth resistor R4, the first capacitor C1 and the voltage stabilizing diode ZD1, the voltage input to the main control module 5 can be filtered and stabilized. Due to the presence of the status indication module 6 and the detection control module 7, the detection control module 7 is controlled to output a detection signal, and then the main control module 5 responds to the detection signal and outputs a control signal to control the state of the status indication module 6, and the status indication module 6 is observed to determine whether there is residual water on the battery pack.

[0107] At the same time, due to the presence of the front-end detection module 9, it can detect the voltage of the first battery cell CL1 to the fifth battery cell CL5, and the front-end detection module 9 further transmits the voltage signal to the main control module 5, so that the main control module 5 can perform corresponding processing according to the voltage signal. The temperature detection module 11 is used to detect the temperature of the battery cell, the third switch tube MOS3 and the battery cell total positive CL5+ when the battery pack is working to ensure that the temperature of the battery pack is not too high when working. The overcurrent protection module 12 further avoids the risk of short circuit between the first electrode and the second electrode of the battery pack, and the burning module 14 can further write the program or data into the main control module 5 to enable it to perform the specified function. By setting multiple functional modules, the safety of the battery pack is further guaranteed.

[0108] Figure 7 A flow chart of a water inlet detection method provided in an embodiment of the utility model can be applied to the water inlet detection circuit provided in any of the above embodiments, with reference to Figure 7 , water ingress detection methods include:

[0109] S700: After the second water inlet signal is detected, the switch module is controlled to be turned on at a first preset time interval until the number of times the switch module is turned on reaches the first preset number of times or the second water inlet signal is not detected.

[0110] Specifically, when water enters the battery pack, the current at the positive terminal, that is, the first water inlet signal, flows to the negative terminal through the water circuit, and then flows to the wake-up module, so that the main control module responds to the wake-up signal and activates the battery pack, and the switch module opens. Therefore, the voltage on the waterproof detection terminal, that is, the second water inlet signal, flows to the main control module through the switch module and the waterproof detection module. When the main control module detects the second water inlet signal, the switch module is turned on at a first preset time interval until the first preset time interval reaches the first preset number of times or the main control module does not detect the second water inlet signal. Exemplarily, the first preset time is 10s, and the first preset number of times is 20 times. When the battery pack has been flooded for 10 seconds, the main control module automatically turns on the switch module so that the main control module can detect the second water inlet signal. If the main control module can still detect the second water inlet signal, the switch module will be turned on again after an interval of 10 seconds. When the number of times it is turned on reaches 20 times, if the main control module can still detect the second water inlet signal, the switch module will no longer be turned on according to the first preset time; if the main control module does not detect the second water inlet signal within the first preset number of times, the water inlet detection will be stopped.

[0111] S701. If the number of times the switch module is turned on reaches a first preset number of times and a second water inlet signal is detected, the switch module is controlled to be turned on every second preset time, and the number of times it is turned on is recounted until the number of times the switch module is turned on reaches a second preset number of times or the second water inlet signal is not detected; wherein the first preset number of times is greater than the second preset number of times, and the first preset time is less than the first preset time.

[0112] Specifically, when the number of times the main control module turns on the switch module at an interval of the first preset time reaches the first preset number, the main control module can still detect the second water inlet signal. At this time, the switch module turns on at an interval of the first preset time until the number of times the second preset time interval reaches the second preset number or the main control module does not detect the second water inlet signal. Exemplarily, the second preset time is 30 minutes, and the second preset number is 10 times. After the battery pack has been flooded for 30 minutes, the main control module automatically turns on the switch module so that the main control module can detect the second water inlet signal. If the main control module can still detect the second water inlet signal, the switch module is turned on again after an interval of 30 minutes. When the number of times it is turned on reaches 10 times, if the main control module can still detect the second water inlet signal, the switch module is no longer turned on according to the second preset time; if the main control module does not detect the second water inlet signal within the second preset number of times, the water inlet detection is stopped.

[0113] The technical solution provided in this embodiment controls the switch module to automatically turn on at intervals of the first preset time or the second preset time by setting the main control module, and the first preset time is less than the second preset time, so that the setting of the second preset time can ensure that the switch module will not be turned on multiple times in a short period of time to avoid excessive load or damage. And by flexibly adjusting the preset number of times and time, the performance and use cost of the device can be balanced according to actual needs, thereby improving the overall efficiency of the device.

[0114] Figure 8 A flowchart of another water ingress detection method provided by an embodiment of the utility model, referring to Figure 8 Based on the above embodiment, the waterproof detection method further includes:

[0115] S802. If the number of times the switch module is turned on reaches the second preset number of times and a second water inlet signal is detected, the switch module is controlled to be turned on every third preset time, and the number of times it is turned on is recounted until the number of times the switch module is turned on reaches the third preset number of times or the second water inlet signal is not detected; then the discharge module of the output circuit of the switch module and the battery pack is controlled to be locked.

[0116] Specifically, the second preset number of times is greater than the third preset number of times, and the second preset time is less than the third preset time. When the number of times the main control module turns on the switch module at an interval of the second preset time reaches the second preset number of times, the main control module can still detect the second water inlet signal. At this time, the switch module is turned on at an interval of the third preset time until the third preset time interval number of times reaches the third preset number of times or the main control module does not detect the second water inlet signal. Exemplarily, the third preset time is 1 hour, and the second preset number of times is 5 times. When the battery pack is flooded for 1 hour, the main control module automatically turns on the switch module so that the main control module can detect the second water inlet signal. If the main control module can still detect the second water inlet signal, the switch module is turned on again after an interval of 1 hour. When the number of times it is turned on reaches 5 times, if the main control module can still detect the second water inlet signal, the switch module and the discharge module are locked; if the main control module does not detect the second water inlet signal within the third preset number of times, the water inlet detection is stopped. The safety of the battery pack after long-term flooding is further ensured.

[0117] Fig. 9 A flowchart of another water ingress detection method provided by an embodiment of the present utility model, referring to Fig. 9 , based on the above embodiments, the water inlet detection circuit further includes a state indication module and a detection control module; the detection control module includes a button;

[0118] The status indication module is connected between the power supply and the main control module, and the detection control module is connected between the status indication module and the main control module;

[0119] The main control module is also used to control the state of the state indication module after receiving the detection signal output by the detection control module; the state indication module is used to indicate the water ingress state of the battery pack in response to the control signal of the main control module;

[0120] Water ingress detection methods also include:

[0121] S900: After detecting the second water inlet signal, control the switch module to turn on every first preset time until the number of times the switch module is turned on reaches the first preset number of times or the second water inlet signal is not detected. When the second water inlet signal is detected, control the state indicator module to flash.

[0122] Specifically, when water enters the battery pack, the detection control module is controlled to output a detection signal, and then the main control module responds to the detection signal and outputs a control signal to control the state of the status indication module, and the status indication module is observed to determine whether there is still water on the battery pack. Exemplarily, after the battery pack is flooded for 10 seconds, the main control module automatically turns on the switch module, so that the main control module can detect the second water inflow signal. If the main control module controls the status indication module to flash, it indicates that there is water on the output terminal of the battery pack.

[0123] S901. If the number of times the switch module is turned on reaches a first preset number of times and a second water inlet signal is detected, the switch module is controlled to be turned on every second preset time, and the number of times the switch module is turned on is recounted until the number of times the switch module is turned on reaches the second preset number of times or the second water inlet signal is not detected; wherein the first preset number of times is greater than the second preset number of times, and the first preset time is less than the first preset time. When the second water inlet signal is detected, the control state indicator module flashes.

[0124] Specifically, if the battery pack is not removed from the water after being turned on 20 times, the switch module is turned on again after an interval of 30 minutes so that the main control module can detect the second water inlet signal. If the status indicator module controlled by the main control module flashes, it indicates that there is water on the output terminal of the battery pack.

[0125] S902: If the number of times the switch module is turned on reaches a second preset number of times and a second water inflow signal is detected, the switch module is controlled to be turned on every third preset time, and the number of times the switch module is turned on is re-counted until the number of times the switch module is turned on reaches the third preset number of times or the second water inflow signal is not detected; the switch module and the discharge module of the output circuit of the battery pack are controlled to be locked. When the second water inflow signal is detected, the state indicator module is controlled to flash.

[0126] Specifically, when the battery pack is not taken out of water after being turned on 10 times, the switch module is turned on again after an interval of 1 hour, so that the main control module can detect the second water inlet signal. If the status indicator module controlled by the main control module flashes, it indicates that there is water on the output terminal of the battery pack.

[0127] S903: After detecting that the button is pressed, if a second water inflow signal is detected, the switch module and the discharge module of the output circuit of the battery pack are controlled to be locked.

[0128] Specifically, when the main control module controls the switch module to be turned on for 5 times, press the button, and if the main control module can still detect the second water inlet signal, the switch module and the discharge module are locked.

[0129] S904: After detecting that the button is pressed, if no second water inlet signal is detected, the control state indication module stops flashing.

[0130] When the battery pack is flooded for 10 seconds, the main control module automatically turns on the switch module, so that the main control module can detect the second water inlet signal. If the main control module controls the status indicator module to flash, it indicates that there is water on the output terminal of the battery pack. Take the battery pack out of the water, shake off the water remaining on the battery pack by hand, press the button, if the main control module responds to the state of the button and controls the status indicator module to stop flashing, it indicates that there is no residual water on the output terminal of the battery pack; if the battery pack is not taken out of the water after the number of openings reaches 20 times, turn on the switch module again after an interval of 30 minutes, so that the main control module can detect the second water inlet signal. If the main control module controls the status indicator module to flash, it indicates that there is water on the output terminal of the battery pack. Take the battery pack out of the water, shake off the water remaining on the battery pack by hand, press the button, if the main control module responds to the state of the button and the state indicator module stops flashing, it means that there is no residual water on the output terminal of the battery pack; when the battery pack is not taken out of the water after 10 times of opening, open the switch module again after an interval of 1 hour, so that the main control module can detect the second water inlet signal. If the main control module controls the state indicator module to flash, it means that there is water on the output terminal of the battery pack. Take the battery pack out of the water, shake off the water remaining on the battery pack by hand, press the button, if the main control module responds to the state of the button and the state indicator module stops flashing, it means that there is no residual water on the output terminal of the battery pack. At this time, when the state indicator module is off, press this button and the battery pack exits the lock mode.

[0131] The technical solution provided in this embodiment allows the user to intuitively judge whether there is residual water in the output terminal of the battery pack through the different lighting states of the status indicator module. In addition, the water ingress detection method includes a locking state and an exit locking state. When the battery pack is flooded for a long time, the switch module and the discharge module are locked to further ensure the safety of the battery pack.

[0132] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0133] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A water ingress detection circuit, applied to a battery pack, characterized in that: The water inlet detection circuit includes a waterproof detection terminal, a waterproof detection module, a switch module, a wake-up module and a main control module; The switch module is connected between the waterproof detection terminal and the waterproof detection module; the waterproof detection module and the switch module are also connected to the main control module; The battery pack includes a first electrode and a second electrode, the wake-up module is connected to the first electrode or the second electrode of the battery pack, the wake-up module is connected to the main control module, and the wake-up module is used to wake up the main control module according to a first water inflow signal of the first electrode or the second electrode; The main control module is used to control the on or off of the switch module after being awakened; the waterproof detection module is used to detect whether water has entered the battery pack after the switch module is turned on, and output a second water inlet signal after water has entered the battery pack; the main control module is also used to control the output circuit of the battery pack to be disconnected according to the second water inlet signal.

2. The circuit according to claim 1, characterized in that The waterproof detection module includes a voltage detection circuit, a voltage stabilizing circuit and a filter circuit; the voltage detection circuit includes a first resistor, a second resistor and a third resistor; the voltage stabilizing circuit includes a voltage stabilizing diode; The first end of the first resistor is connected to the first end of the main control module, the second end of the first resistor is respectively connected to the first end of the second resistor, the first pole of the voltage-regulating diode, and the first end of the third resistor, the second end of the second resistor is connected to the second end of the main control module, the first pole of the voltage-regulating diode is grounded, and the second end of the third resistor is connected to the filter circuit.

3. The circuit according to claim 2, characterized in that The filtering circuit includes a fourth resistor and a first capacitor; The first end of the fourth resistor is respectively connected to the first end of the first capacitor and the second end of the third resistor, the first end of the first capacitor is also connected to the switch module, and the second end of the fourth resistor and the second end of the first capacitor are both grounded.

4. The circuit according to claim 1, characterized in that The switch module includes a first switch tube; The control electrode of the first switch tube is connected to the third end of the main control module, the first electrode of the first switch tube is connected to the waterproof detection terminal, and the second electrode of the first switch tube is connected to the waterproof detection module.

5. The circuit according to claim 1, characterized in that It also includes a status indication module and a detection control module; The state indication module is connected between the power supply and the main control module, and the detection control module is connected between the state indication module and the main control module; The main control module is also used to control the state of the status indication module after receiving the detection signal output by the detection control module; the status indication module is used to indicate the water ingress status of the battery pack in response to the control signal of the main control module.

6. The circuit according to claim 5, characterized in that The state indication module includes a first light emitting diode, a second light emitting diode and a third light emitting diode; The first end of the first light-emitting diode, the first end of the second light-emitting diode, and the first end of the third light-emitting diode are all connected to the power line, the second end of the first light-emitting diode is connected to the fourth end of the main control module, the second end of the second light-emitting diode is connected to the fifth end of the main control module, and the second end of the third light-emitting diode is connected to the sixth end of the main control module.

7. The circuit according to claim 5, characterized in that The detection control module includes a button; a first end of the button is connected to a power line and to a seventh end of the main control module, and a second end of the button is grounded.

8. The circuit according to claim 1, characterized in that The wake-up module includes a second switch tube, a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor; The control electrode of the second switch tube is connected to the first end of the fifth resistor, the second end of the fifth resistor is connected to the eighth end of the main control module, the first electrode of the second switch tube is connected to the first end of the sixth resistor, the second electrode of the second switch tube is connected to the first end of the seventh resistor and the first end of the eighth resistor, the second end of the sixth resistor is connected to the first electrode or the second electrode of the battery pack, the second end of the seventh resistor is connected to the ninth end of the main control module, and the second end of the eighth resistor is grounded.

9. The circuit according to claim 1, characterized in that The waterproof detection terminal is arranged outside the battery pack, and the output circuit of the battery pack includes a discharge module; the discharge module is used to disconnect in response to the control signal output by the main control module according to the second water inlet signal on the waterproof detection terminal; the discharge module includes a third switch tube, and the third switch tube is connected in series between the first electrode and the second electrode of the battery pack.

10. The circuit according to claim 9, characterized in that The circuit also includes a front-end detection module and a battery pack; The battery pack and the third switch tube are connected in series and connected in series between the first electrode and the second electrode of the battery pack; The front-end detection module is connected to each battery cell of the battery pack and to the control electrode of the third switch tube. The front-end detection module is used to detect the voltage of each battery cell and transmit it to the main control module.

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