Battery wiring control circuit and device

Abstract

The utility model discloses a battery wiring control circuit and device, and relates to the technical field of batteries, and the circuit comprises a first switch module and a second switch module; according to the magnitude relationship between the first voltage at the first battery access point and the second voltage at the second battery access point, the access point with higher voltage at the first battery access point and the second battery access point is communicated with a high-voltage node through the first switch module, and the access point with lower voltage is communicated with a low-voltage node through the second switch module. Therefore, the situation that the battery connected to the first battery access point and the second battery access point cannot be normally charged and discharged through the high-voltage node due to reverse connection is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of battery charging and discharging, and in particular to a battery wiring control circuit and device. Background Art

[0002] In the prior art, portable battery products that are put on the market need to ensure that the portable batteries can be disassembled and replaced by the end user at any time during the service life. When the user disassembles the battery, the battery is equivalent to a separate component. If the battery purchased by the user on the market is different from the original one, it is very likely that the user will install the positive and negative electrodes of the battery in reverse when reinstalling the new model of battery, causing the product to malfunction, and even damage the product in serious cases. Utility Model Content

[0003] The main purpose of the present application is to provide a battery wiring control circuit and device, aiming to solve the technical problem of how to prevent the corresponding product from not working properly due to the battery being connected in reverse.

[0004] To achieve the above object, an embodiment of the present application provides a battery wiring control circuit, the battery wiring control circuit comprising: a first switch module and a second switch module;

[0005] The first control end of the first switch module, the first end of the first switch module, the first control end of the second switch module and the first end of the second switch module are connected to a first battery access point, the second control end of the first switch module, the second end of the first switch module, the second control end of the second switch module and the second end of the second switch module are connected to a second battery access point, the third end of the first switch module is connected to a high voltage node, and the third end of the second switch module is connected to a low voltage node;

[0006] The first battery access point is used to provide a first voltage when connected to the positive electrode of the battery or the negative electrode of the battery; the second battery access point is used to provide a second voltage when connected to the other electrode of the battery not connected to the first battery access point;

[0007] The first switch module is used to conduct a first high-voltage connection channel between the first battery access point and the high-voltage node when the first voltage is higher than the second voltage, and to conduct a second high-voltage connection channel between the second battery access point and the high-voltage node when the second voltage is higher than the first voltage;

[0008] The second switch module is used to conduct a second low-voltage connection channel between the second battery access point and the low-voltage node when the first voltage is higher than the second voltage, and to conduct a first low-voltage connection channel between the first battery access point and the low-voltage node when the second voltage is higher than the first voltage.

[0009] In one embodiment, the first switch module is further configured to conduct the first high-voltage connection channel when a first voltage difference between the first voltage and the second voltage exceeds a voltage difference threshold, and to conduct the second high-voltage connection channel when a second voltage difference between the second voltage and the first voltage exceeds the voltage difference threshold;

[0010] The second switch module is used to conduct the second low-voltage connection channel when the first voltage difference exceeds the voltage difference threshold, and to conduct the first low-voltage connection channel when the second voltage difference exceeds the voltage difference threshold.

[0011] In one embodiment, the battery wiring control circuit further includes: a power module and a controller;

[0012] The input end of the power module is used to connect to the charging device, the output end of the power module is connected to the high voltage node, the control end of the power module is connected to the first output end of the controller, the first input end of the controller is connected to the first battery access point, and the second input end of the controller is connected to the second battery access point;

[0013] The controller is configured to collect the first voltage and the second voltage, and send an enable signal to the power module when the corresponding first voltage difference and second voltage difference do not exceed the voltage difference threshold;

[0014] The power supply module is used to transmit the charging signal sent by the charging device to the high-voltage node when receiving the enable signal.

[0015] In one embodiment, the battery wiring control circuit further includes: a voltage detection module;

[0016] The battery further comprises an NTC pin, the NTC pin is connected to the negative electrode of the battery through an NTC resistor, and the NTC pin is used to connect an electrode detection node;

[0017] The first input end of the voltage detection module is connected to the electrode detection node, the second input end of the voltage detection module is connected to the second battery access point, and the output end of the voltage detection module is connected to the input end of the controller; the second output end of the controller is connected to the third control end of the first switch module, and the third output end of the controller is connected to the fourth control end of the first switch module;

[0018] The voltage detection module is used to collect the detection voltage between the electrode detection node and the second battery access point when the NTC pin of the battery is connected to the electrode detection node, and send the detection voltage to the controller;

[0019] The controller is further configured to send a first auxiliary start signal to the first switch module when the first voltage difference and the second voltage difference do not exceed the voltage difference threshold and the detection voltage is greater than a preset voltage;

[0020] The first switch module is further configured to conduct the first high-voltage connection channel upon receiving the first auxiliary start signal, so that the charging signal is transmitted to the first battery access point through the first high-voltage connection channel;

[0021] The second switch module is further configured to, when receiving the charging signal through the first battery access point, conduct the second low-voltage connection channel, so that the charging signal is transmitted to the low-voltage node through the second low-voltage connection channel and the battery is charged;

[0022] The controller is further configured to send a second auxiliary start signal to the first switch module when the first voltage difference and the second voltage difference do not exceed the voltage difference threshold and the detection voltage is not greater than a preset voltage;

[0023] The first switch module is further configured to, upon receiving the second auxiliary start signal, conduct the second high-voltage connection channel so that the charging signal is transmitted to the second battery access point through the second high-voltage connection channel;

[0024] The second switch module is further configured to, when receiving the charging signal through the second battery access point, conduct the first low-voltage connection channel, so that the charging signal is transmitted to the low-voltage node through the first low-voltage connection channel and the battery is charged.

[0025] In one embodiment, the voltage detection module includes: a first detection resistor, a second detection resistor and a third detection resistor;

[0026] The first end of the first detection resistor is connected to the detection voltage source, and the second end of the first detection resistor is connected to the electrode detection node; the first end of the second detection resistor is connected to the second battery access point, and the second end of the second detection resistor is respectively connected to the third input end of the controller and the first end of the third detection resistor, and the second end of the third detection resistor is grounded.

[0027] In one embodiment, the battery wiring control circuit further includes: an auxiliary drive module;

[0028] The first input end of the auxiliary driving module is connected to the second output end of the controller, and the first output end of the auxiliary driving module is connected to the third control end of the first switch module; the second input end of the auxiliary driving module is connected to the third output end of the controller, and the second output end of the auxiliary driving module is connected to the fourth control end of the first switch module;

[0029] The controller is further configured to send a first drive signal to the auxiliary drive module when both the first voltage difference and the second voltage difference do not exceed the voltage difference threshold and the detection voltage is greater than a preset voltage, and send a second drive signal to the auxiliary drive module when both the first voltage difference and the second voltage difference do not exceed the voltage difference threshold and the detection voltage is not greater than a preset voltage;

[0030] The auxiliary driving module is used to send the first auxiliary opening signal to the first switch module when receiving the first driving signal, and send the second auxiliary opening signal to the first switch module when receiving the second driving signal.

[0031] In one embodiment, the auxiliary driving module includes: a first N-type switch tube and a second N-type switch tube;

[0032] The input end of the first N-type switch tube is connected to the third control end of the first switch module, the output end of the first N-type switch tube is grounded, and the control end of the first N-type switch tube is connected to the second output end of the controller; the input end of the second N-type switch tube is connected to the fourth control end of the first switch module, the output end of the second N-type switch tube is grounded, and the control end of the second N-type switch tube is connected to the third output end of the controller.

[0033] In one embodiment, the auxiliary driving module includes: a first N-type switch tube and a second N-type switch tube;

[0034] The input end of the first N-type switch tube is connected to the third control end of the first switch module, the output end of the first N-type switch tube is grounded, and the control end of the first N-type switch tube is connected to the second output end of the controller; the input end of the second N-type switch tube is connected to the fourth control end of the first switch module, the output end of the second N-type switch tube is grounded, and the control end of the second N-type switch tube is connected to the third output end of the controller.

[0035] In one embodiment, the first switch module includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a first PMOS transistor and a second PMOS transistor;

[0036] The gate of the first PMOS tube is respectively connected to the second end of the first resistor and the first end of the second resistor, the source of the first PMOS tube is respectively connected to the first end of the first resistor and the high voltage node, and the drain of the first PMOS tube is respectively connected to the first end of the third resistor, the first battery access point and the first end of the second switch module;

[0037] The gate of the second PMOS tube is respectively connected to the second end of the third resistor and the first end of the fourth resistor, the source of the second PMOS tube is respectively connected to the second end of the fourth resistor and the high voltage node, and the drain of the second PMOS tube is respectively connected to the second end of the second resistor, the second battery access point and the second end of the second switch module.

[0038] In one embodiment, the second switch module includes: a first NMOS transistor and a second NMOS transistor;

[0039] The gate of the first NMOS tube is respectively connected to the second battery access point, the second control end of the first switch module, the second end of the first switch module and the drain of the second NMOS tube, the drain of the first NMOS tube is respectively connected to the gate of the second NMOS tube, the first battery access point, the first control end of the first switch module and the first end of the first switch module, and the source of the first NMOS tube and the source of the second NMOS tube are connected to the low voltage node.

[0040] In addition, to achieve the above-mentioned purpose, an embodiment of the present application further proposes a battery wiring control device, which adopts the battery wiring control circuit as described above.

[0041] The embodiment of the present application provides a battery wiring control circuit and device, the battery wiring control circuit comprising: a first switch module and a second switch module; the first control end of the first switch module, the first end of the first switch module, the first control end of the second switch module and the first end of the second switch module are connected to a first battery access point, the second control end of the first switch module, the second end of the first switch module, the second control end of the second switch module and the second end of the second switch module are connected to a second battery access point, the third end of the first switch module is connected to a high voltage node, and the third end of the second switch module is connected to a low voltage node; the first battery access point is used to provide a first voltage when connected to a positive electrode of a battery or a negative electrode of a battery; The second battery access point is used to provide a second voltage when connecting the other pole of the battery not connected to the first battery access point; the first switch module is used to conduct the first high-voltage connection channel between the first battery access point and the high-voltage node when the first voltage is higher than the second voltage, and to conduct the second high-voltage connection channel between the second battery access point and the high-voltage node when the second voltage is higher than the first voltage; the second switch module is used to conduct the second low-voltage connection channel between the second battery access point and the low-voltage node when the first voltage is higher than the second voltage, and to conduct the first low-voltage connection channel between the first battery access point and the low-voltage node when the second voltage is higher than the first voltage. According to the magnitude relationship between the first voltage at the first battery access point and the second voltage at the second battery access point, the first switch module is used to connect the access points with higher voltages at the first battery access point and the second battery access point to the high-voltage node, and the second switch module is used to connect the access points with lower voltages to the low-voltage node, so that the batteries connected to the first battery access point and the second battery access point will not be unable to charge and discharge normally through the high-voltage node due to reverse connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0044] Figure 1 A structural connection diagram provided for the first embodiment of the battery wiring control circuit of the present application;

[0045] Figure 2A circuit connection diagram provided for the second embodiment of the battery wiring control circuit of the present application;

[0046] Figure 3 This is a circuit connection diagram provided for the third embodiment of the battery wiring control circuit of the present application.

[0047] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0048] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0049] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0050] The main solution of the present application is: by comparing the first voltage of the first battery access point with the second voltage of the second battery access point through the first switch module, the access point corresponding to the higher voltage of the first and second voltages is connected to the high-voltage node according to the comparison result; in a similar manner, by connecting the access point corresponding to the higher voltage of the first and second voltages to the low-voltage node through the second switch module according to the comparison result of the first and second voltages. No matter how the battery is connected to the first battery access point and the second battery access point, the positive electrode of the battery with a higher voltage is connected to the high-voltage node through the first switch module, and the negative electrode of the battery with a lower voltage is connected to the low-voltage node through the second switch module, ensuring that the battery can always be charged and discharged normally through the high-voltage node.

[0051] At present, because portable battery products put on the market have relevant regulations that require that the portable battery can be disassembled and replaced by the end user at any time during the service life, the battery has become a separate component for the product. When the user disassembles the battery, if the battery purchased by the user on the market is different from the original one, it is very likely that the user will install the positive and negative poles of the battery in reverse when reinstalling the new model of battery, causing the product to malfunction, and even damage the product in serious cases. Therefore, how to prevent the corresponding product from malfunctioning due to reverse connection of the battery is a problem that needs to be solved urgently.

[0052] According to the magnitude relationship between the first voltage at the first battery access point and the second voltage at the second battery access point, the present application connects the first battery access point and the second battery access point with a higher voltage to a high-voltage node through a first switch module, and connects the access point with a lower voltage to a low-voltage node through a second switch module, so that the batteries connected to the first battery access point and the second battery access point will not be unable to be charged and discharged normally through the high-voltage node due to reverse connection.

[0053] Based on this, the present application proposes a battery connection control circuit of the first embodiment, please refer to Figure 1 , the battery wiring control circuit includes: a first switch module 10 and a second switch module 20;

[0054] The first control end of the first switch module 10, the first end of the first switch module 10, the first control end of the second switch module 20 and the first end of the second switch module 20 are connected to the first battery access point P1, the second control end of the first switch module 10, the second end of the first switch module 10, the second control end of the second switch module 20 and the second end of the second switch module 20 are connected to the second battery access point P2, the third end of the first switch module 10 is connected to the high voltage node PH, and the third end of the second switch module 20 is connected to the low voltage node PL;

[0055] The first battery access point P1 is used to provide a first voltage when connected to the positive electrode of the battery or the negative electrode of the battery; the second battery access point P2 is used to provide a second voltage when connected to the other electrode of the battery not connected to the first battery access point P1;

[0056] The first switch module 10 is used to conduct a first high-voltage connection channel between the first battery access point P1 and the high-voltage node PH when the first voltage is higher than the second voltage, and to conduct a second high-voltage connection channel between the second battery access point P2 and the high-voltage node PH when the second voltage is higher than the first voltage;

[0057] The second switch module 20 is used to conduct the second low-voltage connection channel between the second battery access point P2 and the low-voltage node PL when the first voltage is higher than the second voltage, and to conduct the first low-voltage connection channel between the first battery access point P1 and the low-voltage node PL when the second voltage is higher than the first voltage.

[0058] It should be understood that in this embodiment, the battery is not Figure 1As shown in the figure, the battery includes at least two poles (a positive pole and a negative pole). The positive pole or the negative pole can be connected to the first battery access point P1 or the second battery access point P2. If the positive pole is connected to the first battery access point P1, the negative pole is connected to the second battery access point P2. If the negative pole is connected to the first battery access point P1, the positive pole is connected to the second battery access point P2. When the first battery access point P1 is connected to the positive pole or the negative pole of the battery, if the battery stores electrical energy and discharges, the voltage generated by the first battery access point P1 due to the connection to the battery electrode is the first voltage; similarly, when the second battery access point P2 is connected to the negative pole or the positive pole of the battery, if the battery still stores electrical energy and discharges, the voltage generated by the second battery access point P1 due to the connection to the battery electrode is the second voltage.

[0059] It should be noted that, in this embodiment, the first end and the second end of the first switch module 10 can be respectively connected to the third end of the first switch module 10 through the internal switch structure, wherein the first high-voltage connection channel is between the first end of the first switch module 10 and the third end of the first switch module 10, and the second high-voltage connection channel is between the second end of the first switch module 10 and the third end of the first switch module 10. When the first high-voltage connection channel is turned on, the second high-voltage connection channel will be turned off. Similarly, when the second high-voltage connection channel is turned on, the first high-voltage connection channel will also be turned off, that is, only one of the first high-voltage connection channel and the second high-voltage connection channel can be turned on at the same time. The first end and the second end of the second switch module 20 can be respectively connected to the third end of the second switch module 20 through the internal switch structure, wherein the first end of the second switch module 20 and the third end of the second switch module 20 are the first low-voltage connection channel, and the second end of the second switch module 20 and the third end of the second switch module 20 are the second low-voltage connection channel. When the first low-pressure connection channel is turned on, the second low-pressure connection channel will be turned off. Similarly, when the second low-pressure connection channel is turned on, the first low-pressure connection channel will also be turned off, that is, only one of the first and second low-pressure connection channels can be turned on at the same time.

[0060] It is worth noting that in this embodiment, when the first high-voltage connection channel is turned on, the second high-voltage connection channel and the first low-voltage connection channel are turned off, and the second low-voltage connection channel is turned on; when the first high-voltage connection channel is turned off, the second high-voltage connection channel and the first low-voltage connection channel are turned on, and the second low-voltage connection channel is turned off. It can also be understood that there are only two situations in the first switch module 10 and the second switch module 20, either the first high-voltage connection channel and the second low-voltage connection channel are turned on at the same time, or the second high-voltage connection channel and the first low-voltage connection channel are turned on at the same time.

[0061] It is easy to understand that, in this embodiment, the control method of the first switch module 10 controlling the on-off state of the first high-voltage connection channel and the second high-voltage connection channel is determined by the magnitude relationship between the first voltage and the second voltage, and the first switch module 10 always turns on the first high-voltage connection channel or the second high-voltage connection channel between the high-voltage node PH and the first battery access point P1 or the second battery access point P2, which has a higher voltage among the first voltage and the second voltage. Similarly, the control method of the second switch module 20 controlling the on-off state of the first low-voltage connection channel and the second low-voltage connection channel is also determined by the magnitude relationship between the first voltage and the second voltage, and the second switch module 20 always turns on the first low-voltage connection channel or the second low-voltage connection channel between the first battery access point P1 or the second battery access point P2, which has a lower voltage among the first voltage and the second voltage, and the low-voltage node PL.

[0062] In a specific implementation, when the two poles of the battery are respectively connected to the first battery access point P1 and the second battery access point P2, if the first voltage is higher than the second voltage, it means that the battery electrode connected to the first battery access point P1 is a positive battery electrode that outputs a positive voltage, and the battery electrode connected to the second battery access point P2 is a negative battery electrode that outputs a negative voltage, then the first switch module 10 turns on the first high-voltage connection channel, and the second switch module 20 turns on the second low-voltage connection channel, so that "high-voltage node PH-first high-voltage connection channel-first battery access point P1-battery positive electrode-battery negative electrode-second battery access point P2-second low-voltage connection channel If the first voltage is not higher than the second voltage, it means that the battery electrode connected to the first battery access point P1 is the negative electrode of the battery that outputs negative voltage, and the battery electrode connected to the second battery access point P2 is the positive electrode of the battery that outputs positive voltage, then the first switch module 10 turns on the second high-voltage connection channel, and the second switch module 20 turns on the first low-voltage connection channel, so that the connection circuit corresponding to "high-voltage node PH-second high-voltage connection channel-second battery access point P2-battery positive electrode-battery negative electrode-first battery access point P1-first low-voltage connection channel-low-voltage node PL" is turned on. Through the above two control methods, it can be ensured that no matter how the battery is connected to the first battery access point P1 and the second battery access point P2, the high-voltage node PH is always connected to the positive electrode of the battery, and the low-voltage node PL is always connected to the negative electrode of the battery, and the battery can normally supply power to the load connected to it through the high-voltage node PH. In addition, the battery can also normally receive charging from the charging device 50 connected to it through the high-voltage node PH, and the user can avoid the situation where the battery is reversely connected and damages the battery and electrical equipment due to the replacement of a new battery.

[0063] The embodiment of the present application provides a battery wiring control circuit, the battery wiring control circuit comprising: a first switch module and a second switch module; the first control end of the first switch module, the first end of the first switch module, the first control end of the second switch module and the first end of the second switch module are connected to a first battery access point, the second control end of the first switch module, the second end of the first switch module, the second control end of the second switch module and the second end of the second switch module are connected to a second battery access point, the third end of the first switch module is connected to a high voltage node, and the third end of the second switch module is connected to a low voltage node; the first battery access point is used to provide a first voltage when connected to a positive electrode of a battery or a negative electrode of a battery; the The second battery access point is used to provide a second voltage when connecting the other pole of the battery not connected to the first battery access point; the first switch module is used to conduct the first high-voltage connection channel between the first battery access point and the high-voltage node when the first voltage is higher than the second voltage, and to conduct the second high-voltage connection channel between the second battery access point and the high-voltage node when the second voltage is higher than the first voltage; the second switch module is used to conduct the second low-voltage connection channel between the second battery access point and the low-voltage node when the first voltage is higher than the second voltage, and to conduct the first low-voltage connection channel between the first battery access point and the low-voltage node when the second voltage is higher than the first voltage. According to the magnitude relationship between the first voltage at the first battery access point and the second voltage at the second battery access point, the first switch module is used to connect the access points with higher voltages at the first battery access point and the second battery access point to the high-voltage node, and the second switch module is used to connect the access points with lower voltages to the low-voltage node, so that the batteries connected to the first battery access point and the second battery access point will not be unable to charge and discharge normally through the high-voltage node due to reverse connection.

[0064] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can refer to the above introduction, and will not be repeated later. Figure 2 The first switch module 10 is further configured to conduct the first high-voltage connection channel when a first voltage difference between the first voltage and the second voltage exceeds a voltage difference threshold, and to conduct the second high-voltage connection channel when a second voltage difference between the second voltage and the first voltage exceeds the voltage difference threshold;

[0065] The second switch module 20 is used to open the second low-voltage connection channel when the first voltage difference exceeds the voltage difference threshold, and to open the first low-voltage connection channel when the second voltage difference exceeds the voltage difference threshold.

[0066] It should be understood that in this embodiment, Figure 2 The voltage difference between the first voltage and the second voltage is the first voltage difference, the voltage difference between the second voltage and the first voltage is the second voltage difference, the values ​​of the first voltage difference and the second voltage difference should be the same, and the absolute value of the first voltage difference or the second voltage difference can be understood as the value of the battery voltage that the battery can currently output.

[0067] It should be noted that the voltage difference threshold is a value set by the user for the battery voltage that can be output when the battery power is about to be exhausted.

[0068] In a specific implementation, when the first voltage difference exceeds the voltage difference threshold, it means that when the battery power has not been exhausted, and the positive electrode of the battery is connected to the first battery access point P1, and the negative electrode of the battery is connected to the second battery access point P2, the first switch module 10 corresponds to turning on the first high-voltage connection channel, and the second switch module 20 corresponds to turning on the second low-voltage connection channel; when the second voltage difference exceeds the voltage difference threshold, it means that when the battery power has not been exhausted, and the negative electrode of the battery is connected to the first battery access point P1, and the positive electrode of the battery is connected to the second battery access point P2, the first switch module 10 corresponds to turning on the second high-voltage connection channel, and the second switch module 20 corresponds to turning on the first low-voltage connection channel.

[0069] Furthermore, in this embodiment, the battery connection control circuit further includes: a power module 30 and a controller 40;

[0070] The input end of the power module 30 is used to connect to the charging device 50, the output end of the power module 30 is connected to the high voltage node PH, the control end of the power module 30 is connected to the first output end of the controller 40, the first input end of the controller 40 is connected to the first battery access point P1, and the second input end of the controller 40 is connected to the second battery access point P2;

[0071] The controller 40 is used to collect the first voltage and the second voltage, and send an enable signal to the power module 30 when the corresponding first voltage difference and second voltage difference do not exceed the voltage difference threshold;

[0072] The power module 30 is used to transmit the charging signal sent by the charging device 50 to the high-voltage node PH when receiving the enable signal.

[0073] It should be noted that, in this embodiment, the first voltage at the first battery access point P1 and the second voltage at the second battery access point P2 can also be collected by the controller 40 with a voltage collection function, and the first voltage difference or the second voltage difference corresponding to the first voltage and the second voltage can be automatically determined. When the first voltage difference and the second voltage difference just do not exceed the voltage difference threshold, it means that the battery power is about to be exhausted, and the externally transmitted electric energy needs to be transmitted to the battery through the high-voltage node PH to charge the battery.

[0074] It is easy to understand that when the controller 40 detects that the first voltage difference and the second voltage difference just do not exceed the voltage difference threshold, it determines that the current battery needs to be charged, and outputs an enable signal to the power module 30 accordingly. When the power module 30 receives the enable signal, it can generate a charging signal corresponding to the voltage required for charging the battery through the electric energy transmitted by the charging device 50, and send the charging signal to the high-voltage node PH. Since the high-voltage node PH is always connected to the positive electrode of the battery, a higher voltage charging signal can be transmitted to the positive electrode of the battery to charge the battery normally.

[0075] It is worth noting that, in the present embodiment, the charging device 50 may be an adapter or a power board, and the connection interface between the charging device 50 and the power module 30 includes a TYPE-C interface.

[0076] Furthermore, in this embodiment, the battery connection control circuit further includes: a voltage detection module 60;

[0077] The battery further comprises an NTC pin, the NTC pin is connected to the negative electrode of the battery through an NTC resistor Rntc, and the NTC pin is used to connect an electrode detection node PJ;

[0078] The first input end of the voltage detection module 60 is connected to the electrode detection node PJ, the second input end of the voltage detection module 60 is connected to the second battery access point P2, and the output end of the voltage detection module 60 is connected to the input end of the controller 40; the second output end of the controller 40 is connected to the third control end of the first switch module 10, and the third output end of the controller 40 is connected to the fourth control end of the first switch module 10;

[0079] The voltage detection module 60 is used to collect the detection voltage between the electrode detection node PJ and the second battery access point P2 when the NTC pin of the battery is connected to the electrode detection node PJ, and send the detection voltage to the controller 40;

[0080] The controller 40 is further configured to send a first auxiliary start signal to the first switch module 10 when the first voltage difference and the second voltage difference do not exceed the voltage difference threshold and the detection voltage is greater than a preset voltage;

[0081] The first switch module 10 is further configured to conduct the first high-voltage connection channel upon receiving the first auxiliary start signal, so that the charging signal is transmitted to the first battery access point P1 through the first high-voltage connection channel;

[0082] The second switch module 20 is further configured to, when receiving the charging signal through the first battery access point P1, conduct the second low-voltage connection channel so that the charging signal is transmitted to the low-voltage node PL through the second low-voltage connection channel and the battery is charged;

[0083] The controller 40 is further configured to send a second auxiliary start signal to the first switch module 10 when the first voltage difference and the second voltage difference do not exceed the voltage difference threshold and the detection voltage is not greater than a preset voltage;

[0084] The first switch module 10 is further configured to, upon receiving the second auxiliary start signal, conduct the second high-voltage connection channel so that the charging signal is transmitted to the second battery access point P2 through the second high-voltage connection channel;

[0085] The second switch module 20 is further configured to, when receiving the charging signal through the second battery access point P2, conduct the first low-voltage connection channel so that the charging signal is transmitted to the low-voltage node PL through the first low-voltage connection channel and the battery is charged.

[0086] It should be understood that Figure 2 The specific structure of the battery is not shown in the figure, only the connection between the internal NTC resistor Rntc of the battery and other modules or devices of this embodiment is shown, and only the positive electrode of the battery is connected to the first battery access point P1 / the negative electrode of the battery is connected to the second battery access point P2. Figure 2 Consider all possible situations that may occur in this embodiment.

[0087] It is worth noting that in this embodiment, inside the battery, an NTC resistor Rntc is connected between the NTC pin of the battery and the negative electrode of the battery. The NTC pin of the battery and the positive electrode of the battery are equivalent to an open circuit. Outside the battery, the NTC pin of the battery and any pole of the battery can be connected to the voltage detection module 60 through the electrode detection node PJ and the second battery access point P2. In addition, the battery can also have multiple NTC pins, and correspondingly, inside the battery, each NTC pin and the negative electrode are correspondingly provided with an NTC resistor Rntc. In this embodiment, only a battery with a single NTC pin is used as an example.

[0088] It should be noted that if the battery power is completely exhausted, the first battery access point P1 cannot obtain sufficient first voltage, and the second battery access point P2 cannot obtain sufficient second voltage, and cannot directly support the normal operation of the first switch module 10 and the second switch module 20. At this time, it is impossible to determine whether the battery electrode connected to the first battery access point P1 and the second battery access point P2 is the positive electrode of the battery or the negative electrode of the battery through the first voltage and the second voltage, and it is impossible to control the first switch module 10 and the second switch module 20 to conduct the corresponding high-voltage connection channel and low-voltage connection channel.

[0089] It is easy to understand that in this embodiment, the detection voltage between the NTC pin and the negative electrode of the battery can be obtained by using the NTC resistor Rntc connected between the NTC pin of the battery and the negative electrode of the battery and the voltage detection module 60 containing a fixed voltage source inside. Since the voltage detection module 60 and the NTC resistor Rntc can form a series structure, when the negative electrode of the battery is connected to the second battery access point P2, the detection voltage should exceed the preset voltage set by the user; and there is no NTC resistor Rntc between the positive electrode of the battery and the NTC pin, so when the positive electrode of the battery is connected to the second battery access point P2, the voltage detection module 60 is equivalent to collecting the voltage of the second battery access point P2, that is, 0. Therefore, it is possible to determine how the current positive electrode and negative electrode of the battery are connected to the first battery access point P1 and the second battery access point P2 by detecting whether the voltage exceeds the preset voltage.

[0090] It should be noted that, in the present embodiment, after determining the connection mode between the current battery positive electrode and the battery negative electrode and the first battery access point P1 and the second battery access point P2 by detecting the voltage and the preset voltage, the controller 40 may further output a corresponding first auxiliary start signal to the first switch module 10, to assist the first switch module 10 in conducting the high-voltage connection channel between the first battery access point P1 or the second battery access point P2 connected to the battery positive electrode and the high-voltage node PH. At the same time, the controller 40 may also output a second auxiliary start signal to the second switch module 20, to assist the second switch module 20 in conducting the low-voltage connection channel between the first battery access point P1 or the second battery access point P2 connected to the battery negative electrode and the low-voltage node PL.

[0091] From the above explanation of the technical solution of this embodiment, it can be known that even if the battery power is completely exhausted, the technical solution of this embodiment can still control the first switch module 10 to conduct the high-voltage connection channel between the positive electrode of the battery and the high-voltage node PH, and control the second switch module 20 to conduct the low-voltage connection channel between the negative electrode of the battery and the low-voltage node PL.

[0092] Further, in this embodiment, the voltage detection module 60 includes: a first detection resistor Rs1, a second detection resistor Rs2 and a third detection resistor Rs3;

[0093] The first end of the first detection resistor Rs1 is connected to the detection voltage source VDD, and the second end of the first detection resistor Rs1 is connected to the electrode detection node PJ; the first end of the second detection resistor Rs2 is connected to the second battery access point P2, and the second end of the second detection resistor Rs2 is respectively connected to the third input end of the controller 40 and the first end of the third detection resistor Rs3, and the second end of the third detection resistor Rs3 is grounded.

[0094] It is easy to understand that in this embodiment, the first detection resistor Rs1 is used to connect the detection voltage source VDD capable of outputting a fixed voltage value and the electrode detection node PJ, and the second detection resistor Rs2 and the third detection resistor Rs3 form a series voltage divider structure for connecting the second battery access point P2 and the ground line. In a specific implementation, if the positive electrode of the battery is connected to the first battery access point P1 and the negative electrode of the battery is connected to the second battery access point P2, the connection loop of "detection voltage source VDD-first detection resistor Rs1-electrode detection node PJ-NTC pin-NTR resistor-battery negative electrode-second battery access point P2-second detection resistor Rs2-third detection resistor Rs3-ground" is turned on, and the voltage detection module 60 can output a detection voltage higher than the preset voltage to the controller 40; if the positive electrode of the battery is connected to the second battery access point P2 and the negative electrode of the battery is connected to the first battery access point P1, the connection loop of "detection voltage source VDD-first detection resistor Rs1-electrode detection node PJ-NTC pin-NTR resistor-battery negative electrode-first battery access point P1" and the connection loop of "battery positive electrode-second battery access point P2-second detection resistor Rs2-third detection resistor Rs3-ground" are turned on. Since the positive electrode of the battery cannot output a sufficient second voltage, the voltage detection module 60 cannot output a detection voltage higher than the preset voltage to the controller 40.

[0095] Based on the first embodiment and / or the second embodiment of the present application, in the third embodiment of the present application, the same or similar contents as those of the above-mentioned first and second embodiments can refer to the above introduction, and will not be repeated later. Figure 3, the battery wiring control circuit further includes: an auxiliary drive module 70;

[0096] The first input end of the auxiliary driving module 70 is connected to the second output end of the controller 40, and the first output end of the auxiliary driving module 70 is connected to the third control end of the first switch module 10; the second input end of the auxiliary driving module 70 is connected to the third output end of the controller 40, and the second output end of the auxiliary driving module 70 is connected to the fourth control end of the first switch module 10;

[0097] The controller 40 is further configured to send a first drive signal to the auxiliary drive module 70 when both the first voltage difference and the second voltage difference do not exceed the voltage difference threshold and the detection voltage is greater than a preset voltage, and to send a second drive signal to the auxiliary drive module 70 when both the first voltage difference and the second voltage difference do not exceed the voltage difference threshold and the detection voltage is not greater than a preset voltage;

[0098] The auxiliary driving module 70 is configured to send the first auxiliary opening signal to the first switch module 10 upon receiving the first driving signal, and to send the second auxiliary opening signal to the first switch module 10 upon receiving the second driving signal.

[0099] It should be understood that, when both the first voltage difference and the second voltage difference do not exceed the voltage difference threshold and the detection voltage is greater than the preset voltage, it can be understood as a situation where the current battery power is low and the positive electrode of the battery is connected to the first battery access point P1, and the negative electrode of the battery is connected to the second battery access point P2; when both the first voltage difference and the second voltage difference do not exceed the voltage difference threshold and the detection voltage is not greater than the preset voltage, it can be understood as a situation where the current battery power is low and the positive electrode of the battery is connected to the second battery access point P2, and the negative electrode of the battery is connected to the first battery access point P1.

[0100] It should be noted that, in the present embodiment, the output capacity of the controller 40 is limited, and therefore the auxiliary drive module 70 is required as a drive circuit to drive the first switch module 10 and the second switch module 20 to work normally. In a specific implementation, if the current battery power is insufficient and the positive electrode of the battery is connected to the first battery access point P1, and the negative electrode of the battery is connected to the second battery access point P2, the controller 40 sends a first drive signal to the auxiliary drive module 70, and the auxiliary drive module 70 sends a first auxiliary start signal with sufficient drive capacity to the first switch module 10 to assist the first switch module 10 in opening the corresponding first high-voltage connection channel. At this time, the first voltage is much higher than the second voltage, and the first voltage of the first battery access point P1 and the second voltage of the second battery access point P2 can support the second switch module 20 to work normally. The second switch module 20 correspondingly turns on the second low-voltage connection channel, so that the positive electrode of the battery connected to the first battery access point P1 can normally receive the charging signal for positive charging. Normal charging; if the current battery power is insufficient and the positive electrode of the battery is connected to the second battery access point P2, and the negative electrode of the battery is connected to the first battery access point P1, the controller 40 sends a second drive signal to the auxiliary drive module 70, and the auxiliary drive module 70 sends a second auxiliary start signal with sufficient driving capability to the first switch module 10 to assist the first switch module 10 in opening the corresponding second high-voltage connection channel. At this time, the second voltage is much higher than the first voltage, and the first voltage of the first battery access point P1 and the second voltage of the second battery access point P2 can support the second switch module 20 to work normally. The second switch module 20 correspondingly turns on the first low-voltage connection channel, so that the positive electrode of the battery connected to the second battery access point P2 can normally receive the charging signal for normal charging.

[0101] Furthermore, in this embodiment, the auxiliary driving module 70 includes: a first N-type switch tube Vn1 and a second N-type switch tube Vn2;

[0102] The input end of the first N-type switch tube Vn1 is connected to the third control end of the first switch module 10, the output end of the first N-type switch tube Vn1 is grounded, and the control end of the first N-type switch tube Vn1 is connected to the second output end of the controller 40; the input end of the second N-type switch tube Vn2 is connected to the fourth control end of the first switch module 10, the output end of the second N-type switch tube Vn2 is grounded, and the control end of the second N-type switch tube Vn2 is connected to the third output end of the controller 40.

[0103] It is easy to understand that the first N-type switch tube Vn1 is used as a driving circuit between the second output terminal of the controller 40 and the third control terminal of the first switch module 10. When receiving a high-level first auxiliary signal, the first auxiliary start signal of a low level is output to enable the first switch module 10 to open the first high-voltage connection channel between the first battery access point P1 and the high-voltage node PH; the second N-type switch tube Vn2 is used as a driving circuit between the third output terminal of the controller 40 and the fourth control terminal of the first switch module 10. When receiving a high-level second auxiliary signal, the second auxiliary start signal of a low level is output to enable the first switch module 10 to open the second high-voltage connection channel between the second battery access point P2 and the high-voltage node PH.

[0104] It is worth noting that, in the present embodiment, the first N-type switch tube Vn1 and the second N-type switch tube Vn2 may also be P-type switch tubes, which may specifically be MOS tubes, triodes and other switch devices, which are not specifically limited here.

[0105] Further, in this embodiment, the first switch module 10 includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first PMOS transistor Qp1 and a second PMOS transistor Qp2;

[0106] The gate of the first PMOS transistor Qp1 is respectively connected to the second end of the first resistor R1 and the first end of the second resistor R2, the source of the first PMOS transistor Qp1 is respectively connected to the first end of the first resistor R1 and the high voltage node PH, and the drain of the first PMOS transistor Qp1 is respectively connected to the first end of the third resistor R3, the first battery access point P1 and the first end of the second switch module 20;

[0107] The gate of the second PMOS tube Qp2 is respectively connected to the second end of the third resistor R3 and the first end of the fourth resistor R4, the source of the second PMOS tube Qp2 is respectively connected to the second end of the fourth resistor R4 and the high-voltage node PH, and the drain of the second PMOS tube Qp2 is respectively connected to the second end of the second resistor R2, the second battery access point P2 and the second end of the second switch module 20.

[0108] It should be noted that, in the present embodiment, when the battery power is sufficient, if the positive electrode of the battery is connected to the first battery access point P1, and the negative electrode of the battery is connected to the second battery access point P2, the first voltage at the drain of the first PMOS tube Qp1 is a positive voltage. Since the first PMOS tube Qp1 has a body diode, the first voltage can be transmitted to the source of the first PMOS tube Qp1, and the source of the first PMOS tube Qp1 is also in a positive voltage state, while the second end of the second resistor R2 is connected to the second battery access point P2 and is in a negative voltage state, and there is a voltage divider structure between the first resistor R1 and the second resistor R2, so that the gate voltage of the first PMOS tube Qp1 is low, the source voltage is high, and Vgs of the first PMOS tube Qp1 is <0, and is in a corresponding conduction voltage. range, the first PMOS tube Qp1 is turned on, and the first high-voltage connection channel is turned on; on the contrary, the second voltage at the drain of the second PMOS tube Qp2 is a negative voltage. Since the second PMOS tube Qp2 has a body diode, the second voltage can be transmitted to the source of the second PMOS tube Qp2. The source of the second PMOS tube Qp2 is also in a negative voltage state, and the first end of the third resistor R3 is connected to the first battery access point P1 and is in a positive voltage state, and there is a voltage dividing structure between the third resistor R3 and the fourth resistor R4, so that the gate voltage of the second PMOS tube Qp2 is high and the source voltage is low, Vgs of the second PMOS tube Qp2>0, which is not in the corresponding turn-on voltage range, the second PMOS tube Qp2 is turned off, and the second high-voltage connection channel is turned off. The situation where the positive electrode of the battery is connected to the first battery access point P1 and the negative electrode of the battery is connected to the second battery access point P2 is opposite to the above situation. The Vgs of the first PMOS tube Qp1 is greater than 0 and is not in the corresponding conduction voltage range. The first PMOS tube Qp1 is turned off, and the first high-voltage connection channel is turned off; the Vgs of the second PMOS tube Qp2 is less than 0 and is in the corresponding conduction voltage range. The second PMOS tube Qp2 is turned on, and the second high-voltage connection channel is turned on.

[0109] It is worth noting that in this embodiment, the gate of the first PMOS transistor Qp1 also serves as the third control terminal of the first switch module 10, and the gate of the second PMOS transistor Qp2 also serves as the fourth control terminal of the first switch module 10. When the battery is exhausted, the first voltage of the first battery access point P1 and the second voltage of the second battery access point P2 are both 0, and the high-voltage node PH receives a charging signal and is in a high-voltage state. If the controller 40 determines through the voltage detection module 60 that the positive electrode of the battery is connected to the first battery access point P1 and the negative electrode of the battery is connected to the second battery access point P2, then the controller 40 sends a corresponding control signal to the third control end of the first switch module 10 to assist the first switch module 10 in turning on the first high-voltage connection channel, so that the gate of the first PMOS tube Qp1 is in a low voltage state, and the source of the first PMOS tube Qp1 is in a high voltage state due to receiving the charging signal, so that Vgs of the first PMOS tube Qp1 is less than 0 and is in the corresponding conduction voltage range, the first PMOS tube Qp1 is turned on, and the first high-voltage connection channel is turned on; while the gate of the second PMOS tube Qp2 does not receive the low voltage signal sent by the controller 40 and is in a high voltage state, and at the same time, the first end of the third resistor R3 is also in a high voltage state after receiving the charging signal through the first battery access point P1, and the source of the second PMOS tube Qp2 is also in a high voltage state after receiving the charging signal through the high-voltage node PH, so Vgs of the first PMOS tube Qp1 cannot reach its corresponding conduction voltage range, the second PMOS tube Qp2 is turned off, and the second high-voltage connection channel is turned off. On the contrary, if the controller 40 determines through the voltage detection module 60 that the positive electrode of the battery is connected to the second battery access point P2 and the negative electrode of the battery is connected to the first battery access point P1, then the Vgs of the second PMOS tube Qp2 is <0 and is in the corresponding conduction voltage range, the second PMOS tube Qp2 is turned on, and the second high-voltage connection channel is turned on; while the Vgs of the first PMOS tube Qp1 cannot reach its corresponding conduction voltage range, the first PMOS tube Qp1 is turned off, and the first high-voltage connection channel is turned off.

[0110] Furthermore, in this embodiment, the second switch module 20 includes: a first NMOS transistor Qn1 and a second NMOS transistor Qn2;

[0111] The gate of the first NMOS transistor Qn1 is respectively connected to the second battery access point P2, the second control end of the first switch module 10, the second end of the first switch module 10 and the drain of the second NMOS transistor Qn2, the drain of the first NMOS transistor Qn1 is respectively connected to the gate of the second NMOS transistor Qn2, the first battery access point P1, the first control end of the first switch module 10 and the first end of the first switch module 10, and the source of the first NMOS transistor Qn1 and the source of the second NMOS transistor Qn2 are connected to the low voltage node PL.

[0112] It is easy to understand that the source of the first NMOS transistor Qn1 and the source of the second NMOS transistor Qn2 are both connected to the low voltage node PL and are in a low voltage state. Therefore, if the gate of the first NMOS transistor Qn1 is in a high voltage state, it is automatically turned on, and if the gate of the first NMOS transistor Qn1 is in a low voltage state, it is automatically turned off; similarly, if the gate of the second NMOS transistor Qn2 is in a high voltage state, it is automatically turned on, and if the gate of the second NMOS transistor Qn2 is in a low voltage state, it is automatically turned off. The gate of the first NMOS tube Qn1 is connected to the second battery access point P2, and the gate of the second NMOS tube Qn2 is connected to the first battery access point P1. Therefore, when the first battery access point P1 is connected to the positive electrode of the battery and the second battery access point P2 is connected to the negative electrode of the battery, no matter whether the battery power is exhausted or not, the first voltage is always high, the second voltage is always low, the first NMOS tube Qn1 is turned off (the first low-voltage connection channel is turned off), and the second NMOS tube Qn2 is turned on (the second low-voltage connection channel is turned on); when the first battery access point P1 is connected to the negative electrode of the battery and the second battery access point P2 is connected to the positive electrode of the battery, no matter whether the battery power is exhausted or not, the first voltage is always low, the second voltage is always high, the first NMOS tube Qn1 is turned on (the first low-voltage connection channel is turned on), and the second NMOS tube Qn2 is turned off (the second low-voltage connection channel is turned on).

[0113] In addition, to achieve the above-mentioned purpose, the embodiment of the present application also proposes a battery wiring control device, and the battery wiring control device adopts all the embodiments of the battery wiring control circuit described above. Compared with the prior art, the beneficial effects of the battery wiring control device provided by the embodiment of the present application are the same as the beneficial effects of the battery wiring control circuit provided by the above-mentioned embodiment, and other technical features in the battery wiring control device are the same as the features disclosed in the above-mentioned embodiment, which will not be repeated here.

[0114] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent processing scope of the present application.

Claims

1. A battery connection control circuit, characterized in that: The battery wiring control circuit includes: a first switch module and a second switch module; The first control end of the first switch module, the first end of the first switch module, the first control end of the second switch module and the first end of the second switch module are connected to a first battery access point, the second control end of the first switch module, the second end of the first switch module, the second control end of the second switch module and the second end of the second switch module are connected to a second battery access point, the third end of the first switch module is connected to a high voltage node, and the third end of the second switch module is connected to a low voltage node; The first battery access point is used to provide a first voltage when connected to the positive electrode of the battery or the negative electrode of the battery; the second battery access point is used to provide a second voltage when connected to the other electrode of the battery not connected to the first battery access point; The first switch module is used to conduct a first high-voltage connection channel between the first battery access point and the high-voltage node when the first voltage is higher than the second voltage, and to conduct a second high-voltage connection channel between the second battery access point and the high-voltage node when the second voltage is higher than the first voltage; The second switch module is used to conduct a second low-voltage connection channel between the second battery access point and the low-voltage node when the first voltage is higher than the second voltage, and to conduct a first low-voltage connection channel between the first battery access point and the low-voltage node when the second voltage is higher than the first voltage.

2. The battery connection control circuit according to claim 1, characterized in that: The first switch module is further configured to conduct the first high-voltage connection channel when a first voltage difference between the first voltage and the second voltage exceeds a voltage difference threshold, and to conduct the second high-voltage connection channel when a second voltage difference between the second voltage and the first voltage exceeds the voltage difference threshold; The second switch module is used to conduct the second low-voltage connection channel when the first voltage difference exceeds the voltage difference threshold, and to conduct the first low-voltage connection channel when the second voltage difference exceeds the voltage difference threshold.

3. The battery connection control circuit according to claim 2, characterized in that: The battery wiring control circuit also includes: a power module and a controller; The input end of the power module is used to connect to the charging device, the output end of the power module is connected to the high voltage node, the control end of the power module is connected to the first output end of the controller, the first input end of the controller is connected to the first battery access point, and the second input end of the controller is connected to the second battery access point; The controller is configured to collect the first voltage and the second voltage, and send an enable signal to the power module when the corresponding first voltage difference and second voltage difference do not exceed the voltage difference threshold; The power module is used to transmit the charging signal sent by the charging device to the high-voltage node when receiving the enable signal.

4. The battery connection control circuit according to claim 3, characterized in that: The battery wiring control circuit further includes: a voltage detection module; The battery further comprises an NTC pin, the NTC pin is connected to the negative electrode of the battery through an NTC resistor, and the NTC pin is used to connect an electrode detection node; The first input end of the voltage detection module is connected to the electrode detection node, the second input end of the voltage detection module is connected to the second battery access point, and the output end of the voltage detection module is connected to the input end of the controller; the second output end of the controller is connected to the third control end of the first switch module, and the third output end of the controller is connected to the fourth control end of the first switch module; The voltage detection module is used to collect the detection voltage between the electrode detection node and the second battery access point when the NTC pin of the battery is connected to the electrode detection node, and send the detection voltage to the controller; The controller is further configured to send a first auxiliary start signal to the first switch module when the first voltage difference and the second voltage difference do not exceed the voltage difference threshold and the detection voltage is greater than a preset voltage; The first switch module is further configured to conduct the first high-voltage connection channel upon receiving the first auxiliary start signal, so that the charging signal is transmitted to the first battery access point through the first high-voltage connection channel; The second switch module is further configured to, when receiving the charging signal through the first battery access point, conduct the second low-voltage connection channel, so that the charging signal is transmitted to the low-voltage node through the second low-voltage connection channel and the battery is charged; The controller is further configured to send a second auxiliary start signal to the first switch module when the first voltage difference and the second voltage difference do not exceed the voltage difference threshold and the detection voltage is not greater than a preset voltage; The first switch module is further configured to conduct the second high-voltage connection channel upon receiving the second auxiliary start signal, so that the charging signal is transmitted to the second battery access point through the second high-voltage connection channel; The second switch module is further configured to, when receiving the charging signal through the second battery access point, conduct the first low-voltage connection channel, so that the charging signal is transmitted to the low-voltage node through the first low-voltage connection channel and the battery is charged.

5. The battery connection control circuit according to claim 4, characterized in that: The voltage detection module includes: a first detection resistor, a second detection resistor and a third detection resistor; The first end of the first detection resistor is connected to the detection voltage source, and the second end of the first detection resistor is connected to the electrode detection node; the first end of the second detection resistor is connected to the second battery access point, and the second end of the second detection resistor is respectively connected to the third input end of the controller and the first end of the third detection resistor, and the second end of the third detection resistor is grounded.

6. The battery connection control circuit according to claim 4, characterized in that: The battery wiring control circuit also includes: an auxiliary drive module; The first input end of the auxiliary driving module is connected to the second output end of the controller, and the first output end of the auxiliary driving module is connected to the third control end of the first switch module; the second input end of the auxiliary driving module is connected to the third output end of the controller, and the second output end of the auxiliary driving module is connected to the fourth control end of the first switch module; The controller is further configured to send a first drive signal to the auxiliary drive module when both the first voltage difference and the second voltage difference do not exceed the voltage difference threshold and the detection voltage is greater than a preset voltage, and send a second drive signal to the auxiliary drive module when both the first voltage difference and the second voltage difference do not exceed the voltage difference threshold and the detection voltage is not greater than a preset voltage; The auxiliary driving module is used to send the first auxiliary opening signal to the first switch module when receiving the first driving signal, and send the second auxiliary opening signal to the first switch module when receiving the second driving signal.

7. The battery connection control circuit according to claim 6, characterized in that: The auxiliary driving module includes: a first N-type switch tube and a second N-type switch tube; The input end of the first N-type switch tube is connected to the third control end of the first switch module, the output end of the first N-type switch tube is grounded, and the control end of the first N-type switch tube is connected to the second output end of the controller; the input end of the second N-type switch tube is connected to the fourth control end of the first switch module, the output end of the second N-type switch tube is grounded, and the control end of the second N-type switch tube is connected to the third output end of the controller.

8. The battery connection control circuit according to any one of claims 1 to 7, characterized in that: The first switch module includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a first PMOS transistor and a second PMOS transistor; The gate of the first PMOS tube is respectively connected to the second end of the first resistor and the first end of the second resistor, the source of the first PMOS tube is respectively connected to the first end of the first resistor and the high voltage node, and the drain of the first PMOS tube is respectively connected to the first end of the third resistor, the first battery access point and the first end of the second switch module; The gate of the second PMOS tube is respectively connected to the second end of the third resistor and the first end of the fourth resistor, the source of the second PMOS tube is respectively connected to the second end of the fourth resistor and the high voltage node, and the drain of the second PMOS tube is respectively connected to the second end of the second resistor, the second battery access point and the second end of the second switch module.

9. The battery connection control circuit according to any one of claims 1 to 7, characterized in that: The second switch module includes: a first NMOS tube and a second NMOS tube; The gate of the first NMOS tube is respectively connected to the second battery access point, the second control end of the first switch module, the second end of the first switch module and the drain of the second NMOS tube, the drain of the first NMOS tube is respectively connected to the gate of the second NMOS tube, the first battery access point, the first control end of the first switch module and the first end of the first switch module, and the source of the first NMOS tube and the source of the second NMOS tube are connected to the low voltage node.

10. A battery connection control device, characterized in that: The battery wiring control device adopts the battery wiring control circuit as described in any one of claims 1-9.

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