Battery circuit and electronic equipment

Abstract

The utility model relates to the technical field of power supply circuits, in particular to a battery circuit and electronic equipment. The battery circuit comprises a battery module, an interface module, a first anti-reverse module and a second anti-reverse module. The battery module is provided with a charging path and a discharging path. The interface module is used for being connected with external equipment and comprises a charging interface located on a charging path and a discharging interface located on a discharging path. The first reverse current prevention module is located on the charging path and used for detecting a first reverse current on the charging path and cutting off the first reverse current on the charging path. And the second reverse prevention module is positioned on the discharge path and is used for detecting a second reverse current on the discharge path and cutting off the second reverse current on the discharge path. According to the battery circuit, the first anti-reverse module and the second anti-reverse module are correspondingly arranged on the charging path and the discharging path of the battery circuit respectively, so that the battery circuit has a reverse current blocking function during charging and discharging, and the battery circuit and external equipment are protected from being damaged.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of power supply circuits, and in particular to a battery circuit and an electronic device. Background Art

[0002] When lithium batteries are designed, different ports for charging and discharging are often used due to different needs and uses. For example, some electronic devices have separate charging and discharging ports to meet the application needs of charging and discharging at the same time.

[0003] At present, the battery circuits with separate charging and discharging ports mainly have protection measures against overcurrent, overvoltage, and overtemperature, but do not have protection measures against reverse current. For example, when the power supply device is mistakenly connected to the discharge port of the electronic device, the power supply device inputs reverse current to the discharge path of the battery circuit through the discharge port, thereby damaging the battery circuit; or when the power supply device charges the battery circuit through the charging port, if the charging function of the power supply device fails, reverse current is easily generated on the charging path of the battery circuit and output to the power supply device through the charging port, thereby further damaging the power supply device.

[0004] Therefore, the current battery circuit with separate charging and discharging ports lacks protection against reverse current. Summary of the invention

[0005] One purpose of the embodiments of the present application is to provide a battery circuit to solve the technical problem that the battery circuit with separate charging and discharging ports lacks protection against reverse current.

[0006] In one aspect, an embodiment of the present application provides a battery circuit, comprising:

[0007] A battery module, used for charging and / or discharging, wherein the battery module is provided with a charging path and a discharging path;

[0008] An interface module, used to connect an external device, the interface module comprising a charging interface located on the charging path and a discharging interface located on the discharging path;

[0009] a first reverse current prevention module, located on the charging path, configured to detect a first reverse current on the charging path, and when detecting the first reverse current on the charging path, cut off the first reverse current on the charging path; and

[0010] The second reverse protection module is located on the discharge path and is used to detect a second reverse current on the discharge path and cut off the second reverse current on the discharge path when the second reverse current is detected on the discharge path.

[0011] Optionally, a charging node is provided on the connection path between the battery module and the first anti-reverse module;

[0012] The first anti-reverse module comprises:

[0013] a first detection unit, electrically connected to the charging interface and the charging node, respectively, for detecting a first voltage difference between the charging interface and the charging node, and comparing the first voltage difference with a first preset threshold value, and generating a first driving signal according to the comparison result; and

[0014] a first switch unit, electrically connected to the charging node, the charging interface and the first detection unit, respectively, and configured to control a connection state between the charging node and the charging interface according to the first driving signal;

[0015] When the first voltage difference is greater than the first preset threshold, the first switch unit is turned on, and when the first voltage difference is less than the first preset threshold, the first switch unit is turned off.

[0016] Optionally, a discharge node is provided on the connection path between the battery module and the second anti-reverse module;

[0017] The second anti-reverse module comprises:

[0018] a second detection unit, electrically connected to the discharge interface and the discharge node, respectively, for detecting a second voltage difference between the discharge node and the discharge interface, and comparing the second voltage difference with a second preset threshold value, and generating a second driving signal according to the comparison result; and

[0019] a second switch unit, electrically connected to the discharge node, the discharge interface and the second detection unit, respectively, and configured to control a connection state between the discharge node and the discharge interface according to the second driving signal;

[0020] When the second voltage difference is greater than the second preset threshold, the second switch unit is turned on, and when the second voltage difference is less than the second preset threshold, the second switch unit is turned off.

[0021] Optionally, the first switch unit includes a first field effect transistor, a gate of the first field effect transistor is connected to the first detection unit, a source of the first field effect transistor is connected to the charging interface, and a drain of the first field effect transistor is connected to the charging node.

[0022] Optionally, the first detection unit includes a first ideal diode, an input end of the first ideal diode is connected to the charging interface, an output end of the first ideal diode is connected to the charging node, and a driving end of the first ideal diode is connected to the first switch unit.

[0023] Optionally, the second switch unit includes a second field effect transistor, a gate of the second field effect transistor is connected to the second detection unit, a source of the second field effect transistor is connected to the discharge node, and a drain of the second field effect transistor is connected to the discharge interface.

[0024] Optionally, the second detection unit includes a second ideal diode, an input end of the second ideal diode is connected to the discharge node, an output end of the second ideal diode is connected to the discharge interface, and a driving end of the second ideal diode is connected to the second switch unit.

[0025] Optionally, the battery module includes:

[0026] Battery pack;

[0027] A sampling unit, connected to the battery pack, for obtaining electrical parameters and temperature parameters of the battery pack;

[0028] a battery management unit, electrically connected to the sampling unit, configured to generate a third driving signal and a fourth driving signal, and adjust the third driving signal and the fourth driving signal according to the electrical parameter and the temperature parameter of the battery pack;

[0029] a charging switch unit, electrically connected to the battery management unit, the battery pack and the first anti-reverse module, respectively, and configured to be turned on or off according to the third driving signal to control the connection state between the battery pack and the first anti-reverse module; and

[0030] A discharge switch unit is electrically connected to the battery management unit, the battery pack and the second anti-reverse module respectively, and is used to be turned on or off according to the fourth driving signal to control the connection state of the battery pack and the second anti-reverse module.

[0031] Optionally, the charging switch unit includes a third field effect transistor, a gate of the third field effect transistor is connected to the battery management unit, a source of the third field effect transistor is connected to the positive electrode of the battery pack, and a drain of the third field effect transistor is connected to the first anti-reverse module;

[0032] The discharge switch unit includes a fourth field effect transistor, a gate of the fourth field effect transistor is connected to the battery management unit, a source of the fourth field effect transistor is connected to the second anti-reverse module, and a drain of the fourth field effect transistor is connected to the positive electrode of the battery pack.

[0033] On the other hand, an embodiment of the present application provides an electronic device, comprising a battery circuit as described in any one of the above items.

[0034] The embodiments of the present application can achieve the following technical effects: by respectively setting a first anti-reverse module and a second anti-reverse module on the charging path and the discharging path of the battery circuit, respectively detecting the reverse current on the charging path and the discharging path, and connecting the battery circuit with the external device when the reverse current is detected, so that the battery circuit has the function of protecting against reverse current during both charging and discharging, thereby protecting the battery circuit and external devices at the charging and discharging ports from damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] One or several embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0036] Figure 1 A first principle block diagram of a battery circuit provided in an embodiment of the present application;

[0037] Figure 2 A second principle block diagram of a battery circuit provided in an embodiment of the present application;

[0038] Figure 3 A schematic diagram of a battery circuit provided in an embodiment of the present application;

[0039] Figure 4 A third principle block diagram of a battery circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "connecting" another element, it can be directly on another element, or there can be one or more centered elements therebetween. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "upper end", "lower end", "top" and "bottom" used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0041] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0042] This embodiment provides a battery circuit, which is intended to detect reverse current appearing at each interface (charging interface, discharging interface), and to promptly block the electrical connection with an external device when reverse current appears.

[0043] See also Figure 1 , the battery circuit of this embodiment includes a battery module 11, an interface module, a first anti-reverse module 14 and a second anti-reverse module 15. The battery module 11 is used for charging and / or discharging, and the battery module 11 is provided with a charging path and a discharging path. The interface module is used to connect an external device, and the interface module includes a charging interface 12 located on the charging path and a discharging interface 13 located on the discharging path. The first anti-reverse module 14 is located on the charging path. Specifically, the first anti-reverse module 14 is electrically connected to the charging interface 12 and the battery module 11, respectively, and is used to detect a first reverse current on the charging path. When the first reverse current is detected on the charging path, the first reverse current on the charging path is cut off. The second anti-reverse module 15 is located on the discharging path. Specifically, the second anti-reverse module 15 is electrically connected to the discharging interface 13 and the battery module 11, respectively, and is used to detect a second reverse current on the discharging path. When the second reverse current is detected on the discharging path, the second reverse current on the discharging path is cut off.

[0044] The working principle of the battery circuit of this embodiment is as follows: the battery circuit sets a first anti-reverse module 14 on the charging path between the battery module 11 and the charging interface 12 to detect the first reverse current on the charging path, and when the first reverse current is detected, the first reverse current on the charging path is promptly cut off. Correspondingly, the battery circuit sets a second anti-reverse module 15 on the discharge path between the battery module 11 and the discharge interface 13, and when the second reverse current is detected, the second reverse current on the discharge path is promptly cut off.

[0045] It can be understood that in this embodiment, the first anti-reverse module 14 and the second anti-reverse module 15 are respectively arranged on the charging path and the discharging path of the battery circuit so that the battery circuit has the function of blocking reverse current during charging and discharging, thereby protecting the battery circuit and external equipment from damage.

[0046] The first reverse current in this embodiment is a current in the opposite direction to the charging current on the charging path of the battery circuit; the second reverse current in this embodiment is a current in the opposite direction to the discharging current on the discharging path of the battery circuit.

[0047] See also Figure 2 and Figure 3 In some embodiments, a charging node E is provided on the connection path between the battery module 11 and the first anti-reverse module 14. The first anti-reverse module 14 includes a first detection unit 142 and a first switch unit 141. The first detection unit 142 is electrically connected to the charging interface 12 and the charging node E, respectively, and is used to detect a first voltage difference between the charging interface 12 and the charging node E, and compare the first voltage difference with a first preset threshold value, and generate a first drive signal according to the comparison result. The first switch unit 141 is electrically connected to the charging node E, the charging interface 12 and the first detection unit 142, respectively, and is used to control the connection state of the charging node E and the charging interface 12 according to the first drive signal.

[0048] When the first voltage difference is greater than a first preset threshold, the first switch unit 141 is turned on, and when the first voltage difference is less than the first preset threshold, the first switch unit 141 is turned off.

[0049] The first voltage difference referred to in this embodiment is a voltage difference obtained by subtracting the potential of the charging node E from the potential of the charging interface 12 , that is, the terminal voltage of the first switch unit 141 .

[0050] In this embodiment, a first detection unit 142 is provided to detect a first voltage difference between the charging interface 12 and the charging node E, and compare the first voltage difference with a first preset threshold value to determine whether there is a first reverse current in the charging path, and output a first driving signal according to the comparison result to control the first switch unit 141. In a normal charging state, the charging interface 12 inputs a charging current, and at this time, the potential of the charging interface 12 is higher than the potential of the charging node E. The first detection unit 142 detects that the first voltage difference is greater than the first preset threshold value, and drives the first switch unit 141 to conduct according to the detection result; in an abnormal charging state, there is a potential of the charging interface 12 lower than the potential of the charging node E (for example, the power supply device has no current output, but forms an effective loop with the battery circuit), so the charging path will generate a reverse impact current, and the first detection unit 142 detects that the first voltage difference is less than the first preset threshold value, and drives the first switch unit 141 to conduct according to the detection result.

[0051] It can be understood that the normal charging working state indicates that the charging node E of the battery module 11 is connected to the positive electrode BAT+ of the battery pack 111, so that the battery pack 111 is connected to the charging current and charged. The abnormal charging state indicates that the charging node E of the battery module 11 is still connected to the positive electrode BAT+ of the battery pack 111, the external device is connected to the charging interface 12 to form a loop, and there is no power supply current input, and at the same time, the potential of the charging interface 12 is lower than the potential of the charging node E. When the charging interface 12 inputs the charging current, since the potential of the charging interface 12 is higher than the potential of the charging node E, the first voltage difference between the charging interface 12 and the charging node E is a positive value; when the charging path generates a first reverse current, the potential of the charging interface 12 is less than the potential of the charging node E, and the first voltage difference is a negative value. Exemplarily, the first detection unit 142 of this embodiment can configure the first preset threshold value to be zero, and when the first voltage difference value is greater than the first preset threshold value, the first switch unit 141 is driven to turn on; when the first voltage difference value is less than the first preset threshold value, the first switch unit 141 is driven to turn off. In other embodiments, the first preset threshold may be adjusted according to a specific circuit.

[0052] Please continue reading Figure 2 and Figure 3 In some embodiments, a discharge node F is provided on the connection path between the battery module 11 and the second anti-reverse module 15. The second anti-reverse module 15 includes a second detection unit 152 and a second switch unit 151. The second detection unit 152 is electrically connected to the discharge interface 13 and the discharge node F, respectively, for detecting a second voltage difference between the discharge node F and the discharge interface 13, and comparing the second voltage difference with a second preset threshold, and generating a second drive signal according to the comparison result. The second switch unit 151 is electrically connected to the discharge node F, the discharge interface 13 and the second detection unit 152, respectively, for controlling the connection state between the discharge node F and the discharge interface 13 according to the second drive signal.

[0053] When the second voltage difference is greater than the second preset threshold, the second switch unit 151 is turned on, and when the second voltage difference is less than the second preset threshold, the second switch unit 151 is turned off.

[0054] The second voltage difference referred to in this embodiment is a voltage difference obtained by subtracting the potential of the discharge interface 13 from the potential of the discharge node F, ie, the terminal voltage of the second switch unit 151 .

[0055] In this embodiment, a second detection unit 152 is provided to detect a second voltage difference between the discharge node F and the discharge interface 13, and compare the second voltage difference with a second preset threshold value to determine whether there is a second reverse current in the discharge path, and output a second driving signal according to the comparison result to control the second switch unit 151. In a normal discharge state, the discharge interface 13 outputs a discharge current, at which time the potential of the discharge node F is higher than the potential of the discharge interface 13, the second detection unit 152 detects that the second voltage difference is greater than the second preset threshold value, and drives the second switch unit 151 to conduct according to the detection result; in an abnormal discharge state, there is a situation where the potential of the discharge node F is lower than the potential of the discharge interface 13 (for example, the power supply device is mistakenly connected to the discharge interface 13), so the discharge path will generate a reverse impact current, the second detection unit 152 detects that the second voltage difference is less than the second preset threshold value, and drives the second switch unit 151 to conduct according to the detection result.

[0056] It can be understood that the normal discharge working state indicates that the discharge node F of the battery module 11 is connected to the positive electrode BAT+ of the battery pack 111, so that the battery pack 111 outputs a discharge current. The abnormal charging state indicates that the discharge node F of the battery module 11 is still connected to the positive electrode BAT+ of the battery pack 111, the external device is connected to the discharge interface 13 to form a loop, and the discharge interface 13 is connected to the current provided by the external device, and at the same time, the potential of the discharge node F is lower than the potential of the discharge interface 13. When the discharge interface 13 outputs the discharge current, since the potential of the discharge node F is higher than the potential of the discharge interface 13, the second voltage difference between the discharge node F and the discharge interface 13 is a positive value; when the discharge path generates a second reverse current, the potential of the discharge node F is less than the potential of the discharge interface 13, and the second voltage difference is a negative value. Exemplarily, the second detection unit 152 of this embodiment can configure the second preset threshold value to be zero, and when the second voltage difference value is greater than the second preset threshold value, the second switch unit 151 is driven to turn on; when the second voltage difference value is less than the second preset threshold value, the second switch unit 151 is driven to turn off. In other embodiments, the second preset threshold may be adjusted according to a specific circuit.

[0057] See also Figure 3 In some embodiments, the first switch unit 141 includes a first field effect transistor Q1, a gate of the first field effect transistor Q1 is connected to the first detection unit 142, a source of the first field effect transistor Q1 is connected to the charging interface 12, and a drain of the first field effect transistor Q1 is connected to the charging node E.

[0058] It can be understood that the first switch unit 141 of this embodiment adopts the first field effect tube Q1, and the first detection unit 142 controls the connection state between the charging node E and the charging interface 12 by driving the first field effect tube Q1 to be turned on and off. The first field effect tube Q1 of this embodiment is an NMOS tube. When the battery circuit is turned on and in a normal charging state, the battery pack 111 in the battery module 11 is connected to the charging node E, and the charging current input by the charging interface 12 is input to the charging node E through the body diode of the first field effect tube Q1. At this time, the first detection unit 142 detects that the first voltage difference between the charging interface 12 and the charging node E is greater than the first preset threshold, and outputs a high level to the gate of the first field effect tube Q1 to drive the first field effect tube Q1 to be turned on, thereby charging the battery pack 111. When the power supply device has no discharge current but still forms an effective loop with the battery circuit, the battery pack 111 of the battery module 11 will generate a first reverse current. The first detection unit 142 detects that the first voltage difference between the charging interface 12 and the charging node E is less than the first preset threshold value, and outputs a low level to the gate of the first field effect transistor Q1, thereby driving the first field effect transistor Q1 to turn off. In this way, the reverse impact current generated by the battery circuit is prevented from continuing to damage the external power supply device, thereby achieving discharge protection for the external device and avoiding safety hazards.

[0059] In some embodiments, the first detection unit 142 includes a first ideal diode U1, an input end (fourth pin) of the first ideal diode U1 is connected to the charging interface 12, an output end (sixth pin) of the first ideal diode U1 is connected to the charging node E, and a driving end (fifth pin) of the first ideal diode U1 is connected to the first switch unit 141. In this embodiment, the input end of the first ideal diode U1 is connected to the source of the first field effect transistor Q1, the output end of the first ideal diode U1 is connected to the drain of the first field effect transistor Q1, and the driving end of the first ideal diode U1 is connected to the gate of the first field effect transistor Q1. The first ideal diode U1 is associated with the first field effect transistor Q1 to detect the information of the battery charging state or reverse current, thereby realizing effective control of charging and reverse current, and ensuring the normal operation and safety of the battery system.

[0060] In this embodiment, the ideal diode is a device with zero forward voltage drop and zero reverse leakage current, and is usually implemented using an integrated circuit. By way of example, the ideal diode of this embodiment can be an existing transistor integrated circuit composed of a field effect transistor or the like.

[0061] It can be understood that the first ideal diode U1 of this embodiment samples the potential of the charging interface 12 through its input end, and samples the potential of the charging node E through its output end, so as to obtain a first voltage difference between the charging interface 12 and the charging node E. The first ideal diode U1 also compares the first voltage difference with a first preset threshold value, and outputs a corresponding first driving signal to the gate of the first field effect transistor Q1 through the driving end according to the comparison result.

[0062] In other embodiments, the first detection unit 142 includes a sampling circuit and a comparison circuit, the sampling circuit samples the first voltage difference between the charging interface 12 and the charging node E, and the comparison circuit compares the first voltage difference with the first preset threshold, and outputs a corresponding first driving signal according to the comparison result. The sampling circuit and the comparison circuit can use existing circuits and existing electronic components, which are not limited here.

[0063] Please continue reading Figure 3 In some embodiments, the second switch unit 151 includes a second field effect transistor Q2, a gate of the second field effect transistor Q2 is connected to the second detection unit 152, a source of the second field effect transistor Q2 is connected to the discharge node F, and a drain of the second field effect transistor Q2 is connected to the discharge interface 13.

[0064] It can be understood that the second switch unit 151 of this embodiment adopts the second field effect tube Q2, and the second detection unit 152 controls the connection state between the charging node E and the charging interface 12 by driving the second field effect tube Q2 to be turned on and off. The first field effect tube Q1 of this embodiment is an NMOS tube. When the battery circuit is turned on and in a normal discharge state, the battery pack 111 in the battery module 11 is connected to the discharge node F, and the battery pack 111 outputs the discharge current through the discharge node F, and outputs it to the discharge interface 13 through the body diode of the second field effect tube Q2. At this time, the second detection unit 152 detects that the second voltage difference between the discharge node F and the discharge interface 13 is greater than the second preset threshold, and outputs a high level to the gate of the second field effect tube Q2 to drive the second field effect tube Q2 to be turned on, thereby discharging for the external device. Exemplarily, when the power supply device is mistakenly connected to the discharge interface 13, the discharge path will generate a second reverse current. The second detection unit 152 detects that the second voltage difference between the discharge node F and the discharge interface 13 is less than the second preset threshold, and outputs a low level to the gate of the second field effect transistor Q2, thereby driving the second field effect transistor Q2 to turn off. In this way, the impact current of the external power supply device is prevented from continuing to damage the battery circuit.

[0065] In some embodiments, the second detection unit 152 includes a second ideal diode U2, the input end (fourth pin) of the second ideal diode U2 is connected to the discharge node F, the output end (sixth pin) of the second ideal diode U2 is connected to the discharge interface 13, and the driving end (fifth pin) of the second ideal diode U2 is connected to the second switch unit 151. In this embodiment, the input end of the second ideal diode U2 is connected to the source of the second field effect transistor Q2, the output end of the second ideal diode U2 is connected to the drain of the second field effect transistor Q2, and the driving end of the second ideal diode U2 is connected to the gate of the second field effect transistor Q2. The second ideal diode U2 is associated with the second field effect transistor Q2 to detect the information of the battery discharge state or reverse current, so as to achieve effective control of the discharge and reverse current, and further ensure the normal operation and safety of the battery system.

[0066] It can be understood that the second ideal diode U2 of this embodiment samples the potential of the discharge node F through its input end and samples the potential of the discharge interface 13 through its output end to obtain the second voltage difference between the discharge node F and the discharge interface 13. The second ideal diode U2 also compares the second voltage difference with the second preset threshold value, and outputs a corresponding second drive signal to the gate of the second field effect transistor Q2 through the drive end according to the comparison result.

[0067] In other embodiments, the second detection unit 152 includes another sampling circuit and another comparison circuit, and the sampling circuit samples the second voltage difference between the discharge node F and the discharge interface 13, and compares the second voltage difference with the second preset threshold value through the comparison circuit, and outputs a corresponding second driving signal according to the comparison result. Accordingly, in the second detection unit 152, the sampling circuit and the comparison circuit can also use existing circuits and existing electronic components, which are not limited here.

[0068] This embodiment is based on field effect tubes and ideal diodes to set up a first anti-reverse module 14 and a second anti-reverse module 15 to prevent reverse current on the charging path and the discharging path respectively, to achieve protection of the battery circuit against reverse current, and to use an ideal diode to drive the field effect tube to be turned on and off, which is suitable for high current application scenarios. Since the battery circuit of this embodiment can achieve reverse current protection only in hardware, it has higher working stability compared to the anti-reverse method implemented by software. In addition, compared with the existing method of using an anti-reverse diode to block reverse current, the method of driving the field effect tube with an ideal diode in this embodiment has a smaller voltage drop, and its power consumption and heat generation are both smaller than those of the anti-reverse diode.

[0069] See also Figure 3 and Figure 4In some embodiments, the battery module 11 includes a battery pack 111, a sampling unit 112, a battery management unit 113, a charging switch unit 114, and a discharging switch unit 115. The sampling unit 112 is connected to the battery pack 111, and is used to obtain the electrical parameters and temperature parameters of the battery pack 111. The battery management unit 113 is electrically connected to the sampling unit 112, and is used to generate a third drive signal and a fourth drive signal, and adjust the third drive signal and the fourth drive signal according to the electrical parameters and temperature parameters of the battery pack 111. The charging switch unit 114 is electrically connected to the battery management unit 113, the battery pack 111, and the first anti-reverse module 14, respectively, and is used to turn on or off according to the third drive signal to control the connection state of the battery pack 111 and the first anti-reverse module 14. The discharging switch unit 115 is electrically connected to the battery management unit 113, the battery pack 111, and the second anti-reverse module 15, respectively, and is used to turn on or off according to the fourth drive signal to control the connection state of the battery pack 111 and the second anti-reverse module 15.

[0070] It can be understood that the battery management unit 113 controls the charging and discharging process of the battery circuit by generating the third drive signal and the fourth drive signal to drive the charging switch unit 114 and the discharging switch unit 115 respectively. In addition, the electrical parameters of the battery pack 111 are obtained through the sampling circuit, and the third drive signal and the fourth drive signal are adjusted when the battery pack 111 is abnormal to turn off the charging switch unit 114 and the discharging switch unit 115, thereby protecting the battery circuit and external devices.

[0071] In this embodiment, the battery pack 111 includes battery cells connected in series or in parallel, and may also include battery cells connected in series or in parallel. The sampling unit 112 includes a current detection resistor SENSE1 and a temperature sensor RT1. The battery circuit also includes a negative electrode interface PACK-. One end of the current detection resistor SENSE1 is respectively connected to the negative electrode BAT- of the battery pack 111 and the battery management unit 113. The other end of the current detection resistor SENSE1 is respectively connected to the negative electrode interface PACK- of the battery management unit 113, and is used to detect the current parameters in the main circuit of the battery circuit. The temperature sensor RT1 is arranged inside the battery pack 111 to detect the temperature of the battery pack 111. By way of example, the temperature sensor RT1 can be a thermistor. The battery management unit 113 includes a battery management chip U3, which is connected to both ends of the current detection resistor SENSE1, the temperature sensor RT1 and each cell in the battery pack 111 to respectively obtain the current parameter, temperature parameter and voltage parameter of each cell of the battery pack 111, and determine whether the battery pack 111 is over-voltage, over-current or short-circuited according to the current parameter and voltage parameter, and determine whether the battery pack 111 is over-temperature according to the temperature parameter. When the battery management unit 113 detects that the battery pack 111 has one of the abnormal conditions of over-voltage, over-current, short-circuit, over-temperature, etc., the third drive signal and the fourth drive signal are adjusted in time to turn off the charging switch unit 114 and the discharging switch unit 115, thereby protecting the battery circuit and external devices.

[0072] In some embodiments, the charging switch unit 114 includes a third field effect transistor Q3, the gate of the third field effect transistor Q3 is connected to the battery management unit 113, the source of the third field effect transistor Q3 is connected to the positive electrode BAT+ of the battery pack 111, and the drain of the third field effect transistor Q3 is connected to the first anti-reverse module 14. The discharging switch unit 115 includes a fourth field effect transistor Q4, the gate of the fourth field effect transistor Q4 is connected to the battery management unit 113, the source of the fourth field effect transistor Q4 is connected to the second anti-reverse module 15, and the drain of the fourth field effect transistor Q4 is connected to the positive electrode BAT+ of the battery pack 111.

[0073] The third field effect transistor Q3 and the fourth field effect transistor Q4 of this embodiment are both NMOS transistors. When the third driving signal output by the battery management unit 113 is at a high level, the third field effect transistor Q3 is turned on, and the positive electrode BAT+ of the battery pack 111 is electrically connected to the charging node E; when the third driving signal output by the battery management unit 113 is at a low level, the third field effect transistor Q3 is turned off, and the positive electrode BAT+ of the battery pack 111 is disconnected from the charging node E. Correspondingly, when the fourth driving signal output by the battery management unit 113 is at a high level, the fourth field effect transistor Q4 is turned on, and the positive electrode BAT+ of the battery pack 111 is electrically connected to the discharge node F; when the fourth driving signal output by the battery management unit 113 is at a low level, the fourth field effect transistor Q4 is turned off, and the positive electrode BAT+ of the battery pack 111 is disconnected from the discharge node F.

[0074] It can be understood that the battery management unit 113 controls the on and off of the charging function of the battery circuit by controlling the on and off of the third field effect transistor Q3, and also controls the on and off of the discharging function of the battery circuit by controlling the on and off of the fourth field effect transistor Q4.

[0075] This embodiment also provides an electronic device, including the battery circuit as described above. The electronic device may be an electric car, a laptop computer, etc.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention is described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery circuit, characterized in that: include: A battery module, used for charging and / or discharging, wherein the battery module is provided with a charging path and a discharging path; An interface module, used to connect an external device, the interface module comprising a charging interface located on the charging path and a discharging interface located on the discharging path; A first reverse current prevention module is located on the charging path and is used to detect a first reverse current on the charging path and, when detecting the first reverse current on the charging path, cut off the first reverse current on the charging path; as well as The second reverse protection module is located on the discharge path and is used to detect a second reverse current on the discharge path and cut off the second reverse current on the discharge path when the second reverse current is detected on the discharge path.

2. The battery circuit according to claim 1, characterized in that: A charging node is provided on the connection path between the battery module and the first anti-reverse module; The first anti-reverse module comprises: a first detection unit, electrically connected to the charging interface and the charging node, respectively, for detecting a first voltage difference between the charging interface and the charging node, and comparing the first voltage difference with a first preset threshold value, and generating a first driving signal according to the comparison result; and a first switch unit, electrically connected to the charging node, the charging interface and the first detection unit, respectively, and configured to control a connection state between the charging node and the charging interface according to the first driving signal; When the first voltage difference is greater than the first preset threshold, the first switch unit is turned on, and when the first voltage difference is less than the first preset threshold, the first switch unit is turned off.

3. The battery circuit according to claim 1, characterized in that: A discharge node is provided on the connection path between the battery module and the second anti-reverse module; The second anti-reverse module comprises: a second detection unit, electrically connected to the discharge interface and the discharge node, respectively, for detecting a second voltage difference between the discharge node and the discharge interface, and comparing the second voltage difference with a second preset threshold value, and generating a second driving signal according to the comparison result; and a second switch unit, electrically connected to the discharge node, the discharge interface and the second detection unit, respectively, and configured to control a connection state between the discharge node and the discharge interface according to the second driving signal; When the second voltage difference is greater than the second preset threshold, the second switch unit is turned on, and when the second voltage difference is less than the second preset threshold, the second switch unit is turned off.

4. The battery circuit according to claim 2, characterized in that: The first switch unit includes a first field effect transistor, a gate of the first field effect transistor is connected to the first detection unit, a source of the first field effect transistor is connected to the charging interface, and a drain of the first field effect transistor is connected to the charging node.

5. The battery circuit according to claim 2, characterized in that: The first detection unit includes a first ideal diode, an input end of the first ideal diode is connected to the charging interface, an output end of the first ideal diode is connected to the charging node, and a driving end of the first ideal diode is connected to the first switch unit.

6. The battery circuit according to claim 3, characterized in that: The second switch unit includes a second field effect transistor, a gate of the second field effect transistor is connected to the second detection unit, a source of the second field effect transistor is connected to the discharge node, and a drain of the second field effect transistor is connected to the discharge interface.

7. The battery circuit according to claim 3, characterized in that: The second detection unit includes a second ideal diode, an input end of the second ideal diode is connected to the discharge node, an output end of the second ideal diode is connected to the discharge interface, and a driving end of the second ideal diode is connected to the second switch unit.

8. The battery circuit according to claim 1, characterized in that: The battery module comprises: Battery pack; A sampling unit, connected to the battery pack, for obtaining electrical parameters and temperature parameters of the battery pack; a battery management unit, electrically connected to the sampling unit, configured to generate a third driving signal and a fourth driving signal, and adjust the third driving signal and the fourth driving signal according to the electrical parameter and the temperature parameter of the battery pack; a charging switch unit, electrically connected to the battery management unit, the battery pack and the first anti-reverse module, respectively, and configured to be turned on or off according to the third driving signal to control the connection state between the battery pack and the first anti-reverse module; and A discharge switch unit is electrically connected to the battery management unit, the battery pack and the second anti-reverse module respectively, and is used to be turned on or off according to the fourth driving signal to control the connection state of the battery pack and the second anti-reverse module.

9. The battery circuit according to claim 8, characterized in that: The charging switch unit includes a third field effect tube, the gate of the third field effect tube is connected to the battery management unit, the source of the third field effect tube is connected to the positive electrode of the battery pack, and the drain of the third field effect tube is connected to the first anti-reverse module; The discharge switch unit includes a fourth field effect transistor, a gate of the fourth field effect transistor is connected to the battery management unit, a source of the fourth field effect transistor is connected to the second anti-reverse module, and a drain of the fourth field effect transistor is connected to the positive electrode of the battery pack.

10. An electronic device, characterized in that: Comprising a battery circuit as claimed in any one of claims 1 to 9.

Images