A power supply control circuit, a BMS protection board and a power supply device

Abstract

The application provides a power supply control circuit, a BMS protection board and a power supply device, relates to the technical field of electronics, is arranged between a connector and a battery cell, the connector and the battery cell include a positive power transmission line and a negative power transmission line, the power supply control circuit comprises: a protection integrated subcircuit and a switch subcircuit, a collection end of the protection integrated subcircuit is connected to the positive power transmission line to collect the battery cell voltage, and a signal output end of the protection integrated subcircuit is connected to a control end of the switch subcircuit; the switch subcircuit is arranged on the negative power transmission line, and the switch subcircuit is used for controlling the on-off of the negative power transmission line; the protection integrated subcircuit comprises a controllable boost structure; when the battery cell voltage meets a preset trigger condition, the protection integrated subcircuit sends a trigger signal to the controllable boost structure; the controllable boost structure is triggered to start boosting, so that the switch subcircuit is in a conduction state. Through the application, the controllable boost structure controls the on-off of the switch subcircuit.

Description

Technical Field

[0001] This application relates to the field of electronic technology, and in particular to a power supply control circuit, a BMS protection board, and a power supply device. Background Technology

[0002] As various electronic devices, such as terminals, drones, and automobiles, continue to develop, the number of built-in or configured electronic modules is constantly increasing. Consequently, the requirements for batteries in these devices are becoming increasingly stringent. For example, in order to ensure the normal operation of these devices, batteries need to provide increasingly higher voltages, which is typically achieved by configuring multiple batteries in series to guarantee power supply.

[0003] Based on the above, current high-voltage batteries place higher demands on power supply control circuits. Specifically, the power supply control circuit is responsible for maintaining the battery's charging and discharging circuits, including short-circuit protection, over-temperature and under-temperature protection. Conventional lithium battery negative terminal protection circuits have the following inherent defects:

[0004] Excessive temperature rise during low-voltage fast charging: When the battery is in a low-voltage state (such as the initial stage of fast charging), the charging current reaches its maximum value. However, the gate-source voltage of the MOSFET increases significantly due to the low output voltage of the protection circuit, causing the MOSFET to heat up rapidly and the temperature rise rate is too fast.

[0005] No voltage regulation capability: The existing protection circuit cannot adjust the drive voltage according to the battery status, and cannot optimize the operating conditions of the MOSFET during low-voltage charging.

[0006] These defects make it difficult to control the temperature rise during the initial stage of low-voltage fast charging, affecting battery safety. Utility Model Content

[0007] In view of this, this application provides a power supply control circuit, a BMS protection board, and a power supply device to overcome the deficiencies of at least one of the above aspects.

[0008] In a first aspect, embodiments of this application provide a power supply control circuit disposed between a connector and a battery cell. The connector and the battery cell include a positive power transmission line and a negative power transmission line. The power supply control circuit includes a protection integrated sub-circuit and a switching sub-circuit. The acquisition terminal of the protection integrated sub-circuit is connected to the positive power transmission line to acquire the battery cell voltage. The signal output terminal of the protection integrated sub-circuit is connected to the control terminal of the switching sub-circuit. The switching sub-circuit is disposed on the negative power transmission line and is used to control the on / off state of the negative power transmission line. The protection integrated sub-circuit includes a controllable boost structure. When the battery cell voltage meets a preset trigger condition, the protection integrated sub-circuit sends a trigger signal to the controllable boost structure to boost the voltage, thereby putting the switching sub-circuit in a conducting state.

[0009] Preferably, the connector includes a positive terminal and a negative terminal, the battery cell includes a positive terminal and a negative terminal; the switching sub-circuit includes a first field-effect transistor (FET) and a second field-effect transistor (FET), wherein the gate of the first FET is connected to the signal output terminal of the protection integrated sub-circuit, the source of the first FET is connected to the negative terminal of the battery cell, the drain of the first FET is connected to the drain of the second FET, the gate of the second FET is connected to the signal output terminal of the protection integrated sub-circuit, and the source of the second FET is connected to the negative terminal.

[0010] Preferably, the power supply control circuit further includes a first capacitor and a first resistor, wherein one end of the first capacitor is connected to the positive power transmission line and the other end of the first capacitor is grounded; one end of the first resistor is connected to the positive power transmission line and the other end of the first resistor is connected to one end of the first capacitor.

[0011] Preferably, the connector is used to connect to an external power source during charging, so that the electrical energy input from the external power source is converted by the power supply control circuit and transmitted to the battery cell; the connector is also used to connect to a load device during discharging, so that the electrical energy of the battery cell is output to the load device via the power supply control circuit.

[0012] Preferably, the power supply control circuit further includes a second resistor, a second capacitor, and a third capacitor, wherein one end of the second resistor is connected to the voltage output terminal of the protection integrated sub-circuit, and the other end of the second resistor is connected to a preset terminal of the switching sub-circuit, the preset terminal being the end of the switching sub-circuit closest to the connector; one end of the second capacitor is connected to the first source of the first field-effect transistor, the other end of the second capacitor is connected to one end of the third capacitor, and the other end of the third capacitor is connected to the second source of the second field-effect transistor.

[0013] Preferably, the power supply control circuit further includes a fourth capacitor and a fifth capacitor. One end of the fourth capacitor is connected to the positive power transmission line, and the other end of the fourth capacitor is connected to one end of the fifth capacitor. The other end of the fifth capacitor is connected between the preset terminal of the switch sub-circuit and the connector.

[0014] Preferably, the power supply control circuit further includes an identification resistor, one end of which is connected between a preset terminal of the switch sub-circuit and the connector, and the other end of which is connected to the identification terminal of the connector.

[0015] Preferably, the power supply control circuit further includes a thermistor, one end of which is connected between the preset terminal of the switch sub-circuit and the connector, and the other end of which is connected to the temperature detection terminal of the connector.

[0016] Secondly, embodiments of this application also provide a BMS protection board, the BMS protection board including the power supply control circuit as described in any of the above claims.

[0017] Thirdly, embodiments of this application also provide a power supply device, including a battery cell and the aforementioned BMS protection board.

[0018] The power supply control circuit, BMS protection board, and power supply equipment provided in this application are located between the connector and the battery cell. The connection between the connector and the battery cell includes a positive power transmission line and a negative power transmission line. The power supply control circuit includes a protection integrated sub-circuit and a switching sub-circuit. The acquisition terminal of the protection integrated sub-circuit is connected to the positive power transmission line to acquire the battery cell voltage. The signal output terminal of the protection integrated sub-circuit is connected to the control terminal of the switching sub-circuit. The switching sub-circuit is located on the negative power transmission line and is used to control the on / off state of the negative power transmission line. The protection integrated sub-circuit includes a controllable boost structure. When the battery cell voltage meets a preset trigger condition, the protection integrated sub-circuit sends a trigger signal to the controllable boost structure to trigger the boost structure to turn on, thus putting the switching sub-circuit in a conducting state. Through this application, the controllable boost structure of the protection integrated sub-circuit controls the on / off state of the switching sub-circuit.

[0019] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 One of the schematic diagrams of the power supply control circuit provided in the embodiments of this application;

[0022] Figure 2 This is a second schematic diagram of the power supply control circuit provided in an embodiment of this application.

[0023] Figure reference numerals: 1-Protection integrated circuit; 2-Switch circuit; Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0025] In the description of the embodiments of this application, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of the embodiments of this application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] With the development of electrical equipment, the requirements for batteries are becoming more stringent. Currently, the conventional battery negative terminal protection is designed with a protection circuit and a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor). Because the hardware circuit design of the protection circuit can only output an output voltage of the same magnitude as the current cell voltage, the charging current is the largest when the battery is under low voltage. Furthermore, the input voltage of the MOSFET is affected by the low output voltage, which leads to an increase in the on-resistance and causes the temperature rise to be too fast during low-voltage fast charging.

[0029] In summary, conventional lithium battery negative terminal protection circuits have inherent defects: First, the temperature rise during low-voltage fast charging is too high. In the initial stage of fast charging, the low output voltage of the protection circuit leads to a low gate-source voltage and increased on-resistance of the MOSFET, resulting in rapid heat generation. Second, they lack dynamic voltage regulation capability, failing to adjust the drive voltage according to the battery status and making it difficult to optimize the MOSFET's operating conditions during low-voltage charging. These defects make temperature rise control difficult in the initial stage of low-voltage fast charging, affecting battery safety.

[0030] To address at least one of the aforementioned problems, embodiments of this application provide a power supply control circuit, a BMS protection board, and a power supply device, aiming to solve at least one problem of excessive temperature rise and lack of voltage regulation capability in conventional lithium battery negative terminal protection circuits during low-voltage fast charging. Specific embodiments are described below.

[0031] Example:

[0032] Figure 1 This is a schematic diagram of one of the power supply control circuits provided in an embodiment of this application.

[0033] like Figure 1 As shown, the power supply control circuit provided in this embodiment includes a protection integrated sub-circuit 1 and a switching sub-circuit 2.

[0034] Specifically, the power supply control circuit is located between the connector and the battery cell. The connection between the connector and the battery cell includes a positive power transmission line and a negative power transmission line. The power supply control circuit includes a protection integrated sub-circuit 1 and a switch sub-circuit 2. The acquisition terminal of the protection integrated sub-circuit 1 is connected to the positive power transmission line to acquire the battery cell voltage on the positive power transmission line. The signal output terminal of the protection integrated sub-circuit 1 is connected to the control terminal of the switch sub-circuit 2. The switch sub-circuit 2 is located on the negative power transmission line and is used to control the on / off state of the negative power transmission line.

[0035] Among them, the protection integrated sub-circuit 1 and the switch sub-circuit 2 are set between the positive and negative terminals (B+ / B-) of the battery cell and the positive and negative interfaces of the connector. The protection integrated sub-circuit 1 collects the battery cell voltage on the positive power transmission line and can monitor the electrical signal status between the positive and negative terminals of the battery cell and the positive and negative interfaces to ensure the safe use of the battery.

[0036] Here, the acquisition terminal of the protection integrated circuit 1 is connected to the positive power transmission line (B+) to directly acquire the analog signal of the cell voltage, and the signal output terminal is connected to the control terminal of the switch circuit 2 to output the drive voltage signal to the switch circuit 2.

[0037] The control terminal of the switch sub-circuit 2 receives the drive voltage signal output by the protection integrated sub-circuit 1 and changes the on / off state of the switch sub-circuit 2.

[0038] Specifically, the connector is used to connect to an external power source during charging, so that the electrical energy input from the external power source is converted by the power supply control circuit and transmitted to the battery cell; the connector is also used to connect to a load device during discharging, so that the electrical energy of the battery cell is output to the load device through the power supply control circuit. The connector includes a positive terminal and a negative terminal, and the battery cell includes a positive terminal and a negative terminal. The connection line between the positive terminal P+ and the positive terminal B+ of the battery cell is a positive power transmission line, and the connection line between the negative terminal P- and the negative terminal B- of the battery cell is a negative power transmission line.

[0039] Here, the positive terminal of the connector is connected to the positive terminal of the external device to form an external current input / output interface, and the negative terminal is connected to the negative terminal of the external device to form an external current loop interface.

[0040] The positive terminal of the battery cell outputs the positive potential of the battery; the negative terminal outputs the negative potential of the battery.

[0041] The positive terminal B+ of the battery cell is connected to the positive power transmission line to provide the battery voltage source, and the negative terminal B- is connected to the negative power transmission line to form a current loop.

[0042] Specifically, the protection integrated sub-circuit 1 includes a controllable boost structure. The input terminal of the controllable boost structure is connected to the acquisition terminal of the protection integrated sub-circuit 1, and the output terminal of the controllable boost structure is connected to the signal output terminal of the protection integrated sub-circuit 1. When the cell voltage meets the preset trigger condition, the protection integrated sub-circuit 1 sends a trigger signal to the controllable boost structure to trigger the controllable boost structure to start boosting, so that the switching sub-circuit 2 is in the conducting state.

[0043] Optionally, in some other situations, such as when the cell voltage returns to normal and is within the safe operating voltage range, or when the circuit system enters a low-power standby mode and does not require additional boost to keep the switching sub-circuit 2 on, the protection integrated sub-circuit 1 can keep the controllable boost structure in the off state. At this time, the control voltage output to the switching sub-circuit 2 is equal to the cell voltage, avoiding unnecessary energy loss and ensuring the stable operation of the circuit under normal conditions.

[0044] Here, the acquisition terminal of the protection integrated circuit 1 samples the cell voltage, detects the cell voltage, and checks whether the cell voltage meets the preset trigger conditions. These trigger conditions can be determined according to different protection functions.

[0045] For example, for short-circuit protection, the corresponding trigger condition can be set to the electrical signal magnitude being greater than a preset value; for overvoltage protection, the corresponding trigger condition can be set to the cell voltage exceeding a preset upper limit value, etc.

[0046] Specifically, when the short-circuit protection function is triggered, the current in the circuit increases sharply due to the short circuit. According to Ohm's law, the voltage-related electrical signal on the positive power transmission line will show abnormal changes. The protection integrated circuit acquisition terminal detects that this electrical signal is greater than a preset value, determines that the short-circuit protection trigger condition is met, and then sends a trigger signal to the controllable boost structure. The controllable boost structure starts boosting, raising the voltage to a level sufficient to drive the switching sub-circuit, turning on the switching sub-circuit, and thus connecting the negative power transmission line, providing a path for the subsequent short-circuit path disconnection protection action.

[0047] When the protection integrated circuit 1 detects that the cell voltage meets the trigger condition, it indicates that the switch sub-circuit 2 needs to be protected. Accordingly, the protection integrated circuit 1 will send a trigger signal to the controllable boost structure. The controllable boost structure will increase the cell voltage according to the trigger signal to obtain the target voltage after the increase. This ensures that the voltage received by the switch sub-circuit 2 is the target voltage, thus preventing the switch sub-circuit 2 from receiving too low a voltage, which would cause the on-resistance to increase and the MOSFET to heat up rapidly. This achieves the effect of protecting the switch sub-circuit 2.

[0048] In one optional embodiment, the controllable boost structure is used to boost the voltage of the signal received at the input terminal and then output it. It can take various forms, for example, it can be a boost chip or a boost circuit.

[0049] Figure 2 A second schematic diagram of the power supply control circuit provided in an embodiment of this application is shown.

[0050] like Figure 2 As shown, the power supply control circuit also includes a first capacitor C1, a first resistor R1, a field-effect transistor, a second capacitor C2, a third capacitor C3, a second resistor R2, a fourth capacitor C4, a fifth capacitor C5, an identification resistor R4, and a thermistor R5.

[0051] Figure 2 CELL in this context refers to a battery cell.

[0052] Specifically, one end of the first capacitor C1 is connected to the positive power transmission line, and the other end of the first capacitor C1 is grounded; one end of the first resistor R1 is connected to the positive power transmission line, and the other end of the first resistor R1 is connected to one end of the first capacitor.

[0053] Here, one end of the first capacitor C1 is connected to the positive power transmission line B+ through a conductor, and the other end of the first capacitor C1 is grounded through a conductor, forming an electric field between the positive power transmission line and the ground. By charging and discharging, it responds to the instantaneous voltage change of the positive power transmission line and maintains the relative stability of the potential difference between the two ends.

[0054] One end of the first resistor R1 is connected to the positive power transmission line B+ through a conductor, and the other end of the first resistor R1 is connected to one end of C1 and the acquisition terminal (VDD pin) of the protection integrated circuit 1 through a conductor. According to Ohm's law (physical law), it impedes the current flowing through itself, physically reducing the current amplitude. When the current flows, a voltage drop is physically generated across its two ends due to its resistance characteristics.

[0055] Specifically, the switching sub-circuit 2 includes a first field-effect transistor and a second field-effect transistor. The gate of the first field-effect transistor is connected to the signal output terminal of the protection integrated sub-circuit 1, the source of the first field-effect transistor is connected to the negative terminal of the battery cell output terminal, the drain of the first field-effect transistor is connected to the drain of the second field-effect transistor, the gate of the second field-effect transistor is connected to the signal output terminal of the protection integrated sub-circuit, and the source of the second field-effect transistor is connected to the negative terminal pin.

[0056] Here, the signal output terminals of the protection integrated circuit 1 include the COUT pin and the DOUT output pin.

[0057] The COUT pin (Charge OUT, charging control output pin) is used to control the on / off state of the charging path. When the battery is in a normal charging state, it outputs a high-level signal; when an abnormal charging state such as overcharge or short circuit is detected, it outputs a low-level signal, cuts off the charging control MOSFET, disconnects the charging circuit, and protects the battery.

[0058] The DOUT pin (Discharge OUT, discharge control output pin) is used to control the on / off state of the discharge path. When the battery is in a normal discharge state, it outputs a high-level signal; when abnormal discharge states such as over-discharge or short circuit are detected, it outputs a low-level signal, cuts off the discharge control MOSFET, and disconnects the discharge circuit to prevent the battery from being over-discharged or damaged by a short circuit.

[0059] One end of the second capacitor is connected to the first source of the first field-effect transistor, the other end of the second capacitor is connected to one end of the third capacitor, and the other end of the third capacitor is connected to the second source of the second field-effect transistor.

[0060] The second capacitor C2 and the third capacitor C3 are connected to S1 and S2, and mainly play the role of filtering and stabilizing voltage. They can filter out high-frequency noise in the circuit, make the source voltage of the field-effect transistor more stable, reduce the impact of voltage fluctuations on the circuit, ensure that the field-effect transistor works in a stable voltage environment, and make the circuit more reliable and stable.

[0061] One end of the second resistor R2 is connected to the voltage output terminal V- of the protection integrated circuit 1, and the other end of the second resistor R2 is connected to the preset terminal of the switch circuit 2.

[0062] Here, the preset end is the end of the switch sub-circuit 2 closest to the connector.

[0063] The second resistor R2 forms a voltage detection loop in the power supply control circuit, which provides a short-circuit fault identification signal by monitoring the voltage status of the output terminal of the protection integrated circuit 1.

[0064] One end of the fourth capacitor C4 is connected to the positive power transmission line, and the other end of the fourth capacitor C4 is connected to one end of the fifth capacitor C5. The other end of the fifth capacitor C5 is connected between the preset terminal of the switch sub-circuit 2 and the connector.

[0065] The fourth capacitor C4 and the fifth capacitor C5 form a parallel filter circuit to filter high-frequency noise in the power transmission path; at the same time, they are connected across the positive and negative power lines to provide an electrostatic discharge path for electrostatic protection.

[0066] One end of the identification resistor R4 is connected between the preset terminal of the switch sub-circuit 2 and the connector, and the other end of the identification resistor R4 is connected to the identification terminal ID of the connector.

[0067] The identification resistor R4 provides an identifiable resistance value signal to external devices for battery identification or type matching.

[0068] One end of the thermistor R5 is connected between the preset terminal of the switch sub-circuit 2 and the connector, and the other end of the thermistor R5 is connected to the temperature detection terminal PH of the connector.

[0069] Thermistor R5 converts temperature changes into resistance changes and outputs a temperature sensing signal to the connector.

[0070] Figure 2 The circuit also includes a fuse element PHC1. In this circuit, when an unexpected high current occurs, the PHC1 fuse blows, disconnecting the battery from the external circuit and preventing damage to the battery or other components due to overcurrent.

[0071] This application encapsulates the power supply control circuit described above to form a BMS protection board. The positive terminal P+, negative terminal P-, identification terminal ID, and temperature detection terminal PH of the connector are connected outside the package to supply power to external devices.

[0072] In one optional embodiment, the connector has ten pins, of which the positive terminal P+ has three pins, the negative terminal P- has three pins, the identification terminal ID has two pins, and the temperature detection terminal PH has two pins.

[0073] According to the charging and discharging state of the battery, this application opens the controllable boost structure of the protection integrated circuit 1 when the battery is charging at low voltage, raises the output voltage of COUT and DOUT, and reduces the internal resistance of MOS. When the battery is discharging, the controllable boost structure is turned off, reducing the self-discharge of the power supply control circuit, thereby better controlling the conduction internal resistance of MOS and achieving the effect of reducing the temperature rise of low-voltage fast charging.

[0074] Specifically, the core of this application is to provide a power supply control circuit, a BMS protection board, and a power supply device, including a protection integrated sub-circuit and a switching sub-circuit. The protection integrated sub-circuit has a built-in controllable boost structure, which optimizes the operating conditions of the field-effect transistor (MOSFET) by monitoring the cell voltage in real time and dynamically adjusting the output drive voltage, thereby achieving temperature rise control during the low-voltage stage and normal protection during the high-voltage stage, while reducing self-discharge during the discharge state.

[0075] The operation process of the protection integrated circuit and controllable boost structure during charging is as follows:

[0076] In one optional embodiment, during the low-voltage charging stage, the protection integrated circuit acquires the cell voltage signal in real time through the voltage acquisition terminal (VDD). When the built-in hardware voltage comparator detects that the VDD terminal is less than a first preset threshold, it determines that the cell voltage meets the preset trigger condition. The voltage comparator outputs a high-level enable signal, and the controllable boost structure is activated, converting the input voltage (VDD) into a first boost signal. For example, the first preset threshold can be 3.8V, and the first boost signal can be 4.5V.

[0077] Here, the first boost signal is directly output to the DOUT and COUT pins to increase the drive voltage of the gate of the field-effect transistor.

[0078] In another optional embodiment, during the high-voltage charging stage, when the voltage comparator detects that the input voltage (VDD) is greater than or equal to the second preset threshold, it outputs a low-level signal, shuts down the controllable boost structure, and the voltages of the DOUT and COUT pins automatically drop back to the VDD level (equivalent to the cell voltage).

[0079] The controllable boost structure is fully triggered by the voltage comparator hardware, without the participation of a timing controller.

[0080] The operation process of protecting integrated circuits and devices during discharge:

[0081] The protection integrated circuit confirms the current flow to the load (discharge state) through the VDD-VSS voltage difference polarity. The protection integrated circuit outputs a lockout signal, and the controllable boost structure remains in the off state (regardless of the VDD voltage value). The DOUT and COUT pins directly output the VDD voltage to the gate of the field-effect transistor.

[0082] Here, the voltage comparator and the controllable boost structure are linked by a pure hardware mechanism; in the discharge state, the power supply of the controllable boost structure is directly locked by the voltage difference polarity (without software judgment).

[0083] This application also provides a BMS protection board, which includes the power supply control circuit as described in any of the preceding claims.

[0084] This application also provides a power supply device, including a battery cell and the aforementioned BMS protection board.

[0085] This application provides a power supply control circuit, a BMS protection board, and a power supply device. The power supply control circuit includes a protection integrated sub-circuit and a switching sub-circuit. The acquisition terminal of the protection integrated sub-circuit is connected to the positive power transmission line to acquire the cell voltage. The signal output terminal of the protection integrated sub-circuit is connected to the control terminal of the switching sub-circuit. The switching sub-circuit is located on the negative power transmission line and is used to control the on / off state of the negative power transmission line. The protection integrated sub-circuit includes a controllable boost structure. When the cell voltage meets a preset trigger condition, the protection integrated sub-circuit sends a trigger signal to the controllable boost structure to trigger the boost structure to start the boost, thus putting the switching sub-circuit in a conducting state. Through this application, the controllable boost structure of the protection integrated sub-circuit controls the on / off state of the switching sub-circuit, solving the problem of rapid temperature rise in the switching sub-circuit due to excessively low voltage and excessively high internal resistance.

[0086] The protection integrated circuit 1 of this application has a controllable boost structure based on the battery voltage and charge / discharge status switch, which can reduce the temperature rise when the battery is charging at low voltage and reduce the self-discharge when the battery is discharging. The protection integrated circuit 1 has a built-in controllable boost structure hardware circuit design, and the protection integrated circuit 1 protects the field-effect transistor based on the controllable boost structure based on the battery voltage and charge / discharge status switch.

[0087] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The scope of protection of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims.

Claims

1. A power supply control circuit, characterized in that, Located between the connector and the battery cell, the power supply control circuit includes a positive power transmission line and a negative power transmission line between the connector and the battery cell. The power supply control circuit includes a protection integrated sub-circuit and a switching sub-circuit. The acquisition terminal of the protection integrated sub-circuit is connected to the positive power transmission line to acquire the cell voltage, and the signal output terminal of the protection integrated sub-circuit is connected to the control terminal of the switch sub-circuit. The switch sub-circuit is disposed on the negative power transmission line, and the switch sub-circuit is used to control the on / off state of the negative power transmission line. The protection integrated sub-circuit includes a controllable boost structure. When the cell voltage meets a preset trigger condition, the protection integrated sub-circuit sends a trigger signal to the controllable boost structure to trigger the controllable boost structure to start boosting, so that the switching sub-circuit is in the conducting state.

2. The power supply control circuit according to claim 1, characterized in that, The connector includes a positive terminal and a negative terminal; the battery cell includes a positive output terminal and a negative output terminal; the switching sub-circuit includes a first field-effect transistor and a second field-effect transistor. In this configuration, the gate of the first field-effect transistor is connected to the signal output terminal of the protection integrated circuit, the source of the first field-effect transistor is connected to the negative terminal of the battery cell output terminal, the drain of the first field-effect transistor is connected to the drain of the second field-effect transistor, the gate of the second field-effect transistor is connected to the signal output terminal of the protection integrated circuit, and the source of the second field-effect transistor is connected to the negative terminal pin.

3. The power supply control circuit according to claim 1, characterized in that, The power supply control circuit also includes a first capacitor and a first resistor. One end of the first capacitor is connected to the positive power transmission line, and the other end of the first capacitor is grounded. One end of the first resistor is connected to the positive power transmission line, and the other end of the first resistor is connected to one end of the first capacitor.

4. The power supply control circuit according to claim 2, characterized in that, The connector is used to connect to an external power source during charging, so that the electrical energy input from the external power source is converted by the power supply control circuit and transmitted to the battery cell. The connector is also used to connect to a load device during discharge, so as to output the electrical energy of the battery cell to the load device via the power supply control circuit.

5. The power supply control circuit according to claim 2, characterized in that, The power supply control circuit also includes a second resistor, a second capacitor, and a third capacitor. Wherein, one end of the second resistor is connected to the voltage output terminal of the protection integrated sub-circuit, and the other end of the second resistor is connected to a preset terminal of the switch sub-circuit, the preset terminal being the end of the switch sub-circuit closest to the connector; One end of the second capacitor is connected to the first source of the first field-effect transistor, and the other end of the second capacitor is connected to one end of the third capacitor, and the other end of the third capacitor is connected to the second source of the second field-effect transistor.

6. The power supply control circuit according to claim 5, characterized in that, The power supply control circuit also includes a fourth capacitor and a fifth capacitor. One end of the fourth capacitor is connected to the positive power transmission line, and the other end of the fourth capacitor is connected to one end of the fifth capacitor. The other end of the fifth capacitor is connected between the preset terminal of the switch sub-circuit and the connector.

7. The power supply control circuit according to claim 1, characterized in that, The power supply control circuit also includes an identification resistor. One end of the identification resistor is connected between the preset terminal of the switch sub-circuit and the connector, and the other end of the identification resistor is connected to the identification terminal of the connector.

8. The power supply control circuit according to claim 1, characterized in that, The power supply control circuit also includes a thermistor. One end of the thermistor is connected between the preset terminal of the switch sub-circuit and the connector, and the other end of the thermistor is connected to the temperature detection terminal of the connector.

9. A BMS protection board, characterized in that, The BMS protection board includes the power supply control circuit as described in any one of claims 1-8.

10. A power supply device, characterized in that, Includes battery cells and the BMS protection board as described in claim 9.

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