Battery protection circuit and power supply module

Abstract

The utility model relates to a battery protection circuit and a power supply module, and relates to the field of battery protection. In the application, the battery management system is electrically connected with at least one battery cell so as to obtain fault data of the at least one battery cell; the host power supply control module is matched with the battery management system; the host power control module and / or the battery management system generate a cut-off protection signal in response to the fault data, and the host power control module disconnects a circuit between the charger and the at least one battery cell in response to the cut-off protection signal. The circuit protection design is carried out in the host power supply control module, so that the host power supply control module can respond to the cut-off protection signal to disconnect the circuit between the battery management system and the charger, and the charger stops charging at least one battery cell; and charging protection is carried out on the battery.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery protection, in particular to a battery protection circuit and a power module. BACKGROUND

[0002] With the rapid development of lithium battery technology, lithium batteries have been widely used in many fields due to their high energy density, long cycle life and other significant advantages. However, under this background, the safety of lithium batteries has also been increasingly concerned, especially the safety of charging. CONTENT OF THE INVENTION

[0003] The present application provides a battery protection circuit for protecting a battery, the battery being electrically connected with a power supply through a charger, the battery comprising a battery cell, characterized in that the battery protection circuit comprises:

[0004] a battery management system electrically connected with at least one battery cell for obtaining fault data of the at least one battery cell; and

[0005] a host power control module cooperatively arranged with the battery management system to enable the charger to charge the at least one battery cell through the host power control module and the battery management system; the host power control module and / or the battery management system is arranged to generate a cut-off protection signal in response to the fault data, and the host power control module is arranged to disconnect the circuit between the charger and the at least one battery cell in response to the cut-off protection signal, so as to stop the charger from charging the at least one battery cell.

[0006] In some embodiments, the host power control module and the battery management system are cooperatively arranged to enable the at least one battery cell to supply power to the load through the battery management system and the host power control module.

[0007] In some embodiments, the host power control module comprises a first micro control unit arranged to generate a first control signal in response to the cut-off protection signal, a first switching device for turning on the circuit between the charger and the battery management system to enable the charger to charge the at least one battery cell, and a first switching drive circuit electrically connected with the first micro control unit and connected to the control end of the first switching device, and arranged to drive the first switching device to disconnect the circuit between the charger and the battery management system in response to the first control signal, so as to stop the charger from charging the at least one battery cell.

[0008] In some embodiments, the host power control module further comprises: a second switch device for conducting a circuit between the battery management system and the load to enable the at least one battery cell to supply power to the load, and for disconnecting the circuit between the battery management system and the load to disable the at least one battery cell to supply power to the load; and a second switch driving circuit electrically connected to the first micro control unit and to a control terminal of the second switch device, the second switch driving circuit configured to drive the first switch device to conduct or disconnect the circuit between the battery management system and the load in response to a load control signal from the first micro control unit.

[0009] In some embodiments, the battery management system comprises: a second micro control unit configured to generate a cut-off protection signal in response to the fault data, and to generate a second control signal in response to the cut-off protection signal.

[0010] a third switch device for conducting a circuit between the host power control module and the at least one battery cell to enable the charger to charge the at least one battery cell in cooperation with the host power control module; and a third switch driving circuit electrically connected to the second micro control unit and to a control terminal of the third switch device, and configured to drive the third switch device to disconnect the circuit between the host power control module and the at least one battery cell in response to the second control signal to disable the charger to charge the at least one battery cell.

[0011] In some embodiments, the battery management system further comprises: a fourth switch device for conducting a circuit between the at least one battery cell and the host power control module to enable the at least one battery cell to supply power to the load in cooperation with the host power control module, and for disconnecting the circuit between the at least one battery cell and the host power control module to disable the at least one battery cell to supply power to the load; and a fourth switch driving circuit electrically connected to the second micro control unit and to a control terminal of the fourth switch device, the fourth switch driving circuit configured to drive the fourth switch device to conduct or disconnect the circuit between the at least one battery cell and the host power control module in response to a load control signal from the second micro control unit.

[0012] In some embodiments, the battery management system further comprises: an analog front end circuit electrically connected to the at least one battery cell for obtaining fault data of the at least one battery cell, and electrically connected to the second micro control unit, the second micro control unit configured to generate a cut-off protection signal in response to the fault data.

[0013] In some embodiments, the host power control module comprises a first micro control unit, the second micro control unit is in serial communication connection with the first micro control unit, and the first micro control unit is configured to receive the cut-off protection signal output by the second micro control unit.

[0014] In some embodiments, the battery management system is configured to generate the cut-off protection signal in response to a result that a difference between a voltage of any of the battery cells and a preset voltage threshold is greater than or equal to 0.15V.

[0015] In some embodiments, the host power control module has a first charge / discharge interface, the battery management system has a second charge / discharge interface, the first charge / discharge interface is in electrical connection with the second charge / discharge interface, the charger is configured to charge the at least one battery cell through the first charge / discharge interface and the second charge / discharge interface, and the at least one battery cell is configured to supply power to the load through the first charge / discharge interface and the second charge / discharge interface.

[0016] The application provides a power module for a robot or a base station, comprising at least one battery cell and the battery protection circuit described above, wherein the at least one battery cell is in electrical connection with the battery management system.

[0017] The application has the following beneficial effects: the application designs a circuit protection in the host power control module, so that the host power control module can disconnect the circuit between the battery management system and the charger in response to the cut-off protection signal, so as to stop the charger from charging the at least one battery cell, and further to protect the battery from being charged. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0019] Figure 1 The figure is a framework schematic diagram of the battery protection circuit in some embodiments of the application;

[0020] Figure 2 The figure is a framework schematic diagram of the host power control module in some embodiments of the application; Figure 1 The figure is a framework schematic diagram of the host power control module in some embodiments of the application;

[0021] Figure 3 The figure is a framework schematic diagram of the host power control module in some embodiments of the application; Figure 2 The figure is a framework schematic diagram of the host power control module in some embodiments of the application;

[0022] Figure 4 FIG. 1 shows a schematic diagram of a framework of a battery management system in some embodiments; Figure 1

[0023] Figure 5 FIG. 1 shows a schematic diagram of a framework of a battery management system in some embodiments; Figure 4

[0024] Figure 6 FIG. 1 shows a schematic diagram of a framework of a battery management system in some embodiments; Figure 4

[0025] Figure 7 FIG. 1 shows a schematic diagram of a framework of a battery protection circuit in some embodiments; Figure 1

[0026] Figure 8 FIG. 1 shows a schematic diagram of a framework of a power module in some embodiments of the present application;

[0027] Figure 9 FIG. 1 shows a schematic diagram of a framework of a battery pack in some embodiments of the present application. DETAILED DESCRIPTION

[0028] The present application will be further described by examples with reference to the drawings. It is particularly pointed out that the following examples are merely illustrative of the present application and are not meant to limit the scope of the application. Similarly, the following examples are merely some embodiments of the present application and all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of the present application.

[0029] Reference to“an embodiment” or“the embodiment” in this application means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase“in one embodiment” or“in an embodiment” in various places in the specification are generally not intended to be construed as necessarily creating a separate or independent embodiment of the application.

[0030] In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0031] The present application describes a battery protection circuit, which can ensure the safe use of the battery, especially the safe charging, and thus can ensure the personal and property safety of consumers, users or operators. The battery protection circuit can be used in household appliances involving batteries such as floor cleaning machines, vacuum cleaners or lawn mowers, and can also be used in power tools involving batteries, and of course can also be used in other devices and equipment involving batteries, which will not be described here. ​​​​

[0032] In some embodiments, the battery can be a lithium battery or other rechargeable / dischargeable battery, without being limited thereto.

[0033] In some embodiments, the battery can be a vehicle-mounted power battery.

[0034] Please refer to Figure 1 , Figure 1 is a schematic diagram of a framework of a battery protection circuit in some embodiments of the present application. The battery protection circuit 100 can include a host power control module 10 and a battery management system (BMS) 20. The host power control module 10 and the battery management system 20 can be electrically connected. The host power control module 10 is a kind of key electronic components, mainly used for managing and controlling the input and output of power supply, and can ensure that the device and system can run stably, so as to be affected by the problems such as insufficient power load or overload. The host power control module 10 can have the main functions of ensuring the safety of the device, optimizing the use of energy, improving the reliability of the device, reducing the maintenance cost, enhancing the flexibility of the device, etc. The battery management system 20 is an important link connecting the battery cell 40 and the load 101, and can also ensure the safe use of the battery cell 40. The battery management system 20 can monitor the use state of the battery cell 40, alleviate the inconsistency of the battery cell 40 through necessary measures, and provide protection for the safe use of the device. The battery management system 20 can monitor the physical parameters of the battery cell 40 in real time, collect the key parameters such as voltage, current and temperature of the battery cell 40; can also estimate the state of the battery cell 40, such as accurately estimating the remaining capacity (SOC) of the battery cell 40, preventing overcharging or overdischarging of the battery cell 40; can also evaluate the health state (SOH) of the battery cell 40 in real time, etc., to reasonably arrange the use and charging plan. In addition, the battery management system 20 can also control the charging and discharging and pre-charging to manage the charging and discharging process of the battery cell 40, ensure that the battery cell 40 works in a safe voltage and current range, and avoid damage to the battery cell 40 caused by overcharging and overdischarging. In some scenarios, during the charging process, the charging strategy is reasonably adjusted according to the state of the battery cell 40, such as controlling the charging speed; during discharging, the stable output power of the battery cell 40 can also be ensured to meet the needs of the device.

[0035] In some embodiments, the battery cell 40 can be the battery cell of the battery in the above embodiments. That is, the battery can include the battery cell 40.

[0036] In some embodiments, the battery protection circuit 100 can be at least part of the battery.

[0037] In some embodiments, the host power control module 10 and the battery management system 20 can be integrated together.

[0038] In some embodiments, the host power control module 10 can be configured to cooperate with the battery management system 20 to enable the charger 30 to charge the at least one battery cell 40 via the host power control module 10 and the battery management system 20.

[0039] It is appreciated that the charger 30 is electrically connected to a power source, and the battery, e.g., the battery cell 40, can be electrically connected to the power source via the charger 30.

[0040] In some embodiments, the host power control module 10 can be configured to cooperate with the battery management system 20 to enable the at least one battery cell 40 to power the load 101 via the host power control module 10 and the battery management system 20.

[0041] It is appreciated that the host power control module 10 and the battery management system 20 can also be configured to cooperate with each other according to the techniques well known in the art and the techniques prior to the present application to enable the safe use of the battery cell 40, which will not be described herein. In addition, the host power control module 10 and the battery management system 20, the load 101, the charger 30, and the battery cell 40 can also be configured to cooperate with each other according to the techniques well known in the art and the techniques prior to the present application, which will not be described herein.

[0042] In further embodiments, the host power control module 10 can be electrically connected to the charger 30 and / or the load 101, and the battery management system 20 can be electrically connected to the at least one battery cell 40. In some scenarios, the host power control module 10 can be connected in series between the battery management system 20 and the charger 30. In some scenarios, the host power control module 10 can be connected in series between the battery management system 20 and the load 101.

[0043] In some embodiments, the host power control module 10 and the charger 30 can be integrated together.

[0044] In some embodiments, the charger 30 can charge the at least one battery cell 40 via the host power control module 10 and the battery management system 20. In some embodiments, the charger 30 can charge the at least one battery cell 40 via the host power control module 10, the connection line 102, the battery management system 20, and the connection line 104. The connection line 102 electrically connects the host power control module 10 and the battery management system 20, and the connection line 104 electrically connects the battery management system 20 and the at least one battery cell 40.

[0045] In some embodiments, the at least one battery cell 40 can power the load 101 via the battery management system 20 and the host power control module 10. In some embodiments, the at least one battery cell 40 can power the load 101 via the connection line 104, the battery management system 20, the connection line 103, and the host power control module 10.

[0046] In some embodiments, the battery management system 20 can be configured to acquire the fault data of the at least one battery cell 40, such as the voltage, the current, the temperature, and the like, and can generate the cutoff protection signal in response to the fault data. In some embodiments, the battery management system 20 can be configured to acquire the fault data of the at least one battery cell 40, such as the voltage, the current, the temperature, and the like, and the host power control module 10 can generate the cutoff protection signal in response to the fault data. In some embodiments, the battery management system 20 can be configured to acquire the fault data of the at least one battery cell 40, such as the voltage, the current, the temperature, and the like, and the host power control module 10 and the battery management system 20 can generate the cutoff protection signal in response to the fault data.

[0047] In some embodiments, the host power control module 10 can disconnect the circuit between the battery management system 20 and the charger 30 in response to the cutoff protection signal, so as to stop the charger 30 from charging the at least one battery cell 40, thereby protecting the battery cell 40 from being charged.

[0048] In some scenarios, the charging current of the battery cell 40 is much smaller than the discharging current based on the life and safety considerations of the battery cell 40. In order to achieve the function of disconnecting the circuit between the battery management system 20 and the charger 30, the device selection range of the host power control module 10 can be larger than that of the battery management system 20, and the function of disconnecting the circuit between the battery management system 20 and the charger 30 can be assigned to the host power control module 10 instead of the battery management system 20, so as to reduce the design difficulty and cost of the battery management system 20, and even reduce the risk of heating of the battery management system 20. In some scenarios, the battery management system 20 can also have the function of disconnecting the circuit between the battery management system 20 and the charger 30, thereby cooperating with the host power control module 10 to protect the battery cell 40 twice and reduce the risk of safety accidents of the battery cell 40.

[0049] In some embodiments, the host power control module 10 and the battery management system 20 can be electrically connected, e.g., coupled, for signal transmission. In some embodiments, the host power control module 10 and the battery management system 20 can be coupled for signal transmission through the connection line 105. In some embodiments, the host power control module 10 and the battery management system 20 can be connected through serial communication, e.g., IIC (Inter-Integrated Circuit), UART (Universal Asynchronous Receiver / Transmitter), RS232 (a standard interface for asynchronous transmission), RS485 (also known as TIA-485-A, ANSI / TIA / EIA-485 or TIA / EIA-485), etc. In some embodiments, the host power control module 10 and the battery management system 20 can be connected through serial communication, e.g., IIC, UART, RS232, RS485, etc., with the cooperation of the connection line 105.

[0050] In some embodiments, the battery management system 20 can be electrically connected, e.g., coupled, with at least one battery cell 40 for data, e.g., fault data, transmission. In some embodiments, the host power control module 10 and the battery management system 20 can be coupled for data, e.g., fault data, transmission through the connection line 106.

[0051] Please refer to Figure 2 , Figure 2 for Figure 1 the frame diagram of the host power control module 10 in some embodiments. The host power control module 10 can include a first switching device 11, a first switching drive circuit 12, and a first microcontroller unit (MCU) 13.

[0052] The first switching device 11 can be used to turn on or turn off the circuit between the charger 30 and the battery management system 20. The switching device, such as the first switching device 11, has the function of turning on or turning off under the trigger of an electrical signal, and is used to act as an electronic switch, and can be an Insulated Gate Bipolar Transistor (IGBT), and can also be a Bipolar Junction Transistor (BJT), a Field Effect Transistor (FET), a Thyristor, etc. The Insulated Gate Bipolar Transistor is a composite full-control voltage-driven power semiconductor device composed of a bipolar transistor and an insulated gate field effect transistor, which has the advantages of high input impedance of the insulated gate field effect transistor and low on-voltage drop of the bipolar transistor. The field effect transistor can be a Metal-Oxide Semiconductor FET (MOS-FET). It can be understood that the switching device can also be other devices or apparatuses, components that can turn on or turn off under the trigger of an electrical signal.

[0053] In some scenarios, the first switching device 11 can be directly connected in series between the charger 30 and the battery management system 20 to turn on or turn off the circuit between the charger 30 and the battery management system 20, wherein the current charged into the at least one battery cell 40 can pass through the first switching device 11. In some embodiments, the first switching device 11 can be coupled between the charger 30 and the battery management system 20 to indirectly control the turning on or turning off of the circuit between the charger 30 and the battery management system 20, wherein the current charged into the at least one battery cell 40 can not pass through the first switching device 11.

[0054] In some embodiments, the first switching device 11 can be used to turn on the circuit between the charger 30 and the battery management system 20 to charge the at least one battery cell 40 by the charger 30. In further embodiments, the current charged into the at least one battery cell 40 can pass through the charger 30, the connecting line 102, the battery management system 20 and the connecting line 104 in turn. Of course, the current charged into the at least one battery cell 40 can pass through or not pass through the host power control module 10 according to the specific structure of the host power control module 10. Even in some embodiments, the current charged into the at least one battery cell 40 can pass through or not pass through the first switching device 11.

[0055] The first micro control unit 13 is configured to generate the first control signal in response to the cut-off protection signal. The cut-off protection signal can be transmitted by the battery management system 20 to the host power control module 10, for example, the first micro control unit 13, and the transmission of the cut-off protection signal between the host power control module 10 and the battery management system 20 can be achieved when the host power control module 10 is electrically connected with the battery management system 20. In some scenarios, the battery management system 20 can transmit the cut-off protection signal to the host power control module 10, for example, the first micro control unit 13, when the battery management system 20 acquires the fault data of the at least one battery cell 40 and generates the cut-off protection signal in response to the fault data.

[0056] In some embodiments, the first micro control unit 13 can receive the fault data, for example, the voltage, the current, the temperature and other key parameters in the above-mentioned embodiments, transmitted by the battery management system 20 when the host power control module 10 is electrically connected with the battery management system 20, and can generate the cut-off protection signal in response to the fault data.

[0057] In some embodiments, the first micro control unit 13 can receive the cut-off protection signal transmitted by the battery management system 20 when the host power control module 10 is electrically connected with the battery management system 20.

[0058] In some embodiments, the first micro control unit 13 and the battery management system 20 can be electrically connected, for example, coupled, to achieve the transmission of the signal, for example, the cut-off protection signal. In some embodiments, the first micro control unit 13 and the battery management system 20 can also be connected through the above-mentioned coupling of the host power control module 10 and the battery management system 20 or the above-mentioned signal transmission between the host power control module 10 and the battery management system 20 or other signal transmission modes, which will not be described herein.

[0059] The first switch driving circuit 12 is electrically connected with the first micro control unit 13 and is electrically connected to the control end of the first switch device 11. The first switch driving circuit 12 can be used to transmit the first control signal generated by the first micro control unit 13 to the control end of the first switch device 11, so that the first switch device 11 acts under the first control signal to turn on or off the circuit between the charger 30 and the battery management system 20. In turn, the first switch driving circuit 12 can be a PWM (pulse width modulation) controller, a MOS-FET controller or other circuits and / or chips that can generate a control signal for the first switch device 11. The specific configuration can be achieved according to the technical solutions well known in the art, which will not be described herein.

[0060] In some embodiments, the first switch driving circuit 12 can drive the first switch device 11 to turn off the circuit between the charger 30 and the battery management system 20 in response to the first control signal, so that the charger 30 stops charging the at least one battery cell 40.

[0061] Referring to Figure 3 , Figure 3 For Figure 2 a frame diagram of the host power control module 10 in some embodiments. The host power control module 10 can further include a second switching device 14 and a second switching driving circuit 15.

[0062] The second switching device 14 can be used to turn on or turn off the circuit between the battery management system 20 and the load 101. The second switching device 14 can refer to the description of the switching device in the above embodiments, and will not be repeated here.

[0063] In some scenarios, the second switching device 14 can be directly connected in series between the battery management system 20 and the load 101 to turn on or turn off the circuit between the battery management system 20 and the load 101. The current discharged by the at least one battery cell 40 can pass through the second switching device 14 to supply power to the load 101. In some embodiments, the second switching device 14 can be coupled between the battery management system 20 and the load 101 to indirectly control the turning on or turning off of the circuit between the battery management system 20 and the load 101. The current discharged by the at least one battery cell 40 can not pass through the second switching device 14 to supply power to the load 101.

[0064] In some embodiments, the second switching device 14 can be used to turn on the circuit between the battery management system 20 and the load 101 to enable the at least one battery cell 40 to supply power to the load 101. In further embodiments, the current discharged by the at least one battery cell 40 can pass through the connection line 104, the battery management system 20 and the connection line 103 in sequence. Of course, the current discharged by the at least one battery cell 40 can pass through or not pass through the host power control module 10 according to the specific structure of the host power control module 10. Even in some embodiments, the current discharged by the at least one battery cell 40 can pass through or not pass through the second switching device 14.

[0065] In some scenarios, the second switching device 14 can protect the battery cell 40 and / or the load 101 to reduce the risk of safety accidents of the battery cell 40 and / or the load 101.

[0066] The first micro control unit 13 is configured to generate the control signal in response to the load control signal. The load control signal can be formed based on the related data of the load 101, the battery management system 20 and / or the battery cell 40, or can be formed based on the demand of the user or operator for the load 101. The specific technical solution can be set according to the technology well known in the art, and will not be repeated here.

[0067] The second switch driving circuit 15 is electrically connected to the first microcontroller unit 13 and to the control terminal of the second switch device 14. The second switch driving circuit 15 can be configured to transmit a control signal generated by the first microcontroller unit 13 based on the load control signal to the control terminal of the second switch device 14, so that the second switch device 14 is actuated under the control signal to turn on or off the circuit between the battery management system 20 and the load 101. The second switch driving circuit 15 can refer to the description of the first switch driving circuit 12 in the above embodiments, and will not be repeated here.

[0068] In some embodiments, the second switch driving circuit 15 can drive the second switch device 14 to turn off the circuit between the battery management system 20 and the load 101 in response to the control signal, so that the charger 30 stops supplying power to the load 101.

[0069] Please refer to Figure 4 , Figure 4 for Figure 1 the frame diagram of the battery management system 20 in some embodiments. The battery management system 20 can include a third switch device 21, a third switch driving circuit 22, and a second microcontroller unit (MCU) 23.

[0070] The third switch device 21 can be configured to turn on or off the circuit between the host power control module 10 and the at least one battery cell 40. When the circuit between the host power control module 10 and the at least one battery cell 40 is turned on, the charger 30 can cooperate with the host power control module 10 to charge the at least one battery cell 40. The third switch device 21 can refer to the description of the switch device in the above embodiments, and will not be repeated here.

[0071] In some scenarios, the third switch device 21 can be directly connected in series between the host power control module 10 and the at least one battery cell 40 to turn on or off the circuit between the host power control module 10 and the at least one battery cell 40, and the current charged into the at least one battery cell 40 can pass through the third switch device 21. In some embodiments, the third switch device 21 can be coupled between the host power control module 10 and the at least one battery cell 40 to indirectly control the turning on or off of the circuit between the host power control module 10 and the at least one battery cell 40, and the current charged into the at least one battery cell 40 can not pass through the third switch device 21.

[0072] In some embodiments, the third switching device 21 can be used to turn on the circuit between the host power control module 10 and the at least one battery cell 40, so that the charger 30 charges the at least one battery cell 40. In further embodiments, the current charged into the at least one battery cell 40 can pass through the charger 30, the connecting wire 102, the battery management system 20 and the connecting wire 104 in sequence. Of course, the current charged into the at least one battery cell 40 can pass through or not pass through the battery management system 20 according to the specific structure of the battery management system 20. Even in some embodiments, the current charged into the at least one battery cell 40 can pass through or not pass through the third switching device 21.

[0073] In some scenarios, the third switching device 21 can cooperate with the host power control module 10 to provide secondary protection for the battery cell 40, thereby reducing the risk of safety accidents of the battery cell 40.

[0074] The second micro control unit 23 can process the fault data about the at least one battery cell 40 received by the battery management system 20, and further generate a cut-off protection signal corresponding to the fault data.

[0075] In some embodiments, the second micro control unit 23 can transmit the cut-off protection signal to the host power control module 10, for example, the first micro control unit 13, when the host power control module 10 and the battery management system 20 are electrically connected.

[0076] In some embodiments, the second micro control unit 23 can be electrically connected, for example, coupled, with the host power control module 10, for example, the first micro control unit 13, to realize signal transmission, for example, cut-off protection signal transmission. In some embodiments, the second micro control unit 23 can be coupled with the host power control module 10, for example, the first micro control unit 13, through the connecting wire 105 to realize signal transmission.

[0077] In some embodiments, the cut-off protection signal can be transmitted by the second micro control unit 23 to the host power control module 10, for example, the first micro control unit 13, and the transmission of the cut-off protection signal between the host power control module 10 and the battery management system 20 can be realized when the host power control module 10 and the battery management system 20 are electrically connected. In some scenarios, when the second micro control unit 23 obtains the fault data of the at least one battery cell 40 and generates the cut-off protection signal in response to the fault data, the second micro control unit 23 can transmit the cut-off protection signal to the host power control module 10, for example, the first micro control unit 13.

[0078] In some embodiments, the second micro control unit 23 and the host power control module 10, for example, the first micro control unit 13, can be further connected through the above-mentioned manner that the host power control module 10 is coupled with the battery management system 20 or the above-mentioned manner that the host power control module 10 and the battery management system 20 transmit signals or other manners of signal transmission, which will not be repeated here.

[0079] In some embodiments, the second micro control unit 23 can transmit the fault data, for example, the above-mentioned key parameters such as voltage, current, temperature, etc., to the host power control module 10, for example, the first micro control unit 13, when the host power control module 10 and the battery management system 20 are electrically connected.

[0080] In some embodiments, the cut-off protection signal can be transmitted by the host power control module 10, for example, the first micro control unit 13, to the battery management system 20, for example, the second micro control unit 23, and the transmission of the cut-off protection signal between the host power control module 10 and the battery management system 20 can be achieved when the host power control module 10 and the battery management system 20 are electrically connected.

[0081] It can be understood that when the host power control module 10 and the battery management system 20 are electrically connected, only the fault data can be transmitted, and the cut-off protection signal can not be transmitted.

[0082] In some embodiments, the second micro control unit 23 can further generate a second control signal in response to the cut-off protection signal.

[0083] The third switch driving circuit 22 is electrically connected to the second micro control unit 23 and to the control end of the third switch device 21. The third switch driving circuit 22 can be used to transmit the second control signal generated by the second micro control unit 23 to the control end of the third switch device 21, so that the third switch device 21 acts under the second control signal to turn on or off the circuit between the host power control module 10 and the battery management system 20. For details of the third switch driving circuit 22, please refer to the above-mentioned description of the first switch driving circuit 12 in the embodiments, which will not be repeated here.

[0084] In some embodiments, the third switch driving circuit 22 can drive the third switch device 21 to turn off the circuit between the host power control module 10 and the battery management system 20 in response to the second control signal, so that the charger 30 stops charging the at least one battery cell 40.

[0085] In some embodiments, the host power control module 10 and / or the battery management system 20 are used to turn on or off the circuit between the host power control module 10 and the battery management system 20, so that the charger 30 charges or stops charging the at least one battery cell 40.

[0086] In some embodiments, the first switching device 11 and / or the third switching device 21 are used to turn on or off the circuit between the host power control module 10 and the battery management system 20, so that the charger 30 charges or stops charging at least one battery cell 40.

[0087] Please see Figure 5 , Figure 5 for Figure 4 The illustrated embodiment shows a schematic diagram of the battery management system 20 in some embodiments. The battery management system 20 may also include a fourth switch drive circuit 25 and a fourth switch device 26.

[0088] The fourth switching device 26 can be used to connect or disconnect the circuit between the main power control module 10 and the battery management system 20. When the circuit between the main power control module 10 and the battery management system 20 is connected, at least one battery cell 40 cooperates with the main power control module 10 to supply power to the load 101. When the circuit between the main power control module 10 and the battery management system 20 is disconnected, at least one battery cell 40 cooperates with the main power control module 10 to stop supplying power to the load 101. For details on the fourth switching device 26, please refer to the description of switching devices in the above embodiments, which will not be repeated here.

[0089] In some scenarios, the fourth switching device 26 can be directly connected in series between the main power control module 10 and the battery management system 20 to enable or disable the circuit between them. In this case, the current discharged from at least one battery cell 40 can be used to power the load 101 through the fourth switching device 26. In some embodiments, the fourth switching device 26 can be coupled between the battery management system 20 and the load 101 to indirectly control the connection or disconnection of the circuit between them. In this case, the current discharged from at least one battery cell 40 can power the load 101 without passing through the fourth switching device 26.

[0090] In some embodiments, the fourth switching device 26 can be used to connect the circuit between the host power control module 10 and the battery management system 20, so that at least one battery cell 40 supplies power to the load 101. In further embodiments, the current discharged by at least one battery cell 40 can pass through the connecting line 104, the battery management system 20, and the connecting line 103 in sequence. Of course, depending on the specific structure of the battery management system 20, the current discharged by at least one battery cell 40 may or may not pass through the battery management system 20. Even in some embodiments, the current discharged by at least one battery cell 40 may or may not pass through the fourth switching device 26.

[0091] In some embodiments, the second micro-control unit 23 is configured to generate the control signal in response to the load control signal. The load control signal can be generated based on data related to the load 101, the battery management system 20, and / or the battery cell 40, or based on a demand of the load 101 by a user or an operator, and can be generated according to techniques well known in the art, which will not be described herein.

[0092] In some embodiments, the control signal generated based on the load control signal can be transmitted between the host power control module 10, e.g., the first micro-control unit 13, and the battery management system 20, e.g., the second micro-control unit 23.

[0093] The fourth switch driving circuit 25 is electrically connected to the second micro-control unit 23 and to the control terminal of the fourth switch device 26. The fourth switch driving circuit 25 can be configured to transmit the control signal generated by the second micro-control unit 23 based on the load control signal to the control terminal of the fourth switch device 26, so that the fourth switch device 26 is actuated under the control signal to turn on or off the circuit between the host power control module 10 and the battery management system 20. The fourth switch driving circuit 25 can refer to the description of the first switch driving circuit 12 in the above embodiments, which will not be described herein.

[0094] In some embodiments, the fourth switch driving circuit 25 can drive the fourth switch device 26 to turn off the circuit between the host power control module 10 and the battery management system 20 in response to the control signal, so that the charger 30 stops supplying power to the load 101.

[0095] In some embodiments, the host power control module 10 and / or the battery management system 20 are configured to turn on or off the circuit between the battery management system 20 and the load 101, so that the charger 30 supplies power to the load 101 or stops supplying power to the load 101.

[0096] In some embodiments, the second switch device 14 and / or the fourth switch device 26 are configured to turn on or off the circuit between the battery management system 20 and the load 101, so that the charger 30 supplies power to the load 101 or stops supplying power to the load 101.

[0097] In some scenarios, the fourth switch device 26 can cooperate with the host power control module 10 to provide secondary protection for the battery cell 40 and / or the load 101, so as to reduce the risk of safety accidents of the battery cell 40 and / or the load 101.

[0098] Please refer to Figure 6 , Figure 6 To Figure 4The battery management system 20 in the illustrated embodiment is a schematic diagram of a framework in some embodiments. The battery management system 20 can further include an analog front end circuit (AFE) 24. The analog front end circuit 24 can be electrically connected with the at least one battery cell 40 for obtaining fault data of the at least one battery cell 40. The analog front end circuit 24 can be electrically connected with the second micro control unit 23, which can receive the fault data and generate the shutdown protection signal in response to the fault data. As to the analog front end circuit 24, it can be configured according to the techniques well known in the art, and of course, the analog front end circuit 24 can be replaced by other techniques well known in the art for obtaining fault data, which will not be described herein.

[0099] In some embodiments, the host power control module 10, e.g., the first micro control unit 13, can be serially connected in communication with the battery management system 20, e.g., the second micro control unit 23, and the shutdown protection signal and / or the fault data can be transmitted between the host power control module 10, e.g., the first micro control unit 13, and the battery management system 20, e.g., the second micro control unit 23.

[0100] In some embodiments, the fault data can be voltage data of the battery cell 40. In some embodiments, the battery management system 20, e.g., the second micro control unit 23, can generate the shutdown protection signal in response to a result that a difference between a voltage of any battery cell 40 and a preset voltage threshold is greater than or equal to a first threshold. In some embodiments, the first threshold can be 0-5V, and of course, the first threshold can be adjusted according to the techniques well known in the art, which will not be described herein. In some embodiments, the first threshold can be 0.15V. In some embodiments, the first threshold can be 0.35V. In some embodiments, the first threshold can be 0.65V. In some embodiments, the first threshold can be 0.85V. In some embodiments, the first threshold can be 1.5V. In some embodiments, the first threshold can be 2.5V. In some embodiments, the first threshold can be 3.5V.

[0101] Please refer to Figure 7 , Figure 7 for Figure 1 a schematic diagram of a framework of the battery protection circuit 100 in some embodiments. The host power control module 10 can have a first charge / discharge interface 16, and the battery management system 20 can have a second charge / discharge interface 27, so that the first charge / discharge interface 16 is electrically connected with the second charge / discharge interface 27. For example, the first charge / discharge interface 16 is electrically connected with the second charge / discharge interface 27 through a connection line 102. For example, the first charge / discharge interface 16 is electrically connected with the second charge / discharge interface 27 through a connection line 103

[0102] The first charge / discharge interface 16 and the second charge / discharge interface 27 can be configured to allow the battery cell 40 to be charged and discharged from the same end.

[0103] Next, a power module is described. The power module can be used to ensure safe use of a battery, especially to ensure safe charging, and thus to ensure the safety of a person and property of a consumer, a user or an operator. The power module can be used in a household appliance involving a battery, such as a floor cleaning machine, a vacuum cleaner or a lawn mower, and can also be used in a power tool involving a battery, and of course can also be used in other devices and apparatuses involving a battery, which will not be described herein.

[0104] In some embodiments, the power module can also be used in other devices and apparatuses requiring battery power supply. In some embodiments, the power module can be used in a robot. In some embodiments, the power module can be used in a base station.

[0105] Referring to Figure 8 , Figure 8 is a schematic diagram of a frame of the power module in some embodiments of the present application. The power module 200 can include the battery protection circuit 100, the charger 30 and at least one battery cell 40 in the above-described embodiments. The battery protection circuit 100, the charger 30 and the battery cell 40 will not be described herein for the sake of brevity.

[0106] In some embodiments, the power module 200 can be the battery in the above-described embodiments. In some embodiments, the power module 200 can include the battery in the above-described embodiments. In some embodiments, the power module 200 can be the battery in the above-described embodiments.

[0107] Next, a battery pack is described. The battery pack can be used in the battery protection circuit 100 in the above-described embodiments, and can also be used in the power module 200 in the above-described embodiments.

[0108] Referring to Figure 9 , Figure 9 is a schematic diagram of a frame of the battery pack in some embodiments of the present application. The battery pack 300 can include the battery management system 20 and at least one battery cell 40 in the above-described embodiments. The battery management system 20 and the battery cell 40 will not be described herein for the sake of brevity.

[0109] In some embodiments, the battery pack 300 can be the battery in the above-described embodiments. In some embodiments, the battery pack 300 is at least part of the battery in the above-described embodiments.

[0110] In several embodiments provided in the present application, it should be understood that the disclosed methods and devices can be implemented in other manners. For example, the embodiments of the device described above are merely schematic, and the division of the modules or units is merely logical function division, and there can be another division manner in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In this way, the actual implementation can be divided into other forms.

[0111] The units described as separated components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purposes of the embodiments.

[0112] In addition, each functional unit in the embodiments of the present application can be integrated in a processing unit, or each unit can exist physically as a separate unit, or two or more units can be integrated in one unit. The integrated unit can be implemented in the form of hardware, or in the form of a software functional unit.

[0113] The above description is merely some embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structure or equivalent flow transformation based on the content of the present application specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A battery protection circuit for protecting a battery, the battery being electrically connected to a power source by a charger, the battery comprising a cell, characterized in that, The battery protection circuit comprises: a battery management system electrically connected with the at least one battery cell for obtaining fault data of the at least one battery cell; and a host power control module cooperatively arranged with the battery management system to enable the charger to charge the at least one battery cell through the host power control module and the battery management system; the host power control module and / or the battery management system is arranged to generate a cut-off protection signal in response to the fault data, and the host power control module is arranged to disconnect the circuit between the charger and the at least one battery cell in response to the cut-off protection signal, so that the charger stops charging the at least one battery cell.

2. The battery protection circuit of claim 1, wherein, The host power control module comprises: a first micro control unit arranged to generate a first control signal in response to the cut-off protection signal; a first switch device for conducting the circuit between the charger and the battery management system to enable the charger to charge the at least one battery cell; and a first switch driving circuit electrically connected with the first micro control unit and connected to the control end of the first switch device, and arranged to drive the first switch device to disconnect the circuit between the charger and the battery management system in response to the first control signal, so that the charger stops charging the at least one battery cell.

3. The battery protection circuit of claim 2, wherein, The host power control module further comprises: a second switch device for conducting the circuit between the battery management system and a load to enable the at least one battery cell to supply power to the load, and for disconnecting the circuit between the battery management system and the load to enable the at least one battery cell to stop supplying power to the load; and a second switch driving circuit electrically connected with the first micro control unit and connected to the control end of the second switch device, and arranged to drive the first switch device to conduct or disconnect the circuit between the battery management system and the load in response to a load control signal of the first micro control unit.

4. The battery protection circuit according to any one of claims 1 to 3, characterized in that, The battery management system comprises: a second micro control unit arranged to generate a cut-off protection signal in response to the fault data, and to generate a second control signal in response to the cut-off protection signal; a third switch device for conducting the circuit between the host power control module and the at least one battery cell to enable the charger to charge the at least one battery cell in cooperation with the host power control module; and a third switch driving circuit electrically connected with the second micro control unit and connected to the control end of the third switch device, and arranged to drive the third switch device to disconnect the circuit between the host power control module and the at least one battery cell in response to the second control signal, so that the charger stops charging the at least one battery cell.

5. The battery protection circuit of claim 4, wherein, The battery management system further comprises: a fourth switch device for turning on a circuit between the at least one battery cell and the host power control module to cooperate with the host power control module to make the at least one battery cell supply power to a load, and for turning off the circuit between the at least one battery cell and the host power control module to make the at least one battery cell stop supplying power to the load; and a fourth switch driving circuit electrically connected to the second micro control unit and to a control terminal of the fourth switch device, the fourth switch driving circuit being configured to drive the fourth switch device to turn on or turn off the circuit between the at least one battery cell and the host power control module in response to a load control signal from the second micro control unit.

6. The battery protection circuit of claim 4, wherein, The battery management system further comprises: an analog front end circuit electrically connected to the at least one battery cell for obtaining fault data of the at least one battery cell, and electrically connected to the second micro control unit, the second micro control unit being configured to generate a cut-off protection signal in response to the fault data.

7. The battery protection circuit of claim 4, wherein, The host power control module comprises a first micro control unit, the second micro control unit being connected in serial port communication with the first micro control unit, the first micro control unit being configured to receive the cut-off protection signal output by the second micro control unit.

8. The battery protection circuit of claim 1, wherein, The battery management system is configured to generate the cut-off protection signal in response to a result that a difference between a voltage of any of the battery cells and a preset voltage threshold is greater than or equal to 0.15V.

9. The battery protection circuit of claim 4, wherein, The host power control module has a first charge / discharge interface, the battery management system has a second charge / discharge interface, the first charge / discharge interface being electrically connected to the second charge / discharge interface, the charger being configured to charge the at least one battery cell through the first charge / discharge interface and the second charge / discharge interface, and the at least one battery cell being configured to supply power to a load through the first charge / discharge interface and the second charge / discharge interface.

10. A power module, characterized by The power module is used in a robot or a base station, and comprises at least one battery cell and the battery protection circuit according to any one of claims 1-9, the at least one battery cell being electrically connected to the battery management system.

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