Battery management system and electronic equipment

Abstract

The utility model provides a battery management system and electronic equipment, the battery management system comprises a drive control module, a first control module and a second control module, the first end of the drive control module is configured to be connected with a battery pack, and the second end of the drive control module is connected with a first connecting end; the second control module is connected with the control end of the first control module and the control end of the driving control module, and under the condition that the first control module is abnormal, the second control module is configured to control the driving control module to be closed for a period of time and then disconnected. And the second control module is configured to control the driving control module to be switched off after being closed for a period of time, so that when the first control module is abnormal, the battery pack can continuously provide necessary energy for the whole vehicle through the first connecting end so as to switch to the safety state, and the technical problem that the safety state cannot be switched under the abnormal condition is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a battery management system and electronic equipment. BACKGROUND

[0002] The battery management system in the prior art is mainly used for intelligently managing and maintaining each battery unit in a battery pack, monitoring the state of the battery, preventing overcharging and overdischarging of the battery, and prolonging the service life of the battery.

[0003] However, in the case where the control core of the battery management system is abnormal (for example, the control core has run away), the whole vehicle cannot be switched to a relatively safe state, which is easy to cause an accident. SUMMARY

[0004] The embodiments of the utility model provide a battery management system and electronic equipment, which can improve the technical problem that the safe state cannot be switched under abnormal conditions.

[0005] In a first aspect, the embodiments of the utility model provide a battery management system, which comprises a drive control module, a first control module and a second control module, the first end of the drive control module is configured to be connected with a battery pack, the second end of the drive control module is connected with a first connection end; the second control module is connected with the control end of the first control module and the drive control module, and in the case where the first control module is abnormal, the second control module is configured to control the drive control module to be disconnected in delay.

[0006] In an embodiment, the battery management system further comprises a charging current limiting module, the input end of the charging current limiting module is connected with the second end of the drive control module, the first output end of the charging current limiting module is connected with the first end of the drive control module, and the second output end of the charging current limiting module is connected with the first control module.

[0007] In an embodiment, the battery management system further comprises a first connector, a communication module, a first diode and a second diode, the first connector is connected with the first control module; the communication module is connected between the first control module and the first connector; the positive electrode of the first diode is connected with the communication module, and the negative electrode of the first diode is connected with the second control module; the positive electrode of the second diode is connected with the first connector, and the negative electrode of the second diode is connected with the negative electrode of the first diode.

[0008] In an embodiment, the battery management system further comprises a timing module and a third diode, the timing module is connected with the first control module; the positive electrode of the third diode is connected with the timing module, and the negative electrode of the third diode is connected with the negative electrode of the second diode.

[0009] In an embodiment, the battery management system further comprises a current collection resistor, one end of the current collection resistor being connected with the battery pack and the second control module, and the other end of the current collection resistor being connected with the second control module.

[0010] In an embodiment, the battery management system further comprises a second connector and a voltage collection and equalization module, the second connector being connected with the battery pack, and the voltage collection and equalization module being connected with the second connector and the second control module.

[0011] In an embodiment, the battery management system further comprises a first resistor and a fourth diode, one end of the first resistor being connected with the second connector, and the positive electrode of the fourth diode being connected with the other end of the first resistor, and the negative electrode of the fourth diode being connected with the second control module.

[0012] In an embodiment, the battery management system further comprises a temperature detection module, an input end of the temperature detection module being connected with the second connector, and an output end of the temperature detection module being connected with the first control module.

[0013] In an embodiment, the first control module is a micro control unit, and the first end of the drive control module is connected with the positive electrode of the battery pack.

[0014] In a second aspect, an embodiment of the utility model provides an electronic equipment, the electronic equipment includes the battery management system.

[0015] The embodiment of the utility model has the advantages of:

[0016] In the embodiment of the utility model, when the first control module is abnormal, the second control module is configured to control the drive control module to be disconnected after a period of time, that is, to be disconnected after being closed for a period of time, so that when the first control module is abnormal, the battery pack can continue to provide necessary energy for the whole vehicle through the first connection end to switch to a safe state, thereby improving the technical problem that the safe state cannot be switched under abnormal conditions. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating creative labor.

[0018] Figure 1 It is a schematic diagram of the device function state provided by the embodiment of the utility model;

[0019] Figure 2 It is a structural diagram of the battery management system provided by the embodiment of the utility model. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0021] In view of the problem that the number of modes of device functional status is small, this application provides a battery management system, please refer to Figure 1 and Figure 2 ,like Figure 1 As shown, the battery management system includes a first control module 10 and a second control module 11. The second control module 11 is connected to the first control module 10 to perform control and signal interaction. The second control module 11 is used to control the device functional states (FSM). Figure 2 As shown, the device functional state includes sleep mode (SLEEP MODE), normal mode (NORMAL MODE) and power down mode (POWER DOWN MODE). When the first condition is met, the device functional state switches from normal mode to power down mode; when the second condition is met, the device functional state switches from power down mode to sleep mode.

[0022] It can be understood that in the embodiments of the present invention, by adding a power-off mode on the basis of the original mode, not only the number of modes of the device functional state is enriched, thereby improving the technical problem of the small number of modes of the device functional state; but also the newly added power-off mode can be switched with the original mode when triggered by corresponding conditions, thereby realizing the organic integration of the various modes of the device functional state, so that it can be applied to more application scenarios.

[0023] It should be noted that the first control module 10 may be a controller such as a microcontroller unit (MCU). The second control module 11 may be an integrated circuit that integrates multiple chips, for example, a power management chip (PMIC), a gate driver, and an analog front end (AFE) chip.

[0024] The power-down mode means that all sources of the device are turned off.

[0025] In one embodiment, the first condition is a watchdog failure. In response to the watchdog failure, the fault information of the first control module 10 is uploaded to the second control module 11 .

[0026] It should be noted that the watchdog failure can be persistent, for example, lasting more than 30 seconds or 1 minute. The watchdog failure can be caused by an abnormality in the first control module 10. In this way, when the first control module 10 is abnormal, more diagnostic information about the first control module 10 can be saved to the second control module 11 for subsequent analysis and location of this diagnostic information, thereby reducing the difficulty of finding the cause of the fault after a battery-related fault occurs.

[0027] It should be noted that the first condition may also be oscillator failure, main oscillator failure, or thermal shutdown, wherein oscillator failure includes main oscillator failure and / or backup oscillator failure. Main oscillator failure refers to a situation where the main oscillator is stuck or damaged and cannot work.

[0028] In one embodiment, the second condition is that the effective duration of the watchdog is greater than or equal to the duration of switching from the power-down mode to the sleep mode. Alternatively, the second condition is that the backup oscillator fails and / or the external crystal oscillator fails.

[0029] It should be noted that the newly added power-off mode can be switched with the original normal mode and sleep mode through the first condition and the second condition, which realizes the organic integration of the various modes of the device functional status, so that it can be applied to more application scenarios.

[0030] like Figure 1 As shown, when the internal power-on reset is invalid, the device functional state can be switched from other modes such as sleep mode, normal mode, standby mode or power-down mode to power-off mode. When the internal power-on reset is valid, the device functional state can be switched from power-off mode to sleep mode. When the backup oscillator fails and / or the external crystal oscillator fails, the device functional state can be switched from standby mode to sleep mode. When ignition wake-up is valid or hard-line wake-up is valid, the device functional state can be switched from sleep mode to normal mode. When ignition wake-up is invalid and a request command to enter standby mode is issued, the device functional state can be switched from normal mode to standby mode.

[0031] In the event that ignition wakeup fails and a sleep mode entry request is issued, or in response to a backup oscillator failure, the device functional state may switch from normal mode to sleep mode. A backup oscillator failure refers to a situation where the backup oscillator is stuck or damaged and cannot operate.

[0032] If the third condition is met, the device functional state switches from standby mode to normal mode. The third condition is the validity of ignition wake-up, hard-wire wake-up, cyclic fault detection request, active diagnostic fault detection request, short-circuit detection request, timed wake-up signal, charge / discharge wake-up signal, battery deep undervoltage detection request, or exceeding the overflow time threshold.

[0033] In view of the problem that it is impossible to switch to a safe state under abnormal conditions, this application provides a battery management system, such as Figure 2 As shown, the battery management system includes a drive control module 12, a first control module 10 and a second control module 11. The first end of the drive control module 12 is configured to be connected to the positive electrode (BAT+) of the battery pack 20, and the second end of the drive control module 12 is connected to the first connection end KL30; the second control module 11 is connected to the control ends of the first control module 10 and the drive control module 12. When the first control module 10 is abnormal, the second control module 11 is configured to control the drive control module 12 to delay disconnection.

[0034] It can be understood that in the embodiment of the present application, by controlling the second control module 11 to close the drive control module 12 for a period of time and then disconnect it when the first control module 10 is abnormal, the battery pack 20 can continue to provide the necessary energy for the entire vehicle through the first connection terminal KL30 to switch to a safe state when an abnormality occurs in the first control module 10, thereby improving the technical problem of being unable to switch to a safe state under abnormal circumstances.

[0035] It should be noted that delayed disconnection refers to closing for a period of time before disconnecting. The second control module 11 can collect information such as battery voltage and temperature, as well as diagnose battery status, and transmit it to the first control module 10. Combined with the battery management system's own status, the second control module 11 can intelligently control the closing and opening of the circuit containing the drive control module 12, thereby managing the charge and discharge of the low-voltage battery.

[0036] In one embodiment, if Figure 2 As shown, the battery management system also includes a charging current limiting module 13, the input end of the charging current limiting module 13 is connected to the second end of the drive control module 12, the first output end of the charging current limiting module 13 is connected to the first end of the drive control module 12, and the second output end of the charging current limiting module 13 is connected to the first control module 10.

[0037] It should be noted that the charging current limiting module 13 is used to monitor and limit the charging current provided to the battery pack 20, and report the charging current data and / or whether over-current limiting charging occurs to the first control module 10 through the IIC communication protocol.

[0038] In one embodiment, ifFigure 2 As shown, the battery management system further comprises a first connector 16 connected with the first control module 10, a communication module 14 connected between the first control module 10 and the first connector 16, a first diode D1 having a positive electrode connected with the communication module 14 and a negative electrode connected with the second control module 11, and a second diode D2 having a positive electrode connected with the first connector 16 and a negative electrode connected with the negative electrode of the first diode D1.

[0039] It should be noted that the communication module 14 can be a CAN module, which can communicate with the first control module 10 through SPI protocol to receive (RX) or send (TX) data. The first control module 10 sends the information of voltage, temperature and diagnosis state of the battery obtained by the second control module 11 to the vehicle controller through the first connector 16, and receives the control command from the vehicle controller. The CAN module can also output a first wake-up signal INH according to the communication condition, which is output to the second control module 11 through the first diode D1. The vehicle controller also provides a reset signal EXT_RST to the first control module 10 through the first connector 16 to reset the first control module 10. The vehicle controller also provides an external wake-up signal EXT_WAKEUP through the first connector 16, which is combined with the first wake-up signal INH into a wake-up signal Wake_Up through the second diode D2, which only needs to occupy one input terminal of the second control module 11 to realize multiple wake-ups, which reduces the number of input terminals of the second control module 11.

[0040] In an embodiment, the battery management system further comprises a timing module 15 connected with the first control module 10 and a third diode D3 having a positive electrode connected with the timing module 15 and a negative electrode connected with the negative electrode of the second diode D2.

[0041] It should be noted that the timing module 15 can also be an RTC module, which has the functions of timing and outputting a second wake-up signal INT, which can be output through the third diode D3 and combined with the first wake-up signal INH and the external wake-up signal EXT_WAKEUP into a wake-up signal Wake_Up, which only needs to occupy one input terminal of the second control module 11 to realize multiple wake-ups, further reducing the number of input terminals of the second control module 11. The timing module 15 can interact with the first control module 10 through IIC protocol.

[0042] In an embodiment, the battery management system further comprises a current collection resistor R1, one end of the current collection resistor R1 is connected with the negative electrode (BAT-) of the battery pack 20 and the second control module 11, and the other end of the current collection resistor R1 is connected with the second control module 11 and the second connection end KL31.

[0043] It should be noted that the current collection resistor R1 can collect the current of the battery in the battery pack 20 and convert it into a corresponding voltage output to the second control module 11, and the second control module 11 can convert the voltage into a corresponding current to obtain the current of the battery.

[0044] In an embodiment, the battery management system further comprises a second connector 19 and a voltage collection and balancing module 18, the second connector 19 is connected with the battery pack 20, and the voltage collection and balancing module 18 is connected with the second connector 19 and the second control module 11.

[0045] It should be noted that the voltage collection and balancing module 18 can collect the battery voltage in the battery pack 20 through the second connector 19 and balance the battery voltage.

[0046] In an embodiment, the battery management system further comprises a first resistor R2 and a fourth diode D4, one end of the first resistor R2 is connected with the second connector 19, the positive electrode of the fourth diode D4 is connected with the other end of the first resistor R2, and the negative electrode of the fourth diode D4 is connected with the second control module 11.

[0047] It should be noted that the first resistor R2 and the fourth diode D4 can provide a corresponding working voltage (VBAT) for the second control module 11, and the fourth diode D4 can prevent the working voltage from affecting the second connector 19.

[0048] In an embodiment, the battery management system further comprises a temperature detection module 17, an input end of the temperature detection module 17 is connected with the second connector 19, and an output end of the temperature detection module 17 is connected with the first control module 10.

[0049] It should be noted that the temperature detection module 17 can monitor the temperature of the battery pack 20 in real time through the second connector 19, and transmit the temperature to the second control module 11 through the first control module 10.

[0050] In an embodiment, the application provides an electronic device, which comprises the above-mentioned battery management system.

[0051] It can be understood that, in the embodiments of the present application, by adding a power-off mode on the basis of the power-off mode, sleep mode, normal mode and standby mode, not only the number of device function state modes is enriched, thereby improving the technical problem of less number of device function state modes, but also the newly added power-off mode can be switched with the original mode under the triggering of the corresponding condition, realizing the organic integration between the modes of the device function state, thereby being able to be applied to more application scenarios.

[0052] In addition, in the embodiments of the present application, under the abnormal condition of the first control module 10, the second control module 11 controls the drive control module 12 to be closed for a period of time and then disconnected, so that when the first control module 10 is abnormal, the battery pack 20 can continue to provide necessary energy for the whole vehicle through the first connection end KL30 to switch to the safe state, thereby improving the technical problem that the safe state cannot be switched under abnormal conditions.

[0053] It should be noted that the above electronic device can be a new energy vehicle, an electric vehicle or the like.

[0054] The embodiments of the present application are described in detail above, and the principle and implementation mode of the present application are described by applying specific examples; the above embodiment description is only used to help understand the method and core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description should not be understood as a limitation of the present application.

Claims

1. A battery management system, characterized in that: The battery management system includes: a drive control module, wherein a first end of the drive control module is configured to be connected to the battery pack, and a second end of the drive control module is connected to the first connection end; a first control module; The second control module is connected to the control end of the first control module and the drive control module. When the first control module is abnormal, the second control module is configured to control the drive control module to delay disconnection.

2. The battery management system according to claim 1, characterized in that: The battery management system also includes a charging current limiting module, the input end of the charging current limiting module is connected to the second end of the drive control module, the first output end of the charging current limiting module is connected to the first end of the drive control module, and the second output end of the charging current limiting module is connected to the first control module.

3. The battery management system according to claim 2, characterized in that: The battery management system further includes: a first connector connected to the first control module; a communication module connected between the first control module and the first connector; a first diode, wherein an anode of the first diode is connected to the communication module, and a cathode of the first diode is connected to the second control module; A second diode, wherein an anode of the second diode is connected to the first connector, and a cathode of the second diode is connected to the cathode of the first diode.

4. The battery management system according to claim 3, characterized in that: The battery management system further includes: a timing module, the timing module being connected to the first control module; A third diode, wherein the anode of the third diode is connected to the timing module, and the cathode of the third diode is connected to the cathode of the second diode.

5. The battery management system according to any one of claims 1 to 4, characterized in that: The battery management system further includes a current collection resistor, one end of which is connected to the battery pack and the second control module, and the other end of which is connected to the second control module.

6. The battery management system according to claim 5, characterized in that: The battery management system further includes: a second connector connected to the battery pack; A voltage acquisition and balancing module is connected to the second connector and the second control module.

7. The battery management system according to claim 6, characterized in that: The battery management system further includes: a first resistor, one end of the first resistor being connected to the second connector; a fourth diode, wherein an anode of the fourth diode is connected to the other end of the first resistor, and a cathode of the fourth diode is connected to the second control module.

8. The battery management system according to any one of claims 1 to 4, characterized in that: The battery management system further includes a temperature detection module, an input end of the temperature detection module is connected to the second connector, and an output end of the temperature detection module is connected to the first control module.

9. The battery management system according to any one of claims 1 to 4, characterized in that: The first control module is a micro control unit.

10. An electronic device, characterized in that: The electronic device comprises the battery management system according to any one of claims 1 to 9.

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