Battery pack protection device and protection method

Abstract

The embodiment of the invention discloses a battery pack protection device and a protection method, a battery pack and a device to be charged and discharged are respectively connected through a connecting line of the protection device to form a charging and discharging loop, and a measuring module measures working parameters of the battery pack; in the charging and discharging process of the battery pack, the control module controls the switch module in the at least one connecting line to be switched off when determining that the charging and discharging abnormal state occurs according to the working parameters of the battery pack, and even for the battery pack without a communication function, the charging and discharging abnormal condition can be judged in time through the working parameters measured by the measuring module; therefore, when a charging and discharging abnormal state occurs in the charging and discharging process of the battery pack, the charging and discharging loop can be disconnected in time, the battery pack is protected, the service life of the battery pack is prolonged, and the safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery pack protection, and in particular to a battery pack protection device and a protection method. Background Art

[0002] With the development of battery technology, battery life and safety issues are receiving more and more attention.

[0003] The battery pack can be discharged to the electrical equipment or charged by the charger. During the charging and discharging process, some abnormal charging and discharging will inevitably occur.

[0004] For battery packs without communication functions, it is difficult to detect abnormalities during the charging and discharging process of the battery pack, so that the battery pack cannot be protected in time in the event of abnormal charging and discharging, affecting the battery life and safety of use. Summary of the invention

[0005] The present invention provides a battery pack protection device and a protection method, so as to timely cut off the charge and discharge circuit to protect the battery pack when the battery pack without communication function is in an abnormal charge and discharge state, thereby extending the service life of the battery pack and improving safety.

[0006] According to one aspect of the present invention, there is provided a battery pack protection device, comprising: a control module, a measurement module and at least one connection circuit;

[0007] The control module is electrically connected to the measuring module, and the measuring module is used to obtain the working parameters of the battery pack during the charging and discharging process of the battery pack;

[0008] The connection circuit includes a first connection end and a second connection end, the first connection end is used to connect the battery pack, and the second connection end is used to connect the device to be charged and discharged to form at least one charge and discharge loop;

[0009] A switch module is provided in the connection circuit, and the switch module is electrically connected to the control module;

[0010] The control module is used to control at least one switch module to disconnect when it is determined according to the operating parameters that an abnormal charging and discharging state occurs during the charging and discharging process of the battery pack.

[0011] Optionally, the measurement module includes at least one current measurement unit, the current measurement unit and the switch module are connected in series in the connection line, and the current measurement unit is used to detect the charge and discharge current of the charge and discharge circuit; the abnormal charge and discharge state includes the abnormal current state;

[0012] The current measuring unit is electrically connected to the control module, and the control module is used to control the switch module in the charge and discharge circuit where the current measuring unit is located to disconnect or control all switch modules to disconnect when determining that the charge and discharge circuit has an abnormal current state according to the charge and discharge current.

[0013] Optionally, the measurement module includes a voltage measurement unit, which is electrically connected to the first connection end and is used to measure the voltage of the battery pack; the abnormal charge and discharge state includes a battery pack overvoltage abnormality and a battery pack undervoltage abnormality; the voltage measurement unit is electrically connected to the control module, and the control module is also used to determine that a battery pack undervoltage abnormality occurs when the voltage of the battery pack is less than a first voltage threshold; and to determine that a battery pack overvoltage abnormality occurs when the voltage of the battery pack is greater than a second voltage threshold; the control module is also used to control each switch module to be disconnected when it is determined that a battery pack undervoltage abnormality or a battery pack overvoltage abnormality occurs;

[0014] The second voltage threshold is greater than the first voltage threshold.

[0015] Optionally, the battery pack includes at least one power device, and the power device and the switch module are connected in series in the charge and discharge circuit during the charge and discharge process of the battery pack;

[0016] The measuring module includes at least one current measuring unit and a voltage measuring unit. The current measuring unit is connected in series with the switch module in the connection line. The current measuring unit is used to detect the charge and discharge current of the charge and discharge circuit in which it is located; the voltage measuring unit is electrically connected to the first connection end and is used to measure the voltage of the battery pack; the current measuring unit and the voltage measuring unit are electrically connected to the control module respectively; the charge and discharge circuit includes a charging circuit and / or a discharging circuit, and the charge and discharge current includes a charging current and / or a discharging current;

[0017] The control module is used to determine that a battery pack undervoltage anomaly occurs when the voltage of the battery pack is less than a first voltage threshold and the discharge current of at least one discharge circuit is greater than a first preset current threshold; and is used to determine that a battery pack overvoltage anomaly occurs when the voltage of the battery pack is greater than a second voltage threshold and the charging current of at least one charging circuit is greater than a second preset current threshold; the control module is also used to control each switch module to be disconnected when it is determined that a battery pack undervoltage anomaly or a battery pack overvoltage anomaly occurs;

[0018] Among them, the second voltage threshold is greater than the first voltage threshold; the abnormal charging and discharging state includes battery pack undervoltage abnormality and battery pack overvoltage abnormality.

[0019] Optionally, the battery pack protection device also includes a temperature measuring unit, which is connected to the first connection end and is used to measure the terminal temperature of the first connection end; the control module is electrically connected to the temperature measuring unit, and is used to determine the internal temperature of the battery pack based on the terminal temperature, and when it is determined that the battery pack is in an abnormal temperature state based on the internal temperature, control all switch modules to disconnect.

[0020] Optionally, the battery pack protection device also includes an alarm module, which is electrically connected to the control module. The alarm module is used to control the alarm module to send an alarm signal when an abnormal charging or discharging state occurs.

[0021] Optionally, the pool package protection device also includes a receiving release module, which is electrically connected to the control module and is used to receive an alarm release instruction; the control module is used to control the alarm module to release the alarm according to the alarm release instruction and control the switch module to close.

[0022] Optionally, the connection circuit includes a first connection circuit and a second connection circuit; the first connection end includes a first positive electrode connection end and a first negative electrode connection end, and the second connection end includes a second positive electrode connection end and a second negative electrode connection end;

[0023] Two ends of the first connection line are respectively connected to the first positive electrode connection end and the second positive electrode connection end, and two ends of the second connection line are respectively connected to the second positive electrode connection end and the second negative electrode connection end;

[0024] The first positive connection terminal is used to connect the positive electrode of the battery pack, and the second positive connection terminal is used to connect the positive electrode of the device to be charged and discharged; the first negative connection terminal is used to connect the negative electrode of the battery pack, and the second negative connection terminal is used to connect the negative electrode of the device to be charged and discharged; the switch module is arranged in the first connection line or the second connection line.

[0025] According to another aspect of the present invention, a battery pack protection method is provided, which is applied to a battery pack protection device, the protection device comprising: a control module, a measurement module and a plurality of connection circuits, wherein a switch module is provided in the connection circuit;

[0026] Protection methods include:

[0027] During the charging and discharging process of the battery pack, determining whether an abnormal charging and discharging state occurs according to the operating parameters of the battery pack measured by the measurement module;

[0028] If an abnormal charging and discharging state occurs, the control enters an abnormality handling process to control at least one switch module to be disconnected.

[0029] Optionally, the pool package protection device further includes an alarm module and a receiving release module;

[0030] The exception handling process also includes:

[0031] Control the alarm module to send out an alarm signal, and control at least one switch module to disconnect;

[0032] Obtaining the instruction received by the receiving release module;

[0033] If a de-alarm instruction is received, the control enters the de-alarm process to de-alarm and close the switch module.

[0034] Optionally, the abnormal charge and discharge state includes an abnormal voltage state, an abnormal current state and an abnormal temperature state; the working parameters include the charge and discharge current in the charge and discharge circuit, the battery pack voltage and the terminal temperature of the first connection end of the protection device;

[0035] During the charging and discharging process of the battery pack, whether an abnormal charging and discharging state occurs is determined based on the operating parameters of the battery pack measured by the measurement module, including:

[0036] Determine whether an abnormal temperature state occurs based on the terminal temperature;

[0037] Determine whether there is an abnormal current state based on the charge and discharge current;

[0038] Determine whether there is an abnormal voltage state according to the battery pack voltage;

[0039] If an abnormal charging or discharging state occurs, the control enters the abnormal handling process, including:

[0040] If an abnormal temperature state occurs, the control enters the abnormal temperature processing flow to disconnect each switch module;

[0041] If an abnormal current state occurs, the control enters the overcurrent abnormality processing flow to disconnect the switch module in the charge and discharge circuit where the abnormal current state occurs or disconnect each switch module;

[0042] If an abnormal voltage state occurs, the control enters the abnormal voltage processing flow to disconnect each switch module.

[0043] Optionally, the temperature abnormality state includes a battery pack under-temperature abnormality and a battery pack over-temperature abnormality; the abnormality handling process includes a temperature abnormality handling process and an over-temperature abnormality handling process;

[0044] Determine whether there is an abnormal temperature condition based on the terminal temperature, including:

[0045] Determine the internal temperature of the battery pack based on the terminal temperature;

[0046] When the internal temperature is less than the first temperature threshold, it is determined that the battery pack is under-temperature abnormal; when the temperature of the battery pack is greater than the second temperature threshold, it is determined that the battery pack is over-temperature abnormal;

[0047] If a temperature abnormality occurs, the control enters the temperature abnormality processing flow to disconnect each switch module, including: if a battery pack under-temperature abnormality occurs, the control enters the under-temperature abnormality processing flow; if a battery pack under-temperature abnormality occurs, the control enters the over-temperature abnormality processing flow;

[0048] The under-temperature abnormality handling process includes:

[0049] The control alarm module sends out a first alarm signal, and controls the disconnection of each switch module for under-temperature protection;

[0050] Acquire the terminal temperature and obtain the instruction received by the receiving release module;

[0051] If a de-alarm command is received, the control enters the de-alarm process to de-alarm and close the switch module;

[0052] If the alarm release command is not received, determine whether the under-temperature protection is released based on the terminal temperature;

[0053] When the under-temperature protection is released, the alarm module is controlled to release the alarm and the switch module is controlled to close;

[0054] The over-temperature abnormality handling process includes:

[0055] The control alarm module sends out a second alarm signal, and controls the disconnection of each switch module for over-temperature protection;

[0056] Acquire the terminal temperature and obtain the instruction received by the receiving release module;

[0057] If a de-alarm command is received, the control enters the de-alarm process to de-alarm and close the switch module;

[0058] If the alarm release command is not received, determine whether the over-temperature protection is released based on the terminal temperature;

[0059] When the over-temperature protection is released, the alarm module is controlled to release the alarm and the switch module is controlled to close.

[0060] Optionally, determining whether there is an abnormal current state according to the charge and discharge current includes:

[0061] When the charge and discharge current is greater than the charge and discharge current threshold, it is determined that an abnormal current state occurs;

[0062] The overcurrent exception handling process includes:

[0063] The control alarm module sends a third alarm signal to control the disconnection of the switch module in the charge and discharge circuit where the current abnormality occurs or disconnects each switch module;

[0064] Obtaining the instruction received by the receiving release module;

[0065] If a de-alarm instruction is received, the control enters the de-alarm process to de-alarm and close the switch module.

[0066] Optionally, the voltage abnormal state includes a battery pack undervoltage abnormality and a battery pack overvoltage abnormality; the abnormality handling process includes an undervoltage abnormality handling process and an overvoltage abnormality handling process;

[0067] Determining whether there is a voltage abnormality state according to the battery pack voltage includes: determining that a battery pack undervoltage abnormality occurs when the battery pack voltage is less than a first voltage threshold; determining that a battery pack overvoltage abnormality occurs when the battery pack voltage is greater than a second voltage threshold;

[0068] If a voltage abnormality occurs, the control enters the voltage abnormality processing flow to disconnect each switch module, including: if a battery pack undervoltage abnormality occurs, the control enters the undervoltage abnormality processing flow; if a battery pack undervoltage abnormality occurs, the control enters the overvoltage abnormality processing flow;

[0069] The undervoltage exception handling process includes:

[0070] The control alarm module sends out a fourth alarm signal, and controls the disconnection of each switch module for undervoltage protection;

[0071] Obtain the battery pack voltage and obtain the instruction received by the receiving release module;

[0072] If a de-alarm command is received, the control enters the de-alarm process to de-alarm and close the switch module;

[0073] If the alarm release command is not received, determine whether the undervoltage protection is released based on the battery pack voltage;

[0074] When the undervoltage protection is released, the alarm module is controlled to release the alarm and the switch module is controlled to close;

[0075] The overvoltage abnormality handling process includes:

[0076] The control alarm module sends out a fifth alarm signal, and controls the disconnection of each switch module for overvoltage protection;

[0077] Obtain the battery pack voltage and obtain the instruction received by the receiving release module;

[0078] If a de-alarm command is received, the control enters the de-alarm process to de-alarm and close the switch module;

[0079] If the alarm release command is not received, determine whether the overvoltage protection is released based on the battery pack voltage;

[0080] When the overvoltage protection is released, the alarm module is controlled to release the alarm and the switch module is controlled to close.

[0081] Optionally, when the voltage of the battery pack is less than a first voltage threshold, determining that the battery pack undervoltage abnormality occurs includes: when the voltage of the battery pack is less than the first voltage threshold and the discharge current of at least one discharge circuit is greater than a first preset current threshold, determining that the battery pack undervoltage abnormality occurs;

[0082] When the voltage of the battery pack is greater than the second voltage threshold, it is determined that the battery pack overvoltage abnormality occurs, including: when the voltage of the battery pack is greater than the second voltage threshold and the charging current of at least one charging circuit is greater than the second preset current threshold, it is determined that the battery pack overvoltage abnormality occurs.

[0083] Optionally, the alarm clearing process includes:

[0084] Control the alarm module to stop sending alarm signals and control each switch module to close;

[0085] A countdown is performed, and after the countdown ends, the process returns to the step of determining whether an abnormal charging and discharging state occurs during the charging and discharging process of the battery pack according to the working parameters of the battery pack measured by the measuring module.

[0086] The technical solution of the embodiment of the present invention is to connect the battery pack and the equipment to be charged and discharged through the connecting lines of the protection device to form a charging and discharging circuit, and the measuring module measures the working parameters of the battery pack; during the charging and discharging process of the battery pack, the control module determines that an abnormal charging and discharging state occurs according to the working parameters of the battery pack, and controls the switch module in at least one connecting line to be disconnected. For a battery pack without a communication function, the abnormal charging and discharging situation can also be timely judged through the working parameters measured by the measuring module, so that when an abnormal charging and discharging state occurs during the charging and discharging process of the battery pack, the charging and discharging circuit can be disconnected in time, thereby protecting the battery pack, extending the service life of the battery pack, and improving safety.

[0087] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0088] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0089] Figure 1 is a structural schematic diagram of a battery pack protection device provided by an embodiment of the present invention;

[0090] Figure 2 is a schematic structural diagram of another battery pack protection device provided by an embodiment of the present invention;

[0091] Figure 3 is a schematic structural diagram of another battery pack protection device provided by an embodiment of the present invention;

[0092] Figure 4 is a structural schematic diagram of another battery pack protection device provided by an embodiment of the present invention;

[0093] Figure 5 is a schematic structural diagram of another battery pack protection device provided by an embodiment of the present invention;

[0094] Figure 6 is a schematic structural diagram of another battery pack protection device provided by an embodiment of the present invention;

[0095] Figure 7 is a schematic structural diagram of another battery pack protection device provided by an embodiment of the present invention;

[0096] Figure 8 is a structural schematic diagram of another battery pack protection device provided by an embodiment of the present invention;

[0097] Fig. 9 is a schematic structural diagram of another battery pack protection device provided by an embodiment of the present invention;

[0098] Fig.10 is a flow chart of a battery pack protection method provided by an embodiment of the present invention;

[0099] Fig.11 is a flow chart of another battery pack protection method provided by an embodiment of the present invention;

[0100] Fig.12 is a flow chart of another battery pack protection method provided by an embodiment of the present invention;

[0101] Fig.13 is a flow chart of another battery pack protection method provided by an embodiment of the present invention;

[0102] Fig.14 is a flow chart of an under-temperature protection process provided by an embodiment of the present invention;

[0103] Fig.15 is a flow chart of an over-temperature protection process provided by an embodiment of the present invention;

[0104] Fig.16 is a flow chart of an overcurrent protection process provided by an embodiment of the present invention;

[0105] Fig.17 is a flow chart of an undervoltage protection process provided by an embodiment of the present invention;

[0106] Fig.18 is a flow chart of an overvoltage protection process provided by an embodiment of the present invention;

[0107] Fig.19The present invention provides a flowchart of an alarm release process. DETAILED DESCRIPTION

[0108] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below 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 of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0109] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0110] An embodiment of the present invention provides a battery pack protection device, which can be used to protect a battery pack without a communication function during the charging and discharging process. Figure 1 is a schematic diagram of a battery pack protection device provided by an embodiment of the present invention, with reference to Figure 1 The battery pack protection device 100 includes: a control module 110, a measuring module 120 and at least one connecting circuit 130; the control module 110 is electrically connected to the measuring module 120, and the measuring module 120 is used to obtain the working parameters of the battery pack during the charging and discharging process of the battery pack; the connecting circuit 130 includes a first connecting terminal Vin and a second connecting terminal Vout, the first connecting terminal Vin is used to connect the battery pack 200, and the second connecting terminal Vout is used to connect the device to be charged and discharged 300 to form at least one charging and discharging circuit; a switch module 140 is provided in the connecting circuit 130, and the switch module 140 is electrically connected to the control module 110; the control module 110 is used to control at least one switch module 140 to disconnect when it is determined according to the working parameters that an abnormal charging and discharging state occurs during the charging and discharging process of the battery pack.

[0111] Specifically, when the battery pack needs to be charged and discharged, the battery pack protection device 100 can be connected to the battery pack 200 and the device to be charged and discharged 300 through the connecting line 130 to form a charging and discharging loop. It should be noted that in each embodiment of the present invention, "charging and discharging" includes charging and / or discharging. Exemplarily, the charging and discharging process includes a charging process and / or a discharging process. The device to be charged and discharged 300 includes a device to be charged and / or a device to be discharged. The charging and discharging current includes a charging current and / or a discharging current. When the battery pack is discharged to the outside, the battery pack 100 can be connected to the device to be charged 300 through the connecting line 130, for example, the device to be charged 300 includes a load; when the battery pack 200 is charged externally, the battery pack 200 can be connected to the device to be discharged 300 through the connecting line 130, for example, the device to be discharged 300 includes a charger. Since the battery pack 200 usually includes at least one input and output, in the embodiment of the present invention, the battery pack includes at least one connecting line 130 to match the number of inputs and outputs of different battery packs.

[0112] The measuring module 120 can measure the working parameters of the battery pack. The control module 110 can obtain the working parameters of the battery pack in time through the measuring module 120 and determine whether the battery pack has an abnormal charge and discharge state during the charge and discharge process according to the working parameters of the battery pack. When the abnormal charge and discharge state occurs, at least one switch module 140 is promptly controlled to be disconnected to protect the battery pack, extend the service life of the battery pack, and improve the safety of charge and discharge. In some optional embodiments of the present invention, when the control module 110 determines that the battery pack has an abnormal charge and discharge state during the charge and discharge process according to the working parameters of the battery pack, it can control all the switch modules 140 in all the connection lines 130 to be disconnected to provide more adequate protection for the battery pack. Exemplarily, the working parameters of the battery pack include but are not limited to the charge and discharge current, the battery pack voltage, the external temperature of the battery pack, etc., wherein the external temperature of the battery pack can be obtained by measuring the temperature of the first connection end of the protection device. Accordingly, the abnormal charge and discharge state includes but is not limited to the abnormal current state, the abnormal voltage state and the abnormal temperature state. Among them, the switch module 140 includes at least one switch device.

[0113] The battery pack protection device of the present embodiment connects the battery pack and the equipment to be charged and discharged through the connection lines of the protection device to form a charge and discharge circuit, and the measuring module measures the working parameters of the battery pack. During the charge and discharge process of the battery pack, the control module determines that an abnormal charge and discharge state occurs according to the working parameters of the battery pack, and controls the switch module in at least one connection line to disconnect. Even for a battery pack without a communication function, the abnormal charge and discharge situation can be timely determined through the working parameters measured by the measuring module, so that when an abnormal charge and discharge state occurs during the charge and discharge process of the battery pack, the charge and discharge circuit can be disconnected in time, thereby protecting the battery pack, extending the service life of the battery pack, and improving safety.

[0114] Figure 2 is a schematic structural diagram of another battery pack protection device provided by an embodiment of the present invention, Figure 3 is a schematic structural diagram of another battery pack protection device provided by an embodiment of the present invention, Figure 4 is a structural schematic diagram of another battery pack protection device provided by an embodiment of the present invention, Figure 5 is a schematic diagram of the structure of another battery pack protection device provided by an embodiment of the present invention, referring to Figure 2-Figure 5 In some optional embodiments of the present invention, the connection circuit 130 includes a first connection circuit 131 and a second connection circuit 132; the first connection terminal Vin includes a first positive connection terminal Vin+ and a first negative connection terminal Vin-, and the second connection terminal Vout includes a second positive connection terminal Vout+ and a second negative connection terminal Vout-; the two ends of the first connection circuit 131 are respectively connected to the first positive connection terminal Vin+ and the second positive connection terminal Vout+, and the two ends of the second connection circuit 132 are respectively connected to the second positive connection terminal Vout+ and the second negative connection terminal Vout-; the first positive connection terminal Vin+ is used to connect the positive electrode of the battery pack, and the second positive connection terminal Vout+ is used to connect the positive electrode of the device to be charged and discharged 300; the first negative connection terminal Vin- is used to connect the negative electrode of the battery pack, and the second negative connection terminal Vout- is used to connect the negative electrode of the device to be charged and discharged 300; the switch module 140 is arranged on the first connection circuit 131 or the second connection circuit 132.

[0115] Specifically, the battery pack includes a positive electrode and a negative electrode, and the device to be charged and discharged also includes a positive electrode and a negative electrode. Accordingly, the connection line 130 includes a first connection line 131 connecting the positive electrode of the battery pack and the positive electrode of the device to be charged and discharged, and a second connection line 132 connecting the negative electrode of the battery pack and the negative electrode of the device to be charged and discharged. In some optional embodiments of the present invention, the device to be charged and discharged may not be divided into positive and negative electrodes. In this case, the first connection line 131 and the second connection line 132 are respectively connected to the two ends of the device to be charged and discharged. The embodiments of the present invention are not specifically limited here.

[0116] like Figure 2 and Figure 3 As shown, in some optional embodiments of the present invention, the battery pack protection device includes a connection circuit 130, which can be applicable to a battery pack including one input and output. Figure 4 and Figure 5 As shown, in another optional embodiment of the present invention, the battery pack protection device includes at least two connection lines 130, which can be applicable to a battery pack including at least two input and output channels. Figure 4 and Figure 5The example shows that the battery pack protection device includes three connection lines 130. For any connection line 130, if Figure 2 and Figure 4 As shown, the switch module 140 can be arranged in the first connecting line 131; Figure 3 and Figure 5 As shown, the switch module 140 may also be disposed in the second connecting line 132. Figure 4 and Figure 5 As shown, in the first connection circuit of the three connection circuits of the battery pack protection device, the first connection terminal includes the first positive connection terminal A Vin1+, the first negative connection terminal A Vin1-, and the second connection terminal includes the second positive connection terminal A Vout1+, and the second negative connection terminal A Vout1-; in the second connection circuit, the first connection terminal includes the first positive connection terminal B Vin2+, the first negative connection terminal B Vin2-, and the second connection terminal includes the second positive connection terminal B Vout2+, and the second negative connection terminal B Vout2-; in the third connection circuit, the first connection terminal includes the first positive connection terminal C Vin3+, the first negative connection terminal C Vin3-, and the second connection terminal includes the second positive connection terminal C Vout3+, and the second negative connection terminal C Vout3-. In the first connection circuit of the three connection circuits of the battery pack, the switch module 140 includes the first switch device S1, in the second connection circuit, the switch module 140 includes the second switch device S2, and in the third connection circuit, the switch module 140 includes the third switch device S3.

[0117] refer to Figure 2-Figure 5 Optionally, the measuring module 120 includes at least one current measuring unit 121, the current measuring unit 121 and the switch module 140 are connected in series to the connecting line 130, and the current measuring unit 121 is used to detect the charging and discharging current of the charging and discharging circuit; the abnormal charging and discharging state includes the abnormal current state;

[0118] The current measuring unit 121 is electrically connected to the control module 110. The control module 110 is used to control the switch module 140 in the charge and discharge circuit where the current measuring unit 121 is located to disconnect or control all switch modules 140 to disconnect when the charge and discharge circuit determines that there is an abnormal current state according to the charge and discharge current.

[0119] Optionally, each connection line 130 is provided with a current measuring unit 121, and the current measuring unit 121 can measure the current in the connection line 130, that is, measure the charge and discharge current in the charge and discharge circuit in the process of charging and discharging the battery pack. In the charging circuit, the current measuring unit 121 can measure the charging current; in the discharging circuit, the current measuring unit 121 can measure the discharging current. In this embodiment, the control module 110 can determine whether there is an abnormal current state in the charge and discharge circuit where the current measuring unit 121 is located according to the charge and discharge current measured by the current measuring unit 121. For example, an overcurrent threshold can be pre-set, and when the charge and discharge current is greater than the corresponding overcurrent threshold, it is determined that there is an abnormal current state (the charging current of the charging circuit is greater than the corresponding charging overcurrent threshold to determine that there is an abnormal charging current state; the discharge current of the discharge circuit is greater than the corresponding discharge current threshold to determine that there is an abnormal discharge current state). In this case, the control module 110 can control the switch module 140 in the charge and discharge circuit where the current measuring unit 121 is located to disconnect to protect the battery pack. In some optional embodiments, in order to fully maintain the battery pack, the control module 110 may control the switch modules 140 in all the charging and discharging circuits to be disconnected when determining that an abnormal current state occurs.

[0120] Figure 6 is a schematic diagram of the structure of another battery pack protection device provided by an embodiment of the present invention, referring to Figure 6 Optionally, the measurement module includes a voltage measurement unit 122, which is electrically connected to the first connection end and is used to measure the voltage of the battery pack; the abnormal charging and discharging state includes the battery pack overvoltage abnormality and the battery pack undervoltage abnormality; the voltage measurement unit 122 is electrically connected to the control module 110, and the control module 110 is also used to determine that a battery pack undervoltage abnormality occurs when the voltage of the battery pack is less than a first voltage threshold; and to determine that a battery pack overvoltage abnormality occurs when the voltage of the battery pack is greater than a second voltage threshold; the control module 110 is also used to control each switch module 140 to be disconnected when it is determined that a battery pack undervoltage abnormality or a battery pack overvoltage abnormality occurs; wherein the second voltage threshold is greater than the first voltage threshold.

[0121] As described above, the first connection terminal Vin includes a first positive connection terminal Vin+ and a first negative connection terminal Vin-, and the voltage measuring unit 122 can be electrically connected to the first positive connection terminal Vin+ and the first negative connection terminal Vin-, and the voltage between the first positive connection terminal Vin+ and the first negative connection terminal Vin- is determined as the battery pack voltage. The control module 110 can pre-store the first voltage threshold and the second voltage threshold. The control module 110 determines whether the battery pack has an undervoltage anomaly based on the magnitude relationship between the battery pack voltage measured by the voltage measuring unit 122 and the first voltage threshold, and determines whether the battery pack has an overvoltage anomaly based on the magnitude relationship between the battery pack voltage and the second voltage threshold. When it is determined that there is an overvoltage anomaly or an undervoltage anomaly, the control module 110 can control each switch module 140 to disconnect, thereby timely protecting the battery pack when a voltage anomaly occurs. It should be noted that, in the present embodiment, the method for judging undervoltage anomaly and overvoltage anomaly of the battery pack can be applicable to the battery pack that does not include a protection board inside the battery pack. For the battery pack that does not include a protection board, in the charge and discharge circuit of the battery pack, the switch module 140 is used to control the opening or closing of the charge and discharge circuit.

[0122] In some optional embodiments of the present invention, a protection board is provided inside the battery pack, and a power device is provided on the protection board. Figure 7 1 is a schematic diagram of the structure of another battery pack protection device provided by an embodiment of the present invention. Optionally, the battery pack includes at least one power device inside. During the charging and discharging process of the battery pack, the power device is connected in series with the switch module 140 in the charging and discharging circuit; the measuring module includes at least one current measuring unit 121 and a voltage measuring unit 122. The current measuring unit 121 is connected in series with the switch module 140 in the connecting line 130. The current measuring unit 121 is used to detect the charging and discharging current of the charging and discharging circuit; the voltage measuring unit 122 is electrically connected to the first connecting terminal (specifically, the first positive connecting terminal Vin+ and the first negative connecting terminal Vin-), and is used to measure the voltage of the battery pack; the current measuring unit 121 and the voltage measuring unit 122 are respectively connected to the control module The control module 110 is electrically connected to the control block 110; the charge and discharge circuit includes a charging circuit and / or a discharging circuit, and the charge and discharge current includes a charging current and / or a discharging current; the control module 110 is used to determine that a battery pack undervoltage abnormality occurs when the voltage of the battery pack is less than a first voltage threshold and the discharge current of at least one discharge circuit is greater than a first preset current threshold; and is used to determine that a battery pack overvoltage abnormality occurs when the voltage of the battery pack is greater than a second voltage threshold and the charging current of at least one charging circuit is greater than a second preset current threshold; the control module 110 is also used to control each switch module 140 to be disconnected when it is determined that a battery pack undervoltage abnormality or a battery pack overvoltage abnormality occurs; wherein the second voltage threshold is greater than the first voltage threshold; the abnormal charge and discharge state includes a battery pack undervoltage abnormality and a battery pack overvoltage abnormality.

[0123] When charging and discharging the battery pack, the power device and the switch module 140 are connected in series in the charge and discharge circuit. For the battery pack including the protection board, the disconnection or closing of the charge and discharge circuit can be controlled by controlling the conduction state of the power device or the conduction state of the switch module 140 in the protection device. Since the power device may be stuck during the use of the battery pack, in the abnormal state of the power device adhesion, the power device is stuck and cannot timely convert the conduction state of the charge and discharge circuit. In this case, the protection device can provide secondary protection for the battery pack, and disconnect the charge and discharge circuit by disconnecting the switch module 140 in the protection device, so as to further provide protection for the battery pack and ensure the service life and charge and discharge safety of the battery pack. Specifically, for the battery pack including the protection board, when the voltage of the battery pack is less than the first voltage threshold and the discharge current of at least one discharge circuit is greater than the first preset current threshold, it means that the undervoltage protection of the battery pack is not achieved by disconnecting the power device. In this case, it is determined that the battery pack undervoltage abnormality occurs, and the control module 110 realizes the secondary protection of the battery pack by controlling the switch module 140 to disconnect. When the voltage of the battery pack is greater than the second voltage threshold and the charging current of at least one charging circuit is greater than the second preset current threshold, it means that overvoltage protection of the battery pack is not achieved by disconnecting the power device. In this case, it is determined that the battery pack overvoltage abnormality occurs, and the control module 110 implements secondary protection of the battery pack by controlling the switch module 140 to disconnect.

[0124] Among them, the first preset current threshold and the second preset current threshold can be set according to actual needs. When the discharge current of the discharge circuit is greater than the first preset current threshold, it can be considered that the battery pack is discharging externally; when the charging current of the charging circuit is greater than the second preset current threshold, it can be considered that the battery pack is being charged externally.

[0125] Figure 8 is a schematic diagram of the structure of another battery pack protection device provided by an embodiment of the present invention, with reference to Figure 8 Optionally, the battery pack protection device also includes a temperature measuring unit 123, which is connected to the first connection end and is used to measure the terminal temperature of the first connection end; the control module 110 is electrically connected to the temperature measuring unit 123, and is used to determine the internal temperature of the battery pack according to the terminal temperature, and when it is determined that the battery pack is in an abnormal temperature state according to the internal temperature, control each switch module 140 to be disconnected.

[0126] refer to Figure 8Optionally, the temperature measurement unit 123 is in contact with the first negative electrical terminal Vin-. The control module 110 may be electrically connected to the temperature measurement unit 123. The control module 110 may estimate the internal temperature of the battery pack based on the terminal temperature of the first connection terminal measured by the temperature measurement unit 123, and then determine whether an abnormal temperature state occurs based on the internal temperature of the battery pack. When it is determined that an abnormal temperature state occurs, the control module 110 controls the disconnection of the switch modules 140 in each connection line 130, thereby protecting the battery pack. Optionally, a calculation method for determining the internal temperature of the battery pack based on the terminal temperature is pre-stored in the control module 110. After obtaining the terminal temperature, the control module 110 may calculate the internal temperature of the battery pack based on the pre-stored calculation method.

[0127] Fig. 9 is a schematic diagram of the structure of another battery pack protection device provided by an embodiment of the present invention, referring to Fig. 9 Optionally, the battery pack protection device further includes an alarm module 150, which is electrically connected to the control module 110. The alarm module 150 is used to control the alarm module 150 to send an alarm signal when an abnormal charging or discharging state occurs.

[0128] Optionally, the alarm module 150 may include a sound alarm unit and / or a light alarm unit. The sound alarm unit may send out a sound alarm signal, and the light alarm unit may send out a light alarm signal. Among them, the control module 110 may control the alarm module 150 to send out different alarm signals according to the abnormal charging and discharging state, so that the user can determine the type of abnormal charging and discharging state that occurs in the current charging and discharging process according to the alarm signal, and then take corresponding measures. Exemplarily, when an abnormal temperature state occurs, stop using the battery pack. When an abnormal charging current state occurs, remove the charger; when an abnormal discharging current state occurs, remove the load. When an abnormal undervoltage occurs in the battery pack, charge the battery pack; when an abnormal overvoltage occurs in the battery pack, discharge the battery pack to the outside.

[0129] Continue to refer Fig. 9 Optionally, the battery pack protection device also includes a receiving release module 160, which is electrically connected to the control module 110 and is used to receive an alarm release instruction; the control module 110 is used to control the alarm module 150 to release the alarm according to the alarm release instruction, and control the switch module 140 to close.

[0130] In some optional embodiments of the present invention, the receiving release module 160 may include a button, and accordingly, the alarm release instruction may be a touch action. The control module 110 controls the alarm module 150 to stop sending an alarm signal to release the alarm according to the alarm release instruction, and controls the switch module 140 to close, so that the protection device re-detects the abnormal charging and discharging state.

[0131] An embodiment of the present invention provides a method for protecting a battery pack, which can be applied to a battery pack protection device of any of the above embodiments of the present invention, wherein the protection device includes a control module, a measurement module, and at least one connection circuit, wherein a switch module is provided in the connection circuit. The protection method can be executed by the control module in the protection device. Fig.10 is a flowchart of a battery pack protection method provided by an embodiment of the present invention, referring to Fig.10 The protection method of the battery pack includes the normal working process of the protection device, refer to Fig.10 , the normal working process includes:

[0132] S210. During the charging and discharging process of the battery pack, determine whether an abnormal charging and discharging state occurs according to the operating parameters of the battery pack measured by the measurement module; if so, execute the following S220.

[0133] S220, control entering into an exception handling process to control at least one switch module to be disconnected.

[0134] Specifically, the abnormality handling process includes controlling at least one switch module to be disconnected, so that when an abnormal charge and discharge state occurs during the charge and discharge process, the charge and discharge circuit can be disconnected to protect the battery pack.

[0135] If no abnormal charge and discharge state occurs, it is further determined whether an abnormal charge and discharge state occurs according to the operating parameters of the battery pack measured by the measurement module.

[0136] In some optional embodiments of the present invention, the battery pack protection device also includes an alarm module and a receiving release module; the exception handling process also includes: controlling the alarm module to send an alarm signal and controlling at least one switch module to disconnect; obtaining the instruction received by the receiving release module; if an alarm release instruction is received, controlling to enter the alarm release process to release the alarm and close the switch module.

[0137] Optionally, the control module can control the alarm module to send a corresponding alarm signal according to the state type of the abnormal charge and discharge state, and the abnormal charge and discharge states of different state types can correspond to different alarm signals. In addition, the control module can control the switch module in the charge and discharge circuit where the abnormal charge and discharge state occurs to be disconnected, or the switch modules in all charge and discharge circuits are disconnected according to the state type of the abnormal charge and discharge state. In some cases, the user can take corresponding measures after receiving the alarm signal; or the user believes that there may be a false alarm after receiving the alarm signal. In the above two cases, it is necessary to detect the working parameters of the battery pack again and determine whether the abnormal charge and discharge state occurs. In this embodiment, it is set that after controlling at least one switch module to be disconnected, the abnormal handling process also includes periodically obtaining the instructions received by the receiving release module. If the alarm release instruction is received, the control enters the alarm release process to release the alarm and close the switch module, the protection device can continue to protect the battery pack, and the control module executes the normal working process again to meet the actual needs of the above two situations. That is, the user can input the alarm release instruction to the protection device through the receiving release module, so that the control module can release the alarm of the alarm module according to the alarm release instruction and execute the normal working process again.

[0138] The battery pack protection method of the embodiment of the present invention is applied to the battery pack protection device of any of the above embodiments of the present invention, and has the beneficial effects of the battery pack protection device of any of the above embodiments of the present invention.

[0139] On the basis of the above embodiment, optionally, the abnormal charging and discharging state includes an abnormal voltage state, an abnormal current state and an abnormal temperature state; the working parameters include the charging and discharging current in the charging and discharging circuit, the battery pack voltage and the terminal temperature of the first connection end of the protection device. Fig.11 is a flowchart of another battery pack protection method provided by an embodiment of the present invention, referring to Fig.11 Optionally, in the battery pack protection method, the normal working process includes:

[0140] S301, acquiring charging and discharging current, battery pack voltage, and terminal temperature of a first connection end of a protection device.

[0141] Specifically, the control module can obtain the charge and discharge current through the current measurement unit, obtain the battery pack voltage through the voltage measurement unit, and obtain the terminal temperature through the temperature measurement unit.

[0142] S302, perform a temperature abnormality monitoring process to determine whether a temperature abnormality occurs. If yes, execute S303; if no, execute S304.

[0143] The abnormal temperature state monitoring process may include determining the internal temperature of the battery pack according to the terminal temperature, and determining whether an abnormal temperature state occurs according to the internal temperature of the battery pack.

[0144] S303, entering the temperature abnormality processing flow.

[0145] The temperature abnormality processing process may include controlling the alarm module to send an alarm signal corresponding to the temperature abnormality state and controlling each switch module to disconnect. Obtaining the instruction received by the receiving release module; if the alarm release instruction is received, controlling to enter the alarm release process to release the alarm and close the switch module.

[0146] S304, perform a current abnormality monitoring process to determine whether a current abnormality occurs. If yes, execute S305; if no, execute S306.

[0147] The abnormal current state monitoring process includes determining whether an abnormal current state exists according to the current in the charge and discharge circuit.

[0148] S305, entering into the abnormal current processing flow.

[0149] The abnormal current processing process may include controlling the alarm module to send an alarm signal corresponding to the abnormal current state and controlling each switch module to disconnect. Obtaining the instruction received by the receiving release module; if the alarm release instruction is received, controlling to enter the alarm release process to release the alarm and close the switch module.

[0150] S306: Perform a voltage abnormality monitoring process to determine whether a voltage abnormality occurs. If yes, execute S307; if no, return to execute S301.

[0151] Among them, the abnormal voltage state monitoring process includes determining whether there is an abnormal voltage state based on the battery pack voltage.

[0152] S307, enter the current abnormality processing flow.

[0153] The abnormal voltage processing process may include controlling the alarm module to send an alarm signal corresponding to the abnormal voltage state and controlling each switch module to disconnect. Obtaining the instruction received by the receiving release module; if the alarm release instruction is received, controlling to enter the alarm release process to release the alarm and close the switch module.

[0154] In some optional embodiments of the present invention, the temperature abnormality includes the battery pack under-temperature abnormality and the battery pack over-temperature abnormality; the abnormality handling process includes the temperature abnormality handling process and the over-temperature abnormality handling process. Optionally, the voltage abnormality includes the battery pack under-voltage abnormality and the battery pack over-voltage abnormality; the abnormality handling process includes the under-voltage abnormality handling process and the over-voltage abnormality handling process.

[0155] Fig.12 is a flowchart of another battery pack protection method provided by an embodiment of the present invention, referring to Fig.12 Optionally, the battery pack protection method may be applicable to a battery pack that does not include a protection board. In the battery pack protection method, the normal working process includes:

[0156] S401, acquiring charging and discharging current, battery pack voltage, and terminal temperature of a first connection end of a protection device.

[0157] S402: Determine the internal temperature of the battery pack according to the terminal temperature.

[0158] S403, determine whether the internal temperature is lower than the first temperature threshold; if so, determine that the battery pack is under-temperature abnormal, and execute S404; if not, determine that the battery pack is not under-temperature abnormal, and execute S405.

[0159] S404, enter the under-temperature protection process.

[0160] S405, determine whether the internal temperature is greater than the second temperature threshold; if so, determine that the battery pack has an over-temperature abnormality, and execute S406; if not, determine that the battery pack has no over-temperature abnormality, and execute S407.

[0161] S406, entering the over-temperature protection process.

[0162] S407, determine whether the charge and discharge current is greater than the charge and discharge current threshold; if so, determine that the battery pack has an overcurrent abnormal state, and execute S408; if not, determine that the battery pack has no overcurrent abnormal state, and execute S409.

[0163] Wherein, judging whether the charge and discharge current is greater than the charge and discharge current threshold may include judging whether the charge current in the charge circuit is greater than the charge current threshold and judging whether the discharge current in the discharge circuit is greater than the discharge current threshold.

[0164] S408, entering the overcurrent protection process.

[0165] S409, determine whether the battery pack voltage is lower than the first voltage threshold; if so, determine that the battery pack has an undervoltage abnormality, and execute S410; if not, determine that the battery pack has no undervoltage abnormality, and execute S411.

[0166] S410, entering the undervoltage protection process.

[0167] S411, determine whether the battery pack voltage is greater than the second voltage threshold; if so, determine that the battery pack has an overvoltage abnormality, and execute S412; if not, determine that the battery pack has no overvoltage abnormality, and return to execute S401.

[0168] S412, enter the overvoltage protection process.

[0169] Fig.13 is a flowchart of another battery pack protection method provided by an embodiment of the present invention, referring to Fig.13 Optionally, the battery pack protection method may be applicable to a battery pack including a protection board. In the battery pack protection method, the normal working process includes:

[0170] S501, acquiring charging and discharging current, battery pack voltage, and terminal temperature of a first connection end of a protection device.

[0171] S502: Determine the internal temperature of the battery pack according to the terminal temperature.

[0172] S503, determine whether the internal temperature is lower than the first temperature threshold; if so, determine that the battery pack is under-temperature abnormal, and execute S504; if not, determine that the battery pack is not under-temperature abnormal, and execute S505.

[0173] S504, entering the under-temperature protection process.

[0174] S505, determine whether the internal temperature is greater than the second temperature threshold; if so, determine that the battery pack is over-temperature abnormal, and execute S506; if not, determine that the battery pack is not over-temperature abnormal, and execute S507.

[0175] S506, entering the over-temperature protection process.

[0176] S507, determine whether the charge and discharge current is greater than the charge and discharge current threshold; if so, determine that the battery pack has an overcurrent abnormal state, and execute S508; if not, determine that the battery pack does not have an overcurrent abnormal state, and execute S509.

[0177] Wherein, judging whether the charge and discharge current is greater than the charge and discharge current threshold may include judging whether the charge current in the charge circuit is greater than the charge current threshold and judging whether the discharge current in the discharge circuit is greater than the discharge current threshold.

[0178] S508, entering the overcurrent protection process.

[0179] S509, determine whether the battery pack voltage is lower than the first voltage threshold; if so, execute S510; if not, execute S511.

[0180] S510, determine whether the discharge current of the discharge circuit is greater than a first preset current threshold. If so, determine that the battery pack has an undervoltage abnormality, and execute S512; if not, determine that the battery pack has no undervoltage abnormality, and execute S511.

[0181] Specifically, in S510, it can be determined whether there is at least one discharge current of the discharge reflux greater than the first preset current threshold. If so, S512 is executed; if not, S511 is executed.

[0182] S511, determine whether the battery pack voltage is greater than a second voltage threshold; if so, execute S513; if not, execute S514.

[0183] S512, entering the undervoltage protection process.

[0184] S513: Determine whether the charging current of the charging circuit is greater than a second preset current threshold. If yes, determine that the battery pack has an overvoltage abnormality, and execute S514; if no, determine that the battery pack has no overvoltage abnormality, and return to execute S501.

[0185] Specifically, in S513, it can be determined whether there is at least one charging circuit whose charging current is greater than the second preset current threshold. If so, execute S514; if not, return to execute S501.

[0186] S514, enter the overvoltage protection process.

[0187] Fig.14 is a flow chart of an under-temperature protection process provided by an embodiment of the present invention, refer to Fig.14 Based on the above embodiment, optionally, the under-temperature abnormality processing process includes:

[0188] The control alarm module sends out a first alarm signal, and controls the disconnection of each switch module for under-temperature protection;

[0189] Acquire the terminal temperature and obtain the instruction received by the receiving release module;

[0190] Determine whether a command to cancel the alarm has been received;

[0191] If yes (i.e., receiving the alarm cancellation instruction), the control enters the alarm cancellation process to cancel the alarm and close the switch module;

[0192] If not (i.e., no alarm release command is received), determine whether the under-temperature protection is released based on the terminal temperature;

[0193] If yes (that is, the under-temperature protection is released), the alarm module is controlled to release the alarm and the switch module is controlled to close; then the under-temperature protection process is exited.

[0194] If so (that is, the under-temperature protection is not released), return to the step of obtaining the terminal temperature and obtaining the instruction received by the receiving release module.

[0195] Determining whether the under-temperature protection is released according to the terminal temperature may include determining whether the under-temperature protection is released according to a magnitude relationship between the terminal temperature and a third temperature threshold, wherein the third temperature threshold is greater than the first temperature threshold and less than the second temperature threshold.

[0196] Fig.15 is a flow chart of an over-temperature protection process provided by an embodiment of the present invention, refer to Fig.15 ,Optional,Overtemperature exception handling process includes:

[0197] The control alarm module sends out a second alarm signal, and controls the disconnection of each switch module for over-temperature protection;

[0198] Acquire the terminal temperature and obtain the instruction received by the receiving release module;

[0199] Determine whether a command to cancel the alarm has been received;

[0200] If yes (i.e., receiving the alarm cancellation instruction), the control enters the alarm cancellation process to cancel the alarm and close the switch module;

[0201] If not (i.e., no alarm release command is received), determine whether the over-temperature protection is released based on the terminal temperature;

[0202] If yes (that is, the over-temperature protection is released), the alarm module is controlled to release the alarm and the switch module is controlled to close; then the over-temperature protection process is exited.

[0203] If not (that is, the over-temperature protection is not released), return to the step of obtaining the terminal temperature and obtaining the instruction received by the release module.

[0204] Wherein, determining whether the over-temperature protection is released according to the terminal temperature may include determining whether the over-temperature protection is released according to the magnitude relationship between the terminal temperature and a fourth temperature threshold, wherein the fourth temperature threshold is greater than the first temperature threshold and less than the second temperature threshold. Optionally, the fourth temperature threshold is greater than the third temperature threshold.

[0205] Fig.16 is a flow chart of an overcurrent protection process provided by an embodiment of the present invention, refer to Fig.16 Optionally, the overcurrent protection process includes: controlling the alarm module to send a third alarm signal, controlling the disconnection of the switch module in the charging and discharging circuit where the current abnormality occurs or disconnecting each switch module; obtaining the instruction received by the receiving release module; judging whether the alarm release instruction is released; if so, controlling to enter the alarm release process to release the alarm and close the switch module; if not, returning to the step of obtaining the instruction received by the receiving release module in the overcurrent protection process.

[0206] Fig.17is a flow chart of an undervoltage protection process provided by an embodiment of the present invention, refer to Fig.17 ,Optional,Undervoltage exception handling process includes:

[0207] The control alarm module sends out a fourth alarm signal, and controls the disconnection of each switch module for undervoltage protection;

[0208] Obtain the battery pack voltage and obtain the instruction received by the receiving release module;

[0209] Determine whether a command to cancel the alarm has been received;

[0210] If yes (i.e., receiving the alarm cancellation instruction), the control enters the alarm cancellation process to cancel the alarm and close the switch module;

[0211] If not (i.e., no alarm release command is received), determine whether the undervoltage protection is released based on the battery pack voltage;

[0212] If so (that is, the undervoltage protection is released), the alarm module is controlled to release the alarm and the switch module is controlled to close; then the undervoltage protection process is exited.

[0213] If not (ie, the undervoltage protection is not released), return to the step of obtaining the battery pack voltage and obtaining the instruction received by the release module.

[0214] Among them, determining whether the undervoltage protection is released according to the battery pack voltage may include determining whether the undervoltage protection is released according to the magnitude relationship between the battery pack voltage and a third voltage threshold, wherein the third voltage threshold is greater than the first voltage threshold and less than the second voltage threshold.

[0215] Fig.18 is a flow chart of an overvoltage protection process provided by an embodiment of the present invention, refer to Fig.18 ,Optional,Overvoltage abnormality handling process includes:

[0216] The control alarm module sends out a fifth alarm signal, and controls the disconnection of each switch module for overvoltage protection;

[0217] Obtain the battery pack voltage and obtain the instruction received by the receiving release module;

[0218] Determine whether a command to cancel the alarm has been received;

[0219] If yes (i.e., receiving the alarm cancellation instruction), the control enters the alarm cancellation process to cancel the alarm and close the switch module;

[0220] If not (i.e., no alarm release command is received), determine whether the overvoltage protection is released based on the battery pack voltage;

[0221] If yes (that is, the overvoltage protection is released), the alarm module is controlled to release the alarm and the switch module is controlled to close;

[0222] If so (that is, the overvoltage protection is not released), return to the step of obtaining the battery pack voltage and obtaining the instruction received by the receiving release module.

[0223] Wherein, determining whether the overvoltage protection is released according to the battery pack voltage may include determining whether the overvoltage protection is released according to the magnitude relationship between the battery pack voltage and a fourth voltage threshold, wherein the fourth voltage threshold is greater than the first voltage threshold and less than the second voltage threshold. Optionally, the fourth voltage threshold is greater than the third voltage threshold.

[0224] In the above-mentioned battery pack protection method flow, judgment is made according to the priority order of abnormal charging and discharging states, among which temperature abnormality has the highest priority, because once the temperature of the battery pack is abnormal, it cannot be charged or discharged, otherwise it will affect the life of the battery pack; the second is current abnormality, because after the abnormality occurs, it can be restored by removing the charger or load; the last is voltage abnormality, because voltage abnormality can be restored by reverse charging or discharging (charging when undervoltage, discharging when overvoltage). It should be noted that in other optional embodiments of the present invention, the judgment order of each abnormal charging and discharging state can also be changed according to actual conditions, and this embodiment is not specifically limited here.

[0225] Fig.19 This is a flowchart of an alarm release process provided by an embodiment of the present invention, refer to Fig.19 Based on the above embodiments, optionally, the alarm release process includes:

[0226] The alarm module is controlled to stop sending alarm signals, and each switch module is controlled to close.

[0227] Start the countdown.

[0228] Specifically, in this step, a countdown is started to detect whether the battery pack has a fault.

[0229] Determine whether the countdown is over; if so, perform the normal working process in any of the above embodiments of the present invention; if not, return to the step of performing the countdown. It should be noted that if the countdown is not over, the countdown is accumulated when returning to the step of performing the countdown until the countdown is over.

[0230] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack protection device, characterized in that: include: A control module, a measuring module and at least one connecting line; The control module is electrically connected to the measuring module, and the measuring module is used to obtain the operating parameters of the battery pack during the charging and discharging process of the battery pack; The connection circuit includes a first connection end and a second connection end, the first connection end is used to connect the battery pack, and the second connection end is used to connect the device to be charged and discharged to form at least one charge and discharge loop; A switch module is provided in the connection circuit, and the switch module is electrically connected to the control module; The control module is used to control at least one of the switch modules to disconnect when it is determined according to the operating parameters that an abnormal charging and discharging state occurs during the charging and discharging process of the battery pack.

2. The battery pack protection device according to claim 1, characterized in that: The measuring module comprises at least one current measuring unit, the current measuring unit and the switch module are connected in series in the connecting line, and the current measuring unit is used to detect the charging and discharging current of the charging and discharging circuit; the abnormal charging and discharging state comprises an abnormal current state; The current measuring unit is electrically connected to the control module, and the control module is used to control the switch module in the charge and discharge circuit where the current measuring unit is located to disconnect or control all the switch modules to disconnect when the charge and discharge circuit determines that the current abnormal state exists according to the charge and discharge current.

3. The battery pack protection device according to claim 1, characterized in that: The measurement module includes a voltage measurement unit, which is electrically connected to the first connection terminal and is used to measure the voltage of the battery pack; the abnormal charge and discharge state includes a battery pack overvoltage abnormality and a battery pack undervoltage abnormality; the voltage measurement unit is electrically connected to the control module, and the control module is further used to determine that the battery pack undervoltage abnormality occurs when the voltage of the battery pack is less than a first voltage threshold; and is used to determine that the battery pack overvoltage abnormality occurs when the voltage of the battery pack is greater than a second voltage threshold; the control module is also used to control each of the switch modules to be disconnected when it is determined that the battery pack undervoltage abnormality or the battery pack overvoltage abnormality occurs; The second voltage threshold is greater than the first voltage threshold.

4. The battery pack protection device according to claim 1, characterized in that: The battery pack includes at least one power device inside, and during the charging and discharging process of the battery pack, the power device and the switch module are connected in series in the charging and discharging circuit; The measuring module comprises at least one current measuring unit and a voltage measuring unit, wherein the current measuring unit and the switch module are connected in series in the connecting line, and the current measuring unit is used to detect the charging and discharging current of the charging and discharging circuit; the voltage measuring unit is electrically connected to the first connecting end, and is used to measure the voltage of the battery pack; the current measuring unit and the voltage measuring unit are electrically connected to the control module respectively; the charging and discharging circuit comprises a charging circuit and / or a discharging circuit, and the charging and discharging current comprises a charging current and / or a discharging current; The control module is used to determine that a battery pack undervoltage abnormality occurs when the voltage of the battery pack is less than a first voltage threshold and the discharge current of at least one of the discharge circuits is greater than a first preset current threshold; and used to determine that a battery pack overvoltage abnormality occurs when the voltage of the battery pack is greater than a second voltage threshold and the charging current of at least one of the charging circuits is greater than a second preset current threshold; the control module is also used to control each of the switch modules to be disconnected when it is determined that the battery pack undervoltage abnormality or the battery pack overvoltage abnormality occurs; Among them, the second voltage threshold is greater than the first voltage threshold; the abnormal charging and discharging state includes the battery pack undervoltage abnormality and the battery pack overvoltage abnormality.

5. The battery pack protection device according to claim 1, characterized in that: It also includes a temperature measuring unit, which is connected to the first connection end and is used to measure the terminal temperature of the first connection end; the control module is electrically connected to the temperature measuring unit and is used to determine the internal temperature of the battery pack according to the terminal temperature, and when it is determined that the battery pack is in an abnormal temperature state according to the internal temperature, control each of the switch modules to be disconnected.

6. The battery pack protection device according to claim 1, characterized in that: It also includes an alarm module, which is electrically connected to the control module. The alarm module is used to control the alarm module to send an alarm signal when an abnormal charging and discharging state occurs.

7. The battery pack protection device according to claim 6, characterized in that: It also includes a receiving release module, which is electrically connected to the control module and is used to receive an alarm release instruction; the control module is used to control the alarm module to release the alarm according to the alarm release instruction and control the switch module to close.

8. The battery pack protection device according to any one of claims 1 to 7, characterized in that: The connection circuit includes a first connection circuit and a second connection circuit; the first connection end includes a first positive connection end and a first negative connection end, and the second connection end includes a second positive connection end and a second negative connection end; Two ends of the first connection line are respectively connected to the first positive electrode connection end and the second positive electrode connection end, and two ends of the second connection line are respectively connected to the second positive electrode connection end and the second negative electrode connection end; The first positive connection terminal is used to connect the positive electrode of the battery pack, and the second positive connection terminal is used to connect the positive electrode of the device to be charged and discharged; the first negative connection terminal is used to connect the negative electrode of the battery pack, and the second negative connection terminal is used to connect the negative electrode of the device to be charged and discharged; the switch module is arranged in the first connection line or the second connection line.

9. A method for protecting a battery pack, characterized in that: Applicable to a battery pack protection device, the protection device comprises: a control module, a measuring module and a plurality of connection circuits, wherein a switch module is provided in the connection circuit; The protection method comprises: During the charging and discharging process of the battery pack, determining whether an abnormal charging and discharging state occurs according to the operating parameters of the battery pack measured by the measuring module; If the abnormal charging and discharging state occurs, the control enters the abnormal processing flow to control at least one of the switch modules to be disconnected.

10. The protection method according to claim 9, characterized in that: The battery pack protection device also includes an alarm module and a receiving release module; The exception handling process also includes: Controlling the alarm module to send out an alarm signal, and controlling at least one of the switch modules to disconnect; Obtaining the instruction received by the receiving release module; If an alarm cancellation instruction is received, the control enters an alarm cancellation process to cancel the alarm and close the switch module.

11. The protection method according to claim 9 or 10, characterized in that: The abnormal charge and discharge state includes an abnormal voltage state, an abnormal current state and an abnormal temperature state; the working parameters include the charge and discharge current in the charge and discharge circuit, the battery pack voltage and the terminal temperature of the first connection end of the protection device; During the charging and discharging process of the battery pack, determining whether an abnormal charging and discharging state occurs according to the operating parameters of the battery pack measured by the measuring module includes: determining whether the abnormal temperature state occurs according to the terminal temperature; Determining whether the current abnormal state exists according to the charge and discharge current; Determining whether the voltage abnormality state exists according to the battery pack voltage; If the abnormal charging and discharging state occurs, the control enters the abnormality handling process, including: If the temperature abnormality occurs, the control enters the temperature abnormality processing flow to disconnect each of the switch modules; If the abnormal current state occurs, control to enter the overcurrent abnormality processing flow to disconnect the switch module in the charge and discharge circuit where the abnormal current state occurs or disconnect each of the switch modules; If the voltage abnormality state occurs, the control enters the voltage abnormality processing flow to disconnect each of the switch modules.

12. The protection method according to claim 11, characterized in that: The temperature abnormality state includes battery pack under-temperature abnormality and battery pack over-temperature abnormality; the abnormality handling process includes temperature abnormality handling process and over-temperature abnormality handling process; The determining whether the abnormal temperature state exists according to the terminal temperature includes: determining an internal temperature of the battery pack according to the terminal temperature; When the internal temperature is less than a first temperature threshold, it is determined that a battery pack under-temperature anomaly occurs; when the temperature of the battery pack is greater than a second temperature threshold, it is determined that a battery pack over-temperature anomaly occurs; If the temperature abnormality occurs, control enters the temperature abnormality processing flow to disconnect each of the switch modules, including: if the battery pack under-temperature abnormality occurs, control enters the under-temperature abnormality processing flow; if the battery pack under-temperature abnormality occurs, control enters the over-temperature abnormality processing flow; The under-temperature abnormality processing process includes: The control alarm module sends out a first alarm signal, and controls the disconnection of each of the switch modules to perform under-temperature protection; Acquire the terminal temperature and acquire the instruction received by the receiving release module; If a de-alarm instruction is received, the control enters the de-alarm process to de-alarm and close the switch module; If no alarm release instruction is received, determining whether the under-temperature protection is released according to the terminal temperature; Under the condition that the under-temperature protection is released, the alarm module is controlled to release the alarm and the switch module is controlled to close; The over-temperature abnormality processing process includes: The control alarm module sends out a second alarm signal, and controls the disconnection of each of the switch modules to perform over-temperature protection; Acquire the terminal temperature and acquire the instruction received by the receiving release module; If a de-alarm instruction is received, the control enters the de-alarm process to de-alarm and close the switch module; If no alarm release instruction is received, determining whether the over-temperature protection is released according to the terminal temperature; Under the condition that the over-temperature protection is released, the alarm module is controlled to release the alarm and the switch module is controlled to close.

13. The protection method according to claim 11, characterized in that: The determining whether the abnormal current state exists according to the charge and discharge current includes: When the charge and discharge current is greater than the charge and discharge current threshold, determining that the current abnormal state occurs; The overcurrent abnormality processing process includes: The control alarm module sends a third alarm signal, controls the disconnection of the switch module in the charge-discharge circuit where the abnormal current state occurs, or disconnects each of the switch modules; Obtaining the instruction received by the receiving release module; If an alarm cancellation instruction is received, the control enters an alarm cancellation process to cancel the alarm and close the switch module.

14. The protection method according to claim 11, characterized in that: The voltage abnormality state includes battery pack undervoltage abnormality and battery pack overvoltage abnormality; the abnormality handling process includes undervoltage abnormality handling process and overvoltage abnormality handling process; The determining whether the voltage abnormality state exists according to the battery pack voltage includes: when the voltage of the battery pack is less than a first voltage threshold, determining that a battery pack undervoltage abnormality occurs; when the voltage of the battery pack is greater than a second voltage threshold, determining that a battery pack overvoltage abnormality occurs; If the voltage abnormality occurs, control enters the voltage abnormality processing flow to disconnect each of the switch modules, including: if the battery pack undervoltage abnormality occurs, control enters the undervoltage abnormality processing flow; if the battery pack undervoltage abnormality occurs, control enters the overvoltage abnormality processing flow; The undervoltage abnormality processing process includes: The control alarm module sends a fourth alarm signal, and controls the disconnection of each of the switch modules to perform undervoltage protection; Acquire the battery pack voltage and acquire the instruction received by the receiving release module; If a de-alarm instruction is received, the control enters the de-alarm process to de-alarm and close the switch module; If no alarm release instruction is received, determining whether the undervoltage protection is released according to the battery pack voltage; Under the condition that the undervoltage protection is released, the alarm module is controlled to release the alarm and the switch module is controlled to close; The overvoltage abnormality processing process includes: The control alarm module sends out a fifth alarm signal, and controls the disconnection of each of the switch modules to perform overvoltage protection; Acquire the battery pack voltage and acquire the instruction received by the receiving release module; If a de-alarm instruction is received, the control enters the de-alarm process to de-alarm and close the switch module; If no alarm release instruction is received, determining whether the overvoltage protection is released according to the battery pack voltage; Under the condition that the overvoltage protection is released, the alarm module is controlled to release the alarm and the switch module is controlled to close.

15. The protection method according to claim 14, characterized in that: The step of determining that a battery pack undervoltage abnormality occurs when the voltage of the battery pack is less than a first voltage threshold comprises: determining that a battery pack undervoltage abnormality occurs when the voltage of the battery pack is less than the first voltage threshold and the discharge current of at least one discharge circuit is greater than a first preset current threshold; The method of determining that a battery pack overvoltage abnormality occurs when the voltage of the battery pack is greater than a second voltage threshold comprises: determining that a battery pack overvoltage abnormality occurs when the voltage of the battery pack is greater than the second voltage threshold and the charging current of at least one charging circuit is greater than a second preset current threshold.

16. The protection method according to claim 10, characterized in that: The alarm release process includes: Controlling the alarm module to stop sending alarm signals, and controlling each of the switch modules to close; A countdown is performed, and after the countdown ends, the step of returning to the step of determining whether an abnormal charging and discharging state occurs according to the working parameters of the battery pack measured by the measuring module during the charging and discharging process of the battery pack.

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