Lithium battery protection method, power supply system and equipment, protection system and storage medium

Abstract

The invention relates to the technical field of lithium batteries, in particular to a lithium battery protection method, a power supply system and equipment, a protection system and a storage medium. The method is applied to a lithium battery power supply system. The lithium battery power supply system comprises a lithium battery assembly, a lithium battery protection circuit and a system main circuit. The lithium battery assembly comprises a temperature sensor; the lithium battery protection circuit comprises a charging switch tube and a discharging switch tube; the system main circuit comprises a main control chip, and the main control chip is connected with a temperature sensor, a charging switch tube and a discharging switch tube; the method comprises the steps that the current battery temperature and the current charging and discharging state of a lithium battery are acquired, and current protection parameters are acquired according to the current battery temperature and the current charging and discharging state; acquiring current state information of the lithium battery through a sampling circuit; judging whether the current state information is matched with the current protection parameter or not; and if not, selecting one of the charging switch tube and the discharging switch tube to be switched off according to the current charging and discharging state. The use safety of the lithium battery can be ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, in particular to a lithium battery protection method, a power supply system and equipment, a protection system and a storage medium. Background Art

[0002] In a lithium battery power supply system, a lithium battery protection circuit is usually provided to protect the power safety of the lithium battery. A lithium battery protection chip is provided in the lithium battery protection circuit. The lithium battery protection chip is used to turn on or off the charge / discharge path of the lithium battery according to the current charge / discharge situation.

[0003] Existing lithium battery protection circuits are usually designed with fixed protection parameters, including maximum charge protection current, discharge protection current, charge protection voltage, and discharge protection voltage. These parameters are fixed after they are set. However, these protection parameters of lithium batteries will change with temperature. For example, under high temperature conditions, the maximum charge voltage that lithium batteries can withstand will be slightly lower than the voltage under normal temperature conditions. This means that if these protection parameters cannot be adjusted according to temperature changes, it may not be possible to effectively protect the health and safety of the battery under all temperature conditions. Summary of the invention

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a lithium battery protection method, a power supply system and equipment, a protection system and a storage medium to solve the problem in the prior art that the health and safety of the battery cannot be effectively protected under all temperature conditions.

[0005] The present invention discloses a lithium battery protection method, which is applied to a lithium battery power supply system. The lithium battery power supply system comprises a lithium battery assembly, a lithium battery protection circuit and a system main circuit;

[0006] The lithium battery assembly includes a lithium battery and a temperature sensor arranged on the surface of the lithium battery;

[0007] The lithium battery protection circuit comprises a lithium battery protection chip and a charging switch tube and a discharging switch tube connected to the lithium battery protection chip, wherein the discharging switch tube is connected to the lithium battery, and the charging switch tube is connected to the lithium battery through the discharging switch tube;

[0008] The system main circuit includes a main control chip, and a sampling circuit and a power management module connected to the main control chip, the main control chip is connected to the temperature sensor, the charging switch tube and the discharging switch tube, the power management module is connected to the charging switch tube, and the sampling circuit is connected to the charging switch tube;

[0009] The lithium battery protection method comprises the following steps:

[0010] Acquire the current battery temperature and the current charge and discharge state of the lithium battery, and acquire the current protection parameter according to the current battery temperature and the current charge and discharge state;

[0011] Collecting current status information of the lithium battery through the sampling circuit, wherein the current status information includes current voltage information and / or current current information;

[0012] Determine whether the current state information matches the current protection parameter; if not, select one of the charging switch tube and the discharging switch tube to be turned off according to the current charging and discharging state.

[0013] Optionally, the step of determining whether the current state information matches the current protection parameter includes:

[0014] Driving the power management module to limit at least one of the operating current, the operating voltage and the operating power of the lithium battery according to the current protection parameter;

[0015] Among them, the current protection parameter is at least one of a charging current threshold, a charging voltage threshold, a discharging power threshold, and a discharging current threshold.

[0016] Optionally, the step of limiting at least one of the operating current, the operating voltage and the operating power of the lithium battery according to the current protection parameter and the current charge and discharge state includes:

[0017] When the current charge and discharge state is the discharge state, the power management module is driven to control the working power to be lower than the discharge power threshold; if not, the power management module is driven to cut off the discharge current.

[0018] Optionally, the step of limiting at least one of the operating current, the operating voltage and the operating power of the lithium battery according to the current protection parameter and the current charge and discharge state includes:

[0019] When the current charge-discharge state is the charging state, driving the power management module to control the operating voltage to be lower than the charging voltage threshold, and controlling the operating current to be lower than the charging current threshold;

[0020] It is determined whether the current operating current of the lithium battery is lower than the charging current threshold and whether the current operating voltage is lower than the charging voltage threshold; if not, the power management module is driven to cut off the charging current.

[0021] Optionally, the step of judging whether the current state information matches the current protection parameter, and if not, selecting one of the charging switch tube and the discharging switch tube to be turned off according to the current charging and discharging state includes:

[0022] When the current charge and discharge state is the discharge state, determine whether the current current information exceeds the discharge current threshold value, and if so, drive the lithium battery protection circuit to the discharge protection state and turn off the discharge switch tube;

[0023] When the current charge and discharge state is the charging state, determine whether the current current information exceeds the charging current threshold, or whether the current voltage information exceeds the charging voltage threshold. If so, drive the lithium battery protection circuit to the charging protection state and turn off the charging switch tube.

[0024] Optionally, the step of obtaining the current battery temperature and current charge and discharge state of the lithium battery includes:

[0025] Acquiring charging and discharging parameters of the lithium battery through the sampling circuit, wherein the charging and discharging parameters include at least one of a charging current, a discharging current and a battery voltage;

[0026] It is determined whether the lithium battery is in a charging state or a discharging state according to the charging and discharging parameters.

[0027] The present invention also discloses a lithium battery power supply system for implementing the lithium battery protection method as described above, comprising: a lithium battery assembly, a lithium battery protection circuit and a system main circuit;

[0028] The lithium battery assembly includes a lithium battery and a temperature sensor arranged on the surface of the lithium battery;

[0029] The lithium battery protection circuit comprises a lithium battery protection chip and a charging switch tube and a discharging switch tube connected to the lithium battery protection chip, wherein the discharging switch tube is connected to the lithium battery, and the charging switch tube is connected to the lithium battery through the discharging switch tube;

[0030] The system main circuit includes a main control chip, and a sampling circuit and a power management module connected to the main control chip. The main control chip is connected to the temperature sensor, the charging switch tube and the discharging switch tube. The power management module is connected to the sampling circuit, and the sampling circuit is connected to the charging switch tube.

[0031] The present invention also discloses a lithium battery protection system, which is applied to the lithium battery power supply system as described above, and comprises:

[0032] An acquisition module, used to acquire the current battery temperature and the current charge and discharge state of the lithium battery, and acquire the current protection parameter according to the current battery temperature and the current charge and discharge state;

[0033] A collection module, used for collecting current status information of the lithium battery through the sampling circuit, wherein the current status information includes current voltage information and / or current current information;

[0034] The shutdown module is used to determine whether the current state information matches the current protection parameter; if not, select one of the charging switch tube and the discharging switch tube to be shut down according to the current charging and discharging state.

[0035] The present invention also discloses a power supply device, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the above method.

[0036] The present invention also discloses a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the processor executes the steps of the method described above.

[0037] Compared with the prior art, the lithium battery protection method provided by the embodiment of the present invention has the beneficial effect of obtaining the current protection parameters according to the current battery temperature and the current charging and discharging state, and then collecting the current state information of the lithium battery. When the current state information does not match the current protection parameters, one of the charging switch tube and the discharging switch tube is selected to be turned off according to the current charging and discharging state, so that the charging and discharging current / voltage can be stopped in time when the charging and discharging current / voltage is too high. Compared with the lithium battery protection circuit which can only monitor the current / voltage according to a fixed safety threshold, it can flexibly monitor and manage according to the matching current protection parameters under various temperature conditions, thereby effectively ensuring the safety of the lithium battery power supply system under different temperature conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The scheme of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, in which:

[0039] Figure 1 is a schematic flow chart of a first embodiment of a lithium battery protection method provided by the present invention;

[0040] Figure 2 It is a structural schematic diagram of an embodiment of a lithium battery power supply system provided by the present invention;

[0041] Figure 3 is a flow chart of a second embodiment of the lithium battery protection method provided by the present invention;

[0042] Figure 4 is a schematic flow chart of a third embodiment of a lithium battery protection method provided by the present invention;

[0043] Figure 5 It is a structural schematic diagram of an embodiment of a lithium battery protection system provided by the present invention.

[0044] The reference numerals in the figures are:

[0045] 10. Lithium battery power supply system; 11. Lithium battery assembly; 111. Lithium battery; 112. Temperature sensor; 12. Lithium battery protection circuit; 121. Lithium battery protection chip; 122. Charging switch tube; 123. Discharging switch tube; 13. System main circuit; 131. Main control chip; 132. Sampling circuit; 133. Power management module; 20. Lithium battery protection system; 21. Acquisition module; 22. Collection module; 23. Shutdown module. DETAILED DESCRIPTION

[0046] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Now, in conjunction with the accompanying drawings, the preferred embodiments of the present invention are described in detail.

[0047] Please refer to Figure 1 and Figure 2 , Figure 1 is a flow chart of a first embodiment of a lithium battery protection method provided by the present invention, Figure 2 FIG. 1 is a schematic diagram of the structure of an embodiment of the lithium battery power supply system provided by the present invention. Figure 2 As shown in FIG. 1 , the lithium battery power supply system 10 includes a lithium battery assembly 11 , a lithium battery protection circuit 12 and a system main circuit 13 .

[0048] The lithium battery assembly 11 includes a lithium battery 111 and a temperature sensor 112. The lithium battery 111 can be a single-cell lithium battery or a multi-cell lithium battery, and can be configured according to actual usage requirements. The temperature sensor 12 is configured on the surface of the lithium battery 111, so that the temperature of the lithium battery 111 can be obtained in real time.

[0049] The lithium battery protection circuit 12 includes a lithium battery protection chip 121, a charging switch tube 122 and a discharging switch tube 123. The charging switch tube 122 and the discharging switch tube 123 are both MOS tubes, specifically N-type MOS tubes. The D pole of the charging switch tube 122 is connected to the D pole of the discharging switch tube 123, and the G pole of the charging switch tube 122 and the G pole of the discharging switch tube 123 are connected to the lithium battery protection chip 121, so that the lithium battery protection chip 121 can control the on and off of the charging switch tube 122 and the discharging switch tube 123. It can be understood that when the charging switch tube 122 is in the on state, the lithium battery 111 can receive the power provided by the system main circuit 13 through the lithium battery protection circuit 12 for charging. When the charging switch tube 122 is in the off state, the power provided by the system main circuit 13 will not be transmitted to the lithium battery 111 through the lithium battery protection circuit 12. When the discharge switch tube 123 is in the on state, the lithium battery 111 can provide power to the system main circuit 13 through the lithium battery protection circuit 12. When the discharge switch tube 123 is in the off state, the lithium battery 11 will not be able to provide power to the system main circuit 13 through the lithium battery protection circuit 12.

[0050] The system main circuit 13 includes a main control chip 131, a sampling circuit 132 and a power management module 133, and the sampling circuit 132 and the power management module 133 are both connected to the main control chip 131. The main control chip 131 is connected to the temperature sensor 112, so that the temperature of the lithium battery 111 can be obtained in real time through the temperature sensor 112. The main control chip 131 is also connected to the charging switch tube 122 and the discharging switch tube 123, so that the main control chip 131 can control the shutdown and conduction of the charging switch tube 122 and the discharging switch tube 123, that is, it can control whether the lithium battery 11 can be charged and discharged. The sampling circuit 132 is connected to the charging switch tube 122. Since the charging switch tube 122 is connected to the discharging switch tube 123, the sampling circuit 132 can obtain the actual information of the current and voltage input / output of the lithium battery 111 through the lithium battery protection circuit 12. The power management module 133 can control the size of the charging and discharging current and can shut down the charging and discharging current. The sampling circuit 132 can be set separately or in the power management module 133.

[0051] The specific working process of the main control chip 131 is as follows:

[0052] The lithium battery protection method provided by the present invention comprises the following steps:

[0053] S101: Acquire the current battery temperature and current charge and discharge state of the lithium battery, and acquire current protection parameters according to the current battery temperature and current charge and discharge state.

[0054] In a specific implementation scenario, the main control chip obtains the current temperature of the lithium battery through the temperature sensor, and obtains the current charging current and discharging current of the lithium battery through the sampling circuit. The power management module can obtain the current charging and discharging status of the lithium battery. The current protection parameters are obtained according to the current battery temperature and the current charging and discharging status. The type of the corresponding current protection parameter is different for different charging and discharging states. Specifically, the type of the current protection parameter in the charging state is at least one of the charging current threshold and the charging voltage threshold, while in the discharging state, the type of the current protection parameter is at least one of the discharge power threshold and the discharge current threshold.

[0055] The maximum charge rate and maximum discharge rate allowed for lithium batteries at different temperatures are different, and the full charge voltage allowed for lithium batteries at different temperatures is also different. Therefore, the specific value of the current protection parameter can be obtained according to the current temperature.

[0056] S102: collecting current status information of the lithium battery through a sampling circuit, where the current status information includes current voltage information and / or current current information.

[0057] In a specific implementation scenario, the charging / discharging of the lithium battery needs to pass through the lithium battery protection circuit. Therefore, the sampling circuit connected to the input / output port of the lithium battery protection circuit can obtain the current status information of the lithium battery, which includes the current voltage information and / or the current current information.

[0058] S103: Determine whether the current state information matches the current protection parameters; if not, execute step S104.

[0059] In a specific implementation scenario, it is determined whether the current voltage information and / or the current current information matches the current protection parameter. For example, the current state is charging, and the current protection parameter is the charging current threshold and / or the charging voltage threshold. It is determined whether the current voltage information does not exceed the charging voltage threshold, and whether the current current information does not exceed the charging current threshold. If the current voltage information does not exceed the charging voltage threshold and the current current information does not exceed the charging current threshold, it can be determined that the current state information matches the current protection parameter. If the current voltage information exceeds the charging voltage threshold and / or the current current information exceeds the charging current threshold, it can be determined that the current state information does not match the current protection parameter.

[0060] The current state is discharging, and the current protection parameter is the discharge power threshold and / or the discharge current threshold. It is determined whether the current current information exceeds the discharge current threshold. If the current current information does not exceed the discharge current threshold, it can be determined that the current state information and the current protection parameter match. If the current current information exceeds the discharge current threshold, it can be determined that the current state information and the current protection parameter do not match.

[0061] S104: Select one of the charging switch tube and the discharging switch tube to be turned off according to the current charging and discharging state.

[0062] In a specific implementation scenario, if the current state information and the current protection parameters do not match, one of the charging switch tube and the discharging switch tube is selected to be turned off according to the current charging and discharging state, so that the lithium battery stops charging or discharging operations to ensure the safe operation of the lithium battery power supply system.

[0063] If it is currently in the charging state, the main control chip selects the charging switch tube to turn off, thereby ensuring the safe operation of the lithium battery power supply system. The charging switch tube is a MOS tube, which has a parasitic diode itself. This diode is generated due to the internal structure of the MOS tube. When the charging switch MOS tube is in the off state, this parasitic diode still exists and will work. When the lithium battery protection circuit is controlled to enter the charging protection state, the charging switch MOS tube is in the off state, but the parasitic diode still exists. In this case, if an external discharge load is connected to the battery, even if the charging switch MOS tube is turned off, the discharge current of the lithium battery can flow unidirectionally through this parasitic diode. In this way, the discharge function of the lithium battery is almost unaffected by the closure of the charging switch MOS tube, and the current can continue to flow, thereby realizing the discharge function.

[0064] However, due to the unidirectional nature of the parasitic diode, current is only allowed to flow in one direction. Even if the outside world continues to input current through the main control circuit, these currents will not be transmitted to the lithium battery. Therefore, the lithium battery will no longer be charged, avoiding the occurrence of dangerous charging phenomena such as overcurrent and overvoltage charging.

[0065] If it is currently in the discharge state, the main control chip selects the discharge switch tube for discharge, thereby ensuring the safe operation of the lithium battery power supply system. The discharge switch tube is also a MOS tube, and it also has a parasitic diode, which is generated due to the internal structure of the MOS tube. When the discharge switch MOS tube is in the off state, this parasitic diode still exists and will work. When the lithium battery protection circuit is controlled to enter the discharge protection state, the discharge switch MOS tube is in the off state, but the parasitic diode still exists. In this case, if an external charging power supply is connected to the battery, even if the discharge switch MOS tube is turned off, the charging current of the lithium battery can flow unidirectionally through this parasitic diode. In this way, the charging function of the lithium battery is almost unaffected by the closure of the charging switch MOS tube, and the current can continue to flow, thereby realizing the charging function.

[0066] However, due to the unidirectionality of the parasitic diode, current is only allowed to flow in one direction. Even if the external discharge load continues to exist, the current of the lithium battery cannot flow out. Therefore, the lithium battery will no longer discharge, avoiding the occurrence of dangerous charging phenomena such as overcurrent discharge.

[0067] From the above description, it can be seen that in this embodiment, the current protection parameters are obtained according to the current battery temperature and the current charge and discharge status, and then the current status information of the lithium battery is collected. When the current status information does not match the current protection parameters, one of the charging switch tube and the discharging switch tube is selected to be turned off according to the current charge and discharge status, so that the charging and discharging current / voltage can be stopped in time when the charging and discharging current / voltage is too high. Compared with the lithium battery protection circuit that can only monitor the current / voltage according to a fixed safety threshold, it can flexibly monitor and manage according to the matching current protection parameters under various temperature conditions, thereby effectively ensuring the safety of the lithium battery power supply system under different temperature conditions.

[0068] Please refer to Figure 3 , Figure 3 It is a flow chart of the second embodiment of the lithium battery protection method provided by the present invention.

[0069] S201: Acquire the current battery temperature and current charge and discharge state of the lithium battery, and acquire current protection parameters according to the current battery temperature and current charge and discharge state.

[0070] In a specific implementation scenario, step S201 is substantially the same as step S101 in the first embodiment of the lithium battery protection method provided by the present invention, and will not be described in detail herein.

[0071] S202: The driving power management module limits at least one of the operating current, the operating voltage and the operating power of the lithium battery according to the current protection parameter.

[0072] In a specific implementation scenario, the power management module can adjust the working current during charging and discharging of the lithium battery as well as the on and off of the working current. It can also control the working voltage so that the working current, working voltage and working power during charging and discharging of the lithium battery can match the current protection parameter limits to ensure the safe use of the lithium battery power supply system.

[0073] Although the power management module is usually designed with multiple protection mechanisms to ensure the safe operation of the lithium battery power supply system, in actual situations, the control failure of the power management module may still occur. When the control of the power management module fails, the working current, working voltage and working power of the lithium battery during charging and discharging may exceed the current protection parameter limit. Therefore, after the power management module limits at least one of the working current, working voltage and working power of the lithium battery, the current state information of the lithium battery is collected through the sampling circuit, and the current state information includes current voltage information and / or current current information.

[0074] For example, when the current charging and discharging state is the discharge state, the main control chip sets the power management module output current limiting to limit the size of the working current, or rebroadcasts the low-power charging protocol to reduce the working power, so that the working current of the lithium battery is lower than the discharge current threshold and the working power is lower than the discharge working threshold.

[0075] After the power management module takes control, it detects whether the current working current of the lithium battery is lower than the discharge current threshold to detect whether the power management module's control over the working power is effective. If the current working current exceeds the discharge current threshold, it proves that the control effect of the power management module is poor or the control is unsuccessful. The power management module is driven to cut off the discharge current to stop discharging when the discharge current exceeds the discharge current threshold to protect the lithium battery.

[0076] For another example, when the current charge and discharge state is the charging state, the main control chip will drive the power management module to control the operating voltage to be lower than the charging voltage threshold, and control the operating current to be lower than the charging current threshold.

[0077] After the power management module takes control, it detects whether the current working current of the lithium battery is lower than the charging current threshold and whether the current working voltage is lower than the charging voltage threshold, so as to detect whether the power management module's control over the working power is effective. If the current working current exceeds the charging current threshold and the working voltage exceeds the charging voltage threshold, it proves that the control effect of the power management module is poor or the control is unsuccessful. The power management module is driven to cut off the input current to stop discharging when the charging current exceeds the charging current threshold to protect the lithium battery.

[0078] Although the power management module is usually designed with multiple protection mechanisms to ensure the safe operation of the lithium battery power supply system, in actual situations, the control of the power management module may still fail. When the control of the power management module fails, the working current, working voltage and working power of the lithium battery during charging and discharging may exceed the current protection parameter limits. Therefore, after the power management module limits at least one of the working current, working voltage and working power of the lithium battery, the current status information of the lithium battery is collected through the sampling circuit. The current status information includes current voltage information and / or current current information. Based on the current status information, it is determined whether the main control chip needs to control the charging switch tube and the discharging switch tube.

[0079] In other implementation scenarios, if the current status information matches the current protection parameters, it proves that the control of the power management module is successful and in place, and the main control chip does not need to select one of the charging switch tube and the discharging switch tube to shut down according to the current charging and discharging status.

[0080] S203: Collecting current status information of the lithium battery through a sampling circuit, where the current status information includes current voltage information and / or current current information.

[0081] S204: Determine whether the current state information matches the current protection parameters; if not, execute step S205.

[0082] S205: Select one of the charging switch tube and the discharging switch tube to be turned off according to the current charging and discharging state.

[0083] In a specific implementation scenario, steps S203-S205 are substantially the same as steps S102-S104 in the first embodiment of the lithium battery protection method provided by the present invention, and are not described in detail herein.

[0084] In this embodiment, the driving power management module shuts off the charging / discharging current. If the shutdown fails, the main control chip shuts off the charging switch tube / discharging switch tube. In this way, if the power management module can operate successfully, it will be easier to turn on the charging / discharging current, which can be achieved directly by the power management module. If the main control chip shuts off the charging switch tube / discharging switch tube, it is necessary to restart the lithium battery power supply system, and the operation is more complicated.

[0085] From the above description, it can be seen that in this embodiment, after obtaining the current protection parameters, the power management module is first driven to limit at least one of the operating current, operating voltage and operating power of the lithium battery to ensure the charging and discharging safety of the lithium battery. When the limitation of the power management module fails, the power management module is driven to turn off the charging switch tube / discharging switch tube. If the shutdown fails, the main control chip turns off the charging switch tube / discharging switch tube. The power management module is operated first, which can reduce the control cost of the lithium battery power supply system, and the operation of the power management module is more flexible and easy to implement.

[0086] Please refer to Figure 4 , Figure 4 1 is a flow chart of a third embodiment of a lithium battery protection method provided by the present invention. The lithium battery protection method provided by the present invention comprises the following steps:

[0087] S301: Obtain the current battery temperature of the lithium battery.

[0088] S302: Determine whether the current charge-discharge state is a charging state. If yes, execute step S303; if no, execute step S309.

[0089] S303: Acquire a charging current threshold and a charging voltage threshold according to the current battery temperature.

[0090] S304: driving the power management module to control the operating voltage to be lower than the charging voltage threshold, and to control the operating current to be lower than the charging current threshold.

[0091] S305: Determine whether the current working current of the lithium battery is lower than the charging current threshold and whether the current working voltage is lower than the charging voltage threshold. If not, execute step S306.

[0092] S306: Drive the power management module to shut off the charging current.

[0093] S307: Determine whether the current current information exceeds the charging current threshold, and whether the current voltage information exceeds the charging voltage threshold. If so, execute step S308.

[0094] S308: driving the lithium battery protection circuit to be in a charging protection state and turning off the charging switch tube.

[0095] S309: Obtaining a discharge power threshold and a discharge current threshold according to the current battery temperature.

[0096] S310: driving the power management module to control the operating power to be lower than the discharge power threshold.

[0097] S311: Determine whether the current operating current of the lithium battery is lower than the discharge current threshold. If not, execute step S312.

[0098] S312: driving the power management module to shut down the discharge current.

[0099] S313: Determine whether the current current information exceeds the current discharge current threshold, if so, execute step S314.

[0100] S314: driving the lithium battery protection circuit to be in a discharge protection state and turning off the discharge switch tube.

[0101] In a specific implementation scenario, steps S301-S314 are substantially consistent with the contents described above in the present invention and will not be described in detail here.

[0102] In this embodiment, when the lithium battery is in the charging state, the driving power management module controls the operating voltage to be lower than the charging voltage threshold, and controls the operating current to be lower than the charging current threshold. If the power management module controls successfully, the power management module continues to monitor the charging current and charging voltage to ensure the safe operation of the lithium battery power supply system.

[0103] If the power management module fails to control, the power management module will turn off the charging current, and after the preset conditions are met, the power management module will turn on the charging current to continue charging the lithium battery. The preset conditions can be a preset time interval or other conditions.

[0104] When the lithium battery is in the discharge state, the driving power management module controls the working power to be lower than the discharge power threshold. If the power management module is successfully controlled, the lithium battery protection chip continues to monitor the discharge current and discharge voltage to ensure the safe operation of the lithium battery power supply system.

[0105] If the power management module fails to control, the power management module will turn off the discharge current, and after the preset conditions are met, the power management module will turn on the discharge current to continue discharging the lithium battery. The preset conditions can be a preset time interval or other conditions.

[0106] Please refer to Figure 5 , Figure 5 The lithium battery protection system 20 includes an acquisition module 21 , a collection module 22 , and a shutdown module 23 .

[0107] The acquisition module 21 is used to obtain the current battery temperature and current charge and discharge status of the lithium battery, and obtain the current protection parameters according to the current battery temperature and the current charge and discharge status; the acquisition module 22 is used to collect the current status information of the lithium battery through the sampling circuit, and the current status information includes the current voltage information and / or the current current information; the shutdown module 23 is used to determine whether the current status information matches the current protection parameters; if not, select a shutdown from the charging switch tube and the discharging switch tube according to the current charge and discharge status.

[0108] The shutdown module 23 is also used to drive the power management module to limit at least one of the operating current, operating voltage and operating power of the lithium battery according to the current protection parameters; wherein the current protection parameters are at least one of the charging current threshold, the charging voltage threshold, the discharge power threshold and the discharge current threshold.

[0109] The shutoff module 23 is also used to drive the power management module to control the working power to be lower than the discharge power threshold when the current charge and discharge state is the discharge state. If not, the power management module is driven to shut off the discharge current.

[0110] The shutdown module 23 is also used to drive the power management module to control the operating voltage to be lower than the charging voltage threshold, and to control the operating current to be lower than the charging current threshold when the current charging and discharging state is the charging state; it determines whether the current operating current of the lithium battery is lower than the charging current threshold and whether the current operating voltage is lower than the charging voltage threshold. If not, the power management module is driven to shut down the charging current.

[0111] The shutdown module 23 is also used to determine whether the current current information exceeds the discharge current threshold when the current charge and discharge state is the discharge state. If so, the lithium battery protection circuit is driven to be in the discharge protection state and the discharge switch tube is turned off; when the current charge and discharge state is the charging state, it is determined whether the current current information exceeds the charging current threshold and whether the current voltage information exceeds the charging voltage threshold. If so, the lithium battery protection circuit is driven to be in the charging protection state and the charging switch tube is turned off.

[0112] The acquisition module 21 is also used to acquire the charging and discharging parameters of the lithium battery through a sampling circuit, the charging and discharging parameters including at least one of the charging current, the discharging current and the battery voltage; and determine whether the lithium battery is in a charging state or a discharging state according to the charging and discharging parameters.

[0113] From the above description, it can be seen that in this embodiment, the current protection parameters are obtained according to the current battery temperature and the current charge and discharge status, and then the current status information of the lithium battery is collected. When the current status information does not match the current protection parameters, one of the charging switch tube and the discharging switch tube is selected to be turned off according to the current charge and discharge status, so that the charging and discharging current / voltage can be stopped in time when the charging and discharging current / voltage is too high. Compared with the lithium battery protection circuit that can only monitor the current / voltage according to a fixed safety threshold, it can flexibly monitor and manage according to the matching current protection parameters under various temperature conditions, thereby effectively ensuring the safety of the lithium battery power supply system under different temperature conditions.

[0114] The present invention also provides a power supply device. The power supply device includes a processor and a memory. The processor is coupled to the memory. A computer program is stored in the memory, and the processor executes the computer program when working to implement the above method. The detailed steps can be found above and will not be repeated here.

[0115] The present invention also provides a computer-readable storage medium. The computer-readable storage medium stores at least one computer program, which is used to be executed by a processor to implement the above method. The detailed steps can be referred to above and will not be repeated here. In one embodiment, the computer-readable storage medium can be a storage chip, a hard disk, or a mobile hard disk or a USB flash drive, an optical disk, or other readable and writable storage tools in a terminal, or a server, etc.

[0116] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0117] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0118] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. For those skilled in the art, the technical solutions described in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents; and all these modifications and replacements should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A lithium battery protection method, characterized in that: Applicable to a lithium battery power supply system, the lithium battery power supply system comprising a lithium battery assembly, a lithium battery protection circuit and a system main circuit; The lithium battery assembly includes a lithium battery and a temperature sensor arranged on the surface of the lithium battery; The lithium battery protection circuit comprises a lithium battery protection chip and a charging switch tube and a discharging switch tube connected to the lithium battery protection chip, wherein the discharging switch tube is connected to the lithium battery, and the charging switch tube is connected to the lithium battery through the discharging switch tube; The system main circuit includes a main control chip, and a sampling circuit and a power management module connected to the main control chip, the main control chip is connected to the temperature sensor, the charging switch tube and the discharging switch tube, the power management module is connected to the sampling circuit, and the sampling circuit is connected to the charging switch tube; The lithium battery protection method comprises the following steps: Acquire the current battery temperature and the current charge and discharge state of the lithium battery, and acquire the current protection parameter according to the current battery temperature and the current charge and discharge state; Collecting current status information of the lithium battery through the sampling circuit, wherein the current status information includes current voltage information and / or current current information; Determining whether the current state information matches the current protection parameter; If not, one of the charging switch tube and the discharging switch tube is selected to be turned off according to the current charging and discharging state.

2. The lithium battery protection method according to claim 1, characterized in that: The step of determining whether the current state information matches the current protection parameter comprises: Driving the power management module to limit at least one of the operating current, the operating voltage and the operating power of the lithium battery according to the current protection parameter; Among them, the current protection parameter is at least one of a charging current threshold, a charging voltage threshold, a discharging power threshold, and a discharging current threshold.

3. The lithium battery protection method according to claim 2, characterized in that: The step of limiting at least one of the operating current, the operating voltage and the operating power of the lithium battery according to the current protection parameter and the current charge and discharge state comprises: When the current charge and discharge state is the discharge state, the power management module is driven to control the working power to be lower than the discharge power threshold; if not, the power management module is driven to cut off the discharge current.

4. The lithium battery protection method according to claim 2, characterized in that: The step of limiting at least one of the operating current, the operating voltage and the operating power of the lithium battery according to the current protection parameter and the current charge and discharge state comprises: When the current charge-discharge state is the charging state, driving the power management module to control the operating voltage to be lower than the charging voltage threshold, and controlling the operating current to be lower than the charging current threshold; It is determined whether the current operating current of the lithium battery is lower than the charging current threshold and whether the current operating voltage is lower than the charging voltage threshold; if not, the power management module is driven to cut off the charging current.

5. The lithium battery protection method according to any one of claims 2 to 4, characterized in that: The step of judging whether the current state information matches the current protection parameter, and if not, selecting one of the charging switch tube and the discharging switch tube to be turned off according to the current charging and discharging state, comprises: When the current charge and discharge state is the discharge state, determine whether the current current information exceeds the discharge current threshold value, and if so, drive the lithium battery protection circuit to the discharge protection state and turn off the discharge switch tube; When the current charge and discharge state is the charging state, determine whether the current current information exceeds the charging current threshold, or whether the current voltage information exceeds the charging voltage threshold. If so, drive the lithium battery protection circuit to the charging protection state and turn off the charging switch tube.

6. The lithium battery protection method according to claim 1, characterized in that: The step of obtaining the current battery temperature and current charge and discharge state of the lithium battery includes: Acquiring charging and discharging parameters of the lithium battery through the sampling circuit, wherein the charging and discharging parameters include at least one of a charging current, a discharging current and a battery voltage; It is determined whether the lithium battery is in a charging state or a discharging state according to the charging and discharging parameters.

7. A lithium battery power supply system, characterized in that: A lithium battery protection method for implementing any one of claims 1 to 6, comprising: a lithium battery assembly, a lithium battery protection circuit and a system main circuit; The lithium battery assembly includes a lithium battery and a temperature sensor arranged on the surface of the lithium battery; The lithium battery protection circuit comprises a lithium battery protection chip and a charging switch tube and a discharging switch tube connected to the lithium battery protection chip, wherein the discharging switch tube is connected to the lithium battery, and the charging switch tube is connected to the lithium battery through the discharging switch tube; The system main circuit includes a main control chip, and a sampling circuit and a power management module connected to the main control chip. The main control chip is connected to the temperature sensor, the charging switch tube and the discharging switch tube. The power management module is connected to the sampling circuit, and the sampling circuit is connected to the charging switch tube.

8. A lithium battery protection system, characterized in that: The lithium battery power supply system according to claim 7 comprises: An acquisition module, used to acquire the current battery temperature and the current charge and discharge state of the lithium battery, and acquire the current protection parameter according to the current battery temperature and the current charge and discharge state; A collection module, used for collecting current status information of the lithium battery through the sampling circuit, wherein the current status information includes current voltage information and / or current current information; The shutdown module is used to determine whether the current state information matches the current protection parameter; if not, select one of the charging switch tube and the discharging switch tube to be shut down according to the current charging and discharging state.

9. A power supply device, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the method according to any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that: A computer program is stored, and when the computer program is executed by a processor, the processor is caused to execute the steps of the method according to any one of claims 1 to 6.

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