Charging and discharging control method and device for battery pack

Abstract

The invention provides a charging and discharging control method and device for a battery pack, and belongs to the technical field of medical instruments. According to the method, detection temperatures, collected by a temperature control module, of a plurality of battery packs can be obtained; and based on each detection temperature, determining whether each battery pack satisfies a preset charging and discharging condition so as to generate a charging allowing signal or a discharging allowing signal or a temperature adjusting signal. Under the condition that the charging permission signal is generated, the charging permission signal is sent to the charging management unit, so that connection between an external power supply and each battery pack is conducted, and charging current is provided for each battery pack; under the condition that the discharge allowing signal is generated, the discharge allowing signal is sent to a discharge management unit so as to conduct connection between each battery pack and the access load, so that each battery pack supplies power to the access load; and under the condition that the temperature adjusting signal is generated, the temperature adjusting signal is sent to the temperature control module so as to heat or dissipate heat of each battery pack, so that the battery packs meet preset charging and discharging conditions.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a charge and discharge control method and device for a battery pack. Background Art

[0002] With the widespread use of portable electronic devices, electronic devices have become an indispensable tool for people's daily lives. Whether it is business travel, leisure travel or daily life, they are highly dependent on portable devices such as smartphones, tablets, and laptops. However, the battery life of these devices is often limited by the battery capacity. Especially during long-distance travel or outdoor activities, battery exhaustion has become a common problem that plagues users. For this reason, large-capacity battery packs are widely used in various scenarios as an effective battery life solution.

[0003] However, in certain public places, such as airports and high-speed rail stations, the carrying of large-capacity battery packs is strictly restricted due to safety considerations. These places usually set an upper limit on the capacity of battery packs that can be carried, and battery packs that exceed the specified capacity cannot pass security checks. This not only brings inconvenience to passengers who need to use electronic devices for a long time, but also limits their flexible use of devices during travel. Especially in international travel, different countries and regions may have different regulations on the carrying of battery packs, further increasing the complexity and uncertainty of travel.

[0004] In addition, under special climatic conditions such as cold weather, the performance of the battery pack will be further seriously affected. For example, in a low temperature environment, the chemical reaction rate inside the battery slows down, causing the battery power to drop rapidly, or even unable to charge and discharge normally. This is undoubtedly a huge challenge for electronic devices that rely on battery power. Especially in extreme environments such as outdoor adventures and polar scientific research, the performance stability of the battery pack is directly related to the successful completion of the mission and the safety of personnel.

[0005] Based on this, there is an urgent need for a technical solution for controlling the charging and discharging of a battery pack that is both portable and adaptable to various working environment conditions. Summary of the invention

[0006] The embodiments of the present application provide a charge and discharge control method and device for a battery pack, which are used to solve the technical problems that current battery packs are inconvenient to carry and have limited performance under cold conditions, thereby affecting the battery life and flexibility of use of electronic devices and resulting in a poor user experience.

[0007] On the one hand, an embodiment of the present application provides a charge and discharge control method for a battery pack, the method comprising:

[0008] Acquire the detected temperatures of multiple battery packs collected by a preset temperature control module;

[0009] Based on each of the detected temperatures, determining whether each of the battery packs meets a preset charge and discharge condition, so as to generate a charge permission signal or a discharge permission signal or a temperature adjustment signal;

[0010] Wherein, when the charging permission signal is generated, the charging permission signal is sent to the charging management unit to connect the external power supply to each of the battery packs to provide a charging current to each of the battery packs;

[0011] When the discharge permission signal is generated, the discharge permission signal is sent to a discharge management unit to conduct the connection between each battery pack and the connected load, so that each battery pack supplies power to the connected load;

[0012] When the temperature adjustment signal is generated, the temperature adjustment signal is sent to the temperature control module to heat or dissipate heat for each battery pack so that the battery pack meets the preset charge and discharge conditions.

[0013] In one implementation of the present application, the power supply mode of the temperature control module includes at least one of the following: power supply by an external power supply, power supply by a battery pack, or power supply by a wide temperature power supply unit;

[0014] Acquiring the detected temperatures of multiple battery packs collected by a preset temperature control module, specifically including:

[0015] Acquire the detected temperature of each battery pack from the temperature control module under a corresponding power supply mode; the corresponding power supply mode is obtained based on the connection state of the external power supply and the discharge activation state of the battery pack; the discharge activation state indicates whether the battery pack is in a state allowing discharge;

[0016] Wherein, when the connection state is connected, the corresponding power supply mode is power supply by the external power supply;

[0017] When the connection state is disconnected and the discharge activation state is activated, the corresponding power supply mode is powering the battery pack;

[0018] Otherwise, the corresponding power supply mode is power supply by a wide temperature power supply unit.

[0019] In one implementation of the present application, based on each of the detected temperatures, determining whether each of the battery packs meets a preset charge and discharge condition so as to generate a charge permission signal or a discharge permission signal or a temperature adjustment signal specifically includes:

[0020] Determining the connection status of the external power supply;

[0021] After determining that the connection state is connected, matching the detected temperature with a preset first temperature range;

[0022] When the matching result is that the detected temperature is within the first temperature range, determining that the corresponding battery pack meets the charging condition, so as to generate the charging permission signal;

[0023] When the matching result is that the detected temperature is not within the first temperature range, it is determined that the corresponding battery pack does not meet the charging condition, so as to generate the temperature adjustment signal to adjust the temperature of the battery pack until the detected temperature of the battery pack is within the first temperature range.

[0024] In one implementation of the present application, based on each of the detected temperatures, determining whether each of the battery packs meets a preset charge and discharge condition so as to generate a charge permission signal or a discharge permission signal or a temperature adjustment signal specifically includes:

[0025] Determining the connection status of the external power supply;

[0026] After determining that the connection state is disconnected, matching the detected temperature with a preset second temperature range;

[0027] When the matching result is that the detected temperature is within the second temperature range, determining that the corresponding battery pack meets the discharge condition, so as to generate the discharge permission signal;

[0028] When the matching result is that the detected temperature is not in the second temperature range, it is determined that the corresponding battery pack does not meet the discharge condition, so as to generate the temperature adjustment signal to adjust the temperature of the battery pack until the detected temperature of the battery pack is in the second temperature range.

[0029] In one implementation of the present application, the method further includes:

[0030] When it is determined that the connection state of the external power supply is connected, an external discharge signal is generated and sent to the discharge management unit to conduct the connection between the external power supply and the connected load so that the external power supply supplies power to the connected load.

[0031] In one implementation of the present application, after sending the charging permission signal to the charging management unit, the method further includes:

[0032] Obtaining the battery voltage of each of the battery packs and comparing the battery voltages;

[0033] Determining the charging priority of each battery pack according to the order of the battery voltage from small to large; wherein the battery voltage and the priority level of the charging priority are negatively correlated;

[0034] According to the charging priority, the charging management unit is controlled to turn on the connection between the external power supply and the first battery pack of the first charging priority level to provide a charging current to the first battery pack until the battery voltage of the first battery pack is equal to that of the second battery pack of the next charging priority level, and the charging management unit is controlled to simultaneously turn on the connection between the external power supply and the first battery pack and the second battery pack respectively to charge the battery packs synchronously until the battery packs simultaneously meet the charging termination condition; wherein the connection between the external power supply and each of the battery packs includes a BUCK circuit, and the one BUCK circuit has a one-to-many relationship with each of the battery packs.

[0035] In one implementation of the present application, after sending the discharge permission signal to the discharge management unit, the method further includes:

[0036] Obtaining the battery voltage of each of the battery packs and comparing the battery voltages;

[0037] Determining the discharge priority of each of the battery packs according to the order of the battery voltages from large to small; wherein the battery voltages are positively correlated with the priority levels of the discharge priorities;

[0038] According to the discharge priority, the discharge management unit is controlled to turn on the connection between the third battery pack of the first discharge priority level and the connected load to supply power to the connected load until the battery voltage of the third battery pack is equal to that of the fourth battery pack of the next discharge priority level, and the discharge management unit is controlled to simultaneously turn on the connection between the third battery pack, the fourth battery and the connected load respectively to enable the battery packs to discharge synchronously until the battery packs simultaneously meet the discharge termination conditions.

[0039] On the other hand, an embodiment of the present application further provides a charge and discharge control device for a battery pack, the device being used to connect a plurality of battery packs; the device comprising: a main control module, a charge management unit, a discharge management unit and a temperature control module respectively connected to the main control module;

[0040] The charging management unit is connected to the external power supply and each of the battery packs, respectively, and is used to conduct the external power supply and each of the battery packs based on the charging permission signal of the main control module, so as to provide a charging current to each of the battery packs;

[0041] The discharge management unit is connected to each of the battery packs and the connected load, respectively, and is used to conduct each of the battery packs and the connected load based on the discharge permission signal of the main control module, so that each of the battery packs supplies power to the connected load;

[0042] The temperature control module is connected to the discharge management unit and the external power supply, respectively, and is used to collect the detected temperature of each battery pack under the corresponding power supply mode and send it to the main control module, and heat or dissipate heat for each battery pack based on the temperature adjustment signal of the main control module to make it meet the preset charging and discharging conditions; wherein the corresponding power supply mode at least includes the external power supply or the discharge management unit supplying power to the temperature control module;

[0043] The main control module is used to execute a charge and discharge control method for a battery pack as described in any one of claims 1 to 7 above.

[0044] In one implementation of the present application, the device further includes: a wide temperature power supply unit;

[0045] The wide temperature power supply unit is used to supply power to the temperature control module in a corresponding power supply mode when the external power supply is disconnected and the discharge activation state is not activated; wherein the discharge activation state indicates whether the battery pack is in a state allowing discharge.

[0046] In one implementation of the present application, the device further includes: a voltage stabilizing unit;

[0047] The voltage stabilizing unit is respectively connected to the external power supply, the discharge management unit and the wide temperature power supply unit, and is used to supply power to the temperature control module in the corresponding power supply mode through three diodes corresponding to the external power supply, the discharge management unit and the wide temperature power supply unit respectively.

[0048] In one implementation of the present application, the plurality of battery packs include at least a first battery pack and a second battery pack; the charging management unit includes: a first PMOS tube switch circuit, a second PMOS tube switch circuit, and a third PMOS tube switch circuit;

[0049] The first PMOS switch circuit is respectively connected to the external power supply, the main control module, the second PMOS switch circuit and the third PMOS switch circuit, and the first PMOS switch circuit at least includes a first PMOS transistor, which is used to conduct the connection between the external power supply and the second PMOS switch circuit and / or the third PMOS switch circuit based on the charging permission signal;

[0050] The second PMOS switch circuit is also connected to the main control module and the first battery pack respectively, and the second PMOS switch circuit includes at least a second PMOS tube and a third PMOS tube with sources connected to each other, and is used to conduct the connection between the external power supply and the first battery pack according to the first charging priority control signal of the main control module;

[0051] The third PMOS tube switch circuit is also connected to the main control module and the second battery pack respectively. The third PMOS tube switch circuit includes at least a fourth PMOS tube and a fifth PMOS tube with sources connected to each other, and is used to conduct the connection between the external power supply and the second battery pack according to the second charging priority control signal of the main control module.

[0052] In one implementation of the present application, the plurality of battery packs include at least a first battery pack and a second battery pack; the discharge management unit includes at least: a fourth PMOS tube switch circuit, a fifth PMOS tube switch circuit, and a sixth PMOS tube switch circuit;

[0053] The fourth PMOS switch circuit is respectively connected to the first battery pack, the main control module and the sixth PMOS switch circuit, and the fourth PMOS switch circuit at least includes the sixth PMOS and the seventh PMOS connected to each other at source electrodes, and is used to conduct the connection between the first battery pack and the sixth PMOS switch circuit according to the first discharge priority control signal of the main control module;

[0054] The fifth PMOS switch circuit is respectively connected to the second battery pack, the main control module and the sixth PMOS switch circuit, and the fifth PMOS switch circuit at least includes the eighth PMOS and the ninth PMOS connected to each other at source electrodes, and is used to conduct the connection between the second battery pack and the sixth PMOS switch circuit according to the second discharge priority control signal of the main control module;

[0055] The sixth PMOS tube switch circuit is at least respectively connected to the fourth PMOS tube switch circuit, the fifth PMOS tube switch circuit, the main control module, the connected load and the temperature control module. The sixth PMOS tube switch circuit includes at least a tenth PMOS tube, which is used to conduct the connection between the fourth PMOS tube switch circuit and / or the fifth PMOS tube switch circuit and the connected load respectively based on the discharge permission signal, and conduct the connection between the fourth PMOS tube switch circuit and / or the fifth PMOS tube switch circuit and the temperature control module respectively.

[0056] Compared with the prior art, the present invention has the following significant effects:

[0057] (1) Through the above technical solution, a large-capacity battery pack that is inconvenient to carry can be replaced with multiple small-capacity battery packs, thereby improving the portability and battery life of the device, and realizing intelligent management and automated control of charging and discharging, which can enhance the environmental adaptability of the battery pack during operation, ensure that the battery pack works in a safe and efficient state, and improve the user experience of the electronic device.

[0058] (2) This application fully considers the impact of temperature on battery performance, and accordingly designs a flexible battery pack temperature regulation control strategy, which can be intelligently adjusted according to the charging and discharging requirements of different environmental conditions and occasions to ensure that the battery pack is always in the best operating state. This intelligent control method not only improves the efficiency of battery pack charging and discharging management, but also effectively extends the service life of the battery pack.

[0059] (3) This application reduces the energy loss caused by improper temperature charging and discharging of the battery pack through a precise temperature control mechanism, which helps achieve the goal of energy conservation and emission reduction. At the same time, the temperature control module, charging management unit, and discharge management unit of this application work together, which improves the system flexibility and scalability of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0061] Figure 1 A schematic flow chart of a charge and discharge control method for a battery pack in an embodiment of the present application;

[0062] Figure 2 This is a schematic structural diagram of a charge and discharge control device for a battery pack in an embodiment of the present application;

[0063] Figure 3 A circuit schematic diagram of a charge and discharge control device for a battery pack in an embodiment of the present application;

[0064] Figure 4 This is a circuit schematic diagram of a voltage stabilizing unit of a charge and discharge control device for a battery pack in an embodiment of the present application;

[0065] Figure 5 This is a circuit schematic diagram of a temperature detection unit of a charge and discharge control device for a battery pack in an embodiment of the present application;

[0066] Figure 6 A circuit schematic diagram of a heating unit of a charge and discharge control device for a battery pack in an embodiment of the present application;

[0067] Figure 7 This is a circuit schematic diagram of a heat dissipation unit for a charge and discharge control device of a battery pack in an embodiment of the present application. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0069] The embodiments of the present application provide a charge and discharge control method and device for a battery pack, which are used to solve the technical problems that current battery packs are inconvenient to carry and have limited performance under cold conditions, thereby affecting the battery life and flexibility of use of electronic devices and resulting in poor user experience.

[0070] The following describes in detail various embodiments of the present application in conjunction with the accompanying drawings.

[0071] The present application embodiment provides a charge and discharge control method for a battery pack, such as Figure 1 As shown, the method may include steps S101-S105:

[0072] S101, the microcontroller obtains the detected temperatures of multiple battery packs collected by a preset temperature control module.

[0073] In other words, the present application is applied to electronic devices that contain, connect or can connect multiple battery packs. The execution subject of the above-mentioned charge and discharge control method for the battery pack is the microcontroller of the electronic device, such as a microcontroller unit (MCU). The execution subject is not limited to the MCU, but can also be other types of computational hardware units. The present application does not make specific restrictions on this. At the same time, the execution subject can be composed of multiple chips. For example, the logic of the charge and discharge control part of the present application can be controlled by the first chip, and other control logics are controlled by the second chip. The present application does not make specific restrictions on this.

[0074] The above-mentioned multiple battery packs can be multi-battery packs that split large-capacity single battery packs that are restricted by transportation, such as splitting a 100wh single battery pack into two small-capacity battery packs. Splitting a large-capacity battery pack into multiple battery packs can achieve a single battery pack capacity of less than 100wh, which is convenient for carrying into public transportation, while increasing the overall battery capacity of the equipment, providing long battery life and high load capacity.

[0075] The stacking methods used by each battery pack include but are not limited to 3S1P (three series and one parallel), 3S2P (three series and two parallel), 4S1P (four series and one parallel) and 4S2P (four series and two parallel). For example, 3S2P can be understood as a total of 6 battery cells, and after every two cells are connected in parallel to form a module, 3 modules are connected in series. The stacking method and battery material of multiple battery packs need to be consistent, and the voltage of multiple battery packs must be less than the input voltage of the external power supply. Battery materials include but are not limited to lithium cobalt oxide, nickel cobalt lithium, lithium iron phosphate, and solid lithium. The capacity of each battery pack can be less than 100wh. Multiple battery packs are connected in parallel in electronic devices, such as two battery packs are connected in parallel in electronic devices.

[0076] In an embodiment of the present application, the power supply mode of the above-mentioned temperature control module includes at least one of the following: power supply by an external power supply, power supply by a battery pack, and power supply by a wide temperature power supply unit.

[0077] Specifically, obtaining the detected temperatures of multiple battery packs collected by a preset temperature control module specifically includes:

[0078] The detected temperature of each battery pack from the temperature control module under the corresponding power supply mode is obtained based on the connection state of the external power supply and the discharge activation state of the battery pack, and the discharge activation state represents whether the battery pack is in a state allowing discharge.

[0079] Furthermore, when the connection state is connected, the corresponding power supply mode is power supply by an external power supply; when the connection state is disconnected and the discharge activation state is activated, the corresponding power supply mode is power supply by a battery pack; otherwise, the corresponding power supply mode is power supply by a wide temperature power supply unit.

[0080] That is to say, the temperature control module of the present application has multiple power supply modes, and the multiple power supply modes have different trigger conditions, and the trigger conditions include whether the external power supply is supplying power normally and whether the battery pack can discharge normally, wherein the factors affecting the normal discharge of the battery pack include whether the external power supply is connected and whether the detected temperature is in the discharge temperature range of the battery pack, that is, the second temperature range. When the battery pack is in the second temperature range, the discharge performance is better and the loss to the service life of the battery pack is minimized. When the battery pack is in the first temperature range, the charging performance is the best and the loss to the service life of the battery pack is minimized. The second temperature range and the first temperature range correspond to the optimal discharge operating temperature window of the battery pack and the optimal charging operating temperature window of the battery pack, respectively. The specific settings can be made by the user according to the usage scenario or battery pack parameters, or by expert experience. This application does not make specific restrictions on this. For example, the second temperature range is [0, 60] degrees Celsius, and the first temperature range is [0, 45] degrees Celsius.

[0081] Among them, if the external power supply is powered, the connection state of the external power supply is connected, and the temperature control module is powered by the external power supply; when the external power supply is no longer connected, that is, the connection state is disconnected, if it is in the discharge temperature range of the battery pack and the battery pack is normally connected to the connected load and the battery pack has a dischargeable voltage, the discharge activation state is activated, and the temperature control module is powered by the battery pack; when the external power supply is not connected, the battery pack discharge activation state is not activated, such as not being in the above-mentioned second temperature range, the wide temperature power supply unit plays a role, and the temperature control module is powered by the wide temperature power supply unit. Among them, the selection of the three power supply modes of the external power supply, the battery pack, and the wide temperature power supply unit can be achieved by setting three Schottky diodes. The wide temperature power supply unit can be a small-capacity battery with a wide temperature, and its discharge allowable temperature range is much larger than the battery pack. The wide temperature power supply unit includes but is not limited to lithium batteries, capacitors, sodium batteries, etc., such as wide temperature AA batteries, less than 1wh, and the discharge allowable temperature range is [-40, 85] degrees Celsius, 3.7V. During actual use, the voltage of the wide temperature power supply unit is lower than the voltage of the battery pack, and the voltage of the battery pack is lower than the voltage of the external power supply. Through three Schottky diodes, a corresponding power supply mode with a higher voltage can be selected to power the temperature control module.

[0082] In addition, the temperature control module includes at least three parts: one or more temperature detection units for monitoring the battery pack, a heating unit for heating the battery pack, and a heat dissipation unit for dissipating heat from the battery pack. The temperature detection unit can be an NTC thermistor, a temperature sensor, etc., and the number of temperature detection units can be the same as the number of battery packs; the heating unit includes but is not limited to electric heating wires, ceramic sheets, and semiconductor heating sheets; the heat dissipation unit includes but is not limited to fans and semiconductor cooling sheets. Both the heating unit and the heat dissipation unit can be set in one, and the number of heating units and heat dissipation units set is not specifically limited in this application.

[0083] S102, the microcontroller determines whether each battery pack meets a preset charge and discharge condition based on each detected temperature, so as to generate a charge permission signal or a discharge permission signal or a temperature adjustment signal.

[0084] In the embodiment of the present application, based on each detected temperature, determining whether each battery pack meets the preset charge and discharge conditions so as to generate a charge permission signal or a discharge permission signal or a temperature adjustment signal specifically includes:

[0085] Determine the connection status of the external power supply. When the connection status is determined to be connected, match the detected temperature with the preset first temperature interval. If the matching result is that the detected temperature is in the first temperature interval, determine that the corresponding battery pack meets the charging condition to generate a charging permission signal. If the matching result is that the detected temperature is not in the first temperature interval, determine that the corresponding battery pack does not meet the charging condition to generate a temperature adjustment signal to adjust the temperature of the battery pack until the detected temperature of the battery pack is in the first temperature interval.

[0086] In other words, when the electronic device of the present application is connected to an external power supply module, that is, connected to an external power supply module, the microcontroller matches the above-mentioned detected temperature with the preset first temperature range to determine whether the detected temperature is within the preset first temperature range. If it is within the first temperature range, it means that the corresponding battery pack is within the optimal charging temperature range, and the microcontroller generates a charging permission signal. If the detected temperature is not within the preset first temperature range, the battery pack should not be charged directly at this time. The microcontroller determines that the battery pack does not meet the charging conditions and needs to adjust the temperature of the battery pack first, that is, generate a temperature adjustment signal, so that the battery pack temperature reaches the first temperature range before charging. The temperature adjustment signal includes a heating adjustment signal and a heat dissipation adjustment signal.

[0087] In addition, the microcontroller of the present application can also sample whether the first power supply current of the external power supply exceeds the first current threshold after connecting to the external power supply. If it exceeds, the microcontroller does not generate a charging permission signal. The first current threshold is used to prevent the first power supply current from overcurrent and affect the operating state of the device. The first current threshold can be set by the user, and the present application does not make specific restrictions on this.

[0088] In another embodiment of the present application, based on each detected temperature, determining whether each battery pack meets a preset charge and discharge condition so as to generate a charge permission signal or a discharge permission signal or a temperature adjustment signal specifically includes:

[0089] Determine the connection status of the external power supply. When it is determined that the connection status is disconnected, match the detected temperature with a preset second temperature interval. If the matching result is that the detected temperature is in the second temperature interval, determine that the corresponding battery pack meets the discharge condition to generate a discharge permission signal. If the matching result is that the detected temperature is not in the second temperature interval, determine that the corresponding battery pack does not meet the discharge condition to generate a temperature adjustment signal to adjust the temperature of the battery pack until the detected temperature of the battery pack is in the second temperature interval.

[0090] That is to say, when the electronic device is no longer connected to an external power supply, the battery pack is not in a charging state, and the connected load needs to be powered by the battery pack. In this case, the wide temperature power supply unit can first power the temperature control module to detect the current detection temperature. If the detection temperature is within the second temperature range, it means that the battery pack meets the discharge conditions, and the microcontroller generates a discharge permission signal to open the discharge circuit of the battery pack, and the battery pack supplies power to the temperature control module. If the detection temperature is not within the second temperature range, it means that the battery pack does not meet the discharge conditions, and the microcontroller generates a temperature adjustment signal. The wide temperature power supply unit supplies power to the heating unit and the heat dissipation unit in the temperature control module to adjust the battery pack temperature until the battery pack temperature is within the second temperature range, and the microcontroller generates a discharge permission signal again.

[0091] The use of one wide-temperature power supply unit to control the temperature of multiple battery packs can reliably and safely start the heating and cooling units, making it easier to start the charging and discharging of the battery packs.

[0092] In addition, when the microcontroller supplies power to the connected load through the battery pack, it will sample the second power supply current of the battery pack. If the second power supply current is greater than the second current threshold, the microcontroller controls the discharge circuit to disconnect. The second current threshold is used to prevent the second power supply current from overcurrent and affect the operating state of the device. This protects the battery pack from being disconnected for a long time. The second current threshold can be set by the user, and this application does not make specific restrictions on this.

[0093] In another embodiment of the present application, the method further includes:

[0094] When it is determined that the connection state of the external power supply is connected, an external discharge signal is generated and sent to the discharge management unit to connect the external power supply to the connected load so that the external power supply supplies power to the connected load.

[0095] In other words, after the external power supply is connected to the electronic device, the connected load can be powered by the external power supply, and a MOS tube (positive channel Metal Oxide Semiconductor, PMOS) switch circuit with an eighth n-type substrate and a p-channel that transports current by the flow of holes can be included between the external power supply and the connected load. At the same time, a sampling circuit for sampling the power supply current of the external power supply is connected to the front end of the connected load to prevent the current from being greater than the second current threshold.

[0096] Through the above solution, the charging and discharging of the battery pack can be achieved more safely and efficiently, ensuring the optimal performance of the battery pack.

[0097] S103, when the microcontroller generates a charging permission signal, the microcontroller sends the charging permission signal to the charging management unit to connect the external power supply to each battery pack to provide a charging current to each battery pack.

[0098] In the embodiment of the present application, after sending the charging permission signal to the charging management unit, the method further includes:

[0099] Obtain the battery voltage of each battery pack and compare the battery voltages. Determine the charging priority of each battery pack according to the order of the battery voltages from small to large. The battery voltage is negatively correlated with the priority level of the charging priority. According to the charging priority, control the charging management unit to conduct the connection between the external power supply and the first battery pack of the first charging priority level to provide a charging current to the first battery pack until the battery voltage of the first battery pack is equal to the battery voltage of the second battery pack of the next charging priority level, and control the charging management unit to conduct the connection between the external power supply and the first battery pack and the second battery pack at the same time, so that each battery pack is charged synchronously until each battery pack satisfies the charging termination condition at the same time. The connection between the external power supply and each battery pack includes a BUCK circuit, and a BUCK circuit has a one-to-many relationship with each battery pack.

[0100] That is to say, the present application can select the battery pack that needs to be charged first according to the current battery voltage of each battery pack, and when the battery voltages of multiple battery packs are the same, the external power supply can charge each battery pack at the same time. It should be noted that after the microcontroller obtains the battery voltage of each battery pack, it can further determine whether charging is required based on the voltage value. When the voltage value is less than the first predetermined voltage value, it is determined that the corresponding battery pack needs to be charged. If the battery voltage of each battery pack is greater than or equal to the first predetermined voltage value, the microcontroller does not execute the above steps after comparing the battery voltages. If there is a battery pack whose battery voltage is less than the first predetermined voltage value, the above charging steps are executed. The first predetermined voltage value can be understood as the voltage value in the fully charged state, which can be set according to the actual battery pack parameters used, and the present application does not make specific restrictions on this. The first predetermined voltage value can be set by the user according to the actual usage scenario, and the present application does not make specific restrictions on this.

[0101] The above charging priority can be understood as follows: the smaller the battery voltage, the higher the charging priority. Once the battery voltages of multiple battery packs are equal and are all less than the predetermined voltage value, each battery pack has the same priority, and the external power supply provides charging current for multiple battery packs at the same time. Among them, the connection between the external power supply and the multiple battery packs includes a BUCK circuit, and the charging current of the external power supply flows to each battery pack in parallel through the BUCK circuit. The microcontroller controls the charging and discharging of the battery pack using a pulse width modulation (PWM) signal.

[0102] In another embodiment of the present application, when the battery voltages between the battery packs are unequal again during the synchronous charging process of the battery packs, the microcontroller generates PWMs with different duty cycles according to the proportional relationship between the battery voltages, and the PWMs with different duty cycles are respectively sent to different battery pack charging control terminals (such as the connection terminals of the second PMOS tube switch circuit and the third PMOS tube switch circuit with the main control module, respectively) to adjust the charging current between different battery packs, so as to always keep the voltages of each battery pack equal during the charging stage until the charging termination condition is met. The corresponding relationship between the proportional relationship and the duty cycle of PWM can be set according to the actual battery pack parameters used, and this application does not make specific restrictions on this. The charging termination condition may be that the battery pack temperature is no longer within the first temperature range, or the battery voltages of each battery pack are greater than or equal to the first predetermined voltage value.

[0103] Through the above scheme, on the one hand, it is possible to safely and efficiently charge multiple battery packs, and to complete the charging requirements in an orderly and synchronous manner. On the other hand, using one BUCK circuit can realize the charging of multiple battery packs, which can make multiple battery packs enter the constant voltage stage at the same time, significantly reducing the charging time. Because in the past, if two battery packs were to be charged, they had to be charged one by one, and they had to go through two main stages: constant current and constant voltage. The constant voltage stage is a trickle charge, which is only 1 / 15 of the constant current charging value. Charging multiple battery packs at the same time can make multiple battery packs enter the constant voltage stage at the same time, which will significantly reduce the charging time.

[0104] S104, when the microcontroller generates a discharge permission signal, the microcontroller sends the discharge permission signal to the discharge management unit to connect each battery pack to the connected load so that each battery pack can supply power to the connected load.

[0105] In the embodiment of the present application, after sending the discharge permission signal to the discharge management unit, the method further includes:

[0106] Obtain the battery voltage of each battery pack and compare the battery voltages. Determine the discharge priority of each battery pack according to the order of the battery voltages from large to small. Among them, the battery voltage is positively correlated with the priority level of the discharge priority. According to the discharge priority, control the discharge management unit to turn on the connection between the third battery pack of the first discharge priority level and the connected load to supply power to the connected load until the battery voltage of the third battery pack is equal to the battery voltage of the fourth battery pack of the next discharge priority level, and control the discharge management unit to simultaneously turn on the connection between the third battery pack, the fourth battery and the connected load respectively, so that each battery pack discharges synchronously until each battery pack satisfies the discharge termination condition at the same time.

[0107] In other words, during the discharge process of each battery pack, the microcontroller can give priority to discharging a certain battery pack according to the size of the battery voltage. Specifically, the microcontroller preferentially turns on the battery pack with the largest battery voltage as the circuit for connecting to the load for power supply, until the battery voltage decreases to be equal to the battery voltage of the battery pack with the next discharge priority level, at which time the two battery packs discharge together until the discharge termination condition is met. The discharge termination condition may be that the temperature of each battery pack is not within the second temperature range, or the power of each battery pack is less than a second predetermined voltage value, and the second predetermined voltage value represents the threshold value at which the battery pack power is insufficient to supply power to the connected load. The second predetermined voltage value may be set by the user according to the actual usage scenario, and this application does not make specific limitations on this.

[0108] Based on this, the present application can achieve orderly battery pack discharge management. The above discharge management method is conducive to smooth temperature changes of the battery pack, while improving the power supply stability to the connected load and providing support for synchronous charging.

[0109] S105, when the microcontroller generates a temperature adjustment signal, the microcontroller sends the temperature adjustment signal to the temperature control module to heat or dissipate heat for each battery pack so that it meets the preset charge and discharge conditions.

[0110] The microcontroller can control the temperature control module to perform heating and heat dissipation functions. Specifically, when the temperature adjustment signal is a heating adjustment signal, the heating unit in the temperature control module is turned on, and the heating unit generates heat to increase the temperature around the battery pack until the detection temperature collected by the temperature detection unit reaches the required temperature range. When the temperature adjustment signal is a heat dissipation adjustment signal, the heat dissipation unit in the temperature control module is turned on, and the heat dissipation unit operates to reduce the temperature around the battery pack until the detection temperature collected by the temperature detection unit reaches the required temperature range.

[0111] Through the above technical solution, the large-capacity battery pack that is inconvenient to carry can be replaced with multiple small-capacity battery packs, which improves the portability of the device and improves the endurance of the device. At the same time, this application fully considers the impact of temperature on battery performance, flexibly adjusts and controls the temperature of the battery pack, and can meet the charging and discharging requirements of different environmental conditions and different occasions. The intelligent control method of this application not only improves the efficiency of battery pack charging and discharging management, but also ensures the optimal operating state of the battery pack under different working conditions, and extends the service life of the battery pack.

[0112] In addition, the present application reduces the energy loss caused by charging and discharging the battery pack at improper temperature through precise temperature control, which helps to achieve the goal of energy conservation and emission reduction. The temperature control module, charging management unit, and discharge management unit of the present application work together to improve the flexibility and scalability of the system. Furthermore, the charging and discharging control scheme based on the above-mentioned intelligent management and automated control enhances the environmental adaptability of the battery pack during operation, ensures that the battery pack operates in a safe and efficient state, and improves the user experience of the electronic device.

[0113] Figure 2 A schematic diagram of a charge and discharge control device for a battery pack provided in an embodiment of the present application is shown in FIG. Figure 2 As shown, the charge and discharge control device for a battery pack is used to connect multiple battery packs 400, Figure 2 Only two battery packs are shown, namely the first battery pack 401 and the second battery pack 402. The present application does not specifically limit the number of battery packs. The charge and discharge control device 200 for the battery pack includes: a main control module 201, a charging management unit 202, a discharging management unit 203 and a temperature control module 204 respectively connected to the main control module 201.

[0114] The charging management unit 202 is respectively connected to the external power supply 300 and each battery pack 400, and is used to conduct the external power supply 300 and each battery pack 400 based on the charging permission signal of the main control module 201, so as to provide charging current to each battery pack 400. The discharge management unit 203 is respectively connected to each battery pack 400 and the connected load 500, and is used to conduct each battery pack 400 and the connected load 500 based on the discharge permission signal of the main control module 201, so that each battery pack 400 supplies power to the connected load 500. The temperature control module 204 is respectively connected to the discharge management unit 203 and the external power supply 300, and is used to collect the detected temperature of each battery pack 400 in the corresponding power supply mode and send it to the main control module 201, and heat or dissipate heat for each battery pack 400 based on the temperature adjustment signal of the main control module 201, so that it meets the preset charging and discharging conditions. Among them, the corresponding power supply mode at least includes the external power supply 300 or the discharge management unit 203 supplying power to the temperature control module 204. The main control module 201 is used to execute the steps of the above-mentioned charge and discharge control method for a battery pack.

[0115] The temperature control module 204 includes a temperature detection unit 2041, a heating unit 2042, and a heat dissipation unit 2043. The temperature detection unit is used for detecting temperature, the heating unit is used for heating, and the heat dissipation unit is used for heat dissipation.

[0116] In the embodiment of the present application, the charge and discharge control device 200 for a battery pack further includes: a wide temperature power supply unit 205 .

[0117] The wide temperature power supply unit 205 is used to supply power to the temperature control module 204 in a corresponding power supply mode when the external power supply 300 is disconnected and the discharge activation state is not activated. The discharge activation state indicates whether the battery pack is in a discharge-allowed state.

[0118] In the embodiment of the present application, the charge and discharge control device 200 for a battery pack further includes: a voltage stabilizing unit 206 .

[0119] The voltage stabilizing unit 206 is respectively connected to the external power supply 300, the discharge management unit 203 and the wide temperature power supply unit 205, and is used to supply power to the temperature control module 204 in a corresponding power supply mode through three diodes corresponding to the external power supply 300, the discharge management unit 203 and the wide temperature power supply unit 205. In other words, the temperature control module realizes the power supply process of the above corresponding power supply mode through the voltage stabilizing unit.

[0120] In addition, the main control module is also connected to the first battery pack and the second battery pack to obtain the battery voltage of the battery pack, so as to determine whether each battery pack needs to be charged or whether the power supports discharge, charging priority, discharging priority, etc.

[0121] refer to Figure 3 When there are two battery packs, the circuit schematic diagram of the charge and discharge control corresponding to the charge management unit (numbered as #4 charge management unit in the figure) and the discharge management unit (numbered as #5 discharge management unit in the figure) is as follows Figure 3 As shown, U3 is connected to an external power supply, and the port of DCIN is connected to a voltage stabilizing unit; R31 is connected to the first power supply current sampling circuit of the external power supply as a current sampling resistor, and the first power supply current is amplified by a differential operational amplifier and sent to the main control module through the CUR_TOP_ADC pin to determine whether it exceeds the first current threshold. If it does not exceed the first current threshold, it is allowed to subsequently control VBAT1_IN_CTR and VBAT2_IN_CTR to be pulled high, so that the second PMOS tube Q7A, the third PMOS tube Q7B, the fourth PMOS tube Q12A, and the fifth PMOS tube Q12B are turned on; otherwise, it is not allowed to subsequently control VBAT1_IN_CTR and VBAT2_IN_CTR to be pulled low, so that the PMOS of Q7A, Q7B, Q12A, and Q12B are turned off.

[0122] The charging current of the external power supply enters the charging circuit from DCSUPPLY, such as a BUCK or BOOST circuit or a BUCK / BOOST type charging circuit. Subsequently, the main control module detects whether there is voltage through CHG_OUT_ADC, and detects the values ​​of V_BAT1_ADC and V_BAT2_ADC at the same time, and determines whether the first battery pack and the second battery pack are at the values ​​that need to be charged, thereby controlling VBAT1_IN_CTR and VBAT2_IN_CTR to be pulled high, and the second PMOS tube Q7A, the third PMOS tube Q7B, the fourth PMOS tube Q12A, and the fifth PMOS tube Q12B are turned on. When the detected temperature of the temperature detection unit is within the first temperature range of each battery pack, the charging path to the first battery pack and the second battery pack is opened, and CHG_OUT_CTR is controlled to be pulled high, so that the PMOS of the first PMOS tube Q5A is turned on, and CHG_OUT passes through Q5A to CHG; when the detected temperature exceeds the first temperature range of battery operation, CHG_OUT_CTR is controlled to be pulled low, and the PMOS of Q5A is in the cut-off state, which can shut off the charging path from CHG_OUT to CHG.

[0123] In addition, the main control module detects through V_BAT1_ADC and V_BAT2_ADC that when the voltages of battery pack #1 (i.e., the first battery pack) V_BAT1 and battery pack #2 (i.e., the second battery pack) V_BAT2 are different, the low-voltage battery pack is charged first (VBAT1_IN_CT or VBAT2_IN_CTR is controlled to be pulled high). When the voltages of the two battery packs are equal, they are switched to common charging (VBAT1_IN_CTR and VBAT2_IN_CTR are controlled to be pulled high). During charging, if the voltages of the two battery packs are unequal again, PWM is used to control the charging of the battery packs (PWM controls VBAT1_IN_CT or VBAT2_IN_CTR). The charging currents of the two battery packs are adjusted through different duty cycles to always keep the voltages of the two battery packs equal during the charging stage until charging is completed.

[0124] More specifically, in the embodiment of the present application, the plurality of battery packs at least include a first battery pack and a second battery pack. The charging management unit includes: a first PMOS switch circuit, a second PMOS switch circuit, and a third PMOS switch circuit.

[0125] The first PMOS tube switch circuit is respectively connected to the external power supply, the main control module, the second PMOS tube switch circuit and the third PMOS tube switch circuit, and the first PMOS tube switch circuit at least includes a first PMOS tube, which is used to conduct the connection between the external power supply and the second PMOS tube switch circuit and / or the third PMOS tube switch circuit based on the charging permission signal. The second PMO tube switch circuit is also respectively connected to the main control module and the first battery pack, and the second PMOS tube switch circuit at least includes a second PMOS tube and a third PMOS tube with sources connected to each other, which are used to conduct the connection between the external power supply and the first battery pack according to the first charging priority control signal of the main control module. The third PMO tube switch circuit is also respectively connected to the main control module and the second battery pack, and the third PMOS tube switch circuit at least includes a fourth PMOS tube and a fifth PMOS tube with sources connected to each other, which are used to conduct the connection between the external power supply and the second battery pack according to the second charging priority control signal of the main control module.

[0126] The above-mentioned first charging priority control signal and the second charging priority control signal respectively control the connection between the first battery pack, the second battery pack and the external power supply. The connection between the first battery pack, the second battery pack and the external power supply can be respectively turned on according to the above-mentioned charging priority, and the connection between the first battery pack, the second battery pack and the external power supply can also be turned on at the same time during synchronous charging.

[0127] The present application provides two sets of PMOS switch circuits in each battery pack charging management part, which can control the switch of the battery pack charging path and prevent multiple battery packs from charging each other, thereby improving the charging safety and control flexibility of the battery pack. At the same time, a PMOS switch circuit is provided for each battery pack, which improves the scalability of the battery pack and prevents the battery packs from affecting each other.

[0128] When there is no external power supply DCIN input, the discharge management unit CHG_OUT_ADC does not detect the power supply voltage of the external power supply, controls VBAT1_IN_CTR and VBAT2_IN_CTR to be pulled low, and the PMOS of Q7A, Q7B, Q12A, and Q12B are cut off; when the main control module determines that the detection temperature of the temperature detection unit is within the second temperature range of the discharge of the #1 battery pack and the #2 battery pack, controls VBAT1_OUT_CTR and VBAT2_OUT_CTR to be pulled high, so that the sixth PMOS tube Q3A and the seventh PMOS tube Q7B are turned off. The PMOS of the MOS tube Q3B, the eighth PMOS tube Q4A, and the ninth PMOS tube Q4B are turned on, opening the discharge path of the #1 battery pack and the #2 battery pack to the connected load; the main control module controls DCSUM_CTR to be pulled high, so that the PMOS of the tenth PMOS tube Q5B is turned on, and BAT_OUT passes through Q5B to DCSUM; when it is detected that the temperature exceeds the second temperature range of the battery operation, DCSUM_CTR is controlled to be pulled low, and the PMOS of Q5B is in the cut-off state, which can shut down the circuit path from BAT_OUT to DCSUM.

[0129] In addition, the present application will also detect the discharge current during discharge to ensure discharge safety and avoid overcurrent. DCSUM is input to the differential operational amplifier through the R1 sampling resistor, and is amplified and sent to the main control module from CUR_DCSUM_ADC; if the second power supply current at DCSUM does not exceed the second current threshold, Q3A, Q3B, Q4A, and Q4B are controlled to be turned on, and DCSUPPLY_CTR is controlled to be pulled low, so that Q1A and Q1B are turned off, and V_BAT1 and V_VBAT2 voltages are turned on to BAT_OUT. When Q5B is turned on, DCSUM and BAT_OUT are turned on to the load voltage DCOUT; when the second current threshold is exceeded, Q3A, Q3B, Q4A, and Q4B are turned off, DCSUPPLY_CTR continues to be pulled low, and the battery pack stops supplying power to the load DCOUT. Among them, the discharge management unit also includes a seventh PMOS tube switch circuit, which is respectively connected to the external power supply, the connected load and the main control module. When the external power supply is connected and supplies power to the connected load, DCSUPPLY_CTR is pulled high to turn on the eleventh PMOS tube Q1A and the twelfth PMOS tube Q1B in the seventh PMOS tube switch circuit. At this time, the current of the external power supply flows to DCSUM.

[0130] More specifically, the plurality of battery packs include at least a first battery pack and a second battery pack. The discharge management unit includes at least: a fourth PMOS switch circuit, a fifth PMOS switch circuit, and a sixth PMOS switch circuit.

[0131] The fourth PMOS tube switch circuit is respectively connected to the first battery pack, the main control module and the sixth PMOS tube switch circuit, and the fourth PMOS tube switch circuit at least includes a sixth PMOS tube and a seventh PMOS tube whose sources are connected to each other, and is used to conduct the connection between the first battery pack and the sixth PMOS tube switch circuit according to the first discharge priority control signal of the main control module. The fifth PMOS tube switch circuit is respectively connected to the second battery pack, the main control module and the sixth PMOS tube switch circuit, and the fifth PMOS tube switch circuit at least includes an eighth PMOS tube and a ninth PMOS tube whose sources are connected to each other, and is used to conduct the connection between the second battery pack and the sixth PMOS tube switch circuit according to the second discharge priority control signal of the main control module. The sixth PMOS tube switch circuit is at least respectively connected to the fourth PMOS tube switch circuit, the fifth PMOS tube switch circuit, the main control module, the connected load and the temperature control module. The sixth PMOS tube switch circuit includes at least a tenth PMOS tube, which is used to conduct the connection between the fourth PMOS tube switch circuit and / or the fifth PMOS tube switch circuit and the connected load respectively based on the discharge permission signal, and to conduct the connection between the fourth PMOS tube switch circuit and / or the fifth PMOS tube switch circuit and the temperature control module respectively.

[0132] The above-mentioned first discharge priority control signal and the second discharge priority control signal respectively control the connection between the first battery pack, the second battery pack and the connected load. The connection between the first battery pack, the second battery pack and the connected load can be respectively turned on according to the above-mentioned priority, or the connection can be discharged synchronously so that the connection between the first battery pack, the second battery pack and the connected load is turned on at the same time.

[0133] During discharge, when the voltages of battery pack #1 V_BAT1 and battery pack #2 V_BAT2 are different, a discharge permission signal is generated to discharge the high-voltage battery pack first, so as to control VBAT1_OUT_CTR or VBAT2_OUT_CTR to be pulled high. When the voltages of the two battery packs are equal, they are switched to common discharge, so that VBAT1_OUT_CTR and VBAT2_OUT_CTR are pulled high. The present application sets two groups of PMOS tube switch circuits in each battery pack discharge management part, which can not only serve as switches for the battery pack discharge path, but also avoid mutual charging and discharging between multiple battery packs, thereby improving the discharge safety and control flexibility of the battery pack. At the same time, a PMOS tube switch circuit is set for each battery pack, which improves the scalability of the battery pack and avoids mutual influence between battery packs.

[0134] Figure 4 This is the circuit schematic diagram of the voltage stabilizing unit, such as Figure 4As shown, the voltage stabilizing unit includes three Schottky diodes D1, D2, and D3, D1 is connected to DCIN, D2 is connected to the above-mentioned DCSUM, D3 is connected to the output port BAT_AA of the wide temperature power supply unit BT1, and DCTEMP is connected to the heating unit and the heat dissipation unit to supply power to the heating unit and the heat dissipation unit. U1 is a voltage stabilizing chip, which is used to output VCC to power each module after stabilizing the supply voltage. The model of U1 can be selected by the user according to actual needs, and this application does not make specific restrictions on this. Through the forward conduction and reverse cutoff characteristics of the diode, the input voltage of the voltage stabilizing chip is automatically switched, which can extend the service life of the wide temperature power supply unit.

[0135] Figure 5 The circuit diagram of the temperature detection unit is as follows: Figure 5 As shown, NTC1 and NTC2 are used to detect the detection temperature of the first battery pack and the second battery pack respectively, and the VCC pin is connected to the VCC pin of the above-mentioned voltage stabilizing unit; NTC_ADC1 and NTC_ADC2 are respectively connected to the main control module for transmitting the collected detection temperature.

[0136] Figure 6 The circuit diagram of the heating unit is shown in Figure 2. Figure 6 As shown, DCTEMP is connected to the above voltage stabilizing unit, HEATING_CTR is connected to the main control module, and Heating1 can be connected to a heating wire, a ceramic sheet, etc. When HEATING_CTR is pulled high, the heater (including but not limited to heating wire, ceramic sheet, semiconductor heating sheet, etc.) connected to Heating1 can be operated; when HEATING_CTR is controlled to be pulled low, the heater connected to Heating1 can be stopped from working.

[0137] Figure 7 is the circuit schematic diagram of the heat dissipation unit, such as Figure 7 As shown, DCTEMP is connected to the above voltage stabilizing unit, FAN_CTR is connected to the main control module, and FAN1 can be connected to a fan, semiconductor cooling sheet, etc. When FAN_CTR is pulled high, the heat sink connected to FAN1 (including but not limited to fans, semiconductor cooling sheets, etc.) can be operated; when FAN_CTR is controlled to be pulled low, the heat sink connected to FAN1 can be stopped from working.

[0138] Each embodiment in this application is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0139] The device and method provided in the embodiments of the present application correspond one to one, and therefore, the device also has similar beneficial technical effects as the corresponding method. Since the beneficial technical effects of the method have been described in detail above, the beneficial technical effects of the device will not be repeated here.

[0140] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0141] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A charge and discharge control method for a battery pack, characterized in that: The method comprises: Acquire the detected temperatures of multiple battery packs collected by a preset temperature control module; Based on each of the detected temperatures, determining whether each of the battery packs meets a preset charge and discharge condition, so as to generate a charge permission signal or a discharge permission signal or a temperature adjustment signal; Wherein, when the charging permission signal is generated, the charging permission signal is sent to the charging management unit to connect the external power supply to each of the battery packs to provide a charging current to each of the battery packs; When the discharge permission signal is generated, the discharge permission signal is sent to a discharge management unit to conduct the connection between each battery pack and the connected load, so that each battery pack supplies power to the connected load; When the temperature adjustment signal is generated, the temperature adjustment signal is sent to the temperature control module to heat or dissipate heat for each battery pack so that the battery pack meets the preset charge and discharge conditions.

2. A charge and discharge control method for a battery pack according to claim 1, characterized in that: The power supply mode of the temperature control module includes at least one of the following: power supply from an external power supply, power supply from a battery pack, or power supply from a wide temperature power supply unit; Acquiring the detected temperatures of multiple battery packs collected by a preset temperature control module, specifically including: Acquire the detected temperature of each battery pack from the temperature control module under a corresponding power supply mode; the corresponding power supply mode is obtained based on the connection state of the external power supply and the discharge activation state of the battery pack; the discharge activation state indicates whether the battery pack is in a state allowing discharge; Wherein, when the connection state is connected, the corresponding power supply mode is power supply by the external power supply; When the connection state is disconnected and the discharge activation state is activated, the corresponding power supply mode is powering the battery pack; Otherwise, the corresponding power supply mode is power supply by a wide temperature power supply unit.

3. A charge and discharge control method for a battery pack according to claim 1, characterized in that: Based on each of the detected temperatures, determining whether each of the battery packs meets a preset charge and discharge condition so as to generate a charge permission signal or a discharge permission signal or a temperature adjustment signal specifically includes: Determining the connection status of the external power supply; After determining that the connection state is connected, matching the detected temperature with a preset first temperature range; When the matching result is that the detected temperature is within the first temperature range, determining that the corresponding battery pack meets the charging condition, so as to generate the charging permission signal; When the matching result is that the detected temperature is not within the first temperature range, it is determined that the corresponding battery pack does not meet the charging condition, so as to generate the temperature adjustment signal to adjust the temperature of the battery pack until the detected temperature of the battery pack is within the first temperature range.

4. A charge and discharge control method for a battery pack according to claim 1 or 2, characterized in that: Based on each of the detected temperatures, determining whether each of the battery packs meets a preset charge and discharge condition so as to generate a charge permission signal or a discharge permission signal or a temperature adjustment signal specifically includes: Determining the connection status of the external power supply; After determining that the connection state is disconnected, matching the detected temperature with a preset second temperature range; When the matching result is that the detected temperature is within the second temperature range, determining that the corresponding battery pack meets the discharge condition, so as to generate the discharge permission signal; When the matching result is that the detected temperature is not in the second temperature range, it is determined that the corresponding battery pack does not meet the discharge condition, so as to generate the temperature adjustment signal to adjust the temperature of the battery pack until the detected temperature of the battery pack is in the second temperature range.

5. A charge and discharge control method for a battery pack according to claim 3, characterized in that: The method further comprises: When it is determined that the connection state of the external power supply is connected, an external discharge signal is generated and sent to the discharge management unit to conduct the connection between the external power supply and the connected load so that the external power supply supplies power to the connected load.

6. A charge and discharge control method for a battery pack according to claim 1, characterized in that: After sending the charging permission signal to the charging management unit, the method further includes: Obtaining the battery voltage of each of the battery packs and comparing the battery voltages; Determining the charging priority of each battery pack according to the order of the battery voltage from small to large; wherein the battery voltage and the priority level of the charging priority are negatively correlated; According to the charging priority, the charging management unit is controlled to turn on the connection between the external power supply and the first battery pack of the first charging priority level to provide a charging current to the first battery pack until the battery voltage of the first battery pack is equal to that of the second battery pack of the next charging priority level, and the charging management unit is controlled to simultaneously turn on the connection between the external power supply and the first battery pack and the second battery pack respectively to charge the battery packs synchronously until the battery packs simultaneously meet the charging termination condition; wherein the connection between the external power supply and each of the battery packs includes a BUCK circuit, and the one BUCK circuit has a one-to-many relationship with each of the battery packs.

7. A charge and discharge control method for a battery pack according to claim 1, characterized in that: After sending the discharge permission signal to the discharge management unit, the method further includes: Obtaining the battery voltage of each of the battery packs and comparing the battery voltages; Determining the discharge priority of each of the battery packs according to the order of the battery voltages from large to small; wherein the battery voltages are positively correlated with the priority levels of the discharge priorities; According to the discharge priority, the discharge management unit is controlled to turn on the connection between the third battery pack of the first discharge priority level and the connected load to supply power to the connected load until the battery voltage of the third battery pack is equal to that of the fourth battery pack of the next discharge priority level, and the discharge management unit is controlled to simultaneously turn on the connection between the third battery pack, the fourth battery and the connected load respectively to enable the battery packs to discharge synchronously until the battery packs simultaneously meet the discharge termination conditions.

8. A charge and discharge control device for a battery pack, characterized in that: The device is used to connect multiple battery packs; the device includes: a main control module, a charging management unit, a discharging management unit and a temperature control module respectively connected to the main control module; The charging management unit is connected to the external power supply and each of the battery packs, respectively, and is used to conduct the external power supply and each of the battery packs based on the charging permission signal of the main control module, so as to provide a charging current to each of the battery packs; The discharge management unit is connected to each of the battery packs and the connected load, respectively, and is used to conduct each of the battery packs and the connected load based on the discharge permission signal of the main control module, so that each of the battery packs supplies power to the connected load; The temperature control module is connected to the discharge management unit and the external power supply, respectively, and is used to collect the detected temperature of each battery pack under the corresponding power supply mode and send it to the main control module, and heat or dissipate heat for each battery pack based on the temperature adjustment signal of the main control module to make it meet the preset charging and discharging conditions; wherein the corresponding power supply mode at least includes the external power supply or the discharge management unit supplying power to the temperature control module; The main control module is used to execute a charge and discharge control method for a battery pack as described in any one of claims 1 to 7 above.

9. A charge and discharge control device for a battery pack according to claim 8, characterized in that: The device also includes: a wide temperature power supply unit; The wide temperature power supply unit is used to supply power to the temperature control module in a corresponding power supply mode when the external power supply is disconnected and the discharge activation state is not activated; wherein the discharge activation state indicates whether the battery pack is in a state allowing discharge.

10. A charge and discharge control device for a battery pack according to claim 9, characterized in that: The device further comprises: a voltage stabilizing unit; The voltage stabilizing unit is respectively connected to the external power supply, the discharge management unit and the wide temperature power supply unit, and is used to supply power to the temperature control module in the corresponding power supply mode through three diodes corresponding to the external power supply, the discharge management unit and the wide temperature power supply unit respectively.

11. A charge and discharge control device for a battery pack according to claim 8, characterized in that: The multiple battery packs include at least a first battery pack and a second battery pack; the charging management unit includes: a first PMOS tube switch circuit, a second PMOS tube switch circuit, and a third PMOS tube switch circuit; The first PMOS switch circuit is respectively connected to the external power supply, the main control module, the second PMOS switch circuit and the third PMOS switch circuit, and the first PMOS switch circuit at least includes a first PMOS transistor, which is used to conduct the connection between the external power supply and the second PMOS switch circuit and / or the third PMOS switch circuit based on the charging permission signal; The second PMOS switch circuit is also connected to the main control module and the first battery pack respectively, and the second PMOS switch circuit includes at least a second PMOS tube and a third PMOS tube with sources connected to each other, and is used to conduct the connection between the external power supply and the first battery pack according to the first charging priority control signal of the main control module; The third PMOS tube switch circuit is also connected to the main control module and the second battery pack respectively. The third PMOS tube switch circuit includes at least a fourth PMOS tube and a fifth PMOS tube with sources connected to each other, and is used to conduct the connection between the external power supply and the second battery pack according to the second charging priority control signal of the main control module.

12. A charge and discharge control device for a battery pack according to claim 8, characterized in that: The multiple battery packs include at least a first battery pack and a second battery pack; the discharge management unit includes at least: a fourth PMOS tube switch circuit, a fifth PMOS tube switch circuit, and a sixth PMOS tube switch circuit; The fourth PMOS switch circuit is respectively connected to the first battery pack, the main control module and the sixth PMOS switch circuit, and the fourth PMOS switch circuit at least includes the sixth PMOS and the seventh PMOS connected to each other at source electrodes, and is used to conduct the connection between the first battery pack and the sixth PMOS switch circuit according to the first discharge priority control signal of the main control module; The fifth PMOS switch circuit is respectively connected to the second battery pack, the main control module and the sixth PMOS switch circuit, and the fifth PMOS switch circuit at least includes the eighth PMOS and the ninth PMOS connected to each other at source electrodes, and is used to conduct the connection between the second battery pack and the sixth PMOS switch circuit according to the second discharge priority control signal of the main control module; The sixth PMOS tube switch circuit is at least respectively connected to the fourth PMOS tube switch circuit, the fifth PMOS tube switch circuit, the main control module, the connected load and the temperature control module. The sixth PMOS tube switch circuit includes at least a tenth PMOS tube, which is used to conduct the connection between the fourth PMOS tube switch circuit and / or the fifth PMOS tube switch circuit and the connected load respectively based on the discharge permission signal, and conduct the connection between the fourth PMOS tube switch circuit and / or the fifth PMOS tube switch circuit and the temperature control module respectively.

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