Power battery system, heating control method and device, equipment and storage medium

Abstract

The invention discloses a power battery system, a battery charging control method, device and equipment and a storage medium, the power battery system comprises a power supply module, a direct current charging module, a current control module and a load circuit, the direct current charging module is connected between the positive electrode end and the negative electrode end of the power supply module; the load circuit is connected between the positive terminal and the negative terminal of the DC charging module. The current control module is arranged between the direct current charging module and the power supply module and used for controlling the current transmission direction between the direct current charging module and the power supply module. According to the invention, charging can be carried out at a low temperature, and a rapid battery charging process can be carried out without repeated connection with charging equipment.

Description

Technical Field

[0001] The present application relates to the field of batteries, and specifically to a power battery system, a battery charging control method, a device, a equipment and a storage medium. Background Art

[0002] With the continuous development of power battery technology, power batteries have been widely used in new energy vehicles, consumer electronics, energy storage systems and other fields. However, the use of power batteries in low temperature environments will be subject to certain restrictions. Specifically, the discharge capacity of power batteries in low temperature environments will seriously decline, and the battery cannot be charged in low temperature environments, which seriously reduces the user's car experience satisfaction.

[0003] When charging existing power batteries in a low-temperature environment (temperature below 0°C), a small current must be discharged through the battery first, and then the battery heating module (heating film or PTC) continues to work to heat the battery. The battery can only be charged through the charging device after the battery temperature rises to a certain value. However, when the power battery is low in power (5% to 10%) in a low-temperature environment, the battery can no longer discharge due to the low temperature and power, and the battery heating module cannot work.

[0004] To solve the above problems, a dedicated charger can be installed on the electrical equipment to charge the battery heating module. After the electrical equipment is connected to the charging device, the battery heating module needs to be powered by the charger first, and then the battery pack needs to be heated. After the battery pack temperature rises to a certain value, it can be charged normally. However, after heating the battery pack in this way, the charging device (plug-in gun) needs to be connected again after the heating is completed in order to charge normally. Therefore, the charging process requires personnel to pay attention to the status of the electrical equipment at all times, which is inconvenient for users to use and travel.

[0005] It should be noted that the above statements are only used to provide background technical information related to the present application and do not necessarily constitute prior art. Summary of the invention

[0006] In view of the above problems, the embodiments of the present application provide a power battery system, a battery charging control method, an apparatus, a device and a storage medium. After the system is connected to the charging device, it can be charged at a low temperature without multiple connections to the charging device, thereby achieving fast battery charging.

[0007] In a first aspect, an embodiment of the present application provides a power battery system, comprising: a power supply module, a DC charging module, a current control module and a load circuit, wherein the DC charging module is connected between a positive terminal and a negative terminal of the power supply module, and the load circuit is connected between a positive terminal and a negative terminal of the DC charging module;

[0008] The current control module is disposed between the DC charging module and the power supply module, and is used to control the current transmission direction between the DC charging module and the power supply module.

[0009] By using the power battery system provided in this embodiment, when the battery temperature of the power supply module is low, the current transmission direction between the DC charging module and the power supply module can be controlled to be opposite to the current output direction of the DC charging module, that is, the current is transmitted from the positive end of the power supply module to the positive end of the DC charging module, and from the negative end of the DC charging module to the negative end of the power supply module. In this case, the DC charging module cannot charge the battery, but supplies power to the load circuit. When the battery temperature of the power supply module reaches a certain threshold, the current transmission direction between the DC charging module and the power supply module can be controlled to be opposite to the current output direction of the DC charging module, that is, the positive end of the DC charging module is transmitted to the positive end of the power supply module, and the negative end of the power supply module is transmitted to the negative end of the DC charging module. In this case, the DC charging module can charge the battery. In this way, when the electrical equipment is in a low-temperature ground charge, after the DC charging module is connected to the charging device, the communication connection between the electrical equipment and the charging device can be maintained, and the battery can be heated before charging. After the battery is heated, there is no need to disconnect the DC charging module from the charging device and reconnect it. That is, after the battery is heated, there is no need to unplug the charging gun again, and there is no need for personnel to pay attention to the battery heating of the electrical equipment at all times, which is more convenient for users to use and travel. Moreover, the power battery system provided in the embodiment of the present application does not need to modify the communication protocol with the charging device, and can meet almost all charging devices that meet international standards on the existing market, and has great practicality and versatility.

[0010] In some embodiments, the current control module includes a first circuit and a second circuit connected in parallel. When the first circuit is turned on, a charging loop is formed between the DC charging module and the power supply module; when the second circuit is turned on, the DC charging module and the power supply module are unidirectionally connected, and the current conduction direction is opposite to the current output direction of the DC charging module. In this way, by setting two circuits in parallel, whether the DC charging module can supply power to the power supply module can be controlled by controlling the on-off state of the two circuits, that is, when the battery temperature is low and cannot meet the charging requirements, the first circuit is controlled to be disconnected, and the second circuit is turned on. At this time, the DC charging module supplies power to the load circuit and can heat the battery; and when the battery temperature reaches a certain threshold and meets the charging requirements, the first circuit can be controlled to be turned on. At this time, the DC charging module supplies power to the power supply module, which can realize the low-temperature charging process of the DC charging module when the battery temperature is low.

[0011] In some embodiments, the first circuit includes a first switch, and the first switch is arranged between the same-direction electrode ends of the power supply module and the DC charging module. Thus, the first circuit can be turned on by controlling the first switch to be closed, and the current output by the DC charging module can be input to the power supply module.

[0012] Among them, the first switch and the subsequent second switch, the control switch, the pre-charge switch, etc. can be but are not limited to relays, contactors, etc., as long as they can achieve the conduction and disconnection of the circuit.

[0013] In some embodiments, the second circuit includes a controllable device, which is disposed between the same-direction electrode ends of the power supply module and the DC charging module, and controls the DC charging module to be unidirectionally conductive with the power supply module, and the current conduction direction is opposite to the current output direction of the DC charging module. In this way, the conduction of the second circuit can be achieved by controlling the controllable device to be closed, and the current output by the battery can be input into the DC charging module.

[0014] In some embodiments, the controllable device includes a diode and a second switch connected in series, the positive terminal of the diode is connected to the positive terminal of the power supply module, and the negative terminal of the diode is connected to the positive terminal of the DC charging module. In this way, when the battery temperature meets the charging requirements, the second switch can be controlled to be disconnected to prevent the diode from being broken down by the high voltage of the DC charging module.

[0015] In some embodiments, the controllable device includes a diode and a second switch connected in series, the positive terminal of the diode is connected to the negative terminal of the DC charging module, and the negative terminal of the diode is connected to the negative terminal of the power supply module. In this way, when the battery temperature does not meet the charging requirements, the second switch can be controlled to close (the first switch is disconnected), so that the current between the DC charging module and the battery can only flow from the positive terminal of the battery to the positive terminal of the DC charging module, and from the positive terminal of the DC charging module to the positive terminal of the battery.

[0016] In some embodiments, the load circuit includes a battery heating module, which is connected between the positive terminal and the negative terminal of the DC charging module and is arranged near the battery in the power supply module for heating the battery. When the battery temperature is very low and cannot meet the charging requirements of the electrical equipment (for example, the temperature is greater than 0°C), the DC charging module can be controlled to charge the battery heating module first, and the battery heating works and generates heat, which can heat the battery. And the current between the power supply module and the DC charging module is controlled by the current control module so that it can only be transmitted from the power supply module to the DC charging module, thereby preventing the large current output by the DC charging module from being input into the power supply module when the battery temperature is low, resulting in charging failure, and even lithium precipitation. In addition, since the DC charging module is supplying power to the load circuit, the communication connection between the charging device and the power battery and the electrical equipment can be maintained, and there is no need to reconnect after the heating is completed, that is, there is no need to plug and unplug the charging gun again, which is more convenient for users to use and travel.

[0017] In some embodiments, the load circuit further includes a heating system, and the heating system is disposed between the positive terminal and the negative terminal of the DC charging module. Thus, when the heating system is connected to the DC charging module, the internal space of the electric device can be heated during battery heating and charging, thereby increasing the temperature of the internal space of the electric device and further improving user satisfaction.

[0018] In a second aspect, an embodiment of the present application provides a battery charging system, comprising a charging device and the power battery system described in the first aspect; the charging device is connected to the DC charging module.

[0019] In a third aspect, an embodiment of the present application provides a battery charging control method, which is applied to the power battery system according to the first aspect, and the method includes:

[0020] When it is detected that the temperature of the battery in the power supply module is less than a first threshold, the current control module controls the current transmission direction between the DC charging module and the power supply module, and forms a charging loop between the DC charging module and the load circuit;

[0021] When it is detected that the temperature of the battery in the power supply module is greater than or equal to the first threshold, the current transmission direction between the DC charging module and the power supply module is controlled by the current control module to form a charging loop between the DC charging module and the power supply module.

[0022] In some embodiments, the current control module controls the current transmission direction between the DC charging module and the power supply module, and forms a charging loop between the DC charging module and the load circuit, including:

[0023] Controlling the second circuit of the current control module to be turned on and the first circuit to be turned off, so as to control the current transmission direction to be opposite to the current output direction of the DC charging module;

[0024] The circuit between the DC charging module and the load circuit is controlled to be conductive, so as to form a charging loop between the DC charging module and the load power supply.

[0025] In some embodiments, the current control module is used to control the current transmission direction between the DC charging module and the power supply module, and a charging loop is formed between the DC charging module and the power supply module, including:

[0026] Controlling the first circuit of the current control module to be turned on and the second circuit to be turned off, and controlling the current transmission direction to be the same as the current transmission direction of the DC charging module;

[0027] The circuit between the DC charging module and the power supply module is controlled to be conductive, so as to form a charging loop between the DC charging module and the power supply module.

[0028] In some embodiments, after detecting that the temperature of the battery in the power supply module is less than a first threshold, the current control module controls the current transmission direction between the DC charging module and the power supply module, and forms a charging loop between the DC charging module and the power supply module, the method further includes:

[0029] When it is detected that the temperature of the battery is less than or equal to a second threshold, a heating circuit is controlled to be formed between the power supply module and the driving module of the power battery system; the second threshold is less than the first threshold;

[0030] When it is detected that the temperature of the battery is greater than or equal to a third threshold, the heating circuit is controlled to be disconnected; the third threshold is greater than the second threshold and less than the first threshold.

[0031] In some embodiments, after forming a charging loop between the DC charging module and the power supply module, the method further includes:

[0032] When it is detected that the temperature of the battery is greater than or equal to the first threshold, the circuit between the DC charging module and the load circuit is controlled to be disconnected, and the circuit between the DC charging module, the current control module and the power supply module is controlled to be connected.

[0033] In a fourth aspect, an embodiment of the present application provides a battery charging control device, the battery charging control device comprising:

[0034] A first control module, configured to control the current transmission direction between the DC charging module and the power supply module through the current control module when detecting that the temperature of the battery in the power supply module is lower than a first threshold, and to form a charging loop between the DC charging module and the power supply module;

[0035] The second control module is used to control the current transmission direction between the DC charging module and the power supply module through the current control module when it is detected that the temperature of the battery in the power supply module is greater than or equal to the first threshold, and form a charging loop between the DC charging module and the power supply module.

[0036] In a fifth aspect, an embodiment of the present application provides an electrical device, comprising the power battery system described in the first aspect.

[0037] In a sixth aspect, an embodiment of the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method described in the first aspect.

[0038] In a seventh aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, wherein the program is executed by a processor to implement the method described in the first aspect.

[0039] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation method of the present application is listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0041] Figure 1 A schematic diagram of the structure of an electric device for applying a power battery system provided by some embodiments of the present application;

[0042] Figure 2 A schematic diagram of the framework structure of a power battery system provided in some embodiments of the present application;

[0043] Figure 3 This is a schematic diagram of the specific structure of the power battery system in some embodiments of the present application;

[0044] Figure 4 Detailed structural diagrams of power battery systems in other embodiments of the present application;

[0045] Figure 5 This is a schematic diagram of the specific structure of the current control module in some embodiments of the present application;

[0046] Figure 6 Detailed structural diagram of the current control module in other embodiments of the present application

[0047] Figure 7 A flowchart of a battery charging control method provided in some embodiments of the present application;

[0048] Figure 8 A flowchart of a battery charging control method provided by other embodiments of the present application;

[0049] Fig. 9 A processing logic diagram of a battery charging control method provided in some embodiments of the present application;

[0050] Fig.10 A schematic diagram of the structure of a battery charging control device provided in some embodiments of the present application;

[0051] Fig.11 A schematic diagram of the structure of an electronic device provided in some embodiments of the present application is shown;

[0052] Fig.12 A schematic diagram of a storage medium provided in some embodiments of the present application is shown. DETAILED DESCRIPTION

[0053] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the embodiments of the present application; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present application; the terms "including" and "having" in the specification and claims of the present application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0055] In the description of the embodiments of the present application, “plurality” means more than two, unless otherwise clearly and specifically defined.

[0056] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0057] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0058] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0059] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0060] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0061] Although power battery systems have been widely used in new energy vehicles, it is well known that battery charging has always been an important constraint restricting the faster development of new energy vehicles. For power batteries, fast charging is still a technical difficulty that needs to be overcome by technicians in this field, especially charging batteries in low temperature environments (which can be understood as temperatures below 0°C). Since lithium precipitation is prone to occur when batteries are charged at low temperatures, it is often not possible to directly perform fast charging with a large current when charging the battery through a charging device in a low temperature environment. The battery needs to be heated first to a certain temperature (for example, greater than 0°C) before a large current is used to charge the battery.

[0062] In the related art, when charging an electric device (such as but not limited to electric vehicles) in a low temperature environment (temperature below 0°C), the battery needs to be heated by discharging a small current from the battery pack to the outside and by continuously operating the battery heating module (heating film or PTC). The battery can only be charged by the charging device after the battery pack temperature rises to a certain temperature. However, when the electric device is at a low temperature and low power (battery state of charge SOC is 5% to 10%), the battery pack can no longer continuously discharge to the outside due to the low temperature and low power, and the battery heating module cannot work. At this time, the battery heating module attached to the battery can only be powered through the AC charging interface and the on-board charger OBC. The battery heating module generates heat to heat the battery pack. Similarly, the battery pack temperature needs to rise to a certain temperature before the battery can be charged by the charging device.

[0063] As for the charging method of heating before charging, since the battery heating module is often a low-power device, a slow charging interface is required on the charging device, which is used to supply a small current to the battery heating module so that the battery heating module can heat the battery. If the electrical equipment does not have a slow charging interface, such as when a commercial electric vehicle only has a fast charging interface, only large current transmission can be performed. In a low-temperature and low-SOC environment, the entire vehicle will be unable to charge and cannot be used. In addition, when the battery is heated by the battery heating module, the DC charging module of the power battery system is connected to the charging device, and the battery is heated first. After the battery is heated, the current connection state is disconnected, and the DC charging module needs to be connected to the charging device again to quickly charge the battery. Before the battery is heated, personnel need to pay attention to the electrical equipment at all times to check whether the battery is heated successfully, which is inconvenient for users to use and travel.

[0064] In addition, by changing the communication protocol of the charging equipment, the charging equipment can have an auxiliary heating function and be able to recognize that the whole vehicle is charging and heating in a low temperature environment. However, this solution requires the development of new special charging equipment, and the current standard national standard charging protocol cannot be adopted. The charging protocol needs to be adjusted, and the existing charging equipment on the market cannot apply the new charging protocol. In addition, changing the communication protocol may also require corresponding electronic devices to assist and implement, and the cost is relatively high. Therefore, at present, there are still many technical and economic difficulties to overcome in order to realize the charging and heating process of the power battery in a low temperature environment by changing the communication protocol of the charging equipment.

[0065] Based on the above considerations, an embodiment of the present application proposes a power battery system, including a power supply module and a DC charging module, and also including a current control module and a load circuit. Among them, the DC charging module can be connected between the positive terminal and the negative terminal of the power supply module, and the load circuit can be connected between the positive terminal and the negative terminal of the DC charging module. The current control module can be arranged between the DC charging module and the power supply module to control the current transmission direction between the DC charging module and the power supply module, so as to control whether the DC charging module supplies power to the power supply module or to the load circuit, thereby forming a charging loop between the DC charging module, the load circuit and the power supply module.

[0066] By using the power battery system provided in this embodiment, when the battery temperature of the power supply module is low, the current transmission direction between the DC charging module and the power supply module can be controlled to be opposite to the current output direction of the DC charging module, that is, the current is transmitted from the positive end of the power supply module to the positive end of the DC charging module, and from the negative end of the DC charging module to the negative end of the power supply module. In this case, the DC charging module cannot charge the battery, but supplies power to the load circuit. When the battery temperature of the power supply module reaches a certain threshold, the battery can be charged normally, and the current transmission direction between the DC charging module and the power supply module can be controlled to be the same as the current output direction of the DC charging module, that is, the current is transmitted from the positive end of the DC charging module to the positive end of the power supply module, and from the negative end of the power supply module to the negative end of the DC charging module. In this case, the DC charging module can charge the battery. In this way, when the electrical equipment is in a low-temperature ground charge, after the DC charging module is connected to the charging device, the communication connection between the electrical equipment and the charging device can be maintained, and the battery can be heated before charging. After the battery is heated, there is no need to disconnect the DC charging module from the charging device and reconnect it. That is, after the battery is heated, there is no need to unplug the charging gun again, and there is no need for personnel to pay attention to the battery heating of the electrical equipment at all times, which is more convenient for users to use and travel. Moreover, the power battery system provided in the embodiment of the present application does not need to modify the communication protocol with the charging device, and can meet almost all charging devices that meet international standards on the existing market, and has great practicality and versatility.

[0067] It can be understood that the power battery system in the embodiments of the present application may only disclose the necessary structural features for realizing the embodiments of the present application. For other existing necessary structures, such as drive modules, circuit connection lines and other devices, if they are not mentioned in the embodiments of the present application, they can be regarded as implicitly disclosed.

[0068] The power battery system disclosed in the embodiment of the present application can be used in, but is not limited to, electric devices such as vehicles, ships or aircraft. The power system of the electric device can be composed of the power battery system disclosed in the embodiment of the present application. In this way, it is beneficial to improve the charging efficiency of the power battery system, reduce the charging time, further meet the fast charging requirements of the electric device, and thus improve the experience satisfaction of the user of the electric device.

[0069] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0070] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device in an embodiment of the present application.

[0071] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A power battery system is provided inside the vehicle 1000, and the power battery system includes a battery 100, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The power battery system may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0072] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0073] Please refer to Figure 2 , Figure 2A schematic diagram of the structure of a power battery system provided in some embodiments of the present application, such as Figure 2 As shown, the power battery system includes a power supply module, a DC charging module, a current control module and a load circuit. The DC charging module is connected between the positive terminal and the negative terminal of the power supply module, and the load circuit is connected between the positive terminal and the negative terminal of the DC charging module; the current control module is arranged between the DC charging module and the power supply module, and is used to control the current transmission direction between the DC charging module and the power supply module.

[0074] The power supply module may include batteries, a battery management system (BMS), and some control devices. The battery may be implemented as a power battery, including at least one battery pack, which may be a collection of multiple battery modules or a battery module including multiple cells. The battery management system may be connected to the vehicle control unit (VCU) to collect, process and store information during battery operation (such as voltage, temperature, power and current, etc.), and exchange information with external devices such as the vehicle control unit to ensure safe and reliable operation of the battery.

[0075] The above-mentioned control device can be arranged between the battery and the drive module, and the control device can be used to control the conduction and disconnection between the local circuits of the power battery system to realize the various functions of the power battery system, such as but not limited to the power supply function, the self-heating function, the preheating function, and the safety protection function of the circuit, etc. Specifically, the control device can include but is not limited to a high-voltage power distribution unit (PDU, Power Distribution Unit), a manual maintenance switch (MSD, Manual Service Disconnect), a bus capacitor, a passive discharge resistor, a high-voltage switch (including but not limited to relays and contactors, etc.), a pre-charge control component, a fuse, a voltage and / or current sensor, a high-voltage wiring harness, and a high-voltage connector, etc.

[0076] The pre-charge control component can be arranged on the positive busbar or negative busbar of the battery to control the power battery system to complete the high-voltage power-on process. Figure 3 As shown, taking the pre-charge control component set on the positive bus of the battery as an example, the pre-charge control component can be connected in parallel with the positive main control switch K3 on the positive bus, and specifically can include a pre-charge resistor and a pre-charge switch K4 connected in series. When high-voltage power-on is required, the pre-charge switch and the negative main control switch K5 on the negative bus can be controlled to be turned on, and the main control switch K3 on the positive bus can be turned off. When the voltage across the pre-charge resistor reaches the pre-charge voltage value, the pre-charge can be considered to be completed. Then the negative main control switch K5 on the negative bus can be controlled to be turned on, and the pre-charge switch K4 can be turned off to complete the high-voltage power-on process.

[0077] It can be understood that the present embodiment does not specifically limit the position of the main control switch and the pre-charge control component, that is, the pre-charge control component can also be set on the negative bus of the battery. When high-voltage power-on is required, the pre-charge switch K4 and the positive main control switch K3 on the positive bus can be controlled to be turned on, and the negative main control switch K5 on the negative bus can be turned off. When the voltage across the pre-charge resistor reaches the pre-charge voltage value, the pre-charge can be considered to be completed.

[0078] For the drive module, the drive module may include a motor and a motor controller, and a charge-discharge circuit for heating the battery may be formed between the power supply modules. Among them, the motor controller can be implemented using various types of switches. For example, it can be implemented by an inverter in a motor drive system, wherein the inverter can be implemented using a bridge arm circuit of an insulated gate bipolar transistor (IGBT). Specifically, the number of bridge arms of the bridge arm circuit is the same as the number of windings in the motor, and may be, but not limited to, three-phase, six-phase, etc. For example, the motor may include a three-phase motor, and the bridge arm circuit may include a three-phase bridge arm, which may include an A-phase bridge arm, a B-phase bridge arm, and a C-phase bridge arm, or may include a U-phase bridge arm, a V-phase bridge arm, and a W-phase bridge arm.

[0079] Among them, each phase bridge arm has an upper bridge arm and a lower bridge arm, and the upper bridge arm and the lower bridge arm are respectively provided with a switching unit, and both include a transistor and a diode connected in parallel. When the current passing through the bridge arm is greater than the conduction threshold of the diode, the diode can be reversely conducted, so that the transistor can be protected from overcurrent.

[0080] For the motor, it can include M-phase windings, multiple windings are connected in a common line, and have a common connection point, which can be called a neutral line, and the common connection point can be called a neutral point. And one end of each winding away from the neutral point is respectively connected to the connection point of the upper bridge arm and the lower bridge arm of a phase bridge arm. The battery pack, the M-phase bridge arm and the motor are connected in parallel, and the upper and lower bridge arm connection points of the M-phase bridge arm are respectively connected to the M-phase windings of the M-phase motor in a one-to-one correspondence.

[0081] It is understandable that the above motor is not limited to a three-phase motor, but can also be a six-phase or twelve-phase motor. Correspondingly, the motor controller can also include a six-phase bridge arm. The number of upper bridge arms and the number of lower bridge arms turned on each time can be the same or different, and this embodiment does not specifically limit this.

[0082] For the DC charging module, it can adapt to charging devices of different voltages and powers, and adapt the output voltage and power to the driving module. The current output by the DC charging module can be transmitted to the battery of the power supply module, thereby achieving the purpose of charging the battery. Specifically, the positive terminal of the DC charging module can be connected to the positive terminal bus of the battery, the negative terminal of the DC charging module can be connected to the negative terminal bus of the battery, and a first control switch K6 can be set between the positive terminal of the DC charging module and the positive terminal bus of the battery, and a second control switch K7 can be set between the negative terminal of the DC charging module and the negative terminal bus of the battery, so as to better control the charging circuit between the DC charging module and the power supply module.

[0083] For the current control module, it may include an analog circuit or a digital circuit, as long as it is arranged between the DC charging module and the power supply module and can control the current transmission direction between the DC charging module and the power supply module. Specifically, when the battery temperature is very low (for example, the temperature is less than 0°C) and cannot meet the charging requirements of the electrical equipment, the current transmission direction between the DC charging module and the power supply module can be controlled to be opposite to the current output direction of the DC charging module, that is, from the positive end of the power supply module to the positive end of the DC charging module, and from the negative end of the DC charging module to the negative end of the power supply module. At this time, the battery outputs current, so that there is a small current transmission between the DC charging module and the power supply module, and the battery and the electrical equipment can maintain communication, and the current transmission direction between the DC charging module and the power supply module is opposite to the current output direction of the DC charging module. Then the DC charging module cannot charge the power supply module, but supplies power to the load circuit. The battery in the load circuit is heated to generate heat, which can heat the battery. When the battery temperature meets the charging requirements of the electrical equipment (for example, the temperature is greater than 0°C), the current transmission direction between the DC charging module and the power supply module can be controlled to be the same as the current output direction of the DC charging module, that is, the current is transmitted from the positive end of the DC charging module to the positive end of the electrical module, and from the negative end of the power supply module to the negative end of the DC charging module. The DC charging module can charge the power supply module (at this time, the load circuit can still be powered if necessary).

[0084] Specifically, the current control module can be as follows Figure 3 As shown, it is set on the positive terminal bus of the battery, or it can be Figure 4 As shown, it is set on the negative terminal bus of the battery, as long as the current transmission direction between the DC charging module and the power supply module can be controlled.

[0085] In some embodiments, the current control module includes a first circuit and a second circuit connected in parallel. When the first circuit is turned on, a charging loop is formed between the DC charging module and the power supply module; when the second circuit is turned on, the DC charging module and the power supply module are unidirectionally connected, and the current conduction direction is opposite to the current transmission direction between the DC charging module and the load circuit. In this way, by setting two circuits in parallel, whether the DC charging module can supply power to the power supply module can be controlled by controlling the on-off state of the two circuits, that is, when the battery temperature is low and cannot meet the charging requirements, the first circuit is controlled to be disconnected, and the second circuit is turned on. At this time, the DC charging module supplies power to the load circuit and can heat the battery; and when the battery temperature reaches a certain threshold and meets the charging requirements, the first circuit can be controlled to be turned on. At this time, the DC charging module supplies power to the power supply module, and the low-temperature charging process of the DC charging module can be realized when the battery temperature is low.

[0086] Specifically, the first circuit may include a first switch, which is arranged between the same-direction electrode ends of the power supply module and the DC charging module. Thus, the first circuit can be turned on by controlling the first switch to be closed, and the current output by the DC charging module can be input to the power supply module.

[0087] The second circuit includes a controllable device, which is arranged between the same-direction electrode ends of the power supply module and the DC charging module, and controls the DC charging module and the power supply module to be unidirectionally conductive, and the current conduction direction is opposite to the current transmission direction between the DC charging module and the load circuit. In this way, the conduction of the second circuit can be achieved by controlling the controllable device to be closed, and the current output by the battery can be input into the DC charging module.

[0088] Furthermore, if Figure 5 As shown, the controllable device may include a diode and a second switch connected in series. In one embodiment, the positive terminal of the diode is connected to the positive terminal of the power supply module, and the negative terminal of the diode is connected to the positive terminal of the DC charging module. In another embodiment, Figure 6 As shown, the controllable device includes a diode and a second switch connected in series, the positive terminal of the diode is connected to the negative terminal of the DC charging module, and the negative terminal of the diode is connected to the negative terminal of the power supply module.

[0089] In this embodiment, a diode and a second switch connected in series can be used as controllable devices, wherein the second switch is used to control whether the second circuit is turned on, and the diode is used to control the conduction direction of the current. When the battery temperature meets the charging requirements, the second switch can be controlled to be disconnected to prevent the diode from being broken down by the high voltage of the DC charging module. When the battery temperature does not meet the charging requirements, the second switch can be controlled to be closed (the first switch is disconnected) so that the current between the DC charging module and the battery can only flow from the positive end of the battery to the positive end of the DC charging module, and from the positive end of the DC charging module to the positive end of the battery.

[0090] It is understandable that the application of the above-mentioned controllable device is only one implementation of the embodiment of the present application, and the present embodiment is not limited thereto. For example, it can also be implemented by a thyristor or other controllable device. In addition, the first circuit and the second circuit can also be set separately, one of the circuits is set on the positive terminal bus of the battery, and the other circuit is set on the negative terminal bus of the battery, as long as the two circuits can realize the control of the current transmission direction between the DC charging module and the power supply module.

[0091] For the load circuit, any electronic component that can be connected between the positive and negative ends of the DC charging module can be included, which can convert the electric energy transmitted by the DC charging module. In this embodiment, a battery heating module can be included, which is connected between the positive and negative ends of the DC charging module and is arranged near the battery in the power supply module for heating the battery. When the battery temperature is very low and cannot meet the charging requirements of the electrical equipment (for example, the temperature is greater than 0°C), the DC charging module can be controlled to charge the battery heating module first, and the battery heating works and generates heat, which can heat the battery. And the current between the power supply module and the DC charging module can only be transmitted from the power supply module to the DC charging module through the current control module, thereby preventing the large current output by the DC charging module from being input to the power supply module when the battery temperature is low, resulting in charging failure, and even lithium precipitation. In addition, since the DC charging module is supplying power to the load circuit, the communication connection between the charging device and the power battery and the electrical equipment can be maintained, and there is no need to reconnect after the heating is completed, that is, there is no need to plug and unplug the charging gun again, which is more convenient for users to use and travel.

[0092] Furthermore, a third control switch K8 may be provided between the positive terminal of the DC charging module and the battery heating module, and a fourth control switch K9 may be provided between the negative terminal of the DC charging module and the battery heating module, so as to better control the circuit between the DC charging module and the battery heating module and improve the overall safety and reliability of the power battery system and electrical equipment.

[0093] Specifically, the battery heating module can be one or both of a PTC (Positive Temperature Coefficient) device and a heating film. This embodiment does not specifically limit the specific material and structure of the battery heating module, as long as it can generate heat when doing work, it can heat the battery.

[0094] It should be noted that the load circuit may also include a heating system and a DC power conversion module (DC-DC converter, DCDC). The heating system may be arranged between the positive terminal and the negative terminal of the DC charging module. When the DC charging module is connected, the internal space of the electric device may be heated during battery heating and charging to increase the temperature of the internal space of the electric device, thereby further improving the user's satisfaction. The DC power conversion module may also be arranged between the positive terminal and the negative terminal of the DC charging module. When the DC charging module is connected, the DC power transmitted by the DC charging module may be converted into the voltage or current required by the load.

[0095] Furthermore, a fifth control switch K10 may be provided between the positive terminal of the DC charging module and the positive terminal of the heating system to better control the circuit between the DC charging module and the heating system and improve the overall safety and reliability of the power battery system and electrical equipment.

[0096] Based on the same concept as the above power battery system, this embodiment also provides a battery charging system, including a charging device and the above power battery system; the charging device is connected to a DC charging module.

[0097] It can be understood that the battery charging system provided in this embodiment includes a charging device and the above-mentioned power battery system, so it can at least achieve the beneficial effects that can be achieved by the above-mentioned power battery system, which will not be elaborated here.

[0098] Based on the same concept as the above-mentioned power battery system, this embodiment also provides a battery charging control method, which is applied to the above-mentioned power battery system. The execution subject of this embodiment can be any one of the motor controller and the vehicle controller, or it can be completed by the two controllers together, or it can be a specially set battery charging control device, or a domain controller. This embodiment does not make specific limitations on this. For ease of understanding, this embodiment can be specifically described by taking a battery charging control device as an example (the electric device takes a vehicle as an example). Figure 7 As shown, after detecting that the DC charging module is connected to the charging device, the method may include the following steps:

[0099] Step S10, when it is detected that the temperature of the battery in the power supply module is less than the first threshold, the current control module controls the current transmission direction between the DC charging module and the power supply module, and forms a charging loop between the DC charging module and the load circuit.

[0100] The first threshold value may be set according to the specific performance of the battery and may be set through a limited number of tests. For example, the lowest temperature at which the battery can be quickly charged using a charging device may be detected through tests, and the lowest temperature may be set as the first threshold value.

[0101] In practical applications, before charging the battery with a charging device, the battery charging control device can first check various parameters of the electric vehicle and the battery, such as battery temperature and power, whether the vehicle is faulty, etc. When it is detected that the temperature of the battery is less than the first threshold, the current control module can control the current transmission direction between the DC charging module and the power supply module to be opposite to the current output direction of the DC charging module, that is, the positive terminal of the power supply module is transmitted to the positive terminal of the DC charging module, so that there is current between the DC charging module and the power supply module, and the electric device and the battery and the whole vehicle can communicate and connect, but the DC power supply module cannot supply power to the power supply module, but forms a charging loop with the load circuit to supply power to the load circuit.

[0102] For a current control module including a first circuit and a second circuit, the above-mentioned step of controlling the current transmission direction between the DC charging module and the power supply module through the current control module and forming a charging loop between the DC charging module and the load circuit may include the following processing: controlling the second circuit of the current control module to be turned on and the first circuit to be turned off, and controlling the current transmission direction to be opposite to the current output direction of the DC charging module; controlling the circuit between the DC charging module and the load circuit to be turned on, and forming a charging loop between the DC charging module and the load power supply.

[0103] In this embodiment, the second circuit of the control current control module is turned on, and the first circuit is turned off, so that the current transmission direction between the DC charging module and the power supply module can be controlled to be opposite to the current output direction of the DC charging module, that is, the positive terminal of the power supply module is transmitted to the positive terminal of the DC charging module. In this way, there is current between the DC charging module and the power supply module, and the electrical equipment and the battery and the whole vehicle can communicate and connect, but the current direction is opposite to the current output direction of the DC power supply module, so the DC charging module cannot supply power to the power supply module. The circuit between the DC charging module and the load circuit can be controlled to be turned on to form a charging loop between the DC charging module and the load power supply, so that the current output by the DC charging module is transmitted to the load circuit, so that the DC charging can work normally without charging the battery.

[0104] Step S20, when it is detected that the temperature of the battery in the power supply module is greater than or equal to the first threshold, the current control module controls the current transmission direction between the DC charging module and the power supply module, and forms a charging loop between the DC charging module and the power supply module.

[0105] In actual applications, when it is detected that the temperature of the battery is greater than or equal to the first threshold, the current control module can be used to control the current transmission direction between the DC charging module and the power supply module to be the same as the current output direction of the DC charging module, that is, the positive end of the DC charging module is transmitted to the positive end of the power supply module, so that the DC charging module can supply power to the power supply module to quickly charge the battery.

[0106] For a current control module including a first circuit and a second circuit, the above-mentioned step of controlling the current transmission direction between the DC charging module and the power supply module through the current control module and forming a charging loop between the DC charging module and the power supply module may include the following steps: controlling the first circuit of the current control module to be turned on and the second circuit to be turned off, and controlling the current transmission direction to be the same as the current transmission direction of the DC charging module; controlling the circuit between the DC charging module and the power supply module to be turned on, and forming a charging loop between the DC charging module and the power supply module.

[0107] In this embodiment, the first circuit of the control current control module is turned on, and the second circuit is turned off, so that the current transmission direction between the DC charging module and the power supply module can be controlled to be the same as the current output direction of the DC charging module, that is, from the positive terminal of the DC charging module to the positive terminal of the power supply module. In this way, a large current can be transmitted between the DC charging module and the power supply module, and the DC charging module can supply power to the power supply module.

[0108] In one embodiment, if Figure 8 As shown, after the above step S10, the battery charging control method may further include the following steps: step S30, when it is detected that the temperature of the battery is less than or equal to the second threshold, a heating circuit is controlled to be formed between the power supply module and the driving module of the power battery system; the second threshold is less than the first threshold; step S40, when it is detected that the temperature of the battery is greater than or equal to the third threshold, the heating circuit is controlled to be disconnected; the third threshold is greater than the second threshold and less than the first threshold.

[0109] The second threshold and the third threshold can be set with reference to the first threshold, that is, they can be set through a limited number of tests. For example, through testing, it can be detected that the battery temperature is lower, and when the heating is slow only by using the battery heating module, the battery self-heating function can be started, and the motor controller of the drive module can be controlled to be turned on, so that a cyclic charging and discharging circuit is formed between the battery and the motor to speed up the battery heating speed, and then the lower battery temperature can be set as the second threshold. The same principle can be used to set the above third threshold.

[0110] In this embodiment, when the battery temperature is very low (such as the battery temperature ≤ -10°C), it may take a relatively long time to heat the battery only by the battery heating module. In order to shorten the battery heating time, a heating circuit can be controlled to form between the power supply module and the drive module of the power battery system to speed up the battery heating time. When the battery temperature is greater than or equal to the third threshold, the heating circuit can be controlled to disconnect so that the battery no longer outputs current, in preparation for fast charging.

[0111] Furthermore, after the above step S40, the battery charging control method may further include step S50, in which, when it is detected that the temperature of the battery is greater than or equal to the first threshold, the circuit between the DC charging module and the load circuit is controlled to be disconnected, and the circuit between the DC charging module, the current control module and the power supply module is controlled to be connected. In this way, the circuit between the DC charging module and the load circuit is disconnected, so that the current output by the DC charging module basically flows into the battery, thereby quickly charging the battery.

[0112] In addition, it is also possible to disconnect only part of the circuit between the load circuit and the DC charging module, for example, keep the circuit between the heater system and the DC charging module conductive, so that the DC charging module can continue to supply power to the heater system. After charging is completed, when the user gets in the car, the temperature inside the car is more suitable, which can further improve the user's satisfaction with the car.

[0113] In some embodiments, the battery charging control method is described in detail by taking the vehicle as an electrical device. Based on the charging control method provided in this embodiment, the charging device (such as but not limited to the electrical device) can output high voltage electricity normally under low temperature and low SOC to heat the battery pack of the whole vehicle, supply DCDC power, operate the heating system, and other electrical devices, and at the same time, the pulse heating function can be turned on. Specific control methods, such as Fig. 9 As shown, the battery charging control may include the following steps:

[0114] 001) The vehicle is in a stationary state, and the user operates the charging device to insert the fast charging gun of the power-consuming device into the fast charging port of the vehicle;

[0115] 002) After the vehicle detects that the charging gun is connected, if the vehicle is in a power-off state, the battery management system (BMS or domain controller) and the switch control module (BMS, PDU or domain controller) are awakened to perform a self-check; if the vehicle is already in a high-voltage state, the current state is maintained, but it is necessary to ensure that the vehicle is in an inoperable state; at the same time, the charging device detects that the charging gun is connected to the vehicle and performs a self-check of the electrical equipment.

[0116] 003) After the vehicle and charging equipment self-check is completed, the battery management system detects whether the battery temperature meets the charging requirements. If so, step 004) is executed; if not, step 005) is executed;

[0117] 004) The switch control module sequentially closes the first switch K1 in the current control module and the negative main control switch K5, the second control switch K7, and the first control switch K6 of the switch module;

[0118] 005) The communication and interaction between the battery management system and the DC power-consuming equipment is completed;

[0119] 006) Enter the normal fast charging state;

[0120] 007) Figure 1 As shown, the switch control module sequentially closes the second switch K2 in the current control module and the second control switch K7, the fourth control switch K9, the third control switch K8, the negative electrode main control switch K5, the fifth control switch K10, and the first control switch K6 of the switch module, and enters the low-temperature charging mode, and the battery pack outputs voltage to the outside; the charging device detects that the error range between the battery pack terminal voltage and the battery voltage of the CAN communication message is ≤±5% (indicating that the battery pack and the vehicle are fault-free), and is greater than the minimum output voltage of the power-consuming device and less than the maximum output voltage of the power-consuming device, and then closes the switch in the charging device, so that the charging device can output current to the outside, and the DC power supply circuit is turned on;

[0121] 008) After the battery management system and the DC power-consuming device have completed communication, the charging voltage and current T1 (calibrable) are requested according to the power of the battery heating module, DCDC, heating system and other electrical appliances. After receiving the requested charging voltage and current, the charging device adjusts the voltage and current output;

[0122] 009) After the electrical equipment is output, the battery heating module, DCDC, heating system and other electrical appliances are powered and work normally;

[0123] 010) Determine whether to start the pulse heating function according to the current battery temperature. If the battery temperature is ≤-10°C (calibrable), if yes, proceed to step 011), if no, proceed to step 010);

[0124] 011) The vehicle closes the pre-charge control switch K4 in the switch module for pre-charging. After the pre-charging is completed, the positive main control switch K3 is closed, and then the pre-charge control switch K4 is disconnected to complete the high voltage application;

[0125] 012) Turn on the pulse heating function and enter the pulse heating process;

[0126] 013) When the battery management system detects that the battery temperature rises to the set temperature T1, pulse heating stops.

[0127] 014) After the battery heating module continues to heat for a period of time, when the battery management system detects that the battery temperature rises to the set temperature T2, the battery heating module, DCDC, heating system and other electrical appliances are stopped, and the requested charging current is reduced to I2 = 0 (calibrable);

[0128] 015) The switch control module closes the first switch K1 in the current control module and disconnects the second switch K2; then disconnects the third control switch K8 and the fourth control switch K9 to stop heating, and finally disconnects the positive electrode main control switch K3, and keeps the first control switch K6, the second control switch K7, the fifth control switch K10 and the negative electrode main control switch K5 closed;

[0129] 016) The battery management system requests the charging device to output a charging current I3 according to the current allowable charging current of the battery, and then enters step 006).

[0130] It can be understood that the above description of the various embodiments tends to emphasize the differences between the various embodiments, and the same or similar points can be referenced to each other. For the sake of brevity, they will not be repeated herein.

[0131] In summary, the battery charging control method provided in the embodiment of the present application, when the battery temperature of the power supply module is low and less than the first threshold, controls the current transmission direction between the DC charging module and the power supply module to be opposite to the current output direction of the DC charging module, that is, from the positive end of the power supply module to the positive end of the DC charging module, and from the negative end of the DC charging module to the negative end of the power supply module, then the DC charging module can maintain the current transmission between the DC charging module, so that the charging device and the power-consuming device and the battery can communicate, but the DC charging module cannot charge the battery, but supplies power to the load circuit. When the battery temperature of the power supply module reaches the first threshold, the current transmission direction between the DC charging module and the power supply module can be controlled to be consistent with the current output direction of the DC charging module, that is, from the positive end of the DC charging module to the positive end of the power supply module, then the DC charging module can charge the battery. In this way, when the electrical equipment is in a low-temperature ground charge, after the DC charging module is connected to the charging device, the communication connection between the electrical equipment and the charging device can be maintained, and the battery can be heated before charging; after the battery is heated, there is no need to disconnect the DC charging module from the charging device and reconnect it, that is, after the battery is heated, there is no need to unplug the charging gun again, and there is no need for personnel to pay attention to the battery heating of the electrical equipment at all times, which is more convenient for users to use and travel. Moreover, the power battery system provided in the embodiment of the present application does not need to modify the communication protocol with the charging device, and can meet almost all charging devices that meet international standards on the existing market, and has great practicality and versatility.

[0132] Based on the same concept as the above-mentioned battery charging control method, the embodiment of the present application also provides a battery charging control device for implementing the above-mentioned battery charging control method, such as Fig.10 As shown, the device comprises:

[0133] A first control module, configured to control the current transmission direction between the DC charging module and the power supply module through the current control module when detecting that the temperature of the battery in the power supply module is lower than a first threshold, and to form a charging loop between the DC charging module and the power supply module;

[0134] The second control module is used to control the current transmission direction between the DC charging module and the power supply module through the current control module when it is detected that the temperature of the battery in the power supply module is greater than or equal to the first threshold, and form a charging loop between the DC charging module and the power supply module.

[0135] It can be understood that the battery charging control device provided in this embodiment is used to execute the above-mentioned battery charging control method, so it can at least achieve the beneficial effects that can be achieved by the above-mentioned battery charging control method, which will not be described in detail here.

[0136] The present application also provides an electronic device to execute the above-mentioned battery charging control method. Fig.11 , which shows a schematic diagram of an electronic device provided by some embodiments of the present application. Fig.11 As shown, the electronic device 8 includes: a processor 800, a memory 801, a bus 802 and a communication interface 803, and the processor 800, the communication interface 803 and the memory 801 are connected via the bus 802; the memory 801 stores a computer program that can be run on the processor 800, and when the processor 800 runs the computer program, it executes the battery charging control method provided in any of the aforementioned embodiments of the present application.

[0137] The memory 801 may include a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one disk storage. The communication connection between the device network element and at least one other network element is realized through at least one communication interface 803 (which may be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network, etc. may be used.

[0138] The bus 802 may be an ISA bus, a PCI bus, or an EISA bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory 801 is used to store programs, and the processor 800 executes the program after receiving an execution instruction. The battery charging control method disclosed in any implementation of the aforementioned embodiment of the present application may be applied to the processor 800, or implemented by the processor 800.

[0139] The processor 800 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the processor 800. The above processor 800 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a readily available programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application can be directly embodied as a hardware decoding processor to be executed, or the hardware and software modules in the decoding processor can be executed. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 801, and the processor 800 reads the information in the memory 801 and completes the steps of the above method in combination with its hardware.

[0140] The electronic device provided in the embodiment of the present application and the battery charging control method provided in the embodiment of the present application are based on the same inventive concept and have the same beneficial effects as the methods adopted, operated or implemented therein.

[0141] The present application also provides a computer-readable storage medium corresponding to the battery charging control method provided in the above embodiment. Fig.12 The computer-readable storage medium shown is a CD 30 on which a computer program (ie, a program product) is stored. When the computer program is run by a processor, the battery charging control method provided in any of the aforementioned embodiments will be executed.

[0142] It should be noted that examples of computer-readable storage media may also include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other optical or magnetic storage media, which are not listed here one by one.

[0143] The computer-readable storage medium provided in the embodiment of the present application and the battery charging control method provided in the embodiment of the present application are based on the same inventive concept and have the same beneficial effects as the method adopted, run or implemented by the application program stored therein.

[0144] The embodiment of the present application further provides a computer program product corresponding to the battery charging control method provided in the aforementioned embodiment, including a computer program, which is executed by a processor to implement the aforementioned battery charging control method.

[0145] The computer program product provided in the embodiment of the present application is based on the same inventive concept as the battery charging control method provided in the embodiment of the present application, and has the same beneficial effects as the method implemented by executing the computer program thereof by a processor.

[0146] It can be understood by those skilled in the art that in the above method of the specific embodiment, the order of writing each step does not mean a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic. (Method embodiment)

[0147] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A power battery system, characterized in that: include: A power supply module, a DC charging module, a current control module and a load circuit, wherein the DC charging module is connected between the positive terminal and the negative terminal of the power supply module, and the load circuit is connected between the positive terminal and the negative terminal of the DC charging module; The current control module is disposed between the DC charging module and the power supply module, and is used to control the current transmission direction between the DC charging module and the power supply module.

2. The power battery system according to claim 1, characterized in that: The current control module includes a first circuit and a second circuit connected in parallel, and when the first circuit is turned on, a charging loop is formed between the DC charging module and the power supply module; When the second circuit is turned on, the DC charging module and the power supply module are unidirectionally conductive, and the current conduction direction is opposite to the current output direction of the DC charging module.

3. The power battery system according to claim 2, characterized in that: The first circuit includes a first switch, and the first switch is arranged between the power supply module and the same-direction electrode terminal of the DC charging module.

4. The power battery system according to claim 2, characterized in that: The second circuit includes a controllable device, which is arranged between the same-direction electrode ends of the power supply module and the DC charging module, and controls the DC charging module and the power supply module to be unidirectionally conductive, and the current conduction direction is opposite to the current output direction of the DC charging module.

5. The power battery system according to claim 4, characterized in that: The controllable device includes a diode and a second switch connected in series, the positive terminal of the diode is connected to the positive terminal of the power supply module, and the negative terminal of the diode is connected to the positive terminal of the DC charging module.

6. The power battery system according to claim 4, characterized in that: The controllable device includes a diode and a second switch connected in series, the positive terminal of the diode is connected to the negative terminal of the DC charging module, and the negative terminal of the diode is connected to the negative terminal of the power supply module.

7. The power battery system according to any one of claims 1 to 6, characterized in that: The load circuit includes a battery heating module, which is connected between the positive terminal and the negative terminal of the DC charging module and is arranged near the battery in the power supply module for heating the battery.

8. The power battery system according to any one of claims 1 to 6, characterized in that: The load circuit also includes a heating system, which is arranged between the positive terminal and the negative terminal of the DC charging module.

9. A battery charging system, characterized in that: It comprises a charging device and the power battery system according to any one of claims 1 to 8; the charging device is connected to the DC charging module.

10. A battery charging control method, characterized in that: Applied to the power battery system according to any one of claims 1 to 8, the method comprising: When it is detected that the temperature of the battery in the power supply module is less than a first threshold, the current control module controls the current transmission direction between the DC charging module and the power supply module, and forms a charging loop between the DC charging module and the load circuit; When it is detected that the temperature of the battery in the power supply module is greater than or equal to the first threshold, the current transmission direction between the DC charging module and the power supply module is controlled by the current control module to form a charging loop between the DC charging module and the power supply module.

11. The method according to claim 10, characterized in that The power battery system according to any one of claims 2 to 8; the current control module controls the current transmission direction between the DC charging module and the power supply module, and forms a charging loop between the DC charging module and the load circuit, comprising: Controlling the second circuit of the current control module to be turned on and the first circuit to be turned off, so as to control the current transmission direction to be opposite to the current output direction of the DC charging module; The circuit between the DC charging module and the load circuit is controlled to be conductive, so as to form a charging loop between the DC charging module and the load power supply.

12. The method according to claim 10, characterized in that The power battery system according to any one of claims 2 to 8; the current control module controls the current transmission direction between the DC charging module and the power supply module, and forms a charging loop between the DC charging module and the power supply module, comprising: Controlling the first circuit of the current control module to be turned on and the second circuit to be turned off, and controlling the current transmission direction to be the same as the current transmission direction of the DC charging module; The circuit between the DC charging module and the power supply module is controlled to be conductive, so as to form a charging loop between the DC charging module and the power supply module.

13. The method according to any one of claims 10 to 12, characterized in that: After it is detected that the temperature of the battery in the power supply module is less than the first threshold, the current transmission direction between the DC charging module and the power supply module is controlled by the current control module, and a charging loop is formed between the DC charging module and the power supply module, the method further includes: When it is detected that the temperature of the battery is less than or equal to a second threshold, a heating circuit is controlled to be formed between the power supply module and the driving module of the power battery system; the second threshold is less than the first threshold; When it is detected that the temperature of the battery is greater than or equal to a third threshold, the heating circuit is controlled to be disconnected; the third threshold is greater than the second threshold and less than the first threshold.

14. The method according to claim 12 or 13, characterized in that After forming the charging loop between the DC charging module and the power supply module, the method further includes: When it is detected that the temperature of the battery is greater than or equal to the first threshold, the circuit between the DC charging module and the load circuit is controlled to be disconnected, and the circuit between the DC charging module, the current control module and the power supply module is controlled to be connected.

15. A battery charging control device, characterized in that: The device comprises: A first control module, configured to control the current transmission direction between the DC charging module and the power supply module through the current control module when detecting that the temperature of the battery in the power supply module is lower than a first threshold, and to form a charging loop between the DC charging module and the power supply module; The second control module is used to control the current transmission direction between the DC charging module and the power supply module through the current control module when it is detected that the temperature of the battery in the power supply module is greater than or equal to the first threshold, and form a charging loop between the DC charging module and the power supply module.

16. An electrical equipment, characterized in that: A power battery system comprising any one of claims 1 to 8.

17. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: The processor runs the computer program to implement the method according to any one of claims 10-14.

18. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the method according to any one of claims 10 to 14.

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