Battery control circuit, battery system, power-consuming device, and battery charging control method

Abstract

The present application provides a battery control circuit, a battery system, an electrical device, and a battery charging control method, which belong to the field of battery technology. The battery control circuit includes: a first module connected to a battery, the first module including a switching circuit and a first energy storage circuit connected to the switching circuit, and the battery includes two battery packs connected to each other; a controller configured to: obtain the voltage of the battery pack during charging, and in response to the voltage of at least one battery pack being greater than a first threshold, control the battery to switch from a charging state to a first state through the first module, and the first state includes: executing mutual discharge of the two battery packs through the first module. The battery control circuit of the present application can improve the charging efficiency of the battery.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery control circuit, a battery system, an electrical device, and a battery charging control method. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] During the battery charging or discharging process, polarization occurs due to the chemical reactions inside the battery and the influence of current movement. This polarization phenomenon may cause the battery energy density to decrease, charging time to increase, and battery charging efficiency to decrease. Summary of the Invention

[0004] The present application aims to solve at least one of the technical problems existing in the background art. To this end, one purpose of the present application is to provide a battery control circuit, a battery system, an electrical device, and a battery charging control method to solve the problem of low battery charging efficiency in the related art.

[0005] An embodiment of the first aspect of the present application provides a battery control circuit, comprising: a first module, connected to a battery, the first module comprising a switching circuit and a first energy storage circuit connected to the switching circuit, the battery comprising two battery packs connected to each other; a controller, configured to: obtain the voltage of the battery pack during charging, and in response to the voltage of at least one battery pack being greater than a first threshold, control the battery to switch from a charging state to a first state through the first module, the first state comprising: executing mutual discharge of the two battery packs through the first module.

[0006] In the technical solution of the embodiment of the present application, when the voltage of the battery pack is greater than the first threshold, the polarization voltage of the battery pack may be large, resulting in a more serious polarization phenomenon. Therefore, in response to the voltage of at least one battery pack being greater than the first threshold, the two battery packs are discharged from each other through the first module, thereby realizing the discharge of the battery pack whose voltage is greater than the first threshold. During the discharge process, the polarization voltage of the battery pack can be reduced, thereby improving the polarization phenomenon of the battery, so that high current charging of the battery can be maintained and the charging efficiency of the battery can be improved. At the same time, since the two battery packs discharge each other, energy is transferred between the two battery packs, so that the power of the two battery packs after mutual discharge is consistent or basically consistent with the power before mutual discharge, thereby improving the problem of power loss due to excessive discharge of any of the battery packs, and helping to improve the charging efficiency of the battery pack.

[0007] In some embodiments, one of the two battery packs whose voltage is greater than a first threshold is designated as a first battery pack, and the remaining battery pack is designated as a second battery pack. The controller is further configured to: in a first state, repeatedly perform N1 times of discharging the first battery pack into the first energy storage circuit and then discharging the first energy storage circuit into the second battery pack via the switch circuit, where N1 is an integer greater than 1; and / or, in the first state, repeatedly perform N2 times of discharging the second battery pack into the first energy storage circuit and then discharging the first energy storage circuit into the first battery pack via the switch circuit, where N2 is an integer greater than 1. In this way, the first state can be maintained for a longer period of time, thereby enhancing the discharge of the first battery pack and thereby enhancing the depolarization effect on the first battery pack.

[0008] In some embodiments, the positive and negative electrodes of the batteries are further connected to an external charging device, and the negative electrodes of the two battery packs are connected. The switching circuit includes: a first switch, the first switch connecting the positive electrodes of the two battery packs; a first bridge arm, the ends of the first bridge arm connecting the positive and negative electrodes of one of the battery packs, the midpoint of the first bridge arm connecting to the first end of the first energy storage circuit; a second bridge arm, the ends of the second bridge arm connecting the positive and negative electrodes of the other battery pack, the second end of the first energy storage circuit connecting to the midpoint of the second bridge arm. The controller is further configured to: in response to the voltage of both battery packs being less than or equal to a first threshold, control the first switch to close, so that the charging device charges the batteries; in response to the voltage of the battery packs being greater than the first threshold during charging, control the first switch to open, and place the batteries in a first state via the first bridge arm, the second bridge arm, and the first energy storage circuit. When the voltage of both battery packs is less than the first threshold, there is no polarization or only weak polarization between the first and second battery packs, and the battery charging efficiency is high. During charging, the first switch is closed, the two battery packs are connected in parallel, and the voltages of the two battery packs are consistent. When it is detected that the voltage of either battery pack is greater than a first threshold, the first switch is disconnected, meaning that the two battery packs are no longer connected in parallel. This allows the two battery packs to form separate charge and discharge circuits via the first bridge arm and the second bridge arm, respectively, thereby depolarizing the battery. In other words, switching the first switch on and off enables switching between the battery's charging state and the first state.

[0009] In some embodiments, the two battery packs include: a first group and a second group, the first bridge arm includes: a first upper bridge arm and a first lower bridge arm, the first upper bridge arm and the first lower bridge arm are respectively connected to the positive electrode and the negative electrode of the first group, the second bridge arm includes: a second upper bridge arm and a second lower bridge arm, the second upper bridge arm and the second lower arm are respectively connected to the positive electrode and the negative electrode of the second group, and the controller is configured to: alternately perform the first operation and the second operation so that the first group discharges to the first energy storage circuit and the first energy storage circuit discharges to the second group; alternately perform the third operation and the fourth operation so that The second group discharges into the first energy tank circuit, and the first energy tank circuit discharges into the first group. The first operation includes: controlling the first upper bridge arm and the second lower bridge arm to conduct, and the first lower bridge arm and the second upper bridge arm to shut down; the second operation includes: controlling the first upper bridge arm and the second upper bridge arm to conduct, and the first lower bridge arm and the second lower arm to shut down; the third operation includes: controlling the first lower bridge arm and the second upper bridge arm to conduct, and the first upper bridge arm and the second lower arm to shut down; and the fourth operation includes: controlling the first upper bridge arm and the second upper bridge arm to conduct, and the first lower bridge arm and the second lower arm to shut down. In this way, during the process of the first energy tank circuit discharging into the second group, the first energy tank circuit, the first group, and the second group can form a loop, allowing the first group to continuously discharge into the first energy tank circuit, further enhancing the depolarization effect on the first group. Furthermore, the voltage after the first group and the first energy tank circuit are connected in series can be greater than the voltage of the second group, thereby increasing the success rate of the first energy tank circuit discharging into the second group. Similarly, during the process of the first energy storage circuit discharging to the first group, the first energy storage circuit, the first group and the second group can form a loop, and the second group can continue to discharge to the first energy storage circuit, thereby improving the success rate of the first energy storage circuit discharging the first group smoothly and improving the depolarization effect on the second group.

[0010] In some embodiments, the first module further includes a second energy storage circuit connected in parallel to both ends of the first bridge arm. The controller is further configured to, in a first state, execute, through a switching circuit, discharge from one of the two battery packs whose voltage is greater than a first threshold to the second energy storage circuit, and discharge from the second energy storage circuit to the remaining battery pack. The second energy storage circuit can also enable discharge from the battery pack whose voltage is greater than the first threshold to the other battery pack, thereby enhancing the discharge efficiency of the battery pack and improving the depolarization effect in the first state.

[0011] In some embodiments, the two battery packs include: a first group and a second group, the first group being connected to the first bridge arm, and the controller being further configured to: in a first state, simultaneously execute, through a switching circuit, the first group discharging into the first energy storage circuit and the first group discharging into the second energy storage circuit, as well as simultaneously execute, through a switching circuit, the first energy storage circuit discharging into the second group and the second energy storage circuit discharging into the second group; and / or in the first state, simultaneously execute, through a switching circuit, the second group discharging into the first energy storage circuit and the first group discharging into the second energy storage circuit, as well as simultaneously execute, through a switching circuit, the first energy storage circuit discharging into the first group and the second energy storage circuit discharging into the first group. In other words, the first group can simultaneously discharge the second group through the first energy storage circuit and the second energy storage circuit, and / or, while the second group is discharging the first group through the first energy storage circuit, the first group can exchange energy with the second energy storage circuit, thereby increasing the discharge amount of the first group in a short period of time, improving the discharge efficiency of the first group, and thereby further improving the depolarization effect in the first state.

[0012] In some embodiments, the first energy storage circuit includes at least one inductor, and the second energy storage circuit includes a capacitor. The inductor can store a large amount of electricity, which can improve the efficiency of energy transfer between battery packs, thereby achieving a better depolarization effect on the battery. The capacitor has a small size and can achieve rapid charging and discharging. While further improving the depolarization effect on the battery, it also maintains a small size of the battery control circuit, reducing the weight of the battery control circuit and lowering its cost.

[0013] In some embodiments, the positive and negative electrodes of the battery are further connected to an external charging device, respectively. The two battery packs are connected in series, and the switching circuit includes a first bridge arm, wherein the first end of the first bridge arm is connected to the positive electrode of the battery and the second end is connected to the negative electrode of the battery. The midpoint of the first bridge arm is connected to the first end of the first energy storage circuit, and the second end of the first energy storage circuit is connected between the two battery packs. The controller is further configured to: in response to the voltage of both battery packs being less than or equal to a first threshold, control the charging device to charge the battery; in response to the voltage of at least one of the two battery packs being greater than the first threshold, place the battery in a first state via the first bridge arm and the first energy storage circuit. The first bridge arm enables the two battery packs to form a charging and discharging circuit with the first energy storage circuit, thereby depolarizing the series-connected batteries.

[0014] In some embodiments, the first module further includes a second energy storage circuit connected in parallel across the battery. The controller is further configured to, in a first state, cause any one of the two battery packs whose voltage is greater than a first threshold to discharge to the second energy storage circuit, and the second energy storage circuit to discharge to the remaining battery pack, via the first bridge arm. The second energy storage circuit can also enable the battery pack whose voltage is greater than the first threshold to discharge to the other battery pack, thereby enhancing the discharge efficiency of the battery pack and improving the depolarization effect in the first state.

[0015] In some embodiments, any one of the two battery packs whose voltage is greater than a first threshold is recorded as a first battery pack, and the remaining battery pack is recorded as a second battery pack. The controller is further configured to: simultaneously execute, through the first bridge arm, discharge of the first battery pack to the first energy storage circuit and discharge of the second energy storage circuit to the second battery pack, and simultaneously execute discharge of the first energy storage circuit to the second battery pack and discharge of the first battery pack to the second energy storage circuit. In other words, the first battery pack can simultaneously discharge the second battery pack through the first energy storage circuit and the second energy storage circuit, which can increase the discharge amount of the first battery pack in a short period of time, further improve the discharge efficiency of the first battery pack, and thus further improve the depolarization effect in the first state.

[0016] An embodiment of the second aspect of the present application provides a battery system, which includes the battery control circuit in the above embodiment.

[0017] An embodiment of the third aspect of the present application provides an electrical device, which includes the battery system in the above embodiment, and the battery system is used to provide electrical energy.

[0018] The fourth embodiment of the present application provides a battery charging control method, wherein the battery includes two battery packs connected to each other, the battery being connected to a first module, the first module including a switching circuit and a first energy storage circuit connected to the switching circuit, the method comprising: obtaining the voltage of the battery pack during charging; in response to the voltage of at least one battery pack being greater than a first threshold, controlling the battery to switch from a charging state to a first state via the first module, the first state comprising: executing, via the first module, the discharge of the two battery packs from each other. In this way, the discharge of the battery pack having a voltage greater than the first threshold can be achieved, the polarization voltage of the battery pack can be reduced, and the polarization phenomenon of the battery pack can be improved, thereby maintaining high current charging of the battery and improving the charging efficiency of the battery.

[0019] In some embodiments, any one of the two battery packs whose voltage is greater than a first threshold is designated as a first battery pack, and the remaining battery pack is designated as a second battery pack. The first state further comprises: repeating N1 times the operation of discharging the first battery pack into the first energy storage circuit and then discharging the first energy storage circuit into the second battery pack, where N1 is an integer greater than 1; and / or repeating N2 times the operation of discharging the second battery pack into the first energy storage circuit and then discharging the first energy storage circuit into the first battery pack, where N2 is an integer greater than 1. In this way, the first state can be maintained for a longer period of time, enhancing the discharge of any one of the battery packs whose voltage is greater than the first threshold, thereby enhancing the depolarization effect on the first battery pack.

[0020] In some embodiments, the positive and negative electrodes of the batteries are further connected to an external charging device, and the negative electrodes of the two battery packs are connected. The switching circuit includes: a first switch connected to the positive electrodes of the two battery packs; a first bridge arm, the ends of the first bridge arm connected to the positive and negative electrodes of one of the battery packs, the midpoint of the first bridge arm connected to the first end of the first energy storage circuit; and a second bridge arm, the ends of the second bridge arm connected to the positive and negative electrodes of the other battery pack, the second end of the first energy storage circuit connected to the midpoint of the second bridge arm. The method further includes: in response to the voltage of both battery packs being less than or equal to a first threshold, controlling the first switch to close so that the charging device charges the battery; in response to the voltage of the battery pack being greater than the first threshold during charging, controlling the first switch to open, and placing the battery in a first state via the first bridge arm, the second bridge arm, and the first energy storage circuit. When it is detected that the voltage of either battery pack is greater than the first threshold, the first switch is opened, allowing the two battery packs to form a charging and discharging circuit respectively via the first bridge arm and the second bridge arm, thereby depolarizing the battery. In this way, switching the battery between the charging state and the first state can be achieved by turning the first switch on and off.

[0021] In some embodiments, the two battery packs include: a first group and a second group, the first bridge arm includes: a first upper bridge arm and a first lower bridge arm, the first upper bridge arm and the first lower bridge arm are respectively connected to the positive electrode and the negative electrode of the first group, the second bridge arm includes: a second upper bridge arm and a second lower bridge arm, the second upper bridge arm and the second lower bridge arm are respectively connected to the positive electrode and the negative electrode of the second group; the first state includes: alternately performing the first operation and the second operation so that the first group discharges to the first energy storage circuit and the first energy storage circuit discharges to the second group; alternately performing the third operation and the fourth operation so that The second group discharges into the first energy tank circuit, and the first energy tank circuit discharges into the first group. The first operation includes: controlling the first upper bridge arm and the second lower bridge arm to be conductive, and the first lower bridge arm and the second upper bridge arm to be disconnected; the second operation includes: controlling the first upper bridge arm and the second upper bridge arm to be conductive, and the first lower bridge arm and the second lower bridge arm to be disconnected; the third operation includes: controlling the first lower bridge arm and the second upper bridge arm to be conductive, and the first upper bridge arm and the second lower bridge arm to be disconnected; and the fourth operation includes: controlling the first upper bridge arm and the second upper bridge arm to be conductive, and the first lower bridge arm and the second lower bridge arm to be disconnected. Thus, during the process of the first energy tank circuit discharging into the second group, the first energy tank circuit, the first group, and the second group can form a loop, and the first group can continuously discharge into the first energy tank circuit, further enhancing the depolarization effect on the first group. Similarly, during the process of the first energy tank circuit discharging into the first group, the first energy tank circuit, the first group, and the second group can form a loop, and the second group can continuously discharge into the first energy tank circuit, enhancing the depolarization effect on the second group.

[0022] In some embodiments, the first module further includes a second energy storage circuit connected in parallel to both ends of the first bridge arm. The first state further includes: executing, through the switching circuit, discharge of any one of the two battery packs whose voltage is greater than a first threshold into the second energy storage circuit, and the second energy storage circuit into the remaining battery pack. The second energy storage circuit can also enable discharge of the battery pack whose voltage is greater than the first threshold into the other battery pack, thereby enhancing the discharge efficiency of the battery pack and improving the depolarization effect in the first state.

[0023] In some embodiments, the two battery packs include: a first group and a second group, the first group being connected to the first bridge arm, and the first state further comprising: simultaneously discharging the first group into the first energy storage circuit and the first group into the second energy storage circuit, and simultaneously discharging the first energy storage circuit into the second group and the second energy storage circuit into the second group, through a switching circuit; and / or simultaneously discharging the second group into the first energy storage circuit and the first group into the second energy storage circuit, and simultaneously discharging the first energy storage circuit into the first group and the second energy storage circuit into the first group, through a switching circuit. In this way, the discharge amount of the first group in a short period of time can be increased, the discharge efficiency of the first group can be improved, and the depolarization effect in the first state can be further enhanced.

[0024] In some embodiments, the positive and negative electrodes of the battery are further connected to an external charging device, respectively. The two battery packs are connected in series, and the switching circuit includes: a first bridge arm, wherein a first end of the first bridge arm is connected to the positive electrode of the battery, and a second end is connected to the negative electrode of the battery. The midpoint of the first bridge arm is connected to the first end of a first energy storage circuit, and the second end of the first energy storage circuit is connected between the two battery packs. The method further includes: in response to the voltage of both battery packs being less than or equal to a first threshold, controlling the charging device to charge the battery; in response to the voltage of at least one of the two battery packs being greater than the first threshold, placing the battery in a first state via the first bridge arm and the first energy storage circuit. The first bridge arm enables the two battery packs to form a charging and discharging circuit with the first energy storage circuit, thereby depolarizing the series-connected batteries.

[0025] In some embodiments, the first module further includes a second energy storage circuit connected in parallel across the battery. The first state further includes: via the first bridge arm, discharging one of the two battery packs whose voltage is greater than a first threshold into the second energy storage circuit, and discharging the second energy storage circuit into the remaining battery pack. The second energy storage circuit can also enable the battery pack whose voltage is greater than the first threshold to discharge into the other battery pack, thereby enhancing the discharge efficiency of the battery pack and improving the depolarization effect in the first state.

[0026] In some embodiments, any one of the two battery packs whose voltage is greater than a first threshold is recorded as the first battery pack, and the remaining battery pack is recorded as the second battery pack. The first state further includes: simultaneously executing, through the first bridge arm, the first battery pack discharging to the first energy storage circuit and the second energy storage circuit discharging to the second battery pack, as well as simultaneously executing the first energy storage circuit discharging to the second battery pack and the first battery pack discharging to the second energy storage circuit. In this way, the discharge amount of the first battery pack in a short period of time can be increased, further improving the discharge efficiency of the first battery pack, thereby further improving the depolarization effect in the first state.

[0027] The above description is only an overview of the technical solution 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 present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0029] Figure 1 This is a functional block diagram of a battery control circuit according to some embodiments of the present application;

[0030] Figure 2 A current waveform diagram of a battery discharge process in some embodiments of the present application;

[0031] Figure 3 A current waveform diagram of a battery discharge process;

[0032] Figure 4 This is one of the structural diagrams of the battery control circuit in some embodiments of the present application;

[0033] Figure 5 A schematic diagram of a current path when a charging device according to some embodiments of the present application charges a battery;

[0034] Figure 6 This is one of the current path schematic diagrams of a battery in a first sub-state according to some embodiments of the present application;

[0035] Figure 7 This is a second schematic diagram of the current path of a battery in a first sub-state according to some embodiments of the present application;

[0036] Figure 8 This is one of the current path schematic diagrams of a battery in a second sub-state according to some embodiments of the present application;

[0037] Figure 9 This is a second schematic diagram of the current path of the battery in the second sub-state according to some embodiments of the present application;

[0038] Figure 10 This is the second structural diagram of the battery control circuit in some embodiments of the present application;

[0039] Figure 11 This is the third structural diagram of the battery control circuit of some embodiments of the present application;

[0040] Figure 12 This is a fourth structural diagram of a battery control circuit according to some embodiments of the present application;

[0041] Figure 13 This is the fifth structural diagram of the battery control circuit in some embodiments of the present application;

[0042] Figure 14 This is one of the flow charts of the battery charging control method according to some embodiments of the present application;

[0043] Figure 15 This is the second flowchart of the battery charging control method according to some embodiments of the present application.

[0044] Description of reference numerals:

[0045] Battery 101, first module 102, switch circuit 103, first energy storage circuit 104, controller 105, charging device 106, second energy storage circuit 107;

[0046] First group 11, second group 12, first bridge arm 20, second bridge arm 21, current sensor 23, first connector 24, second connector 25;

[0047] Capacitor C, first freewheeling diode D1, second freewheeling diode D2, first switch K1, second switch K2, third switch K3, fourth switch K4, positive charging relay K11, negative charging relay K12, first upper bridge arm switch tube V1, first lower bridge arm switch tube V2, second upper bridge arm switch tube V3, second lower bridge arm switch tube V4. DETAILED DESCRIPTION

[0048] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0050] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0051] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0052] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0053] 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).

[0054] Polarization occurs during the charging or discharging process. In some cases, one of the reasons for battery polarization is that when a large current flows through the electrodes, charge accumulates on the positive and negative electrodes of the battery, causing the electrode potential to deviate from the equilibrium potential. This creates a difference between the actual potential of the battery and the equilibrium potential. This difference leads to a polarization voltage. The greater the charging current, the more charge accumulates on the battery electrodes, and the greater the polarization voltage. The presence of polarization voltage increases the resistance of the battery, causing the current flowing through the battery to be smaller, thereby reducing the battery's charging efficiency.

[0055] The polarization voltage is proportional to the actual potential of the battery, that is, the voltage across the battery. During charging, if the battery voltage is too high, severe polarization may have occurred, reducing the battery's charging efficiency.

[0056] Based on the above considerations, a battery control circuit is designed, including: a first module and a controller, the first module including a switching circuit and a first energy storage circuit connected to the switching circuit; the controller is configured to: obtain the voltage of the battery pack during charging, and in response to the voltage of at least one battery pack being greater than a first threshold, control the battery to switch from a charging state to a first state through the first module, and the first state includes: executing mutual discharge of two battery packs through the first module.

[0057] When the voltage of the battery pack is greater than the first threshold, the polarization voltage of the battery pack is large, and the battery pack is prone to polarization. Therefore, in response to the voltage of at least one battery pack being greater than the first threshold, the two battery packs are discharged from each other through the first module, thereby realizing self-discharge of the battery pack whose voltage is greater than the first threshold. During the discharge process, the charge accumulated on the electrode that causes battery polarization decreases rapidly, which can reduce the polarization voltage of the battery pack, thereby improving the polarization phenomenon of the battery. In this way, high current charging of the battery can be maintained, thereby improving the charging efficiency of the battery. At the same time, since the two battery packs discharge each other, energy is transferred between the two battery packs, so that the power of the two battery packs after mutual discharge is consistent or basically consistent with the power before mutual discharge, thereby improving the problem of power loss due to excessive discharge of any one of the battery packs, and is conducive to improving the charging efficiency of the battery pack.

[0058] The battery control circuit disclosed in the embodiments of the present application can be used, but is not limited to, for charging batteries in electrical devices such as vehicles, ships, or aircraft.

[0059] Electrical devices may include, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery-powered vehicles, electric cars, ships, spacecraft, etc. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0060] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0061] A vehicle can be a gasoline-powered vehicle, a gas-powered vehicle, or a new energy vehicle. New energy vehicles can include pure electric vehicles, hybrid vehicles, or extended-range vehicles. The vehicle is equipped with a battery, which can be located at the bottom, front, or rear of the vehicle. The battery can be used to power the vehicle, for example, as a power source for its operation.

[0062] In some embodiments of the present application, the battery can serve not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0063] like Figure 1 As shown, an embodiment of the present application provides a battery control circuit, comprising: a first module 102 connected to a battery 101, the first module 102 including a switch circuit 103 and a first energy storage circuit 104 connected to the switch circuit 103, and the battery 101 including two battery packs connected to each other. The battery control circuit also includes: a controller 105 configured to: obtain the voltage of the battery pack during charging, and in response to the voltage of at least one battery pack being greater than a first threshold, control the battery 101 to switch from a charging state to a first state via the first module 102. The first state includes: executing, via the first module 102, a discharge of the two battery packs from each other.

[0064] The two battery packs can be connected in series or in parallel.

[0065] Controlling the battery 101 from the charging state to the first state via the first module 102 means stopping charging of the battery 101 in the first state. Charging the battery 101 may include charging one of the battery packs or charging both battery packs. By placing the battery in the first state, the battery can be depolarized.

[0066] The first state may include a first sub-state and a second sub-state. In response to the voltage of at least one of the two battery packs being greater than a first threshold, the controller may control the battery 101 to be in the first sub-state and the second sub-state. In the first sub-state, the battery pack with a voltage greater than the first threshold discharges to the remaining battery pack through the first energy storage circuit 104. In the second sub-state, the remaining battery pack discharges to the battery pack with a voltage greater than the first threshold through the first energy storage circuit 104, thereby achieving energy transfer between the two battery packs.

[0067] In some embodiments, the controller 105 may control the battery 101 to alternately and repeatedly be in the first sub-state and the second sub-state, so as to achieve a better depolarization effect on the battery 101 .

[0068] The first module 102 connects the positive and negative electrodes of each battery pack, thereby forming a loop with each battery pack to discharge the battery pack through the switch circuit 103 and the first energy storage circuit 104. Exemplarily, by controlling the switch circuit 103, any one of the two battery packs forms a loop with the first energy storage circuit 104, so that the battery pack discharges into the first energy storage circuit. The remaining other battery pack can also form a separate loop with the first energy storage circuit, so that the first energy storage circuit 104 discharges into the remaining other battery pack.

[0069] In some embodiments, the battery 101 may be controlled to switch from the charging state to the first state through the first module 102 only in response to the voltage of one battery pack being greater than the first threshold and the voltage of the other battery pack being less than or equal to the first threshold.

[0070] In other embodiments, in response to the voltages of both battery packs being greater than a first threshold, the first module 102 may control the battery 101 to switch from the charging state to the first state. The first state includes: one of the battery packs with a voltage greater than the first threshold discharges to the first energy storage circuit 104, and the first energy storage circuit 104 discharges to the other battery pack with a voltage greater than the first threshold. In the charging state, only the battery pack discharging to the first energy storage circuit 104 may be charged. In this way, after the battery pack is discharged, it can be charged with a high current.

[0071] It is understood that during the discharge process between the first battery pack and the second battery pack, the first battery pack can rapidly release accumulated charge, reducing the polarization voltage and improving polarization. Since the two battery packs discharge each other, in the first state, the second battery pack will also discharge into the first battery pack. If the polarization voltage of the second battery pack is higher, it can also release charge during the discharge process of the second battery pack, improving polarization. Furthermore, since the two battery packs discharge each other, the charge levels of the two battery packs after the discharge can remain consistent or substantially consistent with their pre-discharge levels, thereby maintaining high charging efficiency after continued charging. Because the currents during discharge of the first battery pack and the second battery pack are generally low, even when the first and second battery packs are being charged, charge will not rapidly accumulate within the first and second battery packs. In fact, charge accumulation may not occur within the second battery pack due to the low discharge currents of the first and second battery packs. Furthermore, when the discharge current and charge current are the same, the rate of charge release during discharge is greater than the rate of charge accumulation during charge. Therefore, the first and second battery packs can rapidly release charge during discharge, while the rate of charge accumulation during discharge is relatively slow. Therefore, the discharge process of the first battery group to the second battery group will not cause an increase in the polarization voltage of the second battery group.

[0072] The first threshold value can be a specific voltage value or a range of values. The first threshold value can be adjusted according to the type of battery 101. The method for setting the first threshold value can be to test the relationship between the charging rate of battery 101 and the voltage of the battery pack in advance. When the voltage of the battery pack is lower than a certain value or within a certain range of values, the charging rate is significantly reduced. In this case, the voltage value or range of values ​​can be set as the first threshold value. For example, the first threshold value can be 80% of the voltage of the battery pack when it is fully charged.

[0073] The controller 105 may include, but is not limited to, a microcontroller unit (MCU) of a vehicle, or a controller in a battery management system (BMS) of a battery.

[0074] In some embodiments, battery 101 further includes a voltage sensor for detecting the voltage of the battery pack. The voltage sensor is communicatively connected to a battery management system (BMS). A controller in the BMS can receive the voltage information of the battery pack detected by the voltage sensor and, in response to the voltage of at least one battery pack being greater than a first threshold, control battery 101 to be in a first state.

[0075] In some embodiments, the first energy tank circuit 104 may include, but is not limited to, an inductor.

[0076] In the above technical solution, in response to the voltage of at least one battery pack being greater than a first threshold, the first module performs an operation of discharging the two battery packs from each other, thereby achieving the discharge of the battery pack whose voltage is greater than the first threshold. During the discharge process, the charge accumulated on the electrode that causes the polarization of the battery 101 decreases rapidly, which can reduce the polarization voltage of the battery pack, thereby improving the polarization phenomenon of the battery 101. In this way, it is possible to maintain high current charging of the battery 101 and improve the charging efficiency of the battery 101. At the same time, since the two battery packs discharge each other, energy is transferred between the two battery packs, so that the power of the two battery packs after the mutual discharge is consistent with the power before the mutual discharge, reducing the problem of power loss due to excessive discharge of any one of the battery packs is conducive to improving the charging efficiency of the battery pack.

[0077] like Figure 10 As shown, according to some embodiments of the present application, any one of the two battery groups whose voltage is greater than the first threshold is recorded as the first battery group, and the remaining battery group is recorded as the second battery group, and the controller 105 is further configured to: in the first state, through the switching circuit 103, repeat the operation of discharging the first battery group to the first energy storage circuit 104 and discharging the first energy storage circuit 104 to the second battery group N1 times, N1 is an integer greater than 1; and / or, in the first state, through the switching circuit, repeat the operation of discharging the second battery group to the first energy storage circuit and discharging the first energy storage circuit to the first battery group N2 times, N2 is an integer greater than 1.

[0078] In other words, in the first sub-state, the operation of discharging the first battery pack into the first energy storage circuit 104 and the operation of discharging the first energy storage circuit 104 into the second battery pack are repeated alternately N1 times; and / or in the second sub-state, the operation of discharging the second battery pack into the first energy storage circuit 104 and the operation of discharging the first energy storage circuit 104 into the first battery pack are repeated alternately N2 times. In this way, while achieving energy balance between the first and second battery packs, the discharged state of the first battery pack and / or the discharged state of the second battery pack can be maintained for a longer period of time.

[0079] In some embodiments, the operation of discharging the first battery pack to the first energy storage circuit 104 and the first energy storage circuit 104 to the second battery pack can be repeated N1 times, and the operation of discharging the second battery pack to the first energy storage circuit and the first energy storage circuit to the first battery pack can be repeated once.

[0080] In other embodiments, the operation of discharging the second battery pack to the first energy storage circuit 104 and the first energy storage circuit 104 to the first battery pack may be repeated N2 times, and the operation of discharging the first battery pack to the first energy storage circuit and the first energy storage circuit to the second battery pack may be performed once.

[0081] In some other embodiments, the operation of discharging the first battery pack to the first energy storage circuit 104 and the first energy storage circuit 104 to the second battery pack may be repeated N1 times, and the operation of discharging the second battery pack to the first energy storage circuit 104 and the first energy storage circuit 104 to the first battery pack may be repeated N2 times.

[0082] The values ​​of N1 and N2 can be determined in advance by conducting experiments on battery packs of the same model, so that after the operation of discharging the first battery pack into the first energy storage circuit 104 and the operation of discharging the first energy storage circuit 104 into the second battery pack is repeated N1 times; and / or after the operation of discharging the second battery pack into the first energy storage circuit 104 and the operation of discharging the first energy storage circuit 104 into the first battery pack is repeated N2 times, the voltages of the first battery pack and the second battery pack are both less than or equal to the first threshold. The value of N2 can be equal to or different from the value of N1.

[0083] Compared to only performing one discharge of the first battery group to the first energy storage circuit 104 and one discharge of the first energy storage circuit 104 to the second battery group, and one discharge of the second battery group to the first energy storage circuit 104 and one discharge of the first energy storage circuit 104 to the first battery group, the above technical solution can reduce the rate of change of the current flowing through the first energy storage circuit 104, thereby reducing the current frequency, reducing the current ripple, and improving the depolarization efficiency of the first battery group.

[0084] like Figure 2 As shown, Figure 2 2 shows a waveform diagram of the current passing through the first energy storage circuit 104 when the first battery pack discharges to the first energy storage circuit 104 and the first energy storage circuit 104 discharges to the second battery pack multiple times, and when the second battery pack discharges to the first energy storage circuit 104 and the first energy storage circuit 104 discharges to the first battery pack multiple times in the first state.

[0085] like Figure 2 As shown, the battery is first controlled to enter the first sub-state, and the first battery pack discharges to the second battery pack. During the discharge of the first battery pack to the first energy storage circuit 104, the current in the first energy storage circuit 104 gradually increases from 0 to the positive first current I up When the first energy storage circuit 104 discharges to the second battery pack, the direction of the current flowing through the first energy storage circuit 104 remains unchanged. However, since the first energy storage circuit 104 releases energy, the current in the first energy storage circuit 104 changes from the positive first current I up Gradually decreases to the positive second current I down .

[0086] Repeat the above process, that is, the first battery pack discharges to the first energy storage circuit 104 again, so that the current in the first energy storage circuit 104 rises to I again. up , so that the current in the first energy storage circuit 104 is the positive first current I up and the positive second current I down The first sub-state changes alternately until the first sub-state ends and the current in the first energy storage circuit 104 becomes 0.

[0087] After the first sub-state ends, the current in the first energy storage circuit 104 becomes 0, and the second sub-state is entered, and the second battery pack discharges to the first battery pack. In the second sub-state, the second battery pack charges the first energy storage circuit, so that the current in the first energy storage circuit gradually increases. Since in the second sub-state, the second battery pack charges the first energy storage circuit, and the first energy storage circuit charges the first battery pack, compared with the first sub-state, the current flowing through the first energy storage circuit is reversed, so the current is negative. The current in the first energy storage circuit is negative at the first current -I up and a negative second current -I down The state alternates between the two until the second sub-state ends and the current in the first energy storage circuit becomes 0.

[0088] Figure 32 shows a waveform diagram of the current passing through the first energy storage circuit 104 in the first state when only one discharge of the first battery pack to the first energy storage circuit 104 and one discharge of the first energy storage circuit 104 to the second battery pack are performed alternately, and one discharge of the second battery pack to the first energy storage circuit and one discharge of the first energy storage circuit to the first battery pack are performed alternately.

[0089] like Figure 3 As shown, during the discharge of the first battery pack to the first energy storage circuit 104, the current in the first energy storage circuit 104 gradually increases from 0 to the positive first current I up When the first energy storage circuit 104 discharges to the second battery pack, the current in the first energy storage circuit 104 changes from the positive first current I up Since the operation of discharging the first battery pack to the first energy storage circuit 104 is only performed once, the first energy storage circuit 104 will continue to release energy until the current in the first energy storage circuit 104 is reduced to 0. Similarly, during the period when the second battery pack discharges to the first battery pack, the current in the first energy storage circuit is between the negative first current -I up and varies between 0.

[0090] From the above, we can see that Figure 2 In the case shown, in the first sub-state, the current through the first energy storage circuit 104 is at the positive first current I up and the positive second current I down In the second sub-state, the current passing through the first energy storage circuit is between the negative first current -I up and a negative second current -I down and alternate between. Figure 3 In the case shown, the current through the first energy storage circuit 104 is the positive first current I up and the negative first current -I up That is, Figure 2 The rate of change of the current through the first energy storage circuit 104 in the case shown is much smaller than Figure 3 The rate of change of the current through the first energy storage circuit 104 in the case shown thereby reduces the frequency of the current.

[0091] In the above technical solution, the first energy storage circuit 104 can not only control the discharge amount of the first battery group each time to not be too much, but also can realize the first battery group to discharge to the second battery group multiple times, and / or realize the second battery group to discharge to the first battery group multiple times, to realize small amounts of multiple discharges, thereby reducing the risk of power outage of the first battery group and the second battery group while maintaining the first state for a longer time, enhancing the discharge of the first battery group and / or the second battery group, and thus enhancing the depolarization effect on the battery.

[0092] like Figure 4 and Figure 5 As shown, according to some embodiments of the present application, the positive and negative electrodes of the battery 101 are further connected to an external charging device 106, respectively, and the negative electrodes of the two battery packs are connected. The switching circuit 103 includes: a first switch K1, the first switch K1 is connected to the positive electrodes of the two battery packs; a first bridge arm 20, the two ends of the first bridge arm 20 are respectively connected to the positive electrode and the negative electrode of one of the battery packs, and the midpoint of the first bridge arm 20 is connected to the first end of the first energy storage circuit 104; a second bridge arm 21, the two ends of the second bridge arm 21 are respectively connected to the positive electrode and the negative electrode of the other battery pack, and the second end of the first energy storage circuit 104 is connected to the midpoint of the second bridge arm 21; the controller 105 is further configured to: in response to the voltages of the two battery packs being less than or equal to the first threshold, control the first switch K1 to close so that the charging device 106 charges the battery 101; in response to the voltage of the battery pack being greater than the first threshold during charging, control the first switch K1 to open, and put the battery 101 into the first state through the first bridge arm 20, the second bridge arm 21 and the first energy storage circuit 104.

[0093] For example, after the negative poles of the two battery packs are connected, they can be connected to the negative terminal of the charging device 106, and the positive poles of the two battery packs can be connected to the positive terminal of the charging device 106 respectively. When the first switch K1 is closed, the two battery packs are connected in parallel, and the charging device 106 can supply power to the two battery packs.

[0094] The charging device 106 may include but is not limited to a device such as a charging pile that can charge the battery 101 . The positive terminal and the negative terminal of the charging device 106 may be a charging gun of the charging device 106 .

[0095] In some embodiments, the charging device 106 may further include a positive charging relay K11 and a negative charging relay K12, wherein the positive charging relay K11 is used to connect the positive electrode of the battery 101, that is, to connect the positive electrodes of the two battery packs, and the negative charging relay K12 is used to connect the negative electrode of the battery 101, that is, to connect the negative electrodes of the two battery packs. When charging is not required, for example, when controlling the battery 101 to enter the first state, the controller 105 controls the positive charging relay K11 and the negative charging relay K12 to be disconnected. In the charging state, the controller 105 controls the positive charging relay K11 and the negative charging relay K12 to be closed. Exemplarily, the controller 105 may be the controller 105 on the BMS, and the charging device 106 is a charging pile. The BMS obtains the battery pack voltage. When the voltage of at least one battery pack is greater than a first threshold, the controller 105 sends a message to the charging pile to enter the first state, so that the charging pile disconnects the positive charging relay K11 and the negative charging relay K12.

[0096] When the voltages of the two battery packs are both less than the first threshold, there is no polarization phenomenon in the two battery packs or the polarization phenomenon is weak, and the efficiency of charging the battery 101 is high at this time. The controller 105 controls the battery 101 to enter the charging state, and controls the first switch K1, the charging positive relay K11 and the charging negative relay K12 to be closed. The two battery packs are connected in parallel, and the charging device 106 connects the positive and negative poles of the parallel battery packs to charge the battery packs. Exemplarily, the controller 105 can be the controller 105 on the BMS, and the charging device 106 is a charging pile. The BMS obtains the battery pack voltage. When the voltages of the two battery packs are both less than or equal to the first threshold, the controller 105 sends a message to the charging pile to enter the charging state, so that the charging pile closes the charging positive relay K11 and the charging negative relay K12, and charges the battery 101.

[0097] The voltages of the two battery packs are consistent during charging. Therefore, in response to the voltage of any one of the battery packs being greater than the first threshold, the controller 105 controls the first switch K1 to be disconnected, so as to control the battery 101 to enter the first state.

[0098] In some embodiments, during the entire charging process of the battery, the controller may only perform the operation of disconnecting the first switch K1 to place the battery in the first state a limited number of times in response to the voltage of the battery pack being greater than a first threshold during charging, so that the battery can be fully charged smoothly. For example, the controller may disconnect the first switch K1 to control the battery to enter the first state only in response to the first detection during charging of any battery pack that the voltage is greater than the first threshold.

[0099] The first bridge arm 20 and the second bridge arm 21 are respectively connected to different battery groups, and the first bridge arm 20 and the second bridge arm 21 are connected through the first energy storage circuit 104, so that the first energy storage circuit 104 can form a loop with different battery groups through the first bridge arm 20 and the second bridge arm 21, respectively, thereby enabling the discharge of the first battery group to the first energy storage circuit 104 and the discharge of the first energy storage circuit 104 to the second battery group.

[0100] In the first bridge arm 20 and the second bridge arm 21, the on-off of the circuits on both sides of the midpoint can be controlled separately. The first end of the first energy storage circuit 104 is connected to the midpoint of the first bridge arm 20, and the second end is connected to the midpoint of the second bridge arm 21. By controlling the different conduction modes of the circuits on both sides of the midpoint of the first bridge arm 20 and the circuits on both sides of the midpoint of the second bridge arm 21, the first energy storage circuit 104 and different battery packs can form different charging and discharging circuits, thereby controlling the battery 101 to be in the first state.

[0101] In some embodiments, the first switch K1 may include but is not limited to a relay or other element capable of functioning as a switch.

[0102] In the above technical solution, the controller 105 controls the first switch K1 to close to charge the two parallel battery packs. The controller 105 also controls the first switch K1 to open, allowing the two battery packs to form a charging and discharging circuit through the first bridge arm 20 and the second bridge arm 21, respectively, thereby depolarizing the battery 101. In other words, the battery 101 can be switched between the charging state and the first state by turning the first switch K1 on and off.

[0103] like Figures 6 to 9 As shown, according to some embodiments of the present application, two battery packs include: a first group 11 and a second group 12, the first bridge arm 20 includes: a first upper bridge arm and a first lower bridge arm, the first upper bridge arm and the first lower bridge arm are respectively connected to the positive electrode and the negative electrode of the first group 11, the second bridge arm 21 includes: a second upper bridge arm and a second lower bridge arm, the second upper bridge arm and the second lower bridge arm are respectively connected to the positive electrode and the negative electrode of the second group 12, and the controller 105 is configured to be able to:

[0104] Alternatingly performing the first operation and the second operation so that the first group 11 discharges into the first energy storage circuit 104 and the first energy storage circuit 104 discharges into the second group 12;

[0105] The third operation and the fourth operation are alternately performed so that the second group 12 discharges into the first tank circuit 104 and the first tank circuit 104 discharges into the first group 11 .

[0106] The first operation includes: controlling the first upper bridge arm and the second lower bridge arm to be turned on, and the first lower bridge arm and the second upper bridge arm to be turned off.

[0107] The second operation includes: controlling the first upper bridge arm and the second upper bridge arm to be turned on, and the first lower bridge arm and the second lower bridge arm to be turned off.

[0108] The third operation includes: controlling the first lower bridge arm and the second upper bridge arm to be turned on, and controlling the first upper bridge arm and the second lower bridge arm to be turned off.

[0109] The fourth operation includes: controlling the first upper bridge arm and the second upper bridge arm to be turned on, and controlling the first lower bridge arm and the second lower bridge arm to be turned off.

[0110] To facilitate a clear description of the connection between the first bridge arm 20, the second bridge arm 21, and the two battery groups, as well as the method for controlling the depolarization of the battery 101, the two batteries 101 are named first group 11 and second group 12, respectively. For example, during charging, if the voltage of the first group 11 is greater than a first threshold, the first group serves as the first battery group; if the voltage of the second group 12 is greater than the first threshold, the second group 12 serves as the first battery group. If the voltages of both the first and second groups are greater than the first threshold, either the first group 11 or the second group 12 can serve as the first battery group, and the other can serve as the second battery group.

[0111] The controller can alternately perform the first operation and the second operation, and alternately perform the third operation and the fourth operation in response to the voltage of the first group 11 and the second group 12 being greater than the first threshold during charging, or can alternately control the battery 101 to be in the first sub-state and the second sub-state, in the first sub-state, alternately perform the first operation and the second operation N1 times, and in the second sub-state, alternately perform the third operation and the fourth operation N2 times.

[0112] The first upper bridge arm includes a first upper bridge arm switching transistor V1, and the first lower bridge arm includes a first lower bridge arm switching transistor V2. The first upper bridge arm can be turned on / off by turning on / off the first upper bridge arm switching transistor V1, and the first lower bridge arm can be turned on / off by turning on / off the first lower bridge arm switching transistor V2. The types of the first upper bridge arm switching transistor V1 and the first lower bridge arm switching transistor V2 include, but are not limited to, MOS transistors (Metal-Oxide-Semiconductor Field-Effect Transistors) or IGBT transistors (Insulated-Gate Bipolar Transistors).

[0113] The second upper bridge arm includes a second upper bridge arm switching transistor V3, and the second lower bridge arm includes a second lower bridge arm switching transistor V4. The second upper bridge arm can be turned on / off by turning on / off the second upper bridge arm switching transistor V3, and the second lower bridge arm can be turned on / off by turning on / off the second lower bridge arm switching transistor V4. The types of the second upper bridge arm switching transistor V3 and the second lower bridge arm switching transistor V4 include, but are not limited to, MOS transistors or IGBT transistors.

[0114] The controller 105 is configured to perform a first operation so that the first group 11, the first upper bridge arm, the first energy storage circuit 104 and the second lower bridge arm form a loop, and the current flows from the positive pole of the first group 11 through the first upper bridge arm, the first energy storage circuit 104 and the second lower bridge arm, and then flows back to the negative pole of the first group 11, and the first group 11 discharges to the first energy storage circuit 104; and perform a second operation so that the first group 11, the first upper bridge arm, the first energy storage circuit 104, the second upper bridge arm and the second group 12 form a loop, and the current flows from the first energy storage circuit 104 through the positive pole of the second group 12, the first group 11 and the first upper bridge arm, and then flows back to the first energy storage circuit 104, and the first energy storage circuit 104 discharges to the second group 12.

[0115] In some embodiments, the first energy storage circuit 104 is an inductor, such as Figure 6 The solid line with arrows in the middle shows the current path of the first group 11 discharging to the inductor. Figure 7 The solid line with an arrow in it shows the current path for discharging the inductor to the second group 12 .

[0116] During the second operation, the first end of the first energy tank circuit 104 is connected to the first group 11 via the first upper bridge arm, and the second end of the first energy tank circuit 104 is connected to the second group 12 via the second upper bridge arm. In this way, the voltage of the first group 11 and the first energy tank circuit 104 connected in series is greater than the voltage of the second group 12, allowing the first energy tank circuit 104 to discharge into the second group 12. Furthermore, while the first energy tank circuit 104 is charging the second group 12, the first group 11 can continue to discharge into the first energy tank circuit 104, thereby enhancing the depolarization effect of the first group 11.

[0117] The controller 105 is configured to perform a third operation so that the second group 12, the second upper bridge arm, the first energy storage circuit 104 and the first lower bridge arm form a loop, and after the current flows out from the positive pole of the second group 12, it flows through the second upper bridge arm, the first energy storage circuit 104, the first lower bridge arm, and finally flows back to the negative pole of the second group 12, and the second group 12 discharges to the first energy storage circuit 104; perform a fourth operation so that the first group 11, the first upper bridge arm, the first energy storage circuit 104, the second upper bridge arm and the second group 12 form a loop, and after the current flows out from the first energy storage circuit 104, it flows through the first upper bridge arm, the positive and negative poles of the first battery group, and the second battery group, and finally flows back to the first energy storage circuit 104, and the first energy storage circuit 104 discharges to the first group 11.

[0118] In some embodiments, the first energy storage circuit 104 is an inductor, such as Figure 8 The solid line with arrows in the middle shows the current path of the second group 12 to discharge the inductor. Figure 9 The solid line with an arrow in it shows the current path for discharging the inductor to the first group 11 .

[0119] During the fourth operation, the first end of the first energy tank circuit 104 is connected to the first group 11 via the first upper bridge arm, and the second end of the first energy tank circuit 104 is connected to the second group 12 via the second upper bridge arm. In this way, the voltage of the second group 12 and the first energy tank circuit 104 connected in series is greater than the voltage of the first group 11, allowing the first energy tank circuit 104 to discharge into the first group 11. Furthermore, while the first energy tank circuit 104 is charging the first group 11, the second group 12 can continue to discharge into the first energy tank circuit 104, thereby enhancing the depolarization effect of the second group 12.

[0120] In some embodiments, the first upper bridge arm switch tube V1 is correspondingly provided with a first freewheeling diode D1, and the first lower bridge arm switch tube V2 is correspondingly provided with a second freewheeling diode D2. In the gap between the first operation switching to the second operation and the gap between the second operation switching to the first operation, the current can be freewheeled from the first freewheeling diode D1. Similarly, in the gap between the third operation switching to the fourth operation, the current can be freewheeled from the second freewheeling diode D2, and in the gap between the fourth operation switching to the third operation, the current can be freewheeled from the first freewheeling diode D1, so that during the first state, there is always current passing through the inductor, thereby making the rate of change of the current passing through the inductor small, and keeping the frequency of the current flowing through the inductor low. When there are multiple inductors and the multiple inductors are three-phase windings in the motor, the problem of high-frequency whistling of the motor caused by excessive current flowing through the motor can be greatly improved, and the performance of the motor can be kept relatively stable, thereby improving the depolarization effect on the battery 101.

[0121] In some embodiments, the battery control circuit further includes a second switch K2 and a third switch K3. The first end of the second switch K2 is connected to the positive electrode of the first group 11, and the second end of the second switch K2 is connected to the first upper bridge arm, for controlling the connection / disconnection between the positive electrode of the first group 11 and the first upper bridge arm. The first end of the third switch K3 is connected to the negative electrode of the first group 11, and the second end of the third switch K3 is connected to the first lower bridge arm, for controlling the connection / disconnection between the negative electrode of the first group 11 and the first lower bridge arm. In this way, when the battery 101 needs to be depolarized, the second switch K2 and the third switch K3 can control the connection between the first group 11 and the first bridge arm 20. When the battery 101 does not need to be depolarized, the second switch K2 and the third switch K3 can control the disconnection between the first group 11 and the first bridge arm 20, thereby not affecting the normal performance of the battery 101.

[0122] In some embodiments, the second switch K2 may be connected to the first upper bridge arm through the first connector 24 , and the third switch K3 may be connected to the first lower bridge arm through the second connector 25 .

[0123] In some embodiments, the battery control circuit further includes a fourth switch K4 and a first resistor R connected in parallel with the third switch K3. The third switch K3 and the first resistor R are connected in series to perform current limiting protection.

[0124] In some embodiments, the battery control circuit further includes a current sensor 23, which is connected between the first group 11 and the first bridge arm 20. For example, the current sensor 23 can be connected between the positive electrode of the battery 101 and the second switch K2, and is used to detect the current output by the battery 101, so as to facilitate the regulation of the current used for battery depolarization in the battery control circuit, so as to produce a better depolarization effect on the battery 101.

[0125] In some embodiments, the second switch K2 , the third switch K3 , and the fourth switch K4 may include, but are not limited to, relays.

[0126] In the above technical solution, during the process of the first energy storage circuit 104 discharging to the second group 12, the first energy storage circuit 104, the first battery group and the second battery group can form a loop, and the first battery group can continue to discharge to the first energy storage circuit 104, further improving the depolarization effect on the first battery group. In addition, it is also possible to make the voltage after the first battery group and the first energy storage circuit 104 are connected in series greater than the voltage of the second battery group, thereby improving the success rate of the first energy storage circuit 104 discharging smoothly to the second battery group. Similarly, during the process of the first energy storage circuit 104 discharging to the first battery group, the first energy storage circuit 104, the first battery group and the second battery group can form a loop, and the second battery group can continue to discharge to the first energy storage circuit 104, thereby improving the success rate of the first energy storage circuit 104 discharging smoothly to the first battery group and improving the depolarization effect on the second battery group.

[0127] like Figure 10 As shown, according to some embodiments of the present application, the first module 102 also includes a second energy storage circuit 107, and the second energy storage circuit 107 is connected in parallel to the two ends of the first bridge arm 20, and the controller 105 is further configured to: in the first state, through the switching circuit 103, execute any one of the two battery packs whose voltage is greater than the first threshold to discharge to the second energy storage circuit 107 and the second energy storage circuit 107 to discharge to the remaining other battery pack.

[0128] That is, the two ends of the second energy storage circuit 107 are respectively connected to the positive electrode and the negative electrode of one of the battery packs. Since the two ends of the second energy storage circuit 107 are respectively connected to the two ends of the first bridge arm 20, and the first bridge arm 20 is connected to the first energy storage circuit 104, the second energy storage circuit 107 can be connected to the other battery pack through the first bridge arm 20, the first energy storage circuit 104, and the second bridge arm 21. Therefore, it is possible to perform the operation of discharging from any battery pack with a voltage greater than the first threshold to the second energy storage circuit 107 and the second energy storage circuit 107 to the remaining other battery pack.

[0129] Since the two battery packs are connected in parallel during charging, the voltages of the two battery packs are consistent during charging. For example, the two battery packs include a first pack 11 and a second pack 12. In a first state, the first pack 11 can discharge into the second tank circuit 107 and the second tank circuit 107 can discharge into the second pack 12, and / or the second pack 12 can discharge into the second tank circuit 107 and the second tank circuit 107 can discharge into the first pack 11.

[0130] In some embodiments, the second energy storage circuit 107 may include but is not limited to elements with charging and discharging functions such as inductors or capacitors.

[0131] In the above technical solution, the second energy storage circuit 107 can also enable the battery pack with a voltage greater than the first threshold to discharge to another battery pack, thereby enhancing the discharge efficiency of the battery pack and improving the depolarization effect in the first state.

[0132] like Figure 10 As shown, according to some embodiments of the present application, the two battery groups include: a first group 11 and a second group 12, the first group 11 is connected to the first bridge arm 20, and the controller 105 is further configured to: in a first state, through the switching circuit 103, simultaneously execute the first group 11 discharging to the first energy storage circuit 104 and the first group 11 discharging to the second energy storage circuit 107, and simultaneously execute the first energy storage circuit 104 discharging to the second group 12 and the second energy storage circuit 107 discharging to the second group 12; and / or in the first state, through the switching circuit 103, simultaneously execute the second group 12 discharging to the first energy storage circuit 104 and the first group 11 discharging to the second energy storage circuit 107, and simultaneously execute the first energy storage circuit 104 discharging to the first group 11 and the second energy storage circuit 107 discharging to the first group 11.

[0133] Since the second energy storage circuit 107 is connected in parallel with the first bridge arm 20, and the first group 11 is connected to the first bridge arm 20, that is, the second energy storage circuit 107 is connected in parallel with the first group 11, so that the first group 11 can release energy to the second energy storage circuit 107, and the second energy storage circuit 107 can release energy to the first group 11.

[0134] Illustratively, during the execution of the first operation so that the first group 11, the first upper bridge arm, the first energy storage circuit 104 and the second lower bridge arm form a loop, the second energy storage circuit 107 can form a loop with the first group 11 so that the first group 11 discharges to the first energy storage circuit 104 and the second energy storage circuit 107 at the same time, that is, the second energy storage circuit 107 stores energy.

[0135] During the execution of the second operation so that the first group 11, the first upper bridge arm, the first energy storage circuit 104, the second upper bridge arm and the second group 12 form a loop, the second energy storage circuit 107 is able to form a loop with the second group 12, the first upper bridge arm, the first energy storage circuit 104 and the second upper bridge arm, and the second energy storage circuit 107 releases energy to the second group 12.

[0136] That is, during the execution of the first operation and the second operation, the first group 11 can discharge to the second group 12 through the first energy storage circuit 104 and the second energy storage circuit 107 at the same time.

[0137] During the execution of the third operation, the second group 12, the second upper bridge arm, the first energy storage circuit 104 and the first lower bridge arm form a loop so that the second group 12 discharges to the first energy storage circuit 104, and the second energy storage circuit 107 can form a loop with the first group 11 alone so that the first group 11 discharges to the second energy storage circuit 107, and the second energy storage circuit 107 stores energy.

[0138] During the execution of the fourth operation, the first group 11, the first upper bridge arm, the first energy storage circuit 104, the second upper bridge arm and the second group 12 form a loop, so that the first energy storage circuit 104 discharges to the first group 11, the second energy storage circuit 107 can form a loop with the first group 11, and the second energy storage circuit 107 releases energy to the first group 11.

[0139] That is, during the execution of the third operation and the fourth operation, the second group 12 can discharge to the first group 11 through the first energy storage circuit 104 , and the first group 11 can exchange energy with the second energy storage circuit 107 .

[0140] In the above technical solution, the second energy storage circuit 107 can increase the discharge amount of the first group 11 in a short period of time, thereby improving the discharge efficiency of the first group 11 and further improving the depolarization effect in the first state.

[0141] like Figure 11 As shown, according to some embodiments of the present application, the first energy storage circuit 104 includes at least one inductor, and the second energy storage circuit 107 includes a capacitor C.

[0142] In some embodiments, the first tank circuit 104 may include an inductor.

[0143] In other embodiments, the first energy tank circuit 104 may also include multiple inductors, which may be connected in parallel or in series, or some of the multiple inductors may be connected in series with the remaining inductors. The number of first bridge arms 20 may be multiple, and the number of first bridge arms 20 is the same as the number of parallel inductors, and the parallel inductors are connected to the multiple first bridge arms 20 in a one-to-one correspondence.

[0144] Exemplarily, the first energy storage circuit 104 may include three first inductors L1 and one second inductor L2, wherein the three first inductors L1 are connected in parallel and then in series with the second inductor L2. The number of first bridge arms 20 is three, and the three first inductors L1 are connected to the three first bridge arms 20 in a one-to-one correspondence, wherein the first end of the first inductor L1 is connected to the midpoint of the first bridge arm 20, the first end of the second inductor L2 is connected to the second end of the first inductor L1, and the second end of the second inductor L2 is connected to the midpoint of the second bridge arm 21. The three first inductors L1 may be three-phase windings in a motor, and the bridge arm connected to the first inductor L1 may be a three-phase bridge arm. In this way, when charging a vehicle equipped with the battery 101, the existing motor and three-phase bridge arm in the vehicle can be used to depolarize the battery 101, thereby reducing costs.

[0145] Both the capacitor C and the inductor have the function of charging and discharging. The first energy storage circuit 104 is provided to include at least one inductor, and the second energy storage circuit 107 includes a capacitor C. It is possible to simultaneously execute the discharge of the first group 11 to the inductor and the discharge of the first group 11 to the capacitor C, and simultaneously execute the discharge of the inductor to the second group 12 and the discharge of the capacitor C to the second group 12 through the switching circuit 103; and / or, simultaneously execute the discharge of the second group 12 to the inductor and the discharge of the first group 11 to the capacitor C, and simultaneously execute the discharge of the inductor to the first group 11 and the discharge of the capacitor C to the first group 11 through the switching circuit 103.

[0146] like Figure 11 As shown, the capacitor C is connected in parallel to both ends of the first group 11. During the period when the first group 11, the first upper bridge arm, the inductor and the second lower bridge arm form a loop, the capacitor C can form a loop with the first group 11, the first upper bridge arm, the inductor and the second lower bridge arm, so that the first group 11 discharges to the capacitor C and the inductor at the same time, that is, the capacitor C and the inductor store energy.

[0147] During the period when the first group 11 , the first upper bridge arm, the inductor, the second upper bridge arm and the second group 12 form a loop, the capacitor C can form a loop with the second group 12 , the first upper bridge arm, the inductor and the second upper bridge arm, and the inductor and the capacitor C release energy to the second group 12 .

[0148] The second group 12, the second upper bridge arm, the inductor and the first lower bridge arm form a loop, so that when the second group 12 discharges to the inductor, the capacitor C can form a loop with the first group 11 alone, so that the first group 11 discharges to the capacitor C, and the capacitor C stores energy.

[0149] The first group 11 , the first upper bridge arm, the inductor, the second upper bridge arm and the second group 12 form a loop so that the inductor discharges to the first group 11 , and the capacitor C acts as a substitute power source, releasing energy to the first group 11 .

[0150] In the above technical solution, the capacitor has a small volume and can realize fast charge and discharge, which further improves the depolarization effect on the battery 101 while keeping the volume of the battery control circuit small, reducing the weight of the battery control circuit and reducing the cost.

[0151] like Figure 12 As shown, according to some embodiments of the present application, the positive and negative electrodes of the battery 101 are also respectively connected to an external charging device 106, and the two battery packs are connected in series. The switching circuit 103 includes: a first bridge arm 20, a first end of the first bridge arm 20 is connected to the positive electrode of the battery 101, and a second end is connected to the negative electrode of the battery 101, wherein the midpoint of the first bridge arm 20 is connected to the first end of the first energy storage circuit 104, and the second end of the first energy storage circuit 104 is connected between the two battery packs. The controller 105 is also configured to: in response to the voltages of the two battery packs being less than or equal to the first threshold, control the charging device 106 to charge the battery 101; in response to the voltage of at least one of the two battery packs being greater than the first threshold, put the battery 101 in a first state through the first bridge arm 20 and the first energy storage circuit 104.

[0152] When two battery packs are connected in series, the voltages of the two battery packs can be the same or different.

[0153] The first bridge arm 20 may include a first upper bridge arm and a first lower bridge arm, and the first end of the first energy storage circuit 104 is connected to a node between the first upper bridge arm and the first lower bridge arm.

[0154] Of the two battery groups, one battery group whose voltage is greater than the first threshold is recorded as a first battery group, and the remaining battery group is recorded as a second battery group.

[0155] In some embodiments, the first state includes a first sub-state and a second sub-state, and the controller 105 is configured to: in the first sub-state, alternately and repeatedly perform at least one discharge of the first battery pack to the first energy storage circuit 104 and the discharge of the first energy storage circuit 104 to the second battery pack; in the second sub-state, alternately and repeatedly perform at least one discharge of the second battery pack to the first energy storage circuit 104 and the discharge of the first energy storage circuit 104 to the first battery pack. In other words, the first battery pack and the second battery pack exchange energy. In this way, regardless of whether the voltage of the second battery pack is greater than the first threshold, after the first state ends, the first battery pack and the second battery pack can maintain energy balance. In other words, the voltage of the second battery pack will not increase, thereby preventing the problem of serious polarization of the second battery pack. In addition, when the voltage of the second battery pack is greater than the first threshold, the second battery pack can also be depolarized.

[0156] During the entire battery charging process, the operation of placing the battery 101 in the first state via the first bridge arm 20 and the first energy storage circuit 104 may be performed only a limited number of times in response to the voltage of at least one battery pack being greater than a first threshold value during charging, so that the battery can be fully charged smoothly. For example, the controller may place the battery 101 in the first state via the first bridge arm 20 and the first energy storage circuit 104 only in response to the first detection during battery charging that the voltage of any battery pack is greater than the first threshold value.

[0157] In some embodiments, the charging device 106 may include a positive charging relay K11 and a negative charging relay K12, wherein the positive charging relay K11 is connected to the positive terminal of the battery 101, and the negative charging relay K12 is connected to the negative terminal of the battery 101. The method for controlling the conduction or disconnection of the positive charging relay K11 and the negative charging relay K12 can be referred to the relevant description above and will not be repeated here.

[0158] The following describes the principle of the battery control circuit by taking the example that the negative electrode of the first battery pack is connected to the positive electrode of the second battery pack, the first upper bridge arm is connected to the positive electrode of the first battery pack, the first lower bridge arm is connected to the negative electrode of the second battery pack, and the first state includes a first sub-state and a second sub-state.

[0159] The controller 105 is configured to alternately perform the fifth operation and the sixth operation in sequence to place the battery 101 in the first sub-state, and alternately perform the sixth operation and the fifth operation in sequence to place the battery 101 in the second sub-state.

[0160] The fifth operation includes: controlling the first upper bridge arm to be turned on and the first lower bridge arm to be turned off. The sixth operation includes: controlling the first lower bridge arm to be turned on and the first upper bridge arm to be turned off.

[0161] In the first sub-state, the fifth operation and the sixth operation are performed alternately in sequence. During the execution of the fifth operation, the first group 11, the first upper bridge arm and the first energy storage circuit 104 form a loop, and the current flows from the positive electrode of the first group 11 through the upper bridge arm and the first energy storage circuit 104, and then flows back to the negative electrode of the first group 11, and the first group 11 stores energy.

[0162] The sixth operation is performed, the first lower bridge arm is turned on, the first upper bridge arm is turned off, the first energy storage circuit 104, the first lower bridge arm and the second group 12 form a loop, and the current flows from the first energy storage circuit 104 through the positive electrode of the second group 12, the negative electrode of the second group 12 and the first lower bridge arm and then flows back to the first energy storage circuit 104, that is, the first energy storage circuit 104 releases energy to the second group 12.

[0163] In the second sub-state, the sixth and fifth operations are performed alternately. When the sixth operation is performed, the first lower bridge arm is turned on, the first upper bridge arm is turned off, and the second group 12, the first lower bridge arm, and the first energy tank circuit 104 form a loop. Current flows from the positive electrode of the second group 12 through the first lower bridge arm and the first energy tank circuit 104, and then flows back to the negative electrode of the second group 12. The first energy tank circuit 104 stores energy. When the fifth operation is performed, the first upper bridge arm is turned on, the first lower arm is turned off, and the first energy tank circuit 104, the first upper bridge arm, and the first group 11 form a loop. Current flows from the first energy tank circuit 104 through the positive electrode of the first group 11, the negative electrode of the first group 11, and the first upper bridge arm, and then flows back to the first energy tank circuit 104. In other words, the inductor releases energy to the first group 11.

[0164] In some embodiments, the first energy storage circuit 104 is an inductor.

[0165] In some embodiments, there may be multiple first bridge arms 20, and the multiple first bridge arms 20 are connected in parallel. The first energy tank circuit 104 includes multiple parallel first inductors L1, and the multiple first inductors L1 are connected one-to-one with the multiple first bridge arms 20. In some embodiments, the first energy tank circuit 104 may further include a second inductor L2, which is connected in series with the multiple parallel first inductors L1. The second end of the second inductor L2 is connected to the midpoint of the first bridge arm 20.

[0166] In the above technical solution, the first bridge arm 20 enables the two battery packs to form a charging and discharging loop with the first energy storage circuit 104 , thereby achieving depolarization of the batteries 101 connected in series.

[0167] According to some embodiments of the present application, the first module 102 also includes a second energy storage circuit, which is connected in parallel to both ends of the battery 101. The controller 105 is also configured to: in the first state, through the first bridge arm 20, execute the discharge of any one of the two battery packs whose voltage is greater than the first threshold to the second energy storage circuit and the discharge of the second energy storage circuit to the remaining other battery pack.

[0168] The second energy storage circuit is connected in parallel to both ends of the battery 101, and the first bridge arm 20 is also connected in parallel to both ends of the battery 101. That is, the second energy storage circuit is connected in parallel to the first bridge arm 20, and the first bridge arm 20 is connected to the first energy storage circuit 104. In this way, the second energy storage circuit can be connected to the midpoint of the two battery packs through the first bridge arm 20 and the first energy storage circuit 104, thereby enabling any battery pack with a voltage greater than the first threshold to discharge into the second energy storage circuit, and the second energy storage circuit 107 to discharge into the remaining battery pack.

[0169] For example, the battery pack of any one of the two battery packs whose voltage is greater than the first threshold is recorded as the first battery pack, and the remaining battery pack is recorded as the second battery pack. The controller 105 is configured to, in the first state, alternately perform at least one discharge of the first battery pack to the second energy storage circuit and the discharge of the second energy storage circuit to the second battery pack via the first bridge arm 20. In some embodiments, the controller 105 is further configured to, in the first state, alternately perform at least one discharge of the second battery pack to the second energy storage circuit and the discharge of the second energy storage circuit to the first battery pack via the first bridge arm 20.

[0170] In some embodiments, the controller 105 is configured to simultaneously execute the first battery pack discharging into the first energy storage circuit 104 and the first battery pack discharging into the second energy storage circuit via the first bridge arm 20, and / or simultaneously execute the first energy storage circuit 104 discharging into the second battery pack and the second energy storage circuit discharging into the second battery pack. The controller 105 may also be configured to: in the first state, simultaneously execute the second battery pack discharging into the first energy storage circuit 104 and the second battery pack discharging into the second energy storage circuit via the first bridge arm 20, and / or simultaneously execute the first energy storage circuit 104 discharging into the first battery pack and the second energy storage circuit discharging into the first battery pack.

[0171] In other embodiments, the controller 105 may also be configured to simultaneously execute the first battery pack to discharge into the first energy storage circuit 104 and the second energy storage circuit to discharge into the second battery pack through the first bridge arm 20, and / or simultaneously execute the first energy storage circuit 104 to discharge into the second battery pack and the first battery pack to discharge into the second energy storage circuit. The controller 105 may also be configured to: in the first state, simultaneously execute the second battery pack to discharge into the first energy storage circuit 104 and the second energy storage circuit to discharge into the first battery pack through the first bridge arm 20, and / or simultaneously execute the first energy storage circuit 104 to discharge into the first battery pack and the second battery pack to discharge into the second energy storage circuit.

[0172] In some other embodiments, the controller 105 can also be configured to control the operations of discharging any one of the two battery packs whose voltage is greater than the first threshold to the second energy storage circuit and the second energy storage circuit to the remaining other battery pack, and the operations of discharging any one of the two battery packs whose voltage is greater than the first threshold to the first energy storage circuit 104 and the first energy storage circuit 104 to the remaining other battery pack are not performed simultaneously.

[0173] In some embodiments, the second energy storage circuit may include but is not limited to elements with charging and discharging functions such as inductors or capacitors.

[0174] In the above technical solution, the second energy storage circuit can also enable the battery pack with a voltage greater than the first threshold to discharge to another battery pack, thereby enhancing the discharge efficiency of the battery pack and improving the depolarization effect in the first state.

[0175] like Figure 13 As shown, according to some embodiments of the present application, any one of the two battery packs whose voltage is greater than the first threshold is recorded as the first battery pack, and the remaining other battery pack is recorded as the second battery pack.

[0176] The controller 105 is also configured to: in the first state, through the first bridge arm 20, simultaneously execute the first battery group discharging to the first energy storage circuit 104 and the second energy storage circuit 107 discharging to the second battery group, and simultaneously execute the first energy storage circuit 104 discharging to the second battery group and the first battery group discharging to the second energy storage circuit.

[0177] It is understood that in some embodiments, the controller 105 is configured to: in the first state, simultaneously execute the second battery pack to discharge into the first energy storage circuit 104 and the second energy storage circuit to discharge into the first battery pack, and simultaneously execute the first energy storage circuit 104 to discharge into the first battery pack and the second battery pack to discharge into the second energy storage circuit, through the first bridge arm 20. In this way, the first battery pack can be depolarized while maintaining the balance of charge between the first and second battery packs.

[0178] In some embodiments, the second energy tank circuit may include a capacitor C, and the first energy tank circuit 104 may include at least one inductor.

[0179] like Figure 13 As shown, the capacitor C is connected in parallel to both ends of the battery 101. During the period when the first battery pack forms a loop through the first bridge arm 20 and the inductor to discharge to the inductor, the capacitor C can serve as a substitute power source, and since the first bridge arm 20 and the inductor are connected, the capacitor C can form a loop with the second battery pack through the first bridge arm 20 and the inductor, thereby allowing the capacitor C to discharge to the second battery pack.

[0180] While the second battery pack forms a loop through the first bridge arm 20 and the inductor to discharge the inductor to the second battery pack, the capacitor C can form a loop with the first battery pack through the first bridge arm 20 and the inductor, thereby causing the first battery pack to discharge to the capacitor C.

[0181] Similarly, while the second battery pack forms a loop through the first bridge arm 20 and the inductor to discharge to the inductor, the capacitor C can form a loop with the first battery pack through the first bridge arm 20 and the inductor to discharge to the first battery pack.

[0182] While the first battery pack forms a loop through the first bridge arm 20 and the inductor to discharge the inductor to the first battery pack, the capacitor C can form a loop with the second battery pack through the first bridge arm 20 and the inductor to discharge the second battery pack to the capacitor C.

[0183] In the above technical solution, the first battery group can discharge the second battery group simultaneously through the first energy storage circuit 104 and the second energy storage circuit 107, which can increase the discharge amount of the first battery group in a short time, further improve the discharge efficiency of the first battery group, and thus further improve the depolarization effect in the first state.

[0184] An embodiment of the present application provides a battery system, which includes the battery control circuit in the above embodiment.

[0185] The battery system includes a battery 101 connected to a battery control circuit. The battery system has the beneficial effects of the battery control circuit provided in the embodiments of the present application. For details, please refer to the detailed description of the battery control circuit in the above embodiments, which will not be repeated here.

[0186] An embodiment of the present application provides an electrical device, which includes the battery system in the above embodiment, and the battery system is used to provide electrical energy.

[0187] For the electrical device, reference may be made to the relevant description in the above embodiments, which will not be described in detail below.

[0188] like Figure 14 As shown, an embodiment of the present application provides a battery charging control method, wherein a battery 101 includes two battery packs connected to each other, the battery 101 is connected to a first module 102, and the first module 102 includes a switch circuit 103 and a first energy storage circuit 104 connected to the switch circuit 103. The method includes:

[0189] Step 110, obtaining the voltage of the battery pack during charging;

[0190] Step 120 , in response to the voltage of at least one battery pack being greater than a first threshold, controlling the battery 101 to switch from a charging state to a first state through the first module 102 , the first state including: executing mutual discharge of the two battery packs through the first module 102 .

[0191] For the structures of the battery 101 and the first module 102 , reference may be made to the relevant descriptions in the above embodiments, which will not be repeated here.

[0192] In step 110 , the method for obtaining the voltage of the battery pack during charging can refer to the relevant description in the above embodiment, which will not be repeated below.

[0193] Step 120 may be executed by the controller 105 in the above embodiment. The method for setting the first threshold and the method related to step 120 may refer to the relevant description in the above embodiment and will not be repeated below.

[0194] Any one of the two battery groups whose voltage is greater than the first threshold is recorded as the first battery group, and the remaining battery group is recorded as the second battery group. In step 120, the first state may include a first sub-state and a second sub-state. The first sub-state may include: executing the first battery group discharging to the first energy storage circuit 104 and the first energy storage circuit 104 discharging to the second battery group.

[0195] The second sub-state includes: executing the discharge of the second battery pack into the first energy storage circuit 104 and the discharge of the first energy storage circuit 104 into the first battery pack.

[0196] In some embodiments, the battery 101 can be controlled to alternate between the first sub-state and the second sub-state repeatedly. The number of alternations can be set in advance based on the type of battery 101 and the first threshold. For example, the battery 101 can alternate between the first sub-state and the second sub-state M times, where M is an integer greater than 1. After the battery 101 alternates between the first sub-state and the second sub-state M times, the voltage of each battery pack is less than or equal to the first threshold.

[0197] In the above technical solution, the discharge of the battery pack with a voltage greater than the first threshold can be achieved, the polarization voltage of the battery pack can be reduced, and the polarization phenomenon of the battery pack can be improved, so that the high current charging of the battery 101 can be maintained and the charging efficiency of the battery 101 can be improved.

[0198] like Figure 10 As shown, according to some embodiments of the present application, any one of the two battery groups whose voltage is greater than the first threshold is recorded as the first battery group, and the remaining other battery group is recorded as the second battery group, and the first state also includes: repeating N1 times the operation of discharging the first battery group to the first energy storage circuit 104 and discharging the first energy storage circuit 104 to the second battery group, N1 is an integer greater than 1; and / or, repeating N2 times the operation of discharging the second battery group to the first energy storage circuit and discharging the first energy storage circuit to the first battery group, N2 is an integer greater than 1.

[0199] For the definitions of the first battery pack and the second battery pack, reference may be made to the relevant description of the above embodiment, which will not be repeated here.

[0200] Regarding the method of repeatedly performing N1 times of discharging the first battery pack to the first energy storage circuit 104 and the first energy storage circuit 104 to the second battery pack, and / or repeatedly performing N2 times of discharging the second battery pack to the first energy storage circuit and the first energy storage circuit to the first battery pack, as well as the method of setting the values ​​of N1 and N2, please refer to the relevant description of the above embodiments and will not be repeated below.

[0201] like Figure 4 and Figure 15 As shown, according to some embodiments of the present application, the positive and negative electrodes of the battery 101 are also respectively connected to an external charging device 106, and the negative electrodes of the two battery packs are connected. The switching circuit 103 includes: a first switch K1, and the first switch K1 is connected to the positive electrodes of the two battery packs; a first bridge arm 20, and the two ends of the first bridge arm 20 are respectively connected to the positive electrode and the negative electrode of one of the battery packs, and the midpoint of the first bridge arm 20 is connected to the first end of the first energy storage circuit 104; a second bridge arm 21, and the first end of the second bridge arm 21 is connected to the second end of the first energy storage circuit 104, and the second end of the second bridge arm 21 is connected to the positive electrode of the other battery pack.

[0202] Step 120 includes: in response to the voltage of the battery pack being greater than a first threshold during charging, controlling the first switch K1 to be disconnected, and placing the battery 101 in the first state via the first bridge arm 20 , the second bridge arm 21 and the first energy storage circuit 104 .

[0203] The method further includes: step 130 , in response to the voltages of the two battery packs being less than or equal to a first threshold, controlling the first switch K1 to be closed, so that the charging device 106 charges the battery 101 .

[0204] For the structures and connection methods of the charging device 106 , the first switch K1 , the first bridge arm 20 and the second bridge arm 21 , reference may be made to the relevant descriptions in the above embodiments, which will not be repeated here.

[0205] For the specific methods of step 120 and step 130, reference may be made to the relevant descriptions in the above-mentioned relevant embodiments, which will not be repeated here.

[0206] In the above technical solution, when it is detected that the voltage of either the first battery pack or the second battery pack is greater than the first threshold, the first switch K1 is disconnected, allowing the first battery pack and the second battery pack to form a charging and discharging circuit through the first bridge arm 20 and the second bridge arm 21, respectively, thereby depolarizing the battery 101. In this way, the battery 101 can be switched between the charging state and the first state by turning the first switch K1 on and off.

[0207] like Figure 10As shown, according to some embodiments of the present application, the two battery groups include: a first group 11 and a second group 12, the first bridge arm 20 includes: a first upper bridge arm and a first lower bridge arm, the first upper bridge arm and the first lower bridge arm are respectively connected to the positive pole and the negative pole of the first group 11, and the second bridge arm 21 includes: a second upper bridge arm and a second lower bridge arm, the second upper bridge arm and the second lower bridge arm are respectively connected to the positive pole and the negative pole of the second group 12.

[0208] Step 120 includes: alternately performing the first operation and the second operation so that the first group 11 discharges to the first energy storage circuit 104 and the first energy storage circuit 104 discharges to the second group 12; alternately performing the third operation and the fourth operation so that the second group 12 discharges to the first energy storage circuit 104 and the first energy storage circuit 104 discharges to the first group 11.

[0209] The first operation includes: controlling the first upper bridge arm and the second lower bridge arm to be turned on, and the first lower bridge arm and the second upper bridge arm to be turned off.

[0210] The second operation includes: controlling the first upper bridge arm and the second upper bridge arm to be turned on, and the first lower bridge arm and the second lower bridge arm to be turned off.

[0211] The third operation includes: controlling the first lower bridge arm and the second upper bridge arm to be turned on, and controlling the first upper bridge arm and the second lower bridge arm to be turned off.

[0212] The fourth operation includes: controlling the first upper bridge arm and the second upper bridge arm to be turned on, and controlling the first lower bridge arm and the second lower bridge arm to be turned off.

[0213] For the definitions of the first group 11 and the second group 12 , reference may be made to the relevant description in the above embodiments, which will not be repeated here.

[0214] For the structures of the first upper bridge arm, the first lower bridge arm, the second upper bridge arm and the second lower bridge arm and the connection method between them and the battery pack, reference can be made to the relevant description in the above embodiments, which will not be repeated below.

[0215] Regarding the specific method and principle of performing the first operation, the second operation, the third operation and the fourth operation to put the battery 101 in the first state, reference may be made to the relevant description in the above embodiment, which will not be repeated below.

[0216] In some embodiments, the first energy storage circuit 104 includes an inductor. When the battery 101 is controlled to alternate between the first sub-state and the second sub-state, the inductor satisfies a volt-second product balance. In other words, in consecutive first and second sub-states, the volt-second product of the inductor in the first sub-state is equal to the volt-second product of the inductor in the second sub-state.

[0217] The volt-second product is the voltage across the inductor multiplied by the conduction time. The volt-second product of the inductor in the first sub-state is the voltage across the inductor during the first heating phase multiplied by the duration of the first sub-state. The volt-second product of the inductor in the second sub-state is the voltage across the inductor during the second sub-state multiplied by the duration of the second sub-state.

[0218] In the case of volt-second product balance, the energy transferred by the inductor in the first sub-state and the energy transferred by the inductor in the second sub-state are made the same, thereby maintaining energy balance between the two battery packs.

[0219] Moreover, under the condition that the volt-second product balance is satisfied, the duration of the first sub-state may be inconsistent with the duration of the second sub-state, and the current passing through the inductor in the first sub-state may also be inconsistent with the current passing through the inductor in the second sub-state, thereby simplifying the control method for depolarizing the battery 101.

[0220] In the above technical solution, during the process of the first energy storage circuit 104 discharging from the second battery pack 12, the first energy storage circuit 104, the first battery pack, and the second battery pack can form a loop, and the first battery pack can continuously discharge from the first energy storage circuit 104, further enhancing the depolarization effect on the first battery pack. Similarly, during the process of the first energy storage circuit 104 discharging from the first battery pack, the first energy storage circuit 104, the first battery pack, and the second battery pack can form a loop, and the second battery pack can continuously discharge from the first energy storage circuit 104, enhancing the depolarization effect on the second battery pack.

[0221] like Figure 10 As shown, according to some embodiments of the present application, the first module 102 also includes a second energy storage circuit 107, and the second energy storage circuit 107 is connected in parallel to the two ends of the first bridge arm 20. The first state also includes: through the switching circuit 103, executing the discharge of any one of the two battery packs whose voltage is greater than the first threshold to the second energy storage circuit 107 and the discharge of the second energy storage circuit 107 to the remaining other battery pack.

[0222] Regarding the structure of the second energy storage circuit 107 and the method of discharging any one of the two battery packs whose voltage is greater than the first threshold to the second energy storage circuit 107 and the method of discharging the second energy storage circuit 107 to the remaining other battery pack through the switching circuit 103, reference can be made to the relevant description in the above embodiments, and no further details will be given below.

[0223] In the above technical solution, the second energy storage circuit 107 can also enable the battery pack with a voltage greater than the first threshold to discharge to another battery pack, thereby enhancing the discharge efficiency of the battery pack and improving the depolarization effect in the first state.

[0224] like Figure 10As shown, according to some embodiments of the present application, the two battery groups include: a first group 11 and a second group 12, the first group 11 is connected to the first bridge arm 20, and the first state further includes: through the switching circuit 103, the first group 11 discharges to the first energy storage circuit 104 and the first group 11 discharges to the second energy storage circuit 107 at the same time, and the first energy storage circuit 104 discharges to the second group 12 and the second energy storage circuit 107 discharges to the second group 12 at the same time; and / or, through the switching circuit 103, the second group 12 discharges to the first energy storage circuit 104 and the first group 11 discharges to the second energy storage circuit 107 at the same time, and the first energy storage circuit 104 discharges to the first group 11 and the second energy storage circuit 107 discharges to the first group 11 at the same time.

[0225] Exemplarily, the first energy storage circuit 104 includes at least one inductor, and the second energy storage circuit 107 includes a capacitor C. The specific implementation method and principle can refer to the relevant description in the above embodiment, which will not be repeated below.

[0226] In the above technical solution, the discharge amount of the first group 11 in a short period of time can be increased, the discharge efficiency of the first group 11 can be improved, and thus the depolarization effect in the first state can be further improved.

[0227] like Figure 12 As shown, according to some embodiments of the present application, the positive electrode and the negative electrode of the battery 101 are further connected to an external charging device 106, respectively, and the two battery packs are connected in series. The switch circuit 103 includes: a first bridge arm 20, a first end of the first bridge arm 20 is connected to the positive electrode of the battery 101, and a second end is connected to the negative electrode of the battery 101, wherein the midpoint of the first bridge arm 20 is connected to the first end of the first energy storage circuit 104, and the second end of the first energy storage circuit 104 is connected between the two battery packs.

[0228] The method further includes: in response to the voltages of the two battery packs being less than or equal to the first threshold, controlling the charging device 106 to charge the battery 101 .

[0229] Step 120 includes: in response to the voltage of at least one of the two battery packs being greater than a first threshold, placing the battery 101 in a first state via the first bridge arm 20 and the first energy storage circuit 104 .

[0230] Regarding the connection method between the first bridge arm 20, the first energy storage circuit 104 and the two battery packs, as well as the specific method of controlling the charging device 106 to charge the battery 101 and placing the battery 101 in the first state through the above-mentioned first bridge arm 20 and the first energy storage circuit 104, reference can be made to the relevant description in the above-mentioned embodiments, and will not be repeated here.

[0231] In the above technical solution, the first bridge arm 20 enables the first battery group and the second battery group to form a charging and discharging loop with the first energy storage circuit 104 , thereby achieving depolarization of the batteries 101 connected in series.

[0232] like Figure 13 As shown, according to some embodiments of the present application, when two battery packs are connected in series and the switching circuit 103 includes a first bridge arm 20, the first module 102 also includes a second energy storage circuit, and the second energy storage circuit is connected in parallel to both ends of the battery 101. The first state also includes: through the first bridge arm 20, executing the discharge of any one of the two battery packs whose voltage is greater than the first threshold to the second energy storage circuit and the discharge of the second energy storage circuit to the remaining other battery pack.

[0233] For details about the structure of the second energy storage circuit 107 and the above method, reference may be made to the relevant description in the above embodiments, which will not be repeated below.

[0234] In the above technical solution, the second energy storage circuit can also enable the battery pack with a voltage greater than the first threshold to discharge to another battery pack, thereby enhancing the discharge efficiency of the battery pack and improving the depolarization effect in the first state.

[0235] like Figure 10 As shown, according to some embodiments of the present application, any one of the two battery packs whose voltage is greater than the first threshold is recorded as the first battery pack, and the remaining other battery pack is recorded as the second battery pack.

[0236] When two battery packs are connected in series and the switching circuit 103 includes a first bridge arm 20, the first state also includes: through the first bridge arm 20, simultaneously executing the first battery pack discharging to the first energy storage circuit 104 and the second energy storage circuit 107 discharging to the second battery pack, and simultaneously executing the first energy storage circuit 104 discharging to the second battery pack and the first battery pack discharging to the second energy storage circuit.

[0237] Exemplarily, the first energy storage circuit 104 includes at least one inductor, and the second energy storage circuit includes a capacitor C. The specific implementation method and principle can refer to the relevant description in the above embodiment, which will not be repeated below.

[0238] In the above technical solution, the discharge capacity of the first battery pack in a short period of time can be increased, and the discharge efficiency of the first battery pack can be further improved, thereby further improving the depolarization effect in the first state.

[0239] An embodiment of the present application provides a battery control circuit, wherein the positive and negative electrodes of a battery 101 are respectively connected to an external charging device 106, wherein the negative electrodes of the two battery packs are connected, and the battery control circuit includes: a first switch K1, wherein the first switch K1 is connected to the positive electrodes of the two battery packs; a first bridge arm 20, wherein the two ends of the first bridge arm 20 are respectively connected to the positive electrode and the negative electrode of one of the battery packs; a second bridge arm 21, wherein the two ends of the second bridge arm 21 are respectively connected to the positive electrode and the negative electrode of the other battery pack; a first energy storage circuit 104, wherein the two ends of the first energy storage circuit 104 are respectively connected to the midpoint of the first bridge arm 20 and the midpoint of the second bridge arm 21; a controller 105, configured to: in response to the voltages of the two battery packs being less than or equal to a first threshold, control the first switch K1 to be closed so that the charging device 106 charges the battery 101; in response to the voltage of the battery pack being greater than the first threshold during charging, control the first switch K1 to be disconnected, and put the battery 101 into a first state through the first bridge arm 20, the second bridge arm 21 and the first energy storage circuit 104.

[0240] The first state includes a first sub-state and a second sub-state, and the controller 105 controls the battery 101 to alternately and repeatedly be in the first sub-state and the second sub-state. In the first sub-state, the first bridge arm 20 and the second bridge arm 21 repeatedly perform N1 times of discharge from the first battery pack to the first energy storage circuit 104 and the first energy storage circuit 104 to the second battery pack, where N1 is an integer greater than 1. In the second sub-state, the first bridge arm 20 and the second bridge arm 21 repeatedly perform N2 times of discharge from the second battery pack to the first energy storage circuit 104 and the first energy storage circuit 104 to the first battery pack, where N2 is an integer greater than 1.

[0241] The first bridge arm 20 includes a first upper bridge arm and a first lower bridge arm, the first upper bridge arm and the first lower bridge arm being connected to the positive electrode and the negative electrode of the first group 11, respectively. The second bridge arm 21 includes a second upper bridge arm and a second lower bridge arm, the second upper bridge arm and the second lower bridge arm being connected to the positive electrode and the negative electrode of the second group 12, respectively. The controller 105 is configured to alternately perform a first operation and a second operation to place the battery 101 in the first sub-state, and alternately perform a third operation and a fourth operation to place the battery 101 in the second sub-state. The first operation includes controlling the first upper bridge arm and the second lower bridge arm to be turned on, and the first lower bridge arm and the second upper bridge arm to be turned off; the second operation includes controlling the first upper bridge arm and the second upper bridge arm to be turned on, and the first lower bridge arm and the second lower arm to be turned off; the third operation includes controlling the first lower bridge arm and the second upper bridge arm to be turned on, and the first upper bridge arm and the second lower arm to be turned off; and the fourth operation includes controlling the first upper bridge arm and the second upper bridge arm to be turned on, and the first lower bridge arm and the second lower arm to be turned off.

[0242] The first module 102 further includes a capacitor C, which is connected in parallel to both ends of the first bridge arm 20 .

[0243] The first energy storage circuit 104 includes at least one inductor, wherein in a first state, the inductor satisfies a volt-second product balance.

[0244] 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 make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions 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 battery control circuit, characterized in that: include: a first module connected to the battery, the first module comprising a switch circuit and a first energy storage circuit connected to the switch circuit, the battery comprising two battery packs connected to each other; The controller is configured as: obtaining the voltage of the battery pack during charging, and in response to the voltage of at least one of the battery packs being greater than a first threshold, controlling the battery to switch from a charging state to a first state through the first module; The first state includes: The two battery packs are discharged from each other through the first module; wherein, The first state includes a first sub-state and a second sub-state. In response to the voltage of at least one of the two battery packs being greater than the first threshold, the controller controls the battery to be in the first sub-state and the second sub-state. In the first sub-state, the battery pack with a voltage greater than the first threshold discharges to the remaining other battery pack through the first energy storage circuit; in the second sub-state, the remaining other battery pack discharges to the battery pack with a voltage greater than the first threshold through the first energy storage circuit, thereby realizing energy transfer between the two battery packs.

2. The battery control circuit according to claim 1, characterized in that: Any one of the two battery packs whose voltage is greater than the first threshold is recorded as a first battery pack, and the remaining other battery pack is recorded as a second battery pack. The controller is further configured to: In the first state, the switching circuit repeatedly performs N1 operations of discharging the first battery pack into the first energy storage circuit and discharging the first energy storage circuit into the second battery pack, where N1 is an integer greater than 1; and / or In the first state, the switching circuit repeatedly performs N2 operations of discharging the second battery pack into the first energy storage circuit and discharging the first energy storage circuit into the first battery pack, where N2 is an integer greater than 1.

3. The battery control circuit according to claim 1 or 2, characterized in that: The positive electrode and negative electrode of the battery are also connected to an external charging device respectively, and the negative electrodes of the two battery packs are connected. The switching circuit includes: a first switch, the first switch connecting the positive electrodes of the two battery packs; a first bridge arm, wherein two ends of the first bridge arm are respectively connected to the positive electrode and the negative electrode of one of the battery packs, and a midpoint of the first bridge arm is connected to the first end of the first energy storage circuit; a second bridge arm, wherein two ends of the second bridge arm are respectively connected to the positive electrode and the negative electrode of the other battery pack, and the second end of the first energy storage circuit is connected to the midpoint of the second bridge arm; The controller is further configured to: In response to the voltages of the two battery packs being less than or equal to the first threshold, controlling the first switch to be closed so that the charging device charges the battery; In response to the voltage of the battery pack being greater than the first threshold during charging, the first switch is controlled to be disconnected, and the battery is placed in the first state through the first bridge arm, the second bridge arm, and the first energy storage circuit.

4. The battery control circuit according to claim 3, characterized in that: The two battery packs include: a first group and a second group, The first bridge arm includes: a first upper bridge arm and a first lower bridge arm, wherein the first upper bridge arm and the first lower bridge arm are respectively connected to the positive electrode and the negative electrode of the first group. The second bridge arm includes: a second upper bridge arm and a second lower bridge arm, wherein the second upper bridge arm and the second lower bridge arm are respectively connected to the positive electrode and the negative electrode of the second group. The controller is configured to: Alternatingly performing a first operation and a second operation so that the first group discharges into the first energy storage circuit and the first energy storage circuit discharges into the second group; The third operation and the fourth operation are alternately performed so that the second group discharges to the first energy storage circuit and the first energy storage circuit discharges to the first group, wherein The first operation includes: controlling the first upper bridge arm and the second lower bridge arm to be turned on, and the first lower bridge arm and the second upper bridge arm to be turned off; The second operation includes: controlling the first upper bridge arm and the second upper bridge arm to be turned on, and the first lower bridge arm and the second lower bridge arm to be turned off; The third operation includes: controlling the first lower bridge arm and the second upper bridge arm to be turned on, and the first upper bridge arm and the second lower bridge arm to be turned off; The fourth operation includes: controlling the first upper bridge arm and the second upper bridge arm to be turned on, and the first lower bridge arm and the second lower bridge arm to be turned off.

5. The battery control circuit according to claim 3, characterized in that: The first module further includes a second energy storage circuit, which is connected in parallel to two ends of the first bridge arm. The controller is further configured to: In the first state, the switching circuit is used to discharge the battery pack whose voltage is greater than the first threshold value from the two battery packs to the second energy storage circuit, and the second energy storage circuit to the remaining battery pack.

6. The battery control circuit according to claim 5, characterized in that: The two battery packs include: a first group and a second group, the first group is connected to the first bridge arm, and the controller is further configured to: In the first state, the first group discharges into the first energy storage circuit and the first group discharges into the second energy storage circuit simultaneously, and the first energy storage circuit discharges into the second group and the second energy storage circuit discharges into the second group simultaneously through the switching circuit; and / or In the first state, the second group discharges into the first tank circuit and the first group discharges into the second tank circuit simultaneously, and the first tank circuit discharges into the first group and the second tank circuit discharges into the first group simultaneously through the switch circuit.

7. The battery control circuit according to claim 5, characterized in that: The first energy storage circuit includes at least one inductor, and the second energy storage circuit includes a capacitor.

8. The battery control circuit according to claim 1 or 2, characterized in that: The positive electrode and negative electrode of the battery are also connected to an external charging device respectively, and the two battery packs are connected in series. The switching circuit includes: a first bridge arm, wherein a first end of the first bridge arm is connected to the positive electrode of the battery, and a second end of the first bridge arm is connected to the negative electrode of the battery, wherein a midpoint of the first bridge arm is connected to the first end of the first energy storage circuit, and a second end of the first energy storage circuit is connected between the two battery packs; The controller is further configured to: In response to the voltages of the two battery packs being less than or equal to the first threshold, controlling the charging device to charge the battery; In response to the voltage of at least one of the two battery packs being greater than the first threshold, the battery is placed in the first state via the first bridge arm and the first energy storage circuit.

9. The battery control circuit according to claim 8, characterized in that: The first module further includes a second energy storage circuit, which is connected in parallel to both ends of the battery. The controller is further configured to: In the first state, the first bridge arm is used to discharge any one of the two battery packs whose voltage is greater than the first threshold to the second energy storage circuit, and the second energy storage circuit to the remaining battery pack.

10. The battery control circuit according to claim 9, characterized in that: Any one of the two battery packs whose voltage is greater than the first threshold is recorded as a first battery pack, and the remaining other battery pack is recorded as a second battery pack. The controller is further configured to: In the first state, through the first bridge arm, the first battery pack discharges to the first energy storage circuit and the second energy storage circuit discharges to the second battery pack, and the first energy storage circuit discharges to the second battery pack and the first battery pack discharges to the second energy storage circuit.

11. A battery system, characterized in that: The battery control circuit comprises the battery control circuit according to any one of claims 1 to 10.

12. An electrical device, characterized in that: The battery system according to claim 11 is provided to supply power to the electrical device.

13. A battery charging control method, characterized in that: The battery includes two battery packs connected to each other, the battery is connected to a first module, the first module includes a switch circuit and a first energy storage circuit connected to the switch circuit, and the method includes: obtaining a voltage of the battery pack during charging; In response to a voltage of at least one of the battery packs being greater than a first threshold, the first module controls the battery to switch from a charging state to a first state, where the first state includes: The two battery packs are discharged from each other through the first module; wherein, The first state includes a first sub-state and a second sub-state, and controlling the battery to switch from the charging state to the first state through the first module includes: In response to the voltage of at least one of the two battery packs being greater than the first threshold, the battery is controlled to be in a first sub-state and a second sub-state. In the first sub-state, the battery pack with a voltage greater than the first threshold discharges to the remaining other battery pack through the first energy storage circuit; in the second sub-state, the remaining other battery pack discharges to the battery pack with a voltage greater than the first threshold through the first energy storage circuit, thereby realizing energy transfer between the two battery packs.

14. The method according to claim 13, characterized in that The battery pack of any one of the two battery packs whose voltage is greater than the first threshold is recorded as the first battery pack, and the remaining battery pack is recorded as the second battery pack. The first state further includes: Repeating N1 times the operation of discharging the first battery pack into the first energy storage circuit and discharging the first energy storage circuit into the second battery pack, where N1 is an integer greater than 1; and / or, The operation of discharging the second battery pack into the first energy storage circuit and discharging the first energy storage circuit into the first battery pack is repeated N2 times, where N2 is an integer greater than 1.

15. The method according to claim 13 or 14, characterized in that The positive and negative electrodes of the battery are further connected to an external charging device, respectively, and the negative electrodes of the two battery packs are connected. The switching circuit includes: a first switch, the first switch connecting the positive electrodes of the two battery packs; a first bridge arm, the two ends of the first bridge arm connecting the positive and negative electrodes of one of the battery packs, respectively, and the midpoint of the first bridge arm connecting to the first end of the first energy storage circuit; a second bridge arm, the two ends of the second bridge arm connecting the positive and negative electrodes of the other battery pack, respectively, and the second end of the first energy storage circuit connecting to the midpoint of the second bridge arm; The method further comprises: In response to the voltages of the two battery packs being less than or equal to the first threshold, controlling the first switch to be closed so that the charging device charges the battery; In response to the voltage of the battery pack being greater than the first threshold during charging, the first switch is controlled to be disconnected, and the battery is placed in the first state through the first bridge arm, the second bridge arm, and the first energy storage circuit.

16. The method according to claim 15, characterized in that The two battery packs include: a first group and a second group, the first bridge arm includes: a first upper bridge arm and a first lower bridge arm, the first upper bridge arm and the first lower bridge arm are respectively connected to the positive electrode and the negative electrode of the first group, the second bridge arm includes: a second upper bridge arm and a second lower bridge arm, the second upper bridge arm and the second lower arm are respectively connected to the positive electrode and the negative electrode of the second group; the first state includes: Alternatingly performing a first operation and a second operation so that the first group discharges into the first energy storage circuit and the first energy storage circuit discharges into the second group; The third operation and the fourth operation are alternately performed so that the second group discharges to the first energy storage circuit and the first energy storage circuit discharges to the first group, wherein The first operation includes: controlling the first upper bridge arm and the second lower bridge arm to be turned on, and the first lower bridge arm and the second upper bridge arm to be turned off; The second operation includes: controlling the first upper bridge arm and the second upper bridge arm to be turned on, and the first lower bridge arm and the second lower bridge arm to be turned off; The third operation includes: controlling the first lower bridge arm and the second upper bridge arm to be turned on, and the first upper bridge arm and the second lower bridge arm to be turned off; The fourth operation includes: controlling the first upper bridge arm and the second upper bridge arm to be turned on, and the first lower bridge arm and the second lower bridge arm to be turned off.

17. The method according to claim 15, characterized in that The first module further includes a second energy storage circuit, which is connected in parallel to both ends of the first bridge arm. The first state further includes: Through the switch circuit, any one of the two battery packs whose voltage is greater than the first threshold discharges to the second energy storage circuit, and the second energy storage circuit discharges to the remaining other battery pack.

18. The method according to claim 17, characterized in that The two battery packs include: a first group and a second group, the first group is connected to the first bridge arm, and the first state further includes: By means of the switching circuit, the first group is discharged into the first energy storage circuit and the first group is discharged into the second energy storage circuit at the same time, and the first energy storage circuit is discharged into the second group and the second energy storage circuit is discharged into the second group at the same time; and / or, Through the switching circuit, the second group discharges into the first energy storage circuit and the first group discharges into the second energy storage circuit simultaneously, and the first energy storage circuit discharges into the first group and the second energy storage circuit discharges into the first group simultaneously.

19. The method according to claim 13 or 14, characterized in that The positive electrode and negative electrode of the battery are also connected to an external charging device respectively, and the two battery packs are connected in series. The switching circuit includes: a first bridge arm, a first end of the first bridge arm is connected to the positive electrode of the battery, and a second end is connected to the negative electrode of the battery, wherein the midpoint of the first bridge arm is connected to the first end of the first energy storage circuit, and the second end of the first energy storage circuit is connected between the two battery packs. The method further comprises: In response to the voltages of the two battery packs being less than or equal to the first threshold, controlling the charging device to charge the battery; In response to the voltage of at least one of the two battery packs being greater than the first threshold, the battery is placed in the first state via the first bridge arm and the first energy storage circuit.

20. The method according to claim 19, characterized in that The first module further includes a second energy storage circuit, which is connected in parallel to both ends of the battery. The first state further includes: Through the first bridge arm, any one of the two battery packs whose voltage is greater than the first threshold discharges to the second energy storage circuit, and the second energy storage circuit discharges to the remaining other battery pack.

21. The method according to claim 20, characterized in that The battery pack of any one of the two battery packs whose voltage is greater than the first threshold is recorded as the first battery pack, and the remaining battery pack is recorded as the second battery pack. The first state further includes: Through the first bridge arm, the first battery pack discharges to the first energy storage circuit and the second energy storage circuit discharges to the second battery pack, and the first energy storage circuit discharges to the second battery pack and the first battery pack discharges to the second energy storage circuit.

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