Battery control circuit, battery system, electric device, and battery charging control method

Abstract

The present application relates to the technical field of batteries, and provides a battery control circuit, a battery system, an electric device, and a battery charging control method. The battery control circuit comprises: a first module connected to a battery, wherein the first module comprises a switch circuit and a first energy storage circuit connected to the switch circuit, and the battery comprises two battery packs connected to each other; and a controller configured to: acquire voltages of the battery packs during charging, and in response to the voltage of at least one battery pack being greater than a first threshold, control, by means of the first module, the battery to switch from a charging state to a first state, wherein the first state comprises: performing, by means of the first module, mutual discharging of the two battery packs. The battery control circuit of the present application can improve the charging efficiency of the battery.

Description

Battery control circuit, battery system, electric device and battery charging control method

[0001] Cross-reference to related applications

[0002] This application is related to the Chinese Patent Application No. 202510075245.9 entitled "Battery control circuit, battery system, electric device and battery charging control method" filed on January 17, 2025, which is incorporated by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of battery, and in particular, to a battery control circuit, a battery system, an electric device and a battery charging control method. BACKGROUND

[0004] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0005] During the charging or discharging process of the battery, due to the influence of the chemical reaction inside the battery and the movement of the current, polarization phenomenon may occur. This polarization phenomenon may cause the energy density of the battery to decrease, the charging time to become longer, and the charging efficiency of the battery to decrease. SUMMARY

[0006] The present application aims to at least solve one of the technical problems in the background art. To this end, one object of the present application is to provide a battery control circuit, a battery system, an electric device and a battery charging control method to solve the problem of low battery charging efficiency in the related art.

[0007] Embodiments of the first aspect of the present application provide 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, in response to the voltage of at least one battery pack being greater than a first threshold value, control the battery to switch from a charging state to a first state through the first module, the first state comprising: performing mutual discharging of the two battery packs through the first module.

[0008] In the technical solution of the embodiments of the present application, when the voltage of the battery pack is greater than the first threshold value, the polarization voltage of the battery pack can 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 value, the two battery packs are discharged by the first module, achieving the discharge of the battery pack with a voltage greater than the first threshold value. During the discharging process, the polarization voltage of the battery pack can be reduced, thereby improving the polarization phenomenon of the battery. In this way, the large 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 are discharged to each other, the energy is transferred between the two battery packs, so that the electric quantity of the two battery packs after discharging to each other is consistent or substantially consistent with the electric quantity before discharging to each other, improving the problem of power loss due to excessive discharge of any one of the battery packs, and being beneficial to improving the charging efficiency of the battery pack.

[0009] In some embodiments, any one of the two battery packs with a voltage greater than the first threshold value 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: in the first state, through the switching circuit, repeatedly perform the operation of discharging the first battery pack to the first energy storage circuit and discharging the first energy storage circuit to the second battery pack N1 times, N1 being an integer greater than 1; and / or in the first state, through the switching circuit, repeatedly perform the operation of discharging the second battery pack to the first energy storage circuit and discharging the first energy storage circuit to the first battery pack N2 times, N2 being an integer greater than 1. In this way, the first state can be maintained for a longer period of time, the discharge of the first battery pack can be enhanced, and the effect of depolarization of the first battery pack can be enhanced.

[0010] In some embodiments, the positive and negative terminals of the battery are also connected to an external charging device, and the negative terminals of the two battery packs are connected. The switching circuit includes: a first switch connected to the positive terminals of the two battery packs; a first bridge arm, the two ends of which are respectively connected to the positive and negative terminals of one battery pack, and the midpoint of the first bridge arm connected to a first terminal of a first energy storage circuit; a second bridge arm, the two ends of which are respectively connected to the positive and negative terminals of the other battery pack, and the second terminal of the first energy storage circuit connected to the midpoint of the second bridge arm; the controller is further configured to: control the first switch to close in response to the voltages of both battery packs being less than or equal to a first threshold, so that the charging device charges the battery; and control the first switch to open in response to the voltage of the battery pack being greater than the first threshold during charging, and put the battery in a first state through the first bridge arm, the second bridge arm, and the first energy storage circuit. When the voltages of both battery packs are less than the first threshold, there is no polarization or the polarization of the first and second battery packs is weak, and the charging efficiency of the battery is high at this time. During charging, the first switch is closed, the two battery packs are connected in parallel, and the voltages of the two battery packs are the same. When the voltage of either of the two battery packs exceeds a first threshold, the first switch is disconnected, meaning the two battery packs are no longer connected in parallel. This allows each battery pack to form its own charging and discharging circuit through the first and second bridge arms, thereby achieving battery depolarization. In other words, switching the battery's charging state and its first state can be achieved by turning the first switch on and off.

[0011] In some embodiments, the two battery packs include: a first group and a second group. A first bridge arm includes a first upper bridge arm and a first lower bridge arm, which are respectively connected to the positive and negative terminals of the first group. A second bridge arm includes a second upper bridge arm and a second lower bridge arm, which are respectively connected to the positive and negative terminals of the second group. The controller is configured to: alternately execute a first operation and a second operation to cause the first group to discharge to a first energy storage circuit and the first energy storage circuit to discharge to the second group; alternately execute a third operation and a fourth operation to... This allows the second energy storage circuit to discharge to the first energy storage circuit, and the first energy storage circuit to discharge to the first energy storage circuit. 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 turn off; 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 bridge arm to turn off; 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 bridge arm to turn off; 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 bridge arm to turn off. In this way, during the discharge process from the first energy storage circuit to the second energy storage circuit, the first energy storage circuit, the first energy storage circuit, and the second energy storage circuit can form a loop, allowing the first energy storage circuit to continuously discharge to the first energy storage circuit, further improving the depolarization effect on the first energy storage circuit. Furthermore, it can also ensure that the voltage of the first energy storage circuit and the first energy storage circuit connected in series is greater than the voltage of the second energy storage circuit, increasing the success rate of the first energy storage circuit successfully discharging to the second energy storage circuit. 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. The second group can continuously discharge to the first energy storage circuit, which improves the success rate of the first energy storage circuit discharging to the first group while improving the depolarization effect on the second group.

[0012] In some embodiments, the first module further includes a second energy storage circuit connected in parallel across the two ends of the first bridge arm. The controller is further configured to: in a first state, via a switching circuit, discharge either battery pack with a voltage greater than a first threshold to the second energy storage circuit, and discharge the second energy storage circuit to the remaining battery pack. The second energy storage circuit can also enable the battery pack with a voltage greater than the first threshold to discharge to the other battery pack, thereby enhancing the discharge efficiency of that battery pack and improving the depolarization effect in the first state.

[0013] In some embodiments, the two battery packs include a first pack and a second pack. The first pack is connected to a first bridge arm. The controller is further configured to: in a first state, simultaneously execute, via a switching circuit, the first pack discharging to a first energy storage circuit and the first pack discharging to a second energy storage circuit, and simultaneously execute, via a first energy storage circuit discharging to the second pack and the second energy storage circuit discharging to the second pack; and / or in the first state, simultaneously execute, via a switching circuit, the second pack discharging to the first energy storage circuit and the first pack discharging to the second energy storage circuit, and simultaneously execute, via a first energy storage circuit discharging to the first pack and the second energy storage circuit discharging to the first pack. That is, the first pack can simultaneously discharge to the second pack via the first and second energy storage circuits, and / or during the discharge of the first pack via the first energy storage circuit, the first pack can exchange energy with the second energy storage circuit, increasing the discharge capacity of the first pack in a short time, improving the discharge efficiency of the first pack, and thus further improving the depolarization effect in the first state.

[0014] 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, improving the energy transfer efficiency between battery packs, thereby giving the battery a better depolarization effect. The capacitor has a small size and can achieve rapid charging and discharging, further improving the battery depolarization effect while keeping the battery control circuit small, reducing its weight, and lowering costs.

[0015] In some embodiments, the positive and negative terminals of the battery are also connected to an external charging device, and the two battery packs are connected in series. The switching circuit includes a first bridge arm, a first end of which is connected to the positive terminal of the battery, and a second end of which is connected to the negative terminal of the battery. The midpoint of the first bridge arm is connected to a first end of a 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: control the charging device to charge the battery in response to the voltage of both battery packs being less than or equal to a first threshold; and to put the battery in a first state through the first bridge arm and the first energy storage circuit in response to the voltage of at least one of the two battery packs being greater than the first threshold. Through the first bridge arm, the two battery packs can each form a charging and discharging loop with the first energy storage circuit, thereby achieving depolarization of the series-connected batteries.

[0016] In some embodiments, the first module further includes a second energy storage circuit connected in parallel across the two ends of the battery. The controller is further configured to: in a first state, via the first bridge arm, discharge either battery pack with a voltage greater than a first threshold to the second energy storage circuit, and discharge the second energy storage circuit to the remaining battery pack. The second energy storage circuit can also enable the battery pack with a voltage 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.

[0017] In some embodiments, the battery pack whose voltage is greater than a first threshold is designated as the first battery pack, and the remaining battery pack is designated as the second battery pack. The controller is further configured to simultaneously execute the discharge of the first battery pack to the first energy storage circuit and the discharge of the second energy storage circuit to the second battery pack via the first bridge arm, as well as simultaneously execute the discharge of the first energy storage circuit to the second battery pack and the discharge of the first battery pack to the second energy storage circuit. That is, the first battery pack can simultaneously discharge to the second battery pack via the first energy storage circuit and the second energy storage circuit, which can increase the discharge capacity of the first battery pack in a short time, further improve the discharge efficiency of the first battery pack, and thus further improve the depolarization effect in the first state.

[0018] An embodiment of the second aspect of this application provides a battery system that includes the battery control circuit described in the above embodiments.

[0019] An embodiment of the third aspect of this application provides an electrical device that includes the battery system described in the above embodiments, the battery system being used to provide electrical energy.

[0020] An embodiment of the fourth aspect of this application provides a battery charging control method. The battery includes two battery packs connected to each other. The battery is connected to a first module, which includes a switching circuit and a first energy storage circuit connected to the switching circuit. The method includes: acquiring the voltage of the battery packs during charging; and, in response to the voltage of at least one battery pack being greater than the first threshold, controlling the battery to switch from a charging state to a first state via the first module. The first state includes: discharging the two battery packs to each other via the first module. This enables the discharge of battery packs with voltages greater than the first threshold, reducing the polarization voltage of the battery packs, improving the polarization phenomenon of the battery packs, thereby maintaining high-current charging of the battery and improving the charging efficiency of the battery.

[0021] In some embodiments, the battery pack with a voltage greater than a first threshold is designated as the first battery pack, and the remaining battery pack is designated as the second battery pack. The first state further includes: repeatedly performing the operation of discharging the first battery pack to the first energy storage circuit and the first energy storage circuit discharging to the second battery pack N1 times, where N1 is an integer greater than 1; and / or, repeatedly performing the operation of discharging the second battery pack to the first energy storage circuit and the first energy storage circuit discharging to the first battery pack N2 times, 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 the battery pack with a voltage greater than the first threshold, thereby enhancing the depolarization effect on the first battery pack.

[0022] In some embodiments, the positive and negative terminals of the battery are also connected to an external charging device, and the negative terminals of the two battery packs are connected. The switching circuit includes: a first switch connected to the positive terminals of the two battery packs; a first bridge arm, the two ends of which are respectively connected to the positive and negative terminals of one battery pack, and the midpoint of the first bridge arm connected to a first terminal of a first energy storage circuit; and a second bridge arm, the two ends of which are respectively connected to the positive and negative terminals of the other battery pack, and the second terminal of the first energy storage circuit connected to the midpoint of the second bridge arm. The method further includes: controlling the first switch to close in response to the voltage of both battery packs being less than or equal to a first threshold, so that the charging device charges the battery; controlling the first switch to open in response to the voltage of the battery pack being greater than the first threshold during charging, and putting the battery in a first state through the first bridge arm, the second bridge arm, and the first energy storage circuit. When it is detected that the voltage of either of the two battery packs is greater than the first threshold, the first switch is opened, so that the two battery packs can form charging and discharging circuits respectively through the first bridge arm and the second bridge arm, thereby achieving depolarization of the battery. In this way, the switching between the charging state and the first state of the battery can be achieved by opening and closing the first switch.

[0023] 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 being respectively connected to the positive and negative terminals 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 being respectively connected to the positive and negative terminals of the second group; a first state includes: alternately performing a first operation and a second operation, such that the first group discharges to the first energy storage circuit and the first energy storage circuit discharges to the second group; alternately performing a third operation and a fourth operation, such that... The second group discharges to the first energy storage circuit, and the first energy storage circuit discharges to 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 turn off; 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 bridge arm to turn off; 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 bridge arm to turn off; 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 bridge arm to turn off. Thus, during the discharge process from the first energy storage circuit to the second group, the first energy storage circuit, the first group, and the second group can form a loop, allowing the first group to continuously discharge to the first energy storage circuit, further enhancing the depolarization effect on the first group. Similarly, during the discharge process from the first energy storage circuit to the first group, the first energy storage circuit, the first group, and the second group can form a loop, allowing the second group to continuously discharge to the first energy storage circuit, enhancing the depolarization effect on the second group.

[0024] 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: via a switching circuit, discharging either battery pack with a voltage greater than a first threshold to the second energy storage circuit, and the second energy storage circuit discharging to the remaining battery pack. The second energy storage circuit can also enable the battery pack with a voltage 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.

[0025] In some embodiments, the two battery packs include a first pack and a second pack, the first pack being connected to a first bridge arm. The first state further includes: simultaneously executing, via a switching circuit, the first pack discharging to a first energy storage circuit and the first pack discharging to a second energy storage circuit, and simultaneously executing, the first energy storage circuit discharging to the second pack and the second energy storage circuit discharging to the second pack; and / or, simultaneously executing, via a switching circuit, the second pack discharging to the first energy storage circuit and the first pack discharging to the second energy storage circuit, and simultaneously executing, the first energy storage circuit discharging to the first pack and the second energy storage circuit discharging to the first pack. This increases the discharge capacity of the first pack in a short time, improves the discharge efficiency of the first pack, and further enhances the depolarization effect in the first state.

[0026] In some embodiments, the positive and negative terminals of the battery are also connected to an external charging device, and the two battery packs are connected in series. The switching circuit includes a first bridge arm, a first end of which is connected to the positive terminal of the battery, and a second end of which is connected to the negative terminal of the battery. The midpoint of the first bridge arm is connected to a first end of a first energy storage circuit, and a second end of the first energy storage circuit is connected between the two battery packs. The method further includes: controlling the charging device to charge the battery in response to the voltage of both battery packs being less than or equal to a first threshold; and setting the battery to a first state through the first bridge arm and the first energy storage circuit in response to the voltage of at least one of the two battery packs being greater than the first threshold. Through the first bridge arm, the two battery packs can each form a charging and discharging circuit with the first energy storage circuit, thereby achieving depolarization of the series-connected batteries.

[0027] In some embodiments, the first module further includes a second energy storage circuit connected in parallel across the two ends of the battery. The first state further includes: through the first bridge arm, discharging any one of the two battery packs with a voltage greater than a first threshold to the second energy storage circuit, and the second energy storage circuit discharging to the remaining battery pack. The second energy storage circuit can also enable the battery pack with a voltage 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.

[0028] In some embodiments, the battery pack whose voltage is greater than a first threshold is designated as the first battery pack, and the remaining battery pack is designated as the second battery pack. The first state further includes: simultaneously executing the first battery pack discharging to the first energy storage circuit and the second energy storage circuit discharging to the second battery pack via the first bridge arm, 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. This increases the discharge capacity of the first battery pack in a short time, further improving the discharge efficiency of the first battery pack, thereby further improving the depolarization effect in the first state.

[0029] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0030] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0031] Figure 1 is a functional block diagram of a battery control circuit according to some embodiments of this application;

[0032] Figure 2 is a current waveform diagram of the battery discharge process in some embodiments of this application;

[0033] Figure 3 shows the current waveform during a battery discharge process;

[0034] Figure 4 is a schematic diagram of the structure of a battery control circuit according to some embodiments of this application;

[0035] Figure 5 is a schematic diagram of the current path when the charging device of some embodiments of this application charges the battery.

[0036] Figure 6 is one of the current paths of the battery in the first sub-state according to some embodiments of this application;

[0037] Figure 7 is a second schematic diagram of the current path of the battery in the first sub-state according to some embodiments of this application;

[0038] Figure 8 is one of the current paths of the battery in the second sub-state according to some embodiments of this application;

[0039] Figure 9 is a second schematic diagram of the current path of the battery in the second sub-state according to some embodiments of this application;

[0040] Figure 10 is a second schematic diagram of the battery control circuit of some embodiments of this application;

[0041] Figure 11 is a third schematic diagram of the battery control circuit of some embodiments of this application;

[0042] Figure 12 is a fourth schematic diagram of the battery control circuit of some embodiments of this application;

[0043] Figure 13 is a fifth schematic diagram of the battery control circuit of some embodiments of this application;

[0044] Figure 14 is a flowchart of one of the battery charging control methods according to some embodiments of this application;

[0045] Figure 15 is a flowchart of a battery charging control method according to some embodiments of this application.

[0046] Explanation of reference numerals in the attached drawings: Battery 101, First module 102, Switching circuit 103, First energy storage circuit 104, Controller 105, Charging device 106, Second energy storage circuit 107; First group 11, Second group 12, First bridge arm 20, Second bridge arm 21, Current sensor 23, First connector 24, Second connector 25; 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 V1, First lower bridge arm switch V2, Second upper bridge arm switch V3, Second lower bridge arm switch V4. Detailed Implementation

[0047] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0049] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0050] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0051] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0052] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0053] Batteries undergo polarization during charging and discharging. In some cases, battery polarization occurs because when a large current flows through the electrodes, charge accumulates on the positive and negative electrodes, causing the electrode potentials to deviate from the equilibrium potential. This difference between the actual and equilibrium potentials results in a polarization voltage, and the larger the charging current, the more charge accumulates on the electrodes, leading to a higher polarization voltage. The presence of polarization voltage increases the battery's resistance, reducing the current flowing through the battery and consequently decreasing its charging efficiency.

[0054] The polarization voltage is directly proportional to the actual potential of the battery, that is, directly proportional to the voltage across the battery terminals. During charging, if the battery voltage is too high, severe polarization may have already occurred, thereby reducing the battery's charging efficiency.

[0055] Based on the above considerations, a battery control circuit is designed, including: a first module and a controller. The first module includes a switching circuit and a first energy storage circuit connected to the switching circuit. The controller is configured to: acquire 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 includes: performing mutual discharge between the two battery packs through the first module.

[0056] When the voltage of a battery pack exceeds a first threshold, its polarization voltage is high, making it prone to polarization. Therefore, in response to at least one battery pack's voltage exceeding the first threshold, the first module initiates mutual discharge between the two battery packs, achieving self-discharge of the battery pack with a voltage exceeding the first threshold. During discharge, the charge accumulated on the electrodes causing battery polarization rapidly decreases, reducing the polarization voltage of the battery pack and thus improving polarization. This allows for sustained high-current charging, improving charging efficiency. Simultaneously, the mutual discharge between the two battery packs transfers energy, ensuring that the remaining charge after mutual discharge is consistent or nearly identical to the charge before discharge. This mitigates the problem of depletion caused by excessive discharge from either battery pack, further enhancing charging efficiency.

[0057] The battery control circuit disclosed in this application can be used, but is not limited to, for charging batteries in electrical devices such as vehicles, ships, or aircraft.

[0058] Electrical devices can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0059] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0060] The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery is installed inside the vehicle, which can be located at the bottom, front, or rear of the vehicle. The battery can be used to power the vehicle; for example, it can serve as the vehicle's operating power source.

[0061] In some embodiments of this application, the battery can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0062] As shown in Figure 1, this application embodiment provides a battery control circuit, including: a first module 102 connected to a battery 101; the first module 102 includes a switching circuit 103 and a first energy storage circuit 104 connected to the switching circuit 103; the battery 101 includes two battery packs connected to each other. The battery control circuit further includes: a controller 105 configured to: acquire the voltage of the battery packs 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: performing mutual discharge between the two battery packs via the first module 102.

[0063] The two battery packs can be connected in series or in parallel.

[0064] The first module 102 controls the battery 101 to switch from a charging state to a first state, meaning that in the first state, charging of the battery 101 is stopped. Charging the battery 101 can include charging one of the battery packs or charging both battery packs. By placing the battery in the first state, depolarization of the battery can be achieved.

[0065] The first state may include a first sub-state and a second sub-state. The controller can control battery 101 to be in the first sub-state and the second sub-state in response to at least one of the two battery packs having a voltage greater than a first threshold. 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, thus realizing energy transfer between the two battery packs.

[0066] In some embodiments, the controller 105 can control the battery 101 to alternately and repeatedly be in a first sub-state and a second sub-state, so as to achieve a better depolarization effect on the battery 101.

[0067] The first module 102 connects the positive and negative terminals of each battery pack, thereby forming a circuit with each battery pack to discharge the battery packs via the switching circuit 103 and the first energy storage circuit 104. For example, by controlling the switching circuit 103, any one of the two battery packs can form a circuit with the first energy storage circuit 104, allowing that battery pack to discharge into the first energy storage circuit. The remaining battery pack can also form a separate circuit with the first energy storage circuit, allowing the first energy storage circuit 104 to discharge into the remaining battery pack.

[0068] In some embodiments, the battery 101 may be controlled to switch from a charging state to a first state by the first module 102 only in response to the voltage of one battery pack being greater than a first threshold and the voltage of another battery pack being less than or equal to the first threshold.

[0069] In other embodiments, in response to both battery packs having voltages greater than a first threshold, the first module 102 controls the battery 101 to switch from a charging state to a first state. The first state includes: one battery pack with a voltage greater than the first threshold discharging into the first energy storage circuit 104, and the first energy storage circuit 104 discharging into the other battery pack with a voltage greater than the first threshold. In the charging state, only the battery pack discharging into the first energy storage circuit 104 can be charged, allowing a high current to be used to recharge that battery pack after it has discharged.

[0070] Understandably, during the discharge process from the first battery pack to the second battery pack, the first battery pack can rapidly release accumulated charge, reduce polarization voltage, and improve polarization. Since the two battery packs discharge to each other, in the first state, the second battery pack will also discharge to the first battery pack. If the polarization voltage of the second battery pack is higher, it can also release charge during its discharge, improving polarization. Furthermore, because the two battery packs discharge to each other, their charge levels after discharging are consistent with or nearly consistent with their charge levels before discharging, thus maintaining high charging efficiency after recharging. Since the discharge current of the first and second battery packs is typically small, even if the first and second battery packs are charged, rapid charge accumulation within them will not occur. In fact, due to the small discharge current of the first and second battery packs, charge accumulation may not even occur in the second battery pack. Moreover, when the discharge and charging currents are the same, the rate of charge release during discharge is greater than the rate of charge accumulation during charging. Therefore, the first and second battery packs can rapidly release charge during discharge, while the rate of charge accumulation during discharge is relatively small. Therefore, the discharge process from the first battery pack to the second battery pack does not lead to an increase in the polarization voltage of the second battery pack.

[0071] The first threshold can be a specific voltage value or a range. The first threshold can be adjusted according to the type of battery 101. A method for setting the first threshold is 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, and the charging rate decreases significantly, that voltage value or range can be set as the first threshold. For example, the first threshold can be 80% of the voltage of the battery pack when fully charged.

[0072] The controller 105 may include, but is not limited to, the MCU (Microcontroller Unit) of the vehicle, or the controller in the BMS (Battery Management System) of the battery.

[0073] In some embodiments, the battery 101 also includes a voltage sensor for detecting the voltage of the battery pack. The voltage sensor is communicatively connected to the BMS, and the controller in the BMS can receive the voltage information of the battery pack detected by the voltage sensor, and control the battery 101 to be in a first state in response to the voltage of at least one battery pack being greater than a first threshold.

[0074] In some embodiments, the first energy storage circuit 104 may include, but is not limited to, an inductor.

[0075] In the above technical solution, in response to the voltage of at least one battery pack exceeding a first threshold, the first module performs a mutual discharge operation between the two battery packs, thereby achieving the discharge of the battery pack with a voltage exceeding the first threshold. During the discharge process, the charge accumulated on the electrodes causing polarization of battery 101 decreases rapidly, reducing the polarization voltage of the battery pack and improving the polarization phenomenon of battery 101. This allows for maintaining a high-current charge on battery 101 and improving its charging efficiency. Simultaneously, due to the mutual discharge between the two battery packs, energy is transferred between them, ensuring that the charge level of each battery pack after mutual discharge remains consistent with its charge level before mutual discharge. This reduces the problem of depletion caused by excessive discharge of either battery pack, thus improving the charging efficiency of the battery pack.

[0076] As shown in Figure 10, according to some embodiments of this application, the battery pack whose voltage is greater than a first threshold is denoted as the first battery pack, and the remaining battery pack is denoted as the second battery pack. The controller 105 is further configured to: in a first state, repeatedly perform the operation of discharging the first battery pack to the first energy storage circuit 104 and discharging the first energy storage circuit 104 to the second battery pack N1 times through the switching circuit 103, where N1 is an integer greater than 1; and / or, in the first state, repeatedly perform the operation of discharging the second battery pack to the first energy storage circuit and discharging the first energy storage circuit to the first battery pack N2 times through the switching circuit, where N2 is an integer greater than 1.

[0077] In other words, in the first sub-state, the operation of the first battery pack discharging to the first energy storage circuit 104 and the operation of the first energy storage circuit 104 discharging to the second battery pack are alternately repeated N1 times; and / or, in the second sub-state, the operation of the second battery pack discharging to the first energy storage circuit 104 and the operation of the first energy storage circuit 104 discharging to the first battery pack are alternately repeated N2 times. This allows for energy balance between the first and second battery packs while maintaining the first battery pack in a discharged state for a longer period, and / or maintaining the second battery pack in a discharged state for a longer period.

[0078] In some embodiments, the first battery pack discharging to the first energy storage circuit 104 and the first energy storage circuit 104 discharging to the second battery pack can be repeated N1 times, and the second battery pack discharging to the first energy storage circuit and the first energy storage circuit discharging to the first battery pack can be performed once.

[0079] In other embodiments, the operation of the second battery pack discharging to the first energy storage circuit 104 and the first energy storage circuit 104 discharging to the first battery pack can be repeated N2 times, and the operation of the first battery pack discharging to the first energy storage circuit and the first energy storage circuit discharging to the second battery pack can be repeated once.

[0080] 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 can 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 can be repeated N2 times.

[0081] The values ​​of N1 and N2 can be determined in advance through experiments on battery packs of the same model, so that after alternately repeating the operation of the first battery pack discharging to the first energy storage circuit 104 and the operation of the first energy storage circuit 104 discharging to the second battery pack N1 times; and / or, after alternately repeating the operation of the second battery pack discharging to the first energy storage circuit 104 and the operation of the first energy storage circuit 104 discharging to the first battery pack N2 times, the voltages of both the first battery pack and the second battery pack are less than or equal to the first threshold. The value of N2 can be equal to the value of N1, or it can be different from the value of N1.

[0082] Compared to performing only one 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, and one 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, 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 pack.

[0083] As shown in Figure 2, Figure 2 shows the waveform of the current 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 in the first state, 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.

[0084] As shown in Figure 2, 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 a positive first current I.up When the first energy storage circuit 104 discharges to the second battery pack, the direction of current flow through the first energy storage circuit 104 remains unchanged. However, because 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 The second current I gradually decreases to a positive value. down .

[0085] Repeat the above process, that is, discharge the first battery pack into the first energy storage circuit 104 again, so that the current in the first energy storage circuit 104 rises to I again. up Thus, the current in the first energy storage circuit 104 is at a positive first current I. up and the positive second current I down The states alternate between states until the first sub-state ends, at which point the current in the first energy storage circuit 104 becomes 0.

[0086] After the first sub-state ends, the current in the first energy storage circuit 104 becomes 0, entering the second sub-state, where the second battery pack discharges into the first battery pack. In the second sub-state, the second battery pack charges the first energy storage circuit, causing the current in the first energy storage circuit to gradually increase. Because 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, the current flowing through the first energy storage circuit is reversed compared to the first sub-state, therefore the current is negative. The current in the first energy storage circuit is at a negative first current - I. up and the negative second current -I down The states alternate between states until the second sub-state ends, at which point the current in the first energy storage circuit becomes 0.

[0087] Figure 3 shows the waveform of the current through the first energy storage circuit 104 when, in the first state, the first battery pack discharges to the first energy storage circuit 104 once and the first energy storage circuit 104 discharges to the second battery pack once, and the second battery pack discharges to the first energy storage circuit once and the first energy storage circuit discharges to the first battery pack once.

[0088] As shown in Figure 3, during the discharge of the first battery pack into the first energy storage circuit 104, the current in the first energy storage circuit 104 gradually increases from 0 to a 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 a positive first current I. upThe current gradually decreases because the first battery pack discharges into the first energy storage circuit 104 only once. Therefore, the first energy storage circuit 104 will continuously release energy until the current in the first energy storage circuit 104 decreases to 0. Similarly, during the discharge of the second battery pack into the first battery pack, the current in the first energy storage circuit is at a negative first current -I. up It varies between 0 and 0.

[0089] As can be seen from the above, in the case shown in Figure 2, in the first sub-state, the current through the first energy storage circuit 104 is a positive first current I. up and the positive second current I down The current changes between these states; in the second sub-state, the current through the first energy storage circuit is in the negative first current -I. up and the negative second current -I down The current alternates between these states. In the case shown in Figure 3, the current through the first energy storage circuit 104 is in the positive first current I. up and the negative first current -I up The current changes between the two. That is, the rate of change of the current through the first energy storage circuit 104 in the case shown in Figure 2 is much smaller than the rate of change of the current through the first energy storage circuit 104 in the case shown in Figure 3, thereby reducing the frequency of the current.

[0090] In the above technical solution, the first energy storage circuit 104 can not only control the amount of discharge of the first battery pack each time to prevent it from being too large, but also enable the first battery pack to discharge to the second battery pack multiple times, and / or enable the second battery pack to discharge to the first battery pack multiple times, thereby achieving small-volume and multiple discharges. This reduces the risk of the first and second battery packs being depleted while maintaining the first state for a longer period of time, enhancing the discharge of the first and / or second battery packs, and thus enhancing the depolarization effect on the battery.

[0091] As shown in Figures 4 and 5, according to some embodiments of this application, the positive and negative terminals of battery 101 are also connected to an external charging device 106, and the negative terminals of the two battery packs are connected. The switching circuit 103 includes: a first switch K1, which is connected to the positive terminals of the two battery packs; a first bridge arm 20, whose two ends are respectively connected to the positive and negative terminals of one of the battery packs, and whose midpoint is connected to the first end of the first energy storage circuit 104; a second bridge arm 21, whose two ends are respectively connected to the positive and negative terminals of the other battery pack, and whose second end is connected to the midpoint of the first energy storage circuit 104; the controller 105 is further configured to: control the first switch K1 to close in response to the voltage of both battery packs being less than or equal to a first threshold, so that the charging device 106 charges battery 101; and control the first switch K1 to open in response to the voltage of the battery pack being greater than the first threshold during charging, and put battery 101 in a first state through the first bridge arm 20, the second bridge arm 21, and the first energy storage circuit 104.

[0092] For example, after the negative terminals of the two battery packs are connected, they can be connected to the negative terminal of the charging device 106. The positive terminals 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.

[0093] The charging device 106 may include, but is not limited to, devices capable of charging the battery 101, such as charging piles. The positive and negative terminals of the charging device 106 may be the charging gun of the charging device 106.

[0094] In some embodiments, the charging device 106 may further include a positive charging relay K11 and a negative charging relay K12. The positive charging relay K11 is used to connect to the positive terminal of the battery 101, i.e., to the positive terminals of the two battery packs. The negative charging relay K12 is used to connect to the negative terminal of the battery 101, i.e., to the negative terminals of the two battery packs. When charging is not required, for example, when the battery 101 is in a first state, the controller 105 controls the positive charging relay K11 and the negative charging relay K12 to open. In the charging state, the controller 105 controls the positive charging relay K11 and the negative charging relay K12 to close. Exemplarily, the controller 105 can be a controller 105 on a BMS, the charging device 106 can be a charging pile, and the BMS acquires 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 indicating entry into the first state to the charging pile, causing the charging pile to disconnect the positive charging relay K11 and the negative charging relay K12.

[0095] When the voltages of both battery packs are less than the first threshold, there is no polarization or the polarization is weak, resulting in high charging efficiency for battery 101. Controller 105 controls battery 101 to enter the charging state and closes the first switch K1, positive charging relay K11, and negative charging relay K12. The two battery packs are connected in parallel, and charging device 106 connects to the positive and negative terminals of the parallel battery packs to charge them. For example, controller 105 can be a controller 105 on a BMS, and charging device 106 can be a charging pile. The BMS obtains the battery pack voltages. When the voltages of both battery packs are less than or equal to the first threshold, controller 105 sends a message indicating that the charging state has begun, causing the charging pile to close positive charging relay K11 and negative charging relay K12 to charge battery 101.

[0096] The two battery packs have the same voltage during charging. Therefore, in response to the voltage of either battery pack being greater than a first threshold, the controller 105 controls the first switch K1 to open, thereby controlling the battery 101 to enter the first state.

[0097] In some embodiments, during the entire charging process of the battery, the operation of controlling the first switch K1 to open and put the battery into a first state can be performed only a limited number of times in response to the voltage of the battery pack exceeding a first threshold during charging, so that the battery can be fully charged smoothly. For example, the controller can control the first switch K1 to open only in response to the first detection during battery charging that the voltage of any battery pack exceeds the first threshold, thereby controlling the battery to enter the first state.

[0098] The first bridge arm 20 and the second bridge arm 21 are respectively connected to different battery packs, 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 circuit with different battery packs through the first bridge arm 20 and the second bridge arm 21, thereby enabling the first battery pack to discharge to the first energy storage circuit 104 and the first energy storage circuit 104 to discharge to the second battery pack.

[0099] In the first bridge arm 20 and the second bridge arm 21, 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.

[0100] In some embodiments, the first switch K1 may include, but is not limited to, elements such as relays that can function as switches.

[0101] In the above technical solution, the controller 105 controls the first switch K1 to close, so as to charge the two parallel battery packs. The controller 105 also controls the first switch K1 to open, so that the two battery packs can form charging and discharging circuits respectively through the first bridge arm 20 and the second bridge arm 21, thereby realizing the depolarization of the battery 101. That is, by turning the first switch K1 on and off, the charging state and the first state of the battery 101 can be switched.

[0102] As shown in Figures 6 to 9, according to some embodiments of this application, the 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, which are respectively connected to the positive and negative terminals of the first group 11. The second bridge arm 21 includes: a second upper bridge arm and a second lower bridge arm, which are respectively connected to the positive and negative terminals of the second group 12. The controller 105 is configured to:

[0103] The first operation and the second operation are performed alternately, 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.

[0104] The third and fourth operations are performed alternately 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] To facilitate a clear description of the connection method of the first bridge arm 20, the second bridge arm 21, and the two battery packs, as well as the method of controlling the battery 101 to enter depolarization, the two batteries 101 are respectively named the first group 11 and the second group 12. 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 pack; if the voltage of the second group 12 is greater than the first threshold, the second group 12 serves as the first battery pack. When the voltages of both the first group and the second group are greater than the first threshold, either the first group 11 or the second group 12 can serve as the first battery pack, and the other can serve as the second battery pack.

[0110] The controller may respond to the voltage of the first group 11 and the second group 12 being greater than a first threshold during charging by alternately performing the first operation and the second operation, as well as alternately performing the third operation and the fourth operation. Alternatively, it may alternately control the battery 101 to be in the first sub-state and the second sub-state, in the first sub-state by alternately performing the first operation and the second operation N1 times, and in the second sub-state by alternately performing the third operation and the fourth operation N2 times.

[0111] The first upper bridge arm includes a first upper bridge arm switch V1, and the first lower bridge arm includes a first lower bridge arm switch V2. Turning the first upper bridge arm switch V1 on / off enables the first upper bridge arm to be turned on / off, and turning the first lower bridge arm switch V2 on / off enables the first lower bridge arm to be turned on / off. The types of the first upper bridge arm switch V1 and the first lower bridge arm switch V2 include, but are not limited to, MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) or IGBTs (Insulated-Gate Bipolar Transistors).

[0112] The second upper bridge arm includes a second upper bridge arm switch V3, and the second lower bridge arm includes a second lower bridge arm switch V4. Turning the second upper bridge arm switch V3 on / off enables the second upper bridge arm to be turned on / off, and turning the second lower bridge arm switch V4 on / off enables the second lower bridge arm to be turned on / off. The types of the second upper bridge arm switch V3 and the second lower bridge arm switch V4 include, but are not limited to, MOSFETs or IGBTs.

[0113] The controller 105 is configured to perform a first operation, such 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 terminal 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 terminal of the first group 11, and the first group 11 discharges to the first energy storage circuit 104; and to perform a second operation, such 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 terminal 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.

[0114] In some embodiments, the first energy storage circuit 104 is an inductor. As shown by the solid line with arrows in Figure 6, the current path of the first group 11 discharging into the inductor is shown, and the solid line with arrows in Figure 7 shows the current path of the inductor discharging into the second group 12.

[0115] During the second operation, the first terminal of the first energy storage circuit 104 is connected to the first group 11 via the first upper bridge arm, and the second terminal of the first energy storage circuit 104 is connected to the second group 12 via the second upper bridge arm. This ensures that the voltage of the first group 11 and the first energy storage circuit 104 connected in series is greater than the voltage of the second group 12, allowing the first energy storage circuit 104 to discharge to the second group 12. Furthermore, while the first energy storage circuit 104 is charging the second group 12, the first group 11 can continuously discharge to the first energy storage circuit 104, thereby improving the depolarization effect of the first group 11.

[0116] The controller 105 is configured to perform a third operation, such 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 the current flows out from the positive terminal of the second group 12, through the second upper bridge arm, the first energy storage circuit 104, and the first lower bridge arm, and finally flows back to the negative terminal of the second group 12, and the second group 12 discharges to the first energy storage circuit 104; and to perform a fourth operation, such 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 out from the first energy storage circuit 104, through the first upper bridge arm, the positive and negative terminals of the first battery pack, and the second battery pack, and finally flows back to the first energy storage circuit 104, and the first energy storage circuit 104 discharges to the first group 11.

[0117] In some embodiments, the first energy storage circuit 104 is an inductor. As shown by the solid line with arrows in Figure 8, the current path of the second group 12 discharging into the inductor is shown, and the solid line with arrows in Figure 9 shows the current path of the inductor discharging into the first group 11.

[0118] During the fourth operation, the first terminal of the first energy storage circuit 104 is connected to the first group 11 via the first upper bridge arm, and the second terminal of the first energy storage circuit 104 is connected to the second group 12 via the second upper bridge arm. This ensures that the voltage of the second group 12 and the first energy storage circuit 104 connected in series is greater than the voltage of the first group 11, allowing the first energy storage circuit 104 to discharge to the first group 11. Furthermore, while the first energy storage circuit 104 is charging the first group 11, the second group 12 can continuously discharge to the first energy storage circuit 104, thereby improving the depolarization effect of the second group 12.

[0119] In some embodiments, the first upper bridge arm switch V1 is correspondingly provided with a first freewheeling diode D1, and the first lower bridge arm switch V2 is correspondingly provided with a second freewheeling diode D2. During the interval between switching from the first operation to the second operation and between switching from the second operation to the first operation, current can flow through the first freewheeling diode D1. Similarly, during the interval between switching from the third operation to the fourth operation, current can flow through the second freewheeling diode D2, and during the interval between switching from the fourth operation to the third operation, current can flow through the first freewheeling diode D1. This ensures that current always flows through the inductor during the first state, thereby reducing the rate of change of the current through the inductor and keeping the frequency of the current flowing through the inductor low. When there are multiple inductors, and these inductors are the three-phase windings in the motor, this can greatly improve the problem of high-frequency whistling caused by excessive current flowing through the motor, maintaining relatively stable motor performance and improving the depolarization effect on the battery 101.

[0120] 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 terminal of the first group 11, and the second end of the second switch K2 is connected to the first upper bridge arm, used to control the connection / disconnection between the positive terminal of the first group 11 and the first upper bridge arm. The first end of the third switch K3 is connected to the negative terminal of the first group 11, and the second end of the third switch K3 is connected to the first lower bridge arm, used to control the connection / disconnection between the negative terminal of the first group 11 and the first lower bridge arm. Thus, when the battery 101 needs depolarization, the connection between the first group 11 and the first bridge arm 20 can be controlled by the second switch K2 and the third switch K3; when the battery 101 does not need depolarization, the connection between the first group 11 and the first bridge arm 20 can be disconnected by the second switch K2 and the third switch K3, thereby not affecting the normal performance of the battery 101.

[0121] In some embodiments, the second switch K2 can be connected to the first upper bridge arm via the first connector 24, and the third switch K3 can be connected to the first lower bridge arm via the second connector 25.

[0122] In some embodiments, the battery control circuit further includes a fourth switch K4 connected in parallel with the third switch K3 and a first resistor R, with the third switch K3 and the first resistor R connected in series to provide current limiting protection.

[0123] 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, it can be connected between the positive terminal of the battery 101 and the second switch K2 to detect the current output by the battery 101, so as to regulate the current used for battery depolarization in the battery control circuit to produce a better depolarization effect on the battery 101.

[0124] In some embodiments, the second switch K2, the third switch K3, and the fourth switch K4 may include, but are not limited to, relays.

[0125] In the above technical solution, during the discharge process from the first energy storage circuit 104 to the second group 12, the first energy storage circuit 104, the first battery pack, and the second battery pack can form a loop. The first battery pack can continuously discharge to the first energy storage circuit 104, further improving the depolarization effect on the first battery pack. Furthermore, it can also make the voltage of the first battery pack and the first energy storage circuit 104 connected in series greater than the voltage of the second battery pack, increasing the success rate of the first energy storage circuit 104 successfully discharging to the second battery pack. Similarly, during the discharge process from the first energy storage circuit 104 to the first battery pack, the first energy storage circuit 104, the first battery pack, and the second battery pack can form a loop. The second battery pack can continuously discharge to the first energy storage circuit 104, improving both the success rate of the first energy storage circuit 104 successfully discharging to the first battery pack and the depolarization effect on the second battery pack.

[0126] As shown in Figure 10, according to some embodiments of this application, the first module 102 further includes a second energy storage circuit 107, which is connected in parallel to both ends of the first bridge arm 20. The controller 105 is also configured to: in a first state, through the switching circuit 103, discharge any one of the two battery packs whose voltage is greater than a first threshold to the second energy storage circuit 107 and discharge the second energy storage circuit 107 to the remaining battery pack.

[0127] That is, the two ends of the second energy storage circuit 107 are respectively connected to the positive and negative terminals 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, thereby enabling the operation of discharging any one of the two battery packs 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 battery pack.

[0128] Since the two battery packs are connected in parallel during charging, their voltages are identical during charging. For example, the two battery packs include a first group 11 and a second group 12. In a first state, it is possible to perform discharge from the first group 11 to the second energy storage circuit 107 and from the second energy storage circuit 107 to the second group 12, and / or to perform discharge from the second group 12 to the second energy storage circuit 107 and from the second energy storage circuit 107 to the first group 11.

[0129] In some embodiments, the second energy storage circuit 107 may include, but is not limited to, components with charging and discharging functions such as inductors or capacitors.

[0130] In the above technical solution, the second energy storage circuit 107 can also enable a 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.

[0131] As shown in Figure 10, according to some embodiments of this application, the two battery packs include: a first group 11 and a second group 12. The first group 11 is connected to the first bridge arm 20. The controller 105 is further configured to: in a first state, 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 through the switching circuit 103, 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, 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 through the switching circuit 103, 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.

[0132] 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.

[0133] For example, during the execution of the first operation, such 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 is able to form a loop with the first group 11, such that the first group 11 discharges to the first energy storage circuit 104 and the second energy storage circuit 107 simultaneously, that is, the second energy storage circuit 107 stores energy.

[0134] During the second operation, in which 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.

[0135] That is, during the execution of the first operation and the second operation, the first group 11 can simultaneously discharge to the second group 12 through the first energy storage circuit 104 and the second energy storage circuit 107.

[0136] 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 separately so that the first group 11 discharges to the second energy storage circuit 107, and the second energy storage circuit 107 stores energy.

[0137] During 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.

[0138] That is, during the execution of the third and fourth operations, 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.

[0139] In the above technical solution, the second energy storage circuit 107 can increase the discharge amount of the first group 11 in a short time, thereby improving the discharge efficiency of the first group 11 and further improving the depolarization effect in the first state.

[0140] As shown in Figure 11, according to some embodiments of this application, the first energy storage circuit 104 includes at least one inductor, and the second energy storage circuit 107 includes a capacitor C.

[0141] In some embodiments, the first energy storage circuit 104 may include an inductor.

[0142] In other embodiments, the first energy storage circuit 104 may also include multiple inductors, which may be connected in parallel, in series, or a portion of the 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 inductors connected in parallel, with each inductor in parallel corresponding to one of the multiple first bridge arms 20.

[0143] For example, the first energy storage circuit 104 may include three first inductors L1 and one second inductor L2, with the three first inductors L1 connected in parallel and then connected in series with the second inductor L2. There are three first bridge arms 20, with each of the three first inductors L1 connected to one of the three first bridge arms 20. The first end of each first inductor L1 is connected to the midpoint of a first bridge arm 20, the first end of each second inductor L2 is connected to the second end of each first inductor L1, and the second end of each second inductor L2 is connected to the midpoint of a second bridge arm 21. The three first inductors L1 can be three-phase windings in a motor, and the bridge arms connected to the first inductors L1 can be three-phase bridge arms. In this way, when charging the vehicle with battery 101, the existing motor and three-phase bridge arms in the vehicle can be used to depolarize battery 101, reducing costs.

[0144] Both capacitor C and inductor have charging and discharging functions. The first energy storage circuit 104 includes at least one inductor, and the second energy storage circuit 107 includes capacitor C. It is possible to simultaneously execute the first group 11 discharging to the inductor and the first group 11 discharging to capacitor C through the switching circuit 103, and simultaneously execute the inductor discharging to the second group 12 and the capacitor C discharging to the second group 12; and / or, through the switching circuit 103, simultaneously execute the second group 12 discharging to the inductor and the first group 11 discharging to capacitor C, and simultaneously execute the inductor discharging to the first group 11 and the capacitor C discharging to the first group 11.

[0145] As shown in Figure 11, capacitor C is connected in parallel across 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 circuit, capacitor C can form a circuit 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 capacitor C and inductor simultaneously, that is, capacitor C and inductor store energy.

[0146] 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 circuit, the capacitor C can form a circuit with the second group 12, the first upper bridge arm, the inductor and the second upper bridge arm, and the inductor and capacitor C release energy to the second group 12.

[0147] The second group 12, the second upper bridge arm, the inductor, and the first lower bridge arm form a circuit so that when the second group 12 discharges to the inductor, the capacitor C can form a circuit with the first group 11 alone, so that the first group 11 discharges to the capacitor C, and the capacitor C stores energy.

[0148] The first group 11, the first upper bridge arm, the inductor, the second upper bridge arm and the second group 12 form a circuit so that the inductor discharges to the first group 11, and the capacitor C acts as a substitute for the power source, releasing energy to the first group 11.

[0149] In the above technical solution, the capacitor has a small volume and can achieve fast charging and discharging. While further improving the depolarization effect of battery 101, it keeps the battery control circuit small, reduces the weight of the battery control circuit, and lowers the cost.

[0150] As shown in Figure 12, according to some embodiments of this application, the positive and negative terminals of battery 101 are also 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, the first end of the first bridge arm 20 being connected to the positive terminal of battery 101, and the second end being connected to the negative terminal of battery 101. 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 further configured to: control the charging device 106 to charge battery 101 in response to the voltage of both battery packs being less than or equal to a first threshold; and put battery 101 into a first state through the first bridge arm 20 and the first energy storage circuit 104 in response to the voltage of at least one of the two battery packs being greater than the first threshold.

[0151] When two battery packs are connected in series, the voltages of the two battery packs can be the same or different.

[0152] 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 the node between the first upper bridge arm and the first lower bridge arm.

[0153] Of the two battery packs, the one with a voltage greater than the first threshold is designated as the first battery pack, and the other battery pack is designated as the second battery pack.

[0154] In some embodiments, the first state includes a first sub-state and a second sub-state. The controller 105 is configured to: in the first sub-state, alternately and repeatedly perform at least one instance of the first battery pack discharging to the first energy storage circuit 104 and the first energy storage circuit 104 discharging to the second battery pack; and in the second sub-state, alternately and repeatedly perform at least one instance of the second battery pack discharging to the first energy storage circuit 104 and the first energy storage circuit 104 discharging to the first battery pack. That is, the first battery pack and the second battery pack exchange energy. Thus, regardless of whether the voltage of the second battery pack is greater than a first threshold, after the first state ends, the first battery pack and the second battery pack can maintain energy balance. This prevents the voltage of the second battery pack from increasing, thus avoiding the problem of severe polarization of the second battery pack. Furthermore, if the voltage of the second battery pack is greater than the first threshold, depolarization of the second battery pack can also be performed.

[0155] During the entire charging process of the battery, the operation of putting the battery 101 into a first state via the first bridge arm 20 and the first energy storage circuit 104 can be performed only a limited number of times in response to at least one battery pack having a voltage greater than a first threshold during charging, so that the battery can be successfully fully charged. For example, the controller can put the battery 101 into 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.

[0156] 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 used to connect to the positive terminal of the battery 101, and the negative charging relay K12 is used to connect to the negative terminal of the battery 101. The method for controlling the positive charging relay K11 and the negative charging relay K12 to be turned on or off can be referred to the relevant description above, and will not be repeated below.

[0157] The principle of the battery control circuit is described below with the negative terminal of the first battery pack and the positive terminal of the second battery pack connected, the first upper bridge arm connected to the positive terminal of the first battery pack, and the first lower bridge arm connected to the negative terminal of the second battery pack, and the first state including the first sub-state and the second sub-state.

[0158] The controller 105 is configured to sequentially and alternately perform a fifth operation and a sixth operation to put the battery 101 in a first sub-state, and sequentially and alternately perform a sixth operation and a fifth operation to put the battery 101 in a second sub-state.

[0159] 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.

[0160] In the first sub-state, the fifth operation and the sixth operation are executed 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. The current flows from the positive terminal of the first group 11 through the upper bridge arm and the first energy storage circuit 104 and then flows back to the negative terminal of the first group 11. The first group 11 stores energy.

[0161] When the sixth operation is performed, the first lower bridge arm is turned on and 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. The current flows from the first energy storage circuit 104 through the positive terminal of the second group 12, the negative terminal of the second group 12 and the first lower bridge arm and then back to the first energy storage circuit 104. That is, the first energy storage circuit 104 releases energy to the second group 12.

[0162] In the second sub-state, the sixth and fifth operations are executed alternately in sequence. Executing the sixth operation, 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 storage circuit 104 form a loop. Current flows from the positive terminal of the second group 12 through the first lower bridge arm and the first energy storage circuit 104, and then back to the negative terminal of the second group 12. The first energy storage circuit 104 stores energy. Executing the fifth operation, the first upper bridge arm is turned on, the first lower bridge arm is turned off, and the first energy storage circuit 104, the first upper bridge arm, and the first group 11 form a loop. Current flows from the first energy storage circuit 104 through the positive terminal of the first group 11, the negative terminal of the first group 11, and the first upper bridge arm, and then back to the first energy storage circuit 104. In other words, the inductor releases energy to the first group 11.

[0163] In some embodiments, the first energy storage circuit 104 is an inductor.

[0164] In some embodiments, the number of first bridge arms 20 can be multiple, and the multiple first bridge arms 20 are connected in parallel. The first energy storage circuit 104 includes multiple first inductors L1 connected in parallel, and the multiple first inductors L1 are connected one-to-one with the multiple first bridge arms 20. In some embodiments, the first energy storage circuit 104 may further include a second inductor L2, which is connected in series with the multiple first inductors L1 connected in parallel. The second end of the second inductor L2 is connected to the midpoint of the first bridge arm 20.

[0165] In the above technical solution, the first bridge arm 20 enables the two battery packs to form charging and discharging circuits with the first energy storage circuit 104, thereby achieving depolarization of the series-connected battery 101.

[0166] According to some embodiments of this application, the first module 102 further includes a second energy storage circuit, which is connected in parallel across the two ends of the battery 101. The controller 105 is also configured to: in a first state, through the first bridge arm 20, discharge either of the two battery packs whose voltage is greater than a first threshold to the second energy storage circuit and discharge the second energy storage circuit to the remaining battery pack.

[0167] The second energy storage circuit is connected in parallel across the two ends of battery 101, and the first bridge arm 20 is also connected in parallel across the two ends of battery 101. That is, the second energy storage circuit is connected in parallel with 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 the discharge of any one of the battery packs with a voltage greater than a first threshold to the second energy storage circuit and the discharge of the second energy storage circuit 107 to the remaining battery pack.

[0168] For example, the battery pack whose voltage is greater than a first threshold is designated as the first battery pack, and the remaining battery pack is designated as the second battery pack. The controller 105 is configured to, in a first state, alternately perform at least one discharge from the first battery pack to the second energy storage circuit and a second discharge from the 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, also alternately perform at least one discharge from the second battery pack to the second energy storage circuit and a second discharge from the energy storage circuit to the first battery pack via the first bridge arm 20.

[0169] In some embodiments, the controller 105 is configured to simultaneously perform discharge from the first battery pack to the first energy storage circuit 104 and discharge from the first battery pack to the second energy storage circuit via the first bridge arm 20, and / or simultaneously perform discharge from the first energy storage circuit 104 to the second battery pack and discharge from the second energy storage circuit to the second battery pack. The controller 105 may also be configured to, in a first state, simultaneously perform discharge from the second battery pack to the first energy storage circuit 104 and discharge from the second battery pack to the second energy storage circuit via the first bridge arm 20, and / or simultaneously perform discharge from the first energy storage circuit 104 to the first battery pack and discharge from the second energy storage circuit to the first battery pack.

[0170] In other embodiments, the controller 105 may also be configured to simultaneously perform discharge from the first battery pack to the first energy storage circuit 104 and discharge from the second energy storage circuit to the second battery pack, and / or simultaneously perform discharge from the first energy storage circuit 104 to the second battery pack and discharge from the first battery pack to the second energy storage circuit, via the first bridge arm 20. The controller 105 may also be configured to, in a first state, simultaneously perform discharge from the second battery pack to the first energy storage circuit 104 and discharge from the second energy storage circuit to the first battery pack, and / or simultaneously perform discharge from the first energy storage circuit 104 to the first battery pack and discharge from the second battery pack to the second energy storage circuit, via the first bridge arm 20.

[0171] In some other embodiments, the controller 105 may also be configured to control the operation of either battery pack having a voltage greater than a first threshold discharging into the second energy storage circuit and the second energy storage circuit discharging into the remaining battery pack, and to prevent the operation of either battery pack having a voltage greater than the first threshold discharging into the first energy storage circuit 104 and the operation of the first energy storage circuit 104 discharging into the remaining battery pack from being performed simultaneously.

[0172] In some embodiments, the second energy storage circuit may include, but is not limited to, components with charging and discharging functions such as inductors or capacitors.

[0173] In the above technical solution, the second energy storage circuit can also enable a 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.

[0174] As shown in Figure 13, according to some embodiments of this application, the battery pack whose voltage is greater than a first threshold is referred to as the first battery pack, and the remaining battery pack is referred to as the second battery pack.

[0175] The controller 105 is also configured to: in a first state, simultaneously discharge the first battery pack to the first energy storage circuit 104 and the second energy storage circuit 107 to the second battery pack via the first bridge arm 20, and simultaneously discharge the first energy storage circuit 104 to the second battery pack and the first battery pack to the second energy storage circuit.

[0176] Understandably, in some embodiments, the controller 105 is configured to, in a first state, simultaneously perform discharge from the second battery pack to the first energy storage circuit 104 and discharge from the second energy storage circuit to the first battery pack via the first bridge arm 20, and simultaneously perform discharge from the first energy storage circuit 104 to the first battery pack and discharge from the second battery pack to the second energy storage circuit. This allows for the maintenance of a charge balance between the first and second battery packs while depolarizing the first battery pack.

[0177] In some embodiments, the second energy storage circuit may include a capacitor C, and the first energy storage circuit 104 may include at least one inductor.

[0178] As shown in Figure 13, capacitor C is connected in parallel across the two ends of battery 101. During the discharge of the first battery pack into the inductor through the first bridge arm 20, capacitor C can act as a substitute power source. Furthermore, since the first bridge arm 20 is connected to the inductor, capacitor C can form a circuit with the second battery pack through the first bridge arm 20 and the inductor, thereby enabling capacitor C to discharge into the second battery pack.

[0179] When the second battery pack forms a circuit with the first bridge arm 20 and the inductor, so that during the discharge of the inductor to the second battery pack, the capacitor C can form a circuit with the first battery pack through the first bridge arm 20 and the inductor, thereby allowing the first battery pack to discharge to the capacitor C.

[0180] Similarly, during the discharge of the second battery pack into the inductor via the first bridge arm 20, the capacitor C can also form a circuit with the first battery pack via the first bridge arm 20 and the inductor, thereby discharging the capacitor C into the first battery pack.

[0181] While the first battery pack forms a circuit through the first bridge arm 20 and the inductor, so that the inductor discharges to the first battery pack, the capacitor C can form a circuit with the second battery pack through the first bridge arm 20 and the inductor, so that the second battery pack discharges to the capacitor C.

[0182] In the above technical solution, the first battery pack can simultaneously discharge the second battery pack through the first energy storage circuit 104 and the second energy storage circuit 107, which can increase the discharge amount of the first battery pack in a short time, further improve the discharge efficiency of the first battery pack, and thus further improve the depolarization effect in the first state.

[0183] This application provides a battery system that includes the battery control circuit described in the above embodiments.

[0184] The battery system includes a battery 101, which is connected to a battery control circuit. The battery system has the beneficial effects of the battery control circuit provided in the embodiments of this application; for details, please refer to the specific descriptions of the battery control circuit in the above embodiments, which will not be repeated here.

[0185] This application provides an electrical device that includes the battery system described in the above embodiments, the battery system being used to provide electrical energy.

[0186] The electrical devices can be referred to the relevant descriptions in the above embodiments, and will not be repeated below.

[0187] As shown in Figure 14, this application embodiment provides a battery charging control method. The battery 101 includes two battery packs connected to each other. The battery 101 is connected to a first module 102. The first module 102 includes a switching circuit 103 and a first energy storage circuit 104 connected to the switching circuit 103. The method includes:

[0188] Step 110: Obtain the voltage of the battery pack during charging;

[0189] Step 120: In response to the voltage of at least one battery pack being greater than a first threshold, the first module 102 controls the battery 101 to switch from a charging state to a first state, the first state including: the first module 102 performing mutual discharge between the two battery packs.

[0190] The structure of the battery 101 and the first module 102 can be referred to the relevant description in the above embodiments, and will not be repeated below.

[0191] In step 110, the method for obtaining the voltage of the battery pack during charging can be referred to the relevant description in the above embodiments, and will not be repeated below.

[0192] Step 120 can be executed by the controller 105 in the above embodiments. The method for setting the first threshold and the method related to step 120 can be referred to the relevant description in the above embodiments, and will not be repeated below.

[0193] The battery pack whose voltage is greater than the first threshold is denoted as the first battery pack, and the remaining battery pack is denoted as the second battery pack. In step 120, the first state may include a first sub-state and a second sub-state. The first sub-state may include: discharging the first battery pack to the first energy storage circuit 104 and discharging the first energy storage circuit 104 to the second battery pack.

[0194] The second sub-state includes: discharging the second battery pack to the first energy storage circuit 104 and discharging the first energy storage circuit 104 to the first battery pack.

[0195] In some embodiments, the battery 101 can be controlled to alternately and repeatedly be in a first sub-state and a second sub-state. The number of alternations can be set in advance according to the type of battery 101 and a first threshold. For example, the number of times the battery 101 alternates between the first sub-state and the second sub-state can be 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.

[0196] The above technical solution enables the battery pack to discharge when the voltage is greater than the first threshold, reduces the polarization voltage of the battery pack, improves the polarization phenomenon of the battery pack, thereby maintaining a large current charge on the battery 101 and improving the charging efficiency of the battery 101.

[0197] As shown in Figure 10, according to some embodiments of this application, the battery pack whose voltage is greater than a first threshold is denoted as the first battery pack, and the remaining battery pack is denoted as the second battery pack. The first state further includes: repeatedly performing the operation of the first battery pack discharging to the first energy storage circuit 104 and the first energy storage circuit 104 discharging to the second battery pack N1 times, where N1 is an integer greater than 1; and / or, repeatedly performing the operation of the second battery pack discharging to the first energy storage circuit and the first energy storage circuit discharging to the first battery pack N2 times, where N2 is an integer greater than 1.

[0198] The definitions of the first battery pack and the second battery pack can be found in the relevant descriptions of the above embodiments, and will not be repeated below.

[0199] The methods for repeatedly performing the operation of the first battery pack discharging to the first energy storage circuit 104 and the first energy storage circuit 104 discharging to the second battery pack N1 times, and / or repeatedly performing the operation of the second battery pack discharging to the first energy storage circuit and the first energy storage circuit discharging to the first battery pack N2 times, as well as the setting method of the values ​​of N1 and N2, can be referred to the relevant descriptions in the above embodiments, and will not be repeated below.

[0200] As shown in Figures 4 and 15, according to some embodiments of this application, the positive and negative terminals of battery 101 are also connected to an external charging device 106, the negative terminals of the two battery packs are connected, and the switching circuit 103 includes: a first switch K1, which is connected to the positive terminals of the two battery packs; a first bridge arm 20, the two ends of which are connected to the positive and negative terminals of one of the battery packs, and the midpoint of the first bridge arm 20 is connected to the first terminal of the first energy storage circuit 104; and a second bridge arm 21, the first terminal of which is connected to the second terminal of the first energy storage circuit 104, and the second terminal of which is connected to the positive terminal of the other battery pack.

[0201] Step 120 includes: in response to the battery pack voltage being greater than a first threshold during charging, controlling the first switch K1 to open, and putting 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.

[0202] The method further includes step 130, in response to the voltage of both battery packs being less than or equal to a first threshold, controlling the first switch K1 to close so that the charging device 106 charges the battery 101.

[0203] The structure and connection method of the charging device 106, the first switch K1, the first bridge arm 20 and the second bridge arm 21 can be referred to the relevant descriptions in the above embodiments, and will not be repeated below.

[0204] For the specific methods of steps 120 and 130, please refer to the relevant descriptions in the above-mentioned embodiments, which will not be repeated below.

[0205] In the above technical solution, when the voltage of either the first battery pack or the second battery pack is detected to be greater than the first threshold, the first switch K1 is disconnected, allowing the first battery pack and the second battery pack to form charging and discharging circuits respectively through the first bridge arm 20 and the second bridge arm 21, thereby achieving depolarization of the battery 101. Thus, by switching the first switch K1 on and off, the charging state and the first state of the battery 101 can be switched.

[0206] As shown in Figure 10, according to some embodiments of this application, the 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, which are respectively connected to the positive and negative terminals of the first group 11. The second bridge arm 21 includes: a second upper bridge arm and a second lower bridge arm, which are respectively connected to the positive and negative terminals of the second group 12.

[0207] Step 120 includes: alternately performing a first operation and a second operation to cause the first group 11 to discharge to the first energy storage circuit 104 and the first energy storage circuit 104 to discharge to the second group 12; and alternately performing a third operation and a fourth operation to cause the second group 12 to discharge to the first energy storage circuit 104 and the first energy storage circuit 104 to discharge to the first group 11.

[0208] 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.

[0209] 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.

[0210] 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.

[0211] 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.

[0212] The definitions of the first group 11 and the second group 12 can be found in the relevant descriptions in the above embodiments, and will not be repeated below.

[0213] The structure of the first upper bridge arm, the first lower bridge arm, the second upper bridge arm, and the second lower bridge arm, as well as their connection with the battery pack, can be found in the descriptions in the above embodiments, and will not be repeated hereafter.

[0214] The specific methods and principles for performing the first, second, third, and fourth operations to bring the battery 101 to the first state can be referred to the relevant descriptions in the above embodiments, and will not be repeated below.

[0215] In some embodiments, the first energy storage circuit 104 includes an inductor that satisfies a volt-second product balance when the battery 101 is controlled to alternate between a first sub-state and a second sub-state. In other words, in successive first and second sub-states, the volt-second product of the inductor in the first sub-state is equal to the volt-second product in the second sub-state.

[0216] The volt-second product refers to the voltage applied across the inductor multiplied by the conduction time. The volt-second product of the inductor in the first sub-state is the voltage applied across the inductor during the first heating phase multiplied by the duration of the first sub-state, and the volt-second product of the inductor in the second sub-state is the voltage applied across the inductor during the second sub-state multiplied by the duration of the second sub-state.

[0217] When the volt-second product is balanced, the energy transferred through the inductor in the first sub-state is the same as the energy transferred through the inductor in the second sub-state, thereby maintaining the energy balance between the two battery packs.

[0218] Furthermore, under the condition of satisfying the volt-second product balance, the duration of the first sub-state can be different from that of the second sub-state, and the current through the inductor in the first sub-state can also be different from that in the second sub-state, thereby simplifying the control method for depolarizing the battery 101.

[0219] In the above technical solution, during the discharge process from the first energy storage circuit 104 to the second battery pack 12, the first energy storage circuit 104, the first battery pack, and the second battery pack can form a circuit, and the first battery pack can continuously discharge to the first energy storage circuit 104, further improving the depolarization effect on the first battery pack. Similarly, during the discharge process from the first energy storage circuit 104 to the first battery pack, the first energy storage circuit 104, the first battery pack, and the second battery pack can form a circuit, and the second battery pack can continuously discharge to the first energy storage circuit 104, improving the depolarization effect on the second battery pack.

[0220] As shown in Figure 10, according to some embodiments of this application, the first module 102 further includes a second energy storage circuit 107, which is connected in parallel to both ends of the first bridge arm 20. The first state further includes: through the switching circuit 103, discharging the battery pack with a voltage greater than a first threshold to the second energy storage circuit 107 and discharging the second energy storage circuit 107 to the remaining battery pack.

[0221] The structure of the second energy storage circuit 107 and the method of discharging the battery pack with a voltage greater than the first threshold to the second energy storage circuit 107 and the second energy storage circuit 107 discharging to the remaining battery pack via the switching circuit 103 can be referred to the relevant description in the above embodiments, and will not be repeated below.

[0222] In the above technical solution, the second energy storage circuit 107 can also enable a 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.

[0223] As shown in Figure 10, according to some embodiments of this application, the two battery packs include: a first group 11 and a second group 12. The first group 11 is connected to the first bridge arm 20. The first state further includes: simultaneously executing 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 through the switching circuit 103, and simultaneously executing 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, simultaneously executing 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 through the switching circuit 103, and simultaneously executing 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.

[0224] For example, 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 be referred to the relevant description in the above embodiments, and will not be repeated below.

[0225] The above technical solution can increase the discharge amount of the first group 11 in a short time and improve the discharge efficiency of the first group 11, thereby further improving the depolarization effect in the first state.

[0226] As shown in Figure 12, according to some embodiments of this application, the positive and negative terminals of battery 101 are also 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, the first end of which is connected to the positive terminal of battery 101, and the second end of which is connected to the negative terminal of battery 101. The midpoint of the first bridge arm 20 is connected to the first terminal of the first energy storage circuit 104, and the second terminal of the first energy storage circuit 104 is connected between the two battery packs.

[0227] The method also includes: in response to the voltage of both battery packs being less than or equal to a first threshold, controlling the charging device 106 to charge the battery 101.

[0228] Step 120 includes: in response to the voltage of at least one of the two battery packs being greater than a first threshold, putting battery 101 into a first state via the first bridge arm 20 and the first energy storage circuit 104.

[0229] 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 for controlling the charging device 106 to charge the battery 101 and for putting the battery 101 in a first state through the first bridge arm 20 and the first energy storage circuit 104, can be referred to the relevant description in the above embodiments, and will not be repeated below.

[0230] In the above technical solution, the first bridge arm 20 enables the first battery pack and the second battery pack to each form a charging and discharging circuit with the first energy storage circuit 104, thereby achieving depolarization of the series-connected batteries 101.

[0231] As shown in Figure 13, according to some embodiments of this 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. The second energy storage circuit is connected in parallel across the two ends of the battery 101. The first state also includes: through the first bridge arm 20, performing discharge from any one of the two battery packs with a voltage greater than a first threshold to the second energy storage circuit and the second energy storage circuit to the remaining battery pack.

[0232] The structure of the second energy storage circuit 107 and the above method can be found in the descriptions in the above embodiments, and will not be repeated hereafter.

[0233] In the above technical solution, the second energy storage circuit can also enable a 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.

[0234] As shown in Figure 10, according to some embodiments of this application, the battery pack whose voltage is greater than a first threshold is referred to as the first battery pack, and the remaining battery pack is referred to as the second battery pack.

[0235] When two battery packs are connected in series and the switching circuit 103 includes a first bridge arm 20, the first state further includes: simultaneously discharging the first battery pack to the first energy storage circuit 104 and discharging the second energy storage circuit 107 to the second battery pack through the first bridge arm 20, and simultaneously discharging the first energy storage circuit 104 to the second battery pack and the first battery pack to the second energy storage circuit.

[0236] For example, 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 be referred to the relevant description in the above embodiments, and will not be repeated below.

[0237] The above technical solution can increase the discharge capacity of the first battery pack in a short time, further improve the discharge efficiency of the first battery pack, and thus further improve the depolarization effect in the first state.

[0238] This application provides a battery control circuit. The positive and negative terminals of a battery 101 are connected to an external charging device 106, respectively. The negative terminals of two battery packs are connected. The battery control circuit includes: a first switch K1 connected to the positive terminals of the two battery packs; a first bridge arm 20, with its two ends connected to the positive and negative terminals of one battery pack, respectively; a second bridge arm 21, with its two ends connected to the positive and negative terminals of the other battery pack, respectively; a first energy storage circuit 104, with its two ends connected to the midpoint of the first bridge arm 20 and the midpoint of the second bridge arm 21, respectively; and a controller 105 configured to: close the first switch K1 in response to the voltage of both battery packs being less than or equal to a first threshold, so that the charging device 106 charges the battery 101; and open the first switch K1 in response to the voltage of the battery packs being greater than the first threshold during charging, and put the battery 101 in a first state through the first bridge arm 20, the second bridge arm 21, and the first energy storage circuit 104.

[0239] The first state includes a first sub-state and a second sub-state. 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 operation of the first battery pack discharging to the first energy storage circuit 104 and the first energy storage circuit 104 discharging to the second battery pack is repeatedly performed N1 times through the first bridge arm 20 and the second bridge arm 21, where N1 is an integer greater than 1. In the second sub-state, the operation of the second battery pack discharging to the first energy storage circuit 104 and the first energy storage circuit 104 discharging to the first battery pack is repeatedly performed N2 times through the first bridge arm 20 and the second bridge arm 21, where N2 is an integer greater than 1.

[0240] The first bridge arm 20 includes a first upper bridge arm and a first lower bridge arm, which are respectively connected to the positive and negative terminals of the first group 11. The second bridge arm 21 includes a second upper bridge arm and a second lower bridge arm, which are respectively connected to the positive and negative terminals of the second group 12. The controller 105 is configured to alternately execute a first operation and a second operation to put the battery 101 in a first sub-state, and alternately execute a third operation and a fourth operation to put the battery 101 in a second sub-state. The first operation includes controlling the first upper bridge arm and the second lower bridge arm to be on, and the first lower bridge arm and the second upper bridge arm to be off. The second operation includes controlling the first upper bridge arm and the second upper bridge arm to be on, and the first lower bridge arm and the second lower bridge arm to be off. The third operation includes controlling the first lower bridge arm and the second upper bridge arm to be on, and the first upper bridge arm and the second lower bridge arm to be off. The fourth operation includes controlling the first upper bridge arm and the second upper bridge arm to be on, and the first lower bridge arm and the second lower bridge arm to be off.

[0241] The first module 102 also includes a capacitor C, which is connected in parallel across the two ends of the first bridge arm 20.

[0242] The first energy storage circuit 104 includes at least one inductor. In the first state, the inductor satisfies the volt-second product balance.

[0243] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery control circuit, comprising: A first module is connected to the battery. The first module includes a switching circuit and a first energy storage circuit connected to the switching circuit. The battery includes two battery packs connected to each other. The controller is configured as follows: The voltage of the battery pack during charging is acquired, and in response to the voltage of at least one battery pack being greater than a first threshold, the first module controls the battery to switch from a charging state to a first state. The first state includes: The first module performs mutual discharge between the two battery packs.

2. The battery control circuit according to claim 1, wherein, The battery pack whose voltage is greater than the first threshold is designated as the first battery pack, and the remaining battery pack is designated as the second battery pack. The controller is further configured to: In the first state, the switching circuit repeatedly performs 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 N1 times, where N1 is an integer greater than 1; and / or, In the first state, the operation of the second battery pack discharging to the first energy storage circuit and the first energy storage circuit discharging to the first battery pack is repeatedly performed N2 times through the switching circuit, where N2 is an integer greater than 1.

3. The battery control circuit according to claim 1 or 2, wherein, The positive and negative terminals of the battery are also connected to an external charging device, and the negative terminals of the two battery packs are connected. The switching circuit includes: A first switch is connected to the positive terminals of the two battery packs; The first bridge arm has its two ends connected to the positive and negative terminals of one of the battery packs, respectively, and the midpoint of the first bridge arm is connected to the first terminal of the first energy storage circuit. The second bridge arm has its two ends connected to the positive and negative terminals of the other battery pack, respectively, and the second end of the first energy storage circuit is connected to the midpoint of the second bridge arm. The controller is also configured to: In response to the voltage of both battery packs being less than or equal to the first threshold, the first switch is controlled to close so that the charging device charges the battery; In response to the battery pack voltage being greater than the first threshold during charging, the first switch is controlled to open, and the battery is brought to 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, wherein, 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 and negative electrodes 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 and negative terminals of the second group. The controller is configured to: The first operation and the second operation are performed alternately, so that the first group discharges to the first energy storage circuit and the first energy storage circuit discharges to the second group; The third and fourth operations are performed alternately, such 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, wherein, The first module further includes a second energy storage circuit, which is connected in parallel to both ends of the first bridge arm. The controller is further configured to: In the first state, the switching circuit performs the following actions: the battery pack 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 battery pack.

6. The battery control circuit according to claim 5, wherein, 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 is further configured to: In the first state, the switching circuit simultaneously performs the following operations: the first group discharges to the first energy storage circuit and the first group discharges to the second energy storage circuit; and simultaneously performs the first energy storage circuit discharges to the second group and the second energy storage circuit discharges to the second group; and / or In the first state, the switching circuit simultaneously performs the second group discharging to the first energy storage circuit and the first group discharging to the second energy storage circuit, as well as simultaneously performs the first energy storage circuit discharging to the first group and the second energy storage circuit discharging to the first group.

7. The battery control circuit according to claim 5 or 6, wherein, 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, wherein, The positive and negative terminals of the battery are also connected to an external charging device, and the two battery packs are connected in series. The switching circuit includes: The first bridge arm has a first end connected to the positive terminal of the battery and a second end connected to the negative terminal of the battery. The midpoint of the first bridge arm is connected to a first terminal of the first energy storage circuit, and the second terminal of the first energy storage circuit is connected between the two battery packs. The controller is also configured to: In response to the voltage of both battery packs being less than or equal to the first threshold, the charging device is controlled 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 brought into the first state via the first bridge arm and the first energy storage circuit.

9. The battery control circuit according to claim 8, wherein, The first module further includes a second energy storage circuit, which is connected in parallel across the two ends of the battery, and the controller is further configured to: In the first state, through the first bridge arm, the battery pack 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 battery pack.

10. The battery control circuit according to claim 9, wherein, The battery pack whose voltage is greater than the first threshold is designated as the first battery pack, and the remaining battery pack is designated as the 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 simultaneously, as well as the first energy storage circuit discharges to the second battery pack and the first battery pack discharges to the second energy storage circuit simultaneously.

11. A battery system, wherein, Includes the battery control circuit described in any one of claims 1-10.

12. An electrical appliance, wherein, Includes the battery system of claim 11, wherein the battery system supplies power to the electrical device.

13. A battery charging control method, wherein, The battery includes two battery packs connected to each other. The battery is 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 includes: Obtain the voltage of the battery pack during charging; In response to a voltage greater than a first threshold value in at least one of the battery packs, the first module controls the battery to switch from a charging state to a first state, the first state including: The first module performs mutual discharge between the two battery packs.

14. The method according to claim 13, wherein, The battery pack in which either battery has a voltage greater than the first threshold is designated as the first battery pack, and the remaining battery pack is designated as the second battery pack. The first state further includes: Repeat 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 N1 times, where N1 is an integer greater than 1; and / or, Repeat the operation of the second battery pack discharging to the first energy storage circuit and the first energy storage circuit discharging to the first battery pack N2 times, where N2 is an integer greater than 1.

15. The method according to claim 13 or 14, wherein, The positive and negative terminals of the battery are respectively connected to an external charging device, and the negative terminals of the two battery packs are connected. The switching circuit includes: a first switch, which is connected to the positive terminals of the two battery packs; a first bridge arm, the two ends of which are respectively connected to the positive and negative terminals of one of the battery packs, and the midpoint of the first bridge arm is connected to the first end of the first energy storage circuit; and a second bridge arm, the two ends of which are respectively connected to the positive and negative terminals 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 method further includes: In response to the voltage of both battery packs being less than or equal to the first threshold, the first switch is controlled to close so that the charging device charges the battery; In response to the battery pack voltage being greater than the first threshold during charging, the first switch is controlled to open, and the battery is brought to 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, wherein, 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, which are respectively connected to the positive and negative terminals of the first group. The second bridge arm includes: a second upper bridge arm and a second lower bridge arm, which are respectively connected to the positive and negative terminals of the second group. The first state includes: The first operation and the second operation are performed alternately, so that the first group discharges to the first energy storage circuit and the first energy storage circuit discharges to the second group; The third and fourth operations are performed alternately, such 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, wherein, 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 also includes: The switching circuit enables the discharge of either of the two battery packs with a voltage greater than the first threshold to the second energy storage circuit, and the discharge of the second energy storage circuit to the remaining battery pack.

18. The method according to claim 17, wherein, 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 includes: Through the switching circuit, the first group discharges to the first energy storage circuit and the first group discharges to the second energy storage circuit simultaneously, as well as the first energy storage circuit discharges to the second group and the second energy storage circuit discharges to the second group simultaneously; and / or, The switching circuit simultaneously performs the second group discharging to the first energy storage circuit and the first group discharging to the second energy storage circuit, as well as simultaneously performs the first energy storage circuit discharging to the first group and the second energy storage circuit discharging to the first group.

19. The method according to claim 13 or 14, wherein, The positive and negative terminals of the battery are respectively connected to an external charging device. The two battery packs are connected in series. The switching circuit includes: a first bridge arm, a first end of which is connected to the positive terminal of the battery, and a second end of which is connected to the negative terminal of the battery. The midpoint of the first bridge arm is connected to the first terminal of the first energy storage circuit, and the second terminal 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 the first threshold, the charging device is controlled 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 brought into the first state via the first bridge arm and the first energy storage circuit.

20. The method according to claim 19, wherein, The first module further includes a second energy storage circuit, which is connected in parallel across the two ends of the battery. The first state also includes: The first bridge arm enables the discharge of either of the two battery packs with a voltage greater than the first threshold to the second energy storage circuit, and the second energy storage circuit to the discharge of the remaining battery pack.

21. The method according to claim 20, wherein, The battery pack in which either battery has a voltage greater than the first threshold is designated as the first battery pack, and the remaining battery pack is designated 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 simultaneously, as well as the first energy storage circuit discharges to the second battery pack and the first battery pack discharges to the second energy storage circuit simultaneously.

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