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

Abstract

The invention provides a battery control circuit, a battery system, a power utilization device and a battery charging control method, and belongs to the technical field of batteries. The control circuit comprises a first module connected with a battery, the battery comprises a first battery pack and a second battery pack, and the first battery pack and the second battery pack are respectively connected to an external charging device; the controller is configured to obtain the voltage of the first battery pack and the second battery pack when the battery is charged by the charging device, and control the first module to enable the first battery pack and the second battery pack to discharge mutually in response to the fact that the voltage of the first battery pack and / or the second battery pack is larger than a first threshold value; the controller is further configured to control the charging device to charge at least one of the first battery pack and the second battery pack during mutual discharge of the first battery pack and the second battery pack. The control circuit can improve the charging efficiency of the battery.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are 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 advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] During the charging or discharging process of the battery, polarization will occur due to the chemical reaction inside the battery and the influence of current movement. This polarization phenomenon may cause the battery energy density to decrease, the charging time to become longer, and the charging efficiency of the battery to be reduced. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the background technology. To this end, one purpose 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.

[0005] An embodiment of the first aspect of the present application provides a battery control circuit, comprising: a first module, connected to a battery, the battery comprising a first battery group and a second battery group, the first battery group and the second battery group being respectively connected to an external charging device; a controller, configured to: obtain the voltage of the first battery group and the second battery group during charging of the battery by the charging device, and in response to the voltage of the first battery group and / or the second battery group being greater than a first threshold, control the first module to cause the first battery group and the second battery group to discharge each other; the controller is also configured to: control the charging device to charge at least one of the first battery group and the second battery group during the mutual discharge of the first battery group and the second battery group.

[0006] In the technical solution of the embodiment of the present application, when the voltage of the first battery group and / or the second battery group is greater than the first threshold value, it indicates that the polarization voltage of the first battery group and / or the second battery group may be large and the polarization phenomenon is more serious. Based on this, by controlling the first module, the first battery group and the second battery group are discharged from each other to depolarize the battery. In the process of discharging, the charge accumulated on the electrodes of the first battery group and the second battery group can be quickly reduced, the polarization voltage can be reduced, and the polarization phenomenon can be improved. The charging device can charge the first battery group and / or the second battery group after depolarization with a large current to improve the charging efficiency of the battery. Due to the energy exchange between the first battery group and the second battery group, the power of the first battery group and the second battery group will not decrease or decrease very little after the depolarization is completed, thereby being able to ensure to a certain extent that the time for charging the first battery group and the second battery group again after the depolarization is completed is shortened. At the same time, during the mutual discharge between the first battery group and the second battery group, the charging device maintains charging at least one of the first battery group and / or the second battery group, so that the connection between the charging device and the battery can be maintained. After the depolarization is completed, the charging device can directly recharge the battery without executing the process of re-interaction between the charging device and the battery, thereby further shortening the charging time and improving the charging efficiency.

[0007] In some embodiments, the controller is configured to: during the period when the first battery group and the second battery group are discharging from each other, control the charging device to charge one of the first battery group or the second battery group. In this way, the first battery group or the second battery group that is not charged by the charging device during the period when the first battery group and the second battery group are discharging from each other will not accumulate charge due to being charged, which ensures that it has a better depolarization effect to a certain extent, thereby being able to better improve the depolarization of the battery while maintaining the connection between the charging device and the battery.

[0008] In some embodiments, the controller is configured to: perform a first process on the battery during the mutual discharge between the first battery group and the second battery group, the first process comprising: executing the discharge of the first battery group to the second battery group through the first module, wherein in the first process, the charging device is controlled to charge the first battery group. Since the battery discharge speed is faster than the charging speed, in the first process, while the first battery group is discharging to the second battery group, the charging device charges the first battery group, which can avoid the problem of the first battery group being depleted due to the excessively fast discharge speed to a certain extent.

[0009] In some embodiments, the controller is configured to: perform a second process on the battery during the mutual discharge between the first battery pack and the second battery pack, the second process comprising: executing the discharge of the second battery pack to the first battery pack through the first module, wherein, in the second process, the charging device is controlled to charge the second battery pack. In the second process, the charging device charges the second battery pack, which can avoid the problem of power loss of the second battery pack due to excessive discharge speed to a certain extent, and is conducive to maintaining the normal performance of the first battery pack and the second battery pack, so as to improve the charging efficiency.

[0010] In some embodiments, the first module includes: a switch circuit connected to a battery; a first energy storage circuit connected to the switch circuit and connected to the battery through the switch circuit; the controller is configured to: during the mutual discharge between the first battery group and the second battery group, perform N1 times of the first battery group discharging to the first energy storage circuit and the first energy storage circuit discharging to the second battery group through the switch circuit, so that the first battery group discharges to the second battery group, N1 is an integer greater than or equal to 1; and perform N2 times of the second battery group discharging to the first energy storage circuit and the first energy storage circuit discharging to the first battery group through the switch circuit, so that the second battery group discharges to the first battery group, N2 is an integer greater than or equal to 1. The first energy storage circuit plays the role of temporarily storing energy. Through the first energy storage circuit, the discharge speed of the first battery group and the second battery group can be controlled so that the discharge amount of the first battery group and the second battery group each time is not too much, reducing the probability of the first battery group and the second battery group being out of power. At the same time, through the switching circuit and the first energy storage circuit, the first battery group can discharge to the second battery group multiple times, and the second battery group can discharge to the first battery group multiple times, thereby extending the time for the first battery group and the second battery group to discharge each other, thereby enhancing the depolarization effect of the first battery group and the second battery group.

[0011] In some embodiments, the negative electrode of the first battery group is connected to the negative electrode of the second battery group, and the switching circuit includes: a first bridge arm, a first end of the first bridge arm is connected to the positive electrode of the first battery group, and a second end is connected to the negative electrode of the first battery group, and a second bridge arm, a first end of the second bridge arm is connected to the positive electrode of the second battery group, and a second end is connected to the second end of the first bridge arm; the first end of the first energy storage circuit is connected to the midpoint of the first bridge arm, and the second end is connected to the midpoint of the second bridge arm, and the controller is configured to: in response to the voltage of the first battery group and the second battery group being less than or equal to the first threshold, control the charging device to charge the first battery group and the second battery group; in response to the voltage of the first battery group and / or the second battery group being greater than the first threshold during charging, control the first battery group and the second battery group to discharge each other through the first bridge arm, the second bridge arm and the first energy storage circuit. That is to say, the first ends of the first bridge arm and the second bridge arm are respectively connected to the positive electrodes of the first battery group and the second battery group, the second ends of the first bridge arm and the second bridge arm are both connected to the negative electrodes of the first battery group and the second battery group, and the first energy storage circuit is connected between the midpoint of the first bridge arm and the midpoint of the second bridge arm. In this way, through the first bridge arm and the second bridge arm, the first energy storage circuit can form a loop with the first battery group and the second battery group respectively, so that the first battery group and the second battery group can discharge each other through the first energy storage circuit to reduce the voltage of the first battery group and the second battery group. When the voltage of the first battery group and / or the second battery group is less than or equal to the first threshold value, the charging device can be controlled to charge the battery with a large current.

[0012] In some embodiments, the first bridge arm includes: a first upper bridge arm and a first lower bridge arm, the first upper bridge arm is connected to the positive electrode of the first battery group, and the first lower bridge arm is connected to the negative electrode of the first battery group, the second bridge arm includes: a second upper bridge arm and a second lower bridge arm, the second upper bridge arm is connected to the positive electrode of the second battery group, and the second lower bridge arm is connected to the negative electrode of the second battery group, and the controller is configured to: alternately perform the first operation and the second operation so that the first battery group discharges to the second battery group, 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; alternately perform the third operation and the fourth operation so that the second battery group discharges to the first battery group, 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, and the fourth operation includes: controlling the first upper bridge arm and the second upper bridge arm to be turned on, and the first lower bridge arm and the second lower bridge arm to be turned off. In this way, during the process of the first energy storage circuit discharging to the second battery group, the first energy storage circuit, the first battery group and the second battery group can form a loop, and the first battery group can continue to discharge to the first energy storage circuit, further improving the depolarization effect on the first battery group. In addition, it is also possible to make the voltage of the first battery group and the first energy storage circuit connected in series greater than the voltage of the second battery group, thereby improving the success rate of the first energy storage circuit discharging smoothly to the second battery group. Similarly, during the process of the first energy storage circuit discharging to the first battery group, the first energy storage circuit, the first battery group and the second battery group can form a loop, and the second battery group can continue to discharge to the first energy storage circuit, thereby improving the success rate of the first energy storage circuit discharging smoothly to the first battery group and improving the depolarization effect on the second battery group.

[0013] In some embodiments, the battery control circuit further includes: a first switch, connecting the positive electrode of the first battery group and the positive electrode of the second battery group; the controller is configured to: in response to the voltage of the first battery group and the second battery group being less than or equal to the first threshold, control the first switch to close, and control the charging device to charge the first battery group and the second battery group; in response to the voltage of the first battery group and the second battery group being greater than the first threshold during charging, control the first switch to open, so that the charging device charges the first battery group or the second battery group, and controls the first battery group and the second battery group to discharge each other through the first bridge arm, the second bridge arm and the first energy storage circuit. During charging, the first switch is closed, so that the first battery group and the second battery group are connected in parallel, and then the first battery group and the second battery group can be charged simultaneously through any one of the first output terminal and the second output terminal, and the voltage of the first battery group and the second battery group is consistent, which is conducive to maintaining the energy balance of the first battery group and the second battery group during charging and maintaining stable battery performance. When it is detected that the voltage of any one of the first battery group and the second battery group is greater than the first threshold, the first switch is disconnected, that is, the first battery group and the second battery group are not in parallel relationship, so that the first battery group and the second battery group can form a charging and discharging circuit through the first bridge arm and the second bridge arm respectively, thereby realizing depolarization of the battery. That is, by turning on and off the first switch, the charging state and the depolarization state of the battery can be switched.

[0014] In some embodiments, a second energy storage circuit is also connected in parallel at both ends of the first battery group, and the controller is further configured to: during the mutual discharge between the first battery group and the second battery group, perform N3 times of the first battery group discharging to the second energy storage circuit and the second energy storage circuit discharging to the second battery group through the switch circuit, N3 is an integer greater than or equal to 1; and / or during the mutual discharge between the first battery group and the second battery group, perform N4 times of the first battery group discharging to the second energy storage circuit and the second energy storage circuit discharging to the first battery group through the switch circuit, N4 is an integer greater than or equal to 1. The second energy storage circuit can also realize the discharge of the first battery group to the second battery group, and / or the discharge of the second battery group to the first battery group, thereby improving the depolarization effect on the battery.

[0015] In some embodiments, the controller is further configured to: during the discharge of the first battery group to the second battery group, through the switch circuit, simultaneously execute the discharge of the first battery group to the first energy storage circuit and the first battery group to the second energy storage circuit, and simultaneously execute the discharge of the first energy storage circuit to the second battery group and the discharge of the second energy storage circuit to the second battery group; during the discharge of the second battery group to the first battery group, through the switch circuit, simultaneously execute the discharge of the second battery group to the first energy storage circuit and the first battery group to the second energy storage circuit, and simultaneously execute the discharge of the first energy storage circuit to the first battery group and the discharge of the second energy storage circuit to the first battery group. Thus, the first battery group can exchange energy with the second energy storage circuit, increase the discharge amount of the first battery group in a short time, improve the discharge efficiency of the first battery group, and further improve the depolarization effect.

[0016] In some embodiments, the first energy storage circuit includes at least one inductor, and the second energy storage circuit includes a capacitor. The inductor can store a large amount of electricity, which can improve the energy transfer efficiency between the first battery group and the second battery group, so that the battery has a better depolarization effect. The capacitor has a small volume, and the capacitor can achieve fast charging and discharging, while further improving the depolarization effect on the battery, keeping the volume of the battery control circuit small, reducing the weight of the battery control circuit, and reducing the cost.

[0017] An embodiment of the second aspect of the present application provides a battery system, which includes the battery control circuit in the above embodiment.

[0018] An embodiment of the third aspect of the present application provides an electrical device, which includes the battery system in the above embodiment, and the battery system is used to provide electrical energy.

[0019] An embodiment of the fourth aspect of the present application provides a battery charging control method, wherein the battery comprises a first battery group and a second battery group, wherein the first battery group and the second battery group are respectively connected to an external charging device, and the battery is also connected to a first module, and the method comprises: obtaining the voltage of the first battery group and the second battery group during charging of the battery by the charging device; in response to the voltage of the first battery group and / or the second battery group being greater than a first threshold, controlling the first module to cause the first battery group and the second battery group to discharge each other; wherein, during the period of mutual discharge between the first battery group and the second battery group, controlling the charging device to charge at least one of the first battery group and the second battery group.

[0020] In the above technical solution, during the discharge process, the charge accumulated on the electrodes of the first battery group and the second battery group can be quickly reduced, the polarization voltage can be reduced, and the polarization phenomenon can be improved, so that the first battery group and / or the second battery group after depolarization can be charged with a large current. At the same time, during the mutual discharge between the first battery group and the second battery group, the charging device maintains charging at least one of the first battery group and / or the second battery group, so that the connection between the charging device and the battery can be maintained. After the depolarization is completed, the charging device can directly recharge the battery without executing the process of re-interacting the charging device with the battery, further shortening the charging time and improving the charging efficiency.

[0021] In some embodiments, during the mutual discharge between the first battery group and the second battery group, the charging current of the charging device to the first battery group or the second battery group is controlled to be smaller than the discharge current of the first battery group to the second battery group, and smaller than the discharge current of the second battery group to the first battery group. In this way, it can be ensured to a certain extent that the amount of charge accumulated on the electrodes of the first battery group or the second battery group when the charging device charges the first battery group or the second battery group is smaller than the amount of charge released by the first battery group and the second battery group during the discharge process, so that the first battery group and the second battery group have a better depolarization effect, and the depolarization phenomenon of the battery is improved.

[0022] In some embodiments, during the period when the first battery group and the second battery group are mutually discharged, controlling the charging device to charge at least one of the first battery group and the second battery group includes: during the period when the first battery group and the second battery group are mutually discharged, controlling the charging device to charge one of the first battery group or the second battery group. In this way, the first battery group or the second battery group that is not charged by the charging device during the period when the first battery group and the second battery group are mutually discharged will not accumulate charge due to being charged, which ensures that it has a better depolarization effect to a certain extent, thereby being able to better improve the depolarization of the battery while maintaining the connection between the charging device and the battery.

[0023] In some embodiments, making the first battery pack and the second battery pack discharge each other includes performing a first process on the battery, the first process including: performing the discharge of the first battery pack to the second battery pack through the first module; during the mutual discharge of the first battery pack and the second battery pack, controlling the charging device to charge at least one of the first battery pack and the second battery pack includes: in the first process, controlling the charging device to charge the first battery pack. Thus, the problem of power loss of the first battery pack due to excessive discharge speed can be avoided to a certain extent, which is conducive to maintaining the normal performance of the first battery pack and improving the charging efficiency.

[0024] In some embodiments, making the first battery pack and the second battery pack discharge each other includes performing a second process on the battery, the second process including: executing the second battery pack to discharge the first battery pack through the first module; during the period when the first battery pack and the second battery pack discharge each other, controlling the charging device to charge at least one of the first battery pack and the second battery pack includes: in the second process, controlling the charging device to charge the second battery pack. Thus, the problem of the second battery pack being depleted due to excessive discharge speed can be avoided to a certain extent, which is conducive to maintaining the normal performance of the second battery pack and improving the charging efficiency.

[0025] In some embodiments, the negative electrode of the first battery group is connected to the negative electrode of the second battery group, and the first module includes: a switch circuit and a first energy storage circuit, the switch circuit is connected to the battery, and the first energy storage circuit is connected to the switch circuit; the first module is controlled to make the first battery group and the second battery group discharge each other, including: through the switch circuit, performing N1 times of the operation of the first battery group discharging to the first energy storage circuit and the first energy storage circuit discharging to the second battery group, so that the first battery group discharges to the second battery group, N1 is an integer greater than or equal to 1; through the switch circuit, performing N2 times of the operation of the second battery group discharging to the first energy storage circuit and the first energy storage circuit discharging to the first battery group, so that the second battery group discharges to the first battery group, N2 is an integer greater than or equal to 1. The first energy storage circuit plays the role of temporarily storing energy. Through the first energy storage circuit, the discharge speed of the first battery group and the second battery group can be controlled, so that the discharge amount of the first battery group and the second battery group each time is not too much, reducing the probability of the first battery group and the second battery group being out of power. At the same time, through the switching circuit and the first energy storage circuit, the first battery group can discharge to the second battery group multiple times, and the second battery group can discharge to the first battery group multiple times, thereby extending the time for the first battery group and the second battery group to discharge each other, thereby enhancing the depolarization effect of the first battery group and the second battery group.

[0026] In some embodiments, the switching circuit includes: a first bridge arm and a second bridge arm, the first end of the first bridge arm is connected to the positive electrode of the first battery group, and the second end is connected to the negative electrode of the first battery group, the first end of the second bridge arm is connected to the positive electrode of the second battery group, and the second end is connected to the second end of the first bridge arm; the first end of the first energy storage circuit is connected to the midpoint of the first bridge arm, and the second end is connected to the midpoint of the second bridge arm, and the method also includes: in response to the voltage of the first battery group and the second battery group being less than or equal to a first threshold, controlling the charging device to charge the first battery group and the second battery group; wherein, in response to the voltage of the first battery group and / or the second battery group being greater than the first threshold, controlling the first module to discharge the first battery group and the second battery group from each other, including: in response to the voltage of the first battery group and / or the second battery group being greater than the first threshold during charging, controlling the first battery group and the second battery group to discharge from each other through the first bridge arm, the second bridge arm and the first energy storage circuit. In this way, through the first bridge arm and the second bridge arm, the first energy storage circuit can form a loop with the first battery group and the second battery group respectively, so that the first battery group and the second battery group can discharge each other through the first energy storage circuit to reduce the voltage of the first battery group and the second battery group. When the voltage of the first battery group and / or the second battery group is less than or equal to the first threshold value, the charging device can be controlled to charge the battery with a large current.

[0027] In some embodiments, the first bridge arm includes: a first upper bridge arm and a first lower bridge arm, the first upper bridge arm is connected to the positive electrode of the first battery group, and the first lower bridge arm is connected to the negative electrode of the first battery group, the second bridge arm includes: a second upper bridge arm and a second lower bridge arm, the second upper bridge arm is connected to the positive electrode of the second battery group, and the second lower bridge arm is connected to the negative electrode of the second battery group, and the discharge of the first battery group to the second battery group includes: alternately performing a first operation and a second operation, 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, and 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 discharge of the second battery group to the first battery group includes: alternately performing a third operation and a fourth operation, 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, and the fourth operation includes: controlling the first upper bridge arm and the second upper bridge arm to be turned on, and the first lower bridge arm and the second lower bridge arm to be turned off. In this way, during the process of the first energy storage circuit discharging to the second battery group, the first energy storage circuit, the first battery group and the second battery group can form a loop, and the first battery group can continue to discharge to the first energy storage circuit, further improving the depolarization effect on the first battery group. Similarly, during the process of the first energy storage circuit discharging to the first battery group, the first energy storage circuit, the first battery group and the second battery group can form a loop, and the second battery group can continue to discharge to the first energy storage circuit, improving the depolarization effect on the second battery group.

[0028] In some embodiments, the positive electrode of the first battery group and the positive electrode of the second battery group are connected through a first switch, and in response to the voltage of the first battery group and the second battery group being less than or equal to a first threshold, the charging device is controlled to charge the first battery group and the second battery group, including: controlling the first switch to close, and controlling the charging device to charge the first battery group and the second battery group; in response to the voltage of the first battery group and / or the second battery group being greater than the first threshold, controlling the first module to discharge the first battery group and the second battery group from each other, including: in response to the voltage of the first battery group and the second battery group being greater than the first threshold during charging, controlling the first switch to open; controlling the charging device to charge the first battery group or the second battery group, and controlling the first battery group and the second battery group to discharge from each other through the first bridge arm, the second bridge arm and the first energy storage circuit. By turning the first switch on and off, the charging state and the depolarization state of the battery can be switched.

[0029] In some embodiments, during the mutual discharge between the first battery group and the second battery group, when the charging device is controlled to charge the first battery group, the discharge of the first battery group to the second battery group further includes: controlling the sum of the charging current of the charging device to the first battery group and the discharge current of the first battery group to be equal to the discharge current of the first energy storage circuit to the second battery group; the discharge of the second battery group to the first battery group further includes: controlling the sum of the charging current of the charging device to the first battery group and the discharge current of the first energy storage circuit to the first battery group to be equal to the discharge current of the second battery group; or, during the mutual discharge between the first battery group and the second battery group, when the charging device is controlled to charge the second battery group, the discharge of the first battery group to the second battery group further includes: controlling the sum of the charging current of the charging device to the second battery group and the discharge current of the first energy storage circuit to the second battery group to be equal to the discharge current of the first battery group; the discharge of the second battery group to the first battery group further includes: controlling the sum of the charging current of the charging device to the second battery group and the discharge current of the second battery group to be equal to the sum of the discharge current of the first energy storage circuit to the first battery group. In this way, during the mutual discharge between the first battery group and the second battery group, the voltages of the first battery group and the second battery group are as close as possible, which is beneficial to maintaining the stability of the first battery group and the second battery group when the battery continues to be charged after depolarization.

[0030] In some embodiments, a second energy storage circuit is further connected in parallel at both ends of the first battery group, and the method further includes: during the mutual discharge between the first battery group and the second battery group, the first battery group discharges to the second energy storage circuit and the second energy storage circuit discharges to the second battery group N3 times through the switch circuit, N3 is an integer greater than or equal to 1; and / or during the mutual discharge between the first battery group and the second battery group, the first battery group discharges to the second energy storage circuit and the second energy storage circuit discharges to the first battery group N4 times through the switch circuit, N4 is an integer greater than or equal to 1. The second energy storage circuit can also realize the discharge of the first battery group to the second battery group, and / or the discharge of the second battery group to the first battery group, thereby improving the depolarization effect on the battery.

[0031] In some embodiments, during the discharge of the first battery group to the second battery group, the method further includes: through a switch circuit, the first battery group discharges to the first energy storage circuit and the first battery group discharges to the second energy storage circuit at the same time, and the first energy storage circuit discharges to the second battery group and the second energy storage circuit discharges to the second battery group at the same time; during the discharge of the second battery group to the first battery group, the method further includes: through a switch circuit, the second battery group discharges to the first energy storage circuit and the first battery group discharges to the second energy storage circuit at the same time, and the first energy storage circuit discharges to the first battery group and the second energy storage circuit discharges to the first battery group at the same time. The first battery group can exchange energy with the second energy storage circuit, which can increase the discharge amount of the first battery group in a short time, improve the discharge efficiency of the first battery group, and further improve the depolarization effect.

[0032] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0034] Figure 1 This is one of the functional block diagrams of the battery control circuit in some embodiments of the present application; Figure 2 This is the second functional block diagram of the battery control circuit of some embodiments of the present application; Figure 3 One of the current waveform diagrams passing through the first energy storage circuit during the mutual discharge between the first battery group and the second battery group in some embodiments of the present application; Figure 4 The second current waveform diagram of the first energy storage circuit during the mutual discharge between the first battery group and the second battery group in some embodiments of the present application; Figure 5 This is one of the structural schematic diagrams of the battery control circuit in some embodiments of the present application; Figure 6 One of the current path schematic diagrams during the discharge of the first battery pack to the second battery pack in some embodiments of the present application; Figure 7 This is a second schematic diagram of a current path during discharge from a first battery pack to a second battery pack in some embodiments of the present application; Figure 8 One of the current path schematic diagrams during the discharge of the second battery pack to the first battery pack in some embodiments of the present application; Fig. 9 This is a second schematic diagram of a current path during discharge of the second battery pack to the first battery pack in some embodiments of the present application; Fig.10 This is the second structural schematic diagram of the battery control circuit of some embodiments of the present application; Fig.11 This is the third structural schematic diagram of the battery control circuit of some embodiments of the present application; Fig.12 This is one of the flow charts of the battery charging control method in some embodiments of the present application; Fig.13 This is the second flowchart of the battery charging control method according to some embodiments of the present application.

[0035] Description of reference numerals: A switch circuit 1011, a first energy storage circuit 1012, and a second energy storage circuit 1013; Battery 100, first module 101, charging device 102, controller 103; A first battery pack 11, a second battery pack 12, a first bridge arm 20, a second bridge arm 21, a current sensor 23, a first connector 24, and a 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, first charging positive relay K11, second charging positive relay K21, charging negative relay K12, first upper bridge arm switch tube V1, first lower bridge arm switch tube V2, second upper bridge arm switch tube V3, second lower bridge arm switch tube V4. DETAILED DESCRIPTION

[0036] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0038] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0039] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0040] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0041] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0042] Polarization occurs during the charging or discharging process of the battery. In some cases, one of the reasons for the battery polarization phenomenon is that when a large current flows through the electrode, charges will accumulate on the positive and negative electrodes of the battery, causing the electrode potential to deviate from the equilibrium potential, resulting in a difference between the actual potential of the battery and the equilibrium potential. This difference leads to a polarization voltage, and the greater the charging current, the more charges accumulate on the electrode, and the greater the polarization voltage. The presence of polarization voltage increases the resistance of the battery, making the current flowing through the battery smaller, thereby reducing the charging efficiency of the battery.

[0043] The magnitude of the polarization voltage is proportional to the actual potential of the battery, that is, proportional to the voltage across the battery. During the charging process, when the battery voltage is too high, a more serious polarization phenomenon may have occurred, thereby reducing the charging efficiency of the battery.

[0044] Based on the above considerations, a battery control circuit is designed. The battery includes a first battery group and a second battery group connected, and the first battery group and the second battery group are respectively connected to a first output terminal and a second output terminal of a charging device.

[0045] When the voltage of the first battery group and / or the second battery group is greater than the first threshold, it indicates that the polarization voltage of the first battery group and / or the second battery group may be large and the polarization phenomenon is more serious. Based on this, in response to the voltage of the first battery group and / or the second battery group being greater than the first threshold, the controller controls the first module to discharge the first battery group and the second battery group to each other. During the discharge process, the charge accumulated on the electrodes of the first battery group and the second battery group can be quickly reduced, the polarization voltage can be reduced, and the polarization phenomenon can be improved. The charging device can charge the first battery group and / or the second battery group after depolarization with a large current to improve the charging efficiency of the battery.

[0046] Due to the energy exchange between the first battery group and the second battery group, the first battery group and the second battery group discharge each other, and the power of the first battery group and the second battery group will not decrease or will decrease very little, thereby ensuring to a certain extent that after the first battery group and the second battery group discharge each other, the time for charging the first battery group and the second battery group again is shortened.

[0047] At the same time, during the mutual discharge between the first battery group and the second battery group, the charging device maintains charging at least one of the first battery group and / or the second battery group, so that the connection between the charging device and the battery can be maintained. After the depolarization is completed, the charging device can directly recharge the battery without executing the process of re-interaction between the charging device and the battery, thereby further shortening the charging time and improving the charging efficiency.

[0048] The battery control circuit disclosed in the embodiment of the present application can be used, but is not limited to, for charging batteries in electrical devices such as vehicles, ships or aircraft.

[0049] The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0050] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0051] The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle, etc. A battery is arranged inside the vehicle, and the battery may be arranged at the bottom, head or tail of the vehicle. The battery may be used to power the vehicle, for example, the battery may be used as an operating power source for the vehicle.

[0052] In some embodiments of the present application, the battery can be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0053] refer to Figure 1 , the embodiment of the present application provides a battery control circuit, including: a first module 101, connected to a battery 100, the battery 100 includes a first battery group 11 and a second battery group 12, the first battery group 11 and the second battery group 12 are respectively connected to an external charging device 102. The battery control circuit also includes: a controller 103, configured to: obtain the voltage of the first battery group 11 and the second battery group 12 during the period when the charging device 102 charges the battery 100, and in response to the voltage of the first battery group 11 and / or the second battery group 12 being greater than a first threshold, control the first module 101 to discharge the first battery group 11 and the second battery group 12 from each other; the controller 103 is also configured to: during the period when the first battery group 11 and the second battery group 12 discharge from each other, control the charging device 102 to charge at least one of the first battery group 11 and the second battery group 12.

[0054] The first battery group 11 and the second battery group 12 can be connected in series or in parallel. The first module 101 is connected to the positive and negative electrodes of the first battery group 11, and to the positive and negative electrodes of the second battery group 12, so as to form a loop with the first battery group 11 and the second battery group 12, respectively, to achieve the discharge of the first battery group 11 and the second battery group 12. By controlling the first module 101, the first battery group 11 and the second battery group 12 are discharged from each other, so as to achieve the depolarization of the battery 100.

[0055] In some embodiments, the controller 103 may control the first module in response to the voltage of one of the first battery group 11 or the second battery group 12 being greater than the first threshold value, so that the first battery group and the second battery group discharge each other. It can be understood that the discharge of the first battery group 11 to the second battery group 12 is equivalent to the charging of the second battery group 12, and the discharge of the second battery group 12 to the first battery group 11 is equivalent to the charging of the first battery group 11. Since the first battery group 11 and the second battery group 12 exchange energy during the mutual discharge between the first battery group 11 and the second battery group 12, that is, the first battery group 11 and the second battery group 12 both include the process of being charged and discharged, so that the voltage of the first battery group 11 and the second battery group 12 is less than or equal to the first threshold value during the mutual discharge, the problem of the voltage value being increased due to being charged will not occur, thereby achieving a better depolarization effect on the battery 100 as a whole.

[0056] In some other embodiments, the controller 103 may also cause the first battery group 11 and the second battery group 12 to discharge each other in response to the voltages of the first battery group 11 and the second battery group 12 being greater than the first threshold.

[0057] It is understandable that during charging, if the first battery group 11 and the second battery group 12 are connected in series, the controller 103 can respond to the voltage of at least one of the first battery group 11 or the second battery group 12 being greater than the first threshold value, so that the first battery group 11 and the second battery group 12 discharge each other. If the first battery group 11 and the second battery group 12 are connected in parallel during charging, the controller 103 responds to the voltage of the first battery group 11 and the second battery group 12 being greater than the first threshold value, so that the first battery group 11 and the second battery group 12 discharge each other.

[0058] The first threshold value may be a specific voltage value or a range value. The first threshold value may be adjusted according to the type of battery 100. The method for setting the first threshold value may be to test the relationship between the charging rate of battery 100 and the voltage of the first battery group 11 and the second battery group 12 in advance. When the voltage of the first battery group 11 and the second battery group 12 is lower than a certain value or within a certain range value, the charging rate is significantly reduced, and the voltage value or range value may be set as the first threshold value. Exemplarily, the first threshold value may be 80% of the voltage when the battery group 100 is fully charged.

[0059] The charging device 102 may include, but is not limited to, a charging station or other device capable of charging the battery 100 .

[0060] In some embodiments, the first battery pack 11 can be connected to the first output terminal of the charging device 102, and the second battery pack 12 can be connected to the second output terminal of the charging device 102. The first output terminal of the charging device 102 can include a first positive terminal and a first negative terminal, and the second output terminal of the charging device 102 can include a second positive terminal and a second negative terminal. The first positive terminal and the first negative terminal can be connected to the positive electrode and the negative electrode of the first battery pack 11, respectively, and the second positive terminal and the second negative terminal can be connected to the positive electrode and the negative electrode of the second battery pack 12, respectively.

[0061] In other embodiments, the first output terminal may include a first positive terminal, the second output terminal may include a second positive terminal, the charging device 102 further includes a negative terminal, and the first output terminal and the second output terminal may share the same negative terminal. That is, the first positive terminal is connected to the positive electrode of the first battery pack 11, the second positive terminal is connected to the positive electrode of the second battery pack 12, and the negative electrode of the first battery pack 11 and the negative electrode of the second battery pack 12 are both connected to the negative terminal.

[0062] The charging device 102 can output voltage and current through the first positive terminal and the second positive terminal respectively to charge the first battery group 11 and the second battery group 12 respectively.

[0063] In some embodiments, the charging device 102 may include a power module, which is used to adjust the current and voltage output by the charging device 102 to match the charging requirements of the battery 100. In some embodiments, the first positive terminal, the second positive terminal and the negative terminal or the first negative terminal and the second negative terminal may all be output terminals of the power module.

[0064] By providing the first output terminal and the second output terminal, it is possible to charge at least one of the first battery group 11 or the second battery group 12 during the mutual discharge of the first battery group 11 and the second battery group 12 .

[0065] In some embodiments, during the normal charging process of the charging device 102 for the first battery group 11 and the second battery group 12, the charging device 102 may also charge the first battery group 11 and the second battery group 12 respectively through the first output terminal and the second output terminal. Alternatively, when the first battery group 11 and the second battery group 12 are connected in parallel, the charging device 102 may also charge the first battery group 11 and the second battery group 12 simultaneously through the first output terminal or the second output terminal.

[0066] Before charging the battery 100, the charging device 102 usually needs to interact with the battery 100. The interaction process may include a charging handshake phase and a charging configuration phase.

[0067] Exemplarily, in the process of charging the battery 100 of the vehicle, before the charging pile charges the battery 100, the charging pile needs to enter the handshake stage with the battery 100. The handshake stage refers to the establishment of a communication connection between the charging pile and the battery 100 and the negotiation of charging parameters. The handshake stage can generally include a handshake startup stage and a handshake identification stage. For example, the charging pile can send a handshake startup message to the BMS. After receiving the handshake startup message, the BMS replies with a confirmation within a specified time, indicating that charging is ready. Then enter the handshake identification stage, which is mainly used for information exchange and identity authentication.

[0068] Since the interaction process between the charging device 102 and the battery 100 is a fixed process, each time the charging device 102 disconnects from the battery 100, if charging is required, it is necessary to interact again, that is, it is necessary to re-enter the handshake stage, which consumes a lot of time, resulting in a complicated charging process and a long time consumption.

[0069] Based on this, in the embodiment of the present application, during the period when the first battery group 11 and the second battery group 12 discharge each other, the connection between the charging device 102 and at least one of the first battery group 11 or the second battery group 12 is maintained, that is, the connection between the charging device 102 and the battery 100 is maintained, so that when charging is subsequently restarted, the handshake stage will not be re-entered because it is detected that the charging device 102 and the battery group 100 remain connected.

[0070] The controller 103 may include, but is not limited to, a microcontroller unit (MCU) of a vehicle, or a controller 103 in a battery management system (BMS) of the battery 100 .

[0071] In some embodiments, the battery 100 further includes a voltage sensor, which is used to detect the voltage of the first battery group 11 and the second battery group 12. The voltage sensor is connected to the BMS for communication, and the controller 103 in the BMS can receive the voltage information of the first battery group 11 and the second battery group 12 detected by the voltage sensor, and in response to the voltage of the first battery group 11 and / or the second battery group 12 being greater than the first threshold, send a message to the charging device 102 for the period of mutual discharge between the first battery group 11 and the second battery group 12, and control the first module 101 to make the first battery group 11 and the second battery group 12 discharge each other. After receiving the message for mutual discharge between the first battery group 11 and the second battery group 12, the charging device 102 performs charging of at least one of the first battery group 11 and / or the second battery group 12.

[0072] In some embodiments, the first module 101 may include but is not limited to components with charging and discharging functions such as capacitors and inductors. Capacitors or inductors both have the function of charging and discharging. When one of the first battery group 11 or the second battery group 12 forms a loop with the first module 101, it can temporarily store the electric energy released by one of the first battery group 11 or the second battery group 12. After the other of the first battery group 11 and the second battery group 12 forms a loop with the first module 101, the capacitor or inductor releases energy to the other of the first battery group 11 and the second battery group 12, thereby realizing the discharge of the first battery group 11 to the second battery group 12, or the discharge of the second battery group 12 to the first battery group 11.

[0073] In the above technical solution, during the discharge process, the charges accumulated on the electrodes of the first battery group 11 and the second battery group 12 can be quickly reduced, the polarization voltage can be reduced, and the polarization phenomenon can be improved. The charging device 102 can charge the first battery group 11 and / or the second battery group 12 after depolarization with a large current, thereby improving the charging efficiency of the battery 100. Due to the energy exchange between the first battery group 11 and the second battery group 12, the power of the first battery group 11 and the second battery group 12 will not decrease or will decrease very little after the first battery group 11 and the second battery group 12 discharge each other, which can avoid to a certain extent the problem of excessive discharge of the first battery group 11 and the second battery group 12 during the mutual discharge process, resulting in too low power, which increases the charging time. At the same time, during the mutual discharge between the first battery group 11 and the second battery group 12, the charging device 102 maintains charging of at least one of the first battery group 11 and / or the second battery group 12, so that the connection between the charging device 102 and the battery 100 can be maintained. After the mutual discharge is completed, the charging device 102 can directly recharge the battery 100 without executing the process of re-interacting the charging device 102 with the battery 100, thereby further shortening the charging time and improving the charging efficiency.

[0074] According to some embodiments of the present application, the controller 103 is configured to control the charging device 102 to charge one of the first battery pack 11 or the second battery pack 12 during the mutual discharge between the first battery pack 11 and the second battery pack 12 .

[0075] Exemplarily, the controller 103 is configured to charge the first battery group 11 through the first output terminal during the mutual discharge between the first battery group 11 and the second battery group 12. Alternatively, the second battery group 12 is charged through the second output terminal during the mutual discharge between the first battery group 11 and the second battery group 12. It is worth noting that during the period when the charging device 102 charges the first battery group 11 or the second battery group 12 through one of the first output terminal or the second output terminal, the other of the first output terminal or the second output terminal is disconnected from the corresponding first battery group 11 or the second battery group 12.

[0076] In the above technical solution, the first battery group 11 or the second battery group 12 that is not charged by the charging device 102 during the mutual discharge between the first battery group 11 and the second battery group 12 will not accumulate charge due to being charged, which ensures that it has a good depolarization effect to a certain extent, thereby being able to better improve the depolarization of the battery 100 while maintaining the connection between the charging device 102 and the battery 100.

[0077] According to some embodiments of the present application, the controller 103 is configured to: perform a first process on the battery 100 during the mutual discharge between the first battery group 11 and the second battery group 12, the first process comprising: executing the discharge of the first battery group 11 to the second battery group 12 through the first module 101, wherein, in the first process, the charging device 102 is controlled to charge the first battery group 11.

[0078] The controller 103 may control the charging device 102 to charge the first battery pack 11 through the first output terminal in the first process by sending a message of the first process to the charging device 102 .

[0079] In the above technical solution, since the discharge speed of the battery 100 is faster than the charging speed, in the first process, while the first battery group 11 discharges to the second battery group 12, the charging device 102 charges the first battery group 11, which can avoid the problem of the first battery group 11 running out of power due to excessive discharge speed to a certain extent.

[0080] According to some embodiments of the present application, the controller 103 is configured to: perform a second process on the battery 100 during the mutual discharge between the first battery group 11 and the second battery group 12, the second process comprising: executing the discharge of the second battery group 12 to the first battery group 11 through the first module 101, wherein, in the second process, the charging device 102 is controlled to charge the second battery group 12.

[0081] In some embodiments, during the mutual discharge between the first battery pack 11 and the second battery pack 12 , the first process and the second process may be performed. For example, the first process and the second process may be performed alternately.

[0082] The controller 103 may control the charging device 102 to charge the second battery pack 12 through the second output terminal in the first process by sending a message of the second process to the charging device 102 .

[0083] In the above technical solution, in the second process, the charging device 102 charges the second battery pack 12, which can avoid the problem of the second battery pack 12 running out of power due to excessive discharge speed to a certain extent, which is beneficial to maintaining the normal performance of the second battery pack 12 to improve the charging efficiency.

[0084] It is understandable that in other embodiments, during the mutual discharge between the first battery group 11 and the second battery group 12, only the first process may be performed, and in the first process, the charging device 102 is controlled to charge the first battery group 11. Alternatively, during the mutual discharge between the first battery group 11 and the second battery group 12, only the second process may be performed, and in the second process, the charging device 102 is controlled to charge the second battery group 12.

[0085] refer to Figure 2 According to some embodiments of the present application, the first module 101 includes: a switch circuit 1011, connected to the battery 100; a first energy storage circuit 1012, connected to the switch circuit 1011, and connected to the battery 100 through the switch circuit 1011; the controller 103 is configured to: during the mutual discharge between the first battery group 11 and the second battery group 12, perform N1 operations of discharging the first battery group 11 to the first energy storage circuit 1012 and discharging the first energy storage circuit 1012 to the second battery group 12 through the switch circuit 1011, so that the first battery group 11 discharges to the second battery group 12, N1 is an integer greater than or equal to 1; and, perform N2 operations of discharging the second battery group 12 to the first energy storage circuit 1012 and discharging the first energy storage circuit 1012 to the first battery group 11 through the switch circuit 1011, so that the second battery group 12 discharges to the first battery group 11, N2 is an integer greater than or equal to 1.

[0086] Through the switch circuit 1011, the first battery group 11 and the first energy storage circuit 1012 form a loop, and the first energy storage circuit 1012 and the second battery group 12 form a loop. The first energy storage circuit 1012 plays a role of temporarily storing energy. Through the first energy storage circuit 1012, the mutual discharge of the first battery group 11 and the second battery group 12 is realized. Exemplarily, the first battery group 11 can be connected in series with the second battery group 12, and the switch circuit 1011 may include a first bridge arm, and the first bridge arm may include a first upper bridge arm and a first lower bridge arm connected in series. The first upper bridge arm is connected to the positive electrode of the battery 100, and the first lower bridge arm is connected to the negative electrode of the battery 100. The node between the first upper bridge arm and the first lower bridge arm is connected to the first end of the first energy storage circuit 1012, and the second end of the first energy storage circuit 1012 is connected to the midpoint between the first battery group 11 and the second battery group 12. The controller 103 is configured to: respond to the first battery group 11 and the second battery group 1 2 are both less than or equal to the first threshold value, controlling the charging device 102 to charge the battery 100; in response to the voltage of at least one of the first battery group 11 and the second battery group 12 being greater than the first threshold value, executing the first battery group 11 to discharge to the first energy storage circuit 1012 and the first energy storage circuit 1012 to discharge to the second battery group 12 through the first bridge arm, so as to perform a first treatment on the battery 100, and executing the second battery group 12 to discharge to the first energy storage circuit 1012 and the first energy storage circuit 1012 to discharge to the first battery group 11 through the first bridge arm, so as to perform a second treatment on the battery 100.

[0087] In other words, the above technical solution is that in the first process, the step of discharging the first battery group 11 to the first energy storage circuit 1012 and the step of discharging the first energy storage circuit 1012 to the second battery group 12 are repeated alternately N1 times. In the second process, the step of discharging the second battery group 12 to the first energy storage circuit 1012 and the step of discharging the first energy storage circuit 1012 to the first battery group 11 are repeated alternately N2 times.

[0088] The value of N1 and the value of N2 can be set according to the first threshold value and different types of batteries 100. After performing N1 times of the first battery pack 11 discharging to the first energy storage circuit 1012 and the first energy storage circuit 1012 discharging to the second battery pack 12, and performing N2 times of the second battery pack 12 discharging to the first energy storage circuit 1012 and the first energy storage circuit 1012 discharging to the first battery pack 11, the voltage values ​​of the first battery pack 11 and the second battery pack 12 can both be less than or equal to the first threshold value. The value of N1 and the value of N2 can be the same or different.

[0089] Compared to executing the operation of discharging the first battery group 11 to the first energy storage circuit 1012 and the first energy storage circuit 1012 to the second battery group 12, and executing the operation of discharging the second battery group 12 to the first energy storage circuit 1012 and the first energy storage circuit 1012 to the first battery group 11, the above technical solution can also reduce the rate of change of the current flowing through the first energy storage circuit 1012, thereby reducing the current frequency, reducing the current ripple, and improving the depolarization effect on the first battery group 11 and the second battery group 12.

[0090] Furthermore, if Figure 3 As shown, Figure 3 The figure shows a waveform diagram of the current passing through the first energy storage circuit 1012 when the first battery group 11 discharges to the first energy storage circuit 1012 and the first energy storage circuit 1012 discharges to the second battery group 12 N1 times during the mutual discharge between the first battery group 11 and the second battery group 12, and when the second battery group 12 discharges to the first energy storage circuit 1012 and the first energy storage circuit 1012 discharges to the first battery group 11 N2 times.

[0091] like Figure 3 As shown, during the first processing period, the current in the first energy storage circuit 1012 gradually increases from 0 to a positive first current I up When the first energy storage circuit 1012 discharges to the second battery pack 12, the flow direction of the current passing through the first energy storage circuit 1012 remains unchanged, and the first energy storage circuit 1012 releases energy, so the current in the first energy storage circuit 1012 gradually decreases from the positive first current to the positive second current I down .

[0092] Repeat the above process so that during the first processing period, the current in the first energy storage circuit 1012 is at the positive first current I up and the positive second current I down The current in the first energy storage circuit 1012 changes alternately until the first process is completed and the current in the first energy storage circuit 1012 becomes 0.

[0093] After the first process is finished, the current in the first energy storage circuit 1012 becomes 0. After the second process begins, the second battery pack 12 charges the first energy storage circuit 1012, so that the current in the first energy storage circuit 1012 gradually increases. Since during the second process, the second battery pack 12 charges the first energy storage circuit 1012, and the first energy storage circuit 1012 charges the first battery pack 11, compared with the first process, the current flowing through the first energy storage circuit 1012 is reversed, so the current is negative. The current in the first energy storage circuit 1012 is negative at the first current -I up and a negative second current -I downThe current in the first energy storage circuit 1012 changes alternately until the second process is completed and the current in the first energy storage circuit 1012 becomes 0.

[0094] Figure 4 The figure shows a waveform diagram of the current passing through the first energy storage circuit 1012 when only one operation of the first battery group 11 discharging to the first energy storage circuit 1012 and the first energy storage circuit 1012 discharging to the second battery group 12 is performed during the mutual discharge between the first battery group 11 and the second battery group 12, and when only one operation of the second battery group 12 discharging to the first energy storage circuit 1012 and the first energy storage circuit 1012 discharging to the first battery group 11 is performed.

[0095] like Figure 4 As shown, during the first processing period, the current in the first energy storage circuit 1012 gradually increases from 0 to a positive first current I up When the first energy storage circuit 1012 charges the second battery pack 12, the current in the first energy storage circuit 1012 changes from the positive first current I up Since the first battery pack 11 only performs the step of charging the first energy storage circuit 1012 once during the first processing period, the first energy storage circuit 1012 will continue to release energy until the current in the first energy storage circuit 1012 decreases to 0. Similarly, during the second processing period, the current in the first energy storage circuit 1012 is negative to the first current -I up and 0.

[0096] From the above, it is not difficult to find that Figure 4 In the case shown, during the first process and the second process, the current through the first energy storage circuit 1012 is at the positive first current I up and the negative first current -I up between. Figure 3 In the case shown, during the first process, the current through the first energy storage circuit 1012 is at a positive first current I up and the positive second current I down During the second process, the current passing through the first energy storage circuit 1012 is between the negative first current -I up and a negative second current -I down The rate of change of the current passing through the first energy storage circuit 1012 is much smaller than Figure 4 The change rate of the current passing through the first energy storage circuit 1012 in the case shown can greatly reduce the frequency of the current passing through the first energy storage circuit 1012.

[0097] In the above technical solution, the first energy storage circuit 1012 plays the role of temporarily storing energy. Through the first energy storage circuit 1012, the discharge speed of the first battery group 11 and the second battery group 12 can be controlled, so that the discharge amount of the first battery group 11 and the second battery group 12 each time is not too much, and the probability of the first battery group 11 and the second battery group 12 being out of power is reduced. At the same time, through the switch circuit 1011 and the first energy storage circuit 1012, it is possible to achieve a small amount of multiple discharge of the first battery group 11 to the second battery group 12, and to achieve multiple discharge of the second battery group 12 to the first battery group 11, so that the time for the first battery group 11 and the second battery group 12 to discharge each other is longer, and the depolarization effect of the first battery group 11 and the second battery group 12 is enhanced.

[0098] refer to Figure 5 According to some embodiments of the present application, the negative electrode of the first battery group 11 is connected to the negative electrode of the second battery group 12, and the switch circuit 1011 includes: a first bridge arm 20, a first end of the first bridge arm 20 is connected to the positive electrode of the first battery group 11, and a second end is connected to the negative electrode of the first battery group 11, and a second bridge arm 21, a first end of the second bridge arm 21 is connected to the positive electrode of the second battery group 12, and a second end is connected to the second end of the first bridge arm 20; the first end of the first energy storage circuit 1012 is connected to the middle end of the first bridge arm 20 point, and the second end is connected to the midpoint of the second bridge arm 21, and the controller 103 is configured to: in response to the voltage of the first battery group 11 and the second battery group 12 being less than or equal to the first threshold value, control the charging device 102 to charge the first battery group 11 and the second battery group 12; in response to the voltage of the first battery group 11 and / or the second battery group 12 during charging being greater than the first threshold value, control the first battery group 11 and the second battery group 12 to discharge each other through the first bridge arm 20, the second bridge arm 21 and the first energy storage circuit 1012.

[0099] The second end of the second bridge arm 21 is connected to the second end of the first bridge arm 20 , that is, connected to the negative electrodes of the first battery group 11 and the second battery group 12 .

[0100] The positive electrode of the first battery group 11 and the positive electrode of the second battery group 12 may not be connected, or the positive electrode of the first battery group 11 and the positive electrode of the second battery group 12 may be connected through a switching element, and the switching element is used to control the positive electrode of the first battery group 11 and the positive electrode of the second battery group 12 to be disconnected during the mutual discharge of the first battery group 11 and the second battery group 12, and connected during charging. In the first bridge arm 20 and the second bridge arm 21, the on-off of the circuits on both sides of the midpoint can be controlled separately, and the first energy storage circuit 1012 is connected between the midpoint of the first bridge arm 20 and the midpoint of the second bridge arm 21. In this way, during the mutual discharge between the first battery group 11 and the second battery group 12, since the positive pole of the first battery group 11 and the positive pole of the second battery group 12 are disconnected and the first ends of the first bridge arm 20 and the second bridge arm 21 are respectively connected, the second ends of the first bridge arm 20 and the second bridge arm 21 are both connected to the negative poles of the first battery group 11 and the second battery group 12. 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 battery group 11 and the second battery group 12 can respectively pass through the first bridge arm 20 and the second bridge arm 21 to form different discharge circuits with the first energy storage circuit 1012.

[0101] Exemplarily, the first bridge arm 20 and the second bridge arm 21 can be controlled so that the first battery group 11 and the first energy storage circuit 1012 form a loop, so that the first battery group 11 discharges to the first energy storage circuit 1012, and the first energy storage circuit 1012 stores energy. Through the first bridge arm 20 and the second bridge arm 21, the second battery group 12 and the first energy storage circuit 1012 form a loop, so that the first energy storage circuit 1012 releases energy to the second battery group 12. Similarly, by controlling the first bridge arm 20, the second battery group 12 and the first energy storage circuit 1012 form a loop, so that the second battery group 12 discharges to the first energy storage circuit 1012, and the first energy storage circuit 1012 stores energy, and the first battery group 11 and the first energy storage circuit 1012 form a loop, so that the first energy storage circuit 1012 releases energy to the first battery group 11.

[0102] In some embodiments, during the entire charging process of the battery, the controller may only perform a limited number of operations to control the first battery group 11 and the second battery group 12 to discharge from each other in response to the voltage of the first battery group 11 and / or the second battery group 12 being greater than the first threshold value during charging, so that the battery can be fully charged smoothly. Exemplarily, the controller may control the first battery group 11 and the second battery group 12 to discharge from each other only in response to the first detection during battery charging that the voltage of the first battery group 11 and / or the second battery group 12 is greater than the first threshold value.

[0103] In the above technical solution, the first battery group 11 and the second battery group 12 can form a loop with the first energy storage circuit 1012 through the first bridge arm 20 and the second bridge arm 21 respectively, and discharge each other to reduce the voltage of the first battery group 11 and the second battery group 12. When the voltage of the first battery group 11 and / or the second battery group 12 is less than or equal to the first threshold value, the charging device 102 can be controlled to charge the battery 100 with a large current.

[0104] refer to Figures 6 to 9 According to some embodiments of the present application, the first bridge arm 20 includes: a first upper bridge arm and a first lower bridge arm, the first upper bridge arm is connected to the positive electrode of the first battery group 11, and the first lower bridge arm is connected to the negative electrode of the first battery group 11, the second bridge arm 21 includes: a second upper bridge arm and a second lower bridge arm, the second upper bridge arm is connected to the positive electrode of the second battery group 12, and the second lower bridge arm is connected to the negative electrode of the second battery group 12, and the controller 103 is configured to: alternately perform the first operation and the second operation so that the first battery group 11 discharges to the second battery group 12.

[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 controller 103 is further configured to alternately perform the third operation and the fourth operation so that the second battery pack 12 discharges into the first battery pack 11 .

[0108] 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.

[0109] 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.

[0110] The first upper bridge arm includes a first upper bridge arm switch tube V1, and the first lower bridge arm includes a first lower bridge arm switch tube V2. The first upper bridge arm can be turned on / off by turning on / off the first upper bridge arm switch tube V1, and the first lower bridge arm can be turned on / off by turning on / off the first lower bridge arm switch tube V2. The types of the first upper bridge arm switch tube V1 and the first lower bridge arm switch tube V2 include but are not limited to MOS tubes (Metal-Oxide-Semiconductor Field-Effect Transistor) or IGBT tubes (Insulate-Gate Bipolar Transistor, insulated gate bipolar transistors), etc.

[0111] The second upper bridge arm includes a second upper bridge arm switch tube V3, and the second lower bridge arm includes a second lower bridge arm switch tube V4. The second upper bridge arm can be turned on / off by turning on / off the second upper bridge arm switch tube V3, and the second lower bridge arm can be turned on / off by turning on / off the second lower bridge arm switch tube V4. Types of the second upper bridge arm switch tube V3 and the second lower bridge arm switch tube V4 include but are not limited to MOS tubes or IGBT tubes.

[0112] The controller 103 is configured to first perform a first operation so that the first battery group 11, the first upper bridge arm, the first energy storage circuit 1012 and the second lower bridge arm form a loop, and the current flows from the positive electrode of the first battery group 11 through the first upper bridge arm, the first energy storage circuit 1012 and the second lower bridge arm, and then flows back to the negative electrode of the first battery group 11, and the first battery group 11 discharges to the first energy storage circuit 1012; then perform a second operation so that the first battery group 11, the first upper bridge arm, the first energy storage circuit 1012, the second upper bridge arm and the second battery group 12 form a loop, and the current flows from the first energy storage circuit 1012 through the positive electrode of the second battery group 12, the negative electrode of the second battery group 12, the first battery group 11, the first upper bridge arm, and then flows back to the first energy storage circuit 1012, and the first energy storage circuit 1012 discharges to the second battery group 12.

[0113] In some embodiments, the first energy storage circuit 1012 is an inductor, such as Figure 6 The solid line with arrows in the middle shows the current path of the first battery pack 11 discharging to the inductor. Figure 7 The solid line with an arrow in it shows the current path for discharging the inductor to the second battery pack 12 .

[0114] During the second operation, the first end of the first energy storage circuit 1012 is connected to the first battery group 11 through the first upper bridge arm, and the second end of the first energy storage circuit 1012 is connected to the second battery group 12 through the second upper bridge arm, so that the voltage of the first battery group 11 and the first energy storage circuit 1012 connected in series is greater than the voltage of the second battery group 12, so that the first energy storage circuit 1012 can discharge to the second battery group 12. In addition, when the first energy storage circuit 1012 is charging the second battery group 12, the first battery group 11 can also continue to discharge to the first energy storage circuit 1012, so as to enhance the depolarization effect of the first battery group 11.

[0115] The controller 103 is configured to first perform a third operation so that the second battery group 12, the second upper bridge arm, the first energy storage circuit 1012 and the first lower bridge arm form a loop, and after the current flows out from the positive electrode of the second battery group 12, it flows through the second upper bridge arm, the first energy storage circuit 1012, the first lower bridge arm, and finally flows back to the negative electrode of the second battery group 12, and the second battery group 12 discharges to the first energy storage circuit 1012; then perform a fourth operation so that the first battery group 11, the first upper bridge arm, the first energy storage circuit 1012, the second upper bridge arm and the second battery group 12 form a loop, and after the current flows out from the first energy storage circuit 1012, it flows through the first upper bridge arm, the positive and negative electrodes of the first battery group 11, the second battery group 12, and finally flows back to the first energy storage circuit 1012, and the first energy storage circuit 1012 discharges to the first battery group 11.

[0116] In some embodiments, the first energy storage circuit 1012 is an inductor, such as Figure 8 The solid line with arrows in the middle shows the current path of the second battery pack 12 discharging to the inductor. Fig. 9 The solid line with an arrow in the middle shows the current path for discharging the inductor to the first battery group 11 .

[0117] During the execution of the fourth operation, the first end of the first energy storage circuit 1012 is connected to the first battery group 11 through the first upper bridge arm, and the second end of the first energy storage circuit 1012 is connected to the second battery group 12 through the second upper bridge arm, so that the voltage of the second battery group 12 and the first energy storage circuit 1012 connected in series is greater than the voltage of the first battery group 11, so that the first energy storage circuit 1012 can discharge to the first battery group 11. In addition, in the process of the first energy storage circuit 1012 charging the first battery group 11, the second battery group 12 can also continue to discharge to the first energy storage circuit 1012, so as to enhance the depolarization effect of the second battery group 12.

[0118] In some embodiments, the first upper bridge arm switch tube V1 is correspondingly provided with a first freewheeling diode D1, and the first lower bridge arm switch tube V2 is correspondingly provided with a second freewheeling diode D2. In the gap between the first operation switching to the second operation and the gap between the second operation switching to the first operation, the current can be freewheeling from the first freewheeling diode D1. Similarly, in the gap between the third operation switching to the fourth operation, the current can be freewheeling from the second freewheeling diode D2, and in the gap between the fourth operation switching to the third operation, the current can be freewheeling from the first freewheeling diode D1, so that during the mutual discharge between the first battery pack and the second battery pack, there is always current passing through the inductor, so that the rate of change of the current passing through the inductor is small, and the frequency of the current flowing through the inductor is kept low. In the case where the number of inductors is multiple, and the multiple inductors are three-phase windings in the motor, the problem of high-frequency howling of the motor caused by excessive current flowing through the motor can be greatly improved, and the performance of the motor can be kept relatively stable to enhance the depolarization effect on the battery 100.

[0119] The controller 103 can alternately perform the first operation and the second operation, or alternately perform the third operation and the fourth operation in response to the voltage of the first battery group 11 and the second battery group 12 being greater than the first threshold during charging, or can alternately perform the first processing and the second processing on the battery 100, in which the first operation and the second operation are alternately performed N1 times in the first processing, and the third operation and the fourth operation are alternately performed N2 times in the second processing.

[0120] During the process of the first energy storage circuit discharging to the second battery group 12, the first energy storage circuit, the first battery group 11 and the second battery group 12 can form a loop, and the first battery group 11 can continuously discharge to the first energy storage circuit, further improving the depolarization effect on the first battery group 11. In addition, it is also possible to make the voltage after the first battery group 11 and the first energy storage circuit are connected in series greater than the voltage of the second battery group 12, thereby improving the success rate of the first energy storage circuit discharging smoothly to the second battery group 12. Similarly, during the process of the first energy storage circuit discharging to the first battery group 11, the first energy storage circuit, the first battery group 11 and the second battery group 12 can form a loop, and the second battery group 12 can continuously discharge to the first energy storage circuit, thereby improving the success rate of the first energy storage circuit discharging smoothly to the first battery group 11, while improving the depolarization effect on the second battery group 12.

[0121] Continue to refer Figures 6 to 9According to some embodiments of the present application, the battery control circuit also includes: a first switch K1, connecting the positive electrode of the first battery group 11 and the positive electrode of the second battery group 12; the controller 103 is configured to: in response to the voltage of the first battery group 11 and the second battery group 12 being less than or equal to the first threshold, control the first switch K1 to close, and control the charging device 102 to charge the first battery group 11 and the second battery group 12; in response to the voltage of the first battery group 11 and the second battery group 12 being greater than the first threshold during charging, control the first switch K1 to open, so that the charging device 102 charges the first battery group 11 or the second battery group 12, and control the first battery group 11 and the second battery group 12 to discharge each other through the first bridge arm 20, the second bridge arm 21 and the first energy storage circuit 1012.

[0122] It can be understood that, since the negative electrode of the first battery group 11 is connected to the negative electrode of the second battery group 12, when the first switch K1 is closed, the positive electrode of the first battery group 11 is connected to the positive electrode of the second battery group 12, and the first battery group 11 and the second battery group 12 are connected in parallel. In some embodiments, the first battery group 11 and the second battery group 12 can be charged through either the first output terminal or the second output terminal.

[0123] For example, the first output terminal of the charging device 102 may include a first positive terminal, the second output terminal may include a second positive terminal, the charging device 102 further includes a negative terminal, and the first output terminal and the second output terminal may share the same negative terminal. When the first switch K1 is closed, either the first output terminal or the second output terminal may be connected to the battery 100, and the other may be disconnected from the battery 100.

[0124] In some embodiments, the charging device 102 may further include a first positive charging relay K11, a second positive charging relay K21, and a negative charging relay K12. The first positive charging relay K11 is connected to the first positive terminal and the positive electrode of the first battery pack 11, the second positive charging relay K21 is connected to the second positive terminal and the positive electrode of the second battery pack 12, and the negative charging relay K12 is connected to the negative terminal and the negative electrodes of the first battery pack 11 and the second battery pack 12.

[0125] The controller 103 is configured to: in response to the voltage of the first battery group 11 and the second battery group 12 being greater than the first threshold during charging, control the first switch K1 to be disconnected, and send a message to the charging device 102 to make the first battery group 11 and the second battery group 12 discharge each other. After receiving the message to make the first battery group 11 and the second battery group 12 discharge each other, the charging device 102 controls one of the first charging positive relay K11 and the second charging positive relay K21 to be closed and the other to be disconnected, so as to charge either the first battery group 11 or the second battery group 12. As an example, Figures 6 to 9The figure shows the situation in which the first charging positive relay K11 and the charging negative relay K12 are closed, and the second charging positive relay K21 is disconnected, so as to charge the first battery group 11 during the discharge of the first battery group 11 to the second battery group 12 and during the discharge of the second battery group 12 to the first battery group 11. The dotted line with an arrow is a schematic diagram of the current path for the charging device 102 to charge the first battery group 11.

[0126] In some embodiments, the first switch K1 may include but is not limited to a relay or other element capable of functioning as a switch.

[0127] In some embodiments, the battery control circuit further includes a second switch K2 and a third switch K3, wherein the first end of the second switch K2 is connected to the positive electrode of the first battery group 11, and the second end of the second switch K2 is connected to the first upper bridge arm, for controlling the connection / disconnection between the positive electrode of the first battery group 11 and the first upper bridge arm. The first end of the third switch K3 is connected to the negative electrode of the first battery group 11, and the second end of the third switch K3 is connected to the first lower bridge arm, for controlling the connection / disconnection between the negative electrode of the first battery group 11 and the first lower bridge arm. In this way, when the first battery group 11 and the second battery group 12 need to discharge each other, the connection between the first battery group 11 and the first bridge arm 20 can be controlled by the second switch K2 and the third switch K3, and when the battery 100 does not need the first battery group 11 and the second battery group 12 to discharge each other, the first battery group 11 can be disconnected from the first bridge arm 20 by the second switch K2 and / or the third switch K3, so as not to affect the normal performance of the battery 100.

[0128] In some embodiments, the second switch K2 can be connected to the first upper bridge arm through the first connector 24, and the third switch K3 can be connected to the first lower bridge arm through the second connector 25. When the negative electrode of the first battery pack 11 and the negative electrode of the second battery pack 12 are connected, the second connector 25 is connected to the negative electrode of the first battery pack 11 and the second battery pack 12 through the third switch. In one example, the negative charging relay K12 of the charging device 102 can be connected to the second connector 25, so that the negative electrodes of the first battery pack 11 and the second battery pack 12 are both connected to the same negative terminal of the charging device 102 through the negative charging relay K12.

[0129] In some embodiments, the battery control circuit further includes a fourth switch K4 and a first resistor connected in parallel with the third switch K3. The third switch K3 and the first resistor are connected in series to play a role of current limiting protection.

[0130] In some embodiments, the battery control circuit also includes a current sensor 23, which is connected between the first battery group 11 and the first bridge arm 20. Exemplarily, it can be connected between the positive electrode of the battery 100 and the second switch K2, and is used to detect the current output by the battery 100, so as to facilitate the regulation of the current in the battery control circuit during the mutual discharge between the first battery group and the second battery group, so as to produce a better depolarization effect on the battery 100.

[0131] In some embodiments, the second switch K2 , the third switch K3 , and the fourth switch K4 may include, but are not limited to, relays.

[0132] In the above technical solution, during charging, the first switch K1 is closed, so that the first battery group 11 and the second battery group 12 are connected in parallel, and then the first battery group 11 and the second battery group 12 can be charged simultaneously through any one of the first output terminal and the second output terminal, and the voltages of the first battery group 11 and the second battery group 12 are consistent, which is conducive to maintaining the energy balance of the first battery group 11 and the second battery group 12 during charging, and maintaining the stable performance of the battery 100. When it is detected that the voltage of any one of the first battery group 11 and the second battery group 12 is greater than the first threshold, the first switch K1 is disconnected, that is, the first battery group and the second battery group are not in parallel, so that the first battery group and the second battery group can form a charging and discharging circuit respectively through the first bridge arm 20 and the second bridge arm 21, thereby realizing the depolarization of the battery 100. That is, by turning on and off the first switch K1, the charging state and the depolarization state of the battery 100 can be switched.

[0133] refer to Fig.10 According to some embodiments of the present application, a second energy storage circuit 1013 is also connected in parallel at both ends of the first battery group 11, and the controller 103 is further configured to: during the mutual discharge between the first battery group 11 and the second battery group 12, perform N3 operations of the first battery group 11 discharging to the second energy storage circuit 1013 and the second energy storage circuit discharging to the second battery group 12 through the switch circuit 1011, where N3 is an integer greater than or equal to 1; and / or during the mutual discharge between the first battery group 11 and the second battery group 12, perform N4 operations of the first battery group 11 discharging to the second energy storage circuit 1013 and the second energy storage circuit 1013 discharging to the first battery group 11 through the switch circuit 1011, where N4 is an integer greater than or equal to 1.

[0134] Since the two ends of the first bridge arm 20 are respectively connected to the two ends of the first battery group 11, the two ends of the second energy storage circuit 1013 are also 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 1012, so that the second energy storage circuit 1013 can be connected to the second battery group 12 through the first bridge arm 20, the first energy storage circuit 1012 and the second bridge arm 21, thereby being able to execute the first battery group 11 discharging to the second energy storage circuit 1013 and the second energy storage circuit 1013 discharging to the second battery group 12, and / or the first battery group 11 discharging to the second energy storage circuit 1013 and the second energy storage circuit 1013 discharging to the first battery group 11.

[0135] The value of N3 and the value of N4 can be set according to the first threshold value and different types of batteries 100. After performing N3 operations of discharging the first battery pack 11 to the first energy storage circuit 1012 and the first energy storage circuit 1012 to the second battery pack 12, and / or performing N4 operations of discharging the first battery pack 11 to the first energy storage circuit 1012 and the first energy storage circuit 1012 to the first battery pack 11, the voltage values ​​of the first battery pack 11 and the second battery pack 12 can both be less than or equal to the first threshold value. The value of N3 and the value of N4 can be the same or different.

[0136] In some embodiments, the second energy storage circuit 1013 may include but is not limited to elements with charging and discharging functions such as inductors or capacitors.

[0137] In the above technical solution, the second energy storage circuit 1013 can also realize the discharge of the first battery group 11 to the second battery group 12, and / or the discharge of the second battery group 12 to the first battery group 11, thereby improving the depolarization effect on the battery.

[0138] According to some embodiments of the present application, the controller 103 is also configured to: during the discharge of the first battery group 11 to the second battery group 12, simultaneously execute the discharge of the first battery group 11 to the first energy storage circuit 1012 and the discharge of the first battery group 11 to the second energy storage circuit 1013 through the switching circuit 1011, and simultaneously execute the discharge of the first energy storage circuit 1012 to the second battery group 12 and the discharge of the second energy storage circuit 1013 to the second battery group 12; during the discharge of the second battery group 12 to the first battery group 11, simultaneously execute the discharge of the second battery group 12 to the first energy storage circuit 1012 and the discharge of the first battery group 11 to the second energy storage circuit 1013 through the switching circuit 1011, and simultaneously execute the discharge of the first energy storage circuit 1012 to the first battery group 11 and the discharge of the second energy storage circuit 1013 to the first battery group 11.

[0139] The second energy storage circuit 1013 is connected in parallel to the first battery pack 11 , so that the first battery pack 11 can release energy to the second energy storage circuit 1013 , and the second energy storage circuit 1013 can release energy to the first battery pack 11 .

[0140] Exemplarily, during the execution of the first operation so that the first battery group 11, the first upper bridge arm, the first energy storage circuit 1012 and the second lower bridge arm form a loop, the second energy storage circuit 1013 can form a loop with the first battery group 11, the first upper bridge arm, the first energy storage circuit 1012 and the second lower bridge arm, so that the first battery group 11 discharges to the first energy storage circuit 1012 and the second energy storage circuit 1013 at the same time, that is, the second energy storage circuit 1013 stores energy.

[0141] During the execution of the second operation so that the first battery group 11, the first upper bridge arm, the first energy storage circuit 1012, the second upper bridge arm and the second battery group 12 form a loop, the second energy storage circuit 1013 can form a loop with the second battery group 12, the first upper bridge arm, the first energy storage circuit 1012 and the second upper bridge arm, and the second energy storage circuit 1013 releases energy to the second battery group 12.

[0142] That is, during the execution of the first operation and the second operation, the first battery pack 11 can discharge to the second battery pack 12 through the first energy storage circuit 1012 and the second energy storage circuit 1013 at the same time.

[0143] During the execution of the third operation, the second battery group 12, the second upper bridge arm, the first energy storage circuit 1012 and the first lower bridge arm form a loop so that the second battery group 12 discharges to the first energy storage circuit 1012, and the second energy storage circuit 1013 can form a loop with the first battery group 11 so that the first battery group 11 discharges to the second energy storage circuit 1013, and the second energy storage circuit 1013 stores energy.

[0144] During the execution of the fourth operation, the first battery group 11, the first upper bridge arm, the first energy storage circuit 1012, the second upper bridge arm and the second battery group 12 form a loop, so that the first energy storage circuit 1012 discharges to the first battery group 11, and the second energy storage circuit 1013 can form a loop with the first battery group 11, and the second energy storage circuit 1013 releases energy to the first battery group 11.

[0145] That is, during the execution of the third operation and the fourth operation, the second battery group 12 can discharge to the first battery group 11 through the first energy storage circuit 1012 , and the first battery group 11 can exchange energy with the second energy storage circuit 1013 .

[0146] In the above technical solution, the first battery group 11 can exchange energy with the second energy storage circuit 1013, which can increase the discharge amount of the first battery group 11 in a short time and improve the discharge efficiency of the first battery group 11, thereby further improving the depolarization effect.

[0147] like Fig.10 As shown, according to some embodiments of the present application, the first energy storage circuit 1012 includes at least one inductor, and the second energy storage circuit 1013 includes a capacitor C. The inductor can store a large amount of electricity, which can improve the energy transfer efficiency between the first battery group and the second battery group, so that the battery 100 has a better depolarization effect.

[0148] In some embodiments, the first energy tank circuit 1012 may include an inductor.

[0149] In other embodiments, the first energy storage circuit 1012 may also include multiple inductors, which may be connected in parallel or in series, or some of the multiple inductors may be connected in series with the remaining inductors. There may be multiple first bridge arms 20, and the number of first bridge arms 20 is the same as the number of parallel inductors, and the parallel inductors are connected to the multiple first bridge arms 20 in a one-to-one correspondence.

[0150] Exemplarily, the first energy storage circuit 1012 may include three first inductors L1, and the three first inductors L1 are connected in parallel. The number of the first bridge arms 20 is three, and the three first inductors L1 are connected to the three first bridge arms 20 in a one-to-one correspondence, wherein the first end of the first inductor L1 is connected to the midpoint of the first bridge arm 20, and the second end of the first inductor L1 is connected to the midpoint of the second bridge arm 21. The three first inductors L1 may be three-phase windings in the motor, and the bridge arm connected to the first inductor L1 may be a three-phase bridge arm. In this way, when charging the battery of the vehicle, the existing motor and three-phase bridge arm in the vehicle can be used to depolarize the battery, thereby reducing costs.

[0151] Both the capacitor and the inductor have the function of charging and discharging. The first energy storage circuit 1012 is set to include at least one inductor, and the second energy storage circuit 1013 includes a capacitor. It is possible to realize, through the switching circuit 1011, the discharge of the first battery group 11 to the inductor and the discharge of the first battery group 11 to the capacitor, the discharge of the inductor to the second battery group 12 and the discharge of the capacitor to the second battery group 12 at the same time, and through the switching circuit 1011, the discharge of the second battery group 12 to the inductor and the discharge of the first battery group 11 to the capacitor, and the discharge of the inductor to the first battery group 11 and the discharge of the capacitor to the first battery group 11 at the same time.

[0152] like Fig.11As shown, the capacitor is connected in parallel across the first battery group 11. During the period when the first battery group 11, the first upper bridge arm, the inductor and the second lower bridge arm form a loop, the capacitor can form a loop with the first battery group 11, the first upper bridge arm, the inductor and the second lower bridge arm, so that the first battery group 11 discharges to the capacitor and the inductor at the same time, that is, the capacitor and the inductor store energy.

[0153] While the first battery group 11 , the first upper bridge arm, the inductor, the second upper bridge arm and the second battery group 12 form a loop, the capacitor can form a loop with the second battery group 12 , the first upper bridge arm, the inductor and the second upper bridge arm, and the inductor and the capacitor release energy to the second battery group 12 .

[0154] The second battery group 12, the second upper bridge arm, the inductor and the first lower bridge arm form a loop, so that when the second battery group 12 discharges to the inductor, the capacitor can form a loop with the first battery group 11, so that the first battery group 11 discharges to the capacitor, and the capacitor stores energy.

[0155] The first battery pack 11 , the first upper bridge arm, the inductor, the second upper bridge arm and the second battery pack 12 form a loop so that the inductor discharges to the first battery pack 11 , and the capacitor acts as a substitute power source to release energy to the first battery pack 11 .

[0156] In the above technical solution, the capacitor has a small volume and can realize fast charge and discharge, which further improves the depolarization effect on the battery 100 while keeping the volume of the battery control circuit small, reducing the weight of the battery control circuit and reducing the cost.

[0157] An embodiment of the present application provides a battery system, which includes the battery control circuit in the above embodiment.

[0158] An embodiment of the present application provides an electrical device, which includes the battery system in the above embodiment, and the battery system is used to provide electrical energy.

[0159] The battery system includes a battery 100, and the battery 100 is connected to a battery control circuit. The battery system has the beneficial effects of the battery control circuit provided in the embodiment of the present application, and the specific description of the battery control circuit in the above embodiments can be referred to, which will not be repeated here.

[0160] The electrical device may refer to the relevant description in the above embodiments, which will not be described in detail below.

[0161] Combined with reference Figure 1 as well as Fig.12 The embodiment of the present application provides a battery charging control method, wherein the battery 100 includes a first battery pack 11 and a second battery pack 12, wherein the first battery pack 11 and the second battery pack 12 are respectively connected to an external charging device 102, and the battery 100 is also connected to a first module 101, and the method includes: Step 110, obtaining the voltages of the first battery pack 11 and the second battery pack 12 during the period when the charging device 102 is charging the battery 100; Step 120, in response to the voltage of the first battery group 11 and / or the second battery group 12 being greater than the first threshold, controlling the first module to allow the first battery group and the second battery group to discharge each other; wherein, during the period when the first battery group 11 and the second battery group 12 discharge each other, controlling the charging device 102 to charge at least one of the first battery group 11 and the second battery group 12.

[0162] The structures of the battery 100 , the first module 101 and the charging device 102 may refer to the related descriptions in the above embodiments, which will not be described in detail below.

[0163] In step 110, the method of obtaining the voltages of the first battery group 11 and the second battery group 12 during charging can refer to the relevant description in the above embodiment, which will not be repeated below.

[0164] Step 120 may be executed by the controller 103 in the above embodiment. The method for setting the first threshold and the method related to step 120 may refer to the relevant description in the above embodiment, which will not be described in detail below.

[0165] In the above technical solution, during the discharge process, the charges accumulated on the electrodes of the first battery group 11 and the second battery group 12 can be quickly reduced, the polarization voltage can be reduced, and the polarization phenomenon can be improved, so that the first battery group 11 and / or the second battery group 12 after depolarization can be charged with a large current. At the same time, during the mutual discharge between the first battery group 11 and the second battery group 12, the charging device 102 maintains charging of at least one of the first battery group 11 and / or the second battery group 12, so that the connection between the charging device 102 and the battery 100 can be maintained. After the mutual discharge between the first battery group 11 and the second battery group 12 is completed, the charging device 102 can directly recharge the battery 100 without executing the process of re-interacting the charging device 102 with the battery 100, further shortening the charging time and improving the charging efficiency.

[0166] According to some embodiments of the present application, in step 120, the charging current of the charging device 102 for the first battery group 11 or the second battery group 12 is controlled to be smaller than the discharge current of the first battery group 11 to the second battery group 12, and smaller than the discharge current of the second battery group 12 to the first battery group 11.

[0167] In some embodiments, in step 120, the charging device 102 charges the first battery group 11. During the period when the first battery group 11 discharges to the second battery group 12, the charging current of the charging device 102 for the first battery group 11 is less than the discharging current of the first battery group 11 to the second battery group 12. During the period when the second battery group 12 discharges to the first battery group 11, the charging current of the charging device 102 for the first battery group 11 is less than the discharging current of the second battery group 12 to the first battery group 11.

[0168] In other embodiments, in step 120, the charging device 102 charges the second battery group 12, and the first battery group 11 discharges to the second battery group 12, and the charging current of the charging device 102 to the second battery group 12 is less than the discharging current of the first battery group 11 to the second battery group 12, and during the discharging of the second battery group 12 to the first battery group 11, the charging current of the charging device 102 to the second battery group 12 is less than the discharging current of the second battery group 12 to the first battery group 11.

[0169] In some other embodiments, when the first battery group 11 discharges to the second battery group 12 and the charging device 102 charges the first battery group 11, the charging current of the charging device 102 to the first battery group 11 is less than the discharging current of the first battery group 11 to the second battery group 12. When the second battery group 12 discharges to the first battery group 11 and the charging device 102 charges the second battery group 12, the charging current of the charging device 102 to the second battery group 12 is less than the discharging current of the second battery group 12 to the first battery group 11.

[0170] It is understandable that the greater the charging current of the battery 100, the faster the charge accumulation speed on the electrode of the battery 100, and the greater the discharging current of the battery 100, the faster the charge release speed on the electrode of the battery 100. When the current magnitude is the same, the charge release speed of the battery 100 when discharging is greater than the charge accumulation speed when charging the battery 100. The charging current of the charging device 102 for the first battery group 11 or the second battery group 12 is set to be less than the discharge current of the first battery group 11, so that during the mutual discharge between the first battery group 11 and the second battery group 12, the charge accumulation speed of the first battery group 11 or the second battery group 12 is further reduced compared to the charge release speed.

[0171] In the above technical solution, the charging current of the charging device 102 for the first battery group 11 or the second battery group 12 is set to be smaller than the discharging current of the first battery group 11, which can ensure to a certain extent that the amount of charge accumulated on the electrodes of the first battery group 11 or the second battery group 12 when the charging device 102 charges the first battery group 11 or the second battery group 12 is smaller than the amount of charge released by the first battery group 11 and the second battery group 12 during the discharge process, thereby making the first battery group 11 and the second battery group 12 have a better depolarization effect, thereby improving the depolarization phenomenon of the battery 100.

[0172] It is understandable that, since the rate at which the battery 100 releases charges when discharging is greater than the rate at which the battery 100 accumulates charges when charging when the current is the same, in other embodiments, in step 120, the charging current of the charging device 102 for the first battery group 11 or the second battery group 12 may be controlled to be greater than or equal to the discharge current from the first battery group 11 to the second battery group 12, and / or greater than or equal to the discharge current from the second battery group 12 to the first battery group 11.

[0173] According to some embodiments of the present application, during the period when the first battery group 11 and the second battery group 12 discharge each other, controlling the charging device 102 to charge at least one of the first battery group 11 and the second battery group 12 includes: during the period when the first battery group 11 and the second battery group 12 discharge each other, controlling the charging device 102 to charge one of the first battery group 11 or the second battery group 12.

[0174] The method of controlling the charging device 102 to charge one of the first battery pack 11 or the second battery pack 12 may refer to the relevant description in the above embodiment, which will not be described in detail below.

[0175] In the above technical solution, the first battery group 11 or the second battery group 12 that is not charged by the charging device 102 during the mutual discharge between the first battery group 11 and the second battery group 12 will not accumulate charge due to being charged, which ensures that it has a good depolarization effect to a certain extent, thereby being able to better improve the depolarization effect of the battery 100 while maintaining the connection between the charging device 102 and the battery 100.

[0176] According to some embodiments of the present application, step 120 includes performing a first process on the battery, and the first process includes: executing discharge of the first battery group 11 to the second battery group 12 through the first module 101 .

[0177] During the mutual discharge between the first battery group 11 and the second battery group 12 , controlling the charging device 102 to charge at least one of the first battery group 11 and the second battery group 12 includes: in a first process, controlling the charging device 102 to charge the first battery group 11 .

[0178] In the first process, the method of controlling the charging device 102 to charge the first battery pack 11 may refer to the relevant description in the above embodiment, which will not be repeated below.

[0179] In the above technical solution, the problem of the first battery pack being depleted due to excessively fast discharge speed can be avoided to a certain extent, which is beneficial to maintaining the normal performance of the first battery pack to improve the charging efficiency.

[0180] According to some embodiments of the present application, step 120 includes performing a second process on the battery, and the second process includes: executing, through the first module 101 , discharging the second battery group 12 into the first battery group 11 .

[0181] During the mutual discharge between the first battery group 11 and the second battery group 12 , controlling the charging device 102 to charge at least one of the first battery group 11 and the second battery group 12 includes: in a second process, controlling the charging device 102 to charge the second battery group 12 .

[0182] In the second process, the method of controlling the charging device 102 to charge the second battery pack 12 may refer to the relevant description in the above embodiment, which will not be described in detail below.

[0183] In the above technical solution, the problem of the second battery pack 12 being depleted due to excessively fast discharge speed can be avoided to a certain extent, which is beneficial to maintaining the normal performance of the second battery pack 12 to improve the charging efficiency.

[0184] refer to Figure 2 According to some embodiments of the present application, the negative electrode of the first battery group 11 is connected to the negative electrode of the second battery group 12, and the first module 101 includes: a switching circuit 1011 and a first energy storage circuit 1012, the switching circuit 1011 is connected to the battery 100, and the first energy storage circuit 1012 is connected to the switching circuit 1011.

[0185] Controlling the first module 101 to make the first battery group 11 and the second battery group 12 discharge each other includes: performing N1 operations of discharging the first battery group 11 to the first energy storage circuit 1012 and discharging the first energy storage circuit 1012 to the second battery group 12 through the switch circuit 1011, so that the first battery group 11 discharges to the second battery group 12, and N1 is an integer greater than or equal to 1.

[0186] Controlling the first module 101 so that the first battery group 11 and the second battery group 12 discharge each other also includes: through the switch circuit 1011, performing N2 operations of the second battery group 12 discharging to the first energy storage circuit 1012 and the first energy storage circuit 1012 discharging to the first battery group 11, so that the second battery group 12 discharges to the first battery group 11, N2 is an integer greater than or equal to 1.

[0187] For the connection method of the first battery pack 11 and the second battery pack 12, as well as the structure and connection method of the switch circuit 1011 and the first energy storage circuit 1012 with the first battery pack 11 and the second battery pack 12, reference may be made to the relevant description in the above embodiments, which will not be repeated below.

[0188] The specific method and principle of the first battery pack 11 discharging to the second battery pack 12 and the second battery pack 12 discharging to the first battery pack 11 in the above technical solution can be referred to the relevant description in the above embodiments, which will not be repeated below.

[0189] In the above technical solution, the first energy storage circuit 1012 plays the role of temporarily storing energy. Through the first energy storage circuit 1012, the discharge speed of the first battery group 11 and the second battery group 12 can be controlled, so that the discharge amount of the first battery group 11 and the second battery group 12 each time is not too much, and the probability of the first battery group 11 and the second battery group 12 being out of power is reduced. At the same time, through the switch circuit 1011 and the first energy storage circuit 1012, it is possible to achieve multiple discharges from the first battery group 11 to the second battery group 12, and multiple discharges from the second battery group 12 to the first battery group 11, so that the time for the first battery group 11 and the second battery group 12 to discharge each other is longer, and the depolarization effect of the first battery group 11 and the second battery group 12 is enhanced.

[0190] Combined with reference Figure 5 as well as Fig.13 According to some embodiments of the present application, the switch circuit 1011 includes: a first bridge arm 20 and a second bridge arm 21, the first end of the first bridge arm 20 is connected to the positive electrode of the first battery group 11, and the second end is connected to the negative electrode of the first battery group 11, the first end of the second bridge arm 21 is connected to the positive electrode of the second battery group 12, and the second end is connected to the second end of the first bridge arm 20; the first end of the first energy storage circuit 1012 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. The method also includes: Step 130 , in response to the voltage of the first battery group 11 and the second battery group 12 being less than or equal to the first threshold, controlling the charging device 102 to charge the first battery group 11 and the second battery group 12 .

[0191] Step 120 includes: in response to the voltage of the first battery group 11 and / or the second battery group 12 being greater than a first threshold during charging, controlling the first battery group 11 and the second battery group 12 to discharge each other through the first bridge arm 20, the second bridge arm 21 and the first energy storage circuit 1012; wherein, during the period of mutual discharge between the first battery group 11 and the second battery group 12, controlling the charging device 102 to charge at least one of the first battery group 11 and the second battery group 12.

[0192] For the structures of the first bridge arm 20 and the second bridge arm 21 and the connection between the first battery group 11 and the second battery group 12 , reference may be made to the relevant description in the above embodiments, which will not be described in detail below.

[0193] For the specific method of executing step 120 and step 130 by the first bridge arm 20, the second bridge arm 21 and the first energy storage circuit 1012, reference may be made to the relevant description in the above embodiment, which will not be repeated below.

[0194] It is worth noting that step 130 can be performed before step 120. During the execution of step 130, the voltage of the first battery group 11 and the second battery group 12 is obtained, and in response to the voltage of the first battery group 11 and the second battery group 12 being greater than the first threshold, step 120 is performed. After step 120 is completed, if the voltage of the first battery group 11 and the second battery group 12 are both less than or equal to the first threshold, step 130 is performed again, and the battery 100 enters the charging state again, and a large current can be used to charge the battery 100. During the entire charging process of the battery, only a limited number of operations of controlling the mutual discharge of the first battery group 11 and the second battery group 12 in response to the voltage of the first battery group 11 and / or the second battery group 12 being greater than the first threshold during charging can be performed, so that the battery can be fully charged smoothly.

[0195] Exemplarily, the controller may control the first battery pack 11 and the second battery pack 12 to discharge each other only in response to detecting for the first time during battery charging that the voltage of the first battery pack 11 and / or the second battery pack 12 is greater than the first threshold.

[0196] It is worth noting that in step 120, the step of discharging the first battery group 11 to the second battery group 12 and the step of discharging the second battery group 12 to the first battery group 11 can be performed alternately. That is, the first process and the second process are performed alternately, and in the first process, the operation of discharging the first battery group to the first energy storage circuit and the operation of discharging the first energy storage circuit to the second battery group are performed N1 times. In the second process, the operation of discharging the second battery group to the first energy storage circuit and the operation of discharging the first energy storage circuit to the first battery group are performed N2 times. Among them, the number of alternations, as well as the values ​​of N1 and N2 can be set in advance according to different batteries 100 and the first threshold value, so that after the end of step 120, the voltage of the first battery group 11 and the second battery group 12 can be less than or equal to the first threshold value. When the controller 103 detects that the voltage of the first battery group 11 and the second battery group 12 is greater than the first threshold value, it causes the first battery group 11 and the second battery group 12 to discharge each other according to a pre-set rule.

[0197] In the above technical solution, through the first bridge arm 20 and the second bridge arm 21, the first energy storage circuit 1012 can form a loop with the first battery group 11 and the second battery group 12 respectively, so that the first battery group 11 and the second battery group 12 can discharge each other through the first energy storage circuit 1012 to reduce the voltage of the first battery group 11 and the second battery group 12. When the voltage of the first battery group 11 and / or the second battery group 12 is less than or equal to the first threshold value, the charging device 102 can be controlled to charge the battery 100 with a large current.

[0198] refer to Figures 6 to 9 According to some embodiments of the present application, the first bridge arm 20 includes: a first upper bridge arm and a first lower bridge arm, the first upper bridge arm is connected to the positive electrode of the first battery group 11, and the first lower bridge arm is connected to the negative electrode of the first battery group 11, and the second bridge arm 21 includes: a second upper bridge arm and a second lower bridge arm, the second upper bridge arm is connected to the positive electrode of the second battery group 12, and the second lower bridge arm is connected to the negative electrode of the second battery group 12.

[0199] The discharge of the first battery pack 11 into the second battery pack 12 includes alternately performing a first operation and a second operation.

[0200] Among them, 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.

[0201] The discharging of the second battery group 12 into the first battery group 11 includes alternately performing the third operation and the fourth operation.

[0202] Among them, 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.

[0203] For the structures of the first upper bridge arm, the first lower bridge arm, the second upper bridge arm and the second lower bridge arm and the connection method between the first battery group 11 and the second battery group 12, reference can be made to the relevant description in the above embodiments, which will not be repeated below.

[0204] For the specific methods and principles for performing the first operation and the second operation so that the first battery group 11 discharges to the second battery group 12, and the specific methods and principles for performing the third operation and the fourth operation so that the second battery group 12 discharges to the first battery group 11, please refer to the relevant descriptions in the above embodiments and will not be repeated below.

[0205] In the above technical solution, during the process of the first energy storage circuit 1012 discharging to the second battery group 12, the first energy storage circuit 1012, the first battery group 11 and the second battery group 12 can form a loop, and the first battery group 11 can continuously discharge to the first energy storage circuit 1012, further improving the depolarization effect on the first battery group 11. Similarly, during the process of the first energy storage circuit 1012 discharging to the first battery group 11, the first energy storage circuit 1012, the first battery group 11 and the second battery group 12 can form a loop, and the second battery group 12 can continuously discharge to the first energy storage circuit 1012, improving the depolarization effect on the second battery group 12.

[0206] According to some embodiments of the present application, the positive electrode of the first battery pack 11 and the positive electrode of the second battery pack 12 are connected via a first switch K1 .

[0207] Step 130 includes: in response to the voltage of the first battery pack 11 and the second battery pack 12 being less than or equal to the first threshold, controlling the first switch K1 to close, and controlling the charging device 102 to charge the first battery pack 11 and the second battery pack 12 .

[0208] Step 120 includes: in response to the voltage of the first battery group 11 and the second battery group 12 being greater than a first threshold during charging, controlling the first switch K1 to disconnect; controlling the charging device 102 to charge the first battery group 11 or the second battery group 12, and controlling the first battery group 11 and the second battery group 12 to discharge each other through the first bridge arm 20, the second bridge arm 21 and the first energy storage circuit 1012.

[0209] When the positive electrodes of the first battery pack 11 and the second battery pack 12 are connected via the first switch K1 , the method of executing step 130 and step 120 may refer to the relevant description in the above embodiment, which will not be described in detail below.

[0210] In the above technical solution, the charging state and the depolarization state of the battery 100 can be switched by turning on and off the first switch K1.

[0211] According to some embodiments of the present application, during the mutual discharge between the first battery group and the second battery group, when the charging device 102 is controlled to charge the first battery group 11, the discharge of the first battery group 11 to the second battery group 12 also includes: controlling the sum of the charging current of the charging device 102 to the first battery group 11 and the discharge current of the first battery group 11 to be equal to the discharge current of the first energy storage circuit 1012 to the second battery group 12; the discharge of the second battery group 12 to the first battery group 11 also includes: controlling the sum of the charging current of the charging device 102 to the first battery group 11 and the discharge current of the first energy storage circuit 1012 to the first battery group 11 to be equal to the discharge current of the second battery group 12.

[0212] Alternatively, during the mutual discharge between the first battery group 11 and the second battery group 12, when the charging device 102 is controlled to charge the second battery group 12, the discharge of the first battery group 11 to the second battery group 12 also includes: controlling the sum of the charging current of the charging device 102 to the second battery group 12 and the discharge current of the first energy storage circuit 1012 to the second battery group 12 to be equal to the discharge current of the first battery group 11; the discharge of the second battery group 12 to the first battery group 11 also includes: controlling the sum of the charging current of the charging device 102 to the second battery group 12 and the discharge current of the second battery group 12 to be equal to the sum of the discharge current of the first energy storage circuit 1012 to the first battery group 11.

[0213] In some embodiments, the switch circuit 1011 includes a first bridge arm 20 and a second bridge arm 21, the first bridge arm 20 includes a first upper bridge arm switch tube and a first lower bridge arm switch tube, and the second bridge arm 21 includes a second upper bridge arm switch tube and a second lower bridge arm switch tube. It can be understood that since the magnitude of the conduction current of the switch tube can be controlled by the magnitude of the voltage applied to the control end of the switch tube, therefore, during the mutual discharge between the first battery group 11 and the second battery group 12, the magnitude of the discharge current of the first battery group 11, the second battery group 12 and the first energy storage circuit 1012 can be controlled by controlling the magnitude of the conduction current flowing through the first upper bridge arm switch tube, the first lower bridge arm switch tube, the second upper bridge arm switch tube and the second lower bridge arm switch tube, so as to achieve the above purpose.

[0214] In the above technical solution, the voltages of the first battery group 11 and the second battery group 12 are as close as possible during the mutual discharge between the first battery group 11 and the second battery group 12, which is beneficial for maintaining the stability of the first battery group 11 and the second battery group 12 when the battery 100 continues to be charged after the mutual discharge between the first battery group 11 and the second battery group 12 is completed.

[0215] refer to Fig.10 as well as Fig.11 According to some embodiments of the present application, a second energy storage circuit 1013 is further connected in parallel at both ends of the first battery group 11, and the method further includes: during the period when the first battery group 11 and the second battery group 12 discharge each other, the first battery group 11 discharges to the second energy storage circuit 1013 and the second energy storage circuit 1013 discharges to the second battery group 12 for N3 times through the switch circuit 1011, where N3 is an integer greater than or equal to 1; and / or during the period when the first battery group 11 and the second battery group 12 discharge each other, the first battery group 11 discharges to the second energy storage circuit 1013 and the second energy storage circuit 1013 discharges to the first battery group 11 for N4 times through the switch circuit 1011, where N4 is an integer greater than or equal to 1.

[0216] Regarding the structure of the second energy storage circuit 1013 and the method of executing N3 times of discharge of the first battery group 11 to the second energy storage circuit 1013 and the second energy storage circuit 1013 to the second battery group 12 through the switching circuit 1011, and executing N4 times of discharge of the first battery group 11 to the second energy storage circuit 1013 and the second energy storage circuit 1013 to the first battery group 11, please refer to the relevant description in the above embodiments, and will not be repeated below.

[0217] In the above technical solution, the second energy storage circuit 1013 can also realize the discharge of the first battery group 11 to the second battery group 12, and / or the discharge of the second battery group 12 to the first battery group 11, thereby improving the depolarization effect on the battery.

[0218] According to some embodiments of the present application, during the period when the first battery group 11 discharges to the second battery group 12, it also includes: through the switching circuit 1011, the first battery group 11 discharges to the first energy storage circuit 1012 and the first battery group 11 discharges to the second energy storage circuit 1013 at the same time, and the first energy storage circuit 1012 discharges to the second battery group 12 and the second energy storage circuit 1013 discharges to the second battery group 12 at the same time.

[0219] During the period when the second battery group 12 discharges to the first battery group 11, it also includes: through the switching circuit 1011, the second battery group 12 discharges to the first energy storage circuit 1012 and the first battery group 11 discharges to the second energy storage circuit 1013 at the same time, and the first energy storage circuit 1012 discharges to the first battery group 11 and the second energy storage circuit 1013 discharges to the first battery group 11 at the same time.

[0220] Exemplarily, the first energy storage circuit 1012 includes at least one inductor, and the second energy storage circuit 1013 includes a capacitor. The specific implementation method and principle can refer to the relevant description in the above embodiment, which will not be repeated below.

[0221] In the above technical solution, the first battery group 11 can exchange energy with the second energy storage circuit 1013, which can increase the discharge amount of the first battery group 11 in a short time and improve the discharge efficiency of the first battery group 11, thereby further improving the depolarization effect.

[0222] The present application embodiment provides a battery control circuit, referring to Figures 6 to 9 The battery includes a first battery pack 11 and a second battery pack 12, and the negative electrode of the first battery pack 11 is connected to the negative electrode of the second battery pack 12. The positive electrode and negative electrode of the first battery pack 11 are respectively connected to the first charging positive relay K11 and the charging negative relay K12 of the external charging device 102, and the positive electrode and negative electrode of the second battery pack 12 are respectively connected to the second charging positive relay K21 and the charging negative relay K12 of the charging device 102.

[0223] The control circuit includes: a first switch K1, the first switch K1 connects the positive electrodes of the first battery group 11 and the second battery group 12. The control circuit also includes: a first bridge arm 20, the first end of the first bridge arm 20 is connected to the positive electrode of the first battery group 11, the second end is connected to the negative electrode of the first battery group 11, and the second bridge arm 21, the first end of the second bridge arm 21 is connected to the positive electrode of the second battery group 12, and the second end is connected to the second end of the first bridge arm 20; the first end of the first energy storage circuit 1012 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; the controller 103 is configured to: in response to the voltage of the first battery group 11 and the second battery group 12 being less than or equal to the first threshold, control the first switch K1, the charging negative relay K 12 is closed, and any one of the first charging positive relay K11 and the second charging positive relay K21 is closed, and the charging device 102 is controlled to charge the first battery group 11 and the second battery group 12 connected in parallel; in response to the voltage of the first battery group 11 and / or the second battery group 12 during charging being greater than the first threshold value, the first switch K1 is controlled to be disconnected, and any one of the first charging positive relay K11 and the second charging relay is closed, and the charging negative relay K12 is closed, and the first processing and the second processing are alternately performed on the battery 100 through the first bridge arm 20, the second bridge arm 21 and the first energy storage circuit 1012.

[0224] After the first battery pack 11 and the second battery pack 12 finish discharging each other, the controller 103 controls the first switch K1 and the charging negative relay K12 to close, and one of the first charging positive relay K11 and the second charging positive relay K21 to close, and the other of the first charging positive relay K11 and the second charging positive relay K21 to disconnect, so that the charging device 102 continues to charge the battery 100 until the battery 100 is fully charged.

[0225] The first bridge arm 20 includes: a first upper bridge arm and a first lower bridge arm, the first upper bridge arm is connected to the positive electrode of the first battery group 11, and the first lower bridge arm is connected to the negative electrode of the first battery group 11. The second bridge arm 21 includes: a second upper bridge arm and a second lower bridge arm, the second upper bridge arm is connected to the positive electrode of the second battery group 12, and the second lower bridge arm is connected to the negative electrode of the second battery group 12. The controller 103 is configured to: alternately perform the first operation and the second operation to perform a first process on the battery 100, and the first operation includes: controlling the first The upper bridge arm and the second lower bridge arm are turned on, and the first lower bridge arm and the second upper bridge arm are 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; alternately performing the third operation and the fourth operation to perform a second process on the battery 100, 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, and the fourth operation includes: controlling the first upper bridge arm and the second upper bridge arm to be turned on, and the first lower bridge arm and the second lower bridge arm to be turned off. The first process and the second process can refer to the relevant description in the above embodiment, which will not be repeated here.

[0226] The first energy storage circuit 1012 includes at least one inductor, and capacitors are connected in parallel at both ends of the first battery group 11 .

[0227] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery control circuit, characterized in that: include: A first module, connected to the battery, wherein the battery includes a first battery group and a second battery group, wherein the first battery group and the second battery group are respectively connected to an external charging device; a controller configured to: obtain the voltage of the first battery group and the second battery group during the period when the charging device is charging the battery, and in response to the voltage of the first battery group and / or the second battery group being greater than a first threshold, control the first module to make the first battery group and the second battery group discharge each other; The controller is also configured to: During the mutual discharge of the first battery group and the second battery group, the charging device is controlled to charge at least one of the first battery group and the second battery group.

2. The battery control circuit according to claim 1, characterized in that: The controller is configured to: During the mutual discharge of the first battery pack and the second battery pack, the charging device is controlled to charge one of the first battery pack or the second battery pack.

3. The battery control circuit according to claim 1, characterized in that: The controller is configured to: performing a first process on the battery during a period in which the first battery group and the second battery group discharge each other, The first process includes: executing, through the first module, discharging the first battery pack to the second battery pack, wherein: In the first process, the charging device is controlled to charge the first battery pack.

4. The battery control circuit according to claim 1, characterized in that: The controller is configured to: performing a second process on the battery during a period in which the first battery group and the second battery group discharge each other, The second process includes: executing, through the first module, discharging the second battery pack to the first battery pack, wherein: In the second process, the charging device is controlled to charge the second battery pack.

5. The battery control circuit according to any one of claims 1 to 4, characterized in that: The first module includes: A switch circuit connected to the battery; A first energy storage circuit, connected to the switch circuit and connected to the battery through the switch circuit; The controller is configured to: During the mutual discharge between the first battery group and the second battery group, the switching circuit performs N1 operations of discharging the first battery group to the first energy storage circuit and discharging the first energy storage circuit to the second battery group, so that the first battery group discharges to the second battery group, where N1 is an integer greater than or equal to 1; and Through the switch circuit, the operations of discharging the second battery group to the first energy storage circuit and discharging the first energy storage circuit to the first battery group are performed N2 times, so that the second battery group discharges to the first battery group, and N2 is an integer greater than or equal to 1.

6. The battery control circuit according to claim 5, characterized in that: The negative electrode of the first battery pack is connected to the negative electrode of the second battery pack, and the switch circuit includes: a first bridge arm, wherein a first end of the first bridge arm is connected to the positive electrode of the first battery pack, and a second end of the first bridge arm is connected to the negative electrode of the first battery pack, and a second bridge arm, wherein a first end of the second bridge arm is connected to the positive electrode of the second battery pack, and a second end of the second bridge arm is connected to the second end of the first bridge arm; The first end of the first energy storage circuit is connected to the midpoint of the first bridge arm, and the second end is connected to the midpoint of the second bridge arm. The controller is configured as follows: In response to the voltage of the first battery pack and the second battery pack being less than or equal to a first threshold, controlling the charging device to charge the first battery pack and the second battery pack; In response to the voltage of the first battery group and / or the second battery group being greater than a first threshold during charging, the first battery group and the second battery group are controlled to discharge each other through the first bridge arm, the second bridge arm and the first energy storage circuit.

7. The battery control circuit according to claim 6, characterized in that: The first bridge arm includes: a first upper bridge arm and a first lower bridge arm, the first upper bridge arm is connected to the positive electrode of the first battery pack, and the first lower bridge arm is connected to the negative electrode of the first battery pack. The second bridge arm includes: a second upper bridge arm and a second lower bridge arm, the second upper bridge arm is connected to the positive electrode of the second battery pack, and the second lower bridge arm is connected to the negative electrode of the second battery pack. The controller is configured to: performing a first operation and a second operation alternately so that the first battery pack discharges to the second battery pack, 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; performing the third operation and the fourth operation alternately so that the second battery pack discharges into the first battery pack, 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.

8. The battery control circuit according to claim 6, characterized in that: The battery control circuit also includes: a first switch, connecting the positive electrode of the first battery pack and the positive electrode of the second battery pack; The controller is configured to: In response to the voltage of the first battery pack and the second battery pack being less than or equal to a first threshold, controlling the first switch to close, and controlling the charging device to charge the first battery pack and the second battery pack; In response to the voltage of the first battery group and the second battery group being greater than a first threshold during charging, the first switch is controlled to be disconnected so that the charging device charges the first battery group or the second battery group, and the first battery group and the second battery group are controlled to discharge each other through the first bridge arm, the second bridge arm and the first energy storage circuit.

9. The battery control circuit according to claim 6, characterized in that: A second energy storage circuit is also connected in parallel to both ends of the first battery pack, and the controller is further configured as follows: During the mutual discharge between the first battery pack and the second battery pack, the switching circuit performs N3 operations of discharging the first battery pack to the second energy storage circuit and discharging the second energy storage circuit to the second battery pack, where N3 is an integer greater than or equal to 1; and / or During the mutual discharge between the first battery pack and the second battery pack, the switching circuit performs N4 operations of discharging the first battery pack to the second energy storage circuit and discharging the second energy storage circuit to the first battery pack, where N4 is an integer greater than or equal to 1.

10. The battery control circuit according to claim 9, characterized in that: The controller is also configured to: During the discharge of the first battery group to the second battery group, the first battery group is discharged to the first energy storage circuit and the first battery group is discharged to the second energy storage circuit at the same time, and the first energy storage circuit is discharged to the second battery group and the second energy storage circuit is discharged to the second battery group at the same time through the switch circuit; During the discharge of the second battery group to the first battery group, the switching circuit simultaneously performs the discharge of the second battery group to the first energy storage circuit and the discharge of the first battery group to the second energy storage circuit, and simultaneously performs the discharge of the first energy storage circuit to the first battery group and the discharge of the second energy storage circuit to the first battery group.

11. The battery control circuit according to claim 10, characterized in that: The first energy storage circuit includes at least one inductor, and the second energy storage circuit includes a capacitor.

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

13. An electrical device, characterized in that: The battery system comprises the battery system as claimed in claim 12, wherein the battery system supplies power to the electrical device.

14. A battery charging control method, characterized in that: The battery comprises a first battery pack and a second battery pack, the first battery pack and the second battery pack are respectively connected to an external charging device, and the battery is also connected to a first module, and the method comprises: Acquire voltages of the first battery pack and the second battery pack during charging of the battery by the charging device; In response to the voltage of the first battery group and / or the second battery group being greater than a first threshold, the first module is controlled to make the first battery group and the second battery group discharge each other; wherein, During the mutual discharge of the first battery group and the second battery group, the charging device is controlled to charge at least one of the first battery group and the second battery group.

15. The method according to claim 14, characterized in that During the mutual discharge between the first battery group and the second battery group, the charging current of the charging device for the first battery group or the second battery group is controlled to be smaller than the discharge current of the first battery group to the second battery group, and smaller than the discharge current of the second battery group to the first battery group.

16. The method according to claim 14, characterized in that During the mutual discharge between the first battery group and the second battery group, controlling the charging device to charge at least one of the first battery group and the second battery group comprises: During the mutual discharge of the first battery pack and the second battery pack, the charging device is controlled to charge one of the first battery pack or the second battery pack.

17. The method according to claim 14, characterized in that The causing the first battery group and the second battery group to discharge each other comprises performing a first process on the battery, wherein the first process comprises: performing the discharge of the first battery group to the second battery group through the first module; During the mutual discharge between the first battery group and the second battery group, controlling the charging device to charge at least one of the first battery group and the second battery group comprises: In the first process, the charging device is controlled to charge the first battery pack.

18. The method according to claim 14, characterized in that The causing the first battery group and the second battery group to discharge each other comprises performing a second process on the battery, wherein the second process comprises: performing the discharge of the second battery group to the first battery group through the first module; During the mutual discharge between the first battery group and the second battery group, controlling the charging device to charge at least one of the first battery group and the second battery group comprises: In the second process, the charging device is controlled to charge the second battery pack.

19. The method according to any one of claims 14 to 18, characterized in that The negative electrode of the first battery pack is connected to the negative electrode of the second battery pack, and the first module includes: a switch circuit and a first energy storage circuit, the switch circuit is connected to the battery, and the first energy storage circuit is connected to the switch circuit; The controlling the first module to make the first battery pack and the second battery pack discharge each other includes: By means of the switch circuit, performing N1 operations of discharging the first battery group to the first energy storage circuit and discharging the first energy storage circuit to the second battery group, so that the first battery group discharges to the second battery group, where N1 is an integer greater than or equal to 1; Through the switch circuit, the operations of discharging the second battery group to the first energy storage circuit and discharging the first energy storage circuit to the first battery group are performed N2 times, so that the second battery group discharges to the first battery group, and N2 is an integer greater than or equal to 1.

20. The method according to claim 19, characterized in that The switch circuit includes: a first bridge arm and a second bridge arm, wherein the first end of the first bridge arm is connected to the positive electrode of the first battery pack, and the second end is connected to the negative electrode of the first battery pack, the first end of the second bridge arm is connected to the positive electrode of the second battery pack, and the second end is connected to the second end of the first bridge arm; the first end of the first energy storage circuit is connected to the midpoint of the first bridge arm, and the second end is connected to the midpoint of the second bridge arm, and the method further includes: In response to the voltage of the first battery pack and the second battery pack being less than or equal to a first threshold, controlling the charging device to charge the first battery pack and the second battery pack; wherein, In response to the voltage of the first battery group and / or the second battery group being greater than a first threshold, controlling the first module to make the first battery group and the second battery group discharge each other includes: In response to the voltage of the first battery group and / or the second battery group being greater than a first threshold during charging, the first battery group and the second battery group are controlled to discharge each other through the first bridge arm, the second bridge arm and the first energy storage circuit.

21. The method according to claim 20, characterized in that The first bridge arm includes: a first upper bridge arm and a first lower bridge arm, the first upper bridge arm is connected to the positive electrode of the first battery pack, the first lower bridge arm is connected to the negative electrode of the first battery pack, the second bridge arm includes: a second upper bridge arm and a second lower bridge arm, the second upper bridge arm is connected to the positive electrode of the second battery pack, and the second lower bridge arm is connected to the negative electrode of the second battery pack, The first battery pack discharging the second battery pack comprises: alternately performing a first operation and a second operation, 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 discharging of the second battery pack to the first battery pack includes: alternately performing a third operation and a fourth operation, 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.

22. The method according to claim 20, characterized in that The positive electrode of the first battery pack and the positive electrode of the second battery pack are connected via a first switch, In response to the voltage of the first battery pack and the second battery pack being less than or equal to a first threshold, controlling the charging device to charge the first battery pack and the second battery pack comprises: Controlling the first switch to close, and controlling the charging device to charge the first battery pack and the second battery pack; In response to the voltage of the first battery group and / or the second battery group being greater than a first threshold, controlling the first module to make the first battery group and the second battery group discharge each other includes: In response to the voltage of the first battery pack and the second battery pack being greater than a first threshold during charging, controlling the first switch to be turned off; The charging device is controlled to charge the first battery group or the second battery group, and the first battery group and the second battery group are controlled to discharge each other through the first bridge arm, the second bridge arm and the first energy storage circuit.

23. The method according to claim 19, characterized in that When the first battery pack and the second battery pack are discharging each other, the charging device is controlled to charge the first battery pack. The first battery pack discharging from the second battery pack further comprises: controlling the sum of the charging current of the charging device to the first battery pack and the discharging current of the first battery pack to be equal to the discharging current of the first energy storage circuit to the second battery pack; The discharging of the second battery group to the first battery group further comprises: controlling the sum of the charging current of the charging device to the first battery group and the discharging current of the first energy storage circuit to the first battery group to be equal to the discharging current of the second battery group; or When the first battery pack and the second battery pack are discharging each other, the charging device is controlled to charge the second battery pack. The discharging of the first battery group to the second battery group further comprises: controlling the sum of the charging current of the charging device to the second battery group and the discharging current of the first energy storage circuit to the second battery group to be equal to the discharging current of the first battery group; The discharging of the second battery group to the first battery group further includes: controlling the sum of the charging current of the charging device to the second battery group and the discharging current of the second battery group to be equal to the discharging current of the first energy storage circuit to the first battery group.

24. The method according to claim 20, characterized in that Two ends of the first battery pack are further connected in parallel with a second energy storage circuit, and the method further includes: During the mutual discharge between the first battery pack and the second battery pack, the switching circuit performs N3 operations of discharging the first battery pack to the second energy storage circuit and discharging the second energy storage circuit to the second battery pack, where N3 is an integer greater than or equal to 1; and / or During the mutual discharge between the first battery pack and the second battery pack, the switching circuit performs N4 operations of discharging the first battery pack to the second energy storage circuit and discharging the second energy storage circuit to the first battery pack, where N4 is an integer greater than or equal to 1.

25. The method according to claim 24, characterized in that During the period when the first battery group discharges to the second battery group, the method further includes: performing, through the switch circuit, the discharge of the first battery group to the first energy storage circuit and the discharge of the first battery group to the second energy storage circuit at the same time, and performing the discharge of the first energy storage circuit to the second battery group and the discharge of the second energy storage circuit to the second battery group at the same time; During the period when the second battery group discharges to the first battery group, it also includes: through the switching circuit, simultaneously executing the second battery group discharging to the first energy storage circuit and the first battery group discharging to the second energy storage circuit, and simultaneously executing the first energy storage circuit discharging to the first battery group and the second energy storage circuit discharging to the first battery group.

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