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

Abstract

The application provides a battery control circuit, a battery system, a power consumption device and a battery charging control method, and belongs to the technical field of batteries. The control circuit comprises a first module connected to a battery, wherein 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; a controller is configured to acquire the voltages of the first battery pack and the second battery pack during charging of the battery by the charging device, and in response to the voltage of the first battery pack and / or the second battery pack being greater than a first threshold value, control the first module to make the first battery pack and the second battery pack discharge each other; and 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 the discharging 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 technical field of battery, and particularly relates to a battery control circuit, a battery system, a power consumption device and a battery charging control method. BACKGROUND

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

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

[0004] The present application aims to at least solve one of the technical problems in the background art. To this end, one object of the present application is to provide a battery control circuit, a battery system, a power consumption 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 pack and a second battery pack, the first battery pack and the second battery pack being respectively connected to an external charging device; a controller configured to: obtain the voltages of the first battery pack and the second battery pack during charging of the battery by the charging device, and in response to the voltage of the first battery pack and / or the second battery pack being greater than a first threshold value, control the first module to cause the first battery pack and the second battery pack to discharge to each other; 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 the discharging of the first battery pack and the second battery pack to each other.

[0006] In the technical solution of the embodiment, when the voltage of the first battery pack and / or the second battery pack is greater than the first threshold value, it indicates that the polarization voltage of the first battery pack and / or the second battery pack can be relatively large, and the polarization phenomenon is relatively serious. Based on this, the first module is controlled to make the first battery pack and the second battery pack discharge to each other to depolarize the battery. In the process of discharging, the charge accumulated on the electrodes of the first battery pack and the second battery pack can be quickly reduced, the polarization voltage is reduced, and the polarization phenomenon is improved. The charging device can charge the first battery pack and / or the second battery pack after depolarization with a large current, thereby improving the charging efficiency of the battery. Because of the energy exchange between the first battery pack and the second battery pack, the power of the first battery pack and the second battery pack will not decrease or decrease little after depolarization, thereby ensuring that the time for charging the first battery pack and the second battery pack again after depolarization is shortened to a certain extent. At the same time, during the discharging of the first battery pack and the second battery pack to each other, the charging device maintains charging at least one of the first battery pack and / or the second battery pack, so that the connection between the charging device and the battery can be maintained, and the charging device can directly recharge the battery after depolarization without performing the process of re-interacting 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 control the charging device to charge one of the first battery pack or the second battery pack during the discharging of the first battery pack and the second battery pack to each other. In this way, the first battery pack or the second battery pack that is not charged by the charging device during the discharging of the first battery pack and the second battery pack to each other will not have the phenomenon of continuous accumulation of charge due to being charged, thereby ensuring that it has a good depolarization effect to a certain extent, and the depolarization of the battery can be better improved 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 discharging of the first battery pack and the second battery pack to each other, and the first process includes: performing, by the first module, discharging of 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. Because the discharging speed of the battery is faster than the charging speed, in the first process, the charging device charges the first battery pack while the first battery pack discharges to the second battery pack, thereby avoiding the problem of power loss of the first battery pack due to the excessively fast discharging speed to a certain extent.

[0009] In some embodiments, the controller is configured to perform a second process on the battery during the discharging of the first battery group and the second battery group from each other, the second process comprising: performing, by the first module, discharging of the second battery group to the first battery group, wherein in the second process, the charging device is controlled to charge the second battery group. In the second process, the charging device charges the second battery group, which can avoid the problem of the second battery group being discharged too fast and running out of power, and is conducive to maintaining the normal performance of the first battery group and the second battery group, so as to improve the charging efficiency.

[0010] In some embodiments, the first module comprises: a switching circuit connected to the battery; and a first energy storage circuit connected to the switching circuit and connected to the battery through the switching circuit. The controller is configured to perform, by the switching circuit, N1 times of discharging of the first battery group to the first energy storage circuit and discharging of the first energy storage circuit to the second battery group during the discharging of the first battery group and the second battery group from each other, so that the first battery group discharges to the second battery group, N1 being an integer greater than or equal to 1; and perform, by the switching circuit, N2 times of discharging of the second battery group to the first energy storage circuit and discharging of the first energy storage circuit to the first battery group, so that the second battery group discharges to the first battery group, N2 being an integer greater than or equal to 1. The first energy storage circuit functions as a temporary energy storage, and through the first energy storage circuit, the discharging speed of the first battery group and the second battery group can be controlled, so that the discharging amount of the first battery group and the second battery group each time is not too much, and the probability of the first battery group and the second battery group running out of power is reduced. At the same time, through the switching circuit and the first energy storage circuit, the first battery group can be discharged to the second battery group multiple times, and the second battery group can be discharged to the first battery group multiple times, so that the first battery group and the second battery group are discharged from each other for a relatively long time, and the depolarization effect of the first battery group and the second battery group is enhanced.

[0011] In some embodiments, the negative electrode of the first battery pack and the negative electrode of the second battery pack are connected, the switching circuit comprises: a first bridge arm, a first end of the first bridge arm being connected with the positive electrode of the first battery pack, a second end of the first bridge arm being connected with the negative electrode of the first battery pack, and a second bridge arm, a first end of the second bridge arm being connected with the positive electrode of the second battery pack, a second end of the second bridge arm being connected with the second end of the first bridge arm; a first end of the first energy storage circuit is connected with a midpoint of the first bridge arm, a second end of the first energy storage circuit is connected with a midpoint of the second bridge arm, and 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 the first threshold value, control the charging device to charge the first battery pack and the second battery pack; and in response to the voltage of the first battery pack and / or the second battery pack during charging being greater than the first threshold value, control the first battery pack and the second battery pack to discharge to each other through the first bridge arm, the second bridge arm and the first energy storage circuit. That is, the first ends of the first bridge arm and the second bridge arm are connected with the positive electrodes of the first battery pack and the second battery pack respectively, the second ends of the first bridge arm and the second bridge arm are connected with the negative electrodes of the first battery pack and the second battery pack respectively, 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 pack and the second battery pack respectively, so that the first battery pack and the second battery pack can discharge to each other through the first energy storage circuit to reduce the voltage of the first battery pack and the second battery pack, and when the voltage of the first battery pack and / or the second battery pack 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 comprises: a first upper bridge arm connected to a positive electrode of the first battery pack and a first lower bridge arm connected to a negative electrode of the first battery pack, and the second bridge arm comprises: a second upper bridge arm connected to a positive electrode of the second battery pack and a second lower bridge arm connected to a negative electrode of the second battery pack. The controller is configured to: alternately perform a first operation and a second operation to cause the first battery pack to discharge to the second battery pack, the first operation comprising: 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 comprising: 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; and alternately perform a third operation and a fourth operation to cause the second battery pack to discharge to the first battery pack, the third operation comprising: 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 comprising: 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 discharging of the first energy storage circuit to the second battery pack, the first energy storage circuit, the first battery pack and the second battery pack can form a loop, and the first battery pack can continuously discharge to the first energy storage circuit, thereby further improving the depolarization effect on the first battery pack. Moreover, the voltage of the first battery pack and the first energy storage circuit connected in series can be greater than the voltage of the second battery pack, thereby improving the success rate of smooth discharging of the first energy storage circuit to the second battery pack. Similarly, during discharging of the first energy storage circuit to the first battery pack, the first energy storage circuit, the first battery pack and the second battery pack can form a loop, and the second battery pack can continuously discharge to the first energy storage circuit, thereby improving the success rate of smooth discharging of the first energy storage circuit to the first battery pack and improving the depolarization effect on the second battery pack.

[0013] In some embodiments, the battery control circuit further comprises: a first switch connected between the positive pole of the first battery pack and the positive pole 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 the first threshold value, control the first switch to be closed, and control the charging device to charge the first battery pack and the second battery pack; in response to the voltage of the first battery pack and the second battery pack during charging being greater than the first threshold value, control the first switch to be opened, so that the charging device charges the first battery pack or the second battery pack, and controls the first battery pack and the second battery pack to discharge to 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 pack and the second battery pack are in parallel, thereby enabling the first battery pack and the second battery pack to be simultaneously charged through any one of the first output end and the second output end, and the voltage of the first battery pack and the second battery pack is consistent, which is conducive to maintaining the energy balance of the first battery pack and the second battery pack during charging and maintaining the stability of the battery performance. When it is detected that the voltage of any one of the first battery pack and the second battery pack is greater than the first threshold value, the first switch is opened, i.e. the first battery pack and the second battery pack are not in parallel, so that the first battery pack and the second battery pack can form a charging and discharging loop through the first bridge arm and the second bridge arm respectively, thereby realizing the depolarization of the battery. That is, by opening and closing the first switch, the charging state and the depolarization state of the battery can be switched.

[0014] In some embodiments, the two ends of the first battery pack are further connected in parallel with a second energy storage circuit, and the controller is further configured to: during the discharging of the first battery pack to the second battery pack and the discharging of the second battery pack to the first battery pack, perform N3 times of discharging of the first battery pack to the second energy storage circuit and discharging of the second energy storage circuit to the second battery pack through the switching circuit, N3 being an integer greater than or equal to 1; and / or during the discharging of the first battery pack to the second battery pack and the discharging of the second battery pack to the first battery pack, perform N4 times of discharging of the first battery pack to the second energy storage circuit and discharging of the second energy storage circuit to the first battery pack through the switching circuit, N4 being an integer greater than or equal to 1. The second energy storage circuit can also realize the discharging of the first battery pack to the second battery pack and / or the discharging of the second battery pack to the first battery pack, thereby improving the depolarization effect of the battery.

[0015] In some embodiments, the controller is further configured to, during discharging of the first battery pack to the second battery pack, simultaneously perform discharging of the first battery pack to the first energy storage circuit and the first battery pack to the second energy storage circuit, and simultaneously perform discharging of the first energy storage circuit to the second battery pack and the second energy storage circuit to the second battery pack through the switching circuit; during discharging of the second battery pack to the first battery pack, simultaneously perform discharging of the second battery pack to the first energy storage circuit and the first battery pack to the second energy storage circuit, and simultaneously perform discharging of the first energy storage circuit to the first battery pack and the second energy storage circuit to the first battery pack through the switching circuit. In this way, the first battery pack can exchange energy with the second energy storage circuit, can increase the discharging amount of the first battery pack in a short time, and can improve the discharging efficiency of the first battery pack, thereby further improving the depolarization effect.

[0016] In some embodiments, the first energy storage circuit includes at least one inductor, and the second energy storage circuit includes at least one capacitor. The capacitor can store a large amount of electricity, and can improve the energy transfer efficiency between the first battery pack and the second battery pack, thereby making the battery have a better depolarization effect. The capacitor has a small size, and the capacitor can realize fast charging and discharging. In this way, the depolarization effect on the battery is further improved, the size of the battery control circuit is kept small, the weight of the battery control circuit is reduced, and the cost is reduced.

[0017] Embodiments of the second aspect of the application provide a battery system including the battery control circuit in the above embodiments.

[0018] Embodiments of the third aspect of the application provide a use device including the battery system in the above embodiments, and the battery system is used to provide electric energy.

[0019] Embodiments of the fourth aspect of the application provide a battery charging control method. The battery includes 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 further connected to a first module. The method includes: obtaining voltages of the first battery pack and the second battery pack during charging of the charging device to the battery; in response to the voltage of the first battery pack and / or the second battery pack being greater than a first threshold value, controlling the first module to discharge the first battery pack and the second battery pack to each other; and during discharging of the first battery pack and the second battery pack to each other, controlling the charging device to charge at least one of the first battery pack and the second battery pack.

[0020] In the above technical solution, during the discharging process, the accumulated charge on the electrodes of the first battery pack and the second battery pack can be rapidly reduced, the polarization voltage is reduced, and the polarization phenomenon is improved, so that the first battery pack and / or the second battery pack after depolarization can be charged with a large current. At the same time, during the mutual discharging of the first battery pack and the second battery pack, the charging device maintains charging at least one of the first battery pack and / or the second battery pack, 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 performing the process of re-interacting the charging device and the battery, thereby further shortening the charging time and improving the charging efficiency.

[0021] In some embodiments, during the mutual discharging of the first battery pack and the second battery pack, the control of the charging current of the charging device to the first battery pack or the second battery pack is less than the discharging current of the first battery pack to the second battery pack, and less than the discharging current of the second battery pack to the first battery pack. In this way, the amount of charge accumulated on the electrodes of the first battery pack or the second battery pack when the charging device charges the first battery pack or the second battery pack can be ensured to be less than the amount of charge released during the discharging process of the first battery pack and the second battery pack, so that the first battery pack and the second battery pack have a good depolarization effect and the depolarization phenomenon of the battery is improved.

[0022] In some embodiments, during the mutual discharging of the first battery pack and the second battery pack, the control of the charging device to charge at least one of the first battery pack and the second battery pack includes: during the mutual discharging of the first battery pack and the second battery pack, the control of the charging device to charge one of the first battery pack or the second battery pack. In this way, the first battery pack or the second battery pack that is not charged by the charging device during the mutual discharging of the first battery pack and the second battery pack will not continuously accumulate charge due to being charged, and the first battery pack or the second battery pack has a good depolarization effect to some extent, thereby improving the depolarization of the battery while maintaining the connection between the charging device and the battery.

[0023] In some embodiments, the mutual discharging of the first battery pack and the second battery pack includes performing a first process on the battery, and the first process includes: performing, by the first module, discharging of the first battery pack to the second battery pack; and during the mutual discharging of the first battery pack and the second battery pack, the control of the charging device to charge at least one of the first battery pack and the second battery pack includes: during the first process, the control of the charging device to charge the first battery pack. In this way, the first battery pack can be prevented from being discharged too quickly and losing power to some extent, which is beneficial to maintaining the normal performance of the first battery pack and improving the charging efficiency.

[0024] In some embodiments, discharging the first battery group and the second battery group from each other includes performing a second process on the battery, and the second process includes: by the first module, discharging the second battery group to the first battery group; and during discharging the first battery group and the second battery group from each other, controlling the charging device to charge at least one of the first battery group and the second battery group includes: in the second process, controlling the charging device to charge the second battery group. Thus, the problem of the second battery group being discharged too quickly and running out of power can be avoided to some extent, and the normal performance of the second battery group can be maintained to improve the charging efficiency.

[0025] In some embodiments, the negative electrode of the first battery group and the negative electrode of the second battery group are connected, and the first module includes: a switching circuit connected to the battery and a first energy storage circuit connected to the switching circuit. Discharging the first battery group and the second battery group from each other includes: by the switching circuit, discharging the first battery group to the first energy storage circuit and discharging the first energy storage circuit to the second battery group N1 times to discharge the first battery group to the second battery group, where N1 is an integer greater than or equal to 1; and by the switching circuit, discharging the second battery group to the first energy storage circuit and discharging the first energy storage circuit to the first battery group N2 times to discharge the second battery group to the first battery group, where N2 is an integer greater than or equal to 1. The first energy storage circuit temporarily stores energy, and by the first energy storage circuit, the discharging speed of the first battery group and the second battery group can be controlled, so that the discharging amount of the first battery group and the second battery group each time is not too much, and the probability of the first battery group and the second battery group running out of power is reduced. At the same time, by the switching circuit and the first energy storage circuit, the first battery group can be discharged to the second battery group multiple times, and the second battery group can be discharged to the first battery group multiple times, so that the first battery group and the second battery group are discharged from each other for a relatively long time, and the depolarization effect of the first battery group and the second battery group is enhanced.

[0026] In some embodiments, the switching circuit comprises: a first bridge arm and a second bridge arm, a first end of the first bridge arm is connected to a positive pole of the first battery pack, a second end of the first bridge arm is connected to a negative pole of the first battery pack, a first end of the second bridge arm is connected to a positive pole 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; a first end of the first energy storage circuit is connected to a midpoint of the first bridge arm, and a second end of the first energy storage circuit is connected to a midpoint of the second bridge arm; the method further comprises: in response to the voltage of the first battery pack and the second battery pack being less than or equal to a first threshold value, 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 pack and / or the second battery pack being greater than the first threshold value, controlling the first module to discharge the first battery pack and the second battery pack from each other, comprising: in response to the voltage of the first battery pack and / or the second battery pack during charging being greater than the first threshold value, controlling the first battery pack and the second battery pack 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 pack and the second battery pack respectively, so that the first battery pack and the second battery pack can discharge from each other through the first energy storage circuit to reduce the voltage of the first battery pack and the second battery pack, and when the voltage of the first battery pack and / or the second battery pack 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 comprises: a first upper bridge arm and a first lower bridge arm, the first upper bridge arm is connected to the positive pole of the first battery pack, and the first lower bridge arm is connected to the negative pole of the first battery pack; the second bridge arm comprises: a second upper bridge arm and a second lower bridge arm, the second upper bridge arm is connected to the positive pole of the second battery pack, and the second lower bridge arm is connected to the negative pole of the second battery pack; discharging the first battery pack to the second battery pack comprises: alternately performing a first operation and a second operation, the first operation comprises: 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 comprises: 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; discharging the second battery pack to the first battery pack comprises: alternately performing a third operation and a fourth operation, the third operation comprises: 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 comprises: 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 discharging of the first energy storage circuit to the second battery pack, the first energy storage circuit, the first battery pack and the second battery pack can form a loop, and the first battery pack can continuously discharge to the first energy storage circuit, further improving the depolarization effect on the first battery pack. Similarly, during discharging of the first energy storage circuit to the first battery pack, the first energy storage circuit, the first battery pack and the second battery pack can form a loop, and the second battery pack can continuously discharge to the first energy storage circuit, improving the depolarization effect on the second battery pack.

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

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

[0030] In some embodiments, the first battery pack is also connected in parallel with a second energy storage circuit, and the method further comprises: during the discharging of the first battery pack and the second battery pack to each other, performing, by the switching circuit, N3 times of discharging of the first battery pack to the second energy storage circuit and discharging of the second energy storage circuit to the second battery pack, N3 being an integer greater than or equal to 1; and / or during the discharging of the first battery pack and the second battery pack to each other, performing, by the switching circuit, N4 times of discharging of the first battery pack to the second energy storage circuit and discharging of the second energy storage circuit to the first battery pack, N4 being an integer greater than or equal to 1. The second energy storage circuit can also realize discharging of the first battery pack to the second battery pack and / or discharging of the second battery pack to the first battery pack, thereby improving the depolarization effect on the battery.

[0031] In some embodiments, during the discharging of the first battery pack to the second battery pack, the method further comprises: simultaneously performing, by the switching circuit, discharging of the first battery pack to the first energy storage circuit and discharging of the first battery pack to the second energy storage circuit, and simultaneously performing discharging of the first energy storage circuit to the second battery pack and discharging of the second energy storage circuit to the second battery pack; and during the discharging of the second battery pack to the first battery pack, the method further comprises: simultaneously performing, by the switching circuit, discharging of the second battery pack to the first energy storage circuit and discharging of the first battery pack to the second energy storage circuit, and simultaneously performing discharging of the first energy storage circuit to the first battery pack and discharging of the second energy storage circuit to the first battery pack. The first battery pack can exchange energy with the second energy storage circuit, can increase the discharging amount of the first battery pack in a short time, and improve the discharging efficiency of the first battery pack, thereby further improving the depolarization effect.

[0032] The above description is only a summary of the technical solutions of the present application. In order to enable the technical means of the present application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more apparent and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0033] In the drawings, like reference numerals refer to like elements throughout the various drawings. The drawings are not necessarily to scale, emphasis instead being placed on illustrating the principles of the application. It should be understood that the drawings are only intended to depict some embodiments of the application and are not intended to limit the scope of the application.

[0034] Figure 1 One of the functional block diagrams of the battery control circuit of some embodiments of the present application;

[0035] Figure 2 The second of the functional block diagrams of the battery control circuit of some embodiments of the present application;

[0036] Figure 3Figure 1 shows a current waveform diagram of the first energy storage circuit during the discharging of the first battery pack by the second battery pack in some embodiments of the present application;

[0037] Figure 4 Figure 2 shows a current waveform diagram of the first energy storage circuit during the discharging of the second battery pack by the first battery pack in some embodiments of the present application;

[0038] Figure 5 Figure 3 shows a schematic diagram of the battery control circuit in some embodiments of the present application;

[0039] Figure 6 Figure 4 shows a schematic diagram of the current path during the discharging of the first battery pack by the second battery pack in some embodiments of the present application;

[0040] Figure 7 Figure 5 shows a schematic diagram of the current path during the discharging of the first battery pack by the second battery pack in some embodiments of the present application;

[0041] Figure 8 Figure 6 shows a schematic diagram of the current path during the discharging of the second battery pack by the first battery pack in some embodiments of the present application;

[0042] Figure 9 Figure 7 shows a schematic diagram of the current path during the discharging of the second battery pack by the first battery pack in some embodiments of the present application;

[0043] Figure 10 Figure 8 shows a schematic diagram of the battery control circuit in some embodiments of the present application;

[0044] Figure 11 Figure 9 shows a schematic diagram of the battery control circuit in some embodiments of the present application;

[0045] Figure 12 Figure 10 shows a flowchart of the battery charging control method in some embodiments of the present application;

[0046] Figure 13 Figure 11 shows a flowchart of the battery charging control method in some embodiments of the present application.

[0047] Legend of reference numerals:

[0048] Switching circuit 1011, first energy storage circuit 1012, second energy storage circuit 1013;

[0049] Battery 100, first module 101, charging device 102, controller 103;

[0050] First battery pack 11, second battery pack 12, first bridge arm 20, second bridge arm 21, current sensor 23, first connector 24, second connector 25;

[0051] 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

[0052] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "include" and "have" and any variations thereof used in the specification and the claims and the above description of drawings are intended to cover the inclusion not the exclusion of one or more elements.

[0054] 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 specifically limited.

[0055] In this paper, the "embodiment" means that the specific features, structures or properties described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0056] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents a "or" relationship between the front and rear associated objects.

[0057] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0058] During the charging or discharging process of the battery, polarization phenomenon occurs. In some cases, one of the reasons for the polarization phenomenon of the battery is that when a large current flows through the electrode, charges will accumulate on the positive and negative electrodes of the battery, thereby causing the potential of the electrode to deviate from the equilibrium potential, resulting in a difference between the actual potential of the battery and the equilibrium potential. This difference results in a polarization voltage, and the larger the charging current, the more charges accumulate on the electrode, and the larger the polarization voltage. The existence of the polarization voltage increases the resistance of the battery, resulting in a smaller current flowing through the battery, thereby reducing the charging efficiency of the battery.

[0059] The size 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 voltage of the battery is too high, a more serious polarization phenomenon may have occurred, thereby reducing the charging efficiency of the battery.

[0060] Based on the above considerations, a battery control circuit is designed. The battery includes a first battery pack and a second battery pack connected, and the first battery pack and the second battery pack are connected to the first output end and the second output end of the charging device, respectively.

[0061] When the voltage of the first battery pack and / or the second battery pack is greater than the first threshold value, it indicates that the polarization voltage of the first battery pack and / or the second battery pack may be large, and the polarization phenomenon is more serious. Based on this, the controller controls the first module to make the first battery pack and the second battery pack discharge to each other in response to the voltage of the first battery pack and / or the second battery pack being greater than the first threshold value. During the discharging process, the accumulated charges on the electrodes of the first battery pack and the second battery pack can be quickly reduced, the polarization voltage is reduced, and the polarization phenomenon is improved. The charging device can charge the first battery pack and / or the second battery pack after depolarization with a large current, thereby improving the charging efficiency of the battery.

[0062] Due to the energy exchange between the first battery pack and the second battery pack, the first battery pack and the second battery pack discharge to each other, and the power of the first battery pack and the second battery pack will not decrease or decrease little, thereby being able to guarantee to a certain extent that the time for charging the first battery pack and the second battery pack again after the first battery pack and the second battery pack discharge to each other is shortened.

[0063] At the same time, during the discharging process of the first battery pack and the second battery pack to each other, the charging device maintains charging at least one of the first battery pack and / or the second battery pack. In this way, the connection between the charging device and the battery can be maintained, and after the depolarization ends, the charging device can directly recharge the battery without performing the process of re-interacting the charging device with the battery, thereby further shortening the charging time and improving the charging efficiency.

[0064] The battery control circuit disclosed in the embodiments of the present application can be used in the charging of the battery in an electric device such as a vehicle, a ship, or an aircraft, but is not limited thereto.

[0065] Electrical devices can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0066] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0067] The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery is installed inside the vehicle, which can be located at the bottom, front, or rear of the vehicle. The battery can be used to power the vehicle; for example, it can serve as the vehicle's operating power source.

[0068] In some embodiments of this application, the battery can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0069] refer to Figure 1 This application provides a battery control circuit, including: a first module 101 connected to a battery 100, the battery 100 including a first battery pack 11 and a second battery pack 12, the first battery pack 11 and the second battery pack 12 being respectively connected to an external charging device 102. The battery control circuit further includes: a controller 103 configured to: acquire the voltage of the first battery pack 11 and the second battery pack 12 during the charging of the battery 100 by the charging device 102, and in response to the voltage of the first battery pack 11 and / or the second battery pack 12 being greater than a first threshold, control the first module 101 to cause the first battery pack 11 and the second battery pack 12 to discharge to each other; the controller 103 is further configured to: control the charging device 102 to charge at least one of the first battery pack 11 and the second battery pack 12 during the mutual discharge of the first battery pack 11 and the second battery pack 12.

[0070] The first battery pack 11 and the second battery pack 12 can be connected in series or in parallel. The first module 101 connects the positive and negative terminals of the first battery pack 11 and the positive and negative terminals of the second battery pack 12, thereby forming circuits with the first battery pack 11 and the second battery pack 12 respectively, to achieve discharge of the first battery pack 11 and the second battery pack 12. By controlling the first module 101, the first battery pack 11 and the second battery pack 12 can discharge to each other, thereby achieving depolarization of the battery 100.

[0071] In some embodiments, the controller 103 can control the first module to discharge the first battery pack 11 and the second battery pack 12 to each other in response to the voltage of one of the first battery pack 11 or the second battery pack 12 being greater than a first threshold. It can be understood that discharging the first battery pack 11 to the second battery pack 12 is equivalent to charging the second battery pack 12, and discharging the second battery pack 12 to the first battery pack 11 is equivalent to charging the first battery pack 11. Since the first battery pack 11 and the second battery pack 12 exchange energy during discharging, i.e., the first battery pack 11 and the second battery pack 12 both include the process of being charged and being discharged, the voltage of one of the first battery pack 11 and the second battery pack 12 that is less than or equal to the first threshold will not increase during discharging, thereby achieving a better depolarization effect on the battery 100 as a whole.

[0072] In other embodiments, the controller 103 can also control the first module to discharge the first battery pack 11 and the second battery pack 12 to each other in response to the voltage of both the first battery pack 11 and the second battery pack 12 being greater than the first threshold.

[0073] It can be understood that during charging, if the first battery pack 11 and the second battery pack 12 are connected in series, the controller 103 can control the first module to discharge the first battery pack 11 and the second battery pack 12 to each other in response to the voltage of at least one of the first battery pack 11 or the second battery pack 12 being greater than the first threshold. If the first battery pack 11 and the second battery pack 12 are connected in parallel during charging, the controller 103 can control the first module to discharge the first battery pack 11 and the second battery pack 12 to each other in response to the voltage of both the first battery pack 11 and the second battery pack 12 being greater than the first threshold.

[0074] The first threshold can be a specific voltage value or a range value. The first threshold can be adjusted according to the type of the battery 100. The method of setting the first threshold can be to test the relationship between the charging rate of the battery 100 and the voltage of the first battery pack 11 and the second battery pack 12 in advance. When the voltage of the first battery pack 11 and the second battery pack 12 is lower than a certain value or within a certain range, the charging rate decreases significantly, and the voltage value or range value can be set as the first threshold. Exemplarily, the first threshold can be 80% of the voltage when the battery 100 is fully charged.

[0075] The charging device 102 can include, but is not limited to, a charging pile and other devices capable of charging the battery 100.

[0076] In some embodiments, the first battery pack 11 can be connected to a first output of the charging device 102, and the second battery pack 12 can be connected to a second output of the charging device 102. The first output of the charging device 102 can include a first positive terminal and a first negative terminal, and the second output 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 terminal and the negative terminal of the first battery pack 11, respectively, and the second positive terminal and the second negative terminal can be connected to the positive terminal and the negative terminal of the second battery pack 12, respectively.

[0077] In other embodiments, the first output can include a first positive terminal, and the second output can include a second positive terminal. The charging device 102 can further include a negative terminal, and the first output and the second output can share the same negative terminal. That is, the first positive terminal is connected to the positive terminal of the first battery pack 11, the second positive terminal is connected to the positive terminal of the second battery pack 12, and the negative terminal of the first battery pack 11 and the negative terminal of the second battery pack 12 are both connected to the negative terminal.

[0078] 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 pack 11 and the second battery pack 12, respectively.

[0079] In some embodiments, the charging device 102 can include a power module for adjusting 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, the second negative terminal, can all be output terminals of the power module.

[0080] By providing the first output and the second output, the charging device 102 can charge at least one of the first battery pack 11 or the second battery pack 12 during the process of discharging the first battery pack 11 and the second battery pack 12 from each other.

[0081] In some embodiments, during the normal charging process of the first battery pack 11 and the second battery pack 12 by the charging device 102, the charging device 102 can also charge the first battery pack 11 and the second battery pack 12 through the first output and the second output, respectively. Alternatively, when the first battery pack 11 and the second battery pack 12 are connected in parallel, the charging device 102 can also charge the first battery pack 11 and the second battery pack 12 simultaneously through the first output or the second output.

[0082] Before the charging device 102 charges the battery 100, it usually needs to interact with the battery 100. The interaction process can include a charging handshake phase and a charging configuration phase.

[0083] 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 a handshake stage with the battery 100. The handshake stage refers to that the charging pile establishes a communication connection with the battery 100 and negotiates charging parameters. The handshake stage can usually include a handshake start stage and a handshake identification stage. For example, the charging pile can send a handshake start message to the BMS. After the BMS receives the handshake start message, it replies to the confirmation within a specified time, indicating that it is ready to charge. Then it enters the handshake identification stage, which is mainly used for information exchange and identity verification.

[0084] Since the interaction process of the charging device 102 and the battery 100 is a fixed process, after the charging device 102 is disconnected from the battery 100 each time, if it needs to be charged again, it needs to interact again, that is, it needs to re-enter the handshake stage. The handshake stage needs to consume a lot of time, thereby causing the charging process to be complicated and time-consuming.

[0085] Based on this, in the embodiments of the present application, during the mutual discharging of the first battery pack 11 and the second battery pack 12, the connection between the charging device 102 and at least one of the first battery pack 11 or the second battery pack 12 is maintained, that is, the connection between the charging device 102 and the battery 100 is maintained, so that when the charging is restarted subsequently, since it is detected that the charging device 102 and the battery 100 group are connected, the handshake stage will not be re-entered.

[0086] The controller 103 can include but is not limited to the MCU (Microcontroller Unit) of the vehicle or the controller 103 in the BMS (Battery Management System) of the battery 100.

[0087] In some embodiments, the battery 100 also has a voltage sensor for detecting the voltage of the first battery pack 11 and the second battery pack 12. The voltage sensor is in communication connection with the BMS. The controller 103 in the BMS can receive the voltage information of the first battery pack 11 and the second battery pack 12 detected by the voltage sensor, and in response to the voltage of the first battery pack 11 and / or the second battery pack 12 being greater than a first threshold, send a message to the charging device 102 to make the first battery pack 11 and the second battery pack 12 discharge to each other during the discharge of the first battery pack 11 and the second battery pack 12, and control the first module 101 to make the first battery pack 11 and the second battery pack 12 discharge to each other. After the charging device 102 receives the message to make the first battery pack 11 and the second battery pack 12 discharge to each other, it performs charging on at least one of the first battery pack 11 and / or the second battery pack 12.

[0088] In some embodiments, the first module 101 can include, but is not limited to, a capacitor, an inductor, or the like, which has a function of charging and discharging. The capacitor or the inductor has a function of charging and discharging, and when one of the first battery pack 11 or the second battery pack 12 forms a loop with the first module 101, the capacitor or the inductor can temporarily store the electrical energy released by one of the first battery pack 11 or the second battery pack 12. After the other one of the first battery pack 11 or the second battery pack 12 forms a loop with the first module 101, the capacitor or the inductor releases the electrical energy to the other one of the first battery pack 11 or the second battery pack 12, thereby realizing the discharging of the first battery pack 11 to the second battery pack 12 or the discharging of the second battery pack 12 to the first battery pack 11.

[0089] In the above technical solution, during the discharging process, the accumulated charge on the electrodes of the first battery pack 11 and the second battery pack 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 pack 11 and / or the second battery pack 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 pack 11 and the second battery pack 12, the electrical quantity of the first battery pack 11 and the second battery pack 12 will not decrease or decrease little after the first battery pack 11 and the second battery pack 12 discharge each other, thereby avoiding the problem that the electrical quantity is too low due to the excessive discharging of the first battery pack 11 and the second battery pack 12 during the discharging process, and the charging time is increased. At the same time, during the discharging process of the first battery pack 11 and the second battery pack 12, the charging device 102 maintains charging at least one of the first battery pack 11 and / or the second battery pack 12, thereby maintaining the connection between the charging device 102 and the battery 100. After the discharging process is completed, the charging device 102 can directly recharge the battery 100 without performing the process of re-interacting the charging device 102 and the battery 100, thereby further shortening the charging time and improving the charging efficiency.

[0090] 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 discharging process of the first battery pack 11 and the second battery pack 12.

[0091] For example, the controller 103 is configured to charge the first battery pack 11 through the first output terminal during the discharging process of the first battery pack 11 and the second battery pack 12. Or the controller 103 is configured to charge the second battery pack 12 through the second output terminal during the discharging process of the first battery pack 11 and the second battery pack 12. It is worth noting that during the charging process of the first battery pack 11 or the second battery pack 12 by the charging device 102 through one of the first output terminal or the second output terminal, the other one of the first output terminal or the second output terminal is disconnected from the corresponding first battery pack 11 or second battery pack 12.

[0092] In the technical solution, the first battery group 11 or the second battery group 12 that is not charged by the charging device 102 during the discharging of the first battery group 11 and the second battery group 12 from each other does not accumulate charges due to being charged, which guarantees a good depolarization effect to some extent, and thus the depolarization of the battery 100 can be improved while maintaining the connection between the charging device 102 and the battery 100.

[0093] According to some embodiments of the present application, the controller 103 is configured to perform a first process on the battery 100 during the discharging of the first battery group 11 and the second battery group 12 from each other, and the first process includes: performing, by the first module 101, discharging of the first battery group 11 to the second battery group 12, and in the first process, the charging device 102 is controlled to charge the first battery group 11.

[0094] The controller 103 can control the charging device 102 to charge the first battery group 11 through the first output terminal in the first process by sending a message of the first process to the charging device 102.

[0095] In the technical solution, since the discharging speed of the battery 100 is faster than the charging speed, the charging device 102 charges the first battery group 11 while the first battery group 11 discharges to the second battery group 12 in the first process, which can avoid the problem of power loss of the first battery group 11 due to too fast discharging speed to some extent.

[0096] According to some embodiments of the present application, the controller 103 is configured to perform a second process on the battery 100 during the discharging of the first battery group 11 and the second battery group 12 from each other, and the second process includes: performing, by the first module 101, discharging of the second battery group 12 to the first battery group 11, and in the second process, the charging device 102 is controlled to charge the second battery group 12.

[0097] In some embodiments, the first process and the second process can be performed during the discharging of the first battery group 11 and the second battery group 12 from each other, and the first process and the second process can be alternately performed, for example.

[0098] The controller 103 can control the charging device 102 to charge the second battery group 12 through the second output terminal in the first process by sending a message of the second process to the charging device 102.

[0099] In the technical solution, the charging device 102 charges the second battery group 12 in the second process, which can avoid the problem of power loss of the second battery group 12 due to too fast discharging speed to some extent, and is conducive to maintaining the normal performance of the second battery group 12 to improve the charging efficiency.

[0100] It can be understood that in other embodiments, only the first processing can be performed during the mutual discharging of the first battery pack 11 and the second battery pack 12, and in the first processing, the charging device 102 is controlled to charge the first battery pack 11. Alternatively, only the second processing can be performed during the mutual discharging of the first battery pack 11 and the second battery pack 12, and in the second processing, the charging device 102 is controlled to charge the second battery pack 12.

[0101] Reference Figure 2 According to some embodiments of the present application, the first module 101 comprises: a switching circuit 1011 connected to the battery 100; a first energy storage circuit 1012 connected to the switching circuit 1011 and connected to the battery 100 through the switching circuit 1011; and the controller 103 is configured to: during the mutual discharging of the first battery pack 11 and the second battery pack 12, perform N1 times of the operation of discharging the first battery pack 11 to the first energy storage circuit 1012 and discharging the first energy storage circuit 1012 to the second battery pack 12 through the switching circuit 1011, so that the first battery pack 11 discharges to the second battery pack 12, N1 being an integer greater than or equal to 1; and perform N2 times of the operation of discharging the second battery pack 12 to the first energy storage circuit 1012 and discharging the first energy storage circuit 1012 to the first battery pack 11 through the switching circuit 1011, so that the second battery pack 12 discharges to the first battery pack 11, N2 being an integer greater than or equal to 1.

[0102] The switch circuit 1011 is configured to form a loop between the first battery pack 11 and the first energy storage circuit 1012, and form a loop between the first energy storage circuit 1012 and the second battery pack 12. The first energy storage circuit 1012 is configured to temporarily store energy. The first battery pack 11 and the second battery pack 12 are configured to discharge to each other through the first energy storage circuit 1012. For example, the first battery pack 11 and the second battery pack 12 are connected in series. The switch circuit 1011 includes a first bridge arm. The first bridge arm includes 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. The first lower bridge arm is connected to the negative electrode of the battery 100. A 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. The second end of the first energy storage circuit 1012 is connected to the midpoint between the first battery pack 11 and the second battery pack 12. The controller 103 is configured to: in response to the voltage of the first battery pack 11 and the voltage of the second battery pack 12 being less than or equal to the first threshold value, control the charging device 102 to charge the battery 100; in response to the voltage of at least one of the first battery pack 11 and the second battery pack 12 being greater than the first threshold value, perform discharging of the first battery pack 11 to the first energy storage circuit 1012 and discharging of the first energy storage circuit 1012 to the second battery pack 12 through the first bridge arm to perform first processing on the battery 100, and perform discharging of the second battery pack 12 to the first energy storage circuit 1012 and discharging of the first energy storage circuit 1012 to the first battery pack 11 through the first bridge arm to perform second processing on the battery 100.

[0103] In other words, in the first processing, the step of discharging the first battery pack 11 to the first energy storage circuit 1012 and the step of discharging the first energy storage circuit 1012 to the second battery pack 12 are alternately repeated N1 times. In the second processing, the step of discharging the second battery pack 12 to the first energy storage circuit 1012 and the step of discharging the first energy storage circuit 1012 to the first battery pack 11 are alternately repeated N2 times.

[0104] The values of N1 and N2 can be set according to the first threshold value and different types of the battery 100. After performing the operation of discharging the first battery pack 11 to the first energy storage circuit 1012 and discharging the first energy storage circuit 1012 to the second battery pack 12 N1 times, and performing the operation of discharging the second battery pack 12 to the first energy storage circuit 1012 and discharging the first energy storage circuit 1012 to the first battery pack 11 N2 times, the voltage of the first battery pack 11 and the voltage of the second battery pack 12 can be less than or equal to the first threshold value. The values of N1 and N2 can be the same or different.

[0105] Compared to performing one operation 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 performing one operation of discharging the second battery pack 12 to the first energy storage circuit 1012 and the first energy storage circuit 1012 to the first battery pack 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 pack 11 and the second battery pack 12.

[0106] Furthermore, such as Figure 3 As shown, Figure 3 The diagram shows the waveform of the current through the first energy storage circuit 1012 during the mutual discharge of the first battery pack 11 and the second battery pack 12, when the operation 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 is performed N1 times, and when the operation 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 is performed N2 times.

[0107] 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 direction of current flow through the first energy storage circuit 1012 remains unchanged. However, due to the energy released by the first energy storage circuit 1012, the current in the first energy storage circuit 1012 gradually decreases from a positive first current to a positive second current I. down .

[0108] Repeat the above process so that during the first processing period, the current in the first energy storage circuit 1012 is at a positive first current I. up and the positive second current I down The current alternates between these states until the first processing ends, at which point the current in the first energy storage circuit 1012 becomes 0.

[0109] After the first process ends, 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, causing the current in the first energy storage circuit 1012 to gradually increase. 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, the current flowing through the first energy storage circuit 1012 is reversed compared to the first process, therefore the current is negative. The current in the first energy storage circuit 1012 is at a negative first current - I. up and the negative second current -I downThe current alternates between these states until the second processing ends, at which point the current in the first energy storage circuit 1012 becomes 0.

[0110] Figure 4 The diagram shows the waveform of the current through the first energy storage circuit 1012 when only one operation 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 is performed during the mutual discharge of the first battery pack 11 and the second battery pack 12, and when only one operation 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 is performed.

[0111] 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 is charging the second battery pack 12, the current in the first energy storage circuit 1012 changes from a positive first current I. up The current gradually decreases because the first battery pack 11 charges the first energy storage circuit 1012 only once during the first processing period. Therefore, the first energy storage circuit 1012 will continuously 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 in the negative first current -I up It varies between 0 and 0.

[0112] It is not difficult to see from the above that, Figure 4 In the case shown, during the first and second processes, the current through the first energy storage circuit 1012 is in the positive first current I. up and the negative first current -I up The changes between them. Figure 3 In the case shown, during the first processing, the current through the first energy storage circuit 1012 is a positive first current I. up and the positive second current I down The current alternates between these states; during the second processing, the current passing through the first energy storage circuit 1012 is in the negative first current -I. up and the negative second current -I down The current changes alternately between these states, and the rate of change of the current through the first energy storage circuit 1012 is much smaller than that of the first energy storage circuit 1012. Figure 4 The rate of change of the current through the first energy storage circuit 1012 in the case shown can be greatly reduced, thereby significantly reducing the current frequency through the first energy storage circuit 1012.

[0113] In the technical solution, the first energy storage circuit 1012 temporarily stores energy. Through the first energy storage circuit 1012, the discharging speed of the first battery pack 11 and the second battery pack 12 can be controlled, so that the discharging amount of the first battery pack 11 and the second battery pack 12 is not too large each time, and the probability of power loss of the first battery pack 11 and the second battery pack 12 is reduced. At the same time, through the switch circuit 1011 and the first energy storage circuit 1012, the first battery pack 11 can discharge to the second battery pack 12 for a small number of times, and the second battery pack 12 can discharge to the first battery pack 11 for a large number of times, so that the time length of mutual discharging of the first battery pack 11 and the second battery pack 12 is long, and the depolarization effect of the first battery pack 11 and the second battery pack 12 is enhanced.

[0114] Reference Figure 5 According to some embodiments of the present application, the negative electrode of the first battery pack 11 and the negative electrode of the second battery pack 12 are connected, the switch circuit 1011 includes: a first bridge arm 20, a first end of the first bridge arm 20 being connected with the positive electrode of the first battery pack 11, and a second end of the first bridge arm 20 being connected with the negative electrode of the first battery pack 11, and a second bridge arm 21, a first end of the second bridge arm 21 being connected with the positive electrode of the second battery pack 12, and a second end of the second bridge arm 21 being connected with the second end of the first bridge arm 20; a first end of the first energy storage circuit 1012 being connected with a midpoint of the first bridge arm 20, and a second end of the first energy storage circuit 1012 being connected with a midpoint of the second bridge arm 21, and the controller 103 is configured to: in response to the voltage of the first battery pack 11 and the second battery pack 12 being less than or equal to a first threshold value, control the charging device 102 to charge the first battery pack 11 and the second battery pack 12; and in response to the voltage of the first battery pack 11 and / or the second battery pack 12 during charging being greater than the first threshold value, control the first battery pack 11 and the second battery pack 12 to mutually discharge through the first bridge arm 20, the second bridge arm 21 and the first energy storage circuit 1012.

[0115] The second end of the second bridge arm 21 is connected with the second end of the first bridge arm 20, that is, connected with the negative electrodes of the first battery pack 11 and the second battery pack 12.

[0116] The positive electrode of the first battery pack 11 and the positive electrode of the second battery pack 12 can be not connected, or the positive electrode of the first battery pack 11 and the positive electrode of the second battery pack 12 can be connected through a switching element for controlling the positive electrode of the first battery pack 11 and the positive electrode of the second battery pack 12 to be disconnected during the mutual discharging of the first battery pack 11 and the second battery pack 12, and to be connected during the charging. In the first bridge arm 20 and the second bridge arm 21, the circuits on both sides of the midpoints can be controlled respectively, 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, so that, during the mutual discharging of the first battery pack 11 and the second battery pack 12, the positive electrode of the first battery pack 11 and the positive electrode of the second battery pack 12 are disconnected, and the first end of the first bridge arm 20 and the second bridge arm 21 are connected respectively, and the second end of the first bridge arm 20 and the second bridge arm 21 are connected to the negative electrode of the first battery pack 11 and the second battery pack 12, by controlling the conduction mode of the circuits on both sides of the midpoints of the first bridge arm 20 and the second bridge arm 21, the first battery pack 11 and the second battery pack 12 can form different discharging circuits with the first energy storage circuit 1012 through the first bridge arm 20 and the second bridge arm 21 respectively.

[0117] Exemplarily, by controlling the first bridge arm 20 and the second bridge arm 21, the first battery pack 11 and the first energy storage circuit 1012 form a circuit to make the first battery pack 11 discharge to the first energy storage circuit 1012, and the first energy storage circuit 1012 stores energy. The second battery pack 12 and the first energy storage circuit 1012 form a circuit through the first bridge arm 20 and the second bridge arm 21 to make the first energy storage circuit 1012 release energy to the second battery pack 12. Similarly, by controlling the first bridge arm 20, the second battery pack 12 and the first energy storage circuit 1012 form a circuit to make the second battery pack 12 discharge to the first energy storage circuit 1012, and the first energy storage circuit 1012 stores energy, and the first battery pack 11 and the first energy storage circuit 1012 form a circuit to make the first energy storage circuit 1012 release energy to the first battery pack 11.

[0118] In some embodiments, during the entire charging process of the battery, the controller can only perform a limited number of operations of controlling the first battery pack 11 and the second battery pack 12 to discharge to each other in response to the voltage of the first battery pack 11 and / or the second battery pack 12 being greater than the first threshold value during charging, so that the battery can be fully charged smoothly. Exemplarily, the controller can only control the first battery pack 11 and the second battery pack 12 to discharge to each other in response to detecting for the first time that the voltage of the first battery pack 11 and / or the second battery pack 12 is greater than the first threshold value during charging of the battery.

[0119] According to the technical solution, the first battery pack 11 and the second battery pack 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 to each other to reduce the voltage of the first battery pack 11 and the second battery pack 12. When the voltage of the first battery pack 11 and / or the second battery pack 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.

[0120] Reference 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 pack 11, and the first lower bridge arm is connected to the negative electrode of the first battery pack 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 pack 12, and the second lower bridge arm is connected to the negative electrode of the second battery pack 12. The controller 103 is configured to alternately perform a first operation and a second operation to cause the first battery pack 11 to discharge to the second battery pack 12.

[0121] 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.

[0122] 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.

[0123] The controller 103 is further configured to alternately perform a third operation and a fourth operation to cause the second battery pack 12 to discharge to the first battery pack 11.

[0124] 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.

[0125] 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.

[0126] The first upper bridge arm includes a first upper bridge arm switch V1, and the first lower bridge arm includes a first lower bridge arm switch V2. The first upper bridge arm can be turned on / off by turning on / off the first upper bridge arm switch V1, and the first lower bridge arm can be turned on / off by turning on / off the first lower bridge arm switch V2. The types of the first upper bridge arm switch V1 and the first lower bridge arm switch V2 include but are not limited to MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) or IGBT (Insulate-Gate Bipolar Transistor) and the like.

[0127] The second upper bridge arm includes a second upper bridge arm switch V3, and the second lower bridge arm includes a second lower bridge arm switch V4. The second upper bridge arm can be turned on or turned off by turning on or turning off the second upper bridge arm switch V3, and the second lower bridge arm can be turned on or turned off by turning on or turning off the second lower bridge arm switch V4. The types of the second upper bridge arm switch V3 and the second lower bridge arm switch V4 include, but are not limited to, MOS tubes or IGBT tubes.

[0128] The controller 103 is configured to first perform a first operation to form a loop including the first battery pack 11, the first upper bridge arm, the first energy storage circuit 1012, and the second lower bridge arm, and then perform a second operation to form a loop including the first battery pack 11, the first upper bridge arm, the first energy storage circuit 1012, the second upper bridge arm, and the second battery pack 12.

[0129] In some embodiments, the first energy storage circuit 1012 is an inductor, as shown in FIG. 1. Figure 6 In FIG. 1, the solid line with an arrow in it shows the current path of the first battery pack 11 discharging to the inductor. Figure 7 In FIG. 1, the solid line with an arrow in it shows the current path of the inductor discharging to the second battery pack 12.

[0130] During the performance of the second operation, the first end of the first energy storage circuit 1012 is connected through the first upper bridge arm and the first battery pack 11, and the second end of the first energy storage circuit 1012 is connected through the second upper bridge arm and the second battery pack 12, so that the voltage of the first battery pack 11 and the first energy storage circuit 1012 in series is greater than the voltage of the second battery pack 12, and the first energy storage circuit 1012 can discharge to the second battery pack 12. In addition, during the charging of the first energy storage circuit 1012 to the second battery pack 12, the first battery pack 11 can continue to discharge to the first energy storage circuit 1012, thereby improving the depolarization effect of the first battery pack 11.

[0131] The controller 103 is configured to first perform a third operation to make the second battery pack 12, the second upper bridge arm, the first energy storage circuit 1012 and the first lower bridge arm form a loop, after the current flows out from the positive electrode of the second battery pack 12, 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 pack 12, the second battery pack 12 discharges to the first energy storage circuit 1012; and then perform a fourth operation to make the first battery pack 11, the first upper bridge arm, the first energy storage circuit 1012, the second upper bridge arm and the second battery pack 12 form a loop, after the current flows out from the first energy storage circuit 1012, flows through the first upper bridge arm, the positive electrode and the negative electrode of the first battery pack 11 and the second battery pack 12 and finally flows back to the first energy storage circuit 1012, the first energy storage circuit 1012 discharges to the first battery pack 11.

[0132] In some embodiments, the first energy storage circuit 1012 is an inductor, such as Figure 8 The solid line with an arrow in it shows the current path of the second battery pack 12 discharging to the inductor, Figure 9 The solid line with an arrow in it shows the current path of the inductor discharging to the first battery pack 11.

[0133] During the performance of the fourth operation, the first end of the first energy storage circuit 1012 is connected through the first upper bridge arm and the first battery pack 11, and the second end of the first energy storage circuit 1012 is connected through the second upper bridge arm and the second battery pack 12, so that the voltage of the second battery pack 12 and the first energy storage circuit 1012 in series is greater than the voltage of the first battery pack 11, so that the first energy storage circuit 1012 can discharge to the first battery pack 11. And in the process of the first energy storage circuit 1012 charging the first battery pack 11, the second battery pack 12 can also continuously discharge to the first energy storage circuit 1012, so as to improve the depolarization effect of the second battery pack 12.

[0134] In some embodiments, the first upper bridge arm switch tube V1 is provided with a first freewheeling diode D1 corresponding thereto, and the first lower bridge arm switch tube V2 is provided with a second freewheeling diode D2 corresponding thereto. In the gap from switching the first operation to the second operation and the gap from switching the second operation to the first operation, the current can be freewheeled from the first freewheeling diode D1. Similarly, in the gap from switching the third operation to the fourth operation, the current can be freewheeled from the second freewheeling diode D2, and in the gap from switching the fourth operation to the third operation, the current can be freewheeled from the first freewheeling diode D1, so that during discharging of the first battery pack and the second battery pack from each other, the current in the inductor is always kept, so that the rate of change of the current through the inductor is small, and the frequency of the current flowing through the inductor is 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 whistling of the motor caused by excessive current flowing through the motor can be greatly improved, and the performance of the motor is stable, so as to improve the depolarization effect of the battery 100.

[0135] 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 voltages of the first battery pack 11 and the second battery pack 12 during charging being greater than the first threshold value, or can alternately perform the first processing and the second processing on the battery 100, in the first processing, the first operation and the second operation are alternately performed N1 times, and in the second processing, the third operation and the fourth operation are alternately performed N2 times.

[0136] In the process of discharging the first energy storage circuit to the second battery pack 12, the first energy storage circuit, the first battery pack 11 and the second battery pack 12 can form a loop, and the first battery pack 11 can continuously discharge to the first energy storage circuit, further improving the depolarization effect of the first battery pack 11. And, it can also make the voltage of the first battery pack 11 and the first energy storage circuit in series greater than the voltage of the second battery pack 12, improve the success rate of the first energy storage circuit discharging to the second battery pack 12 smoothly. Similarly, in the process of discharging the first energy storage circuit to the first battery pack 11, the first energy storage circuit, the first battery pack 11 and the second battery pack 12 can form a loop, and the second battery pack 12 can continuously discharge to the first energy storage circuit, improve the success rate of the first energy storage circuit discharging to the first battery pack 11 smoothly, and improve the depolarization effect of the second battery pack 12.

[0137] Continuing to refer to Figures 6 to 9According to some embodiments of the present application, the battery control circuit further comprises: a first switch K1 connecting the positive pole of the first battery pack 11 and the positive pole of the second battery pack 12; the controller 103 is configured to: 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 value, control the first switch K1 to be closed, and control the charging device 102 to charge the first battery pack 11 and the second battery pack 12; in response to the voltage of the first battery pack 11 and the second battery pack 12 during charging being greater than the first threshold value, control the first switch K1 to be opened, so that the charging device 102 charges the first battery pack 11 or the second battery pack 12, and controls the first battery pack 11 and the second battery pack 12 to discharge to each other through the first bridge arm 20, the second bridge arm 21 and the first energy storage circuit 1012.

[0138] It can be understood that, since the negative pole of the first battery pack 11 and the negative pole of the second battery pack 12 are connected, in the case that the first switch K1 is closed, the positive pole of the first battery pack 11 and the positive pole of the second battery pack 12 are connected, the first battery pack 11 and the second battery pack 12 are connected in parallel. In some embodiments, the first battery pack 11 and the second battery pack 12 can be charged through any one of the first output end and the second output end.

[0139] Exemplarily, the first output end of the charging device 102 can comprise a first positive pole end, the second output end can comprise a second positive pole end, the charging device 102 further comprises a negative pole end, and the first output end and the second output end can share the same negative pole end. In the case that the first switch K1 is closed, any one of the first output end and the second output end can be connected to the battery 100, and the other one can be disconnected from the battery 100.

[0140] In some embodiments, the charging device 102 can further comprise a first charging positive relay K11, a second charging positive relay K21 and a charging negative relay K12. Among them, the first charging positive relay K11 connects the first positive pole end and the positive pole of the first battery pack 11, the second charging positive relay K21 connects the second positive pole end and the positive pole of the second battery pack 12, and the charging negative relay K12 connects the negative pole end and the negative poles of the first battery pack 11 and the second battery pack 12.

[0141] The controller 103 is configured to: in response to the voltage of the first battery pack 11 and the second battery pack 12 during charging being greater than the first threshold value, control the first switch K1 to be opened, and send a message to the charging device 102 to make the first battery pack 11 and the second battery pack 12 discharge to each other, after the charging device 102 receives the message to make the first battery pack 11 and the second battery pack 12 discharge to each other, controls one of the first charging positive relay K11 and the second charging positive relay K21 to be closed, and the other one to be opened, to charge any one of the first battery pack 11 or the second battery pack 12. As an example, Figures 6 to 9The first charging positive relay K11 and the charging negative relay K12 are closed and the second charging positive relay K21 is opened during the discharging of the first battery pack 11 to the second battery pack 12 and the discharging of the second battery pack 12 to the first battery pack 11, as shown in the middle. The dotted line with arrows is a schematic diagram of the current path of the charging device 102 to the first battery pack 11.

[0142] In some embodiments, the first switch K1 can include, but is not limited to, a relay or other element capable of acting as a switch.

[0143] In some embodiments, the battery control circuit further comprises a second switch K2 and a third switch K3. The first end of the second switch K2 is connected to the positive pole of the first battery pack 11, and the second end of the second switch K2 is connected to the first upper bridge arm, for controlling the connection / cutoff between the positive pole of the first battery pack 11 and the first upper bridge arm. The first end of the third switch K3 is connected to the negative pole of the first battery pack 11, and the second end of the third switch K3 is connected to the first lower bridge arm, for controlling the connection / cutoff between the negative pole of the first battery pack 11 and the first lower bridge arm. In this way, when the first battery pack 11 needs to discharge to the second battery pack 12, the connection between the first battery pack 11 and the first bridge arm 20 can be controlled by the second switch K2 and the third switch K3. When the battery 100 does not need the first battery pack 11 to discharge to the second battery pack 12, the first battery pack 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.

[0144] 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 pole of the first battery pack 11 is connected to the negative pole of the second battery pack 12, the second connector 25 is connected to the negative poles of the first battery pack 11 and the second battery pack 12 through the third switch. In one example, the charging negative relay K12 of the charging device 102 can be connected to the second connector 25, so that the negative poles 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 charging negative relay K12.

[0145] In some embodiments, the battery control circuit further comprises a fourth switch K4 connected in parallel with the third switch K3 and a first resistor connected in series with the third switch K3, which functions as a current limiting protection.

[0146] In some embodiments, the battery control circuit further comprises a current sensor 23 connected between the first battery pack 11 and the first bridge arm 20, for example, connected between the positive electrode of the battery 100 and the second switch K2, for detecting the current output by the battery 100, so as to regulate the current in the battery control circuit during discharging of the first battery pack and the second battery pack from each other, to produce a better depolarization effect on the battery 100.

[0147] In some embodiments, the second switch K2, the third switch K3 and the fourth switch K4 can include but are not limited to relays.

[0148] In the above technical solution, during charging, the first switch K1 is closed, so that the first battery pack 11 and the second battery pack 12 are connected in parallel, and then the first battery pack 11 and the second battery pack 12 can be simultaneously charged through any one of the first output end and the second output end, and the voltages of the first battery pack 11 and the second battery pack 12 are consistent, which is conducive to maintaining the energy balance of the first battery pack 11 and the second battery pack 12 during charging, and maintaining the stable performance of the battery 100. When the voltage of any one of the first battery pack 11 and the second battery pack 12 is greater than the first threshold value, the first switch K1 is opened, i.e., the first battery pack and the second battery pack are not in parallel, so that the first battery pack and the second battery pack can form a charging and discharging loop through the first bridge arm 20 and the second bridge arm 21 respectively, and then the depolarization of the battery 100 is realized. That is, by opening and closing the first switch K1, the charging state and the depolarization state of the battery 100 can be switched.

[0149] Reference Figure 10 According to some embodiments of the present application, the two ends of the first battery pack 11 are also connected in parallel with a second energy storage circuit 1013, and the controller 103 is further configured to: during discharging of the first battery pack 11 and the second battery pack 12 from each other, perform N3 times of discharging of the first battery pack 11 to the second energy storage circuit 1013 and discharging of the second energy storage circuit to the second battery pack 12 through the switch circuit 1011, N3 being an integer greater than or equal to 1; and / or during discharging of the first battery pack 11 and the second battery pack 12 from each other, perform N4 times of discharging of the first battery pack 11 to the second energy storage circuit 1013 and discharging of the second energy storage circuit 1013 to the first battery pack 11 through the switch circuit 1011, N4 being an integer greater than or equal to 1.

[0150] Since the two ends of the first bridge arm 20 are connected to the two ends of the first battery pack 11 respectively, the two ends of the second energy storage circuit 1013 are also connected to the two ends of the first bridge arm 20 respectively, and the first bridge arm 20 is connected with the first energy storage circuit 1012, so that the second energy storage circuit 1013 can form a connection with the second battery pack 12 through the first bridge arm 20, the first energy storage circuit 1012 and the second bridge arm 21, thereby being capable of performing discharging of the first battery pack 11 to the second energy storage circuit 1013 and discharging of the second energy storage circuit 1013 to the second battery pack 12, and / or discharging of the first battery pack 11 to the second energy storage circuit 1013 and discharging of the second energy storage circuit 1013 to the first battery pack 11.

[0151] The value of N3 and the value of N4 can be set according to the first threshold value and different types of the battery 100. After performing the operation of discharging the first battery pack 11 to the first energy storage circuit 1012 and discharging the first energy storage circuit 1012 to the second battery pack 12 for N3 times, and / or performing the operation of discharging the first battery pack 11 to the first energy storage circuit 1012 and discharging the first energy storage circuit 1012 to the first battery pack 11 for N4 times, the voltage values of the first battery pack 11 and the second battery pack 12 can 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.

[0152] In some embodiments, the second energy storage circuit 1013 can include, but is not limited to, an element with a charging and discharging function such as an inductor or a capacitor.

[0153] In the above technical solution, the second energy storage circuit 1013 can also realize discharging of the first battery pack 11 to the second battery pack 12, and / or discharging of the second battery pack 12 to the first battery pack 11, thereby improving the depolarization effect on the battery.

[0154] According to some embodiments of the present application, the controller 103 is further configured to, during discharging of the first battery pack 11 to the second battery pack 12, simultaneously perform discharging of the first battery pack 11 to the first energy storage circuit 1012 and discharging of the first battery pack 11 to the second energy storage circuit 1013, and simultaneously perform discharging of the first energy storage circuit 1012 to the second battery pack 12 and discharging of the second energy storage circuit 1013 to the second battery pack 12 through the switching circuit 1011; during discharging of the second battery pack 12 to the first battery pack 11, simultaneously perform discharging of the second battery pack 12 to the first energy storage circuit 1012 and discharging of the first battery pack 11 to the second energy storage circuit 1013, and simultaneously perform discharging of the first energy storage circuit 1012 to the first battery pack 11 and discharging of the second energy storage circuit 1013 to the first battery pack 11 through the switching circuit 1011.

[0155] The second energy storage circuit 1013 is connected in parallel with 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.

[0156] Exemplarily, during the execution of the first operation, so that the first battery pack 11, the first upper bridge arm, the first energy storage circuit 1012 and the second lower bridge arm constitute a loop, the second energy storage circuit 1013 can constitute a loop with the first battery pack 11, the first upper bridge arm, the first energy storage circuit 1012 and the second lower bridge arm, so that the first battery pack 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.

[0157] During the execution of the second operation, so that the first battery pack 11, the first upper bridge arm, the first energy storage circuit 1012, the second upper bridge arm and the second battery pack 12 constitute a loop, the second energy storage circuit 1013 can constitute a loop with the second battery pack 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 pack 12.

[0158] 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.

[0159] During the execution of the third operation, the second battery pack 12, the second upper bridge arm, the first energy storage circuit 1012 and the first lower bridge arm constitute a loop, so that the second battery pack 12 discharges to the first energy storage circuit 1012, the second energy storage circuit 1013 can constitute a loop with the first battery pack 11, so that the first battery pack 11 discharges to the second energy storage circuit 1013, and the second energy storage circuit 1013 stores energy.

[0160] During the execution of the fourth operation, the first battery pack 11, the first upper bridge arm, the first energy storage circuit 1012, the second upper bridge arm and the second battery pack 12 constitute a loop, so that the first energy storage circuit 1012 discharges to the first battery pack 11, the second energy storage circuit 1013 can constitute a loop with the first battery pack 11, and the second energy storage circuit 1013 releases energy to the first battery pack 11.

[0161] That is, during the execution of the third operation and the fourth operation, the second battery pack 12 can discharge to the first battery pack 11 through the first energy storage circuit 1012, and the first battery pack 11 can exchange energy with the second energy storage circuit 1013.

[0162] In the above technical solution, the first battery pack 11 can exchange energy with the second energy storage circuit 1013, which can increase the discharge capacity of the first battery pack 11 in a short time, improve the discharge efficiency of the first battery pack 11, and thus further improve the depolarization effect.

[0163] like Figure 10 As shown, according to some embodiments of this 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 pack and the second battery pack, thereby giving the battery 100 a better depolarization effect.

[0164] In some embodiments, the first energy storage circuit 1012 may include an inductor.

[0165] In other embodiments, the first energy storage circuit 1012 may also include multiple inductors, which may be connected in parallel, in series, or a portion of the inductors may be connected in series with the remaining inductors. The number of first bridge arms 20 may be multiple, and the number of first bridge arms 20 is the same as the number of inductors connected in parallel, with each parallel inductor corresponding to one of the multiple first bridge arms 20.

[0166] For example, the first energy storage circuit 1012 may include three first inductors L1 connected in parallel. There are three first bridge arms 20, with each of the three first inductors L1 connected to one of the three first bridge arms 20. The first end of each first inductor L1 is connected to the midpoint of a first bridge arm 20, and the second end of each first inductor L1 is connected to the midpoint of a second bridge arm 21. The three first inductors L1 can be three-phase windings in a motor, and the bridge arms connected to the first inductors L1 can be three-phase bridge arms. In this way, when charging the vehicle's battery, the existing motor and three-phase bridge arms in the vehicle can be used to depolarize the battery, reducing costs.

[0167] Both capacitors and inductors have charging and discharging functions. The first energy storage circuit 1012 includes at least one inductor, and the second energy storage circuit 1013 includes a capacitor. It can realize the simultaneous discharge of the first battery pack 11 to the inductor and the first battery pack 11 to the capacitor through the switching circuit 1011, the simultaneous discharge of the inductor to the second battery pack 12 and the capacitor to the second battery pack 12, and the simultaneous discharge of the second battery pack 12 to the inductor and the first battery pack 11 to the capacitor through the switching circuit 1011, as well as the simultaneous discharge of the inductor to the first battery pack 11 and the capacitor to the first battery pack 11.

[0168] like Figure 11As shown, the capacitor is connected in parallel with the first battery pack 11, and during the period when the first battery pack 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 pack 11, the first upper bridge arm, the inductor and the second lower bridge arm, so that the first battery pack 11 discharges to the capacitor and the inductor at the same time, that is, the capacitor and the inductor store energy.

[0169] During the period when 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, the capacitor can form a loop with the second battery pack 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 pack 12.

[0170] When the second battery pack 12, the second upper bridge arm, the inductor and the first lower bridge arm form a loop to make the second battery pack 12 discharge to the inductor, the capacitor can form a loop with the first battery pack 11 to make the first battery pack 11 discharge to the capacitor, and the capacitor stores energy.

[0171] When 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 to make the inductor discharge to the first battery pack 11, the capacitor functions as a replacement power supply, and the capacitor releases energy to the first battery pack 11.

[0172] In the above technical solution, the capacitor has a small volume, and the capacitor can realize fast charging and discharging, thereby further improving 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.

[0173] The embodiment of the present application provides a battery system, which comprises the battery control circuit in the above embodiment.

[0174] The embodiment of the present application provides a power utilization device, which comprises the battery system in the above embodiment, and the battery system is used for providing electric energy.

[0175] The battery system comprises the battery 100 connected to the battery control circuit. The battery system has the beneficial effects of the battery control circuit provided by the embodiment of the present application, and specific descriptions can be referred to the specific description of the battery control circuit in the above embodiments, which will not be described herein again.

[0176] The power utilization device can refer to the related description in the above embodiments, which will not be described herein again.

[0177] Combined with reference Figure 1 and Figure 12 The embodiment of the present application provides a battery charging control method, the battery 100 comprises a first battery pack 11 and a second battery pack 12, 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 further connected to a first module 101, the method comprises:

[0178] In step 110, the voltages of the first battery group 11 and the second battery group 12 during the charging of the battery 100 by the charging device 102 are obtained.

[0179] In step 120, in response to the voltage of the first battery group 11 and / or the second battery group 12 being greater than a first threshold value, the first module is controlled to cause the first battery group and the second battery group to discharge to each other; and during the discharging of the first battery group 11 and the second battery group 12 to each other, the charging device 102 is controlled to charge at least one of the first battery group 11 and the second battery group 12.

[0180] The structure of the battery 100, the first module 101, and the charging device 102 can refer to the related descriptions in the above embodiments, and will not be described here again.

[0181] In step 110, the method of obtaining the voltages of the first battery group 11 and the second battery group 12 during the charging can refer to the related descriptions in the above embodiments, and will not be described here again.

[0182] Step 120 can be performed by the controller 103 in the above embodiments, and the setting method of the first threshold value and the method related to step 120 can refer to the related descriptions in the above embodiments, and will not be described here again.

[0183] In the above technical solutions, during the discharging process, the accumulated charges 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 discharging of the first battery group 11 and the second battery group 12 to each other, the charging device 102 maintains charging at least one of the first battery group 11 and the second battery group 12, so that the connection between the charging device 102 and the battery 100 can be maintained. After the discharging of the first battery group 11 and the second battery group 12 to each other ends, the charging device 102 can directly recharge the battery 100 without performing the process of re-interacting the charging device 102 and the battery 100, further shortening the charging time and improving the charging efficiency.

[0184] According to some embodiments of the present application, in step 120, the charging current of the charging device 102 to the first battery group 11 or the second battery group 12 is less than the discharging current of the first battery group 11 to the second battery group 12, and less than the discharging current of the second battery group 12 to the first battery group 11.

[0185] In some embodiments, in step 120, the charging device 102 charges the first battery pack 11, and during the discharging of the first battery pack 11 to the second battery pack 12, the charging current of the charging device 102 to the first battery pack 11 is less than the discharging current of the first battery pack 11 to the second battery pack 12, and during the discharging of the second battery pack 12 to the first battery pack 11, the charging current of the charging device 102 to the first battery pack 11 is less than the discharging current of the second battery pack 12 to the first battery pack 11.

[0186] In other embodiments, in step 120, the charging device 102 charges the second battery pack 12, and during the discharging of the first battery pack 11 to the second battery pack 12, the charging current of the charging device 102 to the second battery pack 12 is less than the discharging current of the first battery pack 11 to the second battery pack 12, and during the discharging of the second battery pack 12 to the first battery pack 11, the charging current of the charging device 102 to the second battery pack 12 is less than the discharging current of the second battery pack 12 to the first battery pack 11.

[0187] In yet other embodiments, during the discharging of the first battery pack 11 to the second battery pack 12, the charging device 102 charges the first battery pack 11, and the charging current of the charging device 102 to the first battery pack 11 is less than the discharging current of the first battery pack 11 to the second battery pack 12. During the discharging of the second battery pack 12 to the first battery pack 11, the charging device 102 charges the second battery pack 12, and the charging current of the charging device 102 to the second battery pack 12 is less than the discharging current of the second battery pack 12 to the first battery pack 11.

[0188] It can be understood that the greater the charging current of the battery 100, the faster the accumulation of charges on the electrodes of the battery 100, and the greater the discharging current of the battery 100, the faster the release of charges on the electrodes of the battery 100. In the case of the same current size, the speed of the release of charges during the discharging of the battery 100 is greater than the accumulation speed of charges during the charging of the battery 100. By setting the charging current of the charging device 102 to the first battery pack 11 or the second battery pack 12 to be less than the discharging current of the first battery pack 11, the accumulation speed of charges of the first battery pack 11 or the second battery pack 12 is further reduced compared to the release speed of charges during the discharging of the first battery pack 11 and the second battery pack 12 to each other.

[0189] In the above technical solution, the charging current of the charging device 102 to the first battery pack 11 or the second battery pack 12 is set to be less than the discharging current of the first battery pack 11. This can, to a certain extent, ensure that the amount of charge accumulated on the electrodes of the first battery pack 11 or the second battery pack 12 when the charging device 102 charges the first battery pack 11 or the second battery pack 12 is less than the amount of charge released by the first battery pack 11 and the second battery pack 12 during the discharge process. This results in the first battery pack 11 and the second battery pack 12 having a better depolarization effect and improving the depolarization phenomenon of the battery 100.

[0190] It is understandable that, since the rate at which the charge is released when the battery 100 is discharging is greater than the rate at which the charge is accumulating when the battery 100 is charging, in other embodiments, in step 120, the charging current of the charging device 102 to the first battery pack 11 or the second battery pack 12 can also be controlled to be greater than or equal to the discharge current of the first battery pack 11 to the second battery pack 12, and / or greater than or equal to the discharge current of the second battery pack 12 to the first battery pack 11.

[0191] According to some embodiments of this application, during the mutual discharge of the first battery pack 11 and the second battery pack 12, controlling the charging device 102 to charge at least one of the first battery pack 11 and the second battery pack 12 includes: during the mutual discharge of the first battery pack 11 and the second battery pack 12, controlling the charging device 102 to charge one of the first battery pack 11 or the second battery pack 12.

[0192] The method for controlling the charging device 102 to charge one of the first battery pack 11 or the second battery pack 12 can be referred to the relevant description in the above embodiments, and will not be repeated below.

[0193] In the above technical solution, the first battery pack 11 or the second battery pack 12 that is not charged by the charging device 102 during the mutual discharge of the first battery pack 11 and the second battery pack 12 will not experience continuous charge accumulation due to being charged, thus ensuring a good depolarization effect to a certain extent. In this way, while maintaining the connection between the charging device 102 and the battery 100, the depolarization effect of the battery 100 can be better improved.

[0194] According to some embodiments of this application, step 120 includes performing a first process on the battery, the first process including: discharging the first battery pack 11 to the second battery pack 12 through the first module 101.

[0195] During the mutual discharge between the first battery pack 11 and the second battery pack 12, controlling the charging device 102 to charge at least one of the first battery pack 11 and the second battery pack 12 includes: in a first process, controlling the charging device 102 to charge the first battery pack 11.

[0196] In the first processing, the method for controlling the charging device 102 to charge the first battery pack 11 can refer to the related description in the above embodiments, and will not be described here.

[0197] In the above technical solution, the problem that the first battery pack is discharged too fast to cause power loss can be avoided to some extent, which is beneficial to maintain the normal performance of the first battery pack, so as to improve the charging efficiency.

[0198] According to some embodiments of the present application, the step 120 comprises performing a second processing on the battery, and the second processing comprises: performing, by the first module 101, discharging of the second battery pack 12 to the first battery pack 11.

[0199] During the mutual discharging of the first battery pack 11 and the second battery pack 12, the method for controlling the charging device 102 to charge at least one of the first battery pack 11 and the second battery pack 12 comprises: in the second processing, controlling the charging device 102 to charge the second battery pack 12.

[0200] In the second processing, the method for controlling the charging device 102 to charge the second battery pack 12 can refer to the related description in the above embodiments, and will not be described here.

[0201] In the above technical solution, the problem that the second battery pack 12 is discharged too fast to cause power loss can be avoided to some extent, which is beneficial to maintain the normal performance of the second battery pack 12, so as to improve the charging efficiency.

[0202] Reference Figure 2 According to some embodiments of the present application, the negative electrode of the first battery pack 11 and the negative electrode of the second battery pack 12 are connected, and the first module 101 comprises: 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.

[0203] The first module 101 is controlled to make the first battery pack 11 and the second battery pack 12 mutually discharge, comprising: performing, by the switching circuit 1011, N1 times of discharging of the first battery pack 11 to the first energy storage circuit 1012 and discharging of the first energy storage circuit 1012 to the second battery pack 12, so that the first battery pack 11 discharges to the second battery pack 12, N1 is an integer greater than or equal to 1.

[0204] The first module 101 is controlled to make the first battery pack 11 and the second battery pack 12 mutually discharge, further comprising: performing, by the switching circuit 1011, N2 times of discharging of the second battery pack 12 to the first energy storage circuit 1012 and discharging of the first energy storage circuit 1012 to the first battery pack 11, so that the second battery pack 12 discharges to the first battery pack 11, N2 is an integer greater than or equal to 1.

[0205] The connection mode of the first battery pack 11 and the second battery pack 12, and the structure and connection mode of the switching circuit 1011 and the first energy storage circuit 1012 with the first battery pack 11 and the second battery pack 12 can refer to the related description in the above embodiments, and will not be repeated hereinafter.

[0206] The specific method and principle of discharging from the first battery pack 11 to the second battery pack 12 and discharging from the second battery pack 12 to the first battery pack 11 in the above technical solution can refer to the related description in the above embodiments, and will not be repeated hereinafter.

[0207] In the above technical solution, the first energy storage circuit 1012 plays a role of temporarily storing energy. Through the first energy storage circuit 1012, the discharging speed of the first battery pack 11 and the second battery pack 12 can be controlled, so that the discharging amount of the first battery pack 11 and the second battery pack 12 each time is not too much, and the probability of the first battery pack 11 and the second battery pack 12 being depleted is reduced. At the same time, through the switching circuit 1011 and the first energy storage circuit 1012, the first battery pack 11 can be discharged to the second battery pack 12 multiple times, and the second battery pack 12 can be discharged to the first battery pack 11 multiple times, so that the time length of discharging the first battery pack 11 and the second battery pack 12 to each other is longer, and the depolarization effect of the first battery pack 11 and the second battery pack 12 is enhanced.

[0208] In combination with reference Figure 5 and Figure 13 According to some embodiments of the present application, the switching circuit 1011 includes: a first bridge arm 20 and a second bridge arm 21, a first end of the first bridge arm 20 is connected with the positive electrode of the first battery pack 11, a second end is connected with the negative electrode of the first battery pack 11, a first end of the second bridge arm 21 is connected with the positive electrode of the second battery pack 12, and a second end is connected with the second end of the first bridge arm 20; a first end of the first energy storage circuit 1012 is connected with the midpoint of the first bridge arm 20, and a second end is connected with the midpoint of the second bridge arm 21. The method further includes:

[0209] Step 130, 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 value, controlling the charging device 102 to charge the first battery pack 11 and the second battery pack 12.

[0210] Step 120 includes: in response to the voltage of the first battery pack 11 and / or the second battery pack 12 during charging being greater than the first threshold value, controlling the first battery pack 11 and the second battery pack 12 to discharge to each other through the first bridge arm 20, the second bridge arm 21 and the first energy storage circuit 1012; wherein, during the discharging of the first battery pack 11 and the second battery pack 12 to each other, controlling the charging device 102 to charge at least one of the first battery pack 11 and the second battery pack 12.

[0211] The structure of the first bridge arm 20 and the second bridge arm 21 and the connection mode between the first battery pack 11 and the second battery pack 12 can refer to the related description in the above embodiments, and will not be described hereinafter.

[0212] The specific method of performing steps 120 and 130 through the first bridge arm 20, the second bridge arm 21 and the first energy storage circuit 1012 can refer to the related description in the above embodiments, and will not be described hereinafter.

[0213] It is worth noting that step 130 can be performed before step 120. During the execution of step 130, the voltages of the first battery pack 11 and the second battery pack 12 are obtained, and step 120 is performed in response to the voltages of the first battery pack 11 and the second battery pack 12 being greater than the first threshold. After step 120 ends, the voltages of the first battery pack 11 and the second battery pack 12 are both less than or equal to the first threshold, then step 130 is performed again, the battery 100 enters the charging state again, and the battery 100 can be charged with a large current. During the entire charging process of the battery, the operation of controlling the first battery pack 11 and the second battery pack 12 to discharge to each other in response to the voltage of the first battery pack 11 and / or the second battery pack 12 being greater than the first threshold during charging can be performed only a limited number of times, so that the battery can be successfully charged to full capacity.

[0214] For example, the controller can control the first battery pack 11 and the second battery pack 12 to discharge to 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.

[0215] It is worth noting that in step 120, the step of discharging the first battery pack 11 to the second battery pack 12 and the step of discharging the second battery pack 12 to the first battery pack 11 can be alternately performed. That is, the first process and the second process are alternately performed, in the first process, the operation of discharging the first battery pack to the first energy storage circuit and discharging the first energy storage circuit to the second battery pack is performed N1 times. In the second process, the operation of discharging the second battery pack to the first energy storage circuit and discharging the first energy storage circuit to the first battery pack is performed N2 times. Wherein, the number of alternations, and the values of N1 and N2 can be set in advance according to different batteries 100 and the first threshold, so that after step 120 ends, the voltages of the first battery pack 11 and the second battery pack 12 can be less than or equal to the first threshold. When the controller 103 detects that the voltages of the first battery pack 11 and the second battery pack 12 are greater than the first threshold, the first battery pack 11 and the second battery pack 12 are discharged to each other according to the pre-set rule.

[0216] In the technical solution, the first energy storage circuit 1012 can form a loop with the first battery pack 11 and the second battery pack 12 through the first bridge arm 20 and the second bridge arm 21, so that the first battery pack 11 and the second battery pack 12 can discharge to each other through the first energy storage circuit 1012 to reduce the voltage of the first battery pack 11 and the second battery pack 12, and the charging device 102 can control a large current to charge the battery 100 when the voltage of the first battery pack 11 and / or the second battery pack 12 is less than or equal to the first threshold value.

[0217] Reference 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 pack 11, and the first lower bridge arm is connected to the negative electrode of the first battery pack 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 pack 12, and the second lower bridge arm is connected to the negative electrode of the second battery pack 12.

[0218] The discharging of the first battery pack 11 to the second battery pack 12 includes alternately performing a first operation and a second operation.

[0219] 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.

[0220] The discharging of the second battery pack 12 to the first battery pack 11 includes alternately performing a third operation and a fourth operation.

[0221] 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.

[0222] The structure 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 mode between the first battery pack 11 and the second battery pack 12 can be referred to the related description in the above embodiments, which will not be described here.

[0223] The specific method and principle of performing the first operation and the second operation to make the first battery pack 11 discharge to the second battery pack 12, and the specific method and principle of performing the third operation and the fourth operation to make the second battery pack 12 discharge to the first battery pack 11 can be referred to the related description in the above embodiments, which will not be described here.

[0224] In the above technical solution, during discharging of the first energy storage circuit 1012 to the second battery pack 12, the first energy storage circuit 1012, the first battery pack 11 and the second battery pack 12 can form a loop, and the first battery pack 11 can continuously discharge to the first energy storage circuit 1012, thereby further improving the depolarization effect on the first battery pack 11. Similarly, during discharging of the first energy storage circuit 1012 to the first battery pack 11, the first energy storage circuit 1012, the first battery pack 11 and the second battery pack 12 can form a loop, and the second battery pack 12 can continuously discharge to the first energy storage circuit 1012, thereby improving the depolarization effect on the second battery pack 12.

[0225] 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 through the first switch K1.

[0226] 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 value, controlling the first switch K1 to be closed, and controlling the charging device 102 to charge the first battery pack 11 and the second battery pack 12.

[0227] Step 120 includes: in response to the voltage of the first battery pack 11 and the second battery pack 12 during charging being greater than the first threshold value, controlling the first switch K1 to be opened; controlling the charging device 102 to charge the first battery pack 11 or the second battery pack 12, and controlling the first battery pack 11 and the second battery pack 12 to discharge to each other through the first bridge arm 20, the second bridge arm 21 and the first energy storage circuit 1012.

[0228] For the case where the positive electrode of the first battery pack 11 and the positive electrode of the second battery pack 12 are connected through the first switch K1, the method of performing step 130 and step 120 can refer to the related description in the above embodiments, which will not be repeated here.

[0229] In the above technical solution, by opening and closing the first switch K1, the charging state and the depolarization state of the battery 100 can be switched.

[0230] According to some embodiments of the present application, in the case where the charging device 102 is controlled to charge the first battery pack 11 during discharging of the first battery pack 11 to the second battery pack 12, the discharging of the first battery pack 11 to the second battery pack 12 further includes: controlling the sum of the charging current of the first battery pack 11 and the discharging current of the first battery pack 11 to be equal to the discharging current of the first energy storage circuit 1012 to the second battery pack 12; and the discharging of the second battery pack 12 to the first battery pack 11 further includes: controlling the sum of the charging current of the first battery pack 11 and the discharging current of the first energy storage circuit 1012 to the first battery pack 11 to be equal to the discharging current of the second battery pack 12.

[0231] Or, during the discharging of the first battery pack 11 and the second battery pack 12, when the charging device 102 is controlled to charge the second battery pack 12, the discharging of the first battery pack 11 to the second battery pack 12 further includes that the sum of the charging current of the second battery pack 12 controlled by the charging device 102 and the discharging current of the first battery pack 11 to the second battery pack 12 is equal to the discharging current of the first battery pack 11; and the discharging of the second battery pack 12 to the first battery pack 11 further includes that the sum of the charging current of the second battery pack 12 controlled by the charging device 102 and the discharging current of the second battery pack 12 is equal to the sum of the discharging current of the first battery pack 11 to the second battery pack 12 and the discharging current of the second battery pack 12 to the first battery pack 11.

[0232] In some embodiments, the switching 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 and a first lower bridge arm switch, and the second bridge arm 21 includes a second upper bridge arm switch and a second lower bridge arm switch. It can be understood that, since the conduction current of the switch can be controlled by the voltage applied to the control end of the switch, during the discharging of the first battery pack 11 and the second battery pack 12, the discharging current of the first battery pack 11, the second battery pack 12 and the first energy storage circuit 1012 can be controlled by controlling the size of the conduction current flowing through the first upper bridge arm switch, the first lower bridge arm switch, the second upper bridge arm switch and the second lower bridge arm switch, so as to achieve the above purpose.

[0233] In the above technical solution, during the discharging of the first battery pack 11 and the second battery pack 12, the voltages of the first battery pack 11 and the second battery pack 12 are as close as possible, which is beneficial to maintaining the stability of the first battery pack 11 and the second battery pack 12 when the charging of the battery 100 continues after the discharging of the first battery pack 11 and the second battery pack 12 ends.

[0234] Reference Figure 10 And Figure 11 According to some embodiments of the present application, the first battery pack 11 is further connected in parallel with a second energy storage circuit 1013, and the method further includes: during the discharging of the first battery pack 11 and the second battery pack 12, performing N3 times of discharging of the first battery pack 11 to the second energy storage circuit 1013 and discharging of the second energy storage circuit 1013 to the second battery pack 12 through the switching circuit 1011, N3 being an integer greater than or equal to 1; and / or during the discharging of the first battery pack 11 and the second battery pack 12, performing N4 times of discharging of the first battery pack 11 to the second energy storage circuit 1013 and discharging of the second energy storage circuit 1013 to the first battery pack 11 through the switching circuit 1011, N4 being an integer greater than or equal to 1.

[0235] The structure of the second energy storage circuit 1013 and the method of discharging the first battery pack 11 to the second energy storage circuit 1013 and discharging the second energy storage circuit 1013 to the second battery pack 12 by the switching circuit 1011 N3 times and discharging the first battery pack 11 to the second energy storage circuit 1013 and discharging the second energy storage circuit 1013 to the first battery pack 11 by the switching circuit 1011 N4 times can refer to the related description in the above embodiments, and will not be repeated here.

[0236] In the above technical solution, the second energy storage circuit 1013 can also realize the discharge of the first battery pack 11 to the second battery pack 12 and / or the discharge of the second battery pack 12 to the first battery pack 11, thereby improving the depolarization effect on the battery.

[0237] According to some embodiments of the present application, during the discharge of the first battery pack 11 to the second battery pack 12, the switching circuit 1011 is used to simultaneously perform the discharge of the first battery pack 11 to the first energy storage circuit 1012 and the discharge of the first battery pack 11 to the second energy storage circuit 1013, and simultaneously perform the discharge of the first energy storage circuit 1012 to the second battery pack 12 and the discharge of the second energy storage circuit 1013 to the second battery pack 12.

[0238] During the discharge of the second battery pack 12 to the first battery pack 11, the switching circuit 1011 is used to simultaneously perform the discharge of the second battery pack 12 to the first energy storage circuit 1012 and the discharge of the first battery pack 11 to the second energy storage circuit 1013, and simultaneously perform the discharge of the first energy storage circuit 1012 to the first battery pack 11 and the discharge of the second energy storage circuit 1013 to the first battery pack 11.

[0239] For example, 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 related description in the above embodiments, and will not be repeated here.

[0240] In the above technical solution, the first battery pack 11 can exchange energy with the second energy storage circuit 1013, which can increase the discharge amount of the first battery pack 11 in a short time and improve the discharge efficiency of the first battery pack 11, thereby further improving the depolarization effect.

[0241] The embodiments of the present application provide a battery control circuit, which can refer 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 and the negative electrode of the second battery pack 12 are connected. The positive electrode and the 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 the 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.

[0242] The control circuit comprises a first switch K1 connected to the positive poles of the first battery pack 11 and the second battery pack 12. The control circuit further comprises a first bridge arm 20 having a first end connected to the positive pole of the first battery pack 11 and a second end connected to the negative pole of the first battery pack 11, and a second bridge arm 21 having a first end connected to the positive pole of the second battery pack 12 and a second end connected to the second end of the first bridge arm 20; a first energy storage circuit 1012 having a first end connected to the midpoint of the first bridge arm 20 and a second end connected to the midpoint of the second bridge arm 21; and a controller 103 configured to: in response to the voltages of the first battery pack 11 and the second battery pack 12 being less than or equal to a first threshold value, control the first switch K1, a charging negative relay K12 to be closed, and any one of a first charging positive relay K11 and a second charging positive relay K21 to be closed, and control a charging device 102 to charge the first battery pack 11 and the second battery pack 12 connected in parallel; and in response to the voltage of the first battery pack 11 and / or the second battery pack 12 during charging being greater than the first threshold value, control the first switch K1 to be opened, any one of the first charging positive relay K11 and the second charging relay to be closed, and the charging negative relay K12 to be closed, and alternately perform a first process and a second process on the battery 100 through the first bridge arm 20, the second bridge arm 21 and the first energy storage circuit 1012.

[0243] After the first battery pack 11 and the second battery pack 12 are discharged to each other, the controller 103 controls the first switch K1, the charging negative relay K12 to be closed, and one of the first charging positive relay K11 and the second charging positive relay K21 to be closed, and the other of the first charging positive relay K11 and the second charging positive relay K21 to be opened, so that the charging device 102 continues to charge the battery 100 until the battery 100 is fully charged.

[0244] The first bridge arm 20 comprises a first upper bridge arm connected to the positive pole of the first battery pack 11 and a first lower bridge arm connected to the negative pole of the first battery pack 11, and the second bridge arm 21 comprises a second upper bridge arm connected to the positive pole of the second battery pack 12 and a second lower bridge arm connected to the negative pole of the second battery pack 12. The controller 103 is configured to: alternately perform a first operation and a second operation to perform a first processing on the battery 100, the first operation comprising 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 comprising 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; and alternately perform a third operation and a fourth operation to perform a second processing on the battery 100, the third operation comprising 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 comprising 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 processing and the second processing can refer to the related descriptions in the above embodiments, which will not be repeated here.

[0245] The first energy storage circuit 1012 comprises at least one inductor, and a capacitor is further connected in parallel across the first battery pack 11.

[0246] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; 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 be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery control circuit, characterized by comprising: Comprising: a first module connected to the battery, the battery comprising a first battery pack and a second battery pack, the first battery pack and the second battery pack being respectively connected to an external charging device, the first module comprising a switching circuit connected to the battery and a first energy storage circuit connected to the switching circuit and the battery through the switching circuit; a controller configured to: obtain voltages of the first battery pack and the second battery pack during charging of the battery by the charging device, and in response to the voltage of the first battery pack and / or the second battery pack being greater than a first threshold, control the first module to discharge the first battery pack and the second battery pack to each other, during discharging of the first battery pack and the second battery pack to each other, the first battery pack and the second battery pack exchange energy; the controller is further configured to: during discharging of the first battery pack and the second battery pack to each other, control the charging device to charge at least one of the first battery pack and the second battery pack; wherein, during discharging of the first battery pack and the second battery pack to each other, the controller performs a first process and a second process on the battery, the first process comprising: discharging the first battery pack to the second battery pack through the switching circuit and the first energy storage circuit, wherein during the first process, the charging device is controlled to charge the first battery pack; the second process comprising: discharging the second battery pack to the first battery pack through the switching circuit and the first energy storage circuit, wherein during the second process, the charging device is controlled to charge the second battery pack.

2. The battery control circuit of claim 1, wherein the controller is configured to: during discharging of the first battery pack and the second battery pack to each other, perform N1 times of discharging the first battery pack to the first energy storage circuit and discharging the first energy storage circuit to the second battery pack through the switching circuit, so that the first battery pack discharges to the second battery pack, N1 being an integer greater than or equal to 1; and perform N2 times of discharging the second battery pack to the first energy storage circuit and discharging the first energy storage circuit to the first battery pack through the switching circuit, so that the second battery pack discharges to the first battery pack, N2 being an integer greater than or equal to 1.

3. The battery control circuit of claim 2, wherein, a negative electrode of the first battery pack and a negative electrode of the second battery pack are connected, the switching circuit comprising: a first bridge arm, a first end of the first bridge arm being connected to a positive electrode of the first battery pack, a second end of the first bridge arm being connected to the negative electrode of the first battery pack, and a second bridge arm, a first end of the second bridge arm being connected to a positive electrode of the second battery pack, a second end of the second bridge arm being connected to the second end of the first bridge arm; a first end of the first energy storage circuit being connected to a midpoint of the first bridge arm, a second end of the first energy storage circuit being connected to a midpoint of the second bridge arm, the controller being configured to: in response to the voltages of the first battery pack and the second battery pack being less than or equal to a first threshold value, controlling the charging device to charge the first battery pack and the second battery pack; in response to the voltages of the first battery pack and / or the second battery pack during charging being greater than the first threshold value, controlling the first battery pack and the second battery pack to discharge to each other through the first bridge arm, the second bridge arm and the first snubber circuit.

4. The battery control circuit according to claim 3, wherein the first bridge arm comprises a first upper bridge arm connected to a positive electrode of the first battery pack and a first lower bridge arm connected to a negative electrode of the first battery pack, the second bridge arm comprises a second upper bridge arm connected to a positive electrode of the second battery pack and a second lower bridge arm connected to a negative electrode of the second battery pack, the controller is configured to: alternately perform a first operation and a second operation to cause the first battery pack to discharge to the second battery pack, the first operation comprises 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 comprises 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 a third operation and a fourth operation to cause the second battery pack to discharge to the first battery pack, the third operation comprises 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 comprises controlling the first upper bridge arm and the second upper bridge arm to be turned on and the first lower bridge arm and the second lower bridge arm to be turned off.

5. The battery control circuit of claim 3, wherein, The battery control circuit further comprises: a first switch connected to a positive electrode of the first battery pack and a positive electrode of the second battery pack; the controller is configured to: in response to the voltages of the first battery pack and the second battery pack being less than or equal to a first threshold value, controlling the first switch to be turned on and controlling the charging device to charge the first battery pack and the second battery pack; in response to the voltages of the first battery pack and the second battery pack during charging being greater than the first threshold value, controlling the first switch to be turned off to cause the charging device to charge the first battery pack or the second battery pack and to control the first battery pack and the second battery pack to discharge to each other through the first bridge arm, the second bridge arm and the first snubber circuit.

6. The battery control circuit of claim 3, wherein, the first battery pack is further connected in parallel with a second snubber circuit, and the controller is further configured to: during the discharging of the first battery pack to the second battery pack and the discharging of the second snubber circuit to the second battery pack through the switch circuit, performing N3 times of the discharging of the first battery pack to the second snubber circuit and the discharging of the second snubber circuit to the second battery pack, N3 being an integer greater than or equal to 1; and / or During the discharging of the first battery pack and the second battery pack to each other, the first battery pack is discharged to the second energy storage circuit and the second energy storage circuit is discharged to the first battery pack through the switch circuit N4 times, N4 being an integer greater than or equal to 1.

7. The battery control circuit of claim 6, wherein, The controller is further configured to: During the discharging of the first battery pack to the second battery pack, the first battery pack is discharged to the first energy storage circuit and the first battery pack is discharged to the second energy storage circuit, and the first energy storage circuit is discharged to the second battery pack and the second energy storage circuit is discharged to the second battery pack simultaneously through the switch circuit. During the discharging of the second battery pack to the first battery pack, the second battery pack is discharged to the first energy storage circuit and the first battery pack is discharged to the second energy storage circuit, and the first energy storage circuit is discharged to the first battery pack and the second energy storage circuit is discharged to the first battery pack simultaneously through the switch circuit.

8. The battery control circuit of claim 7, wherein, The first energy storage circuit comprises at least one inductor, and the second energy storage circuit comprises at least one capacitor.

9. A battery system characterized by, The battery control circuit of any one of claims 1-8 is included.

10. An electrical device, characterized by The battery system of claim 9 supplies power to the power consuming device.

11. A battery charge control method characterized by, 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 further comprises a first module, the first module comprises 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 and connected to the battery through the switch circuit, and the method comprises: obtaining the voltages of the first battery pack and the second battery pack during the charging of the battery by the charging device; in response to the voltage of the first battery pack and / or the second battery pack being greater than a first threshold value, controlling the first module to discharge the first battery pack and the second battery pack to each other, and during the discharging of the first battery pack and the second battery pack to each other, the first battery pack and the second battery pack exchange energy; wherein during the discharging of the first battery pack and the second battery pack to each other, the charging device charges at least one of the first battery pack and the second battery pack; wherein discharging the first battery pack and the second battery pack to each other comprises performing a first process and a second process on the battery, the first process comprises: discharging the first battery pack to the second battery pack through the switch circuit and the first energy storage circuit, and during the first process, the charging device charges the first battery pack; the second process comprises: discharging the second battery pack to the first battery pack through the switch circuit and the first energy storage circuit, and during the second process, the charging device charges the second battery pack.

12. The method of claim 11, wherein, During the discharging of the first battery pack and the second battery pack to each other, the charging device is controlled to have a charging current to the first battery pack or the second battery pack less than a discharging current of the first battery pack to the second battery pack and less than a discharging current of the second battery pack to the first battery pack.

13. The method according to claim 11 or 12, characterized in that, The negative electrode of the first battery pack and the negative electrode of the second battery pack are connected; The control of the first module to make the first battery pack and the second battery pack discharge to each other includes: The first battery pack discharges to the second battery pack through the switching circuit by performing the operation of the first battery pack discharging to the first energy storage circuit and the first energy storage circuit discharging to the second battery pack N1 times, where N1 is an integer greater than or equal to 1. The second battery pack discharges to the first battery pack through the switching circuit by performing the operation of the second battery pack discharging to the first energy storage circuit and the first energy storage circuit discharging to the first battery pack N2 times, where N2 is an integer greater than or equal to 1.

14. The method of claim 13, wherein, The switching circuit includes a first bridge arm and a second bridge arm, a first end of the first bridge arm is connected to the positive electrode of the first battery pack, a second end is connected to the negative electrode of the first battery pack, a first end of the second bridge arm is connected to the positive electrode of the second battery pack, and a second end is connected to the second end of the first bridge arm; a first end of the first energy storage circuit is connected to a midpoint of the first bridge arm, and a second end is connected to a midpoint of the second bridge arm, and the method further includes: In response to the voltages of the first battery pack and the second battery pack being less than or equal to a first threshold value, the charging device is controlled to charge the first battery pack and the second battery pack; wherein The control of the first module to make the first battery pack and the second battery pack discharge to each other in response to the voltage of the first battery pack and / or the second battery pack being greater than a first threshold value includes: In response to the voltage of the first battery pack and / or the second battery pack during charging being greater than a first threshold value, the first battery pack and the second battery pack are controlled to discharge to each other through the first bridge arm, the second bridge arm and the first energy storage circuit.

15. The method of claim 14, wherein, 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 discharging of the first battery pack to the second battery pack 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, 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.

16. The method of claim 14, wherein, The positive electrode of the first battery pack and the positive electrode of the second battery pack are connected through a first switch, The control of the charging device to charge the first battery pack and the second battery pack in response to the voltages of the first battery pack and the second battery pack being less than or equal to a first threshold value includes: controlling the first switch to be turned on, and controlling the charging device to charge the first battery pack and the second battery pack; The control of the first module to discharge the first battery pack and the second battery pack from each other in response to the voltage of the first battery pack and / or the second battery pack being greater than a first threshold value includes: controlling the first switch to be turned off in response to the voltages of the first battery pack and the second battery pack during charging being greater than a first threshold value; controlling the charging device to charge the first battery pack or the second battery pack, and controlling the first battery pack and the second battery pack to discharge from each other through the first bridge arm, the second bridge arm, and the first energy storage circuit.

17. The method of claim 13, wherein, In the case of controlling the charging device to charge the first battery pack during the discharging of the first battery pack and the second battery pack from each other, The discharging of the first battery pack to the second battery pack further includes: controlling the sum of the charging current of 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 by the charging device; In the case of controlling the charging device to charge the second battery pack during the discharging of the first battery pack and the second battery pack from each other, The discharging of the second battery pack to the first battery pack further includes: controlling the sum of the charging current of the second battery pack and the discharging current of the second battery pack to be equal to the discharging current of the first energy storage circuit to the first battery pack by the charging device.

18. The method of claim 14, wherein, The first battery pack is also connected in parallel with a second energy storage circuit at both ends, and the method further includes: During the discharging of the first battery pack and the second battery pack from each other, the first battery pack is discharged to the second energy storage circuit and the second energy storage circuit is discharged to the second battery pack through the switch circuit N3 times, N3 being an integer greater than or equal to 1; and / or During the discharging of the first battery pack and the second battery pack from each other, the first battery pack is discharged to the second energy storage circuit and the second energy storage circuit is discharged to the first battery pack through the switch circuit N4 times, N4 being an integer greater than or equal to 1.

19. The method of claim 18, wherein, during the discharging of the first battery bank to the second battery bank further comprises, through the switching circuit, simultaneously performing the discharging of the first battery bank to the first energy storage circuit and the discharging of the first battery bank to the second energy storage circuit, and simultaneously performing the discharging of the first energy storage circuit to the second battery bank and the discharging of the second energy storage circuit to the second battery bank; during the discharging of the second battery bank to the first battery bank further comprises, through the switching circuit, simultaneously performing the discharging of the second battery bank to the first energy storage circuit and the discharging of the first battery bank to the second energy storage circuit, and simultaneously performing the discharging of the first energy storage circuit to the first battery bank and the discharging of the second energy storage circuit to the first battery bank.

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