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

Abstract

The present application belongs to the technical field of batteries, and provides a battery control circuit, a battery system, an electrical device, and a battery charging control method. The control circuit comprises: a first module connected to a battery, the battery comprising a first battery pack and a second battery pack, and the first battery pack and the second battery pack being separately connected to an external charging device; and a controller, configured to: acquire 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 voltage of the second battery pack being greater than a first threshold, control the first module such that the first battery pack and the second battery pack discharge to each other. The controller is further configured to: during the mutual discharge between the first battery pack and the second battery pack, control the charging device to charge at least one of the first battery pack and the second battery pack. The control circuit of the present application can improve the charging efficiency of a battery.

Description

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

[0001] Cross-references

[0002] This application incorporates Chinese Patent Application No. 202510075013.3, filed on January 17, 2025, entitled “Battery Control Circuit, Battery System, Electrical Device and Battery Charging Control Method”, which is incorporated herein by reference in its entirety. Technical Field

[0003] This application relates to the field of battery technology, and in particular to a battery control circuit, a battery system, an electrical device, and a battery charging control method. Background Technology

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0005] During charging or discharging, polarization can occur due to internal chemical reactions and current flow. This polarization can lead to a decrease in battery energy density, longer charging time, and reduced charging efficiency. Summary of the Invention

[0006] This application aims to at least address one of the technical problems existing in the prior art. Therefore, one objective of this application is to provide a battery control circuit, a battery system, an electrical device, and a battery charging control method to solve the problem of low battery charging efficiency in the related art.

[0007] An embodiment of the first aspect of this application provides a battery control circuit, including: a first module connected to a battery, the battery including 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: 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, 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 mutual discharge of the first battery pack and the second battery pack.

[0008] In the technical solution of this application embodiment, when the voltage of the first battery pack and / or the second battery pack is greater than a first threshold, 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 relatively severe. Based on this, by controlling the first module, the first battery pack and the second battery pack discharge to each other to depolarize the batteries. During the discharge process, the charge accumulated on the electrodes of the first battery pack and the second battery pack can be rapidly reduced, the polarization voltage can be lowered, and the polarization phenomenon can be improved. The charging device can charge the depolarized first battery pack and / or the second battery pack with a large current, thereby improving the charging efficiency of the batteries. Since the first battery pack and the second battery pack exchange energy, the charge of the first battery pack and the second battery pack will not decrease or will decrease very little after depolarization, thereby ensuring to a certain extent that the time for recharging the first battery pack and the second battery pack after depolarization is shortened. Meanwhile, during the mutual discharge between the first and second battery packs, the charging device maintains charging at least one of the first and / or second battery packs. This maintains the connection between the charging device and the battery, and after depolarization ends, the charging device can directly recharge the battery without having to go through the process of re-interacting with the battery, further shortening the charging time and improving the charging efficiency.

[0009] In some embodiments, the controller is configured to charge one of the first or second battery packs during mutual discharge between the first and second battery packs. This prevents the first or second battery pack from experiencing continuous charge accumulation due to charging during mutual discharge, thus ensuring a better depolarization effect and improving battery depolarization while maintaining the connection between the charging device and the battery.

[0010] In some embodiments, the controller is configured to perform a first process on the batteries during the mutual discharge of the first battery pack and the second battery pack. The first process includes discharging the first battery pack to the second battery pack via a first module, wherein, in the first process, a charging device is controlled to charge the first battery pack. Since the battery discharge rate is faster than the charging rate, in the first process, while the first battery pack is discharging to the second battery pack, the charging device charges the first battery pack, which can, to some extent, avoid the problem of the first battery pack being depleted due to excessively fast discharge.

[0011] In some embodiments, the controller is configured to perform a second process on the batteries during mutual discharge between the first and second battery packs. The second process includes: discharging the second battery pack to the first battery pack via a first module. In this second process, a charging device is controlled to charge the second battery pack. In this second process, the charging device charges the second battery pack, which can, to some extent, prevent the second battery pack from becoming depleted due to excessively rapid discharge, thus helping to maintain the normal performance of both the first and second battery packs and improving charging efficiency.

[0012] In some embodiments, the first module includes: a switching circuit connected to the battery; and a first energy storage circuit connected to the switching circuit and connected to the battery via the switching circuit. The controller is configured to: during mutual discharge between the first battery pack and the second battery pack, execute N1 operations via the switching circuit to discharge from the first battery pack to the first energy storage circuit and from the first energy storage circuit to the second battery pack, such that the first battery pack discharges to the second battery pack, where N1 is an integer greater than or equal to 1; and execute N2 operations via the switching circuit to discharge from the second battery pack to the first energy storage circuit and from the first energy storage circuit to the first battery pack, such that the second battery pack discharges to the first battery pack, where N2 is an integer greater than or equal to 1. The first energy storage circuit temporarily stores energy. Through the first energy storage circuit, the discharge rate of the first and second battery packs can be controlled, preventing excessive discharge of the first and second battery packs each time and reducing the probability of the first and second battery packs becoming depleted. Meanwhile, through the switching circuit and the first energy storage circuit, the first battery pack can discharge to the second battery pack multiple times, and the second battery pack can discharge to the first battery pack multiple times, thereby making the mutual discharge time between the first battery pack and the second battery pack longer and enhancing the depolarization effect of the first battery pack and the second battery pack.

[0013] In some embodiments, the negative terminals of the first battery pack and the second battery pack are connected. The switching circuit includes: a first bridge arm, a first end of which is connected to the positive terminal of the first battery pack, and a second end of which is connected to the negative terminal of the first battery pack; and a second bridge arm, a first end of which is connected to the positive terminal of the second battery pack, and a second end of which is connected to the second end of the first bridge arm; a first energy storage circuit has a first end connected to the midpoint of the first bridge arm and a second end connected to the midpoint of the second bridge arm; and a controller is configured to: 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 being less than or equal to a first threshold; and 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 in response to the voltage of the first battery pack and / or the second battery pack being greater than the first threshold during charging. In other words, the first ends of the first bridge arm and the second bridge arm are respectively connected to the positive terminals of the first battery pack and the second battery pack, and the second ends of the first bridge arm and the second bridge arm are both connected to the negative terminals of the first battery pack and the second battery pack. 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 circuit 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. When the voltage of the first battery pack and / or the second battery pack is less than or equal to the first threshold, the charging device can be controlled to charge the battery with a large current.

[0014] In some embodiments, the first bridge arm includes a first upper bridge arm and a first lower bridge arm, the first upper bridge arm being connected to the positive terminal of the first battery pack and the first lower bridge arm being connected to the negative terminal 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 being connected to the positive terminal of the second battery pack and the second lower bridge arm being connected to the negative terminal of the second battery pack; the controller is configured to: alternately execute a first operation and a second operation to cause the first battery pack to discharge to the second battery pack; the first operation includes: controlling the first upper bridge arm and the second lower bridge arm to be turned on and the first lower bridge arm and the second upper bridge arm to be turned off; the second operation includes: controlling the first upper bridge arm and the second upper bridge arm to be turned on and the first lower bridge arm and the second lower bridge arm to be turned off; alternately execute a third operation and a fourth operation to cause the second battery pack to discharge to the first battery pack; the third operation includes: controlling the first lower bridge arm and the second upper bridge arm to be turned on and the first upper bridge arm and the second lower bridge arm to be turned off; the fourth operation includes: controlling the first upper bridge arm and the second upper bridge arm to be turned on and the first lower bridge arm and the second lower bridge arm to be turned off. In this way, during the discharge process from 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. The first battery pack can continuously discharge to the first energy storage circuit, further improving the depolarization effect on the first battery pack. Furthermore, it can also make the voltage of the first battery pack and the first energy storage circuit connected in series greater than the voltage of the second battery pack, increasing the success rate of the first energy storage circuit successfully discharging to the second battery pack. Similarly, during the discharge process from 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. The second battery pack can continuously discharge to the first energy storage circuit, improving both the success rate of the first energy storage circuit successfully discharging to the first battery pack and the depolarization effect on the second battery pack.

[0015] In some embodiments, the battery control circuit further includes: a first switch connected to the positive terminals of the first battery pack and the second battery pack; the controller is configured to: control the first switch to close 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 being less than or equal to a first threshold; control the first switch to open in response to the voltage of the first battery pack and the second battery pack being greater than the first threshold during charging, 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 connected in parallel, thereby enabling the first battery pack and the second battery pack to be charged simultaneously through either the first output terminal and the second output terminal, and the voltage of the first battery pack and the second battery pack are consistent, which is beneficial to maintaining the energy balance of the first battery pack and the second battery pack during charging and maintaining stable battery performance. When the voltage of either the first battery pack or the second battery pack exceeds a first threshold, the first switch is disconnected. This means the first and second battery packs are no longer connected in parallel, allowing them to form their own charging and discharging circuits through the first and second bridge arms, respectively, thereby achieving battery depolarization. In other words, switching between the charging and depolarization states of the battery can be achieved by turning the first switch on and off.

[0016] In some embodiments, a second energy storage circuit is connected in parallel across the two ends of the first battery pack. The controller is further configured to: during mutual discharge between the first and second battery packs, perform N3 operations via a switching circuit to discharge from the first battery pack to the second energy storage circuit and from the second energy storage circuit to the second battery pack, where N3 is an integer greater than or equal to 1; and / or during mutual discharge between the first and second battery packs, perform N4 operations via a switching circuit to discharge from the first battery pack to the second energy storage circuit and from the second energy storage circuit to the first battery pack, where N4 is an integer greater than or equal to 1. The second energy storage circuit can also realize discharge from the first battery pack to the second battery pack and / or discharge from the second battery pack to the first battery pack, improving the depolarization effect of the batteries.

[0017] In some embodiments, the controller is further configured to: during the discharge of the first battery pack to the second battery pack, simultaneously execute, via a switching circuit, the discharge of the first battery pack to the first energy storage circuit and the discharge of the first battery pack to the second energy storage circuit, as well as the simultaneous discharge of the first energy storage circuit to the second battery pack and the discharge of the second energy storage circuit to the second battery pack; and during the discharge of the second battery pack to the first battery pack, simultaneously execute, via a switching circuit, the discharge of the second battery pack to the first energy storage circuit and the discharge of the first battery pack to the second energy storage circuit, as well as the simultaneous discharge of the first energy storage circuit to the first battery pack and the discharge of the second energy storage circuit to the first battery pack. Thus, the first battery pack can exchange energy with the second energy storage circuit, increasing the discharge capacity of the first battery pack in a short time, improving the discharge efficiency of the first battery pack, and further enhancing the depolarization effect.

[0018] In some embodiments, the first energy storage circuit includes at least one inductor, and the second energy storage circuit includes a capacitor. The inductor can store a large amount of electricity, improving the energy transfer efficiency between the first and second battery packs, thereby giving the battery a better depolarization effect. The capacitor has a small size and can achieve rapid charging and discharging, further improving the battery depolarization effect while keeping the battery control circuit small, reducing its weight, and lowering costs.

[0019] An embodiment of the second aspect of this application provides a battery system that includes the battery control circuit described in the above embodiments.

[0020] An embodiment of the third aspect of this application provides an electrical device that includes the battery system described in the above embodiments, the battery system being used to provide electrical energy.

[0021] An embodiment of the fourth aspect of this application provides a battery charging control method. The battery includes a first battery pack and a second battery pack, which are respectively connected to an external charging device. The battery is also connected to a first module. The method includes: acquiring the voltages of the first battery pack and the second battery pack during charging by the charging device; and controlling the first module to discharge the first battery pack and the second battery pack 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; wherein, during the mutual discharge between the first battery pack and the second battery pack, the charging device is controlled to charge at least one of the first battery pack and the second battery pack.

[0022] In the above technical solution, during the discharge process, the charge accumulated on the electrodes of the first and second battery packs can be rapidly reduced, the polarization voltage lowered, and the polarization phenomenon improved, thereby enabling high-current charging of the depolarized first and / or second battery packs. Simultaneously, during the mutual discharge between the first and second battery packs, the charging device maintains charging at least one of the first and / or second battery packs. This maintains the connection between the charging device and the battery. After depolarization ends, the charging device can directly recharge the battery without needing to perform a re-interaction process between the charging device and the battery, further shortening the charging time and improving charging efficiency.

[0023] In some embodiments, during the mutual discharge between the first battery pack and the second battery pack, the charging current of the charging device to the first battery pack or the second battery pack is controlled to be less than the discharge current from the first battery pack to the second battery pack, and less than the discharge current from the second battery pack to the first battery pack. This ensures, to a certain extent, that the amount of charge accumulated on the electrodes of the first battery pack or the second battery pack during charging is less than the amount of charge released by the first and second battery packs during discharge, thereby enabling the first and second battery packs to have better depolarization effects and improving battery depolarization.

[0024] In some embodiments, during the mutual discharge between the first battery pack and the second battery pack, controlling the charging device to charge at least one of the first battery pack and the second battery pack includes: during the mutual discharge between the first battery pack and the second battery pack, controlling the charging device to charge one of the first battery pack or the second battery pack. This ensures that the first battery pack or the second battery pack not being charged by the charging device during the mutual discharge between the first battery pack and the second battery pack will not experience continuous charge accumulation due to charging, thus guaranteeing a better depolarization effect to a certain extent. This further improves battery depolarization while maintaining the connection between the charging device and the battery.

[0025] In some embodiments, allowing the first battery pack and the second battery pack to discharge to each other includes performing a first process on the batteries. The first process includes: discharging the first battery pack to the second battery pack via a first module; during the mutual discharge between the first battery pack and the second battery pack, controlling the charging device to charge at least one of the first battery pack and the second battery pack includes: in the first process, controlling the charging device to charge the first battery pack. This can, to some extent, avoid the problem of the first battery pack becoming depleted due to excessively rapid discharge, which is beneficial for maintaining the normal performance of the first battery pack and improving charging efficiency.

[0026] In some embodiments, allowing the first battery pack and the second battery pack to discharge to each other includes performing a second process on the batteries. The second process includes: discharging the second battery pack to the first battery pack via a first module; and controlling a charging device to charge at least one of the first and second battery packs during the mutual discharge between the first and second battery packs includes: controlling the charging device to charge the second battery pack in the second process. This can, to some extent, avoid the problem of the second battery pack becoming depleted due to excessively rapid discharge, thus helping to maintain the normal performance of the second battery pack and improving charging efficiency.

[0027] In some embodiments, the negative terminals of the first battery pack and the second battery pack are connected. The first module includes a switching circuit and a first energy storage circuit. The switching circuit is connected to the battery, and the first energy storage circuit is connected to the switching circuit. Controlling the first module to allow the first battery pack and the second battery pack to discharge to each other includes: performing N1 operations via the switching circuit to discharge the first battery pack to the first energy storage circuit and the first energy storage circuit to the second battery pack, so that the first battery pack discharges to the second battery pack, where N1 is an integer greater than or equal to 1; and performing N2 operations via the switching circuit to discharge the second battery pack to the first energy storage circuit and the first energy storage circuit to the first battery pack, so that the second battery pack discharges to the first battery pack, where N2 is an integer greater than or equal to 1. The first energy storage circuit serves to temporarily store energy. Through the first energy storage circuit, the discharge rate of the first battery pack and the second battery pack can be controlled so that the discharge amount of the first battery pack and the second battery pack is not excessive each time, thereby reducing the probability of the first battery pack and the second battery pack becoming depleted. Meanwhile, through the switching circuit and the first energy storage circuit, the first battery pack can discharge to the second battery pack multiple times, and the second battery pack can discharge to the first battery pack multiple times, thereby making the mutual discharge time between the first battery pack and the second battery pack longer and enhancing the depolarization effect of the first battery pack and the second battery pack.

[0028] In some embodiments, the switching circuit includes: a first bridge arm and a second bridge arm, a first end of the first bridge arm being connected to the positive terminal of the first battery pack and a second end being connected to the negative terminal of the first battery pack; a first end of the second bridge arm being connected to the positive terminal of the second battery pack and a second end being connected to the second end of the first bridge arm; a first end of a first energy storage circuit being connected to the midpoint of the first bridge arm and a second end being connected to the midpoint of the second bridge arm; the method further includes: in response to the voltage of the first battery pack and the second battery pack being less than or equal to a first threshold, controlling the charging device to charge the first battery pack and the second battery pack; wherein, in response to the voltage of the first battery pack and / or the second battery pack being greater than the first threshold, controlling the first module to discharge the first battery pack and the second battery pack to discharge each other includes: in response to the voltage of the first battery pack and / or the second battery pack being greater than the first threshold during charging, controlling the first battery pack and the second battery pack to discharge 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 circuit 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. When the voltage of the first battery pack and / or the second battery pack is less than or equal to the first threshold, the charging device can be controlled to charge the battery with a large current.

[0029] In some embodiments, the first bridge arm includes a first upper bridge arm and a first lower bridge arm, the first upper bridge arm being connected to the positive terminal of the first battery pack and the first lower bridge arm being connected to the negative terminal 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 being connected to the positive terminal of the second battery pack and the second lower bridge arm being connected to the negative terminal of the second battery pack. Discharging from 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. Discharging from 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. In this way, during the discharge process from 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, allowing the first battery pack to continuously discharge into the first energy storage circuit, further enhancing the depolarization effect on the first battery pack. Similarly, during the discharge process from 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, allowing the second battery pack to continuously discharge into the first energy storage circuit, enhancing the depolarization effect on the second battery pack.

[0030] In some embodiments, the positive terminals of the first battery pack and the second battery pack are connected via a first switch. In response to the voltage of the first and second battery packs being less than or equal to a first threshold, the charging device is controlled to charge the first and second battery packs, including: controlling the first switch to close and controlling the charging device to charge the first and second battery packs; in response to the voltage of the first and / or second battery packs being greater than the first threshold, the first module is controlled to discharge the first and second battery packs to each other, including: in response to the voltage of the first and second battery packs being greater than the first threshold during charging, controlling the first switch to open; controlling the charging device to charge the first or second battery pack, and controlling the first and second battery packs to discharge to each other through the first bridge arm, the second bridge arm, and the first energy storage circuit. The switching between the charging state and the depolarization state of the battery can be achieved by opening and closing the first switch.

[0031] In some embodiments, when the charging device is controlled to charge the first battery pack during mutual discharge between the first battery pack and the second battery pack, discharging the first battery pack to the second battery pack further includes: controlling the sum of the charging current of the charging device to the first battery pack and the discharge current of the first battery pack to be equal to the discharge current of the first energy storage circuit to the second battery pack; discharging the second battery pack to the first battery pack further includes: controlling the sum of the charging current of the charging device to the first battery pack and the discharge current of the first energy storage circuit to the first battery pack to be equal to the discharge current of the second battery pack; or, when the charging device is controlled to charge the second battery pack during mutual discharge between the first battery pack and the second battery pack, discharging the first battery pack to the second battery pack further includes: controlling the sum of the charging current of the charging device to the second battery pack and the discharge current of the first energy storage circuit to the second battery pack to be equal to the discharge current of the first battery pack; discharging the second battery pack to the first battery pack further includes: controlling the sum of the charging current of the charging device to the second battery pack and the discharge current of the second battery pack to be equal to the sum of the discharge current of the first energy storage circuit to the first battery pack. This ensures that the voltages of the first and second battery packs are as close as possible during mutual discharge, which helps maintain the stability of the first and second battery packs when charging continues after depolarization is complete.

[0032] In some embodiments, a second energy storage circuit is connected in parallel across the two ends of the first battery pack. The method further includes: during the mutual discharge between the first and second battery packs, performing N3 operations of the first battery pack discharging to the second energy storage circuit and the second energy storage circuit discharging to the second battery pack via a switching circuit, where N3 is an integer greater than or equal to 1; and / or during the mutual discharge between the first and second battery packs, performing N4 operations of the first battery pack discharging to the second energy storage circuit and the second energy storage circuit discharging to the first battery pack via a switching circuit, where N4 is an integer greater than or equal to 1. The second energy storage circuit can also realize the discharge from the first battery pack to the second battery pack, and / or the discharge from the second battery pack to the first battery pack, thereby improving the depolarization effect of the batteries.

[0033] In some embodiments, during the discharge of the first battery pack to the second battery pack, the method further includes: simultaneously executing the discharge of the first battery pack to the first energy storage circuit and the discharge of the first battery pack to the second energy storage circuit via a switching circuit, as well as simultaneously executing the discharge of the first energy storage circuit to the second battery pack and the discharge of the second energy storage circuit to the second battery pack; during the discharge of the second battery pack to the first battery pack, the method further includes: simultaneously executing the discharge of the second battery pack to the first energy storage circuit and the discharge of the first battery pack to the second energy storage circuit via a switching circuit, as well as simultaneously executing the discharge of the first energy storage circuit to the first battery pack and the discharge of the second energy storage circuit to the first battery pack. The first battery pack can exchange energy with the second energy storage circuit, which can increase the discharge capacity of the first battery pack in a short time, improve the discharge efficiency of the first battery pack, and thus further improve the depolarization effect.

[0034] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0035] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0036] Figure 1 is a functional block diagram of a battery control circuit according to some embodiments of this application;

[0037] Figure 2 is a second functional block diagram of the battery control circuit of some embodiments of this application;

[0038] Figure 3 is one of the current waveforms through the first energy storage circuit during mutual discharge between the first battery pack and the second battery pack in some embodiments of this application;

[0039] Figure 4 is a second of the current waveforms passing through the first energy storage circuit during mutual discharge between the first battery pack and the second battery pack in some embodiments of this application.

[0040] Figure 5 is a schematic diagram of the structure of a battery control circuit according to some embodiments of this application;

[0041] Figure 6 is one of the schematic diagrams of the current path during the discharge of the first battery pack to the second battery pack in some embodiments of this application;

[0042] Figure 7 is a second schematic diagram of the current path during the discharge of the first battery pack to the second battery pack in some embodiments of this application;

[0043] Figure 8 is one of the schematic diagrams of the current path during the discharge of the second battery pack to the first battery pack in some embodiments of this application;

[0044] Figure 9 is a second schematic diagram of the current path during the discharge of the second battery pack to the first battery pack in some embodiments of this application;

[0045] Figure 10 is a second schematic diagram of the battery control circuit of some embodiments of this application;

[0046] Figure 11 is a third schematic diagram of the battery control circuit of some embodiments of this application;

[0047] Figure 12 is a flowchart of one of the battery charging control methods according to some embodiments of this application;

[0048] Figure 13 is a flowchart of a battery charging control method according to some embodiments of this application. Detailed Implementation

[0049] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0051] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0052] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0053] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0054] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0055] Batteries undergo polarization during charging and discharging. In some cases, battery polarization occurs because when a large current flows through the electrodes, charge accumulates on the positive and negative electrodes, causing the electrode potentials to deviate from the equilibrium potential. This difference between the battery's actual potential and its equilibrium potential results in a polarization voltage. The larger the charging current, the more charge accumulates on the electrodes, and the greater the polarization voltage. The presence of polarization voltage increases the battery's resistance, reducing the current flowing through the battery and consequently decreasing its charging efficiency.

[0056] The polarization voltage is directly proportional to the actual potential of the battery, that is, directly proportional to the voltage across the battery terminals. During charging, if the battery voltage is too high, severe polarization may have already occurred, thereby reducing the battery's charging efficiency.

[0057] Based on the above considerations, a battery control circuit was designed. The battery includes a first battery pack and a second battery pack connected together, and the first battery pack and the second battery pack are respectively connected to the first output terminal and the second output terminal of the charging device.

[0058] When the voltage of the first battery pack and / or the second battery pack exceeds a first threshold, 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 relatively severe. Based on this, in response to the voltage of the first battery pack and / or the second battery pack exceeding the first threshold, the controller controls the first module to allow the first battery pack and the second battery pack to discharge to each other. During the discharge process, the accumulated charge on the electrodes of the first battery pack and the second battery pack can be rapidly reduced, lowering the polarization voltage and improving the polarization phenomenon. The charging device can then perform high-current charging on the depolarized first battery pack and / or the second battery pack, improving the battery charging efficiency.

[0059] Because of the energy exchange between the first and second battery packs, the first and second battery packs discharge to each other. The charge of the first and second battery packs does not decrease or decreases very little. This can, to a certain extent, ensure that the time for recharging the first and second battery packs after they discharge to each other is shortened.

[0060] Meanwhile, during the mutual discharge between the first and second battery packs, the charging device maintains charging at least one of the first and / or second battery packs. This maintains the connection between the charging device and the battery, and after depolarization ends, the charging device can directly recharge the battery without having to go through the process of re-interacting with the battery, further shortening the charging time and improving the charging efficiency.

[0061] The battery control circuit disclosed in this application can be used, but is not limited to, for charging batteries in electrical devices such as vehicles, ships, or aircraft.

[0062] 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.

[0063] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0064] 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.

[0065] 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.

[0066] Referring to Figure 1, this application embodiment 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.

[0067] 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.

[0068] In some embodiments, the controller 103 may control the first module to cause the first battery pack 11 and the second battery pack 12 to discharge 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 is understood that when the first battery pack 11 discharges to the second battery pack 12, it is equivalent to the second battery pack 12 being charged, and when the second battery pack 12 discharges to the first battery pack 11, it is equivalent to the first battery pack 11 being charged. Since the first battery pack 11 and the second battery pack 12 exchange energy during the mutual discharge, that is, both the first battery pack 11 and the second battery pack 12 involve both charging and discharging processes, this prevents the voltage of the battery pack 11 or the second battery pack 12 with a voltage less than or equal to the first threshold from increasing due to charging during the mutual discharge. This achieves a better depolarization effect on the battery 100 as a whole.

[0069] In other embodiments, the controller 103 may also cause the first battery pack 11 and the second battery pack 12 to discharge to each other in response to the voltages of both the first battery pack 11 and the second battery pack 12 being greater than a first threshold.

[0070] Understandably, during charging, if the first battery pack 11 and the second battery pack 12 are connected in series, the controller 103 can, in response to the voltage of at least one of the first battery pack 11 or the second battery pack 12 being greater than a first threshold, cause the first battery pack 11 and the second battery pack 12 to discharge to each other. If the first battery pack 11 and the second battery pack 12 are connected in parallel during charging, the controller 103, in response to the voltage of both the first battery pack 11 and the second battery pack 12 being greater than the first threshold, causes the first battery pack 11 and the second battery pack 12 to discharge to each other.

[0071] The first threshold can be a specific voltage value or a range. The first threshold can be adjusted according to the type of battery 100. A method for setting the first threshold is to test the relationship between the charging rate of battery 100 and the voltages of the first battery pack 11 and the second battery pack 12 beforehand. When the voltages of the first battery pack 11 and the second battery pack 12 are lower than a certain value or within a certain range, and the charging rate decreases significantly, then that voltage value or range can be set as the first threshold. For example, the first threshold can be 80% of the voltage of battery pack 100 when fully charged.

[0072] The charging device 102 may include, but is not limited to, devices capable of charging the battery 100, such as charging piles.

[0073] In some embodiments, the first battery pack 11 can be connected to the first output terminal of the charging device 102, and the second battery pack 12 can be connected to the second output terminal of the charging device 102. The first output terminal of the charging device 102 may include a first positive terminal and a first negative terminal, and the second output terminal of the charging device 102 may 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 and negative terminals of the first battery pack 11, respectively, and the second positive terminal and the second negative terminal can be connected to the positive and negative terminals of the second battery pack 12, respectively.

[0074] In other embodiments, the first output terminal may include a first positive terminal, the second output terminal may include a second positive terminal, and the charging device 102 may also include a negative terminal. The first output terminal and the second output terminal may share the same negative terminal. That is, the first positive terminal is connected to the positive 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 terminals of the first battery pack 11 and the second battery pack 12 are both connected to the negative terminal.

[0075] 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.

[0076] In some embodiments, the charging device 102 may 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 and the second negative terminal, may all be output terminals of the power module.

[0077] By setting a first output terminal and a second output terminal, it is possible to charge at least one of the first battery pack 11 or the second battery pack 12 during the mutual discharge process of the first battery pack 11 and the second battery pack 12.

[0078] In some embodiments, during the normal charging process of the charging device 102 for the first battery pack 11 and the second battery pack 12, the charging device 102 may also charge the first battery pack 11 and the second battery pack 12 separately through the first output terminal and the second output terminal. Alternatively, when the first battery pack 11 and the second battery pack 12 are connected in parallel, the charging device 102 may also charge the first battery pack 11 and the second battery pack 12 simultaneously through the first output terminal or the second output terminal.

[0079] Before charging the battery 100, the charging device 102 typically needs to interact with the battery 100. The interaction process may include a charging handshake phase and a charging configuration phase.

[0080] For example, during the charging process of the vehicle's battery 100, before the charging pile charges the battery 100, the charging pile needs to enter a handshake phase with the battery 100. The handshake phase refers to the establishment of a communication connection between the charging pile and the battery 100 and the negotiation of charging parameters. The handshake phase typically includes a handshake initiation phase and a handshake identification phase. For instance, the charging pile can send a handshake initiation message to the BMS. After receiving the handshake initiation message, the BMS replies with an acknowledgment within a specified time, indicating that charging is ready. Then, the handshake identification phase begins, which is mainly used for information exchange and authentication.

[0081] Since the interaction process between the charging device 102 and the battery 100 is a fixed process, if the charging device 102 needs to be reconnected to the battery 100 after each disconnection, the interaction needs to be repeated, that is, the handshake phase needs to be re-entered. The handshake phase takes a lot of time, which makes the charging process complicated and time-consuming.

[0082] Based on this, in the embodiments of this application, during the mutual discharge 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 in the future, since the connection between the charging device 102 and the battery 100 is detected, the handshake phase will not be re-entered.

[0083] The controller 103 may include, but is not limited to, the vehicle's MCU (Microcontroller Unit), or the controller 103 in the battery 100's BMS (Battery Management System).

[0084] In some embodiments, the battery 100 further includes a voltage sensor for detecting the voltage of the first battery pack 11 and the second battery pack 12. The voltage sensor is communicatively connected to the BMS (Battery Management System). 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. In response to the voltage of the first battery pack 11 and / or the second battery pack 12 exceeding a first threshold, the controller sends a message to the charging device 102 instructing the first battery pack 11 and the second battery pack 12 to discharge to each other. The controller then controls the first module 101 to cause the first battery pack 11 and the second battery pack 12 to discharge to each other. After receiving the message instructing the first battery pack 11 and the second battery pack 12 to discharge to each other, the charging device 102 performs charging on at least one of the first battery pack 11 and / or the second battery pack 12.

[0085] In some embodiments, the first module 101 may include, but is not limited to, components with charging and discharging functions such as capacitors and inductors. Both capacitors and inductors have charging and discharging functions. When one of the first battery pack 11 or the second battery pack 12 forms a circuit with the first module 101, it can temporarily store the electrical energy released by one of the first battery pack 11 or the second battery pack 12. After the other of the first battery pack 11 and the second battery pack 12 forms a circuit with the first module 101, the capacitor or inductor releases energy to the other of the first battery pack 11 and the second battery pack 12, thereby realizing the discharge of the first battery pack 11 to the second battery pack 12, or the discharge of the second battery pack 12 to the first battery pack 11.

[0086] In the above technical solution, during the discharge process, the charge accumulated on the electrodes of the first battery pack 11 and the second battery pack 12 can be rapidly reduced, the polarization voltage can be lowered, and the polarization phenomenon can be improved. The charging device 102 can charge the depolarized first battery pack 11 and / or second battery pack 12 with a large current, thereby improving the charging efficiency of the battery 100. Because the first battery pack 11 and the second battery pack 12 exchange energy, the charge of the first battery pack 11 and the second battery pack 12 will not decrease or will decrease very little after they discharge to each other. This can, to a certain extent, avoid the problem that the charge of the first battery pack 11 and the second battery pack 12 is too low due to excessive discharge during the mutual discharge process, which would actually increase the charging time. Meanwhile, during the mutual discharge between 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. In this way, the connection between the charging device 102 and the battery 100 can be maintained. After the mutual discharge ends, the charging device 102 can directly recharge the battery 100 without performing the process of re-interacting between the charging device 102 and the battery 100, further shortening the charging time and improving the charging efficiency.

[0087] According to some embodiments of this 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 mutual discharge between the first battery pack 11 and the second battery pack 12.

[0088] For example, the controller 103 is configured to charge the first battery pack 11 via a first output terminal during mutual discharge between the first battery pack 11 and the second battery pack 12. Alternatively, it may charge the second battery pack 12 via a second output terminal during mutual discharge between the first battery pack 11 and the second battery pack 12. Notably, while the charging device 102 is charging the first battery pack 11 or the second battery pack 12 via either the first or the second output terminal, the connection between the other of the first or the second output terminal and the corresponding first battery pack 11 or second battery pack 12 is disconnected.

[0089] 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, the depolarization of the battery 100 can be better improved while maintaining the connection between the charging device 102 and the battery 100.

[0090] According to some embodiments of this application, the controller 103 is configured to perform a first process on the battery 100 during the mutual discharge of the first battery pack 11 and the second battery pack 12. The first process includes: discharging the first battery pack 11 to the second battery pack 12 through the first module 101, wherein, in the first process, the charging device 102 is controlled to charge the first battery pack 11.

[0091] The controller 103 can control the charging device 102 to charge the first battery pack 11 through the first output terminal in the first process by sending a message of the first process to the charging device 102.

[0092] In the above technical solution, since the discharge speed of battery 100 is faster than the charging speed, in the first process, while the first battery pack 11 is discharging to the second battery pack 12, the charging device 102 charges the first battery pack 11, which can avoid the problem of the first battery pack 11 being depleted due to excessively fast discharge speed to a certain extent.

[0093] According to some embodiments of this application, the controller 103 is configured to perform a second process on the battery 100 during the mutual discharge between the first battery pack 11 and the second battery pack 12. The second process includes: discharging the second battery pack 12 to the first battery pack 11 through the first module 101, wherein, in the second process, the charging device 102 is controlled to charge the second battery pack 12.

[0094] In some embodiments, during the mutual discharge of the first battery pack 11 and the second battery pack 12, a first process and a second process may be performed, and exemplarily, the first process and the second process may be performed alternately.

[0095] The controller 103 can control the charging device 102 to charge the second battery pack 12 through the second output terminal in the first process by sending a message of the second processing to the charging device 102.

[0096] In the above technical solution, in the second process, the charging device 102 charges the second battery pack 12, which can avoid the problem of the second battery pack 12 being depleted due to excessive discharge speed to a certain extent, and is conducive to maintaining the normal performance of the second battery pack 12, so as to improve the charging efficiency.

[0097] It is understood that in other embodiments, during the mutual discharge between the first battery pack 11 and the second battery pack 12, only the first process may be performed, and in the first process, the charging device 102 may be controlled to charge the first battery pack 11. Alternatively, during the mutual discharge between the first battery pack 11 and the second battery pack 12, only the second process may be performed, and in the second process, the charging device 102 may be controlled to charge the second battery pack 12.

[0098] Referring to FIG2, according to some embodiments of this application, the first module 101 includes: 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; the controller 103 is configured to: during the mutual discharge of the first battery pack 11 and the second battery pack 12, perform N1 operations 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 through the switching circuit 1011, so that the first battery pack 11 discharges to the second battery pack 12, where N1 is an integer greater than or equal to 1; and perform N2 operations 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 through the switching circuit 1011, so that the second battery pack 12 discharges to the first battery pack 11, where N2 is an integer greater than or equal to 1.

[0099] The switching circuit 1011 enables the first battery pack 11 to form a circuit with the first energy storage circuit 1012, and the first energy storage circuit 1012 to form a circuit with the second battery pack 12. The first energy storage circuit 1012 temporarily stores energy, enabling mutual discharge between the first battery pack 11 and the second battery pack 12. For example, the first battery pack 11 can be connected in series with the second battery pack 12. The switching circuit 1011 may include a first bridge arm, which may include a first upper bridge arm and a first lower bridge arm connected in series. The first upper bridge arm is connected to the positive terminal of the battery 100, and the first lower bridge arm is connected to the negative terminal of the battery 100. The node between the first upper bridge arm and the first lower bridge arm is connected to the first terminal of the first energy storage circuit 1012, and the second terminal 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 respond to the first battery pack 11 and the second battery pack 12. When the voltages of both batteries are less than or equal to the first threshold, the charging device 102 is controlled 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, the first battery pack 11 is discharged to the first energy storage circuit 1012 and the first energy storage circuit 1012 is discharged to the second battery pack 12 via the first bridge arm to perform a first processing on the battery 100. The second battery pack 12 is discharged to the first energy storage circuit 1012 and the first energy storage circuit 1012 is discharged to the first battery pack 11 via the first bridge arm to perform a second processing on the battery 100.

[0100] In other words, the above technical solution involves, in the first process, alternately repeating the steps 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. In the second process, alternately repeating the steps 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.

[0101] The values ​​of N1 and N2 can be set according to the first threshold and the different types of battery 100. After performing N1 operations of the first battery pack 11 discharging to the first energy storage circuit 1012 and the first energy storage circuit 1012 discharging to the second battery pack 12, and performing N2 operations of the second battery pack 12 discharging to the first energy storage circuit 1012 and the first energy storage circuit 1012 discharging to the first battery pack 11, the voltage values ​​of the first battery pack 11 and the second battery pack 12 can both be less than or equal to the first threshold. The values ​​of N1 and N2 can be the same or different.

[0102] 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.

[0103] For example, as shown in FIG3, FIG3 shows the waveform of the current through the first energy storage circuit 1012 when the first battery pack 11 and the second battery pack 12 discharge to each other N1 times and the first energy storage circuit 1012 discharges to the second battery pack 12 N2 times, and when the second battery pack 12 discharges to the first energy storage circuit 1012 and the first energy storage circuit 1012 discharges to the first battery pack 11 N2 times.

[0104] As shown in Figure 3, 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 .

[0105] 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 is completed, at which point the current in the first energy storage circuit 1012 becomes 0.

[0106] 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 down The current alternates between these states until the second processing ends, at which point the current in the first energy storage circuit 1012 becomes 0.

[0107] Figure 4 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.

[0108] As shown in Figure 4, 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.

[0109] It is not difficult to see from the above that, in the case shown in Figure 4, 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 upThe current varies between these values. In the case shown in Figure 3, during the first processing period, the current through 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; 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 the two, and the rate of change of the current through the first energy storage circuit 1012 is much smaller than the rate of change of the current through the first energy storage circuit 1012 in the case shown in Figure 4, thereby greatly reducing the current frequency through the first energy storage circuit 1012.

[0110] In the above technical solution, the first energy storage circuit 1012 serves to temporarily store energy. Through the first energy storage circuit 1012, the discharge rate of the first battery pack 11 and the second battery pack 12 can be controlled, ensuring that the discharge amount of the first battery pack 11 and the second battery pack 12 is not excessive each time, thus reducing the probability of the first battery pack 11 and the second battery pack 12 becoming depleted. Simultaneously, through the switching circuit 1011 and the first energy storage circuit 1012, the first battery pack 11 can discharge to the second battery pack 12 in small amounts and multiple times, and the second battery pack 12 can discharge to the first battery pack 11 multiple times. This results in a longer mutual discharge time between the first battery pack 11 and the second battery pack 12, enhancing the depolarization effect of the first battery pack 11 and the second battery pack 12.

[0111] Referring to Figure 5, according to some embodiments of this application, the negative terminal of the first battery pack 11 and the negative terminal of the second battery pack 12 are connected. The switching circuit 1011 includes: a first bridge arm 20, with a first end connected to the positive terminal of the first battery pack 11 and a second end connected to the negative terminal of the first battery pack 11; and a second bridge arm 21, with a first end connected to the positive terminal of the second battery pack 12 and a second end connected to the second end of the first bridge arm 20; the first end of the first energy storage circuit 1012 is connected to the first bridge arm 20. The controller 103 is configured to: 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 being less than or equal to a first threshold; and control 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 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.

[0112] The second end of the second bridge arm 21 is connected to the second end of the first bridge arm 20, that is, connected to the negative terminal of the first battery pack 11 and the second battery pack 12.

[0113] The positive terminals of the first battery pack 11 and the second battery pack 12 may not be connected, or the positive terminals of the first battery pack 11 and the second battery pack 12 may be connected by a switching element. The switching element is used to control the positive terminals of the first battery pack 11 and the second battery pack 12 to be disconnected during mutual discharge and connected during charging. In the first bridge arm 20 and the second bridge arm 21, the on / off state of the circuits on both sides of the midpoint can be controlled separately. 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. Thus, during the mutual discharge of the first battery pack 11 and the second battery pack 12, since the positive terminals of the first battery pack 11 and the second battery pack 12 are disconnected and respectively connected to the first ends of the first bridge arm 20 and the second bridge arm 21, and the second ends of the first bridge arm 20 and the second bridge arm 21 are both connected to the negative terminals of the first battery pack 11 and the second battery pack 12, by controlling the different conduction modes of the circuits on both sides of the midpoint of the first bridge arm 20 and the second bridge arm 21, the first battery pack 11 and the second battery pack 12 can respectively form different discharge circuits with the first energy storage circuit 1012 through the first bridge arm 20 and the second bridge arm 21.

[0114] For example, 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 can form a loop, so that the first battery pack 11 discharges to the first energy storage circuit 1012, and the first energy storage circuit 1012 stores energy. Similarly, by controlling the first bridge arm 20 and the second bridge arm 21, the second battery pack 12 and the first energy storage circuit 1012 can form a loop, so that the first energy storage circuit 1012 releases energy to the second battery pack 12. Likewise, by controlling the first bridge arm 20, the second battery pack 12 and the first energy storage circuit 1012 can form a loop, so that the second battery pack 12 discharges 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 can form a loop, so that the first energy storage circuit 1012 releases energy to the first battery pack 11.

[0115] In some embodiments, during the entire charging process of the battery, the controller may perform a limited number of operations in response to the voltage of the first battery pack 11 and / or the second battery pack 12 exceeding a first threshold during charging, controlling the first battery pack 11 and / or the second battery pack 12 to discharge to each other, so that the battery can be successfully fully charged. For example, the controller may control the first battery pack 11 and / or the second battery pack 12 to discharge to each other only in response to the first detection during battery charging that the voltage of the first battery pack 11 and / or the second battery pack 12 exceeds the first threshold.

[0116] In the above technical solution, the first battery pack 11 and the second battery pack 12 can form a circuit with the first energy storage circuit 1012 through the first bridge arm 20 and the second bridge arm 21 respectively, so as to discharge to each other and 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, the charging device 102 can be controlled to charge the battery 100 with a large current.

[0117] Referring to Figures 6 to 9, according to some embodiments of this application, the first bridge arm 20 includes a first upper bridge arm and a first lower bridge arm, the first upper bridge arm being connected to the positive terminal of the first battery pack 11 and the first lower bridge arm being connected to the negative terminal 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 being connected to the positive terminal of the second battery pack 12 and the second lower bridge arm being connected to the negative terminal of the second battery pack 12; the controller 103 is configured to alternately execute the first operation and the second operation to cause the first battery pack 11 to discharge to the second battery pack 12.

[0118] The first operation includes: controlling the first upper bridge arm and the second lower bridge arm to be turned on, and controlling the first lower bridge arm and the second upper bridge arm to be turned off.

[0119] 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.

[0120] The controller 103 is also configured to alternately perform the third and fourth operations to cause the second battery pack 12 to discharge to the first battery pack 11.

[0121] The third operation includes: controlling the first lower bridge arm and the second upper bridge arm to be turned on, and controlling the first upper bridge arm and the second lower bridge arm to be turned off.

[0122] 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.

[0123] The first upper bridge arm includes a first upper bridge arm switch V1, and the first lower bridge arm includes a first lower bridge arm switch V2. Turning the first upper bridge arm switch V1 on / off enables the first upper bridge arm to be turned on / off, and turning the first lower bridge arm switch V2 on / off enables the first lower bridge arm to be turned on / off. The types of the first upper bridge arm switch V1 and the first lower bridge arm switch V2 include, but are not limited to, MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) or IGBTs (Insulated-Gate Bipolar Transistors).

[0124] The second upper bridge arm includes a second upper bridge arm switch V3, and the second lower bridge arm includes a second lower bridge arm switch V4. Turning the second upper bridge arm switch V3 on / off enables the second upper bridge arm to be turned on / off, and turning the second lower bridge arm switch V4 on / off enables the second lower bridge arm to be turned on / off. The types of the second upper bridge arm switch V3 and the second lower bridge arm switch V4 include, but are not limited to, MOSFETs or IGBTs.

[0125] The controller 103 is configured to first perform a 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 form a loop, and the current flows from the positive terminal of the first battery pack 11 through the first upper bridge arm, the first energy storage circuit 1012, and the second lower bridge arm, and then flows back to the negative terminal of the first battery pack 11, and the first battery pack 11 discharges to the first energy storage circuit 1012; then, a second operation is performed, 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 form a loop, and the current flows from the first energy storage circuit 1012 through the positive terminal of the second battery pack 12, the negative terminal of the second battery pack 12, the first battery pack 11, and the first upper bridge arm, and then flows back to the first energy storage circuit 1012, and the first energy storage circuit 1012 discharges to the second battery pack 12.

[0126] In some embodiments, the first energy storage circuit 1012 is an inductor. As shown by the solid line with arrows in Figure 6, the current path of the first battery pack 11 discharging into the inductor is shown. As shown by the solid line with arrows in Figure 7, the current path of the inductor discharging into the second battery pack 12 is shown.

[0127] During the second operation, the first terminal of the first energy storage circuit 1012 is connected to the first battery pack 11 via the first upper bridge arm, and the second terminal of the first energy storage circuit 1012 is connected to the second battery pack 12 via the second upper bridge arm. This ensures that the voltage of the first battery pack 11 and the first energy storage circuit 1012 connected in series is greater than the voltage of the second battery pack 12, allowing the first energy storage circuit 1012 to discharge to the second battery pack 12. Furthermore, while the first energy storage circuit 1012 is charging the second battery pack 12, the first battery pack 11 can continuously discharge to the first energy storage circuit 1012, thereby improving the depolarization effect of the first battery pack 11.

[0128] The controller 103 is configured to first perform a third operation, so that 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. The current flows out from the positive terminal of the second battery pack 12, flows through the second upper bridge arm, the first energy storage circuit 1012, and the first lower bridge arm, and finally flows back to the negative terminal of the second battery pack 12, and the second battery pack 12 discharges to the first energy storage circuit 1012. Then, a fourth operation is performed, 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 form a loop. The current flows out from the first energy storage circuit 1012, flows through the first upper bridge arm, the positive and negative terminals of the first battery pack 11, and the second battery pack 12, and finally flows back to the first energy storage circuit 1012, and the first energy storage circuit 1012 discharges to the first battery pack 11.

[0129] In some embodiments, the first energy storage circuit 1012 is an inductor. As shown by the solid line with arrows in Figure 8, the current path of the second battery pack 12 discharging into the inductor is shown. As shown by the solid line with arrows in Figure 9, the current path of the inductor discharging into the first battery pack 11 is shown.

[0130] During the fourth operation, the first terminal of the first energy storage circuit 1012 is connected to the first battery pack 11 via the first upper bridge arm, and the second terminal of the first energy storage circuit 1012 is connected to the second battery pack 12 via the second upper bridge arm. This ensures that the voltage of the second battery pack 12 and the first energy storage circuit 1012 connected in series is greater than the voltage of the first battery pack 11, allowing the first energy storage circuit 1012 to discharge to the first battery pack 11. Furthermore, while the first energy storage circuit 1012 is charging the first battery pack 11, the second battery pack 12 can continuously discharge to the first energy storage circuit 1012, thereby improving the depolarization effect of the second battery pack 12.

[0131] In some embodiments, the first upper bridge arm switch V1 is correspondingly provided with a first freewheeling diode D1, and the first lower bridge arm switch V2 is correspondingly provided with a second freewheeling diode D2. During the interval between switching from the first operation to the second operation and between switching from the second operation to the first operation, current can flow through the first freewheeling diode D1. Similarly, during the interval between switching from the third operation to the fourth operation, current can flow through the second freewheeling diode D2, and during the interval between switching from the fourth operation to the third operation, current can flow through the first freewheeling diode D1. This ensures that current always flows through the inductor during the mutual discharge of the first and second battery packs, thereby reducing the rate of change of the current through the inductor and keeping the frequency of the current flowing through the inductor low. When there are multiple inductors, and these inductors are three-phase windings in the motor, this can greatly improve the problem of high-frequency whistling caused by excessive current flowing through the motor, maintaining relatively stable motor performance and improving the depolarization effect on the battery 100.

[0132] The controller 103 may, in response to the voltage of the first battery pack 11 and the second battery pack 12 being greater than a first threshold during charging, alternately perform a first operation and a second operation, or alternately perform a third operation and a fourth operation, or alternately perform a first process and a second process on the battery 100, in which the first operation and the second operation are alternately performed N1 times, and in the second process, the third operation and the fourth operation are alternately performed N2 times.

[0133] During the discharge process from 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 circuit. The first battery pack 11 can continuously discharge to the first energy storage circuit, further improving the depolarization effect on the first battery pack 11. Furthermore, it can also make the voltage of the first battery pack 11 and the first energy storage circuit connected in series greater than the voltage of the second battery pack 12, increasing the success rate of the first energy storage circuit successfully discharging to the second battery pack 12. Similarly, during the discharge process from 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 circuit. The second battery pack 12 can continuously discharge to the first energy storage circuit, improving the success rate of the first energy storage circuit successfully discharging to the first battery pack 11 while simultaneously enhancing the depolarization effect on the second battery pack 12.

[0134] Referring again to Figures 6 to 9, according to some embodiments of this application, the battery control circuit further includes: a first switch K1 connected to the positive terminal of the first battery pack 11 and the positive terminal of the second battery pack 12; the controller 103 is configured to: control the first switch K1 to close 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 being less than or equal to a first threshold; and control the first switch K1 to open in response to the voltage of the first battery pack 11 and the second battery pack 12 being greater than the first threshold during charging, 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.

[0135] It is understood that, since the negative terminals of the first battery pack 11 and the second battery pack 12 are connected, when the first switch K1 is closed, the positive terminals of the first battery pack 11 and the second battery pack 12 are connected, and 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 either the first output terminal or the second output terminal.

[0136] For example, the first output terminal of the charging device 102 may include a first positive terminal, the second output terminal may include a second positive terminal, and the charging device 102 also includes a negative terminal. The first output terminal and the second output terminal may share the same negative terminal. When the first switch K1 is closed, either the first output terminal or the second output terminal may be connected to the battery 100, and the other may be disconnected from the battery 100.

[0137] In some embodiments, the charging device 102 may further include a first positive charging relay K11, a second positive charging relay K21, and a negative charging relay K12. The first positive charging relay K11 is connected to the first positive terminal and the positive terminal of the first battery pack 11; the second positive charging relay K21 is connected to the second positive terminal and the positive terminal of the second battery pack 12; and the negative charging relay K12 is connected to the negative terminal and the negative terminals of the first battery pack 11 and the second battery pack 12.

[0138] The controller 103 is configured to: in response to the voltage of the first battery pack 11 and the second battery pack 12 being greater than a first threshold during charging, control the first switch K1 to open and send a message to the charging device 102 to cause the first battery pack 11 and the second battery pack 12 to discharge to each other. After receiving the message to cause the first battery pack 11 and the second battery pack 12 to discharge to each other, the charging device 102 controls one of the first charging positive relay K11 and the second charging positive relay K21 to close and the other to open, so as to charge either the first battery pack 11 or the second battery pack 12. As an example, Figures 6 to 9 show the case where the first charging positive relay K11 and the charging negative relay K12 are closed and the second charging positive relay K21 is opened during the discharge of the first battery pack 11 to the second battery pack 12 and the discharge of the second battery pack 12 to the first battery pack 11, so as to charge the first battery pack 11. The dashed line with arrows is a schematic diagram of the current path of the charging device 102 charging the first battery pack 11.

[0139] In some embodiments, the first switch K1 may include, but is not limited to, elements such as relays that can function as switches.

[0140] In some embodiments, the battery control circuit further includes a second switch K2 and a third switch K3. The first end of the second switch K2 is connected to the positive terminal of the first battery pack 11, and the second end of the second switch K2 is connected to the first upper bridge arm, used to control the connection / disconnection between the positive terminal of the first battery pack 11 and the first upper bridge arm. The first end of the third switch K3 is connected to the negative terminal of the first battery pack 11, and the second end of the third switch K3 is connected to the first lower bridge arm, used to control the connection / disconnection between the negative terminal of the first battery pack 11 and the first lower bridge arm. Thus, when the first battery pack 11 and the second battery pack 12 need to discharge to each other, the connection between the first battery pack 11 and the first bridge arm 20 can be controlled by the second switch K2 and / or the third switch K3. When the battery 100 does not need the first battery pack 11 and the second battery pack 12 to discharge to each other, 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, thereby not affecting the normal performance of the battery 100.

[0141] In some embodiments, the second switch K2 can be connected to the first upper bridge arm via the first connector 24, and the third switch K3 can be connected to the first lower bridge arm via the second connector 25. When the negative terminals of the first battery pack 11 and the second battery pack 12 are connected, the second connector 25 is connected to the negative terminals of the first battery pack 11 and the second battery pack 12 via 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 terminals of both the first battery pack 11 and the second battery pack 12 are connected to the same negative terminal of the charging device 102 via the charging negative relay K12.

[0142] In some embodiments, the battery control circuit further includes a fourth switch K4 connected in parallel with the third switch K3 and a first resistor, with the third switch K3 and the first resistor connected in series to provide current limiting protection.

[0143] In some embodiments, the battery control circuit further includes a current sensor 23, which is connected between the first battery pack 11 and the first bridge arm 20. For example, it can be connected between the positive terminal of the battery 100 and the second switch K2 to detect the current output by the battery 100, so as to regulate the current in the battery control circuit during the mutual discharge of the first battery pack and the second battery pack, so as to produce a better depolarization effect on the battery 100.

[0144] In some embodiments, the second switch K2, the third switch K3, and the fourth switch K4 may include, but are not limited to, relays.

[0145] In the above technical solution, during charging, the first switch K1 is closed, connecting the first battery pack 11 and the second battery pack 12 in parallel. This allows the first battery pack 11 and the second battery pack 12 to be charged simultaneously through either the first output terminal or the second output terminal, with the voltages of the first battery pack 11 and the second battery pack 12 being consistent. This helps maintain energy balance between the first battery pack 11 and the second battery pack 12 during charging, ensuring stable performance of the battery 100. When the voltage of either the first battery pack 11 or the second battery pack 12 is detected to be greater than a first threshold, the first switch K1 is opened, meaning the first battery pack and the second battery pack are no longer connected in parallel. This allows the first battery pack and the second battery pack to form their own charging and discharging circuits through the first bridge arm 20 and the second bridge arm 21, respectively, thereby achieving depolarization of the battery 100. In other words, the switching between the charging state and the depolarization state of the battery 100 can be achieved by opening and closing the first switch K1.

[0146] Referring to Figure 10, according to some embodiments of this application, a second energy storage circuit 1013 is also connected in parallel across the two ends of the first battery pack 11. The controller 103 is further configured to: during the mutual discharge between the first battery pack 11 and the second battery pack 12, perform N3 operations of the first battery pack 11 discharging to the second energy storage circuit 1013 and the second energy storage circuit discharging to the second battery pack 12 through the switching circuit 1011, where N3 is an integer greater than or equal to 1; and / or during the mutual discharge between the first battery pack 11 and the second battery pack 12, perform N4 operations of the first battery pack 11 discharging to the second energy storage circuit 1013 and the second energy storage circuit 1013 discharging to the first battery pack 11 through the switching circuit 1011, where N4 is an integer greater than or equal to 1.

[0147] Since the two ends of the first bridge arm 20 are respectively connected to the two ends of the first battery pack 11, the two ends of the second energy storage circuit 1013 are also respectively connected to the two ends of the first bridge arm 20. The first bridge arm 20 is connected to the first energy storage circuit 1012, so that the second energy storage circuit 1013 can be connected to the second battery pack 12 through the first bridge arm 20, the first energy storage circuit 1012 and the second bridge arm 21. In this way, the first battery pack 11 can discharge to the second energy storage circuit 1013 and the second energy storage circuit 1013 can discharge to the second battery pack 12, and / or the first battery pack 11 can discharge to the second energy storage circuit 1013 and the second energy storage circuit 1013 can discharge to the first battery pack 11.

[0148] The values ​​of N3 and N4 can be set according to the first threshold and the different types of battery 100. After performing N3 operations of the first battery pack 11 discharging to the first energy storage circuit 1012 and the first energy storage circuit 1012 discharging to the second battery pack 12, and / or performing N4 operations of the first battery pack 11 discharging to the first energy storage circuit 1012 and the first energy storage circuit 1012 discharging to the first battery pack 11, the voltage values ​​of the first battery pack 11 and the second battery pack 12 can both be less than or equal to the first threshold. The values ​​of N3 and N4 can be the same or different.

[0149] In some embodiments, the second energy storage circuit 1013 may include, but is not limited to, components with charging and discharging functions such as inductors or capacitors.

[0150] 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 of the battery.

[0151] According to some embodiments of this application, the controller 103 is further configured to: during the discharge of the first battery pack 11 to the second battery pack 12, simultaneously execute 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 via the switching circuit 1011, and simultaneously execute 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; during the discharge of the second battery pack 12 to the first battery pack 11, simultaneously execute 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 via the switching circuit 1011, and simultaneously execute 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.

[0152] The second energy storage circuit 1013 is connected in parallel to the first battery pack 11, so that the first battery pack 11 can release energy to the second energy storage circuit 1013, and the second energy storage circuit 1013 can release energy to the first battery pack 11.

[0153] For example, during the execution of the first operation to form 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, the second energy storage circuit 1013 can form 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.

[0154] During the second operation, in which 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, the second energy storage circuit 1013 is able to form 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.

[0155] That is, during the execution of the first operation and the second operation, the first battery pack 11 can simultaneously discharge to the second battery pack 12 through the first energy storage circuit 1012 and the second energy storage circuit 1013.

[0156] 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 form a loop so that the second battery pack 12 discharges to the first energy storage circuit 1012, and the second energy storage circuit 1013 can form 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.

[0157] During 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 form a loop, so that the first energy storage circuit 1012 discharges to the first battery pack 11, and the second energy storage circuit 1013 can form a loop with the first battery pack 11, and the second energy storage circuit 1013 releases energy to the first battery pack 11.

[0158] That is, during the execution of the third and fourth operations, 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.

[0159] 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.

[0160] As shown in Figure 10, 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 and second battery packs, thereby enabling the battery 100 to have a better depolarization effect.

[0161] In some embodiments, the first energy storage circuit 1012 may include an inductor.

[0162] 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.

[0163] 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.

[0164] 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.

[0165] As shown in Figure 11, the capacitor is connected in parallel across the first battery pack 11. During the period when the first battery pack 11, the first upper bridge arm, the inductor, and the second lower bridge arm form a circuit, the capacitor can form a circuit 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.

[0166] 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 circuit, the capacitor can form a circuit with the second battery pack 12, the first upper bridge arm, the inductor and the second upper bridge arm, and the inductor and capacitor release energy to the second battery pack 12.

[0167] The second battery pack 12, the second upper bridge arm, the inductor, and the first lower bridge arm form a circuit so that when the second battery pack 12 discharges to the inductor, the capacitor can form a circuit with the first battery pack 11 so that the first battery pack 11 discharges to the capacitor, and the capacitor stores energy.

[0168] 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 circuit, so that the inductor discharges to the first battery pack 11, and the capacitor acts as a substitute power source, releasing energy to the first battery pack 11.

[0169] In the above technical solution, the capacitor has a small volume and can achieve fast charging and discharging. While further improving the depolarization effect of battery 100, it keeps the battery control circuit small, reduces the weight of the battery control circuit, and lowers the cost.

[0170] This application provides a battery system that includes the battery control circuit described in the above embodiments.

[0171] This application provides an electrical device that includes the battery system described in the above embodiments, the battery system being used to provide electrical energy.

[0172] The battery system includes a battery 100, which is connected to a battery control circuit. The battery system has the beneficial effects of the battery control circuit provided in the embodiments of this application; for details, please refer to the specific descriptions of the battery control circuit in the above embodiments, which will not be repeated here.

[0173] The electrical devices can be referred to the relevant descriptions in the above embodiments, and will not be repeated below.

[0174] Referring to Figures 1 and 12, this application embodiment provides a battery charging control method. The battery 100 includes a first battery pack 11 and a second battery pack 12, which are respectively connected to an external charging device 102. The battery 100 is also connected to a first module 101. The method includes:

[0175] Step 110: Obtain 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;

[0176] Step 120: In response to the voltage of the first battery pack 11 and / or the second battery pack 12 being greater than a first threshold, the first module is controlled to discharge the first battery pack and the second battery pack to each other; wherein, during the mutual discharge of the first battery pack 11 and the second battery pack 12, the charging device 102 is controlled to charge at least one of the first battery pack 11 and the second battery pack 12.

[0177] The structure of the battery 100, the first module 101, and the charging device 102 can be referred to the relevant descriptions in the above embodiments, and will not be repeated below.

[0178] In step 110, the method for obtaining the voltage of the first battery pack 11 and the second battery pack 12 during charging can be referred to the relevant description in the above embodiments, and will not be repeated below.

[0179] Step 120 can be executed by the controller 103 in the above embodiments. The method for setting the first threshold and the method related to step 120 can be referred to the relevant description in the above embodiments, and will not be repeated below.

[0180] In the above technical solution, during the discharge process, the charge accumulated on the electrodes of the first battery pack 11 and the second battery pack 12 can be rapidly reduced, the polarization voltage can be lowered, and the polarization phenomenon can be improved, thereby enabling high-current charging of the depolarized first battery pack 11 and / or second battery pack 12. Simultaneously, during the mutual discharge between 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. This maintains the connection between the charging device 102 and the battery 100. After the mutual discharge between the first battery pack 11 and the second battery pack 12 ends, the charging device 102 can directly recharge the battery 100 without performing the process of re-interacting with the battery 100, further shortening the charging time and improving charging efficiency.

[0181] According to some embodiments of this application, in step 120, the charging current of the charging device 102 to the first battery pack 11 or the second battery pack 12 is less than the discharge current of the first battery pack 11 to the second battery pack 12, and less than the discharge current of the second battery pack 12 to the first battery pack 11.

[0182] In some embodiments, during step 120, when the charging device 102 charges the first battery pack 11, the charging current of the charging device 102 to the first battery pack 11 during the discharge of the first battery pack 11 to the second battery pack 12 is less than the discharge current of the first battery pack 11 to the second battery pack 12, and the charging current of the charging device 102 to the first battery pack 11 during the discharge of the second battery pack 12 to the first battery pack 11 is less than the discharge current of the second battery pack 12 to the first battery pack 11.

[0183] In some other embodiments, in step 120, when the charging device 102 charges the second battery pack 12, the first battery pack 11 discharges to the second battery pack 12. The charging current of the charging device 102 to the second battery pack 12 is less than the discharge current of the first battery pack 11 to the second battery pack 12. During the discharge 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 discharge current of the second battery pack 12 to the first battery pack 11.

[0184] In some other embodiments, when the first battery pack 11 discharges to the second battery pack 12 and the charging device 102 charges the first battery pack 11, the charging current of the charging device 102 to the first battery pack 11 is less than the discharge current of the first battery pack 11 to the second battery pack 12. Conversely, when the second battery pack 12 discharges to the first battery pack 11 and the charging device 102 charges the second battery pack 12, the charging current of the charging device 102 to the second battery pack 12 is less than the discharge current of the second battery pack 12 to the first battery pack 11.

[0185] Understandably, the larger the charging current of battery 100, the faster the charge accumulates on the electrodes of battery 100; conversely, the larger the discharging current of battery 100, the faster the charge is released from the electrodes. Under the same current conditions, the rate at which charge is released during battery 100 discharge is greater than the rate at which charge accumulates during battery 100 charging. By configuring the charging device 102 to provide a charging current to the first battery pack 11 or the second battery pack 12 that is less than the discharging current of the first battery pack 11, the rate at which charge accumulates in the first battery pack 11 or the second battery pack 12 is further reduced compared to the rate at which charge is released during mutual discharge between the first battery pack 11 and the second battery pack 12.

[0186] 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.

[0187] 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.

[0188] 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.

[0189] 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.

[0190] 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.

[0191] 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.

[0192] 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.

[0193] In the first process, the method of controlling the charging device 102 to charge the first battery pack 11 can be referred to the relevant description in the above embodiments, and will not be repeated below.

[0194] The above technical solution can, to a certain extent, avoid the problem of the first battery pack being depleted due to excessively fast discharge speed, which is conducive to maintaining the normal performance of the first battery pack and improving charging efficiency.

[0195] According to some embodiments of this application, step 120 includes performing a second process on the battery, the second process including: discharging the second battery pack 12 to the first battery pack 11 through the first module 101.

[0196] 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 second process, controlling the charging device 102 to charge the second battery pack 12.

[0197] In the second process, the method of controlling the charging device 102 to charge the second battery pack 12 can be referred to the relevant description in the above embodiments, and will not be repeated below.

[0198] The above technical solution can, to a certain extent, avoid the problem of the second battery pack 12 being depleted due to excessively fast discharge speed, which is conducive to maintaining the normal performance of the second battery pack 12 and improving charging efficiency.

[0199] Referring to Figure 2, according to some embodiments of this application, the negative terminal of the first battery pack 11 and the negative terminal of the second battery pack 12 are connected. The first module 101 includes a switching circuit 1011 and a first energy storage circuit 1012. The switching circuit 1011 is connected to the battery 100, and the first energy storage circuit 1012 is connected to the switching circuit 1011.

[0200] Controlling the first module 101 to make the first battery pack 11 and the second battery pack 12 discharge to each other includes: performing N1 operations 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 through the switching circuit 1011, so that the first battery pack 11 discharges to the second battery pack 12, where N1 is an integer greater than or equal to 1.

[0201] Controlling the first module 101 to make the first battery pack 11 and the second battery pack 12 discharge to each other also includes: performing N2 operations 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 through the switching circuit 1011, so that the second battery pack 12 discharges to the first battery pack 11, where N2 is an integer greater than or equal to 1.

[0202] The connection method of the first battery pack 11 and the second battery pack 12, as well as the structure and connection method of the switch circuit 1011 and the first energy storage circuit 1012 with the first battery pack 11 and the second battery pack 12, can be referred to the relevant descriptions in the above embodiments, and will not be repeated below.

[0203] For the specific methods and principles of the first battery pack 11 discharging to the second battery pack 12 and the second battery pack 12 discharging to the first battery pack 11 in the above technical solution, please refer to the relevant descriptions in the above embodiments, which will not be repeated below.

[0204] In the above technical solution, the first energy storage circuit 1012 serves to temporarily store energy. Through the first energy storage circuit 1012, the discharge rate of the first battery pack 11 and the second battery pack 12 can be controlled, ensuring that the discharge amount of the first battery pack 11 and the second battery pack 12 is not excessive each time, thus reducing the probability of the first battery pack 11 and the second battery pack 12 becoming depleted. Simultaneously, through the switching circuit 1011 and the first energy storage circuit 1012, the first battery pack 11 can discharge to the second battery pack 12 multiple times, and the second battery pack 12 can discharge to the first battery pack 11 multiple times. This results in a longer mutual discharge time between the first battery pack 11 and the second battery pack 12, enhancing the depolarization effect of the first battery pack 11 and the second battery pack 12.

[0205] Referring to Figures 5 and 13, according to some embodiments of this 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 to the positive terminal of the first battery pack 11, and a second end is connected to the negative terminal of the first battery pack 11. A first end of the second bridge arm 21 is connected to the positive terminal of the second battery pack 12, and a second end is connected to the second end of the first bridge arm 20. A first energy storage circuit 1012 has 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. The method further includes:

[0206] 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 a first threshold, the charging device 102 is controlled to charge the first battery pack 11 and the second battery pack 12.

[0207] Step 120 includes: in response to the voltage of the first battery pack 11 and / or the second battery pack 12 being greater than a first threshold during charging, 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 mutual discharge between the first battery pack 11 and the second battery pack 12, the charging device 102 is controlled to charge at least one of the first battery pack 11 and the second battery pack 12.

[0208] The structure of the first bridge arm 20 and the second bridge arm 21, as well as their connection with the first battery pack 11 and the second battery pack 12, can be found in the descriptions in the above embodiments, and will not be repeated hereafter.

[0209] For details on the specific methods of performing steps 120 and 130 through the first bridge arm 20, the second bridge arm 21 and the first energy storage circuit 1012, please refer to the relevant descriptions in the above embodiments, which will not be repeated below.

[0210] It is worth noting that step 130 can be executed before step 120. During the execution of step 130, the voltages of the first battery pack 11 and the second battery pack 12 are acquired. In response to the voltages of the first battery pack 11 and the second battery pack 12 being greater than a first threshold, step 120 is executed. After step 120 ends, if 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 executed again, and the battery 100 re-enters the charging state and 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 can be performed only a limited number of times 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, so that the battery can be fully charged smoothly.

[0211] For example, the controller may control the first battery pack 11 and the second battery pack 12 to discharge to each other only in response to the first detection during battery charging that the voltage of the first battery pack 11 and / or the second battery pack 12 is greater than a first threshold.

[0212] It is worth noting that in step 120, the steps of discharging the first battery pack 11 to the second battery pack 12 and discharging the second battery pack 12 to the first battery pack 11 can be executed alternately. That is, the first process and the second process are executed alternately. In the first process, the operation of discharging the first battery pack to the first energy storage circuit and the operation of the first energy storage circuit discharging the second battery pack are performed N1 times. In the second process, the operation of discharging the second battery pack to the first energy storage circuit and the operation of the first energy storage circuit discharging the first battery pack are performed N2 times. The number of alternations, as well as the values ​​of N1 and N2, can be preset according to different batteries 100 and a first threshold, so that after step 120, the voltage 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 voltage of the first battery pack 11 and the second battery pack 12 is greater than the first threshold, it causes the first battery pack 11 and the second battery pack 12 to discharge to each other according to a preset rule.

[0213] In the above technical solution, through the first bridge arm 20 and the second bridge arm 21, the first energy storage circuit 1012 can form a circuit with the first battery pack 11 and the second battery pack 12 respectively, 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. 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, the charging device 102 can be controlled to charge the battery 100 with a large current.

[0214] Referring to Figures 6 to 9, according to some embodiments of this application, the first bridge arm 20 includes a first upper bridge arm and a first lower bridge arm, the first upper bridge arm being connected to the positive electrode of the first battery pack 11 and the first lower bridge arm being 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 being connected to the positive electrode of the second battery pack 12 and the second lower bridge arm being connected to the negative electrode of the second battery pack 12.

[0215] The discharge from the first battery pack 11 to the second battery pack 12 includes: alternately performing the first operation and the second operation.

[0216] The first operation includes: controlling the first upper bridge arm and the second lower bridge arm to be turned on, and controlling 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 controlling the first lower bridge arm and the second lower bridge arm to be turned off.

[0217] The discharge of the second battery pack 12 to the first battery pack 11 includes: alternately performing the third operation and the fourth operation.

[0218] 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.

[0219] The structure of the first upper bridge arm, the first lower bridge arm, the second upper bridge arm, and the second lower bridge arm, as well as their connection with the first battery pack 11 and the second battery pack 12, can be found in the descriptions in the above embodiments, and will not be repeated hereafter.

[0220] The specific methods and principles for performing the first and second operations to discharge the first battery pack 11 to the second battery pack 12, as well as the specific methods and principles for performing the third and fourth operations to discharge the second battery pack 12 to the first battery pack 11, can be referred to the relevant descriptions in the above embodiments, and will not be repeated below.

[0221] In the above technical solution, during the discharge process from 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 circuit, allowing the first battery pack 11 to continuously discharge to the first energy storage circuit 1012, further improving the depolarization effect on the first battery pack 11. Similarly, during the discharge process from 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 circuit, allowing the second battery pack 12 to continuously discharge to the first energy storage circuit 1012, improving the depolarization effect on the second battery pack 12.

[0222] According to some embodiments of this application, the positive terminal of the first battery pack 11 and the positive terminal of the second battery pack 12 are connected by a first switch K1.

[0223] 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 a first threshold, controlling the first switch K1 to close, and controlling the charging device 102 to charge the first battery pack 11 and the second battery pack 12.

[0224] Step 120 includes: in response to the voltage of the first battery pack 11 and the second battery pack 12 being greater than a first threshold during charging, controlling the first switch K1 to open; 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.

[0225] When the positive terminals of the first battery pack 11 and the second battery pack 12 are connected by the first switch K1, the methods for performing steps 130 and 120 can be referred to the relevant descriptions in the above embodiments, and will not be repeated below.

[0226] In the above technical solution, the switching between the charging state and the depolarization state of the battery 100 can be achieved by turning the first switch K1 on and off.

[0227] According to some embodiments of this application, during the mutual discharge between the first battery pack and the second battery pack, when the charging device 102 is controlling the charging device 102 to charge the first battery pack 11, the discharge from the first battery pack 11 to the second battery pack 12 further includes: controlling the sum of the charging current of the charging device 102 to the first battery pack 11 and the discharge current of the first battery pack 11 to be equal to the discharge current of the first energy storage circuit 1012 to the second battery pack 12; the discharge from the second battery pack 12 to the first battery pack 11 further includes: controlling the sum of the charging current of the charging device 102 to the first battery pack 11 and the discharge current of the first energy storage circuit 1012 to the first battery pack 11 to be equal to the discharge current of the second battery pack 12.

[0228] Alternatively, during the mutual discharge of the first battery pack 11 and the second battery pack 12, when the charging device 102 is controlling the charging device 102 to charge the second battery pack 12, the discharge of the first battery pack 11 to the second battery pack 12 further includes: controlling the charging current of the charging device 102 to the second battery pack 12 and the discharge current of the first energy storage circuit 1012 to the second battery pack 12 to be equal to the discharge current of the first battery pack 11; the discharge of the second battery pack 12 to the first battery pack 11 further includes: controlling the charging current of the charging device 102 to the second battery pack 12 and the discharge current of the second battery pack 12 to be equal to the sum of the discharge current of the first energy storage circuit 1012 to the first battery pack 11.

[0229] 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 is understood that since the conduction current of the switch can be controlled by the voltage applied to the control terminal of the switch, during the mutual discharge between the first battery pack 11 and the second battery pack 12, the discharge 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 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, thereby achieving the aforementioned objective.

[0230] In the above technical solution, the voltages of the first battery pack 11 and the second battery pack 12 are as close as possible during the mutual discharge between the first battery pack 11 and the second battery pack 12. This is beneficial to maintaining the stability of the first battery pack 11 and the second battery pack 12 when the battery 100 is recharged after the mutual discharge between the first battery pack 11 and the second battery pack 12 has ended.

[0231] Referring to Figures 10 and 11, according to some embodiments of this application, a second energy storage circuit 1013 is connected in parallel across the two ends of the first battery pack 11. The method further includes: during the mutual discharge between the first battery pack 11 and the second battery pack 12, performing N3 operations of the first battery pack 11 discharging to the second energy storage circuit 1013 and the second energy storage circuit 1013 discharging to the second battery pack 12 through the switching circuit 1011, where N3 is an integer greater than or equal to 1; and / or during the mutual discharge between the first battery pack 11 and the second battery pack 12, performing N4 operations of the first battery pack 11 discharging to the second energy storage circuit 1013 and the second energy storage circuit 1013 discharging to the first battery pack 11 through the switching circuit 1011, where N4 is an integer greater than or equal to 1.

[0232] The structure of the second energy storage circuit 1013, the operation of discharging the first battery pack 11 to the second energy storage circuit 1013 and the second energy storage circuit 1013 to the second battery pack 12 N3 times through the switching circuit 1011, and the method of discharging the first battery pack 11 to the second energy storage circuit 1013 and the second energy storage circuit 1013 to the first battery pack 11 N4 times can be referred to the relevant description in the above embodiments, and will not be repeated below.

[0233] 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 of the battery.

[0234] According to some embodiments of this application, during the discharge of the first battery pack 11 to the second battery pack 12, the discharge is further further performed by the switching circuit 1011, simultaneously performing 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 performing 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.

[0235] During the discharge of the second battery pack 12 to the first battery pack 11, the process also includes: simultaneously performing 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 via the switching circuit 1011, as well as simultaneously performing 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.

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

[0237] 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 and improve the discharge efficiency of the first battery pack 11, thereby further improving the depolarization effect.

[0238] This application provides a battery control circuit. Referring to Figures 6 to 9, the battery includes a first battery pack 11 and a second battery pack 12. The negative terminals of the first battery pack 11 and the second battery pack 12 are connected. The positive and negative terminals of the first battery pack 11 are respectively connected to the first positive charging relay K11 and the negative charging relay K12 of the external charging device 102. The positive and negative terminals of the second battery pack 12 are respectively connected to the second positive charging relay K21 and the negative charging relay K12 of the charging device 102.

[0239] The control circuit includes: a first switch K1, which connects to the positive terminals of the two first battery packs 11 and the second battery pack 12. The control circuit also includes: a first bridge arm 20, with a first end connected to the positive terminal of the first battery pack 11 and a second end connected to the negative terminal of the first battery pack 11; and a second bridge arm 21, with a first end connected to the positive terminal 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, with 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: control the first switch K1 and the charging negative relay K 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. When switch K12 is closed, and either the first positive charging relay K11 or the second positive charging relay K21 is closed, the charging device 102 is controlled to charge the parallel first battery pack 11 and the second battery pack 12; in response to the voltage of the first battery pack 11 and / or the second battery pack 12 being greater than a first threshold during charging, the first switch K1 is controlled to open, and either the first positive charging relay K11 or the second charging relay is closed, and the negative charging relay K12 is closed, and the first processing and the second processing are alternately performed on the battery 100 through the first bridge arm 20, the second bridge arm 21 and the first energy storage circuit 1012.

[0240] After the first battery pack 11 and the second battery pack 12 have finished discharging each other, the controller 103 controls the first switch K1, the negative charging relay K12 to close, and one of the first positive charging relay K11 and the second positive charging relay K21 to close, while the other of the first positive charging relay K11 and the second positive charging relay K21 is opened, so that the charging device 102 continues to charge the battery 100 until the battery 100 is fully charged.

[0241] 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 terminal of the first battery pack 11, and the first lower bridge arm is connected to the negative terminal 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 terminal of the second battery pack 12, and the second lower bridge arm is connected to the negative terminal of the second battery pack 12. The controller 103 is configured to alternately execute a first operation and a second operation to perform a first processing on the battery 100. The first operation includes controlling the first... The upper bridge arm and the second lower bridge arm are turned on, and the first lower bridge arm and the second upper bridge arm are turned off. The second operation includes: controlling the first upper bridge arm and the second upper bridge arm to be turned on, and the first lower bridge arm and the second lower bridge arm to be turned off. The third operation and the fourth operation are alternately executed to perform a second processing on the battery 100. The third operation includes: controlling the first lower bridge arm and the second upper bridge arm to be turned on, and the first upper bridge arm and the second lower bridge arm to be turned off. The first processing and the second processing can be referred to the relevant descriptions in the above embodiments, and will not be repeated here.

[0242] The first energy storage circuit 1012 includes at least one inductor, and a capacitor is connected in parallel across the two ends of the first battery pack 11.

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

Claims

1. A battery control circuit, comprising: The first module is connected to the battery, which includes a first battery pack and a second battery pack, and the first battery pack and the second battery pack are respectively connected to an external charging device. The controller is configured to: acquire the voltages of the first battery pack and the second battery pack during the charging process of the charging device, and, in response to the voltages of the first battery pack and / or the second battery pack being greater than a first threshold, control the first module to cause the first battery pack and the second battery pack to discharge to each other. The controller is also configured to: During the mutual discharge between the first battery pack and the second battery pack, the charging device is controlled to charge at least one of the first battery pack and the second battery pack.

2. The battery control circuit according to claim 1, wherein, The controller is configured to: During the mutual discharge between the first battery pack and the second battery pack, the charging device is controlled to charge either the first battery pack or the second battery pack.

3. The battery control circuit according to claim 1 or 2, wherein, The controller is configured to: During the mutual discharge between the first battery pack and the second battery pack, the batteries undergo a first process. The first process includes: discharging the first battery pack to the second battery pack via the first module, wherein... In the first process, the charging device is controlled to charge the first battery pack.

4. The battery control circuit according to claim 1 or 2, wherein, The controller is configured to: During the mutual discharge between the first battery pack and the second battery pack, the batteries undergo a second process. The second process includes: discharging the second battery pack into the first battery pack via the first module, wherein... In the second process, the charging device is controlled to charge the second battery pack.

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

6. The battery control circuit according to claim 5, wherein, The negative terminals of the first battery pack and the second battery pack are connected, and the switching circuit includes: The first bridge arm has a first end connected to the positive terminal of the first battery pack and a second end connected to the negative terminal of the first battery pack. The second bridge arm has a first end connected to the positive terminal of the second battery pack and a second end connected to the second end of the first bridge arm. The first terminal of the first energy storage circuit is connected to the midpoint of the first bridge arm, and the second terminal is connected to the midpoint of the second bridge arm. The controller is configured to: In response to the voltage of the first battery pack and the second battery pack being less than or equal to a first threshold, the charging device is controlled 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 a first threshold during charging, 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.

7. The battery control circuit according to claim 6, wherein, The first bridge arm includes a first upper bridge arm and a first lower bridge arm, wherein the first upper bridge arm is connected to the positive terminal of the first battery pack, and the first lower bridge arm is connected to the negative terminal of the first battery pack. The second bridge arm includes: a second upper bridge arm and a second lower bridge arm, wherein the second upper bridge arm is connected to the positive terminal of the second battery pack, and the second lower bridge arm is connected to the negative terminal of the second battery pack. The controller is configured to: The first and second operations are performed alternately to cause the first battery pack to discharge into the second battery pack. The first operation includes: controlling the first upper bridge arm and the second lower bridge arm to be turned on, and controlling the first lower bridge arm and the second upper bridge arm to be turned off. The second operation includes: controlling the first upper bridge arm and the second upper bridge arm to be turned on, and the first lower bridge arm and the second lower bridge arm to be turned off; The third and fourth operations are performed alternately to cause the second battery pack to discharge into the first battery pack. The third operation includes: controlling the first lower bridge arm and the second upper bridge arm to be turned on, and controlling the first upper bridge arm and the second lower bridge arm to be turned off. The fourth operation includes: controlling the first upper bridge arm and the second upper bridge arm to be turned on, and the first lower bridge arm and the second lower bridge arm to be turned off.

8. The battery control circuit according to claim 6 or 7, wherein, The battery control circuit also includes: A first switch is connected to the positive terminal of the first battery pack and the positive terminal of the second battery pack; The controller is configured to: In response to the voltage of the first battery pack and the second battery pack being less than or equal to a first threshold, the first switch is controlled to close, and the charging device is controlled 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 being greater than a first threshold during charging, the first switch is controlled to open so that the charging device charges the first battery pack or the second battery pack, and 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.

9. The battery control circuit according to any one of claims 6-8, wherein, A second energy storage circuit is also connected in parallel across the two ends of the first battery pack, and the controller is further configured to: During the mutual discharge between the first battery pack and the second battery pack, the switching circuit performs N3 operations of the first battery pack discharging to the second energy storage circuit and the second energy storage circuit discharging to the second battery pack, where N3 is an integer greater than or equal to 1; and / or During the mutual discharge between the first battery pack and the second battery pack, the switching circuit performs N4 operations of the first battery pack discharging to the second energy storage circuit and the second energy storage circuit discharging to the first battery pack, where N4 is an integer greater than or equal to 1.

10. The battery control circuit according to claim 9, wherein, The controller is also configured to: During the discharge of the first battery pack to the second battery pack, the switching circuit simultaneously performs the discharge of the first battery pack to the first energy storage circuit and the discharge of the first battery pack to the second energy storage circuit, as well as the discharge of the first energy storage circuit to the second battery pack and the discharge of the second energy storage circuit to the second battery pack. During the discharge of the second battery pack to the first battery pack, the switching circuit simultaneously performs the discharge of the second battery pack to the first energy storage circuit and the discharge of the first battery pack to the second energy storage circuit, as well as the simultaneous discharge of the first energy storage circuit to the first battery pack and the discharge of the second energy storage circuit to the first battery pack.

11. The battery control circuit according to claim 9 or 10, wherein, The first energy storage circuit includes at least one inductor, and the second energy storage circuit includes a capacitor.

12. A battery system comprising the battery control circuit according to any one of claims 1-11.

13. An electrical device comprising the battery system of claim 12, wherein the battery system supplies power to the electrical device.

14. A battery charging control method, wherein 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 also connected to a first module, the method comprising: The voltages of the first and second battery packs are obtained during the charging process of the charging device on the battery. In response to the voltage of the first battery pack and / or the second battery pack exceeding a first threshold, the first module is controlled to cause the first battery pack and the second battery pack to discharge to each other; wherein... During the mutual discharge between the first battery pack and the second battery pack, the charging device is controlled to charge at least one of the first battery pack and the second battery pack.

15. The method according to claim 14, wherein, During the mutual discharge between the first battery pack and the second battery pack, the charging current of the charging device to the first battery pack or the second battery pack is controlled to be less than the discharge current from the first battery pack to the second battery pack, and less than the discharge current from the second battery pack to the first battery pack.

16. The method according to claim 14 or 15, wherein, During the mutual discharge between the first battery pack and the second battery pack, controlling the charging device to charge at least one of the first battery pack and the second battery pack includes: During the mutual discharge between the first battery pack and the second battery pack, the charging device is controlled to charge either the first battery pack or the second battery pack.

17. The method according to any one of claims 14-16, wherein, The step of causing the first battery pack and the second battery pack to discharge to each other includes performing a first process on the batteries, the first process including: discharging the first battery pack to the second battery pack through the first module; During the mutual discharge between the first battery pack and the second battery pack, controlling the charging device to charge at least one of the first battery pack and the second battery pack includes: In the first process, the charging device is controlled to charge the first battery pack.

18. The method according to any one of claims 14-16, wherein, The step of causing the first battery pack and the second battery pack to discharge to each other includes performing a second process on the batteries, the second process including: through the first module, performing the second battery pack to discharge to the first battery pack; During the mutual discharge between the first battery pack and the second battery pack, controlling the charging device to charge at least one of the first battery pack and the second battery pack includes: In the second process, the charging device is controlled to charge the second battery pack.

19. The method according to any one of claims 14-18, wherein, The negative terminals of the first battery pack and the second battery pack are connected. The first module includes a switching circuit and a first energy storage circuit. The switching circuit is connected to the battery, and the first energy storage circuit is connected to the switching circuit. The control of the first module to cause the first battery pack and the second battery pack to discharge to each other includes: The switching circuit performs N1 operations of discharging the first battery pack to the first energy storage circuit and discharging the first energy storage circuit to the second battery pack, so that the first battery pack discharges to the second battery pack, where N1 is an integer greater than or equal to 1. The switching circuit performs N2 operations of discharging the second battery pack to the first energy storage circuit and the first energy storage circuit discharging to the first battery pack, so that the second battery pack discharges to the first battery pack, where N2 is an integer greater than or equal to 1.

20. The method according to claim 19, 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 terminal of the first battery pack, and a second end is connected to the negative terminal of the first battery pack. A first end of the second bridge arm is connected to the positive terminal 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 the midpoint of the first bridge arm, and a second end is connected to the midpoint of the second bridge arm. 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, the charging device is controlled to charge the first battery pack and the second battery pack; wherein... The step of controlling the first module to discharge the first battery pack and / or the second battery pack 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 includes: In response to the voltage of the first battery pack and / or the second battery pack being greater than a first threshold during charging, 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.

21. The method according to claim 20, wherein, The first bridge arm includes a first upper bridge arm and a first lower bridge arm, the first upper bridge arm being connected to the positive terminal of the first battery pack, and the first lower bridge arm being connected to the negative terminal 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 being connected to the positive terminal of the second battery pack, and the second lower bridge arm being connected to the negative terminal of the second battery pack. The first battery pack discharging into 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 controlling 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 second battery pack discharging into the first battery pack includes: alternately performing the third and fourth operations. The third operation includes: controlling the first lower bridge arm and the second upper bridge arm to be turned on, and controlling the first upper bridge arm and the second lower bridge arm to be turned off. The fourth operation includes: controlling the first upper bridge arm and the second upper bridge arm to be turned on, and the first lower bridge arm and the second lower bridge arm to be turned off.

22. The method according to claim 20 or 21, wherein, The positive terminals of the first battery pack and the second battery pack are connected via a first switch. The step of 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 the second battery pack being less than or equal to a first threshold includes: Control the first switch to close, and control the charging device to charge the first battery pack and the second battery pack; The step of controlling the first module to discharge the first battery pack and / or the second battery pack 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 includes: In response to the voltage of the first battery pack and the second battery pack being greater than a first threshold during charging, the first switch is controlled to open. 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 to each other through the first bridge arm, the second bridge arm and the first energy storage circuit.

23. The method according to any one of claims 19-22, wherein, When the first battery pack and the second battery pack are discharging each other, and the charging device is controlled to charge the first battery pack... The first battery pack discharging to the second battery pack further includes: controlling the sum of the charging current of the charging device to the first battery pack and the discharging current of the first battery pack to be equal to the discharging current of the first energy storage circuit to the second battery pack; Discharging the second battery pack to the first battery pack further includes: controlling the sum of the charging current of the charging device to the first battery pack and the discharging current of the first energy storage circuit to the first battery pack to be equal to the discharging current of the second battery pack; or, When the first battery pack and the second battery pack are discharging each other, and the charging device is controlled to charge the second battery pack... The first battery pack discharging to the second battery pack further includes: controlling the sum of the charging current of the charging device to the second battery pack and the discharging current of the first energy storage circuit to the second battery pack to be equal to the discharging current of the first battery pack; The second battery pack discharging to the first battery pack further includes controlling the sum of the charging current of the charging device to 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.

24. The method according to any one of claims 20-23, wherein, The first battery pack is further connected in parallel with a second energy storage circuit, and the method also includes: During the mutual discharge between the first battery pack and the second battery pack, the switching circuit performs N3 operations of the first battery pack discharging to the second energy storage circuit and the second energy storage circuit discharging to the second battery pack, where N3 is an integer greater than or equal to 1; and / or During the mutual discharge between the first battery pack and the second battery pack, the switching circuit performs N4 operations of the first battery pack discharging to the second energy storage circuit and the second energy storage circuit discharging to the first battery pack, where N4 is an integer greater than or equal to 1.

25. The method according to claim 24, wherein, During the discharge of the first battery pack to the second battery pack, the method further includes: simultaneously executing the discharge of the first battery pack to the first energy storage circuit and the discharge of the first battery pack to the second energy storage circuit via the switching circuit, as well as simultaneously executing the discharge of the first energy storage circuit to the second battery pack and the discharge of the second energy storage circuit to the second battery pack. During the discharge of the second battery pack to the first battery pack, the method further includes: simultaneously executing the discharge of the second battery pack to the first energy storage circuit and the discharge of the first battery pack to the second energy storage circuit via the switching circuit, as well as simultaneously executing the discharge of the first energy storage circuit to the first battery pack and the discharge of the second energy storage circuit to the first battery pack.

Images