Battery system and control method

Abstract

The invention provides a battery system and a control method, and belongs to the technical field of batteries. The battery system includes: a first battery configured to output electric energy; a second battery configured to output electric energy; the first switch is connected between the positive electrode of the first battery and the positive electrode of the second battery; the second switch is connected between the negative electrode of the first battery and the positive electrode of the second battery; the third switch is connected between the negative electrode of the first battery and the negative electrode of the second battery; the first current detector is connected with the first battery and / or the second battery and is configured to detect current flowing through the first battery and / or the second battery; and a second current detector connected in series with the second battery and configured to detect a current flowing through the second battery. The system can improve the reliability of current detection.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery system and control method. Background Technology

[0002] Energy conservation and emission reduction are key to sustainable social development. Rechargeable batteries, with their ability to store and release energy as needed, are widely used in various electrical devices and energy storage systems, and are an important component in promoting energy transition and sustainable development. For the new energy industry, battery technology is a crucial factor in its development.

[0003] During battery use, parameters such as the battery's output current are typically tested to determine if the battery is functioning properly. However, existing testing methods often have measurement errors and are prone to failure, resulting in unreliable battery testing processes. Summary of the Invention

[0004] This application aims to at least address the technical problem of poor reliability in battery testing processes in the prior art. Therefore, one objective of this application is to provide a battery system that improves the reliability of the battery testing process and obtains more accurate testing results.

[0005] An embodiment of the first aspect of this application provides a battery system comprising: a first battery configured to output electrical energy; a second battery configured to output electrical energy; a first switch connected between the positive terminals of the first and second batteries, the first switch being configured to selectively conduct the positive terminals of the first and second batteries; a second switch connected between the negative terminal of the first and second batteries, the second switch being configured to selectively conduct the negative terminal of the first and second batteries; a third switch connected between the negative terminals of the first and second batteries, the third switch being configured to selectively conduct the negative terminals of the first and second batteries; and a first current detector connected to the first and / or second batteries and configured to perform at least one of the following: detecting current flowing through the first battery when the second switch is closed and both the first and third switches are open. The system includes: a first current detector, connected in series with the second battery and configured to detect the current flowing through the first battery and / or the second battery; a first current detector, connected to the first shunt and configured to detect the current flowing through the first battery and / or the second battery based on the first shunt; and a first detection device, connected to the first shunt and configured to detect the current flowing through the first battery and / or the second battery based on the first shunt. The first detection device includes a first detection channel and a second detection channel, at least one of which is connected to the first shunt.

[0006] In the technical solution of this application embodiment, by rationally designing the connection relationship between the switch and the current detector in the battery system, redundant current detection can be achieved, and the current in each circuit can be accurately detected. Even if there is a fault in some components in the battery system, current detection can still be achieved, improving the reliability of current detection. Using a shunt and a corresponding detection device, accurate current sampling can be achieved, reducing detection errors. Using a detection device with two detection channels can achieve redundant detection; if one detection channel malfunctions, the other detection channel can still perform current sampling, improving the reliability of the battery system.

[0007] In some embodiments, the first current detector is connected to the negative terminal of the second battery or the positive terminal of the first battery. By rationally designing the position of the first current detector in the battery system, a redundant detection circuit can be formed, enabling accurate current detection.

[0008] In some embodiments, a second current detector is connected between a second battery and a first current detector, and a third switch is connected in parallel with the second switch, the second battery, and the second current detector, which are connected in series. By properly designing the position of the second current detector in the battery system, a redundant detection circuit can be formed, enabling accurate current detection.

[0009] In some embodiments, the first current detector is connected to both the negative terminal of the second battery and the third switch, the second current detector is connected between the negative terminal of the second battery and the first current detector, and also between the negative terminal of the second battery and the third switch. By rationally designing the connection relationship between the first and second current detectors, the current in each circuit can be detected, and even if one current detector fails, the other current detector can still perform current detection, thus improving the reliability of the battery system.

[0010] In some embodiments, the second current detector includes: a second shunt connected in series with the second battery; and a second detection device connected to the second shunt and configured to detect the current flowing through the second battery based on the second shunt. Using the shunt and the corresponding detection device allows for accurate sampling of the current, reducing detection errors.

[0011] In some embodiments, the second detection device includes a third detection channel and a fourth detection channel, at least one of which is connected to the second shunt. Using a detection device with two detection channels enables redundant detection, allowing current sampling to be performed by the other detection channel even if one channel malfunctions, thus improving the reliability of the battery system.

[0012] In some embodiments, the battery system further includes a controller configured to: control both the first switch and the third switch to be open; and control the second switch to be closed to output a first voltage. By switching the states of the various switches in the battery system, the circuit topology can be changed, enabling flexible adjustment of the output voltage.

[0013] In some embodiments, the controller is configured to: in response to the second switch being closed and both the first and third switches being open, control the first current detector and / or the second current detector to detect the current flowing through the first and second batteries. When the two batteries are connected in series, both current detectors can perform current detection, which can effectively improve the accuracy and reliability of the detection results.

[0014] In some embodiments, the controller is configured to disconnect the second switch in response to a preset first current condition being met by the current flowing through the first and second batteries. Disconnecting the corresponding switch promptly when the detected current fails to meet usage requirements can reduce component failures caused by abnormal current and improve the safety of the battery system.

[0015] In some embodiments, the controller is configured to: control the second switch to open; and control the first switch and / or the third switch to close, so as to output a second voltage. By switching the states of the various switches in the battery system, the circuit topology can be changed, enabling flexible adjustment of the output voltage.

[0016] In some embodiments, the controller is configured to: control a first current detector to detect the current flowing through the first and second batteries in response to the second switch being open and both the first and third switches being closed; control a second current detector to detect the current flowing through the second battery; and determine the current flowing through the first battery based on the currents flowing through the first and second batteries and the current flowing through the second battery. When the two batteries are connected in parallel, the current flowing through each battery can be obtained through two current detectors, improving the accuracy of the detection results.

[0017] In some embodiments, the controller is configured to: disconnect a first switch in response to a pre-set second current condition being met; and disconnect a third switch in response to a pre-set third current condition being met. Timely disconnection of the corresponding switch when the detected current does not meet the usage requirements can reduce component failures caused by abnormal current and improve the safety of the battery system.

[0018] In some embodiments, the controller is configured to: in response to both the second and third switches being open and the first switch being closed, control the first current detector and / or the second current detector to detect the current flowing through the second battery. When only the second battery is outputting, both current detectors can perform current detection, effectively improving the accuracy and reliability of the detection results.

[0019] In some embodiments, the controller is configured to disconnect the first switch in response to a pre-set fourth current condition being met by the current flowing through the second battery. Disconnecting the corresponding switch promptly when the detected current fails to meet usage requirements can reduce component failures caused by abnormal current and improve the safety of the battery system.

[0020] In some embodiments, the controller is configured to control a first current detector to detect the current flowing through the first battery in response to both the first and second switches being open and the third switch being closed. When only the first battery is outputting, current detection can be performed using the first current detector, enabling current detection under different conditions and achieving a redundant design for current detection.

[0021] In some embodiments, the controller is configured to disconnect the third switch in response to a pre-set fifth current condition being met by the current flowing through the first battery. Disconnecting the corresponding switch promptly when the detected current fails to meet usage requirements can reduce component failures caused by abnormal current and improve the safety of the battery system.

[0022] In some embodiments, the controller is configured to determine the state of a first current detector and / or a second current detector. By detecting the state of the current detectors, potential faults can be identified in a timely manner, reducing detection errors caused by current detector malfunctions and decreasing the frequency of manual inspection and maintenance.

[0023] In some embodiments, the battery system further includes: a first protector connected between the positive terminals of the first and second batteries and in series with a first switch, the first protector being configured to provide overcurrent protection to the battery system; and a second protector connected between the negative terminals of the first and second batteries and in series with a third switch, the second protector being configured to provide overcurrent protection to the battery system. By incorporating protectors into the battery system, the risk of damage to the battery system due to abnormal current can be reduced, thereby improving the safety of the battery system.

[0024] An embodiment of the second aspect of this application provides a control method for a battery system, used in the battery system described in the above embodiments, comprising: controlling both a first switch and a third switch to be open; and controlling a second switch to be closed to output a first voltage. By switching the states of the various switches in the battery system, the circuit topology can be changed, thereby achieving flexible adjustment of the output voltage.

[0025] In some embodiments, the control method further includes: in response to the second switch being closed and both the first and third switches being open, controlling the first current detector and / or the second current detector to detect the current flowing through the first battery and the second battery. When the two batteries are connected in series, both current detectors can detect the current, which can effectively improve the accuracy and reliability of the detection results.

[0026] In some embodiments, the control method further includes: controlling the second switch to open; and controlling the first switch and / or the third switch to close, so as to output a second voltage. By switching the states of the various switches in the battery system, the circuit topology can be changed, enabling flexible adjustment of the output voltage.

[0027] In some embodiments, the control method further includes: in response to the second switch being open and both the first and third switches being closed, controlling a first current detector to detect the current flowing through the first and second batteries; controlling a second current detector to detect the current flowing through the second battery; and determining the current flowing through the first battery based on the current flowing through the first and second batteries and the current flowing through the second battery. When the two batteries are connected in parallel, the current flowing through each battery can be obtained through two current detectors, improving the accuracy of the detection results.

[0028] In some embodiments, the control method further includes: in response to both the second switch and the third switch being open and the first switch being closed, controlling the first current detector and / or the second current detector to detect the current flowing through the second battery. When only the second battery is outputting, both current detectors can perform current detection, effectively improving the accuracy and reliability of the detection results.

[0029] In some embodiments, the control method further includes: in response to both the first switch and the second switch being open and the third switch being closed, controlling the first current detector to detect the current flowing through the first battery. When only the first battery is outputting, current detection can be performed using the first current detector, enabling current detection under different conditions and achieving a redundant design for current detection.

[0030] In some embodiments, the control method further includes determining the state of the first current detector and / or the second current detector. By detecting the state of the current detectors, potential faults can be identified in a timely manner, reducing detection errors caused by current detector malfunctions and decreasing the frequency of manual inspection and maintenance.

[0031] 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

[0032] 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.

[0033] Figure 1 This is a schematic diagram of a battery system according to some embodiments of this application; Figure 2 This is a schematic diagram of a battery system according to some embodiments of this application; Figure 3 This is a schematic diagram illustrating the battery connection relationships in some embodiments of this application; Figure 4 This is a schematic diagram illustrating the battery connection relationships in some embodiments of this application; Figure 5 This is a schematic diagram illustrating the battery connection relationships in some embodiments of this application; Figure 6 This is a schematic diagram illustrating the battery connection relationships in some embodiments of this application; Figure 7 This is a schematic diagram of a battery system according to some embodiments of this application; Figure 8 This is a schematic flowchart illustrating the control method of a battery system according to some embodiments of this application; Figure 9 This is a schematic diagram illustrating the output of the second voltage in some embodiments of this application; Figure 10 This is a schematic diagram of a battery system according to some embodiments of this application.

[0034] Explanation of reference numerals in the attached figures: Battery system 100; First battery U1, second battery U2, first switch K1, second switch K2, third switch K3, first current detector T1, second current detector T2, first shunt R1, first detection device Q1, second shunt R2, second detection device Q2, first protector F1, second protector F2. Detailed Implementation

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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).

[0041] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0042] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0043] Currently, the application of rechargeable batteries is becoming increasingly widespread, judging from market trends. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in various electronic devices, such as electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As the application areas of rechargeable batteries continue to expand, the market demand is also constantly increasing.

[0044] During battery use, parameters such as the battery's output current are typically monitored to determine its normal operating condition. For redundant power supply design, multiple batteries are sometimes used to output power. Each battery corresponds to a specific power supply circuit for power transmission. However, current technologies usually only monitor the current of the entire battery system, using single-point sampling with a single current detector. For battery systems with different battery circuits, there is a lack of detection methods that can monitor the current of each individual circuit. Furthermore, current detection results obtained using single-point sampling often contain errors, and current cannot be detected if the current detector fails. Therefore, a detection system capable of redundant monitoring is needed for batteries.

[0045] To improve the reliability of the battery detection process, multiple switches can be used to switch the circuit topology in the battery system, and multiple current detectors can be used to detect the current in different battery loops. In this way, the voltage output by the battery in the battery system can be adjusted as the circuit topology is switched. For each battery loop, a corresponding current detector will detect the current. Even in abnormal situations such as component failure or battery loop disconnection in the battery system, the current detection function can still be achieved.

[0046] Using such a battery system can effectively improve the reliability of the battery testing process, realize redundant current detection, accurately detect the current during battery use, and promptly identify abnormal current conditions.

[0047] The battery system disclosed in this application can be used, but is not limited to, in electrical devices or energy storage devices such as vehicles, ships, or aircraft. A power system for such an electrical device or energy storage device can be constructed using the battery system disclosed in this application, which helps to improve the reliability of the battery testing process.

[0048] This application provides a battery system. (See reference...) Figure 1 The battery system 100 includes a first battery U1, a second battery U2, a first switch K1, a second switch K2, a third switch K3, a first current detector T1, and a second current detector T2.

[0049] The first battery U1 is configured to output electrical energy.

[0050] The second battery U2 is configured to output electrical energy.

[0051] A first switch K1 is connected between the positive terminal of the first battery U1 and the positive terminal of the second battery U2. The first switch K1 is configured to selectively conduct the positive terminals of the first battery U1 and the second battery U2.

[0052] The second switch K2 is connected between the negative terminal of the first battery U1 and the positive terminal of the second battery U2. The second switch K2 is configured to selectively conduct the negative terminal of the first battery U1 and the positive terminal of the second battery U2.

[0053] The third switch K3 is connected between the negative terminal of the first battery U1 and the negative terminal of the second battery U2. The third switch K3 is configured to selectively conduct the negative terminals of the first battery U1 and the second battery U2.

[0054] The first current detector T1 is connected to the first battery U1 and / or the second battery U2 and is configured to detect the current flowing through the first battery U1 and / or the second battery U2.

[0055] The second current detector T2 is connected in series with the second battery U2 and is configured to detect the current flowing through the second battery U2.

[0056] In embodiments of this application, the term "battery" may encompass a single battery cell, or a series, parallel, or hybrid configuration of multiple battery cells (e.g., a battery pack or battery module).

[0057] like Figure 1 As shown, the battery system 100 includes two batteries. A first switch K1 is located between the positive terminals of the first battery U1 and the second battery U2. When the first switch K1 is closed, the positive terminals of the first battery U1 and the second battery U2 are connected; when the first switch K1 is open, the positive terminals of the first battery U1 and the second battery U2 are not connected. A second switch K2 is located between the negative terminal of the first battery U1 and the second battery U2. When the second switch K2 is closed, the negative terminal of the first battery U1 and the second battery U2 are connected; when the second switch K2 is open, the negative terminal of the first battery U1 and the second battery U2 are not connected. A third switch K3 is located between the negative terminal of the first battery U1 and the second battery U2. When the third switch K3 is closed, the negative terminals of the first battery U1 and the second battery U2 are connected; when the third switch K3 is open, the negative terminals of the first battery U1 and the second battery U2 are not connected.

[0058] The battery system 100 also includes two current detectors. These current detectors are used to detect the current values ​​in each circuit. For example... Figure 1 As shown, the second current detector T2 is connected in series with the second battery U2, and can detect the current in the circuit where the second battery U2 is located, that is, the current flowing through the second battery U2. It should be understood that although in Figure 1 The second current detector T2 is shown to be connected in series with the negative terminal of the second battery U2. However, in other embodiments, the second current detector T2 can also be connected in series with the positive terminal of the second battery U2. This connection method can also realize the detection of the current flowing through the second battery U2.

[0059] As the states of the switches in the battery system 100 change, the first terminal A of the first current detector T1 may be connected to the first battery U1, the second battery U2, or both the first battery U1 and the second battery U2. For example, when the first switch K1 and the third switch K3 are open and the second switch K2 is closed, the first terminal A of the first current detector T1 is connected to the second battery U2 and will detect the current flowing through the first battery U1 and the second battery U2; when the first switch K1 and the third switch K3 are closed and the second switch K2 is open, the first terminal A of the first current detector T1 is connected to both the first battery U1 and the second battery U2 and will detect the total current flowing through the first battery U1 and the second battery U2; when the second switch K2 and the third switch K3 are open and the first switch K1 is closed, the first terminal A of the first current detector T1 will be connected to the second battery U2 and will detect the current flowing through the second battery U2; when the first switch K1 and the second switch K2 are open and the third switch K3 is closed, the first terminal A of the first current detector T1 will be connected to the first battery U1 and will detect the current flowing through the first battery U1. It should be understood that, although in Figure 1 The first terminal of the first current detector T1 is shown to be connected to the negative terminal of the second battery U2, but in other embodiments, the first terminal of the first current detector T1 can also be connected to the first battery U1, such as... Figure 10 As shown, this connection method can also realize the detection of the current flowing through the first battery U1 and / or the second battery U2.

[0060] In one example, the first switch K1, the second switch K2, and the third switch K3 can use switching elements such as relays and metal-oxide-semiconductor field-effect transistors (MOS). It should be understood that although in Figure 1 While the switch is illustrated as a single switching element, in other embodiments, the first switch K1, the second switch K2, and the third switch K3 may also be a switching module that includes multiple switching elements or includes switching elements and other components. This application does not limit this.

[0061] By rationally designing the connection relationship between switches and current detectors in the battery system, redundant current detection can be achieved, and the current in each circuit can be accurately detected. Even if there are faults in some components in the battery system, current detection can still be achieved, thus improving the reliability of current detection.

[0062] According to some embodiments of this application, the first current detector T1 is connected to the negative terminal of the second battery U2 or the positive terminal of the first battery U1.

[0063] exist Figure 1 In the illustrated embodiment, the first terminal A of the first current detector T1 is connected to the negative terminal of the second battery U2. That is, the first current detector T1 is connected between the negative terminal of the second battery U2 and node 2 in the circuit, i.e., connected to the main circuit of the battery system 100, and can be used to detect the current in the main circuit of the battery system 100. In this embodiment, the first terminal A of the first current detector T1 is also connected to the negative terminal of the second battery U2 and the third switch K3. As described above, when the first switch K1 and the third switch K3 are open and the second switch K2 is closed, the current in the main circuit detected by the first current detector T1 is also the current flowing through the first battery U1 and the second battery U2; when the first switch K1 and the third switch K3 are closed and the second switch K2 is open, the current in the main circuit detected by the first current detector T1 is also the total current flowing through the first battery U1 and the second battery U2; when the second switch K2 and the third switch K3 are open and the first switch K1 is closed, the current in the main circuit detected by the first current detector T1 is also the current flowing through the second battery U2; when the first switch K1 and the second switch K2 are open and the third switch K3 is closed, the current in the main circuit detected by the first current detector T1 is also the current flowing through the first battery U1.

[0064] In other embodiments, the first terminal A of the first current detector T1 can also be connected to the positive terminal of the first battery U1, that is, the first current detector T1 is connected between the positive terminal of the first battery U1 and node 1 in the circuit, i.e., connected to the main circuit of the battery system 100, and can be used to detect the current in the main circuit of the battery system 100. In this embodiment, the first terminal A of the first current detector T1 is simultaneously connected to the negative terminal of the first battery U1 and the first switch K1.

[0065] By rationally designing the position of the first current detector T1 in the battery system, a redundant detection circuit can be formed to achieve accurate current detection.

[0066] According to some embodiments of this application, the second current detector T2 is connected between the second battery U2 and the first current detector T1, and the third switch K3 is connected in parallel with the second switch K2, the second battery U2 and the second current detector T2 which are connected in series.

[0067] exist Figure 1 In the illustrated embodiment, since the first terminal A of the first current detector T1 is connected to the negative terminal of the second battery U2, the connection of the second current detector T2 between the second battery U2 and the first terminal A of the first current detector T1 also means that the second current detector T2 is connected in series between the negative terminal of the second battery U2 and the first terminal A of the first current detector T1. The second current detector T2 is also connected in series between the negative terminal of the second battery U2 and the third switch K3. Figure 1 As shown, the second switch K2, the second battery U2, and the second current detector T2 are connected in series and then connected in parallel with the third switch K3. Alternatively, the second current detector T2 can be understood as being connected in series in the branch containing the second battery U2, and can be used to detect the current flowing through the second battery U2.

[0068] As described above, the first terminal A of the first current detector T1 can also be connected to the positive terminal of the first battery U1. In this embodiment, as... Figure 10 As shown, the connection of the second current detector T2 between the second battery U2 and the first terminal A of the first current detector T1 also means that the second current detector T2 is connected in series between the positive terminal of the second battery U2 and the first terminal A of the first current detector T1. In this embodiment, the second current detector T2 can be connected in series between the positive terminal of the second battery U2 and the first switch K1, and also connected in series between the positive terminal of the second battery U2 and the second switch K2. Figure 1 Similar to the embodiments in, in Figure 10 In the illustrated embodiment, the second switch K2, the second current detector T2, and the second battery U2 are connected in series and then connected in parallel with the third switch K3. Alternatively, the second current detector T2 can be understood as being connected in series in the branch containing the second battery U2, and can be used to detect the current flowing through the second battery U2.

[0069] By rationally designing the position of the second current detector in the battery system, a redundant detection circuit can be formed, enabling accurate current detection.

[0070] According to some embodiments of this application, the first current detector T1 is connected to both the negative terminal of the second battery U2 and the third switch K3, the second current detector T2 is connected between the negative terminal of the second battery U2 and the first current detector T1, and the second current detector T2 is connected between the negative terminal of the second battery U2 and the third switch K3.

[0071] like Figure 1As shown, the first terminal A of the first current detector T1 is connected to both the negative terminal of the second battery U2 and the third switch K3. That is, the first current detector T1 is connected between the negative terminal of the second battery U2 and node 2 in the circuit, and can be used to detect the current in the main circuit of the battery system 100. The two terminals of the second current detector T2 are connected to the negative terminal of the second battery U2 and the first terminal A of the first current detector T1, respectively. The end of the second current detector T2 connected to the first current detector T1 is also connected to the third switch K3. This can be understood as the second current detector T2 being connected in series in the branch where the second battery U2 is located, and can be used to detect the current flowing through the second battery U2.

[0072] By rationally designing the connection relationship between the first current detector and the second current detector, the current of each circuit can be detected. Even if one current detector fails, the other current detector can still detect the current, thereby improving the reliability of the battery system.

[0073] According to some embodiments of this application, reference is made to Figure 2 The first current detector T1 includes a first shunt R1 and a first detection device Q1.

[0074] The first shunt R1 is connected to the first battery U1 and / or the second battery U2.

[0075] The first detection device Q1 is connected to the first shunt R1 and is configured to detect the current flowing through the first battery U1 and / or the second battery U2 based on the first shunt R1.

[0076] like Figure 2 As shown, the first current detector T1 may include a first shunt resistor R1 and a first detection device Q1 connected in parallel. The first terminal of the first shunt resistor R1 is the first terminal A of the first current detector T1. The first shunt resistor R1 may be, for example, a shunt resistor. The first detection device Q1 may be a current detection device (e.g., an ammeter), a voltage detection device (e.g., a voltmeter, a voltage sampling circuit), etc.

[0077] In the example where the first shunt resistor R1 is used and the first detection device Q1 is used as a current detection device, assuming the resistance of the shunt resistor is R, the internal resistance of the current detection device is Ri, and the current detected by the current detection device (i.e., the current flowing through the current detection device) is I0, since the shunt resistor and the current detection device are connected in parallel, the sum of the current I flowing through the first battery U1 and / or the second battery U2 (i.e., the current I1 flowing through the shunt resistor and the current I0 flowing through the current detection device) can be calculated using the following formula: I = I1 + I0 = I0 × (Ri / R) + I0.

[0078] In the example where the first shunt resistor R1 is used and the first detection device Q1 is used as a voltage detection device, assuming the resistance of the shunt resistor is R, the voltage detected by the voltage detection device (i.e., the voltage across the shunt resistor) is U0, and the current I flowing through the first battery U1 and / or the second battery U2, which is the current flowing through the shunt resistor, can be calculated using the following formula: I=U0 / R.

[0079] By using a shunt and a corresponding detection device, accurate current sampling can be achieved, reducing detection errors.

[0080] According to some embodiments of this application, the first detection device Q1 includes a first detection channel (not shown) and a second detection channel (not shown). At least one of the first detection channel and the second detection channel is connected to the first splitter R1.

[0081] To achieve redundant detection, a first detection device Q1 with multiple detection channels can be used. In one example, the first detection device Q1 is a sampling circuit, where the detection channels can be sampling channels, such as sampling elements or operational amplifiers. The sampling channels transmit the acquired data to a processor or controller for analysis. In one example, both detection channels of the first detection device Q1 are connected to the first shunt R1, enabling current sampling and detection. If one detection channel malfunctions and cannot perform detection, current sampling and detection can still be achieved through the other detection channel.

[0082] Using a detection device with two detection channels enables redundant detection, allowing current sampling to be performed even if one detection channel malfunctions, thus improving the reliability of the battery system.

[0083] According to some embodiments of this application, reference is made to Figure 2 The second current detector T2 includes a second shunt R2 and a second detection device Q2.

[0084] The second shunt R2 is connected in series with the second battery U2.

[0085] The second detection device Q2 is connected to the second shunt R2 and is configured to detect the current flowing through the second battery U2 based on the second shunt R2.

[0086] like Figure 2As shown, similar to the first current detector T1, the second current detector T2 may include a second shunt resistor R2 and a second detection device Q2 connected in parallel. The second shunt resistor R2 may be, for example, a shunt resistor. The second detection device Q2 may be a current detection device (e.g., an ammeter), a voltage detection device (e.g., a voltmeter, a voltage sampling circuit), etc.

[0087] In the example where the second shunt resistor R2 and the second detection device Q2 use a current detection device, assuming the resistance of the shunt resistor is R', the internal resistance of the current detection device is Ri', and the current detected by the current detection device (i.e., the current flowing through the current detection device) is I0', since the shunt resistor and the current detection device are connected in parallel, the current I2 flowing through the second battery U2, which is the sum of the current I1' flowing through the shunt resistor and the current I0' flowing through the current detection device, can be calculated using the following formula: I2=I1'+I0'=I0'×(Ri' / R')+I0'.

[0088] In the example where the second shunt resistor R2 is used and the second detection device Q2 uses a voltage detection device, assuming the resistance of the shunt resistor is R', the voltage detected by the voltage detection device (i.e., the voltage across the shunt resistor) is U0', and the current I2 flowing through the second battery U2, which is the current flowing through the shunt resistor, can be calculated using the following formula: I2=U0' / R'.

[0089] In some embodiments, the battery system 100 may further include a filtering module to implement filtering functions and reduce the impact of high-noise environments (such as high-frequency switching signal interference) on the detection results. Furthermore, the current data obtained by the first detection device Q1 and the second detection device Q2 can be further optimized using software algorithms to reduce the impact of noise and other interference signals on the detection results.

[0090] By using a shunt and a corresponding detection device, accurate current sampling can be achieved, reducing detection errors.

[0091] According to some embodiments of this application, the second detection device Q2 includes a third detection channel (not shown) and a fourth detection channel (not shown). At least one of the third and fourth detection channels is connected to the second splitter R2.

[0092] Similar to the first detection device Q1, the second detection device Q2 may also include multiple detection channels. In one example, the second detection device Q2 is a sampling circuit, where the detection channels can be sampling channels, such as sampling elements, operational amplifiers, etc. The sampling channels transmit the acquired data to a processor or controller for analysis. In one example, both detection channels of the second detection device Q2 are connected to the second shunt R2, enabling current sampling and detection. If one detection channel malfunctions and cannot perform detection, current sampling and detection can still be achieved through the other detection channel.

[0093] Using a detection device with two detection channels enables redundant detection, allowing current sampling to be performed even if one detection channel malfunctions, thus improving the reliability of the battery system.

[0094] According to some embodiments of this application, the battery system 100 also includes a controller (not shown).

[0095] The controller is configured as follows: Both the first switch K1 and the third switch K3 are disconnected; The second switch K2 is closed to output the first voltage.

[0096] Switching the three switches to different states allows the battery system 100 to output different voltages. When the first switch K1 and the third switch K3 are open, and the second switch K2 is closed, the circuit topology of the battery system 100 will be as follows: Figure 3 As shown, the first battery U1 and the second battery U2 are connected in series. In this case, the first voltage output by the battery system 100 will be equal to the sum of the output voltages of the first battery U1 and the second battery U2. For example, when both the first battery U1 and the second battery U2 are batteries that output 400 volts (V), when the first switch K1 and the third switch K3 are open and the second switch K2 is closed, the voltage output by the battery system 100 will be 800V.

[0097] By switching the states of various switches in the battery system, the circuit topology can be changed, enabling flexible adjustment of the output voltage.

[0098] According to some embodiments of this application, the controller is configured to: in response to the second switch K2 being closed and the first switch K1 and the third switch K3 being open, control the first current detector T1 and / or the second current detector T2 to detect the current flowing through the first battery U1 and the second battery U2.

[0099] like Figure 3As shown, when the first switch K1 and the third switch K3 are open and the second switch K2 is closed, the current flowing through the first battery U1 and the second battery U2 is equal because they are connected in series. The first current detector T1 and the second current detector T2 are both connected in series with the first battery U1 and the second battery U2. Therefore, either one can be used for current detection to obtain the current flowing through the first battery U1 and the second battery U2. Even if one current detector malfunctions, the other current detector can be used for current detection. Alternatively, both current detectors can be used together for current detection. The detection data obtained from each current detector can be fused and processed, and intelligent algorithms (such as weighted averaging and outlier removal) can be used to eliminate the influence of noise interference and other errors, further improving the accuracy of current sampling and the robustness of the battery system 100.

[0100] When two batteries are connected in series, both current detectors can detect the current, which can effectively improve the accuracy and reliability of the detection results.

[0101] According to some embodiments of this application, the controller is configured to disconnect the second switch K2 in response to the current flowing through the first battery U1 and the second battery U2 not meeting a preset first current condition.

[0102] The first current condition can be designed according to the application, such as based on battery performance parameters and operating temperature. In one example, the first current condition can be set so that the current flowing through the first battery U1 and the second battery U2 does not exceed a certain current threshold. When the detected current does not meet the first current condition, it indicates that there is some abnormality in the circuit, such as a short circuit or abnormal battery status. At this time, protective measures need to be taken in time to disconnect the second switch K2, thus breaking the circuit.

[0103] When the detected current does not meet the usage requirements, timely disconnection of the corresponding switch can reduce component failures caused by abnormal current and improve the safety of the battery system.

[0104] According to some embodiments of this application, the controller is configured to: Control the second switch K2 to open; Control the first switch K1 and / or the third switch K3 to close, so as to output the second voltage.

[0105] As mentioned above, switching the three switches to different states allows the battery system 100 to output different voltages. When the second switch K2 is open and the first switch K1 and the third switch K3 are closed, the circuit topology of the battery system 100 will be as follows: Figure 4As shown, the first battery U1 and the second battery U2 are connected in parallel. When the output voltages of the first battery U1 and the second battery U2 are equal, the second voltage output by the battery system 100 is equal to the output voltage of the first battery U1 (or the second battery U2). For example, when both the first battery U1 and the second battery U2 are batteries that output 400V, when the second switch K2 is open and the first switch K1 and the third switch K3 are closed, the output voltage of the battery system 100 will be 400V.

[0106] When the second switch K2 is open and only the first switch K1 is closed, the circuit topology of the battery system 100 will be as follows: Figure 5 As shown, only the second battery U2 outputs electrical energy. At this time, the second voltage output by the battery system 100 is the output voltage of the second battery U2. For example, when the second battery U2 is a battery that outputs 400V, when the second switch K2 is open and only the first switch K1 is closed, the voltage output by the battery system 100 will be 400V.

[0107] When the second switch K2 is open and only the third switch K3 is closed, the circuit topology of the battery system 100 will be as follows: Figure 6 As shown, only the first battery U1 outputs electrical energy. At this time, the second voltage output by the battery system 100 is the output voltage of the first battery U1. For example, when the first battery U1 is a battery that outputs 400V, when the second switch K2 is open and only the third switch K3 is closed, the voltage output by the battery system 100 will be 400V.

[0108] By switching the states of various switches in the battery system, the circuit topology can be changed, enabling flexible adjustment of the output voltage.

[0109] According to some embodiments of this application, the controller is configured to: In response to the second switch K2 being open and the first switch K1 and the third switch K3 being closed, the first current detector T1 is controlled to detect the current flowing through the first battery U1 and the second battery U2; Control the second current detector T2 to detect the current flowing through the second battery U2; The current flowing through the first battery U1 is determined based on the current flowing through the first battery U1 and the second battery U2, and the current flowing through the second battery U2.

[0110] like Figure 4As shown, with the second switch K2 open and both the first switch K1 and the third switch K3 closed, the first battery U1 and the second battery U2 are connected in parallel. The current flowing through the first battery U1 and the second battery U2 detected by the first current detector T1 is the sum of the current flowing through the first battery U1 and the current flowing through the second battery U2. The current detected by the second current detector T2 is the current flowing through the second battery U2. Therefore, the current flowing through the first battery U1 can be obtained, which is the difference between the current detected by the first current detector T1 and the current detected by the second current detector T2.

[0111] When two batteries are connected in parallel, the current flowing through each battery can be obtained through two current detectors, improving the accuracy of the detection results.

[0112] According to some embodiments of this application, the controller is configured to: In response to the current flowing through the second battery U2 not meeting the preset second current condition, the first switch K1 is disconnected; In response to the fact that the current flowing through the first battery U1 does not meet the preset third current condition, the third switch K3 is disconnected.

[0113] exist Figure 4 In the illustrated embodiment, since the current flowing through each battery can be determined separately, the faulty branch can be disconnected based on whether the current of each battery meets the preset current conditions.

[0114] Similar to the first current condition, the second and third current conditions can be designed according to the application, such as the battery's performance parameters and operating temperature. The second and third current conditions can be the same or different. In one example, the second current condition can be set such that the current flowing through the second battery U2 does not exceed a certain current threshold, and the third current condition can be set such that the current flowing through the first battery U1 does not exceed a certain current threshold.

[0115] exist Figure 4 In the embodiment shown, when the current flowing through the second battery U2 does not meet the second current condition, it indicates that there is some abnormality in the circuit branch where the second battery U2 is located, such as a short circuit or an abnormal state of the second battery. At this time, it is necessary to take protective measures in time and disconnect the first switch K1 so that the branch is disconnected.

[0116] When the current flowing through the first battery U1 does not meet the third current condition, it indicates that there is some abnormality in the circuit branch where the first battery U1 is located, such as a short circuit or an abnormal state of the first battery. At this time, it is necessary to take protective measures in time and disconnect the third switch K3 so that the branch is disconnected.

[0117] When the detected current does not meet the usage requirements, timely disconnection of the corresponding switch can reduce component failures caused by abnormal current and improve the safety of the battery system.

[0118] According to some embodiments of this application, the controller is configured to: in response to both the second switch K2 and the third switch K3 being open and the first switch K1 being closed, control the first current detector T1 and / or the second current detector T2 to detect the current flowing through the second battery U2.

[0119] As described above, when the second switch K2 is open and only the first switch K1 is closed, the circuit topology of the battery system 100 will be as follows: Figure 5 As shown, only the second battery U2 outputs electrical energy. Both the first current detector T1 and the second current detector T2 are connected in series with the second battery U2. Therefore, either one can be used for current detection to obtain the current flowing through the second battery U2. Even if one current detector malfunctions, the other current detector can be used for current detection, or both current detectors can be used together for current detection.

[0120] In some embodiments, when the first battery U1 malfunctions and cannot output power, the circuit topology of the battery system 100 will also be as follows: Figure 5 As shown, at this time only the second battery U2 outputs electrical energy, and the first current detector T1 and / or the second current detector T2 can also be controlled to detect the current flowing through the second battery U2.

[0121] When only the second battery is outputting, both current detectors can perform current detection, which can effectively improve the accuracy and reliability of the detection results.

[0122] According to some embodiments of this application, the controller is configured to disconnect the first switch K1 in response to the current flowing through the second battery U2 not meeting a preset fourth current condition.

[0123] The fourth current condition can also be designed according to the application, such as determining it based on battery performance parameters and operating temperature. In one example, the fourth current condition can be set so that the current flowing through the second battery U2 does not exceed a certain current threshold. Figure 5 In the embodiment shown, when the detected current does not meet the fourth current condition, it indicates that there is some abnormality in the circuit, such as a short circuit or an abnormal state of the second battery. At this time, it is necessary to take protective measures in time, disconnect the first switch K1, and disconnect the circuit.

[0124] When the detected current does not meet the usage requirements, timely disconnection of the corresponding switch can reduce component failures caused by abnormal current and improve the safety of the battery system.

[0125] According to some embodiments of this application, the controller is configured to: in response to the first switch K1 and the second switch K2 both being open and the third switch K3 being closed, control the first current detector T1 to detect the current flowing through the first battery U1.

[0126] As described above, when the second switch K2 is open and only the third switch K3 is closed, the circuit topology of the battery system 100 will be as follows: Figure 6 As shown, only the first battery U1 outputs electrical energy. The first current detector T1 is connected in series with the first battery U1, and can be used to detect the current flowing through the first battery U1.

[0127] In some embodiments, when the second battery U2 malfunctions and cannot output power, the circuit topology of the battery system 100 will also be as follows: Figure 6 As shown, at this time only the first battery U1 outputs electrical energy, and the first current detector T1 can also be controlled to detect the current flowing through the first battery U1.

[0128] When only the first battery is outputting, current can be detected by the first current detector, enabling current detection under different conditions and achieving a redundant design for current detection.

[0129] According to some embodiments of this application, the controller is configured to disconnect the third switch K3 in response to the current flowing through the first battery U1 not meeting a preset fifth current condition.

[0130] The fifth current condition can also be designed according to the application, such as determining it based on battery performance parameters and operating temperature. In one example, the fifth current condition can be set so that the current flowing through the first battery U1 does not exceed a certain current threshold. Figure 6 In the embodiment shown, when the detected current does not meet the fifth current condition, it indicates that there is some abnormality in the circuit, such as a short circuit or an abnormal state of the first battery. At this time, it is necessary to take protective measures in time, such as disconnecting the third switch K3 to disconnect the circuit.

[0131] In some embodiments, adaptive algorithms can be used to achieve rapid response to current anomalies. For example, when a current signal is detected to be inconsistent with a preset current condition, the controller can disconnect the corresponding switch within milliseconds, reducing the risk of the fault escalating.

[0132] When the detected current does not meet the usage requirements, timely disconnection of the corresponding switch can reduce component failures caused by abnormal current and improve the safety of the battery system.

[0133] According to some embodiments of this application, the controller is configured to determine the state of the first current detector T1 and / or the second current detector T2.

[0134] The controller can also perform self-testing for the first current detector T1 and / or the second current detector T2. By determining the status of the first current detector T1 and / or the second current detector T2, such as detecting whether there is a short circuit, open circuit, or abnormal detection accuracy, it determines whether the status of the first current detector T1 and / or the second current detector T2 is normal and whether current detection can be performed. When the status is abnormal, the current detection is stopped in time or the detection data obtained under abnormal status is discarded.

[0135] By monitoring the status of the current detector, potential faults can be identified in a timely manner, reducing detection errors caused by current detector malfunctions and decreasing the frequency of manual inspection and maintenance.

[0136] According to some embodiments of this application, reference is made to Figure 7 The battery system 100 also includes a first protector F1 and a second protector F2.

[0137] The first protector F1 is connected between the positive terminal of the first battery U1 and the positive terminal of the second battery U2, and is connected in series with the first switch K1. The first protector F1 is configured to provide overcurrent protection to the battery system 100.

[0138] The second protector F2 is connected between the negative terminals of the first battery U1 and the second battery U2, and is connected in series with the third switch K3. The second protector F2 is configured to provide overcurrent protection to the battery system 100.

[0139] like Figure 7 As shown, a protector may also be provided in the battery system 100. The protector may include, for example, a fuse or circuit breaker. When the current in the circuit is too high, the protector will melt and disconnect the circuit.

[0140] exist Figure 7 In the illustrated embodiment, when the first switch K1 is closed, if the current flowing through the second battery U2 is too large, the first protector F1 will melt and disconnect the branch containing the second battery U2. When the third switch K3 is closed, if the current flowing through the first battery U1 is too large, the second protector F2 will melt and disconnect the branch containing the first battery U1.

[0141] By installing a protector in the battery system, the risk of damage to the battery system due to abnormal current can be reduced, thereby improving the safety of the battery system.

[0142] Based on the same technical concept, this application provides a control method for a battery system, used in the battery system described above. (Reference) Figure 8 The battery system control method 800 includes steps 810 to 820.

[0143] Step 810: Control both the first switch K1 and the third switch K3 to be disconnected.

[0144] Step 820: Control the second switch K2 to close, so as to output the first voltage.

[0145] The embodiment of the control method 800 for the battery system can refer to the embodiment of the battery system 100, and the repeated parts will not be described again.

[0146] By switching the states of various switches in the battery system, the circuit topology can be changed, enabling flexible adjustment of the output voltage.

[0147] According to some embodiments of this application, the control method further includes: in response to the second switch K2 being closed and the first switch K1 and the third switch K3 being open, controlling the first current detector T1 and / or the second current detector T2 to detect the current flowing through the first battery U1 and the second battery U2.

[0148] When two batteries are connected in series, both current detectors can detect the current, which can effectively improve the accuracy and reliability of the detection results.

[0149] According to some embodiments of this application, the control method further includes a first process 900. (See reference...) Figure 9 The first process 900 includes steps 910 to 920.

[0150] Step 910: Control the second switch K2 to disconnect.

[0151] Step 920: Control the first switch K1 and / or the third switch K3 to close to output the second voltage.

[0152] By switching the states of various switches in the battery system, the circuit topology can be changed, enabling flexible adjustment of the output voltage.

[0153] According to some embodiments of this application, the control method further includes: In response to the second switch K2 being open and the first switch K1 and the third switch K3 being closed, the first current detector T1 is controlled to detect the current flowing through the first battery U1 and the second battery U2; Control the second current detector T2 to detect the current flowing through the second battery U2; The current flowing through the first battery U1 is determined based on the current flowing through the first battery U1 and the second battery U2, and the current flowing through the second battery U2.

[0154] When two batteries are connected in parallel, the current flowing through each battery can be obtained through two current detectors, improving the accuracy of the detection results.

[0155] According to some embodiments of this application, the control method further includes: in response to the second switch K2 and the third switch K3 both being open and the first switch K1 being closed, controlling the first current detector T1 and / or the second current detector T2 to detect the current flowing through the second battery U2.

[0156] When only the second battery is outputting, both current detectors can perform current detection, which can effectively improve the accuracy and reliability of the detection results.

[0157] According to some embodiments of this application, the control method further includes: in response to the first switch K1 and the second switch K2 both being open and the third switch K3 being closed, controlling the first current detector T1 to detect the current flowing through the first battery U1.

[0158] When only the first battery is outputting, current can be detected by the first current detector, enabling current detection under different conditions and achieving a redundant design for current detection.

[0159] According to some embodiments of this application, the control method further includes: determining the state of the first current detector T1 and / or the second current detector T2.

[0160] By monitoring the status of the current detector, potential faults can be identified in a timely manner, reducing detection errors caused by current detector malfunctions and decreasing the frequency of manual inspection and maintenance.

[0161] A specific embodiment of this application is described below. It should be understood that this specific embodiment is described for illustrative purposes only and should not be construed as limiting the scope of this application.

[0162] like Figure 1 , Figure 2 and Figure 7 As shown, the battery system 100 includes a first battery U1, a second battery U2, a first switch K1, a second switch K2, a third switch K3, a first current detector T1, a second current detector T2, a first protector F1, a second protector F2, and a controller. The first current detector T1 includes a first shunt R1 and a first detection device Q1 connected in parallel. The second current detector T2 includes a second shunt R2 and a second detection device Q2 connected in parallel.

[0163] The first switch K1 is connected between the positive terminal of the first battery U1 and the positive terminal of the second battery U2. The second switch K2 is connected between the negative terminal of the first battery U1 and the positive terminal of the second battery U2. The third switch K3 is connected between the negative terminals of the first battery U1 and the negative terminals of the second battery U2. The first terminal A of the first current detector T1 is connected to the negative terminal of the second battery U2. The second current detector T2 is connected between the negative terminal of the second battery U2 and the first terminal A of the first current detector T1. The first protector F1 is connected between the positive terminals of the first battery U1 and the positive terminals of the second battery U2, and is connected in series with the first switch K1. The second protector F2 is connected between the negative terminals of the first battery U1 and the negative terminals of the second battery U2, and is connected in series with the third switch K3.

[0164] The controller can control the state switching of each switch. When the controller controls the first switch K1 and the third switch K3 to open and the second switch K2 to close, the circuit topology of the battery system 100 will be as follows: Figure 3 As shown, the first battery U1 and the second battery U2 are connected in series. The first voltage output by the battery system 100 will be equal to the sum of the output voltages of the first battery U1 and the second battery U2. Since the first battery U1 and the second battery U2 are connected in series, the current flowing through the two batteries is equal. Any single current detector can be used to detect the current flowing through the first battery U1 and the second battery U2, or two current detectors can be used together to detect the current, and the detection data obtained from each current detector can be fused. When the current flowing through the first battery U1 and the second battery U2 does not meet the preset first current condition, the second switch K2 will be disconnected.

[0165] When the controller controls the second switch K2 to open and the first switch K1 and the third switch K3 to close, the circuit topology of the battery system 100 will be as follows: Figure 4 As shown, the first battery U1 and the second battery U2 are connected in parallel. When the output voltages of the first battery U1 and the second battery U2 are equal, the second voltage output by the battery system 100 is equal to the output voltage of the first battery U1 (or the second battery U2). Since the first battery U1 and the second battery U2 are connected in parallel, the current flowing through the first battery U1 and the second battery U2 detected by the first current detector T1 is the sum of the current flowing through the first battery U1 and the current flowing through the second battery U2. The current detected by the second current detector T2 is the current flowing through the second battery U2. The current flowing through the first battery U1 is the difference between the current detected by the first current detector T1 and the current detected by the second current detector T2. When the current flowing through the second battery U2 does not meet the preset second current condition, the first switch K1 is disconnected. When the current flowing through the first battery U1 does not meet the preset third current condition, the third switch K3 is disconnected.

[0166] When the controller opens the second switch K2 and the third switch K3 and closes the first switch K1, the circuit topology of the battery system 100 will be as follows: Figure 5 As shown, only the second battery U2 outputs electrical energy. Any single current detector can be used to detect the current flowing through the second battery U2, or two current detectors can be used together to detect the current, and the detection data from each current detector can be fused. When the current flowing through the second battery U2 does not meet the preset fourth current condition, the first switch K1 is disconnected.

[0167] When the controller opens the first switch K1 and the second switch K2 and closes the third switch K3, the circuit topology of the battery system 100 will be as follows: Figure 6 As shown, only the first battery U1 outputs electrical energy. The first current detector T1 is connected in series with the first battery U1, and can be used to detect the current flowing through the first battery U1. When the current flowing through the first battery U1 does not meet the preset fifth current condition, the third switch K3 is disconnected.

[0168] 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 system, characterized in that, include: The first battery is configured to output electrical energy; The second battery is configured to output electrical energy; A first switch is connected between the positive terminal of the first battery and the positive terminal of the second battery, and the first switch is configured to selectively conduct the positive terminals of the first battery and the second battery. A second switch is connected between the negative terminal of the first battery and the positive terminal of the second battery, and the second switch is configured to selectively conduct the negative terminal of the first battery and the positive terminal of the second battery. A third switch is connected between the negative terminal of the first battery and the negative terminal of the second battery, and the third switch is configured to selectively conduct the negative terminals of the first battery and the second battery. A first current detector, connected to the first battery and / or the second battery, is configured to perform at least one of the following: When the second switch is closed and both the first switch and the third switch are open, the current flowing through the first battery and the second battery is detected; When the second switch is open and both the first switch and the third switch are closed, the current flowing through the first battery and the second battery is detected; When both the second switch and the third switch are open and the first switch is closed, the current flowing through the second battery is detected; When both the first switch and the second switch are open and the third switch is closed, the current flowing through the first battery is detected; as well as A second current detector, connected in series with the second battery, is configured to detect the current flowing through the second battery, wherein... The first current detector includes: A first shunt, the first shunt being connected to the first battery and / or the second battery; and A first detection device is connected to the first shunt and configured to detect the current flowing through the first battery and / or the second battery based on the first shunt. The first detection device includes a first detection channel and a second detection channel, at least one of the first detection channel and the second detection channel being connected to the first shunt.

2. The battery system according to claim 1, characterized in that, The first current detector is connected to the negative terminal of the second battery or the positive terminal of the first battery.

3. The battery system according to claim 1 or 2, characterized in that, The second current detector is connected between the second battery and the first current detector, and the third switch is connected in parallel with the second switch, the second battery and the second current detector that are connected in series.

4. The battery system according to claim 1 or 2, characterized in that, The first current detector is connected to both the negative terminal of the second battery and the third switch. The second current detector is connected between the negative terminal of the second battery and the first current detector, and also between the negative terminal of the second battery and the third switch.

5. The battery system according to claim 1 or 2, characterized in that, The second current detector includes: A second shunt is connected in series with the second battery; and A second detection device is connected to the second shunt and configured to detect the current flowing through the second battery based on the second shunt.

6. The battery system according to claim 5, characterized in that, The second detection device includes a third detection channel and a fourth detection channel, at least one of which is connected to the second splitter.

7. The battery system according to claim 1 or 2, characterized in that, The battery system also includes: The controller is configured as follows: Control both the first switch and the third switch to be open; and The second switch is controlled to close, so as to output the first voltage.

8. The battery system according to claim 7, characterized in that, The controller is configured to: In response to the second switch being closed and both the first switch and the third switch being open, the first current detector and / or the second current detector are controlled to detect the current flowing through the first battery and the second battery.

9. The battery system according to claim 8, characterized in that, The controller is configured to: In response to the current flowing through the first battery and the second battery not meeting a preset first current condition, the second switch is disconnected.

10. The battery system according to claim 7, characterized in that, The controller is configured to: Control the second switch to open; and Control the first switch and / or the third switch to close to output a second voltage.

11. The battery system according to claim 10, characterized in that, The controller is configured to: In response to the second switch being open and both the first switch and the third switch being closed, the first current detector is controlled to detect the current flowing through the first battery and the second battery; The second current detector is controlled to detect the current flowing through the second battery; as well as The current flowing through the first battery is determined based on the current flowing through the first battery and the second battery, and the current flowing through the second battery.

12. The battery system according to claim 11, characterized in that, The controller is configured to: In response to the current flowing through the second battery not meeting a preset second current condition, the first switch is disconnected; and In response to the current flowing through the first battery not meeting a preset third current condition, the third switch is disconnected.

13. The battery system according to claim 10, characterized in that, The controller is configured to: In response to both the second switch and the third switch being open and the first switch being closed, the first current detector and / or the second current detector are controlled to detect the current flowing through the second battery.

14. The battery system according to claim 13, characterized in that, The controller is configured to: In response to the current flowing through the second battery not meeting a preset fourth current condition, the first switch is disconnected.

15. The battery system according to claim 10, characterized in that, The controller is configured to: In response to both the first switch and the second switch being open and the third switch being closed, the first current detector is controlled to detect the current flowing through the first battery.

16. The battery system according to claim 15, characterized in that, The controller is configured to: In response to the current flowing through the first battery not meeting the preset fifth current condition, the third switch is disconnected.

17. The battery system according to claim 7, characterized in that, The controller is configured to: Determine the state of the first current detector and / or the second current detector.

18. The battery system according to claim 1 or 2, characterized in that, The battery system also includes: A first protector is connected between the positive terminals of the first battery and the second battery, and is connected in series with the first switch. The first protector is configured to provide overcurrent protection to the battery system. A second protector is connected between the negative terminals of the first battery and the second battery, and is connected in series with the third switch. The second protector is configured to provide overcurrent protection to the battery system.

19. A control method for a battery system, used in the battery system of claim 1, characterized in that, include: Both the first switch and the third switch are disconnected. as well as The second switch is controlled to close, so as to output the first voltage.

20. The control method according to claim 19, characterized in that, Also includes: In response to the second switch being closed and both the first switch and the third switch being open, the first current detector and / or the second current detector are controlled to detect the current flowing through the first battery and the second battery.

21. The control method according to claim 19, characterized in that, Also includes: The second switch is turned off. as well as Control the first switch and / or the third switch to close to output a second voltage.

22. The control method according to claim 21, characterized in that, Also includes: In response to the second switch being open and both the first switch and the third switch being closed, the first current detector is controlled to detect the current flowing through the first battery and the second battery; The second current detector is controlled to detect the current flowing through the second battery; as well as The current flowing through the first battery is determined based on the current flowing through the first battery and the second battery, and the current flowing through the second battery.

23. The control method according to claim 21, characterized in that, Also includes: In response to both the second switch and the third switch being open and the first switch being closed, the first current detector and / or the second current detector are controlled to detect the current flowing through the second battery.

24. The control method according to claim 21, characterized in that, Also includes: In response to both the first switch and the second switch being open and the third switch being closed, the first current detector is controlled to detect the current flowing through the first battery.

25. The control method according to claim 19, characterized in that, Also includes: Determine the state of the first current detector and / or the second current detector.

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