Charging mode interlocking circuit of battery system and battery system

Abstract

The utility model relates to the technical field of electric automobiles, and discloses a charging mode interlocking circuit of a battery system and the battery system, in the circuit, a contactor is respectively connected with a positive electrode of a battery pack, different charging mode interfaces of the battery system and a switch control module; the contactor control module is connected with the cathode of the battery pack, the contactor and the switch control module; when any specified charging mode of the battery system is selected for charging, the contactor control module controls the contactor to control the on-off of a battery system loop in the specified charging mode through the specified charging mode interface, and controls the switch control module to interlock and switch other charging modes except the specified charging mode. According to the utility model, under different charging modes of the battery system, when one charging mode is used for charging, other charging modes are interlocked and switched, and the risk that interfaces of other charging modes have high voltage due to false start of a contactor is prevented.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle technology, specifically to a charging mode interlock circuit for a battery system and a battery system. Background Technology

[0002] Currently, with the development and popularization of electric vehicles, people have put forward higher requirements for the range and charging speed of electric vehicles. In order to meet the requirements of longer range, the battery system increases the total battery capacity. However, the increased capacity also brings the disadvantage of longer charging time. To solve this problem, improve charging speed, and adapt to conventional charging facilities, the main solution is to use an 800V battery system with different charging modes. The 800V battery system solution increases the voltage by a factor of two, increases the total charging power, and adapts to different charging manufacturers and charging facilities for electric vehicles. At the same time, the battery system needs to add control loops for multiple charging modes.

[0003] Typical charging modes include: Mode 1, which is used for electric vehicles with an 800V voltage platform. To adapt to the current common charging piles with a 400V voltage platform, Mode 1 is adopted, which is essentially an upgrade to 800V voltage to meet the charging needs of the battery system of electric vehicles with an 800V voltage platform. Second, Mode 2 is introduced, which uses two charging guns to charge the battery system simultaneously, significantly increasing the battery charging power and shortening the battery charging time. Third, pantograph-mounted charging mode is introduced, which uses the top of the pantograph to charge, allowing for rapid replenishment of the battery system when no charging pile is available. When multiple different charging modes exist inside the battery, there is a possibility of misoperation and accidental activation. For example, if the battery system accidentally activates Mode 2 while in Mode 1, but the two charging guns are not connected, the Mode 2 interface of the battery system may have a high voltage risk, potentially leading to electric shock, short circuit, or fire hazards.

[0004] Existing technologies mostly rely on physical protection, such as adding protective measures to the charging interface of the battery system, including protective covers and protective plastic sleeves, to prevent water ingress, accidental contact, and other potential hazards.

[0005] Current technology has several typical drawbacks. Physical protection methods cannot fundamentally solve the problem of high voltage at the charging port; the high voltage still exists. Current technology requires additional components, and these components are at risk of failure and detachment over long-term durability. When different charging modes coexist within the electric vehicle battery system, if one charging mode is used and the others are mistakenly activated, high voltage may be present at the charging interface, potentially causing safety risks such as insulation failure, electric shock, water ingress, and fire. Utility Model Content

[0006] In view of this, the present invention provides a charging mode interlock circuit and battery system for a battery system, in order to solve the safety risks such as insulation failure, electric shock, water ingress and fire caused by the accidental activation of other charging modes when different charging modes coexist in the battery system of an electric vehicle, when one charging mode is used.

[0007] In a first aspect, this utility model provides a charging mode interlock circuit for a battery system, the circuit comprising: a battery management system, a contactor, and a switch control module; the battery management system includes a contactor control module.

[0008] The contactors are connected to the different charging mode interfaces of the battery system and the switch control module, and the contactor control module is connected to the contactors and the switch control module respectively.

[0009] When the battery system is charged in any specified charging mode, the contactor control module controls the contactor to control the circuit opening and closing in the specified charging mode through the specified charging mode interface, and controls the switch control module to interlock and switch other charging modes besides the specified charging mode.

[0010] The battery system charging mode interlock circuit provided by this utility model connects different charging mode interfaces of the battery system and a switch control module via contactors. The contactor control module is connected to both the contactors and the switch control module. When any specified charging mode of the battery system is selected for charging, the contactor control module controls the contactor to control the circuit opening and closing of the specified charging mode through the specified charging mode interface, and controls the switch control module to interlock and switch other charging modes besides the specified charging mode. The above hardware circuit control achieves the purpose of interlocking and switching other charging modes besides the specified charging mode through the switch control module when using one charging mode. This prevents the contactor from accidentally starting and causing other charging mode interfaces to carry high voltage, improves the safety of the battery system, prevents electric shock, and solves the safety risks such as insulation failure, electric shock, and water ingress and fire caused by the accidental activation of other charging modes when one charging mode is used simultaneously in the electric vehicle battery system.

[0011] In one alternative implementation, the contactor includes a first contactor and a second contactor, and the different charging mode interfaces of the battery system include a first charging mode interface and a second charging mode interface.

[0012] The first contactor controls the on / off state of the first charging mode through the first charging mode interface; the second contactor controls the on / off state of the second charging mode through the second charging mode interface.

[0013] The battery system charging mode interlock circuit provided by this utility model has a first contactor that controls the on / off state of the first charging mode through a first charging mode interface, and a second contactor that controls the on / off state of the second charging mode through a second charging mode interface. This achieves the purpose of controlling the charging mode of the battery system by the contactor hardware, and eliminates the potential risks of electromagnetic interference and software defects affecting the software.

[0014] In one optional embodiment, both the first contactor and the second contactor include a first coil, and the switch control module includes a first single-pole double-throw switch and a second single-pole double-throw switch. The first single-pole double-throw switch is connected to the coil of the first contactor, and the second single-pole double-throw switch is connected to the coil of the second contactor.

[0015] The charging mode interlock circuit of the battery system provided by this utility model connects the coil of the first contactor to the first single-pole double-throw switch and the coil of the second contactor to the second single-pole double-throw switch, thereby realizing the purpose of connecting the contactor and the switch control module and providing conditions for the subsequent interlocking and switching of the charging mode of the battery system.

[0016] In one alternative implementation, the first and second contactors further include contacts S and A, and the circuit also includes a main fuse.

[0017] The main fuse is connected to the contact S of the first contactor, and the A contact of the first contactor is connected to the positive terminal of the first charging mode interface to form the first branch.

[0018] The main fuse is also connected to the contact S of the second contactor, and the A contact of the second contactor is connected to the positive terminal of the second charging mode interface to form the second branch.

[0019] The first branch and the second circuit form a high-voltage connection circuit.

[0020] The charging mode interlock circuit of the battery system provided by this utility model is connected to the first contactor and the second contactor through the main fuse, which realizes the purpose of protecting the first contactor and the second contactor from charging short circuit current. The high-voltage connection circuit formed provides the conditions for the interlocking and switching of the first charging mode and the second charging mode.

[0021] In one optional embodiment, both the first single-pole double-throw switch and the second single-pole double-throw switch include a second coil, a contact S, and a contact A; the contactor control module includes a first voltage pin, a second voltage pin, and a third voltage pin; both the first coil and the second coil include a 12V+ pin and a 12V- pin.

[0022] The first voltage pin is connected to the 12V- pins of the second coil of the first single-pole double-throw switch, the second coil of the second single-pole double-throw switch, the first coil of the first contactor, and the first coil of the second contactor to form the third branch.

[0023] The second voltage pin is connected to contact A of the second single-pole double-throw switch. Contact S of the second single-pole double-throw switch is connected to the 12V+ pin of the second coil of the first single-pole double-throw switch and the 12V+ pin of the first coil of the second contactor to form the fourth branch.

[0024] The third voltage pin is connected to contact A of the first single-pole double-throw switch. Contact S of the first single-pole double-throw switch is connected to the 12V+ pin of the second coil of the second single-pole double-throw switch and the 12V+ pin of the first coil of the first contactor to form the fifth branch.

[0025] The third, fourth, and fifth branches constitute a low-voltage connection circuit.

[0026] The charging mode interlock circuit of the battery system provided by this utility model achieves hard-wired interlock between different charging modes by connecting the contactor control module to the first contactor, the second contactor, the first single-pole double-throw switch, and the second single-pole double-throw switch respectively. In principle, it solves the problem of high voltage at the charging mode interface after accidental start-up and achieves the goal of not having high voltage at the charging mode interface, thereby improving the safety of the battery system.

[0027] In an alternative implementation, the switch control module is replaced by a combination of MOS switches.

[0028] In one alternative implementation, the circuit further includes a shunt connected to the negative terminal of the first charging mode interface and the negative terminal of the second charging mode interface, respectively.

[0029] In one optional implementation, the shunt further includes a shunt communication module, and the battery management system further includes a current acquisition module and a charging communication module. The shunt communication module is connected to the current acquisition module, and the charging communication module is connected to the communication module of an external charger.

[0030] The battery system charging mode interlock circuit provided by this utility model realizes the purpose of charging current detection under different charging modes through the shunt, and realizes communication between the shunt, the battery management system and the charger through the shunt communication module, the charging communication module and the charger communication module, thus providing communication conditions for interlocking different charging modes in the circuit.

[0031] Secondly, this utility model provides a battery system, including the charging mode interlock circuit of the battery system according to the first aspect or any corresponding embodiment, and a battery pack, wherein the positive terminal of the battery pack is connected to a contactor in the charging mode interlock circuit of the battery system, and the negative terminal of the battery pack is connected to a contactor control module in the charging mode interlock circuit of the battery system.

[0032] In one alternative implementation, the positive terminal of the battery pack is connected to the main fuse in the charging mode interlock circuit of the battery system; the negative terminal of the battery pack is connected to the shunt in the charging mode interlock circuit of the battery system. Attached Figure Description

[0033] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 This is a structural block diagram of the charging mode interlock circuit of the battery system according to an embodiment of the present utility model;

[0035] Figure 2 This is a schematic diagram of the charging mode interlock circuit of the battery system according to an embodiment of the present utility model;

[0036] Figure 3 This is a schematic diagram of the contactor according to an embodiment of the present utility model;

[0037] Figure 4 This is a schematic diagram of the switch control module according to an embodiment of the present utility model;

[0038] Figure 5 This is a schematic diagram of the charging mode interlock circuit of another battery system according to an embodiment of the present invention;

[0039] Figure 6 This is a schematic diagram of the charging mode interlock circuit of another battery system according to an embodiment of the present utility model;

[0040] Figure 7 This is a structural block diagram of a battery system according to an embodiment of the present utility model. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0042] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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 also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0044] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0045] According to an embodiment of the present invention, a charging mode interlock circuit for a battery system is provided. Figure 1 This is a structural block diagram of the charging mode interlock circuit of the battery system according to an embodiment of the present invention, as shown below. Figure 1 As shown, the circuit includes a battery management system, contactors, and a switch control module. The battery management system includes a contactor control module. The contactors are connected to different charging mode interfaces of the battery system and the switch control module, respectively. The contactor control module is connected to both the contactors and the switch control module. When any specified charging mode of the battery system is selected for charging, the contactor control module controls the contactors to control the on / off state of the battery system circuit under the specified charging mode through the specified charging mode interface, and controls the switch control module to interlock and switch between other charging modes besides the specified charging mode.

[0046] in:

[0047] The battery system consists of battery packs, electrical compartments, battery management systems, etc., and can be charged and discharged. It is the core power source of electric vehicles.

[0048] Charging mode interlock means that when the battery system is in charging mode A, it cannot enter charging mode B, and when the battery system is in charging mode B, it cannot enter charging mode A. In other words, the two charging modes A and B are interlocked.

[0049] A battery pack is composed of multiple battery cells connected in series and parallel in different ways.

[0050] A contactor is used to control the on / off state of the battery system circuit under different charging modes.

[0051] The switch control module uses a single-pole double-throw switch (SPDS) to connect with the contactor coil, thereby achieving interlocking and switching between different charging modes. A SPDS refers to a protection switching device with two sets of switches existing simultaneously: one normally closed and the other normally open. It has three contacts: S, A, and B, controlled by a coil. In the static state, when the coil is not energized, contacts S and A are connected, forming a normally closed state, while contacts A and B are open, forming a normally open state. When the coil is energized, the contact blade switches from moving contact A to moving contact B, contacts S and A are open, and contacts S and B are connected, breaking the normally closed circuit and closing the normally open circuit. In this embodiment, the SPDS can be replaced by a combination of MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) switches.

[0052] The Battery Management System (BMS) consists of a contactor control module, a current detection module, and a charging communication module. The contactor control module receives charging commands and controls the contactors to control the on / off state of the battery system circuit under different charging modes.

[0053] The charging mode interlock circuit for the battery system provided in this embodiment connects different charging mode interfaces of the battery system and a switch control module via contactors. The contactor control module is connected to both the contactors and the switch control module. When any specified charging mode of the battery system is selected for charging, the contactor control module controls the contactor to control the circuit opening and closing under the specified charging mode through the specified charging mode interface, and controls the switch control module to interlock and switch other charging modes besides the specified charging mode. The above hardware circuit control achieves the purpose of interlocking and switching other charging modes besides the specified charging mode through the switch control module when using one charging mode under different charging modes of the battery system. This prevents the contactor from being accidentally activated, which could lead to high voltage at other charging mode interfaces, improves the safety of the battery system, prevents electric shock, and solves the safety risks such as insulation failure, electric shock, and water ingress and fire caused by the accidental activation of other charging modes when one charging mode is used, when different charging modes coexist inside the electric vehicle battery system.

[0054] In one optional implementation, the contactor includes a first contactor and a second contactor, and the battery system's different charging mode interfaces include a first charging mode interface and a second charging mode interface; the first contactor controls the on / off state of the first charging mode through the first charging mode interface; and the second contactor controls the on / off state of the second charging mode through the second charging mode interface.

[0055] Specifically, such as Figure 2 As shown, the contactor includes a first contactor KM1 and a second contactor KM2. The battery system's different charging mode interfaces include a first charging mode (i.e., Figure 2 Charging mode 1) interface (i.e. Figure 2 The charging mode 1 interface) and the second charging mode (i.e. Figure 2 Charging mode 2) interface (i.e. Figure 2 The charging mode 2 interface is used; wherein, the first contactor KM1 is the charging mode 1 contactor KM1, which controls the on / off of the charging mode 1 circuit through the charging mode 1 interface; the second contactor KM2 is the charging mode 2 contactor KM2, which controls the on / off of the charging mode 2 circuit through the charging mode 2 interface.

[0056] In one optional embodiment, both the first contactor and the second contactor include a first coil, and the switch control module includes a first single-pole double-throw switch and a second single-pole double-throw switch. The first single-pole double-throw switch is connected to the coil of the first contactor, and the second single-pole double-throw switch is connected to the coil of the second contactor.

[0057] Specifically, such as Figure 3 As shown, both the first contactor KM1 and the second contactor KM2 include a first coil (i.e., coil 12V+ and coil 12V-). Figure 2 As shown, the switch control module adopts a single-pole double-throw switch, including a first single-pole double-throw switch K1 and a second single-pole double-throw switch K2. The first single-pole double-throw switch K1 is connected to the coil of the first contactor KM1, and the second single-pole double-throw switch K2 is connected to the coil of the second contactor KM2, thereby realizing the interlocking and switching of different charging modes.

[0058] In one optional embodiment, the first contactor and the second contactor further include contacts S and A, and the circuit also includes a main fuse; the main fuse is connected to contact S of the first contactor, and contact A of the first contactor is connected to the positive terminal of the first charging mode interface to form a first branch; the main fuse is also connected to contact S of the second contactor, and contact A of the second contactor is connected to the positive terminal of the second charging mode interface to form a second branch; the first branch and the second circuit constitute a high-voltage connection circuit. The circuit also includes a shunt, which is connected to the negative terminal of the first charging mode interface and the negative terminal of the second charging mode interface, respectively.

[0059] like Figure 3 As shown, the first contactor KM1 and the second contactor KM2 also include contact S and contact A. (As...) Figure 2 As shown, the circuit also includes a main fuse and a shunt. The main fuse is used to protect against charging short-circuit current, and the shunt is used to detect charging current under different charging modes.

[0060] The high-voltage connection circuit of this utility model embodiment is connected as follows: one end of the main fuse is connected to the positive terminal of the battery pack in the battery system, and the other end of the main fuse is connected to the contact S of the first contactor KM1. The A contact of the first contactor is connected to the positive terminal of the charging mode 1 interface. The other end of the main fuse is also connected to the contact S of the second contactor KM2. The A contact of the second contactor is connected to the positive terminal of the charging mode 2 interface. In other words, the first contactor KM1 and the second contactor KM2 are connected in parallel and then in series with the main fuse and the battery pack. The first end of the shunt is connected to the negative terminal of the battery pack in the battery system, and the second end of the shunt is connected to the negative terminals of the charging mode 1 interface and the charging mode 2 interface, respectively. In other words, the shunt is first connected in series with the battery pack and then connected to the negative terminals of the charging mode 1 interface and the charging mode 2 interface. The charging mode 1 interface and the charging mode 2 interface are connected in parallel.

[0061] In one optional embodiment, both the first single-pole double-throw switch and the second single-pole double-throw switch include a second coil, a contact S, and a contact A; the contactor control module includes a first voltage pin, a second voltage pin, and a third voltage pin; both the first coil and the second coil include a coil 12V+ pin and a coil 12V- pin; the first voltage pin is connected to the coil 12V- pin of the second coil of the first single-pole double-throw switch, the coil 12V- pin of the second coil of the second single-pole double-throw switch, the coil 12V- pin of the first coil of the first contactor, and the coil 12V- pin of the first coil of the second contactor to form the first single-pole double-throw switch. The circuit consists of three branches: the second voltage pin is connected to contact A of the second single-pole double-throw switch, and contact S of the second single-pole double-throw switch is connected to the 12V+ coil pin of the second coil of the first single-pole double-throw switch and the 12V+ coil pin of the first coil of the second contactor, forming the fourth branch; the third voltage pin is connected to contact A of the first single-pole double-throw switch, and contact S of the first single-pole double-throw switch is connected to the 12V+ coil pin of the second coil of the second single-pole double-throw switch and the 12V+ coil pin of the first coil of the first contactor, forming the fifth branch; the third, fourth, and fifth branches constitute a low-voltage connection circuit.

[0062] like Figure 4 As shown, both the first single-pole double-throw switch K1 and the second single-pole double-throw switch K2 include a second coil, a contact S, and a contact A, as follows. Figure 3 and Figure 4 As shown, both the first and second coils include a 12V+ pin and a 12V- pin. Figure 2 As shown, the contactor control module includes a contactor control 12V- pin (i.e., the first voltage pin), a charging mode 1 contactor control 12V+ pin (i.e., the second voltage pin), and a charging mode 2 contactor control 12V+ pin (i.e., the third voltage pin).

[0063] like Figure 2 As shown, the low-voltage control circuit connection method of this embodiment is as follows: the contactor control 12V- pin is connected to the coil 12V- pin of the second coil of the first single-pole double-throw switch K1, the coil 12V- pin of the second coil of the second single-pole double-throw switch K2, the coil 12V- terminal of the first coil of the first contactor KM1, and the coil 12V- pin of the first coil of the second contactor KM2, respectively; in charging mode 1, the contactor control 12V+ pin is connected to contact A of the second single-pole double-throw switch K2, and contact S of the second single-pole double-throw switch K2 is connected to the coil 12V+ pin of the second coil of the first single-pole double-throw switch K1 and the coil 12V+ pin of the first coil of the second contactor KM2, respectively; in charging mode 2, the contactor control 12V+ pin is connected to contact A of the first single-pole double-throw switch K1, and contact S of the first single-pole double-throw switch K1 is connected to the coil 12V+ pin of the second coil of the second single-pole double-throw switch K2 and the coil 12V+ pin of the first coil of the first contactor KM1, respectively.

[0064] In one alternative implementation, such as Figure 2 As shown, the shunt also includes a shunt communication module, and the battery management system also includes a current acquisition module and a charging communication module. The shunt communication module is connected to the current acquisition module, and the charging communication module is connected to the communication module of an external charger.

[0065] The specific working process of the charging mode interlock circuit of the battery system provided in this embodiment of the utility model is as follows:

[0066] The charging communication module in the battery management system (hereinafter referred to as BMS) interacts with the communication module of the external charger to confirm and determine whether to start charging. The current acquisition module in the battery management system communicates with the shunt communication module to detect the charging current.

[0067] like Figure 5 As shown, when the BMS receives a command from the charger's communication module to enter charging mode 1, the charging mode 1 contactor in the BMS controls the 12V+ pin to output 12V+ power. At this time, contacts S and A of the second single-pole double-throw switch K2 are connected, and the 12V+ power is supplied to the coil 12V+ of the first coil of the charging mode 1 contactor KM1 through the second single-pole double-throw switch K2, causing contacts S and A of the charging mode 1 contactor KM1 to be connected. The charging current of charging mode 1 is supplied to the battery pack. At the same time, the 12V+ power also flows through the second single-pole double-throw switch K2. The single-pole double-throw switch K2 supplies 12V+ to the coil of the first single-pole double-throw switch K1, causing the contacts of the first single-pole double-throw switch K1 to switch. Contacts S and A of the first single-pole double-throw switch K1 are disconnected, while contacts S and B are connected. At this time, even if the 12V+ pin of the charging mode 2 contactor control in the BMS is erroneously activated, the charging mode 2 contactor KM2 will never close because its coil circuit is always in the open state. The charging mode 2 interface cannot carry high voltage, thus completing the charging process of charging mode 1.

[0068] like Figure 6As shown, when the BMS receives a command from the charging pile's communication module to switch to charging mode 2, the charging mode 2 contactor in the BMS controls the 12V+ pin to output 12V+ electricity. At this time, contacts S and A of the first single-pole double-throw switch K1 are connected, and the 12V+ electricity is output through the first single-pole double-throw switch K1 to the coil 12V+ of the charging mode 2 contactor KM2. At this time, the charging mode 2 contactor KM2 closes, meaning contacts S and A of KM2 are connected, and the charging mode 2 current from KM2 is supplied to the battery pack. The output of the first single-pole double-throw switch K1 simultaneously supplies 12V+ to the coil of the second single-pole double-throw switch K2, causing the A contact B of the second single-pole double-throw switch K2 to switch. That is, contact S is disconnected from contact A and contact S is connected to contact B. At this time, even if the 12V+ pin of the charging mode 1 contactor in the BMS is erroneously activated, the charging mode 1 contactor KM1 will never close because the coil circuit of the charging mode 1 contactor KM1 is always in the open state. The charging mode 1 interface cannot carry high voltage, thus completing the charging process of charging mode 2.

[0069] The above together form the interlocked circuit connection for charging mode 1 and charging mode 2.

[0070] The charging mode interlock circuit for the battery system provided in this embodiment is applied inside the battery system of an electric vehicle. It is implemented through a circuit board and various electrical components. Compared to traditional physical protection methods, it employs hardware control, fundamentally solving the risk of a contactor malfunctioning and causing high voltage at other charging mode interfaces when one charging mode is in operation. This improves battery system safety and prevents electric shock. Compared to software protection methods, hardware control offers more reliable protection, eliminates the risks of electromagnetic interference and software defects, and eliminates the need for additional protective materials, thus saving costs.

[0071] This embodiment also provides a battery system for implementing the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the battery charging system described in the following embodiments is preferably implemented in hardware, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

[0072] This embodiment provides a battery system, such as Figure 7 As shown, including: Figure 1 , Figure 5 and Figure 6The diagram shows a charging mode interlock circuit for the battery system, and a battery pack. The positive terminal of the battery pack is connected to a contactor in the charging mode interlock circuit, and the negative terminal of the battery pack is connected to the contactor control module in the same circuit. The positive terminal of the battery pack is connected to the main fuse in the same circuit, and the negative terminal is connected to the shunt in the same circuit.

[0073] The further functional descriptions of the charging mode interlock circuits of the various battery systems described above are the same as those in the corresponding embodiments described above, and will not be repeated here.

[0074] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A charging mode interlock circuit for a battery system, characterized in that, The circuit includes: a battery management system, a contactor, and a switch control module; the battery management system includes a contactor control module. The contactors are respectively connected to different charging mode interfaces of the battery system and the switch control module, and the contactor control module is respectively connected to the contactors and the switch control module; When the battery system is charged in any specified charging mode, the contactor control module controls the contactor to control the circuit opening and closing in the specified charging mode through the specified charging mode interface, and controls the switch control module to interlock and switch other charging modes besides the specified charging mode.

2. The circuit according to claim 1, characterized in that, The contactor includes a first contactor and a second contactor, and the different charging mode interfaces of the battery system include a first charging mode interface and a second charging mode interface. The first contactor controls the on / off state of the first charging mode through the first charging mode interface; The second contactor controls the on / off state of the second charging mode through the second charging mode interface.

3. The circuit according to claim 2, characterized in that, Both the first contactor and the second contactor include a first coil. The switch control module includes a first single-pole double-throw switch and a second single-pole double-throw switch. The first single-pole double-throw switch is connected to the coil of the first contactor, and the second single-pole double-throw switch is connected to the coil of the second contactor.

4. The circuit according to claim 3, characterized in that, The first contactor and the second contactor also include contact S and contact A, and the circuit also includes a main fuse; The main fuse is connected to the contact S of the first contactor, and the A contact of the first contactor is connected to the positive terminal of the first charging mode interface to form the first branch. The main fuse is also connected to the contact S of the second contactor, and the A contact of the second contactor is connected to the positive terminal of the second charging mode interface to form a second branch. The first branch and the second circuit constitute a high-voltage connection circuit.

5. The circuit according to claim 4, characterized in that, Both the first single-pole double-throw switch and the second single-pole double-throw switch include a second coil, a contact S, and a contact A; the contactor control module includes a first voltage pin, a second voltage pin, and a third voltage pin; both the first coil and the second coil include a 12V+ pin and a 12V- pin; The first voltage pin is connected to the 12 V- pin of the second coil of the first single-pole double-throw switch, the 12 V- pin of the second coil of the second single-pole double-throw switch, the 12 V- pin of the first coil of the first contactor, and the 12 V- pin of the first coil of the second contactor to form the third branch; The second voltage pin is connected to contact A of the second single-pole double-throw switch. Contact S of the second single-pole double-throw switch is connected to the 12V+ pin of the second coil of the first single-pole double-throw switch and the 12V+ pin of the first coil of the second contactor to form the fourth branch. The third voltage pin is connected to the contact A of the first single-pole double-throw switch. The contact S of the first single-pole double-throw switch is connected to the 12V+ pin of the second coil of the second single-pole double-throw switch and the 12V+ pin of the first coil of the first contactor to form the fifth branch. The third, fourth, and fifth branches constitute a low-voltage connection circuit.

6. The circuit according to claim 1 or 3, characterized in that, The switch control module is replaced by a combination of MOS switches.

7. The circuit according to claim 2, characterized in that, The circuit also includes a shunt, which is connected to the negative terminal of the first charging mode interface and the negative terminal of the second charging mode interface, respectively.

8. The circuit according to claim 7, characterized in that, The shunt also includes a shunt communication module, and the battery management system also includes a current acquisition module and a charging communication module. The shunt communication module is connected to the current acquisition module, and the charging communication module is connected to the communication module of an external charger.

9. A battery system, characterized in that, The battery system includes a charging mode interlock circuit as described in any one of claims 1 to 8, and a battery pack, wherein the positive terminal of the battery pack is connected to a contactor in the charging mode interlock circuit of the battery system, and the negative terminal of the battery pack is connected to a contactor control module in the charging mode interlock circuit of the battery system.

10. The system according to claim 9, characterized in that, The positive terminal of the battery pack is connected to the main fuse in the charging mode interlock circuit of the battery system; the negative terminal of the battery pack is connected to the shunt in the charging mode interlock circuit of the battery system.

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