Circuit for carrying out safety detection on battery charging and discharging process and battery system

Abstract

The utility model relates to the technical field of batteries, and discloses a circuit for carrying out safety detection on a battery charging and discharging process and a battery system, and corresponding charging and discharging control operation is carried out on electronic equipment connected with a charging interface and a discharging interface through a charging and discharging control circuit; and the HMU high-voltage module detects a plurality of safety functions of the system where the battery is located according to the received related data of the charging and discharging process sent by the charging and discharging control circuit. Visibly, according to the application, by arranging the charging and discharging control circuit and the HMU high-voltage module, the accurate detection of the safety function in the battery charging and discharging process can be realized, and the early warning accuracy and timeliness of the safety fault of the battery system can be improved, so that the stable work of the battery system can be ensured; and the risk of equipment and equipment users for charging and discharging of the battery system can be reduced, and the conditions that the performance of the battery system is reduced and the service life of the battery system is shortened can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a circuit for detecting the safety of battery charging and discharging process and a battery system. BACKGROUND

[0002] In the existing high-voltage architecture, the BMS system (Battery Management System) lacks safety function detection, and when a safety failure occurs in the charging and discharging process (such as overcharging, overdischarging, short circuit, etc.), it cannot timely give a warning and alarm, and it is difficult to ensure the long-term stable operation of the BMS, which is easy to endanger the equipment (such as electric vehicles) and users of the equipment facing the BMS charging and discharging; and when a safety failure such as inaccurate data acquisition and out-of-control battery balancing occurs, it is easy to cause the performance of the PACK battery system to decline and the service life to be shortened. Therefore, it is particularly important to propose a technical solution for accurately detecting the safety function of the battery charging and discharging process. CONTENT OF THE INVENTION

[0003] The present application provides a circuit for detecting the safety of battery charging and discharging process and a battery system, which can accurately detect the safety function of the battery charging and discharging process, and is beneficial to improve the warning accuracy and timeliness of the safety failure of the battery system.

[0004] In order to solve the above technical problems, the first aspect of the present application discloses a circuit for detecting the safety of battery charging and discharging process, which comprises a charging and discharging control circuit, an HMU high-voltage module and a charging and discharging interface, wherein:

[0005] The first output end of the charging and discharging control circuit is electrically connected to the positive electrode of the charging and discharging interface, the input end of the charging and discharging control circuit is electrically connected to the negative electrode of the charging and discharging interface, the second output end of the charging and discharging control circuit is electrically connected to the input end of the HMU high-voltage module, the signal input end of the charging and discharging control circuit is used for electrically connecting the signal output end of the battery module, the power supply end of the charging and discharging control circuit is used for electrically connecting the positive electrode of the battery module, the power supply end of the HMU high-voltage module is used for electrically connecting the negative electrode of the battery module, and all the signal transmission ends of the charging and discharging control circuit are electrically connected to the corresponding signal transmission ends of the HMU high-voltage module;

[0006] The charging and discharging control circuit is used for performing corresponding charging and discharging control operations on the electronic equipment connected to the charging interface and the discharging interface, and the charging and discharging control operations include charging control operations or discharging control operations;

[0007] The HMU high-voltage module is used for performing a plurality of safety function detections on the system where the battery is located according to the related data of the charging and discharging process sent by the charging and discharging control circuit.

[0008] As an optional implementation, in the first aspect of the application, the charging and discharging interface comprises a charging interface and a discharging interface, and the charging operation and the discharging operation are independently controlled by setting the charging interface and the discharging interface.

[0009] As an optional implementation, in the first aspect of the application, the charging and discharging control circuit comprises a control module and a charging and discharging module, and each signal transmission end comprises a signal input end or a signal output end, wherein:

[0010] The signal input end of the control module is electrically connected to the signal output end of the HMU high-voltage module, and is used for electrically connecting the signal output end of the battery module, the control end of the control module is respectively electrically connected to the positive electrode of the charging interface, the negative electrode of the charging interface, the positive electrode of the discharging interface and the negative electrode of the charging and discharging interface, the first voltage output end of the charging and discharging module is electrically connected to the positive electrode of the charging interface and the positive electrode of the discharging interface, the voltage input end of the charging and discharging module is electrically connected to the negative electrode of the charging interface and the negative electrode of the discharging interface, the second voltage output end of the charging and discharging module is electrically connected to the voltage input end of the HMU high-voltage module, the signal output end of the charging and discharging module is electrically connected to the signal input end of the HMU high-voltage module, and the power supply end of the charging and discharging module is used for electrically connecting the positive electrode of the battery module.

[0011] The control module is used for controlling the state of each component contained in the charging and discharging module, so as to realize the charging and discharging control of the battery module.

[0012] As an optional implementation, in the first aspect of the application, the charging and discharging module comprises a fuse, a main positive relay and a main negative relay, wherein:

[0013] The output end of the fuse is electrically connected to the input end of the main positive relay, the input end of the fuse is electrically connected to the first signal input end of the HMU high-voltage module, and is used for electrically connecting the positive electrode of the battery module, the output end of the main positive relay is electrically connected to the positive electrode of the charging interface, the negative electrode of the discharging interface and the second signal input end of the HMU high-voltage module, the input end of the main negative relay is electrically connected to the negative electrode of the charging interface, the negative electrode of the discharging interface and the third signal input end of the HMU high-voltage module, and the output end of the main negative relay is electrically connected to the input end of the HMU high-voltage module.

[0014] As an optional implementation, in the first aspect of the application, a charging loop of a battery system to which the circuit belongs is formed by the positive electrode of the battery module, the fuse, the main positive relay, the positive electrode of the charging interface, the negative electrode of the charging interface, the HMU high-voltage module, the main negative relay, and the negative electrode of the battery module.

[0015] A discharging loop of the battery system is formed by the positive electrode of the battery module, the fuse, the main positive relay, the positive electrode of the discharging interface, the negative electrode of the discharging interface, the HMU high-voltage module, the main negative relay, and the negative electrode of the battery module.

[0016] As an optional implementation, in the first aspect of the application, the charging and discharging module further comprises a fast charging relay, an input end of the fast charging relay is electrically connected to an output end of the main positive relay, and an output end of the fast charging relay is electrically connected to the positive electrode of the charging interface and a fourth signal input end of the HMU high-voltage module.

[0017] As an optional implementation, in the first aspect of the application, the charging and discharging control circuit further comprises a pre-charging module, and the pre-charging module comprises a pre-charging relay and a pre-charging resistor, wherein a first end of the pre-charging relay is electrically connected to an input end of the main positive relay, a second end of the pre-charging relay is electrically connected to one end of the pre-charging resistor, and the other end of the pre-charging resistor is electrically connected to an output end of the main positive relay.

[0018] The pre-charging module is configured to control a current pulse in a power-on / off process of an electronic device connected to the charging and discharging interface.

[0019] As an optional implementation, in the first aspect of the application, the control module comprises a master control unit and a slave control unit, wherein:

[0020] A signal input end of the master control unit is electrically connected to a signal output end of the HMU high-voltage module, a communication end of the master control unit is electrically connected to a communication end of the slave control unit, control ends of the master control unit are respectively electrically connected to the positive electrode of the charging and discharging interface and the negative electrode of the charging and discharging interface, and a signal input end of the slave control unit is configured to be electrically connected to a signal output end of the battery module.

[0021] As an optional implementation, in the first aspect of the application, the number of the slave control units is greater than or equal to 1, and the signal input end of each slave control unit is configured to be electrically connected to the signal output end of a corresponding battery cell included in the battery module.

[0022] As an optional implementation, in the first aspect of the present application, the circuit further comprises the battery module, the HMU high-voltage module is provided with a fifth signal input end for electrically connecting the negative electrode of the battery module, and the battery module comprises at least one battery cell, and the number of the battery cells corresponds to the number of the slave control units.

[0023] The second aspect of the present application discloses a battery system comprising the circuit for detecting the safety of the charging and discharging process of the battery as disclosed in any one of the first aspect of the present application.

[0024] The present application has the following beneficial effects:

[0025] The charging and discharging control circuit performs corresponding charging and discharging control operations on the electronic device connected to the charging interface and the discharging interface, and the charging and discharging control operations include charging control operations or discharging control operations; and the HMU high-voltage module performs multiple safety function detections on the system where the battery is located according to the related data of the charging and discharging process sent by the charging and discharging control circuit. It can be seen that the present application can realize accurate detection of the safety function of the battery charging and discharging process by setting the charging and discharging control circuit and the HMU high-voltage module, which is conducive to improving the early warning accuracy and timeliness of the safety failure of the battery system, thereby protecting the stable operation of the battery system, and reducing the risk of the equipment and equipment users facing the battery system charging and discharging, and reducing the performance degradation and life shortening of the battery system. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Figure 1 is a structural schematic diagram of a circuit for detecting the safety of the battery charging and discharging process disclosed by the embodiments of the present application;

[0028] Figure 2 is a structural schematic diagram of another circuit for detecting the safety of the battery charging and discharging process disclosed by the embodiments of the present application;

[0029] Figure 3 is a structural schematic diagram of another circuit for detecting the safety of the battery charging and discharging process disclosed by the embodiments of the present application;

[0030] Figure 4 is a structural schematic diagram of a battery system disclosed by the embodiments of the present application. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0032] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, apparatus, product, or end that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or ends.

[0033] 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.

[0034] This application discloses a circuit and battery system for safety detection during battery charging and discharging. The charging and discharging control circuit executes corresponding charging and discharging control operations on the electronic devices connected to the charging and discharging interfaces. Furthermore, the HMU high-voltage module performs multiple safety function checks on the battery system based on the relevant data received from the charging and discharging control circuit. By setting up the charging and discharging control circuit and the HMU high-voltage module, accurate detection of safety functions during battery charging and discharging can be achieved. This improves the accuracy and timeliness of early warnings for safety faults in the battery system, thereby ensuring stable operation of the battery system. It also helps reduce the risks to the equipment and users involved in charging and discharging the battery system, and reduces the occurrence of battery system performance degradation and shortened lifespan. Detailed descriptions follow.

[0035] Example 1

[0036] Please see Figure 1 , Figure 1is a flowchart of a circuit for safety detection of battery charging and discharging process disclosed by the embodiment of the present application. Wherein, Figure 1 The circuit for safety detection of battery charging and discharging process described can be used in electronic products (such as electric vehicles) that need to detect the safety of battery charging and discharging process, and the embodiment of the present application is not limited. For example, Figure 1 As shown in the figure, the circuit for safety detection of battery charging and discharging process can include a charging and discharging control circuit 101, an HMU high-voltage module 102, and a charging and discharging interface 103, wherein:

[0037] The first output end of the charging and discharging control circuit 101 is electrically connected to the positive electrode of the charging and discharging interface 103, the input end of the charging and discharging control circuit 101 is electrically connected to the negative electrode of the charging and discharging interface 103, the second output end of the charging and discharging control circuit 101 is electrically connected to the input end of the HMU high-voltage module 102, the signal input end of the charging and discharging control circuit 101 is used for electrically connecting the signal output end of the battery module 104, the power supply end of the charging and discharging control circuit 101 is used for electrically connecting the positive electrode of the battery module 104, the power supply end of the HMU high-voltage module 102 is used for electrically connecting the negative electrode of the battery module 104, and all signal transmission ends of the charging and discharging control circuit 101 are electrically connected to the corresponding signal transmission ends of the HMU high-voltage module 102;

[0038] The charging and discharging control circuit 101 is used for performing corresponding charging and discharging control operations on the electronic equipment connected to the charging interface 1031 and the discharging interface 1032, and the charging and discharging control operations include charging control operations or discharging control operations.

[0039] The HMU high-voltage module 102 is used for performing a plurality of safety function detections on the system where the battery is located according to the related data of the charging and discharging process sent by the charging and discharging control circuit 101.

[0040] In the embodiment of the present application, the HMU high-voltage module 102 is a key component used in electric vehicles or battery management systems (BMS), mainly used for providing multi-channel total voltage detection and CAN communication functions, and the HMU high-voltage module 102 can also be used for detecting the state of the relay, detecting one or more safety functions of the battery system where the battery is located, such as overcharging, overdischarging, overheating, liquid leakage, gas leakage, and short circuit, to ensure the normal operation and safety of the battery system. Specifically, the way in which the HMU high-voltage module 102 performs a plurality of safety function detections on the system where the battery is located according to the related data of the charging and discharging process sent by the charging and discharging control circuit 101 specifically includes:

[0041] The HMU high-voltage module 102 receives the current data of the charging and discharging process of the charging and discharging control circuit 101 and sends the current data to the charging and discharging control circuit 101;

[0042] The charge-discharge control circuit 101 controls the state of the charge-discharge operation according to the current data, the voltage data and the battery temperature data sent by the battery module 104. Specifically, when it is detected that there is a safety problem in the circuit according to the current data, the voltage data and the battery temperature data, the charge-discharge control circuit 101 controls the charge-discharge operation to stop execution, and further, an alarm prompt can be made through the sound-light device (such as an LED lamp) connected to the charge-discharge control circuit 101; when it is detected that there is no safety problem in the circuit, the charge-discharge control circuit 101 controls the charge-discharge operation to continue execution.

[0043] It can be seen that the implementation Figure 1 The circuit described for detecting the safety of the battery charge-discharge process performs corresponding charge-discharge control operation on the electronic device connected to the charge interface 1031 and the discharge interface 1032 through the charge-discharge control circuit 101; and performs multiple safety function detection on the system where the battery is located according to the relevant data of the charge-discharge process sent by the charge-discharge control circuit 101 received by the HMU high-voltage module 102. The present application can realize accurate detection of the safety function of the battery charge-discharge process by setting the charge-discharge control circuit 101 and the HMU high-voltage module 102, which is conducive to improving the early warning accuracy and timeliness of the safety failure of the battery system, thereby being conducive to ensuring the stable operation of the battery system, and being conducive to reducing the risk of the equipment and the equipment user facing the battery system charge-discharge, and reducing the performance degradation and life shortening of the battery system.

[0044] In this alternative embodiment, as Figure 2 shown, Figure 2 is another structure diagram of a circuit for detecting the safety of the battery charge-discharge process disclosed in the embodiments of the present application, wherein the charge-discharge interface 103 includes a charge interface 1031 and a discharge interface 1032, which are used to realize independent control of the charge operation and the discharge operation by setting the charge interface 1031 and the discharge interface 1032. The charge interface 1031 and the discharge interface 1032 can be interfaces of the same type but different key positions. In this way, by setting separate charge interface 1031 and discharge interface 1032, it is possible to avoid the mutual interference during the charge-discharge operation, and at the same time, it is convenient for subsequent maintenance and other operations.

[0045] In this alternative embodiment, as Figure 3 shown, Figure 3 is another structure diagram of a circuit for detecting the safety of the battery charge-discharge process disclosed in the embodiments of the present application, wherein the charge-discharge control circuit 101 can include a control module 1011 and a charge-discharge module 1012, and each signal transmission end includes a signal input end or a signal output end, wherein:

[0046] The signal input end of the control module 1011 is electrically connected with the signal output end of the HMU high-voltage module 102 (such as EBP800P_HMU shown in the figure), and is used for electrically connecting the signal output end of the battery module 104. Figure 3 The control end of the control module 1011 is electrically connected with the positive pole (such as fast charge+ shown in the figure) of the charging interface 1031, the negative pole (such as fast charge- shown in the figure) of the charging interface 1031, the positive pole (such as discharge+ shown in the figure) of the discharging interface 1032 and the negative pole (such as discharge- shown in the figure) of the charging and discharging interface 103 respectively. Figure 3 Figure 3 Figure 3 Figure 3 The first voltage output end of the charging and discharging module 1012 is electrically connected with the positive pole of the charging interface 1031 and the positive pole of the discharging interface 1032, the voltage input end of the charging and discharging module 1012 is electrically connected with the negative pole of the charging interface 1031 and the negative pole of the discharging interface 1032, the second voltage output end of the charging and discharging module 1012 is electrically connected with the voltage input end of the HMU high-voltage module 102, the signal output end of the charging and discharging module 1012 is electrically connected with the signal input end of the HMU high-voltage module 102, and the power supply end of the charging and discharging module 1012 is used for electrically connecting the positive pole of the battery module 104.

[0047] The control module 1011 is used for controlling the state of each component contained in the charging and discharging module 1012, so as to realize the charging and discharging control of the battery module 104.

[0048] In the embodiment, the HMU high-voltage module 102 is provided with a current collection sensor, which is used for collecting the current data output by the corresponding component through the signal transmission end of the component electrically connected with the signal transmission end of the HMU high-voltage module 102. Specifically, the control module 1011 controls the state (such as the on state or the off state) of each component contained in the charging and discharging module 1012 according to the received current data sent by the HMU high-voltage module 102 and the received battery data (such as voltage data, temperature data, etc.) sent by the battery module 104, so as to realize one or more of the charging start control, the discharging start control and the charging and discharging switching control (such as switching from the charging mode to the discharging mode or switching from the discharging mode to the charging mode), etc., which are not limited in the embodiment.

[0049] ​​​It can be seen that the optional embodiment can set the control module 1011 and the charging and discharging module 1012, and control the state of each component included in the charging and discharging module 1012 through the control module 1011 to realize the charging and discharging control of the battery module 104. The precise control of the charging and discharging operation of the battery system where the battery module 104 is located can be realized through the control of the control module 1011 on the charging and discharging module 1012, which is conducive to improving the control accuracy and reliability of the charging and discharging operation of the battery system, thereby reducing the safety accidents caused by abnormal charging and discharging operation in the charging and discharging process based on the precise control of the charging and discharging operation, and further protecting the safe use of the battery system.

[0050] In this optional embodiment, as shown in Figure 3 The charging and discharging module 1012 includes a fuse F, a main positive relay K1, and a main negative relay K2.

[0051] The output end of the fuse F is electrically connected to the input end of the main positive relay K1. The input end (e.g., BAT+ shown in Figure 3 The output end of the main positive relay K1 (e.g., POS+ shown in Figure 3 The input end of the main negative relay K2 (e.g., NEG- shown in Figure 3 The output end of the main negative relay K2 is electrically connected to the input end of the HMU high-voltage module 102.

[0052] In this optional embodiment, the charging circuit of the battery system to which the circuit belongs is composed of the positive electrode of the battery module 104, the fuse F, the main positive relay K1, the positive electrode of the charging interface 1031, the negative electrode of the charging interface 1031, the HMU high-voltage module 102, the main negative relay K2, and the negative electrode of the battery module 104. The discharging circuit of the battery system is composed of the positive electrode of the battery module 104, the fuse F, the main positive relay K1, the positive electrode of the discharging interface 1032, the negative electrode of the discharging interface 1032, the HMU high-voltage module 102, the main negative relay K2, and the negative electrode of the battery module 104. The main positive relay K1 is a charging positive relay, and the main negative relay K2 is a charging negative relay.

[0053] It can be seen that the optional embodiment can set the charging module and the discharging module in series, that is, the charging function and the discharging function can be realized by two relays of the main positive relay K1 and the main negative relay K2. Compared with the parallel connection of the charging module and the discharging module (that is, the charging function and the discharging function are realized by three relays of the main positive relay K1, the main negative relay K2 and the charging relay) in the prior art, the scheme can realize the centralized control of the charging / discharging circuit by the control module 1011, and the series connection of the charging / discharging circuit can divide the voltage of the whole circuit, thereby playing a role in protecting the circuit, and reducing the relays required to realize the charging / discharging function is conducive to reducing the production cost of the circuit.

[0054] In the optional embodiment, as shown in Figure 3 The charging / discharging module 1012 further includes a fast charging relay K3. The input end of the fast charging relay K3 is electrically connected to the output end of the main positive relay K1. The output end (DCHG+ as shown in Figure 3 The output end of the fast charging relay K3 is electrically connected to the positive electrode of the charging interface 1031 and the fourth signal input end of the HMU high-voltage module 102. In this way, by setting the fast charging relay K3, the fast charging function of the charging circuit is realized, which is conducive to improving the charging efficiency and charging speed of the circuit.

[0055] In the optional embodiment, as shown in Figure 3 The charging / discharging control circuit 101 can further include a pre-charging module 1013, and the pre-charging module 1013 can include a pre-charging relay K4 and a pre-charging resistor R1. The first end of the pre-charging relay K4 is electrically connected to the input end of the main positive relay K1. The second end of the pre-charging relay K4 is electrically connected to one end of the pre-charging resistor R1. The other end of the pre-charging resistor R1 is electrically connected to the output end of the main positive relay K1. The pre-charging module 1013 is used to control the current pulse in the power-on and power-off process of the electronic device connected to the charging / discharging interface 103. As shown in Figure 3 The components in the charging / discharging module 1012, the components in the pre-charging module 1013 and the HMU high-voltage module 102 can be integrated in the same board of the battery system. In this way, by setting the parallel connection of the pre-charging module 1013 at both ends of the main positive relay K1, the self-protection of the battery system to which the circuit belongs to the large current impact can be realized, and the irreversible consequences caused by the pulse current to the electrical components and the battery can be effectively prevented.

[0056] In the optional embodiment, as shown in Figure 3 The control module 1011 includes a master control unit and a slave control unit, wherein:

[0057] The signal input end of the main control unit is electrically connected with the signal output end of the HMU high-voltage module 102, the communication end of the main control unit is electrically connected with the communication end of the slave control unit, and the control end (such as the high-voltage interlock input and high-voltage interlock output ports shown in Figure 3 FIG. 8) of the main control unit is respectively electrically connected with the positive electrode of the charge-discharge interface 103 and the negative electrode of the charge-discharge interface 103, and the signal input end of the slave control unit is electrically connected with the signal output end of the battery module 104. The main control unit includes a main control board (such as the EBP800P chip shown in Figure 3 FIG. 8) of the BMS (i.e., the battery management system), and the slave control unit includes a slave control board of the BMS. The slave control unit can collect voltage data and / or temperature data of the battery module 104 and send the collected voltage data and / or temperature data to the main control unit. Through processing of the received data by the main control unit, the charge-discharge control of the circuit is realized. Optionally, the control module 1011 can further include a communication unit (such as the T-BOX shown in Figure 3 FIG. 8), and the communication end of the communication unit is electrically connected with the communication end of the main control unit. In this way, by arranging multiple control boards in the battery system, precise control of the charge-discharge function of the battery system can be realized through data interaction between the multiple control boards.

[0058] In this optional embodiment, as shown in Figure 3 the number of slave control units is greater than or equal to 1, and the signal input end of each slave control unit is electrically connected with the signal output end of the corresponding battery cell included in the battery module 104. Each battery cell includes at least one battery, Figure 3 The circuit described above is taken as an example of 2 battery cells and 2 slave control units, and each battery cell includes 4 batteries, as shown in Figure 3 The first battery cell includes a first battery M1, a second battery M2, a third battery M3, and a fourth battery M4, and the first battery cell communicates with a first slave control unit (such as the CSC1 shown in Figure 3 FIG. 8) to enable the first slave control unit to collect voltage / temperature data of the first battery cell; the second battery cell includes a fifth battery M5, a sixth battery M6, a seventh battery M7, and an eighth battery M8, and the second battery cell communicates with a second slave control unit (such as the CSC2 shown in Figure 3 FIG. 8) to enable the second slave control unit to collect voltage / temperature data of the second battery cell.

[0059] In the embodiments of the present application, the distances between each slave control unit and the master control unit are sorted. Specifically, when the number of slave control units is greater than or equal to 2, the slave control units include a basic slave control unit and at least one target slave control unit, and the distance between the basic slave control unit and the master control unit is the shortest (i.e., the basic slave control unit is sorted first), and the communication output end of the basic slave control unit is electrically connected to the communication end of the master control unit; wherein,

[0060] The communication input end of the basic slave control unit is electrically connected to the communication output end of the target slave control unit sorted next.

[0061] The signal input end of each slave control unit is used to electrically connect the signal output end of the corresponding battery unit.

[0062] It can be seen that the optional embodiments can accurately transmit the data of the battery units connected to the slave control units to the master control unit by setting multiple slave control units and by each slave control unit communicating in the corresponding order.

[0063] In the optional embodiments, as shown in Figure 4 The circuit further includes a battery module 104, and the HMU high-voltage module 102 is provided with a fifth signal input end for electrically connecting the negative electrode (e.g., BAT- shown in Figure 4 ) of the battery module 104, and the battery module 104 includes at least one battery unit, and the number of battery units corresponds to the number of slave control units. In this way, by setting a corresponding slave control unit for each battery unit, the data transmission speed and efficiency of each slave control unit can be improved, thereby facilitating the control speed and efficiency of the charging and discharging operation of the battery system based on the fast transmission of data.

[0064] The working principle of the circuit for safety detection of the battery charging and discharging process in the embodiments of the present application is as follows:

[0065] When the electronic device (such as an electric vehicle) connected to the charging and discharging interface 103 is in a charging state, the current flows from the positive electrode of the battery module 104, sequentially passes through the fuse F, the main positive relay K1, the positive electrode of the charging interface 1031, the negative electrode of the charging interface 1031, the HMU high-voltage module 102, the main negative relay K2, and the negative electrode of the battery module 104, to form a charging circuit, thereby realizing charging control of the electronic device. At this time, the current data of each component in the circuit is collected by the HMU high-voltage module 102 arranged in the circuit, and the current data is sent to the main control unit. The main control unit detects whether there are overcharging, overheating, and short circuit safety problems during the charging process. If there are, the main control unit controls the charging operation to stop execution. When the electronic device is in a discharging state, the current flows from the positive electrode of the battery module 104, sequentially passes through the fuse F, the main positive relay K1, the positive electrode of the discharging interface 1032, the negative electrode of the discharging interface 1032, the HMU high-voltage module 102, the main negative relay K2, and the negative electrode of the battery module 104, to form a discharging circuit, thereby realizing discharging control of the electronic device. Similarly, at this time, the current data of each component in the circuit is collected by the HMU high-voltage module 102 arranged in the circuit, and the current data is sent to the main control unit. The main control unit detects whether there are over-discharging, overheating, and short circuit safety problems during the discharging process. If there are, the main control unit controls the discharging operation to stop execution. It can be seen that the present scheme performs corresponding charging and discharging control operations on the electronic device connected to the charging interface 1031 and the discharging interface 1032 through the charging and discharging control circuit 101. Moreover, the HMU high-voltage module 102 performs a plurality of safety function detections on the battery system according to the related data of the charging and discharging process sent by the charging and discharging control circuit 101. The present scheme can realize accurate detection of the safety function of the battery charging and discharging process by arranging the charging and discharging control circuit 101 and the HMU high-voltage module 102, which is conducive to improving the early warning accuracy and timeliness of safety faults of the battery system, thereby being conducive to ensuring the stable operation of the battery system, and being conducive to reducing the risk of the equipment and the user of the equipment facing the battery system charging and discharging, and reducing the performance degradation and service life shortening of the battery system.

[0066] Embodiment Two

[0067] Please refer to Figure 4 , Figure 4 is a structural schematic diagram of a battery system disclosed by the embodiments of the present application. Wherein, ​ The circuit for safety detection of the battery charging and discharging process described herein includes the circuit for safety detection of the battery charging and discharging process as described in Embodiment One. It should be noted that for detailed description of the circuit for safety detection of the battery charging and discharging process, please refer to the specific description of the related content in Embodiment One, which will not be repeated here.

[0068] It can be seen that the implementation ​ The described battery system can perform corresponding charging and discharging control operation on the electronic device connected to the charging interface 1031 and the discharging interface 1032 through the charging and discharging control circuit 101; and through the HMU high-voltage module 102, the relevant data of the charging and discharging process sent by the charging and discharging control circuit 101 is received, and the system where the battery is located is detected for multiple safety functions. The present application can realize accurate detection of the safety function of the battery charging and discharging process by setting the charging and discharging control circuit 101 and the HMU high-voltage module 102, which is conducive to improving the early warning accuracy and timeliness of the safety failure of the battery system, thereby being conducive to ensuring the stable operation of the battery system, and being conducive to reducing the risk of the equipment and equipment users facing the battery system charging and discharging, and reducing the performance degradation and service life shortening of the battery system.

[0069] The above describes in detail the vehicle battery management system and electric vehicle disclosed by the embodiments of the present application. The principles and implementation methods of the present application are described by applying specific embodiments. However, the above preferred embodiments are not intended to limit the present application. The above embodiment description is only used to help understand the method and its core idea of the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, without departing from the spirit and scope of the present application, the specific implementation method and application range can be changed. Therefore, the protection scope of the present application is subject to the scope defined by the claims.

Claims

1. A circuit for safety detection of a battery charging and discharging process, characterized in that, The circuit comprises a charge-discharge control circuit (101), an HMU high-voltage module (102), and a charge-discharge interface (103), wherein: The first output end of the charge-discharge control circuit (101) is electrically connected to the positive pole of the charge-discharge interface (103), the input end of the charge-discharge control circuit (101) is electrically connected to the negative pole of the charge-discharge interface (103), the second output end of the charge-discharge control circuit (101) is electrically connected to the input end of the HMU high-voltage module (102), the signal input end of the charge-discharge control circuit (101) is used for electrically connecting the signal output end of a battery module (104), the power supply end of the charge-discharge control circuit (101) is used for electrically connecting the positive pole of the battery module (104), the power supply end of the HMU high-voltage module (102) is used for electrically connecting the negative pole of the battery module (104), and all the signal transmission ends of the charge-discharge control circuit (101) are electrically connected to the corresponding signal transmission ends of the HMU high-voltage module (102); The charge-discharge control circuit (101) is used for performing corresponding charge-discharge control operations on electronic devices connected to the charge interface (1031) and the discharge interface (1032), and the charge-discharge control operations comprise charge control operations or discharge control operations. The HMU high-voltage module (102) is used for performing multiple safety function detections on a system in which the battery is located according to the relevant data of the charge-discharge process sent by the charge-discharge control circuit (101).

2. The circuit for safety detection of battery charging and discharging process according to claim 1, wherein, The charge-discharge interface (103) comprises a charge interface (1031) and a discharge interface (1032), and is used for realizing independent control of charge operations and discharge operations by setting the charge interface (1031) and the discharge interface (1032).

3. The circuit for safe detection of battery charging and discharging process as claimed in claim 2 wherein, The charge-discharge control circuit (101) comprises a control module (1011) and a charge-discharge module (1012), and each signal transmission end comprises a signal input end or a signal output end. The signal input end of the control module (1011) is electrically connected with the signal output end of the HMU high-voltage module (102), and is used for electrically connecting the signal output end of the battery module (104); the control end of the control module (1011) is respectively electrically connected with the positive pole of the charging interface (1031), the negative pole of the charging interface (1031), the positive pole of the discharging interface (1032) and the negative pole of the charging and discharging interface (103); the first voltage output end of the charging and discharging module (1012) is electrically connected with the positive pole of the charging interface (1031) and the positive pole of the discharging interface (1032); the voltage input end of the charging and discharging module (1012) is electrically connected with the negative pole of the charging interface (1031) and the negative pole of the discharging interface (1032); the second voltage output end of the charging and discharging module (1012) is electrically connected with the voltage input end of the HMU high-voltage module (102); the signal output end of the charging and discharging module (1012) is electrically connected with the signal input end of the HMU high-voltage module (102); and the power supply end of the charging and discharging module (1012) is used for electrically connecting the positive pole of the battery module (104). The control module (1011) is used for controlling the state of each component contained in the charging and discharging module (1012), so as to realize the charging and discharging control of the battery module (104).

4. The circuit for safe detection of battery charging and discharging process as claimed in claim 3 wherein, The charging and discharging module (1012) comprises a fuse, a main positive relay and a main negative relay. The output end of the fuse is electrically connected with the input end of the main positive relay; the input end of the fuse is electrically connected with the first signal input end of the HMU high-voltage module (102) and is used for electrically connecting the positive pole of the battery module (104); the output end of the main positive relay is electrically connected with the positive pole of the charging interface (1031), the negative pole of the discharging interface (1032) and the second signal input end of the HMU high-voltage module (102); the input end of the main negative relay is electrically connected with the negative pole of the charging interface (1031), the negative pole of the discharging interface (1032) and the third signal input end of the HMU high-voltage module (102); and the output end of the main negative relay is electrically connected with the input end of the HMU high-voltage module (102).

5. The circuit for safe detection of battery charging and discharging process as claimed in claim 4 wherein, A charging loop of a battery system to which the circuit belongs is formed by the positive pole of the battery module (104), the fuse, the main positive relay, the positive pole of the charging interface (1031), the negative pole of the charging interface (1031), the HMU high-voltage module (102), the main negative relay and the negative pole of the battery module (104); A discharging loop of the battery system is formed by the positive pole of the battery module (104), the fuse, the main positive relay, the positive pole of the discharging interface (1032), the negative pole of the discharging interface (1032), the HMU high-voltage module (102), the main negative relay and the negative pole of the battery module (104).

6. The circuit for safe detection of battery charging and discharging process as claimed in claim 5 wherein, The charging and discharging module (1012) further comprises a fast charging relay, an input end of the fast charging relay is electrically connected with an output end of the main positive relay, and an output end of the fast charging relay is electrically connected with a positive electrode of the charging interface (1031) and a fourth signal input end of the HMU high-voltage module (102).

7. The circuit for safe detection of battery charging and discharging process as claimed in claim 6 wherein, The charging and discharging control circuit (101) further comprises a pre-charging module (1013), and the pre-charging module (1013) comprises a pre-charging relay and a pre-charging resistor, wherein a first end of the pre-charging relay is electrically connected with an input end of the main positive relay, a second end of the pre-charging relay is electrically connected with one end of the pre-charging resistor, and the other end of the pre-charging resistor is electrically connected with an output end of the main positive relay. The pre-charging module (1013) is configured to control a current pulse in a power-on / off process of an electronic device connected with the charging and discharging interface (103).

8. The circuit for safety detection of the charging and discharging process of the battery according to any one of claims 3-7, characterized in that, The control module (1011) comprises a master control unit and a slave control unit, wherein: a signal input end of the master control unit is electrically connected with a signal output end of the HMU high-voltage module (102), a communication end of the master control unit is electrically connected with a communication end of the slave control unit, a control end of the master control unit is respectively electrically connected with a positive electrode of the charging and discharging interface (103) and a negative electrode of the charging and discharging interface (103), and a signal input end of the slave control unit is configured to be electrically connected with a signal output end of the battery module (104).

9. The circuit for safe detection of battery charging and discharging process as claimed in claim 8 wherein, The number of the slave control units is greater than or equal to 1, and the signal input end of each slave control unit is configured to be electrically connected with a signal output end of a corresponding battery cell included in the battery module (104).

10. The circuit for safe detection of battery charging and discharging process according to claim 9, wherein, The circuit further comprises the battery module (104), the HMU high-voltage module (102) is provided with a fifth signal input end configured to be electrically connected with a negative electrode of the battery module (104), and the battery module (104) comprises at least one battery cell, and the number of the battery cells corresponds to the number of the slave control units.

11. A battery system characterized by, The battery system comprises the circuit for detecting safety of a battery charging and discharging process according to any one of claims 1-10.

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