Battery management system

Abstract

The invention relates to the technical field of energy storage systems, in particular to a battery management system. The positive input end is connected with the positive end of a battery pack in the battery cabinet; the power output end is connected with a positive bus of the external direct-current bus; an anode input copper bar is arranged in the shell, and the anode input end is connected with the anode input copper bar; a power output copper bar is arranged in the shell, and the power output end is connected with the power output copper bar; the first end of the relay is connected with the anode input copper bar, and the second end is connected with the power output copper bar; and the battery management unit is used for controlling the relay to be connected according to an externally input control instruction so as to charge the battery pack or output power. In order to solve the problems that in the prior art, the number of communication interfaces supported by a battery management system is small, and related communication requirements cannot be met, in the scheme, a 485 communication monitoring board is introduced, related interfaces are introduced through the 485 communication monitoring board and uniformly arranged on the back face of a shell, and related signal access requirements are met.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage systems, and in particular to a battery management system. Background Art

[0002] The backup energy storage system, also known as the uninterruptible power supply (UPS), is an uninterruptible power supply with an energy storage device. It is mainly used to provide uninterruptible power supply to some equipment that has high requirements for power stability. When the mains input is normal, the UPS stabilizes the mains and supplies it to the load. At this time, the UPS is an AC voltage stabilizer, and it also charges the battery inside the machine; when the mains power is interrupted (power outage), the UPS immediately switches the DC power of the battery to the load through the inverter switching method to continue to supply 220V AC power to the load, so that the load maintains normal operation and protects the load software and hardware from damage. UPS equipment can usually provide protection against overvoltage or undervoltage.

[0003] In the prior art, there are already many energy storage systems constructed based on lithium-ion battery packs and battery management systems.

[0004] For example, Chinese patent CN202210540002.4 discloses an uninterruptible BMS system for an energy storage system, including a balancing switch matrix, a high-voltage box, an external total voltage VB+ and an external total voltage VB-, wherein the high-voltage box is respectively provided with a switching power supply, a BMS battery system and a high-voltage contactor, and the positive and negative poles of the switching power supply are respectively electrically connected to the positive and negative poles of the balancing switch matrix and the positive and negative poles of the BMS battery system to form a power supply circuit, wherein a capacitor C is electrically connected in the power supply circuit, and the capacitor C is electrically connected to the positive and negative poles between the switching power supply and the balancing switch matrix, so as to maintain uninterrupted normal operation of the system without being affected by power supply abnormalities, and can normally and continuously monitor the operating status of the battery cells, estimate the SOC, and perform balancing management, etc., to ensure the integrity of the battery data record, which is beneficial to provide strong data support for the battery life budget.

[0005] For another example, Chinese patent CN202010898555.8 discloses a BMS control system for an energy storage system, including a system detection module, a system evaluation module, a system balancing module, a system analysis module, and a logic control module. The system detection module detects the energy storage system and control system in the BMS system, and sends the detection results to other modules in the system respectively. The system evaluation module evaluates the BMS system based on the detection results provided by the system detection module. The system balancing module selects a balancing method based on the detection results of the system detection module and the evaluation results of the system evaluation module, and performs charge and discharge balancing of the system. The system analysis module dynamically analyzes the control modules in the energy storage system and the control system to obtain the control strategy of the BMS system. The logic control module controls various types of equipment in the BMS system based on the control strategy obtained by the system analysis module. It has efficient and accurate effects, and can provide a good reference value for the application and promotion of the BMS system in new energy.

[0006] However, during the implementation process, the inventors found that the existing battery management system can support fewer communication modes and it is difficult to meet related communication needs. Summary of the invention

[0007] In view of the above problems existing in the prior art, a battery management system is now provided.

[0008] The specific technical solutions are as follows:

[0009] A battery management system includes a housing;

[0010] The back side of the shell is provided with a positive input terminal and a power output terminal;

[0011] The positive input terminal is connected to the positive terminal of the battery pack in the battery cabinet;

[0012] The power output end is connected to the positive busbar of the external DC busbar;

[0013] A positive electrode input copper bar is arranged in the shell, and the positive electrode input end passes through the shell and is connected to the positive electrode input copper bar;

[0014] A power output copper bar is arranged in the shell, and the power output end passes through the shell and is connected to the power output copper bar;

[0015] A relay is arranged in the housing, and a first end of the relay is connected to the positive input copper busbar;

[0016] The second end of the relay is connected to the power output copper busbar;

[0017] A battery management unit is also provided in the housing;

[0018] The control end of the relay is connected to the battery management unit;

[0019] The battery management unit controls the relay to engage according to an external control instruction to charge the battery pack or output power.

[0020] On the other hand, a CAN interface is also provided on the back of the housing;

[0021] The CAN interface is electrically connected to the battery management unit;

[0022] The CAN interface is also connected to the CAN bus;

[0023] The CAN bus is connected to each of the battery packs respectively;

[0024] The CAN bus acquires the detection data of the battery pack and sends it to the battery management unit;

[0025] A diagnostic interface, the diagnostic interface being disposed on the back side of the housing;

[0026] The diagnostic interface is electrically connected to the battery management unit;

[0027] The diagnostic interface is connected to an external diagnostic device based on the CAN bus protocol;

[0028] An auxiliary interface, the auxiliary interface is arranged on the back side of the housing;

[0029] The auxiliary interface is electrically connected to the battery management unit;

[0030] The auxiliary interface includes a DC output interface, and the DC output interface takes power from the battery management unit and supplies power to the outside;

[0031] The auxiliary interface also includes a temperature feedback interface, and a temperature sensor is arranged in the housing;

[0032] The first end of the temperature sensor is connected to the temperature feedback interface;

[0033] The second end of the temperature sensor is connected to the battery management unit.

[0034] On the other hand, a power module is also provided in the housing;

[0035] The input end of the power module is connected to the AC input interface;

[0036] The AC input interface is a three-pin input interface, and the AC input interface is arranged on the back side of the housing;

[0037] The first output terminal of the power module is connected to the battery management unit to supply power to the battery management unit.

[0038] On the other hand, a 485 communication monitoring board is also provided in the housing;

[0039] The back of the housing is provided with a JTAG interface and two slave interfaces;

[0040] The JTAG interface and the slave interface are connected to the 485 communication monitoring board respectively;

[0041] The slave interface is connected to the CSC slave in the battery cabinet based on the RS485 protocol;

[0042] The slave interface receives the slave data sent by the CSC slave and inputs it into the 485 communication monitoring board;

[0043] The JTAG interface is connected to an external debugging device.

[0044] On the other hand, the front panel of the housing is provided with a display screen opening;

[0045] The display screen opening is bent inward to form an L-shaped frame structure;

[0046] The L-shaped frame structure is arranged around the display screen opening;

[0047] The display screen opening is provided with a display screen;

[0048] The information transceiver interface of the display screen is connected to the 485 communication monitoring board;

[0049] The rear panel of the housing is also provided with an RJ45 output interface;

[0050] The data output interface of the display screen is connected to the RJ45 output interface to send monitoring data to the outside;

[0051] A boost module is arranged in the housing;

[0052] The input end of the boost module is connected to the +12V power supply port of the battery management unit;

[0053] The output end of the boost module is connected to the +24V power supply port of the display screen.

[0054] On the other hand, the positive electrode input copper bar includes a straight line segment;

[0055] The first end of the straight line segment is electrically connected to the positive input terminal;

[0056] The second end of the straight line segment is fixed on the upper surface of a copper bar bracket;

[0057] The straight line segment is arranged in the housing along the horizontal direction;

[0058] The housing also includes a current sensor;

[0059] The output end of the current sensor is connected to the battery management unit;

[0060] The sensing part of the current sensor is in a ring structure;

[0061] The straight line segment passes through the annular structure;

[0062] The connection node between the straight line segment and the relay is located between the current sensor and the copper busbar support.

[0063] On the other hand, the positive input terminal and the power output terminal are arranged in sequence in the up-down direction on the back side of the shell;

[0064] The power output terminal is located above the positive input terminal;

[0065] The straight line segment also includes an avoidance segment before it;

[0066] The avoidance section extends downward from the bottom of the positive input terminal, turns to the horizontal direction at a side close to the lower surface of the shell, and turns to the front of the shell when reaching the predetermined projection position of the straight line segment, extends forward by a predetermined avoidance length, and then extends upward to connect with the straight line segment;

[0067] The power output copper bar extends downward from the bottom of the power output end and is bent to fit the rear panel of the shell, and then extends horizontally to a predetermined avoidance length and then turns to the front of the shell;

[0068] A plate-like structure is provided at the end of the power output copper bar, and a first end of the plate-like structure is fixed on the upper surface of the copper bar bracket;

[0069] The second end of the plate-like structure is connected to the relay.

[0070] On the other hand, a rectifier is provided in the relay;

[0071] The rectifier is connected in parallel to both ends of the positive electrode of the relay;

[0072] When the battery pack needs to be charged, the battery management unit detects the current signal on the rectifier and then controls the relay to close.

[0073] On the other hand, a mounting base plate is provided in the housing;

[0074] An I-shaped wire trough is provided above the installation base plate;

[0075] The positive input copper bus, the relay, the power output copper bus and the 485 communication monitoring board are arranged on one side of the wire trough;

[0076] The battery management unit is arranged on the other side of the wire trough;

[0077] The wire trough is in the shape of a hollow tube;

[0078] The side of the cable trough is provided with holes for cables to pass through.

[0079] On the other hand, the housing includes a U-shaped lower half and an upper cover;

[0080] The lower part includes a front panel, a rear panel and a bottom panel connected in sequence;

[0081] The upper cover comprises an upper panel, a left panel and a right panel.

[0082] The above technical solution has the following advantages or beneficial effects:

[0083] In view of the problem that the battery management system in the prior art supports a small number of communication interfaces and cannot meet the relevant communication needs, this solution introduces a 485 communication monitoring board, introduces relevant interfaces through the 485 communication monitoring board, and uniformly arranges them on the back of the shell, meeting the relevant signal access needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0084] The embodiments of the present invention will be described more fully with reference to the attached drawings, which are provided for illustration and description only and are not intended to limit the scope of the present invention.

[0085] Figure 1 It is an overall schematic diagram of an embodiment of the present invention;

[0086] Figure 2 is a circuit diagram of an embodiment of the present invention;

[0087] Figure 3 It is a schematic diagram of the back side of an embodiment of the present invention;

[0088] Figure 4 A schematic diagram of a copper busbar according to an embodiment of the present invention;

[0089] Figure 5 A schematic diagram of an avoidance section according to an embodiment of the present invention;

[0090] Figure 6 It is a top view of an embodiment of the present invention. DETAILED DESCRIPTION

[0091] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0092] In the description of this specification, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this specification and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this specification.

[0093] In this specification, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this specification can be understood according to specific circumstances.

[0094] Some of the blocks shown in the accompanying drawings are functional entities that do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0095] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0096] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0097] The present invention comprises:

[0098] A battery management system such as Figure 1-6 As shown, it includes a housing 1;

[0099] The back of the housing 1 is provided with a positive input terminal 21 and a power output terminal 31;

[0100] The positive input terminal 21 is connected to the positive terminal of the battery pack A1 in the battery cabinet;

[0101] The power output terminal 31 is connected to the positive busbar of the external DC busbar;

[0102] A positive electrode input copper bar 22 is arranged in the housing 1, and the positive electrode input terminal 21 passes through the housing 1 and is connected to the positive electrode input copper bar 22;

[0103] A power output copper bar 32 is arranged in the housing 1, and the power output end 31 passes through the housing 1 and is connected to the power output copper bar 32;

[0104] A relay 4 is disposed in the housing 1, and a first end of the relay 4 is connected to the positive input copper bus 22;

[0105] The second end of the relay 4 is connected to the power output copper bus 32;

[0106] A battery management unit 5 is also provided in the housing 1;

[0107] The control end of the relay 4 is connected to the battery management unit 5;

[0108] The battery management unit 5 controls the relay 4 to engage according to a control command input from the outside, so as to charge the battery pack A1 or output power.

[0109] Specifically, in order to realize the relevant functions of the energy storage system, in this embodiment, the above-mentioned battery management system is designed to perform output control.

[0110] Specifically, in a battery cabinet, multiple battery packs A1 are stacked in the height direction. Battery pack A1 is usually a lithium-ion battery module, such as a lithium iron phosphate battery pack. Multiple cells are arranged in the battery module. The cells are connected in a specific series-parallel order through copper bars in the battery module according to the voltage and current of the design specifications.

[0111] Correspondingly, in the battery cabinet, for multiple battery groups, corresponding series-parallel circuits will be constructed through copper bars to combine battery group A1, and finally obtain a positive bus and a negative bus, which are connected to the power management system at the bottom or top of the cabinet, and connected to the positive bus and negative bus of the external DC bus through the battery management system. The battery management system controls the discharge based on the external DC bus, or charges the battery group A1.

[0112] Here, in order to reduce the copper busbar design in a group of shells, in this embodiment, the negative busbar of battery pack A1 is directly connected to the external DC busbar, and only the line corresponding to the positive side is set in the battery management system.

[0113] Specifically, it includes a positive input terminal 21 and a power output terminal 31. The positive input terminal 21 is connected to the positive terminal of the battery pack A1 in the battery cabinet. The positive input terminal 21 passes through the shell 1 and is connected to the positive input copper bus 22. The positive input copper bus 22 is connected to one contact of the relay 4. The other contact of the relay 4 is connected to the power output copper bus 32. The power output terminal 31 passes through the shell 1 and is connected to the power output copper bus 32. The power output terminal 31 is connected to the positive bus of the external DC bus.

[0114] Correspondingly, the control end of the relay 4 is connected to the battery management unit 5, and the battery management unit 5 controls the relay 4 to engage according to an external control instruction to charge or output power to the battery pack A1.

[0115] The battery management unit 5 processes various data, draws conclusions, and performs related control and alarm operations according to a pre-configured computer program.

[0116] In one embodiment, a CAN interface 51 is also provided on the back of the housing 1;

[0117] The CAN interface 51 is electrically connected to the battery management unit;

[0118] The CAN interface 51 is also connected to the CAN bus;

[0119] The CAN bus is connected to each battery pack A1 separately;

[0120] The CAN bus acquires the detection data of the battery pack A1 and sends it to the battery management unit 5;

[0121] A diagnostic interface 52, which is disposed on the back of the housing;

[0122] The diagnostic interface 52 is electrically connected to the battery management unit 5;

[0123] The diagnostic interface 52 is connected to an external diagnostic device based on the CAN bus protocol;

[0124] Auxiliary interface 53, the auxiliary interface 53 is arranged on the back side of the housing;

[0125] The auxiliary interface 53 is electrically connected to the battery management unit 5;

[0126] The auxiliary interface 53 includes a DC output interface, which takes power from the battery management unit 5 and supplies power to the outside;

[0127] The auxiliary interface 53 also includes a temperature feedback interface 53A, and a temperature sensor 532A is provided in the housing;

[0128] The first end of the temperature sensor 532A is connected to the temperature feedback interface 53A;

[0129] The second end of the temperature sensor 532A is connected to the battery management unit 5 .

[0130] Specifically, in view of the problem that the number of interfaces in the prior art is small and cannot meet the relevant access requirements, in this embodiment, a large number of interfaces are integrated in the power management system to meet the relevant communication requirements.

[0131] Specifically, a CAN interface 51 is first configured in the power management system. The CAN interface 51 is connected to the battery management unit 5 on the inner side of the housing 1 and is externally connected to each battery pack A1 based on the CAN bus protocol.

[0132] A relevant monitoring device is arranged inside the battery pack A1, and various data inside the battery pack A1, such as current, temperature, voltage, smoke, etc., are then transmitted back to the CAN interface 51 through the CAN bus and sent to the battery management unit 5. The battery management unit 5 processes the various data according to the pre-configured computer program, draws conclusions, and performs relevant control and alarm operations.

[0133] The diagnostic interface 52 provides a diagnostic interface, which is connected to the diagnostic interface on the battery management unit 5 based on the CAN protocol and other pin protocols. When the battery management unit 5 needs to be diagnosed, it is connected to the corresponding external diagnostic device through the interface. The external diagnostic device runs the relevant diagnostic program or reads the various parameters stored in the battery management unit 5 to determine whether the overall system is working normally.

[0134] The auxiliary interface 53 provides a DC output and temperature feedback function. Specifically, while the power module 6 supplies power to the battery management unit 5, the battery management unit 5 has two +12V DC outputs, which can provide auxiliary power to external devices through the corresponding interface.

[0135] Furthermore, in order to effectively monitor the temperature inside the device, a temperature sensor 53A is also provided in the housing in this embodiment. The temperature sensor 53A can detect the internal temperature of the housing 1 and generate temperature detection data.

[0136] Furthermore, the temperature sensor 53A has a bidirectional data interface, one end of which is connected to a specific pin in the auxiliary interface 53, and the other end is connected to the battery management unit 5. When the temperature sensor 53A generates temperature data, it is simultaneously sent to an external auxiliary device for reading and to the battery management unit 5 for processing.

[0137] In one embodiment, a power module 6 is also provided in the housing 1;

[0138] The input end of the power module 6 is connected to the AC input interface;

[0139] The AC input interface is a three-pin input interface, and the AC input interface is arranged on the back of the housing 1;

[0140] The first output terminal of the power module 6 is connected to the battery management unit 5 to supply power to the battery management unit 5 .

[0141] Specifically, in order to effectively power the battery management unit 5 and other modules in the device, in this embodiment, a power module 6 is also configured in the housing 1. The AC input end of the power module 6 is connected to the AC input interface on the back of the housing 1. The AC input interface is a three-pin input interface, usually with a 10A specification, with a live wire, a neutral wire and a ground wire.

[0142] The power module 6 is connected to the inner side of the AC input interface through a corresponding cable, and then input into the power module 6.

[0143] The power module 6 includes a common transformer circuit, a rectifier circuit, and a control circuit. For example, an AC / DC circuit usually includes a transformer coil at the front stage, which is used to convert the 220V AC input to an input voltage that meets the input voltage of the rear stage circuit, such as 24V. A group of rectifier circuits are also provided at the rear stage of the transformer coil, which is used to convert AC power into DC power, and finally adjust the voltage to the corresponding output value, such as +12V, through the DC-DC circuit and output after removing the ripple.

[0144] In one embodiment, a 485 communication monitoring board 7 is also provided in the housing;

[0145] The back of the housing 1 is provided with a JTAG interface 54 and two slave interfaces 55;

[0146] The JTAG interface 54 and the slave interface 55 are connected to the 485 communication monitoring board 7 respectively;

[0147] The slave interface 55 is connected to the CSC slave in the battery cabinet based on the RS485 protocol;

[0148] The slave interface 55 receives the slave data sent by the CSC slave and inputs it into the 485 communication monitoring board;

[0149] The JTAG interface 54 is connected to an external debugging device.

[0150] Specifically, in view of the problem that the power management system in the prior art has few communication modes and cannot meet the relevant information interaction requirements, in this embodiment, a 485 communication monitoring board 7 is additionally provided in the housing 1 to realize the data transmission process.

[0151] Specifically, the 485 communication monitoring board 7 is an additionally provided data forwarding board with the 485 communication protocol. The 485 communication monitoring board 7 can communicate with the CSC slave and forward related data.

[0152] In the battery cabinet, multiple CSC slaves are set up. CSC is a monitor installed on the battery cell, responsible for collecting battery information in the string and transmitting it to the BMU for processing. This collection method is carried out in a collaborative way between the host and the slave.

[0153] The 485 communication monitoring board 7 is configured as the host in the CSC system, which is used to control the slaves and collect data from the slaves based on the 485 communication protocol. The CSC slave is configured in the module of the battery pack 1 and transmits messages based on the 485 bus.

[0154] The housing 1 is provided with two slave interfaces 55, which can realize data collection of two groups of 485 buses.

[0155] After the data message is collected, the 485 communication monitoring board 7 processes the data, connects to the external debugging device through the JTAG interface 54, and sends the relevant data message to the debugging device.

[0156] In one embodiment, the front panel of the housing 1 is provided with a display screen opening;

[0157] The display opening is bent inward to form an L-shaped frame structure;

[0158] An L-shaped frame structure is arranged around the display opening;

[0159] A display screen 8 is provided on the upper card of the display screen opening;

[0160] The information transceiver interface of the display screen is connected to the 485 communication monitoring board 7;

[0161] The rear panel of the housing is also provided with an RJ45 output interface 56;

[0162] The data output interface of the display screen is connected to the RJ45 output interface 56 to send monitoring data to the outside;

[0163] A boost module 51 is provided in the housing 1;

[0164] The input end of the boost module 51 is connected to the +12V power supply port of the battery management unit 5;

[0165] The output end of the boost module 51 is connected to the +24V power supply port of the display screen 8 .

[0166] Specifically, in order to achieve a better data monitoring effect, in this embodiment, a display screen 8 is further provided to display the data collected by the 485 communication monitoring board 7 .

[0167] Specifically, after the 485 communication monitoring board 7 processes the data collected from the CSC slave, it is sent to the debugging device through the JTAG interface 54. At the same time, the 485 communication monitoring board 7 also sends the collected data to the display screen 8 for display.

[0168] In order to fix the display screen 8, in this embodiment, a display screen opening is firstly provided on the front panel of the housing 1. The display screen opening is roughly rectangular, and its length and width dimensions match the dimensions of the display screen.

[0169] To fix the display screen 8, the front panel of the housing 1 is bent inward around the opening to form an L-shaped frame structure. The surrounding frame of the display screen 8 is attached to the frame structure and fixed by glue or bolts.

[0170] Various data and power supply interfaces of the display screen 8 are located on the inner side of the housing 1 for wiring, and the display direction of the display screen 8 is the true surface of the housing 1 .

[0171] In order to power the display screen 8, a boost module 51 is added to the shell 1 in the present embodiment. The boost module 51 is substantially a DC-DC circuit, which utilizes the +12V power supply port of the battery management unit 5 as the output, and boosts the +12V DC power provided by the power supply interface to form +24V DC power to drive the display screen 8.

[0172] In one embodiment, the positive input copper bar 22 includes a straight line segment 221;

[0173] The first end of the straight line segment 221 is electrically connected to the positive input terminal 21;

[0174] The second end of the straight section 221 is fixed on the upper surface of a copper bar bracket 23;

[0175] The straight line segment 221 is arranged in the housing 1 along the horizontal direction;

[0176] The housing 1 also includes a current sensor 9;

[0177] The output end of the current sensor 9 is connected to the battery management unit 5;

[0178] The sensing part of the current sensor 9 is in a ring-shaped structure;

[0179] The straight line segment 221 passes through the ring structure;

[0180] The connection node between the straight line segment 221 and the relay 4 is located between the current sensor 9 and the copper busbar support 23 .

[0181] Specifically, in order to effectively monitor the current flowing through the positive bus, in this embodiment, a current sensor 9 is also provided in the shell 1, and the output end of the current sensor 9 is connected to the battery management unit 5. The current sensor 9 detects the current on the positive bus and sends it to the battery management unit 5.

[0182] Specifically, in this solution, the path of the positive busbar includes: the positive input terminal 21 is connected to the positive terminal of the battery pack A1 in the battery cabinet, the positive input terminal 21 passes through the shell 1 and is connected to the positive input copper busbar 22, the positive input copper busbar 22 is connected to one contact of the relay 4, and the other contact of the relay 4 is connected to the power output copper busbar 32, the power output terminal 31 passes through the shell 1 and is connected to the power output copper busbar 32, and the power output terminal 31 is connected to the positive busbar of the external DC bus.

[0183] In order to achieve a more stable access effect, in this embodiment, the positive input copper busbar 22 is first set to have a structure with a straight line segment 221, and the straight line segment 221 is arranged in the middle part of the shell 1 along the horizontal direction, and the rear end is connected to the positive input terminal 21, and the front end is connected to the copper busbar bracket 23.

[0184] The copper bar support 23 is a long cubic structure formed on the bottom plate of the housing 1 and is located in the central area of ​​the bottom plate of the housing 1. It has a certain height, which is usually matched with the height of the relay 4.

[0185] A screw hole is provided at one end of the straight section 221 facing forward, and the end is placed on the copper bar bracket 23 and fixed by tightening with screws.

[0186] The relay 4 is installed at a certain position between the positive input terminal 21 and the copper busbar bracket 23, and the contacts of the relay 4 are arranged upward. The straight section 221 is provided with another mounting hole at this point, and the terminal of the contact of the relay 4 passes through and is fixed by screws.

[0187] Accordingly, in order to sense the current, a current sensor 9 is provided between the relay 4 and the positive input terminal 21 to detect the current on the positive input copper bus 22 .

[0188] Specifically, the current sensor 9 is a current sensor implemented based on the principle of induced current, and its sensing part has a closed annular current loop, and the positive input copper bus 22 passes through the closed current loop so that a corresponding induced current is generated in the current loop.

[0189] In this embodiment, the annular closed conductor structure of the current sensor 9 is arranged in the vertical direction, and its axial direction is arranged in the front-to-back direction in the housing 1. Accordingly, the straight segment 221 directly passes through the annular structure. When the relay 4 is turned on, a corresponding induced current is generated in the current loop, so that the current sensor 9 can obtain the current flowing through the straight segment 221 by measuring the induced current.

[0190] Based on the above arrangement, a relatively compact equipment layout can be achieved.

[0191] In one embodiment, the positive input terminal 21 and the power output terminal 331 are arranged in sequence in the up-down direction on the back side of the housing 1;

[0192] The power output terminal 31 is located above the positive input terminal 21;

[0193] The straight line segment 221 also includes an avoidance segment 222;

[0194] The avoidance section 222 extends downward from the bottom of the positive input terminal 21, turns to the horizontal direction at a side close to the lower surface of the housing 1, and turns to the front of the housing 1 when reaching the predetermined projection position of the straight section 221, extends forward to a predetermined avoidance length, and then extends upward to connect with the straight section 221;

[0195] The power output copper bar 32 extends downward from the bottom of the power output end 31 and is bent to fit the rear panel of the housing 1, and then extends horizontally to a predetermined avoidance length and then turns to the front of the housing 1;

[0196] A plate-like structure 321 is provided at the end of the power output copper bar 32, and a first end of the plate-like structure 321 is fixed on the upper surface of the copper bar bracket 23;

[0197] The second end of the plate-shaped structure 321 is connected to the relay 4 .

[0198] Specifically, in order to achieve a more compact equipment layout and the need to avoid strong and weak electricity, in this embodiment, the positive input terminal 21 and the power output terminal 331 are arranged on the back of the shell 1, arranged in sequence in the up and down directions, and the power output terminal 31 is located above the positive input terminal 21.

[0199] Meanwhile, the positive input terminal 21 and the power output terminal 331 are relatively close to the side surface of the housing 1 at the back side.

[0200] When wiring, the positive DC busbar of the battery pack A1 is wound around the bottom of the cabinet and then connected upward to the positive input terminal 21, and the positive busbar of the external DC busbar is wound out from the side and connected to the outside.

[0201] The above settings will cause two problems:

[0202] 1. The positions of the positive input terminal 21 and the power output terminal 331 are too close to the side of the housing 1, which makes it relatively difficult to arrange the relay 4 and the current sensor 9.

[0203] To address this problem, in this solution, the power output copper busbar 32 and the positive input copper busbar 22 are extended laterally for a certain distance, so that the position of the copper busbar is closer to the middle position of the housing 1 relative to the position of the input and output ends, and then bent forward to connect the relay 4.

[0204] Specifically, regarding the positive input side, it first extends downward from the bottom of the positive input terminal 21, turns to the horizontal direction at the side close to the lower surface of the housing 1, and turns to the front of the housing 1 when reaching the predetermined projection position of the straight line segment 221, extends forward by a predetermined avoidance length, and then extends upward to connect with the straight line segment 221;

[0205] Regarding the power output side, it extends downward from the bottom of the power output end 31 and is bent in contact with the rear panel of the housing 1 , and then extends horizontally to a predetermined avoidance length and then turns to the front of the housing 1 .

[0206] The above wiring method allows the copper busbar to be moved as a whole to the middle of the housing 1, which facilitates the arrangement of other modules in the housing while meeting external wiring requirements.

[0207] 2. The positive input terminal 21 and the power output terminal 331 are arranged up and down, resulting in the copper bus being relatively close to each other, which may not meet the insulation requirements.

[0208] To address this problem, the solution selected in this solution is to increase the distance between the two groups of copper busbars by adding an avoidance section 222 .

[0209] The avoidance section 222 extends downward from below the positive input terminal 21 , turns to the horizontal direction at a side close to the lower surface of the housing 1 , and turns to the front of the housing 1 when reaching a predetermined projection position of the straight section 221 .

[0210] At this time, in order to meet the insulation requirements, the avoidance section 222 will not be stretched directly upward, but will be extended forward by a predetermined avoidance length and then extended upward to connect with the straight line section 221 .

[0211] Correspondingly, the power output copper busbar 32 moves laterally in contact with the rear panel of the shell 1. When passing the copper busbar on the positive input side, there is a gap between the two determined by a preset avoidance length, thereby meeting the relevant insulation requirements.

[0212] Furthermore, in order to achieve a better fixation of the power output copper busbar 32, the tail end structure of the power output copper busbar 32 is adjusted to a plate-like structure 321 in this embodiment. The plate-like structure 321 is roughly rectangular. The first end of the plate-like structure 321 is fixed to the upper surface of the copper busbar bracket 23, and the second end of the plate-like structure 321 is connected to the relay 4.

[0213] In one embodiment, a rectifier 41 is provided in the relay 4;

[0214] The rectifier 41 is connected in parallel to both ends of the positive electrode of the relay 4;

[0215] When the battery pack needs to be charged, the battery management unit detects the current signal on the rectifier 41 and then controls the relay to close.

[0216] Specifically, in order to achieve a better control effect on the charging process, in this embodiment, a rectifier 41 is provided in the relay 4, and the rectifier 41 is connected in parallel to both ends of the positive electrode of the relay 4;

[0217] Based on the above configuration, the battery pack A1 can be autonomously discharged to the external load without any control. When the user closes the main switch, the battery pack A1 can be directly controlled to supply power.

[0218] And, when the battery pack needs to be charged, the battery management unit detects the current signal on the rectifier 41 and then controls the relay to close, so as to finally allow the battery pack A1 to be charged.

[0219] In one embodiment, a mounting base plate 11 is provided in the housing 1;

[0220] An I-shaped wire trough 12 is provided above the installation base plate 11;

[0221] A positive input copper busbar 22, a relay 4, a power output copper busbar 32 and a 485 communication monitoring board 7 are arranged on one side of the wire trough 12;

[0222] A battery management unit 5 is provided on the other side of the wire slot 12;

[0223] The wire duct 12 is in the shape of a hollow tube;

[0224] The side of the cable trough 12 is provided with holes for cables to pass through.

[0225] Specifically, in order to achieve a better layout effect inside the device, in this embodiment, a mounting base plate 11 is provided inside the housing 1 , and all devices are mounted on the mounting base plate 11 .

[0226] Specifically, an I-shaped wire trough 12 is provided on the mounting base plate 11, and a positive input copper busbar 22, a relay 4, a power output copper busbar 32 and a 485 communication monitoring board 7 are provided on one side of the wire trough 12, and a battery management unit 5 is provided on the other side.

[0227] The cable duct is in the shape of a hollow tube, with a cross-section roughly in the shape of a cuboid, and holes are provided on the sides to allow cables to pass through.

[0228] In one embodiment, the housing 1 includes a U-shaped lower half 13 and an upper cover;

[0229] The lower part includes a front panel, a rear panel and a bottom panel connected in sequence;

[0230] The upper cover comprises an upper panel, a left panel and a right panel.

[0231] Specifically, in order to achieve better maintainability, in this embodiment, the housing 1 is configured to be composed of a U-shaped lower half 13 and an upper cover. The upper cover can be quickly removed by splicing the upper and lower covers, which is convenient for maintenance.

[0232] The terms used in the embodiments of this specification are only for the purpose of describing specific embodiments and are not intended to limit this specification. Unless otherwise defined, the technical terms or scientific terms used in the embodiments of this specification should be understood by people with ordinary skills in the field to which this specification belongs. The words "first", "second" and similar words used in this specification and claims do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantitative limit, but indicate that there is at least one. "Multiple" or "several" means two or more. Unless otherwise specified, words such as "front", "rear", "lower" and / or "upper" are only for the convenience of explanation and are not limited to one position or one spatial orientation. Words such as "include" or "comprise" mean that the elements or objects appearing in front of "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, and can include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a", "an", "said", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0233] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery management system, characterized in that: including a housing; The back side of the shell is provided with a positive input terminal and a power output terminal; The positive input terminal is connected to the positive terminal of the battery pack in the battery cabinet; The power output end is connected to the positive busbar of the external DC busbar; A positive electrode input copper bar is arranged in the shell, and the positive electrode input end passes through the shell and is connected to the positive electrode input copper bar; A power output copper bar is arranged in the shell, and the power output end passes through the shell and is connected to the power output copper bar; A relay is arranged in the housing, and a first end of the relay is connected to the positive input copper busbar; The second end of the relay is connected to the power output copper busbar; A battery management unit is also provided in the housing; The control end of the relay is connected to the battery management unit; The battery management unit controls the relay to engage according to an external control instruction to charge the battery pack or output power.

2. The battery management system according to claim 1, characterized in that: A CAN interface is also provided on the back of the housing; The CAN interface is electrically connected to the battery management unit; The CAN interface is also connected to the CAN bus; The CAN bus is connected to each of the battery packs respectively; The CAN bus acquires the detection data of the battery pack and sends it to the battery management unit; A diagnostic interface, the diagnostic interface being disposed on the back side of the housing; The diagnostic interface is electrically connected to the battery management unit; The diagnostic interface is connected to an external diagnostic device based on the CAN bus protocol; An auxiliary interface, the auxiliary interface is arranged on the back side of the housing; The auxiliary interface is electrically connected to the battery management unit; The auxiliary interface includes a DC output interface, which takes power from the battery management unit and supplies power to the outside; The auxiliary interface also includes a temperature feedback interface, and a temperature sensor is provided in the housing; The first end of the temperature sensor is connected to the temperature feedback interface; The second end of the temperature sensor is connected to the battery management unit.

3. The battery management system according to claim 1, characterized in that: A power module is also provided in the housing; The input end of the power module is connected to the AC input interface; The AC input interface is a three-pin input interface, and the AC input interface is arranged on the back side of the housing; The first output terminal of the power module is connected to the battery management unit to supply power to the battery management unit.

4. The battery management system according to claim 3, characterized in that: A 485 communication monitoring board is also provided in the housing; The back of the housing is provided with a JTAG interface and two slave interfaces; The JTAG interface and the slave interface are connected to the 485 communication monitoring board respectively; The slave interface is connected to the CSC slave in the battery cabinet based on the RS485 protocol; The slave interface receives the slave data sent by the CSC slave and inputs it into the 485 communication monitoring board; The JTAG interface is connected to an external debugging device.

5. The battery management system according to claim 4, characterized in that: The front panel of the housing is provided with a display screen opening; The display screen opening is bent inward to form an L-shaped frame structure; The L-shaped frame structure is arranged around the display screen opening; The display screen opening is provided with a display screen; The information transceiver interface of the display screen is connected to the 485 communication monitoring board; The rear panel of the housing is also provided with an RJ45 output interface; The data output interface of the display screen is connected to the RJ45 output interface to send monitoring data to the outside; A boost module is arranged in the housing; The input end of the boost module is connected to the +12V power supply port of the battery management unit; The output end of the boost module is connected to the +24V power supply port of the display screen.

6. The battery management system according to claim 1, characterized in that: The positive electrode input copper bar includes a straight line segment; The first end of the straight line segment is electrically connected to the positive input terminal; The second end of the straight line segment is fixed on the upper surface of a copper bar bracket; The straight line segment is arranged in the housing along the horizontal direction; The housing also includes a current sensor; The output end of the current sensor is connected to the battery management unit; The sensing part of the current sensor is in a ring structure; The straight line segment passes through the annular structure; The connection node between the straight line segment and the relay is located between the current sensor and the copper busbar support.

7. The battery management system according to claim 6, characterized in that: The positive input terminal and the power output terminal are arranged in sequence in an up-down direction on the back side of the shell; The power output terminal is located above the positive input terminal; The straight line segment also includes an avoidance segment before it; The avoidance section extends downward from the bottom of the positive input terminal, turns to the horizontal direction at a side close to the lower surface of the shell, and turns to the front of the shell when reaching the predetermined projection position of the straight line segment, extends forward by a predetermined avoidance length, and then extends upward to connect with the straight line segment; The power output copper bar extends downward from the bottom of the power output end and is bent to fit the rear panel of the shell, and then extends horizontally to a predetermined avoidance length and then turns to the front of the shell; A plate-like structure is provided at the end of the power output copper bar, and a first end of the plate-like structure is fixed on the upper surface of the copper bar bracket; The second end of the plate-like structure is connected to the relay.

8. The battery management system according to claim 1, characterized in that: A rectifier is provided in the relay; The rectifier is connected in parallel to both ends of the positive electrode of the relay; When the battery pack needs to be charged, the battery management unit detects the current signal on the rectifier and then controls the relay to close.

9. The battery management system according to claim 5, characterized in that: A mounting base plate is provided in the housing; An I-shaped wire trough is provided above the installation base plate; The positive input copper bus, the relay, the power output copper bus and the 485 communication monitoring board are arranged on one side of the wire trough; The battery management unit is arranged on the other side of the wire trough; The wire trough is in the shape of a hollow tube; The side of the cable trough is provided with holes for cables to pass through.

10. The battery management system according to claim 1, characterized in that: The housing comprises a U-shaped lower part and an upper cover; The lower part includes a front panel, a rear panel and a bottom panel connected in sequence; The upper cover comprises an upper panel, a left panel and a right panel.

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