Power management system module

Abstract

The invention relates to the technical field of energy storage systems, in particular to a power management system module and a battery cabinet, which comprises a shell, a neutral line input end, a power system output end and a neutral line copper bar, the neutral line input end is connected with a neutral line copper bar; the other end of the neutral line copper bar is connected with the neutral end of the power supply system output end; the neutral line input end is connected with neutral points of the two battery packs. Aiming at the problems that a switch box of an energy storage system in the prior art only provides positive and negative electrode output, and if neutral line output needs to be provided, two groups of battery cabinets need to be combined, a power management system module and circuits in the battery cabinets are improved. Neutral line copper bars and corresponding input and output ends are added in the power management system module. On the basis, the neutral point of the battery pack in the battery cabinet is electrified, so that neutral line output in the cabinet is realized, paired battery cabinets do not need to be arranged, and the overall volume of the system is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage systems, and in particular to a power management system module. 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 CN201510901711.0 discloses an uninterruptible power supply, including: a battery for storing electric energy and outputting electric energy to the outside; a battery management circuit, the battery management circuit is used to control the charging and discharging of the battery; it is characterized in that it also includes a DC input and output circuit; the DC input and output circuit is connected to the battery through the battery management circuit, and is used to output the DC voltage of the battery to the outside, and the DC input and output circuit is also used to transmit the external DC voltage to the battery to charge the battery. The uninterruptible power supply provided by the present invention has a dual power supplement mechanism of AC and DC input, which can charge the battery pack with AC mains power or DC power. It also has a dual power supply function of AC and DC output.

[0005] For another example, Chinese patent CN200910109260.1 discloses an uninterruptible power supply, including a switching module, a power factor correction module, a first bus capacitor, a second bus capacitor and an inverter module, wherein the power factor correction module includes a first inductor, a first switch tube, a second switch tube, a first diode, a third diode, a second inductor, a third switch tube, a fourth switch tube, a second diode and a fourth diode; the first output of the switching module is coupled to the negative electrode of the first bus capacitor via the first inductor, the first switch tube and the second switch tube in sequence, the anode of the first diode is coupled between the first inductor and the first switch tube, and the cathode is coupled to the positive electrode of the first bus capacitor, the cathode of the third diode is coupled to the anode of the first diode, and the anode of the third diode is coupled to the negative electrode of the second bus capacitor. In the present invention, the same inductor is used for both the positive and negative half cycles of the mains power, which improves the utilization rate of the inductor and saves costs. The scheme uses fewer inductors and diodes, has lower costs and higher efficiency.

[0006] However, in the actual implementation process, the inventors found that the existing uninterruptible power supply system, such as the uninterruptible power supply system designed by a certain manufacturer, needs to set an intermediate point N, that is, the neutral line output, for its power management module. The battery cabinet integrated in the system usually only has a simple battery pack switch and positive and negative output functions, and an additional device needs to be set outside the cabinet to connect one pair of positive and negative poles of the two groups of battery cabinets respectively, so as to form a neutral line output. This results in the need for 2 battery cabinets, 2 BMS-C3 high-voltage packages, 2 battery switch box assemblies-E1, and 2 sets of 6mm thick copper busbars when the system is deployed. While the area occupied on site is doubled, the integration process time will also be doubled. Summary of the invention

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

[0008] The specific technical solutions are as follows:

[0009] A power management system module, wherein the power management system module is arranged in a battery cabinet;

[0010] The power management system module includes a housing;

[0011] A neutral line input terminal is provided at an upper portion of the outer side of the front panel of the housing;

[0012] The lower portion of the outer side of the front panel is provided with a power system output terminal;

[0013] A neutral copper bar is arranged in the housing;

[0014] The neutral line input end passes through the front panel and is connected to the neutral line copper busbar;

[0015] The other end of the neutral copper bar is connected to the neutral end of the output end of the power supply system;

[0016] The neutral line input end is connected to a positive and a negative of two half-cycle groups of the battery group in the battery cabinet as a neutral point.

[0017] On the other hand, the housing further includes: a positive copper bar, a negative copper bar and a battery pack switch;

[0018] The battery pack switch is fixed to the middle part of the inner side of the front panel;

[0019] The upper portion of the outer side of the front panel is also provided with a positive input terminal and a negative input terminal respectively;

[0020] The positive copper bar comprises a first positive copper bar and a second positive copper bar;

[0021] The positive electrode input terminal passes through the front panel and is connected to the first end of the first positive electrode copper busbar;

[0022] The second end of the first positive copper busbar is connected to the positive input end of the battery pack switch;

[0023] The first end of the second positive copper bar is connected to the positive output end of the battery pack switch;

[0024] The output end of the power system passes through the positive electrode panel, and the second end of the second positive copper bar is connected to the positive end of the output end of the power system;

[0025] The negative electrode copper bar comprises a first negative electrode copper bar and a second negative electrode copper bar;

[0026] The negative electrode input terminal passes through the negative electrode panel and is connected to the first end of the first negative electrode copper bar;

[0027] The second end of the first negative copper bar is connected to the negative input end of the battery pack switch;

[0028] The first end of the second negative copper bar is connected to the negative output end of the battery pack switch;

[0029] The output end of the power system passes through the negative electrode panel, and the second end of the second negative electrode copper busbar is connected to the negative end of the output end of the power system.

[0030] On the other hand, the housing includes a housing partition;

[0031] The shell partition is arranged in the shell in a horizontal direction;

[0032] The housing partition is provided with a battery switch notch at a position close to the battery switch;

[0033] The positive input terminal and the negative input terminal of the battery pack switch are located above the battery pack switch;

[0034] The first positive copper bar and the first negative copper bar are located above the housing separator;

[0035] The positive output terminal and the negative output terminal of the battery pack switch are located below the housing partition;

[0036] The second positive copper bar and the second negative copper bar are located below the housing partition.

[0037] On the other hand, the housing partition is provided with a wiring harness notch on a side away from the battery pack switch;

[0038] The wiring harness notch is a rounded rectangular hole;

[0039] The rounded rectangular hole is provided with a circuit board bracket on the long side near the battery pack switch;

[0040] The circuit board bracket extends downward from the housing partition;

[0041] The circuit board bracket is provided with a battery management unit on a side away from the battery pack switch;

[0042] The wiring harness interface of the battery management unit is arranged upwardly toward the circular rectangular hole;

[0043] A plurality of external interfaces are respectively arranged above the back panel of the housing and on the front panel;

[0044] The wiring harness interfaces are connected to the external interfaces respectively.

[0045] On the other hand, the external interface includes:

[0046] A CAN bus interface, the CAN bus interface is connected to each of the battery packs and collects battery diagnostic information of the battery packs;

[0047] An Ethernet interface, the Ethernet interface being connected to an external Ethernet device;

[0048] A display screen interface, the display screen interface is connected to the display screen of the battery cabinet and outputs battery display information;

[0049] A dry contact interface, wherein the dry contact interface is connected to an output interface of a power management module in the cabinet;

[0050] The power management module reads the dry contact signal through the dry contact interface.

[0051] On the other hand, the first negative electrode copper bar comprises a copper bar first portion and a copper bar second portion;

[0052] The first portion of the copper busbar is shovel-shaped when viewed from above;

[0053] The narrow end of the first part of the copper busbar is connected to the negative input terminal;

[0054] The housing partition is provided with a current sensor bracket at a position corresponding to the narrow end;

[0055] A current sensor is arranged above the current sensor bracket;

[0056] The current sensor is in a ring shape, and the narrow end passes through the current sensor;

[0057] The current sensor is electrically connected to the battery management unit;

[0058] The current sensor samples the current on the first negative copper bus to form a current sampling signal which is input into the battery management unit;

[0059] The housing partition is provided with a copper bar auxiliary bracket at a position corresponding to the wide end of the first portion of the copper bar;

[0060] The wide end is fixed on the copper bar auxiliary bracket;

[0061] The housing partition is provided with a relay on one side of the copper bar auxiliary bracket close to the front panel;

[0062] The first end of the relay is arranged upward and connected to the wide end;

[0063] The second end of the relay is arranged upward and connected to the second part of the copper busbar;

[0064] The first end of the second part of the copper bar is fixed to the copper bar auxiliary bracket;

[0065] The second end of the second part of the copper busbar is connected to the battery pack switch;

[0066] The control end of the relay is connected to the battery management unit;

[0067] The relay is provided with a rectifier, the rectifier is connected in parallel to both ends of the positive electrode of the relay, and the rectifier is controlled by the battery management unit;

[0068] The battery management unit controls the relay to close to charge the battery pack after pre-checking the rectifier.

[0069] On the other hand, the neutral line input terminal is arranged to be aligned with the neutral terminal of the power system output terminal in the vertical direction;

[0070] The housing partition is provided with a neutral line avoidance opening at a position corresponding to the neutral line copper bar;

[0071] The neutral copper bar is vertically arranged between the neutral input end and the power system output end.

[0072] On the other hand, the positive copper bar further includes a third positive copper bar;

[0073] The positive input terminal of the battery pack switch includes a first positive input terminal and a second positive input terminal;

[0074] The positive output terminal of the battery pack switch includes a first positive output terminal and a second positive output terminal;

[0075] The first positive input terminal and the first positive output terminal, and the second positive input terminal and the second positive output terminal are arranged in pairs;

[0076] The first positive electrode copper busbar is connected to the first positive electrode input terminal;

[0077] The first end of the third positive copper busbar is connected to the first positive output end;

[0078] The second end of the third positive copper bar is passed from the back of the battery pack switch to the top of the battery pack switch to connect to the second positive input end;

[0079] The second positive electrode copper busbar is connected to the second positive electrode output terminal.

[0080] On the other hand, it also includes a boost module;

[0081] The boost module is connected between the battery management unit and the display interface;

[0082] The boost module receives the 12V voltage output by the battery management unit and boosts it to 24V and outputs it to the display screen interface for power supply.

[0083] The above technical solution has the following advantages or beneficial effects:

[0084] In view of the problem that the switch box of the energy storage system in the prior art only provides positive and negative outputs, and two groups of battery cabinets need to be combined if a neutral line output is required, this solution improves the circuits in the power management system module and the battery cabinet. By adding a neutral copper bus and corresponding input and output terminals in the power management system module, a neutral line output in a power management system module is achieved. On this basis, the neutral point of the battery group in the battery cabinet is powered, thereby achieving a neutral line output in the cabinet. There is no need to set up paired battery cabinets, which reduces the overall volume of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0085] 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.

[0086] Figure 1 A schematic diagram of battery cabinet wiring according to an embodiment of the present invention;

[0087] Figure 2 is a schematic diagram of the front panel of the power management module in an embodiment of the present invention;

[0088] Figure 3 This is a schematic diagram of the internal device of the power management module in an embodiment of the present invention;

[0089] Figure 4 This is a schematic diagram of the other side of the internal device of the power management module in an embodiment of the present invention;

[0090] Figure 5 Schematic diagram of the internal device of the power management module in the 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] 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.

[0093] 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.

[0094] The present invention comprises:

[0095] A power management system module, such as Figures 1 to 4 As shown, the power management system module A1 is arranged in the battery cabinet;

[0096] The power management system module A1 comprises a housing 1;

[0097] A neutral line input terminal 12 is provided at the upper portion of the outer side of the front panel 11 of the housing 1;

[0098] The lower portion of the outer side of the front panel 11 is provided with a power system output terminal 13;

[0099] A neutral copper bar 2 is arranged in the housing 1;

[0100] The neutral line input terminal 12 passes through the front panel and is connected to the neutral line copper bus 2;

[0101] The other end of the neutral copper bar 2 is connected to the neutral end of the power system output terminal 13;

[0102] The neutral line input terminal 12 is connected to a positive and a negative of two half-cycle groups of the battery group in the battery cabinet as a neutral point.

[0103] Specifically, in view of the problem that the switch box of the energy storage system in the prior art only provides positive and negative electrode outputs, and two groups of battery cabinets need to be combined when a neutral line output is required, in this embodiment, the circuits of the power management system module A1 and the battery group A3 in the battery cabinet are improved, thereby realizing the neutral line output in the cabinet, eliminating the need to set up paired battery cabinets, and reducing the overall volume of the system.

[0104] Specifically, the improvements can be divided into two parts. One part is the improvement of the circuit of the battery pack A3, and the other part is a new power management system module A1 designed for this scenario.

[0105] In the prior art, in order to achieve the output of uninterruptible power supply, multiple battery packs are usually stacked in the battery cabinet along the height direction, usually lithium-ion battery modules, such as lithium iron phosphate battery packs. Multiple battery cells are arranged in the battery module, and the battery cells are connected in a specific series and parallel sequence through copper bars in the battery module according to the voltage and current of the design specifications;

[0106] Correspondingly, in the battery cabinet, for multiple battery groups, corresponding series-parallel circuits will be constructed through copper bars to combine the battery group A3, and finally obtain a positive bus bar and a negative bus bar, which are connected to the power management module at the bottom or top of the cabinet, and connected to the external power grid through the power management module.

[0107] The power management module usually controls the charging of the battery pack A3, controls the inverter to output when the external power grid is interrupted, switches off, and monitors voltage and current information.

[0108] To achieve neutral line output, the conventional method is usually to set up a pair of battery cabinets, which have two positive outputs and two negative outputs. One pair of positive output and negative output is selected for short-circuiting, thereby leading to a neutral line output, and the remaining pair of positive output and negative output is used as a normal DC output bus.

[0109] In order to realize the output in the battery cabinet, the circuit of the battery pack A3 is first improved in this embodiment. Generally, multiple battery packs A3 are output in series, and there must be a connection between the positive and negative electrodes of at least two battery packs A3. For this connection position, a three-way copper bus is set, that is, the first end and the second end of the copper bus are respectively connected to the positive and negative electrodes of the battery pack A3, and the fork of the third end is used as the neutral point.

[0110] A corresponding connecting wire or copper bus is provided for the neutral point, and connected to the neutral line input terminal 12 of the power management system module A1 to realize the neutral line output.

[0111] Accordingly, on the basis of the above circuit, in order to realize the neutral line output, the power management module A1 is also improved in this embodiment, and a neutral line input terminal 12 is set. The neutral line input terminal 12 passes through the front panel and is connected to one end of the neutral line copper bus 2. The other end of the neutral line copper bus 2 is connected to the neutral end of the power system output terminal 13 to realize the neutral line output.

[0112] The above devices constitute a battery pack system, which can be accommodated in a 600*800*2000mm cabinet.

[0113] In one embodiment, the housing 1 further includes: a positive copper bar 3, a negative copper bar 4 and a battery pack switch 9;

[0114] The battery pack switch 9 is fixed to the inner middle part of the front panel 11;

[0115] The battery pack switch 9 cuts off the high voltage under overload conditions;

[0116] The upper portion of the outer side of the front panel 11 is also provided with a positive input terminal 17 and a negative input terminal 18;

[0117] The positive copper bar 3 includes a first positive copper bar 31 and a second positive copper bar 32;

[0118] The positive input terminal 17 passes through the front panel 11 and is connected to the first end of the first positive copper busbar 31;

[0119] The second end of the first positive copper busbar 31 is connected to the positive input end of the battery pack switch 9;

[0120] A first end of the second positive copper busbar 32 is connected to the positive output end of the battery switch 9;

[0121] The power system output terminal 13 passes through the front panel 11, and the second end of the second positive copper busbar 32 is connected to the positive end of the power system output terminal 13;

[0122] The negative electrode copper bar 4 includes a first negative electrode copper bar 41 and a second negative electrode copper bar 42;

[0123] The negative input terminal 18 passes through the negative panel 11 and is connected to the first end of the first negative copper busbar 41;

[0124] The second end of the first negative copper bar 41 is connected to the negative input end of the battery switch 9;

[0125] A first end of the second negative copper busbar 42 is connected to the negative output end of the battery switch 9;

[0126] The power system output terminal 13 passes through the front panel 11 , and the second end of the second negative copper busbar 42 is connected to the negative end of the power system output terminal 13 .

[0127] Specifically, in order to realize the positive and negative bus output function of the power management module A1, in this embodiment, a positive input terminal 17 and a negative input terminal 18 are also provided. After the battery pack A3 is connected in series, the positive copper busbar of the battery pack is connected to the positive input terminal 17 for access, and the negative copper busbar of the battery pack is connected to the negative input terminal 18 for access.

[0128] In the power management module A1 , the positive copper bar 3 includes a first positive copper bar 31 and a second positive copper bar 32 , and the negative copper bar 4 includes a first negative copper bar 41 and a second negative copper bar 42 .

[0129] The first positive copper bar 31 is connected to the positive input terminal of the battery pack switch 9, and the first negative copper bar 41 is connected to the negative input terminal of the battery pack switch 9. The positive input terminal and the negative input terminal are both controlled by the "knife" of the battery pack switch 9. The battery pack switch 9 is provided with a lever on the outside of the front panel 11, which is used to switch the closing or opening of the "knife". When closed, the positive input terminal is connected to the positive output terminal, and the negative input terminal is connected to the negative output terminal.

[0130] Subsequently, the second positive copper busbar 32 is connected to the positive end of the power system output terminal 13 for output, and the second negative copper busbar 42 is connected to the negative end of the power system output terminal 13 for output.

[0131] The battery pack switch 9 is preferably an ABB brand circuit breaker (ABB-T5N 630DC TMA500 3PFF), and the model can be replaced according to different usage scenarios. It has high-voltage breaking capacity to achieve overload circuit disconnection, protect the battery pack and components from damage, and achieve safe use. And it can feed back the signal to the BMU through the feedback device of the circuit breaker to know the circuit breaker status.

[0132] In one embodiment, the housing 1 includes a housing partition 19;

[0133] The housing partition 19 is arranged in the housing in a horizontal direction;

[0134] The housing partition 19 is provided with a battery switch notch at a position close to the battery switch 9;

[0135] The positive input terminal and the negative input terminal of the battery pack switch 9 are located above the battery pack switch 9;

[0136] The first positive copper bar 31 and the first negative copper bar 31 are located above the housing separator 19;

[0137] The positive output terminal and the negative output terminal of the battery pack switch 9 are located below the housing partition 19;

[0138] The second positive copper bar 32 and the second negative copper bar 42 are located below the case separator 19 .

[0139] Specifically, in order to achieve better electrical safety, a shell partition 19 is also provided in this embodiment. The shell partition 19 is arranged in the shell in the horizontal direction, and is used to divide the upper and lower parts of the shell 1. Generally speaking, the upper half of the divided shell 1 is configured as the front circuit of the battery pack switch 9, and the lower half of the shell 1 is configured as the rear circuit of the battery pack switch 9. Then the first positive copper bar 31 and the first negative copper bar 31, as well as the corresponding positive input terminal and negative input terminal of the battery pack switch 9 are all located above the shell partition 19; the second positive copper bar 32 and the second negative copper bar 42, as well as the corresponding positive output terminal and negative output terminal of the battery pack switch 9 are all located below the shell partition 19.

[0140] In one embodiment, the housing partition 19 is provided with a wiring harness notch on a side away from the battery pack switch;

[0141] The harness notch is a rectangular hole with rounded corners;

[0142] A circuit board bracket 191 is provided on the long side of the rounded rectangular hole near the battery pack switch;

[0143] The circuit board bracket 191 extends downward from the housing partition 19;

[0144] The circuit board bracket 192 is provided with a battery management unit on a side away from the battery pack switch;

[0145] The harness interface 51 of the battery management unit 5 is arranged upward toward the circular rectangular hole;

[0146] A plurality of external interfaces 6 are respectively provided above the back panel and the front panel of the housing 1;

[0147] The harness interfaces 51 are connected to the external interfaces 6 , respectively.

[0148] Specifically, in order to achieve better control effects, in this embodiment, a battery management unit 5 is added in the shell 1 to realize functions such as controlling the charging of the battery pack A3, controlling the inverter to output when the external power grid is interrupted, switching off, and monitoring voltage and current information.

[0149] In order to achieve a more compact device volume, the battery management unit 5 is installed vertically. Since the front panel of the housing 1 is mainly used to configure the copper busbar and the battery pack switch 9, the rear space is relatively large. At this time, a circuit board bracket 191 is extended from the bottom of the housing partition 19, and then the battery management unit 5 is arranged on the side of the circuit board bracket 191 away from the battery pack switch 9, thereby achieving better isolation requirements for strong and weak electricity and a more compact device volume.

[0150] Correspondingly, at the position corresponding to the circuit board bracket 191, the shell partition 19 is provided with a wiring harness gap, which is a rounded rectangular hole. When designing the circuit board of the battery management unit 5, the wiring harness interface 51 is concentrated on this side and then connected to the external interface 6.

[0151] In one embodiment, the external interface 6 comprises:

[0152] A CAN bus interface 61, the CAN bus interface 61 is connected to each battery pack A3 and collects battery diagnostic information of the battery pack A3;

[0153] Ethernet interface 62, Ethernet interface 62 is connected to an external Ethernet device;

[0154] Display screen interface 63, display screen interface 63 is connected to the display screen of the battery cabinet and outputs battery display information;

[0155] The dry contact interface 64 is connected to an external DC power supply device.

[0156] Specifically, in order to achieve better output effects, in this embodiment, various external interfaces 6 are also configured to meet control requirements.

[0157] Specifically, each battery pack A3 and the BMS module are connected to the CAN bus interface 61 via the CAN bus, so that the power management module can collect data from sensors in each battery.

[0158] The Ethernet interface 62 is divided into two parts. One part is connected to the power management module A1 and is used to interact with external Ethernet devices, such as the BMS module A4 in the cabinet, to execute simple remote control commands and data collection, etc. The other part is connected to the display screen of the cabinet for unified display and transmission of data.

[0159] The dry contact interface 64 is connected to an external DC power supply device to supply power to the power management module A1.

[0160] And, the dry contact interface 64 is also connected to the output interface of the BMS module in the battery cabinet;

[0161] Specifically, there are 2-pin dry contact definitions in the input interface of the BMS module, which are matched and installed to the "input interface" through external 2-way dry contacts. The leads in the power management module directly reach the battery management unit 5 to read the dry contact signal, so that the software of the battery management unit 5 can make corresponding judgments. By externally loading a display screen device, the status can be displayed on it, and the early warning or alarm function can be realized.

[0162] Also included is a boost module;

[0163] The boost module is connected between the battery management unit 5 and the display interface 63;

[0164] The boost module receives the 12V voltage output by the battery management unit 5 and boosts it to 24V and outputs it to the display screen interface 63 to power the display screen and other 24V devices.

[0165] In addition, a diagnostic interface is included for reading diagnostic data output by the power management device A1.

[0166] It also includes auxiliary interfaces for providing corresponding signals, power supply input and output, etc.

[0167] In one embodiment, the first negative electrode copper bar 41 includes a copper bar first portion 411 and a copper bar second portion 412;

[0168] The first portion 411 of the copper busbar is shovel-shaped when viewed from above;

[0169] The narrow end of the first portion 411 of the copper busbar is connected to the negative input terminal 18;

[0170] The housing partition 19 is provided with a current sensor bracket at a position corresponding to the narrow end;

[0171] A current sensor 7 is arranged above the current sensor bracket;

[0172] The current sensor 7 is in a ring shape, and the narrow end passes through the current sensor 7;

[0173] The current sensor 7 is electrically connected to the battery management unit 5 .

[0174] Specifically, in order to achieve a better current detection effect, in this embodiment, a current sensor 7 is provided on the first negative electrode copper plate 41 .

[0175] Specifically, the current sensor 7 includes a ring-shaped closed conductor structure for capturing the induced magnetic field on the line, and then calculating the current intensity on the line. In order to improve the measurement accuracy of the current sensor 7, the copper bar first part 411 of the first negative copper bar 41 is set to be shovel-shaped, which is narrowed to form a narrow end at the part passing through the current sensor 7 and passes through the ring-shaped part of the current sensor 7.

[0176] The current sensor 7 is connected to the battery management unit 5 through a signal harness, so that the battery management unit 5 senses the current intensity and counts.

[0177] The housing partition 19 is provided with a copper bar auxiliary bracket at a position corresponding to the wide end of the first portion 411 of the copper bar;

[0178] The wide end is fixed on the copper bar auxiliary bracket;

[0179] The housing partition 19 is provided with a relay 8 on one side of the copper bar auxiliary bracket close to the front panel;

[0180] The first end of the relay 8 is arranged upward and connected to the wide end;

[0181] The second end of the relay 8 is arranged upward and connected to the second portion 412 of the copper busbar;

[0182] The first end of the copper bar second portion 412 is fixed on the copper bar auxiliary bracket;

[0183] The second end of the second copper busbar portion 412 is connected to the battery pack switch 9;

[0184] The control end of the relay 8 is connected to the battery management unit 5 .

[0185] Specifically, in order to achieve a better line cutting effect, in this embodiment, the first negative copper bar 41 is split into a mutually separated copper bar first part 411 and a copper bar second part 412. The narrow end of the copper bar first part 411 is connected to the negative input terminal 18, the second end of the copper bar second part 412 is connected to the battery pack switch 9, and the other ends of the copper bar first part 411 and the copper bar second part 412 are respectively fixed on the upper surface of the copper bar auxiliary bracket.

[0186] The first copper bar portion 311 and the second copper bar portion 312 are respectively connected to the two contacts of the relay 8 facing upward, thereby forming an electrical connection. The control end of the relay 8 is connected to the battery management unit 5. Normally, the relay 8 is in a normally closed state and is disconnected by the battery management unit 5 as needed, thereby achieving remote disconnection without operating the battery pack switch 9.

[0187] A rectifier is provided in the relay, the rectifier is connected in parallel to both ends of the positive electrode of the relay, and the rectifier is controlled by the battery management unit;

[0188] The battery management unit performs a preliminary check on the rectifier and then controls the relay to close to allow charging of the battery pack.

[0189] In addition, it also supports the function of the battery pack to discharge to the external load autonomously without any control, ensuring that the user can unconditionally request power from the battery pack when the main switch is closed.

[0190] In one embodiment, the neutral line input terminal 12 is aligned with the neutral end of the power system output terminal 13 in the vertical direction;

[0191] The housing partition 19 is provided with a neutral wire avoidance opening at a position corresponding to the neutral wire copper bar 2;

[0192] The neutral copper bar 2 is vertically arranged between the neutral input terminal 12 and the power system output terminal 13 .

[0193] Specifically, in order to achieve a shorter output path, for the neutral line output that does not need to be controlled by a switch, in this embodiment, the positions of the neutral line input terminal 12 and the power system output terminal 13 on the front panel are adjusted so that the neutral line input terminal 12 and the neutral end of the power system output terminal 13 are aligned in the vertical direction.

[0194] Then, inside the housing 1, a long, short neutral copper bar 2 can be provided to connect between the neutral input terminal 12 and the power system output terminal 13 for output.

[0195] In one embodiment, the positive electrode copper bar 3 further includes a third positive electrode copper bar 33;

[0196] The positive input terminal of the battery pack switch 9 includes a first positive input terminal and a second positive input terminal;

[0197] The positive output terminal of the battery pack switch 9 includes a first positive output terminal and a second positive output terminal;

[0198] The first positive input terminal and the first positive output terminal, and the second positive input terminal and the second positive output terminal are arranged in pairs;

[0199] The first positive copper busbar 31 is connected to the first positive input terminal;

[0200] A first end of the third positive copper busbar 33 is connected to the first positive output end;

[0201] The second end of the third positive copper bar 33 is wound from the back of the battery switch 9 to the top of the battery switch 9 to connect to the second positive input terminal;

[0202] The second positive electrode copper busbar 32 is connected to the second positive electrode output terminal.

[0203] Specifically, in order to achieve a better cutting effect on the high-voltage positive electrode, in this embodiment, the input channel of the battery pack switch 9 is adjusted, three input channels are set, and the channels on the positive electrode side are set to two.

[0204] Among them, when the first positive copper busbar 31 is connected to the first positive input terminal, its corresponding first output terminal is not connected to the second positive copper busbar 32, but to the third positive copper busbar 33. The third positive copper busbar 33 goes back to the top of the battery pack switch 9 and is reconnected to the second positive input terminal. The battery pack switch 9 is used to cut off the control again, and then the output is controlled by the second positive output terminal below.

[0205] 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.

[0206] 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 power management system module, characterized in that: The power management system module is arranged in the battery cabinet; The power management system module includes a housing; A neutral line input terminal is provided at an upper portion of the outer side of the front panel of the housing; The lower portion of the outer side of the front panel is provided with a power system output terminal; A neutral copper bar is arranged in the housing; The neutral line input end passes through the front panel and is connected to the neutral line copper busbar; The other end of the neutral copper bar is connected to the neutral end of the output end of the power supply system; The neutral line input end is connected to a positive and a negative of two half-cycle groups of the battery group in the battery cabinet as a neutral point.

2. The power management system module according to claim 1, characterized in that: The housing also includes: a positive copper bar, a negative copper bar and a battery pack switch; The battery pack switch performs high voltage cutoff under overload conditions; The battery pack switch is fixed to the middle part of the inner side of the front panel; The upper portion of the outer side of the front panel is also provided with a positive input terminal and a negative input terminal respectively; The positive copper bar comprises a first positive copper bar and a second positive copper bar; The positive electrode input terminal passes through the front panel and is connected to the first end of the first positive electrode copper busbar; The second end of the first positive copper busbar is connected to the positive input end of the battery pack switch; The first end of the second positive copper bar is connected to the positive output end of the battery pack switch; The output end of the power system passes through the front panel, and the second end of the second positive copper bar is connected to the positive end of the output end of the power system; The negative electrode copper bar comprises a first negative electrode copper bar and a second negative electrode copper bar; The negative electrode input terminal passes through the front panel and is connected to the first end of the first negative electrode copper busbar; The second end of the first negative copper bar is connected to the negative input end of the battery pack switch; The first end of the second negative copper bar is connected to the negative output end of the battery pack switch; The output end of the power system passes through the front panel, and the second end of the second negative copper busbar is connected to the negative end of the output end of the power system.

3. The power management system module according to claim 2, characterized in that: The housing includes a housing partition; The shell partition is arranged in the shell in a horizontal direction; The housing partition is provided with a battery switch notch at a position close to the battery switch; The positive input terminal and the negative input terminal of the battery pack switch are located above the battery pack switch; The first positive copper bar and the first negative copper bar are located above the housing separator; The positive output terminal and the negative output terminal of the battery pack switch are located below the housing partition; The second positive copper bar and the second negative copper bar are located below the housing partition.

4. The power management system module according to claim 3, characterized in that: The housing partition is provided with a wiring harness notch on a side away from the battery pack switch; The wiring harness notch is a rounded rectangular hole; The rounded rectangular hole is provided with a circuit board bracket on the long side near the battery pack switch; The circuit board bracket extends downward from the housing partition; The circuit board bracket is provided with a battery management unit on a side away from the battery pack switch; The wiring harness interface of the battery management unit is arranged upwardly toward the circular rectangular hole; A plurality of external interfaces are respectively arranged above the back panel of the housing and on the front panel; The wiring harness interfaces are connected to the external interfaces respectively.

5. The power management system module according to claim 4, characterized in that: The external interface includes: A CAN bus interface, the CAN bus interface is connected to each of the battery packs and collects battery diagnostic information of the battery packs; An Ethernet interface, the Ethernet interface being connected to an external Ethernet device; A display screen interface, the display screen interface is connected to the display screen of the battery cabinet and outputs battery display information; A dry contact interface, the dry contact interface being connected to an output interface of a BMS module in the battery cabinet; The BMS module reads the dry contact signal through the dry contact interface.

6. The power management system module according to claim 4, characterized in that: The first negative electrode copper bar comprises a copper bar first part and a copper bar second part; The first portion of the copper busbar is shovel-shaped when viewed from above; The narrow end of the first part of the copper busbar is connected to the negative input terminal; The housing partition is provided with a current sensor bracket at a position corresponding to the narrow end; A current sensor is arranged above the current sensor bracket; The current sensor is in a ring shape, and the narrow end passes through the current sensor; The current sensor is electrically connected to the battery management unit; The current sensor samples the current on the first negative copper bus to form a current sampling signal which is input into the battery management unit; The housing partition is provided with a copper bar auxiliary bracket at a position corresponding to the wide end of the first portion of the copper bar; The wide end is fixed on the copper bar auxiliary bracket; The housing partition is provided with a relay on one side of the copper bar auxiliary bracket close to the front panel; The first end of the relay is arranged upward and connected to the wide end; The second end of the relay is arranged upward and connected to the second part of the copper busbar; The first end of the second part of the copper bar is fixed to the copper bar auxiliary bracket; The second end of the second part of the copper busbar is connected to the battery pack switch; The control end of the relay is connected to the battery management unit; The relay is provided with a rectifier, the rectifier is connected in parallel to both ends of the positive electrode of the relay, and the rectifier is controlled by the battery management unit; The battery management unit controls the relay to close to charge the battery pack after pre-checking the rectifier.

7. The power management system module according to claim 3, characterized in that: The neutral line input end is aligned with the neutral end of the power system output end in the vertical direction; The housing partition is provided with a neutral line avoidance opening at a position corresponding to the neutral line copper bar; The neutral copper bar is vertically arranged between the neutral input end and the power system output end.

8. The power management system module according to claim 3, characterized in that: The positive copper bar also includes a third positive copper bar; The positive input terminal of the battery pack switch includes a first positive input terminal and a second positive input terminal; The positive output terminal of the battery pack switch includes a first positive output terminal and a second positive output terminal; The first positive input terminal and the first positive output terminal, and the second positive input terminal and the second positive output terminal are arranged in pairs; The first positive electrode copper busbar is connected to the first positive electrode input terminal; The first end of the third positive copper busbar is connected to the first positive output end; The second end of the third positive copper bar is passed from the back of the battery pack switch to the top of the battery pack switch to connect to the second positive input end; The second positive electrode copper busbar is connected to the second positive electrode output terminal.

9. The power management system module according to claim 5, characterized in that: Also includes a boost module; The boost module is connected between the battery management unit and the display interface; The boost module receives the 12V voltage output by the battery management unit and boosts it to 24V and outputs it to the display screen interface for power supply.

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