External new energy battery equalization device

Abstract

The utility model relates to the technical field of new energy batteries, in particular to an external new energy battery equalization device, which comprises a bottom box, a cover plate, an equalization control module, a DC power supply, a power supply mounting plate, a communication line connector, an equalization line connector, a power socket and a power switch, the bottom of the bottom box is provided with a pressing rivet stud for fixing the balance control module, the side surface of the bottom box is provided with a communication line connector mounting hole, a balance line connector mounting hole, a power socket mounting hole, a power switch mounting hole, a grounding stud, a counterbore for mounting the power supply mounting plate and a threaded hole for mounting the cover plate, and the front surface of the power supply mounting plate is provided with a DC power supply mounting hole. A threaded hole connected with the bottom box and a counterbore connected with the bottom box are formed in the side surface of the bottom box; the problems that the batteries are unbalanced, and the actual charge-discharge capacity and the energy utilization efficiency are greatly reduced in the whole life cycle of the batteries are solved.

Description

Technical Field

[0001] The utility model relates to a battery balancing device, in particular to an external new energy battery balancing device, belonging to the technical field of battery protection. Background Art

[0002] Multiple cells are connected in series to form a group, which can be widely used in multiple industries such as new energy storage and new energy vehicles according to different voltage usage scenario requirements. During the use of batteries in series, there are often certain differences in the capacity of each cell when it leaves the factory. Limited by the "barrel effect", the maximum discharge capacity of the entire series battery system depends on the capacity of the smallest cell in the system. However, due to differences in the self-discharge rate, internal resistance, working environment temperature, and series circuit board welding process of each cell in the system, the cell SOC working range will gradually differentiate, resulting in an imbalance problem in which the maximum capacity of the system cannot be fully utilized. And as time accumulates, this imbalance problem will gradually worsen, and the actual charge and discharge capacity and energy utilization efficiency will be greatly reduced during the entire life cycle of the battery.

[0003] In order to effectively solve this problem, the battery system needs to be balanced to reduce the discreteness of the SOC working range of each battery cell. The traditional balancing algorithm controls the opening or closing of balancing by setting a fixed voltage difference threshold. During the charging and discharging process, if the deviation between the battery cell and the average voltage or the minimum voltage is greater than a certain threshold, the balancing is turned on for the battery cell. When the deviation between the two is less than the end threshold, the balancing is stopped. On the one hand, this algorithm cannot accurately locate the minimum capacity battery cell to maximize its capacity; on the other hand, it cannot accurately control the balancing time. If a battery cell has a leakage problem and causes the voltage to continue to drop, most batteries will start balancing. If the battery system has not been working for a long time, the entire system will eventually lose power. Summary of the invention

[0004] The purpose of the utility model is to provide an external new energy battery balancing device to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] An external new energy battery balancing device comprises a bottom box, a cover plate, a balancing control module, a DC power supply, a power supply mounting plate, a communication line connector, a balancing line connector, a power socket, and a power switch; a riveted stud for fixing the balancing control module is arranged at the bottom of the bottom box, and a communication line connector mounting hole, a balancing line connector mounting hole, a power socket mounting hole, a power switch mounting hole, a grounding stud, a countersunk hole for installing the power supply mounting plate, and a threaded hole for installing the cover plate are arranged on the side thereof; a DC power supply mounting hole is arranged on the front of the power supply mounting plate, and a threaded hole connected to the bottom box is arranged on the side thereof; and a countersunk hole connected to the bottom box is arranged on the side of the cover plate 5.

[0007] As a preference, the side of the cover plate is also provided with a mounting hole for fixing the entire device.

[0008] As a preferred embodiment, the side and front sides of the cover plate are provided with heat dissipation ventilation holes.

[0009] As a preferred embodiment, insulating highland barley paper is bonded to the inner side of the bottom surface of the bottom box.

[0010] As a preferred embodiment, bridge-type binding wires are distributed around the inner wall of the base box.

[0011] As another preferred embodiment, filter mesh cotton is bonded to the inner side of the heat dissipation ventilation hole.

[0012] Beneficial effects of the present invention:

[0013] 1. The reinforcement of the battery equalization device is made of aluminum plate, which has high compressive strength, is not easy to be damaged, and has good corrosion resistance. It is not easy to be affected by moisture, mold or rust. These characteristics enable the aluminum plate to maintain its beauty and performance in long-term use. It is also relatively light in weight and can be easily carried. The surface is not easy to adhere to pollutants and has good cleanliness.

[0014] 2. The battery balancing device and wiring harness all use connectors, which simplify the assembly process of electronic products and the mass production process. If an electronic component fails, the failed component can be quickly replaced when the connector is installed.

[0015] 3. The battery balancing device uses an external power supply to charge the battery string. It is an active balancing device that can greatly reduce the heating problem caused by the resistance shunt in the passive balancing circuit and improve the energy utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a schematic diagram of the exploded portion of the external new energy battery balancing device of the utility model.

[0018] Figure 2 It is a schematic diagram of the three-dimensional structure of the balancing device in the utility model.

[0019] Figure 3 It is a bottom view structural diagram of the battery equalization device in the utility model.

[0020] Figure 4It is a front view structural schematic diagram of the battery equalization device in the utility model.

[0021] Figure 5 The figure is an electrical schematic diagram of the battery equalization device in the utility model.

[0022] 1. In the figure: 1- base box, 2- balancing control module, 3- power supply mounting plate, 4- DC power supply, 5- cover plate, 6- power switch, 7- power socket, 8- balancing line connector, 9- communication line connector, 10- power harness, 11- communication harness, 12- balancing harness, 13- external main control module, 14- battery cluster. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings.

[0024] Embodiment 1

[0025] like Figure 1-5 As shown, an external new energy battery balancing device includes a bottom box 1, a cover plate 5, a balancing control module 2, a DC power supply 4, a power supply mounting plate 3, a communication line connector 9, a balancing line connector 8, a power socket 7, and a power switch 6; the bottom of the bottom box 1 is provided with a riveted stud for fixing the balancing control module, and its side has a communication line connector mounting hole, a balancing line connector mounting hole, a power socket mounting hole, a power switch mounting hole, a grounding stud, a countersunk hole for installing the power mounting plate, and a threaded hole for installing the cover plate, the front of the power supply mounting plate 3 has a DC power supply 4 mounting hole, the side of the cover plate 5 has a threaded hole connected to the bottom box, and the side has a countersunk hole connected to the bottom box 1.

[0026] The side of the cover plate 5 is also provided with mounting holes for fixing the entire device, so as to facilitate the rapid fixing or disassembly of the equalizer box.

[0027] The cover plate 5 has heat dissipation ventilation holes on the sides and the front, which can significantly improve the heat dissipation efficiency of the battery equalizer box, thereby creating a more stable performance output environment.

[0028] Insulating barley paper is bonded to the inner side of the bottom surface of the bottom box to provide insulation protection for the equalizer control module.

[0029] The inner wall of the bottom box 1 is surrounded by bridge-shaped binding wires, which can make the electrical wiring more neat and beautiful, and help to improve the overall effect of the battery equalizer box.

[0030] The inner side of the heat dissipation and ventilation holes is bonded with filter cotton to prevent mosquitoes from entering and damaging the device.

[0031] The balancing wire connector facilitates installation, disassembly and maintenance of the balancing wire harness 12 .

[0032] The communication line connector facilitates the installation, disassembly and maintenance of the communication wiring harness 11.

[0033] The power socket facilitates installation, disassembly and maintenance of the external power supply line 10.

[0034] The power switch can turn on or off the power of the device, so that the device is in working state or closed state. In an emergency or maintenance, the power can be quickly cut off to ensure the safety of personnel and equipment.

[0035] The balancing control module 2 is fixed to the bottom box 1 with screws, the DC power supply 4 is installed on the power supply mounting plate 3, and then the installed power supply and the power supply mounting plate are assembled to the bottom box 1, and the power switch 6, the power socket 7, the balancing line connector 8, and the communication line connector 9 are installed to the bottom box 1 respectively, and all internal wiring is completed. Finally, the cover plate 5 is sealed to the bottom box 1.

[0036] Figure 4 is a structural block diagram of a battery balancing device in an embodiment, refer to Figure 4 , the communication line connector 9 is connected to the balancing control module 2 .

[0037] In this solution, the balancing control module 2 can be connected to the upper control unit 13, such as the main control module in the battery management system (BMS), through the communication line connector 9 to perform predetermined communication interactions with the upper control unit, thereby achieving an intelligent balancing effect.

[0038] Working principle Figure 5 :It should be noted that the balancing device controls the relay switch inside the balancing control module 2 through the external main control module 13. Each string of batteries is connected to two relay switches. When the voltage of a string of batteries is too low, first, the two relay switches connected to this string of batteries are opened at the same time, the circuit is turned on, and the external 220 power supply can provide the DC power required for charging the battery through DC power conversion, thereby charging the battery. When the voltage of this string of batteries is higher than the average voltage of the entire cluster, the two relay switches connected to this string of batteries will be closed at the same time, ending the charging of this string of batteries. The external main control module continues to look for the string with the lowest battery voltage and repeats the previous charging process. This cycle continues indefinitely, so that the average voltage between battery strings becomes smaller and smaller, and its capacity is maximized. The above process achieves the goal of balancing the battery system to reduce the discreteness of the SOC working range of each battery cell.

[0039] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art under the technical guidance of the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An external new energy battery balancing device, comprising a base box (1), a cover plate (5), a balancing control module (2), a DC power supply (4), a power supply mounting plate (3), a communication line connector (9), a balancing line connector (8), a power socket (7), and a power switch (6); characterized in that: The bottom of the base box (1) is provided with a riveted stud for fixing the balancing control module, and its side has a communication line connector mounting hole, a balancing line connector mounting hole, a power socket mounting hole, a power switch mounting hole, a grounding stud, a countersunk hole for mounting a power mounting plate, and a threaded hole for mounting a cover plate; the front of the power mounting plate (3) has a DC power supply (4) mounting hole, and its side has a threaded hole connected to the base box; the side of the cover plate (5) has a countersunk hole connected to the base box (1).

2. The external new energy battery balancing device according to claim 1, characterized in that: The side surface of the cover plate (5) is also provided with a mounting hole for fixing the entire device.

3. The external new energy battery balancing device according to claim 1, characterized in that: The side and front sides of the cover plate (5) are provided with heat dissipation ventilation holes.

4. The external new energy battery balancing device according to claim 1, characterized in that: Insulating highland barley paper is bonded to the inner side of the bottom surface of the bottom box.

5. The external new energy battery balancing device according to claim 1, characterized in that: Bridge-shaped binding wires are distributed around the inner wall of the bottom box (1).

6. The external new energy battery balancing device according to claim 3, characterized in that: The inner side of the heat dissipation ventilation hole is bonded with filter mesh cotton.

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