Battery detection energy storage system

Abstract

The utility model discloses a battery detection energy storage system, which comprises a battery production line formation equipment system, a battery production line charging equipment system, a battery production line capacity grading equipment system and an energy feedback type micro-grid energy storage system, the energy feedback type micro-grid energy storage system comprises a charging device, a confluence conversion device, an energy storage device, an energy conversion device and an energy control device. According to the utility model, on the basis of the existing power supply architecture, the direct-current connecting busbar among formation, capacity grading and charging equipment is led out and connected to each channel of the energy feedback type micro-grid energy storage system, the direct-current micro-grid energy storage system is directly connected with the cell test system, and a DC power supply is connected during charging, so that the direct-current micro-grid energy storage system can be connected with the cell test system; discharging feedback is fed back to the direct-current micro-grid energy storage system, and multi-stage energy conversion does not exist; therefore, the system has the advantages of improving energy recovery efficiency, improving power supply reliability, saving electric charge, thoroughly solving the problem of power grid harmonic waves of enterprises and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy battery detection, in particular to a battery detection energy storage system. Background Art

[0002] The main production process of lithium iron phosphate batteries is as follows: stirring (slurrying) - coating - rolling - slitting / slicing / die cutting - baking - winding / laminating - encapsulating / welding - injecting electrolyte - forming / grading / testing - packaging and warehousing, etc. Forming / grading / testing means steps such as charging for forming, grading, and testing.

[0003] Charging and forming process: After the battery is assembled, it is initially charged under certain conditions to activate the active substances on the battery electrodes. At the same time, a dense SEI film is formed on the anode surface to protect the entire chemical interface.

[0004] Grading process: After a batch of lithium batteries are produced, although they have the same size, there will be differences in the battery capacity. Therefore, they must be fully charged according to the specifications on the equipment and then discharged according to the specified current (fully discharged). The time taken to fully discharge multiplied by the discharge current is the battery capacity. Only when the tested capacity meets or exceeds the designed capacity is the battery qualified, and a battery with a capacity less than the designed capacity is not a qualified battery. The process of screening qualified batteries through capacity testing is called grading.

[0005] In the existing battery cell production line, energy recovery is achieved through multiple AC-DC conversions and step-up / step-down transformations, resulting in relatively large line losses. The theoretical calculation of the energy recovery efficiency is only about 60 - 70%, and the actual efficiency is even lower (some manufacturers report that the actual efficiency is only 40 - 50%). The low recovery efficiency causes a large amount of electrical energy loss and waste for enterprises. In addition, in the charging, forming, and grading test processes of the existing battery production line, a large number of forming machines and capacity machines are used. The front-end rectifier circuit of such equipment usually adopts a thyristor phase-controlled rectifier circuit, including three-phase full-bridge 6-pulse and six-phase full-bridge 12-pulse rectifier circuits, etc. Harmonic interference will be generated during the power conversion. The harmonic content generated by equipment from different manufacturers is different, but generally it is relatively high, directly affecting the power quality in the workshop. Content of the Utility Model

[0006] The purpose of the utility model is to solve the deficiencies existing in the prior art and to propose a battery detection energy storage system.

[0007] To achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A battery detection energy storage system includes a battery production line forming equipment system, a battery production line charging equipment system, and a battery production line grading equipment system. It is characterized in that it further includes an energy feedback type microgrid energy storage system, and the energy feedback type microgrid energy storage system includes the following equipment:

[0009] A charging device, including a transformer and a current converter, is connected to the mains power grid through the transformer and provides available voltage, current, and power for use through the current converter.

[0010] A bus conversion device shunts and conveys the electricity obtained by the charging device to an energy storage device.

[0011] An energy storage device, including multiple battery clusters, is used to provide a stable power supply for battery processing and detection.

[0012] An energy conversion device is connected to the bus conversion device at one end and is successively connected to a battery production line formation equipment system, a battery production line charging equipment system, and a battery production line grading equipment system at the other end.

[0013] An energy control device controls the opening and closing of the charging device, the bus conversion device, the energy storage device, and the energy conversion device through signal lines and monitors the operating state.

[0014] Preferably, a reverse current detection device is further provided between the charging device and the mains power grid to improve the safety performance of the system.

[0015] Connection method of the energy feedback type microgrid energy storage system: Power cabinets are respectively provided at the access ends of the battery production line formation equipment system, the battery production line charging equipment system, and the battery production line grading equipment system. A main busbar is arranged in each power cabinet and is connected to an AC / DC module (AC-DC converter) through the main busbar. The AC / DC module is connected to a busbar, and the busbar is connected to a battery under test through a DC / DC module (DC converter).

[0016] That is, the cabinets of each system for formation / grading / detection are separately arranged, and the energy conversion device is respectively connected to the busbars of the battery production line formation equipment system, the battery production line charging equipment system, and the battery production line grading equipment system through switches, and is used to control the power exchange between each system for formation / grading / detection and the workshop power grid and the energy storage device during charging and discharging.

[0017] In the present utility model, on the existing power supply architecture, the DC connection busbars in the middle of the formation, grading, and charging equipment are led out and connected to each channel of the energy feedback type microgrid energy storage system. The DC microgrid energy storage system is directly connected to the cell test system. When charging, a DC power supply is connected, and when discharging and feeding back, it is fed back to the DC microgrid energy storage system, and there is no multi-stage energy conversion.

[0018] Preferably, when the battery under test is charged during the formation stage or the charging stage, the battery production line formation equipment system and the battery production line charging equipment system are connected to the energy storage device through the energy conversion device to directly provide the power supply for testing.

[0019] Preferably, when the battery under test discharges during the grading process, the output feedback energy is connected to the energy storage device through the energy conversion device; during charging, the energy is recharged from the energy storage device into the battery under test in the battery production line grading equipment system, or provides energy for the battery under test during the formation and charging processes.

[0020] As an extended technical solution, the battery under test is arranged on a conveyor belt, and the battery under test is sequentially connected to the DC / DC modules of the battery production line formation equipment system, the battery production line charging equipment system, and the battery production line grading equipment system, thereby constructing a test pipeline for sequentially performing formation, charging, and grading on the battery under test.

[0021] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0022] 1. Improve energy recovery efficiency: In the original energy recovery of the battery cell test system, through multi-stage energy conversion, the overall energy recovery efficiency is only 45%; while the microgrid energy storage system with energy feedback is directly connected to the battery cell test system, optimizing the overall connection method, and the overall efficiency can be increased to 90%.

[0023] 2. Improve power supply reliability: The energy-fed microgrid energy storage system and the power supply of the existing battery cell test system are backup to each other. The dual-power form improves the power supply reliability of the system. When one party fails, it can be quickly switched to the other system to ensure production.

[0024] 3. Save electricity costs: The energy-fed microgrid energy storage system is connected to the main grid of the park grid, which can supplement the power consumed by the battery cell test system at night. By utilizing the price advantage of the grid electricity price for peak shaving and valley filling, economic benefits can be obtained and electricity costs can be saved.

[0025] 4. Completely solve the enterprise grid harmonic problem: During the overall operation process of the energy feedback microgrid energy storage system, an independent DC microgrid system is formed, and it can even operate completely independently from the workshop grid. There will be no frequent AC-DC conversion, and the grid harmonic problem can be completely solved. Description of the Drawings

[0026] Figure 1 It is the system topology diagram of a battery detection energy storage system proposed by the present utility model;

[0027] Figure 2 It is the charging and formation process topology diagram of the battery under test used in the present utility model;

[0028] Figure 3 It is the grading process topology diagram of the battery under test used in the present utility model;

[0029] Figure 4 It is the left part of the circuit connection structure schematic diagram of a battery detection energy storage system proposed by the present utility model;

[0030] Figure 5 This is the right part of the schematic diagram of the circuit connection structure of a battery detection energy storage system proposed by the present utility model. Specific embodiments

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0032] First, briefly introduce the battery production line formation equipment system, the battery production line charging equipment system, and the battery production line grading equipment system:

[0033] 1) Charging and formation process:

[0034] The topological diagram of the charging and formation process is as Figure 2 shown. The AC / DC module (AC-DC converter) is connected through the main busbar, and the AC / DC module is connected to the busbar. The busbar is connected to the battery under test through the DC / DC module (DC converter).

[0035] 2) Grading process:

[0036] The topological diagram of the grading process is as Figure 3 shown. When charging, the commercial power is converted into high-voltage direct current by the ACDC module and enters the DCDC module. The DCDC module converts the high-voltage direct current into the low-voltage direct current required by the battery to charge the battery in the corresponding storage location; when discharging, the battery power is converted into direct current by the DCDC module to the high-voltage DC busbar, and the busbar charges the battery in the adjacent storage location or is converted into alternating current by the ACDC module and enters the workshop power grid to charge the batteries in other columns. Embodiment 1

[0037] Referring to Figures 1-4 , a battery detection energy storage system includes a battery production line formation equipment system, a battery production line charging equipment system, and a battery production line grading equipment system, and further includes an energy feedback type microgrid energy storage system. The energy feedback type microgrid energy storage system includes the following equipment:

[0038] A charging device, including a transformer and an inverter, is connected to the commercial power grid through the transformer and provides electricity with available voltage, current, and power through the inverter;

[0039] A busbar conversion device that shunts and transports the electricity obtained by the charging device to the energy storage device;

[0040] An energy storage device, including multiple battery clusters, is used to provide a stable power supply for battery processing and detection;

[0041] An energy conversion device, one end of which is connected to a bus conversion device, and the other end is successively connected to a formation equipment system of a battery production line, a charging equipment system of a battery production line, and a grading equipment system of a battery production line;

[0042] An energy control device controls the opening and closing of a charging device, a bus conversion device, an energy storage device, and an energy conversion device through signal lines and monitors the operating status.

[0043] Among them, a reverse current detection device is also provided between the charging device and the mains power grid to improve the safety performance of the system.

[0044] The connection mode of the energy feedback type microgrid energy storage system is as follows: power cabinets are respectively provided at the access ends of the formation equipment system of a battery production line, the charging equipment system of a battery production line, and the grading equipment system of a battery production line. A main bus bar is arranged in each power cabinet and is connected to an AC / DC module (AC-DC converter) through the main bus bar. The AC / DC module is connected to a bus bar, and the bus bar is connected to a to-be-tested battery through a DC / DC module (DC converter).

[0045] That is, the sub-cabinets of each system for formation / grading / detection are set, and the energy conversion device is respectively connected to the bus bars of the formation equipment system of a battery production line, the charging equipment system of a battery production line, and the grading equipment system of a battery production line through switches, and is used to control the power exchange between each system for formation / grading / detection and the workshop power grid and the energy storage device during charge and discharge.

[0046] On the existing power supply architecture, the DC connection bus bars between the formation, grading, and charging equipment are led out and connected to each channel of the energy feedback type microgrid energy storage system. The DC microgrid energy storage system is directly connected to the cell test system. When charging, the connected power source is a DC power supply, and when discharging and feeding back, it is fed back to the DC microgrid energy storage system, and there is no multi-stage energy conversion.

[0047] When the to-be-tested battery is charged during the formation stage or the charging stage, the formation equipment system of a battery production line and the charging equipment system of a battery production line are connected to the energy storage device through the energy conversion device to directly provide the power supply for testing.

[0048] When the to-be-tested battery discharges during the grading stage, the output and feedback energy is connected to the energy storage device through the energy conversion device; when charging, the energy is charged from the energy storage device into the to-be-tested battery of the grading equipment system of a battery production line again, or provides energy for the to-be-tested battery during the formation stage and the charging stage. Embodiment 2

[0049] On the basis of Embodiment 1, as an extended technical solution, the battery to be tested is arranged on a conveyor belt, and the battery to be tested is sequentially connected to the DC / DC modules of the formation equipment system, the charging equipment system, and the grading equipment system of the battery production line, so as to construct a test pipeline for sequentially performing formation, charging, and grading on the battery to be tested.

[0050] As described above, the above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A battery detection and energy storage system, comprising a battery production line formation equipment system, a battery production line charging equipment system and a battery production line capacity separation equipment system, characterized in that: It also includes an energy feedback microgrid energy storage system, which includes the following equipment: A charging device, including a transformer and a converter, is connected to the mains power grid through the transformer and provides electricity with usable voltage, current and power through the converter; A current converging and converting device for transferring the electricity obtained by the charging device to the energy storage device; Energy storage devices, including multiple battery clusters, are used to provide a stable power source for battery processing and testing; An energy conversion device, one end of which is connected to the converging conversion device, and the other end of which is sequentially connected to the battery production line formation equipment system, the battery production line charging equipment system and the battery production line capacity division equipment system; The energy control device controls the opening and closing of the charging device, the current conversion device, the energy storage device and the energy conversion device through the signal line, and monitors the operating status.

2. A battery detection energy storage system according to claim 1, characterized in that: A reverse current detection device is also provided between the charging device and the mains power grid to improve the safety performance of the system.

3. A battery detection energy storage system according to claim 1, characterized in that: The access ends of the battery production line formation equipment system, the battery production line charging equipment system and the battery production line capacity division equipment system are respectively provided with power cabinets, each power cabinet is provided with a main bus, the AC / DC module is connected through the main bus, the AC / DC module is connected to the bus bar, and the bus bar is connected to the battery to be tested through the DC / DC module.

4. A battery detection energy storage system according to claim 3, characterized in that: The energy conversion device is connected to the busbars of the battery production line formation equipment system, the battery production line charging equipment system and the battery production line capacity division equipment system through switches, and is used to control the formation / capacity division / detection systems to exchange electricity with the workshop power grid and the energy storage device during charging and discharging.

5. A battery detection energy storage system according to claim 3, characterized in that: When the battery to be tested is charged in the formation stage or the charging stage, the battery production line formation equipment system and the battery production line charging equipment system are connected to the energy storage device through the energy conversion device to directly provide power for the test.

6. A battery detection energy storage system according to claim 3, characterized in that: When the battery to be tested is discharged in the capacity division stage, the output feedback energy is connected to the energy storage device through the energy conversion device; when charging, the energy is then charged from the energy storage device into the battery to be tested in the battery production line capacity division equipment system, or provides energy for the battery to be tested in the formation stage and the charging stage.

7. A battery detection energy storage system according to claim 3, characterized in that: The battery to be tested is arranged on a conveyor belt, and the battery to be tested is sequentially connected to the DC / DC modules of the battery production line formation equipment system, the battery production line charging equipment system and the battery production line capacity division equipment system, thereby constructing a test line for sequentially forming, charging and capacity division of the battery to be tested.

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