CN218996804U

CN218996804U - Manufacturing equipment of energy storage device

Info

Publication number: CN218996804U
Application number: CN202223278463.3U
Authority: CN
Inventors: 朱夏纯; 车玲娟; 闫坤; 常雅慧; 陈希雯; 孙伟; 王俊华
Original assignee: Gmcc Electronic Technology Wuxi Co ltd
Current assignee: Gmcc Electronic Technology Wuxi Co ltd
Priority date: 2022-12-07
Filing date: 2022-12-07
Publication date: 2023-05-09
Anticipated expiration: 2032-12-07

Abstract

The utility model discloses integrated manufacturing equipment based on an ETP battery structure, which comprises an inlet transition bin, a packaging bin and an outlet transition bin, wherein the packaging bin comprises a liquid injection region, a formation region and a packaging region, a cleaned bipolar battery soft package semi-finished product leaves the inlet transition bin from a first outlet of the inlet transition bin, sequentially enters the liquid injection region, the formation region and the packaging region of the packaging bin, a bipolar battery which is packaged in the packaging region leaves the packaging region, enters the outlet transition bin from a second inlet, and capacity detection equipment is arranged in the outlet transition bin and used for detecting the bipolar battery. The utility model designs a highly integrated liquid injection-formation-exhaust-packaging device, which is based on redesigning and combining a main flow liquid injection machine, low dew point environmental equipment, formation equipment, a clamp, a thermoplastic packaging machine and an electrical system at present, and integrally integrating and outputting an ETP bipolar battery soft package structure.

Description

Manufacturing equipment of energy storage device

Technical Field

The utility model belongs to the technical field of energy storage devices, and particularly relates to manufacturing equipment of an energy storage device.

Background

The lithium ion battery has the advantage of high energy density, so that the lithium ion battery is widely applied in modern life, but the current lithium ion battery still cannot meet the requirement of users for longer standby time, so that the development of energy storage device products with higher energy density becomes an urgent requirement in the industry.

At present, the battery pack basically adopts a grouping mode from a single battery to a module to a battery pack, the battery safety is ensured by a multi-level grouping mode, but the space utilization rate and the energy density of the battery pack are sacrificed, a plurality of energy storage units are connected in series through a current collector in the existing battery to form a battery energy storage system, namely a ETP (Electrode to pack) battery, so that the packaging weight and the packaging volume of the battery can be reduced, the specific energy and the specific power of the battery are improved, the battery performance is more stable, the internal resistance is lower, and the safety of the battery is also greatly improved.

The existing unipolar battery soft package packaging technology is complex, the turnover time is long, the process management and control risk is high, the application requirement of an ETP bipolar battery soft package system is difficult to meet, particularly the traditional unipolar battery soft package production process can not meet the formation exhaust packaging requirement of the bipolar battery system, and if a secondary sealing process is adopted, risks are brought to the ETP highly integrated system.

Disclosure of Invention

In order to solve the above problems, the present utility model proposes an energy storage device manufacturing apparatus for ETP batteries.

The technical solution for achieving the above purpose is as follows:

a manufacturing apparatus for an energy storage device, the manufacturing apparatus comprising an inlet transition bin, a packaging bin, and an outlet transition bin;

the inlet transition bin comprises a first inlet and a first outlet, and after the bipolar battery soft package semi-finished product is connected to the formation system through the metal lead-out electrode lug, the bipolar battery soft package semi-finished product enters the inlet transition bin area from the first inlet, the inlet transition bin is filled with protective gas, and the protective gas cleans the bipolar battery soft package semi-finished product;

the packaging bin comprises a liquid injection region, a formation region and a packaging region, and the cleaned bipolar battery soft package semi-finished product leaves the inlet transition bin from a first outlet of the inlet transition bin and sequentially enters the liquid injection region, the formation region and the packaging region of the packaging bin;

the outlet transition bin comprises a second inlet and a second outlet, the bipolar battery which is packaged in the packaging area leaves the packaging area, the bipolar battery enters the outlet transition bin from the second inlet, capacity detection equipment is arranged in the outlet transition bin, and the capacity detection equipment detects the bipolar battery.

Further, preferably, a liquid injection machine or an external connection independent liquid injection machine is integrally arranged in the liquid injection area, the liquid injection machine is provided with a liquid injection needle, and the liquid injection needle is combined with a liquid injection port of the bipolar battery soft package semi-finished product to perform quantitative liquid injection.

Further improved, preferably, the shielding gas in the inlet transition bin is argon, and the cleaning times of the argon on the bipolar battery soft package semi-finished product are three times.

Further improvement, the packaging bin is preferably sealed and connected with the dehumidifier, so that the packaging bin is in a low water-oxygen ratio state, and the water-oxygen ratio is less than or equal to 1 ppm.

In a further improvement, the formation region is preferably provided with an electrical interface for electrically connecting the injected bipolar battery soft package semi-finished product in the formation region with an external formation system, and the formation system activates positive and negative electrode active substances of the bipolar battery soft package semi-finished product.

Further, preferably, the soft package semi-finished product of the bipolar battery is fixed by a clamp at the front outer side of the soft package semi-finished product of the bipolar battery entering the inlet transition bin, two sides and the bottom surface of the soft package semi-finished product of the bipolar battery are packaged by thermoplastic, and the upper end of the soft package semi-finished product of the bipolar battery is in an open state.

In a further development, the bipolar battery soft pack semi-finished product is preferably led out of a tab through metal, and the tab is electrically connected with the external formation system through the electrical interface.

Further, preferably, the formation region is further provided with an exhaust device for exhausting gas generated during formation of the bipolar battery soft pack semi-finished product.

Further improved, preferably, a vacuumizing device and a clamp pressurizing device are arranged in the packaging area, and the vacuumizing device starts to work after the formed soft package semi-finished bipolar battery enters the packaging area.

Further, preferably, aluminum films are arranged on two sides of the soft package semi-finished product of the bipolar battery, the clamp is clamped on the aluminum films on two sides, and the clamp pressurizing device pressurizes the clamp to perform thermoplastic sealing on the soft package semi-finished product of the bipolar battery.

The utility model is oriented to the packaging problem of soft package injection and liquefaction of an ETP structure system, and compared with the traditional unipolar battery, the bipolar battery is formed by connecting positive and negative unipolar electrodes at two ends with a plurality of bipolar electrodes in series, so that a high-voltage electrochemical system can be realized. The ETP structure is based on bipolar batteries, and is directly packaged into a module system by electrode plates, so that the traditional single shell is reduced, the module assembly process is omitted, the energy density can be remarkably improved, the system cost is reduced, the advantages of lower internal resistance, system simplification and the like are brought.

Aiming at the soft package structure of the ETP bipolar battery, the utility model designs highly integrated equipment meeting the requirement of liquid injection, formation and encapsulation, and can ensure high-quality and high-efficiency output.

The utility model designs a highly integrated liquid injection-formation-exhaust-packaging device, which is based on redesigning and combining a main flow liquid injection machine, low dew point environmental equipment, formation equipment, a clamp, a thermoplastic packaging machine and an electrical system at present, and integrally integrating and outputting an ETP bipolar battery soft package structure. The special structure of the ETP bipolar battery soft package is firstly based, wherein each independent positive and negative electrode unit is led out and connected to a formation clamp, namely the ETP bipolar battery soft package is firstly fixed by the formation clamp and the connection of the independent positive and negative electrode units is ensured. And then the soft package structure of the ETP bipolar battery is kept in an open state in the process of entering an inlet transition bin for 3-4 times of cleaning by protective gas, and then quantitative liquid injection is carried out, and proper liquid injection rate and soaking time are selected. The chemical process is carried out after the infiltration is ensured to be completed, obvious gas production phenomenon occurs in the chemical process, the low dew point is maintained in the process, and the positive pressure gas is timely discharged for treatment. And after formation and exhaust are completed, the packaging process is carried out, and the soft package aluminum plastic film is subjected to thermoplastic packaging. The whole process is kept in a low dew point environment. And after packaging, entering an outlet transition bin for 3-4 times of cleaning with protective gas, and finally, obtaining the complete ETP bipolar battery soft package product.

Aiming at the problem of liquid injection-formation-encapsulation in the actual production process of the soft package structure of the ETP bipolar battery, the utility model designs highly integrated equipment which provides a low dew point environment and ensures high-efficiency and high-quality output. Effectively solves the following problems: (1) The problem that each independent positive and negative electrode unit in the ETP bipolar battery soft package is difficult to form comprises the problem that timely exhaust is needed after formation; (2) The traditional process needs secondary sealing, and the integrated equipment only needs primary packaging, so that the soft package semi-finished product of the ETP bipolar battery is in an open state in the early stage, and the convenience is greatly improved in the actual process; (3) The whole working procedure is carried out in a low dew point environment, and is controlled by an electrical system, so that the consistency of products is ensured, and high-quality and high-efficiency production is realized.

Drawings

Fig. 1 is a schematic diagram of a conventional battery cell structure.

Fig. 2 is a schematic view of the ETP bipolar battery of the present utility model.

FIG. 3 is a schematic view of a battery with a conductive polymer as a bipolar electrode.

FIG. 4 is a schematic view of a bipolar electrode metal cap structure.

Fig. 5 is a schematic diagram of a conventional battery soft pack liquid injection apparatus.

Fig. 6 is a schematic structural view of an ETP bipolar battery soft pack semi-finished product.

Fig. 7 is an integrated ETP bipolar battery manufacturing apparatus.

Detailed Description

The present utility model will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the conventional unit cell 10 includes a positive electrode current collector 11, a negative electrode current collector 13, and a separator 12, wherein the positive electrode current collector 11 is mostly aluminum foil, a positive electrode active material 15 is coated thereon, the negative electrode current collector 13 is mostly copper foil, and a negative electrode active material 14 is coated thereon; the current mainstream single battery structure is shown in fig. 1, wherein the lithium ion battery has the advantages of high specific energy, high voltage, small self-discharge, good cycle performance, long service life and the like, and is widely applied to power batteries and energy storage systems, and the single battery in the current power energy storage system mostly adopts cylindrical, square aluminum shells or soft package designs, and an independent battery shell is arranged outside each single battery. Based on the characteristics, the battery cells form a battery module and then are integrated to form a battery pack, and the power or energy storage system requirements are met through series-parallel connection of the cells and the module. The parts such as the lug, the connecting piece, the battery shell and the like of the connecting mode can increase the weight and the connecting impedance of the battery, reduce the power density and the energy density of the battery, and increase the potential safety hazard of the battery.

As shown in fig. 2, the bipolar battery structure comprises a plurality of electrode sheets, and is assembled into a battery cell 20 by an assembly mode of alternating lamination of the electrode sheets, a diaphragm and electrolyte, and the battery cell is externally covered with a shell. The two electrode plates at the outermost side are respectively coated with a positive electrode active material 22 and a negative electrode active material 23, an outer negative electrode piece 26, an outer positive electrode piece 21 and a battery cell serial group 150, wherein the two ends of the battery cell serial group 150 are respectively provided with a positive electrode end and a negative electrode end, the outer negative electrode piece 26 is connected with the negative electrode end, the outer positive electrode piece 21 is connected with the positive electrode end, the battery cell serial group comprises a plurality of bipolar electrode plates which are overlapped, a diaphragm 25 for blocking electrons from passing is arranged between every two adjacent bipolar electrode plates, and every two adjacent internal bipolar electrode plates 24 mutually form a power supply unit, and a plurality of power supply units are connected in series.

The bipolar electrode plates are closely attached to the separator, so that the occupied space of the bipolar electrode plates 24 is reduced, and the volume of the whole battery is reduced. Each bipolar electrode plate comprises an internal current collector, a positive electrode active material layer and a negative electrode active material layer, wherein the positive electrode active material layer and the negative electrode active material layer are respectively coated and arranged on the two side surfaces of the internal current collector, a diaphragm 25 is arranged between each positive electrode active material layer and the adjacent negative electrode active material layer, and the positive electrode active material layer and the negative electrode active material layer are respectively attached to the corresponding internal diaphragm 25, so that the volume of the whole battery cell is further reduced. The bipolar battery is a battery module formed by superposing and connecting a plurality of battery units in series through bipolar electrodes in the battery, and can reduce the packaging weight and the packaging volume of the battery, thereby improving the specific energy and the specific power of the battery, and having more stable battery performance and lower internal resistance.

In contrast, the bipolar battery has the following characteristics that (1) parts such as a tab, a connecting piece, a structural part, a battery shell and the like in the current battery pack do not exist, the ratio of active substances in a battery system is increased, and the specific power and specific energy of the battery system are improved; (2) The current direction is perpendicular to the electrode, the current passes through the very thin bipolar electrode, the current cross-section area is increased while the current transmission path is reduced, the current distribution in the battery is more uniform, the electron transfer channel is shortened, and the internal resistance of the battery is reduced; (3) If a certain battery unit in the bipolar battery is short-circuited, instant heavy current discharge of all battery units in the battery is not caused, only a small amount of heat is generated in the single battery, the battery can be used continuously, and the output voltage of the battery is reduced; (4) The bipolar power batteries are connected in parallel to form a group for use, so that the design of a battery pack management system can be simplified, and the cost of a power battery integrated system can be reduced. In addition, the parallel battery pack can realize rapid charge/discharge without requiring special requirements on electrode materials or electrode sheet coating thickness.

As shown in fig. 3, in this embodiment, a conductive polymer is used as the bipolar electrode, which has good flexibility and high conductivity, and meanwhile, the polymer is used as the current collector 24, so that the system quality can be further reduced, and the energy density can be improved. As shown in fig. 4, the bipolar current collector based on the polymer is metallized by adopting a vapor deposition process, and the metallized polymer current collector is connected with a battery management system through a weldable wire, so that electrochemical monitoring on electrode plate levels in the battery system is realized; in order to facilitate connection of each electrode to the power management system lead-out wires, each polymer current collector, after packaging, will be exposed to a portion at one end of the device, where it is metallized. The specific metalized part is the outer end of the bipolar current collector, and the metalized part forms a cap-like structure to wrap the end of the current collector. The utility model selects double-sided metallization and sets the end at the same time to form a cap-shaped structure, so as to ensure effective welding and increase the combination stability of metallization; the current collector is prepared by using vapor deposition as a means, a compact and stable metallization layer can be formed by vapor deposition, so that the cycling stability of a battery system is ensured, meanwhile, the battery system has excellent heat and electrical conductivity, various use environments are met, and the timely effectiveness of battery management is ensured.

As shown in fig. 5, in the current main stream soft package liquid injection procedure, a plurality of soft package clamps are adopted to enter a liquid injection environment box in groups, electrolyte is introduced through an outer pipeline to perform needle tube liquid injection, and the liquid injection technology is not applicable to an ETP bipolar soft package device, and has the problems of complex technology, long turnover time, difficult water-oxygen control and the like. As shown in fig. 6, the plastic-aluminum films 30 are disposed on two sides and bottom surfaces of the ETP bipolar battery core 20 prepared in fig. 4, the plastic-aluminum films 30 on two sides and bottom surfaces outside the ETP bipolar battery core 20 are subjected to thermoplastic packaging, the upper ends are in an open state, as shown in fig. 7, two sides of the soft package semi-finished product of the ETP bipolar battery, which is subjected to thermoplastic packaging on two sides and bottom surfaces, are clamped by a clamp, enter the inlet transition bin 41 from a first inlet of an inlet transition bin 41 of an integrated manufacturing device, the inlet transition bin 41 is filled with protective gas, the soft package semi-finished product of the ETP bipolar battery is cleaned by the protective gas, the cleaning gas is argon gas for three times, in the embodiment, the cleaned soft package semi-finished product of the ETP bipolar battery leaves the inlet transition bin 41 from a first outlet of the inlet transition bin 41 and enters a liquid injection zone 42, a liquid injection machine or is connected with an external liquid injection machine is arranged in the liquid injection zone 42, the injection needle of the injection machine is aligned with the injection port of the soft package semi-finished product of the ETP bipolar battery to perform quantitative injection, electrolyte is guaranteed to enter the formation area 43 after being infiltrated, the formation area 43 provides a constant temperature environment, the formation area 43 is provided with an electric interface so that the soft package semi-finished product of the ETP bipolar battery in the formation area 43, which is injected with the electrolyte, is electrically connected with an external formation system, the formation system activates positive and negative

active materials

15 and 14 of the soft package semi-finished product of the bipolar battery, the soft package semi-finished product of the ETP bipolar battery is electrically connected with the external formation system through the electric interface through a metal lead-out tab, and because the gas production phenomenon occurs in the formation process, the gas needs to be timely discharged, the low water-oxygen ratio of a low dew point environment is guaranteed, the optimal water-oxygen ratio is less than or equal to 1 ppm, and an exhaust device needs to be arranged in the formation area.

The semi-finished product of the ETP bipolar battery enters the packaging area 44 after the formation of the exhaust gas is finished, the packaging area 44 is connected with a vacuumizing device, the vacuumizing device vacuumizes the packaging area 44, meanwhile, the clamp pressurizes the semi-finished product of the ETP bipolar battery, the upper end of the semi-finished product of the ETP bipolar battery is sealed in a thermoplastic mode, the sealed soft package of the ETP bipolar battery enters the outlet transition bin 45 from the second inlet of the outlet transition bin 45, capacity detection equipment is arranged in the outlet transition bin 45, the capacity detection equipment detects the soft package of the ETP bipolar battery, whether the electric capacity reaches the standard or not is determined, and the soft package of the ETP bipolar battery reaching the standard is produced from the second outlet of the outlet transition bin 45. The whole set of process meets the requirements of liquid injection, formation and sealing of the soft package of the ETP bipolar battery, realizes high-integration design, can be continuously produced, and ensures a low dew point environment, wherein the soft package opening is subjected to one process only, thereby reducing the process risk and improving the yield and consistency. As shown in the following table 1, from the view point of process engineering, the conventional sectional liquid injection, formation and sealing processes are more, and the risk management and control are difficult. The manufacturing equipment of the energy storage device provided by the utility model can integrate different working procedures at high degree, maintain a low dew point environment in the whole process, effectively control failure and improve the actual yield by about 10%.

TABLE 1 yield comparison of existing Process and ETP Integrated Process

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. An apparatus for manufacturing an energy storage device, characterized in that: the manufacturing equipment comprises an inlet transition bin, a packaging bin and an outlet transition bin;

the inlet transition bin comprises a first inlet and a first outlet, and after the bipolar battery soft package semi-finished product is connected to the formation system through the metal lead-out electrode lug, the bipolar battery soft package semi-finished product enters the inlet transition bin from the first inlet, the inlet transition bin is filled with protective gas, and the protective gas cleans the bipolar battery soft package semi-finished product;

2. The apparatus for manufacturing an energy storage device according to claim 1, wherein a liquid injection machine or an external connection independent liquid injection machine is integrally arranged in the liquid injection area, the liquid injection machine is provided with a liquid injection needle, and the liquid injection needle is combined with a liquid injection port of the bipolar battery soft package semi-finished product to perform quantitative liquid injection.

3. The apparatus for manufacturing an energy storage device according to claim 1, wherein the shielding gas in the inlet transition bin is argon, and the number of times of cleaning the bipolar battery soft pack semi-finished product is three.

4. The apparatus for manufacturing an energy storage device according to claim 1, wherein the packaging bin is sealed and connected to the dehumidifier, and the packaging bin is guaranteed to be in a low water-oxygen ratio state, and the water-oxygen ratio is less than or equal to 1 ppm.

5. The apparatus according to claim 2, wherein the formation region is provided with an electrical interface for electrically connecting the injected bipolar battery soft pack semi-finished product in the formation region with an external formation system that activates positive and negative active materials of the bipolar battery soft pack semi-finished product.

6. The apparatus for manufacturing an energy storage device according to claim 5, wherein the semi-finished product of the soft pack of the bipolar battery is fixed by a jig before entering the inlet transition bin, both sides and the bottom surface of the semi-finished product of the soft pack of the bipolar battery are thermoplastic-encapsulated, and the upper end is in an open state.

7. The apparatus for manufacturing an energy storage device according to claim 6, wherein the bipolar battery soft pack semi-finished product is led out of a tab through a metal, and the tab is electrically connected with an external formation system through the electrical interface.

8. The apparatus for manufacturing an energy storage device according to claim 5, wherein the formation region is further provided with an exhaust means for exhausting gas generated at the formation of the bipolar battery pack semi-finished product.

9. The apparatus for manufacturing an energy storage device according to claim 6, wherein a vacuum-pumping device and a clamp pressurizing device are arranged in the packaging area, and the vacuum-pumping device starts to work after the formed semi-finished product of the soft bipolar battery pack enters the packaging area.

10. The apparatus for manufacturing an energy storage device according to claim 9, wherein the bipolar battery pack is provided with aluminum films on both sides, the jigs are clamped to the aluminum films on both sides, and the jig pressurizing means pressurizes the jigs to thermoplastically seal the bipolar battery pack semi-finished product.