High-safety rotating disc type secondary sealing machine box body structure of soft package secondary battery

Abstract

The utility model discloses a soft package secondary battery rotating disc type two-sealing machine box body structure with high safety, which comprises a box body, a vacuum air exhaust sealing cavity arranged at the upper part of the box body in the box body and a waste liquid tank arranged at the lower part of the box body, and the waste liquid tank is communicated with a closed waste liquid barrel at the bottom of the box body through a waste liquid pipe. The high-safety rotating disc type secondary sealing machine box body structure for the soft package secondary battery has the characteristics of high safety, environment friendliness and simple structure.

Description

Technical Field

[0001] The utility model relates to the technical field of secondary batteries, in particular to a soft-pack secondary battery turntable-type double-sealed chassis structure with high safety. Background Art

[0002] The secondary sealing process for soft-pack batteries refers to further packaging work after the initial sealing of the soft-pack batteries to ensure the safety and stability of the batteries. This secondary sealing process can improve the safety and stability of soft-pack batteries and ensure that the batteries will not leak or have other safety issues during use.

[0003] In the secondary sealing process of soft-pack batteries, a rotary table secondary sealing machine is generally used. The upper and lower cavities are used to form a closed cavity during packaging. The bayonet in the cavity pierces the pre-packaged air bag, and the vacuum pump extracts the air in the cavity to a set negative pressure value, so that the gas and excess electrolyte in the battery cell are discharged. Finally, the upper and lower heads use the heat conduction effect to act on the battery packaging material (aluminum-plastic film) for heat sealing, and the excess electrolyte in the battery cell is extracted in the cavity and leaks into the waste liquid tank of the secondary sealing machine.

[0004] Electrolytes are a crucial component of secondary batteries. For example, in lithium-ion batteries, they are typically composed of lithium salts and organic solvents, playing a crucial role in conducting ions between the positive and negative electrodes. Extensive, long-term testing has demonstrated that batteries made with fluorine-containing lithium salts offer superior performance, particularly those made with LiPF6, which boast advantages such as high adaptability, no explosion hazard, and eco-friendliness. However, LiPF6 is highly unstable, beginning to decompose at just 20 degrees Celsius. Furthermore, LiPF6 readily absorbs water, which reacts with a small amount of water vapor to produce HF (H2O + LiPF6 → POF3 + LiF + 2HF). HF is a weakly acidic gas with a pungent odor. Inhalation of HF is highly harmful to the human body, posing a serious safety hazard.

[0005] Furthermore, in rotary-plate secondary sealing machines, large amounts of electrolyte remain in the waste tank without prompt removal and are exposed to the air for extended periods. LiPF6 absorbs water, generating large amounts of HF gas, which fills the entire operating room with a highly pungent, noxious gas. Operators are constantly exposed to the dangers of inhaling HF gas during the secondary sealing process. This irritant gas can be very harmful to the human body, ranging from mild discomfort to severe disability, posing a significant safety hazard. Utility Model Content

[0006] The utility model aims to provide a highly safe soft-pack secondary battery turntable double-sealed chassis structure, which has the characteristics of high safety, environmental protection and simple structure.

[0007] The utility model can be realized by the following technical solutions:

[0008] The utility model discloses a highly safe turntable double-sealed box structure for soft-packed secondary batteries, comprising a box body, wherein the box body is provided with a vacuum sealing cavity at the upper part of the box body and a waste liquid tank at the lower part of the box body, and the waste liquid tank is connected to a sealed waste liquid barrel at the bottom of the box body through a waste liquid pipe.

[0009] Furthermore, a circular second sealing machine is built into the vacuum sealing chamber and is placed in a sealed manner inside the box body through a chamber sealing door. By adopting a circular second sealing machine, the internal space of the box body is fully utilized, and the structure is more compact.

[0010] Furthermore, the chamber sealing door is a two-way closing structure, and the chamber sealing door or the box body is provided with a sealing chamber exhaust hole connected to the vacuum exhaust sealing cavity air path, which not only ensures airtightness but also facilitates the vacuum operation inside.

[0011] Furthermore, an alkaline solution filter barrel is provided at the bottom of the box body, and the alkaline solution filter barrel is connected to the vacuum sealing cavity air path through an exhaust pipe, thereby preventing acidic gas from flowing into the atmosphere.

[0012] Furthermore, the box body is provided with a sealing chamber air inlet hole connected to the vacuum sealing cavity air path, so as to facilitate the ventilation operation in the cavity.

[0013] Furthermore, a control panel and a vacuum pressure gauge are provided on the box body to facilitate visual operation and control.

[0014] Furthermore, the control panel is a button panel or a touch screen panel to facilitate the operation process.

[0015] Furthermore, the box body is a stainless steel box body, and the chamber sealing door is a stainless steel door body provided with a transparent window to realize visual operation.

[0016] Furthermore, a plurality of sealing strips are provided at the contact point between the box body and the chamber sealing door to effectively ensure air tightness.

[0017] Furthermore, the soft-pack secondary battery is a lithium-ion battery or a sodium-ion battery, which meets the usage requirements of different battery types.

[0018] The utility model provides a highly safe soft-pack secondary battery turntable double-sealed chassis structure, which has the following beneficial effects:

[0019] First, the box structure of this utility model is highly safe, effectively absorbing harmful HF gas and protecting the health of employees. In actual production, a large amount of electrolyte is retained in the waste liquid tank and exposed to the air. The HF gas generated by the LiPF6 in the electrolyte absorbs water. The HF gas is absorbed by an alkaline solution such as calcium hydroxide to form a precipitate CaF2. HF + Ca (OH) 2 → CaF2↓ + H2O. CaF2 is insoluble in water and appears as colorless crystals, which can be used in other industries.

[0020] Second, it is green and environmentally friendly. The box structure of this utility model controls the diffusion of harmful gases and reduces air pollution. When the operating room is ventilated to reduce irritating odors, a large amount of HF enters the atmosphere. HF reacts with the water droplets in the mist formed by water vapor to produce acidic substances, mainly fluoride ions (F-) and hydrogen ions (H-). These acidic substances make the water droplets in the mist acidic, forming acid rain. The new non-irritating odor-free second-sealing machine can absorb harmful HF gases in a timely manner, preventing them from diffusing to the outdoors and mixing with the atmosphere to form acidic substances, thereby effectively protecting the atmospheric environment.

[0021] Third, the structure is simple. The box structure of the utility model makes full use of the enclosed space inside the box to form a reasonable vacuum sealing cavity, waste liquid tank, and enclosed waste liquid barrel structure. The gold hook is compact and simplified, which is easy to manufacture and put into use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Attachment Figure 1 This is a structural diagram of a high-safety soft-pack secondary battery turntable double-sealed chassis structure of the utility model;

[0023] The markings in the accompanying drawings include: 1. vacuum pressure gauge; 2. control panel; 3. vacuum sealing chamber; 4. chamber sealing door; 5. sealing strip; 6. waste liquid tank; 7. sealing chamber air extraction hole; 8. sealing chamber air inlet hole; 9. waste liquid pipe; 10. sealed waste liquid barrel; 11. exhaust pipe; 12. alkaline 2 solution filter barrel. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in further detail below in conjunction with embodiments.

[0025] like Figure 1As shown, the present invention discloses a highly safe, turntable-type, dual-sealed chassis structure for soft-pack secondary batteries. The chassis comprises a housing, which is provided with a vacuum sealing chamber 3 at the upper portion of the housing and a waste liquid tank 6 at the lower portion. The waste liquid tank 6 is connected to a sealed waste liquid barrel 10 at the bottom of the housing via a waste liquid pipe 9. An alkaline solution filter barrel 12 is also provided at the bottom of the housing, which is in air communication with the vacuum sealing chamber 3 via an air extraction pipe 11.

[0026] In this utility model, to ensure airtightness, a circular double sealer is built into the vacuum sealing chamber 3. This double sealer is hermetically placed within the box body via a chamber sealing door 4. Specifically, the chamber sealing door 4 is a two-way closed structure; the box body is made of stainless steel, and the chamber sealing door 4 is a stainless steel door with a transparent window. Several sealing strips 5 are installed at the contact points between the box body and the chamber sealing door 4.

[0027] In the present invention, in order to realize vacuum and ventilation operation, the chamber sealing door or the box body is provided with a sealed chamber exhaust hole 7 which is in air communication with the vacuum exhaust sealing cavity 3. The box body is also provided with a sealed chamber air inlet hole 8 which is in air communication with the vacuum exhaust sealing cavity 3.

[0028] In the present invention, for easy operation, the box body is further provided with a control panel 2 and a vacuum pressure gauge 1. Specifically, the control panel is a key panel or a touch screen panel.

[0029] In the present invention, there is no special limitation on the battery type, for example, the soft-pack secondary battery is a lithium-ion battery or a sodium-ion battery.

[0030] In the present invention, the secondary sealing machine is circular in shape, with the purpose of saving space more reasonably when sealing the chamber sealing door 4. Taking lithium-ion batteries as an example, when the battery cell is secondary sealed, it is activated through the control panel 2. When the battery cell is secondary sealed in the vacuum evacuation sealing chamber 3, the excess electrolyte flows into the waste liquid tank 6 and enters the sealed waste liquid barrel 10 through the waste liquid pipe 9. This can effectively prevent the waste liquid from not being cleaned in time and being exposed to the air for a long time, and the LiPF6 absorbs water and generates a large amount of HF gas. After the vacuum evacuation sealing chamber 3 is raised, the battery cell has been sealed, but a small amount of HF gas will still remain in the vacuum evacuation sealing chamber 3 and the waste liquid tank 9. At this time, the chamber sealing door 4 is closed in both directions, and the sealing chamber exhaust hole 7 is used to exhaust the entire cavity again. The residual HF gas is absorbed by the alkaline solution filter barrel 12 through the exhaust pipe 11. The exhaust time is controlled by the control panel 2, and the sealing chamber air inlet 8 enters the air, and the chamber sealing door 4 is opened to operate the next batch of battery cells. The sealed chamber is evacuated and filtered again to effectively absorb the residual HF gas, strictly prevent the diffusion of HF gas in the air, avoid the generation of irritating and harmful gases, ensure the health of employees, and at the same time play a good protective role in the atmospheric environment.

[0031] In the description of the present invention, it should be understood that terms such as "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0033] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0034] The above embodiments are merely specific embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art will be able to make various modifications and improvements without departing from the scope of the present invention, and these obvious alternatives are all within the scope of protection of the present invention.

Claims

1. A highly safe, turntable-type, double-sealed housing structure for soft-packed secondary batteries, comprising a housing body, characterized in that: The box body is provided with a vacuum sealing cavity at the upper part of the box body and a waste liquid tank at the lower part of the box body. The waste liquid tank is connected with the sealed waste liquid barrel at the bottom of the box body through a waste liquid pipe.

2. The highly safe rotary disc double-sealed chassis structure for soft-packed secondary batteries according to claim 1, characterized in that: A circular second sealing machine is built into the vacuum sealing cavity, and the second sealing machine is placed in the interior of the box body in a sealed manner through a chamber sealing door.

3. The highly safe rotary disc double-sealed chassis structure for soft-packed secondary batteries according to claim 2, characterized in that: The chamber sealing door is a two-way closed structure, and the chamber sealing door or the box body is provided with a sealing chamber exhaust hole connected to the vacuum exhaust sealing cavity air path.

4. The highly safe rotary disc double-sealed chassis structure for soft-packed secondary batteries according to claim 3, characterized in that: An alkaline solution filter barrel is further provided at the bottom of the box body, and the alkaline solution filter barrel is communicated with the vacuum exhaust sealing cavity air path through an exhaust pipe.

5. The highly safe rotary disc double-sealed chassis structure for soft-packed secondary batteries according to claim 4, characterized in that: The box body is also provided with a sealing chamber air inlet hole which is connected with the vacuum sealing chamber air path.

6. The highly safe rotary disc double-sealed chassis structure for soft-packed secondary batteries according to claim 5, characterized in that: The box body is also provided with a control panel and a vacuum pressure gauge.

7. The highly safe rotary disc double-sealed chassis structure for soft-packed secondary batteries according to claim 6, characterized in that: The control panel is a key panel or a touch screen panel.

8. The highly safe rotary disc double-sealed chassis structure for soft-packed secondary batteries according to claim 7, characterized in that: The box body is a stainless steel box body, and the chamber sealing door is a stainless steel door body provided with a transparent window.

9. The highly safe rotary disc double-sealed chassis structure for soft-packed secondary batteries according to claim 8, characterized in that: A plurality of sealing strips are provided at the contact point between the box body and the chamber sealing door.

10. The highly safe rotary disc double-sealed chassis structure for soft-packed secondary batteries according to claim 9, characterized in that: The soft-pack secondary battery is a lithium-ion battery or a sodium-ion battery.

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