Exhaust device for battery formation

Abstract

The utility model provides an exhaust device for battery formation, and relates to the technical field of battery formation. The air exhaust device comprises an air exhaust pipeline, an air inlet pipe, an air outlet pipe, an air inlet pipe and an air outlet pipe, the liquid storage assembly is provided with a liquid storage cavity, the first end of the liquid storage assembly is communicated with the gas inlet, the second end of the liquid storage assembly is used for being communicated with a liquid injection opening of the battery, the size of the cross section of the liquid storage cavity is larger than the caliber of the liquid injection opening, and gas in the battery enters the exhaust pipe after passing through the liquid storage assembly. According to the exhaust device, the electrolyte can be prevented from flowing into the exhaust pipeline, loss of the electrolyte is avoided, and the electrolyte is prevented from crystallizing in the exhaust pipeline and blocking the exhaust pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of battery formation, in particular to an exhaust device used for battery formation. Background Art

[0002] Lithium-ion batteries need to be vacuumed during the formation process. Lithium titanate batteries produce a lot of gas. When the battery core is vacuumed during the formation process, the electrolyte can easily be drawn into the pipeline of the formation device, causing the electrolyte content to decrease, thus affecting battery performance. In addition, the electrolyte that enters the formation pipeline will also block the exhaust pipeline due to crystallization.

[0003] With regard to the problem that the electrolyte is easily sucked into the pipeline of the formation device during the vacuum pumping process of the above-mentioned lithium-ion battery formation, no effective solution has been proposed so far. Utility Model Content

[0004] The main purpose of the utility model is to provide an exhaust device for battery formation, so as to solve the technical problem that electrolyte is easily sucked into the pipeline of the formation device during the vacuum pumping process of battery formation.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, there is provided an exhaust device for battery formation, comprising: an exhaust pipe, the exhaust pipe having an air inlet and an exhaust port; a liquid storage assembly, the liquid storage assembly having a liquid storage cavity, the first end of the liquid storage assembly being connected to the air inlet, the second end of the liquid storage assembly being used to be connected to the liquid injection port of the battery, the cross-sectional size of the liquid storage cavity being larger than the caliber of the liquid injection port, and the gas in the battery enters the exhaust pipe after passing through the liquid storage assembly.

[0006] Furthermore, the axis of the air inlet is arranged perpendicularly to the axis of the exhaust port, there are multiple air inlets, and the multiple air inlets are arranged at intervals along the axial direction of the exhaust pipe, and each air inlet is connected to a liquid storage component.

[0007] Furthermore, the second end of the liquid storage assembly is connected to the liquid filling port of the battery through a first air inlet pipe, and the diameter of the first air inlet pipe is smaller than the cross-sectional size of the liquid storage cavity.

[0008] Furthermore, the liquid storage component includes: a liquid storage cup, the cavity of the liquid storage cup forms a liquid storage cavity, there are at least two liquid storage cups, at least two liquid storage cups are connected in series, and two adjacent liquid storage cups are connected through a second air inlet pipe, and the diameter of the second air inlet pipe is smaller than the cup diameter of the liquid storage cup.

[0009] Furthermore, at least one liquid storage cup in the liquid storage assembly is an integrally formed structure with the exhaust pipe.

[0010] Furthermore, the liquid storage cup is provided with a connecting port, which is a funnel-shaped structure, and the small-diameter end of the connecting port is connected to the second air inlet pipe.

[0011] Furthermore, a first isolation membrane is provided between the liquid storage assembly and the air inlet of the exhaust pipe, and the gas in the battery enters the exhaust pipe after passing through the first isolation membrane.

[0012] Furthermore, the first isolation membrane is detachably connected to the liquid storage assembly.

[0013] Furthermore, the first isolation membrane is multi-layered, and the multi-layered first isolation membranes are arranged at intervals along the axial direction of the liquid storage component.

[0014] Furthermore, a second isolation membrane is provided at the exhaust port, and the gas in the battery is discharged from the exhaust port after passing through the second isolation membrane.

[0015] By applying the technical solution of the utility model, during the formation process of the battery, the electrolyte and gas in the battery flow into the liquid storage chamber. Since the cross-sectional size of the liquid storage chamber is larger than the diameter of the injection port, after the electrolyte flows into the liquid storage chamber, the liquid storage space becomes larger, the hydraulic pressure of the electrolyte decreases, and the electrolyte cannot enter the exhaust pipe through the liquid storage chamber, and eventually flows back into the battery due to gravity. The above-mentioned exhaust device can prevent the electrolyte from flowing into the exhaust pipe, avoid the loss of the electrolyte, and prevent the electrolyte from crystallizing in the exhaust pipe and blocking the exhaust pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 A schematic structural diagram of a first embodiment of an exhaust device according to the utility model is shown;

[0018] Figure 2 A schematic structural diagram of a second embodiment of an exhaust device according to the utility model is shown.

[0019] The above drawings include the following reference numerals:

[0020] 1. Exhaust duct; 11. Air inlet; 12. Exhaust outlet;

[0021] 2. Liquid storage cup;

[0022] 3. First air intake pipe;

[0023] 4. Second air intake pipe;

[0024] 5. A first isolation film;

[0025] 6. Second isolation film;

[0026] 7. Battery. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of the layers and regions may be enlarged, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0031] Combination Figure 1 to Figure 2 As shown, according to a specific embodiment of the present application, a venting device for battery formation is provided.

[0032] Specifically, the exhaust device includes an exhaust pipe 1 and a liquid storage assembly, the exhaust pipe 1 has an air inlet 11 and an exhaust port 12; the liquid storage assembly has a liquid storage cavity, the first end of the liquid storage assembly is connected to the air inlet 11, and the second end of the liquid storage assembly is used to connect to the liquid injection port of the battery 7, the cross-sectional size of the liquid storage cavity is larger than the diameter of the liquid injection port, and the gas in the battery 7 enters the exhaust pipe after passing through the liquid storage assembly.

[0033] When the technical solution of this embodiment is applied, during the formation process of the battery 7, the electrolyte and gas in the battery 7 flow into the liquid storage chamber. Since the cross-sectional size of the liquid storage chamber is larger than the diameter of the injection port, after the electrolyte flows into the liquid storage chamber, the liquid storage space becomes larger, the hydraulic pressure of the electrolyte decreases, and the electrolyte cannot enter the exhaust pipe through the liquid storage chamber, and eventually flows back into the battery due to gravity. The above-mentioned exhaust device can prevent the electrolyte from flowing into the exhaust pipe, avoid the loss of the electrolyte, and prevent the electrolyte from crystallizing in the exhaust pipe and blocking the exhaust pipe.

[0034] Specifically, the axis of the air inlet 11 is arranged perpendicularly to the axis of the exhaust port 12, and there are multiple air inlets 11, which are arranged at intervals along the axis direction of the exhaust pipe 1, and each air inlet 11 is connected to a liquid storage assembly. In this way, the exhaust operation of multiple batteries 7 during formation can be performed simultaneously, and each air inlet 11 can correspond to an exhaust operation station of a battery 7, thereby improving the production and formation efficiency of the battery 7.

[0035] Specifically, the second end of the liquid storage assembly is connected to the liquid injection port of the battery 7 through the first air inlet pipe 3, and the diameter of the first air inlet pipe 3 is smaller than the cross-sectional size of the liquid storage chamber. This arrangement ensures that when the battery 7 is vented, when the electrolyte discharged along with the gas flows to the liquid storage chamber, the exhaust cross-sectional size of the liquid storage chamber is larger than the first air inlet pipe 3, resulting in a sudden increase in the exhaust cross-sectional area, so that the electrolyte no longer flows upward with the gas, and the electrolyte can remain in the liquid storage chamber, achieving the effect of the first gas-liquid separation.

[0036] Specifically, the liquid storage assembly includes a liquid storage cup 2, the cavity of the liquid storage cup 2 forms a liquid storage cavity, there are at least two liquid storage cups 2, at least two liquid storage cups 2 are connected in series, and two adjacent liquid storage cups 2 are connected through a second air intake pipe 4, and the diameter of the second air intake pipe 4 is smaller than the cup diameter of the liquid storage cup 2. Multiple liquid storage cups 2 are provided to perform multiple speed reduction buffering on the electrolyte, thereby reducing the probability of the electrolyte entering the exhaust pipe 1.

[0037] Preferably, two liquid storage cups 2 are provided, and the sum of the volumes of the two liquid storage cups 2 is greater than the total volume of the electrolyte, thereby ensuring that the electrolyte does not flow into the air inlet 11 and flows back into the battery 7 after the exhaust operation is completed, thereby reducing the degree of electrolyte loss in the battery 7.

[0038] Among them, at least one liquid storage cup 2 in the liquid storage assembly is an integrally formed structure with the exhaust pipe 1. The use of an integrally formed structure can increase the overall air tightness of the exhaust device, ensure the stability of the exhaust operation, and prevent the air outside the device from interfering with the exhaust operation.

[0039] Preferably, a liquid storage cup 2 near the air inlet 11 is integrally formed with the exhaust pipe 1. Only one liquid storage cup 2 is integrally formed with the exhaust pipe 1. While increasing the air tightness of the exhaust pipe 1, it can be subsequently detachably connected with multiple liquid storage cups 2 according to the model of the battery 7 to be formed, thereby improving the practicality of the exhaust device. The subsequent detachable connection facilitates the cleaning and maintenance of the exhaust device and the liquid storage assembly, and prevents the electrolyte crystallization remaining in the liquid storage assembly from clogging the exhaust pipe 1.

[0040] Furthermore, the liquid storage cup 2 is provided with a connection port, which is a funnel-shaped structure, and the small-diameter end of the connection port is connected to the second air inlet pipe 4. This arrangement can facilitate the gas and electrolyte to flow from the liquid storage cup 2 into the second air inlet pipe 4 or from the first air inlet pipe 3 into the liquid storage cup 2, thereby increasing the stability of the connection end between the liquid storage cup 2 and the air inlet pipe.

[0041] Furthermore, a first isolation membrane 5 is provided between the liquid storage assembly and the air inlet 11 of the exhaust pipe 1, and the gas in the battery 7 enters the exhaust pipe after passing through the first isolation membrane 5. The first isolation membrane 5 plays an isolating role, preventing the electrolyte from flowing into the exhaust pipe 1 through the air inlet 11, while ensuring that the gas can enter the exhaust pipe through the first isolation membrane. Specifically, the first isolation membrane 5 is detachably connected to the liquid storage assembly. This arrangement allows for regular inspection and replacement of the first isolation membrane 5 and the liquid storage assembly, avoiding electrolyte crystallization from clogging the exhaust pipe 1 or forming a layer of electrolyte on the surface of the first isolation membrane 5, which hinders the passage of gas and can extend the service life of the equipment.

[0042] Specifically, the first isolation membrane 5 is multi-layered, and the multi-layer first isolation membrane 5 is arranged at intervals along the axial direction of the liquid storage assembly. Such an arrangement can filter the exhaust gas multiple times to prevent the electrolyte from entering the main exhaust pipe, making it difficult for the electrolyte to flow back and causing the main exhaust pipe to be blocked.

[0043] Furthermore, a second isolation membrane 6 is provided at the exhaust port 12, and the gas in the battery 7 is discharged from the exhaust port 12 after passing through the second isolation membrane 6. The provision of the second isolation membrane 6 ensures that no electrolyte is discharged from the exhaust port 12, thereby avoiding the possibility of contamination or corrosion of external equipment caused by electrolyte discharge.

[0044] The present application also provides a preferred embodiment of an exhaust device for battery formation, which prevents the electrolyte from flowing into the main exhaust duct with the gas and being discharged from the exhaust pipe by adding two or more liquid storage cups 2 and an isolation membrane, causing the battery 7 to have a low liquid phenomenon.

[0045] Specifically, Figure 1As shown, an exhaust device for battery formation includes an exhaust pipeline 1, a liquid storage cup 2, an isolation membrane, an air inlet 11, an exhaust port 12 and an exhaust pipe. The exhaust pipeline 1 includes a main exhaust pipeline and multiple exhaust pipes. The main exhaust pipe is arranged horizontally, and the main exhaust pipe has multiple air inlets 11 and an exhaust port 12; the liquid storage cup 2 is arranged vertically to buffer the rising gas; the isolation membrane can only allow gas to pass through, but not liquid, to prevent the electrolyte from flowing into the main exhaust pipeline, and the electrolyte stored in the liquid storage cup 2 can flow back to the inside of the battery 7, and the isolation membrane mainly includes an ion exchange membrane and a gas permeable membrane.

[0046] There are two or more liquid storage cups 2. Since the volume of the liquid storage cup 2 suddenly increases, it has a buffering effect on the electrolyte ejected with the gas, and the spatial volume of the liquid storage cup 2 is larger than the volume of the electrolyte discharged, so that the electrolyte can be completely recovered; the isolation membrane can be provided with one or more layers, and the isolation membrane can be placed above the liquid storage cup 2, and can also be set at the position of the exhaust port 12. The isolation membrane needs to be replaced regularly to prevent a layer of electrolyte from forming on the surface of the isolation membrane to hinder the passage of gas.

[0047] like Figure 2 As shown, when in use, the lower ends of the small diameter sections of the multiple liquid storage cups 2 are connected to the multiple first air inlet pipes 3 and are connected to the multiple batteries 7. During formation, the gas containing the electrolyte is discharged from the injection hole of the cylindrical battery 7 and enters the liquid storage cup 2 through the exhaust pipe. Due to the sudden increase in space, the electrolyte may remain in the liquid storage cup 2. When passing through the topmost first isolation membrane 5, the electrolyte is completely stored in the liquid storage cup 2 and cannot flow into the main exhaust pipe. Moreover, the electrolyte in the liquid storage cup 2 can flow back to the inside of the battery 7, which will not cause the problem of reduced electrolyte content during formation.

[0048] From the above description, it can be seen that the exhaust device adopted in the above-mentioned embodiment of the utility model, after adding the large-diameter liquid storage cup 2, plays a buffering role for the electrolyte extracted with the gas. The most critical thing is that the isolation membrane will filter the electrolyte, so that the electrolyte cannot be discharged into the main exhaust pipe with the gas, and the electrolyte retained in the liquid storage cup 2 can flow back to the inside of the battery 7, which will not cause the phenomenon of low liquid in the formation. The electrolyte circulates in the exhaust pipe, and the exhaust pipe 1 needs to be replaced regularly to avoid electrolyte crystallization blocking the exhaust pipe and extend the service life of the equipment.

[0049] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0050] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present utility model.

[0051] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0052] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An exhaust device for battery formation, characterized in that: include: An exhaust duct (1), the exhaust duct (1) having an air inlet (11) and an exhaust port (12); a liquid storage component, the liquid storage component comprising a liquid storage cavity, a first end of the liquid storage component being in communication with the air inlet (11), a second end of the liquid storage component being in communication with the liquid injection port of the battery (7), a cross-sectional dimension of the liquid storage cavity being larger than a diameter of the liquid injection port, and gas in the battery (7) entering the exhaust pipe after passing through the liquid storage component; The liquid storage component comprises: A liquid storage cup (2), wherein the cavity of the liquid storage cup forms the liquid storage cavity, the liquid storage cup (2) is at least two, the at least two liquid storage cups (2) are connected in series, and two adjacent liquid storage cups (2) are connected via a second air inlet pipe (4), and the diameter of the second air inlet pipe (4) is smaller than the cup diameter of the liquid storage cup (2).

2. The exhaust device for battery formation according to claim 1, characterized in that: The axis of the air inlet (11) is arranged perpendicularly to the axis of the exhaust port (12); there are a plurality of air inlets (11), the plurality of air inlets (11) are arranged at intervals along the axial direction of the exhaust pipe (1), and each of the air inlets (11) is connected to the liquid storage assembly.

3. The exhaust device for battery formation according to claim 1, characterized in that: The second end of the liquid storage assembly is connected to the liquid injection port of the battery (7) via a first air inlet pipe (3); the diameter of the first air inlet pipe (3) is smaller than the cross-sectional size of the liquid storage cavity.

4. The exhaust device for battery formation according to claim 1, characterized in that: At least one of the liquid storage cups (2) in the liquid storage assembly and the exhaust pipe (1) are integrally formed structures.

5. The exhaust device for battery formation according to claim 1, characterized in that: The liquid storage cup (2) is provided with a connection port, the connection port is a funnel-shaped structure, and the small-diameter end of the connection port is connected to the second air inlet pipe (4).

6. The exhaust device for battery formation according to claim 1, characterized in that: A first isolation membrane (5) is provided between the liquid storage assembly and the air inlet (11) of the exhaust pipe (1), and the gas in the battery (7) enters the exhaust pipe after passing through the first isolation membrane (5).

7. The exhaust device for battery formation according to claim 6, characterized in that: The first isolation membrane (5) is detachably connected to the liquid storage assembly.

8. The exhaust device for battery formation according to claim 6, characterized in that: The first isolation film (5) is multi-layered, and the multi-layered first isolation film (5) is arranged at intervals along the axial direction of the liquid storage component.

9. The exhaust device for battery formation according to claim 1, characterized in that: A second isolation membrane (6) is provided at the exhaust port (12), and the gas in the battery (7) is discharged from the exhaust port (12) after passing through the second isolation membrane (6).

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