Battery explosion-proof valve, battery monomer and battery

Abstract

The utility model discloses a battery explosion-proof valve, a battery monomer and a battery, and relates to the technical field of batteries. The battery anti-explosion valve comprises a valve body, a dehumidification part, a water separation part and an oil separation part, an exhaust port is formed in the end of the valve body, a communicating cavity is formed in the valve body, and an air inlet of the valve body is formed by an opening of the communicating cavity; the dehumidification part is arranged in the communicating cavity and connected with the valve body, and the dehumidification part is arranged close to the exhaust port; the water separation piece is arranged in the communicating cavity and connected with the valve body, and the water separation piece is arranged close to the air inlet; the oil separation part is arranged in the communication cavity and connected with the valve body, the oil separation part is arranged between the dehumidification part and the water separation part, and the oil separation part, the dehumidification part and the water separation part are arranged at intervals. The battery anti-explosion valve provided by the utility model not only has anti-explosion and pressure relief functions, but also has the functions of preventing liquid leakage and preventing external water vapor from entering the battery cell.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery explosion-proof valve, a battery cell, and a battery. Background Art

[0002] The current battery explosion-proof valve is designed to open and release pressure after the cumulative gas production reaches a certain level. The internal and external parts of the battery cell are separated from each other. This design requires the explosion-proof valve to release pressure safely and reliably, and the material of the explosion-proof valve must be special.

[0003] The existing explosion-proof valve has a single function. Utility Model Content

[0004] In view of this, the present application provides a battery explosion-proof valve, a battery cell and a battery, aiming to solve one of the technical problems in the prior art.

[0005] To achieve the above objectives, the technical solutions adopted in this application are as follows:

[0006] In a first aspect, an embodiment of the present application provides a battery explosion-proof valve, comprising:

[0007] A valve body, wherein an exhaust port is formed at an end of the valve body, a communication cavity is formed inside the valve body, and an opening of the communication cavity forms an air inlet of the valve body;

[0008] a dehumidifying element, disposed in the communicating cavity and connected to the valve body, the dehumidifying element being disposed near the exhaust port;

[0009] a water barrier disposed in the communicating cavity and connected to the valve body, the water barrier being disposed close to the air inlet;

[0010] An oil separator is provided in the communicating cavity and is connected to the valve body. The oil separator is provided between the dehumidifying component and the water separator, and is spaced apart from the dehumidifying component and the water separator respectively.

[0011] In one embodiment of the first aspect, the dehumidifying element includes at least one dehumidifying sheet arranged at intervals, and at least one first groove is provided on the cavity wall of the communicating cavity, and an edge of one of the dehumidifying sheets is correspondingly engaged in one of the first grooves.

[0012] In one embodiment of the first aspect, the dehumidification sheet has a thickness of 0.5 to 3 mm.

[0013] In one embodiment of the first aspect, the water barrier comprises at least one spaced-apart water barrier, and at least one second groove is provided on the cavity wall of the communicating cavity, and an edge of one of the water barrier is correspondingly engaged in one of the second grooves.

[0014] In one embodiment of the first aspect, the waterproof sheet has a thickness of 0.5 to 3 mm.

[0015] In one embodiment of the first aspect, the oil separator includes at least one oil separator arranged at intervals, and at least one third groove is provided on the cavity wall of the connecting cavity, and an edge of the oil separator is correspondingly engaged in one of the third grooves.

[0016] In one embodiment of the first aspect, the oil separator has a thickness of 0.3 to 2 mm.

[0017] In one embodiment of the first aspect, an external thread is provided on the outer side of the valve body.

[0018] In a second aspect, an embodiment of the present application further provides a battery cell, comprising the battery explosion-proof valve and top cover in any of the above embodiments, wherein the explosion-proof valve and the top cover are detachably connected.

[0019] In a third aspect, embodiments of the present application further provide a battery, comprising the battery explosion-proof valve in any of the above embodiments or the battery in any of the above embodiments.

[0020] Compared with the prior art, the present application has the following beneficial effects: the present application proposes a battery explosion-proof valve, comprising a valve body, a dehumidification component, a water barrier component, and an oil barrier component. An exhaust port is provided at the end of the valve body, and a connecting cavity is provided inside the valve body. The opening of the connecting cavity forms an air inlet of the valve body, and the connecting cavity connects the air inlet and the air outlet, so that the valve body has a pressure relief and explosion-proof function.

[0021] The dehumidifying element is arranged in the communicating cavity and connected to the valve body. The dehumidifying element is arranged near the exhaust port. The dehumidifying element dries the air passing through the exhaust port, thereby improving the reliability and safety of the battery.

[0022] The water barrier is arranged in the communication cavity and is connected to the valve body. The water barrier is arranged close to the air inlet. The water barrier blocks the water in the electrolyte of the battery cell to prevent leakage.

[0023] The oil separator is arranged in the connecting cavity and is connected to the valve body. The oil separator is arranged between the dehumidification component and the water barrier component. The oil separator is spaced apart from the dehumidification component and the water barrier component respectively so that the gas generated in the battery cell can efficiently pass through the connecting cavity and be discharged from the exhaust port. The oil separator blocks the organic matter in the electrolyte of the battery cell to prevent leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic structural diagram of a battery explosion-proof valve in some embodiments of the present application is shown;

[0026] Figure 2 Schematic diagram of the exploded structure of a battery explosion-proof valve in some embodiments of the present application is shown;

[0027] Figure 3 Schematic diagrams of the cross-sectional structure of battery explosion-proof valves in some embodiments of the present application are shown.

[0028] Explanation of the main component symbols: 100-battery explosion-proof valve; 110-valve body; 111-exhaust port; 112-connecting chamber; 113-air inlet; 120-dehumidification component; 121-dehumidification sheet; 114-first groove; 130-water barrier; 131-water barrier; 115-second groove; 140-oil barrier; 141-oil barrier; 116-third groove; 117-external thread. DETAILED DESCRIPTION

[0029] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 should not be understood as a limitation on the present application.

[0031] 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 defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0032] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0033] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0034] It is understandable that when the explosion-proof valve releases pressure, leakage of battery cells will cause safety problems, and safe pressure relief must be ensured when the pressure relief value is reached.

[0035] like Figure 1 and Figure 2 As shown, an embodiment of the present application provides a battery explosion-proof valve 100, primarily used for pressure relief and preventing battery cell leakage. The battery explosion-proof valve 100 includes a valve body 110, a dehumidification element 120, a water barrier 130, and an oil barrier 140. Multiple exhaust ports 111 are defined at the end of the valve body 110 to facilitate rapid pressure relief.

[0036] A connecting cavity 112 is provided inside the valve body 110. The opening of the connecting cavity 112 forms an air inlet 113 of the valve body 110. The air inlet 113 is connected to the battery cell. The gas generated by the battery cell flows to the air inlet 113 and reaches the connecting cavity 112. The connecting cavity 112 connects the air inlet 113 and the air outlet, so that the valve body 110 has a pressure relief and explosion-proof function.

[0037] The dehumidifying element 120 is disposed in the communicating cavity 112 and connected to the valve body 110 . The dehumidifying element 120 is disposed close to the exhaust port 111 . The dehumidifying element 120 dries the external air passing through the exhaust port 111 , thereby improving the reliability and safety of the battery.

[0038] The water barrier 130 is disposed in the communication cavity 112 and connected to the valve body 110 . The water barrier 130 is disposed close to the air inlet 113 . The water barrier 130 blocks water in the electrolyte of the battery cell to prevent leakage.

[0039] The oil separator 140 is arranged in the connecting cavity 112 and is connected to the valve body 110. The oil separator 140 is arranged between the dehumidification component 120 and the water barrier 130. The oil separator 140 is spaced apart from the dehumidification component 120 and the water barrier 130 respectively so that the gas generated in the battery cell can efficiently pass through the connecting cavity 112 and be discharged from the exhaust port 111. The oil separator blocks the organic matter in the electrolyte of the battery cell to prevent leakage.

[0040] Please refer to Figure 3 In some embodiments, the dehumidifying element 120 includes at least one dehumidifying sheet 121 spaced apart from each other. The wall of the communicating cavity 112 is provided with at least one first groove 114, and the edge of each dehumidifying sheet 121 is correspondingly engaged with one of the first grooves 114. The dehumidifying sheet 121 absorbs moisture entering the valve body 110 from the exhaust port 111 and prevents dust from the external air from entering the battery.

[0041] In this embodiment, there is one dehumidification sheet 121 and one first groove 114. This facilitates the rapid discharge of gas generated within the battery cell. In other embodiments, the number of dehumidification sheets 121 can be two, three, or four, and the number of dehumidification sheets 121 can be set as needed.

[0042] The dehumidifying sheet 121 is made of one of molecular sieve, hygroscopic resin, hygroscopic fiber or porous silica gel.

[0043] Molecular sieves are crystalline materials with microporous structures that efficiently absorb moisture from the air. Compared to conventional drying materials made with silica gel particles and calcium chloride powder, molecular sieve drying sheets offer better drying results and are less susceptible to chemical reactions, improving battery reliability and safety.

[0044] In some embodiments, the thickness of the dehumidifying sheet 121 is 0.5 to 3 mm. The thickness of the dehumidifying sheet 121 can be, but is not limited to, 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, or 3.0 mm. If the thickness of the dehumidifying sheet 121 is less than 0.5 mm, the dehumidifying effect of the dehumidifying sheet 121 is poor, and the dehumidifying sheet 121 is too thin and easily breaks during dehumidification. If the thickness of the dehumidifying sheet 121 is greater than 3 mm, dehumidification is hindered.

[0045] In some embodiments, the water barrier 130 includes at least one spaced water barrier 131 , and at least one second groove 115 is provided on the wall of the communicating cavity 112 . The edge of a water barrier 131 is correspondingly engaged in a second groove 115 .

[0046] In this embodiment, there is one water barrier 131 and one second groove 115. This facilitates the rapid discharge of gas generated within the battery cell. In other embodiments, the number of water barriers 131 can be two, three, or four, depending on the needs.

[0047] The water-isolating sheet 131 is made of one of polyethersulfone, polyvinylidene fluoride and polytetrafluoroethylene.

[0048] Among them, the waterproof sheet 131 is a membrane-like structure. By adjusting the pore size of the waterproof sheet 131, the effect of waterproofing but allowing organic matter to pass through can be achieved, preventing the electrolyte in the battery cell from leaking from the explosion-proof valve when the pressure is released, thereby improving the reliability and safety of the battery.

[0049] In some embodiments, the thickness of the water barrier 131 is 0.5 to 3 mm. The thickness of the water barrier 131 can be, but is not limited to, 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, or 3.0 mm. If the thickness of the water barrier 131 is less than 0.5 mm, the water barrier 131 may not provide adequate water-blocking performance. Furthermore, the water barrier 131 may be too thin and easily break during degassing. If the thickness of the water barrier 131 is greater than 3 mm, degassing may be hindered.

[0050] In some embodiments, the oil separator 140 includes at least one oil separator 141 disposed at intervals, and at least one third groove 116 is provided on the cavity wall of the communicating cavity 112 . The edge of an oil separator 141 is correspondingly engaged in a third groove 116 .

[0051] In this embodiment, there is one oil separator 141 and one third groove 116. This facilitates the rapid discharge of gas generated within the battery cell. In other embodiments, the number of oil separators 141 can be two, three, or four, depending on the needs.

[0052] The oil separator 141 is made of one of polyamide, polyethersulfone, polyvinylidene fluoride and polytetrafluoroethylene.

[0053] Among them, the oil separator 141 is a membrane structure. By adjusting the pore size of the oil separator 141, it can effectively block the effect of organic matter, prevent the electrolyte in the battery cell from leaking from the explosion-proof valve when the pressure is released, and improve the reliability and safety of the battery.

[0054] In some embodiments, the thickness of the oil separator 141 is 0.3 to 2 mm. The thickness of the oil separator 141 can be, but is not limited to, 0.3 mm, 0.5 mm, 1.0 mm, 1.5 mm, or 2.0 mm. If the thickness of the oil separator 141 is less than 0.3 mm, the water barrier effect of the oil separator 141 is poor, and the oil separator 141 is too thin and easily breaks during degassing. If the thickness of the oil separator 141 is greater than 2 mm, degassing is hindered.

[0055] In some embodiments, an external thread 117 is provided on the outside of the valve body 110 to achieve a detachable connection between the valve body 110 and the battery top cover.

[0056] It is understandable that a detachable connection can also be achieved by providing a through hole on the battery top cover and having an interference fit between the outer side of the valve body 110 and the through hole.

[0057] It is understandable that a detachable connection can also be achieved by providing a protruding structure on the outside of the valve body 110 and providing a recessed structure on the battery top cover that cooperates with the protruding structure.

[0058] The embodiment of the present application further provides a battery cell, comprising the battery explosion-proof valve 100 and a top cover in any of the above embodiments. The explosion-proof valve and the top cover are detachably connected, so that the explosion-proof valve is easily replaced, thereby improving the safety and reliability of the battery cell.

[0059] When the pressure inside and outside the valve body 110 is equal, the gas generated by the battery cell is discharged in sequence through the air inlet 113, the connecting cavity 112 and the exhaust port 111, and the pressure is safely released. Water vapor and dust in the external air cannot enter the battery cell, and the battery cell is safe and reliable.

[0060] When the pressure inside the valve body 110 is higher than that outside, the gas generated by the battery cell is still discharged in sequence through the air inlet 113, the connecting cavity 112 and the exhaust port 111 to safely release the pressure. The water in the electrolyte in the battery cell is blocked by the water barrier 131, and the organic matter is blocked by the oil barrier 141, preventing the electrolyte in the battery cell from leaking out of the valve body 110 and causing a safety accident.

[0061] The present application also provides a battery, including the battery explosion-proof valve 100 in any of the above embodiments or the battery in any of the above embodiments. Therefore, the battery has all the beneficial effects of the battery explosion-proof valve 100 or the battery in any of the above embodiments, which will not be described in detail here.

[0062] The battery can be used in scenarios such as outdoor mobile power supplies, home energy storage devices, or new energy power devices.

[0063] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0064] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A battery explosion-proof valve, characterized in that: include: A valve body, wherein an exhaust port is formed at an end of the valve body, a communication cavity is formed inside the valve body, and an opening of the communication cavity forms an air inlet of the valve body; a dehumidifying element, disposed in the communicating cavity and connected to the valve body, the dehumidifying element being disposed near the exhaust port; a water barrier disposed in the communicating cavity and connected to the valve body, the water barrier being disposed close to the air inlet; An oil separator is provided in the communicating cavity and is connected to the valve body. The oil separator is provided between the dehumidifying component and the water separator, and is spaced apart from the dehumidifying component and the water separator respectively.

2. The battery explosion-proof valve according to claim 1, characterized in that: The dehumidifying element includes at least one dehumidifying sheet arranged at intervals. The cavity wall of the communicating cavity is provided with at least one first groove. The edge of one of the dehumidifying sheets is correspondingly engaged in one of the first grooves.

3. The battery explosion-proof valve according to claim 2, characterized in that: The thickness of the dehumidifying sheet is 0.5 to 3 mm.

4. The battery explosion-proof valve according to claim 1, characterized in that: The water-blocking member includes at least one water-blocking sheet arranged at intervals, and the cavity wall of the communicating cavity is provided with at least one second groove, and the edge of one of the water-blocking sheets is correspondingly engaged in one of the second grooves.

5. The battery explosion-proof valve according to claim 4, characterized in that: The thickness of the water-blocking sheet is 0.5 to 3 mm.

6. The battery explosion-proof valve according to claim 1, characterized in that: The oil separator includes at least one oil separator sheet arranged at intervals, and the cavity wall of the communicating cavity is provided with at least one third groove, and the edge of one of the oil separator sheets is correspondingly engaged in one of the third grooves.

7. The battery explosion-proof valve according to claim 6, characterized in that: The thickness of the oil separator is 0.3-2 mm.

8. The battery explosion-proof valve according to any one of claims 1 to 7, characterized in that: The outer side of the valve body is provided with external threads.

9. A battery cell, characterized in that: The battery explosion-proof valve and top cover comprise the battery explosion-proof valve and top cover according to any one of claims 1 to 8, wherein the explosion-proof valve and the top cover are detachably connected.

10. A battery, characterized in that: The battery explosion-proof valve according to any one of claims 1 to 8 or the battery according to claim 9.

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