Breather valve and battery pack

Abstract

This application relates to a breather valve and a battery pack. The breather valve is used to install into a housing of a battery pack, the housing having an internal cavity for accommodating battery modules. The breather valve includes: an air passage comprising a first channel segment and a second channel segment, the second channel segment being connected in series outside the first channel segment; a desiccant disposed in the first channel segment; and a valve plate assembly disposed in the second channel segment and configured to: be in a closed state when the air pressure in the internal cavity is equal to the air pressure of the external environment, thereby cutting off the second channel segment; and be in an open state when the air pressure in the internal cavity is higher or lower than the air pressure of the external environment, thereby opening the second channel segment.

Description

[0001] This application is a divisional application filed on August 3, 2023, with application number 202310969983.9, entitled "Battery Pack and Breathing Valve for Battery Pack", the full contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of new energy technology, specifically to a breathing valve and a battery pack. Background Technology

[0003] A battery pack provided by related technology includes a housing and battery modules housed within the housing. However, such a battery pack may pose a safety hazard due to moisture. Specifically, when temperature changes inside and outside the housing cause humid air to enter the housing, condensation may occur inside due to the presence of a cooling system or due to temperature drops. This condensation may cause short circuits in the battery modules and electronic components within the housing, leading to safety issues. Summary of the Invention

[0004] In view of this, this application proposes a battery pack and a breather valve for the battery pack.

[0005] In a first aspect, this application proposes a battery pack, comprising: The box-shaped enclosure has an internal cavity. The battery module is housed within the cavity; A breathing valve, installed in the housing, is used to selectively connect the inner cavity to the external environment or block the gas phase. The breathing valve is characterized in that it comprises: An air passage includes a first passage segment and a second passage segment, wherein the second passage segment is connected in series to the outside of the first passage segment; Desiccant is disposed in the first channel section; A valve assembly is disposed in the second channel segment and is configured such that: when the air pressure in the inner cavity is equal to the air pressure of the external environment, it is in a closed state, thereby cutting off the second channel segment; and when the air pressure in the inner cavity is higher or lower than the air pressure of the external environment, it is in an open state, thereby opening the second channel segment.

[0006] In some possible implementations, the valve assembly includes: The first valve plate is elastically deformable and has a through first air outlet; The second valve plate is elastically deformable and has a through second air outlet; A partition is disposed between the first valve plate and the second valve plate, and has an inner surface, an outer surface opposite to the inner surface, a third vent hole and a fourth vent hole that extend from the inner surface to the outer surface and are spaced apart from each other. In the initial state, the first valve plate presses against the inner surface, thereby blocking the fourth vent hole; the second valve plate presses against the outer surface, thereby blocking the third vent hole; and the first vent hole communicates with the third vent hole, while the second vent hole communicates with the fourth vent hole. When the air pressure inside the cavity is lower than the air pressure of the external environment, the first valve plate undergoes elastic deformation towards the inward side under the action of air pressure, thereby forming a first ventilation gap between the first valve plate and the inner surface. This allows the first valve plate to release the blockage of the fourth vent hole and allows the fourth vent hole to communicate with the first vent hole through the first ventilation gap. When the air pressure in the inner cavity is higher than the air pressure in the external environment, the second valve plate undergoes elastic deformation towards the outside under the action of air pressure, thereby forming a second ventilation gap between the second valve plate and the outer surface. This allows the second valve plate to release the blockage of the fourth vent hole and allows the third vent hole to communicate with the second vent hole through the second ventilation gap.

[0007] In some possible implementations, both the first valve plate and the second valve plate are made of silicone.

[0008] In some possible implementations, the valve assembly further includes: The first pressure plate is stacked on the inner side of the first valve plate and applies a pressing force toward the inner surface of the first valve plate; The second pressure plate is stacked on the outside of the second valve plate and applies a pressing force toward the outer surface of the second valve plate.

[0009] In some possible implementations, the valve assembly further includes: A tensioning element is disposed through the first pressure plate, the first valve plate, the partition plate, the second valve plate, and the second pressure plate, and applies a tensioning force to bring the first pressure plate and the second pressure plate closer to each other in the inward and outward directions.

[0010] In some possible implementations, the first tablet has a plurality of through first holes, and the second tablet has a plurality of through second holes; When viewed along a direction perpendicular to the partition, a portion of the first hole, a portion of the second hole, the first vent hole, and the third vent hole overlap; another portion of the first hole, another portion of the second hole, the second vent hole, and the fourth vent hole overlap; the third vent hole is completely covered by the second valve plate; the fourth vent hole is completely covered by the first valve plate; each of the first and third vent holes is separated from each of the second and fourth vent holes.

[0011] In some possible implementations, the first valve plate has a first protrusion protruding outward and inserted into the fourth vent hole, and the second valve plate has a second protrusion protruding inward and inserted into the third vent hole.

[0012] In some possible implementations, the first valve plate is in the shape of a first circle formed by two first semicircles, and the second valve plate is in the shape of a second circle formed by two second semicircles. The first vent hole and the first protrusion are respectively disposed on the two first semicircles, and the second vent hole and the second protrusion are respectively disposed on the two second semicircles. When viewed along a direction perpendicular to the partition, the first semicircle with the first vent hole and the second semicircle with the second protrusion completely overlap each other, and the first semicircle with the protrusion and the second semicircle with the second vent hole completely overlap each other.

[0013] In some possible implementations, the breather valve further includes: Two filter elements are disposed in the air channel, and are located on the inside and outside of the desiccant, respectively.

[0014] Secondly, this application proposes a breather valve for mounting to a battery pack housing, the housing having an internal cavity for accommodating a battery module, the breather valve comprising: An air passage includes a first passage segment and a second passage segment, wherein the second passage segment is connected in series to the outside of the first passage segment; Desiccant is disposed in the first channel section; A valve assembly is disposed in the second channel segment and is configured such that: when the air pressure in the inner cavity is equal to the air pressure of the external environment, it is in a closed state, thereby cutting off the second channel segment; and when the air pressure in the inner cavity is higher or lower than the air pressure of the external environment, it is in an open state, thereby opening the second channel segment.

[0015] The battery pack provided in this application includes: a housing with an inner cavity, a battery module housed within the inner cavity, and a breather valve installed on the housing. The breather valve is used to selectively connect or block the inner cavity from the external environment. The breather valve includes: an air passage comprising a first channel segment and a second channel segment, the second channel segment being connected in series outside the first channel segment; a desiccant disposed in the first channel segment; and a valve assembly disposed in the second channel segment, configured such that: when the air pressure in the inner cavity is equal to the air pressure in the external environment, it is in a closed state, thereby cutting off the second channel segment; and when the air pressure in the inner cavity is higher or lower than the air pressure in the external environment, it is in an open state, thereby opening the second channel segment. Thus, on the one hand, the desiccant in the breather valve can dehumidify the air entering the housing; on the other hand, the air discharged from the housing can carry away moisture from the desiccant in the breather valve, extending the desiccant's service life; furthermore, when the air pressure inside and outside the housing is relatively balanced, ambient air cannot enter the housing, and the desiccant does not ineffectively absorb moisture, thus maintaining its moisture absorption capacity. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this application, and are not intended to limit this application.

[0017] Figure 1 This is a three-dimensional schematic diagram of the battery pack in the embodiments of this application.

[0018] Figure 2 This is a top-view perspective view of the battery pack in an embodiment of this application.

[0019] Figure 3 This is an exploded view of the battery pack after some of its structure has been removed in an embodiment of this application.

[0020] Figure 4 yes Figure 3 A schematic diagram of the structure after the middle part of the structure has been removed.

[0021] Figure 5 yes Figure 4 A magnified view of a portion of the image.

[0022] Explanation of reference numerals in the attached figures: 100 - Box body, 200 - Battery module, 300 - Breathing valve; 1-Air passage, 1A-First passage section, 1B-Second passage section; 2-Desiccant; 3-First valve plate, 3A-First vent hole, 3B-First protrusion; 4-Second valve plate, 4A-Second vent hole; 5-partition, 5A-inner surface, 5B-outer surface, 5C-third vent, 5D-fourth vent; 6 - First tablet compression, 6A - First hole; 7-Second tablet compression, 7A-Second hole; 8- Bolts; 9-Nut; 10-Filter sheet; 11- Circular slot; 12-Metal baffle; 13-Snap ring. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the described embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. It is understood that, without conflict, some technical means of the various embodiments described herein can be substituted for or combined with each other.

[0024] In the description of this application, the terms "first," "second," etc., are used only to distinguish the described objects and have no sequential or technical meaning. Therefore, objects specified with "first," "second," etc., may explicitly or implicitly include one or more of those objects. Furthermore, the words "one" or "a" do not indicate a quantity limitation, but rather indicate the presence of at least one, while "multiple" indicates at least two.

[0025] Figures 1 to 5 A specific embodiment of the battery pack of this application is shown. The battery pack includes a housing 100, a battery module 200, and a breather valve 300. The housing 100 is square in shape and has a generally square internal cavity. The battery module 200 is housed in the internal cavity of the housing 100, and the battery module 200 may be composed of multiple electrically connected battery cells. The breather valve 300 is installed to the housing 100 for selectively connecting or blocking the aforementioned internal cavity from the external environment. In the description of this application, in the extension direction of the air passage 1 (i.e., in the airflow direction within the air passage 1), the direction away from the internal cavity is defined as the outer direction, and the direction closer to the internal cavity is defined as the inner direction.

[0026] The housing 100 may consist of a housing body with an opening and a cover that closes the opening, with the aforementioned inner cavity formed between the housing body and the cover. The breather valve 300 may be installed on the housing body or on the cover.

[0027] The breather valve 300 includes a valve body, an air passage 1, a desiccant 2, and a valve plate assembly.

[0028] The valve body defines the housing of the breather valve 300, or in other words, the valve body includes the housing of the breather valve 300.

[0029] An air passage 1 is formed within the valve body to allow airflow, enabling air to flow between the aforementioned inner cavity and the external environment when the breathing valve 300 is open (correspondingly, the air passage 1 is in a conductive state). The air passage 1 includes a first passage segment 1A and a second passage segment 1B, with the second passage segment 1B connected in series outside the first passage segment 1A. Thus, when the breathing valve 300 is open, air flowing out of the inner cavity first passes through the first passage segment 1A, then through the second passage segment 1B to reach the external environment, while air flowing in from the external environment first passes through the second passage segment 1B, then through the first passage segment 1A to reach the inner cavity.

[0030] Desiccant 2 is disposed in the first channel section 1A, and the valve assembly is disposed in the second channel section 1B. The valve assembly is configured such that: when the air pressure inside the cavity is equal to the air pressure of the external environment, it is in a closed state, thereby cutting off the second channel section 1B; when the air pressure inside the cavity is higher or lower than the air pressure of the external environment, it is in an open state, thereby opening the second channel section 1B. Thus, when the valve assembly is in the closed state and the second channel is cut off, moisture-laden air from the external environment cannot contact the desiccant 2 inside the valve assembly, thereby preventing the desiccant 2 from ineffectively absorbing moisture and extending its service life. The amount of desiccant 2 can be selected according to the size of the battery pack and the required service life.

[0031] The valve plate assembly includes a partition 5, a first valve plate 3, and a second valve plate 4, with the first valve plate 3 and the second valve plate 4 located on the inner and outer sides of the partition 5, respectively.

[0032] The baffle 5 is integrally formed on the valve body and has an inner surface 5A, an outer surface 5B opposite to the inner surface 5A, and a third vent 5C and a fourth vent 5D that extend from the inner surface 5A to the outer surface 5B and are spaced apart from each other. In this embodiment, the third vent 5C and the fourth vent 5D are both arc-shaped elongated holes, and they are arranged on the same circumference.

[0033] The first valve plate 3 is elastically deformable and has a through first vent hole 3A. The second valve plate 4 is also elastically deformable and has a through second vent hole 4A.

[0034] In this embodiment, multiple first vent holes 3A and multiple second vent holes 4A are provided. The multiple first vent holes 3A are arranged in an arc shape, and the multiple second vent holes 4A are arranged in another arc shape. The two arc shapes are coaxial and located on opposite radial sides of the axis. Obviously, only one first vent hole 3A and one second vent hole 4A can be provided.

[0035] In the initial state, the air pressure in the inner cavity is equal to the air pressure of the external environment. The first valve plate 3 presses against the inner surface 5A of the partition plate 5, thereby blocking the fourth vent 5D (more specifically, the inner opening of the fourth vent 5D, that is, the opening of the fourth vent at the inner surface 5A). The second valve plate 4 presses against the outer surface 5B of the partition plate 5, thereby blocking the third vent 5C (more specifically, the outer opening of the third vent 5C, that is, the opening of the third vent at the outer surface 5B). The first vent 3A is connected to the third vent 5C, and the second vent 4A is connected to the fourth vent 5D.

[0036] When the air pressure inside the cavity is lower than the air pressure in the external environment, the first valve plate 3 undergoes elastic deformation towards the inward side under the action of air pressure, thereby forming a first ventilation gap between the first valve plate 3 and the inner surface 5A. This allows the first valve plate 3 to release the blockage of the fourth vent hole 5D and connect the fourth vent hole 5D with the first vent hole 3A through the first ventilation gap. Specifically, the air pressure inside the cavity is applied to the inner side of the first valve plate 3 through the first channel section 1A, and the air pressure in the external environment is applied to the outer side of the first valve plate 3 through the second vent hole 4A of the second valve plate 4 and the fourth vent hole 5D of the partition 5. Since the air pressure inside the cavity is lower than the air pressure in the external environment, there is an air pressure difference between the inner and outer sides of the first valve plate 3, which causes the first valve plate 3 to elastically deform towards the inward side. As a result, the outer side of the first valve plate 3 that originally blocked the fourth vent hole 5D leaves the fourth vent hole 5D, releasing the blockage and forming a first ventilation gap between the first valve plate 3 and the inner surface 5A. In this way, air from the external environment can pass through the fourth air vent 5D of the partition 5, the first ventilation gap, the first air vent 3A of the first valve plate 3, and the first channel section 1A with desiccant 2 in sequence, and enter the inner cavity of the box 100 after being dried and absorbing moisture by the desiccant 2.

[0037] When the air pressure inside the cavity is higher than the air pressure outside the cavity, the second valve plate 4 undergoes elastic deformation outward under the action of air pressure, thereby forming a second venting gap between the second valve plate 4 and the outer surface 5B. This allows the second valve plate 4 to release the blockage of the fourth vent hole 5D and connects the third vent hole 5C with the second vent hole 4A through the second venting gap. Specifically, the air pressure of the external environment is applied to the outer surface of the second valve plate 4, while the air pressure inside the cavity is applied to the inner surface of the second valve plate 4 through the first vent hole 3A of the first valve plate 3 and the third vent hole 5C of the partition 5. Because the air pressure inside the cavity is higher than the air pressure outside the cavity, there is an air pressure difference between the inner and outer surfaces of the second valve plate 4, causing the second valve plate 4 to elastically deform outward. As a result, the inner surface of the second valve plate 4 that originally blocked the third vent hole 5C moves away from the third vent hole 5C, releasing the blockage and forming a second venting gap between the second valve plate 4 and the outer surface 5B. In this way, the air in the inner cavity can sequentially enter the inner cavity of the housing 100 through the first vent 3A of the first valve plate 3, the third vent 5C of the partition 5, the second ventilation gap, the second vent 4A of the second valve plate 4, and the first channel section 1A containing the desiccant 2. During this process, when the dry air in the inner cavity passes through the desiccant 2 in the first channel section 1A, it can carry away some of the moisture in the desiccant 2—desorbing the moisture in the desiccant 2, thereby helping to extend the service life of the desiccant 2.

[0038] In this embodiment, both the first valve plate 3 and the second valve plate 4 are made of silicone, that is, both are relatively soft and elastic silicone sheets.

[0039] The valve plate assembly also includes a first pressure plate 6 and a second pressure plate 7. The first pressure plate 6 is stacked inside the first valve plate 3 and applies a slight pressing force to the first valve plate 3 toward its inner surface 5A. The second pressure plate 7 is stacked outside the second valve plate 4 and applies a slight pressing force to the second valve plate 4 toward its outer surface 5B.

[0040] In this embodiment, both the first pressing plate 6 and the second pressing plate 7 are made of metal, that is, both are metal sheets. In other embodiments, the first pressing plate 6 and the second pressing plate 7 are made of plastic.

[0041] Furthermore, the valve plate assembly also includes a tensioning element comprising a bolt 8 and a nut 9. The head of the bolt 8 passes sequentially from the outside in through the second pressure plate 7, the second valve plate 4, the partition 5, the first valve plate 3, and the first pressure plate 6, before engaging with the nut 9. Thus, the tensioning element holds the second pressure plate 7, the second valve plate 4, the partition 5, the first valve plate 3, and the first pressure plate 6 together, and the silicone-material first valve plate 3 and the second valve plate 4 are in a non-natural state of compression and collapse deformation. Therefore, to resist the elastic force that allows the first valve plate 3 and the second valve plate 4 to recover their deformation, the bolt 8 and nut 9 assembly applies a tensioning force to the first pressure plate 6 and the second pressure plate 7, intending to bring them closer together in the inward and outward directions. Consequently, the first pressure plate 6 presses the first valve plate 3 outward, and the second pressure plate 7 presses the second valve plate 4 inward.

[0042] The first pressure plate 6 has multiple through holes 6A, which are evenly and densely distributed across the entire area of ​​the first pressure plate 6. The second pressure plate 7 has multiple through holes 7A, which are densely distributed across the entire area of ​​the second pressure plate 7. Thus, during assembly, regardless of the angle at which the first pressure plate 6 and the second pressure plate 7 are positioned, there will always be a corresponding first hole 6A overlapping with the first vent hole 3A on the first valve plate 3, and there will always be a corresponding second hole 7A overlapping with the second vent hole 4A on the second valve plate 4. This prevents the first pressure plate 6 from cutting off the gas phase from the inner cavity to the first vent hole 3A, and prevents the second pressure plate 7 from cutting off the gas phase from the external environment to the second vent hole 4A.

[0043] Specifically, when viewed along a direction perpendicular to the partition 5, a portion of the first hole 6A, a portion of the second hole 7A, the first vent 3A, and the third vent 5C overlap, while another portion of the first hole 6A, another portion of the second hole 7A, the second vent 4A, and the fourth vent 5D overlap. The third vent 5C is completely covered by the second valve plate 4, and the fourth vent 5D is completely covered by the first valve plate 3. Each of the first vent 3A and the third vent 5C is separated from each of the second vent 4A and the fourth vent 5D.

[0044] It is understandable that the densely packed first holes 6A on the first pressure plate 6 provide inward deformation space for the first valve plate 3. This allows the first valve plate 3 to easily undergo inward elastic deformation when the ambient air pressure is greater than the internal air pressure, thus ensuring the smooth opening of the air passage 1. Similarly, the densely packed second holes 7A on the second pressure plate 7 provide outward deformation space for the second valve plate 4. This allows the second valve plate 4 to easily undergo outward elastic deformation when the internal air pressure is greater than the ambient air pressure, thus ensuring the smooth opening of the air passage 1 of the breathing valve 300.

[0045] Furthermore, the first valve plate 3 has a first protrusion 3B protruding outward, which is inserted into the fourth vent hole 5D. The second valve plate 4 has a second protrusion (not shown) protruding inward, which is inserted into the third vent hole 5C. Thus, the third vent hole 5C and the fourth vent hole 5D not only provide ventilation but also position the assembly angles of the first valve plate 3 and the second valve plate 4. In addition, when the first valve plate 3 and the second valve plate 4 deform due to air pressure, the protruding first protrusion 3B and the second protrusion will not completely detach from the fourth vent hole 5D and the third vent hole 5C. This prevents changes in the angular position of the first valve plate 3 and the second valve plate 4 relative to the partition 5, which could lead to the first vent hole 3A completely misaligning with the third vent hole 5C, and the second vent hole 4A completely misaligning with the fourth vent hole 5D, thereby preventing the breather valve 300 from opening successfully.

[0046] The first valve plate 3 is shaped like a first circle formed by two first semicircles, and the second valve plate 4 is shaped like a second circle formed by two second semicircles. A first vent 3A and a first protrusion 3B are respectively disposed on the two first semicircles, and a second vent 4A and a second protrusion are respectively disposed on the two second semicircles. When viewed along a direction perpendicular to the partition 5, the first semicircle with the first vent 3A and the second semicircle with the second protrusion completely overlap each other, and the first semicircle with the protrusion and the second semicircle with the second vent 3A completely overlap each other.

[0047] In addition, to prevent the desiccant 2 and dust from the environment from entering the inner cavity of the housing 100, this embodiment also provides three filter sheets 10 in the air channel 1. Two of the filter sheets 10 are located inside and outside the desiccant 2, respectively (that is, these two filter sheets 10 are arranged in the extending direction of the air channel 1 with the desiccant 2 in between), and the other filter sheet 10 is located outside the second valve plate 4. The filter sheet 10 is specifically made of non-woven fabric.

[0048] Specifically, three annular slots 11 are formed on the inner wall of the air channel 1, spaced apart from the inside out. A metal baffle 12 with mesh and a non-woven fabric serving as a filter 10 are stacked together and engaged in the annular slots 11 by a retaining spring 13. More specifically, the retaining spring 13 engages the metal baffle 12 and the filter 10 into the annular slots 11 on the side of the filter 10 facing away from the metal baffle 12, and the filter 10 is sandwiched between the retaining spring 13 and the metal baffle 12.

[0049] In addition, a desiccant 2 is placed inside the battery pack housing 100 to absorb moisture from the air entering the housing. This desiccant 2 can be packaged in flame-retardant PET or PP material with slow-permeability, and the package is fixed to the inner wall of the housing 100 with strong double-sided adhesive. The desiccant 2 inside the housing 100 can be a combination of magnesium chloride and magnesium hydroxide reactive desiccant 2, eliminating the risk of secondary moisture reabsorption.

[0050] Additionally, the bottom of the housing 100 is lined with absorbent nonwoven fabric (not shown) to absorb moisture in the interior of the housing 100—such as battery fluid leaking from the battery module 200. The absorbent nonwoven fabric may include an upper absorbent layer and a leak-proof layer laminated below the absorbent layer, wherein the leak-proof layer may be a flame-retardant PET film.

Claims

1. A breather valve for mounting to a housing of a battery pack, the housing having an internal cavity for receiving a battery module, characterized in that, The breathing valve includes: An air passage includes a first passage segment and a second passage segment, wherein the second passage segment is connected in series to the outside of the first passage segment; Desiccant is disposed in the first channel section; A valve plate assembly, disposed in the second channel segment, includes: The first valve plate is elastically deformable and has a through first air outlet; The second valve plate is elastically deformable and has a through second air outlet; A partition is disposed between the first valve plate and the second valve plate, and has an inner surface, an outer surface opposite to the inner surface, a third vent hole and a fourth vent hole that extend from the inner surface to the outer surface and are spaced apart from each other. In the initial state, the first valve plate presses against the inner surface, thereby blocking the fourth vent hole; the second valve plate presses against the outer surface, thereby blocking the third vent hole; and the first vent hole communicates with the third vent hole, while the second vent hole communicates with the fourth vent hole. When the air pressure inside the cavity is lower than the air pressure of the external environment, the first valve plate undergoes elastic deformation towards the inward side under the action of air pressure, thereby forming a first ventilation gap between the first valve plate and the inner surface. This allows the first valve plate to release the blockage of the fourth vent hole and allows the fourth vent hole to communicate with the first vent hole through the first ventilation gap. When the air pressure in the inner cavity is higher than the air pressure in the external environment, the second valve plate undergoes elastic deformation towards the outside under the action of air pressure, thereby forming a second ventilation gap between the second valve plate and the outer surface. This allows the second valve plate to release the blockage of the fourth vent hole and allows the third vent hole to communicate with the second vent hole through the second ventilation gap.

2. The breathing valve according to claim 1, characterized in that, Both the first valve plate and the second valve plate are made of silicone.

3. The breathing valve according to claim 1 or 2, characterized in that, The valve assembly also includes: The first pressure plate is stacked on the inner side of the first valve plate and applies a pressing force toward the inner surface of the first valve plate; The second pressure plate is stacked on the outside of the second valve plate and applies a pressing force toward the outer surface of the second valve plate.

4. The breathing valve according to claim 3, characterized in that, The valve assembly also includes: A tensioning element is disposed through the first pressure plate, the first valve plate, the partition plate, the second valve plate, and the second pressure plate, and applies a tensioning force to bring the first pressure plate and the second pressure plate closer to each other in the inward and outward directions.

5. The breathing valve according to claim 3, characterized in that, The first tablet has a plurality of through first holes, and the second tablet has a plurality of through second holes; When viewed along a direction perpendicular to the partition, a portion of the first hole, a portion of the second hole, the first vent hole, and the third vent hole overlap; another portion of the first hole, another portion of the second hole, the second vent hole, and the fourth vent hole overlap; the third vent hole is completely covered by the second valve plate; the fourth vent hole is completely covered by the first valve plate; each of the first and third vent holes is separated from each of the second and fourth vent holes.

6. The breathing valve according to claim 1, characterized in that, The first valve plate has a first protrusion protruding outward, which is inserted into the fourth vent hole. The second valve plate has a second protrusion protruding inward, which is inserted into the third vent hole.

7. The breathing valve according to claim 6, characterized in that, The first valve plate is in the shape of a first circle formed by two first semicircles, and the second valve plate is in the shape of a second circle formed by two second semicircles. The first vent hole and the first protrusion are respectively disposed on the two first semicircles, and the second vent hole and the second protrusion are respectively disposed on the two second semicircles. When viewed along a direction perpendicular to the partition, the first semicircle with the first vent hole and the second semicircle with the second protrusion completely overlap each other.

8. The breathing valve according to claim 1, characterized in that, The breathing valve also includes: Two filter elements are disposed in the air channel, and are located on the inside and outside of the desiccant, respectively.

9. A battery pack, characterized in that, Includes the breathing valve as described in any one of claims 1 to 8.

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