Purification device

Abstract

This invention provides a technology for suppressing the occurrence of short paths caused by the miniaturization of granular purifying material in a gas purification device that purifies gases generated by secondary batteries. [Solution] The purification device comprises a purifying material, an elastic member, and a housing member. The purifying material is granular and purifies gas. The housing member is arranged on the outside of the battery case that houses the secondary battery, connected to the battery case. The housing member houses the purifying material and forms a flow path for gas flowing out of the battery case. The housing member has a filling section and an arrangement section. The filling section is the part of the flow path that is filled with the purifying material. The arrangement section is adjacent to the filling section and is the part where the elastic member is arranged. The elastic member is arranged to press against the purifying material.

Description

Technical Field

[0001] The present disclosure relates to a purification device for purifying gas generated in a secondary battery.

Background Art

[0002] There is a purification device for purifying gas generated in a secondary battery. For example, Patent Document 1 discloses a configuration in which a removal unit for detoxifying gas is arranged inside a pipe through which gas generated in a secondary battery passes.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a purification device in which a purification material for purifying gas generated in a secondary battery is filled in a gas flow path, granular purification material may be used. However, the granular purification material can be made finer by vibration or the like. When the granular purification material is made finer, voids occur in the purification material layer, and there is a possibility that a short path may occur in which gas is discharged to the outside without contacting the purification material.

[0005] One aspect of the present disclosure provides a technique for suppressing the occurrence of a short path caused by the refinement of granular purification material in a purification device for purifying gas generated in a secondary battery.

Means for Solving the Problems

[0006] One aspect of the present disclosure is a purification device for purifying gas generated in a secondary battery. The purification device includes a purification material, an elastic member, and a housing member. The purification material is granular and purifies gas. The housing member is positioned on the outside of the battery case that houses the secondary battery, connected to the battery case. The housing member also houses the purifying material and forms a passage for gas flowing out of the battery case. The housing member also has a filling section and an arrangement section.

[0007] The filling section is the part of the flow path where the purification material is filled. The placement section is adjacent to the filling section and is where the elastic member is placed. The elastic member is positioned to press against the purification material. With this configuration, the purifying material is compressed, which suppresses wear and noise caused by vibration. Furthermore, even if the purifying material becomes finer, it is possible to suppress the formation of voids within the material. Therefore, it is possible to suppress the occurrence of short paths caused by the finening of granular purifying material.

[0008] In one aspect of this disclosure, the housing member may include an engaging portion configured to detachably engage with an engaging portion located in a battery case. With this configuration, the housing components can be easily attached to and detached from the battery case. Therefore, the purifying material can be easily replaced.

[0009] In one aspect of this disclosure, the engaging portion and the engaged portion may be configured to become engaged by rotating relative to each other. With this configuration, the engaging portion and the engaged portion can be easily attached and detached.

[0010] In one aspect of this disclosure, the engaging portion and the engaged portion may be provided with threaded portions that can engage with each other. With such a configuration, the parts can be firmly fixed by the threaded portions and can be easily attached and detached.

[0011] In one aspect of this disclosure, the elastic member may be configured to be compressed toward the purifying material by the engaged portion when the engaging portion engages with the engaged portion. With this configuration, the elastic member is compressed more when the housing member is installed in the battery case, allowing the purifying material to apply appropriate pressure.

[0012] In one aspect of this disclosure, the elastic member may be provided with a plate material connected to the end on the purifying material side and the end on the engaged portion side, allowing gas to communicate between them. In this case, the plate material on the engaged portion side may have a contact surface larger than the gas flow path in the engaged portion, and the elastic member may be compressed toward the purifying material side when the contact surface and the engaged portion come into contact. With this configuration, an appropriate pressing force can be applied to the purifying material using a plate. [Brief explanation of the drawing]

[0013] [Figure 1] This is a cross-sectional view showing a battery system according to an embodiment. [Figure 2] Figure 2A is a cross-sectional view showing the engaged portion of the embodiment, and Figure 2B is a cross-sectional view showing the engaging portion of the embodiment. [Figure 3] Figure 3A is a side view showing the structure of the elastic member, and Figure 3B is a plan view showing the ventilation plate. [Figure 4] Figure 4A is a cross-sectional view of the battery system of the first modified example, and Figure 4B is a cross-sectional view of the battery system of the second modified example. [Figure 5] Figure 5A is a cross-sectional view showing the protruding member of the battery system of the third modified example, and Figure 5B is a cross-sectional view of VB-VB in Figure 5A. [Figure 6] Figure 6A is a cross-sectional view showing the battery system of the fourth modified example, and Figure 6B is a cross-sectional view showing the engaging and engaged parts configured as a snap-fit ​​structure. [Figure 7] Figure 7A is a cross-sectional view showing the engaged portion of the fourth modified example, Figure 7B is a cross-sectional view from VIIB-VIIB in Figure 7A, and Figure 7C is a cross-sectional view from VIIC-VIIC in Figure 7B. [Figure 8] Figure 8A is a cross-sectional view showing the engagement portion of the fourth modified example, Figure 8B is a cross-sectional view of VIIIB-VIIIB in Figure 8A, and Figure 8C is a cross-sectional view of VIIIC-VIIIC in Figure 8B. [Figure 9] Figure 9A is a cross-sectional view showing the battery system of the fifth modified example, and Figure 9B is a plan view showing the rotating engagement part. [Figure 10]FIG. 10A is a cross-sectional view showing a battery system according to a sixth modification, and FIG. 10B is a cross-sectional view showing an engaging portion and an engaged portion configured as a press-fitting structure.

Embodiments for Carrying Out the Invention

[0014] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings. [1. Embodiment] [1-1. Configuration] The battery system 100 shown in FIG. 1 is mounted on a vehicle such as an electric vehicle. The vertical direction and the horizontal direction in the following description mean the vertical direction and the horizontal direction in a state where the battery system 100 is mounted on the vehicle. The battery system 100 includes an outer shell member 1, a secondary battery 2, and a purification device 3.

[0015] The outer shell member 1 is a member that forms an accommodation space 11 for accommodating the secondary battery 2. The outer shell member 1 is the battery case of the present disclosure. The outer shape of the outer shell member 1 in the present embodiment is a rectangular parallelepiped shape. As shown in FIGS. 1 and 2A, a communication portion 14 is formed on the outer surface of the outer shell member 1. The communication portion 14 is a space near an opening that communicates the inside and outside of the outer shell member 1, that is, the accommodation space 11 and the outside. The communication portion 14 in the present embodiment is formed on the lower surface of the outer shell member 1.

[0016] The secondary battery 2 is disposed in the accommodation space 11. The secondary battery 2 includes a positive electrode, a negative electrode, and an electrolyte interposed between the positive electrode and the negative electrode. At least one of the positive electrode, the negative electrode, and the electrolyte contains a sulfur-based material. As a specific example of the secondary battery 2, an all-solid-state battery using a sulfide-based solid electrolyte as the electrolyte can be mentioned. The secondary battery 2 supplies power to a motor for driving the vehicle, for example, in a state where the battery system 100 is mounted on the vehicle.

[0017] Gas G is generated from the secondary battery 2. Specifically, when the sulfur-based material reacts with moisture, gas G containing hydrogen sulfide is generated. The purification device 3 is a device that purifies this gas G.

[0018] As shown in Figures 1 and 2B, the purification device 3 comprises a housing member 40, a purification material 70, and an elastic member 80. The purification device 3 may also comprise two ventilation plates 50A and 50B and two filters 60A and 60B.

[0019] The containment member 40 is a member that forms a gas flow path 75 for the gas G. The containment member 40 is cylindrical. In this embodiment, the containment member 40 is, for example, cylindrical with a stepped portion 40C. In the containment member 40, the openings at both ends in the axial direction of the containment member 40 function as an inlet 40A and an outlet 40B, respectively. That is, the containment member 40 has an inlet 40A and an outlet 40B. The inlet 40A is an opening for introducing gas G into the containment member 40. The outlet 40B is an opening for discharging gas G from the containment member 40.

[0020] The housing member 40 is positioned on the outside of the outer shell member 1 and connected to the outer shell member 1. More specifically, the outer shell member 1 has an engaging portion 21A, and the housing member 40 has an engaging portion 41A, configured so that the engaging portion 41A can be detachably engaged with the engaging portion 21A. In other words, the battery system 100 is configured so that the housing member 40 can be easily attached to and detached from the outer shell member 1, and the purifying material 70 inside can be easily replaced.

[0021] More specifically, the engaging portion 41A and the engaged portion 21A are configured as threaded portions that can engage with each other. As shown in Figure 2A, in the outer shell member 1, the engaged portion 21A is formed to protrude downward in a cylindrical shape from the outer shell member 1, and this portion is provided with a male threaded portion 22. The male threaded portion 22 is formed along the outer circumferential surface of the portion that protrudes from the outer shell member 1. On the other hand, as shown in Figure 2B, the engaging portion 41A of the housing member 40 is provided with a female threaded portion 42. The female threaded portion 42 is formed along the inner circumferential surface of the arrangement portion 44 of the housing member 40, which will be described later.

[0022] The male threaded portion 22 and the female threaded portion 42 can be joined together as shown in Figure 1, or separated as shown in Figures 2A and 2B. This configuration allows the engaging portion 41A and the engaged portion 21A to be firmly fixed together, and also allows for easy attachment and detachment.

[0023] A communication portion 14 is located on the inner circumferential surface side of the male threaded portion 22, and a flow path 75 is located on the inner circumferential surface side of the female threaded portion 42. When the male threaded portion 22 and the female threaded portion 42 are hinged together, the communication portion 14 and the flow path 75 communicate while maintaining airtightness. This configuration allows gas G to move into the interior of the housing member 40 without leaking from the communication portion 14.

[0024] Furthermore, as shown in Figure 2A, a communication plate 15 is provided at the lower end of the male screw portion 22 (i.e., the end on the housing member 40 side). The communication plate 15 is fixedly positioned at the lower end of the male screw portion 22 and has the function of allowing gas G to pass through while obstructing the passage of the pressing member 81 (see, for example, Figures 1 and 3A, etc.), which will be described later. The communication plate 15 is made of, for example, a metallic mesh member.

[0025] As shown in Figure 2B, the housing member 40 has a stepped portion 40C as the boundary, with an arrangement portion 44 on the engagement portion 41A side and a filling portion 45 which is the portion other than the arrangement portion 44. The stepped portion 40C is the portion where the diameter of the housing member 40 (i.e., the outer diameter and inner diameter) is changed. The diameter of the arrangement portion 44 is set to be smaller than the diameter of the filling portion 45.

[0026] As shown in Figure 3B, the ventilation plate 50A is a disc-shaped member with a plurality of ventilation holes 51 formed therein. The ventilation plate 50A is positioned so as to be in contact with the stepped portion 40C in the filling portion 45. The ventilation plate 50A is not fixed and can move toward the purifying material 70 in response to the pressing force of the elastic member 80, which will be described later.

[0027] The outer diameter of the ventilation plate 50A is set to be larger than the outer diameter of the placement section 44 and smaller than the outer diameter of the filling section 45. In other words, the ventilation plate 50A cannot move beyond the stepped section 40C towards the placement section 44. The ventilation holes 51 are holes that penetrate the ventilation plate 50A in the thickness direction.

[0028] The arrangement section 44 contains most of the elastic member 80 and a pressing member 81 connected to the elastic member 80. As shown in Figures 1 and 3A, the elastic member 80 is positioned on the outer shell member 1 side (for example, the upper side) of the ventilation plate 50A. The elastic member 80 is a member that biases an object in a predetermined direction by elastic force. A specific example of the elastic member 80 is a coil spring. The first end of the elastic member 80 on the purification material 70 side and the second end on the engaged portion 21A side are connected to plate materials (for example, the ventilation plate 50A and the pressing member 81), respectively.

[0029] The elastic member 80 is positioned inside the housing member 40 so as to press against the purifying material 70 via the ventilation plate 50A and the filter 60A. Specifically, the elastic member 80 is positioned to press against the purifying material 70 from the upstream side of the flow path 75, along the flow direction of the gas G.

[0030] As shown in Figure 3A, the pressing member 81 is fixed to the end of the elastic member 80 opposite to the end where the ventilation plate 50A is provided. For example, the pressing member 81 may have ventilation holes 51 similar to those of the ventilation plates 50A and 50B, thereby providing ventilation. The pressing member 81 comes into contact with the communication plate 15 as the engaging portion 41A (e.g., female screw portion 42) engages with the engaged portion 21A (e.g., male screw portion 22). In this state, as the housing member 40 moves further closer to the outer shell member 1, the elastic member 80 is compressed toward the purifying material 70, as shown in Figure 1. This configuration allows the purifying material 70 to apply an appropriate pressing force. In other words, when the housing member 40 is attached to the outer shell member 1, the pressing force applied by the elastic member 80 is increased compared to before attachment.

[0031] The filling section 45 is the part of the flow path 75 that is filled with the purifying material 70. The filling section 45 contains the purifying material 70, two ventilation plates 50A and 50B, and two filters 60A and 60B.

[0032] For example, as shown in Figure 2B, on the side of the filling section 45 facing the arrangement section 44 (hereinafter referred to as the upper side), the ventilation plate 50A, filter 60A, and purifying material 70 are arranged in order from the top. On the other hand, on the side of the filling section 45 opposite to the arrangement section 44 (hereinafter referred to as the lower side), the filter 60B and ventilation plate 50B are arranged in order from the top. The filter 60B and ventilation plate 50B are positioned at the lower end of the housing member 40 so as to close the opening. The filters 60A and 60B are configured to prevent the purifying material 70 from passing through, while allowing gas containing gas G to pass through. The outer diameter of the filters 60A and 60B is approximately the same as the inner diameter of the filling section 45.

[0033] In the filling section 45, the area sandwiched between the two filters 60A and 60B is densely packed with a purifying material 70. The purifying material 70 has the function of purifying gas G by adsorption or modification. The purifying material 70 is granular. The purifying material 70 forms a purifying material layer when it is packed in the filling section 45. Examples of materials for the purifying material 70 include activated carbon, metal oxides such as alumina, and metal hydroxides such as magnesium hydroxide.

[0034] The gas G generated from the secondary battery 2 is introduced into the placement section 44 through the inlet 40A from the communication section 14, and then enters the filling section 45. While passing through the filling section 45, it is purified by the purification material 70 and discharged to the outside from the outlet 40B.

[0035] [1-3. Effects] The embodiments described in detail above produce the following effects. (1a) In the above embodiment, the filling section 45 of the purification device 3 is filled with a purification material 70. An elastic member 80 is positioned in the arrangement section 44 adjacent to the filling section 45 so as to press against the purification material 70. Since the purification material 70 is granular, it may be further broken down by vibration or the like. However, with the above configuration, even if the purification material 70 is further broken down, the elastic member 80 presses against the purification material 70, preventing the formation of voids in the purification material 70. Therefore, the occurrence of short paths caused by the breaking down of the purification material 70 can be suppressed.

[0036] (1b) The housing member 40 is connected to the outer shell member 1 on the outside of the outer shell member 1. Therefore, when the purification material 70 needs to be replaced, the purification material 70 can be easily replaced.

[0037] (1c) The housing member 40 includes an engaging portion 41A configured to be detachably engaged with the engaged portion 21A located on the outer shell member 1. With this configuration, the housing member 40 can be easily attached to and detached from the outer shell member 1. Therefore, the purification material 70 can be easily replaced.

[0038] (1d) The engaging portion 41A and the engaged portion 21A are equipped with threaded portions (for example, a male threaded portion 22 and a female threaded portion 42) that can engage with each other. With this configuration, the screw portion can be firmly fixed, and it can also be easily attached and detached.

[0039] (1e) The elastic member 80 is configured to be further compressed toward the purifying material 70 by the engaged portion 21A when the engaging portion 41A engages with the engaged portion 21A. With this configuration, when the housing member 40 is attached to the outer shell member 1, the elastic member 80 is compressed more, so that the purifying material 70 can apply an appropriate pressing force.

[0040] [2. Other Embodiments] Although embodiments of the present disclosure have been described above, the present disclosure is not limited to the embodiments described above and can be implemented in various modified forms.

[0041] (2a) In the above embodiment, the purification device 3 is located on the vertically lower side of the outer shell member 1, but is not limited thereto. For example, the purification device 3 may be located on the vertically upper side of the outer shell member 1, as in the first modified battery system 101 shown in Figure 4A, or the purification device 3 may be located on the side of the outer shell member 1, as in the second modified battery system 102 shown in Figure 4B.

[0042] (2b) In the above embodiment, the elastic member 80 was well pressed by the communication plate 15, but is not limited thereto. For example, as in the third modified battery system 103 shown in Figures 5A and 5B, a projection member 16 may be provided instead of the communication plate 15. The projection member 16 comprises an outer portion 16A, a projection portion 16B, and a connecting portion 16C.

[0043] The outer portion 16A is annular in shape, and its outer circumference is positioned to coincide with the inner circumferential surface of the male screw portion 22 of the outer shell member 1, and is fixed to this inner circumferential surface. The projection 16B is positioned to protrude vertically downward from the outer portion 16A. The connecting portion 16C is an arm-shaped portion that connects the outer portion 16A and the projection 16B.

[0044] In this configuration, the projection 16B presses against the elastic member 80, causing the elastic member 80 to be compressed. In this configuration, the pressing member 81 may or may not be provided. Even with such a configuration, the same effects as those of this embodiment can be enjoyed.

[0045] (2c) In the above embodiment, the engaging portion 41A and the engaged portion 21A are provided with a female screw portion 42 and a male screw portion 22, but the embodiment is not limited thereto. For example, as in the fourth modified battery system 104 shown in Figures 6A to 8C, the engaging portion 41B and the engaged portion 21B may be provided as a snap-fit ​​structure.

[0046] As shown in Figures 7A, 7B, and 7C, the engaged portion 21B has two extensions 23 on the outer circumference near the communication portion 14 of the outer shell member 1. Each extension 23 has a main body portion 23A and a projection portion 23B. As shown in Figure 7B, the main body portion 23A is formed to protrude outward along the outer circumference of the outer shell member 1 over a distance of approximately 90 degrees of the entire circumference.

[0047] The projection 23B is a portion formed to protrude downward from the main body 23A. The extension 23 (i.e., the main body 23A and the projection 23B) is formed integrally with the outer shell member 1 as part of the outer shell member 1.

[0048] On the other hand, as shown in Figures 8A, 8B, and 8C, the engaging portion 41B includes a receiving portion 43 as part of the housing member 40, which has a shape corresponding to the extended portion 23. The receiving portion 43 includes a groove 43A, a hole 43B, and a movable portion 43C.

[0049] The groove 43A is a groove-shaped portion formed along the circumferential direction on the inner circumferential surface of the housing member 40. The groove 43A has a shape corresponding to the main body portion 23A of the engaged portion 21B. The hole 43B is a hole located below the groove 43A. The hole 43B is a portion into which the projection 23B can engage.

[0050] The movable part 43C is the part adjacent to the hole 43B. The movable part 43C has enough flexibility to be displaced downward by the height of the projection 23B (i.e., the amount of protrusion from the main body 23A).

[0051] When engaging the engaging portion 41B with the engaged portion 21B, the main body portion 23A of the extension portion 23 is inserted into the groove portion 43A of the receiving portion 43 in the direction of the arrow shown in Figure 6B (for example, from right to left). At this time, the projection portion 23B slides against the movable portion 43C, pushing the movable portion 43C open, until the projection portion 23B fits into the hole portion 43B. At this time, the opened movable portion 43C returns to its original position, and the movable portion 43C obstructs the movement of the projection portion 23B, making it difficult for the extension portion 23 to come out of the receiving portion 43. Even with this configuration, the same effects as the configuration of this embodiment can be enjoyed.

[0052] (2d) Alternatively, the battery system 105 of the fifth modified example shown in Figures 9A and 9B may be provided with an engaging portion 41C and an engaged portion 21C as a rotating engaging portion. As shown in Figure 9A, a groove 17 is formed in the region of the engaged portion 21C (i.e., the outer shell member 1) near the communication portion 14. The groove 17 is a portion of the engaged portion 21C where the material thickness is reduced without penetrating the material. The groove 17 starts from the lower end of the region near the communication portion 14, extends vertically upward, bends 90 degrees, and ends by extending horizontally.

[0053] On the other hand, the engaging portion 41C is equipped with a projection plate 82 instead of the pressing member 81. As shown in Figure 9B, the projection plate 82 comprises a disc-shaped main body portion 82A and a projection portion 82B that protrudes further outward from the outer circumference of the disc.

[0054] When the engaging portion 41C and the engaged portion 21C are engaged, the projection 82B is inserted vertically upward into the groove 17 and, once it has reached the back, the purification device 3 is further rotated, making it difficult for the projection 82B to come out of the groove 17. In this state, the housing member 40 and the engaged portion 21C of the outer shell member 1 may be fixed by some method. For example, the engaged portion 21C may be press-fitted into the engaging portion 41C, and they may be fixed by frictional force. Even with such a configuration, the same effects as the configuration of this embodiment can be enjoyed. In the fifth modified example, the battery system 105 may be configured to have ventilation by providing ventilation holes 51 in the main body portion 82A of the projection plate 82, for example.

[0055] (2e) Alternatively, the battery system 106 of the sixth modified example shown in Figures 10A and 10B may be provided with an engaging portion 41D and a engaged portion 21D as a press-fit structure. As shown in Figure 10B, the engaged portion 21D (i.e., the outer shell member 1) includes a cylindrical member 24 in the region near the communication portion 14, on which an outer peripheral projection 24A is formed. The cylindrical member 24 is made of a material (for example, resin) that can be deformed to the extent that the outer peripheral projection 24A can be press-fitted into the groove portion 40E, which will be described later.

[0056] The cylindrical member 24 may be integrated with the outer shell member 1, or it may be a separate member connected to the outer shell member 1 while maintaining airtightness. The outer peripheral projection 24A is a portion that protrudes further outward from the outer circumference in the region near the communication portion 14, surrounding the outer circumference of this region.

[0057] On the other hand, the engaging portion 41D is provided with an expanded tube portion 40D on the upper end side of the housing member 40. The expanded tube portion 40D is a part of the housing member 40 in which the outer diameter is set to be larger than the circumference of the outer peripheral projection 24A. The inner circumferential surface of the expanded tube portion 40D is set to have a large inner diameter, similar to the outer diameter, and this portion constitutes a groove portion 40E. The groove portion 40E is formed along the circumferential direction of the inner circumferential surface of the housing member 40.

[0058] When engaging the engaging portion 41D with the engaged portion 21D, the outer peripheral projection 24A is pressed into the groove portion 40E. As a result, as shown in Figure 10A, the communication portion 14 and the gas flow path 75 are connected while maintaining airtightness.

[0059] In the sixth modified battery system 106, for example, a breathable plate member 83 may be provided instead of the pressing member 81. The breathable plate member 83 is configured to be smaller than the inner diameter of the housing member 40 and larger than the inner diameter of the cylindrical member 24. That is, the elastic member 80 is provided by connecting a plate material (i.e., a breathable plate 50A, a breathable plate member 83) that allows gas to communicate between the end on the purifying material 70 side and the end on the engaged portion 21D side. The breathable plate member 83 has a contact surface (the surface of the breathable plate member 83 on the engaged portion 21D) that is larger (for example, its inner diameter) than the gas passage in the engaged portion 21D. The elastic member 80 is configured to be compressed toward the purifying material 70 side when the contact surface and the engaged portion 21D come into contact.

[0060] Therefore, when engaging the engaging portion 41D and the engaged portion 21D, as shown in Figure 10A, the breathable plate member 83 comes into contact with the lower end of the engaged portion 21D, and the breathable plate member 83 is pushed downward in the vertical direction. Even with this configuration, the same effects as the configuration of this embodiment can be enjoyed.

[0061] (2f) The functions of one component in the above embodiment may be distributed among multiple components, or the functions of multiple components may be integrated into one component. Also, some of the configurations of the above embodiment may be omitted. Also, at least some of the configurations of the above embodiment may be added to, replaced with, or otherwise adapted to the configurations of other above embodiments.

[0062] (2g) In addition to the purification device 3 described above, this disclosure can also be realized in various forms, such as a system or purification method that uses the purification device 3 as a component. [Explanation of Symbols]

[0063] 1...Outer shell member, 2...Secondary battery, 3...Purification device, 11...Housing space, 14...Communication part, 15...Communication plate, 16...Protruding member, 17...Groove, 21A~21D...Engaged part, 22...Male screw part, 23...Extension part, 24...Cylindrical member, 24A...Outer circumference projection, 40...Housing member, 41A~41D...Engaging part, 43...Receiving part, 44...Placement part, 45...Filling part, 50A,50B...Ventilation plate, 51...Ventilation hole, 60A,60B...Filter, 70...Purification material, 75...Flow path, 80...Elastic member, 81...Pressing member, 82...Protruding plate, 83...Ventilated plate member, 100~106...Battery system.

Claims

1. A purification device configured to purify gas generated by a secondary battery, A granular purifying material that cleans gas, Elastic member and A housing member is positioned on the outside of the battery case housing the secondary battery, connected to the battery case, and houses the purifying material, forming a passage for the gas flowing out of the battery case, Equipped with, The aforementioned housing member is The flow path is filled with the purifying material in a filled section, Adjacent to the filling portion is an arrangement portion where the elastic member is arranged, It has, The elastic member is positioned to press against the purifying material in the purification device.

2. A purification device according to claim 1, The purifying device comprises an engaging portion configured to be detachably engaged with an engaging portion located in the battery case, wherein the housing member is configured to engage with an engaging portion located in the battery case.

3. A purification device according to claim 2, A purification device in which the engaging portion and the engaged portion are configured to be able to engage by rotating relative to each other.

4. A purification device according to claim 3, The purifying device comprises a screw portion that can engage with the engaging portion and the engaged portion.

5. A purification device according to claim 3 or claim 4, The elastic member is configured to be compressed toward the purifying material by the engaged portion when the engaging portion engages with the engaged portion in the purifying device.

6. A purification device according to claim 5, The elastic member is provided with a plate material connected to the end on the purifying material side and the end on the engaged portion side, allowing gas to communicate between them. The plate material on the engaged portion side has a contact surface larger than the gas flow path in the engaged portion, and the elastic member is compressed toward the purifying material side when the contact surface and the engaged portion come into contact, in this purification device.

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