Pressure regulating valve for energy storage modules

Abstract

A purpose of the present invention is to improve the discharge of an electrolyte.　A pressure-regulating valve (1) for a power storage module comprises: a valve part (10) that opens in response to pressure inside a power storage module so as to release pressure in the power storage module; and an electrolytic solution reservoir part (130) that is provided between the valve part (10) and the power storage module, and is capable of storing electrolytic solution that has leaked from inside the power storage module to the valve part (10) side.

Description

[Technical Field]

[0001] The present invention relates to a pressure regulating valve for an electricity storage module. [Background technology]

[0002] Conventionally, in a power storage module such as a nickel-metal hydride battery, a pressure regulation valve is provided that opens to discharge gas from the module when a gas such as hydrogen gas is generated due to over-discharge or the like and the pressure inside the module reaches a predetermined level. Note that a pressure regulation valve for a power storage module (hereinafter referred to as a "pressure regulation valve for a power storage module") is known that has a simple configuration and is capable of regulating the pressure in multiple internal spaces between bipolar electrodes (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2019 / 064843 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, when the pressure adjustment valve for the electricity storage module opens, the electrolyte may be discharged along with the gas, and in this case, the electrolyte may accumulate inside the pressure adjustment valve for the electricity storage module.

[0005] However, conventional pressure regulation valves for energy storage modules have multiple valve bodies attached to one outlet, making it difficult to smoothly discharge the electrolyte. Furthermore, because it is difficult to smoothly discharge the electrolyte with conventional pressure regulation valves for energy storage modules, the multiple valve bodies are often submerged in the electrolyte. In this case, if multiple valve bodies are simultaneously opened and the electrolyte is discharged, there is a risk of short-circuiting between multiple cells due to the electrolyte.

[0006] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a pressure regulating valve for an electricity storage module that can improve the discharge of electrolyte. [Means for solving the problem]

[0007] In order to achieve the above object, the pressure regulating valve for a storage module according to the present invention comprises a valve body portion that opens in response to the pressure inside the storage module to release the pressure inside the storage module, and an electrolyte storage portion that is provided between the valve body portion and the storage module and is capable of storing electrolyte that has leaked from inside the storage module toward the valve body portion.

[0008] In the pressure regulating valve for an electricity storage module according to one aspect of the present invention, the electrolyte reservoir is configured as a separate member from the valve body.

[0009] In the pressure regulating valve for an electricity storage module according to one aspect of the present invention, the electrolyte reservoir is formed in a plate shape.

[0010] In the pressure adjustment valve for an electricity storage module according to one aspect of the present invention, the electrolyte reservoir has an air chamber having a space that communicates with the valve body.

[0011] In a pressure regulating valve for a storage module according to one aspect of the present invention, the air chambers are provided at one end and the other end of the electrolyte storage section, and the electrolyte storage section has a flow path section that connects the air chamber provided at one end with the air chamber provided at the other end.

[0012] In the pressure regulating valve for an electricity storage module according to one aspect of the present invention, the electrolyte reservoir has a plurality of the air chambers. [Effects of the Invention]

[0013] The pressure regulating valve for an electricity storage module according to the present invention can improve the discharge of electrolyte. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a perspective view schematically showing an energy storage module to which a pressure adjustment valve for an energy storage module according to an embodiment of the present invention is connected. [Figure 2] 1 is an exploded perspective view showing a schematic configuration of a pressure regulating valve for an electricity storage module according to an embodiment of the present invention. [Figure 3] FIG. 3 is an exploded perspective view showing a schematic configuration of the pressure adjustment valve for the electricity storage module shown in FIG. 2. [Figure 4] FIG. 3 is a cross-sectional view of the pressure adjustment valve for the electricity storage module shown in FIG. 2. [Figure 5] 3 is a front view of a case portion of the pressure adjustment valve for the electricity storage module shown in FIG. 2. FIG. [Figure 6] 4 is a cross-sectional view of the case part shown in FIG. 3 along the line AA. [Figure 7] 3 is a front view of a cover portion of the pressure adjustment valve for the electricity storage module shown in FIG. 2. FIG. [Figure 8] FIG. 6 is a plan view of the cover shown in FIG. 5. [Figure 9] 3 is a perspective view showing an electrolyte reservoir of the pressure adjustment valve for the electricity storage module shown in FIG. 2. FIG. [Figure 10] FIG. 10 is a front view of the electrolyte reservoir shown in FIG. [Figure 11] FIG. 10 is a plan view of the electrolyte reservoir shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0016] Fig. 1 is a perspective view schematically showing an energy storage module 500 to which a pressure adjustment valve 1 for an energy storage module according to an embodiment of the present invention is connected. Figs. 2 and 3 are exploded perspective views showing the general configuration of the pressure adjustment valve 1 for an energy storage module according to an embodiment of the present invention. Fig. 4 is a cross-sectional view of the pressure adjustment valve 1 for an energy storage module. In Fig. 2 and subsequent figures, the pressure adjustment valve 1 for an energy storage module is shown in a partially enlarged view of a portion A shown in Fig. 1.

[0017] For ease of explanation, the axial direction of the cylindrical valve body 30 in the pressure regulation valve 1 for an energy storage module shown in FIGS. 2, 3, and 4 will be referred to as the Y-axis direction. The Y-axis direction will also be referred to as the front-rear direction. In the pressure regulation valve 1 for an energy storage module, the +Y-axis direction will also be referred to as one end side, and the -Y-axis direction will also be referred to as the other end side. Furthermore, in this embodiment, the direction in which the pressure regulation valve 1 for an energy storage module is viewed in the +Y-axis direction will be referred to as the front direction. One of the directions (X-axis direction) perpendicular to the front-rear direction (Y-axis direction) will be referred to as the width direction. The width direction is the longitudinal direction of the valve body portion 10 of the pressure regulation valve 1 for an energy storage module. The width direction will also be referred to as the left-right direction. Furthermore, the direction (Z-axis direction) perpendicular to both the front-rear direction (Y-axis direction) and the left-right direction (X-axis direction) will also be referred to as the up-down direction or height direction. In the following description, when the positional relationship and direction of each component are described as right side, left side, front side, rear side, top side, and bottom side, this refers only to the positional relationship and direction in the drawings and does not limit the positional relationship and direction in an actual pressure regulating valve for a storage module.

[0018] 2, 3, and 4, a pressure regulating valve 1 for an energy storage module according to an embodiment of the present invention includes a valve body 10 that opens in response to the pressure inside the energy storage module 500 to release the pressure inside the energy storage module 500, and an electrolyte reservoir 130 that is provided between the valve body 10 and the energy storage module 500 and that is capable of storing electrolyte that has leaked from inside the energy storage module 500 toward the valve body 10. The pressure regulating valve 1 closes an opening 503 in a frame 502 that holds multiple electrode plates of the energy storage module 500, the opening 503 communicating with spaces between the multiple electrode plates provided in the frame 502. In the pressure regulating valve 1, the valve body 10 has one end connected to the opening 503 and has an internal space S1 therein. A columnar valve body 30, which is an elastic member, is housed in the internal space S1 of the valve body 10. The valve body portion 10 includes a bottom portion 111 provided on one end side, an opening portion 113 provided on the other end side, a cylindrical case portion 114 provided in the internal space S1 of the valve body portion 10 and capable of accommodating the valve body 30, a pressure introducing portion 115 penetrating the bottom portion 111, a cover portion 116 serving as a lid portion for closing the opening portion 113, and a protrusion portion 117 provided on the cover portion 116 and coming into contact with the end face 31 of the valve body 30 from the other end side. The electrolyte reservoir portion 130 includes an air chamber 131 which is a space that communicates with the outside of the valve body portion 10, specifically with the opening 503 of the frame body 502 and the pressure introducing portion 115. The pressure adjustment valve 1 for an electricity storage module will be described in detail below.

[0019] As described above, the pressure regulating valve 1 for an electricity storage module (hereinafter referred to as the “pressure regulating valve 1 ”) includes the valve body portion 10 that houses the valve body 30 and is attached to the opening 503 of the electricity storage module 500 .

[0020] The material of the valve body 10 is not particularly limited, and examples thereof include synthetic resin. The valve body 10 can be, for example, approximately rectangular parallelepiped. The shape of the valve body 10 is not particularly limited as long as it can close the opening 503. The size of the valve body 10 is also not particularly limited and can be set appropriately in relation to the size of the power storage module 500 or the opening 503. The valve body 10 is composed of a case 110 and a cover 116, each of which is a separate member. The electrolyte reservoir 130 is composed of a separate member from the valve body 10. In the pressure regulating valve 1, the case 110, the cover 116, and the electrolyte reservoir 130 may be made of the same material or different materials.

[0021] Fig. 5 is a front view of the case 110 of the pressure adjustment valve for an electricity storage module 1. Fig. 6 is a cross-sectional view of the case 110 taken along line AA.

[0022] 5 and 6, the case 110 is a box-shaped member formed in the shape of a rectangular parallelepiped, with the width dimension being longer than the height dimension and the front-rear dimension. The case 110 includes a bottom 111, an outer peripheral wall 112, an opening 113, a cylindrical case portion 114, and a pressure introducing portion 115.

[0023] The bottom 111 is provided on one end side of the case 110. As shown in Fig. 4 , the bottom 111 is attached so as to face the opening 503 via the electrolyte reservoir 130 when the pressure regulating valve 1 is attached to the opening 503 of the frame 502. The bottom 111 is formed so as to be able to block the opening 503 via the electrolyte reservoir 130 when attached to the opening 503.

[0024] The outer peripheral wall 112 is provided at the outer peripheral edge of the bottom 111. The outer peripheral wall 112 is provided at an end 1111 in the vertical direction of the bottom 111. The outer peripheral wall 112 is a wall-shaped member that rises from the end 1111 in the vertical direction of the bottom 111 toward the other end (in the -Y axis direction). The bottom 111 and the outer peripheral wall 112 form an internal space S1 inside the case 110 that is isolated from the outside.

[0025] The opening 113 is provided in an end 1122 on the other end side of the outer peripheral wall 112. By providing the opening 113, the other end side of the internal space S1 of the case 110 is open to the outside.

[0026] The case cylindrical portion 114 is provided in the internal space S1 of the case portion 110. The case cylindrical portion 114 is a cylindrical or approximately cylindrical portion of the case portion 110 whose axial direction is the front-to-rear direction (Y-axis direction). One or more case cylindrical portions 114 are provided in the internal space S1. In the pressure regulating valve 1, the number of case cylindrical portions 114 is not particularly limited. One end of the case cylindrical portion 114 is integral with an inner surface 1112, which is the surface on the other end side of the bottom portion 111. The other end of the case cylindrical portion 114 opens toward the opening 113. The case cylindrical portion 114 can accommodate the valve element 30 in the cylindrical or approximately cylindrical inner accommodation space S2. In other words, the pressure regulating valve 1 can accommodate multiple valve elements 30 corresponding to the number of case cylindrical portions 114 provided in the internal space S1.

[0027] The pressure introducing portion 115 is provided in the cylindrical portion bottom portion 1113, which is the bottom portion located inside the cylindrical case portion 114. The pressure introducing portion 115 is a through-hole that extends in the Y-axis direction in the cylindrical portion bottom portion 1113. In other words, the pressure introducing portion 115 penetrates from one end side to the other end side of the cylindrical portion bottom portion 1113. The pressure introducing portion 115 is not limited to being provided near the center of the circle or approximately circle of the cylindrical portion bottom portion 1113 as shown in FIG. 4. Furthermore, the pressure introducing portion 115 is usually a cylindrical space, but there are no particular limitations on the shape, and it may also be a space in the shape of an elliptical cylinder or a polygonal cylinder, for example.

[0028] Fig. 7 is a front view of the cover portion 116 of the pressure adjustment valve for the electricity storage module 1. Fig. 8 is a plan view of the cover portion 116.

[0029] 7 and 8, the cover 116 is, for example, a rectangular plate-like or substantially plate-like member whose width is longer than its height. The cover 116 includes a cover body 1161 and a protrusion 117.

[0030] The cover body 1161 determines the general shape of the above-described plate-like or approximately plate-like cover body 116. The shape of the cover body 1161 is not limited to the shapes shown in Figures 7 and 8, as long as the cover body 116 can be combined with the case body 110.

[0031] The protrusions 117 are protruding portions protruding in the Y-axis direction from the cover body 1161. The protrusions 117 are provided in a number corresponding to the number of the cylindrical case portions 114. The protrusions 117 are provided at positions inside the cylindrical surface of the cylindrical case portion 114 when the cover portion 116 and the case portion 110 are combined as shown in FIG. 3. When the cover portion 116 and the case portion 110 are combined, the protrusions 117 protrude toward the case portion 110 at one end (+Y-axis direction) and press the valve body 30 arranged inside the cylindrical case portion 114 from the opening 113 side.

[0032] The protrusion 117 comes into contact with the end face 31 of the valve body 30. By closing the opening 113 of the case part 110 with the cover part 116, the protrusion 117 applies pressure to the valve body 30. The valve body 30 airtightly closes the pressure introducing part 115, as will be described later.

[0033] There are no particular restrictions on the shape or dimensions of the protrusion 117, as long as it is possible to apply pressure to the valve body 30 by blocking the opening 113 of the case part 110 with the cover part 116, and it can be, for example, cylindrical, elliptical cylindrical, polygonal cylindrical, etc.

[0034] 2 to 4, the electrolyte reservoir 130 is attached to one end side of the bottom 111 of the case 110 in the valve body 10. In the pressure regulating valve 1, a plurality of, for example, three, electrolyte reservoirs 130 may be attached, or a single electrolyte reservoir 130 may be attached.

[0035] Fig. 9 is a perspective view showing the electrolyte reservoir 130 of the pressure regulating valve 1. Fig. 10 is a front view of the electrolyte reservoir 130. Fig. 11 is a plan view of the electrolyte reservoir 130.

[0036] 9 to 11, the electrolyte storage portion 130 has an air chamber 131 and a flow path portion 132. The electrolyte storage portion 130 is formed as a separate member from the case portion 110 and the cover portion 116. The electrolyte storage portion 130 is formed in a plate-like or approximately plate-like shape whose dimension in the front-to-rear direction (Y-axis direction) is shorter than its dimensions in the height direction (Z-axis direction) and the width direction (X-axis direction) of the pressure regulating valve 1.

[0037] The air chamber 131 is formed in a recessed shape having a depth in the Y-axis direction on the surface of one end side (+Y-axis direction) and the other end side (-Y-axis direction) of the electrolyte solution storage section 130, as shown in FIG. 11. The air chamber 131 has air chamber openings 1311 opening on the surface of one end side (+Y-axis direction) and the other end side (-Y-axis direction) of the electrolyte solution storage section 130. The shape of the air chamber 131 is, for example, rectangular or approximately rectangular in plan view, as shown in FIG. 10. The shape of the air chamber 131 is not limited to the above-mentioned shape, as long as it can store the electrolyte solution, compressed gas, or the like discharged from the opening 503 of the electricity storage module 500.

[0038] In the electrolyte reservoir 130, for example, two air chambers 131 are provided on each of the surfaces of one end side (+Y axis direction) and the other end side (-Y axis direction), for a total of four air chambers 131. Note that the number of air chambers 131 is not limited to the above example.

[0039] The flow path portion 132 is a hole that penetrates the bottoms 1312 of the air chamber 131 on one end side and the air chamber 131 on the other end side in the electrolyte solution storage portion 130. The flow path portion 132 connects the air chambers 131 provided on both the one end side and the other end side of the electrolyte solution storage portion 130 to each other.

[0040] As shown in FIG. 4 , in the pressure regulating valve 1, a plurality of (e.g., three) electrolyte solution storage sections 130 are attached so as to be stacked in the front-to-rear direction (Y-axis direction), which is the discharge direction of discharged materials such as electrolyte solution or compressed gas discharged from the opening 503 of the power storage module 500. One of the three electrolyte solution storage sections 130 has an air chamber opening 1311 at one end facing the opening 503 of the frame body 502. With the electrolyte solution storage sections 130 arranged in this manner, the air chamber 131 at one end communicates with the opening 503 of the frame body 502. With the pressure regulating valve 1, one of the three electrolyte solution storage sections 130 has an air chamber opening 1311 at the other end facing the opening 1151 at one end of the pressure introducing section 115 of the case section 110. With the electrolyte solution storage sections 130 arranged in this manner, the air chamber 131 at the other end communicates with the pressure introducing section 115. The plurality of electrolyte storage sections 130 have air chambers 131 and flow path sections 132 that communicate with each other and form flow paths that penetrate in the front-to-rear direction. The number of electrolyte storage sections 130 is not limited to the number described above. Increasing the number of electrolyte storage sections 130 allows the pressure adjustment valve 1 to increase the volume of the electrolyte storage sections 130. Increasing the volume of the electrolyte storage sections 130 allows the pressure adjustment valve 1 to handle even cases where the amount of overflowing electrolyte increases.

[0041] As shown in FIG. 2, the valve element 30 is columnar and is housed in the cylindrical case portion 114 of the case portion 110 in the valve element portion 10. The material of the valve element 30 is, for example, an elastic material such as rubber. There are no particular restrictions on the material of the valve element 30 as long as it is an elastic material. The valve element 30 is arranged so as to cover the cylindrical portion bottom portion 1113 side of the cylindrical case portion 114. The length of the valve element 30 in the axial direction (Y-axis direction) is shorter than the outer diameter.

[0042] The valve element 30 is columnar, but as described above, the axial length is shorter than the outer diameter, and this "columnar" can also be called a plate or disk shape. More specifically, the valve element 30 can be approximately disk-shaped.

[0043] The valve element 30 is inserted into the cylindrical case portion 114 to close the opening of the pressure introducing portion 115. By closing the pressure introducing portion 115 with the valve element 30, the pressure introducing portion 115 remains airtight until the interior of the energy storage module 500 reaches a desired pressure while the pressure regulating valve 1 is attached to the energy storage module 500. When the internal pressure of the energy storage module 500 (hereinafter simply referred to as "internal pressure") rises to a desired value, the valve element 30 separates from the cylindrical portion bottom 1113 and opens in accordance with the internal pressure of the energy storage module 500. The internal pressure value of the energy storage module 500 at which the valve element 30 separates from the cylindrical portion bottom 1113 is determined so that the internal pressure of the energy storage module 500 does not become excessive when the valve element 30 opens. The internal pressure value of the energy storage module 500 at which the valve element 30 separates from the cylindrical portion bottom 1113 may vary depending on various conditions. Specifically, the value of the internal pressure is a value that can change depending on individual differences (variations) in the valve element 30 and changes over time. By moving away from the cylindrical portion bottom 1113, a gap is created between the valve element 30 and the cylindrical portion bottom 1113. The compressed gas inside the energy storage module 500 is introduced from the energy storage module 500 into the pressure adjustment valve 1 through this gap. By introducing the compressed gas into the pressure adjustment valve 1, the internal pressure of the energy storage module 500 decreases. When the pressure inside the energy storage module 500 decreases, the elastic force of the valve element 30 returns to its original position inside the cylindrical case portion 114, i.e., the position where it contacts the cylindrical portion bottom 1113, and airtightly closes the pressure introduction portion 115.

[0044] Here, in the pressure regulating valve 1, when the valve element 30 separates from the cylindrical portion bottom 1113 and the compressed gas inside the electricity storage module 500 is discharged from a gap formed between the valve element 30 and the cylindrical portion bottom 1113, the electrolyte may be discharged together with the compressed gas. In this case, the electrolyte may accumulate inside the case cylindrical portion 114.

[0045] The pressure regulating valve 1 is provided with an electrolyte reservoir 130 having an air chamber 131 on the near side (one end side) of the pressure introducing section 115 in the flow path from the opening 503 of the power storage module 500 to the case section 110. As shown in Fig. 4, the air chamber 131 is a space having a predetermined volume capable of storing discharged matter such as the electrolyte discharged from the opening 503 of the power storage module 500. Therefore, by providing the air chamber 131, the pressure regulating valve 1 can suppress the discharge of discharged matter such as the electrolyte, in particular the ejection of discharged matter due to a sudden change in pressure.

[0046] In addition, by suppressing the discharge of waste materials using the air chamber 131, the pressure regulating valve 1 can prevent short circuits from occurring between multiple cells due to the electrolyte when multiple valve bodies 30 are opened simultaneously and the electrolyte is discharged.

[0047] Therefore, the pressure regulating valve 1 can alleviate the problems caused by the electrolyte being discharged from the electricity storage module 500.

[0048] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and includes all aspects encompassed within the concept and scope of the claims. Furthermore, each configuration may be appropriately and selectively combined to achieve at least some of the above-described problems and effects. For example, the shape, material, arrangement, size, etc. of each component in the above-described embodiments may be appropriately modified depending on the specific use of the present invention.

[0049] In the pressure regulating valve 1 described above, the valve body portion 10 has the case portion 110, the cover portion 116, and the electrolyte storage portion 130 each formed as separate bodies (separate members), but is not limited to this configuration. For example, the case portion 110 and the electrolyte storage portion 130 may be integrated. That is, in the pressure regulating valve 1, the air chamber 131 may be provided in the case portion 110.

[0050] The air chamber 131 may be provided at both one end and the other end of the electrolyte solution storage section 130 as long as it communicates with the electrolyte solution storage section 130 in the front-to-rear direction (Y-axis direction). In other words, the electrolyte solution storage section 130 may not have a flow path section 132, and the air chamber 131 itself may be provided in communication with the front-to-rear direction (Y-axis direction). The air chamber 131 may be provided at either one end or the other end of the electrolyte solution storage section 130, for example, and may be connected to the other of the one end or the other end of the electrolyte solution storage section 130 by the flow path section 132. [Explanation of symbols]

[0051] 1...pressure regulating valve for power storage module (pressure regulating valve), 10...valve body portion, 30...valve body, 31...end surface, 110...case portion, 111...bottom portion, 112...outer peripheral wall portion, 113...opening portion, 114...cylindrical case portion, 115...pressure introducing portion, 116...cover portion, 117...projection portion, 130...electrolyte storage portion, 131...air chamber, 132...flow path portion, 500...power storage module, 502...frame body, 503...opening, 1112...inner surface, 1113...bottom of cylindrical portion, 1111, 1122...end portion, 1151...opening, 1161...cover portion main body, 1311...air chamber opening, 1312...bottom

Claims

1. a valve body portion that opens in response to pressure in the electricity storage module to release the pressure in the electricity storage module; an electrolyte reservoir provided between the valve body and the electricity storage module, the electrolyte reservoir being capable of storing electrolyte that has leaked from the electricity storage module toward the valve body; Equipped with the electrolyte reservoir has an air chamber having a space communicating with the valve body, the air chambers are provided at one end and the other end of the electrolyte reservoir, the electrolyte reservoir has a flow path that communicates the air chamber provided on one end side with the air chamber provided on the other end side; Pressure regulating valve for energy storage modules.

2. The electrolyte reservoir is configured as a separate member from the valve body. The pressure regulating valve for an electricity storage module according to claim 1 .

3. The electrolyte reservoir is formed in a plate shape. The pressure regulating valve for an electricity storage module according to claim 2 .

4. The electrolyte reservoir has a plurality of the air chambers. The pressure regulating valve for an electricity storage module according to claim 1 .

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