Power storage device

Abstract

To provide a power storage device capable of restraining clogging of a discharge section.SOLUTION: A power storage device 1 includes a plurality of power storage cells, a case, and a desulfurization unit. The case includes a top wall 222, and the top wall 222 has an exhaust section 224 for exhausting gas inside the case to the outside of the case. The desulfurization unit includes a desulfurization agent 310 and a communication path 320 that accommodates the desulfurization agent 310 and connects the inside of a case 200 to the exhaust section 224. The communication path 320 includes a discharge side vertical path 321 that extends downward from the exhaust section, a support path 322 that extends horizontally from the lower end portion of the discharge side vertical path and supports the desulfurization agent, and a suction side vertical path 323 that extends upward from the end portion of the support path and opens into the case.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to an electricity storage device. [Background technology]

[0002] For example, JP 2021-197221 A discloses an all-solid-state battery pack including a plurality of all-solid-state cells, a housing that houses the plurality of all-solid-state cells, an intake mechanism that sends gas into the housing from outside the housing, and an exhaust mechanism that exhausts the gas inside the housing to the outside of the housing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-197221 Summary of the Invention [Problem to be solved by the invention]

[0004] In the all-solid-state battery pack described in JP 2021-197221 A, a desulfurizing agent is sometimes used to remove hydrogen sulfide contained in the gas inside the housing. In this case, if the desulfurizing agent is crushed due to vibration or the like, there is a concern that the exhaust port may be blocked.

[0005] An object of the present disclosure is to provide an electricity storage device that can suppress clogging of a discharge section. [Means for solving the problem]

[0006] According to one aspect of the present disclosure, there is provided a power storage device comprising: a plurality of power storage cells; a case that houses the plurality of power storage cells; and a desulfurization unit that is disposed within the case. The case includes a top wall that is disposed above the plurality of power storage cells, and the top wall has an exhaust portion for exhausting gas from within the case to the outside of the case. The desulfurization unit includes a desulfurization agent and a communication path that houses the desulfurization agent and connects the inside of the case to the exhaust portion. The communication path includes a discharge-side vertical path that extends downward from the exhaust portion, a support path that extends horizontally from a lower end of the discharge-side vertical path and supports the desulfurization agent, and a suction-side vertical path that extends upward from an end of the support path and opens into the case. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide an electricity storage device that can suppress clogging of the discharge section. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view schematically illustrating a power storage device according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a plan view schematically showing a desulfurization unit. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The present disclosure will be described with reference to the accompanying drawings, in which the same or corresponding elements are designated by the same reference numerals.

[0010] 1 is a perspective view schematically illustrating an electricity storage device according to an embodiment of the present disclosure. The electricity storage device 1 is preferably mounted on a vehicle.

[0011] As shown in FIG. 1, the energy storage device 1 includes a plurality of energy storage cells 100, a case 200, and a desulfurization unit 300.

[0012] The plurality of storage cells 100 are arranged side by side in one direction (for example, the width direction of the vehicle). An example of each storage cell 100 is a lithium ion battery. Each storage cell 100 is formed in the shape of a flat rectangular parallelepiped.

[0013] The case 200 houses a plurality of energy storage cells 100. The case 200 has a lower case 210 that opens upward, and an upper cover 220 that houses the plurality of energy storage cells 100 together with the lower case 210. The upper cover 220 includes a top wall 222 that is arranged above the plurality of energy storage cells 100. The top wall 222 has an exhaust portion 224 for exhausting gas (including hydrogen sulfide gas) inside the case 200 to the outside of the case 200. The exhaust portion 224 is formed by a pressure regulating valve (a so-called breathing membrane).

[0014] The desulfurization unit 300 removes sulfur-based components from the gas inside the case 200. The desulfurization unit 300 includes a desulfurization agent 310, a communication path 320, a discharge-side holding plate 331, a suction-side holding plate 332, a discharge-side filter 341, and a suction-side filter 342.

[0015] The desulfurizing agent 310 is formed into pellets.

[0016] The communication path 320 contains the desulfurizing agent 310 and connects the inside of the case 200 with the discharge section 224. The communication path 320 has a discharge-side vertical path 321, a support path 322, and a suction-side vertical path 323.

[0017] The discharge-side vertical path 321 extends downward from the discharge section 224 .

[0018] The support path 322 extends horizontally from the lower end of the discharge-side vertical path 321. The support path 322 supports the desulfurization agent 310.

[0019] The suction-side vertical path 323 extends upward from the end of the support path 322. The upper end of the suction-side vertical path 323 opens into the case 200. The upper end of the suction-side vertical path 323 is spaced downward from the top wall 222.

[0020] As shown in FIG. 2, the support path 322 includes a first path 322a, a second path 322b, and a third path 322c.

[0021] The first path 322a extends in a first direction (left-right direction in FIG. 2) perpendicular to the up-down direction from the lower end of the discharge-side vertical path 321. In this embodiment, the first path 322a extends in the first direction toward the suction-side vertical path 323.

[0022] The second path 322b extends in the first direction from the lower end of the suction-side vertical path 323. In this embodiment, the second path 322b extends in a direction approaching the discharge-side vertical path 321 in the first direction.

[0023] The third path 322c connects the first path 322a and the second path 322b. The third path 322c has a shape that extends along a second direction (the vertical direction in FIG. 2) that is perpendicular to both the vertical direction and the first direction. The desulfurization agent 310 is disposed in the third path 322c.

[0024] The discharge-side holding plate 331 is connected to the upper end of the discharge-side vertical path 321. The discharge-side filter 341 is held by the discharge-side holding plate 331. As shown in FIG. 3 , the discharge-side holding plate 331 holds the discharge-side filter 341 so that the discharge-side filter 341 is disposed between the discharge section 224 and the discharge-side vertical path 321.

[0025] The suction-side holding plate 332 is connected to the upper end of the suction-side vertical path 323. The suction-side filter 342 is held by the suction-side holding plate 332. The suction-side holding plate 332 holds the suction-side filter 342 so that the suction-side filter 342 is positioned at a distance from the top wall 222.

[0026] As described above, in the energy storage device 1 of this embodiment, the desulfurizing agent 310 is supported on the horizontally extending support path 322. Therefore, even if the desulfurizing agent 310 is crushed due to vibration or the like, ventilation between the inside of the case 200 and the discharge portion 224 is ensured through the upper space in the support path 322. Therefore, clogging of the discharge portion 224 is suppressed.

[0027] Furthermore, since the communication path 320 is connected to the ceiling wall 222 and is located in the upper space within the case 200 where the concentration of hydrogen sulfide gas is relatively low, even if hydrogen sulfide gas is generated within the case 200, high concentrations of hydrogen sulfide gas are prevented from entering the desulfurization unit 300 and desulfurization in the desulfurization unit 300 is prevented from becoming insufficient.

[0028] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of aspects described below.

[0029] [Aspect 1] A plurality of storage cells; a case that houses the plurality of power storage cells; a desulfurization unit disposed in the case, the case includes a top wall disposed above the plurality of energy storage cells, the top wall has an exhaust portion for exhausting gas inside the case to the outside of the case, The desulfurization unit comprises: A desulfurizing agent; a communication path that accommodates the desulfurization agent and connects the inside of the case with the discharge portion, The communication path is a discharge-side vertical path extending downward from the discharge portion; a support path extending horizontally from a lower end of the discharge-side vertical path and supporting the desulfurization agent; and an suction-side vertical path extending upward from an end of the support path and opening into the case.

[0030] In this energy storage device, the desulfurizing agent is supported on a horizontally extending support path, so even if the desulfurizing agent is crushed due to vibration or other reasons, ventilation between the inside of the case and the discharge part is ensured through the space above the support path, thereby preventing blockage of the discharge part.

[0031] Furthermore, the communication path is connected to the ceiling wall and is located in the upper space within the case where the concentration of hydrogen sulfide gas is relatively low. Therefore, even if hydrogen sulfide gas is generated within the case, high concentrations of hydrogen sulfide gas are prevented from entering the desulfurization unit, and desulfurization in the desulfurization unit is prevented from becoming insufficient.

[0032] [Aspect 2] 2. The power storage device according to claim 1, wherein the exhaust unit is configured as a pressure regulating valve that regulates pressure inside the case.

[0033] [Aspect 3] The desulfurization unit comprises: a discharge-side holding plate connected to an upper end of the discharge-side vertical path; a suction-side holding plate connected to an upper end of the suction-side vertical path; a discharge-side filter held by the discharge-side holding plate; a suction-side filter held by the suction-side holding plate, 3. The power storage device according to aspect 2, wherein the discharge-side holding plate holds the discharge-side filter such that the discharge-side filter is disposed between the pressure adjustment valve and the discharge-side vertical path.

[0034] [Aspect 4] The support path is a first path extending from a lower end of the discharge-side vertical path in a first direction perpendicular to the vertical direction; a second path extending in the first direction from a lower end of the suction-side vertical path; a third path connecting the first path and the second path, 4. The power storage device according to any one of aspects 1 to 3, wherein the third path has a shape that extends along a second direction that is perpendicular to both the up-down direction and the first direction.

[0035] It should be noted that the embodiments disclosed herein are illustrative in all respects and should not be considered limiting. The scope of the present disclosure is defined by the claims rather than the description of the above embodiments, and further includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0036] 1 Energy storage device, 100 Energy storage cell, 200 Case, 210 Lower case, 220 Upper cover, 222 Top wall, 224 Discharge section, 300 Desulfurization unit, 310 Desulfurization agent, 320 Communication path, 321 Discharge side upper and lower path, 322 Support path, 322a First path, 322b Second path, 322c Third path, 323 Suction side upper and lower path, 331 Discharge side holding plate, 332 Suction side holding plate, 341 Discharge side filter, 342 Suction side filter.

Claims

1. A plurality of storage cells; a case that houses the plurality of power storage cells; a desulfurization unit disposed in the case, the case includes a top wall disposed above the plurality of energy storage cells, the top wall has an exhaust portion for exhausting gas inside the case to the outside of the case, The desulfurization unit comprises: A desulfurizing agent; a communication path that accommodates the desulfurization agent and connects the inside of the case with the discharge portion, The communication path is a discharge-side vertical path extending downward from the discharge portion; a support path extending horizontally from a lower end of the discharge-side vertical path and supporting the desulfurization agent; a suction-side vertical path extending upward from an end of the support path and opening into the case; The support path is a first path extending from a lower end of the discharge-side vertical path in a first direction perpendicular to the vertical direction; a second path extending in the first direction from a lower end of the suction-side vertical path; a third path connecting the first path and the second path, The third path has a shape that extends along a second direction that is perpendicular to both the up-down direction and the first direction.

2. The power storage device according to claim 1 , wherein the exhaust section is configured by a pressure regulating valve that regulates pressure inside the case.

3. The desulfurization unit comprises: a discharge-side holding plate connected to an upper end of the discharge-side vertical path; a suction-side holding plate connected to an upper end of the suction-side vertical path; a discharge-side filter held by the discharge-side holding plate; a suction-side filter held by the suction-side holding plate, The power storage device according to claim 2 , wherein the discharge-side holding plate holds the discharge-side filter such that the discharge-side filter is disposed between the pressure regulating valve and the discharge-side vertical path.

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