Energy storage device
The energy storage device addresses gas discharge issues by thinning the peripheral wall on the second end plate side and positioning the exhaust valve there, ensuring effective gas containment and improved impact resistance.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- TOYOTA JIDOSHA KK
- Filing Date
- 2024-12-23
- Publication Date
- 2026-07-03
Smart Images
Figure 2026111244000001_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to a power storage device.
Background Art
[0002] Power storage cells included in power storage devices have been proposed in various ways. For example, Japanese Patent Application Laid-Open No. 2002-216709 discloses a power storage cell having a housing case and an electrode body housed in the housing case. In this power storage cell, the housing case has a first end plate provided with an electrode terminal and an exhaust valve, a second end plate, and a peripheral wall connecting the first end plate and the second end plate. The peripheral wall is formed to be thinner on the second end plate side than on the first end plate side. Thereby, the peripheral wall on the first end plate side presses the electrode body and suppresses the vibration of the electrode body within the housing case. Thereby, the impact resistance of the power storage cell is improved.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] It is known that gas is generated from the electrode body built in the power storage cell by charging and discharging. The generated gas increases the pressure inside the housing case. Here, since the peripheral wall of the power storage cell disclosed in Japanese Patent Application Laid-Open No. 2002-216709 is thick on the first end plate side where the exhaust valve is provided, the amount of deformation of the peripheral wall due to the pressure increase inside the housing case is larger on the second end plate side than on the first end plate side. Therefore, the gas generated inside the housing case tends to stay on the second end plate side, and since the discharge valve is provided on the first end plate, there is a risk that the gas will not be discharged from the discharge valve.
[0005] This disclosure has been made in view of the above-mentioned problems, and its purpose is to provide an energy storage device that can suppress the discharge of gas generated inside the storage cell housing case to the outside of the housing case. [Means for solving the problem]
[0006] The energy storage device according to this disclosure comprises an electrode body, a housing case for housing the electrode body, and an exhaust valve formed in the housing case. The housing case includes a first end plate, a second end plate, and a peripheral wall provided between the first end plate and the second end plate. The peripheral wall is formed to be thinner on the second end plate side than on the first end plate side. The exhaust valve is formed in the second end plate.
[0007] As described above, the peripheral wall of the energy storage device according to this disclosure is thinner on the second end plate side than on the first end plate side. Since the electrode body is housed in the housing case, the exhaust path for gas generated in the housing case to the second end plate side is wider than the exhaust path to the first end plate side. The exhaust valve is formed on the second end plate. As a result, it is possible to prevent gas generated in the housing case of the energy storage cell from being discharged to the outside of the housing case.
[0008] The peripheral wall of the energy storage device according to this disclosure may have an outer wall surface and an inner wall surface. The inner wall surface may be inclined with respect to the outer wall surface.
[0009] The thickness of the peripheral wall of the energy storage device according to this disclosure may be greater than the thickness of the second end plate. The peripheral wall of the energy storage device according to this disclosure may have a first side wall, a second side wall, a first main wall, and a second main wall. The first side wall and the second side wall are spaced apart in the width direction. The first main wall connects one end of the first side wall to one end of the second side wall, and the second main wall connects the other end of the first side wall to the other end of the second side wall. The thickness of the first main wall may be thinner than the thickness of the first side wall.
[0010] The peripheral wall of the energy storage device according to this disclosure may have a first side wall, a second side wall, a first main wall, and a second main wall. The first side wall and the second side wall are spaced apart in the width direction. The first main wall connects one end of the first side wall to one end of the second side wall, and the second main wall connects the other end of the first side wall to the other end of the second side wall. The first main wall may be formed such that it is thinner in the width direction towards the center than towards the first side wall.
[0011] The energy storage device according to this disclosure may be located at the bottom of the vehicle. The energy storage device may be arranged such that the first end plate is located on the bottom side of the vehicle and the second end plate is located on the ground side.
[0012] The first end plate of the energy storage device according to this disclosure may be formed to be thicker than the second end plate.
[0013] The first end plate of the energy storage device according to this disclosure may be provided with electrode terminals. The second end plate and the peripheral wall of the energy storage device according to this disclosure may each be formed from different materials.
[0014] The energy storage device according to this disclosure may include an electrode body, a housing case for housing the electrode body, and an exhaust valve formed in the housing case. The housing case may include a first end plate, a second end plate, and a peripheral wall provided between the first and second end plates. The peripheral wall may be formed to rise from the second end plate and to incline inward towards the housing case. The exhaust valve may be formed in the second end plate. [Effects of the Invention]
[0015] According to the energy storage device described herein, it is possible to prevent gas generated within the storage cell housing case from being discharged to the outside of the housing case. [Brief explanation of the drawing]
[0016] [Figure 1] This is a schematic diagram showing a vehicle equipped with an energy storage device according to an embodiment of the present disclosure. [Figure 2] It is an exploded perspective view of a power storage device in an embodiment of the present disclosure. [Figure 3] It is a perspective view of a power storage cell in an embodiment of the present disclosure. [Figure 4] It is an exploded perspective view of a power storage cell in an embodiment of the present disclosure. [Figure 5] It is a cross-sectional view of the power storage cell shown in FIG. 3 viewed in the direction of the V-V line arrow. [Figure 6] It is a cross-sectional view of the power storage cell shown in FIG. 4 viewed in the direction of the VI-VI line arrow. [Figure 7] It is a cross-sectional view of the power storage cell shown in FIG. 4 viewed in the direction of the VII-VII line arrow. [Figure 8] It is a cross-sectional view of Modification Example 1 of a power storage cell in an embodiment of the present disclosure. [Figure 9] It is a cross-sectional view of Modification Example 2 of a power storage cell in an embodiment of the present disclosure. [Figure 10] It is a cross-sectional view of Modification Example 3 of a power storage cell in an embodiment of the present disclosure. [Figure 11] It is a cross-sectional view of Modification Example 4 of a power storage cell in an embodiment of the present disclosure. [Figure 12] It is a cross-sectional view of Modification Example 5 of a power storage cell in an embodiment of the present disclosure. [Figure 13] It is a cross-sectional view of Modification Example 6 of a power storage cell in an embodiment of the present disclosure. [Figure 14] It is a cross-sectional view of Modification Example 7 of a power storage cell in an embodiment of the present disclosure. [Figure 15] It is a cross-sectional view of Modification Example 8 of a power storage cell in an embodiment of the present disclosure. [Figure 16] It is a cross-sectional view of Modification Example 9 of a power storage cell in an embodiment of the present disclosure. [Figure 17] It is a cross-sectional view of Modification Example 10 of a power storage cell in an embodiment of the present disclosure. [Figure 18] It is a perspective view of the case body of Modification Example 11 of a power storage cell in an embodiment of the present disclosure. [Figure 19]This is a cross-sectional view of the case body of modified example 11 of the energy storage cell in the embodiment of this disclosure. [Figure 20] This is a plan view of a modified example 1 of the bottom wall of a storage cell in an embodiment of the present disclosure. [Figure 21] This is a cross-sectional view of a modified example 1 of the bottom wall of a storage cell in an embodiment of the present disclosure. [Figure 22] This is a plan view of a modified example 2 of the bottom wall of a storage cell in an embodiment of the present disclosure. [Figure 23] This is a cross-sectional view of a modified example 2 of the bottom wall of a storage cell in an embodiment of the present disclosure. [Figure 24] This is a plan view of a modified example 3 of the bottom wall of a storage cell in an embodiment of the present disclosure. [Figure 25] This is a cross-sectional view of a modified example 3 of the bottom wall of a storage cell in an embodiment of the present disclosure. [Modes for carrying out the invention]
[0017] Embodiments of this disclosure will be described with reference to Figures 1 to 25. In the drawings referred to below, the same or equivalent components are given the same numbers.
[0018] Figure 1 is a schematic diagram showing a vehicle 1 equipped with an energy storage device 2A. The vehicle 1 includes the vehicle body 2B, and the energy storage device 2A is located at the bottom 2Ba of the vehicle body 2B.
[0019] Figure 2 is an exploded perspective view showing the energy storage device 2A. In Figure 2, the width direction W is the width direction of the energy storage device 2A, and is also the vehicle width direction of vehicle 1. The length direction L is the front-to-back direction of the energy storage device 2A, and is also the front-to-back direction of vehicle 1. The vertical direction H is the vertical direction.
[0020] The energy storage device 2A includes a storage case 3, an energy storage cell 100, a cooling device 4, and electrical equipment 5. The storage case 3 includes a lower case 6, an upper case 7, an insulating plate 8, and a shear panel 9.
[0021] The lower case 6 is formed to open upwards, and the upper case 7 is provided to close the opening of the lower case 6.
[0022] The lower case 6 includes a bottom plate 10, an outer wall 11, partition walls 12 and 13, and an insulating plate 14.
[0023] Multiple openings 10a are formed in the base plate 10. The openings 14a, 10a, and 8a are arranged in the vertical direction H relative to each other.
[0024] An insulating plate 8 is fixed to the underside of the base plate 10. Multiple openings 8a are formed in the insulating plate 8.
[0025] A shear panel 9 is positioned below the insulating plate 8. The outer edge of the shear panel 9 is fixed to the underside of the base plate 10. The shear panel 9 is formed to cover both the insulating plate 8 and the underside of the base plate 10.
[0026] The base plate 10 is formed in a plate shape. The outer wall 11 is formed along the outer edge of the base plate 10. The outer wall 11 includes a first upright wall 15, a second upright wall 16, a third upright wall 17, and a fourth upright wall 18.
[0027] The first upright wall 15 and the second upright wall 16 are arranged in the width direction W, and the first upright wall 15 and the second upright wall 16 are formed to extend in the length direction L.
[0028] The third upright wall 17 and the fourth upright wall 18 are spaced apart in the length direction L, and are formed to extend in the width direction W. The third upright wall 17 connects one end of the first upright wall 15 to one end of the second upright wall 16, and the fourth upright wall 18 connects one end of the first upright wall 15 to one end of the second upright wall 16.
[0029] The fourth upright wall 18 is provided with respiratory membranes 9a and 9b. The respiratory membranes 9a and 9b are waterproof and breathable membranes, and for example, the respiratory membranes 9a and 9b are formed of GORE-TEX® or the like.
[0030] Partition walls 12 and 13 are located within the area enclosed by the bottom plate 10 and the outer wall 11. Partition wall 12 is positioned adjacent to the third upright wall 17 and is formed to extend in the width direction W. Partition wall 13 is positioned at a distance L in the length direction from the fourth upright wall 18. The fourth upright wall 18 is also formed to extend in the width direction W.
[0031] The insulating plate 14 is positioned on the upper surface of the bottom plate 10, between the partition walls 12 and 13. The insulating plate 14 has a plurality of openings 14a. The insulating plate 14 is provided with insulating protectors 14b that close these openings 14a.
[0032] The energy storage cells 100 are arranged on the upper surface of the insulating plate 14. The electrical equipment 5 is arranged between the partition wall 13 and the fourth upright wall 18. Multiple energy storage cells 100 are arranged with spacing in the length direction L and with spacing in the width direction W.
[0033] Figure 3 shows a perspective view of the energy storage cell 100. As shown in Figure 3, the energy storage cell 100 according to the embodiment of this disclosure is a so-called prismatic battery. The energy storage cell 100 may be a rechargeable secondary battery such as a lithium-ion battery or a nickel-metal hydride battery.
[0034] Figure 4 is an exploded perspective view of an energy storage cell according to an embodiment of the present disclosure. As shown in Figure 4, the energy storage cell 100 comprises an electrode body 101, a housing case 20, and an insulating member 70.
[0035] The electrode body 101 is a so-called wound electrode body. More specifically, the electrode body 101 includes a first tab 150A, a second tab 150B, a plurality of first electrodes (not shown), a plurality of second electrodes (not shown), and a plurality of separators (not shown). The first electrodes, second electrodes, and separators are each formed on a sheet. The first electrodes and second electrodes are stacked alternately with separators in between and are wound. The first tab 150A is connected to each of the plurality of first electrodes. The second tab 150B is connected to each of the plurality of second electrodes.
[0036] The housing case 20 is conductive. The housing case 20 is made of a metal such as aluminum. The housing case 20 houses the electrode body 101. The housing case 20 also houses an electrolyte, which is not shown in the figure. The housing case 20 includes a case body 21 and a lid 22. The lid 22 is an example of the "first end plate" of this disclosure.
[0037] The case body 21 includes a bottom wall 21a and a peripheral wall 21b that rises from the bottom wall 21a. The bottom wall 21a and the peripheral wall 21b are each formed from different materials. The bottom wall 21a is joined to the peripheral wall 21b at its outer peripheral edge.
[0038] The bottom wall 21a includes a bottom body 21aa, an exhaust valve 21ab, an outer protective film 21ac, and an inner protective film 21ad. The exhaust valve 21ab is formed in the bottom body 21aa. The outer protective film 21ac covers the exhaust valve 21ab from the outside. The inner protective film covers the exhaust valve 21ab from the inside. An opening is formed at the upper end of the peripheral wall 21b. The bottom wall 21a is an example of the "second end plate" of this disclosure.
[0039] The peripheral wall 21b rises from the base body 21aa. The peripheral wall 21b has a roughly rectangular shape when viewed from the vertical direction H. The peripheral wall 21b and the base wall 21a are aligned in the vertical direction H. The peripheral wall 21b is made of a metal such as aluminum.
[0040] The lid 22 includes a lid body 22a, a sealing plug 22b, a plug cover 22c, an insulating cover 22d, and electrode terminals 22e.
[0041] The lid body 22a is joined to the peripheral wall 21b by welding or the like so as to close the opening in the peripheral wall 21b. The lid body 22a is provided with electrode terminals 22e. The lid body 22a has a first connecting hole 22aa, a second connecting hole 22ab, and an electrolyte injection hole 22ac. The electrolyte injection hole 22ac is a through hole for injecting electrolyte into the case body 21 during the manufacturing process of the energy storage cell 100.
[0042] The sealing plug 22b seals the injection hole 22ac. The stopper cover 22c covers the injection hole 22ac and the sealing stopper 22b.
[0043] The insulating cover 22d covers the liquid injection hole 22ac, the sealing plug 22b, and the plug cover 22c.
[0044] The electrode terminal 22e includes a first external terminal 30A, a second external terminal 30B, a first connecting member 40A, a second connecting member 40B, a first sealing ring 50A, a second sealing ring 50B, a first terminal support portion 60A, and a second terminal support portion 60B.
[0045] Referring again to Figure 3, the first external terminal 30A and the second external terminal 30B are provided in the energy storage cell 100 so as to be exposed to the outside.
[0046] Referring again to Figure 4, the first connecting member 40A and the second connecting member 40B are electrically conductive. At least a portion of the first connecting member 40A and the second connecting member 40B are located inside the housing case 20.
[0047] The first external terminal 30A or the first connecting member 40A is inserted through the first connecting hole 22aa. The first external terminal 30A and the first connecting member 40A are joined to each other. The first connecting member 40A is electrically connected to the electrode body 101. Thus, the first external terminal 30A is electrically connected to the electrode body 101.
[0048] The second external terminal 30B or the second connecting member 40B is inserted through the second connecting hole 22ab. The second external terminal 30B and the second connecting member 40B are joined to each other. The second connecting member 40B is electrically connected to the electrode body 101. Thus, the second external terminal 30B is electrically connected to the electrode body 101.
[0049] The first seal ring 50A is provided along the first connecting hole 22aa. The first seal ring 50A is provided in the gap between the lid body 22a and the first external terminal 30A, and seals this gap. The second seal ring 50B is provided along the second connecting hole 22ab. The second seal ring 50B is provided in the gap between the lid body 22a and the second external terminal 30B, and seals this gap. The first seal ring 50A and the second seal ring 50B have electrical insulating properties.
[0050] The first terminal support portion 60A is locked to the lid body 22a. The first terminal support portion 60A supports the first external terminal 30A from the outer circumference of the first external terminal 30A. The first terminal support portion 60A includes a first locking ring 61A and a first covering ring 62A. The first locking ring 61A extends in an annular shape so as to surround the first connecting hole 22aa and is locked directly to the lid body 22a. The first covering ring 62A covers the first locking ring 61A. The first locking ring 61A supports the first external terminal 30A via the first covering ring 62A. The first covering ring 62A is made of an electrically insulating resin material.
[0051] The second terminal support portion 60B is locked to the lid body 22a. The second terminal support portion 60B supports the second external terminal 30B from the outer circumference of the second external terminal 30B. The second terminal support portion 60B includes a second locking ring 61B and a second covering ring 62B. The second locking ring 61B extends in an annular shape so as to surround the second connecting hole 22ab and is locked directly to the lid body 22a. The second covering ring 62B covers the second locking ring 61B. The second locking ring 61B supports the second external terminal 30B via the second covering ring 62B. The second covering ring 62B is made of an electrically insulating resin material.
[0052] The insulating member 70 has electrical insulating properties. The insulating member 70 is positioned between the electrode body 101 and the housing case 20. The insulating member 70 electrically insulates the electrode body 101 and the housing case 20 from each other. The insulating member 70 includes an insulating bracket 71, a circumferential insulating portion 72, and a bottom insulating portion 73.
[0053] The insulating bracket 71 is positioned between the electrode body 101 and the lid body 22a. The insulating bracket 71 is relatively rigid and is in contact with both the electrode body 101 and the lid body 22a. This fixes the electrode body 101 to the housing case 20 in the vertical direction H. The circumferential insulating portion 72 is positioned between the electrode body 101 and the circumferential wall 21b. The circumferential insulating portion 72 is made of a film-like material. The bottom insulating portion 73 is positioned between the electrode body 101 and the bottom wall 21a. The bottom insulating portion 73 is made of a film-like material. In this embodiment, the bottom insulating portion 73 is bonded to the electrode body 101.
[0054] As shown in Figure 4, the energy storage cell 100 according to this embodiment includes a plurality of electrode bodies 101. Typically, the energy storage cell 100 includes two electrode bodies 101. These electrode bodies 101 are arranged in the longitudinal direction L. The circumferential insulating portion 72 may integrally cover the plurality of electrode bodies 101 so that these electrode bodies 101 are fixed to each other.
[0055] Figure 5 is a cross-sectional view of the energy storage cell shown in Figure 3, viewed in the direction of the VV arrow. The peripheral wall 21b is formed to be thinner on the bottom wall 21a side than on the lid 22 side. That is, the thickness t1 of the peripheral wall 21b is thinner on the bottom wall 21a side than on the lid 22 side. More specifically, the peripheral wall 21b has an outer wall surface 21ba and an inner wall surface 21bb. The outer wall surface 21ba is formed to extend vertically H with respect to the bottom wall 21a. The inner wall surface 21bb is inclined with respect to the outer wall surface 21ba. The thickness t2 of the lid 22 is thicker than the thickness t3 of the bottom wall 21a. The thickness t1 of the peripheral wall 21b is thicker than the thickness t3 of the bottom wall 21a.
[0056] Figure 6 is a cross-sectional view of the peripheral wall shown in Figure 4, viewed in the direction of the arrow VI-VI. The peripheral wall 21b has a first side wall 21c, a second side wall 21d, a first main wall 21e, and a second main wall 21f. The first side wall 21c and the second side wall 21d are spaced apart in the width direction W. The first main wall 21e connects one end of the first side wall 21c to one end of the second side wall 21d. The second main wall 21f connects the other end of the first side wall 21c to the other end of the second side wall 21d. The first main wall 21e and the second main wall 21f are spaced apart in the length direction L.
[0057] The thickness t5 of the first main wall 21e is thinner than the thickness t4 of the first side wall 21c. Alternatively, the thickness t5 of the first main wall 21e may be less than or equal to the thickness t4 of the first side wall 21c. Furthermore, the first main wall 21e is formed such that, in the width direction W, it is thinner towards the center than towards the first side wall 21c. In the embodiments of this disclosure, the thickness t5 of the first main wall 21e is thinnest at the center in the width direction W. More specifically, the first main wall 21e has a main wall outer surface 21ea and a main wall inner surface 21eb. The main wall inner surface 21eb is located inside the case body 21 compared to the main wall outer surface 21ea. The main wall outer surface 21ea is formed flat in the width direction W. The main wall inner surface 21eb is formed to be closer to the main wall outer surface 21ea as it approaches the center in the width direction W. The thickness t5 of the first main wall 21e, which is the thinnest in the width direction W, is represented as thickness t6 in Figure 6.
[0058] Figure 7 is a cross-sectional view of the peripheral wall shown in Figure 4, viewed in the direction of the VII-VII arrow. The peripheral wall 21b is formed to be thinner on the bottom wall 21a side than on the lid 22 side. That is, the thickness t1 of the peripheral wall 21b is thinner on the bottom wall 21a side than on the lid 22 side. More specifically, the peripheral wall 21b has an outer wall surface 21ba and an inner wall surface 21bb. The outer wall surface 21ba is formed to extend in the vertical direction H relative to the bottom wall 21a. The inner wall surface 21bb is inclined with respect to the outer wall surface 21ba.
[0059] Referring again to Figure 1, in the energy storage device 2A, the energy storage cell 100 is positioned such that the lid 22 is located on the bottom 2Ba side of the vehicle 1, and the bottom wall 21a is located on the ground side.
[0060] In the embodiment of the present disclosure, the thickness t1 of the peripheral wall 21b of the energy storage cell 100 in the energy storage device 2A is thinner on the bottom wall 21a side than on the lid 22 side. An exhaust valve 21ab is provided on the bottom wall 21a. There is an air gap between the electrode body 101 and the peripheral wall 21b on the bottom wall 21a side. This ensures a path for the gas generated from the electrode body 101 housed in the energy storage cell 100 to the exhaust valve 21ab. As a result, the energy storage cell 100 can prevent gas generated inside the housing case 20 from being discharged to the outside of the housing case 20.
[0061] Furthermore, the gas generated from the electrode body 101 increases the internal pressure of the housing case 20. Since the thickness t1 of the peripheral wall 21b is thinner on the bottom wall 21a side than on the lid 22 side, the amount of deformation of the peripheral wall 21b due to the increase in internal pressure, moving outward from the center of the housing case 20, is greater on the bottom wall 21a side than on the lid 22 side. As a result, a space is created between the electrode body 101 and the peripheral wall 21b on the bottom wall 21a side, ensuring a path for the gas generated from the electrode body 101 housed in the energy storage cell 100 to the exhaust valve 21ab. Consequently, the energy storage cell 100 can prevent the gas generated inside the housing case 20 from being discharged to the outside of the housing case 20.
[0062] In the embodiment of this disclosure, the inner wall surface 21bb of the peripheral wall 21b of the energy storage cell 100 is inclined with respect to the outer wall surface 21ba. This allows for smooth insertion of the electrode body 101 into the housing case 20.
[0063] In the embodiments of this disclosure, the thickness t1 of the peripheral wall 21b of the energy storage cell 100 is greater than the thickness t3 of the bottom wall 21a at any point on the peripheral wall 21b. This prevents the peripheral wall 21b from being destroyed before the bottom wall 21a due to the increase in internal pressure of the housing case 20 caused by gas generated from the electrode body 101.
[0064] In the embodiment of the present disclosure, the thickness t5 of the first main wall 21e of the energy storage cell 100 is thinner than the thickness t4 of the first side wall 21c. This prevents the deformation of the first side wall 21c from becoming greater than the deformation of the first main wall 21e when the internal pressure in the housing case 20 increases. As a result, the contact between the electrode body 101 housed in the housing case 20 and the first side wall 21c can be maintained even when the internal pressure in the housing case 20 increases. Consequently, vibration of the electrode body 101 within the housing case 20 can be suppressed even when the internal pressure in the housing case 20 increases.
[0065] In the embodiment of the present disclosure, the first main wall 21e of the energy storage cell 100 is formed such that, in the width direction W, it is thinner in the center than on the first side wall 21c. This ensures a gap between the peripheral wall 21b and the electrode body 101 in the center of the first main wall 21e in the width direction W. In other words, a path is ensured for the gas generated in the housing case 20 to the exhaust valve 21ab. Consequently, it is possible to prevent the gas generated in the housing case 20 from being discharged to the outside of the housing case 20.
[0066] Referring to Figure 1, the energy storage device 2A is located at the bottom 2Ba of the vehicle 1. Furthermore, the energy storage cell 100 mounted on the energy storage device 2A is positioned such that the lid 22 of the energy storage cell 100 is located on the bottom 2Ba side, and the bottom wall 21a of the energy storage cell 100 is located on the ground side. This prevents the discharge of gas from the exhaust valve 21ab provided on the bottom wall 21a from being obstructed by the bottom 2Ba. It also prevents gas generated in the storage case 20 from going into the interior of the vehicle 1.
[0067] In the embodiment of the present disclosure, the thickness t3 of the bottom wall 21a of the energy storage cell 100 is thinner than the thickness t2 of the lid 22. As a result, it is possible to suppress the deformation of the bottom wall 21a due to the increase in internal pressure of the housing case 20 caused by the gas generated from the electrode body 101 from being smaller than the deformation of the lid 22. This causes the bottom wall 21a to deform due to the increase in internal pressure of the housing case 20, and the gas generated from the electrode body 101 tends to accumulate on the bottom wall 21a side. Such an energy storage cell 100 can suppress the fact that the gas generated inside the housing case 20 is not discharged to the outside of the housing case 20.
[0068] In the embodiment of the present disclosure, an exhaust valve 21ab is provided on the bottom wall 21a of the energy storage cell 100, and a first terminal support portion 60A and a second terminal support portion 60B are provided on the lid 22. This makes it possible to suppress short circuits between the first external terminal 30A and the second external terminal 30B caused by debris contained in the gas discharged from the exhaust valve 21ab. <Example 1> In the above embodiment, an example was shown in which the peripheral wall 21b of the energy storage cell 100 stands vertically from the bottom body 21aa, and the thickness t1 of the peripheral wall 21b is thinner on the bottom wall 21a side than on the lid 22 side. However, the disclosure is not limited to this. For example, the thickness t1 of the peripheral wall 21b may be uniform, and the peripheral wall 21b may stand vertically from the bottom body 21aa and be inclined toward the center of the housing case 20.
[0069] The following describes a modified version of the energy storage cell 100, which is energy storage cell 110. Note that, except for the peripheral wall 21b, the energy storage cell 110 has substantially the same configuration as the energy storage cell 100.
[0070] Figure 8 shows a modified example 1 of the energy storage cell in the embodiment of this disclosure, and is a cross-sectional view of the energy storage cell 110 at the same location as the cross-section of the energy storage cell shown in Figure 3, viewed in the direction of the VV arrow. The housing case 20 of the energy storage cell 110 includes a case body 21 and a lid 22. The case body 21 includes a bottom wall 21a and a peripheral wall 111 that rises from the bottom wall 21a. The peripheral wall 111 is formed to incline inward towards the housing case 20, starting from the end of the case body 21 on the bottom wall 21a side in the vertical direction. The thickness t7 of the peripheral wall 111 is uniform.
[0071] As a result, the electrode body 101 is pressed by the peripheral wall 111 on the lid 22 side, suppressing vibration of the electrode body 101 within the housing case 20. Consequently, the impact resistance of the energy storage cell 110 is improved. In addition, on the bottom wall 21a side, there is a gap between the peripheral wall 111 and the electrode body 101, ensuring a path for gas generated within the housing case 20 to the exhaust valve 21ab. As a result, the energy storage cell 110 can prevent gas generated within the housing case 20 from being discharged to the outside of the housing case 20. <Modification 2> In the above embodiment, an example was shown in which the inner wall surface 21bb of the energy storage cell 100 is inclined with respect to the outer wall surface 21ba, resulting in the thickness t1 of the peripheral wall 21b being thinner on the bottom wall 21a side than on the lid 22 side. However, the disclosure is not limited to this. For example, the inner wall surface 21bb may gradually approach the outer wall surface 21ba as it moves from the lid 22 side towards the bottom wall 21a side, so that the thickness t1 of the peripheral wall 21b is thinner on the bottom wall 21a side than on the lid 22 side.
[0072] The following describes a modified version of the energy storage cell 100, which is the energy storage cell 120. Note that the energy storage cell 120 has substantially the same configuration as the energy storage cell 100, except for the shape of the inner wall surface 21bb.
[0073] Figure 9 shows a modified example of the energy storage cell in this embodiment, specifically a cross-sectional view of the energy storage cell 120 at the same location as the cross-section of the energy storage cell shown in Figure 3, viewed in the direction of the VV arrow. The inner wall surface 21bb of the peripheral wall 21b of the energy storage cell 120 has a first wall surface 21bc, a second wall surface 21bd, and a third wall surface 21be. The first wall surface 21bc, the second wall surface 21bd, and the third wall surface 21be are aligned in the vertical direction H. The first wall surface 21bc and the third wall surface 21be are formed to extend in the vertical direction H. The first wall surface 21bc is located closer to the lid 22 than the third wall surface 21be. The first wall surface 21bc is positioned further away from the outer wall surface 21ba in the width direction W compared to the third wall surface 21be. The second wall surface 21bd connects one end of the first wall surface 21bc to one end of the third wall surface 21be. The thickness t1 of the peripheral wall 21b is thinner on the bottom wall 21a side than on the lid 22 side. More specifically, of the thickness t1 of the peripheral wall 21b, the thickness t9, which is the distance between the outer wall surface 21ba and the third wall surface 21be, is thinner than the thickness t8, which is the distance between the outer wall surface 21ba and the first wall surface 21bc.
[0074] In this type of energy storage cell 120, the electrode body 101 housed in the housing case 20 is pressed by the first wall surface 21bc of the inner wall surface 21bb, thereby suppressing vibration of the electrode body 101 within the housing case 20. Consequently, the impact resistance of the energy storage cell 120 is improved. Furthermore, on the bottom wall 21a side, there is a gap between the third wall surface 21be and the electrode body 101, ensuring a path for gas generated within the housing case 20 to the exhaust valve 21ab. As a result, the energy storage cell 120 can prevent gas generated within the housing case 20 from being discharged to the outside of the housing case 20. <Variation 3> In the energy storage cell 120 shown in Modification 2, an example is shown in which the inner wall surface 21bb has a first wall surface 21bc, a second wall surface 21bd, and a third wall surface 21be, but the disclosure is not limited thereto. The inner wall surface 21bb of the peripheral wall 21b may have only the second wall surface 21bd and the third wall surface 21be.
[0075] The following describes a modified version of the energy storage cell 120, which is the energy storage cell 130. Note that the energy storage cell 130 has substantially the same configuration as the energy storage cell 120, except for the shape of the inner wall surface 21bb.
[0076] Figure 10 shows a modified example of the energy storage cell in this embodiment, specifically a cross-sectional view of the energy storage cell 130 at the same location as the cross-section of the energy storage cell shown in Figure 3, viewed in the direction of the VV arrow. The inner wall surface 21bb of the peripheral wall 21b of the energy storage cell 130 has a second wall surface 21bd and a third wall surface 21be. The second wall surface 21bd and the third wall surface 21be are formed to extend in the vertical direction H, and one end of the second wall surface 21bd and one end of the third wall surface 21be are connected. That is, the second wall surface 21bd and the third wall surface 21be are aligned in the vertical direction H. The second wall surface 21bd is inclined with respect to the outer wall surface 21ba from the lid side to the bottom wall 21a side, and is also inclined to move away from the electrode body 101. The third wall surface 21be is formed to be parallel to the outer wall surface 21ba. With this configuration, of the thickness t1 of the peripheral wall 21b, the thickness t10 of the peripheral wall 21b, which is the distance between the outer wall surface 21ba and the second wall surface 21bd, becomes thinner from the lid 22 side towards the bottom wall 21a side, while the thickness t9 of the peripheral wall 21b, which is the distance between the outer wall surface 21ba and the third wall surface 21be, is a constant thickness.
[0077] In this type of energy storage cell 130, the electrode body 101 housed in the housing case 20 is pressed by the second wall surface 21bd of the inner wall surface 21bb, thereby suppressing vibration of the electrode body 101 within the housing case 20. Consequently, the impact resistance of the energy storage cell 130 is improved. Furthermore, on the bottom wall 21a side, there is a gap between the third wall surface 21be and the electrode body 101, ensuring a path for gas generated within the housing case 20 to the exhaust valve 21ab. As a result, the energy storage cell 130 can prevent gas generated within the housing case 20 from being discharged to the outside of the housing case 20. <Modification 4> The energy storage cell 130 shown in Modification 3 may further have an extension. Below, an energy storage cell 140, which is a modification of the energy storage cell 130, will be described. Note that the energy storage cell 140 has substantially the same configuration as the energy storage cell 120, except for the presence or absence of the extension 21bf.
[0078] Figure 11 shows a modified example of the energy storage cell in the embodiment of the present disclosure, and a cross-sectional view of the energy storage cell 140 at the same location as the cross-section of the energy storage cell shown in Figure 3, viewed in the direction of the VV arrow. The peripheral wall 21b of the energy storage cell 140 has an expanded portion 21bf. The expanded portion 21bf has, for example, a bellows shape. The expanded portion 21bf is located on the bottom wall 21a side of the peripheral wall 21b and is formed from an outer wall surface 21ba and a third wall surface 21be.
[0079] When gas is generated inside the housing case 20 of such a power storage cell 140, the internal pressure inside the housing case 20 rises, causing the expansion portion 21bf to expand outwards from the case body 21. This expands the gap between the third wall surface 21be on the bottom wall 21a side and the electrode body 101, securing a path for the gas generated inside the housing case 20 to the exhaust valve 21ab. As a result, the power storage cell 120 can prevent the gas generated inside the housing case 20 from being discharged to the outside of the housing case 20. <Modification 5> In the above embodiment, an example was shown in which the thickness t1 of the peripheral wall 21b of the energy storage cell 100 is thinner on the bottom wall 21a side than on the lid 22 side, but this disclosure is not limited to this. For example, the thickness t1 of the peripheral wall 21b may be uniform. Below, an example of an energy storage cell 150, which is a modified version of the energy storage cell 100, will be described. Note that the energy storage cell 150 has substantially the same configuration as the energy storage cell 100, except for the shape of the peripheral wall 21b.
[0080] Figure 12 shows a modified example of the energy storage cell in the embodiment of the present disclosure, and is a cross-sectional view of the energy storage cell 150 at the same location as the cross-section of the energy storage cell shown in Figure 3, viewed in the direction of the VV arrow. The peripheral wall 21b of the energy storage cell 150 has a first wall portion 151, a second wall portion 152, and a third wall portion 153. The first wall portion 151, the second wall portion 152, and the third wall portion 153 are aligned in the vertical direction H. The first wall portion 151 is located on the lid 22 side and on the electrode body 101 side compared to the third wall portion 153. The second wall portion 152 connects one end of the first wall portion 151 and one end of the third wall portion 153.
[0081] In such a power storage cell 150, the electrode body 101 housed in the housing case 20 is pressed by the first wall portion 151, thereby suppressing vibration of the electrode body 101 within the housing case 20. Consequently, the impact resistance of the power storage cell 150 is improved. Furthermore, on the bottom wall 21a side, there is a gap between the third wall portion 153 and the electrode body 101, ensuring a path for gas generated within the housing case 20 to the exhaust valve 21ab. As a result, the power storage cell 150 can prevent gas generated within the housing case 20 from being discharged to the outside of the housing case 20.
[0082] <Variation 6> In the above embodiment, an example was shown in which the inner wall surface 21bb of the energy storage cell 100 is inclined with respect to the outer wall surface 21ba, resulting in the thickness t1 of the peripheral wall 21b being thinner on the bottom wall 21a side than on the lid 22 side. However, the disclosure is not limited to this. For example, as the outer wall surface 21ba approaches the inner wall surface 21bb from the lid 22 side towards the bottom wall 21a side, the thickness t1 of the peripheral wall 21b may be thinner on the bottom wall 21a side than on the lid 22 side.
[0083] The following describes a modified version of the energy storage cell 100, which is the energy storage cell 160. Except for the shape of the peripheral wall 21b, the energy storage cell 160 has substantially the same configuration as the energy storage cell 100.
[0084] Figure 13 shows a modified example of the energy storage cell in the embodiment of this disclosure, and a cross-sectional view of the energy storage cell 160 at the same location as the cross-section of the energy storage cell shown in Figure 3, viewed in the direction of the VV arrow. The peripheral wall 21b of the energy storage cell 160 has an outer wall surface 21ba and an inner wall surface 21bb. The outer wall surface 21ba and the inner wall surface 21bb are formed to extend in the vertical direction H. The inner wall surface 21bb is vertically upright with respect to the bottom wall 21a. The outer wall surface 21ba is inclined from the lid 22 side toward the bottom wall 21a side so as to approach the inner wall surface 21bb. With this configuration, the thickness t1 of the peripheral wall 21b becomes thinner from the lid 22 side toward the bottom wall 21a side.
[0085] When such energy storage cells 160 are arranged in the longitudinal direction L as shown in Figure 1 and are constrained in the longitudinal direction L, the first main wall 21e and the second main wall 21f of the energy storage cell 160 deform so as to tilt toward the center of the housing case 20. As a result, the electrode body 101 is pressed by the peripheral wall 21b on the lid 22 side, and vibration of the electrode body 101 within the housing case 20 is suppressed. Consequently, the impact resistance of the energy storage cell 160 is improved. In addition, a gap is created between the peripheral wall 21b and the electrode body 101 on the bottom wall 21a side, ensuring a path for gas generated within the housing case 20 to the exhaust valve 21ab. As a result, the energy storage cell 160 can suppress the fact that gas generated within the housing case 20 is not discharged to the outside of the housing case 20. <Example 7> In the above embodiment, an example was shown in which the thickness t1 of the peripheral wall 21b of the energy storage cell 100 is thinner on the bottom wall 21a side than on the lid 22 side, but the disclosure is not limited to this. For example, the thickness t1 of the peripheral wall 21b may be uniform, and there may be a protrusion 21bh on a part of the inner wall surface 21bb.
[0086] The following describes a modified version of the energy storage cell 100, which is energy storage cell 170. Except for the shape of the peripheral wall 21b, the energy storage cell 170 has substantially the same configuration as the energy storage cell 100.
[0087] Figure 14 shows a modified example of the energy storage cell in the embodiment of this disclosure, and is a cross-sectional view of the energy storage cell 170 at the same location as the cross-section of the energy storage cell shown in Figure 3, viewed in the direction of the VV arrow. The peripheral wall 21b of the energy storage cell 170 has an outer wall surface 21ba and an inner wall surface 21bb. The inner wall surface 21bb has a flat portion 21bg and a convex portion 21bh. The convex portion 21bh protrudes toward the electrode body 101 with respect to the flat portion 21bg. In the vertical direction H, the convex portion 21bh is located on the lid 22 side of the bottom wall 21a.
[0088] In such a power storage cell 170, the electrode body 101 housed in the housing case 20 is pressed by the protrusion 21bh, suppressing vibration of the electrode body 101 within the housing case 20. Consequently, the impact resistance of the power storage cell 170 is improved. Furthermore, on the bottom wall 21a side, there is a gap between the flat portion 21bg and the electrode body 101, ensuring a path for gas generated within the housing case 20 to the exhaust valve 21ab. As a result, the power storage cell 170 can prevent gas generated within the housing case 20 from being discharged to the outside of the housing case 20. <Differentiation Example 8> In Modification 7, the electrode body 101 of the energy storage cell 170 is shown as being pressed by a protrusion 21bh, but the disclosure is not limited thereto. For example, the electrode body 101 may be pressed by a bent portion 181 of the peripheral wall 21b.
[0089] The following describes a modified version of the energy storage cell 170, which is the energy storage cell 180. Except for the shape of the peripheral wall 21b, the energy storage cell 180 has substantially the same configuration as the energy storage cell 170.
[0090] Figure 15 shows a modified example of the energy storage cell in the embodiment of this disclosure, specifically a cross-sectional view of the energy storage cell 180 at the same location as the cross-section of the energy storage cell shown in Figure 3, viewed in the direction of the VV arrow. The thickness t1 of the peripheral wall 21b of the energy storage cell 180 is uniform. The peripheral wall 21b also has a bent portion 181 on the lid 22 side in the vertical direction H, compared to the bottom wall 21a. The bent portion 181 is formed by bending a part of the peripheral wall 21b, which is formed to a uniform thickness, by pushing it toward the electrode body 101 side relative to the case body 21.
[0091] In such a power storage cell 180, the electrode body 101 housed in the housing case 20 is pressed by the bent portion 181, suppressing vibration of the electrode body 101 within the housing case 20. Consequently, the impact resistance of the power storage cell 180 is improved. Furthermore, on the bottom wall 21a side, there is a gap between the peripheral wall 21b and the electrode body 101, ensuring a path for gas generated within the housing case 20 to the exhaust valve 21ab. As a result, the power storage cell 180 can prevent gas generated within the housing case 20 from being discharged to the outside of the housing case 20. <Modification 9> The peripheral wall 21b of the energy storage cell 180 shown in Modification 8 has a bent portion 181 on the lid 22 side in the vertical direction H, compared to the bottom wall 21a, but the disclosure is not limited to this. For example, as shown in Figure 16, the bent portion 181 may be at the lid 22 side end of the peripheral wall 21b in the vertical direction H. Figure 16 is a modified example of the energy storage cell in the embodiment of the disclosure, and is a cross-sectional view of the energy storage cell 190 at the same location as the cross-section of the energy storage cell shown in Figure 3, viewed in the direction of the VV arrow. The energy storage cell 190 has substantially the same configuration as the energy storage cell 180, except for the position of the bent portion 181.
[0092] In the energy storage cell 190, the bent portion 181 is located at the end of the peripheral wall 21b on the lid 22 side, so that the bent portion 181 comes into contact with the corner of the electrode body 101. As a result, the bent portion 181 can press the electrode body 101 in the vertical direction H and also press the side of the electrode body 101. <Variation 10> A storage cell 200 having a modified version of the bent portion 181 of the storage cell 190 shown in Modification 9 will be described. Note that the storage cell 200 has substantially the same configuration as the storage cell 190, except for the shape of the peripheral wall 21b.
[0093] Figure 17 shows a modified example of the energy storage cell in the embodiment of this disclosure, and is a cross-sectional view of the energy storage cell 200 at the same location as the cross-section of the energy storage cell shown in Figure 3, viewed in the direction of the VV arrow. The peripheral wall 21b has a fourth wall portion 201, a fifth wall portion 202, and a sixth wall portion 203. The fourth wall portion 201, the fifth wall portion 202, and the sixth wall portion 203 are arranged in the vertical direction H. The fifth wall portion 202 is located on the lid 22 side and on the electrode body 101 side relative to the sixth wall portion 203. The fifth wall portion 202 connects one end of the fourth wall portion 201 and one end of the sixth wall portion 203 and is formed in an arc.
[0094] The fifth wall portion 202 in the energy storage cell 200 performs the same function as the bent portion 181 of the energy storage cell 190. That is, the fifth wall portion 202 of the peripheral wall 21b in the energy storage cell 200 contacts the corner of the electrode body 101. As a result, the fifth wall portion 202 can press the electrode body 101 in the vertical direction H and also press the side of the electrode body 101. <Variation 11> In the above embodiment, an example was shown in which the thickness t1 of the peripheral wall 21b of the energy storage cell 100 is thinner on the bottom wall 21a side than on the lid 22 side, thereby ensuring a path for gas generated in the housing case 20 to the exhaust valve 21ab. However, the disclosure is not limited to this. For example, a smoke exhaust passage may be formed in at least one of the first side wall 21c or the second side wall 21d, and the smoke exhaust passage may ensure a path for gas generated in the housing case 20 to the exhaust valve 21ab.
[0095] The following describes a modified version of the energy storage cell 100, which is the energy storage cell 210. Note that the energy storage cell 210 has substantially the same configuration as the energy storage cell 100, except for the peripheral wall 21b.
[0096] Figure 18 shows a perspective view of the peripheral wall of a storage cell 210 according to a modified example 11 of the storage cell in the embodiment of the present disclosure. The peripheral wall 21b has a first side wall 21c, a second side wall 21d, a first main wall 21e, and a second main wall 21f. The first side wall 21c has a first smoke exhaust passage 211. The second side wall 21d has a second smoke exhaust passage 212. The first smoke exhaust passage 211 and the second smoke exhaust passage 212 are each formed to extend in the vertical direction H.
[0097] Figure 19 shows a cross-sectional view of the peripheral wall shown in Figure 18, viewed in the direction of the XIX-XIX arrow. Since the first smoke exhaust passage 211 and the second smoke exhaust passage 212 have substantially the same configuration, the details of the first smoke exhaust passage 211 will be explained below, and the explanation of the second smoke exhaust passage 212 will be omitted. The first side wall 21c has an outer side wall surface 21ca and an inner side wall surface 21cb. The inner side wall surface 21cb has a flat surface 21cc and a concave surface 21cd. The concave surface 21cd protrudes toward the outer side wall surface 21ca with respect to the flat surface 21cc. The concave surface 21cd formed in this way defines the first smoke exhaust passage 211.
[0098] Referring again to Figure 18, the first exhaust passage 211 is formed from the lid 22 side to the bottom wall 21a side. Gas generated in the housing case 20 of the energy storage cell 210 having such a first exhaust passage 211 can pass through the first exhaust passage 211 and reach the exhaust valve 21ab. In other words, the energy storage cell 210 can prevent gas generated in the housing case 20 from being discharged to the outside of the housing case 20. <Variation 12> For example, the bottom body 21aa shown in Figure 4 according to the embodiment of this disclosure may have a protrusion formed thereon. A modified example of the bottom body 21aa of the energy storage cell 100, the bottom body 21ae, will be described below.
[0099] Figure 20 is a plan view of a modified example of the bottom body in an embodiment of the present disclosure. Figure 20 is a plan view of the bottom body 21ae viewed from the lid 22 side in the vertical direction. The bottom body 21ae has a first projection 21af, a second projection 21ag, a third projection 21ah, and a fourth projection 21ai. The first projection 21af and the second projection 21ag are formed in the center of the length direction L of the bottom body 21ae and extend in the width direction W. The third projection 21ah and the fourth projection 21ai are formed in the center of the width direction W of the bottom body 21ae and extend in the length direction L.
[0100] Figure 21 shows a cross-sectional view of the bottom body 21ae shown in Figure 20, viewed in the direction of the arrow XXI-XXI. The first projection 21af protrudes in the vertical direction H from the bottom wall 21a side toward the lid 22 side. The second projection 21ag, the third projection 21ah, and the fourth projection 21ai also have the same configuration as the first projection 21af.
[0101] The bottom body 21ae has a first projection 21af, a second projection 21ag, a third projection 21ah, and a fourth projection 21ai. When the internal pressure inside the housing case 20 of the energy storage cell 100 rises due to gas generated inside the housing case 20, such a bottom body 21ae can suppress deformation of the bottom body from the inside to the outside of the housing case 20 compared to a bottom body 21aa that is formed in a flat plate shape. As a result, it is possible to suppress the exhaust valve 21ab from rupturing at a pressure below the designed pressure. <Example 13> For example, the bottom body 21aa shown in Figure 4 according to the embodiment of this disclosure may have a tensioned portion. A modified example of the bottom body 21aa of the energy storage cell 100, the bottom body 21aj, will be described below.
[0102] Figure 22 is a plan view of a modified example of the bottom body in the embodiment of the present disclosure. Figure 22 is a plan view of the bottom body 21aj viewed from the lid 22 side in the vertical direction. The bottom body 21aj has a tensioned portion 21ak, a connecting portion 21al, and a flat portion 21am. The exhaust valve 21ab of the bottom body 21aj is provided in the tensioned portion 21ak.
[0103] Figure 23 shows a cross-sectional view of the bottom body 21aj shown in Figure 22, viewed in the direction of the arrow XXIII-XXIII. The tensioned portion 21ak is located on the lid 22 side in the vertical direction H compared to the flat portion 21am. The flat portion 21am is formed to surround the tensioned portion 21ak. The connecting portion 21al connects one end of the flat portion 21am to one end of the tensioned portion 21ak.
[0104] The bottom body 21aj has a taut portion 21ak, on which the exhaust valve 21ab is provided, which protrudes toward the lid 22 side more than the flat portion 21am. When the internal pressure inside the housing case 20 rises due to gas generated inside the housing case 20 of the energy storage cell 100, such a bottom body 21aj can suppress deformation of the bottom body from the inside to the outside of the housing case 20 compared to a bottom body 21aa that is formed in a flat plate shape. As a result, it is possible to suppress the exhaust valve 21ab from rupturing below the designed pressure. <Example 14> For example, the bottom body 21aa shown in Figure 4 according to the embodiment of this disclosure may have a reinforcing member. A modified example of the bottom body 21aa of the energy storage cell 100, the bottom body 21an, will be described below.
[0105] Figure 24 is a plan view of a modified example of the bottom body in an embodiment of the present disclosure. Figure 24 is a plan view of the bottom body 21an viewed from the lid 22 side in the vertical direction. Figure 25 shows a cross-sectional view of the bottom body 21an shown in Figure 24 viewed in the direction of the arrows XXV-XXV. Referring to Figure 24, the bottom body 21an has a plurality of first reinforcing members 21ao formed to extend in the width direction W and a plurality of second reinforcing members 21ap formed to extend in the length direction L. Referring to Figure 25, the first reinforcing members 21ao and the second reinforcing members 21ap are formed to protrude from the flat portion 21aq of the bottom body 21an toward the lid 22 side.
[0106] The bottom body 21an has a first reinforcing member 21ao and a second reinforcing member 21ap. When the internal pressure inside the housing case 20 of the energy storage cell 100 rises due to gas generated inside the housing case 20, such a bottom body 21an can suppress deformation of the bottom body from the inside to the outside of the housing case 20 compared to a bottom body 21aa that is formed in a flat plate shape. As a result, it is possible to suppress the exhaust valve 21ab from rupturing at a pressure below the designed pressure.
[0107] While embodiments of this disclosure have been described above, the embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The technical scope provided herein is defined by the claims and is intended to include all modifications within the meaning and scope of the claims. [Explanation of Symbols]
[0108] 1 Vehicle, 2A Energy storage device, 2B Vehicle body, 2Ba Bottom, 3 Storage case, 5 Electrical equipment, 6 Lower case, 7 Upper case, 8 Insulation plate, 8a Opening, 9 Share panel, 9a,9b Breathing membrane, 9a Breathing membrane, 9b Breathing membrane, 10 Bottom plate, 10a Opening, 11 Outer wall, 12,13 Bulkhead, 12,13 Partition wall, 14 Insulating plate, 14a Opening, 14b Insulating protector, 15 First upright wall, 16 Second upright wall, 17 Third upright wall, 18 Fourth upright wall, 20 Housing case, 21 Case body, 21a Bottom wall, 21aa Bottom body, 21ab Exhaust valve, 21ac Outer protective film, 21ad Inner protective film, 21ae Bottom body, 21af First protrusion, 21ag Second protrusion, 21ah Third protrusion, 21ai Fourth protrusion, 21aj Bottom body, 21ak Tension section, 21al Connection section, 21am Flat section, 21an Bottom body, 21ao First reinforcing member, 21ap Second reinforcing member, 21aq Flat section, 21b Peripheral wall, 21ba Outer wall surface, 21bb Inner wall surface, 21bc First wall surface, 21bd 21be Second wall surface, 21bf Third wall surface, 21bg Expanded section, 21bg Flat section, 21bh Convex section, 21c First side wall, 21ca Outer side wall surface, 21cb Inner side wall surface, 21cc Flat surface, 21cd Concave surface, 21d Second side wall, 21e First main wall, 21ea Outer main wall surface, 21eb Inner main wall surface, 21f Second main wall, 22 Lid, 22a Lid body, 22aa First connecting hole, 22ab Second connecting hole, 22ac Injection hole, 22b Sealing plug, 22c Plug cover, 22d Insulating cover, 22e Electrode terminal, 30A First external terminal, 30B Second external terminal, 40A First connecting member, 40B Second connecting member, 50A First sealing ring, 50B Second sealing ring, 60A First terminal support section, 60B Second terminal support part, 61A First locking ring, 61B Second locking ring, 62A First covering ring, 62B Second covering ring, 70 Insulating member, 71 Insulating bracket, 72 Peripheral insulating part, 73 Bottom insulating part, 100 Energy storage cell, 101 Electrode body, 110 Energy storage cell, 111 Peripheral wall, 120 Energy storage cell, 130 Energy storage cell, 140 Energy storage cell, 150 Energy storage cell, 150A First tab, 150B Second tab, 151 First wall part, 152 Second wall part, 153 Third wall part, 160 Energy storage cell, 170 Energy storage cell, 180 Energy storage cell, 181 Bent part, 190 Energy storage cell, 200 Energy storage cell, 201 Fourth wall part, 202 Fifth wall part, 203 Sixth wall part, 210 Energy storage cell, 211 first exhaust duct, 212 second exhaust duct.
Claims
1. Electrode body and A housing case for housing the electrode body, The housing case comprises an exhaust valve formed in the aforementioned housing case, The housing case includes a first end plate, a second end plate, and a peripheral wall provided between the first end plate and the second end plate. The peripheral wall is formed such that it is thinner on the second end plate side than on the first end plate side. The exhaust valve is a power storage device formed on the second end plate.
2. The aforementioned peripheral wall has an outer wall surface and an inner wall surface. The energy storage device according to claim 1, wherein the inner wall surface is inclined with respect to the outer wall surface.
3. The energy storage device according to claim 1 or claim 2, wherein the thickness of the peripheral wall is greater than the thickness of the second end plate.
4. The aforementioned peripheral wall comprises a first side wall, a second side wall, a first main wall, and a second main wall. The first side wall and the second side wall are arranged with a gap between them in the width direction. The first main wall connects one end of the first side wall and one end of the second side wall. The second main wall connects the other end of the first side wall to the other end of the second side wall. The energy storage device according to claim 1 or claim 2, wherein the thickness of the first main wall is thinner than the thickness of the first side wall.
5. The aforementioned peripheral wall comprises a first side wall, a second side wall, a first main wall, and a second main wall. The first side wall and the second side wall are arranged with a gap between them in the width direction. The first main wall connects one end of the first side wall and one end of the second side wall. The second main wall connects the other end of the first side wall to the other end of the second side wall. The energy storage device according to claim 1 or claim 2, wherein the first main wall is formed such that it is thinner in the width direction towards the center than towards the first side wall.
6. The aforementioned energy storage device is located at the bottom of the vehicle. The energy storage device according to claim 1 or claim 2, wherein the first end plate is positioned on the bottom side of the vehicle and the second end plate is positioned on the ground side.
7. The energy storage device according to claim 1 or claim 2, wherein the first end plate is formed to be thicker than the second end plate.
8. The energy storage device according to claim 1 or claim 2, wherein the first end plate is provided with electrode terminals.
9. The energy storage device according to claim 1 or claim 2, wherein the second end plate and the peripheral wall are each formed from a different material.
10. Electrode body and A housing case for housing the electrode body, The housing case comprises an exhaust valve formed in the aforementioned housing case, The housing case includes a first end plate, a second end plate, and a peripheral wall provided between the first end plate and the second end plate. The peripheral wall is formed to rise from the second end plate and to incline toward the inside of the housing case. The exhaust valve is a power storage device formed on the second end plate.