Energy storage device

Abstract

The present invention relates to an energy storage device, comprising: a module housing in which a plurality of accommodating spaces are formed; the plurality of bare cells are respectively accommodated in the plurality of accommodating spaces; a cover coupled to the module case; and a coupling part that couples the module case and the cover. The module shell is in direct contact with the plurality of bare cells accommodated in the plurality of accommodating spaces so as to support the plurality of bare cells; the cover includes: a cover main body coupled to the module case to cover the plurality of accommodating spaces; an outer wall member protruding from a cover-facing surface of the cover main body facing the module housing toward a first direction side of the module housing; and an inner wall member that protrudes from the cover-facing surface toward the first direction side and is disposed apart from the outer wall member. The coupling portion includes a first coupling member disposed between the outer wall member and the inner wall member to couple the module case and the cover.

Description

Technical Field

[0001] The invention relates to an energy storage device for storing energy such as electric energy. Background Art

[0002] Batteries and capacitors are typical energy storage devices for storing electrical energy. Among these capacitors, ultracapacitors (UC) are emerging as energy storage devices that have high efficiency, semi-permanent life, and fast charge and discharge characteristics, and can make up for the short cycle and instantaneous high voltage problems of secondary batteries.

[0003] Based on these advantages, supercapacitors are not only used as auxiliary power sources for mobile devices such as mobile phones, tablets, and laptops, but are also widely used as main power sources or auxiliary power sources for electric vehicles, hybrid vehicles, solar cell power supply devices, nighttime road lights, and uninterrupted power supplies (UPS) that require large capacity.

[0004] Figure 1 It is a conceptual top view of a sectional view of an energy storage device in the prior art.

[0005] Reference Figure 1 The energy storage device 100 of the prior art includes: a plurality of bare cells 110; a plurality of battery casings 120 for respectively accommodating the plurality of bare cells 110; and a module casing 130 for accommodating the plurality of battery casings 120.

[0006] The plurality of bare cells 110 may be respectively received in the plurality of battery cases 120. The plurality of battery cases 120 receiving the plurality of bare cells 110 may be received in the module case 130. Thus, the energy storage device 100 of the prior art may be modularized in a state where the plurality of battery cases 120 receive the plurality of bare cells 110.

[0007] Here, as the number of the plurality of bare cells 110 housed in the module housing 130 increases, the energy density increases. A problem with the energy storage device 100 in the prior art is that the volume occupied by the plurality of battery housings 120 inside the module housing 130 acts as a dead space, making it difficult to increase the energy density. Summary of the invention

[0008] Problems to be solved by the invention

[0009] The present invention is proposed to solve the above-mentioned problem, and provides an energy storage device capable of preventing a decrease in energy density caused by a plurality of battery cases accommodating a plurality of bare cells.

[0010] Technical solutions to the problem

[0011] In order to solve the above-mentioned problems, the present invention may include the following configurations.

[0012] The energy storage device of the present invention may include: a module housing having a plurality of accommodation spaces; a plurality of bare cells respectively accommodated in the plurality of accommodation spaces; a cover coupled to the module housing; and a coupling portion coupling the module housing and the cover. The module housing may directly contact the plurality of bare cells accommodated in the plurality of accommodation spaces to support the plurality of bare cells.

[0013] In the energy storage device of the present invention, the cover may include: a cover body, which is combined with the module shell to cover a plurality of the accommodating spaces; an outer wall member, which protrudes from the cover facing the module shell of the cover body to a first direction side toward the module shell; and an inner wall member, which protrudes from the cover facing the module shell to the first direction side and is configured to be separated from the outer wall member.

[0014] In the energy storage device of the present invention, the coupling portion may include a first coupling member disposed between the outer wall member and the inner wall member to couple the module housing and the cover.

[0015] Effects of the Invention

[0016] According to the present invention, the following effects can be obtained.

[0017] The present invention can be implemented such that the bare cell is directly supported by the module housing without the battery housing. Thus, the present invention can use the volume occupied by the battery housing inside the module housing as a space for accommodating the bare cell. Therefore, the present invention can improve the energy density by increasing the volume of the bare cell.

[0018] The present invention can limit the distance that the first combination member can flow by using the inner wall member and the outer wall member. Thus, the present invention can firmly maintain the state of the first combination member combining the cover and the module housing. Therefore, the present invention increases the pressure resistance by increasing the bonding force generated by the first combination member, thereby improving the pressure resistance performance and explosion-proof performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a conceptual top view of a sectional view of an energy storage device in the prior art.

[0020] Figure 2 It is a schematic three-dimensional diagram of the energy storage device of the present invention.

[0021] Figure 3It is a schematic exploded perspective view of the energy storage device of the present invention.

[0022] Figure 4 It is a conceptual diagram for explaining a bare cell in the energy storage device of the present invention.

[0023] Figure 5 So Figure 2 A schematic exploded cross-sectional view of the energy storage device of the present invention is shown with line II' as a reference.

[0024] Figure 6 It is a schematic bottom perspective view of a cover in the energy storage device of the present invention.

[0025] Figure 7 So Figure 2 A schematic combined cross-sectional view of the energy storage device of the present invention is shown with line II' as a reference.

[0026] Figure 8 It is a schematic top view of a module case in the energy storage device of the present invention.

[0027] Fig. 9 It is a schematic bottom view of the cover in the energy storage device of the present invention.

[0028] Fig.10 So Figure 2 This is a schematic exploded cross-sectional view showing an enlarged arrangement relationship among the outer wall member, the inner wall member, and the connecting portion, with the II' line as a reference.

[0029] Fig.11 and Fig.12 This is a conceptual diagram showing the arrangement relationship among the outer wall member, the inner wall member, and the joint part in an enlarged manner based on the bottom view of the cover in the energy storage device of the present invention.

[0030] Fig.13 So Figure 2 An enlarged cross-sectional view of a portion of a cover in the energy storage device of the present invention is shown with line II' as a reference.

[0031] Fig.14 It is a schematic top view of the energy storage device of the present invention.

[0032] Fig.15 So Fig.14 The II-II' line is used as a reference to show an enlarged cross-sectional view of the energy storage device of the present invention in which an internal terminal and a first external terminal are connected to one side of the bare cell, and an internal terminal and a bus bar are connected to the other side of the bare cell.

[0033] Fig.16 It is an exploded perspective view of a plurality of bare cells, a plurality of internal terminals, a plurality of external terminals, and a plurality of bus bars in the energy storage device of the present invention. DETAILED DESCRIPTION

[0034] The following describes in detail the embodiments of the energy storage device of the present invention with reference to the accompanying drawings. Fig.11 , Fig.12 , Figures 14 to 16 In , two parallel dot-dash lines are ellipsis lines. Fig.11 and Fig.12 , the configuration of the joint portion when the cover and the module case are joined is conceptually shown with reference to the bottom view of the cover.

[0035] Reference Figure 2 and Figure 3 The energy storage device 1 of the present invention is used to store electric energy. The energy storage device 1 of the present invention can be realized by modularizing a plurality of ultra-capacitors (UC). The energy storage device 1 of the present invention can include a bare cell 2, a module housing 3 and a cover 4.

[0036] Reference Figures 2 to 4 The bare cell 2 is received in the module housing 3. The bare cell 2 may be referred to as an electrode element and may refer to an electrode element that is not combined with the battery housing 120 ( Figure 1 The bare cell 2 can be used without the battery housing 120 ( Figure 1 Thus, the energy storage device 1 of the present invention is implemented such that the battery housing 120 ( Figure 1 The volume occupied by the module housing 3 (shown in FIG. 1 ) is used as a space for accommodating the bare cell 2, so the energy density can be further improved by increasing the volume of the bare cell 2.

[0037] The bare cell 2 may be formed by winding a first electrode 21, a second electrode 22 having a polarity opposite to that of the first electrode 21, and a separator 23 disposed between the first electrode 21 and the second electrode 22 to electrically separate the first electrode 21 and the second electrode 22. In one embodiment, if the first electrode 21 is a positive electrode +, the second electrode 22 is a negative electrode -. On the contrary, if the first electrode 21 is a negative electrode -, the second electrode 22 is a positive electrode +. The bare cell 2 may be wound in the order of the separator 23, the first electrode 21, the separator 23, and the second electrode 22. The bare cell 2 may also be wound in the order of the separator 23, the second electrode 22, the separator 23, and the first electrode 21.

[0038] The first electrode 21 may include: a first active material layer 211 formed on a metal current collector (not shown) using activated carbon; and a first electrode lead 212 connected to one side of the first active material layer 211. In this case, the first electrode lead 212 is formed by a region on the current collector where the first active material layer 211 is not formed.

[0039] The second electrode 22 may include: a second active material layer 221 formed on a metal current collector (not shown) using activated carbon; and a second electrode lead 222 connected to one side of the second active material layer 221. In this case, the second electrode lead 222 is formed by a region on the current collector where the second active material layer 221 is not formed.

[0040] In the above-mentioned embodiment, a metal foil (Foil) can be used to form the collector for forming the first electrode 21 and the second electrode 22. The collector acts as a charge migration channel for the charges released from or supplied to the first active material layer 211 and the second active material layer 221. The first active material layer 211 and the second active material layer 221 are coated on both sides of the collector. The first active material layer 211 and the second active material layer 221 are parts for storing electric energy.

[0041] In one embodiment, the first electrode 21 and the second electrode 22 may be wound such that the first electrode lead 212 is located on the upper side of the bare cell 2 , and the second electrode lead 222 is located on the lower side of the bare cell 2 .

[0042] On the other hand, the bare cell 2 may be impregnated with an electrolyte for charging electric energy. In this case, the process of impregnating the bare cell 2 with the electrolyte may be performed by immersing the bare cell 2 in a container filled with the electrolyte for a predetermined time. The process of impregnating the bare cell 2 with the electrolyte may also be performed in a state where the bare cell 2 is accommodated in the module housing 3.

[0043] Reference Figures 2 to 5 , the module housing 3 is used to accommodate the bare cell 2. A receiving space 31 may be formed in the module housing 3. The bare cell 2 is received in the receiving space 31, and thus can be received inside the module housing 3. The receiving space 31 may be realized by a groove formed at a predetermined depth from the top surface of the module housing 3. The module housing 3 is in direct contact with the bare cell 2 received in the receiving space 31, and thus can support the bare cell 2. That is, the bare cell 2 can be directly supported by the module housing 3 without the battery housing 120 ( Figure 1 Thus, the energy storage device 1 of the present invention is implemented as follows: the battery housing 120 ( Figure 1 The volume occupied by the housing 31 is used as at least one of a space for accommodating the bare cell 2 and a hollow space. Therefore, the energy storage device 1 of the present invention is implemented so that at least one of an increase in energy density can be achieved by increasing the volume of the hollow space in the accommodating space 31 and increasing the volume of the bare cell 2.

[0044] A plurality of the accommodation spaces 31 may be formed in the module housing 3. The plurality of accommodation spaces 31 may be spaced apart from each other along the first axis direction (X axis direction). The plurality of bare cells 2 are respectively received in the plurality of accommodation spaces 31, so that they may be spaced apart from each other along the first axis direction (X axis direction). In this case, the module housing 3 is in direct contact with the plurality of bare cells 2 respectively received in the plurality of accommodation spaces 31, so that the plurality of bare cells 2 may be supported. Figure 3 FIG. 2 shows that three accommodating spaces 31 are formed in the module housing 3 , but the present invention is not limited thereto. Two or more than four accommodating spaces 31 may also be formed in the module housing 3 .

[0045] The module case 3 may include a module body 30 formed with the accommodation space 31. The module body 30 constitutes the overall appearance of the module case 3. The module body 30 may include a bottom member 32, a side wall member 33, and a partition wall member 34.

[0046] The bottom member 32 is disposed at the lower side of the plurality of accommodation spaces 31. The bottom member 32 may have a supporting force for supporting the plurality of bare cells 2 accommodated in the plurality of accommodation spaces 31. The bottom member 32 is formed in a quadrilateral plate shape as a whole and may be disposed horizontally.

[0047] The side wall member 33 protrudes upward from the outer side surface of the bottom member 32. The module housing 3 may include a plurality of the side wall members 33. The plurality of side wall members 33 may protrude upward from different sides of the bottom member 32. In this case, the plurality of accommodating spaces 31 may be arranged inside the plurality of side wall members 33. The side wall member 33 is formed in a quadrilateral plate shape as a whole, and may be arranged upright in the up-down direction.

[0048] The partition wall member 34 is used to separate the plurality of the storage spaces 31. The partition wall member 34 may protrude upward from the bottom member 32 between the plurality of the side wall members 33. Thus, the partition wall member 34 may be arranged between the plurality of the storage spaces 31. In this case, the partition wall member 34 may be arranged between the plurality of the storage spaces 31 based on the first axis direction (X axis direction). The module housing 3 may include at least one partition wall member 34. Assuming that the number of the storage spaces 31 is N (N is an integer greater than 1), the module housing 3 may include N-1 partition wall members 34. In the case where there are a plurality of the partition wall members 34, the plurality of the partition wall members 34 may be arranged to be separated from each other along the first axis direction (X axis direction). The partition wall member 34 is formed as a quadrilateral plate as a whole and may be arranged upright along the up and down direction.

[0049] The partition wall member 34, the plurality of side wall members 33 and the bottom member 32 may also be formed integrally. In this case, the partition wall member 34, the plurality of side wall members 33 and the bottom member 32 may be formed integrally by injection molding.

[0050] Reference Figures 2 to 7 The cover 4 is used to be combined with the module housing 3. The cover 4 is combined with the module housing 3, so as to cover the plurality of accommodation spaces 31. Thus, the plurality of accommodation spaces 31 can be separated from each other in space.

[0051] The cover 4 and the module housing 3 may be formed of a material that does not react with the electrolyte immersed in the plurality of bare cells 2, such as a material with low conductivity. This is to ensure that the plurality of bare cells 2 can be used without the battery housing 120 ( Figure 1 The cover 4 and the module housing 3 are stored in the plurality of the accommodation spaces 31 in a state shown in FIG. 1 , thereby preventing a short circuit or other malfunction when the electrolyte leaks from the plurality of the bare cells 2. For example, the cover 4 and the module housing 3 may be formed of a plastic material. Thus, even if the electrolyte leaks from the plurality of the bare cells 2, the cover 4 and the module housing 3 can prevent a short circuit or other malfunction. The cover 4 and the module housing 3 are formed of a plastic material and may be combined with each other.

[0052] The cover 4 and the module housing 3 may also be formed of the same material. The cover 4 and the module housing 3 may be formed of polyamide. The cover 4 and the module housing 3 may also be formed of at least one of nylon resin (ZYTEL), MINLON, DELRIN, CRASTIN, RYNITE, engineering thermoplastic vulcanized rubber (ETPV), and SORONA of DuPont.

[0053] The cover 4 may include a cover body 41 .

[0054] The cover body 41 is used to cover the plurality of the accommodation spaces 31. When the cover 4 is combined with the module housing 3, the cover body 41 is arranged on the upper side of the module housing 3 and can cover the plurality of the accommodation spaces 31. The cover body 41 can be combined with the module housing 3 so that the cover facing surface 411 faces the module housing 3. In this case, the cover facing surface 411 can be arranged to face the first direction (FD arrow direction). The first direction (FD arrow direction) can be the direction from the cover 4 to the module housing 3. The cover outer surface 412 arranged on the opposite side of the cover facing surface 411 can be arranged to face the second direction (SD arrow direction). The second direction (SD arrow direction) and the first direction (FD arrow direction) can be parallel to the up and down direction and opposite to each other. In this case, the cover facing surface 411 can be equivalent to the bottom surface of the cover body 41, and the cover outer surface 412 can be equivalent to the top surface of the cover body 41. The cover body 41 is formed as a quadrilateral plate as a whole and can be arranged horizontally along the horizontal direction.

[0055] The cover 4 may include a plurality of partition members 42 .

[0056] The plurality of partition members 42 protrude from the cover body 41. The plurality of partition members 42 may protrude from the cover facing surface 411 toward the first direction (FD arrow direction). When the cover 4 and the module housing 3 are combined, the plurality of partition members 42 may be inserted into the plurality of accommodation spaces 31. Thus, the plurality of partition members 42 may support the plurality of bare cells 2 so that the plurality of bare cells 2 accommodated in the accommodation space 31 are arranged at a position separated from the cover body 41. Therefore, the energy storage device 1 of the present invention may utilize the plurality of partition members 42 to ensure additional space between the plurality of bare cells 2 and the cover body 41. Thus, when gravity acts on the side of the cover 4, as in the case where the cover 4 is turned over to be arranged on the lower side of the module housing 3, the energy storage device 1 of the present invention is implemented so that even if the electrolyte leaks from the plurality of bare cells 2, the leaked electrolyte can be accommodated by using the space between the plurality of bare cells 2 and the cover body 41. Therefore, the energy storage device 1 of the present invention can reduce the risk of short circuits and the like caused by the electrolyte leaking from the plurality of bare cells 2, thereby improving product reliability and safety. The plurality of partition members 42 and the cover body 41 can also be formed integrally.

[0057] The cover 4 can be implemented as a plurality of partition members 42 inserted into each of the accommodating spaces 31. The plurality of partition members 42 inserted into each of the accommodating spaces 31 can be spaced apart from each other along a second axis direction (Y axis direction) perpendicular to the first axis direction (X axis direction). Thus, in each of the accommodating spaces 31, the plurality of partition members 42 can support different parts of the bare cell 2. Therefore, the energy storage device 1 of the present invention can utilize the plurality of partition members 42 to reduce shaking, vibration, etc. generated on the plurality of bare cells 2, thereby improving the stability of the plurality of bare cells 2.

[0058] The cover 4 may include a plurality of separation grooves 43 .

[0059] A plurality of the partition grooves 43 are formed in each of the partition members 42. The plurality of the partition grooves 43 may be formed on one side of the plurality of partition members 42 facing the first direction (FD arrow direction). The plurality of the partition grooves 43 may be implemented as grooves (Groove) formed with a predetermined depth on one side of the plurality of the partition members 42. When the cover 4 and the module housing 3 are combined, a portion of the plurality of the bare cells 2 may be inserted into the plurality of the partition grooves 43. Through the plurality of the partition grooves 43, one side of the plurality of the partition members 42 may be formed into a curved surface corresponding to the outer periphery of the bare cell 2.

[0060] The cover 4 may include a plurality of connection members 44 .

[0061] The plurality of connecting members 44 connect the plurality of partitioning members 42. The plurality of connecting members 44 may protrude from the cover facing surface 411 toward the first direction (FD arrow direction). Since the plurality of connecting members 44 are combined at both ends of the plurality of partitioning members 42 inserted into each of the accommodating spaces 31, the plurality of connecting members 44 may connect the plurality of partitioning members 42 to each other. The plurality of partitioning members 42 connected to each other by the plurality of connecting members 44 may more firmly support the plurality of bare cells 2. In this case, the two ends of the plurality of partitioning members 42 are based on the first axis direction (X axis direction). Thus, based on the first axis direction (X axis direction), the plurality of partitioning members 42 spaced from each other along the second axis direction (Y axis direction) may be arranged between the plurality of connecting members 44 arranged facing each other. Each of the connecting members 44 may be arranged parallel to the second axis direction (Y axis direction).

[0062] The plurality of connecting members 44 can be inserted into each of the accommodating spaces 31. Among the plurality of partitioning members 42 and the plurality of connecting members 44 inserted into each of the accommodating spaces 31, the plurality of connecting members 44 can function as the two side walls of the plurality of partitioning members 42 with the first axis direction (X axis direction) as a reference. Thus, the plurality of connecting members 44 guide the joining position between the cover 4 and the module housing 3, thereby improving the ease of joining operation between the cover 4 and the module housing 3. In addition, the plurality of connecting members 44 are inserted into the plurality of accommodating spaces 31 and supported by the module housing 3, thereby limiting the movement of the cover 4 relative to the module housing 3. Therefore, the energy storage device 1 of the present invention can further stably support the plurality of bare cells 2 by using the plurality of connecting members 44. The plurality of connecting members 44 and the plurality of partitioning members 42 inserted into each of the accommodating spaces 31 can also be formed integrally. The plurality of connection members 44 , the plurality of partition members 42 , and the cover body 41 may be integrally formed.

[0063] Reference Figures 2 to 7 The energy storage device 1 of the present invention may include a coupling portion 5 .

[0064] The coupling part 5 couples the module housing 3 and the cover 4. The coupling force of the coupling part 5 coupling the module housing 3 and the cover 4 affects the pressure resistance of each of the accommodating spaces 31. The greater the coupling force of the coupling part 5, the greater the pressure resistance. The pressure resistance may refer to the strength of each of the accommodating spaces 31 that can withstand the internal pressure without being damaged or broken.

[0065] The coupling part 5 may couple the module case 3 and the cover 4 by laser welding. The coupling part 5 may be melted by laser irradiated from the upper side of the cover 4, thereby coupling the module case 3 and the cover 4.

[0066] The coupling portion 5 may protrude from the module facing surface 30a of the module body 30 toward the second direction (the SD arrow direction) and be coupled to the module housing 3. The module facing surface 30a may be a surface of the module body 30 that faces the cover facing surface 411. The coupling portion 5 and the module body 30 may also be formed integrally.

[0067] Here, the energy storage device 1 of the present invention is implemented such that the module housing 3 and the cover 4 can be more firmly combined by the combination portion 5, thereby increasing the pressure resistance and explosion-proof performance by increasing the pressure resistance strength. To this end, the cover 4 and the combination portion 5 can be implemented as follows.

[0068] Reference Figures 2 to 11 , the cover 4 may include an outer wall member 45 and an inner wall member 46 .

[0069] The outer wall member 45 protrudes from the cover facing surface 411 toward the first direction (the FD arrow direction). When the cover 4 and the module housing 3 are combined, the outer wall member 45 can be arranged outside the combination portion 5. Thus, the outer wall member 45 can support the combination portion 5 outside the combination portion 5. The outer wall member 45 and the cover body 41 can also be formed integrally.

[0070] The inner wall member 46 protrudes from the cover facing surface 411 toward the first direction (FD arrow direction). The inner wall member 46 may be arranged to be separated from the outer wall member 45. When the cover 4 and the module housing 3 are combined, the inner wall member 46 may be arranged on the inner side of the combination portion 5. Thus, the inner wall member 46 may support the combination portion 5 on the inner side of the combination portion 5. The inner wall member 46 and the cover body 41 may also be formed integrally.

[0071] In the case where the inner wall member 46 and the outer wall member 45 are provided, the coupling portion 5 may include a first coupling member 51. The first coupling member 51 is arranged between the inner wall member 46 and the outer wall member 45 to couple the cover 4 and the module housing 3. The first coupling member 51 may be a part of the coupling portion 5. In the case where the cover 4 and the module housing 3 are coupled, the first coupling member 51 may be supported by the inner wall member 46 and the outer wall member 45, respectively. Thus, the energy storage device 1 of the present invention may utilize the inner wall member 46 and the outer wall member 45 to limit the distance that the first coupling member 51 can flow, so that the state in which the first coupling member 51 couples the cover 4 and the module housing 3 may be firmly maintained. Therefore, the energy storage device 1 of the present invention increases the pressure resistance strength by increasing the coupling force generated by the first coupling member 51, thereby being able to improve the pressure resistance performance and explosion-proof performance. On the other hand, the inner wall member 46 may support the first coupling member 51 on the inner side of the first coupling member 51. The outer wall member 45 may support the first coupling member 51 at the outer side of the first coupling member 51 .

[0072] The inner wall member 46 and the outer wall member 45 can limit the distance that the first bonding resin can flow by supporting the first bonding resin formed by melting the first bonding member 51. As a result, the first bonding resin can be solidified in a state where the flow is restricted by the inner wall member 46 and the outer wall member 45, so that the cover 4 and the module housing 3 can be more firmly combined. Therefore, the energy storage device 1 of the present invention can further improve the pressure resistance and explosion-proof performance by further increasing the bonding force generated by the first bonding member 51. On the other hand, the first bonding member 51 can be laser melted in a state configured between the inner wall member 46 and the outer wall member 45 to become the first bonding resin. Then, as the first bonding resin solidifies between the inner wall member 46 and the outer wall member 45 and becomes the first bonding member 51 again, the cover 4 and the module housing 3 can be firmly combined by the first bonding member 51. The first bonding member 51 can be formed to a size that can fill the space between the inner wall member 46 and the outer wall member 45.

[0073] The inner wall member 46 can be arranged to be spaced inwardly relative to the outer wall member 45. When the cover 4 and the module housing 3 are combined, the inner wall member 46 can be arranged at a position that is shorter than the distance between the outer wall member 45 and the plurality of the storage spaces 31. The outer wall member 45 can be arranged to surround the portion of the cover facing surface 411 that covers the plurality of the storage spaces 31. Thus, when the cover 4 and the module housing 3 are combined, the plurality of the storage spaces 31 can all be arranged on the inner side of the outer wall member 45. The outer wall member 45 as a whole can be formed into a ring shape with a hollow inner side. For example, the outer wall member 45 can be formed into a quadrilateral ring shape with curved edges and corners. The outer wall member 45 can be formed into the same shape as the side surface of the cover body 41.

[0074] In this case, the first coupling member 51 may be a plurality of parts in the coupling portion 5 that are arranged parallel to the first axis direction (X axis direction). The plurality of parts in the coupling portion 5 that correspond to the first coupling member 51 may be arranged spaced apart from each other along the second axis direction (Y axis direction). If the first coupling member 51 is arranged between the inner wall member 46 and the outer wall member 45, the outer side surface of the first coupling member 51 may contact the inner side surface of the outer wall member 45. In this case, the inner side surface of the outer wall member 45 may be the inner side surface of a plurality of parts in the outer wall member 45 that are arranged parallel to the first axis direction (X axis direction). The inner side surface of the first coupling member 51 may contact the outer side surface of the inner wall member 46. In this case, the outer side surface of the inner wall member 46 may be the outer side surface of a plurality of parts in the inner wall member 46 that are arranged parallel to the first axis direction (X axis direction). The first coupling member 51 may protrude from the side wall member 33 toward the second direction (SD arrow direction).

[0075] Reference Figures 2 to 11 In the energy storage device 1 of the present invention, the second coupling member 52 of the coupling portion 5 can be implemented as being supported by a plurality of the connecting members 44 .

[0076] The second coupling member 52 couples the cover 4 and the module housing 3. The second coupling member 52 may be a part of the coupling portion 5. The second coupling member 52 may be a plurality of parts of the coupling portion 5 arranged in parallel with the second axial direction (Y-axis direction). The plurality of parts of the coupling portion 5 corresponding to the second coupling member 52 may be arranged spaced apart from each other along the first axial direction (X-axis direction). The second coupling member 52 and the first coupling member 51 may be connected to each other. In this case, the second coupling member 52 and the first coupling member 51 may be connected to each other to form a hollow ring shape inside as a whole. For example, the second coupling member 52 and the first coupling member 51 may be connected to each other to form a quadrilateral ring shape with curved edges. The second coupling member 52 and the first coupling member 51 may be formed in the same shape as the outer wall member 45 and smaller than the outer wall member 45. Thus, the outer side surface of the second coupling member 52 and the outer side surface of the first coupling member 51 may contact the inner side surface of the outer wall member 45. The second coupling member 52 may protrude from the side wall member 33 toward the second direction (the SD arrow direction).

[0077] In the case where the second coupling member 52 is provided, the cover 4 may include a plurality of first partition members 421 and a plurality of first connecting members 441. The plurality of first partition members 421 may be a part of the plurality of partition members 42. The plurality of first partition members 421 may be arranged at positions corresponding to the first accommodation spaces 311 in the plurality of accommodation spaces 31. The plurality of first connecting members 441 are connecting members that connect the ends of the plurality of first partition members 421 with respect to the first axial direction (X-axis direction) among the plurality of connecting members 44. The second coupling member 52 may be arranged between the first connecting member (hereinafter referred to as the first adjacent connecting member 441) and the outer wall member 45 that are separated from the outer wall member 45 by the shortest distance with respect to the first axial direction (X-axis direction) among the plurality of first connecting members 441, so as to couple the cover 4 with the module housing 3. Thus, the second coupling member 52 may be supported by the first adjacent connecting member 441 and the outer wall member 45, respectively. Therefore, the energy storage device 1 of the present invention can limit the distance that the second combining member 52 can flow, so that the state in which the second combining member 52 is combined with the cover 4 and the module housing 3 can be firmly maintained. Thus, the energy storage device 1 of the present invention increases the pressure resistance by increasing the combining force generated by the second combining member 52, thereby improving the pressure resistance and explosion-proof performance. On the other hand, the outer side surface of the second combining member 52 can be supported by the inner side surface of the portion of the plurality of outer wall members 45 arranged parallel to the second axis direction (Y axis direction). The inner side surface of the second combining member 52 can be supported by the outer side surface of the first adjacent connecting member 441.

[0078] The first adjacent connecting member 441 and the outer wall member 45 can limit the distance that the second bonding resin can flow by supporting the second bonding resin formed by melting the second bonding member 52. As a result, the second bonding resin can be solidified in a state where the flow is restricted by the first adjacent connecting member 441 and the outer wall member 45, so that the cover 4 and the module housing 3 can be more firmly combined. Therefore, the energy storage device 1 of the present invention can further improve the pressure resistance and explosion-proof performance by further increasing the bonding force generated by the second bonding member 52. On the other hand, the second bonding member 52 can be laser melted in a state configured between the first adjacent connecting member 441 and the outer wall member 45 to become the second bonding resin. Then, as the second bonding resin solidifies between the first adjacent connecting member 441 and the outer wall member 45 and becomes the second bonding member 52 again, the cover 4 and the module housing 3 can be firmly combined by the second bonding member 52. The second bonding member 52 can be formed to a size that can fill the space between the first adjacent connecting member 441 and the outer wall member 45.

[0079] On the other hand, the first accommodating space 311 may be arranged at the outermost side of the plurality of accommodating spaces 31 based on the first axis direction (X axis direction). For example, two accommodating spaces 31 arranged at both ends based on the first axis direction (X axis direction) among the plurality of accommodating spaces 31 may be the first accommodating spaces 31. In this case, two parts arranged at both ends based on the first axis direction (X axis direction) among the plurality of coupling parts 5 may be the second coupling members 52. Two groups of partitioning members 42 arranged at both ends based on the first axis direction (X axis direction) among the plurality of partitioning members 42 may be the plurality of first partitioning members 421. The plurality of connecting members 44 connecting both ends of each first partitioning member 421 based on the first axis direction (X axis direction) among the plurality of connecting members 44 may be the plurality of first connecting members 441. Thus, the two parts of the coupling portion 5 corresponding to the second coupling member 52 can be respectively arranged between the first adjacent connecting member 441 and the outer wall member 45 based on the first axial direction (X-axis direction).

[0080] Here, a portion of the second combining member 52 may also be supported by the first adjacent connecting member 441 , and another portion may also be supported by a plurality of first inner wall members 461 among the plurality of inner wall members 46 .

[0081] The plurality of first inner wall members 461 may be spaced apart from each other along the second axis direction (Y axis direction). Based on the second axis direction (Y axis direction), the plurality of first partitioning members 421 may be disposed between the plurality of first inner wall members 461. Each of the plurality of first inner wall members 461 may include a first supporting inner wall 461a and a plurality of first supporting side walls 461b.

[0082] Each of the first supporting inner walls 461a is separated from the outer wall member 45 based on the second axis direction (Y axis direction). Based on the second axis direction (Y axis direction), each of the first supporting inner walls 461a and the outer wall member 45 can support the first coupling member 51. In this case, the first coupling member 51 can be supported by a portion of the outer wall member 45 arranged parallel to the first axis direction (X axis direction) and a plurality of the first supporting inner walls 461a. Each of the first supporting inner walls 461a can be a portion of the first inner wall member 461 arranged parallel to the first axis direction (X axis direction).

[0083] The plurality of first supporting side walls 461b may be formed such that one side is connected to both ends of the first supporting inner wall 461a, and the other side extends toward the plurality of first connecting members 441. One side of the second bonding resin may be supported by the outer wall member 45. In this case, one side of the second bonding resin may be supported by a portion of the outer wall member 45 arranged parallel to the second axial direction (Y-axis direction). A portion of the other side of the second bonding resin may be supported by the first adjacent connecting member 441, and another portion may be supported by the first supporting side wall (hereinafter referred to as the first adjacent supporting side wall 461b) of the plurality of first supporting side walls 461b that is separated from the outer wall member 45 by the shortest distance based on the first axial direction (X-axis direction). Thus, the energy storage device 1 of the present invention can limit the distance that the second bonding resin can flow by using the outer wall member 45, the first adjacent connecting member 441, and the first adjacent supporting side wall 461b, so that the second bonding member 52 formed by curing the second bonding resin can firmly bond the cover 4 and the module housing 3. In this case, the outer side surface of the second coupling member 52 can be supported by the inner side surface of the outer wall member 45. The inner side surface of the second coupling member 52 can be supported by the outer side surface of the first adjacent connecting member 441 and the outer side surface of the first adjacent supporting side wall 461b. The outer side surface of the first adjacent connecting member 441 and the outer side surface of the first adjacent supporting side wall 461b can be arranged on an imaginary reference line parallel to the second axis direction (Y axis direction). Thus, the outer side surface of the first adjacent connecting member 441 and the outer side surface of the first adjacent supporting side wall 461b can be arranged to form a surface.

[0084] Reference Figures 2 to 12 In the energy storage device 1 of the present invention, the third coupling member 53 of the coupling portion 5 can be implemented as being supported by a plurality of the connecting members 44 .

[0085] The third combining member 53 combines the cover 4 and the module housing 3. The third combining member 53 may be a part of the combining portion 5. The third combining member 53 may be a part of the combining portion 5 that is parallel to the second axial direction (Y-axis direction) and is disposed between the second combining members 52. In the case where the third combining member 53 is implemented as a plurality of parts in the combining portion 5, the plurality of parts corresponding to the third combining member 53 may be spaced apart from each other along the first axial direction (X-axis direction). The third combining member 53 may protrude from the partition wall member 34 toward the second direction (SD arrow direction). With the second axial direction (Y-axis direction) as a reference, the two ends of the part corresponding to the third combining member 53 may be connected to the plurality of parts corresponding to the first combining member 51.

[0086] In the case where the third coupling member 53 is provided, the cover 4 may include a plurality of second partition members 422 and a plurality of second connecting members 442. The plurality of second partition members 422 may be a part of the plurality of partition members 42. The plurality of second partition members 422 may be arranged at positions corresponding to the second accommodating spaces 312 in the plurality of accommodating spaces 31. The plurality of second connecting members 442 are connecting members that respectively connect both ends of the plurality of second partition members 422 in the plurality of connecting members 44 based on the first axial direction (X-axis direction). The third coupling member 53 may be arranged between the first connecting member 441 (hereinafter referred to as the first facing connecting member 441) and the second connecting member 442 (hereinafter referred to as the second facing connecting member 442) that are arranged facing each other based on the first axial direction (X-axis direction) to couple the cover 4 with the module housing 3. Thus, the third connecting member 53 can be supported by the first connecting member 441 and the second connecting member 442, respectively. Therefore, the energy storage device 1 of the present invention can limit the distance that the third connecting member 53 can flow, so that the state of the third connecting member 53 combining the cover 4 and the module housing 3 can be firmly maintained. Thus, the energy storage device 1 of the present invention increases the pressure resistance by increasing the bonding force generated by the third connecting member 53, thereby improving the pressure resistance and explosion-proof performance. On the other hand, the first connecting member 441 and the second connecting member 442 can be the connecting members that are separated from each other by the shortest distance based on the first axial direction (X-axis direction) among the plurality of the first connecting members 441 and the plurality of the second connecting members 442. Based on the first axial direction (X-axis direction), one side of the third connecting member 53 can be supported by the first connecting member 441, and the other side of the third connecting member 53 can be supported by the second connecting member 442.

[0087] The first facing connecting member 441 and the second facing connecting member 442 can limit the distance that the third bonding resin can flow by supporting the third bonding resin formed by melting the third bonding member 53. As a result, the third bonding resin can be solidified in a state where the flow is restricted by the first facing connecting member 441 and the second facing connecting member 442, so that the cover 4 and the module housing 3 can be more firmly combined. Therefore, the energy storage device 1 of the present invention can further improve the pressure resistance and explosion-proof performance by further increasing the bonding force generated by the third bonding member 53. On the other hand, the third bonding member 53 can be laser melted in a state where it is arranged between the first facing connecting member 441 and the second facing connecting member 442 to become the third bonding resin. Then, as the third bonding resin solidifies between the first facing connecting member 441 and the second facing connecting member 442 and becomes the third bonding member 53 again, the cover 4 and the module housing 3 can be firmly combined through the third bonding member 53. The third coupling member 53 may be formed to have a size capable of filling a space between the first opposing connecting member 441 and the second opposing connecting member 442 .

[0088] On the other hand, the second accommodation space 312 may be arranged inside the plurality of accommodation spaces 31 based on the first axial direction (X-axis direction). For example, based on the first axial direction (X-axis direction), the accommodation space arranged between the plurality of first accommodation spaces 311 in the plurality of accommodation spaces 31 may be the second accommodation space 312. In this case, based on the first axial direction (X-axis direction), the portion of the coupling portion 5 arranged between the plurality of portions corresponding to the second coupling member 52 may be the third coupling member 53. Based on the first axial direction (X-axis direction), the partitioning member arranged between the plurality of first partitioning members 421 in the plurality of partitioning members 42 may be the plurality of second partitioning members 422. Based on the first axial direction (X-axis direction), the plurality of connecting members 44 connecting both ends of each second partitioning member 422 in the plurality of connecting members 44 may be the plurality of second connecting members 442. The second accommodation space 312 may also be provided in plurality. In this case, the third coupling member 53 disposed between the plurality of second accommodation spaces 312 with reference to the first axis direction (X axis direction) may be supported by the plurality of second opposing connection members 442 disposed facing each other.

[0089] Here, a portion of the third coupling member 53 may also be supported by the first opposing connecting member 441 and the second opposing connecting member 442 , and another portion may be supported by the second inner wall member 462 of the plurality of inner wall members 46 .

[0090] The plurality of second inner wall members 462 may be spaced apart from each other along the second axis direction (Y axis direction). Based on the second axis direction (Y axis direction), the plurality of second partitioning members 422 may be disposed between the second inner wall members 462. Each of the plurality of second inner wall members 462 may include a second supporting inner wall 462a and a plurality of second supporting side walls 462b.

[0091] Each of the second supporting inner walls 462a is separated from the outer wall member 45 based on the second axial direction (Y-axis direction). Based on the second axial direction (Y-axis direction), each of the second supporting inner walls 462a and the outer wall member 45 can support the first coupling member 51. In this case, the first coupling member 51 can be supported by a portion of the outer wall member 45 arranged parallel to the first axial direction (X-axis direction) and a plurality of the second supporting inner walls 462a. Each of the second supporting inner walls 462a can be a portion of the second inner wall member 462 arranged parallel to the first axial direction (X-axis direction).

[0092] Each of the second supporting side walls 462b may be formed so that one side is connected to both ends of the second supporting inner wall 462a and the other side extends toward the plurality of second connecting members 442. The third bonding resin may be supported by the first supporting side wall 461b (hereinafter referred to as the first opposing supporting side wall 461b) and the second supporting side wall 462b (hereinafter referred to as the second opposing supporting side wall 462b) arranged to face each other. The first opposing supporting side wall 461b and the second opposing supporting side wall 462b may be opposing supporting side walls that are spaced apart from each other by the shortest distance based on the first axis direction (X axis direction) among the plurality of first supporting side walls 461b and the plurality of second supporting side walls 462b. In this case, a portion of one side of the third bonding resin may be supported by the first opposing connecting member 441, and another portion may be supported by the first opposing supporting side wall 461b. A portion of the other side of the third bonding resin may be supported by the second facing connecting member 442, and another portion may be supported by the second facing supporting side wall 462b. Thus, the energy storage device 1 of the present invention may utilize the first facing connecting member 441, the first facing supporting side wall 461b, the second facing connecting member 442, and the second facing supporting side wall 462b to limit the distance that the third bonding resin can flow, so that the third bonding member 53 formed by curing the third bonding resin can firmly bond the cover 4 and the module housing 3.

[0093] In this case, one side of the third combining member 53 can be supported by the outer side of the first facing connecting member 441 and the outer side of the first facing supporting side wall 461b. The outer side of the first facing connecting member 441 and the outer side of the first facing supporting side wall 461b can be arranged on an imaginary reference line parallel to the second axial direction (Y-axis direction). Thus, the outer side of the first facing connecting member 441 and the outer side of the first facing supporting side wall 461b can be arranged to form a surface. The other side of the third combining member 53 can be supported by the outer side of the second facing connecting member 442 and the outer side of the second facing supporting side wall 462b. The outer side of the second facing connecting member 442 and the outer side of the second facing supporting side wall 462b can be arranged on an imaginary reference line parallel to the second axial direction (Y-axis direction). Thus, the outer side of the second facing connecting member 442 and the outer side of the second facing supporting side wall 462b can be arranged to form a surface.

[0094] On the other hand, in the case where a plurality of second accommodating spaces 312 are provided, with the first axis direction (X-axis direction) as a reference, the third connecting member 53 arranged between the plurality of second accommodating spaces 312 can be supported by a plurality of second opposing connecting members 442 arranged opposite to each other and second opposing supporting side walls 462b arranged opposite to each other.

[0095] On the other hand, the energy storage device 1 of the present invention can be implemented as follows: the outer wall member 45 forms a ring shape along the outermost edge of the cover body 41, so that when the cover 4 and the module housing 3 are combined, the outer wall member 45 forms a closed shape. In addition, the energy storage device 1 of the present invention can be implemented as follows: the inner wall member 46 and the connecting member 44 form a ring shape along the edge of each of the accommodating spaces 31, so that when the cover 4 and the module housing 3 are combined, the inner wall member 46 and the connecting member 44 form a closed shape for each of the accommodating spaces 31. Through such a structure of the outer wall member 45, the inner wall member 46 and the connecting member 44, the energy storage device 1 of the present invention can achieve complete separation of a plurality of separate accommodating spaces 31, thereby preventing the electrolyte from moving between the plurality of accommodating spaces 31. Moreover, the energy storage device 1 of the present invention also has the effect of doubly preventing the electrolyte from flowing out from the inside to the outside.

[0096] Here, with the first axis direction (X axis direction) as a reference, the outer wall member 45 and the plurality of inner wall members 46 may be formed into shapes symmetrical to each other with the first symmetry line of the cover body 41 as a reference. The first symmetry line of the cover body 41 may be arranged in parallel with the second axis direction (Y axis direction) at a position equidistant from both ends of the cover body 41 with the first axis direction (X axis direction) as a reference. With the second axis direction (Y axis direction) as a reference, the outer wall member 45 and the plurality of inner wall members 46 may be formed into shapes symmetrical to each other with the second symmetry line of the cover body 41 as a reference. The second symmetry line of the cover body 41 may be arranged in parallel with the first axis direction (X axis direction) at a position equidistant from both ends of the cover body 41 with the second axis direction (Y axis direction) as a reference.

[0097] In addition, with the first axis direction (X axis direction) as a reference, the joint portion 5 may be formed into a shape symmetrical to each other with the first symmetry line of the module body 30 as a reference. The first symmetry line of the module body 30 may be arranged in parallel with the second axis direction (Y axis direction) at a position spaced the same distance from both ends of the module body 30 with the first axis direction (X axis direction) as a reference. With the second axis direction (Y axis direction) as a reference, the joint portion 5 may be formed into a shape symmetrical to each other with the second symmetry line of the module body 30 as a reference. The second symmetry line of the module body 30 may be arranged in parallel with the first axis direction (X axis direction) at a position spaced the same distance from both ends of the module body 30 with the second axis direction (Y axis direction) as a reference.

[0098] As described above, based on the first axis direction (X axis direction) and the second axis direction (Y axis direction), the outer wall member 45, the plurality of inner wall members 46, and the joint portion 5 are formed into mutually symmetrical shapes based on a plurality of symmetry lines, so that the energy storage device 1 of the present invention can combine the cover 4 and the module housing 3 with an overall uniform bonding force by using the joint portion 5. Therefore, the energy storage device 1 of the present invention can improve the pressure resistance and explosion-proof performance by achieving an overall uniform bonding force.

[0099] Reference Figures 2 to 13 In the energy storage device 1 of the present invention, the cover 4 can support the plurality of bare cells 2 received in the module housing 3 . To this end, the cover 4 can include a plurality of separation protrusions 47 .

[0100] A plurality of the separation protrusions 47 may be formed on each of the separation members 42. With the first axial direction (X-axis direction) as a reference, the plurality of separation protrusions 47 may protrude from both sides of the separation grooves 43 formed on each of the separation members 42 toward the first direction (FD arrow direction). Thus, each of the separation protrusions 47 can reduce the shaking, vibration, etc. generated by the bare cell 2 by limiting the movable distance of the bare cell 2 inserted into the separation groove 43 toward the first axial direction (X-axis direction). Therefore, the energy storage device 1 of the present invention can improve the stability of the plurality of bare cells 2 by using the plurality of separation protrusions 47.

[0101] Each of the plurality of separated protrusions 47 may include a raised surface 471. The plurality of raised surfaces 471 are surfaces of the plurality of separated protrusions 47 arranged toward the first direction (the direction of the FD arrow). The plurality of raised surfaces 471 may be respectively formed as a curved surface whose center of curvature is arranged on the side of the second direction (the direction of the SD arrow). That is, the raised surface 471 may constitute a curved surface convex toward the first direction (the direction of the FD arrow). Thus, the energy storage device 1 of the present invention may have the following effects.

[0102] First, in the comparative example where each of the separation protrusions 47 protrudes in the first direction (FD arrow direction) and forms a pointed end, there is a high risk of damage or breakage by the pointed portions of the plurality of separation protrusions 47 as the bare cell 2 expands during use.

[0103] Next, in an embodiment in which the raised surfaces 471 of each of the separating protrusions 47 are formed as curved surfaces convex toward the first direction (FD arrow direction), even if the bare cell 2 expands during use and contacts with a plurality of the raised surfaces 471, the risk of the bare cell 2 being damaged or broken by the plurality of the raised surfaces 471 can be reduced.

[0104] As described above, the energy storage device 1 of the present invention uses a plurality of convex surfaces 471 constituting a curved surface, so even if the bare cell 2 expands during use, the risk of damage or breakage of the bare cell 2 can be reduced. Therefore, the energy storage device 1 of the present invention can not only extend the maintenance cycle of the bare cell 2, but also save the maintenance cost of the bare cell 2.

[0105] In the case where a plurality of the separation protrusions 47 are provided, each of the connection members 44 may protrude from the cover facing surface 411 toward the first direction (the direction of the FD arrow) by a length shorter than that of each of the separation protrusions 47. Thus, in the energy storage device 1 of the present invention, even if the bare cell 2 expands during use, the possibility of the bare cell 2 contacting the plurality of the connection members 44 can be reduced. Therefore, the energy storage device 1 of the present invention can further reduce the risk of the bare cell 2 being damaged or broken during use.

[0106] In the case where a plurality of the separation protrusions 47 are provided, the connection surface 440 of each of the connection members 44 can be formed as a curved surface with the center of curvature arranged on the second direction (the SD arrow direction). That is, the plurality of the connection surfaces 440 can constitute a curved surface convex toward the first direction (the FD arrow direction). Thus, in the energy storage device 1 of the present invention, even if the bare cell 2 expands during use and contacts the plurality of the connection surfaces 440, the risk of the bare cell 2 being damaged or broken by the plurality of the connection surfaces 440 can be reduced.

[0107] Reference Figures 2 to 13 , the cover 4 may include a plurality of reinforcing members 48 .

[0108] The plurality of reinforcing members 48 connect the plurality of separating members 42. The plurality of reinforcing members 48 can connect the plurality of separating members 42 that are spaced apart from each other along the second axis direction (Y axis direction). For example, the plurality of the first separating members 421 and the plurality of the second separating members 422 can be connected by a plurality of reinforcing members 48 that are different from each other. The plurality of reinforcing members 48 can connect the separating members 42 that are spaced apart from each other along the second axis direction (Y axis direction) together with the plurality of connecting members 44. Thus, the energy storage device 1 of the present invention can use the plurality of separating members 42 to more firmly support the plurality of bare cells 2. Each of the reinforcing members 48 can be arranged in parallel with the second axis direction (Y axis direction). The plurality of reinforcing members 48 can be spaced apart from each other along the first axis direction (X axis direction).

[0109] Taking the first axis direction (X axis direction) as a reference, a plurality of reinforcing members 48 may be arranged between a plurality of connecting members 44 connecting both ends of a plurality of the separating members 42. For example, taking the first axis direction (X axis direction) as a reference, a plurality of reinforcing members 48 different from each other may be arranged between a plurality of the first connecting members 441 and between a plurality of the second connecting members 442. Thus, the energy storage device 1 of the present invention utilizes a plurality of the reinforcing members 48 and a plurality of the connecting members 44 to further increase the strength of the plurality of the separating members 42, thereby improving the supporting stability of the plurality of the bare cells 2. Fig. 9 , two reinforcing members 48 are respectively arranged between the connecting members 44 connecting both ends of the partition member 42 based on the first axis direction (X axis direction), but the invention is not limited thereto, and three or more reinforcing members 48 may be arranged.

[0110] Each of the reinforcing members 48 may protrude from the cover facing surface 411 toward the first direction (the direction of the FD arrow). Each of the reinforcing members 48 may protrude from the cover facing surface 411 toward the first direction (the direction of the FD arrow) by a length shorter than that of each of the connecting members 44. Thus, the energy storage device 1 of the present invention may reduce the degree of interference between the plurality of bare cells 2 inserted into the plurality of the partition grooves 43 and the plurality of reinforcing members 48. The plurality of reinforcing members 48 may not protrude toward the plurality of the partition grooves 43. In this case, each of the reinforcing members 48 may protrude from the cover facing surface 411 toward the first direction (the direction of the FD arrow) by a length shorter than that of each of the partition members 42.

[0111] Reference Figures 2 to 13 , the cover 4 may include a plurality of protruding members 49 .

[0112] The plurality of protruding members 49 protrude from the cover outer surface 412 toward the second direction (the SD arrow direction). Since the plurality of protruding members 49 protrude from the cover outer surface 412, the thickness of the portion of the cover body 41 where the plurality of protruding members 49 are formed can be increased. Thus, the energy storage device 1 of the present invention utilizes the plurality of protruding members 49 to increase the strength of the cover body 41, thereby further improving the pressure resistance and explosion-proof performance. Here, the thickness can be a length based on the first direction (the FD arrow direction).

[0113] The plurality of protruding members 49 can be arranged at positions corresponding to the respective storage spaces 31. Thus, the plurality of protruding members 49 can be arranged at portions that directly affect the pressure resistance of the plurality of storage spaces 31. In addition, since the protruding members 49 protrude from the cover outer surface 412 toward the second direction (the SD arrow direction) at positions corresponding to the respective storage spaces 31, the pressure resistance of the plurality of storage spaces 31 can be increased without affecting the volume of the plurality of storage spaces 31. The horizontal cross section of each of the protruding members 49 can be formed to have a shape that is substantially consistent with the horizontal cross section of each of the storage spaces 31, and the size is also substantially consistent. Here, the horizontal cross section is based on the horizontal plane where the first axis direction (X axis direction) and the second axis direction (Y axis direction) are located.

[0114] Here, the module case 3 may be implemented such that the bare cell 2 is disposed at a position spaced apart from the bottom member 32. To this end, the module case 3 may include a plurality of support members 35.

[0115] The plurality of support members 35 protrude from the bottom member 32. The plurality of support members 35 may protrude from the bottom member 32 toward the second direction (the SD arrow direction) in each of the accommodation spaces 31. Thus, the plurality of support members 35 may support the plurality of bare cells 2 in the plurality of accommodation spaces 31 so that the plurality of bare cells 2 are arranged at a position separated from the bottom member 32. Therefore, the energy storage device 1 of the present invention may utilize the plurality of support members 35 to ensure additional space between the plurality of bare cells 2 and the bottom member 32. Thus, the energy storage device 1 of the present invention is implemented such that, when gravity acts on the side of the bottom member 32, even if the electrolyte leaks from the plurality of bare cells 2, the space between the plurality of bare cells 2 and the bottom member 32 may be utilized to accommodate the leaked electrolyte. Therefore, the energy storage device 1 of the present invention may reduce the risk of short circuits and the like caused by electrolytes leaking from the plurality of bare cells 2, thereby further improving product reliability and safety.

[0116] Each of the plurality of supporting members 35 may include a supporting groove 351 and a supporting surface 352 .

[0117] The bare cell 2 may be inserted into the support groove 351. The support groove 351 may be implemented by a groove formed at a predetermined depth in the support member 35. A portion of the bare cell 2 received in the accommodation space 31 may be inserted into the support groove 351.

[0118] The support surface 352 may contact the bare cell 2 inserted into the support groove 351. The support surface 352 is a surface configured to face the support groove 351. The support surface 352 may form a curved surface corresponding to the outer periphery of the bare cell 2. Thus, the support surface 352 supports the bare cell 2 inserted into the support groove 351, thereby limiting the movable distance of the bare cell 2. Therefore, the support surface 352 may reduce vibration, shaking, etc. generated by the bare cell 2.

[0119] The plurality of support members 35 may be inserted in each of the accommodation spaces 31. In this case, the plurality of support members 35 may be spaced apart from each other along the second axis direction (Y axis direction) in each of the accommodation spaces 31. Thus, the plurality of support members 35 inserted into each of the accommodation spaces 31 may support different portions of the bare cell 2, and thus the bare cell 2 may be further stably supported.

[0120] Each of the support members 35 may be formed to have the same length as the accommodation space 31 based on the first axis direction (X axis direction). Thus, based on the first axis direction (X axis direction), both ends of the plurality of support members 35 may be combined with the side wall member 33 and the partition wall member 34, or may be combined with the plurality of partition wall members 34. Therefore, the energy storage device 1 of the present invention is implemented such that the supporting force of the plurality of support members 35 may be further strengthened by using the side wall member 33 and the partition wall member 34, so that the plurality of support members 35 may be used to further stably support the plurality of bare cells 2.

[0121] The module housing 3 may include a plurality of reinforcement protrusions 36 .

[0122] The plurality of reinforcing protrusions 36 connect the plurality of supporting members 35. The plurality of reinforcing protrusions 36 can connect the plurality of supporting members 35 that are spaced apart from each other along the second axis direction (Y-axis direction). That is, the plurality of supporting members 35 arranged in each of the accommodating spaces 31 can be connected by the plurality of reinforcing protrusions 36. Thus, the energy storage device 1 of the present invention can utilize the plurality of supporting members 35 to more firmly support the plurality of bare cells 2. Each of the reinforcing protrusions 36 can be arranged parallel to the second axis direction (Y-axis direction). The plurality of reinforcing protrusions 36 can be spaced apart from each other along the first axis direction (X-axis direction). Taking the first axis direction (X-axis direction) as a reference, the plurality of reinforcing protrusions 36 can be arranged between the two ends of the plurality of supporting members 35. In Figure 8 It is shown in the figure that two reinforcing protrusions 36 are respectively arranged in each of the accommodating spaces 31 , but the present invention is not limited thereto. Three or more reinforcing protrusions 36 may also be respectively arranged in each of the accommodating spaces 31 .

[0123] Each of the reinforcing protrusions 36 may protrude from the bottom member 32 toward the second direction (the SD arrow direction). Each of the reinforcing protrusions 36 may protrude from the bottom member 32 toward the second direction (the SD arrow direction) by a length shorter than that of each of the supporting members 35. Thus, the plurality of reinforcing protrusions 36 may not protrude toward the plurality of supporting grooves 351. Therefore, the energy storage device 1 of the present invention can prevent the plurality of bare cells 2 inserted into the plurality of supporting grooves 351 and the plurality of reinforcing protrusions 36 from interfering with each other.

[0124] Reference Figures 2 to 13 , the energy storage device 1 of the present invention may include an external terminal 6 .

[0125] The external terminal 6 is electrically connected to at least one of the plurality of bare cells 2. The external terminal 6 may be formed of a conductive material. One side of the external terminal 6 may be electrically connected to at least one of the plurality of bare cells 2 inside the module housing 3. The other side of the external terminal 6 may be arranged outside the module housing 3. The other side of the external terminal 6 may be electrically connected to another energy storage device 1 outside the module housing 3. The other side of the external terminal 6 may also be electrically connected to an external device (not shown) outside the module housing 3. The external device uses the external terminal 6 to perform a prescribed operation on the plurality of bare cells 2. For example, the external device may be a management device for managing power. The external device may also be a detection device for performing a monitoring operation such as monitoring the voltage of the plurality of bare cells 2, or a balancing operation such as adjusting the voltage of the plurality of bare cells 2. The external terminal 6 may be combined with the module housing 3 by insert molding.

[0126] The other side of the external terminal 6 can be formed into a plate shape that stands parallel to the first direction (FD arrow direction). Thus, when the energy storage device 1 of the present invention is provided with a plurality of and stacked configurations, the ease of electrically connecting the plurality of energy storage devices 1 of the present invention in series can be improved by using the other side of the plurality of external terminals 6 that stand parallel to the first direction (FD arrow direction).

[0127] Reference Figures 2 to 16 The energy storage device 1 of the present invention may include a first external terminal 61 and a second external terminal 62 .

[0128] The first external terminal 61 may be electrically connected to a first bare cell 2a among the plurality of bare cells 2. The first bare cell 2a may be any one of the plurality of bare cells 2 disposed at both ends with respect to the first axis direction (X axis direction). Fig.14 As a reference, the first bare cell 2a may be a bare cell disposed at the leftmost side among the plurality of bare cells 2. On the other hand, the first external terminal 61 may be combined with the module housing 3 by insert molding.

[0129] The first external terminal 61 may include a first external terminal body 611 and a first lead-out member 612 .

[0130] The first external terminal body 611 may be electrically connected to the first bare cell 2a. The first external terminal body 611 may be disposed inside the module housing 3. The first external terminal body 611 may be one side of the external terminal 6.

[0131] The first lead-out member 612 can be arranged outside the module housing 3. The first lead-out member 612 can be electrically connected to the external device or another energy storage device 1 outside the module housing 3. The first lead-out member 612 can be formed into a plate shape erected parallel to the first direction (FD arrow direction). Thus, when the energy storage device 1 of the present invention is provided with a plurality of and stacked configurations, the ease of the operation of electrically connecting the plurality of energy storage devices 1 of the present invention in series can be improved. The first lead-out member 612 can be combined with the first external terminal body 611. The first lead-out member 612 and the first external terminal body 611 can also be formed integrally.

[0132] by Fig.14 As a reference, when the first external terminal 61 is electrically connected to the first bare cell 2 a disposed at the leftmost side among the plurality of bare cells 2 , the first lead-out member 612 may be disposed on the right side of the first external terminal body 611 .

[0133] The first external terminal 61 may include a first protruding member 613 .

[0134] The first protruding member 613 may protrude from the upper portion of the first external terminal body 611 toward the side wall member 33. An insertion groove (not shown) for inserting the first protruding member 613 may also be formed in the side wall member 33. In this case, the first protruding member 613 may be inserted into the insertion groove.

[0135] The second external terminal 62 may be electrically connected to a second bare cell 2b among the plurality of bare cells 2. The second bare cell 2b may be any one of the plurality of bare cells 2 disposed at both ends with respect to the first axis direction (X axis direction). Fig.14 As a reference, when the first bare cell 2a is arranged at the leftmost side among the plurality of bare cells 2, the second bare cell 2b may be the bare cell arranged at the rightmost side. On the other hand, the second external terminal 62 may be combined with the module housing 3 by insert molding.

[0136] The second external terminal 62 may include a second external terminal body 621 and a second lead-out member 622 .

[0137] The second external terminal body 621 may be electrically connected to the second bare cell 2b. The second external terminal body 621 may be disposed inside the module housing 3. The second external terminal body 621 may be one side of the external terminal 6.

[0138] The second lead-out member 622 can be arranged outside the module housing 3. The second lead-out member 622 can be electrically connected to the external device or another energy storage device 1 outside the module housing 3. The second lead-out member 622 can be formed into a plate shape erected parallel to the first direction (FD arrow direction). Thus, when the energy storage device 1 of the present invention is provided with a plurality of and stacked configurations, the ease of the operation of electrically connecting the plurality of energy storage devices 1 of the present invention in series can be improved. The second lead-out member 622 can be combined with the second external terminal body 621. The second lead-out member 622 and the second external terminal body 621 can also be formed integrally.

[0139] The second lead-out member 622 and the first lead-out member 612 may protrude from the module housing 3 in the same direction. When the plurality of bare cells 2 housed in the module housing 3 are connected in series, the energy storage device 1 of the present invention may be implemented such that 2N bare cells 2 are housed in the module housing 3. Therefore, in the energy storage device 1 of the present invention, since the second lead-out member 622 and the first lead-out member 612 may protrude from the module housing 3 in the same direction, the ease of electrically connecting the plurality of energy storage devices 1 of the present invention in series may be improved.

[0140] When the second lead-out member 622 and the first lead-out member 612 protrude from the module housing 3 in the same direction, the second lead-out member 622 may be arranged on the side closer to the first external terminal 61 of the two sides of the second external terminal body 621 with the first axial direction (X-axis direction) as the reference. The first lead-out member 612 may be arranged on the side closer to the second external terminal 62 of the two sides of the first external terminal body 611 with the first axial direction (X-axis direction) as the reference. Fig.14 As a reference, when the second external terminal 62 is electrically connected to the second bare cell 2b disposed on the rightmost side of the plurality of bare cells 2, the second lead-out member 622 may be disposed on the left side of the second external terminal body 621. Fig.14 As a reference, when the first external terminal 61 is electrically connected to the first bare cell 2a disposed on the leftmost side among the plurality of bare cells 2, the first lead-out member 612 can be disposed on the right side of the first external terminal body 611. Thus, the energy storage device 1 of the present invention can reduce the distance between the second lead-out member 622 and the first lead-out member 612 outside the module housing 3, thereby further improving the ease of electrically connecting the plurality of energy storage devices 1 of the present invention in series.

[0141] The second external terminal 62 may include a second protruding member 623 .

[0142] The second protruding member 623 may protrude from the upper portion of the second external terminal body 621 toward the side of the side wall member 33. The second protruding member 623 may be inserted into the insertion groove (not shown) formed in the side wall member 33.

[0143] The second external terminal 62 and the first external terminal 61 may be formed in mutually symmetrical shapes. For example, the second external terminal 62 and the first external terminal 61 may be formed in mutually symmetrical shapes with respect to a symmetry line parallel to the second axis direction (Y axis direction).

[0144] Reference Figures 2 to 16 The energy storage device 1 of the present invention may include a plurality of bus bars 7 .

[0145] The plurality of bus bars 7 are electrically connected to at least two bare cells 2 of the plurality of bare cells 2. When the plurality of bare cells 2 are connected in series, the plurality of bus bars 7 can be electrically connected to the two bare cells 2. In this case, the plurality of bus bars 7 are respectively inserted into one partition wall member 34 and arranged in two accommodation spaces 31, so that the two bare cells 2 can be electrically connected. When the plurality of bare cells 2 are connected in parallel, all the plurality of bare cells 2 accommodated in the module housing 3 can be electrically connected. In this case, the plurality of bare cells 2 are inserted into all the partition wall members 34 of the module housing 3 and arranged in all the accommodation spaces 31, so that all the plurality of bare cells 2 can be electrically connected. The plurality of bus bars 7 can be combined with the module housing 3 to be supported by the side wall member 33. The plurality of bus bars 7 can be combined with the module housing 3 by insert molding. The plurality of bus bars 7 can be formed of a conductive material.

[0146] On the other hand, the bus bar 7 will not be arranged on one side of the plurality of bare cells 2 electrically connected to the external terminal 6. For example, when one side of the first bare cell 2a is electrically connected to the first external terminal 61, the bus bar 7 may be arranged only on the other side of the first bare cell 2a, but not on one side of the first bare cell 2a. For example, when one side of the second bare cell 2b is electrically connected to the second external terminal 62, the bus bar 7 may be arranged only on the other side of the second bare cell 2b, but not on one side of the second bare cell 2b. Both sides of the remaining bare cells 2 that are not electrically connected to the external terminals 61 and 62 may be electrically connected to the bus bar 7 respectively.

[0147] Each of the plurality of bus bars 7 may include a bus bar body 71 .

[0148] The bus bar body 71 may be disposed between the bare cell 2 accommodated in the accommodation space 31 and the side wall member 33. The bus bar body 71 may be electrically connected to the bare cell 2 accommodated in the accommodation space 31. The bus bar body 71 may be disposed upright along the up-down direction.

[0149] Each of the plurality of bus bars 7 may include an upper protruding member 72 .

[0150] The upper protruding member 72 protrudes from the bus bar body 71. The upper protruding member 72 may contact the top surface of the side wall member 33 and be supported by the side wall member 33. The upper protruding member 72 may also be inserted into the insertion groove formed in the side wall member 33. The upper protruding member 72 may protrude from the upper portion of the bus bar body 71 toward the side of the side wall member 33. The upper protruding member 72 and the bus bar body 71 may also be formed integrally.

[0151] Reference Figures 2 to 16 The energy storage device 1 of the present invention may include a plurality of internal terminals 8 .

[0152] The plurality of internal terminals 8 are used to connect to each of the bare cells 2. The plurality of internal terminals 8 may be connected to the plurality of bus bars 7 or the plurality of external terminals 6. In the case of a bare cell 2 whose two sides are electrically connected to mutually different bus bars 7 among the plurality of bare cells 2, the internal terminal 8 connected to one side of the bare cell 2 and the internal terminal 8 connected to the other side of the bare cell 2 may be connected to mutually different bus bars 7. In the case of a bare cell 2 whose one side is electrically connected to the external terminal 6 and the other side is electrically connected to the bus bar 7 among the plurality of bare cells 2, the internal terminal 8 connected to one side of the bare cell 2 may be connected to the external terminal 6, and the internal terminal 8 connected to the other side of the bare cell 2 may be connected to the bus bar 7. The plurality of internal terminals 8 may be formed of a conductive material.

[0153] Each of the plurality of internal terminals 8 may include an internal terminal body 81 .

[0154] The internal terminal body 81 may be disposed between the bare cell 2 and the bus bar 7. In this case, the internal terminal body 81 is respectively connected to the bare cell 2 and the bus bar 7, so that the bare cell 2 and the bus bar 7 can be electrically connected. The internal terminal body 81 may also be disposed between the bare cell 2 and the external terminal 6. The internal terminal body 81 is respectively connected to the bare cell 2 and the external terminal 6, so that the bare cell 2 and the external terminal 6 can be electrically connected. The inner side surface of the internal terminal body 81 may be connected to the first electrode lead 212 or the second electrode lead 222 of the bare cell 2. The outer side surface of the internal terminal body 81 may be connected to the bus bar body 71 of the bus bar 7 or the external terminal body of the external terminal 6.

[0155] Each of the plurality of internal terminals 8 may include a terminal protruding member 82 .

[0156] The terminal protruding member 82 protrudes from the inner terminal body 81. The terminal protruding member 82 may protrude from the upper portion of the inner terminal body 81 toward the side of the side wall member 33. The terminal protruding member 82 and the inner terminal body 81 may also be formed integrally.

[0157] When the internal terminal 8 is connected to the bus bar 7, the terminal protruding member 82 contacts the upper protruding member 72 of the bus bar 7, thereby being supported by the bus bar 7. Thus, the internal terminal 8 is firmly supported by the bus bar 7, thereby being stably connected to the bare cell 2 and the bus bar 7, respectively.

[0158] When the internal terminal 8 is connected to the first external terminal 61, the terminal protruding member 82 contacts the first protruding member 613 of the first external terminal 61, so that the terminal 8 can be supported by the first protruding member 613. Thus, the internal terminal 8 is firmly supported by the first external terminal 61, so that the internal terminal 8 can stably maintain the state of being connected to the first bare cell 2a and the first external terminal 61, respectively.

[0159] When the internal terminal 8 is connected to the second external terminal 62, the terminal protruding member 82 contacts the second protruding member 623 of the second external terminal 62, so that the terminal 8 can be supported by the second protruding member 623. Thus, the internal terminal 8 is firmly supported by the second external terminal 62, so that the internal terminal 8 can stably maintain the state of being connected to the second bare cell 2b and the second external terminal 62, respectively.

[0160] Each of the plurality of internal terminals 8 may include a plurality of impregnation holes 83 .

[0161] The plurality of impregnation holes 83 may be formed by penetrating the internal terminal body 81. The plurality of impregnation holes 83 may be used as channels for impregnating the plurality of bare cells 2 with electrolyte. Thus, the energy storage device 1 of the present invention is implemented such that, in a state where the plurality of internal terminals 8 are combined with the plurality of bare cells 2, an impregnation operation of impregnating the plurality of bare cells 2 with electrolyte can be implemented through the plurality of impregnation holes 83. Therefore, the energy storage device 1 of the present invention can improve the ease of the impregnation operation.

[0162] Each of the plurality of impregnation holes 83 may be formed through the internal terminal body 81. In this case, the plurality of impregnation holes 83 may be arranged spaced apart from each other in the circumferential direction with the center of the internal terminal body 81 as a reference. Any of the plurality of impregnation holes 83 may also be formed through the center of the internal terminal body 81.

[0163] The present invention described above is not limited to the above-described embodiments and drawings, and it is obvious to those skilled in the art that various substitutions, modifications and changes can be made without departing from the technical concept of the present invention.

Claims

1. An energy storage device, characterized in that: include: The module housing is formed with a plurality of accommodation spaces; A plurality of bare cells are respectively accommodated in the plurality of accommodation spaces; a cover, combined with the module housing; as well as a combining portion for combining the module housing and the cover; The module housing is in direct contact with the plurality of bare cells received in the plurality of accommodation spaces to support the plurality of bare cells; The cover comprises: A cover body, combined with the module housing to cover a plurality of the accommodation spaces; An outer wall member protrudes from a cover-facing surface of the cover body toward the module housing toward a first direction side of the module housing; and an inner wall member protruding from the cover facing surface toward the first direction and spaced apart from the outer wall member; The coupling portion includes a first coupling member disposed between the outer wall member and the inner wall member to couple the module housing and the cover.

2. The energy storage device according to claim 1, characterized in that: The outer wall member and the inner wall member support the first bonding resin formed by melting the first bonding member so as to limit a distance over which the first bonding resin can flow.

3. The energy storage device according to claim 1 or 2, characterized in that: The module housing includes a module body formed with a plurality of the accommodation spaces; The coupling portion protrudes from a module-facing surface of the module body that faces the cover-facing surface toward a second direction side of the cover body and is coupled to the module housing.

4. The energy storage device according to claim 1, characterized in that: The outer wall member is configured to surround a portion of the lid facing surface that covers a plurality of the accommodation spaces; The inner wall member is arranged to be spaced inwardly relative to the outer wall member.

5. The energy storage device according to claim 1, characterized in that: In the module housing, a plurality of the accommodating spaces are arranged spaced apart from each other along a first axis direction; The cover comprises: a plurality of first partition members protruding toward the first direction side from positions of the cover corresponding to first accommodation spaces among the plurality of accommodation spaces; and A plurality of first connecting members, connecting respective ends of the plurality of first partitioning members based on the first axial direction; The coupling portion includes a second coupling member, the second coupling member being disposed between a first coupling member of the plurality of first coupling members that is spaced from the outer wall member by the shortest distance based on the first axial direction and the outer wall member, so as to couple the module housing and the cover; The first connecting member and the outer wall member, which are the shortest distances apart from the outer wall member based on the first axial direction among the plurality of first connecting members, support the second bonding resin formed by melting the second bonding member to limit the distance by which the second bonding resin can flow.

6. The energy storage device according to claim 5, characterized in that: The inner wall member includes a plurality of first inner wall members arranged to be spaced apart from each other along a second axis direction perpendicular to the first axis direction; The plurality of first partition members are arranged between the plurality of first inner wall members based on the second axial direction; The plurality of first inner wall components each include: a first supporting inner wall, spaced apart from the outer wall member based on the second axial direction to support the first coupling member; as well as A plurality of first supporting side walls, wherein one side of the plurality of first supporting side walls is connected to both ends of the first supporting inner wall and the other side of the plurality of first supporting side walls is extended toward the plurality of first connecting members; The second bonding resin is supported on one side by the outer wall member and on the other side by the first connection member and the first supporting side wall which are spaced apart from the outer wall member by the shortest distance based on the first axial direction.

7. The energy storage device according to claim 6, characterized in that: The cover comprises: a plurality of second partition members protruding from positions of the cover corresponding to second storage spaces among the plurality of storage spaces toward the first direction; and A plurality of second connecting members, connecting respective ends of the plurality of second partitioning members based on the first axial direction; The coupling portion includes a third coupling member, the third coupling member being disposed between a first coupling member and a second coupling member disposed facing each other with respect to the first axial direction as a reference, so as to couple the module housing and the cover; The first connecting member and the second connecting member, which are arranged to face each other with reference to the first axial direction, support the third bonding resin formed by melting the third bonding member so as to limit the distance by which the third bonding resin can flow.

8. The energy storage device according to claim 7, characterized in that: The inner wall member includes a plurality of second inner wall members arranged to be spaced apart from each other along the second axis direction; The plurality of second inner wall components each include: a second supporting inner wall, spaced apart from the outer wall member based on the second axial direction to support the first coupling member; and A plurality of second supporting side walls, wherein one side of the plurality of second supporting side walls is connected to both ends of the second supporting inner wall and the other side thereof is extended toward the plurality of second connecting members; The first supporting side wall and the second supporting side wall, which are arranged to face each other with reference to the first axial direction, support the third binding resin to limit a distance over which the third binding resin can flow.

9. The energy storage device according to claim 1, characterized in that: In the module housing, a plurality of the accommodating spaces are arranged spaced apart from each other along a first axis direction; The cover comprises: A plurality of partition members protruding from the opposite surfaces of the cover toward the first direction; a plurality of partition grooves formed in the plurality of partition members; and A plurality of separation protrusions, with the first axis direction as a reference, protruding from both sides of each of the separation grooves toward the first direction; Each of the plurality of spaced protrusions comprises a protrusion surface disposed toward the first direction; Each of the plurality of convex surfaces is formed as a curved surface having a center of curvature disposed on a second direction side opposite to the first direction.

10. The energy storage device according to claim 9, characterized in that: The cover includes a plurality of connecting members protruding from opposite surfaces of the cover toward the first direction side; Each of the plurality of connection members protrudes from the opposing surfaces of the cover toward the first direction by a length shorter than that of each of the spaced protrusions.

11. The energy storage device according to claim 9, characterized in that: The cover includes a plurality of connecting members protruding from opposite surfaces of the cover toward the first direction side; Each of the plurality of connecting members comprises a connecting surface arranged toward the first direction; Each of the plurality of connection surfaces is formed as a curved surface with a center of curvature disposed on the second direction side.

12. The energy storage device according to claim 1, characterized in that: In the module housing, a plurality of the accommodating spaces are arranged spaced apart from each other along a first axis direction; The cover comprises: A plurality of partition members protruding from the opposite surfaces of the cover toward the first direction; a plurality of connecting members for connecting a plurality of partitioning members which are arranged to be spaced apart from each other along a second axis direction perpendicular to the first axis direction; and A plurality of reinforcing members, connecting a plurality of spaced members spaced apart from each other along the second axis direction; The plurality of reinforcing members are disposed between a plurality of connecting members that connect both ends of the partition member with respect to the first axial direction.

13. The energy storage device according to claim 1, characterized in that: The cover includes a plurality of protruding members, and the plurality of protruding members protrude from the cover outer surface of the cover body arranged on the opposite side of the cover facing surface toward a second direction side opposite to the first direction; The plurality of protruding members are arranged at positions corresponding to the respective accommodation spaces.

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