Cell Assembly

Abstract

The present invention provides a battery cell assembly that includes a case that defines an accommodation space therein, a battery cell accommodated in the accommodation space, a cover that defines an installation space therein and is disposed on the case, and an element member that is located in the installation space and disposed on a board spaced apart from a wall of the cover that defines the installation space, thereby safely protecting the element members inside. The present invention also provides a battery cell assembly that includes a support member that is higher than the height of the element members to protect the element members from external impact, and a board with a hole in the center is used so that a metal plate is exposed to the underside through the hole and connected to the battery cell.

Description

[Technical Field]

[0001] The present invention relates to a cell assembly, and more particularly to a cell assembly capable of safely protecting element members inside. [Background technology]

[0002] Generally, depending on the type of external device, the cell assembly has a detachable structure that allows it to be freely attached to and detached from the external device, or a built-in structure that is embedded in the external device. For example, a detachable cell assembly is mainly used for external devices such as a laptop computer, while a built-in cell assembly is mainly used for external devices such as a smartphone or smart pad.

[0003] In this case, the battery installed in the cell assembly may be at risk of overheating or explosion due to overcharging or overcurrent, etc. Therefore, in order to control abnormal states of the battery, elements such as a protection circuit module (PCM) may be installed in the cell assembly.

[0004] However, since the durability of the element is low, if the cell assembly is dropped or subjected to an external impact, the element may be easily broken or damaged, which may cause the element to be unable to properly control the battery, resulting in a problem of the battery not operating properly.

[0005] An example of such a conventional technique is disclosed in Patent Document 1 below. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Korean Patent Registration No. 10-1650030 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention provides a cell assembly that can reduce the impact on the internal element members.

[0008] The present invention provides a cell assembly that can protect the internal element components and improve durability. [Means for solving the problem]

[0009] The present invention comprises a case including a first side frame and a lower frame, the case forming an accommodation space above the lower frame, a battery cell accommodated in the accommodation space, a cover including a second side frame and an upper frame, the second side frame being coupled to the first side frame and disposed on the case to form an arrangement space between the lower part of the upper frame and the upper part of the battery cell, and an element member disposed in the arrangement space and formed spaced apart from the upper frame in the vertical direction.

[0010] The element member is disposed closer to the battery cell than the upper frame, forming a predetermined separation distance between the upper frame and an element disposed on the element member.

[0011] The element member includes a board disposed on the battery cell, and an element disposed on the board and spaced apart from the upper frame in the vertical direction to form a space capable of absorbing impact.

[0012] The predetermined distance formed between the upper frame and the element is not less than 0.3 mm and not more than 0.7 mm.

[0013] The cell assembly further includes a support member that is longer than the element in the vertical direction and is disposed between the board and the upper frame.

[0014] At least a portion of the support member is expandable and contractible in the vertical direction so as to absorb shock.

[0015] The support member provides a path for heat to be transferred from the element member to the cover.

[0016] The board comprises a printed circuit board and the elements comprise a capacitor and a thermistor.

[0017] In the cell assembly of the present invention, the board is a printed circuit board having a hole in the center thereof, and a metal plate disposed on the printed circuit board is configured so that an upper end of the metal plate is hooked onto an upper surface of the printed circuit board and a lower end of the metal plate is exposed to a lower surface of the printed circuit board through the hole, and the unit cell is located below the printed circuit board and has a weld portion welded to at least a portion of the metal plate exposed through the hole.

[0018] Furthermore, the metal plate is in direct contact with the inside of the hole of the printed circuit board, and the upper end of the metal plate is spaced a predetermined distance from the periphery of the upper surface of the printed circuit board. [Effects of the Invention]

[0019] According to one aspect of the present invention, it is possible to reduce the impact that an external force exerts on the element members inside the cell assembly. As a result, it is possible to safely protect the element members inside the cell assembly and improve their durability. As a result, the life of the cell assembly is extended and maintenance is made easier. [Brief explanation of the drawings]

[0020] [Figure 1] 1A and 1B are diagrams showing the structure of a cell assembly according to one embodiment of the present invention. [Figure 2] 10A and 10B are diagrams illustrating a structure in which an element is separated from a cover according to an embodiment of the present invention; [Figure 3]10A and 10B are diagrams showing a structure in which a support member according to an embodiment of the present invention is disposed between a cover and a board. [Figure 4] 10A and 10B are diagrams showing a structure in which a support member according to another embodiment of the present invention is disposed between a cover and a board. [Figure 5] 10A and 10B are diagrams showing a structure in which a support member is formed together with a cover according to the present invention; [Figure 6] FIG. 1 is a conceptual diagram showing a conventional cylindrical cell assembly. [Figure 7] FIG. 1 is a conceptual diagram illustrating an exemplary cylindrical cell assembly according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, the embodiments of the present invention will be described in more detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, and may be embodied in various different forms. These embodiments are provided merely to complete the disclosure of the present invention and to fully convey the scope of the invention to those skilled in the art. In order to explain the present invention in detail, the drawings may be exaggerated, and the same reference numerals in the drawings refer to the same components.

[0022] Fig. 1 is a diagram showing the structure of a cell assembly according to one embodiment of the present invention, and Fig. 2 is a diagram showing a structure in which an element is separated from a cover according to one embodiment of the present invention. The cell assembly according to one embodiment of the present invention will be described below.

[0023] The cell assembly according to one embodiment of the present invention is a device for providing power to an electronic device. Referring to FIG. 1, the cell assembly 100 includes a case 110, a battery cell 120, a cover 130, and an element member 140.

[0024] The case 110 includes a first side frame 111 and a lower frame 112. The first side frame 111 forms the periphery of the outer side of the case 110, and the lower frame 112 is connected to the lower part of the first side frame 111 to form the lower part of the outer shape of the case 110. As a result, a storage space can be formed above the lower frame 112. That is, the space surrounded by the lower frame 112 and the first side frame can serve as the storage space. For example, the case may be made in a pouch shape to form the storage space therein, and the upper surface may be opened to form the first opening. However, the shape and structure of the case 110 are not limited thereto and can be variously modified.

[0025] The battery cells 120 are accommodated in the accommodation space inside the case 110. For example, the battery cells 120 may be formed in a rectangular plate shape following the shape of the accommodation space, and the volume of the battery cells 120 may be equal to or smaller than the volume of the accommodation space. Therefore, the battery cells 120 can be fitted into the accommodation space through the first opening.

[0026] The battery cell 120 has a structure in which a positive electrode and a negative electrode are stacked with a separator sandwiched therebetween, and a lead portion including a negative electrode lead and a positive electrode lead is formed. However, the shape and structure of the battery cell 120 are not limited thereto and can be variously modified.

[0027] The cover 130 includes a second side frame 131 and an upper frame 132. The second side frame 131 forms the periphery of the outer side of the cover 130, and the upper frame 132 is connected to the upper part of the second side frame 131 to form the upper part of the outer side of the cover 130. Therefore, an installation space can be formed between the lower part of the upper frame 132 and the upper part of the battery cell 120. That is, the space surrounded by the lower part of the upper frame 132, the upper part of the battery cell 120, and the second side frame 131 can become the installation space. Therefore, the lower surface of the cover 130 can be opened to form a second opening.

[0028] The cover 130 may also be removably disposed on the case 110. That is, the lower part of the second side frame 131 and the upper part of the first side frame 111 are coupled together, thereby sealing the interior of the cover 130 and the case 110. A first opening is formed in the upper surface of the case 110, and a second opening is formed in the lower surface of the cover 130, allowing the storage space and the installation space S to communicate with each other through the openings. However, the shape and structure of the cover 130 are not limited thereto and can be modified in various ways.

[0029] The element member 140 is disposed in the installation space S inside the cover 130. For example, the element member 140 may be a protection circuit module (PCM), and the lead portion of the battery cell 120 may be electrically connected to the element member 140. Therefore, the element member 140 can detect an abnormal state of the battery cell 120, such as overcharging or overcurrent, and if an abnormal state of the battery cell 120 is detected, the element member 140 can control the battery cell 120 to suppress or prevent the battery cell 120 from overheating or exploding.

[0030] Furthermore, the element member 140 is spaced apart from the upper frame 132 of the cover 130 in the vertical direction in the installation space S. Therefore, the element member 140 is disposed closer to the battery cell 120 than the upper frame 132, and a predetermined distance can be formed between the element 142 disposed in the element member 140 and the upper frame 132. Therefore, when an external force is applied to the cover 130, it is possible to prevent a direct impact from being applied to the element 142, thereby suppressing or preventing damage to the element 142. The element member 140 includes a board 141 and an element 142.

[0031] The board 141 may be disposed on the battery cell 120. The board 141 may be a printed circuit board (PCB). This allows the lead portions and elements 142 of the battery cell 120 to be mounted on the board 141. An external input / output terminal (not shown) may be bonded to the board 141 for electrically connecting with an external electronic device that applies power to the battery cell 120 or receives power from the battery cell 120. However, the structure of the board 141 is not limited to this and can be modified in various ways.

[0032] The element 142 may be mounted on the board 141. The element 142 may be configured as a safety element made up of an active element or a protection element formed with a direct circuit, and can prevent overheating and explosion of the battery cell 120 caused by overcharging, over-discharging, or overcurrent. For example, the element 142 may include a capacitor 142a and a thermistor 142b.

[0033] Alternatively, the element 142 may be disposed to face the upper frame 132 and be spaced apart from the upper frame 132 in the vertical direction. This makes it possible to form a space that can absorb an impact applied to the element 142, corresponding to the distance between the element 142 and the upper frame 132. Therefore, the external force applied to the cover 130 can be prevented from being directly transmitted to the element 142, thereby protecting the element 142.

[0034] For example, when the cell assembly 100 is dropped and the cover 130 collides with the bottom surface, the cover 130 is crushed by an amount corresponding to the distance between the element 142 and the wall of the cover 130, thereby absorbing the impact. Therefore, the impact generated when the cell assembly 100 is dropped can be minimized from being applied to the element 142. Therefore, the element 142 can be stably protected and damage to the element 142 can be suppressed or prevented.

[0035] In this case, as shown in FIG. 2, if the separation distance A in one direction (or vertical direction) between the wall of the cover 130 and the board 141 is 1.2 mm to 0.8 mm, the separation distance B in the vertical direction between the upper frame 132 and the element 142 may be 0.3 mm to 0.7 mm. If the separation distance B in the vertical direction between the upper frame 132 and the element 142 is less than 0.3 mm, there is insufficient space to absorb impacts applied to the element 142, which may result in the element 142 not being safely protected from external forces. If the separation distance B in the vertical direction between the upper frame 132 and the element 142 exceeds 0.7 mm, the size of the cover 130 may become excessively large, which may reduce the space utilization efficiency of the cell assembly 100. Therefore, the separation distance B in the vertical direction between the upper frame 132 and the element 142 may be set to stably protect the element 142 while preventing a reduction in the space utilization efficiency of the cell assembly 100.

[0036] Meanwhile, the distance between the thermistor 142b and the upper frame 132 may be varied depending on the element 142. For example, if the thermistor 142b is more durable than the capacitor 142a, the vertical length of the thermistor 142b may be longer than the vertical length of the capacitor 142a. That is, the vertical distance between the upper frame 132 and thermistor 142b may be shorter than the vertical distance between the upper frame 132 and capacitor 142a. Therefore, when the cover 130 is crushed by an impact, the upper frame 132 collides with the thermistor 142b, which has high durability. The thermistor 142b prevents the upper frame 132 from being crushed to the position of the capacitor 142a, so that the capacitor 142a does not collide with the upper frame 132. This allows for more secure protection of elements with lower durability. However, the method for determining the length of the element 142 in one direction is not limited to this and can be modified in various ways.

[0037] In this way, the upper frame 132 and the element members 140 are spaced apart, thereby reducing the impact that an external force may have on the element members 140 inside the cell assembly 100. Therefore, the element members 140 inside the cell assembly 100 can be safely protected and their durability can be improved. This extends the life of the cell assembly 100 and makes maintenance easier.

[0038] Fig. 3 is a diagram showing a structure in which a support member according to one embodiment of the present invention is disposed between a cover and a board, and Fig. 4 is a diagram showing a structure in which a support member according to another embodiment of the present invention is disposed between a cover and a board. The support member according to the embodiment of the present invention will be described below.

[0039] 3 and 4, the cell assembly 100 may further include a support member 150. The support member 150 is disposed in the arrangement space S together with the element member 140. The support member 150 may extend in the vertical direction. The support member 150 may be formed to be longer in the vertical direction than the element 142, and may be disposed between the board 141 and the wall of the cover 130.

[0040] For example, as shown in Fig. 3, the support member 150 may be formed in a circular rod shape. Because the support member 150 is longer in the vertical direction than the element 142, the element 142 and the upper frame 132 can be spaced apart in the vertical direction by an amount corresponding to the difference in the vertical lengths of the support member 150 and the element 142. Therefore, the support member 150 can stably separate the upper frame 132 and the element 142. Therefore, even if an impact is applied to the cover 130, the cover 130 can stably maintain its outer shape due to the support member 150, so that transmission of the impact to the element 142 can be more effectively suppressed or prevented.

[0041] In this case, the support member 150 may be formed to be hollow. Therefore, the support member 150 can space the upper frame 132 and the element 142, while reducing its weight. This minimizes an increase in the weight of the cell assembly 100. However, the shape and structure of the support member 150 are not limited to this and can be modified in various ways.

[0042] Furthermore, a plurality of support members 150 may be provided. The element 142 may be located in the center of the board 141, and the support members 150 may be located on the outer periphery of the board 141 and arranged along the periphery of the board 141. As a result, the support members 150 support different parts of the upper frame 132, allowing the cover 130 to more stably maintain its outer shape. However, the structure in which the support members 150 are arranged is not limited thereto and can be variously modified.

[0043] In this case, the support member 150 may be made of a thermally conductive material. Therefore, the support member 150 can form a path for heat transfer from the device member 140 to the cover 130. As a result, heat generated from the device 142 or the battery cell 120 is transferred to the board 141, and the heat transferred to the board 141 is transferred to the cover 130 via the support member 150 and can be released to the outside. The support member 150 can effectively suppress or prevent the device 142 or the battery cell 120 from overheating.

[0044] In addition, when a plurality of support members 150 are provided, heat from different regions of the element member 140 can be dissipated to the outside through the different support members 150. Therefore, heat from the element member 140 can be dissipated uniformly as a whole, and local overheating of the element 142 or the battery cell 120 can be suppressed or prevented.

[0045] 4, the support member 150' may be formed so that at least a portion thereof is expandable and contractible in the vertical direction. For example, the support member 150' may be formed in the shape of a spring that is expandable and contractible in the vertical direction. Therefore, when an impact is applied to the cover 130, the support member 150' can absorb the impact by contracting in the vertical direction in the installation space S, thereby further suppressing or preventing the impact from being transmitted to the element 142.

[0046] In this case, the vertical length of the support member 150' when it is maximally contracted may be longer than the vertical length of the element 142. Therefore, even when the support member 150' is contracted, the wall of the cover 130 can be prevented from coming into contact with the element 142, thereby preventing the element 142 from colliding with the wall of the cover 130 and being damaged.

[0047] Furthermore, multiple spring-like support members 150' may be provided. Therefore, since the support members 150' absorb impact in different regions, even if an impact is applied from a certain position on the cover 130, the support members 150' can easily absorb the impact. Therefore, the support members 150' can more effectively suppress or prevent the impact from being transmitted to the element 142. However, the support members 150' may not be spring-like and may be made of an expandable material, allowing various combinations of the embodiments.

[0048] In this way, the support member 150 can stably separate the upper frame 132 and the element member 140. Therefore, when the cover 130 receives an impact, the support member 150 can more effectively suppress or prevent the wall of the cover 130 from colliding with the element member 140. This safely protects the element member 140 inside the cell assembly 100, extending the life of the cell assembly 100 and making maintenance easier.

[0049] 5, the support member 150 of the present invention may be provided integrally with the cover 130. When the end of the support member 150 provided integrally with the cover 130 is supported by the upper surface of the board 141, the height of the support member 150 from the upper frame 132 is set to be greater than the height of the element 142 protruding above the board 141, thereby protecting the element from impact from above.

[0050] 5, the support member 150 may have a lattice structure spaced a predetermined distance from the inner periphery of the second side frame 131. In this case, the support member 150 may function to reinforce the rigidity of the side of the cover 130.

[0051] 2 to 4, the end of the vertical extension from the upper frame 132 may not contact the top surface of the board 141 but may extend into the space between the side of the board 141 and the second side frame 131. In this case, the height of the support member 150 may be substantially the same as that of the second side frame 131 and may be formed integrally with the cover 130. The end of the vertical extension may be coupled to and supported by the top of the first side frame 111 together with the bottom of the second side frame 131 when the cover 130 is assembled to the cell assembly, or may be supported by the top surface of the battery cell 120. In such a case, the height of the support member 150 and the length of the second side frame 131 are greater than the sum of the height of the element 142 and the thickness of the board 141.

[0052] Meanwhile, the present invention provides a cell assembly with enhanced rigidity by further improving the structure in which the metal plate 1200 is electrically connected to the printed circuit board (board), thereby solving the drawback of being vulnerable to external impacts, and since a separate bending process is not performed, assembly errors due to the bending process are prevented, and since insulating tape is not used, it brings about cost savings and cost reduction effects.

[0053] FIG. 6 is a conceptual diagram showing a conventional cylindrical cell assembly.

[0054] Referring to FIG. 6, a conventional cylindrical cell assembly includes a unit cell 10, a metal plate 20, a printed circuit board 30, an insulating tape 40, a cap cover 50, and a foam tape 60.

[0055] Specifically, in the conventional method for manufacturing a cylindrical cell assembly, a metal plate 20 and the positive electrode 10 of a unit cell 10 are welded together, and then the metal plate 20 is bent twice to surround the top, side, and bottom surfaces of a printed circuit board 30, and insulating tape 40 is placed between the metal plate 20 and the bottom surface of the printed circuit board 30. Next, a cap cover 50 is attached to the top of the printed circuit board 30, and a foam tape 60 is adhered to the top of the cap cover 50.

[0056] Meanwhile, conventional cylindrical cell assemblies have drawbacks such as low rigidity due to bending assembly tolerances, assembly strength, etc., making them vulnerable to external impacts, and the additional cost of the insulating tape 40 increases costs.

[0057] Improved from this, FIG. 7 is a conceptual diagram illustrating an exemplary cylindrical cell assembly according to the present invention.

[0058] Referring to FIG. 7, the cell assembly according to the present invention comprises a printed circuit board 1100, a metal plate 1200, and a unit cell 1300.

[0059] The printed circuit board 1100 has a hole 1110 in the center. The printed circuit board 1100 is a portion for mounting circuit elements using surface mount technology (SMT). The central hole 1110 is a portion where a metal plate 1200 is disposed (or assembled).

[0060] The metal plate 1200 is disposed on the printed circuit board 1100 such that its upper end 1210 is hooked onto the upper surface of the printed circuit board 1100 and its lower end is exposed to the lower surface of the printed circuit board 1100 through the hole 1110. The metal plate 1200 and the printed circuit board 1100 form an integrated protection circuit module (PCM).

[0061] The unit cell 1300 is disposed under the printed circuit board 1100 and has a weld 1310 welded to at least a portion of the metal plate 1200 exposed through the hole 1110 .

[0062] The cell assembly according to the present invention has the above-described structure, which strengthens the fixing force between the protection circuit module (PCM) and the cell, prevents assembly tolerances caused by the bending process of the conventional cell assembly, and does not require a separate insulating tape, thereby reducing costs and ensuring a smaller overall pack length that meets customer needs.

[0063] In one example, the unit cell 1300 has a positive electrode located at a welding portion 1310. That is, the welding portion 1310 is a portion where the positive electrode of the cell 1300 and the metal plate 1200 are welded.

[0064] The metal plate 1200 is in direct contact with the inside of the hole 1110 of the printed circuit board 1100. In the present invention, "direct contact" means that there is no other member between the metal plate 1200 and the inside of the hole 1110.

[0065] In one specific example, an upper end 1210 of the metal plate 1200 may be spaced a predetermined distance from the peripheral edge of the upper surface of the printed circuit board 1100. The metal plate 1200 can be spaced apart from the peripheral edge of the printed circuit board 1100 because the bending process of the conventional cylindrical cell assembly is not performed. In contrast, referring to FIG. 6 , the conventional cylindrical cell assembly is formed so that the metal plate 20 wraps around the peripheral edge of the printed circuit board 30 due to the bending process.

[0066] In another example, the metal plate 1200 has a welding surface that is welded to the printed circuit board 1100. For example, the welding surface may be a surface that directly contacts the inside of the hole 1110.

[0067] The unit cell according to the present invention may be a cylindrical unit cell. As components of the cylindrical unit cell, various known materials can be used, and there is no particular limitation.

[0068] The cell assembly according to the present invention may also include a cell cover (not shown) that surrounds the exterior of the cell, and a cap cover 1400 that is combined with the cell cover while covering the top of the substrate.

[0069] The cell assembly may also include a foam tape 1500 attached to the upper portion of the cap cover 1500. The foam tape 1500 allows for flexibility in overall length through compression and serves to protect the cell assembly from external impacts.

[0070] The meanings of the symbols used in the description of the present invention and in the drawings are as follows. [Explanation of symbols]

[0071] 100 Cell Assembly 110 cases 120, 1300 battery cells 130 Cover S Installation space 140 Element materials 141, 1100 board (printed circuit board) 142 elements 150 Support member 1200 Metal Plate

Claims

1. a case including a first side frame and a lower frame, the case forming an accommodation space above the lower frame; a battery cell accommodated in the accommodation space; a cover including a second side frame and an upper frame, the second side frame being coupled to the first side frame, the cover being disposed on the case and forming an arrangement space between a lower portion of the upper frame and an upper portion of the battery cell; an element member disposed in the installation space and spaced apart from the upper frame in the vertical direction; Equipped with the element member is disposed closer to the battery cell than the upper frame, forming a predetermined separation distance between the upper frame and an element disposed on the element member; The element member is a board disposed on the battery cell; an element disposed on the board and spaced apart from the upper frame in the vertical direction so as to form a space capable of absorbing an impact; Equipped with a support member having a vertical length longer than that of the element and disposed between the board and the upper frame; At least a portion of the support member is expandable in the vertical direction so as to absorb shock.

2. 2. The cell assembly according to claim 1, wherein the predetermined separation distance formed between the upper frame and the element is not less than 0.3 mm and not more than 0.7 mm.

3. The cell assembly of claim 1 , wherein the support member is integrally formed with the cover.

4. The support member may be integrally formed with the cover but may include a lattice structure extending from an inner periphery of the second side frame; The vertical length of the support member is greater than the sum of the vertical length of the element and the thickness of the board, The cell assembly of claim 1 , wherein the support member is disposed in a space between a side of the board and a second side frame.

5. 2. The cell assembly of claim 1, wherein the support member forms a path for heat transfer from the element member to the cover.

6. the board comprises a printed circuit board; the printed circuit board has a hole in its center; a metal plate disposed on the printed circuit board such that an upper end of the metal plate is caught on an upper surface of the printed circuit board and a lower end of the metal plate is exposed to a lower surface of the printed circuit board through the hole; a unit cell located under the printed circuit board and having a weld portion welded to at least a portion of the metal plate exposed through the hole; The cell assembly of claim 1 , comprising:

7. a printed circuit board having a hole in its center; a metal plate disposed on the printed circuit board such that an upper end of the metal plate is caught on an upper surface of the printed circuit board and a lower end of the metal plate is exposed to a lower surface of the printed circuit board through the hole; a unit cell located under the printed circuit board, the unit cell having a weld portion welded to at least a portion of the metal plate exposed through the hole; Equipped with a lower surface of the printed circuit board and a lower surface of the metal plate are configured to contact an upper surface of the unit cell in a state in which the lower surface of the printed circuit board and the lower surface of the metal plate are flush with each other, A cell assembly, wherein the entire upper surface of the unit cell is configured to be in tight contact with both the lower surface of the printed circuit board and the lower surface of the metal plate without an insulating sheet therebetween.

8. The cell assembly according to claim 7 , wherein the unit cell has a positive electrode located at the welded portion.

9. The cell assembly of claim 8 , wherein the metal plate is in direct contact with the inside of the hole in the printed circuit board.

10. 8. The cell assembly of claim 7, wherein the upper end of the metal plate is spaced a predetermined distance from the periphery of the upper surface of the printed circuit board.

11. The cell assembly of claim 7 , wherein the metal plate has a welding surface that is welded to the printed circuit board.

12. The cell assembly of claim 7 , wherein the unit cell is a cylindrical unit cell.

13. a cell cover that surrounds the exterior of the unit cell; a cap cover combined with the cell cover in a state where the cap cover covers an upper portion of the printed circuit board; The cell assembly of claim 7 , comprising:

14. The cell assembly of claim 13 , comprising a foam tape adhered to a top of the cap cover.

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