Cell module assembly and battery pack including the same

Abstract

A cell module assembly according to the present invention may include a plurality of cylindrical battery cells each having a battery can and a top cap coupled to an upper end of the battery can, a cell frame having a receiving portion capable of receiving the plurality of cylindrical battery cells upright therein and an open portion on one side, and a cell spacer that wraps around all or part of the lower end of the battery can and is coupled to the open portion of the cell frame.

Description

[Technical Field]

[0001] This application claims priority based on Korean Patent Application No. 10-2021-0082680, filed on June 24, 2021, and the entire contents disclosed in the specification and drawings of that application are incorporated herein by reference.

[0002] The present invention relates to a battery pack, and more particularly to a cell module assembly and a battery pack including the same, which reduce the number of cell frames, prevent loose movement of battery cells, minimize the possibility of short circuits, and improve durability, from the viewpoints of cost reduction and process simplification. [Background technology]

[0003] Secondary batteries, which have high applicability across a range of products and electrical properties such as high energy density, are widely used not only in portable devices but also in electric vehicles (EVs), hybrid electric vehicles (HEVs), electric scooters, etc. These secondary batteries not only have the temporary advantage of dramatically reducing the use of fossil fuels, but also have the advantage of producing no by-products associated with energy use, and are therefore attracting attention as a new energy source that is environmentally friendly and improves energy efficiency.

[0004] Currently widely used types of secondary batteries include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries. The operating voltage of such unit secondary battery cells, i.e., unit battery cells, is approximately 2.5 V to 4.5 V. Therefore, currently, a single secondary battery cell cannot provide sufficient output to drive, for example, an electric scooter. To use a secondary battery as an energy source for an electric scooter, for example, a battery module must be configured in which multiple lithium-ion battery cells are connected in series and / or parallel. Typically, the battery modules are connected in series to form a battery pack that includes a battery management system (BMS) that maintains the functionality of the battery modules, a battery disconnection unit (BDU), electrical connection components, etc.

[0005] Meanwhile, FIG. 1 is a diagram showing two cell module assemblies CMA-A and CMA-B included in a battery pack according to the prior art. The prior art cell module assembly CMA-A includes two cell frames a1 and a2 to accommodate and secure cylindrical battery cells. That is, the prior art cell module assembly CMA-A is formed by assembling two cell frames a1 and a2 to accommodate and secure battery cells, as shown in FIG. 2. Therefore, to construct a battery pack including two cell module assemblies CMA-A and CMA-B, four cell frames a1, a2, b1, and b2 are required. Such prior art battery packs have drawbacks, such as a high number of assembly processes and an increased number of parts, which leads to higher production costs. Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been devised to solve the above problems, and aims to provide a cell module assembly and a battery pack including the same, in which the conventional two-part cell frame is fabricated into a single cell frame from the standpoints of cost and process simplification, and in which battery cells can be housed in this single cell frame without any looseness.

[0007] Another object of the present invention is to provide a cell module assembly having excellent electrical safety and heat dissipation properties, and a battery pack including the same.

[0008] However, the technical problems that the present invention aims to solve are not limited to the above-mentioned problems, and other problems not mentioned will be clearly understood by those skilled in the art from the description of the invention given below. [Means for solving the problem]

[0009] To achieve the above-mentioned object, a cell module assembly according to one aspect of the present invention may include a plurality of cylindrical battery cells each having a battery can and a top cap coupled to an upper end of the battery can; a cell frame having an accommodation portion capable of upright accommodating the plurality of cylindrical battery cells therein and an open portion on one side; and a cell spacer that wraps around all or part of the lower end of the battery can and is coupled to the open portion of the cell frame.

[0010] All of the plurality of cylindrical battery cells are housed in the cell frame so that the lower ends of the battery cans face the open portion of the cell frame and the upper ends of the battery cans face the top plate portion of the cell frame located in the opposite direction from the open portion of the cell frame, and the cell spacer is formed from an insulating material and may have a spacer hole that wraps around the lower ends of the battery cans.

[0011] The spacer hole may be provided to have a diameter corresponding to the diameter of the battery can.

[0012] The plurality of cylindrical battery cells may be disposed inside the cell frame and supported and arranged upright by a cell holder that surrounds at least a portion of the periphery of the upper end of the battery can.

[0013] The cell frame may be configured such that the distance between the open portion of the cell frame and the top plate portion of the cell frame corresponds to the length of the cylindrical battery cell.

[0014] The open portion of the cell frame includes an outer edge portion that forms a periphery, and the outer edge portion includes a first outer edge portion that is horizontal with a bottom surface of the battery can, and a second outer edge portion that forms a step that is lower than the first outer edge portion by an amount corresponding to the thickness of the cell spacer, and the cell spacer may be arranged so that at least a portion of its edge is placed on the second outer edge portion.

[0015] The cell module assembly may further include a screen plate that covers the cell spacer and a bottom surface of the battery can and is coupled to the cell frame.

[0016] The bottom surface of the battery can and the screen plate may be adhesively fixed to each other.

[0017] The top plate portion of the cell frame may have terminal connection holes that partially expose the upper end of the battery can, and the cylindrical battery cells may have the top caps or upper edges of the battery cans exposed through the terminal connection holes and be wire-bonded to a plurality of bus bar plates arranged on the outer surface of the top plate portion of the cell frame.

[0018] A sensing unit is disposed on a side portion of the cell frame that intersects with the outer surface of the top plate portion of the cell frame, and the sensing unit may include: a printed circuit board that is detachably coupled to the cell frame; a plurality of sensing plates that are coupled to the printed circuit board and wire-bonded to the bus bar plate; and a temperature sensing member that is coupled to the printed circuit board and measures the temperature of one or more of the cylindrical battery cells that are spaced a predetermined distance apart.

[0019] The plurality of sensing plates are provided in a number that corresponds one-to-one with the bus bar plates, and can be connected to the corresponding bus bar plates by wire bonding.

[0020] Each of the plurality of sensing plates may be provided in a structure that is bent at least once, with one side fixedly connected to the printed circuit board and the other side arranged to be aligned with one side of the outer surface of the cell frame on which the bus bar plate is arranged.

[0021] Each of the plurality of sensing plates may include a board connection portion attached to the printed circuit board, and a frame mounting portion extending from the board connection portion and positioned around the periphery of one surface of the outside of the cell frame.

[0022] The one end of the bus bar plate and the frame mounting portion of the sensing plate may be arranged alternately adjacent to each other.

[0023] The temperature sensing member may include a first temperature sensing member having one end fitted inside the cell frame, the first temperature sensing member comprising a first cable extending a predetermined length from the printed circuit board, and a first thermistor coupled to an end of the first cable, the first thermistor being fitted into the accommodating portion through a temperature sensing hole drilled in a top plate portion of the cell frame and configured to come into contact with the cylindrical battery cell.

[0024] The cylindrical battery cell that the first thermistor contacts may be one of the battery cells in a central region inside the cell frame.

[0025] The top plate portion of the cell frame may include a plurality of cable guide ribs protruding above the linear wiring path of the first cable so that the wiring is routed in a straight line from the printed circuit board to the temperature sensing hole.

[0026] The plurality of cable guide ribs may include a pull-in portion support rib that supports the first cable at a point just before it is pulled into the temperature sensing hole so that the point is spaced a predetermined height from the surface of the top plate portion of the cell frame.

[0027] The temperature sensing member includes a second temperature sensing member having one end extending to a side cutout hole formed in the other outer surface of the cell frame that intersects with the top plate portion of the cell frame, and the second temperature sensing member includes a second cable extending a predetermined length from the printed circuit board and a second thermistor coupled to an end of the second cable, and the second thermistor can be positioned so as to contact the side of the battery cell located at the outermost periphery of the accommodating portion through the side cutout hole.

[0028] According to another aspect of the present invention, there can be provided a battery pack including the above-described cell module assembly, in which the cylindrical battery cells are housed in the cell frames so that the upper ends of the battery cans all face the same direction, and the cell frames are joined to each other so that the top caps of the cylindrical battery cells face each other, a BMS assembly joined to one side of the two cell module assemblies, and a pack case that houses the two cell module assemblies and the BMS assembly together.

[0029] Each of the cell frames includes a top plate portion of the cell frame that is the surface facing the top cap of the cylindrical battery cell, and the top plate portion of any one of the cell frames may have one or more protrusions protruding in the joining direction, and the top plate portion of the other cell frame may have one or more spacing columns protruding in the joining direction and arranged so that the protrusions can be fitted inside.

[0030] According to yet another aspect of the present invention, there can be provided an electric scooter including the battery pack described above.

[0031] According to yet another aspect of the present invention, there can be provided an electric vehicle including the battery pack described above. [Effects of the Invention]

[0032] According to one aspect of the present invention, it is possible to provide a cell module assembly and a battery pack including the same, in which cylindrical battery cells can be accommodated in a single cell frame and the cylindrical battery cells can be accommodated and fixed in the single cell frame without contact with each other or looseness.

[0033] According to another aspect of the present invention, it is possible to provide a cell module assembly having excellent electrical safety and heat dissipation properties, and a battery pack including the same.

[0034] Therefore, in a battery pack according to one aspect of the present invention, components for electrical connection and components for voltage / temperature sensing are located in the central region inside the pack case, thereby increasing durability against external impact and electrical safety, and the bottom surfaces of all battery cells are located on the wall side of the pack case, thereby enabling effective heat dissipation.

[0035] The effects of the present invention are not limited to the effects described above, and other effects not mentioned will be clearly understood by those skilled in the art to which the present invention pertains from this specification and the accompanying drawings. [Brief explanation of the drawings]

[0036] [Figure 1] FIG. 1 shows two cell module assemblies CMA included in a prior art battery pack. [Figure 2] 1 is a schematic cross-sectional view of a cell frame included in a cell module assembly according to the prior art. [Figure 3] 1 is a perspective view of a battery pack according to an embodiment of the present invention; [Figure 4] FIG. 4 is a partially exploded perspective view of the battery pack of FIG. 3. [Figure 5] FIG. 5 is a perspective view showing two cell module assemblies and a BMS assembly in FIG. 4. [Figure 6] 1 is a cross-sectional view of a battery pack according to an embodiment of the present invention. [Figure 7] FIG. 6 is a perspective view of the first cell module assembly of FIG. 5. [Figure 8] FIG. 8 is a diagram showing a cell frame of the first cell module assembly of FIG. 7. [Figure 9] 9 is a diagram showing an embodiment in which a battery cell is housed in the cell frame of FIG. 8. FIG. [Figure 10] FIG. 10 is a partially enlarged view of FIG. [Figure 11] 4 is a photograph showing a difference in gap between battery cells caused by a dimensional tolerance of a cell holder of a cell frame according to an embodiment of the present invention. [Figure 12] FIG. 2 is a perspective view of a cell spacer according to one embodiment of the present invention. [Figure 13] 13 is a diagram showing the cell spacer of FIG. 12 applied to the embodiment of FIG. 9. [Figure 14] FIG. 14 is a partially cutaway perspective view taken along the line AA' of FIG. [Figure 15]15 is a diagram showing a heat transfer member disposed on the bottom surface of the battery can in FIG. 14. FIG. [Figure 16] FIG. 2 is a view of the top plate portion of the cell frame according to an embodiment of the present invention. [Figure 17] 17 is a view showing a part of the top plate and side surface of the cell frame of FIG. 16. FIG. [Figure 18] 18 is a view of the top plate and side surface of the cell frame of FIG. 17 viewed from another angle. [Figure 19] FIG. 19 is a perspective view of the sensing unit of FIG. 18. [Figure 20] FIG. 20 is a side view of the sensing unit of FIG. 19. [Figure 21] FIG. 2 shows two cell module assemblies according to one embodiment of the present invention before assembly. [Figure 22] FIG. 2 shows two cell module assemblies according to one embodiment of the present invention after assembly. [Figure 23] FIG. 23 is a diagram showing the state in which a BMS assembly is attached to the two cell module assemblies of FIG. 22. DETAILED DESCRIPTION OF THE INVENTION

[0037] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms and words used in the specification and claims should not be construed as being limited to their ordinary or dictionary meanings, but should be construed as having meanings and concepts corresponding to the technical ideas of the present invention, in accordance with the principle that the inventors themselves can appropriately define the concepts of terms in order to best explain the invention.

[0038] Therefore, it should be understood that the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent the entire technical idea of the present invention, and that there may be various equivalents and modifications that can be substituted therefor at the time of this application.

[0039] FIG. 3 is a perspective view of a battery pack according to one embodiment of the present invention, FIG. 4 is a partially exploded perspective view of the battery pack of FIG. 3, FIG. 5 is a perspective view showing two cell module assemblies and a BMS assembly in FIG. 4, and FIG. 6 is a cross-sectional view of a battery pack according to one embodiment of the present invention.

[0040] 3 to 6, a battery pack 10 according to one embodiment of the present invention includes a cell module assembly 100, a BMS assembly 200, and a pack case 300.

[0041] The pack case 300 includes a middle case 310, an upper cover 320, and a lower cover 330. The middle case 310 may be hollow and open at its upper and lower ends, allowing the cell module assembly 100 and the BMS assembly 200 coupled thereto to be integrally fitted therein in a sliding manner. The upper cover 320 and the lower cover 330 may be coupled to the open upper and lower ends of the middle case 310, respectively, and configured to cover the upper and lower ends of the middle case 310. The middle case 310 may be made of a material that has high mechanical rigidity and excellent heat dissipation properties to protect the cell module assembly 100 and the BMS assembly 200 from external impact, such as a metal material such as aluminum (A1).

[0042] A battery pack 10 according to an embodiment of the present invention may be configured to accommodate two cell module assemblies 100 coupled together in the pack case 300, as shown in FIG. 5 . Each of the two cell module assemblies 100 includes a plurality of battery cells 110. Here, the battery cells 110 may be cylindrical secondary batteries. The cylindrical battery cell 110 may be formed by filling a cylindrical battery can with an electrolyte and an electrode assembly, disposing a top cap 112 on the open end of the battery can, and crimping the open end of the battery can to seal it. The cylindrical battery cell 110 may have an electrode assembly wound into a jelly-roll shape, with a separator sandwiched between a positive electrode plate and a negative electrode plate. A positive electrode tab may be attached to the positive electrode plate, and the positive electrode tab may be connected to the top cap 112. A negative electrode tab may be attached to the negative electrode plate, and the negative electrode tab may be connected to the battery can.

[0043] Furthermore, in the battery pack 10 according to one embodiment of the present invention, the two cell module assemblies 100 may be configured so that the top caps 112 of the cylindrical battery cells 110 face each other. Referring to FIGS. 4 to 6, the two cell module assemblies 100 may be configured so that the top caps 112 of each battery cell 110 face the center of the battery pack 10 and the bottom surfaces 111b of the battery cans of each battery cell 110 face the outer side of the battery pack 10. More specifically, the two cell module assemblies 100 include a first cell module assembly 100A on the left side and a second cell module assembly 100B on the right side in FIG. 5, and the first cell module assembly 100A may be arranged so that the top caps 112 of all the cylindrical battery cells 110 included therein face the right side and the bottom surfaces 111b of the battery cans face the left side, as shown in FIG. The second cell module assembly 100B may be arranged such that the top caps 112 of all cylindrical battery cells 110 contained therein face left and the bottom surfaces of the battery cans face right.

[0044] With this configuration, the battery pack 10 according to the present invention has electrical connection components and voltage / temperature sensing components located in the central region of the battery pack 10, thereby improving durability against external impacts and electrical safety. Furthermore, the bottom surfaces 111b of all of the cylindrical battery cells 110 included in the two cell module assemblies 100A and 100B can be arranged closely facing the wall of the middle case 310, allowing heat from the cylindrical battery cells 110 to be easily dissipated to the middle case 310. Furthermore, by disposing a thermally conductive material or a heat dissipation pad 170 in the space between the bottom surfaces of the cylindrical battery cells 110 and the middle case 310, heat can be more quickly dissipated from the cylindrical battery cells 110 to the middle case 310. The battery pack 10 according to the present invention has a simple yet highly effective heat dissipation structure for the battery cells 110.

[0045] The cell module assembly 100 according to the present invention included in the battery pack 10 as described above will be described in more detail below.

[0046] Figure 7 is an oblique view of the first cell module assembly 100A of Figure 5, Figure 8 is a diagram showing the cell frame 120 of the first cell module assembly 100A of Figure 7, and Figure 9 is a diagram showing an embodiment in which a battery cell 110 is housed in the cell frame 120 of Figure 8.

[0047] The first cell module assembly 100A and the second cell module assembly 100B included in the battery pack 10 of the present invention have substantially similar main configurations, and therefore, with regard to the above main configurations, the description of the first cell module assembly 100A shall supersede the description of the second cell module assembly 100B.

[0048] 7 to 9, a cell module assembly 100 according to one embodiment of the present invention includes a plurality of battery cells 110, a cell frame 120, a bus bar plate 130, and a sensing unit 140.

[0049] As described above, the plurality of battery cells 110 are cylindrical secondary batteries in which top caps 112 are attached to the upper ends of the battery cans, and are housed in the cell frame 120 so that the upper ends of the battery cans, i.e., the top caps 112 side, all face the same direction. Each of the battery cells 110 may be arranged upright inside the cell frame 120 with the upper end of the battery can partially fitted and held in a cell holder 121a inside the cell frame 120.

[0050] The cell frame 120 is formed in the shape of a single square box capable of storing the plurality of battery cells 110 upright inside. The cell frame 120 according to the present invention has the advantage of being cheaper to manufacture and simplifying the assembly process of the cell module assembly 100 compared to conventional cell frames that are divided into an upper part a1 and a lower part a2 as shown in Figures 1 and 2.

[0051] 7 and 8, the cell frame 120 includes a storage section 121 that forms a space capable of storing multiple cylindrical battery cells 110 upright, a top plate section 122 located toward the upper end of the battery can, an opening section 123 located toward the lower end of the battery can, and side sections 124 that form walls on four sides.

[0052] The receiving portion 121 refers to the internal space of the cell frame 120 surrounded by the top plate portion 122 and the side plate portion 124, and may be configured to have a height corresponding to the length (or height) of the battery cell 110. In other words, the cell frame 120 of this embodiment is formed such that the side plate portions 124 on all four sides extend by an amount corresponding to the length of the cylindrical battery cell 110. Therefore, the distance between the cell frame opening portion 123 and the cell frame top plate portion 122 of the cell frame 120 can correspond to the length of the cylindrical battery cell.

[0053] 9, the top plate 122 of the cell frame refers to a plate surface on one side of the cell frame 120 that supports the battery cell 110 from below the top cap 112 when the battery cell 110 is upright with the top cap 112 facing downward, and has a terminal connection hole 122a. The terminal connection hole 122a may be configured so that the upper ends of the battery cans of all the battery cells 110 are partially exposed to the outside of the top plate 122 of the cell frame. Through the terminal connection hole 122a, when all the battery cells 110 are accommodated inside the cell frame 120, the top cap 112 and the upper edge 111a of the battery can of each battery cell 110 can be partially exposed to the outside of the top plate 122 of the cell frame.

[0054] In the case of a cylindrical battery cell 110, the positive electrode tab connected to the electrode assembly inside is connected to the top cap 112, and the negative electrode tab is connected to the battery can, with the top cap 112 functioning as the positive electrode terminal of the battery cell 110 and the battery can functioning as the negative electrode terminal (for reference, in some cylindrical battery cells, the battery can is wrapped in an insulating sheet so that only the bottom and / or upper edge of the battery can functions as the negative electrode terminal). Such cylindrical battery cells 110 can be connected in series and / or parallel by connecting the top cap 112 or upper edge 111a of each battery cell 110 to a bus bar plate 130 disposed on the outer surface of the top plate portion 122 of the cell frame in a predetermined pattern. The electrical connection configuration of the battery cells 110 will be described in detail below.

[0055] The opening 123 of the cell frame is located on the opposite side of the top plate 122 of the cell frame, and only the edge of the outer shell remains, with the inside of the edge of the outer shell being open, as shown in Fig. 8. During the assembly process of fitting the cylindrical battery cell 110 into such a cell frame 120, the opening 123 of the cell frame 120 can be oriented upward, and the cylindrical battery cell 110 can be fitted into the cell frame 120 as a whole using a cell fitting jig (not shown).

[0056] 9, if all of the cylindrical battery cells 110 are fitted into the cell frame 120 so that the bottom surfaces 111b of the battery cans face the openings 123 of the cell frame, the bottom surfaces 111b of all of the battery cells 110 can be exposed to the outside of the cell frame 120 through the openings 123. In this way, housing the battery cells 110 in the cell frame has the advantage that heat from the battery cells 110 can be easily dissipated toward the bottom surfaces 111b of the battery cans.

[0057] Meanwhile, the cell frame 120 includes a cell holder 121a for fixing the battery cell 110 therein. The cell holder 121a may be formed in a structure that surrounds at least a portion of the upper end of the battery can.

[0058] 8, the cell holder 121a may be configured to protrude from the top plate portion 122 of the cell frame 120 toward the opening portion 123 and surround the upper end of the battery can up to a predetermined height. The height or depth of the cell holder 121a may be formed to be lower than the middle height of the cylindrical battery cell 110.

[0059] By fitting a cylindrical battery cell 110 into each of these cell holders 121a, the cylindrical battery cell 110 can be housed in the cell frame 120 while standing and held in a predetermined position, as shown in Figure 9.

[0060] In this way, when the cylindrical battery cells 110 are accommodated in the accommodation section 121 of the cell frame 120, a predetermined gap can be formed between the cylindrical battery cells 110, as shown by "G" in Figure 10.

[0061] Basically, the cylindrical battery cells 110 are fitted into and held in the cell holder 121a, but if, for example, the outer diameter of the cylindrical battery cells 110 is smaller than normal, or if the inner diameter of the cell holder 121a is larger than normal, applying force (with fingers) to two adjacent cylindrical battery cells 110, as in Boundary #2 (Boundary #1) in Figure 11, the battery cells may move freely, causing the gap to narrow to "G1" compared to the initial gap (when no force is applied). In contrast, if the outer diameter of the cylindrical battery cell 110 and the inner diameter of the cell holder 121a are both normal dimensions, or if the outer diameter of the cylindrical battery cell 110 is larger than the inner diameter of the cell holder 121a but is large enough to tightly fit the cylindrical battery cell 110 into the cell holder 121a, even if force is applied (by fingers) to two adjacent cylindrical battery cells 110 as in Boundary #2 in Figure 11, even if the battery cells 110 tilt, the gap will hardly narrow as in "G2" or there will be no loose movement.

[0062] However, the battery cells 110 included in the cell module assembly 100 have slightly different dimensions, and in particular, in the case of the battery cell corresponding to boundary #1 in Figure 11, if an external force (shock or vibration) is applied, the battery cells will have greater mobility, which may cause electrical connections to break or increase the risk of short circuits.

[0063] [Table 1] In more detail, as shown in Table 1, cylindrical battery cells and cell frames may have dimensional tolerances during manufacturing, and in the case of a cylindrical battery cell, its outer diameter may be 21.00 mm to 21.15 mm, and in the case of the cell holder 121a of the cell frame 120, its inner diameter may be 21.00 mm to 21.20 mm.

[0064] As shown in column 2 of Table 1 above, if the outer diameter of the cylindrical battery cell 110 and the inner diameter of the cell holder 121a are at the same center value, the cylindrical battery cell 110 can be easily fitted into the cell holder 121a, and even if the cylindrical battery cell 110 tilts, a gap of just 1.0 mm can be ensured between the cylindrical battery cells 110. As shown in column 3 of Table 1, if the outer diameter of the cylindrical battery cell 110 is at its maximum value and the inner diameter of the cell holder 121a is at its minimum value, the cylindrical battery cell 110 is tightly fitted into the cell holder 121a and cannot move, and a gap of just 1.2 mm can be ensured between the cylindrical battery cells 110. Finally, as shown in column 4 of Table 1, if the outer diameter of the cylindrical battery cell 110 is at its minimum value and the inner diameter of the cell holder 121a is at its maximum value, the cylindrical battery cell 110 will be most loosely fitted into the cell holder 121a, increasing the likelihood of it moving freely even with a small external impact.As a result, if the battery cells 110 tilt, there is a risk that the gap between the cylindrical battery cells 110 will narrow to 0.4 mm.

[0065] Therefore, in a cell module assembly 100 including cylindrical battery cells 110 and cell holders 121a having the dimensions of the four columns in Table 1, there is a risk that the cylindrical battery cells 110 may move loosely and tilt when subjected to external impact or vibration, which may result in a break or short circuit of the metal wire W at the electrical connection point (the upper end side of the battery can).

[0066] 12 and 13, the cell module assembly 100 according to an embodiment of the present invention includes a cell spacer 150. The cell spacer 150 is a component that wraps around all or part of the bottom end of the battery can and is coupled to the opening 123 of the cell frame 120 to prevent the battery cells 110 from moving loosely and maintain a constant spacing.

[0067] The cell spacer 150 may be formed in the shape of a plate from an insulating material, and includes a plurality of spacer holes 151 wrapped around the bottom end of the battery can, and a spacer edge portion snap-fitted to the outer edge of the opening 123 of the cell frame 120.

[0068] The spacer hole 151 may have a diameter corresponding to the diameter of the battery can and may be formed to wrap around the bottom end of the battery can. Preferably, the spacer hole 151 may be formed to have a diameter corresponding to the battery cell 110 having the maximum outer diameter of the cylindrical battery cell 110 within the dimensional tolerance range. That is, in this embodiment, the spacer hole 151 may be formed to have a diameter that wraps around the bottom end of the battery can of a battery cell 110 having an outer diameter of 21.15 mm.

[0069] The spacer edge portion may include a first edge portion 155a, a second edge portion 155b, a third edge portion 155c, and a fourth edge portion 155d, as in the embodiment of Figure 12, and may be configured to fit into the outer edge portion of the opening portion 123 of the cell frame 120.

[0070] As described above, in the cell module assembly 100 of this embodiment (see FIG. 9 ), the battery cells 110 are arranged upright with the bottom surfaces 111b of the battery cans facing the openings 123 of the cell frame, with the upper ends of the battery cans fitted into the cell holders 121a and held in place. A cell spacer 150 is attached to the lower ends of the battery cells 110. At this time, the lower ends of the battery cans of the battery cells 110 are partially fitted into the spacer holes 151 and held therein, and the bottom surfaces 111b of the battery cans may be exposed to the outside.

[0071] In addition, the cell spacer 150 may further include an arc-shaped hole 153 in the edge region, and the arc-shaped hole 153 may be configured to partially wrap around the lower end of the cylindrical battery cell 110 arranged in the outer casing of the cell frame 120 to prevent movement of the cylindrical battery cell 110 arranged in the outer casing.

[0072] 13 , the first edge 155a is fitted into the left open end of the opening 123 of the cell frame, and the second edge 155b is fitted into the right open end of the opening 123 of the cell frame, thereby being fixed to the cell frame 120. In this case, the third edge 155c is arranged to contact the lower end of the battery cell 110 arranged at the outermost edge in the +Z direction of the cell frame, thereby preventing the outermost battery cell 110 in the +Z direction from moving in the -Z direction, and the fourth edge 155d is arranged to contact the lower end of the battery cell 110 arranged at the outermost edge in the -Z direction of the cell frame 120, thereby preventing the outermost battery cell 110 in the -Z direction from moving in the +Z direction.

[0073] 14, the assembly structure of the cell frame 120 and the cell spacer 150 will be described in more detail. The outer edge of the opening 123 of the cell frame includes a first outer edge 123a that is horizontal with the bottom surface 111b of the battery can, and a second outer edge 123b that is lower than the first outer edge 123a and forms a step corresponding to the thickness T1 of the cell spacer 150. When the difference in height between the top surfaces of the first outer edge 123a and the second outer edge 123b is "T2" in FIG. 14, T2 may be approximately the same as the thickness T1 of the cell spacer 150.

[0074] The cell spacer 150 may be fitted into the opening 123 of the cell frame 120 such that the spacer hole 151 surrounds the lower end of the battery can, indicated by "P1", located below the bottom surface 111b of the battery can, and the ends of the first edge 155a and the second edge 155b contact the stepped surfaces of the opposing outer edges of the cell frame 120. A portion of the lower surface of the first edge 155a may be placed on the second outer edge 123b on the left side of the opening 123 of the cell frame 120, and a portion of the lower surface of the second edge 155b may be placed on the second outer edge 123b on the right side of the opening 123 of the cell frame 120.

[0075] As described above, by applying the cell spacer 150 to the opening 123 of the cell frame, not only is the upper end of the battery can of the battery cell 110 fitted and held in the cell holder 121a, but the lower end of the battery can is also held by the cell spacer 150. Therefore, even if an external shock or vibration is applied to the cell module assembly 100, loose movement of the battery cell 110 can be suppressed, and the electrical safety and durability of the cell module assembly 100 can be improved.

[0076] FIG. 15 is a diagram showing a heat transfer member disposed on the bottom surface of the battery can in FIG.

[0077] Referring to FIG. 15, a cell module assembly 100 according to one embodiment of the present invention may further include a screen plate 160 and a heat dissipation pad 170 .

[0078] The screen plate 160 is a component that supports the lower end of the battery cell 110 and promotes heat absorption of the battery cell 110, covers the cell spacer 150 and the bottom surface 111b of the battery can, and may be coupled to the cell frame 120. The screen plate 160 may be a metal plate made of a material with excellent thermal conductivity, for example, aluminum (Al).

[0079] The screen plate 160 and the bottom surface 111b of the battery can may be adhesively fixed to each other. This configuration may increase contact and thermal conductivity between the screen plate 160 and the battery cell 110. For reference, the screen plate 160 and / or the bottom surface 111b of the battery can may be electrically insulated by an insulating film or an insulating coating.

[0080] The heat dissipation pad 170 may be disposed such that one side thereof contacts the screen plate 160. The heat dissipation pad 170 may be made of a compressible material having excellent thermal conductivity.

[0081] As described above, the cell module assembly 100 includes the screen plate 160 and the heat dissipation pad 170 on the open portion 123 side of the cell frame 120, so that the heat dissipation pad 170 can be configured to come into contact with the middle case 310 when inserted into the pack case 300, as shown in Fig. 6. Therefore, the cell module assembly 100 can effectively dissipate heat generated from the battery cells 110 from the bottom surface 111b of the battery can to the middle case 310 via the screen plate 160 and the heat dissipation pad 170, thereby increasing heat dissipation capacity.

[0082] Figure 16 is a view of the top plate portion of a cell frame according to one embodiment of the present invention, Figure 17 is a view showing a portion of the top plate portion and side portion of the cell frame of Figure 16, and Figure 18 is a view of the top plate portion and side portion of the cell frame of Figure 17 viewed from another angle.

[0083] Next, based on Figures 16 to 18, we will describe the electrical connection configuration and voltage / temperature sensing configuration of the battery cells 110 arranged on the top plate portion 122 and side portion 124 of the cell frame in the cell module assembly 100 according to one embodiment of the present invention.

[0084] As shown in Fig. 16, multiple bus bar plates 130 may be arranged on one outer surface of the cell frame 120, in other words, on the top plate portion 122 of the cell frame. For example, a positive bus bar plate 130(+) may be arranged at the end in the +Z direction in Fig. 16, and a negative bus bar plate 130(-) may be arranged at the end in the -Z direction, with the bus bar plates 130 arranged at predetermined intervals in the ±Z directions between the positive bus bar plate 130(+) and the negative bus bar plate 130(-). Furthermore, the bus bar plates 130 may be arranged in a shape extending linearly or staggered in the ±Y directions to avoid the positions of terminal connection holes 122a or protrusions 122f formed on the top plate portion 122 of the cell frame.

[0085] The bus bar plates 130 are wire-bonded to the top caps 112 of the battery cells 110 or the upper rims 111a of the battery cans exposed through the terminal connection holes 122a, thereby electrically connecting the battery cells 110. Here, wire bonding refers to ultrasonically crimping both ends of a metal wire W to objects to be bonded. However, ultrasonic waves are not necessarily used for wire bonding, and other bonding techniques, such as laser welding, may also be used.

[0086] Specifically, the six battery cells 110 indicated by "C1" in Fig. 19 have their top caps 112 wire-bonded to the positive bus bar plate 130(+), and the upper edge 111a of the battery can is wire-bonded to the second bus bar plate 130 adjacent to the positive bus bar plate 130(+) in the -Z direction, as shown in Fig. 16. The six battery cells 110 indicated by "C2" in Fig. 19 have their top caps 112 wire-bonded to the second bus bar plate 130, and the upper edge 111a of the battery can is wire-bonded to the third bus bar plate 130 adjacent to the positive bus bar plate 130(+) in the -Z direction, as shown in Fig. 16. 19. The top caps 112 or upper rims 111a of the battery cans of the battery cells 110 are wire-bonded to the corresponding bus bar plates 130 in this pattern, and finally, the upper rims 111a of the battery cans of the last six battery cells 110, designated by "C7" in FIG. 19, are wire-bonded to the negative bus bar plate 130(-). This allows the battery cells 110 included in the cell module assembly 100 to be connected in series and parallel in a 7S6P configuration. The positive bus bar plate 130(+) functions as the positive terminal of the cell module assembly 100, and the negative bus bar plate 130(-) functions as the negative terminal of the cell module assembly 100.

[0087] 17 to 20, a sensing unit 140 according to an embodiment of the present invention includes a printed circuit board 141, a plurality of sensing plates 142, and a temperature sensing member 143. The sensing unit 140 is disposed on the other outer surface of the cell frame 120 that intersects with the top plate portion 122 of the cell frame, which has the electrical connection to the battery cell 110 configured as described above, and is electrically connected to the bus bar plate 130 by wire bonding to sense voltage information of the battery cell 110.

[0088] The printed circuit board 141 may be a rigid printed circuit board 141 or a flexible printed circuit board 141. The cell module assembly 100 in this embodiment includes a rigid printed circuit board 141 for enhanced durability, and the printed circuit board 141 has a circuit pattern for transmitting voltage information or temperature information of the battery cell 110. The printed circuit board 141 may be configured to be detachable from the side surface 124 of the cell frame 120. More specifically, as in the embodiment shown in FIGS. 17 and 18 , the printed circuit board 141 may be disposed on the side surface 124 of the cell frame 120, which intersects with the top plate 122 of the cell frame on which the bus bar plate 130 is disposed. In this case, the printed circuit board 141 may be configured such that its plate surface faces the side surface 124 of the cell frame 120, and the upper edge of the printed circuit board 141 is positioned at the same height as the top plate 122 of the cell frame.

[0089] In this way, the side portion 124 of the cell frame 120 includes a board mounting holder 127 that supports the printed circuit board 141 so that the printed circuit board 141 can be inserted to a predetermined depth so as to be aligned with the side portion 124 of the cell frame 120 and the board surface of the printed circuit board 141 is in close contact with the side portion 124 of the cell frame 120, so that the printed circuit board 141 is placed on the side portion 124 of the cell frame 120.

[0090] The substrate mounting holders 127 are arranged at predetermined intervals along the longitudinal direction (Z direction) of the cell frame 120 and can be provided on the side portion 124 of the cell frame 120 so as not to interfere with the temperature sensing member 143 or cable connector 146 on the printed circuit board 141.

[0091] The plurality of sensing plates 142 are components connected to the bus bar plate 130 by wire bonding to sense the voltage of each bank of battery cells 110 (battery cells 110 connected in parallel). The plurality of sensing plates 142 may be provided in a number corresponding to the bus bar plates 130 one-to-one and connected to the corresponding bus bar plates 130 by wire bonding. The sensing plates 142 may be made of an electrically conductive metal such as nickel, copper (Cu), or silver (Ag).

[0092] The multiple sensing plates 142 may be provided in a structure that is folded at least once, with one side fixedly connected to the printed circuit board 141 and the other side arranged to be aligned with the surface of the top plate portion 122 of the cell frame 120 on which the bus bar plate 130 is arranged.

[0093] For example, the plurality of sensing plates 142 are made of an electrically conductive metal material, are formed in a roughly "┐" or "L" shape, and can be coupled to a printed circuit board 141 as in the embodiment shown in Figures 19 and 20. More specifically, the sensing plates 142 include a board connection portion 142a that faces the plate surface of the printed circuit board 141, and a frame mounting portion 142b that is bent and extends from the board connection portion 142a and can be positioned to face the peripheral edge of one outer surface of the cell frame 120. With this configuration, as shown in Figure 18, when the printed circuit board 141 is inserted into the board mounting holder 127 so as to be aligned with the side surface portion 124 of the cell frame, the frame mounting portion 142b of the sensing plate 142 can be positioned to face the peripheral edge of the top panel portion 122 of the cell frame.

[0094] 16 to 18 , the frame mounting portions 142b of the sensing plates 142 may be arranged on the periphery of the cell frame 120, alternating with one end of the bus bar plates 130. According to the above configuration, the sensing plates 142 may be arranged adjacent to one end of the corresponding bus bar plates 130 without interfering with the wire bonding areas connecting the bus bar plates 130 and the battery cells 110, which are widely distributed in the inner peripheral area of the top panel portion 122 of the cell frame. Therefore, any number of short metal wires W may be used to connect the sensing plates 142 and the bus bar plates 130. Furthermore, the bus bar plates 130 and the sensing plates 142 may be connected by two metal wires W. In this case, voltage sensing can be performed even if one of the metal wires W2 is shortened, thereby improving the reliability and durability of the voltage sensing.

[0095] According to this embodiment, the metal wires W connecting the battery cells 110 and the bus bar plate 130, or the sensing plate 142 and the bus bar plate 130, may have a diameter of 0.12 mm to 0.8 mm and a length of 5 mm to 10 mm and may be made of aluminum. With the above configuration, the metal wires W can function as a fuse in the event of a short circuit outside the battery pack 10. For example, in the cell module assembly 100 according to this embodiment, the metal wires W are configured as described above. When a current of, for example, 47.4 A or more flows, all of the metal wires W of the battery cells 110 in at least one bank are broken, thereby cutting off the flow of current to the cell module assembly 100. It should be noted, however, that the scope of the present invention is not limited in any way to the diameter, length, or material of the metal wires W. The diameter and length of the metal wires W can be selected as needed, and metals such as copper and nickel can be used as materials for the metal wires W.

[0096] 19, the temperature sensing member 143 includes two temperature sensing members 143A and 143B having different lengths. Of the two temperature sensing members 143A and 143B, the relatively longer temperature sensing member 143 is the first temperature sensing member 143A used to measure the temperature at the center of the cell module assembly 100, and the relatively shorter temperature sensing member 143 is the second temperature sensing member 143B used to measure the temperature at the outer periphery of the cell module assembly 100.

[0097] The first temperature sensing member 143A includes a first cable 144a extending a predetermined length from the printed circuit board 141 and a first thermistor 144b coupled to an end of the first cable 144a. The second temperature sensing member 143B includes a second cable 145a extending a predetermined length from the printed circuit board 141 and a second thermistor 145b coupled to an end of the second cable 145a. The first cable 144a is longer than the second cable 145a, and the first cable 144a and the second cable 145a are arranged to extend in opposite directions.

[0098] The battery pack 10 needs to accurately sense the heat generated by the battery cells 110 during charging and discharging and to manage the charging and discharging or cool them based on that sense. Otherwise, the battery cells 110 will deteriorate at an accelerated rate, resulting in a decrease in performance. Therefore, in order to effectively manage the heat of the battery cells 110 included in the cell module assembly 100, it is necessary to accurately grasp the temperatures of the hottest and coldest battery cells 110 among the battery cells 110. When the battery cells 110 are housed in a cell frame 120, as in the cell module assembly 100 of the present embodiment, the temperature of the battery cells in the central region inside the cell frame is high due to a central heat island phenomenon, and the temperature of the battery cells gradually decreases as they move toward the outer region.

[0099] For this reason, the cell module assembly 100 according to one embodiment of the present invention is configured so that the temperature of the battery cell 110 in the central region, which has the highest temperature inside the cell frame 120, can be measured by the first temperature sensing member 143A. For example, the cell module assembly 100 is configured so that the first thermistor 144b can be inserted from the outside to the inside of the cell frame 120 by forming a temperature sensing hole 122b on the surface of the top plate 122 of the cell frame so that the battery cell 110 with the highest temperature comes into contact with the first thermistor 144b.

[0100] Specifically, referring to FIG. 17, a temperature sensing hole 122b may be provided in the top plate portion 122 of the cell frame 120 corresponding to the central region of the cell frame 120, and the first thermistor 144b of the first temperature sensing member 143A is inserted into the inside of the cell frame 120, i.e., the receiving portion 121 of the cell frame 120, through the temperature sensing hole 122b, and contacts the outer edge of the battery cell 110 in the central region of the cell frame 120 to sense its temperature.

[0101] In this case, a portion of the first cable 144a of the first temperature sensing member 143A is routed from the periphery of the top plate 122 of the cell frame to the temperature sensing hole 122b. In this embodiment, a plurality of cable guide ribs 122c, 122d, and 122e are protruding from the top plate 122 of the cell frame, allowing the first cable 144a to be routed in a straight line from the periphery of the top plate 122 of the cell frame to the temperature sensing hole 122b without the need for bending. The plurality of cable guide ribs 122c, 122d, and 122e may be configured to protrude above the linear routing path of the first cable 144a, as shown in the embodiment of FIG. 17 . In particular, the plurality of cable guide ribs 122c, 122d, and 122e include a lead-in portion support rib 122e provided in the vicinity of the temperature sensing hole 122b. The lead-in portion support rib 122e serves to support the portion of the first cable 144a immediately before it is led into the temperature sensing hole 122b so as to be spaced a predetermined height from the surface of the top plate portion 122 of the cell frame.

[0102] According to the above configuration, there is no need to bend the first cable 144a to avoid interference with the upper end of the battery cell 110, the bus bar plate 130, or the metal wire W, which are exposed on the top plate portion 122 of the cell frame. That is, the first cable 144a can be separated from the surface of the top plate portion 122 of the cell frame by the plurality of cable guide ribs 122c, 122d, and 122e and routed in a straight line above the upper end of the battery cell 110, the bus bar plate 130, or the metal wire W. Furthermore, the plurality of cable guide ribs 122c, 122d, and 122e prevent the first cable 144a from moving left and right, which has the effect of preventing the first thermistor 144b from moving out of its fixed position.

[0103] Meanwhile, the second temperature sensing member 143B may be configured to measure the temperature of one of the battery cells 110 located in the outer region of the cell module assembly 100.

[0104] 18, the side surface 124 of the cell frame 120 intersecting with the top plate 122 of the cell frame has a side cutout 128. The battery cell 110 located inside the cell frame 120, i.e., at the outermost edge of the receiving portion 121, can have a side exposed to the outside through the side cutout 128.

[0105] The second cable 145a of the second temperature sensing member 143B extends from the printed circuit board 141 to the position of the side cutout hole 128, and the second thermistor 145b may be configured to contact the side of the battery cell 110 exposed through the side cutout hole 128. In this case, a thermally conductive adhesive (not shown) may be used to stably fix the second thermistor 145b to the side of the battery cell 110.

[0106] According to the above configuration, it is possible to measure the temperature of the battery cells 110 located in the central region and the outer region among the battery cells 110 included in the cell module assembly 100, and also the assembly of the first and second temperature sensing members 143A, 143B can be performed very easily and simply.

[0107] The voltage sensing and temperature sensing configuration described above enables voltage information and temperature information of the battery cells 110 included in the cell module assembly 100 to be sensed, and the voltage information and temperature information can be transmitted from the printed circuit board 141 to the BMS assembly 200 via the cable connector 146.

[0108] Next, the assembly structure of two cell module assemblies according to one embodiment of the present invention will be described.

[0109] 21 and 22 show two cell module assemblies according to one embodiment of the present invention before and after assembly, and FIG. 23 shows the two cell module assemblies of FIG. 22 with a BMS assembly attached thereto.

[0110] As mentioned above, the battery pack 10 according to one embodiment of the present invention includes two cell module assemblies 100.

[0111] The two cell module assemblies 100A, 100B may be configured such that the cell frames 120 thereof are combined together so that the top plate portions 122 of the cell frames thereof face each other.

[0112] 21, the top plate portion 122 of one of the two cell frames 120 may have one or more protrusions 122f protruding in the assembly direction, and the top plate portion 122 of the remaining cell frame may have one or more spacing columns 122g protruding in the assembly direction and arranged so that the protrusions 122f can be fitted inside. That is, a plurality of the protrusions 122f may be provided on the top plate portion 122 of the cell frame of the first cell module assembly 100A, and the spacing columns 122g may be provided on the top plate portion 122 of the cell frame of the second cell module assembly 100B so that the number and positions of the protrusions 122f correspond to those of the protrusions 122f.

[0113] According to this configuration, as shown in FIG. 22, the protrusion 122f of the first cell module assembly 100A is coupled to the spacing column 122g of the second cell module assembly 100B by an interference fit. The coupled protrusion 122f and spacing column 122g allow the first cell module assembly 100A and the second cell module assembly 100B to be assembled without any relative movement while maintaining a fixed distance between them, as shown by "D1" in FIG. 22. Therefore, the wire bonding region on the top plate portion 122 of the cell frame of the first cell module assembly 100A and the wire bonding region on the top plate portion 122 of the cell frame of the second cell module assembly 100B do not come into contact with each other. Furthermore, as shown in FIG. 23, the two physically assembled cell module assemblies 100 can be directly connected to each other by an interconnection bus bar 180. Here, the interconnection bus bar 180 refers to a metal plate arranged to contact the positive bus bar plate 130(+) of the first cell module assembly 100A and the negative bus bar plate 130(-) of the second cell module assembly 100B. Therefore, the battery cells 110 included in the battery pack 10 according to this embodiment can be connected in series and in parallel in a 14S6P configuration.

[0114] The two cell module assemblies 100A and 100B may have a BMS assembly 200 attached to the lower side and may be slidably fitted into a middle case 310, an upper cover 320 may be attached to the upper end of the middle case 310, and a lower cover 330 may be attached to the lower end of the middle case 310.

[0115] According to the configuration of the battery pack 10 of the present invention, the top cap 112 of the battery cell 110 included in the first cell module assembly 100A faces the center of the battery pack 10, and the bottom surface of the battery can faces the outer side of the battery pack 10 (see FIG. 6). Similarly, the top cap 112 of the battery cell 110 included in the second cell module assembly 100B faces the center of the battery pack 10, and the bottom surface of the battery can faces the outer side of the battery pack 10.

[0116] Therefore, components such as the bus bar plate 130 for electrical connection or voltage / temperature sensing, the sensing unit 140, and the metal wire W are located in the central region of the pack case 300, which increases durability against external impacts and electrical safety. In addition, because the bottom surfaces of all of the cylindrical battery cells 110 included in the two cell module assemblies 100 are located close to the wall surface of the pack case 300, heat from the cylindrical battery cells 110 can be easily dissipated to the middle case 310.

[0117] Meanwhile, the battery pack according to the present invention can be applied to transportation means such as electric scooters, electric vehicles, etc. That is, an electric scooter or an electric vehicle according to the present invention may include one or more battery packs according to the present invention.

[0118] Although the present invention has been described above using limited embodiments and drawings, the present invention is not limited to these, and it goes without saying that various modifications and variations can be made by a person having ordinary knowledge in the technical field to which the present invention pertains within the technical spirit of the present invention and the scope of equivalents of the claims.

[0119] On the other hand, although directional terms such as up, down, left, and right are used in this specification, it will be obvious to those skilled in the art of the present invention that these terms are used merely for ease of explanation and may differ depending on the position of the object in question, the position of the observer, etc. [Explanation of symbols]

[0120] 10 Battery Pack 100 Cell Module Assembly 110 Cylindrical battery cell 112 Top Cap 120 Cell Frame 121 Storage unit 122 Top plate 123 Open area 124 Side part 127 Holder 128 Incision hole 130 Busbar Plate 140 Sensing Unit 141 Printed Circuit Board 142 Sensing Plate 146 Cable Connector 150 cell spacer 151 Spacer hole 153 holes 160 screen plate 170 Heat dissipation pad 180 Interconnection Busbar 200 BMS Assembly 300 pack case 310 Middle Case 320 Upper cover 330 Lower cover

Claims

1. a plurality of cylindrical battery cells each including a battery can and a top cap coupled to an upper end of the battery can; a cell frame having a housing section capable of housing the plurality of cylindrical battery cells upright therein and an open section on one side; a cell spacer that wraps around all or part of the bottom end of the battery can and is coupled to the open portion of the cell frame; Including, All of the plurality of cylindrical battery cells are the battery can is housed in the cell frame such that a lower end of the battery can faces the open portion of the cell frame and an upper end of the battery can faces a top plate portion of the cell frame that is located in the opposite direction to the open portion of the cell frame, the cell spacer is made of an insulating material, a spacer hole that wraps around the bottom end of the battery can; the spacer hole has a diameter corresponding to the diameter of the battery can; The plurality of cylindrical battery cells are the battery can is disposed inside the cell frame and supported by a cell holder that surrounds at least a portion of the upper end of the battery can, and is arranged to stand up; The cell frame is configured so that the distance between the open portion of the cell frame and the top plate portion of the cell frame corresponds to the length of the cylindrical battery cell.

2. the open portion of the cell frame includes a circumferential outer edge portion; The outer edge portion is a first outer edge portion that forms a surface horizontal with a bottom surface of the battery can; and a second outer edge portion that forms a step that is lower than the first outer edge portion by an amount corresponding to the thickness of the cell spacer, The cell module assembly according to claim 1 , wherein at least a portion of the edge of the cell spacer rests on the second outer edge.

3. The cell module assembly according to claim 2 , further comprising a screen plate covering the cell spacer and a bottom surface of the battery can and coupled to the cell frame.

4. The cell module assembly according to claim 3 , wherein the bottom surface of the battery can and the screen plate are adhesively fixed to each other.

5. a top plate portion of the cell frame having a terminal connection hole that partially exposes an upper end portion of the battery can; 2. The cell module assembly according to claim 1, wherein the cylindrical battery cells have upper edges of the top caps or battery cans exposed through the terminal connection holes and wire-bonded to a plurality of bus bar plates disposed on the outer surface of the top panel portion of the cell frame.

6. a sensing unit is provided on a side surface of the cell frame that intersects with an outer surface of the top plate portion of the cell frame; The sensing unit a printed circuit board detachably coupled to the cell frame; a plurality of sensing plates coupled to the printed circuit board and wire-bonded to the bus bar plates; a temperature sensing element coupled to the printed circuit board for measuring a temperature of one or more of the cylindrical battery cells spaced a predetermined distance apart; The cell module assembly of claim 5 , comprising:

7. The cell module assembly according to claim 6 , wherein the plurality of sensing plates are arranged in a number that corresponds one-to-one with the bus bar plates, and each sensing plate is connected to the corresponding bus bar plate by wire bonding.

8. Each of the plurality of sensing plates includes:

7. The cell module assembly of claim 6, wherein the cell module assembly is provided in a folded structure at least once, one side of which is fixedly connected to the printed circuit board, and the other side of which is arranged to be aligned with one side of the outer surface of the cell frame on which the bus bar plate is arranged.

9. Each of the plurality of sensing plates includes: a board connection portion attached to the printed circuit board; a frame mounting portion extending from the substrate connection portion and disposed on a peripheral edge of one surface of the outer side of the cell frame; The cell module assembly of claim 6 , comprising:

10. The cell module assembly according to claim 9 , wherein one end of the bus bar plate and the frame mounting portion of the sensing plate are arranged alternately adjacent to each other.

11. the temperature sensing member includes a first temperature sensing member having one end fitted into the cell frame; the first temperature sensing member includes a first cable extending a predetermined length from the printed circuit board and a first thermistor coupled to an end of the first cable; The cell module assembly according to claim 6 , wherein the first thermistor is fitted into the accommodating portion through a temperature sensing hole formed in a top plate portion of the cell frame, and is in contact with the cylindrical battery cell.

12. The cell module assembly according to claim 11 , wherein the cylindrical battery cell that the first thermistor contacts is one of the battery cells located in a central region inside the cell frame.

13. The top plate portion of the cell frame is The cell module assembly of claim 11, further comprising a plurality of cable guide ribs protruding above the linear wiring path of the first cable so that the wiring is routed linearly from the printed circuit board to the temperature sensing hole.

14. The plurality of cable guide ribs include: The cell module assembly of claim 13 , further comprising a pull-in support rib that supports the first cable at a point just before it is pulled into the temperature sensing hole so that the point is spaced a predetermined height from the surface of the top plate of the cell frame.

15. the temperature sensing member includes a second temperature sensing member having one end extending to a side cutout hole formed in another outer surface of the cell frame that intersects with the top plate portion of the cell frame; the second temperature sensing member includes a second cable extending a predetermined length from the printed circuit board and a second thermistor coupled to an end of the second cable; The cell module assembly according to claim 6 , wherein the second thermistor is arranged so as to contact the side of the battery cell located at the outermost periphery of the accommodating portion through the cutout hole in the side.

16. A battery pack comprising the cell module assembly according to any one of claims 1 to 15, the cylindrical battery cells are housed in the cell frame such that the upper ends of the battery cans all face the same direction; two cell module assemblies in which the cell frames are joined together so that the top caps of the cylindrical battery cells face each other; a BMS assembly coupled to one side of the two cell module assemblies; a pack case that integrally houses the two cell module assemblies and the BMS assembly; Including the battery pack.

17. each of the cell frames includes a top plate portion of the cell frame that faces the top cap of the cylindrical battery cell; 17. The battery pack according to claim 16, wherein a top plate portion of any one of the cell frames includes one or more protrusions protruding in the joining direction, and a top plate portion of the other cell frame includes one or more spacing columns protruding in the joining direction and configured so that the protrusions can be fitted inside.

18. 17. An electric scooter comprising the battery pack of claim 16.

19. 17. An electric vehicle comprising the battery pack of claim 16.

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