Cell assemblies and battery packs containing them

Abstract

The present invention relates to a cell assembly and a battery pack including the same. The cell assembly of the present invention includes a cell block including a plurality of cells, and a pair of reinforcing plates coupled to both side surfaces of the cell block so as to support both side surfaces of the cell block and including protrusions on the outer surfaces. The reinforcing plates include a first reinforcing plate coupled to one side of the cell block and a second reinforcing plate coupled to the other side of the cell block, and the outer surface of the first reinforcing plate and the outer surface of the second reinforcing plate have a shape that meshes with each other. Further, the battery pack of the present invention includes a cell assembly and a pack case including a housing portion in which the cell assembly is housed. The cell assembly includes a pair of reinforcing plates coupled to both sides so as to support the side surfaces. Any pair of cell assemblies housed adjacent to the housing portion are coupled such that the first reinforcing plate and the second reinforcing plate are combined to form one auxiliary partition wall.

Description

【Technical Field】 【0001】 The present invention relates to a cell assembly and a battery pack including the same. More specifically, the present invention relates to a cell assembly to which reinforcing plates supporting each side surface are applied on both sides, and a battery pack accommodating the same. 【0002】 This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0049575 filed on April 14, 2023, and all the contents disclosed in the literature of the Korean patent application are included as part of this specification. 【Background Art】 【0003】 Types of secondary batteries include lithium-ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel metal hydride batteries, nickel zinc batteries, and the like. The operating voltage of such a unit secondary battery cell, that is, a unit battery cell, is about 2.5V to 4.2V. Therefore, when a higher output voltage is required, a battery pack can also be configured by connecting a plurality of battery cells in series. Also, depending on the charge / discharge capacity required for the battery pack, a large number of battery cells can be connected in parallel to form a battery pack. Therefore, the number of battery cells included in the battery pack can be variously set according to the required output voltage or charge / discharge capacity. 【0004】 For example, when configuring a battery pack by connecting a plurality of battery cells in series / parallel, a cell assembly composed of a plurality of battery cells is first configured. 【0005】 FIG. 1 shows one form of a commonly used cell assembly 10. The conventional cell assembly 10 includes a cell block 11 in which a plurality of cells are stacked in one direction as shown in the figure, and end plates 12 are coupled to the front and rear of the cell assembly 10, respectively. 【0006】 A single battery pack can house multiple cell assemblies 10 as shown in Figure 1 above. 【0007】 On the other hand, abnormal phenomena may occur in the cell assembly 10 contained in the battery pack during the charging and discharging process, one example of which is the swelling phenomenon. The swelling phenomenon is a phenomenon in which the battery cells expand due to gases generated inside the battery cells. The swelling phenomenon may proceed first in each battery cell contained in the cell assembly 10, and as a result affects the entire cell assembly 10. In particular, the swelling phenomenon may proceed throughout the entire cell assembly 10. 【0008】 Therefore, there is a need for a new method that can suppress deformation of the cell assembly 10 to the greatest extent possible, even if swelling occurs in each cell assembly 10 housed in the pack case described above. [Prior art documents] [Patent Documents] 【0009】 [Patent Document 1] Korean Published Patent No. 10-2018-0113906 [Overview of the Initiative] [Problems that the invention aims to solve] 【0010】 Therefore, the present invention was devised to solve the above-mentioned problems and aims to provide a structure that can reinforce the sides of a cell assembly. 【0011】 Furthermore, the present invention aims to suppress the swelling phenomenon of cell assemblies housed in a pack case. 【0012】 Other objects and advantages of the present invention can be understood from the following description and will be more clearly seen from the embodiments of the present invention. Furthermore, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations thereof as set forth in the claims. [Means for solving the problem] 【0013】 The present invention provides a cell assembly comprising a cell block containing a plurality of cells, and a pair of reinforcing plates bonded to both sides of the cell block so as to support both sides of the cell block, the reinforcing plates having protrusions on their outer surfaces, wherein the reinforcing plates include a first reinforcing plate bonded to one side of the cell block and a second reinforcing plate bonded to the other side of the cell block, and the outer surfaces of the first reinforcing plate and the second reinforcing plate have interlocking shapes. 【0014】 The first reinforcing plate may include the protruding portion on the lower part of its outer surface and the upper stepped portion above the protruding portion, and the second reinforcing plate may include the protruding portion on the upper part of its outer surface and the lower stepped portion below the protruding portion. 【0015】 The first reinforcing plate includes a horizontal insertion bar on the upper part of its outer surface, and the second reinforcing plate includes a horizontal insertion hole on the upper part of its outer surface. The horizontal insertion hole of the second reinforcing plate may be formed corresponding to the horizontal insertion bar of the first reinforcing plate so that the horizontal insertion bar of the first reinforcing plate can be inserted into it. 【0016】 The first reinforcing plate further includes a horizontal insertion hole in the lower part of its outer surface, and the second reinforcing plate further includes a horizontal insertion bar in the lower part of its outer surface, and the horizontal insertion hole of the first reinforcing plate may be formed corresponding to the horizontal insertion bar of the second reinforcing plate so that the horizontal insertion bar of the second reinforcing plate can be inserted into it. 【0017】 The first reinforcing plate includes a horizontal insertion hole in the lower part of its outer surface, and the second reinforcing plate includes a horizontal insertion bar in the lower part of its outer surface. The horizontal insertion hole of the first reinforcing plate may be formed to correspond to the horizontal insertion bar of the second reinforcing plate so that the horizontal insertion bar of the second reinforcing plate can be inserted into it. 【0018】 The first reinforcing plate includes a vertical insertion bar in the upper stepped portion, and the second reinforcing plate includes a vertical insertion hole in the lower stepped portion. The vertical insertion hole in the second reinforcing plate may be formed corresponding to the vertical insertion bar of the first reinforcing plate so that the vertical insertion bar of the first reinforcing plate can be inserted into it. 【0019】 The first reinforcing plate further includes a vertical insertion hole in the upper stepped portion, and the second reinforcing plate further includes a vertical insertion bar in the lower stepped portion. The vertical insertion hole in the first reinforcing plate may be formed to correspond to the vertical insertion bar of the second reinforcing plate so that the vertical insertion bar of the second reinforcing plate can be inserted into it. 【0020】 The first reinforcing plate includes a vertical insertion hole in the upper stepped portion, and the second reinforcing plate includes a vertical insertion bar in the lower stepped portion. The vertical insertion hole in the first reinforcing plate may be formed to correspond to the vertical insertion bar of the second reinforcing plate so that the vertical insertion bar of the second reinforcing plate can be inserted into it. 【0021】 The above-mentioned protrusions may be extended along the longitudinal direction of the cell assembly. 【0022】 The above-mentioned protruding portion may have a hollow structure. 【0023】 The present invention provides a battery pack comprising a pack case including the above-mentioned cell assembly and a housing section in which the cell assembly is housed, wherein the cell assembly includes a pair of reinforcing plates joined on both sides to support the sides, and any pair of cell assemblies housed adjacent to the housing section are joined such that the first reinforcing plate and the second reinforcing plate are joined to form a single auxiliary partition wall. 【0024】 The auxiliary partition wall can be coupled to the pack case by a coupling member that penetrates the auxiliary partition wall and is coupled to the bottom of the pack case. 【0025】 The protruding portion includes a coupling hole through which the coupling member can penetrate, and the coupling holes included in the first reinforcing plate and the second reinforcing plate included in the auxiliary partition wall can be provided at corresponding positions to each other. 【0026】 The pack case includes a base plate that supports the lower part of the cell assembly. The base plate corresponds to the position of the coupling hole included in the auxiliary partition wall and includes a bottom groove formed so that the coupling member can be inserted. The auxiliary partition wall can be coupled to the base plate by the coupling member that penetrates the coupling hole and is inserted into the bottom groove. 【0027】 The first reinforcing plate includes the protruding portion at the lower part of the outer surface and includes an upper step portion formed by the protruding portion at the upper part of the protruding portion. The second reinforcing plate includes the protruding portion at the upper part of the outer surface and may include a lower step portion formed by the protruding portion at the lower part of the protruding portion. 【0028】 The first reinforcing plate includes a horizontal insertion bar at the upper part of the outer surface. The second reinforcing plate includes a horizontal insertion hole at the upper part of the outer surface. The first reinforcing plate of any one cell assembly included in the auxiliary partition wall can be coupled to the second reinforcing plate by inserting the horizontal insertion bar into the horizontal insertion hole included in the second reinforcing plate of another cell assembly. 【0029】 The first reinforcing plate includes a vertical insertion bar at the upper step portion. The second reinforcing plate includes a vertical insertion hole at the lower step portion. The first reinforcing plate of any one cell assembly included in the auxiliary partition wall can be coupled to the second reinforcing plate by inserting the vertical insertion bar into the vertical insertion hole included in the second reinforcing plate of another cell assembly. 【Advantages of the Invention】 【0030】 According to the present invention, the swelling phenomenon of cell assemblies housed in a pack case can be effectively suppressed. 【0031】 Furthermore, the present invention can improve the assembly efficiency of the pack case by removing a separate side wall configuration that separates the cell assemblies from the pack case. [Brief explanation of the drawing] 【0032】 [Figure 1] This shows a conventional cell assembly. [Figure 2] This shows the pack case included in the battery pack of the present invention. [Figure 3] This is a perspective view of a cell assembly included in a battery pack according to the first embodiment of the present invention. [Figure 4] Figure 3 above is a plan view of the cell assembly. [Figure 5] This is a perspective view showing a modified cell assembly. [Figure 6] This is a perspective view showing other variations of the cell assembly. [Figure 7] This is a perspective view showing another modified example of the cell assembly. [Figure 8] This shows a first reinforcing plate attached to one side of a cell assembly included in a battery pack according to the first embodiment of the present invention. [Figure 9] This shows a second reinforcing plate attached to the other side of a cell assembly included in a battery pack according to the first embodiment of the present invention. [Figure 10] This shows a pair of cell assemblies included in a battery pack according to the first embodiment of the present invention. [Figure 11] Figure 10 above shows a pair of reinforcing plates positioned opposite each other on the sides of a pair of adjacent cell assemblies. [Figure 12] This shows an auxiliary partition wall included in a battery pack according to the first embodiment of the present invention. [Figure 13]This shows the auxiliary partition wall of Figure 12 above, which is attached to the pack case. [Figure 14] The above Figure 13 shows the process of inserting the connecting member into the connecting hole of the auxiliary bulkhead. [Figure 15] This figure shows a cell assembly and a pack case included in a battery pack according to the first embodiment of the present invention. [Figure 16] This is a perspective view of a cell assembly included in a battery pack according to the second embodiment of the present invention. [Figure 17] Figure 16 above is a plan view of the cell assembly. [Figure 18] This shows a pair of reinforcing plates included in the battery pack according to the second embodiment, arranged adjacent to each other. [Figure 19] This shows an auxiliary partition wall included in a battery pack according to a second embodiment of the present invention. [Figure 10] This shows a pair of reinforcing plates included in a battery pack according to the third embodiment of the present invention. [Figure 21] This shows a pair of reinforcing plates included in a battery pack according to the fourth embodiment of the present invention. [Figure 22] This shows a pair of reinforcing plates included in a battery pack according to the fifth embodiment of the present invention. [Figure 23] This shows a pair of reinforcing plates included in a battery pack according to the sixth embodiment of the present invention. [Modes for carrying out the invention] 【0033】 Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Before that, however, the terms and words used herein and in the claims should not be interpreted to be limited to their ordinary or dictionary meanings, but rather to be interpreted as meanings and concepts consistent with the technical idea of ​​the present invention, based on the principle that an inventor may appropriately define the concepts of terms in order to best describe his own invention. 【0034】 Therefore, the embodiments described herein and the configurations shown in the drawings represent only one of the most preferred embodiments of the present invention and do not represent the entire technical concept of the present invention; there are various equivalents and modifications that can substitute for them at the time of filing. 【0035】 Furthermore, in describing the present invention, if it is determined that a specific description of a related known configuration or function would likely obscure the gist of the invention, such detailed description will be omitted. 【0036】 Since embodiments of the present invention are provided to more fully explain the invention to an ordinary person, the shapes and sizes of components in the drawings may be exaggerated, omitted, or shown schematically for the sake of clarity. Accordingly, the sizes and proportions of each component do not fully reflect the actual sizes and proportions. 【0037】 The present invention relates to a battery pack that houses a cell assembly 100. 【0038】 The battery pack of the present invention includes a cell assembly 100 including a cell block 110 containing a plurality of cells, and a pack case 200 including a housing A in which the cell assembly 100 is housed. 【0039】 The above-mentioned cells can be classified into cylindrical cells, prismatic cells, and pouch-type cells, depending on the form of the electrode assembly and battery case. 【0040】 The cylindrical cell described above has an electrode assembly wound into a roll, which is inserted into a cylindrical battery case. 【0041】 The above-mentioned rectangular cell can take the form of a stack in which the electrode assembly is stacked with electrodes and separation membranes alternately layered, or it can take the form of a stack-fold configuration in which electrodes and the like are provided on a sheet-like separation membrane folded at regular intervals. 【0042】 The above-mentioned rectangular cell has its electrode assembly inserted into a square, box-shaped battery case. 【0043】 The above pouch-type cell may have an electrode assembly in a stacked configuration or a stack-fold configuration. 【0044】 In the pouch-type cell described above, the electrode assembly is inserted into a pouch-shaped battery case. Therefore, the cell block may include one of the following cells: a cylindrical cell, a prismatic cell, or a pouch-type cell. 【0045】 The cell assembly 100 consists of a cell block 110 and end plates 120 connected to the front and rear of the cell block 110, respectively, and includes reinforcing plates 130 connected to both sides. 【0046】 According to some embodiments, the end plate 120 may further include terminals that are electrically connected to the cell block 110. Each cell assembly 100 can be connected via these terminals. 【0047】 According to some embodiments, the cell assembly 100 may further include a modular frame surrounding the cell block 110 so that each cell can be protected from external impacts. In this case, the modular frame may be provided to support or protect only a portion of the cell block 110, or it may be provided over all exposed portions of the cell block 110 to completely isolate the cell block 110 from the outside. 【0048】 According to some embodiments, the module frame may further include terminals that are electrically connected to the cell block 110. Each cell assembly 100 can be connected via these terminals. 【0049】 The battery pack of the present invention may further include an upper cover that is coupled to the pack case 200 so as to cover the top of each cell assembly 100 housed in the pack case 200. 【0050】 Since the above-mentioned upper cover is based on prior art, a detailed explanation thereof will be omitted in this invention. 【0051】 Figure 2 shows a pack case 200 included in the battery pack of the present invention. The pack case 200 includes a base plate 210 as shown in Figure 2. 【0052】 The base plate 210 described above corresponds to the bottom of the pack case 200 and serves to support the lower part of the cell assembly 100 which is attached to the top. 【0053】 The base plate 210 may have a bottom groove 210a formed therein so that a connecting member B can be inserted and screw-connected. 【0054】 According to some embodiments, the pack case 200 may include a side wall 230. 【0055】 The side wall 230 is perpendicularly connected along the edge of the base plate 210 and serves to surround and protect the outer surface of the cell assembly 100 located on the base plate 210. 【0056】 The pack case 200 described above includes a storage section A in which the cell assembly is housed. 【0057】 The cell assembly 100 is secured to the housing section A. 【0058】 According to some embodiments, the storage section A may become the inner space of the pack case 200 surrounded by the side wall 230. 【0059】 According to some embodiments, the pack case 200 may include a main partition wall 220. 【0060】 The main partition wall 220 is formed to extend across the base plate 210 and is perpendicularly connected to the center of the base plate 210. The main partition wall 220 serves to divide the internal space of the pack case 200 into two large areas, and also serves to protect various conductors used inside the pack case 200 by inserting them into the wall. 【0061】 According to some embodiments, the housing section A may be formed by being partitioned by the main partition wall 220 and the side walls 230. In this case, the pack case 200 includes a pair of housing sections A on both sides of the main partition wall 220, and a plurality of cell assemblies 100 may be arranged and secured in either one of the housing sections A along the longitudinal direction d3 of the main partition wall. 【0062】 The cell assemblies 100, which are attached to both sides of the main bulkhead 220, can be arranged so as to be symmetrical with respect to the main bulkhead 220. 【0063】 Figures 3 to 15 relate to a battery pack according to the first embodiment of the present invention, Figures 16 to 19 relate to a battery pack according to the second embodiment of the present invention, and Figures 20 to 23 relate to battery packs according to the third to sixth embodiments of the present invention, respectively. Hereinafter, the battery packs of the present invention will be described for each embodiment with reference to the drawings. 【0064】 For reference, the relative directions such as front / back, up / down / left / right used in the following explanation are for the purpose of aiding understanding the invention, and unless otherwise specified, the directions shown in the drawings are used as the reference. 【0065】 Furthermore, the longitudinal direction of a configuration is defined as the direction corresponding to the longest plane of that configuration shown in the drawing, relative to the horizontal direction, and the width direction of a configuration is defined as the direction perpendicular to the longitudinal direction, relative to the horizontal direction. 【0066】 (First Embodiment) Figure 3 is a perspective view of a cell assembly 100 included in a battery pack according to the first embodiment of the present invention, Figure 4 is a plan view of the cell assembly 100 in Figure 3, and Figures 5 to 7 are perspective views showing modified examples of the cell assembly 100. 【0067】 Figures 3 and 4 are perspective and plan views, respectively, of a cell assembly 100 including pouch-type cells. 【0068】 The cell assembly 100, as shown in Figure 3, includes a cell block 110 in which a plurality of cells are stacked, and includes end plates 120 that are connected to the front and rear of the cell block 110, respectively. In this case, the end plates 120 may further include terminals that can be electrically connected to the cell block 110. 【0069】 The cell assembly 100 includes a pair of reinforcing plates 130 that are joined on both sides to support the sides of the cell block 110. 【0070】 The reinforcing plate 130 can be connected to the end plate 120. In this case, the reinforcing plate 130 can be connected to the side surface of the end plate 120 by screws or the like, or it can be fixed to the end plate 120 by adhesive. 【0071】 The battery pack of the present invention is characterized in that a pair of cell assemblies 100 housed adjacent to each other in the pack case 200 are connected such that reinforcing plates 130, each containing a cell assembly 100 on one side, are joined together to form a single auxiliary partition wall 240. 【0072】 The reinforcing plate 130 forms a step and includes a protruding portion 131 that extends from the outer surface. 【0073】 As shown in Figure 3, the protruding portion 131 extends from one side of the reinforcing plate 130 to form a step along the height direction d2 of the cell assembly and extends along the longitudinal direction d1 of the cell assembly. The protruding portion 131 includes a connecting hole 131a drilled vertically so that the connecting member B can pass through it, and has a hollow structure with the remaining portion excluding the connecting hole 131a being empty. 【0074】 The above-mentioned connecting member B may be, for example, a bolt with threads formed on its outer surface. 【0075】 The length of the connecting member B is preferably longer than the height of the reinforcing plate 130. 【0076】 As shown in Figure 3 above, the bonding holes 131a can be formed in multiple locations along the longitudinal direction d1 of the cell assembly. 【0077】 As shown in Figure 4, the reinforcing plate 130 consists of a first reinforcing plate 130a connected to one side of the cell block 110 and a second reinforcing plate 130b connected to the other side of the cell block 110. 【0078】 In other words, one cell assembly 100 is provided with a first reinforcing plate 130a and a second reinforcing plate 130b on both sides. 【0079】 The first reinforcing plate 130a and the second reinforcing plate 130b have a difference in the position of the protruding portion 131. 【0080】 The cell assembly 100 described above may include cells of various forms in addition to pouch-type cells. 【0081】 Figure 5 is a perspective view showing a cell assembly 100 that includes cylindrical cells. 【0082】 As shown in Figure 5, the cell assembly 100 includes a cell block 110 in which a plurality of cylindrical cells are arranged, and includes end plates 120 which are connected to the front and rear of the cell block 110, respectively. 【0083】 The cell assembly 100 includes a pair of reinforcing plates 130 that are joined on both sides to support the sides of the cell block 110. 【0084】 The end plate 120 described above does not need to be limited to the shape shown in Figure 5; any shape that can support the front and rear of the cell block 110 is sufficient. 【0085】 The reinforcing plate 130 can be connected to the end plate 120. In this case, the reinforcing plate 130 can be screw-connected to the side surface of the end plate 120 by a separate screw or the like, or it can be fixed to the end plate 120 by an adhesive. 【0086】 Figure 6 is a perspective view showing a cell assembly 100 that includes rectangular cells. 【0087】 As shown in Figure 6, the cell assembly 100 includes a cell block 110 in which a plurality of rectangular cells are arranged, and includes end plates 120 which are connected to the front and rear of the cell block 110, respectively. 【0088】 The cell assembly 100 includes a pair of reinforcing plates 130 that are joined on both sides to support the sides of the cell block 110. 【0089】 At this time, each rectangular cell is arranged so that its longitudinal direction is horizontal to the longitudinal direction of the end plate. 【0090】 The end plate 120 described above does not need to be limited to the shape shown in Figure 5; any shape that can support the front and rear of the cell block 110 is sufficient. 【0091】 The reinforcing plate 130 can be connected to the end plate 120. In this case, the reinforcing plate 130 can be screw-connected to the side surface of the end plate 120 by a separate screw or the like, or it can be fixed to the end plate 120 by an adhesive. 【0092】 Figure 7 is a perspective view showing another form of cell assembly 100 that includes rectangular cells. 【0093】 As shown in Figure 7, the cell assembly 100 includes a cell block 110 in which a plurality of rectangular cells are arranged, and includes end plates 120 which are connected to the front and rear of the cell block 110, respectively. 【0094】 The cell assembly 100 includes a pair of reinforcing plates 130 that are joined on both sides to support the sides of the cell block 110. 【0095】 At this time, each rectangular cell is arranged so that its longitudinal direction is horizontal to the longitudinal direction of the reinforcing plate 130. 【0096】 The end plate 120 described above does not need to be limited to the shape shown in Figure 7; any shape that can support the front and rear of the cell block 110 is sufficient. 【0097】 The reinforcing plate 130 can be connected to the end plate 120. In this case, the reinforcing plate 130 can be screw-connected to the side surface of the end plate 120 by a separate screw or the like, or it can be fixed to the end plate 120 by an adhesive. 【0098】 A pair of reinforcing plates 130 included in one cell assembly 100 have a shape in which the protrusions 131 interlock with each other. That is, one of the reinforcing plates 130 has the protrusion 131 formed on the upper part, and the other reinforcing plate 130 has the protrusion 131 formed on the lower part. 【0099】 Figure 8 shows the first reinforcing plate 130a attached to one side of the cell assembly 100. Referring to Figure 8, the first reinforcing plate 130a has the protruding portion 131 formed at the lower part of the reinforcing plate 130 and extends along the longitudinal direction d1 of the cell assembly. 【0100】 The above-mentioned protrusion 131 protrudes so as to form a step on one side of the reinforcing plate 130, and the first reinforcing plate 130a includes an upper stepped portion 133a formed by the upper corner of the protrusion 131 formed at its lower part. The upper stepped portion 133a is formed by extending along the protrusion 131 in the longitudinal direction d1 of the cell assembly. 【0101】 The first reinforcing plate 130a includes a connecting hole 131a that penetrates the protruding portion 131 vertically. Specifically, the connecting hole 131a is formed on the upper stepped portion 133a. 【0102】 In some embodiments, a plurality of bonding holes 131a are formed at predetermined intervals along the longitudinal direction of the cell assembly 100. 【0103】 Figure 9 shows the second reinforcing plate 130b connected to the other side of the cell assembly 100. Referring to Figure 9, the second reinforcing plate 130b has the protruding portion 131 formed on the upper part of the reinforcing plate 130 and extends along the longitudinal direction d1 of the cell assembly. 【0104】 The second reinforcing plate 130b includes a lower stepped portion 133b formed by the lower corner of the protrusion 131 formed at its upper part. The lower stepped portion 133b is formed by extending along the protrusion 131 in the longitudinal direction d1 of the cell assembly. 【0105】 When a pair of cell assemblies 100 are joined by the reinforcing plate 130, the first reinforcing plate 130a included on one side of either cell assembly 100 is joined to the second reinforcing plate 130b included in the other cell assembly 100. 【0106】 The protruding portion 131 of the second reinforcing plate 130b has a plurality of connecting holes 131a formed at predetermined intervals, preferably at positions corresponding to the positions of the connecting holes 131a formed in the protruding portion 131 of the first reinforcing plate 130a, with reference to the longitudinal direction d1 of the cell assembly. 【0107】 Figure 10 shows the joining process of a pair of adjacent cell assemblies 100. 【0108】 At this time, a pair of reinforcing plates 130 formed on one side of each cell assembly 100 so as to face each other are joined so that their protrusions 131 overlap each other alternately. Specifically, the first reinforcing plate 130a of one cell assembly 100 is joined to the second reinforcing plate 130b of the other adjacent cell assembly 100, and at this time, the protrusions 131 formed on the lower part of the first reinforcing plate 130a and the protrusions 131 formed on the upper part of the second reinforcing plate 130b are joined so as to interlock with each other to form one auxiliary partition wall 240. 【0109】 Figure 11 shows a pair of reinforcing plates 130 positioned opposite each other on the sides of a pair of cell assemblies 100 that are adjacent to each other in Figure 10. 【0110】 Referring to Figure 11 above, the protrusions 131 included in the first reinforcing plate 130a and the second reinforcing plate 130b have interlocking shapes. Specifically, one side of the first reinforcing plate 130a facing the protrusion 131 formed on the upper part of the second reinforcing plate 130b is formed to correspond to the shape of the protrusion 131 of the second reinforcing plate 130b, and one side of the second reinforcing plate 130b facing the protrusion 131 formed on the lower part of the first reinforcing plate 130a is formed to correspond to the shape of the protrusion 131 of the first reinforcing plate 130a. The first reinforcing plate 130a and the second reinforcing plate 130b can be joined together so that no gaps are created between them due to their corresponding shapes. At this time, the lower stepped portion 133b of the second reinforcing plate 130b comes into contact with the upper stepped portion 133a of the first reinforcing plate 130a as a result of this joining. 【0111】 Furthermore, as a result of the above connection, each connection hole 131a contained in the first reinforcing plate 130a coincides with each connection hole 131a contained in the second reinforcing plate 130b. 【0112】 Figure 12 shows the auxiliary bulkhead 240 to which the first reinforcing plate 130a and the second reinforcing plate 130b are joined. 【0113】 As shown in Figure 12, the auxiliary partition wall 240 of the present invention has a first reinforcing plate 130a and a second reinforcing plate 130b joined together without any gaps, and the positions of the respective joining holes 131a coincide with each other so that each joining hole 131a of the first reinforcing plate 130a communicates with each joining hole 131a of the second reinforcing plate 130b. 【0114】 According to some embodiments, the auxiliary partition wall 240 may include a connecting portion 132 protruding from either end with respect to the longitudinal direction d1 of the cell assembly. Specifically, of the pair of reinforcing plates 130 forming the auxiliary partition wall 240, the second reinforcing plate 130b, which has a protruding portion 131 formed on its upper part, includes a connecting portion 132 protruding from either the front end or the rear end. 【0115】 The second reinforcing plate 130b may further include an auxiliary connecting hole 132a drilled through the connecting portion 132 in a vertical direction. 【0116】 According to some embodiments, the auxiliary partition wall 240 may include a screw groove 240a formed so that a screw can be inserted horizontally into either end of the cell assembly with respect to the longitudinal direction d1 of the cell assembly to allow connection. Specifically, the screw groove 240a is included in the end of the first reinforcing plate 130a. 【0117】 The auxiliary partition wall 240 included in the battery pack of the present invention can be coupled to at least one of the main partition wall 220, side wall 230, and base plate 210 of the pack case 200. 【0118】 Figure 13 shows a portion of the auxiliary partition wall 240 shown in Figure 12, which is connected to the pack case 200. (For ease of understanding, although not shown in the drawing, cell blocks 110 and the like are connected to both sides of the auxiliary partition wall 240.) 【0119】 Referring to Figure 13 above, the main bulkhead 220 includes a coupling groove 220a on one side where the auxiliary bulkhead 240 is located, into which the coupling portion 132 of the auxiliary bulkhead 240 can be inserted. 【0120】 The auxiliary partition wall 240 is installed on the base plate 210 of the pack case 200 such that the connecting portion 132 is inserted into the connecting groove 220a. 【0121】 According to some embodiments, the main partition wall 220 may include an auxiliary coupling groove 220a formed at the bottom of the coupling groove 220a corresponding to the position of the auxiliary coupling hole 132a of the inserted coupling portion 132. 【0122】 The auxiliary bulkhead 240 can be connected to and fixed to the main bulkhead 220 by a screw that passes through the auxiliary coupling hole 132a and is inserted into the auxiliary coupling groove 220a. 【0123】 According to some embodiments, the side wall 230 may include a screw hole 230a drilled so that a connecting member B can pass through horizontally at a position corresponding to the connecting groove 220a of the main partition wall 220. 【0124】 In this case, the auxiliary partition wall 240 is installed such that the screw groove 240a included at its end corresponds to the position of the screw hole 230a. 【0125】 The auxiliary partition wall 240 can be joined and fixed to the side wall 230 by a screw that passes through the screw hole 230a and is inserted into the screw groove 240a. 【0126】 The cell assembly 100 of the present invention is characterized in that it is connected to the pack case 200 by a connecting member B that penetrates the auxiliary partition wall 240 vertically and is screw-connected to the bottom of the pack case 200, and its sides are supported by the connecting member B that penetrates the auxiliary partition wall 240. 【0127】 Figure 14 shows the process of inserting the connecting member B into the connecting hole 131a of the auxiliary partition wall 240 shown in Figure 13. 【0128】 Referring to Figures 12 and 14 above, the base plate 210 of the pack case 200 includes a bottom groove 210a that corresponds to the position of the coupling hole 131a of the auxiliary partition wall 240 and is formed so that the coupling member B can be inserted and coupled to it. 【0129】 The auxiliary partition wall 240 is connected to the base plate 210 by a connecting member B that penetrates the connecting hole 131a of the first reinforcing plate 130a and the second reinforcing plate 130b and is inserted into the bottom groove 210a. 【0130】 The connecting member B inserted into the connecting hole 131a of the auxiliary partition wall 240 preferably has a length longer than the height of the auxiliary partition wall 240 so that it can penetrate the connecting hole 131a and be inserted into the bottom groove 210a of the base plate 210. 【0131】 Figure 15 shows a pack case 200 in which a cell assembly 100 is housed in a housing section A. The cell assembly 100 installed in the housing section A is fixed to the pack case 200 by the auxiliary partition wall 240 and the connecting member B that penetrates the auxiliary partition wall 240. 【0132】 In the battery pack of the present invention, even if any one of the contained cell assemblies 100 is swollen, the deformation of the cell assembly 100 can be temporarily suppressed by the auxiliary partition wall 240 formed by the joining of the two reinforcing plates 130. Furthermore, the deformation of the cell assembly 100 can be secondarily suppressed via a plurality of connecting members B that penetrate vertically through the auxiliary partition wall 240 and are connected to the base plate 210. 【0133】 (Second Embodiment) The cell assembly 100 included in the battery pack according to the second embodiment of the present invention differs from the cell assembly 100 of the battery pack according to the first embodiment in that the protruding portion 131 of the reinforcing plate 130 does not have a hollow structure. 【0134】 Therefore, the auxiliary bulkhead 240 included in the battery pack of the second embodiment described above has the characteristic of having further improved strength. 【0135】 Figure 16 is a perspective view of a cell assembly 100 included in a battery pack according to the second embodiment, and Figure 17 is a plan view of the cell assembly 100 shown in Figure 16. 【0136】 The cell assembly 100, as shown in Figures 16 and 17, includes a cell block 110 in which a plurality of cells are stacked, and includes end plates 120 that are connected to the front and rear of the cell block 110, respectively. 【0137】 The cell assembly 100 includes a pair of reinforcing plates 130 that are joined on both sides to support the sides of the cell block 110. 【0138】 The reinforcing plate 130 can be connected to the end plate 120. In this case, the reinforcing plate 130 can be connected to the side surface of the end plate 120 by screws or the like, or it can be fixed to the end plate 120 by adhesive. 【0139】 In the present invention, the battery pack is constructed such that a pair of cell assemblies 100 housed adjacent to the pack case 200 are joined together, with reinforcing plates 130 containing each cell assembly on one side, to form a single auxiliary partition wall 240. 【0140】 The reinforcing plate 130 described above forms a step and includes a protruding portion 131. 【0141】 As shown in Figure 16, the above-mentioned protrusion 131 protrudes on one side of the reinforcing plate 130 so as to form a step along the height direction d2 of the cell assembly, and is extended along the longitudinal direction d1 of the cell assembly. 【0142】 As shown in Figure 16 above, the bonding holes 131a can be formed in multiple locations along the longitudinal direction d1 of the cell assembly. 【0143】 As shown in Figure 17, the reinforcing plate 130 consists of a first reinforcing plate 130a connected to one side of the cell assembly 100 and a second reinforcing plate 130b connected to the other side. 【0144】 The first reinforcing plate 130a and the second reinforcing plate 130b have a difference in the position of the protruding portion 131. 【0145】 The first reinforcing plate 130a has the protruding portion 131 formed at the lower part of the reinforcing plate 130 and extends along the longitudinal direction d1 of the cell assembly. 【0146】 The above-mentioned protrusion 131 protrudes so as to form a step on one side of the reinforcing plate 130, and the first reinforcing plate 130a includes an upper stepped portion 133a formed by the upper corner of the protrusion 131 formed at its lower part. The upper stepped portion 133a is formed by extending along the protrusion 131 in the longitudinal direction d1 of the cell assembly. 【0147】 The protruding portion 131 of the first reinforcing plate 130a is formed by a plurality of connecting holes 131a spaced apart at predetermined intervals. 【0148】 The second reinforcing plate 130b has the protruding portion 131 formed on the upper part of the reinforcing plate 130 and extends along the longitudinal direction d1 of the cell assembly. 【0149】 The second reinforcing plate 130b includes a lower stepped portion 133b formed by the lower corner of the protrusion 131 formed at its upper part. The lower stepped portion 133b is formed by extending along the protrusion 131 in the longitudinal direction d1 of the cell assembly. 【0150】 When a pair of cell assemblies 100 are joined by the reinforcing plate 130, the first reinforcing plate 130a included on one side of either cell assembly 100 is joined to the second reinforcing plate 130b included on one side of the other cell assembly 100. 【0151】 The protruding portion 131 of the second reinforcing plate 130b has a plurality of connecting holes 131a formed at predetermined intervals, preferably at the same positions as the connecting holes 131a formed on the protruding portion 131 of the first reinforcing plate 130a, with reference to the longitudinal direction d1 of the cell assembly. 【0152】 In each of the cell assemblies 100 that are joined together, a pair of reinforcing plates 130 formed on one side of each cell assembly 100 so as to face each other are joined so that their protrusions 131 interlock with each other. Specifically, the first reinforcing plate 130a of one cell assembly 100 is joined to the second reinforcing plate 130b of the other adjacent cell assembly 100, at which point the protrusions 131 formed on the lower part of the first reinforcing plate 130a and the protrusions 131 formed on the upper part of the second reinforcing plate 130b are positioned to interlock with each other and joined together to form a single auxiliary partition wall 240. 【0153】 Figure 18 shows a pair of reinforcing plates 130 positioned opposite each other on the sides of a pair of adjacent cell assemblies 100. 【0154】 Referring to Figure 18 above, the first reinforcing plate 130a and the second reinforcing plate 130b are formed to correspond to the shape of the protrusions 131 formed on each. Specifically, one side of the first reinforcing plate 130a facing the protrusion 131 formed on the upper part of the second reinforcing plate 130b is formed to correspond to the shape of the protrusion 131 of the second reinforcing plate 130b, and one side of the second reinforcing plate 130b facing the protrusion 131 formed on the lower part of the first reinforcing plate 130a is formed to correspond to the shape of the protrusion 131 of the first reinforcing plate 130a. 【0155】 The first reinforcing plate 130a and the second reinforcing plate 130b can be joined together by corresponding shapes so that no gaps are created between them. In this case, the lower stepped portion 133b of the second reinforcing plate 130b comes into contact with the upper stepped portion 133a of the first reinforcing plate 130a. 【0156】 Furthermore, as a result of the above connection, each connection hole 131a contained in the first reinforcing plate 130a coincides with each connection hole 131a contained in the second reinforcing plate 130b. 【0157】 Figure 19 shows the auxiliary bulkhead 240 to which the first reinforcing plate 130a and the second reinforcing plate 130b are joined. 【0158】 As shown in Figure 19, the auxiliary partition wall 240 of the present invention has a first reinforcing plate 130a and a second reinforcing plate 130b joined together without any gaps. 【0159】 The positions of the respective connecting holes 131a coincide with each other so that each connecting hole 131a of the first reinforcing plate 130a communicates with each connecting hole 131a of the second reinforcing plate 130b. 【0160】 The auxiliary partition wall 240 included in the battery pack according to the second embodiment shown in Figure 19 above is connected to and fixed to the pack case 200 in the same manner as the auxiliary partition wall 240 included in the battery pack according to the first embodiment. 【0161】 (Third embodiment) The cell assembly 100 included in the battery pack according to the third embodiment of the present invention includes a horizontal insertion bar 134b protruding horizontally from the reinforcing plate 130 and a horizontal insertion hole 135b formed horizontally on its outer surface. 【0162】 Figure 20 shows a pair of reinforcing plates 130 included in the battery pack according to the third embodiment. 【0163】 The horizontal insertion bar 134b and horizontal insertion hole 135b are formed on the outer surfaces of the reinforcing plates 130, which are provided on both sides of the cell assembly 100, as shown in Figure 20. 【0164】 The horizontal insertion bar 134b is formed in each reinforcing plate 130 at a position where no protrusions 131 are formed. 【0165】 The horizontal insertion bar 134b is formed at a predetermined distance from the protruding portion 131 at either the upper or lower position of the protruding portion 131. 【0166】 Specifically, when the protruding portion 131 of the reinforcing plate 130 is formed at the upper part, the horizontal insertion bar 134b is formed below the protruding portion 131. Also, when the protruding portion 131 of the reinforcing plate 130 is formed at the lower part, the horizontal insertion bar 134b is formed above the protruding portion 131. 【0167】 The horizontal insertion holes 135b described above are formed in each reinforcing plate 130 at the positions where the protrusions 131 are formed. Specifically, each horizontal insertion hole 135b is formed at a position corresponding to the horizontal insertion bar 134b of the other opposing reinforcing plate 130. 【0168】 In the battery pack according to the third embodiment, each reinforcing plate 130 contains only one of the horizontal insertion bar 134b and the horizontal insertion hole 135b. 【0169】 When a horizontal insertion bar 134b is formed in the first reinforcing plate 130a, the corresponding horizontal insertion hole 135b is formed in the second reinforcing plate 130b. Conversely, when a horizontal insertion bar 134b is formed in the second reinforcing plate 130b, the corresponding horizontal insertion hole 135b is formed in the first reinforcing plate 130a. 【0170】 In other words, in some embodiments, the cell assembly 100 of the present invention includes a horizontal insertion bar 134b on the upper outer surface of the first reinforcing plate 130a and a horizontal insertion hole 135b on the upper outer surface of the second reinforcing plate 130b. 【0171】 In this case, the horizontal insertion hole 135b of the second reinforcing plate 130b is formed to correspond to the horizontal insertion bar 134b of the first reinforcing plate 130a, so that the horizontal insertion bar 134b of the first reinforcing plate 130a can be inserted into it. 【0172】 In another embodiment, the cell assembly 100 of the present invention includes a horizontal insertion hole in the lower part of the outer surface of the first reinforcing plate and a horizontal insertion bar in the lower part of the outer surface of the second reinforcing plate. 【0173】 In this case, the horizontal insertion holes of the first reinforcing plate are formed to correspond to the horizontal insertion bars of the second reinforcing plate, so that the horizontal insertion bars of the second reinforcing plate can be inserted into them. 【0174】 The first reinforcing plate of one of the cell assemblies 110 included in the auxiliary bulkhead 240 is connected to the second reinforcing plate by inserting the horizontal insertion bar into the horizontal insertion hole included in the second reinforcing plate of the other cell assembly. 【0175】 As a result, the pair of cell assemblies 100 can be temporarily joined and fixed by the horizontal insertion bar 134b and the horizontal insertion hole 135b. 【0176】 In the third embodiment of the present invention, the battery pack can also be fixed to the pack case all at once with each cell assembly 100 pre-connected by connecting the horizontal insertion bar 134b and horizontal insertion hole 135b of the reinforcing plate 130. 【0177】 Furthermore, the horizontal insertion bar 134b inserted into the horizontal insertion hole 135b restricts each reinforcing plate 130 from moving or swaying horizontally. Thus, each cell assembly 100, including the reinforcing plate 130, can be secured with a stable fixing force in the horizontal direction by the horizontal insertion bar 134b and the horizontal insertion hole 135b. 【0178】 (Fourth Embodiment) The cell assembly 100 included in the battery pack according to the fourth embodiment of the present invention includes a horizontal insertion bar 134b protruding horizontally from the reinforcing plate 130 and a horizontal insertion hole 135b formed horizontally on its outer surface. 【0179】 Figure 21 shows a pair of reinforcing plates 130 included in the battery pack according to the fourth embodiment. 【0180】 The horizontal insertion bar 134b and horizontal insertion hole 135b are formed on the outer surfaces of the reinforcing plates 130, which are provided on both sides of the cell assembly 100, as shown in Figure 21. 【0181】 A pair of reinforcing plates 130 provided on both sides of the cell assembly 100 each include a protrusion 131 at the top and bottom, respectively. 【0182】 The horizontal insertion bar 134b is formed in each reinforcing plate 130 at a position where no protrusion 131 is formed. Specifically, when the protrusion 131 of the reinforcing plate 130 is formed at the top, the horizontal insertion bar 134b is formed below the protrusion 131. Also, when the protrusion 131 of the reinforcing plate 130 is formed at the bottom, the horizontal insertion bar 134b is formed above the protrusion 131. 【0183】 The horizontal insertion holes 135b described above are formed in each reinforcing plate 130 at the positions where the protrusions 131 are formed. Specifically, each horizontal insertion hole 135b is formed at a position corresponding to the horizontal insertion bar 134b of the other opposing reinforcing plate 130. 【0184】 In the fourth embodiment, the cell assembly included in the battery pack may have each reinforcing plate 130 simultaneously include a horizontal insertion bar 134a and a horizontal insertion hole 135b. 【0185】 Therefore, when a pair of adjacent cell assemblies 100 are joined, the horizontal insertion bar 134b of each reinforcing plate 130 is inserted into the horizontal insertion hole 135b of the other reinforcing plate 130. In this way, the pair of cell assemblies 100 can be temporarily joined and fixed by the horizontal insertion bar 134b and the horizontal insertion hole 135b. 【0186】 In other words, in some embodiments, the cell assembly 100 of the present invention includes a horizontal insertion bar 134b on the upper outer surface of the first reinforcing plate 130a and a horizontal insertion hole 135b on the upper outer surface of the second reinforcing plate 130b. Furthermore, the first reinforcing plate further includes a horizontal insertion hole on the lower outer surface, and the second reinforcing plate further includes a horizontal insertion bar on the lower outer surface. 【0187】 In the fourth embodiment of the present invention, the battery pack can also be fixed to the pack case all at once with each cell assembly 100 pre-connected by connecting the horizontal insertion bar 134b and horizontal insertion hole 135b of the reinforcing plate 130. 【0188】 Furthermore, the horizontal insertion bar 134b inserted into the horizontal insertion hole 135b restricts each reinforcing plate 130 from moving or swaying horizontally. Thus, each cell assembly 100, including the reinforcing plate 130, can be secured with a stable fixing force in the horizontal direction by the horizontal insertion bar 134b and the horizontal insertion hole 135b. 【0189】 (Fifth embodiment) A cell assembly 100 included in a battery pack according to the fifth embodiment of the present invention includes a vertical insertion bar 134a protruding vertically from the reinforcing plate 130 and a vertical insertion hole 135a formed vertically. 【0190】 Figure 22 shows a pair of reinforcing plates 130 included in the battery pack according to the fifth embodiment. 【0191】 The vertical insertion bar 134a and vertical insertion hole 135a are formed in the reinforcing plates 130 provided on both sides of the cell assembly 100, as shown in Figure 22. 【0192】 Of the pair of reinforcing plates 130 provided on both sides of the cell assembly 100, one includes a vertical insertion bar 134a, and the other includes a vertical insertion hole 135a. 【0193】 The vertical insertion bar 134a and the vertical insertion hole 135a are formed in either the upper or lower part of the protrusion 131. Specifically, in the case of a pair of reinforcing plates 130, where the protrusion 131 is formed at the upper part of the reinforcing plate 130, the vertical insertion bar 134a is formed to extend downward at the lower part of the protrusion 131, i.e., at the lower stepped portion 133b. 【0194】 Furthermore, in the case of another reinforcing plate 130 with a protrusion 131 formed at its lower part, the vertical insertion hole 135a is formed at the upper part of the protrusion 131, that is, at the upper stepped portion 133a, in a position corresponding to the vertical insertion bar 134a of the other cell assembly 100. 【0195】 In other words, in some embodiments, the cell assembly 100 of the present invention includes a vertical insertion bar in the upper stepped portion of the first reinforcing plate and a vertical insertion hole in the lower stepped portion of the second reinforcing plate. 【0196】 In this case, the vertical insertion holes of the second reinforcing plate are formed to correspond to the vertical insertion bars of the first reinforcing plate, so that the vertical insertion bars of the first reinforcing plate can be inserted into them. 【0197】 In another embodiment, the cell assembly 100 of the present invention includes a vertical insertion hole in the upper stepped portion of the first reinforcing plate and a vertical insertion bar in the lower stepped portion of the second reinforcing plate. 【0198】 In this case, the vertical insertion holes of the first reinforcing plate are formed to correspond to the vertical insertion bars of the second reinforcing plate, so that the vertical insertion bars of the second reinforcing plate can be inserted into them. 【0199】 The first reinforcing plate of one of the cell assemblies 100 included in the auxiliary bulkhead 240 is connected to the second reinforcing plate by inserting the vertical insertion bar into the vertical insertion hole included in the second reinforcing plate of the other cell assembly 100. 【0200】 As a result, the pair of cell assemblies can be temporarily joined and secured by the vertical insertion bar and vertical insertion hole. 【0201】 However, unlike the battery packs of the third and fourth embodiments, in the fifth embodiment, the pair of cell assemblies 100 are moved vertically and coupled together. 【0202】 In the fifth embodiment of the present invention, the battery pack can also be attached to the pack case all at once with each cell assembly 100 pre-assembled by connecting the vertical insertion bar and vertical insertion hole of the reinforcing plate 130. 【0203】 The vertical insertion bar 134a inserted into the vertical insertion hole 135a restricts each reinforcing plate 130 from moving or swaying vertically. Thus, each cell assembly 100, including the reinforcing plates 130, can be secured with a stable vertical fixing force by the vertical insertion bar 134a and the vertical insertion hole 135a. 【0204】 (Sixth Embodiment) The cell assembly 100 included in the battery pack according to the sixth embodiment of the present invention includes a vertical insertion bar 134a protruding vertically from the reinforcing plate 130 and a vertical insertion hole 135a formed vertically. In particular, it is characterized in that both the vertical insertion bar 134a and the vertical insertion hole 135a are formed in either one of the reinforcing plates 130. 【0205】 Figure 23 shows a pair of reinforcing plates 130 included in the battery pack according to the sixth embodiment. 【0206】 The vertical insertion bar 134a and vertical insertion hole 135a are formed on the outer surfaces of the reinforcing plates 130, which are provided on both sides of the cell assembly 100, as shown in Figure 23. 【0207】 Each reinforcing plate 130 provided on both sides of the cell assembly 100 includes both a vertical insertion bar 134a and a vertical insertion hole 135a. 【0208】 In the case of a pair of reinforcing plates 130, if the protruding portion 131 is formed at the upper part of the reinforcing plate 130, the vertical insertion bar 134a and vertical insertion hole 135a are formed below the protruding portion 131, i.e., at the lower stepped portion 133b. Conversely, in the case of a reinforcing plate 130 where the protruding portion 131 is formed at the lower part, the vertical insertion bar 134a and vertical insertion hole 135a are formed above the protruding portion 131, i.e., at the upper stepped portion 133a. 【0209】 In this case, each vertical insertion bar 134a and vertical insertion hole 135a formed in one of the reinforcing plates 130 corresponds to the position of the vertical insertion hole 135a and vertical insertion bar 134a formed in the other reinforcing plate 130 that is joined to it. 【0210】 Specifically, as shown in Figure 23, the vertical insertion bar 134a and vertical insertion hole 135a formed downwards by the reinforcing plate 130 including a protrusion 131 at the top correspond to the vertical insertion hole 135a and vertical insertion bar 134a formed upwards by the reinforcing plate 130 including a protrusion 131 at the bottom. 【0211】 Therefore, the vertical insertion bars 134a of each reinforcing plate 130 are inserted into the corresponding vertical insertion holes 135a, and the pair of reinforcing plates 130 are joined together. 【0212】 In other words, in some embodiments, the cell assembly 100 of the present invention includes a vertical insertion bar in the upper stepped portion of the first reinforcing plate and a vertical insertion hole in the lower stepped portion of the second reinforcing plate. Furthermore, the first reinforcing plate further includes a vertical insertion hole in the upper stepped portion, and the second reinforcing plate further includes a vertical insertion bar in the lower stepped portion. 【0213】 In the sixth embodiment, the battery pack is connected by a pair of cell assemblies 100 moving vertically, similar to the battery pack of the fifth embodiment. 【0214】 The vertical insertion bar 134a inserted into the vertical insertion hole 135a restricts each reinforcing plate 130 from moving or swaying vertically. Thus, each cell assembly 100, including the reinforcing plates 130, can be secured with a stable vertical fixing force by the vertical insertion bar 134a and the vertical insertion hole 135a. 【0215】 The present invention has been described in more detail above through the drawings and embodiments. However, the configurations described in the drawings or embodiments described herein are merely one embodiment of the present invention and do not represent the entire technical concept of the present invention. Therefore, there may be various equivalents and modifications that can substitute for them at the time of filing. [Explanation of Symbols] 【0216】 10: (Conventional Technology) Cell Assembly 11: (Conventional technology) Cell block 12: (Conventional Technology) End Plate 100: Cell assembly 110: Cell Block 120: End plate 130: Reinforcement plate 130a: First reinforcing plate 130b: Second reinforcement plate 131:Protrusion 131a: Bonding hole 132:Joining part 132a: Auxiliary bonding hole 133: Stepped section 133a: Upper step section 133b: Lower step section 134a: Vertical insertion bar 134b: Horizontal insertion bar 135a: Vertical insertion hole 135b: Horizontal insertion hole 200: Pack Case 210: Base plate 210a:Bottom groove 220: Main bulkhead 220a: Binding groove 230: Side wall 230a: Screw hole 240: Auxiliary bulkhead 240a: Screw groove A: Storage area B: Connecting member d1: Longitudinal direction of the cell assembly d2: Height direction of the cell assembly d3: Longitudinal direction of the main bulkhead

Claims

[Claim 1] Cell assembly, and Pack case including a housing section in which the aforementioned cell assembly is housed Includes, The aforementioned cell assembly is Cell blocks containing multiple cells, and A pair of reinforcing plates, each having a protrusion on its outer surface, are attached to both sides of the cell block so as to support both sides of the cell block. Includes, The aforementioned reinforcing plate is A first reinforcing plate, which is coupled to one side of the cell block, and A second reinforcing plate is connected to the other side of the aforementioned cell block. Includes, The outer surfaces of the first reinforcing plate and the outer surfaces of the second reinforcing plate have a shape that interlocks with each other. The first reinforcing plate includes the protrusion on the lower part of its outer surface, and the upper stepped portion above the protrusion, The second reinforcing plate includes the protruding portion on the upper part of its outer surface, and the lower stepped portion below the protruding portion. At least one of the first reinforcing plate and the second reinforcing plate includes either a horizontal insertion bar protruding horizontally from its outer surface or a horizontal insertion hole formed horizontally. At least the other of the first reinforcing plate and the second reinforcing plate includes the other of the horizontal insertion bar and the horizontal insertion hole on its outer surface. The horizontal insertion hole is formed in accordance with the horizontal insertion bar so that the horizontal insertion bar can be inserted in the direction in which the horizontal insertion bar protrudes. Any pair of cell assemblies housed adjacent to the aforementioned housing are connected such that the first reinforcing plate and the second reinforcing plate are joined together to form a single auxiliary partition wall. The auxiliary partition is connected to the pack case by a connecting member that penetrates the auxiliary partition and is connected to the bottom of the pack case. The aforementioned protrusion includes a connecting hole drilled vertically so that the connecting member can pass through it. The battery pack is provided with coupling holes in the first reinforcing plate and the second reinforcing plate, respectively, which are included in the auxiliary bulkhead, at positions corresponding to each other. [Claim 2] The first reinforcing plate includes a horizontal insertion bar on the upper part of the outer surface, The second reinforcing plate includes a horizontal insertion hole in the upper part of its outer surface, The battery pack according to claim 1, wherein the horizontal insertion hole of the second reinforcing plate is formed corresponding to the horizontal insertion bar of the first reinforcing plate so that the horizontal insertion bar of the first reinforcing plate can be inserted into it. [Claim 3] The first reinforcing plate further includes a horizontal insertion hole in the lower part of the outer surface, The second reinforcing plate further includes a horizontal insertion bar at the lower part of the outer surface, The battery pack according to claim 2, wherein the horizontal insertion hole of the first reinforcing plate is formed corresponding to the horizontal insertion bar of the second reinforcing plate so that the horizontal insertion bar of the second reinforcing plate can be inserted into it. [Claim 4] The first reinforcing plate includes a horizontal insertion hole in the lower part of its outer surface, The second reinforcing plate includes a horizontal insertion bar at the lower part of the outer surface, The battery pack according to claim 1, wherein the horizontal insertion hole of the first reinforcing plate is formed corresponding to the horizontal insertion bar of the second reinforcing plate so that the horizontal insertion bar of the second reinforcing plate can be inserted into it. [Claim 5] The battery pack according to claim 1, wherein the protruding portion is formed to extend along the longitudinal direction of the cell assembly. [Claim 6] The battery pack according to claim 1, wherein the protruding portion has a hollow structure. [Claim 7] The pack case includes a base plate that supports the lower part of the cell assembly, The base plate includes a bottom groove formed to allow insertion of the connecting member, corresponding to the position of the connecting hole included in the auxiliary partition wall. The battery pack according to claim 1, wherein the auxiliary partition wall is connected to the base plate by the connecting member that penetrates the connecting hole and is inserted into the bottom groove. [Claim 8] The first reinforcing plate includes a horizontal insertion bar on the upper part of the outer surface, The second reinforcing plate includes a horizontal insertion hole in the upper part of its outer surface, The battery pack according to claim 1, wherein the first reinforcing plate of any one cell assembly included in the auxiliary bulkhead is coupled with the second reinforcing plate by inserting the horizontal insertion bar into the horizontal insertion hole included in the second reinforcing plate of the other cell assembly.

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