Battery pack

Abstract

The present disclosure relates to a battery pack capable of allowing smooth assembly and improving the lifetime of battery cells. To this end, the battery pack of the present disclosure includes a housing, a cell stack disposed within the housing and including a plurality of battery cells arranged in a first direction, and an end plate disposed between the housing and the cell stack, the end plate including: a first plate configured to be in contact with the housing; a second plate disposed to face the first plate and configured to be in contact with or separated from the cell stack while moving in a direction parallel to the first direction; a chamber disposed between the first plate and the second plate; and a spacer disposed within the chamber such that the second plate contacts the cell stack. According to the present disclosure, the cell stack is directly assembled within the housing without a separate structure, such as an existing side plate, thereby improving the overall energy density.

Description

Technical Field

[0001] Aspects of embodiments of the present disclosure relate to a battery pack. Background Art

[0002] Unlike primary batteries that cannot be charged, secondary batteries are batteries that can be charged and discharged. Low-capacity secondary batteries are used in small portable electronic devices such as smartphones, feature phones, laptop computers, digital cameras, and camcorders, and high-capacity secondary batteries are widely used as power sources for motors driving hybrid vehicles, electric vehicles, etc., and as batteries for power storage. A secondary battery includes an electrode assembly having a positive electrode and a negative electrode, a case accommodating the positive electrode and the negative electrode, electrode terminals connected to the electrode assembly, and the like.

[0003] Secondary batteries can be used as a battery pack formed of a plurality of unit battery cells connected in series and / or in parallel to provide a high energy density. The battery pack can be formed by connecting the electrode terminals of a plurality of unit batteries to each other to meet the required power and, for example, to implement a high-power secondary battery for an electric vehicle.

[0004] The above information disclosed in the technology forming the background of the present disclosure is only intended to enhance the understanding of the background of the present disclosure and may therefore include information that does not constitute related art. Summary of the Utility Model

[0005] Aspects of embodiments of the present disclosure aim to provide a battery pack and a method of manufacturing the same that can allow for smooth assembly and improve the lifespan of battery cells.

[0006] These and other aspects and features of the present disclosure will be described in the following description of some embodiments of the present disclosure or will be apparent from the following description.

[0007] According to one or more embodiments, a battery pack includes: a housing; a cell stack disposed within the housing and including a plurality of battery cells arranged in a first direction; and an end plate disposed between the housing and the cell stack, wherein the end plate includes: a first plate configured to contact the housing; a second plate disposed to face the first plate and configured to contact or separate from the cell stack while moving in a direction parallel to the first direction; a chamber disposed between the first plate and the second plate; and a spacer disposed within the chamber such that the second plate contacts the cell stack.

[0008] The spacer may be provided to be elastically deformable.

[0009] The spacer may be hardened after being injected into the chamber in a liquid state.

[0010] The end plate may further include a first sealing member disposed between the first plate and the second plate and configured to seal the chamber.

[0011] The first sealing member may include: a first sealing body configured to surround the chamber and having two ends in close contact with the first plate and the second plate respectively; and a support member fixed to at least one of the first plate and the second plate and configured to support the first sealing body.

[0012] The first sealing body may expand and contract in a direction parallel to the first direction depending on the relative movement of the first plate and the second plate.

[0013] The first sealing body may be provided as elastically deformable.

[0014] One side of the chamber may pass through the first sealing body and be connected to the external space of the first plate and the second plate.

[0015] The first sealing member may further include a plurality of sealing ribs protruding from the end portion of the first sealing body.

[0016] The end plate may further include: a jig hole formed through the first plate; and a second sealing member spaced apart from the first sealing member and configured to seal the jig hole.

[0017] The second sealing member may include: a second sealing body configured to face the jig hole and having two ends in close contact with the first plate and the second plate respectively; and a guide hole formed through the second sealing body and configured to be connected to the jig hole.

[0018] The area of the guide hole may be larger than the area of the jig hole.

[0019] The battery pack may further include a reinforcing member disposed between the first plate and the second plate and coupled to the spacer.

[0020] A plurality of reinforcing members may be provided, and the plurality of reinforcing members may protrude from at least one of the first plate and the second plate toward the spacer.

[0021] The reinforcing member may include: a first reinforcing bar; and a second reinforcing bar connected to the first reinforcing bar, and the cross-sectional area of the second reinforcing bar may be larger than the cross-sectional area of the first reinforcing bar.

[0022] According to one or more embodiments, a method of manufacturing a battery pack includes: forming a monomer stack by arranging a plurality of battery monomers in a first direction; aligning a first plate and a second plate with respect to the monomer stack; bringing the second plate into contact with the monomer stack; installing a spacer in a chamber provided between the first plate and the second plate; and assembling the monomer stack together with the first plate, the second plate, and the spacer in a housing.

[0023] Aligning the first plate and the second plate with respect to the monomer stack may include: fixing the first plate at a reference position; and arranging the monomer stack and the second plate to face each other in the first direction.

[0024] Bringing the second plate into contact with the monomer stack may include: inserting a pressing jig into a jig hole formed in the first plate; and moving the pressing jig toward the monomer stack and pressing the second plate.

[0025] During installing the spacer in a chamber provided between the first plate and the second plate, the spacer may be hardened after being injected in a liquid state between the first plate and the second plate.

[0026] During assembling the monomer stack together with the first plate, the second plate, and the spacer in a housing, the first plate may be in contact with the housing. Description of the Drawings

[0027] The drawings attached to this specification illustrate some embodiments of the present disclosure and further describe aspects and features of the present disclosure together with the detailed description of the present disclosure. However, the present disclosure should not be construed as being limited to the drawings:

[0028] Figure 1 is a perspective view schematically showing the structure of a battery pack according to an embodiment of the present disclosure;

[0029] Figure 2 is an enlarged view schematically showing the structure of a battery pack according to an embodiment of the present disclosure;

[0030] Figure 3 is a cross-sectional view schematically showing the structure of a battery pack according to an embodiment of the present disclosure;

[0031] Figure 4 is a perspective view schematically showing the structure of a battery cell according to an embodiment of the present disclosure;

[0032] Figure 5 is a cross-sectional view schematically showing the structure of a battery cell according to an embodiment of the present disclosure;

[0033] Figure 6 is a perspective view schematically showing the structure of an end plate according to an embodiment of the present disclosure;

[0034] Figure 7 and Figure 8 is a cross-sectional view schematically showing the structure of an end plate according to an embodiment of the present disclosure;

[0035] Figure 9 is an exploded perspective view schematically showing the structure of an end plate according to an embodiment of the present disclosure;

[0036] Figure 10 is a perspective view schematically showing the structure of a first sealing member according to an embodiment of the present disclosure;

[0037] Figure 11 is a cross-sectional view schematically showing the configuration of a first sealing member according to an embodiment of the present disclosure;

[0038] Figure 12 and Figure 13 is a view showing Figure 10 a modified example of the support member shown in;

[0039] Figure 14 is a view schematically showing the configuration of a reinforcing member according to an embodiment of the present disclosure;

[0040] Figure 15 is a flowchart schematically showing a manufacturing method of a battery pack according to an embodiment of the present disclosure;

[0041] Figure 16 is a flowchart schematically showing operation S200 according to an embodiment of the present disclosure;

[0042] Figure 17 is a view schematically showing the process of operation S200 according to an embodiment of the present disclosure;

[0043] Figure 18 is a flowchart schematically showing operation S300 according to an embodiment of the present disclosure;

[0044] Figure 19 and Figure 20 is a view schematically showing the process of operation S300 according to an embodiment of the present disclosure;

[0045] Figure 21 and Figure 22 is a view showing the moving state of the second plate according to the length deviation of the monomer stack;

[0046] Figure 23 and Figure 24 is a view schematically showing the process of operation S400 according to an embodiment of the present disclosure; and

[0047] Figure 25 is a view schematically showing the process of operation S500 according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0048] Here, some embodiments of the present disclosure will be described in further detail with reference to the accompanying drawings. Terms or words used in this specification and claims should not be construed as limited to the ordinary meaning or dictionary meaning, but should be interpreted as meanings and concepts consistent with the technical idea of the present disclosure based on the principle that the inventor can be his / her own lexicographer to appropriately define the terms.

[0049] The embodiments described in this specification and the configurations shown in the drawings are provided as some example embodiments of the present disclosure, and do not represent all technical ideas, aspects, and features of the present disclosure. Therefore, it will be understood that various equivalents and modifications of the embodiments described herein may be available or made at the time of filing this application.

[0050] It will be understood that when an element or layer is referred to as being "on", "connected to", or "coupled to" another element or layer, it can be directly on, directly connected to, or directly coupled to the other element or layer, or there can also be one or more intervening elements or layers. When an element or layer is referred to as being "directly on", "directly connected to", or "directly coupled to" another element or layer, there are no intervening elements or layers. For example, when a first element is described as being "coupled" or "connected" to a second element, the first element can be directly coupled or connected to the second element, or the first element can be indirectly coupled or connected to the second element via one or more intervening elements.

[0051] In the drawings, for clarity of illustration, the sizes of various elements, layers, etc. may be exaggerated. The same reference numerals denote the same or similar elements. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Further, when describing embodiments of the present disclosure, the use of "may" relates to "one or more embodiments of the present disclosure". Expressions such as "at least one of..." and "any one of..." when following a list of elements modify the entire list of elements and not an individual element of the list. When phrases such as "at least one of A, B, and C", "at least one of A, B, or C", "at least one selected from the group consisting of A, B, and C", or "at least one selected from among A, B, and C" are used to specify a list of elements A, B, and C, the phrase can refer to any and all suitable combinations or subsets of A, B, and C, such as A, B, C, A and B, A and C, B and C, or A and B and C. As used herein, the terms "use", "using...", and "being used" can be considered to be synonymous with the terms "utilize", "utilizing...", and "being utilized", respectively. As used herein, the terms "substantially", "about", and similar terms are used as approximate terms and not as terms of degree, and are intended to account for the inherent variations in measured or calculated values that would be recognized by a person of ordinary skill in the art.

[0052] It will be understood that although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or section from another element, component, region, layer, or section. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments.

[0053] For ease of description, spatial relationship terms such as "under", "below", "lower", "above", "upper", etc. may be used herein to describe the relationship of one element or feature to another element or feature as shown in the figures. It will be understood that, in addition to the orientation depicted in the figures, the spatial relationship terms are also intended to encompass other different orientations of the device during use or operation. For example, if the device in the figures is flipped, an element described as "below" or "beneath" another element or feature will be oriented "above" or "over" the other element or feature. Thus, the term "below" can encompass both an upper and a lower orientation. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatial relationship descriptors used herein should be interpreted accordingly.

[0054] The terms used herein are for the purpose of describing embodiments of the present disclosure and are not intended to limit the present disclosure. As used herein, the singular form "a" is also intended to include the plural form unless the context clearly indicates otherwise. It will be further understood that the terms "comprises", "comprising", "includes", and / or "including", when used in this specification, specify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0055] In addition, any numerical range disclosed and / or recited herein is intended to include all sub-ranges of the same numerical precision falling within the recited range. For example, the range "1.0 to 10.0" is intended to include all sub-ranges between the recited minimum value 1.0 and the recited maximum value 10.0 (and including the recited minimum value 1.0 and the recited maximum value 10.0), that is, all sub-ranges having a minimum value equal to or greater than 1.0 and a maximum value equal to or less than 10.0, such as, for example, 2.4 to 7.6. Any maximum numerical limitation recited herein is intended to include all lower numerical limitations subsumed therein, and any minimum numerical limitation recited in this specification is intended to include all higher numerical limitations subsumed therein. Thus, the applicant reserves the right to modify this specification (including the claims) to expressly recite any sub-ranges falling within the ranges expressly recited herein.

[0056] Two elements, features, etc. to be compared and referred to as "the same" may mean that they are "substantially the same". Thus, the phrase "substantially the same" may include cases having a deviation considered low in the art (e.g., a deviation of 5% or less). In addition, when a certain parameter is said to be uniform in a given region, this may mean that it is uniform in terms of the average value.

[0057] Throughout the specification, unless otherwise stated, each element may be singular or plural.

[0058] When any element is said to be arranged (or positioned or located) "above (or below)" or "on (or under)" a component, it may mean that the any element is placed in contact with the upper (or lower) surface of the component, or it may mean that another component may be interposed between the component and any element arranged (or positioned or located) on (or under) the component.

[0059] In addition, it will be understood that when an element is said to be "coupled", "linked" or "connected" to another element, the elements may be directly "coupled", "linked" or "connected" to each other, or there may be one or more intermediate elements between them, and the elements may be "coupled", "linked" or "connected" to another element through the one or more intermediate elements. In addition, when a part is said to be "electrically coupled" to another part, the part may be directly electrically connected to the other part, or there may be one or more intermediate parts between them such that the part and the other part are indirectly electrically connected to each other.

[0060] Throughout the specification, when stating "A and / or B", it means A, B, or A and B, unless otherwise stated. That is, "and / or" includes any or all combinations of the recited items. When stating "C to D", it means C or more and D or less, unless otherwise specified.

[0061] The terms used in this specification are for describing embodiments of the present disclosure and are not intended to limit the present disclosure.

[0062] Figure 1 is a perspective view schematically showing the configuration of a battery pack according to an embodiment of the present disclosure, Figure 2 is an enlarged view schematically showing the configuration of a battery pack according to an embodiment of the present disclosure, Figure 3 is a cross-sectional view schematically showing the configuration of a battery pack according to an embodiment of the present disclosure.

[0063] Refer to Figures 1 to 3 , the battery pack according to the present embodiment includes a housing 100, a cell stack 200, and an end plate 300.

[0064] The housing 100 forms a schematic appearance of the battery pack and can serve as a structure for overall support of the cell stack 200 and the end plates 300.

[0065] The housing 100 may include a housing body 110 and a cover 120.

[0066] The housing body 110 may be formed in an approximately box shape. The cross-sectional shape of the housing body 110 is not limited to Figure 1 the square shown, and its design can be changed to various shapes such as polygonal, circular or elliptical shapes.

[0067] A receiving space 111 for receiving the cell stack 200 may be formed inside the housing body 110. The receiving space 111 may be recessed inside the housing body 110 and may be formed in the shape of a groove having an open upper side. The receiving space 111 may have a rectangular cross-sectional shape. The receiving space 111 may have a predetermined length L1 in a direction parallel to the first direction and a predetermined width in a direction parallel to a second direction intersecting the first direction. Here, based on Figure 1 this, the first direction and the second direction may refer to directions parallel to the X-axis direction and the Y-axis direction, respectively.

[0068] A plurality of receiving spaces 111 may be provided. The plurality of receiving spaces 111 may be separated from each other by partition walls or the like. The plurality of receiving spaces 111 may be arranged in one or more rows along the first direction and the second direction. As an example, the plurality of receiving spaces 111 may be arranged in two rows along the first direction and four rows along the second direction. Alternatively, the receiving space 111 may also be formed as a single unit.

[0069] The cover 120 may be coupled to the housing body 110 and may enclose the internal space of the housing body 110, that is, the receiving space 111. As an example, the cover 120 may be formed in a substantially plate shape and may be provided to face the upper surface of the housing body 110. The cover 120 may be fixed to the housing body 110 by various types of coupling methods such as bolt coupling, welding coupling, insertion coupling, etc.

[0070] The cell stack 200 may be disposed inside the housing 100, and more specifically, inside the receiving space 111. The number of cell stacks 200 may be equal to the number of receiving spaces 111. When a plurality of receiving spaces 111 are formed, a plurality of cell stacks 200 may be provided, and each cell stack 200 may be separately received in a different receiving space 111.

[0071] The monomer stack 200 may include a plurality of battery monomers 210. The number of battery monomers 210 included in each monomer stack 200 may be the same.

[0072] The battery monomer 210 may be used as a unit structure for storing and supplying electric power in a battery pack.

[0073] Figure 4 is a perspective view schematically showing the configuration of a battery monomer according to an embodiment of the present disclosure, Figure 5 is a cross-sectional view schematically showing the configuration of a battery monomer according to an embodiment of the present disclosure.

[0074] Referring to Figure 4 and Figure 5 the battery monomer 210 may include at least one electrode assembly formed by winding a positive electrode 11 and a negative electrode 12 with a separator as an insulator interposed therebetween, a case 20 in which the electrode assembly is installed, and a cover assembly 30 coupled to an opening of the case 20.

[0075] Hereinafter, the battery monomer 210 is a lithium ion secondary battery and is described as an example of a prismatic shape. However, the present disclosure is not limited thereto, and the battery monomer 210 may be a lithium polymer battery or a cylindrical battery.

[0076] The positive electrode 11 and the negative electrode 12 may include a coated portion and uncoated portions 11a and 12a. The coated portion is an area where a current collector formed of a thin metal foil is coated with an active material, and the uncoated portions 11a and 12a are areas not coated with the active material.

[0077] The positive electrode 11 and the negative electrode 12 may be wound after interposing a separator 13 as an insulator therebetween. However, the present disclosure is not limited thereto, and the electrode assembly may have a structure in which a positive electrode and a negative electrode composed of a plurality of sheets are alternately stacked with a separator interposed therebetween.

[0078] The case 20 may form the overall appearance of the battery monomer 210 and may be made of a conductive metal such as aluminum, an aluminum alloy, or nickel-plated steel. In addition, the case 20 may provide a space for accommodating the electrode assembly therein.

[0079] The cover assembly 30 may include a cover plate 31 covering the opening of the case 20, and the case 20 and the cover plate 31 may be made of a conductive material. Here, a terminal 21 electrically connected to the positive electrode 11 or the negative electrode 12 may be installed to protrude outward through the cover plate 31.

[0080] In addition, a pair of terminals 21 protruding outward through the cover plate 31 may be formed. The pair of terminals 21 may be respectively connected to the positive electrode 11 and the negative electrode 12, and may be used as the positive electrode terminal and the negative electrode terminal of the battery cell 210. More specifically, the terminals 21 may be electrically connected to a current collector including a first current collector 40 and a second current collector 50 (hereinafter referred to as "positive current collector and negative current collector"), and the current collector is bonded to the positive electrode uncoated region 11a or the negative electrode uncoated region 12a by welding. For example, the positive electrode terminal 21 and the negative electrode terminal 21 may be bonded to the positive current collector 40 and the negative current collector 50 by welding. However, the present disclosure is not limited thereto, and the positive electrode terminal 21 and the negative electrode terminal 21, and the positive current collector 40 and the negative current collector 50 may be formed by integrally combining them. The outer peripheral surface of the upper column of the terminal 21 may have threads and be fixed to the cover plate 31 with a nut.

[0081] However, the present disclosure is not limited thereto, and the terminal 21 may have a rivet structure to be riveted, or may be welded to the cover plate 31.

[0082] In addition, the cover plate 31 may be made of a thin plate and bonded to the opening of the housing 20, and in the cover plate 31, an electrolyte inlet 32 where a sealing plug 33 will be installed may be formed, and an exhaust port 34 having a notch 34a formed therein may be installed.

[0083] The exhaust port 34 may be opened and closed depending on the change in the internal pressure of the housing 20. That is, during the normal operation of the electrode assembly, the exhaust port 34 may remain closed and seal the housing 20. When the internal pressure of the housing 20 rises above a set level due to overcharging or ignition, the exhaust port 34 may be opened, and emissions such as flames and gases may be discharged from the inside of the housing 20 to the outside of the housing 20.

[0084] In addition, an insulating member may be installed between the electrode assembly and the cover plate 31. Here, the insulating member may include a first lower insulating member 60 and a second lower insulating member 70, and each of the first lower insulating member 60 and the second lower insulating member 70 may be installed between the electrode assembly and the cover plate 31.

[0085] In addition, according to the present embodiment, one end of a separation member that can be installed to face one side surface of the electrode assembly may be installed between the insulating member and the terminal 21.

[0086] Here, the separation member may include a first separation member 80 and a second separation member 90.

[0087] Accordingly, respective ends of the first separation member 80 and the second separation member 90 that can be installed to face the side surfaces of the electrode assemblies can be installed between the first lower insulating member 60 and the positive electrode terminal 21 and between the second lower insulating member 70 and the negative electrode terminal 22.

[0088] As a result, the terminals 21 that are welded to the positive electrode current collector 40 and the negative electrode current collector 50 can be coupled to one end of each of the first lower insulating member 60 and the second lower insulating member 70 and one end of each of the first separation member 80 and the second separation member 90.

[0089] A plurality of battery cells 210 may be arranged in the accommodation space 111 along a first direction. Insulating sheets (not shown) for insulation and heat insulation may be provided between adjacent battery cells 210. The length of the cell stack 200 parallel to the first direction may be equal to the sum of the thickness of the battery cell 210 parallel to the first direction and the thickness of the insulating sheet. The length of the cell stack 200 parallel to the first direction may be shorter than the length of the accommodation space 111 parallel to the first direction. Accordingly, the cell stack 200 may provide a space that allows the end plate 300 to be installed in the accommodation space 111, which will be described below.

[0090] Due to thickness deviations of the battery cells 210 and the like, the actual length of the cell stack 200 may have a value different from the designed length. For example, when the thickness of the battery cell 210 included in the cell stack 200 is greater than the designed value, the actual length of the cell stack 200 may be greater than the designed length. In addition, when the thickness of the battery cell 210 included in the cell stack 200 is less than the designed value, the actual length of the cell stack 200 may be less than the designed length.

[0091] Accordingly, due to thickness deviations of the battery cells 210 and the like, at least one pair of the plurality of cell stacks 200 may be formed to have different lengths. That is, even when each cell stack 200 has the same number of battery cells 210, the lengths of any pair of cell stacks 200 may have different values.

[0092] The end plate 300 may be provided between the housing 100 and the cell stack 200. That is, the end plate 300 may be installed in the entire area of the accommodation space 111 except for the area where the cell stack 200 is provided. Both sides of the end plate 300 may be in close contact with the inner wall surfaces of the housing body 110 surrounding the accommodation space 111 and the cell stack 200, respectively. Accordingly, the end plate 300 may prevent the cell stack 200 from flowing or separating in the accommodation space 111.

[0093] During the process of manufacturing a battery pack, the end plate 300 can absorb the length error of the cell stack 200 generated due to the accumulation of thickness deviations of the battery cells 210. That is, the end plate 300 can serve as a component that maintains the sum of the length of the cell stack 200 parallel to the first direction and the thickness of the end plate 300 equal to the length L1 of the accommodation space 111 parallel to the first direction by deforming its own shape during the process of manufacturing the battery pack. For example, when the actual length of the cell stack 200 is greater than the designed length, the thickness of the end plate 300 can be less than the reference value, and when the actual length of the cell stack 200 is less than the designed length, the thickness of the end plate 300 can be greater than the reference value. Here, when the actual length of the cell stack 200 is equal to the designed length, the reference value of the thickness of the end plate 300 can refer to the thickness at which both sides of the end plate 300 are in close contact with the inner wall surface of the housing body 110 and the cell stack 200 respectively.

[0094] Multiple end plates 300 can be provided. Multiple end plates 300 can be individually installed for each cell stack 200. When a pair of cell stacks 200 have different lengths, each end plate 300 in contact with the pair of cell stacks 200 can have a different thickness. Therefore, the sum of the length of each cell stack 200 installed in different accommodation spaces 111 and the thickness of the end plate 300 can all be kept the same.

[0095] Therefore, the end plate 300 can prevent the phenomenon that the cell stack 200 is not smoothly inserted into the accommodation space 111 or the cell stack 200 is not firmly fixed in the accommodation space 111. In addition, when multiple cell stacks 200 are formed, the end plate 300 can improve the lifespan of the battery pack by preventing the occurrence of a pressure difference between the cell stacks 200.

[0096] A pair of end plates 300 can be installed in each accommodation space 111. The pair of end plates 300 installed in each accommodation space 111 can be arranged to be spaced apart from each other in a direction parallel to the first direction, and the cell stack 200 is inserted therebetween. The pair of end plates 300 installed in each accommodation space 111 can be arranged to individually face a pair of battery cells 210 provided at both ends of the cell stack 200.

[0097] Figure 6 is a perspective view schematically showing the structure of an end plate according to an embodiment of the present disclosure, Figure 7 and Figure 8 is a cross-sectional view schematically showing the structure of an end plate according to an embodiment of the present disclosure, Figure 9 is an exploded perspective view schematically showing the structure of an end plate according to an embodiment of the present disclosure.

[0098] Refer to Figures 1 to 9, the end plate 300 may include a first plate 310, a second plate 320, a chamber 330, and a spacer 340.

[0099] The first plate 310 may form the appearance of one side of the end plate 300 and may be in contact with the housing 100. The first plate 310 may be formed in a substantially flat plate shape. The first plate 310 may be disposed within the accommodation space 111 such that its two surfaces face the inner wall surface of the housing body 110 and the end of the monomer stack 200, respectively. The first plate 310 may be parallel to the battery monomer 210 disposed at the end of the monomer stack 200 and perpendicular to the first direction.

[0100] The inner surface of the first plate 310 may be spaced apart from the battery monomer 210 disposed at the end of the monomer stack 200 by a predetermined distance along the first direction. The outer surface of the first plate 310 may surround the accommodation space 111 and may be in contact with the inner wall surface of the housing body 110 perpendicular to the first direction. The distance between the outer surfaces of a pair of first plates 310 provided on each of a pair of end plates 300 installed in the accommodation space 111 may be equal to the length L1 of the accommodation space 111 parallel to the first direction.

[0101] The area of the first plate 310 may be smaller than the area of the battery monomer 210 perpendicular to the first direction. As an example, the ratio of the area of the first plate 310 to the area of the battery monomer 210 perpendicular to the first direction may be 80%.

[0102] The second plate 320 may form the appearance of the other side of the end plate 300 and may be disposed to face the first plate 310. The second plate 320 may be formed in a substantially flat plate shape. The second plate 320 may be disposed inside the accommodation space 111, and more specifically, between the inner surface of the first plate 310 and the end of the monomer stack 200. The second plate 320 may be parallel to the first plate 310 and perpendicular to the first direction.

[0103] The inner surface of the second plate 320 may be disposed to face the battery monomer 210 disposed at the end of the monomer stack 200. The outer surface of the second plate 320 may be disposed to face the inner surface of the first plate 310 spaced apart from it by a predetermined distance.

[0104] The area of the second plate 320 may be smaller than the area of the battery monomer 210 perpendicular to the first direction. As an example, the ratio of the area of the second plate 320 to the area of the battery monomer 210 perpendicular to the first direction may be 80%.

[0105] Before installing the spacer 340 to be described below, the second plate 320 may move in a direction parallel to the first direction. Depending on the direction of movement, the inner surface of the second plate 320 may contact or separate from the end of the monomer stack 200, and more specifically, may contact or separate from the battery monomer 210 provided at the end of the monomer stack 200.

[0106] A chamber 330 may be provided between the first plate 310 and the second plate 320. When the first plate 310 and the second plate 320 are spaced apart in the first direction, the chamber 330 may refer to an empty space formed between the inner surface of the first plate 310 and the outer surface of the second plate 320. The thickness of the chamber 330 parallel to the first direction may be changed by the movement of the second plate 320 relative to the first plate 310.

[0107] The spacer 340 may be provided in the chamber 330 such that the second plate 320 contacts the monomer stack 200. That is, after the second plate 320 contacts the monomer stack 200, the spacer 340 may serve as a component for fixing the thickness of the chamber 330 and restricting the movement of the second plate 320 in a direction away from the monomer stack 200. Therefore, the spacer 340 may keep the first plate 310 and the second plate 320 in a state of being firmly in contact with the housing 100 and the monomer stack 200, respectively.

[0108] Two surfaces of the spacer 340 may be fixed to the inner surface of the first plate 310 and the outer surface of the second plate 320, respectively. The spacer 340 may be provided to be elastically deformable. For example, the spacer 340 may be made of a synthetic resin material (such as epoxy resin, polyurethane, etc.). Therefore, when the battery monomer 210 expands due to overcharging or the like, the spacer 340 may absorb the expansion displacement of the battery monomer 210 through its own elastic deformation.

[0109] The spacer 340 may be hardened after being injected between the first plate 310 and the second plate 320 in a liquid state (that is, injected into the chamber 330 in a state where the second plate 320 contacts the monomer stack 200). Alternatively, the spacer 340 may be inserted into the chamber 330 after being hardened into a solid state.

[0110] The end plate 300 may further include a first sealing member 350.

[0111] The first sealing member 350 may be provided between the first plate 310 and the second plate 320, and may seal the chamber 330. The first sealing member 350 may serve as a component for movably supporting the second plate 320 relative to the first plate 310 and preventing the spacer 340 from leaking out of the chamber 330 during the process of injecting the spacer 340 into the chamber 330.

[0112] Figure 10is a perspective view schematically showing the configuration of a first sealing member according to an embodiment of the present disclosure, Figure 11 is a cross-sectional view schematically showing the configuration of a first sealing member according to an embodiment of the present disclosure.

[0113] Referring to Figures 6 to 11 , the first sealing member 350 may include a first sealing body 351 and a support member 352.

[0114] The first sealing body 351 may be disposed to surround a chamber 330 between the first plate 310 and the second plate 320. As an example, the first sealing body 351 may be formed in a strip shape extending along an edge region of the chamber 330. The first sealing body 351 may be disposed to surround a part of the edge region of the chamber 330, and one side of the chamber 330 may be connected to the external space of the first plate 310 and the second plate 320 through the first sealing body 351.

[0115] More specifically, as Figure 6 shown, the first sealing body 351 may be disposed to surround two side surfaces and a lower surface of the chamber 330, and may open an upper surface of the chamber 330. Accordingly, the first sealing body 351 may provide a path through which the spacer 340 is injected on the upper side of the chamber 330.

[0116] Both ends of the first sealing body 351 may be in close contact with the inner surface of the first plate 310 and the outer surface of the second plate 320, respectively. Accordingly, the first sealing body 351 may prevent the spacer 340 injected into the chamber 330 from leaking out.

[0117] The first sealing body 351 may be formed of an elastically deformable material such as rubber, silicone, etc. Accordingly, the first sealing body 351 may be in closer contact with the first plate 310 and the second plate 320 through its own elastic restoring force.

[0118] Sealing ribs 353 may be formed at ends of the first sealing body 351. The sealing ribs 353 may protrude from the ends of the first sealing body 351 in a direction parallel to the first direction. The sealing ribs 353 may be disposed such that their longitudinal directions are parallel to the direction in which the first sealing body 351 extends. The sealing ribs 353 may be formed of the same material as the first sealing body 351.

[0119] In Figure 10 and Figure 11 , as an example, the sealing ribs 353 are shown as being formed only on one end of the first sealing body 351 facing the first plate 310, but the sealing ribs 353 are not limited thereto, and may be formed only on the other end of the first sealing body 351 facing the second plate 320, or may be formed on both ends of the first sealing body 351.

[0120] The sealing rib 353 may be formed to narrow toward its end. As an example, the sealing rib 353 may be formed to have a cross-sectional shape that is approximately semi-circular. Accordingly, the sealing rib 353 may increase the amount of pressure transferred per unit area from the first plate 310 or the second plate 320, such that the first sealing body 351 contacts the first plate 310 or the second plate 320 more closely.

[0121] A plurality of sealing ribs 353 may be formed. The plurality of sealing ribs 353 may be arranged to be spaced apart from each other on the surface at the end of the first sealing body 351. As an example, the plurality of sealing ribs 353 may be arranged in a direction intersecting the direction in which the first sealing body 351 extends. Accordingly, the plurality of sealing ribs 353 may block the path through which the spacer 340 injected in a liquid state leaks out in multiple stages.

[0122] Both ends of the first sealing body 351 may be integrally fixed to the inner surface of the first plate 310 and the outer surface of the second plate 320, respectively. Both ends of the first sealing body 351 may be directly fixed to the inner surface of the first plate 310 and the outer surface of the second plate 320 by means of an adhesive, insertion coupling, etc., or may be indirectly fixed by means of a support member 352, etc., which will be described below. When the second plate 320 moves relative to the first plate 310, the first sealing body 351 may expand and contract in a direction parallel to the first direction by its own elastic restoring force. Accordingly, the first sealing body 351 may remain in close contact with the first plate 310 and the second plate 320 while allowing the second plate 320 to move.

[0123] The support member 352 may support the first sealing body 351 between the first plate 310 and the second plate 320. That is, the support member 352 may serve as a component for preventing the first sealing body 351 from separating from the set position between the first plate 310 and the second plate 320. The support member 352 may be fixed to at least one of the first plate 310 and the second plate 320.

[0124] Hereinafter, as an example, the support member 352 will be described as being fixed to the second plate 320, as Figure 10 and Figure 11 shown. However, the support member 352 is not limited thereto, but may be fixed to the first plate 310 or both the first plate 310 and the second plate 320.

[0125] As an example, the support member 352 can be formed in the shape of a rod protruding from the second plate 320 toward the chamber 330. The support member 352 can be arranged such that one of its surfaces faces the side surface of the first seal 351. The surface of the support member 352 that is arranged to face the side surface of the first seal 351 can be formed in a hook shape. The surface of the support member 352 that is arranged to face the side surface of the first seal 351 can be hooked to the side surface of the first seal 351. A pair of support members 352 can be formed. The pair of support members 352 can be arranged to face the two side surfaces of the first seal 351 respectively, and can be hooked to the two side surfaces of the first seal 351 respectively. In this case, one end of the first seal 351 facing the first plate 310 can be fixed to the inner surface of the first plate 310 using an adhesive or the like.

[0126] Figure 12 and Figure 13 is a view showing Figure 10 a modified example of the support member shown in

[0127] Referring to Figure 12 , the support member 352 can be formed in the shape of a rod protruding from the second plate 320 toward the chamber 330. The support member 352 can be inserted into the first seal 351. The support member 352 can have a stepped structure at its center such that the support member 352 engages with the inside of the first seal 351. One end of the first seal 351 facing the first plate 310 can be fixed to the inner surface of the first plate 310 using an adhesive or the like.

[0128] Referring to Figure 13 , the support member 352 can be formed in the shape of a sheet having an adhesive material applied to both of its surfaces. The support member 352 can be arranged between the second plate 320 and the end of the first seal 351, and its two surfaces can be attached to the surfaces of the second plate 320 and the end of the first seal 351 respectively. One end of the first seal 351 facing the first plate 310 can be fixed to the inner surface of the first plate 310 using an adhesive or the like.

[0129] The end plate 300 can further include a jig hole 360 and a second seal member 370.

[0130] The jig hole 360 may be formed through the first plate 310. The jig hole 360 may serve as a component for providing a path through which a pressing jig for moving the second plate 320 relative to the first plate 310 is inserted into the chamber 330 during the process of manufacturing the battery pack. The jig hole 360 may pass through the outer surface and the inner surface of the first plate 310 in a direction parallel to the first direction. Two surfaces of the jig hole 360 may be connected to the outer space of the first plate 310 and the chamber 330, respectively. The design of the cross-sectional shape of the jig hole 360 may be changed into various shapes other than the Figure 9 square shape shown, such as a circular shape, an elliptical shape, or a polygonal shape.

[0131] A plurality of jig holes 360 may be provided. The plurality of jig holes 360 may be arranged to be spaced apart from each other on the first plate 310. As an example, a pair of jig holes 360 may be formed, and the pair of jig holes 360 may be spaced apart from each other along a second direction intersecting the first direction.

[0132] The second sealing member 370 may be spaced apart from the first sealing member 350 and may seal the jig hole 360. That is, the second sealing member 370 may serve as a component for preventing the spacer 340 from leaking out of the chamber 330 through the jig hole 360 during the process of injecting the spacer 340 into the chamber 330.

[0133] The second sealing member 370 may include a second sealing body 371 and a guide hole 372.

[0134] The second sealing body 371 may be arranged to face the jig hole 360 within the chamber 330. The cross-sectional area of the second sealing body 371 may be formed to be larger than the cross-sectional area of the jig hole 360. Both ends of the second sealing body 371 may be in close contact with the inner surface of the first plate 310 and the outer surface of the second plate 320, respectively. Both ends of the second sealing body 371 may be fixed to the inner surface of the first plate 310 and the outer surface of the second plate 320 by various bonding methods, such as adhesives, insertion bonding, welding, etc. Therefore, the second sealing body 371 may prevent the spacer 340 injected into the chamber 330 from leaking out through the jig hole 360.

[0135] The second sealing body 371 may be formed of an elastically deformable material such as rubber, silicone, etc. Therefore, the second sealing body 371 may be in closer contact with the first plate 310 and the second plate 320 by its own elastic restoring force, and may expand and contract in a direction parallel to the first direction when the second plate 320 moves relative to the first plate 310.

[0136] A plurality of second seals 371 may be provided. The number of the second seals 371 may be the same as the number of the jig holes 360. Each second seal 371 may be arranged to individually face a different jig hole 360.

[0137] The guide hole 372 may pass through the second seal 371 and be connected to the jig hole 360. That is, the guide hole 372 may serve as a component for guiding the movement of the pressurizing jig inserted into the jig hole 360 within the second seal 371. The guide hole 372 may pass through both ends of the second seal 371 in a direction parallel to the first direction. The guide hole 372 may be arranged such that one of its surfaces is connected to the jig hole 360 and the other surface faces the outer surface of the second plate 320. The design of the cross-sectional shape of the guide hole 372 may be changed into various shapes other than Figure 9 the square shown, such as a circular shape, an elliptical shape, or a polygonal shape.

[0138] The area of the guide hole 372 may be larger than the area of the jig hole 360. Thus, interference of the guide hole 372 with the pressurizing jig inserted into the jig hole 360 can be prevented.

[0139] The end plate 300 may further include a reinforcing member 380.

[0140] The reinforcing member 380 may be disposed between the first plate 310 and the second plate 320 and be coupled to the spacer 340. The reinforcing member 380 may serve as a component for strengthening the mechanical strength of the spacer 340 and the coupling force between the spacer 340 and the first plate 310 or the second plate 320.

[0141] A plurality of reinforcing members 380 may be provided. The plurality of reinforcing members 380 may be formed in a shape of a rod protruding from at least one of the first plate 310 and the second plate 320 toward the spacer 340. Hereinafter, as an example, the reinforcing member 380 will be described as protruding from both the first plate 310 and the second plate 320. However, the reinforcing member 380 is not limited thereto, but may protrude only from the first plate 310 or the second plate 320.

[0142] Figure 14 is a view schematically showing the configuration of the reinforcing member according to an embodiment of the present disclosure.

[0143] Referring to Figure 14 FIG., the reinforcing member 380 may include a first reinforcing rod 381 and a second reinforcing rod 382.

[0144] The first reinforcing bar 381 may form the appearance of one side of the reinforcing member 380 and support the second reinforcing bar 382, which will be described below. The first reinforcing bar 381 may be formed in a shape of a bar extending from the first plate 310 or the second plate 320 toward the chamber 330 in a direction parallel to the first direction. When the spacer 340 is injected into the chamber 330, the first reinforcing bar 381 may be inserted into the spacer 340.

[0145] The second reinforcing bar 382 may form the appearance of the other side of the reinforcing member 380 and may be connected to the first reinforcing bar 381. The second reinforcing bar 382 may be formed in a shape of a bar extending from the end of the first reinforcing bar 381 in a direction parallel to the first reinforcing bar. The cross-sectional area of the second reinforcing bar 382 may be larger than the cross-sectional area of the first reinforcing bar 381. Thus, by forming a stepped structure in the boundary region with the first reinforcing bar 381, the second reinforcing bar 382 may further enhance its bonding force with the spacer 340.

[0146] Hereinafter, a method of manufacturing a battery pack according to an embodiment of the present disclosure will be described.

[0147] Figure 15 is a flowchart schematically showing a method of manufacturing a battery pack according to an embodiment of the present disclosure.

[0148] Referring to Figure 15 , first, a module stack 200 is formed by arranging a plurality of battery cells 210 in the first direction (S100).

[0149] Operation S100 may be performed the number of times corresponding to the number of module stacks 200 assembled in the housing 100.

[0150] Then, the end plates 300, more specifically, the first plate 310 and the second plate 320 are aligned with respect to the module stack 200 (S200).

[0151] Figure 16 is a view schematically showing operation S200 according to an embodiment of the present disclosure, Figure 17 is a view schematically showing the process of operation S200 according to an embodiment of the present disclosure.

[0152] Referring to Figure 16 and Figure 17 Operation S200 will be described in detail. First, the first plate 310 is fixed at a reference position (S210). The reference position of the first plate 310 may refer to a position where the sum of the thickness of the end plate 300 parallel to the first direction and the length of the module stack 200 is equal to the length L1 of the accommodation space 111 parallel to the first direction.

[0153] As an example, in the operation of S210, each of the pair of end plates 300 may be fixed at a position (i.e., the reference position) where the distance L2 between the outer surfaces of the pair of first plates 310 is equal to the length L1 of the accommodation space 111 parallel to the first direction. In this case, the pair of first plates 310 may be held in a fixed state at the reference position by a separate fixing device such as a fixing jig (not shown).

[0154] Then, the monomer stack 200 and the second plate 320 are arranged to face each other in the first direction (S220).

[0155] As an example, in the operation of S220, the monomer stack 200 may be arranged between a pair of end plates 300 spaced apart from each other in the first direction. The inner surfaces of the pair of second plates 320 and the ends of the monomer stack 200 may face each other in the first direction and may be spaced apart from each other by a predetermined distance in the first direction.

[0156] After the operation of S200, the second plate 320 is brought into contact with the monomer stack 200 (S300).

[0157] Figure 18 is a flowchart schematically showing the operation S300 according to an embodiment of the present disclosure, Figure 19 and Figure 20 is a view schematically showing the process of the operation S300 according to an embodiment of the present disclosure.

[0158] Referring to Figures 18 to 20 Operation S300 will be described in detail. The pressing jig A is inserted into the jig hole 360 formed in the first plate 310 (S310).

[0159] The pressing jig A may be exemplified as various types of pressing devices having a rod shape with a cross-sectional area allowing insertion into the jig hole 360 and capable of moving back and forth in a direction parallel to the first direction by a driving force applied from the outside.

[0160] Then, the pressing jig A is moved to press the second plate 320 toward the monomer stack 200 (S320).

[0161] In the operation of S320, the pressing jig A inserted into the jig hole 360 may move toward the second plate 320 while sequentially passing through the jig hole 360 and the guide hole 372, and the end of the pressing jig A may contact the outer surface of the second plate 320.

[0162] The pressing jig A continues to move toward the second plate 320 in a state of contacting the outer surface of the second plate 320, and the second plate 320 moves toward the monomer stack 200 in a direction parallel to the first direction by the pressure applied from the pressing jig A.

[0163] In this case, the first sealing member 350 and the second sealing member 370 can expand and contract in a direction parallel to the first direction while maintaining a state of being in close contact with the first plate 310 and the second plate 320.

[0164] When the second plate 320 moves a predetermined distance or more towards the monomer stack 200, the inner surface of the second plate 320 comes into contact with the surface of the end portion of the monomer stack 200.

[0165] Figure 21 and Figure 22 are views showing the movement state of the second plate according to the length deviation of the monomer stack.

[0166] Referring to Figure 21 , when the length of the monomer stack 200 parallel to the first direction is formed to be greater than Figure 19 due to the accumulation of thickness errors of the battery cells 210, compared with Figure 19 , the second plate 320 can move a relatively short distance to come into contact with the monomer stack 200. In this case, the thickness of the chamber 330 parallel to the first direction can be formed to be relatively smaller than Figure 19 the thickness.

[0167] Referring to Figure 22 , when the length of the monomer stack 200 parallel to the first direction is formed to be smaller than Figure 19 due to the accumulation of thickness errors of the battery cells 210, compared with Figure 19 , the second plate 320 can move a relatively long distance to come into contact with the monomer stack 200. In this case, the thickness of the chamber 330 parallel to the first direction can be formed to be relatively larger than Figure 19 the thickness.

[0168] After the operation S300, a spacer 340 is installed in the chamber 330 provided between the first plate 310 and the second plate 320 (S400).

[0169] Figure 23 and Figure 24 are views schematically showing the process of the operation S400 according to an embodiment of the present disclosure.

[0170] Referring to Figure 23 and Figure 24 , in the operation S400, the spacer 340 can be injected into the chamber 330 in a molten liquid state. The operation S400 can be performed by various types of injection devices (not shown) such as a syringe.

[0171] In operation S400, the spacer 340 can be prevented from leaking out of the chamber 330 by the first sealing member 350 and the second sealing member 370.

[0172] In this case, the pressurizing jig A can be kept in a state of being inserted into the jig hole 360.

[0173] Then, the spacer 340 can be hardened into a solid state, and its two surfaces can be fixed to the first plate 310 and the second plate 320 respectively.

[0174] The spacer 340 can limit the movement of the second plate 320 in the direction away from the monomer stack 200 by its own repulsive force and keep the second plate 320 and the monomer stack 200 in a state of being in contact with each other.

[0175] After the spacer 340 is completely hardened, the pressurizing jig A moves in a direction away from the second plate 320 and separated from the jig hole 360.

[0176] After operation S400, the monomer stack 200 is assembled together with the end plates 300 (that is, the first plate 310, the second plate 320, and the spacer 340) in the housing 100 (S500).

[0177] Figure 25 is a view schematically showing the process of operation S500 according to an embodiment of the present disclosure.

[0178] In operation S500, the monomer stack 200 can be transferred to the upper side of the accommodation space 111 together with the end plates 300. In this case, the second plate 320 of the end plates 300 can be kept in a state of being in contact with the end of the monomer stack 200 by a fixing jig or the like.

[0179] Then, the monomer stack 200 and the end plates 300 are inserted into the accommodation space 111.

[0180] Since the sum of the thickness of the end plates 300 parallel to the first direction and the length of the monomer stack 200 parallel to the first direction is equal to the length L1 of the accommodation space 111 parallel to the first direction, the outer surface of the first plate 310 can be in contact with the housing 100, more specifically, with the inner wall surface of the housing body 110, and the monomer stack 200 can be firmly supported within the accommodation space 111.

[0181] Operation S500 can be repeatedly performed on a plurality of monomer stacks 200.

[0182] According to the present disclosure, the monomer stack is directly assembled in the housing without a separate structure such as an existing side plate, thereby improving the total energy density.

[0183] According to the present disclosure, during the process of manufacturing a battery pack, since the end plate adjusts its thickness according to the length of the cell stack and absorbs the length error of the cell stack, it is possible to prevent the phenomenon that the cell stack is not smoothly inserted into the accommodation space or the cell stack is not firmly fixed within the accommodation space.

[0184] According to the present disclosure, the sum of the lengths of each cell stack installed in different accommodation spaces and the thickness of the end plate remains the same, thereby preventing pressure deviation between the cell stacks and increasing the lifespan of the battery pack.

[0185] However, the effects obtainable through the present disclosure are not limited to the above effects, and those skilled in the art will clearly understand other technical effects not mentioned from the following description of the present disclosure.

[0186] Although the present disclosure has been described with reference to the embodiments shown in the drawings, these embodiments are merely illustrative, and it should be understood that those skilled in the art can derive various modifications and equivalent other embodiments based on the embodiments.

Claims

1. A battery pack, characterized in that: include: shell; a cell stack disposed in the housing and comprising a plurality of battery cells arranged along a first direction; as well as an end plate disposed between the housing and the cell stack, The end plate comprises: a first plate configured to contact the housing; a second plate disposed to face the first plate and configured to contact or separate from the monomer stack while moving in a direction parallel to the first direction; a chamber disposed between the first plate and the second plate; and A spacer is disposed in the chamber so that the second plate contacts the cell stack.

2. The battery pack according to claim 1, characterized in that: The spacer is provided to be elastically deformable.

3. The battery pack according to claim 1, characterized in that: The spacer hardens after being injected into the cavity in a liquid state.

4. The battery pack according to claim 1, characterized in that: The end plate further includes a first sealing member disposed between the first plate and the second plate and configured to seal the chamber.

5. The battery pack according to claim 4, characterized in that: The first sealing member comprises: A first sealing body, arranged to surround the chamber and having two ends in close contact with the first plate and the second plate, respectively; and A support member is fixed to at least one of the first plate and the second plate and is configured to support the first sealing body.

6. The battery pack according to claim 5, characterized in that: The first sealing body expands and contracts in a direction parallel to the first direction depending on relative movement of the first plate and the second plate.

7. The battery pack according to claim 6, characterized in that: The first sealing body is provided to be elastically deformable.

8. The battery pack according to claim 5, characterized in that: One side of the chamber passes through the first sealing body and is connected to external spaces of the first plate and the second plate.

9. The battery pack according to claim 5, characterized in that: The first sealing member further includes a plurality of sealing ribs protruding from an end of the first sealing body.

10. The battery pack according to claim 4, characterized in that: The end plate further comprises: a fixture hole formed through the first plate; and A second sealing member is spaced apart from the first sealing member and is configured to seal the clamp hole.

11. The battery pack according to claim 10, characterized in that: The second sealing member comprises: a second sealing body disposed to face the fixture hole and having both ends in close contact with the first plate and the second plate, respectively; and A guide hole passes through the second sealing body and is configured to be connected to the clamp hole.

12. The battery pack according to claim 11, characterized in that: An area of ​​the guide hole is larger than an area of ​​the clamp hole.

13. The battery pack according to claim 1, characterized in that: Further included is a reinforcement member disposed between the first plate and the second plate and coupled to the spacer.

14. The battery pack according to claim 13, characterized in that: A plurality of reinforcing members are provided and protrude from at least one of the first plate and the second plate toward the spacer.

15. The battery pack according to claim 13, characterized in that: The reinforcing member comprises: a first reinforcing bar; and a second reinforcing bar connected to the first reinforcing bar, and A cross-sectional area of ​​the second reinforcing rod is greater than a cross-sectional area of ​​the first reinforcing rod.

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