Battery pack and method for manufacturing same

Abstract

The present disclosure relates to a battery pack capable of allowing smooth assembly and improving the lifetime of battery cells, and a method of manufacturing the same. 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 and a method of manufacturing the same. 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 driving motors of hybrid vehicles, electric vehicles, etc., and as batteries for power storage. Secondary batteries include an electrode assembly having a positive electrode and a negative electrode, a housing that accommodates the positive electrode and the negative electrode, an electrode terminal connected to the electrode assembly, and the like.

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

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

[0005] Aspects of embodiments of the present disclosure are directed to providing a battery pack and a method of manufacturing the same, which can allow smooth assembly and improve the lifespan of a battery cell.

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

[0007] According to one or more embodiments, a battery pack includes: a housing; a cell stack disposed in the housing and including a plurality of battery cells arranged along 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 in the chamber so 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 cavity 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 disposed to surround the chamber and having both ends in close contact with the first plate and the second plate, respectively; and a supporting 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 to be elastically deformable.

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

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

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

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

[0018] The area of ​​the guide hole may be larger than the area of ​​the fixture 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 reinforcement member may include: a first reinforcement rod; and a second reinforcement rod connected to the first reinforcement rod, and a cross-sectional area of ​​the second reinforcement rod may be greater than a cross-sectional area of ​​the first reinforcement rod.

[0022] According to one or more embodiments, a method for manufacturing a battery pack includes: forming a cell stack by arranging a plurality of battery cells in a first direction; aligning a first plate and a second plate relative to the cell stack; bringing the second plate into contact with the cell stack; installing a spacer in a cavity disposed between the first plate and the second plate; and assembling the cell 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 cell stack may include: fixing the first plate at a reference position; and disposing the cell 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 press jig into a jig hole formed in the first plate; and moving the press jig and pressurizing the second plate toward the monomer stack.

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

[0026] During assembling the cell stack with the first plate, the second plate and the spacer in the housing, the first plate may be in contact with the housing. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

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

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

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

[0035] Fig. 9 is an exploded perspective view schematically showing the configuration of an end plate according to one embodiment of the present disclosure;

[0036] Fig.10is a perspective view schematically showing a configuration of a first sealing member according to one embodiment of the present disclosure;

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

[0038] Fig.12 and Fig.13 It is shown Fig.10 A view of a modified example of a support member shown in FIG.

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

[0040] Fig.15 is a flow chart schematically showing a method for manufacturing a battery pack according to one embodiment of the present disclosure;

[0041] Fig.16 is a flowchart schematically showing operation S200 according to one embodiment of the present disclosure;

[0042] Fig.17 is a diagram schematically illustrating a process of operation S200 according to one embodiment of the present disclosure;

[0043] Fig.18 is a flowchart schematically showing operation S300 according to one embodiment of the present disclosure;

[0044] Fig.19 and Fig. 20 is a diagram schematically illustrating a process of operation S300 according to one embodiment of the present disclosure;

[0045] Fig.21 and Fig. 22 is a view showing a moving state of the second plate according to a length deviation of a single-unit stack;

[0046] Fig.23 and Fig.24 is a diagram schematically illustrating a process of operation S400 according to one embodiment of the present disclosure; and

[0047] Fig.25 is a view schematically illustrating the process of operation S500 according to one 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. The terms or words used in this specification and claims should not be interpreted as limited to the usual 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 lexicon compiler to appropriately define the concept of the term.

[0049] The embodiments described in this specification and the configurations shown in the accompanying 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 when submitting this application, there may be various equivalents and modifications that can replace or modify the embodiments described herein.

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

[0051] In the accompanying drawings, for the clarity of the illustration, the sizes of various elements, layers, etc. may be exaggerated. The same reference numerals represent the same or similar elements. As used herein, the term "and / or" includes any and all combinations of one or more related enumerated items. In addition, when describing the 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 column of elements, modify the entire column of elements without modifying the individual elements of the column. 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 of A, B, and C", or "at least one selected from the middle of A, B, and C" are used to specify a column of elements A, B, and C, the phrase may 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", "use ..." and "used" may be considered to be synonymous with the terms "utilize", "utilize ..." and "utilize", respectively. As used herein, the terms "substantially," "about," and similar terms are used as terms of approximation, rather than terms of degree, and are intended to account for the inherent variations in measurements or calculations that one of ordinary skill in the art would recognize.

[0052] It will be understood that although the terms first, second, third, etc. can be used here to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are used to distinguish an element, component, region, layer or part from another element, component, region, layer or part. Therefore, the first element, component, region, layer or part discussed below can be referred to as a second element, component, region, layer or part without departing from the teachings of the example embodiments.

[0053] For ease of description, spatial relational terms such as "under ...", "below ...", "below ...", "above ...", "on ...", etc. may be used here to describe the relationship of an element or feature to another element or feature as shown in the figure. It will be understood that in addition to the orientations depicted in the figures, the spatial relational terms are also intended to cover other different orientations of the device in use or operation. For example, if the device in the figure is turned over, the elements described as being "under" or "under" other elements or features will be oriented to be "above" or "above" the other elements or features. Therefore, the term "under ..." can cover both above and below orientations. The device can be oriented in other ways (rotated 90 degrees or in other orientations), and the spatial relational descriptors used here should be interpreted accordingly.

[0054] The terms used herein are intended to describe 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 "include", "includes ...", "includes" and / or "comprising ...", when used in this specification, indicate the existence of stated features, integers, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, integers, steps, operations, elements, parts and / or their groups.

[0055] In addition, any numerical range disclosed and / or described herein is intended to include all sub-ranges of the same numerical precision included in the described range. For example, the range of "1.0 to 10.0" is intended to include all sub-ranges between the described minimum value 1.0 and the described maximum value 10.0 (and including the described minimum value 1.0 and the described maximum value 10.0), that is, all sub-ranges with 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 limit described here is intended to include all lower numerical limits included therein, and any minimum numerical limit described in this specification is intended to include all higher numerical limits included therein. Therefore, the applicant reserves the right to modify this specification (including claims) to clearly describe any sub-range included in the scope clearly described here.

[0056] When two compared elements, features, etc. are referred to as "the same" it may mean that they are "substantially the same". Thus, the phrase "substantially the same" may include situations with deviations that are considered low in the art (e.g., 5% or less). In addition, when a parameter is referred to as being uniform in a given area, this may mean that it is uniform with respect to an average value.

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

[0058] When any element is referred to as being arranged (or placed or positioned) "on (or below)" or "on (or below)" a component, it may mean that the arbitrary element is placed in contact with the upper (or lower) surface of the component, or it may mean that another component may be inserted between the component and any element arranged (or placed or positioned) on (or below) the component.

[0059] Furthermore, it will be understood that when an element is referred to as being "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 intervening elements therebetween through which the element may be "coupled," "linked," or "connected" to another element. Furthermore, when a portion is referred to as being "electrically coupled" to another portion, the portion may be directly electrically connected to the other portion, or there may be one or more intervening portions therebetween such that the portion and the other portion are indirectly electrically connected to each other.

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

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

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

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

[0064] The housing 100 forms a schematic appearance of the battery pack, and may serve as a structure for integrally supporting the cell stack 200 and the end plate 300 .

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

[0066] The housing body 110 may be formed to have a substantially box-like shape. The cross-sectional shape of the housing body 110 is not limited to Figure 1 Although the square shape is shown in FIG. 1 , the design can be changed to various shapes, such as polygonal, circular or oval shapes.

[0067] The accommodation space 111 in which the cell stack 200 is accommodated may be formed inside the housing body 110. The accommodation space 111 may be recessed inside the housing body 110 and may be formed in a shape having a groove with an open upper side. The accommodation space 111 may have a rectangular cross-sectional shape. The accommodation space 111 may have a predetermined length L1 in a direction parallel to the first direction and a predetermined width in a second direction parallel to the first direction. Here, based on Figure 1 , 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 accommodation spaces 111 may be provided. The plurality of accommodation spaces 111 may be separated from each other by partition walls or the like. The plurality of accommodation spaces 111 may be arranged in one or more rows along the first direction and the second direction. As an example, the plurality of accommodation spaces 111 may be arranged in two rows along the first direction and in four rows along the second direction. Alternatively, the accommodation spaces 111 may also be formed as a single unit.

[0069] The cover 120 may be coupled to the housing body 110, and may close the inner space of the housing body 110, that is, the accommodation space 111. As an example, the cover 120 may be formed to have a substantially plate shape, and may be disposed 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, more specifically, inside the accommodation space 111. The number of the cell stacks 200 may be equal to the number of the accommodation spaces 111. When a plurality of accommodation spaces 111 are formed, a plurality of cell stacks 200 may be provided, and each cell stack 200 may be individually accommodated in a different accommodation space 111.

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

[0072] The battery cell 210 may serve as a unit structure for storing and supplying power in a battery pack.

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

[0074] Reference Figure 4 and Figure 5The battery cell 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 mounted, and a cap assembly 30 coupled to an opening of the case 20 .

[0075] Hereinafter, the battery cell 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 cell 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, which is a region where a current collector formed of a thin metal foil is coated with an active material, and uncoated portions 11a and 12a, which are regions not coated with an active material.

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

[0078] The case 20 may form the overall appearance of the battery cell 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 an electrode assembly therein.

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

[0080] In addition, a pair of terminals 21 protruding outward through the cap plate 31 may be formed. The pair of terminals 21 may be connected to the positive electrode 11 and the negative electrode 12, respectively, and may be used as the positive electrode terminal and the negative electrode terminal of the battery cell 210. More specifically, the terminal 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 a "positive current collector and a negative current collector"), which is bonded to the positive uncoated region 11a or the negative 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 as well as the positive current collector 40 and the negative current collector 50 may be formed by integrally combining. The outer peripheral surface of the upper column of the terminal 21 may be threaded and fixed to the cap plate 31 with a nut.

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

[0082] In addition, the cap plate 31 may be made of a thin plate and coupled to the opening of the housing 20, and in the cap plate 31, an electrolyte inlet 32 ​​where a sealing plug 33 is to be installed may be formed, and a vent 34 in which a recess 34a is formed may be installed.

[0083] The exhaust port 34 may be opened and closed depending on changes in the internal pressure of the case 20. That is, during normal operation of the electrode assembly, the exhaust port 34 may remain in a closed state and seal the case 20. When the internal pressure of the case 20 rises above a set level due to overcharge or fire, the exhaust port 34 may open and discharge emissions such as flames and gas from the inside of the case 20 to the outside of the case 20.

[0084] In addition, an insulating member may be installed between the electrode assembly and the cap plate 31. Here, the insulating member may include first and second lower insulating members 60 and 70, and each of the first and second lower insulating members 60 and 70 may be installed between the electrode assembly and the cap 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] Therefore, respective ends of the first and second separation members 80 and 90 that can be installed to face the side surface of the electrode assembly may be installed between the first lower insulation member 60 and the positive electrode terminal 21 and between the second lower insulation member 70 and the negative electrode terminal 22 .

[0088] As a result, the terminal 21 coupled to the positive and negative current collectors 40 and 50 by welding may be coupled to one end of each of the first and second lower insulating members 60 and 70 and one end of each of the first and second separating members 80 and 90 .

[0089] A plurality of battery cells 210 may be arranged along a first direction within the accommodation space 111. An insulating sheet (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. Therefore, the cell stack 200 may provide a space allowing the end plate 300 to be installed within the accommodation space 111, which will be described below.

[0090] The actual length of the cell stack 200 may have a value different from the designed length due to thickness deviation of the battery cell 210, etc. 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] Therefore, at least one pair of cell stacks 200 among the plurality of cell stacks 200 may be formed to have different lengths due to thickness deviations of the battery cells 210, etc. 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 disposed between the housing 100 and the cell stack 200. That is, the end plate 300 may be installed in the entire region of the accommodation space 111 except for the region where the cell stack 200 is disposed. Both sides of the end plate 300 may be in close contact with the inner wall surface of the housing body 110 surrounding the accommodation space 111 and the cell stack 200, respectively. Therefore, the end plate 300 may prevent the cell stack 200 from flowing or separating within the accommodation space 111.

[0093] During the process of manufacturing the battery pack, the end plate 300 can absorb the length error of the cell stack 200 generated by the accumulation of the thickness deviation of the battery cell 210. That is, the end plate 300 can be used as a component for maintaining 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 through its own shape deformation during the process of manufacturing the battery pack. For example, when the actual length of the cell stack 200 is greater than the design 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 design 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 design length, the reference value of the thickness of the end plate 300 can refer to the thickness of the two sides of the end plate 300 that are in close contact with the inner wall surface of the housing body 110 and the cell stack 200, respectively.

[0094] A plurality of end plates 300 may be provided. A plurality of end plates 300 may be separately installed for each monomer stack 200. When a pair of monomer stacks 200 have different lengths, each end plate 300 in contact with the pair of monomer stacks 200 may have different thicknesses. Therefore, the sum of the length of each monomer stack 200 installed in different accommodation spaces 111 and the thickness of the end plate 300 may all remain the same.

[0095] Therefore, the end plate 300 can prevent the cell stack 200 from being smoothly inserted into the accommodation space 111 or the cell stack 200 from being firmly fixed in the accommodation space 111. In addition, when a plurality of cell stacks 200 are formed, the end plate 300 can improve the life of the battery pack by preventing a pressure difference from occurring between the cell stacks 200.

[0096] A pair of end plates 300 may be installed in each accommodation space 111. The pair of end plates 300 installed in each accommodation space 111 may be disposed to be spaced apart from each other in a direction parallel to the first direction with the cell stack 200 interposed therebetween. The pair of end plates 300 installed in each accommodation space 111 may be disposed to individually face a pair of battery cells 210 disposed at both ends of the cell stack 200, respectively.

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

[0098] Reference 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 an 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 to have a substantially flat plate shape. The first plate 310 may be disposed in the accommodation space 111 so that its two surfaces face the inner wall surface of the housing body 110 and the end of the cell stack 200, respectively. The first plate 310 may be disposed parallel to the battery cell 210 disposed at the end of the cell stack 200 and perpendicular to the first direction.

[0100] The inner surface of the first plate 310 may be spaced apart from the battery cell 210 disposed at the end of the cell 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 the pair of first plates 310 provided on each of the 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 cell 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 cell 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 to have a substantially flat plate shape. The second plate 320 may be disposed inside the accommodation space 111, more specifically, between the inner surface of the first plate 310 and the end of the cell stack 200. The second plate 320 may be disposed 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 cells 210 disposed at the end of the cell 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 therefrom by a predetermined distance.

[0104] The area of ​​the second plate 320 may be smaller than the area of ​​the battery cell 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 cell 210 perpendicular to the first direction may be 80%.

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

[0106] The cavity 330 may be disposed 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 cavity 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 cavity 330 parallel to the first direction may be changed by movement of the second plate 320 relative to the first plate 310.

[0107] The spacer 340 may be disposed in the chamber 330 so that the second plate 320 contacts the cell stack 200. That is, after the second plate 320 contacts the cell stack 200, the spacer 340 may serve as a member for fixing the thickness of the chamber 330 and restricting the second plate 320 from moving in a direction away from the cell stack 200. Therefore, the spacer 340 may maintain the first plate 310 and the second plate 320 in a state of being firmly in contact with the housing 100 and the cell stack 200, respectively.

[0108] The 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 cell 210 expands due to overcharging, etc., the spacer 340 can absorb the expansion displacement of the battery cell 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 (ie, injected into the chamber 330 in a state where the second plate 320 is in contact with the cell 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 disposed 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 a process of injecting the spacer 340 into the chamber 330.

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

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

[0114] The first sealing body 351 may be provided to surround the cavity 330 between the first plate 310 and the second plate 320. As an example, the first sealing body 351 may be formed to have a strip shape extending along an edge region of the cavity 330. The first sealing body 351 may be provided to surround a portion of the edge region of the cavity 330, and one side of the cavity 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, if Figure 6 As shown, the first sealing body 351 may be disposed to surround both side surfaces and the lower surface of the chamber 330 and may open the upper surface of the chamber 330. Therefore, the first sealing body 351 may provide a path through which the spacer 340 is injected at 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. Therefore, 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. Therefore, the first sealing body 351 may be in closer contact with the first plate 310 and the second plate 320 by its own elastic restoring force.

[0118] The sealing rib 353 may be formed at an end of the first sealing body 351. The sealing rib 353 may protrude from the end of the first sealing body 351 in a direction parallel to the first direction. The sealing rib 353 may be disposed such that its longitudinal direction is parallel to the direction in which the first sealing body 351 extends. The sealing rib 353 may be formed of the same material as the first sealing body 351.

[0119] exist Fig.10 and Fig.11 , as an example, the sealing rib 353 is shown as being formed only on one end of the first sealing body 351 facing the first plate 310, but the sealing rib 353 is not limited thereto, but 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 semicircular. Therefore, the sealing rib 353 may increase the amount of pressure transmitted per unit area from the first plate 310 or the second plate 320, so that the first sealing body 351 is in closer contact with the first plate 310 or the second plate 320.

[0121] A plurality of sealing ribs 353 may be formed. The plurality of sealing ribs 353 may be disposed to be spaced apart from each other on the surface of the end of the first sealing body 351. As an example, the plurality of sealing ribs 353 may be arranged along a direction intersecting a direction in which the first sealing body 351 extends. Thus, 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] The two ends of the first sealing body 351 can be fixed to the inner surface of the first plate 310 and the outer surface of the second plate 320 in one piece, respectively. The two ends of the first sealing body 351 can be directly fixed to the inner surface of the first plate 310 and the outer surface of the second plate 320 by adhesive, insertion coupling, etc., or can be indirectly fixed by 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 can expand and contract in a direction parallel to the first direction by its own elastic restoring force. Therefore, the first sealing body 351 can maintain 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 being separated from a 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. Fig.10 and Fig.11 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 may be formed in the shape of a rod protruding from the second plate 320 toward the chamber 330. The support member 352 may be arranged so that one surface thereof faces the side surface of the first sealing body 351. The surface of the support member 352 arranged to face the side surface of the first sealing body 351 may be formed to have a hook shape. The surface of the support member 352 arranged to face the side surface of the first sealing body 351 may be hooked to the side surface of the first sealing body 351. A pair of support members 352 may be formed. The pair of support members 352 may be arranged to face the two side surfaces of the first sealing body 351, respectively, and may be hooked to the two side surfaces of the first sealing body 351, respectively. In this case, one end of the first sealing body 351 facing the first plate 310 may be fixed to the inner surface of the first plate 310 using an adhesive or the like.

[0126] Fig.12 and Fig.13 It is shown Fig.10 A view of a modified example of a supporting member shown in FIG.

[0127] Reference Fig.12 , the support member 352 may be formed in a shape having a rod protruding from the second plate 320 toward the chamber 330. The support member 352 may be inserted into the first sealing body 351. The support member 352 may have a step structure at the center so that the support member 352 is engaged with the inside of the first sealing body 351. One end of the first sealing body 351 facing the first plate 310 may be fixed to the inner surface of the first plate 310 using an adhesive or the like.

[0128] Reference Fig.13 , the support member 352 may be formed in a sheet shape having an adhesive material applied on both surfaces thereof. The support member 352 may be disposed between the second plate 320 and the end of the first sealing body 351, and both surfaces thereof may be attached to the surfaces of the second plate 320 and the end of the first sealing body 351, respectively. One end of the first sealing body 351 facing the first plate 310 may be fixed to the inner surface of the first plate 310 using an adhesive or the like.

[0129] The end plate 300 may further include a clamp hole 360 ​​and a second sealing member 370 .

[0130] The jig hole 360 ​​may be formed through the first plate 310. The jig hole 360 ​​may serve as a member for providing a path through which a pressurizing jig for moving the second plate 320 relative to the first plate 310 is inserted into the chamber 330 during a process of manufacturing a 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. Both surfaces of the jig hole 360 ​​may be connected to the first plate 310 and the outer space of the chamber 330, respectively. The design of the cross-sectional shape of the jig hole 360 ​​may be changed to include, in addition to Fig. 9 Various shapes other than the square shown, such as a circle, an ellipse or a polygonal shape.

[0131] A plurality of clamp holes 360 may be provided. The plurality of clamp holes 360 may be disposed to be spaced apart from each other on the first plate 310. As an example, a pair of clamp holes 360 may be formed and 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 a 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 disposed to face the fixture hole 360 ​​in 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 fixture 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 adhesive, insertion bonding, welding, etc. Therefore, the second sealing body 371 can prevent the spacer 340 injected into the chamber 330 from leaking out through the fixture 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 when the second plate 320 moves relative to the first plate 310, it may expand and contract in a direction parallel to the first direction.

[0136] A plurality of second sealing bodies 371 may be provided. The number of the second sealing bodies 371 may be the same as the number of the jig holes 360. Each of the second sealing bodies 371 may be disposed to face different jig holes 360 individually.

[0137] The guide hole 372 may pass through the second sealing body 371 and be connected to the clamp hole 360. That is, the guide hole 372 may be used as a member for guiding the movement of the pressurizing clamp inserted into the clamp hole 360 ​​within the second sealing body 371. The guide hole 372 may pass through both ends of the second sealing body 371 in a direction parallel to the first direction. The guide hole 372 may be provided so that one surface thereof is connected to the clamp hole 360 ​​and the other surface thereof faces the outer surface of the second plate 320. The design of the cross-sectional shape of the guide hole 372 may be changed to include Fig. 9 Various shapes other than the square shown, such as a circle, an ellipse or a polygonal shape.

[0138] The area of ​​the guide hole 372 may be greater than that of the jig hole 360. Therefore, the guide hole 372 may be prevented from interfering with the pressurizing jig inserted into the jig hole 360.

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

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

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

[0143] Reference Fig.14 , the reinforcement member 380 may include a first reinforcement rod 381 and a second reinforcement rod 382 .

[0144] The first reinforcing rod 381 may form an appearance of one side of the reinforcing member 380 and support the second reinforcing rod 382, ​​which will be described below. The first reinforcing rod 381 may be formed in a rod shape 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 rod 381 may be inserted into the spacer 340.

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

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

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

[0148] Reference Fig.15 , first, a cell stack 200 is formed by arranging a plurality of battery cells 210 along a first direction ( S100 ).

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

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

[0151] Fig.16 is a diagram schematically illustrating operation S200 according to one embodiment of the present disclosure, Fig.17 is a view schematically illustrating the process of operation S200 according to one embodiment of the present disclosure.

[0152] Reference Fig.16 and Fig.17 Describing operation S200 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 single stack 200 is equal to the length L1 of the accommodation space 111 parallel to the first direction.

[0153] As an example, in the S210 operation, each of the pair of end plates 300 may be fixed at a position (that is, a reference position) where a distance L2 between the outer surfaces of the pair of first plates 310 is equal to a 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 cell stack 200 and the second plate 320 are disposed to face each other in the first direction ( S220 ).

[0155] As an example, in operation S220, the cell stack 200 may be disposed 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 end of the cell 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 operation S200, the second plate 320 is brought into contact with the cell stack 200 (S300).

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

[0158] Reference Figures 18 to 20 Describing operation S300 in detail, the pressurizing jig A is inserted into the jig hole 360 ​​formed in the first plate 310 (S310).

[0159] The pressurizing jig A may be exemplified as various types of pressurizing means having a rod shape having 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 pressurizing jig A is moved to pressurize the second plate 320 toward the cell stack 200 ( S320 ).

[0161] In operation S320 , the pressurizing 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 an end of the pressurizing jig A may contact the outer surface of the second plate 320 .

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

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

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

[0165] Fig.21 and Fig. 22 is a view showing a moving state of the second plate according to a length deviation of a cell stack.

[0166] Reference Fig.21 , when the length of the cell stack 200 parallel to the first direction is formed to be greater than Fig.19 When the length is Fig.19 In contrast, the second plate 320 may move a relatively short distance to contact the cell stack 200. In this case, the thickness of the chamber 330 parallel to the first direction may be formed to be relatively smaller than Fig.19 Thickness.

[0167] Reference Fig. 22 , when the length of the cell stack 200 parallel to the first direction is formed to be less than Fig.19 When the length is Fig.19 In contrast, the second plate 320 may move a relatively long distance to contact the cell stack 200. In this case, the thickness of the chamber 330 parallel to the first direction may be formed to be relatively greater than Fig.19 Thickness.

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

[0169] Fig.23 and Fig.24 is a view schematically illustrating the process of operation S400 according to one embodiment of the present disclosure.

[0170] Reference Fig.23 and Fig.24 In operation S400, the spacer 340 may be injected into the cavity 330 in a molten liquid state. Operation S400 may be performed by various types of injection devices (not shown), such as a syringe.

[0171] In operation S400 , the spacer 340 may 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 may remain in a state of being inserted into the jig hole 360 ​​.

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

[0174] The spacer 340 may restrict movement of the second plate 320 in a direction away from the cell stack 200 by its own repulsive force, and maintain the second plate 320 and the cell stack 200 in a state of 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 cell stack 200 is assembled in the housing 100 together with the end plate 300 (ie, the first plate 310 , the second plate 320 , and the spacer 340 ) ( S500 ).

[0177] Fig.25 is a view schematically illustrating the process of operation S500 according to one embodiment of the present disclosure.

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

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

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

[0181] Operation S500 may be repeatedly performed on a plurality of cell stacks 200 .

[0182] According to the present disclosure, a cell stack is assembled directly within the housing without a separate structure, such as conventional side panels, thereby improving overall energy density.

[0183] According to the present disclosure, during a process of manufacturing a battery pack, since the end plate adjusts the thickness according to the length of the cell stack and absorbs the length error of the cell stack, it is possible to prevent the cell stack from being smoothly inserted into the accommodation space or being loosely fixed in the accommodation space.

[0184] According to the present disclosure, the sum of the length of each cell stack installed in different accommodation spaces and the thickness of the end plates is kept the same, thereby preventing pressure deviation between cell stacks and improving the life of the battery pack.

[0185] However, the effects obtainable by 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 is understood that those skilled in the art may derive various modifications and other equivalent embodiments based on the embodiments.

Claims

1. A battery pack comprising: 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, wherein: The spacer is provided to be elastically deformable.

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

4. The battery pack according to claim 1, wherein: 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, wherein: 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, wherein: 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, wherein: The first sealing body is provided to be elastically deformable.

8. The battery pack according to claim 5, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: An area of ​​the guide hole is larger than an area of ​​the clamp hole. 13 . The battery pack according to claim 1 , further comprising a reinforcing member disposed between the first plate and the second plate and coupled to the spacer.

14. The battery pack according to claim 13, wherein: 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, wherein: 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.

16. A method for manufacturing a battery pack, comprising: Forming a cell stack by arranging a plurality of battery cells in a first direction; aligning the first plate and the second plate relative to the cell stack; placing the second plate in contact with the cell stack; installing a spacer in a chamber disposed between the first plate and the second plate; as well as The cell stack is assembled in a housing together with the first plate, the second plate and the spacer.

17. The manufacturing method according to claim 16, wherein: Aligning the first plate and the second plate relative to the cell stack comprises: fixing the first plate at a reference position; and The cell stack and the second plate are arranged to face each other in the first direction.

18. The manufacturing method according to claim 16, wherein: Bringing the second plate into contact with the cell stack comprises: inserting a pressurizing jig into a jig hole formed in the first plate; and The pressurizing jig is moved and pressurizes the second plate toward the cell stack.

19. The manufacturing method according to claim 16, wherein: During installation of the spacer in the cavity provided between the first plate and the second plate, the spacer is hardened after being injected between the first plate and the second plate in a liquid state.

20. The manufacturing method according to claim 16, wherein: During assembling the cell stack together with the first plate, the second plate and the spacer in the housing, the first plate is in contact with the housing.

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