Battery cell stack

Abstract

A battery cell stack is provided. The battery cell stack can include a plurality of battery cells arranged in a width direction thereof, a partition member disposed between and partitioning a pair of battery cells among the plurality of battery cells, the partition member can include a partition body disposed between the pair of battery cells and extending in a height direction, and a cover body extending from the partition body to opposite sides in the width direction to collectively cover surfaces of the pair of battery cells on a side facing the height direction.

Description

Cross-reference to related applications

[0001] This application claims priority to U.S. Provisional Application No. 63 / 742,513, filed January 7, 2025, with the United States Patent and Trademark Office, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to a battery cell stack. Background Technology

[0003] As global efforts to reduce carbon emissions and promote sustainable transportation intensify, electric vehicles (EVs) have experienced significant growth in both consumer adoption and technological advancements. This growth places increasingly higher demands on the performance, reliability, and safety of the batteries that power these vehicles. Among the various available battery technologies, lithium-ion batteries have become the industry standard due to their high energy density, lightweight design, and efficient energy storage capabilities.

[0004] However, the widespread use of lithium-ion batteries has brought significant safety challenges. One of the core issues lies in the chemical properties of lithium, which is highly reactive. Under adverse conditions—such as mechanical shock, manufacturing defects, or high temperatures—this reactivity can lead to internal short circuits or chemical instability, potentially causing fires or explosions. These risks are particularly pronounced in EV applications, where a large number of individual battery cells are tightly packed into modules or battery packs to meet energy demands.

[0005] One of the most critical hazards is thermal runaway—a chain reaction triggered when a single battery cell overheats or catches fire, releasing heat and gases that can cause adjacent battery cells to fail. This cascading effect can rapidly jeopardize the entire battery system, compromising vehicle integrity and passenger safety.

[0006] Therefore, it is necessary to design battery cell stacks and battery packs with integrated safety mechanisms, such as those designed to detect early signs of failure, isolate affected battery cells, and prevent the spread of heat and combustion. Summary of the Invention

[0007] This disclosure is intended to address the aforementioned problems in the prior art while maintaining the advantages achieved by the prior art.

[0008] One aspect of this disclosure provides a battery cell stack that can delay the transfer of heat to adjacent battery cells even in the event of a fire in one battery cell.

[0009] The technical problems to be solved by this disclosure are not limited to those described above, and any other technical problems not mentioned herein will be clearly understood by those skilled in the art from the following description.

[0010] According to one aspect of this disclosure, a battery cell stack includes: a plurality of battery cells arranged along its width direction; a separator disposed between a pair of battery cells of the plurality of battery cells and separating the pair of battery cells, the separator comprising: a separator body disposed between the pair of battery cells and extending along its height direction; and a cover extending from the separator body to opposite sides in the width direction to collectively cover the surfaces of the pair of battery cells on the side facing the height direction.

[0011] The separating member may further include an end cap extending from the end cap to cover at least a portion of the pair of battery cells on one side in the longitudinal direction of the pair of battery cells.

[0012] The separating member may further include a guide cover disposed parallel to the end cover to cover at least a portion of the pair of battery cells on one side of the pair of battery cells along their length.

[0013] The partition member may further include a connecting body that connects the end cover and the guide cover, and has a thickness in the width direction greater than the thickness of the partition body.

[0014] Each of the pair of battery cells may include a cell lead portion extending toward one side in the length direction, and the connecting body may protrude from the separating body toward the cell lead portion of each of the pair of battery cells.

[0015] The connection body may be spaced apart from the lead portion of each of the pair of battery cells.

[0016] The battery cell stack may further include: an end plate disposed on one side of the plurality of battery cells in the width direction; and a support member disposed between the battery cell located at the end of the plurality of battery cells in the width direction and the end plate, and covering one side of the battery cell located at the end of the plurality of battery cells in the width direction.

[0017] The supporting member can be arranged parallel to the cover.

[0018] The support member may include: a support partition body disposed between the battery cell at one end in the width direction and the end plate and extending in the height direction; and a support cover extending from the support partition body toward the cover body.

[0019] The cover may include a cover vent formed on a region facing at least one of the pair of battery cells, or a cover cutout portion formed on a region facing at least one of the pair of battery cells and having a cutout shape or a thickness less than the thickness of the surrounding region. The battery cell stack may further include an internal fire-resistant member disposed between the cover and at least one of the pair of battery cells, and includes an internal cutout portion formed on a region facing the cover vent or the cover cutout portion and having a cutout shape or a thickness less than the thickness of the surrounding region.

[0020] The battery cell stack may further include: a sensing component including a busbar electrically connected to the plurality of battery cells and a sensing frame supporting the busbar and having a sensing hole formed in the region facing the plurality of battery cells; a sensing cover covering the outside of the sensing component and including a cover hole formed in the region facing the sensing hole; and a sensing fire-resistant member disposed between the sensing component and the sensing cover, and including a sensing cutout portion formed in the region facing the sensing hole and the cover hole and having a cutout shape or a thickness less than the thickness of the surrounding area.

[0021] The surface of the separator facing at least one of the pair of battery cells may be formed of a thermally conductive material or a material that is thermally insulating or fire-resistant.

[0022] The separating member may include a first separating member and a second separating member disposed parallel to the first separating member, and the battery cell stack may further include a blocking member disposed between i) the separating member and at least one of the pair of battery cells separated by the separating member, or ii) between the first separating member and the second separating member.

[0023] The barrier member may be formed of a material that has heat insulation or fire resistance or a material that has thermal conductivity.

[0024] The battery cell stack may further include a cooling plate disposed between the first separator and the second separator to cool the first separator and the second separator.

[0025] Each of the plurality of battery cells may include: a first electrode; a second electrode having a different polarity from the first electrode; a separator disposed between the first electrode and the second electrode; and a housing including an encapsulation region surrounding the first electrode, the second electrode and the separator, and an extension region extending from the encapsulation region toward one side of the length direction of the battery cell, and the extension region being bendable toward one side of the width direction to cover the encapsulation region on one side of the length direction. Attached Figure Description

[0026] The above and other objects, features and advantages of this disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.

[0027] Figure 1 This is a perspective view of a battery cell stack according to one embodiment of the present disclosure;

[0028] Figure 2 This is an exploded perspective view of a battery cell stack according to one embodiment of the present disclosure;

[0029] Figure 3 This is a longitudinal sectional view of a battery cell stack according to one embodiment of the present disclosure;

[0030] Figure 4 This is a perspective view of a battery cell and a separator in a battery cell stack according to one embodiment of the present disclosure;

[0031] Figure 5 This is a perspective view of a pair of separating members and a battery cell disposed therebetween, according to one embodiment of the present disclosure.

[0032] Figure 6 This is a perspective view of the partition member viewed from another direction according to one embodiment of the present disclosure;

[0033] Figure 7 This is a side view of a battery cell and a separator member viewed from the length direction according to one embodiment of the present disclosure;

[0034] Figure 8 This is a cross-sectional view of a battery cell and a separator according to one embodiment of the present disclosure;

[0035] Figure 9 This is a cross-sectional view of a battery cell and a separator according to one embodiment of the present disclosure;

[0036] Figure 10 This is a longitudinal sectional view of a separator, battery cell, barrier, and cooling plate according to one embodiment of the present disclosure.

[0037] Figure 11 This is a longitudinal sectional view of a separator, battery cell, barrier, and cooling plate according to one embodiment of the present disclosure.

[0038] Figure 12 This is a longitudinal sectional view of a separator, battery cell, barrier, and cooling plate according to one embodiment of the present disclosure.

[0039] Figure 13This is a longitudinal sectional view of a battery cell stack for illustrating a support member, according to another embodiment of the present disclosure.

[0040] Figure 14 This is a perspective view of a pair of separating members and a battery cell disposed therebetween, according to another embodiment of this disclosure.

[0041] Figure 15 This is a front view of the separator and battery cell viewed from the length direction according to another embodiment of the present disclosure;

[0042] Figure 16 This is a side view of the partition member and the battery cell as viewed from the width direction according to another embodiment of the present disclosure;

[0043] Figure 17 This is a longitudinal sectional view of the separator and battery cell according to another embodiment of the present disclosure;

[0044] Figure 18 This is a cross-sectional view of the separator and battery cell according to another embodiment of the present disclosure;

[0045] Figure 19 This is a cross-sectional view of the separator and battery cell according to another embodiment of the present disclosure;

[0046] Figure 20 This is a longitudinal sectional view of the partition member, support member, battery cell and end plate according to another embodiment of the present disclosure;

[0047] Figure 21 This is based on the purpose of illustration and Figure 20 A longitudinal sectional view of the partition member, support member, battery cell, and end plate of a different embodiment of the support member;

[0048] Figure 22 This is a longitudinal sectional view of the separator, battery cell, and barrier according to another embodiment of the present disclosure;

[0049] Figure 23 This is a perspective view of the battery cell and the separator as viewed in the length direction according to another embodiment of this disclosure;

[0050] Figure 24 This is a longitudinal sectional view of a battery cell and a separator according to yet another embodiment of the present disclosure;

[0051] Figure 25 This is a cross-sectional view of a battery cell and a separator according to yet another embodiment of the present disclosure;

[0052] Figure 26This is a cross-sectional view of a battery cell and a separator according to yet another embodiment of the present disclosure;

[0053] Figure 27 This is a longitudinal sectional view of the partition member, support member, battery cell and end plate according to another embodiment of the present disclosure.

[0054] Figure 28 It is used to explain and Figure 27 A longitudinal sectional view of the partition member, support member, battery cell, and end plate of another different support member;

[0055] Figure 29 This is a longitudinal sectional view of the separator, battery cell, and blocking member according to another embodiment;

[0056] Figure 30 This is a longitudinal sectional view of the separator, battery cell, and support member according to yet another embodiment;

[0057] Figure 31 This is based on the purpose of illustration and Figure 30 Longitudinal sectional views of the partition components, battery cells, and support components of different support structures;

[0058] Figure 32 This is a longitudinal sectional view of the separator, battery cell, and support member according to yet another embodiment;

[0059] Figure 33 This is based on the purpose of illustration and Figure 32 Longitudinal sectional views of the partition components, battery cells, and support components of different support structures;

[0060] Figure 34 This is a cross-sectional view of the separator, battery cell, and support member according to yet another embodiment;

[0061] Figure 35 This is based on the purpose of illustration and Figure 34 Longitudinal sectional views of the partition components, battery cells, and support components of different support structures;

[0062] Figure 36 This is a longitudinal sectional view of a battery cell stack according to one embodiment of the present disclosure;

[0063] Figure 37 yes Figure 36 Enlarged view of section A;

[0064] Figure 38 yes Figure 36 Enlarged view of section B;

[0065] Figure 39This is a front view of the first and second partition members as viewed from the length direction according to one embodiment of the present disclosure;

[0066] Figure 40 This is a perspective view of the first end cover of the first partition member and the second end cover of the second partition member according to one embodiment of the present disclosure;

[0067] Figure 41 This is a longitudinal sectional view of the first partition member and the second partition member when the first end cover of the first partition member and the second end cover of the second partition member are connected to each other;

[0068] Figure 42 This is a transverse cross-sectional view of the first partition member and the second partition member when the first guide cover of the first partition member and the second guide cover of the second partition member are connected to each other;

[0069] Figure 43 This is a side view of the end cover as viewed in the width direction according to yet another embodiment of the present disclosure;

[0070] Figure 44 This is an exploded perspective view showing the connection member and the guide connection member spaced apart from the end plate of the battery cell stack according to another embodiment of the present disclosure.

[0071] Figure 45 This is a side view of the separator, connecting member, guide connecting member and nut member of a battery cell stack, viewed from the length direction according to another embodiment of this disclosure.

[0072] Figure 46 This is a perspective view illustrating, according to one embodiment of the present disclosure, that one surface of the partition member is formed of a thermally conductive material or a thermally insulating material;

[0073] Figure 47 This is a view of the manufacturing process of a battery cell according to one embodiment of the present disclosure;

[0074] Figure 48 This is an enlarged view of the cover of a battery cell according to one embodiment of the present disclosure;

[0075] Figure 49 This is a cross-sectional view of a battery cell stack according to one embodiment of the present disclosure;

[0076] Figure 50 This is a cross-sectional view of a battery cell, a separator, and a sensing assembly according to another embodiment;

[0077] Figure 51This is a longitudinal sectional view of other battery cells, internal fire-resistant components, partition components, and external fire-resistant components according to one embodiment of this disclosure;

[0078] Figure 52 It is a plan view of a cover including a vent hole in the cover according to various embodiments;

[0079] Figure 53 These are side views and plan views of fire-resistant components, including the cut-out portion of the cover, as viewed from the longitudinal direction according to various embodiments.

[0080] Figure 54 This is a perspective view of a battery cell stack according to yet another embodiment of the present disclosure;

[0081] Figure 55 yes Figure 53 The image shows a cross-sectional view of the battery cell, sensing assembly, sensing fire-resistant component, and sensing cover; and

[0082] Figure 56 This is a plan view of a battery pack with a stack of battery cells installed according to one embodiment of the present disclosure. Detailed Implementation

[0083] Hereinafter, some embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. When adding reference numerals to the components in the drawings, it should be noted that the same components should be labeled the same as much as possible, even if the components are shown in different drawings. Furthermore, in describing embodiments of the present disclosure, detailed descriptions related to well-known functions or structures will be omitted if they may unnecessarily obscure the subject matter of the disclosure.

[0084] In describing the components of embodiments of this disclosure, terms such as first, second, A, B, (a), and (b) may be used herein. These terms are used only to distinguish one element from another and do not limit the respective elements, regardless of their nature, order, or priority. Furthermore, unless otherwise defined, all terms used herein, including technical and scientific terms, should be interpreted as having the meaning commonly understood in the art to which this disclosure pertains. Terms such as those defined in general dictionaries should be interpreted as having a meaning equivalent to that in the context of the relevant field and should not be interpreted as having an ideal or overly formal meaning unless expressly defined as such in this application.

[0085] In the following description, the width direction may refer to the X direction or the opposite direction of the X direction, and the length direction may refer to the Y direction or the opposite direction of the Y direction. Furthermore, the height direction may refer to the Z direction or the opposite direction of the Z direction.

[0086] In the following description, the width direction may be the width direction of the battery cell 110 or the width direction of the partition members 600, 600-1, 600-2, 600-3, 600-4, 600-5 and 600-6, or the width direction of the cover 620, 620-1, 620-2, 620-3, 620-4, 620a-5, 620b-5, 620a-6, 620b-6 and 620c-6, or the stacking direction of the battery cells 110.

[0087] In the following description, the height direction may refer to the direction in which the battery cell 110 extends from a surface of the battery pack 100 and 100-6 on which the battery cell 110 is mounted.

[0088] Figure 1 This is a perspective view of a battery cell stack according to one embodiment of the present disclosure. Figure 2 This is an exploded perspective view of a battery cell stack according to one embodiment of the present disclosure. Figure 3 This is a longitudinal sectional view of a battery cell stack according to one embodiment of the present disclosure.

[0089] Reference Figure 1 , Figure 2 and Figure 3 The battery cell stack 100 may include a battery cell 110, a pair of end plates 400, a pair of sensing covers 500, a pair of sensing components 510, and a separator 600.

[0090] The battery cells 110 may be arranged along the width direction (hereinafter referred to as the X direction or the opposite direction of the X direction). A plurality of battery cells 110 may be provided. Each of the plurality of battery cells 110 may extend along the length direction (hereinafter referred to as the Y direction or the opposite direction of the Y direction).

[0091] Here, the width direction can refer to the X direction or the opposite direction of the X direction, and can also refer to the stacking direction of the plurality of battery cells 110. In addition, the length direction can refer to the Y direction or the opposite direction of the Y direction, and can also refer to the length direction of the plurality of battery cells 110 or the length direction of the battery cell stack 100.

[0092] A pair of end plates 400 may be disposed on opposite sides of the battery cell 110 in the width direction. The pair of end plates 400 may provide surface pressure to the battery cell 110 on opposite sides.

[0093] The sensing component 510 and the sensing cover 500 may be disposed on each of the opposite sides of the battery cell 110 in the longitudinal direction. The sensing component 510 may include a busbar 550 electrically connected to the plurality of battery cells 110, and a sensing frame 520 supporting the busbar 550.

[0094] The sensing cover 500 can cover the outer side of the sensing component 510. The sensing cover 500 can be coupled to the pair of end plates 400.

[0095] A separator 600 may be disposed on one side (Z direction) of the plurality of battery cells 110 in the height direction to separate at least one of the plurality of battery cells 110. Here, the height direction may refer to the Z direction or the opposite direction of the Z direction. In addition, the height direction may be referred to as the vertical direction depending on the mounting direction of the battery cell stack 100.

[0096] A separator 600 may be disposed between a pair of battery cells 110 among the plurality of battery cells 110 to separate the pair of battery cells 110. The separator 600 may accommodate the plurality of battery cells 110 in separate spaces separated along the width direction.

[0097] like Figure 3 As shown, a battery cell 110 may include a first battery cell 111 and a second battery cell 112 that are adjacent to each other. Any of the plurality of separators 600 may be disposed between the pair of battery cells 110 including the first battery cell 111 and the second battery cell 112.

[0098] The separator 600 may include a separator body 610 and a cover 620. The separator body 610 and the cover 620 may be integrally formed. A plurality of separators 600 may be provided, such that their number is equal to or less than the number of the plurality of battery cells 110.

[0099] The separator 610 may be disposed between the pair of battery cells 110. The separator 610 may extend along the height direction.

[0100] The cover 620 may be disposed on one side of each of the pair of battery cells 110 in the height direction. One surface of each of the first battery cell 111 and the second battery cell 112 facing one side in the height direction may be covered by the cover 620.

[0101] The cover 620 can extend from the opposite end of the separating body 610 to one side in the width direction and together cover the opposite surfaces of the first battery cell 111 and the second battery cell 112.

[0102] The cover 620 can jointly cover the first battery cell 111 and the second battery cell 112 separated by the separator 610.

[0103] A support member 1000 may be disposed between the plurality of battery cells 110 and the pair of end plates 400. The support member 1000 may be disposed between the battery cell 110 located at one end in the width direction and the end plate 400, and cover one side of the battery cell 110 located at one end in the width direction. The support member 1000 may cover the side of the battery cell 110 facing the end plate 400.

[0104] End plate 400, support member 1000, the plurality of battery cells 110, separator member 600, and barrier member 800 and cooling plate 850, which will be described later, are accessible to thermal interface material (TIM) 200.

[0105] According to one embodiment of the present disclosure, the battery cell stack 100 may not include a substrate for contacting the thermal interface material (TIM) 200. However, the present disclosure is not limited thereto, and the battery cell stack 100 may further include a substrate covering the thermal interface material (TIM) 200.

[0106] Thermal interface material (TIM) 200 may be disposed on opposite sides of end plate 400, support member 1000, the plurality of battery cells 110, separator member 600, barrier member 800, and cooling plate 850 in the height direction (opposite directions in the Z direction), and may be used for adhering battery cell stack 100 to battery pack housing 1200 (see [link to product description]). Figure 55 The structure can be used to transfer the heat of the battery cell 110 to the battery pack housing 1200.

[0107] Figure 4 This is a perspective view of a battery cell and a separator member of a battery cell stack according to one embodiment of the present disclosure. Figure 5 This is a perspective view of a pair of separating members and a battery cell disposed therebetween, according to one embodiment of the present disclosure. Figure 6 This is a perspective view of the partition member viewed from another direction according to one embodiment of the present disclosure. Figure 7 This is a side view of a battery cell and a separator member viewed from the length direction according to one embodiment of the present disclosure. Figure 8 This is a cross-sectional view of a battery cell and a separator according to one embodiment of the present disclosure. Figure 9 This is a cross-sectional view of a battery cell and a separator according to one embodiment of the present disclosure.

[0108] Reference Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9The separator 600 can separate the plurality of battery cells 110 stacked along the width direction. The plurality of battery cells 110 can be stacked between a pair of adjacent separators 600.

[0109] Figure 5 The illustration shows four battery cells 110 stacked between a pair of adjacent separators 600, but the number of battery cells 110 disposed between the pair of adjacent separators 600 is not limited thereto.

[0110] In addition to the separating body 610 and the cover 620, the separating member 600 may further include an end cover 630, a guide cover 640, and a connecting body 650.

[0111] Although the terms "body", "partition body", "cover", "end cover", "guide cover" and "connecting body" can be used, the partition body 610, cover 620, end cover 630, guide cover 640 and connecting body 650 can be integrally formed.

[0112] The separator 610 and the cover 620 can extend along the length of the battery cell 110.

[0113] The cover 620 may include a cover body main area 621, a cover protruding area 622, a cover insertion slot 623, a cover cutout portion 624, or a cover ventilation hole 625 (see Figure 50 The cover 620 may further include cover ribs 626.

[0114] The protruding area 622 of the cover can be a portion that protrudes from the body area 621 of one of a pair of adjacent covers 620 toward the other cover 620.

[0115] A cover insertion slot 623 may be formed near the cover protrusion region 622, and may be a portion of the cover protrusion region 622 into which the cover protrusion region 622 of another cover 620 adjacent to the cover protrusion region 622 is inserted. The cover protrusion region 622 may be formed in a conical shape in a direction away from the cover body region 621, and the cover insertion slot 623 may be formed in a shape corresponding to the cover protrusion region 622 so as to insert the cover protrusion region 622.

[0116] The protruding area 622 and the insertion slot 623 can be portions for a pair of adjacent covers 620 that overlap each other. For example, the protruding area 622 and the insertion slot 623 can be located in the middle portion relative to the longitudinal direction of the cover 620 (the opposite direction of the Y direction or the Y direction).

[0117] The cover cutout 624 may be formed on the area of ​​the cover body region 621 facing the pair of battery cells 110 separated by the separator body 610, and may have a cutout shape or thickness less than the thickness of the surrounding area.

[0118] The cover ventilation hole 625 may be formed on the area of ​​the cover body region 621 facing the pair of battery cells 110 separated by the partition body 610, and may be formed to be through in the height direction.

[0119] The cover vent 625 and the cover cutout 624 are used to discharge foreign objects or high-pressure fluids caused by the fire into the battery cell stack 100 in the event of a fire in the battery cell 110 (see [link]). Figure 1 The area outside the main body can be selected according to the implementation method.

[0120] The cover cutout portion 624 may be formed as a pair, spaced apart from each other between the cover protrusion area 622 and the cover insertion groove 623.

[0121] The cover rib 626 may be a portion protruding from the cover body region 621 toward one side (Z direction) in the height direction toward another adjacent cover body region 621. Multiple cover ribs 626 may be provided along the longitudinal direction of the cover body region 621 (the opposite direction of the Y direction or the Y direction).

[0122] The end cover 630 may extend from the cover 620 to the opposite side in the height direction (opposite direction in the Z direction) to cover at least a portion of the pair of battery cells 110 on one side in the length direction of the pair of battery cells 110.

[0123] In other words, the cover 620 can cover one surface of the battery cell 110 facing one side in the height direction, and the end cover 630 can cover at least a portion of one surface of the battery cell 110 in the length direction.

[0124] The guide cover 640 may be disposed parallel to the end cover 630 to cover at least a portion of the pair of battery cells 110 on one side of the battery cell 110 in the longitudinal direction.

[0125] The end cap 630 and the guide cap 640 can together cover the opposite end regions of the pair of battery cells 110 in the height direction on one side of the length direction.

[0126] The end caps 630 of the pair of adjacent separating members 600 can contact each other, and the guide caps 640 of the pair of adjacent separating members 600 can also contact each other.

[0127] The pair of end caps 630 and the pair of guide caps 640 may have a structure to prevent foreign matter or high-pressure fluid generated from the battery cell 110 in the fire from being introduced through the opposite sides of the battery cell 110 in the length direction.

[0128] The connecting body 650 may be a part that connects the end cover 630 and the guide cover 640, and may extend from the end cover 630 to the guide cover 640.

[0129] The connecting body 650 can connect the end cover 630 and the guide cover 640. The thickness of the connecting body 650 in the width direction can be greater than the thickness of the separating body 610 in the width direction.

[0130] In one embodiment of this disclosure, the connecting body 650 of the separator 600 may protrude from the separator 610 to one side in the width direction. The connecting body 650 may collectively cover one side of the first battery cell 111 in the width direction.

[0131] Similar to the end cap 630 and the guide cap 640, the connecting body 650 can also be located on opposite sides of the separating body 610 in the longitudinal direction.

[0132] like Figure 7 As shown, the separator 600 can be disposed between the pair of battery cells 110 in the plurality of battery cells 110 and separate the pair of battery cells 110.

[0133] The partition member 600 may include a first partition member 600a and a second partition member 600b that are adjacent to each other. The first partition member 600a and the second partition member 600b may be formed in a corresponding structure. Both the first partition member 600a and the second partition member 600b may have Figure 6 The shape of the dividing member 600 shown.

[0134] The first separator 600a may be disposed between the pair of battery cells 110 separated by the separator 600, and may cover the first battery cell 111 of either of the pair of battery cells 110 separated by the separator 600.

[0135] The second separator 600b may be disposed between the second battery cell 112 of the other of the pair of battery cells 110 separated by the separator 600 and the first separator 600a, and may cover the second battery cell 112.

[0136] The first dividing member 600a and the second dividing member 600b may be symmetrically arranged along the width direction. The first dividing member 600a and the second dividing member 600b may constitute a unit and may be arranged along the width direction.

[0137] The first partition member 600a may include a first partition body 610a, a first cover 620a, a first end cover 630a, a first guide cover 640a, and a first connecting body 650a.

[0138] The second partition member 600b may include a second partition body 610b, a second cover 620b, a second end cover 630b, a second guide cover 640b, and a second connecting body 650b.

[0139] The first separator 610a can be disposed between the first battery cell 111 and the second separator 600b, and can extend along the height direction.

[0140] The first cover 620a may extend from the first partition body 610a to one side in the width direction (X direction) to cover one surface of the first battery cell 111 facing one side in the height direction (Z direction). The first cover 620a may extend from one end of the first partition body 610a in the height direction to one side in the width direction (X direction) to cover one surface of the first battery cell 111.

[0141] The first cover 620a may include a cover ventilation hole 625 formed in the region facing the first battery cell 111 (see...). Figure 50 ), or a cover cutout portion 624 formed in the region facing the first battery cell 111 and having a cutout shape or a thickness less than that of the surrounding region.

[0142] The cover ventilation hole 625 or the cover cutout portion 624 may be used to discharge foreign objects or high-pressure fluids caused by the fire into the battery cell stack 100 in the event of a fire in the battery cell 110 (see [link]). Figure 1 The external part.

[0143] The second separator 610b can be disposed between the second battery cell 112 and the first separator 610a, and can extend along the height direction.

[0144] The second cover 620b may extend from the second partition body 610b to the opposite side in the width direction (opposite direction of the X direction) to cover one surface of the second battery cell 112 facing one side in the height direction (Z direction). The second cover 620b may extend from the opposite end of the second partition body 610b to the opposite side in the width direction to cover one surface of the second battery cell 112.

[0145] The second cover 620b may include a cover vent 625 formed in the region facing the second battery cell 112, or a cover cutout portion 624 formed in the region facing the second battery cell 112 and having a cutout shape or a thickness less than the thickness of the surrounding region.

[0146] The cover ventilation hole 625 or the cover cutout portion 624 may be used to discharge foreign objects or high-pressure fluids caused by the fire into the battery cell stack 100 in the event of a fire in the battery cell 110 (see [link]). Figure 1 The external part.

[0147] The direction in which the first cover 620a extends from the first partition body 610a and the direction in which the second cover 620b extends from the second partition body 610b can be opposite to each other.

[0148] The first cover 620a may include a first cover main body region 621a, a first cover protruding region 622a, a first cover insertion groove 623b-6, a cover cutout portion 624, and a first cover rib 626a.

[0149] The second cover 620b may include a second cover main body region 621b, a second cover protruding region 622b, a second cover insertion groove 623b-6, a cover cutout portion 624, and a second cover rib 626b.

[0150] The first cover protruding region 622a can be inserted into the first cover insertion slot 623 of the second cover 620b, and the second cover protruding region 622b can be inserted into the second cover insertion slot 623 of the first cover 610b. The first cover protruding region 622a and the second cover protruding region 622b can extend in a direction opposite to the width direction (opposite to the X direction or the X direction).

[0151] The first cover rib 626a may protrude toward one side (Z direction) of the height direction of the second cover body region 621b, and the second cover rib 626b may protrude toward one side (Z direction) of the height direction of the first cover body region 621a.

[0152] According to this structure, even when the battery cell 110 expands and the first cover 620a and the second cover 620b are squeezed by the battery cell 110, the first cover 620a and the second cover 620b can be prevented from separating in the width direction (opposite to the X direction or the X direction) or the height direction (opposite to the Z direction or the Z direction), thereby maintaining a stable isolation structure between the battery cells 110.

[0153] Therefore, even if the battery cell 110 expands, the isolation structure between the battery cells 110 in the battery cell stack 100 is maintained, thereby maintaining the effect of delaying heat transfer between the battery cells 110.

[0154] The first end cover 630a may extend from the first cover 620a to the opposite side in the height direction (opposite direction in the Z direction) to cover at least a portion of the first battery cell 111 on one side in the length direction of the first battery cell 111. The first end cover 630a may protrude from the first cover 620a to the first cell lead portion 111a on one side in the length direction of the first battery cell 111.

[0155] The first guide cover 640a may be disposed parallel to the first end cover 630a to cover at least a portion of the first battery cell 111 on one side of the first battery cell 111 along its length. The first guide cover 640a may be connected to the first partition body 610a.

[0156] The first end cover 630a and the first guide cover 640a can together cover a portion of a side surface of the first battery cell 111 in the longitudinal direction.

[0157] The second end cover 630b may extend from the second cover 620b to the opposite side in the height direction (opposite direction in the Z direction) to cover at least a portion of the second battery cell 112 on one side in the length direction of the second battery cell 112. The second end cover 630b may protrude from the second cover 620b on one side in the length direction of the second battery cell 112, onto the second cell lead portion 112a.

[0158] The second guide cover 640b may be disposed parallel to the second end cover 630b to cover at least a portion of the second battery cell 112 on one side of the second battery cell 112 in the length direction.

[0159] The second end cover 630b and the second guide cover 640b can together cover a portion of a side surface of the second battery cell 112 in the longitudinal direction.

[0160] The first end cover 630a and the second end cover 630b can contact each other, and the first guide cover 640a and the second guide cover 640b can contact each other.

[0161] The first end cover 630a and the second end cover 630b can overlap each other, and the first guide cover 640a and the second guide cover 640b can overlap each other.

[0162] As described below, the first end cover 630a and the second end cover 630b can be connected to each other, and the first guide cover 640a and the second guide cover 640b can be connected to each other.

[0163] The thickness of the first end cover 630a in the height direction and the thickness of the first guide cover 640a in the height direction may be greater than the thickness of the first cover 620a in the height direction, and the thickness of the second end cover 630b in the height direction and the thickness of the second guide cover 640b in the height direction may be greater than the thickness of the second cover 620b.

[0164] According to this structure, the first separating body 610a and the second separating body 610b can isolate the first battery cell 111 from the second battery cell 112, the first cover 620a can cover one side of the first battery cell 111 in the height direction (Z direction), and the second cover 620b can cover one side of the second battery cell 112 in the height direction (Z direction).

[0165] Furthermore, based on the structure of the first end cover 630a, the second end cover 630b, the first guide cover 640a, and the second guide cover 640b, even if pressure is applied to the first end cover 630a, the second end cover 630b, the first guide cover 640a, and the second guide cover 640b due to the expansion in the battery cell 110, the relative positions of the first end cover 630a, the second end cover 630b, and the separator 600 will not change, and the separator 600 will not deform.

[0166] Therefore, the first end cover 630a, the second end cover 630b, the first guide cover 640a, and the second guide cover 640b will not deform even under pressure, and can firmly maintain the isolation structure between the battery cells 110. Therefore, even if a fire occurs in the battery cell 110, the isolation structure of multiple battery cells 110 can be maintained, and the thermoelectric conversion between the battery cells 110 can be delayed.

[0167] The thickness of the first connecting body 650a in the width direction may be greater than the thickness of the first separating body 610a in the width direction. The first connecting body 650a may extend from the first end cover 630a to the first guide cover 640a in the height direction.

[0168] The thickness of the second connecting body 650b in the width direction may be greater than the thickness of the second separating body 610b in the width direction. The second connecting body 650b may extend from the second end cover 630b to the second guide cover 640b in the height direction.

[0169] As an example, the first battery cell 111 may include a battery cell stack 100 (see [link to documentation]). Figure 1 The first cell lead portion 111a extends to opposite sides in the length direction of the cell stack 100, and the second cell 112 may include a second cell lead portion 112a extending to opposite sides in the length direction of the cell stack 100.

[0170] The first connecting body 650a and the second connecting body 650b can be disposed between the first single-unit lead portion 111a and the second single-unit lead portion 112a.

[0171] The first connecting body 650a may protrude further from the first separating body 610a toward the first cell lead portion 111a of the first battery cell 111, and may be spaced apart from the first cell lead portion 111a.

[0172] The second connecting body 650b may protrude further from the second separating body 610b toward the second cell lead portion 112a of the second cell 112, and may be spaced apart from the second cell lead portion 112a.

[0173] The first connecting body 650a, together with the first end cover 630a and the first guide cover 640a, can cover the area of ​​the first battery cell 111 on one side of its length direction, excluding the area where the first cell lead portion 111a is provided.

[0174] The second connecting body 650b, together with the second end cover 630b and the second guide cover 640b, can cover the area of ​​the second battery cell 112 on one side of its length direction, excluding the area where the second cell lead portion 112a is provided.

[0175] The first connecting body 650a may be disposed on one side (Y direction) of the longitudinal direction of the first battery cell 111, and the thickness of the first connecting body 650a in the width direction may be greater than the thickness of the first separating body 610a in the width direction. The second connecting body 650b may be disposed on one side (Y direction) of the longitudinal direction of the second battery cell 112, and the thickness of the second connecting body 650b in the width direction may be greater than the thickness of the second separating body 610b in the width direction.

[0176] Even in the structure of the first connecting body 650a and the second connecting body 650b, even if the battery cell 110 expands and pressure is applied to the first connecting body 650a and the second connecting body 650b, the relative positions of the first connecting body 650a and the second connecting body 650b will not change, and the separating member 600 will not deform, thus providing a stable isolation structure. Therefore, even if a fire occurs in the battery cell 110, the isolation structure of the battery cell 110 can be maintained, and heat transfer between the battery cells 110 can be delayed.

[0177] In one aspect of the battery cell 110, opposite sides of the battery cell 110 in the height direction may be covered by a thermal interface material 200 and a cover 620, one surface of the battery cell 110 in the width direction may be covered by a separating body 610, and a circumferential portion of opposite surfaces of the battery cell 110 in the length direction may be covered by an end cover 630, a guide cover 640 and a connecting body 650.

[0178] With this structure, even if any of the plurality of battery cells 110 catches fire, the separation member 600 according to one embodiment of the present disclosure can delay the transfer of heat to the other battery cell 110 that has not caught fire due to the construction of the separation body 610.

[0179] Furthermore, according to one embodiment of this disclosure, the partition member 600 can cover at least a portion of the opposing sides of the plurality of battery cells 110 in the longitudinal direction. Therefore, even if any of the plurality of battery cells 110 catches fire, foreign objects or high-pressure fluid can be prevented from being introduced through the other battery cell 110, which is not on fire, on one side in the longitudinal direction.

[0180] Furthermore, in the event of a fire in any of the plurality of battery cells 110, foreign matter or high-pressure fluid caused by the fire can be guided out of the battery cell stack 100 through the cover vent 625 or the cover cutout portion 624, and can be prevented from being introduced into another adjacent battery cell 110.

[0181] Furthermore, even if the battery cell 110 expands, it can prevent the end cover 630, guide cover 640 and connecting body 650 from changing position or deforming, thereby providing a robust isolation structure between the plurality of battery cells 110 and delaying heat transfer between the plurality of battery cells 110.

[0182] Figure 10 This is a longitudinal sectional view of a separator, battery cell, barrier, and cooling plate according to one embodiment of the present disclosure.

[0183] Reference Figure 10 The separator 600 may include a first separator 600a covering the first battery cell 111, and a second separator 600b disposed parallel to the first separator 600a and covering the second battery cell 112.

[0184] According to one embodiment of the present disclosure, a blocking member 800 may be provided, which is disposed between at least one of the first separating member 600a and the second separating member 600b and at least one of the first battery cell 111 and the second battery cell 112.

[0185] As an example, the blocking member 800 may be disposed between the first battery cell 111 and the first separating body 610a of the first separating member 600a, and between the second battery cell 112 and the second separating body 610b of the second separating member 600b.

[0186] As an example, the blocking member 800 may be disposed between the first battery cell 111 and the first separating body 610a of the first separating member 600a, and between the second battery cell 112 and the second separating body 610b of the second separating member 600b, and the cooling plate 850 may be disposed between the first separating body 610a and the second separating body 610b.

[0187] As an example, the blocking member 800 may be disposed only between the first battery cell 111 and the first partition body 610a of the first partition member 600a, and not between the second battery cell 112 and the second partition body 610b of the second partition member 600b.

[0188] As an example, the blocking member 800 may be disposed between the first separating body 610a of the first separating member 600a and the second separating body 610b of the second separating member 600b.

[0189] As an example, a blocking member 800 may be disposed between a first separating member 600a and a second separating member 600b. A pair of blocking members 800 may be provided, and the pair of blocking members 800 may respectively contact the first separating member 600a and the second separating member 600b, and a cooling plate 850 may be disposed between the pair of blocking members 800.

[0190] According to one embodiment, the blocking member 800 may be used in conjunction with the separating member 600, the blocking member 800 contacting i) at least one of a first battery cell 111 and a second battery cell 112 separated by the separating member 600, or ii) at least one of a first separating member 600a and a second separating member 600b.

[0191] The barrier member 800 may be formed of a material that is heat-insulating or fire-resistant, or a material that is thermally conductive.

[0192] Furthermore, according to one embodiment of this disclosure, the cooling plate 850 can be used together with the partition member 600, the cooling plate 850 being disposed between the first partition member 600a and the second partition member 600b, or between a pair of adjacent blocking members 800.

[0193] A cooling plate 850 may be disposed between the first partition member 600a and the second partition member 600b to cool the first partition member 600a and the second partition member 600b. The cooling plate 850 may also be disposed between a pair of blocking members 800 disposed between the first partition member 600a and the second partition member 600b.

[0194] The cooling plate 850 may be formed of a material with thermal conductivity. Alternatively, the cooling plate 850 may be formed of a material with heat dissipation properties. For example, the cooling plate 850 may be formed of aluminum.

[0195] The blocking member 800 or cooling plate 850 can receive heat from the separating member 600 or battery cell 110 in contact with it, and exchange heat with the cooling channels formed inside the battery pack housing 1200 through the thermal interface material 200. Here, the cooling channel may refer to the channel through which cooling water flows.

[0196] Figure 11 This is a longitudinal sectional view of a separator, battery cell, barrier, and cooling plate according to one embodiment of the present disclosure.

[0197] Reference Figure 11 According to one embodiment of the present disclosure, the separator 600 may include a first separator 600a covering the first battery cell 111, and a second separator 600b disposed parallel to the first separator 600a and covering the second battery cell 112.

[0198] Figure 11 The structure shown is formed of a first partition body 610a and a second partition body 610b from a thermally conductive material.

[0199] Thus, the first partition body 610a and the second partition body 610b are formed of a thermally conductive material, and the partition member 600 is operable. Figure 10 The function of the cooling plate 850 shown.

[0200] Even with this structure, according to one embodiment of the present disclosure, a blocking member 800 may be applied that contacts at least one of the first separating member 600a and the second separating member 600b, and at least one of the first battery cell 111 and the second battery cell 112 separated by the separating member 600.

[0201] As an example, the blocking member 800 may be disposed between the first battery cell 111 and the first separating body 610a of the first separating member 600a, and between the second battery cell 112 and the second separating body 610b of the second separating member 600b.

[0202] As an example, the blocking member 800 may be disposed between the first battery cell 111 and the first separating body 610a of the first separating member 600a, between the second battery cell 112 and the second separating body 610b of the second separating member 600b, and between the first separating body 610a and the second separating body 610b.

[0203] As an example, the blocking member 800 may be disposed only between the first battery cell 111 and the first partition body 610a of the first partition member 600a, and not between the second battery cell 112 and the second partition body 610b of the second partition member 600b.

[0204] As an example, the blocking member 800 may be disposed between the first separating body 610a of the first separating member 600a and the second separating body 610b of the second separating member 600b.

[0205] According to one embodiment of the present disclosure, the separator 600 may have a separator body 610 formed of a thermally conductive material, and a blocking member 800 may be used with the separator 600, the blocking member 800 contacting i) at least one of the pair of battery cells 110 separated by the separator 600, or ii) at least one of the first separator 600a and the second separator 600b.

[0206] The barrier member 800 may be formed of a material that is heat-insulating or fire-resistant, or a material that is thermally conductive.

[0207] Figure 12 This is a longitudinal sectional view of a separator, battery cell, barrier, and cooling plate according to one embodiment of the present disclosure.

[0208] Reference Figure 12 According to one embodiment of the present disclosure, the separator 600 may include a first separator 600a covering the first battery cell 111, and a second separator 600b disposed parallel to the first separator 600a and covering the second battery cell 112.

[0209] Figure 12 The structure shown is such that at least a portion of the first partition body 610a and at least a portion of the second partition body 610b are replaced by a barrier member 800 formed of a material having heat insulation or fire resistance or a material having thermal conductivity.

[0210] In this way, the first partition body 610a and the second partition body 610b can be formed of a material that is heat-insulating or fire-resistant or a material that is thermally conductive, and the blocking member 800 can work together to perform the function of the partition body 610.

[0211] As an example, the barrier member 800, which is integrally formed or connected with the first separator member 600a, can contact the first battery cell 111, and the barrier member 800, which is integrally formed or connected with the second separator member 600b, can contact the second battery cell 112.

[0212] As an example, a blocking member 800 integrally formed or connected with the first separating member 600a may contact the first battery cell 111, and a blocking member 800 integrally formed or connected with the second separating member 600b may contact the second battery cell 112, and a cooling plate 850 may be disposed between a pair of adjacent blocking members 800.

[0213] As an example, a blocking member 800 integrally formed or connected with the first separating member 600a may contact the first battery cell 111, and a blocking member 800 integrally formed or connected with the second separating member 600b may contact the second battery cell 112, and a surface pressure member 860 may be disposed between the pair of battery cells 110 that do not contact the blocking member 800.

[0214] According to one embodiment of the present disclosure, the separator 610 may be formed of a material having heat insulation or fire resistance or a material having thermal conductivity, and a barrier member 800 may be used together with the separator 600, the barrier member 800 contacting i) at least one of the pair of battery cells 110 separated by the separator 600.

[0215] The barrier member 800 may be formed of a material that is heat-insulating or fire-resistant, or a material that is thermally conductive.

[0216] Furthermore, according to one embodiment of this disclosure, the cooling plate 850 can be used in conjunction with the partition member 600, the cooling plate 850 being disposed between a pair of adjacent blocking members 800.

[0217] The cooling plate 850 may be formed of a material with thermal conductivity. Alternatively, the cooling plate 850 may be formed of a material with heat dissipation properties. For example, the cooling plate 850 may be formed of aluminum.

[0218] Furthermore, according to one embodiment of this disclosure, the surface pressure member 860 can be used together with the separator member 600, the surface pressure member 860 being disposed between the pair of battery cells 110 without contacting the blocking member 800.

[0219] As mentioned above, selective use of, for example Figure 10 , Figure 11 and Figure 12 The arrangement of the blocking member 800, cooling plate 850 or surface pressure member 860 shown.

[0220] Figure 13This is a longitudinal sectional view of a battery cell stack for illustrating a support member, according to another embodiment of the present disclosure.

[0221] Figure 13 This is a longitudinal sectional view of a battery cell stack according to another embodiment of the present disclosure.

[0222] Reference Figure 13 100 stacked battery cells (see) Figure 1 It may include a plurality of battery cells 110 stacked along the width direction, and a support member 1000-1 disposed between the battery cell 110 located at one end of the width direction and the end plate 400.

[0223] Support member 1000-1 may have the same Figure 3 The support member 1000 shown has a different shape. As an example, the support member 1000-1 may include a support partition body 1010 and a support cover 1020, which is different from the support member 1000 that only has a support partition body 1010.

[0224] Figure 3 The support member 1000 shown and Figure 13 The support members 1000-1 shown can be arranged parallel to the first cover 620a or the second cover 620b. In addition, both support members 1000 and support members 1000-1 can cover one side of the battery cell 110 located at one end in the width direction among the plurality of battery cells 110.

[0225] The supporting partition body 1010 can be disposed between the battery cell 110 located at one end in the width direction and the end plate 400 among the plurality of battery cells 110. The supporting partition body 1010 can extend in the height direction.

[0226] The support cover 1020 can extend from the support partition body 1010 to the cover 620. The support partition body 1010 and the support cover 1020 can be integrally formed.

[0227] The supporting partition body 1010 can cover one surface of the battery cell 110 located at one end in the width direction of the plurality of battery cells 110 facing the width direction.

[0228] The support cover 1020 can be arranged parallel to the cover 620 and can cover one surface of the battery cell 110 located at one end in the width direction, facing the battery cell 110 in the height direction (Z direction). The support separator 1010 and the support cover 1020 can be formed in an "L" shape.

[0229] Figure 3 The support member 1000 shown and Figure 13The support member 1000-1 shown can be used appropriately according to the number of battery cells 110.

[0230] As an example, when the battery cell 110 located at one end of the width direction among the plurality of battery cells 110 is covered by the partition member 600, the support member 1000 can be used, and when the battery cell 110 located at one end of the width direction among the plurality of battery cells 110 is not covered by the partition member 600, the support member 1000-1 can be used.

[0231] Figure 14 This is a perspective view of a pair of separating members and a battery cell disposed therebetween, according to another embodiment of this disclosure. Figure 15 This is a front view of the separator and battery cell viewed from the length direction according to another embodiment of this disclosure. Figure 16 This is a side view of the separator and battery cell viewed from the width direction according to another embodiment of the present disclosure. Figure 17 This is a longitudinal sectional view of the separator and battery cell according to another embodiment of the present disclosure. Figure 18 This is a cross-sectional view of the separator and battery cell according to another embodiment of the present disclosure. Figure 19 This is a cross-sectional view of the separator and battery cell according to another embodiment of the present disclosure.

[0232] Reference Figure 14 , Figure 15 , Figure 16 , Figure 17 , Figure 18 and Figure 19 The plurality of battery cells 110 can be arranged along the width direction.

[0233] The separator 600-1 can separate the plurality of battery cells 110 stacked along the width direction. The separator 600-1 can accommodate the plurality of battery cells 110 in separate spaces separated along the width direction.

[0234] A separator 600-1 may be disposed between a pair of battery cells 110 in the plurality of battery cells 110 to separate the pair of battery cells 110. The plurality of battery cells 110 may be stacked between a pair of adjacent separators 600.

[0235] Figure 14 The illustration shows two battery cells 110 stacked between a pair of adjacent separators 600-1, but the number of battery cells 110 disposed between the pair of adjacent separators 600-1 is not limited thereto.

[0236] The partition member 600-1 may further include a partition body 610-1, a cover 620-1, an end cover 630-1, a guide cover 640-1, and a connecting body 650-1.

[0237] The separating body 610-1, the cover 620-1, the end cover 630-1, the guide cover 640-1, and the connecting body 650-1 can be formed integrally.

[0238] The separator 610-1 and the cover 620-1 can extend along the length of the battery cell 110.

[0239] The separator 610-1 can be disposed between the pair of battery cells 110 separated by the separator 600-1, and can extend along the height direction.

[0240] The cover 620-1 extends from the separating body 610-1 to opposite sides in the width direction to jointly cover the surface of the pair of battery cells 110 facing the height direction (Z direction). The cover 620-1 extends from opposite ends of the separating body 610-1 to opposite sides in the width direction and jointly covers the surface of the pair of battery cells 110.

[0241] The cover 620-1 may include a cover vent 625 formed in the region facing the pair of battery cells 110 separated by the separator body 610 (see Figure 50 ), or a cover cutout portion 624 formed in the region facing the pair of battery cells 110 separated by the separator body 610 and having a cutout shape or a thickness less than the thickness of the surrounding region (see Figure 6 ).

[0242] The cover ventilation hole 625 or the cover cutout portion 624 may be used to discharge foreign objects or high-pressure fluids caused by the fire into the battery cell stack 100 in the event of a fire in the battery cell 110 (see [link]). Figure 1 ) External holes.

[0243] The end cover 630-1 may extend from the cover 620-1 to the opposite side in the height direction (opposite direction in the Z direction) to cover at least a portion of the pair of battery cells 110 on one side in the length direction of the pair of battery cells 110.

[0244] In other words, the cover 620-1 can cover the opposite surfaces of the battery cell 110 in the height direction, and the end cover 630-1 can cover at least a portion of one surface of the battery cell 110 in the length direction.

[0245] The guide cover 640-1 may be disposed parallel to the end cover 630 to cover at least a portion of the pair of battery cells 110 on one side of the battery cell 110 in the longitudinal direction.

[0246] The end cap 630-1 and the guide cap 640-1 can together cover the opposite end regions of the pair of battery cells 110 in the height direction on one side of the length direction.

[0247] The end caps 630-1 of the pair of adjacent separating members 600-1 may overlap each other, and the guide caps 640-1 of the pair of adjacent separating members 600-1 may also overlap each other.

[0248] The pair of end caps 630-1 and the pair of guide caps 640-1 may have a structure to prevent foreign objects or high-pressure fluid generated from the battery cell 110 in the fire from being introduced through one side of the battery cell 110 in the length direction.

[0249] The thickness of the end cover 630-1 in the height direction and the thickness of the guide cover 640-1 in the height direction can be greater than the thickness of the cover 620-1 in the height direction.

[0250] According to the structure of the pair of end caps 630-1 and the pair of guide caps 640-1, even if pressure is applied to the pair of end caps 630-1 and the pair of guide caps 640-1 due to the expansion in the battery cell 110, the relative position of the pair of end caps 630-1 and the pair of guide caps 640-1 will not change, and the separating member 600-1 will not deform.

[0251] In this way, the pair of end caps 630-1 and the pair of guide caps 640-1 will not deform even under pressure, and can firmly maintain the isolation structure between the battery cells 110. Therefore, even if the battery cell 110 catches fire, the isolation structure of the battery cell 110 can be maintained, and the thermoelectric conversion between the battery cells 110 can be delayed.

[0252] The connecting body 650-1 may be a portion of the connecting end cover 630-1 and the guide cover 640-1, and may extend from the end cover 630-1 to the guide cover 640-1. The thickness of the connecting body 650-1 in the width direction may be greater than the thickness of the separating body 610-1 in the width direction.

[0253] In another embodiment of this disclosure, the connecting body 650-1 of the separator 600-1 may protrude from the separator 610-1 toward opposite sides in the width direction. The connecting body 650-1 may protrude from the separator 610-1 toward the pair of battery cells 110 separated by the separator 600-1.

[0254] According to the structure of the connecting body 650-1, even if the battery cell 110 expands and pressure is applied to the connecting body 650-1, the relative position of the pair of connecting bodies 650-1 will not change, and the separating member 600 will not deform, thus providing a stable isolation structure. Therefore, even if a fire occurs in the battery cell 110, the isolation structure of the multiple battery cells 110 can be maintained, and the thermoelectric conversion between the battery cells 110 can be delayed.

[0255] Each battery cell 110 may include a first battery cell 111 and a second battery cell 112 that are adjacent to each other. In this case, any one of the plurality of separators 600-1 can be defined as a configuration disposed between the pair of battery cells 110 including the first battery cell 111 and the second battery cell 112.

[0256] According to another embodiment of the present disclosure, the connecting body 650-1 of the separating member 600-1 may protrude from the separating body 610-1 to the opposite side in the width direction, so as to jointly cover the side surfaces of the first battery cell 111 and the second battery cell 112 in the length direction.

[0257] The first battery cell 111 may include a battery cell stack 100 (see...) Figure 1 The first cell lead portion 111a extends to opposite sides in the length direction of the cell stack 100, and the second cell 112 may include a second cell lead portion 112a extending to opposite sides in the length direction of the cell stack 100.

[0258] The connecting body 650-1 can protrude from the separating body 610-1 toward the first monomer lead portion 111a and the second monomer lead portion 112a. The connecting body 650-1 can be spaced apart from the first monomer lead portion 111a and the second monomer lead portion 112a.

[0259] The connecting body 650-1 can also be set on the opposite side of the separating body 610-1 relative to the length direction.

[0260] like Figure 18 and Figure 19 As shown, the connecting body 650-1, together with the end cover 630-1 and the guide cover 640-1, can cover a portion of the opposite surface of the first battery cell 111 in the longitudinal direction, excluding the area where the first cell lead portion 111a is provided, and a portion of the opposite surface of the second battery cell 112 in the longitudinal direction, excluding the area where the second cell lead portion 112a is provided.

[0261] The connecting body 650-1 can be spaced apart from both the first cell lead portion 111a and the second cell lead portion 112a. With this structure, the connecting body 650-1 can cover a portion of the opposing surfaces of the battery cell 110 in the longitudinal direction, excluding the first cell lead portion 111a and the second cell lead portion 112a, while connecting the cell lead portions 111a and 112a to the sensing assembly 510.

[0262] In one aspect of the battery cell 110, the opposing surfaces of the battery cell 110 in the height direction may be made of thermal interface material 200 (see...). Figure 3 The battery cell 110 is covered by a cover 620-1, and one surface of the battery cell 110 in the width direction may be covered by a partition body 610-1, and the circumferential portion of the opposite surface of the battery cell 110 in the length direction may be covered by an end cover 630-1, a guide cover 640-1 and a connecting body 650-1.

[0263] With this structure, even if any of the plurality of battery cells 110 catches fire, the separation member 600-1 according to another embodiment of the present disclosure can delay the transfer of heat to the other battery cell 110 that has not caught fire due to the construction of the separation body 610-1.

[0264] Furthermore, according to another embodiment of this disclosure, the partition member 600-1 can cover at least a portion of the opposing sides of the plurality of battery cells 110 in the longitudinal direction. Therefore, even if any of the plurality of battery cells 110 catches fire, foreign objects or high-pressure fluids can be prevented from being introduced into the battery cell 110 through the area on one side of the other battery cell 110 in the longitudinal direction, excluding the cell lead portions 111a and 112a.

[0265] Furthermore, in the event of a fire in any of the plurality of battery cells 110, foreign matter or high-pressure fluid caused by the fire can be guided out of the battery cell stack 100 through the cover vent 625 or the cover cutout portion 624, and can be prevented from being introduced into another adjacent battery cell 110.

[0266] Furthermore, even if the battery cell 110 expands, it can prevent the end cover 630-1, guide cover 640-1 and connecting body 650-1 from changing position or deforming. Thus, even if the battery cell 110 catches fire, it can maintain a stable isolation structure between the multiple battery cells 110 and delay heat transfer between the multiple battery cells 110.

[0267] Figure 20This is a longitudinal sectional view of the separator, support member, battery cell and end plate according to another embodiment of the present disclosure.

[0268] According to another embodiment of the present disclosure, the battery cell stack 100 may include end plates 400 disposed on opposite sides of the plurality of battery cells 110 in the width direction, and support members 1000 disposed between the battery cells 110 located at both ends in the width direction and the end plates 400 among the plurality of battery cells 110.

[0269] The support member 1000 may cover one side of one of the plurality of battery cells 110 located at one end in the width direction. The support member 1000 may be a structure that only supports the partition body 1010.

[0270] Figure 21 It is based on this disclosure and Figure 20 A longitudinal sectional view illustrating the partition member, support member, battery cell, and end plate of another different embodiment.

[0271] Reference Figure 21 , Figure 21 The support member 1000-1 may have the same Figure 20 The supporting components have 1000 different shapes.

[0272] As an example, the support member 1000-1 may include a support partition body 1010 and a support cover 1020, which is different from the support member 1000 which only has a support partition body 1010.

[0273] Both support member 1000 and support member 1000-1 can be arranged parallel to the cover 620-1. In addition, both support member 1000 and support member 1000-1 can cover one side of the battery cell 110 located at one end in the width direction among the plurality of battery cells 110.

[0274] The supporting partition body 1010 can be disposed between the battery cell 110 located at one end in the width direction and the end plate 400 among the plurality of battery cells 110. The supporting partition body 1010 can extend in the height direction.

[0275] The support cover 1020 can extend from the support partition body 1010 to the cover 620-1. The support partition body 1010 and the support cover 1020 can be integrally formed.

[0276] The supporting partition body 1010 can cover one surface of the battery cell 110 located at one end in the width direction of the plurality of battery cells 110 facing the width direction.

[0277] The support cover 1020 may be arranged parallel to the cover 620-1 and cover one surface of the battery cell 110 located at one end in the width direction facing the height direction. The support partition body 1010 and the support cover 1020 may be formed in an "L" shape.

[0278] Figure 20 The support member 1000 shown and Figure 21 The support member 1000-1 shown can be used appropriately according to the number of battery cells 110.

[0279] As an example, when the battery cell 110 located at one end of the width direction among the plurality of battery cells 110 is covered by the partition member 600, the support member 1000 can be used, and when the battery cell 110 located at one end of the width direction among the plurality of battery cells 110 is not covered by the partition member 600, the support member 1000-1 can be used.

[0280] Figure 22 This is a longitudinal sectional view of the separator, battery cell, and barrier according to another embodiment of the present disclosure.

[0281] Reference Figure 22 The partition member 600-1 may include a first partition member 600a-1 and a second partition member 600b-1 disposed parallel to the first partition member 600a-1.

[0282] According to another embodiment of this disclosure, the battery cell stack 100 (see...) Figure 1 It may include a blocking member 800 that contacts at least one of the first separating member 600a-1 and the second separating member 600b-1.

[0283] The barrier member 800 may be formed of a material that is heat-insulating or fire-resistant, or a material that is thermally conductive.

[0284] The blocking member 800 may be disposed between at least one of the first battery cell 110 and the second battery cell 112 separated by the separating body 610-1 and the separating body 610-1.

[0285] The blocking member 800 may be disposed i) between the separator 600 and at least one of the pair of battery cells 110 separated by the separator 600, or ii) between the first separator 600a and the second separator 600b.

[0286] As an example, the blocking member 800 can be disposed between the separating body 610-1 and the first battery cell 111, and between the separating body 610-1 and the second battery cell 112. That is, each separating member 600 can be provided with two blocking members 800.

[0287] As an example, the blocking member 800 may be disposed only between the separator 610-1 and either of the first and second battery cells 111 and 112 separated by the separator 610-1. That is, each separator 600 may be provided with one blocking member 800.

[0288] As an example, the blocking member 800 may be disposed between the first separating member 600a-1 and the second separating member 600b-1.

[0289] The blocking member 800 can contact at least one of the first and second battery cells 111 and 112 separated by the separating member 600-1 to prevent the temperature of the first battery cell 111 or the second battery cell 112 from rising by improving thermal conductivity while ensuring fire resistance between the first battery cell 111 and the second battery cell 112.

[0290] Furthermore, although not shown separately in the accompanying drawings, the battery cell stack 100 may further include a cooling plate 850 disposed between the first separator 600a-1 and the second separator 600b-1.

[0291] A cooling plate 850 may be disposed between the first separating member 600a-1 and the second separating member 600b-1 to cool the first separating member 600a-1 and the second separating member 600b-1, or the first battery cell 111 and the second battery cell 112. Alternatively, the cooling plate 850 may be disposed between a pair of blocking members 800 disposed between the first separating member 600a-1 and the second separating member 600b-1.

[0292] The cooling plate 850 may be formed of a material with thermal conductivity. Alternatively, the cooling plate 850 may be formed of a material with heat dissipation properties. For example, the cooling plate 850 may be formed of aluminum.

[0293] Furthermore, although not shown separately in the accompanying drawings, at least a portion of the partition body 610-1 may be provided by the blocking member 800 (see...). Figure 10 Alternatively, a cooling plate 850 can be used instead.

[0294] In addition, instead of the blocking member 800 and the cooling plate 850, a surface pressure member 860 (see [link to surface pressure member]) can be used to apply surface pressure to the battery cell 110. Figure 12 ).

[0295] The blocking member 800 or cooling plate 850 can receive heat from the separating member 600 or battery cell 110 in contact with it, and exchange heat with the cooling channels formed inside the battery pack housing 1200 through the thermal interface material 200. Here, the cooling channel may refer to the channel through which cooling water flows.

[0296] Figure 23 This is a perspective view of the battery cell and the separator as viewed in the length direction according to another embodiment of this disclosure. Figure 24 This is a longitudinal sectional view of a battery cell and a separator according to yet another embodiment of the present disclosure. Figure 25 This is a cross-sectional view of a battery cell and a separator according to yet another embodiment of the present disclosure. Figure 26 This is a cross-sectional view of a battery cell and a separator according to yet another embodiment of the present disclosure.

[0297] Reference Figure 23 , Figure 24 , Figure 25 and Figure 26 According to another embodiment of this disclosure, the battery cell stack 100 (see...) Figure 1 It may include multiple battery cells 110 and separator components 600-2.

[0298] The plurality of battery cells 110 may be arranged along the width direction. The plurality of battery cells 110 may contact the thermal interface material 200.

[0299] Figure 23 The illustration shows two battery cells 110 stacked between a pair of adjacent separators 600-2, but the number of battery cells 110 disposed between the pair of adjacent separators 600-2 is not limited thereto.

[0300] The separator 600-2 can be disposed between the plurality of battery cells 110 and separate the plurality of battery cells 110. The separator 600-2 can accommodate the plurality of battery cells 110 in separate spaces separated along the width direction.

[0301] The partition member 600-2 may have a different shape than the partition member 600 according to one embodiment of the present disclosure.

[0302] The partition member 600-2 may include a partition body 610-2, a cover 620-2, an end cover 630-2, a guide cover 640-2, and a connecting body 650-2.

[0303] The dividing body 610-2, the cover 620-2, the end cover 630-2, the guide cover 640-2, and the connecting body 650-2 can be formed as a single unit.

[0304] The separator 610-2 can be disposed between a pair of battery cells 110 among the plurality of battery cells 110 and can extend along the height direction.

[0305] The cover 620-1 may extend from the separator 610-2 along one side in the width direction (X direction) to cover a surface of the first battery cell 111 of either of the pair of battery cells 110 separated by the separator 610-2, facing the height direction (Z direction). The cover 620-1 may extend from the opposite end of the separator 610-1 along one side in the width direction to cover one surface of the first battery cell 111.

[0306] More specifically, according to another embodiment of the present disclosure, the cover 620-2 of the separator 600-2 may together cover the first battery cell 111 of either of the pair of battery cells 110 separated by the separator body 610-2 and the second battery cell 112 disposed on the side opposite to the side facing the separator body 610-2 relative to the first battery cell 111.

[0307] One surface of the first battery cell 111 facing the height direction and one surface of the second battery cell 112 facing the height direction can be covered by the cover 620-2. The cover 620-2 can together cover the first battery cell 111 and the second battery cell 112.

[0308] The cover 620-2 may include a cover vent 625 formed in the region facing the first battery cell 111 or the second battery cell 112 (see Figure 50 ), or a cover cutout portion 624 formed in the region facing the first battery cell 111 or the second battery cell 112 and having a cutout shape or a thickness less than the thickness of the surrounding region (see Figure 6 ).

[0309] The cover ventilation hole 625 or the cover cutout portion 624 can be a hole for discharging foreign objects or high-pressure fluids caused by the fire to the outside of the battery cell stack 100 in the event of a fire in the battery cell 110 (see [link]). Figure 1 ).

[0310] The end cover 630-2 may extend from the cover 620-2 to the opposite side in the height direction (opposite direction in the Z direction) to jointly cover at least a portion of the first battery cell 111 and at least a portion of the second battery cell 112 on one side in the length direction of the first battery cell 111. The end cover 630-2 may protrude from the cover 620-2 to the opposite side in the height direction.

[0311] The guide cover 640-2 may be arranged parallel to the end cover 630-2 to cover at least a portion of the first battery cell 111 and at least a portion of the second battery cell 112 on one side of the first battery cell 111 in the length direction.

[0312] The pair of adjacent end caps 630-2 may overlap each other, and the pair of adjacent guide caps 640-2 may also overlap each other.

[0313] The thickness of the end cover 630-2 in the height direction and the thickness of the guide cover 640-2 in the height direction can be greater than the thickness of the cover 620-2 in the height direction.

[0314] Based on the structure of the pair of end caps 630-2 and the pair of guide caps 640-2, even if expansion occurs in the battery cell 110 and pressure is applied to the pair of end caps 630-2 and the pair of guide caps 640-2, the relative positions of the pair of end caps 630-2 and the pair of guide caps 640-2 will not change, and the separating member 600-2 will not deform, thus providing a robust isolation structure. Therefore, even if a fire occurs in the battery cell 110, the isolation structure of the battery cell 110 can be maintained, and heat transfer between the battery cells 110 can be delayed.

[0315] The connecting body 650-2 can connect the end cover 630-2 and the guide cover 640-2. The thickness of the connecting body 650-2 in the width direction can be greater than the thickness of the separating body 610-2 in the width direction.

[0316] According to the structure of the connecting body 650-2, even if the battery cell 110 expands and pressure is applied to the connecting body 650-2, the relative position of the pair of connecting bodies 650-2 will not change, and the separating member 600-2 will not deform, thus providing a stable isolation structure. Therefore, even if a fire occurs in the battery cell 110, the isolation structure of multiple battery cells 110 can be maintained, and the thermoelectric conversion between battery cells 110 can be delayed.

[0317] According to another embodiment of this disclosure, the connecting body 650-2 may be disposed between the separating body 610-2 and the end cover 630-2, and protrude from the separating body 610-2 toward the first battery cell 111. The connecting body 650-2 may further protrude from the separating body 610-2 toward the first battery cell 111 only on one side in the width direction.

[0318] The first battery cell 111 may include a first cell lead portion 111a extending to the opposite side in the length direction of the battery cell stack 100, and the second battery cell 112 may include a second cell lead portion 112a extending to the opposite side in the length direction of the battery cell stack 100.

[0319] The connecting body 650-2 can protrude from the separating body 610-2 toward the first cell lead portion 111a of the first cell 111. The connecting body 650-2 can be spaced apart from the first cell lead portion 111a and the second cell lead portion 112a.

[0320] With this structure, even if any of the plurality of battery cells 110 catches fire, the partition member 600-2 according to another embodiment of the present disclosure can delay the transfer of heat to the other battery cell 110 that has not caught fire due to the construction of the partition body 610-2.

[0321] Furthermore, according to another embodiment of this disclosure, the partition member 600-2 can cover at least a portion of one side of the plurality of battery cells 110 along its length. Therefore, even if any of the plurality of battery cells 110 catches fire, foreign objects or high-pressure fluid can be prevented from being introduced into the battery cell 110 through the area excluding the cell lead portions 111a and 112a from the side of the other battery cell 110 that has not caught fire.

[0322] Furthermore, in the event of a fire in any of the plurality of battery cells 110, foreign matter or high-pressure fluid caused by the fire can be guided out of the battery cell stack 100 through the cover vent 625 or the cover cutout portion 624, and can be prevented from being introduced into another adjacent battery cell 110.

[0323] Furthermore, even if the battery cell 110 expands, it can prevent the relative positions of the end cover 630-2, the guide cover 640-2 and the connecting body 650-2 from changing or deforming. Thus, even if the battery cell 110 catches fire, it can maintain a stable isolation structure between the multiple battery cells 110 and delay the heat transfer between the multiple battery cells 110.

[0324] Figure 27 This is a longitudinal sectional view of the partition member, support member, battery cell and end plate according to another embodiment of the present disclosure.

[0325] Reference Figure 27 According to another embodiment of this disclosure, the battery cell stack 100 (see...) Figure 1 It may further include end plates 400 disposed on opposite sides in the width direction of the plurality of battery cells 110, and support members 1000.

[0326] A pair of end plates 400 may be provided and may be arranged in parallel. The plurality of battery cells 110 may be arranged between the pair of end plates 400 along the width direction.

[0327] The support member 1000 may be disposed between the battery cell 110 located at one end in the width direction and the end plate 400 among the plurality of battery cells 110. The support member 1000 may cover one side of the battery cell 110 located at one end in the width direction among the plurality of battery cells 110.

[0328] The support member 1000 may cover one surface of the end plate 400 of one of the plurality of battery cells 110 located at one end in the width direction. The support member 1000 may consist only of a support partition body 1010.

[0329] Figure 28 This is based on the purpose of illustration and Figure 27 A longitudinal sectional view of the partition member, support member, battery cell and end plate of another different support member.

[0330] Reference Figure 28 , Figure 28 The support member 1000-1 may have the same Figure 22 The supporting components have 1000 different shapes.

[0331] Both support member 1000 and support member 1000-1 can be arranged parallel to the cover 620-2. In addition, both support member 1000 and support member 1000-1 can cover one side of the battery cell 110 located at one end in the width direction among the plurality of battery cells 110.

[0332] As an example, the support member 1000-1 may include a support partition body 1010 and a support cover 1020, which is different from the support member 1000 which only has a support partition body 1010.

[0333] The supporting partition body 1010 can be disposed between the battery cell 110 located at one end in the width direction and the end plate 400 among the plurality of battery cells 110. The supporting partition body 1010 can extend in the height direction.

[0334] The support cover 1020 can extend from the support partition body 1010 to the cover 620-1. The support partition body 1010 and the support cover 1020 can be integrally formed.

[0335] The supporting partition body 1010 can cover one surface of the battery cell 110 located at one end in the width direction of the plurality of battery cells 110 facing the width direction.

[0336] The support cover 1020 may be arranged parallel to the cover 620-2 and cover one surface of the battery cell 110 located at one end in the width direction facing the height direction. The support separator 1010 and the support cover 1020 may be formed in an "L" shape.

[0337] Figure 27 The support member 1000 shown and Figure 28 The support member 1000-1 shown can be used appropriately according to the number of battery cells 110.

[0338] As an example, when the battery cell 110 located at one end of the width direction among the plurality of battery cells 110 is covered by the partition member 600-2, the support member 1000 can be used, and when the battery cell 110 located at one end of the width direction among the plurality of battery cells 110 is not covered by the partition member 600-2, the support member 1000-1 can be used.

[0339] Figure 29 This is a longitudinal sectional view of the separator, battery cell, and blocking member according to another embodiment;

[0340] Reference Figure 29 The partition member 600-2 may include a first partition member 600a-2 and a second partition member 600b-2 disposed parallel to the first partition member 600a-2.

[0341] According to another embodiment of this disclosure, the battery cell stack 100 (see...) Figure 1 The device may include a blocking member 800, which i) contacts at least one of the first separating member 600a-2 and the second separating member 600b-2, and ii) contacts at least one of the first battery cell 111 and the second battery cell 112.

[0342] The barrier member 800 may be formed of a material that is heat-insulating or fire-resistant, or a material that is thermally conductive.

[0343] The blocking member 800 may be disposed between at least one of the first battery cell 110 and the second battery cell 112 separated by the separating body 610-2 and the separating body 610-2.

[0344] The blocking member 800 may be disposed i) between the separator 600-2 and at least one of the pair of battery cells 110 separated by the separator 600-2, or ii) between the first separator 600a-2 and the second separator 600b-2.

[0345] As an example, the blocking member 800 may be disposed between the first battery cell 111 and the second battery cell 112.

[0346] As an example, the blocking member 800 may be disposed between the separating body 610-2 and the first battery cell 111.

[0347] As an example, the blocking member 800 may be disposed between the first separating member 600a-2 and the second separating member 600b-2.

[0348] The blocking member 800 can contact at least one of the first and second battery cells 111 and 112 covered by the separating member 600-2 to prevent the temperature of the first battery cell 111 or the second battery cell 112 from rising by improving thermal conductivity while ensuring fire resistance between the first battery cell 111 and the second battery cell 112.

[0349] Furthermore, although not shown separately in the accompanying drawings, the battery cell stack 100 may further include a cooling plate 650 disposed between the first separator 600a-2 and the second separator 600b-2 (see Figure 100). Figure 10 ).

[0350] A cooling plate 850 may be disposed between the first separating member 600a-2 and the second separating member 600b-2 to cool the first separating member 600a-2 and the second separating member 600b-2, or the first battery cell 111 and the second battery cell 112. Alternatively, the cooling plate 850 may be disposed between a pair of blocking members 800 disposed between the first separating member 600a-2 and the second separating member 600b-2.

[0351] The cooling plate 850 may be formed of a material with thermal conductivity. Alternatively, the cooling plate 850 may be formed of a material with heat dissipation properties. For example, the cooling plate 850 may be formed of aluminum.

[0352] Furthermore, although not shown separately in the accompanying drawings, at least a portion of the partition body 610-2 may be provided by the blocking member 800 (see...). Figure 10 Alternatively, a cooling plate 850 can be used instead.

[0353] In addition, instead of the blocking member 800 and the cooling plate 850, a surface pressure member 860 (see [link to surface pressure member]) can be used to apply surface pressure to the battery cell 110. Figure 12 ).

[0354] The blocking member 800 or cooling plate 850 can receive heat from the separating member 600 or battery cell 110 in contact with it, and exchange heat with the cooling channels formed inside the battery pack housing 1200 through the thermal interface material 200. Here, the cooling channel may refer to the channel through which cooling water flows.

[0355] Figure 30This is a longitudinal sectional view of the separator, battery cell, and support member according to another embodiment.

[0356] Reference Figure 30 According to another embodiment of this disclosure, the battery cell stack 100 (see...) Figure 1 It may include multiple battery cells 110 and separator components 600-3.

[0357] The plurality of battery cells 110 may be arranged along the width direction. The plurality of battery cells 110 may contact the thermal interface material 200 (see... Figure 3 ).

[0358] The separator 600-3 can be disposed between the plurality of battery cells 110 and separate the plurality of battery cells 110. The separator 600-3 can accommodate the plurality of battery cells 110 in separate spaces separated along the width direction.

[0359] The partition member 600-3 may have a different shape than the partition members 600, 600-1 and 600-2 according to various embodiments of the present disclosure.

[0360] Figure 30 Two battery cells 110 are shown stacked between a pair of adjacent separators 600-3, but the number of battery cells 110 disposed between the pair of adjacent separators 600-3 is not limited thereto.

[0361] The partition member 600-3 may include a partition body 610-3, a cover 620-3, an end cover, a guide cover, and a connecting body, and may further include a support body 660-3. The partition member 600-3 may also be integrally formed.

[0362] Here, the descriptions of the partition members 600, 600-1 and 600-2 can be applied to the same structure of the partition member 600-3, such as the end cap, guide cap and connecting body.

[0363] The separator 610-3 can be disposed between a pair of battery cells 110 among a plurality of battery cells 110 and can extend along the height direction.

[0364] The plurality of battery cells 110 may include a first battery cell 111 of any one of a pair of battery cells 110 separated by a separator 600-3, and a second battery cell 112 disposed on the side opposite to the side facing the separator 610-3 relative to the first battery cell 111.

[0365] The cover 620-3 extends from the separating body 610-3 along its width (X direction) to cover a surface of either the first battery cell 111 of a pair of battery cells 110 separated by the separating body 610-3, facing the height direction. The cover 620-3 extends from one end of the separating body 610-3 along its width. The cover 620-3 extends to collectively cover a surface of the first battery cell 111 facing the height direction and a surface of the second battery cell 112 facing the height direction.

[0366] The cover 620-3 may include a cover vent 625 formed in the region facing the first battery cell 111 or the region facing the second battery cell 112 (see Figure 50 ), or a cover cutout portion 624 formed on the region facing the first battery cell 111 or the second battery cell 112 and having a cutout shape or a thickness less than the thickness of the surrounding region (see Figure 6 ).

[0367] The support 660-3 extends from the partition body 610-3 parallel to the cover 620-3 to cover the opposite surface of the first battery cell 111 facing the height direction (opposite to the Z direction). The support 660-3 extends from the partition body 610-3 to one side in the width direction (X direction) parallel to the cover 620-3. The support 660-3 extends from the opposite end of the partition body 610-3 in the height direction and covers the opposite surface of the first battery cell 111. The support 660-3 together cover the opposite surfaces of the first battery cell 111 and the second battery cell 112 facing the height direction.

[0368] The support 660-3 can be disposed between the first battery cell 111 and the thermal interface material 200 and between the second battery cell 112 and the thermal interface material 200.

[0369] In other words, for the first battery cell 111 and the second battery cell 112, the cover 620-3 can be set on one side in the height direction, and the support 660-3 can be set on the opposite side in the height direction.

[0370] although Figure 30 Not shown separately, the end cap may extend from the cap 620-3 toward the support 660-3 to jointly cover at least a portion of the first battery cell 111 and at least a portion of the second battery cell 112 on one side of the length direction of the first battery cell 111.

[0371] The guide cover may also extend from the support 660-3 toward the cover 620-3 to jointly cover at least a portion of the first battery cell 111 and at least a portion of the second battery cell 112 on one side of the length direction of the first battery cell 111.

[0372] A pair of adjacent end caps may overlap each other, and a pair of adjacent guide caps may also overlap each other.

[0373] Based on the structure of the pair of end caps and the pair of guide caps, even if the battery cell 110 expands and pressure is applied to the pair of end caps and the pair of guide caps, the relative positions of the pair of end caps and the pair of guide caps will not change, and the separating member 600-3 will not deform, thus providing a robust isolation structure. Therefore, even if a fire occurs in the battery cell 110, the isolation structure between the multiple battery cells 110 can be maintained, and thermoelectric transfer between the battery cells 110 can be delayed.

[0374] The connecting body can also connect the end cover and the guide cover, and its thickness in the width direction can be greater than the thickness of the separating body 610-3.

[0375] According to the structure of the connecting body, even if pressure is applied to the connecting body due to the expansion of the battery cell 110, the relative position of the pair of connecting bodies will not change, and the separating member 600-3 will not deform, thus having a robust isolation structure. Therefore, even if a fire occurs in the battery cell 110, the isolation structure between the multiple battery cells 110 can be maintained, and the thermoelectric conversion between the battery cells 110 can be delayed.

[0376] Similarly, although not shown separately in the figures, the first battery cell 111 may include a first cell lead portion 111a extending toward the opposite side in the longitudinal direction of the battery cell stack 100 (see figure). Figure 26 The second battery cell 112 may include a second cell lead portion 112a extending toward the opposite side of the length direction of the battery cell stack 100.

[0377] The connecting body may protrude from the separating body 610-3 to one side in the width direction. The connecting body may protrude from the separating body 610-3 toward the first cell lead portion 111a of the first cell 111. The connecting body may be spaced apart from the first cell lead portion 111a and the second cell lead portion 112a.

[0378] With this structure, even if any one of the multiple battery cells 110 catches fire, the partition member 600-3 according to another embodiment of the present disclosure can delay the transfer of heat to the other battery cell 110 that has not caught fire due to the construction of the partition body 610-3.

[0379] Furthermore, according to another embodiment of this disclosure, the partition member 600-3 may also cover at least a portion of the plurality of battery cells 110 on opposite sides in the longitudinal direction. Therefore, even if any one of the plurality of battery cells 110 catches fire, foreign objects or high-pressure fluids can be prevented from entering the battery cell 110 through the area on one side of the other battery cell 110 in the longitudinal direction, excluding the cell lead portions 111a and 112a.

[0380] In addition, even if the battery cell 110 expands, the position of the end cover, guide cover and connecting body can be prevented from changing or deforming, thereby maintaining a robust isolation structure between multiple battery cells 110, and even if the battery cell 110 catches fire, the heat transfer between multiple battery cells 110 can be delayed.

[0381] According to another embodiment of this disclosure, the battery cell stack 100 (see...) Figure 1 It may further include end plates 400 and support members 1000 disposed on opposite sides of the plurality of battery cells 110 in the width direction.

[0382] A pair of endplates 400 can be provided (see) Figure 2 They can be arranged parallel to each other. Multiple battery cells 110 can be arranged between the opposite end plates 400 in the width direction.

[0383] The support member 1000 can be disposed between the battery cell 110 located at one end in the width direction and the end plate 400 among the plurality of battery cells 110. The support member 1000 can cover one side of the battery cell 110 located at one end in the width direction among the plurality of battery cells 110.

[0384] The support member 1000 can cover one surface of the end plate 400 of one of the multiple battery cells 110 located at one end in the width direction.

[0385] Figure 31 It is used to explain and Figure 30 The longitudinal sectional views of the different support components, the separators, the battery cells, and the support components.

[0386] Reference Figure 31 The support member 1000-1 may have a different shape than the support member 1000. For example, unlike the support member 1000 which only has a support partition body 1010, the support member 1000-1 may include a support partition body 1010, a first support cover 1030 and a second support cover 1040.

[0387] Both support member 1000 and support member 1000-1 can be arranged parallel to the cover 620-3. In addition, both support member 1000 and support member 1000-1 can cover one side of the battery cell 110 located at one end relative to the width direction among the plurality of battery cells 110.

[0388] The supporting partition body 1010 can be disposed between the battery cell 110 located at one end in the width direction and the end plate 400 among a plurality of battery cells 110. The supporting partition body 1010 can extend in the height direction.

[0389] The first support cover 1030 may extend from the support partition body 1010 toward the cover 620-3. Although the first support cover 1030 is shown in the drawings extending from one end of the support partition body 1010 in the height direction toward the cover 620-3, this disclosure is not limited thereto.

[0390] The second support cover 1040 may extend from the support partition body 1010 toward the support body 660-3. Although the accompanying drawings show the second support cover 1040 extending from the opposite end of the support partition body 1010 toward the cover body 620-3 in the height direction, this disclosure is not limited thereto.

[0391] The supporting partition body 1010 can cover one surface of the battery cell 110 located at one end in the width direction among a plurality of battery cells 110 that faces the width direction.

[0392] The first support cover 1030 can be arranged parallel to the cover 620-3 and can cover one surface of the battery cell 110 located at one end in the width direction facing the height direction.

[0393] The second support cover 1040 can be arranged parallel to the support body 660-3 and can cover the opposite surface of the battery cell 110 located at one end in the width direction, facing the opposite side in the height direction.

[0394] The supporting partition body 1010, the first supporting cover 1030, and the second supporting cover 1040 can be integrally formed.

[0395] Support member 1000 and support member 1000-1 can be used appropriately according to the number of battery cells 110. One support member 1000-1 can be used, or two support members can be used.

[0396] For example, when a battery cell 110 located at one end of the width direction among a plurality of battery cells 110 is covered by a separating member 600-3, a supporting member 1000 can be used; when a battery cell 110 located at one end of the width direction among a plurality of battery cells 110 is not covered by a separating member 600-3, a supporting member 1000-1 can be used.

[0397] Although not shown separately in the accompanying drawings, according to another embodiment of this disclosure, the battery cell stack 100 (see...) Figure 1 ) may include a blocking member 800 (see Figure 29 ).

[0398] The separator 600-3 may include a first separator 600-3 that together covers the first battery cell 111 and the second battery cell 112, and a second separator 600-3 disposed parallel to the first separator 600-3.

[0399] According to another embodiment of the present disclosure, the battery cell stack 100 may include a blocking member 800, which i) contacts at least one of the first separator 600a-3 and the second separator 600b-3, and ii) contacts at least one of the first battery cell 111 and the second battery cell 112.

[0400] The barrier member 800 may be formed of a material that is heat-insulating or fire-resistant, or a material that is thermally conductive.

[0401] The blocking member 800 can be disposed between the first battery cell 111 and the separating body 610-3, which are separated by the separating body 610-3.

[0402] The blocking member 800 may be disposed between i) the separator 600-3 and at least one of a pair of battery cells 110 separated by the separator 600-3, or ii) between the first separator 600a-3 and the second separator 600b-3.

[0403] As an example, the blocking member 800 may be disposed between the first battery cell 111 and the second battery cell 112.

[0404] As an example, the blocking member 800 may be disposed between the separating body 610-3 and the first battery cell 111.

[0405] As an example, the blocking member 800 may be disposed between the first separating member 600-3 and the second separating member 600-3.

[0406] The barrier member 800 can contact at least one of the first and second battery cells 111 and 112 covered by the separator member 600-3 to prevent the temperature of the first battery cell 111 or the second battery cell 112 from rising by improving thermal conductivity while ensuring fire resistance between the first battery cell 111 and the second battery cell 112.

[0407] Furthermore, although not shown separately in the accompanying drawings, the battery cell stack 100 may further include a cooling plate 650 disposed between the first separator 600-3 and the second separator 600-3 (see figure). Figure 10 ).

[0408] A cooling plate 850 may be disposed between the first partition member 600-3 and the second partition member 600-3 to cool the first partition member 600-3 and the second partition member 600-3, or the first battery cell 111 and the second battery cell 112. The cooling plate 850 may also be disposed between a pair of blocking members 800 disposed between the first partition member 600 and the second partition member 600-3.

[0409] The cooling plate 850 may be formed of a material with thermal conductivity. The cooling plate 850 may also be formed of a material with heat dissipation properties. For example, the cooling plate 850 may be formed of aluminum.

[0410] Furthermore, although not shown separately in the accompanying drawings, at least a portion of the partition body 610-3 may be provided by the blocking member 800 (see...). Figure 10 Alternatively, a cooling plate 850 can be used instead.

[0411] In addition, instead of the blocking member 800 and the cooling plate 850, a surface pressure member 860 (see [link to surface pressure member]) can be used to apply surface pressure to the battery cell 110. Figure 12 ).

[0412] The blocking member 800 or cooling plate 850 can receive heat from the contacting separating member 600 or battery cell 110, and exchange heat with the cooling channels formed inside the battery pack housing 1200 through the thermal interface material 200. Here, the cooling channel may refer to the channel through which cooling water flows.

[0413] Figure 32 This is a longitudinal sectional view of the separator, battery cell, and support member according to yet another embodiment of the present disclosure.

[0414] Reference Figure 32 According to another embodiment of this disclosure, the battery cell stack 100 (see...) Figure 1 It may include multiple battery cells 110 and separator components 600-4.

[0415] Multiple battery cells 110 may be arranged along the width direction. Multiple battery cells 110 may contact the thermal interface material 200 (see...). Figure 3 ).

[0416] The separator 600-4 can be disposed between a pair of battery cells 110 among a plurality of battery cells 110 to separate the pair of battery cells 110. The separator 600-4 can accommodate the plurality of battery cells 110 in separate spaces separated along the width direction.

[0417] The partition member 600-4 may have a different shape than the partition members 600, 600-1, 600-2 and 600-3 according to various embodiments of the present disclosure.

[0418] Figure 32 Two battery cells 110 are shown stacked between a pair of adjacent separators 600-4, but the number of battery cells 110 disposed between the pair of adjacent separators 600-4 is not limited thereto.

[0419] The partition member 600-4 may include a partition body 610-4, a cover 620-4, an end cover, a guide cover, and a connecting body, and may further include a support body 660-4. The partition member 600-4 may also be integrally formed.

[0420] Here, the descriptions of the partition members 600, 600-1 and 600-2 can be applied to the same structure of the partition member 600-3, such as the end cap, guide cap and connecting body.

[0421] The separator 610-4 can be disposed between a pair of battery cells 110 among a plurality of battery cells 110 and can extend along the height direction.

[0422] The plurality of battery cells 110 may include a first battery cell 111 and a second battery cell 112 separated by a separator 610-4.

[0423] The cover 620-4 extends from the separating body 610-4 to the opposite side in the width direction to jointly cover the surface of a pair of battery cells 110 separated by the separating body 610-4 on the side facing the height direction (Z direction). The cover 620-4 extends from one end of the separating body 610-4 in the height direction to the opposite side in the width direction. The cover 620-4 extends to jointly cover one surface of the first battery cell 111 and one surface of the second battery cell 112.

[0424] The cover 620-4 may include a cover vent 625 formed in the region facing the first battery cell 111 or the second battery cell 112 (see Figure 50 ), or a cover cutout portion 624 formed on the region facing the first battery cell 111 or the second battery cell 112 and having a cutout shape or a thickness less than the thickness of the surrounding region (see Figure 6 ).

[0425] The support 660-4 extends parallel to the cover 620-4 from the partition body 610-4 to cover the opposite surfaces of the pair of battery cells 110 facing opposite sides in the height direction (opposite to the Z direction) between the opposite sides of the pair of battery cells 110 in the height direction. The support 660-4 extends from the opposite ends of the partition body 610-4 in the height direction to the opposite sides in the width direction.

[0426] In other words, for the first battery cell 111 and the second battery cell 112, the cover 620-4 can be set on one side in the height direction, and the support 660-4 can be set on the opposite side in the height direction.

[0427] The partition member 600-4 can be formed in an "I" shape in the cross-section showing the partition body 610-4, the cover 620-4 and the support 660-4.

[0428] although Figure 32 Not shown separately, the end cap may extend from the cap 620-4 toward the support 660-4 to jointly cover at least a portion of the pair of battery cells 110 on one side of the pair of battery cells 110 in the length direction.

[0429] The guide cover may also extend from the support 660-4 toward the cover 620-4 to cover at least a portion of the pair of battery cells 110 on one side of the pair of battery cells 110 in the longitudinal direction.

[0430] A pair of adjacent end caps may overlap each other, and a pair of adjacent guide caps may also overlap each other.

[0431] Based on the structure of the end caps and guide caps, even if the battery cell 110 expands and pressure is applied to the end caps and guide caps, the position of the separating member 600-4 will not change, and the separating member 600-4 will not deform, thus providing a robust isolation structure. Therefore, even if a fire occurs in the battery cell 110, the isolation structure between the multiple battery cells 110 can be maintained, and thermoelectric transfer between the battery cells 110 can be delayed.

[0432] The connecting body can also connect the end cover and the guide cover, and its thickness in the width direction can be greater than the thickness of the separating body 610-4.

[0433] According to the structure of the connecting body, even if pressure is applied to the connecting body due to the expansion of the battery cell 110, the relative position of the pair of connecting bodies will not change, and the separating member 600-4 will not deform, thus having a robust isolation structure. Therefore, even if a fire occurs in the battery cell 110, the isolation structure of the multiple battery cells 110 can be maintained, and the thermoelectric conversion between the battery cells 110 can be delayed.

[0434] Similarly, although not shown separately in the figures, the first battery cell 111 may include a first cell lead portion 111a extending toward the opposite side in the longitudinal direction of the battery cell stack 100 (see figure). Figure 26 The second battery cell 112 may include a second cell lead portion 112a extending toward the opposite side of the length direction of the battery cell stack 100.

[0435] The connecting body may protrude from the separating body 610-4 to the opposite side in the width direction. The connecting body may protrude from the separating body 610-3 toward the first cell lead portion 111a of the first battery cell 111 and the second cell lead portion 112a of the second battery cell 112. The connecting body may be spaced apart from the first cell lead portion 111a and the second cell lead portion 112a.

[0436] With this structure, even if any one of the multiple battery cells 110 catches fire, the partition member 600-4 according to another embodiment of the present disclosure can delay the transfer of heat to the other battery cell 110 that has not caught fire due to the construction of the partition body 610-4.

[0437] Furthermore, according to another embodiment of this disclosure, the partition member 600-4 may also cover at least a portion of the plurality of battery cells 110 on opposite sides in the longitudinal direction. Therefore, even if any one of the plurality of battery cells 110 catches fire, foreign objects or high-pressure fluids can be prevented from entering the battery cell 110 through the area on one side of the other battery cell 110 in the longitudinal direction, excluding the cell lead portions 111a and 112a.

[0438] In addition, even if the battery cell 110 expands, the position of the end cover, guide cover and connecting body can be prevented from changing or deforming, so that even if the battery cell 110 catches fire, the robust isolation structure between the multiple battery cells 110 can be maintained and the heat transfer between the multiple battery cells 110 can be delayed.

[0439] According to another embodiment of this disclosure, the battery cell stack 100 may further include an end plate 400 and a support member 1000 disposed on one side of the width direction of the plurality of battery cells 110.

[0440] A pair of end plates 400 may be provided and may be arranged parallel to each other. Multiple battery cells 110 may be arranged between the pair of end plates 400 in the width direction.

[0441] The support member 1000 can be disposed between the battery cell 110 located at one end in the width direction and the end plate 400 among the plurality of battery cells 110. The support member 1000 can cover one side of the battery cell 110 located at one end in the width direction among the plurality of battery cells 110.

[0442] The support member 1000 can cover one surface of the end plate 400 of one of the multiple battery cells 110 located at one end in the width direction.

[0443] Figure 33 It is used to explain and Figure 32 The longitudinal sectional views of the different support components, the separators, the battery cells, and the support components.

[0444] Reference Figure 33 The support member 1000-1 may have a different shape than the support member 1000. For example, unlike the support member 1000 which only has a support partition body 1010, the support member 1000-1 may include a support partition body 1010, a first support cover 1030 and a second support cover 1040.

[0445] Both support member 1000 and support member 1000-1 can be arranged parallel to the cover 620-3. In addition, both support member 1000 and support member 1000-1 can cover one side of the battery cell 110 located at one end relative to the width direction among the plurality of battery cells 110.

[0446] The supporting partition body 1010 can be disposed between the battery cell 110 located at one end in the width direction and the end plate 400 among a plurality of battery cells 110. The supporting partition body 1010 can extend in the height direction.

[0447] The first support cover 1030 may extend from the support partition body 1010 toward the cover 620-4. Although the first support cover 1030 is shown in the drawings extending from one end of the support partition body 1010 in the height direction toward the cover 620-4, this disclosure is not limited thereto.

[0448] The second support cover 1040 may extend from one end of the support partition body 1010 toward the support body 660-4. Although the accompanying drawings show the second support cover 1040 extending from the opposite end of the support partition body 1010 toward the support body 660-4 in the height direction, this disclosure is not limited thereto.

[0449] The supporting partition body 1010 can cover one surface of the battery cell 110 located at one end in the width direction among a plurality of battery cells 110, facing the width direction.

[0450] The first support cover 1030 can be arranged parallel to the cover 620-4 and can cover one surface of the battery cell 110 located at one end in the width direction facing the height direction.

[0451] The second support cover 1040 can be arranged parallel to the support body 660-4 and can cover the opposite surface of the battery cell 110 located at one end in the width direction, facing the opposite side in the height direction.

[0452] The supporting partition body 1010, the first supporting cover 1030, and the second supporting cover 1040 can be integrally formed.

[0453] Support member 1000 and support member 1000-1 can be used appropriately according to the number of battery cells 110. One support member 1000-1 can be used, or two support members can be used.

[0454] As an example, when the battery cell 110 located at one end of the width direction among the plurality of battery cells 110 is covered by the partition member 600-4, the support member 1000 can be used; when the battery cell 110 located at one end of the width direction among the plurality of battery cells 110 is not covered by the partition member 600-4, the support member 1000-1 can be used.

[0455] Although not shown separately in the accompanying drawings, according to another embodiment of this disclosure, the battery cell stack 100 (see...) Figure 1 ) may include a blocking member 800 (see Figure 22 ).

[0456] The separator 600-4 may include a first separator 600-4 that together covers the first battery cell 111 and the second battery cell 112, and a second separator 600-4 disposed parallel to the first separator 600-4.

[0457] According to another embodiment of the present disclosure, the battery cell stack 100 may include a blocking member 800 that contacts at least one of the first separator 600-4 and the second separator 600-4.

[0458] The barrier member 800 may be formed of a material that is heat-insulating or fire-resistant, or a material that is thermally conductive.

[0459] The blocking member 800 may be disposed between at least one of the first battery cell 110 and the second battery cell 112 separated by the separating body 610-4 and the separating body 610-4.

[0460] The blocking member 800 may be disposed between i) the separator 600-4 and at least one of a pair of battery cells 110 separated by the separator 600-4, or ii) between the first separator 600-4 and the second separator 600-4.

[0461] As an example, the blocking member 800 can be disposed between the separator 610-4 and the first battery cell 111, and between the separator 610-4 and the second battery cell 112. That is, each separator 600 can be provided with two blocking members 800.

[0462] As an example, the blocking member 800 may be disposed only between the separator 610-4 and either the first or second battery cells 111 and 112 separated by the separator 610-4. That is, each separator 600 may be provided with one blocking member 800.

[0463] As an example, the blocking member 800 may be disposed between the first separating member 600-4 and the second separating member 600-4.

[0464] The blocking member 800 can contact at least one of the first and second battery cells 111 and 112 separated by the separating members 600-4 to prevent the temperature of the first battery cell 111 or the second battery cell 112 from rising by improving thermal conductivity while ensuring fire resistance between the first battery cell 111 and the second battery cell 112.

[0465] Furthermore, although not shown separately in the accompanying drawings, the battery cell stack 100 may further include a cooling plate 850 disposed between a pair of adjacent separating members 600-4 (see Figure 100). Figure 10 ).

[0466] A cooling plate 850 may be disposed between the pair of separating members 600-4 to cool the pair of separating members 600-4 or the first battery cell 111 and the second battery cell 112. The cooling plate 850 may also be disposed between a pair of blocking members 800 disposed between the pair of separating members 600-4.

[0467] The cooling plate 850 may be formed of a material with thermal conductivity. The cooling plate 850 may also be formed of a material with heat dissipation properties. For example, the cooling plate 850 may be formed of aluminum.

[0468] Furthermore, although not shown separately in the accompanying drawings, at least a portion of the partition body 610-4 may be provided by the blocking member 800 (see...). Figure 12 Alternatively, a cooling plate 850 can be used instead.

[0469] In addition, instead of the blocking member 800 and the cooling plate 850, a surface pressure member 860 (see [link to surface pressure member]) can be used to apply surface pressure to the battery cell 110. Figure 12 ).

[0470] The blocking member 800 or cooling plate 850 can receive heat from the contacting separating member 600 or battery cell 110, and exchange heat with the cooling channels formed inside the battery pack housing 1200 through the thermal interface material 200. Here, the cooling channel may refer to the channel through which cooling water flows.

[0471] Figure 34 This is a cross-sectional view of the separator, battery cell, and support member according to yet another embodiment.

[0472] Reference Figure 34 According to another embodiment of this disclosure, the battery cell stack 100 (see...) Figure 1 It may include multiple battery cells 110 and separators 600-5.

[0473] Multiple battery cells 110 can be arranged along the width direction. Multiple battery cells 110 can contact the thermal interface material 200.

[0474] Figure 34 Two battery cells 110 are shown stacked between a pair of adjacent separators 600-5, but the number of battery cells 110 disposed between the pair of adjacent separators 600-5 is not limited thereto.

[0475] The separator 600-5 can be disposed between a pair of battery cells 110 among a plurality of battery cells 110, and can separate the plurality of battery cells 110. The separator 600-5 can accommodate the plurality of battery cells 110 in separate spaces separated along the width direction.

[0476] The partition member 600-5 may have a different shape than the partition members 600, 600-1, 600-2, 600-3 and 600-4 according to various embodiments of the present disclosure.

[0477] The partition member 600-5 may include a first partition member 600a-5 and a second partition member 600b-5.

[0478] The first separating member 600a-5 may be disposed between the pair of battery cells 110 and may cover one and the opposite surfaces of any one of the first battery cells 111 in the pair of battery cells 110 facing the opposite side in the height direction.

[0479] The second separator 600b-5 may be disposed between another second battery cell 112 in the pair of battery cells 110 and the first separator 600a-5, and may cover one surface and the opposite surface of the second battery cell 112 facing the opposite side in the height direction.

[0480] The first partition member 600a-5 may include a first partition body 610a-5, a first cover 620a-5, a first end cover, a first guide cover, and a first connecting body, and may further include a first support body 660a-5. The first partition member 600a-5 may be integrally formed.

[0481] The second partition member 600b-5 may include a second partition body 610b-5, a second cover 620b-5, a second end cover, a second guide cover, and a second connecting body, and may further include a second support body 660b-5. The second partition member 600b-5 may be integrally formed.

[0482] The descriptions of the first end cover, the first guide cover, the first connecting body, the second end cover, the second guide cover, and the second connecting body, etc., can be applied to the description of the partition member 600 according to embodiments of the present disclosure.

[0483] The first separator 610a-5 can be disposed between the first battery cell 111 and the second separator 600b-5, and can extend along the height direction.

[0484] The first cover 620a-5 may extend from the first partition body 610a-5 to one side in the width direction (X direction) to cover a surface of the first battery cell 111 facing the height direction (Z direction). The first cover 620a-5 may extend from one end of the first partition body 610a-5 in the height direction to one side in the width direction.

[0485] The first support 660a-5 extends parallel to the first cover 620a-5 from the first partition body 610a-5 to cover the opposite surface of the first battery cell 111 facing the opposite side in the height direction. The first support 660a-5 extends from the opposite end of the first partition body 610a-5 in the height direction to one side in the width direction (X direction).

[0486] The second separator 610b-5 can be disposed between the second battery cell 112 and the first separator 610a-5, and can extend along the height direction.

[0487] The second cover 620b-5 may extend from the second partition body 610b to the opposite side in the width direction (opposite to the X direction) to cover a surface of the second battery cell 112 facing the height direction. The second cover 620b-5 may extend from one end of the second partition body 610b-5 in the height direction to the opposite side in the width direction.

[0488] The first cover 620a-5 and the second cover 620b-5 may extend in opposite directions from the first partition body 610a-5 and the second partition body 610b-5, respectively.

[0489] The first cover 620a-5 and the second cover 620b-5 can overlap each other. According to this structure, even if the battery cell 110 expands, and even if the first cover 620a-5 and the second cover 620b-5 are pressed by the battery cell 110, the first cover 620a-5 and the second cover 620b-5 can be prevented from separating in the width direction (the direction opposite to the X direction or the X direction) or the height direction (the direction opposite to the Z direction or the Z direction), thereby maintaining the isolation structure between the battery cells 110.

[0490] Therefore, even if the battery cell 110 expands, the isolation structure between the battery cells 110 in the battery cell stack 100 can be maintained, thereby maximizing the effect of delaying heat transfer between the battery cells 110.

[0491] The first cover 620a-5 or the second cover 620b-5 may include cover ventilation holes 625 formed in the region facing the first battery cell 111 or the region facing the second battery cell 112 (see Figure 50 ), or a cover cutout portion 624 formed on the region facing the first battery cell 111 or the region facing the second battery cell 112 and having a cutout shape or a thickness less than the thickness of the surrounding region (see Figure 6 ).

[0492] The second support 660b-5 extends parallel to the second cover 620b-5 from the second partition body 610b-5 to cover the opposite surface of the second battery cell 112 on the opposite side in the height direction. The second support 660b-5 extends from the opposite end of the second partition body 610b-5 in the height direction to the opposite side in the width direction (opposite to the X direction).

[0493] The first support 660a-5 and the second support 660b-5 can extend in opposite directions from the first partition body 610a-5 and the second partition body 610b-5, respectively.

[0494] The first support 660a-5 and the second support 660b-5 can overlap each other. According to this structure, even if the battery cell 110 expands, and even if the first support 660a-5 and the second support 660b-5 are pressed by the battery cell 110, separation of the first support 660a-5 and the second support 660b-5 in the width direction (opposite to the X direction or the X direction) or the height direction (opposite to the Z direction or the Z direction) can be prevented, thereby maintaining the isolation structure between the battery cells 110.

[0495] Therefore, even if the battery cell 110 expands, the isolation structure between the battery cells 110 in the battery cell stack 100 can be maintained, thereby maximizing the effect of delaying heat transfer between the battery cells 110.

[0496] That is, the first cover 620a-5 and the first support 660a-5 can be disposed on opposite sides of the first battery cell 111 in the height direction, and the second cover 620b-5 and the second support 660b-5 can be disposed on opposite sides of the second battery cell 112 in the height direction.

[0497] although Figure 34 Not shown separately, the first end cover may extend from the first cover 620a-5 toward the first support 660a-5 to cover at least a portion of the first battery cell 111 on one side of the first battery cell 111 in the length direction.

[0498] The first guide cover may also extend from the first support 660a-5 toward the first cover 620a-5 to cover at least a portion of the first battery cell 111 on one side of the first battery cell 111 in the length direction.

[0499] The first connecting body can connect the first end cover and the first guide cover, and its thickness in the width direction can be greater than the thickness of the first separating body 610a-5.

[0500] The second end cover may extend from the second cover 620b-5 toward the second support 660b-5 to cover at least a portion of the second battery cell 112 on one side in the length direction of the second battery cell 112.

[0501] The second guide cover may extend from the second support 660b-5 toward the second cover 620b-5 to cover at least a portion of the second battery cell 112 on one side in the length direction of the second battery cell 112.

[0502] The second connecting body can connect to the second end cover and the second guide cover, and its thickness in the width direction can be greater than the thickness of the second separating body 610b-5.

[0503] The first end cover and the second end cover can contact each other, and the first guide cover and the second guide cover can contact each other.

[0504] The first end cover and the second end cover can overlap each other, and the first guide cover and the second guide cover can overlap each other.

[0505] As described below, the first end cover and the second end cover can be connected to each other, and the first guide cover and the second guide cover can be connected to each other.

[0506] The thickness of the first end cover in the height direction and the thickness of the first guide cover in the height direction can be greater than the thickness of the first cover 620a-5 in the height direction, and the thickness of the second end cover in the height direction and the thickness of the second guide cover in the height direction can be greater than the thickness of the second cover 620b-5.

[0507] According to this structure, the first separating body 610a-5 and the second separating body 610b-5 can isolate the first battery cell 111 from the second battery cell 112, the first cover 620a-5 can cover one side of the first battery cell 111 in the height direction (Z direction), and the second cover 620b-5 can cover one side of the second battery cell 112 in the height direction (Z direction).

[0508] Furthermore, based on the structure of the first and second end covers, the first and second guide covers, and the second guide cover, even if pressure is applied to the first and second end covers due to expansion within the battery cell 110, the relative positions of the first and second end covers, the first and second guide covers, and the separating member 600-5 will not change or deform. Therefore, even if a fire occurs in the battery cell 110, the robust isolation structure of the multiple battery cells 110 can be maintained, and heat transfer between the battery cells 110 can be delayed.

[0509] Based on the structure of the first and second connecting bodies, even if the battery cell 110 expands and pressure is applied to the first and second connecting bodies, the relative positions of the first and second connecting bodies will not change, and no deformation will occur in the separator 600-5, thereby maintaining a robust isolation structure. Therefore, heat transfer between the battery cells 110 can be delayed.

[0510] Similarly, although not shown separately in the figures, the first battery cell 111 may include a first cell lead portion 111a extending toward the opposite side in the longitudinal direction of the battery cell stack 100 (see figure). Figure 26 The second battery cell 112 may include a second cell lead portion 112a extending toward the opposite side of the length direction of the battery cell stack 100.

[0511] The first connecting body can protrude from the first separating body 610a-5 toward the first single-unit lead portion 111a, and the second connecting body can protrude from the second separating body 610b-5 toward the second single-unit lead portion 112a.

[0512] The first connecting body may be spaced apart from the first single-unit lead portion 111a, and the second connecting body may be spaced apart from the second single-unit lead portion 112a.

[0513] With this structure, even if any one of the multiple battery cells 110 catches fire, the partition member 600-5 according to another embodiment of the present disclosure can delay the transfer of heat to the other battery cell 110 that has not caught fire due to the construction of the first partition body 610a-5 and the second partition body 610b-5.

[0514] Furthermore, according to another embodiment of this disclosure, the partition member 600-5 may also cover at least a portion of the plurality of battery cells 110 on opposite sides in the longitudinal direction. Therefore, even if any one of the plurality of battery cells 110 catches fire, foreign objects or high-pressure fluids can be prevented from entering the battery cell 110 through the area on one side of the other battery cell 110 in the longitudinal direction, excluding the cell lead portions 111a and 112a.

[0515] In addition, even if the battery cell 110 expands, it can prevent the end cover, guide cover and connecting body from changing position or deforming, thereby providing a robust isolation structure between multiple battery cells 110 and delaying heat transfer between multiple battery cells 110.

[0516] According to another embodiment of this disclosure, the battery cell stack 100 (see...) Figure 1 It may further include an end plate 400 and a support member 1000 disposed on one side of the plurality of battery cells 110 in the width direction.

[0517] A pair of end plates 400 may be provided and may be arranged parallel to each other. Multiple battery cells 110 may be arranged between the pair of end plates 400 in the width direction.

[0518] The support member 1000 can be disposed between the battery cell 110 located at one end in the width direction and the end plate 400 among the plurality of battery cells 110. The support member 1000 can cover one side of the battery cell 110 located at one end in the width direction among the plurality of battery cells 110.

[0519] In other words, the support member 1000 can cover one surface of the end plate 400 of the battery cell 110 located at one end in the width direction among the plurality of battery cells 110.

[0520] Figure 35 It is used to explain and Figure 34 The longitudinal sectional views of the different support components, the separators, the battery cells, and the support components.

[0521] Reference Figure 35The support member 1000-1 may have a different shape than the support member 1000. For example, unlike the support member 1000 which only has a support partition body 1010, the support member 1000-1 may include a support partition body 1010, a first support cover 1030 and a second support cover 1040.

[0522] Both support member 1000 and support member 1000-1 can be arranged parallel to the cover 620-3. In addition, both support member 1000 and support member 1000-1 can cover one side of the battery cell 110 located at one end relative to the width direction among the plurality of battery cells 110.

[0523] The supporting partition body 1010 can be disposed between the battery cell 110 located at one end in the width direction and the end plate 400 among a plurality of battery cells 110. The supporting partition body 1010 can extend in the height direction.

[0524] The first support cover 1030 may extend from the support partition body 1010 toward the first cover 620a-5 or the second cover 620b-5. However, although Figure 35 The first support cover 1030 is shown extending from one end of the support partition body 1010 toward the first cover 620a-5 in the height direction, but this disclosure is not limited thereto, as long as it extends from the support partition body 1010.

[0525] The second support cover 1040 may extend from one end of the support partition body 1010 toward the first support body 660a-5 or the second support body 660b-5. However, although Figure 35 The second support cover 1040 is shown extending from the opposite end of the support partition body 1010 in the height direction toward the first support body 660a-5, but this disclosure is not limited thereto, as long as it extends from the support partition body 1010.

[0526] The supporting partition body 1010 can cover one surface of the battery cell 110 located at one end in the width direction among a plurality of battery cells 110, facing the width direction.

[0527] The first support cover 1030 can be arranged parallel to the first cover 620a-5 or the second cover 620b-5, and can cover one surface of the battery cell 110 located at one end in the width direction facing the height direction.

[0528] The second support cover 1040 can be arranged parallel to the first support 660a-5 or the second support 660b-5, and can cover the opposite surface of the battery cell 110 located at one end in the width direction facing the opposite side in the height direction.

[0529] The supporting partition body 610, the first supporting cover 1030, and the second supporting cover 1040 can be integrally formed.

[0530] Support member 1000 and support member 1000-1 can be used appropriately according to the number of battery cells 110. One support member 1000-1 can be used, or two support members can be used.

[0531] As an example, when the battery cell 110 located at one end of the width direction among the plurality of battery cells 110 is covered by the separating member 600-5, the support member 1000 can be used; when the battery cell 110 located at one end of the width direction among the plurality of battery cells 110 is not covered by the separating member 600-5, the support member 1000-1 can be used.

[0532] Although not shown separately in the accompanying drawings, according to another embodiment of this disclosure, the battery cell stack 100 (see...) Figure 1 ) may include a blocking member 800 (see Figure 10 ).

[0533] The separator 600-5 may include a first separator 600a-5 covering the first battery cell 111, and a second separator 600b-5 disposed parallel to the first separator 600a-5 while covering the second battery cell 112.

[0534] According to another embodiment of the present disclosure, the battery cell stack 100 may include a blocking member 800 that contacts i) at least one of the first battery cell 111 and the second battery cell 112, or ii) the first separator 600a-5 and the second separator 600b-5.

[0535] The barrier member 800 may be formed of a material that is heat-insulating or fire-resistant, or a material that is thermally conductive.

[0536] The blocking member 800 may be disposed between at least one of the first battery cell 110 and the second battery cell 112 separated by the separating body 610-5 and the separating body 610-5.

[0537] The blocking member 800 may be disposed between i) the first separating member 600-5 and the first battery cell 111, or ii) the second separating member 600b-5 and the second battery cell 112, or iii) the first separating member 600a-5 and the second separating member 600b-5.

[0538] The blocking member 800 may contact at least one of the first and second battery cells 111 and 112, or at least one of the first separating member 600a-5 and the second separating member 600b-5, to prevent the temperature of the first battery cell 111 or the second battery cell 112 from rising by improving thermal conductivity while ensuring fire resistance between the first battery cell 111 and the second battery cell 112.

[0539] Furthermore, although not shown separately in the accompanying drawings, the battery cell stack 100 may further include a cooling plate 850 disposed between the first separator 600a-5 and the second separator 600b-5 (see figure). Figure 10 ).

[0540] A cooling plate 850 may be disposed between the first separating member 600a-5 and the second separating member 600b-5 to cool the first separating member 600a-5 and the second separating member 600b-5, or the first battery cell 111 and the second battery cell 112. Alternatively, the cooling plate 850 may be disposed between a pair of blocking members 800 disposed between the first separating member 600a-5 and the second separating member 600b-5.

[0541] The cooling plate 850 may be formed of a material with thermal conductivity. The cooling plate 850 may also be formed of a material with heat dissipation properties. For example, the cooling plate 850 may be formed of aluminum.

[0542] Furthermore, although not shown separately in the accompanying drawings, at least a portion of the partition body 610-5 may be provided by the blocking member 800 (see...). Figure 10 Alternatively, a cooling plate 850 can be used instead.

[0543] In addition, instead of the blocking member 800 and the cooling plate 850, a surface pressure member 860 (see [link to surface pressure member]) can be used to apply surface pressure to the battery cell 110. Figure 12 ).

[0544] The blocking member 800 or cooling plate 850 can receive heat from the contacting separating member 600 or battery cell 110, and exchange heat with the cooling channels formed inside the battery pack housing 1200 through the thermal interface material 200. Here, the cooling channel may refer to the channel through which cooling water flows.

[0545] Figure 36 This is a longitudinal sectional view of a battery cell stack according to an embodiment of the present disclosure. Figure 37 yes Figure 36 An enlarged view of part A shown. Figure 38 yes Figure 36 An enlarged view of part B shown.

[0546] Reference Figures 36 to 38The battery cell stack 100-6 may include a plurality of battery cells 110 arranged along the width direction (the direction opposite to the X direction or the X direction), and a plurality of partition members 600-6 disposed between the plurality of battery cells 110 and separating the plurality of battery cells 110.

[0547] Multiple partition members 600-6 may include portions that overlap each other. For example, partition members 600-6 may include a first partition member 600a-6, a second partition member 600b-6, and a third partition member 600c-6.

[0548] The first partition member 600a-6 may include a first partition body 610a-6 disposed between a pair of battery cells 110 among a plurality of battery cells 110 and extending in the height direction (opposite to the Z direction), and a first cover 620a-6 extending from the first partition body 610a-6 in the width direction (opposite to the Y direction or the Y direction) to cover a surface of at least one of the pair of battery cells 110 separated by the first partition body 610a-6 facing the height direction side (Z direction).

[0549] The second partition member 600b-6 may include a second partition body 610b-6 that is arranged parallel to the first partition body 610a-6 and extends along the height direction (opposite to the Z direction), and a second cover body 620b-6 that extends from the second partition body 610b-6 along the width direction (opposite to the Y direction or the Y direction) and is disposed on the other side of the first cover body 620a-6 in the width direction (opposite to the X direction).

[0550] although Figure 36 The diagram shows a first cover 620a-6 and a second cover 620b-6 extending in opposite directions from the first partition body 610a-6 and the second partition body 610b-6. However, the invention is not limited to this. The shape of the partition member 600-6 can refer to the structure of the partition members 600, 600-1, 600-2, 600-3, 600-4, and 600-5 described above. That is, the overlapping structure between the partition members 600-6 described below can be applied to all of the partition members 600-1, 600-2, 600-3, 600-4, and 600-5 described above.

[0551] The third partition member 600c-6 may be disposed on the opposite side of one side of the second partition member 600b-6, wherein the first partition member 600a-6 is disposed on one side of the second partition member 600b-6.

[0552] The third partition member 600c-6 may include a third partition body 610c-6 that is arranged parallel to the second partition body 610b-6 and extends along the height direction (opposite to the Z direction), and a third cover body 620c-6 that extends from the third partition body 610c-6 along the width direction (opposite to the Y direction or the Y direction) and is arranged on the other side of the second cover body 620b-6 in the width direction (opposite to the X direction).

[0553] Multiple battery cells 110 may be disposed between the first separator 600a-6 and the second separator 600b-6. The number of battery cells 110 disposed between the first separator 600a-6 and the second separator 600b-6 is not limited to four, but at least one battery cell 110 may be disposed.

[0554] Furthermore, a barrier member 800 made of a heat-insulating or fire-resistant material, or a cooling plate (850) made of a heat-conducting material, may be placed between the second partition member 600b-6 and the third partition member 600c-6.

[0555] For example, a pair of blocking members 800 may be disposed between the second separating member 600b-6 and the third separating member 600c-6, and a cooling plate 850 may be disposed between the pair of blocking members 800.

[0556] However, the present invention is not limited thereto, as long as the blocking member 800 or the cooling plate 850 can be disposed between the second separating member 600b-6 and the third separating member 600c-6.

[0557] Reference Figure 37 The first partition member 600a-6 and the second partition member 600b-6 may include portions that overlap each other. At least one of the first cover 620a-6 and the second cover 620b-6 may include a portion that protrudes toward the other. At least a portion of the first cover 620a-6 may overlap with the second cover 620b-6.

[0558] For example, the first cover 620a-6 may include a portion that protrudes toward the second cover 620b-6.

[0559] For example, the first cover 620a-6 may include a first cover body region 621a-6 disposed on one side of the height direction (Z direction) of the battery cell 110, and a first cover protrusion region 622a-6 protruding from the first cover body region 621a-6 toward the second cover 620b-6.

[0560] For example, the second cover 620b-6 may include a second cover body region 621b-6 disposed on one side of the width direction of the first cover body region 621a-6 (in the opposite direction to the X direction), and a second cover insertion groove 623b-6 formed on the second cover body region 621b-6 for insertion of the first cover protrusion region 622a-6.

[0561] Reference Figure 37 The first cover 620a-6 may further include a first cover insertion groove 623 formed on the first cover body region 621a-6, and the second cover 620b-6 may further include a second cover protrusion region 622b protruding from the second cover body region 621b-6 toward the first cover insertion groove 623.

[0562] The first cover insertion slot 623 may be formed to open toward the second cover main body region 621b-6, and the second cover insertion slot 623b-6 may be formed to open toward the first cover main body region 621a-6.

[0563] Furthermore, the first cover protruding region 622a-6 and the second cover protruding region 622b may have a tapered shape in opposite directions.

[0564] According to this structure, since the first cover 620a-6 and the second cover 620b-6 can be joined and overlapped with each other, even if the battery cell 110 expands and applies pressure to the first cover 620a-6 and the second cover 620b-6, it can prevent the first cover 620a-6 and the second cover 620b-6 from being separated from each other.

[0565] Therefore, according to another embodiment of the present invention, even if a fire occurs in a battery cell 110, a robust isolation structure between the battery cells 110 can be maintained, and heat transfer between the battery cells 110 can be delayed.

[0566] At the same time, such as Figure 38 As shown, at least one of the second partition member 600b-6 and the third partition member 600c-6 may protrude toward the other.

[0567] For example, the second cover 620b-6 may include a portion that protrudes toward the third cover 620c-6.

[0568] The third cover 620c-6 may include a third cover body region 621c-6 disposed on one side of the width direction (opposite to the X direction) of the second cover body region 621b-6, and a cover mounting groove 628c-6 formed on the third cover body region 621c-6.

[0569] The second cover 620b-6 may include a cover placement area 627b-6 that protrudes from the second cover body region 621b-6 toward the third cover body region 621c-6 and is inserted into the cover placement groove 628c-6.

[0570] The length of the cover placement area 627b-6 in the width direction (i.e., the direction opposite to the X direction) may be shorter than the length of the first cover protrusion area 622a-6 in the width direction (i.e., the direction opposite to the X direction).

[0571] This may be because a more robust structure is required between the first cover 620a-6 and the second cover 620b-6 than between the second cover 620b-6 and the third cover 620c-6.

[0572] Based on the structure of the cover mounting area 627b-6 and the cover mounting groove 628c-6, the cover mounting area 627b-6 can cover one side of the height direction (Z direction) of the blocking member 800 or one side of the height direction (Z direction) of the cooling plate 850.

[0573] According to this structure, not only does it cover the height direction side (Z direction) of the blocking member 800 and the cooling plate 850 that can be set between the second separator 600b-6 and the third separator 600c-6, but even if the battery cell 110 expands, the robust structure between the second separator 600b-6 and the third separator 600c-6 will not be shaken, thereby delaying the heat transfer between the battery cells 110.

[0574] The cover mounting groove 628c-6 can be formed in a shape that opens toward the second cover body area 621b-6, or in a shape that opens toward one side in the height direction (Z direction).

[0575] The aforementioned cover mounting groove 628c-6 can be applied to the structure of the first partition member 600a-6 as is, and the first cover protruding area 622a-6 and the first cover insertion groove 623 can be applied to the structure of the third partition member 600c-6 as is.

[0576] at the same time, Figures 36 to 38 The separator 600-6 of the battery cell stack 100-6 shown may have the same as Figure 3 The battery cell stack 100 shown has different shapes of separators 600.

[0577] For example, the partition member 600 may not include the overlapping portion of the blocking member 800 or the cooling plate 850 disposed between the plurality of partition members 600 on one side (Z direction) in the height direction, and the partition member 600-6 may not include the overlapping portion of the blocking member 800 or the cooling plate 850 disposed between the plurality of partition members 600-6 on one side (Z direction) in the height direction.

[0578] Figure 39 This is a front view of the first and second partition members when viewed in the longitudinal direction according to another embodiment of the present invention.

[0579] Reference Figure 39 The first cover 620a-6 of the first partition member 600a-6 and the second cover 620b-6 of the second partition member 600b-6 may be different from those of the first cover 620a-6 of the first partition member 600a-6 and the second cover 620b-6 of the second partition member 600b-6. Figure 36 The structure of the first cover 620a-6 of the first partition member 600a-6 and the second cover 620b-6 of the second partition member 600b-6 shown herein, in addition to the descriptions below, also refers to... Figures 36 to 38 The description.

[0580] For example, the first cover 620a-6 may be positioned overlapping the second cover 620b-6. The first cover 620a-6 may include a first cover body region 621a-6 and a first cover protruding region 622a-6. The second cover 620b-6 may include a second cover body region 621b-6 and a second cover insertion groove 623b-6.

[0581] The second cover insertion groove 623b-6 may be formed on the second cover body region 621b-6 and may be formed in a concave shape. The second cover insertion groove 623b-6 may be formed to allow the second cover protruding region 622a-6 to be inserted. The second cover insertion groove 623b-6 may have a shape that opens toward the height direction side (Z direction).

[0582] The first cover protruding region 622a-6 can extend from the second cover body region 621a-6 toward the second cover body region 621b-6, and can be bent to be inserted into the second cover insertion slot 623b-6. That is, the first cover protruding region 622a-6 can be inserted into and fixed into the second cover insertion slot 623b-6 by a snap-fit ​​engagement.

[0583] The first cover protruding region 622a-6 can protrude from the first cover body region 621a-6 toward the second cover body region 621b-6, and can protrude to be placed and fixed in the second cover insertion slot 623b-6.

[0584] As described above, the second cover insertion slot 623b-6 may have the following characteristics: Figure 37The shape shown is concave on one side in the width direction, or as... Figure 39 The shape shown is concave towards the height direction (Z direction).

[0585] Figure 40 This is a perspective view of the first end cover of the first partition member and the second end cover of the second partition member according to embodiments of the present disclosure. Figure 41 This is a longitudinal sectional view of the first partition member and the second partition member when the first end cover of the first partition member and the second end cover of the second partition member are connected. Figure 42 This is a cross-sectional view of the first partition member and the second partition member when the first guide cover of the first partition member and the second guide cover of the second partition member are connected. Reference Figure 40 , Figure 41 , Figure 42

[0586] And such as Figure 6 As shown, the first end cover 630a-6 of the first partition member 600a-6 (see...) Figure 36 It can extend from the first cover 620a-6 to the opposite side in the height direction (opposite to the Z direction) on one side of the battery cell 110 covered by the first cover 620 in the length direction.

[0587] The first end cover 630a-6 may extend from the first cover 620a-6 to cover at least a portion of the battery cell 110 separated by the first separator 610a-6 on one side of the battery cell 110 separated by the first separator 610a-6 in the longitudinal direction.

[0588] The second end cover 630b-6 of the second partition member 600b-6 may extend from the second cover 620b-6 to the opposite side in the height direction (opposite to the Z direction) on one side of the battery cell 110 covered by the second cover 620b-6 in the longitudinal direction.

[0589] The second end cover 630b-6 may extend from the second cover 620b-6 to cover at least a portion of the battery cell 110 on one side of the battery cell 110 separated by the second partition body 610b-6 in the longitudinal direction.

[0590] The first end cover 630a-6 and the second end cover 630b-6 can be arranged parallel to each other.

[0591] When the first separator 600a-6 and the second separator 600b-6 are viewed at intervals in the height direction of the multiple battery cells 110, the first end cover 630a-6 can be positioned at a position that overlaps with the second end cover 630b-6.

[0592] As an example, the first end cover 630a-6 may include a first end body region 631a-6, a first end protrusion region 632a-6 protruding from the first end body region 631a-6 toward the second end cover 630b-6, or a first end cover groove 633a-6 formed on the first end body region 631a-6.

[0593] The second end cover 630b-6 may include a second end body region 631b-6, a second end protrusion region 632b-6 protruding from the second end body region 631b-6 toward the first end cover 630a-6, or a second end cover groove 633b-6 formed on the second end body region 631b-6.

[0594] The first end cap 630a-6 may include a first end protrusion region 632a-6 formed on one side in the width direction and a first end cap groove 633a-6 formed on the opposite side in the width direction.

[0595] The second end cap 630b-6 may include a second end protrusion region 632b-6 formed on one side of the width direction and a second end cap groove 633b-6 formed on the opposite side of the width direction.

[0596] The first protruding region 632a-6 and the second protruding region 632b-6 can protrude in the same direction from the first main body region 631a-6 and the second main body region 631b-6, respectively.

[0597] The second protruding area 632b-6 can be inserted into the first end cap groove 633a-6. The first protruding area 632a-6 can be inserted into the second end cap groove 633b-6.

[0598] With this structure, even if the battery cell 110 expands, the second end cover 630b-6 and the first end cover 630a-6 can improve the delay in heat transfer to the battery cell 110 that has not caught fire caused by external foreign objects or high-pressure fluids introduced from one side of the battery cell stack 100 in the height direction.

[0599] Furthermore, the overlapping structure of the first end cover 630a-6 and the second end cover 630b-6 prevents the first end cover 630a-6 and the second end cover 630b-6 from separating even when pressure is applied to them.

[0600] Therefore, even if a fire occurs in a battery cell 110, a robust isolation structure between multiple battery cells 110 can be maintained, and heat transfer between multiple battery cells 110 can be delayed.

[0601] Figure 41The first or second structure can be selected according to the connection direction of the first end cover 630a-6 and the second end cover 630b-6.

[0602] Furthermore, the first guide cover 640a-6 may be arranged parallel to the first end cover 630a-6 on one side of the battery cell 110 covered by the first cover 620a along the length direction.

[0603] The second guide cover 640b-6 may be arranged parallel to the second end cover 630b-6 on one side of the battery cell 110 covered by the second cover 620b-6 along the length direction.

[0604] When the first guide cover 640a-6 and the second guide cover 640b-6 are spaced apart from each other in the length direction of the plurality of battery cells 110 and the first separator 600a-6 and the second separator 600b-6 are observed, at least a portion of the first guide cover 640a-6 may be disposed at a position overlapping with the second guide cover 640b-6.

[0605] The first guide cover 640a-6 may include a first guide body region 641a-6, a first guide protrusion region 642a-6 protruding from the first guide body region 641a-6 toward the second guide cover 640b-6, or a first guide cover groove 643a-6 formed on the first guide body region 641a-6.

[0606] The second guide cover 640b-6 may include a second guide body region 641b-6, a second guide protrusion region 642b-6 protruding from the second guide body region 641b-6 toward the first guide cover 640a-6, or a second guide cover groove 643b-6 formed on the second guide body region 641b-6.

[0607] The first guide cover 640a-6 may include a first guide protrusion 642a-6 formed on one side of the width direction of the first guide body region 641a-6 and a first guide cover groove 643a-6 formed on the opposite side of the width direction of the first guide body region 641a-6.

[0608] The second guide cover 640b-6 may include a second guide protrusion 642b-6 formed on one side of the width direction of the second guide body region 641b-6 and a second guide cover groove 643b-6 formed on the opposite side of the width direction of the second guide body region 641b-6.

[0609] The first guiding protrusion area 642a-6 and the second guiding protrusion area 642b-6 can protrude in the same direction from the first guiding main body area 641a-6 and the second guiding main body area 641b-6, respectively.

[0610] The second guide protrusion 642b-6 can be inserted into the first guide cover groove 643a-6. The first guide protrusion 642a-6 can be inserted into the second guide cover groove 643b-6.

[0611] With this structure, even if the battery cell 110 expands, the second guide cover 640b-6 and the first guide cover 640a-6 can improve the delay in heat transfer to the battery cell 110 that has not caught fire caused by external foreign objects or high-pressure fluids introduced from one side of the battery cell stack 100 along its length.

[0612] Furthermore, the overlapping structure of the first guide cover 640a-6 and the second guide cover 640b-6 prevents the first guide cover 640a-6 and the second guide cover 640b-6 from separating even when pressure is applied due to the expansion of the battery cell 110.

[0613] Therefore, even if a fire occurs in a battery cell 110, a robust isolation structure between multiple battery cells 110 can be maintained, and heat transfer between multiple battery cells 110 can be delayed.

[0614] Figure 42 The first or second structure can be selected according to the connection direction of the first guide cover 640a-6 and the second guide cover 640b-6.

[0615] The overlapping relationship between the first end cover 630a-6 and the second end cover 630b-6, and the overlapping relationship between the first guide cover 640a-6 and the second guide cover 640b-6, are not limited to the partition member 600-6 according to the embodiments of the present disclosure, but can also be applied to partition members 600, 600-1, 600-2, 600-3, 600-4 and 600-5.

[0616] Figure 43 This is a side view of the end cover viewed in the width direction according to yet another embodiment of the present disclosure. Figure 44 This is an exploded perspective view showing the connection member and guide connection member spaced apart from the end plate of the battery cell stack according to yet another embodiment of the present disclosure. Figure 45 This is a side view of the separator, connecting member, guide connecting member and nut member of a battery cell stack viewed along the length direction according to yet another embodiment of this disclosure.

[0617] Reference Figure 43 , Figure 44 and Figure 45The plurality of partition members 600 may include connecting holes 635 formed on regions facing each other. Connecting holes 635 may be formed in the end caps 630 of each of the plurality of partition members 600. Connecting holes 635 may be formed on the end body region 631 of the end cap 630. Connecting holes 635 may be formed to extend through the width of the end body region 631.

[0618] As described above, the first separating member 600a (see...) Figure 8 The first partition 600a may include a first end cover 630a. The second partition 600b may include a second end cover 630b. The first partition 600a and the second partition 600b may be arranged parallel to each other.

[0619] As described above, the first end cover 630a can protrude from the first cover 620a to the opposite side in the height direction (opposite to the Z direction) on one side of the battery cell 110 covered by the first cover 620a in the length direction.

[0620] As described above, the second end cover 630b can protrude from the second cover 620b to the opposite side in the height direction (opposite to the Z direction) on one side of the battery cell 110 covered by the second cover 620b in the length direction.

[0621] Both the first end cover 630a and the second end cover 630b may include a connecting hole 635. The connecting hole 635 may have a shape that opens toward the width direction (or the direction opposite to the X direction). The connecting hole 635 of the first end cover 630a and the connecting hole 635 of the second end cover 630b may be formed in a position facing each other.

[0622] Furthermore, the first partition member 600a may further include a first guide cover 640a. The first guide cover 640a may be disposed parallel to the first end cover 620a to cover the battery cell 110 covered by the first cover 620a, and may include a guide hole (not shown).

[0623] The second partition member 600b may further include a second guide cover 640b. The second guide cover 640b may be spaced apart from the second end cover 620b in the height direction to cover the battery cell 110 covered by the second cover 620b, and may include a guide hole (not shown).

[0624] The guide hole of the first guide cover 640a and the guide hole of the second guide cover 640b can be formed in a position facing each other.

[0625] The battery cell stack 100 may include end plates 400 disposed on opposite sides of the width direction of the plurality of battery cells 110.

[0626] The end plate 400 may include an end hole 410 formed at a position facing the connection hole 635 of the first end cover 630a or the connection hole 635 of the second end cover 630b.

[0627] The end plate 400 may include a guide end hole 420 formed at a position facing the guide hole of the first guide cover 640a or the guide hole of the second guide cover 640b.

[0628] The battery cell stack 100 may include a connecting member F that passes through both the end hole 410 and the connecting hole 635 to secure the end plate 400 and the separator 600 together.

[0629] The connecting member F can pass through at least one of the end holes 410 of a pair of end plates 400 and the connecting hole 635 of the first end cover 630a and the connecting hole 635 of the second end cover 630b to fix the end plates 400 and the separator 600 together.

[0630] The battery cell stack 100 may include a guide connection member GF that passes through both the guide end hole 420 and the guide hole to secure the end plate 400 and the separator member 600 together.

[0631] The guide connecting member GF can pass through at least one of the guide holes of the first guide cover 640a and the second guide cover 640b, and at least one of the guide end holes 420 of the end plate 400, to secure a pair of end plates 400 and the separator member 600 together.

[0632] The battery cell stack 100 may include a nut member N that is connected to the connecting member F and the guide connecting member GF to fix the position of the connecting member F and the guide connecting member GF.

[0633] This structure prevents the battery cell 110 from expanding inside the battery cell stack 100, and also prevents external foreign objects or high-pressure fluids from entering the battery cell 110 from the area where the distance between the multiple separating members 600 increases due to expansion.

[0634] Therefore, the battery cell stack 100 can delay heat transfer from the battery cell 110 that has caught fire to the battery cell 110 that has not caught fire.

[0635] Furthermore, according to this structure, even if the battery cell 110 expands, the isolation between multiple battery cells 110 can be maintained by the robust structure, thereby delaying the heat transfer between multiple battery cells 110.

[0636] As described above, the plurality of separating members 600 of the battery cell stack 100 may include connection holes 635 or guide holes formed on areas facing each other.

[0637] Figure 46 This is a perspective view of a partition member according to an embodiment of the present disclosure, wherein one surface is formed of a thermally conductive material or a thermally insulating material.

[0638] Reference Figure 46 One surface of the partition body 610 of the partition member 600 may be formed of a thermally conductive material or a thermally insulating material.

[0639] One surface of the separator 610 may face a pair of battery cells 110 separated by the separator 610 (see...) Figure 3 At least one of the surfaces of ().

[0640] As an example, according to an embodiment of this disclosure, the first dividing body 610a facing the first battery cell 111 (see...) Figure 9 One surface of the second separator body 610b facing the second battery cell 112 may be formed of a thermally conductive material or a material that is thermally insulating or fire-resistant.

[0641] As an example, according to another embodiment of this disclosure, a separating body 610-1 facing at least one of a pair of battery cells 111 and 112 (see...) Figure 17 One surface of the material can be formed of a thermally conductive material or a material that is thermally insulating or fire-resistant.

[0642] As an example, according to another embodiment of this disclosure, the separating body 610-2 facing the first battery cell 111 (see...) Figure 24 One surface of the material can be formed of a thermally conductive material or a material that is thermally insulating or fire-resistant.

[0643] As an example, according to another embodiment of this disclosure, the separating body 610-3 facing the first battery cell 111 (see...) Figure 30 One surface of the material can be formed of a thermally conductive material or a material that is thermally insulating or fire-resistant.

[0644] As an example, according to another embodiment of this disclosure, a separating body 610-4 facing at least one of a pair of battery cells 111 and 112 (see...) Figure 32 One surface of the material can be formed of a thermally conductive material or a material that is thermally insulating or fire-resistant.

[0645] As an example, according to another embodiment of this disclosure, the first separator body 610a-5 facing the first battery cell 111 (see...) Figure 34 One surface of the second separator body 610b-5 facing the second battery cell 112 may be formed of a thermally conductive material or a material that is thermally insulating or fire-resistant.

[0646] For example, according to another embodiment of the present invention, the first separating body 610a-6 facing the battery cell 110 (see...) Figure 36 One surface of the second separator body 610b-6 facing the battery cell 110 may be formed of a thermally conductive material or a material that is thermally insulating or fire-resistant.

[0647] This structure can delay heat transfer between multiple battery cells 110 stacked in the width direction.

[0648] Figure 47 This is a schematic diagram of the manufacturing process of a battery cell according to an embodiment of the present disclosure. Figure 48 This is an enlarged view of the cover of a battery cell according to an embodiment of the present disclosure. Figure 49 This is a cross-sectional view of a battery cell stack according to an embodiment of the present disclosure.

[0649] Reference Figure 47 , Figure 48 and Figure 49 The battery cell 110 may include an electrode stack 113 and a housing 115. The electrode stack 113 includes a first electrode, a second electrode with a polarity different from that of the first electrode, and a separator disposed between the first electrode and the second electrode. The housing 115 surrounds the electrode stack 113.

[0650] The housing 115 may include an encapsulation region 116 surrounding an electrode stack 113 containing a first electrode, a second electrode, and a diaphragm, and an extension region 117 extending from the encapsulation region 116 to the opposite side in the longitudinal direction.

[0651] As an example, the housing 115 may be formed of aluminum. The encapsulation region 116 of the housing 115 is the portion pressed by a mold during the manufacturing process of the battery cell 110, and may be formed to be thinner than the unpressed portion, thus potentially having lower durability.

[0652] The circumferential portion of the encapsulation area 116 needs to be protected so that the battery cell 110 can prevent external foreign objects or high-pressure fluids from entering the electrode stack 113.

[0653] Therefore, the opposite surfaces of the encapsulation region 116 in the height direction can be composed of the covers 620, 620-1, 620-2, 620-3, 600-4, 600-5 and 600-6 of the aforementioned separating members 600, 600-1, 600-2, 600-3, 600-4, 600-5 and 600-6, 620a-5, 620b-5, 620a-6, 620b-6 and 620c-6, and the thermal interface material 200 (see Figure 3 ) and support bodies 660-3 and 660-4 cover.

[0654] Furthermore, in order to cover the opposite surfaces of the encapsulation region 116 in the length direction, the opposite side of the encapsulation region 116 in the length direction may be bent toward one side or the opposite side in the width direction. The extension region 117 of the battery cell 110 may partially cover the encapsulation region 116 on one side of the electrode stack 113 in the length direction.

[0655] Therefore, the portion of the circumferential portion of the encapsulation region 116 of the battery cell 110, excluding the portion covered by the extended region 117, also needs to be covered.

[0656] Therefore, in order to cover the opposite sides of the multiple battery cells 110 in the longitudinal direction, the battery cell stack 100 may utilize the sensing component 510 and the sensing cover 500.

[0657] The sensing component 510 may include a busbar electrically connected to a plurality of battery cells 110, and a sensing frame 520 supporting the busbar. A sensing cover 500 may cover the outer side of the sensing component 510.

[0658] The sensing frame 520 may include a frame body region 521 that supports the busbar 525 while facing multiple battery cells 110, and a frame partition region 530 that protrudes from the frame body region 521 toward the partition member 600.

[0659] The frame partition region 530 may extend from the frame main body region 521 toward the partition body 610. The frame partition region 530 may contact the connecting body 650. The connecting body 650 may be a portion protruding from the partition body 610 in the width direction.

[0660] In a plurality of battery cells 110, each of a pair of battery cells 110 separated by a separator 600 may include a cell lead portion 110a extending to one side in the length direction.

[0661] The frame partition region 530 can be disposed between the individual lead portions 110a of a pair of battery cells 110.

[0662] Multiple frame partition regions 530 may also be provided, and all of the multiple frame partition regions 530 may be provided between a pair of individual cell lead portions 110a. The frame partition region 530 may cover the area of ​​a pair of battery cells 110 on one side of the length direction, excluding the individual cell lead portion 110a.

[0663] Figure 49 A partition member 600 according to an embodiment of the present disclosure is shown, but the sensing component 510 and the sensing cover 500 may be used together with partition members 600-1, 600-2, 600-3, 600-4, 600-5 and 600-6.

[0664] Through this structure, since the encapsulation area 116 of the battery cell 110 can be composed of the covers 620, 620-1, 620-2, 620-3, 620-4, 620a-5, 620b-5, 620a-6, 620b-6 and 620c-6 of the separating members 600, 600-1, 600-2, 600-3, 600-4, 600-5 and 600-6, and the thermal interface material 200 (see...) Figure 3 The battery cell stack 100 is covered by the support bodies 660-3, 660-4 and the sensing components 510, thus improving the safety of the battery cell stack 100.

[0665] Meanwhile, the frame partition region 530 may have a portion in which the cross-section on a plane perpendicular to the direction away from the battery cell 110 widens as it moves away from the battery cell 110, starting from the end facing the battery cell 110.

[0666] With this structure, even if the cell lead portion 110a contacts one end of the frame partition region 530, the cell lead portion 110a can be guided to the frame body region 521 along the inclined shape of the frame partition region 530, thereby improving the manufacturing performance of the battery cell stack 100.

[0667] Furthermore, with this structure, since the circumferential portion of the encapsulation area 116 of the battery cell 110 on one side of the length direction, excluding the cell lead portion 110a, can be covered by the frame body area 521 and the frame partition area 530, foreign objects or high-pressure fluids outside the battery cell stack 100 can be prevented from entering along the length direction of the battery cell 110, thereby delaying the heat transfer to the battery cell 110.

[0668] The structure of the battery cell 110 and the structure of the sensing component 510 can be used not only with the separator 600 according to an embodiment of the present disclosure, but also with the separator 600-1 according to another embodiment of the present disclosure or the separators 600-2, 600-3, 600-4, 600-5 and 600-6 according to yet another embodiment of the present disclosure.

[0669] Figure 50 This is a cross-sectional view of a battery cell, a separator, and a sensing assembly according to another embodiment of the present disclosure.

[0670] Reference Figure 50 According to another embodiment of the present disclosure, a battery cell stack 100 (see...) Figure 1 The sensing frame 520, except Figure 49 In addition to the components, it may further include a frame guide region 540.

[0671] The frame guide region 540 can protrude from the frame partition region 530 toward the battery cell 110.

[0672] Each of the multiple battery cells 110 may include a cell lead portion 110a extending to the opposite side in the length direction of the battery cell stack 100.

[0673] In this configuration, the frame guide region 540 may be disposed between the cell lead portions 110a of the plurality of cell 110 and may be spaced apart from the cell lead portion 110a of each of the plurality of cell 110.

[0674] The frame guide region 540 may include one end facing the battery cell 110. One end of the frame guide region 540 may be located closer to the battery cell 110 than the end of the frame separator region 530 facing the battery cell 110.

[0675] Meanwhile, the frame guide area 540 may also have a portion in which the cross-section on a plane perpendicular to the direction away from the battery cell 110 widens as it moves away from the battery cell 110, starting from the end facing the battery cell 110.

[0676] With this structure, even if a pair of individual lead portions 110a located between a pair of frame dividing regions 530 contact one end of the frame guiding region 540, they can be guided along the inclined surface of the frame guiding region 540 to the frame body region 521 as the appropriate position.

[0677] Figure 51 This is a longitudinal sectional view of other battery cells, internal fire-resistant components, partition components, and external fire-resistant components according to embodiments of this disclosure. Figure 52 It is a plan view of a cover including ventilation holes, according to various embodiments. Figure 53 Side and plan views of a fire-resistant member including a cutout portion of the cover, viewed along its length according to various embodiments, are shown.

[0678] Reference Figure 51 , Figure 52 and Figure 53 The cover 620 of the partition member 600 may include a cover vent 625 formed on the area facing the battery cell 110. The cover vent 625 may be a hole for discharging foreign matter or high-pressure fluid from the battery cell 110 in the event of a fire to the outside of the battery cell stack 100.

[0679] An internal fire-resistant component 700 may be disposed between the cover 620 and the battery cell 110, and may include a portion 624 formed facing the cover (see...). Figure 3 The internal cutout portion 710, which is thinner than the surrounding thickness or has a cutout shape, is located on the area of ​​the vent hole 625 of the cover.

[0680] In addition, the cover 620 and the battery pack cover 1300 may be provided with an external fire-resistant member 900. The external fire-resistant member 900 may include an external cut-out portion 910 formed on the area facing the cover ventilation hole 625 or the cover cut-out portion 624, with a thickness less than the peripheral thickness or having a cut-out shape.

[0681] Thus, the battery cell stack 100 may further include an external fire-resistant member 900 disposed on the outside of the cover 620.

[0682] When a fire occurs in the battery cell 110, the internal cutout portion 710 of the internal fire-resistant component 700 may be cut off along the boundary line of the cover ventilation hole 625 or the cover cutout portion 624 due to the pressure caused by the fire.

[0683] When the inner cut portion 710 is cut, the outer cut portion 910 can also be cut, and the battery cell 110 and the battery cell stack 100 (see...) Figure 1 The outside of each can be connected to the other.

[0684] Therefore, foreign objects or high-pressure fluids caused by the fire can be discharged to the battery pack cover 1300 outside the battery cell stack 100, and the heat transfer to another battery cell 110 adjacent to the battery cell 110 where the fire occurred can be delayed.

[0685] like Figure 52 As shown, the vent 625 in the cover can have different shapes depending on the embodiment. The vent 625 can be formed on the main body region 621 of the cover 620. The vent 625 can be formed to penetrate the main body region 621 in a direction perpendicular to the main body region 621.

[0686] As an example, the cover vent 625 may have an elliptical shape, such that the length direction of the battery cell 110 is the major axis direction.

[0687] As an example, multiple vent holes 625 can be formed in the cover, and they can have a circular shape.

[0688] As an example, a pair of adjacent cover body regions 621 may be formed together in a cover vent 625. The cover vent 625 may be formed in a generally rectangular shape with rounded corners.

[0689] like Figure 53 As shown, the internal fire-resistant component 700 can be formed into different shapes according to various embodiments.

[0690] As an example, the internal cutout portion 710 of the internal fire-resistant component 700 may have a shape that is cut around a specific range, or it may have a shape that is thinner than the surrounding thickness while around a specific range.

[0691] As an example, the internal cutout portion 710 may be formed as a rectangular shape in the length direction and the width direction of the internal fire-resistant member 700.

[0692] As an example, the internal cutout portions 710 may extend to intersect each other and may form an “X” shape when viewed from a distance from and in relation to the internal refractory member 700.

[0693] As an example, the internal cutout portion 710 may extend in a straight line along the length direction of the internal fire-resistant member 700.

[0694] As an example, the internal cutout portion 710 may extend in a straight line along the length direction of the internal fire-resistant member 700, and a plurality of internal cutout portions 710 may be configured to be spaced apart from each other in the width direction.

[0695] As an example, the internal cutout portion 710 may extend in the length direction, such that the central region of the internal fire-resistant member 700 is cut off, and branches may be formed at both ends thereon.

[0696] Figure 52 and Figure 53 The shapes of the cover ventilation hole 625 and the internal cutout portion 710 shown can be selected.

[0697] With this structure, when a fire occurs in a battery cell 110, foreign objects or high-pressure fluids caused by the fire cut off the internal cutout portion 710 of the internal fire-resistant component 700, and cut off the external cutout portion 910 through the cover ventilation hole 625 or the cover cutout portion 624, so that they can be discharged to the outside of the battery cell stack 100, thereby delaying the heat transfer to another battery cell 110 adjacent to the battery cell 110 that is on fire.

[0698] In this way, when a fire occurs in a battery cell 110, the battery cell stack 100 can discharge foreign objects or high-pressure fluids caused by the fire upward or downward to the outside of the battery cell stack 100, depending on the installation direction of the battery cell stack 100.

[0699] In this case, for the partition member 600 inside the battery cell stack 100, not only the partition member 600 according to the embodiment of the present disclosure can be applied, but also the partition member 600-1 according to another embodiment of the present disclosure, or the partition members 600-2, 600-3, 600-4, 600-5 and 600-6 according to yet another embodiment of the present disclosure can be applied.

[0700] Figure 54 This is a perspective view of a battery cell stack according to yet another embodiment of the present disclosure. Figure 55 yes Figure 54The image shows a cross-sectional view of the battery cell, sensing assembly, sensing fire-resistant component, and sensing cover.

[0701] Reference Figure 54 and Figure 55 ,and Figure 50 The battery cell stack 100 shown in various embodiments differs. According to another embodiment of this disclosure, the battery cell stack 100 may have a structure that discharges foreign matter or high-pressure fluid caused by the fire to the opposite side of the length direction of the battery cell stack 100 when the battery cell 110 catches fire.

[0702] According to yet another embodiment of the present disclosure, the battery cell stack 100 may include a sensing component 510, a sensing cover 500, and a sensing fire-resistant component 700-1 that are different from those in the above embodiments.

[0703] According to another embodiment of the present disclosure, the sensing component 510 may include a busbar 525 electrically connected to a plurality of battery cells 110, and a sensing frame 520 supporting the busbar 525 and having sensing holes 511 formed in the area facing the plurality of battery cells 110.

[0704] According to yet another embodiment of this disclosure, the sensing cover 500 may cover the outer side of the sensing component 510 and includes a cover hole 501 formed in the area facing the sensing hole 511.

[0705] Furthermore, according to another embodiment of this disclosure, the sensing fire-resistant member 700-1 may be disposed between the sensing component 510 and the sensing cover 500, and includes a sensing cut portion 710-1 formed on the area facing the sensing hole 511 and the sensing cover hole 501, which is thinner than the surrounding thickness or has a cut shape.

[0706] With this structure, when any one of the multiple battery cells 110 catches fire, foreign objects or high-pressure fluid caused by the fire will contact the sensing fire-resistant component 700-1 along the sensing hole 511, and the sensing cut portion 710-1 can be cut off.

[0707] When the sensing cut portion 710-1 is cut off, the sensing hole 511 and the sensing cover hole 501 can communicate with each other, and foreign objects or high-pressure fluid caused by the fire can be discharged to the outside of the battery cell stack 100 through the sensing cover hole 501.

[0708] Figure 54 and Figure 55 The sensing component 510 and sensing cover 500 shown can be applied not only to the separator 600, but also to the battery cell stack 100 including separators 600-1, 600-2, 600-3, 600-4, 600-5 and 600-6.

[0709] Meanwhile, the aforementioned partition components 600, 600-1, 600-2, 600-3, 600-4, 600-5 and 600-6 can be used in combination with materials that have fire resistance or heat insulation properties.

[0710] Figure 56 This is a plan view of a battery pack with a stack of battery cells installed according to an embodiment of the present disclosure.

[0711] Reference Figure 56 The battery cell stack 100 according to the above embodiment can be mounted on the battery pack 1100. The battery pack 1100 may include a battery pack housing 1200, and the battery cell stack 100 is disposed on the battery pack housing 1200.

[0712] When a fire occurs in any one of the multiple battery cell stacks 1100 inside the battery pack 1100, due to the above-mentioned structure or principle, foreign objects or high-pressure fluids can be discharged to the outside of the battery cell stack 100 without entering the adjacent battery cell stack 100, and can be discharged to the outside of the battery pack 1100.

[0713] According to this technology, since the separating components can spatially separate the stacked battery cells in the width direction from each other, even if a fire occurs in any one of the battery cells in the space, it can prevent a fire from occurring in the battery cells in the adjacent spaces.

[0714] Furthermore, the separation body of the separator can delay heat transfer between adjacent battery cells, and even if any one battery cell catches fire, it can prevent adjacent battery cells from catching fire.

[0715] Furthermore, according to this technology, since the separator body and the cover of the separator are integrally formed, one surface of the battery cell in the width direction and one surface of the battery cell in the height direction can be covered, thereby improving the assembly performance of the battery cell stack.

[0716] Furthermore, according to this technology, since a cover ventilation hole or a cover cutout is formed on the cover of the separating member, even if a battery cell catches fire, foreign objects or high-pressure fluids can be discharged to the outside of the battery cell stack without flowing to adjacent battery cells.

[0717] Furthermore, according to this technology, since the end cover, guide cover and connecting body of the separator can cover the area on the opposite side of the battery cell in the length direction except for the cell lead portion, it can prevent external foreign objects or high-pressure fluid from entering through one side of the battery cell in the length direction.

[0718] Furthermore, according to this technology, since the cover, end cover and guide cover of an adjacent pair of separating members overlap or are connected to each other, even if the battery cell expands, it can prevent external foreign objects or high-pressure fluids from entering the battery cell.

[0719] Furthermore, according to this technology, since multiple separators and end plates are connected to each other, even if the battery cell expands, the gap between adjacent separators can be prevented from widening, thereby preventing external foreign objects or high-pressure fluids from entering the battery cell.

[0720] Furthermore, according to this technology, since a blocking member or cooling plate is provided that contacts the separator or battery cell, the temperature of the battery cell can be prevented from rising excessively, thereby improving the safety of the battery cell stack.

[0721] In addition, various effects can be provided directly or indirectly through this disclosure.

[0722] The above description is merely an example of the technical concept of this disclosure, and those skilled in the art can make various modifications and changes without departing from the essential characteristics of this disclosure.

[0723] Therefore, the embodiments described herein are intended to explain the technical concept of the disclosure and not to limit it, and the scope and spirit of the disclosure are not limited to the above embodiments. The scope of protection of this disclosure should be interpreted through the appended claims, and all equivalents thereof should be interpreted as being included within the scope of this disclosure. Explanation of reference numerals in the attached figures 100, 100-6: Stacked battery cells 110: Battery cell 110a: Single-cell lead section 111: First battery cell 111a: First monomer lead section 112: Second battery cell 112a: Second monomer lead section 113: Electrode stack 115: Casing 116: Packaging area 117: Extended Area 200: Thermal interface materials 400: End plate 500: Sensor Cover 501: Cover Hole 510: Sensing Components 511: Sensing aperture 520: Sensing Frame 521: Main Frame Area 530: Frame-separated area 540: Frame Boot Area 550: Busbar 600, 600-1, 600-2, 600-3, 600-4, 600-5, 600-6: Separating components 600a, 600a-1, 600a-2, 600a-5, 600a-6: First dividing member 600b, 600b-1, 600b-2, 600b-5, 600b-6: Second partition members 600c-6: Third partition component 610, 610-1, 610-2, 610-3, 610-4: Separating the main body 610a, 610a-5, 610a-6: First dividing body 610b, 610b-5, 610b-6: Second dividing body 610c-6: Third dividing body 620, 620-1, 620-2, 620-3, 620-4: Cover 620a, 620a-5: First cover body 620b, 620b-5: Second cover 620c-6: Third cover 621: Main body area 621a, 621a-6: Main body area of ​​the first cover 621b, 621b-6: Main body area of ​​the second cover 622: Protruding area of ​​the cover 622a, 622a-6: Protruding areas of the first cover body 622b: Second cover protrusion area 623: Cover insertion slot, first cover insertion slot 623b-6: Second cover insertion slot 624: Cut-out portion of the lid 625: Ventilation holes in the cover 626: Cap Rib 626a: First cover rib 626b: Second cover rib 627b-6: Cover installation area 628c-6: Cover mounting groove 630, 630-1, 630-2: End caps 630a, 630a-6: First end cap 630b, 630b-6: Second end cap 631: Terminal Main Body Area 631a-6: First end main body region 631b-6: Second-end main body region 632a-6: First end protruding area 632b-6: Second end protruding area 633a-6: First end cap groove 633b-6: Second end cap groove 635: Connecting hole 640, 640-1, 640-2: Guide cover 640a-6: First guide cover 640b-6: Second guide cover 641a-6: First guiding main area 641b-6: Second Guiding Body Area 642a-6: First guiding protrusion area 642b-6: Second guiding protrusion area 643a-6: First guide cover groove 643b-6: Second guide cover groove 650, 650-1, 650-2: Connecting Body 650a: First connecting body 650b: Second connecting body 660-3, 660-4: Support body 660a-5: First support body 660b-5: Second Support 700: Internal fire-resistant components 710: Internal incision section 700-1: Sensing fire-resistant components 710-1: Sensing cut section 800: Blocking component 850: Cooling plate 860: Surface pressure component 900: External fire-resistant components 910: External incision portion 1000, 1000-1: Supporting components 1010: Supporting the main body of the partition 1020: Support cover 1030: First Support Cover 1040: Second support cover 1100: Battery pack 1200: Battery pack casing 1300: Battery pack cover F: Connecting component GF: Guided connecting component N: Nut component

Claims

1. A battery cell stack, comprising: Multiple battery cells are arranged along their width. as well as A separator is disposed between a pair of battery cells in one of the plurality of battery cells and is configured to separate the pair of battery cells. The separating member includes: A separator is disposed between the pair of battery cells and extends along the height direction; as well as A cover extends from the dividing body to opposite sides in the width direction to collectively cover the surface of the pair of battery cells on the side facing the height direction.

2. The battery cell stack according to claim 1, wherein the separating member further comprises: An end cap extending from the end cap to cover at least a portion of the pair of battery cells on one side along the length direction of the pair of battery cells.

3. The battery cell stack according to claim 2, wherein the separating member further comprises: A guide cover, which is disposed parallel to the end cover, to cover at least a portion of the pair of battery cells on one side of the pair of battery cells along their length.

4. The battery cell stack according to claim 3, wherein the separating member further comprises: A connecting body that connects the end cover and the guide cover, and whose thickness in the width direction is greater than the thickness of the separating body.

5. The battery cell stack of claim 4, wherein each of the pair of battery cells includes a cell lead portion extending toward said side in the length direction, and The connecting body protrudes from the separating body toward the lead portion of each of the pair of battery cells.

6. The battery cell stack of claim 5, wherein the connecting body is spaced apart from the cell lead portion of each of the pair of battery cells.

7. The battery cell stack according to claim 1, further comprising: An end plate is disposed on one side of the plurality of battery cells in the width direction; as well as A support member is disposed between the battery cell at the end of the plurality of battery cells in the width direction and the end plate, and is configured to cover one side of the battery cell at the end of the plurality of battery cells in the width direction.

8. The battery cell stack according to claim 7, wherein the support member is disposed parallel to the cover.

9. The battery cell stack according to claim 7, wherein the supporting member comprises: A supporting partition body is disposed between the battery cell located at the end in the width direction of the plurality of battery cells and the end plate and extends along the height direction; as well as A support cover that extends from the support partition body toward the cover.

10. The battery cell stack of claim 1, wherein the cover includes a cover vent formed on a region facing at least one of the pair of battery cells, or a cover cutout portion formed on a region facing at least one of the pair of battery cells and having a cutout shape or a thickness less than the thickness of the surrounding region, and in, The battery cell stack also includes an internal fire-resistant component disposed between the cover and at least one of the pair of battery cells, and includes an internal cut-out portion formed in the area facing the vent hole of the cover or the cut-out portion of the cover, having a cut-out shape or a thickness less than the thickness of the surrounding area.

11. The battery cell stack according to claim 1, further comprising: A sensing component includes a busbar electrically connected to the plurality of battery cells and a sensing frame supporting the busbar and having sensing holes formed in the region facing the plurality of battery cells; A sensing cover that covers the outside of the sensing component and includes a cover hole formed in the region facing the sensing hole; as well as A sensing fire-resistant component is disposed between the sensing assembly and the sensing cover, and includes a sensing cutout portion formed in the region facing the sensing hole and the cover hole, having a cutout shape or a thickness less than the thickness of the surrounding region.

12. The battery cell stack of claim 1, wherein the surface of the separator facing at least one of the pair of battery cells is formed of a thermally conductive material or a material that is thermally insulating or fire-resistant.

13. The battery cell stack according to claim 1, wherein the separating member comprises a first separating member and a second separating member disposed parallel to the first separating member, and in, The battery cell stack also includes a blocking member disposed between the separating member and at least one of the pair of battery cells separated by the separating member, or between the first separating member and the second separating member.

14. The battery cell stack according to claim 13, wherein the blocking member is formed of a material having thermal insulation or fire resistance or a material having thermal conductivity.

15. The battery cell stack according to claim 13, further comprising: A cooling plate is disposed between the first partition member and the second partition member to cool the first partition member and the second partition member.

16. The battery cell stack of claim 1, wherein each of the plurality of battery cells comprises: First electrode; The second electrode has a different polarity from the first electrode; A diaphragm is disposed between the first electrode and the second electrode; as well as The housing includes an encapsulation region surrounding the first electrode, the second electrode, and the separator, and an extension region extending from the encapsulation region toward one side of the battery cell along its length direction. The extended region bends toward one side of the width direction to cover the encapsulation region on one side of the length direction.

Images