Battery device

Abstract

Battery device comprising: a cell assembly in which a plurality of battery cells are stacked; a busbar assembly connected to one side of the cell assembly; and a cell guide extending from the busbar arrangement in the direction of the cell arrangement and partially facing both side surfaces of the cell arrangement.

Description

TECHNICAL FIELD

[0001] The disclosure disclosed in this document generally relates to a battery device. BACKGROUND

[0002] Unlike primary batteries, secondary batteries can be charged and discharged with electricity and can be used in various applications such as digital cameras, mobile phones, laptops, and hybrid vehicles. Secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-hydrogen batteries, and lithium secondary batteries.

[0003] Among these secondary batteries, lithium secondary batteries with high energy density and discharge voltage are being extensively studied. Recently, lithium secondary batteries have been used in the form of battery modules or battery packs, which connect a large number of flexible, pouch-like battery cells.

[0004] However, if a large number of battery cells are housed in a case and one battery cell expands, the other battery cells may be bent, which may lead to deterioration of the battery cells.

[0005] Accordingly, a method is needed to prevent the other battery cells from deteriorating even if a swelling phenomenon occurs. SUMMARY

[0006] According to one aspect of the disclosed technology, a battery device capable of preventing deterioration of a battery cell due to swelling may be provided.

[0007] The battery device of the disclosed technology can be widely used in electric vehicles, battery charging stations, and devices in the field of green technology, such as solar power generation and wind power generation using other types of batteries. Furthermore, a battery case of the disclosed technology can be used in green electric vehicles, hybrid vehicles, or the like to mitigate the effects of climate change by suppressing air pollution and greenhouse gas emissions.

[0008] A battery device according to the disclosed technology may include: a cell assembly in which a plurality of battery cells are stacked; a bus bar assembly connected to one side of the cell assembly; and a cell guide extending from the bus bar assembly toward the cell assembly and partially opposing both side surfaces of the cell assembly.

[0009] In one embodiment, the battery cell may include an electrode assembly housed in a casing, and the cell guide may be arranged in a position in which a portion of the cell guide is opposite the electrode assembly.

[0010] In one embodiment, the busbar assembly may comprise at least one busbar and an insulating frame to which the at least one busbar is fixedly connected, and the cell guide may extend from the insulating frame.

[0011] In one embodiment, the battery device may further comprise a fastening member that secures the cell guide to the insulation frame.

[0012] In one embodiment, the cell guide may be formed integrally with the insulating frame.

[0013] In one embodiment, the battery device may further comprise a reinforcing frame connecting the cell guide and the insulating frame.

[0014] In one embodiment, the reinforcement frame may be formed integrally with the cell guide or the insulation frame.

[0015] In one embodiment, the battery device may further comprise: a housing that houses the cell assembly; and a first buffer pad disposed between the cell assembly and the housing.

[0016] In one embodiment, the battery device may further comprise a second buffer pad disposed between the cell guide and the cell assembly.

[0017] In one embodiment, the first buffer pad and the second buffer pad may be formed from the same material.

[0018] In one embodiment, the thickness of the first buffer pad may correspond to the total thickness of the second buffer pad and the cell guide.

[0019] Furthermore, a battery device may include: a cell assembly in which a plurality of battery cells are stacked in a first direction; a bus bar assembly connected to a first side surface of the cell assembly, in which an electrode lead of the battery cell is arranged; a casing that accommodates the cell assembly and the bus bar assembly in a receiving space; and a cell guide that is arranged on both second side surfaces of the cell assembly in the first direction and partially reduces the receiving space of the casing.

[0020] In one embodiment, each of the battery cells may comprise an electrode assembly connected to the electrode lead, and the cell guide may be arranged in a position opposite a part of the electrode assembly to which the electrode lead is connected.

[0021] According to one embodiment of the disclosed technology, a surface pressure deviation that occurs on a surface of each battery cell when battery cells in a battery device are swollen can be minimized. Accordingly, the battery cell can be prevented from deteriorating or being damaged due to the surface pressure deviation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Certain aspects, features and advantages of the disclosed technology are illustrated in the following detailed description with reference to the accompanying drawings. Fig. 1 is a perspective view of a battery cell based on an embodiment of the disclosed technology. Fig. 2 is an exploded perspective view of the Fig. 1 shown battery cell. Fig. 3 is an exploded perspective view of a battery device based on an embodiment of the disclosed technology. Fig. 4 is a plan view of the Fig. Battery device shown in Figure 3. Fig. 5 is an exploded perspective view of the Fig. 3 shown insulation frame and cell guide. Fig. 6 is a plan view of the Fig. 4, showing a state in which swelling of the battery cell has occurred. Fig. 7 is an exploded perspective view of a battery device based on another embodiment of the disclosed technology. DETAILED DESCRIPTION

[0023] The disclosed technology is described in detail below with reference to the attached drawings.

[0024] Fig. 1 is a perspective view of a battery cell based on an embodiment of the disclosed technology, and Fig. 2 is an exploded perspective view of the Fig. 1 shown battery cell.

[0025] Referring to Fig. 1 and Fig. 2, a battery cell 10 according to one embodiment may include an electrode assembly 230 and a housing 210 for receiving the electrode assembly 230.

[0026] The battery cell 10 according to one embodiment is a rechargeable battery and may include a lithium-ion (Li-ion) battery. Because the lithium-ion battery has a large capacity per unit volume, the lithium-ion battery can be used as a power source for electric vehicles (EVs) or hybrid vehicles (HEVs) and can also be used in devices in various fields, such as energy storage.

[0027] The electrode assembly 230 is a member in which a plurality of electrodes are stacked, and may be formed in an approximately hexahedral shape and may be accommodated together with an electrolyte in a receiving space 213 of the housing 210.

[0028] Housing 210 may be formed from a flexible film material. For example, housing 210 may be formed from a material that insulates a surface of a thin metal film containing aluminum.

[0029] The housing 210 may be provided with a receiving space 213 in which the electrode assembly 230 is housed. Additionally, an electrode lead 220 may be arranged protruding from the outside of the housing 210.

[0030] As in Fig. As shown in Figure 2, the battery cell 10 of one embodiment can seal the receiving space 213 after a single sheet of the outer material is folded and three side surfaces are bonded together. Accordingly, the housing 210 of one embodiment can be divided into a first housing 210a and a second housing 210b based on a fold line C where the outer material is folded.

[0031] Specifically, the battery cell 10 of one embodiment can be manufactured by forming a receiving space 213 in the outer material by press processing or the like, accommodating the electrode assembly 230 in the receiving space 213, folding the outer material along the fold line C, and then sealing the receiving space 213 by joining the edges where the first housing 210a and the second housing 210b meet. A heat-fusion method can be used as the method for joining the edges, but the disclosed technology is not limited thereto.

[0032] Hereinafter, a portion where the electrode assembly 230 is housed is referred to as a receiving portion 214, and a peripheral portion where the outer material is bonded is referred to as a sealing portion 215. Depending on the manufacturing method, in the battery cell 10 of one embodiment, the sealing portion 215 may not be arranged on a side surface 216 (hereinafter referred to as a folding surface) formed by folding the outer material.

[0033] In one embodiment, the sealing portion 215 may be divided into a first sealing portion 215a formed in a portion where the electrode line 220 is arranged, and a second sealing portion 215b formed in a portion where the electrode line 220 is not arranged.

[0034] Here, the battery cell 10 of this embodiment may be provided with the accommodation space 213 in each of the first housing 210a and the second housing 210b. However, the structure of the disclosed technology is not limited to this, and various modifications, such as providing the accommodation space 213 in only one of the first housing 210a and the second housing 210b, may be possible.

[0035] Additionally, an electrode tab 235 may be disposed between the electrode assembly 230 and the sealing portion 215. The electrode tab 235 may electrically connect the electrode assembly 230 and the electrode lead 220, and a plurality of electrode tabs 235 may extend from the electrode assembly 230 and be connected to at least one electrode lead 220.

[0036] The electrode line 220 may include a cathode line and an anode line. At least a portion of the electrode line 220 may protrude from the housing 210, and the electrode assembly 230 may be electrically connected to external elements via the electrode line 220.

[0037] Fig. 3 is an exploded perspective view of a battery device based on an embodiment of the disclosed technology, and Fig. 4 is a plan view of the Fig. 3 shown battery device. In Fig. 4, a second housing 40 is not shown for reasons of clarity.

[0038] With reference to Fig. 3 and Fig. 4 together, a battery device 100 of an embodiment may include a cell assembly 1 in which a plurality of battery cells 10 are stacked, a bus bar assembly 70 connected to one side of the cell assembly 1, and a cell guide 80 extending from the bus bar assembly 70 toward the cell assembly 1 and arranged to partially oppose both side surfaces of the cell assembly 1.

[0039] In this embodiment, the cell assembly 1 may be formed by stacking a plurality of battery cells 10 in a first direction, and the bus bar assembly 70 may be coupled to a first side surface of the cell assembly 1, in which the electrode lead 220 of the battery cell 10 is arranged. Additionally, the battery device 100 may include a housing 30 that accommodates the cell assembly 1 and the bus bar assembly 70 within the accommodation space 213, and the cell guide 80 may be arranged on both second side surfaces of the cell assembly 1 in the first direction and partially reduce the accommodation space 213 of the housing 30.

[0040] Each of the battery cells 10 may be a pouch-type secondary battery, and the electrode leads 220 may be formed to be oriented in opposite directions. The battery cell 10 constructed in this manner is a secondary battery that can be repeatedly charged and discharged, and may be a lithium (Li) battery or a nickel-metal hydride (Ni-MH) battery.

[0041] The cell arrangement 1 can be accommodated in the housing 30.

[0042] The housing 30 can determine the external shape of the battery device 100, surround the cell arrangement 1 and protect the battery cells 10 from external influences.

[0043] To facilitate the manufacture of the battery device 100, the housing 30 may be divided into several parts. For example, the housing 30 of one embodiment may include a first housing 50 disposed on one side (e.g., a bottom side) of the cell assembly 1, a second housing 40 disposed on the other side (e.g., a top side) of the cell assembly 1, and a third housing 60 disposed on a side surface on which the electrode leads 220 of the battery cells 10 are disposed.

[0044] The first housing 50 may include a bottom plate 52 disposed at a lower portion of the cell assembly 1 to support a lower surface of the cell assembly 1, and a side plate 58 supporting the side surface of the cell assembly 1. The side plate 58 may support both side surfaces of the cell assembly 1 where the electrode leads 220 are not disposed.

[0045] The side plate 58 may be formed by extending from both sides of the bottom plate 52, and may support the battery cells 10 stacked on both side surfaces of the cell assembly 1 in the left and right directions.

[0046] The second housing 40 may be arranged at an upper part of the cell assembly 1 and connected to the first housing 50. The second housing 40 may be in the form of a flat plate and may be attached to an upper end of the side plate 58 of the first housing 50.

[0047] The first housing 50 and the second housing 40 may be joined together by welding or the like. However, the disclosed technology is not limited to this, and various modifications may be made, such as a sliding connection or a connection using a fastener such as a bolt or a screw.

[0048] The first housing 50 and the second housing 40 constructed in this manner may be made of a material with high thermal conductivity and rigidity, such as a metal.

[0049] In this embodiment, a case where the side plate 58 is integrated into the first housing 50 is exemplified, but this embodiment is not limited thereto, and the second housing 40 may include the side plate 58 as needed.

[0050] The third housings 60 can each be connected to both side surfaces of the cell assembly 1, in which the electrode lines 220 are arranged. The third housings 60 can be coupled to the first housing 50 and the second housing 40 to form an overall assembly of the battery device 100 together with the first housing 50 and the second housing 40.

[0051] The third housings 60 may be coupled to the first housing 50 and the second housing 40 using a fastener such as a screw or bolt, or by welding, bonding, or the like. However, the structure of the disclosed technology is not limited thereto.

[0052] In one embodiment, the third housings 60 may be formed of a metal material. However, this embodiment is not limited thereto, and part or all of the third housings 60 may also be formed of an insulating material such as a resin, as needed.

[0053] The busbar arrangement 70 can be arranged between the third housing 60 and the cell arrangement 1.

[0054] The busbar assembly 70 may be arranged on a side surface on which the electrode lines 220 of the battery cells 10 are arranged and may be coupled to the cell assembly 1, and for this purpose may comprise at least one busbar 77 and at least one insulating frame 71.

[0055] The insulating frame 71 may be formed from an insulating material, and the at least one busbar 77 may be fixedly coupled to a surface of the insulating frame 71. The electrode leads 220 of the battery cells 10 may penetrate the insulating frame 71 and be connected to the busbar 77, so that the battery cells 10 can be electrically connected to one another via the busbar 77.

[0056] Additionally, the battery device 100 of one embodiment may include a cell guide 80 extending from the insulation frame 71.

[0057] Fig. 5 is an exploded perspective view of the Fig. 3 and the cell guide, and when the drawings are considered together, the cell guide 80 may be arranged in a shape extending from an edge of the insulating frame 71 toward the battery cell 10, and at least a part thereof may correspond to the receiving portion 214 (see Fig. 1) of the battery cell 10. In particular, the cell guide 80 may be fixedly connected to the insulating frame 71 or formed integrally with the insulating frame 71 and may be designed to face the receiving section 214 of the battery cells 10a (see Fig. 4, hereinafter referred to as outer cells) arranged on an outermost side among the plurality of battery cells 10 forming the cell assembly 1.

[0058] Accordingly, the cell guide 80 can be coupled to both side surfaces of the insulating frame 71 and can also be arranged so that it faces two outer cells 10a which form both side surfaces of the cell arrangement 1.

[0059] The cell guide 80 of one embodiment may be arranged in a position where a portion thereof faces the electrode assembly 230 of the outer cell 10a. In this case, the cell guide 80 may be arranged in a position such that it faces a portion of the electrode assembly to which the electrode lead 220 is connected, and may be arranged so that it does not face a center of the battery cell 10.

[0060] For example, when the receiving portion 214 is divided into a plurality of regions, e.g., N equal parts (where N is an integer greater than or equal to 3), in a longitudinal direction of the battery cell 10, the cell guide 80 may be arranged to oppose, among the plurality of regions, a region where the electrode lead 220 is connected to the electrode assembly 230. Here, all of the plurality of regions may be divided to partially contain the electrode assembly 230.

[0061] The cell guide 80 of one embodiment may be formed as a rectangular plate and arranged to be in close contact with the receiving portion 214 of the outer cell 10a. However, the disclosed technology is not limited to this. For example, if the expansion of the cell assembly 1 in the first direction is partially suppressed, the cell guide 80 may be converted into various shapes.

[0062] The battery device 100 of one embodiment may include a fastener 87 that secures the cell guide 80 to the insulation frame 71. The fastener 87 may comprise a screw or a bolt in this embodiment. However, the cell guide 80 of the disclosed technology is not limited thereto and may be configured to be slidably or fittingly coupled to the insulation frame 71. Furthermore, the cell guide 80 and the insulation frame 71 may be integrally formed, as in another embodiment described below.

[0063] In one embodiment, the cell guide 80 may be formed of an insulating material, such as a resin. For example, the cell guide 80 may be formed of the same material as the insulating frame 71. However, the disclosed technology is not limited to this, and the cell guide 80 may also be formed of a metal material or a metal material with an insulating layer formed on a surface, as needed.

[0064] A first buffer pad 91 may be disposed between the cell assembly 1 and the housing 30. The first buffer pad 91 may be disposed, for example, in an area of ​​an outer surface of the outer cell 10a that does not face the cell guide 80. The first buffer pad 91 may be disposed to prevent the battery cell 10 from being damaged by the housing 30 when the battery cell 10 comes into direct contact with the housing 30.

[0065] Furthermore, the first buffer pad 91 can be compressed to a certain thickness as the battery cell 10 expands, and can accommodate a larger volume of the battery cell 10. For this purpose, the first buffer pad 91 can be formed from a material that is compressed to a certain thickness and elastically deformed by an external force. The first buffer pad 91 can be formed from, for example, a foam-like material such as polyurethane foam (PU foam), but is not limited thereto.

[0066] Furthermore, the first buffer pad 91 can be inserted and arranged between the battery cells 10. Accordingly, even if a battery cell 10 expands, an increase in the overall volume of the battery device 100 can be minimized.

[0067] A second buffer pad 92 may be disposed between the cell guide 80 and the outer cell 10a. The second buffer pad 92 may be disposed to prevent the battery cell 10 from being damaged by the cell guide 80 while directly contacting the cell guide 80.

[0068] The second buffer pad 92 may be formed of the same material as the first buffer pad 91, but is not limited thereto, but may be formed of a variety of materials as long as it can be elastically compressed at a certain thickness and protects the battery cell 10.

[0069] The first buffer pad 91 may be thicker than the second buffer pad 92. For example, the thickness of the first buffer pad 91 may be equal to the total thickness of the second buffer pad 92 and the cell guide 80.

[0070] The first buffer pad 91 and the second buffer pad 92 can be manufactured and used separately or in one piece.

[0071] The battery device 100 constructed in this way can suppress expansion according to a stacking direction of the cell assembly 1 by the cell guide 80. This will be described in more detail below.

[0072] Fig. 6 shows the Fig. 4 in a state where swelling occurs in the battery cell 10.

[0073] As from Fig. As can be seen from Figure 6, when the battery device 100 swells, different surface pressures can occur at the surface S (see Fig. 1 and Fig. 2) of the battery cell 10. Here, the surface S of the battery cell 10 is a surface arranged in the thickness direction of the battery cell 10 and may refer to a surface that is in contact with or opposite to other battery cells 10 arranged in parallel. For example, the surface S of the battery cell 10 may be understood as a surface arranged in a direction facing the side plate 58 of the housing 30.

[0074] For example, when a battery cell 10b (hereinafter referred to as the first cell) that has undergone swelling is expanded among the battery cells 10 constituting the cell array 1, the surface S of the first cell 10b is expanded mainly in the center rather than at both ends. Furthermore, other battery cells 10c (hereinafter referred to as the second cell) stacked and arranged on both sides of the first cell 10b may be compressed and bent by the pressure exerted by the expanded first cell 10b.

[0075] When the center of the first cell 10b is expanded, the surface pressure exerted on the center of the surface S of a second cell 10c within the housing can increase significantly. On the other hand, since the two ends of the surface S of the first cell 10b do not experience a large volume change compared to their center, the surface pressure exerted on both ends of the second cells 10c can only increase slightly. As a result, a relatively lower surface pressure can be exerted on both ends of the second cells 10c than on their center.

[0076] Accordingly, a deviation in the surface pressure exerted on the second cells 10c occurs, and this surface pressure imbalance can lead to deterioration of the battery cell 10. For example, if the surface pressure at both ends of the battery cell 10 is weaker than at the center, the current density increases at both ends of the battery cell 10 where the surface pressure is weak, which can cause lithium to deposit at both ends. Furthermore, the precipitated lithium can form lithium dendrites and destroy the separator.

[0077] On the other hand, in the case of providing a cell guide 80, as in this embodiment, both ends of the battery cell 10 corresponding to the cell guide 80 are prevented from expanding in the stacking direction of the battery cell 10. That is, the cell guide 80 of this embodiment can define a smaller space in which both ends of the cell assembly 1 can be expanded than a space in which the center of the cell assembly 1 can be expanded.

[0078] Accordingly, when the center and both ends of the first cell 10b expand with the same volume, the surface pressure exerted on both ends of the second cell 10c can be greater because the space is limited. Accordingly, in the case of the cell guide 80 of this embodiment, even if the volume of the center of the first cell 10b increases more than that of its two ends, a deviation between the surface pressures exerted on the center and both ends of the second cell 10c can be minimized.

[0079] The battery device 100 of this embodiment described above can suppress local lifting of both ends of the battery cell 10 during battery swelling by using the cell guide 80, thus minimizing surface pressure deviation. Thus, the battery device 100 can prevent the battery cells 10 from being degraded or damaged due to surface pressure deviation.

[0080] Embodiments of the disclosed technology are further described below. Inventive examples and comparative examples included in experimental examples are merely illustrative of the disclosed technology and do not limit the scope of the appended claims. It is obvious to those skilled in the art that various changes and modifications to embodiments are possible within the scope and technical idea of ​​the disclosed technology, and it is understood that such changes and modifications fall within the scope of the appended claims.

[0081] Fig. 7 is an exploded perspective view of a battery device based on another embodiment of the disclosed technology.

[0082] As in Fig.As shown in Figure 7, in one embodiment, the cell guide 80 may be formed integrally with the insulating frame 71. The cell guide 80 may be manufactured together with the method for manufacturing the insulating frame 71. In this case, the cell guide 80 may be formed from the same material as the insulating frame 71, and the above-described fastening element 87 may be omitted.

[0083] Additionally, the battery device 100 of this embodiment may include a reinforcement frame 85 that connects the cell guide 80 and the insulating frame 71. A plurality of reinforcement frames 85 of this embodiment may be coupled to the cell guides 80 and include an upper frame 85a connecting an upper end of the cell guide 80 and an upper end of the insulating frame 71, and a lower frame 85b connecting a lower end of the cell guide 80 and a lower end of the insulating frame 71. However, this embodiment is not limited to this, and the reinforcement frame 85 of this embodiment may be configured to include only one of the upper frame 85a and the lower frame 85b.

[0084] The reinforcement frame 85 may be provided to prevent the cell guide 80 from being excessively deformed due to the expansion pressure in the stacking direction of the cell assembly 1 when the cell assembly 1 is expanded. For this purpose, the reinforcement frame 85 may be connected to the entire upper (or lower) end of the cell guide 80 on one side and arranged so that a part thereof faces the receiving portion 214 of the battery cells 10 included in the cell assembly 1.

[0085] The reinforcement frame 85 may be formed integrally with the cell guide 80 or the insulating frame 71. For example, the reinforcement frame 85 and the cell guide 80 may be formed integrally with the insulating frame 71. However, the disclosed technology is not limited to this, and various modifications are possible, such as separately manufacturing the reinforcement frame 85, the insulating frame 71, and the cell guide 80, and then joining them together. Furthermore, it is also possible to configure the two upper frames 85a to be connected to each other and the two lower frames 85b to be connected to each other.

[0086] The battery device 100 of this embodiment described above can prevent the cell guide 80 from deforming when the battery cell 10 swells by the reinforcing frame 85.

[0087] (Aspect 1) A battery device may include: a cell assembly in which a plurality of battery cells are stacked; a bus bar assembly connected to one side of the cell assembly; and a cell guide extending from the bus bar assembly toward the cell assembly and partially opposing both side surfaces of the cell assembly.

[0088] (Aspect 2) The battery device according to aspect 1, wherein the battery cell may include an electrode assembly housed in a case, and the cell guide may be arranged in a position where a part of the cell guide is opposed to the electrode assembly.

[0089] (Aspect 3) The battery device according to any one of aspects 1 to 2, wherein the bus bar assembly may include at least one bus bar and an insulating frame to which the at least one bus bar is fixedly connected, and wherein the cell guide may extend from the insulating frame.

[0090] (Aspect 4) The battery device according to aspect 4 may further comprise a fixing member for fixing the cell guide to the insulating frame.

[0091] (Aspect 5) The battery device according to any one of aspects 3 to 4, wherein the cell guide may be formed integrally with the insulating frame.

[0092] (Aspect 6) The battery device according to any one of aspects 3 to 4, wherein the battery device may further comprise a reinforcing frame that connects the cell guide and the insulating frame to each other.

[0093] (Aspect 7) The battery device according to aspect 6, wherein the reinforcing frame may be formed integrally with the cell guide or the insulating frame.

[0094] (Aspect 8) The battery device according to any one of aspects 1 to 7, wherein the battery device may further comprise: a case that accommodates the cell assembly; and a first buffer pad disposed between the cell assembly and the case.

[0095] (Aspect 9) The battery device according to aspect 8, wherein the battery device may further comprise a second buffer pad disposed between the cell guide and the cell assembly.

[0096] (Aspect 10) The battery device according to aspect 9, wherein the first buffer pad and the second buffer pad may be formed of the same material.

[0097] (Aspect 11) The battery device according to any one of aspects 9 to 10, wherein the thickness of the first buffer pad may correspond to the total thickness of the second buffer pad and the cell guide.

[0098] (Aspect 12) The battery device according to any one of aspects 1 to 7, wherein the battery device may further comprise a housing that accommodates the cell assembly and the bus bar assembly in a receiving space, wherein the plurality of battery cells are stacked in a first direction and the cell guide is arranged on both second side surfaces of the cell assembly in the first direction and partially reduces the receiving space of the housing.

[0099] (Aspect 13) The battery device according to aspect 12, wherein each of the battery cells may include an electrode assembly connected to the electrode lead, and the cell guide may be arranged in a position opposite to a part of the electrode assembly to which the electrode lead is connected.

Claims

[1] Battery device comprising: a cell assembly in which a plurality of battery cells are stacked; a busbar assembly connected to one side of the cell assembly; and a cell guide extending from the busbar arrangement in the direction of the cell arrangement and partially facing both side surfaces of the cell arrangement. [2] The battery device according to claim 1, wherein the battery cell comprises an electrode assembly housed in a casing, and the cell guide is arranged in a position in which a part of the cell guide faces the electrode assembly. [3] Battery device according to one of claims 1 to 2, wherein the bus bar assembly comprises at least one bus bar and an insulating frame to which the at least one bus bar is fixedly connected, and the cell guide extends from the insulating frame. [4] The battery device according to claim 3, further comprising a fixing member that fixes the cell guide to the insulating frame. [5] Battery device according to one of claims 3 to 4, wherein the cell guide is formed integrally with the insulating frame. [6] A battery device according to any one of claims 3 to 4, further comprising: a reinforcement frame that connects the cell guide and the insulation frame. [7] The battery device according to claim 6, wherein the reinforcing frame is formed integrally with the cell guide or the insulating frame. [8] A battery device according to any one of claims 1 to 7, further comprising a housing that houses the cell assembly; and a first buffer pad disposed between the cell assembly and the housing. [9] The battery device of claim 8, further comprising a second buffer pad disposed between the cell guide and the cell assembly. [10] The battery device according to claim 9, wherein the first buffer pad and the second buffer pad are formed of the same material. [11] The battery device according to any one of claims 9 to 10, wherein the thickness of the first buffer pad corresponds to the total thickness of the second buffer pad and the cell guide. [12] A battery device according to any one of claims 1 to 7, further comprising: a housing which accommodates the cell arrangement and the busbar arrangement in a receiving space, wherein the plurality of battery cells are stacked in a first direction, and the cell guide, which is arranged on both side surfaces of the cell assembly in the first direction, partially reduces the receiving space of the housing. [13] The battery device according to claim 12, wherein each of the battery cells comprises an electrode assembly connected to the electrode lead, and the cell guide is arranged in a position opposite to a portion of the electrode assembly to which the electrode lead is connected.

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