Title of invention: battery module
Technical field
[One]
This application claims the benefit of priority based on Korean Patent Application No. 2018-0061360 filed May 29, 2018, and all contents disclosed in the documents of the Korean patent application are included as part of this specification.
[2]
The present invention relates to a battery module.
Background
[3]
Recently, as the demand for portable electronic devices such as notebook computers, smart phones, and tablet computers increases, research on high-performance secondary batteries capable of repetitive charging and discharging has been actively conducted.
[4]
In addition, secondary batteries are widely used not only for small devices such as portable electronic devices, but also for medium and large devices such as automobiles, robots, and satellites. In particular, as interest in fossil fuel depletion and environmental pollution increases, studies on hybrid vehicles and electric vehicles are actively being conducted. The most essential component in such a hybrid vehicle or electric vehicle is a battery pack that supplies power to a motor.
[5]
In the case of a hybrid vehicle or an electric vehicle, since driving power can be obtained from the battery pack, it has the advantage of superior fuel economy and no emission or reduction of pollutants compared to a vehicle that uses only an internal combustion engine.
[6]
A battery pack used in a hybrid vehicle or an electric vehicle includes a battery module including a plurality of battery cells, and as the plurality of battery cells are connected in series and/or parallel to each other, the capacity and output of the battery module are increased.
[7]
Recently, interest in a battery module having a pouch-type battery cell is increasing. Since the pouch-type battery cell uses an aluminum laminate sheet as an exterior material, there are advantages such as low weight, low manufacturing cost, and easy deformation.
[8]
As shown in FIGS. 1 to 3, a battery module according to the prior art includes a pouch-type battery cell 100. The battery cell 100 includes an electrode assembly 110, an electrode lead 120, and a pouch 130.
[9]
Hereinafter, for convenience of explanation, the length direction of the battery cell 100 is defined as the X-axis direction, the width direction of the battery cell 100 is defined as the Y-axis direction, and the thickness direction of the battery cell 100 is Z It is defined as the axial direction.
[10]
The electrode assembly 110 includes a plurality of electrode plates and a plurality of separators (separators) interposed between the plurality of electrode plates. The plurality of electrode plates includes at least one positive electrode plate and at least one negative electrode plate. Each electrode plate of the electrode assembly 110 is provided with an electrode tab 140. The electrode tab 140 is configured to protrude from the electrode plate to the outside.
[11]
The end (connection) of the electrode lead 120 is connected to the electrode assembly 110 through the electrode tab 140, and the opposite end of the connection part connected to the electrode assembly 110 is exposed to the outside of the pouch 130. The electrode lead 120 serves as an electrode terminal of the battery module. The electrode lead 120 includes an anode lead 121 and a cathode lead 122. The electrode leads 121 and 122 are electrically connected to the electrode assembly 110 through the electrode tab 140. The electrode leads 121 and 122 are connected to the electrode tab 140 by welding to the connection portion of the electrode tab 140.
[12]
Each of the plurality of electrode plates, that is, the positive electrode plate and the negative electrode plate, includes an electrode tab 140. The electrode tab 140 includes an anode tab 141 connected to the anode lead 121 and a cathode tab 142 connected to the cathode lead 122. A plurality of positive tabs 141 are connected to one positive lead 121, and a plurality of negative tabs 142 are connected to one negative lead 122.
[13]
The pouch 130 has a space for accommodating the electrode assembly 110 and an electrolyte solution therein. The pouch 130 includes a first pouch member 131 and a second pouch member 132. A concave accommodation groove 133 is formed in either of the first pouch member 131 and the second pouch member 132.
[14]
The first pouch member 131 and the second pouch member 132 are coupled to each other to form an accommodation space. The accommodation space is sealed by sealing the edges of the first pouch member 131 and the second pouch member 132 by thermal fusion or the like.
[15]
The pouch 130 includes an extension portion 135 extending from a portion where an accommodation space is formed, and the electrode lead 120 is drawn out from the extension portion 135.
[16]
In the battery module, a plurality of battery cells 100 are stacked in the Z-axis direction, while a plurality of electrode leads 120 drawn out from the plurality of battery cells 100 are externally disposed on one side of the plurality of battery cells 100. An outlet 190 to be withdrawn is provided.
[17]
In order for the plurality of electrode leads 120 drawn out from the plurality of battery cells 100 to be drawn out to the outside through the outlet 190, the plurality of electrode leads 120 are bent toward the outlet 190. However, when the plurality of electrode leads 120 are bent toward the outlet 190, the electrode leads 120 drawn out from any one of the plurality of battery cells 100 may be transferred to the plurality of battery cells ( 100) may be in contact with the extension part 135 extending from the other battery cell 100 (see part A of FIG. 3). When the electrode lead 120 and the extension part 135 contact each other, the extension part 135 may be corroded due to a reaction according to the electrical characteristics of the electrode lead 120 and the extension part 135. When the extension part 135 is corroded, the electrolyte contained in the pouch 130 may leak to the outside, so that electrical performance and safety of the battery cell 100 may be deteriorated.
[18]
To prevent this concern, in the prior art, an insulating tape 139 is provided on the extension part 135 of the pouch 130 to prevent direct contact between the electrode lead 120 and the extension part 135 of the pouch 130. ) Is attached.
[19]
However, as the process of attaching the insulating tape 139 is additionally required, there is a problem that the process of manufacturing the battery module becomes complicated. In addition, in order to attach the insulating tape to the pouch 130, a process of adjusting the position or posture of the electrode lead 120 or the pouch 130 is required, and the position or posture of the electrode lead 120 or the pouch 130 There is a problem in that the electrode lead 120 or the pouch 130 may be damaged in the process of adjusting.
Detailed description of the invention
Technical challenge
[20]
The present invention is to solve the problems of the prior art, and an object of the present invention is to provide a battery module capable of preventing contact between an electrode lead and an extension portion of a pouch extending from a plurality of battery cells adjacent to each other. There is.
Means of solving the task
[21]
A battery module according to an embodiment of the present invention for achieving the above object includes an electrode assembly including a plurality of electrode plates and a plurality of electrode tabs drawn out from the plurality of electrode plates, a pouch for accommodating the electrode assembly, and a plurality of A battery module comprising a plurality of battery cells sequentially stacked, each including an electrode lead that is connected to the electrode tab of the pouch and is extended from an extension of a pouch and is drawn out through an outlet, wherein the battery cells are adjacent to each other. In order to secure a gap between the extension portion of the pouch of one battery cell and the electrode lead of the other battery cell, the extension portion may include a bent portion that is bent at a predetermined angle with respect to a direction in which a plurality of battery cells are stacked. .
[22]
The extension portion may be bent in a first direction perpendicular to the extension direction of the extension portion and then bent in a second direction opposite to the first direction, so that the electrode lead may face the outlet.
[23]
The battery cell may further include a cover member extending from the extension part and disposed to surround the electrode lead.
[24]
After the extension portion is bent in a first direction perpendicular to the extension direction of the extension portion, the cover member is bent in a second direction opposite to the first direction, so that the electrode lead may face the outlet.
[25]
The plurality of extension portions of the plurality of battery cells may be bent at a plurality of positions spaced apart by a predetermined interval in the extension direction of the extension portion.
[26]
The plurality of extensions of the plurality of battery cells may be sequentially bent in the order in which the plurality of battery cells are stacked at a plurality of locations spaced apart by a predetermined interval in the extension direction of the extension.
[27]
When two positions adjacent to each other among the plurality of positions are referred to as a first position and a second position, the extension of any one of the plurality of battery cells is bent in a first direction perpendicular to the extending direction of the extension at the first position, and then, It is bent between the first position and the second position in a second direction opposite to the first direction, so that the electrode lead may face the outlet.
[28]
The battery cell further includes a cover member extending from the extension part and disposed to surround the electrode lead, and when two positions adjacent to each other among the plurality of positions are referred to as a first position and a second position, any one of the plurality of battery cells The extension portion of the first position is bent in a first direction perpendicular to the extending direction of the extension portion, and then the cover member is bent in a second direction opposite to the first direction between the first position and the second position, so that the electrode lead is taken out. Can face.
[29]
The bent portion of the extension portion may be positioned between the electrode assembly and the connection portion of the electrode lead connected to the plurality of electrode tabs, and a connection member made of a plastically deformable material may be disposed between the connection portion of the electrode lead and the electrode assembly.
[30]
The plurality of electrode tabs and electrode leads of the electrode assembly may be electrically connected through a connection member.
Effects of the Invention
[31]
According to the battery module according to an exemplary embodiment of the present invention, as the extended portion of the pouch of the battery cell is bent, it is possible to prevent the pouch of a plurality of battery cells adjacent to each other from contacting the electrode lead. Accordingly, since there is no need to attach the insulating tape to a portion where contact between the pouch and the electrode lead is concerned, problems caused by the process of attaching the insulating tape can be solved. In addition, since it is possible to prevent the pouch of a plurality of battery cells adjacent to each other from contacting the electrode lead, it is possible to prevent corrosion of the pouch, leakage of electrolyte, and the like caused by contact between the pouch and the electrode lead.
Brief description of the drawing
[32]
1 is a perspective view schematically illustrating a battery cell of a battery module according to the prior art.
[33]
2 is an exploded perspective view schematically showing a battery cell of a battery module according to the prior art.
[34]
3 is a side view schematically illustrating a state in which an electrode lead contacts an extended portion of a pouch in a state in which battery cells of a battery module according to the prior art are stacked.
[35]
4 is a side view schematically illustrating a state in which an extension portion of a pouch of a battery cell is bent in a state in which the battery cells of the battery module according to the first embodiment of the present invention are stacked.
[36]
5 is a schematic cross-sectional view of a battery cell of the battery module according to the first embodiment of the present invention.
[37]
6 is a perspective view schematically illustrating a battery cell of a battery module according to a second embodiment of the present invention.
[38]
7 is a side view schematically illustrating a state in which the extended portion of the pouch of the battery cell and the cover member are bent in a state in which the battery cells of the battery module according to the second exemplary embodiment are stacked.
[39]
8 is a schematic cross-sectional view of a battery cell of a battery module according to a second embodiment of the present invention.
[40]
9 is a schematic cross-sectional view of a battery cell of a battery module according to a third embodiment of the present invention.
Mode for carrying out the invention
[41]
Hereinafter, a battery module according to an embodiment of the present invention will be described with reference to the accompanying drawings.
[42]
4 and 5, the battery module according to the first embodiment of the present invention includes a pouch-type battery cell 200. The battery cell 200 may include an electrode assembly 210, an electrode lead 220, and a pouch 230.
[43]
Hereinafter, for convenience of description, the length direction of the battery cell 200 is defined as the X-axis direction, the width direction of the battery cell 200 is defined as the Y-axis direction, and the thickness direction of the battery cell 200 is Z It is defined as the axial direction.
[44]
The electrode assembly 210 may include a plurality of electrode plates and a plurality of separators (separators) interposed between the plurality of electrode plates. The plurality of electrode plates may include one or more positive plates and one or more negative plates. Each electrode plate of the electrode assembly 210 may be provided with an electrode tab 240. The electrode tab 240 may be configured to protrude from the electrode plate to the outside.
[45]
The end (connection) of the electrode lead 220 is connected to the electrode assembly 210 through the electrode tab 240, and the opposite end of the connection part connected to the electrode assembly 210 may be exposed to the outside of the pouch 230. have. The electrode lead 220 serves as an electrode terminal of the battery module.
[46]
The pouch 230 has a space for accommodating the electrode assembly 210 and the electrolyte solution therein. The pouch 230 may include a first pouch member 231 and a second pouch member 232.
[47]
The first pouch member 231 and the second pouch member 232 may be coupled to each other to form an accommodation space. The receiving space may be sealed by sealing the edges of the first pouch member 231 and the second pouch member 232 by thermal fusion or the like.
[48]
The pouch 230 includes an extension portion 235 extending from a portion where an accommodation space is formed, and an electrode lead 220 is drawn out from the extension portion 235.
[49]
While a plurality of battery cells 200 are stacked in the Z-axis direction, at one side of the plurality of battery cells 200, a plurality of electrode leads 220 drawn out from the plurality of battery cells 200 are drawn out to the outside ( 290) is provided.
[50]
In the battery module according to the first embodiment of the present invention, the electrode leads 220 of the plurality of battery cells 200 adjacent to each other among the plurality of battery cells 200 and the extension part 235 of the pouch 230 are In order to prevent contact, the extended portion 235 of the pouch 230 may be bent at a predetermined angle with respect to the direction in which the plurality of battery cells 200 are stacked (Z-axis direction). Accordingly, the extension portion 235 may have a bent portion (B).
[51]
As the extension portion 235 is bent at a predetermined angle with respect to the direction in which the plurality of battery cells 200 are stacked (Z-axis direction), the extension portion 235 of the plurality of battery cells 200 disposed adjacent to each other And since a sufficient gap can be secured between the electrode leads 220, the extension portion 235 and the electrode lead 220 can be prevented from contacting each other.
[52]
As shown in FIG. 4, the extension part 235 may be bent multiple times. That is, the extension portion 235 may include a plurality of bent portions (B). When the extension part 235 is bent multiple times, once the extension part 235 is bent in a first direction (-Z-axis direction) perpendicular to the extension direction (X-axis direction) of the extension part 235, the first The electrode lead 220 that is bent in a second direction opposite to the direction (+Z-axis direction) and is drawn out from the extension part 235 may face the outlet 290.
[53]
As shown in FIG. 5, a pair of molds 281 and 282 having a pressing surface having a shape corresponding to a shape in which the extension portion 235 is bent is extended by pressing both sides of the extension portion 235 A plurality of bent portions B may be formed at the same time in the portion 235.
[54]
In the bent part B, the extension part 235 and the electrode lead 220 may be coupled to each other. For example, the electrode lead 220 may be inserted into the extension part 235. The electrode lead 220 may be made of a metal such as copper. Accordingly, after the extension portion 235 and the electrode lead 220 are pressed by a pair of molds 281 and 282, the electrode lead ( As 220 is plastically deformed, the bent shape of the extension part 235 and the electrode lead 220 may be maintained.
[55]
As shown in FIG. 4, in a state in which a plurality of battery cells 200 are stacked in a direction perpendicular to the extension direction (X-axis direction) of the extension part 235 (Z-axis direction), the plurality of battery cells 200 ) Of the plurality of extension parts 235 may be bent at a plurality of positions C1, C2, and C3 spaced apart at predetermined intervals in the extension direction (X-axis direction) of the extension part 235. That is, the bent portions (B) of each of the plurality of extension portions 235 will be positioned at a plurality of positions (C1, C2, C3) spaced at predetermined intervals in the extension direction (X-axis direction) of the extension portion 235 I can.
[56]
At this time, at least some of the plurality of extension parts 235 may be bent in the same direction or in different directions at the plurality of positions C1, C2, and C3.
[57]
Meanwhile, the plurality of extension portions 235 of the plurality of battery cells 200 may be sequentially bent in the order in which the plurality of battery cells 200 are stacked in the extension direction (X-axis direction) of the extension portion 235. . That is, the bent portions B of each of the plurality of extension portions 235 of the plurality of battery cells 200 sequentially stacked are spaced apart at predetermined intervals in the extension direction (X-axis direction) of the extension portion 235 and sequentially Each of the plurality of positions C1, C2, and C3 may be sequentially located.
[58]
In addition, a plurality of positions (C1, C2, C3) that are spaced apart at predetermined intervals in the extending direction (X-axis direction) of the extension part 235 and are sequentially located are respectively a first position (C1) and a second position (C2) , When the third position (C3), one of the plurality of battery cells 100, one of the extension part 135 is bent in the first direction at the first position (C1), and then the first position (C1) and The electrode lead 120 may be bent in a second direction opposite to the first direction between the two positions C2 and face the outlet 190.
[59]
According to the battery module according to the first embodiment of the present invention as described above, as the extension portion 235 of the pouch 230 of the battery cell 200 is bent a plurality of times, a plurality of battery cells 200 adjacent to each other ) Of the pouch 230 and the electrode lead 220 may be prevented from coming into contact with each other. Accordingly, since there is no need to attach an insulating tape to a portion where contact between the pouch 230 and the electrode lead 220 is concerned, a problem caused by the process of attaching the insulating tape can be solved. In addition, since it is possible to prevent the pouch 230 and the electrode lead 220 of the plurality of battery cells 200 adjacent to each other from contacting each other, the pouch caused by contact between the pouch 230 and the electrode lead 220 Corrosion and leakage of electrolyte can be solved.
[60]
Hereinafter, a battery module according to a second embodiment of the present invention will be described with reference to FIGS. 6 to 8.
[61]
6 to 8, the battery module according to the second embodiment of the present invention includes a pouch-type battery cell 300. The battery cell 300 includes an electrode assembly 310, an electrode lead 320, a pouch 330, and a cover member 350 extending from the pouch 330 and covering a portion of the electrode lead 320. can do.
[62]
The cover member 350 may be disposed to surround the electrode lead 320 to protect the electrode lead 320. The cover member 350 is made of a material that does not cause an electrochemical reaction with the electrode lead 320 or the extension portion 335 even if the electrode lead 320 contacts the adjacent electrode lead 320 or the extension portion 335. I can. For example, the cover member 350 may be made of an insulating material. For example, the cover member 350 may be configured in the form of a film.
[63]
As shown in FIGS. 6 and 7, the extended portion 335 and the cover member 350 of the pouch 330 may be bent once, respectively. That is, the extension part 335 may be bent once. That is, the extension part 335 may have one bent part B1. In addition, the cover member 350 may also include one bent portion B2. In this case, the extension portion 335 is bent in a first direction (-Z axis direction) perpendicular to the extension direction (X-axis direction) of the extension portion 335, and then a cover member extending from the extension portion 335 350 may be bent in the second direction (+Z-axis direction) so that the electrode lead 320 faces the outlet 390. For example, when it is difficult to bend the extension part 335 a plurality of times, the cover member 350 may be bent to prevent the electrode lead 320 from contacting the adjacent extension part 335.
[64]
As shown in FIG. 8, a pair of molds 381 and 382 having a pressing surface having a shape corresponding to a shape in which the extension portion 335 and the cover member 350 are bent are provided with the extension portion 335 and the cover. By pressing the member 350, bent portions B1 and B2 may be simultaneously formed in the extension portion 335 and the cover member 350, respectively.
[65]
The extension portion 335 and the cover member 350 may be coupled to the electrode lead 320 in the bent portions B1 and B2. For example, the electrode lead 320 may be inserted into the extension part 335 and the cover member 350. The electrode lead 320 may be made of a metal such as copper, and accordingly, after the extension part 335, the cover member 350, and the electrode lead 320 are pressed by a pair of molds 381 and 382 Here, as the electrode lead 320 is plastically deformed, the extended portion 335, the cover member 350, and the bent shape of the electrode lead 320 may be maintained.
[66]
As shown in FIG. 7, in a state in which a plurality of battery cells 300 are stacked in a direction perpendicular to the extension direction (X-axis direction) of the extension part 335 (Z-axis direction), the plurality of battery cells 300 ) Of the plurality of extension parts 335 may be bent at a plurality of positions C1, C2, and C3 spaced apart at predetermined intervals in the extension direction (X-axis direction) of the extension part 335. That is, the bent portions B1 of each of the plurality of extension portions 335 may be positioned at a plurality of positions C1, C2, C3 spaced at predetermined intervals in the extension direction of the extension portion 335 (X-axis direction). I can.
[67]
At this time, at least some of the plurality of extension parts 335 may be bent in the same direction or in different directions at the plurality of positions C1, C2, and C3.
[68]
Meanwhile, the plurality of extension parts 335 of the plurality of battery cells 300 may be sequentially bent in the order in which the plurality of battery cells 300 are stacked in the extension direction (X-axis direction) of the extension part 335. . That is, the bent portions B1 of each of the plurality of extension portions 335 of the plurality of battery cells 300 sequentially stacked are spaced apart at predetermined intervals in the extension direction (X-axis direction) of the extension portion 335 and sequentially Each of the plurality of positions C1, C2, and C3 may be sequentially located.
[69]
In addition, a plurality of positions (C1, C2, C3) that are spaced apart at predetermined intervals in the extending direction (X-axis direction) of the extension part 335 and are sequentially located are respectively a first position (C1) and a second position (C2) , When the third position (C3), one of the plurality of battery cells 300, one of the extension portion 335 is bent in the first direction at the first position (C1), and then extends from the extension portion 335 The cover member 350 is bent in a second direction opposite to the first direction between the first position C1 and the second position C2, so that the electrode lead 320 may face the outlet 390.
[70]
According to the battery module according to the second embodiment of the present invention as described above, as the extension portion 335 of the pouch 330 of the battery cell 300 and the cover member 350 are bent, a plurality of adjacent It is possible to prevent contact between the pouch 330 of the battery cell 300 and the electrode lead 320. Therefore, since there is no need to attach the insulating tape to a portion where contact between the pouch 330 and the electrode lead 320 is concerned, a problem caused by the process of attaching the insulating tape can be solved. In addition, since it is possible to prevent the pouch 330 and the electrode lead 320 of the plurality of battery cells 300 adjacent to each other from contacting each other, the pouch generated due to the contact between the pouch 330 and the electrode lead 320 Corrosion and leakage of electrolyte can be solved.
[71]
Hereinafter, a battery module according to a third embodiment of the present invention will be described with reference to FIG. 9.
[72]
9, the battery module according to the third embodiment of the present invention includes a pouch-type battery cell 400. The battery cell 400 is disposed inside the electrode assembly 410, the electrode lead 420, the pouch 430, and the extension portion 435 of the pouch 430, and a connection member 460 capable of plastic deformation It may include.
[73]
The electrode lead 420 may not extend over the entire extension portion 435 and may be connected/coupled to only a part of the end portion of the extension portion 435. In this case, the bent portion B may be positioned between the electrode assembly 410 and a connection portion provided at an end of the electrode lead 420. That is, the electrode lead 420 may not be disposed inside the extension part 435 where the bent part B is located, but the connection member 460 may be disposed.
[74]
Although not shown, the electrode tab 440 extracted from the electrode assembly 410 may extend through the extension 435 and then be connected to a connection portion provided at an end of the electrode lead 420. The bent portion B of the extension portion 435 may be positioned between the connection portion of the electrode lead 420 and the electrode assembly 410. In this case, the connection member 460 may only serve to maintain the shape of the extension part 435 without electrical connection to the electrode tab 440 and/or the electrode lead 420. In this case, the connection member 460 may be made of a non-conductor.
[75]
As another example, as shown in FIG. 9, the connection member 460 may be made of a conductor, and the electrode tab 440 drawn out from the electrode assembly 410 is the electrode lead 420 through the connection member 460. It can be electrically connected to the connection of Accordingly, the bent portion B of the extension portion 435 may be positioned between the connection portion of the electrode lead 420 and the electrode assembly 410. The bent portion B of the extension portion 435 may be positioned at a portion where the connection member 460 is disposed.
[76]
As shown in FIG. 9, a pair of molds 481 and 482 having a pressing surface having a shape corresponding to a shape in which the extension portion 435 is bent, presses the extension portion 435, thereby extending the extension portion ( A plurality of bent portions B may be formed at the same time in 435.
[77]
Since the connecting member 460 made of a plastically deformable material is disposed in the bent portion B, after the extension portion 435 and the connecting member 460 are pressed by a pair of molds 481 and 482, the connection As the member 460 is plastically deformed, the bent shape of the extension part 435 and the connection member 460 may be maintained.
[78]
According to the battery module according to the third embodiment of the present invention as described above, since the connection member 460 made of a plastically deformable material is provided inside the extension portion 435 of the pouch 430, the extension portion 435 ) Or even when the electrode lead 420 is made of a material that is not plastically deformable, the bent shape of the extension portion 435 may be maintained. For example, even when the electrode lead 420 is made of a flexible conductor, the bent shape of the extension portion 435 may be maintained by the connection member 460.
[79]
The configuration in which the connection member 460 is provided may also be applied to the second embodiment of the present invention. According to this configuration, the bent shape of the extension part 335 and the cover member 350 may be maintained by a connection member capable of plastic deformation, not the electrode lead 320.
[80]
Although preferred embodiments of the present invention have been described exemplarily, the scope of the present invention is not limited to such specific embodiments, and may be appropriately changed within the scope described in the claims.
Claims
[Claim 1]
An electrode assembly including a plurality of electrode plates and a plurality of electrode tabs drawn out from the plurality of electrode plates, a pouch for accommodating the electrode assembly, and an outlet connected to the plurality of electrode tabs and extending from an extension of the pouch In a battery module including a plurality of battery cells sequentially stacked and each including an electrode lead drawn out through the battery cell, an extension of a pouch of one of a plurality of battery cells adjacent to each other and the other The battery module, wherein the extension portion includes a bent portion bent at a predetermined angle with respect to a direction in which the plurality of battery cells are stacked to secure a gap between the electrode leads of the battery cell.
[Claim 2]
The battery module of claim 1, wherein the extension part is bent in a first direction perpendicular to the extension direction of the extension part, and then bent in a second direction opposite to the first direction, so that the electrode lead faces the outlet. .
[Claim 3]
The battery module of claim 1, wherein the battery cell further comprises a cover member extending from the extension part and disposed to surround the electrode lead.
[Claim 4]
The method according to claim 3, wherein the extension portion is bent in a first direction perpendicular to the extension direction of the extension portion, and then the cover member is bent in a second direction opposite to the first direction, so that the electrode lead faces the outlet. Battery module.
[Claim 5]
The battery module according to claim 1, wherein the plurality of extension portions of the plurality of battery cells are bent at a plurality of positions spaced apart from each other by a predetermined interval in an extension direction of the extension portion.
[Claim 6]
The battery module as set forth in claim 1, wherein the plurality of extensions of the plurality of battery cells are sequentially bent at a plurality of positions spaced apart by a predetermined interval in the extension direction of the extension part in the order in which the plurality of battery cells are stacked. .
[Claim 7]
The method according to claim 5 or 6, wherein when two positions adjacent to each other among the plurality of positions are referred to as a first position and a second position, an extension of any one of the plurality of battery cells is an extension direction of the extension at the first position. And then bent in a first direction perpendicular to and then bent in a second direction opposite to the first direction between the first position and the second position, so that the electrode lead faces the outlet.
[Claim 8]
The method according to claim 5 or 6, wherein the battery cell further comprises a cover member extending from the extension part and disposed to surround the electrode lead, and two positions adjacent to each other among the plurality of positions are a first position and a second position. When d, the extension of any one of the plurality of battery cells is bent in a first direction perpendicular to the extension direction of the extension at the first position, and then the cover member is between the first position and the second position. And the electrode lead is bent in a second direction opposite to the first direction so that the electrode lead faces the outlet.
[Claim 9]
The connection of claim 1, wherein the bent part of the extension part is located between the connection part of the electrode lead connected to the plurality of electrode tabs and the electrode assembly, and a connection made of a plastically deformable material between the connection part of the electrode lead and the electrode assembly. Battery module, characterized in that the member is disposed.
[Claim 10]
The battery module of claim 9, wherein the plurality of electrode tabs of the electrode assembly and the electrode lead are electrically connected through the connection member.