Cap plate assembly, method for manufacturing cap plate assembly, and battery cell comprising same

Abstract

The present invention relates to a cap plate assembly, a method for manufacturing the cap plate assembly, and a battery cell comprising same, and may comprise: a cap plate which is formed to cover the top of a housing, and which has a first accommodation hole at least partially penetrated such that the inside and the outside of the housing communicate with each other; and a first electrode unit coupled to a first through-hole at the upper and lower portions of the cap plate, wherein the first electrode unit includes: a first terminal plate loaded and provided on the upper portion of the cap plate; a first insulating part formed to separate the first terminal plate from the cap plate; a first electrode terminal inserted into and coupled to the first through-hole such that a current flows from the inside of the housing to the first terminal plate; and a first sub-plate connected to the lower portion of the first electrode terminal.

Description

Cap plate assembly, method for manufacturing cap plate assembly, and battery cell including same

[0001] The present invention relates to a cap plate assembly, a method for manufacturing the cap plate assembly, and a battery cell including the same, and more particularly, to a cap plate assembly used in a secondary battery, a method for manufacturing the cap plate assembly, and a battery cell including the same.

[0002] Secondary batteries, which are generally used in electric vehicles and hybrid vehicles that consume a lot of power, require long-term operation and high-power operation. Accordingly, they are used in the form of battery modules in which multiple batteries are electrically connected using bus bars and bundled into one unit. In addition, they can be used in the form of a single battery depending on the type of external device to which they are applied, such as mobile devices and uninterruptible power supplies.

[0003] Fuel cells used in electric vehicles, hybrid vehicles, etc. are preferred as battery modules due to issues with output and capacity, and battery modules can increase output voltage or output current depending on the number of built-in batteries.

[0004] The secondary battery is installed with the electrode terminal penetrating the cap plate, and at this time, there is a problem that the electrolyte, etc. leaks out in the area between the cap plate and the electrode terminal when an abnormality occurs in the secondary battery.

[0005] Therefore, there is a problem in that an excessive number of required parts are generated by installing a gasket, etc. to prevent electrolyte leakage between the cap plate and the electrode terminal, and it is difficult to effectively prevent electrolyte leakage.

[0006] In addition, when the electrodes of the positive terminal portion and the negative terminal portion are formed of different metals, a bond between dissimilar metals may be formed between the positive terminal portion and the bus bar, or between the negative terminal portion and the bus bar.

[0007] However, the bonding between these conventional dissimilar metals is not easy to bond, the process is complicated, and even after bonding, the resistance value is high, so there are problems in that the efficiency of transmitting power inside the secondary battery to the outside is low.

[0008] The present invention aims to solve various problems including the above-described problems, and provides a cap plate assembly, a method for manufacturing the cap plate assembly, and a battery cell including the same, which can effectively prevent electrolyte leakage between the cap plate and the electrode terminal, simplify the process steps, and reduce resistance from the electrode assembly to the bus bar and increase power transmission efficiency. However, these tasks are exemplary and the scope of the present invention is not limited thereby.

[0009] According to one embodiment of the present invention, a cap plate assembly is provided. The cap plate assembly comprises: a cap plate formed to cover an upper portion of a housing and having a first receiving hole formed through at least a portion thereof so that the inside and the outside of the housing communicate with each other; and a first electrode portion coupled to the first through-hole at upper and lower portions of the cap plate; wherein the first electrode portion comprises: a first terminal plate formed of a first material and installed to be seated on an upper portion of the cap plate so as to be connected to a bus bar on the outside of the housing; a first terminal seating portion formed on an upper portion of the first terminal plate, a first through-hole formed inside the first receiving hole, and a first insulating portion formed to space the first terminal plate and the cap plate apart; The cap plate may include a first electrode terminal formed by laminating the first material and a second material different from the first material in the width or length direction, and inserted into the first through hole and coupled so as to conduct current from the inside of the housing to the first terminal plate; and a first sub-plate formed of the second material and connected so as to conduct current with the first electrode terminal, and connected to a lower portion of the first electrode terminal.

[0010] According to one embodiment of the present invention, the first insulating portion may be formed by insert injection into the cap plate and the first terminal plate so as to be formed between the cap plate and the first terminal plate.

[0011] According to one embodiment of the present invention, the first electrode terminal may include a core portion formed of the first material and having an upper surface joined to the first terminal plate; and a clad portion formed of the second material and formed to surround an outer surface of the core portion and having a lower surface joined to the first sub-plate.

[0012] According to one embodiment of the present invention, the first terminal plate and the core portion may be joined by welding, and the clad portion and the first subplate may be joined by direct bonding.

[0013] According to one embodiment of the present invention, the first electrode terminal may include an inner core portion formed of the first material and having an upper surface joined to the first terminal plate; a clad portion formed of the second material and formed to surround an outer surface of the core portion; and a flat base portion joined to the core portion and a lower portion of the clad portion.

[0014] According to one embodiment of the present invention, at least a portion of the circumference of the clad portion may be welded on the upper portion of the base portion, so that the base portion and the clad portion may be joined.

[0015] According to one embodiment of the present invention, the joining of the first terminal plate and the core portion, and the joining of the base portion and the first sub-plate can be joined by welding.

[0016] According to one embodiment of the present invention, a third insulating member may be formed by being joined to the lower portion of the cap plate to support the first sub-plate.

[0017] According to one embodiment of the present invention, a method for manufacturing a cap plate assembly is provided. The method for manufacturing the cap plate assembly comprises the steps of: (a) preparing a cap plate formed to cover an upper portion of a housing and having a first receiving hole formed through at least a portion of the cap plate so as to communicate the inside and the outside of the housing; (b) installing a first terminal plate formed of a first material and installed on an upper portion of the cap plate so as to be connected to a bus bar from an outer side of the housing, and forming a first insulating portion having a first through hole extending vertically and vertically while spacing the first terminal plate from the cap plate; (c) preparing a first electrode terminal formed by stacking the first material and a second material different from the first material in a width or length direction of the cap plate; (d) joining a lower portion of the first electrode terminal to a first sub-plate formed of the second material and formed to conduct current with the first electrode terminal; (e) a step of inserting the first electrode terminal into the first through hole and bonding the first terminal plate to the upper portion of the first electrode terminal so that the first terminal plate is energized from the electrode assembly inside the housing;

[0018] According to one embodiment of the present invention, in the step (b), the cap plate and the first terminal plate may be insert-molded to form the first insulating portion so that the first insulating portion is formed between the cap plate and the first terminal plate.

[0019] According to one embodiment of the present invention, the step (c) may include: (c-1) preparing a core material portion formed of the first material and extended by a predetermined length in the longitudinal direction so as to be joined to the first terminal plate; (c-2) connecting the core material portion to be wrapped around the circumference with a clad portion formed of the second material so as to be joined to the first sub-plate; and (c-3) cutting the core material portion wrapped with the clad portion in a direction perpendicular to the longitudinal direction to form a first electrode terminal.

[0020] According to one embodiment of the present invention, in the step (d), the first sub-plate and the first electrode terminal may be joined by direct bonding, and in the step (e), the first terminal plate and the core portion may be joined by welding.

[0021] According to one embodiment of the present invention, the step (c) may include: (c-1) preparing a core material portion formed of the first material and formed to extend a predetermined length in the longitudinal direction so as to be joined to the first terminal plate; (c-2) connecting the core material portion to surround the circumference thereof with a clad portion formed of the second material so as to be joined to the first sub-plate; (c-4) cutting the core material portion wrapped with the clad portion in a direction perpendicular to the longitudinal direction; and (c-5) forming a first electrode terminal by joining a flat base portion to the lower portion of the cut core material portion and the clad portion.

[0022] According to one embodiment of the present invention, in the step (c-5), at least a portion of the circumference of the clad portion is welded on the upper portion of the base portion, so that the base portion and the clad portion can be joined.

[0023] According to one embodiment of the present invention, in the step (d), the first sub-plate and the base portion may be joined by welding, and in the step (e), the first terminal plate and the core portion may be joined by welding.

[0024] According to one embodiment of the present invention, the step (c) may include: (c-6) preparing a core portion formed of the first material so as to be joined to the first terminal plate; and (c-7) forming the first electrode terminal by joining a clad portion formed of the second material so as to be formed on at least a portion of the outer surface of the core portion so as to be joined to the first sub-plate.

[0025] According to one embodiment of the present invention, prior to step (e), the step (f) may include a step of bonding a third insulating member formed to support the first sub-plate to an upper portion of the first sub-plate.

[0026] According to one embodiment of the present invention, a battery cell is provided. The battery cell includes: an electrode assembly having first electrodes and second electrodes formed on both sides of a separator; a housing having an electrode receiving portion formed therein and housing the electrode assembly; and a cap plate assembly having a first electrode portion formed in a conductive state and connected to the first electrode in a cap plate formed to cover an upper portion of the housing and having a first through-hole formed therein so as to communicate the inside and the outside of the housing; and a second electrode portion formed in an insulating state in a second through-hole formed in the cap plate and connected to the second electrode; wherein the first electrode portion comprises: a first terminal plate formed of a first material and mounted on an upper portion of the cap plate so as to be connected to a bus bar from an outer side of the housing; a first insulating portion formed on an upper portion of the cap plate, on which the first terminal mounting portion is formed, and having a first through-hole formed inside the first receiving portion, and formed to space the first terminal plate and the cap plate apart; The cap plate may include a first electrode terminal formed by laminating the first material and a second material different from the first material in the width or length direction, and inserted into the first through hole and coupled so as to conduct current from the inside of the housing to the first terminal plate; and a first sub-plate formed of the second material and connected so as to conduct current with the first electrode terminal, and connected to a lower portion of the first electrode terminal.

[0027] According to one embodiment of the present invention, the first electrode terminal may include a core portion formed of the first material and having an upper surface joined to the first terminal plate; and a clad portion formed of the second material and formed to surround an outer surface of the core portion and having a lower surface joined to the first sub-plate.

[0028] According to one embodiment of the present invention, the second electrode portion may include: a second terminal plate formed of a first material and installed to be seated on an upper portion of the cap plate so as to be connected to the bus bar; a second terminal seating portion formed on an upper portion, on which the second terminal plate is seated, a second through-hole formed inside the second receiving hole, and a second insulating portion formed to space the second terminal plate and the cap plate apart; a second electrode terminal formed of the first material and inserted into and coupled to the second through-hole so as to conduct current from the inside of the housing to the second terminal plate; and a second sub-plate formed of the first material and connected to the second electrode terminal so as to conduct current and be connected to a lower portion of the second electrode terminal.

[0029] According to one embodiment of the present invention as described above, the cap plate and the electrode terminal are inserted and combined to effectively prevent electrolyte leakage between the cap plate and the electrode terminal, and the manufacturing process for combining a sealing member such as a gasket can be simplified, production efficiency can be improved, and manufacturing and process costs can be reduced.

[0030] In addition, a cap plate assembly, a method for manufacturing the cap plate assembly, and a battery cell including the same can be realized by increasing the bonding area between each component using an extruded clad material and lowering the resistance between dissimilar materials from the electrode assembly to the bus bar, thereby improving power transmission efficiency. Of course, the scope of the present invention is not limited by these effects.

[0031] FIG. 1 is a perspective view showing a cap plate assembly according to one embodiment of the present invention.

[0032] FIG. 2 is a cross-sectional view showing a cap plate assembly according to one embodiment of the present invention.

[0033] FIG. 3 is an exploded perspective view showing a cap plate assembly according to one embodiment of the present invention.

[0034] FIG. 4 is a cross-sectional view showing the structure of a cap plate assembly disassembled according to one embodiment of the present invention.

[0035] FIG. 5 is a cross-sectional view showing a cap plate assembly according to another embodiment of the present invention.

[0036] Fig. 6 is a cross-sectional view showing the structure of the cap plate assembly according to Fig. 5 by disassembling it.

[0037] Figure 7 is a cross-sectional view showing a battery cell according to one embodiment of the present invention.

[0038] FIG. 8 is an exploded perspective view showing a cap plate assembly of a battery cell according to one embodiment of the present invention.

[0039] FIG. 9 is a drawing showing a method for manufacturing a cap plate assembly according to one embodiment of the present invention.

[0040] FIGS. 10 to 12 are drawings showing various embodiments of the step of preparing the first electrode terminal in step (c) of FIG. 9.

[0041] FIG. 13 is a drawing showing a method for manufacturing a cap plate assembly according to another embodiment of the present invention.

[0042] Fig. 14 is a perspective view showing the step of forming the first insulating part in step (b).

[0043] Figures 15 to 17 are drawings showing various embodiments of forming the first electrode terminal in step (c).

[0044] Figures 18 and 19 are drawings showing the first subplate and the first electrode terminal being joined in step (d).

[0045] Figure 20 is a drawing showing the first electrode terminal and the first terminal plate being joined in step (e).

[0046] Figure 21 is a drawing showing the third insulating part being bonded in step (f).

[0047] Hereinafter, various preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0048] The embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. The following embodiments may be modified in various ways, and the scope of the present invention is not limited to the following embodiments. Rather, these embodiments are provided to more faithfully and completely explain the present disclosure and to fully convey the spirit of the present invention to those skilled in the art. In addition, the thickness and size of each layer in the drawings are exaggerated for convenience and clarity of explanation.

[0049] Hereinafter, embodiments of the present invention will be described with reference to drawings schematically illustrating ideal embodiments of the present invention. In the drawings, variations in the shapes depicted may be expected, for example, depending on manufacturing techniques and / or tolerances. Therefore, embodiments of the present invention should not be construed as limited to the specific shapes of the regions depicted herein, but should include, for example, variations in shapes resulting from manufacturing processes.

[0050] FIG. 1 is a perspective view showing a cap plate assembly according to one embodiment of the present invention, FIG. 2 is a cross-sectional view showing the cap plate assembly of FIG. 1, FIG. 3 is an exploded perspective view showing the cap plate assembly of FIG. 1, and FIG. 4 is a cross-sectional view showing the structure by disassembling the cap plate assembly of FIG. 1.

[0051] First, a cap plate assembly according to one embodiment of the present invention may largely include a cap plate (1100) and a first electrode portion (1200), as illustrated in FIG. 1.

[0052] The cap plate (1100) is formed to cover the upper portion of the housing (3000), and a first receiving hole (1110) may be formed at least partially through the housing so that the inside and the outside of the housing (3000) are connected.

[0053] The cap plate (1100) can be installed in the opening of the housing of the battery cell to seal the housing. For example, the housing and the cap plate (1100) can be formed of a first material and welded to each other, and the first material can include aluminum, an aluminum alloy, or the like.

[0054] In addition, the cap plate (1100) may include an electrolyte injection port, a vent hole, a terminal hole, etc. The electrolyte injection port (not shown) is an injection port through which electrolyte can be injected into the interior of the housing after the cap plate (1100) is coupled to the housing. After the electrolyte is injected, the electrolyte injection port may be sealed with a sealing plug (not shown).

[0055] As shown in FIGS. 2 to 4, the cap plate (1100) may have a first receiving hole (1110) formed through at least a portion thereof in the upper and lower directions.

[0056] Specifically, the first receiving hole (1110) is a hole formed by penetrating the cap plate (1100) so as to connect the lower and upper parts of the cap plate (1100). The inner surface of the first receiving hole (1110) together with the periphery of the first receiving hole (1110) may be surrounded by a first insulating part (1240) to be described later.

[0057] Additionally, the cap plate (1100) may have a first support hole (1120) formed therein, at least in part, through which the first support hole (1120) extends upwardly and downwardly.

[0058] As illustrated in FIG. 3, the first support hole (1120) is a hole formed through the cap plate (1100) so as to connect the lower and upper portions of the cap plate (1100). The first support hole (1120) may be formed around the first receiving hole (1110), and preferably, may be formed on both sides of the first receiving hole (1110) and filled with the first insulating portion (1240).

[0059] The first electrode portion (1200) can be coupled to the first through hole (1242) at the upper and lower portions of the cap plate (1100).

[0060] Specifically, the first electrode portion (1200) may include a first terminal plate (1210), a first insulating portion (1240), a first electrode terminal (1220), and a first sub-plate (1230).

[0061] As shown in FIGS. 2 to 4, the first terminal plate (1210) can be installed and secured on the upper portion of the cap plate (1100) so as to be connected to the bus bar from the outside of the housing.

[0062] The upper surface of the first terminal plate (1210) can be formed in a shape corresponding to the shape of the bus bar so that it can be combined with the bus bar, and can be surface-treated so as to increase the current-carrying efficiency when in contact with the bus bar.

[0063] A protrusion may be formed on the side of the first terminal plate (1210). The protrusion may be formed along the perimeter of the first terminal plate (1210) and may be formed as a protruding protrusion with a lower portion than an upper portion of the side of the first terminal plate (1210).

[0064] The first terminal plate (1210) may be formed of a first material, and the first material may include aluminum, an aluminum alloy, or the like.

[0065] As shown in FIGS. 2 to 4, the first insulating portion (1240) may have a first terminal mounting portion (1241) formed thereon, on which the first terminal plate (1210) is mounted.

[0066] The first insulation part (1240) may be installed on the first terminal mounting part (1241) so that the first terminal plate (1210) can be fixed to the first insulation part (1240), and a fixing groove into which the protrusion is inserted may be formed.

[0067] The above fixed groove portion can be formed in a shape corresponding to the protrusion portion at a position corresponding to the circumference of the first terminal plate (1210) in the first insulating portion (1240).

[0068] The first insulating portion (1240) may be formed at least partially on the upper portion of the cap plate (1100), and a first terminal mounting portion (1241) may be formed on the opposite surface that contacts the cap plate (1100), thereby separating the first terminal plate (1210) and the cap plate (1100).

[0069] The first insulating portion (1240) may have a first through hole (1242) formed inside the first receiving hole (1110). Specifically, at least a portion of the first insulating portion (1240) may be formed on the inside of the first receiving hole (1110) so that the inner surface of the first receiving hole (1110) is blocked from the outside.

[0070] At this time, the first receiving hole (1110) is not filled with the first insulating portion (1240), and a first through hole (1242) smaller than the first receiving hole (1110) is formed inside the first receiving hole (1110), and at least a portion of the first electrode portion (1200) can be inserted through the first through hole (1242).

[0071] The first receiving hole (1110) can be formed by penetrating through a hole of various shapes such as circular, oval, and square.

[0072] The first insulating portion (1240) is formed to surround the first receiving hole (1110) of the cap plate (1100) and can be formed to fix the first terminal plate (1210).

[0073] Specifically, the first insulating portion (1240) can be formed by insert injection with the cap plate (1100) and the first terminal plate (1210).

[0074] That is, in a mold in which the cap plate (1100) and the first terminal plate (1210) are fixed, a molten material can be injected around the first receiving hole (1110) of the cap plate (1100) and between the cap plate (1100) and the first terminal plate (1210) to form the first insulating portion (1240).

[0075] The first insulating portion (1240) is insert-molded between the cap plate (1100) and the first terminal plate (1210), so that the cap plate (1100), the first insulating portion (1240), and the first terminal plate (1210) can be easily joined without performing individual assembly processes.

[0076] In addition, the first terminal plate (1210) and the first insulating portion (1240) can be easily fixed, and the space between the first terminal plate (1210) and the first insulating portion (1240) can be sealed without sealing such as a gasket.

[0077] As illustrated in FIGS. 2 to 4, the first sub-plate (1230) can be connected to the lower portion of the first electrode terminal (1220) so as to conduct current with the first electrode terminal (1220). For example, the first sub-plate (1230) is formed in a flat shape, one side of which is joined to the first electrode terminal (1220), and the other side of which is joined to a tab portion inside the housing, so that current can be conducted from the tab portion to the first electrode terminal (1220).

[0078] The first sub-plate (1230) can be formed of the second material.

[0079] The first electrode terminal (1220) can be inserted into and connected to the first through hole (1242) so as to conduct current from the first sub-plate (1230) formed inside the housing (3000) to the first terminal plate (1210).

[0080] As shown in FIGS. 2 to 4, the first electrode terminal (1220) can be formed by stacking the first material and a second material different from the first material in the width or length direction of the cap plate (1100).

[0081] Specifically, the first electrode terminal (1220) may include a core portion (1221) and a clad portion (1222).

[0082] The core portion (1221) can be formed into various shapes such as circular, oval, and square.

[0083] The core portion (1221) is formed of a first material, and the first material may include aluminum, an aluminum alloy, or the like.

[0084] The clad portion (1222) may be formed to surround the outer surface of the core portion (1221). For example, the clad portion (1222) may be formed to surround a direction perpendicular to the axial direction of the core portion (1221).

[0085] The clad portion (1222) is formed of a second material, and the second material may include copper, a copper alloy, nickel, a nickel alloy, or the like.

[0086] The clad portion (1222) and the core portion (1221) are laminated bodies of different materials that are bonded together through the destruction, bonding, and stabilization of the mutual tissues of the surfaces where the clad portion (1222) and the core portion (1221) come into contact due to strong heat and pressure.

[0087] By forming a clad portion (1222) on the outer surface of the core portion (1221), the core portion (1221) can be protected from corrosion and damage even if the electrolyte contained inside the housing flows into the first electrode terminal (1220).

[0088] The upper surface of the first electrode terminal (1220) can be joined to the first terminal plate (1210), and the lower surface of the first electrode terminal (1220) can be joined to the first sub-plate (1230).

[0089] The first terminal plate (1210) may be formed of the first material as described above, and the first sub-plate (1230) may be formed of a second material different from the first material.

[0090] In order to conduct current between the first terminal plate (1210) and the first sub-plate (1230) formed of different materials, a first electrode terminal (1220) formed by laminating the first material and the second material is installed between the first terminal plate (1210) and the first sub-plate (1230) so that they can be joined to the same material.

[0091] Specifically, the core portion (1221) of the first electrode terminal (1220) can have its upper surface joined to the first terminal plate (1210), and for example, the first terminal plate (1210) and the core portion (1221) can be joined by welding from above the first terminal plate (1210), and preferably, can be joined by laser welding.

[0092] The clad portion (1222) of the first electrode terminal (1220) may be bonded to the first sub-plate (1230) on its lower surface. For example, the clad portion (1222) and the first sub-plate (1230) may be bonded to the lower surface of the clad portion (1222) by direct bonding. In addition, the clad portion (1222) and the first sub-plate (1230) may be bonded to each other by various methods, such as physical / chemical bonding and welding.

[0093] That is, the core part (1221) of the first electrode terminal (1220) and the first terminal plate (1210) are joined, and the clad part (1222) of the first electrode terminal (1220) and the first sub-plate (1230) are joined, so that a configuration formed of the same main component material is in contact, thereby lowering the resistance from the inside of the housing to the bus bar and increasing the power transmission efficiency.

[0094] FIG. 5 is a cross-sectional view showing a cap plate assembly according to another embodiment of the present invention, and FIG. 6 is a cross-sectional view showing the structure of the cap plate assembly according to FIG. 5 in an exploded form.

[0095] As shown in FIGS. 5 and 6, the first electrode terminal (1220) may include a core portion (1221), a clad portion (1222), and a base portion (1223).

[0096] The core portion (1221) and the clad portion (1222) can be formed with the same configuration as described above.

[0097] The base portion (1223) is a flat-shaped structure that is joined to the lower portion of the core portion (1221) and the clad portion (1222). The base portion (1223) is formed with a larger area than the core portion (1221) and the clad portion (1222), so that the core portion (1221) and the clad portion (1222) can be joined to one surface, and the first sub-plate (1230) can be joined to the other surface.

[0098] The base portion (1223) can be formed of the second material.

[0099] The base portion (1223) can be joined to the clad portion (1222) by welding at least a portion of the periphery of the clad portion (1222) on the upper portion of the base portion (1223).

[0100] Specifically, the upper surface of the base portion (1223) and the side perimeter of the clad portion (1222) can be welded and joined. Thus, the transmission efficiency can be increased through a wider area of ​​the base portion (1223), and the bonding with the first sub-plate (1230) can be easily performed.

[0101] The cap plate assembly according to some embodiments of the present invention may further include a third insulating member (1250).

[0102] The third insulating member (1250) can be formed by being joined to the lower portion of the cap plate (1100) to support the first sub-plate (1230).

[0103] As shown in FIGS. 2 to 4, the third insulating portion (1250) is formed in a flat shape, and an opening extending vertically may be formed in at least a portion thereof.

[0104] The upper surface of the third insulating portion (1250) is installed by being joined to the lower surface of the cap plate (1100), and the lower surface of the third insulating portion (1250) can be joined to the upper surface of the first sub-plate (1230). At this time, the first electrode terminal (1220) joined to the first sub-plate (1230) can be inserted through the opening.

[0105] The third insulating member (1250) is formed between the first sub-plate (1230) and the cap plate (1100), so as to separate the first sub-plate (1230) from the cap plate (1100).

[0106] FIG. 9 is a drawing showing a method for manufacturing a cap plate assembly according to one embodiment of the present invention, and FIG. 10 is a drawing showing a step of preparing a first electrode terminal in step (c) of FIG. 9.

[0107] A method for manufacturing a cap plate assembly according to one embodiment of the present invention may include, as illustrated in FIG. 9, (a) a step of preparing a cap plate (1100) having a first receiving hole (1110) formed therein, (b) a step of forming a first insulating portion (1240) having a first through-hole (1242) between a first terminal plate (1210) and a cap plate (1100), (c) a step of preparing a first electrode terminal (1220) formed by stacking a first material and a second material, (d) a step of joining a first sub-plate (1230) formed of a second material to a lower portion of the first electrode terminal (1220), and (e) a step of joining the first terminal plate (1230) to an upper portion of the first electrode terminal (1220) by inserting it into the first through-hole (1242).

[0108] Specifically, the step (a) is a step of preparing a cap plate (1100) that is formed to cover the upper portion of the housing (3000) and has a first receiving hole (1110) formed at least partially through the housing so that the inside and the outside of the housing (3000) are connected.

[0109] In the above step (a), a first receiving hole (1110) can be formed by penetrating the cap plate (1100) so as to connect the lower and upper parts of the cap plate (1100).

[0110] In the above step (a), a first support hole (1120) can be formed by vertically penetrating at least a portion of the cap plate (1100).

[0111] In the above step (a), an electrolyte injection port, a vent hole, a terminal hole, etc. can be formed in the cap plate (1100), and after the electrolyte is injected, a sealing plug (not shown) for sealing the electrolyte injection port can be prepared.

[0112] As illustrated in FIG. 9, the step (b) is a step of installing a first terminal plate (1210) formed of a first material and installed on the upper portion of the cap plate (1100) so as to be connected to a bus bar from the outside of the housing (3000), on the upper portion of the cap plate (1100), while spacing the first terminal plate (1210) and the cap plate (1100) apart, and forming a first insulating portion (1240) having a first through hole (1242) penetrating from the upper portion to the lower portion.

[0113] Specifically, in the step (b) above, the cap plate (1100) and the first terminal plate (1210) may be insert-molded to form the first insulating portion (1240) between the cap plate (1100) and the first terminal plate (1210).

[0114] Fig. 14 is a perspective view showing a step of forming the first insulating part in step (b).

[0115] As illustrated in FIG. 14, a first insulating portion (1240) can be formed by injecting a molten material around the first receiving hole (1110) of the cap plate (1100) and between the cap plate (1100) and the first terminal plate (1210) in a mold to which the cap plate (1100) and the first terminal plate (1210) are fixed.

[0116] In the above step (b), a first insulating portion (1240) can be formed that includes a fixing groove portion having a shape surrounding a protrusion formed around the first terminal plate (1210) so that the first terminal plate (1210) can be fixed to the first insulating portion (1240).

[0117] In the above step (b), at least a portion of the first insulating portion (1240) may be formed on the inside of the first receiving hole (1110) so that the inner surface of the first receiving hole (1110) is blocked from the outside.

[0118] As illustrated in FIG. 9, the step (c) is a step of preparing a first electrode terminal (1220) formed by stacking a first material and a second material different from the first material in the width or length direction of the cap plate (1100).

[0119] Specifically, the step (c) may include, as shown in FIG. 10, (c-1) a step of preparing a core material portion (1221-1), (c-2) a step of joining the periphery of the core material portion (1221-1) with a clad portion (1222), and (c-3) a step of forming a first electrode terminal (1220).

[0120] FIG. 15 and FIG. 16 are drawings showing the formation of the first electrode terminal (1220) in the above step (c-1), the above step (c-2), and the above step (c-3).

[0121] In the above step (c-1), a core material portion (1221-1) formed of a first material and extended to a predetermined length in the longitudinal direction can be prepared so as to be joined to a first terminal plate (1210).

[0122] The above core material portion (1221-1) can be formed of the first material, such as aluminum or an aluminum alloy. At this time, the core material portion (1221-1) is illustrated as a circle in Fig. 15, but may have various shapes other than a circle, such as an oval or a square.

[0123] The above step (c-2) is a step of wrapping the perimeter of the core material part (1221-1) with a clad part (1222) formed of a second material so that it can be joined to the first sub-plate (1230).

[0124] Specifically, the above step (c-2) is a step in which the clad portion (1222) surrounds the core portion (1221) in a direction perpendicular to the axis, and the mutual tissue of the contact surfaces of the clad portion (1222) and the core portion (1221) is destroyed, combined, and stabilized to combine the contact surfaces with each other.

[0125] The above step (c-3) is a step of forming a first electrode terminal (1220) by cutting the core material portion (1221-1) wrapped with the clad portion (1222) in a direction perpendicular to the length direction, as illustrated in FIG. 15.

[0126] Thus, as shown in Fig. 16, a first electrode terminal (1220) can be formed with the longitudinally cut surface as the upper and lower surfaces.

[0127] As illustrated in FIG. 9, the step (d) is a step of joining the lower portion of the first electrode terminal (1220) to the first sub-plate (1230) formed of the second material and formed to conduct electricity with the first electrode terminal (1220).

[0128] Figure 18 is a drawing showing the first sub-plate (1230) and the first electrode terminal (1220) being joined in step (d).

[0129] As illustrated in FIG. 18, in the step (d), the first electrode terminal (1220) can be bonded to the upper surface of the first sub-plate (1230), for example, by direct bonding.

[0130] In the above step (d), the first sub-plate (1230) is joined to the first electrode terminal (1220), so that current flows from the first sub-plate (1230) to both the core portion (1221) and the clad portion (1222). At this time, since the resistance value is low at the joining surface between the first sub-plate (1230) and the clad portion (1222) formed of a material having the same main component, current can flow better.

[0131] In addition, the cladding portion (1222) and the first sub-plate (1230) are formed of a material with the same main component and can be joined by various methods such as physical / chemical bonding and welding.

[0132] As illustrated in FIG. 9, the step (e) is a step of bonding the first terminal plate (1210) to the upper portion of the first electrode terminal (1220).

[0133] Figure 20 is a drawing showing the first electrode terminal and the first terminal plate being joined in step (e).

[0134] As illustrated in FIG. 20, in the step (e), the first electrode terminal (1220) is inserted into the first through hole (1242) so that the first terminal plate (1210) can be electrically connected from the electrode assembly (2000) inside the housing (3000), and the first terminal plate (1210) can be joined to the upper portion of the first electrode terminal (1220).

[0135] In the above step (e), the core portion (1221) may be welded to the area formed on the upper portion of the first terminal plate (1210), and preferably, may be welded by laser welding. At this time, the first terminal plate (1210) and the core portion (1221) may be formed of a material with the same main component, so that they may be easily joined.

[0136] FIG. 13 is a drawing showing a method for manufacturing a cap plate assembly according to another embodiment of the present invention, and FIG. 21 is a drawing showing the third insulating part being joined in step (f).

[0137] A method for manufacturing a cap plate assembly according to another embodiment of the present invention may include, as illustrated in FIG. 13, a step of (f) bonding a third insulating member (1250) prior to step (e).

[0138] As illustrated in FIG. 21, the step (f) is a step of supporting the first sub-plate (1230) by joining the third insulating member (1250) to the upper portion of the first sub-plate (1230).

[0139] Specifically, in the step (f) above, a cap plate (1100) may be installed by being coupled to the upper surface of the third insulating portion (1250), and a first sub-plate (1230) may be coupled to the lower surface of the third insulating portion (1250). At this time, a first electrode terminal (1220) bonded to the first sub-plate (1230) may be inserted through an opening formed by penetrating at least a portion of the third insulating portion (1250).

[0140] That is, the above step (f) is a step of combining a third insulating member (1250) between the first sub-plate (1230) and the cap plate (1100), thereby separating the first sub-plate (1230) from the cap plate (1100) and fixing the first sub-plate (1230) to the third insulating member (1250).

[0141] FIG. 11 and FIG. 12 are drawings showing various embodiments of a step of preparing a first electrode terminal in step (c) of FIG. 9, FIG. 17 are drawings showing various embodiments of forming a first electrode terminal in step (c), and FIG. 19 are drawings showing the first subplate and the first electrode terminal being joined in step (d).

[0142] In a method for manufacturing a cap plate assembly according to another embodiment of the present invention, the step (c) may include, as illustrated in FIG. 11, (c-1) preparing a core material portion (1221-1), (c-2) joining the clad portion (1222) to wrap the periphery of the core material portion (1221-1), (c-4) cutting the core material portion (1221-1) wrapped with the clad portion (1222) in a direction perpendicular to the longitudinal direction, and (c-5) joining a flat base portion (1223) to the lower portion of the cut core material portion (1221-1) and the clad portion (1222) to form a first electrode terminal (1220).

[0143] The above steps (c-1) and (c-2) are the same as described above.

[0144] The above step (c-5) is a step of preparing a base part (1223) and joining the core material part (1221-1) and clad part (1222) cut in the above step (c-4) to the base part (1223).

[0145] Specifically, as illustrated in FIG. 17, the step (c-5) is a step in which the base portion (1223) and the clad portion (1222) are joined by welding at least a portion of the circumference of the clad portion (1222) on the upper portion of the base portion (1223).

[0146] For example, in the above step (c-5), the upper surface of the base portion (1223) and the side perimeter of the clad portion (1222) can be welded and joined.

[0147] At this time, in the step (d), as shown in FIG. 19, the first sub-plate (1230) can be joined to the base portion (1223) by welding, and preferably, by laser welding.

[0148] In addition, in the method for manufacturing a cap plate assembly according to another embodiment of the present invention, the step (c) may include, as illustrated in FIG. 12, a step of (c-6) preparing a core portion (1221) formed of a first material so as to be joined to a first terminal plate (1210), and a step of (c-7) forming a first electrode terminal (1220) by joining a clad portion (1222) formed of a second material so as to be joined to a first sub-plate (1230) to at least a portion of the outer surface of the core portion (1221).

[0149] For example, in the step (c-6) above, a core part (1221) is prepared, and in the step (c-7) above, a clad part (1222) is laminated around the core part (1221) to individually form a first electrode terminal (1220).

[0150] FIG. 7 is a cross-sectional view showing a battery cell according to one embodiment of the present invention, and FIG. 8 is an exploded perspective view showing a cap plate assembly of the battery cell of FIG. 7.

[0151] A battery cell according to one embodiment of the present invention may include an electrode assembly (2000), a housing (3000), and a cap plate assembly (1000), as illustrated in FIG. 7.

[0152] As illustrated in FIG. 7, the electrode assembly (2000) is a structure in which a first electrode (2200) and a second electrode (2300) are formed on both sides of a separator (2100). Specifically, the first electrode (2200) and the second electrode (2300), which are each formed as a single plate with the separator (2100) interposed therebetween, may be assembled by stacking them, or the separator (2100), the first electrode (2200), and the second electrode (2300) may be assembled by folding them in a zigzag shape and stacking them.

[0153] The housing (3000) is a case in which an electrode receiving portion (3100) is formed inside and an electrode assembly (2000) is built in. An opening is formed on one side to allow the electrode assembly (2000) to be coupled thereto, and the opening can be sealed with a cap plate assembly (1000) to allow the electrode assembly (2000) and an electrolyte to be accommodated inside.

[0154] The cap plate assembly (1000) may include a first electrode portion (1200) that is formed to cover the upper portion of the housing (3000) and is installed in a conductive state on the cap plate (1100) in which a first through hole (1242) is formed so that the inside and the outside of the housing (3000) are connected to the first electrode (2200).

[0155] The first electrode portion (1200) and the second electrode portion (1300) may be selectively formed according to polarity, or the first electrode portion (1200) may include a negative terminal installed in an insulated state on the cap plate (1100), and the second electrode portion (1300) may include a positive terminal installed in an insulated or conductive state on the cap plate (1100). At this time, the cap plate (1100) and the housing (3000) may be charged in a positive state.

[0156] As illustrated in FIG. 8, the first electrode portion (1200) may include a first terminal plate (1210), a first insulating portion (1240), a first electrode terminal (1220), and a first sub-plate (1230).

[0157] The first terminal plate (1210) may be formed of the first material and installed on the upper portion of the cap plate (1100) so as to be connected to the bus bar from the outside of the housing (3000).

[0158] The first insulating portion (1240) may be formed with a first terminal mounting portion (1241) on which a first terminal plate (1240) is mounted on the upper portion, a first through hole (1242) is formed inside the first receiving hole (1110), and may be formed to separate the first terminal plate (1240) and the cap plate (1100).

[0159] The first electrode terminal (1220) is formed by laminating a first material and a second material different from the first material in the width or length direction of the cap plate (1100), and can be inserted into and joined to the first through hole (1242) so as to conduct current from the inside of the housing (3000) to the first terminal plate (1210).

[0160] At this time, the first electrode terminal (1220) may include a core portion (1221) formed of a first material and having an upper surface joined to the first terminal plate (1210) and a clad portion (1222) formed of a second material and formed to surround the outer surface of the core portion (1221) and having a lower surface joined to the first sub-plate (1230).

[0161] The first sub-plate (1230) is formed of a second material and is electrically connected to the first electrode terminal (1220), and can be connected to the lower portion of the first electrode terminal (1220).

[0162] The first terminal plate (1210), the first insulator (1240), the first electrode terminal (1220), and the first sub-plate (1230) may include various embodiments as illustrated in FIGS. 2 to 6 and are the same as those described above.

[0163] The cap plate assembly (1000) may include a second electrode portion (1300) that is installed in an insulated state in a second through hole (1342) formed in the cap plate (1100) and connected to a second electrode (2300).

[0164] As illustrated in FIG. 8, the second electrode portion (1300) may include a second terminal plate (1310), a second insulating portion (1340), a second electrode terminal (1320), and a second sub-plate (1330).

[0165] The second terminal plate (1310) may be formed of the first material and installed to be seated on the upper portion of the cap plate (1100) so as to be connected to the bus bar.

[0166] The upper surface of the second terminal plate (1310) can be formed in a shape corresponding to the shape of the bus bar so that it can be combined with the bus bar, and can be surface-treated so as to increase the current-carrying efficiency when in contact with the bus bar.

[0167] A protrusion may be formed on the side of the second terminal plate (1310). The protrusion may be formed along the perimeter of the second terminal plate (1310) and may be formed as a protruding portion with a lower portion protruding than an upper portion of the side of the second terminal plate (1310).

[0168] The second terminal plate (1310) may be formed of a first material, and the first material may include aluminum, an aluminum alloy, or the like.

[0169] The second insulating portion (1340) may have a second terminal mounting portion (1341) formed thereon, on which the second terminal plate (1310) is mounted.

[0170] The second insulation part (1340) may be installed on the second terminal mounting part (1341) so that the second terminal plate (1310) can be fixed to the second insulation part (1340), and a fixing groove into which the protrusion is inserted may be formed.

[0171] The above fixed groove portion can be formed in a shape corresponding to the protrusion portion at a position corresponding to the circumference of the second terminal plate (1310) in the second insulating portion (1340).

[0172] The second insulating portion (1340) may be formed at least partially on the upper portion of the cap plate (1100), and a second terminal mounting portion (1341) may be formed on the opposite surface that contacts the cap plate (1100), thereby separating the second terminal plate (1310) and the cap plate (1100).

[0173] The second insulating portion (1340) may have a second through hole (1342) formed inside the second receiving hole (1130). Specifically, at least a portion of the second insulating portion (1340) may be formed on the inside of the second receiving hole (1130), such that the inner surface of the second receiving hole (1130) is blocked from the outside.

[0174] At this time, the second receiving hole (1130) is not filled with the second insulating portion (1340), and a second through hole (1342) smaller than the second receiving hole (1130) is formed inside the second receiving hole (1130), and at least a portion of the second electrode portion (1300) can be inserted through the second through hole (1342).

[0175] The second receiving hole (1130) can be formed by penetrating through a hole of various shapes such as circular, oval, and square.

[0176] The second insulating portion (1340) may be formed to surround the second receiving hole (1130) of the cap plate (1100) and may be formed to secure the second terminal plate (1310).

[0177] Specifically, the second insulating portion (1340) can be formed by insert injection with the cap plate (1100) and the second terminal plate (1310).

[0178] That is, in a mold in which the cap plate (1100) and the second terminal plate (1310) are fixed, a molten material can be injected around the second receiving hole (1130) of the cap plate (1100) and between the cap plate (1100) and the second terminal plate (1310) to form a second insulating portion (1340).

[0179] At this time, the second insulating part (1340) may include a conductive polymer resin.

[0180] The second insulating portion (1340) is insert-molded between the cap plate (1100) and the second terminal plate (1310), so that the cap plate (1100), the second insulating portion (1340), and the second terminal plate (1310) can be easily joined without performing individual assembly processes.

[0181] In addition, the second terminal plate (1310) and the second insulation part (1340) can be easily fixed, and the space between the second terminal plate (1310) and the second insulation part (1340) can be sealed without sealing such as a gasket.

[0182] The second sub-plate (1330) is formed of the first material and is connected to the second electrode terminal (1320) so as to conduct electricity, and can be connected to the lower portion of the second electrode terminal (1320). For example, the second sub-plate (1330) is formed in a flat shape, one side of which is joined to the second electrode terminal (1320), and the other side of which is joined to a tab portion inside the housing, so that electricity can be conducted from the tab portion to the second electrode terminal (1320).

[0183] The second electrode terminal (1320) can be connected by inserting a terminal portion formed of the first material into the second through hole (1342) so that current can be transmitted from the inside of the housing (3000) to the second terminal plate (1310).

[0184] The second electrode terminal (1320) is formed of a first material including aluminum, an aluminum alloy, or the like, and can be formed as a single body. Thus, the second sub-plate (1330), the second electrode terminal (1320), and the second terminal plate (1310) are formed of the same material as the main component, thereby increasing power transmission efficiency.

[0185] While the present invention has been described with reference to the embodiments illustrated in the drawings, these are merely exemplary, and those skilled in the art will appreciate that various modifications and equivalent alternative embodiments are possible. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the appended claims.

Claims

1. A cap plate formed to cover the upper portion of the housing and having a first receiving hole formed through at least a portion thereof so that the inside and the outside of the housing are connected; and A first electrode part coupled to the first through hole at the upper and lower portions of the cap plate; Including, The above first electrode part, A first terminal plate formed of a first material and installed on the upper portion of the cap plate so as to be connected to a bus bar from the outside of the housing; A first terminal mounting portion is formed on the upper side, on which the first terminal plate is mounted, a first through hole is formed inside the first receiving hole, and a first insulating portion is formed to separate the first terminal plate and the cap plate; A first electrode terminal formed by laminating the first material and a second material different from the first material in the width or length direction of the cap plate, and inserted into the first through hole and coupled so as to conduct current from the inside of the housing to the first terminal plate; and A first sub-plate formed of the second material and connected to the first electrode terminal so as to conduct electricity therethrough, and connected to a lower portion of the first electrode terminal; A cap plate assembly including:

2. In paragraph 1, The above first insulating part is, A cap plate assembly formed by insert injection into the cap plate and the first terminal plate, so as to be formed between the cap plate and the first terminal plate.

3. In paragraph 1, The above first electrode terminal is, A core portion formed of the first material and having an upper surface joined to the first terminal plate; and A clad portion formed of the second material and formed to surround the outer surface of the core portion, the lower surface of which is bonded to the first sub-plate; A cap plate assembly including:

4. In paragraph 3, The above first terminal plate and the core portion are joined by laser welding, A cap plate assembly wherein the clad portion and the first subplate are joined by direct bonding.

5. In paragraph 1, The above first electrode terminal is, An inner core portion formed of the first material and having an upper surface joined to the first terminal plate; A clad portion formed of the second material and formed to surround the outer surface of the core portion; and A flat base portion joined to the core portion and the lower portion of the clad portion; A cap plate assembly including:

6. In paragraph 5, A cap plate assembly in which at least a portion of the periphery of the clad portion is welded along the upper portion of the base portion, so that the base portion and the clad portion are joined.

7. In paragraph 5, A cap plate assembly, wherein the bonding of the first terminal plate and the core portion, and the bonding of the base portion and the first sub-plate are bonded by laser welding.

8. In paragraph 1, A third insulating member formed by being bonded to the lower portion of the cap plate to support the first sub-plate; A cap plate assembly including: 9.(a) A step of preparing a cap plate formed to cover the upper part of the housing and having a first receiving hole formed at least partially through the housing so that the inside and the outside of the housing are connected; (b) a step of installing a first terminal plate formed of a first material and installed on the upper portion of the cap plate so as to be connected to a bus bar from the outside of the housing, and forming a first insulating portion having a first through hole extending upwardly and downwardly while spacing the first terminal plate and the cap plate apart from each other; (c) a step of preparing a first electrode terminal formed by laminating the first material and a second material different from the first material in the width or length direction of the cap plate; (d) a step of joining a first sub-plate formed of the second material and configured to conduct electricity with the first electrode terminal to the lower portion of the first electrode terminal; (e) a step of inserting the first electrode terminal into the first through hole and bonding the first terminal plate to the upper portion of the first electrode terminal so that the first terminal plate is energized from the electrode assembly inside the housing; A method for manufacturing a cap plate assembly, comprising:

10. In paragraph 9, In step (b) above, A method for manufacturing a cap plate assembly, wherein the cap plate and the first terminal plate are insert-molded to form the first insulating portion so that the first insulating portion is formed between the cap plate and the first terminal plate.

11. In paragraph 9, Step (c) above, (c-1) A step of preparing a core material portion formed of the first material and extended to a predetermined length in the longitudinal direction so as to be joined to the first terminal plate; (c-2) a step of wrapping the perimeter of the core material portion with a clad portion formed of the second material so that it can be joined to the first sub-plate; and (c-3) A step of forming a first electrode terminal by cutting the core material portion wrapped with the clad portion in a direction perpendicular to the longitudinal direction; A method for manufacturing a cap plate assembly, comprising:

12. In paragraph 11, In step (d) above, The first subplate and the first electrode terminal are joined by direct bonding, In step (e) above, A method for manufacturing a cap plate assembly, wherein the first terminal plate and the core portion are joined by laser welding.

13. In paragraph 9, Step (c) above, (c-1) A step of preparing a core material portion formed of the first material and extended to a predetermined length in the longitudinal direction so as to be joined to the first terminal plate; (c-2) A step of wrapping the periphery of the core material portion with a clad portion formed of the second material so that it can be joined to the first sub-plate; (c-4) a step of cutting the core material portion wrapped with the clad portion in a direction perpendicular to the longitudinal direction; and (c-5) A step of forming a first electrode terminal by bonding a flat base portion to the lower portion of the cut core material portion and the clad portion; A method for manufacturing a cap plate assembly, comprising:

14. In paragraph 13, The above step (c-5) is: A method for manufacturing a cap plate assembly, wherein at least a portion of the circumference of the clad portion is welded along the upper portion of the base portion, so that the base portion and the clad portion are joined.

15. In paragraph 13, In step (d) above, The above first subplate and the base portion are joined by laser welding, In step (e) above, A method for manufacturing a cap plate assembly, wherein the first terminal plate and the core portion are joined by laser welding.

16. In paragraph 9, Step (c) above, (c-6) a step of preparing a core portion formed of the first material so that it can be joined to the first terminal plate; and (c-7) A step of forming the first electrode terminal by bonding the clad portion formed of the second material to at least a portion of the outer surface of the core portion so that it can be bonded to the first sub-plate; A method for manufacturing a cap plate assembly, comprising:

17. In paragraph 9, Prior to step (e) above, (f) a step of bonding a third insulating member formed to support the first sub-plate to the upper portion of the first sub-plate; A method for manufacturing a cap plate assembly, comprising:

18. An electrode assembly in which a first electrode and a second electrode are formed on both sides of a separator; A housing having an electrode receiving portion formed therein and housing the electrode assembly; and A cap plate assembly formed to cover the upper portion of the housing and having a first through-hole formed therein so that the inside and the outside of the housing are connected, wherein a first electrode part is installed in a conductive state and connected to the first electrode, and a second electrode part is installed in an insulating state in a second through-hole formed in the cap plate and connected to the second electrode; Includes, The above first electrode part, A first terminal plate formed of a first material and installed on the upper portion of the cap plate so as to be connected to a bus bar from the outside of the housing; A first terminal mounting portion is formed on the upper side, on which the first terminal plate is mounted, a first through hole is formed inside the first receiving hole, and a first insulating portion is formed to separate the first terminal plate and the cap plate; A first electrode terminal formed by laminating the first material and a second material different from the first material in the width or length direction of the cap plate, and inserted into the first through hole and coupled so as to conduct current from the inside of the housing to the first terminal plate; and A first sub-plate formed of the second material and connected to the first electrode terminal so as to conduct electricity therethrough, and connected to a lower portion of the first electrode terminal; A battery cell comprising:

19. In paragraph 18, The above first electrode terminal is, A core portion formed of the first material and having an upper surface joined to the first terminal plate; and A clad portion formed of the second material and formed to surround the outer surface of the core portion, the lower surface of which is bonded to the first sub-plate; A battery cell comprising:

20. In paragraph 18, The above second electrode part, A second terminal plate formed of the first material and installed on the upper portion of the cap plate so as to be connected to the bus bar; A second terminal mounting portion is formed on the upper side, on which the second terminal plate is mounted, a second through hole is formed inside the second receiving hole, and a second insulating portion is formed to separate the second terminal plate and the cap plate; A second electrode terminal formed of the first material and inserted into and joined to the second through hole so as to conduct current from the inside of the housing to the second terminal plate; and A second sub-plate formed of the first material and connected to the second electrode terminal so as to conduct electricity therethrough, and connected to the lower portion of the second electrode terminal; A battery cell comprising:

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