Battery cell and method for manufacturing battery cell

Abstract

According to exemplary embodiments, a battery cell is provided. The battery cell includes: a first case including a base plate; a plurality of stack cells on the base plate, each of the plurality of stack cells including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode; a plurality of first tab collectors on the base plate; and a plurality of second tab collectors on the base plate, wherein the first tab collectors include first fastening holes, and the first case includes first dents partially filling the first fastening holes.

Description

Battery cells and methods of manufacturing battery cells

[0001] The present invention relates to a battery cell and a method for manufacturing a battery cell. This application claims the benefit of Korean Application No. 10-2024-0042526, filed March 28, 2024, and Korean Application No. 10-2024-0001422, filed January 6, 2025, which are incorporated herein by reference in their entirety.

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. They are widely used as the energy source for various wireless devices, such as handsets, laptops, and cordless vacuum cleaners. Recently, improvements in energy density and economies of scale have dramatically reduced the manufacturing costs of electric-powered hybrid electric vehicles (HEVs) and battery electric vehicles (BEVs). Furthermore, as BEVs' ranges have increased to match those of fuel-powered vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility.

[0003] Secondary batteries are classified into lithium-ion batteries, lithium-ion polymer batteries, and lithium polymer batteries based on the composition of their electrodes and electrolyte. Lithium-ion polymer batteries are increasing their market share within the secondary battery market due to their low risk of electrolyte leakage and ease of manufacturing.

[0004] The technical idea of ​​the present invention is to provide a battery cell and a method for manufacturing a battery cell.

[0005] According to exemplary embodiments of the present invention for solving the above-described problem, a battery cell is provided. The battery cell comprises: a first case including a base plate; a plurality of stack cells on the base plate, each of the plurality of stack cells including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode; a plurality of first tab collectors on the base plate; and a plurality of second tab collectors on the base plate, wherein the first tab collectors include first fastening holes.

[0006] The first tap collectors are spaced apart from the second tap collectors in the first direction.

[0007] Each of the first tap collectors and each of the second tap collectors extends in a second direction perpendicular to the first direction.

[0008] Each of the above first tab collectors includes first fastening holes.

[0009] The above first fastening holes are at the ends of the first tab collectors in the second direction.

[0010] The above first case partially fills the above first fastening holes.

[0011] The first case includes first dents that partially fill the first fastening holes, and the first dents are arranged along a third direction perpendicular to the first and second directions.

[0012] The first tap collectors are arranged along the third direction, and the second tap collectors are arranged along the third direction.

[0013] The second tab collectors include second fastening holes, and the first case partially fills the second fastening holes.

[0014] The anode of each of the plurality of stack cells includes an anode coating portion and an anode tab connected to the anode coating portion, the cathode of each of the plurality of stack cells includes a cathode coating portion and a cathode tab connected to the cathode coating portion, and the anode tab of each of the plurality of stack cells is spaced apart from the cathode tab of each of the plurality of stack cells in a first direction.

[0015] The width of the anode coating portion in the second direction perpendicular to the first direction is the same as the width of the anode tab in the second direction.

[0016] The width of the cathode coating portion in the second direction is the same as the width of the cathode tab in the second direction.

[0017] The battery cell further includes a second case coupled to the first case, and the second case includes a positive terminal shorted to the plurality of first tab collectors and a negative terminal shorted to the plurality of second tab collectors.

[0018] The positive electrode tabs of the corresponding ones of the plurality of stack cells are interposed between the first tab collectors, and the negative electrode tabs of the corresponding ones of the plurality of stack cells are interposed between the second tab collectors.

[0019] According to exemplary embodiments, a battery cell is provided. The battery cell comprises: a first case including a base plate; a plurality of stack cells on the base plate, each of the plurality of stack cells including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode; a plurality of first tab collectors on the base plate; and a plurality of second tab collectors on the base plate, wherein the positive electrode of each of the plurality of stack cells includes a positive electrode coating portion and a positive electrode tab connected to the positive electrode coating portion, and the negative electrode of each of the plurality of stack cells includes a negative electrode coating portion and a negative electrode tab connected to the negative electrode coating portion, and the positive electrode tab of each of the plurality of stack cells is spaced apart from the negative electrode tab of each of the plurality of stack cells in a first direction, and a width of the positive electrode coating portion in a second direction perpendicular to the first direction is equal to a width of the positive electrode tab in the second direction.

[0020] The width of the cathode coating portion in the second direction is the same as the width of the cathode tab in the second direction.

[0021] According to exemplary embodiments of the present invention, a battery cell including a large number of electrodes can be provided, thereby increasing the energy density of the battery cell. Furthermore, even though the battery cell includes a large number of electrodes, deterioration of the electrical properties of the battery cell can be prevented by injecting an electrolyte multiple times during the electrode lamination process. Furthermore, the production cost of a battery cell in which tab collectors are mechanically joined to a first case can be reduced, and throughput can be increased.

[0022] The effects that can be obtained from the exemplary embodiments of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood by those skilled in the art to which the exemplary embodiments of the present disclosure pertain from the following description. In other words, unintended effects resulting from practicing the exemplary embodiments of the present disclosure can also be derived by those skilled in the art from the exemplary embodiments of the present disclosure.

[0023] FIG. 1 is a flowchart illustrating a method for manufacturing a battery cell according to exemplary embodiments.

[0024] FIG. 2 is a flowchart illustrating a method for manufacturing a battery cell according to exemplary embodiments.

[0025] Figure 3 is a perspective view of a stack cell.

[0026] Figure 4 is an exploded perspective view of a stack cell.

[0027] Figures 5 to 7 illustrate the stacking of stack-collector modules.

[0028] Fig. 8 shows the fixation of the first tap collector and the second tap collector and the first case.

[0029] Figure 9 shows a portion of Figure 8.

[0030] Figure 10 shows the electrolyte injection process.

[0031] Figure 11 is a perspective view of a battery cell.

[0032] Figures 12 and 13 are partial perspective views of a battery cell.

[0033] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concepts of terms to best explain his or her invention, they should be interpreted in a way that conforms to the technical spirit of the present invention.

[0034] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention, and it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application.

[0035] In addition, when describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description is omitted.

[0036] Since the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, the shapes and sizes of components in the drawings may be exaggerated, omitted, or schematically illustrated for clearer explanation. Accordingly, the sizes and proportions of each component do not fully reflect the actual sizes or proportions.

[0037]

[0038] (Example 1)

[0039] FIG. 1 is a flowchart illustrating a method for manufacturing a battery cell according to exemplary embodiments.

[0040] FIG. 2 is a flowchart illustrating a method for manufacturing a battery cell according to exemplary embodiments. More specifically, FIG. 2 illustrates P120 of FIG. 1.

[0041] Figure 3 is a perspective view of a stack cell (110).

[0042] Figure 4 is an exploded perspective view of a stack cell (110).

[0043] Referring to FIGS. 1, 3, and 4, a stack cell (110) may be provided at P110. The stack cell (110) may be provided through a lamination process. The stack cell (110) may include an anode (111), a cathode (113), and a separator (115).

[0044] Hereinafter, the technical idea of ​​the present invention will be described with reference to an example in which the stack cell (110) is a mono cell including one anode (111), one cathode (113), and a separator (115) therebetween. However, this is for illustrative purposes only and does not limit the technical idea of ​​the present invention in any sense. A person skilled in the art will readily arrive at an embodiment in which the stack cell includes one or more anodes, one or more cathodes, and one or more separators that prevent short circuits between the anodes and cathodes based on the description herein.

[0045] The positive electrode (111) may include a positive electrode coating portion (111C) and a positive electrode tab (111T). The positive electrode tab (111T) may be connected to the positive electrode coating portion (111C). The positive electrode (111) may include a positive electrode current collector and a positive electrode active material layer including a positive electrode active material. The positive electrode active material layer may be partially applied to the positive electrode current collector. The positive electrode tab (111T) may be a portion of the positive electrode current collector that is exposed and not covered by the positive electrode active material layer. The positive electrode coating portion (111C) is a portion of the positive electrode (111C) that includes a positive electrode current collector and a positive electrode active material layer coated on the positive electrode current collector.

[0046] The thickness of the positive electrode current collector may range from about 3 μm to about 500 μm. The positive electrode current collector may not cause chemical changes in the secondary battery to be ultimately manufactured and may have high conductivity. The positive electrode current collector may include, for example, stainless steel, aluminum, nickel, titanium, calcined carbon, and aluminum. The positive electrode current collector may also include stainless steel surface-treated with carbon, nickel, titanium, silver, or the like. The surface of the positive electrode current collector may include a micro-roughened structure to increase the adhesion of the active material. The positive electrode current collector may have a shape such as a film, a sheet, a foil, a net, a porous material, a foam, or a non-woven fabric.

[0047] A cathode active material is a material capable of causing an electrochemical reaction. The cathode active material may be a lithium transition metal oxide. Examples of the cathode active material include layered compounds such as lithium cobalt oxide (LiCoO2) and lithium nickel oxide (LiNiO2) substituted with one or more transition metals; lithium manganese oxide substituted with one or more transition metals; chemical formula LiNi 1-y M y Lithium nickel oxide expressed as O2 (wherein, M is any one of Co, Mn, Al, Cu, Fe, Mg, B, Cr, Zn, and Ga, and 0.01≤y≤0.7); Li 1+z Ni 1 / 3 Co 1 / 3 Mn 1 / 3 O2, Li 1+zN i 0.4 Mn 0.4 Co 0.2 Li like O2 1+z Ni b Mn c Co 1-(b+c+d) M d O (2-e) A e(wherein, -0.5≤z≤0.5, 0.1≤b≤0.8, 0.1≤c≤0.8, 0≤d≤0.2, 0≤e≤0.2, b+c+d<1, M is any one of Al, Mg, Cr, Ti, Si, and Y, and A is any one of F, P, and Cl) Lithium nickel cobalt manganese composite oxide; chemical formula Li 1+x M 1-y M' y PO 4-z X z (wherein, M is a transition metal, more specifically, one of Fe, Mn, Co, and Ni, M' is one of Al, Mg, and Ti, X is one of F, S, and N, -0.5≤x≤+0.5, 0≤y≤0.5, and 0≤z≤0.1) and may include an olivine-based lithium metal phosphate.

[0048] The positive electrode coating portion (111C) and the positive electrode tab (111T) can be separated in the X direction. That is, the positive electrode active material layer may not cover the end of the positive electrode collector in the X direction, and the positive electrode tab (111T) may be connected to the end of the positive electrode coating portion (111C) in the X direction.

[0049] According to exemplary embodiments, the notching process may not be performed on the anode (111). Accordingly, the width of the anode coating portion (111C) in the Y direction may be substantially the same as the width of the anode tab (111T) in the Y direction.

[0050] At this time, the X direction and the Y direction are two directions substantially parallel to the positive electrode collector and the negative electrode collector, and the X direction and the Y direction can be substantially perpendicular to each other. The Z direction can be substantially perpendicular to each of the X direction and the Y direction.

[0051] The negative electrode (113) may include a negative electrode coating portion (113C) and a negative electrode tab (113T). The negative electrode tab (113T) may be connected to the negative electrode coating portion (113C). The negative electrode (113) may include a negative electrode current collector and a negative electrode active material layer including a negative electrode active material. The negative electrode active material layer may be partially applied to the negative electrode current collector. The negative electrode tab (113T) may be a portion of the negative electrode current collector that is exposed and not covered by the negative electrode active material layer. The negative electrode coating portion (113C) is a portion of the negative electrode (113) that includes a negative electrode current collector and a negative electrode active material layer coated on the negative electrode current collector.

[0052] The thickness of the negative electrode current collector may be in the range of about 3 μm to about 500 μm. The negative electrode current collector may not cause chemical changes in the secondary battery ultimately manufactured and may have high conductivity. The negative electrode current collector may include copper, stainless steel, aluminum, nickel, titanium, sintered carbon, and an aluminum-cadmium alloy. The negative electrode current collector may also include stainless steel surface-treated with carbon, nickel, titanium, silver, etc. The surface of the negative electrode current collector may include a micro-roughened structure to increase the adhesion of the active material. The negative electrode current collector may have a shape such as a film, a sheet, a foil, a net, a porous material, a foam, or a non-woven fabric.

[0053] The negative active material may include carbon, such as non-graphitizable carbon, graphitic carbon, etc. The negative active material may include, for example, Li x Fe2O3(0≤x≤1), LixWO2(0≤x≤1), Sn x Me 1-x Me' y O z(wherein Me is any one of Mn, Fe, Pb and Ge, and Me' is any one of Al, B, P, Si, elements of group 1, 2 and 3 of the periodic table and halogens; 0 <x≤1 이고; 1≤y≤3 이며; 1≤z≤8) 등의 금속 복합 산화물을 포함할 수 있다. 음극 활물질은, 예컨대, 리튬 금속; 리튬 합금; 규소계 합금; 주석계 합금을 포함할 수 있다. 음극 활물질은, 예컨대, SnO, SnO2, PbO, PbO2, Pb2O3, Pb3O4, Sb2O3, Sb2O4, Sb2O5, GeO, GeO2, Bi2O3, Bi2O4, Bi2O5등의 금속 산화물을 포함할 수 있다. 음극 활물질은, 예컨대, 폴리아세틸렌 등의 도전성 고분자; Li-Co-Ni 계 재료 등을 포함할 수 있다.

[0054] The negative electrode coating portion (113C) and the negative electrode tab (113T) can be separated in the X direction. That is, the negative electrode active material layer may not cover the X-direction end of the negative electrode current collector, and the negative electrode tab (113T) may be connected to the X-direction end of the negative electrode coating portion (113C). The negative electrode tab (113T) may be spaced apart from the positive electrode tab (111T) in the X direction.

[0055] According to exemplary embodiments, the notching process may not be performed on the cathode (113). Accordingly, the width of the cathode coating portion (113C) in the Y direction may be substantially the same as the width of the cathode tab (113T) in the Y direction.

[0056] The separator (115) may include an insulating material. The separator (115) may be interposed between the anode (111) and the cathode (113). The area of ​​the separator (115) may be larger than the area of ​​the anode coating portion (111C), and the area of ​​the separator (115) may be larger than the area of ​​the cathode coating portion (113C), and thus the separator (115) may prevent an unwanted short circuit between the anode (111) and the cathode (113).

[0057] According to exemplary embodiments, the separator (115) may include either polypropylene or polyethylene. According to exemplary embodiments, the separator (115) may be a porous film, thereby preventing short circuiting of the positive electrode (111) and the negative electrode (113) while providing a path for lithium ions to move between them.

[0058] According to exemplary embodiments, the positive tab (111T) and the negative tab (113T) of the stack cell (110) may be at opposite ends. According to exemplary embodiments, the positive tab (111T) and the negative tab (113T) of the stack cell (110) may be spaced apart in the X direction.

[0059]

[0060] Figures 5 to 7 illustrate the stacking of stack-collector modules.

[0061] Next, referring to FIGS. 1, 2, and 5 to 7, at P120, a stack-collector module may be stacked on a first case (130). The stack-collector module may include stack cells (110), a first tab collector (121), and a second tab collector (123). Stacking the stack-collector module on the first case (130) may include arranging the stack cells (110), the first tab collector (121), and the second tab collector (123) on the first case at P121, fixing the first tab collector (121) and the second tab collector (123) to the first case (130) at P123, and injecting an electrolyte at P125.

[0062]

[0063] In P121, stack cells (110), a first tab collector (121), and a second tab collector (123) may be arranged within a first case (130). According to exemplary embodiments, the first case (130) may include metal. The first case (130) may be a square metal can, but this is for illustrative purposes only and does not limit the technical idea of ​​the present invention in any sense. A person skilled in the art will readily arrive at an embodiment in which the case of the battery cell includes either a cylindrical can or an aluminum pouch based on the description herein.

[0064] A set number of stack cells (110), one first tab collector (121) and one second tab collector (123) can be used as a unit of repeated stacking to form a stack-collector module that is repeatedly provided to provide a completed battery cell (100, see FIG. 11).

[0065] The first case (130) may include a base plate and side walls connected to the base plate. The base plate may be substantially perpendicular to the Z direction. The side walls may be substantially perpendicular to the base plate.

[0066] An insulating case (140) may be provided within the first case (130). The insulating case (140) may include an insulating material. The insulating case (140) may be interposed between the first case (130) and the stack cells (110), and thus, the insulating case (140) may prevent unwanted short circuits between the stack cells (110) and the first case (130).

[0067]

[0068] The stack cells (110) may be stacked in the Z direction. In this example, the stack cells (110) may be connected in parallel. Accordingly, the positive tabs (111T) of each of the stack cells (110) may overlap in the Z direction, and the negative tabs (111T) of each of the stack cells (110) may overlap in the Z0 direction. The positive tabs (111T) of each of the stack cells (110) may be short-circuited to each other, and the negative tabs (111T) of each of the stack cells (110) may be short-circuited to each other.

[0069] According to exemplary embodiments, the first tab collector (121) may overlap with the positive electrode tab (111T) of each of the stack cells (110) in the Z direction. According to exemplary embodiments, the first tab collector (121) may be short-circuited with the positive electrode tab (111T) of each of the stack cells (110). According to exemplary embodiments, the first tab collector (121) may press the positive electrode tab (111T) of each of the stack cells (110), and thus, a stable electrical connection between the positive electrode tabs (111T) of the stack cells (110) may be secured. According to exemplary embodiments, the first tab collector (121) may be in contact with the positive electrode tab (111T) of the uppermost stack cell (110).

[0070] According to exemplary embodiments, the first tab collector (121) may extend in the Y direction. According to exemplary embodiments, the first tab collector (121) may have a rod shape. According to exemplary embodiments, there may be first fastening holes (121H) at each of the Y ends of the first tab collector (121). More specifically, according to exemplary embodiments, the first tab collector (121) may include surfaces substantially perpendicular to the Y direction at each of the Y ends, and the first tab collector (121) may include first fastening holes (121H) recessed in the Y direction from the surfaces. The first fastening holes (121H) may be used for rivet-free fastening.

[0071] According to exemplary embodiments, the second tab collector (123) may overlap with the negative tab (113T) of each of the stack cells (110) in the Z direction. According to exemplary embodiments, the second tab collector (123) may be short-circuited with the negative tab (113T) of each of the stack cells (110). According to exemplary embodiments, the second tab collector (123) may press the negative tab (113T) of each of the stack cells (110), and thus, a stable electrical connection between the negative tabs (113T) of the stack cells (110) may be secured. According to exemplary embodiments, the second tab collector (123) may be in contact with the negative tab (113T) of the uppermost stack cell (110).

[0072] According to exemplary embodiments, the second tab collector (123) may extend in the Y direction. According to exemplary embodiments, the second tab collector (123) may have a rod shape. According to exemplary embodiments, there may be fastening holes (123H) at each of the Y ends of the second tab collector (123). More specifically, according to exemplary embodiments, the second tab collector (123) may include surfaces substantially perpendicular to the Y direction at each of the Y ends, and the second tab collector (123) may include fastening holes (123H) recessed from the surfaces in the Y direction. The fastening holes (123H) may be used for rivet-free fastening.

[0073]

[0074] Fig. 8 shows the fixation of the first tab collector (121) and the second tab collector (123) and the first case (130).

[0075] Figure 9 shows a portion (POR8) of Figure 8.

[0076] Next, referring to FIGS. 2, 8 and 9, at P123, the first tab collector (121) and the second tab collector (123) can be fixed to the first case (130). The first tab collector (121) and the second tab collector (123) can be fixed to the first case (130) by the Torx-Clinching technology of TorxPressTechnics, but this is for illustrative purposes only and does not limit the technical idea of ​​the present invention in any sense. The first tab collector (121) and the second tab collector (123) can be fixed to the first case (130) by any technology that allows rivet-free joining.

[0077] The first tab collector (121) and the first case (130) can be fixed by applying a tool to the first case (130) so that portions of the first case (130) are inserted into the first fastening holes (121H) of the first tab collector (121). During tooling of the first case (130), the first case can undergo phases such as compression, contour formation, and lateral expansion. Accordingly, the first case (130) and the insulating case (140) can be deformed to fill the first fastening holes (121H), and the first case (130) and the first tab collector (121) can be fixed to each other.

[0078] The second tab collector (123) and the first case (130) can be fixed by applying a tool to the first case (130) so that portions of the first case (130) are inserted into the second fastening holes (123H) of the second tab collector (123). During tooling of the first case (130), the first case may undergo compression, contour formation, lateral expansion, and the like. Accordingly, the first case (130) and the insulating case (140) can be deformed to fill the second fastening holes (123H), and the first case (130) and the second tab collector (123) can be fixed to each other.

[0079] By the above-described deformation, first and second dents (130D1, 130D2) can be formed in the first case (130). The first dent (130D1) can overlap the first tab collector (121) in the Y direction. The first dent (130D1) can be a deformation portion of the first case (130) that fills the first fastening holes (121H) of the first tab collector (121). The first dent (130D1) can fix the first tab collector (121).

[0080] The second dent (130D2) may overlap the second tab collector (123) in the Y direction. The second dent (130D2) may be a deformed portion of the first case (130) that fills the second fastening holes (123H) of the second tab collector (123). The second dent (130D2) may secure the second tab collector (123).

[0081]

[0082] Figure 10 shows the electrolyte (EL) injection process.

[0083] Next, referring to FIGS. 2 and 10, at P125, an electrolyte (EL) can be injected into the first case (130). According to exemplary embodiments, even when a large number of stack cells (110) are stacked in the first case (130), by dividing and injecting the electrolyte based on the stacking of a plurality of cell-collector modules, the electrolyte (EL) can be efficiently absorbed into each of the stack cells (110), and thus, the reliability of the battery cell (100, see FIG. 11) ultimately provided can be provided.

[0084] P125 and P123 may be performed in the reverse order. For example, in P125, the electrolyte (EL) may be first injected into the first case (130), and then in P123, the first tab collector (121) and the second tab collector (123) may be fixed to the first case (130).

[0085]

[0086] Figure 11 is a perspective view of a battery cell (100).

[0087] Figures 12 and 13 are partial perspective views of a battery cell (100).

[0088] Referring to FIGS. 1, 3, 4, and 11 to 13, at P130, if the target number of stacks is not reached (NO), P120 can be repeatedly performed. Accordingly, as illustrated in FIGS. 12 and 13, a plurality of cell-collector modules can be stacked in the Z direction.

[0089] Accordingly, the first case (130) may include a plurality of first dents (130D1) and a plurality of second dents (130D2). The plurality of first dents (130D1) may be arranged along the Z direction. The plurality of first dents (130D1) may overlap in the Z direction. The plurality of second dents (130D2) may be arranged along the Z direction. The plurality of second dents (130D2) may overlap in the Z direction.

[0090] Adjacent first tap collectors (121) may be spaced apart with positive tabs (111T) interposed therebetween. Adjacent first tap collectors (121) may be electrically connected via the positive tabs (111T).

[0091] Adjacent second tap collectors (123) may be spaced apart with negative taps (113T) therebetween. Adjacent second tap collectors (123) may be electrically connected via the negative taps (113T).

[0092]

[0093] Referring to FIGS. 1, 11, and 13, at P130, when the target number of layers is reached, the second case (150) may be welded to the first case (130). The second case (150) may be, for example, a cap of a metal can, but is not limited thereto. According to exemplary embodiments, the second case (150) and the first case (130) may be joined by either ultrasonic welding or laser welding.

[0094] The second case (150) can cover a plurality of stack cells (110), a plurality of first tab collectors (121), and a plurality of second tab collectors (123) stacked on the first case (130). The second case (150) can include a positive terminal (151) short-circuited with the plurality of first tab collectors (121) and a negative terminal (153) short-circuited with the plurality of second tab collectors (123). The resulting voltage and current of the battery cell (100) can be output through the positive terminal (151) and the negative terminal (153).

[0095] Referring to FIG. 3 and FIG. 11 to FIG. 13, a battery cell (100) may be provided by combining a second case (150) and a first case (130). The battery cell (100) may include a plurality of stack cells (110), a plurality of first tab collectors (121), a plurality of second tab collectors (123), a first case (130), an insulating case (140), and a second case (150).

[0096] A plurality of stack cells (110) may overlap in the Z direction. The plurality of stack cells (110) may be stacked in the Z direction. An anode tab (111T) of each anode (111) of each of the plurality of stack cells (110) may overlap with a plurality of first tab collectors (121) in the Z direction. The anode tab (111T) of each anode (111) of each of the plurality of stack cells (110) may be short-circuited with the plurality of first tab collectors (121). A cathode tab (113T) of each cathode (113) of each of the plurality of stack cells (110) may overlap with a plurality of second tab collectors (123) in the Z direction. A cathode tab (113T) of each cathode (113) of each of the plurality of stack cells (110) may be short-circuited with a plurality of second tab collectors (123).

[0097]

[0098] The present invention has been described in more detail through drawings and examples. However, the configurations described in the drawings or examples described in this specification are merely embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as of the time of this application.

Claims

1. A first case including a base plate; A plurality of stack cells on the base plate, each of the plurality of stack cells including an anode, a cathode, and a separator interposed between the anode and the cathode; a plurality of first tab collectors on the base plate; and A battery cell characterized by comprising a plurality of second tab collectors on the base plate.

2. In paragraph 1, A battery cell characterized in that the first tab collectors are spaced apart from the second tab collectors in a first direction.

3. In paragraph 2, A battery cell, characterized in that each of the first tab collectors and each of the second tab collectors extends in a second direction perpendicular to the first direction.

4. In paragraph 3, A battery cell, wherein each of the first tab collectors includes first fastening holes.

5. In paragraph 4, A battery cell characterized in that the first fastening holes are at the ends in the second direction.

6. In paragraph 5, A battery cell characterized in that the first case partially fills the first fastening holes.

7. In paragraph 5, The first case includes first dents that partially fill the first fastening holes, and A battery cell characterized in that the first dents are arranged along a third direction perpendicular to the first and second directions.

8. In paragraph 7, The above first tap collectors are arranged along the third direction, and A battery cell characterized in that the second tab collectors are arranged along the third direction.

9. In paragraph 6, Each of the second tab collectors includes second fastening holes, and A battery cell characterized in that the first case partially fills the second fastening holes.

10. In paragraph 1, Each of the anodes of the plurality of stack cells includes an anode coating portion and an anode tab connected to the anode coating portion, Each of the cathodes of the plurality of stack cells includes a cathode coating portion and a cathode tab connected to the cathode coating portion, and A battery cell characterized in that the positive tab of each of the plurality of stack cells is spaced apart from the negative tab of each of the plurality of stack cells in a first direction.

11. In paragraph 10, A battery cell characterized in that the width of the positive electrode coating portion in the second direction perpendicular to the first direction is the same as the width of the positive electrode tab in the second direction.

12. In paragraph 11, A battery cell characterized in that the width of the negative electrode coating portion in the second direction is the same as the width of the negative electrode tab in the second direction.

13. In paragraph 1, Further comprising a second case coupled to the first case, and A battery cell characterized in that the second case includes a positive terminal short-circuited with the plurality of first tab collectors and a negative terminal short-circuited with the plurality of second tab collectors.

14. In paragraph 1, The positive electrode tab of each of the corresponding ones of the plurality of stack cells is interposed between the first tab collectors, and A battery cell characterized in that the negative tabs of the negative electrodes of each of the corresponding ones of the plurality of stack cells are interposed between the second tab collectors.

15. A first case including a base plate; A plurality of stack cells on the base plate, each of the plurality of stack cells including an anode, a cathode, and a separator interposed between the anode and the cathode; a plurality of first tab collectors on the base plate; and Including a plurality of second tab collectors on the base plate, Each of the anodes of the plurality of stack cells includes an anode coating portion and an anode tab connected to the anode coating portion, Each of the cathodes of the plurality of stack cells includes a cathode coating portion and a cathode tab connected to the cathode coating portion, The positive tab of each of the plurality of stack cells is spaced apart from the negative tab of each of the plurality of stack cells in a first direction, and A battery cell characterized in that the width of the positive electrode coating portion in the second direction perpendicular to the first direction is the same as the width of the positive electrode tab in the second direction.

16. In paragraph 15, A battery cell characterized in that the width of the negative electrode coating portion in the second direction is the same as the width of the negative electrode tab in the second direction.

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