Battery cell for an energy storage device and method of manufacturing the same

Abstract

The present disclosure relates to an electrical cell (10) for an energy storage device (20), the electrical cell comprising: a first conductive substrate (12), a second conductive substrate (14), and a separator substrate (16) disposed between the first conductive substrate and the second conductive substrate, wherein the first conductive substrate, the second conductive substrate, and the separator substrate are disposed in a plurality of overlapping layers in a jellyroll form. The first conductive substrate comprises a plurality of first tabs (120), the plurality of first tabs comprising first outer tabs extending from an outer layer of the plurality of overlapping layers and first inner tabs extending from an inner layer of the plurality of overlapping layers, the inner layer being closer to a center of the jellyroll form than the outer layer, a length of the first outer tabs being longer than a length of the first inner tabs, and the plurality of first tabs being folded toward the center of the jellyroll form such that adjacent ones of the plurality of first tabs contact each other.

Description

Technical Field

[0001] This disclosure relates to a battery cell for use in an energy storage device, a method for manufacturing the battery cell, an energy storage device, and a vehicle including the energy storage device. Background Technology

[0002] In current prismatic cells, after the jelly roll terminals are formed, the roll containing anode and cathode materials is rolled up or stacked. The terminals are typically formed in multiple process steps involving crimping, cutting, and soldering tab materials to the substrate. Dedicated current collectors are then soldered to each tab of the anode and cathode materials. The current collectors soldered to the anode and cathode materials are then soldered or riveted to the external terminals of the prismatic cell. This multi-interface design, involving multiple soldering operations, increases resistance and reduces the volumetric efficiency of the prismatic cell.

[0003] High internal resistance is one of the major technical obstacles for prismatic battery cells today. Higher internal resistance leads to longer charging times and interferes with the derating charging power of prismatic cells. Derating the charging power is often necessary to limit heat loss and prevent permanent damage to the prismatic cell.

[0004] Furthermore, low volumetric efficiency is another example of a major technological obstacle for prismatic cells today. If volumetric efficiency could be improved, more active material could be used for both the anode and cathode, resulting in greater battery capacity. Summary of the Invention

[0005] The subject matter of this disclosure at least partially solves or mitigates the aforementioned problems.

[0006] According to a first aspect, a battery cell for an energy storage device is provided, the battery cell comprising: a first conductive substrate, a second conductive substrate, and a separator substrate disposed between the first conductive substrate and the second conductive substrate, wherein the first conductive substrate, the second conductive substrate, and the separator substrate are arranged in a battery cell form in the form of a plurality of overlapping layers (e.g., rolled up, stacked, and / or folded), wherein the first conductive substrate includes a plurality of first tabs, wherein the plurality of first tabs includes a first outer tab extending from an outer layer of the plurality of overlapping layers and a first inner tab extending from an inner layer of the plurality of overlapping layers, the inner layer being located closer to the center of the battery cell form than the outer layer, wherein the length of the first outer tab is longer than the length of the first inner tab, and wherein the plurality of first tabs are folded toward the center of the battery cell form such that adjacent first tabs among the plurality of first tabs are in contact with each other.

[0007] In one example, the cell form may include a flat geometry having two opposite first faces and two opposite second faces connecting the first faces to each other, the first faces being substantially planar and the second faces being substantially curved.

[0008] Generally, the cell can have any cell form in which the individual substrates are arranged relative to each other and / or arranged within the cell. For example, the substrates can be rolled up, stacked, and / or folded. Thus, the cell can be, for example, a rolled core, a rolled core stack, and / or a rolled core fold. In other words, the cell form can be a rolled core form, a rolled core stack form, a rolled core fold form, or any combination of these forms. A rolled core can be prepared by rolling up different substrates, particularly substrate layers, as described herein. A rolled core stack can be formed by stacking, wherein the substrates are stacked on top of each other, particularly in the form of layers or sheets. Typically, substrate layers of different lengths can be cut and then arranged sequentially to form a rolled core stack. For folding, for example, a rolled core fold, or in other words, a rolled core fold body or rolled core fold form, can be made, for example, by zigzag folding or vertical folding. For example, the separator substrate or separator can be arranged in a continuous zigzag shape within the rolled core fold form. The first and second conductive substrates can be inserted into each zigzag of the zigzag separator substrate or between each zigzag of the zigzag separator substrate, particularly sequentially. Any exemplary reference to core form in this document also refers to or may be replaced by core folding form, core stacking form, or any combination of these three forms.

[0009] The energy storage device is an energy storage device used to store energy. The energy storage device can be any supercapacitor, battery, and / or thermal energy storage system. The cell used in the energy storage device can be the smallest building block of the energy storage device. For example, a battery can be a single-cell battery or may include multiple cells. A cell can refer to a single anode and cathode separated by an electrolyte used to generate voltage and current. Conductive substrates, such as a first conductive substrate and a second conductive substrate, can be conductive substrates. The conductive substrate is not limited to any type of conduction. For example, the conductive substrate can be conductive. The first conductive substrate and the second conductive substrate can be the anode and cathode of the energy storage device, respectively. The separating substrate can be a substrate that separates the first conductive substrate from the second conductive substrate. The separating substrate can be permeable. In other words, the separating substrate can be a permeable membrane placed between the first conductive substrate and the second conductive substrate. For example, the separating substrate can be placed between the anode and cathode of the battery to physically separate the anode and cathode, i.e., keeping the two electrodes separate to prevent short circuits, while allowing ions to be transported during current flow in the cell to close the circuit.

[0010] For example, a wound cell can refer to a construction used in cylindrical or prismatic rechargeable batteries, including but not limited to nickel-cadmium, nickel-metal hybrid, and lithium-ion batteries. Typically, the cell form can be a wound cell form. Such a wound cell form can have a wound, stacked, and / or folded appearance. For example, a wound form includes a cross-section with a wound appearance. The wound form can be formed by rolling up substrate layers. In this disclosure, a first conductive substrate, a second conductive substrate, and a separator substrate can be rolled up in a wound form. The wound form can be used for cylindrical or prismatic batteries.

[0011] In the case of a prismatic battery, the substrate can be pressed, rolled up, stacked, and / or folded, such that the cell form, for example, a wound cell, includes a flat geometry. The flat geometry can remain in the cell or wound cell form, such as a wound cell, and simultaneously, the flat geometry can include two opposite first faces and two opposite second faces connecting the first faces to each other. "The first face is substantially planar" can mean that the first face forms a substantially planar plane. "The second face is substantially curved" can mean that the second face is curved such that each end of the second face connects to the opposite first face through the curved second face. A plurality of first tabs can be made of the same material as the first conductive substrate. The plurality of first tabs can be manufactured together with the first conductive substrate or attached to the first conductive substrate after it has been manufactured on the first conductive substrate itself. Optionally, the plurality of first tabs can be made of a material different from that of the first conductive substrate. The plurality of first tabs can be arranged on one side such that when the first conductive substrate is rolled up to form a wound cell form, the plurality of first tabs do not roll up together. The plurality of first tabs can refer to components extending from one side of a plurality of overlapping layers and facing each other. When the first conductive substrate is wound up as a core of multiple overlapping layers, the first outer tab can be understood as a tab disposed on the outer layer of the multiple overlapping layers of the first conductive substrate. Similarly, the first inner tab can be understood as a tab disposed on the inner layer of the multiple overlapping layers of the first conductive substrate. The length of a tab, such as the first outer tab or the first inner tab, can represent the length of the tab itself from the edge of the first conductive substrate on which the tab is disposed to the end of the tab opposite to the edge of the first conductive substrate. In other words, the length of the tab can refer to the length of the portion of the tab extending from the first conductive substrate. In one example, the first outer tab may be adjacent to the first inner tab. In other words, the first outer tab may extend from one of the multiple overlapping layers of the first conductive substrate, and the first inner tab may extend from another of the multiple overlapping layers of the first conductive substrate, wherein the two layers are adjacent to each other.

[0012] Folding can refer to bending or deflection. Folding multiple first tabs towards the center of the cell form can mean that multiple first tabs are bent such that a first outer tab rests on a first inner tab. Because the first outer tab is longer than the first inner tab, when multiple first tabs are folded towards the center of the cell form, the first outer tab can contact the first inner tab with a larger area compared to when the first outer and first inner tabs are of equal length. While preferably, the outer tab adjacent to the inner tab is longer than the inner tab, it is not necessary that each outer tab is longer than the tab adjacent to that outer tab and closer to the center of the cell form. The outer tab can be the first outer tab, and the inner tab can be the first inner tab. When adjacent first tabs are in contact with each other, the adjacent first tabs can form terminals of the first conductive substrate. The multiple first tabs folded towards the center of the cell form and in contact with each other can be rigid and / or sufficiently robust to withstand pressure applied to the multiple first tabs. For example, the multiple first tabs can be rigid enough to be directly soldered to another component. In another example, the multiple first tabs are strong enough to support the weight of the cell when the multiple first tabs are located on the underside of the cell.

[0013] According to one example, each of the plurality of first tabs may contact only one or two directly adjacent first tabs. In other words, the plurality of first tabs do not contact other portions of the first conductive substrate or even the second conductive substrate. By contacting only one or two directly adjacent first tabs, short circuits, such as short circuits between the first and second conductive electrodes, i.e., short circuits between the anode and cathode, can be prevented.

[0014] According to one example, the lengths of multiple first tabs gradually decrease in the direction toward the center of the cell form. As mentioned above, it is not necessary for each outer tab to be longer than the tab adjacent to that outer tab and closer to the center of the cell form. However, when the lengths of the multiple first tabs gradually decrease in the direction toward the center of the cell form, i.e., when each first outer tab is longer than the first inner tab closer to the center of the cell form, the multiple first tabs can be folded such that each first outer tab lies on its corresponding adjacent first inner tab with sufficient overlap. The layer formed by this example is able to more rigidly resist the pressure applied to the multiple first tabs. For example, the folded multiple first tabs can be strong enough to be directly welded to, for example, a cover. Typically, these tabs extending from the conductive substrate are very thin and easily break if force is applied to them. Therefore, in the prior art, there is a need for a structure that keeps the tabs intact or unbreakable while providing a conductive connection to another part (e.g., a cover forming a terminal). In contrast, the multiple first tabs folded toward the center of the cell form according to this example are strong enough that the multiple first tabs can be directly welded to another component. Note that the cell according to the first aspect can also provide the strength of multiple first tabs. In this example, the strength or stiffness of the multiple first tabs is further enhanced because each outer tab can be located on an adjacent inner tab.

[0015] According to one example, the second conductive substrate may include a plurality of second tabs disposed on opposite sides of a plurality of first tabs. The plurality of second tabs includes second outer tabs extending from an outer layer of a plurality of overlapping layers and second inner tabs extending from an inner layer of a plurality of overlapping layers, wherein the length of the second outer tab is longer than the length of the second inner tab, and wherein the plurality of second tabs are folded toward the center of the cell form such that adjacent second tabs are in contact with each other. The second conductive substrate can be understood accordingly to be similar to the first conductive substrate. The plurality of second tabs may correspond to the plurality of first tabs. The second outer tab and the second inner tab can be understood accordingly to be the same as the first outer tab and the first inner tab. Generally, those skilled in the art will understand that, in this example, the corresponding features can be applied to the plurality of second tabs as in the plurality of first tabs. The difference is that the plurality of second tabs may be disposed on opposite sides of the plurality of first tabs. In other words, the plurality of second tabs may extend from the second conductive substrate, but from opposite sides in the cell form. In this way, multiple first electrodes and multiple second electrodes are arranged on different sides, and short circuits between multiple first electrodes and multiple second electrodes can be geometrically prevented.

[0016] According to a second aspect, a method for manufacturing a battery cell according to the first aspect is provided, the method comprising: providing a foil of a first conductive material, a second conductive substrate, and a separator substrate; laser-processing the foil to cut a first conductive substrate including a plurality of first tabs from the first conductive material; stacking the first conductive substrate, the second conductive substrate, and the separator substrate to form a plurality of overlapping layers; arranging (e.g., rolling, stacking, and / or folding) the first conductive substrate, the second conductive substrate, and the separator substrate to form a battery cell form, particularly a battery cell form including a flat geometry; and folding the plurality of first tabs toward the center of the battery cell form such that adjacent first tabs among the plurality of first tabs are in contact with each other.

[0017] The foil can be a sheet-like material, such as metal, suitable for being rolled up to form a battery cell. The first conductive material can be copper foil, which is the anode material of a lithium-ion battery. However, this disclosure is not limited to this, and the first conductive material can be any other material suitable for use as an anode material in a lithium-ion battery. Furthermore, the first conductive material can be any other material suitable for use as a first conductive material in any other energy storage device. Additionally, the first conductive material can be a cathode material for a lithium-ion battery. Note that the second aspect can also be similarly applied to a battery cell with multiple second tabs manufactured from a second conductive material. The first and second conductive materials can be materials suitable for forming an energy storage device together. Therefore, if the first conductive material is the anode material of a lithium-ion battery, the second conductive material can be a cathode material of a lithium-ion battery, such as aluminum.

[0018] When the first foil is laser-processed to cut out a first conductive substrate comprising a plurality of first tabs, the plurality of first tabs naturally have a first foil made of the same material as the first conductive substrate. Furthermore, in this way, the manufacturing of the first conductive substrate can be simplified because the plurality of first tabs do not need to be attached after the first conductive substrate is manufactured. The plurality of first tabs can be laser-processed such that two first tabs arranged at the same distance from the center of the cell have equal heights. Thus, the cell can have a symmetrical geometry.

[0019] According to a third aspect, an energy storage device is provided, comprising: a battery cell according to a first aspect and a housing having a generally prismatic shape, wherein the housing at least partially houses the battery cell, and wherein the housing includes opposite ends forming electrical terminals of the energy storage device.

[0020] Energy storage devices can be prismatic batteries, i.e., batteries with prismatic cell housings. The housing can be a rigid casing that encloses and protects device components, such as the cells. Since battery cells can be very delicate, it is necessary to house the cells at least partially within such a housing. Therefore, the housing can be made of rigid materials, such as aluminum or aluminum alloys, stainless steel, and plastic. The essentially prismatic shape is advantageous for better space utilization compared to cylindrical cells. "At least partially housing the cells" can mean that the housing does not need to completely enclose the cells. For example, the housing can have holes, openings, slots, or open sides. If the housing can at least partially house the cells, it may be sufficient. Electrical terminals can be each of an anode terminal and a cathode terminal. Terminals can be points that can be connected to a circuit. Electrical terminals can be terminals connecting a first conductive substrate to a second conductive substrate. Because the cells according to the first aspect have a robust structure, any conventional prismatic cell design has the advantage of greater robustness if cells according to the first aspect are used. Furthermore, energy storage devices can include multiple cells according to the first aspect and housings that at least partially house multiple cells.

[0021] According to one example, the energy storage device may further include a cover comprising a conductive material, and wherein the cover is welded to a plurality of first tabs on a first conductive substrate of the battery cell, thereby forming a first electrical terminal in the electrical terminals at one of the opposite ends of the energy storage device. As described above, the plurality of first tabs may have sufficient compressive stiffness and be robust enough to be directly welded to the cover. In conventional designs, spacers may be necessary because the tabs are not robust enough to be welded. Thus, spacers can provide both protection and connection. However, including such spacers in the energy storage device design may result in a larger volume and may be space-inefficient. Therefore, the energy storage device according to this example, which does not require spacers, can have better volume utilization.

[0022] According to one example, a cover may be positioned at the lower end of the opposite end of the housing, and the cover and housing may enclose the battery cell. In other words, a first electrical terminal may be located at the lower end of the housing. The cover may fill in any missing portion of the housing, thereby substantially completely enclosing the battery cell with the housing. The cover and housing may be connected to each other to form a stable housing for the battery cell. Enclosing the battery cell may refer to surrounding the battery cell to keep it separated from other areas or portions.

[0023] According to one example, the housing may include a conductive material forming the first electrical terminal. When the housing includes a conductive material, the housing can be conductive and can allow current to pass through a cover soldered to a plurality of first tabs. In other words, the first electrical terminal can extend from the plurality of first tabs through the cover into the housing. Therefore, in this example, the housing itself can function as the first electrical terminal.

[0024] According to one example, the energy storage device may also include a current collector located below the upper end of the opposite end of the housing, wherein the current collector is substantially flat and disposed on and in contact with the second conductive substrate of the battery cell. For example, the size of the current collector may be approximately the same as the size of the upper surface of the housing having an approximately prismatic shape. The current collector may contact the second conductive substrate through multiple portions of the second conductive substrate. When the second conductive substrate includes multiple second tabs, the current collector may contact a portion of said multiple second tabs. Because this current collector can contact a larger area of ​​the second conductive substrate of the battery cell compared to conventional techniques using smaller current collectors, the energy storage device will experience less bottleneck effect and thus generate less heat due to the bottleneck effect.

[0025] According to one example, the energy storage device may further include an electrical isolation layer disposed between the current collector and the upper end of the housing. Since the housing may include a conductive material and may form the first electrical terminal itself, the electrical isolation layer can be disposed between the current collector and the upper end of the housing. Therefore, the electrical isolation layer has the effect of preventing short circuits in the energy storage device.

[0026] According to one example, each of the housing and the electrical isolation layer may include a hole, wherein the holes are aligned with each other to form a second electrical terminal among the plurality of electrical terminals, the second electrical terminal being connected to the current collector at the upper end of the housing. The housing may include a hole located at the upper end of the housing. The upper end can be understood as the upper surface. Therefore, the holes in the electrical isolation layer and the holes in the housing can be aligned to minimize the distance between these holes. Preferably, but not necessarily, the holes in the current collector and the holes in the housing can have the same shape and the same size. The holes in the housing can be large enough to allow easy access to the current controller, but small enough for the housing to accommodate the battery cell. Using these holes, the current collector, which contacts the second conductive substrate of the battery cell, can be accessed, while the electrical isolation layer prevents short circuits. Since the current collector contacts the second conductive substrate, the current collector accessible through these holes can be understood as the second electrical terminal.

[0027] In one example, the first electrical terminal may be the anode terminal of an energy storage device, and the second electrical terminal may be the cathode terminal of an electrical device.

[0028] According to one example, the housing may include nickel steel. For example, the first conductive substrate may include copper. As an example, the cover may include a nickel-aluminum alloy (Ni-Alu). For example, the anode material of a lithium-ion battery may be copper, while the cathode material may be aluminum. Therefore, in one example, the first conductive material may be copper, and the second conductive material may be aluminum.

[0029] For a conductive housing design according to an example, the conductive material of the housing should be considered as a material suitable for connection to a first conductive material. The housing can be connected to multiple first tabs made of the first conductive material by a cover that is directly welded to multiple first tabs. Typically, the first conductive material may include copper, and the housing may be made of aluminum. However, welding copper and aluminum is technically undesirable because they have very different coefficients of thermal expansion, which could lead to poor quality of the energy storage device. Therefore, the conductive material of the cover should be considered as a material suitable for welding and / or connecting to both the first conductive substrate and the conductive material of the housing. Alternatively, the conductive material of the housing may be considered to be different from typical aluminum.

[0030] As one example, the conductive material of the casing is preferably nickel steel. Steel is more cost-effective compared to aluminum.

[0031] As an example, possible and feasible materials for the cap could be a nickel-copper alloy (Ni-Cu) or a nickel-aluminum alloy (Ni-Alu). While both materials can be used as conductive materials for the cap, the nickel-aluminum alloy is preferred. Caps incorporating nickel-aluminum alloys may be more cost-effective for energy storage designs compared to the heavier and more expensive nickel-copper alloys.

[0032] Therefore, the combination of a shell conductive material containing nickel steel, a cover conductive material containing nickel-aluminum alloy, and a first conductive material containing copper is not only cost-effective but also lighter in weight.

[0033] According to the fourth aspect, a vehicle is provided that includes an energy storage device according to the third aspect.

[0034] It should be noted that the examples above can be combined with each other, regardless of the aspects involved. Therefore, this method can be combined with structural features, and similarly, battery cells, energy storage devices, and vehicles can be combined with the features described above regarding this method.

[0035] These and other aspects of this disclosure will become apparent and clarified through the embodiments described below. Attached Figure Description

[0036] Embodiments of this disclosure are described below with reference to the accompanying drawings.

[0037] Figure 1 A cross-sectional view of a core form according to one aspect of this disclosure is shown.

[0038] Figure 2a A cross-sectional view of a first conductive substrate in the form of a coil with multiple folded first tabs is shown.

[0039] Figure 2b It shows Figure 2aThe first conductive substrate shown is in the form of a coil, but in which a plurality of first tabs are folded toward the center of the coil.

[0040] Figure 3 The first conductive substrate is shown before it is rolled up in the form of a core.

[0041] Figure 4 A perspective view of the interior of an energy storage device without an electrical isolation layer is shown.

[0042] Figure 5 As shown Figure 4 The energy storage device shown has an internal structure, but with an electrical isolation layer.

[0043] Figure 6 A perspective view of a cross-sectional area of ​​an energy storage device is shown.

[0044] Figure 7 Another cross-sectional view of another cross-sectional area of ​​the energy storage device is shown.

[0045] Figure 8 A cross-sectional view of the energy storage device is shown. Detailed Implementation

[0046] The accompanying drawings are merely illustrative and are intended only to illustrate examples of the content of this disclosure. Identical or equivalent elements generally have the same reference numerals.

[0047] Figure 1 A cross-sectional view of a core form according to one aspect of this disclosure is shown. Alternatively, Figure 1 and Figure 2 to Figure 8 The core can be in the form of a stacked, folded, or bent sheet. Alternatively, the cell can include any other cell form having a shape or form in which the substrates are disposed opposite each other. The features described herein are equally applicable to these other forms.

[0048] Figure 1 The core form exemplarily includes a flat geometry having two opposite first faces 1 and two opposite second faces 2. The two opposite second faces 2 connect the two opposite first faces 1. The first faces 1 are substantially flat, and the second faces 2 are substantially curved.

[0049] Figure 2a A cross-sectional view of a first conductive substrate in the form of a coil with multiple folded first tabs is shown. Figure 2b It shows Figure 2a The image shows a cross-sectional view of a first conductive substrate in the form of a coil, but with multiple first tabs folded toward the center of the coil. In each Figure 2a and Figure 2bThe image shows a plurality of first tabs 120. The battery cell 10 includes a first conductive substrate wound in a core configuration and includes a plurality of first tabs 120. (See image for details.) Figure 2a As shown, the length of the multiple first tabs 120 gradually decreases in the direction toward the center of the core. Figure 2b A cell 10 according to a first aspect is shown, wherein a plurality of first tabs 120 are folded toward the center in a coiled core form, such that adjacent first tabs are in contact with each other. Figure 2b In the diagram, it can be seen that multiple first electrodes 120 are not in contact with each other; however, this is merely for illustrative purposes and the present disclosure is not limited thereto.

[0050] Figure 3 A first conductive substrate 12 is shown before being rolled up in a core form. When the first conductive substrate 12 is laser-processed from a foil, a plurality of first tabs 120 of the first conductive substrate 12 can be laser-processed together. The plurality of first tabs 120 can be laser-processed such that the length of the outer tab is longer than the length of the inner tab. In an example where the plurality of first tabs 120 includes six first tabs, the lengths of the six first tabs can be as follows: Figure 3 As shown. Since the first conductive substrate 12, rolled up in a core-like form, will be in a symmetrical configuration, every two first contacts can be laser-processed to have the same length. Specifically, the height of the first two tabs can be h1, the height of the next two tabs can be h2, and the height of the last two tabs can be h3. Figure 3 As shown, h3 is longer than h2 and h2 is longer than h1. Figure 3 The dashed vertical line in the diagram can be understood as the position that repeats 360° when the first conductive substrate 12 is rolled up in a core-like manner. Therefore, the first conductive substrate 12 and the plurality of first tabs 120 can be manufactured such that the length of the outer tab is longer than the length of the inner tab.

[0051] Figure 4 This shows a perspective view of the interior of an energy storage device without an electrical isolation layer. Figure 4 In the diagram, only a portion of the housing 22 of the energy storage device is shown in an illustrative perspective view. Specifically, Figure 4 The upper surface of housing 22 is omitted. The energy storage device may include a current collector 26. The current collector 26 may be disposed below the upper surface of housing 22, which is located below... Figure 4 Not shown in the diagram. Collector 26 may be substantially flat.

[0052] Figure 5 Showing with Figure 4 A similar perspective view, but also showing the electrical isolation layer 28. (As shown) Figure 5 As shown, an electrical isolation layer 28 can be disposed on the current collector 26. The electrical isolation layer 28 may include, for example... Figure 5The hole shown. This hole can form a second electrical terminal with a path to the current collector 26.

[0053] Figure 6 A perspective view of a cross-sectional area of ​​the energy storage device is shown. Figure 6 In the middle, you can also see Figure 5 The hole shown. In addition... Figure 6 The openings in housing 22 are shown. The openings in housing 22 and the openings in electrical insulation layer 28 can be aligned to form a second electrical terminal. (See diagram.) Figure 6 As shown, the openings in housing 22 and electrical isolation layer 28 do not necessarily have to be the same size. The current collector 26 can be accessed through the openings in housing 22 and electrical isolation layer 28. The current collector 26 can contact multiple second tabs 140. Therefore, a second electrical terminal can provide connections to multiple second tabs 140.

[0054] Figure 7 Another cross-sectional view of another cross-sectional area of ​​the energy storage device is shown. The electrical isolation layer 28 may be large enough to provide electrical isolation between the upper surface of the housing 22 and the current collector 26. The electrical isolation layer 28 may not be limited to any particular form. The electrical isolation layer 28 may include, for example... Figure 7 The folded portion shown provides electrical isolation between housing 22 and current collector 26.

[0055] Figure 8 A cross-sectional view of the energy storage device 20 is shown. In addition to the housing 22, current collector 26, and electrical insulation layer 28 shown in the previous figures, Figure 8 A cover 24 is also shown. Cover 24 can be disposed at the lower part of the energy storage device 20. Although the housing 22, current collector 26, and electrical isolation layer 28 can be disposed on one side accommodating the plurality of second tabs 140, cover 24 can be disposed on the opposite side accommodating the plurality of first tabs 120. Figure 8 As shown, the cover 24 can be directly soldered to a plurality of first tabs 120. By directly soldering to the plurality of first tabs 120, the cover 24 can be electrically connected to the plurality of first tabs 120, thereby forming a first electrical terminal of the energy storage device 20.

[0056] As used herein, the phrase “at least one” in a list referring to one or more entities should be understood to mean at least one entity selected from any one or more entities in that list, but not necessarily including at least one of each and every entity explicitly listed in that list, and does not exclude any combination within that list. This definition also allows for the optional presence of other entities besides those explicitly identified in the list of entities referred to by the phrase “at least one,” regardless of whether these entities are related to or unrelated to those explicitly identified entities. Thus, as a non-restrictive example, in one instance, “at least one of A and B” (or equivalently, “at least one A or B”, or equivalently, “at least one A and / or B”) could mean: an A that does not contain B, optionally including more than one; in another instance, an A that does not contain A, optionally including more than one; and in yet another instance, at least one A, optionally including more than one, and at least one B, optionally including more than one (and optionally including other entities). In other words, the phrases “at least one,” “one or more,” and “and / or” are open expressions that are both logically conjunction and logically disjunctive. For example, each of the expressions “at least one A, B and C”, “at least one A, B or C”, “one or more A, B and C”, “one or more A, B or C” and “A, B and / or C” can refer to a single A, a single B, a single C, A and B together, A and C together, B and C together, A, B and C together, and any of the above, optionally combined with at least one other entity.

[0057] Those skilled in the art, through studying the accompanying drawings, the disclosure, and the appended claims, can understand and implement other variations of the disclosed examples. In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite articles "a" or "an" do not exclude multiple. The mere fact that certain measures are stated in mutually different dependent claims does not imply that combinations of these measures cannot be used advantageously. Reference numerals in the claims should not be construed as limiting the scope of the claims.

[0058] List of reference numerals 1 First page 2. Second page 10 battery cells 12 First conductive substrate More than 120 first electrodes 14 Second conductive substrate More than 140 second pole ears 16 Separator substrate 20 Energy storage devices 22. Shell 24 lids 26 collectors 28 Electrical isolation layers

Claims

1. A battery cell (10) for an energy storage device (20), the battery cell (10) comprising: First conductive substrate (12). Second conductive substrate (14). And a partition substrate (16) disposed between the first conductive substrate (12) and the second conductive substrate (14). In this configuration, the first conductive substrate (12), the second conductive substrate (14), and the separator substrate (16) are arranged in multiple overlapping layers in the form of a battery cell. The first conductive substrate (12) includes a plurality of first tabs (120). The plurality of first tabs (120) include a first outer tab extending from the outer layer of the plurality of overlapping layers and a first inner tab extending from the inner layer of the plurality of overlapping layers, wherein the inner layer is located closer to the center of the cell form than the outer layer. Wherein, the length of the first outer electrode ear is longer than the length of the first inner electrode ear, and The plurality of first tabs (120) are folded toward the center of the cell form, such that adjacent first tabs among the plurality of first tabs (120) are in contact with each other.

2. The battery cell (10) according to claim 1, wherein, The cell form includes a flat geometry comprising two opposite first surfaces (1) and two opposite second surfaces (2) connecting the first surfaces (1) to each other, the first surfaces (1) being substantially planar and the second surfaces (2) being substantially curved.

3. The battery cell (10) according to claim 1 or 2, wherein, Each of the plurality of first electrodes (120) contacts only one or two directly adjacent first electrodes among the plurality of first electrodes (120).

4. The battery cell (10) according to any one of the preceding claims, wherein, The lengths of the plurality of first tabs (120) gradually decrease in the direction toward the center of the cell form.

5. The battery cell (10) according to any one of the preceding claims, wherein, The second conductive substrate (14) includes a plurality of second tabs (140) arranged on the opposite side of the plurality of first tabs (120). Each of the plurality of second tabs (140) includes a second outer tab extending from the outer layer of the plurality of overlapping layers and a second inner tab extending from the inner layer of the plurality of overlapping layers. Wherein, the length of the second outer pole ear is longer than the length of the second inner pole ear, and The plurality of second tabs (140) are folded toward the center of the cell form, such that adjacent second tabs among the plurality of second tabs (140) are in contact with each other.

6. A method for manufacturing a battery cell (10) according to any one of the preceding claims, the method comprising: A foil of a first conductive material, a second conductive substrate (14), and the separating substrate (16) are provided. The foil is laser-processed to cut the first conductive substrate (12) including the plurality of first tabs (120) from the first conductive material. The first conductive substrate (12), the second conductive substrate (14), and the separating substrate (16) are stacked to form the plurality of overlapping layers. The first conductive substrate (12), the second conductive substrate (14) and the separator substrate (16) are arranged to form the cell form; as well as The plurality of first tabs (120) are folded toward the center of the cell form such that adjacent first tabs (120) are in contact with each other.

7. An energy storage device (20), comprising: The battery cell (10) according to any one of claims 1 to 5, and The housing (22) has a generally prismatic shape, wherein the housing (22) at least partially houses the battery cell (10), and wherein the housing (22) includes opposite ends forming electrical terminals of the energy storage device (20).

8. The energy storage device (20) according to claim 7 further includes a cover (24). in, The cover (24) includes a conductive material. Furthermore, the cover (24) is welded to a plurality of first tabs (120) of the first conductive substrate (12) of the cell (10), thereby forming a first electrical terminal in the electrical terminals at one of the opposite ends of the energy storage device (20).

9. The energy storage device (20) according to claim 8, wherein, The cover (24) is disposed at the lower end of the opposite end of the housing (22), and wherein the cover (24) and the housing (22) enclose the cell (10).

10. The energy storage device (20) according to claim 8, wherein, The housing (22) includes a conductive material forming the first electrical terminal.

11. The energy storage device (20) according to any one of claims 7-10, further comprising a current collector (26) located below the upper end of the opposite end of the housing (22), wherein, The current collector (26) is substantially flat and is disposed on and in contact with the second conductive substrate (14) of the cell (10).

12. The energy storage device (20) according to claim 11 further includes an electrical isolation layer (28) disposed between the collector (26) and the upper end of the housing (22).

13. The energy storage device (20) according to claim 12, wherein, Each of the housing (22) and the electrical isolation layer (28) includes a hole that is aligned with each other to form a second electrical terminal of the electrical terminal, which is connected to the current collector (26) at the upper end of the housing (22).

14. The energy storage device (20) according to any one of claims 7 to 13, wherein, The housing (22) comprises nickel steel and / or the first conductive substrate (12) comprises copper.

15. A vehicle comprising an energy storage device (20) according to any one of claims 7-14.

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