Battery cell, and battery pack and vehicle including same

Abstract

A battery cell according to an aspect of the present disclosure includes a battery case, an electrode assembly accommodated in the battery case, and an insulator interposed between the electrode assembly and one bottom surface of the battery case, the insulator having a shape in which the area in contact with the electrode assembly and the bottom surface of the battery case is smaller than the area in contact with the electrode assembly. (Representative Drawing: Fig. 3)

Description

Battery cells, battery packs including the same, and automobiles

[0001] The present invention relates to a battery cell, a battery pack including the same, and an automobile.

[0002] Unlike primary batteries, which cannot be recharged, secondary batteries refer to batteries that can be charged and discharged, and are applied not only to portable devices but also to electric vehicles (EVs) and hybrid electric vehicles (HEVs) driven by electric power sources.

[0003] These secondary batteries are attracting attention as a new energy source for improving eco-friendliness and energy efficiency, as they not only have the primary advantage of being able to drastically reduce the use of fossil fuels but also the advantage of not generating any by-products from the use of energy.

[0004] Currently, widely used types of secondary batteries include lithium-ion batteries, lithium-polymer batteries, nickel-cadmium batteries, nickel-hydrogen batteries, and nickel-zinc batteries. The operating voltage of these unit secondary battery cells, or unit battery cells, is approximately 2.5V to 4.5V. Therefore, if a higher output voltage is required, multiple battery cells are connected in series to form a battery pack. Additionally, depending on the charge / discharge capacity required for the battery pack, multiple battery cells are connected in parallel to form a battery pack. Accordingly, the number of battery cells included in the battery pack and the electrical connection type can be set in various ways depending on the required output voltage or charge / discharge capacity.

[0005] Meanwhile, cylindrical, prismatic, and pouch-type battery cells are known as types of unit secondary battery cells. In the case of a cylindrical battery cell, a separator acting as an insulator is interposed between the positive and negative electrodes, and this is wound to form a jellyroll-shaped electrode assembly, which is then inserted into a cylindrical battery case to constitute the battery. Furthermore, a current collector may be connected to the uninsulated portions of the positive and negative electrodes, and the current collector electrically connects the electrode assembly with the electrode terminals exposed to the outside. Additionally, an electrolyte that enables the movement of lithium ions is injected into the interior of the battery case. A battery cap is attached to one side of the battery case to prevent leakage of the electrolyte and to prevent the electrode assembly from detaching. At this time, a sealing gasket is interposed between the battery case and the battery cap to maintain electrical insulation between them, as well as to prevent leakage of the electrolyte and the penetration of moisture.

[0006] However, if the electrolyte remains stagnant on the bottom surface of the cylindrical battery case for an extended period, it can corrode the battery case. Furthermore, if the battery case corrodes, nickel precipitates, damaging the separator of the electrode assembly; if the separator is damaged, micro-short circuits can occur, causing a voltage drop in the battery cell.

[0007] Accordingly, the present invention provides a battery cell capable of inhibiting corrosion of the battery case by improving the fluidity of the electrolyte.

[0008] In addition, the present invention provides a battery pack including the aforementioned battery cell and an automobile.

[0009] However, the technical problems that the present invention aims to solve are not limited to those described above, and other unmentioned problems will be clearly understood by a person skilled in the art from the description of the invention below.

[0010] A battery cell according to an embodiment of the present invention for solving the above-mentioned problem comprises a battery case, an electrode assembly accommodated in the battery case, and an insulator interposed between the electrode assembly and one bottom surface of the battery case, the insulator being formed in a shape such that the area in contact with one bottom surface of the battery case is smaller than the area in contact with the electrode assembly.

[0011] The above battery case can be made of a material containing nickel.

[0012] Additionally, the insulator may include a flat plate portion that contacts the electrode assembly and a protrusion portion that extends and protrudes from the flat plate portion in the direction of one side bottom surface of the battery case and contacts one side bottom surface of the case.

[0013] In addition, the battery case includes a hollow cylindrical shape, and the flat plate portion of the insulator may include a disc shape.

[0014] In addition, the flat plate portion of the insulator may have a through hole formed in the center.

[0015] In addition, the above-described battery cell may further include an electrode terminal installed on one side of the bottom surface of the battery case and electrically connected to the electrode assembly.

[0016] And the electrode terminal can be electrically connected to the electrode assembly by passing through the through hole formed in the insulator.

[0017] The protrusion of the above-mentioned insulator may be formed in an annular shape.

[0018] A battery cell characterized in that the annular shape of the protrusion and the disc shape of the flat plate have the same center.

[0019] Additionally, the protrusion of the insulator may include a first annular protrusion formed along the edge of the flat plate and a second annular protrusion formed along the edge of a through hole formed in the center of the flat plate.

[0020] In addition, at least one of the first annular protrusion and the second annular protrusion may be in a discontinuous form with at least one region broken.

[0021] In addition, the protrusion of the insulator may include a plurality of pillars.

[0022] Meanwhile, the present invention provides a battery pack comprising at least one battery cell according to the above-described embodiment as a battery pack.

[0023] In addition, the present invention provides a vehicle comprising at least one battery pack according to the above-described embodiment.

[0024] According to the present invention, corrosion of the battery case can be suppressed by improving the fluidity of the electrolyte.

[0025] However, the effects obtainable through the present invention are not limited to those described above, and other unmentioned technical effects will be clearly understood by a person skilled in the art from the description of the invention below.

[0026] FIG. 1 is a perspective view for illustrating a battery cell according to one embodiment of the present invention.

[0027] Figure 2 is a cross-sectional perspective view of the battery cell of Figure 1.

[0028] Figure 3 is a cross-sectional view of the battery cell of Figure 1.

[0029] FIG. 4 is an enlarged rear perspective view of the insulator used in the battery cell of FIG. 1.

[0030] FIG. 5 is an enlarged rear perspective view of an insulator used in a battery cell according to another embodiment of the present invention.

[0031] FIG. 6 is an enlarged rear perspective view of an insulator used in a battery cell according to another embodiment of the present invention.

[0032] FIG. 7 is a drawing for explaining a battery pack including the battery cell of FIG. 1.

[0033] FIG. 8 is a drawing for explaining a vehicle including the battery pack of FIG. 6.

[0034] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Accordingly, in some embodiments, well-known process steps, well-known device structures, and well-known techniques are not specifically described to avoid the present invention being interpreted ambiguously. Throughout the specification, like reference numerals refer to like components.

[0035] In the drawings, thicknesses have been enlarged to clearly represent various layers and regions. Throughout the specification, the same reference numerals have been used for similar parts. When a part such as a layer, film, region, or plate is described as being "above" another part, this includes not only cases where it is "immediately above" another part, but also cases where there is another part in between. Conversely, when a part is described as being "immediately above" another part, it means that there is no other part in between. Furthermore, when a part such as a layer, film, region, or plate is described as being "below" another part, this includes not only cases where it is "immediately below" another part, but also cases where there is another part in between. Conversely, when a part is described as being "immediately below" another part, it means that there is no other part in between.

[0036] Throughout the specification, unless specifically stated otherwise, each component may be singular or plural.

[0037]

[0038] FIGS. 1 to 3 are drawings for explaining a battery cell (101) according to an embodiment of the present invention. FIG. 1 is a perspective view of the battery cell (101), FIG. 2 is a cross-sectional perspective view of the battery cell (101), and FIG. 3 is a cross-sectional view of the battery cell (101).

[0039] Referring to FIGS. 1 to 3, a battery cell (101) according to one embodiment of the present invention includes a battery case (400), an electrode assembly (110), and an insulator (501).

[0040] Additionally, the battery cell (101) may further include one or more of a cap plate (450), a sealing gasket (240), a current collector plate (220, 320), an electrode terminal (330), and a terminal gasket (340).

[0041] The electrode assembly (110) includes a first electrode having a first polarity, a second electrode having a second polarity, and a separator interposed between the first electrode and the second electrode. For example, the first electrode may be a positive or negative electrode, and the second electrode may correspond to an electrode having a polarity opposite to that of the first electrode.

[0042] The electrode assembly (110) may have a structure in which a first electrode and a second electrode and a separator interposed between them are wound in one direction. The electrode assembly (110) may have, for example, a jelly roll structure. That is, the electrode assembly (110) may be manufactured by winding a laminate formed by stacking a first electrode current collector and a second electrode current collector having a sheet shape at least once with a separator interposed between them in one direction with respect to the center of the winding. However, an embodiment of the present invention is not limited to the foregoing, and any jelly roll structure known to those skilled in the art may be applied without limitation to the present invention.

[0043] The first electrode comprises a first electrode current collector and a first electrode active material applied on one or both sides of the first electrode current collector. A first uncoated portion (111) where the first electrode active material is not applied exists at one end in the width direction of the first electrode current collector. The first uncoated portion (111) can function as a first electrode tab. The first uncoated portion (111) is provided on the upper side in the height direction of an electrode assembly (110) housed within a battery case (400). That is, the first electrode current collector includes a first uncoated portion (111) that is not coated with an active material layer at the long end and is exposed to the outside of the separator, and a part of the first uncoated portion (111) is used as an electrode tab itself. For example, in this specification, the first electrode may be a negative electrode, and the first uncoated portion (111) may be a negative electrode tab.

[0044] The second electrode comprises a second electrode current collector and a second electrode active material applied on one or both sides of the second electrode current collector. At the other end in the width direction of the second electrode current collector, there is a second uncoated portion (112) where the second electrode active material is not applied. The second uncoated portion (112) can function as a second electrode tab. The second uncoated portion (112) is provided at the lower height direction of the electrode assembly (110) housed within the battery case (400). That is, the second electrode current collector includes a second uncoated portion (112) that is not coated with an active material layer at the long end and is exposed to the outside of the separator, and at least a portion of the second uncoated portion (112) is used as an electrode tab itself. For example, in this specification, the second electrode may be a positive electrode and the second uncoated portion (112) may be a positive electrode tab.

[0045] Meanwhile, the first non-removable portion (111) provided at the upper height direction of the electrode assembly (110) housed in the battery case (400) and the second non-removable portion (112) provided at the lower height direction of the electrode assembly (110) are exemplary forms. Accordingly, the first non-removable portion (111) may be provided at the lower height direction of the electrode assembly (110), and the second non-removable portion (112) may be provided at the upper height direction of the electrode assembly (110) housed in the battery case (400).

[0046] In this way, the first non-removable portion (111) and the second non-removable portion (112) may extend in opposite directions along the height direction of the cylindrical battery cell (101). In the present invention, the positive active material coated on the positive plate and the negative active material coated on the negative plate may be used without limitation as long as they are active materials known to those skilled in the art.

[0047] An opening may be formed on the upper side of the battery case (400). That is, the opening may be provided on the upper side of the battery cell (101). The battery case (400) accommodates the electrode assembly (110) through the opening formed on the upper side, and also accommodates the electrolyte.

[0048] Meanwhile, an electrode terminal (330), which will be described later, may be provided on the lower surface located opposite the opening of the battery case (400). For example, in this specification, the electrode terminal (330) may be electrically connected to the second non-positive portion (112) of the second electrode. That is, the electrode terminal (330) may be a positive terminal.

[0049] Specifically, the battery case (400) includes a circular bottom portion (411), a side portion (412) extending from the bottom portion (411), and a crimping portion (430) formed by bending the end of the side portion (412). That is, the battery case (400) may include a hollow cylindrical shape.

[0050] Additionally, the battery case may further include a beading portion (420) formed by pressing the side portion (412) adjacent to the crimping portion (430) inward.

[0051] The crimping portion (430) can be folded and extended inward toward the battery case (400) to wrap around and secure the edge of the cap plate (450) together with the sealing gasket (240) described later.

[0052] Specifically, the crimping portion (430) may be formed in the upper region of the battery case (400). The crimping portion (430) may have a shape that is bent and extended inward along the radial direction of the cylindrical battery cell (101) from the upper perimeter of the battery case (400). The crimping portion (430) is provided in a region corresponding to the perimeter of the edge of the cap plate (450) to be described later, thereby fixing the cap plate (450) and preventing the cap plate (450) from moving upward.

[0053] Additionally, when a beading portion (420) is provided in the battery case (400), a crimping portion (430) is formed on the upper part of the beading portion (420). The crimping portion (430) extends from the beading portion (420) and has a shape that is bent and extended to wrap around the outer surface of the cap plate (450) placed on the beading portion (420) and a part of the upper surface of the cap plate (450). The upper end of the crimping portion (430) may have a shape that extends inward by a predetermined distance along the radial direction of the cylindrical battery cell (101) to wrap around a part of the upper surface of the cap plate (450). By doing so, the crimping portion (430) secures the perimeter of the upper surface of the cap plate (450). That is, the perimeter area of ​​the cap plate (450) is interposed between the top of the crimping portion (430) and the beading portion (420) and is fixed to the battery case (400), covering the opening of the battery case (400).

[0054] Additionally, the crimping portion (430) may be formed to wrap around a part of the first current collector plate (220), which will be described later, along with the edge of the cap plate (450). At this time, the end of the crimping portion (430) of the battery case (400) may be bent to penetrate the sealing gasket (240) that wraps around the edge of the cap plate (450).

[0055] The beading portion (420) can be formed by pressing the outer circumference of the battery case (400) inward. That is, the beading portion (420) has a shape that is inserted to a predetermined depth along the radial direction from the outer circumference of the battery case (400) and extends along the circumferential direction of the battery case (400). The beading portion (420) prevents the electrode assembly (110), which has a size corresponding to the width of the battery case (400), from coming out through the upper opening of the battery case (400), and can function as a support portion on which the cap plate (450) is seated.

[0056] Additionally, the battery case (400) may be made of a material containing nickel. For example, the battery case (400) may be made of nickel-plated steel.

[0057] The cap plate (450) has its edge wrapped around the crimping portion (430) of the battery case (400) to cover the open end of the battery case (400).

[0058] In other words, the cap plate (450) forms a side opposite to one side of the battery cell (101), that is, the bottom portion (411) of the battery case (400). Thus, one side of the bottom surface of the battery case (400) becomes the bottom portion (411), and the other side of the bottom surface of the battery case (400) is covered by the cap plate (450).

[0059] For example, the cap plate (450) is non-polar and may be made of a metal material to ensure rigidity. That is, even if the cap plate (450) is made of a conductive metal material, it may not have polarity. In other words, the cap plate (450) can be electrically insulated from the battery case (400) which functions as a negative terminal and the electrode terminal (330) which functions as a positive terminal, as described later. Therefore, the cap plate (450) does not need to be electrically connected to the electrode assembly (110) and the battery case (400), and its material does not necessarily have to be a conductive metal.

[0060] Meanwhile, in one embodiment of the present invention, the vertical direction of the battery cell (101) can be changed as much as possible depending on the form in which the battery cell (101) is accommodated in the battery pack (10) to be described later. That is, in FIGS. 1 to 3, the electrode terminal (330) is positioned so that it faces downward and the cap plate (450) faces upward, but the arrangement of the battery cell (101) is not necessarily limited to this, and the electrode terminal (330) may be positioned so that it faces upward and the cap plate (450) faces downward. Accordingly, the first non-retaining portion (111) described above may be located at the lower height direction of the electrode assembly (110) accommodated in the battery case (400), or the second non-retaining portion (111) may be located at the lower height direction of the electrode assembly (110) accommodated in the battery case (400).

[0061] The sealing gasket (240) wraps around the crimping portion (430) of the battery case (400) together with the edge of the cap plate (450) to seal the battery case (400). At this time, the sealing gasket (240) may be folded together along the folded shape of the crimping portion (430) of the battery case (400). If the battery case (400) is provided with a beading portion (420), the sealing gasket (240) may be interposed between the upper surface of the beading portion (420) and the upper end of the crimping portion (430).

[0062] Accordingly, the sealing gasket (240) is provided between the cap plate (450) and the crimping portion (430) of the battery case (400) to seal the open top of the battery case (400) and to electrically insulate the battery case (400) from the cap plate (450). Accordingly, the sealing gasket (240) may include a material having insulating and elastic properties, and may include a polymer resin.

[0063] For example, the sealing gasket (240) may include one or more heat-resistant resins selected from the group comprising polypropylene (PP), polyethylene (PE), polyimide (PI), polycarbonate (PC), polybutylene terephthalate (PBT), or polystyrene (PS).

[0064] Additionally, the battery case (400) may be electrically connected to the first non-electrode portion (111) of the electrode assembly (110). In this case, the battery case (400) may have the same polarity as the first non-electrode portion (111). For example, the battery case (400) may function as a negative terminal. On the other hand, the battery case (400) must be insulated from the second non-electrode portion (112) of the electrode assembly (200).

[0065] The electrode terminal (330) may have a riveting structure. Specifically, the electrode terminal (330) may be riveted through a through hole formed in the bottom portion (411) of the battery case (400). And a terminal gasket (340) may be provided between the electrode terminal (330) and the outer diameter of the through hole.

[0066] The electrode terminal (330) can be electrically connected to the second non-electrode portion (112) of the electrode assembly (110). In this case, the electrode terminal (330) may have the same polarity as the second non-electrode portion (112). For example, the electrode terminal (330) may function as a positive terminal.

[0067] The current collector plate (220, 320) may include a first current collector plate (220) that electrically connects the first non-removable portion (111) of the electrode assembly (110) to the battery case (400), and a second current collector plate (320) that electrically connects the second non-removable portion (112) of the electrode assembly (110) to the electrode terminal (330).

[0068] Specifically, the first current collector plate (220) can be interposed between the sealing gasket (240) and the beading portion (420) at one end and in contact with the beading portion (420), and the other end can be in contact with the first non-removable portion (111) of the electrode assembly (110). At this time, one end of the first current collector plate (220) can be fixed by being pressed together with the edge of the cap plate (450) when the end of the crimping portion (430) of the battery case (400) is bent so that it penetrates the sealing gasket (240).

[0069] An insulator (501) is interposed between the electrode assembly (110) and one side bottom surface of the battery case (400). For example, one side bottom surface of the battery case (400) may be a bottom portion (411). The insulator (501) is formed in a shape such that the area in contact with one side bottom surface of the battery case (400) is smaller than the area in contact with the electrode assembly (110).

[0070] Specifically, the insulator (501) electrically insulates the second electrode of the electrode assembly (110) from the battery case (400). More specifically, the insulator (501) is interposed between the second current collector plate (320) connected to the second electrode of the electrode assembly (110) and the bottom portion (411) of the battery case (400) to prevent the second current collector plate (320) from being electrically connected to the bottom portion (411) of the battery case (400).

[0071] The insulator (501) may be made of various materials known to those skilled in the art to which the present invention belongs. For example, the insulator (501) may include silicon.

[0072]

[0073] FIG. 4 is an enlarged rear perspective view of an insulator (501) used in a battery cell (101) according to one embodiment of the present invention.

[0074] Referring to FIG. 4, the insulator (501) may include a flat plate (510) in contact with the electrode assembly (110) and a protrusion (550) that extends and protrudes from the flat plate (510) toward one side bottom surface of the battery case (400) and contacts one side bottom surface of the battery case (400).

[0075] Additionally, as described above, the battery case (400) may include a hollow cylindrical shape. The flat plate portion (510) of the insulator (501) may include a disc shape corresponding to the bottom portion (411) of the battery case (400). And a through hole (511) may be formed in the center of the flat plate portion (510) of the insulator (501). As described above, an electrode terminal (330) may be installed on one side bottom surface of the battery case (400) and electrically connected to the electrode assembly (110). In this case, the electrode terminal (330) may pass through the through hole (511) formed in the insulator (501) and be electrically connected to the electrode assembly (110).

[0076] Additionally, the protrusion (550) of the insulator (501) may be formed in an annular shape. For example, the protrusion (550) of the insulator (501) may include a first annular protrusion (551) formed along the edge of the flat plate (510) and a second annular protrusion (552) formed along the edge of the through hole (511) formed in the center of the flat plate (510).

[0077] In addition, the annular shape of the protrusion (550) and the disc shape of the flat plate (510) may have the same center.

[0078] With this structure, the insulator (501) can secure structural rigidity while minimizing the surface contacting one side of the battery case (400).

[0079] The electrolyte is prone to accumulating on the contact surface between the insulator (501) and the battery case (400) even if the up and down direction of the battery cell (101) is reversed. If the electrolyte remains on the contact surface between the insulator (501) and the battery case (400) for a long time, the electrolyte will corrode the battery case (400). When the battery case (400) corrodes, nickel is precipitated from the battery case (400), damaging the separator of the electrode assembly (110). If the separator is damaged, a micro-short circuit may occur, causing a voltage drop in the battery cell (101).

[0080] However, according to one embodiment of the present invention, the contact area between the insulator (501) and one side bottom surface of the battery case (400) is minimized, so the phenomenon of electrolyte accumulating on the contact surface between the insulator (501) and the battery case (400) can be minimized, and corrosion of the battery case (400) caused by this can be suppressed.

[0081] Meanwhile, the present invention is not limited to the structure of the battery cell (101) as described above, and can also be applied to a battery cell (101) having a structure different from that described above, provided that an insulator (501) for insulating either the positive or negative electrode of the electrode assembly (110) and the current collector plate (220, 320) connected thereto from the battery case (400) is interposed between the electrode assembly (110) or the current collector plate (220, 320) and one side bottom surface of the battery case (400).

[0082] According to one embodiment of the present invention, by such a configuration, the fluidity of the electrolyte can be improved to suppress corrosion of the battery case (400).

[0083]

[0084] Hereinafter, with reference to FIG. 5, an insulator (502) used in another embodiment of the present invention will be described.

[0085] In another embodiment of the present invention, at least one of the first annular protrusion (553) and the second annular protrusion (554) of the insulator (502) may be in a discontinuous form with at least one region broken.

[0086] Accordingly, the area where the protrusion (550) contacts one side bottom surface of the battery case can be further reduced, and the fluidity of the electrolyte can be further improved as the electrolyte can move through one or more of the broken spaces of the first annular protrusion (553) and the second annular protrusion (554).

[0087] According to another embodiment of the present invention, by such a configuration, the fluidity of the electrolyte can be further improved to suppress corrosion of the battery case (400). In this way, if the fluidity of the electrolyte inside the battery cell increases, the overall resistance can be reduced.

[0088]

[0089] Hereinafter, with reference to FIG. 6, an insulator (503) used in another embodiment of the present invention will be described.

[0090] In another embodiment of the present invention, the insulator (503) may have a protrusion (555) that includes a plurality of pillars.

[0091] Accordingly, the area where the protrusion (550) contacts one side of the battery case can be reduced, and the fluidity of the electrolyte can be improved while the strength of the insulator can also be secured.

[0092] According to another embodiment of the present invention, by such a configuration, the fluidity of the electrolyte can be further improved to suppress corrosion of the battery case (400). In this way, if the fluidity of the electrolyte inside the battery cell increases, the overall resistance can be reduced.

[0093]

[0094] FIG. 7 is a drawing for explaining a battery pack (10) including the battery cell (101) of FIG. 1.

[0095] Referring to FIG. 7, the battery pack (10) according to the present invention may include at least one battery cell (101) according to the present invention as described above. Additionally, the battery pack (10) according to the present invention may include a pack case (20) capable of accommodating the at least one battery cell (101). Furthermore, in addition to the battery cell (101), various other components, such as a battery management system (BMS), a battery disconnect unit (BDU), a relay, a current sensor, etc., may be further included.

[0096]

[0097] FIG. 8 is a drawing for explaining a vehicle (1) including the battery pack (10) of FIG. 7.

[0098] Referring to FIG. 8, the automobile (1) according to the present invention may include at least one battery pack (10) according to the present invention.

[0099] The battery pack (10) according to the present invention may be applied to a vehicle (1), such as an electric vehicle or a hybrid vehicle. That is, the vehicle (1) according to the present invention may include the battery pack (10) according to the present invention. In addition, the vehicle (1) according to the present invention may include various other components included in the vehicle in addition to the battery pack (10). For example, the vehicle (1) according to the present invention may include, in addition to the battery pack (10) according to the present invention, a vehicle body, a motor, a control device such as an electronic control unit (ECU), etc.

[0100]

[0101] Although operations are depicted in a specific order in the drawings, it should not be understood that the operations must be executed in the specific order depicted or in a sequential order, or that all depicted operations must be executed to obtain the desired result. In certain situations, multitasking and parallel processing may be advantageous. Furthermore, the separation of the various configurations in the embodiments described above should not be understood as a necessary separation, and it should be understood that the described program components and systems can generally be integrated together into a single software product or packaged into multiple software products.

[0102] The above description is merely an illustrative explanation of the technical concept of the present embodiment, and a person skilled in the art to which the present embodiment belongs would be able to make various modifications and variations within the scope of the essential characteristics of the present embodiment. Accordingly, the present embodiments are intended to explain, not limit, the technical concept of the present embodiment, and the scope of the technical concept of the present embodiment is not limited by these embodiments. The scope of protection of the present embodiment shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present embodiment.

[0103] < Explanation of Symbols >

[0104] 1: Car

[0105] 10: Battery pack

[0106] 20: Pack case

[0107] 101: Battery cell

[0108] 110: Electrode assembly

[0109] 111: 1st Department of Indefinite Expenses

[0110] 112: 2nd Department of Indefinite Service

[0111] 220: First tribunal

[0112] 240: Sealing gasket

[0113] 320: Second tribunal

[0114] 330: Electrode terminal

[0115] 340: Terminal gasket

[0116] 400: Battery Case

[0117] 411: Bottom

[0118] 412: Side

[0119] 420: Bidding Department

[0120] 430: Creaming Department

[0121] 450: Cap Plate

[0122] 501, 502, 503: Insulator

[0123] 510: Reputation Department

[0124] 511: Penetrating hole

[0125] 550, 555: Protrusion

[0126] 551, 553: First annular projection

[0127] 552, 554: Second annular projection

[0128] The present invention can be used to provide a battery cell that inhibits corrosion of the battery case by improving the fluidity of the electrolyte.

Claims

1. Battery case; An electrode assembly accommodated in the battery case above; and An insulator interposed between the electrode assembly and one bottom surface of the battery case, formed in a shape such that the area in contact with one bottom surface of the battery case is smaller than the area in contact with the electrode assembly. A battery cell containing 2. In Paragraph 1, A battery cell characterized in that the above-mentioned battery case is made of a material containing nickel.

3. In Paragraph 1, The above insulator is, A flat plate portion in contact with the above electrode assembly; A protrusion extending from the flat plate portion in the direction of one side bottom surface of the battery case and contacting one side bottom surface of the case A battery cell characterized by including 4. In Paragraph 3, The above battery case includes a hollow cylindrical shape, and A battery cell characterized in that the flat plate portion of the above-mentioned insulator includes a disc shape.

5. In Paragraph 4, A battery cell characterized in that the flat plate portion of the above-mentioned insulator has a through hole formed in the center.

6. In Paragraph 5, A battery cell characterized by further including an electrode terminal installed on one side bottom surface of the battery case and electrically connected to the electrode assembly.

7. In Paragraph 6, A battery cell characterized in that the electrode terminal passes through the through hole formed in the insulator and is electrically connected to the electrode assembly.

8. In Paragraph 4, A battery cell characterized in that the protrusion of the above-mentioned insulator is formed in an annular shape.

9. In Paragraph 8, A battery cell characterized in that the annular shape of the protrusion and the disc shape of the flat plate have the same center.

10. In Paragraph 5, The protrusion of the above-mentioned insulator comprises a first annular protrusion formed along the edge of the flat plate; A second annular protrusion formed along the edge of a through hole formed in the center of the flat plate portion. A battery cell characterized by including 11. In Paragraph 10, A battery cell characterized in that at least one of the first annular protrusion and the second annular protrusion is in a discontinuous form with at least one region broken.

12. In Paragraph 3, A battery cell characterized in that the protrusion of the above-mentioned insulator includes a plurality of pillars.

13. A battery pack characterized by including at least one battery cell described in any one of claims 1 to 12.

14. An automobile characterized by including at least one battery pack as described in paragraph 13.