Battery cell, and battery pack and vehicle comprising same

Abstract

The battery cell according to an embodiment of the present invention comprises: an electrode assembly: a housing which accommodates the electrode assembly through an opening part provided on one side of the housing and has a closing part formed on the opposite side of the opening part; a current collector disposed between the electrode assembly and the closing part and electrically coupled to the electrode assembly; a terminal electrically coupled to the electrode assembly through the closing part; and a CID interposed between the terminal and the current collector and coupled to the current collector with a greater coupling force than the terminal.

Description

Battery cells, and battery packs and vehicles containing them

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

[0002] This application claims priority to Korean Patent Application No. 10-2023-0077099, filed on June 15, 2023, and all contents disclosed in the specification and drawings of the said application are incorporated by reference into this application.

[0003] Current fuse devices used in secondary batteries include PTC thermistors (positive temperature coefficient thermistors) and TCOs (thermal cut-outs). However, PTC and TCOs have a drawback: their inherent resistance increases with repeated operation, increasing the overall resistance of the circuit.

[0004] In addition, all of the above-mentioned devices are operated by heat generation due to overcurrent. In other words, the above-mentioned devices are devices that operate to block the flow of current only when overcurrent is generated in the circuit current path due to overcharging, etc., and this causes the temperature to rise.

[0005] Therefore, in the case of the above-mentioned devices, they can only operate and block overcurrent after overheating has already created a safety hazard, and cannot immediately block overcurrent when a cause that could cause a temperature increase occurs. Even if the internal pressure increases due to an abnormal rise in temperature within the secondary battery, if the overcurrent blocking is not performed at an appropriate time, safety issues such as fire or explosion may occur.

[0006] In addition, since the above-mentioned devices operate simply based on temperature, they are difficult to use in secondary batteries that exhibit high output, such as battery packs used in automobiles. That is, in the case of automobile battery packs, a high c-rate is required, and accordingly, the amount of heat generated is bound to be high. However, devices such as PTC thermistors (positive temperature coefficient thermistors), TCOs (thermal cut-outs), and thermal fuses have the problem of operating too early when placed in such high-temperature environments.

[0007] Therefore, a secondary battery is needed that can be used in an environment where high current flows, and that has a structure that can cut off the current in advance when an event that could cause the temperature to rise (e.g., an increase in the internal pressure of the secondary battery) occurs before the temperature rises to a level that could cause a safety issue.

[0008] The present invention was created in consideration of the above-described problems, and its primary purpose is to provide a battery cell having a structure that can quickly cut off current when an abnormality occurs in the battery cell, and a battery pack and a vehicle including the same.

[0009] However, the technical problems to be solved by the present invention are not limited to the problems described above, and other problems not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0010] According to one embodiment of the present invention for solving the above-described problem, a battery cell comprises: an electrode assembly; a housing having an opening provided on one side for accommodating the electrode assembly and a closing portion formed on an opposite side of the opening portion; a current collector disposed between the electrode assembly and the closing portion and electrically coupled to the electrode assembly; a terminal electrically coupled to the electrode assembly through the closing portion; and a CID interposed between the terminal and the current collector and coupled to the current collector with a greater bonding force than the terminal.

[0011] The area of ​​the bonding surface between the CID and the current collector may be wider than the area of ​​the bonding surface between the CID and the terminal.

[0012] The bonding surface formed at the lower end of the above terminal may be provided at a position corresponding to the winding center hole of the above electrode assembly.

[0013] The above CID can be coupled to the collector on the inner and outer sides of the area corresponding to the winding center hole.

[0014] The above-mentioned current collector may include a first coupling portion electrically coupled to the electrode assembly; and a second coupling portion positioned spaced apart from the first coupling portion along the radial direction of the electrode assembly and provided at a position corresponding to a winding center hole of the electrode assembly.

[0015] The above CID can be coupled to both the first coupling portion and the second coupling portion.

[0016] The CID may be configured to cover both the first coupling portion and the second coupling portion along the radial direction of the electrode assembly.

[0017] The battery cell may include a CID gasket interposed between the closure and the current collector, and maintaining the separation state when a separation occurs between the closure and the current collector due to an increase in pressure inside the housing.

[0018] The above CID gasket may be configured to have elastic restoring force in the direction of expansion between the closing portion and the collector.

[0019] The above CID gasket may be configured to expand as the temperature inside the housing increases.

[0020] The CID gasket may be interposed, at least in part, between the CID and the closure.

[0021] The above battery cell may include a battery cap configured to cover the opening.

[0022] The above battery cap may have a venting portion configured to be more vulnerable compared to the surroundings.

[0023] The joint between the terminal and the CID may be configured to break at a pressure lower than the venting pressure of the venting portion.

[0024] A battery pack according to one embodiment of the present invention for solving the above-described problem includes a battery cell of the present invention.

[0025] According to one embodiment of the present invention for solving the above-described problem, a vehicle includes a battery pack of the present invention.

[0026] According to one aspect of the present invention, when an abnormality occurs in a battery cell, current can be quickly cut off, thereby ensuring safety in the use of a secondary battery.

[0027] According to another aspect of the present invention, it is possible to prevent a phenomenon in which electrical connection is re-established after current interruption is achieved due to an abnormality in a battery cell.

[0028] According to another aspect of the present invention, the current can be cut off in advance before venting of the battery cell occurs, thereby further improving the safety of using the secondary battery.

[0029] However, the advantageous effects derived from the present invention are not limited to the above-described effects, and other advantageous effects not mentioned will be clearly understood by those skilled in the art from the description of the invention described below.

[0030] The following drawings attached to this specification illustrate preferred embodiments of the present invention, and together with the detailed description of the invention described below, serve to further understand the technical idea of ​​the present invention, and therefore, the present invention should not be interpreted as being limited to matters described in such drawings.

[0031] FIG. 1 is a partial cross-sectional view showing the upper portion structure of a battery cell according to one embodiment of the present invention.

[0032] FIG. 2 is a drawing for explaining the breakage of the joint between parts as the internal pressure of the battery cell illustrated in FIG. 1 increases.

[0033] FIG. 3 is a drawing for explaining a phenomenon in which, when the CID of the present invention is omitted in the battery cell illustrated in FIGS. 1 and 2, the joint portion of the terminal and the current collector move together without breaking as the terminal rises.

[0034] FIG. 4 is a drawing for explaining a phenomenon in which the connection portion between a terminal and a CID is broken as the terminal rises when the CID of the present invention is applied to the battery cell illustrated in FIGS. 1 and 2.

[0035] FIG. 5 is a drawing showing a battery cell to which a current collector of a different type from the current collector illustrated in FIG. 1 is applied.

[0036] FIG. 6 is a drawing for explaining the breakage of the joint between parts as the internal pressure of the battery cell illustrated in FIG. 5 increases.

[0037] FIGS. 7 and 8 are drawings showing exemplary forms of current collectors applied to the battery cells illustrated in FIGS. 5 and 6.

[0038] FIG. 9 is a drawing for explaining a phenomenon in which, in the case where the CID of the present invention is omitted in the battery cell illustrated in FIGS. 5 and 6, the joint portion of the terminal and the current collector moves together without being broken as the terminal rises.

[0039] FIG. 10 is a drawing for explaining a phenomenon in which, in the battery cell illustrated in FIGS. 5 and 6, when the CID of the present invention is connected only to the second connecting portion of the current collector, the connecting portion of the terminal and the CID moves together without breaking as the terminal rises.

[0040] FIG. 11 is a drawing for explaining a phenomenon in which the connection portion of the terminal and the CID is broken as the terminal rises when the CID of the present invention is connected to both the first connection portion and the second connection portion of the current collector in the battery cell illustrated in FIGS. 5 and 6.

[0041] FIG. 12 is a drawing showing a battery cell to which a CID gasket is additionally applied in the battery cell illustrated in FIG. 5.

[0042] FIG. 13 is a drawing for explaining the breakage of the joint between parts as the internal pressure of the battery cell illustrated in FIG. 12 increases.

[0043] FIG. 14 and FIG. 15 are drawings showing a battery cell having a structure in which the CID gasket is positioned at a different position compared to the battery cell illustrated in FIG. 12.

[0044] Fig. 16 is a drawing showing the appearance of a battery cell of the present invention.

[0045] Fig. 17 is a drawing showing the overall internal structure of the battery cell illustrated in Fig. 16.

[0046] Fig. 18 is a partial cross-sectional view showing the lower portion structure of the battery cell of the present invention.

[0047] FIG. 19 is a drawing showing a battery pack according to one embodiment of the present invention.

[0048] FIG. 20 is a drawing showing a vehicle according to one embodiment of the present invention.

[0049] 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 interpreted as limited to their typical or dictionary meanings, and should be interpreted with meanings and concepts that conform to the technical spirit of the present invention based on the principle that the inventor can appropriately define the concept of the term to best explain his or her own invention. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are only some of the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as of the time of this application.

[0050]

[0051] Referring to FIGS. 1 to 4, a battery cell (1) according to an embodiment of the present invention will be described. FIG. 1 is a partial cross-sectional view showing the structure of the upper portion of a battery cell according to an embodiment of the present invention, and FIG. 2 is a drawing for explaining the breakage of a joint between components as the internal pressure of the battery cell illustrated in FIG. 1 increases. FIG. 3 is a drawing for explaining a phenomenon in which, in the battery cell illustrated in FIGS. 1 and 2, when the CID of the present invention is omitted, the joint portion of a terminal and a current collector moves together without breakage as the terminal rises, and FIG. 4 is a drawing for explaining a phenomenon in which, in the battery cell illustrated in FIGS. 1 and 2, when the CID of the present invention is applied, the joint portion of a terminal and a CID is broken as the terminal rises.

[0052] First, referring to FIG. 1, a battery cell (1) according to one embodiment of the present invention may include an electrode assembly (10), a housing (20), a current collector (first current collector) (30), a terminal (40), and a CID (current interruption device) (50).

[0053] The electrode assembly (10) may include a first electrode, a second electrode, and a separator interposed between the first electrode and the second electrode. The electrode assembly (10) may be, for example, a jelly roll type electrode assembly in which a laminate including the first electrode, the second electrode, and the separator is rolled in one direction. The electrode assembly (10) may have a first uncoated portion (11) at the top. The first uncoated portion (11) refers to a region of the first electrode where an electrode active material is not coated. The first uncoated portion (11) may be formed at one end of the first electrode and may extend along the rolling direction of the electrode assembly (10). The first uncoated portion (11) may extend upward along the height direction (the direction parallel to the Z-axis) of the electrode assembly (10).

[0054] The housing (20) may be configured to accommodate an electrode assembly (10) through an opening provided on one side. The housing (20) may have a closing portion formed on the opposite side of the opening portion.

[0055] The current collector (30) may be placed between the electrode assembly (10) and the closing portion of the housing (20). The current collector (30) may be electrically coupled to the electrode assembly (10). For example, one side of the current collector (30) may be coupled to the first non-conductive portion (11) provided at the upper end of the electrode assembly (10). The coupling between the current collector (30) and the electrode assembly (10) may be achieved by, for example, laser welding, ultrasonic welding, or the like.

[0056] Meanwhile, the first non-coated portion (11) may have segments formed by being segmented along the winding direction of the electrode assembly (10), and these segments may be bent toward the core of the electrode assembly (10), for example. The bent segments of the first non-coated portion (11) may be overlapped with each other to form a plurality of layers. When the segments of the first non-coated portion (11) are bent in this way, the current collector (30) may be bonded to a substantially flat surface formed by the bending of the first non-coated portion (11).

[0057] The terminal (40) can be electrically coupled to the electrode assembly (10) through the closed portion of the housing (20). The terminal (40) can, for example, penetrate approximately the center of the closed portion of the housing (20). The terminal (40) can be secured, for example, by riveting on the inner surface of the closed portion of the housing (20).

[0058] The CID (50) may be interposed between the terminal (40) and the current collector (30). The CID (50) may be a plate including a conductive metal. The CID (50) may have a first surface that can be coupled to the terminal (40), and a second surface that is opposite the first surface may be coupled to the current collector (30). The CID (50) may be coupled with a stronger bonding force to the current collector (30) than to the terminal (40). That is, the bonding force between the first surface of the CID (50) and the terminal (40) may be formed stronger than the bonding force between the second surface of the CID (50) and the current collector (30).

[0059] Referring to Fig. 2, by differently configuring the bonding force between parts using the CID (50) in this way, the bonding portion between the terminal (40) and the CID (50) can be quickly broken when the housing (20) expands due to an increase in the internal pressure of the battery cell (1), thereby blocking the flow of current through the terminal (40).

[0060] Referring to FIG. 3, in the case of a battery cell (1) to which a CID (50) is not applied, unlike the battery cell (1) of the present invention, when the terminal (40) rises due to an increase in internal pressure, a phenomenon may occur in which the joint portion between the current collector (30) and the electrode assembly (10) is partially broken before the joint portion between the current collector (30) and the terminal (40) is broken, and / or a phenomenon may occur in which the joint portion between the current collector (30) and the terminal (40) is delayed in breaking as the current collector (30) bends.

[0061] The difference in bonding strength as described above may be caused, for example, by a difference in bonding area. For example, the area of ​​the bonding surface between the CID (50) and the current collector (30) may be formed to be wider than the area of ​​the bonding surface between the CID (50) and the terminal (40).

[0062] After welding the CID (50) to the current collector (30) coupled to the electrode assembly (10), the assembly including the electrode assembly (10), the current collector (30) and the CID (50) can be pushed through the opening of the housing (20) so that the CID (50) comes into contact with the bottom surface of the terminal (40). Next, the current collector (30), the CID (50) and the terminal (40) can be welded by inserting a welding device or irradiating a laser through the winding center hole (10a) formed at approximately the center of the electrode assembly (10). At this time, by configuring the welding area between the CID (50) and the terminal (40) to be smaller than the welding area between the current collector (30) and the CID (50), the fracture of the welding area between the terminal (40) and the CID (50) due to an increase in internal pressure can be quickly achieved.

[0063] The bonding surface formed at the lower end of the terminal (40) may be provided at a position corresponding to the winding center hole (10a) of the electrode assembly (10). In this case, the current collector (30) cannot be bonded to the electrode assembly (10) at a position corresponding to the bonding portion of the CID (50) and the terminal (40). Therefore, when the closure portion is bent due to an increase in the internal pressure of the battery cell (1) and the terminal (40) is raised accordingly, the current collector (30) may be bent in the area corresponding to the winding center hole (10a). This bending of the current collector (30) may cause a breakage of the bonding portion between the terminal (40) and the CID (50). When the CID (50) of the present invention is applied, the CID (50) can reinforce the rigidity of the current collector (30), and thereby the breakage of the bonding portion between the terminal (40) and the CID (50) can occur more quickly.

[0064] Referring to FIG. 4 together with FIGS. 1 to 3, the CID (50) can be coupled with the current collector (30) at the inner side (area B) and outer side (area A) of the area corresponding to the winding center hole (10a). In this case, bending of the current collector (30) and the CID (50) can be further suppressed, thereby allowing the breakage of the joint portion of the terminal (40) and the CID (50) to occur more quickly.

[0065] Meanwhile, referring to FIGS. 1 and 2, the battery cell (1) of the present invention may include an insulator (IS) and / or an insulating gasket (G1). The insulator (IS) may be placed in a space formed between the closing portion of the housing (20) and the current collector (30). The insulator (IS) may include an insulating material. The insulator (IS) may prevent contact between the current collector (30) and the housing (20), which are configured to have different polarities. The insulating gasket (G1) may be interposed between the terminal (40) and the housing (20). The insulating gasket (G1) may include an insulating material. The insulating gasket (G1) may prevent contact between the terminal (40) and the housing (20), which are configured to have different polarities.

[0066]

[0067] Next, with reference to FIGS. 5 to 11, a battery cell (1) having a structure different from that described above will be described. FIG. 5 is a drawing showing a battery cell to which a current collector of a different form from that shown in FIG. 1 is applied, and FIG. 6 is a drawing for explaining the breakage of a joint between components as the internal pressure of the battery cell shown in FIG. 5 increases. FIGS. 7 and 8 are drawings showing exemplary forms of current collectors applied to the battery cells shown in FIGS. 5 and 6. FIG. 9 is a drawing for explaining a phenomenon in which, in the battery cell shown in FIGS. 5 and 6, when the CID of the present invention is omitted, the joint portion of a terminal and a current collector moves together without being broken as the terminal rises. FIG. 10 is a drawing for explaining a phenomenon in which, in the battery cell shown in FIGS. 5 and 6, when the CID of the present invention is connected only to the second joint portion of the current collector, the joint portion of a terminal and a CID moves together without being broken as the terminal rises. FIG. 11 is a drawing for explaining a phenomenon in which the connection portion of the terminal and the CID is broken as the terminal rises when the CID of the present invention is connected to both the first connection portion and the second connection portion of the current collector in the battery cell illustrated in FIGS. 5 and 6.

[0068] First, referring to FIG. 5, the current collector (30) may include a first coupling portion (31) and a second coupling portion (32). The first coupling portion (31) may be electrically coupled to the electrode assembly (10). The first coupling portion (31) may be coupled, for example, to the first uncoated portion (11) of the electrode assembly (10). The second coupling portion (32) may be positioned spaced apart from the first coupling portion (31) along the radial direction of the electrode assembly (10). The second coupling portion (32) may be coupled to the terminal (40) with the CID (50) interposed therebetween.

[0069] According to the structure of the current collector (30) of the present invention, the first coupling portion (31) provided for coupling with the electrode assembly (10) and the second coupling portion (32) provided for coupling with the terminal (40) are not directly connected to each other, but are indirectly connected. Therefore, when an impact is applied to either the welding portion formed in the first coupling portion (31) or the welding portion formed in the second coupling portion (32), the impact can be prevented from being directly transmitted to the other portion. This can reduce the risk of damage to the welding portion due to external impact.

[0070] The second coupling portion (32) may be provided at a position corresponding to the winding center hole (10a) of the electrode assembly (10). In the drawings of the present invention, the second coupling portion (32) is illustrated as having a larger size to cover the winding center hole (10a), but the present invention is not limited thereto. The second coupling portion (32) may have a size substantially the same as or smaller than the winding center hole (10a).

[0071] Referring to FIGS. 7 and 8, the current collector (30) may include a connecting portion (33) configured to electrically connect the first connecting portion (31) and the second connecting portion (32). The connecting portion (33) may include a rim portion (33a) having a substantially rim shape with a hollow center, and a bridge portion (33b) connecting the rim portion (33a) and the second connecting portion (32). One or more bridge portions (33b) may be provided. The first connecting portion (31) may extend inward from the rim portion (33a). The first connecting portion (31) may be provided in plurality. In this case, the second connecting portion (32) may be arranged to be surrounded by a plurality of first connecting portions (31).

[0072] Referring again to FIG. 5, the CID (50) may be coupled to both the first coupling portion (31) and the second coupling portion (32). In this case, when the internal pressure of the battery cell (1) increases, a break in the welding portion between the terminal (40) and the CID (50) may occur quickly as shown in FIG. 6, thereby quickly blocking the electrical flow through the terminal (40). In this case, the CID (50) may be configured to cover both the first coupling portion (31) and the second coupling portion (32) along the radial direction of the electrode assembly (10).

[0073] Referring to FIG. 9, when the CID (50) is omitted and the second connecting portion (32) of the terminal (40) and the current collector (30) are directly connected, it can be seen that the connecting portion between the terminal (40) and the current collector (30) is not easily broken when the terminal (40) is raised.

[0074] Referring to Fig. 10, when the CID (50) is not coupled with the first coupling portion (31) but only with the second coupling portion (32), it can be seen that the coupling portion between the terminal (40) and the current collector (30) is not easily broken when the terminal (40) rises. On the other hand, referring to Fig. 11, when the CID (50) is coupled with both the first coupling portion (31) and the second coupling portion (32), it can be seen that the first coupling portion (31) and the second coupling portion (32), which are spaced apart from each other, are structurally connected (see region C of Fig. 11). Therefore, the phenomenon of the second coupling portion (32) rising together when the terminal (40) rises can be suppressed.

[0075]

[0076] Next, with reference to FIGS. 12 and 15, an embodiment in which a CID gasket (60) is applied to a battery cell (1) of the present invention will be described. FIG. 12 is a drawing showing a battery cell to which a CID gasket is additionally applied in the battery cell shown in FIG. 5, and FIG. 13 is a drawing for explaining breakage of a joint between components as the internal pressure of the battery cell shown in FIG. 12 increases. FIGS. 14 and 15 are drawings showing a battery cell having a structure in which the CID gasket is positioned at a different position compared to the battery cell shown in FIG. 12.

[0077] Referring to FIGS. 12 and 13, the battery cell (1) of the present invention may include a CID gasket (60). The CID gasket (60) may include an insulating material. The CID gasket (60) may be interposed between the closing portion of the housing (20) and the current collector (30). The CID gasket (60) may maintain the separation state when a separation occurs between the current collectors (30) due to an increase in pressure inside the housing (20). The CID gasket (60) may be configured to have an elastic restoring force in the direction of expansion between the closing portion of the housing (20) and the current collector (30). The CID gasket (60) may be interposed between the closing portion and the current collector (30) in a compressed state so as to have a thickness corresponding to the distance between the closing portion and the current collector (30).

[0078] Due to the application of the CID gasket (60), the closing portion of the housing (20), which swells upwards as the internal pressure increases, may not recover its shape and may remain in a deformed state. When the closing portion of the housing (20) swells upwards and undergoes deformation, the terminal (40) may rise together, and thus the joint portion between the terminal (40) and the CID (50) may be broken. When the CID gasket (60) is applied, the terminal (40) and the CID (50) may be maintained in a state where they are spaced apart from each other, and thus the flow of current through the terminal (40) may be maintained in a blocked state.

[0079] The CID gasket (60) may be configured to expand as the temperature inside the housing (20) increases. That is, the CID gasket (60) may include a material that expands due to heat. For example, the CID gasket (60) may include a foamed resin. The CID gasket (60) may be configured to expand, for example, at a temperature at which the closing portion of the housing (20) swells upward.

[0080] The CID gasket (60) may be positioned so that at least a portion thereof is interposed between the CID (50) and the closing portion of the housing (20). When the CID gasket (60) is positioned in this manner, the joint portion between the current collector (30) and the electrode assembly (10) may be pressed by the CID gasket (60). Therefore, when the terminal (40) is raised, the phenomenon in which the joint portion between the current collector (30) and the electrode assembly (10) is damaged before the joint portion between the terminal (40) and the CID (50) is damaged can be prevented. In order to maximize this effect, the CID gasket (60) may be positioned entirely on the CID (50), as illustrated in FIG. 15. However, the position of the CID gasket (60) of the present invention is not limited thereto, and the entire area may be positioned entirely on the outside of the CID (50), as illustrated in FIG. 14.

[0081] Next, with reference to FIGS. 16 to 18, the overall structure and the structure of the lower portion of the battery cell (1) of the present invention will be described in more detail. FIG. 16 is a drawing showing the exterior of the battery cell of the present invention, FIG. 17 is a drawing showing the overall internal structure of the battery cell illustrated in FIG. 16, and FIG. 18 is a partial cross-sectional view showing the structure of the lower portion of the battery cell of the present invention.

[0082] Referring to FIGS. 16 to 18, the battery cell (1) of the present invention may include a battery cap (70) configured to cover an opening of a housing (20). The battery cap (70) may have a venting portion (71) configured to be weaker than the surrounding area. The venting portion (71) may be configured to have a thinner thickness than the surrounding area, for example, by notching one or both sides of the battery cap (70).

[0083] In this way, when the battery cell (1) of the present invention is provided with a venting portion (71), the joint portion between the terminal (40) and the CID (50) of the present invention described above may be configured to be ruptured at a pressure lower than the venting pressure of the venting portion (71), i.e., the pressure at which the venting portion (71) is ruptured. This is to ensure safety in battery use by blocking the flow of current through the terminal (40) before a thermal event due to venting spreads.

[0084] The battery cell (1) of the present invention may include a sealing gasket (G2) interposed between the battery cap (70) and the inner surface of the housing (20). The sealing gasket (G2) may be configured to enhance the sealing property of the housing (20).

[0085] Meanwhile, the battery cell (1) of the present invention may be configured such that the terminal (40) and the closed portion of the housing (20) function as a first electrode terminal and a second electrode terminal, respectively. As described above, the terminal (40) may be electrically connected to the first uncoated portion (11) of the electrode assembly (10) via the current collector (first current collector) (30), thereby having a first polarity. The housing (20) may be electrically connected to the second uncoated portion (12) of the electrode assembly (10), thereby having a second polarity.

[0086] The electrical connection between the housing (20) and the second non-coated portion (12) of the electrode assembly (10) may be made, for example, through a second current collector (P). The second non-coated portion (12), like the first non-coated portion (11) described above, refers to an area of ​​the second electrode where the electrode active material is not coated. The second non-coated portion (12) may be formed at one end of the second electrode and may extend along the winding direction of the electrode assembly (10). The second non-coated portion (12) may extend downward along the height direction (parallel to the Z-axis) of the electrode assembly (10). The second current collector (P) may be coupled onto the second non-coated portion (12). The second non-coated portion (12), like the first non-coated portion (11) described above, may have segments, and the segments may be bent toward the core of the electrode assembly (10). The segments of the folded second non-conductive portion (12) can be overlapped to form multiple layers. In this way, when the segments of the first non-conductive portion (12) are folded, the second current collector (P) can be bonded to a roughly flat surface formed by the folding of the second non-conductive portion (12).

[0087] The second current collector (P) may be coupled to the inner surface of the housing (20). The housing (20) may have a beading portion (21) pressed along the outer circumference. The housing (20) may have a crimping portion (22) formed by extending and bending from the beading portion (21) so as to wrap around the edge of the battery cap (70). The second current collector (P) may be interposed between one surface of the beading portion (21) and a sealing gasket (G2).

[0088]

[0089] Next, a battery pack (3) according to one embodiment of the present invention will be described with reference to FIG. 19. FIG. 19 is a drawing showing a battery pack according to one embodiment of the present invention.

[0090] Referring to FIG. 19 together with FIG. 17 and FIG. 18, a battery pack (3) according to an embodiment of the present invention may include a battery cell (1) according to an embodiment of the present invention and a pack housing (2) accommodating the battery cell (1). A plurality of battery cells (1) may be provided, and the plurality of battery cells (1) may be electrically connected to each other. As described above, the battery cell (1) of the present invention may be configured such that the terminal (40) and the closing portion of the housing (20) may function as a first electrode terminal and a second electrode terminal, respectively (see FIG. 17 and FIG. 18). Therefore, when arranging a plurality of battery cells (1) within the pack housing (2), electrical connection can be made at the upper portion of the battery cells (1) by arranging all of the battery cells (1) with the terminals (40) facing upward.

[0091] Next, with reference to Fig. 20, a vehicle (5) according to one embodiment of the present invention will be described. Fig. 20 is a drawing showing a vehicle according to one embodiment of the present invention.

[0092] Referring to FIG. 20, a vehicle (5) according to one embodiment of the present invention may include a battery pack (3) according to one embodiment of the present invention. The vehicle (5) may be configured to operate by receiving power from the battery pack (3). The vehicle (5) may be, for example, an electric vehicle or a hybrid vehicle.

[0093]

[0094] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical idea of ​​the present invention and the equivalent scope of the patent claims to be described below by a person having ordinary skill in the art to which the present invention pertains.

[0095] [Explanation of symbols]

[0096] 5: Car

[0097] 3: Battery pack

[0098] 1: Battery cell

[0099] 10: Electrode assembly

[0100] 10a: Winding center hole

[0101] 11: Mujibu (1st Mujibu)

[0102] 12: Mujibu (2nd Mujibu)

[0103] 20: Housing

[0104] 21: Bidding Department

[0105] 22: Crimping section

[0106] 30: Whole house (1st whole house)

[0107] 31: First joint

[0108] 32: Second joint

[0109] 33: Connection

[0110] 33a: Border

[0111] 33b: Bridge section

[0112] IS: Insulator

[0113] 40: Terminal

[0114] G1: Insulating gasket

[0115] 50: CID

[0116] 60: CID gasket

[0117] 70: Battery cap

[0118] 71: Benting Department

[0119] G2: Sealing gasket

[0120] P: Whole house (second whole house)

Claims

1. Electrode assembly; A housing having an opening formed on one side to accommodate the electrode assembly and a closed portion formed on the opposite side of the opening; A current collector disposed between the electrode assembly and the closure member and electrically coupled to the electrode assembly; a terminal electrically coupled to the electrode assembly through the closure; and A CID interposed between the terminal and the current collector and bonded with the current collector with a greater bonding force than the terminal; Battery cells containing .

2. In paragraph 1, A battery cell characterized in that the area of ​​the bonding surface between the CID and the current collector is wider than the area of ​​the bonding surface between the CID and the terminal.

3. In paragraph 1, A battery cell characterized in that the bonding surface formed at the lower end of the terminal is provided at a position corresponding to the winding center hole of the electrode assembly.

4. In paragraph 3, The above CID is, A battery cell characterized in that it is coupled to the collector on the inner and outer sides of the area corresponding to the above-mentioned winding center hole.

5. In paragraph 1, The above-mentioned entire house, a first coupling portion electrically coupled to the electrode assembly; and A second coupling portion positioned spaced apart from the first coupling portion along the radial direction of the electrode assembly and provided at a position corresponding to the winding center hole of the electrode assembly; A battery cell characterized by including:

6. In paragraph 5, The above CID is, A battery cell characterized in that it is coupled to both the first coupling portion and the second coupling portion.

7. In paragraph 6, The above CID is, A battery cell characterized in that it is configured to cover both the first coupling portion and the second coupling portion along the radial direction of the electrode assembly.

8. In paragraph 1, The above battery cell, A battery cell characterized by including a CID gasket interposed between the closing portion and the current collector, and maintaining a separation state when a separation occurs between the closing portion and the current collector due to an increase in pressure inside the housing.

9. In paragraph 8, The above CID gasket is, A battery cell characterized in that it is configured to have elastic restoring force in the direction of expansion between the above-mentioned closing portion and the above-mentioned collector.

10. In paragraph 8, The above CID gasket is, A battery cell characterized in that it is configured to expand according to an increase in temperature inside the housing.

11. In paragraph 8, The above CID gasket is, A battery cell characterized in that at least a portion thereof is interposed between the CID and the closure member.

12. In paragraph 1, The above battery cell includes a battery cap configured to cover the opening, A battery cell characterized in that the battery cap has a venting portion that is configured to be more vulnerable compared to the surroundings.

13. In paragraph 12, A battery cell characterized in that the joint between the terminal and the CID is configured to break at a pressure lower than the venting pressure of the venting portion.

14. A battery pack comprising a battery cell according to any one of claims 1 to 13.

15. A vehicle including a battery pack according to Article 14.

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