Battery cell, and battery pack and vehicle including the battery cell

Abstract

A battery cell according to an embodiment of the present invention comprises: an electrode assembly; a case configured to accommodate the electrode assembly through an opening portion provided on one side of the case, and having a closed portion formed on an opposite side from the opening portion; a current collector disposed between the electrode assembly and the enclosed portion and electrically coupled to the electrode assembly; a terminal electrically coupled with the electrode assembly through the closed portion; and a CID interposed between the terminal and the current collector and coupled to the current collector with a coupling force greater than that of the terminal.

Description

Technical Field

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

[0002] This application claims priority to Korean Patent Application No. 10-2023-0077099 filed in Korea on June 15, 2023, the disclosure of which is incorporated herein by reference. Background Art

[0003] Current fuse devices for secondary batteries include PTC thermistors (positive temperature coefficient thermistors) and TCOs (thermal circuit breakers). However, PTCs or TCOs have the disadvantage that their resistance increases with repeated operations, thereby increasing the total resistance in the circuit.

[0004] In addition, the above devices are all operated by heat generation due to overcurrent. In other words, the above devices correspond to devices that operate to block the flow of current only when overcurrent is generated in the circuit current path due to overcharging, etc., so the temperature eventually rises.

[0005] Therefore, the above device can operate and block overcurrent only after safety has been threatened due to heat generation, and cannot immediately block overcurrent when the cause for temperature increase occurs. Even if the internal pressure increases due to abnormal temperature increase inside the secondary battery, if the overcurrent is not blocked at an appropriate time, safety problems such as fire or explosion may occur.

[0006] In addition, since the above devices simply operate according to temperature, it is difficult to use these devices in high-output secondary batteries such as secondary batteries for battery packs used in vehicles. In other words, battery packs for vehicles require high c-rates and therefore generate a lot of heat. However, devices such as PTC thermistors (positive temperature coefficient thermistors), TCOs (thermal circuit breakers), and thermal fuses have the problem that they may operate prematurely when placed in such a high temperature environment.

[0007] Therefore, there is a need for a secondary battery having a structure that can be used even in an environment where high current flows and that can block current in advance before the temperature rises to a level that may cause safety problems when an event that may cause a temperature increase (e.g., an increase in the internal pressure of the secondary battery) occurs. Summary of the invention

[0008] Technical issues

[0009] The present disclosure is designed to solve the problems of the related art, and thus the present disclosure is directed to providing a battery cell having a structure that can quickly block current when an abnormal situation occurs in the battery cell, and a battery pack and a vehicle including the battery cell.

[0010] However, the technical objectives to be solved by the present disclosure are not limited to the above contents, and those skilled in the art will clearly understand other objectives not mentioned herein based on the following disclosure.

[0011] Technical Solution

[0012] In one aspect of the present disclosure, a battery cell is provided, comprising: an electrode assembly; a shell configured to accommodate the electrode assembly through an opening portion provided on one side and having a closed portion formed on a side opposite to the opening portion; a current collector provided between the electrode assembly and the closed portion and electrically connected to the electrode assembly; a terminal electrically connected to the electrode assembly through the closed portion; and a CID interposed between the terminal and the current collector and connected to the current collector, the CID being connected to the current collector with a coupling force greater than a coupling force with the terminal.

[0013] An area of ​​a coupling surface between the CID and the current collector may be greater than an area of ​​a coupling surface between the CID and the terminal.

[0014] The coupling surface formed at the lower end of the terminal may be disposed at a position corresponding to the winding center hole of the electrode assembly.

[0015] The CID may be coupled with the current collector at the inside and outside of a region corresponding to the winding central hole.

[0016] The current collector may include: a first connecting portion, which is electrically connected to the electrode assembly; and a second connecting portion, which is positioned to be spaced apart from the first connecting portion along the radial direction of the electrode assembly and is disposed at a position corresponding to a winding center hole of the electrode assembly.

[0017] The CID may be coupled to both the first coupling portion and the second coupling portion.

[0018] The CID may be configured to cover both the first coupling portion and the second coupling portion in a radial direction of the electrode assembly.

[0019] The battery cell may include a CID gasket interposed between the closing portion and the current collector and configured to maintain a separated state when the terminal and the CID are separated from each other due to an increase in pressure inside the case.

[0020] The CID gasket may be configured to have an elastic restoring force in an expansion direction between the closing portion and the current collector.

[0021] The CID gasket may be configured to expand as the temperature inside the housing increases.

[0022] The CID gasket may be at least partially interposed between the CID and the closure portion.

[0023] The battery cell may include a battery cover configured to cover the opening portion.

[0024] The battery cover may have a vent portion that is configured to be weaker than a surrounding area.

[0025] The coupling portion between the terminal and the CID may be configured to rupture at a pressure lower than an exhaust pressure of the exhaust portion.

[0026] In another aspect of the present disclosure, a battery pack is provided, comprising: a battery cell according to the embodiment of the present disclosure.

[0027] In another aspect of the present disclosure, a vehicle is also provided, which includes the battery pack according to the embodiment of the present disclosure.

[0028] Beneficial Effects

[0029] According to one aspect of the present disclosure, when an abnormal situation occurs in a battery cell, current can be quickly blocked, thereby ensuring safety in use of a secondary battery.

[0030] According to another aspect of the present disclosure, it is possible to prevent electrical connection from occurring again after current is blocked due to an abnormality occurring in a battery cell.

[0031] According to yet another aspect of the present disclosure, current may be blocked in advance before exhaust of a battery cell occurs, thereby further improving the safety of the secondary battery in use.

[0032] However, beneficial effects that can be obtained by the present disclosure are not limited to the above-mentioned effects, and other beneficial effects not mentioned above will be clearly understood by those skilled in the art from the following disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings illustrate preferred embodiments of the present disclosure and, together with the foregoing disclosure, are used to provide a further understanding of the technical features of the present disclosure, and therefore, the present disclosure is not interpreted as being limited to the accompanying drawings.

[0034] Figure 1 is a perspective view showing the structure of an upper portion of a battery cell according to an embodiment of the present disclosure.

[0035] Figure 2 is used to show when Figure 1 FIG. 4 is a diagram showing rupture of a connection portion between components when the internal pressure of a battery cell increases.

[0036] Figure 3 is used to show when the CID of the present disclosure is in Figure 1 and Figure 2 FIG. 1 is a diagram showing a phenomenon in which the coupled portion of the terminal and the current collector moves together as the terminal is raised without being broken when the battery cell shown in FIG. 1 is omitted.

[0037] Figure 4 is used to show when the CID of the present disclosure is applied to Figure 1 and Figure 2 The figure shows the phenomenon that the connection part of the terminal and CID of the battery cell shown in FIG. 1 is broken as the terminal rises.

[0038] Figure 5 It shows that the application Figure 1 The current collectors shown in FIG. 5 are diagrams of battery cells with different types of current collectors.

[0039] Figure 6 is used to show when Figure 5 FIG. 4 is a diagram showing rupture of a connection portion between components when the internal pressure of a battery cell increases.

[0040] Figure 7 and Figure 8 It is shown that the application Figure 5 and Figure 6 An exemplary form of a current collector for a battery cell is shown in FIG.

[0041] Fig. 9 is a diagram for illustrating the following phenomenon: Figure 5 and Figure 6 When the CID of the present disclosure is omitted from the illustrated battery cell, the coupled portion of the terminal and the current collector moves together as the terminal rises without breaking.

[0042] Fig.10 is a diagram for illustrating the following phenomenon: when the CID of the present disclosure is only connected to Figure 5 and Figure 6 When the second coupling portion of the current collector in the battery cell shown in FIG. 1 is removed, the coupling portion of the terminal and the CID moves together as the terminal rises without being broken.

[0043] Fig.11 is a diagram for illustrating the following phenomenon: when the CID of the present disclosure is Figure 5 and Figure 6 When both the first coupling portion and the second coupling portion of the current collector in the battery cell shown in are coupled, the coupling portion of the terminal and the CID are broken as the terminal rises.

[0044] Fig.12 It is shown in Figure 5 FIG. 4 is a diagram of a battery cell in which a CID gasket is additionally applied in the battery cell shown in FIG.

[0045] Fig.13 is used to show when Fig.12 FIG. 4 is a diagram showing rupture of a connection portion between components when the internal pressure of a battery cell increases.

[0046] Fig.14 and Fig.15 is a diagram showing a battery cell having the following structure: Fig.12 The CID gasket is arranged at a different position compared to the battery cell shown in FIG.

[0047] Fig.16 is a diagram showing the appearance of a battery cell according to the present disclosure.

[0048] Fig.17 It is shown Fig.16 A diagram of the overall internal structure of a battery cell is shown in FIG.

[0049] Fig.18 is a partial cross-sectional view showing the structure of the lower portion of a battery cell according to the present disclosure.

[0050] Fig.19 is a diagram showing a battery pack according to an embodiment of the present disclosure.

[0051] Fig. 20 is a diagram showing a vehicle according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0052] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Before the description, it should be understood that the terms used in the specification and the appended claims should not be interpreted as limited to the general meaning and dictionary meaning, but should be interpreted according to the meaning and concept corresponding to the technical aspects of the present disclosure based on the principle that the inventor is allowed to appropriately define the terms for the best interpretation. Therefore, the description proposed herein is only a preferred example for the purpose of illustration only, and is not intended to limit the scope of the present disclosure, so it should be understood that other equivalents and modifications may be made to the description proposed herein without departing from the scope of the present disclosure.

[0053] Reference Figures 1 to 4 A battery cell 1 according to an embodiment of the present disclosure is described. Figure 1 is a perspective view showing the structure of the upper portion of a battery cell according to an embodiment of the present disclosure, and Figure 2 is used to show when Figure 1 FIG. 4 is a diagram showing rupture of a connection portion between components when the internal pressure of a battery cell increases. Figure 3 is used to show when Figure 1 and Figure 2FIG. 2 is a diagram showing a phenomenon in which the connection portion of the terminal and the current collector moves together without breaking as the terminal rises when the CID of the present disclosure is omitted in the battery cell shown in FIG. 2 , and Figure 4 is used to show that when the CID of the present disclosure is applied to Figure 1 and Figure 2 FIG. 4 is a diagram showing a phenomenon in which the connection portion between the battery cell terminal and the CID is broken as the terminal rises.

[0054] First, refer to Figure 1 , a battery cell 1 according to an embodiment of the present disclosure may include an electrode assembly 10 , a case 20 , a current collector (first current collector) 30 , a terminal 40 , and a CID (current interrupt device) 50 .

[0055] 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 cake-type electrode assembly, in which a stack including a first electrode, a second electrode, and a separator is wound in one direction. The electrode assembly 10 may have a first uncoated portion 11 at the top. The first uncoated portion 11 refers to an area of ​​the first electrode that is not coated with an electrode active material. The first uncoated portion 11 may be formed at one end of the first electrode and may extend along the winding direction of the electrode assembly 10. The first uncoated portion 11 may extend upward along the height direction (direction parallel to the Z axis) of the electrode assembly 10.

[0056] The case 20 may be configured to accommodate the electrode assembly 10 through an opening portion provided at one side. The case 20 may have a closing portion formed at one side opposite to the opening portion.

[0057] The current collector 30 may be disposed between the electrode assembly 10 and the enclosed portion of the case 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 uncoated portion 11 disposed at the top end of the electrode assembly 10. The current collector 30 and the electrode assembly 10 may be coupled to each other, for example, by laser welding, ultrasonic welding, or the like.

[0058] At the same time, the first non-coating portion 11 may have segments formed by segmenting along the winding direction of the electrode assembly 10, and these segments may be bent, for example, toward the core of the electrode assembly 10. The bent segments of the first non-coating portion 11 may overlap each other to form a plurality of layers. When the segments of the first non-coating portion 11 are bent in this manner, the current collector 30 may be coupled to an approximately flat surface formed by bending the first non-coating portion 11.

[0059] The terminal 40 may be electrically coupled to the electrode assembly 10 through the closed portion of the case 20. The terminal 40 may, for example, penetrate approximately the center of the closed portion of the case 20. The terminal 40 may be fixed on the inner surface of the closed portion of the case 20, for example, by riveting.

[0060] The CID 50 may be interposed between the terminal 40 and the current collector 30. The CID 50 may be a plate containing a conductive metal. A first side of the CID 50 may be coupled to the terminal 40, and a second side as a side opposite to the first side may be coupled to the current collector 30. The CID 50 may be coupled to the current collector 30. The CID may be coupled to the current collector with a coupling force greater than the coupling force with the terminal. In other words, the coupling force between the first side of the CID 50 and the terminal 40 may be stronger than the coupling force between the second side of the CID 50 and the current collector 30.

[0061] refer to Figure 2 Since the coupling force between components is formed differently using the CID 50 , when the housing 20 expands due to the increase in the internal pressure of the battery cell 1 , the coupling portion between the terminal 40 and the CID 50 may be quickly ruptured, which may block the flow of current through the terminal 40 .

[0062] refer to Figure 3 , unlike the battery cell 1 of the present disclosure, in the battery cell 1 not applying the CID 50, when the terminal 40 rises due to the increase of the internal pressure, before the connection portion between the current collector 30 and the terminal 40 is ruptured, the connection portion between the current collector 30 and the electrode assembly 10 may be partially ruptured first and / or the rupture of the connection portion between the current collector 30 and the terminal 40 may be delayed as the current collector 30 is bent.

[0063] The difference in coupling force as described above may be caused, for example, by a difference in coupling surface area. For example, the area of ​​the coupling surface between the CID 50 and the current collector 30 may be greater than the area of ​​the coupling surface between the CID 50 and the terminal 40.

[0064] After the CID 50 is welded to the current collector 30 connected to the electrode assembly 10, the combined body including the electrode assembly 10, the current collector 30, and the CID 50 may be pushed through the opening portion of the case 20 so that the CID 50 is in contact with the bottom of the terminal 40. Next, the current collector 30, the CID 50, and the terminal 40 may be welded by irradiating a laser or inserting a welding device through the winding center hole 10a formed at approximately the center of the electrode assembly 10. At this time, since the welding area between the CID 50 and the terminal 40 is smaller than the welding area between the current collector 30 and the CID 50, the welding area between the terminal 40 and the CID 50 may be rapidly ruptured due to the increase in internal pressure.

[0065] The coupling surface formed at the lower end of the terminal 40 may be disposed at a position corresponding to the winding center hole 10a of the electrode assembly 10. In this case, the current collector 30 cannot be coupled to the electrode assembly 10 at a position corresponding to the coupling portion of the CID 50 and the terminal 40. Therefore, when the closed portion is bent due to an increase in the internal pressure of the battery cell 1 and the terminal 40 rises accordingly, the current collector 30 may be bent in an area corresponding to the winding center hole 10a. Such bending of the current collector 30 may be a cause of interference with the rupture of the coupling portion between the terminal 40 and the CID 50. If the CID 50 of the present disclosure is applied, the CID 50 may enhance the rigidity of the current collector 30, and thus the rupture of the coupling portion between the terminal 40 and the CID 50 may occur more quickly.

[0066] refer to Figure 4 as well as Figures 1 to 3 , the CID 50 may be coupled to the current collector 30 at the inner side (B region) and the outer side (A region) of the region corresponding to the winding center hole 10a. In this case, the bending of the current collector 30 and the CID 50 may be further suppressed, and thus the coupling portion of the terminal 40 and the CID 50 may be broken more quickly.

[0067] At the same time, reference Figure 1 and Figure 2 , the battery cell 1 of the present disclosure may include an insulator IS and / or an insulating gasket G1. The insulator IS may be disposed in a space formed between the enclosed portion of the shell 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 shell 20 configured to have different polarities. The insulating gasket G1 may be inserted between the terminal 40 and the shell 20. The insulating gasket G1 may include an insulating material. The insulating gasket G1 may prevent contact between the terminal 40 and the shell 20 configured to have different polarities.

[0068] Next, we will refer to Figures 5 to 11 A battery cell 1 having a structure different from the above-described structure is described. Figure 5 It shows that the application Figure 1 Figure 1 shows a diagram of a battery cell with different types of current collectors, and Figure 6 is used to show when Figure 5 FIG. 4 is a diagram showing rupture of a connection portion between components when the internal pressure of a battery cell increases. Figure 7 and Figure 8 It is shown that the application Figure 5 and Figure 6 A diagram of an exemplary form of a current collector for a battery cell is shown. Fig. 9 is a diagram for illustrating the following phenomenon: Figure 5 and Figure 6 When the CID of the present disclosure is omitted from the battery cell shown in FIG, the coupled portion of the terminal and the current collector moves together as the terminal rises without being broken. Fig.10 is a diagram for illustrating the following phenomenon: when the CID of the present disclosure is only connected to Figure 5 and Figure 6 When the second coupling portion of the current collector in the battery cell shown in FIG. 1 is removed, the coupling portion of the terminal and the CID moves together as the terminal rises without being broken. Fig.11 is a diagram for illustrating the following phenomenon: when the CID of the present disclosure is Figure 5 and Figure 6 When both the first coupling portion and the second coupling portion of the current collector in the battery cell shown in FIG. 1 are coupled, the coupling portion of the terminal and the CID is broken as the terminal rises.

[0069] First, refer to Figure 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 to be 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.

[0070] According to the structure of the current collector 30 of the present disclosure, 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 one of the welding portion formed in the first coupling portion 31 and the welding portion formed in the second coupling portion 32, the impact can be prevented from being directly transferred to the other. This can reduce the risk of damaging the welding portion due to external impact.

[0071] The second coupling portion 32 may be disposed at a position corresponding to the winding center hole 10a of the electrode assembly 10. In the drawings of the present disclosure, the second coupling portion 32 is shown as having a larger size to cover the winding center hole 10a, but the present disclosure 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.

[0072] refer to Figure 7 and Figure 8, the current collector 30 may include a coupling portion 33 configured to electrically connect the first coupling portion 31 and the second coupling portion 32. The coupling portion 33 may include: a boundary portion 33a having an approximately rim shape with a hollow center; and a bridging portion 33b for connecting the boundary portion 33a and the second coupling portion 32. The bridging portion 33b may be provided in one or more. The first coupling portion 31 may extend inwardly from the boundary portion 33a. The first coupling portion 31 may be provided in plurality. In this case, the second coupling portion 32 may be arranged to be surrounded by a plurality of first coupling portions 31.

[0073] Reference again Figure 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, the welded portion between the terminal 40 and the CID 50 may be welded as shown in FIG. Figure 6 The electrode assembly 10 is shown to be rapidly broken, thereby rapidly blocking the current passing 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.

[0074] refer to Fig. 9 , when the CID 50 is omitted and the terminal 40 and the second coupling portion 32 of the current collector 30 are directly coupled, it can be found that when the terminal 40 is lifted, the coupling portion between the terminal 40 and the current collector 30 is not easily broken.

[0075] refer to Fig.10 , when the CID 50 is not coupled to the first coupling portion 31 but only to the second coupling portion 32, it can be found that when the terminal 40 is raised, the coupling portion between the terminal 40 and the current collector 30 is not easily broken. Fig.11 When the CID 50 is coupled to both the first coupling portion 31 and the second coupling portion 32, it can be found that the first coupling portion 31 and the second coupling portion 32 spaced apart from each other are structurally connected (see Fig.11 Therefore, the phenomenon that the second coupling portion 32 rises together with the rise of the terminal 40 can be suppressed.

[0076] Next, we will refer to Fig.12 and Fig.15 An embodiment in which the CID gasket 60 is applied to the battery cell 1 of the present disclosure is described. Fig.12 It is shown in Figure 5 A diagram of a battery cell in which a CID gasket is additionally applied in the battery cell shown in FIG. 1 , and Fig.13 is used to show when Fig.12 FIG. 4 is a diagram showing rupture of a connection portion between components when the internal pressure of a battery cell increases. Fig.14 and Fig.15 is a diagram showing a battery cell having the following structure: Fig.12 The CID gasket is arranged at a different position compared to the battery cell shown in FIG.

[0077] refer to Fig.12 and Fig.13 , the battery cell 1 of the present disclosure may include a CID gasket 60. The CID gasket 60 may include a material having insulating properties. The CID gasket 60 may be inserted between the closed portion of the housing 20 and the current collector 30. When the terminal 40 and the CID 50 are separated from each other due to the increase in pressure inside the housing 20, the CID gasket 60 may remain in a separated state. The CID gasket 60 may be configured to have an elastic restoring force in an expansion direction between the closed portion of the housing 20 and the current collector 30. The CID gasket 60 may be inserted between the closed portion and the current collector 30 in a compressed state to have a thickness corresponding to the distance between the closed portion and the current collector 30.

[0078] By applying the CID gasket 60, the closed portion of the housing 20 that bulges upward due to the increase in internal pressure may not return to its original shape, but remain in a deformed state. When the closed portion of the housing 20 is deformed to bulge upward, the terminal 40 may rise together, and the connection portion between the terminal 40 and the CID 50 may be broken accordingly. When the CID gasket 60 is applied, the terminal 40 and the CID 50 can be kept spaced apart from each other, and the current flow through the terminal 40 can be kept blocked.

[0079] The CID gasket 60 may be configured to expand as the temperature inside the housing 20 increases. In other words, 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 closed portion of the housing 20 bulges upward.

[0080] The CID gasket 60 may be arranged to be at least partially interposed between the CID 50 and the closed portion of the case 20. When the CID gasket 60 is arranged like this, the coupling portion between the current collector 30 and the electrode assembly 10 may be pressurized by the CID gasket 60. Therefore, when the terminal 40 rises, the coupling portion between the current collector 30 and the electrode assembly 10 may be prevented from being damaged first before the coupling portion between the terminal 40 and the CID 50 is damaged. To maximize this effect, the entire area of ​​the CID gasket 60 may be located on the CID 50, such as Fig.15 However, the position where the CID gasket 60 of the present disclosure is disposed is not limited thereto, and the entire area of ​​the CID gasket 60 may be located outside the CID 50, such as Fig.14 shown.

[0081] Next, we will refer to Figures 16 to 18 The overall structure of the battery cell 1 of the present disclosure and the structure of its lower portion are described in more detail. Fig.16 is a diagram showing the appearance of a battery cell according to the present disclosure, Fig.17 It is shown Fig.16 The overall internal structure of the battery cell is shown in FIG. Fig.18 is a partial cross-sectional view showing the structure of the lower portion of a battery cell according to the present disclosure.

[0082] refer to Figures 16 to 18 , the battery cell 1 of the present disclosure may include a battery cover 70 configured to cover the opening portion of the housing 20. The battery cover 70 may have a vent portion 71 configured to be weaker than the surrounding area. For example, by notching one or both sides of the battery cover 70, the vent portion 71 may be configured to have a smaller thickness than the surrounding area.

[0083] If the battery cell 1 of the present disclosure has the vent portion 71 as described above, the coupling portion between the CID 50 of the present disclosure and the terminal 40 as described above can be configured to rupture at a pressure lower than the vent pressure of the vent portion 71 (i.e., the pressure at which the vent portion 71 ruptures). This is to ensure the safety of battery use by blocking the flow of current through the terminal 40 before a thermal event caused by the diffusion of exhaust gas occurs.

[0084] The battery cell 1 of the present disclosure may include a sealing gasket G2 interposed between the battery cover 70 and the inner surface of the case 20. The sealing gasket G2 may be configured to enhance the sealing property of the case 20.

[0085] Meanwhile, the battery cell 1 of the present disclosure may be configured such that the terminal 40 and the enclosed portion of the housing 20 serve as the first electrode terminal and the 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 through the current collector (first current collector) 30, and thus may have a first polarity. The housing 20 may be electrically connected to the second uncoated portion 12 of the electrode assembly 10, and thus may have a second polarity.

[0086] The second uncoated portion 12 of the case 20 and the electrode assembly 10 may be electrically connected, for example, by a second current collector P. Similar to the first uncoated portion 11 described above, the second uncoated portion 12 refers to an area in the second electrode that is not coated with an electrode active material. The second uncoated 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 uncoated portion 12 may extend downward along the height direction (direction parallel to the Z axis) of the electrode assembly 10. The second current collector P may be coupled to the second uncoated portion 12. The second uncoated portion 12 may have segments similar to the first uncoated portion 11 described above, and these segments may be bent toward the core of the electrode assembly 10. The bent segments of the second uncoated portion 12 may overlap each other to form a plurality of layers. When the segments of the second uncoated portion 12 are bent in this manner, the second current collector P may be coupled to an approximately flat surface formed by bending the second uncoated portion 12.

[0087] The second current collector P may be coupled to the inner side of the case 20. The case 20 may include a crimping portion 21 press-fitted along an outer circumference. The case 20 may include a crimping portion 22 formed to extend from the crimping portion 21 and bend to surround the peripheral edge of the battery cover 70. The second current collector P may be interposed between one side of the crimping portion 21 and the sealing gasket G2.

[0088] Next, we will refer to Fig.19 A battery pack 3 according to an embodiment of the present disclosure is described. Fig.19 is a diagram showing a battery pack according to an embodiment of the present disclosure.

[0089] refer to Fig.19 as well as Fig.17 and Fig.18 , a battery pack 3 according to an embodiment of the present disclosure may include a battery cell 1 according to an embodiment of the present disclosure and a battery pack case 2 configured to accommodate the battery cell 1. The battery cell 1 may be provided in plurality, and the plurality of battery cells 1 may be electrically connected to each other. As described above, the battery cell 1 of the present disclosure may be configured such that the terminal 40 and the enclosed portion of the case 20 may be used as a first electrode terminal and a second electrode terminal, respectively (see Fig.17 and Fig.18 ). Therefore, when a plurality of battery cells 1 are arranged in the battery pack case 2 , all of the battery cells 1 can be arranged so that the terminals 40 face upward, and thus electrical connection can be made at the top of the battery cells 1 .

[0090] Next, we will refer to Fig. 20 A vehicle 5 according to an embodiment of the present disclosure is described. Fig. 20 is a diagram showing a vehicle according to an embodiment of the present disclosure.

[0091] refer to Fig. 20 , a vehicle 5 according to an embodiment of the present disclosure may include a battery pack 3 according to an embodiment of the present disclosure. 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.

[0092] The present disclosure has been described in detail. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the present disclosure, are given by way of illustration only, since various changes and modifications within the scope of the present disclosure will become apparent to those skilled in the art from this detailed description.

[0093] Reference numerals

[0094] 5: Vehicles

[0095] 3: Battery Pack

[0096] 1: Battery Cell

[0097] 10: Electrode assembly

[0098] 10a: Winding center hole

[0099] 11: Uncoated portion (first uncoated portion)

[0100] 12: Uncoated portion (second uncoated portion)

[0101] 20: Shell

[0102] 21: Curling part

[0103] 22: Crimping part

[0104] 30: Current collector (first current collector)

[0105] 31: First connection part

[0106] 32: Second connection part

[0107] 33: Connection part

[0108] 33a: Boundary section

[0109] 33b: Bridging section

[0110] IS: Insulator

[0111] 40: Terminal

[0112] G1: Insulation washer

[0113] 50: CID

[0114] 60: CID gasket

[0115] 70: Battery cover

[0116] 71: Exhaust part

[0117] G2: Sealing gasket

[0118] P: Current collector (second current collector)

Claims

1. A battery cell, comprising: Electrode assembly; a case configured to accommodate the electrode assembly through an opening portion provided at one side and having a closed portion formed at a side opposite to the opening portion; a current collector disposed between the electrode assembly and the enclosing portion and electrically coupled to the electrode assembly; a terminal electrically coupled to the electrode assembly through the enclosed portion; as well as A CID is interposed between the terminal and the current collector and coupled to the current collector, the CID being coupled to the current collector with a coupling force greater than a coupling force with the terminal.

2. The battery cell according to claim 1, in, An area of ​​a connection surface between the CID and the current collector is larger than an area of ​​a connection surface between the CID and the terminal.

3. The battery cell according to claim 1, in, A coupling surface formed at a lower end of the terminal is disposed at a position corresponding to a winding center hole of the electrode assembly.

4. The battery cell according to claim 3, in, The CID is coupled to the current collector at an inner side and an outer side of a region corresponding to the winding center hole.

5. The battery cell according to claim 1, in, The current collector comprises: a first coupling portion coupled to the electrode assembly; and A second coupling portion is positioned to be spaced apart from the first coupling portion in a radial direction of the electrode assembly and is provided at a position corresponding to a winding center hole of the electrode assembly.

6. The battery cell according to claim 5, in, The CID is coupled to both the first coupling portion and the second coupling portion.

7. The battery cell according to claim 6, in, The CID is configured to cover both the first coupling portion and the second coupling portion along the radial direction of the electrode assembly.

8. The battery cell according to claim 1, in, The battery cell includes a CID gasket interposed between the closing portion and the current collector, and the CID gasket is configured to maintain a separated state when the closing portion and the current collector are separated from each other due to an increase in pressure inside the case.

9. The battery cell according to claim 8, in, The CID gasket is configured to have an elastic restoring force in an expansion direction between the closing portion and the current collector.

10. The battery cell according to claim 8, in, The CID gasket is configured to expand as the temperature inside the housing increases.

11. The battery cell according to claim 8, in, The CID gasket is at least partially interposed between the CID and the closure portion.

12. The battery cell according to claim 1, in, The battery cell includes a battery cover configured to cover the opening portion, and Wherein, the battery cover has a venting portion configured to be weaker than a surrounding area.

13. The battery cell according to claim 12, in, A coupling portion between the terminal and the CID is configured to rupture at a pressure lower than an exhaust pressure of the exhaust portion.

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

15. A vehicle comprising the battery pack according to claim 14.

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