Battery unit, battery module, battery pack, and vehicle including same

Abstract

A battery cell according to one embodiment of the present invention may comprise: an electrode assembly in which a first electrode, a second electrode, and a separator interposed therebetween are wound around a winding shaft to define a core and an outer peripheral surface, the first electrode includes a first uncoated portion not coated with an active material layer in a winding direction; a battery case having an opening provided on one side thereof, and receiving the electrode assembly through the opening; a current collector including a support portion disposed on an upper portion of the electrode assembly, a tab coupling portion extending from the support portion and coupled to the first uncoated portion, and a case coupling portion extending from the support portion, electrically coupled to an inner surface of the battery case, and including at least one welded portion welded to the inner surface of the battery case; and a housing cover configured to cover the opening, in which the number of the welded portions is less than or equal to the number of the joint coupling portions, or a fracture portion configured to have a lower strength than the surrounding area is provided at a boundary between the support portion and the housing coupling portion.

Description

Technical Field

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

[0002] This application claims priority to Korean Patent Application No. 10-2022-0187775 filed in Korea on December 28, 2022, and Korean Patent Application No. 10-2023-0069489 filed in Korea on May 30, 2023, the disclosures of which are incorporated herein by reference. Background Art

[0003] Secondary batteries, which are easy to apply according to product groups and have electrical characteristics such as high energy density, are generally used in electric vehicles (EV) or hybrid electric vehicles (HEV) driven by electric drive sources, and portable devices. These secondary batteries have attracted much attention as new energy sources that improve eco-friendliness and energy efficiency because they have the main advantage of being able to significantly reduce the use of fossil fuels and do not produce byproducts due to energy use.

[0004] The types of secondary batteries widely used at present include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, etc. The operating voltage of the unit secondary battery cell (i.e., unit battery cell) is about 2.5V to 4.5V. Therefore, when an output voltage higher than this is required, the battery pack can be configured by connecting a plurality of battery cells in series. In addition, depending on the charge / discharge capacity required for the battery pack, the battery pack can be configured by connecting a plurality of battery cells in parallel. Therefore, depending on the required output voltage and / or charge / discharge capacity, the number of battery cells included in the battery pack can be set in various ways.

[0005] Furthermore, conventional battery cells are designed to improve safety by using a structure in which current flows through the positive electrode via an aluminum joint, which induces the aluminum joint to fuse when a high current flows instantaneously.

[0006] In addition, in the case of a battery cell having the structure of the present disclosure, the current collector and the foil joint are welded together for low resistance design, and the positive current collector and the rivet are directly welded together, so there is no separate electrode joint, which makes it difficult to implement a fuse structure. Even if the fuse structure is designed by changing the design of the positive current collector, there is a problem of increasing the internal resistance of the battery cell. Summary of the invention

[0007] Technical issues

[0008] The present disclosure is intended to solve the problems of the related art, and thus the present disclosure is intended to provide a current collector capable of blocking current under a condition where a high current flows while minimizing an increase in the internal resistance of a battery cell.

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

[0010] Technical Solution

[0011] According to one aspect of the present disclosure, a battery cell is provided, comprising: an electrode assembly, in which a first electrode and a second electrode are wound around a winding axis with a separator interposed therebetween, thereby defining a core portion and an outer peripheral surface, the first electrode comprising a first uncoated portion that is not coated with an active material layer along a winding direction; a battery case having an opening disposed on one side thereof and configured to accommodate the electrode assembly through the opening; a current collector, the current collector comprising: a support portion disposed on an upper portion of the electrode assembly; a joint connection portion extending from the support portion and connected to the first uncoated portion; and a case connection portion extending from the support portion to be electrically connected to an inner surface of the battery case and comprising at least one welding portion welded to the inner surface of the battery case; and a case cover configured to cover the opening, wherein the number of welding portions may be less than or equal to the number of joint connection portions, or wherein a fracture portion configured to have a lower strength than a surrounding area may be provided at a boundary between the support portion and the case connection portion.

[0012] Preferably, the number of the housing coupling parts may be smaller than the number of the joint coupling parts.

[0013] In one aspect of the present disclosure, the case coupling portion may include: a contact portion coupled to an inner surface of the battery case; and a connecting portion connecting the supporting portion and the contact portion.

[0014] Preferably, the connecting portion and the contact portion may have the same width in the extending direction.

[0015] In another aspect of the present disclosure, a breaking portion configured to have a lower strength than a surrounding area is provided at a boundary between the supporting portion and the housing coupling portion.

[0016] In another aspect of the present disclosure, the break portion may be configured in the form of a notch-forming line including a plurality of notches.

[0017] In another aspect of the present disclosure, the housing coupling portion may be configured to be elongated in length.

[0018] Preferably, at least a portion of the housing coupling portion may have a rim shape with a hollow center.

[0019] In another aspect of the present disclosure, the case cover may include a vent portion configured to rupture when the internal pressure of the battery case increases above a certain level.

[0020] Preferably, the radial length of the exhaust portion may be greater than the radial length of the support portion.

[0021] In another aspect of the present disclosure, the battery case may include a press-fitted edge portion formed at an end portion adjacent to the opening and press-fitted inwardly.

[0022] Here, the battery cell may include an insulator interposed between the edge pressing portion and the electrode assembly.

[0023] Preferably, the insulator may be configured to have a shape matching an inner surface of the pressing edge portion.

[0024] Meanwhile, the present disclosure provides a battery pack including at least one battery cell according to the above-mentioned embodiment.

[0025] Furthermore, the present disclosure provides a vehicle including at least one battery pack according to the above-described embodiments.

[0026] Technical Effects

[0027] According to the present disclosure, a current collector capable of blocking current while minimizing an increase in the internal resistance of a battery cell under a condition where a high current flows can be provided.

[0028] However, effects obtainable according to the present disclosure are not limited to the above-mentioned effects, and other technical effects not mentioned above will be clearly understood by those skilled in the art from the description of the present invention described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings illustrate preferred embodiments of the present disclosure and, together with the detailed description of the present invention, are used to provide further understanding of the technical concept of the present disclosure; therefore, the present disclosure should not be construed as being limited to the accompanying drawings.

[0030] Figure 1 is a diagram illustrating a battery cell according to an embodiment of the present disclosure.

[0031] Figure 2 yes Figure 1 Longitudinal cross-sectional view of .

[0032] Figure 3 yes Figure 1 Longitudinal cross-sectional view of a battery cell in FIG.

[0033] Figure 4 is a diagram illustrating a current collector according to an embodiment of the present disclosure.

[0034] Figure 5is a diagram illustrating a current collector as a comparative example of the present disclosure.

[0035] Figure 6 is a diagram illustrating a current collector according to an embodiment of the present disclosure.

[0036] Figure 7 is a diagram illustrating a current collector according to another embodiment of the present disclosure.

[0037] Figure 8 is a diagram illustrating a current collector according to another embodiment of the present disclosure.

[0038] Fig. 9 is a diagram illustrating a current collector according to another embodiment of the present disclosure.

[0039] Fig.10 is a diagram illustrating a current collector according to another embodiment of the present disclosure.

[0040] Fig.11 is a diagram illustrating a current collector according to another embodiment of the present disclosure.

[0041] Fig.12 is a diagram illustrating a current collector according to another embodiment of the present disclosure.

[0042] Fig.13 is a diagram illustrating a current collector according to another embodiment of the present disclosure.

[0043] Fig.14 It is an example Fig.13 A diagram showing a state in which the current collector is stretched.

[0044] Fig.15 is a diagram illustrating a state after gas discharge occurs in a battery cell according to an embodiment of the present disclosure.

[0045] Fig.16 This is an example of what is observed from the outside. Fig.15 Diagram of a battery cell in .

[0046] Fig.17 is a diagram illustrating a battery cell according to another embodiment of the present disclosure.

[0047] Fig.18 is a diagram illustrating a battery cell according to another embodiment of the present disclosure.

[0048] Fig.19 is a diagram illustrating a battery pack including a battery cell according to an embodiment of the present disclosure.

[0049] Fig. 20 It is an example including Fig.19 Diagram of a battery pack in a vehicle. DETAILED DESCRIPTION

[0050] Hereinafter, the 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 and dictionary meanings, but should be interpreted based on the meanings and concepts corresponding to the technical aspects of the present disclosure on the basis of the principle that the inventor is allowed to appropriately define the terms for the best interpretation. Therefore, the configurations proposed in the embodiments of this specification and the accompanying drawings only represent the most preferred embodiments of the present disclosure, and do not represent all technical concepts of the present disclosure, so it should be understood that various equivalents and modifications may be made to them when filing an application.

[0051] Furthermore, to aid understanding of the present disclosure, the drawings are not drawn to scale and the sizes of some elements may be exaggerated. In addition, the same reference numerals may represent the same components between different embodiments.

[0052] Referring to two objects being compared as being the same means that they are "substantially the same." Thus, "substantially the same" can include situations where the deviation is considered low in the art (e.g., less than 5%). In addition, a parameter that is uniform in a region can mean that it is uniform from an average perspective.

[0053] Although "first", "second", etc. are used to describe various elements, these elements are not limited to these terms. These terms are only used to distinguish one element from another element, and unless otherwise mentioned, the first element may also be the second element.

[0054] Throughout the specification, unless otherwise mentioned, various elements may include a single element or a plurality of elements.

[0055] The configuration of setting an element "in the upper part (or lower part)" or "at the top (or bottom)" of a target element may mean that the element may be set to contact the upper surface (or lower surface) of the target element, and another element may be inserted between the target element and the element set on the top (or bottom) of the target element.

[0056] Furthermore, the expression “an element is ‘connected’, ‘coupled’ or ‘fastened’ to another element” should be understood that the elements may be directly connected or fastened to each other, another element may be “interposed” between the elements, or the elements may be “connected”, “coupled” or “fastened” through other elements.

[0057] Throughout the specification, unless otherwise mentioned, “A and / or B” may mean A or B, or A and B, and “C to D” may mean “equal to or greater than C and equal to or less than D” unless otherwise mentioned.

[0058] For convenience of explanation, in this specification, the longitudinal direction of the winding axis of the electrode assembly 10 wound in a winding core shape is referred to as the “axial direction (Y)”. In addition, the direction around the winding axis is referred to as the “circumferential direction (X)”.

[0059] In addition, the direction close to or away from the winding axis is called the "radial direction".

[0060] The direction away from the winding axis is called the "centripetal direction".

[0061] Figure 1 is a diagram illustrating a battery cell 1 according to an embodiment of the present disclosure, and Figure 2 yes Figure 1 Longitudinal cross-sectional view of . Figure 3 yes Figure 1 A longitudinal cross-sectional view of a battery cell 1 in FIG.

[0062] Reference Figure 1 , the battery cell 1 according to the embodiment of the present disclosure includes an electrode assembly 10, a battery case 20, a current collector 30 and a case cover 40. In addition, the battery cell 1 may further include an insulator S and / or a terminal 50 and / or a sealing gasket G1 and / or an insulating gasket G2 and / or a second current collector 60 and / or an insulator 70. The present disclosure is not limited to a specific type of battery and may be applied to other types of batteries (such as square batteries).

[0063] The electrode assembly 10 includes a first uncoated portion 11 and a second uncoated portion 12. More specifically, the electrode assembly 10 has a structure in which the first electrode and the second electrode are wound around a winding axis while a separator is interposed between the first electrode and the second electrode, thereby defining a core and a peripheral surface. That is, the electrode assembly 10 applied to the present disclosure may be a core-wound electrode assembly 10. In this case, an additional separator may be provided on the peripheral surface of the electrode assembly 10 to insulate it from the battery case 20. The electrode assembly 10 may have a winding structure known in the art without limitation.

[0064] The first electrode includes a first electrode current collector and a first electrode active material coated on one side or both sides of the first electrode current collector. Figure 1 An uncoated portion not coated with the first electrode active material is provided at one end of the battery cell 1 (in a direction parallel to the height direction of the battery cell 1 shown). That is, the first electrode includes an uncoated portion that is not coated with the active material at the end of its long side along the winding direction and is exposed to the outside of the separator. Hereinafter, the uncoated portion used as the first electrode tab will be referred to as the first uncoated portion 11. The first uncoated portion 11 is provided at the electrode assembly 10 accommodated in the battery case 20 in the height direction (in a direction parallel to the height direction of the battery cell 1 shown). Figure 1 The first electrode 1 is formed by a first uncoated portion 11, which is not coated with an active material at the end of the long side and is exposed to the outside of the separator, and at least a portion of the first uncoated portion 11 itself serves as an electrode terminal. The first uncoated portion 11 can be, for example, a negative electrode terminal.

[0065] In addition, at least a portion of the first non-coating portion 11 may include a plurality of sections divided along the winding direction of the electrode assembly 10. In this case, the plurality of sections may be bent in the radial direction of the electrode assembly 10.

[0066] Reference Figure 2 and Figure 3 , multiple bending sections of the first uncoated portion 11 may overlap in multiple layers to form a bending surface. In this case, the joint connection portion 32 (described later) of the current collector 30 may be connected to the bending surface. The joint connection portion 32 may be connected to an area where multiple sections overlap in multiple layers. In this case, the joint connection portion 32 may be placed on the bending surface of the first uncoated portion 11, and welding may be performed on a certain area thereof. That is, the joint connection portion 32 may be connected to an area where multiple sections of the first uncoated portion 11 overlap in multiple layers. For example, as Figure 5 As shown, the joint coupling portion 32 may have at least one welding portion TW that is welded to a certain area while being seated on the bent surface of the first non-coating portion 11 .

[0067] The second electrode includes a second electrode current collector and a second electrode active material coated on one side or both sides of the second electrode current collector. Figure 1 At the other end of the battery cell 1 shown in the figure (in a direction parallel to the height direction of the battery cell 1), an uncoated portion not coated with the second electrode active material is provided. That is, the second electrode includes an uncoated portion, which is not coated with an active material at the end of the long side along the winding direction and is exposed to the outside of the diaphragm. Hereinafter, the uncoated portion used as the second electrode connector will be referred to as the second uncoated portion 12. The second uncoated portion 12 is provided at the bottom of the electrode assembly 10 accommodated in the battery case 20 in its height direction. That is, the second electrode includes a second uncoated portion 12, which is not coated with an active material at the end of the long side and is exposed to the outside of the diaphragm, and at least a portion of the second uncoated portion 12 itself is used as an electrode connector. The second uncoated portion 12 can be, for example, a positive electrode connector.

[0068] Furthermore, in the present disclosure, any active material known in the art may be used without limitation as the positive electrode active material coated on the positive electrode plate and the negative electrode active material coated on the negative electrode plate.

[0069] Reference Figure 1 The battery case 20 is a substantially cylindrical container having an opening formed on one side thereof, and is made of a conductive metal material. Typically, the side surface of the battery case 20 and the bottom surface opposite to the opening are formed integrally. That is, the battery case 20 is typically configured so that the top in the height direction is open and the bottom is closed. The bottom surface of the battery case 20 may be configured in a substantially flat shape. The battery case 20 receives the electrode assembly 10 through an opening formed on one side in the height direction. The battery case 20 may also receive an electrolyte through the opening.

[0070] The battery case 20 may have a press-edge portion 21 formed at an end adjacent to an opening provided at the top of the battery case 20. The battery case 20 may further include a curling portion 22 formed on the press-edge portion 21. The press-edge portion 21 may be configured so that the outer peripheral surface of the battery case 20 is press-fitted to a predetermined depth. More specifically, the press-edge portion 21 may be configured to be press-fitted inwardly in a region between an opening formed on one side of the battery case 20 and a receiving portion that receives the electrode assembly 10.

[0071] The beading portion 21 is formed above the electrode assembly 10. The inner diameter of the battery case 20 in the region where the beading portion 21 is formed is smaller than the diameter of the electrode assembly 10. At least one joint coupling portion 32 of the current collector 30 to be described later may be positioned lower than the beading portion 21.

[0072] The edge pressing portion 21 provides a support surface on which the case cover 40 is placed. In addition, the edge pressing portion 21 may be provided with a support surface on which at least a portion of the edge of the current collector 30 to be described later is placed and connected. That is, at least a portion of the edge of the current collector 30 and / or the edge of the case cover 40 of the present disclosure may be placed on the upper surface of the edge pressing portion 21. In order to stably support at least a portion of the edge of the current collector 30 and / or the edge of the case cover 40, the upper surface of the edge pressing portion 21 may be configured to extend in a direction substantially parallel to the bottom surface of the battery case 20, that is, in a direction substantially perpendicular to the side wall of the battery case 20.

[0073] The edge clamping portion 21 may prevent the electrode assembly 10 (whose size roughly corresponds to the inner diameter of the battery case 20) from escaping through the opening formed at the top of the battery case 20, and serves as a support portion on which the case cover 40 is placed. The upper edge clamping portion 21 may function as a support portion for fixing the contact portion 33a of the current collector 30 and the sealing gasket G1 and the case cover 40.

[0074] The beading portion 22 is formed on the top of the beading portion 21. The beading portion 22 is configured to extend and bend to surround the edge of the housing cover 40 disposed above the beading portion 21. Such a configuration of the beading portion 22 can fix the housing cover 40 to the beading portion 21.

[0075] Next, we will refer to Figures 1 to 14 The current collector 30 according to the embodiment of the present disclosure is described in detail by comparing the current collector 30 according to the embodiment of the present disclosure with a conventional current collector.

[0076] First, refer to Figure 1 and Figure 2 The current collector 30 according to an embodiment of the present disclosure is accommodated inside the battery case 20 and is electrically connected to the electrode assembly 10 and the battery case 20. That is, the current collector 30 electrically connects the electrode assembly 10 and the battery case 20.

[0077] Figure 4 is a diagram illustrating a current collector 30 according to an embodiment of the present disclosure.

[0078] Reference Figure 4 The current collector 30 includes a support portion 31 located on one surface of the electrode assembly 10, a plurality of joint coupling portions 32 extending from the support portion 31 and coupled to the first uncoated portion 11, and a plurality of case coupling portions 33 extending from the support portion 31 and coupled to the inner surface of the battery case 20.

[0079] The joint coupling portion 32 and the case coupling portion 33 are indirectly connected to each other through the support portion 31, rather than being directly connected to each other. Therefore, when an external impact is applied to the battery cell 1 of the present disclosure, the possibility of damage to the coupling portion between the current collector 30 and the electrode assembly 10 and the coupling portion between the current collector 30 and the battery case 20 can be minimized.

[0080] Reference Figure 4 , at least one joint connection part 32 and / or at least one housing connection part 33 may be provided.

[0081] At least one joint coupling portion 32 and at least one case coupling portion 33 may be disposed in, for example, a substantially radial shape, a cross shape, or a combination thereof relative to the center of the current collector 30 . On the other hand, respective case coupling portions 33 may be disposed between adjacent joint coupling portions 32 .

[0082] Reference Figure 3, a support portion 31 and a plurality of joint coupling portions 32 are disposed on the top of the electrode assembly 10. The joint coupling portion 32 is coupled to the first uncoated portion 11 of the electrode assembly 10. The joint coupling portion 32 may be coupled to the first uncoated portion 11 in the radial direction of the electrode assembly 10 by, for example, welding. For example, the joint coupling portion 32 may be welded to the first uncoated portion 11 to be substantially parallel to the bottom surface of the battery case 20. Referring to Figure 4 , the welding portion TW formed between the first non-coating portion 11 and the joint coupling portion 32 may form a straight welding pattern extending substantially in, for example, a radial direction of the electrode assembly 10 .

[0083] In addition, the support portion 31 and the joint connection portion 32 may also be connected to the first uncoated portion 11. The joint connection portion 32 and the first uncoated portion 11 may be connected by welding. In the case where the edge pressing portion 21 is formed in the battery case 20, the support portion 31 and the joint connection portion 32 are positioned lower than the edge pressing portion 21.

[0084] The support portion 31 may include a hole H2 of the current collector 30 formed at a position corresponding to the winding hole H1 formed substantially at the center of the electrode assembly 10. The winding hole H1 and the hole H2 of the current collector 30, which are connected to each other, may be used as a passage for inserting a welding rod or irradiating a laser beam for welding between the terminal 50 and the second current collector 60 (to be described later) or for welding between the terminal 50 and a lead tap (not shown). The diameter of the hole H2 of the current collector 30 is substantially equal to or greater than the diameter of the winding hole H1 of the electrode assembly 10 so as not to cover the winding hole H1 formed in the core of the electrode assembly 10. If the diameter of the hole H2 of the current collector 30 is much smaller than the diameter of the winding hole H1, the winding hole H1 may be blocked, reducing the liquid injection performance and making it difficult to ensure sufficient space for inserting a welding device or irradiating a laser beam.

[0085] The plurality of joint coupling portions 32 may extend substantially radially from the support portion 31 of the current collector 30 toward the sidewall of the battery case 20. The respective joint coupling portions 32 may be positioned to be spaced apart from each other along the circumferential direction of the support portion 31.

[0086] The plurality of case coupling portions 33 may extend substantially radially from the support portion 31 of the current collector 30 toward the sidewall of the battery case 20. The respective case coupling portions 33 may be positioned to be spaced apart from each other along the circumferential direction of the support portion 31.

[0087] At least one housing coupling portion 33 may be located between adjacent joint coupling portions 32 .

[0088] The case coupling portion 33 may extend from the support portion 31 to be electrically coupled to an inner surface of the battery case 20 .

[0089] For example, the case coupling portion 33 may be coupled to, for example, the bead pressing portion 21 on the inner surface of the battery case 20. In particular, the case coupling portion 33 may be coupled to the upper surface of the bead pressing portion 21.

[0090] In the case where the above structure is applied to the battery cell 1 of the present disclosure, the electrode assembly 10 coupled with the current collector 30 may be received inside the battery case 20 so that the case coupling portion 33 may be seated on the edge pressing portion 21. Therefore, the welding process of the battery case 20 and the current collector 30 may be easily performed. Figure 6 It can be seen that at least one welding portion BW may be provided between the edge holding portion 21 and the shell coupling portion 33. That is, the current collector 30 may include at least one welding portion BW to be welded to the inner surface of the battery case 20. For example, laser welding, ultrasonic welding, or spot welding may be applied as welding between the battery case 20 and the current collector 30. In addition, the upper surface of the edge holding portion 21 may be configured to extend in a direction substantially parallel to the bottom surface of the battery case 20 (i.e., in a direction substantially perpendicular to the side wall of the battery case 20), and the shell coupling portion 33 may also be configured to extend in the same direction (i.e., in the radial direction and the circumferential direction), so that the shell coupling portion 33 may be in stable contact with the edge holding portion 21. In addition, since the shell coupling portion 33 is in stable contact with the edge holding portion 21 as described above, it is possible to effectively perform welding between the two components, thereby improving the bonding force between the two components and minimizing the increase in resistance of the coupling portion.

[0091] Reference Figure 3 and Figure 4 The housing coupling portion 33 includes: a contact portion 33a coupled to the inner surface of the battery housing 20, and a connecting portion 33b connecting the support portion 31 and the contact portion 33a. In one aspect of the present disclosure, the joint coupling portion 32 may have a greater width than the connecting portion 33b. In another aspect of the present disclosure, the contact portion 33a may have a greater width than the connecting portion 33b.

[0092] The contact portion 33a is coupled to the inner surface of the battery case 20. In the case where the edge pressing portion 21 is formed in the battery case 20, the contact portion 33a may be coupled to the edge pressing portion 21 as described above. In this case, in order to stabilize the contact and coupling, both the edge pressing portion 21 and the contact portion 33a may be configured to extend in a direction substantially parallel to the bottom surface of the battery case 20 (i.e., in a direction substantially perpendicular to the side wall of the battery case 20).

[0093] Meanwhile, the contact portion 33a may be welded to the upper surface of the bead holding portion 21. That is, the welding portion BW may be formed on the upper surface area of ​​the bead holding portion 21. The welding portion BW formed between the contact portion 33a and the bead holding portion 21 may be formed narrower than the upper surface of the bead holding portion 21.

[0094] At least a portion of the contact portion 33a may be formed into an arc shape extending in the circumferential direction along the edge pressing portion 21 of the battery housing 20. Therefore, the circumferential extension length of the contact portion 33a may be formed to be greater than the width of the connecting portion 33b. In this case, in order to maximize the contact area, the current collector 30 may be configured so that the sum of the circumferential extension lengths of the respective contact portions 33a of the plurality of housing coupling portions 33 is substantially equal to or slightly less than the inner circumference of the battery housing 20. On the other hand, the contact portion 33a may have an arc shape extending in opposite directions along its circumferential direction on the edge pressing portion 21 from the intersection of the connecting portion 33b and the contact portion 33a.

[0095] Reference Figure 4 , the current collector 30 of the present disclosure may have at least one injection hole H3. For example, the injection hole H3 may be provided in the joint connection part 32. In the case where a plurality of joint connection parts 32 are provided, the injection hole H3 may be provided in at least one joint connection part 32. For example, the injection hole H3 may be provided on one side or both sides of at least one welding part TW formed on the joint connection part 32. Figure 3 and Figure 4 , when manufacturing the battery cell 1 according to an embodiment of the present disclosure, the assembly including the electrode assembly 10 and the current collector 30 can be received inside the battery case 20, and then the electrolyte can be injected. At this time, the injection hole H3 can improve the liquid injection capacity. A plurality of injection holes H3 can be inserted in one joint connection portion 32. The plurality of injection holes H3 can be arranged to be roughly symmetrical with respect to the center of the joint connection portion 32 in the width direction. In this way, a welding portion TW for connecting the joint connection portion 32 and the first uncoated portion 11 can be formed between the injection holes H3 arranged to be roughly symmetrical in the left-right direction.

[0096] Reference Figure 4, the distance A from the center of the current collector 30 to the end of the joint connection part 32 may be substantially equal to or less than the distance B from the center of the winding hole H1 of the electrode assembly 10 to the innermost of the edge pressing part 21 formed on the battery case 20. In this case, the edge pressing part 21 can be prevented from interfering with the current collector 30 during the sizing process, thereby preventing the edge pressing part 21 from squeezing the current collector 30 and damaging the current collector 30 and / or the electrode assembly 10. In addition, as described later, when exhaust gas is generated inside the battery cell 1, the current collector 30 may be separated upward due to the exhaust gas. At this time, in order to effectively separate the current collector 30 from the top of the battery cell 1, the distance A from the center of the current collector 30 to the end of the joint connection part 32 must be substantially equal to or less than the distance B from the center of the winding hole H1 of the electrode assembly 10 to the innermost of the edge pressing part 21 formed on the battery case 20. That is, according to this structure, the upward movement distance of the current collector 30 can be maximized.

[0097] Reference Figure 4 At least one or more welding portions TW may be provided in each joint coupling portion 32 . The welding portions TW may be formed in the support portion 31 of the current collector 30 , and in the joint coupling portion 32 .

[0098] As described above, the edge holding portion 21 may have a flat portion disposed thereon. At least one or more welding portions BW may be formed between the edge holding portion 21 and the contact portion 33a. At least one welding portion BW may form a straight welding pattern extending substantially in the circumferential direction on the edge holding portion 21. Alternatively, in another embodiment of the present disclosure, at least one welding portion BW formed between the edge holding portion 21 and the contact portion 33a may form an arc-shaped welding pattern extending substantially in the circumferential direction on the edge holding portion 21. The welding portion BW formed on the contact portion 33a may extend in the circumferential direction.

[0099] In one aspect of the present disclosure, the total number of welding portions BW formed on the contact portion 33a may be less than or equal to the number of the joint coupling portions 32. Figures 4 to 6 The number of welding portions BW formed on the contact portion 33a is described in detail.

[0100] Figure 5 is a diagram illustrating a conventional current collector 30 as a comparative example of the present disclosure, and Figure 6 is a diagram illustrating a current collector 30 according to an embodiment of the present disclosure.

[0101] Reference Figure 5, the conventional current collector 30 is configured so that the number of welding portions BW formed on the contact portion 33a is greater than the number of joint coupling portions 32. As a result, the bonding force between the battery case 20 and the current collector 30 can be improved. However, in this case, when gas discharge occurs inside the battery cell 1, the current collector 30 cannot be effectively separated due to the strong bonding force between the battery case 20 and the current collector 30. That is, since the case coupling portion 33 of the current collector 30 is strongly coupled to the edge pressing portion 21 of the battery case 20, there is a limitation on the increase in the upward movement distance of the current collector 30.

[0102] On the other hand, referring to the current collector 30 according to the embodiment of the present disclosure, Figure 6 , the number of welding portions BW formed on the contact portion 33a may be the same as the number of the joint coupling portions 32. That is, according to the present disclosure, the number of welding portions BW is reduced compared to the conventional current collector 30. For example, Figure 6 As shown, there may be a total of four welding portions BW, so that one welding portion BW is provided on each contact portion 33a. In addition, there may be four joint coupling portions 32.

[0103] Figure 7 is a diagram illustrating a current collector 30 according to another embodiment of the present disclosure.

[0104] Reference Figure 7 , the number of welding portions BW formed on the contact portion 33a may be configured to be less than the number of joint coupling portions 32. For example, Figure 7 It is shown that a total of two welding portions BW are provided on the contact portion 33a. In addition, four joint coupling portions 32 may be provided.

[0105] In this way, according to the structure in which the number of welding parts BW formed on the contact part 33a is less than or equal to the number of joint coupling parts 32, the bonding force between the housing coupling part 33 and the battery housing 20 can be reduced. Therefore, in the case of exhausting gas from the battery cell 1, the current collector 30 can be more easily deformed upward. That is, in the case of exhausting gas from the battery cell 1, the upward movement distance of the current collector 30 can be further increased. For example, since the bonding force between the contact part 33a and the edge pressing part 21 is reduced, the contact part 33a welded to the edge pressing part 21 can be separated due to the exhaust gas ejected upward. At the same time, the welding bond between the current collector 30 and the first uncoated part 11 welded to the current collector 30 can be released. Therefore, the current collector 30 can be deformed and bent upward, thereby moving upward. Therefore, the current collector 30 can be effectively separated from the first uncoated part 11. Therefore, the fuse characteristics inside the battery cell 1 can be enhanced.

[0106] also, Figure 6 and Figure 7 Only one embodiment of the present disclosure is presented, and the number of welding portions BW and the number of joint coupling portions 32 are not limited to Figure 6 or Figure 7 Quantity shown.

[0107] In addition, even if the number of welding portions BW is relatively small, the case coupling portion 33 coupled to the edge pressing portion 21 can maintain a certain degree of resistance. On the other hand, if the number of welding portions TW between the first uncoated portion 11 and the joint coupling portion 32 is reduced, the internal resistance of the battery cell 1 is significantly increased, and the degree of resistance dispersion is seriously increased, so the process of reducing the number of welding portions TW between the first uncoated portion 11 and the joint coupling portion 32 is not desirable. Therefore, it is desirable to ensure the fusing characteristics by reducing the number of welding portions BW between the inner surface of the battery case 20 and the case coupling portion 33.

[0108] Figures 8 to 13 is a diagram illustrating a current collector 30 according to another embodiment of the present disclosure, and Fig.14 It is an example Fig.13 FIG. 4 is a diagram showing a state in which the current collector 30 is stretched.

[0109] Because according to Figures 8 to 14 The current collector 30 is similar to the current collector 30 in the previous embodiment, and thus redundant descriptions of elements substantially the same as or similar to those in the previous embodiment will be omitted, and the following description will be based on differences from the previous embodiment.

[0110] In another aspect of the present disclosure, the number of the housing coupling portions 33 may be configured to be smaller than the number of the joint coupling portions 32 .

[0111] For example, refer to Figure 8 , the number of the housing coupling parts 33 may be configured to be smaller than the number of the joint coupling parts 32 . Figure 8 It is shown that two housing coupling parts 33 are provided. In addition, four joint coupling parts 32 may be provided.

[0112] According to the structure in which the number of the shell coupling parts 33 is less than the number of the joint coupling parts 32 as described above, the bonding force between the shell coupling parts 33 and the battery case 20 can be reduced. Therefore, in the case of exhausting gas from the battery cell 1, the current collector 30 can be more easily deformed upward. That is, in the case of exhausting gas from the battery cell 1, the upward movement distance of the current collector 30 can be further increased. As described above, when the current collector 30 is turned over and deformed upward, the welding bond between the current collector 30 and the first uncoated portion 11 welded to the current collector 30 can be easily released. Therefore, the current collector 30 can be effectively separated from the first uncoated portion 11. As a result, inside the battery cell 1, the fusing characteristics can be enhanced.

[0113] also, Figure 8 Only one embodiment of the present disclosure is illustrated, and the number of the housing coupling parts 33 and the number of the joint coupling parts 32 are not limited to Figure 8 However, it is desirable that the current collector 30 has a symmetrical shape with respect to a straight line passing through the center of the current collector 30. For example, in Figure 8 In the case where two shell coupling parts 33 are provided as shown, it is preferred that they are configured to be symmetrical with respect to each other so that each shell coupling part 33 is arranged on both sides of a straight line passing through the center of the current collector 30. Alternatively, in another embodiment, three shell coupling parts 33 and three joint coupling parts 32 may be configured. Also in this case, they are preferably configured to be symmetrical with respect to a straight line passing through the center of the current collector 30. Therefore, in this embodiment, three shell coupling parts 33 may be formed at 120 degrees between the corresponding shell coupling parts 33, and three joint coupling parts 32 may be formed at 120 degrees between the corresponding joint coupling parts 32.

[0114] In another aspect of the present disclosure, the connection portion 33 b and the contact portion 33 a may be configured to have substantially the same width along the extending direction.

[0115] For example, refer to Fig. 9 , the width of the connecting portion 33b and the contact portion 33a are substantially the same. According to this structure, the width becomes larger than Figure 6The width of the connecting portion 33b of the current collector 30 shown in the figure is narrower. That is, since the area of ​​the contact portion 33a connected to the edge pressing portion 21 is reduced, the bonding force between the contact portion 33a and the edge pressing portion 21 is also reduced. Therefore, the bonding force between the shell connecting portion 33 and the battery shell 20 can be reduced. Therefore, when gas discharge occurs in the battery cell 1, the current collector 30 can be more easily deformed upward. That is, in the case of gas discharge from the battery cell 1, the upward movement distance of the current collector 30 can be further increased. That is, the current collector 30 can be effectively separated from the electrode assembly 10. Therefore, inside the battery cell 1, the fusing characteristics can be enhanced.

[0116] Referring to another embodiment of the present disclosure Fig.10 , the connection portion 33b and the contact portion 33a can be configured to have substantially the same width along the extension direction, and can also be configured so that the number of welding portions BW formed on the contact portion 33a is smaller than the number of joint coupling portions 32. According to this structure, Fig. 9 Compared with the current collector 30 in the embodiment of the present invention, the bonding force between the case coupling portion 33 and the battery case 20 can be further reduced. Therefore, the fusing property can be further enhanced.

[0117] In another aspect of the present disclosure, a break portion NL may be provided at the boundary between the support portion 31 and the housing coupling portion 33, which is configured to have a lower strength than the surrounding area. That is, the break portion NL may be configured to be structurally more fragile than the surrounding area. For example, the break portion NL may be configured to have a thickness thinner than that of the surrounding area. Alternatively, the break portion NL may be configured to have a lower density than the surrounding area.

[0118] Reference Fig.11 , the breaking portion NL may be disposed at the boundary between the supporting portion 31 and the shell coupling portion 33. For example, the breaking portion NL may be configured in the form of a notch-forming line including a plurality of notches. That is, the breaking portion NL may be configured in the shape of a substantially straight line. More specifically, the breaking portion NL may be disposed at the boundary between the supporting portion 31 and the connecting portion 33b. Although not shown in the drawings, in another embodiment, the breaking portion NL may also be disposed on the connecting portion 33b. Alternatively, the breaking portion NL may also be disposed at the boundary between the connecting portion 33b and the contact portion 33a.

[0119] According to the structure in which the breaking portion NL is provided at the boundary between the supporting portion 31 and the shell coupling portion 33 as described above, when the current collector 30 is deformed and bent upward when the gas is discharged from the battery cell 1, a strong pressure may be applied to the breaking portion NL, so that the breaking portion NL may be broken. Therefore, the supporting portion 31 of the current collector 30 can be separated from the shell coupling portion 33. At this time, the joint coupling portion 32 welded to the first uncoated portion 11 can also be separated from the shell coupling portion 33. That is, when gas discharge occurs, the breaking portion NL can be broken, so that the current collector 30 can be separated into a portion including the supporting portion 31 and the joint coupling portion 32 and another portion corresponding to the shell coupling portion 33. As a result, the fusing characteristics can be enhanced by the rupture of the breaking portion NL.

[0120] In addition, in this case, an insulator S described later may be interposed between the edge holding portion 21 and the electrode assembly 10. In this case, the insulator S may more thoroughly prevent the electrode assembly 10 and the battery case 20 from being electrically connected by the edge holding portion 21.

[0121] In another aspect of the present disclosure, a rupture portion NL configured to have lower strength than a surrounding area may be at a boundary between the support portion 31 and the joint coupling portion 32 .

[0122] For example, refer to Fig.12 The break portion NL may be provided at a boundary between the support portion 31 and the joint coupling portion 32 , and at a boundary between the support portion 31 and the housing coupling portion 33 .

[0123] According to this structure, when gas discharge occurs and the current collector 30 is deformed upward, a strong pressure can be applied to the fracture portion NL, causing the fracture portion NL to rupture, so that only the support portion 31 of the current collector can be separated from the surrounding area of ​​the support portion 31. Since the support portion 31 is used to indirectly connect the joint connection portion 32 and the shell connection portion 33, if the support portion 31 is separated from the current collector 30, the electrical connection between the joint connection portion 32 and the shell connection portion 33 can be interrupted. In addition, in this embodiment, since the fracture portion NL is provided along the periphery of the support portion 31, the support portion 31 is more likely to be broken during gas discharge. Therefore, the fusing characteristics can be further enhanced.

[0124] In another aspect of the present disclosure, the housing coupling portion 33 may be configured to be elongated in length.

[0125] Reference Fig.13 and 14That is, the housing coupling portion 33 is configured such that the length of the housing coupling portion 33 when the housing coupling portion 33 is extended is greater than the length when the housing coupling portion 33 is not extended. For example, at least a portion of the housing coupling portion 33 may be configured to have a rim shape with a hollow center. Specifically, the connection portion 33b of the housing coupling portion 33 may be configured to have a rim shape with a hollow center.

[0126] Here, the rim shape includes a circular shape, but is not necessarily limited to a circular shape. For example, the rim shape mentioned in the present disclosure may be a polygonal structure such as a triangle or a square, or may represent a specific shape with a curved edge. That is, the rim shape in the present disclosure includes all shapes with a hollow center and continuous edges.

[0127] For example, in an embodiment of the present disclosure, at least a portion of the housing coupling portion 33 may be configured to have an elliptical ring shape in a plan view, such as Fig.13 As shown. Specifically, the connecting portion 33b of the shell connecting portion 33 may have a planar shape of an elliptical ring. Here, by extending the connecting portion 33b, the major axis of the ellipse may be extended and the minor axis of the ellipse may be shortened. Alternatively, although not shown in the drawings, as another embodiment of the present disclosure, the shell connecting portion 33 may have a planar shape of a rhombus.

[0128] According to this structure, when the current collector 30 is assembled to the battery cell 1, the connection portion 33b can be easily extended. That is, the current collector 30 made of a single plate can be extended without wrinkles or damage without using a separate structure. Figure 3 , the support portion 31 of the current collector 30 is spaced apart from the contact portion 33a of the case coupling portion 33 of the current collector 30 by a predetermined distance in a direction toward the central axis of the battery cell 1. To do this, Fig.13 The current collector 30 having a planar shape must be deformed to be elongated in the vertical direction. For example, the boundary between the support portion 31 and the connection portion 33b and the boundary between the contact portion 33a of the connection portion 33b may be bent, respectively. In this case, in order to keep the radial length from the center of the current collector 30 to the end of the case connection portion 33 unchanged, the length of the connection portion 33b must be increased. Therefore, when Fig.14 When the housing coupling portion 33 is bent as shown, the elliptical ring shape can be deformed so that the housing coupling portion 33 can be elongated in its extending direction.

[0129] Reference Figures 1 to 3, the case cover 40 may have a vent portion 41, which is formed to prevent the internal pressure from increasing due to the gas generated inside the battery case 20. If the internal pressure of the battery case 20 increases above a certain level, the vent portion 41 may be configured to break. For example, the vent portion 41 may be formed in a portion of the case cover 40, and may be an area that is structurally more fragile than the surrounding area so as to be easily broken when internal pressure is applied. For example, the vent portion 41 may be an area having a smaller thickness than the surrounding area. Referring to Figure 1 and Figure 2 , the exhaust portion 41 can form an approximately circular closed ring.

[0130] In one aspect of the present disclosure, the radial length of the vent portion 41 may be configured to be greater than the radial length of the support portion 31. Preferably, the radial length of the vent portion 41 may be configured to be greater than the distance A from the center of the current collector 30 to the end of the joint coupling portion 32.

[0131] For example, refer to Figure 2 and Figure 3 , the distance from the center of the current collector 30 to the outermost point of the support portion 31 can be configured to be smaller than the distance from the center of the case cover 40 to the vent portion 41. According to this structure, when gas discharge occurs in the battery cell 1, the inner area of ​​the vent portion 41 can be separated so that the current collector 30 can be easily flipped to the outside of the battery cell 1. Preferably, if the radial length of the vent portion 41 is configured to be greater than the distance A from the center of the current collector 30 to the end of the joint connection portion 32, the current collector 30 can be more easily flipped to the outside of the battery cell 1. This will be referred to below Fig.15 and Fig.16 Describe in detail.

[0132] Fig.15 is a diagram illustrating a state after gas discharge occurs in the battery cell 1 according to an embodiment of the present disclosure, and Fig.16 This is an example of what is observed from the outside. Fig.15 Figure 1 shows a diagram of a battery cell 1 in FIG.

[0133] For some reasons, a thermal event may occur inside the battery cell 1, thereby generating exhaust gas, and the exhaust gas may increase the pressure inside the battery case 20. At this time, since the exhaust portion 41 corresponds to an area that is structurally more fragile than the surrounding area and is easily broken when the internal pressure of the battery cell 1 increases, a fracture may occur in the exhaust portion 41. Therefore, as Fig.15 and 16As shown in FIG. 1 , a portion of the housing cover 40 corresponding to the inner area of ​​the vent portion 41 may be torn upward. That is, when viewed from the top of the battery cell 1, the inner area of ​​the vent portion 41 may be open. Fig.15 and 16 As shown, a portion of the housing cover 40 corresponding to an outer region of the exhaust portion 41 may be bent upward by the high-pressure exhaust gas injected upward.

[0134] At this time, the current collector 30 may also be separated upward by the high-pressure exhaust gas ejected upward. That is, the welding portion TW between the current collector 30 and the first uncoated portion 11 may be broken. As a result, the current collector 30 may be Fig.15 and 16 Since the support portion 31 among the various parts of the current collector 30 has the largest moving distance, in order to make the support portion 31 easily move out of the battery cell 1, the separation area of ​​the housing cover 40 is preferably greater than or equal to the size of the support portion 31. That is, according to the structure of the present disclosure in which the radial length of the exhaust portion 41 is greater than or equal to the radial length of the support portion 31, the upward moving distance of the current collector 30 can be maximized.

[0135] At this time, according to the structure of the present disclosure in which the total number of welded portions BW formed on the contact portion 33a is less than or equal to the number of joint coupling portions 32, the bonding force between the case coupling portion 33 and the battery case 20 may be reduced. For example, the current collector 30 may be separated from the inner surface of the battery case 20. Specifically, the contact portion 33a may be Fig.15 The current collector 30 is separated from the upper surface of the edge pressing portion 21 in the direction of the arrow shown. Therefore, when gas discharge occurs in the battery cell 1, the current collector 30 can be more easily deformed upward. That is, when gas discharge occurs in the battery cell 1, the upward movement distance of the current collector 30 can be further increased.

[0136] Fig.17 is a diagram illustrating a battery cell 1 according to another embodiment of the present disclosure, and Fig.18 is a diagram illustrating a battery cell 1 according to another embodiment of the present disclosure.

[0137] In another aspect of the present disclosure, referring to Fig.17 , the battery cell 1 may include an insulator S interposed between the edge pressing portion 21 and the electrode assembly 10. The insulator S may include a material having an insulating property. The insulator S may have, for example, a strip shape or a sheet shape.

[0138] According to the structure in which the insulator S having insulating properties is inserted between the edge clamping portion 21 and the electrode assembly 10, even after the current collector 30 is separated, a situation in which the fusing operation is not completely performed due to the remaining contact portion 33a can be avoided. Fig.17 As shown) can block the formation of the current path.

[0139] Preferably, the insulator S may have a shape matching the inner surface of the edge pressing portion 21 .

[0140] For example, refer to Fig.18 , the insulator S may have a shape that is bent upward and extended toward the edge pressing portion 21. According to this structure, the contact between the first uncoated portion 11 and the battery case 20 can be completely blocked. That is, as the current collector 30 moves upward due to the pressure of the exhaust gas (such as Fig.18 As shown), the first uncoated portion 11 welded to the current collector 30 may also be deformed to bend upward. Therefore, the first uncoated portion 11 that bends upward is likely to contact the inner surface of the battery case 20. Specifically, since the edge pressing portion 21 has a structure that is recessed in the battery case 20, it is more likely to contact the first uncoated portion 11 that bends upward. That is, a current path can be formed through the contact between the first uncoated portion 11 and the battery case 20. However, according to the structure of the present disclosure in which the insulator S has a shape that matches the inner surface of the edge pressing portion 21, since the insulator S surrounds the inner surface of the edge pressing portion 21, the first uncoated portion 11 can be prevented from contacting the edge pressing portion 21. In other words, the formation of the current path can be reliably blocked.

[0141] Reference Figures 1 to 3 , the shell cover 40 covers the opening formed on one side of the battery shell 20. The shell cover 40 can be fixed by a curling portion 22 formed on the top of the battery shell 20. In this case, the sealing gasket G1 can be inserted between the battery shell 20 and the shell cover 40 and between the current collector 30 and the shell cover 40 to improve the fixing force and airtightness of the battery shell 20. In this case, the contact portion 33a and / or the second contact portion can be inserted between the edge pressing portion 21 of the battery shell 20 and the sealing gasket G1. The contact portion 33a and / or the second contact portion inserted between the edge pressing portion 21 and the sealing gasket G1 as described above can be fixed by bending the curling portion 22 extending upward from the edge pressing portion 21.

[0142] Reference Figure 3, the terminal 50 penetrates the battery case 20 on the opposite side of the opening of the battery case 20 and is electrically connected to the second uncoated portion 12 of the electrode assembly 10. The terminal 50 may substantially penetrate the center of the bottom surface of the battery case 20. For example, the terminal 50 may be coupled to the second current collector 60 coupled to the second uncoated portion 12 or a lead tap (not shown) coupled to the second uncoated portion 12, thereby being electrically connected to the electrode assembly 10. Therefore, the terminal 50 may have the same polarity as the second electrode of the electrode assembly 10 and may be used as the second electrode terminal T2. If the second uncoated portion 12 is a positive electrode tap, the terminal 50 may be used as a positive terminal.

[0143] Considering the polarity and function of the terminal 50, the terminal 50 must be insulated from the battery case 20 having the opposite polarity. To this end, an insulating pad G2 may be interposed between the terminal 50 and the battery case 20. Alternatively, a portion of the surface of the terminal 50 may be coated with an insulating material for insulation.

[0144] For the same reason, the second uncoated portion 12 and / or the second current collector 60 must be insulated from the battery case 20. To this end, the insulator 70 may be interposed between the second uncoated portion 12 and the battery case 20 and / or between the second current collector 60 and the battery case 20. In the case where the insulator 70 is applied, the terminal 50 may penetrate the insulator 70 to be electrically connected to the second uncoated portion 12.

[0145] In addition, in the present disclosure, the outer surface 20a of the closed portion located on the opposite side of the opening provided at the top of the battery case 20 can be used as the first electrode terminal T1. If the first uncoated portion 11 is a negative electrode tab, the first electrode terminal T1 can be a negative terminal. As described above, the battery cell 1 according to the present disclosure has a structure in which it is possible to use the terminal 50 exposed through the bottom surface located on the opposite side of the opening of the battery case 20 as the second electrode terminal T2, and it is possible to use the remaining area on the bottom surface of the battery case 20 except for the area occupied by the terminal 50 (including the area where the insulating pad G2 is exposed to the outside of the terminal 50 through the outer surface 20a of the closed portion) as the first electrode terminal T1. Therefore, the battery cell 1 according to the present disclosure can be connected to both the positive and negative electrodes in one direction when a plurality of battery cells 1 are electrically connected, thereby simplifying the electrical connection structure. In addition, the battery cell 1 according to the present disclosure has a structure in which it is possible to use most of the bottom surface located on the opposite side of the opening of the battery case 20 as an electrode terminal, and therefore has the advantage of ensuring sufficient area for welding components for electrical connection.

[0146] Reference Figure 2 and Figure 3, the second current collector 60 is coupled to the bottom of the electrode assembly 10 . The second current collector 60 is made of a conductive metal material, and is electrically coupled to the second non-coating portion 12 .

[0147] Reference Fig.19 The battery pack 3 according to the embodiment of the present disclosure includes a battery assembly in which a plurality of battery cells 1 according to the embodiment of the present disclosure are electrically connected as described above and a battery pack housing 2 for accommodating the battery assembly. For ease of explanation, components such as bus bars for electrical connection, cooling units, and power terminals are omitted from the drawings of the present disclosure.

[0148] Reference Fig. 20 The vehicle 5 according to the embodiment of the present disclosure may be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle, and includes the battery pack 3 according to the embodiment of the present disclosure. The vehicle 5 includes a four-wheel vehicle and a two-wheel vehicle. According to the embodiment of the present disclosure, the vehicle 5 is operated by receiving power from the battery pack 3.

[0149] As described above, although the present disclosure has been described with reference to limited embodiments and drawings, the present disclosure is not limited thereto, and those skilled in the art to which the present disclosure belongs may make various modifications and variations within the technical concept of the present disclosure and the equivalent scope of the appended claims.

[0150] [reference numerals list]

[0151] 5: Vehicles

[0152] 3: Battery Pack

[0153] 2: Battery pack housing

[0154] 1: Battery Cell

[0155] 10: Electrode assembly

[0156] 11: First uncoated portion

[0157] 12: Second uncoated portion

[0158] H1: Winding hole

[0159] 20: Battery housing

[0160] 20a: Outer surface of the closed part

[0161] T1: First electrode terminal

[0162] 21: Edge pressing part

[0163] 22: Curling part

[0164] 30: Current collector (first current collector)

[0165] H2: Holes of the current collector

[0166] 31: Support part

[0167] 32: Joint connection part

[0168] H3: injection hole

[0169] 33: Shell connection part

[0170] 33a: Contact part

[0171] 33b: Connection part

[0172] NL: Broken part

[0173] 40: Shell cover

[0174] 41: Exhaust part

[0175] G1: Sealing pad

[0176] S: Insulator

[0177] 50: terminal

[0178] T2: Second electrode terminal

[0179] G2: Insulation pad

[0180] 60: Second Episode of Fluid

[0181] N: Circuit breaker

[0182] 70: Insulator

Claims

1. A battery cell, comprising: An electrode assembly in which a first electrode and a second electrode are wound around a winding axis while a separator is interposed between the first electrode and the second electrode to define a core portion and an outer peripheral surface, the first electrode including a first uncoated portion not coated with an active material layer in a winding direction; a battery case having an opening provided on one side thereof and configured to accommodate the electrode assembly through the opening; a current collector comprising: a support portion disposed on an upper portion of the electrode assembly; a joint coupling portion extending from the support portion and coupled to the first uncoated portion; and a case coupling portion extending from the support portion to be electrically coupled to an inner surface of the battery case and comprising at least one welding portion welded to the inner surface of the battery case; and a housing cover configured to cover the opening, wherein the number of the welding parts is less than or equal to the number of the joint connection parts, or Wherein, a breaking portion configured to have a lower strength than a surrounding area is provided at a boundary between the support portion and the housing coupling portion.

2. The battery cell according to claim 1, in, The number of the housing coupling parts is smaller than the number of the joint coupling parts.

3. The battery cell according to claim 1, in, The housing connection portion comprises: a contact portion coupled to the inner surface of the battery case; and A connecting portion connects the supporting portion and the contact portion.

4. The battery cell according to claim 3, in, The connection portion and the contact portion have the same width in an extending direction.

5. The battery cell according to claim 1, in, The breaking portion is configured in the form of a notch-forming line including a plurality of notches.

6. The battery cell according to claim 1, in, A breaking portion configured to have a lower strength than the surrounding area is provided at a boundary between the supporting portion and the joint coupling portion.

7. The battery cell according to claim 1, in, The housing coupling portion is configured to be elongated in length.

8. The battery cell according to claim 1, in, At least a portion of the housing coupling portion has a rim shape with a hollow center.

9. The battery cell according to claim 1, in, The housing cover comprises: A vent portion is configured to rupture when an internal pressure of the battery case increases above a certain level.

10. The battery cell according to claim 9, in, The radial length of the exhaust portion is greater than the radial length of the support portion.

11. The battery cell according to claim 1, in, The battery housing comprises: A crimping portion is formed at an end portion adjacent to the opening and is press-fitted inwardly.

12. The battery cell according to claim 11, in, The battery unit comprises: An insulator is interposed between the edge pressing portion and the electrode assembly.

13. The battery cell according to claim 12, in, The insulator has a shape matching an inner surface of the pressing edge portion.

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

15. A vehicle comprising at least one battery pack according to claim 14.

Images