Battery cell

Abstract

The present invention relates to a battery cell comprising: a case including a case main body forming a receiving space, and at least one cap plate; an electrode assembly disposed in the receiving space; and a terminal assembly coupled to the at least one cap plate, wherein the terminal assembly comprises a current collection member electrically connected to the electrode assembly and having a through hole formed therein, and a terminal inserted into the through hole and contacting the current collection member.

Description

battery cell

[0001] The present disclosure relates to a battery cell, and more particularly to a battery cell including a terminal.

[0002] A battery cell may include an electrode assembly, a current collector connected to the electrode assembly, and a terminal connecting the current collector to an external device. The electrode assembly is a secondary battery that repeatedly performs charging and discharging.

[0003] Terminals and current collectors can be joined by welding. Typically, line or spot welding is used. However, the unwelded or non-welded portion has a relatively high electrical resistance compared to the welded portion, making the electrical connection vulnerable. In this case, current flow is concentrated in the welded portion, which has relatively low electrical resistance, and this can lead to concentrated heat generation at the welded portion. Consequently, the resulting thermal stress can cause the welded portion to become structurally vulnerable.

[0004] First, the present disclosure is intended to provide a battery cell with improved stability.

[0005] Second, the present disclosure is intended to increase the contact area between the current collector and the terminal.

[0006] Third, the present disclosure is intended to reduce electrical resistance between a current collector and a terminal and to reduce heat generation.

[0007] Fourth, the present disclosure is intended to mechanically connect a current collector and a terminal instead of using a conventional welding method.

[0008] Meanwhile, the battery cell according to the present disclosure can be widely applied in green technology fields such as electric vehicles, battery charging stations, energy storage systems (ESS), and other battery cell-using fields such as photovoltaics and wind power. In addition, the battery cell according to the present disclosure can be used in eco-friendly mobility, including electric vehicles and hybrid vehicles, to prevent climate change by suppressing air pollution and greenhouse gas emissions.

[0009] A battery cell according to the present disclosure comprises a case including a case body forming a receiving space and at least one cap plate; an electrode assembly disposed in the receiving space; and a terminal assembly coupled to the at least one cap plate. In addition, the terminal assembly comprises a current collecting member electrically connected to the electrode assembly and having a through hole formed therein; and a terminal inserted into the through hole and in contact with the current collecting member.

[0010] The terminal may include a terminal head that contacts the current collector; and a terminal pin that extends from the terminal head toward the cap plate and is inserted into the through hole.

[0011] Meanwhile, the terminal may further include a fixed pin disposed on the terminal head along the periphery of the terminal pin.

[0012] The above fixed pin may be provided spaced apart from the outside of the terminal pin so as to surround the terminal pin with the terminal pin as the center.

[0013] The above fixed pin may be arranged in an arc shape centered on the terminal pin when looking at the fixed pin from the cap plate.

[0014] The diameter of the above through hole may be equal to or larger than the diameter of the pin structure including the terminal pin and the fixed pin.

[0015] At least a portion of the terminal head may include a recessed portion positioned radially away from the terminal pin and recessed away from the cap plate.

[0016] The above-mentioned recessed portion may include a section in which the vertical length gradually increases toward the outside of the terminal head.

[0017] The above-described current collector member includes a through-hole periphery and a plate, and the through-hole periphery can contact the terminal head when the terminal pin and the fixing pin are inserted into the through-hole.

[0018] The terminal head further includes a recessed portion that is positioned radially away from the fixed pin and is concavely recessed in a direction away from the cap plate, with the terminal pin being centered thereon, and the periphery of the through hole can be positioned between the fixed pin and the recessed portion.

[0019] The above fixed pin can be bent outward so that the terminal pin and the fixed pin are bent when inserted into the through hole and come into contact with the upper portion of the periphery of the through hole.

[0020] The above fixed pin can be bent outward so as to contact the upper portion of the periphery of the through hole by compression of the pressing portion while the terminal pin is inserted into the hole of the pressing portion.

[0021] The diameter of the hole of the above pressurized portion may be smaller than the diameter of the pin structure including the terminal pin and the fixed pin, and may be equal to or larger than the diameter of the fixed pin.

[0022] The above terminal pin can be connected to the center portion of the above terminal head.

[0023] The terminal further includes a fixing pin connected to the center periphery of the terminal head, and when inserted into the through hole together with the terminal pin, the fixing pin can be bent to contact the upper surface of the current collecting member.

[0024] The terminal head may include a recessed portion connected to an outer end of the center periphery; and an outer connecting portion connected to an outer end of the recessed portion.

[0025] The vertical length of the above-mentioned recessed portion may be smaller than the vertical length of the above-mentioned outer connecting portion.

[0026] The diameter of the terminal head may be larger than the diameter of the through hole.

[0027] Meanwhile, a battery assembly according to one embodiment of the present disclosure may include the battery cell; and a receiving space including the battery cell.

[0028] First, according to an embodiment of the present disclosure, a battery cell with improved stability can be provided.

[0029] Second, according to the embodiment of the present disclosure, the electrical resistance of the terminal can be improved and the thermal behavior can be improved.

[0030] Third, according to an embodiment of the present disclosure, the terminal and the current collector member can be joined using a mechanical method instead of welding.

[0031] Fourth, according to the embodiment of the present disclosure, the manufacturing process of a battery cell can be simplified and the manufacturing cost can be reduced.

[0032] FIG. 1A is a drawing for explaining a battery cell according to one embodiment.

[0033] FIG. 1b is a drawing for explaining a terminal assembly according to one embodiment.

[0034] FIGS. 2A and 2B are drawings for explaining a current collector member and a terminal according to one embodiment.

[0035] FIGS. 3A to 3C are cross-sectional views illustrating the combination of a current collector member and a terminal according to one embodiment.

[0036] Figure 4 is a plan view of a terminal according to one embodiment.

[0037] The structural or functional descriptions of the embodiments disclosed in this specification or application are merely illustrative for the purpose of explaining embodiments according to the technical idea of ​​the present invention, and the embodiments according to the technical idea of ​​the present invention may be implemented in various forms other than the embodiments disclosed in this specification or application, and the technical idea of ​​the present invention is not construed as being limited to the embodiments described in this specification or application.

[0038] FIG. 1A is a drawing illustrating a battery cell according to one embodiment. FIG. 1B is a drawing illustrating a terminal assembly according to one embodiment. FIG. 1B illustrates a cross-section (S1) of the terminal assembly of FIG. 1A.

[0039] Referring to FIGS. 1A and 1B, according to one embodiment, a battery cell (100) includes a case (120) including a case body (121) forming a receiving space (not shown) and at least one cap plate (125), an electrode assembly (110) arranged in the receiving space, and a terminal assembly (130) coupled to the at least one cap plate (125). For example, the battery cell (100) may be a lithium ion battery, but is not limited thereto and may be modified into various types of batteries.

[0040] The electrode assembly (110) may include an electrode, a separator, and a lead tab (115). The electrode may include an anode and a cathode. The separator may be an insulator having electrical insulation properties. The lead tab (115) may include an anode lead tab and a cathode lead tab. The anode lead tab may be electrically connected to the anode, and the cathode lead tab may be electrically connected to the cathode. For example, the electrode assembly (110) may be a laminate in which electrodes (e.g., a cathode and an anode) are disposed on both sides of a separator, and the electrodes are wound with lead tabs connected to them.

[0041] The electrode assembly (110) may be placed in the receiving space of the case (120). The receiving space refers to a space formed inside the case (120). The electrode assembly (110) is positioned in the receiving space, and the case (120) may serve to protect the electrode assembly (110) from external shock and vibration. The electrode assembly (110) may further include an electrolyte. For example, the electrolyte may be a material that enables the movement of lithium ions. The electrolyte may be a liquid or solid material.

[0042] The case (120) may be a structure that forms an internal storage space. For example, the case (120) may have a shape such as a hexahedron or cylinder with an empty interior. The material of the case (120) may be aluminum or an aluminum alloy, but is not limited thereto and may be modified and implemented using various materials.

[0043] The case (120) may include a case body (121) and at least one cap plate (125). For example, the number of at least one cap plate (125) may be 1 or 2.

[0044] The case body (121) may form a receiving space with at least one open surface. For example, the at least one open surface may be an upper surface and / or a lower surface. After the electrode assembly (110) is placed in the receiving space, the open surface may be sealed by a cap plate (125) coupled to the case body (121).

[0045] Considering that the case body (121) accommodates the electrode assembly (110) together with the electrolyte, it is preferable that at least one open surface among the surfaces of the case body (121) be located at the top.

[0046] The cap plate (125) can be coupled to the case body (121). For example, after the electrode assembly (110) is placed in the receiving space inside the case body (121), it can be coupled to the case body (121) to seal the receiving space. At this time, the cap plate (125) can be coupled to the case body (121) using a coupling method such as a bolt, welding, clamp, or protrusion.

[0047] The cap plate (125) can be coupled to the terminal assembly (130). For example, a hole can be formed in the cap plate (125). The terminal assembly (130) can be inserted into the hole of the cap plate (125), thereby coupling the cap plate (125) to the terminal assembly (130).

[0048] In an embodiment, the case body (121) may form a receiving space with one open surface. For example, the open surface may be an upper surface. The electrode assembly (110) may be inserted through the upper surface and placed in the receiving space. In addition, one cap plate (125) may be coupled to the case body (121) to seal the open upper surface of the receiving space. In this case, two terminal assemblies (130) may be coupled to one cap plate (125).

[0049] In another embodiment, the case body (121) may form a receiving space with two open faces. For example, the two open faces may be an upper face and a lower face. The electrode assembly (110) may be inserted through the upper face or the lower face and placed in the receiving space. In addition, two cap plates (125) may be coupled to the case body (121) to seal the open upper face and the lower face of the receiving space. In this case, one terminal assembly (130) may be coupled to one cap plate (125).

[0050] The terminal assembly (130) can be coupled to the cap plate (125). The terminal assembly (130) is a structure for electrically connecting the electrode assembly (110) and an external device. The terminal assembly (130) can be divided into one of a first terminal assembly (130a) and a second terminal assembly (130b). Depending on the polarity of the lead tab (115) of the electrode assembly (110), one of the first terminal assembly (130a) and the second terminal assembly (130b) can be a positive terminal assembly, and the other can be a negative terminal assembly. In the same manner, the terminal (150) can be divided into one of a first terminal (150a) and a second terminal (150b), and one of the first terminal (150a) and the second terminal (150b) can be a positive terminal, and the other can be a negative terminal.

[0051] The terminal assembly (130) is electrically connected to the electrode assembly (110), and includes a current collecting member (140) having a through hole (145) formed therein, and a terminal (150) inserted into the through hole (145) to make contact with the current collecting member (140).

[0052] The current collector (140) can be electrically connected to the electrode assembly (110). For example, the current collector (140) can be electrically connected to the lead tab (115) by contacting the lead tab (115).

[0053] The terminal (150) can be electrically connected to the current collecting member (140). Specifically, the terminal (150) can be in contact with the current collecting member (140) and be directly electrically connected. Accordingly, the current collecting member (140) and the terminal (150) can be made of a conductive metal.

[0054] The terminal (150) can be electrically connected to an external device. The terminal (150) can be electrically connected to the electrode assembly (110) through the current collecting member (140). That is, the external device can be electrically connected to the electrode assembly (110) through the terminal (150) and the current collecting member (140). Here, the external device can be various devices such as another battery cell, a sensing device, and a battery management system.

[0055] In an embodiment, the terminal assembly (130) may further include a first insulator (161), an insulating socket (162), a second insulator (163), a rivet (164), a third insulator (165), a fourth insulator (166), a terminal plate (170), and a weld (180).

[0056] For example, the first insulator (161), the insulating socket (162), the second insulator (163), the third insulator (165), and the fourth insulator (166) may be structures having electrical insulation or high resistance properties. For example, the rivet (164), the terminal plate (170), and the weld (180) may be structures having electrical conductivity.

[0057] A first insulator (161) may be placed between the electrode assembly (110) and the terminal (150). A side end of the first insulator (161) may be placed between the lead tab (115) of the electrode assembly (110) and the current collector (140). The first insulator (161) may block a direct electrical connection between the lead tab (115) of the electrode assembly (110) and the terminal (150).

[0058] The insulating socket (162) is a structure for fixing the rivet (164). The insulating socket (162) and the second insulator (163) can block direct electrical connection between the lead tab (115) of the electrode assembly (110) and the cap plate (125).

[0059] The rivet (164) can secure the current collector member (140) and the terminal (150). For example, the rivet (164) can be inserted into the space between the outer side of the terminal pin of the terminal (150) and the inner side of the insulating socket (162) in the upper space of the current collector member (140).

[0060] The third insulator (165) can block a direct electrical connection between the rivet (164) and the cap plate (125). For example, the third insulator (165) can be placed between the rivet (164) and the cap plate (125). The fourth insulator (166) can block a direct electrical connection between the cap plate (125) and the terminal plate (170). For example, the fourth insulator (166) can be placed between the cap plate (125) and the terminal plate (170).

[0061] A weld (180) can be formed between the lead tab (115) and the current collector (140) through welding. The weld (180) can electrically connect the lead tab (115) and the current collector (140) to each other.

[0062] Hereinafter, the method and structure of connecting the current collector (140) to the terminal (150) will be described in detail with reference to the attached drawings.

[0063] FIG. 2A and FIG. 2B are drawings for explaining a current collector member and a terminal according to one embodiment. FIG. 2A shows a state before the current collector member and the terminal are coupled, and FIG. 2B shows a state when the current collector member and the terminal are coupled to each other.

[0064] Referring to FIGS. 2A and 2B, the current collecting member (140) may include a through hole (145) formed by penetrating the current collecting member (140). That is, the current collecting member (140) may include a through hole (145) penetrating the current collecting member (140) in a direction toward the cap plate (125). The through hole (145) is an area into which a terminal pin (155) of the terminal (150) is inserted, and may be an open area.

[0065] In an embodiment, the current collector (140) may include a plate (141) and a periphery of a through hole (143). The plate (141) may be an area that comes into contact with a terminal head (151) of a terminal (150). The periphery of the through hole (143) may be an area around a through hole (145).

[0066] For example, the periphery of the through hole (143) may be defined as an area within a reference distance from the through hole (145). The reference distance may be greater than the radius of the through hole (145). The shape of the through hole (145) may be the same as the shape of the terminal pin (155) of the terminal (150). For example, the shape of the through hole (145) may be circular, but this is only one embodiment and may be modified into various shapes.

[0067] The terminal (150) may include a terminal head (151), a terminal pin (155), and a fixing pin (159). The terminal head (151) may be connected to the terminal pin (155) and the fixing pin (159).

[0068] The terminal pin (155) may have a cylindrical shape extending from one side of the terminal head (151) toward the cap plate (125). Preferably, the terminal pin (155) may be connected to the center portion of the terminal head (151). In addition, the diameter of the terminal head (151) may be larger than the diameter of the terminal pin (155).

[0069] A fixed pin (159) may be connected to the center periphery of the terminal head (151). The center periphery of the terminal head (151) may be an area located outside the center portion where the terminal pin (155) is located, within a preset distance from the center of the center portion.

[0070] That is, the fixed pin (159) may be formed on the terminal head (151) in a form that surrounds the terminal pin (155). The vertical length of the fixed pin (159) may be smaller than the vertical length of the terminal pin (155). The vertical length may be the length in the z-axis direction.

[0071] The terminal (150) can be manufactured through various methods such as casting, forging, and extrusion. In an embodiment, the terminal head (151) and the terminal pin (155) can be formed integrally.

[0072] Preferably, the fixed pin (159) can also be manufactured as an integral part.

[0073] The terminal (150) and the current collector (140) can be mechanically contacted or joined.

[0074] In an embodiment, the terminal pin (155) of the terminal (150) may be inserted into the through hole (145) of the current collector (140) and the current collector (140) may be compressed and coupled to the terminal (150).

[0075] Specifically, referring to FIG. 2a, the current collecting member (140) can be aligned on the upper portion of the terminal (150) so that the terminal pin (155) and the fixed pin (159) of the terminal (150) are inserted into the through hole (145).

[0076] The fixed pin (159) may be provided spaced apart from the terminal pin (155) so as to surround the terminal pin (155) with the terminal pin (155) as the center.

[0077] The height of the fixed pin (159) based on the terminal head (151) will be lower than the height of the terminal pin (155). In addition, the height of the fixed pin (159) may be greater than the thickness of the current collecting member (140).

[0078] Meanwhile, the fixed pin (159) may be arranged in an arc shape with the terminal pin (155) as the center when looking at the fixed pin (159) from the cap plate (125). That is, the fixed pin (159) may not be connected continuously as one, but may be provided in multiple pieces so as to surround only a portion of the terminal pin (155).

[0079] Considering that the terminal pin (155) and the fixed pin (159) are inserted into the through hole (145), the diameter of the through hole (145) may be equal to or larger than the diameter of the pin structure including the terminal pin (155) and the fixed pin (159).

[0080] The through hole (145) may preferably be circular. This is for convenience of assembly and stress considerations. Similarly, the terminal pin (155) may also be provided in a cylindrical shape.

[0081] Referring to Fig. 2b, the current collecting member (140) can be compressed and moved downward. As a result, the current collecting member (140) can be brought into close contact with the terminal (150). Thereafter, the fixing pin (159) can be bent to fix the current collecting member (140) so that the current collecting member (140) does not separate from the terminal (150). This will be described in detail with reference to Figs. 3a to 3c.

[0082] Figures 3a to 3c are cross-sectional views illustrating the combination of a current collector and a terminal according to one embodiment. Figure 3a shows the state before the current collector and the terminal are combined, Figure 3b shows the state after the current collector and the terminal are combined, and Figure 3c shows the state in which the terminal's fixing pin is bent.

[0083] Referring to FIGS. 3A to 3C, the current collector (140) may include a plate (141), a through hole periphery (143), and a through hole (145). The terminal (150) may include a terminal head (151), a terminal pin (155), and a fixing pin (159).

[0084] In one embodiment, the terminal head (151) may include a center portion (152), a center peripheral portion (153a), a recessed portion (153b), and an outer connecting portion (154). In one embodiment, the terminal pin (155) may include a pin member (156) and a dog point (157).

[0085] The center portion (152) can be connected to the lower end of the pin member (156) of the terminal pin (155).

[0086] The center periphery (153a) can be connected to the outer end of the center portion (152). The center periphery (153a) can be connected to the lower end of the fixed pin (159).

[0087] The recessed portion (153b) may be connected to the outer end of the center periphery (153a). The outer connection portion (154) may be connected to the outer end of the recessed portion (153b). When the current collecting member (140) is compressed, the through-hole periphery (143) of the current collecting member (140) may be in contact with the recessed portion (153b), and the plate (141) of the current collecting member (140) may be in contact with the outer connection portion (154).

[0088] In one embodiment, the vertical length (y1) of the recessed portion (153b) may be smaller than the vertical length of the outer connecting portion (154). For example, the vertical length may be a length in the z-axis direction. That is, the vertical length of the outer connecting portion (154) may be a value obtained by adding the vertical length (y1) of the recessed portion (153b) to the reference length (y2).

[0089] In one embodiment, the recessed portion (153b) may include a section in which the vertical length gradually increases as it goes outward. Here, the outward direction may be a direction from the center portion (152) to the outer connection portion (154). For example, the recessed portion (153b) may include a section in which the vertical length increases by a reference length (y2) as it goes outward. Accordingly, when the current collecting member (140) is coupled to the terminal (150) by compression, a technical effect of preventing a gap from existing between the peripheral portion (143) of the through-hole and the recessed portion (153b) can be achieved.

[0090] The pin member (156) may be positioned at the top of the terminal head (151). For example, the lower end of the pin member (156) may be connected to the top of the center portion (152) of the terminal head (151).

[0091] The pin member (156) may be a portion inserted into the through hole (145). For example, the shape of the pin member (156) may be cylindrical. In this case, the vertical cross-sectional shape of the pin member (156) may be circular. Here, the vertical cross-sectional shape indicates the shape of the cross-section in the vertical direction. For example, the vertical direction may be the z-axis direction.

[0092] The dog point (157) may be positioned at the top of the pin member (156). For example, the lower end of the dog point (157) may be connected to the upper end of the pin member (156). The dog point (157) may protrude in the vertical direction so that its horizontal length becomes smaller. For example, the horizontal length may be a diameter. For example, the vertical direction may be the +z-axis direction. That is, the dog point (157) may have a horizontal length that becomes smaller from the bottom to the top. The dog point (157) may be a portion that is inserted into the through hole (145) before the pin member (156). The dog point (157) may function as a guide member that facilitates the insertion of the pin member (156).

[0093] The fixed pin (159) is a structure for fixing the current collector member (140).

[0094] The lower end of the fixed pin (159) may be connected to the upper end of the center periphery (153a) of the terminal head (151). In an embodiment, the inner end of the fixed pin (159) may be connected to the outer end of the pin member (156) of the terminal pin (155). However, this is only one embodiment, and the inner end of the fixed pin (159) may be modified and implemented so that it is not connected to the outer end of the pin member (156) of the terminal pin (155).

[0095] In an embodiment, the separation distance between the fixed pin (159) and the pin member (156) may increase in the upward direction. The upward direction may be the z-axis direction. For example, the separation distance may be the distance between the inner end of the fixed pin (159) and the outer end of the pin member (156). The separation distance may increase in the upward direction according to the separation angle (a1). The separation angle (a1) may be implemented by being modified to various values.

[0096] The fixed pin (159) can be bent by compression. That is, the shape of the fixed pin (159) can be changed by compression. The bent fixed pin (159) can be brought into contact with the upper end of the current collecting member (140).

[0097] In an embodiment, the diameter (w1) of the through hole (145) of the current collector (140) may be equal to or larger than the diameter (x2) of the pin structure of the terminal (150). Here, the pin structure may include a terminal pin (155) and a fixed pin (159). The diameter may be a length in the x-axis direction.

[0098] A pin structure including a terminal pin (155) and a fixed pin (159) can be inserted into the through hole (145).

[0099] In particular, FIGS. 3A and 3C only schematically illustrate the relative positions between the terminal (150), the current collector (140), and the cap plate (125). Referring to FIGS. 3A and 3C, it can be seen that the terminal (150) is inserted into the current collector (140) through the through hole (145) of the current collector (140) and extends toward the cap plate (125). Therefore, the terminal (150) can come into contact with the current collector (140). On the other hand, the terminal (150) can be arranged to be spaced apart from the hole provided in the cap plate (125).

[0100] In addition, after insertion, the terminal head (151) will come into contact with the lower surface of the current collecting member (140), and a portion including the free end of the fixed pin (159) will be bent to come into contact with the upper surface of the current collecting member (140). The upper surface of the current collecting member (140) means a surface of one side of the current collecting member (140) that faces the cap plate (125). Conversely, the lower surface of the current collecting member (140) means a surface located in the opposite direction to the upper surface of the current collecting member (140). That is, it means a surface that comes into contact with the terminal head (151).

[0101] Referring to FIGS. 3A and 3B, a current collector (140) or a terminal (150) may be aligned so that a through hole (145) is positioned on the pin structure. Thereafter, the pin structure may be inserted into the through hole (145). Here, the pin structure may include a terminal pin (155) and a fixing pin (159).

[0102] With the pin structure inserted into the through hole (145), the peripheral portion (143) of the through hole can be pressed so as to come into contact with the upper portion of the recessed portion (153b). Here, pressing is an act of applying high pressure using a press device, and the shape of the peripheral portion (143) of the through hole can be deformed by the pressing. For example, as shown in FIGS. 3a and 3b, the peripheral portion (143) of the through hole can be deformed so as to come into close contact with the recessed portion (153b).

[0103] Referring to FIGS. 3b and 3c, the fixed pin (159) can be bent by the pressing of the press device (300). The press device (300) can include a pressing portion (330) and a hole (350).

[0104] In one embodiment, the diameter (w2) of the hole (350) of the pressurizing portion (330) may be equal to or larger than the diameter of the fixed pin (159) and smaller than the diameter (x2) of the pin structure. The diameter of the fixed pin (159) may be a value that is a difference between the diameter (x2) of the pin structure and the diameter (x1) of the pin member (156). Accordingly, the fixed pin (159) may be pressed by the pressurizing portion (330).

[0105] In one embodiment, the fixed pin (159) may be bent to contact the upper end of the through-hole periphery (143) by the compression of the pressing member (330) while the terminal pin (155) is inserted into the hole (350) of the pressing member (330). Here, the outward direction may be a direction away from the pin member (156).

[0106] In this case, the periphery of the through hole (143) may be located between the fixed pin (159) and the recessed portion (153b).

[0107] Accordingly, the mechanical coupling between the current collecting member (140) and the terminal (150) can be improved. That is, the current collecting member (140) can be fixed by the fixing pin (159) so that the current collecting member (140) does not separate from the terminal (150). As a result, a state in which no gap exists between the terminal (150) and the current collecting member (140) can be maintained.

[0108] Fig. 4 is a plan view of a terminal according to one embodiment. Fig. 4 shows a plan view of the terminal (150) of Figs. 2a and 3a viewed from above in a downward direction.

[0109] Referring to FIG. 4, the terminal (150) may include a center portion (152), a center peripheral portion (153a), a recessed portion (153b), and an outer connection portion (154) arranged in an outward order based on the center point (c1).

[0110] The terminal (150) may include a dog point (157), a pin member (156), and a fixed pin (159) arranged in an outward order based on the center point (c1) of the terminal pin (155).

[0111] The fixed pin (159) may be arranged in a form that surrounds the outer end of the pin member (156). The recessed portion (153b) may be arranged in a form that surrounds the outer end of the fixed pin (159). However, FIG. 4 is only an example, and it may be possible for parts of the fixed pin (159) and the recessed portion (153b) to be omitted.

[0112] Meanwhile, the battery cell (100) according to the present disclosure may be utilized in a battery assembly (not shown) such as a battery module, a battery pack, and an energy storage system. That is, the battery assembly may include the battery cell (100) and a receiving space (not shown) for receiving the battery cell (100). The receiving space may be formed by a housing or a frame.

[0113] For example, the above-mentioned accommodation space can accommodate a plurality of battery cells (100).

Claims

1. A case including a case body forming a receiving space and at least one cap plate; An electrode assembly arranged in the above-mentioned receiving space; and a terminal assembly coupled to at least one cap plate; The above terminal assembly A current collecting member electrically connected to the electrode assembly and having a through hole formed therein; and A battery cell including a terminal inserted into the through hole and in contact with the current collecting member.

2. In paragraph 1, The above terminal is a terminal head in contact with the above-mentioned collector member; and A battery cell characterized by comprising a terminal pin extending from the terminal head toward the cap plate and inserted into the through hole.

3. In paragraph 2, The above terminal is A battery cell further comprising a fixing pin disposed on the terminal head along the periphery of the terminal pin.

4. In paragraph 3, The above fixed pin A battery cell characterized in that it is provided spaced apart from the outside of the terminal pin so as to surround the terminal pin with the terminal pin as the center.

5. In paragraph 3, The above fixed pin A battery cell characterized in that, when looking at the fixed pin from the cap plate, the battery cell is arranged in an arc shape with the terminal pin as the center.

6. In paragraph 3, The diameter of the above through hole is A battery cell characterized in that the diameter of the pin structure including the terminal pin and the fixed pin is equal to or larger than that of the pin structure.

7. In paragraph 3, At least a portion of the above terminal head A battery cell characterized in that it includes a recessed portion positioned further away from the fixed pin in the radial direction of the terminal head with the terminal pin as the center, and recessed in a direction away from the cap plate.

8. In paragraph 7, The above-mentioned depression A battery cell characterized in that it includes a section in which the vertical length gradually increases toward the outside of the terminal head.

9. In paragraph 3, The above-mentioned collector member includes a through-hole periphery and a plate, The area around the above through hole A battery cell characterized in that the terminal pin and the fixed pin come into contact with the terminal head when inserted into the through hole.

10. In paragraph 9, Further comprising a recessed portion positioned further away from the fixed pin in the radial direction of the terminal head with the terminal pin as the center, and recessed in a direction away from the cap plate; The area around the above through hole A battery cell characterized by being located between the fixed pin and the recessed portion.

11. In paragraph 9, The above fixed pin A battery cell characterized in that the terminal pin and the fixed pin are bent when inserted into the through hole and bent outward so as to contact the upper portion of the periphery of the through hole.

12. In paragraph 11, The above fixed pin A battery cell characterized in that the terminal pin is bent outward so as to contact the upper portion of the periphery of the through hole by compression of the pressing portion while the terminal pin is inserted into the hole of the pressing portion.

13. In paragraph 12, The diameter of the hole of the above pressurized part is A battery cell characterized in that the diameter of the pin structure including the terminal pin and the fixed pin is smaller than the diameter of the pin structure and is equal to or larger than the diameter of the fixed pin.

14. In paragraph 2, The above terminal pins are A battery cell characterized in that it is connected to the center portion of the terminal head.

15. In paragraph 14, The above terminal is Further comprising a fixed pin connected to the center periphery of the terminal head; A battery cell characterized in that when inserted into the through hole together with the terminal pin, the fixing pin is bent so as to contact the upper surface of the current collecting member.

16. In paragraph 15, The above terminal head A recessed portion connected to the outer end of the center periphery; and A battery cell characterized by including an outer connecting portion connected to the outer end of the above-mentioned recessed portion.

17. In paragraph 16, The vertical length of the above-mentioned depression is A battery cell characterized in that the vertical length of the outer connecting portion is smaller than that of the outer connecting portion.

18. In paragraph 2, The diameter of the above terminal head is A battery cell characterized by having a diameter larger than the diameter of the above through hole.

19. Battery cell of paragraph 1; and A battery assembly including a receiving space for receiving the above battery cell.

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