Battery cell

Abstract

The battery cell of the present disclosure comprises: a case including a case body forming an accommodation space and at least one cover plate; the electrode assembly is arranged in the accommodating space; and a terminal assembly coupled to the at least one cover plate. The terminal assembly includes: a current collecting member electrically connected to the electrode assembly and formed with a through hole; and a terminal including a terminal head portion, a terminal pin connected to the terminal head portion, and a protruding portion connected to the terminal head portion and the terminal pin, the current collecting member being coupled to the terminal by being pressed toward the protruding portion in a state in which the terminal pin is inserted into the through hole.

Description

Technical Field

[0001] This disclosure relates to a battery cell, specifically a battery cell including terminals. Background Technology

[0002] A single battery cell may include an electrode assembly, a current collector connected to the electrode assembly, and terminals connecting the current collector to an external device. The electrode assembly is a secondary battery that is repeatedly charged and discharged.

[0003] Terminals and current collectors can be joined by soldering. However, unsoldered or non-joined parts have weak electrical connections due to their high resistance. In this case, current flow is concentrated in the soldered area, which has relatively low resistance, thus causing concentrated heat generation at the soldered area. Summary of the Invention

[0004] Technical issues

[0005] First, the purpose of this disclosure is to provide a battery cell with improved stability.

[0006] Second, the purpose of this disclosure is to increase the contact area between the current collector and the terminal.

[0007] Third, the purpose of this disclosure is to reduce the resistance between the current collector and the terminal, thereby reducing heat generation.

[0008] Fourth, the purpose of this disclosure is to use mechanical means instead of conventional welding methods to join current collectors and terminals.

[0009] On the other hand, the battery cells according to this disclosure can be widely used in electric vehicles, battery charging stations, energy storage systems (ESS), and other green technology fields such as solar power generation and wind power generation that utilize battery cells. Furthermore, the battery cells according to this disclosure can be used in eco-friendly mobility devices, including electric vehicles and hybrid vehicles, to prevent climate change by reducing air pollution and greenhouse gas emissions.

[0010] Technical solution

[0011] A battery cell according to an embodiment of the present disclosure includes: a housing, including a housing body with one open side and at least one cover plate, the cover plate being coupled to the housing body to close the open side; an electrode assembly housed inside the housing; and a terminal assembly coupled to the at least one cover plate, the terminal assembly including: a current collector electrically connected to the electrode assembly and having a through hole; a terminal head located in the opposite direction to the cover plate with respect to the current collector; a terminal pin extending from the terminal head toward the cover plate and inserted into the through hole; and a protrusion extending from the terminal head toward the cover plate, connected to the outer side of the terminal pin, and contacting the current collector together with at least a portion of the terminal head.

[0012] In one embodiment, after the terminal pin is inserted through the through hole, the current collector is subjected to pressure toward the protrusion and can contact the protrusion and the terminal head.

[0013] In one embodiment, the length of the protrusion extending toward the cover plate with respect to the terminal head may be less than the vertical height of the terminal head.

[0014] In one embodiment, the protrusions are provided in a plurality of locations, and the plurality of protrusions are arranged at preset intervals around the terminal pin.

[0015] In one embodiment, the terminal head includes: a head center portion connected to the terminal pin; an inner connecting portion connected to the outer end of the head center portion; and an outer connecting portion connected to the outer end of the inner connecting portion, wherein a plurality of the protrusions may be provided on the inner connecting portion.

[0016] In one embodiment, the shape of the vertical cross-section of the protrusion can be a triangle or a round triangle.

[0017] In one embodiment, the protrusion includes a first protrusion and a second protrusion that are adjacent to each other. In a vertical cross-section of the terminal, the angle between adjacent edges of the first protrusion and the second protrusion may be greater than the angle between a first line connecting the center point of the terminal and the valley point of the first protrusion and a second line connecting the center point of the terminal and the peak of the first protrusion in the vertical cross-section of the terminal.

[0018] In one embodiment, the vertical cross-section of the terminal pin may be circular.

[0019] In one embodiment, the terminal pin may include: a pin component connected to the upper end of the center portion of the head; and a stop point connected to the upper end of the pin component, protruding in the vertical direction with a decreasing length in the horizontal direction.

[0020] In one embodiment, the terminal pin and the terminal head are formed in a cylindrical shape, and the through hole is also formed in a circular shape corresponding to the shape of the terminal pin. The outer diameter of the terminal head can be greater than or equal to the inner diameter of the through hole.

[0021] In one embodiment, the current collection component may further include: a plate having a plate shape including the through hole; and a peripheral portion of the through hole located on the plate within a predetermined reference distance with respect to the through hole.

[0022] When the terminal head contacts the plate, the periphery of the through hole can protrude toward the cover plate with reference to the plate.

[0023] In one embodiment, the terminal pin is formed in a cylindrical shape, and the protrusion may be located in the region within the reference distance centered on the terminal pin at the terminal head.

[0024] In one embodiment, the peripheral portion of the through hole, in a first state where it forms a plane with the plate before the flow collecting component pressurizes the protrusion, can deform from the first state to a second state where at least a portion protrudes toward the cover plate when the flow collecting component pressurizes the protrusion.

[0025] In one embodiment, the free end of the terminal pin may be located at a position higher than that of the cover plate, with reference to the current collecting component.

[0026] In one embodiment, the battery cell may further include an insulator for separating the current collector, the terminal head, and the terminal pin from the electrode assembly and the housing.

[0027] On the other hand, a battery assembly according to an embodiment of the present disclosure may include: the battery cell; and a receiving space including the battery cell.

[0028] The effects of the invention

[0029] According to embodiments of this disclosure, battery cells with improved stability can be provided.

[0030] According to embodiments of this disclosure, the resistance of the terminals can be improved, and the thermal behavior can be improved.

[0031] According to embodiments of this disclosure, mechanical methods can be used instead of welding to join terminals and current collectors.

[0032] According to embodiments of this disclosure, the manufacturing process of battery cells can be simplified and manufacturing costs can be reduced. Attached Figure Description

[0033] Figure 1a A diagram illustrating a battery cell according to one embodiment. Figure 1b A diagram illustrating a terminal assembly according to one embodiment;

[0034] Figure 2a and Figure 2b This is a diagram illustrating the connection between a current collector and a terminal according to an embodiment;

[0035] Figure 3a and Figure 3b A cross-sectional view illustrating the connection between a current collector and a terminal according to an embodiment;

[0036] Figure 4 This is a top view of a terminal according to an embodiment. Detailed Implementation

[0037] The structural or functional descriptions of the embodiments disclosed in this specification or application are merely illustrative of embodiments based on the technical concept of the present invention. Embodiments based on the technical concept of the present invention may also be implemented in various forms other than those disclosed in this specification or application, and should not be construed as limiting the technical concept of the present invention to the embodiments disclosed in this specification or application.

[0038] Figure 1a A diagram illustrating a battery cell according to one embodiment. Figure 1b A diagram illustrating a terminal assembly according to one embodiment. Figure 1b Show Figure 1a The cross-section S1 of the terminal assembly.

[0039] Reference Figure 1a and Figure 1b According to one embodiment, the battery cell 100 may include an electrode assembly 110, a housing 120, and a terminal assembly 130. 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] Electrode assembly 110 may include electrodes, a diaphragm, and lead tabs 115. The electrodes may include a positive electrode and a negative electrode. The diaphragm may be an insulator with electrical insulation properties. Lead tabs 115 may include a positive lead tab and a negative lead tab. The positive lead tab may be electrically connected to the positive electrode, and the negative lead tab may be electrically connected to the negative electrode. For example, electrode assembly 110 may be a laminate wound with electrodes (e.g., negative and positive electrodes) on both sides of the diaphragm and lead tabs 115 connected to the electrodes.

[0041] The electrode assembly 110 may be disposed within the receiving space of the housing 120. The electrode assembly 110 may also include an electrolyte. For example, the electrolyte may be a substance capable of enabling lithium ion movement. The electrolyte may be a liquid or a solid substance.

[0042] The housing 120 can be a structure with an internal accommodating space. For example, the housing 120 can be a hollow hexahedron, cylinder, or other shape. The housing 120 can be made of aluminum or aluminum alloy, but is not limited to these materials and can be implemented using various materials.

[0043] The housing 120 may include a housing body 121 and at least one cover plate 125. For example, the number of cover plates 125 may be one or two.

[0044] The shell body 121 can form an accommodating space with at least one open side.

[0045] The cover plate 125 can be attached to the housing body 121. For example, the electrode assembly 110 can be installed in the accommodating space inside the housing body 121 and then attached to the housing body 121 to seal the accommodating space. In this case, the cover plate 125 can be attached to the housing body 121 by means of bolts, welding, clamps, protrusions, etc.

[0046] The cover plate 125 can be coupled to the terminal assembly 130. For example, a hole may be formed in the cover plate 125. The cover plate 125 can be coupled to the terminal assembly 130 by inserting the terminal assembly 130 into the hole in the cover plate 125.

[0047] In one embodiment, the housing body 121 may form an open receiving space. For example, the open surface may be the upper surface. The electrode assembly 110 can be inserted into the receiving space via the upper surface. Furthermore, a cover plate 125 may be attached to the housing body 121 to close the open upper surface of the receiving space. In this case, two terminal assemblies 130 may be attached to a cover plate 125.

[0048] In another embodiment, the housing body 121 may form a receiving space with two open sides. For example, the two open sides may be an upper side and a lower side, through which the electrode assembly 110 can be inserted and disposed in the receiving space. Moreover, two cover plates 125 may be attached to the housing body 121 to close the open upper and lower sides of the receiving space. In this case, a terminal assembly 130 may be attached to one cover plate 125.

[0049] Terminal assembly 130 is a structure for electrically connecting electrode assembly 110 and an external device. 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 tabs 115 of 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. Similarly, terminal 150 is divided into one of a first terminal 150a and a second terminal 150b, one of which can be a positive terminal and the other can be a negative terminal.

[0050] Terminal assembly 130 may include current collector 140 and terminal 150.

[0051] 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.

[0052] Terminal 150 can be electrically connected to current collector 140. Specifically, terminal 150 can be directly electrically connected by contacting current collector 140. Current collector 140 and terminal 150 can be made of conductive metal.

[0053] Terminal 150 can be electrically connected to an external device. Terminal 150 can be electrically connected to the electrode assembly 110 via current collector 140. That is, an external device can be electrically connected to the electrode assembly 110 via terminal 150 and current collector 140. The external device can be other battery cells, sensing devices, battery management systems, or other similar devices.

[0054] On the other hand, refer to Figure 1b and Figure 3b The relative positions of the cover plate 125, the current collector 140, and the terminal 150 can be determined. Therefore, it can be determined that the terminal 150 is in contact with the current collector 140, but is separated from the cover plate 125.

[0055] Therefore, the battery cell 100 may also include insulators 161, 163, 165, 166 for separating the terminal assembly 130 from the housing 120 and from the electrode assembly 120.

[0056] In an embodiment, the terminal assembly 130 may further include a first insulator 161, an insulating sleeve 162, a second insulator 163, a rivet 164, a third insulator 165, a fourth insulator 166, a terminal plate 170, and a welding portion 180.

[0057] For example, the first insulator 161, the insulating sleeve 162, the second insulator 163, the third insulator 165, and the fourth insulator 166 can be structures with electrical insulation or high resistance characteristics. For example, the rivet 164, the terminal plate 170, and the welded part 180 can be structures with conductivity.

[0058] A first insulator 161 may be disposed between the electrode assembly 110 and the terminal 150. A side end of the first insulator 161 may be disposed between the lead tab 115 of the electrode assembly 110 and the current collector 140. The first insulator 161 may block the direct electrical connection between the lead tab 115 of the electrode assembly 110 and the terminal 150.

[0059] The insulating sleeve 162 is a structure used to fix the rivet 164. The insulating sleeve 162 and the second insulator 163 can block the direct electrical connection between the lead tab 115 of the electrode assembly 110 and the cover plate 125.

[0060] Rivet 164 can secure the current collector 140 and the terminal 150. For example, 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 sleeve 162 in the upper space of the current collector 140.

[0061] The third insulator 165 can block the direct electrical connection between the rivet 164 and the cover plate 125. For example, the third insulator 165 can be disposed between the rivet 164 and the cover plate 125. The fourth insulator 166 can block the direct electrical connection between the cover plate 125 and the terminal plate 170. For example, the fourth insulator 166 can be disposed between the cover plate 125 and the terminal plate 170.

[0062] The solder joint 180 can be formed between the lead tab 115 and the current collector 140 by soldering. The solder joint 180 can electrically connect the lead tab 115 and the current collector 140 to each other.

[0063] The manner and structure of connecting the current collector 140 to the terminal 150 will be described in detail below with reference to the accompanying drawings.

[0064] Figure 2a and Figure 2b This is a diagram illustrating the connection between a current collector and a terminal according to an embodiment. Figure 2a This shows the state before the current collector and the terminal are connected. Figure 2b This shows the connection between the current collector and the terminal. (Refer to...) Figure 2a and Figure 2b The current collector 140 can be mechanically engaged with the terminal 150. For example, the current collector 140 can be pressed into the terminal 150 while the terminal 150 is inserted into the through hole 145.

[0065] Specifically, a through hole 145 may be formed in the current collector 140. That is, the current collector 140 may include a through hole 145. The through hole 145 may be an area for inserting the terminal 150, or it may be an open area.

[0066] In an embodiment, the current collector 140 may include a plate 141 and a through-hole periphery 143. The plate 141 may be the area that contacts the terminal head 151. The through-hole periphery 143 may be the peripheral area of ​​the through-hole 145. For example, the through-hole periphery 143 may be defined as the area within a reference distance from the through-hole 145. The shape of the through-hole 145 may be the same as the shape of the terminal pin 155. For example, the through-hole 145 may be circular, but this is only one embodiment and various shapes may be formed. Preferably, in order to reduce stress concentration and maximize contact, the terminal pin 155 may be cylindrical, and the through-hole 145 may also be circular accordingly. For the same reason, the terminal head 155 may also be cylindrical.

[0067] Therefore, the terminal pin 151 and the terminal head 155 are formed in a cylindrical shape, and the through hole 145 can be circular. Furthermore, the outer diameter of the terminal head 155 can be greater than or equal to the inner diameter of the through hole 145. Additionally, the vertical height of the terminal pin 151 can be greater than the vertical height of the terminal head 155 and the thickness of the current collector 140.

[0068] Terminal 150 may include a terminal head 151, a terminal pin 155, and a protrusion 159. The terminal head 151 and the terminal pin 155 may be connected to each other. The protrusion 159 may be connected to the terminal head 151 and the terminal pin 155. In an embodiment, the terminal head 151, the terminal pin 155, and the protrusion 159 may be manufactured as a single integral part. For example, the terminal head 151, the terminal pin 155, and the protrusion 159 may be manufactured by forging, extrusion, or casting.

[0069] In addition, in order to apply pressure to the periphery of the through hole 143, the protrusion 159 may be located in the area on the terminal head 151 within a reference distance centered on the terminal pin 155, corresponding to the position of the periphery of the through hole 143.

[0070] Additionally, the free end of the terminal pin 155, which extends from the terminal head 151 toward the cover plate 125, may protrude further upward than the cover plate 125. This is for the purpose of electrically connecting the terminal pin 155 to the external electrode assembly 110.

[0071] In one embodiment, the current collector 140 may be engaged with the terminal 150 in a state of contacting the terminal head 151 and the protrusion 159.

[0072] To give a specific example, refer to Figure 2aThe current collector 140 can be aligned with the upper part of the terminal 150 so that the terminal pin 155 can be inserted into the through hole 145. Then, with the terminal pin 155 inserted into the through hole 145, the current collector 140 can be compressed in the vertical direction. In this case, the periphery 143 of the through hole can be compressed with high pressure by pressing. The vertical direction can be the -z axis direction.

[0073] Reference Figure 2a and Figure 2b When the terminal pin 155 is inserted into the through hole 145, the current collector 140 is compressed, and the current collector 140 can engage with the terminal 150. Through compression, the current collector 140 can be deformed into a shape that mates with the terminal head 151 and the protrusion 159. There may be no gap between the current collector 140 and the terminal 150. That is, the plate 141 and the periphery 143 of the through hole of the current collector 140 can be tightly fitted with the terminal head 151 and the protrusion 159.

[0074] Figure 3a and Figure 3b This is a cross-sectional view illustrating the combination of a current collector and a terminal according to an embodiment.

[0075] Reference Figure 3a and Figure 3b Terminal 150 may include a terminal head 151, a terminal pin 155, and a protrusion 159. In an embodiment, the upper end of the terminal head 151 and the lower end of the terminal pin 155 may be connected to each other. The protrusion 159 may be connected to the outer end of the terminal head 151 and the upper end of the terminal pin 155.

[0076] In one embodiment, the terminal head 151 may include a head center portion 152, an inner connecting portion 153, and an outer connecting portion 154.

[0077] The head center portion 152 may be located at the lower end of the terminal pin 155. For example, the upper end of the head center portion 152 may be connected to the lower end of the terminal pin 155. The inner connecting portion 153 may be located at the outer end of the head center portion 152. In this case, the inner end of the inner connecting portion 153 may be connected to the outer end of the head center portion 152. The outer connecting portion 154 may be located at the outer end of the inner connecting portion 153. For example, the inner end of the outer connecting portion 154 may be connected to the outer end of the inner connecting portion 153. Here, the outer end may refer to the end portion located in the outward direction with the center point c1 as a reference.

[0078] In one embodiment, the terminal pin 155 may include a pin component 156 and a stop point 157.

[0079] The pin component 156 may be disposed at the upper end of the terminal head 151. For example, the lower end of the pin component 156 may be connected to the upper end of the head center portion 152 of the terminal head 151.

[0080] The pin component 156 can be a portion that is inserted into the through hole 145. For example, the shape of the pin component 156 can be cylindrical. In this case, the vertical cross-sectional shape of the pin component 156 can be circular. Here, the vertical cross-sectional shape refers to the shape of the cross-section relative to the vertical direction. For example, the vertical direction can be the z-axis direction.

[0081] The stop point 157 may be located at the upper end of the pin component 156. For example, the lower end of the stop point 157 may be connected to the upper end of the pin component 156. The stop point 157 may protrude vertically in a manner that decreases in horizontal length. For example, the horizontal length may be a diameter. For example, the vertical direction may be the +z axis direction. That is, the horizontal length of the stop point 157 may gradually decrease from the lower end to the upper end. The stop point 157 may be the portion that is inserted into the through hole 145 before the pin component 156. The stop point 157 may function as a guide to facilitate easy insertion of the pin component 156 into the through hole 145.

[0082] In one embodiment, the vertical height y1 of the protrusion 159 may be lower than the vertical height y2 of the terminal head 151. The vertical height can represent the length in the vertical direction, which can be the z-axis direction.

[0083] The current collection component 140 may include a plate 141, a through hole periphery 143, and a through hole 145.

[0084] In this embodiment, the horizontal length w1 of the through hole 145 can be greater than or equal to the horizontal length x1 of the pin component 156. The horizontal lengths w1 and x1 can be either the length or diameter in the horizontal direction. The horizontal direction can be the x-axis direction.

[0085] In a specific embodiment, refer to Figure 3a The current collector 140 can be aligned with the upper part of the terminal 150 so that the pin 156 can be inserted into the through hole 145. Moreover, with the terminal pin 155 inserted into the through hole 145, the periphery 143 or plate 141 of the through hole can be pressed so that the current collector 140 is in close contact with the terminal head 151.

[0086] Reference Figure 3b By extrusion, the lower end of the through-hole periphery 143 of the collector 140 and the lower end of the plate 141 can be joined to the upper end of the protrusion 159 and the upper end of the outer connecting portion 154. In this case, the shape of the collector 140 can be deformed so that the uppermost end of the through-hole periphery 143 is higher than the uppermost end of the plate 141.

[0087] That is, the peripheral portion 143 of the through hole can be in a first state where it forms a plane with the plate 141 before the pressurized protrusion 159 of the collector component 140, and in a second state where at least a portion of it protrudes toward the cover plate 125 when the pressurized protrusion 159 of the collector component is applied.

[0088] As the current collector 140 approaches and contacts the protrusion 159, the protrusion 159 applies pressure to the periphery of the through hole 143, and the periphery of the through hole 143 can deform from the first state to the second state due to stress concentration.

[0089] On the other hand, refer to Figure 1b and Figure 3b The relative positions of the cover plate 125, the current collector 140, and the terminal 150 can be determined. Therefore, it can be determined that the terminal 150 is in contact with the current collector 140, but is separated from the cover plate 125.

[0090] Figure 4 This is a top view of a terminal according to an embodiment. Figure 4 Showing a view from top to bottom Figure 2a and Figure 3a Top view of terminal 150.

[0091] Reference Figure 4 In one embodiment, the vertical cross-section of the terminal pin 155 can be circular. Here, "vertical cross-section" refers to a cross-section relative to a vertical direction, which can be the z-axis direction. For example, the vertical cross-section of the terminal pin 155 can be a circle with a first reference diameter x1 relative to the center point c1. In another embodiment, the through-hole 145 of the current collector 140 can be a circle with a second reference diameter greater than or equal to the first reference diameter x1.

[0092] In one embodiment, multiple protrusions 159 may be provided on the inner connecting portion 153. The protrusions 159 may be configured to surround the outer end of the terminal head 151. That is, the protrusions 159 may connect the outer end of the terminal head 151 and the upper end of the inner connecting portion 153.

[0093] In one embodiment, the shape of the vertical cross-section of the protrusion 159 can be a triangle or a circular triangle. The vertical cross-section refers to a cross-section relative to a vertical direction, which can be the z-axis direction. The triangle or circular triangle can be a shape with three vertices. A circular triangle can be defined as a triangle whose at least one of its three sides is a curve.

[0094] In one embodiment, the protrusion 159 may include a first protrusion and a second protrusion that are adjacent to each other. In one embodiment, in a vertical cross-section of the terminal 150, the angle α1 between the first line l1 and the second line l2 that are adjacent to each other of the first and second protrusions may be greater than the angle α2 between the third line l3 that connects the center point c1 of the terminal 150 and the valley bottom point of the first protrusion and the fourth line l4 that connects the center point c1 of the terminal 150 and the peak apex of the first protrusion. The first line l1 and the second line l2 may be adjacent edges. The third line l3 may be a line connecting the apex of a valley corresponding to any protrusion and the center point c1. The fourth line l4 may be a line connecting the apex of a peak corresponding to the same protrusion and the center point c1.

[0095] On the other hand, the battery cell 100 according to this disclosure can be applied to battery assemblies (not shown), such as battery modules, battery packs, and energy storage systems. That is, the battery assembly may include the battery cell 100 and a housing space (not shown) for accommodating the battery cell 100. The housing space may be formed by a housing or frame.

[0096] As an example, the accommodating space can accommodate multiple battery cells 100.

Claims

1. A single battery cell, comprising: A housing includes a housing body with one open side and at least one cover plate, the cover plate being coupled to the housing body to close the open side; The electrode assembly is housed inside the housing; as well as Terminal assembly, incorporated into at least one cover plate, The terminal assembly includes: A current collector is electrically connected to the electrode assembly and has a through hole; The terminal head, with the current collecting component as a reference, is located in the opposite direction to the direction of the cover plate; A terminal pin extends from the terminal head toward the cover plate and is inserted into the through hole; and The protrusion extends from the terminal head toward the cover plate, connects to the outer side of the terminal pin, and contacts the current collector together with at least a portion of the terminal head.

2. The battery cell according to claim 1, characterized in that: After the terminal pin is inserted through the through hole, the current collector is subjected to pressure toward the protrusion and contacts the protrusion and the terminal head.

3. The battery cell according to claim 1, characterized in that: The length of the protrusion extending toward the cover plate with respect to the terminal head is less than the vertical height of the terminal head.

4. The battery cell according to claim 1, characterized in that: The protrusions are provided in multiple portions. The plurality of protrusions are arranged at predetermined intervals around the terminal pin.

5. The battery cell according to claim 1, characterized in that, The terminal head includes: The center of the head is connected to the terminal pin; The inner connecting part is connected to the outer end of the center part of the head; and The outer connecting part is connected to the outer end of the inner connecting part. The inner connecting portion is provided with a plurality of protrusions.

6. The battery cell according to claim 5, characterized in that: The vertical cross-section of the protrusion is triangular or circular triangle.

7. The battery cell according to claim 6, characterized in that: The protrusions include a first protrusion and a second protrusion that are adjacent to each other. In the vertical cross-section of the terminal, the angle between the adjacent edges of the first protrusion and the second protrusion is greater than the angle between the first line connecting the center point of the terminal and the valley point of the first protrusion and the second line connecting the center point of the terminal and the peak of the first protrusion in the vertical cross-section of the terminal.

8. The battery cell according to claim 5, characterized in that: The vertical cross-section of the terminal pin is circular.

9. The battery cell according to claim 5, characterized in that, The terminal pin includes: A pin component is connected to the upper end of the center portion of the head; and The stop point is connected to the upper end of the pin component and protrudes vertically in a manner that decreases in length in the horizontal direction.

10. The battery cell according to claim 1, characterized in that: The terminal pin and the terminal head are formed in a cylindrical shape. The through hole is also circular, corresponding to the shape of the terminal pin. The outer diameter of the terminal head is greater than or equal to the inner diameter of the through hole.

11. The battery cell according to claim 1, characterized in that, The current collection component also includes: A plate having a plate shape including the through hole; and The periphery of the through hole is located within a predetermined reference distance on the plate, with the through hole as a reference. When the terminal head contacts the plate, the periphery of the through hole protrudes toward the cover plate with reference to the plate.

12. The battery cell according to claim 11, characterized in that: The terminal pin is formed in a cylindrical shape. The protrusion is located in the area of ​​the terminal head within the reference distance centered on the terminal pin.

13. The battery cell according to claim 11, characterized in that: In a first state, before the flow collecting component applies pressure to the protrusion, the periphery of the through hole forms a plane with the plate. When the flow collector presses on the protrusion, it deforms from the first state to a second state in which at least a portion protrudes toward the cover plate.

14. The battery cell according to claim 1, characterized in that: The free end of the terminal pin is located above the position of the cover plate, with the current collecting component as a reference.

15. The battery cell according to claim 1, characterized in that, Also includes: An insulator is provided to separate the current collector, the terminal head, and the terminal pin from the electrode assembly and the housing.

16. A battery assembly, comprising: The battery cell according to claim 1; as well as The space is for accommodating the individual battery cells.

Images