Current collecting pin, cover plate assembly and battery

Abstract

The utility model provides a current collecting pin, a cover plate assembly and a battery, and relates to the technical field of batteries. The current collecting needle comprises a body, and a groove body is arranged on the peripheral surface of the body. According to the battery, the groove body is formed in the peripheral surface of the body, so that the space occupied by the current collecting pin in the battery can be controlled, the outer surface area of the current collecting pin can be increased, the contact area of the current collecting pin and a positive electrode can be increased, and the current collecting area of the current collecting pin can be increased.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a current collecting needle, a cover plate assembly and a battery. Background Art

[0002] In the related art, a lithium-ion battery is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. The lithium-ion battery includes a shell, a positive electrode, a negative electrode, a side mold, a bottom film, an upper cover film, and a cover assembly that closes the shell. The cover assembly includes a cover, a pole that is insulated and isolated from the cover by a glass seal, and a current collecting needle that connects the pole to the positive electrode. Due to the small size of the current collecting needle, its current collecting area is small, which leads to a small discharge current of the lithium-ion battery using the current collecting needle, thereby limiting the application scope of the lithium-ion battery. If the current collecting area is increased by increasing the size of the current collecting needle, the space occupied by the current collecting needle inside the battery will increase, which will have an adverse effect on the energy density of the lithium-ion battery. Utility Model Content

[0003] The embodiments of the present application provide a current collecting needle, a cover plate assembly and a battery, which can improve the problem of a small current collecting area of the current collecting needle.

[0004] In a first aspect, an embodiment of the present application provides a current collecting needle, which includes a body, and a groove body is provided on the outer peripheral surface of the body.

[0005] In one embodiment, the groove body is extended along the circumference of the main body.

[0006] In one embodiment, the groove body is an annular groove, and the axis of the annular groove is parallel to the axis of the current collecting needle.

[0007] In one embodiment, there are a plurality of annular grooves, and the plurality of annular grooves are sequentially arranged along the extending direction of the axis of the current collecting needle.

[0008] In one embodiment, the surface of the body between two adjacent annular grooves is a first arcuate surface, the first arcuate surface is convexly arranged away from the axis of the collecting needle, and both sides of the first arcuate surface are smoothly connected to the groove walls of the adjacent annular grooves.

[0009] In one embodiment, the bottom wall of the annular groove is a second arc surface, the second arc surface is concavely arranged close to the axis of the current collecting needle, and both sides of the second arc surface are smoothly connected to the adjacent first arc surfaces respectively.

[0010] In one embodiment, the groove body is a spiral groove, and the spiral center line of the spiral groove is parallel to the axis of the current collecting needle.

[0011] In one embodiment, the groove bottom wall of the spiral groove is a third arc surface, the third arc surface is concavely arranged close to the axis of the current collecting needle, and both sides of the third arc surface are smoothly connected to the outer peripheral surface of the body.

[0012] In one embodiment, at least part of the outer circumference of the body is a spiral surface, which is a fourth arcuate surface. The fourth arcuate surface is convexly arranged away from the axis of the collecting needle, and both sides of the fourth arcuate surface are smoothly connected to adjacent third arcuate surfaces respectively.

[0013] In one embodiment, the body is a hollow structure.

[0014] In one embodiment, the body is a structure with uniform wall thickness.

[0015] In one embodiment, an upper through hole and a lower through hole communicating with the interior of the body are respectively provided at both ends of the body.

[0016] In one embodiment, the two ends of the body are respectively a top end and a bottom end, the top end is configured to be connected to the pole of the battery, and the body has a variable diameter section located at the bottom end, and the outer diameter of the variable diameter section gradually decreases in the direction away from the top end.

[0017] In one embodiment, a chamfer is provided between the outer peripheral surface of the body and the end surface of the bottom end.

[0018] In one embodiment, a conductive layer is disposed on the outer peripheral surface of the body and / or the inner wall of the slot body, and the conductive layer is one or more of a nickel-plated layer, a gold-plated layer, and a carbon-coated layer.

[0019] In the second aspect, an embodiment of the present application provides a cover plate assembly, which includes a cover plate, a pole and the aforementioned collecting needle; the cover plate is provided with a mounting hole; the pole is passed through the mounting hole, and the pole is connected to the cover plate through an insulating seal; one end of the body is connected to the pole.

[0020] In one embodiment, the cover plate assembly further includes a positioning bracket, which is sleeved on the pole and / or the current collecting needle and cooperates with the pole stopper. The positioning bracket has a supporting portion, which is configured to abut against the positive electrode of the battery cell.

[0021] In one embodiment, the positioning bracket includes a sleeve portion and a supporting portion. The sleeve portion is sleeved on the pole and / or the collecting needle and cooperates with the pole to stop. The end of the sleeve portion facing away from the cover plate is connected to the supporting portion; the supporting portion extends from the sleeve portion in a direction away from the axis of the collecting needle.

[0022] In one embodiment, the positioning bracket is a conductor, the abutting portion includes a body and a contact portion protruding from a surface of the body toward the positive electrode of the battery cell, and the contact portion is configured to contact the positive electrode of the battery cell.

[0023] In one embodiment, the contact portion is disposed between the body and the sleeve portion, and two ends of the contact portion are respectively connected to the body and the sleeve portion.

[0024] In one embodiment, the positioning bracket further includes a positioning ring. The positioning ring is located between the abutting portion and the cover plate. One end of the positioning ring facing away from the cover plate is connected to the periphery of the abutting portion.

[0025] In one embodiment, the abutting portion is provided with a first through hole for the electrolyte to flow through.

[0026] In one embodiment, the pole column has a shoulder. The large-diameter section of the pole column is located on the side of the shoulder facing away from the positioning bracket, and the positioning bracket abuts against the shoulder.

[0027] In one embodiment, the pole column is inserted into the body.

[0028] In one embodiment, the pole column has a shoulder. The small-diameter section of the pole column is located on the side of the shoulder close to the body. The small-diameter section is inserted into the body, and the end of the body abuts against the shoulder.

[0029] In one embodiment, the mounting hole is a two-stage stepped hole. The small-diameter section of the two-stage stepped hole is close to the body. The insulating seal is arranged between the hole wall of the mounting hole and the pole column, and both sides of the insulating seal are hermetically connected to the outer peripheral surface of the pole column and the hole wall of the mounting hole respectively.

[0030] In one embodiment, the cover plate is provided with a liquid injection hole. An annular boss is arranged on the side of the cover plate facing away from the current collector pin, and the annular boss is located between the liquid injection hole and the pole column.

[0031] In one embodiment, the cover plate is a stamping part. A first annular groove is arranged on the side of the cover plate close to the current collector pin, and the first annular groove is arranged opposite to the annular boss.

[0032] In one embodiment, a boss is arranged on the side of the cover plate close to the current collector pin, and the boss extends along the circumferential direction of the mounting hole.

[0033] In a third aspect, an embodiment of the present application provides a battery, which includes the aforementioned current collector pin or the aforementioned cover plate assembly.

[0034] Advantageous effects of the embodiments of the present application:

[0035] In the embodiments of the present application, by providing a groove on the outer peripheral surface of the body, not only the space occupied by the current collector pin inside the battery can be controlled, but also the outer surface area of the current collector pin can be increased, so as to increase the contact area between the current collector pin and the positive electrode, and further increase the current collection area of the current collector pin. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.

[0037] Figure 1 is a schematic structural diagram of a current collector pin provided by an embodiment of the present application;

[0038] Figure 2 is provided by an embodiment of the present application Figure 1 an enlarged view of part A in;

[0039] Figure 3 is a schematic structural diagram of another current collector pin provided by an embodiment of the present application;

[0040] Figure 4 is provided by an embodiment of the present application Figure 3 an enlarged view of part B in;

[0041] Figure 5 is provided by an embodiment of the present application Figure 1 an enlarged view of part C in;

[0042] Figure 6 is a schematic structural diagram of a cover plate assembly provided by an embodiment of the present application;

[0043] Figure 7 is a schematic structural diagram of another cover plate assembly provided by an embodiment of the present application;

[0044] Figure 8 is provided by an embodiment of the present application Figure 7 an enlarged view of part D in;

[0045] Figure 9 is a schematic structural diagram of yet another cover plate assembly provided by an embodiment of the present application;

[0046] Figure 10 is Figure 9 an enlarged view of part F in;

[0047] Figure 11 is provided by an embodiment of the present application Figure 6 an enlarged view of part E in;

[0048] Figure 12 is a schematic structural diagram of a battery provided by an embodiment of the present application;

[0049] Figure 13 is Figure 12 an enlarged view of part G in.

[0050] Explanation of reference numerals:

[0051] 001 - cover plate assembly;

[0052] 011 - Current collector needle; 111 - Body; 112 - Groove body; 1121 - First arc surface; 1122 - Second arc surface; 1123 - Third arc surface; 1124 - Fourth arc surface; 1111 - Hollow structure; 1112 - Upper through - hole; 1113 - Lower through - hole; 1114 - Reducing section; 1115 - Chamfer

[0053] 012 - Cover plate; 121 - Mounting hole; 122 - Annular boss; 123 - Liquid injection hole; 124 - First annular groove; 125 - Boss

[0054] 013 - Terminal post; 131 - Shoulder

[0055] 014 - Insulating seal

[0056] 015 - Positioning bracket; 151 - Abutting part; 1511 - First through - hole; 1512 - Body; 1523 - Contact part; 152 - Socket part; 153 - Positioning ring

[0057] 002 - Battery; 021 - Shell; 022 - Bottom film; 023 - Side film; 024 - Negative electrode; 025 - Positive electrode; 026 - Upper cover film; 027 - Sealing nail Detailed implementation manners

[0058] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0059] In addition, it should be understood that the specific implementation manners described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the orientation words such as "upper" and "lower" usually refer to the upper and lower in the actual use or working state of the device, specifically the drawing direction in the accompanying drawings; and "inner" and "outer" refer to the outline of the device.

[0060] The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0061] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, and can be the internal communication between two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0062] The term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0063] In the description of the embodiments of the present application, words such as "example" or "for example" are used to represent examples, explanations or descriptions. Any embodiment or design described as "for example" or "example" in the embodiments of the present application is not construed as being more preferred or having more advantages than another embodiment or design. The use of words such as "example" or "for example" is intended to present relative concepts in a clear manner.

[0064] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of the current collector pin 011 provided by the embodiment of the present application. The embodiment of the present application provides a current collector pin 011, and the current collector pin 011 includes a body 111. A groove 112 is provided on the outer peripheral surface of the body 111.

[0065] It can be understood that the structural shape of the groove 112 is not limited. The groove 112 can be a concave groove, and there are multiple concave grooves, which are distributed along the circumferential and axial directions of the current collector pin 011; the groove 112 can also be an annular groove, a spiral groove, etc.

[0066] In addition, when the current collector pin 011 is applied to a lithium thionyl chloride battery, the current collector pin 011 is inserted into the positive electrode, and both the outer peripheral surface of the body 111 and the inner wall of the groove 112 are in contact with the positive electrode.

[0067] In this embodiment, by providing a groove 112 on the outer peripheral surface of the body 111, the space occupied by the current collector pin 011 inside the battery can be controlled, and the outer surface area of the current collector pin 011 can be increased. As a result, the contact area between the current collector pin 011 and the positive electrode can be increased, and further, the current collection area of the current collector pin 011 can be increased. Thus, the lithium thionyl chloride battery using the current collector pin 011 has a larger discharge current, and the application range of the lithium thionyl chloride battery can be expanded.

[0068] Moreover, on the premise that the outer diameters of the current collector pins 011 are the same as those of other current collector pins, by providing a groove 112 on the outer peripheral surface of the body 111 of the current collector pin 011 provided in this embodiment, the positive electrode can be filled in the groove 112, thereby reducing the space occupied by the current collector pin 011 inside the battery, and further, the energy density of the lithium thionyl chloride battery can be improved.

[0069] In one embodiment, the groove 112 is provided to extend circumferentially along the body 111. It can be understood that the groove 112 can be a circular groove or a spiral groove extending circumferentially along the body 111, or a structure such as multiple segments of grooves provided at intervals circumferentially along the body 111.

[0070] Among them, when the groove 112 extends circumferentially along the body 111 as a circular groove, please refer to Figure 2 , Figure 2 which is an enlarged view of part A in Figure 1 provided by the embodiment of the present application. Specifically, the groove 112 is a circular groove, and the axis of the circular groove is parallel to the axis of the current collector pin 011.

[0071] Optionally, the axis of the circular groove is collinear with the axis of the current collector pin 011.

[0072] In this embodiment, through the above settings, the current collector pin 011 has a centrosymmetric structure, so that the stress state of the current collector pin 011 can be improved, and further, the reliability of the current collector pin 011 can be enhanced.

[0073] Please refer to Figure 1 , in one embodiment, there are multiple circular grooves, and the multiple circular grooves are sequentially arranged along the axial extension direction of the current collector pin 011.

[0074] Specifically, the multiple circular grooves are sequentially arranged at uniform intervals along the axis of the current collector pin 011.

[0075] In this embodiment, by providing multiple circular grooves, on the one hand, the surface area of the current collector pin 011 can be further increased, so that an embedded structure is formed between the positive electrode and the current collector pin 011, so that there is more contact area between the current collector pin 011 and the positive electrode, and further, the current collection surface of the current collector pin 011 can be further increased, and the current collection effect of the current collector pin 011 can be improved; on the other hand, the integrity of the current collector pin 011 and the positive electrode can be enhanced, so that the reliability of the cooperation between the current collector pin 011 and the positive electrode can be improved.

[0076] See also Figure 1 Or 2, in one embodiment, the surface of the main body 111 located between two adjacent annular grooves is a first arcuate surface 1121, the first arcuate surface 1121 is convexly arranged away from the axis of the collecting needle 011, and the two sides of the first arcuate surface 1121 are smoothly connected to the groove walls of the adjacent annular grooves.

[0077] In this embodiment, through the above arrangement, the force on the current collecting needle 011 between the two annular grooves is made more uniform, thereby reducing the possibility of local stress concentration, and further improving the structural stability and durability of the current collecting needle 011.

[0078] See also Figure 1 Or 2, in one embodiment, the bottom wall of the annular groove is a second arc surface 1122, the second arc surface 1122 is concavely arranged close to the axis of the collecting needle 011, and both sides of the second arc surface 1122 are smoothly connected to the adjacent first arc surface 1121 respectively.

[0079] In this embodiment, through the above-mentioned arrangement, on the one hand, the positive electrode can be better filled in the slot body 112 to avoid the existence of empty areas; on the other hand, the force on the collecting needle 011 at the annular groove is more uniform, thereby reducing the possibility of local stress concentration, and further improving the structural stability and durability of the collecting needle 011.

[0080] In addition, when the groove body 112 extends along the circumference of the main body 111 as a spiral groove, please refer to Figure 3 , Figure 3 1 is a schematic diagram of the structure of another current collecting needle 011 provided in an embodiment of the present application. The groove body 112 is a spiral groove, and the spiral center line of the spiral groove is parallel to the axis of the current collecting needle 011.

[0081] Optionally, the spiral center line of the spiral groove is arranged colinearly with the axis of the current collecting needle 011 .

[0082] In this embodiment, by setting the groove body 112 as a spiral groove, an embedded structure is formed between the positive electrode and the current collecting needle 011, so that there is more contact area between the current collecting needle 011 and the positive electrode, which can further increase the current collecting surface of the current collecting needle 011 and improve the current collecting effect of the current collecting needle 011.

[0083] In addition, by setting the groove body 112 as a spiral groove, the current collecting needle 011 can be screwed into the positive electrode, thereby reducing the obstruction of the positive electrode to the installation of the current collecting needle 011. Therefore, on the one hand, the efficiency of assembling the current collecting needle 011 to the positive electrode can be improved, and on the other hand, the integrity of the current collecting needle 011 and the positive electrode can be improved, thereby improving the reliability of the cooperation between the current collecting needle 011 and the positive electrode.

[0084] See alsoFigure 4 , Figure 4 is an enlarged view of the position B in the present application's embodiment. In one embodiment, the bottom wall of the spiral groove is a third arc surface 1123, the third arc surface 1123 is recessed inwardly near the axis of the current collector pin 011, and both sides of the third arc surface 1123 are smoothly connected to the outer peripheral surface of the body 111. Figure 3

[0085] In this embodiment, through the above arrangement, on the one hand, the filling property of the positive electrode in the groove body 112 can be made better, avoiding the existence of blank areas; on the other hand, the force on the current collector pin 011 at the groove body 112 is made more uniform, so as to reduce the possibility of local stress concentration, and further improve the structural stability and durability of the current collector pin 011.

[0086] Please refer to Figure 4 , in one embodiment, at least a part of the outer peripheral surface of the body 111 is a spiral surface, the spiral surface is a fourth arc surface 1124, the fourth arc surface 1124 protrudes outwardly away from the axis of the current collector pin 011, and both sides of the fourth arc surface 1124 are respectively and smoothly connected to the adjacent third arc surfaces 1123.

[0087] It can be understood that a part of the outer peripheral surface of the body 111 can be a spiral surface body 111, or the entire outer peripheral surface of the body 111 can be a spiral surface. Specifically, a part of the outer peripheral surface of the body 111 is used to form the spiral groove, and the other part forms a spiral surface after the spiral groove is formed.

[0088] In this embodiment, through the above arrangement, the force on the current collector pin 011 at the position between the adjacent groove walls is made more uniform, so as to reduce the possibility of local stress concentration, and further improve the structural stability and durability of the current collector pin 011.

[0089]

[0090] Please refer to Figure 1 or Figure 3 , in one embodiment, the body 111 is a hollow structure 1111. Specifically, the body 111 is a structure with equal wall thickness and is a thin-wall structure.

[0091] In this embodiment, by providing the hollow structure 1111 on the body 111, the thickness of the body 111 can be reduced, so that the body 111 has greater elasticity. Especially when the body 111 is a thin-wall structure, its elasticity is greater. Thus, the contact pressure between the current collector pin 011 and the positive electrode can be increased, so as to increase the reliability of the contact between the current collector pin 011 and the positive electrode, which is beneficial to enhancing the current collection effect of the current collector pin 011.

[0092] ​In addition, by setting the body 111 to have an equal wall thickness structure, the current collecting pin 011 can be more evenly stressed, thereby reducing the possibility of local stress concentration, further improving the compressive performance of the current collecting pin 011, and ultimately enhancing the structural stability and durability of the current collecting pin 011.

[0093] Please refer to Figure 1 and Figure 5 , Figure 5 which is an enlarged view of the C position in Figure 1 provided by an embodiment of the present application. In one embodiment, upper through holes 1112 and lower through holes 1113 that communicate with the inside of the body 111 are respectively provided at both ends of the body 111.

[0094] In this embodiment, through the above settings, when the battery is assembled and electrolyte is injected, a part of the electrolyte can flow into the hollow structure 1111 from the upper through hole 1112 and be discharged to the positive electrode from the lower through hole 1113, thereby improving the wetting efficiency of the battery.

[0095] Please refer to Figure 5 , in one embodiment, both ends of the body 111 are respectively a top end and a bottom end. The top end is configured to be connected to the pole 013 of the battery. The body 111 has a reduced-diameter section 1114 at the bottom end. Along the direction away from the top end, the outer diameter of the reduced-diameter section 1114 gradually decreases.

[0096] It can be understood that during battery assembly, after the negative electrode, the bottom film, the side film, the positive electrode, and the top film are placed in the housing 1, the current collecting pin 011 is inserted into the positive electrode. In this embodiment, by providing the reduced-diameter section 1114 at the end of the current collecting pin 011 away from the top end, the resistance of the current collecting pin 011 inserted into the positive electrode can be reduced, the stress state of the current collecting pin 011 can be improved, and the assembly efficiency can be increased.

[0097] In addition, the lower through hole 1113 is provided on the end face of the bottom end.

[0098] Please refer to Figure 5 , in one embodiment, a chamfer 1115 is provided between the outer peripheral surface of the body 111 and the end face of the bottom end.

[0099] Exemplarily, the chamfer 1115 is a rounded chamfer 1115.

[0100] In this embodiment, through the above settings, on the one hand, the resistance of the current collecting pin 011 inserted into the positive electrode can be further reduced; on the other hand, the stress state at the bottom end of the current collecting pin 011 can be improved, thereby enhancing the structural stability and durability of the current collecting pin 011.

[0101] In one embodiment, a conductive layer is provided on the outer peripheral surface of the body 111 and / or the inner wall of the groove 112. The conductive layer is one or more of a nickel plating layer, a gold plating layer, and a carbon coating layer.

[0102] It can be understood that a conductive layer is provided on the outer peripheral surface of the body 111, or on the inner wall of the groove body 112, or on both the outer peripheral surface of the body 111 and the inner wall of the groove body 112.

[0103] In this embodiment, through the above arrangement, the conductivity of the current collecting pin 011 can be improved, thereby enhancing the current collecting effect of the current collecting pin 011.

[0104] Please refer to Figure 6 , Figure 6 is a schematic structural diagram of the cover plate assembly 001 provided by the embodiment of the present application. The embodiment of the present application provides a cover plate assembly 001. The cover plate assembly 001 includes a cover plate 012, a pole column 013 and the aforementioned current collecting pin 011. The cover plate 012 is provided with a mounting hole 121. The pole column 013 passes through the mounting hole 121, and the pole column 013 is connected to the cover plate 012 through an insulating seal 014. One end of the body 111 is connected to the pole column 013.

[0105] Exemplarily, the insulating seal 014 is a glass insulator, and the glass insulator forms a glass seal between the pole column 013 and the mounting hole 121 to seal the pole column 013 and the mounting hole 121.

[0106] In addition, the pole column 013 can be directly welded to the current collecting pin 011, or the two can be inserted first and then welded.

[0107] In this embodiment, by using the aforementioned current collecting pin 011, the current collecting pin 011 neither increases the space occupied by it inside the battery, nor increases the outer surface area of the current collecting pin 011, thereby increasing the contact area between the current collecting pin 011 and the positive electrode, and further increasing the current collecting area of the current collecting pin 011. Thus, the discharge current of the lithium thionyl chloride battery using the cover plate assembly 001 is relatively large, thereby expanding the application range of the lithium thionyl chloride battery.

[0108] Please refer to Figure 7 , Figure 7 is a schematic structural diagram of another cover plate assembly 001 provided by the embodiment of the present application. In one embodiment, the cover plate assembly 001 further includes a positioning bracket 015. The positioning bracket 015 is sleeved on the pole column 013 and / or the current collecting pin 011 and is in a blocking fit with the pole column 013. The positioning bracket 015 has an abutting portion 151, and the abutting portion 151 is configured to abut against the positive electrode of the battery cell.

[0109] Among them, the positioning bracket 015 is sleeved on the pole column 013, or the positioning bracket 015 is sleeved on the current collecting pin 011, or a part of the positioning bracket 015 is sleeved on the pole column 013 and a part is sleeved on the current collecting pin 011.

[0110] It can be understood that the positive electrode expands after being impregnated with the electrolyte and also expands during the discharging process. When the height of the positive electrode exceeds that of the negative electrode 024 during expansion, on the one hand, the current collection effect deteriorates, leading to poor discharging; on the other hand, there is a risk that the positive electrode flows to the negative electrode 024, causing the battery to short-circuit.

[0111] Based on this, in this embodiment, by providing the positioning bracket 015, when the positive electrode expands, the expansion of the positive electrode can be limited, thereby ensuring the current collection effect and improving the consistency between the designed discharge capacity and the actual discharge capacity of the designed battery.

[0112] Please refer to Figure 8 , Figure 8 which is a schematic structural diagram of the bracket provided by the embodiment of the present application. In one embodiment, the positioning bracket 015 includes a socket part 152 and a resisting part 151. The socket part 152 is sleeved on the pole column 013 / current collection pin 011 and is in blocking cooperation with the pole column 013. One end of the socket part 152 facing away from the cover plate 012 is connected to the resisting part 151; the resisting part 151 extends from the socket part 152 in a direction away from the axis of the current collection pin 011.

[0113] Please refer to Figure 9 and Figure 10 , Figure 9 which is a schematic structural diagram of another cover plate assembly 001 provided by the embodiment of the present application, Figure 10 is Figure 9 the enlarged view at position F in

[0114] It can be understood that the contact part 1513 can be arranged at any position of the body 1512. For example, at the end of the body 1512 close to the socket part 152 or at the end of the body 1512 far from the socket part 152.

[0115] Among them, an upper cover film is arranged at the upper end of the positive electrode. Correspondingly, a hole or opening is arranged at the position on the upper cover film opposite to the contact part 1513 to facilitate the contact part 1513 to contact the positive electrode after passing through the upper cover film.

[0116] In this embodiment, through the above arrangement, the positioning bracket 015 can be used as a current collection component between the positive electrode and the pole column 013, thereby increasing the current collection surface between the pole column 013 and the positive electrode and enhancing the current collection effect.

[0117] Please refer to Figure 9 and Figure 10, in one embodiment, the contact portion 1513 is disposed between the body 1512 and the socket portion 152, and both ends of the contact portion 1513 are respectively connected to the body 1512 and the socket portion 152.

[0118] In this embodiment, through the above arrangement, the contact portion 1513 is disposed adjacent to the pole post 013, so that the current collection path of the contact portion 1513 can be shortened, and thus the current collection effect can be improved.

[0119] Please refer to Figure 8 , in one embodiment, the positioning bracket 015 further includes a positioning ring 153. The positioning ring 153 is located between the abutting portion 151 and the cover plate 012, and one end of the positioning ring 153 facing away from the cover plate 012 is connected to the periphery of the abutting portion 151.

[0120] It can be understood that, from the current collection pin 011 outward of the lithium thionyl chloride battery, there are in sequence a positive electrode, a side film 023, a negative electrode 024, and a housing 021. In order to improve the limit of the positioning bracket 015 on the expansion of the positive electrode, the outer diameter of the abutting portion 151 is the same as the outer diameter of the positive electrode. The outer periphery of the abutting portion 151 faces the side film 023. If the outer periphery of the abutting portion 151 is directly opposite to the side film 023, there is a possibility that the corner of the outer periphery of the abutting portion 151 scratches the side film 023.

[0121] Based on this, in this embodiment, by providing the positioning ring 153, the corner of the outer periphery of the abutting portion 151 can be prevented from directly contacting the side film 023, so that the side film 023 can be prevented from being scratched by the abutting portion 151, and thus the reliability of the battery can be improved.

[0122] Please refer to Figure 8 , Figure 8 is an enlarged view of the D portion provided in the embodiment of the present application. Figure 7 In one embodiment, the abutting portion 151 is provided with a first through hole 1511 for the flow of electrolyte.

[0123] Exemplarily, there are a plurality of first through holes 1511, and the plurality of first through holes 1511 are distributed along the circumferential and radial directions of the abutting portion 151.

[0124] In this embodiment, through the above arrangement, when the electrolyte is injected after the battery is assembled, the electrolyte can flow into the positive electrode from the first through hole 1511, which is beneficial to the infiltration of the battery.

[0125] Please refer to Figure 8 , in one embodiment, the pole post 013 has a shoulder 131, the large diameter section of the pole post 013 is located on the side of the shoulder 131 away from the positioning bracket 015, and the positioning bracket 015 abuts against the shoulder 131.

[0126] In this embodiment, by providing a shoulder 131, the positioning bracket 015 abuts against the shoulder 131, so as to realize the blocking fit between the positioning bracket 015 and the terminal post 013, thereby improving the position stability of the positioning bracket 015, and enabling the positioning bracket 015 to be stably in the position for limiting the expansion of the positive electrode.

[0127] Please refer to Figure 8 , in one embodiment, the terminal post 013 is inserted into the main body 111.

[0128] Specifically, the terminal post 013 has a shoulder 131. The small-diameter section of the terminal post 013 is located on the side of the shoulder 131 close to the main body 111. The small-diameter section is inserted into the main body 111, and the end of the main body 111 abuts against the shoulder 131.

[0129] It can be understood that conventionally, the current collector pin 011 is welded to the terminal post 013 by a resistance welding process. Specifically, a tooling is used to clamp the terminal post 013 and the current collector pin 011 respectively, and then the end faces of the two are abutted against each other, and then welded. In this process, sufficient clamping positions for the tooling need to be reserved on the terminal post 013, resulting in a relatively large height dimension of the terminal post 013, and thus occupying a relatively large space inside the battery.

[0130] Based on this, in this embodiment, the terminal post 013 is inserted into the main body 111, so that the two can be relatively fixed by insertion, and then the current collector pin 011 can be directly welded to the terminal post 013 by laser welding, without the need to reserve clamping positions for the tooling on the terminal post 013. Thus, the height dimension of the terminal post 013 is reduced, the space occupied by it inside the battery can be reduced, and more electrolyte can be filled, which is beneficial to improving the reliability of the battery.

[0131] Please refer to Figure 11 , Figure 11 is an enlarged view of the E position provided by the embodiment of the present application. Figure 6 In one embodiment, the mounting hole 121 is a two-stage stepped hole. The small-diameter section of the two-stage stepped hole is close to the main body 111. The insulating seal 014 is arranged between the hole wall of the mounting hole 121 and the terminal post 013. Both sides of the insulating seal 014 are hermetically connected to the outer peripheral surface of the terminal post 013 and the hole wall of the mounting hole 121 respectively.

[0132] It can be understood that after the battery is filled with liquid, a sealing nail 027 needs to be press-fitted into the liquid injection hole 123 on the cover plate 012. During the press-fitting, the impact force received by the cover plate 012 is relatively large. And the terminal post 013 is only fixed relative to the cover plate 012 through the sealing insulator. Therefore, when the sealing nail 027 is press-fitted, it will have an adverse effect on the seal between the terminal post 013 and the cover plate 012.

[0133] Based on this, in the present embodiment, by setting the mounting hole 121 as a secondary stepped hole, the contact area between the sealing insulator and the mounting hole 121 can be increased, thereby reducing the adverse effect on the seal between the pole column 013 and the cover plate 012 when the sealing nail 027 is press-fitted, and further improving the reliability between the pole column 013 and the cover plate 012.

[0134] In addition, the cover plate 012 is formed by stamping a metal plate with a thickness of 1 mm. In the related art, the mounting hole 121 is directly stamped into an equal-diameter hole. At this time, in order to counteract the adverse effect of the press-fitting of the sealing nail 027, a higher mounting hole 121 needs to be formed, and usually a mounting hole 121 with a height of 2 mm needs to be formed. However, forming a mounting hole 121 with a thickness of 2 mm from a cover plate 012 with a thickness of 1 mm has high process requirements and great forming difficulty. In the present embodiment, through the above settings, a mounting hole 121 with a height of 1.8 mm can be formed by stamping a metal plate with a thickness of 1 mm, which can not only obtain a cover plate assembly 001 with better sealing effect, but also reduce the forming difficulty and improve the manufacturing efficiency.

[0135] Among them, the pore diameter difference between the two hole bodies of the secondary stepped hole can be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm.

[0136] Please refer to Figure 11 , in one embodiment, the cover plate 012 is provided with a liquid injection hole 123, and a circular boss 122 is provided on the side of the cover plate 012 facing away from the current collector pin 011. The circular boss 122 is located between the liquid injection hole 123 and the pole column 013.

[0137] It can be understood that the inner diameter of the circular boss 122 is the same as the pore diameter of the side of the mounting hole 121 close to the circular boss 122. The sealing insulator extends between the circular boss 122 and the pole column 013.

[0138] As can be seen from the foregoing, press-fitting the sealing nail 027 will cause a large impact force on the cover plate 012, thereby having an adverse effect on the seal between the pole column 013 and the cover plate 012.

[0139] Based on this, in the present embodiment, by providing the circular boss 122, the influence on the seal between the pole column 013 and the cover plate 012 during nail pressing can be reduced.

[0140] Please refer to Figure 11 , in one embodiment, the cover plate 012 is a stamping part, and a first annular groove 124 is provided on the side of the cover plate 012 close to the current collector pin 011. The first annular groove 124 is disposed opposite to the circular boss 122.

[0141] It can be understood that since the cover plate 012 is a stamping part, the middle part thereof needs to be stamped into the battery interior to form a mounting hole 121 for mating with the pole post 013; and in order to form the annular boss 122, the cover plate 012 needs to have more material at the annular boss 122. Directly thickening the metal plate of the formed cover plate 012 not only results in an increase in materials but also involves many process changes.

[0142] Based on this, in this embodiment, during stamping, the downward movement of the material at the annular groove can be restricted by the limiting structure on the mold, so as to form an annular groove on the side of the cover plate 012 close to the battery cell, and form the annular boss 122 on the side of the cover plate 012 facing away from the battery interior. In this way, it can not only form an annular boss that can reduce the adverse effect of the pressure nail on the seal, but also does not need to thicken the metal plate of the formed cover plate 012, thereby controlling relevant process changes and further controlling the manufacturing cost of the cover plate 012.

[0143] Please refer to Figure 6 , in one embodiment, a boss 125 is provided on the side of the cover plate 012 close to the current collector pin 011, and the boss 125 extends along the circumferential direction of the mounting hole 121.

[0144] It can be understood that when the cover plate 012 is a stamping part, the boss 125 is formed by stamping.

[0145] In this embodiment, through the above settings, the sealing mating surface between the cover plate 012 and the pole post 013 can be increased, thereby improving the sealing reliability between the cover plate 012 and the pole post 013.

[0146] Please refer to Figure 12 , Figure 12 is a schematic structural diagram of a battery provided by an embodiment of the present application. Correspondingly, an embodiment of the present application also provides a battery. The battery includes the aforementioned current collector pin 011 or the aforementioned cover plate assembly 001.

[0147] It can be understood that the battery further includes a housing 021, a bottom film 022 disposed inside the housing 021, a side film 023, a negative electrode 024 disposed between the side film 023 and the housing 021, a positive electrode 025 disposed inside the side film 023, and an upper cover film 026 covering the top of the positive electrode. The cover plate 012 is covered on the opening of the housing 021 and is hermetically connected thereto. The current collector pin 011 is inserted into the positive electrode. After the injection of the electrolyte is completed, the injection hole 123 on the cover plate 012 is blocked by a sealing nail 027.

[0148] Wherein, the contact portion 1513 contacts the positive electrode 025 after passing through the upper cover film 026, as Figure 13 shown, Figure 13 is Figure 12 an enlarged view of the G position in

[0149] In this embodiment, by collecting the current collector pin 011 or the cover plate assembly 001 described above, the current collector pin 011 neither increases the space it occupies inside the battery nor increases the outer surface area of the current collector pin 011, so that the contact area between the current collector pin 011 and the positive electrode can be increased, and thus the current collection area of the current collector pin 011 can be increased. Thereby, the discharge current of the battery can be increased, and the application range of the battery can be expanded.

[0150] In addition, when the battery is provided with the positioning bracket 015, there is a gap between the abutting portion 151 and the positive electrode before the battery is filled with liquid. Optionally, the gap is 1 to 4 mm. For example, the gap can be 2 mm. This gap can provide a buffer space for the expansion of the infiltrated electrolyte to improve the stress states of the positioning bracket 015, the pole column 013, and the cover plate 012, thereby improving the reliability of the battery.

[0151] The embodiments of the present application have been introduced in detail above. Specific examples are used herein to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A current collector needle, characterized in that, It comprises a main body, and a groove body is arranged on the outer peripheral surface of the main body.

2. The current collector needle according to claim 1, characterized in that The groove body is extended along the circumference of the main body.

3. The current collecting needle according to claim 2, characterized in that, The groove body is an annular groove, and the axis of the annular groove is parallel to the axis of the current collecting needle.

4. The current-collecting needle according to claim 3, characterized in that, There are a plurality of annular grooves, and the plurality of annular grooves are arranged in sequence along the extending direction of the axis of the current collecting needle.

5. The current collector needle according to claim 4, characterized in that, The surface of the body between two adjacent annular grooves is a first arcuate surface, the first arcuate surface is convexly arranged away from the axis of the collecting needle, and both sides of the first arcuate surface are smoothly connected to the groove walls of the adjacent annular grooves respectively.

6. The current collecting needle according to claim 5, wherein, The bottom wall of the annular groove is a second arc-shaped surface, the second arc-shaped surface is concavely arranged close to the axis of the current collecting needle, and both sides of the second arc-shaped surface are smoothly connected to the adjacent first arc-shaped surfaces respectively.

7. The current collector needle according to claim 2, characterized in that, The groove body is a spiral groove, and the spiral center line of the spiral groove is parallel to the axis of the current collecting needle.

8. The current collector needle according to claim 7, characterized in that The groove bottom wall of the spiral groove is a third arc surface, and the third arc surface is concavely arranged close to the axis of the current collecting needle. Both sides of the third arc surface are smoothly connected to the outer peripheral surface of the body.

9. The current collector needle according to claim 8, characterized in that At least part of the outer peripheral surface of the body is a spiral surface, and the spiral surface is a fourth arc surface. The fourth arc surface is convexly arranged away from the axis of the collecting needle, and both sides of the fourth arc surface are smoothly connected to the adjacent third arc surfaces respectively.

10. The current collector needle according to any one of claims 1-9, characterized in that, The body is a hollow structure.

11. The current collector needle according to claim 10, characterized in that, The main body is a structure with uniform wall thickness.

12. The current collector needle according to claim 10, characterized in that, An upper through hole and a lower through hole communicating with the interior of the body are respectively arranged at both ends of the body.

13. The current collector needle according to any one of claims 1-9, characterized in that, The two ends of the body are respectively a top end and a bottom end, the top end is configured to be connected to the pole of the battery, and the body has a diameter-reducing section located at the bottom end, and the outer diameter of the diameter-reducing section gradually decreases in a direction away from the top end.

14. The current collector needle according to claim 13, wherein A chamfer is provided between the outer peripheral surface of the body and the end surface of the bottom end.

15. The current collector needle according to any one of claims 1-9, characterized in that, A conductive layer is provided on the outer peripheral surface of the main body and / or the inner wall of the slot body, and the conductive layer is one or more of a nickel-plated layer, a gold-plated layer, and a carbon-coated layer.

16. A cover plate assembly, characterized in that, include: A cover plate, provided with a mounting hole; A pole, passing through the mounting hole, the pole being connected to the cover plate via an insulating seal; And, in the collecting needle as described in any one of claims 1 to 15, one end of the body is connected to the pole.

17. The cover plate assembly according to claim 16, wherein The cover plate assembly also includes a positioning bracket, which is sleeved on the pole and / or the current collecting needle and cooperates with the pole to stop. The positioning bracket has a supporting portion, and the supporting portion is configured to abut against the positive electrode of the battery cell.

18. The cover plate assembly according to claim 17, wherein, The positioning bracket includes a sleeve portion and a supporting portion, the sleeve portion is sleeved on the pole and / or the current collecting needle and cooperates with the pole to stop, and the end of the sleeve portion away from the cover plate is connected to the supporting portion; the supporting portion extends from the sleeve portion in a direction away from the axis of the current collecting needle.

19. The cover plate assembly according to claim 18, characterized in that, The positioning bracket is a conductor, and the abutting portion includes a body and a contact portion protruding from a surface of the body toward the positive electrode of the battery cell, and the contact portion is configured to contact the positive electrode of the battery cell.

20. The cover plate assembly according to claim 19, wherein, The contact portion is arranged between the body and the sleeve portion, and two ends of the contact portion are respectively connected to the body and the sleeve portion.

21. The cover plate assembly according to claim 18, wherein The positioning bracket further comprises a positioning ring, wherein the positioning ring is located between the abutting portion and the cover plate, and an end of the positioning ring facing away from the cover plate is connected to the periphery of the abutting portion.

22. The cover plate assembly according to claim 17, wherein, The abutting portion is provided with a first through hole, and the first through hole is used for the flow of electrolyte.

23. The cover plate assembly according to claim 17, wherein, The pole has a shaft shoulder, the large diameter section of the pole is located at a side of the shaft shoulder away from the positioning bracket, and the positioning bracket abuts against the shaft shoulder.

24. The cover plate assembly according to any one of claims 16-23, characterized in that, The pole is plugged into the body.

25. The cover plate assembly according to claim 24, characterized in that, The pole has a shaft shoulder, a small diameter section of the pole is located on a side of the shaft shoulder close to the body, the small diameter section is inserted into the body, and an end of the body abuts against the shaft shoulder.

26. The cover plate assembly according to any one of claims 16-23, characterized in that, The mounting hole is a secondary stepped hole, the small diameter section of the secondary stepped hole is close to the body, the insulating seal is arranged between the hole wall of the mounting hole and the pole, and the two sides of the insulating seal are respectively sealed and connected to the outer peripheral surface of the pole and the hole wall of the mounting hole.

27. The cover plate assembly according to any one of claims 16-23, characterized in that, The cover plate is provided with a liquid injection hole, and a ring-shaped boss is provided on a side of the cover plate away from the current collecting needle, and the ring-shaped boss is located between the liquid injection hole and the pole.

28. The cover plate assembly according to claim 27, wherein The cover plate is a stamped part, and a first annular groove is arranged on a side of the cover plate close to the current collecting needle, and the first annular groove is arranged opposite to the annular boss.

29. The cover plate assembly according to any one of claims 16-23, characterized in that, A boss is arranged on one side of the cover plate close to the current collecting needle, and the boss is extended along the circumference of the mounting hole.

30. A battery, characterized in that, It comprises the collecting needle as described in any one of claims 1-15, or the cover plate assembly as described in any one of claims 16-29.

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