Positioning support and battery

Abstract

The utility model provides a positioning bracket and a battery, and relates to the technical field of batteries. The positioning support comprises a limiting plate, an abutting piece and a first insulating piece. A first through hole is formed in the limiting plate, and the limiting plate is configured to limit the expansion of the positive electrode of the lithium thionyl chloride battery; the abutting piece is arranged on the side, away from the positive electrode, of the limiting plate, and the abutting piece is configured to abut against the inner wall of a shell of the lithium thionyl chloride battery or abut against a center pole of the lithium thionyl chloride battery in the radial direction of the first through hole; the first insulating part is arranged on the abutting part, and the first insulating part is configured to insulate and isolate the abutting part from the part abutting against the abutting part. In the application, through the positioning bracket, after the positive pole absorbs liquid and expands to generate upward thrust on the positioning bracket, the positioning bracket can move upwards along with the expansion of the positive pole, so that the position of the positioning bracket is consistent with the height of the positive pole after completing liquid absorption and expansion; therefore, the position of the positioning bracket can be matched with the expansion height of the positive electrode after the lithium thionyl chloride battery is infiltrated.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a positioning bracket and a battery. Background Art

[0002] 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 cover plate covering the shell, a central pole penetrating the cover plate, and a positive electrode, a negative electrode, a side film, a bottom film, a cover film, etc. arranged in the shell. Among them, the positive electrode is a carbon package and the negative electrode is a lithium strip. During the use of lithium-ion battery, the positive electrode will expand due to heat, discharge, etc., which will cause poor discharge of the lithium-ion battery.

[0003] At present, the positive electrode expansion of lithium-ion battery during use is mainly limited by setting a positioning bracket above the positive electrode. After the lithium-ion battery is assembled, when the electrolyte is injected into the shell, the positive electrode will absorb liquid and expand. Therefore, when setting the positioning bracket, in order to adapt to the height of the positive electrode after absorbing liquid and expanding, the positioning bracket and the positive electrode are usually set apart to reserve space for the positive electrode to absorb liquid and expand.

[0004] However, due to the difference in the filling amount and compression degree of the positive electrode of each lithium-ion battery, the liquid absorption expansion height of the positive electrode of each lithium-ion battery is inconsistent, which in turn causes the distance between the positioning bracket and the positive electrode to not match the liquid absorption expansion height of the positive electrode. As a result, the positioning bracket is damaged by the large upward thrust of the positive electrode, or there is a gap between the positive electrode and the positioning bracket, resulting in poor discharge of the lithium-ion battery. Utility Model Content

[0005] The embodiments of the present application provide a positioning bracket and a battery, which can improve the problem of mismatch between the position of the positioning bracket and the actual liquid absorption expansion height of the positive electrode.

[0006] In the first aspect, an embodiment of the present application provides a positioning bracket, which is applied to a lithium-ion battery, and the positioning bracket includes a limit plate, a contact piece and a first insulating piece; the limit plate is provided with a first through hole, and the limit plate is configured to limit the expansion of the positive electrode of the lithium-ion battery; the contact piece is provided on the side of the limit plate away from the positive electrode, and the contact piece is configured to abut against the inner wall of the shell of the lithium-ion battery or the center pole of the lithium-ion battery along the radial direction of the first through hole; the first insulating piece is provided on the abutment piece, and the first insulating piece is configured to insulate and isolate the abutment piece from the component abutting against it.

[0007] In one embodiment, the abutment member is configured to abut against the inner wall of the shell along the radial direction of the first through hole, the abutment member is arranged on the periphery of the limiting plate, and the first insulating member is arranged on a side of the abutment member close to the inner wall of the shell.

[0008] In one embodiment, the abutment member is a cylindrical structure, one end of the abutment member is connected to the periphery of the limiting plate, and the outer wall of the abutment member is configured to abut against the inner wall of the shell along the radial direction of the first through hole.

[0009] In one embodiment, the first insulating member extends to an end of the abutting member facing away from the limiting plate.

[0010] In one embodiment, the first insulating member is an elastic insulating member.

[0011] In one embodiment, a protrusion is provided at one end of the first insulating member away from the limiting plate.

[0012] In one embodiment, the protrusion extends along the circumference of the first through hole to form an annular structure, or there are multiple protrusions, and the multiple protrusions are arranged at intervals along the circumference of the through hole.

[0013] In one embodiment, the abutment member includes a cylinder and a ring body, one end of the cylinder is connected to the periphery of the limit plate, the other end of the cylinder is provided with a second outwardly turned edge, the outer periphery of the second outwardly turned edge is connected to one end of the ring body, the ring body is sleeved on the end of the cylinder away from the limit plate, the outer wall of the ring body is configured to abut against the inner wall of the shell along the radial direction of the first through hole, and the outer wall of the ring body is provided with a first insulating member.

[0014] In one embodiment, a second through hole is provided on the second outwardly turned edge, and the first insulating member extends into the second through hole and is connected to a hole wall of the second through hole.

[0015] In one embodiment, the positioning bracket further includes a second insulating member, which is disposed on a side of the second outwardly turned edge close to the limiting plate, and is connected to a portion of the first insulating member located in the second through hole.

[0016] In one embodiment, the ring is disposed in the first insulating member.

[0017] In one embodiment, the cylinder body is a conical cylinder, and the small diameter end of the conical cylinder is arranged close to the limiting plate.

[0018] In one embodiment, a second flange is provided on the periphery of the first through hole along the axial direction of the first through hole, and the second flange is located on a side of the limiting plate close to the abutting member.

[0019] In one embodiment, the inner circumferential surface of the second flange is a conical surface, and the large diameter end of the conical surface is arranged close to the limiting plate.

[0020] In one embodiment, one end of the inner circumferential surface of the second flange close to the limiting plate is a conical surface, and the other end is a cylindrical surface.

[0021] In one embodiment, a chamfer is provided at one end of the outer peripheral surface of the first insulating member close to the limiting plate.

[0022] In one embodiment, the abutment is configured to abut against the central pole along the radial direction of the first through hole, the abutment is arranged at the periphery of the first through hole, and the first insulating member is arranged on a side of the abutment close to the central pole.

[0023] In one embodiment, the abutment is a cylindrical structure, one end of the abutment is connected to the periphery of the first through hole, the abutment is configured to be sleeved on the central pole, and the inner wall of the abutment is configured to abut the central pole along the radial direction of the first through hole.

[0024] In one embodiment, the first insulating member extends to an end of the abutting member facing away from the limiting plate.

[0025] In one embodiment, the first insulating member is an elastic insulating member.

[0026] In one embodiment, a sink is provided at one end of the first insulating member away from the limiting plate.

[0027] In one embodiment, the sinking platform is disposed around the axis of the first through hole, and the surface of the sinking platform extends to the first through hole.

[0028] In one embodiment, the outer peripheral surface of the first insulating member is a conical surface, and the small diameter end of the conical surface is arranged close to the limiting plate.

[0029] In one embodiment, a first outwardly turned edge is disposed at one end of the abutting member facing away from the limiting plate, and the first outwardly turned edge is disposed inside the first insulating member.

[0030] In one embodiment, a first flange is provided on the outer periphery of the limiting plate along the axial direction of the first through hole, and the first flange is located on a side of the limiting plate close to the abutting member.

[0031] In one embodiment, a plurality of third through holes are provided on the limiting plate.

[0032] In one embodiment, the spacing between the limiting plate and the positive electrode is configured to be no greater than 1.5 mm, and / or the spacing between the abutting member and the cover plate of the lithium-substrate battery is configured to be no less than 2.5 mm.

[0033] In the second aspect, an embodiment of the present application provides a battery, which includes a shell, a cover plate, a center pole, a core pack and the aforementioned positioning bracket; the shell has a accommodating cavity; the cover plate is covered on the shell; the center pole is penetrated by the cover plate; the core pack is arranged in the accommodating cavity, the core pack includes a bottom film, a cover film, and a positive electrode, a side film and a negative electrode arranged in sequence from the center of the shell to the outside, the bottom film is arranged on the bottom wall of the accommodating cavity, and the cover film is arranged at the end of the positive electrode away from the bottom film; wherein, the limit plate is arranged opposite to the positive electrode, and the abutment member abuts against the pole or the inner wall of the shell along the radial direction of the first through hole; the first insulating member insulates and isolates the abutment member from the component abutting against it, and the positioning bracket and the cover plate are spaced apart.

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

[0035] In the embodiment of the present application, by applying the positioning bracket to the lithium-ion battery, after the positive electrode absorbs liquid and expands to generate an upward thrust on the positioning bracket, the positioning bracket can be moved upward with the expansion of the positive electrode until the positive electrode completes the absorption and expansion. At this time, the position of the positioning bracket is consistent with the height of the positive electrode after the absorption and expansion, so that the position of the positioning bracket can be adaptively adjusted based on the expansion height of the positive electrode after the absorption and expansion, and then the position of the positioning bracket after the lithium-ion battery is infiltrated can be matched with the expansion height of the positive electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below 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 work.

[0037] Figure 1 is a schematic diagram of the structure of a positioning bracket provided in an embodiment of the present application;

[0038] Figure 2 is a structural schematic diagram of another positioning bracket provided in an embodiment of the present application;

[0039] Figure 3 yes Figure 1 The enlarged view of point A in the middle;

[0040] Figure 4 yes Figure 1 The enlarged view of point B in the middle;

[0041] Figure 5 is a schematic structural diagram of yet another positioning bracket provided in an embodiment of the present application;

[0042] Figure 6 is a schematic diagram of the structure of a battery provided in an embodiment of the present application;

[0043] Figure 7 is a schematic structural diagram of another battery provided in an embodiment of the present application;

[0044] Figure 8 It is a schematic diagram of the structure of yet another battery provided in an embodiment of the present application.

[0045] Description of reference numerals:

[0046] 001- positioning bracket;

[0047] 011-limiting plate; 111-first through hole; 112-second flange; 1121-cylindrical surface; 113-first flange; 114-third through hole;

[0048] 012-abutment member; 121-cylinder; 122-ring body; 123-second outward-turned edge; 1231-second through hole; 124-first outward-turned edge;

[0049] 013-first insulating member; 131-protrusion; 132-sunk platform; 014-second insulating member;

[0050] 002-battery; 021-shell; 022-cover plate; 023-center pole; 231-current collecting rod; 232-current collecting tube; 233-ear; 025-base film; 026-cover film; 027-positive electrode; 028-side film; 029-negative electrode. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0052] In addition, it should be understood that the specific embodiments 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 directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0053] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0054] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] See also Figure 1 or Figure 2 , Figure 1 is a schematic structural diagram of a positioning bracket 001 provided in an embodiment of the present application, Figure 2 It is a structural schematic diagram of another positioning bracket 001 provided in an embodiment of the present application. An embodiment of the present application provides a positioning bracket 001, which is applied to a lithium-ion battery. The positioning bracket 001 includes a limiting plate 011, an abutment member 012 and a first insulating member 013. The limiting plate 011 is provided with a first through hole 111, and the limiting plate 011 is configured to limit the expansion of the positive electrode of the lithium-ion battery. The abutment member 012 is provided on the side of the limiting plate 011 away from the positive electrode, and the abutment member 012 is configured to abut against the inner wall of the shell of the lithium-ion battery or the central pole of the lithium-ion battery along the radial direction of the first through hole 111. The first insulating member 013 is provided on the abutment member 012, and the first insulating member 013 is configured to insulate and isolate the abutment member 012 from the component abutting against it.

[0056] It can be understood that the first through hole 111 is used to make way for the central pole or current collector of the lithium-ion battery. When the abutting member 012 is configured to abut against the inner wall of the shell of the lithium-ion battery along the radial direction of the first through hole 111, the first insulating member 013 is located on the side of the abutting member 012 close to the inner wall of the shell, such as Figure 1 When the abutment member 012 is configured to abut against the central pole along the radial direction of the first through hole 111, the first insulating member 013 is located on the side of the abutment member 012 close to the central pole, as shown in FIG. Figure 2 shown.

[0057] Typically, a portion of lithium-ion batteries collect current through current collecting needles or current collecting rods, and the current collecting needles / current collecting rods are coaxially connected to the center pole. Another portion of lithium-ion batteries collect current through current collecting tubes, and the current collecting tubes are connected to the center pole through pole ears. Therefore, in order to avoid interference between the positioning bracket 001 and the pole ears, the positioning bracket 001 abutting the center pole is mainly used for lithium-ion batteries that collect current through current collecting needles or current collecting rods. The positioning bracket 001 abutting the inner wall of the shell of the lithium-ion battery can be applied to lithium-ion batteries that collect current through current collecting needles or current collecting rods, and can also be applied to lithium-ion batteries that collect current through current collecting tubes.

[0058] The first insulating member 013 can be glued to the abutting member 012, or can be formed on the abutting member 012 by injection molding. The limiting plate 011 and the abutting member 012 can be integrally formed, or can be welded together. The material can be, but is not limited to, stainless steel, pure nickel, stainless steel nickel-plated, cold-rolled carbon steel nickel-plated, etc. The material of the first insulating member 013 can be, but is not limited to, polytetrafluoroethylene.

[0059] In addition, the friction between the abutment member 012 and the component abutting against it is smaller than the thrust of the positive electrode on the positioning bracket 001 after the positive electrode absorbs liquid and expands. Therefore, when the electrolyte is injected, the positive electrode absorbs liquid and expands to contact the positioning bracket 001 and push the positioning bracket 001 to move.

[0060] In this embodiment, by applying the positioning bracket 001 to the lithium-ion battery, after the positive electrode absorbs liquid and expands to generate an upward thrust on the positioning bracket 001, the positioning bracket 001 can be moved upward with the expansion of the positive electrode until the positive electrode completes the absorption and expansion. At this time, the position of the positioning bracket 001 is consistent with the height of the positive electrode after the absorption and expansion, so that the position of the positioning bracket 001 can be adaptively adjusted based on the expansion height of the positive electrode after the absorption and expansion, and then the position of the positioning bracket 001 can be matched with the absorption and expansion height of the positive electrode. In this way, the positioning bracket 001 can be prevented from being damaged by the large upward thrust of the positive electrode, and the gap between the positive electrode and the positioning bracket 001 can be prevented from causing poor discharge of the lithium-ion battery.

[0061] In addition, by abutting the positioning bracket 001 against the central pole or the inner wall of the shell, the liquid absorption expansion of the positive electrode can be inhibited to a certain extent to avoid excessive expansion of the positive electrode, thereby improving the consistency between the discharge capacity of the lithium-ion battery and the actual discharge amount.

[0062] See also Figure 1 In one embodiment, when the abutting member 012 is configured to abut against the inner wall of the housing along the radial direction of the first through hole 111, the abutting member 012 is disposed on the periphery of the limiting plate 011. Accordingly, the first insulating member 013 is disposed on a side of the abutting member 012 close to the inner wall of the housing.

[0063] In this embodiment, by arranging the abutting member 012 on the periphery of the limiting plate 011 , the abutting member 012 and the limiting plate 011 can be formed by stamping at one time, thereby improving the manufacturing efficiency of the positioning bracket 001 .

[0064] See also Figure 1 In one embodiment, the abutting member 012 is a cylindrical structure. One end of the abutting member 012 is connected to the periphery of the limiting plate 011. The outer wall of the abutting member 012 is configured to abut against the inner wall of the housing along the radial direction of the first through hole 111.

[0065] Exemplarily, when applied to a lithium-ion battery, the abutment member 012 is coaxially arranged with the central pole.

[0066] In this embodiment, by setting the abutment 012 as a cylindrical structure, the abutment surfaces between the positioning bracket 001 and the lithium-ion battery can be more numerous and more symmetrical, thereby improving the stress state of the positioning bracket 001 and the shell of the lithium-ion battery, avoiding excessive stress concentration, and thus improving reliability.

[0067] See also Figure 1 In one embodiment, the first insulating member 013 extends to an end of the abutting member 012 that is away from the limiting plate 011 .

[0068] It is understandable that when the lithium-ion battery is discharged at high temperature, the positive electrode expands greatly, thereby pushing up the positioning bracket 001. When the positioning bracket 001 moves up too high, it may come into contact with the cover plate and cause a short circuit risk.

[0069] Based on this, in this embodiment, through the above arrangement, when the positioning bracket 001 is pushed up to the cover plate by the expanded positive electrode, it can be insulated and isolated from the cover plate, thereby improving reliability and facilitating normal discharge of the lithium-ion battery.

[0070] In one embodiment, the first insulating member 013 is an elastic insulating member.

[0071] In this embodiment, by setting the first insulating member 013 as an elastic insulating member, the first insulating member 013 can be compressed when the positive electrode expands and pushes up the positioning bracket 001 so that the positioning bracket 001 abuts against the cover plate. When the positive electrode of the lithium-ion battery shrinks, the positioning bracket 001 can be pushed down based on the deformation recovery force of the first insulating member 013 to return the positioning bracket 001 to maintain the limiting effect on the positive electrode. In this way, the matching of the position of the positioning bracket 001 and the height of the positive electrode can be further improved, so that the consistency between the discharge capacity and the actual discharge amount of the lithium-ion battery can be improved, and then the reliability of the lithium-ion battery can be improved.

[0072] See also Figure 3 , Figure 3 yes Figure 1 In one embodiment, a protrusion 131 is disposed at one end of the first insulating member 013 away from the limiting plate 011 .

[0073] In this embodiment, the protrusion 131 can be provided to increase the deformation of the first insulating member 013, thereby increasing the deformation recovery force of the first insulating member 013 after being compressed, thereby ensuring that the deformation recovery force of the first insulating member 013 can push the positioning bracket 001 down to a position consistent with the positive electrode height.

[0074] See also Figure 3 In one embodiment, the protrusion 131 extends along the circumference of the first through hole 111 to form an annular structure, or there are multiple protrusions 131, and the multiple protrusions 131 are arranged at intervals along the circumference of the through hole.

[0075] In this embodiment, the contact surface between the protrusion 131 and the cover plate can be increased through the above arrangement, thereby improving the stress state of the cover plate and avoiding stress concentration that may cause damage to the cover plate, thereby improving the reliability of the lithium-ion battery.

[0076] See also Figure 1In one embodiment, the abutment member 012 includes a cylinder 121 and a ring body 122. One end of the cylinder 121 is connected to the periphery of the limit plate 011. The other end of the cylinder 121 is provided with a second outwardly turned edge 123. The outer periphery of the second outwardly turned edge 123 is connected to one end of the ring body 122. The ring body 122 is sleeved on the end of the cylinder 121 away from the limit plate 011. The outer wall of the ring body 122 is configured to abut against the inner wall of the shell along the radial direction of the first through hole 111. The outer wall of the ring body 122 is provided with a first insulating member 013.

[0077] Exemplarily, the ring body 122, the cylinder body 121, the second outwardly turned edge 123 and the limiting plate 011 are integrally formed, specifically by stamping.

[0078] In this embodiment, through the above arrangement, the overall structure of the positioning bracket 001 is simple and easy to manufacture, thereby controlling the manufacturing cost of the lithium-ion battery.

[0079] See also Figure 3 In one embodiment, a second through hole 1231 is provided on the second outer edge 123. The first insulating member 013 extends into the second through hole 1231 and is connected to the hole wall of the second through hole 1231.

[0080] Since the first insulating member 013 and the abutting member 012 are made of different materials, the bonding strength therebetween is relatively weak, which may easily cause the end of the first insulating member 013 close to the first through hole 111 to separate from the abutting member 012 .

[0081] Based on this, in the present embodiment, through the above arrangement, the connection strength between the first insulating member 013 and the abutting member 012 can be enhanced, thereby improving the connection reliability between the first insulating member 013 and the abutting member 012 .

[0082] See also Figure 3 In one embodiment, the positioning bracket 001 further includes a second insulating member 014. The second insulating member 014 is disposed on a side of the second outwardly turned edge 123 close to the limiting plate 011. The second insulating member 014 is connected to a portion of the first insulating member 013 located in the second through hole 1231.

[0083] Among them, the first insulating part 013 can be made of the same material as the second insulating part 014, and both are molded on the abutment part 012 through an injection molding process. Specifically, the abutment part and the limit plate 011 that are integrally connected are first stamped out, and then placed in an injection mold, and then the mold cavity is filled with injection liquid. After the injection liquid solidifies, a positioning bracket 001 with the first insulating part 013 and the second insulating part 014 can be formed.

[0084] In this embodiment, through the above-mentioned arrangement, when one end of the first insulating member 013 close to the first through hole 111 is away from the abutment portion, the second insulating member 014 provides a pulling force for the first insulating member 013 to move away from the abutment portion, so as to limit the first insulating member 013 from moving away from the abutment portion, thereby further improving the reliability of the connection between the first insulating member 013 and the abutment portion.

[0085] See also Figure 3 In one embodiment, the ring body 122 is disposed in the first insulating member 013 .

[0086] In this embodiment, through the above arrangement, the connection surface between the first insulating member 013 and the ring body 122 can be increased, thereby improving the reliability of the connection between the ring body 122 and the first insulating member 013 to avoid separation thereof.

[0087] See also Figure 1 In one embodiment, the cylinder 121 is a conical cylinder, and the small diameter end of the conical cylinder is arranged close to the limiting plate 011.

[0088] Among them, in the longitudinal section of the cylinder 121, the angle between the conical surface of the cylinder 121 and the axis of the cylinder 121 is 2° to 5°, which can be but not limited to 2°, 2.5°, 3°, 3.1°, 3.8°, 4°, 4.7°, 5°.

[0089] In this embodiment, through the above arrangement, the positioning bracket 001 connects the limit plate 011 abutting against the positive electrode and the end abutting against the inner wall of the shell through the cylinder 121. In this way, on the one hand, the interference between the cylinder 121 and the edge film can be avoided, and on the other hand, the distance between the positioning bracket 001 and the negative electrode can be increased. In this way, the reliability of the lithium-ion battery can be improved.

[0090] See also Figure 1 In one embodiment, along the axial direction of the first through hole 111 , a second flange 112 is provided on the periphery of the first through hole 111 , and the second flange 112 is located on a side of the limiting plate 011 close to the abutting member 012 .

[0091] A chamfer, specifically a rounded chamfer, is provided at the connection between the second flange 112 and the limiting plate 011 .

[0092] It can be understood that a current collector is arranged in the middle of the lithium-ion battery. In this embodiment, by providing the second flange 112, the bracket can be positioned to contact the current collector through the second flange 112 during installation, thereby preventing the end of the first through hole 111 from scratching the current collector.

[0093] A chamfer is provided at the connection between the second flange 112 and the limiting plate 011 to guide the installation of the positioning bracket 001, so as to further reduce the scratching of the collecting tube by the positioning bracket 001 during the installation.

[0094] See also Figure 1 In one embodiment, the inner circumferential surface of the second flange 112 is a conical surface, and the large diameter end of the conical surface is arranged close to the limiting plate 011.

[0095] Among them, in the longitudinal section of the second flange 112, the angle between the inner circumference of the second flange 112 and the axis of the second flange 112 is 1° to 10°, which can be but is not limited to 1°, 2.5°, 4°, 5.1°, 6.8°, 8°, 9.7°, 10°.

[0096] In this embodiment, through the above arrangement, the guidance when installing the positioning bracket can be further improved to prevent the positioning bracket 001 from scratching the collecting tube.

[0097] See also Figure 4 , Figure 4 yes Figure 1 In one embodiment, the inner circumference of the second flange 112 is a conical surface at one end close to the stop plate 011 , and a cylindrical surface 1121 at the other end.

[0098] In this embodiment, through the above arrangement, after the positioning bracket 001 is assembled in place, the cylindrical surface 1121 fits with the current collecting tube, thereby increasing the contact surface between the positioning bracket 001 and the current collecting tube, thereby improving the stress state of the current collecting tube and avoiding local stress concentration. Thus, the reliability of the lithium-ion battery can be improved.

[0099] See also Figure 3 In one embodiment, a chamfer is provided at one end of the outer peripheral surface of the first insulating member 013 close to the limiting plate 011, specifically, a rounded chamfer.

[0100] In this embodiment, through the above-mentioned arrangement, when installing the positioning bracket 001, the installation of the positioning bracket 001 can be guided by the chamfered opening in the shell to reduce the collision and installation resistance when the positioning bracket 001 is installed into the shell, thereby improving the installation efficiency.

[0101] See also Figure 2 In one embodiment, when the abutting member 012 is configured to abut against the central pole along the radial direction of the first through hole 111, the abutting member 012 is disposed at the periphery of the first through hole 111. Accordingly, the first insulating member 013 is disposed on a side of the abutting member 012 close to the central pole.

[0102] In this embodiment, by disposing the abutting member 012 at the periphery of the first through hole 111 , the abutting member 012 and the limiting plate 011 can be formed at one time by stamping, thereby improving the manufacturing efficiency of the positioning bracket 001 .

[0103] See also Figure 2 In one embodiment, the abutment 012 is a cylindrical structure, one end of the abutment 012 is connected to the periphery of the first through hole 111, the abutment 012 is configured to be sleeved on the center pole, and the inner wall of the abutment 012 is configured to abut against the center pole along the radial direction of the first through hole 111.

[0104] In this embodiment, by setting the abutment 012 as a cylindrical structure, the abutment surfaces between the positioning bracket 001 and the lithium-ion battery can be more numerous and more symmetrical, thereby improving the stress state of the positioning bracket 001 and the shell of the lithium-ion battery, avoiding excessive stress concentration, and thus improving reliability.

[0105] See also Figure 2 In one embodiment, the first insulating member 013 extends to an end of the abutting member 012 that is away from the limiting plate 011 .

[0106] It is understandable that when the lithium-ion battery is discharged at high temperature, the positive electrode expands greatly, thereby pushing up the positioning bracket 001. When the positioning bracket 001 moves up too high, it may come into contact with the cover plate and cause a short circuit risk.

[0107] Based on this, in this embodiment, through the above arrangement, when the positioning bracket 001 is pushed up to the cover plate by the expanded positive electrode, it can be insulated and isolated from the cover plate, thereby improving reliability and facilitating normal discharge of the lithium-ion battery.

[0108] In one embodiment, the first insulating member 013 is an elastic insulating member.

[0109] In this embodiment, by setting the first insulating member 013 as an elastic insulating member, the first insulating member 013 can be compressed when the positive electrode expands and pushes up the positioning bracket 001 so that the positioning bracket 001 abuts against the cover plate. When the positive electrode of the lithium-ion battery shrinks, the positioning bracket 001 can be pushed down based on the deformation recovery force of the first insulating member 013 to return the positioning bracket 001 to maintain the limiting effect on the positive electrode. In this way, the matching of the position of the positioning bracket 001 and the height of the positive electrode can be further improved, so that the discharge capacity of the lithium-ion battery and the consistency of the actual discharge can be improved, and then the reliability of the lithium-ion battery can be improved.

[0110] See also Figure 5 , Figure 5 001 is a structural diagram of another positioning bracket 001 provided in an embodiment of the present application. In one embodiment, a sink 132 is provided at one end of the first insulating member 013 away from the limiting plate 011 .

[0111] In one embodiment, the sinking platform 132 is disposed around the axis of the first through hole 111 , and the surface of the sinking platform 132 extends to the first through hole 111 .

[0112] In this embodiment, by providing the sink 132, the thickness of the first insulating member 013 can be reduced, thereby increasing the deformation of the first insulating member 013, and further increasing the deformation recovery force of the first insulating member 013 after being compressed. Thus, it can be ensured that the deformation recovery force of the first insulating member 013 can push the positioning bracket 001 down to a position consistent with the height of the positive electrode.

[0113] See also Figure 5 In one embodiment, the outer peripheral surface of the first insulating member 013 is a tapered surface, and the small diameter end of the tapered surface is disposed close to the limiting plate 011 .

[0114] Among them, in the longitudinal section of the first insulating part 013, the angle between the outer peripheral surface of the first insulating part 013 and the axis of the first insulating part 013 is 5° to 15°, which can be but not limited to 5°, 7.5°, 8°, 9.3°, 10.8°, 12°, 13°, 15°.

[0115] In this embodiment, through the above arrangement, the deformation direction of the first insulating member 013 after being compressed is consistent, thereby improving the stress state of the first insulating member 013 after being compressed, and further improving the reliability of the positioning bracket 001.

[0116] See also Figure 5 In one embodiment, a first outwardly turned edge 124 is disposed at one end of the abutting member 012 away from the limiting plate 011 , and the first outwardly turned edge 124 is disposed inside the first insulating member 013 .

[0117] Since the first insulating member 013 and the abutting member 012 are made of different materials, the bonding strength therebetween is relatively weak, which may easily cause the first insulating member 013 to separate from the abutting member 012 .

[0118] Based on this, in the present embodiment, through the above arrangement, the connection strength between the first insulating member 013 and the abutting member 012 can be enhanced, thereby improving the connection reliability between the first insulating member 013 and the abutting member 012 .

[0119] See also Figure 5 In one embodiment, along the axial direction of the first through hole 111 , a first flange 113 is provided on the outer periphery of the limiting plate 011 , and the first flange 113 is located on a side of the limiting plate 011 close to the abutting member 012 .

[0120] A chamfer is provided at the connection between the first flange 113 and the limiting plate 011 .

[0121] It can be understood that an edge film is provided on the outside of the positive electrode of the lithium-ion battery. In this embodiment, by providing the first flange 113, the bracket can be positioned to contact the edge film through the first flange 113 during installation, thereby preventing the end of the limiting plate 011 from scratching the edge film.

[0122] A chamfer is provided at the connection between the first flange 113 and the limiting plate 011 to guide the installation of the positioning bracket 001, so as to further reduce the scratching of the edge film when the positioning bracket 001 is installed.

[0123] See also Figure 1 , Figure 2 and Figure 5 In one embodiment, a plurality of third through holes 114 are provided on the limiting plate 011 .

[0124] Exemplarily, there are multiple groups of third through holes 114 , which are evenly spaced apart in the axial direction of the first shaft hole, and each group of third through holes 114 includes multiple third through holes 114 spaced apart in the radial direction of the first through hole 111 .

[0125] In this embodiment, the third through hole 114 is provided on the limiting plate 011 so that the electrolyte of the lithium-ion battery can flow through the third through hole 114, thereby improving the fluidity of the electrolyte and further improving the reliability of the lithium-ion battery.

[0126] In one embodiment, further, the spacing between the limiting plate 011 and the positive electrode is configured to be no greater than 1.5 mm, and / or the abutment member 012 is configured to be no less than 2.5 mm from the cover plate of the lithium-ion battery.

[0127] Specifically, the limiting plate 011 is configured to have a spacing with the positive electrode of no more than 1.5 mm, or the abutment 012 is configured to have a spacing with the cover plate of the lithium-ion battery of no less than 2.5 mm, or the limiting plate 011 is configured to have a spacing with the positive electrode of no more than 1.5 mm, and the abutment 012 is configured to have a spacing with the cover plate of the lithium-ion battery of no less than 2.5 mm.

[0128] Exemplarily, the spacing between the limit plate 011 and the positive electrode includes but is not limited to: 0, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.8mm, 1mm, 0.1mm, 1.3mm, 1.5mm. The spacing between the abutment 012 and the cover of the lithium-ion battery is 2.5mm to 15mm, including but not limited to 0, 2.5mm, 2.8mm, 3.3mm, 5mm, 8mm, 10mm, 12mm, 13mm, 14mm, 15mm.

[0129] When assembling the positioning bracket 001 , the positioning bracket 001 can be brought into contact with the positive electrode, that is, the distance between the limiting plate 011 and the positive electrode is 0.

[0130] In this embodiment, through the above-mentioned limitation, on the one hand, it is possible to avoid the spacing between the limit plate 011 and the positive electrode being too large, resulting in a gap between the positive electrode and the positioning bracket 001 after the positive electrode has completed liquid absorption and expansion, thereby improving the discharge reliability of the lithium-ion battery; on the other hand, it is possible to avoid the positioning bracket 001 from abutting against the cover plate when the positive electrode has not yet completed liquid absorption and expansion, thereby improving the stress state of the cover plate.

[0131] See also Figure 6 or Figure 7 or Figure 8 , Figure 6 is a schematic diagram of the structure of the battery 002 provided in an embodiment of the present application, Figure 7 is a schematic diagram of the structure of another battery 002 provided in an embodiment of the present application, Figure 8 002 is a structural schematic diagram of another battery 002 provided by an embodiment of the present application. Accordingly, an embodiment of the present application further provides a battery 002, which includes a shell 021, a cover plate 022, a central pole 023, a core package and the aforementioned positioning bracket 001. The shell 021 has a receiving cavity. The cover plate 022 covers the shell 021. The central pole 023 is penetrated on the cover plate 022. The core package is arranged in the receiving cavity. The core package includes a bottom film 025, a cover film 026, and a positive electrode 027, a side film 028 and a negative electrode 029 arranged in sequence from the center of the shell 021 to the outside. The bottom film 025 is arranged on the bottom wall of the receiving cavity. The cover film 026 is arranged at one end of the positive electrode 027 away from the bottom film 025. Among them, the limit plate 011 is arranged opposite to the positive electrode 027. The abutment member 012 abuts against the pole or the inner wall of the shell 021 along the radial direction of the first through hole 111. The first insulating member 013 insulates and isolates the abutting member 012 from the component abutting against it, and the positioning bracket 001 is spaced apart from the cover plate 022 .

[0132] It can be understood that during assembly, the limiting plate 011 can abut against the positive electrode 027 or retain a certain gap.

[0133] The battery 002 further includes a current collecting rod 231 or a current collecting tube 232 . The current collecting rod 231 is connected to the central pole 023 . The current collecting tube 232 is connected to the central pole 023 via a pole ear 233 .

[0134] In this embodiment, by using the aforementioned positioning bracket 001, when the electrolyte is injected into the lithium-substrate battery 002 to make the positive electrode 027 absorb the electrolyte and expand, the expanded positive electrode 027 can push the positioning bracket 001 to move, so that the position of the positioning bracket 001 can be adaptively adjusted based on the expansion height of the positive electrode 027 after the electrolyte is absorbed, and then the position of the positioning bracket 001 after the lithium-substrate battery 002 is soaked can be matched with the expansion height of the positive electrode 027. In this way, the positioning bracket 001 can be prevented from being damaged by a large thrust on the positive electrode 027, and the gap between the positive electrode 027 and the positioning bracket 001 can be prevented from causing poor discharge of the lithium-substrate battery 002, thereby improving the reliability of the lithium-substrate battery 002.

[0135] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A positioning bracket, applied to lithium-ion battery, characterized in that: The positioning bracket comprises: A limiting plate, provided with a first through hole, wherein the limiting plate is configured to limit the expansion of the positive electrode of the lithium-substrate battery; an abutment member, disposed on a side of the limiting plate away from the positive electrode, the abutment member being configured to abut against an inner wall of a shell of the lithium-ion battery or a central pole of the lithium-ion battery along a radial direction of the first through hole; The first insulating member is disposed on the abutting member, and is configured to insulate and isolate the abutting member from a component abutting against the abutting member.

2. The positioning bracket according to claim 1, characterized in that: The abutment member is configured to abut against the inner wall of the shell along the radial direction of the first through hole. The abutment member is arranged on the periphery of the limiting plate. The first insulating member is arranged on a side of the abutment member close to the inner wall of the shell.

3. The positioning bracket according to claim 2, characterized in that: The abutment member is a cylindrical structure, one end of the abutment member is connected to the periphery of the limiting plate, and the outer wall of the abutment member is configured to abut against the inner wall of the shell along the radial direction of the first through hole.

4. The positioning bracket according to claim 3, characterized in that: The first insulating member extends to an end of the abutting member away from the limiting plate.

5. The positioning bracket according to claim 4, characterized in that: The first insulating member is an elastic insulating member.

6. The positioning bracket according to claim 5, characterized in that: A protrusion is arranged at one end of the first insulating member away from the limiting plate.

7. The positioning bracket according to claim 6, characterized in that: The protrusion extends along the circumference of the first through hole to form an annular structure, or there are multiple protrusions, and the multiple protrusions are arranged at intervals along the circumference of the through hole.

8. The positioning bracket according to any one of claims 2 to 7, characterized in that: The abutment member includes a cylinder and a ring body, one end of the cylinder is connected to the periphery of the limit plate, the other end of the cylinder is provided with a second outwardly turned edge, the outer periphery of the second outwardly turned edge is connected to one end of the ring body, the ring body is sleeved on the end of the cylinder away from the limit plate, the outer wall of the ring body is configured to abut against the inner wall of the shell along the radial direction of the first through hole, and the outer wall of the ring body is provided with the first insulating member.

9. The positioning bracket according to claim 8, characterized in that: A second through hole is arranged on the second outwardly turned edge, and the first insulating member extends into the second through hole and is connected to the hole wall of the second through hole.

10. The positioning bracket according to claim 9, characterized in that: The positioning bracket further includes a second insulating member, which is disposed on a side of the second outwardly turned edge close to the limiting plate, and is connected to a portion of the first insulating member located in the second through hole.

11. The positioning bracket according to claim 8, characterized in that: The ring body is arranged in the first insulating member.

12. The positioning bracket according to claim 8, characterized in that: The cylinder body is a conical cylinder, and the small diameter end of the conical cylinder is arranged close to the limiting plate.

13. The positioning bracket according to any one of claims 2 to 7, characterized in that: A second flange is provided on the periphery of the first through hole along the axial direction of the first through hole, and the second flange is located on a side of the limiting plate close to the abutting member.

14. The positioning bracket according to claim 13, characterized in that: The inner circumferential surface of the second flange is a conical surface, and the large diameter end of the conical surface is arranged close to the limiting plate.

15. The positioning bracket according to claim 14, characterized in that: The inner circumferential surface of the second flange has a conical surface at one end close to the limiting plate and a cylindrical surface at the other end.

16. The positioning bracket according to any one of claims 2 to 7, characterized in that: An end of the outer peripheral surface of the first insulating member close to the limiting plate is provided with a chamfer.

17. The positioning bracket according to claim 1, characterized in that: The abutment member is configured to abut against the central pole along the radial direction of the first through hole. The abutment member is disposed at the periphery of the first through hole. The first insulating member is disposed at a side of the abutment member close to the central pole.

18. The positioning bracket according to claim 17, characterized in that: The abutment member is a cylindrical structure, one end of which is connected to the periphery of the first through hole, the abutment member is configured to be sleeved on the central pole, and the inner wall of the abutment member is configured to abut against the central pole along the radial direction of the first through hole.

19. The positioning bracket according to claim 17, characterized in that: The first insulating member extends to an end of the abutting member away from the limiting plate.

20. The positioning bracket according to claim 19, characterized in that: The first insulating member is an elastic insulating member.

21. The positioning bracket according to claim 20, characterized in that: A sink is provided at one end of the first insulating member away from the limiting plate.

22. The positioning bracket according to claim 21, characterized in that: The sinking platform is arranged around the axis of the first through hole, and the surface of the sinking platform extends to the first through hole.

23. The positioning bracket according to claim 20, characterized in that: The outer peripheral surface of the first insulating member is a tapered surface, and the small diameter end of the tapered surface is arranged close to the limiting plate.

24. The positioning bracket according to any one of claims 17 to 23, characterized in that: A first outwardly turned edge is disposed at one end of the abutting member away from the limiting plate, and the first outwardly turned edge is disposed inside the first insulating member.

25. The positioning bracket according to any one of claims 17 to 23, characterized in that: A first flange is provided on the outer periphery of the limiting plate along the axial direction of the first through hole, and the first flange is located on a side of the limiting plate close to the abutting member.

26. The positioning bracket according to any one of claims 1-7 or 17-23, characterized in that: The limiting plate is provided with a plurality of third through holes.

27. The positioning bracket according to any one of claims 1-7 or 17-23, characterized in that: The spacing between the limiting plate and the positive electrode is configured to be no greater than 1.5 mm, and / or the spacing between the abutting member and the cover plate of the lithium-substrate battery is configured to be no less than 2.5 mm.

28. A battery, characterized in that: include: A housing having a receiving cavity; A cover plate, covering the shell; The center pole is passed through the cover plate; A core package is arranged in the accommodating cavity, the core package comprises a bottom film, a cover film, and a positive electrode, a side film and a negative electrode arranged in sequence from the center of the shell outward, the bottom film is arranged on the bottom wall of the accommodating cavity, and the cover film is arranged at one end of the positive electrode away from the bottom film; And, the positioning bracket according to any one of claims 1-27; Among them, the limiting plate is arranged opposite to the positive electrode, and the abutment member abuts against the pole or the inner wall of the shell along the radial direction of the first through hole; the first insulating member insulates and isolates the abutment member from the component abutting against it, and the positioning bracket is spaced apart from the cover plate.

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