Formation structure of cylindrical lithium battery

Abstract

The utility model relates to the technical field of battery formation devices, in particular to a formation structure of a cylindrical lithium battery, which comprises a formation cap, a connecting anode is arranged on the formation cap, an elastic fixing part is arranged at one end of the formation cap away from the connecting anode, the periphery of the elastic fixing part is connected with a metal vibrating needle, and the metal vibrating needle is connected with the connecting anode. The metal vibrating needle penetrates through the formation cap and is electrically connected to the connecting positive electrode, and the metal vibrating needle is gradually prolonged in the direction away from the connecting positive electrode. The battery formation device aims at quickly and stably completing formation of a battery.

Description

Technical Field

[0001] The utility model relates to the technical field of battery formation devices, in particular to a formation structure of a cylindrical lithium battery. Background Art

[0002] Lithium battery is an important electrical energy storage device, which is widely used in mobile phones, electric vehicles, energy storage systems and other fields. Lithium battery formation is an important process in battery production, which is used to activate the active substances in the battery and activate the lithium battery. It is electrically connected to the battery cell through the formation structure, and the battery is charged and activated for the first time after the lithium battery is filled with liquid. However, in order to improve the battery performance of the lithium battery, a BMS board will be configured in the battery, but this also makes the formation operation more complicated, and some more common formation cabinets cannot perform the formation operation quickly and stably.

[0003] In the related art, a formation cabinet is set up, and a charging rack is provided in the formation cabinet. The process can be completed by electrically connecting the charging rack to the positive and negative poles of the battery and then charging. However, if a BMS board is configured, the process will be difficult to complete smoothly due to the presence of the BMS board, and an additional formation structure needs to be installed. Utility Model Content

[0004] The main purpose of the utility model is to provide a formation structure of a cylindrical lithium battery, aiming to enable the battery to be formed quickly and stably.

[0005] To achieve the above-mentioned purpose, the utility model proposes a formation structure of a cylindrical lithium battery, including a formation cap, on which a positive electrode is connected, an elastic fixing portion is provided at one end of the formation cap away from the positive electrode, a metal spring pin is connected to the periphery of the elastic fixing portion, the metal spring pin is penetrated by the formation cap and electrically connected to the positive electrode, and the metal spring pin gradually extends in a direction away from the positive electrode.

[0006] In one embodiment of the present application, the formation cap is provided with an installation cavity facing the elastic fixing part, the elastic fixing part includes a plurality of groups of inverted positions, and the plurality of groups of inverted positions are connected to the outer wall of the installation cavity at circumferentially uniform intervals, the formation cap is provided with a protective part facing the elastic fixing part, the protective part is wrapped around the periphery of the elastic fixing part, and the metal spring pin is penetrated through the protective part.

[0007] In one embodiment of the present application, the undercut position includes a reinforcement portion, a deformation portion and a buckling portion:

[0008] The reinforcing portion is connected to the inner wall of the protecting portion and surrounds the bottom edge of the mounting cavity;

[0009] The deformation portion is connected to the reinforcement portion and gradually extends in a direction away from the protection portion; and

[0010] The buckling portion is connected to an end of the deformation portion away from the reinforcement portion, and the buckling portion is convexly arranged at an end of the buckling portion facing the installation cavity.

[0011] In one embodiment of the present application, the protection portion and the elastic fixing portion are coaxially arranged, the inner wall of the protection portion and the outer wall of the undercut position enclose a protection space, and the metal elastic pin is inserted into the protection space.

[0012] In one embodiment of the present application, the protection portion also includes a support position, and the support position is provided in a plurality of groups. The plurality of groups of support positions are evenly spaced circumferentially around the outer wall of the mounting cavity. The support position is located between two adjacent inverted positions and is spaced apart from the inverted positions. The support position is protruding from the protection space.

[0013] In one embodiment of the present application, the horizontal height of the supporting position is the same as the horizontal height of the undercut position, the metal spring pin is penetrated through one of the supporting positions, the supporting position is wrapped around the metal spring pin, and the horizontal height of the end of the metal spring pin away from the fixing portion is lower than the horizontal heights of the supporting position and the undercut position.

[0014] In one embodiment of the present application, the formation cap is provided with a connecting portion facing the connecting positive electrode, the connecting portion is connected to the connecting positive electrode, and the metal spring pin is clamped on the connecting portion.

[0015] In one embodiment of the present application, the positive electrode of the battery body is clamped to the elastic fixing part, a battery cell is arranged in the battery body, a BMS component is arranged between the positive electrode of the battery body and the battery cell, the BMS component is provided with a formation hole facing the metal spring pin, the metal spring pin is penetrated through the formation hole, and is electrically connected to the battery cell.

[0016] The technical solution of the present utility model is that in order to enable a lithium battery internally configured with a BMS component to be formed quickly and stably, a forming cap is correspondingly provided for the lithium battery. The diameter of the forming cap is less than or equal to the diameter of the lithium battery. In this way, when the forming cap is installed on the lithium battery, it will not increase the volume and height significantly, and it is more convenient to perform the forming. The top of the forming cap is provided with a connecting positive electrode, and the connecting positive electrode is a whole metal sheet, which is beneficial for a forming cabinet or other similar forming devices to connect to the forming cap. The back of the forming cap is provided with an elastic fixing part. The main function of the elastic fixing part is to fix the lithium battery to prevent the forming cap from falling off during the forming process and causing harm. The elastic fixing part can be an installation groove opened at the bottom of the forming cap, and elastic metal strips are arranged side by side in the installation groove. The adjacent elastic metal strips can be used to fix the positive electrode of the battery, and the outer wall of the installation groove cooperates with the metal strips to make the forming cap placed more stably. Metal spring pins are provided on the periphery of the elastic fixing part. The installation groove can isolate the positive electrode of the battery from the metal spring pins to prevent the BMS component from being energized when the battery is not activated, resulting in damage. The metal spring pins can penetrate through the lithium battery and connect the connecting positive electrode to the lithium battery, enabling the lithium battery to be formed quickly and stably while protecting the BMS component. Brief Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0018] Figure 1 It is a schematic structural diagram of an embodiment of the forming structure of a cylindrical lithium battery of the present utility model;

[0019] Figure 2 It is Figure 1 a partial enlarged view of part A in

[0020] Figure 3 It is a schematic structural diagram of the forming cap of an embodiment of the forming structure of a cylindrical lithium battery of the present utility model;

[0021] Figure 4 It is a bottom view of the forming cap of an embodiment of the forming structure of a cylindrical lithium battery of the present utility model.

[0022] Explanation of the reference numerals in the drawings:

[0023] 1. Formation cap; 11. Connecting positive electrode; 12. Connecting part; 13. Mounting cavity; 2. Elastic fixing part; 21. Inverted position; 22. Reinforcement part; 23. Deformation part; 24. Snap-fit ​​part; 3. Protection part; 31. Support position; 32. Protection space; 4. Metal spring pin; 5. Battery body; 51. Battery cell; 52. BMS component; 53. Formation hole.

[0024] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] Reference Figures 1 to 4 In one embodiment of the utility model, a formation structure of a cylindrical lithium battery is proposed, including a formation cap 1, a positive electrode 11 is provided on the formation cap 1, an elastic fixing portion 2 is provided at one end of the formation cap 1 away from the positive electrode 11, a metal elastic pin 4 is connected to the periphery of the elastic fixing portion 2, the metal elastic pin 4 is penetrated by the formation cap 1, and is electrically connected to the positive electrode 11, and the metal elastic pin 4 gradually extends in a direction away from the positive electrode 11.

[0027] In a formation structure of a cylindrical lithium battery of the present application, in order to enable the lithium battery with a BMS component 52 configured therein to be formed quickly and stably, a formation cap 1 is provided in conjunction with the corresponding lithium battery, and the diameter of the formation cap 1 is less than or equal to the diameter of the lithium battery, so that when the formation cap 1 is installed on the lithium battery, the volume and height will not be increased much, and the formation can be carried out more conveniently. A connection positive electrode 11 is provided on the top of the formation cap 1, and the connection positive electrode 11 is a whole piece of metal sheet, which can facilitate the connection of the formation cabinet or other similar formation devices to the formation cap 1. An elastic fixing portion 2 is provided on the back of the formation cap 1. The main function of the elastic fixing portion 2 is to fix the lithium battery and prevent the formation cap 1 from To prevent the battery from falling off during the formation process and causing harm, the elastic fixing part 2 can be a mounting groove opened at the bottom of the formation cap 1, and elastic metal strips are inserted side by side in the mounting groove. The adjacent elastic metal strips can be used to fix the positive electrode of the battery, and the outer wall of the mounting groove cooperates with the metal strip to make the formation cap 1 more stably placed. A metal elastic pin 4 is provided on the periphery of the elastic fixing part 2, and the mounting groove can isolate the positive electrode of the battery and the metal elastic pin 4 to prevent the BMS component 52 from being powered on when the battery is not activated, causing damage. The metal elastic pin 4 can be inserted into the lithium battery and connect the positive electrode 11 to the lithium battery, so that the lithium battery can be quickly and stably formed while protecting the BMS component 52.

[0028] Combined with referenceFigures 2 to 4 In an embodiment of the present application, the formation cap 1 is provided with an installation cavity 13 facing the elastic fixing portion 2. The elastic fixing portion 2 includes multiple sets of reverse buckling positions 21. The multiple sets of reverse buckling positions 21 are circumferentially and evenly spaced and connected to the outer wall of the installation cavity 13. The formation cap 1 is provided with a protection portion 3 facing the elastic fixing portion 2. The protection portion 3 surrounds the periphery of the elastic fixing portion 2. The metal spring pin 4 is inserted through the protection portion 3.

[0029] In the formation structure of a cylindrical lithium battery of the present application, the formation cap 1 is provided with an installation cavity 13 facing the elastic fixing portion 2. The setting of the installation cavity 13 can deepen the space enclosed by the elastic fixing portion 2. Such a structure enables the installation cavity 13 to completely surround the positive end of the lithium battery, making the structure more versatile. In this embodiment, the elastic fixing portion 2 is composed of multiple sets of reverse buckling positions 21, which are circumferentially spaced and surround the outer wall of the installation cavity 13. When inserted, the reverse buckling positions 21 deform. After the battery positive electrode extends into the installation cavity 13, the reverse buckling positions 21 reset and firmly grip the battery positive electrode to achieve the purpose of locking. A protection portion 3 is provided on the outer edge of the elastic fixing portion 2, which can cover the bottom of the reverse buckling positions 21 to prevent them from directly connecting to the outside, making the structure prone to damage. At the same time, the protection portion 3 can also protect the bottom edge of the metal spring pin 4. The metal spring pin 4 itself is a spring pin structure and can extend into the battery to conduct charging by avoiding the battery positive electrode.

[0030] Referring to Figures 2 to 4 In an embodiment of the present application, the reverse buckling position 21 includes a strengthening portion 22, a deformation portion 23, and a buckling portion 24. The strengthening portion 22 is connected to the inner wall of the protection portion 3 and surrounds the bottom edge of the installation cavity 13; the deformation portion 23 is connected to the strengthening portion 22 and gradually extends in a direction away from the protection portion 3; the buckling portion 24 is connected to the end of the deformation portion 23 away from the strengthening portion 22, and the buckling portion 24 protrudes from the end of the buckling portion 24 facing the installation cavity 13.

[0031] In the formation structure of a cylindrical lithium battery of the present application, the reverse buckling position 21 includes a strengthening portion 22, a deformation portion 23, and a buckling portion 24. The horizontal height of the bottom end of the protection portion 3 is lower than the top of the installation cavity 13. In this way, while the installation cavity 13 can be deeper, the installation cavity 13 and the protection portion 3 together form the strengthening portion 22 of the reverse buckling position 21, avoiding damage to the structure of the reverse buckling position 21 after multiple disassembly / assembly operations. The deformation portion 23 is connected to the strengthening portion 22 and tightens the battery by deforming and storing energy, making the formation operation smoother and more stable. The buckling portion 24 can buckle and grip the battery positive electrode with the help of the deformation portion 23 to prevent it from loosening. The horizontal heights of the multiple sets of reverse buckling positions 21 are the same, which can form a stable platform, making the entire process more stable and facilitating the installation of the formation cap 1.

[0032] Referring to Figure 4In one embodiment of the present application, the protection portion 3 and the elastic fixing portion 2 are coaxially arranged, the inner wall of the protection portion 3 and the outer wall of the undercut position 21 enclose a protection space 32 , and the metal elastic pin 4 is inserted into the protection space 32 .

[0033] In a formation structure of a cylindrical lithium battery of the present application, the protection part 3 and the elastic fixing part 2 are coaxially arranged, so that the forces on each structure can be stabilized after the formation cap 1 is installed. In the present embodiment, the protection part 3 is an annular protrusion, which is wrapped around the outer wall of the elastic fixing part 2 and encloses a protection space 32 together with the elastic fixing part 2. The connecting positive electrode 11 of the formation cap 1 is placed squarely on the table. At this time, the horizontal height of the protection space 32 is higher than the installation cavity 13.

[0034] Combined with reference Figure 4 In one embodiment of the present application, the protection portion 3 also includes a support position 31, and a plurality of support positions 31 are provided. The plurality of support positions 31 are evenly spaced circumferentially around the outer wall of the mounting cavity 13. The support position 31 is located between two adjacent inverted positions 21 and is spaced apart from the inverted positions 21. The support position 31 is protruded from the protection space 32.

[0035] In a formation structure of a cylindrical lithium battery of the present application, the protection portion 3 also includes a support position 31. In the present embodiment, the projection of the support position 31 is a fan ring, and the support position 31 is located between adjacent inverted positions 21, which can make the installation of the formation cap 1 more stable. The connected positive electrode 11 of the formation cap 1 is placed squarely on the table. At this time, the horizontal height of the formation cap 1 can be slightly higher than the inverted position 21, so that the support of the entire formation cap 1 is only supported by the support position 31. When the positive electrode structure of the lithium battery is uneven, it can make the installation more convenient. The outer wall of the formation cap 1 is connected to the protection portion 3, which can make the overall structure more solid.

[0036] Combined with reference Figures 2 to 4 In one embodiment of the present application, the horizontal height of the support position 31 is the same as the horizontal height of the undercut position 21, the metal elastic pin 4 is penetrated through a support position 31, the support position 31 is wrapped around the metal elastic pin 4, and the horizontal height of the end of the metal elastic pin 4 away from the fixing portion is lower than the horizontal heights of the support position 31 and the undercut position 21.

[0037] In a formation structure of a cylindrical lithium battery of the present application, a metal spring pin 4 is inserted into a support position 31, and the support position 31 is clamped on the metal spring pin 4. When the metal spring pin 4 is inserted into the battery, the support position 31 can not only stabilize the formation cap 1, but also make the metal spring pin 4 work more stably, thereby improving the formation efficiency. In this embodiment, the horizontal height of the support position 31 is the same as the horizontal height of the inverted position 21, and the horizontal height of the end of the metal spring pin 4 is lower than the inverted position 21 and the support position 31, so that the metal spring pin 4 can be smoothly inserted into the battery after installation.

[0038] Refer to Figures 2 to 3 , in an embodiment of the present application, the formation cap 1 is provided with a connecting portion 12 facing the connecting positive electrode 11. The connecting portion 12 is connected to the connecting positive electrode 11, and the metal spring pin 4 is clamped to the connecting portion 12.

[0039] In a formation structure of a cylindrical lithium battery of the present application, the formation cap 1 is provided with a connecting portion 12 facing the connecting positive electrode 11. Through the arrangement of the connecting portion 12, after the formation cap 1 and the battery are assembled, the external formation assembly can be connected through the connecting portion 12, improving the rate of installing / dismantling the formation device.

[0040] Refer to Figures 1 to 2 , in an embodiment of the present application, the positive electrode of the battery body 5 is clamped to the elastic fixing portion 2. The battery body 5 is provided with an electric core 51. A BMS component 52 is provided between the positive electrode of the battery body 5 and the electric core 51. The BMS component 52 is provided with a formation hole 53 facing the metal spring pin 4. The metal spring pin 4 passes through the formation hole 53 and is electrically connected to the electric core 51.

[0041] In a formation structure of a cylindrical lithium battery of the present application, the battery body 5 internally has an electric core 51. The BMS component 52 is arranged between the electric core 51 and the battery positive electrode. The BMS component 52 is provided with a formation hole 53, enabling the metal spring pin 4 to pass through the formation hole 53 and directly power the electric core 51, avoiding possible damage to components. During the formation process, the positive electrode of the formation cabinet directly leads to the electric core 51 without passing through chip control, making the formation process safer and faster.

[0042] In the drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present application, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0043] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A formation structure of a cylindrical lithium battery, comprising a formation cap, characterized in that: The formation cap is provided with a positive electrode connection, and an elastic fixing portion is provided at one end of the formation cap away from the positive electrode connection, and a metal elastic pin is connected to the periphery of the elastic fixing portion. The metal elastic pin is inserted into the formation cap and electrically connected to the positive electrode connection, and the metal elastic pin gradually extends in a direction away from the positive electrode connection; The formation cap is provided with an installation cavity facing the elastic fixing part, the elastic fixing part includes a plurality of groups of undercut positions, and the plurality of groups of undercut positions are connected to the outer wall of the installation cavity at evenly spaced intervals in the circumferential direction. The formation cap is provided with a protection part facing the elastic fixing part, the protection part is wrapped around the periphery of the elastic fixing part, and the metal spring pin is penetrated through the protection part.

2. A cylindrical lithium battery formation structure according to claim 1, characterized in that: The undercut position comprises: A reinforcing portion, the reinforcing portion being connected to an inner wall of the protecting portion and surrounding a bottom edge of the mounting cavity; a deformation portion, the deformation portion being connected to the reinforcement portion and gradually extending in a direction away from the protection portion; and The buckling portion is connected to the end of the deformation portion away from the reinforcement portion, and the buckling portion is convexly arranged at the end of the buckling portion facing the installation cavity.

3. The formation structure of a cylindrical lithium battery according to claim 1, characterized in that: The protection part and the elastic fixing part are coaxially arranged, the inner wall of the protection part and the outer wall of the undercut position are enclosed to form a protection space, and the metal elastic pin is inserted into the protection space.

4. A cylindrical lithium battery formation structure according to claim 3, characterized in that: The protection part also includes a support position, which is provided in multiple groups. The multiple groups of support positions are evenly spaced circumferentially around the outer wall of the installation cavity. The support position is located between two adjacent inverted positions and is spaced apart from the inverted positions. The support position is protruding from the protection space.

5. A cylindrical lithium battery formation structure according to claim 4, characterized in that: The horizontal height of the support position is the same as that of the undercut position. The metal elastic pin is inserted into one of the support positions. The support position is wrapped around the metal elastic pin. The horizontal height of the end of the metal elastic pin away from the fixing portion is lower than the horizontal heights of the support position and the undercut position.

6. The formation structure of a cylindrical lithium battery according to claim 1, characterized in that: The formation cap is provided with a connection portion facing the connection positive electrode, the connection portion is connected to the connection positive electrode, and the metal spring pin is clamped on the connection portion.

7. The formation structure of a cylindrical lithium battery according to claim 1, characterized in that: The positive electrode of the battery body is clamped on the elastic fixing part, a battery cell is arranged in the battery body, a BMS component is arranged between the positive electrode of the battery body and the battery cell, the BMS component is provided with a formation hole facing the metal spring needle, the metal spring needle is penetrated through the formation hole and is electrically connected to the battery cell.

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