Battery positive electrode structure and battery

Abstract

The utility model provides a battery positive electrode structure and a battery. The battery positive electrode structure comprises a pole through hole formed in a positive electrode end of a battery shell, and a positive electrode piece, the positive pole piece is integrally formed by a positive pole column and a positive pole collector plate, the positive pole collector plate is arranged in the battery shell and is in insulated connection with the battery shell, and the positive pole column extends out of the battery shell from the pole column through hole and is in sealed connection with the positive pole end; a deformation part is arranged on the positive pole, the deformation part deforms under stress and forms a crimping convex edge, and the crimping convex edge is pressed on the positive pole end. According to the battery positive electrode structure disclosed by the utility model, the positive electrode piece integrally formed by the positive electrode column and the positive electrode collector plate is adopted, and the deformation part on the positive electrode column can be deformed to form the crimping convex edge pressed on the positive electrode end, so that the assembly of the positive electrode piece and the battery shell is facilitated, the assembly difficulty can be reduced, and the product yield can be improved; and the realization of mass production requirements of products is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery manufacturing, and in particular to a battery positive electrode structure. The utility model also relates to a battery provided with the battery positive electrode structure. Background Art

[0002] In the full-tab battery structure, the battery draws current directly from the current collecting plates on the positive and negative electrodes. This structure can greatly increase the current path, shorten the tab spacing, and significantly increase the battery power, so that the full-tab battery has the advantages of strong current capacity, low heat generation, and low internal resistance.

[0003] The full-ear battery on the market currently has a complex structure, many production processes, and high costs. In addition, since the cylindrical full-ear current collector needs to be welded to the positive electrode collector and the positive pole of the shell inside the cylinder or even inside the battery cell, this assembly process has high requirements, the assembly process accuracy is difficult to ensure, the yield is poor, the welding results are difficult to visually detect, and risky products are easy to flow out, resulting in the inability to effectively mass-produce the full-ear positive closed cylindrical current collector and pole connection assembly. Utility Model Content

[0004] In view of this, the utility model aims to provide a battery positive electrode structure to reduce the difficulty of assembling the battery positive electrode and improve the product yield.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A battery positive electrode structure, comprising a pole through hole provided on a positive terminal of a battery shell, and a positive electrode member;

[0007] The positive electrode component is integrally formed by a positive electrode column and a positive current collecting disk, the positive electrode collecting disk is arranged inside the battery shell and is insulated and connected to the battery shell, the positive electrode column extends from the electrode column through hole to the outside of the battery shell, and the positive electrode column is sealed and connected to the positive terminal; a deformation portion is provided on the positive electrode column, the deformation portion is deformed by force and forms a crimping convex edge, and the crimping convex edge is pressed on the positive terminal.

[0008] Furthermore, a sealing ring is provided between the positive pole and the pole through hole, and the sealing ring is sleeved on the positive pole and is connected to the pole through hole by snap-fitting.

[0009] Furthermore, a slot is provided on the circumference of the upper ring of the sealing ring, and the edge of the positive terminal located at the pole through hole is snapped into the slot.

[0010] Furthermore, the thickness b of the sealing ring satisfies: 0.5mm≤b≤0.6mm.

[0011] Furthermore, a first plastic part is provided between the positive electrode current collecting disk and the positive terminal; and / or a second plastic part is provided between the crimping protrusion and the positive terminal.

[0012] Furthermore, a first threaded hole and a second threaded hole are coaxially arranged in the positive electrode column, the first threaded hole is arranged close to the positive electrode current collecting plate, and the aperture of the first threaded hole is smaller than the aperture of the second threaded hole.

[0013] Furthermore, the deformation portion is in a circular ring shape, and a distance a between an upper edge of the deformation portion and an outer end surface of the positive terminal satisfies: 3mm≤a≤5mm.

[0014] Furthermore, a distance c between the upper end surface of the positive electrode current collecting disk and the inner end surface of the positive electrode terminal satisfies: 0.5 mm ≤ c ≤ 0.6 mm.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The battery positive electrode structure described in the utility model adopts a positive electrode member formed of a positive electrode column and a positive electrode current collecting disk in one piece, and the deformation portion on the positive electrode column forms a crimping convex edge pressed on the positive terminal after being deformed by force, thereby facilitating the assembly of the positive electrode member and the battery shell. Compared with the welding and assembly method of the positive electrode column and the current collecting disk in the battery shell in the prior art, the assembly difficulty can be greatly reduced, the product yield rate can be improved, and it is also conducive to the realization of product mass production needs, and at the same time has a very good use effect.

[0017] In addition, the sealing ring arranged between the positive pole and the pole through hole can ensure the sealing effect between the positive terminal of the battery shell and the positive pole, and the sealing ring is sleeved on the positive pole and connected with the pole through hole, which has the characteristics of simple structure and easy installation. The circumferentially arranged card groove of the sealing ring is conducive to the sealing ring being clamped on the edge of the positive terminal at the pole through hole, thereby ensuring the reliability of the sealing ring installation.

[0018] Secondly, the limitation of the thickness of the sealing ring can further provide a better seal between the battery housing and the positive electrode column. The first plastic part can ensure the insulation connection between the positive current collector and the positive terminal, and the second plastic part can ensure the insulation connection between the crimping convex edge and the positive terminal. The provision of the first threaded hole and the second threaded hole can facilitate the use of riveting to deform the deformation part on the positive electrode column and form a crimping convex edge fixed to the positive terminal of the battery housing.

[0019] In addition, the first threaded hole is arranged close to the positive electrode current collecting plate, so that when the screw tool is connected to the first threaded hole, it is fixed on the inner side of the positive terminal, and through the connection between the screw tool and the second threaded hole, it is fixed on the outer side of the positive terminal and squeezed, so that the deformation part is deformed to form a crimping convex edge.

[0020] In addition, the limitation of the distance between the upper edge of the deformation part and the outer end face of the positive terminal can ensure the effective crimping size and strength of the crimping convex edge when the deformation part is squeezed, and further ensure the installation reliability of the positive electrode. The limitation of the distance between the upper end face of the positive current collector and the inner end face of the positive terminal can prevent the positive terminal from falling off and deforming at the position of the pole through hole when the deformation part is riveted and collapsed.

[0021] Another object of the present invention is to provide a battery, wherein the battery is provided with the above-mentioned battery positive electrode structure.

[0022] Furthermore, the battery also includes a wound battery cell and a negative electrode member disposed in the battery shell;

[0023] The positive electrode and the negative electrode at both ends of the wound battery core are electrically connected to the positive electrode member and the negative electrode member respectively.

[0024] The battery of the utility model, by adopting the battery positive electrode structure as described above, can reduce the difficulty of battery assembly, ensure the battery production yield, and is also conducive to the quantitative production of batteries, and has a good use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0026] Figure 1 A cross-sectional view of a positive electrode structure of a battery according to an embodiment of the utility model;

[0027] Figure 2 It is a schematic structural diagram of the positive electrode member according to an embodiment of the utility model;

[0028] Figure 3 It is a structural schematic diagram of the positive electrode assembly state according to the embodiment of the utility model;

[0029] Description of reference numerals:

[0030] 1. Battery case; 2. Positive electrode; 3. First plastic part; 4. Sealing ring; 5. Second plastic part;

[0031] 11. Positive terminal; 111. Post through hole; 21. Positive post; 22. Positive current collecting plate; 210. Deformation portion; 211. First threaded hole; 212. Second threaded hole; 221. Protrusion. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0033] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" 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 or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0036] Embodiment 1

[0037] The present embodiment relates to a battery positive electrode structure, which can reduce the difficulty of assembling the battery positive electrode, improve the product yield, and also facilitate the realization of product mass production requirements.

[0038] In terms of overall composition, Figure 1 As shown, the positive electrode structure of the battery in this embodiment includes a pole through hole 111 provided on the positive terminal 11 of the battery shell 1, and a positive electrode member 2. Figure 2 and Figure 3 As shown, the positive electrode member 2 is integrally formed by a positive electrode column 21 and a positive current collecting disk 22. The positive current collecting disk 22 is arranged inside the battery shell 1 and is insulated and connected to the battery shell 1. The positive electrode column 21 extends from the electrode column through hole 111 to the outside of the battery shell 1, and the positive electrode column 21 is sealed and connected to the positive terminal 11; a deformation portion 210 is provided on the positive electrode column 21, and the deformation portion 210 is deformed by force to form a crimping convex edge, which is pressed on the positive terminal 11.

[0039] At this time, the positive electrode member 2 adopts a structure in which the positive electrode column 21 and the positive electrode current collecting disk 22 are integrally formed, and the deformation portion 210 on the positive electrode column 21 forms a crimping convex edge pressed on the positive terminal 11 after being deformed by force. Compared with the prior art in which the positive electrode column 21 and the positive electrode current collecting disk 22 adopt a split structure, and when assembling, the positive electrode column 21 and the positive electrode current collecting disk 22 are welded and assembled in the battery shell 1, it is convenient to assemble the positive electrode member 2 with the battery shell 1, and can greatly reduce the difficulty of assembly, and it is also conducive to testing the quality of the positive electrode member 2 and the battery shell 1 after assembly, thereby improving the product yield and also facilitating the realization of the demand for mass production of products.

[0040] For more details, see Figures 1 to 3 As shown, as a preferred embodiment, in this embodiment, one end of the battery shell 1 is open to form a negative electrode segment, and the other end is sealed to form a positive terminal 11, and a pole through hole 111 is opened on the positive terminal 11. The positive pole 21 and the positive current collecting disc 22 are formed in one body and constitute a positive pole member 2, and the positive pole member 2 is installed at the positive terminal 11 of the battery shell 1.

[0041] Specifically, the positive electrode member 2 is installed inside the battery shell 1. After installation, the positive electrode collector 22 is located inside the battery shell 1 and is insulated and connected to the battery shell 1. A plurality of protrusions 221 are formed on the positive electrode collector 22, and the plurality of protrusions 221 are arranged along the circumference of the positive electrode collector 22. The arrangement of the plurality of protrusions 221 can increase the electrolyte infiltration effect in the battery shell 1.

[0042] The positive electrode column 21 extends from the electrode column through hole 111 to the outside of the battery shell 1, and the positive electrode column 21 is sealed and connected to the positive terminal 11. In order to ensure the sealing effect between the positive electrode column 21 and the positive terminal 11 of the battery shell 1, in this embodiment, as a preference, a sealing ring 4 is provided between the positive electrode column 21 and the electrode column through hole 111, and the sealing ring 4 is sleeved on the positive electrode column 21 and connected to the electrode column through hole 111 by snapping.

[0043] As a preferred implementation form, in this embodiment, a clamping groove is provided on the upper ring of the sealing ring 4 in the circumferential direction, and the edge of the positive terminal 11 at the pole through hole 111 is clamped in the clamping groove. At this time, the clamping of the edge at the pole through hole 111 and the clamping groove can make the installation of the sealing ring 4 more convenient, and can also ensure the reliability of the sealing ring 4 after installation.

[0044] In this embodiment, the thickness of the positive terminal 11 is approximately 0.4 mm. And as a further preferred embodiment, in this embodiment, the thickness b of the sealing ring 4 satisfies: 0.5 mm ≤ b ≤ 0.6 mm. Such a configuration allows both sides of the card slot on the sealing ring 4 to be well fitted on the edge of the pole through hole 111, and can further ensure the sealing effect between the battery shell 1 and the positive pole 21. And in a specific implementation, the thickness b of the sealing ring 4 can be set to 0.5 mm, 0.55 mm or 0.6 mm, for example.

[0045] In order to ensure the insulation connection between the positive electrode member 2 and the positive terminal 11 of the battery shell 1, in this embodiment, see Figure 1 As shown, a first plastic part 3 is provided between the positive current collecting disc 22 and the positive terminal 11, and a second plastic part 5 is also provided between the crimping convex edge and the positive terminal 11. At this time, the provision of the first plastic part 3 can ensure the insulation connection between the positive current collecting disc 22 and the positive terminal 11, and the provision of the second plastic part 5 can ensure the insulation connection between the crimping convex edge and the positive terminal 11.

[0046] In this embodiment, the deformation portion 210 provided on the positive electrode column 21 is, as a preferred implementation form, an annular structure, and the thickness of the deformation portion 210 is slightly thinner than the wall thickness of the rest of the positive electrode column 21, so as to facilitate deformation and collapse. Moreover, the distance a between the upper edge of the deformation portion 210 and the outer end face of the positive terminal 11 satisfies: 3mm≤a≤5mm. At this time, the limitation of the distance between the upper edge of the deformation portion 210 and the outer end face of the positive terminal 11 can ensure the effective crimping size and clamping strength of the deformation portion 210 extruded into the crimping convex edge, and further ensure the installation reliability of the positive electrode member 2. Moreover, in a specific implementation, the distance a can be set to, for example, 3mm, 4mm or 5mm.

[0047] It is worth noting that, in addition to adopting a circular ring-shaped structure, the deformation portion 210 of this embodiment can also be set to a structure in which multiple collapse holes are formed in the circumferential direction of the positive electrode column 21. Through the action of external force, the deformation portion 210 can collapse and deform to form a clamping ridge pressed on the positive terminal 11. This is also feasible.

[0048] In this embodiment, as a preference, the distance c between the upper end surface of the positive current collecting disk 22 and the inner end surface of the positive terminal 11 satisfies: 0.5mm≤c≤0.6mm. In this way, when the deformation portion 210 is riveted and collapsed, the portion of the positive terminal 11 located at the pole through hole 111 can be prevented from falling off and deforming. In a specific implementation, the distance c value can be set to 0.5mm, 0.55mm or 0.6mm, for example.

[0049] In addition, as a preferred embodiment, in this embodiment, a coaxially arranged first threaded hole 211 and a second threaded hole 212 are provided in the positive electrode column 21. The first threaded hole 211 is provided close to the positive electrode current collecting plate 22, and the aperture of the first threaded hole 211 is smaller than the aperture of the second threaded hole 212. At this time, the first threaded hole 211 and the second threaded hole 212 are provided, which is conducive to the use of riveting to make the deformation part 210 on the positive electrode column 21 deformed by force and form a crimping convex edge to be fixed to the positive terminal 11 of the battery shell 1.

[0050] Moreover, the first threaded hole 211 is arranged close to the positive electrode current collecting plate 22, so that when the first screw in the screw tool is connected to the first threaded hole 211, it can be fixed on the inner side of the positive terminal 11. Then, by connecting the second hollow screw sleeved on the first screw in the screw tool with the second threaded hole 212, the outer side of the positive terminal 11 is also fixed. Then, by the relative movement of the first screw and the second screw, the deformation part 210 is squeezed and collapsed, and a crimping convex edge is formed to be pressed tightly on the positive terminal 11.

[0051] The positive electrode structure of the battery of this embodiment, when specifically assembled, firstly, the first plastic part 3 is sleeved on the positive electrode column 21 of the positive electrode part 2, then the sealing ring 4 is clamped in the through hole 111 of the electrode column, and then the positive electrode part 2 sleeved with the first plastic part 3 is installed from the inside of the battery shell 1, so that the first plastic part 3 is sandwiched between the positive terminal 11 and the positive current collecting disk 22, and the positive electrode column 21 is extended from the through hole 111 of the electrode column to the outside of the battery shell 1, and then the second plastic part 5 is sleeved on the positive electrode column 21. Then, the screw tool is operated to make the deformation part 210 collapse and deform, form a crimping convex edge and press the second plastic part 5 between the crimping convex edge and the positive terminal 11. Finally, the screw tool is disassembled to complete the installation of the positive electrode part 2 on the battery shell 1.

[0052] The battery positive electrode structure of this embodiment adopts a positive electrode member 2 which is integrally formed by a positive electrode column 21 and a positive electrode current collecting disk 22, and enables the deformation portion 210 on the positive electrode column 21 to deform to form a crimping convex edge pressed on the positive terminal 11, thereby facilitating the assembly of the positive electrode member 2 and the battery shell 1, thereby reducing the difficulty of assembly, improving the product yield, and also facilitating the realization of product mass production needs.

[0053] Embodiment 2

[0054] This embodiment relates to a battery, in which the battery positive electrode structure of embodiment 1 is provided. It is worth noting that the battery is preferably a cylindrical battery.

[0055] In terms of specific structure, look back Figure 1As shown, the battery also includes a wound cell and a negative electrode member disposed in a battery shell 1. The positive electrode and the negative electrode at both ends of the wound cell are electrically connected to the positive electrode member 2 and the negative electrode member, respectively. In addition, other structures in the battery not described, such as the specific structure of the wound cell and the specific structure of the negative electrode member, can refer to the structures in the prior art.

[0056] The battery of this embodiment, by adopting the battery positive electrode structure of the first embodiment, can reduce the difficulty of battery assembly, ensure the battery production yield, and also facilitate the quantitative production of batteries, and has a good use effect.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery positive electrode structure, characterized in that: It includes a pole through hole provided on the positive terminal of the battery shell, and a positive pole piece; The positive electrode component is integrally formed by a positive electrode column and a positive current collecting disk, the positive electrode collecting disk is arranged inside the battery shell and is insulated and connected to the battery shell, the positive electrode column extends from the electrode column through hole to the outside of the battery shell, and the positive electrode column is sealed and connected to the positive terminal; a deformation portion is provided on the positive electrode column, the deformation portion is deformed by force and forms a crimping convex edge, and the crimping convex edge is pressed on the positive terminal.

2. The battery positive electrode structure according to claim 1, characterized in that: A sealing ring is provided between the positive pole and the pole through hole. The sealing ring is sleeved on the positive pole and is connected with the pole through hole by clamping.

3. The positive electrode structure of a battery according to claim 2, characterized in that: The upper ring of the sealing ring is provided with a clamping groove in its circumferential direction, and the edge of the positive terminal located at the pole through hole is clamped in the clamping groove.

4. The battery positive electrode structure according to claim 3, characterized in that: The thickness b of the sealing ring satisfies: 0.5mm≤b≤0.6mm.

5. The battery positive electrode structure according to claim 1, characterized in that: A first plastic part is provided between the positive electrode current collecting disk and the positive electrode terminal; and / or, A second plastic part is provided between the crimping protrusion and the positive terminal.

6. The battery positive electrode structure according to claim 1, characterized in that: A first threaded hole and a second threaded hole are coaxially arranged in the positive electrode column. The first threaded hole is arranged close to the positive electrode current collecting plate, and the aperture of the first threaded hole is smaller than the aperture of the second threaded hole.

7. The battery positive electrode structure according to any one of claims 1 to 6, characterized in that: The deformation portion is in a circular ring shape, and a distance a between an upper edge of the deformation portion and an outer end surface of the positive terminal satisfies: 3mm≤a≤5mm.

8. The battery positive electrode structure according to claim 7, characterized in that: A distance c between the upper end surface of the positive electrode current collecting disk and the inner end surface of the positive electrode terminal satisfies: 0.5 mm≤c≤0.6 mm.

9. A battery, characterized in that: The battery is provided with the battery positive electrode structure according to any one of claims 1 to 8.

10. The battery according to claim 9, characterized in that: The battery also includes a wound battery cell and a negative electrode member disposed in the battery shell; The positive electrode and the negative electrode at both ends of the wound battery core are electrically connected to the positive electrode member and the negative electrode member respectively.

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