Pole, battery cover plate assembly and battery

Abstract

The utility model belongs to the technical field of lithium ion batteries, and particularly relates to a pole, a battery cover plate assembly and a battery, a pole conductive part is arranged at the bottom of the pole, the pole conductive part and the pole are integrally punched and formed, a pole bending part is arranged at the joint of the pole conductive part and the pole, and a pole conductive part avoiding groove is formed in the middle of the bottom of the pole. And the pole conductive part and the pole group connecting part are welded and bent and then are positioned in the pole conductive part avoiding groove. And the pole conductive part replaces the function of a normal battery cell switching piece, so that the manufacturing process of the battery cell is simpler. And the pole is provided with a pole bending part, so that the pole conductive part is easier to bend according to the direction shown in the graph.

Description

Technical Field

[0001] This utility model belongs to the field of lithium-ion battery technology, specifically relating to an electrode post, a battery cover assembly, and a battery. Background Technology

[0002] Currently, lithium-ion batteries are widely used in automobiles and energy storage systems. The cost and safety of battery cell structural components are mainly concentrated in the battery cover, which accounts for a large part of the cost of battery cell structural components. Due to its complex structure, the battery cover has high requirements for process stability, which affects the safety of the battery cell.

[0003] The applicant recently filed an application for a battery cover and battery, application number: CN2023222921164. The battery cover includes a plain aluminum plate. On both sides of the plain aluminum plate, a positive electrode pressure plate and a positive electrode coating structure are connected sequentially from top to bottom, as are a negative electrode pressure plate and a negative electrode coating structure. The plain aluminum plate is connected to a lower gasket via a negative electrode connecting plate and a positive electrode connecting plate. The positive and negative electrode pressure plates, positive and negative electrode coatings, and positive and negative electrode connecting plates are riveted together to form an integral battery cover structure. This riveting method eliminates the need for drilling during riveting, ensuring a tight seal. Another example is a Chinese patent that discloses a battery cover and battery, application number: CN2021220876610. The battery cover includes a connecting piece, a terminal post, a first coating portion, and a second coating portion. The connecting piece has a terminal hole; the connecting piece on the outer periphery of the top of the terminal hole is rolled inward to form a rolled edge portion, and the rolled edge portion has a hole-shaped or groove-shaped anti-rotation portion; a second adhesive portion covers the rolled edge portion and the terminal, and the second adhesive portion fills the anti-rotation portion and the first through hole. In this battery cover structure, the second adhesive portion covers the rolled edge portion and fills the anti-rotation portion, restricting the rotation of the second adhesive portion relative to the rolled edge portion; at the same time, the second adhesive portion fills the first through hole, restricting the rotation of the terminal relative to the second adhesive portion, ultimately preventing the terminal relative to the connecting piece from rotating.

[0004] Both of the above structures share common drawbacks: in the first structure, the aluminum plate is connected to the lower pad through the negative electrode connecting plate and the positive electrode connecting plate; in the second structure, the lower end of the electrode post is directly welded to the electrode assembly. In both of these structures, the bottom of the electrode post occupies a portion of the space inside the cell, resulting in wasted space in the height direction of the cell, which leads to a smaller cell and a reduction in the energy density of the cell. Utility Model Content

[0005] The purpose of this utility model is to provide an electrode post, a battery cover assembly, and a battery to solve the problems existing in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] The utility model provides a kind of pole, the bottom of pole is equipped with pole electrically conductive part, with pole integral punch forming, it is equipped with pole bending part at pole electrically conductive part and pole connecting place, the middle of the bottom of pole is equipped with pole electrically conductive part avoiding slot, pole electrically conductive part is located in pole electrically conductive part avoiding slot after welding bending with pole group connecting part.The function of normal battery cell adapter piece is replaced by pole electrically conductive part, so that the manufacturing process of battery cell is simpler.Pole is equipped with pole bending part, so that pole electrically conductive part is more easily bent according to the direction of illustration.

[0008] Preferably, the annular circumferential recess of the pole forms a riveting portion.

[0009] Preferably, the two sides of the pole electrically conductive portion are respectively provided with the pole bending portion.

[0010] Preferably, the pole material is aluminum or copper-aluminum composite material, and the thickness of the pole is 2.5-5 mm.

[0011] The utility model also provides a kind of battery cover plate assembly, including light aluminum plate, be equipped with the light aluminum plate through-hole for installing pole on the light aluminum plate, further include the pole, the pole is riveted at the light aluminum plate through-hole.

[0012] Preferably, the light aluminum plate is provided with a light aluminum plate sealing recess, the light aluminum plate through-hole is provided with a sealing ring, and the sealing ring cooperates with the light aluminum plate sealing recess.

[0013] Preferably, the bottom of the light aluminum plate is provided with a battery cover plate insulating plate, the battery cover plate insulating plate has a battery cover plate insulating plate through-hole, the battery cover plate insulating plate through-hole corresponds to the position of the light aluminum plate through-hole and has the same aperture.

[0014] Preferably, a gap between the pole and the light aluminum plate is connected with a pole encapsulating portion, the pole encapsulating portion is provided with a pole encapsulating portion protrusion, and the light aluminum plate is assembled with the light aluminum plate cooperating recess on the light aluminum plate.

[0015] Preferably, the side of the pole is provided with a pole barb portion, and the pole encapsulating portion is correspondingly provided with a pole encapsulating portion recess.

[0016] The utility model also provides a kind of battery, including pole group main body and battery shell, pole group main body is installed in the battery shell, the upper portion of the battery shell is installed with the battery cover plate assembly, and the pole group connecting portion of the pole group main body is connected with the pole electrically conductive portion.

[0017] The utility model discloses an advantageous effect is: the utility model discloses through changing the assembly mode of pole post, reduced the thickness of pole post, provided more assembly space for the inside of electric core, thereby promoted the energy density of electric core. Moreover, the battery cover plate structure of its embodiment is simple, thereby will have higher battery cover plate good product rate. Meanwhile, be equipped with pole post bending part and pole post conducting part on the pole post, after with pole group welding is completed, the pole post is bent, replaced the traditional connecting sheet, improved the production efficiency of electric core. The recess of light aluminum plate sealing place is increased, and the effective area of sealing ring sealing is improved. Be equipped with pole post barb part on the pole post, reduced the risk of pole post rubber part falling off. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Provide the front view of battery cover plate for the utility model;

[0019] Figure 2 For Figure 1 The section view along A-A;

[0020] Figure 3 The utility model discloses the explosion drawing of battery cover plate;

[0021] Figure 4 The section view of battery cover plate pole post for the utility model;

[0022] Figure 5 The schematic diagram of battery cover plate for the utility model;

[0023] Figure 6 The schematic diagram of battery cover plate and pole group before welding for the utility model;

[0024] Figure 7 The schematic diagram of battery cover plate and pole group after welding for the utility model;

[0025] Figure 8 The assembly drawing of battery for the utility model;

[0026] The drawings are explained as follows:

[0027] 1, battery cover plate;11, light aluminum plate;111, light aluminum plate through -hole;112, light aluminum plate explosion -proof valve hole;113, light aluminum plate sealing recess;12, pole post;121, pole post external end face;122, riveting portion;123, pole post conducting part;124, pole post barb part;125, pole post bending part;126, pole post conducting part avoidance groove;13, sealing ring;131, sealing ring through -hole;14, pole post rubber portion;141, pole post rubber portion through -hole;142, pole post rubber portion recess;143, pole post rubber portion protruding;15, battery cover plate insulating plate;151, battery cover plate insulating plate through -hole;16, explosion -proof valve;17, explosion -proof valve film paste;2, pole group;21, pole group connecting portion;22, pole group main body;3, battery shell. DETAILED DESCRIPTION

[0028] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0030] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection", "fixed connection", "fixed connection" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] The specific embodiments of the present application will be described in detail below with reference to the drawings and preferred embodiments.

[0032] As Figure 4 As shown in the figure, the present application provides a pole, the bottom of the pole is provided with a pole conductive part 123, which is integrally stamped with the pole, a pole bending part 125 is arranged at the connection between the pole conductive part and the pole, a pole conductive part avoiding groove 126 is arranged in the middle of the bottom of the pole, and the pole conductive part and the pole group connecting part are welded and bent to be located in the pole conductive part avoiding groove. The pole conductive part avoiding groove reduces the thickness of the pole, provides more assembly space inside the battery cell, can assemble larger battery cells, and thus improves the energy density of the battery cell. The pole conductive part replaces the function of the normal battery cell adapter, making the manufacturing process of the battery cell simpler. The pole is provided with a pole bending part, so that the pole conductive part is more easily bent in the direction shown in the figure.

[0033] AsFigure 4 As shown, the circumferential inner recess of the pole post forms a riveting part 122 for riveting with the battery cover plate, specifically, the riveting part 122 is a groove provided on the circumference of the pole post, and the groove can accommodate the sealing ring 13 and the battery cover plate insulating plate 15. The outer end surface 121 of the pole post is welded with the module bus bar.

[0034] The pole post 12 is made of aluminum material or copper-aluminum composite material, and the material thickness is 2.5mm-5mm (referring to the thickness of the conductive part 123 of the pole post), which is made by stamping process and has good conductivity.

[0035] As shown, the utility model discloses a battery cover plate assembly, and the battery cover plate 1 includes an aluminum plate 11, the aluminum plate is provided with an aluminum plate through hole 111 for installing the pole post, and the pole post is riveted at the aluminum plate through hole. Figures 1-3 The aluminum plate through hole is provided with a sealing ring through hole corresponding to the position of the aluminum plate through hole. The outer diameter of the sealing ring through hole matches the inner diameter of the aluminum plate through hole, the cross section of the sealing ring is L-shaped, and the sealing ring can be clamped at the aluminum plate through hole. The sealing effect of the runway type sealing ring is worse than that of the circular sealing ring, and the runway type sealing ring is easy to be twisted and deformed during the assembly of the battery cover plate 1, so that the sealing performance is not good. The utility model is provided with an aluminum plate sealing recess 113 on the aluminum plate 11, as shown, the sealing effective area of the sealing ring 13 is increased, and the sealing performance of the runway type sealing ring is ensured. Figure 2

[0036] The bottom of the aluminum plate is provided with a battery cover plate insulating plate 15, the battery cover plate insulating plate is provided with a battery cover plate insulating plate through hole 151, the battery cover plate insulating plate through hole corresponds to the position of the aluminum plate through hole and has the same hole diameter. By changing the structure of the pole post, the space size occupied by the pole post is reduced, the internal design of the battery cell is more diversified, and the energy density of the battery cell is improved. The gap between the pole post and the aluminum plate is connected with a pole post glue part 14, which has the functions of conducting electricity or insulating, and the pole post glue part 14 is provided with a pole post glue part through hole 141. The inner diameter of the pole post glue part through hole 141 matches the outer diameter of the sealing ring, can be sleeved on the outside of the sealing ring, and is in contact with the pole post and the aluminum plate. As shown, Figure 2 Figure 3 Figure 5 The pole post glue part 14 is provided with a pole post glue part protrusion 143, which is assembled with the aluminum plate cooperation groove 114 on the aluminum plate 11, plays a positioning function, ensures the assembly size, and makes the battery cell assembly process simpler.

[0037] As shown, Figure 2 Figure 4 ​​​​As shown, the pole post 12 is provided with a pole post barb 124, and the pole post rubber coating part 14 is correspondingly provided with a pole post rubber coating part groove 142, the pole post 12 has a downward force on the pole post rubber coating part 14, so that the pole post rubber coating part 14 is not easy to fall off due to the vibration of the battery cell or the impact of external force, and the strength is correspondingly increased, thereby ensuring the safety performance of the insulation.

[0038] The light aluminum plate 11 is the main part of the battery cover plate 1, and the sealing ring 13, the pole post rubber coating part 14 and the battery cover plate insulating plate 15 are assembled together with the main part of the battery cover plate 1 through the riveting part 122 of the pole post 12. The sealing ring 13 is compressed by the pole post 12, that is, the sealing ring 13 is compressed and deformed to achieve the sealing effect of the pole post 12 of the battery cover plate 1.

[0039] The pole post rubber coating part 14 and the battery cover plate insulating plate 15 are respectively formed by injection molding; the sealing ring 13 is made of fluorine rubber and is formed by vulcanization, and has good high temperature resistance and sealing performance. The light aluminum plate 11 is made of aluminum material and is formed by stamping.

[0040] As Figure 8 shown, the utility model discloses a battery, including pole group 2, pole group 2 including pole group connecting part 21 and pole group main part 22, pole group main part installs in battery shell 3, the upper portion of battery shell is equipped with battery cover plate subassembly, and the pole group connecting part of pole group main part is connected with pole post conducting part.

[0041] When the pole group connecting part 21 on the pole group 2 is welded with the pole post conducting part 123, the pole post conducting part 123 is bent according to the bending direction shown in the drawing. Figure 6 Figure 7 It is the assembly schematic view of the bent pole post conducting part 123, and the pole group connecting part 21 is moved to the inside of the pole post 12, and the space of the pole post can be effectively utilized.

[0042] For ordinary skilled person in the art, without departing from the principle of the utility model, a plurality of improvements and refinements can be made, and these improvements and refinements should be regarded as the protection scope of the utility model.​

Claims

1. A pole, characterized by: The bottom of the pole column is provided with a pole column conductive part which is integrally stamped and formed with the pole column, a pole column bending part is arranged at the connecting position of the pole column conductive part and the pole column, a pole column conductive part avoiding groove is arranged in the middle of the bottom of the pole column, and the pole column conductive part and the pole column connecting part are welded and bent to be located in the pole column conductive part avoiding groove.

2. The pole according to claim 1, characterized in that: The annular circumferential part of the pole column is inwardly recessed to form a riveting part.

3. The pole as claimed in claim 1, characterized in that: The two sides of the pole column conductive part are respectively provided with the pole column bending part.

4. The pole according to claim 1, wherein: The material of the pole column is aluminum or copper-aluminum composite material, and the thickness of the pole column is 2.5mm-5mm.

5. A battery cover plate assembly comprising an aluminum plate, wherein an aluminum plate through hole for mounting a post is provided on the aluminum plate, characterized in that: The pole column riveted at the light aluminum plate through hole is also included.

6. The battery cover plate assembly of claim 5, wherein: The light aluminum plate is provided with a light aluminum plate sealing recess, the light aluminum plate through hole is provided with a sealing ring, and the sealing ring cooperates with the light aluminum plate sealing recess.

7. The battery cover plate assembly of claim 5, wherein: The bottom of the light aluminum plate is provided with a battery cover plate insulating plate, the battery cover plate insulating plate is provided with a battery cover plate insulating plate through hole, the battery cover plate insulating plate through hole corresponds to the position of the light aluminum plate through hole and has the same aperture.

8. The battery cover plate assembly of claim 5, wherein: The gap between the pole column and the light aluminum plate is connected with a pole column rubber coating part, the pole column rubber coating part is provided with a pole column rubber coating part protrusion which cooperates with the light aluminum plate cooperation recess on the light aluminum plate.

9. The battery cover plate assembly of claim 8, wherein: The side of the pole column is provided with a pole column barb part, and the pole column rubber coating part is correspondingly provided with a pole column rubber coating part recess.

10. A battery comprising a cell body and a battery case, the cell body being housed within the battery case, characterized by: The upper part of the battery shell is provided with the battery cover plate assembly of any one of claims 6-9, and the pole column connecting part of the pole group main body is connected with the pole column conductive part.

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