Connecting structure of negative electrode bus tray and battery shell

Abstract

The utility model discloses a connection structure of a negative pole confluence plate and a battery shell, which comprises a shell and a negative pole confluence plate positioned in the shell, and further comprises an inner insulation spacer, an outer insulation spacer and a self-plugging rivet, the negative pole confluence plate and the shell are riveted and fixed by the self-plugging rivet, the inner insulation spacer is arranged between the negative pole confluence plate and the shell, and the outer insulation spacer is arranged between the negative pole confluence plate and the shell. And the outer insulating spacer is arranged between the shell and the self-plugging rivet. The beneficial effects of the utility model are that the negative electrode confluence plate and the housing are riveted through the self-plugging rivet, so that the negative electrode confluence plate is fixed, the self-plugging rivet can replace a pole, the connection firmness is strong, and the installation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of cylindrical batteries, in particular to a connection structure between a negative electrode busbar and a battery shell. Background Art

[0002] With the continued in-depth development of the lithium battery industry, the huge demand in the energy storage field, and the requirements for low-cost and large-scale products, the development of large cylindrical batteries in China is constantly increasing due to their technical advantages such as energy density, charge and discharge rate, internal resistance, and the potential for mass production costs. However, the electrical connection between the busbar and the pole is still a key factor restricting mass production.

[0003] At present, the electrical connection methods between the internal poles and busbars of cylindrical batteries mainly adopt resistance welding and ultrasonic torque welding. However, in resistance welding, since it is necessary to use instantaneous large current to melt the metal corresponding to the busbar and the pole, its heat radiation can easily cause the diaphragm in the center of the busbar to shrink, especially when welding the negative busbar and the negative pole, the melting point is higher and the heat radiation problem is more serious. The electrical connection strength of ultrasonic torque welding is low and easy to fall off, especially when responding to vibration testing, the risk of failure is high. In addition, whether it is resistance welding or ultrasonic torque welding, the welding slag generated during the welding process cannot be removed from the inside of the battery, which can easily cause discharge, short circuit and other faults, thereby affecting the quality of the battery. In summary, the problem of electrical connection between the internal poles and busbars of cylindrical batteries, especially the problem of electrical connection between the negative busbar and the poles, has become a technical problem that needs to be solved urgently in the industry. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the existing technology and provide a connection structure between the negative busbar and the battery shell. The negative busbar and the shell are riveted together by blind rivets, which not only achieves the fixation of the negative busbar, but also realizes the replacement of the pole with the blind rivet, with strong connection and convenient installation.

[0005] The purpose of the utility model is achieved through the following technical measures: a connection structure between a negative busbar and a battery shell, comprising a shell and a negative busbar located inside the shell, and also comprising an inner insulating gasket, an outer insulating gasket and a blind rivet, wherein the blind rivet rivets the negative busbar and the shell, the inner insulating gasket is arranged between the negative busbar and the shell, and the outer insulating gasket is arranged between the shell and the blind rivet.

[0006] In some embodiments, the blind rivet is made of copper.

[0007] In some embodiments, the blind rivet includes a rivet body and a rivet core penetrating the rivet body, and the rivet body includes a rivet seat and a rivet column connected to the rivet seat.

[0008] In some embodiments, a rivet hole is opened on the negative electrode busbar. After the negative electrode busbar is riveted to the shell, the inner surface of the rivet hole contacts the outer surface of the rivet column.

[0009] In some embodiments, a mounting hole is formed on the housing, and an inner diameter of the mounting hole is larger than an outer diameter of the rivet stud.

[0010] Compared with the prior art, the present invention has the following advantages: it not only secures the negative collector plate to the housing through blind rivets, but also replaces the poles with blind rivets, eliminating the need for welding connections, resulting in a strong connection and easy installation. Furthermore, the negative collector plate, poles, and housing can be secured in a single operation, improving production efficiency and saving equipment costs. Furthermore, the use of copper blind rivets, with the inner surface of the rivet hole of the negative collector plate in contact with the outer surface of the rivet post, results in a large flow area and high electrical conductivity.

[0011] The present invention will be described in detail below with reference to the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the assembly structure of the utility model.

[0013] Figure 2 This is a structural diagram of the utility model after the riveting action is completed and the fixation is completed.

[0014] Among them, 1. Shell, 2. Negative busbar, 3. External insulating gasket, 4. Internal insulating gasket, 5. Rivet seat, 6. Rivet column, 7. Rivet core. DETAILED DESCRIPTION

[0015] like Figures 1 to 2As shown, a connection structure between a negative busbar and a battery case includes a case 1 and a negative busbar 2 located inside the case 1, and further includes an inner insulating gasket 4, an outer insulating gasket 3, and a blind rivet. The blind rivet rivets the negative busbar 2 to the case 1, the inner insulating gasket 4 is arranged between the negative busbar 2 and the case 1, and the outer insulating gasket 3 is arranged between the case 1 and the blind rivet. Specifically, during assembly, the negative end of the battery case 1 faces downward, the inner insulating gasket 4 and the negative busbar 2 are placed into the case 1 in sequence, the outer insulating gasket 3 is mounted on the blind rivet, and the blind rivet is passed through the case 1, the inner insulating gasket 4, and the negative busbar 2 in sequence. A riveting tool is then used to apply tension to the blind rivet to perform riveting, causing the blind rivet to deform, thereby achieving fixation of the negative busbar 2, the inner insulating gasket 4, the case 1, and the outer insulating gasket 3. The present invention not only secures the negative busbar 2 to the housing 1 through blind rivets, but also replaces the poles with blind rivets, eliminating the need for welding. This provides a strong connection and facilitates installation. Furthermore, the present invention secures the negative busbar 2, poles, and housing 1 in a single operation, improving production efficiency and saving equipment costs.

[0016] The blind rivet is made of copper and has good guiding performance, which can improve the conductive efficiency.

[0017] The blind rivet includes a rivet body and a rivet core 7 passing through the rivet body. The rivet body includes a rivet seat 5 and a rivet column 6 connected to the rivet seat 5. The rivet column 6 passes through the outer insulating gasket 3, the shell 1, the inner insulating gasket 4 and the negative busbar 2 in sequence.

[0018] A rivet hole is provided on the negative busbar 2. After the negative busbar 2 is riveted to the shell 1, the inner surface of the rivet hole contacts the outer surface of the rivet column 6, increasing the flow area between the negative busbar 2 and the blind rivet, further improving the conductive efficiency.

[0019] A mounting hole is provided on the shell 1 , and the inner diameter of the mounting hole is larger than the outer diameter of the rivet column 6 . When the negative busbar 2 is riveted to the shell 1 , a gap is left between the rivet column 6 and the inner wall of the mounting hole. The outer wall of the rivet column 6 does not directly contact the inner wall of the mounting hole, and the rivet column 6 is insulated from the shell 1 .

[0020] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0021] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0022] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments made by ordinary technicians in this field are all within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0024] Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and the specification are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A connection structure between a negative busbar and a battery housing, comprising a housing and a negative busbar located within the housing, characterized in that: It also includes an inner insulating gasket, an outer insulating gasket and a blind rivet, wherein the blind rivet rivets the negative busbar to the shell, the inner insulating gasket is arranged between the negative busbar and the shell, and the outer insulating gasket is arranged between the shell and the blind rivet.

2. The connection structure between the negative busbar and the battery housing according to claim 1, characterized in that: The blind rivets are made of copper.

3. The connection structure between the negative busbar and the battery case according to claim 1 or 2, characterized in that: The blind rivet comprises a rivet body and a rivet core penetrating the rivet body, and the rivet body comprises a rivet seat and a rivet column connected to the rivet seat.

4. The connection structure between the negative busbar and the battery housing according to claim 3, characterized in that: A rivet hole is provided on the negative electrode busbar. After the negative electrode busbar is riveted to the shell, the inner surface of the rivet hole contacts the outer surface of the rivet post.

5. The connection structure between the negative busbar and the battery housing according to claim 3, characterized in that: The shell is provided with a mounting hole, and the inner diameter of the mounting hole is larger than the outer diameter of the rivet column.

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