Large cylindrical high-magnification battery with sodium-ion steel shell

Abstract

The utility model discloses a large cylindrical high-magnification battery with a sodium-ion steel shell, which comprises a battery shell and a battery cell arranged in the battery shell, and an anode diversion end face and a cathode diversion end face are respectively arranged on two sides of the battery cell. The positive current guide end face and the negative current guide end face are respectively provided with a positive current collecting plate and a negative current collecting plate which correspond to each other, the battery shell is a steel shell, and the top and the bottom of the battery shell are respectively provided with a first opening and a second opening; a cap is arranged at the first opening, the cap is connected with the battery shell in an insulating manner, and the cap is connected with the positive collector plate; a negative plate is arranged at the second opening, is connected with the battery shell in an insulating manner, and is connected with the negative collector plate; and the cover cap and the negative plate are made of aluminum materials. According to the utility model, the top of the battery shell and the cap are sealed by adopting a conventional mechanical sealing mode, and the sealing is completed by extruding the sealing ring. And the positive collector plate is connected with the cap through laser welding and is led out. The bottom of the battery shell is made of steel shell aluminum, the middle is separated by an insulating layer, and a negative plate is connected with a negative collector plate by laser penetration welding. According to the utility model, multiple laser welding is utilized, the sealing performance and the welding firmness are good, the welding area is large, the distance is short, the over-current capability is strong, and the requirement of a high-magnification battery is met.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a sodium-electric steel shell large cylindrical high-rate battery. Background Art

[0002] With the development of the industry, the application scenarios of lithium (sodium) ion batteries are becoming more and more extensive. With the development of the new energy industry, lithium (sodium) ions have penetrated into various fields. The requirements for batteries are comprehensive indicators such as capacity, life, safety, environmental adaptability, model, and rate. Cylindrical batteries are widely used in various fields such as energy storage, power supply, and electric vehicles due to their low production cost, high production efficiency, and good safety.

[0003] Due to the different sizes and capacities of cylindrical batteries, the market generally uses single-pole, bipolar, multi-pole, and non-pole structures. The positive electrode is generally welded at the top, and the negative electrode is generally welded at the bottom. For cylindrical batteries, copper needle resistance welding is used to connect the core and steel shell welding, which has become a conventional method due to its simple process. However, this solution only has one overcurrent point, and the overcurrent capacity is low, which cannot meet the requirements of high current charging and discharging. Therefore, how to design a battery that can improve the battery rate performance while ensuring the sealing stability is an urgent problem to be solved. Utility Model Content

[0004] The utility model aims to provide a sodium electric steel shell large cylindrical high rate battery that solves the above problems.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A sodium-electric steel-shell large cylindrical high-rate battery comprises a battery shell and a battery cell arranged inside the battery shell, a positive electrode guide end face and a negative electrode guide end face are respectively arranged on both sides of the battery cell, the positive electrode guide end face and the negative electrode guide end face are respectively provided with corresponding positive electrode collector plates and negative electrode collector plates, the battery shell is a steel shell and the top and bottom of the battery shell are respectively provided with a first opening and a second opening; a cap is arranged at the first opening, the cap is insulated and connected to the battery shell, and the cap is connected to the positive electrode collector plate; a negative electrode plate is arranged at the second opening, the negative electrode plate is insulated and connected to the battery shell, and the negative electrode plate is connected to the negative electrode collector plate; the cap and the negative electrode plate are both made of aluminum.

[0007] Preferably, the cap and the positive electrode current collector are welded by laser penetration welding; the negative electrode plate and the negative electrode current collector are welded by laser penetration welding.

[0008] Preferably, a protrusion is arranged at the center of the cap, the edge of the protrusion is welded to the positive electrode current collecting disc by laser penetration welding, and the outer edge arranged outside the edge is welded to the positive electrode current collecting disc by laser penetration welding.

[0009] Preferably, the first opening is larger than the second opening.

[0010] Preferably, a sealing ring is provided on the edge of the cap, and the cap is sealed and connected to the battery housing.

[0011] Preferably, an insulating layer is provided between the battery housing and the negative electrode plate.

[0012] Preferably, an explosion-proof valve is provided on the cap.

[0013] The beneficial effects of the utility model are as follows: the top of the battery shell and the cap are sealed by conventional mechanical sealing, and the sealing is completed by squeezing the sealing ring. The positive electrode collector is connected to the cap and led out by two laser weldings. The bottom of the battery shell is made of steel shell converted to aluminum, separated by an insulating layer in the middle, and the negative plate is connected to the negative electrode collector by laser penetration welding. The utility model uses multiple laser welding, has good sealing and welding firmness, large welding area, short distance, strong current capacity, and meets the requirements of high-rate batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model;

[0015] Figure 2 It is a structural schematic diagram of the utility model;

[0016] Figure 3 It is a front view structural schematic diagram of the utility model;

[0017] Figure 4 It is a rear view structural schematic diagram of the utility model;

[0018] Among them, there are a battery shell 1, a first opening 11, a second opening 12, a cap 2, a protrusion 21, an edge 211, an outer edge 212, a negative electrode plate 3, an insulating layer 4, an explosion-proof valve 5, and a sealing ring 6. DETAILED DESCRIPTION

[0019] The technical solution of the present application is further described in detail below in conjunction with specific implementation methods.

[0020] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "top", "bottom", etc. are based on the orientations or positional relationships shown in the accompanying 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 a limitation on the present invention.

[0021] like Figures 1 to 4 As shown, the utility model provides a sodium electric steel shell large cylindrical high-rate battery, including a battery shell 1 and a battery cell (not shown) arranged inside the battery shell 1, a positive electrode guide end face and a negative electrode guide end face are respectively arranged on both sides of the battery cell, and the positive electrode guide end face and the negative electrode guide end face are respectively provided with corresponding positive electrode collector plates (not shown) and negative electrode collector plates (not shown). The battery cell, positive electrode collector plate and negative electrode collector plate of the utility model are all common structures in the field, and the functions that can be realized shall prevail.

[0022] The battery housing 1 is a steel shell made of steel, and the top and bottom of the battery housing 1 are respectively provided with a first opening 11 and a second opening 12. A cap 2 is provided at the first opening 11, and the cap 2 is insulated and connected to the battery housing 1, and the cap 2 is welded to the positive electrode collector by laser penetration. A negative electrode plate 3 is provided at the second opening 12, and the negative electrode plate 3 is insulated and connected to the battery housing 1, and the negative electrode plate 3 is welded to the negative electrode collector by laser penetration. Both the cap 2 and the negative electrode plate 3 are made of aluminum.

[0023] Furthermore, a protrusion 21 is provided at the center of the cap 2, and the edge 211 of the protrusion 21 is welded to the positive current collector disk for the first time by laser penetration. An outer edge 212 is provided outside the edge 211 of the protrusion 21, and the outer edge 212 is welded to the positive current collector disk for the second time by laser penetration to lead out the positive electrode. The connection between the cap 2 and the positive current collector disk and the connection between the negative plate 3 and the negative current collector disk are both aluminum-to-aluminum welding, which has good sealing and welding firmness. Through multiple laser welding, the welding area is large, the current flow path is increased, thereby improving the current capacity of the battery and meeting the requirements of high-rate batteries.

[0024] The first opening 11 is larger than the second opening 12. An insulating layer 4 is provided between the battery housing 1 and the negative electrode plate 3. A sealing ring 6 is provided at the edge of the cap 2, and the cap 2 is sealed and connected to the battery housing 1. The battery housing 1 and the cap 2 of the utility model adopt a conventional mechanical sealing method, that is, the sealing is completed by squeezing the sealing ring 6.

[0025] Furthermore, an explosion-proof valve 5 is provided on the cap 2 to ensure the safe and stable operation of the battery.

[0026] The top of the battery housing 1 of the utility model and the cap 2 are sealed by conventional mechanical means, and the sealing is completed by squeezing the sealing ring. The positive electrode collector is connected to the cap 2 by laser welding and led out. The bottom of the battery housing 1 is made of steel shell to aluminum, separated by an insulating layer in the middle, and the negative plate 3 is connected to the negative electrode collector by laser penetration welding. The utility model uses multiple laser welding, has good sealing and welding firmness, large welding area, short distance, strong current capacity, and meets the requirements of high-rate batteries.

[0027] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0028] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A sodium electric steel shell large cylindrical high-rate battery, comprising a battery shell and a battery cell arranged inside the battery shell, wherein a positive electrode current guiding end face and a negative electrode current guiding end face are respectively arranged on both sides of the battery cell, and the positive electrode current guiding end face and the negative electrode current guiding end face are respectively provided with corresponding positive electrode current collecting plates and negative electrode current collecting plates, characterized in that: The battery case is a steel shell and has a first opening and a second opening on the top and bottom respectively; a cap is provided at the first opening, the cap is insulated from the battery case, and the cap is connected to the positive electrode collector; a negative electrode plate is provided at the second opening, the negative electrode plate is insulated from the battery case, and the negative electrode plate is connected to the negative electrode collector; the cap and the negative electrode plate are both made of aluminum.

2. The sodium electric steel shell large cylindrical high rate battery according to claim 1 is characterized in that: The cap and the positive electrode current collector are welded by laser penetration welding; the negative electrode plate and the negative electrode current collector are welded by laser penetration welding.

3. The sodium electric steel shell large cylindrical high rate battery according to claim 2 is characterized in that: A protrusion is arranged at the center of the cap, the edge of the protrusion is welded to the positive electrode current collecting disk by laser penetration welding, and the outer edge arranged outside the edge is welded to the positive electrode current collecting disk by laser penetration welding.

4. The sodium electric steel shell large cylindrical high rate battery according to claim 1 is characterized in that: The first opening is larger than the second opening.

5. The sodium electric steel shell large cylindrical high rate battery according to claim 4 is characterized in that: A sealing ring is arranged on the edge of the cap, and the cap is sealed and connected to the battery housing.

6. The sodium electric steel shell large cylindrical high rate battery according to claim 5 is characterized in that: An insulating layer is provided between the battery housing and the negative electrode plate.

7. The sodium electric steel shell large cylindrical high rate battery according to claim 5, characterized in that: The cover cap is provided with an explosion-proof valve.

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