Battery pin with Y-shaped transition structure and high-magnification battery

Abstract

The utility model discloses a battery pin with a Y-shaped transition structure and a high-magnification battery. The battery pin comprises a pole connecting part, a tab connecting part and a connecting transition part fixedly connected between the pole connecting part and the tab connecting part, the pole connecting part body is in a flat plate shape; the tab connecting part body is in a vertical plate shape, the connecting transition part is Y-shaped, the two ends of the upper part of the connecting transition part are fixedly connected to one end of the tab connecting part respectively, and the tail end of the connecting transition part is fixedly connected to the upper surface of the pole connecting part; according to the utility model, the connection reliability of the pole connecting part and the tab connecting part can be improved, the thickness limitation of the tab connecting part is broken through, the structural strength and the open-current area are improved, and the lithium ion battery is suitable for high-magnification batteries. The utility model is particularly suitable for a full-tab winding type battery cell, and the convenience of battery cell assembly is improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery technology, specifically to a Y-shaped transition structure battery pin and a high-rate battery. Background Technology

[0002] In existing technologies in the field of lithium-ion battery technology, the lead tab connection portion is thickened to improve overcurrent capacity, as shown in patent CN 221328046 U, "Battery Leads and High-Rate Battery". However, the leads and top cover disclosed in this patent are more suitable for multi-tab wound cells or stacked cells with positive and negative tabs located at both ends of the cell. For full-tab wound cells with tabs located at both ends of the cell, the tabs have arc-shaped protrusions at the corners of the cell. During cell assembly, the lack of clearance between the leads causes the tabs to protrude, making it difficult to assemble the cell into the casing or increasing the casing size, thus reducing the volumetric energy density of the battery. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide a battery pin with a Y-shaped transition structure and a high-rate battery. For all-tab wound battery cells, the aim is to improve the overcurrent capacity of the pins without changing the overall structure and manufacturing process of the original battery cell. By designing a Y-shaped connection transition structure for the pins and setting a circular arc clearance position for the tabs, the assembly problem of all-tab wound battery cells can be improved.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a battery pin with a Y-shaped transition structure, including a terminal post connection portion and a tab connection portion; and a connecting transition portion fixed between the terminal post connection portion and the tab connection portion. The main body of the terminal post connection portion is flat. There are two tab connection portions, each with a vertical plate-like body. The connecting transition portion is Y-shaped, including a root portion and two forked portions fixed to the upper end of the root portion. The two forked portions are respectively fixed to the two tab connection portions. The cross-sectional area of ​​the root portion is greater than the sum of the cross-sectional areas of the two tab connection portions. The root portion is fixed to the middle of the terminal post connection portion, serving as a receiving space for the arc-shaped protrusions of the tabs at the ends of the fully tab-wound battery cell formed on the left and right sides of the connecting transition portion.

[0005] As a further optimization, the junction between the root and the pole post connection is provided with an arc-shaped chamfer.

[0006] As a further optimization, the arc-shaped chamfer is a weld bead formed by welding the root and the surface of the pole connection.

[0007] As a further optimization, the thickness of the pole post connection is 1.0mm to 2.5mm, the thickness of the tab connection is 1.0mm to 3.5mm, and the thickness of the connection transition is 2.0mm to 8.0mm.

[0008] As a further optimization, the end of the pole connection portion away from the pole tab connection portion is provided with a through hole for connecting the pole.

[0009] This invention also provides a high-rate battery, including battery pins with a Y-shaped transition structure as described above.

[0010] As a further optimization, the two battery pins of the Y-shaped transition structure are respectively fixed to the two ends of the lower part of the battery top cover on the top of the high-rate battery; the battery top cover is fastened to the top of the outer shell of the high-rate battery; the battery pins of the Y-shaped transition structure are fixed to the tabs at the end of the cells inside the high-rate battery, and the arc-shaped protrusion is accommodated in the gap between the connecting transition part and the inner wall of the outer shell.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] (1) The tab connection part of this utility model can be integrally formed with the pole post connection part or it can be made separately. The connection transition part is set with a tab arc clearance position, which improves the assembly problem of the full tab wound type battery cell.

[0013] (2) The thickness of the tab connection part of this utility model can be different from the thickness of the pole connection part, breaking through the thickness limitation of the tab connection part. The thickness of the tab connection part is increased by 20%-40% to adapt to the overcurrent capacity during high current discharge.

[0014] (3) This utility model does not change the structure of the original battery cell, but improves the overcurrent capability of the pins under the original assembly process.

[0015] In summary, this invention improves structural strength and current-carrying area, making it suitable for high-rate batteries. Simultaneously, the Y-shaped pin structure and the arc-shaped clearance between the tabs overcome the difficulties in assembling fully tab-wound cells into the casing, resulting in a compact battery structure and ensuring high volumetric energy density. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the first Y-shaped transition structure battery pin in this utility model;

[0017] Figure 2 This is a side view of the battery pins of the first Y-shaped transition structure in this utility model;

[0018] Figure 3This is a schematic diagram of the battery pin structure of the second Y-shaped transition structure in this utility model;

[0019] Figure 4 This is a side view of the battery pins of the second Y-shaped transition structure in this utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the battery top cover in this utility model;

[0021] Figure 6 This is a schematic diagram of the internal structure of the battery in this utility model.

[0022] The following are explanations of the reference numerals in the figure: 100-battery pin; 110-terminal connection part; 111-through hole; 120-tab connection part; 130-connection transition part; 200-battery top cover; 210-positive terminal; 220-negative terminal; 300-cell; 310-positive tab; 320-negative tab. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Example 1, please refer to Figure 1 , 2 5, 6.

[0025] This embodiment provides a Y-shaped transition structure for battery pins, used to electrically connect the battery cell 300 to the battery terminals, such as... Figure 1 In this embodiment, the battery pin 100 has a terminal connection portion 110 connected to the battery terminal, and a tab connection portion 120 extending into the battery casing and connected to the tab of the cell 300. The pin body includes the terminal connection portion 110, the tab connection portion 120, and the connection transition portion 130, which can be integrally extruded. In this embodiment, the terminal connection portion 110 is used to connect to the battery terminal, and the tab connection portion 120 is used to connect to the battery tab. Specifically, the terminal connection portion 110 and the battery terminal are connected by laser welding. The current of the cell 300 flows from the battery tab to the tab connection portion 120 of the pin body, then from the tab connection portion 120 to the terminal connection portion 110 of the pin body, and finally back to the battery terminal. The electrode connection 110, electrode connection 120 and connection transition 130 are integrally extruded, which can increase the connection reliability between the electrode connection 110 and the electrode connection 120, while avoiding welding defects left over from the welding process and increasing the flow area.

[0026] In another embodiment, the end of the transition connection portion 130 is laser-welded to the pole post connection portion 110, which also has the same effect. Therefore, under the condition of satisfying the connection transition portion 130 structure of this embodiment, connection can also be achieved by filler wire welding, riveting, vibration friction welding or resistance welding.

[0027] Without altering the overall structure and manufacturing process of the original battery cell 300, preferably, the thickness of the positive electrode post 210 connection portion 110 is 2.0 mm. Preferably, the thickness of the negative electrode post 220 connection portion 110 is 1.2 mm. Preferably, the thickness of the positive electrode tab 310 connection portion 120 is 2.8 mm. Preferably, the thickness of the negative electrode tab connection portion 120 is 1.8 mm.

[0028] As can be seen, through this embodiment, the thickness of the tab connection 120 can be increased by 20%-40% compared to the thickness of the pole connection 110, which greatly improves the current carrying capacity of the tab connection 120.

[0029] Based on the battery pins with the Y-shaped transition structure disclosed in Embodiment 1, this utility model also discloses a battery top cover, specifically as follows: Figure 5 As shown, where, Figure 5 To more clearly demonstrate the assembly relationship between the battery terminals and the terminal connection 110 of the lead body.

[0030] This utility model discloses a battery top cover, comprising: two pins with different polarities, at least one of which is the aforementioned battery pin 100. Specifically, as shown... Figure 5 As shown, the battery cover provided in this embodiment includes a positive terminal pin and a negative terminal pin. The positive terminal pin and the negative terminal pin have the same structure as the battery pin 100 described above, but the materials of the positive terminal pin and the negative terminal pin are different.

[0031] Furthermore, such as Figure 5 As shown, the battery top cover also includes a cover plate body and terminals, with pins located on one side of the battery top cover 200; the terminals correspond one-to-one with the pins, with one end of the terminal connected to the corresponding pin and the other end passing through the battery top cover 200.

[0032] Specifically, the battery cover 200 includes a positive terminal 210 and a negative terminal 220. The positive and negative terminals are located on the same side of the cover body. The positive terminal extends into the battery casing and connects to the positive terminal tab 310 of the cell 300. The negative terminal extends into the battery casing and connects to the negative terminal tab of the cell 300. The positive terminal 210 passes through the positive terminal tab and the top cover body and connects to the positive terminal of an external device. The negative terminal 220 passes through the negative terminal tab and the cover body and connects to the negative terminal of an external device.

[0033] This embodiment provides a high-rate battery, which includes a cell 300 and a battery top cover 200 as described in the above embodiment, wherein the electrode connection portion 120 is welded to the electrode of the cell 300.

[0034] The battery top cover 200 has been described in detail in the above embodiments and will not be repeated here.

[0035] In this embodiment, the battery includes a plurality of battery cells 300. In order to connect the plurality of battery cells 300 in parallel, the tabs of the same electrode of the plurality of battery cells 300 are connected together using battery pins 100. The tabs of each battery cell 300 are welded to the tab connection portion 120.

[0036] Example 2, please refer to Figure 3 , 4 .

[0037] Based on the Y-shaped transition structure of the battery pins disclosed in Embodiment 1, this embodiment differs from Embodiment 1 in that the connection transition portion 130 and the terminal connection portion 110 are joined at different points. The connection transition portion 130 has a weld bead formed by welding on the joint surface of the terminal connection portion 110. The through hole 111 of the terminal connection portion is used to connect the terminal. Therefore, this embodiment has superior structural strength, and the current distribution in the connection transition portion 130 is more uniform.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery pin with a Y-shaped transition structure, comprising a terminal connection portion (110), a tab connection portion (120); and a connection transition portion (130) fixedly connected between the terminal connection portion (110) and the tab connection portion (120), characterized in that: The pole post connector (110) has a flat plate shape; there are two pole tab connectors (120), and their bodies are vertical plates. The connecting transition portion (130) is Y-shaped, including a root and two forked portions fixed to the upper end of the root; the two forked portions are respectively fixed to two electrode connecting portions (120); the cross-sectional area of ​​the root is greater than the sum of the cross-sectional areas of the two electrode connecting portions (120); The root is fixed in the middle of the pole connection part (110) and serves to accommodate the arc-shaped protrusions of the pole tabs at the end of the full-tab wound cell on the left and right sides of the connection transition part (130).

2. The battery pin with the Y-shaped transition structure according to claim 1, characterized in that: The junction between the root and the pole post connection (110) is provided with an arc-shaped chamfer.

3. The battery pin with the Y-shaped transition structure according to claim 2, characterized in that: The arc-shaped chamfer is a weld bead formed by welding the root and the surface of the pole connection (110).

4. The battery pin with the Y-shaped transition structure according to claim 1, characterized in that: The end of the pole post connecting part (110) away from the pole tab connecting part (120) is provided with a through hole (111) for connecting the pole post.

5. A high-rate battery, characterized in that: The battery pins include the Y-shaped transition structure as described in any one of claims 1-4.

6. The high-rate battery according to claim 5, characterized in that: Two battery pins (100) of the Y-shaped transition structure are respectively fixed to the lower ends of the battery top cover (200) on the top of the high-rate battery; the battery top cover (200) covers the top of the outer shell of the high-rate battery; the battery pins of the Y-shaped transition structure are fixed to the tabs at the ends of the cells (300) inside the high-rate battery, and the arc-shaped protrusion is accommodated in the gap between the connecting transition part (130) and the inner wall of the outer shell.

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