Battery pole and battery

Abstract

The utility model relates to a battery post which comprises a tab connecting part, an external connecting part and a combining part for connecting the tab connecting part and the external connecting part, the tab connecting part is configured to be connected with a tab of a battery, and the external connecting part is configured to be electrically connected with external equipment. And a clearance part is also arranged between the tab connecting part and the external connecting part. According to the utility model, the combination area between the copper pole and the aluminum pole of the negative pole is reduced, and when the battery is short-circuited, the negative pole is fused at the combination part firstly due to the small combination area, so that the battery is disconnected, and the safety performance of the battery is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery terminal and a battery. Background Technology

[0002] As the primary power source for new energy vehicles, power batteries have become one of the key components of electric vehicles. With users' increasing demands for the range of new energy vehicles, improving the energy density of lithium-ion batteries is an important direction and method. Currently, thinner separators and current collectors, as well as compact and reasonable structural designs, are commonly used to achieve high energy density.

[0003] However, current battery structures typically use electrical adapters to connect the battery tabs and terminals, and incorporate fuses on these adapters to improve battery safety. However, the use of adapters hinders compact and miniaturized battery design. Therefore, eliminating the adapter structure has become a new approach to improving energy density in battery design. However, without the adapter, when an external short circuit occurs, a large current instantaneously flows through the battery, but the circuit cannot be broken through the fuse of the adapter, potentially leading to a short circuit, overheating, or even explosion. Utility Model Content

[0004] This utility model provides a battery terminal, including a tab connection part, an external connection part, and a connecting part connecting the tab connection part and the external connection part. The tab connection part is configured to be connected to the tab of the battery, and the external connection part is configured to be electrically connected to an external device. A clearance part is also provided between the tab connection part and the external connection part.

[0005] Furthermore, the joint is formed by welding.

[0006] Furthermore, the clearance portion is provided on both sides of the joint.

[0007] Furthermore, there are two joints, and the clearance portion is disposed between the two joints.

[0008] Furthermore, the clearance section is constructed in an arc shape.

[0009] Furthermore, the clearance section is rectangular in shape.

[0010] Furthermore, the clearance section is also provided with insulating components.

[0011] Furthermore, the external connecting part is also provided with a notch.

[0012] Furthermore, the external connecting part is made of aluminum, and the electrode connecting part is made of copper.

[0013] On the other hand, this utility model provides a battery, which includes any of the battery terminals described above, and also includes a bare battery cell, wherein the bare battery cell is provided with a tab, and the tab is directly connected to the battery terminal.

[0014] This invention features a negative electrode post with a clearance portion between the external connection part and the tab connection part. This reduces the contact area between the copper and aluminum electrodes of the negative electrode post. When a short circuit occurs in the battery, due to the small contact area, the negative electrode post will melt and break at the contact point first, thus breaking the battery circuit and improving battery safety. Simultaneously, the internal electrode post is directly connected to the tab, eliminating the need for an adapter plate structure, reducing battery production costs, and increasing the overall energy density of the battery. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the internal structure of the battery of this utility model;

[0016] Figure 2 This is a cross-sectional schematic diagram of the top cover assembly of the battery of this utility model;

[0017] Figure 3 This is a cross-sectional view of the first embodiment of the battery terminal of this utility model;

[0018] Figure 4 This is a cross-sectional view of the second embodiment of the battery terminal of this utility model;

[0019] Figure 5 This is an exploded view of the third embodiment of the battery terminals of this utility model;

[0020] Figure 6 This is an exploded view of the fourth embodiment of the battery terminals of this utility model;

[0021] Figure 7 This is an exploded view of the fifth embodiment of the battery terminals of this utility model. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0023] The direction indicated by this utility model is referenced to the battery terminals in the accompanying drawings and the placement of the terminals. For example... Figure 1-2As shown, the battery of this utility model includes a bare cell 10, a positive electrode tab 101, a negative electrode tab 102, a positive electrode post 80, a negative electrode post 30, and a top cover 20. The bare cell 10 is made by winding or stacking positive electrode sheets, negative electrode sheets, and a separator. The positive electrode tab 101 is shaped, gathered, and ultrasonically pre-welded before being directly fixed to the positive electrode post 80 by laser welding. The negative electrode tab 102 is shaped, gathered, and ultrasonically pre-welded before being directly connected to the negative electrode post 30. The positive electrode post 80 and the negative electrode post 30 are mounted on the top cover 20 and are electrically insulated from the top cover body through sealing and insulating components. In this embodiment, the positive electrode tab 101 and the positive electrode post, and the negative electrode tab 102 and the negative electrode post 30 are directly connected, eliminating the need for an adapter plate. This design can increase the battery's overcurrent capacity, reduce internal resistance, and simultaneously meet the higher charging rate requirements. By saving space for the thickness of the adapter plate, the internal volume utilization of the battery can be improved, thereby further increasing the battery's energy density. Furthermore, the laser welding process between the connector plate and the top cover terminal post is reduced, simplifying the product manufacturing process and lowering material costs. Example 1

[0024] like Figure 3The negative electrode post 30 shown includes a tab connection portion 302, an external connection portion 301, and a joint portion 303 connecting the tab connection portion 302 and the external connection portion 301. A clearance portion A is also provided between the tab connection portion 302 and the external connection portion 301. The tab connection portion 302 is configured to connect to the negative electrode tab 102 of the battery. The tab connection portion 302 is a roughly cylindrical copper electrode post made of copper material through a stamping process. The external connection portion 301 is configured to connect electrically to an external device. The external connection portion 301 is a roughly cylindrical aluminum electrode post made of aluminum material through a stamping process. The external connection portion 301 also has a notch portion 304. The external connection portion 301 and the tab connection portion 302 are connected by welding to form the joint portion 303. Friction welding is preferred, but other welding methods or other connection methods can also be used to form the joint portion. In this embodiment, the connecting portion 303 is disposed at both ends of the negative electrode post 30, and the clearance portion A is disposed between the two connecting portions, forming an arc shape. Combined with the stamping process of the external connecting portion, the clearance portion A preferentially has its lower middle portion of the external connecting portion 301 concave, while the upper end of the middle portion of the electrode tab connecting portion 301 is planar. Thus, when the two are connected, an arc-shaped clearance portion A is formed in the middle position. The forming process of the arc-shaped clearance portion is simple. Compared to the prior art where the external connecting portion and the electrode tab connecting portion are a single, complete connecting portion from left to right without a clearance portion A, this invention adds a clearance portion between the external connecting portion and the electrode tab connecting portion. This reduces the area of ​​the connecting portion between the electrode tab connecting portion and the external connecting portion, thereby reducing the current-carrying area of ​​the connecting portion and decreasing the current threshold that can be carried. When the external connection portion 301 of the negative terminal receives excessive current due to an external short circuit, the entire battery rapidly generates heat. Due to the presence of the recess, the current that the connection can withstand is reduced, making the negative terminal connection a weak point for overcurrent. When the heat reaches a certain level, the negative terminal connection melts and breaks. Due to its own weight and the pulling force of the bare cell tab, the tab connection portion 302 eventually falls onto the bare cell 10, thus breaking the battery circuit. Simultaneously, because a notch 304 is provided on the external connection portion 301, the cross-sectional area of ​​the negative terminal 30 at the notch 304 is smaller than other parts. Therefore, even if the connection of the negative terminal does not break due to an abnormal reason, the notch further ensures a small overcurrent area, allowing for further melting and breaking of the battery circuit. Example 2

[0025] The difference between this embodiment and Embodiment 1 is that the connecting part 403 is located in the middle of the negative electrode post 40 in the left-right direction, and the clearance part B is located at the left and right ends of the negative electrode post. Example 3

[0026] The difference between this embodiment and Embodiment 1 is that, in this embodiment, the negative electrode post 50 is further provided with an insulating sheet 503 in the clearance between the electrode tab connection part 502 and the external connection part 501. The insulating sheet 503 can limit the welding of the electrode tab connection part 502 and the external connection part 501, and at the same time, it can protect the electrode tab connection part 502 after the electrode tab connection part 502 and the external connection part 501 melt down, preventing the electrode tab connection part 502 and the external connection part 501 from reconnecting. Example 4

[0027] The difference between this embodiment and Embodiment 1 is that the negative electrode post 60 in this embodiment is manufactured using composite plate molding technology. The negative electrode post 60 comprises an aluminum electrode post 601, a copper electrode post 602, and an insulating sheet 603. During molding, the copper electrode post 602 is placed at the bottom, then the insulating sheet 603 is placed in the middle of the copper electrode post 602, without insulating sheets at both ends, and then the aluminum electrode post 601 is placed on top. The clearance portion is located in the middle part in the left-right direction, at the location where the insulating sheet 603 is located, and the joint portion is located on both sides of the clearance portion. Example 5

[0028] The difference between this embodiment and Embodiment 1 is that the negative electrode post 60 in this embodiment includes an electrode tab connection 702, an external connection 701, and an insulating sheet 703. The electrode tab connection 702 is cylindrical, and the external connection 701 is rectangular. A rectangular groove is provided in the middle of the lower end of the external connection 701, and the insulating sheet 703 is disposed in the rectangular groove. The external connection 701 and the electrode tab connection 702 are connected by composite molding technology, so that the insulating sheet 703 is disposed in the rectangular groove to form a clearance portion. The left and right ends of the negative electrode post are combined with the electrode tab connection 702 and the external connection 701 by composite technology.

[0029] The above embodiments mainly describe the structure of the negative electrode post and the battery of this utility model. The negative electrode post of this utility model has a clearance portion between the external connecting part and the tab connecting part, reducing the bonding area between the copper and aluminum electrodes. When a short circuit occurs in the battery, due to the small bonding area, the negative electrode post will first melt at the bonding part, thus breaking the battery circuit and improving battery safety. At the same time, the electrode post inside the battery is directly connected to the tab, eliminating the adapter structure, reducing battery production costs, and increasing the overall energy density of the battery.

[0030] The above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery terminal, comprising a tab connection portion, an external connection portion, and a connecting portion connecting the tab connection portion and the external connection portion, wherein the tab connection portion is configured to connect to a battery tab, and the external connection portion is configured to be electrically connected to an external device, characterized in that, An air gap is also provided between the electrode connecting part and the external connecting part.

2. The battery terminal as described in claim 1, characterized in that, The joint is formed by welding.

3. The battery terminal as described in claim 1, characterized in that, The clearance portion is located on both sides of the joint.

4. The battery terminal as described in claim 1, characterized in that, The joint is provided in two parts, and the clearance part is provided between the two joints.

5. The battery terminal as described in claim 1, characterized in that, The clearance section is arc-shaped.

6. The battery terminal as described in claim 1, characterized in that, The clearance section is rectangular in shape.

7. The battery terminal as described in claim 1, characterized in that, The clearance section is also equipped with insulating components.

8. The battery terminal as described in claim 1, characterized in that, The external connecting part is also provided with a notch.

9. The battery terminal as described in claim 1, characterized in that, The external connector is made of aluminum, and the tab connector is made of copper.

10. A battery, characterized in that, It includes a battery terminal as described in any one of claims 1-9, and also includes a bare battery cell, wherein the bare battery cell is provided with a tab, and the tab is directly connected to the battery terminal.

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