A new type of connecting piece for battery

Abstract

The utility model discloses a novel connecting piece for battery belongs to chemical power supply technology and capacitor technical field, and it aims at solving the problem that the existing battery connecting piece cannot disconnect in time when encountering external short circuit and easily causes heat runaway. The connecting piece includes a positive connecting piece, a groove is formed on the positive connecting piece, and a hole (the hole width is greater than the groove width) is arranged in the groove; the positive connecting piece is integrally formed by two tab connecting parts and a pole connecting part (in the shape of a "pin" or a single word type distribution), and is made of aluminum alloy material. The utility model forms the directional fracture weak link through the groove and the hole, can disconnect the circuit quickly when the battery external short circuit, and effectively improves the battery safety.

Description

Technical Field

[0001] This utility model relates to the fields of chemical power source technology and capacitor technology, and in particular to a novel battery connector. Background Technology

[0002] As the global energy structure shifts towards cleaner and lower-carbon energy sources, the safety and reliability of chemical power sources, as core components in energy storage systems, electric vehicles, and portable electronic devices, have become a critical bottleneck for industry development. Among these challenges, thermal runaway caused by external short circuits in batteries, due to its sudden onset and wide-ranging hazards, has long been a significant obstacle to battery technology iteration and application expansion. To standardize battery safety performance, my country's latest national standard for energy storage batteries, GB36276-2023, imposes stricter requirements on short-circuit testing: the short-circuit test resistance has been reduced from ≤5mΩ to ≤1mΩ. This adjustment directly addresses more extreme short-circuit scenarios in practical applications—lower resistance means a larger instantaneous current and more intense energy release during a short circuit, posing unprecedented challenges to battery safety protection mechanisms.

[0003] However, the design of existing battery positive electrode connectors is insufficient to meet the requirements of the new national standard. Traditional positive electrode connectors mostly adopt a homogeneous structure, which can ensure conductivity and structural strength during normal charging and discharging. However, when encountering an external short circuit, due to the lack of weak points for directional fracture, the connector cannot disconnect the cell from the external circuit in a short time. This directly leads to the battery continuously discharging externally under short-circuit conditions, with a large amount of electrical energy instantly converted into heat energy. This causes a sharp rise in the internal temperature of the cell, electrolyte decomposition, and consequently, safety accidents such as smoke from the terminals, bulging of the casing, or even fire.

[0004] Current industry attempts to address this issue have significant limitations: simply reducing the thickness of the connector to lower the fracture threshold can lead to deformation and insufficient current carrying capacity during normal operation due to insufficient mechanical strength; while increasing brittleness through material adjustments can affect conductivity, making it difficult to balance safety and electrochemical performance. Therefore, we propose a novel connector for batteries. Utility Model Content

[0005] The main objective of this invention is to propose a novel battery connector that can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a novel battery connector, comprising:

[0007] A positive electrode connector, wherein a groove is formed on the positive electrode connector;

[0008] The positive electrode connecting piece includes two tab connecting parts, a pole column connecting part is arranged between the two tab connecting parts, and the two tab connecting parts and the pole column connecting part are integrally formed.

[0009] As a further description of the above technical solution, the two tab connecting parts and the pole column connecting part are distributed in a "pin" shape.

[0010] As a further description of the above technical solution, the number of the grooves is one, and it is opened on the pole column connecting part.

[0011] As a further description of the above technical solution, the two tab connecting parts and the pole column connecting part are arranged in a line.

[0012] As a further description of the above technical solution, the number of the grooves is two, and they are respectively opened at the joints of the two tab connecting parts and the pole column connecting part.

[0013] As a further description of the above technical solution, holes are opened in the grooves, and when the battery is short-circuited externally, the grooves are easier to break.

[0014] The width of the holes ≥ the width of the grooves.

[0015] As a further description of the above technical solution, the positive electrode connecting piece is made of aluminum alloy.

[0016] Compared with the prior art, the present utility model has the following beneficial effects:

[0017] By setting grooves on the positive electrode connecting piece as the weak links for directional fracture, and cooperating with the holes in the grooves (the width of the holes ≥ the width of the grooves), the fracture threshold during short circuit is significantly reduced. When the battery is short-circuited externally, the grooves can be quickly broken due to stress concentration and structural weakening, effectively disconnecting the connection between the battery cell and the external circuit, and avoiding thermal runaway (such as pole column smoking, shell bulging, fire, etc.) caused by continuous discharge, thus improving the short-circuit safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of a connecting piece for a new type of battery of the present utility model;

[0019] Figure 2 It is a schematic diagram of the overall structure of the second embodiment of a connecting piece for a new type of battery of the present utility model;

[0020] Figure 3 It is a schematic diagram of the overall structure of the third embodiment of a connecting piece for a new type of battery of the present utility model;

[0021] Figure 4 It is a schematic diagram of the overall structure of the fourth embodiment of a connecting piece for a new type of battery of the present utility model;

[0022] Figure 5 This is a schematic diagram of the overall structure of Embodiment 5 of the present invention, which describes a novel battery connector.

[0023] In the diagram: 1. Positive electrode connector; 2. Groove; 3. Hole; 11. Tab connector; 12. Terminal connector. Detailed Implementation

[0024] To make the technical means, creative features, and objectives of this utility model easier to understand, the following describes this utility model in conjunction with specific embodiments.

[0025] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] Please see Figure 1-5 This utility model provides a technical solution: a novel battery connector, including a positive electrode connector 1, a groove 2 on the positive electrode connector 1, the positive electrode connector 1 including two tabs 11, and a pole post 12 between the two tabs 11, the two tabs 11 and the pole post 12 are integrally formed by aluminum alloy.

[0028] To further explain, the strength of the positive electrode connecting piece 1 in the groove 2 is weakened at this point. In the event of an external short circuit, the groove 2 is easily disconnected, thereby effectively disconnecting the cell from the external circuit and preventing the battery from continuously discharging externally.

[0029] To further explain, the tab connection 11 is connected to the tab in the battery, and the terminal connection 12 is connected to the terminal in the battery.

[0030] Example 1:

[0031] As Figure 1 shown, the two tab connecting parts 11 and the pole connecting part 12 are distributed in a "pin" shape. The number of grooves 2 is two, which are respectively opened at the joints of the two tab connecting parts 11 and the pole connecting part 12. The groove 2 adopts a straight groove.

[0032] Example 2:

[0033] As Figure 2 shown, the two tab connecting parts 11 and the pole connecting part 12 are distributed in a "pin" shape. The number of grooves 2 is two, and a plurality of holes 3 are opened in each groove 2. The width of the hole 3 ≥ the width of the groove 2. When the battery is short-circuited externally, the groove 2 is easier to break.

[0034] Example 3:

[0035] As Figure 3 shown, the two tab connecting parts 11 and the pole connecting part 12 are distributed in a "pin" shape. The number of grooves 2 is one, which is opened on the pole connecting part 12. The groove 2 adopts a straight groove.

[0036] Example 4:

[0037] As Figure 4 shown, the two tab connecting parts 11 and the pole connecting part 12 are distributed in a "pin" shape. The number of grooves 2 is one, which is opened on the pole connecting part 12. A plurality of holes 3 are opened in each groove 2. The width of the hole 3 ≥ the width of the groove 2. When the battery is short-circuited externally, the groove 2 is easier to break.

[0038] Example 5:

[0039] As Figure 5 shown, the two tab connecting parts 11 and the pole connecting part 12 are arranged in a line. The number of grooves 2 is two, which are respectively opened at the joints of the two tab connecting parts 11 and the pole connecting part 12. A plurality of holes 3 are opened in each groove 2. The width of the hole 3 ≥ the width of the groove 2. When the battery is short-circuited externally, the groove 2 is easier to break.

[0040] Further explanation, in the above embodiments, the depth of the groove 2 is preferably 1 / 3 - 2 / 3 of the thickness of the positive connecting piece 1, the width is preferably 0.1 - 5 mm, and the overall shape of the groove can be linear or curved.

[0041] Further explanation, in the above embodiments, the hole 3 can be circular, elliptical or polygonal, and the number is 1 or more (which can be evenly or unevenly distributed).

[0042] Further explanation, in the embodiment where the positive connection pieces 1 are distributed in a "pin" shape, it is applicable to the battery structure with the tab and the terminal arranged vertically. In the embodiment where the positive connection pieces 1 are distributed in a straight line, it is applicable to the battery structure with the tab and the terminal arranged in a straight line.

[0043] Further explanation, the preferred connection methods of the tab connection part 11 with the tab and the terminal connection part 12 with the terminal are laser welding.

[0044] It should be noted that the present utility model is a connection piece for a new type of battery. The battery uses this connection piece to connect with the battery tab through the tab connection part 11 (laser welding), and connect with the battery terminal through the terminal connection part 12 (laser welding), forming a conductive path between the inside and outside circuits of the battery to ensure the stable transmission of current during normal charge and discharge processes. When an external short circuit occurs in the battery, the circuit resistance drops sharply, resulting in an instantaneous sharp increase in current. The connection piece generates a large amount of heat due to the Joule effect. At the same time, the electromagnetic force generated by the current causes the connection piece to bear a large mechanical stress. Since the groove 2 is a preset weak structural part (the cross-sectional area is smaller than other parts of the connection piece), and the hole 3 (width ≥ groove width) in the groove 2 further reduces the structural strength here, the heat and stress preferentially accumulate at the groove, causing the groove 2 to break quickly, thereby cutting off the connection between the battery cell and the external circuit, preventing the battery from continuously discharging externally, and avoiding safety accidents such as a sudden rise in the temperature of the battery cell, decomposition of the electrolyte, and thermal runaway caused by heat accumulation. Compared with the existing connection pieces for new type of batteries, the present utility model forms a directional fracture weak link through the groove and the hole, and can quickly disconnect the circuit when an external short circuit occurs in the battery, effectively improving the safety of the battery.

[0045] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A novel tab for a battery, characterized by, Comprising: A positive electrode connecting piece (1), on which a groove (2) is provided; The positive electrode connecting piece (1) includes two tab connecting parts (11), a pole column connecting part (12) is arranged between the two tab connecting parts (11), and the two tab connecting parts (11) and the pole column connecting part (12) are integrally formed.

2. The novel tab for a battery according to claim 1, characterized by, The two tab connecting parts (11) and the pole column connecting part (12) are distributed in a "pin" shape.

3. A novel tab for a battery as claimed in claim 2, wherein The number of the grooves (2) is one, and it is opened on the pole column connecting part (12).

4. The novel tab for a battery of claim 1, wherein The two tab connecting parts (11) and the pole column connecting part (12) are arranged in a line.

5. The novel tab for a battery according to claim 2 or 4, characterized by The number of the grooves (2) is two, and they are respectively opened at the joints of the two tab connecting parts (11) and the pole column connecting part (12).

6. The novel tab for a battery according to claim 3 or 5, wherein Holes (3) are opened in the grooves (2), and the holes (3) make the grooves (2) easier to break when the battery is short-circuited externally.

7. A novel tab for a battery as claimed in claim 6, wherein The width of the holes (3) ≥ the width of the grooves (2).

8. The novel tab for a battery of claim 1, wherein The positive electrode connecting piece (1) is made of aluminum alloy.

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