Connection structure of pole and electric connection sheet, battery and electric equipment

Abstract

The utility model relates to a connecting structure of a post terminal and an electric connecting sheet, a battery and electric equipment, which comprises a post terminal provided with a groove; the electric connecting sheet is provided with a through hole; the connecting bolt penetrates through the through hole, is inserted into the groove and is used for connecting the pole and the electric connecting sheet; wherein the connecting bolt comprises a bolt body and a connecting part, the connecting part is arranged outside the bolt body, the connecting part is connected with the groove, and the connecting part is suitable for being melted at a set temperature so as to release the connecting relation between the connecting part and the groove; the utility model provides a connection structure of a pole and an electric connection sheet, a battery pack and electric equipment, which not only can improve the connection efficiency and the connection yield of the pole and the electric connection sheet, but also has the functions of preventing external short circuit and overlarge current, and improves the safety of a battery.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, in particular to a connection structure between a pole and an electric connecting piece, a battery pack and electrical equipment. Background Art

[0002] Traditional energy depletion and environmental problems are becoming increasingly serious. Lithium batteries are widely used in new energy vehicles, aerospace, communications and other fields due to their high energy density, long life and green environmental protection. Power batteries generally include battery cells, metal shells and top covers. There are positive and negative ears on the top of the battery cell, and positive and negative poles, explosion-proof valves and injection holes on the top cover. During assembly, the positive and negative ears are welded to the positive and negative poles, and then the battery cell is placed in the shell, and the battery top cover and shell are welded and sealed. After injection, formation and constant capacity, a complete battery cell is obtained.

[0003] After the battery is unloaded, performance and safety tests are often required. At this time, welding the busbar (electrical connector) is a necessary procedure. Traditional welding of the electrical connector requires a welding machine to weld the electrical connector to the pole. This behavior is time-consuming and labor-intensive, and there is a possibility of poor welding, which further reduces the yield of the battery.

[0004] Moreover, conventional poles are solid structures in square, oval or circular shapes. If the solid structure can be made into a hollow structure or a hollowed-out part, it will certainly help to reduce the mass of the battery, thereby improving the energy density of the single cell. Based on the convenience and safety design of the electrical connecting piece, the present application provides a highly safe connection method between the pole and the electrical connecting piece. Utility Model Content

[0005] To this end, the technical problem to be solved by the utility model is to overcome the problem in the prior art that welding of the pole and the electrical connecting piece is time-consuming and labor-intensive, and is prone to poor welding, and to provide a connection structure, a battery pack and an electrical equipment between the pole and the electrical connecting piece, which can not only improve the connection efficiency and connection yield rate between the pole and the electrical connecting piece, but also have the function of preventing external short circuit and excessive current, thereby improving the safety of the battery.

[0006] In order to solve the above technical problems, the utility model provides a connection structure between a pole and an electrical connection piece, comprising:

[0007] A pole having a groove;

[0008] An electrical connection sheet having a through hole;

[0009] A connecting bolt is inserted into the groove through the through hole to connect the pole and the electrical connecting piece;

[0010] Wherein: the connecting bolt comprises a bolt body and a connecting portion, the connecting portion is arranged outside the bolt body, the connecting portion is connected to the groove, and the connecting portion is suitable for melting at a set temperature to release the connection relationship between it and the groove.

[0011] In one embodiment of the utility model, the bolt body includes: a column and a bolt head, the column is inserted into the groove through the through hole of the electrical connecting piece, the connecting part is arranged on the surface of the column, the bolt head is abutted against the electrical connecting piece, and the bolt head presses the electrical connecting piece against the pole.

[0012] In an embodiment of the present invention, the connecting portion is a threaded structure, and the connecting portion and the groove are threadedly connected.

[0013] In one embodiment of the present invention, the set temperature is: 100°C-150°C.

[0014] In an embodiment of the present invention, the connecting portion is made of tin alloy.

[0015] In one embodiment of the present invention, the depth of the groove is greater than the length of the connecting bolt extending into the groove, and after the connecting bolt is inserted into the groove, an accommodating space is reserved at the bottom of the groove.

[0016] In one embodiment of the present invention, it further comprises a first sealing member and a second sealing member which are overlapped and arranged on the upper and lower sides of the electrical connecting sheet and sleeved on the connecting bolt.

[0017] In one embodiment of the present invention, both the first sealing member and the second sealing member are thermistor rings.

[0018] In order to solve the above technical problems, the utility model also provides a battery, comprising:

[0019] A plurality of battery cells, each of which has a terminal;

[0020] An electrical connecting piece, used to connect the poles of two adjacent battery cells;

[0021] A connecting bolt, fixing the electrical connecting piece on the battery cell;

[0022] Wherein: the pole, the electrical connection piece and the connection bolt constitute the connection structure between the pole and the electrical connection piece.

[0023] In order to solve the above technical problems, the utility model also provides an electrical device, including the above battery.

[0024] The above technical solution of the utility model has the following advantages compared with the prior art:

[0025] The utility model provides a connection structure between a pole and an electric connection piece, wherein a connection bolt is first passed through a through hole on the electric connection piece and then inserted into a groove in the pole, so as to realize a fixed connection between the electric connection piece and the pole. Compared with a welding connection method, the connection efficiency and connection yield rate between the pole and the electric connection piece can be improved;

[0026] In addition, the connecting portion of the connecting bolt is capable of melting at a set temperature to release the connection between the connecting bolt and the pole. When the current is too large, the temperature rises and the connecting portion melts, resulting in a larger gap between the connecting bolt and the pole, causing the connecting bolt to deviate, thereby reducing the contact area between the connecting bolt and the pole, and increasing the contact internal resistance, which can reduce the current in the circuit, thereby reducing the risk of short circuit.

[0027] On the other hand, the utility model processes the pole and arranges a groove in the pole, which is beneficial to reducing the weight of the battery, thereby improving the energy density of the single cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein:

[0029] Figure 1 It is an overall schematic diagram of the connection structure between the pole and the electrical connection piece of the utility model;

[0030] Figure 2 It is a schematic diagram of the internal structure of the pole of the utility model;

[0031] Figure 3 It is a structural schematic diagram of the electrical connecting piece of the utility model;

[0032] Figure 4 It is a structural schematic diagram of the connecting bolt of the utility model;

[0033] Figure 5 It is a structural schematic diagram of the connection bolt of the utility model after hot melting and matching with the pole.

[0034] Explanation of the reference numerals in the drawings in the specification: 1. Pole; 11. Groove; 2. Electrical connecting piece; 21. Through hole; 3. Connecting plug; 31. Plug body; 311. Column; 312. Plug head; 32. Connecting part; 33. Melted connecting part; 4. First sealing member; 5. Second sealing member. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0036] In practice, the inventors of the utility model found that in the process of welding the electrical connecting piece to the pole, there is a possibility of poor welding. The welding process is not only time-consuming and labor-intensive, but also reduces the yield of the battery. Moreover, after the electrical connecting piece and the pole are welded, the contact area between the two is fixed. When the internal current of the battery is too large or short-circuited, the welded electrical connecting piece and the pole do not have any processing capabilities and do not have the ability to resist short circuits.

[0037] The utility model provides a connection structure between a pole and an electric connection piece, wherein a connection bolt is first passed through a through hole on the electric connection piece and then inserted into a groove in the pole, so as to realize a fixed connection between the electric connection piece and the pole. Compared with a welding connection method, the connection efficiency and connection yield rate between the pole and the electric connection piece can be improved;

[0038] In addition, the connecting portion of the connecting bolt is capable of melting at a set temperature to release the connection between the connecting bolt and the pole. When the current is too large, the temperature rises and the connecting portion melts, resulting in a larger gap between the connecting bolt and the pole, causing the connecting bolt to shift, thereby reducing the contact area between the connecting bolt and the pole and increasing the contact internal resistance, which can reduce the current in the circuit and thus reduce the risk of short circuit, thereby solving the above-mentioned problem.

[0039] The cylindrical battery of the present invention is further explained below in conjunction with specific embodiments.

[0040] Reference Figure 1 As shown, the utility model provides a connection structure between a pole and an electrical connection piece, comprising: a pole 1, an electrical connection piece 2 and a connection bolt 3, wherein: Figure 2 As shown, a groove 11 is provided on the surface of the pole 1 facing the electrical connection sheet 2; Figure 3 As shown, a through hole 21 is provided on the electrical connection sheet 2; Figure 4 As shown, the connecting bolt 3 includes a bolt body 31 and a connecting portion 32, and the connecting portion 32 is arranged outside the bolt body 31; during the assembly process, the electric connecting piece 2 is placed on the pole 1, so that the through hole 21 is aligned with the groove 11, and then the connecting bolt 3 is first passed through the through hole 21 and then inserted into the groove 11. The connecting portion 32 of the connecting bolt 3 is connected with the groove 11, so that the electric connecting piece 2 can be pressed and fixed on the pole 1 to achieve the connection between the electric connecting piece 2 and the pole 1. With this connection method, there is no need to use welding equipment for processing, and quick connection can be achieved, reducing process steps and shortening connection time. In addition, with the mechanical fixed connection method, there is no problem of poor connection due to process problems, ensuring the stability of the connection between the electric connecting piece 2 and the pole 1 and providing a qualified rate of the finished product.

[0041] Furthermore, considering the safety issue, the connection portion 32 is configured to melt at a set temperature to release the connection relationship between it and the groove 11. Figure 5 As shown, when there is excessive current or short circuit, causing the temperature to rise rapidly and be higher than the set temperature, the connecting portion 32 can melt, and the connecting portion 32 is no longer connected to the groove 11, so that a larger gap is generated between the connecting bolt 3 and the pole 1, causing the connecting bolt 3 to be offset, thereby reducing the contact area between the connecting bolt 3 and the pole 1, and increasing the contact internal resistance, which can reduce the current in the circuit, thereby reducing the risk of short circuit, so that the connection structure of the pole 1 and the electrical connecting plate 2 of the present application has the ability to resist short circuits.

[0042] It should be noted that the set temperature needs to be higher than the temperature when the battery is working normally, that is, to ensure that the connection relationship is stable when the battery is working normally, and on the other hand, it needs to be lower than the temperature when the battery has an overcurrent or short circuit. Therefore, the set temperature is: 100°C ~ 150°C, and the set temperature is determined according to the temperature when different models of batteries have an overcurrent or short circuit.

[0043] Specifically, in order to achieve the above-mentioned set temperature, in this embodiment, the material of the connecting part 32 is set to be tin alloy. The tin alloy has a low melting point and can meet the above-mentioned set temperature. In addition, controlling the proportion of the material in the tin alloy can accurately calculate the melting point of the tin alloy, thereby ensuring that the connecting part 32 can meet the melting requirements of the set temperature.

[0044] Reference Figure 1 As shown, in this embodiment, the depth of the groove 11 is greater than the length of the connecting bolt 3 extending into the groove 11. After the connecting bolt 3 is inserted into the groove 11, an accommodating space is reserved at the bottom of the groove 11. Figure 5 As shown, after the connection portion 32 is melted, the molten connection portion 33 can be completely stored at the bottom of the groove 11, and sufficient space is reserved in the groove 11. On the one hand, it can ensure that the connection portion 32 is completely separated from the bolt body 31, and the connection portion 32 no longer restricts the movement of the bolt body 31, so that a larger gap is generated between the bolt body 31 and the pole 1. On the other hand, the melted connection portion 32 is stored in the groove 11. When the connecting bolt 3 is replaced later, the melted connection portion 32 can be extracted by hot melting to achieve reuse.

[0045] It should be noted that the conventional pole 1 is a square, oval or circular solid structure. In this embodiment, a groove 11 is provided in the pole 1, which is also helpful to reduce the weight of the battery, thereby improving the energy density of the single cell.

[0046] In the actual assembly process, the connecting bolt 3 is used to fix the electrical connection piece 2 and the pole 1 together. On the one hand, it is necessary to ensure that the connecting bolt 3 can press the electrical connection piece 2 on the pole 1 to prevent the electrical connection piece 2 and the pole 1 from being separated. On the other hand, it is necessary to ensure the stability of the connection between the connecting bolt 3 and the groove 11 to prevent the connecting bolt 3 from falling off from the groove 11. In order to meet the above two requirements:

[0047] Reference Figure 4 As shown, the bolt body 31 includes: a column 311 and a bolt head 312, the column 311 passes through the through hole 21 of the electrical connection piece 2 and is inserted into the groove 11, the connecting portion 32 is arranged on the surface of the column 311, the bolt head 312 is protrudingly arranged on one side of the column 311, the cross-sectional area of ​​the bolt head 312 is larger than the cross-sectional area of ​​the column 311, the bolt head 312 cannot be inserted into the groove 11, the bolt head 312 can abut against the electrical connection piece 2 outside the groove 11, the bolt head 312 presses the electrical connection piece 2 against the pole 1, and when the connecting portion 32 is fixedly connected to the groove 11, the bolt head 312 presses the electrical connection piece 2 to limit the position, and the bolt head 312 fixes the position of the electrical connection piece 2, which can prevent the electrical connection piece 2 from moving and prevent the electrical connection piece 2 from separating from the pole 1.

[0048] Preferably, in order to achieve quick connection between the connecting part 32 and the groove 11, in the present embodiment, the connecting part 32 is set to be a threaded structure, and a threaded groove matching the threaded structure is provided on the side wall of the groove 11, thereby achieving a threaded connection between the connecting part 32 and the groove 11. The threaded connection is not only stable, but also convenient for quick connection and disassembly. In other embodiments, a rotating clamping structure may also be provided to achieve quick connection between the connecting part 32 and the groove 11.

[0049] Furthermore, in the process of long-term use, considering that the threaded connection may become loose, in order to avoid this situation, refer to Figure 1As shown, in this embodiment, it also includes a first seal 4 and a second seal 5 which are overlapped and arranged on the upper and lower sides of the electrical connection sheet 2 and sleeved on the connecting bolt 3. The first seal 4 and the second seal 5 are provided with bolt holes for the connecting bolt 3 to pass through. During the assembly process, the second seal 5 is first placed on the pole 1, and then the electrical connection sheet 2 is placed on the second seal 5, and finally the first seal 4 is placed on the electrical connection sheet 2, so that the groove 11 of the pole 1, the bolt holes in the first seal 4 and the second seal 5, and the through hole 21 in the electrical connection sheet 2 correspond to each other, and then the connecting bolt 3 is inserted into the groove 11 by sequentially passing through the bolt hole of the first seal 4, the through hole 21 in the electrical connection sheet 2, and the bolt hole of the second seal 5. The first seal 4 and the second seal 5 are provided to increase the rotation resistance of the connecting bolt 3, prevent the connecting bolt 3 from loosening, and ensure the tightness of the connection.

[0050] Preferably, the first seal 4 and the second seal 5 are both thermistor rings, which can increase resistance when the temperature is too high. When the current is too large, the resistance of the thermistor ring will rise rapidly with the increase in temperature, and the connecting part 32 on the connecting bolt 3 will melt, causing the contact internal resistance of the screw and the pole 1 to increase. The increase in the contact internal resistance + the resistance of the thermistor can further increase the total resistance in the circuit, reduce the current in the circuit, and thus reduce the risk of short circuit.

[0051] The utility model also provides a battery, comprising:

[0052] A plurality of battery cells, each of which has a pole 1;

[0053] An electrical connection sheet 2, used to connect the poles 1 of two adjacent battery cells;

[0054] A connecting bolt 3 is used to fix the electrical connecting piece 2 on the battery cell;

[0055] Among them: the pole 1, the electrical connecting piece 2 and the connecting bolt 3 constitute the connection structure between the pole 1 and the electrical connecting piece 2. The main design point of the utility model lies in the improvement of the connection structure between the pole 1 and the electrical connecting piece 2. For other structures of the battery, they will not be described one by one.

[0056] The present invention also provides an electrical device, the battery used in which is one of the above-mentioned embodiments. The main design point of the present invention is to improve the connection structure between the pole 1 and the electrical connecting piece 2. Other structures of the electrical device, such as the electrical connection part and the mechanical structure part of the electrical device, will not be described one by one.

[0057] Electrical equipment may be automobiles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, etc. Automobiles may be fuel-powered automobiles, gas-powered automobiles, or new energy automobiles. New energy automobiles may be pure electric vehicles, hybrid electric vehicles, or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecrafts, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the utility model do not impose any special restrictions on the above-mentioned electrical equipment.

[0058] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A connection structure between a pole and an electrical connection piece, characterized in that: include: A pole (1) having a groove (11); An electrical connection sheet (2) having a through hole (21); A connecting bolt (3) is inserted into the groove (11) through the through hole (21) to connect the pole (1) and the electrical connecting piece (2); Wherein: the connecting bolt (3) comprises a bolt body (31) and a connecting portion (32), wherein the connecting portion (32) is arranged outside the bolt body (31), the connecting portion (32) is connected to the groove (11), and the connecting portion (32) is suitable for melting at a set temperature to release the connection relationship between it and the groove (11).

2. The connection structure between the pole and the electrical connection sheet according to claim 1, characterized in that: The bolt body (31) comprises: a column (311) and a bolt head (312); the column (311) passes through the through hole (21) of the electrical connection piece (2) and is inserted into the groove (11); the connecting portion (32) is arranged on the surface of the column (311); the bolt head (312) abuts against the electrical connection piece (2); and the bolt head (312) presses the electrical connection piece (2) against the pole (1).

3. The connection structure between the pole and the electrical connection sheet according to claim 1, characterized in that: The connecting portion (32) is a threaded structure, and the connecting portion (32) and the groove (11) are threadedly connected.

4. The connection structure between the pole and the electrical connection sheet according to claim 1, characterized in that: The set temperature is: 100°C-150°C.

5. The connection structure between the pole and the electrical connection sheet according to claim 4, characterized in that: The connecting portion (32) is made of tin alloy.

6. The connection structure between the pole and the electrical connection sheet according to claim 1, characterized in that: The depth of the groove (11) is greater than the length of the connecting bolt (3) extending into the groove; after the connecting bolt (3) is inserted into the groove (11), an accommodating space is reserved at the bottom of the groove (11).

7. The connection structure between the pole and the electrical connection sheet according to claim 1, characterized in that: It also comprises a first sealing member (4) and a second sealing member (5) which are overlapped and arranged on the upper and lower sides of the electrical connection sheet (2) and sleeved on the connection bolt (3).

8. The connection structure between the pole and the electrical connection sheet according to claim 7, characterized in that: The first sealing member (4) and the second sealing member (5) are both thermistor rings.

9. A battery, characterized in that: include: A plurality of battery cells, each of which has a pole (1); An electrical connecting piece (2) used for connecting the poles (1) of two adjacent battery cells; A connecting bolt (3) for fixing the electrical connecting piece (2) on the battery cell; Wherein: the pole (1), the electrical connection piece (2) and the connection bolt (3) constitute a connection structure of the pole and the electrical connection piece according to any one of claims 1 to 8.

10. An electrical equipment, characterized in that: A battery comprising the battery of claim 9.

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