Electrode terminal, battery cover plate assembly, battery and electric equipment

Abstract

The utility model provides an electrode terminal, a battery cover plate assembly, a battery and electric equipment. The electrode terminal comprises a pole column, a first electrode and a second electrode, the cap cover and the pole column are different metal pieces, and at least one part of the cap cover and one end of the pole column in the axial direction are mutually connected into a whole. The electrode terminal comprises the pole and the cap, and the pole and the cap are directly connected into a whole, so that the use amount of welding flux is reduced, and the cost is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and specifically relates to an electrode terminal, a battery cover assembly, a battery and an electrical device. Background Art

[0002] The electrode terminals in the prior art usually use copper pillars, nickel caps and ceramic rings as raw materials. The copper pillars are connected to the nickel caps by solder. Not only does the amount of solder used lead to high production costs, but there is also a gap between the copper pillars and the nickel caps, which causes the nickel caps to easily detach, leading to poor air tightness of the electrode terminals and low reliability of the connection structure. Utility Model Content

[0003] One purpose of the utility model is to provide a new technical solution for electrode terminals, which can at least solve the technical problem of high production cost of electrode terminals in the prior art.

[0004] Another object of the present utility model is to provide a new technical solution for a battery cover assembly, wherein the battery cover assembly includes the above-mentioned electrode terminal.

[0005] Another object of the utility model is to provide a new technical solution for a battery, wherein the battery includes the above-mentioned battery cover assembly.

[0006] Another object of the utility model is to provide a new technical solution for an electrical device, wherein the electrical device comprises the above-mentioned battery.

[0007] According to a first aspect of the utility model, an electrode terminal is provided, comprising: a pole; a cap, wherein the cap and the pole are different metal parts, and at least a portion of the cap is integrally connected to an axial end of the pole.

[0008] Optionally, the pole and the cap are connected to each other as a whole by welding or sintering.

[0009] Optionally, the electrode terminal further comprises: a sealing member, wherein the sealing member is an annular member having a channel, and the sealing member is arranged around the outer circumference of the pole.

[0010] Optionally, the cap has a first area and a second area, and the portion of the cap corresponding to the first area is connected to one axial end of the pole, and the electrode terminal also includes: a solder layer, the solder layer is located between the cap and the seal, and the portion of the cap corresponding to the second area is connected to the seal through the solder layer.

[0011] Optionally, the second area is arranged around the periphery of the first area.

[0012] Optionally, the pole comprises: a column; a wing portion, wherein the wing portion is arranged at one axial end of the column, an outer edge of the wing portion exceeds an outer side surface of the column, and the wing portion and the cap are connected to each other as a whole.

[0013] Optionally, the seal, the pole and the cap are welded or sintered to form an integrated assembly.

[0014] Optionally, the sealing element is a metallized ceramic ring or a non-metallized ceramic ring.

[0015] Optionally, the electrode terminal is a negative terminal, the pole is a copper pole, and the cap is an aluminum cap.

[0016] According to the second aspect of the utility model, a battery cover plate assembly is provided, comprising: a cover plate, on which a mounting hole is provided; a positive terminal and a negative terminal, the positive terminal or the negative terminal being mounted in the mounting hole, and the positive terminal and / or the negative terminal being any of the electrode terminals described above.

[0017] According to a third aspect of the utility model, a battery is provided, comprising any one of the above-mentioned battery cover plate assemblies.

[0018] According to a fourth aspect of the utility model, there is provided an electrical device comprising any of the above-mentioned batteries.

[0019] According to the electrode terminal of the embodiment of the utility model, the cap and the pole are made of different metal parts, and at least a part of the cap is connected to one end of the pole in the axial direction as a whole, which can save solder, reduce production costs, and simplify the process.

[0020] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0022] Figure 1 An exploded view of an electrode terminal provided in one embodiment of the utility model;

[0023] Figure 2 An assembly diagram of an electrode terminal provided for one embodiment of the utility model;

[0024] Figure 3 This is an exploded view of an electrode terminal according to yet another embodiment of the present utility model.

[0025] Reference numerals:

[0026] Electrode terminal 100;

[0027] Pole 10; column 11; wing 12;

[0028] Cap 20; first area 21; second area 22;

[0029] Seal 30; Channel 31;

[0030] Solder layer 40 . DETAILED DESCRIPTION

[0031] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0032] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0033] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0034] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0035] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0036] The electrode terminal 100 according to the embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0037] like Figures 1 to 3 As shown, the electrode terminal 100 according to the embodiment of the present invention includes a pole 10 and a cap 20 .

[0038] Specifically, the cap 20 and the pole 10 are different metal parts, and at least a portion of the cap 20 is connected to one end of the pole 10 in the axial direction as a whole. The cap 20 can be completely disposed at one end of the pole 10, or can be partially disposed at one end of the pole 10. For example, a portion of the cap 20 is connected to one end of the pole 10 through solid phase diffusion.

[0039] It should be noted that the cap 20 and the pole 10 are directly connected, for example, by solid-phase diffusion. Compared with the prior art, in the electrode terminal 100 of this embodiment, no solder is required when connecting the cap 20 and the pole 10, thereby saving the amount of solder and reducing the risk of brazing voids. The use of raw materials is reduced, the assembly time is shortened, and the process is simplified, thereby reducing a large amount of cost expenditure.

[0040] For ease of explanation, the material of at least the region on the cap 20 corresponding to one end of the pole 10 can be defined as a first metal material, and the material of the pole 10 can be defined as a second metal material, and the first metal material is different from the second metal material. The different first metal material and the second metal material can be connected together by solid phase diffusion, so that at least a portion of the cap 20 is connected to the pole 10 by solid phase diffusion.

[0041] In addition, the cap 20 can be electrically connected to external electrical equipment. For example, the pole 10 is a copper pole, and the cap 20 is an aluminum cap, which can be connected to external electrical equipment. In other words, the cap 20 is provided to facilitate the current of the pole 10 to be drawn out.

[0042] Therefore, in this embodiment, by using the cap 20 and the pole 10 as different metal parts, at least a portion of the cap 20 is connected to one end of the pole 10 in the axial direction as a whole, which can save solder, reduce production costs, and simplify the process.

[0043] According to an embodiment of the utility model, the pole 10 and the cap 20 are connected to each other as a whole by welding or sintering, that is, solid-phase diffusion bonding can be achieved by welding or brazing. For example, the pole 10 is a copper pole and the cap 20 is an aluminum cap. The aluminum cap and the copper pole can be sintered or brazed to achieve solid-phase diffusion bonding between the copper pole and the aluminum cap.

[0044] In addition, when the pole 10 and the cap 20 are welded or sintered, the welded or sintered portion of the cap 20 will soften, and at least a portion of the cap 20 will form a solid solution with the pole 10 after softening. In other words, the cap 20 can form a solid solution by heating, so that the cap 20 and the pole 10 are combined by solid phase diffusion. In this embodiment, the formation of a solid solution is conducive to achieving solid phase diffusion.

[0045] It should be noted that solid-state bonding methods may include brazing, sintering, etc., wherein sintering is to heat the powder to a certain degree so that the powder is bonded together, and brazing is generally a welding process in which a flame is used to melt the brazing material and then penetrate it into the gap between the workpieces to make them adhere firmly.

[0046] In this embodiment, the pole 10 and the cap 20 are connected to each other as a whole by welding or sintering, and the cap 20 and the pole 10 are combined by solid phase diffusion, which not only ensures the connection strength between the cap 20 and the pole 10, but also reduces the production cost and simplifies the process.

[0047] In some specific embodiments of the present invention, Figure 1 to Figure 2 As shown, the electrode terminal 100 further includes a sealing member 30 . The sealing member 30 is an annular member having a channel. The sealing member 30 is disposed around the outer circumference of the electrode column 10 .

[0048] In other words, the electrode terminal 100 further includes a seal 30, which is disposed on the outer surface of the pole 10. That is, the outer side of the pole 10 may be provided with a seal 30, which may have a sealing effect. For example, when the electrode terminal 100 is installed in the mounting hole of the cover of the battery, at least a portion of the seal 30 may be sandwiched between the outer surface of the pole 10 and the inner wall surface of the mounting hole, thereby achieving a sealing effect.

[0049] Furthermore, the seal 30 may be an annular member having a channel 31, and the other end of the pole 10 may extend into the channel 31 of the seal 30. In other words, the seal 30 may be sleeved on the outside of at least a portion of the pole 10, thereby expanding the sealing range for the pole 10. Moreover, by adopting the annular seal 30, it is also helpful to improve the assembly efficiency between the seal 30 and the pole 10.

[0050] According to one embodiment of the utility model, Figure 1 and Figure 3 As shown, the cap 20 has a first region 21 and a second region 22, and the portion of the cap 20 corresponding to the first region 21 is connected to one end of the electrode 10 in the axial direction. The electrode terminal 100 further includes a solder layer 40, which is located between the cap 20 and the seal 30, and the portion of the cap 20 corresponding to the second region 22 is connected to the seal 30 through the solder layer 40. It should be noted that Figure 1 and Figure 3 The virtual dotted line in the figure is used to roughly distinguish the positions of the first area 21 and the second area 22, and does not limit the shape and range to those shown in the figure.

[0051] That is, a portion of the cap 20 corresponds to the pole 10, and another portion of the cap 20 corresponds to the seal 30. For ease of explanation, the area on the cap 20 can be defined as including a first area 21 and a second area 22, wherein the first area 21 corresponds to the pole 10, and the second area 22 corresponds to the seal 30.

[0052] In this embodiment, by connecting different positions of the cap 20 to the pole 10 and the seal 30 respectively, the structure of the cap 20 is simplified, and the pole 10 and the seal 30 can be connected to the cap 20 at the same time.

[0053] In addition, the cap 20 and the seal 30 can be connected through the solder layer 40, which reduces the difficulty of connecting the cap 20 and the seal 30. That is, the solder layer 40 is provided between the cap 20 and the seal 30, that is, the solder layer 40 can be provided between the second region 22 and the seal 30. Figure 1 As shown, the solder layer 40 realizes the connection between the cap 20 and the sealing member 30. For example, the cap 20 is an aluminum cap, the sealing member 30 is a ceramic ring, and an aluminum silicon welding sheet can be arranged between the aluminum cap and the ceramic ring.

[0054] In some specific embodiments of the present invention, Figure 1 and Figure 3 As shown, the second area 22 is arranged around the periphery of the first area 21. For example, a part of the cap 20 corresponds to the pole 10, and another part of the cap 20 exceeds the outer periphery of the pole 10 and corresponds to the seal 30. The first area 21 may correspond to the end of the pole 10, and the second area 22 may exceed the edge of the pole 10. In this embodiment, by arranging the second area 22 around the periphery of the first area 21, the area of ​​the connection area between the cap 20 and the seal 30 can be guaranteed, and the positional relationship between the seal 30 and the pole 10 after assembly can also be used to simplify the overall structure of the cap 20, the seal 30 and the pole 10. For example, after the seal 30 is sleeved on the periphery of the pole 10, the cap 20 is located above the pole 10 and the seal 30 at the same time. At this time, the area on the upper surface of the pole 10 corresponding to the cap 20 is the first area 21, and the area on the upper surface of the annular seal 30 corresponding to the cap 20 is the second area 22.

[0055] According to an embodiment of the utility model, the pole 10 includes a column 11 and a wing 12, the wing 12 is arranged at one end of the column 11 in the axial direction, the outer edge of the wing 12 exceeds the outer side of the column 11, and the wing 12 is connected to the cap 20 as a whole. For example, the column 11 extends in the up-down direction, the wing 12 is arranged at the upper end of the column 11, and after the seal 30 is sleeved on the column 11, the wing 12 can be located above the seal 30, and the seal 30 can be located on the outer periphery of the column 11.

[0056] That is to say, the pole 10 includes a column 11 and a wing 12, the column 11 is a cylindrical part, a seal 30 is sleeved on the column 11, the wing 12 is arranged at one end of the column 11, the outer periphery of the wing 12 exceeds the outer periphery of one end of the column 11, the wing 12 and the cap 20 are connected to each other as a whole, and the cap 20 and the wing 12 are connected by solid phase diffusion.

[0057] Optionally, the seal 30 may be connected to the column 11 and / or the wing 12, which is flexible and can be selected according to product requirements and specific processes.

[0058] Optionally, the pole 10 is an integrated piece, which is easy to process and manufacture.

[0059] In some specific embodiments of the present invention, the seal 30, the pole 10 and the cap 20 are welded or sintered to form an integrated assembly. For example, the seal 30, the pole 10 and the cap 20 are connected to form an integrated assembly by a brazing process. The brazing process has the advantage of being easy to implement. Figure 3 As shown, the pole 10 is connected to the seal 30, and the pole 10 is also combined with the cap 20 by solid phase diffusion, which is conducive to forming the seal 30, the pole 10 and the cap 20 into an assembly, which is not only convenient for subsequent installation, but also conducive to improving air tightness. In addition, the wing 12 is also convenient for limiting the seal 30 and increasing the contact area between it and the seal 30.

[0060] Optionally, the pole 10 is subjected to an anti-oxidation treatment to reduce oxidation of the finished product and improve the yield of the finished product. For example, the copper pole is subjected to an anti-oxidation treatment to avoid affecting the operation of the battery pack.

[0061] According to an embodiment of the present invention, the sealing member 30 is a metallized ceramic ring or a non-metallized ceramic ring.

[0062] That is to say, in this embodiment, the sealing member 30 is a ceramic ring, wherein the ceramic ring can be a metallized ceramic ring or a non-metallized ceramic ring.

[0063] It should be noted that when the sealing member 30 is made of an insulating material, such as a ceramic ring, the sealing member 30 can also play an insulating effect.

[0064] In some specific embodiments of the present invention, the electrode terminal 100 further includes a cover plate connector (not shown in the figure), which is provided on the sealing member 30 and can be connected to the cover plate, that is, the cover plate connector is connected to the sealing member 30 and the cover plate respectively. It can be seen that the cover plate connector can play a transition role, for example, the cover plate connector is covered on the lower end of the sealing member 30, the upper end of the cover plate connector is connected to the sealing member 30, and the lower end or side of the cover plate connector can be connected to the cover plate of the battery. Therefore, the indirect assembly between the sealing member 30 and the cover plate can be realized through the cover plate connector, reducing the difficulty of directly connecting the sealing member 30 to the cover plate. Optionally, the cover plate connector can be directly connected to the cover plate, or connected to the cover plate through a disc, etc.

[0065] Wherein, when a non-metallized ceramic ring is used as the sealing member 30, a cover plate connector may be provided on the lower end face of the non-metallized ceramic ring. It should be noted that when a non-metallized ceramic ring is used, the non-metallization of the ceramic ring can reduce the risk of brazing voids. When a metallized ceramic ring is used, a cover plate connector may not be required, and the metallized ceramic ring may be directly welded to the metal. When preparing the metallized ceramic ring, processes such as silk screen printing may be used.

[0066] In some specific embodiments of the present invention, the electrode terminal 100 is a negative electrode terminal, the pole 10 is a copper pole, and the cap 20 is an aluminum cap.

[0067] The following is a detailed description by taking the example that the sealing member 30 is a ceramic ring, the pole 10 is a copper pole, and the cap 20 is an aluminum cap.

[0068] First, the jig is assembled in the order of ceramic ring → aluminum silicon welding sheet → copper column → aluminum cap; then, the assembled jig can be brazed at a temperature of 560°C to 620°C; finally, the brazed sample can be post-processed.

[0069] It can be seen that by using aluminum caps, copper columns, aluminum silicon welding sheets and ceramic rings as raw materials, sample preparation can be completed within a relatively low brazing temperature range. In addition, the seal 30, the pole 10 and the cap 20 can be welded once to form an assembly, for example, the aluminum cap is welded with the copper column in a solid phase bonding manner, and the aluminum cap is brazed with the ceramic ring to complete the preparation of the negative electrode conductive column of the battery.

[0070] In addition, the following process can be used: first sinter the aluminum cap and copper column, and then sinter the sintered sample with the ceramic ring, which can stably prepare samples with better performance. By adopting the steps of sintering in stages, stability can be ensured, the required softening temperature and pressure can be reduced, the overflow of the solder sheet and the ion dissociation in the battery pack can be avoided, and the power supply effect of the battery pack can be optimized.

[0071] The electrode terminal 100 according to the embodiment of the utility model is described in detail below in conjunction with specific embodiments.

[0072] Example

[0073] (1) The assembly sequence is as follows: ceramic ring → copper column → aluminum silicon welding sheet → aluminum cap, and the jig is assembled.

[0074] (3) Brazing the assembled fixture.

[0075] (4) Post-process the brazed samples.

[0076] Comparative Example

[0077] A ceramic ring is sleeved on the outer periphery of the copper column, and a nickel cap is connected to the upper end of the copper column through solder. It should be noted that the ceramic ring and the copper column in the embodiment and the comparative example are made of the same material.

[0078] The products of the above-mentioned embodiments and comparative examples were tested as follows:

[0079] First, air tightness test

[0080] Tested using a helium mass spectrometer (helium spray method)

[0081] Place the sample to be tested in the tooling, connect the tooling to the detection port of the helium mass spectrometer and lock it to ensure that there is no gap. Evacuate the inner tank of the helium mass spectrometer, and when the vacuum reaches a specific value, spray helium into the connection. If the instrument detects a helium reaction, it means that the sample is not airtight and there is a large gap.

[0082] After testing, the test result of the embodiment is 3.51*10 -9 pa*m 3 / s; the test result of the comparative ratio is 1.25*10 - 8 pa*m 3 / s.

[0083] It can be seen from the air tightness test results that the product of the embodiment has better air tightness, while the product of the comparative example has poor air tightness.

[0084] Second, welding tensile test

[0085] The welding tensile test adopts GB / T13477.12-2006 to test the joint strength.

[0086] The test results of the embodiment are: the ceramic is torn and cracked, and the aluminum cap is yielded.

[0087] The test results of the comparative example are: the solder layer is detached, the ceramic is cracked, and the copper column is broken.

[0088] It can be seen from the welding tensile test results that the bonding strength between the ceramic ring and the copper column of the embodiment is greater than the bonding strength between the ceramic and the copper column of the comparative example.

[0089] It can be seen that the electrode terminal according to the embodiment of the utility model has the advantages of simple process, high product bonding strength, high tensile strength, airtightness that meets the detection standards, and greatly reduced costs.

[0090] The utility model also provides a battery cover assembly, which includes a cover, a positive terminal and a negative terminal. Specifically, the cover is provided with a mounting hole, and the positive terminal or the negative terminal is mounted in the mounting hole, and the positive terminal and / or the negative terminal is the electrode terminal 100 of any of the above-mentioned embodiments. Since the cap 20 and the pole 10 of the electrode terminal 100 of the embodiment of the utility model are different metal parts, at least a part of the cap 20 is connected to one end of the pole 10 in the axial direction, which is conducive to saving solder, and when the solid phase bonding method is used for connection, it also has the advantages of good air tightness and high bonding strength. Therefore, the battery cover assembly of the embodiment of the utility model also has the same advantages, which will not be repeated here.

[0091] The utility model also provides a battery, which includes a battery cover assembly of any of the above embodiments. Since the battery cover assembly of the utility model embodiment has advantages such as good airtightness, the battery pack of the utility model embodiment also has the same advantages, such as cost saving and good safety performance, which will not be elaborated here.

[0092] The utility model also provides an electric device, which includes a battery of any of the above embodiments. Since the battery of the utility model embodiment has advantages such as good airtightness and low cost, the electric device of the utility model embodiment also has the same advantages, which will not be described in detail. In addition, the electric device of the utility model embodiment can be but is not limited to a vehicle.

[0093] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. An electrode terminal (100), characterized in that: include: Pole (10); A cap (20), wherein the cap (20) and the pole (10) are different metal parts, and at least a portion of the cap (20) and an axial end of the pole (10) are connected to each other as a whole.

2. The electrode terminal (100) according to claim 1, characterized in that: The pole (10) and the cap (20) are connected to each other as a whole through welding or sintering.

3. The electrode terminal (100) according to claim 1, characterized in that: Also includes: A sealing member (30), wherein the sealing member (30) is an annular member having a channel, and the sealing member (30) is arranged around the outer circumference of the pole (10).

4. The electrode terminal (100) according to claim 3, characterized in that: The cap (20) has a first region (21) and a second region (22), a portion of the cap (20) corresponding to the first region (21) is connected to an axial end of the pole (10), and the electrode terminal (100) further comprises: A solder layer (40), the solder layer (40) being located between the cap (20) and the sealing member (30), and a portion of the cap (20) corresponding to the second region (22) being connected to the sealing member (30) via the solder layer (40).

5. The electrode terminal (100) according to claim 4, characterized in that: The second area (22) is arranged around the outer periphery of the first area (21).

6. The electrode terminal (100) according to claim 1, characterized in that: The pole (10) comprises: Column (11); A wing portion (12), wherein the wing portion (12) is arranged at one axial end of the column (11), the outer edge of the wing portion (12) exceeds the outer side surface of the column (11), and the wing portion (12) and the cap (20) are connected to each other as a whole.

7. The electrode terminal (100) according to claim 3, characterized in that: The sealing member (30), the pole (10) and the cap (20) are welded or sintered to form an integrated assembly.

8. The electrode terminal (100) according to claim 3, characterized in that: The sealing element (30) is a metallized ceramic ring or a non-metallized ceramic ring.

9. The electrode terminal (100) according to claim 1, characterized in that: The electrode terminal (100) is a negative electrode terminal, the pole (10) is a copper pole, and the cap (20) is an aluminum cap.

10. A battery cover assembly, characterized in that: include: A cover plate, wherein a mounting hole is provided on the cover plate; A positive terminal and a negative terminal, the positive terminal or the negative terminal is installed in the installation hole, the positive terminal is the electrode terminal (100) according to any one of claims 1-8, and / or the negative terminal is the electrode terminal (100) according to any one of claims 1-9.

11. A battery, characterized in that: Includes the battery cover assembly as described in claim 10.

12. An electrical equipment, characterized in that: Comprising the battery of claim 11.

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