Copper-aluminum composite pole and battery cover plate

Abstract

The application relates to the technical field of batteries, in particular to a copper-aluminum composite pole and a battery cover plate. The copper-aluminum composite pole comprises a copper layer part and an aluminum layer part, and the copper-aluminum composite pole comprises a column structure and a plate structure, and the plate structure is integrally connected with one end of the column structure in a first direction. The first part of the plate structure and the column structure is the copper layer part, the first part is the part of the column structure close to the one end of the plate structure, and the second part of the column structure is the aluminum layer part. The size of the first part in the first direction is greater than or equal to 0.2 mm. According to the copper-aluminum composite pole and the battery cover plate, the copper layer part and the aluminum layer part of the copper-aluminum composite pole are stable in combination, so that the structure of the copper-aluminum composite pole can be kept stable under the working condition of vibration and bumping.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of batteries, in particular to a copper-aluminum composite pole and a battery cover plate. BACKGROUND

[0002] At present, the negative pole of a battery is usually designed as a copper-aluminum composite structure to ensure the welding performance of the negative pole. However, in the existing copper-aluminum composite pole, the proportion between the copper layer part and the aluminum layer part of the negative pole is difficult to determine. If the proportion of the copper layer part is too high, the manufacturing cost of the negative pole is greatly increased. If the proportion of the copper layer part is insufficient, the connection stability of the copper layer part and the aluminum layer part of the negative pole is poor, and the negative pole is prone to break at the junction of the copper-aluminum composite under the working condition of vibration and bumping. SUMMARY

[0003] The application aims to provide a copper-aluminum composite pole and a battery cover plate to solve the technical problem that in the existing copper-aluminum composite pole, the proportion between the copper layer part and the aluminum layer part of the negative pole is difficult to determine, if the proportion of the copper layer part is too high, the manufacturing cost of the negative pole is greatly increased, and if the proportion of the copper layer part is insufficient, the connection stability of the copper layer part and the aluminum layer part of the negative pole is poor, and the negative pole is prone to break at the junction of the copper-aluminum composite under the working condition of vibration and bumping.

[0004] According to a first aspect of the application, a copper-aluminum composite pole is provided, which comprises a copper layer part and an aluminum layer part, and comprises a pole body structure and a plate body structure, the plate body structure is integrally connected with one end of the pole body structure in a first direction;

[0005] The first part of the plate body structure and the first part of the pole body structure are both the copper layer part, the first part is arranged at the end of the pole body structure close to the plate body structure, and the second part of the pole body structure is the aluminum layer part.

[0006] The size of the first part in the first direction is greater than or equal to 0.2 mm.

[0007] Preferably, the size of the first part in the first direction is less than or equal to 0.7 mm in the first direction.

[0008] Preferably, the pole body structure is a cylinder, and the outer diameter of the pole body structure is greater than or equal to 5 mm.

[0009] Preferably, the outer diameter of the pole body structure is less than or equal to 15 mm.

[0010] Preferably, the copper-aluminum composite pole is a copper-aluminum friction welding piece or a copper-aluminum roll pressure composite piece.

[0011] Preferably, the temperature for use of the copper-aluminum composite pole is less than or equal to 350℃.

[0012] According to the second aspect of the present application, a battery cover plate is provided, comprising a cover plate body and a negative pole assembly, the negative pole assembly comprising a negative riveting block and the copper-aluminum composite pole according to any one of the above embodiments, thus having all the beneficial technical effects of the copper-aluminum composite pole, which will not be repeated here.

[0013] Specifically, the pole body structure of the copper-aluminum composite pole penetrates the cover plate body along the first direction and is connected with the negative riveting block.

[0014] Preferably, the battery cover plate further comprises a positive pole assembly, the positive pole assembly comprising a positive pole and a positive riveting block, part of the positive pole penetrating the cover plate body along the first direction and being connected with the positive riveting block.

[0015] The positive pole, the positive riveting block and the negative riveting block are all made of aluminum.

[0016] Preferably, the battery cover plate further comprises a cover plate insulating member, the cover plate insulating member covering the side of the battery cover plate opposite to the negative riveting block.

[0017] Part of the cover plate insulating member extends between the plate body structure and the cover plate body.

[0018] Preferably, the negative pole assembly further comprises:

[0019] a negative insulating member arranged between the negative riveting block and the cover plate body;

[0020] a negative sealing ring sleeved on the outside of the pole body structure, and both ends of the negative sealing ring in the first direction being connected with the negative insulating member and the cover plate insulating member, respectively.

[0021] Compared with the prior art, the present application has the following beneficial effects:

[0022] The copper-aluminum composite pole provided by the present application extends the copper layer part in the copper-aluminum composite pole from the plate body structure to the pole body structure, and makes the extension length of the copper layer part on the pole body structure, i.e. the size of the first part in the first direction (i.e. the value of h shown in the figure) greater than or equal to 0.2mm, so that the copper layer part and the aluminum layer part of the copper-aluminum composite pole are combined stably, which can ensure that the copper-aluminum composite pole remains stable in the working condition of vibration and jolt. Figure 2

[0023] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, together with the accompanying drawings. ​BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the present application, the drawings needed to be used in the description of the specific embodiments or prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0025] Figure 1 The axonometric structural schematic diagram of the copper-aluminum composite pole provided by the embodiment of the present application is shown in the figure.

[0026] Figure 2 The cross-sectional structural schematic diagram of the copper-aluminum composite pole provided by the embodiment of the present application is shown in the figure.

[0027] Figure 3 The axonometric structural schematic diagram of the battery cover plate provided by the embodiment of the present application is shown in the figure.

[0028] Figure 4 The front view structural schematic diagram of the battery cover plate provided by the embodiment of the present application is shown in the figure.

[0029] Figure 5 The cross-sectional structural schematic diagram of the copper-aluminum composite pole provided by the embodiment of the present application is shown in the figure. Figure 4 The cross-sectional structural schematic diagram of the copper-aluminum composite pole provided by the embodiment of the present application is shown in the figure.

[0030] Figure 6 The enlarged structural schematic diagram of the copper-aluminum composite pole at B provided by the embodiment of the present application is shown in the figure. Figure 5 The enlarged structural schematic diagram of the copper-aluminum composite pole at B provided by the embodiment of the present application is shown in the figure.

[0031] Figure 7 The axonometric structural schematic diagram of the battery cover plate provided by the embodiment of the present application is shown in the figure.

[0032] Figure 8 The cross-sectional structural schematic diagram of the battery cover plate provided by the embodiment of the present application is shown in the figure.

[0033] Figure 9 The axonometric structural schematic diagram of the copper-aluminum composite pole provided by the embodiment of the present application is shown in the figure.

[0034] Figure 10 The curve of IMC layer thickness changing with annealing temperature.

[0035] Reference signs:

[0036] 1-negative pole assembly; 11-copper-aluminum composite pole; 111-pole structure; 1111-first part; 1112-second part; 112-plate structure; 12-negative riveting block; 13-negative insulating piece; 14-negative sealing ring; 2-positive pole assembly; 21-positive pole; 211-pole part; 212-plate part; 22-positive riveting block; 23-positive insulating piece; 24-positive sealing ring; 3-cover plate body; 31-cover plate insulating piece; 4-explosion-proof valve; 5-liquid injection hole.

[0037] F1-first direction; F2-second direction; F3-third direction. DETAILED DESCRIPTION

[0038] The technical solutions of the present application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0039] The components of the embodiments of the present application generally described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application.

[0040] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0041] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] The following will be described with reference to the accompanying drawings Figures 1 to 6The copper-aluminum composite pole 11 and the battery cover plate according to some embodiments of the present application are described.

[0044] Referring to Figures 1 to 6 As shown in the first aspect of the present application, the embodiments provide a copper-aluminum composite pole 11, which includes a copper layer part and an aluminum layer part. The copper-aluminum composite pole 11 includes a column structure 111 and a plate structure 112, and the plate structure 112 is integrally connected to one end of the column structure 111 in a first direction F1. Wherein the plate structure 112 and the first part 1111 of the column structure 111 are both copper layer parts, the first part 1111 is arranged at the end of the column structure 111 close to the plate structure 112, and the second part 1112 of the column structure 111 is an aluminum layer part. The size of the first part 1111 in the first direction F1 (i.e. Figure 2 The h value shown is greater than or equal to 0.2 mm.

[0045] The applicant selects copper-aluminum composite poles 11 with different data of the size of the first part 1111 in the first direction F1 under the condition that other structure sizes are the same, and respectively carries out copper-aluminum composite pole 11 drawing test and side push test. Table 1 shows the size data and corresponding test results of the drawing test and side push test of the above-mentioned copper-aluminum composite pole 11.

[0046] It should be noted that the drawing test of the above-mentioned copper-aluminum composite pole 11 can be understood as using a tensile testing machine (for example, a universal tensile testing machine) to act on both ends of the copper-aluminum composite pole 11 in the first direction F1, drawing the copper-aluminum composite pole 11 along the first direction F1, and recording the tensile force value when the copper-aluminum composite pole 11 is broken (i.e. the drawing strength value of the copper-aluminum composite pole 11 shown in Table 1), wherein the drawing strength of the copper-aluminum composite pole 11 is between 75-95 Mpa, and the tensile strength of the copper-aluminum composite pole 11 is considered to be qualified. And observe the breaking position of the copper-aluminum composite pole 11.

[0047] In addition, the side push test of the above-mentioned copper-aluminum composite pole 11 can be understood as applying side pushing forces perpendicular to the first direction F1 and opposite to each other in value on both ends of the copper-aluminum composite pole 11 in the first direction F1 to observe the breaking position of the copper-aluminum composite pole 11 under the action of shear stress.

[0048] Table 1:

[0049]

[0050] As shown in Table 1, when the outer diameter d of the column structure 111 is the same, and the dimension h of the first part 1111 in the first direction F1 is less than 0.2 mm, regardless of whether d=5 mm, d=8 mm, d=12 mm, or d=15 mm, the fracture location in both the pull-out and lateral push tests is the copper-aluminum interface. However, when the dimension h of the first part 1111 in the first direction F1 is greater than or equal to 0.2 mm, regardless of whether d=5 mm, d=8 mm, d=12 mm, or d=15 mm, the fracture location in both the pull-out and lateral push tests is not at the copper-aluminum interface. In other words, extending the copper layer in the copper-aluminum composite pole 11 from the plate structure 112 to the column structure 111, and ensuring that the extension length of the copper layer on the column structure 111 is equal to the dimension of the first part 1111 in the first direction F1 (i.e.,... Figure 2 If the h value shown is greater than or equal to 0.2 mm, the copper layer and aluminum layer of the copper-aluminum composite pole 11 are stably bonded, which can ensure that the copper-aluminum composite pole 11 maintains structural stability under vibration and bumpy working conditions.

[0051] Preferably, in the first direction F1, the dimension h of the first part 1111 in the first direction F1 is less than or equal to 0.7 mm, as shown in Table 1. On the one hand, when 0.2 mm ≤ h of the copper-aluminum composite electrode 11, both the copper layer and the aluminum layer of the copper-aluminum composite electrode 11 can be stably bonded. On the other hand, making h ≤ 0.7 mm of the copper-aluminum composite electrode 11 can effectively balance the manufacturing cost of the copper-aluminum composite electrode 11.

[0052] like Figures 1 to 6 As shown in the figure, F1 can be an example of the first direction F1 described above. For ease of description, two directions perpendicular to each other on a plane perpendicular to the first direction F1 are defined as the second direction F2 and the third direction F3. F2 shown in the figure can be an example of the second direction F2 described above, and F3 shown in the figure can be an example of the third direction F3 described above.

[0053] Preferably, such as Figure 1 As shown, the above-mentioned column structure 111 can be a cylinder to facilitate the processing and manufacturing of the column structure 111.

[0054] Preferably, the outer diameter of the above-mentioned column structure 111 (i.e. Figure 2 The d value shown can be greater than or equal to 5 mm. Referring to Table 2, when the outer diameter d of the column structure 111 is less than 5 mm, the tensile strength of the copper-aluminum composite pole 11 is unqualified regardless of whether the h value is greater than 0.2 mm or greater than 0.7 mm, and the bonding stability between the copper layer and the aluminum layer is poor.

[0055] Table 2:

[0056]

[0057] Preferably, the outer diameter of the column structure 111 (i.e. Figure 2 The value of d shown can be less than or equal to 15 mm to accommodate most battery cover plate structures.

[0058] Optionally, the copper-aluminum composite pole 11 described above can be a copper-aluminum friction welding piece.

[0059] Optionally, the copper-aluminum composite pole 11 described above can be a copper-aluminum roll-bonded piece.

[0060] Preferably, the use temperature of the copper-aluminum composite pole 11 described above can be less than or equal to 350°C, so that, as shown in Figure 10 The IMC (i.e. intermetallic compound) layer thickness changes with the annealing temperature, when the use temperature of the copper-aluminum composite pole 11 can be less than or equal to 350°C, the thickness of the IMC generated at the copper-aluminum bonding surface of the copper-aluminum composite pole 11 under high temperature conditions can be effectively reduced, thereby avoiding the influence of the IMC on the bonding stability of the copper layer and the aluminum layer.

[0061] It should be noted that the column structure described above is not limited to Figure 1 The cylindrical structure shown, as long as the connection strength of the copper layer and the aluminum layer can be ensured, the column structure described above can also be other column structures, for example, Figure 9 The elliptical column structure shown, or other polygonal columns, special-shaped columns, etc.

[0062] As shown in Figures 3 to 6 The second aspect of the embodiments of the present application also provides a battery cover plate, comprising a cover plate body 3 and a negative pole assembly 1, the negative pole assembly 1 comprising a negative riveting block 12 and the copper-aluminum composite pole 11 described in any of the embodiments described above, thus, having all the beneficial technical effects of the copper-aluminum composite pole 11, which will not be described here.

[0063] Specifically, as shown in Figures 3 to 6 The column structure 111 of the copper-aluminum composite pole 11 described above penetrates the cover plate body 3 along the first direction F1 and is connected with the negative riveting block 12.

[0064] Preferably, as shown in Figures 3 to 6 The battery cover plate described above can also comprise a cover plate insulating piece 31, which is covered on the side of the battery cover plate opposite to the negative riveting block 12 to realize the insulation between the cover body and the inside of the battery. Preferably, as shown in Figure 6 Part of the cover plate insulating piece 31 described above extends between the plate body structure 112 and the cover plate body 3 to facilitate the insulation between the plate body structure 112 and the cover plate body 3.

[0065] Preferably, as shown in Figures 3 to 6 The negative pole post assembly 1 can further include a negative pole insulation piece 13, which can be arranged between the negative pole riveting block 12 and the cover plate body 3 to achieve insulation between the negative pole riveting block and the cover plate body 3.

[0066] Preferably, as shown in Figures 3 to 6 The negative pole post assembly 1 can further include a negative pole sealing ring 14, which can be sleeved on the outer side of the post structure 111 to prevent the part of the post structure 111 penetrating through the cover plate body 3 from contacting the cover plate body 3. And the two ends of the negative pole sealing ring 14 in the first direction F1 are connected with both the negative pole insulation piece 13 and the cover plate insulation piece 31, so that the negative pole post assembly 1 can be completely insulated from the cover plate body 3.

[0067] Optionally, the negative pole riveting block 12 can be riveted and fixed on the cover plate body 3 via a plurality of copper-aluminum composite poles 11 to improve the riveting stability and flatness of the negative pole riveting block 12. As shown in Figure 7 and Figure 8 The negative pole riveting block 12 is riveted and fixed on the cover plate body 3 via two copper-aluminum composite poles 11, but it is not limited to this, and the number of copper-aluminum composite poles 11 can be adaptively adjusted according to the size of the negative pole riveting block 12.

[0068] Optionally, as shown in Figure 7 and Figure 8 The battery cover plate only includes a negative pole post assembly. In other words, the battery cover plate can be applicable to a battery, such as a blade battery, in which the negative pole post assembly and the positive pole post assembly are respectively arranged at the two ends of the battery in the first direction, and the example of the battery cover plate only including the negative pole post assembly is shown in the figure.

[0069] However, it is not limited to this, and optionally, as shown in Figures 3 to 5 The battery cover plate can further include a positive pole post assembly 2. Correspondingly, as shown in Figure 5 The positive pole post assembly 2 can also include a positive pole 21 and a positive pole riveting block 22, part of the positive pole 21 penetrates through the cover plate body 3 in the first direction F1 and is connected with the positive pole riveting block 22.

[0070] Similarly, as shown in Figure 5 The positive pole 21 can also include a plate part 212 and a post part 211 fixedly connected with each other, wherein the post part 211 penetrates through the cover plate body 3 in the first direction F1 and is connected with the positive pole riveting block 22, and the plate part 212 is clamped on the side of the cover plate body 3 away from the positive pole riveting block 22.

[0071] Correspondingly, as shown in Figure 5As shown, part of the cover plate insulating member 31 can also extend between the plate portion 212 and the cover plate body 3, so as to realize insulation between the plate portion 212 and the cover plate body 3.

[0072] Similarly, as Figure 5 As shown, the positive pole post assembly 2 can also include a positive pole insulating member 23 and a positive pole sealing ring 24. The positive pole insulating member 23 can be arranged between the positive pole riveting block 22 and the cover plate body 3, so as to realize insulation between the positive pole riveting block and the cover plate body 3. The positive pole sealing ring 24 can be sleeved on the outside of the post portion 211, so as to prevent the part of the post portion 211 penetrating through the cover plate body 3 from contacting the cover plate body 3. And the two ends of the positive pole sealing ring 24 in the first direction F1 are connected with the positive pole insulating member 23 and the cover plate insulating member 31 respectively, so that the positive pole post assembly 2 can be completely insulated from the cover plate body 3.

[0073] Preferably, the positive pole post 21, the positive pole riveting block 22 and the negative pole riveting block 12 are all aluminum pieces.

[0074] Optionally, as Figures 3 to 5 As shown, the positive pole post assembly 2 and the negative pole post assembly 1 are arranged at intervals in the second direction F2, so as to prevent the positive pole post assembly 2 and the negative pole post assembly 1 from interfering with each other in electrical connection.

[0075] Preferably, as Figures 3 to 5 As shown, the battery cover plate can also include an explosion-proof valve 4, so as to ensure the safety of the battery. The explosion-proof valve 4 can be arranged at the part of the cover plate body 3 between the positive pole post assembly 2 and the negative pole post assembly 1, so as to utilize the space of the cover plate body 3 between the positive pole post assembly 2 and the negative pole post assembly 1, and improve the space utilization of the battery cover plate.

[0076] Preferably, as Figures 3 to 5 As shown, the battery cover plate can also include a liquid injection hole 5, so as to inject liquid into the battery. The liquid injection hole 5 can also be arranged at the part of the cover plate body 3 between the positive pole post assembly 2 and the negative pole post assembly 1, so as to utilize the space of the cover plate body 3 between the positive pole post assembly 2 and the negative pole post assembly 1, and improve the space utilization of the battery cover plate.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part or all of the technical features. Such modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A copper-aluminum composite electrode, characterized in that, The copper-aluminum composite electrode includes a copper layer and an aluminum layer. The copper-aluminum composite electrode includes a column structure and a plate structure. The plate structure is integrally connected to one end of the column structure in a first direction. Wherein, the first part of both the plate structure and the column structure is the copper layer, the first part is disposed at one end of the column structure near the plate structure, and the second part of the column structure is the aluminum layer; The dimension of the first part in the first direction is greater than or equal to 0.2 mm; In the first direction, the dimension of the first portion in the first direction is less than or equal to 0.7 mm; The copper-aluminum composite pole is a copper-aluminum friction welded part or a copper-aluminum roll-pressed composite part.

2. The copper-aluminum composite electrode according to claim 1, characterized in that, The column structure is a cylinder, and the outer diameter of the column structure is greater than or equal to 5mm.

3. The copper-aluminum composite electrode according to claim 2, characterized in that, The outer diameter of the column structure is less than or equal to 15 mm.

4. The copper-aluminum composite electrode according to claim 1, characterized in that, The column structure is an elliptical column, a polygonal column, or an irregularly shaped column.

5. The copper-aluminum composite electrode according to any one of claims 1 to 4, characterized in that, The copper-aluminum composite electrode is used at a temperature of less than or equal to 350°C.

6. A battery cover, characterized in that, It includes a cover plate body and a negative electrode post assembly, wherein the negative electrode post assembly includes a negative electrode riveting block and a copper-aluminum composite electrode post as described in any one of claims 1 to 5. The column structure of the copper-aluminum composite electrode extends through the cover plate body along the first direction and is connected to the negative electrode riveting block.

7. The battery cover according to claim 6, characterized in that, It also includes a positive electrode post assembly, which includes a positive electrode post and a positive electrode riveting block. A portion of the positive electrode post penetrates the cover plate body along the first direction and is connected to the positive electrode riveting block. The positive electrode post, the positive electrode riveting block, and the negative electrode riveting block are all made of aluminum.

8. The battery cover according to claim 6, characterized in that, The battery cover also includes a cover insulating component, which covers the side of the battery cover opposite to the negative electrode riveting block. A portion of the cover plate insulation extends between the plate structure and the cover plate body.

9. The battery cover according to claim 8, characterized in that, The negative electrode assembly also includes: A negative electrode insulating component is disposed between the negative electrode riveting block and the cover plate body; A negative electrode sealing ring is sleeved on the outside of the column structure, and the two ends of the negative electrode sealing ring in the first direction are respectively connected to the negative electrode insulating component and the cover plate insulating component.

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