Pole, battery cover plate and single battery

Abstract

The invention belongs to the technical field of batteries, and discloses a pole, a battery cover plate and a single battery, the pole comprises a support and a pole body, the end face of the support is provided with a first protruding part, the first protruding part is provided with a first embedding part, the first embedding part, the first protruding part and the support are matched to form a first slot, the end face, facing the support, of the pole body is provided with a second protruding part, and the second protruding part is provided with a second slot. The first protruding part is provided with a first embedding part, the second protruding part is provided with a second embedding part, the second embedding part, the second protruding part and the column body are matched to form a second inserting groove, the first embedding part is embedded in the second inserting groove, the second embedding part is embedded in the first inserting groove, and the first protruding part and the second protruding part are oppositely arranged relative to the axis of the column body, so that the reliability of connection between the support and the column body can be improved; and the risk of pole breakage is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a pole, a battery cover and a single battery. Background Art

[0002] As lithium-ion battery technology matures, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the performance and safety of lithium-ion batteries are increasing. The pole is a component that connects the inside and outside of a lithium-ion battery. One end of the pole extends to the outside of the battery shell, and the other end is connected to the internal pole group of the battery shell, thereby realizing the function of charging and discharging.

[0003] In the prior art, the negative electrode pole is usually a copper-aluminum composite pole, such as Figure 1 As shown, the column 100' of the copper-aluminum composite pole is made of aluminum material, and the support 200' is made of copper material. In actual production, a friction welding process is often used to fix the column 100' and the support 200' together. During the welding process, as the welding stress and brittleness increase, cracks are easily generated at the joint 300' between the column 100' and the support 200', and there is a risk of pole breakage.

[0004] Therefore, it is urgent to propose a pole, a battery cover and a single battery to solve the above technical problems. Summary of the invention

[0005] The first object of the present invention is to provide a pole, which can improve the reliability of the connection between the support and the column and reduce the risk of the pole breaking.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] Pole, including:

[0008] A support, wherein the end surface of the support is provided with a first protruding portion, the first protruding portion is provided with a first engaging portion, and the first engaging portion, the first protruding portion and the support cooperate to form a first slot;

[0009] A column, wherein the end surface of the column facing the support is provided with a second protruding portion, the second protruding portion is provided with a second fitting portion, and the second fitting portion, the second protruding portion and the column cooperate to form a second slot;

[0010] The first embedding portion is embedded in the second slot, the second embedding portion is embedded in the first slot, and the first protruding portion and the second protruding portion are arranged opposite to each other about the axis of the column.

[0011] Optionally, the groove depth direction of the first slot and the groove depth direction of the second slot are both the first direction, the size of the first protrusion in the first direction is a, the size of the second protrusion in the first direction is b, and the size of the column in the first direction is c, a is 25%-40% of c, and b is 25%-40% of c.

[0012] Optionally, a and b are equal.

[0013] Optionally, the width of the first slot is d, the width of the second slot is e, and d is equal to e.

[0014] Optionally, both the first slot and the second slot are through slots.

[0015] Optionally, the first embedding portion is welded to the seam of the edge of the second slot, and the second embedding portion is welded to the seam of the edge of the first slot.

[0016] Optionally, the first engaging portion is parallel to the end surface of the support, and the second engaging portion is parallel to the radial direction of the column.

[0017] Optionally, the first protrusion is perpendicular to the end surface of the support, and the second protrusion is parallel to the axial direction of the column.

[0018] A second object of the present invention is to provide a battery cover plate, on which the probability of the pole being broken is low and the probability of the pole falling off the cover plate body is also reduced.

[0019] To achieve this object, the present invention adopts the following technical solutions:

[0020] The battery cover comprises a cover body and the above-mentioned pole, wherein the pole is arranged on the cover body.

[0021] A third object of the present invention is to provide a single cell battery having high safety in use.

[0022] To achieve this object, the present invention adopts the following technical solutions:

[0023] The single cell comprises a battery shell, an electrode group and the above-mentioned battery cover plate, wherein the electrode group is arranged in the battery shell, and the cover plate body is arranged to cover the opening of the battery shell.

[0024] Beneficial effects of the present invention:

[0025] The pole provided by the present invention has a first embedding portion on the support embedded in the second slot of the column, and the second embedding portion of the column embedded in the first slot of the support, so that the first embedding portion and the second embedding portion form an interlocking structure, which eliminates the friction welding process, improves the reliability of the connection between the support and the column, and reduces the risk of the pole breaking; and the first protruding portion and the second protruding portion are relatively arranged with respect to the axis of the column. This structural design can improve the interlocking reliability and further improve the reliability of the connection between the support and the column. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the cross-sectional structure of a copper-aluminum composite pole in the prior art;

[0027] Figure 2 is a top view of a pole provided by an embodiment of the present invention;

[0028] Figure 3 yes Figure 2 Section view in the AA direction;

[0029] Figure 4 is a front view of a pole provided by an embodiment of the present invention;

[0030] Figure 5 is a front view of a support provided by an embodiment of the present invention;

[0031] Figure 6 is a top view of a support provided by an embodiment of the present invention;

[0032] Figure 7 is a front view of a column provided by an embodiment of the present invention;

[0033] Figure 8 is a bottom view of a column provided by an embodiment of the present invention;

[0034] Fig. 9 4 is a top view of a battery cover provided by an embodiment of the present invention.

[0035] In the figure:

[0036] 100', column; 200', support; 300', joint;

[0037] 110, support; 120, first protrusion; 130, first fitting portion; 140, first slot; 210, column; 220, second protrusion; 230, second fitting portion; 240, second slot;

[0038] 10. Cover plate body; 20. Pole. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0040] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it 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 the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0043] This embodiment provides a pole, which can improve the reliability of the connection between the support and the column and reduce the risk of the pole breaking.

[0044] Specifically, Figures 2 to 8As shown, the pole 20 includes a support 110 and a column 210, wherein a first protrusion 120 is provided on the end surface of the support 110, a first engaging portion 130 is provided on the first protrusion 120, the first engaging portion 130, the first protrusion 120 and the support 110 cooperate to form a first slot 140, a second protrusion 220 is provided on the end surface of the column 210 facing the support 110, a second engaging portion 230 is provided on the second protrusion 220, the second engaging portion 230, the second protrusion 220 and the column 210 cooperate to form a second slot 240, the first engaging portion 130 is embedded in the second slot 240, the second engaging portion 230 is embedded in the first slot 140, and the first protrusion 120 and the second protrusion 220 are arranged relative to each other about the axis of the column 210.

[0045] Based on the above design, the first embedded portion 130 on the support 110 is embedded in the second slot 240 of the column 210, and the second embedded portion 230 of the column 210 is embedded in the first slot 140 of the support 110, so that the first embedded portion 130 and the second embedded portion 230 form an interlocking structure, eliminating the friction welding process, and improving the reliability of the connection between the support 110 and the column 210, and reducing the risk of the pole 20 breaking. On the other hand, the first protrusion 120 and the second protrusion 220 are arranged relative to the axis of the column 210. This structural design can improve the interlocking reliability and further improve the reliability of the connection between the support 110 and the column 210.

[0046] Alternatively, if Figures 2 to 8 As shown, the first interlocking portion 130 is parallel to the end face of the support 110 so that the two opposite inner walls of the first slot 140 are parallel to each other, and the second interlocking portion 230 is parallel to the radial direction of the column 210 so that the two opposite inner walls of the second slot 240 are parallel to each other. On the one hand, this structural design can make the structural consistency of the support 110 and the column 210 better, which is conducive to reducing the production difficulty of the support 110 and the column 210. On the other hand, it can also ensure the reliability of the first interlocking portion 130 embedded in the second slot 240 and the reliability of the second interlocking portion 230 embedded in the first slot 140, thereby ensuring the reliability of the interlocking of the first interlocking portion 130 and the second interlocking portion 230.

[0047] Alternatively, if Figures 2 to 8 As shown, the first protrusion 120 is perpendicular to the end face of the support 110, and the second protrusion 220 is parallel to the axial direction of the column 210. This structural design can make the support 110 and the column 210 have better structural consistency, which is conducive to reducing the production difficulty of the support 110 and the column 210.

[0048] Alternatively, if Figures 2 to 8As shown, the side of the first embedding portion 130 facing away from the first protruding portion 120 is fitted with the bottom of the second slot 240, thereby expanding the volume of the first embedding portion 130 embedded in the second slot 240, improving the reliability of the first embedding portion 130 embedded in the second slot 240, and further improving the reliability of the interlocking between the first embedding portion 130 and the second embedding portion 230.

[0049] Alternatively, if Figures 2 to 8 As shown, the side of the second interlocking portion 230 facing away from the second protruding portion 220 is fitted with the bottom of the first slot 140, thereby expanding the volume of the second interlocking portion 230 embedded in the first slot 140, improving the reliability of the second interlocking portion 230 embedded in the first slot 140, and further improving the reliability of the interlocking between the first interlocking portion 130 and the second interlocking portion 230.

[0050] Alternatively, if Figures 2 to 8 As shown, the first slot 140 and the second slot 240 are both through slots, which can expand the volume of the first embedded part 130 embedded in the second slot 240 and the volume of the second embedded part 230 embedded in the first slot 140, thereby improving the reliability of the interlocking of the first embedded part 130 and the second embedded part 230.

[0051] In this embodiment, the column 210 is cylindrical, and the side walls of the first protruding portion 120, the side walls of the first fitting portion 130, the side walls of the second fitting portion 230, and the side walls of the second protruding portion 220 are all arcuate surfaces, and the arcuate surfaces are matched with the side walls of the column 210. Of course, in other embodiments, the column 210 can also be other shapes such as a rectangle. When the column 210 is a rectangle, the side walls of the first protruding portion 120, the side walls of the first fitting portion 130, the side walls of the second fitting portion 230, and the side walls of the second protruding portion 220 are all planes.

[0052] Furthermore, the seams of the first fitting part 130 and the second slot 240 are welded, and the seams of the second fitting part 230 and the first slot 140 are welded. On the basis of the interlocking of the first fitting part 130 and the second fitting part 230, the seams of the first fitting part 130 and the second slot 240 are welded, and the seams of the second fitting part 230 and the first slot 140 are welded, so as to further improve the reliability of the connection between the column 210 and the support 110. Moreover, after welding at the seams, the conductive volume of the pole 20 is enlarged, which has the effect of improving the conductive capacity of the pole 20.

[0053] Alternatively, if Figures 2 to 8As shown, the groove depth direction of the first slot 140 and the groove depth direction of the second slot 240 are both in the first direction, the size of the first protrusion 120 in the first direction is a, the size of the second protrusion 220 in the first direction is b, and the size of the column 210 in the first direction is c, a is 25%-40% of c, and illustratively, a is 25%, 30% or 40% of c, etc. If the ratio of a to c is less than 25%, the structural strength of the first protrusion 120 is low. When the pole 20 is subjected to a large external push-pull force, the first protrusion 120 is prone to breakage. If the ratio of a to c is greater than 40%, the groove depth of the first slot 140 is small, so that the depth of the second fitting portion 230 embedded in the first slot 140 is small, and there is a problem of reducing the interlocking reliability of the first fitting portion 130 and the second fitting portion 230, which will further reduce the push-pull resistance of the pole 20. b is 25%-40% of c. For example, b is 25%, 30% or 40% of c. If the ratio of b to c is less than 25%, the second protrusion 220 is prone to breakage. If the ratio of b to c is greater than 40%, the depth of the second slot 240 is smaller, so that the depth of the first engaging portion 130 embedded in the second slot 240 is smaller, which reduces the interlocking reliability of the first engaging portion 130 and the second engaging portion 230.

[0054] It should be noted that in this embodiment, the cylinder 210 is cylindrical, so the above c is the diameter of the cylindrical cylinder. Of course, in other embodiments, the cylinder 210 can also be rectangular or other shapes. When the cylinder 210 is rectangular, the above c is the length of the long side of the rectangular cylinder 210.

[0055] Furthermore, a is equal to b, so that the structural strengths of the first protrusion 120 and the second protrusion 220 are substantially the same. When the pole 20 is subjected to an external force, the forces on the first protrusion 120 and the second protrusion 220 are substantially the same, so that the overall force on the pole 20 is relatively uniform, thereby reducing the probability of cracks or even breakage at a local position of the pole 20.

[0056] Alternatively, if Figures 2 to 8 As shown, the width of the first slot 140 is d, and the width of the second slot 240 is e, d is equal to e, so that the thickness g of the first embedding portion 130 is equal to the thickness f of the second embedding portion 230, so that the structural strengths of the first embedding portion 130 and the second embedding portion 230 are roughly the same. When the pole 20 is subjected to external force, the forces on the first embedding portion 130 and the second embedding portion 230 are roughly the same, so that the overall force on the pole 20 is relatively uniform, reducing the probability of cracks or even breakage of the first embedding portion 130 and the second embedding portion 230.

[0057] The pole 20 provided in this embodiment is a copper-aluminum composite pole. Specifically, the materials of the support 110, the first protruding portion 120 and the first embedded portion 130 are all copper, and the materials of the column 210, the second protruding portion 220 and the second embedded portion 230 are all aluminum. Of course, in other embodiments, the support 110, the first protruding portion 120, the first embedded portion 130, the column 210, the second protruding portion 220 and the second embedded portion 230 can also be made of other materials, and the materials of the support 110, the first protruding portion 120, the first embedded portion 130, the column 210, the second protruding portion 220 and the second embedded portion 230 can also be the same, depending on the application requirements.

[0058] This embodiment also provides a battery cover, such as Fig. 9 As shown, the battery cover includes a cover body 10 and the above-mentioned pole 20, the pole 20 is arranged on the cover body 10, the battery cover adopts the above-mentioned pole 20, the first interlocking portion 130 and the second interlocking portion 230 of the pole 20 cooperate with each other to form an interlocking structure, thereby reducing the probability of the pole 20 breaking, and also reducing the probability of the pole 20 falling from the cover body 10.

[0059] Furthermore, if Fig. 9 As shown, two poles 20 are provided on the cover body 10, one of the two poles 20 is a positive pole and the other is a negative pole. In this embodiment, the negative pole is the above-mentioned pole 20. Of course, in other implementation schemes, the positive pole can also be the above-mentioned pole 20, or both the positive pole and the negative pole can be the above-mentioned pole 20.

[0060] The present embodiment also provides a single cell battery, which includes a battery shell, a pole group and the above-mentioned battery cover. The pole group is arranged in the battery shell, and the cover body 10 is covered at the opening of the battery shell. The single cell adopts the above-mentioned battery cover, and the probability of the pole 20 breaking is low, and the probability of the pole 20 falling from the cover body 10 is low, which has the effect of improving the safety of the single cell.

[0061] To verify that in this embodiment, when a is 25%-40% of c, the pole 20 has a higher push-pull resistance, as shown in the following table, the maximum push-pull force F that the pole 20 can withstand corresponding to different ratios of a to c is selected:

[0062]

[0063]

[0064]

[0065] In Comparative Examples 1 to 9, the c value is 8 mm, and different values ​​of a are selected to obtain different ratios of a to c. Among them, when the ratio of a to c is 16%, 21%, 44% and 46%, the maximum push-pull force F that the pole 20 can withstand is less than 1000N, and when the ratio of a to c is 25%, 30%, 35%, 39% and 40%, the maximum push-pull force F that the pole 20 can withstand is greater than 1000N.

[0066] In Comparative Examples 10 to 18, the value of c is 10 mm, and different values ​​of a are selected to obtain different ratios of a to c. When the ratio of a to c is 20%, 22%, 42% and 46%, the maximum push-pull force F that the pole 20 can withstand is less than 1000N. When the ratio of a to c is 25%, 28%, 32%, 36% and 40%, the maximum push-pull force F that the pole 20 can withstand is greater than 1000N.

[0067] In Comparative Examples 19 to 27, the c value is 8.5 mm, and different values ​​of a are selected to obtain different ratios of a to c. Among them, when the ratio of a to c is 20%, 24%, 44% and 47%, the maximum push-pull force F that the pole 20 can withstand is less than 1000N, and when the ratio of a to c is 25%, 29%, 33%, 36% and 40%, the maximum push-pull force F that the pole 20 can withstand is greater than 1000N.

[0068] It can be seen that when the ratio of a to c is 25%-40%, the maximum push-pull force F that the pole 20 can withstand is ≥1000N, that is, the pole 20 has a high push-pull resistance.

[0069] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A pole, characterized in that: include: A support (110), wherein an end surface of the support (110) is provided with a first protruding portion (120), a first engaging portion (130) is provided on the first protruding portion (120), and the first engaging portion (130), the first protruding portion (120) and the support (110) cooperate to form a first slot (140); A column (210), wherein the end surface of the column (210) facing the support (110) is provided with a second protruding portion (220), the second protruding portion (220) is provided with a second fitting portion (230), and the second fitting portion (230), the second protruding portion (220) and the column (210) cooperate to form a second slot (240); The first embedding portion (130) is embedded in the second slot (240), the second embedding portion (230) is embedded in the first slot (140), and the first protruding portion (120) and the second protruding portion (220) are arranged relative to each other about the axis of the column (210).

2. The pole according to claim 1, characterized in that: The groove depth direction of the first slot (140) and the groove depth direction of the second slot (240) are both the first direction, the size of the first protrusion (120) in the first direction is a, the size of the second protrusion (220) in the first direction is b, and the size of the column (210) in the first direction is c, a is 25%-40% of c, and b is 25%-40% of c.

3. The pole according to claim 2, characterized in that: a and b are equal.

4. The pole according to any one of claims 1 to 3, characterized in that: The slot width of the first slot (140) is d, and the slot width of the second slot (240) is e, and d is equal to e.

5. The pole according to any one of claims 1 to 3, characterized in that: The first slot (140) and the second slot (240) are both through slots.

6. The pole according to claim 5, characterized in that: The first embedding portion (130) and the second slot (240) are welded at the seam at the edge, and the second embedding portion (230) and the first slot (140) are welded at the seam at the edge.

7. The pole according to any one of claims 1 to 3, characterized in that: The first engaging portion (130) is parallel to the end surface of the support (110), and the second engaging portion (230) is parallel to the radial direction of the column (210).

8. The pole according to any one of claims 1 to 3, characterized in that: The first protrusion (120) is perpendicular to the end surface of the support (110), and the second protrusion (220) is parallel to the axial direction of the column (210).

9. A battery cover, characterized in that: It comprises a cover plate body (10) and a pole (20) according to any one of claims 1 to 8, wherein the pole (20) is arranged on the cover plate body (10).

10. A single cell, characterized in that: It comprises a battery shell, an electrode group and the battery cover plate as claimed in claim 9, wherein the electrode group is arranged in the battery shell, and the cover plate body (10) is covered at the opening of the battery shell.

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