Terminal post, battery cover plate and single cell

Abstract

The present invention belongs to the technical field of batteries, and discloses a terminal post, a battery cover plate and a single cell battery. The terminal post includes a support and a column body. A first protruding portion is provided on the end face of the support, and a first fitting portion is provided on the first protruding portion. The first fitting portion, the first protruding portion and the support cooperate to form a first slot. A second protruding portion is provided on the end face of the column body facing the support, and a second fitting portion is provided on the second protruding portion. The second fitting portion, the second protruding portion and the column body cooperate to form a second slot. The first fitting portion is embedded in the second slot, and the second fitting portion is embedded in the first slot. The first protruding portion and the second protruding portion are oppositely arranged with respect to the axis of the column body, thereby improving the connection reliability between the support and the column body and reducing the risk of terminal post fracture.

Description

Technical Field

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

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the use performance and safety of lithium-ion batteries are increasing day by day. The terminal post is a component that connects the inside and outside of the lithium-ion battery. One end of the terminal post extends to the outside of the battery case, and the other end is connected to the internal electrode group of the battery case, so as to realize the function of charging and discharging.

[0003] In the prior art, the negative terminal post is usually a copper-aluminum composite terminal post. As shown in Figure 1 the column body 100' of the copper-aluminum composite terminal post is made of aluminum material, and the support 200' is made of copper material. In actual production, the friction welding process is often used to fixedly connect the column body 100' and the support 200' together. During the welding process, with the increase of welding stress and brittleness, cracks are likely to occur at the joint 300' of the column body 100' and the support 200', and there is a risk of terminal post fracture.

[0004] Therefore, there is an urgent need to propose a terminal post, a battery cover plate, and a single cell battery to solve the above technical problems. Summary of the Invention

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

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

[0007] A terminal post, comprising:

[0008] A support, on the end face of the support, there is a first protruding portion, and on the first protruding portion, there is a first fitting portion. The first fitting portion, the first protruding portion, and the support cooperate to form a first slot;

[0009] A column body, on the end face of the column body facing the support, there is a second protruding portion, and on the second protruding portion, there is a second fitting portion. The second fitting portion, the second protruding portion, and the column body cooperate to form a second slot;

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

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

[0012] Optionally, a is equal to b.

[0013] Optionally, the slot width of the first slot is d, the slot 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 joint between the first fitting portion and the edge of the second slot is welded, and the joint between the second fitting portion and the edge of the first slot is welded.

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

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

[0018] The second object of the present invention is to provide a battery cover plate, on which the probability of the pole post breaking is relatively low, and the probability of the pole post falling off from the cover plate body is also reduced.

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

[0020] The battery cover plate includes a cover plate body and the above-mentioned pole post, and the pole post is arranged on the cover plate body.

[0021] The third object of the present invention is to provide a single cell, which has relatively high use safety.

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

[0023] The single cell includes a battery case, a pole group, and the above-mentioned battery cover plate. The pole group is arranged in the battery case, and the cover plate body covers the opening of the battery case.

[0024] The beneficial effects of the present invention:

[0025] For the pole column provided by the present invention, the first fitting portion on the support is fitted into the second slot of the column body, and the second fitting portion of the column body is fitted into the first slot of the support. Thus, the first fitting portion and the second fitting portion form an interlocking structure, eliminating the friction welding process, improving the reliability of the connection between the support and the column body, and reducing the risk of pole column fracture. Moreover, the first protruding portion and the second protruding portion are oppositely arranged with respect to the axis of the column body, and this structural design can improve the interlocking reliability and further enhance the reliability of the connection between the support and the column body. Brief Description of the Drawings

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

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

[0028] Figure 3 is Figure 2 a cross-sectional view taken along the A-A direction in

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

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

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

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

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

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

[0035] In the figure:

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

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

[0038] 10, cover plate body; 20, pole column. Detailed Embodiments

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0040] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0041] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0042] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0043] This embodiment provides a terminal post, which can improve the reliability of the connection between the support and the column body and reduce the risk of terminal post fracture.

[0044] Specifically, as Figures 2 to 8As shown in the figure, the terminal post 20 includes a support 110 and a column body 210. Among them, a first protrusion 120 is provided on the end face of the support 110, a first fitting portion 130 is provided on the first protrusion 120, and the first fitting portion 130, the first protrusion 120 and the support 110 cooperate to form a first slot 140. The end face of the column body 210 facing the support 110 is provided with a second protrusion 220, a second fitting portion 230 is provided on the second protrusion 220, and the second fitting portion 230, the second protrusion 220 and the column body 210 cooperate to form a second slot 240. The first fitting portion 130 is embedded in the second slot 240, the second fitting portion 230 is embedded in the first slot 140, and the first protrusion 120 and the second protrusion 220 are arranged opposite to each other with respect to the axis of the column body 210.

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

[0046] Optionally, as Figures 2 to 8 shown, the first fitting portion 130 is parallel to the end face of the support 110, so that the two inner walls of the first slot 140 opposite to each other are parallel to each other. The second fitting portion 230 is parallel to the radial direction of the column body 210, so that the two inner walls of the second slot 240 opposite to each other are parallel to each other. This structural design can, on the one hand, make the structures of the support 110 and the column body 210 have better consistency, which is beneficial to reducing the production difficulty of the support 110 and the column body 210. On the other hand, it can also ensure the reliability of the first fitting portion 130 being embedded in the second slot 240 and the reliability of the second fitting portion 230 being embedded in the first slot 140, thereby ensuring the reliability of the interlocking between the first fitting portion 130 and the second fitting portion 230.

[0047] Optionally, as Figures 2 to 8 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 body 210. This structural design can make the structures of the support 110 and the column body 210 have better consistency, which is beneficial to reducing the production difficulty of the support 110 and the column body 210.

[0048] Optionally, as Figures 2 to 8As shown, one side of the first fitting portion 130 facing away from the first protruding portion 120 is in contact with the bottom of the second slot 240, expanding the volume of the first fitting portion 130 embedded in the second slot 240, improving the reliability of the first fitting portion 130 embedded in the second slot 240, and further improving the reliability of the interlock between the first fitting portion 130 and the second fitting portion 230.

[0049] Optionally, as Figures 2 to 8 shown, one side of the second fitting portion 230 facing away from the second protruding portion 220 is in contact with the bottom of the first slot 140, expanding the volume of the second fitting portion 230 embedded in the first slot 140, improving the reliability of the second fitting portion 230 embedded in the first slot 140, and further improving the reliability of the interlock between the first fitting portion 130 and the second fitting portion 230.

[0050] Optionally, as Figures 2 to 8 shown, both the first slot 140 and the second slot 240 are through slots, which can expand the volume of the first fitting portion 130 embedded in the second slot 240 and the volume of the second fitting portion 230 embedded in the first slot 140, and further improve the reliability of the interlock between the first fitting portion 130 and the second fitting portion 230.

[0051] In this embodiment, the column 210 is cylindrical, and the side walls of the first protruding portion 120, the first fitting portion 130, the second fitting portion 230, and the second protruding portion 220 are all arc-shaped surfaces, and the arc-shaped surfaces are adapted to the side wall of the column 210. Of course, in other embodiments, the column 210 can also be other shapes such as rectangular. When the column 210 is rectangular, the side walls of the first protruding portion 120, the first fitting portion 130, the second fitting portion 230, and the second protruding portion 220 are all flat surfaces.

[0052] Furthermore, the joint between the first fitting portion 130 and the edge of the second slot 240 is welded, and the joint between the second fitting portion 230 and the edge of the first slot 140 is welded. On the basis of the interlock between the first fitting portion 130 and the second fitting portion 230, the joint between the first fitting portion 130 and the edge of the second slot 240 is welded, and the joint between the second fitting portion 230 and the edge of the first slot 140 is welded, further improving the reliability of the connection between the column 210 and the support 110. And after welding at the joint, the conductive volume of the pole 20 is expanded, having the effect of improving the conductive ability of the pole 20.

[0053] Optionally, as Figures 2 to 8As shown, the slot depth directions of the first slot 140 and the second slot 240 are both the first direction. The dimension of the first protrusion 120 in the first direction is a, the dimension of the second protrusion 220 in the first direction is b, and the dimension of the column 210 in the first direction is c. a is 25% - 40% of c. Exemplarily, 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 relatively low. When the pole 20 is subjected to a large external pushing or pulling force, the first protrusion 120 is prone to breakage. If the ratio of a to c is greater than 40%, the slot depth of the first slot 140 is smaller, resulting in a smaller depth of the second engaging portion 230 embedded in the first slot 140, which reduces the interlocking reliability between the first engaging portion 130 and the second engaging portion 230, and further reduces the anti-pushing and pulling ability of the pole 20. b is 25% - 40% of c. Exemplarily, b is 25%, 30% or 40% of c, etc. 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 slot depth of the second slot 240 is smaller, resulting in a smaller depth of the first engaging portion 130 embedded in the second slot 240, which reduces the interlocking reliability between the first engaging portion 130 and the second engaging portion 230.

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

[0055] Furthermore, a is equal to b, making the structural strengths of the first protrusion 120 and the second protrusion 220 approximately 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 approximately the same, making the overall force on the pole 20 more uniform and reducing the probability of cracks or even fractures occurring at local positions of the pole 20.

[0056] Optionally, as Figures 2 to 8 shown, the slot width of the first slot 140 is d, and the slot width of the second slot 240 is e. d is equal to e, and further makes the thickness g of the first engaging portion 130 equal to the thickness f of the second engaging portion 230, making the structural strengths of the first engaging portion 130 and the second engaging portion 230 approximately the same. When the pole 20 is subjected to an external force, the forces on the first engaging portion 130 and the second engaging portion 230 are approximately the same, making the overall force on the pole 20 more uniform and reducing the probability of cracks or even fractures occurring in the first engaging portion 130 and the second engaging portion 230.

[0057] The terminal post 20 provided in this embodiment is a copper-aluminum composite terminal post. Specifically, the materials of the support 110, the first protrusion 120, and the first fitting portion 130 are all copper, and the materials of the column body 210, the second protrusion 220, and the second fitting portion 230 are all aluminum. Of course, in other implementation schemes, the support 110, the first protrusion 120, the first fitting portion 130, the column body 210, the second protrusion 220, and the second fitting portion 230 can also be made of other materials, and the materials of the support 110, the first protrusion 120, the first fitting portion 130, the column body 210, the second protrusion 220, and the second fitting portion 230 can also be the same, which can be determined according to the adaptation application requirements.

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

[0059] Furthermore, as Figure 9 shown, two terminal posts 20 are arranged on the cover plate body 10. One of the two terminal posts 20 is a positive terminal post, and the other is a negative terminal post. In this embodiment, the negative terminal post is the above-mentioned terminal post 20. Of course, in other implementation schemes, it can also be that the positive terminal post is the above-mentioned terminal post 20, or it can also be that both the positive terminal post and the negative terminal post are the above-mentioned terminal posts 20.

[0060] This embodiment also provides a single cell. The single cell includes a cell case, an electrode assembly, and the above-mentioned battery cover plate. The electrode assembly is arranged in the cell case, and the cover plate body 10 covers the opening of the cell case. The single cell adopts the above-mentioned battery cover plate, and the probability of its terminal post 20 breaking is relatively low, and the probability of the terminal post 20 falling off the cover plate body 10 is relatively low, which has the effect of improving the use safety of the single cell.

[0061] To verify that in this embodiment, when a is 25%-40% of c, the terminal post 20 has a high anti-pull and push ability. As shown in the following table, the maximum pull and push force F that the terminal post 20 can withstand corresponding to different ratios of a to c is selected:

[0062]

[0063]

[0064]

[0065] In Comparative Examples 1 to 9, the value of c was 8 mm, and different values of a were selected to obtain different ratios of a to c. Among them, when the ratio of a to c was 16%, 21%, 44%, and 46%, the maximum pushing and pulling force F that the terminal post 20 could withstand was less than 1000 N. When the ratio of a to c was 25%, 30%, 35%, 39%, and 40%, the maximum pushing and pulling force F that the terminal post 20 could withstand was greater than 1000 N.

[0066] In Comparative Examples 10 to 18, the value of c was 10 mm, and different values of a were selected to obtain different ratios of a to c. Among them, when the ratio of a to c was 20%, 22%, 42%, and 46%, the maximum pushing and pulling force F that the terminal post 20 could withstand was less than 1000 N. When the ratio of a to c was 25%, 28%, 32%, 36%, and 40%, the maximum pushing and pulling force F that the terminal post 20 could withstand was greater than 1000 N.

[0067] In Comparative Examples 19 to 27, the value of c was 8.5 mm, and different values of a were selected to obtain different ratios of a to c. Among them, when the ratio of a to c was 20%, 24%, 44%, and 47%, the maximum pushing and pulling force F that the terminal post 20 could withstand was less than 1000 N. When the ratio of a to c was 25%, 29%, 33%, 36%, and 40%, the maximum pushing and pulling force F that the terminal post 20 could withstand was greater than 1000 N.

[0068] It can be seen that when the ratio of a to c is 25% - 40%, the maximum pushing and pulling force F that the terminal post 20 can withstand is ≥ 1000 N, that is, the terminal post 20 has a high anti-pushing and pulling ability.

[0069] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall 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), and the second embedding portion (230) is embedded in the first slot (140), so that the first embedding portion (130) and the second embedding portion (230) form an interlocking structure, and the first protruding portion (120) and the second protruding portion (220) are arranged relative to each other with respect to the axis of the column (210); 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, 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; 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.

2. The pole according to claim 1, characterized in that: a and b are equal.

3. The pole according to claim 1, 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.

4. The pole according to claim 1, characterized in that: The first slot (140) and the second slot (240) are both through slots.

5. The pole according to claim 1, 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).

6. The pole according to claim 1, 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).

7. 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 6, wherein the pole (20) is arranged on the cover plate body (10).

8. A single cell, characterized in that: It comprises a battery shell, an electrode group and the battery cover plate as claimed in claim 7, 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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