Battery electrode connecting assembly, single battery and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery electrode connecting assembly, a single battery and electric equipment. The battery electrode connecting assembly comprises a battery shell, a pole, an outer insulating part and a high-temperature-resistant insulating part, wherein a through hole is formed in the battery shell; the pole comprises a middle connecting part and an outer connecting part which are sequentially arranged along the axial direction of the pole; the middle connecting part is partially inserted into the through hole in an insulating and sealing manner; at least part of the outer connecting part protrudes out of the through hole in the radial direction. The outer insulating part is arranged on the periphery of the middle connecting part in a sleeving manner, and at least part of the outer insulating part is clamped between the outer connecting part and the battery shell; any one of the outer connecting part and the outer insulating part is provided with a mounting groove; the high-temperature-resistant insulating part is partially arranged in the mounting groove and can be abutted by the outer insulating part and the outer connecting part, so that the secondary short circuit protection between the pole and the battery shell can be realized, the safety and the reliability are improved, the structure is simple, and the cost is low.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery electrode connection assembly, a single battery cell, and an electrical device. Background Technology

[0002] With the continuous development of batteries, safety has always been one of the most important performance characteristics. Currently, a battery consists of a battery casing, a cell pack assembly, and terminal assemblies. The battery casing houses the cell pack assembly and terminal assemblies, while the terminal assemblies connect to electronic components, sensors, or connectors to enable the external discharge function of the cylindrical battery. Furthermore, the external connection of the terminal assembly is often insulated from the battery casing using external insulating components to prevent short circuits and other safety hazards in the cylindrical battery.

[0003] As cylindrical batteries are developing towards higher energy density and higher charge / discharge power, the short-term current intensity of the terminal components is high, and the usage frequency is high. Therefore, the terminal components generate a lot of heat. Since the current external insulation components are not strong in high temperature resistance, they may melt under high temperature (above 300°C), resulting in poor insulation or even short circuits. This makes the cylindrical battery susceptible to insulation failure due to the high temperature caused by high voltage current during fast charging and long-term vehicle operation.

[0004] Therefore, there is an urgent need to provide a battery electrode connection assembly, a single battery cell, and an electrical device to solve the above-mentioned technical problems. Utility Model Content

[0005] One objective of this invention is to provide a battery electrode connection assembly that can protect against secondary short circuits between the electrode post and the battery casing, thereby improving safety and reliability. It also features a simple structure and low cost.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The battery electrode connection assembly includes:

[0008] The battery casing has through holes;

[0009] The pole includes a middle connecting part and an outer connecting part arranged sequentially along its own axial direction. The middle connecting part is partially insulated and sealed and inserted into the through hole. At least a portion of the outer connecting part protrudes from the through hole along its own radial direction.

[0010] An outer insulating member is sleeved on the outer periphery of the central connecting portion, and at least a portion of the outer insulating member is sandwiched between the outer connecting portion and the battery casing; either the outer connecting portion or the outer insulating member is provided with a mounting groove.

[0011] A high-temperature resistant insulating component is partially disposed within the aforementioned mounting groove and can be abutted by the aforementioned external insulating component and the aforementioned external connecting portion.

[0012] Optionally, the thickness of the high-temperature resistant insulating component is greater than the depth of the mounting groove, so that the high-temperature resistant insulating component at least partially extends out of the mounting groove.

[0013] Optionally, the thickness of the high-temperature resistant insulating component is T, and the depth of the mounting groove is D, where TD > 0.1 mm.

[0014] Optionally, the high-temperature resistant insulating component has a higher high-temperature resistance than the external insulating component, and the high-temperature resistant insulating component has a higher thermal insulation performance than the external insulating component.

[0015] Optionally, the material of the above-mentioned high-temperature resistant insulation component is any one of fiber strips, porous ceramic profiles, foam plastics, and porous glass.

[0016] Optionally, it further includes a sealing element, which is sleeved on the outer periphery of the intermediate connecting portion and connected to the outer insulating element to achieve a seal between the intermediate connecting portion and the wall of the through hole; and / or,

[0017] It also includes an inner insulating component. The terminal post includes an inner connecting portion, which is connected to the side of the middle connecting portion near the inside of the battery. The inner insulating component is sleeved on the outer periphery of the middle connecting portion and is at least partially sandwiched between the inner connecting portion and the outer connecting portion.

[0018] Optionally, the high-temperature resistant insulating component is further provided with a limiting boss on the side away from the bottom of the mounting groove, and the cross-sectional area of ​​the limiting boss is larger than the cross-sectional area of ​​the mounting groove.

[0019] Optionally, the battery casing includes a battery housing and a battery top cover, and the through hole is formed in the battery housing or the battery top cover.

[0020] Another objective of this invention is to provide a single-cell battery, which includes the battery electrode connection assembly described in any of the above embodiments.

[0021] Another objective of this invention is to provide an electrical device comprising a single battery as described above.

[0022] The beneficial effects of this utility model are:

[0023] This invention provides a battery electrode connection assembly, a single battery cell, and an electrical device. By creating an installation groove between the external connection part and the external insulation component, and installing a high-temperature resistant insulation component within the groove, the invention addresses the issue of thermal runaway in the single battery cell or a short-term increase in charging / discharging current, which could cause the electrode post to heat up and potentially melt the external insulation component in contact with it at a certain temperature. In this case, the high-temperature resistant insulation component, acting as a secondary insulation protection structure, provides an insulating gap between the external insulation component and the battery casing, preventing secondary short circuits and improving the safety of the battery electrode connection assembly. Furthermore, the installation groove not only positions the high-temperature resistant insulation component but also eliminates the need for it to fill the side of the external connection part facing the external insulation component, reducing the structural volume and material usage, simplifying the structure, lowering the cost, and improving the volume utilization rate of the high-temperature resistant insulation component. Attached Figure Description

[0024] Figure 1 This is an isometric view of a single battery provided in a specific embodiment of this utility model;

[0025] Figure 2 This is a cross-sectional view of a single battery provided in a specific embodiment of this utility model;

[0026] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle.

[0027] In the picture:

[0028] 10. Battery casing; 101. Through hole;

[0029] 20. Pole post; 201. Mounting slot; 21. Middle connection part; 22. External connection part; 23. Internal connection part;

[0030] 30. External insulation components; 40. High-temperature resistant insulation components;

[0031] 50. Sealing components; 60. Internal insulation components. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0033] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this embodiment, the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0036] The following reference Figures 1 to 3 This invention introduces the battery electrode connection assembly, single battery cell, and electrical equipment provided by this utility model.

[0037] This embodiment provides a battery electrode connection assembly for achieving secondary insulation between the battery casing 10 and the terminal post 20, so as to prevent the terminal post 20 from undergoing a secondary short circuit under high temperature conditions.

[0038] Please refer to Figures 1 to 3Specifically, the battery electrode connection assembly includes a battery casing 10, a terminal post 20, an outer insulating member 30, and a high-temperature resistant insulating member 40. The battery casing 10 has a through hole 101. The terminal post 20 includes a central connecting portion 21 and an outer connecting portion 22 arranged sequentially along its own axial direction. The central connecting portion 21 is partially insulated and sealed into the through hole 101. At least a portion of the outer connecting portion 22 protrudes radially from the through hole 101. The outer insulating member 30 is sleeved on the outer periphery of the central connecting portion 21, and at least a portion of the outer insulating member 30 is sandwiched between the outer connecting portion 22 and the battery casing 10. Either the outer connecting portion 22 or the outer insulating member 30 has a mounting groove 201. A portion of the high-temperature resistant insulating member 40 is disposed in the mounting groove 201 and can be abutted by the outer insulating member 30 and the outer connecting portion 22.

[0039] In this embodiment, the battery electrode connection assembly utilizes a mounting groove 201 between the outer connection portion 22 and the outer insulating member 30. A high-temperature resistant insulating member 40 is installed within this groove. If a single cell experiences thermal runaway or a short-term increase in charging / discharging current, the heat generated by the terminal post 20 may rise, potentially causing the outer insulating member 30, which contacts the terminal post 20, to melt at a certain temperature. In this case, the high-temperature resistant insulating member 40, acting as a secondary insulation protection structure, can insulate the outer insulating member 30 of the terminal post 20 from the battery casing 10, preventing secondary short circuits and improving the safety of the battery electrode connection assembly. Furthermore, since the high-temperature resistant insulating member 40 insulates the outer connection portion 22 of the terminal post 20 from the battery casing 10, it also provides some support to the terminal post 20. This allows other parts of the terminal post 20 to also be spaced apart from the battery casing 10, achieving insulation protection against secondary short circuits between the terminal post 20 and the battery casing 10, further enhancing the safety and reliability of the battery electrode connection assembly. Meanwhile, the installation groove 201 not only positions the high-temperature resistant insulation component 40 for installation, but also eliminates the need for the high-temperature resistant insulation component 40 to fill the side of the outer connection part 22 facing the outer insulation component 30, reducing the volume of the structure and the amount of material used, simplifying the structure of the high-temperature resistant insulation component 40, reducing the cost of the high-temperature resistant insulation component 40, and improving the volume utilization rate of the high-temperature resistant insulation component 40.

[0040] Optionally, the high-temperature resistant insulating component 40 is a ring structure, and the corresponding mounting groove 201 is also a ring groove, which can better achieve high-temperature resistant secondary insulation between the external connection part 22 and the battery casing 10.

[0041] Since the pole post 20 is made of metal and the outer insulation component 30 is made of plastic, specifically in this embodiment, the mounting groove 201 is formed on the outer connecting part 22, which can improve the installation and fixing effect of the mounting groove 201 on the high-temperature resistant insulation component 40. The mounting groove 201 will not undergo large deformation, and the installation effect is better.

[0042] Specifically, the thickness of the high-temperature resistant insulating component 40 is greater than the depth of the mounting groove 201, so that the high-temperature resistant insulating component 40 at least partially extends out of the mounting groove 201. This arrangement ensures that the high-temperature resistant insulating component 40 is at least partially located in the gap between the outer insulating component 30 and the outer connecting part 22. As a result, even after the outer insulating component 30 melts, at least a portion of the high-temperature resistant insulating component 40 remains between the outer connecting part 22 and the battery casing 10, thus avoiding direct contact between the two and preventing secondary short circuits, thereby improving safety in use.

[0043] Optionally, the thickness of the high-temperature resistant insulating component 40 is T, and the groove depth of the mounting groove 201 is D. TD > 0.1mm, which can meet the insulation distance between the pole post 20 and the battery casing 10 and prevent them from contacting each other.

[0044] Alternatively, a limiting boss is provided on the side of the high-temperature resistant insulating component 40 away from the bottom of the mounting groove 201. The cross-sectional area of ​​the limiting boss is larger than the cross-sectional area of ​​the mounting groove 201. That is, the outer diameter of the part of the high-temperature resistant insulating component 40 protruding from the mounting groove 201 can be increased to achieve overlapping and limiting with the end face of the mounting groove 201, thereby facilitating installation by operators and ensuring that at least a portion of the high-temperature resistant insulating component 40 is sandwiched between the outer insulating component 30 and the outer connecting part 22.

[0045] Specifically, the high-temperature resistant insulating component 40 has better high-temperature resistance than the outer insulating component 30, and its heat insulation performance is also better than that of the outer insulating component 30. This means that even when the outer insulating component 30 melts at high temperatures, the high-temperature resistant insulating component 40 can maintain its structural integrity, ensuring that the outer connecting part 22 and the battery casing 10 are separated and insulated, further improving safety and reliability. It also ensures that the high-temperature fumes or liquids generated during thermal runaway of a single battery cell during high-power charging and discharging will not affect the high-temperature resistant insulating component 40.

[0046] Specifically, the high-temperature resistant insulating component 40 can be made of any one of the following materials: organic PTC thermistor, ceramic, mica fiber strip, porous ceramic profile, foam plastic and porous glass, all of which can achieve its high-temperature resistance, heat insulation and insulation performance.

[0047] More specifically, the high-temperature resistant insulation component 40 is made of fiber cotton strips or porous ceramic profiles and is manufactured using a proprietary formula with full-gradient compounding technology, combined with existing aerogel in-situ generation technology, thereby achieving higher high-temperature resistance, insulation and sealing performance, and lower cost.

[0048] Furthermore, the battery electrode connection assembly also includes a sealing member 50, which is sleeved on the outer periphery of the middle connection portion 21 and connected to the outer insulating member 30 to achieve a seal between the middle connection portion 21 and the hole wall of the through hole 101; and / or, the battery electrode connection assembly also includes an inner insulating member 60, the electrode post 20 includes an inner connection portion 23, the inner connection portion 23 is connected to the side of the middle connection portion 21 near the inside of the battery, the inner insulating member 60 is sleeved on the outer periphery of the middle connection portion 21 and at least partially sandwiched between the inner connection portion 23 and the outer connection portion 22, thereby achieving insulation between the inner connection portion 23 of the electrode post 20 and the battery casing 10.

[0049] Specifically, the battery electrode connection assembly in this embodiment includes a sealing member 50 and an inner insulating member 60. The inner insulating member 60 is sleeved on the outer periphery of the sealing member 50, and the sealing member 50 can be clamped by the inner insulating member 60 and the middle connecting part 21 of the electrode post 20. By sequentially arranging the outer insulating member 30, the sealing member 50 and the inner insulating member 60, a primary insulating protective layer can be formed to achieve insulation between the electrode post 20 and the battery casing 10.

[0050] Optionally, the outer insulating component 30, the sealing component 50, and the inner insulating component 60 are all annular structures to facilitate the installation of the pole post 20. Furthermore, both the outer insulating component 30 and the inner insulating component 60 are made of plastic material to achieve insulation against the pole post 20. The sealing component 50 is made of any one of the following rubber materials: nitrile rubber, fluororubber, silicone rubber, etc., or any one of the following plastic materials: polytetrafluoroethylene, polyurethane, etc., to achieve its sealing and insulation effect. Of course, it can also be made of other sealing materials, which are not specifically limited here.

[0051] Furthermore, the battery casing 10 includes a battery housing and a battery top cover. The through hole 101 is formed in either the battery housing or the battery top cover, both of which can be used to install and fix the terminal post 20. It is understood that whether it is fixed in the battery housing or the battery top cover can be adapted according to actual needs, and no specific limitation is made here.

[0052] Furthermore, the terminal post 20 and the battery casing 10 can be fixed together by means of self-riveting the terminal post 20 to the battery casing 10, riveting the terminal post 20 to the battery casing 10 by a riveting block, bonding the terminal post 20 to the battery casing 10 with adhesive, or pressing the terminal post 20 to the battery casing 10 by a riveting flange on the battery casing 10. No specific limitation is made here. For example, in this embodiment, the terminal post 20 and the battery casing 10 are fixedly connected by riveting, so that the terminal post 20 includes a middle connecting part 21, an outer connecting part 22, and an inner connecting part 23.

[0053] Please refer to Figure 1 and Figure 2This embodiment also provides a single-cell battery, which includes the battery electrode connection assembly described in any of the above-described solutions. Specifically, the single-cell battery can be a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid (or lead-acid) battery, a lithium-ion battery, a polymer lithium-ion battery, etc. The single-cell battery can also be a primary lithium-ion battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., which will not be elaborated further here. Furthermore, the single-cell battery can be a cylindrical battery, a prismatic battery, a blade battery, etc., without specific limitations. This single-cell battery has the beneficial effects of the battery electrode connection assembly described in any of the above-described solutions, which will not be elaborated further here.

[0054] When the above-mentioned battery electrode connection assembly is used in the single cell, the sealing and insulation performance of the connection between the outer insulation component 30 and the outer connection part 22 can be improved. Even if the outer insulation component 30, the sealing component 50 or the inner insulation component 60 fails or deforms under high temperature environment, the high temperature resistant insulation component 40 can still ensure the insulation and sealing performance of the connection, thereby improving the safety and reliability of the single cell.

[0055] This embodiment also provides an electrical device, which includes a single battery as described in the above scheme. Specifically, this electrical device can be an electric bicycle, an electric vehicle, a hybrid vehicle, a ship, an energy storage device, etc., as long as it uses electrical energy as its energy source; further details are omitted here.

[0056] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery electrode connection assembly, characterized in that, include: The battery casing (10) has a through hole (101); The pole post (20) includes a middle connecting part (21) and an outer connecting part (22) arranged sequentially along its own axial direction. The middle connecting part (21) is partially insulated and sealed into the through hole (101). At least a portion of the outer connecting part (22) protrudes from the through hole (101) along its own radial direction. An outer insulating member (30) is sleeved on the outer periphery of the middle connecting part (21), and at least a portion of the outer insulating member (30) is sandwiched between the outer connecting part (22) and the battery casing (10); either the outer connecting part (22) or the outer insulating member (30) is provided with a mounting groove (201); The high-temperature resistant insulating component (40) is partially disposed in the mounting groove (201) and can be abutted by the outer insulating component (30) and the outer connecting part (22).

2. The battery electrode connection assembly according to claim 1, characterized in that, The thickness of the high-temperature resistant insulating component (40) is greater than the depth of the mounting groove (201) so that the high-temperature resistant insulating component (40) extends at least partially out of the mounting groove (201).

3. The battery electrode connection assembly according to claim 2, characterized in that, The thickness of the high-temperature resistant insulating component (40) is T, and the groove depth of the mounting groove (201) is D, where TD > 0.1 mm.

4. The battery electrode connection assembly according to claim 1, characterized in that, The high-temperature resistant insulating component (40) has a higher high-temperature resistant performance than the outer insulating component (30), and the heat insulation performance of the high-temperature resistant insulating component (40) is higher than that of the outer insulating component (30).

5. The battery electrode connection assembly according to claim 4, characterized in that, The high-temperature resistant insulating component (40) is made of any one of fiber cotton strips, porous ceramic profiles, foam plastics, and porous glass.

6. The battery electrode connection assembly according to claim 1, characterized in that, It also includes a sealing element (50), which is fitted around the outer periphery of the intermediate connecting portion (21) and connected to the outer insulating element (30) to achieve a seal between the intermediate connecting portion (21) and the wall of the through hole (101); and / or, It also includes an inner insulating member (60), the pole post (20) includes an inner connecting part (23), the inner connecting part (23) is connected to the side of the middle connecting part (21) near the inside of the battery, the inner insulating member (60) is sleeved on the outer periphery of the middle connecting part (21) and at least partially sandwiched between the inner connecting part (23) and the outer connecting part (22).

7. The battery electrode connection assembly according to any one of claims 1-6, characterized in that, The high-temperature resistant insulating component (40) is provided with a limiting boss on the side away from the bottom of the mounting groove (201), and the cross-sectional area of ​​the limiting boss is larger than the cross-sectional area of ​​the mounting groove (201).

8. The battery electrode connection assembly according to any one of claims 1-6, characterized in that, The battery casing (10) includes a battery housing and a battery top cover, and the through hole (101) is formed in the battery housing or the battery top cover.

9. A single-cell battery, characterized in that, Includes the battery electrode connection assembly as described in any one of claims 1-8.

10. Electrical equipment, characterized in that, Includes the single-cell battery as described in claim 9.

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