Pole assembly, battery monomer and battery module

Abstract

The utility model discloses a pole assembly, a single battery and a battery module. The pole assembly is used for the single battery and comprises a pole, an upper insulating part and a welding ring, the pole penetrates through the top cover of the battery monomer; the upper insulating part is arranged around the pole, and a groove is formed in the lower end surface of the upper insulating part; the welding ring is arranged around the pole and abuts against the lower end face of the upper insulating part, a protrusion is arranged on the upper surface of the welding ring and matched with the groove, a welding face is arranged on the radial outer end face of the welding ring, and after the pole is connected with the welding ring and the upper insulating part in a riveted mode, the welding face is connected with the top cover in a welded mode. According to the pole assembly disclosed by the utility model, the pole assembly is welded with the top cover after being formed into a whole, so that the structural strength and the reliability of the whole of the pole assembly and the top cover are enhanced, and the safety and the manufacturability of the battery monomer are improved.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of batteries, and particularly relates to a pole column assembly, a battery cell and a battery module. Background Art

[0002] In the prior art, the structure of a battery cell is composed of pole column riveting or injection molding. During the manufacturing process of the top cover plate assembly, multiple components need to go through numerous processes to form, resulting in complex manufacturing processes, high manufacturing costs, and large occupation of the internal space of the battery. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a pole column assembly, which is welded to the top cover after forming an integral body, enhancing the overall structural strength and reliability of the pole column assembly and the top cover, and improving the safety and manufacturability of the battery cell.

[0004] The utility model also provides a battery cell, which includes the above-mentioned pole column assembly.

[0005] The utility model also provides a battery module, which includes the above-mentioned battery cell.

[0006] The pole column assembly according to an embodiment of the utility model is used for a battery cell and includes a pole column, an upper insulating part and a welding ring. The pole column passes through the top cover of the battery cell; the upper insulating part is arranged around the pole column, and a groove is provided on the lower end surface of the upper insulating part; the welding ring is arranged around the pole column, the welding ring abuts against the lower end surface of the upper insulating part, a protrusion is provided on the upper surface of the welding ring, the protrusion cooperates with the groove, a welding surface is provided on the radially outer end surface of the welding ring, and after the pole column is riveted and connected to the welding ring and the upper insulating part, the welding surface is welded and connected to the top cover.

[0007] The pole column assembly according to an embodiment of the utility model, by matching the protrusion of the welding ring with the groove of the upper insulating part, and after the pole column is riveted and connected to the welding ring and the upper insulating part, the welding surface is welded and connected to the top cover. The pole column assembly forms an integral body and then is welded to the top cover, enhancing the overall structural strength and reliability of the pole column assembly and the top cover, and improving the safety and manufacturability of the battery cell.

[0008] In some embodiments of the utility model, a riveting rib is provided at the lower end of the pole column, and the riveting rib is arranged on the lower sides of the pole column and the upper insulating part.

[0009] In some embodiments of the utility model, the pole column assembly further includes a sealing ring, the sealing ring is arranged around the pole column, and the sealing ring is arranged between the welding ring and the riveting rib.

[0010] A battery cell according to an embodiment of the present invention includes the above-mentioned shell body, top cover, electrode group, and the above-mentioned pole column assembly. The top cover and the shell body jointly define an installation space; the pole column assembly passes through the top cover; the electrode group is arranged in the installation space.

[0011] For the battery cell according to an embodiment of the present invention, by matching the protrusion of the welding ring with the groove of the upper insulating part, after the pole column is riveted and connected to the welding ring and the upper insulating part, the welding surface is welded and connected to the top cover. After the pole column assembly forms an integral body, it is then welded to the top cover, enhancing the overall structural strength and reliability of the pole column assembly and the top cover, and improving the safety and manufacturability of the battery cell.

[0012] In some embodiments of the present invention, a connecting piece is provided on one side of the electrode group close to the pole column assembly, and the connecting piece is electrically connected to both the pole column and the electrode group.

[0013] In some embodiments of the present invention, the lower end surface of the pole column is welded and connected to the connecting piece.

[0014] In some embodiments of the present invention, the battery cell further includes a connecting row, and the connecting row is electrically connected to the pole column.

[0015] In some embodiments of the present invention, the upper end surface of the pole column is welded and connected to the connecting row.

[0016] In some embodiments of the present invention, the battery cell further includes an explosion-proof valve and a liquid injection hole. The explosion-proof valve is arranged on the top cover; the liquid injection hole is arranged on the top cover.

[0017] A battery module according to an embodiment of the present invention includes the above-mentioned battery cell.

[0018] For the battery module according to an embodiment of the present invention, by matching the protrusion of the welding ring with the groove of the upper insulating part, after the pole column is riveted and connected to the welding ring and the upper insulating part, the welding surface is welded and connected to the top cover. After the pole column assembly forms an integral body, it is then welded to the top cover, enhancing the overall structural strength and reliability of the pole column assembly and the top cover, and improving the safety and manufacturability of the battery cell.

[0019] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present invention. Description of the Drawings

[0020] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0021] Figure 1 is a cross-sectional view of a terminal post assembly according to an embodiment of the present utility model;

[0022] Figure 2 is a perspective view of a terminal post assembly according to an embodiment of the present utility model;

[0023] Figure 3 is an exploded view of a terminal post assembly according to an embodiment of the present utility model;

[0024] Figure 4 is an exploded view of the terminal post assembly from another angle according to an embodiment of the present utility model;

[0025] Figure 5 is a cross-sectional view of a battery cell according to an embodiment of the present utility model;

[0026] Figure 6 is a perspective view of a battery cell according to an embodiment of the present utility model.

[0027] Reference numerals:

[0028] 100, battery cell;

[0029] 10, terminal post assembly;

[0030] 1, terminal post; 11, riveting rib;

[0031] 2, upper insulating part; 21, groove;

[0032] 3, welding ring; 31, protrusion; 32, welding surface;

[0033] 4, sealing ring;

[0034] 20, top cover; 30, shell body; 40, explosion-proof valve; 50, liquid injection hole. Detailed implementation manners

[0035] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present utility model and should not be construed as limiting the present utility model.

[0036] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, 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. Therefore, it should not be construed as a limitation to the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0037] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; 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. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0038] Next, reference is made to Figures 1 - 4 Describe the pole assembly 10 according to an embodiment of the present utility model.

[0039] As Figure 1 shown, the pole assembly 10 according to an embodiment of the present utility model includes a pole 1, an upper insulating member 2 and a welding ring 3.

[0040] Specifically, the pole assembly 10 is used for a battery cell 100. The pole assembly 10 is responsible for connecting to an external conductor or an adjacent battery cell 100 in a battery module to achieve current transmission and chemical reactions. The pole assembly 10 is one of the core components of the battery cell 100, and its quality and performance directly affect the overall performance and service life of the battery cell 100.

[0041] As Figure 1 and Figure 2As shown, the terminal post 1 passes through the top cover 20 of the battery cell 100. The upper insulating member 2 is disposed around the terminal post 1. The upper insulating member 2 can protect components such as chemical substances and electrodes inside the battery cell 100, preventing the chemical substances and electrodes and other components from contacting the external environment, thereby avoiding leakage of chemical substances and damage to the electrodes, and helping to ensure the safety and stability of the battery. The upper insulating member 2 can also play a role in flame retardancy and heat insulation, preventing dangerous situations such as spontaneous combustion or explosion of the battery cell 100 in a high-temperature environment.

[0042] As Figure 3 and Figure 4 shown, a groove 21 is provided on the lower end surface of the upper insulating member 2. The welding ring 3 is disposed around the terminal post 1. The welding ring 3 abuts against the lower end surface of the upper insulating member 2. A protrusion 31 is provided on the upper surface of the welding ring 3. The protrusion 31 cooperates with the groove 21. The groove 21 of the upper insulating member 2 can preferably limit the protrusion 31 of the welding ring 3, and the assembly effect of the welding ring 3 and the upper insulating member 2 is better.

[0043] As Figure 3 and Figure 4 shown, a welding surface 32 is provided on the radially outer end surface of the welding ring 3. After the terminal post 1 is riveted and connected to the welding ring 3 and the upper insulating member 2, the welding surface 32 is welded to the top cover 20. The welding ring 3 can limit the welding position of the terminal post assembly 10 and the top cover 20 to the welding surface 32, and can limit the welding position and speed, making the weld seam more uniform and beautiful, enhancing the overall structural strength and reliability of the terminal post assembly 10 and the top cover 20, and improving the safety and manufacturability of the battery cell 100.

[0044] For the terminal post assembly 10 according to the embodiment of the present invention, by matching the protrusion 31 of the welding ring 3 with the groove 21 of the upper insulating member 2, after the terminal post 1 is riveted and connected to the welding ring 3 and the upper insulating member 2, the welding surface 32 is welded to the top cover 20. After the terminal post assembly 10 forms an integral body, it is then welded to the top cover 20, enhancing the overall structural strength and reliability of the terminal post assembly 10 and the top cover 20, and improving the safety and manufacturability of the battery cell 100.

[0045] In this embodiment, the terminal post 1 includes a positive terminal post and a negative terminal post. The positive terminal post and the negative terminal post pass through the left and right of the top cover 20 of the battery cell 100 (such as Figure 5At both ends in the left - right direction (as shown), the positive terminal post is the positive extreme of the battery cell 100, and the negative terminal post is the negative extreme of the battery cell 100. The positive terminal post is connected to the positive active material inside the battery. During discharge, the positive terminal post releases electrons and transfers electrical energy to the electrical device through an external circuit. During charging, the positive terminal post receives electrons from an external power source, causing a charging reaction inside the battery cell 100. The negative terminal post is connected to the negative active material inside the battery cell 100. During discharge, the negative terminal post receives electrons and forms an electric current with the electrons released by the positive terminal post for use by the external circuit. During charging, the negative terminal post releases electrons, causing a charging reaction inside the battery cell 100.

[0046] In some embodiments of the present invention, as Figure 1 and Figure 3 shown, a riveting rib 11 is provided at the lower end of the terminal post 1, and the riveting rib 11 is provided on the lower sides of the terminal post 1 and the upper insulating member 2. During the assembly process of the terminal post assembly 10, the riveting tooling contacts the riveting rib 11 below the terminal post 1, and the riveting rib 11 undergoes a 90° deformation to achieve the cooperation of the terminal post 1, the welding ring 3, and the upper insulating member 2. The cooperation of the terminal post 1, the welding ring 3, and the upper insulating member 2 is relatively simple and reliable.

[0047] In some embodiments of the present invention, as Figure 1 and Figure 3 shown, the terminal post assembly 10 further includes a sealing ring 4. The sealing ring 4 is disposed around the terminal post 1. The sealing ring 4 is an isolation layer between the inside and the outside environment of the battery cell 100. The sealing ring 4 can effectively prevent the leakage of the electrolyte inside the battery cell 100, and at the same time can also prevent the battery cell 100 from being invaded by external moisture, dust, etc. And when the battery cell 100 encounters external vibration during use, the sealing ring 4 can absorb part of the vibration energy, reduce the damage of the vibration to the battery, and ensure the normal operation of the battery cell 100. The sealing ring 4 is disposed between the welding ring 3 and the riveting rib 11. After the riveting rib 11 is riveted, it can limit the sealing ring 4, making the position of the sealing ring 4 relatively stable and reliable.

[0048] The battery cell 100 according to the embodiment of the present invention, as Figure 5 and Figure 6 shown, includes a shell body 30, a top cover 20, a pole group, and a terminal post assembly 10. The top cover 20 and the shell body 30 jointly define an installation space. The pole group is disposed in the installation space. The top cover 20 and the shell body 30 can protect the pole group from being damaged by external force impact, and at the same time can also prevent the pole group from being invaded by external moisture, dust, etc. The terminal post assembly 10 penetrates through the top cover 20.

[0049] According to the battery cell 100 of the embodiment of the present utility model, by matching the protrusion 31 of the welding ring 3 with the groove 21 of the upper insulating member 2, after the pole column 1 is riveted and connected to the welding ring 3 and the upper insulating member 2, the welding surface 32 is welded and connected to the top cover 20. After the pole column assembly 10 forms an integral body, it is then welded to the top cover 20, enhancing the overall structural strength and reliability of the pole column assembly 10 and the top cover 20, and improving the safety and manufacturability of the battery cell 100.

[0050] In some embodiments of the present utility model, a connecting piece is provided on one side of the electrode group close to the pole column assembly 10. The connecting piece is electrically connected to both the pole column 1 and the electrode group. The connecting piece can transfer the current in the electrode group to the pole column 1 and be transferred to an external electrical device or other battery cells 100 through the pole column 1; or when the battery cell 100 is charged, the external current enters the electrode group through the connecting piece to realize the normal operation of the battery cell 100.

[0051] In some embodiments of the present utility model, the lower end surface of the pole column 1 is welded and connected to the connecting piece. The strength of the welded connection is relatively high, and the connection between the connecting piece and the pole column 1 can withstand a large load, ensuring that the battery cell 100 will not have problems due to connection failure during use. The welded connection has good sealing performance, ensuring that the electrolyte will not leak, and at the same time preventing external moisture, dust, etc. from invading the internal structure of the battery cell 100. In addition, the reliability of the welded connection is relatively high, reducing the risk of loosening and falling off of the connecting piece and the pole column 1. The battery cell 100 can maintain a stable connection state for a long time, enabling the battery cell 100 to provide continuous and stable current transmission to ensure the normal operation of the battery cell 100.

[0052] In some embodiments of the present utility model, the battery cell 100 further includes a connection row, and the connection row is electrically connected to the pole column 1. The connection row can increase the electrical connection effect with other battery cells 100 or electrical devices and increase the connection effect between the battery cell 100 and other components.

[0053] In some embodiments of the present utility model, the upper end surface of the pole column 1 is welded and connected to the connection row. The strength of the welded connection is relatively high, and the connection between the connection row and the pole column 1 can withstand a large load, ensuring that the battery cell 100 will not have problems due to connection failure during use. The welded connection has good sealing performance, ensuring that the electrolyte will not leak, and at the same time preventing external moisture, dust, etc. from invading the internal structure of the battery cell 100. In addition, the reliability of the welded connection is relatively high, reducing the risk of loosening and falling off of the connection row and the pole column 1. The battery cell 100 can maintain a stable connection state for a long time, enabling the battery cell 100 to provide continuous and stable current transmission to ensure the normal operation of the battery cell 100.

[0054] In some embodiments of the present utility model, such as Figure 5 andFigure 6 As shown in the figure, the battery cell 100 further includes an explosion-proof valve 40 and a liquid injection hole 50. The explosion-proof valve 40 is provided on the top cover 20. When the pressure or temperature inside the battery cell 100 is too high, the explosion-proof valve 40 will automatically open, releasing the high-pressure gas or high-temperature gas into the external environment, thereby reducing the pressure or temperature inside the battery cell 100 and effectively preventing the risk of explosion of the battery cell 100, greatly improving the safety of the battery cell 100.

[0055] The liquid injection hole 50 is provided on the top cover 20, which is convenient for injecting electrolyte into the battery cell 100 or replenishing the electrolyte after the battery cell 100 has been used for a long time, ensuring the current conduction effect of the battery cell 100.

[0056] The battery module according to the embodiment of the present invention includes the above-mentioned battery cell 100.

[0057] In the battery module according to the embodiment of the present invention, by matching the protrusion 31 of the welding ring 3 with the groove 21 of the upper insulating member 2, after the pole column 1 is riveted and connected to the welding ring 3 and the upper insulating member 2, the welding surface 32 is welded and connected to the top cover 20. After the pole column assembly 10 forms an integral body, it is then welded to the top cover 20, enhancing the overall structural strength and reliability of the pole column assembly 10 and the top cover 20, and improving the safety and manufacturability of the battery cell 100.

[0058] The other components and operations of the pole column assembly 10, the battery cell 100, and the battery module according to the embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail here.

[0059] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0060] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A pole assembly, characterized in that: For battery cells and comprising: A pole, the pole being disposed through a top cover of the battery cell; An upper insulating member, the upper insulating member is arranged around the pole, and a groove is provided on the lower end surface of the upper insulating member; A welding ring is arranged around the pole, the welding ring abuts against the lower end surface of the upper insulating member, the upper surface of the welding ring is provided with a protrusion, the protrusion cooperates with the groove, the radial outer end surface of the welding ring is provided with a welding surface, after the pole is riveted and connected with the welding ring and the upper insulating member, the welding surface is welded to the top cover.

2. The pole assembly according to claim 1, characterized in that: The lower end of the pole is provided with a rivet rib, and the rivet rib is provided on the lower side of the pole and the upper insulating member.

3. The pole assembly according to claim 2, characterized in that: Also includes: A sealing ring is arranged around the pole and between the welding ring and the riveted rib.

4. A battery cell, characterized in that: include: Shell body; A top cover, the top cover and the shell body together define an installation space ； The pole assembly according to any one of claims 1 to 3, wherein the pole assembly is inserted into the top cover; A pole group is arranged in the installation space.

5. The battery cell according to claim 4, characterized in that: A connecting piece is provided on one side of the pole group close to the pole assembly, and the connecting piece is electrically connected to both the pole and the pole group.

6. The battery cell according to claim 5, characterized in that: The lower end surface of the pole is welded to the connecting piece.

7. The battery cell according to claim 4, characterized in that: Also includes: A connecting bar is electrically connected to the pole.

8. The battery cell according to claim 7, characterized in that: The upper end surface of the pole is welded to the connecting bar.

9. The battery cell according to claim 4, characterized in that: Also includes: An explosion-proof valve, the explosion-proof valve being arranged on the top cover; A liquid injection hole is provided on the top cover.

10. A battery module, characterized in that: The invention comprises a battery cell according to any one of claims 4 to 9.

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