Battery lead-out structure and battery

Abstract

The utility model discloses a battery leading-out structure and a battery, the battery leading-out structure comprises a pole, a confluence plate and a riveting piece, the riveting piece penetrates through the pole and the confluence plate and fixes the pole and the confluence plate in a riveting mode, and a liquid injection hole used for injecting liquid into the battery is formed in the riveting piece. According to the battery lead-out structure disclosed by the utility model, the pole and the confluence plate are connected and fixed in a riveting manner, so that the situation that the resistance between the pole and the confluence plate is relatively large due to poor contact surface matching during welding and fixing is avoided, the problem that the pole piece is damaged due to the fact that the pole piece is easily pressed in the welding process is also avoided, and the yield is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and specifically, to a battery lead-out structure and a battery. Background Art

[0002] The cylindrical battery is a battery with advantages such as high capacity and long cycle life. In the existing cylindrical battery, a current collector plate is provided. One side of the current collector plate is welded to the tab, and the other side of the current collector plate is directly or indirectly welded to the terminal through an additional component, so as to realize the output flowing to the terminal.

[0003] However, in the actual processing process, there will be a situation where the contact surface does not fit well during the penetration welding process between the current collector plate or the component and the terminal. At this time, it is easy to cause a virtual weld between the current collector plate and the terminal, resulting in a large resistance between the current collector plate and the terminal, reducing the service performance and the yield rate of the battery. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems in the related technologies to a certain extent.

[0005] To this end, an embodiment of the utility model provides a battery lead-out structure. The terminal and the current collector plate of the battery lead-out structure are connected and fixed by riveting, avoiding the situation where the contact surface does not fit well during welding fixation, which easily causes a large resistance between the two, and also avoiding the problem that the tab is easily damaged due to being pressed during the welding process, ensuring the yield rate.

[0006] The setting of the liquid injection hole in the riveting part on the one hand meets the use requirement of injecting electrolyte, and on the other hand also avoids the situation of opening holes in other parts of the battery, simplifying the overall structure and processing technology.

[0007] An embodiment of the utility model also provides a battery including the above battery lead-out structure.

[0008] The battery lead-out structure of the embodiment of the utility model includes:

[0009] A terminal and a current collector plate;

[0010] A riveting part, the riveting part passes through the terminal and the current collector plate and rivets and fixes the terminal and the current collector plate, and a liquid injection hole for injecting liquid into the battery is provided in the riveting part.

[0011] In some embodiments, the terminal and the current collector plate are welded together.

[0012] In some embodiments, the terminal is provided with a first hole, the current collector plate is provided with a second hole, the first hole and the second hole are arranged opposite to each other, and the riveting part is riveted to at least part of the hole walls of at least one of the first hole and the second hole.

[0013] In some embodiments, the first hole includes a first hole section and a second hole section. The second hole section is located between the first hole section and the second hole. The diameter of the first hole section gradually decreases in the direction towards the second hole section, and the outer peripheral wall of the riveting member is pressed against the hole wall of the first hole section.

[0014] And / or, the second hole includes a third hole section and a fourth hole section. The third hole section is located between the fourth hole section and the first hole. The diameter of the fourth hole section gradually decreases in the direction towards the third hole section, and the outer peripheral wall of the riveting member is pressed against the hole wall of the fourth hole section.

[0015] In some embodiments, the riveting member has a first end face and a second end face that are oppositely arranged in the axial direction of the riveting member. The first end face is flush with the surface of the pole column, and the second end face is flush with the surface of the bus bar plate.

[0016] In some embodiments, a sealing member is included. The sealing member is fitted in the liquid injection hole, and the sealing member is used to seal the liquid injection hole after the liquid injection is completed.

[0017] In some embodiments, the liquid injection hole includes a fifth hole section and a sixth hole section. The fifth hole section is closer to the side of the pole column than the sixth hole section, and the diameter of the fifth hole section gradually decreases in the direction towards the sixth hole section.

[0018] In some embodiments, a sealing sheet is included. The pole column is provided with a groove, the riveting member is located in the area surrounded by the groove wall of the groove, and the sealing sheet is hermetically assembled in the groove to achieve sealing at the riveting member.

[0019] In some embodiments, the material of the sealing sheet is the same as the material of the pole column.

[0020] And / or, the pole column is a positive pole column.

[0021] The battery according to an embodiment of the present invention includes the battery lead-out structure as described in any one of the above embodiments.

[0022] Advantageous effects: The battery lead-out structure and the battery according to the embodiments of the present invention. The pole column and the bus bar plate of the battery lead-out structure are connected and fixed by riveting, avoiding the situation that the contact surface is not well matched during welding fixation, which easily causes a large resistance between the two, and also avoiding the problem that the pole piece is easily damaged due to being pressed during the welding process, ensuring the yield rate.

[0023] The setting of the liquid injection hole in the riveting part on the one hand meets the use requirement of injecting electrolyte, and on the other hand avoids the situation of opening holes in other parts of the battery, simplifying the overall structure and processing technology. Brief Description of the Drawings

[0024] Figure 1 It is a schematic diagram of the overall structure of the battery lead-out structure according to an embodiment of the present invention.

[0025] Figure 2 is Figure 1 a schematic diagram of the structure of the middle pole column.

[0026] Figure 3 is Figure 1 a schematic diagram of the structure of the middle bus bar plate.

[0027] Figure 4 is Figure 1 a schematic diagram of the structure of the middle riveting part.

[0028] Reference Signs:

[0029] 1 - pole column; 11 - first hole; 111 - first hole section; 112 - second hole section; 12 - groove; 13 - annular groove;

[0030] 2 - bus bar plate; 21 - second hole; 211 - third hole section; 212 - fourth hole section;

[0031] 3 - riveting part;

[0032] 4 - seal; 41 - liquid injection hole; 411 - fifth hole section; 412 - sixth hole section; 42 - first end face; 43 - second end face;

[0033] 5 - sealing sheet;

[0034] 6 - sealing ring;

[0035] 7 - housing. Detailed Embodiments

[0036] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0037] The present invention is made based on the inventor's discovery and recognition of the following facts and problems:

[0038] In the related art, the bus bar and the terminal post need to be connected and fixed by penetration welding. However, in the actual operation process, due to insufficient machining accuracy, the surfaces of the bus bar and the terminal post are prone to flatness problems. Secondly, the bus bar needs to be welded to the tab first and then to the bus bar. When the bus bar is welded to the tab, the tab will be squeezed, and the deformed tab will cause the bus bar to tilt as a whole. As a result, the contact surface between the bus bar and the terminal post will not fit well, which is likely to cause poor welding.

[0039] Secondly, when the terminal post and the bus bar are welded and fixed, the bus bar will squeeze the tab and the electrode plate downward, and the electrode plate is prone to damage under this force, reducing the yield rate of processing and making the processing cost relatively high.

[0040] In addition, since the terminal post and the bus bar are welded and fixed, in the existing technology, the liquid injection hole of the cylindrical battery is usually arranged at the bottom (negative electrode) of the cylindrical battery, which requires an additional liquid injection hole to be processed on the steel shell of the cylindrical battery, increasing the process cost.

[0041] Due to the hard material of the steel shell and the fact that the steel shell is mostly processed by stamping, there are R-angle transitions at some welding positions of the steel shell. It is easy to have problems such as low welding yield and poor reliability at the R-angle transition between the sealing steel sheet used to block the liquid injection hole after electrolyte injection and the steel shell at the bottom of the cylindrical battery.

[0042] In view of the above problems and understandings, the embodiment of the present utility model provides a battery lead-out structure.

[0043] As Figure 1 shown, the battery lead-out structure of the embodiment of the present utility model includes a terminal post 1, a bus bar 2 and a riveting member 3.

[0044] The terminal post 1 can be a positive terminal post, and the material of the terminal post 1 can be aluminum. The bus bar 2 can be arranged below the terminal post 1, and the material of the bus bar 2 can be copper, aluminum, etc. The bottom side of the bus bar 2 can be connected to the tab, and the top side of the bus bar 2 can be attached to the lower surface of the terminal post 1.

[0045] The riveting member 3 passes through the terminal post 1 and the bus bar 2 and rivets and fixes the terminal post 1 and the bus bar 2, and a liquid injection hole 41 for injecting liquid into the battery is provided in the riveting member 3. For example, the riveting member 3 can be a structural member such as a rivet. Through holes for the riveting member 3 to pass through can be provided on both the terminal post 1 and the bus bar 2. During assembly, as shown in 1, the riveting member 3 is passed through the terminal post 1 and the bus bar 2. The top side of the riveting member 3 can be riveted and fixed to the terminal post 1, and the bottom side of the riveting member 3 can be riveted and fixed to the bus bar 2, so as to realize the connection and fixation of the terminal post 1 and the bus bar 2, and also ensure the attachment effect between the terminal post 1 and the bus bar 2, and ensure the current conduction performance between the terminal post 1 and the bus bar 2.

[0046] AsFigure 1 As shown, the riveting member 3 can be a hollow structure, that is, a liquid injection hole 41 penetrating the riveting member 3 along the axial direction of the riveting member 3 is provided inside the riveting member 3. After the riveting member 3 rivets and fixes the pole column 1 and the current collecting plate 2, the electrolyte can be filled into the battery through the liquid injection hole 41. After the electrolyte is filled, the liquid injection hole 41 can be sealed.

[0047] In the battery lead-out structure of the embodiment of the present invention, the pole column 1 and the current collecting plate 2 of the battery lead-out structure are connected and fixed by riveting, which avoids the situation that the resistance between the two is relatively large due to poor contact surface matching during welding fixation. Since the connection and fixation are not carried out by welding, the problem that the pole piece is easily damaged due to being pressed during the welding process is also avoided, ensuring the good product rate of processing.

[0048] Since the liquid injection hole 41 is directly provided inside the riveting member 3, compared with the situation in the prior art where the liquid injection hole 41 needs to be additionally arranged at the negative electrode of the battery, the setting of the liquid injection hole 41 inside the riveting member 3 on the one hand meets the use requirement of filling the electrolyte, and on the other hand also avoids the situation of opening holes in other parts of the battery, simplifying the overall structure and processing technology.

[0049] In addition, since the liquid injection hole 41 is provided at the positive electrode of the battery, the sealing piece 5 for secondarily sealing the liquid injection hole 41 is not affected by the 7R angle of the battery housing during the welding process, thus ensuring the welding quality and reliability of the sealing piece 5.

[0050] In some embodiments, the pole column 1 and the current collecting plate 2 are connected by welding. For example, after the pole column 1 and the current collecting plate 2 are riveted and fixed by the riveting member 3, the fitting contact parts of the pole column 1 and the current collecting plate 2 on the periphery of the riveting member 3 can be welded and fixed by welding, so as to further ensure the contact area between the pole column 1 and the current collecting plate 2, and further reduce the resistance between the pole column 1 and the current collecting plate 2.

[0051] It should be noted that in some other embodiments, when the riveting quality between the pole column 1 and the current collecting plate 2 is good and the resistance value between the two meets the requirements, the pole column 1 and the current collecting plate 2 may not be welded and connected anymore.

[0052] In some embodiments, the pole column 1 is provided with a first hole 11, the current collecting plate 2 is provided with a second hole 21, the first hole 11 and the second hole 21 are arranged oppositely, and the riveting member 3 is riveted to at least part of the hole walls of at least one of the first hole 11 and the second hole 21.

[0053] For example, as Figure 2 shown, the first hole 11 can penetrate the pole column 1 along the up and down direction, as Figure 3As shown, the second hole 21 can penetrate the bus bar 2 in the up-down direction. The first hole 11 and the second hole 21 can be arranged opposite to each other in the up-down direction. During assembly, the riveting part 3 is directly passed through the first hole 11 and the second hole 21, and the pole 1 and the bus bar 2 can be riveted and fixed.

[0054] A part of the hole wall of the first hole 11 or the second hole 21 can be a tapered surface. At this time, the riveting part 3 can be pressed on the tapered surface, thereby increasing the riveting and fixing effect.

[0055] In some embodiments, the first hole 11 includes a first hole section 111 and a second hole section 112. The second hole section 112 is located between the first hole section 111 and the second hole 21. The aperture of the first hole section 111 gradually becomes smaller along the direction towards the second hole section 112, and the outer peripheral wall of the riveting part 3 is pressed against the hole wall of the first hole section 111.

[0056] For example, as Figure 2 shown, the first hole section 111 can be in the shape of a tapered hole, the second hole section 112 can be in the shape of a round hole, and the first hole section 111 can be connected above the second hole section 112. During assembly, a part of the outer peripheral wall at the top of the riveting part 3 can be pressed against the hole wall of the first hole section 111, so as to realize the riveting limit between the riveting part 3 and the pole 1.

[0057] In some embodiments, the second hole 21 includes a third hole section 211 and a fourth hole section 212. The third hole section 211 is located between the fourth hole section 212 and the first hole 11. The aperture of the fourth hole section 212 gradually becomes smaller along the direction towards the third hole section 211, and the outer peripheral wall of the riveting part 3 is pressed against the hole wall of the fourth hole section 212.

[0058] For example, as Figure 3 shown, the third hole section 211 can be in the shape of a round hole, the fourth hole section 212 can be in the shape of a tapered hole, and the third hole section 211 can be connected above the fourth hole section 212. During assembly, a part of the outer peripheral wall at the bottom of the riveting part 3 can be pressed against the hole wall of the fourth hole section 212, so as to realize the riveting limit between the riveting part 3 and the bus bar 2.

[0059] In some embodiments, the riveting part 3 has a first end face 42 and a second end face 43 that are oppositely arranged in the axial direction of the riveting part 3. The first end face 42 is flush with the surface of the pole 1, and the second end face 43 is flush with the surface of the bus bar 2.

[0060] For example, as Figure 4As shown, the first end face 42 can be the upper surface of the riveting member 3, and the first end face 42 can be flush with the upper surface of the pole column 1. The second end face 43 can be the lower surface of the riveting member 3, and the second end face 43 can be flush with the lower surface of the bus bar plate 2. Thus, while the riveting member 3 is riveted and fixed through the above-mentioned first hole section 111 and the fourth hole section 212, the situation that the riveting member 3 protrudes from the surfaces of the pole column 1 and the bus bar plate 2 can be avoided, ensuring the overall flatness, and further reducing the space occupation and avoiding the situation of touching and interfering with other components.

[0061] In some embodiments, the battery lead-out structure includes a seal 4. The seal 4 is fitted in the liquid injection hole 41, and the seal 4 is used to seal the liquid injection hole 41 after the liquid injection is completed. For example, as Figure 1 shown, the seal 4 can be a sealing rubber granule. After the electrolyte is filled into the battery through the liquid injection hole 41, the seal 4 can be inserted into the liquid injection hole 41, so as to play a role in sealing the liquid injection hole 41 and avoiding the leakage of the electrolyte through the liquid injection hole 41.

[0062] In some embodiments, the top end face of the seal 4 can be flush with the above-mentioned first end face 42, so as to avoid the occupation of the external space by the seal 4 and avoid the situation of touching and interfering with the subsequent sealing sheet 5, which facilitates the assembly of the subsequent sealing sheet 5.

[0063] In some embodiments, the liquid injection hole 41 includes a fifth hole section 411 and a sixth hole section 412. The fifth hole section 411 is closer to the pole column 1 than the sixth hole section 412, and the aperture of the fifth hole section 411 gradually becomes smaller along the direction towards the sixth hole section 412.

[0064] For example, as Figure 4 shown, the fifth hole section 411 can be in the shape of a tapered hole, the sixth hole section 412 can be in the shape of a round hole, and the fifth hole section 411 can be connected above the sixth hole section 412. Since the seal 4 needs to be inserted from the fifth hole section 411 during the assembly of the seal 4, the variable diameter design of the fifth hole section 411 can improve the assembly convenience.

[0065] In some embodiments, the battery lead-out structure includes a sealing sheet 5. The pole column 1 is provided with a groove 12, the riveting member 3 is located in the area surrounded by the groove wall of the groove 12, and the sealing sheet 5 is hermetically assembled in the groove 12 to realize the sealing of the riveting member 3.

[0066] For example, as Figure 1 shown, the sealing sheet 5 can be in the shape of a round sheet, the groove 12 can be arranged at the top of the pole column 1, the notch of the groove 12 can face upward, and the above-mentioned first hole 11 can be arranged on the bottom wall of the groove 12. The entire outer peripheral contour of the groove 12 should be larger than the aperture of the first hole 11.

[0067] During assembly, the riveting part 3 can pass through the groove 12 and be inserted into the first hole 11. The sealing sheet 5 can be fixed at the notch of the groove 12 by welding. A sealing cavity can be defined between the sealing sheet 5 and the bottom wall of the groove 12. By means of the sealing sheet 5, secondary sealing and plugging of the liquid injection hole 41 can be achieved, further avoiding the leakage of the electrolyte.

[0068] In some embodiments, the material of the sealing sheet 5 is the same as that of the pole column 1. For example, the materials of both the sealing sheet 5 and the pole column 1 can be aluminum. During production, the pole column 1 can be processed and formed by machining. Compared with the stamping processing method, there is no R angle (round angle) at some edges of the pole column 1. Thus, the welding quality and the yield rate between the sealing sheet 5 and the pole column 1 can be ensured.

[0069] In some embodiments, as Figure 1 shown, the pole column 1 can be an H-shaped structure as a whole. A circular groove 13 can be provided on the outer peripheral side of the pole column 1. The circular groove 13 can extend and close along the circumferential direction of the pole column 1. A sealing ring 6 can be assembled in the circular groove 13. The battery housing 7 can be embedded in the sealing ring 6.

[0070] The battery of the embodiment of the present invention will be described below.

[0071] The battery of the embodiment of the present invention includes a battery lead-out structure, and the battery lead-out structure can be the battery lead-out structure described in any of the above embodiments. The battery can be a single cylindrical battery, and the battery lead-out structure can be provided at the top of the battery.

[0072] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and should not be construed as limitations on the present invention. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the protection scope of the present invention.

Claims

1. A battery lead-out structure, characterized in that: include: Pole and busbar; A rivet is provided in the rivet, which passes through the pole and the busbar and rivets the pole and the busbar together, and a liquid injection hole for injecting liquid into the battery is provided in the rivet.

2. The battery lead-out structure according to claim 1, characterized in that: The pole and the busbar are connected by welding.

3. The battery lead-out structure according to claim 1, characterized in that: The pole is provided with a first hole, the busbar is provided with a second hole, the first hole and the second hole are arranged opposite to each other, and the rivet is riveted to at least a part of the hole wall of at least one of the first hole and the second hole.

4. The battery lead-out structure according to claim 3, characterized in that: The first hole includes a first hole segment and a second hole segment, the second hole segment is located between the first hole segment and the second hole, the hole diameter of the first hole segment gradually decreases in a direction toward the second hole segment, and the outer peripheral wall of the rivet is pressed against the hole wall of the first hole segment; And / or, the second hole includes a third hole segment and a fourth hole segment, the third hole segment is located between the fourth hole segment and the first hole, the hole diameter of the fourth hole segment gradually decreases in the direction toward the third hole segment, and the outer peripheral wall of the rivet is pressed against the hole wall of the fourth hole segment.

5. The battery lead-out structure according to claim 1, characterized in that: The rivet has a first end surface and a second end surface which are arranged opposite to each other in the axial direction of the rivet, the first end surface is flush with the surface of the pole, and the second end surface is flush with the surface of the busbar.

6. The battery lead-out structure according to claim 1, characterized in that: A sealing member is included, which is matched in the liquid injection hole and is used to seal and block the liquid injection hole after the liquid injection is completed.

7. The battery lead-out structure according to claim 6, characterized in that: The injection hole includes a fifth hole segment and a sixth hole segment. The fifth hole segment is closer to one side of the pole than the sixth hole segment, and the hole diameter of the fifth hole segment gradually decreases in a direction toward the sixth hole segment.

8. The battery lead-out structure according to any one of claims 1 to 7, characterized in that: It comprises a sealing sheet, the pole is provided with a groove, the rivet is located in the area surrounded by the groove wall of the groove, and the sealing sheet is sealingly assembled in the groove to achieve sealing at the rivet.

9. The battery lead-out structure according to claim 8, characterized in that: The material of the sealing sheet is the same as that of the pole; And / or, the pole is a positive pole.

10. A battery, characterized in that: The invention comprises a battery lead-out structure as claimed in any one of claims 1 to 9.

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