Lithium battery and self-puncturing connection structure of pole and adapter plate for lithium battery

Abstract

The utility model discloses a self-puncturing connection structure of a pole and an adapter plate for a lithium battery and the lithium battery. According to the scheme, a self-locking riveting structure of metal cold connection is formed between the pole and the adapter plate based on a self-puncturing form. According to the scheme provided by the utility model, the self-locking riveting structure of metal cold connection is adopted between the pole and the adapter plate, so that the requirement on the cleanliness of the surface of a part is effectively reduced, and metal foreign matters cannot be generated in the connection process, thereby avoiding influencing the service life, the safety and other performances of the lithium battery.

Description

TECHNICAL FIELD

[0001] The utility model relates to power battery, concretely relates to the connecting structure between pole and adapter piece in lithium battery. BACKGROUND

[0002] The existing lithium battery needs to fix and connect the pole and adapter piece in the production and assembly process. Figure 1 As shown in the figure.

[0003] But the two ways have corresponding problems in the actual application process, and cannot meet the actual demand.

[0004] If laser welding is used, it is not suitable for welding between different materials, and the welding process has high requirements for cleanliness and cooperation gap, and welding defects such as insufficient penetration, melt-through and burst hole are easy to occur, and welding slag may also be produced in the welding process, which has a great influence on the service life and safety performance of lithium battery.

[0005] If ultrasonic welding is used, indentation will be produced on the surface of the part, which is not conducive to the subsequent welding process, and welding slag may also be produced, which affects the service life and safety of lithium battery.

[0006] Therefore, how to effectively overcome the problems existing in the fixed connection between the pole and the adapter piece based on the welding method is a problem that needs to be solved in the field. CONTENT OF THE UTILITY MODEL

[0007] In view of the problem that the existing lithium battery uses laser welding or ultrasonic welding to fix and connect the pole and the adapter piece, which affects the service life and safety of lithium battery, the purpose of the utility model is to provide a self-piercing connection structure of the pole and the adapter piece for lithium battery, so as to completely abandon the laser welding or ultrasonic welding scheme, thereby avoiding the influence on the service life and safety of lithium battery and ensuring the service life and safety of lithium battery.

[0008] In order to achieve the above purpose, the self-piercing connection structure of the pole and the adapter piece for lithium battery provided by the utility model comprises a pole and an adapter piece, and a self-locking riveting structure of metal cold connection is formed between the pole and the adapter piece based on the self-piercing form.

[0009] In some embodiments of the utility model, the pole is a copper, aluminum or copper-aluminum composite pole.

[0010] In some embodiments of the utility model, the first end part of the pole for connecting with the adapter piece forms a hollow self-piercing riveting part arranged around the central axis, the hollow self-piercing riveting part can penetrate the adapter piece and expand, and a self-locking riveting structure is formed between the pole and the adapter piece.

[0011] In some embodiments of the utility model, the connecting part of the adapter piece matched with the pole forms a counterbore structure.

[0012] In some embodiments of the utility model, the second end part of the pole is configured to form a rivet expansion connecting structure with the riveting block.

[0013] In order to achieve the above purpose, the utility model provides a lithium battery, which comprises a lithium battery body and at least one set of pole and adapter piece arranged on the lithium battery body, and a self-locking riveting structure of metal cold connection is formed between the pole and the adapter piece based on a self-piercing form.

[0014] In some embodiments of the utility model, the first end part of the pole for connecting with the adapter piece forms a hollow self-piercing riveting part arranged around the central axis, the hollow self-piercing riveting part can penetrate the adapter piece and expand, and a self-locking riveting structure is formed between the pole and the adapter piece.

[0015] In some embodiments of the utility model, the connecting part of the adapter piece matched with the pole forms a counterbore structure.

[0016] In some embodiments of the utility model, the pole is fixed on the top cover plate in the lithium battery body through the second end part and the riveting block.

[0017] In some embodiments of the utility model, the second end part of the pole is configured to form a rivet expansion connecting structure with the riveting block.

[0018] The connecting scheme between the pole and the adapter piece in the lithium battery provided by the utility model completely abandons the heat connection forms such as laser welding or ultrasonic welding, innovatively adopts the self-locking riveting structure of metal cold connection between the pole and the adapter piece, effectively reduces the cleanliness requirement of the surface of the part, and no metal foreign matter is generated in the connecting process, so that the life and safety performance of the lithium battery are avoided from being affected. BRIEF DESCRIPTION OF DRAWINGS

[0019] The utility model is further illustrated below in combination with the drawings and specific embodiments.

[0020] Figure 1 It is an example diagram of the connecting structure of the pole and the adapter piece in the existing lithium battery;

[0021] Figure 2 It is an example diagram of the structure of the pole and the adapter piece in the lithium battery in the utility model.

[0022] Figure 3 It is the three-dimensional example drawing of the connecting structure between the pole and the adapter sheet in the lithium battery in the utility model example;

[0023] Figure 4 It is the front view of the connecting structure between the pole and the adapter sheet in the lithium battery in the utility model example;

[0024] Figure 5 It is the explosion view of the connecting structure between the pole and the adapter sheet in the lithium battery in the utility model example;

[0025] Figure 6 It is the state change example drawing of the pole in the utility model example;

[0026] Figure 7 It is the state change example drawing of the pole in the utility model example. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, purposes and effects realized by the utility model easy to understand, the utility model is further described below in combination with specific drawings.

[0028] As known, the pole and the adapter sheet of the existing lithium battery adopt a hot connection scheme such as laser welding or ultrasonic welding, the utility model scheme overcomes the technical prejudice, completely gives up the hot connection form such as laser welding or ultrasonic welding, and instead innovates the self-locking riveting process of metal cold connection between the pole and the adapter sheet, effectively avoids the problems brought by the hot connection scheme under the premise of guaranteeing the reliable connection between the pole and the adapter sheet, thereby avoiding the influence on the life and safety performance of the lithium battery.

[0029] On this basis, in order to match the self-locking riveting structure of metal cold connection between the pole and the adapter sheet, the pole in the utility model scheme is preferably a copper pole, an aluminum pole or a copper-aluminum composite pole, and at the same time, the corresponding adapter sheet is matched and selected based on the material properties of the pole.

[0030] The utility model scheme is described below in detail.

[0031] Referring to Figure 2 It is the structure example drawing between the pole 100 and the adapter sheet 200 in the lithium battery in the utility model scheme.

[0032] The pole 100 and the adapter sheet 200 in the utility model scheme are configured into the self-locking riveting structure of metal cold connection based on the self-piercing form, thereby realizing the stable and reliable metal cold connection structure between the pole 100 and the adapter sheet 200.

[0033] Specifically, the pole column 100 specifically comprises a pole column body 110, and a flange portion 120 is formed on the outer side of the pole column body 110 for matched fixed connection. Here, the specific structure of the flange portion 120 is not limited, and can be determined according to actual needs. For example, the flange portion 120 here can adopt a flange plate structure in two steps.

[0034] Further, the first end portion 130 of the pole column 110 for connecting with the adapter piece 200 forms a hollow self-piercing riveting portion 140 arranged around the central axis, which can penetrate the adapter piece 200 and expand outward, thereby forming a stable self-locking riveting structure with the adapter piece 200.

[0035] As a further illustration, the hollow self-piercing riveting portion 140 on the pole column 110 preferably has a hollow structure in a “U” shape in cross section, and the port outlet is in a horn shape, which facilitates self-piercing and outward expansion after self-piercing to form a self-locking riveting structure.

[0036] Further, the main body wall thickness t1 of the hollow self-piercing riveting portion 140 is uniform, and the main body wall thickness t1 of the hollow self-piercing riveting portion 140 is specifically adapted to the material strength of the adapter piece 200 and the pole column 100, and the thickness t2 of the adapter piece 200.

[0037] As a specific illustration, in order to form an effective self-locking riveting and without the phenomenon of material piercing, and in view of the fact that the fracture elongation of different heat-treated materials is different, the following setting scheme is preferably adopted in the present scheme:

[0038] (1) If the material strength of the adapter piece 200 and the pole column 100 is all > 150 MPa, the material thickness t1 of the pole column riveting position feature = (0.8-1.6)t2, wherein t2 is the material thickness of the adapter piece 200 riveting position feature;

[0039] (2) If the material strength of the adapter piece 200 and the pole column 100 is all < 150 MPa, the material thickness t1 of the pole column riveting position feature = (0.6-1.2)t2, wherein t2 is the material thickness of the adapter piece 200 riveting position feature;

[0040] (3) If the material strength of the adapter piece 200 is < 150 MPa and the material strength of the pole column 100 is > 150 MPa, the material thickness t1 of the pole column riveting position feature = (0.6-1.4)t2, wherein t2 is the material thickness of the adapter piece 200 riveting position feature.

[0041] Further, the second end 150 on the pole 110 for connecting with the lithium battery body is configured to form a rivet connection structure with the corresponding rivet block, and thereby to realize a fixed connection structure with the lithium battery body, and then to realize a fixed setting on the lithium battery body.

[0042] As a further illustration, the second end 150 on the pole 110 is provided as a whole in a cylindrical stepped structure, thereby facilitating a stable rivet connection structure between the corresponding rivet block.

[0043] The specific structure of the adapter piece 200 in the utility model scheme is not limited, and can be determined according to actual needs.

[0044] To cooperate with the self-piercing of the pole 110, the adapter piece 200 forms a counterbore structure 220 at the connecting part 210 cooperating with the pole 100, so as to facilitate cooperation with the hollow self-piercing rivet part 140 of the pole 100.

[0045] When the pole 100 and the adapter piece 200 for lithium batteries are set, the pole 100 cooperates with the corresponding rivet block based on the second end 150 thereof, forms a rivet connection structure therebetween, and cooperates with the flange part 120 on the pole 100, thereby realizing a fixed setting of the pole 100 on the lithium battery body.

[0046] On this basis, the first end 130 of the pole 100 cooperates with the connecting part 210 on the adapter piece 200 based on the hollow self-piercing rivet part 140 thereon, under the action of an external force, the hollow self-piercing rivet part 140 can penetrate the connecting part 210 of the adapter piece 200 and synchronously expand outwardly under the cooperation with the flange part 120 on the pole 100, and contact and press the surface of the adapter piece 200, thereby forming a stable self-locking rivet structure between the pole 100 and the adapter piece 200; and thereby forming a stable and reliable metal cold connection structure between the pole 100 and the adapter piece 200.

[0047] The entire fixed connection process is in the form of metal cold connection, without any form of thermal connection, effectively reducing the cleanliness requirement of the surface of the part, and without generating metal foreign matters in the connection process, so as not to affect the service life and safety performance of the lithium battery.

[0048] The utility model scheme is further illustrated by specific application examples.

[0049] Here, the bipolar structure of the negative pole assembly and the positive pole assembly arranged on the top cover 30 of the lithium battery body is taken as an example.

[0050] Referring to Figure 3 and Figure 4In the present example, the negative pole post assembly 10 and the positive pole post assembly 20 are respectively arranged at two ends of the top cover 30 of the lithium battery body, wherein the negative pole post in the negative pole post assembly 10 is fixedly connected with the top cover 30 based on the expansion rivet connection structure, and the negative pole post is fixedly connected with the negative pole adapter piece based on the self-locking rivet connection structure; similarly, the positive pole post in the positive pole post assembly 20 is fixedly connected with the top cover 30 based on the expansion rivet connection structure, and the positive pole post is fixedly connected with the positive pole adapter piece based on the self-locking rivet connection structure.

[0051] Referring to Figure 5 In the present example, the top cover 30 is specifically composed of a top cover plate 31, a first internal insulation plastic piece 32, a second internal insulation plastic piece 33, an explosion-proof valve 34 and a protection piece 35.

[0052] The top cover plate 31 is overall rectangular, and two ends thereof are formed with a first connecting hole 31a and a second connecting hole 31b for connecting the negative pole post assembly and the positive pole post assembly.

[0053] On this basis, in order to improve the stability of the fixed connection with the negative pole post assembly and the positive pole post assembly, the present example forms a corresponding first installation groove structure 31c and a second installation groove structure 31d in the periphery of the first connecting hole 31a and the second connecting hole 31b, respectively, to cooperate with the first connecting hole 31a and the second connecting hole 31b.

[0054] Here, the specific structure form of the first installation groove structure 31c and the second installation groove structure 31d is not limited, and can be determined according to actual needs. As an example, the installation groove structure is preferably square.

[0055] On this basis, the top cover plate 31 is formed with an installation hole 31f for installing the explosion-proof valve 34 at a middle position, and the installation hole 31f is matched with the explosion-proof valve 34 and the protection piece 35.

[0056] Further, the explosion-proof valve 34 is installed in the installation hole 31f on the top cover plate 31 through a welding structure, and the structure of the explosion-proof valve 34 and the specific installation welding structure are not limited here, and can be determined according to actual needs.

[0057] On this basis, the protection piece 35 is fixedly arranged on the installation hole 31f on the top cover plate 31 in the direction of the first surface of the top cover plate 31 through a bonding structure, so as to cover the explosion-proof valve 34 and protect the explosion-proof valve 34. The structure of the protection piece 35 and the specific arrangement scheme are not limited here, and can be determined according to actual needs.

[0058] The first internal insulating plastic part 32 in the top cover 30 is integrally adapted to the second surface of the top cover plate 31, and corresponding to the positions of the first connecting hole 31a and the second connecting hole 31b on the top cover plate 31, the first internal insulating plastic part 32 and the second internal insulating plastic part 33 are respectively provided with corresponding connecting through holes 32a and 33a; in addition, the first internal insulating plastic part 32 and the second internal insulating plastic part 33 are respectively provided with corresponding installation grooves 32b and 33b at positions corresponding to the installation hole 31f on the top cover plate 31, and the installation grooves 32b and 33b can be adapted to the explosion-proof valve 34 by mutual cooperation.

[0059] The first internal insulating plastic part 32 and the second internal insulating plastic part 33 of the structure are cooperatively installed on the second surface of the top cover plate 31, and the connecting through hole 32a on the first internal insulating plastic part 32 corresponds to the first connecting hole 31a on the top cover plate 31, and the connecting through hole 33a on the second internal insulating plastic part 33 corresponds to the second connecting hole 31b on the top cover plate 31; the installation groove 32b on the first internal insulating plastic part 32 cooperates with the installation groove 33b on the second internal insulating plastic part 33, and just covers the explosion-proof valve 34 installed in the installation hole 31f on the top cover plate 31.

[0060] For the top cover 30 with the above structure, the negative pole post assembly 10 in the present example is specifically composed of a negative pole post 11, a negative pole adapter piece 12, a first sealing ring 13, a first external insulating plastic part 14, and a negative pole riveting block 15.

[0061] The overall structure of the negative pole post 11 and the negative pole adapter piece 12 in the negative pole post assembly 10 is as described above, and will not be described here. The negative pole post 11 is preferably made of aluminum or copper or copper-aluminum composite material; the negative pole adapter piece 12 is formed with a riveting portion 12a at the end portion.

[0062] The first sealing ring 13 in the negative pole post assembly 10 is a T-shaped sealing ring, which is integrally adapted to and can be installed in the connecting through hole 32a on the first internal insulating plastic part 32; at the same time, the internal through hole of the first sealing ring 13 is adapted to the second end portion of the negative pole post 11 and can be arranged therein.

[0063] The overall structure of the first external insulating plastic piece 14 in the negative pole post assembly 10 is adapted to the first installation groove structure 31c on the top cover plate 31 and can be installed therein. Meanwhile, the upper surface of the first external insulating plastic piece 14 is formed with an installation groove 14a adapted to the negative riveting block 15. The corner of the installation groove 14a is formed with a limiting step 14b for limiting the negative riveting block 15 in the circumferential direction and ensuring the stability and reliability of the riveting connection between the negative riveting block 15 and the negative pole post 11.

[0064] Further, a through hole 14c is formed in the bottom of the installation groove 14a on the first external insulating plastic piece 14, which is adapted to the second end of the negative pole post 11 and can accommodate the second end of the negative pole post 11.

[0065] The negative riveting block 15 in the negative pole post assembly 10 is adapted to the installation groove 14a on the first external insulating plastic piece 14 and can be installed therein. Meanwhile, a connecting through hole 15a is formed in the middle of the negative riveting block 15, which is adapted to the second end of the negative pole post 11 and can form a riveting connection structure.

[0066] The negative pole post assembly 10 with such a structure is assembled and fixed with the top cover 30 by installing the first sealing ring 13 in the connecting through hole 32a on the first internal insulating plastic piece 32 and installing the first external insulating plastic piece 14 in the first installation groove structure 31c on the top cover plate 31.

[0067] On this basis, the second end of the negative pole post assembly 10 is sequentially inserted through the first sealing ring 13, the first connecting hole 31a on the top cover plate 31, the through hole 14c on the first external insulating plastic piece 14, and the connecting through hole 15a of the negative riveting block 15. At this time, the flange of the negative pole post 11 abuts against the surface of the first internal insulating plastic piece 32. In this state, the second end of the negative pole post 11 inserted into the connecting through hole 15a of the negative riveting block 15 is riveted, so that a riveting connection structure is formed between the second end of the negative pole post 11 and the negative riveting block 15. Then, the negative riveting block 15, the first external insulating plastic piece 14, the top cover plate 31, the first internal insulating plastic piece 32, the first sealing ring 13, and the negative pole post 11 are fixed and connected together, as shown in Figure 6

[0068] Meanwhile, the flange of the negative pole post 11 presses against the first sealing ring 13, forming a sealing structure between the negative pole post 11 and the first internal insulating plastic piece 32.

[0069] ​For the negative pole post 11 fixedly arranged on the top cover plate 31, the riveting part 12a on the negative pole adapter piece 12 is arranged corresponding to the hollow self-piercing riveting part on the first end part of the negative pole post 11, and on this basis, through the riveting operation, the hollow self-piercing riveting part can penetrate the riveting part 12a of the adapter piece 12 and expand to the surrounding, the formed expansion part presses the outer surface of the adapter piece 12, and then a stable self-locking riveting structure is formed between the negative pole post 11 and the adapter piece 12, as shown in Figure 7

[0070] Further, for the top cover 30 with the above structure, the positive pole post assembly 20 in the present example is specifically composed of the positive pole post 21, the positive pole adapter piece 22, the second sealing ring 23, the second external insulation plastic part 24 and the positive pole riveting block 25.

[0071] The specific components and arrangement scheme of the positive pole post assembly 20 are the same as those of the negative pole post assembly 10, which will not be repeated here.

[0072] The positive pole post 21 in the positive pole post assembly 20 is preferably made of aluminum.

[0073] Therefore, it can be seen that the negative pole post assembly 10 and the positive pole post assembly 20 in the present example are fixedly connected with the top cover 30 based on the metal cold connection structure (the riveting connection structure between the pole post and the riveting block); at the same time, the pole posts in the negative pole post assembly 10 and the positive pole post assembly 20 are fixedly connected with the adapter pieces based on the self-locking riveting structure of the metal cold connection, and the whole fixed connection structure completely abandons the hot connection form, effectively ensuring the service life and safety performance of the lithium battery.

[0074] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.​

Claims

1. A self-piercing connection structure of a pole and a tab for a lithium battery, characterized by, The pole and the adapter plate are connected by a self-locking riveting structure based on a self-piercing form of metal cold connection, a hollow self-piercing riveting part around a middle axis is formed on a first end of the pole for connecting with the adapter plate, the hollow self-piercing riveting part can penetrate and expand the adapter plate, and a self-locking riveting structure is formed between the pole and the adapter plate.

2. The self-piercing connection structure of a pole piece and a jumper for a lithium battery according to claim 1, characterized by, The pole is made of copper, aluminum or copper-aluminum composite.

3. The self-piercing connection structure of a pole piece and a jumper for a lithium battery according to claim 1, characterized in that, A counterbore structure is formed on a connecting part of the adapter plate matched with the pole.

4. The self-piercing connection structure of a pole piece and a jumper for a lithium battery according to claim 1, characterized by, A second end of the pole is configured to form a rivet connection structure with a riveting block.

5. A lithium battery comprising a lithium battery body and at least one set of pole posts and adapter tabs disposed on the lithium battery body, wherein, The pole and the adapter plate are connected by a self-locking riveting structure based on a self-piercing form of metal cold connection, a hollow self-piercing riveting part around a middle axis is formed on a first end of the pole for connecting with the adapter plate, the hollow self-piercing riveting part can penetrate and expand the adapter plate, and a self-locking riveting structure is formed between the pole and the adapter plate.

6. The lithium battery of claim 5, wherein, A counterbore structure is formed on a connecting part of the adapter plate matched with the pole.

7. The lithium battery of claim 5, wherein, The pole is fixed on a top cover plate in the lithium battery body through the second end matched with the riveting block.

8. The lithium battery of claim 7, wherein, A second end of the pole is configured to form a rivet connection structure with a riveting block.

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