Battery connection structure and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery connecting structure and a battery, the battery connecting structure comprises a connecting block riveted with a cover body, and an insulating piece arranged between the connecting block and the cover body; the connecting block comprises a first base table and a pipe body part formed by extending one side of the first base table in the thickness direction of the first base table, the first base table is sunken to form a first welding part, the inner side circumferential wall of the pipe body part is enclosed to form a containing cavity, and one end of the containing cavity is sealed by the first welding part; and the connecting column comprises a second base station and a column body part connected with the second base station, the other side of the second base station is suitable for being welded with the tab, and one end, far away from the second base station, of the column body part is suitable for penetrating through the accommodating cavity and being welded with the first welding part. The battery connecting structure provided by the utility model not only reduces the complexity of battery assembly, is beneficial to improving the production efficiency and reducing the production cost, but also is beneficial to saving the internal space of the battery and improving the volume energy density of the battery.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to a battery connection structure and a battery. Background Art

[0002] In the existing cell structure, the pole column and the tab of the pole group are usually connected by a connecting piece, and the pole column and the riveting block are first riveted and then welded and fixed. There are many components and processes, and the assembly is complex. Summary of the Utility Model

[0003] In view of this, the utility model provides a battery connection structure and a battery to solve the problems of many components and processes and complex assembly in the existing battery connection structure.

[0004] In a first aspect, the utility model provides a battery connection structure, including:

[0005] A connection block, riveted to the cover body, an insulating part is arranged between the connection block and the cover body, and the insulating part is suitable for insulating and sealing between the connection block and the cover body; the connection block includes a first base and a tube body part extending along the thickness direction of one side of the first base, a first welding part is recessed on the first base, the inner peripheral wall of the tube body part encloses to form a receiving cavity, and one end of the receiving cavity is closed by the first welding part;

[0006] A connection column, including a second base and a column body part connected to the second base, the other side of the second base is suitable for welding with the tab, and one end of the column body part away from the second base is suitable for passing through the receiving cavity and welding with the first welding part.

[0007] Beneficial Effects: The battery connection structure provided by the utility model mainly includes a connection block and a connection column. In the manufacturing process, before the pole group enters the shell, the second base of the connection column is welded to the tab of the pole group. During the process of the pole group entering the shell, the column body part of the connection column passes through the receiving cavity and cooperates with the first welding part, and then one end of the column body part away from the second base is welded to the first welding part to realize the electrical connection between the pole group and the connection block, so as to lead the electric quantity inside the battery to the outside. In this way, setting a connecting piece between the pole column and the tab of the pole group is avoided, not only the connecting piece and its assembly process are saved, the complexity of battery assembly is reduced, which is beneficial to improving production efficiency and reducing production costs, but also by passing the column body part through the receiving cavity, it is beneficial to save the internal space of the battery and improve the volume energy density of the battery.

[0008] In an optional embodiment, a riveting part is arranged at one end of the tube body part away from the first welding part, the riveting part extends along a direction away from the central axis of the tube body part from the peripheral edge of the tube body part, and the riveting part and the first base are suitable for riveting and fixing the connection block with the insulating part and the cover body.

[0009] Beneficial effects: By providing a riveting portion on the connection block and jointly cooperating with the first base through the riveting portion, the insulating member is clamped between the connection block and the cover body, thereby achieving riveting and sealing between the connection block and the cover body.

[0010] In an alternative embodiment, a first guiding portion is formed between the tube body portion and the riveting portion, and the first guiding portion is adapted to guide the columnar portion into the accommodating cavity.

[0011] Beneficial effects: By providing a first guiding portion on the connection block, it is convenient to easily insert the columnar portion into the accommodating cavity through the guiding of the first guiding portion during the assembly process, thereby improving the assembly efficiency.

[0012] In an alternative embodiment, one side of the first welding portion close to the columnar portion is penetration-welded to one end of the columnar portion.

[0013] Beneficial effects: Penetration welding is adopted for welding, enabling the laser to penetrate the first welding portion and melting and connecting the first welding portion with the end of the columnar portion far from the second base, thereby achieving the purpose of electrical connection.

[0014] In an alternative embodiment, a second welding portion is provided at one end of the columnar portion far from the second base, and the second welding portion is adapted to perform penetration welding with the first welding portion;

[0015] The thickness of the second welding portion is greater than or equal to the thickness of the first welding portion.

[0016] Beneficial effects: By performing penetration welding between the first welding portion of the connection block and the second welding portion of the connection column, fixed connection and electrical connection between the connection block and the connection column are achieved; the thickness of the second welding portion is greater than or equal to the thickness of the first welding portion, thereby reducing the thickness of the penetration welding surface, reducing the welding power, avoiding the generation of pores, and improving the reliability of welding.

[0017] In an alternative embodiment, a second guiding portion is formed at the junction of the end face of the second welding portion and the side peripheral wall of the second welding portion, and the second guiding portion is adapted to guide the columnar portion into the accommodating cavity.

[0018] Beneficial effects: By providing a second guiding portion on the connection column, it is convenient to jointly cooperate with the first guiding portion for guiding during the assembly process, and easily insert the columnar portion into the accommodating cavity, thereby improving the assembly efficiency.

[0019] In an alternative embodiment, a counterbore is formed on the first base, and the counterbore is located on the side of the first welding portion away from the accommodating cavity, and the counterbore is a welding area.

[0020] Beneficial effects: Thus, it prevents the welding mark from protruding from the end face of the first base, avoiding affecting the subsequent assembly of the battery.

[0021] In a second aspect, the present utility model further provides a battery, comprising: a cover body, and the battery connection structure as described above.

[0022] Advantageous effects: The battery in the second aspect includes the battery connection structure in the first aspect. Therefore, the battery in the second aspect includes all the advantageous effects of the battery connection structure in the first aspect.

[0023] In an optional embodiment, the battery further includes a pole group, a tab is provided on the pole group, and the tab is disposed opposite to the connection block;

[0024] The second base is welded and fixed to the tab before the pole group is inserted into the case; the columnar portion passes through the accommodation cavity and is welded to the first welding portion after the pole group is inserted into the case.

[0025] Advantageous effects: The tab is disposed opposite to the connection block, and the connecting column is welded and fixed to the tab of the pole group by the second base before the pole group is inserted into the case. During the insertion process, the columnar portion of the connecting column passes through the accommodation cavity and is welded to the first welding portion, which not only omits the connecting piece and its assembly process, reduces the complexity of battery assembly, but also is beneficial to saving the internal space of the battery and improving the volumetric energy density of the battery by passing the columnar portion through the accommodation cavity.

[0026] In an optional embodiment, the tab forms a third welding portion by ironing, and the third welding portion is welded to the second base.

[0027] Advantageous effects: Avoiding bending the tab not only greatly saves the internal space of the battery, improves the volumetric energy density of the battery, but also reduces the manufacturing process difficulty. Description of the Drawings

[0028] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 It is an assembly schematic diagram of a battery connection structure of an embodiment of the present utility model with a cover body and a pole group;

[0030] Figure 2 It is a cross-sectional view of a connection block of a battery connection structure of an embodiment of the present utility model;

[0031] Figure 3 It is a cross-sectional view of a connecting column of a battery connection structure of an embodiment of the present utility model;

[0032] Figure 4Explosion diagram of the connection column and the electrode group of a battery connection structure according to an embodiment of the present invention;

[0033] Figure 5 is Figure 4 partial enlarged schematic diagram at Q in

[0034] Figure 6 Stereogram of the connection column and the electrode group of a battery connection structure according to an embodiment of the present invention after welding is completed.

[0035] Explanation of reference numerals:

[0036] 10. Connection block; 11. First base; 12. Tube body part; 13. First welding part; 14. Accommodation cavity; 15. Riveting part; 16. First guiding part; 17. Counterbore;

[0037] 20. Connection column; 21. Second base; 22. Column body part; 23. Second welding part; 24. Second guiding part;

[0038] 30. Insulating part;

[0039] 40. Cover body;

[0040] 50. Electrode group; 51. Third welding part. Detailed implementation manners

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0042] Next, in conjunction with Figures 1 to 6 , the embodiments of the present invention will be described.

[0043] According to an embodiment of the present invention, on the one hand, a battery connection structure is provided, including:

[0044] A connection block 10, which is riveted to the cover body 40. An insulating part 30 is arranged between the connection block 10 and the cover body 40. The insulating part 30 is adapted to insulate and seal between the connection block 10 and the cover body 40; Please refer to Figure 2As shown, the connecting block 10 includes a first base 11 and a tube portion 12 extending from one side of the first base 11 along its own thickness direction. The first base 11 is snap-fitted to one side of the cover 40 in the thickness direction, and the tube portion 12 penetrates through the cover 40 and extends to the other side of the cover 40 in the thickness direction; a first welding portion 13 is recessed along the thickness direction on the first base 11, and an accommodation cavity 14 is formed by enclosing the inner peripheral wall of the tube portion 12, and one end of the accommodation cavity 14 is closed by the first welding portion 13;

[0045] The connecting column 20, please refer to Figure 3 As shown, it includes a second base 21 and a column portion 22 connected to one side of the second base 21 along its own thickness direction. The other side of the second base 21 is suitable for welding with the tab, and one end of the column portion 22 away from the second base 21 is suitable for passing through the accommodation cavity 14 and welding with the first welding portion 13.

[0046] It should be noted that the insulating member 30 may include upper plastic, lower plastic and / or a sealing ring, and the specific structure of the insulating member 30 is not specifically limited herein.

[0047] Furthermore, the first welding portion 13 and the end of the column portion 22 away from the second base 21 in the thickness direction can be electrically connected by penetration welding.

[0048] The battery connection structure provided by the present utility model mainly includes a connecting block 10 and a connecting column 20. In the manufacturing process, before the electrode group is put into the shell, the second base 21 of the connecting column 20 is welded to the tab of the electrode group. During the process of putting the electrode group into the shell, the column portion 22 of the connecting column 20 passes through the accommodation cavity 14 and cooperates with the first welding portion 13, and then the end of the column portion 22 away from the second base 21 is welded to the first welding portion 13 to realize the electrical connection between the electrode group and the connecting block 10, thereby leading the electric quantity inside the battery to the outside. In this way, setting a connecting piece between the pole column and the tab of the electrode group is avoided, which not only saves the connecting piece and its assembly process, reduces the complexity of battery assembly, is beneficial to improving production efficiency and reducing production costs, but also by passing the column portion 22 through the accommodation cavity 14, it is beneficial to save the internal space of the battery and improve the volume energy density of the battery.

[0049] In some embodiments, please refer to Figure 2 As shown, a riveting portion 15 is provided at one end of the tube portion 12 away from the first welding portion 13. The riveting portion 15 extends from the peripheral edge of the tube portion 12 along a direction away from the central axis of the tube portion 12. Please also refer to Figure 1 As shown, the riveting portion 15 and the first base 11 are suitable for riveting and fixing the connecting block 10 with the insulating member 30 and the cover 40.

[0050] Furthermore, the first base 11 is disposed on the side of the cover body 40 away from the pole group 50 along its own thickness direction, and the riveting portion 15 is disposed on the side of the cover body 40 close to the pole group 50 along its own thickness direction. The first base 11 and the riveting portion 15 are adapted to clamp the insulating member 30 between the connecting block 10 and the cover body 40.

[0051] In this embodiment, by providing the riveting portion 15 on the connecting block 10 and cooperating with the first base 11 through the riveting portion 15, the insulating member 30 is clamped between the connecting block 10 and the cover body 40, thereby realizing the riveting and sealing between the connecting block 10 and the cover body 40.

[0052] In some embodiments, please refer to Figure 2 As shown, a first guiding portion 16 can be formed by rounding the corners between the tube body portion 12 and the riveting portion 15. The first guiding portion 16 is adapted to guide the column body portion 22 into the accommodating cavity 14.

[0053] In this embodiment, by providing the first guiding portion 16 on the connecting block 10, it is convenient to easily load the column body portion 22 into the accommodating cavity 14 through the guiding of the first guiding portion 16 during the assembly process, thereby improving the assembly efficiency.

[0054] In some embodiments, please also refer to Figures 1 - 3 As shown, one side of the first welding portion 13 close to the column body portion 22 is penetration-welded to one end of the column body portion 22.

[0055] It should be noted that during the manufacturing process, when the column body portion 22 is loaded into the accommodating cavity 14 and reaches the specified position relative to the first welding portion 13, penetration welding is performed, so that the laser penetrates the first welding portion 13, and the first welding portion 13 and the end of the column body portion 22 away from the second base 21 are melted and connected, thereby achieving the purpose of electrical connection.

[0056] In some embodiments, please refer to Figure 3 As shown, a second welding portion 23 is provided at one end of the column body portion 22 away from the second base 21. The second welding portion 23 is adapted to perform penetration welding with the first welding portion 13;

[0057] The thickness of the second welding portion 23 is greater than or equal to the thickness of the first welding portion 13.

[0058] It should be noted that if the thickness of the first welding portion 13 is too large, it is easy to cause too high laser energy, resulting in the gas accumulated in the middle of the first welding portion 13 not being discharged in time, generating pores and affecting the reliability of the welding.

[0059] In this embodiment, the first welding portion 13 of the connection block 10 and the second welding portion 23 of the connection column 20 are penetration-welded to achieve fixed connection and electrical connection between the connection block 10 and the connection column 20; the thickness of the second welding portion 23 is greater than or equal to the thickness of the first welding portion 13, thereby reducing the thickness of the penetration-welded surface, reducing the welding power, avoiding the generation of pores, and improving the reliability of welding.

[0060] In some embodiments, please refer to Figure 3 As shown, a second guiding portion 24 is formed at the junction of the end face of the second welding portion 23 and the circumferential side wall of the second welding portion 23. The second guiding portion 24 is adapted to guide the columnar portion 22 into the receiving cavity 14. Specifically, the second guiding portion 24 can be formed by rounding the corners between the second welding portion 23 and the columnar portion 22.

[0061] In this embodiment, by providing the second guiding portion 24 on the connection column 20, it is convenient to cooperate with the first guiding portion 16 through the second guiding portion 24 during the assembly process for guiding, and the columnar portion 22 can be easily inserted into the receiving cavity 14, thereby improving the assembly efficiency.

[0062] In some embodiments, please refer to Figure 2 As shown, a counterbore 17 is formed on the first base 11. The counterbore 17 is located on the side of the first welding portion 13 away from the receiving cavity 14. The counterbore 17 is a welding area, thereby preventing the welding mark from protruding from the end face of the first base 11 and avoiding affecting the subsequent assembly of the battery.

[0063] Furthermore, the counterbore 17 can be circular.

[0064] According to an embodiment of the present invention, on the other hand, a battery is further provided, including: a cover body 40, and the battery connection structure as described above.

[0065] The battery in this embodiment includes the above battery connection structure. Therefore, the battery in this embodiment includes all the beneficial effects of the above battery connection structure.

[0066] In some embodiments, please also refer to Figures 4 - 6 As shown, the battery further includes a pole group 50 provided with pole tabs. Please also refer to Figure 1 As shown, the pole tabs are disposed opposite to the connection block 10;

[0067] The second base 21 is welded and fixed to the pole tabs before the pole group 50 is inserted into the case; the columnar portion 22 passes through the receiving cavity 14 and is welded to the first welding portion 13 after the pole group 50 is inserted into the case.

[0068] Furthermore, the pole tabs and the second base 21 are electrically connected through penetration welding.

[0069] In this embodiment, the tab is disposed opposite to the connecting block 10. Before the electrode group 50 is inserted into the case, the connecting column 20 is welded and fixed to the tab of the electrode group through the second base 21. During the process of inserting into the case, the column part 22 of the connecting column 20 passes through the accommodating cavity 14 and is welded to the first welding part 13. This not only eliminates the connecting piece and its assembly process, reduces the complexity of battery assembly, but also saves the internal space of the battery and improves the volume energy density of the battery by passing the column part 22 through the accommodating cavity 14.

[0070] In some embodiments, as shown in Figure 5 the figure, the tab forms the third welding part 51 by flattening, and the third welding part 51 is welded to the second base 21.

[0071] It should be noted that the tab forms the third welding part 51 through the flattening process, and then the second base 21 is welded to the third welding part 51, which avoids bending the tab. This not only greatly saves the internal space of the battery, improves the volume energy density of the battery, but also reduces the manufacturing process difficulty.

[0072] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A battery connection structure, characterized in that, Comprising: A connecting block, riveted to the cover body, an insulating member is disposed between the connecting block and the cover body, and the insulating member is adapted to insulate and seal between the connecting block and the cover body; The connecting block includes a first base and a tube body portion extending along its own thickness direction from one side of the first base. A first welding portion is recessed on the first base. The inner peripheral wall of the tube body portion encloses a receiving cavity, and one end of the receiving cavity is closed by the first welding portion; A connecting column, including a second base and a column body portion connected to the second base. The other side of the second base is adapted to be welded to the tab. One end of the column body portion away from the second base is adapted to pass through the receiving cavity and be welded to the first welding portion.

2. The battery connection structure according to claim 1, wherein One end of the tube body portion away from the first welding portion is provided with a riveting portion, and the riveting portion extends from the peripheral side edge of the tube body portion in a direction away from the central axis of the tube body portion. The riveting portion and the first base are adapted to rivet and fix the connecting block to the insulating member and the cover body.

3. The battery connection structure according to claim 2, wherein, A first guiding portion is formed between the tube body portion and the riveting portion, and the first guiding portion is adapted to guide the column body portion into the receiving cavity.

4. The battery connection structure according to claim 1, wherein One side of the first welding portion close to the column body portion is penetration-welded to one end of the column body portion.

5. The battery connection structure according to claim 2, characterized in that, One end of the column body portion away from the second base is provided with a second welding portion, and the second welding portion is adapted to perform penetration welding with the first welding portion; The thickness of the second welding portion is greater than or equal to the thickness of the first welding portion.

6. The battery connection structure according to claim 5, characterized in that, A second guiding portion is formed at the junction of the end face of the second welding portion and the peripheral side wall of the second welding portion, and the second guiding portion is adapted to guide the column body portion into the receiving cavity.

7. The battery connection structure according to any one of claims 1-6, characterized in that, A counterbore is formed on the first base, and the counterbore is located on the side of the first welding portion away from the receiving cavity, and the counterbore is a welding area.

8. A battery, characterized in that, Comprising: A cover body, and a battery connection structure according to any one of claims 1 to 7 above.

9. The battery according to claim 8, wherein The battery further includes a pole group, and a tab is provided on the pole group, and the tab is disposed opposite to the connecting block; The second base is welded and fixed to the tab before the pole group is inserted into the shell; the column body portion passes through the receiving cavity and is welded to the first welding portion after the pole group is inserted into the shell.

10. The battery according to claim 9, wherein, The tab is formed into a third welding portion by ironing, and the third welding portion is welded to the second base.

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