CN221530191U - Battery cell - Google Patents

Abstract

The utility model relates to the technical field of batteries, and discloses a battery, which comprises: a housing having an accommodation space; the battery cell is arranged corresponding to the accommodating space and comprises a plurality of layers of lugs; the pole assembly is arranged on the shell and comprises a pole body, and the pole body is riveted and fixed with the multilayer pole lugs or in punching connection with the multilayer pole lugs. According to the utility model, the multi-layer tab and the pole body are riveted or connected in a punching manner, the multi-layer tab is not required to be welded in advance, the welded tab and the transfer sheet are not required to be welded, and the transfer sheet and the pole body are welded, so that the connection steps of the multi-layer tab and the pole body are simplified, independent pre-welding equipment of the tab and the transfer sheet are saved, the equipment cost is reduced, the production process is simplified, the transfer sheet is omitted, the integral structure of the battery is simplified, the multi-layer tab and the pole body are not required to be connected in a welding manner, welding slag is avoided, the cleanliness inside the battery core is ensured, and the potential safety hazard is avoided.

Description

Battery

Technical Field

The utility model relates to the field of batteries, in particular to batteries.

Background Art

As one of the devices for providing electrical energy, the battery is constantly developing. In order to increase the capacity of the battery, a plurality of battery cells (generally more than two) are usually contained in the battery casing. Among them, the battery cell can be formed by winding a core or stacking. Before placing multiple battery cells into the casing, the tabs of the battery cells need to be welded together, and then the welded tabs and the adapter are welded and fixed, and then the adapter is welded to the poles on the cover plate, and finally the battery cell is placed into the casing and the cover plate is welded to the casing to form a finished battery. Therefore, multiple welding is required before the battery cell is placed into the casing, and the welding slag produced by welding can easily enter the interior of the battery cell, causing the battery cell to short-circuit poorly and create safety hazards.

Utility Model Content

In view of this, the utility model provides a battery to solve the problem in the prior art that multiple welding is required before the battery cell is put into the shell, and the welding slag generated by the welding easily enters the interior of the battery cell, causing the battery cell to short-circuit and create a safety hazard.

The utility model provides a battery, comprising: a shell with a containing space; a battery core, arranged corresponding to the containing space, the battery core comprising multiple layers of pole ears; a pole assembly, arranged on the shell, the pole assembly comprising a pole body, the pole body and the multiple layers of the pole ears are riveted and fixed or stamped.

Beneficial effects: The multi-layer pole ear is fixed to the pole body by riveting or stamping, and there is no need to pre-weld the multi-layer pole ear, and there is no need to weld the welded pole ear to the adapter plate, and the pole body is welded through the adapter plate, which simplifies the connection steps between the multi-layer pole ear and the pole body, saves the separate pre-welding equipment for the pole ear and the welding equipment for the pole ear and the adapter plate, reduces the equipment cost, simplifies the production process, and eliminates the adapter plate, simplifies the overall structure of the battery, and there is no need to use welding to connect the multi-layer pole ear and the pole body, so as to avoid the generation of welding slag, ensure the cleanliness of the battery cell, and avoid safety hazards.

In an optional embodiment, the battery further comprises a protective sheet, which is arranged on a side of the multi-layered pole tabs away from the pole body, and the protective sheet together with the multi-layered pole tabs are riveted or stamped to the pole body.

Beneficial effect: The protective sheet is used to protect the multi-layer tab on the side away from the pole body, so as to avoid the force being directly applied to the tab during the riveting process or the stamping process, thereby avoiding damage to the tab.

In an optional embodiment, the battery further comprises a rivet, one end of which is connected to the pole body, and the other end of which is fixed to a side of the protective sheet away from the pole ear.

Beneficial effect: The pole body, the multi-layer pole ear and the protective sheet are connected and fixed by using rivets. The connection method is simple and reliable, and the deformation of the pole body, the multi-layer pole ear and the protective sheet during the connection process is reduced, thereby ensuring the integrity of the battery.

In an optional embodiment, the rivet includes a connecting section and a supporting section, the connecting section is connected to the supporting section, the connecting section and the supporting section are arranged at an angle so that the rivet forms a bending structure, the connecting section is connected to the pole body, and the multiple layers of the pole ears and the protective sheet are located between the pole body and the supporting section.

In an optional embodiment, the rivet includes a riveted end, an insert post and a fixed end, the insert post is connected between the riveted end and the fixed end, the riveted end is riveted into the pole body, the insert post passes through the protective sheet and corresponds to the multiple layers of the pole ear, and the fixed end is fixed to a side of the protective sheet away from the pole ear.

In an optional embodiment, the pole body, the multiple layers of the pole tabs and the protection sheet are stamped simultaneously to form a stamping deformation zone, and the pole body, the multiple layers of the pole tabs and the protection sheet are connected and arranged in the stamping deformation zone.

Beneficial effect: By stamping the pole body, the multi-layer pole ear and the protection sheet at the same time, a stamping deformation zone is formed, so that the pole body, the multi-layer pole ear and the protection sheet are connected at the stamping deformation zone, and the connection method is simple and easy to process.

In an optional embodiment, the shell is provided with a liquid injection hole, which is connected to the accommodating space; and/or the pole body is provided with a liquid injection hole, the protective sheet is provided with a connecting hole, and the liquid injection hole is connected to the accommodating space through the connecting hole.

In an optional embodiment, the housing includes a shell and a cover plate, the shell has an opening, the cover plate is arranged corresponding to the opening, the shell and the cover plate enclose the accommodating space, and the pole assembly is arranged corresponding to the shell and/or the cover plate.

In an optional embodiment, the cover plate and the shell are welded, the pole assembly and the cover plate are welded, and the welding position of the cover plate and the shell is arranged on the same side as the welding position of the pole assembly and the cover plate.

Beneficial effects: The two welding positions are set on the same side, and can be carried out successively with one welding device, which reduces welding equipment, reduces production costs, facilitates welding, and improves production efficiency.

In an optional embodiment, the electrode tab includes a positive electrode tab and a negative electrode tab, the electrode body includes a first electrode tab and a second electrode tab, the positive electrode tab is connected to the first electrode tab, and the negative electrode tab is connected to the second electrode tab.

In an optional embodiment, several battery cells are arranged side by side along the thickness direction, and the pole ears of the same polarity of each battery cell are arranged correspondingly, the first pole and the second pole are arranged corresponding to the middle positions of several battery cells along the thickness direction, the positive pole ear of each battery cell is connected to the first pole, and the negative pole ear of each battery cell is connected to the second pole, the positive pole ear of each battery cell is arranged corresponding to the side of the battery cell close to the first pole, and the negative pole ear of each battery cell is arranged corresponding to the side of the battery cell close to the second pole.

Beneficial effect: When the tabs of several battery cells are welded to the same pole, the tabs are extended to the middle position along the thickness direction, shortening the tab length, reducing material waste and reducing production costs.

In an optional embodiment, the pole assembly further includes an insulating member, wherein the insulating member is located between the housing and the pole body.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic diagram of the internal structure of a battery in the thickness direction of an embodiment of the utility model (a schematic diagram of the cross-sectional structure along line A-A in FIG13 );

FIG2 is a schematic diagram of the connection structure between the battery cell and the pole body according to an embodiment of the utility model;

3 is a schematic structural diagram of a first embodiment of the present invention in which a pole body, a multi-layer pole tab and a protective sheet are connected by a rivet before riveting;

FIG4 is a schematic diagram of the structure of the pole body, the multi-layer pole lug and the protection sheet shown in FIG3 after being riveted together by a riveting member;

FIG5 is a schematic structural diagram of a second embodiment of the present invention in which a pole body, a multi-layer pole tab and a protective sheet are connected by a rivet before riveting;

FIG6 is a schematic diagram of the structure of the pole body, the multi-layer pole lug and the protection sheet shown in FIG5 after being riveted together by a riveting member;

FIG7 is a schematic structural diagram of a pole body, a multi-layer pole ear and a protection sheet before being connected by stamping according to an embodiment of the utility model;

FIG8 is a schematic diagram of the structure of the pole body, the multi-layer pole ear and the protection sheet shown in FIG7 after being connected by punching;

FIG9 is a schematic diagram of the structure in which the pole body in FIG5 is provided with a liquid injection hole and the protective sheet is provided with a connecting hole;

FIG10 is a schematic diagram of the structure in which the pole body in FIG6 is provided with a liquid injection hole and the protective sheet is provided with a connecting hole;

FIG11 is a schematic diagram of the structure in which the pole body in FIG7 is provided with a liquid injection hole and the protective sheet is provided with a connecting hole;

FIG12 is a schematic diagram of the structure in which the pole body in FIG8 is provided with a liquid injection hole and the protective sheet is provided with a connecting hole;

13 is a schematic diagram of a top view of the structure of a battery according to an embodiment of the utility model when the liquid injection hole is opened on the first pole;

FIG14 is a schematic diagram of a top view of the structure of a battery according to an embodiment of the utility model when the liquid injection hole is provided on the cover plate;

FIG15 is a schematic diagram of the internal structure of a battery in the thickness direction when the cover plate is in a special-shaped structure according to an embodiment of the utility model;

FIG16 is a schematic structural diagram of a third embodiment of the present invention in which a pole body, a multi-layer pole tab and a protection sheet are connected by a rivet after riveting;

FIG. 17 is a schematic diagram of the connection structure of several riveted parts and the protective sheet in FIG. 16 .

Description of reference numerals:

1. Shell; 101. Shell; 102. Cover plate; 2. Battery cell; 201. Pole ear; 3. Pole assembly; 301. Pole body; 3011. First pole; 3012. Second pole; 3013. Rivet hole; 302. Base; 303. Boss; 304. Extension platform; 4. Protective sheet; 401. Connecting hole; 5. Riveted piece; 501. Connecting section; 502. Supporting section; 503. Riveted end; 504. Plug-in column; 505. Fixed end; 6. Stamping deformation zone; 7. Injection hole.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

The following describes an embodiment of the utility model in conjunction with Figures 1 to 15.

According to an embodiment of the utility model, a battery is provided, comprising: a housing 1, a battery cell 2 and a pole assembly 3. The housing 1 has a storage space, and the battery cell 2 is arranged corresponding to the storage space. The battery cell 2 includes a multi-layer pole lug 201, and the pole assembly 3 is arranged on the housing 1. The pole assembly 3 includes a pole body 301, and the pole body 301 is fixed to the multi-layer pole lug 201 by riveting or stamping.

The multi-layer pole ear 201 is fixed to the pole body 301 by riveting or stamping. There is no need to pre-weld the multi-layer pole ear 201, and there is no need to weld the welded pole ear 201 to the adapter plate. The pole body 301 is welded through the adapter plate, which simplifies the connection steps between the multi-layer pole ear 201 and the pole body 301, saves separate pole ear pre-welding equipment and pole ear and adapter plate welding equipment, reduces equipment costs, simplifies the production process, eliminates the adapter plate, simplifies the overall structure of the battery, and does not need to be connected by welding between the multi-layer pole ear 201 and the pole body 301, thereby avoiding the generation of welding slag, ensuring the cleanliness of the inside of the battery cell 2, and avoiding safety hazards.

It is worth noting that, in the related art, a transfer sheet is usually used to transitionally connect the pole ear 201 with the pole body 301. Specifically, the battery cell 2 formed by winding or lamination has multiple layers of pole ears 201, and the multiple layers of pole ears 201 are arranged in layers, that is, each layer of pole ears 201 is in an independent state, and there is no connection between adjacent pole ears 201. Therefore, in the related art, it is necessary to pre-weld the multiple layers of pole ears 201 first, so that the multiple layers of pole ears 201 are connected as one, and then the pole ears 201 connected as one are welded to one side of the transfer sheet, and then the other side of the transfer sheet is welded to the pole body 301. Therefore, in the process of connecting the pole ear 201 with the pole body 301, at least three welding processes are required, resulting in a complex connection process between the pole ear 201 and the pole body 301 and low processing efficiency. In addition, welding slag will be generated during the welding process. If the welding slag enters the interior of the battery cell 2, it will cause safety hazards. Therefore, in order to prevent welding slag from entering the interior of the battery cell 2, additional protective measures need to be taken, such as dust removal during ultrasonic welding or laser welding, adding protective plates, sticking glue on weld marks, and curing weld marks, which further complicates the processing procedures.

In this embodiment, the multilayer pole ear 201 is directly connected to the pole body 301 by a mechanical connection process (riveting or stamping connection), replacing the welding process to avoid the generation of welding slag. Therefore, there is no need to take additional protective measures, so that the production process is simplified, thereby greatly improving production efficiency.

In one embodiment, as shown in FIGS. 1 to 12 , the battery further includes a protective sheet 4, which is disposed on a side of the multi-layered pole tab 201 away from the pole body 301, and the protective sheet 4, together with the multi-layered pole tab 201, is riveted or stamped to the pole body 301. The protective sheet 4 is used to protect the pole tab 201 on the side of the multi-layered pole tab 201 away from the pole body 301, so as to prevent the force from being directly applied to the pole tab 201 during the riveting process or the stamping process, and to prevent the pole tab 201 from being damaged.

In one embodiment, as shown in FIGS. 3 to 6 , the battery further includes a rivet 5, one end of the rivet 5 is connected to the pole body 301, and the other end of the rivet 5 is fixed to the side of the protective sheet 4 away from the pole lug 201. The pole body 301, the multi-layer pole lug 201 and the protective sheet 4 are connected and fixed by the rivet 5, and the connection method is simple and reliable, and the deformation of the pole body 301, the multi-layer pole lug 201 and the protective sheet 4 during the connection process is reduced, thereby ensuring the integrity of the battery.

It is worth noting that, referring to Figures 1 to 6, the pole body 301, the multi-layer pole tab 201 and the protection sheet 4 are stacked along the height direction of the battery, and the pole body 301, the multi-layer pole tab 201 and the protection sheet 4 are fixed in the height direction by setting the rivet 5.

In one embodiment, as shown in Figures 1, 2, 5 and 6, the rivet 5 includes a riveted end 503, a plug-in post 504 and a fixed end 505, the plug-in post 504 is connected between the riveted end 503 and the fixed end 505, the riveted end 503 is riveted into the pole body 301, the plug-in post 504 penetrates the multi-layer pole ear 201 and the protective sheet 4, and the fixed end 505 is fixed to the side of the protective sheet 4 away from the pole ear 201.

It should be noted that, referring to Figures 5 and 6, before riveting, the multi-layer pole ear 201 and the protective sheet 4 are stacked on the lower side of the pole body 301, and the rivet 5 is pressed in by external force so that the upper end of the rivet 5 is riveted into the interior of the pole body 301 to form a riveted end 503, and the lower end of the rivet 5 is pressed and deformed to form a fixed end 505 to fix the protective sheet 4.

As an alternative embodiment, as shown in FIG. 16 , two battery cells 2 are arranged side by side in the thickness direction, and the two pole tabs 201 corresponding to the two battery cells 2 are connected to the same pole body 301. The two pole tabs 201 are arranged at a relative interval, and the pole body 301 is provided with a rivet hole 3013. The plug-in column 504 penetrates the protective sheet 4 and is inserted into the rivet hole 3013 between the two pole tabs 201. Under the action of external force, the end of the plug-in column 504 inserted into the rivet hole 3013 is deformed to form a riveted end 503. Specifically, the rivet member 5 can be a pressure riveted stud, and a threaded hole is opened in the center of the pressure riveted stud. The pressure riveting tool is used to thread the threaded hole. Under the action of the pressure riveting tool, the end of the pressure riveted stud inserted into the rivet hole 3013 is deformed to achieve riveting. It should be further explained that, as shown in FIG. 17 , a plurality of rivet members 5 are arranged at intervals along the width direction of the pole tab 201.

As an alternative embodiment, as shown in Figures 3 and 4, the rivet 5 includes a connecting section 501 and a supporting section 502, the connecting section 501 is connected to the supporting section 502, the connecting section 501 and the supporting section 502 are arranged at an angle so that the rivet 5 forms a bending structure, the connecting section 501 is connected to the pole body 301, and the multi-layer pole ear 201 and the protective sheet 4 are located between the pole body 301 and the supporting section 502.

It should be noted that, please refer to Figure 3, before riveting, the connecting section 501 and the supporting section 502 of the rivet 5 can be arranged in a straight line (of course, they can also be arranged at an obtuse angle of a certain angle, so that the multi-layer pole ear 201 and the protective sheet 4 are stacked on the lower side of the pole body 301); please refer to Figure 4, when riveting, the supporting section 502 is bent so that the supporting section 502 is close to the lower side of the protective sheet 4, and finally fits and connects with the lower side of the protective sheet 4. Therefore, through the bending deformation of the rivet 5, the multi-layer pole ear 201 and the protective sheet 4 are clamped and fixed between the pole body 301 and the supporting section 502.

As an alternative embodiment, as shown in Figures 7 and 8, the pole body 301, the multi-layer pole tab 201 and the protection sheet 4 are simultaneously stamped to form a stamping deformation zone 6, and the pole body 301, the multi-layer pole tab 201 and the protection sheet 4 are connected and arranged in the stamping deformation zone 6. By stamping the pole body 301, the multi-layer pole tab 201 and the protection sheet 4 simultaneously to form the stamping deformation zone 6, the pole body 301, the multi-layer pole tab 201 and the protection sheet 4 are connected in the stamping deformation zone 6, and the connection method is simple and easy to process.

It should be noted that, referring to Figures 7 and 8, before stamping, the multi-layer tabs 201 and the protective sheet 4 are stacked on the lower side of the pole body 301, and stamping is performed downward from the upper side of the pole body 301 to connect the pole body 301, the multi-layer tabs 201 and the protective sheet 4 by stamping.

In one embodiment, as shown in FIG. 1 , FIG. 2 and FIG. 9 to FIG. 15 , the housing 1 and/or the pole body 301 is provided with a liquid injection hole 7 , and the liquid injection hole 7 is communicated with the accommodation space.

It is worth noting that the injection hole 7 can be provided on the shell 1, or on the pole body 301, or on both the shell 1 and the pole body 301. The specific location and number of the holes can be set as required.

In one embodiment, as shown in Figures 1 and 13 to 15, the housing 1 includes a shell 101 and a cover plate 102, the shell 101 has an opening, the cover plate 102 is arranged corresponding to the opening, the shell 101 and the cover plate 102 are enclosed to form a accommodating space, and the pole assembly 3 is arranged corresponding to the shell 101 and/or the cover plate 102.

Specifically, in this embodiment, as shown in FIG. 1 and FIG. 13 , the pole assembly 3 is disposed on the cover plate 102 , and the injection hole 7 is opened on the pole body 301 .

It should be noted that the positive electrode column is an aluminum electrode column, and the injection hole 7 is opened in the positive electrode column, that is, the positive electrode column adopts a hollow structure.

It is worth noting that, referring to FIGS. 9 to 12 , a connecting hole 401 is provided on the protection sheet 4 corresponding to the injection hole 7 . During injection, the electrolyte enters the containing space through the injection hole 7 and the connecting hole 401 .

As an alternative embodiment, as shown in FIG. 14 , the pole assembly 3 is disposed on the cover plate 102 , and the injection hole 7 is also opened on the cover plate 102 .

Of course, in other alternative implementations, the pole assembly 3 may also be disposed on the housing 101 .

In one embodiment, as shown in Fig. 1 and Fig. 13 to Fig. 15, the cover plate 102 and the housing 101 are welded, and the pole assembly 3 and the cover plate 102 are welded, and the welding position of the cover plate 102 and the housing 101 is arranged on the same side as the welding position of the pole assembly 3 and the cover plate 102. The two welding positions are arranged on the same side, and can be carried out successively with one welding device, which reduces the number of welding devices, reduces production costs, facilitates welding, and improves production efficiency.

It should be noted that after the multi-layer pole lug 201 and the protective sheet 4 are riveted or stamped with the pole body 301, they are installed together in the housing 101, and then the cover plate 102 is installed, so that the pole body 301 passes through the cover plate 102, and finally laser welding is performed along the matching gap between the housing 101 and the cover plate 102 to achieve the connection between the housing 101 and the cover plate 102, and laser welding is performed along the matching gap between the cover plate 102 and the pole assembly 3 to achieve the connection between the cover plate 102 and the pole assembly 3. Therefore, the welding between the pole assembly 3 and the cover plate 102 is performed outside the battery, and the welding slag generated during the welding process will not enter the battery, and will not cause safety hazards.

It is worth noting that the cover plate 102 does not include the pole assembly 3 when it is supplied, which can reduce the cost of the cover plate 102 .

It should be noted that, as shown in FIG. 1 , the cover plate 102 may be in the shape of a flat plate; as shown in FIG. 15 , the cover plate 102 may also be in other shapes, such as a regular or irregular shape.

In one embodiment, as shown in FIG. 13 and FIG. 14 , the electrode tab 201 includes a positive electrode tab 201 and a negative electrode tab 201 , the electrode body 301 includes a first electrode 3011 and a second electrode 3012 , the positive electrode tab 201 is connected to the first electrode 3011 , and the negative electrode tab 201 is connected to the second electrode 3012 .

In one embodiment, as shown in FIG. 1 and FIG. 2 , a plurality of cells 2 are arranged side by side in the thickness direction, and the tabs 201 of the same polarity of each cell 2 are arranged correspondingly, and the first pole 3011 and the second pole 3012 are arranged correspondingly to the middle position of the plurality of cells 2 in the thickness direction, and the positive tab 201 of each cell 2 is connected to the first pole 3011, and the negative tab 201 of each cell 2 is connected to the second pole 3012, and the positive tab 201 of each cell 2 is arranged corresponding to the side of the cell 2 close to the first pole 3011, and the negative tab 201 of each cell 2 is arranged corresponding to the side of the cell 2 close to the second pole 3012. When the tabs 201 of a plurality of cells 2 are welded to the same pole, the tabs 201 are extended to the middle position in the thickness direction, shortening the length of the tabs 201, reducing material waste, and reducing production costs.

Specifically, as shown in FIG. 1 and FIG. 2 , two battery cells 2 are arranged side by side in the thickness direction, the positive pole ears 201 of the two battery cells 2 are arranged correspondingly in the thickness direction, the negative pole ears 201 of the two battery cells 2 are arranged correspondingly in the thickness direction, and the first pole 3011 and the second pole 3012 are arranged correspondingly to the docking position of the two battery cells 2, that is, please refer to FIG. 1 and FIG. 13 , the first pole 3011 and the second pole 3012 are arranged at intervals in the width direction (the direction perpendicular to the drawing in FIG. 1 ). Please refer to FIG. 1 , the pole ear 201 of the battery cell 2 on the left is arranged to the right, and the pole ear 201 of the battery cell 2 on the right is arranged to the left, so that the pole ears 201 of the two battery cells 2 are convenient to close to the middle position and shorten the length of the pole ears 201.

It should be noted that, in this embodiment, the tab 201 is arranged near the middle position of the two battery cells 2 along the thickness direction. However, in the related art, the tab 201 is arranged near the two sides of the two battery cells 2 along the thickness direction, and the tab 201 is bent and then connected to the pole body 301 through the adapter. Therefore, the required length of the tab 201 in the related art is relatively long, generally 30mm to 40mm. In this embodiment, the required length of the tab 201 is shortened to 15mm to 25mm, saving materials.

It is worth noting that, referring to FIGS. 1 to 12 , one pole body 301 is connected to the pole ears 201 of two battery cells 2 at the same time, so one pole body 301 is correspondingly provided with two rivets 5 or formed with two stamping deformation areas 6 .

In one embodiment, the pole assembly 3 further includes an insulating member (not shown), which is located between the housing 1 and the pole body 301 .

In one embodiment, as shown in Figures 1 and 15, a pole hole is opened on the shell 1, the pole body 301 passes through the pole hole and extends to the outside of the shell 1, the outer wall of the pole assembly 3 forms a stepped structure, the pole hole is a stepped hole body, and the stepped structure is adapted to the stepped hole body.

Specifically, as shown in Figure 1, the pole assembly 3 includes a base 302, a boss 303 and an extension platform 304 that are connected from bottom to top. The outer diameter of the base 302 is larger than the outer diameter of the boss 303, and the outer diameter of the boss 303 is larger than the outer diameter of the extension platform 304. The hole wall of the pole hole is fitted with the peripheral wall of the base 302, the upper surface of the base 302 and the peripheral wall of the boss 303, and welding is performed at the fitting position of the hole wall of the pole hole and the peripheral wall of the boss 303.

It is understandable that the pole assembly 3 may include a welding ring, through which the welding ring is welded to the hole wall of the pole hole. Further, the welding ring is insulated from the pole body 301 by an insulating member.

When assembling the battery of this embodiment, first, the multi-layer pole tabs 201 of the battery cell 2 are folded and attached to the lower side of the pole body 301, and the protective sheet 4 is attached to the lower side of the pole tab 201; then, the pole body 301, the multi-layer pole tabs 201 and the protective sheet 4 are connected by riveting or stamping; then, the battery cell 2 is installed into the shell 101; finally, the cover plate 102 is installed corresponding to the opening of the shell 101, so that the pole body 301 passes through the pole hole on the cover plate 102, and the cover plate 102 and the shell 101, as well as the cover plate 102 and the pole assembly 3 are welded.

Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims (12)

1. A battery, comprising:

a housing (1) having an accommodation space;

the battery cell (2) is arranged corresponding to the accommodating space, and the battery cell (2) comprises a plurality of layers of lugs (201);

The pole assembly (3) is arranged on the shell (1), the pole assembly (3) comprises a pole body (301), and the pole body (301) is riveted and fixed or connected with the multiple layers of pole lugs (201) in a punching mode.

2. The battery according to claim 1, further comprising a protection sheet (4), wherein the protection sheet (4) is disposed on one side of the multilayer tab (201) facing away from the tab body (301), and the protection sheet (4) and the multilayer tab (201) are riveted or connected with the tab body (301) in a punching manner.

3. The battery according to claim 2, further comprising a rivet (5), wherein one end of the rivet (5) is connected to the pole body (301), and the other end of the rivet (5) is fixed to a face of the protection sheet (4) facing away from the tab (201).

4. A battery according to claim 3, characterized in that the rivet (5) comprises a connecting section (501) and a supporting section (502), the connecting section (501) is connected with the supporting section (502), the connecting section (501) is arranged at an included angle with the supporting section (502) so that the rivet (5) forms a bending structure, the connecting section (501) is connected with the pole body (301), and the plurality of layers of the pole lugs (201) and the protective sheet (4) are arranged between the pole body (301) and the supporting section (502).

5. A battery according to claim 3, characterized in that the rivet (5) comprises a rivet-in end (503), a plug-in post (504) and a fixed end (505), the plug-in post (504) is connected between the rivet-in end (503) and the fixed end (505), the rivet-in end (503) is riveted into the post body (301), the plug-in post (504) penetrates through the protective sheet (4) and corresponds to a plurality of layers of the tabs (201), and the fixed end (505) is fixed on one surface of the protective sheet (4) facing away from the tabs (201).

6. The battery according to claim 2, wherein the tab body (301), the plurality of layers of the tab (201) and the protection sheet (4) are simultaneously punched to form a punched deformation region (6), and the tab body (301), the plurality of layers of the tab (201) and the protection sheet (4) are connected in the punched deformation region (6).

7. The battery according to any one of claims 2 to 6, characterized in that the housing (1) is provided with a liquid filling hole (7), the liquid filling hole (7) being in communication with the accommodation space; and/or the number of the groups of groups,

The pole body (301) is provided with a liquid injection hole (7), the protection sheet (4) is provided with a communication hole (401), and the liquid injection hole (7) is communicated with the accommodating space through the communication hole (401).

8. The battery according to any one of claims 1 to 6, wherein the housing (1) comprises a case (101) and a cover plate (102), the case (101) has an opening, the cover plate (102) is disposed corresponding to the opening, the case (101) and the cover plate (102) enclose to form the accommodation space, and the pole assembly (3) is disposed corresponding to the case (101) and/or the cover plate (102).

9. The battery according to claim 8, wherein the cap plate (102) and the case (101) are provided by welding, the post assembly (3) and the cap plate (102) are provided by welding, and the welding position of the cap plate (102) and the case (101) is provided on the same side as the welding position of the post assembly (3) and the cap plate (102).

10. The battery according to any one of claims 1 to 6, wherein the tab (201) includes a positive tab (201) and a negative tab (201), the tab body (301) includes a first tab (3011) and a second tab (3012), the positive tab (201) is connected to the first tab (3011), and the negative tab (201) is connected to the second tab (3012).

11. The battery according to claim 10, wherein the electric cores (2) are provided with a plurality of electric lugs (201) of the same polarity of each electric core (2) side by side along the thickness direction, the first electrode posts (3011) and the second electrode posts (3012) are provided corresponding to a plurality of electric cores (2) at intermediate positions along the thickness direction, the positive electrode lugs (201) of each electric core (2) are connected with the first electrode posts (3011), the negative electrode lugs (201) of each electric core (2) are connected with the second electrode posts (3012), the positive electrode lugs (201) of each electric core (2) are provided corresponding to one side of the electric core (2) close to the first electrode posts (3011), and the negative electrode lugs (201) of each electric core (2) are provided corresponding to one side of the electric core (2) close to the second electrode posts (3012).

12. The battery according to any one of claims 1 to 6, wherein the pole assembly (3) further comprises an insulation member, which is located between the housing (1) and the pole body (301).