CN220672709U - Cover plate assembly and battery - Google Patents

Abstract

The utility model discloses a cover plate assembly and a battery, and belongs to the technical field of batteries. The cover plate component comprises a cover plate and an insulating bracket; wherein, the cover plate is integrally formed with a positive pole and a negative pole; the insulating support is arranged at the opening and below the cover plate, a first lug hole and a second lug hole are formed in the insulating support, and positive lugs of each winding core correspondingly penetrate through the first lug holes and are bent and connected with each other to form a positive lug group which is welded with the positive post; the negative electrode lugs of each winding core correspondingly pass through the second electrode lug holes and are bent and connected with each other to form a negative electrode lug group, and the negative electrode lug group is welded with the negative electrode post. The cover plate assembly can improve the occupied volume of the winding core group in the shell, can omit the step of welding the pole on the cover plate, and reduces the cost.

Description

Cover plate assembly and battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a cover plate assembly and a battery.

Background

At present, a lug on a battery cover plate and a lug of a winding core are connected through a switching piece, namely, the lug is welded with the switching piece firstly, and then the switching piece is welded with the lug on the cover plate, so that electric connection between the lug and the lug is realized.

However, because space is required to be provided for bending the switching piece and the tab, the space inside the battery shell is smaller, and the occupied volume of the winding core is reduced; in addition, the current split structure between the pole and the cover plate requires additional welding of the pole to the cover plate, so that the welding step is increased, and the cost of the battery is increased.

In view of the above, a cover assembly and a battery are needed to solve the above problems.

Disclosure of Invention

The first object of the present utility model is to provide a cover assembly, which can increase the occupied volume of a winding core group in a housing, and can omit the step of welding a pole to a cover plate, thereby reducing the cost.

To achieve the purpose, the utility model adopts the following technical scheme:

the cover plate assembly, the cover is located the inside opening part of placing the casing of rolling up the core group, it includes a plurality of rolling up the core to roll up the core, every it has positive pole ear and the negative pole ear that upwards extends to roll up the core, the cover plate assembly includes:

the cover plate is integrally formed with a positive pole and a negative pole;

the insulation support is arranged at the opening and positioned below the cover plate, a first lug hole and a second lug hole are formed in the insulation support, the positive lugs of each winding core correspondingly penetrate through the first lug holes and are bent and connected with each other, so that a positive lug group is formed, and the positive lug group is welded with the positive pole post; the negative electrode lugs of each winding core correspondingly penetrate through the second electrode lug holes and are bent and connected with each other to form a negative electrode lug group, and the negative electrode lug group is welded with the negative electrode post.

Further, the insulating support is clamped to the opening.

Further, the first electrode lug hole comprises a plurality of positive electrode lug holes, the second electrode lug hole comprises a plurality of negative electrode lug holes, the positive electrode lug holes are in one-to-one correspondence with the positive electrode lugs of the winding core group, and the negative electrode lug holes are in one-to-one correspondence with the negative electrode lugs of the winding core group.

Further, a welding protection sheet is respectively arranged between two adjacent positive lug holes and two adjacent negative lug holes, and the positive lug group or the negative lug group is bent and positioned on the welding protection sheet.

Further, each positive electrode tab in the positive electrode tab group is bonded or welded, and/or each negative electrode tab in the negative electrode tab group is bonded or welded.

Further, a reinforcing rib is arranged on the insulating support, which is close to one end face of the winding core, so that a gap is reserved between the winding core group and the insulating support.

Further, the cover plate is provided with a liquid injection hole, and the insulating support is provided with a liquid passing hole matched with the liquid injection hole.

Further, the cover plate is also provided with an explosion-proof valve, and the explosion-proof valve is selectively provided with a protection sheet.

Further, the cover plate is welded to the opening of the housing.

The second object of the present utility model is to provide a battery, which has low cost and can improve the safety performance of the battery.

To achieve the purpose, the utility model adopts the following technical scheme:

a battery comprising a cover assembly as described above.

The beneficial effects of the utility model are as follows:

through the integrated forming of the positive pole and the negative pole on the cover plate, even if the positive pole and the negative pole are integrated with the cover plate, the welding step of welding the positive pole and the negative pole on the cover plate is omitted, and the cost is saved; simultaneously, the positive electrode lugs of each winding core correspondingly pass through the first electrode lug holes and are bent and connected with each other to form positive electrode lug groups, and the positive electrode lug groups are welded with the positive electrode posts; and make the negative pole ear of every book core pass behind the second pole ear hole correspondingly and bend and interconnect to form negative pole ear group, and negative pole ear group and negative pole post welding, thereby realize the lug and the lug between the lug direct connection, no longer need set up the change piece, the lug directly pass insulating support can, saved the space of bending to the setting up space and the lug of change piece in the casing, saved the inner space of casing, with the length that makes the lug is shorter and the occupation volume of book core group in the casing is great.

Drawings

Fig. 1 is a partially exploded view of a battery according to the present utility model;

FIG. 2 is a schematic view of the front surface of an insulating support provided by the utility model;

fig. 3 is a schematic diagram of an assembly structure of a tab provided by the utility model penetrating through an insulating bracket (positive tab is in a penetrating state, and negative tab is in a bending state);

FIG. 4 is a schematic view of an assembled structure between a cover plate and a winding core in the prior art;

FIG. 5 is a schematic view of an assembly structure between a cover plate and a winding core provided by the utility model;

FIG. 6 is a schematic view of the structure of the back side of the insulating support provided by the utility model;

FIG. 7 is a schematic view of a cover plate according to the present utility model;

FIG. 8 is a schematic view of an exploded construction of a cover plate provided by the present utility model;

fig. 9 is a cross-sectional view of a positive electrode post provided by the present utility model.

Reference numerals illustrate:

1-winding core groups; 11-winding cores; 111-positive electrode lugs; 112-negative electrode ear;

2-a housing;

3-cover plate; 31-positive electrode posts; 311-injection molding; 312-conductive metal blocks; 313-sealing ring; 314-welding the ring; 315-welding groove; 32-a negative electrode column; 33-a liquid injection hole; 34-explosion-proof valve; 35-a protective sheet;

4-insulating supports; 41-a liquid passing hole; 42-reinforcing ribs; 43-first pole ear hole; 431-positive ear hole; 44-second pole ear hole; 441-negative ear hole; 45-shielding welding pieces.

Detailed Description

All of the features disclosed in this specification, or all of the steps in a method or process disclosed, may be combined in any combination, except for mutually exclusive features and/or steps.

Any feature disclosed in this specification may be replaced by alternative features serving the same or equivalent purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise. Like reference numerals refer to like elements throughout the specification.

In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the utility model more clear, the technical scheme of the utility model is further described below by a specific embodiment in combination with the attached drawings.

At present, a transfer piece is generally used for connecting a pole post on a battery cover plate and a pole lug of a winding core; however, because space is required to be provided for bending the switching piece and the tab, the space inside the battery shell is smaller, and the occupied volume of the winding core is reduced; in addition, the current split structure between the pole and the cover plate also needs to be welded on the cover plate, so that the welding step is increased, and the cost of the battery is increased.

For this reason, a cover plate assembly and a battery including the same are proposed in the present embodiment; the battery further includes a housing 2 and a winding core set 1, the winding core set 1 is disposed in the housing 2, a cover plate assembly is covered at an opening of the housing 2, and the winding core set 1 includes a plurality of winding cores 11 disposed in parallel, each winding core 11 has a positive tab 111 and a negative tab 112 extending upward. The battery in this embodiment may be a square lithium ion battery.

Specifically, as shown in fig. 1 to 3, the cover plate assembly includes a cover plate 3 and an insulating bracket 4; wherein, the cover plate 3 is integrally formed with a positive pole 31 and a negative pole 32; the insulating bracket 4 is arranged at the opening of the shell 2 and below the cover plate 3, a first lug hole 43 and a second lug hole 44 are arranged on the insulating bracket 4, and the positive lugs 111 of each winding core 11 correspondingly pass through the first lug hole 43 and are bent and connected with each other to form a positive lug group, and the positive lug group is welded with the positive pole column 31; the negative electrode tab 112 of each winding core 11 correspondingly passes through the second electrode tab hole 44 and is bent and connected with each other to form a negative electrode tab set, and the negative electrode tab set is welded with the negative electrode post 32, so that the electric connection between the electrode tabs and the electrode post is realized. In this embodiment, the cover plate 3 and the housing 2 are both made of aluminum.

In this embodiment, compared with the prior art, the positive electrode post 31 and the negative electrode post 32 are integrally formed on the cover plate 3, even if the positive electrode post 31 and the negative electrode post 32 are integrally formed with the cover plate 3, the welding step of welding the positive electrode post 31 and the negative electrode post 32 on the cover plate 3 is omitted, and the welding cost is saved, so that the cost of the whole cover plate assembly can be reduced.

Meanwhile, the positive tab 111 of each winding core 11 correspondingly passes through the first tab hole 43 and is bent and connected with each other to form a positive tab group, and the positive tab group is welded with the positive post 31; the negative electrode lug 112 of each winding core 11 correspondingly passes through the second lug hole 44 and is bent and connected with each other to form a negative electrode lug group, and the negative electrode lug group is welded with the negative electrode post 32, so that the direct connection between the electrode lugs and the electrode post is realized; by adopting the mode, the lug is not required to be arranged any more, and the lug is directly penetrated through the insulating bracket 4, so that the arrangement space of the lug and the bending space of the lug in the shell 2 are saved, the internal space of the shell 2 is saved, the length of the lug is shorter, the consumption of the lug is reduced, and the cost of the cover plate assembly is further reduced; and the occupied volume of the winding core group 1 in the shell 2 can be increased, and the volume specific capacity of the winding core group 1 is increased.

Referring to fig. 4 and 5, it can be seen that, in the battery of the prior art, the tab is welded with the transfer piece of the cover plate 3 on the lower surface of the cover plate 3, the occupied space is large, and the gap between the top end surface of the winding core 11 and the cover plate 3 is about 6mm (as shown in fig. 4); in this application, the use amount of the insulating support 4 is reduced, the battery structure is simplified, and the gap between the top end surface of the winding core 11 and the cover plate 3 is about 1mm (as shown in fig. 5), so that the winding core 11 with larger volume can be accommodated under the condition of the same volume of the shell 2, and the energy density of the battery is improved.

Through bending the tab earlier, weld tab and utmost point post again, need not reserve space for the bending process of tab in casing 2, avoid the tab overlength to insert and arouse the short circuit risk, make the length of tab shorter, the inside space compactness of casing 2 reduces the tab risk of inserting backward, further improves the security of battery.

Further, the insulating support 4 is clamped at the opening, so that the insulating support 4 can be kept relatively fixed, the subsequent welding process between the lug and the pole is stable, and the welding quality can be improved. The insulating support 4 can insulate the winding core group 1 from the cover plate 3, so that the short circuit of the battery is avoided, and the safety of the battery is ensured.

Specifically, as shown in fig. 1 and 2, the first tab hole 43 includes a plurality of positive tab holes 431, the second tab hole 44 includes a plurality of negative tab holes 441, the positive tab holes 431 are disposed in one-to-one correspondence with the positive tabs 111 of the winding core group 1, and the negative tab holes 441 are disposed in one-to-one correspondence with the negative tabs 112 of the winding core group 1. In this embodiment, the winding core set 1 includes two winding cores 11; correspondingly, the positive electrode tab 111 and the negative electrode tab 112 have two, respectively, the positive electrode tab hole 431 and the negative electrode tab hole 441 have two, respectively, one positive electrode tab 111 passes through one positive electrode tab hole 431, and one negative electrode tab 112 passes through one negative electrode tab hole 441.

Further, as shown in fig. 1 to 3, a welding protection sheet 45 is attached to the insulating support 4, and welding protection sheets 45 are respectively disposed between two adjacent positive lug holes 431 and two adjacent negative lug holes 441, and the positive lug group or the negative lug group is bent and located on the welding protection sheet 45; so as to prevent the tab from breaking down when welding between the tab and the post by the shield tab 45, and avoid the problem of battery scrapping caused by breaking circuit between the tab and the winding core 11 of the battery.

Specifically, as shown in fig. 1 and 3, the tab on the winding core 11 passes through the tab hole on the insulating support 4, then the positive tab 111 or the negative tab 112 is bent and attached to the protective welding sheet 45, and each positive tab 111/negative tab 112 is fixed by a welding mode of laser pre-welding or an adhesive mode of attaching an insulating tape; covering the cover plate 3 to the opening of the shell 2, and welding the cover plate 3 and the shell 2 through laser welding; and finally, the pole post and the pole lug are subjected to transmission welding through laser welding.

Wherein, first welding casing 2 and apron 3, just so can fix apron 3 for follow-up utmost point ear is more stable with the welding process of utmost point post, promotes the welding quality between utmost point ear and the utmost point post better. In this embodiment, the bonding manner of the insulating tape is used to fix each positive tab 111 in the positive tab group and/or each negative tab 112 in the negative tab group, so that compared with the prior art in which the ultrasonic welding manner is used, the risk of short circuit caused by tab metal chips generated by the ultrasonic welding can be reduced, and the cost is reduced.

The positive electrode lug group and the negative electrode lug group are formed through pre-fixing, so that the positive electrode lug group and the negative electrode lug group can be attached to the welding protection piece 45 of the insulating bracket 4, and the safety performance of the battery is improved;

it is worth to say that, because the pole post and the cover plate 3 are in an integrated structure, after the pole lug is inserted into the pole lug hole on the insulating bracket 4, the pole lug is conveniently pre-fixed to form a pole lug group; that is, the integrally formed structure between the pole and the cover plate 3 does not affect the tab being firmly attached to the shielding tab 45 on the insulating bracket 4, so as to better improve the safety performance of the battery. In this embodiment, the shielding plate 45 is made of aluminum.

Further, as shown in fig. 6, a reinforcing rib 42 is disposed on the insulating support 4 near an end face of the winding core 11, and the reinforcing rib 42 can leave a gap between the winding core group 1 and the insulating support 4, and the gap can be beneficial to the electrolyte in the casing 2 to infiltrate the winding core 11, so that the performance of the battery is improved; and the reinforcing ribs 42 can also increase the supporting strength of the insulating holder 4. In this embodiment, the reinforcing ribs 42 are specifically provided with four.

Specifically, as shown in fig. 6 and 7, a liquid injection hole 33 for injecting an electrolyte into the case 2 is provided in the cover plate 3; correspondingly, the insulating bracket 4 is provided with a liquid through hole 41 matched with the liquid injection hole 33 so that the electrolyte can be smoothly injected into the shell 2 through the liquid through hole 41.

Further, as shown in fig. 7 and 8, an explosion-proof valve 34 is further provided on the cover plate 3, and a protection sheet 35 is optionally provided on the explosion-proof valve 34; by arranging the explosion-proof valve 34, when the internal pressure of the battery is too high, the internal gas of the battery can be released through the explosion-proof valve 34, so that the safety of the battery is improved, and the possibility of explosion of the battery under the conditions of faults and the like is reduced. The explosion-proof valve 34 may be of an explosion-proof valve structure commonly known in the art.

Specifically, the positive electrode column 31 and the negative electrode column 32 have the same structure; taking the positive electrode 31 as an example, as shown in fig. 9, the positive electrode 31 includes an injection molding 311, a conductive metal block 312, a seal ring 313, and a welding ring 314. Wherein, a welding groove 315 is arranged on the conductive metal block 312 for welding and positioning; the conductive metal block 312 and the injection molding piece 311 are both annular structures, the sealing ring 313 and the conductive metal block 312 are sequentially sleeved on the welding ring 314, and the injection molding piece 311 is sleeved on the conductive metal block 312 and covers part of the surface of the conductive metal block 312. The whole of each pole is in a cap shape, and the middle of each pole is hollow and used for accommodating the pole lug.

The specific assembly process of the battery in this embodiment is as follows:

firstly, winding the laminated positive plate, diaphragm and negative plate by using a winding needle to form winding cores 11, and arranging the two winding cores 11 in parallel in the shell 2; then, the insulating support 4 is clamped at the opening of the shell 2, the positive lug 111 of each winding core 11 correspondingly passes through one positive lug hole 431 on the insulating support 4, and the negative lug 112 of each winding core 11 correspondingly passes through one negative lug hole 441 on the insulating support 4.

Then, bending and bonding the two positive lugs 111 penetrating through the positive lug holes 431 with each other through an insulating adhesive tape to pre-fix the positive lugs 111 to form a positive lug group; bending and bonding two negative electrode lugs 112 penetrating through the negative electrode lug holes 441 with each other through an insulating adhesive tape to pre-fix the negative electrode lugs 112 to form a negative electrode lug group; then, the positive tab group and the negative tab group are respectively bent over the tab 45.

Then, the cover plate 3 is welded at the opening of the casing 2 by laser welding in a transmission manner, the positive electrode lug group and the positive electrode post 31 are welded by laser welding in a transmission manner, and the negative electrode lug group and the negative electrode post 32 are welded by laser welding in a transmission manner, so that the electric connection between the electrode lugs and the electrode posts is completed.

Finally, the electrolyte is injected into the case 2 through the injection hole 33 of the cover plate 3 and the through hole 41 of the insulating holder 4, and the injection hole 33 is sealed after the injection is completed.

The foregoing is merely exemplary of the present utility model, and those skilled in the art should not be considered as limiting the utility model, since modifications may be made in the specific embodiments and application scope of the utility model in light of the teachings of the present utility model.

Claims (10)

1. Cover plate assembly, cover locate the opening part of casing (2) of inside having placed a roll core group (1), roll core group (1) include a plurality of rolls of core (11), every roll of core (11) have positive pole ear (111) and negative pole ear (112) that upwards extend, its characterized in that, cover plate assembly includes:

the battery comprises a cover plate (3), wherein a positive pole (31) and a negative pole (32) are integrally formed on the cover plate (3);

the insulation support (4) is arranged at the opening and positioned below the cover plate (3), a first lug hole (43) and a second lug hole (44) are formed in the insulation support (4), and the positive lugs (111) of each winding core (11) correspondingly penetrate through the first lug hole (43) and are bent and connected with each other to form a positive lug group, and the positive lug group is welded with the positive pole column (31); the negative electrode lugs (112) of each winding core (11) correspondingly penetrate through the second electrode lug holes (44) and are bent and connected with each other to form a negative electrode lug group, and the negative electrode lug group is welded with the negative electrode column (32).

2. Cover plate assembly according to claim 1, wherein the insulating bracket (4) is snapped to the opening.

3. The cover plate assembly according to claim 1, wherein the first pole ear hole (43) comprises a plurality of positive pole ear holes (431), the second pole ear hole (44) comprises a plurality of negative pole ear holes (441), the positive pole ear holes (431) are arranged in one-to-one correspondence with the positive pole ears (111) of the winding core group (1), and the negative pole ear holes (441) are arranged in one-to-one correspondence with the negative pole ears (112) of the winding core group (1).

4. A cover plate assembly according to claim 3, wherein a welding protection sheet (45) is respectively arranged between two adjacent positive lug holes (431) and two adjacent negative lug holes (441), and the positive lug group or the negative lug group is bent and positioned on the welding protection sheet (45).

5. The cap assembly according to any one of claims 1-4, wherein each of the positive tabs (111) of the positive tab set is bonded or welded together and/or each of the negative tabs (112) of the negative tab set is bonded or welded together.

6. A cover assembly according to any one of claims 1-4, wherein a reinforcing rib (42) is provided on the insulating support (4) near an end face of the winding core (11) so as to leave a gap between the winding core group (1) and the insulating support (4).

7. Cover plate assembly according to any one of claims 1-4, wherein the cover plate (3) is provided with a liquid injection hole (33), and the insulating bracket (4) is provided with a liquid passing hole (41) matched with the liquid injection hole (33).

8. A cover plate assembly according to any one of claims 1-4, wherein an explosion-proof valve (34) is further provided on the cover plate (3), and a protective sheet (35) is optionally provided on the explosion-proof valve (34).

9. The cover plate assembly according to any one of claims 1-4, wherein the cover plate (3) is welded to the opening of the housing (2).

10. Battery comprising a cover plate assembly according to any of claims 1-9.