CN219979773U - Flat battery - Google Patents

Abstract

The utility model belongs to the technical field of batteries, and discloses a flat battery, which comprises a lower shell provided with an assembly port and a top cover connected to the lower shell and used for sealing the assembly port, wherein the lower shell comprises a side plate, an electrode assembly is arranged on the side plate, and the arrangement of mounting the electrode assembly on the side plate replaces the connection mode of firstly mounting the electrode assembly on the top cover and then welding the top cover on the lower shell in the traditional battery structure. Besides, the flat battery further comprises a pole group arranged in the lower shell and a support piece used for supporting the pole lugs of the pole group, so that the position of the pole lugs is convenient to fix, the influence of shaking of the pole lugs on the use of the battery is avoided, and the stability and safety of the inside of the battery are improved.

Description

Flat battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a flat battery.

Background

Along with the increasing demands of people on battery development, the traditional energy storage battery manufacturing is gradually developed towards the direction of flattening the large capacity and the battery size, so as to achieve the purposes of optimizing the energy density of the battery volume and improving the degree of freedom of equipment manufacturing. The large-capacity flattened battery structure means that the manufacturing difficulty of structural members is greater and greater, the manufacturing cost of single batteries is higher and higher, and the lower shell with thin shell and large sectional area cannot be manufactured by the extrusion-combined drawing process in the traditional manufacturing flow. Therefore, the battery case used in the conventional battery is generally assembled and molded by high-frequency welding, and it is necessary to mount the electrode assembly on the battery top cover and then connect the battery top cover to the lower case by high-frequency welding.

However, the high-frequency welded battery case has high manufacturing cost, and the welded battery case has poor dimensional uniformity, so that the positions of the electrode assemblies are difficult to unify.

Accordingly, there is a need for a flat battery that solves the above-mentioned problems.

Disclosure of Invention

The utility model aims to provide a flat battery, which can avoid the influence of high-frequency welding on the consistency of the battery and can improve the stability and the safety of the inside of the battery.

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

a flat panel battery comprising: the electrode group comprises electrode lugs; the lower shell comprises an installation space for accommodating the pole group, an assembly port is formed in the installation space, and the lower shell comprises a side plate positioned at one side of the assembly port; the top cover is connected to the lower shell and used for sealing the assembly port; an electrode assembly disposed on the side plate; and the supporting piece is arranged in the installation space and is used for supporting the tab.

Preferably, the support member includes an upper support frame and a lower support frame, and the upper support frame and the lower support frame are respectively arranged at the upper side and the lower side of the tab.

Preferably, the electrode assembly includes an inner insulation sheet for insulating the lower case, the inner insulation sheet being disposed at a side of the side plate adjacent to the pole group.

Preferably, the electrode assembly further includes a bus bar provided at a side of the inner insulating sheet near the electrode group, and a first seal provided between the bus bar and the inner insulating sheet.

Preferably, the inner insulating sheet is provided with a clamping piece, the support piece is provided with a clamping groove, and the clamping piece is clamped with the clamping groove.

Preferably, the electrode assembly includes an outer insulation sheet for insulating the lower case, the outer insulation sheet being disposed at a side of the side plate remote from the electrode group.

Preferably, the electrode assembly further includes a tab disposed at a side of the outer insulation sheet remote from the electrode group.

Preferably, the side plate where the electrode assembly is located is further provided with a liquid injection hole, and a second sealing member is arranged in the liquid injection hole.

Preferably, an annular groove allowing the top cover edge to be embedded is arranged on the top surface of the lower shell.

Preferably, the electrode assembly includes a positive electrode assembly and a negative electrode assembly, and the lower case includes a plurality of the side plates; the positive electrode component and the negative electrode component are arranged on the same side plate; alternatively, the positive electrode assembly and the negative electrode assembly are respectively disposed on the two side plates disposed opposite to each other.

The beneficial effects are that:

the flat battery provided by the utility model replaces the traditional battery structure that the electrode assembly is firstly arranged on the top cover and then the top cover is connected with the lower shell through welding, so that the problems of non-uniform size and high leakage risk caused by high-frequency welding can be avoided, the lower shell of the battery is not limited by a connection mode and the size any more, and the degree of freedom in structure and size is improved; meanwhile, the position of the lug can be fixed through the arrangement of the supporting piece, the influence of the lug shaking on the battery in the working process of the flat battery is avoided, and the stability and the safety of the inside of the battery are improved.

Drawings

FIG. 1 is an exploded view of an assembly of two side outlet posts of a flat cell provided by the present utility model;

FIG. 2 is an exploded view of an assembly of a single-sided outlet post of a flat cell provided by the present utility model;

fig. 3 is an exploded view of an assembly of an electrode assembly of a dual-side outlet post of a flat battery and a lower case provided by the present utility model;

fig. 4 is an exploded view of an electrode assembly of a single-side outlet post of a flat battery and an assembly of a lower case according to the present utility model;

fig. 5 is an assembly schematic diagram of an upper support frame, a lower support frame and an electrode assembly of a flat battery provided by the utility model;

fig. 6 is a schematic structural view of an upper support frame of a flat battery according to the present utility model;

fig. 7 is a schematic structural view of a lower support frame of a flat battery according to the present utility model.

In the figure:

1. a top cover; 2. a pole group; 21. a tab;

3. a lower housing; 31. a groove;

4. an electrode assembly; 41. an inner insulating sheet; 411. a clamping piece; 42. an outer insulating sheet; 43. a pole piece; 44. a busbar; 441. a first bus bar; 442. a second bus bar; 443. a flow guiding column; 45. a first seal;

5. an upper support frame; 6. a lower support frame; 7. a liquid injection hole; 8. an explosion-proof valve; 9. and a clamping groove.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

The utility model provides a flat battery which can realize large capacity and flat size of the battery and can ensure the size consistency of the battery.

As shown in fig. 1 to 2, the flat battery includes a lower case 3, a top cover 1, an electrode assembly 4, a pole group 2, and a support member, and in particular, the lower case 3 includes an installation space accommodating the pole group 2, the installation space is provided with an assembly opening, the assembly opening is provided to facilitate assembly and production of the flat battery, and the top cover 1 is connected to the lower case 3 and is used for closing the assembly opening after the assembly of the flat battery is completed. The lower case 3 further includes side plates, typically four in number, on one side of the assembly opening, on which electrode assemblies 4 are provided to satisfy the normal use of the flat battery. The pole group 2 is arranged in the installation space formed by the lower shell 3, the pole group 2 comprises a pole lug 21, and a supporting piece arranged in the installation space is used for supporting the pole lug 21, so that the pole lug 21 is prevented from bending or contacting with the lower shell 3 when shaking, and the use fault of the flat battery is caused.

The flat battery has the advantages that the electrode assembly 4 is mounted on the side plate of the lower shell 3 of the flat battery, the position of the electrode assembly 4 can be directly positioned, the position of the electrode assembly 4 is not influenced when the subsequent welding of the lower shell 3 and the top cover 1 is carried out, and the consistency of the electrode assembly 4 and the lower shell 3 in size and position is ensured. Meanwhile, compared with the existing flat battery structure, the welding position of the flat battery provided by the utility model is also changed, the distance between the welding point and the electrode assembly 4 is prevented from being too close, and the risk of leakage of battery electrolyte in the high-frequency welding process is reduced. In a word, the structure of the flat battery gets rid of the limitation of the traditional welding connection mode, thereby realizing the large capacity of the battery and improving the freedom degree of the battery in structure and size.

It should be noted that, the shape of the lower housing 3 is not specifically defined, and in some embodiments, the lower housing 3 is box-shaped and is composed of a bottom plate and a plurality of sides, and the lower housing 3 is generally manufactured by using a press molding method. In addition, in some embodiments, the pole group 2 may be a soft-package battery cell, in some other specific embodiments, a square battery cell may be selected, and the specific situation may be determined according to the use requirement.

It should be noted that, the electrode assembly 4 includes a positive electrode assembly and a negative electrode assembly, the lower case 3 includes a plurality of side plates, the positive electrode assembly and the negative electrode assembly may be disposed on the same side plate as shown in fig. 2 and fig. 4 to form a flat battery with a single-side electrode outlet post, or the positive electrode assembly and the negative electrode assembly may be disposed on two side plates disposed opposite to each other as shown in fig. 1 and fig. 3 to form a flat battery with a double-side electrode outlet post, and the specific structure may be determined according to the requirement of use.

Further, in order to better fix the position of the tab 21 of the pole group 2, as shown in fig. 6 and 7, the supporting piece further comprises an upper supporting frame 5 and a lower supporting frame 6, the upper supporting frame 5 and the lower supporting frame 6 are respectively arranged on the upper side and the lower side of the tab 21, the lower supporting frame 6 is used for supporting the tab 21, the tab 21 is prevented from bending when the flat battery shakes, the upper supporting frame 5 plays a role in fixing and limiting the tab 21, the tab 21 is clamped by the upper supporting frame 5 and the lower supporting frame 6 and can be isolated, and the situation that the shell is electrified after the tab 21 contacts with the lower shell 3 is avoided.

In some embodiments, the upper support frame 5 and the lower support frame 6 are further provided with a plurality of empty slots, and the empty slots are simple to process, so that the whole weight of the flat battery can be effectively reduced, and the use cost of production can be reduced. It should be noted that, in order to better cover the tab 21 and ensure the insulation characteristic of the battery, the lengths of the upper support frame 5 and the lower support frame 6 are set to be greater than the length of the tab 21, so in some embodiments, the two ends of the upper support frame 5 and the lower support frame 6 are connected and fixed in a clamping manner, so as to ensure the structural stability of the flat battery.

As shown in fig. 3 and 4, the electrode assembly 4 includes an inner insulating sheet 41 for insulating the lower case 3, a bus bar 44 and a first sealing member 45, the inner insulating sheet 41 is disposed at a side of the side plate near the pole group 2, the bus bar 44 is disposed at a side of the inner insulating sheet 41 near the pole group 2, and is composed of a first bus bar 441 and a second bus bar 442 perpendicular to each other, the first bus bar 441 is configured to contact with the tab 21 for conducting electricity, the second bus bar 442 is provided with two guide posts 443 for conducting electricity to the outside, and the first sealing member 45 is disposed between the bus bar 44 and the inner insulating sheet 41. The inner insulating sheet 41 can well isolate the contact between the busbar 44 and the lower case 3, and plays a role of insulation protection. In some embodiments, the inner insulating sheet 41 is a nylon insulating sheet, and in some other embodiments, the inner insulating sheet 41 is a PC insulating sheet. In some embodiments, the first seal 45 is a sealing rubber plug.

In order to realize connection between the inner insulating sheet 41 and the supporting member, as shown in fig. 5, a plurality of clamping members 411 are arranged on the inner insulating sheet 41, as shown in fig. 6 and 7, clamping grooves 9 are arranged on the upper supporting frame 5 and the lower supporting frame 6, part of the clamping members 411 are clamped with the clamping grooves 9 on the upper supporting frame 5, the other part of the clamping members 411 are clamped with the clamping grooves 9 on the lower supporting frame 6, and the positions of the upper supporting frame 5 and the lower supporting frame 6 are fixed by embedding the clamping grooves 9 into the clamping members 411, so that the effect of fixing the supporting lugs 21 is indirectly achieved. Of course, the connection manner of the inner insulating sheet 41 and the supporting member is not limited to the snap connection, and in some other embodiments, the inner insulating sheet 41 and the supporting member may be connected by using a connection member such as a screw.

As shown in fig. 3 and 4, the electrode assembly 4 further includes an outer insulation sheet 42 for insulating the lower case 3, the outer insulation sheet 42 being disposed at a side of the side plate away from the pole group 2, and a pole piece 43 connected to the outer conductor, the pole piece 43 being disposed at a side of the outer insulation sheet 42 away from the pole group 2.

It should be noted that, in some embodiments, mounting holes for connection are formed on the side plate, the inner insulating sheet 41, the outer insulating sheet 42, the first sealing member 45 and the post sheet 43 of the lower case 3, and two flow guiding posts 443 disposed on the bus bar 44 pass through the mounting holes to realize the combination of the electrode assemblies 4, and then are connected to the lower case 3 by riveting or welding technology.

In some other embodiments, the positive electrode tab 43 may be combined with the lower case 3 by riveting or injection molding, so that the positive electrode tab is integral with the lower case 3, and the lower case 3 is positively charged.

Further, in order to make the functions of the flat battery complete and ensure the normal use of the flat battery, a liquid injection hole 7 is further formed in the side plate where the electrode assembly 4 is located, and electrolyte is injected into the flat battery through the liquid injection hole 7. In order to ensure a sealing effect, a second seal (not shown in the figures) is also provided inside the pouring orifice 7. In some embodiments, the second seal may employ a sealing ring, and in some other embodiments, the second seal may also employ a sealing rubber plug.

In order to ensure the safety of the flat battery, an explosion-proof valve 8 is further arranged on the side plate where the electrode assembly 4 is located, when a large amount of gas is generated inside the flat battery, the explosion-proof valve 8 can be opened in time to enable the gas to escape into the atmosphere, so that the internal air pressure of the flat battery is stabilized, the safety of the flat battery is enhanced, and the service life of the flat battery is prolonged.

In order to facilitate the welded connection of the top cover 1 and the lower shell 3, an annular groove 31 allowing the edge of the top cover 1 to be embedded is arranged on the top surface of the lower shell 3, and the top cover 1 is flush with the edge of the lower shell 3 after being embedded, so that subsequent assembly and welding are facilitated.

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

firstly, manufacturing a lower shell 3 by a stamping forming mode, wherein the lower shell 3 forms an installation space for accommodating a pole group 2, an assembly opening is formed in the installation space for assembling and producing a flat battery, an installation hole for being matched with an electrode assembly 4 is formed in a side plate of the lower shell 3, and an electrode assembly 4 is assembled on the side plate of the lower shell 3 by riveting or welding after an inner insulating sheet 41, an outer insulating sheet 42, a first sealing piece 45 and a pole piece 43 are connected in series by two flow guide posts 443 on a bus bar 44; then, the lugs 21 on two sides of the pole group 2 and the bus bars 44 are connected together in a welding mode, the lower support frame 6 and the upper support frame 5 are arranged on two sides of the lugs 21, the clamping piece 411 is clamped into the clamping groove 9, the lower support frame 6 is used for supporting the lugs 21, the lugs 21 are prevented from being bent, and the upper support frame 5 can also play a role in fixing the positions of the lugs 21 and the pole group 2; finally, the top cover 1 is placed in the groove 31 of the lower shell 3, and the top cover 1 and the lower shell 3 are welded together in a laser welding mode, so that the assembly of the flat battery is completed.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. A flat cell, comprising:

the electrode group (2), the electrode group (2) comprises a tab (21);

the lower shell (3), the lower shell (3) comprises an installation space for accommodating the pole group (2), the installation space is provided with an assembly port, and the lower shell (3) comprises a side plate positioned at one side of the assembly port;

the top cover (1) is connected to the lower shell (3) and is used for sealing the assembly port;

an electrode assembly (4), the electrode assembly (4) being disposed on the side plate;

and a support member provided in the installation space and configured to support the tab (21).

2. The flat battery according to claim 1, wherein the support member comprises an upper support frame (5) and a lower support frame (6), and the upper support frame (5) and the lower support frame (6) are respectively disposed on the upper and lower sides of the tab (21).

3. The flat cell of claim 1, wherein the electrode assembly (4) comprises an inner insulating sheet (41) for insulating the lower case (3), the inner insulating sheet (41) being disposed on a side of the side plate close to the electrode group (2).

4. A flat cell according to claim 3, wherein the electrode assembly (4) further comprises a bus bar (44) and a first seal (45), the bus bar (44) being provided on a side of the inner insulating sheet (41) close to the pole group (2), the first seal (45) being provided between the bus bar (44) and the inner insulating sheet (41).

5. A flat battery according to claim 3, characterized in that the inner insulating sheet (41) is provided with a clamping piece (411), the support is provided with a clamping groove (9), and the clamping piece (411) is clamped with the clamping groove.

6. The flat cell of claim 1, wherein the electrode assembly (4) comprises an outer insulating sheet (42) for insulating the lower case (3), the outer insulating sheet (42) being disposed on a side of the side plate remote from the electrode group (2).

7. The flat cell of claim 6, wherein the electrode assembly (4) further comprises a tab (43), the tab (43) being disposed on a side of the outer insulating sheet (42) remote from the pole group (2).

8. The flat cell according to claim 1, wherein the side plate where the electrode assembly (4) is located is further provided with a liquid injection hole (7), and a second sealing member is arranged in the liquid injection hole (7).

9. The flat cell of claim 1, wherein the top surface of the lower case (3) is provided with an annular groove (31) allowing the edge of the top cover (1) to be inserted.

10. The flat panel battery according to any one of claims 1-9, wherein the electrode assembly (4) comprises a positive electrode assembly and a negative electrode assembly, and the lower case (3) comprises a plurality of the side plates;

the positive electrode component and the negative electrode component are arranged on the same side plate;

alternatively, the positive electrode assembly and the negative electrode assembly are respectively disposed on the two side plates disposed opposite to each other.