CN218385563U

CN218385563U - Battery and battery pack

Info

Publication number: CN218385563U
Application number: CN202222688991.XU
Authority: CN
Inventors: 许久凌; 刘杨; 张璐璐
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2022-10-12
Filing date: 2022-10-12
Publication date: 2023-01-24
Anticipated expiration: 2032-10-12

Abstract

The utility model relates to a battery technology field provides a battery and group battery. The battery includes: the battery shell is provided with a flange structure at the circumferential outer edge and is retracted inwards along a first direction to form a recess at the outer side of the battery shell, and the first direction is parallel to the direction in which the circumferential outer edge of the flange structure is connected with the battery shell towards the flange structure; wherein, the orthographic projection of flange structure and sunken wall along the second direction on battery case at least part coincide mutually, first direction perpendicular to second direction to can be so that sunken formation has realized the withdrawal of accomodating to the flange structure, avoid the too big problem of flange structure protrusion battery case maximum circumference surface size, thereby improve the performance of battery, and can avoid the flange structure to occupy the great space when battery is in groups, thereby improve the space utilization that the battery is in groups.

Description

Battery and battery pack

Technical Field

The utility model relates to a battery technology field especially relates to a battery and group battery.

Background

In the related art, in order to ensure the connection stability of the battery case, the battery case may be formed with a flange, but the flange protrudes out of the battery case, which may affect the grouping of the subsequent batteries.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery and group battery to improve the performance of battery.

According to a first aspect of the present invention, there is provided a battery, comprising:

the battery shell is provided with a flange structure at the circumferential outer edge and is retracted inwards along a first direction to form a recess at the outer side of the battery shell, and the first direction is parallel to the direction in which the circumferential outer edge of the flange structure is connected with the battery shell towards the flange structure;

the flange structure and the wall surface of the recess are at least partially overlapped along the orthographic projection of a second direction on the battery shell, and the first direction is perpendicular to the second direction.

The utility model discloses the battery includes battery case, battery case's circumference outward flange is provided with the flange structure, form the sunken of following the first direction shrink through the outside at battery case, and flange structure and sunken wall coincide along the second direction orthographic projection part at least on battery case mutually, thereby can be so that sunken formation has realized the withdrawal of accomodating to the flange structure, avoid the too big problem of flange structure protrusion battery case maximum circumference surface size, thereby improve the performance of battery, and can avoid the flange structure to occupy the battery great space when in groups, thereby improve the unitized space utilization of battery.

According to a second aspect of the present invention, there is provided a battery pack comprising the above battery.

The utility model discloses the group battery includes the battery, the battery includes battery housing, battery housing's circumference outward flange is provided with the flange structure, form along the sunken of first direction shrink through the outside at battery housing, and flange structure and sunken wall along the at least part coincidence of orthographic projection of second direction on battery housing, thereby can make sunken formation realize the withdrawal of accomodating to the flange structure, avoid the too big problem of the biggest circumference surface dimension of flange structure protrusion battery housing, thereby improve the performance of battery, and can avoid the flange structure to occupy the great space when battery is in groups, thereby improve the unitized space utilization of battery.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may be arranged differently as is known in the art. Further, in the drawings, like reference characters designate the same or similar parts throughout the several views. Wherein:

FIG. 1 is a schematic diagram of a battery shown in accordance with an exemplary embodiment;

FIG. 2 is a schematic diagram of a battery according to another exemplary embodiment;

fig. 3 is a schematic view illustrating the structure of a battery pack according to an exemplary embodiment.

The reference numerals are explained below:

10. a battery case; 11. a flange structure; 12. recessing; 13. a first housing; 14. a second housing; 15. a first surface; 16. a second surface; 20. a battery case; 30. and (5) a connecting structure.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is, therefore, to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, unless explicitly specified or limited otherwise, the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" object or "an" object is also intended to mean one of many such objects possible.

The terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, an electrical connection, or a signal connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood as a specific case by a person skilled in the art.

Further, in the description of the present disclosure, it is to be understood that the directional words "upper", "lower", "inner", "outer", etc., which are described in the exemplary embodiments of the present disclosure, are described at the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present disclosure. It will also be understood that, in this context, when an element or feature is referred to as being "on", "under", or "inner", "outer" with respect to another element(s), it can be directly on "," under ", or" inner "," outer "with respect to the other element(s), or indirectly on", "under", or "inner", "outer" with respect to the other element(s) via intervening elements.

An embodiment of the present invention provides a battery, please refer to fig. 1 and fig. 2, the battery includes: a battery case 10, a circumferential outer surface of the battery case 10 being provided with a flange structure 11, the battery case 10 being inwardly contracted in a first direction parallel to a circumferential outer edge of the flange structure 11 toward a direction in which the flange structure 11 is connected with the battery case 10 to form a recess 12 at an outer side of the battery case 10; wherein, the wall surfaces of the flange structure 11 and the recess 12 at least partially coincide with each other along an orthographic projection of the battery case 10 in a second direction, and the first direction is perpendicular to the second direction.

The utility model discloses a battery of an embodiment includes battery case 10, battery case 10's circumference outward flange is provided with flange structure 11, form along the sunken 12 of first direction shrink through the outside at battery case 10, and flange structure 11 and sunken 12 wall along the orthographic projection of second direction on battery case 10 at least part coincide mutually, thereby can make sunken 12 formation realize the withdrawal of accomodating to flange structure 11, avoid flange structure 11 to protrude the too big problem of battery case 10 maximum circumference surface size, thereby improve the performance of battery, and can avoid flange structure 11 to occupy the great space when battery is in groups, thereby improve the space utilization that the battery is in groups.

It should be noted that, the peripheral outer surface of the battery case 10 is provided with the flange structure 11, the flange structure 11 may be a peripheral closed structure formed around the peripheral outer surface of the battery case 10, or the flange structure 11 may be a non-closed structure formed partially around the peripheral outer surface of the battery case 10, at this time, the flange structure 11 may protrude out of the peripheral outer surface of the battery case 10, and if the flange structure 11 is not processed, the flange structure 11 may occupy a larger space, for example, in a battery grouping process, the flange structure 11 may occupy an inner space of a battery case, thereby affecting the utilization rate of the inner space of the battery case. In the embodiment, the recess 12 contracting in the first direction is formed on the outer side of the battery case 10, and the orthographic projections of the flange structure 11 and the wall surface of the recess 12 on the battery case 10 in the second direction are at least partially overlapped, so that the flange structure 11 can be accommodated and retracted by forming the recess 12, and the internal space of the battery case occupied by the flange structure 11 is reduced.

The orthographic projection of the flange structure 11 and the wall surface of the recess 12 on the battery shell 10 along the second direction at least partially coincide, and in fact, the outer edge of the flange structure 11 does not exceed the maximum outer edge of the battery shell 10 too much, so that the space inside the battery box occupied by the flange structure 11 can be reduced.

The wall surface of the recess 12 is a part of the outer surface of the battery case 10 forming the recess 12, and an orthographic projection of the wall surface of the recess 12 on the battery case 10 along the second direction may also be considered as materializing the recess 12, so that the orthographic projection of the materialized recess 12 on the battery case 10 along the second direction is an orthographic projection of the wall surface of the recess 12 on the battery case 10 along the second direction, for example, assuming that the recess 12 is a rectangular space, in this case, the orthographic projection of the recess 12 on the battery case 10 along the second direction may be a rectangular surface.

Referring to fig. 1 and 2, the first direction is indicated as a, the second direction is indicated as B, and the battery case 10 is contracted inward along the first direction a, and the emphasis is placed on the tendency of the battery case 10 to contract inward along the first direction a, and other problems are not particularly described, and in this case, the structural form of the recess 12 is not limited.

In one embodiment, as shown in fig. 1 and 2, the battery case 10 includes: a first housing 13; a second housing 14, the second housing 14 being connected to the first housing 13; wherein, a flange is arranged on the circumferential edge of at least one of the first shell 13 and the second shell 14 to form the flange structure 11 after the second shell 14 is connected with the first shell 13, so that the first shell 13 and the second shell 14 can be ensured to be reliably connected through the flange structure 11, thereby ensuring the connection stability of the first shell 13 and the second shell 14.

The first housing 13 and the second housing 14 may be welded, i.e. the flange of the first housing 13 and the flange of the second housing 14 may be welded, thereby forming the flange structure 11.

In one embodiment, as shown in fig. 1, the first case 13 is a flat plate, the second case 14 is formed with a recess 12, so that after the first case 13 and the second case 14 are connected, the recess 12 can be formed on the battery case 10, and the flange structure 11 can be accommodated, thereby avoiding the problem of too much protrusion.

In one embodiment, as shown in fig. 2, the first casing 13 has a cavity, the second casing 14 has a cavity, after the first casing 13 and the second casing 14 are connected, a space for accommodating the battery cell may be formed in the first casing 13 and the second casing 14, and a recess 12 may be formed on the first casing 13 and the second casing 14, at this time, the flange of the first casing 13 and the flange of the second casing 14 are connected to form the flange structure 11, and at least a part of the flange structure 11 is located in the recess 12.

In one embodiment, as shown in fig. 1 and 2, the battery case 10 includes two opposite first surfaces 15 and four second surfaces 16 disposed around the first surfaces 15, the recesses 12 being formed at the second surfaces 16; wherein, the area of first surface 15 is greater than the area of second surface 16, not only can guarantee sunken 12 can realize accomodating flange structure 11, and can avoid sunken 12 to occupy too much inner space of battery. When the batteries are grouped, the first surfaces 15 of the adjacent batteries can be oppositely arranged, so that the space utilization rate of the battery grouping is improved, and the energy density of the batteries is ensured.

In one embodiment, as shown in fig. 1, the outer surface of the flange structure 11 is on the same surface as a first surface 15, the flange structure 11 forming the recess 12 with the battery case 10; wherein, the peripheral outer edge of flange structure 11 does not surpass the peripheral outer edge setting of another first surface 15 to can avoid flange structure 11 to surpass the biggest first surface 15 excessive size's problem, with this flange structure 11 influence battery is in groups avoided, thereby improves the space utilization when the battery is in groups.

It should be noted that, referring to fig. 1, the areas of the two first surfaces 15 of the battery case 10 are different, one first surface 15 has a larger area, the other first surface 15 has a smaller area, and the other first surface 15 may be on the same plane with the outer surface of the flange structure 11, in which case, the maximum outer surface formed by the other first surface 15 and the outer surface of the flange structure 11 is not larger than the area of the first surface 15 with the larger area.

In one embodiment, as shown in FIG. 2, the flange structure 11 is located on the second surface 16, the flange structure 11 being located within the recess 12; wherein, the circumference outward flange of flange structure 11 does not surpass the circumference outward flange setting of two first surfaces 15 to can make flange structure 11 accomodate in sunken 12 completely, with this avoid flange structure 11 to influence the battery and become group, thereby improve the space utilization when the battery is in groups.

It should be noted that the two opposite first surfaces 15 are large surfaces of the battery case 10, the four second surfaces 16 are small surfaces of the battery case 10, the four second surfaces 16 include two pairs of small surfaces, that is, a first pair of small surfaces extending along the length direction of the battery case 10, and a second pair of small surfaces extending along the width direction of the battery case 10, and the areas of the first pair of small surfaces are larger than the areas of the second pair of small surfaces, but smaller than the areas of the large surfaces.

In one embodiment, the battery case 10 may be made of stainless steel or aluminum, and has good corrosion resistance and sufficient strength.

In one embodiment, the thickness of the battery case 10 is 0.1mm to 0.5mm, so that the weight of the battery case 10 can be reduced, thereby increasing the energy density of the battery. The thickness of the first housing 13 and the second housing 14 is 0.1mm to 0.5mm.

The thickness of the battery case 10 may be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, or the like.

In one embodiment, the battery further includes a cell disposed within the battery housing 10. The battery further includes a post assembly that may be disposed on the battery housing 10, which may be electrically connected to the electrical core.

It should be noted that the battery can be a laminated battery, which is convenient for grouping and can be processed to obtain a battery with a longer length.

The battery includes a cell and an electrolyte, and is a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The battery cell refers to a unit formed by winding or laminating a stacking portion, wherein the stacking portion comprises a first pole piece, a partition and a second pole piece. And when the first pole piece is a positive pole piece, the second pole piece is a negative pole piece. And the polarities of the first pole piece and the second pole piece can be interchanged.

Specifically, electric core is lamination formula electric core, and electric core has first pole piece that stacks up each other, with first pole piece opposite electric property's second pole piece and the diaphragm of setting between first pole piece and second pole piece to make many to pile up and form lamination formula electric core to first pole piece and second pole piece.

Optionally, the battery may be a wound battery, that is, a first pole piece, a second pole piece opposite to the first pole piece in electrical property, and a diaphragm sheet disposed between the first pole piece and the second pole piece are wound to obtain a wound battery core.

In one embodiment, the battery cell may include a cell main body and two tab portions, the two tab portions may be respectively located at two opposite sides of the cell main body, one tab portion extends from one side surface of the cell main body along a first direction, the other tab portion extends from the other side surface of the cell main body along a second direction, and the first direction is opposite to the second direction. Alternatively, the two tab portions may extend from the same side of the cell body.

The battery core main body comprises more than two pole pieces, the pole lug part comprises more than two single-piece pole lugs, the single-piece pole lugs respectively extend out from the pole pieces corresponding to the single-piece pole lugs, the width of each single-piece pole lug can be smaller than that of each pole piece, and the single-piece pole lugs are stacked to form pole lug parts and are connected with the electrode leading-out structure. Wherein the one-piece tab is made of a metal foil having good electrical and thermal conductivity, such as aluminum, copper, nickel, or the like.

An embodiment of the present invention further provides a battery pack, please refer to fig. 1 to 3, wherein the battery pack includes the above battery.

The utility model discloses a group battery of embodiment includes the battery, the battery includes battery housing 10, battery housing 10's circumference outward flange is provided with flange structure 11, form along the sunken 12 of first direction shrink through the outside at battery housing 10, and flange structure 11 and sunken 12 wall along the orthographic projection of second direction on battery housing 10 at least part coincide mutually, thereby can make sunken 12 form realize the withdrawal of accomodating to flange structure 11, avoid the too big problem of flange structure 11 protrusion battery housing 10 maximum circumference surface size, thereby improve the performance of battery, and can avoid flange structure 11 to occupy the great space when battery is in groups, thereby improve the space utilization that the battery is in groups.

In one embodiment, the battery pack is a battery module or a battery pack.

The battery module includes a plurality of batteries, and the battery module may further include an end plate and a side plate for fixing the plurality of batteries.

It should be noted that a plurality of batteries can be arranged in the battery box after forming the battery module, and the plurality of batteries can be fixed through the end plate and the side plate. A plurality of batteries can directly set up in the battery box, need not to pack a plurality of batteries promptly, and at this moment, can get rid of end plate and curb plate.

In one embodiment, as shown in fig. 3, the battery pack further includes: the battery box 20 is provided with the battery, the flange structure 11 of the battery is arranged opposite to the bottom surface of the battery box 20, so that the flange structure 11 can be used as a support part to be connected with the battery box 20.

In one embodiment, as shown in fig. 3, the battery is connected to the battery case 20 through the connection structure 30, and at least a portion of the connection structure 30 is located in the recess 12, so that the connection stability of the connection structure 30 to the battery can be improved, and after the connection structure 30 is reliably connected to the battery case 20, the battery can be stably fixed to the battery case 20, so as to improve the safety performance of the battery pack.

In one embodiment, the connection structure 30 may be a snap-fit structure, for example, a portion of the connection structure 30 is snap-fit to the battery box body 20, and another portion of the connection structure 30 is snap-fit to the battery box body 20, so as to ensure that the battery is stably fixed to the battery box body 20.

In one embodiment, the connecting structure 30 can be a combination of a clamping structure and a fixing component, for example, the clamping structure of the connecting structure 30 is clamped with the battery, the fixing component of the connecting structure 30 is connected with the battery box 20, and the fixing component can include a fastener, for example, a bolt, a screw or a key.

In one embodiment, the connection structure 30 includes a glue layer, i.e., at least a portion of the glue layer can be located in the recess 12 of the battery to ensure a reliable connection between the glue layer and the battery, and the battery is bonded to the battery case 20 through the glue layer to ensure a reliable fixation of the battery to the battery case 20. The adhesive layer may be an adhesive in the related art, which is used to achieve the fixed connection of the battery and the battery case 20.

In one embodiment, the thermal conductivity of the adhesive layer may be 0.5w/mk to 10w/mk, and on the basis of reliable connection between the battery and the battery case 20 through the adhesive layer, the battery may also be enabled to rapidly transfer heat to the battery case 20 through the adhesive layer, so as to achieve rapid heat transfer of the battery.

The thermal conductivity of the glue layer may be 0.5w/mk, 0.6w/mk, 0.7w/mk, 0.8w/mk, 1w/mk, 1.2w/mk, 1.5w/mk, 1.6w/mk, 1.7w/mk, 1.8w/mk, 2w/mk, 2.2w/mk, 2.5w/mk, 3w/mk, 4w/mk, 5w/mk, 6w/mk, 6.5w/mk, 7w/mk, 8w/mk, 8.5w/mk, 9w/mk, 9.5w/mk, 9.8w/mk, 9.9w/mk, or 10w/mk, and the like.

In one embodiment, the adhesive layer is made of a heat-conducting structural adhesive, and at least a part of the heat-conducting structural adhesive can be located in the recess 12 of the battery, so that reliable connection between the heat-conducting structural adhesive and the battery is ensured, the battery is connected to the battery box body 20 through the heat-conducting structural adhesive, the battery can be reliably fixed to the battery box body 20, heat transfer can be realized through the heat-conducting structural adhesive, reliable heat dissipation of the battery is realized, and safety use performance of the battery is improved.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice in the art to which the disclosure pertains. It is intended that the specification and example embodiments be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A battery, comprising:

a battery case (10), wherein a flange structure (11) is arranged on the circumferential outer edge of the battery case (10), the battery case (10) is contracted inwards along a first direction to form a recess (12) on the outer side of the battery case (10), and the first direction is parallel to the direction in which the circumferential outer edge of the flange structure (11) is connected with the battery case (10) towards the flange structure (11);

wherein the flange structure (11) and the wall surface of the recess (12) at least partially coincide in an orthographic projection of a second direction on the battery case (10), the first direction being perpendicular to the second direction.

2. The battery according to claim 1, wherein the battery case (10) comprises:

a first housing (13);

a second housing (14), the second housing (14) being connected to the first housing (13);

wherein a circumferential edge of at least one of the first housing (13) and the second housing (14) is provided with a flange to form the flange structure (11) upon connection of the second housing (14) with the first housing (13).

3. The battery according to claim 2, wherein the first case (13) is a flat plate, and the second case (14) is formed with the recess (12).

4. The battery according to claim 1, wherein the battery case (10) includes two opposing first surfaces (15) and four second surfaces (16) disposed around the first surfaces (15), the depressions (12) being formed in the second surfaces (16);

wherein the area of the first surface (15) is larger than the area of the second surface (16).

5. The battery according to claim 4, wherein the flange structure (11) is located on the second surface (16), the flange structure (11) being located within the recess (12);

wherein the circumferential outer edge of the flange structure (11) is not arranged beyond the circumferential outer edges of both of the first surfaces (15).

6. The battery according to claim 4, characterized in that the outer surface of the flange structure (11) is on the same surface as one of the first surfaces (15), the flange structure (11) forming the recess (12) with the battery case (10);

wherein the peripheral outer edge of the flange structure (11) is not arranged beyond the peripheral outer edge of the other first surface (15).

7. The battery according to claim 1, wherein the thickness of the battery case (10) is 0.1mm to 0.5mm.

8. A battery pack characterized by comprising the battery according to any one of claims 1 to 7.

9. The battery pack of claim 8, further comprising:

the battery box body (20), the battery sets up in battery box body (20), the flange structure (11) of battery with the relative setting of the bottom surface of battery box body (20).

10. Battery pack according to claim 9, characterized in that the battery is connected to the battery housing (20) by a connecting structure (30), and that at least part of the connecting structure (30) is located in the recess (12).