CN115911772A

CN115911772A - Shell and battery

Info

Publication number: CN115911772A
Application number: CN202211302409.XA
Authority: CN
Inventors: 沈晞; 蒋露霞; 张小兵; 王晶
Original assignee: Shenzhen Maolue Technology Research Co ltd
Current assignee: Shenzhen Maolue Technology Research Co ltd
Priority date: 2022-10-24
Filing date: 2022-10-24
Publication date: 2023-04-04

Abstract

In order to solve the problems that the assembly space of a shell of the existing battery is small and the electrode lugs are easy to insert reversely, the invention provides the shell and the battery, wherein the shell comprises a cover plate and a bottom shell, the bottom shell is of a semi-closed structure with an opening on one surface, and the cover plate closes the opening of the bottom shell so as to form a cavity for accommodating the electrode core between the cover plate and the bottom shell; the bottom shell comprises a bottom plate and enclosing plates, the enclosing plates are connected with the bottom plate to form the cavity, the enclosing plates comprise two end plates and two side plates, the two end plates are arranged at two ends of the bottom plate, the two side plates are arranged at two sides of the bottom plate, and the two end plates are respectively connected with two ends of the side plates; the areas of the side plates and the end plates are respectively smaller than the area of the opening. The opening area of the shell provided by the invention is larger than the area of the side plate or the end plate, so that the assembly space of the shell is increased.

Description

Shell and battery

Technical Field

The invention belongs to the technical field of secondary batteries, and particularly relates to a shell and a battery.

Background

Current lithium ion battery for electric motor car and energy storage is mostly square battery, and this kind of battery is formed by casing and apron combination usually, contains the utmost point core in the airtight cavity of both constituteing behind casing one side opening and the apron welding, and positive negative pole utmost point ear in the utmost point core is through being connected with the utmost point post electricity of predetermineeing on the apron. Generally, the opening surface of the casing is mostly on the side of minimum, and the tab is welded on the utmost point post plane of apron, and the connection area of tab and core usually can be to carrying on bending many times, overwhelming in order to accomodate the space between utmost point core and apron. Under this kind of scheme, because the opening is in the minimum side of casing, follow-up assembly process space is little, and utmost point ear is through buckling many times, overwhelming, has the risk of reverse insertion pole core, causes the potential safety hazard. Meanwhile, the thermal resistance of the battery core to the aluminum shell is large, and the heat dissipation effect is poor.

Disclosure of Invention

The invention provides a shell and a battery, aiming at the problems that the shell of the existing battery is small in assembly space and the electrode lug is easy to insert reversely.

The technical scheme adopted by the invention for solving the technical problems is as follows:

in one aspect, the present invention provides a housing, including a cover plate and a bottom shell, where the bottom shell is a semi-closed structure with an opening on one side, and the cover plate closes the opening of the bottom shell, so that a cavity for accommodating a pole core is formed between the cover plate and the bottom shell; the bottom shell comprises a bottom plate and enclosing plates, the enclosing plates are connected with the bottom plate to form the cavity, the enclosing plates comprise two end plates and two side plates, the two end plates are arranged at two ends of the bottom plate, the two side plates are arranged at two sides of the bottom plate, and the two end plates are respectively connected with two ends of the side plates; the areas of the side plates and the end plates are respectively smaller than the area of the opening.

The opening area of the shell provided by the invention is larger than the area of the side plate or the end plate, the assembly space of the shell is increased, so that the working procedures such as hot pressing and the like can be synchronously carried out in the process of putting the pole core into the cavity, the assembly and processing space is increased, and the situation that the pole lugs are reversely inserted into the pole core is avoided.

Optionally, the side plate or the end plate is close to one end of the opening and is provided with a welding part, the welding part extends from at least one side plate and/or the end plate to a direction far away from the opening, and a tab part of the pole core is welded to the welding part.

Optionally, the weld part is a welding plate, a groove is formed in the welding plate, and the lug part is welded in the groove.

Optionally, the number of the welding plates is one, and the welding plate is arranged at one end of one side plate or one end plate.

Optionally, one end of one of the side plates and one end plate is provided with a welding plate; or one end of the two side plates or the two end plates is provided with the welding plate.

Optionally, an insulating member and a pole are arranged in a groove of one of the welding plates, the pole penetrates through the welding plate, and the insulating member is arranged between the pole and the welding plate;

utmost point ear includes anodal ear and negative pole ear, anodal ear welds in one in the recess of welding plate, negative pole ear with utmost point post electricity is connected.

Optionally, a connecting plate is arranged on the pole, the connecting plate is located in the groove, and the connecting plate is connected with the welding plate in an insulating mode through the insulating part.

In another aspect, the invention further provides a battery, which includes a pole piece and the casing as described above, where the pole piece is disposed in the cavity, the pole piece includes a pole lug portion and a main body portion, the pole lug portion is connected with the main body portion, and the pole lug portion is welded to the welding portion.

Optionally, the tab portion includes a plurality of tabs arranged in a stacked manner, the tab includes a first region, a second region and a third region in sequence along a direction away from the main body portion, and the first regions are arranged at intervals along a first direction; the second area is bent towards the opening direction from one end of the first area, which is far away from the main body part; the third zone is arranged at one end, far away from the first zone, of the second zone, the third zone is arranged in a stacking mode along the first direction, and the third zone is welded to the welding portion.

Optionally, the bending angle between the second region and the first region is from 10 ° to 90 °.

Drawings

Fig. 1 is a schematic structural diagram of a bottom case of a housing according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a bottom case of a housing according to another embodiment of the present invention;

fig. 3 is a schematic structural diagram of a bottom case of a housing according to another embodiment of the present invention;

FIG. 4 is an enlarged view at A in FIG. 3;

FIG. 5 is a schematic structural diagram of a bottom case of a housing according to another embodiment of the present invention at another angle;

fig. 6 is an exploded schematic view of a battery provided in accordance with an embodiment of the present invention;

fig. 7 is a schematic cross-sectional view of a battery according to an embodiment of the present invention.

The reference numbers in the drawings of the specification are as follows:

1. a cover plate;

2. a bottom case; 21. a cavity; 22. a base plate; 23. enclosing plates; 231. an end plate; 232. a side plate; 24. a weld; 241. a groove;

3. a pole core; 31. a lug portion; 311. a first region; 312. a second region; 313. a third zone; 32. a main body portion;

4. an insulating member; 5. a pole column; 51. a connecting plate.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it should be understood that the terms "front", "rear", "vertical", "horizontal", "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on the orientation or positional relationship in which the housing is located. This is done solely for the purpose of facilitating the description of the invention and simplifying the description, and is not intended to indicate or imply that the device or element so referred to must be in a particular orientation, constructed and operated, and therefore should not be taken as limiting the invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" should be interpreted broadly, e.g., as being either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1 to 7, an embodiment of the present invention provides a housing, including a cover plate 1 and a bottom case 2, where the bottom case 2 is a semi-closed structure with an opening on one side, and the cover plate 1 closes the opening of the bottom case 2, so that a cavity 21 for accommodating a pole piece 3 is formed between the cover plate 1 and the bottom case 2. The bottom case 2 includes a bottom plate 22 and a surrounding plate 23, the surrounding plate 23 is connected with the bottom plate 22 to form the cavity 21, the surrounding plate 23 includes two end plates 231 and two side plates 232, two the end plates 231 are disposed at two ends of the bottom plate 22, two the side plates 232 are disposed at two sides of the bottom plate 22, and two the end plates 231 are respectively connected with two ends of the side plates 232. The side plate 232 and the end plate 231 have areas smaller than the area of the opening, respectively.

The opening area of the shell provided by the embodiment is larger than the area of the side plate 232 or the end plate 231, so that the assembly space of the shell is increased, the pole core 3 can synchronously perform hot pressing and other processes in the process of putting the cavity 21 into the shell, the space for assembly and processing is increased, and the situation that the pole lugs are reversely inserted into the pole core 3 is avoided.

Further, an explosion-proof valve and a pole 5 can be arranged at any position of the shell.

As shown in fig. 1 to 4, in an embodiment, a welding portion 24 is disposed at an end of the side plate 232 or the end plate 231 near the opening, the welding portion 24 extends from at least one of the side plate 232 and/or the end plate 231 in a direction away from the opening, and the tab portion 31 of the pole core 3 is welded to the welding portion 24. Through the welding of utmost point ear 31 and weld 24, be convenient for derive the heat in the utmost point core 3 through utmost point ear 31 and weld 24 welded face, realize high-efficient heat dissipation.

As shown in fig. 1 to 5, in an embodiment, the welding portion 24 is a welding plate, the welding plate is provided with a groove 241, and the pole ear portion 31 is welded in the groove 241. Specifically, the length and thickness of the weld plate may be set as desired.

As shown in fig. 1, in one embodiment, the number of the welding plates is one, and the welding plate is disposed at one end of one of the side plates 232 or one of the end plates 231. Specifically, one lug part 31 of the pole core 3 is welded to the welding plate, the other lug part 31 is electrically connected to the pole 5, and the cover plate 1 and the bottom case 2 are respectively connected to the pole 5 in an insulating manner.

In one embodiment, as shown in fig. 2, one end of one of the side plates 232 and one of the end plates 231 is provided with a welded plate. Alternatively, the welding plate is disposed at one end of the two side plates 232 or the two end plates 231.

In one embodiment, as shown in fig. 3-5, an insulating member 4 and a terminal post 5 are disposed in the groove 241 of one of the welding plates, the terminal post 5 penetrates through the welding plate, and the insulating member 4 is disposed between the terminal post 5 and the welding plate.

Utmost point ear 31 includes anodal ear 31 and negative pole ear 31, anodal ear 31 welds in one in the recess 241 of welding plate, negative pole ear 31 with utmost point post 5 electricity is connected.

Further, the surrounding plate 23 is provided with welded plates on three sides or four sides. The positive lug 31 is connected to the welded plate, and the negative lug 31 is connected to the post 5 on the welded plate.

As shown in fig. 2 to 4, in an embodiment, a connecting plate 51 is disposed on the pole 5, the connecting plate 51 is located in the groove 241, and the connecting plate 51 is connected to the welding plate through the insulating member 4 in an insulating manner. Through setting up connecting portion, increase the width of utmost point ear, be convenient for mention the performance of battery.

As shown in fig. 6 and 7, an embodiment of the present invention further provides a battery, which includes a pole piece 3 and the case according to any one of the above embodiments, where the pole piece 3 is disposed in the cavity 21, the pole piece 3 includes a pole lug portion 31 and a main body portion 32, the pole lug portion 31 is connected to the main body portion 32, and the pole lug portion 31 is welded to the welding portion 24.

As shown in fig. 7, in an embodiment, the tab portion 31 includes a plurality of tabs stacked in layers, and the tabs sequentially include a first region 311, a second region 312, and a third region 313 in a direction away from the main body portion 32, and the first region 311 is disposed at intervals along the first direction. The second region 312 is bent in the opening direction from one end of the first region 311 away from the main body portion 32. The third zone 313 is disposed at one end of the second zone 312 far from the first zone 311, the third zone 313 is stacked along the first direction, and the third zone 313 is welded to the welding portion 24. The second district 312 of utmost point ear is bent to the opening direction, and the second district 312 of a plurality of utmost point ears is close to the laminating of open-ended direction each other, and the third district 313 of utmost point ear and the bonding surface of weld part 24 and the binding surface of second district 312 are derived the heat in the utmost point core 3 through utmost point core 3, realize high-efficient heat dissipation.

As shown in fig. 7, in an embodiment, the bending angle between the second region 312 and the first region 311 is 10 ° to 90 °, so as to prevent the reverse insertion of the tab and improve the safety performance of the battery.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A shell is characterized by comprising a cover plate and a bottom shell, wherein the bottom shell is of a semi-closed structure with an opening on one side, and the cover plate closes the opening of the bottom shell so as to form a cavity for accommodating a pole core between the cover plate and the bottom shell; the bottom shell comprises a bottom plate and enclosing plates, the enclosing plates are connected with the bottom plate to form the cavity, the enclosing plates comprise two end plates and two side plates, the two end plates are arranged at two ends of the bottom plate, the two side plates are arranged at two sides of the bottom plate, and the two end plates are respectively connected with two ends of the side plates; the areas of the side plates and the end plates are respectively smaller than the area of the opening.

2. The housing according to claim 1, wherein a welding portion is provided at an end of the side plate or the end plate close to the opening, the welding portion extends from at least one of the side plate and/or the end plate in a direction away from the opening, and a tab portion of the pole core is welded to the welding portion.

3. The housing of claim 2, wherein the weld is a weld plate having a groove disposed therein, and the tab portion is welded in the groove.

4. The housing of claim 3, wherein the number of said weld plates is one, said weld plates being provided at one end of one of said side plates or one of said end plates.

5. The housing of claim 3, wherein one end of one of said side plates and one of said end plates is provided with a welded plate; or one end of the two side plates or the two end plates is provided with the welding plate.

6. The housing of claim 5, wherein an insulating member and a terminal post are disposed in the recess of one of the weld plates, the terminal post penetrates through the weld plate, and the insulating member is disposed between the terminal post and the weld plate;

7. The shell of claim 6, wherein a connecting plate is arranged on the pole, the connecting plate is located in the groove, and the connecting plate is in insulation connection with the welding plate through the insulation piece.

8. A battery comprising a core and the housing of any of claims 2-7, the core disposed within the cavity, the core comprising an ear portion and a body portion, the ear portion connected to the body portion, the ear portion welded to the weld.

9. The battery of claim 8, wherein the tab portion comprises a plurality of tabs arranged in a stacked manner, and the tabs sequentially comprise a first region, a second region and a third region in a direction away from the main body portion, and the first regions are arranged at intervals in the first direction; the second area is bent towards the opening direction from one end of the first area, which is far away from the main body part; the third zone is arranged at one end, far away from the first zone, of the second zone, the third zone is arranged in a stacking mode along the first direction, and the third zone is welded to the welding portion.

10. The cell defined in claim 9, wherein the bend angle between the second region and the first region is from 10 ° to 90 °.