CN219575766U

CN219575766U - Hexagonal prism electric core shell structure, battery pack and vehicle

Info

Publication number: CN219575766U
Application number: CN202320451576.4U
Authority: CN
Inventors: 蒲小雪; 杨少波; 范天驰; 牟丽莎; 李宗华
Original assignee: Deep Blue Automotive Technology Co ltd
Current assignee: Deep Blue Automotive Technology Co ltd
Priority date: 2023-03-10
Filing date: 2023-03-10
Publication date: 2023-08-22
Anticipated expiration: 2033-03-10

Abstract

The utility model relates to a hexagonal prism cell shell structure, which comprises: the battery cell comprises a battery cell shell and a cover plate, wherein the battery cell shell is used for packaging a battery cell body, the cross section of the battery cell shell is a long hexagon, the long hexagon is formed by connecting two long short sides and four long and short sides which are oppositely arranged, the included angle alpha between the short sides and the short sides is 95-115 degrees, the included angle beta between two adjacent short sides is 130-170 degrees, and the ratio of the length of the short sides to the length of the short sides is larger than 1; the battery cell shell is provided with two openings or one opening. The utility model also relates to a battery, a battery pack and a vehicle with the hexagonal-prism cell shell structure. The utility model not only can improve the rigidity of the battery cell shell and reduce the stress of the battery cell shell, but also can improve the space utilization rate.

Description

Hexagonal prism electric core shell structure, battery pack and vehicle

Technical Field

The utility model relates to an automobile power battery, in particular to a hexagonal prism cell shell structure, a battery pack and a vehicle.

Background

The power battery in the market can be divided into square battery, cylindrical battery and soft package battery according to the appearance, and the volume expansion effect (the phenomenon that gas, liquid and solid substances increase with the temperature and the volume increases) of the power battery is closely related to the structure of the battery cell shell. Generally, the expansion of the square battery cell shell is the most serious, and serious swelling phenomenon can occur in the middle area of a larger plane, so that the whole package safety performance is seriously affected. The expansion effect of the cylindrical cell shell is minimal; the square battery core winding core can be a winding type or a lamination type, and the cylindrical battery core can only be a winding core type; the cylindrical battery cell can be designed into various positive and negative electrode position schemes, such as positive and negative electrodes, or a center positive electrode, a surrounding shell negative electrode and the like, and the design position of the square battery cell shell is limited; the space utilization of the cylindrical battery cell shell is low, the maintainability is low, the limiting device can be arranged at the bottom and the top of the cylindrical battery cell shell, polymer glue is filled in the middle gap, and the space arrangement constraint of the square battery cell shell is less, so that the space utilization is high. In general, the positive and negative electrode position schemes of the battery cells are closely related to safety and the like possibly caused by mechanical working conditions such as a temperature regulation system arrangement scheme, leakage risk, whole package bottom scraping and the like. While the design scheme of the honeycomb regular hexagonal prism cell housing is described for a plurality of patents, the basic design scheme is biased to the regular hexagonal prism, the core is the design characteristic of the cylindrical cell housing, and the main starting point is based on the close-packed characteristic of the hexagonal housing. However, how to optimize the main flow square cell shell structure and improve the shell defect of the square cell is still a significant matter.

CN 214254550U discloses a battery and a battery module, wherein the battery comprises a cell, a housing, a positive pole piece and a negative pole piece. The battery cell is positive pole piece, positive pole piece and diaphragm winding positive hexagonal prism structure that forms, in positive hexagonal prism structure's extending direction, positive pole piece surpasses the part of diaphragm and forms the positive pole and all takes the utmost point ear, the negative pole piece surpasses the part of diaphragm and forms the negative pole and all takes the utmost point ear, the casing is both ends open-ended hollow positive hexagonal prism structure, the battery cell wears to locate in the casing, the one end of casing is located to positive pole piece lid, and positive pole piece can be electrically connected in the positive pole and all take the utmost point ear, the other end of casing is located to negative pole piece lid, and the negative pole piece can be electrically connected in the negative pole and all take the utmost point ear. The casing adopts regular hexagonal prism structure, can reduce the casing wall thickness under the prerequisite of guaranteeing battery structural strength, lightens battery quality, improves the energy density of battery. The utility model also provides a battery module, which comprises the battery and has higher structural strength and energy density.

The technical solutions disclosed in the above patent documents are, of course, not lost as one of the beneficial attempts in the art.

Disclosure of Invention

The utility model aims to provide a hexagonal prism cell shell structure, which optimizes a main flow square cell shell structure based on the close-packed characteristic of hexagonal cell shells and improves the shell defects of square cells.

A first aspect of the present utility model provides a hexagonal-prism-shaped cell housing structure, comprising: the battery cell comprises a battery cell shell and a cover plate, wherein the battery cell shell is used for packaging a battery cell body, the cross section of the battery cell shell is a long hexagon, the long hexagon is formed by connecting two long short sides and four long and short sides which are oppositely arranged, the included angle alpha between the short sides and the short sides is 95-115 degrees, the included angle beta between two adjacent short sides is 130-170 degrees, and the ratio of the length of the short sides to the length of the short sides is larger than 1; the battery cell shell is provided with two openings or one opening.

Further, the height H1 of the cell housing is between 40mm and 160 mm.

Further, the battery cell shell is made of polymer plastics, aluminum alloy and stainless steel.

In a second aspect of the utility model, a battery is provided, comprising a battery body, a battery core body, a positive electrode full tab, a negative electrode full tab, a positive electrode terminal, a negative electrode terminal, a pressure release valve and the structure of the hexagonal prism battery core shell;

the battery cell body is formed by alternately winding or stacking a positive pole piece, a negative pole piece and a diaphragm; the positive electrode full lug is formed by the part of the positive electrode plate, which exceeds the diaphragm; the negative electrode full tab is formed by the part of the negative electrode plate, which exceeds the diaphragm.

Further, a plurality of positive electrode full lugs are arranged on one side of the positive electrode plate, a plurality of negative electrode full lugs are arranged on one side of the negative electrode plate, a positive electrode lug group is formed by the positive electrode full lugs, and a negative electrode lug group is formed by the negative electrode full lugs.

Further, when the battery cell shell is provided with an opening at one end, the positive electrode terminal and the negative electrode terminal are arranged on the surface of the upper cover plate, and the pressure release valve is arranged in the middle of the positive electrode terminal and the negative electrode terminal, so that the design not only can ensure that the battery cell body is arranged in the whole bag to be advantageous, but also has certain installation guarantee when the battery cell body is scratched, and the process is simpler; when the cell shell is provided with two openings at two ends, the battery comprises an upper cover plate and a lower cover plate, the positive terminal and the negative terminal are respectively arranged on the surfaces of the upper cover plate and the lower cover plate, and the positions of the pressure release valves are variable.

Further, the positive electrode full tab group and the negative electrode full tab group are respectively connected with the positive electrode terminal and the negative electrode terminal in a welding, gluing or hot pressing mode.

Further, the positive electrode terminal is made of aluminum, and the negative electrode terminal is made of copper.

In a third aspect of the utility model, there is provided a battery pack comprising a plurality of batteries as described above.

In a fourth aspect of the utility model, there is provided a vehicle comprising a battery pack as described above.

The utility model has the following advantages that the battery cell shell is designed into a long hexagon shape in cross section, so that:

1. the middle parts of the front surface and the rear surface of the battery cell shell are respectively provided with a bending part, which is equivalent to that of the front surface and the rear surface, and a reinforcing rib is respectively added, thereby being beneficial to improving the strength of the whole plane. In addition, the newly added space of the bending part can also be used as a deformation space of the battery cell body in the shell, so that the rigidity of the shell is improved, and the stress of the shell is reduced;

2. the cell structure can also improve the space utilization rate.

Drawings

FIG. 1 is a block diagram of a cell housing of the present utility model;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a schematic illustration of a wound core disposed in a cell housing;

FIG. 4 is a schematic illustration of a laminated core disposed in a cell housing;

fig. 5 is a schematic view showing a close-packed space of battery bodies;

FIG. 6 is a block diagram of one embodiment of the present utility model;

fig. 7 is a block diagram of another embodiment of the present utility model.

In the figure (technical features indicated by the marks):

1-battery body, 11-battery core body, 12-positive electrode full tab, 13-negative electrode full tab, 14-positive electrode terminal, 15-negative electrode terminal, 16-battery core shell, 17-upper cover plate, 18-lower cover plate, 19-relief valve, 20-short side, 21-hypotenuse, 111-winding type winding core and 112-lamination type winding core.

Detailed Description

Further advantages and effects of the present utility model will become readily apparent to those skilled in the art from the disclosure herein, by referring to the following description of the embodiments of the present utility model with reference to the accompanying drawings and preferred examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be understood that the preferred embodiments are presented by way of illustration only and not by way of limitation.

Referring to fig. 1 to 2, in this embodiment, a hexagonal-prism-shaped cell housing structure includes: the battery cell comprises a battery cell shell 16 and a cover plate, wherein the battery cell shell 16 is used for packaging a battery cell body 11, the cross section of the battery cell shell 16 is a long hexagon, the long hexagon is formed by connecting two long and short sides 20 which are arranged oppositely and four long and short sides 21, an included angle alpha between the short sides 20 and the long and short sides 21 is 95-115 degrees, an included angle beta between two adjacent long sides 21 is 130-170 degrees, and the ratio of the length of the short sides 20 to the length of the long sides 21 is larger than 1; the cell housing 16 is open at both ends or open at one end. With continued reference to fig. 1, compared with a conventional regular hexagonal prism cell casing, on the one hand, the middle parts of the front and rear sides of the hexagonal prism cell casing 16 are respectively provided with a bending part, which is equivalent to that a reinforcing rib is respectively added on the front and rear sides, so that the strength of the whole plane strength is improved. In addition, the newly increased space of the bending part can also be used as a deformation space of the battery cell body 11 in the shell, so that the rigidity of the battery cell shell is improved, and the stress of the battery cell shell is reduced.

In this embodiment, the height H1 of the cell housing 16 is between 40mm and 160 mm. The specific dimensions can be designed according to actual needs.

In this embodiment, the cell housing 16 is made of polymer plastics, aluminum alloy, or stainless steel.

Referring to fig. 3 to 5, in this embodiment, the battery core housing 16 is internally provided with one or more winding cores 111 and a lamination winding core 112, the winding cores 111 are formed by alternately winding positive pole pieces, negative pole pieces and diaphragms, and the lamination winding cores 112 are formed by stacking the positive pole pieces, the negative pole pieces and the diaphragms. With continued reference to fig. 5, it can be seen that the space utilization of such a hexagonal-prism cell housing 16 is high.

Referring to fig. 6 to 7, in the present embodiment, a battery including a battery body 1 includes: the battery cell body 11, the positive electrode full tab 12, the negative electrode full tab 13, the positive electrode terminal 14, the negative electrode terminal 15, the pressure release valve 19 and the hexagonal prism battery cell shell structure are formed; the battery cell body 11 is formed by alternately winding or stacking a positive pole piece, a negative pole piece and a diaphragm; the positive electrode full lug 12 is formed by the part of the positive electrode piece exceeding the diaphragm; the negative electrode full tab 13 is formed by the part of the negative electrode plate, which exceeds the diaphragm. The positive electrode sheet is formed by uniformly coating a mixture of a positive electrode active substance, a binder, a conductive agent and the like on a film material, wherein the film material can be a film material of a three-dimensional conductive network formed by metal foil materials such as aluminum foil, multi-layer composite foil materials formed by metal aluminum and polymers or polymer modified materials, aluminum wires, aluminum nets or other conductive metal fibers. The negative electrode plate is formed by uniformly coating a mixture of a negative electrode active substance, a binder, a conductive agent and the like on a film material, wherein the film material can be a film material of a three-dimensional conductive network formed by metal foil materials such as copper foil, multi-layer composite foil materials formed by metal copper and polymer or polymer modified materials, copper wires, copper nets or other conductive fibers.

With continued reference to fig. 6, in this embodiment, a plurality of positive full tabs 12 are disposed on one side of the positive electrode plate, a plurality of negative full tabs 13 are disposed on one side of the negative electrode plate, the positive full tabs 12 form a positive tab group, and the negative full tabs 13 form a negative tab group.

When the battery cell casing 16 is provided with an opening at one end, the positive electrode terminal 14 and the negative electrode terminal 15 are arranged on the surface of the upper cover plate 17, and the pressure release valve 19 is arranged in the middle of the positive electrode terminal 14 and the negative electrode terminal 15; when the cell case 16 is designed to be open at one end, the positive terminal 14, the negative terminal 15, and the pressure release valve 19 may be provided at the end where they are open. The design not only can make the electric core body 11 arrange in whole package to have an advantage like this, will have certain installation guarantee when touching and snagging, and the technology is also simpler. The number of the relief valves 19 is not limited, and may be two or more, and may be designed according to practical circumstances. The relief valve 19 is designed in the middle because the pressure in the middle is generally large when there is gas convergence, so the position of the relief valve 19 is generally designed in the middle of the positive terminal 14 and the negative terminal 15.

With continued reference to fig. 7, in this embodiment, when the cell housing 16 is open at both ends, the battery includes an upper cover 17 and a lower cover 18. The position designs of the positive electrode terminal 14 and the negative electrode terminal 15 are not limited as long as they are provided on the surfaces of the upper cap plate 17 and the lower cap plate 18 opposite to each other. Similarly, the position of the relief valve 19 is not limited, and is designed according to practical situations.

In this embodiment, the positive electrode full tab group and the negative electrode full tab group are respectively connected with the positive electrode terminal 14 and the negative electrode terminal 15 by welding, gluing or hot pressing. The positive electrode terminal 14 is made of aluminum, and the negative electrode terminal 15 is made of copper.

The battery pack comprises a plurality of batteries as described above.

The utility model relates to a vehicle provided with a battery pack as described above.

The above embodiments are merely preferred embodiments for fully explaining the present utility model, and the scope of the present utility model is not limited thereto. Equivalent substitutions and modifications will occur to those skilled in the art based on the present utility model, and are intended to be within the scope of the present utility model.

Claims

1. A hexagonal prism cell housing structure, comprising: the battery cell comprises a battery cell shell (16) and a cover plate, wherein the battery cell shell (16) is used for packaging a battery cell body (11), the cross section of the battery cell shell (16) is a long hexagon, the long hexagon is formed by connecting two long and short sides (20) which are oppositely arranged and four long and short sides (21), an included angle alpha between the short sides (20) and the short sides (21) is 95-115 degrees, an included angle beta between two adjacent short sides (21) is 130-170 degrees, and the ratio of the length of the short sides (20) to the length of the short sides (21) is larger than 1; the cell housing (16) is open at both ends or open at one end.

2. The hexagonal-prism cell housing structure according to claim 1, characterized in that the height H1 of the cell housing (16) is between 40mm and 160 mm.

3. The hexagonal-prism-shaped cell housing structure according to claim 2, wherein the cell housing (16) is made of polymer plastic, aluminum alloy or stainless steel.

4. A battery comprising a battery body (1), characterized by comprising: a cell body (11), a positive full tab (12), a negative full tab (13), a positive terminal (14), a negative terminal (15), a pressure release valve (19) and the hexagonal-prism cell housing structure according to any one of claims 1-3;

the battery cell body (11) is formed by alternately winding or stacking a positive pole piece, a negative pole piece and a diaphragm;

the positive electrode full lug (12) is formed by the part of the positive electrode plate, which exceeds the diaphragm;

the negative electrode full tab (13) is formed by the part of the negative electrode plate, which exceeds the diaphragm.

5. The battery according to claim 4, wherein a plurality of positive electrode full tabs (12) are provided on one side of the positive electrode sheet, a plurality of negative electrode full tabs (13) are provided on one side of the negative electrode sheet, a plurality of positive electrode full tabs (12) constitute a positive electrode tab group, and a plurality of negative electrode full tabs (13) constitute a negative electrode tab group.

6. The battery according to claim 4, wherein when the cell case (16) is open at one end, the positive electrode terminal (14) and the negative electrode terminal (15) are provided on the surface of the upper cover plate (17), and the pressure release valve (19) is provided in the middle of the positive electrode terminal (14) and the negative electrode terminal (15); when the cell shell (16) is provided with openings at two ends, the battery comprises an upper cover plate (17) and a lower cover plate (18), and the positive electrode terminal (14) and the negative electrode terminal (15) are respectively arranged on the surfaces of the upper cover plate (17) and the lower cover plate (18).

7. The battery according to claim 4, wherein the positive electrode full tab group and the negative electrode full tab group are respectively connected with the positive electrode terminal (14) and the negative electrode terminal (15) by welding, gluing or hot pressing.

8. The battery according to claim 7, wherein the positive electrode terminal (14) is an aluminum material and the negative electrode terminal (15) is a copper material.

9. A battery pack comprising the plurality of batteries of claim 8.

10. A vehicle, characterized in that the vehicle is provided with the battery pack according to claim 9.