CN218632264U

CN218632264U - Square shell heap integrated into one piece electricity core module

Info

Publication number: CN218632264U
Application number: CN202222893461.9U
Authority: CN
Inventors: 乐俊; 陈念; 赖增岩; 吴志威
Original assignee: Camel Group Wuhan Optics Valley R&d Center Co ltd
Current assignee: Camel Group Wuhan Optics Valley R&d Center Co ltd
Priority date: 2022-10-31
Filing date: 2022-10-31
Publication date: 2023-03-14
Anticipated expiration: 2032-10-31

Abstract

The utility model discloses a square-shell stacked type integrated-forming battery cell module, which comprises a shell, wherein the shell comprises at least two single shells which are stacked, a porous connecting part is arranged between every two single shells, a plurality of single shells and a plurality of connecting parts are integrated-forming structures, a cavity is formed inside each single shell, and the upper end and the lower end of the cavity or one end of the cavity is open; the battery cell monomer is arranged in each cavity; weld in every the top cap of cavity opening part, the inboard surface of top cap with electric core monomer connects, and the outside of top cap is provided with the utmost point post that is used for external output current on the surface. The utility model provides a current electric core module structure heat dissipation poor and influence the technical problem of battery performance.

Description

Square shell heap integrated into one piece electricity core module

Technical Field

The utility model belongs to the technical field of power battery, concretely relates to square shell heap integrated into one piece electricity core module.

Background

In recent years, with the rapid development of new energy automobiles, the market puts higher demands on the cost, the driving mileage and the safety performance of the new energy automobiles. As an energy storage device for providing electric energy for a new energy automobile, the performance of a power battery is a key factor influencing the performance of the new energy automobile, and a battery cell module forming the power battery is a core key point of the battery performance.

In the pack technology of current battery package, electric core module is formed by the equipment of a plurality of monomer electricity core series-parallel connection, welds through laser welding, resistance welding etc. generally between the monomer electricity core, perhaps locks through bolt machinery, has the more troublesome problem of assembly. Although the integrally-formed square laminated lithium battery module disclosed in the chinese patent application with publication number CN112290132a can solve the technical problem of complicated assembly by adopting the integrally-formed aluminum shell structure, the integrally-formed aluminum shell is a closed structure, and thus has the problem of poor heat dissipation of the battery cell, thereby affecting the performance of the power battery. Therefore, the utility model relates to a square shell heap integrated into one piece electricity core module can effectively reduce the part quantity of battery package under the prerequisite of guaranteeing the installation performance to reduce cost by a wide margin.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome above-mentioned technique not enough, provide a square shell heap integrated into one piece electricity core module, solved current electric core module structure heat dissipation poor and influence the technical problem of battery performance.

In order to achieve the technical purpose, the technical solution of the present invention provides a square-shell stacked integrally-formed battery cell module, which includes a housing, wherein the housing includes at least two single housings stacked one on another, a porous connecting member is disposed between every two single housings, the plurality of single housings and the plurality of connecting members are integrally formed, a cavity is formed inside each single housing, and the upper end and the lower end or one end of the cavity is open; the battery cell monomer is arranged in each cavity; the battery cell is welded on the top cover of each cavity opening, the inner side surface of the top cover is connected with the battery cell monomer, and the outer side surface of the top cover is provided with a pole for outputting current outwards.

In a preferred embodiment, the connecting member is a porous bridge, and the porous bridge is composed of holes and bridges arranged in a staggered manner, and two ends of each bridge are connected with the side walls of two adjacent single shells.

In a preferred embodiment, two ends of the bridge are connected to the side walls of the two single housings in an inclined manner.

As a preferred embodiment, the holes are square holes, circular holes, triangular holes or trapezoidal holes.

As a preferred embodiment, a step is provided at the opening of each single shell, and after the inner side surface of each top cover is fitted with the step, the outer side surface of the top cover is flush with the top of the opening of the single shell.

In a preferred embodiment, the outer surface of each single shell is coated with an anticorrosive layer.

As a preferred embodiment, each of the top covers is provided with a pressure relief structure for releasing internal pressure when the internal pressure or temperature of the cell module reaches a threshold value.

In a preferred embodiment, a liquid injection hole for injecting the electrolyte is reserved on each top cover.

As a preferred embodiment, an insulating part is arranged between the pole and the top cover.

As a preferred embodiment, each of the battery cells is formed by winding or stacking a positive electrode sheet and a negative electrode sheet.

Compared with the prior art, the beneficial effects of the utility model mainly include:

the utility model provides a square shell stackable integrated electrical core module, the shell of which comprises at least two stacked single shells and a connecting component assembly for connecting the single shells, and a plurality of single shells and a plurality of connecting components are integrated into a whole, thus the electrical core module does not need to be welded and assembled, and the assembly process is simplified; the connecting parts adopt a porous bridge structure, so that the heat dissipation area of the interior of the cell monomer is increased after heat is conducted to the surface of the porous bridge, the convection heat transfer area is effectively increased, and the problem of heat dissipation of the cell is solved; in addition, the battery cell monomers are arranged in the inner cavity of each single shell, and the battery cell monomers form a parallel battery cell, so that the effect of capacity increase is achieved.

Drawings

Fig. 1 is a schematic view of an overall structure of the battery cell module of the present invention;

fig. 2 is a schematic diagram of an upper surface of the cell module according to the present invention;

FIG. 3 is an enlarged view at A in FIG. 2;

fig. 4 is a schematic structural view illustrating the cell module casing and the top cover according to the present invention;

FIG. 5 is an enlarged view at B in FIG. 4;

fig. 6 is an enlarged view at C in fig. 4.

Shown in the figure:

10-shell, 11-single shell, 12-connecting part, 13-cavity;

20-cell monomer;

30-top cover, 31-pole, 32-pressure relief structure, 33-liquid injection hole and 34-insulating component.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, 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.

As shown in fig. 1, the utility model provides a square-shell stacked integrally-formed battery cell module, which comprises a housing 10, a battery cell single body 20 and a top cover 30, wherein the housing 10 comprises at least two single housings 11 stacked together, a porous connecting component 12 is arranged between every two single housings 11, the single housings 11 and the connecting components 12 are integrally formed, a cavity 13 is formed inside each single housing 11, and the upper end and the lower end or one end of the cavity 13 are open; the cell unit 20 is disposed in each cavity 13; the top cover 30 is welded at the opening of each cavity 13 to seal the single casing 11, the inner side surface of the top cover 30 is connected with the battery cell single body 20, and a pole 31 for outputting current to the outside is arranged on the outer side surface of the top cover 30.

Compared with the prior art, the above technical solution of the present invention is to make the casing 10 into an integrally formed structure, specifically, the plurality of single casings 11 and the plurality of connecting components 12 constituting the casing 10 are made by an integrally forming process, such as an injection molding process, etc., the integrally formed casing 10 only needs to put the cell monomers 20 into the cavity 13 of the casing 10 one by one, and welding assembly is not needed, thereby simplifying the assembling process; and the connecting part 12 for connecting the single shells 11 can increase the heat dissipation area between the single shells 11, thereby solving the technical problem of poor heat dissipation of the conventional battery cell, and in addition, the capacity of the battery cell module is also increased by the plurality of battery cell monomers 20 connected in parallel.

The technical solution of the present invention is described in detail by a specific embodiment.

As shown in fig. 1, the present embodiment relates to a square-shell stacked integrally-formed battery cell module, which includes a casing 10, a battery cell unit 20, and a top cover 30, where the casing 10 is composed of four stacked single casings 11, every two single casings 11 are connected by a porous connecting component 12, the four single casings 11 and three connecting components 12 are integrally formed by an injection molding process, a cavity 13 is formed inside each single casing 11, and an upper end of the cavity 13 is open and a lower end of the cavity 13 is closed; the battery cell unit 20 is disposed in the cavity 13, the top cover 30 is welded to an opening at the top of the cavity 13, the inner side surface of the top cover 30 is connected to the battery cell unit 20, and a pole 31 for outputting current to the outside is disposed on the outer side surface of the top cover 30.

Optionally, in actual use, the number of the cell monomers 20 may be specifically designed according to the size of the capacity of the cell module, that is, the number of the single housings 11 forming the housing 10 is determined.

Optionally, in order to ensure an effective connection between the single housings 11, the single housing 11 is generally configured as a square, and the size of the single housing 11 varies according to the size of the battery cells 20, where the material of the single housing 11 at least includes one of the following materials: copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and the like.

Alternatively, the cavity 13 may be provided with openings at both the upper and lower ends, or only one of the ends is provided with an opening, and correspondingly, each opening is welded with the single shell 11 by using the top cover 30 to obtain a closed cavity 13.

Optionally, the terminal 31 disposed on the top cover 30 includes a positive terminal and a negative terminal, the positive terminal and the negative terminal may be disposed on one top cover 30 or on the top covers 30 at the upper and lower ends of the single casing 11, respectively, and when the positive terminal and the negative terminal are disposed on the same top cover 30, the other end of the single casing 11 does not need to be disposed with a terminal for outputting current.

Specifically, as shown in fig. 2 and 3, the connecting member 12 is a porous bridge, and the housing 10 is formed by connecting a plurality of single housings 11 together through such a porous bridge structure, the porous bridge is formed by alternately arranging holes and bridges, and both ends of the bridge are connected to the side walls of two adjacent single housings 11.

Optionally, both ends of the connecting bridge are connected with the side walls of the two single shells 11 in an inclined manner, so that certain stress buffering can be provided when the cell module expands.

Optionally, the hole is one of a square hole, a circular hole, a triangular hole or a trapezoidal hole, and the hole structure of the porous bridge can be used for enabling heat conduction inside the battery cell to the surface of the porous bridge, so that the heat dissipation area is increased. The material of the porous bridge is the same as that of the single case 11.

It is well known that newton's law of cooling states: when the object is in the natural cooling state, there is temperature difference and the difference in temperature when object surface and surrounding environment are less, and the heat that unit area lost in the unit interval is directly proportional with the temperature difference, and its expression is:

in the formula, q is the heat transfer amount, h is the convective heat transfer coefficient, a is the heat transfer surface area, tw is the solid surface temperature, tf is the fluid temperature, the value of α is related to the temperature difference between the sample and the environment, α =1 can be approximately considered when the temperature difference is small, and α =1 cannot be roughly considered when the temperature difference is too large, otherwise, a large error is generated when the law is applied. As can be seen by newton's cooling equation: when heat radiating area A grow, heat transfer rate will increase, consequently, this porous bridge structure is used to this embodiment, can effectively increase convection heat transfer area, solves the radiating problem of electric core.

Specifically, as shown in fig. 4 and 5, a step is provided at an opening of each single housing 11, so as to support the top cover 30 when the top cover 30 is placed down, and after the inner side surface of each top cover 30 is fitted with the step, the outer side surface of the top cover 30 is flush with the top of the opening of the single housing 11.

Specifically, in order to prevent the housing 10 from being corroded during use, the outer surface of each single housing 11 is usually coated with an anticorrosive layer.

Specifically, as shown in fig. 1, for safety, each of the caps 30 is provided with a pressure relief structure 32 for releasing internal pressure when the internal pressure or temperature of the battery cell module reaches a threshold value, and the pressure relief structure 32 is a rectangular hole formed in the cap 30.

Specifically, as shown in fig. 1, a liquid injection hole 33 for injecting an electrolyte is reserved on each top cover 30, and the liquid injection hole 33 is a circular hole formed in the top cover 30.

Specifically, as shown in fig. 6, an insulating member 34 is disposed between the terminal post 31 and the top cover 30, and plays a role in isolating the electrical connection between the top cover 30 and the terminal post 31.

Specifically, the material of the top cover 30 is not particularly limited, and generally includes at least one of the following materials: copper, iron, aluminum, stainless steel, aluminum alloys, plastics, and the like.

Specifically, each of the battery cell units 20 is formed by winding or stacking a positive plate and a negative plate, and a separator is generally disposed between the positive plate and the negative plate, and the positive plate, the negative plate, and the separator are completely infiltrated by the electrolyte. The portions of the positive and negative plates coated with the active material form the main body of the cell unit 20, and the portions of the positive and negative plates not coated with the active material form the positive and negative tabs, respectively. In the integrated cell structure, the positive electrode tab and the negative electrode tab may be located on the same side of the main body component or located at two ends of the main body component respectively. During the charging and discharging process of the battery, lithium ions are inserted/extracted and inserted/extracted back and forth between the positive electrode and the negative electrode through electrolyte, and the tab connecting electrode is connected with an external load through the pole 31 to form a current loop.

To sum up, the square-shell stacked integrally-formed battery cell module provided by the utility model can accommodate a plurality of battery cell monomers 20 through the integrated shell 10, and the battery cell module does not need to be welded and assembled, thereby simplifying the assembly process; the connecting part 12 adopts a porous bridge structure, so that the heat dissipation area of the interior of the cell monomer 20 is increased after heat is conducted to the surface of the porous bridge, the convection heat transfer area is effectively increased, and the problem of heat dissipation of the cell is solved; in addition, the battery cell single bodies 20 are arranged in the inner cavity of each single shell 11, and the battery cell single bodies 20 form a parallel battery cell, so that the effect of capacity increase is achieved.

The above description is intended to illustrate the embodiments of the present invention, and not to limit the scope of the invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the scope of the claims of the present invention.

Claims

1. The utility model provides a square shell heap integrated into one piece electricity core module which characterized in that includes:

the shell comprises at least two single shells which are stacked, a porous connecting part is arranged between every two single shells, the single shells and the connecting parts are of an integrally formed structure, a cavity is formed in each single shell, and the upper end and the lower end or one end of the cavity are open;

the battery cell monomer is arranged in each cavity;

the battery cell is welded on the top cover of each cavity opening, the inner side surface of the top cover is connected with the battery cell monomer, and the outer side surface of the top cover is provided with a pole for outputting current outwards.

2. The square-shell stacked type integrated battery cell module as claimed in claim 1, wherein the connecting member is a porous bridge, the porous bridge is composed of holes and bridges arranged in a staggered manner, and two ends of each bridge are connected with the side walls of two adjacent single shells.

3. The square-shell stacked type integrated battery cell module as claimed in claim 2, wherein two ends of the connecting bridge are obliquely connected to the side walls of the two single shells.

4. The square-shell stacked type integrated battery cell module as claimed in claim 2, wherein the holes are square holes, circular holes, triangular holes or trapezoidal holes.

5. The square-shell stacked type integrated battery cell module as claimed in claim 1, wherein a step is disposed at the opening of each single shell, and an inner side surface of each top cover is flush with a top of the opening of the single shell after the inner side surface of the top cover is fitted with the step.

6. The square-shell stacked integrally-formed battery cell module as claimed in claim 5, wherein the outer surface of each single shell is coated with an anti-corrosion layer.

7. The square-shell stacked type integrated battery cell module according to claim 1, wherein each of the top covers is provided with a pressure relief structure for releasing internal pressure when the internal pressure or temperature of the battery cell module reaches a threshold value.

8. The square-shell stacked type integrated battery cell module as claimed in claim 1, wherein each top cover is reserved with a liquid injection hole for injecting electrolyte.

9. The square-shell stacked integrally-formed battery cell module as claimed in claim 1, wherein an insulating member is disposed between the terminal post and the top cover.

10. The square-shell stacked type integrated battery cell module as claimed in claim 1, wherein each battery cell is formed by winding or stacking positive plates and negative plates.