CN210926076U

CN210926076U - Cylindrical battery module

Info

Publication number: CN210926076U
Application number: CN201921187093.8U
Authority: CN
Inventors: 朱维; 谢佳平; 曾群欣; 曾凡帅; 王荔; 王海军; 谭鑫; 鲁江南; 曾琦; 张世民; 陈中梁; 吴钱东
Original assignee: Shanghai Pinetree Power Technology Co ltd
Current assignee: Shanghai Pinetree Power Technology Co ltd
Priority date: 2019-07-26
Filing date: 2019-07-26
Publication date: 2020-07-03
Anticipated expiration: 2029-07-26

Abstract

The utility model relates to a cylindrical battery module, including a plurality of heating modules and a plurality of battery modules of interconnect, heating module sets up between two adjacent battery modules, and each battery module includes battery support and electric core, and the electric core is installed in the battery support, and each heating module includes heating plate and two aluminum sheets, and each aluminum sheet forms the U style of calligraphy through 0 bending, and the symmetry nestification is at the both ends of heating plate; when the heating module is connected with the battery modules, the two aluminum sheets are in direct contact with the battery cores of the battery modules on the two sides. Compared with the prior art, the utility model enables each electric core to be heated evenly, thus improving the heating efficiency; and the overall structure of the battery module is simplified.

Description

Cylindrical battery module

Technical Field

The utility model belongs to the technical field of the battery module technique and specifically relates to a cylindrical battery module is related to.

Background

With the lithium battery becoming the mainstream of the new energy automobile industry, the related thermal management of the lithium battery becomes a key factor for determining the service performance, safety, service life and use cost of the lithium battery.

First, the temperature level of a lithium ion battery directly affects its energy and power performance in use. At a low temperature, the available capacity of the battery rapidly decays, and when the battery is charged at a low temperature (e.g. below 0 ℃), an instantaneous overcharge phenomenon may be caused, which causes internal lithium precipitation, thereby causing internal short circuit of the battery.

In addition, the working or storage temperature of the lithium ion battery influences the service life of the lithium ion battery, scientific research shows that the optimal charging and discharging temperature of the lithium battery used by the electric automobile is between 10 and 30 ℃, the starting power required by the electric automobile in winter is 40 to 70 percent higher than that required by the electric automobile in summer, and in cold regions (such as-20 ℃) in winter, a lithium battery which is well fully charged can only output 40 percent of starting power. In winter, the ambient temperature is reduced, the viscosity of the electrolyte of lithium ions is increased, and the activity of lithium ions in the battery is slowed (the internal resistance is increased), so that the discharge current of the battery is small, and the starting power of the battery is reduced. The battery is charged and discharged in the environment with lower ambient temperature, so that the service life of the battery is greatly reduced, and the power output and the endurance mileage are influenced.

Chinese patent application CN106058112A discloses a cylindrical battery module, in which a heating plate is added to improve the performance of the battery. However, the battery module still maintains the structures of the bus bars, the busbars and the like of the original battery module, so that the overall structure is complex and the heating efficiency is low.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to a cylindrical battery module for overcoming the above-mentioned drawbacks of the prior art.

The purpose of the utility model can be realized through the following technical scheme:

a cylindrical battery module comprises a plurality of heating modules and a plurality of battery modules which are connected with each other, wherein the heating modules are arranged between two adjacent battery modules, each battery module comprises a battery support and an electric core, the electric core is installed in the battery support, each heating module comprises a heating sheet and two aluminum sheets, each aluminum sheet is bent by 0 degree to form a U shape, and the heating sheets are symmetrically nested at two ends of the heating sheet; when the heating module is connected with the battery modules, the two aluminum sheets are in direct contact with the battery cores of the battery modules on the two sides.

Furthermore, each battery module also comprises nickel sheets which are distributed on two sides of the battery module and connected with all the electric cores on the same side of the battery module, and when the heating module is connected with the battery module, the aluminum sheets are tightly attached to the nickel sheets on two sides of the battery module.

Furthermore, the bending radius of the aluminum sheet is the same as the thickness of the aluminum sheet, and the thickness of the heating sheet is twice of the thickness of the aluminum sheet.

Further, the thickness of the aluminum sheet is 0.1-0.5 mm.

Further, the heating plate is a silica gel heating film.

Further, the heating module also comprises a connecting screw rod which penetrates through the battery module and the heating module.

Furthermore, the aluminum sheet on be equipped with first through-hole, the heating film on be equipped with the corresponding second through-hole in position, connecting screw pass first through-hole and second through-hole.

The battery module and the heating module are both arranged in the end cover shell.

Compared with the prior art, the utility model has the advantages of it is following:

1. the utility model designs a heating module, bends the aluminum sheet into the required shape, covers in the heating plate both sides, has guaranteed good heat conductivity through the direct contact of aluminum sheet and electric core, can make every electric core heat evenly through aluminum sheet conduction when the heating plate heats, has improved the efficiency of heating; meanwhile, due to the good conductive characteristic of the aluminum sheet, the aluminum sheet replaces the original bus bar and bus bars to connect the battery membrane group in series, the overall structure of the battery module is simplified, and the effects of saving materials and reducing cost are achieved.

2. Can promote the intensity of heating plate behind the nested aluminum sheet in the both ends of heating plate, can produce the heating module lighter and thinner than current heating plate, the size of whole reduction battery module.

3. The addition of nickel plates at both ends of the battery module can further improve the efficiency of heating and conduction.

4. The bending radius of the aluminum sheet is the same as the thickness of the aluminum sheet, so that the strength of the aluminum sheet can be ensured, and cracking can be prevented.

5. The utility model discloses the easy fixed, a plurality of battery module utilize connecting screw to establish ties together, and at the series process, heating plate and aluminum sheet are filled between the battery module of two series connections, and convenient easy operation need not increase extra fixed knot and construct.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of a battery module.

FIG. 3 is a schematic view of a heating module.

FIG. 4 is a detailed cross-sectional schematic view of a heating module.

Reference numerals: 1. heating module, 11, heating plate, 12, aluminum sheet, 2, battery module, 21, battery support, 22, electric core, 23, nickel piece.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

As shown in fig. 1 to 4, the present embodiment provides a cylindrical battery module including a plurality of heating modules 1 and a plurality of battery modules 2 connected in series with each other, each heating module 1 being disposed between two adjacent battery modules 2. For convenience of expression, the present embodiment provides only a schematic view of the connection of one battery module 2 and one heating module 1.

Each battery module 2 includes a battery holder 21 and a plurality of cylindrical battery cells 22, and the battery cells 22 are mounted in the battery holder 21. The present embodiment employs a typical 55-parallel 2-string module configuration. When viewed from one side of the battery module 2, half of the cells 22 are arranged with their anodes facing upward to form a positive region, and the other half of the cells 22 are arranged with their cathodes facing upward to form a negative region.

Each heating module 1 includes a heating sheet 11 and two aluminum sheets 12. Wherein the heating plate 11 adopts a silica gel heating film, each aluminum sheet 12 is bent by 0 degree to form a U shape, and the aluminum sheets are symmetrically nested at two ends of the heating plate 11. The area of each aluminum sheet 12 needs to cover the positive electrode region or the negative electrode region on the battery module 2. When the heating module 1 is connected with the battery modules 2, one side of one aluminum sheet 12 of the heating module 1 is directly contacted with the positive electrode area of one adjacent battery module 2, and the other side is directly contacted with the negative electrode area of the other adjacent battery module 2; another aluminum sheet 12 of the heating module 1 contacts with the rest of the positive electrode area and the negative electrode area, so that all the battery cells 22 are ensured to contact with the aluminum sheet 12, and the uniform heating of the battery cells 22 is ensured.

The thickness of the aluminum sheet 12 is 0.1-0.5 mm generally, and due to the over-flow requirement of the embodiment, the thickness of the aluminum sheet 12 is 0.3mm, the aluminum sheet 12 compresses the heating sheet 11 through 0-degree bending, and the bending angle needs to be as small as possible; meanwhile, if the bending angle is too small, the bending part of the aluminum sheet 12 will have a risk of cracking, so the bending radius is generally the same as the thickness of the aluminum sheet 12. The clearance of the bent aluminum sheet 12 is 0.6mm, a heating film is placed in the clearance of the aluminum sheet 12, and the thickness of the heating sheet 11 is also selected to be 0.6mm in order to ensure the compression.

The embodiment further comprises a connecting screw, the aluminum sheet 12 is further provided with a first through hole 13, the heating film is provided with a second through hole 14 corresponding to the position, and the connecting screw penetrates through the battery modules 2, the first through hole 13 and the second through hole 14 to enable the aluminum sheet 12 and the heating sheet 11 to be strung between the two battery modules 2.

This embodiment still includes the end cover casing, and battery module 2 and heating module 1 are all installed in the end cover casing.

The utility model discloses in, aluminum sheet 12 has good heat conduction, electric conductive property, and the heat that the heating film produced passes through aluminum sheet 12 even each electricity core 22 of transmitting the cylinder battery. Meanwhile, the two battery modules 2 which need to be connected in series are connected in series through the conductivity of the aluminum sheets 12, so that the overall performance of the battery module is ensured.

In another embodiment, each battery module 2 further includes four nickel sheets 23, each two of the nickel sheets 23 are distributed on two sides of the battery module 2, each nickel sheet 23 is connected to the positive electrode region or the negative electrode region on the same side of the battery module 2, and when the heating module 1 is connected to the battery module 2, the two aluminum sheets 12 are respectively tightly attached to the nickel sheets 23 of the battery modules 2 on two sides. The nickel sheet 23 can further improve the efficiency of heating and conduction of the battery module.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims

1. The cylindrical battery module comprises a plurality of heating modules (1) and a plurality of battery modules (2) which are connected with each other, wherein the heating modules (1) are arranged between two adjacent battery modules (2), each battery module (2) comprises a battery support (21) and an electric core (22), and the electric core (22) is installed in the battery support (21), and the cylindrical battery module is characterized in that each heating module (1) comprises a heating sheet (11) and two aluminum sheets (12), each aluminum sheet (12) is bent by 0 degree to form a U shape, and the aluminum sheets are symmetrically nested at two ends of the heating sheet (11); when the heating module (1) is connected with the battery modules (2), the two aluminum sheets (12) are directly contacted with the battery cores (22) of the battery modules (2) on the two sides.

2. The cylindrical battery module as recited in claim 1, wherein each battery module (2) further comprises nickel sheets (23), the nickel sheets (23) are distributed on two sides of the battery module (2) and connected with all the battery cells (22) on the same side of the battery module (2), and when the heating module (1) is connected with the battery module (2), the aluminum sheets (12) are tightly attached to the nickel sheets (23) on two sides of the battery module (2).

3. The cylindrical battery module according to claim 1, wherein the bending radius of the aluminum sheet (12) is the same as the thickness of the aluminum sheet (12), and the thickness of the heating sheet (11) is twice the thickness of the aluminum sheet (12).

4. The cylindrical battery module according to claim 3, wherein the aluminum sheet (12) has a thickness of 0.1 to 0.5 mm.

5. The cylindrical battery module according to claim 1, wherein the heating sheet (11) is a silicone heating film.

6. The cylindrical battery module according to claim 1, further comprising a connection screw passing through the battery module (2) and the heating module (1).

7. The cylindrical battery module according to claim 6, wherein the aluminum sheet (12) is provided with a first through hole (13), the heating sheet (11) is provided with a second through hole (14) at a corresponding position, and the connecting screw penetrates through the first through hole (13) and the second through hole (14).

8. The cylindrical battery module as claimed in claim 1, further comprising an end cap housing, wherein the battery module (2) and the heating module (1) are mounted in the end cap housing.