CN219534830U

CN219534830U - Internal insulation structure of lithium ion power battery

Info

Publication number: CN219534830U
Application number: CN202320492286.4U
Authority: CN
Inventors: 赵阳
Original assignee: Datu Argo Energy Technology Nantong Co ltd
Current assignee: Datu Argo Energy Technology Nantong Co ltd
Priority date: 2023-03-15
Filing date: 2023-03-15
Publication date: 2023-08-15
Anticipated expiration: 2033-03-15

Abstract

The utility model provides an internal insulation structure of a lithium ion power battery, which relates to the field of lithium ion power batteries and comprises the following components: the power battery comprises a power battery shell, wherein an anode battery pack and a cathode battery pack are arranged in the power battery shell, an insulating partition plate is fixed in the power battery shell in a sealing manner, three groups of heat absorption columns are fixed on the inner side of the insulating partition plate, and a first cooling pipe and a second cooling pipe are wrapped in the heat absorption columns; and the second cooling pipes are symmetrically distributed on the front side and the rear side of the first cooling pipe, and radiating fins are embedded and fixed on the lower end face of the insulating partition plate. The utility model solves the problems of poor heat conduction and heat dissipation performance of the insulating layer caused by the fact that the insulating sheet is positioned between the battery packs of the lithium ion power batteries in the prior art, so that the heat of the battery packs is easily gathered to the insulating sheet.

Description

Internal insulation structure of lithium ion power battery

Technical Field

The utility model relates to the field of lithium ion power batteries, in particular to an internal insulation structure of a lithium ion power battery.

Background

The cathode of the lithium ion power battery is made of graphite and other materials, the anode is made of lithium iron phosphate, lithium cobalt oxide, lithium titanate and the like, and the lithium ion power battery has the advantages of high energy, high battery voltage, wide working temperature range, long storage life and the like, and through searching, the prior art (application number: 202120183949.5) describes that an insulating sheet 2 comprises a heat dissipation substrate layer 201, the surface of the heat dissipation substrate layer 201 is coated with an insulating layer 202, the surface of the insulating layer 202 is coated with a heat conducting silica gel layer 203, the heat dissipation substrate layer 201 is made of polypropylene materials, the surface of the heat dissipation substrate layer 201 is coated with insulating paint, the heat dissipation substrate layer 201 made of polypropylene materials is coated with insulating paint,

however, in the prior art, the insulating sheets are arranged between the battery packs of the lithium ion power battery, so that heat of the battery packs is easily gathered to the insulating sheets, and the problem of poor heat conduction and heat dissipation performance of the insulating layers is caused.

Disclosure of Invention

In order to overcome the defects existing in the prior art, an internal insulation structure of a lithium ion power battery is provided, so that the problems that heat of a battery pack is easily accumulated to the insulation sheet and poor heat conduction and heat dissipation performance of an insulation layer are caused due to the fact that the insulation sheet is positioned between battery packs of the lithium ion power battery in the prior art are solved.

To achieve the above object, there is provided an internal insulation structure of a lithium ion power battery, comprising: a power battery shell, wherein an anode battery pack and a cathode battery pack are arranged in the power battery shell,

an insulating partition plate is fixed in the power battery shell in a sealing way, three groups of heat absorption columns are fixed on the inner side of the insulating partition plate, and a first cooling pipe and a second cooling pipe are wrapped in the heat absorption columns; and the second cooling pipes are symmetrically distributed on the front side and the rear side of the first cooling pipe, and radiating fins are embedded and fixed on the lower end face of the insulating partition plate.

Further, an insulating separator is attached between the positive electrode battery pack and the negative electrode battery pack; the positive battery pack is made of lithium iron phosphate material; the negative electrode battery pack is made of conductive graphite material.

Further, a liquid filling port is formed in the surface of the upper end of the insulating partition plate; and the lower end of the liquid filling port is communicated with the upper port of the first cooling pipe, and a sealing plug is fixed in the liquid filling port in a sealing way.

Further, two groups of lugs are arranged at the upper end of the power battery shell; and the two groups of lugs are respectively connected with the positive electrode battery pack and the negative electrode battery pack.

Further, the side face of the insulating partition plate is connected with the heat absorption column through the insulating diaphragm, an outer insulating layer is arranged on the outer surface of the heat absorption column, and a heat conducting layer is wrapped inside the outer insulating layer.

Further, the first cooling pipe and the second cooling pipe are internally filled with refrigerant; and the outer surfaces of the walls of the first cooling pipe and the second cooling pipe are wrapped with heat conducting layers.

Further, the lower end of the first cooling pipe is communicated with the second cooling pipe; and the communication part of the lower ends of the first cooling pipe and the second cooling pipe is attached to the radiating fin.

The internal insulation structure of the lithium ion power battery has the beneficial effects that the insulation partition plate is positioned between the battery packs of the lithium ion power battery, and the heat generated by the battery packs is absorbed by the refrigerants in the first cooling pipe and the second cooling pipe, so that the internal temperature of the lithium ion power battery is conveniently accelerated to be reduced, the aging of the internal insulation structure of the lithium ion power battery is prevented from being accelerated by higher heat, and the heat conduction and heat dissipation performance of the internal insulation structure of the lithium ion power battery are improved.

Drawings

Fig. 1 is a schematic cross-sectional front view of an internal insulation structure of a lithium ion power battery according to an embodiment of the utility model.

Fig. 2 is a schematic cross-sectional front view of an insulating spacer according to an embodiment of the present utility model.

Fig. 3 is a schematic side sectional view of an insulating spacer according to an embodiment of the present utility model.

Fig. 4 is a perspective view of an insulating spacer according to an embodiment of the present utility model.

In the figure: 1. a power battery housing; 11. a tab; 12. a positive electrode battery; 13. a negative electrode battery; 2. an insulating separator; 21. a liquid filling port; 22. an insulating separator; 23. a heat sink; 3. a first cooling tube; 31. a sealing plug; 32. a second cooling tube; 4. a heat absorption column; 41. a heat conducting layer; 42. an outer insulating layer.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific 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.

Referring to fig. 1 to 4, the present utility model provides an internal insulation structure of a lithium ion power battery, comprising: a power battery shell 1, a positive electrode battery pack 12 and a negative electrode battery pack 13 are arranged in the power battery shell 1,

an insulating partition plate 2 is fixed in the power battery shell 1 in a sealing way, three groups of heat absorption columns 4 are fixed on the inner side of the insulating partition plate 2, and a first cooling pipe 3 and a second cooling pipe 32 are wrapped in the heat absorption columns 4; and the second cooling pipes 32 are symmetrically distributed on the front side and the rear side of the first cooling pipe 3, and the lower end face of the insulating partition plate 2 is embedded and fixed with cooling fins 23.

Working principle: the heat absorption column 4 of the insulating partition plate 2 absorbs heat of the positive electrode battery pack 12 and the negative electrode battery pack 13, so that the temperature of the refrigerant of the first cooling pipe 3 and the second cooling pipe 32 rises after absorbing the heat, the temperature of the refrigerant is emitted outside through the cooling fin 23, the temperature of the refrigerant is reduced, the next heat absorption is carried out, the aging of the insulating structure inside the lithium ion power battery is avoided, and the heat conduction and heat dissipation performance of the insulating structure inside the lithium ion power battery are improved.

In the present embodiment, an insulating separator 2 is bonded between the positive electrode battery 12 and the negative electrode battery 13; and the positive battery 12 is a lithium iron phosphate material; the negative electrode battery 13 is a conductive graphite material.

As a preferred embodiment, the positive electrode battery pack 12 of the lithium iron phosphate material and the negative electrode battery pack 13 of the conductive graphite material provide the lithium ion power battery with advantages of high energy, high battery voltage, wide operating temperature range, long shelf life, and the like.

In the embodiment, the upper end surface of the insulating partition board 2 is provided with a liquid filling port 21; and the lower end of the liquid filling port 21 is communicated with the upper port of the first cooling pipe 3, and a sealing plug 31 is fixed in the liquid filling port 21 in a sealing way.

As a preferred embodiment, the refrigerant is filled into the first cooling pipe 3 and the second cooling pipe 32 through the filling opening 21, so that the reduction of the internal temperature of the lithium ion power battery is conveniently accelerated, and the aging of the internal insulation structure of the lithium ion power battery is prevented from being accelerated due to higher heat.

In the embodiment, two groups of lugs 11 are arranged at the upper end of the power battery shell 1; and the two groups of lugs 11 are respectively connected with the positive electrode battery pack 12 and the negative electrode battery pack 13.

As a preferred implementation manner, the two groups of lugs 11 are respectively positive and negative lugs, and are current contact points of the lithium ion power battery, so that the charging and discharging working processes of the lithium ion power battery are facilitated.

In this embodiment, the side surface of the insulating partition board 2 is connected with the heat absorption column 4 through the insulating diaphragm 22, the outer surface of the heat absorption column 4 is provided with an outer insulating layer 42, and the inner side of the outer insulating layer 42 is wrapped with a heat conducting layer 41.

As a preferred embodiment, the insulating separator 22 facilitates the circulation of ions in the lithium-ion power cell. The outer insulating layer 42 protects the first cooling tube 3 and the second cooling tube 32 inside by functioning as insulation.

In the present embodiment, the inside of the first cooling pipe 3 and the second cooling pipe 32 is filled with the refrigerant; and the outer surfaces of the walls of the first cooling pipe 3 and the second cooling pipe 32 are wrapped with a heat conducting layer 41.

As a preferred embodiment, the refrigerant can absorb heat from the outside, and can directly reduce the internal temperature of the lithium ion power battery. The heat conductive layer 41 facilitates conduction of external heat to the first cooling tube 3 and the second cooling tube 32.

In the present embodiment, the lower end of the first cooling pipe 3 is communicated with the second cooling pipe 32; and the communication part of the lower ends of the first cooling pipe 3 and the second cooling pipe 32 is attached to the cooling fin 23.

As a preferred embodiment, the heat sink 23 is attached to the lower end of the first cooling tube 3 and the lower end of the second cooling tube 32, so as to facilitate rapid heat dissipation of the heat of the first cooling tube 3 and the second cooling tube 32, and facilitate temperature reduction of the refrigerant in the first cooling tube 3 and the second cooling tube 32.

The internal insulation structure of the lithium ion power battery can effectively solve the problems of poor heat conduction and heat dissipation performance of an insulation layer, is convenient for accelerating the reduction of the internal temperature of the lithium ion power battery, avoids the higher acceleration of the aging of the internal insulation structure of the lithium ion power battery by heat, improves the heat conduction and heat dissipation performance of the internal insulation structure of the lithium ion power battery, and is suitable for the internal insulation structure of the lithium ion power battery.

Claims

1. An internal insulation structure of a lithium ion power battery, comprising: the power battery shell (1), the inside anodal group battery (12) and negative pole group battery (13) that are provided with of power battery shell (1), its characterized in that:

an insulating partition plate (2) is fixed in the power battery shell (1) in a sealing manner, three groups of heat absorption columns (4) are fixed on the inner side of the insulating partition plate (2), and a first cooling pipe (3) and a second cooling pipe (32) are wrapped in the heat absorption columns (4); and the second cooling pipes (32) are symmetrically distributed on the front side and the rear side of the first cooling pipe (3), and radiating fins (23) are embedded and fixed on the lower end face of the insulating partition plate (2).

2. The internal insulation structure of a lithium ion power battery according to claim 1, wherein an insulation separator (2) is attached between the positive electrode battery (12) and the negative electrode battery (13); the positive battery pack (12) is made of lithium iron phosphate material; the negative electrode battery pack (13) is made of conductive graphite material.

3. The internal insulation structure of the lithium ion power battery according to claim 1, wherein the upper end surface of the insulation separator (2) is provided with a liquid filling port (21); and the lower end of the liquid filling port (21) is communicated with the upper port of the first cooling pipe (3), and a sealing plug (31) is fixed in the liquid filling port (21) in a sealing way.

4. The lithium ion power battery internal insulation structure according to claim 1, wherein two groups of lugs (11) are arranged at the upper end of the power battery shell (1); and the two groups of lugs (11) are respectively connected with the positive electrode battery pack (12) and the negative electrode battery pack (13).

5. The internal insulation structure of a lithium ion power battery according to claim 1, wherein the side surface of the insulation partition board (2) is connected with the heat absorption column (4) through the insulation membrane (22), an outer insulation layer (42) is arranged on the outer surface of the heat absorption column (4), and a heat conduction layer (41) is wrapped on the inner side of the outer insulation layer (42).

6. The lithium ion power battery internal insulation structure according to claim 1, wherein the first cooling pipe (3) and the second cooling pipe (32) are internally filled with a refrigerant; and the outer surfaces of the tube walls of the first cooling tube (3) and the second cooling tube (32) are wrapped with a heat conducting layer (41).

7. The lithium ion power battery internal insulation structure according to claim 1, wherein the lower end of the first cooling pipe (3) is communicated with the second cooling pipe (32); and the communication part of the first cooling pipe (3) and the lower end of the second cooling pipe (32) is attached to the radiating fin (23).