Battery cell and cold plate directly integrated shell-free power battery system

Abstract

The invention discloses a battery cell and cold plate direct integration shell-free power battery system, and relates to the technical field of lithium ion batteries, the battery cell and cold plate direct integration shell-free power battery system comprises a metal frame body, an upper cover and a lower cover, the metal frame body is internally provided with a plurality of heat exchange net wings, a protective cover and a liquid cooling collection device, one side of each of the plurality of protective covers is fixedly connected with the plurality of heat exchange network wings, and the plurality of liquid cooling collection devices are fixedly connected with the plurality of protective covers. According to the technical scheme, the functions of the prior art are greatly improved, the vehicle power battery system with higher efficiency and higher energy density is provided, the poor temperature consistency and low space utilization rate of the system in the prior art are improved, meanwhile, the service life of the lithium ion battery is prolonged, and the experience feeling of a new energy automobile or a hovercar is improved; the invention provides a power battery system which is more bold and more innovative, so that the high-integration development of a battery system for a new energy automobile is promoted.

Description

Technical Field

[0001] The invention relates to lithium-ion battery technology, and in particular to a shell-less power battery system in which a battery cell and a cold plate are directly integrated. Background Art

[0002] Lithium-ion batteries, commonly known as rocking chair batteries, are a general term for batteries with lithium-ion embedded compounds as positive electrode materials. They are a type of secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. Lithium-ion batteries were first successfully developed by Sony Corporation of Japan in 1990. Lithium-ion batteries are composed of positive electrodes, negative electrodes, electrolytes and diaphragms, plus positive and negative leads, battery shells, safety devices, etc. During the charging and discharging process of lithium-ion batteries, Li+ is embedded and de-embedded between the two electrodes; during charging, Li+ is de-embedded from the positive electrode and embedded in the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; during discharge, the opposite is true. Mobile phones and laptops all use lithium-ion batteries, which are usually commonly referred to as lithium batteries. As a power source, lithium-ion batteries are widely used in new energy vehicle equipment, submarines, torpedoes and drones;

[0003] In order to ensure stable battery operation, the existing technology usually sets water cooling and reinforcement structures in the battery box to improve the heat dissipation effect and structural strength of the battery respectively. However, due to the design defects of traditional battery structures, while meeting the heat dissipation and structural strength requirements, the overall space utilization of the box is too low, which reduces the battery energy density and seriously affects the battery performance. For this reason, we propose a shell-free (NO-BOX) power battery system with direct integration of battery cells and cold plates. Summary of the invention

[0004] The object of the present invention is to provide a NO-BOX power battery system in which a battery cell and a cold plate are directly integrated, so as to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a NO-BOX power battery system with direct integration of battery cells and cold plates, comprising a metal frame, an upper cover and a lower cover, wherein a plurality of heat exchange mesh fins, a protective cover and a liquid cooling collection device are installed inside the metal frame, one side of the plurality of protective covers are respectively fixedly connected to the plurality of heat exchange mesh fins, the plurality of liquid cooling collection devices are respectively fixedly connected to the plurality of protective covers, and the plurality of heat exchange mesh fins, protective covers and liquid cooling collection devices form a plurality of lithium-ion battery cell placement areas.

[0006] Furthermore, lithium-ion battery cell installation boxes are respectively installed inside the plurality of lithium-ion battery cell placement areas, and lithium-ion battery cells are respectively fixedly installed in an array inside the plurality of lithium-ion battery cell installation boxes.

[0007] Furthermore, liquid cooling assembly device Tesla flow channel grooves are arranged in an array inside the plurality of liquid cooling assembly devices, and the flow channel mode of the liquid cooling assembly device Tesla flow channel grooves is Tesla flow channel, and the coolant does not reflux.

[0008] Furthermore, a plurality of first metal support members are fixedly connected to an array on one side of the liquid cooling assembly device, and a same second metal support member is fixedly connected to one side of the plurality of first metal support members.

[0009] Furthermore, a plurality of vehicle fixing holes are arranged in an array on the metal frame, and the upper cover and the lower cover are respectively installed on two sides of the metal frame.

[0010] Furthermore, a cold plate structural adhesive is adhered to one side of the lithium-ion battery cell, a blue film window is opened on the side of the lithium-ion battery cell, the window area is coated with UV insulation, and the cross section of the metal frame is a circular frame.

[0011] Furthermore, the plurality of heat exchange mesh wings are all metal sheets welded on the liquid cooling assembly device. Stainless steel is the most economical. Of course, it can also be aluminum, iron, copper or other materials with good heat conduction. It will adopt a high-performance, high-permeability room-temperature curing epoxy resin A, B two sets of glue to bond with the lithium-ion battery cell over a large area, which plays a role of temperature conduction and bonding. The upper cover and the lower cover are both formed of foam plastics, and are in positive and negative matching with the protrusions or depressions in the package. The lower cover can be made of metal and coated with a stone-proof coating. The lower cover and the lithium-ion battery cell surface are filled with a high-performance, high-permeability room-temperature curing epoxy resin A, B two sets of glue and fiberglass as fillings, which play a role of heat exchange prevention. At the same time, as a vehicle chassis component, it can prevent the battery cell from being damaged by sharp objects, but does not contact the battery cell surface.

[0012] Compared with the prior art, the present invention provides a NO-BOX power battery system with direct integration of battery cells and cold plates. The technical solution greatly improves the functions of the prior art, provides a vehicle power battery system with higher efficiency and higher energy density, improves the poor temperature consistency and low space utilization of the system in the prior art, while extending the life of lithium-ion batteries and improving the user experience of new energy vehicles or flying cars, and proposes a bolder and more innovative power battery system, which will also promote the high-integration development of battery systems for new energy vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0014] Figure 1 A schematic diagram of a first top-down stereoscopic structure provided by an embodiment of the present invention;

[0015] Figure 2 A second top-down perspective structural diagram provided by an embodiment of the present invention;

[0016] Figure 3 A schematic diagram of a top view of a three-dimensional structure of an overall assembly provided by an embodiment of the present invention;

[0017] Figure 4 A schematic top view of the three-dimensional structure of the heat exchange mesh fins, liquid cooling assembly and protective cover provided in an embodiment of the present invention;

[0018] Figure 5 A schematic diagram of a partial cross-sectional plan structure of a liquid cooling assembly device provided in an embodiment of the present invention;

[0019] Figure 6 A schematic diagram of the front plan structure of a liquid cooling assembly, a first metal support member and a second metal support member provided in an embodiment of the present invention.

[0020] Description of reference numerals:

[0021] 1. Metal frame; 2. Heat exchange mesh fins; 3. Lithium-ion battery cell installation box; 4. Lithium-ion battery cell; 5. Protective cover; 6. Liquid cooling assembly; 7. Vehicle fixing holes; 8. Upper cover; 9. Lower cover; 10. Tesla flow channel groove of liquid cooling assembly; 11. First metal support; 12. Second metal support; 13. Lithium-ion battery cell placement area. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0023] Example 1: Please refer to Figure 1-6 A NO-BOX power battery system with direct integration of battery cells and cold plates comprises a metal frame 1, an upper cover 8 and a lower cover 9. A plurality of heat exchange mesh wings 2, a protective cover 5 and a liquid cooling collection device 6 are installed inside the metal frame 1. One side of the plurality of protective covers 5 are respectively fixedly connected to the plurality of heat exchange mesh wings 2. The plurality of liquid cooling collection devices 6 are respectively fixedly connected to the plurality of protective covers 5. The plurality of heat exchange mesh wings 2, the protective covers 5 and the liquid cooling collection devices 6 form a plurality of lithium-ion battery cell placement areas 13. The heat exchange mesh wings 2 are made of steel and adhered with thermal conductive gel as a lateral system support. A graphene graphite original film is coated on the heat exchange mesh wings 2 to improve thermal conductivity.

[0024] In this embodiment, lithium-ion battery cell installation boxes 3 are respectively installed inside the plurality of lithium-ion battery cell placement areas 13 , and lithium-ion battery cells 4 are respectively fixedly installed in an array inside the plurality of lithium-ion battery cell installation boxes 3 .

[0025] In the present embodiment, liquid cooling assembly device Tesla flow channel grooves 10 are arranged in an array inside the plurality of liquid cooling assembly devices 6. The flow channel mode of the liquid cooling assembly device Tesla flow channel grooves 10 is Tesla flow channel, and the coolant does not flow back. The metal frame 1 functions to form a constraint, and the liquid cooling assembly device 6 and the lithium-ion battery cell 4 are attached as a structure to form a whole connected to the entire vehicle. When the upper and lower covers are not added, we can see from all sides that the upper and lower ends of the battery cell are exposed on the upper and lower sides of the metal frame. As for the upper and lower exposed dimensions, they are calculated through key calculation formulas to ensure its stress resistance and fatigue resistance for long-term use.

[0026] In this embodiment, a plurality of first metal support members 11 are fixedly connected to an array on one side of the liquid cooling assembly 6 , and a second metal support member 12 is fixedly connected to one side of the plurality of first metal support members 11 .

[0027] In this embodiment, a plurality of vehicle fixing holes 7 are arranged in an array on the metal frame 1 , and an upper cover 8 and a lower cover 9 are respectively installed on two sides of the metal frame 1 .

[0028] In this embodiment, one side of the lithium-ion battery cell 4 is adhered with cold plate structural adhesive, the side of the lithium-ion battery cell 4 has a blue film window, and the window area is coated with UV insulation (or the entire lithium-ion battery cell 4 is coated with UV insulation) to facilitate the reliability of adhesion, and the cross-section of the metal frame 1 is a U-shaped frame.

[0029] In this embodiment, multiple heat exchange mesh wings 2 are all metal sheets welded on the liquid cooling collection device 6. Stainless steel is the most economical. Of course, it can also be aluminum, iron, copper or other materials with good heat conduction. It will use a high-performance, high-permeability room-temperature curing epoxy resin A, B two sets of glue to bond with the lithium-ion battery cell 4 over a large area, which not only plays a role in temperature conduction, but also plays a role in bonding. The upper cover 8 and the lower cover 9 are both formed of foam plastics, and are in positive and negative matching with the protrusions or depressions in the package. The lower cover 9 can be made of metal and coated with a stone-proof coating. The lower cover 9 and the lithium-ion battery cell 4 are filled with a high-performance, high-permeability room-temperature curing epoxy resin A, B two sets of glue and fiberglass as fillings to prevent heat exchange. At the same time, as a vehicle chassis component, it can prevent sharp objects from damaging the battery cell, but does not contact the battery cell surface.

[0030] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A battery cell and cold plate directly integrated housing-less power battery system, comprising a metal frame (1), an upper cover (8) and a lower cover (9), characterized in that: A plurality of heat exchange mesh wings (2), a protective cover (5) and a liquid cooling assembly device (6) are installed inside the metal frame (1); one side of the plurality of protective covers (5) is respectively fixedly connected to the plurality of heat exchange mesh wings (2); the plurality of liquid cooling assembly devices (6) are respectively fixedly connected to the plurality of protective covers (5); and the plurality of heat exchange mesh wings (2), the protective cover (5) and the liquid cooling assembly device (6) form a plurality of lithium-ion battery cell placement areas (13).

2. The caseless power battery system with direct integration of battery cells and cold plates according to claim 1, characterized in that: A plurality of lithium ion battery cell placement areas (13) are each installed with a lithium ion battery cell installation box (3), and a plurality of lithium ion battery cell installation boxes (3) are each installed with lithium ion battery cells (4) fixedly mounted in an array.

3. The caseless power battery system with direct integration of battery cells and cold plates according to claim 1, characterized in that: Liquid cooling assembly device Tesla flow channel grooves (10) are arranged in an array inside the plurality of liquid cooling assembly devices (6). The flow channel mode of the liquid cooling assembly device Tesla flow channel grooves (10) is a Tesla flow channel, and the cooling liquid does not reflux.

4. The caseless power battery system with direct integration of battery cells and cold plates according to claim 1, characterized in that: A plurality of first metal support members (11) are fixedly connected to an array on one side of the liquid cooling collection device (6), and a second metal support member (12) is fixedly connected to one side of the plurality of first metal support members (11).

5. The caseless power battery system with direct integration of battery cells and cold plates according to claim 1, characterized in that: The metal frame (1) is provided with a plurality of vehicle fixing holes (7) in an array, and the upper cover (8) and the lower cover (9) are respectively installed on two sides of the metal frame (1).

6. The caseless power battery system with direct integration of battery cells and cold plates according to claim 2, characterized in that: One side of the lithium-ion battery cell (4) is adhered with cold plate structural adhesive, a blue film window is opened on the side of the lithium-ion battery cell (4), the window area is coated with UV insulation, and the cross section of the metal frame (1) is a circular frame.

7. The caseless power battery system with direct integration of battery cells and cold plates according to claim 1, characterized in that: The plurality of heat exchange mesh wings (2) are all made of thin metal sheets welded on the liquid cooling collection device (6); the upper cover (8) and the lower cover (9) are both formed of foam plastics and are in positive and negative cooperation with the protrusions or depressions in the package; the lower cover (9) can be made of metal and coated with an anti-stone chip coating.

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